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

   1 /*
   2  * Copyright (c) 2001 William C. Fenner.
   3  *                All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code
   7  * distributions retain the above copyright notice and this paragraph
   8  * in its entirety, and (2) distributions including binary code include
   9  * the above copyright notice and this paragraph in its entirety in
  10  * the documentation or other materials provided with the distribution.
  11  * The name of William C. Fenner may not be used to endorse or
  12  * promote products derived from this software without specific prior
  13  * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  14  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  15  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  16  * FOR A PARTICULAR PURPOSE.
  17  */
  18 #ifndef lint
  19 static const char rcsid[] =
  20     "@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.1 2001-09-17 20:06:18 fenner Exp $";
  21 #endif
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <stdio.h>
  28
  29 #include "interface.h"
  30 #include "addrtoname.h"
  31 #include "extract.h"
  32
  33 #define MSDP_TYPE_MAX   7
  34
  35 void
  36 msdp_print(const unsigned char *sp, u_int length)
  37 {
  38         unsigned int type, len;
  39
  40         TCHECK2(*sp, 3);
  41         /* See if we think we're at the beginning of a compound packet */
  42         type = *sp;
  43         len = EXTRACT_16BITS(sp + 1);
  44         if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
  45                 goto trunc;     /* not really truncated, but still not decodable */
  46         (void)printf(" msdp:");
  47         while (length > 0) {
  48                 TCHECK2(*sp, 3);
  49                 type = *sp;
  50                 len = EXTRACT_16BITS(sp + 1);
  51                 if (len > 1400 || vflag)
  52                         printf(" [len %d]", len);
  53                 if (len < 3)
  54                         goto trunc;
  55                 sp += 3;
  56                 length -= 3;
  57                 switch (type) {
  58                 case 1: /* IPv4 Source-Active */
  59                 case 3: /* IPv4 Source-Active Response */
  60                         if (type == 1)
  61                                 (void)printf(" SA");
  62                         else
  63                                 (void)printf(" SA-Response");
  64                         TCHECK(*sp);
  65                         (void)printf(" %d entries", *sp);
  66                         if (*sp * 12 + 8 < len) {
  67                                 (void)printf(" [w/data]");
  68                                 if (vflag > 1) {
  69                                         (void)printf(" ");
  70                                         ip_print(sp + *sp * 12 + 8 - 3,
  71                                                  len - (*sp * 12 + 8));
  72                                 }
  73                         }
  74                         break;
  75                 case 2:
  76                         (void)printf(" SA-Request");
  77                         TCHECK2(*sp, 5);
  78                         (void)printf(" for %s", ipaddr_string(sp + 1));
  79                         break;
  80                 case 4:
  81                         (void)printf(" Keepalive");
  82                         if (len != 3)
  83                                 (void)printf("[len=%d] ", len);
  84                         break;
  85                 case 5:
  86                         (void)printf(" Notification");
  87                         break;
  88                 default:
  89                         (void)printf(" [type=%d len=%d]", type, len);
  90                         break;
  91                 }
  92                 sp += (len - 3);
  93                 length -= (len - 3);
  94         }
  95         return;
  96 trunc:
  97         (void)printf(" [|msdp]");
  98 }