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 #include <netdissect-stdinc.h>
  27
  28 #include "netdissect.h"
  29 #include "addrtoname.h"
  30 #include "extract.h"
  31
  32 /*
  33  * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. Neither the name of the project nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60 #define RIP6_VERSION    1
  61
  62 #define RIP6_REQUEST    1
  63 #define RIP6_RESPONSE   2
  64
  65 struct netinfo6 {
  66         struct in6_addr rip6_dest;
  67         uint16_t        rip6_tag;
  68         uint8_t         rip6_plen;
  69         uint8_t         rip6_metric;
  70 };
  71
  72 struct  rip6 {
  73         uint8_t         rip6_cmd;
  74         uint8_t         rip6_vers;
  75         uint8_t         rip6_res1[2];
  76         union {
  77                 struct  netinfo6        ru6_nets[1];
  78                 char    ru6_tracefile[1];
  79         } rip6un;
  80 #define rip6_nets       rip6un.ru6_nets
  81 #define rip6_tracefile  rip6un.ru6_tracefile
  82 };
  83
  84 #define HOPCNT_INFINITY6        16
  85
  86 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
  87 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
  88 {
  89     static const struct in6_addr in6addr_any;        /* :: */
  90     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
  91 }
  92 #endif
  93
  94 static int
  95 rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
  96 {
  97         int l;
  98         l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
  99         if (ni->rip6_tag)
 100                 l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
 101         if (metric)
 102                 l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
 103         return l;
 104 }
 105
 106 void
 107 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 108 {
 109         register const struct rip6 *rp = (const struct rip6 *)dat;
 110         register const struct netinfo6 *ni;
 111         register u_int amt;
 112         register u_int i;
 113         int j;
 114         int trunc;
 115
 116         if (ndo->ndo_snapend < dat)
 117                 return;
 118         amt = ndo->ndo_snapend - dat;
 119         i = min(length, amt);
 120         if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
 121                 return;
 122         i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
 123
 124         switch (rp->rip6_cmd) {
 125
 126         case RIP6_REQUEST:
 127                 j = length / sizeof(*ni);
 128                 if (j == 1
 129                     &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
 130                     &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
 131                         ND_PRINT((ndo, " ripng-req dump"));
 132                         break;
 133                 }
 134                 if (j * sizeof(*ni) != length - 4)
 135                         ND_PRINT((ndo, " ripng-req %d[%u]:", j, length));
 136                 else
 137                         ND_PRINT((ndo, " ripng-req %d:", j));
 138                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 139                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 140                     i -= sizeof(*ni), ++ni) {
 141                         if (ndo->ndo_vflag > 1)
 142                                 ND_PRINT((ndo, "\n\t"));
 143                         else
 144                                 ND_PRINT((ndo, " "));
 145                         rip6_entry_print(ndo, ni, 0);
 146                 }
 147                 break;
 148         case RIP6_RESPONSE:
 149                 j = length / sizeof(*ni);
 150                 if (j * sizeof(*ni) != length - 4)
 151                         ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
 152                 else
 153                         ND_PRINT((ndo, " ripng-resp %d:", j));
 154                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 155                 for (ni = rp->rip6_nets; i >= sizeof(*ni);
 156                     i -= sizeof(*ni), ++ni) {
 157                         if (ndo->ndo_vflag > 1)
 158                                 ND_PRINT((ndo, "\n\t"));
 159                         else
 160                                 ND_PRINT((ndo, " "));
 161                         rip6_entry_print(ndo, ni, ni->rip6_metric);
 162                 }
 163                 if (trunc)
 164                         ND_PRINT((ndo, "[|ripng]"));
 165                 break;
 166         default:
 167                 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
 168                 break;
 169         }
 170         if (rp->rip6_vers != RIP6_VERSION)
 171                 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
 172 }