/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #define THIS_FILE "sip_ua_layer.c" /* * Static prototypes. */ static pj_status_t mod_ua_load(pjsip_endpoint *endpt); static pj_status_t mod_ua_unload(void); static pj_bool_t mod_ua_on_rx_request(pjsip_rx_data *rdata); static pj_bool_t mod_ua_on_rx_response(pjsip_rx_data *rdata); static void mod_ua_on_tsx_state(pjsip_transaction*, pjsip_event*); extern long pjsip_dlg_lock_tls_id; /* defined in sip_dialog.c */ /* This struct is used to represent list of dialog inside a dialog set. * We don't want to use pjsip_dialog for this purpose, to save some * memory (about 100 bytes per dialog set). */ struct dlg_set_head { PJ_DECL_LIST_MEMBER(pjsip_dialog); }; /* This struct represents a dialog set. * This is the value that will be put in the UA's hash table. */ struct dlg_set { /* To put this node in free dlg_set nodes in UA. */ PJ_DECL_LIST_MEMBER(struct dlg_set); /* This is the buffer to store this entry in the hash table. */ pj_hash_entry_buf ht_entry; /* List of dialog in this dialog set. */ struct dlg_set_head dlg_list; }; /* * Module interface. */ static struct user_agent { pjsip_module mod; pj_pool_t *pool; pjsip_endpoint *endpt; pj_mutex_t *mutex; pj_hash_table_t *dlg_table; pjsip_ua_init_param param; struct dlg_set free_dlgset_nodes; } mod_ua = { { NULL, NULL, /* prev, next. */ { "mod-ua", 6 }, /* Name. */ -1, /* Id */ PJSIP_MOD_PRIORITY_UA_PROXY_LAYER, /* Priority */ &mod_ua_load, /* load() */ NULL, /* start() */ NULL, /* stop() */ &mod_ua_unload, /* unload() */ &mod_ua_on_rx_request, /* on_rx_request() */ &mod_ua_on_rx_response, /* on_rx_response() */ NULL, /* on_tx_request. */ NULL, /* on_tx_response() */ &mod_ua_on_tsx_state, /* on_tsx_state() */ } }; /* * mod_ua_load() * * Called when module is being loaded by endpoint. */ static pj_status_t mod_ua_load(pjsip_endpoint *endpt) { pj_status_t status; /* Initialize the user agent. */ mod_ua.endpt = endpt; mod_ua.pool = pjsip_endpt_create_pool( endpt, "ua%p", PJSIP_POOL_LEN_UA, PJSIP_POOL_INC_UA); if (mod_ua.pool == NULL) return PJ_ENOMEM; status = pj_mutex_create_recursive(mod_ua.pool, " ua%p", &mod_ua.mutex); if (status != PJ_SUCCESS) return status; mod_ua.dlg_table = pj_hash_create(mod_ua.pool, PJSIP_MAX_DIALOG_COUNT); if (mod_ua.dlg_table == NULL) return PJ_ENOMEM; pj_list_init(&mod_ua.free_dlgset_nodes); /* Initialize dialog lock. */ status = pj_thread_local_alloc(&pjsip_dlg_lock_tls_id); if (status != PJ_SUCCESS) return status; pj_thread_local_set(pjsip_dlg_lock_tls_id, NULL); return PJ_SUCCESS; } /* * mod_ua_unload() * * Called when module is being unloaded. */ static pj_status_t mod_ua_unload(void) { pj_thread_local_free(pjsip_dlg_lock_tls_id); pj_mutex_destroy(mod_ua.mutex); /* Release pool */ if (mod_ua.pool) { pjsip_endpt_release_pool( mod_ua.endpt, mod_ua.pool ); } return PJ_SUCCESS; } /* * mod_ua_on_tsx_stats() * * Called on changed on transaction state. */ static void mod_ua_on_tsx_state( pjsip_transaction *tsx, pjsip_event *e) { pjsip_dialog *dlg; /* Get the dialog where this transaction belongs. */ dlg = (pjsip_dialog*) tsx->mod_data[mod_ua.mod.id]; /* If dialog instance has gone, it could mean that the dialog * may has been destroyed. */ if (dlg == NULL) return; /* Hand over the event to the dialog. */ pjsip_dlg_on_tsx_state(dlg, tsx, e); } /* * Init user agent module and register it to the endpoint. */ PJ_DEF(pj_status_t) pjsip_ua_init_module( pjsip_endpoint *endpt, const pjsip_ua_init_param *prm) { pj_status_t status; /* Check if module already registered. */ PJ_ASSERT_RETURN(mod_ua.mod.id == -1, PJ_EINVALIDOP); /* Copy param, if exists. */ if (prm) pj_memcpy(&mod_ua.param, prm, sizeof(pjsip_ua_init_param)); /* Register the module. */ status = pjsip_endpt_register_module(endpt, &mod_ua.mod); return status; } /* * Get the instance of the user agent. * */ PJ_DEF(pjsip_user_agent*) pjsip_ua_instance(void) { return &mod_ua.mod; } /* * Get the endpoint where this UA is currently registered. */ PJ_DEF(pjsip_endpoint*) pjsip_ua_get_endpt(pjsip_user_agent *ua) { PJ_UNUSED_ARG(ua); pj_assert(ua == &mod_ua.mod); return mod_ua.endpt; } /* * Destroy the user agent layer. */ PJ_DEF(pj_status_t) pjsip_ua_destroy(void) { /* Check if module already destroyed. */ PJ_ASSERT_RETURN(mod_ua.mod.id != -1, PJ_EINVALIDOP); return pjsip_endpt_unregister_module(mod_ua.endpt, &mod_ua.mod); } /* * Create key to identify dialog set. */ /* PJ_DEF(void) pjsip_ua_create_dlg_set_key( pj_pool_t *pool, pj_str_t *set_key, const pj_str_t *call_id, const pj_str_t *local_tag) { PJ_ASSERT_ON_FAIL(pool && set_key && call_id && local_tag, return;); set_key->slen = call_id->slen + local_tag->slen + 1; set_key->ptr = (char*) pj_pool_alloc(pool, set_key->slen); pj_assert(set_key->ptr != NULL); pj_memcpy(set_key->ptr, call_id->ptr, call_id->slen); set_key->ptr[call_id->slen] = '$'; pj_memcpy(set_key->ptr + call_id->slen + 1, local_tag->ptr, local_tag->slen); } */ /* * Acquire one dlg_set node to be put in the hash table. * This will first look in the free nodes list, then allocate * a new one from UA's pool when one is not available. */ static struct dlg_set *alloc_dlgset_node(void) { struct dlg_set *set; if (!pj_list_empty(&mod_ua.free_dlgset_nodes)) { set = mod_ua.free_dlgset_nodes.next; pj_list_erase(set); return set; } else { set = PJ_POOL_ALLOC_T(mod_ua.pool, struct dlg_set); return set; } } /* * Register new dialog. Called by pjsip_dlg_create_uac() and * pjsip_dlg_create_uas_and_inc_lock(); */ PJ_DEF(pj_status_t) pjsip_ua_register_dlg( pjsip_user_agent *ua, pjsip_dialog *dlg ) { /* Sanity check. */ PJ_ASSERT_RETURN(ua && dlg, PJ_EINVAL); /* For all dialogs, local tag (inc hash) must has been initialized. */ PJ_ASSERT_RETURN(dlg->local.info && dlg->local.info->tag.slen && dlg->local.tag_hval != 0, PJ_EBUG); /* For UAS dialog, remote tag (inc hash) must have been initialized. */ //PJ_ASSERT_RETURN(dlg->role==PJSIP_ROLE_UAC || // (dlg->role==PJSIP_ROLE_UAS && dlg->remote.info->tag.slen // && dlg->remote.tag_hval != 0), PJ_EBUG); /* Lock the user agent. */ pj_mutex_lock(mod_ua.mutex); /* For UAC, check if there is existing dialog in the same set. */ if (dlg->role == PJSIP_ROLE_UAC) { struct dlg_set *dlg_set; dlg_set = (struct dlg_set*) pj_hash_get_lower( mod_ua.dlg_table, dlg->local.info->tag.ptr, (unsigned)dlg->local.info->tag.slen, &dlg->local.tag_hval); if (dlg_set) { /* This is NOT the first dialog in the dialog set. * Just add this dialog in the list. */ pj_assert(dlg_set->dlg_list.next != (void*)&dlg_set->dlg_list); pj_list_push_back(&dlg_set->dlg_list, dlg); dlg->dlg_set = dlg_set; } else { /* This is the first dialog in the dialog set. * Create the dialog set and add this dialog to it. */ dlg_set = alloc_dlgset_node(); pj_list_init(&dlg_set->dlg_list); pj_list_push_back(&dlg_set->dlg_list, dlg); dlg->dlg_set = dlg_set; /* Register the dialog set in the hash table. */ pj_hash_set_np_lower(mod_ua.dlg_table, dlg->local.info->tag.ptr, (unsigned)dlg->local.info->tag.slen, dlg->local.tag_hval, dlg_set->ht_entry, dlg_set); } } else { /* For UAS, create the dialog set with a single dialog as member. */ struct dlg_set *dlg_set; dlg_set = alloc_dlgset_node(); pj_list_init(&dlg_set->dlg_list); pj_list_push_back(&dlg_set->dlg_list, dlg); dlg->dlg_set = dlg_set; pj_hash_set_np_lower(mod_ua.dlg_table, dlg->local.info->tag.ptr, (unsigned)dlg->local.info->tag.slen, dlg->local.tag_hval, dlg_set->ht_entry, dlg_set); } /* Unlock user agent. */ pj_mutex_unlock(mod_ua.mutex); /* Done. */ return PJ_SUCCESS; } PJ_DEF(pj_status_t) pjsip_ua_unregister_dlg( pjsip_user_agent *ua, pjsip_dialog *dlg ) { struct dlg_set *dlg_set; pjsip_dialog *d; /* Sanity-check arguments. */ PJ_ASSERT_RETURN(ua && dlg, PJ_EINVAL); /* Check that dialog has been registered. */ PJ_ASSERT_RETURN(dlg->dlg_set, PJ_EINVALIDOP); /* Lock user agent. */ pj_mutex_lock(mod_ua.mutex); /* Find this dialog from the dialog set. */ dlg_set = (struct dlg_set*) dlg->dlg_set; d = dlg_set->dlg_list.next; while (d != (pjsip_dialog*)&dlg_set->dlg_list && d != dlg) { d = d->next; } if (d != dlg) { pj_assert(!"Dialog is not registered!"); pj_mutex_unlock(mod_ua.mutex); return PJ_EINVALIDOP; } /* Remove this dialog from the list. */ pj_list_erase(dlg); /* If dialog list is empty, remove the dialog set from the hash table. */ if (pj_list_empty(&dlg_set->dlg_list)) { pj_hash_set_lower(NULL, mod_ua.dlg_table, dlg->local.info->tag.ptr, (unsigned)dlg->local.info->tag.slen, dlg->local.tag_hval, NULL); /* Return dlg_set to free nodes. */ pj_list_push_back(&mod_ua.free_dlgset_nodes, dlg_set); } /* Unlock user agent. */ pj_mutex_unlock(mod_ua.mutex); /* Done. */ return PJ_SUCCESS; } PJ_DEF(pjsip_dialog*) pjsip_rdata_get_dlg( pjsip_rx_data *rdata ) { return (pjsip_dialog*) rdata->endpt_info.mod_data[mod_ua.mod.id]; } PJ_DEF(pjsip_dialog*) pjsip_tdata_get_dlg( pjsip_tx_data *tdata ) { return (pjsip_dialog*) tdata->mod_data[mod_ua.mod.id]; } PJ_DEF(pjsip_dialog*) pjsip_tsx_get_dlg( pjsip_transaction *tsx ) { return (pjsip_dialog*) tsx->mod_data[mod_ua.mod.id]; } /* * Retrieve the current number of dialog-set currently registered * in the hash table. */ PJ_DEF(unsigned) pjsip_ua_get_dlg_set_count(void) { unsigned count; PJ_ASSERT_RETURN(mod_ua.endpt, 0); pj_mutex_lock(mod_ua.mutex); count = pj_hash_count(mod_ua.dlg_table); pj_mutex_unlock(mod_ua.mutex); return count; } /* * Find a dialog. */ PJ_DEF(pjsip_dialog*) pjsip_ua_find_dialog(const pj_str_t *call_id, const pj_str_t *local_tag, const pj_str_t *remote_tag, pj_bool_t lock_dialog) { struct dlg_set *dlg_set; pjsip_dialog *dlg; PJ_ASSERT_RETURN(call_id && local_tag && remote_tag, NULL); /* Lock user agent. */ pj_mutex_lock(mod_ua.mutex); /* Lookup the dialog set. */ dlg_set = (struct dlg_set*) pj_hash_get_lower(mod_ua.dlg_table, local_tag->ptr, (unsigned)local_tag->slen, NULL); if (dlg_set == NULL) { /* Not found */ pj_mutex_unlock(mod_ua.mutex); return NULL; } /* Dialog set is found, now find the matching dialog based on the * remote tag. */ dlg = dlg_set->dlg_list.next; while (dlg != (pjsip_dialog*)&dlg_set->dlg_list) { if (pj_stricmp(&dlg->remote.info->tag, remote_tag) == 0) break; dlg = dlg->next; } if (dlg == (pjsip_dialog*)&dlg_set->dlg_list) { /* Not found */ pj_mutex_unlock(mod_ua.mutex); return NULL; } /* Dialog has been found. It SHOULD have the right Call-ID!! */ if (pj_strcmp(&dlg->call_id->id, call_id)!=0) { PJ_LOG(6, (THIS_FILE, "Dialog not found: local and remote tags " "matched but not call id")); pj_mutex_unlock(mod_ua.mutex); return NULL; } if (lock_dialog) { if (pjsip_dlg_try_inc_lock(dlg) != PJ_SUCCESS) { /* * Unable to acquire dialog's lock while holding the user * agent's mutex. Release the UA mutex before retrying once * more. * * THIS MAY CAUSE RACE CONDITION! */ /* Unlock user agent. */ pj_mutex_unlock(mod_ua.mutex); /* Lock dialog */ pjsip_dlg_inc_lock(dlg); } else { /* Unlock user agent. */ pj_mutex_unlock(mod_ua.mutex); } } else { /* Unlock user agent. */ pj_mutex_unlock(mod_ua.mutex); } return dlg; } /* * Find the first dialog in dialog set in hash table for an incoming message. */ static struct dlg_set *find_dlg_set_for_msg( pjsip_rx_data *rdata ) { /* CANCEL message doesn't have To tag, so we must lookup the dialog * by finding the INVITE UAS transaction being cancelled. */ if (rdata->msg_info.cseq->method.id == PJSIP_CANCEL_METHOD) { pjsip_dialog *dlg; /* Create key for the rdata, but this time, use INVITE as the * method. */ pj_str_t key; pjsip_role_e role; pjsip_transaction *tsx; if (rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) role = PJSIP_ROLE_UAS; else role = PJSIP_ROLE_UAC; pjsip_tsx_create_key(rdata->tp_info.pool, &key, role, pjsip_get_invite_method(), rdata); /* Lookup the INVITE transaction */ tsx = pjsip_tsx_layer_find_tsx2(&key, PJ_TRUE); /* We should find the dialog attached to the INVITE transaction */ if (tsx) { dlg = (pjsip_dialog*) tsx->mod_data[mod_ua.mod.id]; pj_grp_lock_dec_ref(tsx->grp_lock); /* Dlg may be NULL on some extreme condition * (e.g. during debugging where initially there is a dialog) */ return dlg ? (struct dlg_set*) dlg->dlg_set : NULL; } else { return NULL; } } else { pj_str_t *tag; struct dlg_set *dlg_set; if (rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) tag = &rdata->msg_info.to->tag; else tag = &rdata->msg_info.from->tag; /* Lookup the dialog set. */ dlg_set = (struct dlg_set*) pj_hash_get_lower(mod_ua.dlg_table, tag->ptr, (unsigned)tag->slen, NULL); return dlg_set; } } /* On received requests. */ static pj_bool_t mod_ua_on_rx_request(pjsip_rx_data *rdata) { struct dlg_set *dlg_set; pj_str_t *from_tag; pjsip_dialog *dlg; pj_status_t status; /* Optimized path: bail out early if request is not CANCEL and it doesn't * have To tag */ if (rdata->msg_info.to->tag.slen == 0 && rdata->msg_info.msg->line.req.method.id != PJSIP_CANCEL_METHOD) { return PJ_FALSE; } /* Incoming REGISTER may have tags in it */ if (rdata->msg_info.msg->line.req.method.id == PJSIP_REGISTER_METHOD) return PJ_FALSE; retry_on_deadlock: /* Lock user agent before looking up the dialog hash table. */ pj_mutex_lock(mod_ua.mutex); /* Lookup the dialog set, based on the To tag header. */ dlg_set = find_dlg_set_for_msg(rdata); /* If dialog is not found, respond with 481 (Call/Transaction * Does Not Exist). */ if (dlg_set == NULL) { /* Unable to find dialog. */ pj_mutex_unlock(mod_ua.mutex); if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) { PJ_LOG(5,(THIS_FILE, "Unable to find dialogset for %s, answering with 481", pjsip_rx_data_get_info(rdata))); /* Respond with 481 . */ pjsip_endpt_respond_stateless( mod_ua.endpt, rdata, 481, NULL, NULL, NULL ); } return PJ_TRUE; } /* Dialog set has been found. * Find the dialog in the dialog set based on the content of the remote * tag. */ from_tag = &rdata->msg_info.from->tag; dlg = dlg_set->dlg_list.next; while (dlg != (pjsip_dialog*)&dlg_set->dlg_list) { if (pj_stricmp(&dlg->remote.info->tag, from_tag) == 0) break; dlg = dlg->next; } /* Dialog may not be found, e.g. in this case: * - UAC sends SUBSCRIBE, then UAS sends NOTIFY before answering * SUBSCRIBE request with 2xx. * * In this case, we can accept the request ONLY when the original * dialog still has empty To tag. */ if (dlg == (pjsip_dialog*)&dlg_set->dlg_list) { pjsip_dialog *first_dlg = dlg_set->dlg_list.next; if (first_dlg->remote.info->tag.slen != 0) { /* Not found. Mulfunction UAC? */ pj_mutex_unlock(mod_ua.mutex); if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) { PJ_LOG(5,(THIS_FILE, "Unable to find dialog for %s, answering with 481", pjsip_rx_data_get_info(rdata))); pjsip_endpt_respond_stateless(mod_ua.endpt, rdata, PJSIP_SC_CALL_TSX_DOES_NOT_EXIST, NULL, NULL, NULL); } else { PJ_LOG(5,(THIS_FILE, "Unable to find dialog for %s", pjsip_rx_data_get_info(rdata))); } return PJ_TRUE; } dlg = first_dlg; } /* Mark the dialog id of the request. */ rdata->endpt_info.mod_data[mod_ua.mod.id] = dlg; /* Try to lock the dialog */ PJ_LOG(6,(dlg->obj_name, "UA layer acquiring dialog lock for request")); status = pjsip_dlg_try_inc_lock(dlg); if (status != PJ_SUCCESS) { /* Failed to acquire dialog mutex immediately, this could be * because of deadlock. Release UA mutex, yield, and retry * the whole thing once again. */ pj_mutex_unlock(mod_ua.mutex); pj_thread_sleep(0); goto retry_on_deadlock; } /* Done with processing in UA layer, release lock */ pj_mutex_unlock(mod_ua.mutex); /* Pass to dialog. */ pjsip_dlg_on_rx_request(dlg, rdata); /* Unlock the dialog. This may destroy the dialog */ pjsip_dlg_dec_lock(dlg); /* Report as handled. */ return PJ_TRUE; } /* On rx response notification. */ static pj_bool_t mod_ua_on_rx_response(pjsip_rx_data *rdata) { pjsip_transaction *tsx; struct dlg_set *dlg_set; pjsip_dialog *dlg; pj_status_t status; /* * Find the dialog instance for the response. * All outgoing dialog requests are sent statefully, which means * there will be an UAC transaction associated with this response, * and the dialog instance will be recorded in that transaction. * * But even when transaction is found, there is possibility that * the response is a forked response. */ retry_on_deadlock: dlg = NULL; /* Lock user agent dlg table before we're doing anything. */ pj_mutex_lock(mod_ua.mutex); /* Check if transaction is present. */ tsx = pjsip_rdata_get_tsx(rdata); if (tsx) { /* Check if dialog is present in the transaction. */ dlg = pjsip_tsx_get_dlg(tsx); if (!dlg) { /* Unlock dialog hash table. */ pj_mutex_unlock(mod_ua.mutex); return PJ_FALSE; } /* Get the dialog set. */ dlg_set = (struct dlg_set*) dlg->dlg_set; /* Even if transaction is found and (candidate) dialog has been * identified, it's possible that the request has forked. */ } else { /* Transaction is not present. * Check if this is a 2xx/OK response to INVITE, which in this * case the response will be handled directly by the * dialog. */ pjsip_cseq_hdr *cseq_hdr = rdata->msg_info.cseq; if (cseq_hdr->method.id != PJSIP_INVITE_METHOD || rdata->msg_info.msg->line.status.code / 100 != 2) { /* Not a 2xx response to INVITE. * This must be some stateless response sent by other modules, * or a very late response. */ /* Unlock dialog hash table. */ pj_mutex_unlock(mod_ua.mutex); return PJ_FALSE; } /* Get the dialog set. */ dlg_set = (struct dlg_set*) pj_hash_get_lower(mod_ua.dlg_table, rdata->msg_info.from->tag.ptr, (unsigned)rdata->msg_info.from->tag.slen, NULL); if (!dlg_set) { /* Unlock dialog hash table. */ pj_mutex_unlock(mod_ua.mutex); /* Strayed 2xx response!! */ PJ_LOG(4,(THIS_FILE, "Received strayed 2xx response (no dialog is found)" " from %s:%d: %s", rdata->pkt_info.src_name, rdata->pkt_info.src_port, pjsip_rx_data_get_info(rdata))); return PJ_TRUE; } } /* At this point, we must have the dialog set, and the dialog set * must have a dialog in the list. */ pj_assert(dlg_set && !pj_list_empty(&dlg_set->dlg_list)); /* Check for forked response. * Request will fork only for the initial INVITE request. */ //This doesn't work when there is authentication challenge, since //first_cseq evaluation will yield false. //if (rdata->msg_info.cseq->method.id == PJSIP_INVITE_METHOD && // rdata->msg_info.cseq->cseq == dlg_set->dlg_list.next->local.first_cseq) if (rdata->msg_info.cseq->method.id == PJSIP_INVITE_METHOD) { int st_code = rdata->msg_info.msg->line.status.code; pj_str_t *to_tag = &rdata->msg_info.to->tag; dlg = dlg_set->dlg_list.next; while (dlg != (pjsip_dialog*)&dlg_set->dlg_list) { /* If there is dialog with no remote tag (i.e. dialog has not * been established yet), then send this response to that * dialog. */ if (dlg->remote.info->tag.slen == 0) break; /* Otherwise find the one with matching To tag. */ if (pj_stricmp(to_tag, &dlg->remote.info->tag) == 0) break; dlg = dlg->next; } /* If no dialog with matching remote tag is found, this must be * a forked response. Respond to this ONLY when response is non-100 * provisional response OR a 2xx response. */ if (dlg == (pjsip_dialog*)&dlg_set->dlg_list && ((st_code/100==1 && st_code!=100) || st_code/100==2)) { PJ_LOG(5,(THIS_FILE, "Received forked %s for existing dialog %s", pjsip_rx_data_get_info(rdata), dlg_set->dlg_list.next->obj_name)); /* Report to application about forked condition. * Application can either create a dialog or ignore the response. */ if (mod_ua.param.on_dlg_forked) { dlg = (*mod_ua.param.on_dlg_forked)(dlg_set->dlg_list.next, rdata); if (dlg == NULL) { pj_mutex_unlock(mod_ua.mutex); return PJ_TRUE; } } else { dlg = dlg_set->dlg_list.next; PJ_LOG(4,(THIS_FILE, "Unhandled forked %s from %s:%d, response will be " "handed over to the first dialog", pjsip_rx_data_get_info(rdata), rdata->pkt_info.src_name, rdata->pkt_info.src_port)); } } else if (dlg == (pjsip_dialog*)&dlg_set->dlg_list) { /* For 100 or non-2xx response which has different To tag, * pass the response to the first dialog. */ dlg = dlg_set->dlg_list.next; } } else { /* Either this is a non-INVITE response, or subsequent INVITE * within dialog. The dialog should have been identified when * the transaction was found. */ pj_assert(tsx != NULL); pj_assert(dlg != NULL); } /* The dialog must have been found. */ pj_assert(dlg != NULL); /* Put the dialog instance in the rdata. */ rdata->endpt_info.mod_data[mod_ua.mod.id] = dlg; /* Attempt to acquire lock to the dialog. */ PJ_LOG(6,(dlg->obj_name, "UA layer acquiring dialog lock for response")); status = pjsip_dlg_try_inc_lock(dlg); if (status != PJ_SUCCESS) { /* Failed to acquire dialog mutex. This could indicate a deadlock * situation, and for safety, try to avoid deadlock by releasing * UA mutex, yield, and retry the whole processing once again. */ pj_mutex_unlock(mod_ua.mutex); pj_thread_sleep(0); goto retry_on_deadlock; } /* We're done with processing in the UA layer, we can release the mutex */ pj_mutex_unlock(mod_ua.mutex); /* Pass the response to the dialog. */ pjsip_dlg_on_rx_response(dlg, rdata); /* Unlock the dialog. This may destroy the dialog. */ pjsip_dlg_dec_lock(dlg); /* Done. */ return PJ_TRUE; } #if PJ_LOG_MAX_LEVEL >= 3 static void print_dialog( const char *title, pjsip_dialog *dlg, char *buf, pj_size_t size) { int len; char userinfo[PJSIP_MAX_URL_SIZE]; len = pjsip_hdr_print_on(dlg->remote.info, userinfo, sizeof(userinfo)); if (len < 0) pj_ansi_strcpy(userinfo, "<--uri too long-->"); else userinfo[len] = '\0'; len = pj_ansi_snprintf(buf, size, "%s[%s] %s", title, (dlg->state==PJSIP_DIALOG_STATE_NULL ? " - " : "est"), userinfo); if (len < 1 || len >= (int)size) { pj_ansi_strcpy(buf, "<--uri too long-->"); } else buf[len] = '\0'; } #endif /* * Dump user agent contents (e.g. all dialogs). */ PJ_DEF(void) pjsip_ua_dump(pj_bool_t detail) { #if PJ_LOG_MAX_LEVEL >= 3 pj_hash_iterator_t itbuf, *it; char dlginfo[128]; pj_mutex_lock(mod_ua.mutex); PJ_LOG(3, (THIS_FILE, "Number of dialog sets: %u", pj_hash_count(mod_ua.dlg_table))); if (detail && pj_hash_count(mod_ua.dlg_table)) { PJ_LOG(3, (THIS_FILE, "Dumping dialog sets:")); it = pj_hash_first(mod_ua.dlg_table, &itbuf); for (; it != NULL; it = pj_hash_next(mod_ua.dlg_table, it)) { struct dlg_set *dlg_set; pjsip_dialog *dlg; const char *title; dlg_set = (struct dlg_set*) pj_hash_this(mod_ua.dlg_table, it); if (!dlg_set || pj_list_empty(&dlg_set->dlg_list)) continue; /* First dialog in dialog set. */ dlg = dlg_set->dlg_list.next; if (dlg->role == PJSIP_ROLE_UAC) title = " [out] "; else title = " [in] "; print_dialog(title, dlg, dlginfo, sizeof(dlginfo)); PJ_LOG(3,(THIS_FILE, "%s", dlginfo)); /* Next dialog in dialog set (forked) */ dlg = dlg->next; while (dlg != (pjsip_dialog*) &dlg_set->dlg_list) { print_dialog(" [forked] ", dlg, dlginfo, sizeof(dlginfo)); dlg = dlg->next; } } } pj_mutex_unlock(mod_ua.mutex); #endif }