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 "network.h"
  24 #include "os_support.h"
  25 #include <sys/time.h>
  26
  27 typedef struct TCPContext {
  28     int fd;
  29 } TCPContext;
  30
  31 /* return non zero if error */
  32 static int tcp_open(URLContext *h, const char *uri, int flags)
  33 {
  34     struct sockaddr_in dest_addr;
  35     char hostname[1024], *q;
  36     int port, fd = -1;
  37     TCPContext *s = NULL;
  38     fd_set wfds;
  39     int fd_max, ret;
  40     struct timeval tv;
  41     socklen_t optlen;
  42     char proto[1024],path[1024],tmp[1024];
  43
  44     if(!ff_network_init())
  45         return AVERROR(EIO);
  46
  47     url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
  48       &port, path, sizeof(path), uri);
  49     if (strcmp(proto,"tcp")) goto fail;
  50     if ((q = strchr(hostname,'@'))) { strcpy(tmp,q+1); strcpy(hostname,tmp); }
  51
  52     if (port <= 0 || port >= 65536)
  53         goto fail;
  54
  55     dest_addr.sin_family = AF_INET;
  56     dest_addr.sin_port = htons(port);
  57     if (resolve_host(&dest_addr.sin_addr, hostname) < 0)
  58         goto fail;
  59
  60     fd = socket(AF_INET, SOCK_STREAM, 0);
  61     if (fd < 0)
  62         goto fail;
  63     ff_socket_nonblock(fd, 1);
  64
  65  redo:
  66     ret = connect(fd, (struct sockaddr *)&dest_addr,
  67                   sizeof(dest_addr));
  68     if (ret < 0) {
  69         if (ff_neterrno() == FF_NETERROR(EINTR))
  70             goto redo;
  71         if (ff_neterrno() != FF_NETERROR(EINPROGRESS) &&
  72             ff_neterrno() != FF_NETERROR(EAGAIN))
  73             goto fail;
  74
  75         /* wait until we are connected or until abort */
  76         for(;;) {
  77             if (url_interrupt_cb()) {
  78                 ret = AVERROR(EINTR);
  79                 goto fail1;
  80             }
  81             fd_max = fd;
  82             FD_ZERO(&wfds);
  83             FD_SET(fd, &wfds);
  84             tv.tv_sec = 0;
  85             tv.tv_usec = 100 * 1000;
  86             ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
  87             if (ret > 0 && FD_ISSET(fd, &wfds))
  88                 break;
  89         }
  90
  91         /* test error */
  92         optlen = sizeof(ret);
  93         getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen);
  94         if (ret != 0)
  95             goto fail;
  96     }
  97     s = av_malloc(sizeof(TCPContext));
  98     if (!s)
  99         return AVERROR(ENOMEM);
 100     h->priv_data = s;
 101     h->is_streamed = 1;
 102     s->fd = fd;
 103     return 0;
 104
 105  fail:
 106     ret = AVERROR(EIO);
 107  fail1:
 108     if (fd >= 0)
 109         closesocket(fd);
 110     return ret;
 111 }
 112
 113 static int tcp_read(URLContext *h, uint8_t *buf, int size)
 114 {
 115     TCPContext *s = h->priv_data;
 116     int len, fd_max, ret;
 117     fd_set rfds;
 118     struct timeval tv;
 119
 120     for (;;) {
 121         if (url_interrupt_cb())
 122             return AVERROR(EINTR);
 123         fd_max = s->fd;
 124         FD_ZERO(&rfds);
 125         FD_SET(s->fd, &rfds);
 126         tv.tv_sec = 0;
 127         tv.tv_usec = 100 * 1000;
 128         ret = select(fd_max + 1, &rfds, NULL, NULL, &tv);
 129         if (ret > 0 && FD_ISSET(s->fd, &rfds)) {
 130             len = recv(s->fd, buf, size, 0);
 131             if (len < 0) {
 132                 if (ff_neterrno() != FF_NETERROR(EINTR) &&
 133                     ff_neterrno() != FF_NETERROR(EAGAIN))
 134                     return AVERROR(errno);
 135             } else return len;
 136         } else if (ret < 0) {
 137             return -1;
 138         }
 139     }
 140 }
 141
 142 static int tcp_write(URLContext *h, uint8_t *buf, int size)
 143 {
 144     TCPContext *s = h->priv_data;
 145     int ret, size1, fd_max, len;
 146     fd_set wfds;
 147     struct timeval tv;
 148
 149     size1 = size;
 150     while (size > 0) {
 151         if (url_interrupt_cb())
 152             return AVERROR(EINTR);
 153         fd_max = s->fd;
 154         FD_ZERO(&wfds);
 155         FD_SET(s->fd, &wfds);
 156         tv.tv_sec = 0;
 157         tv.tv_usec = 100 * 1000;
 158         ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
 159         if (ret > 0 && FD_ISSET(s->fd, &wfds)) {
 160             len = send(s->fd, buf, size, 0);
 161             if (len < 0) {
 162                 if (ff_neterrno() != FF_NETERROR(EINTR) &&
 163                     ff_neterrno() != FF_NETERROR(EAGAIN))
 164                     return AVERROR(errno);
 165                 continue;
 166             }
 167             size -= len;
 168             buf += len;
 169         } else if (ret < 0) {
 170             return -1;
 171         }
 172     }
 173     return size1 - size;
 174 }
 175
 176 static int tcp_close(URLContext *h)
 177 {
 178     TCPContext *s = h->priv_data;
 179     closesocket(s->fd);
 180     ff_network_close();
 181     av_free(s);
 182     return 0;
 183 }
 184
 185 URLProtocol tcp_protocol = {
 186     "tcp",
 187     tcp_open,
 188     tcp_read,
 189     tcp_write,
 190     NULL, /* seek */
 191     tcp_close,
 192 };