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diff --git a/src/mdns.h b/src/mdns.h
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+/**
+ * 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