1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 #include "curl_setup.h" 24 25 #ifndef CURL_DISABLE_RTSP 26 27 #include "urldata.h" 28 #include <curl/curl.h> 29 #include "transfer.h" 30 #include "sendf.h" 31 #include "multiif.h" 32 #include "http.h" 33 #include "url.h" 34 #include "progress.h" 35 #include "rtsp.h" 36 #include "rawstr.h" 37 #include "select.h" 38 #include "connect.h" 39 #include "curl_printf.h" 40 41 /* The last #include files should be: */ 42 #include "curl_memory.h" 43 #include "memdebug.h" 44 45 /* 46 * TODO (general) 47 * -incoming server requests 48 * -server CSeq counter 49 * -digest authentication 50 * -connect thru proxy 51 * -pipelining? 52 */ 53 54 55 #define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1]))) 56 57 #define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) | \ 58 ((int)((unsigned char)((p)[3])))) 59 60 /* protocol-specific functions set up to be called by the main engine */ 61 static CURLcode rtsp_do(struct connectdata *conn, bool *done); 62 static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature); 63 static CURLcode rtsp_connect(struct connectdata *conn, bool *done); 64 static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead); 65 66 static int rtsp_getsock_do(struct connectdata *conn, 67 curl_socket_t *socks, 68 int numsocks); 69 70 /* 71 * Parse and write out any available RTP data. 72 * 73 * nread: amount of data left after k->str. will be modified if RTP 74 * data is parsed and k->str is moved up 75 * readmore: whether or not the RTP parser needs more data right away 76 */ 77 static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data, 78 struct connectdata *conn, 79 ssize_t *nread, 80 bool *readmore); 81 82 static CURLcode rtsp_setup_connection(struct connectdata *conn); 83 84 85 /* this returns the socket to wait for in the DO and DOING state for the multi 86 interface and then we're always _sending_ a request and thus we wait for 87 the single socket to become writable only */ 88 static int rtsp_getsock_do(struct connectdata *conn, 89 curl_socket_t *socks, 90 int numsocks) 91 { 92 /* write mode */ 93 (void)numsocks; /* unused, we trust it to be at least 1 */ 94 socks[0] = conn->sock[FIRSTSOCKET]; 95 return GETSOCK_WRITESOCK(0); 96 } 97 98 static 99 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len); 100 101 102 /* 103 * RTSP handler interface. 104 */ 105 const struct Curl_handler Curl_handler_rtsp = { 106 "RTSP", /* scheme */ 107 rtsp_setup_connection, /* setup_connection */ 108 rtsp_do, /* do_it */ 109 rtsp_done, /* done */ 110 ZERO_NULL, /* do_more */ 111 rtsp_connect, /* connect_it */ 112 ZERO_NULL, /* connecting */ 113 ZERO_NULL, /* doing */ 114 ZERO_NULL, /* proto_getsock */ 115 rtsp_getsock_do, /* doing_getsock */ 116 ZERO_NULL, /* domore_getsock */ 117 ZERO_NULL, /* perform_getsock */ 118 rtsp_disconnect, /* disconnect */ 119 rtsp_rtp_readwrite, /* readwrite */ 120 PORT_RTSP, /* defport */ 121 CURLPROTO_RTSP, /* protocol */ 122 PROTOPT_NONE /* flags */ 123 }; 124 125 126 static CURLcode rtsp_setup_connection(struct connectdata *conn) 127 { 128 struct RTSP *rtsp; 129 130 conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP)); 131 if(!rtsp) 132 return CURLE_OUT_OF_MEMORY; 133 134 return CURLE_OK; 135 } 136 137 138 /* 139 * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not 140 * want to block the application forever while receiving a stream. Therefore, 141 * we cannot assume that an RTSP socket is dead just because it is readable. 142 * 143 * Instead, if it is readable, run Curl_getconnectinfo() to peek at the socket 144 * and distinguish between closed and data. 145 */ 146 bool Curl_rtsp_connisdead(struct connectdata *check) 147 { 148 int sval; 149 bool ret_val = TRUE; 150 151 sval = Curl_socket_ready(check->sock[FIRSTSOCKET], CURL_SOCKET_BAD, 0); 152 if(sval == 0) { 153 /* timeout */ 154 ret_val = FALSE; 155 } 156 else if(sval & CURL_CSELECT_ERR) { 157 /* socket is in an error state */ 158 ret_val = TRUE; 159 } 160 else if((sval & CURL_CSELECT_IN) && check->data) { 161 /* readable with no error. could be closed or could be alive but we can 162 only check if we have a proper SessionHandle for the connection */ 163 curl_socket_t connectinfo = Curl_getconnectinfo(check->data, &check); 164 if(connectinfo != CURL_SOCKET_BAD) 165 ret_val = FALSE; 166 } 167 168 return ret_val; 169 } 170 171 static CURLcode rtsp_connect(struct connectdata *conn, bool *done) 172 { 173 CURLcode httpStatus; 174 struct SessionHandle *data = conn->data; 175 176 httpStatus = Curl_http_connect(conn, done); 177 178 /* Initialize the CSeq if not already done */ 179 if(data->state.rtsp_next_client_CSeq == 0) 180 data->state.rtsp_next_client_CSeq = 1; 181 if(data->state.rtsp_next_server_CSeq == 0) 182 data->state.rtsp_next_server_CSeq = 1; 183 184 conn->proto.rtspc.rtp_channel = -1; 185 186 return httpStatus; 187 } 188 189 static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead) 190 { 191 (void) dead; 192 Curl_safefree(conn->proto.rtspc.rtp_buf); 193 return CURLE_OK; 194 } 195 196 197 static CURLcode rtsp_done(struct connectdata *conn, 198 CURLcode status, bool premature) 199 { 200 struct SessionHandle *data = conn->data; 201 struct RTSP *rtsp = data->req.protop; 202 CURLcode httpStatus; 203 long CSeq_sent; 204 long CSeq_recv; 205 206 /* Bypass HTTP empty-reply checks on receive */ 207 if(data->set.rtspreq == RTSPREQ_RECEIVE) 208 premature = TRUE; 209 210 httpStatus = Curl_http_done(conn, status, premature); 211 212 if(rtsp) { 213 /* Check the sequence numbers */ 214 CSeq_sent = rtsp->CSeq_sent; 215 CSeq_recv = rtsp->CSeq_recv; 216 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) { 217 failf(data, 218 "The CSeq of this request %ld did not match the response %ld", 219 CSeq_sent, CSeq_recv); 220 return CURLE_RTSP_CSEQ_ERROR; 221 } 222 else if(data->set.rtspreq == RTSPREQ_RECEIVE && 223 (conn->proto.rtspc.rtp_channel == -1)) { 224 infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv); 225 /* TODO CPC: Server -> Client logic here */ 226 } 227 } 228 229 return httpStatus; 230 } 231 232 static CURLcode rtsp_do(struct connectdata *conn, bool *done) 233 { 234 struct SessionHandle *data = conn->data; 235 CURLcode result=CURLE_OK; 236 Curl_RtspReq rtspreq = data->set.rtspreq; 237 struct RTSP *rtsp = data->req.protop; 238 struct HTTP *http; 239 Curl_send_buffer *req_buffer; 240 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */ 241 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */ 242 243 const char *p_request = NULL; 244 const char *p_session_id = NULL; 245 const char *p_accept = NULL; 246 const char *p_accept_encoding = NULL; 247 const char *p_range = NULL; 248 const char *p_referrer = NULL; 249 const char *p_stream_uri = NULL; 250 const char *p_transport = NULL; 251 const char *p_uagent = NULL; 252 253 *done = TRUE; 254 255 http = &(rtsp->http_wrapper); 256 /* Assert that no one has changed the RTSP struct in an evil way */ 257 DEBUGASSERT((void *)http == (void *)rtsp); 258 259 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq; 260 rtsp->CSeq_recv = 0; 261 262 /* Setup the 'p_request' pointer to the proper p_request string 263 * Since all RTSP requests are included here, there is no need to 264 * support custom requests like HTTP. 265 **/ 266 data->set.opt_no_body = TRUE; /* most requests don't contain a body */ 267 switch(rtspreq) { 268 default: 269 failf(data, "Got invalid RTSP request"); 270 return CURLE_BAD_FUNCTION_ARGUMENT; 271 case RTSPREQ_OPTIONS: 272 p_request = "OPTIONS"; 273 break; 274 case RTSPREQ_DESCRIBE: 275 p_request = "DESCRIBE"; 276 data->set.opt_no_body = FALSE; 277 break; 278 case RTSPREQ_ANNOUNCE: 279 p_request = "ANNOUNCE"; 280 break; 281 case RTSPREQ_SETUP: 282 p_request = "SETUP"; 283 break; 284 case RTSPREQ_PLAY: 285 p_request = "PLAY"; 286 break; 287 case RTSPREQ_PAUSE: 288 p_request = "PAUSE"; 289 break; 290 case RTSPREQ_TEARDOWN: 291 p_request = "TEARDOWN"; 292 break; 293 case RTSPREQ_GET_PARAMETER: 294 /* GET_PARAMETER's no_body status is determined later */ 295 p_request = "GET_PARAMETER"; 296 data->set.opt_no_body = FALSE; 297 break; 298 case RTSPREQ_SET_PARAMETER: 299 p_request = "SET_PARAMETER"; 300 break; 301 case RTSPREQ_RECORD: 302 p_request = "RECORD"; 303 break; 304 case RTSPREQ_RECEIVE: 305 p_request = ""; 306 /* Treat interleaved RTP as body*/ 307 data->set.opt_no_body = FALSE; 308 break; 309 case RTSPREQ_LAST: 310 failf(data, "Got invalid RTSP request: RTSPREQ_LAST"); 311 return CURLE_BAD_FUNCTION_ARGUMENT; 312 } 313 314 if(rtspreq == RTSPREQ_RECEIVE) { 315 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, 316 &http->readbytecount, -1, NULL); 317 318 return result; 319 } 320 321 p_session_id = data->set.str[STRING_RTSP_SESSION_ID]; 322 if(!p_session_id && 323 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) { 324 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.", 325 p_request); 326 return CURLE_BAD_FUNCTION_ARGUMENT; 327 } 328 329 /* TODO: auth? */ 330 /* TODO: proxy? */ 331 332 /* Stream URI. Default to server '*' if not specified */ 333 if(data->set.str[STRING_RTSP_STREAM_URI]) { 334 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI]; 335 } 336 else { 337 p_stream_uri = "*"; 338 } 339 340 /* Transport Header for SETUP requests */ 341 p_transport = Curl_checkheaders(conn, "Transport:"); 342 if(rtspreq == RTSPREQ_SETUP && !p_transport) { 343 /* New Transport: setting? */ 344 if(data->set.str[STRING_RTSP_TRANSPORT]) { 345 Curl_safefree(conn->allocptr.rtsp_transport); 346 347 conn->allocptr.rtsp_transport = 348 aprintf("Transport: %s\r\n", 349 data->set.str[STRING_RTSP_TRANSPORT]); 350 if(!conn->allocptr.rtsp_transport) 351 return CURLE_OUT_OF_MEMORY; 352 } 353 else { 354 failf(data, 355 "Refusing to issue an RTSP SETUP without a Transport: header."); 356 return CURLE_BAD_FUNCTION_ARGUMENT; 357 } 358 359 p_transport = conn->allocptr.rtsp_transport; 360 } 361 362 /* Accept Headers for DESCRIBE requests */ 363 if(rtspreq == RTSPREQ_DESCRIBE) { 364 /* Accept Header */ 365 p_accept = Curl_checkheaders(conn, "Accept:")? 366 NULL:"Accept: application/sdp\r\n"; 367 368 /* Accept-Encoding header */ 369 if(!Curl_checkheaders(conn, "Accept-Encoding:") && 370 data->set.str[STRING_ENCODING]) { 371 Curl_safefree(conn->allocptr.accept_encoding); 372 conn->allocptr.accept_encoding = 373 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]); 374 375 if(!conn->allocptr.accept_encoding) 376 return CURLE_OUT_OF_MEMORY; 377 378 p_accept_encoding = conn->allocptr.accept_encoding; 379 } 380 } 381 382 /* The User-Agent string might have been allocated in url.c already, because 383 it might have been used in the proxy connect, but if we have got a header 384 with the user-agent string specified, we erase the previously made string 385 here. */ 386 if(Curl_checkheaders(conn, "User-Agent:") && conn->allocptr.uagent) { 387 Curl_safefree(conn->allocptr.uagent); 388 conn->allocptr.uagent = NULL; 389 } 390 else if(!Curl_checkheaders(conn, "User-Agent:") && 391 data->set.str[STRING_USERAGENT]) { 392 p_uagent = conn->allocptr.uagent; 393 } 394 395 /* Referrer */ 396 Curl_safefree(conn->allocptr.ref); 397 if(data->change.referer && !Curl_checkheaders(conn, "Referer:")) 398 conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer); 399 else 400 conn->allocptr.ref = NULL; 401 402 p_referrer = conn->allocptr.ref; 403 404 /* 405 * Range Header 406 * Only applies to PLAY, PAUSE, RECORD 407 * 408 * Go ahead and use the Range stuff supplied for HTTP 409 */ 410 if(data->state.use_range && 411 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) { 412 413 /* Check to see if there is a range set in the custom headers */ 414 if(!Curl_checkheaders(conn, "Range:") && data->state.range) { 415 Curl_safefree(conn->allocptr.rangeline); 416 conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range); 417 p_range = conn->allocptr.rangeline; 418 } 419 } 420 421 /* 422 * Sanity check the custom headers 423 */ 424 if(Curl_checkheaders(conn, "CSeq:")) { 425 failf(data, "CSeq cannot be set as a custom header."); 426 return CURLE_RTSP_CSEQ_ERROR; 427 } 428 if(Curl_checkheaders(conn, "Session:")) { 429 failf(data, "Session ID cannot be set as a custom header."); 430 return CURLE_BAD_FUNCTION_ARGUMENT; 431 } 432 433 /* Initialize a dynamic send buffer */ 434 req_buffer = Curl_add_buffer_init(); 435 436 if(!req_buffer) 437 return CURLE_OUT_OF_MEMORY; 438 439 result = 440 Curl_add_bufferf(req_buffer, 441 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */ 442 "CSeq: %ld\r\n", /* CSeq */ 443 (p_request ? p_request : ""), p_stream_uri, 444 rtsp->CSeq_sent); 445 if(result) 446 return result; 447 448 /* 449 * Rather than do a normal alloc line, keep the session_id unformatted 450 * to make comparison easier 451 */ 452 if(p_session_id) { 453 result = Curl_add_bufferf(req_buffer, "Session: %s\r\n", p_session_id); 454 if(result) 455 return result; 456 } 457 458 /* 459 * Shared HTTP-like options 460 */ 461 result = Curl_add_bufferf(req_buffer, 462 "%s" /* transport */ 463 "%s" /* accept */ 464 "%s" /* accept-encoding */ 465 "%s" /* range */ 466 "%s" /* referrer */ 467 "%s" /* user-agent */ 468 , 469 p_transport ? p_transport : "", 470 p_accept ? p_accept : "", 471 p_accept_encoding ? p_accept_encoding : "", 472 p_range ? p_range : "", 473 p_referrer ? p_referrer : "", 474 p_uagent ? p_uagent : ""); 475 if(result) 476 return result; 477 478 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) { 479 result = Curl_add_timecondition(data, req_buffer); 480 if(result) 481 return result; 482 } 483 484 result = Curl_add_custom_headers(conn, FALSE, req_buffer); 485 if(result) 486 return result; 487 488 if(rtspreq == RTSPREQ_ANNOUNCE || 489 rtspreq == RTSPREQ_SET_PARAMETER || 490 rtspreq == RTSPREQ_GET_PARAMETER) { 491 492 if(data->set.upload) { 493 putsize = data->state.infilesize; 494 data->set.httpreq = HTTPREQ_PUT; 495 496 } 497 else { 498 postsize = (data->state.infilesize != -1)? 499 data->state.infilesize: 500 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0); 501 data->set.httpreq = HTTPREQ_POST; 502 } 503 504 if(putsize > 0 || postsize > 0) { 505 /* As stated in the http comments, it is probably not wise to 506 * actually set a custom Content-Length in the headers */ 507 if(!Curl_checkheaders(conn, "Content-Length:")) { 508 result = Curl_add_bufferf(req_buffer, 509 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n", 510 (data->set.upload ? putsize : postsize)); 511 if(result) 512 return result; 513 } 514 515 if(rtspreq == RTSPREQ_SET_PARAMETER || 516 rtspreq == RTSPREQ_GET_PARAMETER) { 517 if(!Curl_checkheaders(conn, "Content-Type:")) { 518 result = Curl_add_bufferf(req_buffer, 519 "Content-Type: text/parameters\r\n"); 520 if(result) 521 return result; 522 } 523 } 524 525 if(rtspreq == RTSPREQ_ANNOUNCE) { 526 if(!Curl_checkheaders(conn, "Content-Type:")) { 527 result = Curl_add_bufferf(req_buffer, 528 "Content-Type: application/sdp\r\n"); 529 if(result) 530 return result; 531 } 532 } 533 534 data->state.expect100header = FALSE; /* RTSP posts are simple/small */ 535 } 536 else if(rtspreq == RTSPREQ_GET_PARAMETER) { 537 /* Check for an empty GET_PARAMETER (heartbeat) request */ 538 data->set.httpreq = HTTPREQ_HEAD; 539 data->set.opt_no_body = TRUE; 540 } 541 } 542 543 /* RTSP never allows chunked transfer */ 544 data->req.forbidchunk = TRUE; 545 /* Finish the request buffer */ 546 result = Curl_add_buffer(req_buffer, "\r\n", 2); 547 if(result) 548 return result; 549 550 if(postsize > 0) { 551 result = Curl_add_buffer(req_buffer, data->set.postfields, 552 (size_t)postsize); 553 if(result) 554 return result; 555 } 556 557 /* issue the request */ 558 result = Curl_add_buffer_send(req_buffer, conn, 559 &data->info.request_size, 0, FIRSTSOCKET); 560 if(result) { 561 failf(data, "Failed sending RTSP request"); 562 return result; 563 } 564 565 Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount, 566 putsize?FIRSTSOCKET:-1, 567 putsize?&http->writebytecount:NULL); 568 569 /* Increment the CSeq on success */ 570 data->state.rtsp_next_client_CSeq++; 571 572 if(http->writebytecount) { 573 /* if a request-body has been sent off, we make sure this progress is 574 noted properly */ 575 Curl_pgrsSetUploadCounter(data, http->writebytecount); 576 if(Curl_pgrsUpdate(conn)) 577 result = CURLE_ABORTED_BY_CALLBACK; 578 } 579 580 return result; 581 } 582 583 584 static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data, 585 struct connectdata *conn, 586 ssize_t *nread, 587 bool *readmore) { 588 struct SingleRequest *k = &data->req; 589 struct rtsp_conn *rtspc = &(conn->proto.rtspc); 590 591 char *rtp; /* moving pointer to rtp data */ 592 ssize_t rtp_dataleft; /* how much data left to parse in this round */ 593 char *scratch; 594 CURLcode result; 595 596 if(rtspc->rtp_buf) { 597 /* There was some leftover data the last time. Merge buffers */ 598 char *newptr = realloc(rtspc->rtp_buf, rtspc->rtp_bufsize + *nread); 599 if(!newptr) { 600 Curl_safefree(rtspc->rtp_buf); 601 rtspc->rtp_buf = NULL; 602 rtspc->rtp_bufsize = 0; 603 return CURLE_OUT_OF_MEMORY; 604 } 605 rtspc->rtp_buf = newptr; 606 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread); 607 rtspc->rtp_bufsize += *nread; 608 rtp = rtspc->rtp_buf; 609 rtp_dataleft = rtspc->rtp_bufsize; 610 } 611 else { 612 /* Just parse the request buffer directly */ 613 rtp = k->str; 614 rtp_dataleft = *nread; 615 } 616 617 while((rtp_dataleft > 0) && 618 (rtp[0] == '$')) { 619 if(rtp_dataleft > 4) { 620 int rtp_length; 621 622 /* Parse the header */ 623 /* The channel identifier immediately follows and is 1 byte */ 624 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp); 625 626 /* The length is two bytes */ 627 rtp_length = RTP_PKT_LENGTH(rtp); 628 629 if(rtp_dataleft < rtp_length + 4) { 630 /* Need more - incomplete payload*/ 631 *readmore = TRUE; 632 break; 633 } 634 else { 635 /* We have the full RTP interleaved packet 636 * Write out the header including the leading '$' */ 637 DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n", 638 rtspc->rtp_channel, rtp_length)); 639 result = rtp_client_write(conn, &rtp[0], rtp_length + 4); 640 if(result) { 641 failf(data, "Got an error writing an RTP packet"); 642 *readmore = FALSE; 643 Curl_safefree(rtspc->rtp_buf); 644 rtspc->rtp_buf = NULL; 645 rtspc->rtp_bufsize = 0; 646 return result; 647 } 648 649 /* Move forward in the buffer */ 650 rtp_dataleft -= rtp_length + 4; 651 rtp += rtp_length + 4; 652 653 if(data->set.rtspreq == RTSPREQ_RECEIVE) { 654 /* If we are in a passive receive, give control back 655 * to the app as often as we can. 656 */ 657 k->keepon &= ~KEEP_RECV; 658 } 659 } 660 } 661 else { 662 /* Need more - incomplete header */ 663 *readmore = TRUE; 664 break; 665 } 666 } 667 668 if(rtp_dataleft != 0 && rtp[0] == '$') { 669 DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft, 670 *readmore ? "(READMORE)" : "")); 671 672 /* Store the incomplete RTP packet for a "rewind" */ 673 scratch = malloc(rtp_dataleft); 674 if(!scratch) { 675 Curl_safefree(rtspc->rtp_buf); 676 rtspc->rtp_buf = NULL; 677 rtspc->rtp_bufsize = 0; 678 return CURLE_OUT_OF_MEMORY; 679 } 680 memcpy(scratch, rtp, rtp_dataleft); 681 Curl_safefree(rtspc->rtp_buf); 682 rtspc->rtp_buf = scratch; 683 rtspc->rtp_bufsize = rtp_dataleft; 684 685 /* As far as the transfer is concerned, this data is consumed */ 686 *nread = 0; 687 return CURLE_OK; 688 } 689 else { 690 /* Fix up k->str to point just after the last RTP packet */ 691 k->str += *nread - rtp_dataleft; 692 693 /* either all of the data has been read or... 694 * rtp now points at the next byte to parse 695 */ 696 if(rtp_dataleft > 0) 697 DEBUGASSERT(k->str[0] == rtp[0]); 698 699 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */ 700 701 *nread = rtp_dataleft; 702 } 703 704 /* If we get here, we have finished with the leftover/merge buffer */ 705 Curl_safefree(rtspc->rtp_buf); 706 rtspc->rtp_buf = NULL; 707 rtspc->rtp_bufsize = 0; 708 709 return CURLE_OK; 710 } 711 712 static 713 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len) 714 { 715 struct SessionHandle *data = conn->data; 716 size_t wrote; 717 curl_write_callback writeit; 718 719 if(len == 0) { 720 failf (data, "Cannot write a 0 size RTP packet."); 721 return CURLE_WRITE_ERROR; 722 } 723 724 writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func; 725 wrote = writeit(ptr, 1, len, data->set.rtp_out); 726 727 if(CURL_WRITEFUNC_PAUSE == wrote) { 728 failf (data, "Cannot pause RTP"); 729 return CURLE_WRITE_ERROR; 730 } 731 732 if(wrote != len) { 733 failf (data, "Failed writing RTP data"); 734 return CURLE_WRITE_ERROR; 735 } 736 737 return CURLE_OK; 738 } 739 740 CURLcode Curl_rtsp_parseheader(struct connectdata *conn, 741 char *header) 742 { 743 struct SessionHandle *data = conn->data; 744 long CSeq = 0; 745 746 if(checkprefix("CSeq:", header)) { 747 /* Store the received CSeq. Match is verified in rtsp_done */ 748 int nc = sscanf(&header[4], ": %ld", &CSeq); 749 if(nc == 1) { 750 struct RTSP *rtsp = data->req.protop; 751 rtsp->CSeq_recv = CSeq; /* mark the request */ 752 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */ 753 } 754 else { 755 failf(data, "Unable to read the CSeq header: [%s]", header); 756 return CURLE_RTSP_CSEQ_ERROR; 757 } 758 } 759 else if(checkprefix("Session:", header)) { 760 char *start; 761 762 /* Find the first non-space letter */ 763 start = header + 8; 764 while(*start && ISSPACE(*start)) 765 start++; 766 767 if(!*start) { 768 failf(data, "Got a blank Session ID"); 769 } 770 else if(data->set.str[STRING_RTSP_SESSION_ID]) { 771 /* If the Session ID is set, then compare */ 772 if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], 773 strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) { 774 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]", 775 start, data->set.str[STRING_RTSP_SESSION_ID]); 776 return CURLE_RTSP_SESSION_ERROR; 777 } 778 } 779 else { 780 /* If the Session ID is not set, and we find it in a response, then 781 set it */ 782 783 /* The session ID can be an alphanumeric or a 'safe' character 784 * 785 * RFC 2326 15.1 Base Syntax: 786 * safe = "\$" | "-" | "_" | "." | "+" 787 * */ 788 char *end = start; 789 while(*end && 790 (ISALNUM(*end) || *end == '-' || *end == '_' || *end == '.' || 791 *end == '+' || 792 (*end == '\\' && *(end + 1) && *(end + 1) == '$' && (++end, 1)))) 793 end++; 794 795 /* Copy the id substring into a new buffer */ 796 data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1); 797 if(data->set.str[STRING_RTSP_SESSION_ID] == NULL) 798 return CURLE_OUT_OF_MEMORY; 799 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start); 800 (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0'; 801 } 802 } 803 return CURLE_OK; 804 } 805 806 #endif /* CURL_DISABLE_RTSP */ 807
