1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "curl_setup.h"
26
27 #if !defined(CURL_DISABLE_RTSP) && !defined(USE_HYPER)
28
29 #include "urldata.h"
30 #include <curl/curl.h>
31 #include "transfer.h"
32 #include "sendf.h"
33 #include "multiif.h"
34 #include "http.h"
35 #include "url.h"
36 #include "progress.h"
37 #include "rtsp.h"
38 #include "strcase.h"
39 #include "select.h"
40 #include "connect.h"
41 #include "cfilters.h"
42 #include "strdup.h"
43 /* The last 3 #include files should be in this order */
44 #include "curl_printf.h"
45 #include "curl_memory.h"
46 #include "memdebug.h"
47
48 #define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1])))
49
50 #define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) | \
51 ((int)((unsigned char)((p)[3]))))
52
53 /* protocol-specific functions set up to be called by the main engine */
54 static CURLcode rtsp_do(struct Curl_easy *data, bool *done);
55 static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
56 static CURLcode rtsp_connect(struct Curl_easy *data, bool *done);
57 static CURLcode rtsp_disconnect(struct Curl_easy *data,
58 struct connectdata *conn, bool dead);
59 static int rtsp_getsock_do(struct Curl_easy *data,
60 struct connectdata *conn, curl_socket_t *socks);
61
62 /*
63 * Parse and write out any available RTP data.
64 *
65 * nread: amount of data left after k->str. will be modified if RTP
66 * data is parsed and k->str is moved up
67 * readmore: whether or not the RTP parser needs more data right away
68 */
69 static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
70 struct connectdata *conn,
71 ssize_t *nread,
72 bool *readmore);
73
74 static CURLcode rtsp_setup_connection(struct Curl_easy *data,
75 struct connectdata *conn);
76 static unsigned int rtsp_conncheck(struct Curl_easy *data,
77 struct connectdata *check,
78 unsigned int checks_to_perform);
79
80 /* this returns the socket to wait for in the DO and DOING state for the multi
81 interface and then we're always _sending_ a request and thus we wait for
82 the single socket to become writable only */
rtsp_getsock_do(struct Curl_easy * data,struct connectdata * conn,curl_socket_t * socks)83 static int rtsp_getsock_do(struct Curl_easy *data, struct connectdata *conn,
84 curl_socket_t *socks)
85 {
86 /* write mode */
87 (void)data;
88 socks[0] = conn->sock[FIRSTSOCKET];
89 return GETSOCK_WRITESOCK(0);
90 }
91
92 static
93 CURLcode rtp_client_write(struct Curl_easy *data, char *ptr, size_t len);
94
95
96 /*
97 * RTSP handler interface.
98 */
99 const struct Curl_handler Curl_handler_rtsp = {
100 "RTSP", /* scheme */
101 rtsp_setup_connection, /* setup_connection */
102 rtsp_do, /* do_it */
103 rtsp_done, /* done */
104 ZERO_NULL, /* do_more */
105 rtsp_connect, /* connect_it */
106 ZERO_NULL, /* connecting */
107 ZERO_NULL, /* doing */
108 ZERO_NULL, /* proto_getsock */
109 rtsp_getsock_do, /* doing_getsock */
110 ZERO_NULL, /* domore_getsock */
111 ZERO_NULL, /* perform_getsock */
112 rtsp_disconnect, /* disconnect */
113 rtsp_rtp_readwrite, /* readwrite */
114 rtsp_conncheck, /* connection_check */
115 ZERO_NULL, /* attach connection */
116 PORT_RTSP, /* defport */
117 CURLPROTO_RTSP, /* protocol */
118 CURLPROTO_RTSP, /* family */
119 PROTOPT_NONE /* flags */
120 };
121
122
rtsp_setup_connection(struct Curl_easy * data,struct connectdata * conn)123 static CURLcode rtsp_setup_connection(struct Curl_easy *data,
124 struct connectdata *conn)
125 {
126 struct RTSP *rtsp;
127 (void)conn;
128
129 data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
130 if(!rtsp)
131 return CURLE_OUT_OF_MEMORY;
132
133 return CURLE_OK;
134 }
135
136
137 /*
138 * Function to check on various aspects of a connection.
139 */
rtsp_conncheck(struct Curl_easy * data,struct connectdata * conn,unsigned int checks_to_perform)140 static unsigned int rtsp_conncheck(struct Curl_easy *data,
141 struct connectdata *conn,
142 unsigned int checks_to_perform)
143 {
144 unsigned int ret_val = CONNRESULT_NONE;
145 (void)data;
146
147 if(checks_to_perform & CONNCHECK_ISDEAD) {
148 bool input_pending;
149 if(!Curl_conn_is_alive(data, conn, &input_pending))
150 ret_val |= CONNRESULT_DEAD;
151 }
152
153 return ret_val;
154 }
155
156
rtsp_connect(struct Curl_easy * data,bool * done)157 static CURLcode rtsp_connect(struct Curl_easy *data, bool *done)
158 {
159 CURLcode httpStatus;
160
161 httpStatus = Curl_http_connect(data, done);
162
163 /* Initialize the CSeq if not already done */
164 if(data->state.rtsp_next_client_CSeq == 0)
165 data->state.rtsp_next_client_CSeq = 1;
166 if(data->state.rtsp_next_server_CSeq == 0)
167 data->state.rtsp_next_server_CSeq = 1;
168
169 data->conn->proto.rtspc.rtp_channel = -1;
170
171 return httpStatus;
172 }
173
rtsp_disconnect(struct Curl_easy * data,struct connectdata * conn,bool dead)174 static CURLcode rtsp_disconnect(struct Curl_easy *data,
175 struct connectdata *conn, bool dead)
176 {
177 (void) dead;
178 (void) data;
179 Curl_safefree(conn->proto.rtspc.rtp_buf);
180 return CURLE_OK;
181 }
182
183
rtsp_done(struct Curl_easy * data,CURLcode status,bool premature)184 static CURLcode rtsp_done(struct Curl_easy *data,
185 CURLcode status, bool premature)
186 {
187 struct RTSP *rtsp = data->req.p.rtsp;
188 CURLcode httpStatus;
189
190 /* Bypass HTTP empty-reply checks on receive */
191 if(data->set.rtspreq == RTSPREQ_RECEIVE)
192 premature = TRUE;
193
194 httpStatus = Curl_http_done(data, status, premature);
195
196 if(rtsp && !status && !httpStatus) {
197 /* Check the sequence numbers */
198 long CSeq_sent = rtsp->CSeq_sent;
199 long CSeq_recv = rtsp->CSeq_recv;
200 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
201 failf(data,
202 "The CSeq of this request %ld did not match the response %ld",
203 CSeq_sent, CSeq_recv);
204 return CURLE_RTSP_CSEQ_ERROR;
205 }
206 if(data->set.rtspreq == RTSPREQ_RECEIVE &&
207 (data->conn->proto.rtspc.rtp_channel == -1)) {
208 infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
209 }
210 }
211
212 return httpStatus;
213 }
214
rtsp_do(struct Curl_easy * data,bool * done)215 static CURLcode rtsp_do(struct Curl_easy *data, bool *done)
216 {
217 struct connectdata *conn = data->conn;
218 CURLcode result = CURLE_OK;
219 Curl_RtspReq rtspreq = data->set.rtspreq;
220 struct RTSP *rtsp = data->req.p.rtsp;
221 struct dynbuf req_buffer;
222 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
223 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
224
225 const char *p_request = NULL;
226 const char *p_session_id = NULL;
227 const char *p_accept = NULL;
228 const char *p_accept_encoding = NULL;
229 const char *p_range = NULL;
230 const char *p_referrer = NULL;
231 const char *p_stream_uri = NULL;
232 const char *p_transport = NULL;
233 const char *p_uagent = NULL;
234 const char *p_proxyuserpwd = NULL;
235 const char *p_userpwd = NULL;
236
237 *done = TRUE;
238
239 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
240 rtsp->CSeq_recv = 0;
241
242 /* Setup the first_* fields to allow auth details get sent
243 to this origin */
244
245 if(!data->state.first_host) {
246 data->state.first_host = strdup(conn->host.name);
247 if(!data->state.first_host)
248 return CURLE_OUT_OF_MEMORY;
249
250 data->state.first_remote_port = conn->remote_port;
251 data->state.first_remote_protocol = conn->handler->protocol;
252 }
253
254 /* Setup the 'p_request' pointer to the proper p_request string
255 * Since all RTSP requests are included here, there is no need to
256 * support custom requests like HTTP.
257 **/
258 data->req.no_body = TRUE; /* most requests don't contain a body */
259 switch(rtspreq) {
260 default:
261 failf(data, "Got invalid RTSP request");
262 return CURLE_BAD_FUNCTION_ARGUMENT;
263 case RTSPREQ_OPTIONS:
264 p_request = "OPTIONS";
265 break;
266 case RTSPREQ_DESCRIBE:
267 p_request = "DESCRIBE";
268 data->req.no_body = FALSE;
269 break;
270 case RTSPREQ_ANNOUNCE:
271 p_request = "ANNOUNCE";
272 break;
273 case RTSPREQ_SETUP:
274 p_request = "SETUP";
275 break;
276 case RTSPREQ_PLAY:
277 p_request = "PLAY";
278 break;
279 case RTSPREQ_PAUSE:
280 p_request = "PAUSE";
281 break;
282 case RTSPREQ_TEARDOWN:
283 p_request = "TEARDOWN";
284 break;
285 case RTSPREQ_GET_PARAMETER:
286 /* GET_PARAMETER's no_body status is determined later */
287 p_request = "GET_PARAMETER";
288 data->req.no_body = FALSE;
289 break;
290 case RTSPREQ_SET_PARAMETER:
291 p_request = "SET_PARAMETER";
292 break;
293 case RTSPREQ_RECORD:
294 p_request = "RECORD";
295 break;
296 case RTSPREQ_RECEIVE:
297 p_request = "";
298 /* Treat interleaved RTP as body */
299 data->req.no_body = FALSE;
300 break;
301 case RTSPREQ_LAST:
302 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
303 return CURLE_BAD_FUNCTION_ARGUMENT;
304 }
305
306 if(rtspreq == RTSPREQ_RECEIVE) {
307 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
308
309 return result;
310 }
311
312 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
313 if(!p_session_id &&
314 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
315 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
316 p_request);
317 return CURLE_BAD_FUNCTION_ARGUMENT;
318 }
319
320 /* Stream URI. Default to server '*' if not specified */
321 if(data->set.str[STRING_RTSP_STREAM_URI]) {
322 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
323 }
324 else {
325 p_stream_uri = "*";
326 }
327
328 /* Transport Header for SETUP requests */
329 p_transport = Curl_checkheaders(data, STRCONST("Transport"));
330 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
331 /* New Transport: setting? */
332 if(data->set.str[STRING_RTSP_TRANSPORT]) {
333 Curl_safefree(data->state.aptr.rtsp_transport);
334
335 data->state.aptr.rtsp_transport =
336 aprintf("Transport: %s\r\n",
337 data->set.str[STRING_RTSP_TRANSPORT]);
338 if(!data->state.aptr.rtsp_transport)
339 return CURLE_OUT_OF_MEMORY;
340 }
341 else {
342 failf(data,
343 "Refusing to issue an RTSP SETUP without a Transport: header.");
344 return CURLE_BAD_FUNCTION_ARGUMENT;
345 }
346
347 p_transport = data->state.aptr.rtsp_transport;
348 }
349
350 /* Accept Headers for DESCRIBE requests */
351 if(rtspreq == RTSPREQ_DESCRIBE) {
352 /* Accept Header */
353 p_accept = Curl_checkheaders(data, STRCONST("Accept"))?
354 NULL:"Accept: application/sdp\r\n";
355
356 /* Accept-Encoding header */
357 if(!Curl_checkheaders(data, STRCONST("Accept-Encoding")) &&
358 data->set.str[STRING_ENCODING]) {
359 Curl_safefree(data->state.aptr.accept_encoding);
360 data->state.aptr.accept_encoding =
361 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
362
363 if(!data->state.aptr.accept_encoding)
364 return CURLE_OUT_OF_MEMORY;
365
366 p_accept_encoding = data->state.aptr.accept_encoding;
367 }
368 }
369
370 /* The User-Agent string might have been allocated in url.c already, because
371 it might have been used in the proxy connect, but if we have got a header
372 with the user-agent string specified, we erase the previously made string
373 here. */
374 if(Curl_checkheaders(data, STRCONST("User-Agent")) &&
375 data->state.aptr.uagent) {
376 Curl_safefree(data->state.aptr.uagent);
377 data->state.aptr.uagent = NULL;
378 }
379 else if(!Curl_checkheaders(data, STRCONST("User-Agent")) &&
380 data->set.str[STRING_USERAGENT]) {
381 p_uagent = data->state.aptr.uagent;
382 }
383
384 /* setup the authentication headers */
385 result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
386 p_stream_uri, FALSE);
387 if(result)
388 return result;
389
390 p_proxyuserpwd = data->state.aptr.proxyuserpwd;
391 p_userpwd = data->state.aptr.userpwd;
392
393 /* Referrer */
394 Curl_safefree(data->state.aptr.ref);
395 if(data->state.referer && !Curl_checkheaders(data, STRCONST("Referer")))
396 data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
397 else
398 data->state.aptr.ref = NULL;
399
400 p_referrer = data->state.aptr.ref;
401
402 /*
403 * Range Header
404 * Only applies to PLAY, PAUSE, RECORD
405 *
406 * Go ahead and use the Range stuff supplied for HTTP
407 */
408 if(data->state.use_range &&
409 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
410
411 /* Check to see if there is a range set in the custom headers */
412 if(!Curl_checkheaders(data, STRCONST("Range")) && data->state.range) {
413 Curl_safefree(data->state.aptr.rangeline);
414 data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
415 p_range = data->state.aptr.rangeline;
416 }
417 }
418
419 /*
420 * Sanity check the custom headers
421 */
422 if(Curl_checkheaders(data, STRCONST("CSeq"))) {
423 failf(data, "CSeq cannot be set as a custom header.");
424 return CURLE_RTSP_CSEQ_ERROR;
425 }
426 if(Curl_checkheaders(data, STRCONST("Session"))) {
427 failf(data, "Session ID cannot be set as a custom header.");
428 return CURLE_BAD_FUNCTION_ARGUMENT;
429 }
430
431 /* Initialize a dynamic send buffer */
432 Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
433
434 result =
435 Curl_dyn_addf(&req_buffer,
436 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
437 "CSeq: %ld\r\n", /* CSeq */
438 p_request, p_stream_uri, rtsp->CSeq_sent);
439 if(result)
440 return result;
441
442 /*
443 * Rather than do a normal alloc line, keep the session_id unformatted
444 * to make comparison easier
445 */
446 if(p_session_id) {
447 result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
448 if(result)
449 return result;
450 }
451
452 /*
453 * Shared HTTP-like options
454 */
455 result = Curl_dyn_addf(&req_buffer,
456 "%s" /* transport */
457 "%s" /* accept */
458 "%s" /* accept-encoding */
459 "%s" /* range */
460 "%s" /* referrer */
461 "%s" /* user-agent */
462 "%s" /* proxyuserpwd */
463 "%s" /* userpwd */
464 ,
465 p_transport ? p_transport : "",
466 p_accept ? p_accept : "",
467 p_accept_encoding ? p_accept_encoding : "",
468 p_range ? p_range : "",
469 p_referrer ? p_referrer : "",
470 p_uagent ? p_uagent : "",
471 p_proxyuserpwd ? p_proxyuserpwd : "",
472 p_userpwd ? p_userpwd : "");
473
474 /*
475 * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
476 * with basic and digest, it will be freed anyway by the next request
477 */
478 Curl_safefree(data->state.aptr.userpwd);
479 data->state.aptr.userpwd = NULL;
480
481 if(result)
482 return result;
483
484 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
485 result = Curl_add_timecondition(data, &req_buffer);
486 if(result)
487 return result;
488 }
489
490 result = Curl_add_custom_headers(data, FALSE, &req_buffer);
491 if(result)
492 return result;
493
494 if(rtspreq == RTSPREQ_ANNOUNCE ||
495 rtspreq == RTSPREQ_SET_PARAMETER ||
496 rtspreq == RTSPREQ_GET_PARAMETER) {
497
498 if(data->set.upload) {
499 putsize = data->state.infilesize;
500 data->state.httpreq = HTTPREQ_PUT;
501
502 }
503 else {
504 postsize = (data->state.infilesize != -1)?
505 data->state.infilesize:
506 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
507 data->state.httpreq = HTTPREQ_POST;
508 }
509
510 if(putsize > 0 || postsize > 0) {
511 /* As stated in the http comments, it is probably not wise to
512 * actually set a custom Content-Length in the headers */
513 if(!Curl_checkheaders(data, STRCONST("Content-Length"))) {
514 result =
515 Curl_dyn_addf(&req_buffer,
516 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
517 (data->set.upload ? putsize : postsize));
518 if(result)
519 return result;
520 }
521
522 if(rtspreq == RTSPREQ_SET_PARAMETER ||
523 rtspreq == RTSPREQ_GET_PARAMETER) {
524 if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
525 result = Curl_dyn_addn(&req_buffer,
526 STRCONST("Content-Type: "
527 "text/parameters\r\n"));
528 if(result)
529 return result;
530 }
531 }
532
533 if(rtspreq == RTSPREQ_ANNOUNCE) {
534 if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
535 result = Curl_dyn_addn(&req_buffer,
536 STRCONST("Content-Type: "
537 "application/sdp\r\n"));
538 if(result)
539 return result;
540 }
541 }
542
543 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
544 }
545 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
546 /* Check for an empty GET_PARAMETER (heartbeat) request */
547 data->state.httpreq = HTTPREQ_HEAD;
548 data->req.no_body = TRUE;
549 }
550 }
551
552 /* RTSP never allows chunked transfer */
553 data->req.forbidchunk = TRUE;
554 /* Finish the request buffer */
555 result = Curl_dyn_addn(&req_buffer, STRCONST("\r\n"));
556 if(result)
557 return result;
558
559 if(postsize > 0) {
560 result = Curl_dyn_addn(&req_buffer, data->set.postfields,
561 (size_t)postsize);
562 if(result)
563 return result;
564 }
565
566 /* issue the request */
567 result = Curl_buffer_send(&req_buffer, data, data->req.p.http,
568 &data->info.request_size, 0, FIRSTSOCKET);
569 if(result) {
570 failf(data, "Failed sending RTSP request");
571 return result;
572 }
573
574 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
575
576 /* Increment the CSeq on success */
577 data->state.rtsp_next_client_CSeq++;
578
579 if(data->req.writebytecount) {
580 /* if a request-body has been sent off, we make sure this progress is
581 noted properly */
582 Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
583 if(Curl_pgrsUpdate(data))
584 result = CURLE_ABORTED_BY_CALLBACK;
585 }
586
587 return result;
588 }
589
590
rtsp_rtp_readwrite(struct Curl_easy * data,struct connectdata * conn,ssize_t * nread,bool * readmore)591 static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
592 struct connectdata *conn,
593 ssize_t *nread,
594 bool *readmore) {
595 struct SingleRequest *k = &data->req;
596 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
597
598 char *rtp; /* moving pointer to rtp data */
599 ssize_t rtp_dataleft; /* how much data left to parse in this round */
600 char *scratch;
601 CURLcode result;
602
603 if(rtspc->rtp_buf) {
604 /* There was some leftover data the last time. Merge buffers */
605 char *newptr = Curl_saferealloc(rtspc->rtp_buf,
606 rtspc->rtp_bufsize + *nread);
607 if(!newptr) {
608 rtspc->rtp_buf = NULL;
609 rtspc->rtp_bufsize = 0;
610 return CURLE_OUT_OF_MEMORY;
611 }
612 rtspc->rtp_buf = newptr;
613 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
614 rtspc->rtp_bufsize += *nread;
615 rtp = rtspc->rtp_buf;
616 rtp_dataleft = rtspc->rtp_bufsize;
617 }
618 else {
619 /* Just parse the request buffer directly */
620 rtp = k->str;
621 rtp_dataleft = *nread;
622 }
623
624 while((rtp_dataleft > 0) &&
625 (rtp[0] == '$')) {
626 if(rtp_dataleft > 4) {
627 int rtp_length;
628
629 /* Parse the header */
630 /* The channel identifier immediately follows and is 1 byte */
631 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
632
633 /* The length is two bytes */
634 rtp_length = RTP_PKT_LENGTH(rtp);
635
636 if(rtp_dataleft < rtp_length + 4) {
637 /* Need more - incomplete payload */
638 *readmore = TRUE;
639 break;
640 }
641 /* We have the full RTP interleaved packet
642 * Write out the header including the leading '$' */
643 DEBUGF(infof(data, "RTP write channel %d rtp_length %d",
644 rtspc->rtp_channel, rtp_length));
645 result = rtp_client_write(data, &rtp[0], rtp_length + 4);
646 if(result) {
647 failf(data, "Got an error writing an RTP packet");
648 *readmore = FALSE;
649 Curl_safefree(rtspc->rtp_buf);
650 rtspc->rtp_buf = NULL;
651 rtspc->rtp_bufsize = 0;
652 return result;
653 }
654
655 /* Move forward in the buffer */
656 rtp_dataleft -= rtp_length + 4;
657 rtp += rtp_length + 4;
658
659 if(data->set.rtspreq == RTSPREQ_RECEIVE) {
660 /* If we are in a passive receive, give control back
661 * to the app as often as we can.
662 */
663 k->keepon &= ~KEEP_RECV;
664 }
665 }
666 else {
667 /* Need more - incomplete header */
668 *readmore = TRUE;
669 break;
670 }
671 }
672
673 if(rtp_dataleft && rtp[0] == '$') {
674 DEBUGF(infof(data, "RTP Rewinding %zd %s", rtp_dataleft,
675 *readmore ? "(READMORE)" : ""));
676
677 /* Store the incomplete RTP packet for a "rewind" */
678 scratch = malloc(rtp_dataleft);
679 if(!scratch) {
680 Curl_safefree(rtspc->rtp_buf);
681 rtspc->rtp_buf = NULL;
682 rtspc->rtp_bufsize = 0;
683 return CURLE_OUT_OF_MEMORY;
684 }
685 memcpy(scratch, rtp, rtp_dataleft);
686 Curl_safefree(rtspc->rtp_buf);
687 rtspc->rtp_buf = scratch;
688 rtspc->rtp_bufsize = rtp_dataleft;
689
690 /* As far as the transfer is concerned, this data is consumed */
691 *nread = 0;
692 return CURLE_OK;
693 }
694 /* Fix up k->str to point just after the last RTP packet */
695 k->str += *nread - rtp_dataleft;
696
697 /* either all of the data has been read or...
698 * rtp now points at the next byte to parse
699 */
700 if(rtp_dataleft > 0)
701 DEBUGASSERT(k->str[0] == rtp[0]);
702
703 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
704
705 *nread = rtp_dataleft;
706
707 /* If we get here, we have finished with the leftover/merge buffer */
708 Curl_safefree(rtspc->rtp_buf);
709 rtspc->rtp_buf = NULL;
710 rtspc->rtp_bufsize = 0;
711
712 return CURLE_OK;
713 }
714
715 static
rtp_client_write(struct Curl_easy * data,char * ptr,size_t len)716 CURLcode rtp_client_write(struct Curl_easy *data, char *ptr, size_t len)
717 {
718 size_t wrote;
719 curl_write_callback writeit;
720 void *user_ptr;
721
722 if(len == 0) {
723 failf(data, "Cannot write a 0 size RTP packet.");
724 return CURLE_WRITE_ERROR;
725 }
726
727 /* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
728 function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
729 data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
730 pointer to write out the RTP data. */
731 if(data->set.fwrite_rtp) {
732 writeit = data->set.fwrite_rtp;
733 user_ptr = data->set.rtp_out;
734 }
735 else {
736 writeit = data->set.fwrite_func;
737 user_ptr = data->set.out;
738 }
739
740 Curl_set_in_callback(data, true);
741 wrote = writeit(ptr, 1, len, user_ptr);
742 Curl_set_in_callback(data, false);
743
744 if(CURL_WRITEFUNC_PAUSE == wrote) {
745 failf(data, "Cannot pause RTP");
746 return CURLE_WRITE_ERROR;
747 }
748
749 if(wrote != len) {
750 failf(data, "Failed writing RTP data");
751 return CURLE_WRITE_ERROR;
752 }
753
754 return CURLE_OK;
755 }
756
Curl_rtsp_parseheader(struct Curl_easy * data,char * header)757 CURLcode Curl_rtsp_parseheader(struct Curl_easy *data, char *header)
758 {
759 if(checkprefix("CSeq:", header)) {
760 long CSeq = 0;
761 char *endp;
762 char *p = &header[5];
763 while(ISBLANK(*p))
764 p++;
765 CSeq = strtol(p, &endp, 10);
766 if(p != endp) {
767 struct RTSP *rtsp = data->req.p.rtsp;
768 rtsp->CSeq_recv = CSeq; /* mark the request */
769 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
770 }
771 else {
772 failf(data, "Unable to read the CSeq header: [%s]", header);
773 return CURLE_RTSP_CSEQ_ERROR;
774 }
775 }
776 else if(checkprefix("Session:", header)) {
777 char *start;
778 char *end;
779 size_t idlen;
780
781 /* Find the first non-space letter */
782 start = header + 8;
783 while(*start && ISBLANK(*start))
784 start++;
785
786 if(!*start) {
787 failf(data, "Got a blank Session ID");
788 return CURLE_RTSP_SESSION_ERROR;
789 }
790
791 /* Find the end of Session ID
792 *
793 * Allow any non whitespace content, up to the field separator or end of
794 * line. RFC 2326 isn't 100% clear on the session ID and for example
795 * gstreamer does url-encoded session ID's not covered by the standard.
796 */
797 end = start;
798 while(*end && *end != ';' && !ISSPACE(*end))
799 end++;
800 idlen = end - start;
801
802 if(data->set.str[STRING_RTSP_SESSION_ID]) {
803
804 /* If the Session ID is set, then compare */
805 if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen ||
806 strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen) != 0) {
807 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
808 start, data->set.str[STRING_RTSP_SESSION_ID]);
809 return CURLE_RTSP_SESSION_ERROR;
810 }
811 }
812 else {
813 /* If the Session ID is not set, and we find it in a response, then set
814 * it.
815 */
816
817 /* Copy the id substring into a new buffer */
818 data->set.str[STRING_RTSP_SESSION_ID] = malloc(idlen + 1);
819 if(!data->set.str[STRING_RTSP_SESSION_ID])
820 return CURLE_OUT_OF_MEMORY;
821 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, idlen);
822 (data->set.str[STRING_RTSP_SESSION_ID])[idlen] = '\0';
823 }
824 }
825 return CURLE_OK;
826 }
827
828 #endif /* CURL_DISABLE_RTSP or using Hyper */
829