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