Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [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 "turn.h" |
| 21 | #include "auth.h" |
| 22 | |
| 23 | |
| 24 | #define THIS_FILE "allocation.c" |
| 25 | |
| 26 | |
| 27 | enum { |
| 28 | TIMER_ID_NONE, |
| 29 | TIMER_ID_TIMEOUT, |
| 30 | TIMER_ID_DESTROY |
| 31 | }; |
| 32 | |
| 33 | #define DESTROY_DELAY {0, 500} |
| 34 | #define PEER_TABLE_SIZE 32 |
| 35 | |
| 36 | #define MAX_CLIENT_BANDWIDTH 128 /* In Kbps */ |
| 37 | #define DEFA_CLIENT_BANDWIDTH 64 |
| 38 | |
| 39 | #define MIN_LIFETIME 30 |
| 40 | #define MAX_LIFETIME 600 |
| 41 | #define DEF_LIFETIME 300 |
| 42 | |
| 43 | |
| 44 | /* Parsed Allocation request. */ |
| 45 | typedef struct alloc_request |
| 46 | { |
| 47 | unsigned tp_type; /* Requested transport */ |
| 48 | char addr[PJ_INET6_ADDRSTRLEN]; /* Requested IP */ |
| 49 | unsigned bandwidth; /* Requested bandwidth */ |
| 50 | unsigned lifetime; /* Lifetime. */ |
| 51 | unsigned rpp_bits; /* A bits */ |
| 52 | unsigned rpp_port; /* Requested port */ |
| 53 | } alloc_request; |
| 54 | |
| 55 | |
| 56 | |
| 57 | /* Prototypes */ |
| 58 | static void destroy_allocation(pj_turn_allocation *alloc); |
| 59 | static pj_status_t create_relay(pj_turn_srv *srv, |
| 60 | pj_turn_allocation *alloc, |
| 61 | const pj_stun_msg *msg, |
| 62 | const alloc_request *req, |
| 63 | pj_turn_relay_res *relay); |
| 64 | static void destroy_relay(pj_turn_relay_res *relay); |
| 65 | static void on_rx_from_peer(pj_ioqueue_key_t *key, |
| 66 | pj_ioqueue_op_key_t *op_key, |
| 67 | pj_ssize_t bytes_read); |
| 68 | static pj_status_t stun_on_send_msg(pj_stun_session *sess, |
| 69 | void *token, |
| 70 | const void *pkt, |
| 71 | pj_size_t pkt_size, |
| 72 | const pj_sockaddr_t *dst_addr, |
| 73 | unsigned addr_len); |
| 74 | static pj_status_t stun_on_rx_request(pj_stun_session *sess, |
| 75 | const pj_uint8_t *pkt, |
| 76 | unsigned pkt_len, |
| 77 | const pj_stun_rx_data *rdata, |
| 78 | void *token, |
| 79 | const pj_sockaddr_t *src_addr, |
| 80 | unsigned src_addr_len); |
| 81 | static pj_status_t stun_on_rx_indication(pj_stun_session *sess, |
| 82 | const pj_uint8_t *pkt, |
| 83 | unsigned pkt_len, |
| 84 | const pj_stun_msg *msg, |
| 85 | void *token, |
| 86 | const pj_sockaddr_t *src_addr, |
| 87 | unsigned src_addr_len); |
| 88 | |
| 89 | /* Log allocation error */ |
| 90 | static void alloc_err(pj_turn_allocation *alloc, const char *title, |
| 91 | pj_status_t status) |
| 92 | { |
| 93 | char errmsg[PJ_ERR_MSG_SIZE]; |
| 94 | |
| 95 | pj_strerror(status, errmsg, sizeof(errmsg)); |
| 96 | PJ_LOG(4,(alloc->obj_name, "%s for client %s: %s", |
| 97 | title, alloc->info, errmsg)); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | /* Parse ALLOCATE request */ |
| 102 | static pj_status_t parse_allocate_req(alloc_request *cfg, |
| 103 | pj_stun_session *sess, |
| 104 | const pj_stun_rx_data *rdata, |
| 105 | const pj_sockaddr_t *src_addr, |
| 106 | unsigned src_addr_len) |
| 107 | { |
| 108 | const pj_stun_msg *req = rdata->msg; |
| 109 | pj_stun_bandwidth_attr *attr_bw; |
| 110 | pj_stun_req_transport_attr *attr_req_tp; |
| 111 | pj_stun_res_token_attr *attr_res_token; |
| 112 | pj_stun_lifetime_attr *attr_lifetime; |
| 113 | |
| 114 | pj_bzero(cfg, sizeof(*cfg)); |
| 115 | |
| 116 | /* Get BANDWIDTH attribute, if any. */ |
| 117 | attr_bw = (pj_stun_uint_attr*) |
| 118 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_BANDWIDTH, 0); |
| 119 | if (attr_bw) { |
| 120 | cfg->bandwidth = attr_bw->value; |
| 121 | } else { |
| 122 | cfg->bandwidth = DEFA_CLIENT_BANDWIDTH; |
| 123 | } |
| 124 | |
| 125 | /* Check if we can satisfy the bandwidth */ |
| 126 | if (cfg->bandwidth > MAX_CLIENT_BANDWIDTH) { |
| 127 | pj_stun_session_respond(sess, rdata, |
| 128 | PJ_STUN_SC_ALLOCATION_QUOTA_REACHED, |
| 129 | "Invalid bandwidth", NULL, PJ_TRUE, |
| 130 | src_addr, src_addr_len); |
| 131 | return PJ_STATUS_FROM_STUN_CODE(PJ_STUN_SC_ALLOCATION_QUOTA_REACHED); |
| 132 | } |
| 133 | |
| 134 | /* MUST have REQUESTED-TRANSPORT attribute */ |
| 135 | attr_req_tp = (pj_stun_uint_attr*) |
| 136 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_REQ_TRANSPORT, 0); |
| 137 | if (attr_req_tp == NULL) { |
| 138 | pj_stun_session_respond(sess, rdata, PJ_STUN_SC_BAD_REQUEST, |
| 139 | "Missing REQUESTED-TRANSPORT attribute", |
| 140 | NULL, PJ_TRUE, src_addr, src_addr_len); |
| 141 | return PJ_STATUS_FROM_STUN_CODE(PJ_STUN_SC_BAD_REQUEST); |
| 142 | } |
| 143 | |
| 144 | cfg->tp_type = PJ_STUN_GET_RT_PROTO(attr_req_tp->value); |
| 145 | |
| 146 | /* Can only support UDP for now */ |
| 147 | if (cfg->tp_type != PJ_TURN_TP_UDP) { |
| 148 | pj_stun_session_respond(sess, rdata, PJ_STUN_SC_UNSUPP_TRANSPORT_PROTO, |
| 149 | NULL, NULL, PJ_TRUE, src_addr, src_addr_len); |
| 150 | return PJ_STATUS_FROM_STUN_CODE(PJ_STUN_SC_UNSUPP_TRANSPORT_PROTO); |
| 151 | } |
| 152 | |
| 153 | /* Get RESERVATION-TOKEN attribute, if any */ |
| 154 | attr_res_token = (pj_stun_res_token_attr*) |
| 155 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_RESERVATION_TOKEN, |
| 156 | 0); |
| 157 | if (attr_res_token) { |
| 158 | /* We don't support RESERVATION-TOKEN for now */ |
| 159 | pj_stun_session_respond(sess, rdata, |
| 160 | PJ_STUN_SC_BAD_REQUEST, |
| 161 | "RESERVATION-TOKEN is not supported", NULL, |
| 162 | PJ_TRUE, src_addr, src_addr_len); |
| 163 | return PJ_STATUS_FROM_STUN_CODE(PJ_STUN_SC_BAD_REQUEST); |
| 164 | } |
| 165 | |
| 166 | /* Get LIFETIME attribute */ |
| 167 | attr_lifetime = (pj_stun_uint_attr*) |
| 168 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_LIFETIME, 0); |
| 169 | if (attr_lifetime) { |
| 170 | cfg->lifetime = attr_lifetime->value; |
| 171 | if (cfg->lifetime < MIN_LIFETIME) { |
| 172 | pj_stun_session_respond(sess, rdata, PJ_STUN_SC_BAD_REQUEST, |
| 173 | "LIFETIME too short", NULL, |
| 174 | PJ_TRUE, src_addr, src_addr_len); |
| 175 | return PJ_STATUS_FROM_STUN_CODE(PJ_STUN_SC_BAD_REQUEST); |
| 176 | } |
| 177 | if (cfg->lifetime > MAX_LIFETIME) |
| 178 | cfg->lifetime = MAX_LIFETIME; |
| 179 | } else { |
| 180 | cfg->lifetime = DEF_LIFETIME; |
| 181 | } |
| 182 | |
| 183 | return PJ_SUCCESS; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /* Respond to ALLOCATE request */ |
| 188 | static pj_status_t send_allocate_response(pj_turn_allocation *alloc, |
| 189 | pj_stun_session *srv_sess, |
| 190 | pj_turn_transport *transport, |
| 191 | const pj_stun_rx_data *rdata) |
| 192 | { |
| 193 | pj_stun_tx_data *tdata; |
| 194 | pj_status_t status; |
| 195 | |
| 196 | /* Respond the original ALLOCATE request */ |
| 197 | status = pj_stun_session_create_res(srv_sess, rdata, 0, NULL, &tdata); |
| 198 | if (status != PJ_SUCCESS) |
| 199 | return status; |
| 200 | |
| 201 | /* Add XOR-RELAYED-ADDRESS attribute */ |
| 202 | pj_stun_msg_add_sockaddr_attr(tdata->pool, tdata->msg, |
| 203 | PJ_STUN_ATTR_XOR_RELAYED_ADDR, PJ_TRUE, |
| 204 | &alloc->relay.hkey.addr, |
| 205 | pj_sockaddr_get_len(&alloc->relay.hkey.addr)); |
| 206 | |
| 207 | /* Add LIFETIME. */ |
| 208 | pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| 209 | PJ_STUN_ATTR_LIFETIME, |
| 210 | (unsigned)alloc->relay.lifetime); |
| 211 | |
| 212 | /* Add BANDWIDTH */ |
| 213 | pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| 214 | PJ_STUN_ATTR_BANDWIDTH, |
| 215 | alloc->bandwidth); |
| 216 | |
| 217 | /* Add RESERVATION-TOKEN */ |
| 218 | PJ_TODO(ADD_RESERVATION_TOKEN); |
| 219 | |
| 220 | /* Add XOR-MAPPED-ADDRESS */ |
| 221 | pj_stun_msg_add_sockaddr_attr(tdata->pool, tdata->msg, |
| 222 | PJ_STUN_ATTR_XOR_MAPPED_ADDR, PJ_TRUE, |
| 223 | &alloc->hkey.clt_addr, |
| 224 | pj_sockaddr_get_len(&alloc->hkey.clt_addr)); |
| 225 | |
| 226 | /* Send the response */ |
| 227 | return pj_stun_session_send_msg(srv_sess, transport, PJ_TRUE, |
| 228 | PJ_FALSE, &alloc->hkey.clt_addr, |
| 229 | pj_sockaddr_get_len(&alloc->hkey.clt_addr), |
| 230 | tdata); |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | * Init credential for the allocation. We use static credential, meaning that |
| 236 | * the user's password must not change during allocation. |
| 237 | */ |
| 238 | static pj_status_t init_cred(pj_turn_allocation *alloc, const pj_stun_msg *req) |
| 239 | { |
| 240 | const pj_stun_username_attr *user; |
| 241 | const pj_stun_realm_attr *realm; |
| 242 | const pj_stun_nonce_attr *nonce; |
| 243 | pj_status_t status; |
| 244 | |
| 245 | realm = (const pj_stun_realm_attr*) |
| 246 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_REALM, 0); |
| 247 | PJ_ASSERT_RETURN(realm != NULL, PJ_EBUG); |
| 248 | |
| 249 | user = (const pj_stun_username_attr*) |
| 250 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_USERNAME, 0); |
| 251 | PJ_ASSERT_RETURN(user != NULL, PJ_EBUG); |
| 252 | |
| 253 | nonce = (const pj_stun_nonce_attr*) |
| 254 | pj_stun_msg_find_attr(req, PJ_STUN_ATTR_NONCE, 0); |
| 255 | PJ_ASSERT_RETURN(nonce != NULL, PJ_EBUG); |
| 256 | |
| 257 | /* Lookup the password */ |
| 258 | status = pj_turn_get_password(NULL, NULL, &realm->value, |
| 259 | &user->value, alloc->pool, |
| 260 | &alloc->cred.data.static_cred.data_type, |
| 261 | &alloc->cred.data.static_cred.data); |
| 262 | if (status != PJ_SUCCESS) |
| 263 | return status; |
| 264 | |
| 265 | /* Save credential */ |
| 266 | alloc->cred.type = PJ_STUN_AUTH_CRED_STATIC; |
| 267 | pj_strdup(alloc->pool, &alloc->cred.data.static_cred.realm, &realm->value); |
| 268 | pj_strdup(alloc->pool, &alloc->cred.data.static_cred.username, &user->value); |
| 269 | pj_strdup(alloc->pool, &alloc->cred.data.static_cred.nonce, &nonce->value); |
| 270 | |
| 271 | return PJ_SUCCESS; |
| 272 | } |
| 273 | |
| 274 | |
| 275 | /* |
| 276 | * Create new allocation. |
| 277 | */ |
| 278 | PJ_DEF(pj_status_t) pj_turn_allocation_create(pj_turn_transport *transport, |
| 279 | const pj_sockaddr_t *src_addr, |
| 280 | unsigned src_addr_len, |
| 281 | const pj_stun_rx_data *rdata, |
| 282 | pj_stun_session *srv_sess, |
| 283 | pj_turn_allocation **p_alloc) |
| 284 | { |
| 285 | pj_turn_srv *srv = transport->listener->server; |
| 286 | const pj_stun_msg *msg = rdata->msg; |
| 287 | pj_pool_t *pool; |
| 288 | alloc_request req; |
| 289 | pj_turn_allocation *alloc; |
| 290 | pj_stun_session_cb sess_cb; |
| 291 | char str_tmp[80]; |
| 292 | pj_status_t status; |
| 293 | |
| 294 | /* Parse ALLOCATE request */ |
| 295 | status = parse_allocate_req(&req, srv_sess, rdata, src_addr, src_addr_len); |
| 296 | if (status != PJ_SUCCESS) |
| 297 | return status; |
| 298 | |
| 299 | pool = pj_pool_create(srv->core.pf, "alloc%p", 1000, 1000, NULL); |
| 300 | |
| 301 | /* Init allocation structure */ |
| 302 | alloc = PJ_POOL_ZALLOC_T(pool, pj_turn_allocation); |
| 303 | alloc->pool = pool; |
| 304 | alloc->obj_name = pool->obj_name; |
| 305 | alloc->relay.tp.sock = PJ_INVALID_SOCKET; |
| 306 | alloc->server = transport->listener->server; |
| 307 | |
| 308 | alloc->bandwidth = req.bandwidth; |
| 309 | |
| 310 | /* Set transport */ |
| 311 | alloc->transport = transport; |
| 312 | pj_turn_transport_add_ref(transport, alloc); |
| 313 | |
| 314 | alloc->hkey.tp_type = transport->listener->tp_type; |
| 315 | pj_memcpy(&alloc->hkey.clt_addr, src_addr, src_addr_len); |
| 316 | |
| 317 | status = pj_lock_create_recursive_mutex(pool, alloc->obj_name, |
| 318 | &alloc->lock); |
| 319 | if (status != PJ_SUCCESS) { |
| 320 | goto on_error; |
| 321 | } |
| 322 | |
| 323 | /* Create peer hash table */ |
| 324 | alloc->peer_table = pj_hash_create(pool, PEER_TABLE_SIZE); |
| 325 | |
| 326 | /* Create channel hash table */ |
| 327 | alloc->ch_table = pj_hash_create(pool, PEER_TABLE_SIZE); |
| 328 | |
| 329 | /* Print info */ |
| 330 | pj_ansi_strcpy(alloc->info, |
| 331 | pj_turn_tp_type_name(transport->listener->tp_type)); |
| 332 | alloc->info[3] = ':'; |
| 333 | pj_sockaddr_print(src_addr, alloc->info+4, sizeof(alloc->info)-4, 3); |
| 334 | |
| 335 | /* Create STUN session to handle STUN communication with client */ |
| 336 | pj_bzero(&sess_cb, sizeof(sess_cb)); |
| 337 | sess_cb.on_send_msg = &stun_on_send_msg; |
| 338 | sess_cb.on_rx_request = &stun_on_rx_request; |
| 339 | sess_cb.on_rx_indication = &stun_on_rx_indication; |
| 340 | status = pj_stun_session_create(&srv->core.stun_cfg, alloc->obj_name, |
| 341 | &sess_cb, PJ_FALSE, NULL, &alloc->sess); |
| 342 | if (status != PJ_SUCCESS) { |
| 343 | goto on_error; |
| 344 | } |
| 345 | |
| 346 | /* Attach to STUN session */ |
| 347 | pj_stun_session_set_user_data(alloc->sess, alloc); |
| 348 | |
| 349 | /* Init authentication credential */ |
| 350 | status = init_cred(alloc, msg); |
| 351 | if (status != PJ_SUCCESS) { |
| 352 | goto on_error; |
| 353 | } |
| 354 | |
| 355 | /* Attach authentication credential to STUN session */ |
| 356 | pj_stun_session_set_credential(alloc->sess, PJ_STUN_AUTH_LONG_TERM, |
| 357 | &alloc->cred); |
| 358 | |
| 359 | /* Create the relay resource */ |
| 360 | status = create_relay(srv, alloc, msg, &req, &alloc->relay); |
| 361 | if (status != PJ_SUCCESS) { |
| 362 | goto on_error; |
| 363 | } |
| 364 | |
| 365 | /* Register this allocation */ |
| 366 | pj_turn_srv_register_allocation(srv, alloc); |
| 367 | |
| 368 | /* Respond to ALLOCATE request */ |
| 369 | status = send_allocate_response(alloc, srv_sess, transport, rdata); |
| 370 | if (status != PJ_SUCCESS) |
| 371 | goto on_error; |
| 372 | |
| 373 | /* Done */ |
| 374 | pj_sockaddr_print(&alloc->relay.hkey.addr, str_tmp, |
| 375 | sizeof(str_tmp), 3); |
| 376 | PJ_LOG(4,(alloc->obj_name, "Client %s created, relay addr=%s:%s", |
| 377 | alloc->info, pj_turn_tp_type_name(req.tp_type), str_tmp)); |
| 378 | |
| 379 | /* Success */ |
| 380 | *p_alloc = alloc; |
| 381 | return PJ_SUCCESS; |
| 382 | |
| 383 | on_error: |
| 384 | /* Send reply to the ALLOCATE request */ |
| 385 | pj_strerror(status, str_tmp, sizeof(str_tmp)); |
| 386 | pj_stun_session_respond(srv_sess, rdata, PJ_STUN_SC_BAD_REQUEST, str_tmp, |
| 387 | transport, PJ_TRUE, src_addr, src_addr_len); |
| 388 | |
| 389 | /* Cleanup */ |
| 390 | destroy_allocation(alloc); |
| 391 | return status; |
| 392 | } |
| 393 | |
| 394 | |
| 395 | /* Destroy relay resource */ |
| 396 | static void destroy_relay(pj_turn_relay_res *relay) |
| 397 | { |
| 398 | if (relay->timer.id) { |
| 399 | pj_timer_heap_cancel(relay->allocation->server->core.timer_heap, |
| 400 | &relay->timer); |
| 401 | relay->timer.id = PJ_FALSE; |
| 402 | } |
| 403 | |
| 404 | if (relay->tp.key) { |
| 405 | pj_ioqueue_unregister(relay->tp.key); |
| 406 | relay->tp.key = NULL; |
| 407 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 408 | } else if (relay->tp.sock != PJ_INVALID_SOCKET) { |
| 409 | pj_sock_close(relay->tp.sock); |
| 410 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 411 | } |
| 412 | |
| 413 | /* Mark as shutdown */ |
| 414 | relay->lifetime = 0; |
| 415 | } |
| 416 | |
| 417 | |
| 418 | /* |
| 419 | * Really destroy allocation. |
| 420 | */ |
| 421 | static void destroy_allocation(pj_turn_allocation *alloc) |
| 422 | { |
| 423 | pj_pool_t *pool; |
| 424 | |
| 425 | /* Unregister this allocation */ |
| 426 | pj_turn_srv_unregister_allocation(alloc->server, alloc); |
| 427 | |
| 428 | /* Destroy relay */ |
| 429 | destroy_relay(&alloc->relay); |
| 430 | |
| 431 | /* Must lock only after destroying relay otherwise deadlock */ |
| 432 | if (alloc->lock) { |
| 433 | pj_lock_acquire(alloc->lock); |
| 434 | } |
| 435 | |
| 436 | /* Unreference transport */ |
| 437 | if (alloc->transport) { |
| 438 | pj_turn_transport_dec_ref(alloc->transport, alloc); |
| 439 | alloc->transport = NULL; |
| 440 | } |
| 441 | |
| 442 | /* Destroy STUN session */ |
| 443 | if (alloc->sess) { |
| 444 | pj_stun_session_destroy(alloc->sess); |
| 445 | alloc->sess = NULL; |
| 446 | } |
| 447 | |
| 448 | /* Destroy lock */ |
| 449 | if (alloc->lock) { |
| 450 | pj_lock_release(alloc->lock); |
| 451 | pj_lock_destroy(alloc->lock); |
| 452 | alloc->lock = NULL; |
| 453 | } |
| 454 | |
| 455 | /* Destroy pool */ |
| 456 | pool = alloc->pool; |
| 457 | if (pool) { |
| 458 | alloc->pool = NULL; |
| 459 | pj_pool_release(pool); |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | |
| 464 | PJ_DECL(void) pj_turn_allocation_destroy(pj_turn_allocation *alloc) |
| 465 | { |
| 466 | destroy_allocation(alloc); |
| 467 | } |
| 468 | |
| 469 | |
| 470 | /* |
| 471 | * Handle transport closure. |
| 472 | */ |
| 473 | PJ_DEF(void) pj_turn_allocation_on_transport_closed( pj_turn_allocation *alloc, |
| 474 | pj_turn_transport *tp) |
| 475 | { |
| 476 | PJ_LOG(5,(alloc->obj_name, "Transport %s unexpectedly closed, destroying " |
| 477 | "allocation %s", tp->info, alloc->info)); |
| 478 | pj_turn_transport_dec_ref(tp, alloc); |
| 479 | alloc->transport = NULL; |
| 480 | destroy_allocation(alloc); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /* Initiate shutdown sequence for this allocation and start destroy timer. |
| 485 | * Once allocation is marked as shutting down, any packets will be |
| 486 | * rejected/discarded |
| 487 | */ |
| 488 | static void alloc_shutdown(pj_turn_allocation *alloc) |
| 489 | { |
| 490 | pj_time_val destroy_delay = DESTROY_DELAY; |
| 491 | |
| 492 | /* Work with existing schedule */ |
| 493 | if (alloc->relay.timer.id == TIMER_ID_TIMEOUT) { |
| 494 | /* Cancel existing shutdown timer */ |
| 495 | pj_timer_heap_cancel(alloc->server->core.timer_heap, |
| 496 | &alloc->relay.timer); |
| 497 | alloc->relay.timer.id = TIMER_ID_NONE; |
| 498 | |
| 499 | } else if (alloc->relay.timer.id == TIMER_ID_DESTROY) { |
| 500 | /* We've been scheduled to be destroyed, ignore this |
| 501 | * shutdown request. |
| 502 | */ |
| 503 | return; |
| 504 | } |
| 505 | |
| 506 | pj_assert(alloc->relay.timer.id == TIMER_ID_NONE); |
| 507 | |
| 508 | /* Shutdown relay socket */ |
| 509 | destroy_relay(&alloc->relay); |
| 510 | |
| 511 | /* Don't unregister from hash table because we still need to |
| 512 | * handle REFRESH retransmission. |
| 513 | */ |
| 514 | |
| 515 | /* Schedule destroy timer */ |
| 516 | alloc->relay.timer.id = TIMER_ID_DESTROY; |
| 517 | pj_timer_heap_schedule(alloc->server->core.timer_heap, |
| 518 | &alloc->relay.timer, &destroy_delay); |
| 519 | } |
| 520 | |
| 521 | |
| 522 | /* Reschedule timeout using current lifetime setting */ |
| 523 | static pj_status_t resched_timeout(pj_turn_allocation *alloc) |
| 524 | { |
| 525 | pj_time_val delay; |
| 526 | pj_status_t status; |
| 527 | |
| 528 | pj_gettimeofday(&alloc->relay.expiry); |
| 529 | alloc->relay.expiry.sec += alloc->relay.lifetime; |
| 530 | |
| 531 | pj_assert(alloc->relay.timer.id != TIMER_ID_DESTROY); |
| 532 | if (alloc->relay.timer.id != 0) { |
| 533 | pj_timer_heap_cancel(alloc->server->core.timer_heap, |
| 534 | &alloc->relay.timer); |
| 535 | alloc->relay.timer.id = TIMER_ID_NONE; |
| 536 | } |
| 537 | |
| 538 | delay.sec = alloc->relay.lifetime; |
| 539 | delay.msec = 0; |
| 540 | |
| 541 | alloc->relay.timer.id = TIMER_ID_TIMEOUT; |
| 542 | status = pj_timer_heap_schedule(alloc->server->core.timer_heap, |
| 543 | &alloc->relay.timer, &delay); |
| 544 | if (status != PJ_SUCCESS) { |
| 545 | alloc->relay.timer.id = TIMER_ID_NONE; |
| 546 | return status; |
| 547 | } |
| 548 | |
| 549 | return PJ_SUCCESS; |
| 550 | } |
| 551 | |
| 552 | |
| 553 | /* Timer timeout callback */ |
| 554 | static void relay_timeout_cb(pj_timer_heap_t *heap, pj_timer_entry *e) |
| 555 | { |
| 556 | pj_turn_relay_res *rel; |
| 557 | pj_turn_allocation *alloc; |
| 558 | |
| 559 | PJ_UNUSED_ARG(heap); |
| 560 | |
| 561 | rel = (pj_turn_relay_res*) e->user_data; |
| 562 | alloc = rel->allocation; |
| 563 | |
| 564 | if (e->id == TIMER_ID_TIMEOUT) { |
| 565 | |
| 566 | e->id = TIMER_ID_NONE; |
| 567 | |
| 568 | PJ_LOG(4,(alloc->obj_name, |
| 569 | "Client %s refresh timed-out, shutting down..", |
| 570 | alloc->info)); |
| 571 | |
| 572 | alloc_shutdown(alloc); |
| 573 | |
| 574 | } else if (e->id == TIMER_ID_DESTROY) { |
| 575 | e->id = TIMER_ID_NONE; |
| 576 | |
| 577 | PJ_LOG(4,(alloc->obj_name, "Client %s destroying..", |
| 578 | alloc->info)); |
| 579 | |
| 580 | destroy_allocation(alloc); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | |
| 585 | /* |
| 586 | * Create relay. |
| 587 | */ |
| 588 | static pj_status_t create_relay(pj_turn_srv *srv, |
| 589 | pj_turn_allocation *alloc, |
| 590 | const pj_stun_msg *msg, |
| 591 | const alloc_request *req, |
| 592 | pj_turn_relay_res *relay) |
| 593 | { |
| 594 | enum { RETRY = 40 }; |
| 595 | pj_pool_t *pool = alloc->pool; |
| 596 | int retry, retry_max, sock_type; |
| 597 | pj_ioqueue_callback icb; |
| 598 | int af, namelen; |
| 599 | pj_stun_string_attr *sa; |
| 600 | pj_status_t status; |
| 601 | |
| 602 | pj_bzero(relay, sizeof(*relay)); |
| 603 | |
| 604 | relay->allocation = alloc; |
| 605 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 606 | |
| 607 | /* TODO: get the requested address family from somewhere */ |
| 608 | af = alloc->transport->listener->addr.addr.sa_family; |
| 609 | |
| 610 | /* Save realm */ |
| 611 | sa = (pj_stun_string_attr*) |
| 612 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_REALM, 0); |
| 613 | PJ_ASSERT_RETURN(sa, PJ_EINVALIDOP); |
| 614 | pj_strdup(pool, &relay->realm, &sa->value); |
| 615 | |
| 616 | /* Save username */ |
| 617 | sa = (pj_stun_string_attr*) |
| 618 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_USERNAME, 0); |
| 619 | PJ_ASSERT_RETURN(sa, PJ_EINVALIDOP); |
| 620 | pj_strdup(pool, &relay->user, &sa->value); |
| 621 | |
| 622 | /* Lifetime and timeout */ |
| 623 | relay->lifetime = req->lifetime; |
| 624 | pj_timer_entry_init(&relay->timer, TIMER_ID_NONE, relay, |
| 625 | &relay_timeout_cb); |
| 626 | resched_timeout(alloc); |
| 627 | |
| 628 | /* Transport type */ |
| 629 | relay->hkey.tp_type = req->tp_type; |
| 630 | |
| 631 | /* Create the socket */ |
| 632 | if (req->tp_type == PJ_TURN_TP_UDP) { |
| 633 | sock_type = pj_SOCK_DGRAM(); |
| 634 | } else if (req->tp_type == PJ_TURN_TP_TCP) { |
| 635 | sock_type = pj_SOCK_STREAM(); |
| 636 | } else { |
| 637 | pj_assert(!"Unknown transport"); |
| 638 | return PJ_EINVALIDOP; |
| 639 | } |
| 640 | |
| 641 | status = pj_sock_socket(af, sock_type, 0, &relay->tp.sock); |
| 642 | if (status != PJ_SUCCESS) { |
| 643 | pj_bzero(relay, sizeof(*relay)); |
| 644 | return status; |
| 645 | } |
| 646 | |
| 647 | /* Find suitable port for this allocation */ |
| 648 | if (req->rpp_port) { |
| 649 | retry_max = 1; |
| 650 | } else { |
| 651 | retry_max = RETRY; |
| 652 | } |
| 653 | |
| 654 | for (retry=0; retry<retry_max; ++retry) { |
| 655 | pj_uint16_t port; |
| 656 | pj_sockaddr bound_addr; |
| 657 | |
| 658 | pj_lock_acquire(srv->core.lock); |
| 659 | |
| 660 | if (req->rpp_port) { |
| 661 | port = (pj_uint16_t) req->rpp_port; |
| 662 | } else if (req->tp_type == PJ_TURN_TP_UDP) { |
| 663 | port = (pj_uint16_t) srv->ports.next_udp++; |
| 664 | if (srv->ports.next_udp > srv->ports.max_udp) |
| 665 | srv->ports.next_udp = srv->ports.min_udp; |
| 666 | } else if (req->tp_type == PJ_TURN_TP_TCP) { |
| 667 | port = (pj_uint16_t) srv->ports.next_tcp++; |
| 668 | if (srv->ports.next_tcp > srv->ports.max_tcp) |
| 669 | srv->ports.next_tcp = srv->ports.min_tcp; |
| 670 | } else { |
| 671 | pj_assert(!"Invalid transport"); |
| 672 | port = 0; |
| 673 | } |
| 674 | |
| 675 | pj_lock_release(srv->core.lock); |
| 676 | |
| 677 | pj_sockaddr_init(af, &bound_addr, NULL, port); |
| 678 | |
| 679 | status = pj_sock_bind(relay->tp.sock, &bound_addr, |
| 680 | pj_sockaddr_get_len(&bound_addr)); |
| 681 | if (status == PJ_SUCCESS) |
| 682 | break; |
| 683 | } |
| 684 | |
| 685 | if (status != PJ_SUCCESS) { |
| 686 | /* Unable to allocate port */ |
| 687 | PJ_LOG(4,(THIS_FILE, "Unable to allocate relay, giving up: err %d", |
| 688 | status)); |
| 689 | pj_sock_close(relay->tp.sock); |
| 690 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 691 | return status; |
| 692 | } |
| 693 | |
| 694 | /* Init relay key */ |
| 695 | namelen = sizeof(relay->hkey.addr); |
| 696 | status = pj_sock_getsockname(relay->tp.sock, &relay->hkey.addr, &namelen); |
| 697 | if (status != PJ_SUCCESS) { |
| 698 | PJ_LOG(4,(THIS_FILE, "pj_sock_getsockname() failed: err %d", |
| 699 | status)); |
| 700 | pj_sock_close(relay->tp.sock); |
| 701 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 702 | return status; |
| 703 | } |
| 704 | if (!pj_sockaddr_has_addr(&relay->hkey.addr)) { |
| 705 | pj_sockaddr_copy_addr(&relay->hkey.addr, |
| 706 | &alloc->transport->listener->addr); |
| 707 | } |
| 708 | if (!pj_sockaddr_has_addr(&relay->hkey.addr)) { |
| 709 | pj_sockaddr tmp_addr; |
| 710 | pj_gethostip(af, &tmp_addr); |
| 711 | pj_sockaddr_copy_addr(&relay->hkey.addr, &tmp_addr); |
| 712 | } |
| 713 | |
| 714 | /* Init ioqueue */ |
| 715 | pj_bzero(&icb, sizeof(icb)); |
| 716 | icb.on_read_complete = &on_rx_from_peer; |
| 717 | |
| 718 | status = pj_ioqueue_register_sock(pool, srv->core.ioqueue, relay->tp.sock, |
| 719 | relay, &icb, &relay->tp.key); |
| 720 | if (status != PJ_SUCCESS) { |
| 721 | PJ_LOG(4,(THIS_FILE, "pj_ioqueue_register_sock() failed: err %d", |
| 722 | status)); |
| 723 | pj_sock_close(relay->tp.sock); |
| 724 | relay->tp.sock = PJ_INVALID_SOCKET; |
| 725 | return status; |
| 726 | } |
| 727 | |
| 728 | /* Kick off pending read operation */ |
| 729 | pj_ioqueue_op_key_init(&relay->tp.read_key, sizeof(relay->tp.read_key)); |
| 730 | on_rx_from_peer(relay->tp.key, &relay->tp.read_key, 0); |
| 731 | |
| 732 | /* Done */ |
| 733 | return PJ_SUCCESS; |
| 734 | } |
| 735 | |
| 736 | /* Create and send error response */ |
| 737 | static void send_reply_err(pj_turn_allocation *alloc, |
| 738 | const pj_stun_rx_data *rdata, |
| 739 | pj_bool_t cache, |
| 740 | int code, const char *errmsg) |
| 741 | { |
| 742 | pj_status_t status; |
| 743 | |
| 744 | status = pj_stun_session_respond(alloc->sess, rdata, code, errmsg, NULL, |
| 745 | cache, &alloc->hkey.clt_addr, |
| 746 | pj_sockaddr_get_len(&alloc->hkey.clt_addr.addr)); |
| 747 | if (status != PJ_SUCCESS) { |
| 748 | alloc_err(alloc, "Error sending STUN error response", status); |
| 749 | return; |
| 750 | } |
| 751 | } |
| 752 | |
| 753 | /* Create and send successful response */ |
| 754 | static void send_reply_ok(pj_turn_allocation *alloc, |
| 755 | const pj_stun_rx_data *rdata) |
| 756 | { |
| 757 | pj_status_t status; |
| 758 | unsigned interval; |
| 759 | pj_stun_tx_data *tdata; |
| 760 | |
| 761 | status = pj_stun_session_create_res(alloc->sess, rdata, 0, NULL, &tdata); |
| 762 | if (status != PJ_SUCCESS) { |
| 763 | alloc_err(alloc, "Error creating STUN success response", status); |
| 764 | return; |
| 765 | } |
| 766 | |
| 767 | /* Calculate time to expiration */ |
| 768 | if (alloc->relay.lifetime != 0) { |
| 769 | pj_time_val now; |
| 770 | pj_gettimeofday(&now); |
| 771 | interval = alloc->relay.expiry.sec - now.sec; |
| 772 | } else { |
| 773 | interval = 0; |
| 774 | } |
| 775 | |
| 776 | /* Add LIFETIME if this is not ChannelBind. */ |
| 777 | if (PJ_STUN_GET_METHOD(tdata->msg->hdr.type)!=PJ_STUN_CHANNEL_BIND_METHOD){ |
| 778 | pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| 779 | PJ_STUN_ATTR_LIFETIME, interval); |
| 780 | |
| 781 | /* Add BANDWIDTH if lifetime is not zero */ |
| 782 | if (interval != 0) { |
| 783 | pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| 784 | PJ_STUN_ATTR_BANDWIDTH, |
| 785 | alloc->bandwidth); |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | status = pj_stun_session_send_msg(alloc->sess, NULL, PJ_TRUE, |
| 790 | PJ_FALSE, &alloc->hkey.clt_addr, |
| 791 | pj_sockaddr_get_len(&alloc->hkey.clt_addr), |
| 792 | tdata); |
| 793 | if (status != PJ_SUCCESS) { |
| 794 | alloc_err(alloc, "Error sending STUN success response", status); |
| 795 | return; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | |
| 800 | /* Create new permission */ |
| 801 | static pj_turn_permission *create_permission(pj_turn_allocation *alloc, |
| 802 | const pj_sockaddr_t *peer_addr, |
| 803 | unsigned addr_len) |
| 804 | { |
| 805 | pj_turn_permission *perm; |
| 806 | |
| 807 | perm = PJ_POOL_ZALLOC_T(alloc->pool, pj_turn_permission); |
| 808 | pj_memcpy(&perm->hkey.peer_addr, peer_addr, addr_len); |
| 809 | |
| 810 | perm->allocation = alloc; |
| 811 | perm->channel = PJ_TURN_INVALID_CHANNEL; |
| 812 | |
| 813 | pj_gettimeofday(&perm->expiry); |
| 814 | perm->expiry.sec += PJ_TURN_PERM_TIMEOUT; |
| 815 | |
| 816 | /* Register to hash table (only the address part!) */ |
| 817 | pj_hash_set(alloc->pool, alloc->peer_table, |
| 818 | pj_sockaddr_get_addr(&perm->hkey.peer_addr), |
| 819 | pj_sockaddr_get_addr_len(&perm->hkey.peer_addr), 0, perm); |
| 820 | |
| 821 | return perm; |
| 822 | } |
| 823 | |
| 824 | /* Check if a permission isn't expired. Return NULL if expired. */ |
| 825 | static pj_turn_permission *check_permission_expiry(pj_turn_permission *perm) |
| 826 | { |
| 827 | pj_turn_allocation *alloc = perm->allocation; |
| 828 | pj_time_val now; |
| 829 | |
| 830 | pj_gettimeofday(&now); |
| 831 | if (PJ_TIME_VAL_GT(perm->expiry, now)) { |
| 832 | /* Permission has not expired */ |
| 833 | return perm; |
| 834 | } |
| 835 | |
| 836 | /* Remove from permission hash table */ |
| 837 | pj_hash_set(NULL, alloc->peer_table, |
| 838 | pj_sockaddr_get_addr(&perm->hkey.peer_addr), |
| 839 | pj_sockaddr_get_addr_len(&perm->hkey.peer_addr), 0, NULL); |
| 840 | |
| 841 | /* Remove from channel hash table, if assigned a channel number */ |
| 842 | if (perm->channel != PJ_TURN_INVALID_CHANNEL) { |
| 843 | pj_hash_set(NULL, alloc->ch_table, &perm->channel, |
| 844 | sizeof(perm->channel), 0, NULL); |
| 845 | } |
| 846 | |
| 847 | return NULL; |
| 848 | } |
| 849 | |
| 850 | /* Lookup permission in hash table by the peer address */ |
| 851 | static pj_turn_permission* |
| 852 | lookup_permission_by_addr(pj_turn_allocation *alloc, |
| 853 | const pj_sockaddr_t *peer_addr, |
| 854 | unsigned addr_len) |
| 855 | { |
| 856 | pj_turn_permission *perm; |
| 857 | |
| 858 | PJ_UNUSED_ARG(addr_len); |
| 859 | |
| 860 | /* Lookup in peer hash table */ |
| 861 | perm = (pj_turn_permission*) |
| 862 | pj_hash_get(alloc->peer_table, |
| 863 | pj_sockaddr_get_addr(peer_addr), |
| 864 | pj_sockaddr_get_addr_len(peer_addr), |
| 865 | NULL); |
| 866 | return perm ? check_permission_expiry(perm) : NULL; |
| 867 | } |
| 868 | |
| 869 | /* Lookup permission in hash table by the channel number */ |
| 870 | static pj_turn_permission* |
| 871 | lookup_permission_by_chnum(pj_turn_allocation *alloc, |
| 872 | unsigned chnum) |
| 873 | { |
| 874 | pj_uint16_t chnum16 = (pj_uint16_t)chnum; |
| 875 | pj_turn_permission *perm; |
| 876 | |
| 877 | /* Lookup in peer hash table */ |
| 878 | perm = (pj_turn_permission*) pj_hash_get(alloc->ch_table, &chnum16, |
| 879 | sizeof(chnum16), NULL); |
| 880 | return perm ? check_permission_expiry(perm) : NULL; |
| 881 | } |
| 882 | |
| 883 | /* Update permission because of data from client to peer. |
| 884 | * Return PJ_TRUE is permission is found. |
| 885 | */ |
| 886 | static pj_bool_t refresh_permission(pj_turn_permission *perm) |
| 887 | { |
| 888 | pj_gettimeofday(&perm->expiry); |
| 889 | if (perm->channel == PJ_TURN_INVALID_CHANNEL) |
| 890 | perm->expiry.sec += PJ_TURN_PERM_TIMEOUT; |
| 891 | else |
| 892 | perm->expiry.sec += PJ_TURN_CHANNEL_TIMEOUT; |
| 893 | return PJ_TRUE; |
| 894 | } |
| 895 | |
| 896 | /* |
| 897 | * Handle incoming packet from client. This would have been called by |
| 898 | * server upon receiving packet from a listener. |
| 899 | */ |
| 900 | PJ_DEF(void) pj_turn_allocation_on_rx_client_pkt(pj_turn_allocation *alloc, |
| 901 | pj_turn_pkt *pkt) |
| 902 | { |
| 903 | pj_bool_t is_stun; |
| 904 | pj_status_t status; |
| 905 | |
| 906 | /* Lock this allocation */ |
| 907 | pj_lock_acquire(alloc->lock); |
| 908 | |
| 909 | /* Quickly check if this is STUN message */ |
| 910 | is_stun = ((*((pj_uint8_t*)pkt->pkt) & 0xC0) == 0); |
| 911 | |
| 912 | if (is_stun) { |
| 913 | /* |
| 914 | * This could be an incoming STUN requests or indications. |
| 915 | * Pass this through to the STUN session, which will call |
| 916 | * our stun_on_rx_request() or stun_on_rx_indication() |
| 917 | * callbacks. |
| 918 | * |
| 919 | * Note: currently it is necessary to specify the |
| 920 | * PJ_STUN_NO_FINGERPRINT_CHECK otherwise the FINGERPRINT |
| 921 | * attribute inside STUN Send Indication message will mess up |
| 922 | * with fingerprint checking. |
| 923 | */ |
| 924 | unsigned options = PJ_STUN_CHECK_PACKET | PJ_STUN_NO_FINGERPRINT_CHECK; |
| 925 | pj_size_t parsed_len = 0; |
| 926 | |
| 927 | if (pkt->transport->listener->tp_type == PJ_TURN_TP_UDP) |
| 928 | options |= PJ_STUN_IS_DATAGRAM; |
| 929 | |
| 930 | status = pj_stun_session_on_rx_pkt(alloc->sess, pkt->pkt, pkt->len, |
| 931 | options, NULL, &parsed_len, |
| 932 | &pkt->src.clt_addr, |
| 933 | pkt->src_addr_len); |
| 934 | |
| 935 | if (pkt->transport->listener->tp_type == PJ_TURN_TP_UDP) { |
| 936 | pkt->len = 0; |
| 937 | } else if (parsed_len > 0) { |
| 938 | if (parsed_len == pkt->len) { |
| 939 | pkt->len = 0; |
| 940 | } else { |
| 941 | pj_memmove(pkt->pkt, pkt->pkt+parsed_len, |
| 942 | pkt->len - parsed_len); |
| 943 | pkt->len -= parsed_len; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | if (status != PJ_SUCCESS) { |
| 948 | alloc_err(alloc, "Error handling STUN packet", status); |
| 949 | goto on_return; |
| 950 | } |
| 951 | |
| 952 | } else { |
| 953 | /* |
| 954 | * This is not a STUN packet, must be ChannelData packet. |
| 955 | */ |
| 956 | pj_turn_channel_data *cd = (pj_turn_channel_data*)pkt->pkt; |
| 957 | pj_turn_permission *perm; |
| 958 | pj_ssize_t len; |
| 959 | |
| 960 | pj_assert(sizeof(*cd)==4); |
| 961 | |
| 962 | /* For UDP check the packet length */ |
| 963 | if (alloc->transport->listener->tp_type == PJ_TURN_TP_UDP) { |
| 964 | if (pkt->len < pj_ntohs(cd->length)+sizeof(*cd)) { |
| 965 | PJ_LOG(4,(alloc->obj_name, |
| 966 | "ChannelData from %s discarded: UDP size error", |
| 967 | alloc->info)); |
| 968 | goto on_return; |
| 969 | } |
| 970 | } else { |
| 971 | pj_assert(!"Unsupported transport"); |
| 972 | goto on_return; |
| 973 | } |
| 974 | |
| 975 | perm = lookup_permission_by_chnum(alloc, pj_ntohs(cd->ch_number)); |
| 976 | if (!perm) { |
| 977 | /* Discard */ |
| 978 | PJ_LOG(4,(alloc->obj_name, |
| 979 | "ChannelData from %s discarded: ch#0x%x not found", |
| 980 | alloc->info, pj_ntohs(cd->ch_number))); |
| 981 | goto on_return; |
| 982 | } |
| 983 | |
| 984 | /* Relay the data */ |
| 985 | len = pj_ntohs(cd->length); |
| 986 | pj_sock_sendto(alloc->relay.tp.sock, cd+1, &len, 0, |
| 987 | &perm->hkey.peer_addr, |
| 988 | pj_sockaddr_get_len(&perm->hkey.peer_addr)); |
| 989 | |
| 990 | /* Refresh permission */ |
| 991 | refresh_permission(perm); |
| 992 | } |
| 993 | |
| 994 | on_return: |
| 995 | /* Release lock */ |
| 996 | pj_lock_release(alloc->lock); |
| 997 | } |
| 998 | |
| 999 | |
| 1000 | /* |
| 1001 | * Handle incoming packet from peer. This function is called by |
| 1002 | * on_rx_from_peer(). |
| 1003 | */ |
| 1004 | static void handle_peer_pkt(pj_turn_allocation *alloc, |
| 1005 | pj_turn_relay_res *rel, |
| 1006 | char *pkt, pj_size_t len, |
| 1007 | const pj_sockaddr *src_addr) |
| 1008 | { |
| 1009 | pj_turn_permission *perm; |
| 1010 | |
| 1011 | /* Lookup permission */ |
| 1012 | perm = lookup_permission_by_addr(alloc, src_addr, |
| 1013 | pj_sockaddr_get_len(src_addr)); |
| 1014 | if (perm == NULL) { |
| 1015 | /* No permission, discard data */ |
| 1016 | return; |
| 1017 | } |
| 1018 | |
| 1019 | /* Send Data Indication or ChannelData, depends on whether |
| 1020 | * this permission is attached to a channel number. |
| 1021 | */ |
| 1022 | if (perm->channel != PJ_TURN_INVALID_CHANNEL) { |
| 1023 | /* Send ChannelData */ |
| 1024 | pj_turn_channel_data *cd = (pj_turn_channel_data*)rel->tp.tx_pkt; |
| 1025 | |
| 1026 | if (len > PJ_TURN_MAX_PKT_LEN) { |
| 1027 | char peer_addr[80]; |
| 1028 | pj_sockaddr_print(src_addr, peer_addr, sizeof(peer_addr), 3); |
| 1029 | PJ_LOG(4,(alloc->obj_name, "Client %s: discarded data from %s " |
| 1030 | "because it's too long (%d bytes)", |
| 1031 | alloc->info, peer_addr, len)); |
| 1032 | return; |
| 1033 | } |
| 1034 | |
| 1035 | /* Init header */ |
| 1036 | cd->ch_number = pj_htons(perm->channel); |
| 1037 | cd->length = pj_htons((pj_uint16_t)len); |
| 1038 | |
| 1039 | /* Copy data */ |
| 1040 | pj_memcpy(rel->tp.tx_pkt+sizeof(pj_turn_channel_data), pkt, len); |
| 1041 | |
| 1042 | /* Send to client */ |
| 1043 | alloc->transport->sendto(alloc->transport, rel->tp.tx_pkt, |
| 1044 | len+sizeof(pj_turn_channel_data), 0, |
| 1045 | &alloc->hkey.clt_addr, |
| 1046 | pj_sockaddr_get_len(&alloc->hkey.clt_addr)); |
| 1047 | } else { |
| 1048 | /* Send Data Indication */ |
| 1049 | pj_stun_tx_data *tdata; |
| 1050 | pj_status_t status; |
| 1051 | |
| 1052 | status = pj_stun_session_create_ind(alloc->sess, |
| 1053 | PJ_STUN_DATA_INDICATION, &tdata); |
| 1054 | if (status != PJ_SUCCESS) { |
| 1055 | alloc_err(alloc, "Error creating Data indication", status); |
| 1056 | return; |
| 1057 | } |
| 1058 | |
| 1059 | pj_stun_msg_add_sockaddr_attr(tdata->pool, tdata->msg, |
| 1060 | PJ_STUN_ATTR_XOR_PEER_ADDR, PJ_TRUE, |
| 1061 | src_addr, pj_sockaddr_get_len(src_addr)); |
| 1062 | pj_stun_msg_add_binary_attr(tdata->pool, tdata->msg, |
| 1063 | PJ_STUN_ATTR_DATA, |
| 1064 | (const pj_uint8_t*)pkt, len); |
| 1065 | |
| 1066 | pj_stun_session_send_msg(alloc->sess, NULL, PJ_FALSE, |
| 1067 | PJ_FALSE, &alloc->hkey.clt_addr, |
| 1068 | pj_sockaddr_get_len(&alloc->hkey.clt_addr), |
| 1069 | tdata); |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | /* |
| 1074 | * ioqueue notification on RX packets from the relay socket. |
| 1075 | */ |
| 1076 | static void on_rx_from_peer(pj_ioqueue_key_t *key, |
| 1077 | pj_ioqueue_op_key_t *op_key, |
| 1078 | pj_ssize_t bytes_read) |
| 1079 | { |
| 1080 | pj_turn_relay_res *rel; |
| 1081 | pj_status_t status; |
| 1082 | |
| 1083 | rel = (pj_turn_relay_res*) pj_ioqueue_get_user_data(key); |
| 1084 | |
| 1085 | /* Lock the allocation */ |
| 1086 | pj_lock_acquire(rel->allocation->lock); |
| 1087 | |
| 1088 | do { |
| 1089 | if (bytes_read > 0) { |
| 1090 | handle_peer_pkt(rel->allocation, rel, rel->tp.rx_pkt, |
| 1091 | bytes_read, &rel->tp.src_addr); |
| 1092 | } |
| 1093 | |
| 1094 | /* Read next packet */ |
| 1095 | bytes_read = sizeof(rel->tp.rx_pkt); |
| 1096 | rel->tp.src_addr_len = sizeof(rel->tp.src_addr); |
| 1097 | status = pj_ioqueue_recvfrom(key, op_key, |
| 1098 | rel->tp.rx_pkt, &bytes_read, 0, |
| 1099 | &rel->tp.src_addr, |
| 1100 | &rel->tp.src_addr_len); |
| 1101 | |
| 1102 | if (status != PJ_EPENDING && status != PJ_SUCCESS) |
| 1103 | bytes_read = -status; |
| 1104 | |
| 1105 | } while (status != PJ_EPENDING && status != PJ_ECANCELLED); |
| 1106 | |
| 1107 | /* Release allocation lock */ |
| 1108 | pj_lock_release(rel->allocation->lock); |
| 1109 | } |
| 1110 | |
| 1111 | /* |
| 1112 | * Callback notification from STUN session when it wants to send |
| 1113 | * a STUN message towards the client. |
| 1114 | */ |
| 1115 | static pj_status_t stun_on_send_msg(pj_stun_session *sess, |
| 1116 | void *token, |
| 1117 | const void *pkt, |
| 1118 | pj_size_t pkt_size, |
| 1119 | const pj_sockaddr_t *dst_addr, |
| 1120 | unsigned addr_len) |
| 1121 | { |
| 1122 | pj_turn_allocation *alloc; |
| 1123 | |
| 1124 | PJ_UNUSED_ARG(token); |
| 1125 | |
| 1126 | alloc = (pj_turn_allocation*) pj_stun_session_get_user_data(sess); |
| 1127 | |
| 1128 | return alloc->transport->sendto(alloc->transport, pkt, pkt_size, 0, |
| 1129 | dst_addr, addr_len); |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * Callback notification from STUN session when it receives STUN |
| 1134 | * requests. This callback was trigger by STUN incoming message |
| 1135 | * processing in pj_turn_allocation_on_rx_client_pkt(). |
| 1136 | */ |
| 1137 | static pj_status_t stun_on_rx_request(pj_stun_session *sess, |
| 1138 | const pj_uint8_t *pkt, |
| 1139 | unsigned pkt_len, |
| 1140 | const pj_stun_rx_data *rdata, |
| 1141 | void *token, |
| 1142 | const pj_sockaddr_t *src_addr, |
| 1143 | unsigned src_addr_len) |
| 1144 | { |
| 1145 | const pj_stun_msg *msg = rdata->msg; |
| 1146 | pj_turn_allocation *alloc; |
| 1147 | |
| 1148 | PJ_UNUSED_ARG(pkt); |
| 1149 | PJ_UNUSED_ARG(pkt_len); |
| 1150 | PJ_UNUSED_ARG(token); |
| 1151 | PJ_UNUSED_ARG(src_addr); |
| 1152 | PJ_UNUSED_ARG(src_addr_len); |
| 1153 | |
| 1154 | alloc = (pj_turn_allocation*) pj_stun_session_get_user_data(sess); |
| 1155 | |
| 1156 | /* Refuse to serve any request if we've been shutdown */ |
| 1157 | if (alloc->relay.lifetime == 0) { |
| 1158 | /* Reject with 437 if we're shutting down */ |
| 1159 | send_reply_err(alloc, rdata, PJ_TRUE, |
| 1160 | PJ_STUN_SC_ALLOCATION_MISMATCH, NULL); |
| 1161 | return PJ_SUCCESS; |
| 1162 | } |
| 1163 | |
| 1164 | if (msg->hdr.type == PJ_STUN_REFRESH_REQUEST) { |
| 1165 | /* |
| 1166 | * Handle REFRESH request |
| 1167 | */ |
| 1168 | pj_stun_lifetime_attr *lifetime; |
| 1169 | pj_stun_bandwidth_attr *bandwidth; |
| 1170 | |
| 1171 | /* Get LIFETIME attribute */ |
| 1172 | lifetime = (pj_stun_lifetime_attr*) |
| 1173 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_LIFETIME, 0); |
| 1174 | |
| 1175 | /* Get BANDWIDTH attribute */ |
| 1176 | bandwidth = (pj_stun_bandwidth_attr*) |
| 1177 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_BANDWIDTH, 0); |
| 1178 | |
| 1179 | if (lifetime && lifetime->value==0) { |
| 1180 | /* |
| 1181 | * This is deallocation request. |
| 1182 | */ |
| 1183 | alloc->relay.lifetime = 0; |
| 1184 | |
| 1185 | /* Respond first */ |
| 1186 | send_reply_ok(alloc, rdata); |
| 1187 | |
| 1188 | /* Shutdown allocation */ |
| 1189 | PJ_LOG(4,(alloc->obj_name, |
| 1190 | "Client %s request to dealloc, shutting down", |
| 1191 | alloc->info)); |
| 1192 | |
| 1193 | alloc_shutdown(alloc); |
| 1194 | |
| 1195 | } else { |
| 1196 | /* |
| 1197 | * This is a refresh request. |
| 1198 | */ |
| 1199 | |
| 1200 | /* Update lifetime */ |
| 1201 | if (lifetime) { |
| 1202 | alloc->relay.lifetime = lifetime->value; |
| 1203 | } |
| 1204 | |
| 1205 | /* Update bandwidth */ |
| 1206 | // TODO: |
| 1207 | |
| 1208 | /* Update expiration timer */ |
| 1209 | resched_timeout(alloc); |
| 1210 | |
| 1211 | /* Send reply */ |
| 1212 | send_reply_ok(alloc, rdata); |
| 1213 | } |
| 1214 | |
| 1215 | } else if (msg->hdr.type == PJ_STUN_CHANNEL_BIND_REQUEST) { |
| 1216 | /* |
| 1217 | * ChannelBind request. |
| 1218 | */ |
| 1219 | pj_stun_channel_number_attr *ch_attr; |
| 1220 | pj_stun_xor_peer_addr_attr *peer_attr; |
| 1221 | pj_turn_permission *p1, *p2; |
| 1222 | |
| 1223 | ch_attr = (pj_stun_channel_number_attr*) |
| 1224 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_CHANNEL_NUMBER, 0); |
| 1225 | peer_attr = (pj_stun_xor_peer_addr_attr*) |
| 1226 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_XOR_PEER_ADDR, 0); |
| 1227 | |
| 1228 | if (!ch_attr || !peer_attr) { |
| 1229 | send_reply_err(alloc, rdata, PJ_TRUE, |
| 1230 | PJ_STUN_SC_BAD_REQUEST, NULL); |
| 1231 | return PJ_SUCCESS; |
| 1232 | } |
| 1233 | |
| 1234 | /* Find permission with the channel number */ |
| 1235 | p1 = lookup_permission_by_chnum(alloc, PJ_STUN_GET_CH_NB(ch_attr->value)); |
| 1236 | |
| 1237 | /* If permission is found, this is supposed to be a channel bind |
| 1238 | * refresh. Make sure it's for the same peer. |
| 1239 | */ |
| 1240 | if (p1) { |
| 1241 | if (pj_sockaddr_cmp(&p1->hkey.peer_addr, &peer_attr->sockaddr)) { |
| 1242 | /* Address mismatch. Send 400 */ |
| 1243 | send_reply_err(alloc, rdata, PJ_TRUE, |
| 1244 | PJ_STUN_SC_BAD_REQUEST, |
| 1245 | "Peer address mismatch"); |
| 1246 | return PJ_SUCCESS; |
| 1247 | } |
| 1248 | |
| 1249 | /* Refresh permission */ |
| 1250 | refresh_permission(p1); |
| 1251 | |
| 1252 | /* Send response */ |
| 1253 | send_reply_ok(alloc, rdata); |
| 1254 | |
| 1255 | /* Done */ |
| 1256 | return PJ_SUCCESS; |
| 1257 | } |
| 1258 | |
| 1259 | /* If permission is not found, create a new one. Make sure the peer |
| 1260 | * has not alreadyy assigned with a channel number. |
| 1261 | */ |
| 1262 | p2 = lookup_permission_by_addr(alloc, &peer_attr->sockaddr, |
| 1263 | pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| 1264 | if (p2 && p2->channel != PJ_TURN_INVALID_CHANNEL) { |
| 1265 | send_reply_err(alloc, rdata, PJ_TRUE, PJ_STUN_SC_BAD_REQUEST, |
| 1266 | "Peer address already assigned a channel number"); |
| 1267 | return PJ_SUCCESS; |
| 1268 | } |
| 1269 | |
| 1270 | /* Create permission if it doesn't exist */ |
| 1271 | if (!p2) { |
| 1272 | p2 = create_permission(alloc, &peer_attr->sockaddr, |
| 1273 | pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| 1274 | if (!p2) |
| 1275 | return PJ_SUCCESS; |
| 1276 | } |
| 1277 | |
| 1278 | /* Assign channel number to permission */ |
| 1279 | p2->channel = PJ_STUN_GET_CH_NB(ch_attr->value); |
| 1280 | |
| 1281 | /* Register to hash table */ |
| 1282 | pj_assert(sizeof(p2->channel==2)); |
| 1283 | pj_hash_set(alloc->pool, alloc->ch_table, &p2->channel, |
| 1284 | sizeof(p2->channel), 0, p2); |
| 1285 | |
| 1286 | /* Update */ |
| 1287 | refresh_permission(p2); |
| 1288 | |
| 1289 | /* Reply */ |
| 1290 | send_reply_ok(alloc, rdata); |
| 1291 | |
| 1292 | return PJ_SUCCESS; |
| 1293 | |
| 1294 | } else if (msg->hdr.type == PJ_STUN_ALLOCATE_REQUEST) { |
| 1295 | |
| 1296 | /* Respond with 437 (section 6.3 turn-07) */ |
| 1297 | send_reply_err(alloc, rdata, PJ_TRUE, PJ_STUN_SC_ALLOCATION_MISMATCH, |
| 1298 | NULL); |
| 1299 | |
| 1300 | } else { |
| 1301 | |
| 1302 | /* Respond with Bad Request? */ |
| 1303 | send_reply_err(alloc, rdata, PJ_TRUE, PJ_STUN_SC_BAD_REQUEST, NULL); |
| 1304 | |
| 1305 | } |
| 1306 | |
| 1307 | return PJ_SUCCESS; |
| 1308 | } |
| 1309 | |
| 1310 | /* |
| 1311 | * Callback notification from STUN session when it receives STUN |
| 1312 | * indications. This callback was trigger by STUN incoming message |
| 1313 | * processing in pj_turn_allocation_on_rx_client_pkt(). |
| 1314 | */ |
| 1315 | static pj_status_t stun_on_rx_indication(pj_stun_session *sess, |
| 1316 | const pj_uint8_t *pkt, |
| 1317 | unsigned pkt_len, |
| 1318 | const pj_stun_msg *msg, |
| 1319 | void *token, |
| 1320 | const pj_sockaddr_t *src_addr, |
| 1321 | unsigned src_addr_len) |
| 1322 | { |
| 1323 | pj_stun_xor_peer_addr_attr *peer_attr; |
| 1324 | pj_stun_data_attr *data_attr; |
| 1325 | pj_turn_allocation *alloc; |
| 1326 | pj_turn_permission *perm; |
| 1327 | pj_ssize_t len; |
| 1328 | |
| 1329 | PJ_UNUSED_ARG(pkt); |
| 1330 | PJ_UNUSED_ARG(pkt_len); |
| 1331 | PJ_UNUSED_ARG(token); |
| 1332 | PJ_UNUSED_ARG(src_addr); |
| 1333 | PJ_UNUSED_ARG(src_addr_len); |
| 1334 | |
| 1335 | alloc = (pj_turn_allocation*) pj_stun_session_get_user_data(sess); |
| 1336 | |
| 1337 | /* Only expect Send Indication */ |
| 1338 | if (msg->hdr.type != PJ_STUN_SEND_INDICATION) { |
| 1339 | /* Ignore */ |
| 1340 | return PJ_SUCCESS; |
| 1341 | } |
| 1342 | |
| 1343 | /* Get XOR-PEER-ADDRESS attribute */ |
| 1344 | peer_attr = (pj_stun_xor_peer_addr_attr*) |
| 1345 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_XOR_PEER_ADDR, 0); |
| 1346 | |
| 1347 | /* MUST have XOR-PEER-ADDRESS attribute */ |
| 1348 | if (!peer_attr) |
| 1349 | return PJ_SUCCESS; |
| 1350 | |
| 1351 | /* Get DATA attribute */ |
| 1352 | data_attr = (pj_stun_data_attr*) |
| 1353 | pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_DATA, 0); |
| 1354 | |
| 1355 | /* Create/update/refresh the permission */ |
| 1356 | perm = lookup_permission_by_addr(alloc, &peer_attr->sockaddr, |
| 1357 | pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| 1358 | if (perm == NULL) { |
| 1359 | perm = create_permission(alloc, &peer_attr->sockaddr, |
| 1360 | pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| 1361 | } |
| 1362 | refresh_permission(perm); |
| 1363 | |
| 1364 | /* Return if we don't have data */ |
| 1365 | if (data_attr == NULL) |
| 1366 | return PJ_SUCCESS; |
| 1367 | |
| 1368 | /* Relay the data to peer */ |
| 1369 | len = data_attr->length; |
| 1370 | pj_sock_sendto(alloc->relay.tp.sock, data_attr->data, |
| 1371 | &len, 0, &peer_attr->sockaddr, |
| 1372 | pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| 1373 | |
| 1374 | return PJ_SUCCESS; |
| 1375 | } |
| 1376 | |
| 1377 | |