libavformat/tcp.c

   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 <unistd.h>
  23 #include "internal.h"
  24 #include "network.h"
  25 #include "os_support.h"
  26 #if HAVE_SYS_SELECT_H
  27 #include <sys/select.h>
  28 #endif
  29 #include <sys/time.h>
  30
  31 typedef struct TCPContext {
  32     int fd;
  33 } TCPContext;
  34
  35 /* return non zero if error */
  36 static int tcp_open(URLContext *h, const char *uri, int flags)
  37 {
  38     struct addrinfo hints, *ai, *cur_ai;
  39     int port, fd = -1;
  40     TCPContext *s = NULL;
  41     fd_set wfds;
  42     int fd_max, ret;
  43     struct timeval tv;
  44     socklen_t optlen;
  45     char hostname[1024],proto[1024],path[1024];
  46     char portstr[10];
  47
  48     ff_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
  49         &port, path, sizeof(path), uri);
  50     if (strcmp(proto,"tcp") || port <= 0 || port >= 65536)
  51         return AVERROR(EINVAL);
  52
  53     memset(&hints, 0, sizeof(hints));
  54     hints.ai_family = AF_UNSPEC;
  55     hints.ai_socktype = SOCK_STREAM;
  56     snprintf(portstr, sizeof(portstr), "%d", port);
  57     if (getaddrinfo(hostname, portstr, &hints, &ai))
  58         return AVERROR(EIO);
  59
  60     cur_ai = ai;
  61
  62  restart:
  63     fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol);
  64     if (fd < 0)
  65         goto fail;
  66     ff_socket_nonblock(fd, 1);
  67
  68  redo:
  69     ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
  70     if (ret < 0) {
  71         if (ff_neterrno() == FF_NETERROR(EINTR))
  72             goto redo;
  73         if (ff_neterrno() != FF_NETERROR(EINPROGRESS) &&
  74             ff_neterrno() != FF_NETERROR(EAGAIN))
  75             goto fail;
  76
  77         /* wait until we are connected or until abort */
  78         for(;;) {
  79             if (url_interrupt_cb()) {
  80                 ret = AVERROR(EINTR);
  81                 goto fail1;
  82             }
  83             fd_max = fd;
  84             FD_ZERO(&wfds);
  85             FD_SET(fd, &wfds);
  86             tv.tv_sec = 0;
  87             tv.tv_usec = 100 * 1000;
  88             ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
  89             if (ret > 0 && FD_ISSET(fd, &wfds))
  90                 break;
  91         }
  92
  93         /* test error */
  94         optlen = sizeof(ret);
  95         getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen);
  96         if (ret != 0)
  97             goto fail;
  98     }
  99     s = av_malloc(sizeof(TCPContext));
 100     if (!s) {
 101         freeaddrinfo(ai);
 102         return AVERROR(ENOMEM);
 103     }
 104     h->priv_data = s;
 105     h->is_streamed = 1;
 106     s->fd = fd;
 107     freeaddrinfo(ai);
 108     return 0;
 109
 110  fail:
 111     if (cur_ai->ai_next) {
 112         /* Retry with the next sockaddr */
 113         cur_ai = cur_ai->ai_next;
 114         if (fd >= 0)
 115             closesocket(fd);
 116         goto restart;
 117     }
 118     ret = AVERROR(EIO);
 119  fail1:
 120     if (fd >= 0)
 121         closesocket(fd);
 122     freeaddrinfo(ai);
 123     return ret;
 124 }
 125
 126 static int tcp_read(URLContext *h, uint8_t *buf, int size)
 127 {
 128     TCPContext *s = h->priv_data;
 129     int len, fd_max, ret;
 130     fd_set rfds;
 131     struct timeval tv;
 132
 133     for (;;) {
 134         if (url_interrupt_cb())
 135             return AVERROR(EINTR);
 136         fd_max = s->fd;
 137         FD_ZERO(&rfds);
 138         FD_SET(s->fd, &rfds);
 139         tv.tv_sec = 0;
 140         tv.tv_usec = 100 * 1000;
 141         ret = select(fd_max + 1, &rfds, NULL, NULL, &tv);
 142         if (ret > 0 && FD_ISSET(s->fd, &rfds)) {
 143             len = recv(s->fd, buf, size, 0);
 144             if (len < 0) {
 145                 if (ff_neterrno() != FF_NETERROR(EINTR) &&
 146                     ff_neterrno() != FF_NETERROR(EAGAIN))
 147                     return AVERROR(ff_neterrno());
 148             } else return len;
 149         } else if (ret < 0) {
 150             if (ff_neterrno() == FF_NETERROR(EINTR))
 151                 continue;
 152             return -1;
 153         }
 154     }
 155 }
 156
 157 static int tcp_write(URLContext *h, uint8_t *buf, int size)
 158 {
 159     TCPContext *s = h->priv_data;
 160     int ret, size1, fd_max, len;
 161     fd_set wfds;
 162     struct timeval tv;
 163
 164     size1 = size;
 165     while (size > 0) {
 166         if (url_interrupt_cb())
 167             return AVERROR(EINTR);
 168         fd_max = s->fd;
 169         FD_ZERO(&wfds);
 170         FD_SET(s->fd, &wfds);
 171         tv.tv_sec = 0;
 172         tv.tv_usec = 100 * 1000;
 173         ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
 174         if (ret > 0 && FD_ISSET(s->fd, &wfds)) {
 175             len = send(s->fd, buf, size, 0);
 176             if (len < 0) {
 177                 if (ff_neterrno() != FF_NETERROR(EINTR) &&
 178                     ff_neterrno() != FF_NETERROR(EAGAIN))
 179                     return AVERROR(ff_neterrno());
 180                 continue;
 181             }
 182             size -= len;
 183             buf += len;
 184         } else if (ret < 0) {
 185             if (ff_neterrno() == FF_NETERROR(EINTR))
 186                 continue;
 187             return -1;
 188         }
 189     }
 190     return size1 - size;
 191 }
 192
 193 static int tcp_close(URLContext *h)
 194 {
 195     TCPContext *s = h->priv_data;
 196     closesocket(s->fd);
 197     av_free(s);
 198     return 0;
 199 }
 200
 201 static int tcp_get_file_handle(URLContext *h)
 202 {
 203     TCPContext *s = h->priv_data;
 204     return s->fd;
 205 }
 206
 207 URLProtocol tcp_protocol = {
 208     "tcp",
 209     tcp_open,
 210     tcp_read,
 211     tcp_write,
 212     NULL, /* seek */
 213     tcp_close,
 214     .url_get_file_handle = tcp_get_file_handle,
 215 };