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janus.c
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janus.c
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/*! \file janus.c
* \author Lorenzo Miniero <[email protected]>
* \copyright GNU General Public License v3
* \brief Janus core
* \details Implementation of the Janus core. This code takes care of
* the server initialization (command line/configuration) and setup,
* and makes use of the available transport plugins (by default HTTP,
* WebSockets, RabbitMQ, if compiled) and Janus protocol (a JSON-based
* protocol) to interact with the applications, whether they're web based
* or not. The core also takes care of bridging peers and plugins
* accordingly, in terms of both messaging and real-time media transfer
* via WebRTC.
*
* \ingroup core
* \ref core
*/
#include <dlfcn.h>
#include <dirent.h>
#include <net/if.h>
#include <netdb.h>
#include <signal.h>
#include <getopt.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <poll.h>
#include "janus.h"
#include "version.h"
#include "cmdline.h"
#include "config.h"
#include "apierror.h"
#include "debug.h"
#include "ip-utils.h"
#include "rtcp.h"
#include "auth.h"
#include "record.h"
#include "events.h"
#define JANUS_NAME "Janus WebRTC Server"
#define JANUS_AUTHOR "Meetecho s.r.l."
#define JANUS_SERVER_NAME "MyJanusInstance"
#ifdef __MACH__
#define SHLIB_EXT "0.dylib"
#else
#define SHLIB_EXT ".so"
#endif
static janus_config *config = NULL;
static char *config_file = NULL;
static char *configs_folder = NULL;
static GHashTable *transports = NULL;
static GHashTable *transports_so = NULL;
static GHashTable *eventhandlers = NULL;
static GHashTable *eventhandlers_so = NULL;
static GHashTable *plugins = NULL;
static GHashTable *plugins_so = NULL;
/* Daemonization */
static gboolean daemonize = FALSE;
static int pipefd[2];
#ifdef REFCOUNT_DEBUG
/* Reference counters debugging */
GHashTable *counters = NULL;
janus_mutex counters_mutex;
#endif
/* API secrets */
static char *api_secret = NULL, *admin_api_secret = NULL;
/* JSON parameters */
static int janus_process_error_string(janus_request *request, uint64_t session_id, const char *transaction, gint error, gchar *error_string);
static struct janus_json_parameter incoming_request_parameters[] = {
{"transaction", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"janus", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"id", JSON_INTEGER, JANUS_JSON_PARAM_POSITIVE}
};
static struct janus_json_parameter attach_parameters[] = {
{"plugin", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"opaque_id", JSON_STRING, 0},
};
static struct janus_json_parameter body_parameters[] = {
{"body", JSON_OBJECT, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter jsep_parameters[] = {
{"type", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"trickle", JANUS_JSON_BOOL, 0},
{"sdp", JSON_STRING, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter add_token_parameters[] = {
{"token", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"plugins", JSON_ARRAY, 0}
};
static struct janus_json_parameter token_parameters[] = {
{"token", JSON_STRING, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter admin_parameters[] = {
{"transaction", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"janus", JSON_STRING, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter debug_parameters[] = {
{"debug", JANUS_JSON_BOOL, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter timeout_parameters[] = {
{"timeout", JSON_INTEGER, JANUS_JSON_PARAM_REQUIRED | JANUS_JSON_PARAM_POSITIVE}
};
static struct janus_json_parameter level_parameters[] = {
{"level", JSON_INTEGER, JANUS_JSON_PARAM_REQUIRED | JANUS_JSON_PARAM_POSITIVE}
};
static struct janus_json_parameter timestamps_parameters[] = {
{"timestamps", JANUS_JSON_BOOL, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter colors_parameters[] = {
{"colors", JANUS_JSON_BOOL, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter mnq_parameters[] = {
{"max_nack_queue", JSON_INTEGER, JANUS_JSON_PARAM_REQUIRED | JANUS_JSON_PARAM_POSITIVE}
};
static struct janus_json_parameter nmt_parameters[] = {
{"no_media_timer", JSON_INTEGER, JANUS_JSON_PARAM_REQUIRED | JANUS_JSON_PARAM_POSITIVE}
};
static struct janus_json_parameter ans_parameters[] = {
{"accept", JANUS_JSON_BOOL, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter queryhandler_parameters[] = {
{"handler", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"request", JSON_OBJECT, 0}
};
static struct janus_json_parameter customevent_parameters[] = {
{"schema", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"data", JSON_OBJECT, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter text2pcap_parameters[] = {
{"folder", JSON_STRING, 0},
{"filename", JSON_STRING, 0},
{"truncate", JSON_INTEGER, JANUS_JSON_PARAM_POSITIVE}
};
/* Admin/Monitor helpers */
json_t *janus_admin_stream_summary(janus_ice_stream *stream);
json_t *janus_admin_component_summary(janus_ice_component *component);
/* IP addresses */
static gchar *local_ip = NULL;
gchar *janus_get_local_ip(void) {
return local_ip;
}
static gchar *public_ip = NULL;
gchar *janus_get_public_ip(void) {
/* Fallback to the local IP, if we have no public one */
return public_ip ? public_ip : local_ip;
}
void janus_set_public_ip(const char *ip) {
/* once set do not override */
if(ip == NULL || public_ip != NULL)
return;
public_ip = g_strdup(ip);
}
static volatile gint stop = 0;
static gint stop_signal = 0;
gint janus_is_stopping(void) {
return g_atomic_int_get(&stop);
}
/* Public instance name */
static gchar *server_name = NULL;
static json_t *janus_create_message(const char *status, uint64_t session_id, const char *transaction) {
json_t *msg = json_object();
json_object_set_new(msg, "janus", json_string(status));
if(session_id > 0)
json_object_set_new(msg, "session_id", json_integer(session_id));
if(transaction != NULL)
json_object_set_new(msg, "transaction", json_string(transaction));
return msg;
}
/* The default timeout for sessions is 60 seconds: this means that, if
* we don't get any activity (i.e., no request) on this session for more
* than 60 seconds, then it's considered expired and we destroy it. That's
* why we have a keep-alive method in the API. This can be overridden in
* either janus.cfg/.jcfg or from the command line. Setting this to 0 will
* disable the timeout mechanism, which is NOT suggested as it may risk
* having orphaned sessions (sessions not controlled by any transport
* and never freed). Besides, notice that if you make this shorter than
* 30s, you'll have to update the timers in janus.js when the long
* polling mechanism is used and shorten them as well, or you'll risk
* incurring in unexpected timeouts (when HTTP is used in janus.js, the
* long poll is used as a keepalive mechanism). */
#define DEFAULT_SESSION_TIMEOUT 60
static uint session_timeout = DEFAULT_SESSION_TIMEOUT;
#define DEFAULT_RECLAIM_SESSION_TIMEOUT 0
static uint reclaim_session_timeout = DEFAULT_RECLAIM_SESSION_TIMEOUT;
/* We can programmatically change whether we want to accept new sessions
* or not: the default is of course TRUE, but we may want to temporarily
* change that in some cases, e.g., if we don't want the load on this
* server to grow too much, or because we're draining the server. */
static gboolean accept_new_sessions = TRUE;
/* We don't hold (trickle) candidates indefinitely either: by default, we
* only store them for 45 seconds. After that, they're discarded, in order
* to avoid leaks or orphaned media details. This means that, if for instance
* you're trying to set up a call with someone, and that someone only answers
* a minute later, the candidates you sent initially will be discarded and
* the call will fail. You can modify the default value in janus.cfg */
#define DEFAULT_CANDIDATES_TIMEOUT 45
static uint candidates_timeout = DEFAULT_CANDIDATES_TIMEOUT;
/* Information */
static json_t *janus_info(const char *transaction) {
/* Prepare a summary on the Janus instance */
json_t *info = janus_create_message("server_info", 0, transaction);
json_object_set_new(info, "name", json_string(JANUS_NAME));
json_object_set_new(info, "version", json_integer(janus_version));
json_object_set_new(info, "version_string", json_string(janus_version_string));
json_object_set_new(info, "author", json_string(JANUS_AUTHOR));
json_object_set_new(info, "commit-hash", json_string(janus_build_git_sha));
json_object_set_new(info, "compile-time", json_string(janus_build_git_time));
json_object_set_new(info, "log-to-stdout", janus_log_is_stdout_enabled() ? json_true() : json_false());
json_object_set_new(info, "log-to-file", janus_log_is_logfile_enabled() ? json_true() : json_false());
if(janus_log_is_logfile_enabled())
json_object_set_new(info, "log-path", json_string(janus_log_get_logfile_path()));
#ifdef HAVE_SCTP
json_object_set_new(info, "data_channels", json_true());
#else
json_object_set_new(info, "data_channels", json_false());
#endif
json_object_set_new(info, "accepting-new-sessions", accept_new_sessions ? json_true() : json_false());
json_object_set_new(info, "session-timeout", json_integer(session_timeout));
json_object_set_new(info, "reclaim-session-timeout", json_integer(reclaim_session_timeout));
json_object_set_new(info, "candidates-timeout", json_integer(candidates_timeout));
json_object_set_new(info, "server-name", json_string(server_name ? server_name : JANUS_SERVER_NAME));
json_object_set_new(info, "local-ip", json_string(local_ip));
if(public_ip != NULL)
json_object_set_new(info, "public-ip", json_string(public_ip));
json_object_set_new(info, "ipv6", janus_ice_is_ipv6_enabled() ? json_true() : json_false());
json_object_set_new(info, "ice-lite", janus_ice_is_ice_lite_enabled() ? json_true() : json_false());
json_object_set_new(info, "ice-tcp", janus_ice_is_ice_tcp_enabled() ? json_true() : json_false());
json_object_set_new(info, "full-trickle", janus_ice_is_full_trickle_enabled() ? json_true() : json_false());
json_object_set_new(info, "rfc-4588", janus_is_rfc4588_enabled() ? json_true() : json_false());
json_object_set_new(info, "twcc-period", json_integer(janus_get_twcc_period()));
if(janus_ice_get_stun_server() != NULL) {
char server[255];
g_snprintf(server, 255, "%s:%"SCNu16, janus_ice_get_stun_server(), janus_ice_get_stun_port());
json_object_set_new(info, "stun-server", json_string(server));
}
if(janus_ice_get_turn_server() != NULL) {
char server[255];
g_snprintf(server, 255, "%s:%"SCNu16, janus_ice_get_turn_server(), janus_ice_get_turn_port());
json_object_set_new(info, "turn-server", json_string(server));
}
json_object_set_new(info, "static-event-loops", json_integer(janus_ice_get_static_event_loops()));
json_object_set_new(info, "api_secret", api_secret ? json_true() : json_false());
json_object_set_new(info, "auth_token", janus_auth_is_enabled() ? json_true() : json_false());
json_object_set_new(info, "event_handlers", janus_events_is_enabled() ? json_true() : json_false());
json_object_set_new(info, "opaqueid_in_api", janus_is_opaqueid_in_api_enabled() ? json_true() : json_false());
/* Available transports */
json_t *t_data = json_object();
if(transports && g_hash_table_size(transports) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, transports);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_transport *t = value;
if(t == NULL) {
continue;
}
json_t *transport = json_object();
json_object_set_new(transport, "name", json_string(t->get_name()));
json_object_set_new(transport, "author", json_string(t->get_author()));
json_object_set_new(transport, "description", json_string(t->get_description()));
json_object_set_new(transport, "version_string", json_string(t->get_version_string()));
json_object_set_new(transport, "version", json_integer(t->get_version()));
json_object_set_new(t_data, t->get_package(), transport);
}
}
json_object_set_new(info, "transports", t_data);
/* Available event handlers */
json_t *e_data = json_object();
if(eventhandlers && g_hash_table_size(eventhandlers) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, eventhandlers);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_eventhandler *e = value;
if(e == NULL) {
continue;
}
json_t *eventhandler = json_object();
json_object_set_new(eventhandler, "name", json_string(e->get_name()));
json_object_set_new(eventhandler, "author", json_string(e->get_author()));
json_object_set_new(eventhandler, "description", json_string(e->get_description()));
json_object_set_new(eventhandler, "version_string", json_string(e->get_version_string()));
json_object_set_new(eventhandler, "version", json_integer(e->get_version()));
json_object_set_new(e_data, e->get_package(), eventhandler);
}
}
json_object_set_new(info, "events", e_data);
/* Available plugins */
json_t *p_data = json_object();
if(plugins && g_hash_table_size(plugins) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, plugins);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_plugin *p = value;
if(p == NULL) {
continue;
}
json_t *plugin = json_object();
json_object_set_new(plugin, "name", json_string(p->get_name()));
json_object_set_new(plugin, "author", json_string(p->get_author()));
json_object_set_new(plugin, "description", json_string(p->get_description()));
json_object_set_new(plugin, "version_string", json_string(p->get_version_string()));
json_object_set_new(plugin, "version", json_integer(p->get_version()));
json_object_set_new(p_data, p->get_package(), plugin);
}
}
json_object_set_new(info, "plugins", p_data);
return info;
}
/* Logging */
int janus_log_level = LOG_INFO;
gboolean janus_log_timestamps = FALSE;
gboolean janus_log_colors = FALSE;
int lock_debug = 0;
#ifdef REFCOUNT_DEBUG
int refcount_debug = 1;
#else
int refcount_debug = 0;
#endif
/*! \brief Signal handler (just used to intercept CTRL+C and SIGTERM) */
static void janus_handle_signal(int signum) {
stop_signal = signum;
switch(g_atomic_int_get(&stop)) {
case 0:
JANUS_PRINT("Stopping server, please wait...\n");
break;
case 1:
JANUS_PRINT("In a hurry? I'm trying to free resources cleanly, here!\n");
break;
default:
JANUS_PRINT("Ok, leaving immediately...\n");
break;
}
g_atomic_int_inc(&stop);
if(g_atomic_int_get(&stop) > 2)
exit(1);
}
/*! \brief Termination handler (atexit) */
static void janus_termination_handler(void) {
/* Free the instance name, if provided */
g_free(server_name);
/* Remove the PID file if we created it */
janus_pidfile_remove();
/* Close the logger */
janus_log_destroy();
/* If we're daemonizing, we send an error code to the parent */
if(daemonize) {
int code = 1;
ssize_t res = 0;
do {
res = write(pipefd[1], &code, sizeof(int));
} while(res == -1 && errno == EINTR);
}
}
/** @name Transport plugin callback interface
* These are the callbacks implemented by the Janus core, as part of
* the janus_transport_callbacks interface. Everything the transport
* plugins send the core is handled here.
*/
///@{
void janus_transport_incoming_request(janus_transport *plugin, janus_transport_session *transport, void *request_id, gboolean admin, json_t *message, json_error_t *error);
void janus_transport_gone(janus_transport *plugin, janus_transport_session *transport);
gboolean janus_transport_is_api_secret_needed(janus_transport *plugin);
gboolean janus_transport_is_api_secret_valid(janus_transport *plugin, const char *apisecret);
gboolean janus_transport_is_auth_token_needed(janus_transport *plugin);
gboolean janus_transport_is_auth_token_valid(janus_transport *plugin, const char *token);
void janus_transport_notify_event(janus_transport *plugin, void *transport, json_t *event);
static janus_transport_callbacks janus_handler_transport =
{
.incoming_request = janus_transport_incoming_request,
.transport_gone = janus_transport_gone,
.is_api_secret_needed = janus_transport_is_api_secret_needed,
.is_api_secret_valid = janus_transport_is_api_secret_valid,
.is_auth_token_needed = janus_transport_is_auth_token_needed,
.is_auth_token_valid = janus_transport_is_auth_token_valid,
.events_is_enabled = janus_events_is_enabled,
.notify_event = janus_transport_notify_event,
};
static GAsyncQueue *requests = NULL;
static janus_request exit_message;
static GThreadPool *tasks = NULL;
void janus_transport_task(gpointer data, gpointer user_data);
///@}
/** @name Plugin callback interface
* These are the callbacks implemented by the Janus core, as part of
* the janus_callbacks interface. Everything the plugins send the
* core is handled here.
*/
///@{
int janus_plugin_push_event(janus_plugin_session *plugin_session, janus_plugin *plugin, const char *transaction, json_t *message, json_t *jsep);
json_t *janus_plugin_handle_sdp(janus_plugin_session *plugin_session, janus_plugin *plugin, const char *sdp_type, const char *sdp, gboolean restart);
void janus_plugin_relay_rtp(janus_plugin_session *plugin_session, int video, char *buf, int len);
void janus_plugin_relay_rtcp(janus_plugin_session *plugin_session, int video, char *buf, int len);
void janus_plugin_relay_data(janus_plugin_session *plugin_session, char *label, char *buf, int len);
void janus_plugin_close_pc(janus_plugin_session *plugin_session);
void janus_plugin_end_session(janus_plugin_session *plugin_session);
void janus_plugin_notify_event(janus_plugin *plugin, janus_plugin_session *plugin_session, json_t *event);
gboolean janus_plugin_auth_is_signature_valid(janus_plugin *plugin, const char *token);
gboolean janus_plugin_auth_signature_contains(janus_plugin *plugin, const char *token, const char *desc);
static janus_callbacks janus_handler_plugin =
{
.push_event = janus_plugin_push_event,
.relay_rtp = janus_plugin_relay_rtp,
.relay_rtcp = janus_plugin_relay_rtcp,
.relay_data = janus_plugin_relay_data,
.close_pc = janus_plugin_close_pc,
.end_session = janus_plugin_end_session,
.events_is_enabled = janus_events_is_enabled,
.notify_event = janus_plugin_notify_event,
.auth_is_signature_valid = janus_plugin_auth_is_signature_valid,
.auth_signature_contains = janus_plugin_auth_signature_contains,
};
///@}
/* Core Sessions */
static janus_mutex sessions_mutex;
static GHashTable *sessions = NULL;
static GMainContext *sessions_watchdog_context = NULL;
static void janus_ice_handle_dereference(janus_ice_handle *handle) {
if(handle)
janus_refcount_decrease(&handle->ref);
}
static void janus_session_free(const janus_refcount *session_ref) {
janus_session *session = janus_refcount_containerof(session_ref, janus_session, ref);
/* This session can be destroyed, free all the resources */
if(session->ice_handles != NULL) {
g_hash_table_destroy(session->ice_handles);
session->ice_handles = NULL;
}
if(session->source != NULL) {
janus_request_destroy(session->source);
session->source = NULL;
}
g_free(session);
}
static gboolean janus_check_sessions(gpointer user_data) {
if(session_timeout < 1) /* Session timeouts are disabled */
return G_SOURCE_CONTINUE;
janus_mutex_lock(&sessions_mutex);
if(sessions && g_hash_table_size(sessions) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, sessions);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_session *session = (janus_session *) value;
if (!session || g_atomic_int_get(&session->destroyed)) {
continue;
}
gint64 now = janus_get_monotonic_time();
if ((now - session->last_activity >= (gint64)session_timeout * G_USEC_PER_SEC &&
!g_atomic_int_compare_and_exchange(&session->timeout, 0, 1)) ||
((g_atomic_int_get(&session->transport_gone) && now - session->last_activity >= (gint64)reclaim_session_timeout * G_USEC_PER_SEC) &&
!g_atomic_int_compare_and_exchange(&session->timeout, 0, 1))) {
JANUS_LOG(LOG_INFO, "Timeout expired for session %"SCNu64"...\n", session->session_id);
/* Mark the session as over, we'll deal with it later */
janus_session_handles_clear(session);
/* Notify the transport */
if(session->source) {
json_t *event = janus_create_message("timeout", session->session_id, NULL);
/* Send this to the transport client and notify the session's over */
session->source->transport->send_message(session->source->instance, NULL, FALSE, event);
session->source->transport->session_over(session->source->instance, session->session_id, TRUE, FALSE);
}
/* Notify event handlers as well */
if(janus_events_is_enabled())
janus_events_notify_handlers(JANUS_EVENT_TYPE_SESSION, session->session_id, "timeout", NULL);
/* FIXME Is this safe? apparently it causes hash table errors on the console */
g_hash_table_iter_remove(&iter);
janus_session_destroy(session);
}
}
}
janus_mutex_unlock(&sessions_mutex);
return G_SOURCE_CONTINUE;
}
static gpointer janus_sessions_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(2);
g_source_set_callback(timeout_source, janus_check_sessions, watchdog_context, NULL);
g_source_attach(timeout_source, watchdog_context);
g_source_unref(timeout_source);
JANUS_LOG(LOG_INFO, "Sessions watchdog started\n");
g_main_loop_run(loop);
JANUS_LOG(LOG_INFO, "Sessions watchdog stopped\n");
return NULL;
}
janus_session *janus_session_create(guint64 session_id) {
janus_session *session = NULL;
if(session_id == 0) {
while(session_id == 0) {
session_id = janus_random_uint64();
session = janus_session_find(session_id);
if(session != NULL) {
/* Session ID already taken, try another one */
janus_refcount_decrease(&session->ref);
session_id = 0;
}
}
}
session = (janus_session *)g_malloc(sizeof(janus_session));
JANUS_LOG(LOG_INFO, "Creating new session: %"SCNu64"; %p\n", session_id, session);
session->session_id = session_id;
janus_refcount_init(&session->ref, janus_session_free);
session->source = NULL;
g_atomic_int_set(&session->destroyed, 0);
g_atomic_int_set(&session->timeout, 0);
g_atomic_int_set(&session->transport_gone, 0);
session->last_activity = janus_get_monotonic_time();
session->ice_handles = NULL;
janus_mutex_init(&session->mutex);
janus_mutex_lock(&sessions_mutex);
g_hash_table_insert(sessions, janus_uint64_dup(session->session_id), session);
janus_mutex_unlock(&sessions_mutex);
return session;
}
janus_session *janus_session_find(guint64 session_id) {
janus_mutex_lock(&sessions_mutex);
janus_session *session = g_hash_table_lookup(sessions, &session_id);
if(session != NULL) {
/* A successful find automatically increases the reference counter:
* it's up to the caller to decrease it again when done */
janus_refcount_increase(&session->ref);
}
janus_mutex_unlock(&sessions_mutex);
return session;
}
void janus_session_notify_event(janus_session *session, json_t *event) {
if(session != NULL && !g_atomic_int_get(&session->destroyed) && session->source != NULL && session->source->transport != NULL) {
/* Send this to the transport client */
JANUS_LOG(LOG_HUGE, "Sending event to %s (%p)\n", session->source->transport->get_package(), session->source->instance);
session->source->transport->send_message(session->source->instance, NULL, FALSE, event);
} else {
/* No transport, free the event */
json_decref(event);
}
}
/* Destroys a session but does not remove it from the sessions hash table. */
gint janus_session_destroy(janus_session *session) {
guint64 session_id = session->session_id;
JANUS_LOG(LOG_INFO, "Destroying session %"SCNu64"; %p\n", session_id, session);
if(!g_atomic_int_compare_and_exchange(&session->destroyed, 0, 1))
return 0;
janus_session_handles_clear(session);
/* The session will actually be destroyed when the counter gets to 0 */
janus_refcount_decrease(&session->ref);
return 0;
}
janus_ice_handle *janus_session_handles_find(janus_session *session, guint64 handle_id) {
if(session == NULL)
return NULL;
janus_mutex_lock(&session->mutex);
janus_ice_handle *handle = session->ice_handles ? g_hash_table_lookup(session->ice_handles, &handle_id) : NULL;
if(handle != NULL) {
/* A successful find automatically increases the reference counter:
* it's up to the caller to decrease it again when done */
janus_refcount_increase(&handle->ref);
}
janus_mutex_unlock(&session->mutex);
return handle;
}
void janus_session_handles_insert(janus_session *session, janus_ice_handle *handle) {
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, (GDestroyNotify)janus_ice_handle_dereference);
janus_refcount_increase(&handle->ref);
g_hash_table_insert(session->ice_handles, janus_uint64_dup(handle->handle_id), handle);
janus_mutex_unlock(&session->mutex);
}
gint janus_session_handles_remove(janus_session *session, janus_ice_handle *handle) {
janus_mutex_lock(&session->mutex);
gint error = janus_ice_handle_destroy(session, handle);
g_hash_table_remove(session->ice_handles, &handle->handle_id);
janus_mutex_unlock(&session->mutex);
return error;
}
void janus_session_handles_clear(janus_session *session) {
janus_mutex_lock(&session->mutex);
if(session->ice_handles != NULL && g_hash_table_size(session->ice_handles) > 0) {
GHashTableIter iter;
gpointer value;
/* Remove all handles */
g_hash_table_iter_init(&iter, session->ice_handles);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_ice_handle *handle = value;
if(!handle)
continue;
janus_ice_handle_destroy(session, handle);
g_hash_table_iter_remove(&iter);
}
}
janus_mutex_unlock(&session->mutex);
}
json_t *janus_session_handles_list_json(janus_session *session) {
json_t *list = json_array();
janus_mutex_lock(&session->mutex);
if(session->ice_handles != NULL && g_hash_table_size(session->ice_handles) > 0) {
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, session->ice_handles);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
janus_ice_handle *handle = value;
if(!handle)
continue;
json_array_append_new(list, json_integer(handle->handle_id));
}
}
janus_mutex_unlock(&session->mutex);
return list;
}
/* Requests management */
janus_request *janus_request_new(janus_transport *transport, janus_transport_session *instance, void *request_id, gboolean admin, json_t *message) {
janus_request *request = g_malloc(sizeof(janus_request));
request->transport = transport;
request->instance = instance;
janus_refcount_increase(&instance->ref);
request->request_id = request_id;
request->admin = admin;
request->message = message;
return request;
}
void janus_request_destroy(janus_request *request) {
if(request == NULL || request == &exit_message)
return;
request->transport = NULL;
janus_refcount_decrease(&request->instance->ref);
request->instance = NULL;
request->request_id = NULL;
if(request->message)
json_decref(request->message);
request->message = NULL;
g_free(request);
}
static int janus_request_check_secret(janus_request *request, guint64 session_id, const gchar *transaction_text) {
gboolean secret_authorized = FALSE, token_authorized = FALSE;
if(api_secret == NULL && !janus_auth_is_enabled()) {
/* Nothing to check */
secret_authorized = TRUE;
token_authorized = TRUE;
} else {
json_t *root = request->message;
if(api_secret != NULL) {
/* There's an API secret, check that the client provided it */
json_t *secret = json_object_get(root, "apisecret");
if(secret && json_is_string(secret) && janus_strcmp_const_time(json_string_value(secret), api_secret)) {
secret_authorized = TRUE;
}
}
if(janus_auth_is_enabled()) {
/* The token based authentication mechanism is enabled, check that the client provided it */
json_t *token = json_object_get(root, "token");
if(token && json_is_string(token) && janus_auth_check_token(json_string_value(token))) {
token_authorized = TRUE;
}
}
/* We consider a request authorized if either the proper API secret or a valid token has been provided */
if(!secret_authorized && !token_authorized)
return JANUS_ERROR_UNAUTHORIZED;
}
return 0;
}
static void janus_request_ice_handle_answer(janus_ice_handle *handle, int audio, int video, int data, char *jsep_sdp) {
/* We got our answer */
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER);
/* Any pending trickles? */
if(handle->pending_trickles) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Processing %d pending trickle candidates\n", handle->handle_id, g_list_length(handle->pending_trickles));
GList *temp = NULL;
while(handle->pending_trickles) {
temp = g_list_first(handle->pending_trickles);
handle->pending_trickles = g_list_remove_link(handle->pending_trickles, temp);
janus_ice_trickle *trickle = (janus_ice_trickle *)temp->data;
g_list_free(temp);
if(trickle == NULL)
continue;
if((janus_get_monotonic_time() - trickle->received) > candidates_timeout*G_USEC_PER_SEC) {
/* FIXME Candidate is too old, discard it */
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Discarding candidate (too old)\n", handle->handle_id);
janus_ice_trickle_destroy(trickle);
/* FIXME We should report that */
continue;
}
json_t *candidate = trickle->candidate;
if(candidate == NULL) {
janus_ice_trickle_destroy(trickle);
continue;
}
if(json_is_object(candidate)) {
/* We got a single candidate */
int error = 0;
const char *error_string = NULL;
if((error = janus_ice_trickle_parse(handle, candidate, &error_string)) != 0) {
/* FIXME We should report the error parsing the trickle candidate */
}
} else if(json_is_array(candidate)) {
/* We got multiple candidates in an array */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Got multiple candidates (%zu)\n", handle->handle_id, json_array_size(candidate));
if(json_array_size(candidate) > 0) {
/* Handle remote candidates */
size_t i = 0;
for(i=0; i<json_array_size(candidate); i++) {
json_t *c = json_array_get(candidate, i);
/* FIXME We don't care if any trickle fails to parse */
janus_ice_trickle_parse(handle, c, NULL);
}
}
}
/* Done, free candidate */
janus_ice_trickle_destroy(trickle);
}
}
/* This was an answer, check if it's time to start ICE */
if(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_TRICKLE) &&
!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_ALL_TRICKLES)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- ICE Trickling is supported by the browser, waiting for remote candidates...\n", handle->handle_id);
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_START);
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Done! Sending connectivity checks...\n", handle->handle_id);
janus_ice_setup_remote_candidates(handle, handle->stream_id, 1);
}
}
int janus_process_incoming_request(janus_request *request) {
int ret = -1;
if(request == NULL) {
JANUS_LOG(LOG_ERR, "Missing request or payload to process, giving up...\n");
return ret;
}
int error_code = 0;
char error_cause[100];
json_t *root = request->message;
/* Ok, let's start with the ids */
guint64 session_id = 0, handle_id = 0;
json_t *s = json_object_get(root, "session_id");
if(s && json_is_integer(s))
session_id = json_integer_value(s);
json_t *h = json_object_get(root, "handle_id");
if(h && json_is_integer(h))
handle_id = json_integer_value(h);
janus_session *session = NULL;
janus_ice_handle *handle = NULL;
/* Get transaction and message request */
JANUS_VALIDATE_JSON_OBJECT(root, incoming_request_parameters,
error_code, error_cause, FALSE,
JANUS_ERROR_MISSING_MANDATORY_ELEMENT, JANUS_ERROR_INVALID_ELEMENT_TYPE);
if(error_code != 0) {
ret = janus_process_error_string(request, session_id, NULL, error_code, error_cause);
goto jsondone;
}
json_t *transaction = json_object_get(root, "transaction");
const gchar *transaction_text = json_string_value(transaction);
json_t *message = json_object_get(root, "janus");
const gchar *message_text = json_string_value(message);
if(session_id == 0 && handle_id == 0) {
/* Can only be a 'Create new session', a 'Get info' or a 'Ping/Pong' request */
if(!strcasecmp(message_text, "info")) {
ret = janus_process_success(request, janus_info(transaction_text));
goto jsondone;
}
if(!strcasecmp(message_text, "ping")) {
/* Prepare JSON reply */
json_t *reply = janus_create_message("pong", 0, transaction_text);
ret = janus_process_success(request, reply);
goto jsondone;
}
if(strcasecmp(message_text, "create")) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_INVALID_REQUEST_PATH, "Unhandled request '%s' at this path", message_text);
goto jsondone;
}
/* Make sure we're accepting new sessions */
if(!accept_new_sessions) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_NOT_ACCEPTING_SESSIONS, NULL);
goto jsondone;
}
/* Any secret/token to check? */
ret = janus_request_check_secret(request, session_id, transaction_text);
if(ret != 0) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_UNAUTHORIZED, NULL);
goto jsondone;
}
session_id = 0;
json_t *id = json_object_get(root, "id");
if(id != NULL) {
/* The application provided the session ID to use */
session_id = json_integer_value(id);
if(session_id > 0 && (session = janus_session_find(session_id)) != NULL) {
/* Session ID already taken */
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_SESSION_CONFLICT, "Session ID already in use");
goto jsondone;
}
}
/* Handle it */
session = janus_session_create(session_id);
if(session == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_UNKNOWN, "Memory error");
goto jsondone;
}
session_id = session->session_id;
/* We increase the counter as this request is using the session */
janus_refcount_increase(&session->ref);
/* Take note of the request source that originated this session (HTTP, WebSockets, RabbitMQ?) */
session->source = janus_request_new(request->transport, request->instance, NULL, FALSE, NULL);
/* Notify the source that a new session has been created */
request->transport->session_created(request->instance, session->session_id);
/* Notify event handlers */
if(janus_events_is_enabled()) {
/* Session created, add info on the transport that originated it */
json_t *transport = json_object();
json_object_set_new(transport, "transport", json_string(session->source->transport->get_package()));
char id[32];
memset(id, 0, sizeof(id));
g_snprintf(id, sizeof(id), "%p", session->source->instance);
json_object_set_new(transport, "id", json_string(id));
janus_events_notify_handlers(JANUS_EVENT_TYPE_SESSION, session_id, "created", transport);
}
/* Prepare JSON reply */
json_t *reply = janus_create_message("success", 0, transaction_text);
json_t *data = json_object();
json_object_set_new(data, "id", json_integer(session_id));
json_object_set_new(reply, "data", data);
/* Send the success reply */
ret = janus_process_success(request, reply);
goto jsondone;
}
if(session_id < 1) {
JANUS_LOG(LOG_ERR, "Invalid session\n");
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_SESSION_NOT_FOUND, NULL);
goto jsondone;
}
if(h && handle_id < 1) {
JANUS_LOG(LOG_ERR, "Invalid handle\n");
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_SESSION_NOT_FOUND, NULL);
goto jsondone;
}
/* Go on with the processing */
ret = janus_request_check_secret(request, session_id, transaction_text);
if(ret != 0) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_UNAUTHORIZED, NULL);
goto jsondone;
}
/* If we got here, make sure we have a session (and/or a handle) */
session = janus_session_find(session_id);
if(!session) {
JANUS_LOG(LOG_ERR, "Couldn't find any session %"SCNu64"...\n", session_id);
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_SESSION_NOT_FOUND, "No such session %"SCNu64"", session_id);
goto jsondone;
}
/* Update the last activity timer */
session->last_activity = janus_get_monotonic_time();
handle = NULL;
if(handle_id > 0) {
handle = janus_session_handles_find(session, handle_id);
if(!handle) {
JANUS_LOG(LOG_ERR, "Couldn't find any handle %"SCNu64" in session %"SCNu64"...\n", handle_id, session_id);
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_HANDLE_NOT_FOUND, "No such handle %"SCNu64" in session %"SCNu64"", handle_id, session_id);
goto jsondone;
}
}
/* What is this? */
if(!strcasecmp(message_text, "keepalive")) {
/* Just a keep-alive message, reply with an ack */
JANUS_LOG(LOG_VERB, "Got a keep-alive on session %"SCNu64"\n", session_id);
json_t *reply = janus_create_message("ack", session_id, transaction_text);
/* Send the success reply */
ret = janus_process_success(request, reply);
} else if(!strcasecmp(message_text, "attach")) {
if(handle != NULL) {
/* Attach is a session-level command */
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_INVALID_REQUEST_PATH, "Unhandled request '%s' at this path", message_text);
goto jsondone;
}
JANUS_VALIDATE_JSON_OBJECT(root, attach_parameters,
error_code, error_cause, FALSE,
JANUS_ERROR_MISSING_MANDATORY_ELEMENT, JANUS_ERROR_INVALID_ELEMENT_TYPE);
if(error_code != 0) {
ret = janus_process_error_string(request, session_id, transaction_text, error_code, error_cause);
goto jsondone;
}
json_t *plugin = json_object_get(root, "plugin");
const gchar *plugin_text = json_string_value(plugin);
janus_plugin *plugin_t = janus_plugin_find(plugin_text);
if(plugin_t == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_NOT_FOUND, "No such plugin '%s'", plugin_text);
goto jsondone;
}
/* If the auth token mechanism is enabled, we should check if this token can access this plugin */
if(janus_auth_is_enabled()) {
json_t *token = json_object_get(root, "token");
if(token != NULL) {
const char *token_value = json_string_value(token);
if(token_value && !janus_auth_check_plugin(token_value, plugin_t)) {
JANUS_LOG(LOG_ERR, "Token '%s' can't access plugin '%s'\n", token_value, plugin_text);
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_UNAUTHORIZED_PLUGIN, "Provided token can't access plugin '%s'", plugin_text);
goto jsondone;
}
}
}
json_t *opaque = json_object_get(root, "opaque_id");
const char *opaque_id = opaque ? json_string_value(opaque) : NULL;
/* Create handle */
handle = janus_ice_handle_create(session, opaque_id);
if(handle == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_UNKNOWN, "Memory error");
goto jsondone;
}
handle_id = handle->handle_id;
/* We increase the counter as this request is using the handle */
janus_refcount_increase(&handle->ref);
/* Attach to the plugin */
int error = 0;
if((error = janus_ice_handle_attach_plugin(session, handle, plugin_t)) != 0) {
/* TODO Make error struct to pass verbose information */
janus_session_handles_remove(session, handle);
JANUS_LOG(LOG_ERR, "Couldn't attach to plugin '%s', error '%d'\n", plugin_text, error);
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_ATTACH, "Couldn't attach to plugin: error '%d'", error);
goto jsondone;
}
/* Prepare JSON reply */
json_t *reply = janus_create_message("success", session_id, transaction_text);
json_t *data = json_object();
json_object_set_new(data, "id", json_integer(handle_id));
json_object_set_new(reply, "data", data);
/* Send the success reply */