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