Alexandre Lision | 8af73cb | 2013-12-10 14:11:20 -0500 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjsip/sip_transaction.h> |
| 21 | #include <pjsip/sip_util.h> |
| 22 | #include <pjsip/sip_module.h> |
| 23 | #include <pjsip/sip_endpoint.h> |
| 24 | #include <pjsip/sip_errno.h> |
| 25 | #include <pjsip/sip_event.h> |
| 26 | #include <pjlib-util/errno.h> |
| 27 | #include <pj/hash.h> |
| 28 | #include <pj/pool.h> |
| 29 | #include <pj/os.h> |
| 30 | #include <pj/rand.h> |
| 31 | #include <pj/string.h> |
| 32 | #include <pj/assert.h> |
| 33 | #include <pj/guid.h> |
| 34 | #include <pj/log.h> |
| 35 | |
| 36 | #define THIS_FILE "sip_transaction.c" |
| 37 | |
| 38 | #if 0 |
| 39 | #define TSX_TRACE_(expr) PJ_LOG(3,expr) |
| 40 | #else |
| 41 | #define TSX_TRACE_(expr) |
| 42 | #endif |
| 43 | |
| 44 | /* When this macro is set, transaction will keep the hashed value |
| 45 | * so that future lookup (to unregister transaction) does not need |
| 46 | * to recalculate the hash again. It should gains a little bit of |
| 47 | * performance, so generally we'd want this. |
| 48 | */ |
| 49 | #define PRECALC_HASH |
| 50 | |
| 51 | |
| 52 | /* Defined in sip_util_statefull.c */ |
| 53 | extern pjsip_module mod_stateful_util; |
| 54 | |
| 55 | |
| 56 | /***************************************************************************** |
| 57 | ** |
| 58 | ** Declarations and static variable definitions section. |
| 59 | ** |
| 60 | ***************************************************************************** |
| 61 | **/ |
| 62 | /* Prototypes. */ |
| 63 | static pj_status_t mod_tsx_layer_load(pjsip_endpoint *endpt); |
| 64 | static pj_status_t mod_tsx_layer_start(void); |
| 65 | static pj_status_t mod_tsx_layer_stop(void); |
| 66 | static pj_status_t mod_tsx_layer_unload(void); |
| 67 | static pj_bool_t mod_tsx_layer_on_rx_request(pjsip_rx_data *rdata); |
| 68 | static pj_bool_t mod_tsx_layer_on_rx_response(pjsip_rx_data *rdata); |
| 69 | |
| 70 | /* Transaction layer module definition. */ |
| 71 | static struct mod_tsx_layer |
| 72 | { |
| 73 | struct pjsip_module mod; |
| 74 | pj_pool_t *pool; |
| 75 | pjsip_endpoint *endpt; |
| 76 | pj_mutex_t *mutex; |
| 77 | pj_hash_table_t *htable; |
| 78 | } mod_tsx_layer = |
| 79 | { { |
| 80 | NULL, NULL, /* List's prev and next. */ |
| 81 | { "mod-tsx-layer", 13 }, /* Module name. */ |
| 82 | -1, /* Module ID */ |
| 83 | PJSIP_MOD_PRIORITY_TSX_LAYER, /* Priority. */ |
| 84 | mod_tsx_layer_load, /* load(). */ |
| 85 | mod_tsx_layer_start, /* start() */ |
| 86 | mod_tsx_layer_stop, /* stop() */ |
| 87 | mod_tsx_layer_unload, /* unload() */ |
| 88 | mod_tsx_layer_on_rx_request, /* on_rx_request() */ |
| 89 | mod_tsx_layer_on_rx_response, /* on_rx_response() */ |
| 90 | NULL |
| 91 | } |
| 92 | }; |
| 93 | |
| 94 | /* Transaction state names */ |
| 95 | static const char *state_str[] = |
| 96 | { |
| 97 | "Null", |
| 98 | "Calling", |
| 99 | "Trying", |
| 100 | "Proceeding", |
| 101 | "Completed", |
| 102 | "Confirmed", |
| 103 | "Terminated", |
| 104 | "Destroyed", |
| 105 | }; |
| 106 | |
| 107 | /* Role names */ |
| 108 | static const char *role_name[] = |
| 109 | { |
| 110 | "UAC", |
| 111 | "UAS" |
| 112 | }; |
| 113 | |
| 114 | /* Transport flag. */ |
| 115 | enum |
| 116 | { |
| 117 | TSX_HAS_PENDING_TRANSPORT = 1, |
| 118 | TSX_HAS_PENDING_RESCHED = 2, |
| 119 | TSX_HAS_PENDING_SEND = 4, |
| 120 | TSX_HAS_PENDING_DESTROY = 8, |
| 121 | TSX_HAS_RESOLVED_SERVER = 16, |
| 122 | }; |
| 123 | |
| 124 | /* Timer timeout value constants */ |
| 125 | static pj_time_val t1_timer_val = { PJSIP_T1_TIMEOUT/1000, |
| 126 | PJSIP_T1_TIMEOUT%1000 }; |
| 127 | static pj_time_val t2_timer_val = { PJSIP_T2_TIMEOUT/1000, |
| 128 | PJSIP_T2_TIMEOUT%1000 }; |
| 129 | static pj_time_val t4_timer_val = { PJSIP_T4_TIMEOUT/1000, |
| 130 | PJSIP_T4_TIMEOUT%1000 }; |
| 131 | static pj_time_val td_timer_val = { PJSIP_TD_TIMEOUT/1000, |
| 132 | PJSIP_TD_TIMEOUT%1000 }; |
| 133 | static pj_time_val timeout_timer_val = { (64*PJSIP_T1_TIMEOUT)/1000, |
| 134 | (64*PJSIP_T1_TIMEOUT)%1000 }; |
| 135 | |
| 136 | #define TIMER_INACTIVE 0 |
| 137 | #define RETRANSMIT_TIMER 1 |
| 138 | #define TIMEOUT_TIMER 2 |
| 139 | #define TRANSPORT_ERR_TIMER 3 |
| 140 | |
| 141 | |
| 142 | /* Prototypes. */ |
| 143 | static pj_status_t tsx_on_state_null( pjsip_transaction *tsx, |
| 144 | pjsip_event *event); |
| 145 | static pj_status_t tsx_on_state_calling( pjsip_transaction *tsx, |
| 146 | pjsip_event *event); |
| 147 | static pj_status_t tsx_on_state_trying( pjsip_transaction *tsx, |
| 148 | pjsip_event *event); |
| 149 | static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx, |
| 150 | pjsip_event *event); |
| 151 | static pj_status_t tsx_on_state_proceeding_uac( pjsip_transaction *tsx, |
| 152 | pjsip_event *event); |
| 153 | static pj_status_t tsx_on_state_completed_uas( pjsip_transaction *tsx, |
| 154 | pjsip_event *event); |
| 155 | static pj_status_t tsx_on_state_completed_uac( pjsip_transaction *tsx, |
| 156 | pjsip_event *event); |
| 157 | static pj_status_t tsx_on_state_confirmed( pjsip_transaction *tsx, |
| 158 | pjsip_event *event); |
| 159 | static pj_status_t tsx_on_state_terminated( pjsip_transaction *tsx, |
| 160 | pjsip_event *event); |
| 161 | static pj_status_t tsx_on_state_destroyed( pjsip_transaction *tsx, |
| 162 | pjsip_event *event); |
| 163 | static void tsx_timer_callback( pj_timer_heap_t *theap, |
| 164 | pj_timer_entry *entry); |
| 165 | static void tsx_tp_state_callback( |
| 166 | pjsip_transport *tp, |
| 167 | pjsip_transport_state state, |
| 168 | const pjsip_transport_state_info *info); |
| 169 | static void tsx_set_state( pjsip_transaction *tsx, |
| 170 | pjsip_tsx_state_e state, |
| 171 | pjsip_event_id_e event_src_type, |
| 172 | void *event_src ); |
| 173 | static void tsx_set_state_no_notify( pjsip_transaction *tsx, |
| 174 | pjsip_tsx_state_e state, |
| 175 | pjsip_event_id_e event_src_type, |
| 176 | void *event_src ); |
| 177 | static void tsx_set_status_code(pjsip_transaction *tsx, |
| 178 | int code, const pj_str_t *reason); |
| 179 | static pj_status_t tsx_create( pjsip_module *tsx_user, |
| 180 | pj_grp_lock_t *grp_lock, |
| 181 | pjsip_transaction **p_tsx); |
| 182 | static void tsx_on_destroy(void *arg); |
| 183 | static pj_status_t tsx_shutdown( pjsip_transaction *tsx ); |
| 184 | static void tsx_resched_retransmission( pjsip_transaction *tsx ); |
| 185 | static pj_status_t tsx_retransmit( pjsip_transaction *tsx, int resched); |
| 186 | static int tsx_send_msg( pjsip_transaction *tsx, |
| 187 | pjsip_tx_data *tdata); |
| 188 | static void tsx_update_transport( pjsip_transaction *tsx, |
| 189 | pjsip_transport *tp); |
| 190 | |
| 191 | |
| 192 | /* State handlers for UAC, indexed by state */ |
| 193 | static int (*tsx_state_handler_uac[PJSIP_TSX_STATE_MAX])(pjsip_transaction *, |
| 194 | pjsip_event *) = |
| 195 | { |
| 196 | &tsx_on_state_null, |
| 197 | &tsx_on_state_calling, |
| 198 | NULL, |
| 199 | &tsx_on_state_proceeding_uac, |
| 200 | &tsx_on_state_completed_uac, |
| 201 | &tsx_on_state_confirmed, |
| 202 | &tsx_on_state_terminated, |
| 203 | &tsx_on_state_destroyed, |
| 204 | }; |
| 205 | |
| 206 | /* State handlers for UAS */ |
| 207 | static int (*tsx_state_handler_uas[PJSIP_TSX_STATE_MAX])(pjsip_transaction *, |
| 208 | pjsip_event *) = |
| 209 | { |
| 210 | &tsx_on_state_null, |
| 211 | NULL, |
| 212 | &tsx_on_state_trying, |
| 213 | &tsx_on_state_proceeding_uas, |
| 214 | &tsx_on_state_completed_uas, |
| 215 | &tsx_on_state_confirmed, |
| 216 | &tsx_on_state_terminated, |
| 217 | &tsx_on_state_destroyed, |
| 218 | }; |
| 219 | |
| 220 | /***************************************************************************** |
| 221 | ** |
| 222 | ** Utilities |
| 223 | ** |
| 224 | ***************************************************************************** |
| 225 | */ |
| 226 | /* |
| 227 | * Get transaction state name. |
| 228 | */ |
| 229 | PJ_DEF(const char *) pjsip_tsx_state_str(pjsip_tsx_state_e state) |
| 230 | { |
| 231 | return state_str[state]; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Get the role name. |
| 236 | */ |
| 237 | PJ_DEF(const char *) pjsip_role_name(pjsip_role_e role) |
| 238 | { |
| 239 | return role_name[role]; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | /* |
| 244 | * Create transaction key for RFC2543 compliant messages, which don't have |
| 245 | * unique branch parameter in the top most Via header. |
| 246 | * |
| 247 | * INVITE requests matches a transaction if the following attributes |
| 248 | * match the original request: |
| 249 | * - Request-URI |
| 250 | * - To tag |
| 251 | * - From tag |
| 252 | * - Call-ID |
| 253 | * - CSeq |
| 254 | * - top Via header |
| 255 | * |
| 256 | * CANCEL matching is done similarly as INVITE, except: |
| 257 | * - CSeq method will differ |
| 258 | * - To tag is not matched. |
| 259 | * |
| 260 | * ACK matching is done similarly, except that: |
| 261 | * - method of the CSeq will differ, |
| 262 | * - To tag is matched to the response sent by the server transaction. |
| 263 | * |
| 264 | * The transaction key is constructed from the common components of above |
| 265 | * components. Additional comparison is needed to fully match a transaction. |
| 266 | */ |
| 267 | static pj_status_t create_tsx_key_2543( pj_pool_t *pool, |
| 268 | pj_str_t *str, |
| 269 | pjsip_role_e role, |
| 270 | const pjsip_method *method, |
| 271 | const pjsip_rx_data *rdata ) |
| 272 | { |
| 273 | #define SEPARATOR '$' |
| 274 | char *key, *p; |
| 275 | pj_ssize_t len; |
| 276 | pj_size_t len_required; |
| 277 | pj_str_t *host; |
| 278 | |
| 279 | PJ_ASSERT_RETURN(pool && str && method && rdata, PJ_EINVAL); |
| 280 | PJ_ASSERT_RETURN(rdata->msg_info.msg, PJ_EINVAL); |
| 281 | PJ_ASSERT_RETURN(rdata->msg_info.via, PJSIP_EMISSINGHDR); |
| 282 | PJ_ASSERT_RETURN(rdata->msg_info.cseq, PJSIP_EMISSINGHDR); |
| 283 | PJ_ASSERT_RETURN(rdata->msg_info.from, PJSIP_EMISSINGHDR); |
| 284 | |
| 285 | host = &rdata->msg_info.via->sent_by.host; |
| 286 | |
| 287 | /* Calculate length required. */ |
| 288 | len_required = 9 + /* CSeq number */ |
| 289 | rdata->msg_info.from->tag.slen + /* From tag. */ |
| 290 | rdata->msg_info.cid->id.slen + /* Call-ID */ |
| 291 | host->slen + /* Via host. */ |
| 292 | 9 + /* Via port. */ |
| 293 | 16; /* Separator+Allowance. */ |
| 294 | key = p = (char*) pj_pool_alloc(pool, len_required); |
| 295 | |
| 296 | /* Add role. */ |
| 297 | *p++ = (char)(role==PJSIP_ROLE_UAC ? 'c' : 's'); |
| 298 | *p++ = SEPARATOR; |
| 299 | |
| 300 | /* Add method, except when method is INVITE or ACK. */ |
| 301 | if (method->id != PJSIP_INVITE_METHOD && method->id != PJSIP_ACK_METHOD) { |
| 302 | pj_memcpy(p, method->name.ptr, method->name.slen); |
| 303 | p += method->name.slen; |
| 304 | *p++ = '$'; |
| 305 | } |
| 306 | |
| 307 | /* Add CSeq (only the number). */ |
| 308 | len = pj_utoa(rdata->msg_info.cseq->cseq, p); |
| 309 | p += len; |
| 310 | *p++ = SEPARATOR; |
| 311 | |
| 312 | /* Add From tag. */ |
| 313 | len = rdata->msg_info.from->tag.slen; |
| 314 | pj_memcpy( p, rdata->msg_info.from->tag.ptr, len); |
| 315 | p += len; |
| 316 | *p++ = SEPARATOR; |
| 317 | |
| 318 | /* Add Call-ID. */ |
| 319 | len = rdata->msg_info.cid->id.slen; |
| 320 | pj_memcpy( p, rdata->msg_info.cid->id.ptr, len ); |
| 321 | p += len; |
| 322 | *p++ = SEPARATOR; |
| 323 | |
| 324 | /* Add top Via header. |
| 325 | * We don't really care whether the port contains the real port (because |
| 326 | * it can be omited if default port is used). Anyway this function is |
| 327 | * only used to match request retransmission, and we expect that the |
| 328 | * request retransmissions will contain the same port. |
| 329 | */ |
| 330 | pj_memcpy(p, host->ptr, host->slen); |
| 331 | p += host->slen; |
| 332 | *p++ = ':'; |
| 333 | |
| 334 | len = pj_utoa(rdata->msg_info.via->sent_by.port, p); |
| 335 | p += len; |
| 336 | *p++ = SEPARATOR; |
| 337 | |
| 338 | *p++ = '\0'; |
| 339 | |
| 340 | /* Done. */ |
| 341 | str->ptr = key; |
| 342 | str->slen = p-key; |
| 343 | |
| 344 | return PJ_SUCCESS; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Create transaction key for RFC3161 compliant system. |
| 349 | */ |
| 350 | static pj_status_t create_tsx_key_3261( pj_pool_t *pool, |
| 351 | pj_str_t *key, |
| 352 | pjsip_role_e role, |
| 353 | const pjsip_method *method, |
| 354 | const pj_str_t *branch) |
| 355 | { |
| 356 | char *p; |
| 357 | |
| 358 | PJ_ASSERT_RETURN(pool && key && method && branch, PJ_EINVAL); |
| 359 | |
| 360 | p = key->ptr = (char*) |
| 361 | pj_pool_alloc(pool, branch->slen + method->name.slen + 4 ); |
| 362 | |
| 363 | /* Add role. */ |
| 364 | *p++ = (char)(role==PJSIP_ROLE_UAC ? 'c' : 's'); |
| 365 | *p++ = SEPARATOR; |
| 366 | |
| 367 | /* Add method, except when method is INVITE or ACK. */ |
| 368 | if (method->id != PJSIP_INVITE_METHOD && method->id != PJSIP_ACK_METHOD) { |
| 369 | pj_memcpy(p, method->name.ptr, method->name.slen); |
| 370 | p += method->name.slen; |
| 371 | *p++ = '$'; |
| 372 | } |
| 373 | |
| 374 | /* Add branch ID. */ |
| 375 | pj_memcpy(p, branch->ptr, branch->slen); |
| 376 | p += branch->slen; |
| 377 | |
| 378 | /* Set length */ |
| 379 | key->slen = p - key->ptr; |
| 380 | |
| 381 | return PJ_SUCCESS; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Create key from the incoming data, to be used to search the transaction |
| 386 | * in the transaction hash table. |
| 387 | */ |
| 388 | PJ_DEF(pj_status_t) pjsip_tsx_create_key( pj_pool_t *pool, pj_str_t *key, |
| 389 | pjsip_role_e role, |
| 390 | const pjsip_method *method, |
| 391 | const pjsip_rx_data *rdata) |
| 392 | { |
| 393 | pj_str_t rfc3261_branch = {PJSIP_RFC3261_BRANCH_ID, |
| 394 | PJSIP_RFC3261_BRANCH_LEN}; |
| 395 | |
| 396 | |
| 397 | /* Get the branch parameter in the top-most Via. |
| 398 | * If branch parameter is started with "z9hG4bK", then the message was |
| 399 | * generated by agent compliant with RFC3261. Otherwise, it will be |
| 400 | * handled as RFC2543. |
| 401 | */ |
| 402 | const pj_str_t *branch = &rdata->msg_info.via->branch_param; |
| 403 | |
| 404 | if (pj_strnicmp(branch,&rfc3261_branch,PJSIP_RFC3261_BRANCH_LEN)==0) { |
| 405 | |
| 406 | /* Create transaction key. */ |
| 407 | return create_tsx_key_3261(pool, key, role, method, branch); |
| 408 | |
| 409 | } else { |
| 410 | /* Create the key for the message. This key will be matched up |
| 411 | * with the transaction key. For RFC2563 transactions, the |
| 412 | * transaction key was created by the same function, so it will |
| 413 | * match the message. |
| 414 | */ |
| 415 | return create_tsx_key_2543( pool, key, role, method, rdata ); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | /***************************************************************************** |
| 420 | ** |
| 421 | ** Transaction layer module |
| 422 | ** |
| 423 | ***************************************************************************** |
| 424 | **/ |
| 425 | /* |
| 426 | * Create transaction layer module and registers it to the endpoint. |
| 427 | */ |
| 428 | PJ_DEF(pj_status_t) pjsip_tsx_layer_init_module(pjsip_endpoint *endpt) |
| 429 | { |
| 430 | pj_pool_t *pool; |
| 431 | pj_status_t status; |
| 432 | |
| 433 | |
| 434 | PJ_ASSERT_RETURN(mod_tsx_layer.endpt==NULL, PJ_EINVALIDOP); |
| 435 | |
| 436 | /* Initialize timer values */ |
| 437 | t1_timer_val.sec = pjsip_cfg()->tsx.t1 / 1000; |
| 438 | t1_timer_val.msec = pjsip_cfg()->tsx.t1 % 1000; |
| 439 | t2_timer_val.sec = pjsip_cfg()->tsx.t2 / 1000; |
| 440 | t2_timer_val.msec = pjsip_cfg()->tsx.t2 % 1000; |
| 441 | t4_timer_val.sec = pjsip_cfg()->tsx.t4 / 1000; |
| 442 | t4_timer_val.msec = pjsip_cfg()->tsx.t4 % 1000; |
| 443 | td_timer_val.sec = pjsip_cfg()->tsx.td / 1000; |
| 444 | td_timer_val.msec = pjsip_cfg()->tsx.td % 1000; |
| 445 | /* Changed the initialization below to use td_timer_val instead, to enable |
| 446 | * customization to the timeout value. |
| 447 | */ |
| 448 | //timeout_timer_val.sec = (64 * pjsip_cfg()->tsx.t1) / 1000; |
| 449 | //timeout_timer_val.msec = (64 * pjsip_cfg()->tsx.t1) % 1000; |
| 450 | timeout_timer_val = td_timer_val; |
| 451 | |
| 452 | /* |
| 453 | * Initialize transaction layer structure. |
| 454 | */ |
| 455 | |
| 456 | /* Create pool for the module. */ |
| 457 | pool = pjsip_endpt_create_pool(endpt, "tsxlayer", |
| 458 | PJSIP_POOL_TSX_LAYER_LEN, |
| 459 | PJSIP_POOL_TSX_LAYER_INC ); |
| 460 | if (!pool) |
| 461 | return PJ_ENOMEM; |
| 462 | |
| 463 | |
| 464 | /* Initialize some attributes. */ |
| 465 | mod_tsx_layer.pool = pool; |
| 466 | mod_tsx_layer.endpt = endpt; |
| 467 | |
| 468 | |
| 469 | /* Create hash table. */ |
| 470 | mod_tsx_layer.htable = pj_hash_create( pool, pjsip_cfg()->tsx.max_count ); |
| 471 | if (!mod_tsx_layer.htable) { |
| 472 | pjsip_endpt_release_pool(endpt, pool); |
| 473 | return PJ_ENOMEM; |
| 474 | } |
| 475 | |
| 476 | /* Create group lock. */ |
| 477 | status = pj_mutex_create_recursive(pool, "tsxlayer", &mod_tsx_layer.mutex); |
| 478 | if (status != PJ_SUCCESS) { |
| 479 | pjsip_endpt_release_pool(endpt, pool); |
| 480 | return status; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Register transaction layer module to endpoint. |
| 485 | */ |
| 486 | status = pjsip_endpt_register_module( endpt, &mod_tsx_layer.mod ); |
| 487 | if (status != PJ_SUCCESS) { |
| 488 | pj_mutex_destroy(mod_tsx_layer.mutex); |
| 489 | pjsip_endpt_release_pool(endpt, pool); |
| 490 | return status; |
| 491 | } |
| 492 | |
| 493 | /* Register mod_stateful_util module (sip_util_statefull.c) */ |
| 494 | status = pjsip_endpt_register_module(endpt, &mod_stateful_util); |
| 495 | if (status != PJ_SUCCESS) { |
| 496 | return status; |
| 497 | } |
| 498 | |
| 499 | return PJ_SUCCESS; |
| 500 | } |
| 501 | |
| 502 | |
| 503 | /* |
| 504 | * Get the instance of transaction layer module. |
| 505 | */ |
| 506 | PJ_DEF(pjsip_module*) pjsip_tsx_layer_instance(void) |
| 507 | { |
| 508 | return &mod_tsx_layer.mod; |
| 509 | } |
| 510 | |
| 511 | |
| 512 | /* |
| 513 | * Unregister and destroy transaction layer module. |
| 514 | */ |
| 515 | PJ_DEF(pj_status_t) pjsip_tsx_layer_destroy(void) |
| 516 | { |
| 517 | /* Are we registered? */ |
| 518 | PJ_ASSERT_RETURN(mod_tsx_layer.endpt!=NULL, PJ_EINVALIDOP); |
| 519 | |
| 520 | /* Unregister from endpoint. |
| 521 | * Clean-ups will be done in the unload() module callback. |
| 522 | */ |
| 523 | return pjsip_endpt_unregister_module( mod_tsx_layer.endpt, |
| 524 | &mod_tsx_layer.mod); |
| 525 | } |
| 526 | |
| 527 | |
| 528 | /* |
| 529 | * Register the transaction to the hash table. |
| 530 | */ |
| 531 | static pj_status_t mod_tsx_layer_register_tsx( pjsip_transaction *tsx) |
| 532 | { |
| 533 | pj_assert(tsx->transaction_key.slen != 0); |
| 534 | |
| 535 | /* Lock hash table mutex. */ |
| 536 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 537 | |
| 538 | /* Check if no transaction with the same key exists. |
| 539 | * Do not use PJ_ASSERT_RETURN since it evaluates the expression |
| 540 | * twice! |
| 541 | */ |
| 542 | if(pj_hash_get_lower(mod_tsx_layer.htable, |
| 543 | tsx->transaction_key.ptr, |
| 544 | (unsigned)tsx->transaction_key.slen, |
| 545 | NULL)) |
| 546 | { |
| 547 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 548 | PJ_LOG(2,(THIS_FILE, |
| 549 | "Unable to register %.*s transaction (key exists)", |
| 550 | (int)tsx->method.name.slen, |
| 551 | tsx->method.name.ptr)); |
| 552 | return PJ_EEXISTS; |
| 553 | } |
| 554 | |
| 555 | TSX_TRACE_((THIS_FILE, |
| 556 | "Transaction %p registered with hkey=0x%p and key=%.*s", |
| 557 | tsx, tsx->hashed_key, tsx->transaction_key.slen, |
| 558 | tsx->transaction_key.ptr)); |
| 559 | |
| 560 | /* Register the transaction to the hash table. */ |
| 561 | #ifdef PRECALC_HASH |
| 562 | pj_hash_set_lower( tsx->pool, mod_tsx_layer.htable, |
| 563 | tsx->transaction_key.ptr, |
| 564 | (unsigned)tsx->transaction_key.slen, |
| 565 | tsx->hashed_key, tsx); |
| 566 | #else |
| 567 | pj_hash_set_lower( tsx->pool, mod_tsx_layer.htable, |
| 568 | tsx->transaction_key.ptr, |
| 569 | tsx->transaction_key.slen, 0, tsx); |
| 570 | #endif |
| 571 | |
| 572 | /* Unlock mutex. */ |
| 573 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 574 | |
| 575 | return PJ_SUCCESS; |
| 576 | } |
| 577 | |
| 578 | |
| 579 | /* |
| 580 | * Unregister the transaction from the hash table. |
| 581 | */ |
| 582 | static void mod_tsx_layer_unregister_tsx( pjsip_transaction *tsx) |
| 583 | { |
| 584 | if (mod_tsx_layer.mod.id == -1) { |
| 585 | /* The transaction layer has been unregistered. This could happen |
| 586 | * if the transaction was pending on transport and the application |
| 587 | * is shutdown. See http://trac.pjsip.org/repos/ticket/1033. In |
| 588 | * this case just do nothing. |
| 589 | */ |
| 590 | return; |
| 591 | } |
| 592 | |
| 593 | pj_assert(tsx->transaction_key.slen != 0); |
| 594 | //pj_assert(tsx->state != PJSIP_TSX_STATE_NULL); |
| 595 | |
| 596 | /* Lock hash table mutex. */ |
| 597 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 598 | |
| 599 | /* Register the transaction to the hash table. */ |
| 600 | #ifdef PRECALC_HASH |
| 601 | pj_hash_set_lower( NULL, mod_tsx_layer.htable, tsx->transaction_key.ptr, |
| 602 | (unsigned)tsx->transaction_key.slen, tsx->hashed_key, |
| 603 | NULL); |
| 604 | #else |
| 605 | pj_hash_set_lower( NULL, mod_tsx_layer.htable, tsx->transaction_key.ptr, |
| 606 | tsx->transaction_key.slen, 0, NULL); |
| 607 | #endif |
| 608 | |
| 609 | TSX_TRACE_((THIS_FILE, |
| 610 | "Transaction %p unregistered, hkey=0x%p and key=%.*s", |
| 611 | tsx, tsx->hashed_key, tsx->transaction_key.slen, |
| 612 | tsx->transaction_key.ptr)); |
| 613 | |
| 614 | /* Unlock mutex. */ |
| 615 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 616 | } |
| 617 | |
| 618 | |
| 619 | /* |
| 620 | * Retrieve the current number of transactions currently registered in |
| 621 | * the hash table. |
| 622 | */ |
| 623 | PJ_DEF(unsigned) pjsip_tsx_layer_get_tsx_count(void) |
| 624 | { |
| 625 | unsigned count; |
| 626 | |
| 627 | /* Are we registered? */ |
| 628 | PJ_ASSERT_RETURN(mod_tsx_layer.endpt!=NULL, 0); |
| 629 | |
| 630 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 631 | count = pj_hash_count(mod_tsx_layer.htable); |
| 632 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 633 | |
| 634 | return count; |
| 635 | } |
| 636 | |
| 637 | |
| 638 | /* |
| 639 | * Find a transaction. |
| 640 | */ |
| 641 | PJ_DEF(pjsip_transaction*) pjsip_tsx_layer_find_tsx( const pj_str_t *key, |
| 642 | pj_bool_t lock ) |
| 643 | { |
| 644 | pjsip_transaction *tsx; |
| 645 | pj_uint32_t hval = 0; |
| 646 | |
| 647 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 648 | tsx = (pjsip_transaction*) |
| 649 | pj_hash_get_lower( mod_tsx_layer.htable, key->ptr, |
| 650 | (unsigned)key->slen, &hval ); |
| 651 | |
| 652 | /* Prevent the transaction to get deleted before we have chance to lock it. |
| 653 | */ |
| 654 | if (tsx && lock) |
| 655 | pj_grp_lock_add_ref(tsx->grp_lock); |
| 656 | |
| 657 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 658 | |
| 659 | TSX_TRACE_((THIS_FILE, |
| 660 | "Finding tsx with hkey=0x%p and key=%.*s: found %p", |
| 661 | hval, key->slen, key->ptr, tsx)); |
| 662 | |
| 663 | /* Simulate race condition! */ |
| 664 | PJ_RACE_ME(5); |
| 665 | |
| 666 | if (tsx && lock) { |
| 667 | pj_grp_lock_acquire(tsx->grp_lock); |
| 668 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 669 | } |
| 670 | |
| 671 | return tsx; |
| 672 | } |
| 673 | |
| 674 | |
| 675 | /* This module callback is called when module is being loaded by |
| 676 | * endpoint. It does nothing for this module. |
| 677 | */ |
| 678 | static pj_status_t mod_tsx_layer_load(pjsip_endpoint *endpt) |
| 679 | { |
| 680 | PJ_UNUSED_ARG(endpt); |
| 681 | return PJ_SUCCESS; |
| 682 | } |
| 683 | |
| 684 | |
| 685 | /* This module callback is called when module is being started by |
| 686 | * endpoint. It does nothing for this module. |
| 687 | */ |
| 688 | static pj_status_t mod_tsx_layer_start(void) |
| 689 | { |
| 690 | return PJ_SUCCESS; |
| 691 | } |
| 692 | |
| 693 | |
| 694 | /* This module callback is called when module is being stopped by |
| 695 | * endpoint. |
| 696 | */ |
| 697 | static pj_status_t mod_tsx_layer_stop(void) |
| 698 | { |
| 699 | pj_hash_iterator_t it_buf, *it; |
| 700 | |
| 701 | PJ_LOG(4,(THIS_FILE, "Stopping transaction layer module")); |
| 702 | |
| 703 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 704 | |
| 705 | /* Destroy all transactions. */ |
| 706 | it = pj_hash_first(mod_tsx_layer.htable, &it_buf); |
| 707 | while (it) { |
| 708 | pjsip_transaction *tsx = (pjsip_transaction*) |
| 709 | pj_hash_this(mod_tsx_layer.htable, it); |
| 710 | pj_hash_iterator_t *next = pj_hash_next(mod_tsx_layer.htable, it); |
| 711 | if (tsx) { |
| 712 | pjsip_tsx_terminate(tsx, PJSIP_SC_SERVICE_UNAVAILABLE); |
| 713 | mod_tsx_layer_unregister_tsx(tsx); |
| 714 | tsx_shutdown(tsx); |
| 715 | } |
| 716 | it = next; |
| 717 | } |
| 718 | |
| 719 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 720 | |
| 721 | PJ_LOG(4,(THIS_FILE, "Stopped transaction layer module")); |
| 722 | |
| 723 | return PJ_SUCCESS; |
| 724 | } |
| 725 | |
| 726 | |
| 727 | /* Destroy this module */ |
| 728 | static void tsx_layer_destroy(pjsip_endpoint *endpt) |
| 729 | { |
| 730 | PJ_UNUSED_ARG(endpt); |
| 731 | |
| 732 | /* Destroy mutex. */ |
| 733 | pj_mutex_destroy(mod_tsx_layer.mutex); |
| 734 | |
| 735 | /* Release pool. */ |
| 736 | pjsip_endpt_release_pool(mod_tsx_layer.endpt, mod_tsx_layer.pool); |
| 737 | |
| 738 | /* Mark as unregistered. */ |
| 739 | mod_tsx_layer.endpt = NULL; |
| 740 | |
| 741 | PJ_LOG(4,(THIS_FILE, "Transaction layer module destroyed")); |
| 742 | } |
| 743 | |
| 744 | |
| 745 | /* This module callback is called when module is being unloaded by |
| 746 | * endpoint. |
| 747 | */ |
| 748 | static pj_status_t mod_tsx_layer_unload(void) |
| 749 | { |
| 750 | /* Only self destroy when there's no transaction in the table. |
| 751 | * Transaction may refuse to destroy when it has pending |
| 752 | * transmission. If we destroy the module now, application will |
| 753 | * crash when the pending transaction finally got error response |
| 754 | * from transport and when it tries to unregister itself. |
| 755 | */ |
| 756 | if (pj_hash_count(mod_tsx_layer.htable) != 0) { |
| 757 | if (pjsip_endpt_atexit(mod_tsx_layer.endpt, &tsx_layer_destroy) != |
| 758 | PJ_SUCCESS) |
| 759 | { |
| 760 | PJ_LOG(3,(THIS_FILE, "Failed to register transaction layer " |
| 761 | "module destroy.")); |
| 762 | } |
| 763 | return PJ_EBUSY; |
| 764 | } |
| 765 | |
| 766 | tsx_layer_destroy(mod_tsx_layer.endpt); |
| 767 | |
| 768 | return PJ_SUCCESS; |
| 769 | } |
| 770 | |
| 771 | |
| 772 | /* This module callback is called when endpoint has received an |
| 773 | * incoming request message. |
| 774 | */ |
| 775 | static pj_bool_t mod_tsx_layer_on_rx_request(pjsip_rx_data *rdata) |
| 776 | { |
| 777 | pj_str_t key; |
| 778 | pj_uint32_t hval = 0; |
| 779 | pjsip_transaction *tsx; |
| 780 | |
| 781 | pjsip_tsx_create_key(rdata->tp_info.pool, &key, PJSIP_ROLE_UAS, |
| 782 | &rdata->msg_info.cseq->method, rdata); |
| 783 | |
| 784 | /* Find transaction. */ |
| 785 | pj_mutex_lock( mod_tsx_layer.mutex ); |
| 786 | |
| 787 | tsx = (pjsip_transaction*) |
| 788 | pj_hash_get_lower( mod_tsx_layer.htable, key.ptr, (unsigned)key.slen, |
| 789 | &hval ); |
| 790 | |
| 791 | |
| 792 | TSX_TRACE_((THIS_FILE, |
| 793 | "Finding tsx for request, hkey=0x%p and key=%.*s, found %p", |
| 794 | hval, key.slen, key.ptr, tsx)); |
| 795 | |
| 796 | |
| 797 | if (tsx == NULL || tsx->state == PJSIP_TSX_STATE_TERMINATED) { |
| 798 | /* Transaction not found. |
| 799 | * Reject the request so that endpoint passes the request to |
| 800 | * upper layer modules. |
| 801 | */ |
| 802 | pj_mutex_unlock( mod_tsx_layer.mutex); |
| 803 | return PJ_FALSE; |
| 804 | } |
| 805 | |
| 806 | /* Prevent the transaction to get deleted before we have chance to lock it |
| 807 | * in pjsip_tsx_recv_msg(). |
| 808 | */ |
| 809 | pj_grp_lock_add_ref(tsx->grp_lock); |
| 810 | |
| 811 | /* Unlock hash table. */ |
| 812 | pj_mutex_unlock( mod_tsx_layer.mutex ); |
| 813 | |
| 814 | /* Simulate race condition! */ |
| 815 | PJ_RACE_ME(5); |
| 816 | |
| 817 | /* Pass the message to the transaction. */ |
| 818 | pjsip_tsx_recv_msg(tsx, rdata ); |
| 819 | |
| 820 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 821 | |
| 822 | return PJ_TRUE; |
| 823 | } |
| 824 | |
| 825 | |
| 826 | /* This module callback is called when endpoint has received an |
| 827 | * incoming response message. |
| 828 | */ |
| 829 | static pj_bool_t mod_tsx_layer_on_rx_response(pjsip_rx_data *rdata) |
| 830 | { |
| 831 | pj_str_t key; |
| 832 | pj_uint32_t hval = 0; |
| 833 | pjsip_transaction *tsx; |
| 834 | |
| 835 | pjsip_tsx_create_key(rdata->tp_info.pool, &key, PJSIP_ROLE_UAC, |
| 836 | &rdata->msg_info.cseq->method, rdata); |
| 837 | |
| 838 | /* Find transaction. */ |
| 839 | pj_mutex_lock( mod_tsx_layer.mutex ); |
| 840 | |
| 841 | tsx = (pjsip_transaction*) |
| 842 | pj_hash_get_lower( mod_tsx_layer.htable, key.ptr, (unsigned)key.slen, |
| 843 | &hval ); |
| 844 | |
| 845 | |
| 846 | TSX_TRACE_((THIS_FILE, |
| 847 | "Finding tsx for response, hkey=0x%p and key=%.*s, found %p", |
| 848 | hval, key.slen, key.ptr, tsx)); |
| 849 | |
| 850 | |
| 851 | if (tsx == NULL || tsx->state == PJSIP_TSX_STATE_TERMINATED) { |
| 852 | /* Transaction not found. |
| 853 | * Reject the request so that endpoint passes the request to |
| 854 | * upper layer modules. |
| 855 | */ |
| 856 | pj_mutex_unlock( mod_tsx_layer.mutex); |
| 857 | return PJ_FALSE; |
| 858 | } |
| 859 | |
| 860 | /* Prevent the transaction to get deleted before we have chance to lock it |
| 861 | * in pjsip_tsx_recv_msg(). |
| 862 | */ |
| 863 | pj_grp_lock_add_ref(tsx->grp_lock); |
| 864 | |
| 865 | /* Unlock hash table. */ |
| 866 | pj_mutex_unlock( mod_tsx_layer.mutex ); |
| 867 | |
| 868 | /* Simulate race condition! */ |
| 869 | PJ_RACE_ME(5); |
| 870 | |
| 871 | /* Pass the message to the transaction. */ |
| 872 | pjsip_tsx_recv_msg(tsx, rdata ); |
| 873 | |
| 874 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 875 | |
| 876 | return PJ_TRUE; |
| 877 | } |
| 878 | |
| 879 | |
| 880 | /* |
| 881 | * Get transaction instance in the rdata. |
| 882 | */ |
| 883 | PJ_DEF(pjsip_transaction*) pjsip_rdata_get_tsx( pjsip_rx_data *rdata ) |
| 884 | { |
| 885 | return (pjsip_transaction*) |
| 886 | rdata->endpt_info.mod_data[mod_tsx_layer.mod.id]; |
| 887 | } |
| 888 | |
| 889 | |
| 890 | /* |
| 891 | * Dump transaction layer. |
| 892 | */ |
| 893 | PJ_DEF(void) pjsip_tsx_layer_dump(pj_bool_t detail) |
| 894 | { |
| 895 | #if PJ_LOG_MAX_LEVEL >= 3 |
| 896 | pj_hash_iterator_t itbuf, *it; |
| 897 | |
| 898 | /* Lock mutex. */ |
| 899 | pj_mutex_lock(mod_tsx_layer.mutex); |
| 900 | |
| 901 | PJ_LOG(3, (THIS_FILE, "Dumping transaction table:")); |
| 902 | PJ_LOG(3, (THIS_FILE, " Total %d transactions", |
| 903 | pj_hash_count(mod_tsx_layer.htable))); |
| 904 | |
| 905 | if (detail) { |
| 906 | it = pj_hash_first(mod_tsx_layer.htable, &itbuf); |
| 907 | if (it == NULL) { |
| 908 | PJ_LOG(3, (THIS_FILE, " - none - ")); |
| 909 | } else { |
| 910 | while (it != NULL) { |
| 911 | pjsip_transaction *tsx = (pjsip_transaction*) |
| 912 | pj_hash_this(mod_tsx_layer.htable,it); |
| 913 | |
| 914 | PJ_LOG(3, (THIS_FILE, " %s %s|%d|%s", |
| 915 | tsx->obj_name, |
| 916 | (tsx->last_tx? |
| 917 | pjsip_tx_data_get_info(tsx->last_tx): |
| 918 | "none"), |
| 919 | tsx->status_code, |
| 920 | pjsip_tsx_state_str(tsx->state))); |
| 921 | |
| 922 | it = pj_hash_next(mod_tsx_layer.htable, it); |
| 923 | } |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | /* Unlock mutex. */ |
| 928 | pj_mutex_unlock(mod_tsx_layer.mutex); |
| 929 | #endif |
| 930 | } |
| 931 | |
| 932 | /***************************************************************************** |
| 933 | ** |
| 934 | ** Transaction |
| 935 | ** |
| 936 | ***************************************************************************** |
| 937 | **/ |
| 938 | /* Lock transaction for accessing the timeout timer only. */ |
| 939 | static void lock_timer(pjsip_transaction *tsx) |
| 940 | { |
| 941 | pj_mutex_lock(tsx->mutex_b); |
| 942 | } |
| 943 | |
| 944 | /* Unlock timer */ |
| 945 | static void unlock_timer(pjsip_transaction *tsx) |
| 946 | { |
| 947 | pj_mutex_unlock(tsx->mutex_b); |
| 948 | } |
| 949 | |
| 950 | /* Utility: schedule a timer */ |
| 951 | static pj_status_t tsx_schedule_timer(pjsip_transaction *tsx, |
| 952 | pj_timer_entry *entry, |
| 953 | const pj_time_val *delay, |
| 954 | int active_id) |
| 955 | { |
| 956 | pj_timer_heap_t *timer_heap = pjsip_endpt_get_timer_heap(tsx->endpt); |
| 957 | pj_status_t status; |
| 958 | |
| 959 | pj_assert(active_id != 0); |
| 960 | status = pj_timer_heap_schedule_w_grp_lock(timer_heap, entry, |
| 961 | delay, active_id, |
| 962 | tsx->grp_lock); |
| 963 | |
| 964 | return status; |
| 965 | } |
| 966 | |
| 967 | /* Utility: cancel a timer */ |
| 968 | static int tsx_cancel_timer(pjsip_transaction *tsx, |
| 969 | pj_timer_entry *entry) |
| 970 | { |
| 971 | pj_timer_heap_t *timer_heap = pjsip_endpt_get_timer_heap(tsx->endpt); |
| 972 | return pj_timer_heap_cancel_if_active(timer_heap, entry, TIMER_INACTIVE); |
| 973 | } |
| 974 | |
| 975 | /* Create and initialize basic transaction structure. |
| 976 | * This function is called by both UAC and UAS creation. |
| 977 | */ |
| 978 | static pj_status_t tsx_create( pjsip_module *tsx_user, |
| 979 | pj_grp_lock_t *grp_lock, |
| 980 | pjsip_transaction **p_tsx) |
| 981 | { |
| 982 | pj_pool_t *pool; |
| 983 | pjsip_transaction *tsx; |
| 984 | pj_status_t status; |
| 985 | |
| 986 | pool = pjsip_endpt_create_pool( mod_tsx_layer.endpt, "tsx", |
| 987 | PJSIP_POOL_TSX_LEN, PJSIP_POOL_TSX_INC ); |
| 988 | if (!pool) |
| 989 | return PJ_ENOMEM; |
| 990 | |
| 991 | tsx = PJ_POOL_ZALLOC_T(pool, pjsip_transaction); |
| 992 | tsx->pool = pool; |
| 993 | tsx->tsx_user = tsx_user; |
| 994 | tsx->endpt = mod_tsx_layer.endpt; |
| 995 | |
| 996 | pj_ansi_snprintf(tsx->obj_name, sizeof(tsx->obj_name), |
| 997 | "tsx%p", tsx); |
| 998 | pj_memcpy(pool->obj_name, tsx->obj_name, sizeof(pool->obj_name)); |
| 999 | |
| 1000 | tsx->handle_200resp = 1; |
| 1001 | tsx->retransmit_timer.id = TIMER_INACTIVE; |
| 1002 | tsx->retransmit_timer.user_data = tsx; |
| 1003 | tsx->retransmit_timer.cb = &tsx_timer_callback; |
| 1004 | tsx->timeout_timer.id = TIMER_INACTIVE; |
| 1005 | tsx->timeout_timer.user_data = tsx; |
| 1006 | tsx->timeout_timer.cb = &tsx_timer_callback; |
| 1007 | |
| 1008 | if (grp_lock) { |
| 1009 | tsx->grp_lock = grp_lock; |
| 1010 | } else { |
| 1011 | status = pj_grp_lock_create(pool, NULL, &tsx->grp_lock); |
| 1012 | if (status != PJ_SUCCESS) { |
| 1013 | pjsip_endpt_release_pool(mod_tsx_layer.endpt, pool); |
| 1014 | return status; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | pj_grp_lock_add_ref(tsx->grp_lock); |
| 1019 | pj_grp_lock_add_handler(tsx->grp_lock, tsx->pool, tsx, &tsx_on_destroy); |
| 1020 | |
| 1021 | status = pj_mutex_create_simple(pool, tsx->obj_name, &tsx->mutex_b); |
| 1022 | if (status != PJ_SUCCESS) { |
| 1023 | tsx_shutdown(tsx); |
| 1024 | return status; |
| 1025 | } |
| 1026 | |
| 1027 | *p_tsx = tsx; |
| 1028 | return PJ_SUCCESS; |
| 1029 | } |
| 1030 | |
| 1031 | /* Really destroy transaction, when grp_lock reference is zero */ |
| 1032 | static void tsx_on_destroy( void *arg ) |
| 1033 | { |
| 1034 | pjsip_transaction *tsx = (pjsip_transaction*)arg; |
| 1035 | |
| 1036 | PJ_LOG(5,(tsx->obj_name, "Transaction destroyed!")); |
| 1037 | |
| 1038 | pj_mutex_destroy(tsx->mutex_b); |
| 1039 | pjsip_endpt_release_pool(tsx->endpt, tsx->pool); |
| 1040 | } |
| 1041 | |
| 1042 | /* Shutdown transaction. */ |
| 1043 | static pj_status_t tsx_shutdown( pjsip_transaction *tsx ) |
| 1044 | { |
| 1045 | /* Release the transport */ |
| 1046 | tsx_update_transport(tsx, NULL); |
| 1047 | |
| 1048 | /* Decrement reference counter in transport selector, only if |
| 1049 | * we haven't been called before */ |
| 1050 | if (!tsx->terminating) { |
| 1051 | pjsip_tpselector_dec_ref(&tsx->tp_sel); |
| 1052 | } |
| 1053 | |
| 1054 | /* Free last transmitted message. */ |
| 1055 | if (tsx->last_tx) { |
| 1056 | pjsip_tx_data_dec_ref( tsx->last_tx ); |
| 1057 | tsx->last_tx = NULL; |
| 1058 | } |
| 1059 | /* Cancel timeout timer. */ |
| 1060 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1061 | |
| 1062 | /* Cancel retransmission timer. */ |
| 1063 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 1064 | |
| 1065 | /* Clear some pending flags. */ |
| 1066 | tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED | TSX_HAS_PENDING_SEND); |
| 1067 | |
| 1068 | |
| 1069 | /* Refuse to destroy transaction if it has pending resolving. */ |
| 1070 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 1071 | tsx->transport_flag |= TSX_HAS_PENDING_DESTROY; |
| 1072 | tsx->tsx_user = NULL; |
| 1073 | PJ_LOG(4,(tsx->obj_name, "Will destroy later because transport is " |
| 1074 | "in progress")); |
| 1075 | } |
| 1076 | |
| 1077 | if (!tsx->terminating) { |
| 1078 | tsx->terminating = PJ_TRUE; |
| 1079 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 1080 | } |
| 1081 | |
| 1082 | /* No acccess to tsx after this, it may have been destroyed */ |
| 1083 | |
| 1084 | return PJ_SUCCESS; |
| 1085 | } |
| 1086 | |
| 1087 | |
| 1088 | /* |
| 1089 | * Callback when timer expires. Transport error also piggybacks this event |
| 1090 | * to avoid deadlock (https://trac.pjsip.org/repos/ticket/1646). |
| 1091 | */ |
| 1092 | static void tsx_timer_callback( pj_timer_heap_t *theap, pj_timer_entry *entry) |
| 1093 | { |
| 1094 | pjsip_transaction *tsx = (pjsip_transaction*) entry->user_data; |
| 1095 | |
| 1096 | PJ_UNUSED_ARG(theap); |
| 1097 | |
| 1098 | if (entry->id == TRANSPORT_ERR_TIMER) { |
| 1099 | /* Posted transport error event */ |
| 1100 | entry->id = 0; |
| 1101 | if (tsx->state < PJSIP_TSX_STATE_TERMINATED) { |
| 1102 | pjsip_tsx_state_e prev_state; |
| 1103 | |
| 1104 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1105 | prev_state = tsx->state; |
| 1106 | |
| 1107 | /* Release transport as it's no longer working. */ |
| 1108 | tsx_update_transport(tsx, NULL); |
| 1109 | |
| 1110 | if (tsx->status_code < 200) { |
| 1111 | pj_str_t err; |
| 1112 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 1113 | |
| 1114 | err = pj_strerror(tsx->transport_err, errmsg, sizeof(errmsg)); |
| 1115 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TRANSPORT_ERROR, &err); |
| 1116 | } |
| 1117 | |
| 1118 | /* Set transaction state etc, but don't notify TU now, |
| 1119 | * otherwise we'll get a deadlock. See: |
| 1120 | * https://trac.pjsip.org/repos/ticket/1646 |
| 1121 | */ |
| 1122 | tsx_set_state_no_notify( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 1123 | PJSIP_EVENT_TRANSPORT_ERROR, NULL); |
| 1124 | pj_grp_lock_release(tsx->grp_lock); |
| 1125 | |
| 1126 | /* Now notify TU about state change, WITHOUT holding the |
| 1127 | * group lock. It should be safe to do so; transaction will |
| 1128 | * not get destroyed because group lock reference counter |
| 1129 | * has been incremented by the timer heap. |
| 1130 | */ |
| 1131 | if (tsx->tsx_user && tsx->tsx_user->on_tsx_state) { |
| 1132 | pjsip_event e; |
| 1133 | PJSIP_EVENT_INIT_TSX_STATE(e, tsx, |
| 1134 | PJSIP_EVENT_TRANSPORT_ERROR, NULL, |
| 1135 | prev_state); |
| 1136 | (*tsx->tsx_user->on_tsx_state)(tsx, &e); |
| 1137 | } |
| 1138 | } |
| 1139 | } else { |
| 1140 | pjsip_event event; |
| 1141 | |
| 1142 | entry->id = 0; |
| 1143 | |
| 1144 | PJ_LOG(5,(tsx->obj_name, "%s timer event", |
| 1145 | (entry==&tsx->retransmit_timer ? "Retransmit":"Timeout"))); |
| 1146 | pj_log_push_indent(); |
| 1147 | |
| 1148 | |
| 1149 | PJSIP_EVENT_INIT_TIMER(event, entry); |
| 1150 | |
| 1151 | /* Dispatch event to transaction. */ |
| 1152 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1153 | (*tsx->state_handler)(tsx, &event); |
| 1154 | pj_grp_lock_release(tsx->grp_lock); |
| 1155 | |
| 1156 | pj_log_pop_indent(); |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | |
| 1161 | /* |
| 1162 | * Set transaction state, and inform TU about the transaction state change. |
| 1163 | */ |
| 1164 | static void tsx_set_state( pjsip_transaction *tsx, |
| 1165 | pjsip_tsx_state_e state, |
| 1166 | pjsip_event_id_e event_src_type, |
| 1167 | void *event_src ) |
| 1168 | { |
| 1169 | pjsip_tsx_state_e prev_state = tsx->state; |
| 1170 | |
| 1171 | /* New state must be greater than previous state */ |
| 1172 | pj_assert(state >= tsx->state); |
| 1173 | |
| 1174 | PJ_LOG(5, (tsx->obj_name, "State changed from %s to %s, event=%s", |
| 1175 | state_str[tsx->state], state_str[state], |
| 1176 | pjsip_event_str(event_src_type))); |
| 1177 | pj_log_push_indent(); |
| 1178 | |
| 1179 | /* Change state. */ |
| 1180 | tsx->state = state; |
| 1181 | |
| 1182 | /* Update the state handlers. */ |
| 1183 | if (tsx->role == PJSIP_ROLE_UAC) { |
| 1184 | tsx->state_handler = tsx_state_handler_uac[state]; |
| 1185 | } else { |
| 1186 | tsx->state_handler = tsx_state_handler_uas[state]; |
| 1187 | } |
| 1188 | |
| 1189 | /* Before informing TU about state changed, inform TU about |
| 1190 | * rx event. |
| 1191 | */ |
| 1192 | if (event_src_type==PJSIP_EVENT_RX_MSG && tsx->tsx_user) { |
| 1193 | pjsip_rx_data *rdata = (pjsip_rx_data*) event_src; |
| 1194 | |
| 1195 | pj_assert(rdata != NULL); |
| 1196 | |
| 1197 | if (rdata->msg_info.msg->type == PJSIP_RESPONSE_MSG && |
| 1198 | tsx->tsx_user->on_rx_response) |
| 1199 | { |
| 1200 | (*tsx->tsx_user->on_rx_response)(rdata); |
| 1201 | } |
| 1202 | |
| 1203 | } |
| 1204 | |
| 1205 | /* Inform TU about state changed. */ |
| 1206 | if (tsx->tsx_user && tsx->tsx_user->on_tsx_state) { |
| 1207 | pjsip_event e; |
| 1208 | PJSIP_EVENT_INIT_TSX_STATE(e, tsx, event_src_type, event_src, |
| 1209 | prev_state); |
| 1210 | (*tsx->tsx_user->on_tsx_state)(tsx, &e); |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | /* When the transaction is terminated, release transport, and free the |
| 1215 | * saved last transmitted message. |
| 1216 | */ |
| 1217 | if (state == PJSIP_TSX_STATE_TERMINATED) { |
| 1218 | pj_time_val timeout = {0, 0}; |
| 1219 | |
| 1220 | /* If we're still waiting for a message to be sent.. */ |
| 1221 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 1222 | /* Disassociate ourselves from the outstanding transmit data |
| 1223 | * so that when the send callback is called we will be able |
| 1224 | * to ignore that (otherwise we'll get assertion, see |
| 1225 | * http://trac.pjsip.org/repos/ticket/1033) |
| 1226 | */ |
| 1227 | if (tsx->pending_tx) { |
| 1228 | tsx->pending_tx->mod_data[mod_tsx_layer.mod.id] = NULL; |
| 1229 | tsx->pending_tx = NULL; |
| 1230 | } |
| 1231 | tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| 1232 | } |
| 1233 | |
| 1234 | lock_timer(tsx); |
| 1235 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1236 | tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| 1237 | unlock_timer(tsx); |
| 1238 | |
| 1239 | } else if (state == PJSIP_TSX_STATE_DESTROYED) { |
| 1240 | |
| 1241 | /* Unregister transaction. */ |
| 1242 | mod_tsx_layer_unregister_tsx(tsx); |
| 1243 | |
| 1244 | /* Destroy transaction. */ |
| 1245 | tsx_shutdown(tsx); |
| 1246 | } |
| 1247 | |
| 1248 | pj_log_pop_indent(); |
| 1249 | } |
| 1250 | |
| 1251 | /* Set transaction state without notifying tsx_user */ |
| 1252 | static void tsx_set_state_no_notify( pjsip_transaction *tsx, |
| 1253 | pjsip_tsx_state_e state, |
| 1254 | pjsip_event_id_e event_src_type, |
| 1255 | void *event_src ) |
| 1256 | { |
| 1257 | pjsip_module *tsx_user = tsx->tsx_user; |
| 1258 | tsx->tsx_user = NULL; |
| 1259 | tsx_set_state(tsx, state, event_src_type, event_src); |
| 1260 | tsx->tsx_user = tsx_user; |
| 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * Create, initialize, and register UAC transaction. |
| 1265 | */ |
| 1266 | PJ_DEF(pj_status_t) pjsip_tsx_create_uac( pjsip_module *tsx_user, |
| 1267 | pjsip_tx_data *tdata, |
| 1268 | pjsip_transaction **p_tsx) |
| 1269 | { |
| 1270 | return pjsip_tsx_create_uac2(tsx_user, tdata, NULL, p_tsx); |
| 1271 | } |
| 1272 | |
| 1273 | PJ_DEF(pj_status_t) pjsip_tsx_create_uac2(pjsip_module *tsx_user, |
| 1274 | pjsip_tx_data *tdata, |
| 1275 | pj_grp_lock_t *grp_lock, |
| 1276 | pjsip_transaction **p_tsx) |
| 1277 | { |
| 1278 | pjsip_transaction *tsx; |
| 1279 | pjsip_msg *msg; |
| 1280 | pjsip_cseq_hdr *cseq; |
| 1281 | pjsip_via_hdr *via; |
| 1282 | pjsip_host_info dst_info; |
| 1283 | pj_status_t status; |
| 1284 | |
| 1285 | /* Validate arguments. */ |
| 1286 | PJ_ASSERT_RETURN(tdata && tdata->msg && p_tsx, PJ_EINVAL); |
| 1287 | PJ_ASSERT_RETURN(tdata->msg->type == PJSIP_REQUEST_MSG, |
| 1288 | PJSIP_ENOTREQUESTMSG); |
| 1289 | |
| 1290 | /* Method MUST NOT be ACK! */ |
| 1291 | PJ_ASSERT_RETURN(tdata->msg->line.req.method.id != PJSIP_ACK_METHOD, |
| 1292 | PJ_EINVALIDOP); |
| 1293 | |
| 1294 | /* Keep shortcut */ |
| 1295 | msg = tdata->msg; |
| 1296 | |
| 1297 | /* Make sure CSeq header is present. */ |
| 1298 | cseq = (pjsip_cseq_hdr*) pjsip_msg_find_hdr(msg, PJSIP_H_CSEQ, NULL); |
| 1299 | if (!cseq) { |
| 1300 | pj_assert(!"CSeq header not present in outgoing message!"); |
| 1301 | return PJSIP_EMISSINGHDR; |
| 1302 | } |
| 1303 | |
| 1304 | |
| 1305 | /* Create transaction instance. */ |
| 1306 | status = tsx_create( tsx_user, grp_lock, &tsx); |
| 1307 | if (status != PJ_SUCCESS) |
| 1308 | return status; |
| 1309 | |
| 1310 | |
| 1311 | /* Lock transaction. */ |
| 1312 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1313 | |
| 1314 | /* Role is UAC. */ |
| 1315 | tsx->role = PJSIP_ROLE_UAC; |
| 1316 | |
| 1317 | /* Save method. */ |
| 1318 | pjsip_method_copy( tsx->pool, &tsx->method, &msg->line.req.method); |
| 1319 | |
| 1320 | /* Save CSeq. */ |
| 1321 | tsx->cseq = cseq->cseq; |
| 1322 | |
| 1323 | /* Generate Via header if it doesn't exist. */ |
| 1324 | via = (pjsip_via_hdr*) pjsip_msg_find_hdr(msg, PJSIP_H_VIA, NULL); |
| 1325 | if (via == NULL) { |
| 1326 | via = pjsip_via_hdr_create(tdata->pool); |
| 1327 | pjsip_msg_insert_first_hdr(msg, (pjsip_hdr*) via); |
| 1328 | } |
| 1329 | |
| 1330 | /* Generate branch parameter if it doesn't exist. */ |
| 1331 | if (via->branch_param.slen == 0) { |
| 1332 | pj_str_t tmp; |
| 1333 | via->branch_param.ptr = (char*) |
| 1334 | pj_pool_alloc(tsx->pool, PJSIP_MAX_BRANCH_LEN); |
| 1335 | via->branch_param.slen = PJSIP_MAX_BRANCH_LEN; |
| 1336 | pj_memcpy(via->branch_param.ptr, PJSIP_RFC3261_BRANCH_ID, |
| 1337 | PJSIP_RFC3261_BRANCH_LEN); |
| 1338 | tmp.ptr = via->branch_param.ptr + PJSIP_RFC3261_BRANCH_LEN + 2; |
| 1339 | *(tmp.ptr-2) = 80; *(tmp.ptr-1) = 106; |
| 1340 | pj_generate_unique_string( &tmp ); |
| 1341 | |
| 1342 | /* Save branch parameter. */ |
| 1343 | tsx->branch = via->branch_param; |
| 1344 | |
| 1345 | } else { |
| 1346 | /* Copy branch parameter. */ |
| 1347 | pj_strdup(tsx->pool, &tsx->branch, &via->branch_param); |
| 1348 | } |
| 1349 | |
| 1350 | /* Generate transaction key. */ |
| 1351 | create_tsx_key_3261( tsx->pool, &tsx->transaction_key, |
| 1352 | PJSIP_ROLE_UAC, &tsx->method, |
| 1353 | &via->branch_param); |
| 1354 | |
| 1355 | /* Calculate hashed key value. */ |
| 1356 | #ifdef PRECALC_HASH |
| 1357 | tsx->hashed_key = pj_hash_calc_tolower(0, NULL, &tsx->transaction_key); |
| 1358 | #endif |
| 1359 | |
| 1360 | PJ_LOG(6, (tsx->obj_name, "tsx_key=%.*s", tsx->transaction_key.slen, |
| 1361 | tsx->transaction_key.ptr)); |
| 1362 | |
| 1363 | /* Begin with State_Null. |
| 1364 | * Manually set-up the state becase we don't want to call the callback. |
| 1365 | */ |
| 1366 | tsx->state = PJSIP_TSX_STATE_NULL; |
| 1367 | tsx->state_handler = &tsx_on_state_null; |
| 1368 | |
| 1369 | /* Save the message. */ |
| 1370 | tsx->last_tx = tdata; |
| 1371 | pjsip_tx_data_add_ref(tsx->last_tx); |
| 1372 | |
| 1373 | /* Determine whether reliable transport should be used initially. |
| 1374 | * This will be updated whenever transport has changed. |
| 1375 | */ |
| 1376 | status = pjsip_get_request_dest(tdata, &dst_info); |
| 1377 | if (status != PJ_SUCCESS) { |
| 1378 | pj_grp_lock_release(tsx->grp_lock); |
| 1379 | tsx_shutdown(tsx); |
| 1380 | return status; |
| 1381 | } |
| 1382 | tsx->is_reliable = (dst_info.flag & PJSIP_TRANSPORT_RELIABLE); |
| 1383 | |
| 1384 | /* Register transaction to hash table. */ |
| 1385 | status = mod_tsx_layer_register_tsx(tsx); |
| 1386 | if (status != PJ_SUCCESS) { |
| 1387 | /* The assertion is removed by #1090: |
| 1388 | pj_assert(!"Bug in branch_param generator (i.e. not unique)"); |
| 1389 | */ |
| 1390 | pj_grp_lock_release(tsx->grp_lock); |
| 1391 | tsx_shutdown(tsx); |
| 1392 | return status; |
| 1393 | } |
| 1394 | |
| 1395 | |
| 1396 | /* Unlock transaction and return. */ |
| 1397 | pj_grp_lock_release(tsx->grp_lock); |
| 1398 | |
| 1399 | pj_log_push_indent(); |
| 1400 | PJ_LOG(5,(tsx->obj_name, "Transaction created for %s", |
| 1401 | pjsip_tx_data_get_info(tdata))); |
| 1402 | pj_log_pop_indent(); |
| 1403 | |
| 1404 | *p_tsx = tsx; |
| 1405 | return PJ_SUCCESS; |
| 1406 | } |
| 1407 | |
| 1408 | |
| 1409 | /* |
| 1410 | * Create, initialize, and register UAS transaction. |
| 1411 | */ |
| 1412 | PJ_DEF(pj_status_t) pjsip_tsx_create_uas( pjsip_module *tsx_user, |
| 1413 | pjsip_rx_data *rdata, |
| 1414 | pjsip_transaction **p_tsx) |
| 1415 | { |
| 1416 | return pjsip_tsx_create_uas2(tsx_user, rdata, NULL, p_tsx); |
| 1417 | } |
| 1418 | |
| 1419 | PJ_DEF(pj_status_t) pjsip_tsx_create_uas2(pjsip_module *tsx_user, |
| 1420 | pjsip_rx_data *rdata, |
| 1421 | pj_grp_lock_t *grp_lock, |
| 1422 | pjsip_transaction **p_tsx) |
| 1423 | { |
| 1424 | pjsip_transaction *tsx; |
| 1425 | pjsip_msg *msg; |
| 1426 | pj_str_t *branch; |
| 1427 | pjsip_cseq_hdr *cseq; |
| 1428 | pj_status_t status; |
| 1429 | |
| 1430 | /* Validate arguments. */ |
| 1431 | PJ_ASSERT_RETURN(rdata && rdata->msg_info.msg && p_tsx, PJ_EINVAL); |
| 1432 | |
| 1433 | /* Keep shortcut to message */ |
| 1434 | msg = rdata->msg_info.msg; |
| 1435 | |
| 1436 | /* Make sure this is a request message. */ |
| 1437 | PJ_ASSERT_RETURN(msg->type == PJSIP_REQUEST_MSG, PJSIP_ENOTREQUESTMSG); |
| 1438 | |
| 1439 | /* Make sure method is not ACK */ |
| 1440 | PJ_ASSERT_RETURN(msg->line.req.method.id != PJSIP_ACK_METHOD, |
| 1441 | PJ_EINVALIDOP); |
| 1442 | |
| 1443 | /* Make sure CSeq header is present. */ |
| 1444 | cseq = rdata->msg_info.cseq; |
| 1445 | if (!cseq) |
| 1446 | return PJSIP_EMISSINGHDR; |
| 1447 | |
| 1448 | /* Make sure Via header is present. */ |
| 1449 | if (rdata->msg_info.via == NULL) |
| 1450 | return PJSIP_EMISSINGHDR; |
| 1451 | |
| 1452 | /* Check that method in CSeq header match request method. |
| 1453 | * Reference: PROTOS #1922 |
| 1454 | */ |
| 1455 | if (pjsip_method_cmp(&msg->line.req.method, |
| 1456 | &rdata->msg_info.cseq->method) != 0) |
| 1457 | { |
| 1458 | PJ_LOG(4,(THIS_FILE, "Error: CSeq header contains different " |
| 1459 | "method than the request line")); |
| 1460 | return PJSIP_EINVALIDHDR; |
| 1461 | } |
| 1462 | |
| 1463 | /* |
| 1464 | * Create transaction instance. |
| 1465 | */ |
| 1466 | status = tsx_create( tsx_user, grp_lock, &tsx); |
| 1467 | if (status != PJ_SUCCESS) |
| 1468 | return status; |
| 1469 | |
| 1470 | |
| 1471 | /* Lock transaction. */ |
| 1472 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1473 | |
| 1474 | /* Role is UAS */ |
| 1475 | tsx->role = PJSIP_ROLE_UAS; |
| 1476 | |
| 1477 | /* Save method. */ |
| 1478 | pjsip_method_copy( tsx->pool, &tsx->method, &msg->line.req.method); |
| 1479 | |
| 1480 | /* Save CSeq */ |
| 1481 | tsx->cseq = cseq->cseq; |
| 1482 | |
| 1483 | /* Get transaction key either from branch for RFC3261 message, or |
| 1484 | * create transaction key. |
| 1485 | */ |
| 1486 | status = pjsip_tsx_create_key(tsx->pool, &tsx->transaction_key, |
| 1487 | PJSIP_ROLE_UAS, &tsx->method, rdata); |
| 1488 | if (status != PJ_SUCCESS) { |
| 1489 | pj_grp_lock_release(tsx->grp_lock); |
| 1490 | tsx_shutdown(tsx); |
| 1491 | return status; |
| 1492 | } |
| 1493 | |
| 1494 | /* Calculate hashed key value. */ |
| 1495 | #ifdef PRECALC_HASH |
| 1496 | tsx->hashed_key = pj_hash_calc_tolower(0, NULL, &tsx->transaction_key); |
| 1497 | #endif |
| 1498 | |
| 1499 | /* Duplicate branch parameter for transaction. */ |
| 1500 | branch = &rdata->msg_info.via->branch_param; |
| 1501 | pj_strdup(tsx->pool, &tsx->branch, branch); |
| 1502 | |
| 1503 | PJ_LOG(6, (tsx->obj_name, "tsx_key=%.*s", tsx->transaction_key.slen, |
| 1504 | tsx->transaction_key.ptr)); |
| 1505 | |
| 1506 | |
| 1507 | /* Begin with state NULL. |
| 1508 | * Manually set-up the state becase we don't want to call the callback. |
| 1509 | */ |
| 1510 | tsx->state = PJSIP_TSX_STATE_NULL; |
| 1511 | tsx->state_handler = &tsx_on_state_null; |
| 1512 | |
| 1513 | /* Get response address. */ |
| 1514 | status = pjsip_get_response_addr( tsx->pool, rdata, &tsx->res_addr ); |
| 1515 | if (status != PJ_SUCCESS) { |
| 1516 | pj_grp_lock_release(tsx->grp_lock); |
| 1517 | tsx_shutdown(tsx); |
| 1518 | return status; |
| 1519 | } |
| 1520 | |
| 1521 | /* If it's decided that we should use current transport, keep the |
| 1522 | * transport. |
| 1523 | */ |
| 1524 | if (tsx->res_addr.transport) { |
| 1525 | tsx_update_transport(tsx, tsx->res_addr.transport); |
| 1526 | pj_memcpy(&tsx->addr, &tsx->res_addr.addr, tsx->res_addr.addr_len); |
| 1527 | tsx->addr_len = tsx->res_addr.addr_len; |
| 1528 | tsx->is_reliable = PJSIP_TRANSPORT_IS_RELIABLE(tsx->transport); |
| 1529 | } else { |
| 1530 | tsx->is_reliable = |
| 1531 | (tsx->res_addr.dst_host.flag & PJSIP_TRANSPORT_RELIABLE); |
| 1532 | } |
| 1533 | |
| 1534 | |
| 1535 | /* Register the transaction. */ |
| 1536 | status = mod_tsx_layer_register_tsx(tsx); |
| 1537 | if (status != PJ_SUCCESS) { |
| 1538 | pj_grp_lock_release(tsx->grp_lock); |
| 1539 | tsx_shutdown(tsx); |
| 1540 | return status; |
| 1541 | } |
| 1542 | |
| 1543 | /* Put this transaction in rdata's mod_data. */ |
| 1544 | rdata->endpt_info.mod_data[mod_tsx_layer.mod.id] = tsx; |
| 1545 | |
| 1546 | /* Unlock transaction and return. */ |
| 1547 | pj_grp_lock_release(tsx->grp_lock); |
| 1548 | |
| 1549 | pj_log_push_indent(); |
| 1550 | PJ_LOG(5,(tsx->obj_name, "Transaction created for %s", |
| 1551 | pjsip_rx_data_get_info(rdata))); |
| 1552 | pj_log_pop_indent(); |
| 1553 | |
| 1554 | |
| 1555 | *p_tsx = tsx; |
| 1556 | return PJ_SUCCESS; |
| 1557 | } |
| 1558 | |
| 1559 | |
| 1560 | /* |
| 1561 | * Bind transaction to a specific transport/listener. |
| 1562 | */ |
| 1563 | PJ_DEF(pj_status_t) pjsip_tsx_set_transport(pjsip_transaction *tsx, |
| 1564 | const pjsip_tpselector *sel) |
| 1565 | { |
| 1566 | /* Must be UAC transaction */ |
| 1567 | PJ_ASSERT_RETURN(tsx && sel, PJ_EINVAL); |
| 1568 | |
| 1569 | /* Start locking the transaction. */ |
| 1570 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1571 | |
| 1572 | /* Decrement reference counter of previous transport selector */ |
| 1573 | pjsip_tpselector_dec_ref(&tsx->tp_sel); |
| 1574 | |
| 1575 | /* Copy transport selector structure .*/ |
| 1576 | pj_memcpy(&tsx->tp_sel, sel, sizeof(*sel)); |
| 1577 | |
| 1578 | /* Increment reference counter */ |
| 1579 | pjsip_tpselector_add_ref(&tsx->tp_sel); |
| 1580 | |
| 1581 | /* Unlock transaction. */ |
| 1582 | pj_grp_lock_release(tsx->grp_lock); |
| 1583 | |
| 1584 | return PJ_SUCCESS; |
| 1585 | } |
| 1586 | |
| 1587 | |
| 1588 | /* |
| 1589 | * Set transaction status code and reason. |
| 1590 | */ |
| 1591 | static void tsx_set_status_code(pjsip_transaction *tsx, |
| 1592 | int code, const pj_str_t *reason) |
| 1593 | { |
| 1594 | tsx->status_code = code; |
| 1595 | if (reason) |
| 1596 | pj_strdup(tsx->pool, &tsx->status_text, reason); |
| 1597 | else |
| 1598 | tsx->status_text = *pjsip_get_status_text(code); |
| 1599 | } |
| 1600 | |
| 1601 | |
| 1602 | /* |
| 1603 | * Forcely terminate transaction. |
| 1604 | */ |
| 1605 | PJ_DEF(pj_status_t) pjsip_tsx_terminate( pjsip_transaction *tsx, int code ) |
| 1606 | { |
| 1607 | PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| 1608 | |
| 1609 | PJ_LOG(5,(tsx->obj_name, "Request to terminate transaction")); |
| 1610 | |
| 1611 | PJ_ASSERT_RETURN(code >= 200, PJ_EINVAL); |
| 1612 | |
| 1613 | if (tsx->state >= PJSIP_TSX_STATE_TERMINATED) |
| 1614 | return PJ_SUCCESS; |
| 1615 | |
| 1616 | pj_log_push_indent(); |
| 1617 | |
| 1618 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1619 | tsx_set_status_code(tsx, code, NULL); |
| 1620 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, PJSIP_EVENT_USER, NULL); |
| 1621 | pj_grp_lock_release(tsx->grp_lock); |
| 1622 | |
| 1623 | pj_log_pop_indent(); |
| 1624 | |
| 1625 | return PJ_SUCCESS; |
| 1626 | } |
| 1627 | |
| 1628 | |
| 1629 | /* |
| 1630 | * Cease retransmission on the UAC transaction. The UAC transaction is |
| 1631 | * still considered running, and it will complete when either final |
| 1632 | * response is received or the transaction times out. |
| 1633 | */ |
| 1634 | PJ_DEF(pj_status_t) pjsip_tsx_stop_retransmit(pjsip_transaction *tsx) |
| 1635 | { |
| 1636 | PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| 1637 | PJ_ASSERT_RETURN(tsx->role == PJSIP_ROLE_UAC && |
| 1638 | tsx->method.id == PJSIP_INVITE_METHOD, |
| 1639 | PJ_EINVALIDOP); |
| 1640 | |
| 1641 | PJ_LOG(5,(tsx->obj_name, "Request to stop retransmission")); |
| 1642 | |
| 1643 | pj_log_push_indent(); |
| 1644 | |
| 1645 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1646 | /* Cancel retransmission timer. */ |
| 1647 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 1648 | pj_grp_lock_release(tsx->grp_lock); |
| 1649 | |
| 1650 | pj_log_pop_indent(); |
| 1651 | |
| 1652 | return PJ_SUCCESS; |
| 1653 | } |
| 1654 | |
| 1655 | |
| 1656 | /* |
| 1657 | * Start a timer to terminate transaction after the specified time |
| 1658 | * has elapsed. |
| 1659 | */ |
| 1660 | PJ_DEF(pj_status_t) pjsip_tsx_set_timeout( pjsip_transaction *tsx, |
| 1661 | unsigned millisec) |
| 1662 | { |
| 1663 | pj_time_val timeout; |
| 1664 | |
| 1665 | PJ_ASSERT_RETURN(tsx != NULL, PJ_EINVAL); |
| 1666 | PJ_ASSERT_RETURN(tsx->role == PJSIP_ROLE_UAC && |
| 1667 | tsx->method.id == PJSIP_INVITE_METHOD, |
| 1668 | PJ_EINVALIDOP); |
| 1669 | |
| 1670 | /* Note: must not call pj_grp_lock_acquire(tsx->grp_lock) as |
| 1671 | * that would introduce deadlock. See #1121. |
| 1672 | */ |
| 1673 | lock_timer(tsx); |
| 1674 | |
| 1675 | /* Transaction should normally not have final response, but as |
| 1676 | * #1121 says there is a (tolerable) window of race condition |
| 1677 | * where this might happen. |
| 1678 | */ |
| 1679 | if (tsx->status_code >= 200 && tsx->timeout_timer.id != 0) { |
| 1680 | /* Timeout is already set */ |
| 1681 | unlock_timer(tsx); |
| 1682 | return PJ_EEXISTS; |
| 1683 | } |
| 1684 | |
| 1685 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1686 | |
| 1687 | timeout.sec = 0; |
| 1688 | timeout.msec = millisec; |
| 1689 | pj_time_val_normalize(&timeout); |
| 1690 | |
| 1691 | tsx_schedule_timer(tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| 1692 | |
| 1693 | unlock_timer(tsx); |
| 1694 | |
| 1695 | return PJ_SUCCESS; |
| 1696 | } |
| 1697 | |
| 1698 | |
| 1699 | /* |
| 1700 | * This function is called by TU to send a message. |
| 1701 | */ |
| 1702 | PJ_DEF(pj_status_t) pjsip_tsx_send_msg( pjsip_transaction *tsx, |
| 1703 | pjsip_tx_data *tdata ) |
| 1704 | { |
| 1705 | pjsip_event event; |
| 1706 | pj_status_t status; |
| 1707 | |
| 1708 | if (tdata == NULL) |
| 1709 | tdata = tsx->last_tx; |
| 1710 | |
| 1711 | PJ_ASSERT_RETURN(tdata != NULL, PJ_EINVALIDOP); |
| 1712 | |
| 1713 | PJ_LOG(5,(tsx->obj_name, "Sending %s in state %s", |
| 1714 | pjsip_tx_data_get_info(tdata), |
| 1715 | state_str[tsx->state])); |
| 1716 | pj_log_push_indent(); |
| 1717 | |
| 1718 | PJSIP_EVENT_INIT_TX_MSG(event, tdata); |
| 1719 | |
| 1720 | /* Dispatch to transaction. */ |
| 1721 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1722 | |
| 1723 | /* Set transport selector to tdata */ |
| 1724 | pjsip_tx_data_set_transport(tdata, &tsx->tp_sel); |
| 1725 | |
| 1726 | /* Dispatch to state handler */ |
| 1727 | status = (*tsx->state_handler)(tsx, &event); |
| 1728 | |
| 1729 | pj_grp_lock_release(tsx->grp_lock); |
| 1730 | |
| 1731 | /* Only decrement reference counter when it returns success. |
| 1732 | * (This is the specification from the .PDF design document). |
| 1733 | */ |
| 1734 | if (status == PJ_SUCCESS) { |
| 1735 | pjsip_tx_data_dec_ref(tdata); |
| 1736 | } |
| 1737 | |
| 1738 | pj_log_pop_indent(); |
| 1739 | |
| 1740 | return status; |
| 1741 | } |
| 1742 | |
| 1743 | |
| 1744 | /* |
| 1745 | * This function is called by endpoint when incoming message for the |
| 1746 | * transaction is received. |
| 1747 | */ |
| 1748 | PJ_DEF(void) pjsip_tsx_recv_msg( pjsip_transaction *tsx, |
| 1749 | pjsip_rx_data *rdata) |
| 1750 | { |
| 1751 | pjsip_event event; |
| 1752 | |
| 1753 | PJ_LOG(5,(tsx->obj_name, "Incoming %s in state %s", |
| 1754 | pjsip_rx_data_get_info(rdata), state_str[tsx->state])); |
| 1755 | pj_log_push_indent(); |
| 1756 | |
| 1757 | /* Put the transaction in the rdata's mod_data. */ |
| 1758 | rdata->endpt_info.mod_data[mod_tsx_layer.mod.id] = tsx; |
| 1759 | |
| 1760 | /* Init event. */ |
| 1761 | PJSIP_EVENT_INIT_RX_MSG(event, rdata); |
| 1762 | |
| 1763 | /* Dispatch to transaction. */ |
| 1764 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1765 | (*tsx->state_handler)(tsx, &event); |
| 1766 | pj_grp_lock_release(tsx->grp_lock); |
| 1767 | |
| 1768 | pj_log_pop_indent(); |
| 1769 | } |
| 1770 | |
| 1771 | |
| 1772 | /* Callback called by send message framework */ |
| 1773 | static void send_msg_callback( pjsip_send_state *send_state, |
| 1774 | pj_ssize_t sent, pj_bool_t *cont ) |
| 1775 | { |
| 1776 | pjsip_transaction *tsx = (pjsip_transaction*) send_state->token; |
| 1777 | pjsip_tx_data *tdata = send_state->tdata; |
| 1778 | |
| 1779 | /* Check if transaction has cancelled itself from this transmit |
| 1780 | * notification (https://trac.pjsip.org/repos/ticket/1033). |
| 1781 | * Also check if the transaction layer itself may have been shutdown |
| 1782 | * (https://trac.pjsip.org/repos/ticket/1535) |
| 1783 | */ |
| 1784 | if (mod_tsx_layer.mod.id < 0 || |
| 1785 | tdata->mod_data[mod_tsx_layer.mod.id] == NULL) |
| 1786 | { |
| 1787 | *cont = PJ_FALSE; |
| 1788 | return; |
| 1789 | } |
| 1790 | |
| 1791 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1792 | |
| 1793 | /* Reset */ |
| 1794 | tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| 1795 | tsx->pending_tx = NULL; |
| 1796 | |
| 1797 | if (sent > 0) { |
| 1798 | /* Successfully sent! */ |
| 1799 | pj_assert(send_state->cur_transport != NULL); |
| 1800 | |
| 1801 | if (tsx->transport != send_state->cur_transport) { |
| 1802 | /* Update transport. */ |
| 1803 | tsx_update_transport(tsx, send_state->cur_transport); |
| 1804 | |
| 1805 | /* Update remote address. */ |
| 1806 | tsx->addr_len = tdata->dest_info.addr.entry[tdata->dest_info.cur_addr].addr_len; |
| 1807 | pj_memcpy(&tsx->addr, |
| 1808 | &tdata->dest_info.addr.entry[tdata->dest_info.cur_addr].addr, |
| 1809 | tsx->addr_len); |
| 1810 | |
| 1811 | /* Update is_reliable flag. */ |
| 1812 | tsx->is_reliable = PJSIP_TRANSPORT_IS_RELIABLE(tsx->transport); |
| 1813 | } |
| 1814 | |
| 1815 | /* Clear pending transport flag. */ |
| 1816 | tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| 1817 | |
| 1818 | /* Mark that we have resolved the addresses. */ |
| 1819 | tsx->transport_flag |= TSX_HAS_RESOLVED_SERVER; |
| 1820 | |
| 1821 | /* Pending destroy? */ |
| 1822 | if (tsx->transport_flag & TSX_HAS_PENDING_DESTROY) { |
| 1823 | tsx_set_state( tsx, PJSIP_TSX_STATE_DESTROYED, |
| 1824 | PJSIP_EVENT_UNKNOWN, NULL ); |
| 1825 | pj_grp_lock_release(tsx->grp_lock); |
| 1826 | return; |
| 1827 | } |
| 1828 | |
| 1829 | /* Need to transmit a message? */ |
| 1830 | if (tsx->transport_flag & TSX_HAS_PENDING_SEND) { |
| 1831 | tsx->transport_flag &= ~(TSX_HAS_PENDING_SEND); |
| 1832 | tsx_send_msg(tsx, tsx->last_tx); |
| 1833 | } |
| 1834 | |
| 1835 | /* Need to reschedule retransmission? */ |
| 1836 | if (tsx->transport_flag & TSX_HAS_PENDING_RESCHED) { |
| 1837 | tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| 1838 | |
| 1839 | /* Only update when transport turns out to be unreliable. */ |
| 1840 | if (!tsx->is_reliable) { |
| 1841 | tsx_resched_retransmission(tsx); |
| 1842 | } |
| 1843 | } |
| 1844 | |
| 1845 | } else { |
| 1846 | /* Failed to send! */ |
| 1847 | pj_assert(sent != 0); |
| 1848 | |
| 1849 | /* If transaction is using the same transport as the failed one, |
| 1850 | * release the transport. |
| 1851 | */ |
| 1852 | if (send_state->cur_transport==tsx->transport) |
| 1853 | tsx_update_transport(tsx, NULL); |
| 1854 | |
| 1855 | /* Also stop processing if transaction has been flagged with |
| 1856 | * pending destroy (http://trac.pjsip.org/repos/ticket/906) |
| 1857 | */ |
| 1858 | if ((!*cont) || (tsx->transport_flag & TSX_HAS_PENDING_DESTROY)) { |
| 1859 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 1860 | pjsip_status_code sc; |
| 1861 | pj_str_t err; |
| 1862 | |
| 1863 | tsx->transport_err = (pj_status_t)-sent; |
| 1864 | |
| 1865 | err =pj_strerror((pj_status_t)-sent, errmsg, sizeof(errmsg)); |
| 1866 | |
| 1867 | PJ_LOG(2,(tsx->obj_name, |
| 1868 | "Failed to send %s! err=%d (%s)", |
| 1869 | pjsip_tx_data_get_info(send_state->tdata), -sent, |
| 1870 | errmsg)); |
| 1871 | |
| 1872 | /* Clear pending transport flag. */ |
| 1873 | tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| 1874 | |
| 1875 | /* Mark that we have resolved the addresses. */ |
| 1876 | tsx->transport_flag |= TSX_HAS_RESOLVED_SERVER; |
| 1877 | |
| 1878 | /* Server resolution error is now mapped to 502 instead of 503, |
| 1879 | * since with 503 normally client should try again. |
| 1880 | * See http://trac.pjsip.org/repos/ticket/870 |
| 1881 | */ |
| 1882 | if (-sent==PJ_ERESOLVE || -sent==PJLIB_UTIL_EDNS_NXDOMAIN) |
| 1883 | sc = PJSIP_SC_BAD_GATEWAY; |
| 1884 | else |
| 1885 | sc = PJSIP_SC_TSX_TRANSPORT_ERROR; |
| 1886 | |
| 1887 | /* Terminate transaction, if it's not already terminated. */ |
| 1888 | tsx_set_status_code(tsx, sc, &err); |
| 1889 | if (tsx->state != PJSIP_TSX_STATE_TERMINATED && |
| 1890 | tsx->state != PJSIP_TSX_STATE_DESTROYED) |
| 1891 | { |
| 1892 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 1893 | PJSIP_EVENT_TRANSPORT_ERROR, send_state->tdata); |
| 1894 | } |
| 1895 | /* Don't forget to destroy if we have pending destroy flag |
| 1896 | * (http://trac.pjsip.org/repos/ticket/906) |
| 1897 | */ |
| 1898 | else if (tsx->transport_flag & TSX_HAS_PENDING_DESTROY) |
| 1899 | { |
| 1900 | tsx_set_state( tsx, PJSIP_TSX_STATE_DESTROYED, |
| 1901 | PJSIP_EVENT_TRANSPORT_ERROR, send_state->tdata); |
| 1902 | } |
| 1903 | |
| 1904 | } else { |
| 1905 | PJ_PERROR(2,(tsx->obj_name, (pj_status_t)-sent, |
| 1906 | "Temporary failure in sending %s, " |
| 1907 | "will try next server", |
| 1908 | pjsip_tx_data_get_info(send_state->tdata))); |
| 1909 | |
| 1910 | /* Reset retransmission count */ |
| 1911 | tsx->retransmit_count = 0; |
| 1912 | |
| 1913 | /* And reset timeout timer */ |
| 1914 | if (tsx->timeout_timer.id) { |
| 1915 | lock_timer(tsx); |
| 1916 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1917 | tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| 1918 | &timeout_timer_val, TIMEOUT_TIMER); |
| 1919 | unlock_timer(tsx); |
| 1920 | } |
| 1921 | |
| 1922 | /* Put again pending tdata */ |
| 1923 | tdata->mod_data[mod_tsx_layer.mod.id] = tsx; |
| 1924 | tsx->pending_tx = tdata; |
| 1925 | } |
| 1926 | } |
| 1927 | |
| 1928 | pj_grp_lock_release(tsx->grp_lock); |
| 1929 | } |
| 1930 | |
| 1931 | |
| 1932 | /* Transport callback. */ |
| 1933 | static void transport_callback(void *token, pjsip_tx_data *tdata, |
| 1934 | pj_ssize_t sent) |
| 1935 | { |
| 1936 | pjsip_transaction *tsx = (pjsip_transaction*) token; |
| 1937 | |
| 1938 | /* In other circumstances, locking tsx->grp_lock AFTER transport mutex |
| 1939 | * will introduce deadlock if another thread is currently sending a |
| 1940 | * SIP message to the transport. But this should be safe as there should |
| 1941 | * be no way this callback could be called while another thread is |
| 1942 | * sending a message. |
| 1943 | */ |
| 1944 | pj_grp_lock_acquire(tsx->grp_lock); |
| 1945 | tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| 1946 | pj_grp_lock_release(tsx->grp_lock); |
| 1947 | |
| 1948 | if (sent < 0) { |
| 1949 | pj_time_val delay = {0, 0}; |
| 1950 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 1951 | |
| 1952 | pj_strerror((pj_status_t)-sent, errmsg, sizeof(errmsg)); |
| 1953 | |
| 1954 | PJ_LOG(2,(tsx->obj_name, "Transport failed to send %s! Err=%d (%s)", |
| 1955 | pjsip_tx_data_get_info(tdata), -sent, errmsg)); |
| 1956 | |
| 1957 | /* Post the event for later processing, to avoid deadlock. |
| 1958 | * See https://trac.pjsip.org/repos/ticket/1646 |
| 1959 | */ |
| 1960 | lock_timer(tsx); |
| 1961 | tsx->transport_err = (pj_status_t)-sent; |
| 1962 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1963 | tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay, |
| 1964 | TRANSPORT_ERR_TIMER); |
| 1965 | unlock_timer(tsx); |
| 1966 | } |
| 1967 | |
| 1968 | /* Decrease pending send counter */ |
| 1969 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 1970 | } |
| 1971 | |
| 1972 | |
| 1973 | /* |
| 1974 | * Callback when transport state changes. |
| 1975 | */ |
| 1976 | static void tsx_tp_state_callback( pjsip_transport *tp, |
| 1977 | pjsip_transport_state state, |
| 1978 | const pjsip_transport_state_info *info) |
| 1979 | { |
| 1980 | PJ_UNUSED_ARG(tp); |
| 1981 | |
| 1982 | if (state == PJSIP_TP_STATE_DISCONNECTED) { |
| 1983 | pjsip_transaction *tsx; |
| 1984 | pj_time_val delay = {0, 0}; |
| 1985 | |
| 1986 | pj_assert(tp && info && info->user_data); |
| 1987 | |
| 1988 | tsx = (pjsip_transaction*)info->user_data; |
| 1989 | |
| 1990 | /* Post the event for later processing, to avoid deadlock. |
| 1991 | * See https://trac.pjsip.org/repos/ticket/1646 |
| 1992 | */ |
| 1993 | lock_timer(tsx); |
| 1994 | tsx->transport_err = info->status; |
| 1995 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 1996 | tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay, |
| 1997 | TRANSPORT_ERR_TIMER); |
| 1998 | unlock_timer(tsx); |
| 1999 | } |
| 2000 | } |
| 2001 | |
| 2002 | |
| 2003 | /* |
| 2004 | * Send message to the transport. |
| 2005 | */ |
| 2006 | static pj_status_t tsx_send_msg( pjsip_transaction *tsx, |
| 2007 | pjsip_tx_data *tdata) |
| 2008 | { |
| 2009 | pj_status_t status = PJ_SUCCESS; |
| 2010 | |
| 2011 | PJ_ASSERT_RETURN(tsx && tdata, PJ_EINVAL); |
| 2012 | |
| 2013 | /* Send later if transport is still pending. */ |
| 2014 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2015 | tsx->transport_flag |= TSX_HAS_PENDING_SEND; |
| 2016 | return PJ_SUCCESS; |
| 2017 | } |
| 2018 | |
| 2019 | /* Skip send if previous tdata transmission is pending (see #1665). */ |
| 2020 | if (tdata->is_pending) { |
| 2021 | PJ_LOG(2,(THIS_FILE, "Unable to send %s: message is pending", |
| 2022 | pjsip_tx_data_get_info(tdata))); |
| 2023 | return PJ_SUCCESS; |
| 2024 | } |
| 2025 | |
| 2026 | /* If we have the transport, send the message using that transport. |
| 2027 | * Otherwise perform full transport resolution. |
| 2028 | */ |
| 2029 | if (tsx->transport) { |
| 2030 | /* Increment group lock while waiting for send operation to complete, |
| 2031 | * to prevent us from being destroyed prematurely. See |
| 2032 | * https://trac.pjsip.org/repos/ticket/1646 |
| 2033 | */ |
| 2034 | pj_grp_lock_add_ref(tsx->grp_lock); |
| 2035 | tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| 2036 | |
| 2037 | status = pjsip_transport_send( tsx->transport, tdata, &tsx->addr, |
| 2038 | tsx->addr_len, tsx, |
| 2039 | &transport_callback); |
| 2040 | if (status == PJ_EPENDING) |
| 2041 | status = PJ_SUCCESS; |
| 2042 | else { |
| 2043 | /* Operation completes immediately */ |
| 2044 | tsx->transport_flag &= ~(TSX_HAS_PENDING_TRANSPORT); |
| 2045 | pj_grp_lock_dec_ref(tsx->grp_lock); |
| 2046 | } |
| 2047 | |
| 2048 | if (status != PJ_SUCCESS) { |
| 2049 | PJ_PERROR(2,(tsx->obj_name, status, |
| 2050 | "Error sending %s", |
| 2051 | pjsip_tx_data_get_info(tdata))); |
| 2052 | |
| 2053 | /* On error, release transport to force using full transport |
| 2054 | * resolution procedure. |
| 2055 | */ |
| 2056 | tsx_update_transport(tsx, NULL); |
| 2057 | |
| 2058 | tsx->addr_len = 0; |
| 2059 | tsx->res_addr.transport = NULL; |
| 2060 | tsx->res_addr.addr_len = 0; |
| 2061 | } else { |
| 2062 | return PJ_SUCCESS; |
| 2063 | } |
| 2064 | } |
| 2065 | |
| 2066 | /* We are here because we don't have transport, or we failed to send |
| 2067 | * the message using existing transport. If we haven't resolved the |
| 2068 | * server before, then begin the long process of resolving the server |
| 2069 | * and send the message with possibly new server. |
| 2070 | */ |
| 2071 | pj_assert(status != PJ_SUCCESS || tsx->transport == NULL); |
| 2072 | |
| 2073 | /* If we have resolved the server, we treat the error as permanent error. |
| 2074 | * Terminate transaction with transport error failure. |
| 2075 | */ |
| 2076 | if (tsx->transport_flag & TSX_HAS_RESOLVED_SERVER) { |
| 2077 | |
| 2078 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 2079 | pj_str_t err; |
| 2080 | |
| 2081 | if (status == PJ_SUCCESS) { |
| 2082 | pj_assert(!"Unexpected status!"); |
| 2083 | status = PJ_EUNKNOWN; |
| 2084 | } |
| 2085 | |
| 2086 | /* We have resolved the server!. |
| 2087 | * Treat this as permanent transport error. |
| 2088 | */ |
| 2089 | err = pj_strerror(status, errmsg, sizeof(errmsg)); |
| 2090 | |
| 2091 | PJ_LOG(2,(tsx->obj_name, |
| 2092 | "Transport error, terminating transaction. " |
| 2093 | "Err=%d (%s)", |
| 2094 | status, errmsg)); |
| 2095 | |
| 2096 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TRANSPORT_ERROR, &err); |
| 2097 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2098 | PJSIP_EVENT_TRANSPORT_ERROR, NULL ); |
| 2099 | |
| 2100 | return status; |
| 2101 | } |
| 2102 | |
| 2103 | /* Must add reference counter because the send request functions |
| 2104 | * decrement the reference counter. |
| 2105 | */ |
| 2106 | pjsip_tx_data_add_ref(tdata); |
| 2107 | |
| 2108 | /* Also attach ourselves to the transmit data so that we'll be able |
| 2109 | * to unregister ourselves from the send notification of this |
| 2110 | * transmit data. |
| 2111 | */ |
| 2112 | tdata->mod_data[mod_tsx_layer.mod.id] = tsx; |
| 2113 | tsx->pending_tx = tdata; |
| 2114 | |
| 2115 | /* Begin resolving destination etc to send the message. */ |
| 2116 | if (tdata->msg->type == PJSIP_REQUEST_MSG) { |
| 2117 | |
| 2118 | tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| 2119 | status = pjsip_endpt_send_request_stateless(tsx->endpt, tdata, tsx, |
| 2120 | &send_msg_callback); |
| 2121 | if (status == PJ_EPENDING) |
| 2122 | status = PJ_SUCCESS; |
| 2123 | if (status != PJ_SUCCESS) { |
| 2124 | pjsip_tx_data_dec_ref(tdata); |
| 2125 | tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| 2126 | tsx->pending_tx = NULL; |
| 2127 | } |
| 2128 | |
| 2129 | /* Check if transaction is terminated. */ |
| 2130 | if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TERMINATED) |
| 2131 | status = tsx->transport_err; |
| 2132 | |
| 2133 | } else { |
| 2134 | |
| 2135 | tsx->transport_flag |= TSX_HAS_PENDING_TRANSPORT; |
| 2136 | status = pjsip_endpt_send_response( tsx->endpt, &tsx->res_addr, |
| 2137 | tdata, tsx, |
| 2138 | &send_msg_callback); |
| 2139 | if (status == PJ_EPENDING) |
| 2140 | status = PJ_SUCCESS; |
| 2141 | if (status != PJ_SUCCESS) { |
| 2142 | pjsip_tx_data_dec_ref(tdata); |
| 2143 | tdata->mod_data[mod_tsx_layer.mod.id] = NULL; |
| 2144 | tsx->pending_tx = NULL; |
| 2145 | } |
| 2146 | |
| 2147 | /* Check if transaction is terminated. */ |
| 2148 | if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TERMINATED) |
| 2149 | status = tsx->transport_err; |
| 2150 | |
| 2151 | } |
| 2152 | |
| 2153 | |
| 2154 | return status; |
| 2155 | } |
| 2156 | |
| 2157 | |
| 2158 | /* |
| 2159 | * Manually retransmit the last messagewithout updating the transaction state. |
| 2160 | */ |
| 2161 | PJ_DEF(pj_status_t) pjsip_tsx_retransmit_no_state(pjsip_transaction *tsx, |
| 2162 | pjsip_tx_data *tdata) |
| 2163 | { |
| 2164 | pj_status_t status; |
| 2165 | |
| 2166 | pj_grp_lock_acquire(tsx->grp_lock); |
| 2167 | if (tdata == NULL) { |
| 2168 | tdata = tsx->last_tx; |
| 2169 | } |
| 2170 | status = tsx_send_msg(tsx, tdata); |
| 2171 | pj_grp_lock_release(tsx->grp_lock); |
| 2172 | |
| 2173 | /* Only decrement reference counter when it returns success. |
| 2174 | * (This is the specification from the .PDF design document). |
| 2175 | */ |
| 2176 | if (status == PJ_SUCCESS) { |
| 2177 | pjsip_tx_data_dec_ref(tdata); |
| 2178 | } |
| 2179 | |
| 2180 | return status; |
| 2181 | } |
| 2182 | |
| 2183 | |
| 2184 | /* |
| 2185 | * Retransmit last message sent. |
| 2186 | */ |
| 2187 | static void tsx_resched_retransmission( pjsip_transaction *tsx ) |
| 2188 | { |
| 2189 | pj_uint32_t msec_time; |
| 2190 | |
| 2191 | pj_assert((tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) == 0); |
| 2192 | |
| 2193 | if (tsx->role==PJSIP_ROLE_UAC && tsx->status_code >= 100) |
| 2194 | msec_time = pjsip_cfg()->tsx.t2; |
| 2195 | else |
| 2196 | msec_time = (1 << (tsx->retransmit_count)) * pjsip_cfg()->tsx.t1; |
| 2197 | |
| 2198 | if (tsx->role == PJSIP_ROLE_UAC) { |
| 2199 | pj_assert(tsx->status_code < 200); |
| 2200 | /* Retransmission for non-INVITE transaction caps-off at T2 */ |
| 2201 | if (msec_time > pjsip_cfg()->tsx.t2 && |
| 2202 | tsx->method.id != PJSIP_INVITE_METHOD) |
| 2203 | { |
| 2204 | msec_time = pjsip_cfg()->tsx.t2; |
| 2205 | } |
| 2206 | } else { |
| 2207 | /* For UAS, this can be retransmission of 2xx response for INVITE |
| 2208 | * or non-100 1xx response. |
| 2209 | */ |
| 2210 | if (tsx->status_code < 200) { |
| 2211 | /* non-100 1xx retransmission is at 60 seconds */ |
| 2212 | msec_time = PJSIP_TSX_1XX_RETRANS_DELAY * 1000; |
| 2213 | } else { |
| 2214 | /* Retransmission of INVITE final response also caps-off at T2 */ |
| 2215 | pj_assert(tsx->status_code >= 200); |
| 2216 | if (msec_time > pjsip_cfg()->tsx.t2) |
| 2217 | msec_time = pjsip_cfg()->tsx.t2; |
| 2218 | } |
| 2219 | } |
| 2220 | |
| 2221 | if (msec_time != 0) { |
| 2222 | pj_time_val timeout; |
| 2223 | |
| 2224 | timeout.sec = msec_time / 1000; |
| 2225 | timeout.msec = msec_time % 1000; |
| 2226 | tsx_schedule_timer( tsx, &tsx->retransmit_timer, &timeout, |
| 2227 | RETRANSMIT_TIMER); |
| 2228 | } |
| 2229 | } |
| 2230 | |
| 2231 | /* |
| 2232 | * Retransmit last message sent. |
| 2233 | */ |
| 2234 | static pj_status_t tsx_retransmit( pjsip_transaction *tsx, int resched) |
| 2235 | { |
| 2236 | pj_status_t status; |
| 2237 | |
| 2238 | if (resched && pj_timer_entry_running(&tsx->retransmit_timer)) { |
| 2239 | /* We've been asked to reschedule but the timer is already rerunning. |
| 2240 | * This can only happen in a race condition where, between removing |
| 2241 | * this retransmit timer from the heap and actually scheduling it, |
| 2242 | * another thread has got in and rescheduled the timer itself. In |
| 2243 | * this scenario, the transmission has already happened and so we |
| 2244 | * should just quit out immediately, without either resending the |
| 2245 | * message or restarting the timer. |
| 2246 | */ |
| 2247 | return PJ_SUCCESS; |
| 2248 | } |
| 2249 | |
| 2250 | PJ_ASSERT_RETURN(tsx->last_tx!=NULL, PJ_EBUG); |
| 2251 | |
| 2252 | PJ_LOG(5,(tsx->obj_name, "Retransmiting %s, count=%d, restart?=%d", |
| 2253 | pjsip_tx_data_get_info(tsx->last_tx), |
| 2254 | tsx->retransmit_count, resched)); |
| 2255 | |
| 2256 | ++tsx->retransmit_count; |
| 2257 | |
| 2258 | /* Restart timer T1 first before sending the message to ensure that |
| 2259 | * retransmission timer is not engaged when loop transport is used. |
| 2260 | */ |
| 2261 | if (resched) { |
| 2262 | pj_assert(tsx->state != PJSIP_TSX_STATE_CONFIRMED); |
| 2263 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2264 | tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| 2265 | } else { |
| 2266 | tsx_resched_retransmission(tsx); |
| 2267 | } |
| 2268 | } |
| 2269 | |
| 2270 | status = tsx_send_msg( tsx, tsx->last_tx); |
| 2271 | if (status != PJ_SUCCESS) { |
| 2272 | return status; |
| 2273 | } |
| 2274 | |
| 2275 | return PJ_SUCCESS; |
| 2276 | } |
| 2277 | |
| 2278 | static void tsx_update_transport( pjsip_transaction *tsx, |
| 2279 | pjsip_transport *tp) |
| 2280 | { |
| 2281 | pj_assert(tsx); |
| 2282 | |
| 2283 | if (tsx->transport) { |
| 2284 | pjsip_transport_remove_state_listener(tsx->transport, |
| 2285 | tsx->tp_st_key, tsx); |
| 2286 | pjsip_transport_dec_ref( tsx->transport ); |
| 2287 | tsx->transport = NULL; |
| 2288 | } |
| 2289 | |
| 2290 | if (tp) { |
| 2291 | tsx->transport = tp; |
| 2292 | pjsip_transport_add_ref(tp); |
| 2293 | pjsip_transport_add_state_listener(tp, &tsx_tp_state_callback, tsx, |
| 2294 | &tsx->tp_st_key); |
| 2295 | if (tp->is_shutdown) { |
| 2296 | pjsip_transport_state_info info; |
| 2297 | |
| 2298 | pj_bzero(&info, sizeof(info)); |
| 2299 | info.user_data = tsx; |
| 2300 | info.status = PJSIP_SC_TSX_TRANSPORT_ERROR; |
| 2301 | tsx_tp_state_callback(tp, PJSIP_TP_STATE_DISCONNECTED, &info); |
| 2302 | } |
| 2303 | } |
| 2304 | } |
| 2305 | |
| 2306 | /* |
| 2307 | * Handler for events in state Null. |
| 2308 | */ |
| 2309 | static pj_status_t tsx_on_state_null( pjsip_transaction *tsx, |
| 2310 | pjsip_event *event ) |
| 2311 | { |
| 2312 | pj_status_t status; |
| 2313 | |
| 2314 | pj_assert(tsx->state == PJSIP_TSX_STATE_NULL); |
| 2315 | |
| 2316 | if (tsx->role == PJSIP_ROLE_UAS) { |
| 2317 | |
| 2318 | /* Set state to Trying. */ |
| 2319 | pj_assert(event->type == PJSIP_EVENT_RX_MSG && |
| 2320 | event->body.rx_msg.rdata->msg_info.msg->type == |
| 2321 | PJSIP_REQUEST_MSG); |
| 2322 | tsx_set_state( tsx, PJSIP_TSX_STATE_TRYING, PJSIP_EVENT_RX_MSG, |
| 2323 | event->body.rx_msg.rdata); |
| 2324 | |
| 2325 | } else { |
| 2326 | pjsip_tx_data *tdata; |
| 2327 | |
| 2328 | /* Must be transmit event. |
| 2329 | * You may got this assertion when using loop transport with delay |
| 2330 | * set to zero. That would cause on_rx_response() callback to be |
| 2331 | * called before tsx_send_msg() has completed. |
| 2332 | */ |
| 2333 | PJ_ASSERT_RETURN(event->type == PJSIP_EVENT_TX_MSG, PJ_EBUG); |
| 2334 | |
| 2335 | /* Get the txdata */ |
| 2336 | tdata = event->body.tx_msg.tdata; |
| 2337 | |
| 2338 | /* Save the message for retransmission. */ |
| 2339 | if (tsx->last_tx && tsx->last_tx != tdata) { |
| 2340 | pjsip_tx_data_dec_ref(tsx->last_tx); |
| 2341 | tsx->last_tx = NULL; |
| 2342 | } |
| 2343 | if (tsx->last_tx != tdata) { |
| 2344 | tsx->last_tx = tdata; |
| 2345 | pjsip_tx_data_add_ref(tdata); |
| 2346 | } |
| 2347 | |
| 2348 | /* Send the message. */ |
| 2349 | status = tsx_send_msg( tsx, tdata); |
| 2350 | if (status != PJ_SUCCESS) { |
| 2351 | return status; |
| 2352 | } |
| 2353 | |
| 2354 | /* Start Timer B (or called timer F for non-INVITE) for transaction |
| 2355 | * timeout. |
| 2356 | */ |
| 2357 | lock_timer(tsx); |
| 2358 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 2359 | tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout_timer_val, |
| 2360 | TIMEOUT_TIMER); |
| 2361 | unlock_timer(tsx); |
| 2362 | |
| 2363 | /* Start Timer A (or timer E) for retransmission only if unreliable |
| 2364 | * transport is being used. |
| 2365 | */ |
| 2366 | if (!tsx->is_reliable) { |
| 2367 | tsx->retransmit_count = 0; |
| 2368 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2369 | tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| 2370 | } else { |
| 2371 | tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| 2372 | &t1_timer_val, RETRANSMIT_TIMER); |
| 2373 | } |
| 2374 | } |
| 2375 | |
| 2376 | /* Move state. */ |
| 2377 | tsx_set_state( tsx, PJSIP_TSX_STATE_CALLING, |
| 2378 | PJSIP_EVENT_TX_MSG, tdata); |
| 2379 | } |
| 2380 | |
| 2381 | return PJ_SUCCESS; |
| 2382 | } |
| 2383 | |
| 2384 | |
| 2385 | /* |
| 2386 | * State Calling is for UAC after it sends request but before any responses |
| 2387 | * is received. |
| 2388 | */ |
| 2389 | static pj_status_t tsx_on_state_calling( pjsip_transaction *tsx, |
| 2390 | pjsip_event *event ) |
| 2391 | { |
| 2392 | pj_assert(tsx->state == PJSIP_TSX_STATE_CALLING); |
| 2393 | pj_assert(tsx->role == PJSIP_ROLE_UAC); |
| 2394 | |
| 2395 | if (event->type == PJSIP_EVENT_TIMER && |
| 2396 | event->body.timer.entry == &tsx->retransmit_timer) |
| 2397 | { |
| 2398 | pj_status_t status; |
| 2399 | |
| 2400 | /* Retransmit the request. */ |
| 2401 | status = tsx_retransmit( tsx, 1 ); |
| 2402 | if (status != PJ_SUCCESS) { |
| 2403 | return status; |
| 2404 | } |
| 2405 | |
| 2406 | } else if (event->type == PJSIP_EVENT_TIMER && |
| 2407 | event->body.timer.entry == &tsx->timeout_timer) |
| 2408 | { |
| 2409 | /* Cancel retransmission timer. */ |
| 2410 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2411 | |
| 2412 | tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| 2413 | |
| 2414 | /* Set status code */ |
| 2415 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| 2416 | |
| 2417 | /* Inform TU. */ |
| 2418 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2419 | PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| 2420 | |
| 2421 | /* Transaction is destroyed */ |
| 2422 | //return PJSIP_ETSXDESTROYED; |
| 2423 | |
| 2424 | } else if (event->type == PJSIP_EVENT_RX_MSG) { |
| 2425 | pjsip_msg *msg; |
| 2426 | int code; |
| 2427 | |
| 2428 | /* Get message instance */ |
| 2429 | msg = event->body.rx_msg.rdata->msg_info.msg; |
| 2430 | |
| 2431 | /* Better be a response message. */ |
| 2432 | if (msg->type != PJSIP_RESPONSE_MSG) |
| 2433 | return PJSIP_ENOTRESPONSEMSG; |
| 2434 | |
| 2435 | code = msg->line.status.code; |
| 2436 | |
| 2437 | /* If the response is final, cancel both retransmission and timeout |
| 2438 | * timer. |
| 2439 | */ |
| 2440 | if (code >= 200) { |
| 2441 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2442 | |
| 2443 | if (tsx->timeout_timer.id != 0) { |
| 2444 | lock_timer(tsx); |
| 2445 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 2446 | unlock_timer(tsx); |
| 2447 | } |
| 2448 | |
| 2449 | } else { |
| 2450 | /* Cancel retransmit timer (for non-INVITE transaction, the |
| 2451 | * retransmit timer will be rescheduled at T2. |
| 2452 | */ |
| 2453 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2454 | |
| 2455 | /* For provisional response, only cancel retransmit when this |
| 2456 | * is an INVITE transaction. For non-INVITE, section 17.1.2.1 |
| 2457 | * of RFC 3261 says that: |
| 2458 | * - retransmit timer is set to T2 |
| 2459 | * - timeout timer F is not deleted. |
| 2460 | */ |
| 2461 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2462 | |
| 2463 | /* Cancel timeout timer */ |
| 2464 | lock_timer(tsx); |
| 2465 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 2466 | unlock_timer(tsx); |
| 2467 | |
| 2468 | } else { |
| 2469 | if (!tsx->is_reliable) { |
| 2470 | tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| 2471 | &t2_timer_val, RETRANSMIT_TIMER); |
| 2472 | } |
| 2473 | } |
| 2474 | } |
| 2475 | |
| 2476 | tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| 2477 | |
| 2478 | |
| 2479 | /* Discard retransmission message if it is not INVITE. |
| 2480 | * The INVITE tdata is needed in case we have to generate ACK for |
| 2481 | * the final response. |
| 2482 | */ |
| 2483 | /* Keep last_tx for authorization. */ |
| 2484 | //blp: always keep last_tx until transaction is destroyed |
| 2485 | //code = msg->line.status.code; |
| 2486 | //if (tsx->method.id != PJSIP_INVITE_METHOD && code!=401 && code!=407) { |
| 2487 | // pjsip_tx_data_dec_ref(tsx->last_tx); |
| 2488 | // tsx->last_tx = NULL; |
| 2489 | //} |
| 2490 | |
| 2491 | /* Processing is similar to state Proceeding. */ |
| 2492 | tsx_on_state_proceeding_uac( tsx, event); |
| 2493 | |
| 2494 | } else { |
| 2495 | pj_assert(!"Unexpected event"); |
| 2496 | return PJ_EBUG; |
| 2497 | } |
| 2498 | |
| 2499 | return PJ_SUCCESS; |
| 2500 | } |
| 2501 | |
| 2502 | |
| 2503 | /* |
| 2504 | * State Trying is for UAS after it received request but before any responses |
| 2505 | * is sent. |
| 2506 | * Note: this is different than RFC3261, which can use Trying state for |
| 2507 | * non-INVITE client transaction (bug in RFC?). |
| 2508 | */ |
| 2509 | static pj_status_t tsx_on_state_trying( pjsip_transaction *tsx, |
| 2510 | pjsip_event *event) |
| 2511 | { |
| 2512 | pj_status_t status; |
| 2513 | |
| 2514 | pj_assert(tsx->state == PJSIP_TSX_STATE_TRYING); |
| 2515 | |
| 2516 | /* This state is only for UAS */ |
| 2517 | pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| 2518 | |
| 2519 | /* Better be transmission of response message. |
| 2520 | * If we've got request retransmission, this means that the TU hasn't |
| 2521 | * transmitted any responses within 500 ms, which is not allowed. If |
| 2522 | * this happens, just ignore the event (we couldn't retransmit last |
| 2523 | * response because we haven't sent any!). |
| 2524 | */ |
| 2525 | if (event->type != PJSIP_EVENT_TX_MSG) { |
| 2526 | return PJ_SUCCESS; |
| 2527 | } |
| 2528 | |
| 2529 | /* The rest of the processing of the event is exactly the same as in |
| 2530 | * "Proceeding" state. |
| 2531 | */ |
| 2532 | status = tsx_on_state_proceeding_uas( tsx, event); |
| 2533 | |
| 2534 | /* Inform the TU of the state transision if state is still State_Trying */ |
| 2535 | if (status==PJ_SUCCESS && tsx->state == PJSIP_TSX_STATE_TRYING) { |
| 2536 | |
| 2537 | tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| 2538 | PJSIP_EVENT_TX_MSG, event->body.tx_msg.tdata); |
| 2539 | |
| 2540 | } |
| 2541 | |
| 2542 | return status; |
| 2543 | } |
| 2544 | |
| 2545 | |
| 2546 | /* |
| 2547 | * Handler for events in Proceeding for UAS |
| 2548 | * This state happens after the TU sends provisional response. |
| 2549 | */ |
| 2550 | static pj_status_t tsx_on_state_proceeding_uas( pjsip_transaction *tsx, |
| 2551 | pjsip_event *event) |
| 2552 | { |
| 2553 | pj_assert(tsx->state == PJSIP_TSX_STATE_PROCEEDING || |
| 2554 | tsx->state == PJSIP_TSX_STATE_TRYING); |
| 2555 | |
| 2556 | /* This state is only for UAS. */ |
| 2557 | pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| 2558 | |
| 2559 | /* Receive request retransmission. */ |
| 2560 | if (event->type == PJSIP_EVENT_RX_MSG) { |
| 2561 | |
| 2562 | pj_status_t status; |
| 2563 | |
| 2564 | /* Must have last response sent. */ |
| 2565 | PJ_ASSERT_RETURN(tsx->last_tx != NULL, PJ_EBUG); |
| 2566 | |
| 2567 | /* Send last response */ |
| 2568 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2569 | tsx->transport_flag |= TSX_HAS_PENDING_SEND; |
| 2570 | } else { |
| 2571 | status = tsx_send_msg(tsx, tsx->last_tx); |
| 2572 | if (status != PJ_SUCCESS) |
| 2573 | return status; |
| 2574 | } |
| 2575 | |
| 2576 | } else if (event->type == PJSIP_EVENT_TX_MSG ) { |
| 2577 | pjsip_tx_data *tdata = event->body.tx_msg.tdata; |
| 2578 | pj_status_t status; |
| 2579 | |
| 2580 | /* The TU sends response message to the request. Save this message so |
| 2581 | * that we can retransmit the last response in case we receive request |
| 2582 | * retransmission. |
| 2583 | */ |
| 2584 | pjsip_msg *msg = tdata->msg; |
| 2585 | |
| 2586 | /* This can only be a response message. */ |
| 2587 | PJ_ASSERT_RETURN(msg->type==PJSIP_RESPONSE_MSG, PJSIP_ENOTRESPONSEMSG); |
| 2588 | |
| 2589 | /* Update last status */ |
| 2590 | tsx_set_status_code(tsx, msg->line.status.code, |
| 2591 | &msg->line.status.reason); |
| 2592 | |
| 2593 | /* Discard the saved last response (it will be updated later as |
| 2594 | * necessary). |
| 2595 | */ |
| 2596 | if (tsx->last_tx && tsx->last_tx != tdata) { |
| 2597 | pjsip_tx_data_dec_ref( tsx->last_tx ); |
| 2598 | tsx->last_tx = NULL; |
| 2599 | } |
| 2600 | |
| 2601 | /* Send the message. */ |
| 2602 | status = tsx_send_msg(tsx, tdata); |
| 2603 | if (status != PJ_SUCCESS) { |
| 2604 | return status; |
| 2605 | } |
| 2606 | |
| 2607 | // Update To tag header for RFC2543 transaction. |
| 2608 | // TODO: |
| 2609 | |
| 2610 | /* Update transaction state */ |
| 2611 | if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 100)) { |
| 2612 | |
| 2613 | if (tsx->last_tx != tdata) { |
| 2614 | tsx->last_tx = tdata; |
| 2615 | pjsip_tx_data_add_ref( tdata ); |
| 2616 | } |
| 2617 | |
| 2618 | tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| 2619 | PJSIP_EVENT_TX_MSG, tdata ); |
| 2620 | |
| 2621 | /* Retransmit provisional response every 1 minute if this is |
| 2622 | * an INVITE provisional response greater than 100. |
| 2623 | */ |
| 2624 | if (PJSIP_TSX_1XX_RETRANS_DELAY > 0 && |
| 2625 | tsx->method.id==PJSIP_INVITE_METHOD && tsx->status_code>100) |
| 2626 | { |
| 2627 | |
| 2628 | /* Stop 1xx retransmission timer, if any */ |
| 2629 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2630 | |
| 2631 | /* Schedule retransmission */ |
| 2632 | tsx->retransmit_count = 0; |
| 2633 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2634 | tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| 2635 | } else { |
| 2636 | pj_time_val delay = {PJSIP_TSX_1XX_RETRANS_DELAY, 0}; |
| 2637 | tsx_schedule_timer( tsx, &tsx->retransmit_timer, &delay, |
| 2638 | RETRANSMIT_TIMER); |
| 2639 | } |
| 2640 | } |
| 2641 | |
| 2642 | } else if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 200)) { |
| 2643 | |
| 2644 | /* Stop 1xx retransmission timer, if any */ |
| 2645 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2646 | |
| 2647 | if (tsx->method.id == PJSIP_INVITE_METHOD && tsx->handle_200resp==0) { |
| 2648 | |
| 2649 | /* 2xx class message is not saved, because retransmission |
| 2650 | * is handled by TU. |
| 2651 | */ |
| 2652 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2653 | PJSIP_EVENT_TX_MSG, tdata ); |
| 2654 | |
| 2655 | /* Transaction is destroyed. */ |
| 2656 | //return PJSIP_ETSXDESTROYED; |
| 2657 | |
| 2658 | } else { |
| 2659 | pj_time_val timeout; |
| 2660 | |
| 2661 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2662 | tsx->retransmit_count = 0; |
| 2663 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2664 | tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| 2665 | } else { |
| 2666 | tsx_schedule_timer( tsx, &tsx->retransmit_timer, |
| 2667 | &t1_timer_val, RETRANSMIT_TIMER); |
| 2668 | } |
| 2669 | } |
| 2670 | |
| 2671 | /* Save last response sent for retransmission when request |
| 2672 | * retransmission is received. |
| 2673 | */ |
| 2674 | if (tsx->last_tx != tdata) { |
| 2675 | tsx->last_tx = tdata; |
| 2676 | pjsip_tx_data_add_ref(tdata); |
| 2677 | } |
| 2678 | |
| 2679 | /* Setup timeout timer: */ |
| 2680 | |
| 2681 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2682 | |
| 2683 | /* Start Timer H at 64*T1 for INVITE server transaction, |
| 2684 | * regardless of transport. |
| 2685 | */ |
| 2686 | timeout = timeout_timer_val; |
| 2687 | |
| 2688 | } else if (!tsx->is_reliable) { |
| 2689 | |
| 2690 | /* For non-INVITE, start timer J at 64*T1 for unreliable |
| 2691 | * transport. |
| 2692 | */ |
| 2693 | timeout = timeout_timer_val; |
| 2694 | |
| 2695 | } else { |
| 2696 | |
| 2697 | /* Transaction terminates immediately for non-INVITE when |
| 2698 | * reliable transport is used. |
| 2699 | */ |
| 2700 | timeout.sec = timeout.msec = 0; |
| 2701 | } |
| 2702 | |
| 2703 | lock_timer(tsx); |
| 2704 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 2705 | tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| 2706 | &timeout, TIMEOUT_TIMER); |
| 2707 | unlock_timer(tsx); |
| 2708 | |
| 2709 | /* Set state to "Completed" */ |
| 2710 | tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| 2711 | PJSIP_EVENT_TX_MSG, tdata ); |
| 2712 | } |
| 2713 | |
| 2714 | } else if (tsx->status_code >= 300) { |
| 2715 | |
| 2716 | /* Stop 1xx retransmission timer, if any */ |
| 2717 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2718 | |
| 2719 | /* 3xx-6xx class message causes transaction to move to |
| 2720 | * "Completed" state. |
| 2721 | */ |
| 2722 | if (tsx->last_tx != tdata) { |
| 2723 | tsx->last_tx = tdata; |
| 2724 | pjsip_tx_data_add_ref( tdata ); |
| 2725 | } |
| 2726 | |
| 2727 | /* For INVITE, start timer H for transaction termination |
| 2728 | * regardless whether transport is reliable or not. |
| 2729 | * For non-INVITE, start timer J with the value of 64*T1 for |
| 2730 | * non-reliable transports, and zero for reliable transports. |
| 2731 | */ |
| 2732 | lock_timer(tsx); |
| 2733 | tsx_cancel_timer(tsx, &tsx->timeout_timer); |
| 2734 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2735 | /* Start timer H for INVITE */ |
| 2736 | tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| 2737 | &timeout_timer_val, TIMEOUT_TIMER); |
| 2738 | } else if (!tsx->is_reliable) { |
| 2739 | /* Start timer J on 64*T1 seconds for non-INVITE */ |
| 2740 | tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| 2741 | &timeout_timer_val, TIMEOUT_TIMER); |
| 2742 | } else { |
| 2743 | /* Start timer J on zero seconds for non-INVITE */ |
| 2744 | pj_time_val zero_time = { 0, 0 }; |
| 2745 | tsx_schedule_timer(tsx, &tsx->timeout_timer, |
| 2746 | &zero_time, TIMEOUT_TIMER); |
| 2747 | } |
| 2748 | unlock_timer(tsx); |
| 2749 | |
| 2750 | /* For INVITE, if unreliable transport is used, retransmission |
| 2751 | * timer G will be scheduled (retransmission). |
| 2752 | */ |
| 2753 | if (!tsx->is_reliable) { |
| 2754 | pjsip_cseq_hdr *cseq = (pjsip_cseq_hdr*) |
| 2755 | pjsip_msg_find_hdr( msg, PJSIP_H_CSEQ, |
| 2756 | NULL); |
| 2757 | if (cseq->method.id == PJSIP_INVITE_METHOD) { |
| 2758 | tsx->retransmit_count = 0; |
| 2759 | if (tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) { |
| 2760 | tsx->transport_flag |= TSX_HAS_PENDING_RESCHED; |
| 2761 | } else { |
| 2762 | tsx_schedule_timer(tsx, &tsx->retransmit_timer, |
| 2763 | &t1_timer_val, RETRANSMIT_TIMER); |
| 2764 | } |
| 2765 | } |
| 2766 | } |
| 2767 | |
| 2768 | /* Inform TU */ |
| 2769 | tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| 2770 | PJSIP_EVENT_TX_MSG, tdata ); |
| 2771 | |
| 2772 | } else { |
| 2773 | pj_assert(0); |
| 2774 | } |
| 2775 | |
| 2776 | |
| 2777 | } else if (event->type == PJSIP_EVENT_TIMER && |
| 2778 | event->body.timer.entry == &tsx->retransmit_timer) { |
| 2779 | |
| 2780 | /* Retransmission timer elapsed. */ |
| 2781 | pj_status_t status; |
| 2782 | |
| 2783 | /* Must not be triggered while transport is pending. */ |
| 2784 | pj_assert((tsx->transport_flag & TSX_HAS_PENDING_TRANSPORT) == 0); |
| 2785 | |
| 2786 | /* Must have last response to retransmit. */ |
| 2787 | pj_assert(tsx->last_tx != NULL); |
| 2788 | |
| 2789 | /* Retransmit the last response. */ |
| 2790 | status = tsx_retransmit( tsx, 1 ); |
| 2791 | if (status != PJ_SUCCESS) { |
| 2792 | return status; |
| 2793 | } |
| 2794 | |
| 2795 | } else if (event->type == PJSIP_EVENT_TIMER && |
| 2796 | event->body.timer.entry == &tsx->timeout_timer) { |
| 2797 | |
| 2798 | /* Timeout timer. should not happen? */ |
| 2799 | pj_assert(!"Should not happen(?)"); |
| 2800 | |
| 2801 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| 2802 | |
| 2803 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2804 | PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| 2805 | |
| 2806 | return PJ_EBUG; |
| 2807 | |
| 2808 | } else { |
| 2809 | pj_assert(!"Unexpected event"); |
| 2810 | return PJ_EBUG; |
| 2811 | } |
| 2812 | |
| 2813 | return PJ_SUCCESS; |
| 2814 | } |
| 2815 | |
| 2816 | |
| 2817 | /* |
| 2818 | * Handler for events in Proceeding for UAC |
| 2819 | * This state happens after provisional response(s) has been received from |
| 2820 | * UAS. |
| 2821 | */ |
| 2822 | static pj_status_t tsx_on_state_proceeding_uac(pjsip_transaction *tsx, |
| 2823 | pjsip_event *event) |
| 2824 | { |
| 2825 | |
| 2826 | pj_assert(tsx->state == PJSIP_TSX_STATE_PROCEEDING || |
| 2827 | tsx->state == PJSIP_TSX_STATE_CALLING); |
| 2828 | |
| 2829 | if (event->type != PJSIP_EVENT_TIMER) { |
| 2830 | pjsip_msg *msg; |
| 2831 | |
| 2832 | /* Must be incoming response, because we should not retransmit |
| 2833 | * request once response has been received. |
| 2834 | */ |
| 2835 | pj_assert(event->type == PJSIP_EVENT_RX_MSG); |
| 2836 | if (event->type != PJSIP_EVENT_RX_MSG) { |
| 2837 | return PJ_EINVALIDOP; |
| 2838 | } |
| 2839 | |
| 2840 | msg = event->body.rx_msg.rdata->msg_info.msg; |
| 2841 | |
| 2842 | /* Must be a response message. */ |
| 2843 | if (msg->type != PJSIP_RESPONSE_MSG) { |
| 2844 | pj_assert(!"Expecting response message!"); |
| 2845 | return PJSIP_ENOTRESPONSEMSG; |
| 2846 | } |
| 2847 | |
| 2848 | tsx_set_status_code(tsx, msg->line.status.code, |
| 2849 | &msg->line.status.reason); |
| 2850 | |
| 2851 | } else { |
| 2852 | if (event->body.timer.entry == &tsx->retransmit_timer) { |
| 2853 | /* Retransmit message. */ |
| 2854 | pj_status_t status; |
| 2855 | |
| 2856 | status = tsx_retransmit( tsx, 1 ); |
| 2857 | |
| 2858 | return status; |
| 2859 | |
| 2860 | } else { |
| 2861 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| 2862 | } |
| 2863 | } |
| 2864 | |
| 2865 | if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code, 100)) { |
| 2866 | |
| 2867 | /* Inform the message to TU. */ |
| 2868 | tsx_set_state( tsx, PJSIP_TSX_STATE_PROCEEDING, |
| 2869 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| 2870 | |
| 2871 | } else if (PJSIP_IS_STATUS_IN_CLASS(tsx->status_code,200)) { |
| 2872 | |
| 2873 | /* Stop timeout timer B/F. */ |
| 2874 | lock_timer(tsx); |
| 2875 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 2876 | unlock_timer(tsx); |
| 2877 | |
| 2878 | /* For INVITE, the state moves to Terminated state (because ACK is |
| 2879 | * handled in TU). For non-INVITE, state moves to Completed. |
| 2880 | */ |
| 2881 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2882 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2883 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| 2884 | //return PJSIP_ETSXDESTROYED; |
| 2885 | |
| 2886 | } else { |
| 2887 | pj_time_val timeout; |
| 2888 | |
| 2889 | /* For unreliable transport, start timer D (for INVITE) or |
| 2890 | * timer K for non-INVITE. */ |
| 2891 | if (!tsx->is_reliable) { |
| 2892 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2893 | timeout = td_timer_val; |
| 2894 | } else { |
| 2895 | timeout = t4_timer_val; |
| 2896 | } |
| 2897 | } else { |
| 2898 | timeout.sec = timeout.msec = 0; |
| 2899 | } |
| 2900 | lock_timer(tsx); |
| 2901 | tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| 2902 | &timeout, TIMEOUT_TIMER); |
| 2903 | unlock_timer(tsx); |
| 2904 | |
| 2905 | /* Cancel retransmission timer */ |
| 2906 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2907 | |
| 2908 | /* Move state to Completed, inform TU. */ |
| 2909 | tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| 2910 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| 2911 | } |
| 2912 | |
| 2913 | } else if (event->type == PJSIP_EVENT_TIMER && |
| 2914 | event->body.timer.entry == &tsx->timeout_timer) { |
| 2915 | |
| 2916 | /* Inform TU. */ |
| 2917 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 2918 | PJSIP_EVENT_TIMER, &tsx->timeout_timer); |
| 2919 | |
| 2920 | |
| 2921 | } else if (tsx->status_code >= 300 && tsx->status_code <= 699) { |
| 2922 | |
| 2923 | |
| 2924 | #if 0 |
| 2925 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ |
| 2926 | /* |
| 2927 | * This is the old code; it's broken for authentication. |
| 2928 | */ |
| 2929 | pj_time_val timeout; |
| 2930 | pj_status_t status; |
| 2931 | |
| 2932 | /* Stop timer B. */ |
| 2933 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 2934 | |
| 2935 | /* Generate and send ACK for INVITE. */ |
| 2936 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2937 | pjsip_tx_data *ack; |
| 2938 | |
| 2939 | status = pjsip_endpt_create_ack( tsx->endpt, tsx->last_tx, |
| 2940 | event->body.rx_msg.rdata, |
| 2941 | &ack); |
| 2942 | if (status != PJ_SUCCESS) |
| 2943 | return status; |
| 2944 | |
| 2945 | if (ack != tsx->last_tx) { |
| 2946 | pjsip_tx_data_dec_ref(tsx->last_tx); |
| 2947 | tsx->last_tx = ack; |
| 2948 | } |
| 2949 | |
| 2950 | status = tsx_send_msg( tsx, tsx->last_tx); |
| 2951 | if (status != PJ_SUCCESS) { |
| 2952 | return status; |
| 2953 | } |
| 2954 | } |
| 2955 | |
| 2956 | /* Start Timer D with TD/T4 timer if unreliable transport is used. */ |
| 2957 | if (!tsx->is_reliable) { |
| 2958 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2959 | timeout = td_timer_val; |
| 2960 | } else { |
| 2961 | timeout = t4_timer_val; |
| 2962 | } |
| 2963 | } else { |
| 2964 | timeout.sec = timeout.msec = 0; |
| 2965 | } |
| 2966 | tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, TIMEOUT_TIMER); |
| 2967 | |
| 2968 | /* Inform TU. |
| 2969 | * blp: You might be tempted to move this notification before |
| 2970 | * sending ACK, but I think you shouldn't. Better set-up |
| 2971 | * everything before calling tsx_user's callback to avoid |
| 2972 | * mess up. |
| 2973 | */ |
| 2974 | tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| 2975 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| 2976 | |
| 2977 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ |
| 2978 | #endif |
| 2979 | |
| 2980 | /* New code, taken from 0.2.9.x branch */ |
| 2981 | pj_time_val timeout; |
| 2982 | pjsip_tx_data *ack_tdata = NULL; |
| 2983 | |
| 2984 | /* Cancel retransmission timer */ |
| 2985 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 2986 | |
| 2987 | /* Stop timer B. */ |
| 2988 | lock_timer(tsx); |
| 2989 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 2990 | unlock_timer(tsx); |
| 2991 | |
| 2992 | /* Generate and send ACK (for INVITE) */ |
| 2993 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 2994 | pj_status_t status; |
| 2995 | |
| 2996 | status = pjsip_endpt_create_ack( tsx->endpt, tsx->last_tx, |
| 2997 | event->body.rx_msg.rdata, |
| 2998 | &ack_tdata); |
| 2999 | if (status != PJ_SUCCESS) |
| 3000 | return status; |
| 3001 | |
| 3002 | status = tsx_send_msg( tsx, ack_tdata); |
| 3003 | if (status != PJ_SUCCESS) |
| 3004 | return status; |
| 3005 | } |
| 3006 | |
| 3007 | /* Inform TU. */ |
| 3008 | tsx_set_state( tsx, PJSIP_TSX_STATE_COMPLETED, |
| 3009 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata); |
| 3010 | |
| 3011 | /* Generate and send ACK for INVITE. */ |
| 3012 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 3013 | if (ack_tdata != tsx->last_tx) { |
| 3014 | pjsip_tx_data_dec_ref(tsx->last_tx); |
| 3015 | tsx->last_tx = ack_tdata; |
| 3016 | |
| 3017 | /* This is a bug. |
| 3018 | tsx_send_msg() does NOT decrement tdata's reference counter, |
| 3019 | so if we add the reference counter here, tdata will have |
| 3020 | reference counter 2, causing it to leak. |
| 3021 | pjsip_tx_data_add_ref(ack_tdata); |
| 3022 | */ |
| 3023 | } |
| 3024 | } |
| 3025 | |
| 3026 | /* Start Timer D with TD/T4 timer if unreliable transport is used. */ |
| 3027 | /* Note: tsx->transport may be NULL! */ |
| 3028 | if (!tsx->is_reliable) { |
| 3029 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 3030 | timeout = td_timer_val; |
| 3031 | } else { |
| 3032 | timeout = t4_timer_val; |
| 3033 | } |
| 3034 | } else { |
| 3035 | timeout.sec = timeout.msec = 0; |
| 3036 | } |
| 3037 | lock_timer(tsx); |
| 3038 | /* In the short period above timer may have been inserted |
| 3039 | * by set_timeout() (by CANCEL). Cancel it if necessary. See: |
| 3040 | * https://trac.pjsip.org/repos/ticket/1374 |
| 3041 | */ |
| 3042 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 3043 | tsx_schedule_timer( tsx, &tsx->timeout_timer, &timeout, |
| 3044 | TIMEOUT_TIMER); |
| 3045 | unlock_timer(tsx); |
| 3046 | |
| 3047 | } else { |
| 3048 | // Shouldn't happen because there's no timer for this state. |
| 3049 | pj_assert(!"Unexpected event"); |
| 3050 | return PJ_EBUG; |
| 3051 | } |
| 3052 | |
| 3053 | return PJ_SUCCESS; |
| 3054 | } |
| 3055 | |
| 3056 | |
| 3057 | /* |
| 3058 | * Handler for events in Completed state for UAS |
| 3059 | */ |
| 3060 | static pj_status_t tsx_on_state_completed_uas( pjsip_transaction *tsx, |
| 3061 | pjsip_event *event) |
| 3062 | { |
| 3063 | pj_assert(tsx->state == PJSIP_TSX_STATE_COMPLETED); |
| 3064 | |
| 3065 | if (event->type == PJSIP_EVENT_RX_MSG) { |
| 3066 | pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| 3067 | |
| 3068 | /* This must be a request message retransmission. */ |
| 3069 | if (msg->type != PJSIP_REQUEST_MSG) |
| 3070 | return PJSIP_ENOTREQUESTMSG; |
| 3071 | |
| 3072 | /* On receive request retransmission, retransmit last response. */ |
| 3073 | if (msg->line.req.method.id != PJSIP_ACK_METHOD) { |
| 3074 | pj_status_t status; |
| 3075 | |
| 3076 | status = tsx_retransmit( tsx, 0 ); |
| 3077 | if (status != PJ_SUCCESS) { |
| 3078 | return status; |
| 3079 | } |
| 3080 | |
| 3081 | } else { |
| 3082 | pj_time_val timeout; |
| 3083 | |
| 3084 | /* Process incoming ACK request. */ |
| 3085 | |
| 3086 | /* Verify that this is an INVITE transaction */ |
| 3087 | if (tsx->method.id != PJSIP_INVITE_METHOD) { |
| 3088 | PJ_LOG(2, (tsx->obj_name, |
| 3089 | "Received illegal ACK for %.*s transaction", |
| 3090 | (int)tsx->method.name.slen, |
| 3091 | tsx->method.name.ptr)); |
| 3092 | return PJSIP_EINVALIDMETHOD; |
| 3093 | } |
| 3094 | |
| 3095 | /* Cease retransmission. */ |
| 3096 | tsx_cancel_timer(tsx, &tsx->retransmit_timer); |
| 3097 | |
| 3098 | tsx->transport_flag &= ~(TSX_HAS_PENDING_RESCHED); |
| 3099 | |
| 3100 | /* Reschedule timeout timer. */ |
| 3101 | lock_timer(tsx); |
| 3102 | tsx_cancel_timer( tsx, &tsx->timeout_timer ); |
| 3103 | |
| 3104 | /* Timer I is T4 timer for unreliable transports, and |
| 3105 | * zero seconds for reliable transports. |
| 3106 | */ |
| 3107 | if (!tsx->is_reliable) { |
| 3108 | timeout.sec = 0; |
| 3109 | timeout.msec = 0; |
| 3110 | } else { |
| 3111 | timeout.sec = t4_timer_val.sec; |
| 3112 | timeout.msec = t4_timer_val.msec; |
| 3113 | } |
| 3114 | tsx_schedule_timer( tsx, &tsx->timeout_timer, |
| 3115 | &timeout, TIMEOUT_TIMER); |
| 3116 | unlock_timer(tsx); |
| 3117 | |
| 3118 | /* Move state to "Confirmed" */ |
| 3119 | tsx_set_state( tsx, PJSIP_TSX_STATE_CONFIRMED, |
| 3120 | PJSIP_EVENT_RX_MSG, event->body.rx_msg.rdata ); |
| 3121 | } |
| 3122 | |
| 3123 | } else if (event->type == PJSIP_EVENT_TIMER) { |
| 3124 | |
| 3125 | if (event->body.timer.entry == &tsx->retransmit_timer) { |
| 3126 | /* Retransmit message. */ |
| 3127 | pj_status_t status; |
| 3128 | |
| 3129 | status = tsx_retransmit( tsx, 1 ); |
| 3130 | if (status != PJ_SUCCESS) { |
| 3131 | return status; |
| 3132 | } |
| 3133 | |
| 3134 | } else { |
| 3135 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 3136 | |
| 3137 | /* For INVITE, this means that ACK was never received. |
| 3138 | * Set state to Terminated, and inform TU. |
| 3139 | */ |
| 3140 | |
| 3141 | tsx_set_status_code(tsx, PJSIP_SC_TSX_TIMEOUT, NULL); |
| 3142 | |
| 3143 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 3144 | PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| 3145 | |
| 3146 | //return PJSIP_ETSXDESTROYED; |
| 3147 | |
| 3148 | } else { |
| 3149 | /* Transaction terminated, it can now be deleted. */ |
| 3150 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 3151 | PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| 3152 | //return PJSIP_ETSXDESTROYED; |
| 3153 | } |
| 3154 | } |
| 3155 | |
| 3156 | } else { |
| 3157 | /* Ignore request to transmit. */ |
| 3158 | PJ_ASSERT_RETURN(event->type == PJSIP_EVENT_TX_MSG && |
| 3159 | event->body.tx_msg.tdata == tsx->last_tx, |
| 3160 | PJ_EINVALIDOP); |
| 3161 | } |
| 3162 | |
| 3163 | return PJ_SUCCESS; |
| 3164 | } |
| 3165 | |
| 3166 | |
| 3167 | /* |
| 3168 | * Handler for events in Completed state for UAC transaction. |
| 3169 | */ |
| 3170 | static pj_status_t tsx_on_state_completed_uac( pjsip_transaction *tsx, |
| 3171 | pjsip_event *event) |
| 3172 | { |
| 3173 | pj_assert(tsx->state == PJSIP_TSX_STATE_COMPLETED); |
| 3174 | |
| 3175 | if (event->type == PJSIP_EVENT_TIMER) { |
| 3176 | /* Must be the timeout timer. */ |
| 3177 | pj_assert(event->body.timer.entry == &tsx->timeout_timer); |
| 3178 | |
| 3179 | /* Move to Terminated state. */ |
| 3180 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 3181 | PJSIP_EVENT_TIMER, event->body.timer.entry ); |
| 3182 | |
| 3183 | /* Transaction has been destroyed. */ |
| 3184 | //return PJSIP_ETSXDESTROYED; |
| 3185 | |
| 3186 | } else if (event->type == PJSIP_EVENT_RX_MSG) { |
| 3187 | if (tsx->method.id == PJSIP_INVITE_METHOD) { |
| 3188 | /* On received of final response retransmission, retransmit the ACK. |
| 3189 | * TU doesn't need to be informed. |
| 3190 | */ |
| 3191 | pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| 3192 | pj_assert(msg->type == PJSIP_RESPONSE_MSG); |
| 3193 | if (msg->type==PJSIP_RESPONSE_MSG && |
| 3194 | msg->line.status.code >= 200) |
| 3195 | { |
| 3196 | pj_status_t status; |
| 3197 | |
| 3198 | status = tsx_retransmit( tsx, 0 ); |
| 3199 | if (status != PJ_SUCCESS) { |
| 3200 | return status; |
| 3201 | } |
| 3202 | } else { |
| 3203 | /* Very late retransmission of privisional response. */ |
| 3204 | pj_assert( msg->type == PJSIP_RESPONSE_MSG ); |
| 3205 | } |
| 3206 | } else { |
| 3207 | /* Just drop the response. */ |
| 3208 | } |
| 3209 | |
| 3210 | } else { |
| 3211 | pj_assert(!"Unexpected event"); |
| 3212 | return PJ_EINVALIDOP; |
| 3213 | } |
| 3214 | |
| 3215 | return PJ_SUCCESS; |
| 3216 | } |
| 3217 | |
| 3218 | |
| 3219 | /* |
| 3220 | * Handler for events in state Confirmed. |
| 3221 | */ |
| 3222 | static pj_status_t tsx_on_state_confirmed( pjsip_transaction *tsx, |
| 3223 | pjsip_event *event) |
| 3224 | { |
| 3225 | pj_assert(tsx->state == PJSIP_TSX_STATE_CONFIRMED); |
| 3226 | |
| 3227 | /* This state is only for UAS for INVITE. */ |
| 3228 | pj_assert(tsx->role == PJSIP_ROLE_UAS); |
| 3229 | pj_assert(tsx->method.id == PJSIP_INVITE_METHOD); |
| 3230 | |
| 3231 | /* Absorb any ACK received. */ |
| 3232 | if (event->type == PJSIP_EVENT_RX_MSG) { |
| 3233 | |
| 3234 | pjsip_msg *msg = event->body.rx_msg.rdata->msg_info.msg; |
| 3235 | |
| 3236 | /* Only expecting request message. */ |
| 3237 | if (msg->type != PJSIP_REQUEST_MSG) |
| 3238 | return PJSIP_ENOTREQUESTMSG; |
| 3239 | |
| 3240 | /* Must be an ACK request or a late INVITE retransmission. */ |
| 3241 | pj_assert(msg->line.req.method.id == PJSIP_ACK_METHOD || |
| 3242 | msg->line.req.method.id == PJSIP_INVITE_METHOD); |
| 3243 | |
| 3244 | } else if (event->type == PJSIP_EVENT_TIMER) { |
| 3245 | /* Must be from timeout_timer_. */ |
| 3246 | pj_assert(event->body.timer.entry == &tsx->timeout_timer); |
| 3247 | |
| 3248 | /* Move to Terminated state. */ |
| 3249 | tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, |
| 3250 | PJSIP_EVENT_TIMER, &tsx->timeout_timer ); |
| 3251 | |
| 3252 | /* Transaction has been destroyed. */ |
| 3253 | //return PJSIP_ETSXDESTROYED; |
| 3254 | |
| 3255 | } else { |
| 3256 | pj_assert(!"Unexpected event"); |
| 3257 | return PJ_EBUG; |
| 3258 | } |
| 3259 | |
| 3260 | return PJ_SUCCESS; |
| 3261 | } |
| 3262 | |
| 3263 | |
| 3264 | /* |
| 3265 | * Handler for events in state Terminated. |
| 3266 | */ |
| 3267 | static pj_status_t tsx_on_state_terminated( pjsip_transaction *tsx, |
| 3268 | pjsip_event *event) |
| 3269 | { |
| 3270 | pj_assert(tsx->state == PJSIP_TSX_STATE_TERMINATED); |
| 3271 | |
| 3272 | /* Ignore events other than timer. This used to be an assertion but |
| 3273 | * events may genuinely arrive at this state. |
| 3274 | */ |
| 3275 | if (event->type != PJSIP_EVENT_TIMER) { |
| 3276 | return PJ_EIGNORED; |
| 3277 | } |
| 3278 | |
| 3279 | /* Destroy this transaction */ |
| 3280 | tsx_set_state(tsx, PJSIP_TSX_STATE_DESTROYED, |
| 3281 | event->type, event->body.user.user1 ); |
| 3282 | |
| 3283 | return PJ_SUCCESS; |
| 3284 | } |
| 3285 | |
| 3286 | |
| 3287 | /* |
| 3288 | * Handler for events in state Destroyed. |
| 3289 | * Shouldn't happen! |
| 3290 | */ |
| 3291 | static pj_status_t tsx_on_state_destroyed(pjsip_transaction *tsx, |
| 3292 | pjsip_event *event) |
| 3293 | { |
| 3294 | PJ_UNUSED_ARG(tsx); |
| 3295 | PJ_UNUSED_ARG(event); |
| 3296 | |
| 3297 | // See https://trac.pjsip.org/repos/ticket/1432 |
| 3298 | //pj_assert(!"Not expecting any events!!"); |
| 3299 | |
| 3300 | return PJ_EIGNORED; |
| 3301 | } |
| 3302 | |