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 "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"
  39
  40 /*
  41  * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
  42  * All rights reserved.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  * 3. Neither the name of the project nor the names of its contributors
  53  *    may be used to endorse or promote products derived from this software
  54  *    without specific prior written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  66  * SUCH DAMAGE.
  67  */
  68 #define RIP6_VERSION    1
  69
  70 #define RIP6_REQUEST    1
  71 #define RIP6_RESPONSE   2
  72
  73 struct netinfo6 {
  74         struct in6_addr rip6_dest;
  75         u_int16_t       rip6_tag;
  76         u_int8_t        rip6_plen;
  77         u_int8_t        rip6_metric;
  78 };
  79
  80 struct  rip6 {
  81         u_int8_t        rip6_cmd;
  82         u_int8_t        rip6_vers;
  83         u_int8_t        rip6_res1[2];
  84         union {
  85                 struct  netinfo6        ru6_nets[1];
  86                 char    ru6_tracefile[1];
  87         } rip6un;
  88 #define rip6_nets       rip6un.ru6_nets
  89 #define rip6_tracefile  rip6un.ru6_tracefile
  90 };
  91
  92 #define HOPCNT_INFINITY6        16
  93
  94 #define RIP6_PORT               521
  95
  96 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
  97 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
  98 {
  99     static const struct in6_addr in6addr_any;        /* :: */
 100     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
 101 }
 102 #endif
 103
 104 static int
 105 rip6_entry_print(register const struct netinfo6 *ni, int metric)
 106 {
 107         int l;
 108         l = printf("%s/%d", ip6addr_string(&ni->rip6_dest), ni->rip6_plen);
 109         if (ni->rip6_tag)
 110                 l += printf(" [%d]", EXTRACT_16BITS(&ni->rip6_tag));
 111         if (metric)
 112                 l += printf(" (%d)", ni->rip6_metric);
 113         return l;
 114 }
 115
 116 void
 117 ripng_print(const u_char *dat, unsigned int length)
 118 {
 119         register const struct rip6 *rp = (struct rip6 *)dat;
 120         register const struct netinfo6 *ni;
 121         register u_int amt;
 122         register u_int i;
 123         int j;
 124         int trunc;
 125
 126         if (snapend < dat)
 127                 return;
 128         amt = snapend - dat;
 129         i = min(length, amt);
 130         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 131                 return;
 132         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 133
 134         switch (rp->rip6_cmd) {
 135
 136         case RIP6_REQUEST:
 137                 j = length / sizeof(*ni);
 138                 if (j == 1
 139                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
 140                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 141                         printf(" ripng-req dump");
 142                         break;
 143                 }
 144                 if (j * sizeof(*ni) != length - 4)
 145                         printf(" ripng-req %d[%u]:", j, length);
 146                 else
 147                         printf(" ripng-req %d:", j);
 148                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 149                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 150                     i -= sizeof(*ni), ++ni) {
 151                         if (vflag > 1)
 152                                 printf("\n\t");
 153                         else
 154                                 printf(" ");
 155                         rip6_entry_print(ni, 0);
 156                 }
 157                 break;
 158         case RIP6_RESPONSE:
 159                 j = length / sizeof(*ni);
 160                 if (j * sizeof(*ni) != length - 4)
 161                         printf(" ripng-resp %d[%u]:", j, length);
 162                 else
 163                         printf(" ripng-resp %d:", j);
 164                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 165                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 166                     i -= sizeof(*ni), ++ni) {
 167                         if (vflag > 1)
 168                                 printf("\n\t");
 169                         else
 170                                 printf(" ");
 171                         rip6_entry_print(ni, ni->rip6_metric);
 172                 }
 173                 if (trunc)
 174                         printf("[|ripng]");
 175                 break;
 176         default:
 177                 printf(" ripng-%d ?? %u", rp->rip6_cmd, length);
 178                 break;
 179         }
 180         if (rp->rip6_vers != RIP6_VERSION)
 181                 printf(" [vers %d]", rp->rip6_vers);
 182 }
 183 #endif /* INET6 */