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 1.18 2005-01-04 00:15:54 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 #include <stdio.h>
  35
  36 #include "route6d.h"
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "extract.h"
  40
  41 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
  42 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
  43 {
  44     static const struct in6_addr in6addr_any;        /* :: */
  45     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
  46 }
  47 #endif
  48
  49 static int
  50 rip6_entry_print(register const struct netinfo6 *ni, int metric)
  51 {
  52         int l;
  53         l = printf("%s/%d", ip6addr_string(&ni->rip6_dest), ni->rip6_plen);
  54         if (ni->rip6_tag)
  55                 l += printf(" [%d]", EXTRACT_16BITS(&ni->rip6_tag));
  56         if (metric)
  57                 l += printf(" (%d)", ni->rip6_metric);
  58         return l;
  59 }
  60
  61 void
  62 ripng_print(const u_char *dat, unsigned int length)
  63 {
  64         register const struct rip6 *rp = (struct rip6 *)dat;
  65         register const struct netinfo6 *ni;
  66         register u_int amt;
  67         register u_int i;
  68         int j;
  69         int trunc;
  70
  71         if (snapend < dat)
  72                 return;
  73         amt = snapend - dat;
  74         i = min(length, amt);
  75         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
  76                 return;
  77         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
  78
  79         switch (rp->rip6_cmd) {
  80
  81         case RIP6_REQUEST:
  82                 j = length / sizeof(*ni);
  83                 if (j == 1
  84                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
  85                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
  86                         printf(" ripng-req dump");
  87                         break;
  88                 }
  89                 if (j * sizeof(*ni) != length - 4)
  90                         printf(" ripng-req %d[%u]:", j, length);
  91                 else
  92                         printf(" ripng-req %d:", j);
  93                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
  94                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
  95                     i -= sizeof(*ni), ++ni) {
  96                         if (vflag > 1)
  97                                 printf("\n\t");
  98                         else
  99                                 printf(" ");
 100                         rip6_entry_print(ni, 0);
 101                 }
 102                 break;
 103         case RIP6_RESPONSE:
 104                 j = length / sizeof(*ni);
 105                 if (j * sizeof(*ni) != length - 4)
 106                         printf(" ripng-resp %d[%u]:", j, length);
 107                 else
 108                         printf(" ripng-resp %d:", j);
 109                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 110                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 111                     i -= sizeof(*ni), ++ni) {
 112                         if (vflag > 1)
 113                                 printf("\n\t");
 114                         else
 115                                 printf(" ");
 116                         rip6_entry_print(ni, ni->rip6_metric);
 117                 }
 118                 if (trunc)
 119                         printf("[|ripng]");
 120                 break;
 121         default:
 122                 printf(" ripng-%d ?? %u", rp->rip6_cmd, length);
 123                 break;
 124         }
 125         if (rp->rip6_vers != RIP6_VERSION)
 126                 printf(" [vers %d]", rp->rip6_vers);
 127 }
 128 #endif /* INET6 */