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janus_http.c
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janus_http.c
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/*! \file janus_http.c
* \author Lorenzo Miniero <[email protected]>
* \copyright GNU General Public License v3
* \brief Janus RESTs transport plugin
* \details This is an implementation of a RESTs transport for the
* Janus API, using the libmicrohttpd library (http://www.gnu.org/software/libmicrohttpd/).
* This module allows browsers to make use of HTTP to talk to the Janus core.
* Since a Janus instance may be deployed on a different domain than the web
* server hosting the web applications using it, the plugin automatically
* handles OPTIONS request to comply with the CORS specification.
* POST requests can be used to ask for the management of a session with
* the server, to attach to a plugin, to send messages to the plugin
* itself and so on. GET requests instead are used for getting events
* associated to a Janus session (and as such to all its plugin handles
* and the events plugins push in the session itself), using a long poll
* approach. A JavaScript library (janus.js) implements all of this on
* the client side automatically.
* \note There's a well known bug in libmicrohttpd that may cause it to
* spike to 100% of the CPU when using HTTPS on some distributions. In
* case you're interested in HTTPS support, it's better to just rely on
* HTTP in Janus, and put a frontend like Apache HTTPD or nginx to take
* care of securing the traffic. More details are available in \ref deploy.
*
* \ingroup transports
* \ref transports
*/
#include "transport.h"
#include <arpa/inet.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <microhttpd.h>
#ifdef HAVE_ENUM_MHD_RESULT
/* enum MHD_Result introduced in libmicrohttpd v0.9.71 */
typedef enum MHD_Result MHD_Result;
#else
typedef int MHD_Result;
#endif
#include "../debug.h"
#include "../apierror.h"
#include "../config.h"
#include "../mutex.h"
#include "../ip-utils.h"
#include "../utils.h"
/* Transport plugin information */
#define JANUS_HTTP_VERSION 2
#define JANUS_HTTP_VERSION_STRING "0.0.2"
#define JANUS_HTTP_DESCRIPTION "This transport plugin adds REST (HTTP/HTTPS) support to the Janus API via libmicrohttpd."
#define JANUS_HTTP_NAME "JANUS REST (HTTP/HTTPS) transport plugin"
#define JANUS_HTTP_AUTHOR "Meetecho s.r.l."
#define JANUS_HTTP_PACKAGE "janus.transport.http"
/* Transport methods */
janus_transport *create(void);
int janus_http_init(janus_transport_callbacks *callback, const char *config_path);
void janus_http_destroy(void);
int janus_http_get_api_compatibility(void);
int janus_http_get_version(void);
const char *janus_http_get_version_string(void);
const char *janus_http_get_description(void);
const char *janus_http_get_name(void);
const char *janus_http_get_author(void);
const char *janus_http_get_package(void);
gboolean janus_http_is_janus_api_enabled(void);
gboolean janus_http_is_admin_api_enabled(void);
int janus_http_send_message(janus_transport_session *transport, void *request_id, gboolean admin, json_t *message);
void janus_http_session_created(janus_transport_session *transport, guint64 session_id);
void janus_http_session_over(janus_transport_session *transport, guint64 session_id, gboolean timeout, gboolean claimed);
void janus_http_session_claimed(janus_transport_session *transport, guint64 session_id);
json_t *janus_http_query_transport(json_t *request);
/* Transport setup */
static janus_transport janus_http_transport =
JANUS_TRANSPORT_INIT (
.init = janus_http_init,
.destroy = janus_http_destroy,
.get_api_compatibility = janus_http_get_api_compatibility,
.get_version = janus_http_get_version,
.get_version_string = janus_http_get_version_string,
.get_description = janus_http_get_description,
.get_name = janus_http_get_name,
.get_author = janus_http_get_author,
.get_package = janus_http_get_package,
.is_janus_api_enabled = janus_http_is_janus_api_enabled,
.is_admin_api_enabled = janus_http_is_admin_api_enabled,
.send_message = janus_http_send_message,
.session_created = janus_http_session_created,
.session_over = janus_http_session_over,
.session_claimed = janus_http_session_claimed,
.query_transport = janus_http_query_transport,
);
/* Transport creator */
janus_transport *create(void) {
JANUS_LOG(LOG_VERB, "%s created!\n", JANUS_HTTP_NAME);
return &janus_http_transport;
}
/* MHD uses this value as default */
#define DEFAULT_CONNECTION_LIMIT (FD_SETSIZE-4)
static unsigned int connection_limit = DEFAULT_CONNECTION_LIMIT;
/* Useful stuff */
static gint initialized = 0, stopping = 0;
static janus_transport_callbacks *gateway = NULL;
static gboolean http_janus_api_enabled = FALSE;
static gboolean http_admin_api_enabled = FALSE;
static gboolean notify_events = TRUE;
static enum MHD_FLAG mhd_debug_flag = MHD_NO_FLAG;
/* JSON serialization options */
static size_t json_format = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
/* Parameter validation (for tweaking and queries via Admin API) */
static struct janus_json_parameter request_parameters[] = {
{"request", JSON_STRING, JANUS_JSON_PARAM_REQUIRED}
};
static struct janus_json_parameter configure_parameters[] = {
{"events", JANUS_JSON_BOOL, 0},
{"json", JSON_STRING, 0},
};
/* Error codes (for the tweaking and queries via Admin API) */
#define JANUS_HTTP_ERROR_INVALID_REQUEST 411
#define JANUS_HTTP_ERROR_MISSING_ELEMENT 412
#define JANUS_HTTP_ERROR_INVALID_ELEMENT 413
#define JANUS_HTTP_ERROR_UNKNOWN_ERROR 499
/* Incoming HTTP message */
typedef struct janus_http_msg {
struct MHD_Connection *connection; /* The MHD connection this message came from */
volatile int suspended; /* Whether this connection is currently suspended */
volatile void *longpoll; /* Whether this is a long poll connection for a session */
int max_events; /* In case this is a long poll, how many events we should send back */
char *acro; /* Value of the Origin HTTP header, if any (needed for CORS) */
char *acrh; /* Value of the Access-Control-Request-Headers HTTP header, if any (needed for CORS) */
char *acrm; /* Value of the Access-Control-Request-Method HTTP header, if any (needed for CORS) */
char *contenttype; /* Content-Type of the payload */
char *payload; /* Payload of the message */
size_t len; /* Length of the message in octets */
gint64 session_id; /* Janus-Client session identifier this message belongs to */
char *response; /* The response from the core as a string */
size_t resplen; /* Length of the response in octets */
GSource *timeout; /* Timeout monitor, if any */
volatile gint timeout_flag; /* Whether a timeout hasn't fired yet */
volatile gint destroyed; /* Whether this session has been destroyed */
janus_refcount ref; /* Reference counter for this message */
} janus_http_msg;
static GHashTable *messages = NULL;
static janus_mutex messages_mutex = JANUS_MUTEX_INITIALIZER;
static void janus_http_msg_free(const janus_refcount *msg_ref) {
janus_http_msg *request = janus_refcount_containerof(msg_ref, janus_http_msg, ref);
/* This message can be destroyed, free all the resources */
if(!request)
return;
g_free(request->payload);
g_free(request->contenttype);
g_free(request->acro);
g_free(request->acrh);
g_free(request->acrm);
g_free(request->response);
g_free(request);
}
static void janus_http_msg_destroy(void *msg) {
janus_http_msg *request = (janus_http_msg *)msg;
if(request && g_atomic_int_compare_and_exchange(&request->destroyed, 0, 1))
janus_refcount_decrease(&request->ref);
}
/* Helper for long poll: HTTP events to push per session */
typedef struct janus_http_session {
guint64 session_id; /* Core session identifier */
GAsyncQueue *events; /* Events to notify for this session */
GList *longpolls; /* Long poll connection */
janus_mutex mutex; /* Mutex to lock this instance */
volatile gint destroyed; /* Whether this session has been destroyed */
janus_refcount ref; /* Reference counter for this session */
} janus_http_session;
/* We keep track of created sessions as we handle long polls */
static const char *keepalive_id = "keepalive";
static GHashTable *sessions = NULL;
static janus_mutex sessions_mutex = JANUS_MUTEX_INITIALIZER;
static void janus_http_session_destroy(janus_http_session *session) {
if(session && g_atomic_int_compare_and_exchange(&session->destroyed, 0, 1))
janus_refcount_decrease(&session->ref);
}
static void janus_http_session_free(const janus_refcount *session_ref) {
janus_http_session *session = janus_refcount_containerof(session_ref, janus_http_session, ref);
/* This session can be destroyed, free all the resources */
if(session->events) {
json_t *event = NULL;
while((event = g_async_queue_try_pop(session->events)) != NULL)
json_decref(event);
g_async_queue_unref(session->events);
}
g_free(session);
}
/* Custom GSource for tracking request timeouts (including long polls) */
typedef struct janus_http_request_timeout {
GSource source;
janus_transport_session *ts;
janus_http_session *session;
} janus_http_request_timeout;
/* Helper to handle timeouts */
static void janus_http_timeout(janus_transport_session *ts, janus_http_session *session, gboolean lock_session);
/* GSource Functions */
static gboolean janus_http_request_timeout_dispatch(GSource *source, GSourceFunc callback, gpointer user_data) {
JANUS_LOG(LOG_DBG, "[%p] dispatch\n", source);
janus_http_request_timeout *t = (janus_http_request_timeout *)source;
/* Timeout fired, invoke the function */
janus_http_timeout(t->ts, t->session, TRUE);
/* We're done */
g_source_destroy(source);
g_source_unref(source);
return G_SOURCE_REMOVE;
}
static void janus_http_request_timeout_finalize(GSource *source) {
JANUS_LOG(LOG_DBG, "[%p] finalize\n", source);
janus_http_request_timeout *timeout = (janus_http_request_timeout *)source;
if(timeout) {
if(timeout->session)
janus_refcount_decrease(&timeout->session->ref);
if(timeout->ts)
janus_refcount_decrease(&timeout->ts->ref);
}
}
static GSourceFuncs janus_http_request_timeout_funcs = {
NULL, NULL,
janus_http_request_timeout_dispatch,
janus_http_request_timeout_finalize,
NULL, NULL
};
static GSource *janus_http_request_timeout_create(janus_transport_session *ts, janus_http_session *session, gint timeout) {
GSource *source = g_source_new(&janus_http_request_timeout_funcs, sizeof(janus_http_request_timeout));
janus_http_request_timeout *t = (janus_http_request_timeout *)source;
t->ts = ts;
t->session = session;
g_source_set_ready_time(source, janus_get_monotonic_time() + timeout*G_USEC_PER_SEC);
JANUS_LOG(LOG_DBG, "[%p] create (%d)\n", source, timeout);
return source;
}
/* Callback (libmicrohttpd) invoked when a new connection is attempted on the REST API */
static MHD_Result janus_http_client_connect(void *cls, const struct sockaddr *addr, socklen_t addrlen);
/* Callback (libmicrohttpd) invoked when a new connection is attempted on the admin/monitor webserver */
static MHD_Result janus_http_admin_client_connect(void *cls, const struct sockaddr *addr, socklen_t addrlen);
/* Callback (libmicrohttpd) invoked when an HTTP message (GET, POST, OPTIONS, etc.) is available */
static MHD_Result janus_http_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);
/* Callback (libmicrohttpd) invoked when an admin/monitor HTTP message (GET, POST, OPTIONS, etc.) is available */
static MHD_Result janus_http_admin_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);
/* Callback (libmicrohttpd) invoked when headers of an incoming HTTP message have been parsed */
static MHD_Result janus_http_headers(void *cls, enum MHD_ValueKind kind, const char *key, const char *value);
/* Callback (libmicrohttpd) invoked when a request has been processed and can be freed */
static void janus_http_request_completed(void *cls, struct MHD_Connection *connection,
void **con_cls, enum MHD_RequestTerminationCode toe);
/* Callback to send data back after resuming a connection */
static ssize_t janus_http_response_callback(void *cls, uint64_t pos, char *buf, size_t max);
/* Worker to handle requests that are actually long polls */
static int janus_http_notifier(janus_http_msg *msg);
/* Helper to quickly send a success response */
static MHD_Result janus_http_return_success(janus_transport_session *ts, char *payload);
/* Helper to quickly send an error response */
static MHD_Result janus_http_return_error(janus_transport_session *ts, uint64_t session_id,
const char *transaction, gint error, const char *format, ...) G_GNUC_PRINTF(5, 6);
/* MHD Web Server */
static struct MHD_Daemon *ws = NULL, *sws = NULL;
static char *ws_path = NULL;
static char *cert_pem_bytes = NULL, *cert_key_bytes = NULL;
/* Admin/Monitor MHD Web Server */
static struct MHD_Daemon *admin_ws = NULL, *admin_sws = NULL;
static char *admin_ws_path = NULL;
/* Custom Access-Control-Allow-Origin value, if specified */
static char *allow_origin = NULL;
static gboolean enforce_cors = FALSE;
/* REST and Admin/Monitor ACL list */
static GList *janus_http_access_list = NULL, *janus_http_admin_access_list = NULL;
static janus_mutex access_list_mutex;
static void janus_http_allow_address(const char *ip, gboolean admin) {
if(ip == NULL)
return;
/* Is this an IP or an interface? */
janus_mutex_lock(&access_list_mutex);
if(!admin)
janus_http_access_list = g_list_append(janus_http_access_list, (gpointer)ip);
else
janus_http_admin_access_list = g_list_append(janus_http_admin_access_list, (gpointer)ip);
janus_mutex_unlock(&access_list_mutex);
}
static gboolean janus_http_is_allowed(const char *ip, gboolean admin) {
if(ip == NULL)
return FALSE;
if(!admin && janus_http_access_list == NULL)
return TRUE;
if(admin && janus_http_admin_access_list == NULL)
return TRUE;
janus_mutex_lock(&access_list_mutex);
GList *temp = admin ? janus_http_admin_access_list : janus_http_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;
}
/* Helper method to get the port from a struct sockaddr */
static uint16_t janus_http_sockaddr_to_port(struct sockaddr *address) {
if(address == NULL)
return 0;
struct sockaddr_in *sin = NULL;
struct sockaddr_in6 *sin6 = NULL;
switch(address->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *)address;
return ntohs(sin->sin_port);
case AF_INET6:
sin6 = (struct sockaddr_in6 *)address;
return ntohs(sin6->sin6_port);
default:
/* Unknown family */
break;
}
return 0;
}
/* Random string helper (for transactions) */
static char charset[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static void janus_http_random_string(int length, char *buffer) {
if(length > 0 && buffer) {
int l = (int)(sizeof(charset)-1);
int i=0;
for(i=0; i<length; i++) {
int key = janus_random_uint32() % l;
buffer[i] = charset[key];
}
buffer[length-1] = '\0';
}
}
/* Event loop for timeout monitoring purposes */
static GThread *httptimer = NULL;
static GMainLoop *httploop = NULL;
static GMainContext *httpctx = NULL;
static gpointer janus_http_timer(gpointer user_data) {
JANUS_LOG(LOG_INFO, "HTTP transport timer started\n");
g_main_loop_run(httploop);
return NULL;
}
/* Helper to create a MHD daemon */
static struct MHD_Daemon *janus_http_create_daemon(gboolean admin, char *path,
const char *interface, const char *ip, int port,
const char *server_pem, const char *server_key, const char *password, const char *ciphers) {
struct MHD_Daemon *daemon = NULL;
gboolean secure = server_pem && server_key;
/* Any interface or IP address we need to limit ourselves to?
* NOTE WELL: specifying an interface does NOT bind to all IPs associated
* with that interface, but only to the first one that's detected */
static struct sockaddr_in addr = { 0 };
struct sockaddr_in6 addr6 = { 0 };
gboolean ipv6 = FALSE;
if(ip && strstr(ip, ":"))
ipv6 = TRUE;
gboolean found = FALSE;
if(ip) {
/* Do a quick check to see if we need to bind on all addresses of a specific family */
if(!strcasecmp(ip, "0.0.0.0")) {
/* Bind on all IPv4 addresses */
found = TRUE;
memset(&addr, 0, sizeof (struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
} else if(!strcasecmp(ip, "::")) {
/* Bind on all IPv6 addresses */
found = TRUE;
memset(&addr6, 0, sizeof (struct sockaddr_in6));
addr6.sin6_family = AF_INET6;
addr6.sin6_port = htons(port);
addr6.sin6_addr = in6addr_any;
}
}
if(!found && (ip || interface)) {
struct ifaddrs *ifaddr = NULL, *ifa = NULL;
int family = 0, s = 0, n = 0;
char host[NI_MAXHOST];
if(getifaddrs(&ifaddr) == -1) {
JANUS_LOG(LOG_ERR, "Error getting list of interfaces to bind %s API %s webserver...\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
return NULL;
} else {
for(ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if(ifa->ifa_addr == NULL)
continue;
family = ifa->ifa_addr->sa_family;
if(interface && strcasecmp(ifa->ifa_name, interface))
continue;
if(ifa->ifa_addr == NULL)
continue;
/* Skip interfaces which are not up and running */
if(!((ifa->ifa_flags & IFF_UP) && (ifa->ifa_flags & IFF_RUNNING)))
continue;
/* FIXME When being explicit about the interface only, we only bind IPv4 for now:
* specifying or adding a precise IPv6 address gets you an IPv6 binding instead */
if(!ipv6 && family == AF_INET) {
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if(s != 0) {
JANUS_LOG(LOG_ERR, "Error doing a getnameinfo() to bind %s API %s webserver to '%s'...\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP", ip ? ip : interface);
return NULL;
}
if(ip && strcmp(host, ip))
continue;
found = TRUE;
break;
} else if(ipv6 && family == AF_INET6) {
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if(s != 0) {
JANUS_LOG(LOG_ERR, "Error doing a getnameinfo() to bind %s API %s webserver to '%s'...\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP", ip ? ip : interface);
return NULL;
}
if(ip && strcmp(host, ip))
continue;
found = TRUE;
break;
}
}
freeifaddrs(ifaddr);
}
if(!found) {
JANUS_LOG(LOG_ERR, "Error binding to %s '%s' for %s API %s webserver...\n",
ip ? "IP" : "interface", ip ? ip : interface,
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
return NULL;
}
JANUS_LOG(LOG_VERB, "Going to bind the %s API %s webserver to %s (asked for %s)\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP", host, ip ? ip : interface);
if(!ipv6) {
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
int res = inet_pton(AF_INET, host, &addr.sin_addr);
if(res != 1) {
JANUS_LOG(LOG_ERR, "Failed to convert address '%s' (%d)\n", host, res);
return NULL;
}
} else {
memset(&addr6, 0, sizeof(struct sockaddr_in6));
addr6.sin6_family = AF_INET6;
addr6.sin6_port = htons(port);
int res = inet_pton(AF_INET6, host, &addr6.sin6_addr);
if(res != 1) {
JANUS_LOG(LOG_ERR, "Failed to convert address '%s' (%d)\n", host, res);
return NULL;
}
}
}
if(!secure) {
/* HTTP web server */
if(!interface && !ip) {
/* Bind to all interfaces */
JANUS_LOG(LOG_VERB, "Binding to all interfaces for the %s API %s webserver\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
daemon = MHD_start_daemon(
MHD_USE_AUTO_INTERNAL_THREAD | MHD_USE_AUTO | MHD_USE_SUSPEND_RESUME | MHD_USE_DUAL_STACK | mhd_debug_flag,
port,
admin ? &janus_http_admin_client_connect : &janus_http_client_connect,
NULL,
admin ? &janus_http_admin_handler : &janus_http_handler,
path,
MHD_OPTION_NOTIFY_COMPLETED, &janus_http_request_completed, NULL,
MHD_OPTION_CONNECTION_TIMEOUT, 120,
MHD_OPTION_CONNECTION_LIMIT, connection_limit,
MHD_OPTION_END);
} else {
/* Bind to the interface that was specified */
JANUS_LOG(LOG_VERB, "Binding to %s '%s' for the %s API %s webserver\n",
ip ? "IP" : "interface", ip ? ip : interface,
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
daemon = MHD_start_daemon(
MHD_USE_AUTO_INTERNAL_THREAD | MHD_USE_AUTO | MHD_USE_SUSPEND_RESUME | (ipv6 ? MHD_USE_IPv6 : 0) | mhd_debug_flag,
port,
admin ? &janus_http_admin_client_connect : &janus_http_client_connect,
NULL,
admin ? &janus_http_admin_handler : &janus_http_handler,
path,
MHD_OPTION_NOTIFY_COMPLETED, &janus_http_request_completed, NULL,
MHD_OPTION_SOCK_ADDR, ipv6 ? (struct sockaddr *)&addr6 : (struct sockaddr *)&addr,
MHD_OPTION_CONNECTION_TIMEOUT, 120,
MHD_OPTION_CONNECTION_LIMIT, connection_limit,
MHD_OPTION_END);
}
} else {
/* HTTPS web server, read certificate and key */
g_file_get_contents(server_pem, &cert_pem_bytes, NULL, NULL);
g_file_get_contents(server_key, &cert_key_bytes, NULL, NULL);
/* Start webserver */
if(!interface && !ip) {
/* Bind to all interfaces */
JANUS_LOG(LOG_VERB, "Binding to all interfaces for the %s API %s webserver\n",
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
daemon = MHD_start_daemon(
MHD_USE_SSL | MHD_USE_AUTO_INTERNAL_THREAD | MHD_USE_AUTO | MHD_USE_SUSPEND_RESUME | MHD_USE_DUAL_STACK | mhd_debug_flag,
port,
admin ? &janus_http_admin_client_connect : &janus_http_client_connect,
NULL,
admin ? &janus_http_admin_handler : &janus_http_handler,
path,
MHD_OPTION_NOTIFY_COMPLETED, &janus_http_request_completed, NULL,
MHD_OPTION_HTTPS_PRIORITIES, ciphers,
MHD_OPTION_HTTPS_MEM_CERT, cert_pem_bytes,
MHD_OPTION_HTTPS_MEM_KEY, cert_key_bytes,
MHD_OPTION_HTTPS_KEY_PASSWORD, password,
MHD_OPTION_CONNECTION_TIMEOUT, 120,
MHD_OPTION_CONNECTION_LIMIT, connection_limit,
MHD_OPTION_END);
} else {
/* Bind to the interface that was specified */
JANUS_LOG(LOG_VERB, "Binding to %s '%s' for the %s API %s webserver\n",
ip ? "IP" : "interface", ip ? ip : interface,
admin ? "Admin" : "Janus", secure ? "HTTPS" : "HTTP");
daemon = MHD_start_daemon(
MHD_USE_SSL | MHD_USE_AUTO_INTERNAL_THREAD | MHD_USE_AUTO | MHD_USE_SUSPEND_RESUME | (ipv6 ? MHD_USE_IPv6 : 0) | mhd_debug_flag,
port,
admin ? &janus_http_admin_client_connect : &janus_http_client_connect,
NULL,
admin ? &janus_http_admin_handler : &janus_http_handler,
path,
MHD_OPTION_NOTIFY_COMPLETED, &janus_http_request_completed, NULL,
MHD_OPTION_HTTPS_PRIORITIES, ciphers,
MHD_OPTION_HTTPS_MEM_CERT, cert_pem_bytes,
MHD_OPTION_HTTPS_MEM_KEY, cert_key_bytes,
MHD_OPTION_HTTPS_KEY_PASSWORD, password,
MHD_OPTION_SOCK_ADDR, ipv6 ? (struct sockaddr *)&addr6 : (struct sockaddr *)&addr,
MHD_OPTION_CONNECTION_TIMEOUT, 120,
MHD_OPTION_CONNECTION_LIMIT, connection_limit,
MHD_OPTION_END);
}
}
return daemon;
}
/* Static helper method to fill in the CORS headers */
static void janus_http_add_cors_headers(janus_http_msg *msg, struct MHD_Response *response) {
if(msg == NULL || g_atomic_int_get(&msg->destroyed) || response == NULL)
return;
janus_refcount_increase(&msg->ref);
MHD_add_response_header(response, "Access-Control-Allow-Origin", allow_origin ? allow_origin : "*");
if(allow_origin) {
/* We need these two headers as well, in case Access-Control-Allow-Origin is custom */
MHD_add_response_header(response, "Access-Control-Allow-Credentials", "true");
MHD_add_response_header(response, "Vary", "Origin");
}
MHD_add_response_header(response, "Access-Control-Max-Age", "86400");
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);
janus_refcount_decrease(&msg->ref);
}
/* Static callback that we register to */
static void janus_http_mhd_panic(void *cls, const char *file, unsigned int line, const char *reason) {
JANUS_LOG(LOG_WARN, "[%s]: Error in GNU libmicrohttpd %s:%u: %s\n",
JANUS_HTTP_PACKAGE, file, line, reason);
}
/* Transport implementation */
int janus_http_init(janus_transport_callbacks *callback, const char *config_path) {
if(g_atomic_int_get(&stopping)) {
/* Still stopping from before */
return -1;
}
if(callback == NULL || config_path == NULL) {
/* Invalid arguments */
return -1;
}
/* This is the callback we'll need to invoke to contact the Janus core */
gateway = callback;
/* Register a function to detect problems for which MHD would typically abort */
MHD_set_panic_func(&janus_http_mhd_panic, NULL);
/* Start the timer */
httpctx = g_main_context_new();
httploop = g_main_loop_new(httpctx, FALSE);
GError *error = NULL;
httptimer = g_thread_try_new("http timer", &janus_http_timer, NULL, &error);
if(error != NULL) {
JANUS_LOG(LOG_FATAL, "Got error %d (%s) trying to start HTTP timer...\n",
error->code, error->message ? error->message : "??");
g_error_free(error);
return -1;
}
/* Read configuration */
char filename[255];
g_snprintf(filename, 255, "%s/%s.jcfg", config_path, JANUS_HTTP_PACKAGE);
JANUS_LOG(LOG_VERB, "Configuration file: %s\n", filename);
janus_config *config = janus_config_parse(filename);
if(config == NULL) {
JANUS_LOG(LOG_WARN, "Couldn't find .jcfg configuration file (%s), trying .cfg\n", JANUS_HTTP_PACKAGE);
g_snprintf(filename, 255, "%s/%s.cfg", config_path, JANUS_HTTP_PACKAGE);
JANUS_LOG(LOG_VERB, "Configuration file: %s\n", filename);
config = janus_config_parse(filename);
}
if(config != NULL) {
janus_config_print(config);
janus_config_category *config_general = janus_config_get_create(config, NULL, janus_config_type_category, "general");
janus_config_category *config_admin = janus_config_get_create(config, NULL, janus_config_type_category, "admin");
janus_config_category *config_cors = janus_config_get_create(config, NULL, janus_config_type_category, "cors");
janus_config_category *config_certs = janus_config_get_create(config, NULL, janus_config_type_category, "certificates");
/* Handle configuration */
janus_config_item *item = janus_config_get(config, config_general, janus_config_type_item, "json");
if(item && item->value) {
/* Check how we need to format/serialize the JSON output */
if(!strcasecmp(item->value, "indented")) {
/* Default: indented, we use three spaces for that */
json_format = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
} else if(!strcasecmp(item->value, "plain")) {
/* Not indented and no new lines, but still readable */
json_format = JSON_INDENT(0) | JSON_PRESERVE_ORDER;
} else if(!strcasecmp(item->value, "compact")) {
/* Compact, so no spaces between separators */
json_format = JSON_COMPACT | JSON_PRESERVE_ORDER;
} else {
JANUS_LOG(LOG_WARN, "Unsupported JSON format option '%s', using default (indented)\n", item->value);
json_format = JSON_INDENT(3) | JSON_PRESERVE_ORDER;
}
}
/* Check if we need to send events to handlers */
janus_config_item *events = janus_config_get(config, config_general, janus_config_type_item, "events");
if(events != NULL && events->value != NULL)
notify_events = janus_is_true(events->value);
if(!notify_events && callback->events_is_enabled()) {
JANUS_LOG(LOG_WARN, "Notification of events to handlers disabled for %s\n", JANUS_HTTP_NAME);
}
/* Check the base paths */
item = janus_config_get(config, config_general, janus_config_type_item, "base_path");
if(item && item->value) {
if(item->value[0] != '/') {
JANUS_LOG(LOG_FATAL, "Invalid base path %s (it should start with a /, e.g., /janus\n", item->value);
return -1;
}
ws_path = g_strdup(item->value);
if(strnlen(ws_path, 1 + 1) > 1 && ws_path[strlen(ws_path)-1] == '/') {
/* Remove the trailing slash, it makes things harder when we parse requests later */
ws_path[strlen(ws_path)-1] = '\0';
}
} else {
ws_path = g_strdup("/janus");
}
/* Do the same for the admin/monitor interface */
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_base_path");
if(item && item->value) {
if(item->value[0] != '/') {
JANUS_LOG(LOG_FATAL, "Invalid admin/monitor base path %s (it should start with a /, e.g., /admin\n", item->value);
return -1;
}
admin_ws_path = g_strdup(item->value);
if(strnlen(admin_ws_path, 1 + 1) > 1 && admin_ws_path[strlen(admin_ws_path)-1] == '/') {
/* Remove the trailing slash, it makes things harder when we parse requests later */
admin_ws_path[strlen(admin_ws_path)-1] = '\0';
}
} else {
admin_ws_path = g_strdup("/admin");
}
/* Check the open connections limit for mhd */
item = janus_config_get(config, config_general, janus_config_type_item, "mhd_connection_limit");
if(item && item->value && janus_string_to_uint32(item->value, &connection_limit) < 0) {
JANUS_LOG(LOG_ERR, "Invalid mhd_connection_limit (%s), falling back to default\n", item->value);
connection_limit = DEFAULT_CONNECTION_LIMIT;
}
/* Should we set the debug flag in libmicrohttpd? */
item = janus_config_get(config, config_general, janus_config_type_item, "mhd_debug");
if(item && item->value && janus_is_true(item->value))
mhd_debug_flag = MHD_USE_DEBUG;
/* Any ACL for either the Janus or Admin API? */
item = janus_config_get(config, config_general, janus_config_type_item, "acl");
if(item && item->value) {
char **list = g_strsplit(item->value, ",", -1);
char *index = list[0];
if(index != NULL) {
int i=0;
while(index != NULL) {
if(strlen(index) > 0) {
JANUS_LOG(LOG_INFO, "Adding '%s' to the Janus API allowed list...\n", index);
janus_http_allow_address(g_strdup(index), FALSE);
}
i++;
index = list[i];
}
}
g_strfreev(list);
list = NULL;
}
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_acl");
if(item && item->value) {
char **list = g_strsplit(item->value, ",", -1);
char *index = list[0];
if(index != NULL) {
int i=0;
while(index != NULL) {
if(strlen(index) > 0) {
JANUS_LOG(LOG_INFO, "Adding '%s' to the Admin/monitor allowed list...\n", index);
janus_http_allow_address(g_strdup(index), TRUE);
}
i++;
index = list[i];
}
}
g_strfreev(list);
list = NULL;
}
/* Any custom value for the Access-Control-Allow-Origin header? */
item = janus_config_get(config, config_cors, janus_config_type_item, "allow_origin");
if(item && item->value) {
allow_origin = g_strdup(item->value);
JANUS_LOG(LOG_INFO, "Restricting Access-Control-Allow-Origin to '%s'\n", allow_origin);
}
if(allow_origin != NULL) {
item = janus_config_get(config, config_cors, janus_config_type_item, "enforce_cors");
if(item && item->value && janus_is_true(item->value)) {
enforce_cors = TRUE;
JANUS_LOG(LOG_INFO, "Going to enforce CORS by 403 errors\n");
}
}
/* Start with the Janus API web server now */
item = janus_config_get(config, config_general, janus_config_type_item, "http");
if(!item || !item->value || !janus_is_true(item->value)) {
JANUS_LOG(LOG_VERB, "HTTP webserver disabled\n");
} else {
uint16_t wsport = 8088;
item = janus_config_get(config, config_general, janus_config_type_item, "port");
if(item && item->value && janus_string_to_uint16(item->value, &wsport) < 0) {
JANUS_LOG(LOG_ERR, "Invalid port (%s), falling back to default\n", item->value);
wsport = 8088;
}
const char *interface = NULL;
item = janus_config_get(config, config_general, janus_config_type_item, "interface");
if(item && item->value)
interface = item->value;
const char *ip = NULL;
item = janus_config_get(config, config_general, janus_config_type_item, "ip");
if(item && item->value)
ip = item->value;
ws = janus_http_create_daemon(FALSE, ws_path, interface, ip, wsport,
NULL, NULL, NULL, NULL);
if(ws == NULL) {
JANUS_LOG(LOG_FATAL, "Couldn't start webserver on port %d...\n", wsport);
} else {
JANUS_LOG(LOG_INFO, "HTTP webserver started (port %d, %s path listener)...\n", wsport, ws_path);
}
}
/* Do we also have to provide an HTTPS one? */
char *server_pem = NULL;
item = janus_config_get(config, config_certs, janus_config_type_item, "cert_pem");
if(item && item->value)
server_pem = (char *)item->value;
char *server_key = NULL;
item = janus_config_get(config, config_certs, janus_config_type_item, "cert_key");
if(item && item->value)
server_key = (char *)item->value;
char *password = NULL;
item = janus_config_get(config, config_certs, janus_config_type_item, "cert_pwd");
if(item && item->value)
password = (char *)item->value;
const char *ciphers = "NORMAL";
item = janus_config_get(config, config_certs, janus_config_type_item, "ciphers");
if(item && item->value)
ciphers = item->value;
if(server_key)
JANUS_LOG(LOG_VERB, "Using certificates:\n\t%s\n\t%s\n", server_pem, server_key);
item = janus_config_get(config, config_general, janus_config_type_item, "https");
if(!item || !item->value || !janus_is_true(item->value)) {
JANUS_LOG(LOG_VERB, "HTTPS webserver disabled\n");
} else {
if(!server_key || !server_pem) {
JANUS_LOG(LOG_FATAL, "Missing certificate/key path\n");
} else {
uint16_t swsport = 8089;
item = janus_config_get(config, config_general, janus_config_type_item, "secure_port");
if(item && item->value && janus_string_to_uint16(item->value, &swsport) < 0) {
JANUS_LOG(LOG_ERR, "Invalid port (%s), falling back to default\n", item->value);
swsport = 8089;
}
const char *interface = NULL;
item = janus_config_get(config, config_general, janus_config_type_item, "secure_interface");
if(item && item->value)
interface = item->value;
const char *ip = NULL;
item = janus_config_get(config, config_general, janus_config_type_item, "secure_ip");
if(item && item->value)
ip = item->value;
sws = janus_http_create_daemon(FALSE, ws_path, interface, ip, swsport,
server_pem, server_key, password, ciphers);
if(sws == NULL) {
JANUS_LOG(LOG_FATAL, "Couldn't start secure webserver on port %d...\n", swsport);
} else {
JANUS_LOG(LOG_INFO, "HTTPS webserver started (port %d, %s path listener)...\n", swsport, ws_path);
}
}
}
/* Admin/monitor time: start web server, if enabled */
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_http");
if(!item || !item->value || !janus_is_true(item->value)) {
JANUS_LOG(LOG_VERB, "Admin/monitor HTTP webserver disabled\n");
} else {
uint16_t wsport = 7088;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_port");
if(item && item->value && janus_string_to_uint16(item->value, &wsport) < 0) {
JANUS_LOG(LOG_ERR, "Invalid port (%s), falling back to default\n", item->value);
wsport = 7088;
}
const char *interface = NULL;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_interface");
if(item && item->value)
interface = item->value;
const char *ip = NULL;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_ip");
if(item && item->value)
ip = item->value;
admin_ws = janus_http_create_daemon(TRUE, admin_ws_path, interface, ip, wsport,
NULL, NULL, NULL, NULL);
if(admin_ws == NULL) {
JANUS_LOG(LOG_FATAL, "Couldn't start admin/monitor webserver on port %d...\n", wsport);
} else {
JANUS_LOG(LOG_INFO, "Admin/monitor HTTP webserver started (port %d, %s path listener)...\n", wsport, admin_ws_path);
}
}
/* Do we also have to provide an HTTPS one? */
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_https");
if(!item || !item->value || !janus_is_true(item->value)) {
JANUS_LOG(LOG_VERB, "Admin/monitor HTTPS webserver disabled\n");
} else {
if(!server_key) {
JANUS_LOG(LOG_FATAL, "Missing certificate/key path\n");
} else {
uint16_t swsport = 7889;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_secure_port");
if(item && item->value && janus_string_to_uint16(item->value, &swsport) < 0) {
JANUS_LOG(LOG_ERR, "Invalid port (%s), falling back to default\n", item->value);
swsport = 7889;
}
const char *interface = NULL;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_secure_interface");
if(item && item->value)
interface = item->value;
const char *ip = NULL;
item = janus_config_get(config, config_admin, janus_config_type_item, "admin_secure_ip");
if(item && item->value)
ip = item->value;
admin_sws = janus_http_create_daemon(TRUE, admin_ws_path, interface, ip, swsport,
server_pem, server_key, password, ciphers);
if(admin_sws == NULL) {
JANUS_LOG(LOG_FATAL, "Couldn't start secure admin/monitor webserver on port %d...\n", swsport);
} else {
JANUS_LOG(LOG_INFO, "Admin/monitor HTTPS webserver started (port %d, %s path listener)...\n",
swsport, admin_ws_path);
}
}
}
}
janus_config_destroy(config);
config = NULL;
if(!ws && !sws && !admin_ws && !admin_sws) {
JANUS_LOG(LOG_WARN, "No HTTP/HTTPS server started, giving up...\n");
return -1; /* No point in keeping the plugin loaded */
}
http_janus_api_enabled = ws || sws;
http_admin_api_enabled = admin_ws || admin_sws;
messages = g_hash_table_new_full(NULL, NULL, NULL, (GDestroyNotify)janus_transport_session_destroy);
sessions = g_hash_table_new_full(g_int64_hash, g_int64_equal, (GDestroyNotify)g_free, (GDestroyNotify)janus_http_session_destroy);
/* Done */
g_atomic_int_set(&initialized, 1);
JANUS_LOG(LOG_INFO, "%s initialized!\n", JANUS_HTTP_NAME);
return 0;
}
void janus_http_destroy(void) {
if(!g_atomic_int_get(&initialized))
return;
g_atomic_int_set(&stopping, 1);
g_main_loop_quit(httploop);
g_thread_join(httptimer);
g_main_context_unref(httpctx);
/* Resume all pending connections, before stopping the webservers */
janus_mutex_lock(&messages_mutex);
GHashTableIter iter;
gpointer value;
g_hash_table_iter_init(&iter, messages);
while(g_hash_table_iter_next(&iter, NULL, &value)) {
janus_transport_session *transport = value;
janus_http_msg *msg = (janus_http_msg *)transport->transport_p;
if(msg != NULL && !g_atomic_int_get(&msg->destroyed)) {
MHD_resume_connection(msg->connection);
}
}
janus_mutex_unlock(&messages_mutex);
JANUS_LOG(LOG_INFO, "Stopping webserver(s)...\n");
if(ws)
MHD_stop_daemon(ws);
ws = NULL;
if(sws)
MHD_stop_daemon(sws);
sws = NULL;
if(admin_ws)
MHD_stop_daemon(admin_ws);
admin_ws = NULL;
if(admin_sws)
MHD_stop_daemon(admin_sws);
admin_sws = NULL;
g_free((gpointer)cert_pem_bytes);
cert_pem_bytes = NULL;
g_free((gpointer)cert_key_bytes);
cert_key_bytes = NULL;
g_free(allow_origin);
allow_origin = NULL;
janus_mutex_lock(&messages_mutex);
g_hash_table_destroy(messages);
messages = NULL;
janus_mutex_unlock(&messages_mutex);
janus_mutex_lock(&sessions_mutex);
g_hash_table_destroy(sessions);
sessions = NULL;
janus_mutex_unlock(&sessions_mutex);
g_atomic_int_set(&initialized, 0);
g_atomic_int_set(&stopping, 0);
JANUS_LOG(LOG_INFO, "%s destroyed!\n", JANUS_HTTP_NAME);
}
int janus_http_get_api_compatibility(void) {
/* Important! This is what your plugin MUST always return: don't lie here or bad things will happen */
return JANUS_TRANSPORT_API_VERSION;
}
int janus_http_get_version(void) {
return JANUS_HTTP_VERSION;
}
const char *janus_http_get_version_string(void) {
return JANUS_HTTP_VERSION_STRING;
}
const char *janus_http_get_description(void) {
return JANUS_HTTP_DESCRIPTION;
}