File: udp.c

package info (click to toggle)
dvblast 3.4-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 688 kB
  • sloc: ansic: 10,589; sh: 382; makefile: 79
file content (478 lines) | stat: -rw-r--r-- 15,821 bytes parent folder | download
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
/*****************************************************************************
 * udp.c: UDP input for DVBlast
 *****************************************************************************
 * Copyright (C) 2009, 2015 VideoLAN
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <errno.h>

#include <ev.h>

#include <bitstream/common.h>
#include <bitstream/ietf/rtp.h>

#include "dvblast.h"

/*****************************************************************************
 * Local declarations
 *****************************************************************************/
#define UDP_LOCK_TIMEOUT 5000000 /* 5 s */
#define PRINT_REFRACTORY_PERIOD 1000000 /* 1 s */

static int i_handle;
static struct ev_io udp_watcher;
static struct ev_timer mute_watcher;
static bool b_udp = false;
static int i_block_cnt;
static uint8_t pi_ssrc[4] = { 0, 0, 0, 0 };
static uint16_t i_seqnum = 0;
static bool b_sync = false;
static mtime_t i_last_print = 0;
static struct sockaddr_storage last_addr;

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static void udp_Read(struct ev_loop *loop, struct ev_io *w, int revents);
static void udp_MuteCb(struct ev_loop *loop, struct ev_timer *w, int revents);

/*****************************************************************************
 * udp_Open
 *****************************************************************************/
void udp_Open( void )
{
    int i_family;
    struct addrinfo *p_connect_ai = NULL, *p_bind_ai;
    int i_if_index = 0;
    in_addr_t i_if_addr = INADDR_ANY;
    int i_mtu = 0;
    char *psz_ifname = NULL;

    char *psz_bind, *psz_string = strdup( psz_udp_src );
    char *psz_save = psz_string;
    int i = 1;

    /* Parse configuration. */

    if ( (psz_bind = strchr( psz_string, '@' )) != NULL )
    {
        *psz_bind++ = '\0';
        p_connect_ai = ParseNodeService( psz_string, NULL, 0 );
    }
    else
        psz_bind = psz_string;

    p_bind_ai = ParseNodeService( psz_bind, &psz_string, DEFAULT_PORT );
    if ( p_bind_ai == NULL )
    {
        msg_Err( NULL, "couldn't parse %s", psz_bind );
        exit(EXIT_FAILURE);
    }
    i_family = p_bind_ai->ai_family;

    if ( p_connect_ai != NULL && p_connect_ai->ai_family != i_family )
    {
        msg_Warn( NULL, "invalid connect address" );
        freeaddrinfo( p_connect_ai );
        p_connect_ai = NULL;
    }

    while ( (psz_string = strchr( psz_string, '/' )) != NULL )
    {
        *psz_string++ = '\0';

#define IS_OPTION( option ) (!strncasecmp( psz_string, option, strlen(option) ))
#define ARG_OPTION( option ) (psz_string + strlen(option))

        if ( IS_OPTION("udp") )
            b_udp = true;
        else if ( IS_OPTION("mtu=") )
            i_mtu = strtol( ARG_OPTION("mtu="), NULL, 0 );
        else if ( IS_OPTION("ifindex=") )
            i_if_index = strtol( ARG_OPTION("ifindex="), NULL, 0 );
        else if ( IS_OPTION("ifaddr=") ) {
            char *option = config_stropt( ARG_OPTION("ifaddr=") );
            i_if_addr = inet_addr( option );
            free( option );
        }
        else if ( IS_OPTION("ifname=") )
        {
            psz_ifname = config_stropt( ARG_OPTION("ifname=") );
            if (strlen(psz_ifname) >= IFNAMSIZ) {
                psz_ifname[IFNAMSIZ-1] = '\0';
            }
        } else
            msg_Warn( NULL, "unrecognized option %s", psz_string );

#undef IS_OPTION
#undef ARG_OPTION
    }

    if ( !i_mtu )
        i_mtu = i_family == AF_INET6 ? DEFAULT_IPV6_MTU : DEFAULT_IPV4_MTU;
    i_block_cnt = (i_mtu - (b_udp ? 0 : RTP_HEADER_SIZE)) / TS_SIZE;


    /* Do stuff. */

    if ( (i_handle = socket( i_family, SOCK_DGRAM, IPPROTO_UDP )) < 0 )
    {
        msg_Err( NULL, "couldn't create socket (%s)", strerror(errno) );
        exit(EXIT_FAILURE);
    }

    setsockopt( i_handle, SOL_SOCKET, SO_REUSEADDR, (void *) &i, sizeof( i ) );

    /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) to avoid
     * packet loss caused by scheduling problems */
    i = 0x80000;

    setsockopt( i_handle, SOL_SOCKET, SO_RCVBUF, (void *) &i, sizeof( i ) );

    if ( bind( i_handle, p_bind_ai->ai_addr, p_bind_ai->ai_addrlen ) < 0 )
    {
        msg_Err( NULL, "couldn't bind (%s)", strerror(errno) );
        close( i_handle );
        exit(EXIT_FAILURE);
    }

    if ( p_connect_ai != NULL )
    {
        uint16_t i_port;
        if ( i_family == AF_INET6 )
            i_port = ((struct sockaddr_in6 *)p_connect_ai->ai_addr)->sin6_port;
        else
            i_port = ((struct sockaddr_in *)p_connect_ai->ai_addr)->sin_port;

        if ( i_port != 0 && connect( i_handle, p_connect_ai->ai_addr,
                                     p_connect_ai->ai_addrlen ) < 0 )
            msg_Warn( NULL, "couldn't connect socket (%s)", strerror(errno) );
    }

    /* Join the multicast group if the socket is a multicast address */
    if ( i_family == AF_INET6 )
    {
        struct sockaddr_in6 *p_addr =
            (struct sockaddr_in6 *)p_bind_ai->ai_addr;
        if ( IN6_IS_ADDR_MULTICAST( &p_addr->sin6_addr ) )
        {
            struct ipv6_mreq imr;
            imr.ipv6mr_multiaddr = p_addr->sin6_addr;
            imr.ipv6mr_interface = i_if_index;
            if ( i_if_addr != INADDR_ANY )
                msg_Warn( NULL, "ignoring ifaddr option in IPv6" );

            if ( setsockopt( i_handle, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
                             (char *)&imr, sizeof(struct ipv6_mreq) ) < 0 )
                msg_Warn( NULL, "couldn't join multicast group (%s)",
                          strerror(errno) );
        }
    }
    else
    {
        struct sockaddr_in *p_addr =
            (struct sockaddr_in *)p_bind_ai->ai_addr;
        if ( IN_MULTICAST( ntohl(p_addr->sin_addr.s_addr)) )
        {
            if ( p_connect_ai != NULL )
            {
#ifndef IP_ADD_SOURCE_MEMBERSHIP
                msg_Err( NULL, "IP_ADD_SOURCE_MEMBERSHIP is unsupported." );
#else
                /* Source-specific multicast */
                struct sockaddr *p_src = p_connect_ai->ai_addr;
                struct ip_mreq_source imr;
                imr.imr_multiaddr = p_addr->sin_addr;
                imr.imr_interface.s_addr = i_if_addr;
                imr.imr_sourceaddr = ((struct sockaddr_in *)p_src)->sin_addr;
                if ( i_if_index )
                    msg_Warn( NULL, "ignoring ifindex option in SSM" );

                if ( setsockopt( i_handle, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP,
                            (char *)&imr, sizeof(struct ip_mreq_source) ) < 0 )
                    msg_Warn( NULL, "couldn't join multicast group (%s)",
                              strerror(errno) );
#endif
            }
            else if ( i_if_index )
            {
                /* Linux-specific interface-bound multicast */
                struct ip_mreqn imr;
                imr.imr_multiaddr = p_addr->sin_addr;
#if defined(__linux__)
                imr.imr_address.s_addr = i_if_addr;
                imr.imr_ifindex = i_if_index;
#endif

                if ( setsockopt( i_handle, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                                 (char *)&imr, sizeof(struct ip_mreqn) ) < 0 )
                    msg_Warn( NULL, "couldn't join multicast group (%s)",
                              strerror(errno) );
            }
            else
            {
                /* Regular multicast */
                struct ip_mreq imr;
                imr.imr_multiaddr = p_addr->sin_addr;
                imr.imr_interface.s_addr = i_if_addr;

                if ( setsockopt( i_handle, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                                 (char *)&imr, sizeof(struct ip_mreq) ) == -1 )
                    msg_Warn( NULL, "couldn't join multicast group (%s)",
                              strerror(errno) );
            }
#ifdef SO_BINDTODEVICE
            if (psz_ifname) {
                if ( setsockopt( i_handle, SOL_SOCKET, SO_BINDTODEVICE,
                                 psz_ifname, strlen(psz_ifname)+1 ) < 0 ) {
                    msg_Err( NULL, "couldn't bind to device %s (%s)",
                             psz_ifname, strerror(errno) );
                }
                free(psz_ifname);
                psz_ifname = NULL;
            }
#endif
        }
    }

    freeaddrinfo( p_bind_ai );
    if ( p_connect_ai != NULL )
        freeaddrinfo( p_connect_ai );
    free( psz_save );

    msg_Dbg( NULL, "binding socket to %s", psz_udp_src );

    ev_io_init(&udp_watcher, udp_Read, i_handle, EV_READ);
    ev_io_start(event_loop, &udp_watcher);

    ev_timer_init(&mute_watcher, udp_MuteCb,
                  UDP_LOCK_TIMEOUT / 1000000., UDP_LOCK_TIMEOUT / 1000000.);
    memset(&last_addr, 0, sizeof(last_addr));
}

/*****************************************************************************
 * UDP events
 *****************************************************************************/
static void udp_Read(struct ev_loop *loop, struct ev_io *w, int revents)
{
    i_wallclock = mdate();
    if ( i_last_print + PRINT_REFRACTORY_PERIOD < i_wallclock )
    {
        i_last_print = i_wallclock;

        struct sockaddr_storage addr;
        struct msghdr mh = {
            .msg_name = &addr,
            .msg_namelen = sizeof(addr),
            .msg_iov = NULL,
            .msg_iovlen = 0,
            .msg_control = NULL,
            .msg_controllen = 0,
            .msg_flags = 0
        };
        if ( recvmsg( i_handle, &mh, MSG_DONTWAIT | MSG_PEEK ) != -1 &&
             mh.msg_namelen >= sizeof(struct sockaddr) )
        {
            char psz_addr[256], psz_port[42];
            if ( memcmp( &addr, &last_addr, mh.msg_namelen ) &&
                 getnameinfo( (const struct sockaddr *)&addr, mh.msg_namelen,
                     psz_addr, sizeof(psz_addr), psz_port, sizeof(psz_port),
                     NI_DGRAM | NI_NUMERICHOST | NI_NUMERICSERV ) == 0 )
            {
                memcpy( &last_addr, &addr, mh.msg_namelen );

                msg_Info( NULL, "source: %s:%s", psz_addr, psz_port );
                switch (i_print_type) {
                case PRINT_XML:
                    fprintf(print_fh, "<STATUS type=\"source\" address=\"%s\" port=\"%s\"/>\n", psz_addr, psz_port);
                    break;
                case PRINT_TEXT:
                    fprintf(print_fh, "source status: %s:%s\n", psz_addr, psz_port);
                    break;
                default:
                    break;
                }
            }
        }
    }

    struct iovec p_iov[i_block_cnt + 1];
    block_t *p_ts, **pp_current = &p_ts;
    int i_iov, i_block;
    ssize_t i_len;
    uint8_t p_rtp_hdr[RTP_HEADER_SIZE];

    if ( !b_udp )
    {
        /* FIXME : this is wrong if RTP header > 12 bytes */
        p_iov[0].iov_base = p_rtp_hdr;
        p_iov[0].iov_len = RTP_HEADER_SIZE;
        i_iov = 1;
    }
    else
        i_iov = 0;

    for ( i_block = 0; i_block < i_block_cnt; i_block++ )
    {
        *pp_current = block_New();
        p_iov[i_iov].iov_base = (*pp_current)->p_ts;
        p_iov[i_iov].iov_len = TS_SIZE;
        pp_current = &(*pp_current)->p_next;
        i_iov++;
    }
    pp_current = &p_ts;

    if ( (i_len = readv( i_handle, p_iov, i_iov )) < 0 )
    {
        msg_Err( NULL, "couldn't read from network (%s)", strerror(errno) );
        goto err;
    }

    if ( !b_udp )
    {
        uint8_t pi_new_ssrc[4];

        if ( !rtp_check_hdr(p_rtp_hdr) )
            msg_Warn( NULL, "invalid RTP packet received" );
        if ( rtp_get_type(p_rtp_hdr) != RTP_TYPE_TS )
            msg_Warn( NULL, "non-TS RTP packet received" );
        rtp_get_ssrc(p_rtp_hdr, pi_new_ssrc);
        if ( !memcmp( pi_ssrc, pi_new_ssrc, 4 * sizeof(uint8_t) ) )
        {
            if ( rtp_get_seqnum(p_rtp_hdr) != i_seqnum )
                msg_Warn( NULL, "RTP discontinuity" );
        }
        else
        {
            struct in_addr addr;
            memcpy( &addr.s_addr, pi_new_ssrc, 4 * sizeof(uint8_t) );
            msg_Dbg( NULL, "new RTP source: %s", inet_ntoa( addr ) );
            memcpy( pi_ssrc, pi_new_ssrc, 4 * sizeof(uint8_t) );
            switch (i_print_type) {
            case PRINT_XML:
                fprintf(print_fh,
                        "<STATUS type=\"rtpsource\" source=\"%s\"/>\n",
                        inet_ntoa( addr ));
                break;
            case PRINT_TEXT:
                fprintf(print_fh, "rtpsource: %s\n", inet_ntoa( addr ) );
                break;
            default:
                break;
            }
        }
        i_seqnum = rtp_get_seqnum(p_rtp_hdr) + 1;

        i_len -= RTP_HEADER_SIZE;
    }

    i_len /= TS_SIZE;

    if ( i_len )
    {
        if ( !b_sync )
        {
            msg_Info( NULL, "frontend has acquired lock" );
            switch (i_print_type) {
            case PRINT_XML:
                fprintf(print_fh, "<STATUS type=\"lock\" status=\"1\"/>\n");
                break;
            case PRINT_TEXT:
                fprintf(print_fh, "lock status: 1\n");
                break;
            default:
                break;
            }

            b_sync = true;
        }

        ev_timer_again(loop, &mute_watcher);
    }

    while ( i_len && *pp_current )
    {
        pp_current = &(*pp_current)->p_next;
        i_len--;
    }

err:
    block_DeleteChain( *pp_current );
    *pp_current = NULL;

    demux_Run( p_ts );
}

static void udp_MuteCb(struct ev_loop *loop, struct ev_timer *w, int revents)
{
    msg_Warn( NULL, "frontend has lost lock" );
    ev_timer_stop(loop, w);

    switch (i_print_type) {
    case PRINT_XML:
        fprintf(print_fh, "<STATUS type=\"lock\" status=\"0\"/>\n");
        break;
    case PRINT_TEXT:
        fprintf(print_fh, "lock status: 0\n" );
        break;
    default:
        break;
    }
}

/* From now on these are just stubs */

/*****************************************************************************
 * udp_SetFilter
 *****************************************************************************/
int udp_SetFilter( uint16_t i_pid )
{
    return -1;
}

/*****************************************************************************
 * udp_UnsetFilter: normally never called
 *****************************************************************************/
void udp_UnsetFilter( int i_fd, uint16_t i_pid )
{
}

/*****************************************************************************
 * udp_Reset:
 *****************************************************************************/
void udp_Reset( void )
{
}