stream/udp.c

   1 /*
   2  *  Copyright (C) 2006 Benjamin Zores
   3  *   Network helpers for UDP connections (originally borrowed from rtp.c).
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *   This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software Foundation,
  17  *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include "config.h"
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <sys/types.h>
  28 #include <sys/time.h>
  29 #include <ctype.h>
  30
  31 #ifndef HAVE_WINSOCK2
  32 #include <netdb.h>
  33 #include <netinet/in.h>
  34 #include <sys/socket.h>
  35 #include <arpa/inet.h>
  36 #define closesocket close
  37 #else
  38 #include <winsock2.h>
  39 #include <ws2tcpip.h>
  40 #endif
  41
  42 #include "mp_msg.h"
  43 #include "url.h"
  44 #include "udp.h"
  45
  46 /* Start listening on a UDP port. If multicast, join the group. */
  47 int
  48 udp_open_socket (URL_t *url)
  49 {
  50   int socket_server_fd, rxsockbufsz;
  51   int err;
  52   socklen_t err_len;
  53   fd_set set;
  54   struct sockaddr_in server_address;
  55   struct ip_mreq mcast;
  56   struct timeval tv;
  57   struct hostent *hp;
  58
  59   mp_msg (MSGT_NETWORK, MSGL_V,
  60           "Listening for traffic on %s:%d ...\n", url->hostname, url->port);
  61
  62   socket_server_fd = socket (AF_INET, SOCK_DGRAM, 0);
  63   if (socket_server_fd == -1)
  64   {
  65     mp_msg (MSGT_NETWORK, MSGL_ERR, "Failed to create socket\n");
  66     return -1;
  67   }
  68
  69   if (isalpha (url->hostname[0]))
  70   {
  71 #ifndef HAVE_WINSOCK2
  72     hp = (struct hostent *) gethostbyname (url->hostname);
  73     if (!hp)
  74     {
  75       mp_msg (MSGT_NETWORK, MSGL_ERR,
  76               "Counldn't resolve name: %s\n", url->hostname);
  77       closesocket (socket_server_fd);
  78       return -1;
  79     }
  80     memcpy ((void *) &server_address.sin_addr.s_addr,
  81             (void *) hp->h_addr_list[0], hp->h_length);
  82 #else
  83     server_address.sin_addr.s_addr = htonl (INADDR_ANY);
  84 #endif /* HAVE_WINSOCK2 */
  85   }
  86   else
  87   {
  88 #ifndef HAVE_WINSOCK2
  89 #ifdef USE_ATON
  90     inet_aton (url->hostname, &server_address.sin_addr);
  91 #else
  92     inet_pton (AF_INET, url->hostname, &server_address.sin_addr);
  93 #endif /* USE_ATON */
  94 #else
  95     server_address.sin_addr.s_addr = htonl(INADDR_ANY);
  96 #endif /* HAVE_WINSOCK2 */
  97   }
  98   server_address.sin_family = AF_INET;
  99   server_address.sin_port = htons (url->port);
 100
 101   if (bind (socket_server_fd, (struct sockaddr *) &server_address,
 102             sizeof (server_address)) == -1)
 103   {
 104 #ifndef HAVE_WINSOCK2
 105     if (errno != EINPROGRESS)
 106 #else
 107     if (WSAGetLastError () != WSAEINPROGRESS)
 108 #endif /* HAVE_WINSOCK2 */
 109     {
 110       mp_msg (MSGT_NETWORK, MSGL_ERR, "Failed to connect to server\n");
 111       closesocket (socket_server_fd);
 112       return -1;
 113     }
 114   }
 115
 116 #ifdef HAVE_WINSOCK2
 117   if (isalpha (url->hostname[0]))
 118   {
 119     hp = (struct hostent *) gethostbyname (url->hostname);
 120     if (!hp)
 121     {
 122       mp_msg (MSGT_NETWORK, MSGL_ERR,
 123               "Counldn't resolve name: %s\n", url->hostname);
 124       closesocket (socket_server_fd);
 125       return -1;
 126     }
 127     memcpy ((void *) &server_address.sin_addr.s_addr,
 128             (void *) hp->h_addr, hp->h_length);
 129   }
 130   else
 131   {
 132     unsigned int addr = inet_addr (url->hostname);
 133     memcpy ((void *) &server_address.sin_addr, (void *) &addr, sizeof (addr));
 134   }
 135 #endif /* HAVE_WINSOCK2 */
 136
 137   /* Increase the socket rx buffer size to maximum -- this is UDP */
 138   rxsockbufsz = 240 * 1024;
 139   if (setsockopt (socket_server_fd, SOL_SOCKET, SO_RCVBUF,
 140                   &rxsockbufsz, sizeof (rxsockbufsz)))
 141   {
 142     mp_msg (MSGT_NETWORK, MSGL_ERR,
 143             "Couldn't set receive socket buffer size\n");
 144   }
 145
 146   if ((ntohl (server_address.sin_addr.s_addr) >> 28) == 0xe)
 147   {
 148     mcast.imr_multiaddr.s_addr = server_address.sin_addr.s_addr;
 149     mcast.imr_interface.s_addr = 0;
 150
 151     if (setsockopt (socket_server_fd, IPPROTO_IP,
 152                     IP_ADD_MEMBERSHIP, &mcast, sizeof (mcast)))
 153     {
 154       mp_msg (MSGT_NETWORK, MSGL_ERR, "IP_ADD_MEMBERSHIP failed (do you have multicasting enabled in your kernel?)\n");
 155       closesocket (socket_server_fd);
 156       return -1;
 157     }
 158   }
 159
 160   tv.tv_sec = 0;
 161   tv.tv_usec = (1 * 1000000);   /* 1 second timeout */
 162
 163   FD_ZERO (&set);
 164   FD_SET (socket_server_fd, &set);
 165
 166   err = select (socket_server_fd + 1, &set, NULL, NULL, &tv);
 167   if (err < 0)
 168   {
 169     mp_msg (MSGT_NETWORK, MSGL_FATAL,
 170             "Select failed: %s\n", strerror (errno));
 171     closesocket (socket_server_fd);
 172     return -1;
 173   }
 174
 175   if (err == 0)
 176   {
 177     mp_msg (MSGT_NETWORK, MSGL_ERR,
 178             "Timeout! No data from host %s\n", url->hostname);
 179     closesocket (socket_server_fd);
 180     return -1;
 181   }
 182
 183   err_len = sizeof (err);
 184   getsockopt (socket_server_fd, SOL_SOCKET, SO_ERROR, &err, &err_len);
 185   if (err)
 186   {
 187     mp_msg (MSGT_NETWORK, MSGL_DBG2, "Socket error: %d\n", err);
 188     closesocket (socket_server_fd);
 189     return -1;
 190   }
 191
 192   return socket_server_fd;
 193 }