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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 gateway core. This code takes care of
* the gateway 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 <poll.h>
#include "janus.h"
#include "cmdline.h"
#include "config.h"
#include "apierror.h"
#include "log.h"
#include "debug.h"
#include "rtcp.h"
#include "auth.h"
#include "events.h"
#define JANUS_NAME "Janus WebRTC Gateway"
#define JANUS_AUTHOR "Meetecho s.r.l."
#define JANUS_VERSION 22
#define JANUS_VERSION_STRING "0.2.2"
#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];
/* 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 allow_token_parameters[] = {
{"token", JSON_STRING, JANUS_JSON_PARAM_REQUIRED},
{"plugins", JSON_ARRAY, JANUS_JSON_PARAM_REQUIRED | JANUS_JSON_PARAM_NONEMPTY}
};
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 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}
};
/* 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[INET6_ADDRSTRLEN];
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;
/* Information */
json_t *janus_info(const char *transaction);
json_t *janus_info(const char *transaction) {
/* Prepare a summary on the gateway */
json_t *info = json_object();
json_object_set_new(info, "janus", json_string("server_info"));
if(transaction != NULL)
json_object_set_new(info, "transaction", json_string(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, "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, "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-tcp", janus_ice_is_ice_tcp_enabled() ? json_true() : json_false());
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, "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());
/* 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;
/*! \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 gateway, 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 gateway core, as part of
* the janus_transport_callbacks interface. Everything the transport
* plugins send the gateway is handled here.
*/
///@{
void janus_transport_incoming_request(janus_transport *plugin, void *transport, void *request_id, gboolean admin, json_t *message, json_error_t *error);
void janus_transport_gone(janus_transport *plugin, void *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,
};
GThreadPool *tasks = NULL;
void janus_transport_task(gpointer data, gpointer user_data);
///@}
/** @name Plugin callback interface
* These are the callbacks implemented by the gateway core, as part of
* the janus_callbacks interface. Everything the plugins send the
* gateway 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);
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 *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);
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,
};
///@}
/* Gateway Sessions */
static janus_mutex sessions_mutex;
static GHashTable *sessions = NULL, *old_sessions = NULL;
static GMainContext *sessions_watchdog_context = NULL;
#define SESSION_TIMEOUT 60 /* FIXME Should this be higher, e.g., 120 seconds? */
static gboolean janus_cleanup_session(gpointer user_data) {
janus_session *session = (janus_session *) user_data;
JANUS_LOG(LOG_DBG, "Cleaning up session %"SCNu64"...\n", session->session_id);
janus_session_destroy(session->session_id);
return G_SOURCE_REMOVE;
}
static gboolean janus_check_sessions(gpointer user_data) {
GMainContext *watchdog_context = (GMainContext *) user_data;
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 || session->destroy) {
continue;
}
gint64 now = janus_get_monotonic_time();
if (now - session->last_activity >= SESSION_TIMEOUT * G_USEC_PER_SEC && !session->timeout) {
JANUS_LOG(LOG_INFO, "Timeout expired for session %"SCNu64"...\n", session->session_id);
/* Notify the transport */
if(session->source) {
json_t *event = json_object();
json_object_set_new(event, "janus", json_string("timeout"));
json_object_set_new(event, "session_id", json_integer(session->session_id));
/* Send this to the transport client */
session->source->transport->send_message(session->source->instance, NULL, FALSE, event);
/* Notify the transport plugin about the session timeout */
session->source->transport->session_over(session->source->instance, session->session_id, TRUE);
}
/* Notify event handlers as well */
if(janus_events_is_enabled())
janus_events_notify_handlers(JANUS_EVENT_TYPE_SESSION, session->session_id, "timeout", NULL);
/* Mark the session as over, we'll deal with it later */
session->timeout = 1;
/* FIXME Is this safe? apparently it causes hash table errors on the console */
g_hash_table_iter_remove(&iter);
g_hash_table_insert(old_sessions, janus_uint64_dup(session->session_id), session);
/* Schedule the session for deletion */
GSource *timeout_source = g_timeout_source_new_seconds(3);
g_source_set_callback(timeout_source, janus_cleanup_session, session, NULL);
g_source_attach(timeout_source, watchdog_context);
g_source_unref(timeout_source);
}
}
}
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);
return NULL;
}
janus_session *janus_session_create(guint64 session_id) {
if(session_id == 0) {
while(session_id == 0) {
session_id = janus_random_uint64();
if(janus_session_find(session_id) != NULL) {
/* Session ID already taken, try another one */
session_id = 0;
}
}
}
JANUS_LOG(LOG_INFO, "Creating new session: %"SCNu64"\n", session_id);
janus_session *session = (janus_session *)g_malloc0(sizeof(janus_session));
if(session == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
session->session_id = session_id;
session->source = NULL;
session->destroy = 0;
session->timeout = 0;
session->last_activity = janus_get_monotonic_time();
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);
janus_mutex_unlock(&sessions_mutex);
return session;
}
janus_session *janus_session_find_destroyed(guint64 session_id) {
janus_mutex_lock(&sessions_mutex);
janus_session *session = g_hash_table_lookup(old_sessions, &session_id);
janus_mutex_unlock(&sessions_mutex);
return session;
}
void janus_session_notify_event(guint64 session_id, json_t *event) {
janus_mutex_lock(&sessions_mutex);
janus_session *session = sessions ? g_hash_table_lookup(sessions, &session_id) : NULL;
if(session != NULL && !session->destroy && session->source != NULL && session->source->transport != NULL) {
janus_mutex_unlock(&sessions_mutex);
/* 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 {
janus_mutex_unlock(&sessions_mutex);
/* 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(guint64 session_id) {
janus_session *session = janus_session_find_destroyed(session_id);
if(session == NULL) {
JANUS_LOG(LOG_ERR, "Couldn't find session to destroy: %"SCNu64"\n", session_id);
return -1;
}
JANUS_LOG(LOG_VERB, "Destroying session %"SCNu64"\n", session_id);
session->destroy = 1;
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 || g_atomic_int_get(&stop)) {
continue;
}
janus_ice_handle_destroy(session, handle->handle_id);
g_hash_table_iter_remove(&iter);
}
}
/* FIXME Actually destroy session */
janus_session_free(session);
return 0;
}
void janus_session_free(janus_session *session) {
if(session == NULL)
return;
janus_mutex_lock(&session->mutex);
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;
}
janus_mutex_unlock(&session->mutex);
g_free(session);
session = NULL;
}
/* Requests management */
janus_request *janus_request_new(janus_transport *transport, void *instance, void *request_id, gboolean admin, json_t *message) {
janus_request *request = (janus_request *)g_malloc0(sizeof(janus_request));
request->transport = transport;
request->instance = instance;
request->request_id = request_id;
request->admin = admin;
request->message = message;
return request;
}
void janus_request_destroy(janus_request *request) {
if(request == NULL)
return;
request->transport = NULL;
request->instance = NULL;
request->request_id = NULL;
if(request->message)
json_decref(request->message);
request->message = NULL;
g_free(request);
}
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);
/* 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 = json_object();
json_object_set_new(reply, "janus", json_string("pong"));
json_object_set_new(reply, "transaction", json_string(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;
}
/* Any secret/token to check? */
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 {
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) {
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 && 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 */
janus_session *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;
/* 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 = json_object();
json_object_set_new(reply, "janus", json_string("success"));
json_object_set_new(reply, "transaction", json_string(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 */
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 {
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) {
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) */
janus_session *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();
janus_ice_handle *handle = NULL;
if(handle_id > 0) {
handle = janus_ice_handle_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 = json_object();
json_object_set_new(reply, "janus", json_string("ack"));
json_object_set_new(reply, "session_id", json_integer(session_id));
json_object_set_new(reply, "transaction", json_string(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, NULL, 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;
/* Attach to the plugin */
int error = 0;
if((error = janus_ice_handle_attach_plugin(session, handle_id, plugin_t)) != 0) {
/* TODO Make error struct to pass verbose information */
janus_ice_handle_destroy(session, handle_id);
janus_mutex_lock(&session->mutex);
g_hash_table_remove(session->ice_handles, &handle_id);
janus_mutex_unlock(&session->mutex);
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 = json_object();
json_object_set_new(reply, "janus", json_string("success"));
json_object_set_new(reply, "session_id", json_integer(session_id));
json_object_set_new(reply, "transaction", json_string(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 */
ret = janus_process_success(request, reply);
} else if(!strcasecmp(message_text, "destroy")) {
if(handle != NULL) {
/* Query 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;
}
/* Schedule the session for deletion */
session->destroy = 1;
janus_mutex_lock(&sessions_mutex);
g_hash_table_remove(sessions, &session->session_id);
g_hash_table_insert(old_sessions, janus_uint64_dup(session->session_id), session);
GSource *timeout_source = g_timeout_source_new_seconds(3);
g_source_set_callback(timeout_source, janus_cleanup_session, session, NULL);
g_source_attach(timeout_source, sessions_watchdog_context);
g_source_unref(timeout_source);
janus_mutex_unlock(&sessions_mutex);
/* Notify the source that the session has been destroyed */
if(session->source && session->source->transport)
session->source->transport->session_over(session->source->instance, session->session_id, FALSE);
/* Prepare JSON reply */
json_t *reply = json_object();
json_object_set_new(reply, "janus", json_string("success"));
json_object_set_new(reply, "session_id", json_integer(session_id));
json_object_set_new(reply, "transaction", json_string(transaction_text));
/* Send the success reply */
ret = janus_process_success(request, reply);
/* Notify event handlers as well */
if(janus_events_is_enabled())
janus_events_notify_handlers(JANUS_EVENT_TYPE_SESSION, session_id, "destroyed", NULL);
} else if(!strcasecmp(message_text, "detach")) {
if(handle == NULL) {
/* Query is an handle-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;
}
if(handle->app == NULL || handle->app_handle == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_DETACH, "No plugin to detach from");
goto jsondone;
}
int error = janus_ice_handle_destroy(session, handle_id);
janus_mutex_lock(&session->mutex);
g_hash_table_remove(session->ice_handles, &handle_id);
janus_mutex_unlock(&session->mutex);
if(error != 0) {
/* TODO Make error struct to pass verbose information */
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_DETACH, "Couldn't detach from plugin: error '%d'", error);
/* TODO Delete handle instance */
goto jsondone;
}
/* Prepare JSON reply */
json_t *reply = json_object();
json_object_set_new(reply, "janus", json_string("success"));
json_object_set_new(reply, "session_id", json_integer(session_id));
json_object_set_new(reply, "transaction", json_string(transaction_text));
/* Send the success reply */
ret = janus_process_success(request, reply);
} else if(!strcasecmp(message_text, "hangup")) {
if(handle == NULL) {
/* Query is an handle-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;
}
if(handle->app == NULL || handle->app_handle == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_DETACH, "No plugin attached");
goto jsondone;
}
janus_ice_webrtc_hangup(handle);
/* Prepare JSON reply */
json_t *reply = json_object();
json_object_set_new(reply, "janus", json_string("success"));
json_object_set_new(reply, "session_id", json_integer(session_id));
json_object_set_new(reply, "transaction", json_string(transaction_text));
/* Send the success reply */
ret = janus_process_success(request, reply);
} else if(!strcasecmp(message_text, "message")) {
if(handle == NULL) {
/* Query is an handle-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;
}
if(handle->app == NULL || handle->app_handle == NULL) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_PLUGIN_MESSAGE, "No plugin to handle this message");
goto jsondone;
}
janus_plugin *plugin_t = (janus_plugin *)handle->app;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] There's a message for %s\n", handle->handle_id, plugin_t->get_name());
JANUS_VALIDATE_JSON_OBJECT(root, body_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 *body = json_object_get(root, "body");
/* Is there an SDP attached? */
json_t *jsep = json_object_get(root, "jsep");
char *jsep_type = NULL;
char *jsep_sdp = NULL, *jsep_sdp_stripped = NULL;
if(jsep != NULL) {
if(!json_is_object(jsep)) {
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_INVALID_JSON_OBJECT, "Invalid jsep object");
goto jsondone;
}
JANUS_VALIDATE_JSON_OBJECT_FORMAT("JSEP error: missing mandatory element (%s)",
"JSEP error: invalid element type (%s should be %s)",
jsep, jsep_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 *type = json_object_get(jsep, "type");
jsep_type = g_strdup(json_string_value(type));
type = NULL;
gboolean do_trickle = TRUE;
json_t *jsep_trickle = json_object_get(jsep, "trickle");
do_trickle = jsep_trickle ? json_is_true(jsep_trickle) : TRUE;
/* Are we still cleaning up from a previous media session? */
if(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_CLEANING)) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Still cleaning up from a previous media session, let's wait a bit...\n", handle->handle_id);
gint64 waited = 0;
while(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_CLEANING)) {
g_usleep(100000);
waited += 100000;
if(waited >= 3*G_USEC_PER_SEC) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Waited 3 seconds, that's enough!\n", handle->handle_id);
break;
}
}
}
/* Check the JSEP type */
janus_mutex_lock(&handle->mutex);
int offer = 0;
if(!strcasecmp(jsep_type, "offer")) {
offer = 1;
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER);
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_GOT_OFFER);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_GOT_ANSWER);
} else if(!strcasecmp(jsep_type, "answer")) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_GOT_ANSWER);
offer = 0;
} else {
/* TODO Handle other message types as well */
ret = janus_process_error(request, session_id, transaction_text, JANUS_ERROR_JSEP_UNKNOWN_TYPE, "JSEP error: unknown message type '%s'", jsep_type);
g_free(jsep_type);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER);
janus_mutex_unlock(&handle->mutex);
goto jsondone;
}
json_t *sdp = json_object_get(jsep, "sdp");
jsep_sdp = (char *)json_string_value(sdp);
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Remote SDP:\n%s", handle->handle_id, jsep_sdp);
/* Is this valid SDP? */
char error_str[512];
int audio = 0, video = 0, data = 0, bundle = 0, rtcpmux = 0, trickle = 0;
janus_sdp *parsed_sdp = janus_sdp_preparse(jsep_sdp, error_str, sizeof(error_str), &audio, &video, &data, &bundle, &rtcpmux, &trickle);
trickle = trickle && do_trickle;
if(parsed_sdp == NULL) {
/* Invalid SDP */
ret = janus_process_error_string(request, session_id, transaction_text, JANUS_ERROR_JSEP_INVALID_SDP, error_str);
g_free(jsep_type);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER);
janus_mutex_unlock(&handle->mutex);
goto jsondone;
}
/* Notify event handlers */
if(janus_events_is_enabled()) {
janus_events_notify_handlers(JANUS_EVENT_TYPE_JSEP,