Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id: server.c 4360 2013-02-21 11:26:35Z bennylp $ */ |
| 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 "turn.h" |
| 21 | #include "auth.h" |
| 22 | |
| 23 | #define MAX_CLIENTS 32 |
| 24 | #define MAX_PEERS_PER_CLIENT 8 |
| 25 | //#define MAX_HANDLES (MAX_CLIENTS*MAX_PEERS_PER_CLIENT+MAX_LISTENERS) |
| 26 | #define MAX_HANDLES PJ_IOQUEUE_MAX_HANDLES |
| 27 | #define MAX_TIMER (MAX_HANDLES * 2) |
| 28 | #define MIN_PORT 49152 |
| 29 | #define MAX_PORT 65535 |
| 30 | #define MAX_LISTENERS 16 |
| 31 | #define MAX_THREADS 2 |
| 32 | #define MAX_NET_EVENTS 1000 |
| 33 | |
| 34 | /* Prototypes */ |
| 35 | static int server_thread_proc(void *arg); |
| 36 | static pj_status_t on_tx_stun_msg( pj_stun_session *sess, |
| 37 | void *token, |
| 38 | const void *pkt, |
| 39 | pj_size_t pkt_size, |
| 40 | const pj_sockaddr_t *dst_addr, |
| 41 | unsigned addr_len); |
| 42 | static pj_status_t on_rx_stun_request(pj_stun_session *sess, |
| 43 | const pj_uint8_t *pkt, |
| 44 | unsigned pkt_len, |
| 45 | const pj_stun_rx_data *rdata, |
| 46 | void *user_data, |
| 47 | const pj_sockaddr_t *src_addr, |
| 48 | unsigned src_addr_len); |
| 49 | |
| 50 | struct saved_cred |
| 51 | { |
| 52 | pj_str_t realm; |
| 53 | pj_str_t username; |
| 54 | pj_str_t nonce; |
| 55 | int data_type; |
| 56 | pj_str_t data; |
| 57 | }; |
| 58 | |
| 59 | |
| 60 | /* |
| 61 | * Get transport type name, normally for logging purpose only. |
| 62 | */ |
| 63 | PJ_DEF(const char*) pj_turn_tp_type_name(int tp_type) |
| 64 | { |
| 65 | /* Must be 3 characters long! */ |
| 66 | if (tp_type == PJ_TURN_TP_UDP) { |
| 67 | return "UDP"; |
| 68 | } else if (tp_type == PJ_TURN_TP_TCP) { |
| 69 | return "TCP"; |
| 70 | } else { |
| 71 | pj_assert(!"Unsupported transport"); |
| 72 | return "???"; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Create server. |
| 78 | */ |
| 79 | PJ_DEF(pj_status_t) pj_turn_srv_create(pj_pool_factory *pf, |
| 80 | pj_turn_srv **p_srv) |
| 81 | { |
| 82 | pj_pool_t *pool; |
| 83 | pj_stun_session_cb sess_cb; |
| 84 | pj_turn_srv *srv; |
| 85 | unsigned i; |
| 86 | pj_status_t status; |
| 87 | |
| 88 | PJ_ASSERT_RETURN(pf && p_srv, PJ_EINVAL); |
| 89 | |
| 90 | /* Create server and init core settings */ |
| 91 | pool = pj_pool_create(pf, "srv%p", 1000, 1000, NULL); |
| 92 | srv = PJ_POOL_ZALLOC_T(pool, pj_turn_srv); |
| 93 | srv->obj_name = pool->obj_name; |
| 94 | srv->core.pf = pf; |
| 95 | srv->core.pool = pool; |
| 96 | srv->core.tls_key = srv->core.tls_data = -1; |
| 97 | |
| 98 | /* Create ioqueue */ |
| 99 | status = pj_ioqueue_create(pool, MAX_HANDLES, &srv->core.ioqueue); |
| 100 | if (status != PJ_SUCCESS) |
| 101 | goto on_error; |
| 102 | |
| 103 | /* Server mutex */ |
| 104 | status = pj_lock_create_recursive_mutex(pool, srv->obj_name, |
| 105 | &srv->core.lock); |
| 106 | if (status != PJ_SUCCESS) |
| 107 | goto on_error; |
| 108 | |
| 109 | /* Allocate TLS */ |
| 110 | status = pj_thread_local_alloc(&srv->core.tls_key); |
| 111 | if (status != PJ_SUCCESS) |
| 112 | goto on_error; |
| 113 | |
| 114 | status = pj_thread_local_alloc(&srv->core.tls_data); |
| 115 | if (status != PJ_SUCCESS) |
| 116 | goto on_error; |
| 117 | |
| 118 | /* Create timer heap */ |
| 119 | status = pj_timer_heap_create(pool, MAX_TIMER, &srv->core.timer_heap); |
| 120 | if (status != PJ_SUCCESS) |
| 121 | goto on_error; |
| 122 | |
| 123 | /* Configure lock for the timer heap */ |
| 124 | pj_timer_heap_set_lock(srv->core.timer_heap, srv->core.lock, PJ_FALSE); |
| 125 | |
| 126 | /* Array of listeners */ |
| 127 | srv->core.listener = (pj_turn_listener**) |
| 128 | pj_pool_calloc(pool, MAX_LISTENERS, |
| 129 | sizeof(srv->core.listener[0])); |
| 130 | |
| 131 | /* Create hash tables */ |
| 132 | srv->tables.alloc = pj_hash_create(pool, MAX_CLIENTS); |
| 133 | srv->tables.res = pj_hash_create(pool, MAX_CLIENTS); |
| 134 | |
| 135 | /* Init ports settings */ |
| 136 | srv->ports.min_udp = srv->ports.next_udp = MIN_PORT; |
| 137 | srv->ports.max_udp = MAX_PORT; |
| 138 | srv->ports.min_tcp = srv->ports.next_tcp = MIN_PORT; |
| 139 | srv->ports.max_tcp = MAX_PORT; |
| 140 | |
| 141 | /* Init STUN config */ |
| 142 | pj_stun_config_init(&srv->core.stun_cfg, pf, 0, srv->core.ioqueue, |
| 143 | srv->core.timer_heap); |
| 144 | |
| 145 | /* Init STUN credential */ |
| 146 | srv->core.cred.type = PJ_STUN_AUTH_CRED_DYNAMIC; |
| 147 | srv->core.cred.data.dyn_cred.user_data = srv; |
| 148 | srv->core.cred.data.dyn_cred.get_auth = &pj_turn_get_auth; |
| 149 | srv->core.cred.data.dyn_cred.get_password = &pj_turn_get_password; |
| 150 | srv->core.cred.data.dyn_cred.verify_nonce = &pj_turn_verify_nonce; |
| 151 | |
| 152 | /* Create STUN session to handle new allocation */ |
| 153 | pj_bzero(&sess_cb, sizeof(sess_cb)); |
| 154 | sess_cb.on_rx_request = &on_rx_stun_request; |
| 155 | sess_cb.on_send_msg = &on_tx_stun_msg; |
| 156 | |
| 157 | status = pj_stun_session_create(&srv->core.stun_cfg, srv->obj_name, |
| 158 | &sess_cb, PJ_FALSE, NULL, |
| 159 | &srv->core.stun_sess); |
| 160 | if (status != PJ_SUCCESS) { |
| 161 | goto on_error; |
| 162 | } |
| 163 | |
| 164 | pj_stun_session_set_user_data(srv->core.stun_sess, srv); |
| 165 | pj_stun_session_set_credential(srv->core.stun_sess, PJ_STUN_AUTH_LONG_TERM, |
| 166 | &srv->core.cred); |
| 167 | |
| 168 | |
| 169 | /* Array of worker threads */ |
| 170 | srv->core.thread_cnt = MAX_THREADS; |
| 171 | srv->core.thread = (pj_thread_t**) |
| 172 | pj_pool_calloc(pool, srv->core.thread_cnt, |
| 173 | sizeof(pj_thread_t*)); |
| 174 | |
| 175 | /* Start the worker threads */ |
| 176 | for (i=0; i<srv->core.thread_cnt; ++i) { |
| 177 | status = pj_thread_create(pool, srv->obj_name, &server_thread_proc, |
| 178 | srv, 0, 0, &srv->core.thread[i]); |
| 179 | if (status != PJ_SUCCESS) |
| 180 | goto on_error; |
| 181 | } |
| 182 | |
| 183 | /* We're done. Application should add listeners now */ |
| 184 | PJ_LOG(4,(srv->obj_name, "TURN server v%s is running", |
| 185 | pj_get_version())); |
| 186 | |
| 187 | *p_srv = srv; |
| 188 | return PJ_SUCCESS; |
| 189 | |
| 190 | on_error: |
| 191 | pj_turn_srv_destroy(srv); |
| 192 | return status; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | /* |
| 197 | * Handle timer and network events |
| 198 | */ |
| 199 | static void srv_handle_events(pj_turn_srv *srv, const pj_time_val *max_timeout) |
| 200 | { |
| 201 | /* timeout is 'out' var. This just to make compiler happy. */ |
| 202 | pj_time_val timeout = { 0, 0}; |
| 203 | unsigned net_event_count = 0; |
| 204 | int c; |
| 205 | |
| 206 | /* Poll the timer. The timer heap has its own mutex for better |
| 207 | * granularity, so we don't need to lock the server. |
| 208 | */ |
| 209 | timeout.sec = timeout.msec = 0; |
| 210 | c = pj_timer_heap_poll( srv->core.timer_heap, &timeout ); |
| 211 | |
| 212 | /* timer_heap_poll should never ever returns negative value, or otherwise |
| 213 | * ioqueue_poll() will block forever! |
| 214 | */ |
| 215 | pj_assert(timeout.sec >= 0 && timeout.msec >= 0); |
| 216 | if (timeout.msec >= 1000) timeout.msec = 999; |
| 217 | |
| 218 | /* If caller specifies maximum time to wait, then compare the value with |
| 219 | * the timeout to wait from timer, and use the minimum value. |
| 220 | */ |
| 221 | if (max_timeout && PJ_TIME_VAL_GT(timeout, *max_timeout)) { |
| 222 | timeout = *max_timeout; |
| 223 | } |
| 224 | |
| 225 | /* Poll ioqueue. |
| 226 | * Repeat polling the ioqueue while we have immediate events, because |
| 227 | * timer heap may process more than one events, so if we only process |
| 228 | * one network events at a time (such as when IOCP backend is used), |
| 229 | * the ioqueue may have trouble keeping up with the request rate. |
| 230 | * |
| 231 | * For example, for each send() request, one network event will be |
| 232 | * reported by ioqueue for the send() completion. If we don't poll |
| 233 | * the ioqueue often enough, the send() completion will not be |
| 234 | * reported in timely manner. |
| 235 | */ |
| 236 | do { |
| 237 | c = pj_ioqueue_poll( srv->core.ioqueue, &timeout); |
| 238 | if (c < 0) { |
| 239 | pj_thread_sleep(PJ_TIME_VAL_MSEC(timeout)); |
| 240 | return; |
| 241 | } else if (c == 0) { |
| 242 | break; |
| 243 | } else { |
| 244 | net_event_count += c; |
| 245 | timeout.sec = timeout.msec = 0; |
| 246 | } |
| 247 | } while (c > 0 && net_event_count < MAX_NET_EVENTS); |
| 248 | |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Server worker thread proc. |
| 253 | */ |
| 254 | static int server_thread_proc(void *arg) |
| 255 | { |
| 256 | pj_turn_srv *srv = (pj_turn_srv*)arg; |
| 257 | |
| 258 | while (!srv->core.quit) { |
| 259 | pj_time_val timeout_max = {0, 100}; |
| 260 | srv_handle_events(srv, &timeout_max); |
| 261 | } |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Destroy the server. |
| 268 | */ |
| 269 | PJ_DEF(pj_status_t) pj_turn_srv_destroy(pj_turn_srv *srv) |
| 270 | { |
| 271 | pj_hash_iterator_t itbuf, *it; |
| 272 | unsigned i; |
| 273 | |
| 274 | /* Stop all worker threads */ |
| 275 | srv->core.quit = PJ_TRUE; |
| 276 | for (i=0; i<srv->core.thread_cnt; ++i) { |
| 277 | if (srv->core.thread[i]) { |
| 278 | pj_thread_join(srv->core.thread[i]); |
| 279 | pj_thread_destroy(srv->core.thread[i]); |
| 280 | srv->core.thread[i] = NULL; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | /* Destroy all allocations FIRST */ |
| 285 | if (srv->tables.alloc) { |
| 286 | it = pj_hash_first(srv->tables.alloc, &itbuf); |
| 287 | while (it != NULL) { |
| 288 | pj_turn_allocation *alloc = (pj_turn_allocation*) |
| 289 | pj_hash_this(srv->tables.alloc, it); |
| 290 | pj_hash_iterator_t *next = pj_hash_next(srv->tables.alloc, it); |
| 291 | pj_turn_allocation_destroy(alloc); |
| 292 | it = next; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* Destroy all listeners. */ |
| 297 | for (i=0; i<srv->core.lis_cnt; ++i) { |
| 298 | if (srv->core.listener[i]) { |
| 299 | pj_turn_listener_destroy(srv->core.listener[i]); |
| 300 | srv->core.listener[i] = NULL; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | /* Destroy STUN session */ |
| 305 | if (srv->core.stun_sess) { |
| 306 | pj_stun_session_destroy(srv->core.stun_sess); |
| 307 | srv->core.stun_sess = NULL; |
| 308 | } |
| 309 | |
| 310 | /* Destroy hash tables (well, sort of) */ |
| 311 | if (srv->tables.alloc) { |
| 312 | srv->tables.alloc = NULL; |
| 313 | srv->tables.res = NULL; |
| 314 | } |
| 315 | |
| 316 | /* Destroy timer heap */ |
| 317 | if (srv->core.timer_heap) { |
| 318 | pj_timer_heap_destroy(srv->core.timer_heap); |
| 319 | srv->core.timer_heap = NULL; |
| 320 | } |
| 321 | |
| 322 | /* Destroy ioqueue */ |
| 323 | if (srv->core.ioqueue) { |
| 324 | pj_ioqueue_destroy(srv->core.ioqueue); |
| 325 | srv->core.ioqueue = NULL; |
| 326 | } |
| 327 | |
| 328 | /* Destroy thread local IDs */ |
| 329 | if (srv->core.tls_key != -1) { |
| 330 | pj_thread_local_free(srv->core.tls_key); |
| 331 | srv->core.tls_key = -1; |
| 332 | } |
| 333 | if (srv->core.tls_data != -1) { |
| 334 | pj_thread_local_free(srv->core.tls_data); |
| 335 | srv->core.tls_data = -1; |
| 336 | } |
| 337 | |
| 338 | /* Destroy server lock */ |
| 339 | if (srv->core.lock) { |
| 340 | pj_lock_destroy(srv->core.lock); |
| 341 | srv->core.lock = NULL; |
| 342 | } |
| 343 | |
| 344 | /* Release pool */ |
| 345 | if (srv->core.pool) { |
| 346 | pj_pool_t *pool = srv->core.pool; |
| 347 | srv->core.pool = NULL; |
| 348 | pj_pool_release(pool); |
| 349 | } |
| 350 | |
| 351 | /* Done */ |
| 352 | return PJ_SUCCESS; |
| 353 | } |
| 354 | |
| 355 | |
| 356 | /* |
| 357 | * Add listener. |
| 358 | */ |
| 359 | PJ_DEF(pj_status_t) pj_turn_srv_add_listener(pj_turn_srv *srv, |
| 360 | pj_turn_listener *lis) |
| 361 | { |
| 362 | unsigned index; |
| 363 | |
| 364 | PJ_ASSERT_RETURN(srv && lis, PJ_EINVAL); |
| 365 | PJ_ASSERT_RETURN(srv->core.lis_cnt < MAX_LISTENERS, PJ_ETOOMANY); |
| 366 | |
| 367 | /* Add to array */ |
| 368 | index = srv->core.lis_cnt; |
| 369 | srv->core.listener[index] = lis; |
| 370 | lis->server = srv; |
| 371 | lis->id = index; |
| 372 | srv->core.lis_cnt++; |
| 373 | |
| 374 | PJ_LOG(4,(srv->obj_name, "Listener %s/%s added at index %d", |
| 375 | lis->obj_name, lis->info, lis->id)); |
| 376 | |
| 377 | return PJ_SUCCESS; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | /* |
| 382 | * Destroy listener. |
| 383 | */ |
| 384 | PJ_DEF(pj_status_t) pj_turn_listener_destroy(pj_turn_listener *listener) |
| 385 | { |
| 386 | pj_turn_srv *srv = listener->server; |
| 387 | unsigned i; |
| 388 | |
| 389 | /* Remove from our listener list */ |
| 390 | pj_lock_acquire(srv->core.lock); |
| 391 | for (i=0; i<srv->core.lis_cnt; ++i) { |
| 392 | if (srv->core.listener[i] == listener) { |
| 393 | srv->core.listener[i] = NULL; |
| 394 | srv->core.lis_cnt--; |
| 395 | listener->id = PJ_TURN_INVALID_LIS_ID; |
| 396 | break; |
| 397 | } |
| 398 | } |
| 399 | pj_lock_release(srv->core.lock); |
| 400 | |
| 401 | /* Destroy */ |
| 402 | return listener->destroy(listener); |
| 403 | } |
| 404 | |
| 405 | |
| 406 | /** |
| 407 | * Add a reference to a transport. |
| 408 | */ |
| 409 | PJ_DEF(void) pj_turn_transport_add_ref( pj_turn_transport *transport, |
| 410 | pj_turn_allocation *alloc) |
| 411 | { |
| 412 | transport->add_ref(transport, alloc); |
| 413 | } |
| 414 | |
| 415 | |
| 416 | /** |
| 417 | * Decrement transport reference counter. |
| 418 | */ |
| 419 | PJ_DEF(void) pj_turn_transport_dec_ref( pj_turn_transport *transport, |
| 420 | pj_turn_allocation *alloc) |
| 421 | { |
| 422 | transport->dec_ref(transport, alloc); |
| 423 | } |
| 424 | |
| 425 | |
| 426 | /* |
| 427 | * Register an allocation to the hash tables. |
| 428 | */ |
| 429 | PJ_DEF(pj_status_t) pj_turn_srv_register_allocation(pj_turn_srv *srv, |
| 430 | pj_turn_allocation *alloc) |
| 431 | { |
| 432 | /* Add to hash tables */ |
| 433 | pj_lock_acquire(srv->core.lock); |
| 434 | pj_hash_set(alloc->pool, srv->tables.alloc, |
| 435 | &alloc->hkey, sizeof(alloc->hkey), 0, alloc); |
| 436 | pj_hash_set(alloc->pool, srv->tables.res, |
| 437 | &alloc->relay.hkey, sizeof(alloc->relay.hkey), 0, |
| 438 | &alloc->relay); |
| 439 | pj_lock_release(srv->core.lock); |
| 440 | |
| 441 | return PJ_SUCCESS; |
| 442 | } |
| 443 | |
| 444 | |
| 445 | /* |
| 446 | * Unregister an allocation from the hash tables. |
| 447 | */ |
| 448 | PJ_DEF(pj_status_t) pj_turn_srv_unregister_allocation(pj_turn_srv *srv, |
| 449 | pj_turn_allocation *alloc) |
| 450 | { |
| 451 | /* Unregister from hash tables */ |
| 452 | pj_lock_acquire(srv->core.lock); |
| 453 | pj_hash_set(alloc->pool, srv->tables.alloc, |
| 454 | &alloc->hkey, sizeof(alloc->hkey), 0, NULL); |
| 455 | pj_hash_set(alloc->pool, srv->tables.res, |
| 456 | &alloc->relay.hkey, sizeof(alloc->relay.hkey), 0, NULL); |
| 457 | pj_lock_release(srv->core.lock); |
| 458 | |
| 459 | return PJ_SUCCESS; |
| 460 | } |
| 461 | |
| 462 | |
| 463 | /* Callback from our own STUN session whenever it needs to send |
| 464 | * outgoing STUN packet. |
| 465 | */ |
| 466 | static pj_status_t on_tx_stun_msg( pj_stun_session *sess, |
| 467 | void *token, |
| 468 | const void *pdu, |
| 469 | pj_size_t pdu_size, |
| 470 | const pj_sockaddr_t *dst_addr, |
| 471 | unsigned addr_len) |
| 472 | { |
| 473 | pj_turn_transport *transport = (pj_turn_transport*) token; |
| 474 | |
| 475 | PJ_ASSERT_RETURN(transport!=NULL, PJ_EINVALIDOP); |
| 476 | |
| 477 | PJ_UNUSED_ARG(sess); |
| 478 | |
| 479 | return transport->sendto(transport, pdu, pdu_size, 0, |
| 480 | dst_addr, addr_len); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /* Respond to STUN request */ |
| 485 | static pj_status_t stun_respond(pj_stun_session *sess, |
| 486 | pj_turn_transport *transport, |
| 487 | const pj_stun_rx_data *rdata, |
| 488 | unsigned code, |
| 489 | const char *errmsg, |
| 490 | pj_bool_t cache, |
| 491 | const pj_sockaddr_t *dst_addr, |
| 492 | unsigned addr_len) |
| 493 | { |
| 494 | pj_status_t status; |
| 495 | pj_str_t reason; |
| 496 | pj_stun_tx_data *tdata; |
| 497 | |
| 498 | /* Create response */ |
| 499 | status = pj_stun_session_create_res(sess, rdata, code, |
| 500 | (errmsg?pj_cstr(&reason,errmsg):NULL), |
| 501 | &tdata); |
| 502 | if (status != PJ_SUCCESS) |
| 503 | return status; |
| 504 | |
| 505 | /* Send the response */ |
| 506 | return pj_stun_session_send_msg(sess, transport, cache, PJ_FALSE, |
| 507 | dst_addr, addr_len, tdata); |
| 508 | } |
| 509 | |
| 510 | |
| 511 | /* Callback from our own STUN session when incoming request arrives. |
| 512 | * This function is triggered by pj_stun_session_on_rx_pkt() call in |
| 513 | * pj_turn_srv_on_rx_pkt() function below. |
| 514 | */ |
| 515 | static pj_status_t on_rx_stun_request(pj_stun_session *sess, |
| 516 | const pj_uint8_t *pdu, |
| 517 | unsigned pdu_len, |
| 518 | const pj_stun_rx_data *rdata, |
| 519 | void *token, |
| 520 | const pj_sockaddr_t *src_addr, |
| 521 | unsigned src_addr_len) |
| 522 | { |
| 523 | pj_turn_transport *transport; |
| 524 | const pj_stun_msg *msg = rdata->msg; |
| 525 | pj_turn_srv *srv; |
| 526 | pj_turn_allocation *alloc; |
| 527 | pj_status_t status; |
| 528 | |
| 529 | PJ_UNUSED_ARG(pdu); |
| 530 | PJ_UNUSED_ARG(pdu_len); |
| 531 | |
| 532 | transport = (pj_turn_transport*) token; |
| 533 | srv = transport->listener->server; |
| 534 | |
| 535 | /* Respond any requests other than ALLOCATE with 437 response */ |
| 536 | if (msg->hdr.type != PJ_STUN_ALLOCATE_REQUEST) { |
| 537 | stun_respond(sess, transport, rdata, PJ_STUN_SC_ALLOCATION_MISMATCH, |
| 538 | NULL, PJ_FALSE, src_addr, src_addr_len); |
| 539 | return PJ_SUCCESS; |
| 540 | } |
| 541 | |
| 542 | /* Create new allocation. The relay resource will be allocated |
| 543 | * in this function. |
| 544 | */ |
| 545 | status = pj_turn_allocation_create(transport, src_addr, src_addr_len, |
| 546 | rdata, sess, &alloc); |
| 547 | if (status != PJ_SUCCESS) { |
| 548 | /* STUN response has been sent, no need to reply here */ |
| 549 | return PJ_SUCCESS; |
| 550 | } |
| 551 | |
| 552 | /* Done. */ |
| 553 | return PJ_SUCCESS; |
| 554 | } |
| 555 | |
| 556 | /* Handle STUN Binding request */ |
| 557 | static void handle_binding_request(pj_turn_pkt *pkt, |
| 558 | unsigned options) |
| 559 | { |
| 560 | pj_stun_msg *request, *response; |
| 561 | pj_uint8_t pdu[200]; |
| 562 | pj_size_t len; |
| 563 | pj_status_t status; |
| 564 | |
| 565 | /* Decode request */ |
| 566 | status = pj_stun_msg_decode(pkt->pool, pkt->pkt, pkt->len, options, |
| 567 | &request, NULL, NULL); |
| 568 | if (status != PJ_SUCCESS) |
| 569 | return; |
| 570 | |
| 571 | /* Create response */ |
| 572 | status = pj_stun_msg_create_response(pkt->pool, request, 0, NULL, |
| 573 | &response); |
| 574 | if (status != PJ_SUCCESS) |
| 575 | return; |
| 576 | |
| 577 | /* Add XOR-MAPPED-ADDRESS */ |
| 578 | pj_stun_msg_add_sockaddr_attr(pkt->pool, response, |
| 579 | PJ_STUN_ATTR_XOR_MAPPED_ADDR, |
| 580 | PJ_TRUE, |
| 581 | &pkt->src.clt_addr, |
| 582 | pkt->src_addr_len); |
| 583 | |
| 584 | /* Encode */ |
| 585 | status = pj_stun_msg_encode(response, pdu, sizeof(pdu), 0, NULL, &len); |
| 586 | if (status != PJ_SUCCESS) |
| 587 | return; |
| 588 | |
| 589 | /* Send response */ |
| 590 | pkt->transport->sendto(pkt->transport, pdu, len, 0, |
| 591 | &pkt->src.clt_addr, pkt->src_addr_len); |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * This callback is called by UDP listener on incoming packet. This is |
| 596 | * the first entry for incoming packet (from client) to the server. From |
| 597 | * here, the packet may be handed over to an allocation if an allocation |
| 598 | * is found for the client address, or handed over to owned STUN session |
| 599 | * if an allocation is not found. |
| 600 | */ |
| 601 | PJ_DEF(void) pj_turn_srv_on_rx_pkt(pj_turn_srv *srv, |
| 602 | pj_turn_pkt *pkt) |
| 603 | { |
| 604 | pj_turn_allocation *alloc; |
| 605 | |
| 606 | /* Get TURN allocation from the source address */ |
| 607 | pj_lock_acquire(srv->core.lock); |
| 608 | alloc = (pj_turn_allocation*) |
| 609 | pj_hash_get(srv->tables.alloc, &pkt->src, sizeof(pkt->src), NULL); |
| 610 | pj_lock_release(srv->core.lock); |
| 611 | |
| 612 | /* If allocation is found, just hand over the packet to the |
| 613 | * allocation. |
| 614 | */ |
| 615 | if (alloc) { |
| 616 | pj_turn_allocation_on_rx_client_pkt(alloc, pkt); |
| 617 | } else { |
| 618 | /* Otherwise this is a new client */ |
| 619 | unsigned options; |
| 620 | pj_size_t parsed_len; |
| 621 | pj_status_t status; |
| 622 | |
| 623 | /* Check that this is a STUN message */ |
| 624 | options = PJ_STUN_CHECK_PACKET | PJ_STUN_NO_FINGERPRINT_CHECK; |
| 625 | if (pkt->transport->listener->tp_type == PJ_TURN_TP_UDP) |
| 626 | options |= PJ_STUN_IS_DATAGRAM; |
| 627 | |
| 628 | status = pj_stun_msg_check(pkt->pkt, pkt->len, options); |
| 629 | if (status != PJ_SUCCESS) { |
| 630 | /* If the first byte are not STUN, drop the packet. First byte |
| 631 | * of STUN message is always 0x00 or 0x01. Otherwise wait for |
| 632 | * more data as the data might have come from TCP. |
| 633 | * |
| 634 | * Also drop packet if it's unreasonably too big, as this might |
| 635 | * indicate invalid data that's building up in the buffer. |
| 636 | * |
| 637 | * Or if packet is a datagram. |
| 638 | */ |
| 639 | if ((*pkt->pkt != 0x00 && *pkt->pkt != 0x01) || |
| 640 | pkt->len > 1600 || |
| 641 | (options & PJ_STUN_IS_DATAGRAM)) |
| 642 | { |
| 643 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 644 | char ip[PJ_INET6_ADDRSTRLEN+10]; |
| 645 | |
| 646 | pkt->len = 0; |
| 647 | |
| 648 | pj_strerror(status, errmsg, sizeof(errmsg)); |
| 649 | PJ_LOG(5,(srv->obj_name, |
| 650 | "Non-STUN packet from %s is dropped: %s", |
| 651 | pj_sockaddr_print(&pkt->src.clt_addr, ip, sizeof(ip), 3), |
| 652 | errmsg)); |
| 653 | } |
| 654 | return; |
| 655 | } |
| 656 | |
| 657 | /* Special handling for Binding Request. We won't give it to the |
| 658 | * STUN session since this request is not authenticated. |
| 659 | */ |
| 660 | if (pkt->pkt[1] == 1) { |
| 661 | handle_binding_request(pkt, options); |
| 662 | return; |
| 663 | } |
| 664 | |
| 665 | /* Hand over processing to STUN session. This will trigger |
| 666 | * on_rx_stun_request() callback to be called if the STUN |
| 667 | * message is a request. |
| 668 | */ |
| 669 | options &= ~PJ_STUN_CHECK_PACKET; |
| 670 | parsed_len = 0; |
| 671 | status = pj_stun_session_on_rx_pkt(srv->core.stun_sess, pkt->pkt, |
| 672 | pkt->len, options, pkt->transport, |
| 673 | &parsed_len, &pkt->src.clt_addr, |
| 674 | pkt->src_addr_len); |
| 675 | if (status != PJ_SUCCESS) { |
| 676 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 677 | char ip[PJ_INET6_ADDRSTRLEN+10]; |
| 678 | |
| 679 | pj_strerror(status, errmsg, sizeof(errmsg)); |
| 680 | PJ_LOG(5,(srv->obj_name, |
| 681 | "Error processing STUN packet from %s: %s", |
| 682 | pj_sockaddr_print(&pkt->src.clt_addr, ip, sizeof(ip), 3), |
| 683 | errmsg)); |
| 684 | } |
| 685 | |
| 686 | if (pkt->transport->listener->tp_type == PJ_TURN_TP_UDP) { |
| 687 | pkt->len = 0; |
| 688 | } else if (parsed_len > 0) { |
| 689 | if (parsed_len == pkt->len) { |
| 690 | pkt->len = 0; |
| 691 | } else { |
| 692 | pj_memmove(pkt->pkt, pkt->pkt+parsed_len, |
| 693 | pkt->len - parsed_len); |
| 694 | pkt->len -= parsed_len; |
| 695 | } |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | |