1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@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 https://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 "strcase.h"
37 #include "select.h"
38 #include "connect.h"
39 #include "strdup.h"
40 /* The last 3 #include files should be in this order */
41 #include "curl_printf.h"
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 through 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 Curl_easy *data,
78 struct connectdata *conn,
79 ssize_t *nread,
80 bool *readmore);
81
82 static CURLcode rtsp_setup_connection(struct connectdata *conn);
83 static unsigned int rtsp_conncheck(struct connectdata *check,
84 unsigned int checks_to_perform);
85
86 /* this returns the socket to wait for in the DO and DOING state for the multi
87 interface and then we're always _sending_ a request and thus we wait for
88 the single socket to become writable only */
rtsp_getsock_do(struct connectdata * conn,curl_socket_t * socks,int numsocks)89 static int rtsp_getsock_do(struct connectdata *conn,
90 curl_socket_t *socks,
91 int numsocks)
92 {
93 /* write mode */
94 (void)numsocks; /* unused, we trust it to be at least 1 */
95 socks[0] = conn->sock[FIRSTSOCKET];
96 return GETSOCK_WRITESOCK(0);
97 }
98
99 static
100 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len);
101
102
103 /*
104 * RTSP handler interface.
105 */
106 const struct Curl_handler Curl_handler_rtsp = {
107 "RTSP", /* scheme */
108 rtsp_setup_connection, /* setup_connection */
109 rtsp_do, /* do_it */
110 rtsp_done, /* done */
111 ZERO_NULL, /* do_more */
112 rtsp_connect, /* connect_it */
113 ZERO_NULL, /* connecting */
114 ZERO_NULL, /* doing */
115 ZERO_NULL, /* proto_getsock */
116 rtsp_getsock_do, /* doing_getsock */
117 ZERO_NULL, /* domore_getsock */
118 ZERO_NULL, /* perform_getsock */
119 rtsp_disconnect, /* disconnect */
120 rtsp_rtp_readwrite, /* readwrite */
121 rtsp_conncheck, /* connection_check */
122 PORT_RTSP, /* defport */
123 CURLPROTO_RTSP, /* protocol */
124 PROTOPT_NONE /* flags */
125 };
126
127
rtsp_setup_connection(struct connectdata * conn)128 static CURLcode rtsp_setup_connection(struct connectdata *conn)
129 {
130 struct RTSP *rtsp;
131
132 conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP));
133 if(!rtsp)
134 return CURLE_OUT_OF_MEMORY;
135
136 return CURLE_OK;
137 }
138
139
140 /*
141 * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
142 * want to block the application forever while receiving a stream. Therefore,
143 * we cannot assume that an RTSP socket is dead just because it is readable.
144 *
145 * Instead, if it is readable, run Curl_connalive() to peek at the socket
146 * and distinguish between closed and data.
147 */
rtsp_connisdead(struct connectdata * check)148 static bool rtsp_connisdead(struct connectdata *check)
149 {
150 int sval;
151 bool ret_val = TRUE;
152
153 sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
154 if(sval == 0) {
155 /* timeout */
156 ret_val = FALSE;
157 }
158 else if(sval & CURL_CSELECT_ERR) {
159 /* socket is in an error state */
160 ret_val = TRUE;
161 }
162 else if(sval & CURL_CSELECT_IN) {
163 /* readable with no error. could still be closed */
164 ret_val = !Curl_connalive(check);
165 }
166
167 return ret_val;
168 }
169
170 /*
171 * Function to check on various aspects of a connection.
172 */
rtsp_conncheck(struct connectdata * check,unsigned int checks_to_perform)173 static unsigned int rtsp_conncheck(struct connectdata *check,
174 unsigned int checks_to_perform)
175 {
176 unsigned int ret_val = CONNRESULT_NONE;
177
178 if(checks_to_perform & CONNCHECK_ISDEAD) {
179 if(rtsp_connisdead(check))
180 ret_val |= CONNRESULT_DEAD;
181 }
182
183 return ret_val;
184 }
185
186
rtsp_connect(struct connectdata * conn,bool * done)187 static CURLcode rtsp_connect(struct connectdata *conn, bool *done)
188 {
189 CURLcode httpStatus;
190 struct Curl_easy *data = conn->data;
191
192 httpStatus = Curl_http_connect(conn, done);
193
194 /* Initialize the CSeq if not already done */
195 if(data->state.rtsp_next_client_CSeq == 0)
196 data->state.rtsp_next_client_CSeq = 1;
197 if(data->state.rtsp_next_server_CSeq == 0)
198 data->state.rtsp_next_server_CSeq = 1;
199
200 conn->proto.rtspc.rtp_channel = -1;
201
202 return httpStatus;
203 }
204
rtsp_disconnect(struct connectdata * conn,bool dead)205 static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead)
206 {
207 (void) dead;
208 Curl_safefree(conn->proto.rtspc.rtp_buf);
209 return CURLE_OK;
210 }
211
212
rtsp_done(struct connectdata * conn,CURLcode status,bool premature)213 static CURLcode rtsp_done(struct connectdata *conn,
214 CURLcode status, bool premature)
215 {
216 struct Curl_easy *data = conn->data;
217 struct RTSP *rtsp = data->req.protop;
218 CURLcode httpStatus;
219
220 /* Bypass HTTP empty-reply checks on receive */
221 if(data->set.rtspreq == RTSPREQ_RECEIVE)
222 premature = TRUE;
223
224 httpStatus = Curl_http_done(conn, status, premature);
225
226 if(rtsp) {
227 /* Check the sequence numbers */
228 long CSeq_sent = rtsp->CSeq_sent;
229 long CSeq_recv = rtsp->CSeq_recv;
230 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
231 failf(data,
232 "The CSeq of this request %ld did not match the response %ld",
233 CSeq_sent, CSeq_recv);
234 return CURLE_RTSP_CSEQ_ERROR;
235 }
236 if(data->set.rtspreq == RTSPREQ_RECEIVE &&
237 (conn->proto.rtspc.rtp_channel == -1)) {
238 infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv);
239 /* TODO CPC: Server -> Client logic here */
240 }
241 }
242
243 return httpStatus;
244 }
245
rtsp_do(struct connectdata * conn,bool * done)246 static CURLcode rtsp_do(struct connectdata *conn, bool *done)
247 {
248 struct Curl_easy *data = conn->data;
249 CURLcode result = CURLE_OK;
250 Curl_RtspReq rtspreq = data->set.rtspreq;
251 struct RTSP *rtsp = data->req.protop;
252 Curl_send_buffer *req_buffer;
253 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
254 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
255
256 const char *p_request = NULL;
257 const char *p_session_id = NULL;
258 const char *p_accept = NULL;
259 const char *p_accept_encoding = NULL;
260 const char *p_range = NULL;
261 const char *p_referrer = NULL;
262 const char *p_stream_uri = NULL;
263 const char *p_transport = NULL;
264 const char *p_uagent = NULL;
265 const char *p_proxyuserpwd = NULL;
266 const char *p_userpwd = NULL;
267
268 *done = TRUE;
269
270 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
271 rtsp->CSeq_recv = 0;
272
273 /* Setup the 'p_request' pointer to the proper p_request string
274 * Since all RTSP requests are included here, there is no need to
275 * support custom requests like HTTP.
276 **/
277 data->set.opt_no_body = TRUE; /* most requests don't contain a body */
278 switch(rtspreq) {
279 default:
280 failf(data, "Got invalid RTSP request");
281 return CURLE_BAD_FUNCTION_ARGUMENT;
282 case RTSPREQ_OPTIONS:
283 p_request = "OPTIONS";
284 break;
285 case RTSPREQ_DESCRIBE:
286 p_request = "DESCRIBE";
287 data->set.opt_no_body = FALSE;
288 break;
289 case RTSPREQ_ANNOUNCE:
290 p_request = "ANNOUNCE";
291 break;
292 case RTSPREQ_SETUP:
293 p_request = "SETUP";
294 break;
295 case RTSPREQ_PLAY:
296 p_request = "PLAY";
297 break;
298 case RTSPREQ_PAUSE:
299 p_request = "PAUSE";
300 break;
301 case RTSPREQ_TEARDOWN:
302 p_request = "TEARDOWN";
303 break;
304 case RTSPREQ_GET_PARAMETER:
305 /* GET_PARAMETER's no_body status is determined later */
306 p_request = "GET_PARAMETER";
307 data->set.opt_no_body = FALSE;
308 break;
309 case RTSPREQ_SET_PARAMETER:
310 p_request = "SET_PARAMETER";
311 break;
312 case RTSPREQ_RECORD:
313 p_request = "RECORD";
314 break;
315 case RTSPREQ_RECEIVE:
316 p_request = "";
317 /* Treat interleaved RTP as body*/
318 data->set.opt_no_body = FALSE;
319 break;
320 case RTSPREQ_LAST:
321 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
322 return CURLE_BAD_FUNCTION_ARGUMENT;
323 }
324
325 if(rtspreq == RTSPREQ_RECEIVE) {
326 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
327
328 return result;
329 }
330
331 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
332 if(!p_session_id &&
333 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
334 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
335 p_request);
336 return CURLE_BAD_FUNCTION_ARGUMENT;
337 }
338
339 /* TODO: proxy? */
340
341 /* Stream URI. Default to server '*' if not specified */
342 if(data->set.str[STRING_RTSP_STREAM_URI]) {
343 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
344 }
345 else {
346 p_stream_uri = "*";
347 }
348
349 /* Transport Header for SETUP requests */
350 p_transport = Curl_checkheaders(conn, "Transport");
351 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
352 /* New Transport: setting? */
353 if(data->set.str[STRING_RTSP_TRANSPORT]) {
354 Curl_safefree(conn->allocptr.rtsp_transport);
355
356 conn->allocptr.rtsp_transport =
357 aprintf("Transport: %s\r\n",
358 data->set.str[STRING_RTSP_TRANSPORT]);
359 if(!conn->allocptr.rtsp_transport)
360 return CURLE_OUT_OF_MEMORY;
361 }
362 else {
363 failf(data,
364 "Refusing to issue an RTSP SETUP without a Transport: header.");
365 return CURLE_BAD_FUNCTION_ARGUMENT;
366 }
367
368 p_transport = conn->allocptr.rtsp_transport;
369 }
370
371 /* Accept Headers for DESCRIBE requests */
372 if(rtspreq == RTSPREQ_DESCRIBE) {
373 /* Accept Header */
374 p_accept = Curl_checkheaders(conn, "Accept")?
375 NULL:"Accept: application/sdp\r\n";
376
377 /* Accept-Encoding header */
378 if(!Curl_checkheaders(conn, "Accept-Encoding") &&
379 data->set.str[STRING_ENCODING]) {
380 Curl_safefree(conn->allocptr.accept_encoding);
381 conn->allocptr.accept_encoding =
382 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
383
384 if(!conn->allocptr.accept_encoding)
385 return CURLE_OUT_OF_MEMORY;
386
387 p_accept_encoding = conn->allocptr.accept_encoding;
388 }
389 }
390
391 /* The User-Agent string might have been allocated in url.c already, because
392 it might have been used in the proxy connect, but if we have got a header
393 with the user-agent string specified, we erase the previously made string
394 here. */
395 if(Curl_checkheaders(conn, "User-Agent") && conn->allocptr.uagent) {
396 Curl_safefree(conn->allocptr.uagent);
397 conn->allocptr.uagent = NULL;
398 }
399 else if(!Curl_checkheaders(conn, "User-Agent") &&
400 data->set.str[STRING_USERAGENT]) {
401 p_uagent = conn->allocptr.uagent;
402 }
403
404 /* setup the authentication headers */
405 result = Curl_http_output_auth(conn, p_request, p_stream_uri, FALSE);
406 if(result)
407 return result;
408
409 p_proxyuserpwd = conn->allocptr.proxyuserpwd;
410 p_userpwd = conn->allocptr.userpwd;
411
412 /* Referrer */
413 Curl_safefree(conn->allocptr.ref);
414 if(data->change.referer && !Curl_checkheaders(conn, "Referer"))
415 conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
416 else
417 conn->allocptr.ref = NULL;
418
419 p_referrer = conn->allocptr.ref;
420
421 /*
422 * Range Header
423 * Only applies to PLAY, PAUSE, RECORD
424 *
425 * Go ahead and use the Range stuff supplied for HTTP
426 */
427 if(data->state.use_range &&
428 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
429
430 /* Check to see if there is a range set in the custom headers */
431 if(!Curl_checkheaders(conn, "Range") && data->state.range) {
432 Curl_safefree(conn->allocptr.rangeline);
433 conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
434 p_range = conn->allocptr.rangeline;
435 }
436 }
437
438 /*
439 * Sanity check the custom headers
440 */
441 if(Curl_checkheaders(conn, "CSeq")) {
442 failf(data, "CSeq cannot be set as a custom header.");
443 return CURLE_RTSP_CSEQ_ERROR;
444 }
445 if(Curl_checkheaders(conn, "Session")) {
446 failf(data, "Session ID cannot be set as a custom header.");
447 return CURLE_BAD_FUNCTION_ARGUMENT;
448 }
449
450 /* Initialize a dynamic send buffer */
451 req_buffer = Curl_add_buffer_init();
452
453 if(!req_buffer)
454 return CURLE_OUT_OF_MEMORY;
455
456 result =
457 Curl_add_bufferf(&req_buffer,
458 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
459 "CSeq: %ld\r\n", /* CSeq */
460 p_request, p_stream_uri, rtsp->CSeq_sent);
461 if(result)
462 return result;
463
464 /*
465 * Rather than do a normal alloc line, keep the session_id unformatted
466 * to make comparison easier
467 */
468 if(p_session_id) {
469 result = Curl_add_bufferf(&req_buffer, "Session: %s\r\n", p_session_id);
470 if(result)
471 return result;
472 }
473
474 /*
475 * Shared HTTP-like options
476 */
477 result = Curl_add_bufferf(&req_buffer,
478 "%s" /* transport */
479 "%s" /* accept */
480 "%s" /* accept-encoding */
481 "%s" /* range */
482 "%s" /* referrer */
483 "%s" /* user-agent */
484 "%s" /* proxyuserpwd */
485 "%s" /* userpwd */
486 ,
487 p_transport ? p_transport : "",
488 p_accept ? p_accept : "",
489 p_accept_encoding ? p_accept_encoding : "",
490 p_range ? p_range : "",
491 p_referrer ? p_referrer : "",
492 p_uagent ? p_uagent : "",
493 p_proxyuserpwd ? p_proxyuserpwd : "",
494 p_userpwd ? p_userpwd : "");
495
496 /*
497 * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
498 * with basic and digest, it will be freed anyway by the next request
499 */
500 Curl_safefree(conn->allocptr.userpwd);
501 conn->allocptr.userpwd = NULL;
502
503 if(result)
504 return result;
505
506 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
507 result = Curl_add_timecondition(data, req_buffer);
508 if(result)
509 return result;
510 }
511
512 result = Curl_add_custom_headers(conn, FALSE, req_buffer);
513 if(result)
514 return result;
515
516 if(rtspreq == RTSPREQ_ANNOUNCE ||
517 rtspreq == RTSPREQ_SET_PARAMETER ||
518 rtspreq == RTSPREQ_GET_PARAMETER) {
519
520 if(data->set.upload) {
521 putsize = data->state.infilesize;
522 data->set.httpreq = HTTPREQ_PUT;
523
524 }
525 else {
526 postsize = (data->state.infilesize != -1)?
527 data->state.infilesize:
528 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
529 data->set.httpreq = HTTPREQ_POST;
530 }
531
532 if(putsize > 0 || postsize > 0) {
533 /* As stated in the http comments, it is probably not wise to
534 * actually set a custom Content-Length in the headers */
535 if(!Curl_checkheaders(conn, "Content-Length")) {
536 result =
537 Curl_add_bufferf(&req_buffer,
538 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
539 (data->set.upload ? putsize : postsize));
540 if(result)
541 return result;
542 }
543
544 if(rtspreq == RTSPREQ_SET_PARAMETER ||
545 rtspreq == RTSPREQ_GET_PARAMETER) {
546 if(!Curl_checkheaders(conn, "Content-Type")) {
547 result = Curl_add_bufferf(&req_buffer,
548 "Content-Type: text/parameters\r\n");
549 if(result)
550 return result;
551 }
552 }
553
554 if(rtspreq == RTSPREQ_ANNOUNCE) {
555 if(!Curl_checkheaders(conn, "Content-Type")) {
556 result = Curl_add_bufferf(&req_buffer,
557 "Content-Type: application/sdp\r\n");
558 if(result)
559 return result;
560 }
561 }
562
563 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
564 }
565 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
566 /* Check for an empty GET_PARAMETER (heartbeat) request */
567 data->set.httpreq = HTTPREQ_HEAD;
568 data->set.opt_no_body = TRUE;
569 }
570 }
571
572 /* RTSP never allows chunked transfer */
573 data->req.forbidchunk = TRUE;
574 /* Finish the request buffer */
575 result = Curl_add_buffer(&req_buffer, "\r\n", 2);
576 if(result)
577 return result;
578
579 if(postsize > 0) {
580 result = Curl_add_buffer(&req_buffer, data->set.postfields,
581 (size_t)postsize);
582 if(result)
583 return result;
584 }
585
586 /* issue the request */
587 result = Curl_add_buffer_send(&req_buffer, conn,
588 &data->info.request_size, 0, FIRSTSOCKET);
589 if(result) {
590 failf(data, "Failed sending RTSP request");
591 return result;
592 }
593
594 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
595
596 /* Increment the CSeq on success */
597 data->state.rtsp_next_client_CSeq++;
598
599 if(data->req.writebytecount) {
600 /* if a request-body has been sent off, we make sure this progress is
601 noted properly */
602 Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
603 if(Curl_pgrsUpdate(conn))
604 result = CURLE_ABORTED_BY_CALLBACK;
605 }
606
607 return result;
608 }
609
610
rtsp_rtp_readwrite(struct Curl_easy * data,struct connectdata * conn,ssize_t * nread,bool * readmore)611 static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
612 struct connectdata *conn,
613 ssize_t *nread,
614 bool *readmore) {
615 struct SingleRequest *k = &data->req;
616 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
617
618 char *rtp; /* moving pointer to rtp data */
619 ssize_t rtp_dataleft; /* how much data left to parse in this round */
620 char *scratch;
621 CURLcode result;
622
623 if(rtspc->rtp_buf) {
624 /* There was some leftover data the last time. Merge buffers */
625 char *newptr = Curl_saferealloc(rtspc->rtp_buf,
626 rtspc->rtp_bufsize + *nread);
627 if(!newptr) {
628 rtspc->rtp_buf = NULL;
629 rtspc->rtp_bufsize = 0;
630 return CURLE_OUT_OF_MEMORY;
631 }
632 rtspc->rtp_buf = newptr;
633 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
634 rtspc->rtp_bufsize += *nread;
635 rtp = rtspc->rtp_buf;
636 rtp_dataleft = rtspc->rtp_bufsize;
637 }
638 else {
639 /* Just parse the request buffer directly */
640 rtp = k->str;
641 rtp_dataleft = *nread;
642 }
643
644 while((rtp_dataleft > 0) &&
645 (rtp[0] == '$')) {
646 if(rtp_dataleft > 4) {
647 int rtp_length;
648
649 /* Parse the header */
650 /* The channel identifier immediately follows and is 1 byte */
651 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
652
653 /* The length is two bytes */
654 rtp_length = RTP_PKT_LENGTH(rtp);
655
656 if(rtp_dataleft < rtp_length + 4) {
657 /* Need more - incomplete payload*/
658 *readmore = TRUE;
659 break;
660 }
661 /* We have the full RTP interleaved packet
662 * Write out the header including the leading '$' */
663 DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
664 rtspc->rtp_channel, rtp_length));
665 result = rtp_client_write(conn, &rtp[0], rtp_length + 4);
666 if(result) {
667 failf(data, "Got an error writing an RTP packet");
668 *readmore = FALSE;
669 Curl_safefree(rtspc->rtp_buf);
670 rtspc->rtp_buf = NULL;
671 rtspc->rtp_bufsize = 0;
672 return result;
673 }
674
675 /* Move forward in the buffer */
676 rtp_dataleft -= rtp_length + 4;
677 rtp += rtp_length + 4;
678
679 if(data->set.rtspreq == RTSPREQ_RECEIVE) {
680 /* If we are in a passive receive, give control back
681 * to the app as often as we can.
682 */
683 k->keepon &= ~KEEP_RECV;
684 }
685 }
686 else {
687 /* Need more - incomplete header */
688 *readmore = TRUE;
689 break;
690 }
691 }
692
693 if(rtp_dataleft != 0 && rtp[0] == '$') {
694 DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
695 *readmore ? "(READMORE)" : ""));
696
697 /* Store the incomplete RTP packet for a "rewind" */
698 scratch = malloc(rtp_dataleft);
699 if(!scratch) {
700 Curl_safefree(rtspc->rtp_buf);
701 rtspc->rtp_buf = NULL;
702 rtspc->rtp_bufsize = 0;
703 return CURLE_OUT_OF_MEMORY;
704 }
705 memcpy(scratch, rtp, rtp_dataleft);
706 Curl_safefree(rtspc->rtp_buf);
707 rtspc->rtp_buf = scratch;
708 rtspc->rtp_bufsize = rtp_dataleft;
709
710 /* As far as the transfer is concerned, this data is consumed */
711 *nread = 0;
712 return CURLE_OK;
713 }
714 /* Fix up k->str to point just after the last RTP packet */
715 k->str += *nread - rtp_dataleft;
716
717 /* either all of the data has been read or...
718 * rtp now points at the next byte to parse
719 */
720 if(rtp_dataleft > 0)
721 DEBUGASSERT(k->str[0] == rtp[0]);
722
723 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
724
725 *nread = rtp_dataleft;
726
727 /* If we get here, we have finished with the leftover/merge buffer */
728 Curl_safefree(rtspc->rtp_buf);
729 rtspc->rtp_buf = NULL;
730 rtspc->rtp_bufsize = 0;
731
732 return CURLE_OK;
733 }
734
735 static
rtp_client_write(struct connectdata * conn,char * ptr,size_t len)736 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
737 {
738 struct Curl_easy *data = conn->data;
739 size_t wrote;
740 curl_write_callback writeit;
741 void *user_ptr;
742
743 if(len == 0) {
744 failf(data, "Cannot write a 0 size RTP packet.");
745 return CURLE_WRITE_ERROR;
746 }
747
748 /* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
749 function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
750 data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
751 pointer to write out the RTP data. */
752 if(data->set.fwrite_rtp) {
753 writeit = data->set.fwrite_rtp;
754 user_ptr = data->set.rtp_out;
755 }
756 else {
757 writeit = data->set.fwrite_func;
758 user_ptr = data->set.out;
759 }
760
761 Curl_set_in_callback(data, true);
762 wrote = writeit(ptr, 1, len, user_ptr);
763 Curl_set_in_callback(data, false);
764
765 if(CURL_WRITEFUNC_PAUSE == wrote) {
766 failf(data, "Cannot pause RTP");
767 return CURLE_WRITE_ERROR;
768 }
769
770 if(wrote != len) {
771 failf(data, "Failed writing RTP data");
772 return CURLE_WRITE_ERROR;
773 }
774
775 return CURLE_OK;
776 }
777
Curl_rtsp_parseheader(struct connectdata * conn,char * header)778 CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
779 char *header)
780 {
781 struct Curl_easy *data = conn->data;
782 long CSeq = 0;
783
784 if(checkprefix("CSeq:", header)) {
785 /* Store the received CSeq. Match is verified in rtsp_done */
786 int nc = sscanf(&header[4], ": %ld", &CSeq);
787 if(nc == 1) {
788 struct RTSP *rtsp = data->req.protop;
789 rtsp->CSeq_recv = CSeq; /* mark the request */
790 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
791 }
792 else {
793 failf(data, "Unable to read the CSeq header: [%s]", header);
794 return CURLE_RTSP_CSEQ_ERROR;
795 }
796 }
797 else if(checkprefix("Session:", header)) {
798 char *start;
799
800 /* Find the first non-space letter */
801 start = header + 8;
802 while(*start && ISSPACE(*start))
803 start++;
804
805 if(!*start) {
806 failf(data, "Got a blank Session ID");
807 }
808 else if(data->set.str[STRING_RTSP_SESSION_ID]) {
809 /* If the Session ID is set, then compare */
810 if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
811 strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
812 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
813 start, data->set.str[STRING_RTSP_SESSION_ID]);
814 return CURLE_RTSP_SESSION_ERROR;
815 }
816 }
817 else {
818 /* If the Session ID is not set, and we find it in a response, then set
819 * it.
820 *
821 * Allow any non whitespace content, up to the field separator or end of
822 * line. RFC 2326 isn't 100% clear on the session ID and for example
823 * gstreamer does url-encoded session ID's not covered by the standard.
824 */
825 char *end = start;
826 while(*end && *end != ';' && !ISSPACE(*end))
827 end++;
828
829 /* Copy the id substring into a new buffer */
830 data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
831 if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
832 return CURLE_OUT_OF_MEMORY;
833 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
834 (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
835 }
836 }
837 return CURLE_OK;
838 }
839
840 #endif /* CURL_DISABLE_RTSP */
841