1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, 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 ***************************************************************************/
22
23#include "curl_setup.h"
24
25#if !defined(CURL_DISABLE_RTSP) && !defined(USE_HYPER)
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 */
51static CURLcode rtsp_do(struct Curl_easy *data, bool *done);
52static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
53static CURLcode rtsp_connect(struct Curl_easy *data, bool *done);
54static CURLcode rtsp_disconnect(struct Curl_easy *data,
55 struct connectdata *conn, bool dead);
56static int rtsp_getsock_do(struct Curl_easy *data,
57 struct connectdata *conn, curl_socket_t *socks);
58
59/*
60 * Parse and write out any available RTP data.
61 *
62 * nread: amount of data left after k->str. will be modified if RTP
63 * data is parsed and k->str is moved up
64 * readmore: whether or not the RTP parser needs more data right away
65 */
66static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
67 struct connectdata *conn,
68 ssize_t *nread,
69 bool *readmore);
70
71static CURLcode rtsp_setup_connection(struct Curl_easy *data,
72 struct connectdata *conn);
73static unsigned int rtsp_conncheck(struct Curl_easy *data,
74 struct connectdata *check,
75 unsigned int checks_to_perform);
76
77/* this returns the socket to wait for in the DO and DOING state for the multi
78 interface and then we're always _sending_ a request and thus we wait for
79 the single socket to become writable only */
80static int rtsp_getsock_do(struct Curl_easy *data, struct connectdata *conn,
81 curl_socket_t *socks)
82{
83 /* write mode */
84 (void)data;
85 socks[0] = conn->sock[FIRSTSOCKET];
86 return GETSOCK_WRITESOCK(0);
87}
88
89static
90CURLcode rtp_client_write(struct Curl_easy *data, char *ptr, size_t len);
91
92
93/*
94 * RTSP handler interface.
95 */
96const struct Curl_handler Curl_handler_rtsp = {
97 "RTSP", /* scheme */
98 rtsp_setup_connection, /* setup_connection */
99 rtsp_do, /* do_it */
100 rtsp_done, /* done */
101 ZERO_NULL, /* do_more */
102 rtsp_connect, /* connect_it */
103 ZERO_NULL, /* connecting */
104 ZERO_NULL, /* doing */
105 ZERO_NULL, /* proto_getsock */
106 rtsp_getsock_do, /* doing_getsock */
107 ZERO_NULL, /* domore_getsock */
108 ZERO_NULL, /* perform_getsock */
109 rtsp_disconnect, /* disconnect */
110 rtsp_rtp_readwrite, /* readwrite */
111 rtsp_conncheck, /* connection_check */
112 ZERO_NULL, /* attach connection */
113 PORT_RTSP, /* defport */
114 CURLPROTO_RTSP, /* protocol */
115 CURLPROTO_RTSP, /* family */
116 PROTOPT_NONE /* flags */
117};
118
119
120static CURLcode rtsp_setup_connection(struct Curl_easy *data,
121 struct connectdata *conn)
122{
123 struct RTSP *rtsp;
124 (void)conn;
125
126 data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
127 if(!rtsp)
128 return CURLE_OUT_OF_MEMORY;
129
130 return CURLE_OK;
131}
132
133
134/*
135 * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not
136 * want to block the application forever while receiving a stream. Therefore,
137 * we cannot assume that an RTSP socket is dead just because it is readable.
138 *
139 * Instead, if it is readable, run Curl_connalive() to peek at the socket
140 * and distinguish between closed and data.
141 */
142static bool rtsp_connisdead(struct connectdata *check)
143{
144 int sval;
145 bool ret_val = TRUE;
146
147 sval = SOCKET_READABLE(check->sock[FIRSTSOCKET], 0);
148 if(sval == 0) {
149 /* timeout */
150 ret_val = FALSE;
151 }
152 else if(sval & CURL_CSELECT_ERR) {
153 /* socket is in an error state */
154 ret_val = TRUE;
155 }
156 else if(sval & CURL_CSELECT_IN) {
157 /* readable with no error. could still be closed */
158 ret_val = !Curl_connalive(check);
159 }
160
161 return ret_val;
162}
163
164/*
165 * Function to check on various aspects of a connection.
166 */
167static unsigned int rtsp_conncheck(struct Curl_easy *data,
168 struct connectdata *conn,
169 unsigned int checks_to_perform)
170{
171 unsigned int ret_val = CONNRESULT_NONE;
172 (void)data;
173
174 if(checks_to_perform & CONNCHECK_ISDEAD) {
175 if(rtsp_connisdead(conn))
176 ret_val |= CONNRESULT_DEAD;
177 }
178
179 return ret_val;
180}
181
182
183static CURLcode rtsp_connect(struct Curl_easy *data, bool *done)
184{
185 CURLcode httpStatus;
186
187 httpStatus = Curl_http_connect(data, done);
188
189 /* Initialize the CSeq if not already done */
190 if(data->state.rtsp_next_client_CSeq == 0)
191 data->state.rtsp_next_client_CSeq = 1;
192 if(data->state.rtsp_next_server_CSeq == 0)
193 data->state.rtsp_next_server_CSeq = 1;
194
195 data->conn->proto.rtspc.rtp_channel = -1;
196
197 return httpStatus;
198}
199
200static CURLcode rtsp_disconnect(struct Curl_easy *data,
201 struct connectdata *conn, bool dead)
202{
203 (void) dead;
204 (void) data;
205 Curl_safefree(conn->proto.rtspc.rtp_buf);
206 return CURLE_OK;
207}
208
209
210static CURLcode rtsp_done(struct Curl_easy *data,
211 CURLcode status, bool premature)
212{
213 struct RTSP *rtsp = data->req.p.rtsp;
214 CURLcode httpStatus;
215
216 /* Bypass HTTP empty-reply checks on receive */
217 if(data->set.rtspreq == RTSPREQ_RECEIVE)
218 premature = TRUE;
219
220 httpStatus = Curl_http_done(data, status, premature);
221
222 if(rtsp) {
223 /* Check the sequence numbers */
224 long CSeq_sent = rtsp->CSeq_sent;
225 long CSeq_recv = rtsp->CSeq_recv;
226 if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) {
227 failf(data,
228 "The CSeq of this request %ld did not match the response %ld",
229 CSeq_sent, CSeq_recv);
230 return CURLE_RTSP_CSEQ_ERROR;
231 }
232 if(data->set.rtspreq == RTSPREQ_RECEIVE &&
233 (data->conn->proto.rtspc.rtp_channel == -1)) {
234 infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
235 }
236 }
237
238 return httpStatus;
239}
240
241static CURLcode rtsp_do(struct Curl_easy *data, bool *done)
242{
243 struct connectdata *conn = data->conn;
244 CURLcode result = CURLE_OK;
245 Curl_RtspReq rtspreq = data->set.rtspreq;
246 struct RTSP *rtsp = data->req.p.rtsp;
247 struct dynbuf req_buffer;
248 curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */
249 curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */
250
251 const char *p_request = NULL;
252 const char *p_session_id = NULL;
253 const char *p_accept = NULL;
254 const char *p_accept_encoding = NULL;
255 const char *p_range = NULL;
256 const char *p_referrer = NULL;
257 const char *p_stream_uri = NULL;
258 const char *p_transport = NULL;
259 const char *p_uagent = NULL;
260 const char *p_proxyuserpwd = NULL;
261 const char *p_userpwd = NULL;
262
263 *done = TRUE;
264
265 rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
266 rtsp->CSeq_recv = 0;
267
268 /* Setup the 'p_request' pointer to the proper p_request string
269 * Since all RTSP requests are included here, there is no need to
270 * support custom requests like HTTP.
271 **/
272 data->set.opt_no_body = TRUE; /* most requests don't contain a body */
273 switch(rtspreq) {
274 default:
275 failf(data, "Got invalid RTSP request");
276 return CURLE_BAD_FUNCTION_ARGUMENT;
277 case RTSPREQ_OPTIONS:
278 p_request = "OPTIONS";
279 break;
280 case RTSPREQ_DESCRIBE:
281 p_request = "DESCRIBE";
282 data->set.opt_no_body = FALSE;
283 break;
284 case RTSPREQ_ANNOUNCE:
285 p_request = "ANNOUNCE";
286 break;
287 case RTSPREQ_SETUP:
288 p_request = "SETUP";
289 break;
290 case RTSPREQ_PLAY:
291 p_request = "PLAY";
292 break;
293 case RTSPREQ_PAUSE:
294 p_request = "PAUSE";
295 break;
296 case RTSPREQ_TEARDOWN:
297 p_request = "TEARDOWN";
298 break;
299 case RTSPREQ_GET_PARAMETER:
300 /* GET_PARAMETER's no_body status is determined later */
301 p_request = "GET_PARAMETER";
302 data->set.opt_no_body = FALSE;
303 break;
304 case RTSPREQ_SET_PARAMETER:
305 p_request = "SET_PARAMETER";
306 break;
307 case RTSPREQ_RECORD:
308 p_request = "RECORD";
309 break;
310 case RTSPREQ_RECEIVE:
311 p_request = "";
312 /* Treat interleaved RTP as body*/
313 data->set.opt_no_body = FALSE;
314 break;
315 case RTSPREQ_LAST:
316 failf(data, "Got invalid RTSP request: RTSPREQ_LAST");
317 return CURLE_BAD_FUNCTION_ARGUMENT;
318 }
319
320 if(rtspreq == RTSPREQ_RECEIVE) {
321 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, -1);
322
323 return result;
324 }
325
326 p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
327 if(!p_session_id &&
328 (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) {
329 failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
330 p_request);
331 return CURLE_BAD_FUNCTION_ARGUMENT;
332 }
333
334 /* Stream URI. Default to server '*' if not specified */
335 if(data->set.str[STRING_RTSP_STREAM_URI]) {
336 p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI];
337 }
338 else {
339 p_stream_uri = "*";
340 }
341
342 /* Transport Header for SETUP requests */
343 p_transport = Curl_checkheaders(data, "Transport");
344 if(rtspreq == RTSPREQ_SETUP && !p_transport) {
345 /* New Transport: setting? */
346 if(data->set.str[STRING_RTSP_TRANSPORT]) {
347 Curl_safefree(data->state.aptr.rtsp_transport);
348
349 data->state.aptr.rtsp_transport =
350 aprintf("Transport: %s\r\n",
351 data->set.str[STRING_RTSP_TRANSPORT]);
352 if(!data->state.aptr.rtsp_transport)
353 return CURLE_OUT_OF_MEMORY;
354 }
355 else {
356 failf(data,
357 "Refusing to issue an RTSP SETUP without a Transport: header.");
358 return CURLE_BAD_FUNCTION_ARGUMENT;
359 }
360
361 p_transport = data->state.aptr.rtsp_transport;
362 }
363
364 /* Accept Headers for DESCRIBE requests */
365 if(rtspreq == RTSPREQ_DESCRIBE) {
366 /* Accept Header */
367 p_accept = Curl_checkheaders(data, "Accept")?
368 NULL:"Accept: application/sdp\r\n";
369
370 /* Accept-Encoding header */
371 if(!Curl_checkheaders(data, "Accept-Encoding") &&
372 data->set.str[STRING_ENCODING]) {
373 Curl_safefree(data->state.aptr.accept_encoding);
374 data->state.aptr.accept_encoding =
375 aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
376
377 if(!data->state.aptr.accept_encoding)
378 return CURLE_OUT_OF_MEMORY;
379
380 p_accept_encoding = data->state.aptr.accept_encoding;
381 }
382 }
383
384 /* The User-Agent string might have been allocated in url.c already, because
385 it might have been used in the proxy connect, but if we have got a header
386 with the user-agent string specified, we erase the previously made string
387 here. */
388 if(Curl_checkheaders(data, "User-Agent") && data->state.aptr.uagent) {
389 Curl_safefree(data->state.aptr.uagent);
390 data->state.aptr.uagent = NULL;
391 }
392 else if(!Curl_checkheaders(data, "User-Agent") &&
393 data->set.str[STRING_USERAGENT]) {
394 p_uagent = data->state.aptr.uagent;
395 }
396
397 /* setup the authentication headers */
398 result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
399 p_stream_uri, FALSE);
400 if(result)
401 return result;
402
403 p_proxyuserpwd = data->state.aptr.proxyuserpwd;
404 p_userpwd = data->state.aptr.userpwd;
405
406 /* Referrer */
407 Curl_safefree(data->state.aptr.ref);
408 if(data->state.referer && !Curl_checkheaders(data, "Referer"))
409 data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
410 else
411 data->state.aptr.ref = NULL;
412
413 p_referrer = data->state.aptr.ref;
414
415 /*
416 * Range Header
417 * Only applies to PLAY, PAUSE, RECORD
418 *
419 * Go ahead and use the Range stuff supplied for HTTP
420 */
421 if(data->state.use_range &&
422 (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) {
423
424 /* Check to see if there is a range set in the custom headers */
425 if(!Curl_checkheaders(data, "Range") && data->state.range) {
426 Curl_safefree(data->state.aptr.rangeline);
427 data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
428 p_range = data->state.aptr.rangeline;
429 }
430 }
431
432 /*
433 * Sanity check the custom headers
434 */
435 if(Curl_checkheaders(data, "CSeq")) {
436 failf(data, "CSeq cannot be set as a custom header.");
437 return CURLE_RTSP_CSEQ_ERROR;
438 }
439 if(Curl_checkheaders(data, "Session")) {
440 failf(data, "Session ID cannot be set as a custom header.");
441 return CURLE_BAD_FUNCTION_ARGUMENT;
442 }
443
444 /* Initialize a dynamic send buffer */
445 Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
446
447 result =
448 Curl_dyn_addf(&req_buffer,
449 "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
450 "CSeq: %ld\r\n", /* CSeq */
451 p_request, p_stream_uri, rtsp->CSeq_sent);
452 if(result)
453 return result;
454
455 /*
456 * Rather than do a normal alloc line, keep the session_id unformatted
457 * to make comparison easier
458 */
459 if(p_session_id) {
460 result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
461 if(result)
462 return result;
463 }
464
465 /*
466 * Shared HTTP-like options
467 */
468 result = Curl_dyn_addf(&req_buffer,
469 "%s" /* transport */
470 "%s" /* accept */
471 "%s" /* accept-encoding */
472 "%s" /* range */
473 "%s" /* referrer */
474 "%s" /* user-agent */
475 "%s" /* proxyuserpwd */
476 "%s" /* userpwd */
477 ,
478 p_transport ? p_transport : "",
479 p_accept ? p_accept : "",
480 p_accept_encoding ? p_accept_encoding : "",
481 p_range ? p_range : "",
482 p_referrer ? p_referrer : "",
483 p_uagent ? p_uagent : "",
484 p_proxyuserpwd ? p_proxyuserpwd : "",
485 p_userpwd ? p_userpwd : "");
486
487 /*
488 * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
489 * with basic and digest, it will be freed anyway by the next request
490 */
491 Curl_safefree(data->state.aptr.userpwd);
492 data->state.aptr.userpwd = NULL;
493
494 if(result)
495 return result;
496
497 if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
498 result = Curl_add_timecondition(data, &req_buffer);
499 if(result)
500 return result;
501 }
502
503 result = Curl_add_custom_headers(data, FALSE, &req_buffer);
504 if(result)
505 return result;
506
507 if(rtspreq == RTSPREQ_ANNOUNCE ||
508 rtspreq == RTSPREQ_SET_PARAMETER ||
509 rtspreq == RTSPREQ_GET_PARAMETER) {
510
511 if(data->set.upload) {
512 putsize = data->state.infilesize;
513 data->state.httpreq = HTTPREQ_PUT;
514
515 }
516 else {
517 postsize = (data->state.infilesize != -1)?
518 data->state.infilesize:
519 (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0);
520 data->state.httpreq = HTTPREQ_POST;
521 }
522
523 if(putsize > 0 || postsize > 0) {
524 /* As stated in the http comments, it is probably not wise to
525 * actually set a custom Content-Length in the headers */
526 if(!Curl_checkheaders(data, "Content-Length")) {
527 result =
528 Curl_dyn_addf(&req_buffer,
529 "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
530 (data->set.upload ? putsize : postsize));
531 if(result)
532 return result;
533 }
534
535 if(rtspreq == RTSPREQ_SET_PARAMETER ||
536 rtspreq == RTSPREQ_GET_PARAMETER) {
537 if(!Curl_checkheaders(data, "Content-Type")) {
538 result = Curl_dyn_addf(&req_buffer,
539 "Content-Type: text/parameters\r\n");
540 if(result)
541 return result;
542 }
543 }
544
545 if(rtspreq == RTSPREQ_ANNOUNCE) {
546 if(!Curl_checkheaders(data, "Content-Type")) {
547 result = Curl_dyn_addf(&req_buffer,
548 "Content-Type: application/sdp\r\n");
549 if(result)
550 return result;
551 }
552 }
553
554 data->state.expect100header = FALSE; /* RTSP posts are simple/small */
555 }
556 else if(rtspreq == RTSPREQ_GET_PARAMETER) {
557 /* Check for an empty GET_PARAMETER (heartbeat) request */
558 data->state.httpreq = HTTPREQ_HEAD;
559 data->set.opt_no_body = TRUE;
560 }
561 }
562
563 /* RTSP never allows chunked transfer */
564 data->req.forbidchunk = TRUE;
565 /* Finish the request buffer */
566 result = Curl_dyn_add(&req_buffer, "\r\n");
567 if(result)
568 return result;
569
570 if(postsize > 0) {
571 result = Curl_dyn_addn(&req_buffer, data->set.postfields,
572 (size_t)postsize);
573 if(result)
574 return result;
575 }
576
577 /* issue the request */
578 result = Curl_buffer_send(&req_buffer, data,
579 &data->info.request_size, 0, FIRSTSOCKET);
580 if(result) {
581 failf(data, "Failed sending RTSP request");
582 return result;
583 }
584
585 Curl_setup_transfer(data, FIRSTSOCKET, -1, TRUE, putsize?FIRSTSOCKET:-1);
586
587 /* Increment the CSeq on success */
588 data->state.rtsp_next_client_CSeq++;
589
590 if(data->req.writebytecount) {
591 /* if a request-body has been sent off, we make sure this progress is
592 noted properly */
593 Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
594 if(Curl_pgrsUpdate(data))
595 result = CURLE_ABORTED_BY_CALLBACK;
596 }
597
598 return result;
599}
600
601
602static CURLcode rtsp_rtp_readwrite(struct Curl_easy *data,
603 struct connectdata *conn,
604 ssize_t *nread,
605 bool *readmore) {
606 struct SingleRequest *k = &data->req;
607 struct rtsp_conn *rtspc = &(conn->proto.rtspc);
608
609 char *rtp; /* moving pointer to rtp data */
610 ssize_t rtp_dataleft; /* how much data left to parse in this round */
611 char *scratch;
612 CURLcode result;
613
614 if(rtspc->rtp_buf) {
615 /* There was some leftover data the last time. Merge buffers */
616 char *newptr = Curl_saferealloc(rtspc->rtp_buf,
617 rtspc->rtp_bufsize + *nread);
618 if(!newptr) {
619 rtspc->rtp_buf = NULL;
620 rtspc->rtp_bufsize = 0;
621 return CURLE_OUT_OF_MEMORY;
622 }
623 rtspc->rtp_buf = newptr;
624 memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread);
625 rtspc->rtp_bufsize += *nread;
626 rtp = rtspc->rtp_buf;
627 rtp_dataleft = rtspc->rtp_bufsize;
628 }
629 else {
630 /* Just parse the request buffer directly */
631 rtp = k->str;
632 rtp_dataleft = *nread;
633 }
634
635 while((rtp_dataleft > 0) &&
636 (rtp[0] == '$')) {
637 if(rtp_dataleft > 4) {
638 int rtp_length;
639
640 /* Parse the header */
641 /* The channel identifier immediately follows and is 1 byte */
642 rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp);
643
644 /* The length is two bytes */
645 rtp_length = RTP_PKT_LENGTH(rtp);
646
647 if(rtp_dataleft < rtp_length + 4) {
648 /* Need more - incomplete payload*/
649 *readmore = TRUE;
650 break;
651 }
652 /* We have the full RTP interleaved packet
653 * Write out the header including the leading '$' */
654 DEBUGF(infof(data, "RTP write channel %d rtp_length %d",
655 rtspc->rtp_channel, rtp_length));
656 result = rtp_client_write(data, &rtp[0], rtp_length + 4);
657 if(result) {
658 failf(data, "Got an error writing an RTP packet");
659 *readmore = FALSE;
660 Curl_safefree(rtspc->rtp_buf);
661 rtspc->rtp_buf = NULL;
662 rtspc->rtp_bufsize = 0;
663 return result;
664 }
665
666 /* Move forward in the buffer */
667 rtp_dataleft -= rtp_length + 4;
668 rtp += rtp_length + 4;
669
670 if(data->set.rtspreq == RTSPREQ_RECEIVE) {
671 /* If we are in a passive receive, give control back
672 * to the app as often as we can.
673 */
674 k->keepon &= ~KEEP_RECV;
675 }
676 }
677 else {
678 /* Need more - incomplete header */
679 *readmore = TRUE;
680 break;
681 }
682 }
683
684 if(rtp_dataleft && rtp[0] == '$') {
685 DEBUGF(infof(data, "RTP Rewinding %zd %s", rtp_dataleft,
686 *readmore ? "(READMORE)" : ""));
687
688 /* Store the incomplete RTP packet for a "rewind" */
689 scratch = malloc(rtp_dataleft);
690 if(!scratch) {
691 Curl_safefree(rtspc->rtp_buf);
692 rtspc->rtp_buf = NULL;
693 rtspc->rtp_bufsize = 0;
694 return CURLE_OUT_OF_MEMORY;
695 }
696 memcpy(scratch, rtp, rtp_dataleft);
697 Curl_safefree(rtspc->rtp_buf);
698 rtspc->rtp_buf = scratch;
699 rtspc->rtp_bufsize = rtp_dataleft;
700
701 /* As far as the transfer is concerned, this data is consumed */
702 *nread = 0;
703 return CURLE_OK;
704 }
705 /* Fix up k->str to point just after the last RTP packet */
706 k->str += *nread - rtp_dataleft;
707
708 /* either all of the data has been read or...
709 * rtp now points at the next byte to parse
710 */
711 if(rtp_dataleft > 0)
712 DEBUGASSERT(k->str[0] == rtp[0]);
713
714 DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */
715
716 *nread = rtp_dataleft;
717
718 /* If we get here, we have finished with the leftover/merge buffer */
719 Curl_safefree(rtspc->rtp_buf);
720 rtspc->rtp_buf = NULL;
721 rtspc->rtp_bufsize = 0;
722
723 return CURLE_OK;
724}
725
726static
727CURLcode rtp_client_write(struct Curl_easy *data, char *ptr, size_t len)
728{
729 size_t wrote;
730 curl_write_callback writeit;
731 void *user_ptr;
732
733 if(len == 0) {
734 failf(data, "Cannot write a 0 size RTP packet.");
735 return CURLE_WRITE_ERROR;
736 }
737
738 /* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
739 function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
740 data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
741 pointer to write out the RTP data. */
742 if(data->set.fwrite_rtp) {
743 writeit = data->set.fwrite_rtp;
744 user_ptr = data->set.rtp_out;
745 }
746 else {
747 writeit = data->set.fwrite_func;
748 user_ptr = data->set.out;
749 }
750
751 Curl_set_in_callback(data, true);
752 wrote = writeit(ptr, 1, len, user_ptr);
753 Curl_set_in_callback(data, false);
754
755 if(CURL_WRITEFUNC_PAUSE == wrote) {
756 failf(data, "Cannot pause RTP");
757 return CURLE_WRITE_ERROR;
758 }
759
760 if(wrote != len) {
761 failf(data, "Failed writing RTP data");
762 return CURLE_WRITE_ERROR;
763 }
764
765 return CURLE_OK;
766}
767
768CURLcode Curl_rtsp_parseheader(struct Curl_easy *data, char *header)
769{
770 long CSeq = 0;
771
772 if(checkprefix("CSeq:", header)) {
773 /* Store the received CSeq. Match is verified in rtsp_done */
774 int nc = sscanf(&header[4], ": %ld", &CSeq);
775 if(nc == 1) {
776 struct RTSP *rtsp = data->req.p.rtsp;
777 rtsp->CSeq_recv = CSeq; /* mark the request */
778 data->state.rtsp_CSeq_recv = CSeq; /* update the handle */
779 }
780 else {
781 failf(data, "Unable to read the CSeq header: [%s]", header);
782 return CURLE_RTSP_CSEQ_ERROR;
783 }
784 }
785 else if(checkprefix("Session:", header)) {
786 char *start;
787 char *end;
788 size_t idlen;
789
790 /* Find the first non-space letter */
791 start = header + 8;
792 while(*start && ISSPACE(*start))
793 start++;
794
795 if(!*start) {
796 failf(data, "Got a blank Session ID");
797 return CURLE_RTSP_SESSION_ERROR;
798 }
799
800 /* Find the end of Session ID
801 *
802 * Allow any non whitespace content, up to the field separator or end of
803 * line. RFC 2326 isn't 100% clear on the session ID and for example
804 * gstreamer does url-encoded session ID's not covered by the standard.
805 */
806 end = start;
807 while(*end && *end != ';' && !ISSPACE(*end))
808 end++;
809 idlen = end - start;
810
811 if(data->set.str[STRING_RTSP_SESSION_ID]) {
812
813 /* If the Session ID is set, then compare */
814 if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen ||
815 strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen) != 0) {
816 failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]",
817 start, data->set.str[STRING_RTSP_SESSION_ID]);
818 return CURLE_RTSP_SESSION_ERROR;
819 }
820 }
821 else {
822 /* If the Session ID is not set, and we find it in a response, then set
823 * it.
824 */
825
826 /* Copy the id substring into a new buffer */
827 data->set.str[STRING_RTSP_SESSION_ID] = malloc(idlen + 1);
828 if(!data->set.str[STRING_RTSP_SESSION_ID])
829 return CURLE_OUT_OF_MEMORY;
830 memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, idlen);
831 (data->set.str[STRING_RTSP_SESSION_ID])[idlen] = '\0';
832 }
833 }
834 return CURLE_OK;
835}
836
837#endif /* CURL_DISABLE_RTSP or using Hyper */
838