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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 ICE/STUN/TURN processing
* \details Implementation (based on libnice) of the ICE process. 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 gateway callbacks instead.
*
* \ingroup protocols
* \ref protocols
*/
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/socket.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 "dtls.h"
#include "sdp.h"
#include "rtp.h"
#include "rtcp.h"
#include "apierror.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_LIBCURL
return NULL;
#else
return (char *)janus_turnrest_get_backend();
#endif
}
/* 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;
}
/* IPv6 support (still mostly WIP) */
static gboolean janus_ipv6_enabled;
gboolean janus_ice_is_ipv6_enabled(void) {
return janus_ipv6_enabled;
}
/* Whether BUNDLE support is mandatory or not (false by default) */
static gboolean janus_force_bundle;
void janus_ice_force_bundle(gboolean forced) {
janus_force_bundle = forced;
JANUS_LOG(LOG_INFO, "BUNDLE %s going to be forced\n", janus_force_bundle ? "is" : "is NOT");
}
gboolean janus_ice_is_bundle_forced(void) {
return janus_force_bundle;
}
/* Whether rtcp-mux support is mandatory or not (false by default) */
static gboolean janus_force_rtcpmux;
static gint janus_force_rtcpmux_blackhole_port = 1234;
static gint janus_force_rtcpmux_blackhole_fd = -1;
void janus_ice_force_rtcpmux(gboolean forced) {
janus_force_rtcpmux = forced;
JANUS_LOG(LOG_INFO, "rtcp-mux %s going to be forced\n", janus_force_rtcpmux ? "is" : "is NOT");
if(!janus_force_rtcpmux) {
/*
* Since rtcp-mux is NOT going to be forced, we need to do some magic to get rid of unneeded
* RTCP components when rtcp-mux is indeed negotiated when creating a PeerConnection. In
* particular, there's no way to remove a component in libnice (you can only remove streams),
* and you can read why this is a problem here:
* https://github.com/meetecho/janus-gateway/issues/154
* https://github.com/meetecho/janus-gateway/pull/362
* This means that, to effectively do that without just ignoring the component, we need
* to set a dummy candidate on it to "trick" libnice into thinking ICE is done for it.
* Since libnice will still occasionally send keepalives to the dummy peer, and we don't
* want it to send messages to a service that might not like it, we create a "blackhole"
* UDP server to receive all those keepalives and then just discard them.
*/
int blackhole = socket(AF_INET, SOCK_DGRAM, 0);
if(blackhole < 0) {
JANUS_LOG(LOG_WARN, "Error creating RTCP component blackhole socket, using port %d instead\n", janus_force_rtcpmux_blackhole_port);
return;
}
fcntl(blackhole, F_SETFL, O_NONBLOCK);
struct sockaddr_in serveraddr;
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
serveraddr.sin_port = htons(0); /* Choose a random port, that works for us */
if(bind(blackhole, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0) {
JANUS_LOG(LOG_WARN, "Error binding RTCP component blackhole socket, using port %d instead\n", janus_force_rtcpmux_blackhole_port);
close(blackhole);
return;
}
socklen_t len = sizeof(serveraddr);
if(getsockname(blackhole, (struct sockaddr *)&serveraddr, &len) < 0) {
JANUS_LOG(LOG_WARN, "Error retrieving port assigned to RTCP component blackhole socket, using port %d instead\n", janus_force_rtcpmux_blackhole_port);
close(blackhole);
return;
}
janus_force_rtcpmux_blackhole_port = ntohs(serveraddr.sin_port);
JANUS_LOG(LOG_VERB, " -- RTCP component blackhole socket bound to port %d\n", janus_force_rtcpmux_blackhole_port);
janus_force_rtcpmux_blackhole_fd = blackhole;
}
}
gint janus_ice_get_rtcpmux_blackhole_port(void) {
return janus_force_rtcpmux_blackhole_port;
}
gboolean janus_ice_is_rtcpmux_forced(void) {
return janus_force_rtcpmux;
}
/* 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;
void janus_ice_enable_nat_1_1(void) {
nat_1_1_enabled = TRUE;
}
/* 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)) {
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)) {
janus_mutex_unlock(&ice_list_mutex);
return true;
}
temp = temp->next;
}
janus_mutex_unlock(&ice_list_mutex);
return false;
}
/* RTP/RTCP port range */
uint16_t rtp_range_min = 0;
uint16_t rtp_range_max = 0;
/* Helpers to demultiplex protocols */
static gboolean janus_is_dtls(gchar *buf) {
return ((*buf >= 20) && (*buf <= 64));
}
static gboolean janus_is_rtp(gchar *buf) {
rtp_header *header = (rtp_header *)buf;
return ((header->type < 64) || (header->type >= 96));
}
static gboolean janus_is_rtcp(gchar *buf) {
rtp_header *header = (rtp_header *)buf;
return ((header->type >= 64) && (header->type < 96));
}
#define JANUS_ICE_PACKET_AUDIO 0
#define JANUS_ICE_PACKET_VIDEO 1
#define JANUS_ICE_PACKET_DATA 2
/* Janus enqueued (S)RTP/(S)RTCP packet to send */
typedef struct janus_ice_queued_packet {
char *data;
gint length;
gint type;
gboolean control;
gboolean encrypted;
} janus_ice_queued_packet;
/* This is a static, fake, message we use as a trigger to send a DTLS alert */
static janus_ice_queued_packet janus_ice_dtls_alert;
/* Maximum value, in milliseconds, for the NACK queue/retransmissions (default=1000ms=1s) */
#define DEFAULT_MAX_NACK_QUEUE 1000
/* Maximum ignore count after retransmission (100ms) */
#define MAX_NACK_IGNORE 100000
static uint max_nack_queue = DEFAULT_MAX_NACK_QUEUE;
void janus_set_max_nack_queue(uint mnq) {
max_nack_queue = mnq;
if(max_nack_queue == 0)
JANUS_LOG(LOG_VERB, "Disabling NACK queue\n");
else
JANUS_LOG(LOG_VERB, "Setting max NACK queue to %ds\n", max_nack_queue);
}
uint janus_get_max_nack_queue(void) {
return max_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_stream *stream) {
if(stream && stream->rtp_component) {
janus_ice_component *component = stream->rtp_component;
janus_mutex_lock(&component->mutex);
if(component->retransmit_buffer) {
GList *first = g_list_first(component->retransmit_buffer);
janus_rtp_packet *p = (janus_rtp_packet *)first->data;
while(p && (now - p->created >= max_nack_queue*1000)) {
/* Packet is too old, get rid of it */
first->data = NULL;
component->retransmit_buffer = g_list_delete_link(component->retransmit_buffer, first);
g_free(p->data);
p->data = NULL;
g_free(p);
first = g_list_first(component->retransmit_buffer);
p = (janus_rtp_packet *)(first ? first->data : NULL);
}
}
janus_mutex_unlock(&component->mutex);
}
}
#define SEQ_MISSING_WAIT 12000 /* 12ms */
#define SEQ_NACKED_WAIT 155000 /* 155ms */
/* seq_info_t list functions */
static void janus_seq_append(seq_info_t **head, seq_info_t *new_seq) {
if(*head == NULL) {
new_seq->prev = new_seq;
new_seq->next = new_seq;
*head = new_seq;
} else {
seq_info_t *last_seq = (*head)->prev;
new_seq->prev = last_seq;
new_seq->next = *head;
(*head)->prev = new_seq;
last_seq->next = new_seq;
}
}
static seq_info_t *janus_seq_pop_head(seq_info_t **head) {
seq_info_t *pop_seq = *head;
if(pop_seq) {
seq_info_t *new_head = pop_seq->next;
if (pop_seq == new_head) {
*head = NULL;
} else {
*head = new_head;
new_head->prev = pop_seq->prev;
new_head->prev->next = new_head;
}
}
return pop_seq;
}
static void janus_seq_list_free(seq_info_t **head) {
if(!*head) return;
seq_info_t *cur = *head;
do {
seq_info_t *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, int video, char *buf, int len, gboolean filter_rtcp);
/* Map of old plugin sessions that have been closed */
static GHashTable *old_plugin_sessions;
static janus_mutex old_plugin_sessions_mutex;
gboolean janus_plugin_session_is_alive(janus_plugin_session *plugin_session) {
/* Make sure this plugin session is still alive */
janus_mutex_lock(&old_plugin_sessions_mutex);
janus_plugin_session *result = g_hash_table_lookup(old_plugin_sessions, plugin_session);
janus_mutex_unlock(&old_plugin_sessions_mutex);
if(result != NULL) {
JANUS_LOG(LOG_ERR, "Invalid plugin session (%p)\n", plugin_session);
}
return (result == NULL);
}
/* Watchdog for removing old handles */
static GHashTable *old_handles = NULL;
static GMainContext *handles_watchdog_context = NULL;
GMainLoop *handles_watchdog_loop = NULL;
GThread *handles_watchdog = NULL;
static janus_mutex old_handles_mutex;
static gboolean janus_ice_handles_cleanup(gpointer user_data) {
janus_ice_handle *handle = (janus_ice_handle *) user_data;
JANUS_LOG(LOG_INFO, "Cleaning up handle %"SCNu64"...\n", handle->handle_id);
janus_ice_free(handle);
return G_SOURCE_REMOVE;
}
static gboolean janus_ice_handles_check(gpointer user_data) {
GMainContext *watchdog_context = (GMainContext *) user_data;
janus_mutex_lock(&old_handles_mutex);
if(old_handles && g_hash_table_size(old_handles) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, old_handles);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_ice_handle *handle = (janus_ice_handle *) value;
if (!handle) {
continue;
}
/* Schedule the ICE handle for deletion */
g_hash_table_iter_remove(&iter);
GSource *timeout_source = g_timeout_source_new_seconds(3);
g_source_set_callback(timeout_source, janus_ice_handles_cleanup, handle, NULL);
g_source_attach(timeout_source, watchdog_context);
g_source_unref(timeout_source);
}
}
janus_mutex_unlock(&old_handles_mutex);
if(janus_force_rtcpmux_blackhole_fd >= 0) {
/* Also read the blackhole socket (unneeded RTCP components keepalives) and dump the packets */
char buffer[1500];
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
ssize_t res = 0;
do {
/* Read and ignore */
res = recvfrom(janus_force_rtcpmux_blackhole_fd, buffer, sizeof(buffer), 0, (struct sockaddr*)&addr, &len);
} while(res > -1);
}
return G_SOURCE_CONTINUE;
}
static gpointer janus_ice_handles_watchdog(gpointer user_data) {
GMainLoop *loop = (GMainLoop *) user_data;
GMainContext *watchdog_context = g_main_loop_get_context(loop);
GSource *timeout_source;
timeout_source = g_timeout_source_new_seconds(1);
g_source_set_callback(timeout_source, janus_ice_handles_check, watchdog_context, NULL);
g_source_attach(timeout_source, watchdog_context);
g_source_unref(timeout_source);
JANUS_LOG(LOG_INFO, "ICE handles watchdog started\n");
g_main_loop_run(loop);
return NULL;
}
static void janus_ice_notify_media(janus_ice_handle *handle, gboolean video, gboolean up) {
if(handle == NULL)
return;
/* Prepare JSON event to notify user/application */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Notifying that we %s receiving %s\n",
handle->handle_id, up ? "are" : "are NOT", video ? "video" : "audio");
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));
json_object_set_new(event, "type", json_string(video ? "video" : "audio"));
json_object_set_new(event, "receiving", up ? json_true() : json_false());
/* Send the event */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Sending event to transport...\n", handle->handle_id);
janus_session_notify_event(session->session_id, 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, "receiving", up ? json_true() : json_false());
janus_events_notify_handlers(JANUS_EVENT_TYPE_MEDIA, session->session_id, handle->handle_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\n", handle->handle_id);
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(reason != NULL)
json_object_set_new(event, "reason", json_string(reason));
/* Send the event */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Sending event to transport...\n", handle->handle_id);
janus_session_notify_event(session->session_id, 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"));
janus_events_notify_handlers(JANUS_EVENT_TYPE_WEBRTC, session->session_id, handle->handle_id, info);
}
}
/* Trickle helpers */
janus_ice_trickle *janus_ice_trickle_new(janus_ice_handle *handle, const char *transaction, json_t *candidate) {
if(transaction == NULL || candidate == NULL)
return NULL;
janus_ice_trickle *trickle = g_malloc0(sizeof(janus_ice_trickle));
trickle->handle = handle;
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) {
*error = "Trickle error: missing mandatory element (sdpMid)";
return JANUS_ERROR_MISSING_MANDATORY_ELEMENT;
}
if(!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) {
*error = "Trickle error: missing mandatory element (sdpMLineIndex)";
return JANUS_ERROR_MISSING_MANDATORY_ELEMENT;
}
if(!json_is_integer(mline) || json_integer_value(mline) < 0) {
*error = "Trickle error: invalid element type (sdpMLineIndex should be an integer)";
return JANUS_ERROR_INVALID_ELEMENT_TYPE;
}
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 = json_integer_value(mline);
int video = 0, data = 0;
/* FIXME badly, we should have an array of m-lines in the handle object */
switch(sdpMLineIndex) {
case 0:
if(handle->audio_stream == NULL) {
video = handle->video_stream ? 1 : 0;
data = !video;
}
break;
case 1:
if(handle->audio_stream == NULL) {
data = 1;
} else {
video = handle->video_stream ? 1 : 0;
data = !video;
}
break;
case 2:
data = 1;
break;
default:
/* FIXME We don't support more than 3 m-lines right now */
*error = "Trickle error: invalid element type (sdpMLineIndex not [0,2])";
return JANUS_ERROR_INVALID_ELEMENT_TYPE;
}
#ifndef HAVE_SCTP
data = 0;
#endif
if(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_BUNDLE)
&& sdpMLineIndex != 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Got a %s candidate but we're bundling, ignoring...\n", handle->handle_id, json_string_value(mid));
} else {
janus_ice_stream *stream = video ? handle->video_stream : (data ? handle->data_stream : handle->audio_stream);
if(stream == NULL) {
*error = "Trickle error: invalid element type (no such stream)";
return JANUS_ERROR_TRICKE_INVALID_STREAM;
}
int res = janus_sdp_parse_candidate(stream, 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;
trickle->handle = NULL;
if(trickle->transaction)
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 ipv6, uint16_t rtp_min_port, uint16_t rtp_max_port) {
janus_ice_lite_enabled = ice_lite;
janus_ice_tcp_enabled = ice_tcp;
janus_ipv6_enabled = ipv6;
JANUS_LOG(LOG_INFO, "Initializing ICE stuff (%s mode, ICE-TCP candidates %s, IPv6 support %s)\n",
janus_ice_lite_enabled ? "Lite" : "Full",
janus_ice_tcp_enabled ? "enabled" : "disabled",
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, "ICE-TCP only works in libnice if you enable ICE Lite too: disabling ICE-TCP support\n");
janus_ice_tcp_enabled = FALSE;
}
#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
}
/* We keep track of old plugin sessions to avoid problems */
old_plugin_sessions = g_hash_table_new(NULL, NULL);
janus_mutex_init(&old_plugin_sessions_mutex);
/* Start the handles watchdog */
janus_mutex_init(&old_handles_mutex);
old_handles = g_hash_table_new_full(g_int64_hash, g_int64_equal, (GDestroyNotify)g_free, NULL);
handles_watchdog_context = g_main_context_new();
handles_watchdog_loop = g_main_loop_new(handles_watchdog_context, FALSE);
GError *error = NULL;
handles_watchdog = g_thread_try_new("handles watchdog", &janus_ice_handles_watchdog, handles_watchdog_loop, &error);
if(error != NULL) {
JANUS_LOG(LOG_FATAL, "Got error %d (%s) trying to start handles watchdog...\n", error->code, error->message ? error->message : "??");
exit(1);
}
#ifdef HAVE_LIBCURL
/* 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) {
JANUS_LOG(LOG_INFO, "Ending ICE handles watchdog mainloop...\n");
g_main_loop_quit(handles_watchdog_loop);
g_thread_join(handles_watchdog);
handles_watchdog = NULL;
g_main_loop_unref(handles_watchdog_loop);
g_main_context_unref(handles_watchdog_context);
janus_mutex_lock(&old_handles_mutex);
if(old_handles != NULL)
g_hash_table_destroy(old_handles);
if(janus_force_rtcpmux_blackhole_fd >= 0)
close(janus_force_rtcpmux_blackhole_fd);
old_handles = NULL;
janus_mutex_unlock(&old_handles_mutex);
#ifdef HAVE_LIBCURL
janus_turnrest_deinit();
#endif
}
int janus_ice_set_stun_server(gchar *stun_server, uint16_t stun_port) {
if(stun_server == NULL)
return 0; /* No initialization needed */
if(stun_port == 0)
stun_port = 3478;
JANUS_LOG(LOG_INFO, "STUN server to use: %s:%u\n", stun_server, stun_port);
/* Resolve address to get an IP */
struct addrinfo *res = NULL;
if(getaddrinfo(stun_server, NULL, NULL, &res) != 0) {
JANUS_LOG(LOG_ERR, "Could not resolve %s...\n", stun_server);
if(res)
freeaddrinfo(res);
return -1;
}
janus_stun_server = janus_address_to_ip(res->ai_addr);
freeaddrinfo(res);
if(janus_stun_server == NULL) {
JANUS_LOG(LOG_ERR, "Could not resolve %s...\n", stun_server);
return -1;
}
janus_stun_port = stun_port;
JANUS_LOG(LOG_VERB, " >> %s:%u\n", janus_stun_server, janus_stun_port);
/* Test the STUN server */
StunAgent stun;
stun_agent_init (&stun, STUN_ALL_KNOWN_ATTRIBUTES, STUN_COMPATIBILITY_RFC5389, 0);
StunMessage msg;
uint8_t buf[1500];
size_t len = stun_usage_bind_create(&stun, &msg, buf, 1500);
JANUS_LOG(LOG_INFO, "Testing STUN server: message is of %zu bytes\n", len);
int fd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in address, remote;
address.sin_family = AF_INET;
address.sin_port = 0;
address.sin_addr.s_addr = INADDR_ANY;
remote.sin_family = AF_INET;
remote.sin_port = htons(janus_stun_port);
remote.sin_addr.s_addr = inet_addr(janus_stun_server);
if(bind(fd, (struct sockaddr *)(&address), sizeof(struct sockaddr)) < 0) {
JANUS_LOG(LOG_FATAL, "Bind failed for STUN BINDING test\n");
close(fd);
return -1;
}
int bytes = sendto(fd, buf, len, 0, (struct sockaddr*)&remote, sizeof(remote));
if(bytes < 0) {
JANUS_LOG(LOG_FATAL, "Error sending STUN BINDING test\n");
close(fd);
return -1;
}
JANUS_LOG(LOG_VERB, " >> Sent %d bytes %s:%u, waiting for reply...\n", bytes, janus_stun_server, janus_stun_port);
struct timeval timeout;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
timeout.tv_sec = 5; /* FIXME Don't wait forever */
timeout.tv_usec = 0;
select(fd+1, &readfds, NULL, NULL, &timeout);
if(!FD_ISSET(fd, &readfds)) {
JANUS_LOG(LOG_FATAL, "No response to our STUN BINDING test\n");
close(fd);
return -1;
}
socklen_t addrlen = sizeof(remote);
bytes = recvfrom(fd, buf, 1500, 0, (struct sockaddr*)&remote, &addrlen);
JANUS_LOG(LOG_VERB, " >> Got %d bytes...\n", bytes);
if(stun_agent_validate (&stun, &msg, buf, bytes, NULL, NULL) != STUN_VALIDATION_SUCCESS) {
JANUS_LOG(LOG_FATAL, "Failed to validate STUN BINDING response\n");
close(fd);
return -1;
}
StunClass class = stun_message_get_class(&msg);
StunMethod method = stun_message_get_method(&msg);
if(class != STUN_RESPONSE || method != STUN_BINDING) {
JANUS_LOG(LOG_FATAL, "Unexpected STUN response: %d/%d\n", class, method);
close(fd);
return -1;
}
StunMessageReturn ret = stun_message_find_xor_addr(&msg, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS, (struct sockaddr_storage *)&address, &addrlen);
JANUS_LOG(LOG_VERB, " >> XOR-MAPPED-ADDRESS: %d\n", ret);
if(ret == STUN_MESSAGE_RETURN_SUCCESS) {
char *public_ip = janus_address_to_ip((struct sockaddr *)&address);
JANUS_LOG(LOG_INFO, " >> Our public address is %s\n", public_ip);
janus_set_public_ip(public_ip);
g_free(public_ip);
close(fd);
return 0;
}
ret = stun_message_find_addr(&msg, STUN_ATTRIBUTE_MAPPED_ADDRESS, (struct sockaddr_storage *)&address, &addrlen);
JANUS_LOG(LOG_VERB, " >> MAPPED-ADDRESS: %d\n", ret);
if(ret == STUN_MESSAGE_RETURN_SUCCESS) {
char *public_ip = janus_address_to_ip((struct sockaddr *)&address);
JANUS_LOG(LOG_INFO, " >> Our public address is %s\n", public_ip);
janus_set_public_ip(public_ip);
g_free(public_ip);
close(fd);
return 0;
}
close(fd);
return -1;
}
int janus_ice_set_turn_server(gchar *turn_server, uint16_t turn_port, gchar *turn_type, gchar *turn_user, gchar *turn_pwd) {
if(turn_server == NULL)
return 0; /* No initialization needed */
if(turn_type == NULL)
turn_type = (char *)"udp";
if(turn_port == 0)
turn_port = 3478;
JANUS_LOG(LOG_INFO, "TURN server to use: %s:%u (%s)\n", turn_server, turn_port, turn_type);
if(!strcasecmp(turn_type, "udp")) {
janus_turn_type = NICE_RELAY_TYPE_TURN_UDP;
} else if(!strcasecmp(turn_type, "tcp")) {
janus_turn_type = NICE_RELAY_TYPE_TURN_TCP;
} else if(!strcasecmp(turn_type, "tls")) {
janus_turn_type = NICE_RELAY_TYPE_TURN_TLS;
} else {
JANUS_LOG(LOG_ERR, "Unsupported relay type '%s'...\n", turn_type);
return -1;
}
/* Resolve address to get an IP */
struct addrinfo *res = NULL;
if(getaddrinfo(turn_server, NULL, NULL, &res) != 0) {
JANUS_LOG(LOG_ERR, "Could not resolve %s...\n", turn_server);
if(res)
freeaddrinfo(res);
return -1;
}
if(janus_turn_server != NULL)
g_free(janus_turn_server);
janus_turn_server = janus_address_to_ip(res->ai_addr);
freeaddrinfo(res);
if(janus_turn_server == NULL) {
JANUS_LOG(LOG_ERR, "Could not resolve %s...\n", turn_server);
return -1;
}
janus_turn_port = turn_port;
JANUS_LOG(LOG_VERB, " >> %s:%u\n", janus_turn_server, janus_turn_port);
if(janus_turn_user != NULL)
g_free(janus_turn_user);
janus_turn_user = NULL;
if(turn_user)
janus_turn_user = g_strdup(turn_user);
if(janus_turn_pwd != NULL)
g_free(janus_turn_pwd);
janus_turn_pwd = NULL;
if(turn_pwd)
janus_turn_pwd = g_strdup(turn_pwd);
return 0;
}
int janus_ice_set_turn_rest_api(gchar *api_server, gchar *api_key, gchar *api_method) {
#ifndef HAVE_LIBCURL
JANUS_LOG(LOG_ERR, "Janus has been nuilt with no libcurl support, TURN REST API unavailable\n");
return -1;
#else
if(api_server != NULL &&
(strstr(api_server, "http://") != api_server && strstr(api_server, "https://") != api_server)) {
JANUS_LOG(LOG_ERR, "Invalid TURN REST API backend: not an HTTP address\n");
return -1;
}
janus_turnrest_set_backend(api_server, api_key, api_method);
JANUS_LOG(LOG_INFO, "TURN REST API backend: %s\n", api_server ? api_server : "(disabled)");
#endif
return 0;
}
/* ICE stuff */
static const gchar *janus_ice_state_name[] =
{
"disconnected",
"gathering",
"connecting",
"connected",
"ready",
"failed"
};
const gchar *janus_get_ice_state_name(gint state) {
if(state < 0 || state > 5)
return NULL;
return janus_ice_state_name[state];
}
/* Stats */
static void janus_ice_stats_queue_free(gpointer data) {
janus_ice_stats_item *s = (janus_ice_stats_item *)data;
g_free(s);
}
void janus_ice_stats_reset(janus_ice_stats *stats) {
if(stats == NULL)
return;
stats->audio_packets = 0;
stats->audio_bytes = 0;
if(stats->audio_bytes_lastsec)
g_list_free_full(stats->audio_bytes_lastsec, &janus_ice_stats_queue_free);
stats->audio_bytes_lastsec = NULL;
stats->audio_notified_lastsec = FALSE;
stats->audio_nacks = 0;
stats->video_packets = 0;
stats->video_bytes = 0;
if(stats->video_bytes_lastsec)
g_list_free_full(stats->video_bytes_lastsec, &janus_ice_stats_queue_free);
stats->video_bytes_lastsec = NULL;
stats->video_notified_lastsec = FALSE;
stats->video_nacks = 0;
stats->data_packets = 0;
stats->data_bytes = 0;
stats->last_slowlink_time = 0;
stats->sl_nack_period_ts = 0;
stats->sl_nack_recent_cnt = 0;
}
/* ICE Handles */
janus_ice_handle *janus_ice_handle_create(void *gateway_session, const char *opaque_id) {
if(gateway_session == NULL)
return NULL;
janus_session *session = (janus_session *)gateway_session;
guint64 handle_id = 0;
while(handle_id == 0) {
handle_id = janus_random_uint64();
if(janus_ice_handle_find(gateway_session, handle_id) != NULL) {
/* Handle ID already taken, try another one */
handle_id = 0;
}
}
JANUS_LOG(LOG_INFO, "Creating new handle in session %"SCNu64": %"SCNu64"\n", session->session_id, handle_id);
janus_ice_handle *handle = (janus_ice_handle *)g_malloc0(sizeof(janus_ice_handle));
if(handle == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
handle->session = gateway_session;
if(opaque_id)
handle->opaque_id = g_strdup(opaque_id);
handle->created = janus_get_monotonic_time();
handle->handle_id = handle_id;
handle->app = NULL;
handle->app_handle = NULL;
janus_mutex_init(&handle->mutex);
/* Set up other stuff. */
janus_mutex_lock(&session->mutex);
if(session->ice_handles == NULL)
session->ice_handles = g_hash_table_new_full(g_int64_hash, g_int64_equal, (GDestroyNotify)g_free, NULL);
g_hash_table_insert(session->ice_handles, janus_uint64_dup(handle->handle_id), handle);
janus_mutex_unlock(&session->mutex);
return handle;
}
janus_ice_handle *janus_ice_handle_find(void *gateway_session, guint64 handle_id) {
if(gateway_session == NULL)
return NULL;
janus_session *session = (janus_session *)gateway_session;
janus_mutex_lock(&session->mutex);
janus_ice_handle *handle = session->ice_handles ? g_hash_table_lookup(session->ice_handles, &handle_id) : NULL;
janus_mutex_unlock(&session->mutex);
return handle;
}
gint janus_ice_handle_attach_plugin(void *gateway_session, guint64 handle_id, janus_plugin *plugin) {
if(gateway_session == NULL)
return JANUS_ERROR_SESSION_NOT_FOUND;
if(plugin == NULL)
return JANUS_ERROR_PLUGIN_NOT_FOUND;
janus_session *session = (janus_session *)gateway_session;
janus_ice_handle *handle = janus_ice_handle_find(session, handle_id);
if(handle == NULL)
return JANUS_ERROR_HANDLE_NOT_FOUND;
janus_mutex_lock(&session->mutex);
if(handle->app != NULL) {
/* This handle is already attached to a plugin */
janus_mutex_unlock(&session->mutex);
return JANUS_ERROR_PLUGIN_ATTACH;
}
int error = 0;
janus_plugin_session *session_handle = g_malloc0(sizeof(janus_plugin_session));
if(session_handle == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
janus_mutex_unlock(&session->mutex);
return JANUS_ERROR_UNKNOWN; /* FIXME Do we need something like "Internal Server Error"? */
}
session_handle->gateway_handle = handle;
session_handle->plugin_handle = NULL;
session_handle->stopped = 0;
plugin->create_session(session_handle, &error);
if(error) {