bluebox

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/* BlueDataDistributor - data distribution module from ethernet to 32 serial ports
 * version 0.1.1 date 2006-10-07
 * Copyright (C) 2006 Stefan Schuermans <stefan@blinkenarea.org>
 * a BlinkenArea project - http://www.blinkenarea.org/
 */
#include <string.h>
#include "checksum.h"
#include "ethernet.h"
#include "icmp.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"
// send an ICMP packet
// pData must point to a struct IcmpPacket with IcmpHdr.Type, IcmpHdr.Code and IpHdr.Dest already initialized
static void IcmpSend( unsigned char * pData, unsigned short Length )
{
  struct IcmpPacket * pIcmpPack;
  unsigned int chk;
  // packet too short
  if( Length < sizeof( struct IcmpPacket ) )
    return;
  // convert pointer to ICMP packet
  // (this saves us from always casting pData)
  pIcmpPack = (struct IcmpPacket *)pData;
  // fill in header values
  pIcmpPack->IcmpHdr.Chk = 0x0000;
  // generate checksum
  chk = Checksum( (unsigned char *)&pIcmpPack->IcmpHdr, Length - sizeof( struct EthernetHeader ) - sizeof( struct IpHeader ), 0x0000, 0x0000 );
  pIcmpPack->IcmpHdr.Chk = htons( chk );
  // send ICMP packet
  pIcmpPack->IpHdr.Proto = 0x01; // ICMP
  IpSend( pData, Length );
}
// process a received ICMP echo request packet
static void IcmpEchoReqRecv( unsigned char * pData, unsigned short Length )
{
  struct IcmpEchoPacket * pIcmpEchoPack;
  // packet too short
  if( Length < sizeof( struct IcmpEchoPacket ) )
    return;
 
 
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