Initial public commit.

mDNS and SDP are functional. Otherwise, library is still very much
a work in progress. All tests pass.

43 files changed, 7758 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c16e3b2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,34 @@
+.deps/
+.libs/
+autom4te.cache/
+doxygen/
+*.dirstamp
+*.la
+*.lo
+*.o
+*.swp
+Makefile
+Makefile.in
+aclocal.m4
+ar-lib
+compile
+config.guess
+config.h.in
+config.h.in~
+config.h
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-h1
+
+tests/*_test
+tests/*.trs
+tests/*.log
+test-driver
+test-suite.log
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..62e02f6
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1 @@
+liburtc is written and maintained by Chris Hiszpanski <chris@hiszpanski.name>.
diff --git a/Doxyfile b/Doxyfile
new file mode 100644
index 0000000..e43743f
--- /dev/null
+++ b/Doxyfile
@@ -0,0 +1,2426 @@
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+# The default value is: YES.
+
+SORT_MEMBER_DOCS       = YES
+
+# If the SORT_BRIEF_DOCS tag is set to YES then doxygen will sort the brief
+# descriptions of file, namespace and class members alphabetically by member
+# name. If set to NO, the members will appear in declaration order. Note that
+# this will also influence the order of the classes in the class list.
+# The default value is: NO.
+
+SORT_BRIEF_DOCS        = NO
+
+# If the SORT_MEMBERS_CTORS_1ST tag is set to YES then doxygen will sort the
+# (brief and detailed) documentation of class members so that constructors and
+# destructors are listed first. If set to NO the constructors will appear in the
+# respective orders defined by SORT_BRIEF_DOCS and SORT_MEMBER_DOCS.
+# Note: If SORT_BRIEF_DOCS is set to NO this option is ignored for sorting brief
+# member documentation.
+# Note: If SORT_MEMBER_DOCS is set to NO this option is ignored for sorting
+# detailed member documentation.
+# The default value is: NO.
+
+SORT_MEMBERS_CTORS_1ST = NO
+
+# If the SORT_GROUP_NAMES tag is set to YES then doxygen will sort the hierarchy
+# of group names into alphabetical order. If set to NO the group names will
+# appear in their defined order.
+# The default value is: NO.
+
+SORT_GROUP_NAMES       = NO
+
+# If the SORT_BY_SCOPE_NAME tag is set to YES, the class list will be sorted by
+# fully-qualified names, including namespaces. If set to NO, the class list will
+# be sorted only by class name, not including the namespace part.
+# Note: This option is not very useful if HIDE_SCOPE_NAMES is set to YES.
+# Note: This option applies only to the class list, not to the alphabetical
+# list.
+# The default value is: NO.
+
+SORT_BY_SCOPE_NAME     = NO
+
+# If the STRICT_PROTO_MATCHING option is enabled and doxygen fails to do proper
+# type resolution of all parameters of a function it will reject a match between
+# the prototype and the implementation of a member function even if there is
+# only one candidate or it is obvious which candidate to choose by doing a
+# simple string match. By disabling STRICT_PROTO_MATCHING doxygen will still
+# accept a match between prototype and implementation in such cases.
+# The default value is: NO.
+
+STRICT_PROTO_MATCHING  = NO
+
+# The GENERATE_TODOLIST tag can be used to enable (YES) or disable (NO) the todo
+# list. This list is created by putting \todo commands in the documentation.
+# The default value is: YES.
+
+GENERATE_TODOLIST      = YES
+
+# The GENERATE_TESTLIST tag can be used to enable (YES) or disable (NO) the test
+# list. This list is created by putting \test commands in the documentation.
+# The default value is: YES.
+
+GENERATE_TESTLIST      = YES
+
+# The GENERATE_BUGLIST tag can be used to enable (YES) or disable (NO) the bug
+# list. This list is created by putting \bug commands in the documentation.
+# The default value is: YES.
+
+GENERATE_BUGLIST       = YES
+
+# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or disable (NO)
+# the deprecated list. This list is created by putting \deprecated commands in
+# the documentation.
+# The default value is: YES.
+
+GENERATE_DEPRECATEDLIST= YES
+
+# The ENABLED_SECTIONS tag can be used to enable conditional documentation
+# sections, marked by \if <section_label> ... \endif and \cond <section_label>
+# ... \endcond blocks.
+
+ENABLED_SECTIONS       =
+
+# The MAX_INITIALIZER_LINES tag determines the maximum number of lines that the
+# initial value of a variable or macro / define can have for it to appear in the
+# documentation. If the initializer consists of more lines than specified here
+# it will be hidden. Use a value of 0 to hide initializers completely. The
+# appearance of the value of individual variables and macros / defines can be
+# controlled using \showinitializer or \hideinitializer command in the
+# documentation regardless of this setting.
+# Minimum value: 0, maximum value: 10000, default value: 30.
+
+MAX_INITIALIZER_LINES  = 30
+
+# Set the SHOW_USED_FILES tag to NO to disable the list of files generated at
+# the bottom of the documentation of classes and structs. If set to YES, the
+# list will mention the files that were used to generate the documentation.
+# The default value is: YES.
+
+SHOW_USED_FILES        = YES
+
+# Set the SHOW_FILES tag to NO to disable the generation of the Files page. This
+# will remove the Files entry from the Quick Index and from the Folder Tree View
+# (if specified).
+# The default value is: YES.
+
+SHOW_FILES             = YES
+
+# Set the SHOW_NAMESPACES tag to NO to disable the generation of the Namespaces
+# page. This will remove the Namespaces entry from the Quick Index and from the
+# Folder Tree View (if specified).
+# The default value is: YES.
+
+SHOW_NAMESPACES        = YES
+
+# The FILE_VERSION_FILTER tag can be used to specify a program or script that
+# doxygen should invoke to get the current version for each file (typically from
+# the version control system). Doxygen will invoke the program by executing (via
+# popen()) the command command input-file, where command is the value of the
+# FILE_VERSION_FILTER tag, and input-file is the name of an input file provided
+# by doxygen. Whatever the program writes to standard output is used as the file
+# version. For an example see the documentation.
+
+FILE_VERSION_FILTER    =
+
+# The LAYOUT_FILE tag can be used to specify a layout file which will be parsed
+# by doxygen. The layout file controls the global structure of the generated
+# output files in an output format independent way. To create the layout file
+# that represents doxygen's defaults, run doxygen with the -l option. You can
+# optionally specify a file name after the option, if omitted DoxygenLayout.xml
+# will be used as the name of the layout file.
+#
+# Note that if you run doxygen from a directory containing a file called
+# DoxygenLayout.xml, doxygen will parse it automatically even if the LAYOUT_FILE
+# tag is left empty.
+
+LAYOUT_FILE            =
+
+# The CITE_BIB_FILES tag can be used to specify one or more bib files containing
+# the reference definitions. This must be a list of .bib files. The .bib
+# extension is automatically appended if omitted. This requires the bibtex tool
+# to be installed. See also http://en.wikipedia.org/wiki/BibTeX for more info.
+# For LaTeX the style of the bibliography can be controlled using
+# LATEX_BIB_STYLE. To use this feature you need bibtex and perl available in the
+# search path. See also \cite for info how to create references.
+
+CITE_BIB_FILES         =
+
+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+
+# The QUIET tag can be used to turn on/off the messages that are generated to
+# standard output by doxygen. If QUIET is set to YES this implies that the
+# messages are off.
+# The default value is: NO.
+
+QUIET                  = YES
+
+# The WARNINGS tag can be used to turn on/off the warning messages that are
+# generated to standard error (stderr) by doxygen. If WARNINGS is set to YES
+# this implies that the warnings are on.
+#
+# Tip: Turn warnings on while writing the documentation.
+# The default value is: YES.
+
+WARNINGS               = YES
+
+# If the WARN_IF_UNDOCUMENTED tag is set to YES then doxygen will generate
+# warnings for undocumented members. If EXTRACT_ALL is set to YES then this flag
+# will automatically be disabled.
+# The default value is: YES.
+
+WARN_IF_UNDOCUMENTED   = YES
+
+# If the WARN_IF_DOC_ERROR tag is set to YES, doxygen will generate warnings for
+# potential errors in the documentation, such as not documenting some parameters
+# in a documented function, or documenting parameters that don't exist or using
+# markup commands wrongly.
+# The default value is: YES.
+
+WARN_IF_DOC_ERROR      = YES
+
+# This WARN_NO_PARAMDOC option can be enabled to get warnings for functions that
+# are documented, but have no documentation for their parameters or return
+# value. If set to NO, doxygen will only warn about wrong or incomplete
+# parameter documentation, but not about the absence of documentation.
+# The default value is: NO.
+
+WARN_NO_PARAMDOC       = NO
+
+# If the WARN_AS_ERROR tag is set to YES then doxygen will immediately stop when
+# a warning is encountered.
+# The default value is: NO.
+
+WARN_AS_ERROR          = NO
+
+# The WARN_FORMAT tag determines the format of the warning messages that doxygen
+# can produce. The string should contain the $file, $line, and $text tags, which
+# will be replaced by the file and line number from which the warning originated
+# and the warning text. Optionally the format may contain $version, which will
+# be replaced by the version of the file (if it could be obtained via
+# FILE_VERSION_FILTER)
+# The default value is: $file:$line: $text.
+
+WARN_FORMAT            = "$file:$line: $text"
+
+# The WARN_LOGFILE tag can be used to specify a file to which warning and error
+# messages should be written. If left blank the output is written to standard
+# error (stderr).
+
+WARN_LOGFILE           =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
+
+# The INPUT tag is used to specify the files and/or directories that contain
+# documented source files. You may enter file names like myfile.cpp or
+# directories like /usr/src/myproject. Separate the files or directories with
+# spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
+# Note: If this tag is empty the current directory is searched.
+
+INPUT                  = src/urtc.h
+
+# This tag can be used to specify the character encoding of the source files
+# that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
+# libiconv (or the iconv built into libc) for the transcoding. See the libiconv
+# documentation (see: http://www.gnu.org/software/libiconv) for the list of
+# possible encodings.
+# The default value is: UTF-8.
+
+INPUT_ENCODING         = UTF-8
+
+# If the value of the INPUT tag contains directories, you can use the
+# FILE_PATTERNS tag to specify one or more wildcard patterns (like *.cpp and
+# *.h) to filter out the source-files in the directories.
+#
+# Note that for custom extensions or not directly supported extensions you also
+# need to set EXTENSION_MAPPING for the extension otherwise the files are not
+# read by doxygen.
+#
+# If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cpp,
+# *.c++, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl, *.idl, *.ddl, *.odl, *.h,
+# *.hh, *.hxx, *.hpp, *.h++, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, *.inc,
+# *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
+# *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf and *.qsf.
+
+FILE_PATTERNS          = *.c \
+                         *.h \
+
+# The RECURSIVE tag can be used to specify whether or not subdirectories should
+# be searched for input files as well.
+# The default value is: NO.
+
+RECURSIVE              = YES
+
+# The EXCLUDE tag can be used to specify files and/or directories that should be
+# excluded from the INPUT source files. This way you can easily exclude a
+# subdirectory from a directory tree whose root is specified with the INPUT tag.
+#
+# Note that relative paths are relative to the directory from which doxygen is
+# run.
+
+EXCLUDE                =
+
+# The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
+# directories that are symbolic links (a Unix file system feature) are excluded
+# from the input.
+# The default value is: NO.
+
+EXCLUDE_SYMLINKS       = NO
+
+# If the value of the INPUT tag contains directories, you can use the
+# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude
+# certain files from those directories.
+#
+# Note that the wildcards are matched against the file with absolute path, so to
+# exclude all test directories for example use the pattern */test/*
+
+EXCLUDE_PATTERNS       =
+
+# The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
+# (namespaces, classes, functions, etc.) that should be excluded from the
+# output. The symbol name can be a fully qualified name, a word, or if the
+# wildcard * is used, a substring. Examples: ANamespace, AClass,
+# AClass::ANamespace, ANamespace::*Test
+#
+# Note that the wildcards are matched against the file with absolute path, so to
+# exclude all test directories use the pattern */test/*
+
+EXCLUDE_SYMBOLS        =
+
+# The EXAMPLE_PATH tag can be used to specify one or more files or directories
+# that contain example code fragments that are included (see the \include
+# command).
+
+EXAMPLE_PATH           = examples
+
+# If the value of the EXAMPLE_PATH tag contains directories, you can use the
+# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and
+# *.h) to filter out the source-files in the directories. If left blank all
+# files are included.
+
+EXAMPLE_PATTERNS       = *
+
+# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
+# searched for input files to be used with the \include or \dontinclude commands
+# irrespective of the value of the RECURSIVE tag.
+# The default value is: NO.
+
+EXAMPLE_RECURSIVE      = NO
+
+# The IMAGE_PATH tag can be used to specify one or more files or directories
+# that contain images that are to be included in the documentation (see the
+# \image command).
+
+IMAGE_PATH             =
+
+# The INPUT_FILTER tag can be used to specify a program that doxygen should
+# invoke to filter for each input file. Doxygen will invoke the filter program
+# by executing (via popen()) the command:
+#
+# <filter> <input-file>
+#
+# where <filter> is the value of the INPUT_FILTER tag, and <input-file> is the
+# name of an input file. Doxygen will then use the output that the filter
+# program writes to standard output. If FILTER_PATTERNS is specified, this tag
+# will be ignored.
+#
+# Note that the filter must not add or remove lines; it is applied before the
+# code is scanned, but not when the output code is generated. If lines are added
+# or removed, the anchors will not be placed correctly.
+#
+# Note that for custom extensions or not directly supported extensions you also
+# need to set EXTENSION_MAPPING for the extension otherwise the files are not
+# properly processed by doxygen.
+
+INPUT_FILTER           =
+
+# The FILTER_PATTERNS tag can be used to specify filters on a per file pattern
+# basis. Doxygen will compare the file name with each pattern and apply the
+# filter if there is a match. The filters are a list of the form: pattern=filter
+# (like *.cpp=my_cpp_filter). See INPUT_FILTER for further information on how
+# filters are used. If the FILTER_PATTERNS tag is empty or if none of the
+# patterns match the file name, INPUT_FILTER is applied.
+#
+# Note that for custom extensions or not directly supported extensions you also
+# need to set EXTENSION_MAPPING for the extension otherwise the files are not
+# properly processed by doxygen.
+
+FILTER_PATTERNS        =
+
+# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using
+# INPUT_FILTER) will also be used to filter the input files that are used for
+# producing the source files to browse (i.e. when SOURCE_BROWSER is set to YES).
+# The default value is: NO.
+
+FILTER_SOURCE_FILES    = NO
+
+# The FILTER_SOURCE_PATTERNS tag can be used to specify source filters per file
+# pattern. A pattern will override the setting for FILTER_PATTERN (if any) and
+# it is also possible to disable source filtering for a specific pattern using
+# *.ext= (so without naming a filter).
+# This tag requires that the tag FILTER_SOURCE_FILES is set to YES.
+
+FILTER_SOURCE_PATTERNS =
+
+# If the USE_MDFILE_AS_MAINPAGE tag refers to the name of a markdown file that
+# is part of the input, its contents will be placed on the main page
+# (index.html). This can be useful if you have a project on for instance GitHub
+# and want to reuse the introduction page also for the doxygen output.
+
+USE_MDFILE_AS_MAINPAGE =
+
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
+
+# If the SOURCE_BROWSER tag is set to YES then a list of source files will be
+# generated. Documented entities will be cross-referenced with these sources.
+#
+# Note: To get rid of all source code in the generated output, make sure that
+# also VERBATIM_HEADERS is set to NO.
+# The default value is: NO.
+
+SOURCE_BROWSER         = NO
+
+# Setting the INLINE_SOURCES tag to YES will include the body of functions,
+# classes and enums directly into the documentation.
+# The default value is: NO.
+
+INLINE_SOURCES         = NO
+
+# Setting the STRIP_CODE_COMMENTS tag to YES will instruct doxygen to hide any
+# special comment blocks from generated source code fragments. Normal C, C++ and
+# Fortran comments will always remain visible.
+# The default value is: YES.
+
+STRIP_CODE_COMMENTS    = YES
+
+# If the REFERENCED_BY_RELATION tag is set to YES then for each documented
+# function all documented functions referencing it will be listed.
+# The default value is: NO.
+
+REFERENCED_BY_RELATION = NO
+
+# If the REFERENCES_RELATION tag is set to YES then for each documented function
+# all documented entities called/used by that function will be listed.
+# The default value is: NO.
+
+REFERENCES_RELATION    = NO
+
+# If the REFERENCES_LINK_SOURCE tag is set to YES and SOURCE_BROWSER tag is set
+# to YES then the hyperlinks from functions in REFERENCES_RELATION and
+# REFERENCED_BY_RELATION lists will link to the source code. Otherwise they will
+# link to the documentation.
+# The default value is: YES.
+
+REFERENCES_LINK_SOURCE = YES
+
+# If SOURCE_TOOLTIPS is enabled (the default) then hovering a hyperlink in the
+# source code will show a tooltip with additional information such as prototype,
+# brief description and links to the definition and documentation. Since this
+# will make the HTML file larger and loading of large files a bit slower, you
+# can opt to disable this feature.
+# The default value is: YES.
+# This tag requires that the tag SOURCE_BROWSER is set to YES.
+
+SOURCE_TOOLTIPS        = YES
+
+# If the USE_HTAGS tag is set to YES then the references to source code will
+# point to the HTML generated by the htags(1) tool instead of doxygen built-in
+# source browser. The htags tool is part of GNU's global source tagging system
+# (see http://www.gnu.org/software/global/global.html). You will need version
+# 4.8.6 or higher.
+#
+# To use it do the following:
+# - Install the latest version of global
+# - Enable SOURCE_BROWSER and USE_HTAGS in the config file
+# - Make sure the INPUT points to the root of the source tree
+# - Run doxygen as normal
+#
+# Doxygen will invoke htags (and that will in turn invoke gtags), so these
+# tools must be available from the command line (i.e. in the search path).
+#
+# The result: instead of the source browser generated by doxygen, the links to
+# source code will now point to the output of htags.
+# The default value is: NO.
+# This tag requires that the tag SOURCE_BROWSER is set to YES.
+
+USE_HTAGS              = NO
+
+# If the VERBATIM_HEADERS tag is set the YES then doxygen will generate a
+# verbatim copy of the header file for each class for which an include is
+# specified. Set to NO to disable this.
+# See also: Section \class.
+# The default value is: YES.
+
+VERBATIM_HEADERS       = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+
+# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index of all
+# compounds will be generated. Enable this if the project contains a lot of
+# classes, structs, unions or interfaces.
+# The default value is: YES.
+
+ALPHABETICAL_INDEX     = YES
+
+# The COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns in
+# which the alphabetical index list will be split.
+# Minimum value: 1, maximum value: 20, default value: 5.
+# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
+
+COLS_IN_ALPHA_INDEX    = 5
+
+# In case all classes in a project start with a common prefix, all classes will
+# be put under the same header in the alphabetical index. The IGNORE_PREFIX tag
+# can be used to specify a prefix (or a list of prefixes) that should be ignored
+# while generating the index headers.
+# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
+
+IGNORE_PREFIX          =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_HTML tag is set to YES, doxygen will generate HTML output
+# The default value is: YES.
+
+GENERATE_HTML          = YES
+
+# The HTML_OUTPUT tag is used to specify where the HTML docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: html.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_OUTPUT            = html
+
+# The HTML_FILE_EXTENSION tag can be used to specify the file extension for each
+# generated HTML page (for example: .htm, .php, .asp).
+# The default value is: .html.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FILE_EXTENSION    = .html
+
+# The HTML_HEADER tag can be used to specify a user-defined HTML header file for
+# each generated HTML page. If the tag is left blank doxygen will generate a
+# standard header.
+#
+# To get valid HTML the header file that includes any scripts and style sheets
+# that doxygen needs, which is dependent on the configuration options used (e.g.
+# the setting GENERATE_TREEVIEW). It is highly recommended to start with a
+# default header using
+# doxygen -w html new_header.html new_footer.html new_stylesheet.css
+# YourConfigFile
+# and then modify the file new_header.html. See also section "Doxygen usage"
+# for information on how to generate the default header that doxygen normally
+# uses.
+# Note: The header is subject to change so you typically have to regenerate the
+# default header when upgrading to a newer version of doxygen. For a description
+# of the possible markers and block names see the documentation.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_HEADER            =
+
+# The HTML_FOOTER tag can be used to specify a user-defined HTML footer for each
+# generated HTML page. If the tag is left blank doxygen will generate a standard
+# footer. See HTML_HEADER for more information on how to generate a default
+# footer and what special commands can be used inside the footer. See also
+# section "Doxygen usage" for information on how to generate the default footer
+# that doxygen normally uses.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FOOTER            =
+
+# The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
+# sheet that is used by each HTML page. It can be used to fine-tune the look of
+# the HTML output. If left blank doxygen will generate a default style sheet.
+# See also section "Doxygen usage" for information on how to generate the style
+# sheet that doxygen normally uses.
+# Note: It is recommended to use HTML_EXTRA_STYLESHEET instead of this tag, as
+# it is more robust and this tag (HTML_STYLESHEET) will in the future become
+# obsolete.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_STYLESHEET        =
+
+# The HTML_EXTRA_STYLESHEET tag can be used to specify additional user-defined
+# cascading style sheets that are included after the standard style sheets
+# created by doxygen. Using this option one can overrule certain style aspects.
+# This is preferred over using HTML_STYLESHEET since it does not replace the
+# standard style sheet and is therefore more robust against future updates.
+# Doxygen will copy the style sheet files to the output directory.
+# Note: The order of the extra style sheet files is of importance (e.g. the last
+# style sheet in the list overrules the setting of the previous ones in the
+# list). For an example see the documentation.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_EXTRA_STYLESHEET  =
+
+# The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
+# other source files which should be copied to the HTML output directory. Note
+# that these files will be copied to the base HTML output directory. Use the
+# $relpath^ marker in the HTML_HEADER and/or HTML_FOOTER files to load these
+# files. In the HTML_STYLESHEET file, use the file name only. Also note that the
+# files will be copied as-is; there are no commands or markers available.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_EXTRA_FILES       =
+
+# The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen
+# will adjust the colors in the style sheet and background images according to
+# this color. Hue is specified as an angle on a colorwheel, see
+# http://en.wikipedia.org/wiki/Hue for more information. For instance the value
+# 0 represents red, 60 is yellow, 120 is green, 180 is cyan, 240 is blue, 300
+# purple, and 360 is red again.
+# Minimum value: 0, maximum value: 359, default value: 220.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_HUE    = 30
+
+# The HTML_COLORSTYLE_SAT tag controls the purity (or saturation) of the colors
+# in the HTML output. For a value of 0 the output will use grayscales only. A
+# value of 255 will produce the most vivid colors.
+# Minimum value: 0, maximum value: 255, default value: 100.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_SAT    = 150
+
+# The HTML_COLORSTYLE_GAMMA tag controls the gamma correction applied to the
+# luminance component of the colors in the HTML output. Values below 100
+# gradually make the output lighter, whereas values above 100 make the output
+# darker. The value divided by 100 is the actual gamma applied, so 80 represents
+# a gamma of 0.8, The value 220 represents a gamma of 2.2, and 100 does not
+# change the gamma.
+# Minimum value: 40, maximum value: 240, default value: 80.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_GAMMA  = 80
+
+# If the HTML_TIMESTAMP tag is set to YES then the footer of each generated HTML
+# page will contain the date and time when the page was generated. Setting this
+# to YES can help to show when doxygen was last run and thus if the
+# documentation is up to date.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_TIMESTAMP         = YES
+
+# If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML
+# documentation will contain sections that can be hidden and shown after the
+# page has loaded.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_DYNAMIC_SECTIONS  = NO
+
+# With HTML_INDEX_NUM_ENTRIES one can control the preferred number of entries
+# shown in the various tree structured indices initially; the user can expand
+# and collapse entries dynamically later on. Doxygen will expand the tree to
+# such a level that at most the specified number of entries are visible (unless
+# a fully collapsed tree already exceeds this amount). So setting the number of
+# entries 1 will produce a full collapsed tree by default. 0 is a special value
+# representing an infinite number of entries and will result in a full expanded
+# tree by default.
+# Minimum value: 0, maximum value: 9999, default value: 100.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_INDEX_NUM_ENTRIES = 100
+
+# If the GENERATE_DOCSET tag is set to YES, additional index files will be
+# generated that can be used as input for Apple's Xcode 3 integrated development
+# environment (see: http://developer.apple.com/tools/xcode/), introduced with
+# OSX 10.5 (Leopard). To create a documentation set, doxygen will generate a
+# Makefile in the HTML output directory. Running make will produce the docset in
+# that directory and running make install will install the docset in
+# ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find it at
+# startup. See http://developer.apple.com/tools/creatingdocsetswithdoxygen.html
+# for more information.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_DOCSET        = NO
+
+# This tag determines the name of the docset feed. A documentation feed provides
+# an umbrella under which multiple documentation sets from a single provider
+# (such as a company or product suite) can be grouped.
+# The default value is: Doxygen generated docs.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+
+# This tag specifies a string that should uniquely identify the documentation
+# set bundle. This should be a reverse domain-name style string, e.g.
+# com.mycompany.MyDocSet. Doxygen will append .docset to the name.
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_BUNDLE_ID       = org.liburtc
+
+# The DOCSET_PUBLISHER_ID tag specifies a string that should uniquely identify
+# the documentation publisher. This should be a reverse domain-name style
+# string, e.g. com.mycompany.MyDocSet.documentation.
+# The default value is: org.doxygen.Publisher.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_PUBLISHER_ID    = org.liburtc
+
+# The DOCSET_PUBLISHER_NAME tag identifies the documentation publisher.
+# The default value is: Publisher.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_PUBLISHER_NAME  = liburtc.org
+
+# If the GENERATE_HTMLHELP tag is set to YES then doxygen generates three
+# additional HTML index files: index.hhp, index.hhc, and index.hhk. The
+# index.hhp is a project file that can be read by Microsoft's HTML Help Workshop
+# (see: http://www.microsoft.com/en-us/download/details.aspx?id=21138) on
+# Windows.
+#
+# The HTML Help Workshop contains a compiler that can convert all HTML output
+# generated by doxygen into a single compiled HTML file (.chm). Compiled HTML
+# files are now used as the Windows 98 help format, and will replace the old
+# Windows help format (.hlp) on all Windows platforms in the future. Compressed
+# HTML files also contain an index, a table of contents, and you can search for
+# words in the documentation. The HTML workshop also contains a viewer for
+# compressed HTML files.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_HTMLHELP      = NO
+
+# The CHM_FILE tag can be used to specify the file name of the resulting .chm
+# file. You can add a path in front of the file if the result should not be
+# written to the html output directory.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+CHM_FILE               =
+
+# The HHC_LOCATION tag can be used to specify the location (absolute path
+# including file name) of the HTML help compiler (hhc.exe). If non-empty,
+# doxygen will try to run the HTML help compiler on the generated index.hhp.
+# The file has to be specified with full path.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+HHC_LOCATION           =
+
+# The GENERATE_CHI flag controls if a separate .chi index file is generated
+# (YES) or that it should be included in the master .chm file (NO).
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+GENERATE_CHI           = NO
+
+# The CHM_INDEX_ENCODING is used to encode HtmlHelp index (hhk), content (hhc)
+# and project file content.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+CHM_INDEX_ENCODING     =
+
+# The BINARY_TOC flag controls whether a binary table of contents is generated
+# (YES) or a normal table of contents (NO) in the .chm file. Furthermore it
+# enables the Previous and Next buttons.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+BINARY_TOC             = NO
+
+# The TOC_EXPAND flag can be set to YES to add extra items for group members to
+# the table of contents of the HTML help documentation and to the tree view.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+TOC_EXPAND             = NO
+
+# If the GENERATE_QHP tag is set to YES and both QHP_NAMESPACE and
+# QHP_VIRTUAL_FOLDER are set, an additional index file will be generated that
+# can be used as input for Qt's qhelpgenerator to generate a Qt Compressed Help
+# (.qch) of the generated HTML documentation.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_QHP           = NO
+
+# If the QHG_LOCATION tag is specified, the QCH_FILE tag can be used to specify
+# the file name of the resulting .qch file. The path specified is relative to
+# the HTML output folder.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QCH_FILE               =
+
+# The QHP_NAMESPACE tag specifies the namespace to use when generating Qt Help
+# Project output. For more information please see Qt Help Project / Namespace
+# (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#namespace).
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_NAMESPACE          = org.doxygen.Project
+
+# The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating Qt
+# Help Project output. For more information please see Qt Help Project / Virtual
+# Folders (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#virtual-
+# folders).
+# The default value is: doc.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_VIRTUAL_FOLDER     = doc
+
+# If the QHP_CUST_FILTER_NAME tag is set, it specifies the name of a custom
+# filter to add. For more information please see Qt Help Project / Custom
+# Filters (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-
+# filters).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_CUST_FILTER_NAME   =
+
+# The QHP_CUST_FILTER_ATTRS tag specifies the list of the attributes of the
+# custom filter to add. For more information please see Qt Help Project / Custom
+# Filters (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-
+# filters).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_CUST_FILTER_ATTRS  =
+
+# The QHP_SECT_FILTER_ATTRS tag specifies the list of the attributes this
+# project's filter section matches. Qt Help Project / Filter Attributes (see:
+# http://qt-project.org/doc/qt-4.8/qthelpproject.html#filter-attributes).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_SECT_FILTER_ATTRS  =
+
+# The QHG_LOCATION tag can be used to specify the location of Qt's
+# qhelpgenerator. If non-empty doxygen will try to run qhelpgenerator on the
+# generated .qhp file.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHG_LOCATION           =
+
+# If the GENERATE_ECLIPSEHELP tag is set to YES, additional index files will be
+# generated, together with the HTML files, they form an Eclipse help plugin. To
+# install this plugin and make it available under the help contents menu in
+# Eclipse, the contents of the directory containing the HTML and XML files needs
+# to be copied into the plugins directory of eclipse. The name of the directory
+# within the plugins directory should be the same as the ECLIPSE_DOC_ID value.
+# After copying Eclipse needs to be restarted before the help appears.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_ECLIPSEHELP   = NO
+
+# A unique identifier for the Eclipse help plugin. When installing the plugin
+# the directory name containing the HTML and XML files should also have this
+# name. Each documentation set should have its own identifier.
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_ECLIPSEHELP is set to YES.
+
+ECLIPSE_DOC_ID         = org.doxygen.Project
+
+# If you want full control over the layout of the generated HTML pages it might
+# be necessary to disable the index and replace it with your own. The
+# DISABLE_INDEX tag can be used to turn on/off the condensed index (tabs) at top
+# of each HTML page. A value of NO enables the index and the value YES disables
+# it. Since the tabs in the index contain the same information as the navigation
+# tree, you can set this option to YES if you also set GENERATE_TREEVIEW to YES.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+DISABLE_INDEX          = NO
+
+# The GENERATE_TREEVIEW tag is used to specify whether a tree-like index
+# structure should be generated to display hierarchical information. If the tag
+# value is set to YES, a side panel will be generated containing a tree-like
+# index structure (just like the one that is generated for HTML Help). For this
+# to work a browser that supports JavaScript, DHTML, CSS and frames is required
+# (i.e. any modern browser). Windows users are probably better off using the
+# HTML help feature. Via custom style sheets (see HTML_EXTRA_STYLESHEET) one can
+# further fine-tune the look of the index. As an example, the default style
+# sheet generated by doxygen has an example that shows how to put an image at
+# the root of the tree instead of the PROJECT_NAME. Since the tree basically has
+# the same information as the tab index, you could consider setting
+# DISABLE_INDEX to YES when enabling this option.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_TREEVIEW      = NO
+
+# The ENUM_VALUES_PER_LINE tag can be used to set the number of enum values that
+# doxygen will group on one line in the generated HTML documentation.
+#
+# Note that a value of 0 will completely suppress the enum values from appearing
+# in the overview section.
+# Minimum value: 0, maximum value: 20, default value: 4.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+ENUM_VALUES_PER_LINE   = 4
+
+# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be used
+# to set the initial width (in pixels) of the frame in which the tree is shown.
+# Minimum value: 0, maximum value: 1500, default value: 250.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+TREEVIEW_WIDTH         = 250
+
+# If the EXT_LINKS_IN_WINDOW option is set to YES, doxygen will open links to
+# external symbols imported via tag files in a separate window.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+EXT_LINKS_IN_WINDOW    = NO
+
+# Use this tag to change the font size of LaTeX formulas included as images in
+# the HTML documentation. When you change the font size after a successful
+# doxygen run you need to manually remove any form_*.png images from the HTML
+# output directory to force them to be regenerated.
+# Minimum value: 8, maximum value: 50, default value: 10.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+FORMULA_FONTSIZE       = 10
+
+# Use the FORMULA_TRANPARENT tag to determine whether or not the images
+# generated for formulas are transparent PNGs. Transparent PNGs are not
+# supported properly for IE 6.0, but are supported on all modern browsers.
+#
+# Note that when changing this option you need to delete any form_*.png files in
+# the HTML output directory before the changes have effect.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+FORMULA_TRANSPARENT    = YES
+
+# Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see
+# http://www.mathjax.org) which uses client side Javascript for the rendering
+# instead of using pre-rendered bitmaps. Use this if you do not have LaTeX
+# installed or if you want to formulas look prettier in the HTML output. When
+# enabled you may also need to install MathJax separately and configure the path
+# to it using the MATHJAX_RELPATH option.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+USE_MATHJAX            = NO
+
+# When MathJax is enabled you can set the default output format to be used for
+# the MathJax output. See the MathJax site (see:
+# http://docs.mathjax.org/en/latest/output.html) for more details.
+# Possible values are: HTML-CSS (which is slower, but has the best
+# compatibility), NativeMML (i.e. MathML) and SVG.
+# The default value is: HTML-CSS.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_FORMAT         = HTML-CSS
+
+# When MathJax is enabled you need to specify the location relative to the HTML
+# output directory using the MATHJAX_RELPATH option. The destination directory
+# should contain the MathJax.js script. For instance, if the mathjax directory
+# is located at the same level as the HTML output directory, then
+# MATHJAX_RELPATH should be ../mathjax. The default value points to the MathJax
+# Content Delivery Network so you can quickly see the result without installing
+# MathJax. However, it is strongly recommended to install a local copy of
+# MathJax from http://www.mathjax.org before deployment.
+# The default value is: http://cdn.mathjax.org/mathjax/latest.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+
+# The MATHJAX_EXTENSIONS tag can be used to specify one or more MathJax
+# extension names that should be enabled during MathJax rendering. For example
+# MATHJAX_EXTENSIONS = TeX/AMSmath TeX/AMSsymbols
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_EXTENSIONS     =
+
+# The MATHJAX_CODEFILE tag can be used to specify a file with javascript pieces
+# of code that will be used on startup of the MathJax code. See the MathJax site
+# (see: http://docs.mathjax.org/en/latest/output.html) for more details. For an
+# example see the documentation.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_CODEFILE       =
+
+# When the SEARCHENGINE tag is enabled doxygen will generate a search box for
+# the HTML output. The underlying search engine uses javascript and DHTML and
+# should work on any modern browser. Note that when using HTML help
+# (GENERATE_HTMLHELP), Qt help (GENERATE_QHP), or docsets (GENERATE_DOCSET)
+# there is already a search function so this one should typically be disabled.
+# For large projects the javascript based search engine can be slow, then
+# enabling SERVER_BASED_SEARCH may provide a better solution. It is possible to
+# search using the keyboard; to jump to the search box use <access key> + S
+# (what the <access key> is depends on the OS and browser, but it is typically
+# <CTRL>, <ALT>/<option>, or both). Inside the search box use the <cursor down
+# key> to jump into the search results window, the results can be navigated
+# using the <cursor keys>. Press <Enter> to select an item or <escape> to cancel
+# the search. The filter options can be selected when the cursor is inside the
+# search box by pressing <Shift>+<cursor down>. Also here use the <cursor keys>
+# to select a filter and <Enter> or <escape> to activate or cancel the filter
+# option.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+SEARCHENGINE           = YES
+
+# When the SERVER_BASED_SEARCH tag is enabled the search engine will be
+# implemented using a web server instead of a web client using Javascript. There
+# are two flavors of web server based searching depending on the EXTERNAL_SEARCH
+# setting. When disabled, doxygen will generate a PHP script for searching and
+# an index file used by the script. When EXTERNAL_SEARCH is enabled the indexing
+# and searching needs to be provided by external tools. See the section
+# "External Indexing and Searching" for details.
+# The default value is: NO.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SERVER_BASED_SEARCH    = NO
+
+# When EXTERNAL_SEARCH tag is enabled doxygen will no longer generate the PHP
+# script for searching. Instead the search results are written to an XML file
+# which needs to be processed by an external indexer. Doxygen will invoke an
+# external search engine pointed to by the SEARCHENGINE_URL option to obtain the
+# search results.
+#
+# Doxygen ships with an example indexer (doxyindexer) and search engine
+# (doxysearch.cgi) which are based on the open source search engine library
+# Xapian (see: http://xapian.org/).
+#
+# See the section "External Indexing and Searching" for details.
+# The default value is: NO.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTERNAL_SEARCH        = NO
+
+# The SEARCHENGINE_URL should point to a search engine hosted by a web server
+# which will return the search results when EXTERNAL_SEARCH is enabled.
+#
+# Doxygen ships with an example indexer (doxyindexer) and search engine
+# (doxysearch.cgi) which are based on the open source search engine library
+# Xapian (see: http://xapian.org/). See the section "External Indexing and
+# Searching" for details.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SEARCHENGINE_URL       =
+
+# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the unindexed
+# search data is written to a file for indexing by an external tool. With the
+# SEARCHDATA_FILE tag the name of this file can be specified.
+# The default file is: searchdata.xml.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SEARCHDATA_FILE        = searchdata.xml
+
+# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the
+# EXTERNAL_SEARCH_ID tag can be used as an identifier for the project. This is
+# useful in combination with EXTRA_SEARCH_MAPPINGS to search through multiple
+# projects and redirect the results back to the right project.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTERNAL_SEARCH_ID     =
+
+# The EXTRA_SEARCH_MAPPINGS tag can be used to enable searching through doxygen
+# projects other than the one defined by this configuration file, but that are
+# all added to the same external search index. Each project needs to have a
+# unique id set via EXTERNAL_SEARCH_ID. The search mapping then maps the id of
+# to a relative location where the documentation can be found. The format is:
+# EXTRA_SEARCH_MAPPINGS = tagname1=loc1 tagname2=loc2 ...
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTRA_SEARCH_MAPPINGS  =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
+# The default value is: YES.
+
+GENERATE_LATEX         = NO
+
+# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: latex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_OUTPUT           = latex
+
+# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be
+# invoked.
+#
+# Note that when enabling USE_PDFLATEX this option is only used for generating
+# bitmaps for formulas in the HTML output, but not in the Makefile that is
+# written to the output directory.
+# The default file is: latex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_CMD_NAME         = latex
+
+# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to generate
+# index for LaTeX.
+# The default file is: makeindex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+MAKEINDEX_CMD_NAME     = makeindex
+
+# If the COMPACT_LATEX tag is set to YES, doxygen generates more compact LaTeX
+# documents. This may be useful for small projects and may help to save some
+# trees in general.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+COMPACT_LATEX          = NO
+
+# The PAPER_TYPE tag can be used to set the paper type that is used by the
+# printer.
+# Possible values are: a4 (210 x 297 mm), letter (8.5 x 11 inches), legal (8.5 x
+# 14 inches) and executive (7.25 x 10.5 inches).
+# The default value is: a4.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+PAPER_TYPE             = a4
+
+# The EXTRA_PACKAGES tag can be used to specify one or more LaTeX package names
+# that should be included in the LaTeX output. The package can be specified just
+# by its name or with the correct syntax as to be used with the LaTeX
+# \usepackage command. To get the times font for instance you can specify :
+# EXTRA_PACKAGES=times or EXTRA_PACKAGES={times}
+# To use the option intlimits with the amsmath package you can specify:
+# EXTRA_PACKAGES=[intlimits]{amsmath}
+# If left blank no extra packages will be included.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+EXTRA_PACKAGES         =
+
+# The LATEX_HEADER tag can be used to specify a personal LaTeX header for the
+# generated LaTeX document. The header should contain everything until the first
+# chapter. If it is left blank doxygen will generate a standard header. See
+# section "Doxygen usage" for information on how to let doxygen write the
+# default header to a separate file.
+#
+# Note: Only use a user-defined header if you know what you are doing! The
+# following commands have a special meaning inside the header: $title,
+# $datetime, $date, $doxygenversion, $projectname, $projectnumber,
+# $projectbrief, $projectlogo. Doxygen will replace $title with the empty
+# string, for the replacement values of the other commands the user is referred
+# to HTML_HEADER.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_HEADER           =
+
+# The LATEX_FOOTER tag can be used to specify a personal LaTeX footer for the
+# generated LaTeX document. The footer should contain everything after the last
+# chapter. If it is left blank doxygen will generate a standard footer. See
+# LATEX_HEADER for more information on how to generate a default footer and what
+# special commands can be used inside the footer.
+#
+# Note: Only use a user-defined footer if you know what you are doing!
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_FOOTER           =
+
+# The LATEX_EXTRA_STYLESHEET tag can be used to specify additional user-defined
+# LaTeX style sheets that are included after the standard style sheets created
+# by doxygen. Using this option one can overrule certain style aspects. Doxygen
+# will copy the style sheet files to the output directory.
+# Note: The order of the extra style sheet files is of importance (e.g. the last
+# style sheet in the list overrules the setting of the previous ones in the
+# list).
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_EXTRA_STYLESHEET =
+
+# The LATEX_EXTRA_FILES tag can be used to specify one or more extra images or
+# other source files which should be copied to the LATEX_OUTPUT output
+# directory. Note that the files will be copied as-is; there are no commands or
+# markers available.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_EXTRA_FILES      =
+
+# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated is
+# prepared for conversion to PDF (using ps2pdf or pdflatex). The PDF file will
+# contain links (just like the HTML output) instead of page references. This
+# makes the output suitable for online browsing using a PDF viewer.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+PDF_HYPERLINKS         = YES
+
+# If the USE_PDFLATEX tag is set to YES, doxygen will use pdflatex to generate
+# the PDF file directly from the LaTeX files. Set this option to YES, to get a
+# higher quality PDF documentation.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+USE_PDFLATEX           = YES
+
+# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \batchmode
+# command to the generated LaTeX files. This will instruct LaTeX to keep running
+# if errors occur, instead of asking the user for help. This option is also used
+# when generating formulas in HTML.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_BATCHMODE        = NO
+
+# If the LATEX_HIDE_INDICES tag is set to YES then doxygen will not include the
+# index chapters (such as File Index, Compound Index, etc.) in the output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_HIDE_INDICES     = NO
+
+# If the LATEX_SOURCE_CODE tag is set to YES then doxygen will include source
+# code with syntax highlighting in the LaTeX output.
+#
+# Note that which sources are shown also depends on other settings such as
+# SOURCE_BROWSER.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_SOURCE_CODE      = NO
+
+# The LATEX_BIB_STYLE tag can be used to specify the style to use for the
+# bibliography, e.g. plainnat, or ieeetr. See
+# http://en.wikipedia.org/wiki/BibTeX and \cite for more info.
+# The default value is: plain.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_BIB_STYLE        = plain
+
+# If the LATEX_TIMESTAMP tag is set to YES then the footer of each generated
+# page will contain the date and time when the page was generated. Setting this
+# to NO can help when comparing the output of multiple runs.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_TIMESTAMP        = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_RTF tag is set to YES, doxygen will generate RTF output. The
+# RTF output is optimized for Word 97 and may not look too pretty with other RTF
+# readers/editors.
+# The default value is: NO.
+
+GENERATE_RTF           = NO
+
+# The RTF_OUTPUT tag is used to specify where the RTF docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: rtf.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_OUTPUT             = rtf
+
+# If the COMPACT_RTF tag is set to YES, doxygen generates more compact RTF
+# documents. This may be useful for small projects and may help to save some
+# trees in general.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+COMPACT_RTF            = NO
+
+# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated will
+# contain hyperlink fields. The RTF file will contain links (just like the HTML
+# output) instead of page references. This makes the output suitable for online
+# browsing using Word or some other Word compatible readers that support those
+# fields.
+#
+# Note: WordPad (write) and others do not support links.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_HYPERLINKS         = NO
+
+# Load stylesheet definitions from file. Syntax is similar to doxygen's config
+# file, i.e. a series of assignments. You only have to provide replacements,
+# missing definitions are set to their default value.
+#
+# See also section "Doxygen usage" for information on how to generate the
+# default style sheet that doxygen normally uses.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_STYLESHEET_FILE    =
+
+# Set optional variables used in the generation of an RTF document. Syntax is
+# similar to doxygen's config file. A template extensions file can be generated
+# using doxygen -e rtf extensionFile.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_EXTENSIONS_FILE    =
+
+# If the RTF_SOURCE_CODE tag is set to YES then doxygen will include source code
+# with syntax highlighting in the RTF output.
+#
+# Note that which sources are shown also depends on other settings such as
+# SOURCE_BROWSER.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_SOURCE_CODE        = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_MAN tag is set to YES, doxygen will generate man pages for
+# classes and files.
+# The default value is: NO.
+
+GENERATE_MAN           = NO
+
+# The MAN_OUTPUT tag is used to specify where the man pages will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it. A directory man3 will be created inside the directory specified by
+# MAN_OUTPUT.
+# The default directory is: man.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_OUTPUT             = man
+
+# The MAN_EXTENSION tag determines the extension that is added to the generated
+# man pages. In case the manual section does not start with a number, the number
+# 3 is prepended. The dot (.) at the beginning of the MAN_EXTENSION tag is
+# optional.
+# The default value is: .3.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_EXTENSION          = .3
+
+# The MAN_SUBDIR tag determines the name of the directory created within
+# MAN_OUTPUT in which the man pages are placed. If defaults to man followed by
+# MAN_EXTENSION with the initial . removed.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_SUBDIR             =
+
+# If the MAN_LINKS tag is set to YES and doxygen generates man output, then it
+# will generate one additional man file for each entity documented in the real
+# man page(s). These additional files only source the real man page, but without
+# them the man command would be unable to find the correct page.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_LINKS              = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_XML tag is set to YES, doxygen will generate an XML file that
+# captures the structure of the code including all documentation.
+# The default value is: NO.
+
+GENERATE_XML           = NO
+
+# The XML_OUTPUT tag is used to specify where the XML pages will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: xml.
+# This tag requires that the tag GENERATE_XML is set to YES.
+
+XML_OUTPUT             = xml
+
+# If the XML_PROGRAMLISTING tag is set to YES, doxygen will dump the program
+# listings (including syntax highlighting and cross-referencing information) to
+# the XML output. Note that enabling this will significantly increase the size
+# of the XML output.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_XML is set to YES.
+
+XML_PROGRAMLISTING     = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_DOCBOOK tag is set to YES, doxygen will generate Docbook files
+# that can be used to generate PDF.
+# The default value is: NO.
+
+GENERATE_DOCBOOK       = NO
+
+# The DOCBOOK_OUTPUT tag is used to specify where the Docbook pages will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be put in
+# front of it.
+# The default directory is: docbook.
+# This tag requires that the tag GENERATE_DOCBOOK is set to YES.
+
+DOCBOOK_OUTPUT         = docbook
+
+# If the DOCBOOK_PROGRAMLISTING tag is set to YES, doxygen will include the
+# program listings (including syntax highlighting and cross-referencing
+# information) to the DOCBOOK output. Note that enabling this will significantly
+# increase the size of the DOCBOOK output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_DOCBOOK is set to YES.
+
+DOCBOOK_PROGRAMLISTING = NO
+
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_AUTOGEN_DEF tag is set to YES, doxygen will generate an
+# AutoGen Definitions (see http://autogen.sf.net) file that captures the
+# structure of the code including all documentation. Note that this feature is
+# still experimental and incomplete at the moment.
+# The default value is: NO.
+
+GENERATE_AUTOGEN_DEF   = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_PERLMOD tag is set to YES, doxygen will generate a Perl module
+# file that captures the structure of the code including all documentation.
+#
+# Note that this feature is still experimental and incomplete at the moment.
+# The default value is: NO.
+
+GENERATE_PERLMOD       = NO
+
+# If the PERLMOD_LATEX tag is set to YES, doxygen will generate the necessary
+# Makefile rules, Perl scripts and LaTeX code to be able to generate PDF and DVI
+# output from the Perl module output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_LATEX          = NO
+
+# If the PERLMOD_PRETTY tag is set to YES, the Perl module output will be nicely
+# formatted so it can be parsed by a human reader. This is useful if you want to
+# understand what is going on. On the other hand, if this tag is set to NO, the
+# size of the Perl module output will be much smaller and Perl will parse it
+# just the same.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_PRETTY         = YES
+
+# The names of the make variables in the generated doxyrules.make file are
+# prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX. This is useful
+# so different doxyrules.make files included by the same Makefile don't
+# overwrite each other's variables.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_MAKEVAR_PREFIX =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+
+# If the ENABLE_PREPROCESSING tag is set to YES, doxygen will evaluate all
+# C-preprocessor directives found in the sources and include files.
+# The default value is: YES.
+
+ENABLE_PREPROCESSING   = YES
+
+# If the MACRO_EXPANSION tag is set to YES, doxygen will expand all macro names
+# in the source code. If set to NO, only conditional compilation will be
+# performed. Macro expansion can be done in a controlled way by setting
+# EXPAND_ONLY_PREDEF to YES.
+# The default value is: NO.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+MACRO_EXPANSION        = NO
+
+# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then
+# the macro expansion is limited to the macros specified with the PREDEFINED and
+# EXPAND_AS_DEFINED tags.
+# The default value is: NO.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+EXPAND_ONLY_PREDEF     = NO
+
+# If the SEARCH_INCLUDES tag is set to YES, the include files in the
+# INCLUDE_PATH will be searched if a #include is found.
+# The default value is: YES.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+SEARCH_INCLUDES        = YES
+
+# The INCLUDE_PATH tag can be used to specify one or more directories that
+# contain include files that are not input files but should be processed by the
+# preprocessor.
+# This tag requires that the tag SEARCH_INCLUDES is set to YES.
+
+INCLUDE_PATH           =
+
+# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
+# patterns (like *.h and *.hpp) to filter out the header-files in the
+# directories. If left blank, the patterns specified with FILE_PATTERNS will be
+# used.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+INCLUDE_FILE_PATTERNS  =
+
+# The PREDEFINED tag can be used to specify one or more macro names that are
+# defined before the preprocessor is started (similar to the -D option of e.g.
+# gcc). The argument of the tag is a list of macros of the form: name or
+# name=definition (no spaces). If the definition and the "=" are omitted, "=1"
+# is assumed. To prevent a macro definition from being undefined via #undef or
+# recursively expanded use the := operator instead of the = operator.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+PREDEFINED             =
+
+# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
+# tag can be used to specify a list of macro names that should be expanded. The
+# macro definition that is found in the sources will be used. Use the PREDEFINED
+# tag if you want to use a different macro definition that overrules the
+# definition found in the source code.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+EXPAND_AS_DEFINED      =
+
+# If the SKIP_FUNCTION_MACROS tag is set to YES then doxygen's preprocessor will
+# remove all references to function-like macros that are alone on a line, have
+# an all uppercase name, and do not end with a semicolon. Such function macros
+# are typically used for boiler-plate code, and will confuse the parser if not
+# removed.
+# The default value is: YES.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+SKIP_FUNCTION_MACROS   = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
+
+# The TAGFILES tag can be used to specify one or more tag files. For each tag
+# file the location of the external documentation should be added. The format of
+# a tag file without this location is as follows:
+# TAGFILES = file1 file2 ...
+# Adding location for the tag files is done as follows:
+# TAGFILES = file1=loc1 "file2 = loc2" ...
+# where loc1 and loc2 can be relative or absolute paths or URLs. See the
+# section "Linking to external documentation" for more information about the use
+# of tag files.
+# Note: Each tag file must have a unique name (where the name does NOT include
+# the path). If a tag file is not located in the directory in which doxygen is
+# run, you must also specify the path to the tagfile here.
+
+TAGFILES               =
+
+# When a file name is specified after GENERATE_TAGFILE, doxygen will create a
+# tag file that is based on the input files it reads. See section "Linking to
+# external documentation" for more information about the usage of tag files.
+
+GENERATE_TAGFILE       =
+
+# If the ALLEXTERNALS tag is set to YES, all external class will be listed in
+# the class index. If set to NO, only the inherited external classes will be
+# listed.
+# The default value is: NO.
+
+ALLEXTERNALS           = NO
+
+# If the EXTERNAL_GROUPS tag is set to YES, all external groups will be listed
+# in the modules index. If set to NO, only the current project's groups will be
+# listed.
+# The default value is: YES.
+
+EXTERNAL_GROUPS        = YES
+
+# If the EXTERNAL_PAGES tag is set to YES, all external pages will be listed in
+# the related pages index. If set to NO, only the current project's pages will
+# be listed.
+# The default value is: YES.
+
+EXTERNAL_PAGES         = YES
+
+# The PERL_PATH should be the absolute path and name of the perl script
+# interpreter (i.e. the result of 'which perl').
+# The default file (with absolute path) is: /usr/bin/perl.
+
+PERL_PATH              = /usr/bin/perl
+
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+
+# If the CLASS_DIAGRAMS tag is set to YES, doxygen will generate a class diagram
+# (in HTML and LaTeX) for classes with base or super classes. Setting the tag to
+# NO turns the diagrams off. Note that this option also works with HAVE_DOT
+# disabled, but it is recommended to install and use dot, since it yields more
+# powerful graphs.
+# The default value is: YES.
+
+CLASS_DIAGRAMS         = YES
+
+# You can define message sequence charts within doxygen comments using the \msc
+# command. Doxygen will then run the mscgen tool (see:
+# http://www.mcternan.me.uk/mscgen/)) to produce the chart and insert it in the
+# documentation. The MSCGEN_PATH tag allows you to specify the directory where
+# the mscgen tool resides. If left empty the tool is assumed to be found in the
+# default search path.
+
+MSCGEN_PATH            =
+
+# You can include diagrams made with dia in doxygen documentation. Doxygen will
+# then run dia to produce the diagram and insert it in the documentation. The
+# DIA_PATH tag allows you to specify the directory where the dia binary resides.
+# If left empty dia is assumed to be found in the default search path.
+
+DIA_PATH               =
+
+# If set to YES the inheritance and collaboration graphs will hide inheritance
+# and usage relations if the target is undocumented or is not a class.
+# The default value is: YES.
+
+HIDE_UNDOC_RELATIONS   = YES
+
+# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is
+# available from the path. This tool is part of Graphviz (see:
+# http://www.graphviz.org/), a graph visualization toolkit from AT&T and Lucent
+# Bell Labs. The other options in this section have no effect if this option is
+# set to NO
+# The default value is: NO.
+
+HAVE_DOT               = NO
+
+# The DOT_NUM_THREADS specifies the number of dot invocations doxygen is allowed
+# to run in parallel. When set to 0 doxygen will base this on the number of
+# processors available in the system. You can set it explicitly to a value
+# larger than 0 to get control over the balance between CPU load and processing
+# speed.
+# Minimum value: 0, maximum value: 32, default value: 0.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_NUM_THREADS        = 0
+
+# When you want a differently looking font in the dot files that doxygen
+# generates you can specify the font name using DOT_FONTNAME. You need to make
+# sure dot is able to find the font, which can be done by putting it in a
+# standard location or by setting the DOTFONTPATH environment variable or by
+# setting DOT_FONTPATH to the directory containing the font.
+# The default value is: Helvetica.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTNAME           = Helvetica
+
+# The DOT_FONTSIZE tag can be used to set the size (in points) of the font of
+# dot graphs.
+# Minimum value: 4, maximum value: 24, default value: 10.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTSIZE           = 10
+
+# By default doxygen will tell dot to use the default font as specified with
+# DOT_FONTNAME. If you specify a different font using DOT_FONTNAME you can set
+# the path where dot can find it using this tag.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTPATH           =
+
+# If the CLASS_GRAPH tag is set to YES then doxygen will generate a graph for
+# each documented class showing the direct and indirect inheritance relations.
+# Setting this tag to YES will force the CLASS_DIAGRAMS tag to NO.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CLASS_GRAPH            = YES
+
+# If the COLLABORATION_GRAPH tag is set to YES then doxygen will generate a
+# graph for each documented class showing the direct and indirect implementation
+# dependencies (inheritance, containment, and class references variables) of the
+# class with other documented classes.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+COLLABORATION_GRAPH    = YES
+
+# If the GROUP_GRAPHS tag is set to YES then doxygen will generate a graph for
+# groups, showing the direct groups dependencies.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GROUP_GRAPHS           = YES
+
+# If the UML_LOOK tag is set to YES, doxygen will generate inheritance and
+# collaboration diagrams in a style similar to the OMG's Unified Modeling
+# Language.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+UML_LOOK               = NO
+
+# If the UML_LOOK tag is enabled, the fields and methods are shown inside the
+# class node. If there are many fields or methods and many nodes the graph may
+# become too big to be useful. The UML_LIMIT_NUM_FIELDS threshold limits the
+# number of items for each type to make the size more manageable. Set this to 0
+# for no limit. Note that the threshold may be exceeded by 50% before the limit
+# is enforced. So when you set the threshold to 10, up to 15 fields may appear,
+# but if the number exceeds 15, the total amount of fields shown is limited to
+# 10.
+# Minimum value: 0, maximum value: 100, default value: 10.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+UML_LIMIT_NUM_FIELDS   = 10
+
+# If the TEMPLATE_RELATIONS tag is set to YES then the inheritance and
+# collaboration graphs will show the relations between templates and their
+# instances.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+TEMPLATE_RELATIONS     = NO
+
+# If the INCLUDE_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are set to
+# YES then doxygen will generate a graph for each documented file showing the
+# direct and indirect include dependencies of the file with other documented
+# files.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INCLUDE_GRAPH          = YES
+
+# If the INCLUDED_BY_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are
+# set to YES then doxygen will generate a graph for each documented file showing
+# the direct and indirect include dependencies of the file with other documented
+# files.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INCLUDED_BY_GRAPH      = YES
+
+# If the CALL_GRAPH tag is set to YES then doxygen will generate a call
+# dependency graph for every global function or class method.
+#
+# Note that enabling this option will significantly increase the time of a run.
+# So in most cases it will be better to enable call graphs for selected
+# functions only using the \callgraph command. Disabling a call graph can be
+# accomplished by means of the command \hidecallgraph.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CALL_GRAPH             = NO
+
+# If the CALLER_GRAPH tag is set to YES then doxygen will generate a caller
+# dependency graph for every global function or class method.
+#
+# Note that enabling this option will significantly increase the time of a run.
+# So in most cases it will be better to enable caller graphs for selected
+# functions only using the \callergraph command. Disabling a caller graph can be
+# accomplished by means of the command \hidecallergraph.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CALLER_GRAPH           = NO
+
+# If the GRAPHICAL_HIERARCHY tag is set to YES then doxygen will graphical
+# hierarchy of all classes instead of a textual one.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GRAPHICAL_HIERARCHY    = YES
+
+# If the DIRECTORY_GRAPH tag is set to YES then doxygen will show the
+# dependencies a directory has on other directories in a graphical way. The
+# dependency relations are determined by the #include relations between the
+# files in the directories.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DIRECTORY_GRAPH        = YES
+
+# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images
+# generated by dot. For an explanation of the image formats see the section
+# output formats in the documentation of the dot tool (Graphviz (see:
+# http://www.graphviz.org/)).
+# Note: If you choose svg you need to set HTML_FILE_EXTENSION to xhtml in order
+# to make the SVG files visible in IE 9+ (other browsers do not have this
+# requirement).
+# Possible values are: png, jpg, gif, svg, png:gd, png:gd:gd, png:cairo,
+# png:cairo:gd, png:cairo:cairo, png:cairo:gdiplus, png:gdiplus and
+# png:gdiplus:gdiplus.
+# The default value is: png.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_IMAGE_FORMAT       = png
+
+# If DOT_IMAGE_FORMAT is set to svg, then this option can be set to YES to
+# enable generation of interactive SVG images that allow zooming and panning.
+#
+# Note that this requires a modern browser other than Internet Explorer. Tested
+# and working are Firefox, Chrome, Safari, and Opera.
+# Note: For IE 9+ you need to set HTML_FILE_EXTENSION to xhtml in order to make
+# the SVG files visible. Older versions of IE do not have SVG support.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INTERACTIVE_SVG        = NO
+
+# The DOT_PATH tag can be used to specify the path where the dot tool can be
+# found. If left blank, it is assumed the dot tool can be found in the path.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_PATH               =
+
+# The DOTFILE_DIRS tag can be used to specify one or more directories that
+# contain dot files that are included in the documentation (see the \dotfile
+# command).
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOTFILE_DIRS           =
+
+# The MSCFILE_DIRS tag can be used to specify one or more directories that
+# contain msc files that are included in the documentation (see the \mscfile
+# command).
+
+MSCFILE_DIRS           =
+
+# The DIAFILE_DIRS tag can be used to specify one or more directories that
+# contain dia files that are included in the documentation (see the \diafile
+# command).
+
+DIAFILE_DIRS           =
+
+# When using plantuml, the PLANTUML_JAR_PATH tag should be used to specify the
+# path where java can find the plantuml.jar file. If left blank, it is assumed
+# PlantUML is not used or called during a preprocessing step. Doxygen will
+# generate a warning when it encounters a \startuml command in this case and
+# will not generate output for the diagram.
+
+PLANTUML_JAR_PATH      =
+
+# When using plantuml, the specified paths are searched for files specified by
+# the !include statement in a plantuml block.
+
+PLANTUML_INCLUDE_PATH  =
+
+# The DOT_GRAPH_MAX_NODES tag can be used to set the maximum number of nodes
+# that will be shown in the graph. If the number of nodes in a graph becomes
+# larger than this value, doxygen will truncate the graph, which is visualized
+# by representing a node as a red box. Note that doxygen if the number of direct
+# children of the root node in a graph is already larger than
+# DOT_GRAPH_MAX_NODES then the graph will not be shown at all. Also note that
+# the size of a graph can be further restricted by MAX_DOT_GRAPH_DEPTH.
+# Minimum value: 0, maximum value: 10000, default value: 50.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_GRAPH_MAX_NODES    = 50
+
+# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the graphs
+# generated by dot. A depth value of 3 means that only nodes reachable from the
+# root by following a path via at most 3 edges will be shown. Nodes that lay
+# further from the root node will be omitted. Note that setting this option to 1
+# or 2 may greatly reduce the computation time needed for large code bases. Also
+# note that the size of a graph can be further restricted by
+# DOT_GRAPH_MAX_NODES. Using a depth of 0 means no depth restriction.
+# Minimum value: 0, maximum value: 1000, default value: 0.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+MAX_DOT_GRAPH_DEPTH    = 0
+
+# Set the DOT_TRANSPARENT tag to YES to generate images with a transparent
+# background. This is disabled by default, because dot on Windows does not seem
+# to support this out of the box.
+#
+# Warning: Depending on the platform used, enabling this option may lead to
+# badly anti-aliased labels on the edges of a graph (i.e. they become hard to
+# read).
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_TRANSPARENT        = NO
+
+# Set the DOT_MULTI_TARGETS tag to YES to allow dot to generate multiple output
+# files in one run (i.e. multiple -o and -T options on the command line). This
+# makes dot run faster, but since only newer versions of dot (>1.8.10) support
+# this, this feature is disabled by default.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_MULTI_TARGETS      = NO
+
+# If the GENERATE_LEGEND tag is set to YES doxygen will generate a legend page
+# explaining the meaning of the various boxes and arrows in the dot generated
+# graphs.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GENERATE_LEGEND        = YES
+
+# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate dot
+# files that are used to generate the various graphs.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_CLEANUP            = YES
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..eff0eb0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright 2019-2021 Chris Hiszpanski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..e935715
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,5 @@
+# custom m4 macros within m4/ subdirectory
+ACLOCAL_AMFLAGS = -I m4 --install
+
+# library source, examples, and unit tests
+SUBDIRS = src examples tests
diff --git a/README b/README
new file mode 100644
index 0000000..3a0833e
--- /dev/null
+++ b/README
@@ -0,0 +1,109 @@
+liburtc
+=======
+
+Real-time communication for microcontrollers
+
+The WebRTC reference implementation was designed for web browsers, namely
+Chromium. It requires specialized build tools, over 10GB of disk space for
+source code, and produces a binary with a large footprint. liburtc, on the
+other hand, is designed with the following goals in mind:
+
+* Small footprint. Under 100KB.
+* Portable. Implemented in C (C99) and works on nearly any architecture and
+  POSIX.1-2001 compliant operating system.
+* Easy to use. Straight-forward to compile and integrate into your code.
+* Standards compliant. Adheres to IETF specs to ensure interoperability.
+* Minimal. Only implements subset of protocols required for basic functionality
+  for common embedded applications, such as smart cameras.
+* Minimal dependencies. Only dependency is OpenSSL.
+
+
+Bootstrapping
+-------------
+
+If checking out this code via `git`, run `autoconf` to generate a `configure`
+script.
+
+
+Quickstart
+----------
+
+To compile the library and usage example from source, you will need autoconf,
+automake, and libtool. Use `autogen.sh` to create a `configure` script for
+configuring and making the library:
+
+    ./autogen.sh && ./configure && make
+
+To test the library:
+
+    make check
+
+Next, see `example/README.md` for running a demo.
+
+
+Features
+--------
+
+- Autotools based build process
+- POSIX.1-2001 compliant implementation
+
+/ sdp
+/ stun client
+- ice agent (state machine)
+  - aes cbc encipher / decipher (openssl)
+- v4l2
+- libx264
+- libopus
+- dtls (openssl?)
+- srtp
+
+- ANSI C compliant implementation (C99)
+- BSD sockets (winsock not supported)
+
+- Session Description Protocol (SDP)
+  - SHA-256 certificate fingerprint
+
+- Interactive Connectivity Establishment (ICE) agent
+  - STUN: RFC 5389 compliant client (no server capability)
+  - TURN: RFC 5766 compliant client (no server capability)
+
+- DTLS-SRTP transport
+  - RFC 5764 compliant implementation (using OpenSSL)
+
+- Video codecs:
+  - H.264
+    - Profiles: baseline, constrained baseline, main, high
+    - Levels: 3.1 and up
+  - H.265 not supported (few, if any, browsers support this)
+  - VP8/9 not supported (few embedded devices support this)
+
+- Video sources:
+  - Video4Linux2
+  - USB Video Class
+
+- Audio codecs:
+  - G.711
+  - Opus
+
+- Audio sources:
+  - ALSA
+  - PulseAudio
+
+
+Possible Future Improvements
+----------------------------
+
+- seamless handoff between network interfaces (e.g. cellular and wifi)
+
+Notes
+-----
+
+- A thread is used per peer connection. Each thread asynchronously handles
+  i/o events.
+
+
+Credits
+-------
+
+- Diego Elio Petteno (https://autotools.io) for the wonderful resource on
+  autoconf, automake, libtool, and other tools in the autotools suite.
diff --git a/autogen.sh b/autogen.sh
new file mode 100755
index 0000000..9b6b39f
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+autoreconf -fiv
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..c6a74a3
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,23 @@
+AC_INIT([liburtc], [1.0.0], [chris@hiszpanski.name])
+
+# custom m4 macros within m4/ subdirectory
+AC_CONFIG_MACRO_DIR([m4])
+
+AM_INIT_AUTOMAKE([-Wall -Werror foreign no-dependencies subdir-objects])
+AC_PROG_CC
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_LIBOBJ_DIR([src])
+
+# for pthread support on linux
+AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
+
+AM_PROG_AR
+LT_INIT
+
+AC_CONFIG_FILES([
+	Makefile
+	examples/Makefile
+	src/Makefile
+	tests/Makefile
+])
+AC_OUTPUT
diff --git a/examples/.gitignore b/examples/.gitignore
new file mode 100644
index 0000000..b04600a
--- /dev/null
+++ b/examples/.gitignore
@@ -0,0 +1 @@
+sandbox
diff --git a/examples/Makefile.am b/examples/Makefile.am
new file mode 100644
index 0000000..f2e28b1
--- /dev/null
+++ b/examples/Makefile.am
@@ -0,0 +1,11 @@
+# Builds a minimal example program
+#bin_PROGRAMS    = example
+#example_CFLAGS  = -I$(top_srcdir)/src/include $(LWS_CFLAGS)
+#example_LDADD   = $(top_builddir)/src/liburtc.la $(LWS_LIBS)
+#example_SOURCES = server.c
+
+# Builds a minimal example program
+bin_PROGRAMS    = sandbox
+sandbox_CFLAGS  = -I$(top_srcdir)/src
+sandbox_LDADD   = $(top_builddir)/src/liburtc.la
+sandbox_SOURCES = sandbox.c
diff --git a/examples/sandbox.c b/examples/sandbox.c
new file mode 100644
index 0000000..2f3728d
--- /dev/null
+++ b/examples/sandbox.c
@@ -0,0 +1,33 @@
+#include <signal.h>
+#include <unistd.h>
+
+#include "mdns.h"
+#include "urtc.h"
+
+
+int main() {
+	sigset_t ss;
+	int signal;
+
+	const char *stun[] = {
+		"stun.l.google.com:19302",
+		"stun2.l.google.com:19302",
+		NULL
+	};
+
+	sigemptyset(&ss);
+	sigaddset(&ss, SIGINT);
+	sigaddset(&ss, SIGTERM);
+	sigaddset(&ss, SIGQUIT);
+
+	urtc_peerconn_t *pc = urtc_peerconn_create(stun);
+
+	// query for raspberry.local
+	mdns_query("raspberry");
+
+	sigwait(&ss, &signal);
+
+	urtc_peerconn_destroy(pc);
+
+	return 0;
+}
diff --git a/include/config.h b/include/config.h
new file mode 100644
index 0000000..a003218
--- /dev/null
+++ b/include/config.h
@@ -0,0 +1,46 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_CONFIG_H
+#define URTC_CONFIG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ice.h"
+
+/* Peer connection configuration */
+typedef struct urtc_config {
+	urtc_ice_server_t ice_servers[ICE_MAX_SERVERS];
+
+	// TODO video_source_t *vsrc;
+	// TODO video_sink_t   *vsnk;
+
+	// TODO audio_source_t *asrc;
+	// TODO audio_sink_t   *asnk;
+
+	// TODO data_source_t  *dsrc;
+	// TODO data_sink_t    *dsnk;
+} urtc_config_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_CONFIG_H */
diff --git a/include/ice.h b/include/ice.h
new file mode 100644
index 0000000..8b7251f
--- /dev/null
+++ b/include/ice.h
@@ -0,0 +1,129 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_ICE_H
+#define URTC_ICE_H
+
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <sys/select.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Maximum number of ICE bases. Each network interface address is a base. */
+#define	ICE_MAX_BASES	16
+
+/* Maximum number of supported ICE (i.e. STUN or TURN) servers */
+#define	ICE_MAX_SERVERS	16
+
+
+/////////////////////////////  TYPE DEFINITIONS  /////////////////////////////
+
+// STUN or TURN server
+typedef struct {
+	char *url;
+	char *username;						/* ignored for stun urls */
+	char *credential;					/* ignored for stun urls */
+} urtc_ice_server_t;
+
+// ICE base
+typedef struct {
+} ice_base_t;
+
+// ICE component
+typedef enum {
+	ICE_COMPONENT_NULL = 0,
+	ICE_COMPONENT_RTP,
+	ICE_COMPONENT_RTCP
+} ice_component_t;
+
+// ICE candidate
+typedef struct {
+	ice_component_t component;
+	uint16_t        port;
+	uint32_t        priority;
+} ice_candidate_t;
+
+typedef struct {
+	ice_candidate_t local;
+	ice_candidate_t remote;
+} ice_candidate_pair_t;
+
+// See https://tools.ietf.org/html/rfc8445#section-6.1.2.1
+typedef enum {
+	CHECKLIST_STATE_RUNNING = 0,
+	CHECKLIST_STATE_COMPLETED,
+	CHECKLIST_STATE_FAILED
+} ice_checklist_state_t;
+
+typedef struct {
+	ice_checklist_state_t state;
+} ice_checklist_t;
+
+// ICE agent object
+typedef struct {
+	pthread_t	    thread;
+	ice_checklist_t checklist;
+	ice_base_t      bases[ICE_MAX_BASES];
+
+	int nfds;
+	fd_set readfds;
+	fd_set writefds;
+	fd_set errorfds;
+
+	struct timeval	ta;
+
+	bool cancelled;
+} ice_agent_t;
+
+
+///////////////////////////  FORWARD DECLARATIONS  ///////////////////////////
+
+/**
+ * Create new ICE agent
+ *
+ * Each agent creates a separate thread for processing network i/o events.
+ *
+ * \param agent[out] Pointer to agent object pointer
+ *
+ * \return 0 on success. Negative on error.
+ */
+int ice_agent_create(ice_agent_t **agent);
+
+/**
+ * Destroy ICE agent
+ *
+ * Stops agent thread (if running) and frees memory.
+ *
+ * \param agent[in] Pointer to agent object
+ *
+ * \return 0 on success. Negative on error.
+ */
+int ice_agent_destroy(ice_agent_t *agent);
+
+int ice_gather_host_candidates();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_ICE_H */
diff --git a/include/peerconn.h b/include/peerconn.h
new file mode 100644
index 0000000..feecc0e
--- /dev/null
+++ b/include/peerconn.h
@@ -0,0 +1,140 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_PEERCONN_H
+#define URTC_PEERCONN_H
+
+#include "config.h"
+#include "ice.h"
+#include "sdp.h"
+#include "runloop.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/****************************  TYPE DEFINITIONS  ****************************/
+
+// Event callback function type. Takes and returns void pointers.
+typedef void *(*event_callback_t)(void *arg);
+
+// Peer connection
+typedef struct urtc_peerconn {
+	uint8_t n;
+
+	// Interactive connectivity establishment agent
+	ice_agent_t *agent;
+
+	// Local and remote session descriptions
+	urtc_sdp_t *ldesc;
+	urtc_sdp_t *rdesc;
+
+	// Event callbacks
+	void (*onIceCandidate)(const char *cand, void *arg);
+	void (*onIceGatheringStateChange)(int state);
+	void (*onIceConnectionStateChange)(int state);
+	void (*onSignalingStateChange)(int state);
+	void (*onTrack)(int track);
+
+	// Run loop for event handling
+	runloop_t runloop;
+} urtc_peerconn_t;
+
+
+/**************************  FORWARD DECLARATIONS  **************************/
+
+/**
+ * Create a new peer connection.
+ *
+ * \param pc[out] New peer connection.
+ * \param cfg[in] Peer connection configuration.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_create(urtc_peerconn_t **pc, const urtc_config_t *cfg);
+
+/**
+ * Adds received ICE candidate to ICE agent.
+ *
+ * If `cand` is a NULL pointer or empty string, it signals that all remote
+ * candidates have been delivered (i.e. end-of-candidates).
+ *
+ * \param pc[in] Peer connection.
+ * \param cand[in] ICE candidate.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_add_ice_candidate(urtc_peerconn_t *pc, const char *cand);
+
+/**
+ * Set remote description.
+ *
+ * \param pc[in] Peer connection.
+ * \param desc[in] Session description protocol string.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_set_remote_description(urtc_peerconn_t *pc, const char *desc);
+
+/**
+ * Set local description.
+ *
+ * \param pc[in] Peer connection.
+ * \param desc[in] Session description protocol string.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_set_local_description(urtc_peerconn_t *pc, const char *desc);
+
+/**
+ * Create offer.
+ *
+ * \param pc[in] Peer connection.
+ * \param offer[out] Session description to send to remote peer. Caller must
+ *     free.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_create_offer(urtc_peerconn_t *pc, char **offer);
+
+/**
+ * Create answer.
+ *
+ * \param pc[in] Peer connection
+ * \param answer[out] Session description to send to remote peer. Caller must
+ *     free.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_create_answer(urtc_peerconn_t *pc, char **answer);
+
+/**
+ * Teardown a peer connection.
+ *
+ * \param pc[in] Peer connection.
+ *
+ * \return 0 on success. Negative on error.
+ */
+int urtc_peerconn_destroy(urtc_peerconn_t *pc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_PEERCONN_H */
diff --git a/include/runloop.h b/include/runloop.h
new file mode 100644
index 0000000..ea840e7
--- /dev/null
+++ b/include/runloop.h
@@ -0,0 +1,111 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file runloop.h
+ * Event loop
+ * A more elaborate file description.
+ */
+
+#ifndef URTC_RUNLOOP_H
+#define URTC_RUNLOOP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+
+typedef void *(*callback_t)(int fd, void *arg);
+
+typedef struct {
+	// File descriptor sets for poll().
+	struct pollfd *fds;
+	nfds_t nfds;
+
+	// Callback array. Index into array is file descriptor.
+	callback_t *callbacks;
+	void **args;
+
+	// Pipe for aborting blocked poll(). Allows dynamic adds/removes.
+	int abortpipe[2];
+	bool done;
+
+	// Run loop thread ID
+	pthread_t tid;
+} runloop_t;
+
+/**
+ * Create a new run loop
+ *
+ * Each run loop creates a separate thread which then repeatedly poll()s
+ * for events. Upon receiving an event, the run loop calls the respective
+ * file descriptor's callback function.
+ *
+ * @param[out] rl  Pointer to run loop struct
+ */
+int urtc__runloop_create(runloop_t *rl);
+
+/**
+ * Add file descriptor to run loop
+ *
+ * @param rl      Run loop
+ * @param fd      File descriptor
+ * @param events  Events to monitor (see struct pollfd)
+ * @param cb      Callback to run on activity
+ * @param arg     User-specified argument to pass to callback
+ *
+ * @return Zero on success. Negative on error.
+ */
+int urtc__runloop_add(
+	runloop_t *rl,
+	int fd,
+	short events,
+	void *(*cb)(int fd, void *arg),
+	void *arg
+);
+
+/**
+ * Remove a file descriptor from the run loop. No more events will be
+ * processed for this file descriptor.
+ *
+ * @param rl Run loop.
+ * @param fd File descriptor.
+ *
+ * @return Zero on success. Negative on error.
+ */
+int urtc__runloop_remove(runloop_t *rl, int fd);
+
+int urtc__runloop_join(runloop_t *rl);
+
+/**
+ * Destroy a run loop
+ *
+ * @param rl Pointer to run loop object
+ *
+ * @return Zero on success; negative on error. On error, errno is set.
+ */
+int urtc__runloop_destroy(runloop_t *rl);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_RUNLOOP_H */
diff --git a/include/str.h b/include/str.h
new file mode 100644
index 0000000..f0164d3
--- /dev/null
+++ b/include/str.h
@@ -0,0 +1,34 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_STR_H
+#define URTC_STR_H
+
+#include <stddef.h>
+
+typedef struct {
+	char *string;
+	size_t length;
+	size_t capacity;
+} str_t;
+
+str_t str_create_empty(size_t capacity);
+str_t str_append(const str_t str, const char *c_str);
+void str_destroy(str_t s);
+
+#endif
diff --git a/include/stun.h b/include/stun.h
new file mode 100644
index 0000000..126e7f5
--- /dev/null
+++ b/include/stun.h
@@ -0,0 +1,134 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_STUN_H
+#define URTC_STUN_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SIZEOF_STUN_HDR				20
+
+// STUN Classes
+#define STUN_CLASS_REQUEST			0
+#define STUN_CLASS_INDICTATION		1
+#define STUN_CLASS_SUCCESS			2
+#define STUN_CLASS_ERROR			3
+
+// STUN Methods
+#define STUN_METHOD_RESERVED		0
+#define STUN_METHOD_BINDING			1
+
+
+/////////////////////////////  TYPE DEFINITIONS  /////////////////////////////
+
+typedef struct {
+	int rc;								// Retransmission count
+	int rto;							// Retransmission timeout (in ms)
+	int sockfd;							// Socket file descriptor
+} stun_client_t;
+
+typedef struct {
+	char *server;
+} stun_client_config_t;
+
+// STUN Message Header
+typedef struct __attribute__((__packed__)) {
+	uint16_t reserved:2;				// Upper two bits are 0
+	uint16_t type:14;					// 14-bit type
+	uint16_t msglen;					// Message length
+	uint32_t cookie;					// Magic cookie
+	uint8_t  txid[12];					// Transaction ID
+} stun_msg_hdr_t;
+
+// STUN Attribute
+typedef struct {
+	uint16_t type;						// Attribute type
+	uint16_t len;						// Value length, prior to padding
+	uint8_t *val;						// Pointer to attribute value
+} stun_attr_t;
+
+// STUN Attribute: MAPPED-ADDRESS
+typedef struct __attribute__((__packed__)) {
+	uint8_t reserved;
+	uint8_t family;
+	uint16_t port;
+	union {
+		uint8_t ipv4[4];				// IPv4 address is 32-bits
+		uint8_t ipv6[16];				// IPv6 address is 128-bits
+	};
+} stun_attr_mapped_address_t;
+
+// STUN Attribute: XOR-MAPPED-ADDRESS
+typedef stun_attr_mapped_address_t stun_attr_xor_mapped_address_t;
+
+// STUN Attribute: USERNAME
+
+
+//////////////////////////////////  MACROS  //////////////////////////////////
+
+// Get class from message header type
+#define CLASS(typ) (((typ >> 7) & 0x2) | ((typ >> 4) & 0x1))
+
+// Get method from message header type
+#define METHOD(typ) (((typ >> 2) & 0xF80) | ((typ >> 1) & 0x70) | (typ & 0xF))
+
+#define TYPE(cls, mthd) ( \
+		((mthd & 0xF80) << 2) | \
+		((cls & 0x2) << 7) | \
+		((mthd & 0x70) << 1) | \
+		((cls & 0x1) << 4) | \
+		(mthd & 0xF) \
+)
+
+
+///////////////////////////  FORWARD DECLARATIONS  ///////////////////////////
+
+/**
+ * (callback) Binding request response handler
+ *
+ * @param[in] name
+ * @param[in] arg  User argument
+ */
+typedef void (*stun_client_binding_response_callback)(
+	const char *name,
+	      void *arg
+);
+
+/**
+ * Sends a STUN binding request to the specified server
+ *
+ * @param[in] srv  Server (hostname or IP address)
+ * @param[in] cb   Handler to call when a response is received
+ * @param[in] arg  Optional user argument to pass to callback
+ */
+err_t stun_client_binding_request(
+	runloop_t *rl,
+	const char *srv,
+	stun_client_binding_response_callback cb,
+	void *arg
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_STUN_H */
diff --git a/include/urtc.h b/include/urtc.h
new file mode 100644
index 0000000..3eabba0
--- /dev/null
+++ b/include/urtc.h
@@ -0,0 +1,34 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_H
+#define URTC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "config.h"
+#include "err.h"
+#include "peerconn.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_H */
diff --git a/include/urtc/opts.h b/include/urtc/opts.h
new file mode 100644
index 0000000..7e5200b
--- /dev/null
+++ b/include/urtc/opts.h
@@ -0,0 +1,22 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_OPTS_H
+#define URTC_OPTS_H
+
+#endif /* URTC_OPTS_H */
diff --git a/m4/.gitignore b/m4/.gitignore
new file mode 100644
index 0000000..38066dd
--- /dev/null
+++ b/m4/.gitignore
@@ -0,0 +1,5 @@
+libtool.m4
+ltoptions.m4
+ltsugar.m4
+ltversion.m4
+lt~obsolete.m4
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
new file mode 100644
index 0000000..1598d07
--- /dev/null
+++ b/m4/ax_pthread.m4
@@ -0,0 +1,507 @@
+# ===========================================================================
+#        https://www.gnu.org/software/autoconf-archive/ax_pthread.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+#
+# DESCRIPTION
+#
+#   This macro figures out how to build C programs using POSIX threads. It
+#   sets the PTHREAD_LIBS output variable to the threads library and linker
+#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
+#   flags that are needed. (The user can also force certain compiler
+#   flags/libs to be tested by setting these environment variables.)
+#
+#   Also sets PTHREAD_CC to any special C compiler that is needed for
+#   multi-threaded programs (defaults to the value of CC otherwise). (This
+#   is necessary on AIX to use the special cc_r compiler alias.)
+#
+#   NOTE: You are assumed to not only compile your program with these flags,
+#   but also to link with them as well. For example, you might link with
+#   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
+#
+#   If you are only building threaded programs, you may wish to use these
+#   variables in your default LIBS, CFLAGS, and CC:
+#
+#     LIBS="$PTHREAD_LIBS $LIBS"
+#     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+#     CC="$PTHREAD_CC"
+#
+#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
+#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
+#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+#
+#   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
+#   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
+#   PTHREAD_CFLAGS.
+#
+#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
+#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
+#   is not found. If ACTION-IF-FOUND is not specified, the default action
+#   will define HAVE_PTHREAD.
+#
+#   Please let the authors know if this macro fails on any platform, or if
+#   you have any other suggestions or comments. This macro was based on work
+#   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
+#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
+#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
+#   grateful for the helpful feedback of numerous users.
+#
+#   Updated for Autoconf 2.68 by Daniel Richard G.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+#   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
+#   Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 27
+
+AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
+AC_DEFUN([AX_PTHREAD], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_CC])
+AC_REQUIRE([AC_PROG_SED])
+AC_LANG_PUSH([C])
+ax_pthread_ok=no
+
+# We used to check for pthread.h first, but this fails if pthread.h
+# requires special compiler flags (e.g. on Tru64 or Sequent).
+# It gets checked for in the link test anyway.
+
+# First of all, check if the user has set any of the PTHREAD_LIBS,
+# etcetera environment variables, and if threads linking works using
+# them:
+if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
+        ax_pthread_save_CC="$CC"
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
+        AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
+        AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
+        AC_MSG_RESULT([$ax_pthread_ok])
+        if test "x$ax_pthread_ok" = "xno"; then
+                PTHREAD_LIBS=""
+                PTHREAD_CFLAGS=""
+        fi
+        CC="$ax_pthread_save_CC"
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"
+fi
+
+# We must check for the threads library under a number of different
+# names; the ordering is very important because some systems
+# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
+# libraries is broken (non-POSIX).
+
+# Create a list of thread flags to try. Items with a "," contain both
+# C compiler flags (before ",") and linker flags (after ","). Other items
+# starting with a "-" are C compiler flags, and remaining items are
+# library names, except for "none" which indicates that we try without
+# any flags at all, and "pthread-config" which is a program returning
+# the flags for the Pth emulation library.
+
+ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+
+# The ordering *is* (sometimes) important.  Some notes on the
+# individual items follow:
+
+# pthreads: AIX (must check this before -lpthread)
+# none: in case threads are in libc; should be tried before -Kthread and
+#       other compiler flags to prevent continual compiler warnings
+# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
+#           (Note: HP C rejects this with "bad form for `-t' option")
+# -pthreads: Solaris/gcc (Note: HP C also rejects)
+# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
+#      doesn't hurt to check since this sometimes defines pthreads and
+#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
+#      is present but should not be used directly; and before -mthreads,
+#      because the compiler interprets this as "-mt" + "-hreads")
+# -mthreads: Mingw32/gcc, Lynx/gcc
+# pthread: Linux, etcetera
+# --thread-safe: KAI C++
+# pthread-config: use pthread-config program (for GNU Pth library)
+
+case $host_os in
+
+        freebsd*)
+
+        # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+        # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+
+        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
+        ;;
+
+        hpux*)
+
+        # From the cc(1) man page: "[-mt] Sets various -D flags to enable
+        # multi-threading and also sets -lpthread."
+
+        ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
+        ;;
+
+        openedition*)
+
+        # IBM z/OS requires a feature-test macro to be defined in order to
+        # enable POSIX threads at all, so give the user a hint if this is
+        # not set. (We don't define these ourselves, as they can affect
+        # other portions of the system API in unpredictable ways.)
+
+        AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
+            [
+#            if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
+             AX_PTHREAD_ZOS_MISSING
+#            endif
+            ],
+            [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
+        ;;
+
+        solaris*)
+
+        # On Solaris (at least, for some versions), libc contains stubbed
+        # (non-functional) versions of the pthreads routines, so link-based
+        # tests will erroneously succeed. (N.B.: The stubs are missing
+        # pthread_cleanup_push, or rather a function called by this macro,
+        # so we could check for that, but who knows whether they'll stub
+        # that too in a future libc.)  So we'll check first for the
+        # standard Solaris way of linking pthreads (-mt -lpthread).
+
+        ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
+        ;;
+esac
+
+# Are we compiling with Clang?
+
+AC_CACHE_CHECK([whether $CC is Clang],
+    [ax_cv_PTHREAD_CLANG],
+    [ax_cv_PTHREAD_CLANG=no
+     # Note that Autoconf sets GCC=yes for Clang as well as GCC
+     if test "x$GCC" = "xyes"; then
+        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
+            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
+#            if defined(__clang__) && defined(__llvm__)
+             AX_PTHREAD_CC_IS_CLANG
+#            endif
+            ],
+            [ax_cv_PTHREAD_CLANG=yes])
+     fi
+    ])
+ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
+
+
+# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
+
+# Note that for GCC and Clang -pthread generally implies -lpthread,
+# except when -nostdlib is passed.
+# This is problematic using libtool to build C++ shared libraries with pthread:
+# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
+# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
+# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
+# To solve this, first try -pthread together with -lpthread for GCC
+
+AS_IF([test "x$GCC" = "xyes"],
+      [ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
+
+# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
+
+AS_IF([test "x$ax_pthread_clang" = "xyes"],
+      [ax_pthread_flags="-pthread,-lpthread -pthread"])
+
+
+# The presence of a feature test macro requesting re-entrant function
+# definitions is, on some systems, a strong hint that pthreads support is
+# correctly enabled
+
+case $host_os in
+        darwin* | hpux* | linux* | osf* | solaris*)
+        ax_pthread_check_macro="_REENTRANT"
+        ;;
+
+        aix*)
+        ax_pthread_check_macro="_THREAD_SAFE"
+        ;;
+
+        *)
+        ax_pthread_check_macro="--"
+        ;;
+esac
+AS_IF([test "x$ax_pthread_check_macro" = "x--"],
+      [ax_pthread_check_cond=0],
+      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
+
+
+if test "x$ax_pthread_ok" = "xno"; then
+for ax_pthread_try_flag in $ax_pthread_flags; do
+
+        case $ax_pthread_try_flag in
+                none)
+                AC_MSG_CHECKING([whether pthreads work without any flags])
+                ;;
+
+                *,*)
+                PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
+                PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
+                AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
+                ;;
+
+                -*)
+                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
+                PTHREAD_CFLAGS="$ax_pthread_try_flag"
+                ;;
+
+                pthread-config)
+                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
+                AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
+                PTHREAD_CFLAGS="`pthread-config --cflags`"
+                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
+                ;;
+
+                *)
+                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
+                PTHREAD_LIBS="-l$ax_pthread_try_flag"
+                ;;
+        esac
+
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+
+        # Check for various functions.  We must include pthread.h,
+        # since some functions may be macros.  (On the Sequent, we
+        # need a special flag -Kthread to make this header compile.)
+        # We check for pthread_join because it is in -lpthread on IRIX
+        # while pthread_create is in libc.  We check for pthread_attr_init
+        # due to DEC craziness with -lpthreads.  We check for
+        # pthread_cleanup_push because it is one of the few pthread
+        # functions on Solaris that doesn't have a non-functional libc stub.
+        # We try pthread_create on general principles.
+
+        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
+#                       if $ax_pthread_check_cond
+#                        error "$ax_pthread_check_macro must be defined"
+#                       endif
+                        static void *some_global = NULL;
+                        static void routine(void *a)
+                          {
+                             /* To avoid any unused-parameter or
+                                unused-but-set-parameter warning.  */
+                             some_global = a;
+                          }
+                        static void *start_routine(void *a) { return a; }],
+                       [pthread_t th; pthread_attr_t attr;
+                        pthread_create(&th, 0, start_routine, 0);
+                        pthread_join(th, 0);
+                        pthread_attr_init(&attr);
+                        pthread_cleanup_push(routine, 0);
+                        pthread_cleanup_pop(0) /* ; */])],
+            [ax_pthread_ok=yes],
+            [])
+
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"
+
+        AC_MSG_RESULT([$ax_pthread_ok])
+        AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
+
+        PTHREAD_LIBS=""
+        PTHREAD_CFLAGS=""
+done
+fi
+
+
+# Clang needs special handling, because older versions handle the -pthread
+# option in a rather... idiosyncratic way
+
+if test "x$ax_pthread_clang" = "xyes"; then
+
+        # Clang takes -pthread; it has never supported any other flag
+
+        # (Note 1: This will need to be revisited if a system that Clang
+        # supports has POSIX threads in a separate library.  This tends not
+        # to be the way of modern systems, but it's conceivable.)
+
+        # (Note 2: On some systems, notably Darwin, -pthread is not needed
+        # to get POSIX threads support; the API is always present and
+        # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
+        # -pthread does define _REENTRANT, and while the Darwin headers
+        # ignore this macro, third-party headers might not.)
+
+        # However, older versions of Clang make a point of warning the user
+        # that, in an invocation where only linking and no compilation is
+        # taking place, the -pthread option has no effect ("argument unused
+        # during compilation").  They expect -pthread to be passed in only
+        # when source code is being compiled.
+        #
+        # Problem is, this is at odds with the way Automake and most other
+        # C build frameworks function, which is that the same flags used in
+        # compilation (CFLAGS) are also used in linking.  Many systems
+        # supported by AX_PTHREAD require exactly this for POSIX threads
+        # support, and in fact it is often not straightforward to specify a
+        # flag that is used only in the compilation phase and not in
+        # linking.  Such a scenario is extremely rare in practice.
+        #
+        # Even though use of the -pthread flag in linking would only print
+        # a warning, this can be a nuisance for well-run software projects
+        # that build with -Werror.  So if the active version of Clang has
+        # this misfeature, we search for an option to squash it.
+
+        AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
+             # Create an alternate version of $ac_link that compiles and
+             # links in two steps (.c -> .o, .o -> exe) instead of one
+             # (.c -> exe), because the warning occurs only in the second
+             # step
+             ax_pthread_save_ac_link="$ac_link"
+             ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
+             ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
+             ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
+             ax_pthread_save_CFLAGS="$CFLAGS"
+             for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
+                AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
+                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
+                ac_link="$ax_pthread_save_ac_link"
+                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+                    [ac_link="$ax_pthread_2step_ac_link"
+                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+                         [break])
+                    ])
+             done
+             ac_link="$ax_pthread_save_ac_link"
+             CFLAGS="$ax_pthread_save_CFLAGS"
+             AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
+             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
+            ])
+
+        case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
+                no | unknown) ;;
+                *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
+        esac
+
+fi # $ax_pthread_clang = yes
+
+
+
+# Various other checks:
+if test "x$ax_pthread_ok" = "xyes"; then
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+
+        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
+        AC_CACHE_CHECK([for joinable pthread attribute],
+            [ax_cv_PTHREAD_JOINABLE_ATTR],
+            [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
+             for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+                 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
+                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
+                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
+                                [])
+             done
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
+               test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
+               test "x$ax_pthread_joinable_attr_defined" != "xyes"],
+              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
+                                  [$ax_cv_PTHREAD_JOINABLE_ATTR],
+                                  [Define to necessary symbol if this constant
+                                   uses a non-standard name on your system.])
+               ax_pthread_joinable_attr_defined=yes
+              ])
+
+        AC_CACHE_CHECK([whether more special flags are required for pthreads],
+            [ax_cv_PTHREAD_SPECIAL_FLAGS],
+            [ax_cv_PTHREAD_SPECIAL_FLAGS=no
+             case $host_os in
+             solaris*)
+             ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
+             ;;
+             esac
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
+               test "x$ax_pthread_special_flags_added" != "xyes"],
+              [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
+               ax_pthread_special_flags_added=yes])
+
+        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
+            [ax_cv_PTHREAD_PRIO_INHERIT],
+            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
+                                             [[int i = PTHREAD_PRIO_INHERIT;
+                                               return i;]])],
+                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
+                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
+               test "x$ax_pthread_prio_inherit_defined" != "xyes"],
+              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
+               ax_pthread_prio_inherit_defined=yes
+              ])
+
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"
+
+        # More AIX lossage: compile with *_r variant
+        if test "x$GCC" != "xyes"; then
+            case $host_os in
+                aix*)
+                AS_CASE(["x/$CC"],
+                    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
+                    [#handle absolute path differently from PATH based program lookup
+                     AS_CASE(["x$CC"],
+                         [x/*],
+                         [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
+                         [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
+                ;;
+            esac
+        fi
+fi
+
+test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
+
+AC_SUBST([PTHREAD_LIBS])
+AC_SUBST([PTHREAD_CFLAGS])
+AC_SUBST([PTHREAD_CC])
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test "x$ax_pthread_ok" = "xyes"; then
+        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
+        :
+else
+        ax_pthread_ok=no
+        $2
+fi
+AC_LANG_POP
+])dnl AX_PTHREAD
diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..5855857
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,9 @@
+lib_LTLIBRARIES = liburtc.la
+liburtc_la_SOURCES = g711.c g711_tables.c mdns.c prng.c sdp.c urtc.c \
+						uuid.c
+include_HEADERS = err.h g711.h mdns.h prng.h sdp.h urtc.h uuid.h
+
+# for pthreads support on linux
+liburtc_la_CFLAGS  = $(PTHREAD_CFLAGS)
+liburtc_la_LDFLAGS = $(PTHREAD_LDFLAGS)
+liburtc_la_LIBADD  = $(PTHREAD_LIBS)
diff --git a/src/err.h b/src/err.h
new file mode 100644
index 0000000..cd7fd19
--- /dev/null
+++ b/src/err.h
@@ -0,0 +1,58 @@
+/*
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_ERR_H
+#define _URTC_ERR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum err {
+	URTC_SUCCESS = 0,
+
+	URTC_ERR,
+
+	URTC_ERR_BAD_ARGUMENT,
+	URTC_ERR_INSUFFICIENT_MEMORY,
+	URTC_ERR_MALFORMED,
+	URTC_ERR_NOT_IMPLEMENTED,
+
+	URTC_ERR_PEERCONN_MISSING_REMOTE_DESC,
+
+	URTC_ERR_SDP_MALFORMED,
+	URTC_ERR_SDP_MALFORMED_VERSION,
+	URTC_ERR_SDP_MALFORMED_ORIGIN,
+	URTC_ERR_SDP_MALFORMED_TIMING,
+	URTC_ERR_SDP_MALFORMED_MEDIA,
+	URTC_ERR_SDP_MALFORMED_ATTRIBUTE,
+	URTC_ERR_SDP_UNSUPPORTED_FINGERPRINT_ALGO,
+	URTC_ERR_SDP_UNSUPPORTED_MEDIA_PROTOCOL,
+	URTC_ERR_SDP_UNSUPPORTED_MEDIA_TYPE
+} err_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URTC_ERR_H */
diff --git a/src/g711.c b/src/g711.c
new file mode 100644
index 0000000..47114d6
--- /dev/null
+++ b/src/g711.c
@@ -0,0 +1,40 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include "g711.h"
+
+void g711_encode(uint8_t *dst, const int16_t *src, size_t n) {
+	int i;
+
+	for (i = 0; i < n; i++) {
+		dst[i] = pcm2ulaw[0x1FFF & (src[i] >> 3)];
+	}
+}
+
+void g711_decode(int16_t *dst, const uint8_t *src, size_t n) {
+	int i;
+
+	for (i = 0; i < n; i++) {
+		fprintf(stderr, "i = %i, src[i] = %i\n", i, src[i]);
+		fprintf(stderr, "ulaw2pcm[i] = %i\n", ulaw2pcm[0]);
+//		dst[i] = ulaw2pcm[src[i]] << 3;
+		dst[i] = 0;
+	}
+}
diff --git a/src/g711.h b/src/g711.h
new file mode 100644
index 0000000..b607734
--- /dev/null
+++ b/src/g711.h
@@ -0,0 +1,68 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef URTC_G711_H
+#define URTC_G711_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+
+extern const uint8_t pcm2ulaw[];
+extern const int16_t ulaw2pcm[];
+
+/**
+ * ITU-T G.711 compand a 16-bit signed PCM audio buffer. Buffer may contain
+ * multiple channels, in which case \a n must be the number of frames times
+ * the number of channels.
+ *
+ * Only the upper 13-bits are companded. The lowest 3-bits are discarded.
+ *
+ * \a dst must be allocated and point to at least (\a n / 2) bytes. \a dst
+ * and \a src may overlap.
+ * 
+ * @param dst Destination buffer
+ * @param src Signed 16-bit sample source buffer
+ * @param n   Number of samples (frames times channels)
+ */
+void g711_encode(uint8_t *dst, const int16_t *src, size_t n);
+
+/**
+ * ITU-T G.711 decompand to a 16-bit signed PCM audio buffer. Buffer may
+ * contain multiple channels, in which case \a n must be the number of frames
+ * times the number of channels.
+ *
+ * The decompanded samples are normalized to 16-bits (the lowest 3-bits will be
+ * zero).
+ *
+ * \a dst must NOT overlap with \a src.
+ *
+ * @param dst Destination buffer
+ * @param src Signed 16-bit sample source buffer
+ * @param n   Number of samples (frames times channels)
+ */
+void g711_decode(int16_t *dst, const uint8_t *src, size_t n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* URTC_G711_H */
diff --git a/src/g711_tables.c b/src/g711_tables.c
new file mode 100644
index 0000000..0690d1a
--- /dev/null
+++ b/src/g711_tables.c
@@ -0,0 +1,745 @@
+/*
+ * liburtc
+ * Copyright 2019 Chris Hiszpanski
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+
+#include "g711.h"
+
+/* Table for ITU-T G.711 mu-law companding from 16-bit signed PCM */
+const uint8_t pcm2ulaw[] = {
+	0xff, 0xfe, 0xfe, 0xfd, 0xfd, 0xfc, 0xfc, 0xfb, 0xfb, 0xfa, 0xfa, 0xf9,
+	0xf9, 0xf8, 0xf8, 0xf7, 0xf7, 0xf6, 0xf6, 0xf5, 0xf5, 0xf4, 0xf4, 0xf3,
+	0xf3, 0xf2, 0xf2, 0xf1, 0xf1, 0xf0, 0xf0, 0xef, 0xef, 0xef, 0xef, 0xee,
+	0xee, 0xee, 0xee, 0xed, 0xed, 0xed, 0xed, 0xec, 0xec, 0xec, 0xec, 0xeb,
+	0xeb, 0xeb, 0xeb, 0xea, 0xea, 0xea, 0xea, 0xe9, 0xe9, 0xe9, 0xe9, 0xe8,
+	0xe8, 0xe8, 0xe8, 0xe7, 0xe7, 0xe7, 0xe7, 0xe6, 0xe6, 0xe6, 0xe6, 0xe5,
+	0xe5, 0xe5, 0xe5, 0xe4, 0xe4, 0xe4, 0xe4, 0xe3, 0xe3, 0xe3, 0xe3, 0xe2,
+	0xe2, 0xe2, 0xe2, 0xe1, 0xe1, 0xe1, 0xe1, 0xe0, 0xe0, 0xe0, 0xe0, 0xdf,
+	0xdf, 0xdf, 0xdf, 0xdf, 0xdf, 0xdf, 0xdf, 0xde, 0xde, 0xde, 0xde, 0xde,
+	0xde, 0xde, 0xde, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdc,
+	0xdc, 0xdc, 0xdc, 0xdc, 0xdc, 0xdc, 0xdc, 0xdb, 0xdb, 0xdb, 0xdb, 0xdb,
+	0xdb, 0xdb, 0xdb, 0xda, 0xda, 0xda, 0xda, 0xda, 0xda, 0xda, 0xda, 0xd9,
+	0xd9, 0xd9, 0xd9, 0xd9, 0xd9, 0xd9, 0xd9, 0xd8, 0xd8, 0xd8, 0xd8, 0xd8,
+	0xd8, 0xd8, 0xd8, 0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xd6,
+	0xd6, 0xd6, 0xd6, 0xd6, 0xd6, 0xd6, 0xd6, 0xd5, 0xd5, 0xd5, 0xd5, 0xd5,
+	0xd5, 0xd5, 0xd5, 0xd4, 0xd4, 0xd4, 0xd4, 0xd4, 0xd4, 0xd4, 0xd4, 0xd3,
+	0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd2, 0xd2, 0xd2, 0xd2, 0xd2,
+	0xd2, 0xd2, 0xd2, 0xd1, 0xd1, 0xd1, 0xd1, 0xd1, 0xd1, 0xd1, 0xd1, 0xd0,
+	0xd0, 0xd0, 0xd0, 0xd0, 0xd0, 0xd0, 0xd0, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf,
+	0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf, 0xce,
+	0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce, 0xce,
+	0xce, 0xce, 0xce, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd,
+	0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcd, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc,
+	0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcb,
+	0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb, 0xcb,
+	0xcb, 0xcb, 0xcb, 0xca, 0xca, 0xca, 0xca, 0xca, 0xca, 0xca, 0xca, 0xca,
+	0xca, 0xca, 0xca, 0xca, 0xca, 0xca, 0xca, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9,
+	0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc9, 0xc8,
+	0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8,
+	0xc8, 0xc8, 0xc8, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7,
+	0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc7, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6,
+	0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc5,
+	0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5, 0xc5,
+	0xc5, 0xc5, 0xc5, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4,
+	0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc4, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3,
+	0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc2,
+	0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2, 0xc2,
+	0xc2, 0xc2, 0xc2, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1,
+	0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc1, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
+	0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xbf,
+	0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+	0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+	0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe,
+	0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe,
+	0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe,
+	0xbe, 0xbe, 0xbe, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd,
+	0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd,
+	0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbc,
+	0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc,
+	0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc,
+	0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
+	0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
+	0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
+	0xbb, 0xbb, 0xbb, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba,
+	0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba,
+	0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xb9,
+	0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9,
+	0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9,
+	0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
+	0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
+	0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
+	0xb8, 0xb8, 0xb8, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7,
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+	0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82,
+	0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82,
+	0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82,
+	0x82, 0x82, 0x82, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
+	0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+	0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80
+};
+
+/* Table for ITU-T G.711 mu-law decompanding to 16-bit signed PCM */
+const int16_t ulaw2pcm[] = {
+	-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
+	-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
+	-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
+	-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
+	-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
+	-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
+	-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
+	-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
+	-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
+	-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
+	-876, -844, -812, -780, -748, -716, -684, -652,
+	-620, -588, -556, -524, -492, -460, -428, -396,
+	-372, -356, -340, -324, -308, -292, -276, -260,
+	-244, -228, -212, -196, -180, -164, -148, -132,
+	-120, -112, -104, -96, -88, -80, -72, -64,
+	-56, -48, -40, -32, -24, -16, -8, 0,
+
+	32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
+	23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
+	15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
+	11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
+	7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
+	5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
+	3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
+	2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
+	1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
+	1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
+	876, 844, 812, 780, 748, 716, 684, 652,
+	620, 588, 556, 524, 492, 460, 428, 396,
+	372, 356, 340, 324, 308, 292, 276, 260,
+	244, 228, 212, 196, 180, 164, 148, 132,
+	120, 112, 104, 96, 88, 80, 72, 64,
+	56, 48, 40, 32, 24, 16, 8, 0
+};
diff --git a/src/log.h b/src/log.h
new file mode 100644
index 0000000..0798200
--- /dev/null
+++ b/src/log.h
@@ -0,0 +1,83 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_LOG_H
+#define _URTC_LOG_H
+
+#include <stdio.h>
+
+#ifdef _cplusplus
+extern "C" {
+#endif
+
+enum level {
+	TRACE = 0,
+	DEBUG,
+	INFO,
+	WARN,
+	ERROR,
+	FATAL,
+	NUM_LEVELS // must be last
+};
+
+static const char *logl[NUM_LEVELS] = {
+	"\033[0;37m",	// trace	(gray)
+	"\033[0;32m",	// debug	(green)
+	          "",	// info		(white)
+	"\033[0;33m",	// warn		(yellow)
+	"\033[0;35m",	// error	(magenta)
+	"\033[0;31m"	// fatal	(red)
+};
+
+static const char *logn[NUM_LEVELS] = {
+	"[trace] ",		// trace	(gray)
+	"[debug] ",		// debug	(green)
+	"[info] ",		// info		(white)
+	"[warn] ",		// warn		(yellow)
+	"[error] ",		// error	(magenta)
+	"[fatal] "		// fatal	(red)
+};
+
+static const char *logr[NUM_LEVELS] = {
+	"\033[0m\n",			// trace
+	"\033[0m\n",			// debug
+	       "\n",			// info
+	"\033[0m\n",			// warn
+	"\033[0m\n",			// error
+	"\033[0m\n"				// fatal
+};
+
+#define STRINGIFY(x) #x
+#define TOSTRING(x) STRINGIFY(x)
+#define AT __FILE__ ":" TOSTRING(__LINE__)
+
+#define log(lvl, format, ...) \
+	do { \
+		fprintf(stderr, "%s" AT " %s" format "%s", logl[lvl], logn[lvl], ##__VA_ARGS__, logr[lvl]); \
+	} while (0);
+
+#ifdef _cplusplus
+}
+#endif
+
+#endif // _URTC_LOG_H
diff --git a/src/mdns.c b/src/mdns.c
new file mode 100644
index 0000000..fa782e4
--- /dev/null
+++ b/src/mdns.c
@@ -0,0 +1,607 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <net/if.h>						// IFF_LOOPBACK (include pre ifaddrs.h)
+#include <ifaddrs.h>					// getifaddrs
+#include <limits.h>						// HOST_NAME_MAX
+#include <stdbool.h>
+#include <string.h>						// memcpy
+#include <unistd.h>						// sleep
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#ifdef WITH_IPV6
+  #include <netinet6/in6.h>
+#endif
+#include <sys/socket.h>					// sendto, setsocketopt, socket
+
+#include "err.h"
+#include "log.h"
+#include "mdns.h"
+#include "uuid.h"
+
+#define MDNS_ADDR         "224.0.0.251"
+#define MDNS_PORT                 5353
+
+#define DEFAULT_TTL                120  // time-to-live recommended by RFC 6762
+
+#define CLASS_INTERNET	             1
+#define CACHE_FLUSH           (1 << 15)
+
+#define FLAG_RESPONSE         (1 << 15)
+#define FLAG_OPCODE         (0xF << 11)
+
+#ifndef HOST_NAME_MAX
+  #define HOST_NAME_MAX            255
+#endif
+
+struct __attribute__((__packed__)) header {
+	uint16_t id;
+	uint16_t flags;
+	uint16_t n_question;				// number of question records
+	uint16_t n_answer;					// number of answer records
+	uint16_t n_authority;				// number of authority records
+	uint16_t n_additional;				// number of additional records
+};
+
+struct __attribute__((__packed__)) qname {
+	uint8_t size;
+	uint8_t name[];
+};
+
+struct __attribute__((__packed__)) answer {
+	// variable length name precedes answer
+	uint16_t type;
+	uint16_t class;
+	uint32_t ttl;
+	uint16_t size;
+	uint8_t  data[];
+};
+
+/**
+ * Subscribe to mDNS queries
+ *
+ * Opens new multicast socket on the mDNS port. This socket receives and can
+ * be used to send mDNS datagrams. Close with mdns_unsubscribe().
+ *
+ * \return Socket file descriptor on success, negative on error.
+ */
+int mdns_subscribe() {
+	// create socket
+	int sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (-1 == sockfd) {
+		log(ERROR, "%s", strerror(errno));
+		goto _fail_create_socket;
+	}
+
+	// enable address/port reuse
+	{
+		const unsigned int opt = 1;
+		if (-1 == setsockopt(
+			sockfd,
+			SOL_SOCKET,
+#if defined(__APPLE__) || defined(__FreeBSD__)
+			SO_REUSEPORT,
+#else
+			SO_REUSEADDR,
+#endif
+			&opt,
+			sizeof(opt)
+		)) {
+			log(ERROR, "%s", strerror(errno));
+			goto _fail_enable_addr_reuse;
+		}
+	}
+
+	// bind socket to mDNS query port
+	{
+		const struct sockaddr_in mgroup = {
+			.sin_family = AF_INET,
+			.sin_addr.s_addr = htonl(INADDR_ANY),
+			.sin_port = htons(MDNS_PORT)
+		};
+		if (-1 == bind(sockfd, (struct sockaddr *)(&mgroup), sizeof(mgroup))) {
+			log(ERROR, "%s", strerror(errno));
+			goto _fail_bind;
+		}
+	}
+
+	// disable loopback
+	{
+		const int opt = 0;
+		if (-1 == setsockopt(
+			sockfd,
+			IPPROTO_IP,
+			IP_MULTICAST_LOOP,
+			&opt,
+			sizeof(opt)
+		)) {
+			log(ERROR, "setsockopt: %s", strerror(errno));
+			goto _fail_disable_loopback;
+		}
+	}
+
+	// join multicast group
+	{
+		const struct ip_mreqn imr = {
+			.imr_multiaddr.s_addr = inet_addr(MDNS_ADDR),
+			.imr_address.s_addr = htonl(INADDR_ANY)
+		};
+		if (-1 == setsockopt(
+			sockfd,
+			IPPROTO_IP,
+			IP_ADD_MEMBERSHIP,
+			&imr,
+			sizeof(imr)
+		)) {
+			log(ERROR, "setsockopt: %s", strerror(errno));
+			goto _fail_join_multicast_group;
+		}
+	}
+
+	return sockfd;
+
+_fail_join_multicast_group:
+_fail_disable_loopback:
+_fail_bind:
+_fail_enable_addr_reuse:
+	close(sockfd);
+_fail_create_socket:
+
+	return -URTC_ERR;
+}
+
+/**
+ * Unsubscribe from mDNS queries
+ *
+ * Close multicast socket previously opened with mdns_subscribe().
+ *
+ * \param sockfd Socket file descriptor returned by mdns_subscribe().
+ *
+ * \return 0 on success, negative on error.
+ */
+int mdns_unsubscribe(int sockfd) {
+	if (-1 == close(sockfd)) {
+		log(ERROR, "close: %s", strerror(errno));
+		return -URTC_ERR;
+	}
+
+	return 0;
+}
+
+/**
+ * Send a multicast DNS query
+ *
+ * \param name Hostname to query. Must end with ".local".
+ *
+ * \return 0 on success, negative on error.
+ */
+int mdns_query(const char *name) {
+	// create socket
+	int msockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (-1 == msockfd) {
+		log(FATAL, "socket: %s", strerror(errno));
+	}
+
+	uint8_t q[512];
+	size_t qlen = 0;
+
+	// header
+	struct header hdr = {
+		.n_question = htons(1)
+	};
+	memcpy(&q[qlen], &hdr, sizeof(hdr));
+	qlen += sizeof(hdr);
+
+	// qname
+	q[qlen] = strlen(name);
+	memcpy(&q[1 + qlen], name, strlen(name));
+	qlen += 1 + q[qlen];
+
+	q[qlen] = strlen("local");
+	memcpy(&q[1 + qlen], "local", strlen("local"));
+	qlen += 1 + q[qlen];
+
+	q[qlen++] = 0; // root record
+
+	// qtype: 255 = any
+	q[qlen++] = 0;
+	q[qlen++] = 255;
+
+	// qclass: 1 = ipv4
+	q[qlen++] = 0x80; // unicast response please
+	q[qlen++] = 1;
+
+	// send query
+	struct sockaddr_in mgroup = {
+		.sin_family = AF_INET,
+		.sin_addr.s_addr = inet_addr(MDNS_ADDR),
+		.sin_port = htons(MDNS_PORT)
+	};
+	if (-1 == sendto(msockfd, q, qlen, 0, (struct sockaddr *)(&mgroup), sizeof(mgroup))) {
+		log(FATAL, "sendto: %s", strerror(errno));
+	}
+
+	return 0;
+}
+
+/**
+ * Simple mDNS response parser (single record only)
+ *
+ * \param response mDNS response packet
+ * \param len Length of response, in bytes
+ *
+ * \return 0 on success, negative on error.
+ */
+int mdns_parse_response(const void *response, size_t len)
+{
+	// sanity checks
+	if (!response) return -URTC_ERR_BAD_ARGUMENT;
+	if (len < sizeof(struct header)) return -URTC_ERR_MALFORMED;
+
+	struct header *hdr = (struct header *)(response);
+	response += sizeof(struct header);
+	len -= sizeof(struct header);
+
+	// transaction id must be zero
+	if (0 != hdr->id) return -URTC_ERR_MALFORMED;
+
+	// flags must indicate a response
+	if (!(ntohs(hdr->flags) & FLAG_RESPONSE)) return -URTC_ERR_MALFORMED;
+
+	// sent single question, expecting reponse for single question
+	if (1 != ntohs(hdr->n_question)) return -URTC_ERR_MALFORMED;
+
+	// parse query names
+	struct qname *qname;
+	do {
+		if (len < 1) return -URTC_ERR_MALFORMED;
+		qname = (struct qname *)(response);
+		if (len < 1 + qname->size) return -URTC_ERR_MALFORMED;
+		response += 1 + qname->size;
+		len -= 1 + qname->size;
+	} while (qname->size);
+
+	// parse query type (ignore)
+	if (len < sizeof(uint16_t)) return -URTC_ERR_MALFORMED;
+	response += sizeof(uint16_t);
+	len -= sizeof(uint16_t);
+
+	// parse query class (ignore)
+	if (len < sizeof(uint16_t)) return -URTC_ERR_MALFORMED;
+	response += sizeof(uint16_t);
+	len -= sizeof(uint16_t);
+
+	// answers
+	for (int i = 0; i < ntohs(hdr->n_answer); i++) {
+		uint16_t size;
+		uint8_t namelen;
+
+		// parse name (assume matches)
+		if (len < 2) return -URTC_ERR_MALFORMED;
+		namelen = *(uint8_t *)response;
+		switch (namelen) {
+			// name compression
+			case 0xc0:
+				response += 2;
+				len -= 2;
+				break;
+			// no name compression
+			default:
+				response += 1 + namelen;
+				len -= 1 + namelen;
+				break;
+		}
+
+		if (len < sizeof(struct answer)) return -URTC_ERR_MALFORMED;
+		struct answer *answer = (struct answer *)response;
+		response += sizeof(struct answer);
+		len -= sizeof(struct answer);
+
+		size = ntohs(answer->size);
+		if (len < size) return -URTC_ERR_MALFORMED;
+		response += size;
+		len -= size;
+	}
+
+	return 0;
+}
+
+/**
+ * Check if run-length encoded query name resource records match hostname
+ *
+ * \param expected Expected hostname record.
+ * \param q Length-encoded query names.
+ * \param len Pointer to minimum length of q. Overwritten with actual length.
+ *
+ * \return Positive on match, 0 on no match, negative on malformed query.
+ */
+static int match(const char *expected, const uint8_t *q, int *len) {
+	struct qname *qname;
+	bool matches;
+	int n_records;
+	int n;
+
+	if (!q) return -URTC_ERR_BAD_ARGUMENT;
+	if (!expected) return -URTC_ERR_BAD_ARGUMENT;
+	if (!len) return -URTC_ERR_BAD_ARGUMENT;
+
+	n = *len;
+	matches = true;
+
+	n_records = 0;
+	do {
+		// minimum size check: a single root record (1 byte)
+		if (n < 1) return -URTC_ERR_MALFORMED;
+		qname = (struct qname *)(q);
+
+		// minimum size check: length byte plus stated length
+		if (n < 1 + qname->size) return -URTC_ERR_MALFORMED;
+
+		// match records
+		switch (n_records) {
+			// match hostname record
+			case 0:
+				if (qname->size == strlen(expected)) {
+					if (0 == memcmp(qname->name, expected, qname->size)) {
+						break; // matched
+					}
+				}
+				matches = false;
+				break;
+			// match "local" record
+			case 1:
+				if (qname->size == sizeof("local")-1) {
+					if (0 == memcmp(qname->name, "local", sizeof("local")-1)) {
+						break; //matched
+					}
+				}
+				matches = false;
+				break;
+			// match root record
+			case 2:
+				if (qname->size == 0) {
+					break;
+				}
+				matches = false;
+				break;
+			// match ancillary records
+			default:
+				matches = false;
+				break;
+		}
+
+		q += 1 + qname->size;
+		n -= 1 + qname->size;
+		n_records++;
+	} while(qname->size);
+
+	// update with actual length of run-length encoding
+	*len -= n;
+
+	return matches;
+}
+
+/**
+ * Validate whether mDNS packet is a query for the specified hostname
+ *
+ * Only standard, single question queries are supported. All others
+ * return an error.
+ *
+ * \param q Query buffer (from network)
+ * \param n Size of query (in bytes)
+ * \param hostname Queried hostname
+ *
+ * \return 0 on success, negative on error
+ */
+int mdns_validate_query(const uint8_t *q, size_t n, const char *hostname)
+{
+	const struct header *hdr = (struct header *)q;
+	const uint8_t *qi = q;
+	const size_t ni = n;
+	int found;
+
+	found = 0;
+
+	// sanity checks
+	if (!q) return -URTC_ERR_BAD_ARGUMENT;
+	if (n < sizeof(struct header)) return -URTC_ERR_MALFORMED;
+
+	q += sizeof(struct header);
+	n -= sizeof(struct header);
+
+	// transaction id must be zero
+	// note: hdr in host byte order (0 is byte order agnostic)
+	if (0 != hdr->id) return -URTC_ERR_MALFORMED;
+
+	// only support standard, non-truncated, non-recursive queries
+	// note: hdr in host byte order (non-0 is byte order agnostic)
+	if (hdr->flags) return -URTC_ERR_NOT_IMPLEMENTED;
+
+	// parse questions
+	for (int j = 0; j < ntohs(hdr->n_question); j++) {
+		bool matched;
+		int ret;
+		int len;
+
+		// upper two bits set? "compressed" records
+		matched = false;
+		if (n > 2 && q[0] >> 6 == 3) {
+			// compressed (i.e. offset to previous record)
+			const uint16_t offset = ((q[0] & 0x3F) << 8) | q[1];
+			if (offset > ni) return -URTC_ERR_MALFORMED;
+			len = ni - offset;
+			ret = match(hostname, qi + offset, &len);
+			q += 2;
+			n -= 2;
+		} else {
+			// uncompressed
+			len = n;
+			ret = match(hostname, q, &len);
+			q += len;
+			n -= len;
+		}
+		if (ret < 0) return ret;
+		if (ret > 0) matched = true;
+
+		// parse query type for A and AAAA records
+		if (n < sizeof(uint16_t)) return -URTC_ERR_MALFORMED;
+		if (matched) {
+			uint16_t type = ntohs(*(uint16_t *)(q));
+			if (TYPE_A == type || TYPE_AAAA == type) {
+				found |= type;
+			}
+		}
+		q += sizeof(uint16_t);
+		n -= sizeof(uint16_t);
+
+		// parse query class (ignore)
+		if (n < sizeof(uint16_t)) return -URTC_ERR_MALFORMED;
+		q += sizeof(uint16_t);
+		n -= sizeof(uint16_t);
+	}
+
+	return found;
+}
+
+/**
+ * Send mDNS response
+ *
+ * \param hostname NULL-terminated hostname (sans ".local" suffix)
+ *
+ * \return 0 on success, negative on error
+ */
+int mdns_send_response(int sockfd, const char *hostname) {
+	struct ifaddrs *ifaddrs;
+	struct header *hdr;
+	uint8_t *wr;						// writer (convenience pointer)
+	uint8_t response[
+		sizeof(struct header) +
+		1 + HOST_NAME_MAX + 1 +			// max size of length and host record
+		1 + sizeof(".local") +			// size of length and local record
+		1 +								// size of root record
+		sizeof(struct answer) +
+		16								// size of AAAA record (largest record)
+	];
+	hdr = (struct header *)(response);
+	wr  = response;
+
+	// write header
+	*hdr = (struct header){
+		.id           = 0,
+		.flags        = htons(FLAG_RESPONSE),
+		.n_question   = 0,
+		.n_answer     = 0, 
+		.n_authority  = 0,
+		.n_additional = 0
+	};
+	wr += sizeof(struct header);
+
+	// get linked list of network interfaces
+	if (-1 == getifaddrs(&ifaddrs)) {
+		log(ERROR, "%s", strerror(errno));
+		goto _fail_getifaddrs;
+	}
+
+	// for each network interface...
+	for (struct ifaddrs *ifaddr = ifaddrs; ifaddr; ifaddr = ifaddr->ifa_next) {
+		// skip loopback interfaces
+		if (ifaddr->ifa_flags & IFF_LOOPBACK) continue;
+
+		// for an AF_INET* interface address, display the address
+		if (ifaddr->ifa_addr && ifaddr->ifa_addr->sa_family == AF_INET) {
+
+			// write host record
+			{
+				strncpy((char *)(wr + 1), hostname, HOST_NAME_MAX);
+				wr[1 + HOST_NAME_MAX - 1] = '\0';
+				*wr = strlen((char *)(wr + 1));
+				wr += 1 + strlen((char *)(wr + 1));
+			}
+
+			// write local record
+			{
+				const char local[] = "local";
+				*wr++ = sizeof(local) - 1;
+				memcpy(wr, local, sizeof(local) - 1);
+				wr += sizeof(local) - 1;
+			}
+
+			// write root record
+			*wr++ = 0;
+
+			// write answer
+			{
+				struct answer ans = {
+					.type  = htons(TYPE_A),
+					.class = htons(CACHE_FLUSH | CLASS_INTERNET),
+					.ttl   = htonl(DEFAULT_TTL),
+					.size  = htons(sizeof(struct in_addr)),
+				};
+				memcpy(wr, &ans, sizeof(ans));
+				wr += sizeof(ans);
+
+				memcpy(wr,
+					&(((struct sockaddr_in *)(ifaddr->ifa_addr))->sin_addr),
+					sizeof(struct in_addr));
+				wr += sizeof(struct in_addr);
+			}
+
+			// increment number of answers
+			hdr->n_answer++;
+
+			if (hdr->n_answer == 1) {
+				break;
+			}
+		}
+	}
+
+	// free linked list of network interfaces
+	freeifaddrs(ifaddrs);
+
+	// convert to network byte order
+	hdr->n_answer = htons(hdr->n_answer);
+
+	// send response
+	struct sockaddr_in mgroup = {
+		.sin_family = AF_INET,
+		.sin_addr.s_addr = inet_addr(MDNS_ADDR),
+		.sin_port = htons(MDNS_PORT)
+	};
+	if (-1 == sendto(
+		sockfd,
+		response,
+		wr - response,
+		0,
+		(struct sockaddr *)(&mgroup),
+		sizeof(mgroup)
+	)) {
+		log(FATAL, "sendto: %s", strerror(errno));
+	}
+
+	return 0;
+
+_fail_getifaddrs:
+	return -URTC_ERR;
+}
diff --git a/src/mdns.h b/src/mdns.h
new file mode 100644
index 0000000..7e73ba6
--- /dev/null
+++ b/src/mdns.h
@@ -0,0 +1,43 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_MDNS_H
+#define _URTC_MDNS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define TYPE_A                       1  // IPv4 record
+#define TYPE_AAAA                   28  // IPv6 record
+
+// server: for processing queries and generating responses
+int mdns_subscribe();
+int mdns_unsubscribe(int sockfd);
+int mdns_validate_query(const uint8_t *q, size_t n, const char *hostname);
+int mdns_send_response(int sockfd, const char *hostname);
+
+// client: for sending queries and processing responses
+int mdns_parse_response(const void *response, size_t len);
+int mdns_query(const char *name);
+
+#endif // _URTC_MDNS_H
diff --git a/src/prng.c b/src/prng.c
new file mode 100644
index 0000000..147304b
--- /dev/null
+++ b/src/prng.c
@@ -0,0 +1,47 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include "prng.h"
+
+/**
+ * Initialize pseudo-random number generator
+ */
+void prng_init() {
+	srand(time(NULL));
+}
+
+/**
+ * Fill specified memory with pseudo-random data
+ *
+ * \param dst Destination memory
+ * \param sz Size (in bytes) of destination memory
+ */
+void prng(void *dst, size_t sz) {
+	for (; sz; sz--) {
+		*(uint8_t *)dst++ = rand() & 0xFF;
+	}
+}
diff --git a/src/prng.h b/src/prng.h
new file mode 100644
index 0000000..b1ad9b4
--- /dev/null
+++ b/src/prng.h
@@ -0,0 +1,31 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_PRNG_H
+#define _URTC_PRNG_H
+
+void prng_init();
+
+void prng(void *dst, size_t sz);
+
+#endif // _URTC_PRNG_H
diff --git a/src/sdp.c b/src/sdp.c
new file mode 100644
index 0000000..baa1ece
--- /dev/null
+++ b/src/sdp.c
@@ -0,0 +1,699 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "err.h"
+#include "log.h"
+#include "sdp.h"
+
+#define STRINGIFY(x) #x
+#define TOSTRING(x) STRINGIFY(x)
+
+/**
+ * Parse group attribute
+ *
+ * Format is:
+ *
+ *     a=group:BUNDLE <mid> <mid> ...
+ *
+ * Only the BUNDLE semantics value is supported.
+ *
+ * \param sdp[out] SDP structure updated with bundle id tags.
+ * \param value[in] NULL-terminated string containing SDP attribute line value
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_attr_group(struct sdp *sdp, char *val) {
+	char *id = val;
+
+	val = strsep(&id, " ");
+
+	if (0 == strcmp("BUNDLE", val)) {
+		for (int i = 0; id && i < SDP_MAX_BUNDLE_IDS; i++) {
+			strncpy(sdp->mid[i], strsep(&id, " "), SDP_MAX_BUNDLE_ID_SIZE);
+		}
+	}
+	return 0;
+}
+
+static int sdp_parse_attr_msid_semantic(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+static int sdp_parse_attr_rtcp(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+static int sdp_parse_attr_ice_ufrag(struct sdp *sdp, const char *val) {
+	if (sdp->ufrag != strncpy(sdp->ufrag, val, sizeof(sdp->ufrag))) {
+		return -1;
+	}
+	return 0;
+}
+
+static int sdp_parse_attr_ice_password(struct sdp *sdp, const char *val) {
+	if (sdp->pwd != strncpy(sdp->pwd, val, sizeof(sdp->pwd))) {
+		return -1;
+	}
+	return 0;
+}
+
+static int sdp_parse_attr_ice_options(struct sdp *sdp, const char *val) {
+	if (0 == strcmp("trickle", val)) {
+		sdp->ice_options.trickle = true;
+	}
+	return 0;
+}
+
+/**
+ * Parse fingerprint
+ *
+ * Only SHA-256 fingerprint is supported.
+ *
+ * \param[out] sdp SDP structure updated with parsed content.
+ * \param[in]  val NULL-terminated string.
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_attr_fingerprint(struct sdp *sdp, char *val) {
+	char *fingerprint = val;
+
+	val = strsep(&fingerprint, " ");
+
+	if (fingerprint) {
+		if (0 == strcmp("sha-256", val)) {
+			if (32 != sscanf(fingerprint,
+				"%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:"
+				"%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:"
+				"%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:"
+				"%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX",
+				&sdp->fingerprint.sha256[0],  &sdp->fingerprint.sha256[1],
+				&sdp->fingerprint.sha256[2],  &sdp->fingerprint.sha256[3],
+				&sdp->fingerprint.sha256[4],  &sdp->fingerprint.sha256[5],
+				&sdp->fingerprint.sha256[6],  &sdp->fingerprint.sha256[7],
+				&sdp->fingerprint.sha256[8],  &sdp->fingerprint.sha256[9],
+				&sdp->fingerprint.sha256[10], &sdp->fingerprint.sha256[11],
+				&sdp->fingerprint.sha256[12], &sdp->fingerprint.sha256[13],
+				&sdp->fingerprint.sha256[14], &sdp->fingerprint.sha256[15],
+				&sdp->fingerprint.sha256[16], &sdp->fingerprint.sha256[17],
+				&sdp->fingerprint.sha256[18], &sdp->fingerprint.sha256[19],
+				&sdp->fingerprint.sha256[20], &sdp->fingerprint.sha256[21],
+				&sdp->fingerprint.sha256[22], &sdp->fingerprint.sha256[23],
+				&sdp->fingerprint.sha256[24], &sdp->fingerprint.sha256[25],
+				&sdp->fingerprint.sha256[26], &sdp->fingerprint.sha256[27],
+				&sdp->fingerprint.sha256[28], &sdp->fingerprint.sha256[29],
+				&sdp->fingerprint.sha256[30], &sdp->fingerprint.sha256[31]
+			)) {
+				return -URTC_ERR_SDP_MALFORMED;
+			}
+		} else {
+			return -URTC_ERR_SDP_UNSUPPORTED_FINGERPRINT_ALGO;
+		}
+	} else {
+		return -URTC_ERR_SDP_MALFORMED;
+	}
+
+	return 0;
+}
+
+static int sdp_parse_attr_setup(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+static int sdp_parse_attr_mid(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+static int sdp_parse_attr_extmap(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+/**
+ * Parse RTP map
+ *
+ * Expected format is:
+ * 
+ *     <payload type> <encoding name>/<clock rate> [/<encoding parameters>]
+ *
+ * \param[out] sdp SDP structure updated with parsed content.
+ * \param[in]  val NULL-terminated string.
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_attr_rtpmap(struct sdp *sdp, char *val) {
+	if (!val) return -URTC_ERR_SDP_MALFORMED;
+
+	unsigned int pt;                    // payload type
+	char         en[7];                 // encoding name
+	unsigned int cr;                    // clock rate
+	
+	if (3 != sscanf(val, "%3d %6[a-zA-Z0-9]%*c%5d", &pt, en, &cr)) {
+		return -URTC_ERR_SDP_MALFORMED_ATTRIBUTE;
+	}
+
+	if (0 == strcmp("H264", en)) {
+		for (int i = 0; i < sdp->video.count; i++) {
+			if (sdp->video.params[i].type == pt) {
+				sdp->video.params[i].clock = cr;
+				sdp->video.params[i].codec = SDP_CODEC_H264;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int sdp_parse_attr_rtcp_feedback(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+static int sdp_parse_attr_fmtp(struct sdp *sdp, const char *val) {
+	/* not implemented */
+	return 0;
+}
+
+/**
+ * Parse SDP attribute line
+ *
+ * \param sdp[out] SDP structure updated with parsed content
+ * \param attr[in] NULL-terminated SDP attribute string (after "a=")
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_attribute(struct sdp *sdp, char *attr) {
+	char *value = attr;
+
+	// Find colon separating attribute from value
+	attr = strsep(&value, ":");
+
+	if (value) {
+		if (0 == strcmp("group", attr)) {
+			return sdp_parse_attr_group(sdp, value);
+		} else if (0 == strcmp("msid-semantic", attr)) {
+			return sdp_parse_attr_msid_semantic(sdp, value);
+		} else if (0 == strcmp("rtcp", attr)) {
+			return sdp_parse_attr_rtcp(sdp, value);
+		} else if (0 == strcmp("ice-ufrag", attr)) {
+			return sdp_parse_attr_ice_ufrag(sdp, value);
+		} else if (0 == strcmp("ice-pwd", attr)) {
+			return sdp_parse_attr_ice_password(sdp, value);
+		} else if (0 == strcmp("ice-options", attr)) {
+			return sdp_parse_attr_ice_options(sdp, value);
+		} else if (0 == strcmp("fingerprint", attr)) {
+			return sdp_parse_attr_fingerprint(sdp, value);
+		} else if (0 == strcmp("setup", attr)) {
+			return sdp_parse_attr_setup(sdp, value);
+		} else if (0 == strcmp("mid", attr)) {
+			return sdp_parse_attr_mid(sdp, value);
+		} else if (0 == strcmp("extmap", attr)) {
+			return sdp_parse_attr_extmap(sdp, value);
+		} else if (0 == strcmp("rtpmap", attr)) {
+			return sdp_parse_attr_rtpmap(sdp, value);
+		} else if (0 == strcmp("rtcp-fb", attr)) {
+			return sdp_parse_attr_rtcp_feedback(sdp, value);
+		} else if (0 == strcmp("fmtp", attr)) {
+			return sdp_parse_attr_fmtp(sdp, value);
+		}
+	} else /* flag */ {
+		if (0 == strcmp("recvonly", attr)) {
+			sdp->mode = SDP_MODE_RECEIVE_ONLY;
+		} else if (0 == strcmp("sendonly", attr)) {
+			sdp->mode = SDP_MODE_SEND_ONLY;
+		} else if (0 == strcmp("sendrecv", attr)) {
+			sdp->mode = SDP_MODE_SEND_AND_RECEIVE;
+		} else if (0 == strcmp("rtcp-mux", attr)) {
+			sdp->rtcp_mux = true;
+		} else if (0 == strcmp("rtcp-rsize", attr)) {
+			sdp->rtcp_rsize = true;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * Parse media description line
+ *
+ * Format is:
+ *
+ *     m=<audio|video> <port> UDP/TLS/RTP/SAVPF <n> ...
+ *
+ * Only the UDP/TLS/RTP/SAVPF transport protocol is supported.
+ *
+ * \param sdp[out] SDP structure updated with username, session id and
+ *                 session version.
+ * \param value[in] NULL-terminated string containing SDP line value
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_media_description(struct sdp *sdp, char *value) {
+	char *next = value;
+
+	value = strsep(&next, " ");
+
+	if (0 == strcmp("audio", value)) {
+		/* not implemented */
+	} else if (0 == strcmp("video", value)) {
+		if (!next) return -URTC_ERR_SDP_MALFORMED_MEDIA;
+
+		/* get port */
+		value = strsep(&next, " ");
+		if (1 != sscanf(value, "%5hd", &sdp->video.port)) {
+			return -URTC_ERR_SDP_MALFORMED_MEDIA;
+		}
+		if (!next) return -URTC_ERR_SDP_MALFORMED_MEDIA;
+
+		/* get protocol: only "UDP/TLS/RTP/SAVPF" supported */
+		value = strsep(&next, " ");
+		if (0 != strcmp("UDP/TLS/RTP/SAVPF", value)) {
+			return -URTC_ERR_SDP_UNSUPPORTED_MEDIA_PROTOCOL;
+		}
+		if (!next) return -URTC_ERR_SDP_MALFORMED_MEDIA;
+
+		/* get RTP payload types */
+		sdp->video.count = 0;
+		for (
+			value = strsep(&next, " ");
+			value && sdp->video.count < SDP_MAX_RTP_PAYLOAD_TYPES;
+			value = strsep(&next, " ")
+		) {
+			unsigned int *v = &sdp->video.params[sdp->video.count].type;
+			if (1 != sscanf(value, "%3d", v)) {
+				return -URTC_ERR_SDP_MALFORMED_MEDIA;
+			}
+			sdp->video.count++;
+		}
+
+	} else if (0 == strcmp("text", value)) {
+		/* ignore */
+	} else if (0 == strcmp("message", value)) {
+		/* ignore */
+	} else if (0 == strcmp("application", value)) {
+		/* ignore */
+	} else {
+		return -URTC_ERR_SDP_UNSUPPORTED_MEDIA_TYPE;
+	}
+
+	return 0;
+}
+
+static int sdp_parse_connection_data(struct sdp *sdp, const char *value) {
+	return 0;
+}
+
+/**
+ * Parse version line
+ *
+ * Format is:
+ *
+ *     v=0
+ *
+ * Only version zero is supported. Anything else is an error.
+ *
+ * \param value[in] NULL-terminated string containing SDP line value
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_version(struct sdp *sdp, const char *value) {
+	if (0 != strcmp("0", value)) {
+		return -URTC_ERR_SDP_MALFORMED_VERSION;
+	}
+	sdp->version = 0;
+
+	return 0;
+}
+
+/**
+ * Parse origin line
+ *
+ * Format is:
+ *
+ *     o=<username> <sess-id> <sess-version> <nettype> <addrtype>
+ *       <unicast-address>
+ *
+ * <nettype> <addrtype> and <unicast-address> are ignored.
+ *
+ * \param sdp[out] SDP structure updated with username, session id and
+ *                 session version.
+ * \param value[in] NULL-terminated string containing SDP line value
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_origin(struct sdp *sdp, const char *value) {
+	if (3 != sscanf(value,
+		"%" TOSTRING(SDP_MAX_USERNAME_SIZE) "s "
+		"%" TOSTRING(SDP_MAX_SESSION_ID_SIZE) "[0-9] "
+		"%" TOSTRING(SDP_MAX_SESSION_VERSION_SIZE) "[0-9] "
+		"IN IP4 127.0.0.1",
+		sdp->username,
+		sdp->session_id,
+		sdp->session_version
+	)) {
+		return -URTC_ERR_SDP_MALFORMED_ORIGIN;
+	}
+
+	return 0;
+}
+
+static int sdp_parse_session_name(struct sdp *sdp, const char *value) {
+	return 0;
+}
+
+/**
+ * Parse timing line
+ *
+ * Format is:
+ *
+ *     t=<start-time> <stop-time>
+ *
+ * \param sdp[out] SDP structure updated with start and stop time
+ * \param value[in] NULL-terminated string containing SDP line value
+ *
+ * \return 0 on success. Negative on error.
+ */
+static int sdp_parse_timing(struct sdp *sdp, const char *value) {
+	if (2 != sscanf(value, "%10lli %10lli",
+		(unsigned long long *)&sdp->start_time,
+		(unsigned long long *)&sdp->stop_time
+	)) {
+		return -URTC_ERR_SDP_MALFORMED_TIMING;
+	}
+
+	return 0;
+}
+
+/**
+ * Parse a line of SDP
+ *
+ * \param sdp[out] SDP structure to be updated with parsed information
+ * \param line[in] NULL-terminated string containing one line of SDP
+ *
+ * \return 0 on success, negative on error.
+ */
+static int sdp_parse_line(struct sdp *sdp, char *line) {
+	if (!line) return -URTC_ERR_BAD_ARGUMENT;
+	if (0 == strlen(line)) return 0;
+	if (strlen(line) < 3) return -URTC_ERR_SDP_MALFORMED;
+	if ('=' != line[1]) return -URTC_ERR_SDP_MALFORMED;
+
+	char type = line[0];
+	char *value = line + 2;
+
+	switch (type) {
+	case 'a':
+		return sdp_parse_attribute(sdp, value);
+	case 'c':
+		return sdp_parse_connection_data(sdp, value);
+	case 'o':
+		return sdp_parse_origin(sdp, value);
+	case 'm':
+		return sdp_parse_media_description(sdp, value);
+	case 's':
+		return sdp_parse_session_name(sdp, value);
+	case 't':
+		return sdp_parse_timing(sdp, value);
+	case 'v':
+		return sdp_parse_version(sdp, value);
+	default:
+		/* ignore unsupported types */
+		return 0;
+	}
+}
+
+
+int sdp_parse(struct sdp *dst, const char *str) {
+	if (!str) return -URTC_ERR_BAD_ARGUMENT;
+	if (!dst) return -URTC_ERR_BAD_ARGUMENT;
+
+	err_t retval = 0;
+
+	/* make a malleable copy of string for parser */
+	char *copy = malloc(strlen(str));
+	if (copy) {
+		strcpy(copy, str);
+
+		for (char *in = copy, *line = strsep(&in, "\r\n"); in; line = strsep(&in, "\r\n")) {
+			retval = sdp_parse_line(dst, line);
+			if (retval != 0) {
+				log(ERROR, "sdp_parse_line returned %i for %s", retval, line);
+				break;
+			}
+		}
+
+		free(copy);
+	} else {
+		return -URTC_ERR_INSUFFICIENT_MEMORY;
+	}
+
+	return retval;
+}
+
+int sdp_serialize(char *dst, size_t len, const struct sdp *src) {
+	int n;
+
+	// sanity check
+	if (!dst) return -URTC_ERR_BAD_ARGUMENT;
+	if (!src) return -URTC_ERR_BAD_ARGUMENT;
+
+	// write version
+	n = snprintf(dst, len, "v=%u\n", src->version);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write originator and session identifier
+	n = snprintf(dst, len,
+		"o=liburtc/0.0.0 %s %s IN IP4 127.0.0.1\n",
+		src->session_id,
+		src->session_version
+	);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write session name
+	n = snprintf(dst, len, "s=%s\n",
+		0 == strlen(src->session_name) ? " " : src->session_name);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write uri
+	n = snprintf(dst, len, "u=http://www.liburtc.org\n");
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write time descriptor
+	n = snprintf(dst, len, "t=%" PRIu64 " %" PRIu64 "\n",
+		src->start_time, src->stop_time);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write session attribute
+	n = snprintf(dst, len, "a=group:BUNDLE");
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+	for (int i = 0; i < SDP_MAX_BUNDLE_IDS; i++) {
+		if (strlen(src->mid[i]) > 0) {
+			n = snprintf(dst, len, " %s", src->mid[i]);
+			if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+			if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+			dst += n;
+			len -= n;
+		}
+	}
+	n = snprintf(dst, len, "\n");
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write video media description
+	if (src->video.count > 0) {
+		n = snprintf(
+			dst, len, "m=video %hd UDP/TLS/RTP/SAVPF", src->video.port
+		);
+		if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+		if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+		dst += n;
+		len -= n;
+		for (int i = 0; i < src->video.count; i++) {
+			if (src->video.params[i].codec == SDP_CODEC_H264) {
+				n = snprintf(dst, len, " %d", src->video.params[i].type);
+				if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+				if (n > len) return -URTC_ERR_SDP_MALFORMED;
+				dst += n;
+				len -= n;
+			}
+		}
+		n = snprintf(dst, len, "\n");
+		if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+		if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+		dst += n;
+		len -= n;
+	}
+
+	// TODO write rtcp attribute
+
+	// write connection information (TODO IPv6)
+	n = snprintf(dst, len, "c=IN IP4 0.0.0.0\n");
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write media attribute: ice ufrag
+	n = snprintf(dst, len, "a=ice-ufrag:%s\n", src->ufrag);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write media attribute: ice pwd
+	n = snprintf(dst, len, "a=ice-pwd:%s\n", src->pwd);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write media attribute: trickle ICE
+	if (src->ice_options.trickle) {
+		n = snprintf(dst, len, "a=ice-options:trickle\n");
+		if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+		if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+		dst += n;
+		len -= n;
+	}
+
+	// write media attribute: fingerprint
+	n = snprintf(dst, len,
+		"a=fingerprint:sha-256 "
+		"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
+		"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
+		"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:"
+		"%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX:%02hhX\n",
+		src->fingerprint.sha256[0], src->fingerprint.sha256[1],
+		src->fingerprint.sha256[2], src->fingerprint.sha256[3],
+		src->fingerprint.sha256[4], src->fingerprint.sha256[5],
+		src->fingerprint.sha256[6], src->fingerprint.sha256[7],
+		src->fingerprint.sha256[8], src->fingerprint.sha256[9],
+		src->fingerprint.sha256[10], src->fingerprint.sha256[11],
+		src->fingerprint.sha256[12], src->fingerprint.sha256[13],
+		src->fingerprint.sha256[14], src->fingerprint.sha256[15],
+		src->fingerprint.sha256[16], src->fingerprint.sha256[17],
+		src->fingerprint.sha256[18], src->fingerprint.sha256[19],
+		src->fingerprint.sha256[20], src->fingerprint.sha256[21],
+		src->fingerprint.sha256[22], src->fingerprint.sha256[23],
+		src->fingerprint.sha256[24], src->fingerprint.sha256[25],
+		src->fingerprint.sha256[26], src->fingerprint.sha256[27],
+		src->fingerprint.sha256[28], src->fingerprint.sha256[29],
+		src->fingerprint.sha256[30], src->fingerprint.sha256[31]
+	);
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// TODO write setup, mid
+
+	// write media attribute: mode
+	switch (src->mode) {
+		case SDP_MODE_RECEIVE_ONLY:
+			n = snprintf(dst, len, "a=recvonly\n");
+			break;
+		case SDP_MODE_SEND_ONLY:
+			n = snprintf(dst, len, "a=sendonly\n");
+			break;
+		case SDP_MODE_SEND_AND_RECEIVE:
+			n = snprintf(dst, len, "a=sendrecv\n");
+			break;
+		default:
+			return -URTC_ERR_SDP_MALFORMED;
+			break;
+	}
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	// write media attribute: rtcp mux
+	if (src->rtcp_mux) {
+		n = snprintf(dst, len, "a=rtcp-mux\n");
+		if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+		if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+		dst += n;
+		len -= n;
+	}
+
+	// write media attribute: rtcp rsize
+	if (src->rtcp_rsize) {
+		n = snprintf(dst, len, "a=rtcp-rsize\n");
+		if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+		if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+		dst += n;
+		n -= n;
+	}
+
+	// write dynamic profiles
+	for (int i = 0; i < src->video.count; i++) {
+		if (src->video.params[i].codec == SDP_CODEC_H264) {
+			n = snprintf(dst, len, "a=rtpmap:%d H264/%d\n",
+				src->video.params[i].type,
+				src->video.params[i].clock
+			);
+			if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+			if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+			dst += n;
+			len -= n;
+		}
+	}
+
+	// write media attribute: media id
+	// TODO fix hardcoded media id
+	n = snprintf(dst, len, "a=mid:0\n");
+	if (n < 0) return -URTC_ERR_SDP_MALFORMED;
+	if (n >= len) return -URTC_ERR_SDP_MALFORMED;
+	dst += n;
+	len -= n;
+
+	return 0;
+}
diff --git a/src/sdp.h b/src/sdp.h
new file mode 100644
index 0000000..b65b5e5
--- /dev/null
+++ b/src/sdp.h
@@ -0,0 +1,150 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_SDP_H
+#define _URTC_SDP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stdint.h>
+
+
+// Maximum size of SDP string (in bytes)
+#define SDP_MAX_SIZE					2048
+
+#define SDP_MAX_USERNAME_SIZE			32
+#define SDP_MAX_SESSION_ID_SIZE			32
+#define SDP_MAX_SESSION_VERSION_SIZE	32
+#define SDP_MAX_SESSION_NAME_SIZE		32
+
+#define SDP_MAX_BUNDLE_IDS				5
+#define SDP_MAX_BUNDLE_ID_SIZE			32
+#define SDP_MAX_RTP_PAYLOAD_TYPES		32
+
+
+typedef enum sdp_mode {
+	SDP_MODE_SEND_AND_RECEIVE = 0,
+	SDP_MODE_RECEIVE_ONLY,
+	SDP_MODE_SEND_ONLY
+} sdp_mode_t;
+
+typedef enum sdp_media {
+	SDP_MEDIA_TYPE_NULL = 0,
+	SDP_MEDIA_TYPE_AUDIO,
+	SDP_MEDIA_TYPE_VIDEO,
+	SDP_MEDIA_TYPE_TEXT,
+	SDP_MEDIA_TYPE_APPLICATION,
+	SDP_MEDIA_TYPE_MESSAGE
+} sdp_media_type_t;
+
+// Codecs recognized by SDP parser
+typedef enum sdp_codec {
+	SDP_CODEC_NULL = 0,
+	SDP_CODEC_H264,
+	SDP_CODEC_VP9
+} sdp_codec_t;
+
+// Dynamic payload type
+typedef struct sdp_rtpmap {
+	unsigned int      type;             // Dynamic RTP payload type (e.g. 96)
+	enum sdp_codec    codec;            // H264, VP9, etc.
+	unsigned int      clock;            // Typically 90kHz for video
+	unsigned int      flags;
+} sdp_rtpmap_t;
+
+typedef struct sdp {
+	// protocol version
+	uint8_t version;
+
+	// originator and session identifier
+	char username[SDP_MAX_USERNAME_SIZE+1];
+	char session_id[SDP_MAX_SESSION_ID_SIZE+1];
+	char session_version[SDP_MAX_SESSION_VERSION_SIZE+1];
+
+	// session name
+	char session_name[SDP_MAX_SESSION_NAME_SIZE+1];
+
+	// time description (mandatory)
+	uint64_t start_time;
+	uint64_t stop_time;
+
+	// session attributes
+	
+	// bundle media identification tags
+	char mid[SDP_MAX_BUNDLE_IDS][SDP_MAX_BUNDLE_ID_SIZE+1];
+	
+	// ice
+	char ufrag[4*256];					// ice-ufrag (256 unicode chars max.)
+	char pwd[4*256];					// ice-pwd (256 unicode chars max.)
+	struct {
+		bool trickle;
+	} ice_options;
+
+	// video media
+	struct {
+		uint16_t port;
+		struct sdp_rtpmap params[SDP_MAX_RTP_PAYLOAD_TYPES];
+		int count;
+	} video;
+
+	sdp_mode_t mode;					// send, receive, and send-and-receive
+
+	bool rtcp_mux;						// is rtcp multiplexed on same socket
+	bool rtcp_rsize;
+
+	union {
+		uint8_t sha256[32];				// certificate fingerprint
+	} fingerprint;
+
+} sdp_t;
+
+
+/**
+ * Parse SDP string into structure
+ *
+ * \param dst[out] SDP structure
+ * \param src[in] NULL-terminated SDP string
+ *
+ * \return 0 on success, negative on error.
+ */
+int sdp_parse(struct sdp *dst, const char *src);
+
+/**
+ * Serialize SDP structure into string
+ *
+ * \param dst[out] NULL-terminated SDP string
+ * \param len[in] Capacity of dst
+ * \param src[in] SDP structure
+ *
+ * \return 0 on success, negative on error.
+ */
+int sdp_serialize(char *dst, size_t len, const struct sdp *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URTC_SDP_H */
diff --git a/src/urtc.c b/src/urtc.c
new file mode 100644
index 0000000..892b632
--- /dev/null
+++ b/src/urtc.c
@@ -0,0 +1,441 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>						// assert
+#include <errno.h>						// errno
+#include <poll.h>						// poll
+#include <pthread.h>					// pthread_create
+#include <stdbool.h>					// true
+#include <stdio.h>						// fprintf
+#include <stdlib.h>						// calloc, free
+#include <string.h>						// strerror
+#include <unistd.h>						// close
+
+#include <arpa/inet.h>					// inet_ntoa
+#include <netinet/in.h>					// IPPROTO_UDP
+#include <sys/socket.h>					// socket
+#include <sys/types.h>
+
+#include "err.h"
+#include "log.h"
+#include "mdns.h"						// mdns_subscribe, mdns_unsubscribe
+#include "prng.h"						// prng_init
+#include "sdp.h"
+#include "urtc.h"
+#include "uuid.h"						// uuid_create_str
+
+#define  RX_BUF_CAP               2048  // receive buffer capacity
+
+#define  POLL_TIMEOUT_MS            50  // poll() timeout (in milliseconds)
+
+enum signaling_state {
+	SIGNALING_STATE_STABLE = 0,
+	SIGNALING_STATE_HAVE_LOCAL_OFFER,
+	SIGNALING_STATE_HAVE_REMOTE_OFFER,
+	SIGNALING_STATE_HAVE_LOCAL_PRANSWER,
+	SIGNALING_STATE_HAVE_REMOTE_PRANSWER,
+};
+
+enum rtc_state {
+	STATE_NEW = 0,
+
+	STATE_ICE_NEW,
+	STATE_ICE_GATHERING,
+	STATE_ICE_COMPLETE,
+
+	STATE_CONNECTING,
+
+	STATE_CONNECTED,
+
+	STATE_DISCONNECTED,
+
+	STATE_FAILED,
+
+	STATE_CLOSED,
+
+	NUM_STATES // must be last
+};
+
+enum rtc_event {
+	EVENT_SOCKET = 0,
+	EVENT_TIMER,
+	EVENT_MDNS,
+	NUM_EVENTS, // must be last
+};
+
+struct peerconn {
+	// socket file descriptor
+	int sockfd;
+
+	// execution thread
+	pthread_t thread;
+
+	// poll file descriptors
+	struct pollfd fds[NUM_EVENTS];
+
+	// callbacks
+	urtc_on_ice_candidate *on_ice_candidate;
+	urtc_force_idr *force_idr;
+
+	// stun servers
+	const char **stun;
+
+	// state machine
+	enum signaling_state ss;
+
+	// local and remote descriptions
+	struct sdp ldesc, rdesc;
+
+	// mDNS related state
+	struct {
+		char hostname[UUID_STR_LEN];	// .local hostname
+		int  sockfd;					// port 5353 listener
+	} mdns;
+};
+
+
+typedef int (*event_handler)(struct peerconn *pc);
+
+const enum rtc_state state_table[NUM_STATES][NUM_EVENTS] = {
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW },
+	{ STATE_NEW, STATE_NEW }
+};
+
+/**
+ * Handle incoming STUN packet
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int stun_handler(
+	struct peerconn *pc,
+	const uint8_t *pkt,
+	size_t n
+) {
+	return 0;
+}
+
+/**
+ * Handle incoming DTLS packet
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int dtls_handler(
+	struct peerconn *pc,
+	const uint8_t *pkt,
+	size_t n
+) {
+	return 0;
+}
+
+/**
+ * Handle incoming SRTP (or SRTCP) packet
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int rtp_handler(
+	struct peerconn *pc,
+	const uint8_t *pkt,
+	size_t n
+) {
+	return 0;
+}
+
+/**
+ * Handle incoming packet
+ *
+ * Packet may be a DTLS, SRTP, SRTCP, or STUN packet. Other packet types
+ * are discarded.
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int socket_event_handler(struct peerconn *pc) {
+	uint8_t buffer[RX_BUF_CAP];
+	struct sockaddr_in ra;
+	socklen_t ralen;
+	ssize_t n;
+
+	// read packet
+	ralen = sizeof(ra);
+	n = recvfrom(
+		pc->sockfd,
+		buffer,
+		sizeof(buffer),
+		0,
+		(struct sockaddr *)(&ra),
+		&ralen
+	);
+
+	// rtp
+	if ((127 < buffer[0]) && (buffer[0] < 192)) {
+		log(INFO, "[rtp] %s", inet_ntoa(ra.sin_addr));
+		rtp_handler(pc, buffer, n);
+	} else
+	// dtls
+	if ((19 < buffer[0]) && (buffer[0] < 64)) {
+		log(INFO, "[dtls] %s", inet_ntoa(ra.sin_addr));
+		dtls_handler(pc, buffer, n);
+	} else
+	// stun
+	if (buffer[0] < 2) {
+		log(INFO, "[stun] %s", inet_ntoa(ra.sin_addr));
+		stun_handler(pc, buffer, n);
+	}
+
+	return 0;
+}
+
+/**
+ * Handle timer event
+ *
+ * May need to:
+ * - resend STUN packet
+ * - resend DTLS packet
+ * - expire ICE candidate?
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int timer_event_handler(struct peerconn *pc) {
+	return 0;
+}
+
+/**
+ * Handle incoming mDNS query
+ *
+ * \param pc Peer connection.
+ *
+ * \return 0 on success, negative on error.
+ */
+static int mdns_handler(struct peerconn *pc) {
+	uint8_t buffer[RX_BUF_CAP];
+	ssize_t n;
+
+	// read packet
+	if (n = recvfrom(
+		pc->mdns.sockfd,
+		buffer,
+		sizeof(buffer),
+		0,
+		NULL,
+		NULL
+	), -1 == n) {
+		log(ERROR, "%s", strerror(errno));
+		goto _fail_recvfrom;
+	}
+
+	// if valid query for peer connection's ephemeral hostname...
+	int type = mdns_validate_query(buffer, n, pc->mdns.hostname);
+	if (type > 0) {
+		if (type | TYPE_A) {
+			log(DEBUG, "[mdns] received A query");
+			// ...respond to query with interface addresses
+			mdns_send_response(pc->mdns.sockfd, pc->mdns.hostname);
+		}
+		if (type | TYPE_AAAA) {
+			log(DEBUG, "[mdns] received AAAA query");
+		}
+	}
+
+	return 0;
+
+_fail_recvfrom:
+	return -URTC_ERR;
+}
+
+const event_handler action_table[NUM_STATES][NUM_EVENTS] = {
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL },
+	{ NULL, NULL, NULL }
+};
+
+/**
+ * Runloop finite state machine (mealy) for handling timer and receive events
+ */
+
+// send stun request
+// wait for stun reply
+// 		timeout -> resend request
+
+// called							dir			caller
+// ------							---			------
+// setRemoteDescription(offer)		<--			offer = createOffer()
+// 												setLocalDescription(offer)
+// answer = createAnswer()			-->			setRemoteDescription(answer)
+// setLocalDescription(answer)
+//
+// cand = onIceCandidate			-->			addIceCandidate(cand)
+// addIceCandidate(cand)			<--			cand = onIceCandidate
+// 									...
+//
+//                       (connection established)
+//
+//                           (dtls handshake)
+//
+// srtp -->
+// <-- rtcp, nack
+
+/**
+ * Execution thread per peer connection
+ *
+ * \param arg Peer connection
+ *
+ * \return Unused.
+ */
+static void * runloop(void *arg) {
+	struct peerconn *pc;
+	enum rtc_event event;
+	int n;
+
+	pc = (struct peerconn *)arg;
+	assert(pc);
+
+_loop:
+	// block indefinitely (-1 timeout) until i/o event
+	n = poll(pc->fds, NUM_EVENTS, -1);
+	assert(n > 0);
+
+	// which event(s) occurred?
+	if (pc->fds[EVENT_SOCKET].revents & POLLIN) {
+		event = EVENT_SOCKET;
+	} else
+	if (pc->fds[EVENT_MDNS].revents & POLLIN) {
+		mdns_handler(pc);
+	} else
+	if (pc->fds[EVENT_TIMER].revents & POLLIN) {
+		event = EVENT_TIMER;
+	}
+
+	goto _loop;
+
+
+	return NULL;
+};
+
+urtc_peerconn_t * urtc_peerconn_create(const char *stun[]) {
+	// seend pseudorandom number generator
+	prng_init();
+
+	// allocate peer connection
+	struct peerconn *pc = (struct peerconn *)calloc(1, sizeof(struct peerconn));
+	if (!pc) return pc;
+
+	// copy pointer to stun servers
+	pc->stun = stun;
+
+	// open udp socket (for all dtls/srtp/srtcp/stun/turn communication)
+	pc->sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (-1 == pc->sockfd) goto _fail_socket;
+	pc->fds[EVENT_SOCKET] = (struct pollfd){ pc->sockfd, POLLIN };
+
+	// generate a unique local mDNS hostname
+	uuid_create_str(pc->mdns.hostname);
+	log(INFO, "mDNS hostname is %s.local", pc->mdns.hostname);
+
+	// open multicast udp socket for replying to mDNS queries
+	pc->mdns.sockfd = mdns_subscribe();
+	if (-1 == pc->mdns.sockfd) goto _fail_mdns_subscribe;
+	pc->fds[EVENT_MDNS] = (struct pollfd){
+		pc->mdns.sockfd,
+		POLLIN
+	};
+
+	// start new thread per peer connection
+	if (0 != pthread_create(
+		&(pc->thread), 
+		NULL,
+		runloop,
+		pc
+	)) goto _fail_pthread_create;
+
+	return pc;
+
+_fail_pthread_create:
+	mdns_unsubscribe(pc->mdns.sockfd);
+_fail_mdns_subscribe:
+	close(pc->sockfd);
+_fail_socket:
+	free(pc);
+
+	return NULL;
+}
+
+int urtc_set_on_ice_candidate(struct peerconn *pc, urtc_on_ice_candidate *cb) {
+	if (!pc) return -1;
+	if (!cb) return -1;
+	pc->on_ice_candidate = cb;
+
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+int urtc_add_ice_candidate(struct peerconn *pc, const char *cand) {
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+int urtc_create_answer(struct peerconn *pc, char **answer) {
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+int urtc_create_offer(struct peerconn *pc, char **offer) {
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+int urtc_set_remote_description(struct peerconn *pc, const char *desc) {
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+int urtc_set_local_description(struct peerconn *pc, const char *desc) {
+	return -URTC_ERR_NOT_IMPLEMENTED;
+}
+
+void urtc_peerconn_destroy(struct peerconn *pc) {
+	if (pc) {
+		pthread_cancel(pc->thread);
+		pthread_join(pc->thread, NULL);
+		mdns_unsubscribe(pc->mdns.sockfd);
+		shutdown(pc->sockfd, SHUT_RDWR);
+		close(pc->sockfd);
+		free(pc);
+	}
+}
diff --git a/src/urtc.h b/src/urtc.h
new file mode 100644
index 0000000..3da0947
--- /dev/null
+++ b/src/urtc.h
@@ -0,0 +1,223 @@
+/**
+ * \file urtc.h
+ *
+ * \brief liburtc header file.
+ *
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * \mainpage notitle
+ *
+ * The reference WebRTC implementation, libwebrtc, was developed by Google
+ * for the Chrome web browser. It's codebase is large (over 10GB of source),
+ * uses uncommon build tools (Bazel), and produces large executables not
+ * well suited for constrained embedded devices.
+ *
+ * liburtc is designed with embedded devices in mind. Only functionality
+ * commonly found on embedded devices is implemented. For example, only
+ * the H.264 video codec is supported (there is no VP8/VP9 support) as
+ * most embedded devices with hardware-accelerated video encoders only
+ * support H.264.
+ *
+ * \section features_sec Features
+ * * Small footprint (< 100KB binary)
+ * * H.264 support only (no VP8/9 support)
+ * * ANSI C99
+ *
+ */
+#ifndef _URTC_H
+#define _URTC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Opque peer connection structure.
+ *
+ * Instantiate via urtc_peerconn_create(). Each peer connection creates its
+ * own single thread for processing events in a runloop.
+ */
+typedef struct peerconn urtc_peerconn_t;
+
+/**
+ * (callback) Called for each new local ICE candidate discovered
+ *
+ * The local candidate should be relayed to the remote peer. Note that callback
+ * executes on peer connection event loop -- do not block or do other expensive
+ * work within the callback.
+ *
+ * Akin to the `onicecandidate` event handler in `RTCPeerConnection`.
+ *
+ * \param cand Discovered local candidate string.
+ * \param arg User specified argument, see urtc_set_on_ice_candidate().
+ *
+ * \return 0 on success, negative on error.
+ */
+typedef int (urtc_on_ice_candidate)(const char *cand, void *arg);
+
+/**
+ * (callback) Called to request that video encoder immediately generate an IDR
+ *
+ * H.264 video encoders produce I-frames and P-frames. Only I-frames can be
+ * decoded independently. To minimize the time-to-first-frame (TTFF), an
+ * I-frame should be sent as soon as a peer connection is established. In the
+ * event of picture loss, an I-frame should be sent as soon as possible to
+ * re-establish picture.
+ *
+ * This is an optional callback. If set, it improves the TTFF and picture
+ * recovery time from loss of picture.
+ */
+typedef void (urtc_force_idr)();
+
+
+/**
+ * Create a new peer connection
+ *
+ * Note that the new peer connection is not yet connected to a peer.
+ *
+ * Akin to `RTCPeerConnection()` in the WebRTC JS API.
+ *
+ * \param stun Array of STUN servers to use for discovery of server-reflexive
+ *             ICE candidates. Each entry should be a string of the form
+ *             `hostname[:port]` (e.g. "stun.l.google.com:19302"). The port
+ *             is optional -- if omitted, 3478 is assumed. The final entry in
+ *             the array must be NULL. If no STUN servers are provided, only
+ *             local area network peers will be discoverable.
+ *
+ * \return On success, a pointer to new peer connection object is returned.
+ *		The peer connection must be destroyed with urtc_peerconn_destroy()
+ *		when no longer needed. On error, NULL is returned.
+ */
+urtc_peerconn_t * urtc_peerconn_create(const char *stun[]);
+
+/**
+ * Sets onIceCandidate callback function
+ *
+ * Callback function will be called when a new local ICE candidate is
+ * discovered.
+ */
+int urtc_set_on_ice_candidate(urtc_peerconn_t *pc, urtc_on_ice_candidate *cb);
+
+/**
+ * Adds received remote ICE candidate to peer connection
+ *
+ * For each ICE candidate received from the remote peer via some external
+ * signaling channel, use this function to add the candidate to the peer
+ * connection. Candidates are asynchronously used to check for direct
+ * peer-to-peer connectivity with the remote peer.
+ *
+ * Akin to `addIceCandidate` method of `RTCPeerConnection` in the WebRTC JS API.
+ *
+ * \param pc Peer connection.
+ * \param cand An ICE candidate string from remote peer.
+ *
+ * \return 0 on success, negative on error.
+ */
+int urtc_add_ice_candidate(urtc_peerconn_t *pc, const char *cand);
+
+/**
+ * Creates local description for an answering peer connection
+ *
+ * When a peer connection is the answering party, generates a local
+ * description (in Session Description Protocol). This description
+ * should be both sent to remote peer connection via some external
+ * signaling channel as well as added to the local peer connection via
+ * urtc_set_local_description().
+ *
+ * Akin to `createAnswer` method of `RTCPeerConnection` in WebRTC JS API.
+ *
+ * \param pc Peer connection
+ * \param answer Pointer to string pointer pointing to generated answer.
+ *               Memory internally managed (caller need not and must not free).
+ *
+ * \return 0 on success, negative on error.
+ */
+int urtc_create_answer(urtc_peerconn_t *pc, char **answer);
+
+/**
+ * Creates a local description for an offering peer connection
+ *
+ * When a peer connection is the offering party, this function generates a
+ * local description (in Session Description Protocol). This description
+ * should be both sent to the remote peer connection via some external
+ * signaling channel as well as added to the local peer connection via
+ * urtc_set_local_description().
+ *
+ * Akin to `createOffer` method of `RTCPeerConnection` in WebRTC JS API.
+ *
+ * \param pc Peer connection
+ * \param offer Pointer to string pointer pointing to generated offer.
+ *              Memory interally managed (caller need no and must not free).
+ *
+ * \return 0 on success, negative on error.
+ */
+int urtc_create_offer(urtc_peerconn_t *pc, char **offer);
+
+/**
+ * Sets local description for peer connection
+ *
+ * The local description is a Session Description Protocol string, typically
+ * generated by urtc_create_offer() or urtc_create_answer(), depending on
+ * whether the local peer connection is the offering or answering party,
+ * respectively. Setting the local description begins local ICE candidate
+ * discovery.
+ *
+ * Akin to `setLocalDescription` method of `RTCPeerConnection` in WebRTC JS API.
+ *
+ * \param pc Peer connection previously created via urtc_peerconn_create().
+ * \param desc Local description in Session Description Protocol (SDP)
+ *
+ * \return 0 on success, negative on error.
+ */
+int urtc_set_local_description(urtc_peerconn_t *pc, const char *desc);
+
+/**
+ * Sets remote description
+ *
+ * The remote description is a Session Description Protocol string,
+ * received from the remote peer via some external signaling channel.
+ * Amongst other things, it defines the set of media codecs the remote
+ * peer supports.
+ *
+ * Akin to `setRemoteDescription` method of `RTCPeerConnection` in WebRTC JS
+ * API.
+ *
+ * \param pc Peer connection created by urtc_peerconn_create().
+ * \param desc Session description protocol.
+ *
+ * \return 0 on success, negative on error.
+ */
+int urtc_set_remote_description(urtc_peerconn_t *pc, const char *desc);
+
+/**
+ * Tears down peer connection, closing and freeing all resources
+ *
+ * \param pc Peer connection.
+ */
+void urtc_peerconn_destroy(urtc_peerconn_t *pc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URTC_H */
diff --git a/src/uuid.c b/src/uuid.c
new file mode 100644
index 0000000..6dfa4c1
--- /dev/null
+++ b/src/uuid.c
@@ -0,0 +1,76 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * Pseudo-random univerally-unique identifier generator [^RFC4122].
+ *
+ * [^RFC4122]: https://tools.ietf.org/html/rfc4122#section-4.4
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "prng.h"
+#include "uuid.h"
+
+/**
+ * Generate a pseudo-random UUID.
+ *
+ * \return Populated UUID.
+ */
+struct uuid uuid_create() {
+	struct uuid u;
+
+	// fill with randomness
+	prng(&u, sizeof(u));
+
+	// set reserved and version bits
+	u.clk_seq_hi_and_reserved = (u.clk_seq_hi_and_reserved & 0x3F) | 0x80;
+	u.time_hi_and_version = (u.time_hi_and_version & 0x0FFF) | 0x4000;
+
+	return u;
+}
+
+/**
+ * Generate pseudorandom UUID (as a string)
+ *
+ * \param s Destination string memory.
+ *
+ */
+void uuid_create_str(char s[UUID_STR_LEN]) {
+	struct uuid u = uuid_create();
+
+	sprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+		u.time_low,
+		u.time_mid,
+		u.time_hi_and_version,
+		u.clk_seq_hi_and_reserved,
+		u.clk_seq_low,
+		u.node[0],
+		u.node[1],
+		u.node[2],
+		u.node[3],
+		u.node[4],
+		u.node[5]
+	);
+}
diff --git a/src/uuid.h b/src/uuid.h
new file mode 100644
index 0000000..464f33e
--- /dev/null
+++ b/src/uuid.h
@@ -0,0 +1,54 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_UUID_H
+#define _URTC_UUID_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define UUID_SIZE sizeof(struct uuid)
+
+#define UUID_STR_LEN (32 + 4 + 1) // 16 hex octets, 4 dashes, 1 null terminator
+
+struct __attribute__((__packed__)) uuid {
+	uint32_t time_low;
+	uint16_t time_mid;
+	uint16_t time_hi_and_version;
+	uint8_t clk_seq_hi_and_reserved;
+	uint8_t clk_seq_low;
+	uint8_t node[6];
+};
+
+struct uuid uuid_create();
+
+void uuid_create_str(char uuid[UUID_STR_LEN]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _URTC_UUID_H
diff --git a/tests/Makefile.am b/tests/Makefile.am
new file mode 100644
index 0000000..27ebf83
--- /dev/null
+++ b/tests/Makefile.am
@@ -0,0 +1,32 @@
+# Build test programs (run with 'make check')
+TESTS = $(check_PROGRAMS)
+check_PROGRAMS = \
+	g711_test \
+	mdns_test \
+	sdp_test \
+	uuid_test
+
+g711_test_CFLAGS = -I$(top_srcdir)/src
+g711_test_SOURCES = \
+	g711_test.c \
+	$(top_srcdir)/src/g711.c \
+	$(top_srcdir)/src/g711_tables.c
+g711_test_LDADD = $(top_builddir)/src/liburtc.la
+
+mdns_test_CFLAGS = -I$(top_srcdir)/src
+mdns_test_SOURCES = \
+	mdns_test.c \
+	$(top_srcdir)/src/mdns.c
+mdns_test_LDADD = $(top_builddir)/src/liburtc.la
+
+sdp_test_CFLAGS = -I$(top_srcdir)/src
+sdp_test_SOURCES = \
+	sdp_test.c \
+	$(top_srcdir)/src/sdp.c
+sdp_test_LDADD = $(top_builddir)/src/liburtc.la
+
+uuid_test_CFLAGS = -I$(top_srcdir)/src
+uuid_test_SOURCES = \
+	uuid_test.c \
+	$(top_srcdir)/src/uuid.c
+uuid_test_LDADD = $(top_builddir)/src/liburtc.la
diff --git a/tests/g711_test.c b/tests/g711_test.c
new file mode 100644
index 0000000..2e6aa53
--- /dev/null
+++ b/tests/g711_test.c
@@ -0,0 +1,53 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "g711.h"
+
+
+int main(int argc, char **argv) {
+
+	{
+		const int16_t src[] = {
+			0,
+			4096,
+			8192,
+			-8192,
+			-4096
+		};
+		uint8_t dst[sizeof(src) / sizeof(int16_t)];
+		g711_encode(dst, src, sizeof(src) / sizeof(int16_t));
+	}
+
+	{
+		const uint8_t src[] = {
+			0x00,
+			0x7f,
+			0x80,
+			0xff,
+		};
+		int16_t dst[sizeof(src) / sizeof(uint8_t)];
+		g711_decode(dst, src, sizeof(src) / sizeof(uint8_t));
+	}
+
+	return 0;
+}
diff --git a/tests/mdns_test.c b/tests/mdns_test.c
new file mode 100644
index 0000000..8604696
--- /dev/null
+++ b/tests/mdns_test.c
@@ -0,0 +1,66 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include "mdns.h"
+
+const uint8_t response[] = {
+	// header
+	0x00, 0x00, // transaction id
+	0x84, 0x00, // flags
+	0x00, 0x01, // questions
+	0x00, 0x02, // answer RRs
+	0x00, 0x00, // authority RRs
+	0x00, 0x00, // additional RRs
+
+	// query
+	0x07, 0x6c, 0x69, 0x62, 0x75, 0x72, 0x74, 0x63, // "liburtc"
+	0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c, // "local"
+	0x00, // root record
+	0x00, 0xff, // type: any
+	0x80, 0x01, // class: unicast | in(ternet)
+
+	// answer
+	0xc0, 0x0c, // name
+	0x00, 0x1c, // type: AAAA
+	0x00, 0x01, // class: in(ternet)
+	0x00, 0x00, 0x00, 0x0a, // ttl
+	0x00, 0x10, // size
+	0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // IPv6
+	0x72, 0x85, 0xc2, 0xff, 0xfe, 0x07, 0x1f, 0x03, // IPv6 (continued)
+
+	// answer
+	0xc0, 0x0c, // name
+	0x00, 0x01, // type: A
+	0x00, 0x01, // class: in(ternet)
+	0x00, 0x00, 0x00, 0x0a, // ttl
+	0x00, 0x04, // size
+	0xc0, 0xa8, 0x01, 0x64 // IPv4
+};
+
+int main(int argc, char **argv) {
+	assert(0 == mdns_parse_response(response, sizeof(response)));
+	return 0;
+}
diff --git a/tests/sdp_test.c b/tests/sdp_test.c
new file mode 100644
index 0000000..c5c210c
--- /dev/null
+++ b/tests/sdp_test.c
@@ -0,0 +1,328 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "err.h"
+#include "sdp.h"
+
+// Chrome 73.0.3683.103 (Official Build) (64-bit)
+const char *chrome =
+	"v=0\n"
+	"o=- 2136573259711410686 2 IN IP4 127.0.0.1\n"
+	"s=-\n"
+	"t=0 0\n"
+	"a=group:BUNDLE 0\n"
+	"a=msid-semantic: WMS\n"
+	"m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 122 127 121 125 107 108 109 124 120 123 119 114 115 116\n"
+	"c=IN IP4 0.0.0.0\n"
+	"a=rtcp:9 IN IP4 0.0.0.0\n"
+	"a=ice-ufrag:DPkQ\n"
+	"a=ice-pwd:23oU5vsiyBKLHbND/Ql8f7gZ\n"
+	"a=ice-options:trickle\n"
+	"a=fingerprint:sha-256 D0:44:DF:68:71:39:56:0B:D3:61:7A:F2:42:5B:1B:0A:CD:B2:72:84:3A:DE:0F:22:CA:8C:B0:06:0A:8D:A2:00\n"
+	"a=setup:actpass\n"
+	"a=mid:0\n"
+	"a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n"
+	"a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\n"
+	"a=extmap:4 urn:3gpp:video-orientation\n"
+	"a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\n"
+	"a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay\n"
+	"a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type\n"
+	"a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/video-timing\n"
+	"a=extmap:10 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07\n"
+	"a=extmap:12 http://www.webrtc.org/experiments/rtp-hdrext/color-space\n"
+	"a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\n"
+	"a=extmap:13 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\n"
+	"a=extmap:14 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id\n"
+	"a=recvonly\n"
+	"a=rtcp-mux\n"
+	"a=rtcp-rsize\n"
+	"a=rtpmap:96 VP8/90000\n"
+	"a=rtcp-fb:96 goog-remb\n"
+	"a=rtcp-fb:96 transport-cc\n"
+	"a=rtcp-fb:96 ccm fir\n"
+	"a=rtcp-fb:96 nack\n"
+	"a=rtcp-fb:96 nack pli\n"
+	"a=rtpmap:97 rtx/90000\n"
+	"a=fmtp:97 apt=96\n"
+	"a=rtpmap:98 VP9/90000\n"
+	"a=rtcp-fb:98 goog-remb\n"
+	"a=rtcp-fb:98 transport-cc\n"
+	"a=rtcp-fb:98 ccm fir\n"
+	"a=rtcp-fb:98 nack\n"
+	"a=rtcp-fb:98 nack pli\n"
+	"a=fmtp:98 profile-id=0\n"
+	"a=rtpmap:99 rtx/90000\n"
+	"a=fmtp:99 apt=98\n"
+	"a=rtpmap:100 VP9/90000\n"
+	"a=rtcp-fb:100 goog-remb\n"
+	"a=rtcp-fb:100 transport-cc\n"
+	"a=rtcp-fb:100 ccm fir\n"
+	"a=rtcp-fb:100 nack\n"
+	"a=rtcp-fb:100 nack pli\n"
+	"a=fmtp:100 profile-id=2\n"
+	"a=rtpmap:101 rtx/90000\n"
+	"a=fmtp:101 apt=100\n"
+	"a=rtpmap:102 H264/90000\n"
+	"a=rtcp-fb:102 goog-remb\n"
+	"a=rtcp-fb:102 transport-cc\n"
+	"a=rtcp-fb:102 ccm fir\n"
+	"a=rtcp-fb:102 nack\n"
+	"a=rtcp-fb:102 nack pli\n"
+	"a=fmtp:102 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f\n"
+	"a=rtpmap:122 rtx/90000\n"
+	"a=fmtp:122 apt=102\n"
+	"a=rtpmap:127 H264/90000\n"
+	"a=rtcp-fb:127 goog-remb\n"
+	"a=rtcp-fb:127 transport-cc\n"
+	"a=rtcp-fb:127 ccm fir\n"
+	"a=rtcp-fb:127 nack\n"
+	"a=rtcp-fb:127 nack pli\n"
+	"a=fmtp:127 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f\n"
+	"a=rtpmap:121 rtx/90000\n"
+	"a=fmtp:121 apt=127\n"
+	"a=rtpmap:125 H264/90000\n"
+	"a=rtcp-fb:125 goog-remb\n"
+	"a=rtcp-fb:125 transport-cc\n"
+	"a=rtcp-fb:125 ccm fir\n"
+	"a=rtcp-fb:125 nack\n"
+	"a=rtcp-fb:125 nack pli\n"
+	"a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\n"
+	"a=rtpmap:107 rtx/90000\n"
+	"a=fmtp:107 apt=125\n"
+	"a=rtpmap:108 H264/90000\n"
+	"a=rtcp-fb:108 goog-remb\n"
+	"a=rtcp-fb:108 transport-cc\n"
+	"a=rtcp-fb:108 ccm fir\n"
+	"a=rtcp-fb:108 nack\n"
+	"a=rtcp-fb:108 nack pli\n"
+	"a=fmtp:108 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f\n"
+	"a=rtpmap:109 rtx/90000\n"
+	"a=fmtp:109 apt=108\n"
+	"a=rtpmap:124 H264/90000\n"
+	"a=rtcp-fb:124 goog-remb\n"
+	"a=rtcp-fb:124 transport-cc\n"
+	"a=rtcp-fb:124 ccm fir\n"
+	"a=rtcp-fb:124 nack\n"
+	"a=rtcp-fb:124 nack pli\n"
+	"a=fmtp:124 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d0032\n"
+	"a=rtpmap:120 rtx/90000\n"
+	"a=fmtp:120 apt=124\n"
+	"a=rtpmap:123 H264/90000\n"
+	"a=rtcp-fb:123 goog-remb\n"
+	"a=rtcp-fb:123 transport-cc\n"
+	"a=rtcp-fb:123 ccm fir\n"
+	"a=rtcp-fb:123 nack\n"
+	"a=rtcp-fb:123 nack pli\n"
+	"a=fmtp:123 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640032\n"
+	"a=rtpmap:119 rtx/90000\n"
+	"a=fmtp:119 apt=123\n"
+	"a=rtpmap:114 red/90000\n"
+	"a=rtpmap:115 rtx/90000\n"
+	"a=fmtp:115 apt=114\n"
+	"a=rtpmap:116 ulpfec/90000\n";
+
+// Safari 13.1 (14609.1.20.111.8)
+const char *safari =
+	"v=0\n"
+	"o=- 3389190485417077944 2 IN IP4 127.0.0.1\n"
+	"s=-\n"
+	"t=0 0\n"
+	"a=group:BUNDLE 0\n"
+	"a=msid-semantic: WMS\n"
+	"m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 127 125 104\n"
+	"c=IN IP4 0.0.0.0\n"
+	"a=rtcp:9 IN IP4 0.0.0.0\n"
+	"a=ice-ufrag:yMtQ\n"
+	"a=ice-pwd:92GWQlqPVFfVjlxV2qSlQxEq\n"
+	"a=ice-options:trickle\n"
+	"a=fingerprint:sha-256 D7:41:A3:34:FC:54:27:FD:D1:2A:58:1D:9E:01:8A:C8:A9:F3:E0:BE:66:B3:D9:58:FC:7D:59:A7:BA:D6:99:F3\n"
+	"a=setup:actpass\n"
+	"a=mid:0\n"
+	"a=extmap:14 urn:ietf:params:rtp-hdrext:toffset\n"
+	"a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\n"
+	"a=extmap:13 urn:3gpp:video-orientation\n"
+	"a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\n"
+	"a=extmap:12 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay\n"
+	"a=extmap:11 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type\n"
+	"a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing\n"
+	"a=extmap:8 http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07\n"
+	"a=extmap:9 http://www.webrtc.org/experiments/rtp-hdrext/color-space\n"
+	"a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid\n"
+	"a=extmap:5 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\n"
+	"a=extmap:6 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id\n"
+	"a=sendrecv\n"
+	"a=msid:- d770ebc2-b725-4de0-8314-a76a8a67695e\n"
+	"a=rtcp-mux\n"
+	"a=rtcp-rsize\n"
+	"a=rtpmap:96 H264/90000\n"
+	"a=rtcp-fb:96 goog-remb\n"
+	"a=rtcp-fb:96 transport-cc\n"
+	"a=rtcp-fb:96 ccm fir\n"
+	"a=rtcp-fb:96 nack\n"
+	"a=rtcp-fb:96 nack pli\n"
+	"a=fmtp:96 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640c1f\n"
+	"a=rtpmap:97 rtx/90000\n"
+	"a=fmtp:97 apt=96\n"
+	"a=rtpmap:98 H264/90000\n"
+	"a=rtcp-fb:98 goog-remb\n"
+	"a=rtcp-fb:98 transport-cc\n"
+	"a=rtcp-fb:98 ccm fir\n"
+	"a=rtcp-fb:98 nack\n"
+	"a=rtcp-fb:98 nack pli\n"
+	"a=fmtp:98 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\n"
+	"a=rtpmap:99 rtx/90000\n"
+	"a=fmtp:99 apt=98\n"
+	"a=rtpmap:100 VP8/90000\n"
+	"a=rtcp-fb:100 goog-remb\n"
+	"a=rtcp-fb:100 transport-cc\n"
+	"a=rtcp-fb:100 ccm fir\n"
+	"a=rtcp-fb:100 nack\n"
+	"a=rtcp-fb:100 nack pli\n"
+	"a=rtpmap:101 rtx/90000\n"
+	"a=fmtp:101 apt=100\n"
+	"a=rtpmap:127 red/90000\n"
+	"a=rtpmap:125 rtx/90000\n"
+	"a=fmtp:125 apt=127\n"
+	"a=rtpmap:104 ulpfec/90000\n"
+	"a=ssrc-group:FID 737915040 1139142965\n"
+	"a=ssrc:737915040 cname:uGvMyunFXUYJjCuf\n"
+	"a=ssrc:737915040 msid:- d770ebc2-b725-4de0-8314-a76a8a67695e\n"
+	"a=ssrc:737915040 mslabel:-\n"
+	"a=ssrc:737915040 label:d770ebc2-b725-4de0-8314-a76a8a67695e\n"
+	"a=ssrc:1139142965 cname:uGvMyunFXUYJjCuf\n"
+	"a=ssrc:1139142965 msid:- d770ebc2-b725-4de0-8314-a76a8a67695e\n"
+	"a=ssrc:1139142965 mslabel:-\n"
+	"a=ssrc:1139142965 label:d770ebc2-b725-4de0-8314-a76a8a67695e\n";
+
+int main(int argc, char **argv) {
+
+	// Test SDP deserialize
+	{
+		sdp_t sdp;
+		assert(-URTC_ERR_BAD_ARGUMENT == sdp_parse(&sdp, NULL));
+		assert(0 == sdp_parse(&sdp, ""));
+	}
+
+	{
+		sdp_t sdp;
+		assert(0 == sdp_parse(&sdp, chrome));
+		assert(0 == sdp.version);
+		assert(0 == sdp.start_time);
+		assert(0 == sdp.stop_time);
+
+	}
+
+	// Test parser against Chrome offer
+	{
+		sdp_t sdp;
+		assert(0 == sdp_parse(&sdp, chrome));
+		assert(0 == sdp.version);
+		assert(0 == strcmp("-", sdp.username));
+		assert(0 == strcmp("2136573259711410686", sdp.session_id));
+		assert(0 == strcmp("2", sdp.session_version));
+		assert(0 == sdp.start_time);
+		assert(0 == sdp.stop_time);
+		{
+			assert(21 == sdp.video.count);
+			assert(9 == sdp.video.port);
+			unsigned int expected_type[] = {
+				96,  97,  98,  99,  100, 101, 102, 122, 127, 121,
+				125, 107, 108, 109, 124, 120, 123, 119, 114, 115,
+				116
+			};
+			for (int i = 0; i < sdp.video.count; i++) {
+				assert(expected_type[i] == sdp.video.params[i].type);
+			}
+		}
+		assert(0 == strcmp("DPkQ", sdp.ufrag));
+		assert(0 == strcmp("23oU5vsiyBKLHbND/Ql8f7gZ", sdp.pwd));
+		assert(true == sdp.ice_options.trickle);
+		{
+			uint8_t expected_fingerprint[] = { 
+				0xD0, 0x44, 0xDF, 0x68, 0x71, 0x39, 0x56, 0x0B,
+				0xD3, 0x61, 0x7A, 0xF2, 0x42, 0x5B, 0x1B, 0x0A,
+				0xCD, 0xB2, 0x72, 0x84, 0x3A, 0xDE, 0x0F, 0x22,
+				0xCA, 0x8C, 0xB0, 0x06, 0x0A, 0x8D, 0xA2, 0x00
+			};
+			assert(0 == memcmp(sdp.fingerprint.sha256, expected_fingerprint, 32));
+		}
+		assert(SDP_MODE_RECEIVE_ONLY == sdp.mode);
+		assert(true == sdp.rtcp_mux);
+		assert(true == sdp.rtcp_rsize);
+	}
+
+	// Test parser against Safari offer
+	{
+		sdp_t sdp;
+		assert(0 == sdp_parse(&sdp, safari));
+		assert(0 == sdp.version);
+		assert(0 == strcmp("-", sdp.username));
+		assert(0 == strcmp("3389190485417077944", sdp.session_id));
+		assert(0 == strcmp("2", sdp.session_version));
+		assert(0 == sdp.start_time);
+		assert(0 == sdp.stop_time);
+		{
+			assert(9 == sdp.video.count);
+			assert(9 == sdp.video.port);
+			unsigned int expected_type[] = {
+				96, 97, 98, 99, 100, 101, 127, 125, 104
+			};
+			for (int i = 0; i < sdp.video.count; i++) {
+				assert(expected_type[i] == sdp.video.params[i].type);
+			}
+		}
+		assert(0 == strcmp("yMtQ", sdp.ufrag));
+		assert(0 == strcmp("92GWQlqPVFfVjlxV2qSlQxEq", sdp.pwd));
+		assert(true == sdp.ice_options.trickle);
+		{
+			uint8_t expected_fingerprint[] = { 
+				0xD7, 0x41, 0xA3, 0x34, 0xFC, 0x54, 0x27, 0xFD,
+				0xD1, 0x2A, 0x58, 0x1D, 0x9E, 0x01, 0x8A, 0xC8,
+				0xA9, 0xF3, 0xE0, 0xBE, 0x66, 0xB3, 0xD9, 0x58,
+				0xFC, 0x7D, 0x59, 0xA7, 0xBA, 0xD6, 0x99, 0xF3
+			};
+			assert(0 == memcmp(sdp.fingerprint.sha256, expected_fingerprint, 32));
+		}
+		assert(SDP_MODE_SEND_AND_RECEIVE == sdp.mode);
+		assert(true == sdp.rtcp_mux);
+		assert(true == sdp.rtcp_rsize);
+	}
+
+	// Test SDP serialize
+	{
+		char str[2048];
+		sdp_t sdp = {
+			.ice_options.trickle = true,
+			.rtcp_mux = true
+		};
+		assert(0 == sdp_serialize(str, sizeof(str), &sdp));
+		fprintf(stderr, "%s", str);
+	}
+
+	return 0;
+}
diff --git a/tests/str_test.c b/tests/str_test.c
new file mode 100644
index 0000000..58e6a20
--- /dev/null
+++ b/tests/str_test.c
@@ -0,0 +1,31 @@
+/*
+ * liburtc
+ * Copyright (C) 2019 Chris Hiszpanski
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "string.h"
+
+int main(int argc, char **argv) {
+	{
+		string_t *s = string_create_empty(3);
+		string_append(s, "one");
+		string_append(s, "two");
+		string_append(s, "three");
+		string_destroy(s);
+	}
+
+	return 0;
+}
diff --git a/tests/uuid_test.c b/tests/uuid_test.c
new file mode 100644
index 0000000..a515005
--- /dev/null
+++ b/tests/uuid_test.c
@@ -0,0 +1,45 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+
+#include "uuid.h"
+
+int main(int argc, char **argv) {
+	{
+		char sa[UUID_STR_LEN];
+
+		uuid_create_str(sa);
+
+		assert(sa[ 8] == '-');
+		assert(sa[13] == '-');
+		assert(sa[14] == '4');
+		assert(sa[18] == '-');
+		assert(sa[19] == '8' || sa[19] == '9' ||
+		       sa[19] == 'a' || sa[19] == 'b');
+		assert(sa[23] == '-');
+	}
+
+	return 0;
+}