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comparison mupdf-source/thirdparty/curl/lib/rtsp.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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 #define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
46
47 #define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) | \
48 ((int)((unsigned char)((p)[3]))))
49
50 /* protocol-specific functions set up to be called by the main engine */
51 static CURLcode rtsp_do(struct connectdata *conn, bool *done);
52 static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature);
53 static CURLcode rtsp_connect(struct connectdata *conn, bool *done);
54 static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead);
55 static int rtsp_getsock_do(struct connectdata *conn, curl_socket_t *socks);
56
57 /*
58 * Parse and write out any available RTP data.
59 *
60 * nread: amount of data left after k->str. will be modified if RTP
61 * data is parsed and k->str is moved up
62 * readmore: whether or not the RTP parser needs more data right away
63 */
64 static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
65 struct connectdata *conn,
66 ssize_t *nread,
67 bool *readmore);
68
69 static CURLcode rtsp_setup_connection(struct connectdata *conn);
70 static unsigned int rtsp_conncheck(struct connectdata *check,
71 unsigned int checks_to_perform);
72
73 /* this returns the socket to wait for in the DO and DOING state for the multi
74 interface and then we're always _sending_ a request and thus we wait for
75 the single socket to become writable only */
76 static int rtsp_getsock_do(struct connectdata *conn,
77 curl_socket_t *socks)
78 {
79 /* write mode */
80 socks[0] = conn->sock[FIRSTSOCKET];
81 return GETSOCK_WRITESOCK(0);
82 }
83
84 static
85 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len);
86
87
88 /*
89 * RTSP handler interface.
90 */
91 const struct Curl_handler Curl_handler_rtsp = {
92 "RTSP", /* scheme */
93 rtsp_setup_connection, /* setup_connection */
94 rtsp_do, /* do_it */
95 rtsp_done, /* done */
96 ZERO_NULL, /* do_more */
97 rtsp_connect, /* connect_it */
98 ZERO_NULL, /* connecting */
99 ZERO_NULL, /* doing */
100 ZERO_NULL, /* proto_getsock */
101 rtsp_getsock_do, /* doing_getsock */
102 ZERO_NULL, /* domore_getsock */
103 ZERO_NULL, /* perform_getsock */
104 rtsp_disconnect, /* disconnect */
105 rtsp_rtp_readwrite, /* readwrite */
106 rtsp_conncheck, /* connection_check */
107 PORT_RTSP, /* defport */
108 CURLPROTO_RTSP, /* protocol */
109 PROTOPT_NONE /* flags */
110 };
111
112
113 static CURLcode rtsp_setup_connection(struct connectdata *conn)
114 {
115 struct RTSP *rtsp;
116
117 conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP));
118 if(!rtsp)
119 return CURLE_OUT_OF_MEMORY;
120
121 return CURLE_OK;
122 }
123
124
125 /*
126 * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
127 * want to block the application forever while receiving a stream. Therefore,
128 * we cannot assume that an RTSP socket is dead just because it is readable.
129 *
130 * Instead, if it is readable, run Curl_connalive() to peek at the socket
131 * and distinguish between closed and data.
132 */
133 static bool rtsp_connisdead(struct connectdata *check)
134 {
135 int sval;
136 bool ret_val = TRUE;
137
138 sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
139 if(sval == 0) {
140 /* timeout */
141 ret_val = FALSE;
142 }
143 else if(sval & CURL_CSELECT_ERR) {
144 /* socket is in an error state */
145 ret_val = TRUE;
146 }
147 else if(sval & CURL_CSELECT_IN) {
148 /* readable with no error. could still be closed */
149 ret_val = !Curl_connalive(check);
150 }
151
152 return ret_val;
153 }
154
155 /*
156 * Function to check on various aspects of a connection.
157 */
158 static unsigned int rtsp_conncheck(struct connectdata *check,
159 unsigned int checks_to_perform)
160 {
161 unsigned int ret_val = CONNRESULT_NONE;
162
163 if(checks_to_perform & CONNCHECK_ISDEAD) {
164 if(rtsp_connisdead(check))
165 ret_val |= CONNRESULT_DEAD;
166 }
167
168 return ret_val;
169 }
170
171
172 static CURLcode rtsp_connect(struct connectdata *conn, bool *done)
173 {
174 CURLcode httpStatus;
175 struct Curl_easy *data = conn->data;
176
177 httpStatus = Curl_http_connect(conn, done);
178
179 /* Initialize the CSeq if not already done */
180 if(data->state.rtsp_next_client_CSeq == 0)
181 data->state.rtsp_next_client_CSeq = 1;
182 if(data->state.rtsp_next_server_CSeq == 0)
183 data->state.rtsp_next_server_CSeq = 1;
184
185 conn->proto.rtspc.rtp_channel = -1;
186
187 return httpStatus;
188 }
189
190 static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead)
191 {
192 (void) dead;
193 Curl_safefree(conn->proto.rtspc.rtp_buf);
194 return CURLE_OK;
195 }
196
197
198 static CURLcode rtsp_done(struct connectdata *conn,
199 CURLcode status, bool premature)
200 {
201 struct Curl_easy *data = conn->data;
202 struct RTSP *rtsp = data->req.protop;
203 CURLcode httpStatus;
204
205 /* Bypass HTTP empty-reply checks on receive */
206 if(data->set.rtspreq == RTSPREQ_RECEIVE)
207 premature = TRUE;
208
209 httpStatus = Curl_http_done(conn, status, premature);
210
211 if(rtsp) {
212 /* Check the sequence numbers */
213 long CSeq_sent = rtsp->CSeq_sent;
214 long CSeq_recv = rtsp->CSeq_recv;
215 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
216 failf(data,
217 "The CSeq of this request %ld did not match the response %ld",
218 CSeq_sent, CSeq_recv);
219 return CURLE_RTSP_CSEQ_ERROR;
220 }
221 if(data->set.rtspreq == RTSPREQ_RECEIVE &&
222 (conn->proto.rtspc.rtp_channel == -1)) {
223 infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv);
224 }
225 }
226
227 return httpStatus;
228 }
229
230 static CURLcode rtsp_do(struct connectdata *conn, bool *done)
231 {
232 struct Curl_easy *data = conn->data;
233 CURLcode result = CURLE_OK;
234 Curl_RtspReq rtspreq = data->set.rtspreq;
235 struct RTSP *rtsp = data->req.protop;
236 Curl_send_buffer *req_buffer;
237 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
238 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
239
240 const char *p_request = NULL;
241 const char *p_session_id = NULL;
242 const char *p_accept = NULL;
243 const char *p_accept_encoding = NULL;
244 const char *p_range = NULL;
245 const char *p_referrer = NULL;
246 const char *p_stream_uri = NULL;
247 const char *p_transport = NULL;
248 const char *p_uagent = NULL;
249 const char *p_proxyuserpwd = NULL;
250 const char *p_userpwd = NULL;
251
252 *done = TRUE;
253
254 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
255 rtsp->CSeq_recv = 0;
256
257 /* Setup the 'p_request' pointer to the proper p_request string
258 * Since all RTSP requests are included here, there is no need to
259 * support custom requests like HTTP.
260 **/
261 data->set.opt_no_body = TRUE; /* most requests don't contain a body */
262 switch(rtspreq) {
263 default:
264 failf(data, "Got invalid RTSP request");
265 return CURLE_BAD_FUNCTION_ARGUMENT;
266 case RTSPREQ_OPTIONS:
267 p_request = "OPTIONS";
268 break;
269 case RTSPREQ_DESCRIBE:
270 p_request = "DESCRIBE";
271 data->set.opt_no_body = FALSE;
272 break;
273 case RTSPREQ_ANNOUNCE:
274 p_request = "ANNOUNCE";
275 break;
276 case RTSPREQ_SETUP:
277 p_request = "SETUP";
278 break;
279 case RTSPREQ_PLAY:
280 p_request = "PLAY";
281 break;
282 case RTSPREQ_PAUSE:
283 p_request = "PAUSE";
284 break;
285 case RTSPREQ_TEARDOWN:
286 p_request = "TEARDOWN";
287 break;
288 case RTSPREQ_GET_PARAMETER:
289 /* GET_PARAMETER's no_body status is determined later */
290 p_request = "GET_PARAMETER";
291 data->set.opt_no_body = FALSE;
292 break;
293 case RTSPREQ_SET_PARAMETER:
294 p_request = "SET_PARAMETER";
295 break;
296 case RTSPREQ_RECORD:
297 p_request = "RECORD";
298 break;
299 case RTSPREQ_RECEIVE:
300 p_request = "";
301 /* Treat interleaved RTP as body*/
302 data->set.opt_no_body = FALSE;
303 break;
304 case RTSPREQ_LAST:
305 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
306 return CURLE_BAD_FUNCTION_ARGUMENT;
307 }
308
309 if(rtspreq == RTSPREQ_RECEIVE) {
310 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
311
312 return result;
313 }
314
315 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
316 if(!p_session_id &&
317 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
318 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
319 p_request);
320 return CURLE_BAD_FUNCTION_ARGUMENT;
321 }
322
323 /* Stream URI. Default to server '*' if not specified */
324 if(data->set.str[STRING_RTSP_STREAM_URI]) {
325 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
326 }
327 else {
328 p_stream_uri = "*";
329 }
330
331 /* Transport Header for SETUP requests */
332 p_transport = Curl_checkheaders(conn, "Transport");
333 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
334 /* New Transport: setting? */
335 if(data->set.str[STRING_RTSP_TRANSPORT]) {
336 Curl_safefree(conn->allocptr.rtsp_transport);
337
338 conn->allocptr.rtsp_transport =
339 aprintf("Transport: %s\r\n",
340 data->set.str[STRING_RTSP_TRANSPORT]);
341 if(!conn->allocptr.rtsp_transport)
342 return CURLE_OUT_OF_MEMORY;
343 }
344 else {
345 failf(data,
346 "Refusing to issue an RTSP SETUP without a Transport: header.");
347 return CURLE_BAD_FUNCTION_ARGUMENT;
348 }
349
350 p_transport = conn->allocptr.rtsp_transport;
351 }
352
353 /* Accept Headers for DESCRIBE requests */
354 if(rtspreq == RTSPREQ_DESCRIBE) {
355 /* Accept Header */
356 p_accept = Curl_checkheaders(conn, "Accept")?
357 NULL:"Accept: application/sdp\r\n";
358
359 /* Accept-Encoding header */
360 if(!Curl_checkheaders(conn, "Accept-Encoding") &&
361 data->set.str[STRING_ENCODING]) {
362 Curl_safefree(conn->allocptr.accept_encoding);
363 conn->allocptr.accept_encoding =
364 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
365
366 if(!conn->allocptr.accept_encoding)
367 return CURLE_OUT_OF_MEMORY;
368
369 p_accept_encoding = conn->allocptr.accept_encoding;
370 }
371 }
372
373 /* The User-Agent string might have been allocated in url.c already, because
374 it might have been used in the proxy connect, but if we have got a header
375 with the user-agent string specified, we erase the previously made string
376 here. */
377 if(Curl_checkheaders(conn, "User-Agent") && conn->allocptr.uagent) {
378 Curl_safefree(conn->allocptr.uagent);
379 conn->allocptr.uagent = NULL;
380 }
381 else if(!Curl_checkheaders(conn, "User-Agent") &&
382 data->set.str[STRING_USERAGENT]) {
383 p_uagent = conn->allocptr.uagent;
384 }
385
386 /* setup the authentication headers */
387 result = Curl_http_output_auth(conn, p_request, p_stream_uri, FALSE);
388 if(result)
389 return result;
390
391 p_proxyuserpwd = conn->allocptr.proxyuserpwd;
392 p_userpwd = conn->allocptr.userpwd;
393
394 /* Referrer */
395 Curl_safefree(conn->allocptr.ref);
396 if(data->change.referer && !Curl_checkheaders(conn, "Referer"))
397 conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
398 else
399 conn->allocptr.ref = NULL;
400
401 p_referrer = conn->allocptr.ref;
402
403 /*
404 * Range Header
405 * Only applies to PLAY, PAUSE, RECORD
406 *
407 * Go ahead and use the Range stuff supplied for HTTP
408 */
409 if(data->state.use_range &&
410 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
411
412 /* Check to see if there is a range set in the custom headers */
413 if(!Curl_checkheaders(conn, "Range") && data->state.range) {
414 Curl_safefree(conn->allocptr.rangeline);
415 conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
416 p_range = conn->allocptr.rangeline;
417 }
418 }
419
420 /*
421 * Sanity check the custom headers
422 */
423 if(Curl_checkheaders(conn, "CSeq")) {
424 failf(data, "CSeq cannot be set as a custom header.");
425 return CURLE_RTSP_CSEQ_ERROR;
426 }
427 if(Curl_checkheaders(conn, "Session")) {
428 failf(data, "Session ID cannot be set as a custom header.");
429 return CURLE_BAD_FUNCTION_ARGUMENT;
430 }
431
432 /* Initialize a dynamic send buffer */
433 req_buffer = Curl_add_buffer_init();
434
435 if(!req_buffer)
436 return CURLE_OUT_OF_MEMORY;
437
438 result =
439 Curl_add_bufferf(&req_buffer,
440 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
441 "CSeq: %ld\r\n", /* CSeq */
442 p_request, p_stream_uri, rtsp->CSeq_sent);
443 if(result)
444 return result;
445
446 /*
447 * Rather than do a normal alloc line, keep the session_id unformatted
448 * to make comparison easier
449 */
450 if(p_session_id) {
451 result = Curl_add_bufferf(&req_buffer, "Session: %s\r\n", p_session_id);
452 if(result)
453 return result;
454 }
455
456 /*
457 * Shared HTTP-like options
458 */
459 result = Curl_add_bufferf(&req_buffer,
460 "%s" /* transport */
461 "%s" /* accept */
462 "%s" /* accept-encoding */
463 "%s" /* range */
464 "%s" /* referrer */
465 "%s" /* user-agent */
466 "%s" /* proxyuserpwd */
467 "%s" /* userpwd */
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 p_proxyuserpwd ? p_proxyuserpwd : "",
476 p_userpwd ? p_userpwd : "");
477
478 /*
479 * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
480 * with basic and digest, it will be freed anyway by the next request
481 */
482 Curl_safefree(conn->allocptr.userpwd);
483 conn->allocptr.userpwd = NULL;
484
485 if(result)
486 return result;
487
488 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
489 result = Curl_add_timecondition(conn, req_buffer);
490 if(result)
491 return result;
492 }
493
494 result = Curl_add_custom_headers(conn, FALSE, req_buffer);
495 if(result)
496 return result;
497
498 if(rtspreq == RTSPREQ_ANNOUNCE ||
499 rtspreq == RTSPREQ_SET_PARAMETER ||
500 rtspreq == RTSPREQ_GET_PARAMETER) {
501
502 if(data->set.upload) {
503 putsize = data->state.infilesize;
504 data->set.httpreq = HTTPREQ_PUT;
505
506 }
507 else {
508 postsize = (data->state.infilesize != -1)?
509 data->state.infilesize:
510 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
511 data->set.httpreq = HTTPREQ_POST;
512 }
513
514 if(putsize > 0 || postsize > 0) {
515 /* As stated in the http comments, it is probably not wise to
516 * actually set a custom Content-Length in the headers */
517 if(!Curl_checkheaders(conn, "Content-Length")) {
518 result =
519 Curl_add_bufferf(&req_buffer,
520 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
521 (data->set.upload ? putsize : postsize));
522 if(result)
523 return result;
524 }
525
526 if(rtspreq == RTSPREQ_SET_PARAMETER ||
527 rtspreq == RTSPREQ_GET_PARAMETER) {
528 if(!Curl_checkheaders(conn, "Content-Type")) {
529 result = Curl_add_bufferf(&req_buffer,
530 "Content-Type: text/parameters\r\n");
531 if(result)
532 return result;
533 }
534 }
535
536 if(rtspreq == RTSPREQ_ANNOUNCE) {
537 if(!Curl_checkheaders(conn, "Content-Type")) {
538 result = Curl_add_bufferf(&req_buffer,
539 "Content-Type: application/sdp\r\n");
540 if(result)
541 return result;
542 }
543 }
544
545 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
546 }
547 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
548 /* Check for an empty GET_PARAMETER (heartbeat) request */
549 data->set.httpreq = HTTPREQ_HEAD;
550 data->set.opt_no_body = TRUE;
551 }
552 }
553
554 /* RTSP never allows chunked transfer */
555 data->req.forbidchunk = TRUE;
556 /* Finish the request buffer */
557 result = Curl_add_buffer(&req_buffer, "\r\n", 2);
558 if(result)
559 return result;
560
561 if(postsize > 0) {
562 result = Curl_add_buffer(&req_buffer, data->set.postfields,
563 (size_t)postsize);
564 if(result)
565 return result;
566 }
567
568 /* issue the request */
569 result = Curl_add_buffer_send(&req_buffer, conn,
570 &data->info.request_size, 0, FIRSTSOCKET);
571 if(result) {
572 failf(data, "Failed sending RTSP request");
573 return result;
574 }
575
576 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
577
578 /* Increment the CSeq on success */
579 data->state.rtsp_next_client_CSeq++;
580
581 if(data->req.writebytecount) {
582 /* if a request-body has been sent off, we make sure this progress is
583 noted properly */
584 Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
585 if(Curl_pgrsUpdate(conn))
586 result = CURLE_ABORTED_BY_CALLBACK;
587 }
588
589 return result;
590 }
591
592
593 static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
594 struct connectdata *conn,
595 ssize_t *nread,
596 bool *readmore) {
597 struct SingleRequest *k = &data->req;
598 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
599
600 char *rtp; /* moving pointer to rtp data */
601 ssize_t rtp_dataleft; /* how much data left to parse in this round */
602 char *scratch;
603 CURLcode result;
604
605 if(rtspc->rtp_buf) {
606 /* There was some leftover data the last time. Merge buffers */
607 char *newptr = Curl_saferealloc(rtspc->rtp_buf,
608 rtspc->rtp_bufsize + *nread);
609 if(!newptr) {
610 rtspc->rtp_buf = NULL;
611 rtspc->rtp_bufsize = 0;
612 return CURLE_OUT_OF_MEMORY;
613 }
614 rtspc->rtp_buf = newptr;
615 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
616 rtspc->rtp_bufsize += *nread;
617 rtp = rtspc->rtp_buf;
618 rtp_dataleft = rtspc->rtp_bufsize;
619 }
620 else {
621 /* Just parse the request buffer directly */
622 rtp = k->str;
623 rtp_dataleft = *nread;
624 }
625
626 while((rtp_dataleft > 0) &&
627 (rtp[0] == '$')) {
628 if(rtp_dataleft > 4) {
629 int rtp_length;
630
631 /* Parse the header */
632 /* The channel identifier immediately follows and is 1 byte */
633 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
634
635 /* The length is two bytes */
636 rtp_length = RTP_PKT_LENGTH(rtp);
637
638 if(rtp_dataleft < rtp_length + 4) {
639 /* Need more - incomplete payload*/
640 *readmore = TRUE;
641 break;
642 }
643 /* We have the full RTP interleaved packet
644 * Write out the header including the leading '$' */
645 DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n",
646 rtspc->rtp_channel, rtp_length));
647 result = rtp_client_write(conn, &rtp[0], rtp_length + 4);
648 if(result) {
649 failf(data, "Got an error writing an RTP packet");
650 *readmore = FALSE;
651 Curl_safefree(rtspc->rtp_buf);
652 rtspc->rtp_buf = NULL;
653 rtspc->rtp_bufsize = 0;
654 return result;
655 }
656
657 /* Move forward in the buffer */
658 rtp_dataleft -= rtp_length + 4;
659 rtp += rtp_length + 4;
660
661 if(data->set.rtspreq == RTSPREQ_RECEIVE) {
662 /* If we are in a passive receive, give control back
663 * to the app as often as we can.
664 */
665 k->keepon &= ~KEEP_RECV;
666 }
667 }
668 else {
669 /* Need more - incomplete header */
670 *readmore = TRUE;
671 break;
672 }
673 }
674
675 if(rtp_dataleft != 0 && rtp[0] == '$') {
676 DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft,
677 *readmore ? "(READMORE)" : ""));
678
679 /* Store the incomplete RTP packet for a "rewind" */
680 scratch = malloc(rtp_dataleft);
681 if(!scratch) {
682 Curl_safefree(rtspc->rtp_buf);
683 rtspc->rtp_buf = NULL;
684 rtspc->rtp_bufsize = 0;
685 return CURLE_OUT_OF_MEMORY;
686 }
687 memcpy(scratch, rtp, rtp_dataleft);
688 Curl_safefree(rtspc->rtp_buf);
689 rtspc->rtp_buf = scratch;
690 rtspc->rtp_bufsize = rtp_dataleft;
691
692 /* As far as the transfer is concerned, this data is consumed */
693 *nread = 0;
694 return CURLE_OK;
695 }
696 /* Fix up k->str to point just after the last RTP packet */
697 k->str += *nread - rtp_dataleft;
698
699 /* either all of the data has been read or...
700 * rtp now points at the next byte to parse
701 */
702 if(rtp_dataleft > 0)
703 DEBUGASSERT(k->str[0] == rtp[0]);
704
705 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
706
707 *nread = rtp_dataleft;
708
709 /* If we get here, we have finished with the leftover/merge buffer */
710 Curl_safefree(rtspc->rtp_buf);
711 rtspc->rtp_buf = NULL;
712 rtspc->rtp_bufsize = 0;
713
714 return CURLE_OK;
715 }
716
717 static
718 CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
719 {
720 struct Curl_easy *data = conn->data;
721 size_t wrote;
722 curl_write_callback writeit;
723 void *user_ptr;
724
725 if(len == 0) {
726 failf(data, "Cannot write a 0 size RTP packet.");
727 return CURLE_WRITE_ERROR;
728 }
729
730 /* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
731 function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
732 data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
733 pointer to write out the RTP data. */
734 if(data->set.fwrite_rtp) {
735 writeit = data->set.fwrite_rtp;
736 user_ptr = data->set.rtp_out;
737 }
738 else {
739 writeit = data->set.fwrite_func;
740 user_ptr = data->set.out;
741 }
742
743 Curl_set_in_callback(data, true);
744 wrote = writeit(ptr, 1, len, user_ptr);
745 Curl_set_in_callback(data, false);
746
747 if(CURL_WRITEFUNC_PAUSE == wrote) {
748 failf(data, "Cannot pause RTP");
749 return CURLE_WRITE_ERROR;
750 }
751
752 if(wrote != len) {
753 failf(data, "Failed writing RTP data");
754 return CURLE_WRITE_ERROR;
755 }
756
757 return CURLE_OK;
758 }
759
760 CURLcode Curl_rtsp_parseheader(struct connectdata *conn,
761 char *header)
762 {
763 struct Curl_easy *data = conn->data;
764 long CSeq = 0;
765
766 if(checkprefix("CSeq:", header)) {
767 /* Store the received CSeq. Match is verified in rtsp_done */
768 int nc = sscanf(&header[4], ": %ld", &CSeq);
769 if(nc == 1) {
770 struct RTSP *rtsp = data->req.protop;
771 rtsp->CSeq_recv = CSeq; /* mark the request */
772 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
773 }
774 else {
775 failf(data, "Unable to read the CSeq header: [%s]", header);
776 return CURLE_RTSP_CSEQ_ERROR;
777 }
778 }
779 else if(checkprefix("Session:", header)) {
780 char *start;
781
782 /* Find the first non-space letter */
783 start = header + 8;
784 while(*start && ISSPACE(*start))
785 start++;
786
787 if(!*start) {
788 failf(data, "Got a blank Session ID");
789 }
790 else if(data->set.str[STRING_RTSP_SESSION_ID]) {
791 /* If the Session ID is set, then compare */
792 if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID],
793 strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) {
794 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
795 start, data->set.str[STRING_RTSP_SESSION_ID]);
796 return CURLE_RTSP_SESSION_ERROR;
797 }
798 }
799 else {
800 /* If the Session ID is not set, and we find it in a response, then set
801 * it.
802 *
803 * Allow any non whitespace content, up to the field separator or end of
804 * line. RFC 2326 isn't 100% clear on the session ID and for example
805 * gstreamer does url-encoded session ID's not covered by the standard.
806 */
807 char *end = start;
808 while(*end && *end != ';' && !ISSPACE(*end))
809 end++;
810
811 /* Copy the id substring into a new buffer */
812 data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1);
813 if(data->set.str[STRING_RTSP_SESSION_ID] == NULL)
814 return CURLE_OUT_OF_MEMORY;
815 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start);
816 (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0';
817 }
818 }
819 return CURLE_OK;
820 }
821
822 #endif /* CURL_DISABLE_RTSP */