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ice.c
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/*! \file ice.c
* \author Lorenzo Miniero <[email protected]>
* \copyright GNU General Public License v3
* \brief Janus handles and ICE/STUN/TURN processing
* \details A Janus handle represents an abstraction of the communication
* between a user and a specific plugin, within a Janus session. This is
* particularly important in terms of media connectivity, as each handle
* can be associated with a single WebRTC PeerConnection. This code also
* contains the implementation (based on libnice) of a WebRTC PeerConnection.
* The code handles the whole ICE process, from the gathering of candidates
* to the final setup of a virtual channel RTP and RTCP can be transported
* on. Incoming RTP and RTCP packets from peers are relayed to the associated
* plugins by means of the incoming_rtp and incoming_rtcp callbacks. Packets
* to be sent to peers are relayed by peers invoking the relay_rtp and
* relay_rtcp core callbacks instead.
*
* \ingroup protocols
* \ref protocols
*/
#include <ifaddrs.h>
#include <poll.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netdb.h>
#include <fcntl.h>
#include <stun/usages/bind.h>
#include <nice/debug.h>
#include "janus.h"
#include "debug.h"
#include "ice.h"
#include "turnrest.h"
#include "sdp.h"
#include "rtpsrtp.h"
#include "rtcp.h"
#include "apierror.h"
#include "ip-utils.h"
#include "events.h"
/* STUN server/port, if any */
static char *janus_stun_server = NULL;
static uint16_t janus_stun_port = 0;
char *janus_ice_get_stun_server(void) {
return janus_stun_server;
}
uint16_t janus_ice_get_stun_port(void) {
return janus_stun_port;
}
/* TURN server/port and credentials, if any */
static char *janus_turn_server = NULL;
static uint16_t janus_turn_port = 0;
static char *janus_turn_user = NULL, *janus_turn_pwd = NULL;
static NiceRelayType janus_turn_type = NICE_RELAY_TYPE_TURN_UDP;
char *janus_ice_get_turn_server(void) {
return janus_turn_server;
}
uint16_t janus_ice_get_turn_port(void) {
return janus_turn_port;
}
/* TURN REST API support, if any */
char *janus_ice_get_turn_rest_api(void) {
#ifndef HAVE_TURNRESTAPI
return NULL;
#else
return (char *)janus_turnrest_get_backend();
#endif
}
/* Force relay settings */
static gboolean force_relay_allowed = FALSE;
void janus_ice_allow_force_relay(void) {
force_relay_allowed = TRUE;
}
gboolean janus_ice_is_force_relay_allowed(void) {
return force_relay_allowed;
}
/* ICE-Lite status */
static gboolean janus_ice_lite_enabled;
gboolean janus_ice_is_ice_lite_enabled(void) {
return janus_ice_lite_enabled;
}
/* ICE-TCP support (only libnice >= 0.1.8, currently broken) */
static gboolean janus_ice_tcp_enabled;
gboolean janus_ice_is_ice_tcp_enabled(void) {
return janus_ice_tcp_enabled;
}
/* Full-trickle support */
static gboolean janus_full_trickle_enabled;
gboolean janus_ice_is_full_trickle_enabled(void) {
return janus_full_trickle_enabled;
}
/* mDNS resolution support */
static gboolean janus_mdns_enabled;
gboolean janus_ice_is_mdns_enabled(void) {
return janus_mdns_enabled;
}
/* IPv6 support */
static gboolean janus_ipv6_enabled;
static gboolean janus_ipv6_linklocal_enabled;
gboolean janus_ice_is_ipv6_enabled(void) {
return janus_ipv6_enabled;
}
static gboolean janus_ipv6_linklocal_enabled;
gboolean janus_ice_is_ipv6_linklocal_enabled(void) {
return janus_ipv6_linklocal_enabled;
}
#ifdef HAVE_ICE_NOMINATION
/* Since libnice 0.1.15, we can configure the ICE nomination mode: it was
* always "aggressive" before, so we set it to "aggressive" by default as well */
static NiceNominationMode janus_ice_nomination = NICE_NOMINATION_MODE_AGGRESSIVE;
void janus_ice_set_nomination_mode(const char *nomination) {
if(nomination == NULL) {
JANUS_LOG(LOG_WARN, "Invalid ICE nomination mode, falling back to 'aggressive'\n");
} else if(!strcasecmp(nomination, "regular")) {
JANUS_LOG(LOG_INFO, "Configuring Janus to use ICE regular nomination\n");
janus_ice_nomination = NICE_NOMINATION_MODE_REGULAR;
} else if(!strcasecmp(nomination, "aggressive")) {
JANUS_LOG(LOG_INFO, "Configuring Janus to use ICE aggressive nomination\n");
janus_ice_nomination = NICE_NOMINATION_MODE_AGGRESSIVE;
} else {
JANUS_LOG(LOG_WARN, "Unsupported ICE nomination mode '%s', falling back to 'aggressive'\n", nomination);
}
}
const char *janus_ice_get_nomination_mode(void) {
return (janus_ice_nomination == NICE_NOMINATION_MODE_REGULAR ? "regular" : "aggressive");
}
#endif
/* Keepalive via connectivity checks */
static gboolean janus_ice_keepalive_connchecks = FALSE;
void janus_ice_set_keepalive_conncheck_enabled(gboolean enabled) {
janus_ice_keepalive_connchecks = enabled;
if(janus_ice_keepalive_connchecks) {
JANUS_LOG(LOG_INFO, "Using connectivity checks as PeerConnection keep-alives\n");
JANUS_LOG(LOG_WARN, "Notice that the current libnice master is breaking connections after 50s when keepalive-conncheck enabled. As such, better to stick to 0.1.18 until the issue is addressed upstream\n");
}
}
gboolean janus_ice_is_keepalive_conncheck_enabled(void) {
return janus_ice_keepalive_connchecks;
}
/* Opaque IDs set by applications are by default only passed to event handlers
* for correlation purposes, but not sent back to the user or application in
* the related Janus API responses or events, unless configured otherwise */
static gboolean opaqueid_in_api = FALSE;
void janus_enable_opaqueid_in_api(void) {
opaqueid_in_api = TRUE;
}
gboolean janus_is_opaqueid_in_api_enabled(void) {
return opaqueid_in_api;
}
/* Only needed in case we're using static event loops spawned at startup (disabled by default) */
typedef struct janus_ice_static_event_loop {
int id;
GMainContext *mainctx;
GMainLoop *mainloop;
GThread *thread;
uint16_t handles;
volatile gint destroyed;
janus_refcount ref;
} janus_ice_static_event_loop;
static void janus_ice_static_event_loop_destroy(janus_ice_static_event_loop *loop) {
if(!g_atomic_int_compare_and_exchange(&loop->destroyed, 0, 1))
return;
janus_refcount_decrease(&loop->ref);
}
static void janus_ice_static_event_loop_free(const janus_refcount *loop_ref) {
janus_ice_static_event_loop *loop = janus_refcount_containerof(loop_ref, janus_ice_static_event_loop, ref);
g_free(loop);
}
static int static_event_loops = 0;
static gboolean allow_loop_indication = FALSE;
static GSList *event_loops = NULL;
static janus_mutex event_loops_mutex = JANUS_MUTEX_INITIALIZER;
static void *janus_ice_static_event_loop_thread(void *data) {
janus_ice_static_event_loop *loop = data;
JANUS_LOG(LOG_VERB, "[loop#%d] Event loop thread started\n", loop->id);
if(loop->mainloop == NULL) {
JANUS_LOG(LOG_ERR, "[loop#%d] Invalid loop...\n", loop->id);
g_thread_unref(g_thread_self());
janus_refcount_decrease(&loop->ref);
return NULL;
}
JANUS_LOG(LOG_DBG, "[loop#%d] Looping...\n", loop->id);
g_main_loop_run(loop->mainloop);
/* When the loop quits, we can unref it */
g_main_loop_unref(loop->mainloop);
g_main_context_unref(loop->mainctx);
JANUS_LOG(LOG_VERB, "[loop#%d] Event loop thread ended!\n", loop->id);
janus_refcount_decrease(&loop->ref);
return NULL;
}
int janus_ice_get_static_event_loops(void) {
return static_event_loops;
}
gboolean janus_ice_is_loop_indication_allowed(void) {
return allow_loop_indication;
}
void janus_ice_set_static_event_loops(int loops, gboolean allow_api) {
if(loops == 0)
return;
else if(loops < 1) {
JANUS_LOG(LOG_WARN, "Invalid number of static event loops (%d), disabling\n", loops);
return;
}
/* Create a pool of new event loops */
int i = 0;
for(i=0; i<loops; i++) {
janus_ice_static_event_loop *loop = g_malloc0(sizeof(janus_ice_static_event_loop));
loop->id = static_event_loops;
loop->mainctx = g_main_context_new();
loop->mainloop = g_main_loop_new(loop->mainctx, FALSE);
janus_refcount_init(&loop->ref, janus_ice_static_event_loop_free);
/* Now spawn a thread for this loop */
GError *error = NULL;
char tname[16];
g_snprintf(tname, sizeof(tname), "hloop %d", loop->id);
janus_refcount_increase(&loop->ref);
loop->thread = g_thread_try_new(tname, &janus_ice_static_event_loop_thread, loop, &error);
if(error != NULL) {
g_main_loop_unref(loop->mainloop);
g_main_context_unref(loop->mainctx);
janus_refcount_decrease(&loop->ref);
janus_ice_static_event_loop_destroy(loop);
JANUS_LOG(LOG_ERR, "Got error %d (%s) trying to launch a new event loop thread...\n",
error->code, error->message ? error->message : "??");
g_error_free(error);
} else {
event_loops = g_slist_append(event_loops, loop);
static_event_loops++;
}
}
JANUS_LOG(LOG_INFO, "Spawned %d static event loops (handles won't have a dedicated loop)\n", static_event_loops);
allow_loop_indication = allow_api;
JANUS_LOG(LOG_INFO, " -- Janus API %s be able to drive the loop choice for new handles\n",
allow_loop_indication ? "will" : "will NOT");
return;
}
json_t *janus_ice_static_event_loops_info(void) {
json_t *list = json_array();
if(static_event_loops < 1)
return list;
janus_mutex_lock(&event_loops_mutex);
GSList *l = event_loops;
while(l) {
janus_ice_static_event_loop *loop = (janus_ice_static_event_loop *)l->data;
json_t *info = json_object();
json_object_set_new(info, "id", json_integer(loop->id));
json_object_set_new(info, "handles", json_integer(loop->handles));
json_array_append_new(list, info);
l = l->next;
}
janus_mutex_unlock(&event_loops_mutex);
return list;
}
void janus_ice_stop_static_event_loops(void) {
if(static_event_loops < 1)
return;
/* Quit all the static loops and wait for the threads to leave */
janus_mutex_lock(&event_loops_mutex);
GSList *l = event_loops;
while(l) {
janus_ice_static_event_loop *loop = (janus_ice_static_event_loop *)l->data;
if(loop->mainloop != NULL && g_main_loop_is_running(loop->mainloop))
g_main_loop_quit(loop->mainloop);
g_thread_join(loop->thread);
l = l->next;
}
g_slist_free_full(event_loops, (GDestroyNotify)janus_ice_static_event_loop_destroy);
janus_mutex_unlock(&event_loops_mutex);
}
/* libnice debugging */
static gboolean janus_ice_debugging_enabled;
gboolean janus_ice_is_ice_debugging_enabled(void) {
return janus_ice_debugging_enabled;
}
void janus_ice_debugging_enable(void) {
JANUS_LOG(LOG_VERB, "Enabling libnice debugging...\n");
if(g_getenv("NICE_DEBUG") == NULL) {
JANUS_LOG(LOG_WARN, "No NICE_DEBUG environment variable set, setting maximum debug\n");
g_setenv("NICE_DEBUG", "all", TRUE);
}
if(g_getenv("G_MESSAGES_DEBUG") == NULL) {
JANUS_LOG(LOG_WARN, "No G_MESSAGES_DEBUG environment variable set, setting maximum debug\n");
g_setenv("G_MESSAGES_DEBUG", "all", TRUE);
}
JANUS_LOG(LOG_VERB, "Debugging NICE_DEBUG=%s G_MESSAGES_DEBUG=%s\n",
g_getenv("NICE_DEBUG"), g_getenv("G_MESSAGES_DEBUG"));
janus_ice_debugging_enabled = TRUE;
nice_debug_enable(strstr(g_getenv("NICE_DEBUG"), "all") || strstr(g_getenv("NICE_DEBUG"), "stun"));
}
void janus_ice_debugging_disable(void) {
JANUS_LOG(LOG_VERB, "Disabling libnice debugging...\n");
janus_ice_debugging_enabled = FALSE;
nice_debug_disable(TRUE);
}
/* NAT 1:1 stuff */
static gboolean nat_1_1_enabled = FALSE;
static gboolean keep_private_host = FALSE;
void janus_ice_enable_nat_1_1(gboolean kph) {
nat_1_1_enabled = TRUE;
keep_private_host = kph;
}
/* Interface/IP enforce/ignore lists */
GList *janus_ice_enforce_list = NULL, *janus_ice_ignore_list = NULL;
janus_mutex ice_list_mutex;
void janus_ice_enforce_interface(const char *ip) {
if(ip == NULL)
return;
/* Is this an IP or an interface? */
janus_mutex_lock(&ice_list_mutex);
janus_ice_enforce_list = g_list_append(janus_ice_enforce_list, (gpointer)ip);
janus_mutex_unlock(&ice_list_mutex);
}
gboolean janus_ice_is_enforced(const char *ip) {
if(ip == NULL || janus_ice_enforce_list == NULL)
return false;
janus_mutex_lock(&ice_list_mutex);
GList *temp = janus_ice_enforce_list;
while(temp) {
const char *enforced = (const char *)temp->data;
if(enforced != NULL && strstr(ip, enforced) == ip) {
janus_mutex_unlock(&ice_list_mutex);
return true;
}
temp = temp->next;
}
janus_mutex_unlock(&ice_list_mutex);
return false;
}
void janus_ice_ignore_interface(const char *ip) {
if(ip == NULL)
return;
/* Is this an IP or an interface? */
janus_mutex_lock(&ice_list_mutex);
janus_ice_ignore_list = g_list_append(janus_ice_ignore_list, (gpointer)ip);
if(janus_ice_enforce_list != NULL) {
JANUS_LOG(LOG_WARN, "Added %s to the ICE ignore list, but the ICE enforce list is not empty: the ICE ignore list will not be used\n", ip);
}
janus_mutex_unlock(&ice_list_mutex);
}
gboolean janus_ice_is_ignored(const char *ip) {
if(ip == NULL || janus_ice_ignore_list == NULL)
return false;
janus_mutex_lock(&ice_list_mutex);
GList *temp = janus_ice_ignore_list;
while(temp) {
const char *ignored = (const char *)temp->data;
if(ignored != NULL && strstr(ip, ignored) == ip) {
janus_mutex_unlock(&ice_list_mutex);
return true;
}
temp = temp->next;
}
janus_mutex_unlock(&ice_list_mutex);
return false;
}
/* Frequency of statistics via event handlers (one second by default) */
static int janus_ice_event_stats_period = 1;
void janus_ice_set_event_stats_period(int period) {
janus_ice_event_stats_period = period;
}
int janus_ice_get_event_stats_period(void) {
return janus_ice_event_stats_period;
}
/* How to handle media statistic events (one per media or one per peerConnection) */
static gboolean janus_ice_event_combine_media_stats = false;
void janus_ice_event_set_combine_media_stats(gboolean combine_media_stats_to_one_event) {
janus_ice_event_combine_media_stats = combine_media_stats_to_one_event;
}
gboolean janus_ice_event_get_combine_media_stats(void) {
return janus_ice_event_combine_media_stats;
}
/* RTP/RTCP port range */
static uint16_t rtp_range_min = 0;
static uint16_t rtp_range_max = 0;
#define JANUS_ICE_PACKET_AUDIO 0
#define JANUS_ICE_PACKET_VIDEO 1
#define JANUS_ICE_PACKET_TEXT 2
#define JANUS_ICE_PACKET_BINARY 3
#define JANUS_ICE_PACKET_SCTP 4
/* Janus enqueued (S)RTP/(S)RTCP packet to send */
typedef struct janus_ice_queued_packet {
gint mindex;
char *data;
char *label;
char *protocol;
janus_plugin_rtp_extensions extensions;
gint length;
gint type;
gboolean control;
gboolean retransmission;
gboolean encrypted;
gint64 added;
} janus_ice_queued_packet;
/* A few static, fake, messages we use as a trigger: e.g., to start a
* new DTLS handshake, hangup a PeerConnection or close a handle */
static janus_ice_queued_packet
janus_ice_start_gathering,
janus_ice_add_candidates,
janus_ice_dtls_handshake,
janus_ice_media_stopped,
janus_ice_hangup_peerconnection,
janus_ice_detach_handle,
janus_ice_data_ready;
/* Janus NACKed packet we're tracking (to avoid duplicates) */
typedef struct janus_ice_nacked_packet {
janus_ice_peerconnection_medium *medium;
int vindex;
guint16 seq_number;
guint source_id;
} janus_ice_nacked_packet;
static gboolean janus_ice_nacked_packet_cleanup(gpointer user_data) {
janus_ice_nacked_packet *pkt = (janus_ice_nacked_packet *)user_data;
if(pkt->medium && pkt->medium->pc && pkt->medium->pc->handle) {
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Cleaning up NACKed packet %"SCNu16" (SSRC %"SCNu32", vindex %d)...\n",
pkt->medium->pc->handle->handle_id, pkt->seq_number, pkt->medium->ssrc_peer[pkt->vindex], pkt->vindex);
g_hash_table_remove(pkt->medium->rtx_nacked[pkt->vindex], GUINT_TO_POINTER(pkt->seq_number));
g_hash_table_remove(pkt->medium->pending_nacked_cleanup, GUINT_TO_POINTER(pkt->source_id));
}
return G_SOURCE_REMOVE;
}
/* Deallocation helpers for handles and related structs */
static void janus_ice_handle_free(const janus_refcount *handle_ref);
static void janus_ice_webrtc_free(janus_ice_handle *handle);
static void janus_ice_plugin_session_free(const janus_refcount *app_handle_ref);
static void janus_ice_peerconnection_free(const janus_refcount *pc_ref);
static void janus_ice_peerconnection_medium_free(const janus_refcount *medium_ref);
/* Custom GSource for outgoing traffic */
typedef struct janus_ice_outgoing_traffic {
GSource parent;
janus_ice_handle *handle;
GDestroyNotify destroy;
} janus_ice_outgoing_traffic;
static gboolean janus_ice_outgoing_rtcp_handle(gpointer user_data);
static gboolean janus_ice_outgoing_stats_handle(gpointer user_data);
static gboolean janus_ice_outgoing_traffic_handle(janus_ice_handle *handle, janus_ice_queued_packet *pkt);
static gboolean janus_ice_outgoing_traffic_prepare(GSource *source, gint *timeout) {
janus_ice_outgoing_traffic *t = (janus_ice_outgoing_traffic *)source;
return (g_async_queue_length(t->handle->queued_packets) > 0);
}
static gboolean janus_ice_outgoing_traffic_dispatch(GSource *source, GSourceFunc callback, gpointer user_data) {
janus_ice_outgoing_traffic *t = (janus_ice_outgoing_traffic *)source;
int ret = G_SOURCE_CONTINUE;
janus_ice_queued_packet *pkt = NULL;
while((pkt = g_async_queue_try_pop(t->handle->queued_packets)) != NULL) {
if(janus_ice_outgoing_traffic_handle(t->handle, pkt) == G_SOURCE_REMOVE)
ret = G_SOURCE_REMOVE;
}
return ret;
}
static void janus_ice_outgoing_traffic_finalize(GSource *source) {
janus_ice_outgoing_traffic *t = (janus_ice_outgoing_traffic *)source;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Finalizing loop source\n", t->handle->handle_id);
if(static_event_loops > 0) {
/* This handle was sharing an event loop with others */
janus_ice_webrtc_free(t->handle);
janus_refcount_decrease(&t->handle->ref);
} else if(t->handle->mainloop != NULL && g_main_loop_is_running(t->handle->mainloop)) {
/* This handle had a dedicated event loop, quit it */
g_main_loop_quit(t->handle->mainloop);
}
janus_refcount_decrease(&t->handle->ref);
}
static GSourceFuncs janus_ice_outgoing_traffic_funcs = {
janus_ice_outgoing_traffic_prepare,
NULL, /* We don't need check */
janus_ice_outgoing_traffic_dispatch,
janus_ice_outgoing_traffic_finalize,
NULL, NULL
};
static GSource *janus_ice_outgoing_traffic_create(janus_ice_handle *handle, GDestroyNotify destroy) {
GSource *source = g_source_new(&janus_ice_outgoing_traffic_funcs, sizeof(janus_ice_outgoing_traffic));
janus_ice_outgoing_traffic *t = (janus_ice_outgoing_traffic *)source;
char name[255];
g_snprintf(name, sizeof(name), "source-%"SCNu64, handle->handle_id);
g_source_set_name(source, name);
janus_refcount_increase(&handle->ref);
t->handle = handle;
t->destroy = destroy;
return source;
}
/* Time, in seconds, that should pass with no media (audio or video) being
* received before Janus notifies you about this with a receiving=false */
#define DEFAULT_NO_MEDIA_TIMER 1
static uint no_media_timer = DEFAULT_NO_MEDIA_TIMER;
void janus_set_no_media_timer(uint timer) {
no_media_timer = timer;
if(no_media_timer == 0)
JANUS_LOG(LOG_VERB, "Disabling no-media timer\n");
else
JANUS_LOG(LOG_VERB, "Setting no-media timer to %us\n", no_media_timer);
}
uint janus_get_no_media_timer(void) {
return no_media_timer;
}
/* Number of lost packets per seconds on a media stream (uplink or downlink,
* audio or video), that should result in a slow-link event to the user.
* By default the feature is disabled (threshold=0), as it can be quite
* verbose and is often redundant information, since the same info on lost
* packets (in and out) can already be retrieved via client-side stats */
#define DEFAULT_SLOWLINK_THRESHOLD 0
static uint slowlink_threshold = DEFAULT_SLOWLINK_THRESHOLD;
void janus_set_slowlink_threshold(uint packets) {
slowlink_threshold = packets;
if(slowlink_threshold == 0)
JANUS_LOG(LOG_VERB, "Disabling slow-link events\n");
else
JANUS_LOG(LOG_VERB, "Setting slowlink-threshold to %u packets\n", slowlink_threshold);
}
uint janus_get_slowlink_threshold(void) {
return slowlink_threshold;
}
/* Period, in milliseconds, to refer to for sending TWCC feedback */
#define DEFAULT_TWCC_PERIOD 200
static uint twcc_period = DEFAULT_TWCC_PERIOD;
void janus_set_twcc_period(uint period) {
twcc_period = period;
if(twcc_period == 0) {
JANUS_LOG(LOG_WARN, "Invalid TWCC period, falling back to default\n");
twcc_period = DEFAULT_TWCC_PERIOD;
} else {
JANUS_LOG(LOG_VERB, "Setting TWCC period to %ds\n", twcc_period);
}
}
uint janus_get_twcc_period(void) {
return twcc_period;
}
/* DSCP value, which we can set via libnice: it's disabled by default */
static int dscp_ef = 0;
void janus_set_dscp(int dscp) {
dscp_ef = dscp;
if(dscp_ef > 0) {
JANUS_LOG(LOG_VERB, "Setting DSCP EF to %d\n", dscp_ef);
}
}
int janus_get_dscp(void) {
return dscp_ef;
}
static inline void janus_ice_free_rtp_packet(janus_rtp_packet *pkt) {
if(pkt == NULL) {
return;
}
g_free(pkt->data);
g_free(pkt);
}
static void janus_ice_free_queued_packet(janus_ice_queued_packet *pkt) {
if(pkt == NULL || pkt == &janus_ice_start_gathering ||
pkt == &janus_ice_add_candidates ||
pkt == &janus_ice_dtls_handshake ||
pkt == &janus_ice_media_stopped ||
pkt == &janus_ice_hangup_peerconnection ||
pkt == &janus_ice_detach_handle ||
pkt == &janus_ice_data_ready) {
return;
}
g_free(pkt->data);
g_free(pkt->label);
g_free(pkt->protocol);
g_free(pkt);
}
/* Minimum and maximum value, in milliseconds, for the NACK queue/retransmissions (default=200ms/1000ms) */
#define DEFAULT_MIN_NACK_QUEUE 200
#define DEFAULT_MAX_NACK_QUEUE 1000
/* Maximum ignore count after retransmission (200ms) */
#define MAX_NACK_IGNORE 200000
static gboolean nack_optimizations = FALSE;
void janus_set_nack_optimizations_enabled(gboolean optimize) {
nack_optimizations = optimize;
}
gboolean janus_is_nack_optimizations_enabled(void) {
return nack_optimizations;
}
static uint16_t min_nack_queue = DEFAULT_MIN_NACK_QUEUE;
void janus_set_min_nack_queue(uint16_t mnq) {
min_nack_queue = mnq < DEFAULT_MAX_NACK_QUEUE ? mnq : DEFAULT_MAX_NACK_QUEUE;
if(min_nack_queue == 0)
JANUS_LOG(LOG_VERB, "Disabling NACK queue\n");
else
JANUS_LOG(LOG_VERB, "Setting min NACK queue to %dms\n", min_nack_queue);
}
uint16_t janus_get_min_nack_queue(void) {
return min_nack_queue;
}
/* Helper to clean old NACK packets in the buffer when they exceed the queue time limit */
static void janus_cleanup_nack_buffer(gint64 now, janus_ice_peerconnection *pc, gboolean audio, gboolean video) {
/* Iterate on all media */
janus_ice_peerconnection_medium *medium = NULL;
uint mi=0;
for(mi=0; mi<g_hash_table_size(pc->media); mi++) {
medium = g_hash_table_lookup(pc->media, GUINT_TO_POINTER(mi));
if(!medium)
continue;
if((medium->type == JANUS_MEDIA_AUDIO && !audio) || (medium->type == JANUS_MEDIA_VIDEO && !video))
continue;
if(medium->retransmit_buffer) {
janus_rtp_packet *p = (janus_rtp_packet *)g_queue_peek_head(medium->retransmit_buffer);
while(p && (!now || (now - p->created >= (gint64)medium->nack_queue_ms*1000))) {
/* Packet is too old, get rid of it */
g_queue_pop_head(medium->retransmit_buffer);
/* Remove from hashtable too */
janus_rtp_header *header = (janus_rtp_header *)p->data;
guint16 seq = ntohs(header->seq_number);
g_hash_table_remove(medium->retransmit_seqs, GUINT_TO_POINTER(seq));
/* Free the packet */
janus_ice_free_rtp_packet(p);
p = (janus_rtp_packet *)g_queue_peek_head(medium->retransmit_buffer);
}
}
}
}
#define SEQ_MISSING_WAIT 12000 /* 12ms */
#define SEQ_NACKED_WAIT 155000 /* 155ms */
/* janus_seq_info list functions */
static void janus_seq_append(janus_seq_info **head, janus_seq_info *new_seq) {
if(*head == NULL) {
new_seq->prev = new_seq;
new_seq->next = new_seq;
*head = new_seq;
} else {
janus_seq_info *last_seq = (*head)->prev;
new_seq->prev = last_seq;
new_seq->next = *head;
(*head)->prev = new_seq;
last_seq->next = new_seq;
}
}
static janus_seq_info *janus_seq_pop_head(janus_seq_info **head) {
janus_seq_info *pop_seq = *head;
if(pop_seq) {
janus_seq_info *new_head = pop_seq->next;
if(pop_seq == new_head || new_head == NULL) {
*head = NULL;
} else {
*head = new_head;
new_head->prev = pop_seq->prev;
new_head->prev->next = new_head;
}
}
return pop_seq;
}
void janus_seq_list_free(janus_seq_info **head) {
if(!*head)
return;
janus_seq_info *cur = *head;
do {
janus_seq_info *next = cur->next;
g_free(cur);
cur = next;
} while(cur != *head);
*head = NULL;
}
static int janus_seq_in_range(guint16 seqn, guint16 start, guint16 len) {
/* Supports wrapping sequence (easier with int range) */
int n = seqn;
int nh = (1<<16) + n;
int s = start;
int e = s + len;
return (s <= n && n < e) || (s <= nh && nh < e);
}
/* Internal method for relaying RTCP messages, optionally filtering them in case they come from plugins */
void janus_ice_relay_rtcp_internal(janus_ice_handle *handle, janus_plugin_rtcp *packet, gboolean filter_rtcp);
/* Map of active plugin sessions */
static GHashTable *plugin_sessions;
static janus_mutex plugin_sessions_mutex;
gboolean janus_plugin_session_is_alive(janus_plugin_session *plugin_session) {
if(plugin_session == NULL || plugin_session < (janus_plugin_session *)0x1000 ||
g_atomic_int_get(&plugin_session->stopped))
return FALSE;
/* Make sure this plugin session is still alive */
janus_mutex_lock_nodebug(&plugin_sessions_mutex);
janus_plugin_session *result = g_hash_table_lookup(plugin_sessions, plugin_session);
janus_mutex_unlock_nodebug(&plugin_sessions_mutex);
if(result == NULL) {
JANUS_LOG(LOG_ERR, "Invalid plugin session (%p)\n", plugin_session);
}
return (result != NULL);
}
static void janus_plugin_session_dereference(janus_plugin_session *plugin_session) {
if(plugin_session)
janus_refcount_decrease(&plugin_session->ref);
}
static void janus_ice_clear_queued_candidates(janus_ice_handle *handle) {
if(handle == NULL || handle->queued_candidates == NULL) {
return;
}
while(g_async_queue_length(handle->queued_candidates) > 0) {
(void)g_async_queue_try_pop(handle->queued_candidates);
}
}
static void janus_ice_clear_queued_packets(janus_ice_handle *handle) {
if(handle == NULL || handle->queued_packets == NULL) {
return;
}
janus_ice_queued_packet *pkt = NULL;
while(g_async_queue_length(handle->queued_packets) > 0) {
pkt = g_async_queue_try_pop(handle->queued_packets);
janus_ice_free_queued_packet(pkt);
}
}
static void janus_ice_notify_trickle(janus_ice_handle *handle, char *buffer) {
if(handle == NULL)
return;
char cbuffer[200];
if(buffer != NULL)
g_snprintf(cbuffer, sizeof(cbuffer), "candidate:%s", buffer);
/* Send a "trickle" event to the browser */
janus_session *session = (janus_session *)handle->session;
if(session == NULL)
return;
json_t *event = json_object();
json_object_set_new(event, "janus", json_string("trickle"));
json_object_set_new(event, "session_id", json_integer(session->session_id));
json_object_set_new(event, "sender", json_integer(handle->handle_id));
if(opaqueid_in_api && handle->opaque_id != NULL)
json_object_set_new(event, "opaque_id", json_string(handle->opaque_id));
json_t *candidate = json_object();
if(buffer != NULL) {
json_object_set_new(candidate, "sdpMid", json_string(handle->pc_mid));
json_object_set_new(candidate, "sdpMLineIndex", json_integer(0));
json_object_set_new(candidate, "candidate", json_string(cbuffer));
} else {
json_object_set_new(candidate, "completed", json_true());
}
json_object_set_new(event, "candidate", candidate);
/* Send the event */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Sending trickle event (%s) to transport...\n",
handle->handle_id, buffer ? "candidate" : "end-of-candidates");
janus_session_notify_event(session, event);
}
static void janus_ice_notify_media(janus_ice_handle *handle, char *mid, gboolean video, gboolean simulcast, int substream, gboolean up) {
if(handle == NULL)
return;
/* Prepare JSON event to notify user/application */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Notifying that we %s receiving %s on mid %s\n",
handle->handle_id, up ? "are" : "are NOT", video ? "video" : "audio", mid);
janus_session *session = (janus_session *)handle->session;
if(session == NULL)
return;
json_t *event = json_object();
json_object_set_new(event, "janus", json_string("media"));
json_object_set_new(event, "session_id", json_integer(session->session_id));
json_object_set_new(event, "sender", json_integer(handle->handle_id));
if(opaqueid_in_api && handle->opaque_id != NULL)
json_object_set_new(event, "opaque_id", json_string(handle->opaque_id));
json_object_set_new(event, "mid", json_string(mid));
json_object_set_new(event, "type", json_string(video ? "video" : "audio"));
if(simulcast)
json_object_set_new(event, "substream", json_integer(substream));
json_object_set_new(event, "receiving", up ? json_true() : json_false());
if(!up && no_media_timer > 1)
json_object_set_new(event, "seconds", json_integer(no_media_timer));
/* Send the event */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Sending event to transport...\n", handle->handle_id);
janus_session_notify_event(session, event);
/* Notify event handlers as well */
if(janus_events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "media", json_string(video ? "video" : "audio"));
json_object_set_new(info, "mid", json_string(mid));
if(simulcast)
json_object_set_new(info, "substream", json_integer(substream));
json_object_set_new(info, "receiving", up ? json_true() : json_false());
if(!up && no_media_timer > 1)
json_object_set_new(info, "seconds", json_integer(no_media_timer));
janus_events_notify_handlers(JANUS_EVENT_TYPE_MEDIA, JANUS_EVENT_SUBTYPE_MEDIA_STATE,
session->session_id, handle->handle_id, handle->opaque_id, info);
}
}
void janus_ice_notify_hangup(janus_ice_handle *handle, const char *reason) {
if(handle == NULL)
return;
/* Prepare JSON event to notify user/application */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Notifying WebRTC hangup; %p\n", handle->handle_id, handle);
janus_session *session = (janus_session *)handle->session;
if(session == NULL)
return;
json_t *event = json_object();
json_object_set_new(event, "janus", json_string("hangup"));
json_object_set_new(event, "session_id", json_integer(session->session_id));
json_object_set_new(event, "sender", json_integer(handle->handle_id));
if(opaqueid_in_api && handle->opaque_id != NULL)
json_object_set_new(event, "opaque_id", json_string(handle->opaque_id));
if(reason != NULL)
json_object_set_new(event, "reason", json_string(reason));
/* Send the event */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Sending event to transport...; %p\n", handle->handle_id, handle);
janus_session_notify_event(session, event);
/* Notify event handlers as well */
if(janus_events_is_enabled()) {
json_t *info = json_object();
json_object_set_new(info, "connection", json_string("hangup"));
if(reason != NULL)
json_object_set_new(info, "reason", json_string(reason));
janus_events_notify_handlers(JANUS_EVENT_TYPE_WEBRTC, JANUS_EVENT_SUBTYPE_WEBRTC_STATE,
session->session_id, handle->handle_id, handle->opaque_id, info);
}
}
/* Trickle helpers */
janus_ice_trickle *janus_ice_trickle_new(const char *transaction, json_t *candidate) {
if(transaction == NULL || candidate == NULL)
return NULL;
janus_ice_trickle *trickle = g_malloc(sizeof(janus_ice_trickle));
trickle->handle = NULL;
trickle->received = janus_get_monotonic_time();
trickle->transaction = g_strdup(transaction);
trickle->candidate = json_deep_copy(candidate);
return trickle;
}
gint janus_ice_trickle_parse(janus_ice_handle *handle, json_t *candidate, const char **error) {
const char *ignore_error = NULL;
if(error == NULL) {
error = &ignore_error;
}
if(handle == NULL) {
*error = "Invalid handle";
return JANUS_ERROR_HANDLE_NOT_FOUND;
}
/* Parse trickle candidate */
if(!json_is_object(candidate) || json_object_get(candidate, "completed") != NULL) {
JANUS_LOG(LOG_VERB, "No more remote candidates for handle %"SCNu64"!\n", handle->handle_id);
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_ALL_TRICKLES);
} else {
/* Handle remote candidate */
json_t *mid = json_object_get(candidate, "sdpMid");
if(mid && !json_is_string(mid)) {
*error = "Trickle error: invalid element type (sdpMid should be a string)";
return JANUS_ERROR_INVALID_ELEMENT_TYPE;
}
json_t *mline = json_object_get(candidate, "sdpMLineIndex");
if(mline && (!json_is_integer(mline) || json_integer_value(mline) < 0)) {
*error = "Trickle error: invalid element type (sdpMLineIndex should be a positive integer)";
return JANUS_ERROR_INVALID_ELEMENT_TYPE;
}
if(!mid && !mline) {
*error = "Trickle error: missing mandatory element (sdpMid or sdpMLineIndex)";
return JANUS_ERROR_MISSING_MANDATORY_ELEMENT;
}
json_t *rc = json_object_get(candidate, "candidate");
if(!rc) {
*error = "Trickle error: missing mandatory element (candidate)";
return JANUS_ERROR_MISSING_MANDATORY_ELEMENT;
}
if(!json_is_string(rc)) {
*error = "Trickle error: invalid element type (candidate should be a string)";
return JANUS_ERROR_INVALID_ELEMENT_TYPE;
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Trickle candidate (%s): %s\n", handle->handle_id, json_string_value(mid), json_string_value(rc));
/* Parse it */
int sdpMLineIndex = mline ? json_integer_value(mline) : -1;
const char *sdpMid = json_string_value(mid);
if(sdpMLineIndex > 0 || (handle->pc_mid && sdpMid && strcmp(handle->pc_mid, sdpMid))) {
/* FIXME We bundle everything, so we ignore candidates for anything beyond the first m-line */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Got a mid='%s' candidate (index %d) but we're bundling, ignoring...\n",
handle->handle_id, json_string_value(mid), sdpMLineIndex);
return 0;
}
janus_ice_peerconnection *pc = handle->pc;
if(pc == NULL) {
*error = "Trickle error: invalid element type (no such PeerConnection)";
return JANUS_ERROR_TRICKE_INVALID_STREAM;
}
int res = janus_sdp_parse_candidate(pc, json_string_value(rc), 1);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse candidate... (%d)\n", handle->handle_id, res);
/* FIXME Should we return an error? */
}
}
return 0;
}
void janus_ice_trickle_destroy(janus_ice_trickle *trickle) {
if(trickle == NULL)
return;
g_free(trickle->transaction);
trickle->transaction = NULL;
if(trickle->candidate)
json_decref(trickle->candidate);
trickle->candidate = NULL;
g_free(trickle);
}
/* libnice initialization */
void janus_ice_init(gboolean ice_lite, gboolean ice_tcp, gboolean full_trickle, gboolean ignore_mdns,
gboolean ipv6, gboolean ipv6_linklocal, uint16_t rtp_min_port, uint16_t rtp_max_port) {
janus_ice_lite_enabled = ice_lite;
janus_ice_tcp_enabled = ice_tcp;
janus_full_trickle_enabled = full_trickle;
janus_mdns_enabled = !ignore_mdns;
janus_ipv6_enabled = ipv6;
if(ipv6)
janus_ipv6_linklocal_enabled = ipv6_linklocal;
JANUS_LOG(LOG_INFO, "Initializing ICE stuff (%s mode, ICE-TCP candidates %s, %s-trickle, IPv6 support %s)\n",
janus_ice_lite_enabled ? "Lite" : "Full",
janus_ice_tcp_enabled ? "enabled" : "disabled",
janus_full_trickle_enabled ? "full" : "half",
janus_ipv6_enabled ? "enabled" : "disabled");
if(janus_ice_tcp_enabled) {
#ifndef HAVE_LIBNICE_TCP
JANUS_LOG(LOG_WARN, "libnice version < 0.1.8, disabling ICE-TCP support\n");
janus_ice_tcp_enabled = FALSE;
#else
if(!janus_ice_lite_enabled) {
JANUS_LOG(LOG_WARN, "You may experience problems when having ICE-TCP enabled without having ICE Lite enabled too in libnice\n");
}
#endif
}
/* libnice debugging is disabled unless explicitly stated */
nice_debug_disable(TRUE);
/*! \note The RTP/RTCP port range configuration may be just a placeholder: for
* instance, libnice supports this since 0.1.0, but the 0.1.3 on Fedora fails
* when linking with an undefined reference to \c nice_agent_set_port_range
* so this is checked by the install.sh script in advance. */
rtp_range_min = rtp_min_port;
rtp_range_max = rtp_max_port;
if(rtp_range_max < rtp_range_min) {
JANUS_LOG(LOG_WARN, "Invalid ICE port range: %"SCNu16" > %"SCNu16"\n", rtp_range_min, rtp_range_max);
} else if(rtp_range_min > 0 || rtp_range_max > 0) {
#ifndef HAVE_PORTRANGE
JANUS_LOG(LOG_WARN, "nice_agent_set_port_range unavailable, port range disabled\n");
#else
JANUS_LOG(LOG_INFO, "ICE port range: %"SCNu16"-%"SCNu16"\n", rtp_range_min, rtp_range_max);
#endif
}
if(!janus_mdns_enabled)
JANUS_LOG(LOG_WARN, "mDNS resolution disabled, .local candidates will be ignored\n");
/* We keep track of plugin sessions to avoid problems */
plugin_sessions = g_hash_table_new_full(NULL, NULL, NULL, (GDestroyNotify)janus_plugin_session_dereference);
janus_mutex_init(&plugin_sessions_mutex);
#ifdef HAVE_TURNRESTAPI
/* Initialize the TURN REST API client stack, whether we're going to use it or not */
janus_turnrest_init();
#endif
}
void janus_ice_deinit(void) {