summaryrefslogtreecommitdiffstats
path: root/src/modules/rtp/rtsp_client.c
blob: 629328ade026f9dc6868112c1615cca55061678f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
/***
  This file is part of PulseAudio.

  Copyright 2008 Colin Guthrie

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/ioctl.h>

#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif

#include <pulse/xmalloc.h>

#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/socket-util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/strbuf.h>
#include <pulsecore/ioline.h>

#ifdef HAVE_POLL_H
#include <poll.h>
#else
#include <pulsecore/poll.h>
#endif

#include "rtsp_client.h"

struct pa_rtsp_client {
    pa_mainloop_api *mainloop;
    char *hostname;
    uint16_t port;

    pa_socket_client *sc;
    pa_iochannel *io;
    pa_ioline *ioline;

    pa_rtsp_cb_t callback;

    void *userdata;
    const char *useragent;

    pa_rtsp_state state;
    uint8_t waiting;

    pa_headerlist* headers;
    char *last_header;
    pa_strbuf *header_buffer;
    pa_headerlist* response_headers;

    char *localip;
    char *url;
    uint16_t rtp_port;
    uint32_t cseq;
    char *session;
    char *transport;
};

pa_rtsp_client* pa_rtsp_client_new(pa_mainloop_api *mainloop, const char* hostname, uint16_t port, const char* useragent) {
    pa_rtsp_client *c;

    pa_assert(mainloop);
    pa_assert(hostname);
    pa_assert(port > 0);

    c = pa_xnew0(pa_rtsp_client, 1);
    c->mainloop = mainloop;
    c->hostname = pa_xstrdup(hostname);
    c->port = port;
    c->headers = pa_headerlist_new();

    if (useragent)
        c->useragent = useragent;
    else
        c->useragent = "PulseAudio RTSP Client";

    return c;
}


void pa_rtsp_client_free(pa_rtsp_client* c) {
    pa_assert(c);

    if (c->sc)
        pa_socket_client_unref(c->sc);
    if (c->ioline)
        pa_ioline_close(c->ioline);
    else if (c->io)
        pa_iochannel_free(c->io);

    pa_xfree(c->hostname);
    pa_xfree(c->url);
    pa_xfree(c->localip);
    pa_xfree(c->session);
    pa_xfree(c->transport);
    pa_xfree(c->last_header);
    if (c->header_buffer)
        pa_strbuf_free(c->header_buffer);
    if (c->response_headers)
        pa_headerlist_free(c->response_headers);
    pa_headerlist_free(c->headers);

    pa_xfree(c);
}


static void headers_read(pa_rtsp_client *c) {
    char* token;
    char delimiters[] = ";";

    pa_assert(c);
    pa_assert(c->response_headers);
    pa_assert(c->callback);

    /* Deal with a SETUP response */
    if (STATE_SETUP == c->state) {
        const char* token_state = NULL;
        const char* pc = NULL;
        c->session = pa_xstrdup(pa_headerlist_gets(c->response_headers, "Session"));
        c->transport = pa_xstrdup(pa_headerlist_gets(c->response_headers, "Transport"));

        if (!c->session || !c->transport) {
            pa_log("Invalid SETUP response.");
            return;
        }

        /* Now parse out the server port component of the response. */
        while ((token = pa_split(c->transport, delimiters, &token_state))) {
            if ((pc = strstr(token, "="))) {
                if (0 == strncmp(token, "server_port", 11)) {
                    pa_atou(pc+1, (uint32_t*)(&c->rtp_port));
                    pa_xfree(token);
                    break;
                }
            }
            pa_xfree(token);
        }
        if (0 == c->rtp_port) {
            /* Error no server_port in response */
            pa_log("Invalid SETUP response (no port number).");
            return;
        }
    }

    /* Call our callback */
    c->callback(c, c->state, c->response_headers, c->userdata);
}


static void line_callback(pa_ioline *line, const char *s, void *userdata) {
    char *delimpos;
    char *s2, *s2p;

    pa_rtsp_client *c = userdata;
    pa_assert(line);
    pa_assert(c);
    pa_assert(c->callback);

    if (!s) {
        /* Keep the ioline/iochannel open as they will be freed automatically */
        c->ioline = NULL;
        c->io = NULL;
        c->callback(c, STATE_DISCONNECTED, NULL, c->userdata);
        return;
    }

    s2 = pa_xstrdup(s);
    /* Trim trailing carriage returns */
    s2p = s2 + strlen(s2) - 1;
    while (s2p >= s2 && '\r' == *s2p) {
        *s2p = '\0';
        s2p -= 1;
    }
    if (c->waiting && 0 == strcmp("RTSP/1.0 200 OK", s2)) {
        c->waiting = 0;
        if (c->response_headers)
            pa_headerlist_free(c->response_headers);
        c->response_headers = pa_headerlist_new();
        goto exit;
    }
    if (c->waiting) {
        pa_log_warn("Unexpected response: %s", s2);
        goto exit;;
    }
    if (!strlen(s2)) {
        /* End of headers */
        /* We will have a header left from our looping iteration, so add it in :) */
        if (c->last_header) {
            /* This is not a continuation header so let's dump it into our proplist */
            pa_headerlist_puts(c->response_headers, c->last_header, pa_strbuf_tostring_free(c->header_buffer));
            pa_xfree(c->last_header);
            c->last_header = NULL;
            c->header_buffer= NULL;
        }

        pa_log_debug("Full response received. Dispatching");
        headers_read(c);
        c->waiting = 1;
        goto exit;
    }

    /* Read and parse a header (we know it's not empty) */
    /* TODO: Move header reading into the headerlist. */

    /* If the first character is a space, it's a continuation header */
    if (c->last_header && ' ' == s2[0]) {
        pa_assert(c->header_buffer);

        /* Add this line to the buffer (sans the space. */
        pa_strbuf_puts(c->header_buffer, &(s2[1]));
        goto exit;
    }

    if (c->last_header) {
        /* This is not a continuation header so let's dump the full
          header/value into our proplist */
        pa_headerlist_puts(c->response_headers, c->last_header, pa_strbuf_tostring_free(c->header_buffer));
        pa_xfree(c->last_header);
        c->last_header = NULL;
        c->header_buffer = NULL;
    }

    delimpos = strstr(s2, ":");
    if (!delimpos) {
        pa_log_warn("Unexpected response when expecting header: %s", s);
        goto exit;
    }

    pa_assert(!c->header_buffer);
    pa_assert(!c->last_header);

    c->header_buffer = pa_strbuf_new();
    if (strlen(delimpos) > 1) {
        /* Cut our line off so we can copy the header name out */
        *delimpos++ = '\0';

        /* Trim the front of any spaces */
        while (' ' == *delimpos)
            ++delimpos;

        pa_strbuf_puts(c->header_buffer, delimpos);
    } else {
        /* Cut our line off so we can copy the header name out */
        *delimpos = '\0';
    }

    /* Save the header name */
    c->last_header = pa_xstrdup(s2);
  exit:
    pa_xfree(s2);
}


static void on_connection(pa_socket_client *sc, pa_iochannel *io, void *userdata) {
    pa_rtsp_client *c = userdata;
    union {
        struct sockaddr sa;
        struct sockaddr_in in;
        struct sockaddr_in6 in6;
    } sa;
    socklen_t sa_len = sizeof(sa);

    pa_assert(sc);
    pa_assert(c);
    pa_assert(STATE_CONNECT == c->state);
    pa_assert(c->sc == sc);
    pa_socket_client_unref(c->sc);
    c->sc = NULL;

    if (!io) {
        pa_log("Connection failed: %s", pa_cstrerror(errno));
        return;
    }
    pa_assert(!c->io);
    c->io = io;

    c->ioline = pa_ioline_new(io);
    pa_ioline_set_callback(c->ioline, line_callback, c);

    /* Get the local IP address for use externally */
    if (0 == getsockname(pa_iochannel_get_recv_fd(io), &sa.sa, &sa_len)) {
        char buf[INET6_ADDRSTRLEN];
        const char *res = NULL;

        if (AF_INET == sa.sa.sa_family) {
            if ((res = inet_ntop(sa.sa.sa_family, &sa.in.sin_addr, buf, sizeof(buf)))) {
                c->localip = pa_xstrdup(res);
            }
        } else if (AF_INET6 == sa.sa.sa_family) {
            if ((res = inet_ntop(AF_INET6, &sa.in6.sin6_addr, buf, sizeof(buf)))) {
                c->localip = pa_sprintf_malloc("[%s]", res);
            }
        }
    }
    pa_log_debug("Established RTSP connection from local ip %s", c->localip);

    if (c->callback)
        c->callback(c, c->state, NULL, c->userdata);
}

int pa_rtsp_connect(pa_rtsp_client *c) {
    pa_assert(c);
    pa_assert(!c->sc);

    pa_xfree(c->session);
    c->session = NULL;

    if (!(c->sc = pa_socket_client_new_string(c->mainloop, c->hostname, c->port))) {
        pa_log("failed to connect to server '%s:%d'", c->hostname, c->port);
        return -1;
    }

    pa_socket_client_set_callback(c->sc, on_connection, c);
    c->waiting = 1;
    c->state = STATE_CONNECT;
    return 0;
}

void pa_rtsp_set_callback(pa_rtsp_client *c, pa_rtsp_cb_t callback, void *userdata) {
    pa_assert(c);

    c->callback = callback;
    c->userdata = userdata;
}

void pa_rtsp_disconnect(pa_rtsp_client *c) {
    pa_assert(c);

    if (c->ioline)
        pa_ioline_close(c->ioline);
    else if (c->io)
        pa_iochannel_free(c->io);
    c->io = NULL;
    c->ioline = NULL;
}


const char* pa_rtsp_localip(pa_rtsp_client* c) {
    pa_assert(c);

    return c->localip;
}

uint32_t pa_rtsp_serverport(pa_rtsp_client* c) {
    pa_assert(c);

    return c->rtp_port;
}

void pa_rtsp_set_url(pa_rtsp_client* c, const char* url) {
    pa_assert(c);

    c->url = pa_xstrdup(url);
}

void pa_rtsp_add_header(pa_rtsp_client *c, const char* key, const char* value)
{
    pa_assert(c);
    pa_assert(key);
    pa_assert(value);

    pa_headerlist_puts(c->headers, key, value);
}

void pa_rtsp_remove_header(pa_rtsp_client *c, const char* key)
{
    pa_assert(c);
    pa_assert(key);

    pa_headerlist_remove(c->headers, key);
}

static int rtsp_exec(pa_rtsp_client* c, const char* cmd,
                        const char* content_type, const char* content,
                        int expect_response,
                        pa_headerlist* headers) {
    pa_strbuf* buf;
    char* hdrs;
    ssize_t l;

    pa_assert(c);
    pa_assert(c->url);

    if (!cmd)
        return -1;

    pa_log_debug("Sending command: %s", cmd);

    buf = pa_strbuf_new();
    pa_strbuf_printf(buf, "%s %s RTSP/1.0\r\nCSeq: %d\r\n", cmd, c->url, ++c->cseq);
    if (c->session)
        pa_strbuf_printf(buf, "Session: %s\r\n", c->session);

    /* Add the headers */
    if (headers) {
        hdrs = pa_headerlist_to_string(headers);
        pa_strbuf_puts(buf, hdrs);
        pa_xfree(hdrs);
    }

    if (content_type && content) {
        pa_strbuf_printf(buf, "Content-Type: %s\r\nContent-Length: %d\r\n",
          content_type, (int)strlen(content));
    }

    pa_strbuf_printf(buf, "User-Agent: %s\r\n", c->useragent);

    if (c->headers) {
        hdrs = pa_headerlist_to_string(c->headers);
        pa_strbuf_puts(buf, hdrs);
        pa_xfree(hdrs);
    }

    pa_strbuf_puts(buf, "\r\n");

    if (content_type && content) {
        pa_strbuf_puts(buf, content);
    }

    /* Our packet is created... now we can send it :) */
    hdrs = pa_strbuf_tostring_free(buf);
    /*pa_log_debug("Submitting request:");
    pa_log_debug(hdrs);*/
    l = pa_iochannel_write(c->io, hdrs, strlen(hdrs));
    pa_xfree(hdrs);

    return 0;
}


int pa_rtsp_announce(pa_rtsp_client *c, const char* sdp) {
    pa_assert(c);
    if (!sdp)
        return -1;

    c->state = STATE_ANNOUNCE;
    return rtsp_exec(c, "ANNOUNCE", "application/sdp", sdp, 1, NULL);
}


int pa_rtsp_setup(pa_rtsp_client* c) {
    pa_headerlist* headers;
    int rv;

    pa_assert(c);

    headers = pa_headerlist_new();
    pa_headerlist_puts(headers, "Transport", "RTP/AVP/TCP;unicast;interleaved=0-1;mode=record");

    c->state = STATE_SETUP;
    rv = rtsp_exec(c, "SETUP", NULL, NULL, 1, headers);
    pa_headerlist_free(headers);
    return rv;
}


int pa_rtsp_record(pa_rtsp_client* c, uint16_t* seq, uint32_t* rtptime) {
    pa_headerlist* headers;
    int rv;
    char *info;

    pa_assert(c);
    if (!c->session) {
        /* No session in progress */
        return -1;
    }

    /* Todo: Generate these values randomly as per spec */
    *seq = *rtptime = 0;

    headers = pa_headerlist_new();
    pa_headerlist_puts(headers, "Range", "npt=0-");
    info = pa_sprintf_malloc("seq=%u;rtptime=%u", *seq, *rtptime);
    pa_headerlist_puts(headers, "RTP-Info", info);
    pa_xfree(info);

    c->state = STATE_RECORD;
    rv = rtsp_exec(c, "RECORD", NULL, NULL, 1, headers);
    pa_headerlist_free(headers);
    return rv;
}


int pa_rtsp_teardown(pa_rtsp_client *c) {
    pa_assert(c);

    c->state = STATE_TEARDOWN;
    return rtsp_exec(c, "TEARDOWN", NULL, NULL, 0, NULL);
}


int pa_rtsp_setparameter(pa_rtsp_client *c, const char* param) {
    pa_assert(c);
    if (!param)
        return -1;

    c->state = STATE_SET_PARAMETER;
    return rtsp_exec(c, "SET_PARAMETER", "text/parameters", param, 1, NULL);
}


int pa_rtsp_flush(pa_rtsp_client *c, uint16_t seq, uint32_t rtptime) {
    pa_headerlist* headers;
    int rv;
    char *info;

    pa_assert(c);

    headers = pa_headerlist_new();
    info = pa_sprintf_malloc("seq=%u;rtptime=%u", seq, rtptime);
    pa_headerlist_puts(headers, "RTP-Info", info);
    pa_xfree(info);

    c->state = STATE_FLUSH;
    rv = rtsp_exec(c, "FLUSH", NULL, NULL, 1, headers);
    pa_headerlist_free(headers);
    return rv;
}