The Tcpdump Group git mirrors - tcpdump/blob - print-calm-fast.c

   1 /*
   2  * Copyright (c) 2013 The TCPDUMP project
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that: (1) source code
   6  * distributions retain the above copyright notice and this paragraph
   7  * in its entirety, and (2) distributions including binary code include
   8  * the above copyright notice and this paragraph in its entirety in
   9  * the documentation or other materials provided with the distribution.
  10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  11  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  12  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  13  * FOR A PARTICULAR PURPOSE.
  14  *
  15  * Original code by Ola Martin Lykkja (ola.lykkja@q-free.com)
  16  */
  17
  18 /* \summary: Communication access for land mobiles (CALM) printer */
  19
  20 #include <config.h>
  21
  22 #include "netdissect-stdinc.h"
  23
  24 #define ND_LONGJMP_FROM_TCHECK
  25 #include "netdissect.h"
  26 #include "extract.h"
  27 #include "addrtoname.h"
  28
  29 /*
  30    ISO 29281:2009
  31    Intelligent Transport Systems . Communications access for land mobiles (CALM)
  32    CALM non-IP networking
  33 */
  34
  35 /*
  36  * This is the top level routine of the printer.  'bp' points
  37  * to the calm header of the packet.
  38  */
  39 void
  40 calm_fast_print(netdissect_options *ndo, const u_char *bp, u_int length, const struct lladdr_info *src)
  41 {
  42         ndo->ndo_protocol = "calm_fast";
  43
  44         ND_PRINT("CALM FAST");
  45         if (src != NULL)
  46                 ND_PRINT(" src:%s", (src->addr_string)(ndo, src->addr));
  47         ND_PRINT("; ");
  48
  49         if (length < 2) {
  50                 ND_PRINT(" (length %u < 2)", length);
  51                 goto invalid;
  52         }
  53
  54         ND_PRINT("SrcNwref:%u; ", GET_U_1(bp));
  55         length -= 1;
  56         bp += 1;
  57
  58         ND_PRINT("DstNwref:%u; ", GET_U_1(bp));
  59         length -= 1;
  60         bp += 1;
  61
  62         if (ndo->ndo_vflag)
  63                 ND_DEFAULTPRINT(bp, length);
  64         return;
  65
  66 invalid:
  67         nd_print_invalid(ndo);
  68         ND_TCHECK_LEN(bp, length);
  69 }