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

   1 /*
   2  * Copyright (c) 1989, 1990, 1991, 1993, 1994
   3  *      The Regents of the University of California.  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 distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ripng.c,v 1.15.2.2 2003-11-16 08:51:42 guy Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #ifdef WIN32
  36 const struct in6_addr in6addr_any;        /* :: */
  37 #endif /* WIN32 */
  38
  39 #ifdef __MINGW32__
  40 int
  41 IN6_ADDR_EQUAL(const struct in6_addr *a, const struct in6_addr *b)
  42 {
  43     return (memcmp(a, b, sizeof(struct in6_addr)) == 0);
  44 }
  45
  46 #define IN6_IS_ADDR_UNSPECIFIED(a) IN6_ADDR_EQUAL((a), &in6addr_any)
  47
  48 #endif /* __MINGW32__ */
  49
  50 #include <stdio.h>
  51
  52 #include "route6d.h"
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "extract.h"
  56
  57 static int
  58 rip6_entry_print(register const struct netinfo6 *ni, int metric)
  59 {
  60         int l;
  61         l = printf("%s/%d", ip6addr_string(&ni->rip6_dest), ni->rip6_plen);
  62         if (ni->rip6_tag)
  63                 l += printf(" [%d]", EXTRACT_16BITS(&ni->rip6_tag));
  64         if (metric)
  65                 l += printf(" (%d)", ni->rip6_metric);
  66         return l;
  67 }
  68
  69 void
  70 ripng_print(const u_char *dat, unsigned int length)
  71 {
  72         register const struct rip6 *rp = (struct rip6 *)dat;
  73         register const struct netinfo6 *ni;
  74         register u_int amt;
  75         register u_int i;
  76         int j;
  77         int trunc;
  78
  79         if (snapend < dat)
  80                 return;
  81         amt = snapend - dat;
  82         i = min(length, amt);
  83         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
  84                 return;
  85         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
  86
  87         switch (rp->rip6_cmd) {
  88
  89         case RIP6_REQUEST:
  90                 j = length / sizeof(*ni);
  91                 if (j == 1
  92                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
  93                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
  94                         printf(" ripng-req dump");
  95                         break;
  96                 }
  97                 if (j * sizeof(*ni) != length - 4)
  98                         printf(" ripng-req %d[%u]:", j, length);
  99                 else
 100                         printf(" ripng-req %d:", j);
 101                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 102                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 103                     i -= sizeof(*ni), ++ni) {
 104                         if (vflag > 1)
 105                                 printf("\n\t");
 106                         else
 107                                 printf(" ");
 108                         rip6_entry_print(ni, 0);
 109                 }
 110                 break;
 111         case RIP6_RESPONSE:
 112                 j = length / sizeof(*ni);
 113                 if (j * sizeof(*ni) != length - 4)
 114                         printf(" ripng-resp %d[%u]:", j, length);
 115                 else
 116                         printf(" ripng-resp %d:", j);
 117                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 118                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 119                     i -= sizeof(*ni), ++ni) {
 120                         if (vflag > 1)
 121                                 printf("\n\t");
 122                         else
 123                                 printf(" ");
 124                         rip6_entry_print(ni, ni->rip6_metric);
 125                 }
 126                 if (trunc)
 127                         printf("[|ripng]");
 128                 break;
 129         default:
 130                 printf(" ripng-%d ?? %u", rp->rip6_cmd, length);
 131                 break;
 132         }
 133         if (rp->rip6_vers != RIP6_VERSION)
 134                 printf(" [vers %d]", rp->rip6_vers);
 135 }
 136 #endif /* INET6 */