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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #ifdef INET6
  27
  28 #include <tcpdump-stdinc.h>
  29 #include <stdio.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"
  34
  35 /*
  36  * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. Neither the name of the project nor the names of its contributors
  48  *    may be used to endorse or promote products derived from this software
  49  *    without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  61  * SUCH DAMAGE.
  62  */
  63 #define RIP6_VERSION    1
  64
  65 #define RIP6_REQUEST    1
  66 #define RIP6_RESPONSE   2
  67
  68 struct netinfo6 {
  69         struct in6_addr rip6_dest;
  70         u_int16_t       rip6_tag;
  71         u_int8_t        rip6_plen;
  72         u_int8_t        rip6_metric;
  73 };
  74
  75 struct  rip6 {
  76         u_int8_t        rip6_cmd;
  77         u_int8_t        rip6_vers;
  78         u_int8_t        rip6_res1[2];
  79         union {
  80                 struct  netinfo6        ru6_nets[1];
  81                 char    ru6_tracefile[1];
  82         } rip6un;
  83 #define rip6_nets       rip6un.ru6_nets
  84 #define rip6_tracefile  rip6un.ru6_tracefile
  85 };
  86
  87 #define HOPCNT_INFINITY6        16
  88
  89 #define RIP6_PORT               521
  90
  91 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
  92 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
  93 {
  94     static const struct in6_addr in6addr_any;        /* :: */
  95     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
  96 }
  97 #endif
  98
  99 static int
 100 rip6_entry_print(register const struct netinfo6 *ni, int metric)
 101 {
 102         int l;
 103         l = printf("%s/%d", ip6addr_string(&ni->rip6_dest), ni->rip6_plen);
 104         if (ni->rip6_tag)
 105                 l += printf(" [%d]", EXTRACT_16BITS(&ni->rip6_tag));
 106         if (metric)
 107                 l += printf(" (%d)", ni->rip6_metric);
 108         return l;
 109 }
 110
 111 void
 112 ripng_print(const u_char *dat, unsigned int length)
 113 {
 114         register const struct rip6 *rp = (struct rip6 *)dat;
 115         register const struct netinfo6 *ni;
 116         register u_int amt;
 117         register u_int i;
 118         int j;
 119         int trunc;
 120
 121         if (snapend < dat)
 122                 return;
 123         amt = snapend - dat;
 124         i = min(length, amt);
 125         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 126                 return;
 127         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 128
 129         switch (rp->rip6_cmd) {
 130
 131         case RIP6_REQUEST:
 132                 j = length / sizeof(*ni);
 133                 if (j == 1
 134                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
 135                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 136                         printf(" ripng-req dump");
 137                         break;
 138                 }
 139                 if (j * sizeof(*ni) != length - 4)
 140                         printf(" ripng-req %d[%u]:", j, length);
 141                 else
 142                         printf(" ripng-req %d:", j);
 143                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 144                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 145                     i -= sizeof(*ni), ++ni) {
 146                         if (vflag > 1)
 147                                 printf("\n\t");
 148                         else
 149                                 printf(" ");
 150                         rip6_entry_print(ni, 0);
 151                 }
 152                 break;
 153         case RIP6_RESPONSE:
 154                 j = length / sizeof(*ni);
 155                 if (j * sizeof(*ni) != length - 4)
 156                         printf(" ripng-resp %d[%u]:", j, length);
 157                 else
 158                         printf(" ripng-resp %d:", j);
 159                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 160                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 161                     i -= sizeof(*ni), ++ni) {
 162                         if (vflag > 1)
 163                                 printf("\n\t");
 164                         else
 165                                 printf(" ");
 166                         rip6_entry_print(ni, ni->rip6_metric);
 167                 }
 168                 if (trunc)
 169                         printf("[|ripng]");
 170                 break;
 171         default:
 172                 printf(" ripng-%d ?? %u", rp->rip6_cmd, length);
 173                 break;
 174         }
 175         if (rp->rip6_vers != RIP6_VERSION)
 176                 printf(" [vers %d]", rp->rip6_vers);
 177 }
 178 #endif /* INET6 */