libavformat/tcp.c

   1 /*
   2  * TCP protocol
   3  * Copyright (c) 2002 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #if defined(__APPLE__) || defined(__BEOS__)
  25 typedef int socklen_t;
  26 #endif
  27 #ifndef __BEOS__
  28 # include <arpa/inet.h>
  29 #else
  30 # include "barpainet.h"
  31 #endif
  32 #include <netdb.h>
  33 #include <sys/time.h>
  34 #include <fcntl.h>
  35
  36 typedef struct TCPContext {
  37     int fd;
  38 } TCPContext;
  39
  40 /* resolve host with also IP address parsing */
  41 int resolve_host(struct in_addr *sin_addr, const char *hostname)
  42 {
  43     struct hostent *hp;
  44
  45     if ((inet_aton(hostname, sin_addr)) == 0) {
  46         hp = gethostbyname(hostname);
  47         if (!hp)
  48             return -1;
  49         memcpy (sin_addr, hp->h_addr, sizeof(struct in_addr));
  50     }
  51     return 0;
  52 }
  53
  54 /* return non zero if error */
  55 static int tcp_open(URLContext *h, const char *uri, int flags)
  56 {
  57     struct sockaddr_in dest_addr;
  58     char hostname[1024], *q;
  59     int port, fd = -1;
  60     TCPContext *s;
  61     const char *p;
  62     fd_set wfds;
  63     int fd_max, ret;
  64     struct timeval tv;
  65     socklen_t optlen;
  66
  67     s = av_malloc(sizeof(TCPContext));
  68     if (!s)
  69         return -ENOMEM;
  70     h->priv_data = s;
  71     p = uri;
  72     if (!strstart(p, "tcp://", &p))
  73         goto fail;
  74     q = hostname;
  75     while (*p != ':' && *p != '/' && *p != '\0') {
  76         if ((q - hostname) < sizeof(hostname) - 1)
  77             *q++ = *p;
  78         p++;
  79     }
  80     *q = '\0';
  81     if (*p != ':')
  82         goto fail;
  83     p++;
  84     port = strtoul(p, (char **)&p, 10);
  85     if (port <= 0 || port >= 65536)
  86         goto fail;
  87
  88     dest_addr.sin_family = AF_INET;
  89     dest_addr.sin_port = htons(port);
  90     if (resolve_host(&dest_addr.sin_addr, hostname) < 0)
  91         goto fail;
  92
  93     fd = socket(PF_INET, SOCK_STREAM, 0);
  94     if (fd < 0)
  95         goto fail;
  96     fcntl(fd, F_SETFL, O_NONBLOCK);
  97
  98  redo:
  99     ret = connect(fd, (struct sockaddr *)&dest_addr,
 100                   sizeof(dest_addr));
 101     if (ret < 0) {
 102         if (errno == EINTR)
 103             goto redo;
 104         if (errno != EINPROGRESS)
 105             goto fail;
 106
 107         /* wait until we are connected or until abort */
 108         for(;;) {
 109             if (url_interrupt_cb()) {
 110                 ret = -EINTR;
 111                 goto fail1;
 112             }
 113             fd_max = fd;
 114             FD_ZERO(&wfds);
 115             FD_SET(fd, &wfds);
 116             tv.tv_sec = 0;
 117             tv.tv_usec = 100 * 1000;
 118             ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
 119             if (ret > 0 && FD_ISSET(fd, &wfds))
 120                 break;
 121         }
 122
 123         /* test error */
 124         optlen = sizeof(ret);
 125         getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen);
 126         if (ret != 0)
 127             goto fail;
 128     }
 129     s->fd = fd;
 130     return 0;
 131
 132  fail:
 133     ret = -EIO;
 134  fail1:
 135     if (fd >= 0)
 136         close(fd);
 137     av_free(s);
 138     return ret;
 139 }
 140
 141 static int tcp_read(URLContext *h, uint8_t *buf, int size)
 142 {
 143     TCPContext *s = h->priv_data;
 144     int len, fd_max;
 145     fd_set rfds;
 146     struct timeval tv;
 147
 148     for (;;) {
 149         if (url_interrupt_cb())
 150             return -EINTR;
 151         fd_max = s->fd;
 152         FD_ZERO(&rfds);
 153         FD_SET(s->fd, &rfds);
 154         tv.tv_sec = 0;
 155         tv.tv_usec = 100 * 1000;
 156         select(fd_max + 1, &rfds, NULL, NULL, &tv);
 157 #ifdef __BEOS__
 158         len = recv(s->fd, buf, size, 0);
 159 #else
 160         len = read(s->fd, buf, size);
 161 #endif
 162         if (len < 0) {
 163             if (errno != EINTR && errno != EAGAIN)
 164 #ifdef __BEOS__
 165                 return errno;
 166 #else
 167                 return -errno;
 168 #endif
 169         } else break;
 170     }
 171     return len;
 172 }
 173
 174 static int tcp_write(URLContext *h, uint8_t *buf, int size)
 175 {
 176     TCPContext *s = h->priv_data;
 177     int ret, size1, fd_max;
 178     fd_set wfds;
 179     struct timeval tv;
 180
 181     size1 = size;
 182     while (size > 0) {
 183         if (url_interrupt_cb())
 184             return -EINTR;
 185         fd_max = s->fd;
 186         FD_ZERO(&wfds);
 187         FD_SET(s->fd, &wfds);
 188         tv.tv_sec = 0;
 189         tv.tv_usec = 100 * 1000;
 190         select(fd_max + 1, NULL, &wfds, NULL, &tv);
 191 #ifdef __BEOS__
 192         ret = send(s->fd, buf, size, 0);
 193 #else
 194         ret = write(s->fd, buf, size);
 195 #endif
 196         if (ret < 0) {
 197             if (errno != EINTR && errno != EAGAIN) {
 198 #ifdef __BEOS__
 199                 return errno;
 200 #else
 201                 return -errno;
 202 #endif
 203             }
 204             continue;
 205         }
 206         size -= ret;
 207         buf += ret;
 208     }
 209     return size1 - size;
 210 }
 211
 212 static int tcp_close(URLContext *h)
 213 {
 214     TCPContext *s = h->priv_data;
 215 #ifdef CONFIG_BEOS_NETSERVER
 216     closesocket(s->fd);
 217 #else
 218     close(s->fd);
 219 #endif
 220     av_free(s);
 221     return 0;
 222 }
 223
 224 URLProtocol tcp_protocol = {
 225     "tcp",
 226     tcp_open,
 227     tcp_read,
 228     tcp_write,
 229     NULL, /* seek */
 230     tcp_close,
 231 };