external/bsd/tcpdump/dist/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
  19 #include <sys/cdefs.h>
  20 #ifndef lint
  21 __RCSID("$NetBSD: print-msdp.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  22 #endif
  23
  24 #define NETDISSECT_REWORKED
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"
  34
  35 #define MSDP_TYPE_MAX   7
  36
  37 void
  38 msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
  39 {
  40         unsigned int type, len;
  41
  42         ND_TCHECK2(*sp, 3);
  43         /* See if we think we're at the beginning of a compound packet */
  44         type = *sp;
  45         len = EXTRACT_16BITS(sp + 1);
  46         if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
  47                 goto trunc;     /* not really truncated, but still not decodable */
  48         ND_PRINT((ndo, " msdp:"));
  49         while (length > 0) {
  50                 ND_TCHECK2(*sp, 3);
  51                 type = *sp;
  52                 len = EXTRACT_16BITS(sp + 1);
  53                 if (len > 1400 || ndo->ndo_vflag)
  54                         ND_PRINT((ndo, " [len %u]", len));
  55                 if (len < 3)
  56                         goto trunc;
  57                 sp += 3;
  58                 length -= 3;
  59                 switch (type) {
  60                 case 1: /* IPv4 Source-Active */
  61                 case 3: /* IPv4 Source-Active Response */
  62                         if (type == 1)
  63                                 ND_PRINT((ndo, " SA"));
  64                         else
  65                                 ND_PRINT((ndo, " SA-Response"));
  66                         ND_TCHECK(*sp);
  67                         ND_PRINT((ndo, " %u entries", *sp));
  68                         if ((u_int)((*sp * 12) + 8) < len) {
  69                                 ND_PRINT((ndo, " [w/data]"));
  70                                 if (ndo->ndo_vflag > 1) {
  71                                         ND_PRINT((ndo, " "));
  72                                         ip_print(ndo, sp + *sp * 12 + 8 - 3,
  73                                                  len - (*sp * 12 + 8));
  74                                 }
  75                         }
  76                         break;
  77                 case 2:
  78                         ND_PRINT((ndo, " SA-Request"));
  79                         ND_TCHECK2(*sp, 5);
  80                         ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
  81                         break;
  82                 case 4:
  83                         ND_PRINT((ndo, " Keepalive"));
  84                         if (len != 3)
  85                                 ND_PRINT((ndo, "[len=%d] ", len));
  86                         break;
  87                 case 5:
  88                         ND_PRINT((ndo, " Notification"));
  89                         break;
  90                 default:
  91                         ND_PRINT((ndo, " [type=%d len=%d]", type, len));
  92                         break;
  93                 }
  94                 sp += (len - 3);
  95                 length -= (len - 3);
  96         }
  97         return;
  98 trunc:
  99         ND_PRINT((ndo, " [|msdp]"));
 100 }
 101
 102 /*
 103  * Local Variables:
 104  * c-style: whitesmith
 105  * c-basic-offset: 8
 106  * End:
 107  */