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datalink.c

/*
 * datalink.c -- calculates datalink offsets
 * Part of the tcpick project
 *
 * Author: Francesco Stablum <duskdruid @ despammed.com>
 *
 * Copyright (C) 2003, 2004  Francesco Stablum
 * Licensed under the GPL
 *
 */

/* 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at you option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111,
 * USA.
 */

#include "tcpick.h"
#include "extern.h"

char *datalink2str(int dl_id)
{
      char *str = NULL;
      if (str)
      {
            S_free (str);
            str = NULL;
      }
      str = S_calloc(128 , 1);

      debug( "datalink number: %d" , dl_id );
      switch(dl_id) {
#ifdef DLT_NULL
      case DLT_NULL:
            strcpy(str, "DLT_NULL");
            break;
#endif
#ifdef DLT_EN10MB
      case DLT_EN10MB:
            strcpy(str, "DLT_EN10MB");
            break;
#endif
#ifdef DLT_IEEE802
      case DLT_IEEE802:
            strcpy(str, "DLT_IEEE802");
            break;
#endif
#ifdef DLT_ARCNET
      case DLT_ARCNET:
            strcpy(str, "DLT_ARCNET");
            break;
#endif
#ifdef DLT_FDDI
      case DLT_FDDI:
            strcpy(str, "DLT_FDDI");
            break;
#endif
#ifdef DLT_ATM_RFC1483
      case DLT_ATM_RFC1483:
            strcpy(str, "DLT_ATM_RFC1483");
            break;
#endif
#ifdef DLT_RAW  
      case DLT_RAW:  
            strcpy(str, "DLT_RAW"); 
            break; 
#endif
#ifdef DLT_PPP_SERIAL
      case DLT_PPP_SERIAL:
            strcpy(str, "DLT_PPP_SERIAL");
            break;
#endif
#ifdef DLT_PPP_ETHER
      case DLT_PPP_ETHER:
            strcpy(str, "DLT_PPP_ETHER");
            break;
#endif
#ifdef DLT_C_HDLC
      case DLT_C_HDLC:
            strcpy(str, "DLT_C_HDLC");
            break;
#endif
#ifdef DLT_IEEE802_11
      case DLT_IEEE802_11:
            strcpy(str, "DLT_IEEE802_11");
            break;
#endif
#ifdef DLT_LOOP
      case DLT_LOOP:
            strcpy(str, "DLT_LOOP");
            break;
#endif
#ifdef DLT_LINUX_SLL
      case DLT_LINUX_SLL:
            strcpy(str, "DLT_LINUX_SLL");
            break;
#endif
#ifdef DLT_LTALK
      case DLT_LTALK:
            strcpy(str, "DLT_LTALK");
            break;
#endif
#ifdef DLT_PFLOG
      case DLT_PFLOG:
            strcpy(str, "DLT_PFLOG");
            break;
#endif
#ifdef DLT_PPP
      case DLT_PPP:
            strcpy(str, "DLT_PPP");
            break;
#endif 
#ifdef DLT_SLIP
      case DLT_SLIP:
            strcpy(str, "DLT_SLIP");
            break;
#endif
#ifdef DLT_SLIP_BSDOS
      case DLT_SLIP_BSDOS:
            strcpy(str, "DLT_SLIP_BSDOS");
            break;
#endif
#ifdef DLT_PPP_BSDOS
      case DLT_PPP_BSDOS:
            strcpy(str, "DLT_PPP_BSDOS");
            break;
#endif

      default:
            sprintf(str, "UNKNOWN(0x%x)(%d)" , dl_id , dl_id);
            break;

      }
      return str;
}

int datalink2off(int dl_id)
{
      int dl_size = 0;
      switch(dl_id) {

#ifdef DLT_NULL /* not tested */
      case DLT_NULL:
            dl_size = 4;
            break;
#endif
#ifdef DLT_EN10MB
      case DLT_EN10MB:
            dl_size = 14;
            break;
#endif
#ifdef DLT_RAW
      case DLT_RAW:
            dl_size = 0;
            break;
#endif
#ifdef DLT_IEEE802_11 /* not tested */
      case DLT_IEEE802_11:
            dl_size = 24;
            break;
#endif
#ifdef DLT_LOOP /* not tested */
      case DLT_LOOP:
            dl_size = 4;
            break;
#endif
#ifdef DLT_PPP_ETHER
      case DLT_PPP_ETHER:
            dl_size = 8; 
            break;
#endif
#ifdef DLT_LINUX_SLL
      case DLT_LINUX_SLL:
            dl_size = 16; 
            break;
#endif
#ifdef DLT_PFLOG 
      case DLT_PFLOG:
            dl_size = 48;
            break;
#endif

/* credits for DLT_PPP, DLT_SLIP, DLT_SLIP_BSDOS
   and DLT_PPP_BSDOS offsets:
   SNiFf v0.3 by uLiX
   http://www.s0ftpj.org/bfi/online/bfi10/BFi10-05.html
*/
#ifdef DLT_PPP
      case DLT_PPP:
            dl_size = 4;
            break;
#endif
#ifdef DLT_SLIP
      case DLT_SLIP:
            dl_size = 16;
            break;
#endif
#ifdef DLT_SLIP_BSDOS
      case DLT_SLIP_BSDOS:
            dl_size = 24;
            break;
#endif
#ifdef DLT_PPP_BSDOS
      case DLT_PPP_BSDOS:
            dl_size = 24;
            break;
#endif

      default:
            suicide("datalink2off", 
                  "Sorry, datalink %s type not recognized by %s !\n", 
                  datalink2str(dl_id), PACKAGE_STRING);
            
      }
      return dl_size;
}

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