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/**
* Copyright (c) 2019-2021 Chris Hiszpanski. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#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 {
int _;
} 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 */
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