| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * 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 <pjsip/sip_transaction.h> |
| #include <pjsip/sip_util.h> |
| #include <pjsip/sip_module.h> |
| #include <pjsip/sip_endpoint.h> |
| #include <pjsip/sip_errno.h> |
| #include <pjsip/sip_event.h> |
| #include <pjlib-util/errno.h> |
| #include <pj/hash.h> |
| #include <pj/pool.h> |
| #include <pj/os.h> |
| #include <pj/rand.h> |
| #include <pj/string.h> |
| #include <pj/assert.h> |
| #include <pj/guid.h> |
| #include <pj/log.h> |
| |
| #define THIS_FILE "sip_transaction.c" |
| |
| #if 0 |
| #define TSX_TRACE_(expr) PJ_LOG(3,expr) |
| #else |
| #define TSX_TRACE_(expr) |
| #endif |
| |
| /* When this macro is set, transaction will keep the hashed value |
| * so that future lookup (to unregister transaction) does not need |
| * to recalculate the hash again. It should gains a little bit of |
| * performance, so generally we'd want this. |
| */ |
| #define PRECALC_HASH |
| |
| |
| /* Defined in sip_util_statefull.c */ |
| extern pjsip_module mod_stateful_util; |
| |
| |
| /***************************************************************************** |
| ** |
| ** Declarations and static variable definitions section. |
| ** |
| ***************************************************************************** |
| **/ |
| /* Prototypes. */ |
| static pj_status_t mod_tsx_layer_load(pjsip_endpoint *endpt); |
| static pj_status_t mod_tsx_layer_start(void); |
| static pj_status_t mod_tsx_layer_stop(void); |
| static pj_status_t mod_tsx_layer_unload(void); |
| static pj_bool_t mod_tsx_layer_on_rx_request(pjsip_rx_data *rdata); |
| static pj_bool_t mod_tsx_layer_on_rx_response(pjsip_rx_data *rdata); |
| |
| /* Transaction layer module definition. */ |
| static struct mod_tsx_layer |
| { |
| struct pjsip_module mod; |
| pj_pool_t *pool; |
| pjsip_endpoint *endpt; |
| pj_mutex_t *mutex; |
| pj_hash_table_t *htable; |
| } mod_tsx_layer = |
| { { |
| NULL, NULL, /* List's prev and next. */ |
| { "mod-tsx-layer", 13 }, /* Module name. */ |
| -1, /* Module ID */ |
| PJSIP_MOD_PRIORITY_TSX_LAYER, /* Priority. */ |
| mod_tsx_layer_load, /* load(). */ |
| mod_tsx_layer_start, /* start() */ |
| mod_tsx_layer_stop, /* stop() */ |
| mod_tsx_layer_unload, /* unload() */ |
| mod_tsx_layer_on_rx_request, /* on_rx_request() */ |
| mod_tsx_layer_on_rx_response, /* on_rx_response() */ |
| NULL |
| } |
| }; |
| |
| /* Transaction state names */ |
| static const char *state_str[] = |
| { |
| "Null", |
| "Calling", |
| "Trying", |
| "Proceeding", |
| "Completed", |
| "Confirmed", |
| "Terminated", |
| "Destroyed", |
| }; |
| |
| /* Role names */ |
| static const char *role_name[] = |
| { |
| "UAC", |
| "UAS" |
| }; |
| |
| /* Transport flag. */ |
| enum |
| { |
| TSX_HAS_PENDING_TRANSPORT = 1, |
| TSX_HAS_PENDING_RESCHED = 2, |
| TSX_HAS_PENDING_SEND = 4, |
| TSX_HAS_PENDING_DESTROY = 8, |
| TSX_HAS_RESOLVED_SERVER = 16, |
| }; |
| |
| /* Timer timeout value constants */ |
| static pj_time_val t1_timer_val = { PJSIP_T1_TIMEOUT/1000, |
| PJSIP_T1_TIMEOUT%1000 }; |
| static pj_time_val t2_timer_val = { PJSIP_T2_TIMEOUT/1000, |
| PJSIP_T2_TIMEOUT%1000 }; |
| static pj_time_val t4_timer_val = { PJSIP_T4_TIMEOUT/1000, |
| PJSIP_T4_TIMEOUT%1000 }; |
| static pj_time_val td_timer_val = { PJSIP_TD_TIMEOUT/1000, |
| PJSIP_TD_TIMEOUT%1000 }; |
| static pj_time_val timeout_timer_val = { (64*PJSIP_T1_TIMEOUT)/1000, |
| (64*PJSIP_T1_TIMEOUT)%1000 }; |
| |
| #define TIMER_INACTIVE 0 |
| #define RETRANSMIT_TIMER 1 |
| #define TIMEOUT_TIMER 2 |
| #define TRANSPORT_ERR_TIMER 3 |
| |
| |
| /* Prototypes. */ |
| static pj_status_t tsx_on_state_null( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_calling( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_trying( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_proceeding_uac( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_completed_uas( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_completed_uac( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_confirmed( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_terminated( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static pj_status_t tsx_on_state_destroyed( pjsip_transaction *tsx, |
| pjsip_event *event); |
| static void tsx_timer_callback( pj_timer_heap_t *theap, |
| pj_timer_entry *entry); |
| static void tsx_tp_state_callback( |
| pjsip_transport *tp, |
| pjsip_transport_state state, |
| const pjsip_transport_state_info *info); |
| static void tsx_set_state( pjsip_transaction *tsx, |
| pjsip_tsx_state_e state, |
| pjsip_event_id_e event_src_type, |
| void *event_src ); |
| static void tsx_set_state_no_notify( pjsip_transaction *tsx, |
| pjsip_tsx_state_e state, |
| pjsip_event_id_e event_src_type, |
| void *event_src ); |
| static void tsx_set_status_code(pjsip_transaction *tsx, |
| int code, const pj_str_t *reason); |
| static pj_status_t tsx_create( pjsip_module *tsx_user, |
| pj_grp_lock_t *grp_lock, |
| pjsip_transaction **p_tsx); |
| static void tsx_on_destroy(void *arg); |
| static pj_status_t tsx_shutdown( pjsip_transaction *tsx ); |
| static void tsx_resched_retransmission( pjsip_transaction *tsx ); |
| static pj_status_t tsx_retransmit( pjsip_transaction *tsx, int resched); |
| static int tsx_send_msg( pjsip_transaction *tsx, |
| pjsip_tx_data *tdata); |
| static void tsx_update_transport( pjsip_transaction *tsx, |
| pjsip_transport *tp); |
| |
| |
| /* State handlers for UAC, indexed by state */ |
| static int (*tsx_state_handler_uac[PJSIP_TSX_STATE_MAX])(pjsip_transaction *, |
| pjsip_event *) = |
| { |
| &tsx_on_state_null, |
| &tsx_on_state_calling, |
| NULL, |
| &tsx_on_state_proceeding_uac, |
| &tsx_on_state_completed_uac, |
| &tsx_on_state_confirmed, |
| &tsx_on_state_terminated, |
| &tsx_on_state_destroyed, |
| }; |
| |
| /* State handlers for UAS */ |
| static int (*tsx_state_handler_uas[PJSIP_TSX_STATE_MAX])(pjsip_transaction *, |
| pjsip_event *) = |
| { |
| &tsx_on_state_null, |
| NULL, |
| &tsx_on_state_trying, |
| &tsx_on_state_proceeding_uas, |
| &tsx_on_state_completed_uas, |
| &tsx_on_state_confirmed, |
| &tsx_on_state_terminated, |
| &tsx_on_state_destroyed, |
| }; |
| |
| /***************************************************************************** |
| ** |
| ** Utilities |
| ** |
| ***************************************************************************** |
| */ |
| /* |
| * Get transaction state name. |
| */ |
| PJ_DEF(const char *) pjsip_tsx_state_str(pjsip_tsx_state_e state) |
| { |
| return state_str[state]; |
| } |
| |
| /* |
| * Get the role name. |
| */ |
| PJ_DEF(const char *) pjsip_role_name(pjsip_role_e role) |
| { |
| return role_name[role]; |
| } |
| |
| |
| /* |
| * Create transaction key for RFC2543 compliant messages, which don't have |
| * unique branch parameter in the top most Via header. |
| * |
| * INVITE requests matches a transaction if the following attributes |
| * match the original request: |
| * - Request-URI |
| * - To tag |
| * - From tag |
| * - Call-ID |
| * - CSeq |
| * - top Via header |
| * |
| * CANCEL matching is done similarly as INVITE, except: |
| * - CSeq method will differ |
| * - To tag is not matched. |
| * |
| * ACK matching is done similarly, except that: |
| * - method of the CSeq will differ, |
| * - To tag is matched to the response sent by the server transaction. |
| * |
| * The transaction key is constructed from the common components of above |
| * components. Additional comparison is needed to fully match a transaction. |
| */ |
| static pj_status_t create_tsx_key_2543( pj_pool_t *pool, |
| pj_str_t *str, |
| pjsip_role_e role, |
| const pjsip_method *method, |
| const pjsip_rx_data *rdata ) |
| { |
| #define SEPARATOR '$' |
| char *key, *p; |
| pj_ssize_t len; |
| pj_size_t len_required; |
| pj_str_t *host; |
| |
| PJ_ASSERT_RETURN(pool && str && method && rdata, PJ_EINVAL); |
| PJ_ASSERT_RETURN(rdata->msg_info.msg, PJ_EINVAL); |
| PJ_ASSERT_RETURN(rdata->msg_info.via, PJSIP_EMISSINGHDR); |
| PJ_ASSERT_RETURN(rdata->msg_info.cseq, PJSIP_EMISSINGHDR); |
| PJ_ASSERT_RETURN(rdata->msg_info.from, PJSIP_EMISSINGHDR); |
| |
| host = &rdata->msg_info.via->sent_by.host; |
| |
| /* Calculate length required. */ |
| len_required = 9 + /* CSeq number */ |
| rdata->msg_info.from->tag.slen + /* From tag. */ |
| rdata->msg_info.cid->id.slen + /* Call-ID */ |
| host->slen + /* Via host. */ |
| 9 + /* Via port. */ |
| 16; /* Separator+Allowance. */ |
| key = p = (char*) pj_pool_alloc(pool, len_required); |
| |
| /* Add role. */ |
| *p++ = (char)(role==PJSIP_ROLE_UAC ? 'c' : 's'); |
| *p++ = SEPARATOR; |
| |
| /* Add method, except when method is INVITE or ACK. */ |
| if (method->id != PJSIP_INVITE_METHOD && method->id != PJSIP_ACK_METHOD) { |
| pj_memcpy(p, method->name.ptr, method->name.slen); |
| p += method->name.slen; |
| *p++ = '$'; |
| } |
| |
| /* Add CSeq (only the number). */ |
| len = pj_utoa(rdata->msg_info.cseq->cseq, p); |
| p += len; |
| *p++ = SEPARATOR; |
| |
| /* Add From tag. */ |
| len = rdata->msg_info.from->tag.slen; |
| pj_memcpy( p, rdata->msg_info.from->tag.ptr, len); |
| p += len; |
| *p++ = SEPARATOR; |
| |
| /* Add Call-ID. */ |
| len = rdata->msg_info.cid->id.slen; |
| pj_memcpy( p, rdata->msg_info.cid->id.ptr, len ); |
| p += len; |
| *p++ = SEPARATOR; |
| |
| /* Add top Via header. |
| * We don't really care whether the port contains the real port (because |
| * it can be omited if default port is used). Anyway this function is |
| * only used to match request retransmission, and we expect that the |
| * request retransmissions will contain the same port. |
| */ |
| pj_memcpy(p, host->ptr, host->slen); |
| p += host->slen; |
| *p++ = ':'; |
| |
| len = pj_utoa(rdata->msg_info.via->sent_by.port, p); |
| p += len; |
| *p++ = SEPARATOR; |
| |
| *p++ = '\0'; |
| |
| /* Done. */ |
| str->ptr = key; |
| str->slen = p-key; |
| |
| return PJ_SUCCESS; |
| } |
| |
| /* |
| * Create transaction key for RFC3161 compliant system. |
| */ |
| static pj_status_t create_tsx_key_3261( pj_pool_t *pool, |
| pj_str_t *key, |
| pjsip_role_e role, |
| const pjsip_method *method, |
| const pj_str_t *branch) |
| { |
| char *p; |
| |
| PJ_ASSERT_RETURN(pool && key && method && branch, PJ_EINVAL); |
| |
| p = key->ptr = (char*) |
| pj_pool_alloc(pool, branch->slen + method->name.slen + 4 ); |
| |
| /* Add role. */ |
| *p++ = (char)(role==PJSIP_ROLE_UAC ? 'c' : 's'); |
| *p++ = SEPARATOR; |
| |
| /* Add method, except when method is INVITE or ACK. */ |
| if (method->id != PJSIP_INVITE_METHOD && method->id != PJSIP_ACK_METHOD) { |
| pj_memcpy(p, method->name.ptr, method->name.slen); |
| p += method->name.slen; |
| *p++ = '$'; |
| } |
| |
| /* Add branch ID. */ |
| pj_memcpy(p, branch->ptr, branch->slen); |
| p += branch->slen; |
| |
| /* Set length */ |
| key->slen = p - key->ptr; |
| |
| return PJ_SUCCESS; |
| } |
| |
| /* |
| * Create key from the incoming data, to be used to search the transaction |
| * in the transaction hash table. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_create_key( pj_pool_t *pool, pj_str_t *key, |
| pjsip_role_e role, |
| const pjsip_method *method, |
| const pjsip_rx_data *rdata) |
| { |
| pj_str_t rfc3261_branch = {PJSIP_RFC3261_BRANCH_ID, |
| PJSIP_RFC3261_BRANCH_LEN}; |
| |
| |
| /* Get the branch parameter in the top-most Via. |
| * If branch parameter is started with "z9hG4bK", then the message was |
| * generated by agent compliant with RFC3261. Otherwise, it will be |
| * handled as RFC2543. |
| */ |
| const pj_str_t *branch = &rdata->msg_info.via->branch_param; |
| |
| if (pj_strnicmp(branch,&rfc3261_branch,PJSIP_RFC3261_BRANCH_LEN)==0) { |
| |
| /* Create transaction key. */ |
| return create_tsx_key_3261(pool, key, role, method, branch); |
| |
| } else { |
| /* Create the key for the message. This key will be matched up |
| * with the transaction key. For RFC2563 transactions, the |
| * transaction key was created by the same function, so it will |
| * match the message. |
| */ |
| return create_tsx_key_2543( pool, key, role, method, rdata ); |
| } |
| } |
| |
| /***************************************************************************** |
| ** |
| ** Transaction layer module |
| ** |
| ***************************************************************************** |
| **/ |
| /* |
| * Create transaction layer module and registers it to the endpoint. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_layer_init_module(pjsip_endpoint *endpt) |
| { |
| pj_pool_t *pool; |
| pj_status_t status; |
| |
| |
| PJ_ASSERT_RETURN(mod_tsx_layer.endpt==NULL, PJ_EINVALIDOP); |
| |
| /* Initialize timer values */ |
| t1_timer_val.sec = pjsip_cfg()->tsx.t1 / 1000; |
| t1_timer_val.msec = pjsip_cfg()->tsx.t1 % 1000; |
| t2_timer_val.sec = pjsip_cfg()->tsx.t2 / 1000; |
| t2_timer_val.msec = pjsip_cfg()->tsx.t2 % 1000; |
| t4_timer_val.sec = pjsip_cfg()->tsx.t4 / 1000; |
| t4_timer_val.msec = pjsip_cfg()->tsx.t4 % 1000; |
| td_timer_val.sec = pjsip_cfg()->tsx.td / 1000; |
| td_timer_val.msec = pjsip_cfg()->tsx.td % 1000; |
| /* Changed the initialization below to use td_timer_val instead, to enable |
| * customization to the timeout value. |
| */ |
| //timeout_timer_val.sec = (64 * pjsip_cfg()->tsx.t1) / 1000; |
| //timeout_timer_val.msec = (64 * pjsip_cfg()->tsx.t1) % 1000; |
| timeout_timer_val = td_timer_val; |
| |
| /* |
| * Initialize transaction layer structure. |
| */ |
| |
| /* Create pool for the module. */ |
| pool = pjsip_endpt_create_pool(endpt, "tsxlayer", |
| PJSIP_POOL_TSX_LAYER_LEN, |
| PJSIP_POOL_TSX_LAYER_INC ); |
| if (!pool) |
| return PJ_ENOMEM; |
| |
| |
| /* Initialize some attributes. */ |
| mod_tsx_layer.pool = pool; |
| mod_tsx_layer.endpt = endpt; |
| |
| |
| /* Create hash table. */ |
| mod_tsx_layer.htable = pj_hash_create( pool, pjsip_cfg()->tsx.max_count ); |
| if (!mod_tsx_layer.htable) { |
| pjsip_endpt_release_pool(endpt, pool); |
| return PJ_ENOMEM; |
| } |
| |
| /* Create group lock. */ |
| status = pj_mutex_create_recursive(pool, "tsxlayer", &mod_tsx_layer.mutex); |
| if (status != PJ_SUCCESS) { |
| pjsip_endpt_release_pool(endpt, pool); |
| return status; |
| } |
| |
| /* |
| * Register transaction layer module to endpoint. |
| */ |
| status = pjsip_endpt_register_module( endpt, &mod_tsx_layer.mod ); |
| if (status != PJ_SUCCESS) { |
| pj_mutex_destroy(mod_tsx_layer.mutex); |
| pjsip_endpt_release_pool(endpt, pool); |
| return status; |
| } |
| |
| /* Register mod_stateful_util module (sip_util_statefull.c) */ |
| status = pjsip_endpt_register_module(endpt, &mod_stateful_util); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Get the instance of transaction layer module. |
| */ |
| PJ_DEF(pjsip_module*) pjsip_tsx_layer_instance(void) |
| { |
| return &mod_tsx_layer.mod; |
| } |
| |
| |
| /* |
| * Unregister and destroy transaction layer module. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_layer_destroy(void) |
| { |
| /* Are we registered? */ |
| PJ_ASSERT_RETURN(mod_tsx_layer.endpt!=NULL, PJ_EINVALIDOP); |
| |
| /* Unregister from endpoint. |
| * Clean-ups will be done in the unload() module callback. |
| */ |
| return pjsip_endpt_unregister_module( mod_tsx_layer.endpt, |
| &mod_tsx_layer.mod); |
| } |
| |
| |
| /* |
| * Register the transaction to the hash table. |
| */ |
| static pj_status_t mod_tsx_layer_register_tsx( pjsip_transaction *tsx) |
| { |
| pj_assert(tsx->transaction_key.slen != 0); |
| |
| /* Lock hash table mutex. */ |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| |
| /* Check if no transaction with the same key exists. |
| * Do not use PJ_ASSERT_RETURN since it evaluates the expression |
| * twice! |
| */ |
| if(pj_hash_get_lower(mod_tsx_layer.htable, |
| tsx->transaction_key.ptr, |
| (unsigned)tsx->transaction_key.slen, |
| NULL)) |
| { |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| PJ_LOG(2,(THIS_FILE, |
| "Unable to register %.*s transaction (key exists)", |
| (int)tsx->method.name.slen, |
| tsx->method.name.ptr)); |
| return PJ_EEXISTS; |
| } |
| |
| TSX_TRACE_((THIS_FILE, |
| "Transaction %p registered with hkey=0x%p and key=%.*s", |
| tsx, tsx->hashed_key, tsx->transaction_key.slen, |
| tsx->transaction_key.ptr)); |
| |
| /* Register the transaction to the hash table. */ |
| #ifdef PRECALC_HASH |
| pj_hash_set_lower( tsx->pool, mod_tsx_layer.htable, |
| tsx->transaction_key.ptr, |
| (unsigned)tsx->transaction_key.slen, |
| tsx->hashed_key, tsx); |
| #else |
| pj_hash_set_lower( tsx->pool, mod_tsx_layer.htable, |
| tsx->transaction_key.ptr, |
| tsx->transaction_key.slen, 0, tsx); |
| #endif |
| |
| /* Unlock mutex. */ |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Unregister the transaction from the hash table. |
| */ |
| static void mod_tsx_layer_unregister_tsx( pjsip_transaction *tsx) |
| { |
| if (mod_tsx_layer.mod.id == -1) { |
| /* The transaction layer has been unregistered. This could happen |
| * if the transaction was pending on transport and the application |
| * is shutdown. See http://trac.pjsip.org/repos/ticket/1033. In |
| * this case just do nothing. |
| */ |
| return; |
| } |
| |
| pj_assert(tsx->transaction_key.slen != 0); |
| //pj_assert(tsx->state != PJSIP_TSX_STATE_NULL); |
| |
| /* Lock hash table mutex. */ |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| |
| /* Register the transaction to the hash table. */ |
| #ifdef PRECALC_HASH |
| pj_hash_set_lower( NULL, mod_tsx_layer.htable, tsx->transaction_key.ptr, |
| (unsigned)tsx->transaction_key.slen, tsx->hashed_key, |
| NULL); |
| #else |
| pj_hash_set_lower( NULL, mod_tsx_layer.htable, tsx->transaction_key.ptr, |
| tsx->transaction_key.slen, 0, NULL); |
| #endif |
| |
| TSX_TRACE_((THIS_FILE, |
| "Transaction %p unregistered, hkey=0x%p and key=%.*s", |
| tsx, tsx->hashed_key, tsx->transaction_key.slen, |
| tsx->transaction_key.ptr)); |
| |
| /* Unlock mutex. */ |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| } |
| |
| |
| /* |
| * Retrieve the current number of transactions currently registered in |
| * the hash table. |
| */ |
| PJ_DEF(unsigned) pjsip_tsx_layer_get_tsx_count(void) |
| { |
| unsigned count; |
| |
| /* Are we registered? */ |
| PJ_ASSERT_RETURN(mod_tsx_layer.endpt!=NULL, 0); |
| |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| count = pj_hash_count(mod_tsx_layer.htable); |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| |
| return count; |
| } |
| |
| |
| /* |
| * Find a transaction. |
| */ |
| PJ_DEF(pjsip_transaction*) pjsip_tsx_layer_find_tsx( const pj_str_t *key, |
| pj_bool_t lock ) |
| { |
| pjsip_transaction *tsx; |
| pj_uint32_t hval = 0; |
| |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| tsx = (pjsip_transaction*) |
| pj_hash_get_lower( mod_tsx_layer.htable, key->ptr, |
| (unsigned)key->slen, &hval ); |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| |
| TSX_TRACE_((THIS_FILE, |
| "Finding tsx with hkey=0x%p and key=%.*s: found %p", |
| hval, key->slen, key->ptr, tsx)); |
| |
| /* Race condition! |
| * Transaction may gets deleted before we have chance to lock it. |
| */ |
| PJ_TODO(FIX_RACE_CONDITION_HERE); |
| PJ_RACE_ME(5); |
| |
| if (tsx && lock) |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| return tsx; |
| } |
| |
| |
| /* This module callback is called when module is being loaded by |
| * endpoint. It does nothing for this module. |
| */ |
| static pj_status_t mod_tsx_layer_load(pjsip_endpoint *endpt) |
| { |
| PJ_UNUSED_ARG(endpt); |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* This module callback is called when module is being started by |
| * endpoint. It does nothing for this module. |
| */ |
| static pj_status_t mod_tsx_layer_start(void) |
| { |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* This module callback is called when module is being stopped by |
| * endpoint. |
| */ |
| static pj_status_t mod_tsx_layer_stop(void) |
| { |
| pj_hash_iterator_t it_buf, *it; |
| |
| PJ_LOG(4,(THIS_FILE, "Stopping transaction layer module")); |
| |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| |
| /* Destroy all transactions. */ |
| it = pj_hash_first(mod_tsx_layer.htable, &it_buf); |
| while (it) { |
| pjsip_transaction *tsx = (pjsip_transaction*) |
| pj_hash_this(mod_tsx_layer.htable, it); |
| pj_hash_iterator_t *next = pj_hash_next(mod_tsx_layer.htable, it); |
| if (tsx) { |
| pjsip_tsx_terminate(tsx, PJSIP_SC_SERVICE_UNAVAILABLE); |
| mod_tsx_layer_unregister_tsx(tsx); |
| tsx_shutdown(tsx); |
| } |
| it = next; |
| } |
| |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| |
| PJ_LOG(4,(THIS_FILE, "Stopped transaction layer module")); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* Destroy this module */ |
| static void tsx_layer_destroy(pjsip_endpoint *endpt) |
| { |
| PJ_UNUSED_ARG(endpt); |
| |
| /* Destroy mutex. */ |
| pj_mutex_destroy(mod_tsx_layer.mutex); |
| |
| /* Release pool. */ |
| pjsip_endpt_release_pool(mod_tsx_layer.endpt, mod_tsx_layer.pool); |
| |
| /* Mark as unregistered. */ |
| mod_tsx_layer.endpt = NULL; |
| |
| PJ_LOG(4,(THIS_FILE, "Transaction layer module destroyed")); |
| } |
| |
| |
| /* This module callback is called when module is being unloaded by |
| * endpoint. |
| */ |
| static pj_status_t mod_tsx_layer_unload(void) |
| { |
| /* Only self destroy when there's no transaction in the table. |
| * Transaction may refuse to destroy when it has pending |
| * transmission. If we destroy the module now, application will |
| * crash when the pending transaction finally got error response |
| * from transport and when it tries to unregister itself. |
| */ |
| if (pj_hash_count(mod_tsx_layer.htable) != 0) { |
| if (pjsip_endpt_atexit(mod_tsx_layer.endpt, &tsx_layer_destroy) != |
| PJ_SUCCESS) |
| { |
| PJ_LOG(3,(THIS_FILE, "Failed to register transaction layer " |
| "module destroy.")); |
| } |
| return PJ_EBUSY; |
| } |
| |
| tsx_layer_destroy(mod_tsx_layer.endpt); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* This module callback is called when endpoint has received an |
| * incoming request message. |
| */ |
| static pj_bool_t mod_tsx_layer_on_rx_request(pjsip_rx_data *rdata) |
| { |
| pj_str_t key; |
| pj_uint32_t hval = 0; |
| pjsip_transaction *tsx; |
| |
| pjsip_tsx_create_key(rdata->tp_info.pool, &key, PJSIP_ROLE_UAS, |
| &rdata->msg_info.cseq->method, rdata); |
| |
| /* Find transaction. */ |
| pj_mutex_lock( mod_tsx_layer.mutex ); |
| |
| tsx = (pjsip_transaction*) |
| pj_hash_get_lower( mod_tsx_layer.htable, key.ptr, (unsigned)key.slen, |
| &hval ); |
| |
| |
| TSX_TRACE_((THIS_FILE, |
| "Finding tsx for request, hkey=0x%p and key=%.*s, found %p", |
| hval, key.slen, key.ptr, tsx)); |
| |
| |
| if (tsx == NULL || tsx->state == PJSIP_TSX_STATE_TERMINATED) { |
| /* Transaction not found. |
| * Reject the request so that endpoint passes the request to |
| * upper layer modules. |
| */ |
| pj_mutex_unlock( mod_tsx_layer.mutex); |
| return PJ_FALSE; |
| } |
| |
| /* Unlock hash table. */ |
| pj_mutex_unlock( mod_tsx_layer.mutex ); |
| |
| /* Race condition! |
| * Transaction may gets deleted before we have chance to lock it |
| * in pjsip_tsx_recv_msg(). |
| */ |
| PJ_TODO(FIX_RACE_CONDITION_HERE); |
| PJ_RACE_ME(5); |
| |
| /* Pass the message to the transaction. */ |
| pjsip_tsx_recv_msg(tsx, rdata ); |
| |
| return PJ_TRUE; |
| } |
| |
| |
| /* This module callback is called when endpoint has received an |
| * incoming response message. |
| */ |
| static pj_bool_t mod_tsx_layer_on_rx_response(pjsip_rx_data *rdata) |
| { |
| pj_str_t key; |
| pj_uint32_t hval = 0; |
| pjsip_transaction *tsx; |
| |
| pjsip_tsx_create_key(rdata->tp_info.pool, &key, PJSIP_ROLE_UAC, |
| &rdata->msg_info.cseq->method, rdata); |
| |
| /* Find transaction. */ |
| pj_mutex_lock( mod_tsx_layer.mutex ); |
| |
| tsx = (pjsip_transaction*) |
| pj_hash_get_lower( mod_tsx_layer.htable, key.ptr, (unsigned)key.slen, |
| &hval ); |
| |
| |
| TSX_TRACE_((THIS_FILE, |
| "Finding tsx for response, hkey=0x%p and key=%.*s, found %p", |
| hval, key.slen, key.ptr, tsx)); |
| |
| |
| if (tsx == NULL || tsx->state == PJSIP_TSX_STATE_TERMINATED) { |
| /* Transaction not found. |
| * Reject the request so that endpoint passes the request to |
| * upper layer modules. |
| */ |
| pj_mutex_unlock( mod_tsx_layer.mutex); |
| return PJ_FALSE; |
| } |
| |
| /* Unlock hash table. */ |
| pj_mutex_unlock( mod_tsx_layer.mutex ); |
| |
| /* Race condition! |
| * Transaction may gets deleted before we have chance to lock it |
| * in pjsip_tsx_recv_msg(). |
| */ |
| PJ_TODO(FIX_RACE_CONDITION_HERE); |
| PJ_RACE_ME(5); |
| |
| /* Pass the message to the transaction. */ |
| pjsip_tsx_recv_msg(tsx, rdata ); |
| |
| return PJ_TRUE; |
| } |
| |
| |
| /* |
| * Get transaction instance in the rdata. |
| */ |
| PJ_DEF(pjsip_transaction*) pjsip_rdata_get_tsx( pjsip_rx_data *rdata ) |
| { |
| return (pjsip_transaction*) |
| rdata->endpt_info.mod_data[mod_tsx_layer.mod.id]; |
| } |
| |
| |
| /* |
| * Dump transaction layer. |
| */ |
| PJ_DEF(void) pjsip_tsx_layer_dump(pj_bool_t detail) |
| { |
| #if PJ_LOG_MAX_LEVEL >= 3 |
| pj_hash_iterator_t itbuf, *it; |
| |
| /* Lock mutex. */ |
| pj_mutex_lock(mod_tsx_layer.mutex); |
| |
| PJ_LOG(3, (THIS_FILE, "Dumping transaction table:")); |
| PJ_LOG(3, (THIS_FILE, " Total %d transactions", |
| pj_hash_count(mod_tsx_layer.htable))); |
| |
| if (detail) { |
| it = pj_hash_first(mod_tsx_layer.htable, &itbuf); |
| if (it == NULL) { |
| PJ_LOG(3, (THIS_FILE, " - none - ")); |
| } else { |
| while (it != NULL) { |
| pjsip_transaction *tsx = (pjsip_transaction*) |
| pj_hash_this(mod_tsx_layer.htable,it); |
| |
| PJ_LOG(3, (THIS_FILE, " %s %s|%d|%s", |
| tsx->obj_name, |
| (tsx->last_tx? |
| pjsip_tx_data_get_info(tsx->last_tx): |
| "none"), |
| tsx->status_code, |
| pjsip_tsx_state_str(tsx->state))); |
| |
| it = pj_hash_next(mod_tsx_layer.htable, it); |
| } |
| } |
| } |
| |
| /* Unlock mutex. */ |
| pj_mutex_unlock(mod_tsx_layer.mutex); |
| #endif |
| } |
| |
| /***************************************************************************** |
| ** |
| ** Transaction |
| ** |
| ***************************************************************************** |
| **/ |
| /* Lock transaction for accessing the timeout timer only. */ |
| static void lock_timer(pjsip_transaction *tsx) |
| { |
| pj_mutex_lock(tsx->mutex_b); |
| } |
| |
| /* Unlock timer */ |
| static void unlock_timer(pjsip_transaction *tsx) |
| { |
| pj_mutex_unlock(tsx->mutex_b); |
| } |
| |
| /* Utility: schedule a timer */ |
| static pj_status_t tsx_schedule_timer(pjsip_transaction *tsx, |
| pj_timer_entry *entry, |
| const pj_time_val *delay, |
| int active_id) |
| { |
| pj_timer_heap_t *timer_heap = pjsip_endpt_get_timer_heap(tsx->endpt); |
| pj_status_t status; |
| |
| pj_assert(active_id != 0); |
| status = pj_timer_heap_schedule_w_grp_lock(timer_heap, entry, |
| delay, active_id, |
| tsx->grp_lock); |
| |
| return status; |
| } |
| |
| /* Utility: cancel a timer */ |
| static int tsx_cancel_timer(pjsip_transaction *tsx, |
| pj_timer_entry *entry) |
| { |
| pj_timer_heap_t *timer_heap = pjsip_endpt_get_timer_heap(tsx->endpt); |
| return pj_timer_heap_cancel_if_active(timer_heap, entry, TIMER_INACTIVE); |
| } |
| |
| /* Create and initialize basic transaction structure. |
| * This function is called by both UAC and UAS creation. |
| */ |
| static pj_status_t tsx_create( pjsip_module *tsx_user, |
| pj_grp_lock_t *grp_lock, |
| pjsip_transaction **p_tsx) |
| { |
| pj_pool_t *pool; |
| pjsip_transaction *tsx; |
| pj_status_t status; |
| |
| pool = pjsip_endpt_create_pool( mod_tsx_layer.endpt, "tsx", |
| PJSIP_POOL_TSX_LEN, PJSIP_POOL_TSX_INC ); |
| if (!pool) |
| return PJ_ENOMEM; |
| |
| tsx = PJ_POOL_ZALLOC_T(pool, pjsip_transaction); |
| tsx->pool = pool; |
| tsx->tsx_user = tsx_user; |
| tsx->endpt = mod_tsx_layer.endpt; |
| |
| pj_ansi_snprintf(tsx->obj_name, sizeof(tsx->obj_name), |
| "tsx%p", tsx); |
| pj_memcpy(pool->obj_name, tsx->obj_name, sizeof(pool->obj_name)); |
| |
| tsx->handle_200resp = 1; |
| tsx->retransmit_timer.id = TIMER_INACTIVE; |
| tsx->retransmit_timer.user_data = tsx; |
| tsx->retransmit_timer.cb = &tsx_timer_callback; |
| tsx->timeout_timer.id = TIMER_INACTIVE; |
| tsx->timeout_timer.user_data = tsx; |
| tsx->timeout_timer.cb = &tsx_timer_callback; |
| |
| if (grp_lock) { |
| tsx->grp_lock = grp_lock; |
| } else { |
| status = pj_grp_lock_create(pool, NULL, &tsx->grp_lock); |
| if (status != PJ_SUCCESS) { |
| pjsip_endpt_release_pool(mod_tsx_layer.endpt, pool); |
| return status; |
| } |
| } |
| |
| pj_grp_lock_add_ref(tsx->grp_lock); |
| pj_grp_lock_add_handler(tsx->grp_lock, tsx->pool, tsx, &tsx_on_destroy); |
| |
| status = pj_mutex_create_simple(pool, tsx->obj_name, &tsx->mutex_b); |
| if (status != PJ_SUCCESS) { |
| tsx_shutdown(tsx); |
| return status; |
| } |
| |
| *p_tsx = tsx; |
| return PJ_SUCCESS; |
| } |
| |
| /* Really destroy transaction, when grp_lock reference is zero */ |
| static void tsx_on_destroy( void *arg ) |
| { |
| pjsip_transaction *tsx = (pjsip_transaction*)arg; |
| |
| PJ_LOG(5,(tsx->obj_name, "Transaction destroyed!")); |
| |
| pj_mutex_destroy(tsx->mutex_b); |
| pjsip_endpt_release_pool(tsx->endpt, tsx->pool); |
| } |
| |
| /* Shutdown transaction. */ |
| static pj_status_t tsx_shutdown( pjsip_transaction *tsx ) |
| { |
| /* Release the transport */ |
| tsx_update_transport(tsx, NULL); |
| |
| /* Decrement reference counter in transport selector, only if |
| * we haven't been called before */ |
| if (!tsx->terminating) { |
| pjsip_tpselector_dec_ref(&tsx->tp_sel); |
| } |
| |
| /* Free last transmitted message. */ |
| if (tsx->last_tx) { |
| pjsip_tx_data_dec_ref( tsx->last_tx ); |
| tsx->last_tx = NULL; |
| } |
| /* Cancel timeout timer. */ |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| |
| /* Cancel retransmission timer. */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* Clear some pending flags. */ |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED | TSX_HAS_PENDING_SEND); |
| |
| |
| /* Refuse to destroy transaction if it has pending resolving. */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_DESTROY; |
| tsx->tsx_user = NULL; |
| PJ_LOG(4,(tsx->obj_name, "Will destroy later because transport is " |
| "in progress")); |
| } |
| |
| if (!tsx->terminating) { |
| tsx->terminating = PJ_TRUE; |
| pj_grp_lock_dec_ref(tsx->grp_lock); |
| } |
| |
| /* No acccess to tsx after this, it may have been destroyed */ |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Callback when timer expires. Transport error also piggybacks this event |
| * to avoid deadlock (https://trac.pjsip.org/repos/ticket/1646). |
| */ |
| static void tsx_timer_callback( pj_timer_heap_t *theap, pj_timer_entry *entry) |
| { |
| pjsip_transaction *tsx = (pjsip_transaction*) entry->user_data; |
| |
| PJ_UNUSED_ARG(theap); |
| |
| if (entry->id == TRANSPORT_ERR_TIMER) { |
| /* Posted transport error event */ |
| entry->id = 0; |
| if (tsx->state < PJSIP_TSX_STATE_TERMINATED) { |
| pjsip_tsx_state_e prev_state; |
| |
| pj_grp_lock_acquire(tsx->grp_lock); |
| prev_state = tsx->state; |
| |
| /* Release transport as it's no longer working. */ |
| tsx_update_transport(tsx, NULL); |
| |
| if (tsx->status_code < 200) { |
| pj_str_t err; |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| |
| err = pj_strerror(tsx->transport_err, errmsg, sizeof(errmsg)); |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TRANSPORT_ERROR, &err); |
| } |
| |
| /* Set transaction state etc, but don't notify TU now, |
| * otherwise we'll get a deadlock. See: |
| * https://trac.pjsip.org/repos/ticket/1646 |
| */ |
| tsx_set_state_no_notify( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TRANSPORT_ERROR, NULL); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| /* Now notify TU about state change, WITHOUT holding the |
| * group lock. It should be safe to do so; transaction will |
| * not get destroyed because group lock reference counter |
| * has been incremented by the timer heap. |
| */ |
| if (tsx->tsx_user && tsx->tsx_user->on_tsx_state) { |
| pjsip_event e; |
| PJSIP_EVENT_INIT_TSX_STATE(e, tsx, |
| PJSIP_EVENT_TRANSPORT_ERROR, NULL, |
| prev_state); |
| (*tsx->tsx_user->on_tsx_state)(tsx, &e); |
| } |
| } |
| } else { |
| pjsip_event event; |
| |
| entry->id = 0; |
| |
| PJ_LOG(5,(tsx->obj_name, "%s timer event", |
| (entry==&tsx->retransmit_timer ? "Retransmit":"Timeout"))); |
| pj_log_push_indent(); |
| |
| |
| PJSIP_EVENT_INIT_TIMER(event, entry); |
| |
| /* Dispatch event to transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| (*tsx->state_handler)(tsx, &event); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_pop_indent(); |
| } |
| } |
| |
| |
| /* |
| * Set transaction state, and inform TU about the transaction state change. |
| */ |
| static void tsx_set_state( pjsip_transaction *tsx, |
| pjsip_tsx_state_e state, |
| pjsip_event_id_e event_src_type, |
| void *event_src ) |
| { |
| pjsip_tsx_state_e prev_state = tsx->state; |
| |
| /* New state must be greater than previous state */ |
| pj_assert(state >= tsx->state); |
| |
| PJ_LOG(5, (tsx->obj_name, "State changed from %s to %s, event=%s", |
| state_str[tsx->state], state_str[state], |
| pjsip_event_str(event_src_type))); |
| pj_log_push_indent(); |
| |
| /* Change state. */ |
| tsx->state = state; |
| |
| /* Update the state handlers. */ |
| if (tsx->role == PJSIP_ROLE_UAC) { |
| tsx->state_handler = tsx_state_handler_uac[state]; |
| } else { |
| tsx->state_handler = tsx_state_handler_uas[state]; |
| } |
| |
| /* Before informing TU about state changed, inform TU about |
| * rx event. |
| */ |
| if (event_src_type==PJSIP_EVENT_RX_MSG && tsx->tsx_user) { |
| pjsip_rx_data *rdata = (pjsip_rx_data*) event_src; |
| |
| pj_assert(rdata != NULL); |
| |
| if (rdata->msg_info.msg->type == PJSIP_RESPONSE_MSG && |
| tsx->tsx_user->on_rx_response) |
| { |
| (*tsx->tsx_user->on_rx_response)(rdata); |
| } |
| |
| } |
| |
| /* Inform TU about state changed. */ |
| if (tsx->tsx_user && tsx->tsx_user->on_tsx_state) { |
| pjsip_event e; |
| PJSIP_EVENT_INIT_TSX_STATE(e, tsx, event_src_type, event_src, |
| prev_state); |
| (*tsx->tsx_user->on_tsx_state)(tsx, &e); |
| } |
| |
| |
| /* When the transaction is terminated, release transport, and free the |
| * saved last transmitted message. |
| */ |
| if (state == PJSIP_TSX_STATE_TERMINATED) { |
| pj_time_val timeout = {0, 0}; |
| |
| /* If we're still waiting for a message to be sent.. */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| /* Disassociate ourselves from the outstanding transmit data |
| * so that when the send callback is called we will be able |
| * to ignore that (otherwise we'll get assertion, see |
| * http://trac.pjsip.org/repos/ticket/1033) |
| */ |
| if (tsx->pending_tx) { |
| tsx->pending_tx->mod_data[mod_tsx_layer.mod.id] = NULL; |
| tsx->pending_tx = NULL; |
| } |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| } |
| |
| lock_timer(tsx); |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| } else if (state == PJSIP_TSX_STATE_DESTROYED) { |
| |
| /* Unregister transaction. */ |
| mod_tsx_layer_unregister_tsx(tsx); |
| |
| /* Destroy transaction. */ |
| tsx_shutdown(tsx); |
| } |
| |
| pj_log_pop_indent(); |
| } |
| |
| /* Set transaction state without notifying tsx_user */ |
| static void tsx_set_state_no_notify( pjsip_transaction *tsx, |
| pjsip_tsx_state_e state, |
| pjsip_event_id_e event_src_type, |
| void *event_src ) |
| { |
| pjsip_module *tsx_user = tsx->tsx_user; |
| tsx->tsx_user = NULL; |
| tsx_set_state(tsx, state, event_src_type, event_src); |
| tsx->tsx_user = tsx_user; |
| } |
| |
| /* |
| * Create, initialize, and register UAC transaction. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_create_uac( pjsip_module *tsx_user, |
| pjsip_tx_data *tdata, |
| pjsip_transaction **p_tsx) |
| { |
| return pjsip_tsx_create_uac2(tsx_user, tdata, NULL, p_tsx); |
| } |
| |
| PJ_DEF(pj_status_t) pjsip_tsx_create_uac2(pjsip_module *tsx_user, |
| pjsip_tx_data *tdata, |
| pj_grp_lock_t *grp_lock, |
| pjsip_transaction **p_tsx) |
| { |
| pjsip_transaction *tsx; |
| pjsip_msg *msg; |
| pjsip_cseq_hdr *cseq; |
| pjsip_via_hdr *via; |
| pjsip_host_info dst_info; |
| pj_status_t status; |
| |
| /* Validate arguments. */ |
| PJ_ASSERT_RETURN(tdata && tdata->msg && p_tsx, PJ_EINVAL); |
| PJ_ASSERT_RETURN(tdata->msg->type == PJSIP_REQUEST_MSG, |
| PJSIP_ENOTREQUESTMSG); |
| |
| /* Method MUST NOT be ACK! */ |
| PJ_ASSERT_RETURN(tdata->msg->line.req.method.id != PJSIP_ACK_METHOD, |
| PJ_EINVALIDOP); |
| |
| /* Keep shortcut */ |
| msg = tdata->msg; |
| |
| /* Make sure CSeq header is present. */ |
| cseq = (pjsip_cseq_hdr*) pjsip_msg_find_hdr(msg, PJSIP_H_CSEQ, NULL); |
| if (!cseq) { |
| pj_assert(!"CSeq header not present in outgoing message!"); |
| return PJSIP_EMISSINGHDR; |
| } |
| |
| |
| /* Create transaction instance. */ |
| status = tsx_create( tsx_user, grp_lock, &tsx); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| |
| /* Lock transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| /* Role is UAC. */ |
| tsx->role = PJSIP_ROLE_UAC; |
| |
| /* Save method. */ |
| pjsip_method_copy( tsx->pool, &tsx->method, &msg->line.req.method); |
| |
| /* Save CSeq. */ |
| tsx->cseq = cseq->cseq; |
| |
| /* Generate Via header if it doesn't exist. */ |
| via = (pjsip_via_hdr*) pjsip_msg_find_hdr(msg, PJSIP_H_VIA, NULL); |
| if (via == NULL) { |
| via = pjsip_via_hdr_create(tdata->pool); |
| pjsip_msg_insert_first_hdr(msg, (pjsip_hdr*) via); |
| } |
| |
| /* Generate branch parameter if it doesn't exist. */ |
| if (via->branch_param.slen == 0) { |
| pj_str_t tmp; |
| via->branch_param.ptr = (char*) |
| pj_pool_alloc(tsx->pool, PJSIP_MAX_BRANCH_LEN); |
| via->branch_param.slen = PJSIP_MAX_BRANCH_LEN; |
| pj_memcpy(via->branch_param.ptr, PJSIP_RFC3261_BRANCH_ID, |
| PJSIP_RFC3261_BRANCH_LEN); |
| tmp.ptr = via->branch_param.ptr + PJSIP_RFC3261_BRANCH_LEN + 2; |
| *(tmp.ptr-2) = 80; *(tmp.ptr-1) = 106; |
| pj_generate_unique_string( &tmp ); |
| |
| /* Save branch parameter. */ |
| tsx->branch = via->branch_param; |
| |
| } else { |
| /* Copy branch parameter. */ |
| pj_strdup(tsx->pool, &tsx->branch, &via->branch_param); |
| } |
| |
| /* Generate transaction key. */ |
| create_tsx_key_3261( tsx->pool, &tsx->transaction_key, |
| PJSIP_ROLE_UAC, &tsx->method, |
| &via->branch_param); |
| |
| /* Calculate hashed key value. */ |
| #ifdef PRECALC_HASH |
| tsx->hashed_key = pj_hash_calc_tolower(0, NULL, &tsx->transaction_key); |
| #endif |
| |
| PJ_LOG(6, (tsx->obj_name, "tsx_key=%.*s", tsx->transaction_key.slen, |
| tsx->transaction_key.ptr)); |
| |
| /* Begin with State_Null. |
| * Manually set-up the state becase we don't want to call the callback. |
| */ |
| tsx->state = PJSIP_TSX_STATE_NULL; |
| tsx->state_handler = &tsx_on_state_null; |
| |
| /* Save the message. */ |
| tsx->last_tx = tdata; |
| pjsip_tx_data_add_ref(tsx->last_tx); |
| |
| /* Determine whether reliable transport should be used initially. |
| * This will be updated whenever transport has changed. |
| */ |
| status = pjsip_get_request_dest(tdata, &dst_info); |
| if (status != PJ_SUCCESS) { |
| pj_grp_lock_release(tsx->grp_lock); |
| tsx_shutdown(tsx); |
| return status; |
| } |
| tsx->is_reliable = (dst_info.flag & PJSIP_TRANSPORT_RELIABLE); |
| |
| /* Register transaction to hash table. */ |
| status = mod_tsx_layer_register_tsx(tsx); |
| if (status != PJ_SUCCESS) { |
| /* The assertion is removed by #1090: |
| pj_assert(!"Bug in branch_param generator (i.e. not unique)"); |
| */ |
| pj_grp_lock_release(tsx->grp_lock); |
| tsx_shutdown(tsx); |
| return status; |
| } |
| |
| |
| /* Unlock transaction and return. */ |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_push_indent(); |
| PJ_LOG(5,(tsx->obj_name, "Transaction created for %s", |
| pjsip_tx_data_get_info(tdata))); |
| pj_log_pop_indent(); |
| |
| *p_tsx = tsx; |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Create, initialize, and register UAS transaction. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_create_uas( pjsip_module *tsx_user, |
| pjsip_rx_data *rdata, |
| pjsip_transaction **p_tsx) |
| { |
| return pjsip_tsx_create_uas2(tsx_user, rdata, NULL, p_tsx); |
| } |
| |
| PJ_DEF(pj_status_t) pjsip_tsx_create_uas2(pjsip_module *tsx_user, |
| pjsip_rx_data *rdata, |
| pj_grp_lock_t *grp_lock, |
| pjsip_transaction **p_tsx) |
| { |
| pjsip_transaction *tsx; |
| pjsip_msg *msg; |
| pj_str_t *branch; |
| pjsip_cseq_hdr *cseq; |
| pj_status_t status; |
| |
| /* Validate arguments. */ |
| PJ_ASSERT_RETURN(rdata && rdata->msg_info.msg && p_tsx, PJ_EINVAL); |
| |
| /* Keep shortcut to message */ |
| msg = rdata->msg_info.msg; |
| |
| /* Make sure this is a request message. */ |
| PJ_ASSERT_RETURN(msg->type == PJSIP_REQUEST_MSG, PJSIP_ENOTREQUESTMSG); |
| |
| /* Make sure method is not ACK */ |
| PJ_ASSERT_RETURN(msg->line.req.method.id != PJSIP_ACK_METHOD, |
| PJ_EINVALIDOP); |
| |
| /* Make sure CSeq header is present. */ |
| cseq = rdata->msg_info.cseq; |
| if (!cseq) |
| return PJSIP_EMISSINGHDR; |
| |
| /* Make sure Via header is present. */ |
| if (rdata->msg_info.via == NULL) |
| return PJSIP_EMISSINGHDR; |
| |
| /* Check that method in CSeq header match request method. |
| * Reference: PROTOS #1922 |
| */ |
| if (pjsip_method_cmp(&msg->line.req.method, |
| &rdata->msg_info.cseq->method) != 0) |
| { |
| PJ_LOG(4,(THIS_FILE, "Error: CSeq header contains different " |
| "method than the request line")); |
| return PJSIP_EINVALIDHDR; |
| } |
| |
| /* |
| * Create transaction instance. |
| */ |
| status = tsx_create( tsx_user, grp_lock, &tsx); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| |
| /* Lock transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| /* Role is UAS */ |
| tsx->role = PJSIP_ROLE_UAS; |
| |
| /* Save method. */ |
| pjsip_method_copy( tsx->pool, &tsx->method, &msg->line.req.method); |
| |
| /* Save CSeq */ |
| tsx->cseq = cseq->cseq; |
| |
| /* Get transaction key either from branch for RFC3261 message, or |
| * create transaction key. |
| */ |
| status = pjsip_tsx_create_key(tsx->pool, &tsx->transaction_key, |
| PJSIP_ROLE_UAS, &tsx->method, rdata); |
| if (status != PJ_SUCCESS) { |
| pj_grp_lock_release(tsx->grp_lock); |
| tsx_shutdown(tsx); |
| return status; |
| } |
| |
| /* Calculate hashed key value. */ |
| #ifdef PRECALC_HASH |
| tsx->hashed_key = pj_hash_calc_tolower(0, NULL, &tsx->transaction_key); |
| #endif |
| |
| /* Duplicate branch parameter for transaction. */ |
| branch = &rdata->msg_info.via->branch_param; |
| pj_strdup(tsx->pool, &tsx->branch, branch); |
| |
| PJ_LOG(6, (tsx->obj_name, "tsx_key=%.*s", tsx->transaction_key.slen, |
| tsx->transaction_key.ptr)); |
| |
| |
| /* Begin with state NULL. |
| * Manually set-up the state becase we don't want to call the callback. |
| */ |
| tsx->state = PJSIP_TSX_STATE_NULL; |
| tsx->state_handler = &tsx_on_state_null; |
| |
| /* Get response address. */ |
| status = pjsip_get_response_addr( tsx->pool, rdata, &tsx->res_addr ); |
| if (status != PJ_SUCCESS) { |
| pj_grp_lock_release(tsx->grp_lock); |
| tsx_shutdown(tsx); |
| return status; |
| } |
| |
| /* If it's decided that we should use current transport, keep the |
| * transport. |
| */ |
| if (tsx->res_addr.transport) { |
| tsx_update_transport(tsx, tsx->res_addr.transport); |
| pj_memcpy(&tsx->addr, &tsx->res_addr.addr, tsx->res_addr.addr_len); |
| tsx->addr_len = tsx->res_addr.addr_len; |
| tsx->is_reliable = PJSIP_TRANSPORT_IS_RELIABLE(tsx->transport); |
| } else { |
| tsx->is_reliable = |
| (tsx->res_addr.dst_host.flag & PJSIP_TRANSPORT_RELIABLE); |
| } |
| |
| |
| /* Register the transaction. */ |
| status = mod_tsx_layer_register_tsx(tsx); |
| if (status != PJ_SUCCESS) { |
| pj_grp_lock_release(tsx->grp_lock); |
| tsx_shutdown(tsx); |
| return status; |
| } |
| |
| /* Put this transaction in rdata's mod_data. */ |
| rdata->endpt_info.mod_data[mod_tsx_layer.mod.id] = tsx; |
| |
| /* Unlock transaction and return. */ |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_push_indent(); |
| PJ_LOG(5,(tsx->obj_name, "Transaction created for %s", |
| pjsip_rx_data_get_info(rdata))); |
| pj_log_pop_indent(); |
| |
| |
| *p_tsx = tsx; |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Bind transaction to a specific transport/listener. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_set_transport(pjsip_transaction *tsx, |
| const pjsip_tpselector *sel) |
| { |
| /* Must be UAC transaction */ |
| PJ_ASSERT_RETURN(tsx && sel, PJ_EINVAL); |
| |
| /* Start locking the transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| /* Decrement reference counter of previous transport selector */ |
| pjsip_tpselector_dec_ref(&tsx->tp_sel); |
| |
| /* Copy transport selector structure .*/ |
| pj_memcpy(&tsx->tp_sel, sel, sizeof(*sel)); |
| |
| /* Increment reference counter */ |
| pjsip_tpselector_add_ref(&tsx->tp_sel); |
| |
| /* Unlock transaction. */ |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Set transaction status code and reason. |
| */ |
| static void tsx_set_status_code(pjsip_transaction *tsx, |
| int code, const pj_str_t *reason) |
| { |
| tsx->status_code = code; |
| if (reason) |
| pj_strdup(tsx->pool, &tsx->status_text, reason); |
| else |
| tsx->status_text = *pjsip_get_status_text(code); |
| } |
| |
| |
| /* |
| * Forcely terminate transaction. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_terminate( pjsip_transaction *tsx, int code ) |
| { |
| PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| |
| PJ_LOG(5,(tsx->obj_name, "Request to terminate transaction")); |
| |
| PJ_ASSERT_RETURN(code >= 200, PJ_EINVAL); |
| |
| if (tsx->state >= PJSIP_TSX_STATE_TERMINATED) |
| return PJ_SUCCESS; |
| |
| pj_log_push_indent(); |
| |
| pj_grp_lock_acquire(tsx->grp_lock); |
| tsx_set_status_code(tsx, code, NULL); |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, PJSIP_EVENT_USER, NULL); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_pop_indent(); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Cease retransmission on the UAC transaction. The UAC transaction is |
| * still considered running, and it will complete when either final |
| * response is received or the transaction times out. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_stop_retransmit(pjsip_transaction *tsx) |
| { |
| PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| PJ_ASSERT_RETURN(tsx->role == PJSIP_ROLE_UAC && |
| tsx->method.id == PJSIP_INVITE_METHOD, |
| PJ_EINVALIDOP); |
| |
| PJ_LOG(5,(tsx->obj_name, "Request to stop retransmission")); |
| |
| pj_log_push_indent(); |
| |
| pj_grp_lock_acquire(tsx->grp_lock); |
| /* Cancel retransmission timer. */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_pop_indent(); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Start a timer to terminate transaction after the specified time |
| * has elapsed. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_set_timeout( pjsip_transaction *tsx, |
| unsigned millisec) |
| { |
| pj_time_val timeout; |
| |
| PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| PJ_ASSERT_RETURN(tsx->role == PJSIP_ROLE_UAC && |
| tsx->method.id == PJSIP_INVITE_METHOD, |
| PJ_EINVALIDOP); |
| |
| /* Note: must not call pj_grp_lock_acquire(tsx->grp_lock) as |
| * that would introduce deadlock. See #1121. |
| */ |
| lock_timer(tsx); |
| |
| /* Transaction should normally not have final response, but as |
| * #1121 says there is a (tolerable) window of race condition |
| * where this might happen. |
| */ |
| if (tsx->status_code >= 200 && tsx->timeout_timer.id != 0) { |
| /* Timeout is already set */ |
| unlock_timer(tsx); |
| return PJ_EEXISTS; |
| } |
| |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| |
| timeout.sec = 0; |
| timeout.msec = millisec; |
| pj_time_val_normalize(&timeout); |
| |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| |
| unlock_timer(tsx); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * This function is called by TU to send a message. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_send_msg( pjsip_transaction *tsx, |
| pjsip_tx_data *tdata ) |
| { |
| pjsip_event event; |
| pj_status_t status; |
| |
| if (tdata == NULL) |
| tdata = tsx->last_tx; |
| |
| PJ_ASSERT_RETURN(tdata != NULL, PJ_EINVALIDOP); |
| |
| PJ_LOG(5,(tsx->obj_name, "Sending %s in state %s", |
| pjsip_tx_data_get_info(tdata), |
| state_str[tsx->state])); |
| pj_log_push_indent(); |
| |
| PJSIP_EVENT_INIT_TX_MSG(event, tdata); |
| |
| /* Dispatch to transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| /* Set transport selector to tdata */ |
| pjsip_tx_data_set_transport(tdata, &tsx->tp_sel); |
| |
| /* Dispatch to state handler */ |
| status = (*tsx->state_handler)(tsx, &event); |
| |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| /* Only decrement reference counter when it returns success. |
| * (This is the specification from the .PDF design document). |
| */ |
| if (status == PJ_SUCCESS) { |
| pjsip_tx_data_dec_ref(tdata); |
| } |
| |
| pj_log_pop_indent(); |
| |
| return status; |
| } |
| |
| |
| /* |
| * This function is called by endpoint when incoming message for the |
| * transaction is received. |
| */ |
| PJ_DEF(void) pjsip_tsx_recv_msg( pjsip_transaction *tsx, |
| pjsip_rx_data *rdata) |
| { |
| pjsip_event event; |
| |
| PJ_LOG(5,(tsx->obj_name, "Incoming %s in state %s", |
| pjsip_rx_data_get_info(rdata), state_str[tsx->state])); |
| pj_log_push_indent(); |
| |
| /* Put the transaction in the rdata's mod_data. */ |
| rdata->endpt_info.mod_data[mod_tsx_layer.mod.id] = tsx; |
| |
| /* Init event. */ |
| PJSIP_EVENT_INIT_RX_MSG(event, rdata); |
| |
| /* Dispatch to transaction. */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| (*tsx->state_handler)(tsx, &event); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| pj_log_pop_indent(); |
| } |
| |
| |
| /* Callback called by send message framework */ |
| static void send_msg_callback( pjsip_send_state *send_state, |
| pj_ssize_t sent, pj_bool_t *cont ) |
| { |
| pjsip_transaction *tsx = (pjsip_transaction*) send_state->token; |
| pjsip_tx_data *tdata = send_state->tdata; |
| |
| /* Check if transaction has cancelled itself from this transmit |
| * notification (https://trac.pjsip.org/repos/ticket/1033). |
| * Also check if the transaction layer itself may have been shutdown |
| * (https://trac.pjsip.org/repos/ticket/1535) |
| */ |
| if (mod_tsx_layer.mod.id < 0 || |
| tdata->mod_data[mod_tsx_layer.mod.id] == NULL) |
| { |
| *cont = PJ_FALSE; |
| return; |
| } |
| |
| pj_grp_lock_acquire(tsx->grp_lock); |
| |
| /* Reset */ |
| tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| tsx->pending_tx = NULL; |
| |
| if (sent > 0) { |
| /* Successfully sent! */ |
| pj_assert(send_state->cur_transport != NULL); |
| |
| if (tsx->transport != send_state->cur_transport) { |
| /* Update transport. */ |
| tsx_update_transport(tsx, send_state->cur_transport); |
| |
| /* Update remote address. */ |
| tsx->addr_len = tdata->dest_info.addr.entry[tdata->dest_info.cur_addr].addr_len; |
| pj_memcpy(&tsx->addr, |
| &tdata->dest_info.addr.entry[tdata->dest_info.cur_addr].addr, |
| tsx->addr_len); |
| |
| /* Update is_reliable flag. */ |
| tsx->is_reliable = PJSIP_TRANSPORT_IS_RELIABLE(tsx->transport); |
| } |
| |
| /* Clear pending transport flag. */ |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| |
| /* Mark that we have resolved the addresses. */ |
| tsx->transport_flag |= TSX_HAS_RESOLVED_SERVER; |
| |
| /* Pending destroy? */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_DESTROY) { |
| tsx_set_state( tsx, PJSIP_TSX_STATE_DESTROYED, |
| PJSIP_EVENT_UNKNOWN, NULL ); |
| pj_grp_lock_release(tsx->grp_lock); |
| return; |
| } |
| |
| /* Need to transmit a message? */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_SEND) { |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_SEND); |
| tsx_send_msg(tsx, tsx->last_tx); |
| } |
| |
| /* Need to reschedule retransmission? */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_RESCHED) { |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| |
| /* Only update when transport turns out to be unreliable. */ |
| if (!tsx->is_reliable) { |
| tsx_resched_retransmission(tsx); |
| } |
| } |
| |
| } else { |
| /* Failed to send! */ |
| pj_assert(sent != 0); |
| |
| /* If transaction is using the same transport as the failed one, |
| * release the transport. |
| */ |
| if (send_state->cur_transport==tsx->transport) |
| tsx_update_transport(tsx, NULL); |
| |
| /* Also stop processing if transaction has been flagged with |
| * pending destroy (http://trac.pjsip.org/repos/ticket/906) |
| */ |
| if ((!*cont) || (tsx->transport_flag & TSX_HAS_PENDING_DESTROY)) { |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| pjsip_status_code sc; |
| pj_str_t err; |
| |
| tsx->transport_err = (pj_status_t)-sent; |
| |
| err =pj_strerror((pj_status_t)-sent, errmsg, sizeof(errmsg)); |
| |
| PJ_LOG(2,(tsx->obj_name, |
| "Failed to send %s! err=%d (%s)", |
| pjsip_tx_data_get_info(send_state->tdata), -sent, |
| errmsg)); |
| |
| /* Clear pending transport flag. */ |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| |
| /* Mark that we have resolved the addresses. */ |
| tsx->transport_flag |= TSX_HAS_RESOLVED_SERVER; |
| |
| /* Server resolution error is now mapped to 502 instead of 503, |
| * since with 503 normally client should try again. |
| * See http://trac.pjsip.org/repos/ticket/870 |
| */ |
| if (-sent==PJ_ERESOLVE || -sent==PJLIB_UTIL_EDNS_NXDOMAIN) |
| sc = PJSIP_SC_BAD_GATEWAY; |
| else |
| sc = PJSIP_SC_TSX_TRANSPORT_ERROR; |
| |
| /* Terminate transaction, if it's not already terminated. */ |
| tsx_set_status_code(tsx, sc, &err); |
| if (tsx->state != PJSIP_TSX_STATE_TERMINATED && |
| tsx->state != PJSIP_TSX_STATE_DESTROYED) |
| { |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TRANSPORT_ERROR, send_state->tdata); |
| } |
| /* Don't forget to destroy if we have pending destroy flag |
| * (http://trac.pjsip.org/repos/ticket/906) |
| */ |
| else if (tsx->transport_flag & TSX_HAS_PENDING_DESTROY) |
| { |
| tsx_set_state( tsx, PJSIP_TSX_STATE_DESTROYED, |
| PJSIP_EVENT_TRANSPORT_ERROR, send_state->tdata); |
| } |
| |
| } else { |
| PJ_PERROR(2,(tsx->obj_name, (pj_status_t)-sent, |
| "Temporary failure in sending %s, " |
| "will try next server", |
| pjsip_tx_data_get_info(send_state->tdata))); |
| |
| /* Reset retransmission count */ |
| tsx->retransmit_count = 0; |
| |
| /* And reset timeout timer */ |
| if (tsx->timeout_timer.id) { |
| lock_timer(tsx); |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| &timeout_timer_val, TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| } |
| |
| /* Put again pending tdata */ |
| tdata->mod_data[mod_tsx_layer.mod.id] = tsx; |
| tsx->pending_tx = tdata; |
| } |
| } |
| |
| pj_grp_lock_release(tsx->grp_lock); |
| } |
| |
| |
| /* Transport callback. */ |
| static void transport_callback(void *token, pjsip_tx_data *tdata, |
| pj_ssize_t sent) |
| { |
| pjsip_transaction *tsx = (pjsip_transaction*) token; |
| |
| /* In other circumstances, locking tsx->grp_lock AFTER transport mutex |
| * will introduce deadlock if another thread is currently sending a |
| * SIP message to the transport. But this should be safe as there should |
| * be no way this callback could be called while another thread is |
| * sending a message. |
| */ |
| pj_grp_lock_acquire(tsx->grp_lock); |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| if (sent < 0) { |
| pj_time_val delay = {0, 0}; |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| |
| pj_strerror((pj_status_t)-sent, errmsg, sizeof(errmsg)); |
| |
| PJ_LOG(2,(tsx->obj_name, "Transport failed to send %s! Err=%d (%s)", |
| pjsip_tx_data_get_info(tdata), -sent, errmsg)); |
| |
| /* Post the event for later processing, to avoid deadlock. |
| * See https://trac.pjsip.org/repos/ticket/1646 |
| */ |
| lock_timer(tsx); |
| tsx->transport_err = (pj_status_t)-sent; |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay, |
| TRANSPORT_ERR_TIMER); |
| unlock_timer(tsx); |
| } |
| |
| /* Decrease pending send counter */ |
| pj_grp_lock_dec_ref(tsx->grp_lock); |
| } |
| |
| |
| /* |
| * Callback when transport state changes. |
| */ |
| static void tsx_tp_state_callback( pjsip_transport *tp, |
| pjsip_transport_state state, |
| const pjsip_transport_state_info *info) |
| { |
| PJ_UNUSED_ARG(tp); |
| |
| if (state == PJSIP_TP_STATE_DISCONNECTED) { |
| pjsip_transaction *tsx; |
| pj_time_val delay = {0, 0}; |
| |
| pj_assert(tp && info && info->user_data); |
| |
| tsx = (pjsip_transaction*)info->user_data; |
| |
| /* Post the event for later processing, to avoid deadlock. |
| * See https://trac.pjsip.org/repos/ticket/1646 |
| */ |
| lock_timer(tsx); |
| tsx->transport_err = info->status; |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay, |
| TRANSPORT_ERR_TIMER); |
| unlock_timer(tsx); |
| } |
| } |
| |
| |
| /* |
| * Send message to the transport. |
| */ |
| static pj_status_t tsx_send_msg( pjsip_transaction *tsx, |
| pjsip_tx_data *tdata) |
| { |
| pj_status_t status = PJ_SUCCESS; |
| |
| PJ_ASSERT_RETURN(tsx && tdata, PJ_EINVAL); |
| |
| /* Send later if transport is still pending. */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_SEND; |
| return PJ_SUCCESS; |
| } |
| |
| /* Skip send if previous tdata transmission is pending (see #1665). */ |
| if (tdata->is_pending) { |
| PJ_LOG(2,(THIS_FILE, "Unable to send %s: message is pending", |
| pjsip_tx_data_get_info(tdata))); |
| return PJ_SUCCESS; |
| } |
| |
| /* If we have the transport, send the message using that transport. |
| * Otherwise perform full transport resolution. |
| */ |
| if (tsx->transport) { |
| /* Increment group lock while waiting for send operation to complete, |
| * to prevent us from being destroyed prematurely. See |
| * https://trac.pjsip.org/repos/ticket/1646 |
| */ |
| pj_grp_lock_add_ref(tsx->grp_lock); |
| tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| |
| status = pjsip_transport_send( tsx->transport, tdata, &tsx->addr, |
| tsx->addr_len, tsx, |
| &transport_callback); |
| if (status == PJ_EPENDING) |
| status = PJ_SUCCESS; |
| else { |
| /* Operation completes immediately */ |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| pj_grp_lock_dec_ref(tsx->grp_lock); |
| } |
| |
| if (status != PJ_SUCCESS) { |
| PJ_PERROR(2,(tsx->obj_name, status, |
| "Error sending %s", |
| pjsip_tx_data_get_info(tdata))); |
| |
| /* On error, release transport to force using full transport |
| * resolution procedure. |
| */ |
| tsx_update_transport(tsx, NULL); |
| |
| tsx->addr_len = 0; |
| tsx->res_addr.transport = NULL; |
| tsx->res_addr.addr_len = 0; |
| } else { |
| return PJ_SUCCESS; |
| } |
| } |
| |
| /* We are here because we don't have transport, or we failed to send |
| * the message using existing transport. If we haven't resolved the |
| * server before, then begin the long process of resolving the server |
| * and send the message with possibly new server. |
| */ |
| pj_assert(status != PJ_SUCCESS || tsx->transport == NULL); |
| |
| /* If we have resolved the server, we treat the error as permanent error. |
| * Terminate transaction with transport error failure. |
| */ |
| if (tsx->transport_flag & TSX_HAS_RESOLVED_SERVER) { |
| |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| pj_str_t err; |
| |
| if (status == PJ_SUCCESS) { |
| pj_assert(!"Unexpected status!"); |
| status = PJ_EUNKNOWN; |
| } |
| |
| /* We have resolved the server!. |
| * Treat this as permanent transport error. |
| */ |
| err = pj_strerror(status, errmsg, sizeof(errmsg)); |
| |
| PJ_LOG(2,(tsx->obj_name, |
| "Transport error, terminating transaction. " |
| "Err=%d (%s)", |
| status, errmsg)); |
| |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TRANSPORT_ERROR, &err); |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TRANSPORT_ERROR, NULL ); |
| |
| return status; |
| } |
| |
| /* Must add reference counter because the send request functions |
| * decrement the reference counter. |
| */ |
| pjsip_tx_data_add_ref(tdata); |
| |
| /* Also attach ourselves to the transmit data so that we'll be able |
| * to unregister ourselves from the send notification of this |
| * transmit data. |
| */ |
| tdata->mod_data[mod_tsx_layer.mod.id] = tsx; |
| tsx->pending_tx = tdata; |
| |
| /* Begin resolving destination etc to send the message. */ |
| if (tdata->msg->type == PJSIP_REQUEST_MSG) { |
| |
| tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| status = pjsip_endpt_send_request_stateless(tsx->endpt, tdata, tsx, |
| &send_msg_callback); |
| if (status == PJ_EPENDING) |
| status = PJ_SUCCESS; |
| if (status != PJ_SUCCESS) { |
| pjsip_tx_data_dec_ref(tdata); |
| tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| tsx->pending_tx = NULL; |
| } |
| |
| /* Check if transaction is terminated. */ |
| if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TERMINATED) |
| status = tsx->transport_err; |
| |
| } else { |
| |
| tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| status = pjsip_endpt_send_response( tsx->endpt, &tsx->res_addr, |
| tdata, tsx, |
| &send_msg_callback); |
| if (status == PJ_EPENDING) |
| status = PJ_SUCCESS; |
| if (status != PJ_SUCCESS) { |
| pjsip_tx_data_dec_ref(tdata); |
| tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| tsx->pending_tx = NULL; |
| } |
| |
| /* Check if transaction is terminated. */ |
| if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TERMINATED) |
| status = tsx->transport_err; |
| |
| } |
| |
| |
| return status; |
| } |
| |
| |
| /* |
| * Manually retransmit the last messagewithout updating the transaction state. |
| */ |
| PJ_DEF(pj_status_t) pjsip_tsx_retransmit_no_state(pjsip_transaction *tsx, |
| pjsip_tx_data *tdata) |
| { |
| pj_status_t status; |
| |
| pj_grp_lock_acquire(tsx->grp_lock); |
| if (tdata == NULL) { |
| tdata = tsx->last_tx; |
| } |
| status = tsx_send_msg(tsx, tdata); |
| pj_grp_lock_release(tsx->grp_lock); |
| |
| /* Only decrement reference counter when it returns success. |
| * (This is the specification from the .PDF design document). |
| */ |
| if (status == PJ_SUCCESS) { |
| pjsip_tx_data_dec_ref(tdata); |
| } |
| |
| return status; |
| } |
| |
| |
| /* |
| * Retransmit last message sent. |
| */ |
| static void tsx_resched_retransmission( pjsip_transaction *tsx ) |
| { |
| pj_uint32_t msec_time; |
| |
| pj_assert((tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) == 0); |
| |
| if (tsx->role==PJSIP_ROLE_UAC && tsx->status_code >= 100) |
| msec_time = pjsip_cfg()->tsx.t2; |
| else |
| msec_time = (1 << (tsx->retransmit_count)) * pjsip_cfg()->tsx.t1; |
| |
| if (tsx->role == PJSIP_ROLE_UAC) { |
| pj_assert(tsx->status_code < 200); |
| /* Retransmission for non-INVITE transaction caps-off at T2 */ |
| if (msec_time > pjsip_cfg()->tsx.t2 && |
| tsx->method.id != PJSIP_INVITE_METHOD) |
| { |
| msec_time = pjsip_cfg()->tsx.t2; |
| } |
| } else { |
| /* For UAS, this can be retransmission of 2xx response for INVITE |
| * or non-100 1xx response. |
| */ |
| if (tsx->status_code < 200) { |
| /* non-100 1xx retransmission is at 60 seconds */ |
| msec_time = PJSIP_TSX_1XX_RETRANS_DELAY * 1000; |
| } else { |
| /* Retransmission of INVITE final response also caps-off at T2 */ |
| pj_assert(tsx->status_code >= 200); |
| if (msec_time > pjsip_cfg()->tsx.t2) |
| msec_time = pjsip_cfg()->tsx.t2; |
| } |
| } |
| |
| if (msec_time != 0) { |
| pj_time_val timeout; |
| |
| timeout.sec = msec_time / 1000; |
| timeout.msec = msec_time % 1000; |
| tsx_schedule_timer( tsx, &tsx->retransmit_timer, &timeout, |
| RETRANSMIT_TIMER); |
| } |
| } |
| |
| /* |
| * Retransmit last message sent. |
| */ |
| static pj_status_t tsx_retransmit( pjsip_transaction *tsx, int resched) |
| { |
| pj_status_t status; |
| |
| PJ_ASSERT_RETURN(tsx->last_tx!=NULL, PJ_EBUG); |
| |
| PJ_LOG(5,(tsx->obj_name, "Retransmiting %s, count=%d, restart?=%d", |
| pjsip_tx_data_get_info(tsx->last_tx), |
| tsx->retransmit_count, resched)); |
| |
| ++tsx->retransmit_count; |
| |
| /* Restart timer T1 first before sending the message to ensure that |
| * retransmission timer is not engaged when loop transport is used. |
| */ |
| if (resched) { |
| pj_assert(tsx->state != PJSIP_TSX_STATE_CONFIRMED); |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| } else { |
| tsx_resched_retransmission(tsx); |
| } |
| } |
| |
| status = tsx_send_msg( tsx, tsx->last_tx); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| static void tsx_update_transport( pjsip_transaction *tsx, |
| pjsip_transport *tp) |
| { |
| pj_assert(tsx); |
| |
| if (tsx->transport) { |
| pjsip_transport_remove_state_listener(tsx->transport, |
| tsx->tp_st_key, tsx); |
| pjsip_transport_dec_ref( tsx->transport ); |
| tsx->transport = NULL; |
| } |
| |
| if (tp) { |
| tsx->transport = tp; |
| pjsip_transport_add_ref(tp); |
| pjsip_transport_add_state_listener(tp, &tsx_tp_state_callback, tsx, |
| &tsx->tp_st_key); |
| if (tp->is_shutdown) { |
| pjsip_transport_state_info info; |
| |
| pj_bzero(&info, sizeof(info)); |
| info.user_data = tsx; |
| info.status = PJSIP_SC_TSX_TRANSPORT_ERROR; |
| tsx_tp_state_callback(tp, PJSIP_TP_STATE_DISCONNECTED, &info); |
| } |
| } |
| } |
| |
| /* |
| * Handler for events in state Null. |
| */ |
| static pj_status_t tsx_on_state_null( pjsip_transaction *tsx, |
| pjsip_event *event ) |
| { |
| pj_status_t status; |
| |
| pj_assert(tsx->state == PJSIP_TSX_STATE_NULL); |
| |
| if (tsx->role == PJSIP_ROLE_UAS) { |
| |
| /* Set state to Trying. */ |
| pj_assert(event->type == PJSIP_EVENT_RX_MSG && |
| event->body.rx_msg.rdata->msg_info.msg->type == |
| PJSIP_REQUEST_MSG); |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TRYING, PJSIP_EVENT_RX_MSG, |
| event->body.rx_msg.rdata); |
| |
| } else { |
| pjsip_tx_data *tdata; |
| |
| /* Must be transmit event. |
| * You may got this assertion when using loop transport with delay |
| * set to zero. That would cause on_rx_response() callback to be |
| * called before tsx_send_msg() has completed. |
| */ |
| PJ_ASSERT_RETURN(event->type == PJSIP_EVENT_TX_MSG, PJ_EBUG); |
| |
| /* Get the txdata */ |
| tdata = event->body.tx_msg.tdata; |
| |
| /* Save the message for retransmission. */ |
| if (tsx->last_tx && tsx->last_tx != tdata) { |
| pjsip_tx_data_dec_ref(tsx->last_tx); |
| tsx->last_tx = NULL; |
| } |
| if (tsx->last_tx != tdata) { |
| tsx->last_tx = tdata; |
| pjsip_tx_data_add_ref(tdata); |
| } |
| |
| /* Send the message. */ |
| status = tsx_send_msg( tsx, tdata); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| /* Start Timer B (or called timer F for non-INVITE) for transaction |
| * timeout. |
| */ |
| lock_timer(tsx); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout_timer_val, |
| TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| /* Start Timer A (or timer E) for retransmission only if unreliable |
| * transport is being used. |
| */ |
| if (!tsx->is_reliable) { |
| tsx->retransmit_count = 0; |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| } else { |
| tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| &t1_timer_val, RETRANSMIT_TIMER); |
| } |
| } |
| |
| /* Move state. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_CALLING, |
| PJSIP_EVENT_TX_MSG, tdata); |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * State Calling is for UAC after it sends request but before any responses |
| * is received. |
| */ |
| static pj_status_t tsx_on_state_calling( pjsip_transaction *tsx, |
| pjsip_event *event ) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_CALLING); |
| pj_assert(tsx->role == PJSIP_ROLE_UAC); |
| |
| if (event->type == PJSIP_EVENT_TIMER && |
| event->body.timer.entry == &tsx->retransmit_timer) |
| { |
| pj_status_t status; |
| |
| /* Retransmit the request. */ |
| status = tsx_retransmit( tsx, 1 ); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| } else if (event->type == PJSIP_EVENT_TIMER && |
| event->body.timer.entry == &tsx->timeout_timer) |
| { |
| /* Cancel retransmission timer. */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| |
| /* Set status code */ |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| |
| /* Inform TU. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| |
| /* Transaction is destroyed */ |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else if (event->type == PJSIP_EVENT_RX_MSG) { |
| pjsip_msg *msg; |
| int code; |
| |
| /* Get message instance */ |
| msg = event->body.rx_msg.rdata->msg_info.msg; |
| |
| /* Better be a response message. */ |
| if (msg->type != PJSIP_RESPONSE_MSG) |
| return PJSIP_ENOTRESPONSEMSG; |
| |
| code = msg->line.status.code; |
| |
| /* If the response is final, cancel both retransmission and timeout |
| * timer. |
| */ |
| if (code >= 200) { |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| if (tsx->timeout_timer.id != 0) { |
| lock_timer(tsx); |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| unlock_timer(tsx); |
| } |
| |
| } else { |
| /* Cancel retransmit timer (for non-INVITE transaction, the |
| * retransmit timer will be rescheduled at T2. |
| */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* For provisional response, only cancel retransmit when this |
| * is an INVITE transaction. For non-INVITE, section 17.1.2.1 |
| * of RFC 3261 says that: |
| * - retransmit timer is set to T2 |
| * - timeout timer F is not deleted. |
| */ |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| |
| /* Cancel timeout timer */ |
| lock_timer(tsx); |
| tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| unlock_timer(tsx); |
| |
| } else { |
| if (!tsx->is_reliable) { |
| tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| &t2_timer_val, RETRANSMIT_TIMER); |
| } |
| } |
| } |
| |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| |
| |
| /* Discard retransmission message if it is not INVITE. |
| * The INVITE tdata is needed in case we have to generate ACK for |
| * the final response. |
| */ |
| /* Keep last_tx for authorization. */ |
| //blp: always keep last_tx until transaction is destroyed |
| //code = msg->line.status.code; |
| //if (tsx->method.id != PJSIP_INVITE_METHOD && code!=401 && code!=407) { |
| // pjsip_tx_data_dec_ref(tsx->last_tx); |
| // tsx->last_tx = NULL; |
| //} |
| |
| /* Processing is similar to state Proceeding. */ |
| tsx_on_state_proceeding_uac( tsx, event); |
| |
| } else { |
| pj_assert(!"Unexpected event"); |
| return PJ_EBUG; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * State Trying is for UAS after it received request but before any responses |
| * is sent. |
| * Note: this is different than RFC3261, which can use Trying state for |
| * non-INVITE client transaction (bug in RFC?). |
| */ |
| static pj_status_t tsx_on_state_trying( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_status_t status; |
| |
| pj_assert(tsx->state == PJSIP_TSX_STATE_TRYING); |
| |
| /* This state is only for UAS */ |
| pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| |
| /* Better be transmission of response message. |
| * If we've got request retransmission, this means that the TU hasn't |
| * transmitted any responses within 500 ms, which is not allowed. If |
| * this happens, just ignore the event (we couldn't retransmit last |
| * response because we haven't sent any!). |
| */ |
| if (event->type != PJSIP_EVENT_TX_MSG) { |
| return PJ_SUCCESS; |
| } |
| |
| /* The rest of the processing of the event is exactly the same as in |
| * "Proceeding" state. |
| */ |
| status = tsx_on_state_proceeding_uas( tsx, event); |
| |
| /* Inform the TU of the state transision if state is still State_Trying */ |
| if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TRYING) { |
| |
| tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| PJSIP_EVENT_TX_MSG, event->body.tx_msg.tdata); |
| |
| } |
| |
| return status; |
| } |
| |
| |
| /* |
| * Handler for events in Proceeding for UAS |
| * This state happens after the TU sends provisional response. |
| */ |
| static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_PROCEEDING || |
| tsx->state == PJSIP_TSX_STATE_TRYING); |
| |
| /* This state is only for UAS. */ |
| pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| |
| /* Receive request retransmission. */ |
| if (event->type == PJSIP_EVENT_RX_MSG) { |
| |
| pj_status_t status; |
| |
| /* Must have last response sent. */ |
| PJ_ASSERT_RETURN(tsx->last_tx != NULL, PJ_EBUG); |
| |
| /* Send last response */ |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_SEND; |
| } else { |
| status = tsx_send_msg(tsx, tsx->last_tx); |
| if (status != PJ_SUCCESS) |
| return status; |
| } |
| |
| } else if (event->type == PJSIP_EVENT_TX_MSG ) { |
| pjsip_tx_data *tdata = event->body.tx_msg.tdata; |
| pj_status_t status; |
| |
| /* The TU sends response message to the request. Save this message so |
| * that we can retransmit the last response in case we receive request |
| * retransmission. |
| */ |
| pjsip_msg *msg = tdata->msg; |
| |
| /* This can only be a response message. */ |
| PJ_ASSERT_RETURN(msg->type==PJSIP_RESPONSE_MSG, PJSIP_ENOTRESPONSEMSG); |
| |
| /* Update last status */ |
| tsx_set_status_code(tsx, msg->line.status.code, |
| &msg->line.status.reason); |
| |
| /* Discard the saved last response (it will be updated later as |
| * necessary). |
| */ |
| if (tsx->last_tx && tsx->last_tx != tdata) { |
| pjsip_tx_data_dec_ref( tsx->last_tx ); |
| tsx->last_tx = NULL; |
| } |
| |
| /* Send the message. */ |
| status = tsx_send_msg(tsx, tdata); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| // Update To tag header for RFC2543 transaction. |
| // TODO: |
| |
| /* Update transaction state */ |
| if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 100)) { |
| |
| if (tsx->last_tx != tdata) { |
| tsx->last_tx = tdata; |
| pjsip_tx_data_add_ref( tdata ); |
| } |
| |
| tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| PJSIP_EVENT_TX_MSG, tdata ); |
| |
| /* Retransmit provisional response every 1 minute if this is |
| * an INVITE provisional response greater than 100. |
| */ |
| if (PJSIP_TSX_1XX_RETRANS_DELAY > 0 && |
| tsx->method.id==PJSIP_INVITE_METHOD && tsx->status_code>100) |
| { |
| |
| /* Stop 1xx retransmission timer, if any */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* Schedule retransmission */ |
| tsx->retransmit_count = 0; |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| } else { |
| pj_time_val delay = {PJSIP_TSX_1XX_RETRANS_DELAY, 0}; |
| tsx_schedule_timer( tsx, &tsx->retransmit_timer, &delay, |
| RETRANSMIT_TIMER); |
| } |
| } |
| |
| } else if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 200)) { |
| |
| /* Stop 1xx retransmission timer, if any */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| if (tsx->method.id == PJSIP_INVITE_METHOD && tsx->handle_200resp==0) { |
| |
| /* 2xx class message is not saved, because retransmission |
| * is handled by TU. |
| */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TX_MSG, tdata ); |
| |
| /* Transaction is destroyed. */ |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else { |
| pj_time_val timeout; |
| |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| tsx->retransmit_count = 0; |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| } else { |
| tsx_schedule_timer( tsx, &tsx->retransmit_timer, |
| &t1_timer_val, RETRANSMIT_TIMER); |
| } |
| } |
| |
| /* Save last response sent for retransmission when request |
| * retransmission is received. |
| */ |
| if (tsx->last_tx != tdata) { |
| tsx->last_tx = tdata; |
| pjsip_tx_data_add_ref(tdata); |
| } |
| |
| /* Setup timeout timer: */ |
| |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| |
| /* Start Timer H at 64*T1 for INVITE server transaction, |
| * regardless of transport. |
| */ |
| timeout = timeout_timer_val; |
| |
| } else if (!tsx->is_reliable) { |
| |
| /* For non-INVITE, start timer J at 64*T1 for unreliable |
| * transport. |
| */ |
| timeout = timeout_timer_val; |
| |
| } else { |
| |
| /* Transaction terminates immediately for non-INVITE when |
| * reliable transport is used. |
| */ |
| timeout.sec = timeout.msec = 0; |
| } |
| |
| lock_timer(tsx); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| &timeout, TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| /* Set state to "Completed" */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| PJSIP_EVENT_TX_MSG, tdata ); |
| } |
| |
| } else if (tsx->status_code >= 300) { |
| |
| /* Stop 1xx retransmission timer, if any */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* 3xx-6xx class message causes transaction to move to |
| * "Completed" state. |
| */ |
| if (tsx->last_tx != tdata) { |
| tsx->last_tx = tdata; |
| pjsip_tx_data_add_ref( tdata ); |
| } |
| |
| /* For INVITE, start timer H for transaction termination |
| * regardless whether transport is reliable or not. |
| * For non-INVITE, start timer J with the value of 64*T1 for |
| * non-reliable transports, and zero for reliable transports. |
| */ |
| lock_timer(tsx); |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| /* Start timer H for INVITE */ |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| &timeout_timer_val, TIMEOUT_TIMER); |
| } else if (!tsx->is_reliable) { |
| /* Start timer J on 64*T1 seconds for non-INVITE */ |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| &timeout_timer_val, TIMEOUT_TIMER); |
| } else { |
| /* Start timer J on zero seconds for non-INVITE */ |
| pj_time_val zero_time = { 0, 0 }; |
| tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| &zero_time, TIMEOUT_TIMER); |
| } |
| unlock_timer(tsx); |
| |
| /* For INVITE, if unreliable transport is used, retransmission |
| * timer G will be scheduled (retransmission). |
| */ |
| if (!tsx->is_reliable) { |
| pjsip_cseq_hdr *cseq = (pjsip_cseq_hdr*) |
| pjsip_msg_find_hdr( msg, PJSIP_H_CSEQ, |
| NULL); |
| if (cseq->method.id == PJSIP_INVITE_METHOD) { |
| tsx->retransmit_count = 0; |
| if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| } else { |
| tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| &t1_timer_val, RETRANSMIT_TIMER); |
| } |
| } |
| } |
| |
| /* Inform TU */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| PJSIP_EVENT_TX_MSG, tdata ); |
| |
| } else { |
| pj_assert(0); |
| } |
| |
| |
| } else if (event->type == PJSIP_EVENT_TIMER && |
| event->body.timer.entry == &tsx->retransmit_timer) { |
| |
| /* Retransmission timer elapsed. */ |
| pj_status_t status; |
| |
| /* Must not be triggered while transport is pending. */ |
| pj_assert((tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) == 0); |
| |
| /* Must have last response to retransmit. */ |
| pj_assert(tsx->last_tx != NULL); |
| |
| /* Retransmit the last response. */ |
| status = tsx_retransmit( tsx, 1 ); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| } else if (event->type == PJSIP_EVENT_TIMER && |
| event->body.timer.entry == &tsx->timeout_timer) { |
| |
| /* Timeout timer. should not happen? */ |
| pj_assert(!"Should not happen(?)"); |
| |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| |
| return PJ_EBUG; |
| |
| } else { |
| pj_assert(!"Unexpected event"); |
| return PJ_EBUG; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in Proceeding for UAC |
| * This state happens after provisional response(s) has been received from |
| * UAS. |
| */ |
| static pj_status_t tsx_on_state_proceeding_uac(pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| |
| pj_assert(tsx->state == PJSIP_TSX_STATE_PROCEEDING || |
| tsx->state == PJSIP_TSX_STATE_CALLING); |
| |
| if (event->type != PJSIP_EVENT_TIMER) { |
| pjsip_msg *msg; |
| |
| /* Must be incoming response, because we should not retransmit |
| * request once response has been received. |
| */ |
| pj_assert(event->type == PJSIP_EVENT_RX_MSG); |
| if (event->type != PJSIP_EVENT_RX_MSG) { |
| return PJ_EINVALIDOP; |
| } |
| |
| msg = event->body.rx_msg.rdata->msg_info.msg; |
| |
| /* Must be a response message. */ |
| if (msg->type != PJSIP_RESPONSE_MSG) { |
| pj_assert(!"Expecting response message!"); |
| return PJSIP_ENOTRESPONSEMSG; |
| } |
| |
| tsx_set_status_code(tsx, msg->line.status.code, |
| &msg->line.status.reason); |
| |
| } else { |
| if (event->body.timer.entry == &tsx->retransmit_timer) { |
| /* Retransmit message. */ |
| pj_status_t status; |
| |
| status = tsx_retransmit( tsx, 1 ); |
| |
| return status; |
| |
| } else { |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| } |
| } |
| |
| if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 100)) { |
| |
| /* Inform the message to TU. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| |
| } else if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code,200)) { |
| |
| /* Stop timeout timer B/F. */ |
| lock_timer(tsx); |
| tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| unlock_timer(tsx); |
| |
| /* For INVITE, the state moves to Terminated state (because ACK is |
| * handled in TU). For non-INVITE, state moves to Completed. |
| */ |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else { |
| pj_time_val timeout; |
| |
| /* For unreliable transport, start timer D (for INVITE) or |
| * timer K for non-INVITE. */ |
| if (!tsx->is_reliable) { |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| timeout = td_timer_val; |
| } else { |
| timeout = t4_timer_val; |
| } |
| } else { |
| timeout.sec = timeout.msec = 0; |
| } |
| lock_timer(tsx); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| &timeout, TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| /* Cancel retransmission timer */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* Move state to Completed, inform TU. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| } |
| |
| } else if (event->type == PJSIP_EVENT_TIMER && |
| event->body.timer.entry == &tsx->timeout_timer) { |
| |
| /* Inform TU. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| |
| |
| } else if (tsx->status_code >= 300 && tsx->status_code <= 699) { |
| |
| |
| #if 0 |
| /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ |
| /* |
| * This is the old code; it's broken for authentication. |
| */ |
| pj_time_val timeout; |
| pj_status_t status; |
| |
| /* Stop timer B. */ |
| tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| |
| /* Generate and send ACK for INVITE. */ |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| pjsip_tx_data *ack; |
| |
| status = pjsip_endpt_create_ack( tsx->endpt, tsx->last_tx, |
| event->body.rx_msg.rdata, |
| &ack); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| if (ack != tsx->last_tx) { |
| pjsip_tx_data_dec_ref(tsx->last_tx); |
| tsx->last_tx = ack; |
| } |
| |
| status = tsx_send_msg( tsx, tsx->last_tx); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| } |
| |
| /* Start Timer D with TD/T4 timer if unreliable transport is used. */ |
| if (!tsx->is_reliable) { |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| timeout = td_timer_val; |
| } else { |
| timeout = t4_timer_val; |
| } |
| } else { |
| timeout.sec = timeout.msec = 0; |
| } |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| |
| /* Inform TU. |
| * blp: You might be tempted to move this notification before |
| * sending ACK, but I think you shouldn't. Better set-up |
| * everything before calling tsx_user's callback to avoid |
| * mess up. |
| */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| |
| /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ |
| #endif |
| |
| /* New code, taken from 0.2.9.x branch */ |
| pj_time_val timeout; |
| pjsip_tx_data *ack_tdata = NULL; |
| |
| /* Cancel retransmission timer */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| /* Stop timer B. */ |
| lock_timer(tsx); |
| tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| unlock_timer(tsx); |
| |
| /* Generate and send ACK (for INVITE) */ |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| pj_status_t status; |
| |
| status = pjsip_endpt_create_ack( tsx->endpt, tsx->last_tx, |
| event->body.rx_msg.rdata, |
| &ack_tdata); |
| if (status != PJ_SUCCESS) |
| return status; |
| |
| status = tsx_send_msg( tsx, ack_tdata); |
| if (status != PJ_SUCCESS) |
| return status; |
| } |
| |
| /* Inform TU. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata); |
| |
| /* Generate and send ACK for INVITE. */ |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| if (ack_tdata != tsx->last_tx) { |
| pjsip_tx_data_dec_ref(tsx->last_tx); |
| tsx->last_tx = ack_tdata; |
| |
| /* This is a bug. |
| tsx_send_msg() does NOT decrement tdata's reference counter, |
| so if we add the reference counter here, tdata will have |
| reference counter 2, causing it to leak. |
| pjsip_tx_data_add_ref(ack_tdata); |
| */ |
| } |
| } |
| |
| /* Start Timer D with TD/T4 timer if unreliable transport is used. */ |
| /* Note: tsx->transport may be NULL! */ |
| if (!tsx->is_reliable) { |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| timeout = td_timer_val; |
| } else { |
| timeout = t4_timer_val; |
| } |
| } else { |
| timeout.sec = timeout.msec = 0; |
| } |
| lock_timer(tsx); |
| /* In the short period above timer may have been inserted |
| * by set_timeout() (by CANCEL). Cancel it if necessary. See: |
| * https://trac.pjsip.org/repos/ticket/1374 |
| */ |
| tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, |
| TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| } else { |
| // Shouldn't happen because there's no timer for this state. |
| pj_assert(!"Unexpected event"); |
| return PJ_EBUG; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in Completed state for UAS |
| */ |
| static pj_status_t tsx_on_state_completed_uas( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_COMPLETED); |
| |
| if (event->type == PJSIP_EVENT_RX_MSG) { |
| pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| |
| /* This must be a request message retransmission. */ |
| if (msg->type != PJSIP_REQUEST_MSG) |
| return PJSIP_ENOTREQUESTMSG; |
| |
| /* On receive request retransmission, retransmit last response. */ |
| if (msg->line.req.method.id != PJSIP_ACK_METHOD) { |
| pj_status_t status; |
| |
| status = tsx_retransmit( tsx, 0 ); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| } else { |
| pj_time_val timeout; |
| |
| /* Process incoming ACK request. */ |
| |
| /* Verify that this is an INVITE transaction */ |
| if (tsx->method.id != PJSIP_INVITE_METHOD) { |
| PJ_LOG(2, (tsx->obj_name, |
| "Received illegal ACK for %.*s transaction", |
| (int)tsx->method.name.slen, |
| tsx->method.name.ptr)); |
| return PJSIP_EINVALIDMETHOD; |
| } |
| |
| /* Cease retransmission. */ |
| tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| |
| tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| |
| /* Reschedule timeout timer. */ |
| lock_timer(tsx); |
| tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| |
| /* Timer I is T4 timer for unreliable transports, and |
| * zero seconds for reliable transports. |
| */ |
| if (!tsx->is_reliable) { |
| timeout.sec = 0; |
| timeout.msec = 0; |
| } else { |
| timeout.sec = t4_timer_val.sec; |
| timeout.msec = t4_timer_val.msec; |
| } |
| tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| &timeout, TIMEOUT_TIMER); |
| unlock_timer(tsx); |
| |
| /* Move state to "Confirmed" */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_CONFIRMED, |
| PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| } |
| |
| } else if (event->type == PJSIP_EVENT_TIMER) { |
| |
| if (event->body.timer.entry == &tsx->retransmit_timer) { |
| /* Retransmit message. */ |
| pj_status_t status; |
| |
| status = tsx_retransmit( tsx, 1 ); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| |
| } else { |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| |
| /* For INVITE, this means that ACK was never received. |
| * Set state to Terminated, and inform TU. |
| */ |
| |
| tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else { |
| /* Transaction terminated, it can now be deleted. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| //return PJSIP_ETSXDESTROYED; |
| } |
| } |
| |
| } else { |
| /* Ignore request to transmit. */ |
| PJ_ASSERT_RETURN(event->type == PJSIP_EVENT_TX_MSG && |
| event->body.tx_msg.tdata == tsx->last_tx, |
| PJ_EINVALIDOP); |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in Completed state for UAC transaction. |
| */ |
| static pj_status_t tsx_on_state_completed_uac( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_COMPLETED); |
| |
| if (event->type == PJSIP_EVENT_TIMER) { |
| /* Must be the timeout timer. */ |
| pj_assert(event->body.timer.entry == &tsx->timeout_timer); |
| |
| /* Move to Terminated state. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, event->body.timer.entry ); |
| |
| /* Transaction has been destroyed. */ |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else if (event->type == PJSIP_EVENT_RX_MSG) { |
| if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| /* On received of final response retransmission, retransmit the ACK. |
| * TU doesn't need to be informed. |
| */ |
| pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| pj_assert(msg->type == PJSIP_RESPONSE_MSG); |
| if (msg->type==PJSIP_RESPONSE_MSG && |
| msg->line.status.code >= 200) |
| { |
| pj_status_t status; |
| |
| status = tsx_retransmit( tsx, 0 ); |
| if (status != PJ_SUCCESS) { |
| return status; |
| } |
| } else { |
| /* Very late retransmission of privisional response. */ |
| pj_assert( msg->type == PJSIP_RESPONSE_MSG ); |
| } |
| } else { |
| /* Just drop the response. */ |
| } |
| |
| } else { |
| pj_assert(!"Unexpected event"); |
| return PJ_EINVALIDOP; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in state Confirmed. |
| */ |
| static pj_status_t tsx_on_state_confirmed( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_CONFIRMED); |
| |
| /* This state is only for UAS for INVITE. */ |
| pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| pj_assert(tsx->method.id == PJSIP_INVITE_METHOD); |
| |
| /* Absorb any ACK received. */ |
| if (event->type == PJSIP_EVENT_RX_MSG) { |
| |
| pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| |
| /* Only expecting request message. */ |
| if (msg->type != PJSIP_REQUEST_MSG) |
| return PJSIP_ENOTREQUESTMSG; |
| |
| /* Must be an ACK request or a late INVITE retransmission. */ |
| pj_assert(msg->line.req.method.id == PJSIP_ACK_METHOD || |
| msg->line.req.method.id == PJSIP_INVITE_METHOD); |
| |
| } else if (event->type == PJSIP_EVENT_TIMER) { |
| /* Must be from timeout_timer_. */ |
| pj_assert(event->body.timer.entry == &tsx->timeout_timer); |
| |
| /* Move to Terminated state. */ |
| tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| |
| /* Transaction has been destroyed. */ |
| //return PJSIP_ETSXDESTROYED; |
| |
| } else { |
| pj_assert(!"Unexpected event"); |
| return PJ_EBUG; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in state Terminated. |
| */ |
| static pj_status_t tsx_on_state_terminated( pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| pj_assert(tsx->state == PJSIP_TSX_STATE_TERMINATED); |
| |
| /* Ignore events other than timer. This used to be an assertion but |
| * events may genuinely arrive at this state. |
| */ |
| if (event->type != PJSIP_EVENT_TIMER) { |
| return PJ_EIGNORED; |
| } |
| |
| /* Destroy this transaction */ |
| tsx_set_state(tsx, PJSIP_TSX_STATE_DESTROYED, |
| event->type, event->body.user.user1 ); |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Handler for events in state Destroyed. |
| * Shouldn't happen! |
| */ |
| static pj_status_t tsx_on_state_destroyed(pjsip_transaction *tsx, |
| pjsip_event *event) |
| { |
| PJ_UNUSED_ARG(tsx); |
| PJ_UNUSED_ARG(event); |
| |
| // See https://trac.pjsip.org/repos/ticket/1432 |
| //pj_assert(!"Not expecting any events!!"); |
| |
| return PJ_EIGNORED; |
| } |
| |