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/libavformat/tcp.c

http://github.com/FFmpeg/FFmpeg
C | 326 lines | 268 code | 28 blank | 30 comment | 54 complexity | 10d0ad2cbb043cc8a2a1146d521f64eb MD5 | raw file
  1/*
  2 * TCP protocol
  3 * Copyright (c) 2002 Fabrice Bellard
  4 *
  5 * This file is part of FFmpeg.
  6 *
  7 * FFmpeg is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU Lesser General Public
  9 * License as published by the Free Software Foundation; either
 10 * version 2.1 of the License, or (at your option) any later version.
 11 *
 12 * FFmpeg is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15 * Lesser General Public License for more details.
 16 *
 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
 20 */
 21#include "avformat.h"
 22#include "libavutil/avassert.h"
 23#include "libavutil/parseutils.h"
 24#include "libavutil/opt.h"
 25#include "libavutil/time.h"
 26
 27#include "internal.h"
 28#include "network.h"
 29#include "os_support.h"
 30#include "url.h"
 31#if HAVE_POLL_H
 32#include <poll.h>
 33#endif
 34
 35typedef struct TCPContext {
 36    const AVClass *class;
 37    int fd;
 38    int listen;
 39    int open_timeout;
 40    int rw_timeout;
 41    int listen_timeout;
 42    int recv_buffer_size;
 43    int send_buffer_size;
 44    int tcp_nodelay;
 45#if !HAVE_WINSOCK2_H
 46    int tcp_mss;
 47#endif /* !HAVE_WINSOCK2_H */
 48} TCPContext;
 49
 50#define OFFSET(x) offsetof(TCPContext, x)
 51#define D AV_OPT_FLAG_DECODING_PARAM
 52#define E AV_OPT_FLAG_ENCODING_PARAM
 53static const AVOption options[] = {
 54    { "listen",          "Listen for incoming connections",  OFFSET(listen),         AV_OPT_TYPE_INT, { .i64 = 0 },     0,       2,       .flags = D|E },
 55    { "timeout",     "set timeout (in microseconds) of socket I/O operations", OFFSET(rw_timeout),     AV_OPT_TYPE_INT, { .i64 = -1 },         -1, INT_MAX, .flags = D|E },
 56    { "listen_timeout",  "Connection awaiting timeout (in milliseconds)",      OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 },         -1, INT_MAX, .flags = D|E },
 57    { "send_buffer_size", "Socket send buffer size (in bytes)",                OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 },         -1, INT_MAX, .flags = D|E },
 58    { "recv_buffer_size", "Socket receive buffer size (in bytes)",             OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 },         -1, INT_MAX, .flags = D|E },
 59    { "tcp_nodelay", "Use TCP_NODELAY to disable nagle's algorithm",           OFFSET(tcp_nodelay), AV_OPT_TYPE_BOOL, { .i64 = 0 },             0, 1, .flags = D|E },
 60#if !HAVE_WINSOCK2_H
 61    { "tcp_mss",     "Maximum segment size for outgoing TCP packets",          OFFSET(tcp_mss),     AV_OPT_TYPE_INT, { .i64 = -1 },         -1, INT_MAX, .flags = D|E },
 62#endif /* !HAVE_WINSOCK2_H */
 63    { NULL }
 64};
 65
 66static const AVClass tcp_class = {
 67    .class_name = "tcp",
 68    .item_name  = av_default_item_name,
 69    .option     = options,
 70    .version    = LIBAVUTIL_VERSION_INT,
 71};
 72
 73static void customize_fd(void *ctx, int fd)
 74{
 75    TCPContext *s = ctx;
 76    /* Set the socket's send or receive buffer sizes, if specified.
 77       If unspecified or setting fails, system default is used. */
 78    if (s->recv_buffer_size > 0) {
 79        if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size))) {
 80            ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_RCVBUF)");
 81        }
 82    }
 83    if (s->send_buffer_size > 0) {
 84        if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size))) {
 85            ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_SNDBUF)");
 86        }
 87    }
 88    if (s->tcp_nodelay > 0) {
 89        if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &s->tcp_nodelay, sizeof (s->tcp_nodelay))) {
 90            ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_NODELAY)");
 91        }
 92    }
 93#if !HAVE_WINSOCK2_H
 94    if (s->tcp_mss > 0) {
 95        if (setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof (s->tcp_mss))) {
 96            ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_MAXSEG)");
 97        }
 98    }
 99#endif /* !HAVE_WINSOCK2_H */
100}
101
102/* return non zero if error */
103static int tcp_open(URLContext *h, const char *uri, int flags)
104{
105    struct addrinfo hints = { 0 }, *ai, *cur_ai;
106    int port, fd = -1;
107    TCPContext *s = h->priv_data;
108    const char *p;
109    char buf[256];
110    int ret;
111    char hostname[1024],proto[1024],path[1024];
112    char portstr[10];
113    s->open_timeout = 5000000;
114
115    av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
116        &port, path, sizeof(path), uri);
117    if (strcmp(proto, "tcp"))
118        return AVERROR(EINVAL);
119    if (port <= 0 || port >= 65536) {
120        av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
121        return AVERROR(EINVAL);
122    }
123    p = strchr(uri, '?');
124    if (p) {
125        if (av_find_info_tag(buf, sizeof(buf), "listen", p)) {
126            char *endptr = NULL;
127            s->listen = strtol(buf, &endptr, 10);
128            /* assume if no digits were found it is a request to enable it */
129            if (buf == endptr)
130                s->listen = 1;
131        }
132        if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
133            s->rw_timeout = strtol(buf, NULL, 10);
134        }
135        if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
136            s->listen_timeout = strtol(buf, NULL, 10);
137        }
138    }
139    if (s->rw_timeout >= 0) {
140        s->open_timeout =
141        h->rw_timeout   = s->rw_timeout;
142    }
143    hints.ai_family = AF_UNSPEC;
144    hints.ai_socktype = SOCK_STREAM;
145    snprintf(portstr, sizeof(portstr), "%d", port);
146    if (s->listen)
147        hints.ai_flags |= AI_PASSIVE;
148    if (!hostname[0])
149        ret = getaddrinfo(NULL, portstr, &hints, &ai);
150    else
151        ret = getaddrinfo(hostname, portstr, &hints, &ai);
152    if (ret) {
153        av_log(h, AV_LOG_ERROR,
154               "Failed to resolve hostname %s: %s\n",
155               hostname, gai_strerror(ret));
156        return AVERROR(EIO);
157    }
158
159    cur_ai = ai;
160
161#if HAVE_STRUCT_SOCKADDR_IN6
162    // workaround for IOS9 getaddrinfo in IPv6 only network use hardcode IPv4 address can not resolve port number.
163    if (cur_ai->ai_family == AF_INET6){
164        struct sockaddr_in6 * sockaddr_v6 = (struct sockaddr_in6 *)cur_ai->ai_addr;
165        if (!sockaddr_v6->sin6_port){
166            sockaddr_v6->sin6_port = htons(port);
167        }
168    }
169#endif
170
171    if (s->listen > 0) {
172        while (cur_ai && fd < 0) {
173            fd = ff_socket(cur_ai->ai_family,
174                           cur_ai->ai_socktype,
175                           cur_ai->ai_protocol);
176            if (fd < 0) {
177                ret = ff_neterrno();
178                cur_ai = cur_ai->ai_next;
179            }
180        }
181        if (fd < 0)
182            goto fail1;
183        customize_fd(s, fd);
184    }
185
186    if (s->listen == 2) {
187        // multi-client
188        if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) < 0)
189            goto fail1;
190    } else if (s->listen == 1) {
191        // single client
192        if ((ret = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
193                                  s->listen_timeout, h)) < 0)
194            goto fail1;
195        // Socket descriptor already closed here. Safe to overwrite to client one.
196        fd = ret;
197    } else {
198        ret = ff_connect_parallel(ai, s->open_timeout / 1000, 3, h, &fd, customize_fd, s);
199        if (ret < 0)
200            goto fail1;
201    }
202
203    h->is_streamed = 1;
204    s->fd = fd;
205
206    freeaddrinfo(ai);
207    return 0;
208
209 fail1:
210    if (fd >= 0)
211        closesocket(fd);
212    freeaddrinfo(ai);
213    return ret;
214}
215
216static int tcp_accept(URLContext *s, URLContext **c)
217{
218    TCPContext *sc = s->priv_data;
219    TCPContext *cc;
220    int ret;
221    av_assert0(sc->listen);
222    if ((ret = ffurl_alloc(c, s->filename, s->flags, &s->interrupt_callback)) < 0)
223        return ret;
224    cc = (*c)->priv_data;
225    ret = ff_accept(sc->fd, sc->listen_timeout, s);
226    if (ret < 0) {
227        ffurl_closep(c);
228        return ret;
229    }
230    cc->fd = ret;
231    return 0;
232}
233
234static int tcp_read(URLContext *h, uint8_t *buf, int size)
235{
236    TCPContext *s = h->priv_data;
237    int ret;
238
239    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
240        ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback);
241        if (ret)
242            return ret;
243    }
244    ret = recv(s->fd, buf, size, 0);
245    if (ret == 0)
246        return AVERROR_EOF;
247    return ret < 0 ? ff_neterrno() : ret;
248}
249
250static int tcp_write(URLContext *h, const uint8_t *buf, int size)
251{
252    TCPContext *s = h->priv_data;
253    int ret;
254
255    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
256        ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback);
257        if (ret)
258            return ret;
259    }
260    ret = send(s->fd, buf, size, MSG_NOSIGNAL);
261    return ret < 0 ? ff_neterrno() : ret;
262}
263
264static int tcp_shutdown(URLContext *h, int flags)
265{
266    TCPContext *s = h->priv_data;
267    int how;
268
269    if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
270        how = SHUT_RDWR;
271    } else if (flags & AVIO_FLAG_WRITE) {
272        how = SHUT_WR;
273    } else {
274        how = SHUT_RD;
275    }
276
277    return shutdown(s->fd, how);
278}
279
280static int tcp_close(URLContext *h)
281{
282    TCPContext *s = h->priv_data;
283    closesocket(s->fd);
284    return 0;
285}
286
287static int tcp_get_file_handle(URLContext *h)
288{
289    TCPContext *s = h->priv_data;
290    return s->fd;
291}
292
293static int tcp_get_window_size(URLContext *h)
294{
295    TCPContext *s = h->priv_data;
296    int avail;
297    socklen_t avail_len = sizeof(avail);
298
299#if HAVE_WINSOCK2_H
300    /* SO_RCVBUF with winsock only reports the actual TCP window size when
301    auto-tuning has been disabled via setting SO_RCVBUF */
302    if (s->recv_buffer_size < 0) {
303        return AVERROR(ENOSYS);
304    }
305#endif
306
307    if (getsockopt(s->fd, SOL_SOCKET, SO_RCVBUF, &avail, &avail_len)) {
308        return ff_neterrno();
309    }
310    return avail;
311}
312
313const URLProtocol ff_tcp_protocol = {
314    .name                = "tcp",
315    .url_open            = tcp_open,
316    .url_accept          = tcp_accept,
317    .url_read            = tcp_read,
318    .url_write           = tcp_write,
319    .url_close           = tcp_close,
320    .url_get_file_handle = tcp_get_file_handle,
321    .url_get_short_seek  = tcp_get_window_size,
322    .url_shutdown        = tcp_shutdown,
323    .priv_data_size      = sizeof(TCPContext),
324    .flags               = URL_PROTOCOL_FLAG_NETWORK,
325    .priv_data_class     = &tcp_class,
326};