udp.c 14.2 KB
Newer Older
Fabrice Bellard's avatar
Fabrice Bellard committed
1 2
/*
 * UDP prototype streaming system
3
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
Fabrice Bellard's avatar
Fabrice Bellard committed
4
 *
5 6 7
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
Fabrice Bellard's avatar
Fabrice Bellard committed
8 9
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
Fabrice Bellard's avatar
Fabrice Bellard committed
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
Fabrice Bellard's avatar
Fabrice Bellard committed
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Fabrice Bellard's avatar
Fabrice Bellard committed
14 15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
Fabrice Bellard's avatar
Fabrice Bellard committed
16
 *
Fabrice Bellard's avatar
Fabrice Bellard committed
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Fabrice Bellard's avatar
Fabrice Bellard committed
20
 */
Luca Barbato's avatar
Luca Barbato committed
21 22

/**
23
 * @file libavformat/udp.c
Luca Barbato's avatar
Luca Barbato committed
24 25 26
 * UDP protocol
 */

27
#define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc */
Fabrice Bellard's avatar
Fabrice Bellard committed
28
#include "avformat.h"
Fabrice Bellard's avatar
Fabrice Bellard committed
29
#include <unistd.h>
30
#include "network.h"
31
#include "os_support.h"
32
#if HAVE_SYS_SELECT_H
33 34
#include <sys/select.h>
#endif
35
#include <sys/time.h>
Fabrice Bellard's avatar
Fabrice Bellard committed
36

37 38 39 40
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
41 42 43 44 45 46
#ifndef IN_MULTICAST
#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
#endif
#ifndef IN6_IS_ADDR_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
#endif
47

Fabrice Bellard's avatar
Fabrice Bellard committed
48
typedef struct {
49 50
    int udp_fd;
    int ttl;
51
    int buffer_size;
52 53
    int is_multicast;
    int local_port;
54
    int reuse_socket;
55
    struct sockaddr_storage dest_addr;
56
    int dest_addr_len;
Fabrice Bellard's avatar
Fabrice Bellard committed
57 58 59
} UDPContext;

#define UDP_TX_BUF_SIZE 32768
Ramiro Polla's avatar
Ramiro Polla committed
60
#define UDP_MAX_PKT_SIZE 65536
Fabrice Bellard's avatar
Fabrice Bellard committed
61

62
static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
63
#ifdef IP_MULTICAST_TTL
64 65
    if (addr->sa_family == AF_INET) {
        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
66
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
67 68 69
            return -1;
        }
    }
70
#endif
71
#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
72 73
    if (addr->sa_family == AF_INET6) {
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
74
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
75 76 77
            return -1;
        }
    }
78
#endif
79 80 81
    return 0;
}

82
static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
83
#ifdef IP_ADD_MEMBERSHIP
84
    if (addr->sa_family == AF_INET) {
85 86
        struct ip_mreq mreq;

87 88 89
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
        mreq.imr_interface.s_addr= INADDR_ANY;
        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
90
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
91 92 93
            return -1;
        }
    }
94
#endif
95
#if HAVE_STRUCT_IPV6_MREQ
96
    if (addr->sa_family == AF_INET6) {
97 98
        struct ipv6_mreq mreq6;

99 100 101
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
        mreq6.ipv6mr_interface= 0;
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
102
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
103 104 105
            return -1;
        }
    }
106
#endif
107 108 109
    return 0;
}

110
static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
111
#ifdef IP_DROP_MEMBERSHIP
112
    if (addr->sa_family == AF_INET) {
113 114
        struct ip_mreq mreq;

115 116 117
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
        mreq.imr_interface.s_addr= INADDR_ANY;
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
118
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
119 120 121
            return -1;
        }
    }
122
#endif
123
#if HAVE_STRUCT_IPV6_MREQ
124
    if (addr->sa_family == AF_INET6) {
125 126
        struct ipv6_mreq mreq6;

127 128 129
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
        mreq6.ipv6mr_interface= 0;
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
130
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
131 132 133
            return -1;
        }
    }
134
#endif
135 136 137
    return 0;
}

138
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
139 140 141
    struct addrinfo hints, *res = 0;
    int error;
    char sport[16];
142
    const char *node = 0, *service = "0";
143 144

    if (port > 0) {
Michael Niedermayer's avatar
Michael Niedermayer committed
145
        snprintf(sport, sizeof(sport), "%d", port);
146 147 148 149 150
        service = sport;
    }
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
        node = hostname;
    }
Luca Abeni's avatar
Luca Abeni committed
151 152 153 154 155 156 157 158
    memset(&hints, 0, sizeof(hints));
    hints.ai_socktype = type;
    hints.ai_family   = family;
    hints.ai_flags = flags;
    if ((error = getaddrinfo(node, service, &hints, &res))) {
        av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
    }

159 160 161
    return res;
}

162
static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
163
    struct addrinfo *res0;
164 165
    int addr_len;

166
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
167
    if (res0 == 0) return AVERROR(EIO);
168 169
    memcpy(addr, res0->ai_addr, res0->ai_addrlen);
    addr_len = res0->ai_addrlen;
170
    freeaddrinfo(res0);
171 172

    return addr_len;
173 174
}

175 176 177 178 179
static int is_multicast_address(struct sockaddr_storage *addr)
{
    if (addr->ss_family == AF_INET) {
        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
    }
180
#if HAVE_STRUCT_SOCKADDR_IN6
181 182 183
    if (addr->ss_family == AF_INET6) {
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
    }
184
#endif
185 186 187 188

    return 0;
}

Luca Abeni's avatar
Luca Abeni committed
189 190
static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
{
191
    int udp_fd = -1;
192
    struct addrinfo *res0 = NULL, *res = NULL;
193
    int family = AF_UNSPEC;
194

195 196 197
    if (((struct sockaddr *) &s->dest_addr)->sa_family)
        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
    res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
Luca Abeni's avatar
Luca Abeni committed
198 199 200 201 202
    if (res0 == 0)
        goto fail;
    for (res = res0; res; res=res->ai_next) {
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
        if (udp_fd > 0) break;
Luca Abeni's avatar
Luca Abeni committed
203
        av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
204
    }
205 206

    if (udp_fd < 0)
207
        goto fail;
208

Luca Abeni's avatar
Luca Abeni committed
209 210
    memcpy(addr, res->ai_addr, res->ai_addrlen);
    *addr_len = res->ai_addrlen;
211

Luca Abeni's avatar
Luca Abeni committed
212
    freeaddrinfo(res0);
213

214
    return udp_fd;
215

216 217 218
 fail:
    if (udp_fd >= 0)
        closesocket(udp_fd);
219 220
    if(res0)
        freeaddrinfo(res0);
221 222 223
    return -1;
}

Luca Abeni's avatar
Luca Abeni committed
224 225
static int udp_port(struct sockaddr_storage *addr, int addr_len)
{
226
    char sbuf[sizeof(int)*3+1];
Luca Abeni's avatar
Luca Abeni committed
227

228
    if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
Luca Abeni's avatar
Luca Abeni committed
229
        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
230 231 232 233 234 235
        return -1;
    }

    return strtol(sbuf, NULL, 10);
}

236

237 238 239 240 241 242
/**
 * If no filename is given to av_open_input_file because you want to
 * get the local port first, then you must call this function to set
 * the remote server address.
 *
 * url syntax: udp://host:port[?option=val...]
243
 * option: 'ttl=n'       : set the ttl value (for multicast only)
244
 *         'localport=n' : set the local port
245
 *         'pkt_size=n'  : set max packet size
246
 *         'reuse=1'     : enable reusing the socket
247 248 249 250 251 252 253 254 255 256
 *
 * @param s1 media file context
 * @param uri of the remote server
 * @return zero if no error.
 */
int udp_set_remote_url(URLContext *h, const char *uri)
{
    UDPContext *s = h->priv_data;
    char hostname[256];
    int port;
257

258
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
Fabrice Bellard's avatar
Fabrice Bellard committed
259

260
    /* set the destination address */
261 262
    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
    if (s->dest_addr_len < 0) {
263
        return AVERROR(EIO);
264
    }
265
    s->is_multicast = is_multicast_address(&s->dest_addr);
266

267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285
    return 0;
}

/**
 * Return the local port used by the UDP connexion
 * @param s1 media file context
 * @return the local port number
 */
int udp_get_local_port(URLContext *h)
{
    UDPContext *s = h->priv_data;
    return s->local_port;
}

/**
 * Return the udp file handle for select() usage to wait for several RTP
 * streams at the same time.
 * @param h media file context
 */
286 287 288
#if (LIBAVFORMAT_VERSION_MAJOR >= 53)
static
#endif
289 290 291 292 293 294 295
int udp_get_file_handle(URLContext *h)
{
    UDPContext *s = h->priv_data;
    return s->udp_fd;
}

/* put it in UDP context */
Fabrice Bellard's avatar
Fabrice Bellard committed
296 297 298 299
/* return non zero if error */
static int udp_open(URLContext *h, const char *uri, int flags)
{
    char hostname[1024];
300
    int port, udp_fd = -1, tmp, bind_ret = -1;
301
    UDPContext *s = NULL;
302
    int is_output;
303 304
    const char *p;
    char buf[256];
Luca Abeni's avatar
Luca Abeni committed
305 306
    struct sockaddr_storage my_addr;
    int len;
Fabrice Bellard's avatar
Fabrice Bellard committed
307 308

    h->is_streamed = 1;
309
    h->max_packet_size = 1472;
Fabrice Bellard's avatar
Fabrice Bellard committed
310

311
    is_output = (flags & URL_WRONLY);
312

313 314 315
    if(!ff_network_init())
        return AVERROR(EIO);

316
    s = av_mallocz(sizeof(UDPContext));
317
    if (!s)
318
        return AVERROR(ENOMEM);
319 320 321

    h->priv_data = s;
    s->ttl = 16;
322 323
    s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;

324 325
    p = strchr(uri, '?');
    if (p) {
326
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
327 328 329 330 331 332
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
            s->ttl = strtol(buf, NULL, 10);
        }
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
            s->local_port = strtol(buf, NULL, 10);
        }
333 334 335
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
            h->max_packet_size = strtol(buf, NULL, 10);
        }
336 337 338
        if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
            s->buffer_size = strtol(buf, NULL, 10);
        }
Fabrice Bellard's avatar
Fabrice Bellard committed
339
    }
340 341

    /* fill the dest addr */
342
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
343

344 345 346
    /* XXX: fix url_split */
    if (hostname[0] == '\0' || hostname[0] == '?') {
        /* only accepts null hostname if input */
347
        if (flags & URL_WRONLY)
348 349 350 351
            goto fail;
    } else {
        udp_set_remote_url(h, uri);
    }
Fabrice Bellard's avatar
Fabrice Bellard committed
352

353 354
    if (s->is_multicast && !(h->flags & URL_WRONLY))
        s->local_port = port;
Luca Abeni's avatar
Luca Abeni committed
355
    udp_fd = udp_socket_create(s, &my_addr, &len);
356 357 358
    if (udp_fd < 0)
        goto fail;

359 360 361 362
    if (s->reuse_socket)
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
            goto fail;

Fabrice Bellard's avatar
Fabrice Bellard committed
363
    /* the bind is needed to give a port to the socket now */
364 365 366 367 368 369 370
    /* if multicast, try the multicast address bind first */
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
        bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
    }
    /* bind to the local address if not multicast or if the multicast
     * bind failed */
    if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
Fabrice Bellard's avatar
Fabrice Bellard committed
371 372
        goto fail;

373 374
    len = sizeof(my_addr);
    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
Luca Abeni's avatar
Luca Abeni committed
375 376
    s->local_port = udp_port(&my_addr, len);

377 378
    if (s->is_multicast) {
        if (h->flags & URL_WRONLY) {
379
            /* output */
380
            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
381 382
                goto fail;
        } else {
383
            /* input */
384
            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
385 386 387
                goto fail;
        }
    }
Fabrice Bellard's avatar
Fabrice Bellard committed
388

389 390
    if (is_output) {
        /* limit the tx buf size to limit latency */
391
        tmp = s->buffer_size;
392
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
Luca Abeni's avatar
Luca Abeni committed
393
            av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
394 395
            goto fail;
        }
Ramiro Polla's avatar
Ramiro Polla committed
396 397 398
    } else {
        /* set udp recv buffer size to the largest possible udp packet size to
         * avoid losing data on OSes that set this too low by default. */
399 400 401 402
        tmp = s->buffer_size;
        if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
            av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
        }
403 404
        /* make the socket non-blocking */
        ff_socket_nonblock(udp_fd, 1);
405 406 407
    }

    s->udp_fd = udp_fd;
Fabrice Bellard's avatar
Fabrice Bellard committed
408 409
    return 0;
 fail:
410
    if (udp_fd >= 0)
411
        closesocket(udp_fd);
412
    av_free(s);
413
    return AVERROR(EIO);
Fabrice Bellard's avatar
Fabrice Bellard committed
414 415
}

416
static int udp_read(URLContext *h, uint8_t *buf, int size)
Fabrice Bellard's avatar
Fabrice Bellard committed
417 418
{
    UDPContext *s = h->priv_data;
Måns Rullgård's avatar
Måns Rullgård committed
419
    int len;
420 421 422
    fd_set rfds;
    int ret;
    struct timeval tv;
423 424

    for(;;) {
425 426 427 428 429 430 431 432 433 434 435
        if (url_interrupt_cb())
            return AVERROR(EINTR);
        FD_ZERO(&rfds);
        FD_SET(s->udp_fd, &rfds);
        tv.tv_sec = 0;
        tv.tv_usec = 100 * 1000;
        ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
        if (ret < 0)
            return AVERROR(EIO);
        if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
            continue;
436
        len = recv(s->udp_fd, buf, size, 0);
437
        if (len < 0) {
438 439
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
                ff_neterrno() != FF_NETERROR(EINTR))
440
                return AVERROR(EIO);
441 442 443 444 445
        } else {
            break;
        }
    }
    return len;
Fabrice Bellard's avatar
Fabrice Bellard committed
446 447
}

448
static int udp_write(URLContext *h, uint8_t *buf, int size)
Fabrice Bellard's avatar
Fabrice Bellard committed
449 450
{
    UDPContext *s = h->priv_data;
451 452 453
    int ret;

    for(;;) {
454
        ret = sendto (s->udp_fd, buf, size, 0,
455
                      (struct sockaddr *) &s->dest_addr,
456
                      s->dest_addr_len);
457
        if (ret < 0) {
458 459
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
                ff_neterrno() != FF_NETERROR(EAGAIN))
460
                return AVERROR(EIO);
461 462 463
        } else {
            break;
        }
Fabrice Bellard's avatar
Fabrice Bellard committed
464
    }
465 466 467 468 469 470 471
    return size;
}

static int udp_close(URLContext *h)
{
    UDPContext *s = h->priv_data;

472
    if (s->is_multicast && !(h->flags & URL_WRONLY))
473
        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
474
    closesocket(s->udp_fd);
475
    ff_network_close();
476 477
    av_free(s);
    return 0;
Fabrice Bellard's avatar
Fabrice Bellard committed
478 479 480 481 482
}

URLProtocol udp_protocol = {
    "udp",
    udp_open,
483
    udp_read,
Fabrice Bellard's avatar
Fabrice Bellard committed
484 485 486
    udp_write,
    NULL, /* seek */
    udp_close,
487
    .url_get_file_handle = udp_get_file_handle,
Fabrice Bellard's avatar
Fabrice Bellard committed
488
};