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