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janus.c
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/*! \file janus.c
* \author Lorenzo Miniero <lorenzo@meetecho.com>
* \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 implements the transports (HTTP, WebSockets, RabbitMQ) and Janus
* protocol (a JSON-based protocol implemented) to interact with the web
* applications. The core also takes care of bridging peers and plugins
* accordingly.
*
* \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/socket.h>
#include "janus.h"
#include "cmdline.h"
#include "config.h"
#include "apierror.h"
#include "debug.h"
#include "rtcp.h"
#include "sdp.h"
#include "utils.h"
#define JANUS_NAME "Janus WebRTC Gateway"
#define JANUS_AUTHOR "Meetecho s.r.l."
#define JANUS_VERSION 9
#define JANUS_VERSION_STRING "0.0.9"
#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 *plugins = NULL;
static GHashTable *plugins_so = NULL;
/* MHD Web Server */
static struct MHD_Daemon *ws = NULL, *sws = NULL;
static char *ws_path = NULL;
static char *ws_api_secret = NULL;
#ifdef HAVE_WEBSOCKETS
/* libwebsockets WS context(s) */
static struct libwebsocket_context *wss = NULL, *swss = NULL;
/* libwebsockets sessions that have been closed */
static GList *old_wss;
static janus_mutex old_wss_mutex;
/* Callback for HTTP-related events (automatically rejected) */
static int janus_wss_callback_http(struct libwebsocket_context *this,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len);
/* Callback for WebSockets-related events */
static int janus_wss_callback(struct libwebsocket_context *this,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len);
/* Protocol mapping */
static struct libwebsocket_protocols wss_protocols[] = {
{ "http-only", janus_wss_callback_http, 0, 0 },
{ "janus-protocol", janus_wss_callback, sizeof(janus_websocket_client), 0 },
{ NULL, NULL, 0 }
};
/* Helper for debugging reasons */
const char *janus_wss_reason_string(enum libwebsocket_callback_reasons reason);
#endif
#ifdef HAVE_RABBITMQ
/* RabbitMQ support */
amqp_connection_state_t rmq_conn = NULL;
amqp_channel_t rmq_channel = 0;
amqp_bytes_t to_janus_queue, from_janus_queue;
#endif
/* Admin/Monitor MHD Web Server */
static struct MHD_Daemon *admin_ws = NULL, *admin_sws = NULL;
static char *admin_ws_path = NULL;
static char *admin_ws_api_secret = NULL;
/* Admin/Monitor ACL list */
GList *janus_admin_access_list = NULL;
janus_mutex access_list_mutex;
void janus_admin_allow_address(const char *ip);
void janus_admin_allow_address(const char *ip) {
if(ip == NULL)
return;
/* Is this an IP or an interface? */
janus_mutex_lock(&access_list_mutex);
janus_admin_access_list = g_list_append(janus_admin_access_list, (gpointer)ip);
janus_mutex_unlock(&access_list_mutex);
}
gboolean janus_admin_is_allowed(const char *ip);
gboolean janus_admin_is_allowed(const char *ip) {
if(ip == NULL)
return FALSE;
if(janus_admin_access_list == NULL)
return TRUE;
janus_mutex_lock(&access_list_mutex);
GList *temp = janus_admin_access_list;
while(temp) {
const char *allowed = (const char *)temp->data;
if(allowed != NULL && strstr(ip, allowed)) {
janus_mutex_unlock(&access_list_mutex);
return TRUE;
}
temp = temp->next;
}
janus_mutex_unlock(&access_list_mutex);
return FALSE;
}
/* Admin/Monitor helpers */
json_t *janus_admin_stream_summary(janus_ice_stream *stream);
json_t *janus_admin_component_summary(janus_ice_component *component);
/* Certificates */
static char *server_pem = NULL;
gchar *janus_get_server_pem(void) {
return server_pem;
}
static char *server_key = NULL;
gchar *janus_get_server_key(void) {
return server_key;
}
/* Information */
char *janus_info(const char *transaction);
char *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));
#ifdef HAVE_SCTP
json_object_set_new(info, "data_channels", json_string("true"));
#else
json_object_set_new(info, "data_channels", json_string("false"));
#endif
#ifdef HAVE_WEBSOCKETS
json_object_set_new(info, "websockets", json_string("true"));
#else
json_object_set_new(info, "websockets", json_string("false"));
#endif
#ifdef HAVE_RABBITMQ
json_object_set_new(info, "rabbitmq", json_string("true"));
#else
json_object_set_new(info, "rabbitmq", json_string("false"));
#endif
json_object_set_new(info, "ipv6", json_string(janus_ice_is_ipv6_enabled() ? "true" : "false"));
json_object_set_new(info, "ice-tcp", json_string(janus_ice_is_ice_tcp_enabled() ? "true" : "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_t *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(data, p->get_package(), plugin);
}
}
json_object_set_new(info, "plugins", data);
/* Convert to a string */
char *info_text = json_dumps(info, JSON_INDENT(3) | JSON_PRESERVE_ORDER);
json_decref(info);
return info_text;
}
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) {
if(ip == NULL)
return;
if(public_ip != NULL)
g_free(public_ip);
public_ip = g_strdup(ip);
}
static volatile gint stop = 0;
gint janus_is_stopping(void) {
return g_atomic_int_get(&stop);
}
/* Logging */
int log_level = 0;
int log_timestamps = 0;
int lock_debug = 0;
/*! \brief Signal handler (just used to intercept CTRL+C) */
void janus_handle_signal(int signum);
void janus_handle_signal(int 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);
}
/** @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_push_event(janus_plugin_session *plugin_session, janus_plugin *plugin, const char *transaction, const char *message, const char *sdp_type, const char *sdp);
json_t *janus_handle_sdp(janus_plugin_session *plugin_session, janus_plugin *plugin, const char *sdp_type, const char *sdp);
void janus_relay_rtp(janus_plugin_session *plugin_session, int video, char *buf, int len);
void janus_relay_rtcp(janus_plugin_session *plugin_session, int video, char *buf, int len);
void janus_relay_data(janus_plugin_session *plugin_session, char *buf, int len);
void janus_close_pc(janus_plugin_session *plugin_session);
void janus_end_session(janus_plugin_session *plugin_session);
static janus_callbacks janus_handler_plugin =
{
.push_event = janus_push_event,
.relay_rtp = janus_relay_rtp,
.relay_rtcp = janus_relay_rtcp,
.relay_data = janus_relay_data,
.close_pc = janus_close_pc,
.end_session = janus_end_session,
};
///@}
#ifdef HAVE_RABBITMQ
/* FIXME RabbitMQ session (always 1 at the moment) */
janus_rabbitmq_client *rmq_client = NULL;
#endif
/* 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);
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));
gchar *event_text = json_dumps(event, JSON_INDENT(3) | JSON_PRESERVE_ORDER);
json_decref(event);
janus_http_event *notification = calloc(1, sizeof(janus_http_event));
notification->code = 200;
notification->payload = event_text;
notification->allocated = 1;
g_async_queue_push(session->messages, notification);
#ifdef HAVE_WEBSOCKETS
janus_request_source *source = (janus_request_source *)session->source;
if(source != NULL && source->type == JANUS_SOURCE_WEBSOCKETS) {
/* Send this as soon as the WebSocket becomes writeable */
janus_websocket_client *client = (janus_websocket_client *)source->source;
/* Make sure this is not related to a closed WebSocket session */
janus_mutex_lock(&old_wss_mutex);
if(g_list_find(old_wss, client) == NULL) {
janus_mutex_lock(&client->mutex);
libwebsocket_callback_on_writable(client->context, client->wsi);
janus_mutex_unlock(&client->mutex);
}
janus_mutex_unlock(&old_wss_mutex);
}
#endif
session->timeout = 1;
g_hash_table_iter_remove(&iter);
g_hash_table_insert(old_sessions, GUINT_TO_POINTER(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 = g_random_int();
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 *)calloc(1, sizeof(janus_session));
if(session == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
session->session_id = session_id;
session->messages = g_async_queue_new_full((GDestroyNotify) janus_http_event_free);
session->destroy = 0;
session->last_activity = janus_get_monotonic_time();
janus_mutex_init(&session->mutex);
janus_mutex_lock(&sessions_mutex);
g_hash_table_insert(sessions, GUINT_TO_POINTER(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, GUINT_TO_POINTER(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, GUINT_TO_POINTER(session_id));
janus_mutex_unlock(&sessions_mutex);
return session;
}
void janus_session_notify_event(guint64 session_id, janus_http_event *event) {
janus_mutex_lock(&sessions_mutex);
janus_session *session = g_hash_table_lookup(sessions, GUINT_TO_POINTER(session_id));
janus_mutex_unlock(&sessions_mutex);
if(session != NULL) {
g_async_queue_push(session->messages, event);
#ifdef HAVE_WEBSOCKETS
janus_request_source *source = (janus_request_source *)session->source;
if(source != NULL && source->type == JANUS_SOURCE_WEBSOCKETS) {
/* Send this as soon as the WebSocket becomes writeable */
janus_websocket_client *client = (janus_websocket_client *)source->source;
/* Make sure this is not related to a closed WebSocket session */
janus_mutex_lock(&old_wss_mutex);
if(g_list_find(old_wss, client) == NULL) {
janus_mutex_lock(&client->mutex);
libwebsocket_callback_on_writable(client->context, client->wsi);
janus_mutex_unlock(&client->mutex);
}
janus_mutex_unlock(&old_wss_mutex);
}
#endif
}
}
/* 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->messages != NULL) {
g_async_queue_unref(session->messages);
session->messages = NULL;
}
janus_request_source *source = (janus_request_source *)session->source;
if(source != NULL) {
janus_request_source_destroy(source);
session->source = NULL;
}
janus_mutex_unlock(&session->mutex);
g_free(session);
session = NULL;
}
/* Connection notifiers */
int janus_ws_client_connect(void *cls, const struct sockaddr *addr, socklen_t addrlen) {
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
char *ip = inet_ntoa(sin->sin_addr);
JANUS_LOG(LOG_HUGE, "New connection on REST API: %s\n", ip);
/* TODO Implement access limitation based on IP addresses */
return MHD_YES;
}
int janus_admin_ws_client_connect(void *cls, const struct sockaddr *addr, socklen_t addrlen) {
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
char *ip = inet_ntoa(sin->sin_addr);
JANUS_LOG(LOG_HUGE, "New connection on admin/monitor: %s\n", ip);
/* Any access limitation based on this IP address? */
if(!janus_admin_is_allowed(ip)) {
JANUS_LOG(LOG_ERR, "IP %s is unauthorized to connect to the admin/monitor interface\n", ip);
return MHD_NO;
}
return MHD_YES;
}
/* WebServer requests handler */
int janus_ws_handler(void *cls, struct MHD_Connection *connection, const char *url, const char *method, const char *version, const char *upload_data, size_t *upload_data_size, void **ptr)
{
char *payload = NULL;
struct MHD_Response *response = NULL;
int ret = MHD_NO;
gchar *session_path = NULL, *handle_path = NULL;
gchar **basepath = NULL, **path = NULL;
/* Is this the first round? */
int firstround = 0;
janus_http_msg *msg = (janus_http_msg *)*ptr;
if (msg == NULL) {
firstround = 1;
JANUS_LOG(LOG_VERB, "Got a HTTP %s request on %s...\n", method, url);
JANUS_LOG(LOG_DBG, " ... Just parsing headers for now...\n");
msg = calloc(1, sizeof(janus_http_msg));
if(msg == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
MHD_destroy_response(response);
goto done;
}
msg->acrh = NULL;
msg->acrm = NULL;
msg->payload = NULL;
msg->len = 0;
msg->session_id = 0;
*ptr = msg;
MHD_get_connection_values(connection, MHD_HEADER_KIND, &janus_ws_headers, msg);
ret = MHD_YES;
} else {
JANUS_LOG(LOG_DBG, "Processing HTTP %s request on %s...\n", method, url);
}
/* Parse request */
if (strcasecmp(method, "GET") && strcasecmp(method, "POST") && strcasecmp(method, "OPTIONS")) {
JANUS_LOG(LOG_ERR, "Unsupported method...\n");
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_IMPLEMENTED, response);
MHD_destroy_response(response);
return ret;
}
if (!strcasecmp(method, "OPTIONS")) {
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
}
/* Get path components */
if(strcasecmp(url, ws_path)) {
if(strlen(ws_path) > 1) {
basepath = g_strsplit(url, ws_path, -1);
} else {
/* The base path is the web server too itself, we process the url itself */
basepath = calloc(3, sizeof(char *));
basepath[0] = g_strdup("/");
basepath[1] = g_strdup(url);
}
if(basepath[1] == NULL || basepath[1][0] != '/') {
JANUS_LOG(LOG_ERR, "Invalid url %s (%s)\n", url, basepath[1]);
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response(response);
}
if(firstround) {
g_strfreev(basepath);
return ret;
}
path = g_strsplit(basepath[1], "/", -1);
if(path == NULL || path[1] == NULL) {
JANUS_LOG(LOG_ERR, "Invalid path %s (%s)\n", basepath[1], path[1]);
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response(response);
}
}
if(firstround)
return ret;
JANUS_LOG(LOG_DBG, " ... parsing request...\n");
if(path != NULL && path[1] != NULL && strlen(path[1]) > 0) {
session_path = g_strdup(path[1]);
if(session_path == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
MHD_destroy_response(response);
goto done;
}
JANUS_LOG(LOG_HUGE, "Session: %s\n", session_path);
}
if(session_path != NULL && path[2] != NULL && strlen(path[2]) > 0) {
handle_path = g_strdup(path[2]);
if(handle_path == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
MHD_destroy_response(response);
goto done;
}
JANUS_LOG(LOG_HUGE, "Handle: %s\n", handle_path);
}
if(session_path != NULL && handle_path != NULL && path[3] != NULL && strlen(path[3]) > 0) {
JANUS_LOG(LOG_ERR, "Too many components...\n");
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response(response);
goto done;
}
/* Get payload, if any */
if(!strcasecmp(method, "POST")) {
JANUS_LOG(LOG_HUGE, "Processing POST data (%s) (%zu bytes)...\n", msg->contenttype, *upload_data_size);
if(*upload_data_size != 0) {
if(msg->payload == NULL)
msg->payload = calloc(1, *upload_data_size+1);
else
msg->payload = realloc(msg->payload, msg->len+*upload_data_size+1);
if(msg->payload == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
MHD_destroy_response(response);
goto done;
}
memcpy(msg->payload+msg->len, upload_data, *upload_data_size);
msg->len += *upload_data_size;
memset(msg->payload + msg->len, '\0', 1);
JANUS_LOG(LOG_DBG, " -- Data we have now (%zu bytes)\n", msg->len);
*upload_data_size = 0; /* Go on */
ret = MHD_YES;
goto done;
}
JANUS_LOG(LOG_DBG, "Done getting payload, we can answer\n");
if(msg->payload == NULL) {
JANUS_LOG(LOG_ERR, "No payload :-(\n");
ret = MHD_NO;
goto done;
}
payload = msg->payload;
JANUS_LOG(LOG_HUGE, "%s\n", payload);
}
/* Process the request, specifying this HTTP connection is the source */
janus_request_source source = {
.type = JANUS_SOURCE_PLAIN_HTTP,
.source = (void *)connection,
.msg = (void *)msg,
};
/* Is this a generic request for info? */
if(session_path != NULL && !strcmp(session_path, "info")) {
/* The info REST endpoint, if contacted through a GET, provides information on the gateway */
if(strcasecmp(method, "GET")) {
ret = janus_process_error(&source, 0, NULL, JANUS_ERROR_USE_GET, "Use GET for the info endpoint");
goto done;
}
/* Send the success reply */
ret = janus_process_success(&source, "application/json", janus_info(NULL));
goto done;
}
/* Or maybe a long poll */
if(!strcasecmp(method, "GET") || !payload) {
guint64 session_id = session_path ? g_ascii_strtoll(session_path, NULL, 10) : 0;
if(session_id < 1) {
JANUS_LOG(LOG_ERR, "Invalid session %s\n", session_path);
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response(response);
goto done;
}
msg->session_id = session_id;
if(handle_path) {
char *location = (char *)calloc(strlen(ws_path) + strlen(session_path) + 2, sizeof(char));
g_sprintf(location, "%s/%s", ws_path, session_path);
JANUS_LOG(LOG_ERR, "Invalid GET to %s, redirecting to %s\n", url, location);
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Location", location);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, 302, response);
MHD_destroy_response(response);
g_free(location);
goto done;
}
janus_session *session = janus_session_find(session_id);
if(!session) {
JANUS_LOG(LOG_ERR, "Couldn't find any session %"SCNu64"...\n", session_id);
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response(response);
goto done;
}
if(ws_api_secret != NULL) {
/* There's an API secret, check that the client provided it */
const char *secret = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "apisecret");
if(!secret || !janus_strcmp_const_time(secret, ws_api_secret)) {
response = MHD_create_response_from_data(0, NULL, MHD_NO, MHD_NO);
MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
if(msg->acrm)
MHD_add_response_header(response, "Access-Control-Allow-Methods", msg->acrm);
if(msg->acrh)
MHD_add_response_header(response, "Access-Control-Allow-Headers", msg->acrh);
ret = MHD_queue_response(connection, MHD_HTTP_FORBIDDEN, response);
MHD_destroy_response(response);
goto done;
}
}
/* Update the last activity timer */
session->last_activity = janus_get_monotonic_time();
/* How many messages can we send back in a single response? (just one by default) */
int max_events = 1;
const char *maxev = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "maxev");
if(maxev != NULL) {
max_events = atoi(maxev);
if(max_events < 1) {
JANUS_LOG(LOG_WARN, "Invalid maxev parameter passed (%d), defaulting to 1\n", max_events);
max_events = 1;
}
}
JANUS_LOG(LOG_VERB, "Session %"SCNu64" found... returning up to %d messages\n", session->session_id, max_events);
/* Handle GET, taking the first message from the list */
janus_http_event *event = g_async_queue_try_pop(session->messages);
if(event != NULL) {
if(max_events == 1) {
/* Return just this message and leave */
ret = janus_process_success(&source, "application/json", event->payload);
} else {
/* The application is willing to receive more events at the same time, anything to report? */
json_t *list = json_array();
json_error_t error;
if(event->payload) {
json_t *ev = json_loads(event->payload, 0, &error);
if(ev && json_is_object(ev)) /* FIXME Should we fail if this is not valid JSON? */
json_array_append_new(list, ev);
g_free(event->payload);
event->payload = NULL;
}
g_free(event);
event = NULL;
int events = 1;
while(events < max_events) {
event = g_async_queue_try_pop(session->messages);
if(event == NULL)
break;
if(event->payload) {
json_t *ev = json_loads(event->payload, 0, &error);
if(ev && json_is_object(ev)) /* FIXME Should we fail if this is not valid JSON? */
json_array_append_new(list, ev);
g_free(event->payload);
event->payload = NULL;
}
g_free(event);
event = NULL;
events++;
}
/* Return the array of messages and leave */
char *event_text = json_dumps(list, JSON_INDENT(3) | JSON_PRESERVE_ORDER);
json_decref(list);
ret = janus_process_success(&source, "application/json", event_text);
}
} else {
/* Still no message, wait */
ret = janus_ws_notifier(&source, max_events);
}
goto done;
}
/* Parse the JSON payload */
json_error_t error;
json_t *root = json_loads(payload, 0, &error);
if(!root) {
ret = janus_process_error(&source, 0, NULL, JANUS_ERROR_INVALID_JSON, "JSON error: on line %d: %s", error.line, error.text);
goto done;
}
if(!json_is_object(root)) {
ret = janus_process_error(&source, 0, NULL, JANUS_ERROR_INVALID_JSON_OBJECT, "JSON error: not an object");
json_decref(root);
goto done;
}
/* Check if we have session and handle identifiers */
guint64 session_id = session_path ? g_ascii_strtoll(session_path, NULL, 10) : 0;
guint64 handle_id = handle_path ? g_ascii_strtoll(handle_path, NULL, 10) : 0;
if(session_id > 0)
json_object_set_new(root, "session_id", json_integer(session_id));
if(handle_id > 0)
json_object_set_new(root, "handle_id", json_integer(handle_id));
ret = janus_process_incoming_request(&source, root);
done:
g_strfreev(basepath);
g_strfreev(path);
g_free(session_path);
g_free(handle_path);
return ret;
}
janus_request_source *janus_request_source_new(int type, void *source, void *msg) {
janus_request_source *req_source = (janus_request_source *)calloc(1, sizeof(janus_request_source));
req_source->type = type;
req_source->source = source;
req_source->msg = msg;
return req_source;
}
void janus_request_source_destroy(janus_request_source *req_source) {
if(req_source == NULL)
return;
req_source->source = NULL;
req_source->msg = NULL;
g_free(req_source);
}
int janus_process_incoming_request(janus_request_source *source, json_t *root) {
int ret = MHD_NO;
if(source == NULL || root == NULL) {
JANUS_LOG(LOG_ERR, "Missing source or payload to process, giving up...\n");
return ret;
}
/* 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 */
json_t *transaction = json_object_get(root, "transaction");
if(!transaction) {
ret = janus_process_error(source, session_id, NULL, JANUS_ERROR_MISSING_MANDATORY_ELEMENT, "Missing mandatory element (transaction)");
goto jsondone;
}
if(!json_is_string(transaction)) {
ret = janus_process_error(source, session_id, NULL, JANUS_ERROR_INVALID_ELEMENT_TYPE, "Invalid element type (transaction should be a string)");
goto jsondone;
}
const gchar *transaction_text = json_string_value(transaction);
json_t *message = json_object_get(root, "janus");
if(!message) {
ret = janus_process_error(source, session_id, transaction_text, JANUS_ERROR_MISSING_MANDATORY_ELEMENT, "Missing mandatory element (janus)");
goto jsondone;
}
if(!json_is_string(message)) {
ret = janus_process_error(source, session_id, transaction_text, JANUS_ERROR_INVALID_ELEMENT_TYPE, "Invalid element type (janus should be a string)");
goto jsondone;
}
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(source, "application/json", 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));
char *reply_text = json_dumps(reply, JSON_INDENT(3) | JSON_PRESERVE_ORDER);
json_decref(reply);
ret = janus_process_success(source, "application/json", g_strdup(reply_text));
goto jsondone;
}
if(strcasecmp(message_text, "create")) {
ret = janus_process_error(source, session_id, transaction_text, JANUS_ERROR_INVALID_REQUEST_PATH, "Unhandled request '%s' at this path", message_text);
goto jsondone;
}
if(ws_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), ws_api_secret)) {
ret = janus_process_error(source, 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 */
if(!json_is_integer(id) || json_integer_value(id) < 0) {
ret = janus_process_error(source, session_id, transaction_text, JANUS_ERROR_INVALID_ELEMENT_TYPE, "Invalid element type (id should be a positive integer)");
goto jsondone;
}
session_id = json_integer_value(id);
if(session_id > 0 && janus_session_find(session_id) != NULL) {
/* Session ID already taken */
ret = janus_process_error(source, 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(source, session_id, transaction_text, JANUS_ERROR_UNKNOWN, "Memory error");
goto jsondone;
}
session_id = session->session_id;
/* Take note of the source that originated this session (HTTP, WebSockets, RabbitMQ?) */
session->source = janus_request_source_new(source->type, source->source, NULL);
#ifdef HAVE_WEBSOCKETS
if(source->type == JANUS_SOURCE_WEBSOCKETS) {
/* Add the new session to the list of sessions created by this WS client */
janus_websocket_client *client = (janus_websocket_client *)source->source;
if(client) {
janus_mutex_lock(&client->mutex);
if(client->sessions == NULL)
client->sessions = g_hash_table_new(NULL, NULL);
g_hash_table_insert(client->sessions, GUINT_TO_POINTER(session_id), session);
janus_mutex_unlock(&client->mutex);
}
}
#endif
#ifdef HAVE_RABBITMQ
if(source->type == JANUS_SOURCE_RABBITMQ) {
/* Add the new session to the list of sessions created by this WS client */
janus_rabbitmq_client *client = (janus_rabbitmq_client *)source->source;
if(client) {
janus_mutex_lock(&client->mutex);
if(client->sessions == NULL)
client->sessions = g_hash_table_new(NULL, NULL);
g_hash_table_insert(client->sessions, GUINT_TO_POINTER(session_id), session);
janus_mutex_unlock(&client->mutex);
}
}
#endif
/* 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);
/* Convert to a string */
char *reply_text = json_dumps(reply, JSON_INDENT(3) | JSON_PRESERVE_ORDER);
json_decref(reply);
/* Send the success reply */
ret = janus_process_success(source, "application/json", reply_text);