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/* $Id: turn_sock.c 4360 2013-02-21 11:26:35Z bennylp $ */
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <pjnath/turn_sock.h>
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#include <pj/activesock.h>
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#include <pj/assert.h>
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#include <pj/ioqueue.h>
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enum { MAX_BIND_RETRY = 100 };
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#define INIT 0x1FFFFFFF
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pj_turn_session *sess;
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pj_bool_t is_destroying;
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pj_grp_lock_t *grp_lock;
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pj_turn_alloc_param alloc_param;
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pj_turn_sock_cfg setting;
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pj_turn_tp_type conn_type;
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pj_activesock_t *active_sock;
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pj_ioqueue_op_key_t send_key;
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* Callback prototypes.
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static pj_status_t turn_on_send_pkt(pj_turn_session *sess,
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const pj_uint8_t *pkt,
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const pj_sockaddr_t *dst_addr,
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unsigned dst_addr_len);
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static void turn_on_channel_bound(pj_turn_session *sess,
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const pj_sockaddr_t *peer_addr,
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static void turn_on_rx_data(pj_turn_session *sess,
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const pj_sockaddr_t *peer_addr,
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static void turn_on_state(pj_turn_session *sess,
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pj_turn_state_t old_state,
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pj_turn_state_t new_state);
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static pj_bool_t on_data_read(pj_activesock_t *asock,
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pj_size_t *remainder);
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static pj_bool_t on_connect_complete(pj_activesock_t *asock,
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static void turn_sock_on_destroy(void *comp);
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static void destroy(pj_turn_sock *turn_sock);
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static void timer_cb(pj_timer_heap_t *th, pj_timer_entry *e);
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PJ_DEF(void) pj_turn_sock_cfg_default(pj_turn_sock_cfg *cfg)
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pj_bzero(cfg, sizeof(*cfg));
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cfg->max_pkt_size = PJ_TURN_MAX_PKT_LEN;
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cfg->qos_type = PJ_QOS_TYPE_BEST_EFFORT;
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cfg->qos_ignore_error = PJ_TRUE;
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PJ_DEF(pj_status_t) pj_turn_sock_create(pj_stun_config *cfg,
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pj_turn_tp_type conn_type,
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const pj_turn_sock_cb *cb,
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const pj_turn_sock_cfg *setting,
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pj_turn_sock **p_turn_sock)
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pj_turn_sock *turn_sock;
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pj_turn_session_cb sess_cb;
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pj_turn_sock_cfg default_setting;
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const char *name_tmpl;
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PJ_ASSERT_RETURN(cfg && p_turn_sock, PJ_EINVAL);
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PJ_ASSERT_RETURN(af==pj_AF_INET() || af==pj_AF_INET6(), PJ_EINVAL);
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PJ_ASSERT_RETURN(conn_type!=PJ_TURN_TP_TCP || PJ_HAS_TCP, PJ_EINVAL);
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pj_turn_sock_cfg_default(&default_setting);
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setting = &default_setting;
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name_tmpl = "udprel%p";
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name_tmpl = "tcprel%p";
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PJ_ASSERT_RETURN(!"Invalid TURN conn_type", PJ_EINVAL);
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name_tmpl = "tcprel%p";
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/* Create and init basic data structure */
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pool = pj_pool_create(cfg->pf, name_tmpl, PJNATH_POOL_LEN_TURN_SOCK,
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PJNATH_POOL_INC_TURN_SOCK, NULL);
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turn_sock = PJ_POOL_ZALLOC_T(pool, pj_turn_sock);
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turn_sock->pool = pool;
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turn_sock->obj_name = pool->obj_name;
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turn_sock->user_data = user_data;
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turn_sock->conn_type = conn_type;
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/* Copy STUN config (this contains ioqueue, timer heap, etc.) */
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pj_memcpy(&turn_sock->cfg, cfg, sizeof(*cfg));
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/* Copy setting (QoS parameters etc */
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pj_memcpy(&turn_sock->setting, setting, sizeof(*setting));
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pj_memcpy(&turn_sock->cb, cb, sizeof(*cb));
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if (setting && setting->grp_lock) {
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turn_sock->grp_lock = setting->grp_lock;
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status = pj_grp_lock_create(pool, NULL, &turn_sock->grp_lock);
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if (status != PJ_SUCCESS) {
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pj_pool_release(pool);
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pj_grp_lock_add_ref(turn_sock->grp_lock);
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pj_grp_lock_add_handler(turn_sock->grp_lock, pool, turn_sock,
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&turn_sock_on_destroy);
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pj_timer_entry_init(&turn_sock->timer, TIMER_NONE, turn_sock, &timer_cb);
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/* Init TURN session */
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pj_bzero(&sess_cb, sizeof(sess_cb));
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sess_cb.on_send_pkt = &turn_on_send_pkt;
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sess_cb.on_channel_bound = &turn_on_channel_bound;
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sess_cb.on_rx_data = &turn_on_rx_data;
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sess_cb.on_state = &turn_on_state;
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status = pj_turn_session_create(cfg, pool->obj_name, af, conn_type,
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turn_sock->grp_lock, &sess_cb, 0,
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turn_sock, &turn_sock->sess);
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if (status != PJ_SUCCESS) {
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/* Note: socket and ioqueue will be created later once the TURN server
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*p_turn_sock = turn_sock;
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static void turn_sock_on_destroy(void *comp)
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pj_turn_sock *turn_sock = (pj_turn_sock*) comp;
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if (turn_sock->pool) {
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pj_pool_t *pool = turn_sock->pool;
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PJ_LOG(4,(turn_sock->obj_name, "TURN socket destroyed"));
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turn_sock->pool = NULL;
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pj_pool_release(pool);
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static void destroy(pj_turn_sock *turn_sock)
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PJ_LOG(4,(turn_sock->obj_name, "TURN socket destroy request, ref_cnt=%d",
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pj_grp_lock_get_ref(turn_sock->grp_lock)));
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pj_grp_lock_acquire(turn_sock->grp_lock);
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if (turn_sock->is_destroying) {
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pj_grp_lock_release(turn_sock->grp_lock);
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turn_sock->is_destroying = PJ_TRUE;
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pj_turn_session_shutdown(turn_sock->sess);
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if (turn_sock->active_sock)
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pj_activesock_close(turn_sock->active_sock);
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pj_grp_lock_dec_ref(turn_sock->grp_lock);
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pj_grp_lock_release(turn_sock->grp_lock);
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PJ_DEF(void) pj_turn_sock_destroy(pj_turn_sock *turn_sock)
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pj_grp_lock_acquire(turn_sock->grp_lock);
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if (turn_sock->is_destroying) {
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pj_grp_lock_release(turn_sock->grp_lock);
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if (turn_sock->sess) {
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pj_turn_session_shutdown(turn_sock->sess);
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/* This will ultimately call our state callback, and when
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* session state is DESTROYING we will schedule a timer to
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pj_grp_lock_release(turn_sock->grp_lock);
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static void timer_cb(pj_timer_heap_t *th, pj_timer_entry *e)
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pj_turn_sock *turn_sock = (pj_turn_sock*)e->user_data;
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pj_assert(!"Invalid timer id");
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static void show_err(pj_turn_sock *turn_sock, const char *title,
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PJ_PERROR(4,(turn_sock->obj_name, status, title));
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/* On error, terminate session */
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static void sess_fail(pj_turn_sock *turn_sock, const char *title,
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show_err(turn_sock, title, status);
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if (turn_sock->sess) {
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pj_turn_session_destroy(turn_sock->sess, status);
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PJ_DEF(pj_status_t) pj_turn_sock_set_user_data( pj_turn_sock *turn_sock,
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PJ_ASSERT_RETURN(turn_sock, PJ_EINVAL);
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turn_sock->user_data = user_data;
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PJ_DEF(void*) pj_turn_sock_get_user_data(pj_turn_sock *turn_sock)
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PJ_ASSERT_RETURN(turn_sock, NULL);
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return turn_sock->user_data;
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PJ_DEF(pj_status_t) pj_turn_sock_get_info(pj_turn_sock *turn_sock,
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pj_turn_session_info *info)
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PJ_ASSERT_RETURN(turn_sock && info, PJ_EINVAL);
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if (turn_sock->sess) {
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return pj_turn_session_get_info(turn_sock->sess, info);
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pj_bzero(info, sizeof(*info));
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info->state = PJ_TURN_STATE_NULL;
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* Lock the TURN socket. Application may need to call this function to
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* synchronize access to other objects to avoid deadlock.
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PJ_DEF(pj_status_t) pj_turn_sock_lock(pj_turn_sock *turn_sock)
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return pj_grp_lock_acquire(turn_sock->grp_lock);
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* Unlock the TURN socket.
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PJ_DEF(pj_status_t) pj_turn_sock_unlock(pj_turn_sock *turn_sock)
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return pj_grp_lock_release(turn_sock->grp_lock);
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* Set STUN message logging for this TURN session.
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PJ_DEF(void) pj_turn_sock_set_log( pj_turn_sock *turn_sock,
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pj_turn_session_set_log(turn_sock->sess, flags);
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PJ_DEF(pj_status_t) pj_turn_sock_set_software_name( pj_turn_sock *turn_sock,
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return pj_turn_session_set_software_name(turn_sock->sess, sw);
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PJ_DEF(pj_status_t) pj_turn_sock_alloc(pj_turn_sock *turn_sock,
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const pj_str_t *domain,
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pj_dns_resolver *resolver,
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const pj_stun_auth_cred *cred,
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const pj_turn_alloc_param *param)
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PJ_ASSERT_RETURN(turn_sock && domain, PJ_EINVAL);
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PJ_ASSERT_RETURN(turn_sock->sess, PJ_EINVALIDOP);
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pj_grp_lock_acquire(turn_sock->grp_lock);
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/* Copy alloc param. We will call session_alloc() only after the
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* server address has been resolved.
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pj_turn_alloc_param_copy(turn_sock->pool, &turn_sock->alloc_param, param);
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pj_turn_alloc_param_default(&turn_sock->alloc_param);
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status = pj_turn_session_set_credential(turn_sock->sess, cred);
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if (status != PJ_SUCCESS) {
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sess_fail(turn_sock, "Error setting credential", status);
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pj_grp_lock_release(turn_sock->grp_lock);
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status = pj_turn_session_set_server(turn_sock->sess, domain, default_port,
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if (status != PJ_SUCCESS) {
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sess_fail(turn_sock, "Error setting TURN server", status);
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pj_grp_lock_release(turn_sock->grp_lock);
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/* Done for now. The next work will be done when session state moved
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pj_grp_lock_release(turn_sock->grp_lock);
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PJ_DEF(pj_status_t) pj_turn_sock_set_perm( pj_turn_sock *turn_sock,
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const pj_sockaddr addr[],
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if (turn_sock->sess == NULL)
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return PJ_EINVALIDOP;
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return pj_turn_session_set_perm(turn_sock->sess, addr_cnt, addr, options);
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PJ_DEF(pj_status_t) pj_turn_sock_sendto( pj_turn_sock *turn_sock,
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const pj_uint8_t *pkt,
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const pj_sockaddr_t *addr,
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PJ_ASSERT_RETURN(turn_sock && addr && addr_len, PJ_EINVAL);
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if (turn_sock->sess == NULL)
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return PJ_EINVALIDOP;
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return pj_turn_session_sendto(turn_sock->sess, pkt, pkt_len,
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* Bind a peer address to a channel number.
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PJ_DEF(pj_status_t) pj_turn_sock_bind_channel( pj_turn_sock *turn_sock,
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const pj_sockaddr_t *peer,
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PJ_ASSERT_RETURN(turn_sock && peer && addr_len, PJ_EINVAL);
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PJ_ASSERT_RETURN(turn_sock->sess != NULL, PJ_EINVALIDOP);
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return pj_turn_session_bind_channel(turn_sock->sess, peer, addr_len);
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* Notification when outgoing TCP socket has been connected.
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static pj_bool_t on_connect_complete(pj_activesock_t *asock,
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pj_turn_sock *turn_sock;
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turn_sock = (pj_turn_sock*) pj_activesock_get_user_data(asock);
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pj_grp_lock_acquire(turn_sock->grp_lock);
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/* TURN session may have already been destroyed here.
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* See ticket #1557 (http://trac.pjsip.org/repos/ticket/1557).
494
if (!turn_sock->sess) {
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sess_fail(turn_sock, "TURN session already destroyed", status);
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pj_grp_lock_release(turn_sock->grp_lock);
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if (status != PJ_SUCCESS) {
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sess_fail(turn_sock, "TCP connect() error", status);
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pj_grp_lock_release(turn_sock->grp_lock);
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if (turn_sock->conn_type != PJ_TURN_TP_UDP) {
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PJ_LOG(5,(turn_sock->obj_name, "TCP connected"));
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/* Kick start pending read operation */
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status = pj_activesock_start_read(asock, turn_sock->pool,
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turn_sock->setting.max_pkt_size, 0);
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pj_ioqueue_op_key_init(&turn_sock->send_key, sizeof(turn_sock->send_key));
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/* Send Allocate request */
518
status = pj_turn_session_alloc(turn_sock->sess, &turn_sock->alloc_param);
519
if (status != PJ_SUCCESS) {
520
sess_fail(turn_sock, "Error sending ALLOCATE", status);
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pj_grp_lock_release(turn_sock->grp_lock);
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pj_grp_lock_release(turn_sock->grp_lock);
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static pj_uint16_t GETVAL16H(const pj_uint8_t *buf, unsigned pos)
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return (pj_uint16_t) ((buf[pos + 0] << 8) | \
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(buf[pos + 1] << 0));
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/* Quick check to determine if there is enough packet to process in the
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* incoming buffer. Return the packet length, or zero if there's no packet.
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static unsigned has_packet(pj_turn_sock *turn_sock, const void *buf, pj_size_t bufsize)
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if (turn_sock->conn_type == PJ_TURN_TP_UDP)
545
/* Quickly check if this is STUN message, by checking the first two bits and
546
* size field which must be multiple of 4 bytes
548
is_stun = ((((pj_uint8_t*)buf)[0] & 0xC0) == 0) &&
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((GETVAL16H((const pj_uint8_t*)buf, 2) & 0x03)==0);
552
pj_size_t msg_len = GETVAL16H((const pj_uint8_t*)buf, 2);
553
return (msg_len+20 <= bufsize) ? msg_len+20 : 0;
555
/* This must be ChannelData. */
556
pj_turn_channel_data cd;
561
/* Decode ChannelData packet */
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pj_memcpy(&cd, buf, sizeof(pj_turn_channel_data));
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cd.length = pj_ntohs(cd.length);
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if (bufsize >= cd.length+sizeof(cd))
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return (cd.length+sizeof(cd)+3) & (~3);
573
* Notification from ioqueue when incoming UDP packet is received.
575
static pj_bool_t on_data_read(pj_activesock_t *asock,
579
pj_size_t *remainder)
581
pj_turn_sock *turn_sock;
582
pj_bool_t ret = PJ_TRUE;
584
turn_sock = (pj_turn_sock*) pj_activesock_get_user_data(asock);
585
pj_grp_lock_acquire(turn_sock->grp_lock);
587
if (status == PJ_SUCCESS && turn_sock->sess && !turn_sock->is_destroying) {
588
/* Report incoming packet to TURN session, repeat while we have
589
* "packet" in the buffer (required for stream-oriented transports)
593
//PJ_LOG(5,(turn_sock->pool->obj_name,
594
// "Incoming data, %lu bytes total buffer", size));
596
while ((pkt_len=has_packet(turn_sock, data, size)) != 0) {
597
pj_size_t parsed_len;
598
//const pj_uint8_t *pkt = (const pj_uint8_t*)data;
600
//PJ_LOG(5,(turn_sock->pool->obj_name,
601
// "Packet start: %02X %02X %02X %02X",
602
// pkt[0], pkt[1], pkt[2], pkt[3]));
604
//PJ_LOG(5,(turn_sock->pool->obj_name,
605
// "Processing %lu bytes packet of %lu bytes total buffer",
608
parsed_len = (unsigned)size;
609
pj_turn_session_on_rx_pkt(turn_sock->sess, data, size, &parsed_len);
611
/* parsed_len may be zero if we have parsing error, so use our
612
* previous calculation to exhaust the bad packet.
615
parsed_len = pkt_len;
617
if (parsed_len < (unsigned)size) {
618
*remainder = size - parsed_len;
619
pj_memmove(data, ((char*)data)+parsed_len, *remainder);
625
//PJ_LOG(5,(turn_sock->pool->obj_name,
626
// "Buffer size now %lu bytes", size));
628
} else if (status != PJ_SUCCESS &&
629
turn_sock->conn_type != PJ_TURN_TP_UDP)
631
sess_fail(turn_sock, "TCP connection closed", status);
637
pj_grp_lock_release(turn_sock->grp_lock);
644
* Callback from TURN session to send outgoing packet.
646
static pj_status_t turn_on_send_pkt(pj_turn_session *sess,
647
const pj_uint8_t *pkt,
649
const pj_sockaddr_t *dst_addr,
650
unsigned dst_addr_len)
652
pj_turn_sock *turn_sock = (pj_turn_sock*)
653
pj_turn_session_get_user_data(sess);
654
pj_ssize_t len = pkt_len;
657
if (turn_sock == NULL || turn_sock->is_destroying) {
658
/* We've been destroyed */
659
// https://trac.pjsip.org/repos/ticket/1316
660
//pj_assert(!"We should shutdown gracefully");
661
return PJ_EINVALIDOP;
664
PJ_UNUSED_ARG(dst_addr);
665
PJ_UNUSED_ARG(dst_addr_len);
667
status = pj_activesock_send(turn_sock->active_sock, &turn_sock->send_key,
669
if (status != PJ_SUCCESS && status != PJ_EPENDING) {
670
show_err(turn_sock, "socket send()", status);
678
* Callback from TURN session when a channel is successfully bound.
680
static void turn_on_channel_bound(pj_turn_session *sess,
681
const pj_sockaddr_t *peer_addr,
686
PJ_UNUSED_ARG(peer_addr);
687
PJ_UNUSED_ARG(addr_len);
688
PJ_UNUSED_ARG(ch_num);
693
* Callback from TURN session upon incoming data.
695
static void turn_on_rx_data(pj_turn_session *sess,
698
const pj_sockaddr_t *peer_addr,
701
pj_turn_sock *turn_sock = (pj_turn_sock*)
702
pj_turn_session_get_user_data(sess);
703
if (turn_sock == NULL || turn_sock->is_destroying) {
704
/* We've been destroyed */
708
if (turn_sock->cb.on_rx_data) {
709
(*turn_sock->cb.on_rx_data)(turn_sock, pkt, pkt_len,
710
peer_addr, addr_len);
716
* Callback from TURN session when state has changed
718
static void turn_on_state(pj_turn_session *sess,
719
pj_turn_state_t old_state,
720
pj_turn_state_t new_state)
722
pj_turn_sock *turn_sock = (pj_turn_sock*)
723
pj_turn_session_get_user_data(sess);
726
if (turn_sock == NULL) {
727
/* We've been destroyed */
731
/* Notify app first */
732
if (turn_sock->cb.on_state) {
733
(*turn_sock->cb.on_state)(turn_sock, old_state, new_state);
736
/* Make sure user hasn't destroyed us in the callback */
737
if (turn_sock->sess && new_state == PJ_TURN_STATE_RESOLVED) {
738
pj_turn_session_info info;
739
pj_turn_session_get_info(turn_sock->sess, &info);
740
new_state = info.state;
743
if (turn_sock->sess && new_state == PJ_TURN_STATE_RESOLVED) {
745
* Once server has been resolved, initiate outgoing TCP
746
* connection to the server.
748
pj_turn_session_info info;
749
char addrtxt[PJ_INET6_ADDRSTRLEN+8];
752
pj_activesock_cfg asock_cfg;
753
pj_activesock_cb asock_cb;
754
pj_sockaddr bound_addr, *cfg_bind_addr;
755
pj_uint16_t max_bind_retry;
757
/* Close existing connection, if any. This happens when
758
* we're switching to alternate TURN server when either TCP
759
* connection or ALLOCATE request failed.
761
if (turn_sock->active_sock) {
762
pj_activesock_close(turn_sock->active_sock);
763
turn_sock->active_sock = NULL;
766
/* Get server address from session info */
767
pj_turn_session_get_info(sess, &info);
769
if (turn_sock->conn_type == PJ_TURN_TP_UDP)
770
sock_type = pj_SOCK_DGRAM();
772
sock_type = pj_SOCK_STREAM();
775
status = pj_sock_socket(turn_sock->af, sock_type, 0, &sock);
776
if (status != PJ_SUCCESS) {
777
pj_turn_sock_destroy(turn_sock);
782
cfg_bind_addr = &turn_sock->setting.bound_addr;
783
max_bind_retry = MAX_BIND_RETRY;
784
if (turn_sock->setting.port_range &&
785
turn_sock->setting.port_range < max_bind_retry)
787
max_bind_retry = turn_sock->setting.port_range;
789
pj_sockaddr_init(turn_sock->af, &bound_addr, NULL, 0);
790
if (cfg_bind_addr->addr.sa_family == pj_AF_INET() ||
791
cfg_bind_addr->addr.sa_family == pj_AF_INET6())
793
pj_sockaddr_cp(&bound_addr, cfg_bind_addr);
795
status = pj_sock_bind_random(sock, &bound_addr,
796
turn_sock->setting.port_range,
798
if (status != PJ_SUCCESS) {
799
pj_turn_sock_destroy(turn_sock);
803
/* Apply QoS, if specified */
804
status = pj_sock_apply_qos2(sock, turn_sock->setting.qos_type,
805
&turn_sock->setting.qos_params,
806
(turn_sock->setting.qos_ignore_error?2:1),
807
turn_sock->pool->obj_name, NULL);
808
if (status != PJ_SUCCESS && !turn_sock->setting.qos_ignore_error) {
809
pj_turn_sock_destroy(turn_sock);
813
/* Create active socket */
814
pj_activesock_cfg_default(&asock_cfg);
815
asock_cfg.grp_lock = turn_sock->grp_lock;
817
pj_bzero(&asock_cb, sizeof(asock_cb));
818
asock_cb.on_data_read = &on_data_read;
819
asock_cb.on_connect_complete = &on_connect_complete;
820
status = pj_activesock_create(turn_sock->pool, sock,
821
sock_type, &asock_cfg,
822
turn_sock->cfg.ioqueue, &asock_cb,
824
&turn_sock->active_sock);
825
if (status != PJ_SUCCESS) {
826
pj_turn_sock_destroy(turn_sock);
830
PJ_LOG(5,(turn_sock->pool->obj_name,
832
pj_sockaddr_print(&info.server, addrtxt,
833
sizeof(addrtxt), 3)));
835
/* Initiate non-blocking connect */
837
status=pj_activesock_start_connect(turn_sock->active_sock,
840
pj_sockaddr_get_len(&info.server));
841
if (status == PJ_SUCCESS) {
842
on_connect_complete(turn_sock->active_sock, PJ_SUCCESS);
843
} else if (status != PJ_EPENDING) {
844
pj_turn_sock_destroy(turn_sock);
848
on_connect_complete(turn_sock->active_sock, PJ_SUCCESS);
851
/* Done for now. Subsequent work will be done in
852
* on_connect_complete() callback.
856
if (new_state >= PJ_TURN_STATE_DESTROYING && turn_sock->sess) {
857
pj_time_val delay = {0, 0};
859
turn_sock->sess = NULL;
860
pj_turn_session_set_user_data(sess, NULL);
862
pj_timer_heap_cancel_if_active(turn_sock->cfg.timer_heap,
863
&turn_sock->timer, 0);
864
pj_timer_heap_schedule_w_grp_lock(turn_sock->cfg.timer_heap,
866
&delay, TIMER_DESTROY,
867
turn_sock->grp_lock);