release/src/router/igmpproxy/src/udpsock.c

   1 /*
   2 **  igmpproxy - IGMP proxy based multicast router
   3 **  Copyright (C) 2005 Johnny Egeland <johnny@rlo.org>
   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
  17 **  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 **
  19 **----------------------------------------------------------------------------
  20 **
  21 **  This software is derived work from the following software. The original
  22 **  source code has been modified from it's original state by the author
  23 **  of igmpproxy.
  24 **
  25 **  smcroute 0.92 - Copyright (C) 2001 Carsten Schill <carsten@cschill.de>
  26 **  - Licensed under the GNU General Public License, version 2
  27 **
  28 **  mrouted 3.9-beta3 - COPYRIGHT 1989 by The Board of Trustees of
  29 **  Leland Stanford Junior University.
  30 **  - Original license can be found in the Stanford.txt file.
  31 **
  32 */
  33 /**
  34 *   udpsock.c contains function for creating a UDP socket.
  35 *
  36 */
  37
  38 #include "igmpproxy.h"
  39
  40 /**
  41 *  Creates and connects a simple UDP socket to the target
  42 *  'PeerInAdr':'PeerPort'
  43 *
  44 *   @param PeerInAdr - The address to connect to
  45 *   @param PeerPort  - The port to connect to
  46 *
  47 */
  48 int openUdpSocket( uint32_t PeerInAdr, uint16_t PeerPort ) {
  49     int Sock;
  50     struct sockaddr_in SockAdr;
  51
  52     if( (Sock = socket( AF_INET, SOCK_RAW, IPPROTO_IGMP )) < 0 )
  53         my_log( LOG_ERR, errno, "UDP socket open" );
  54
  55     memset( &SockAdr, 0, sizeof( SockAdr ) );
  56     SockAdr.sin_family      = AF_INET;
  57     SockAdr.sin_port        = htons(PeerPort);
  58     SockAdr.sin_addr.s_addr = htonl(PeerInAdr);
  59
  60     if( bind( Sock, (struct sockaddr *)&SockAdr, sizeof( SockAdr ) ) )
  61         my_log( LOG_ERR, errno, "UDP socket bind" );
  62
  63     return Sock;
  64 }
  65