dist/tcpdump/print-rip.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  */
  23
  24 #include <sys/cdefs.h>
  25 #ifndef lint
  26 #if 0
  27 static const char rcsid[] _U_ =
  28     "@(#) Header: /tcpdump/master/tcpdump/print-rip.c,v 1.57 2003/11/16 09:36:34 guy Exp (LBL)";
  29 #else
  30 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  31 #endif
  32 #endif
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #include <tcpdump-stdinc.h>
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "extract.h"                    /* must come after interface.h */
  46
  47 struct rip {
  48         u_int8_t rip_cmd;               /* request/response */
  49         u_int8_t rip_vers;              /* protocol version # */
  50         u_int8_t unused[2];             /* unused */
  51 };
  52
  53 #define RIPCMD_REQUEST          1       /* want info */
  54 #define RIPCMD_RESPONSE         2       /* responding to request */
  55 #define RIPCMD_TRACEON          3       /* turn tracing on */
  56 #define RIPCMD_TRACEOFF         4       /* turn it off */
  57 #define RIPCMD_POLL             5       /* want info from everybody */
  58 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  59
  60 static const struct tok rip_cmd_values[] = {
  61     { RIPCMD_REQUEST,           "Request" },
  62     { RIPCMD_RESPONSE,          "Response" },
  63     { RIPCMD_TRACEON,           "Trace on" },
  64     { RIPCMD_TRACEOFF,          "Trace off" },
  65     { RIPCMD_POLL,              "Poll" },
  66     { RIPCMD_POLLENTRY,         "Poll Entry" },
  67     { 0, NULL}
  68 };
  69
  70 #define RIP_AUTHLEN  16
  71 #define RIP_ROUTELEN 20
  72
  73 /*
  74  * rfc 1723
  75  *
  76  *  0                   1                   2                   3 3
  77  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  78  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79  * | Command (1)   | Version (1)   |           unused              |
  80  * +---------------+---------------+-------------------------------+
  81  * | Address Family Identifier (2) |        Route Tag (2)          |
  82  * +-------------------------------+-------------------------------+
  83  * |                         IP Address (4)                        |
  84  * +---------------------------------------------------------------+
  85  * |                         Subnet Mask (4)                       |
  86  * +---------------------------------------------------------------+
  87  * |                         Next Hop (4)                          |
  88  * +---------------------------------------------------------------+
  89  * |                         Metric (4)                            |
  90  * +---------------------------------------------------------------+
  91  *
  92  */
  93
  94 struct rip_netinfo {
  95         u_int16_t rip_family;
  96         u_int16_t rip_tag;
  97         u_int32_t rip_dest;
  98         u_int32_t rip_dest_mask;
  99         u_int32_t rip_router;
 100         u_int32_t rip_metric;           /* cost of route */
 101 };
 102
 103 static void
 104 rip_entry_print_v1(register const struct rip_netinfo *ni)
 105 {
 106         register u_short family;
 107
 108         /* RFC 1058 */
 109         family = EXTRACT_16BITS(&ni->rip_family);
 110         if (family != AF_INET) {
 111                 printf("\n\t AFI: %u:", family);
 112                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 113                 return;
 114         }
 115         if (EXTRACT_16BITS(&ni->rip_tag) ||
 116             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 117             EXTRACT_32BITS(&ni->rip_router)) {
 118                 /* MBZ fields not zero */
 119                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 120                 return;
 121         } /* AF_INET */
 122         printf("\n\t  %s, metric: %u",
 123                ipaddr_string(&ni->rip_dest),
 124                EXTRACT_32BITS(&ni->rip_metric));
 125 }
 126
 127 static void
 128 rip_entry_print_v2(register const struct rip_netinfo *ni)
 129 {
 130         register u_char *p;
 131         register u_short family;
 132         u_char buf[RIP_AUTHLEN];
 133
 134         family = EXTRACT_16BITS(&ni->rip_family);
 135         if (family == 0xFFFF) { /* 16 bytes authentication ? */
 136                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
 137                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 138                         buf[sizeof(buf)-1] = '\0';
 139                         for (p = buf; *p; p++) {
 140                                 if (!isprint(*p))
 141                                         break;
 142                         }
 143                         printf("\n\t  Simple Text Authentication data: %s", buf);
 144                 } else {
 145                         printf("\n\t  Unknown (%u) Authentication data:",
 146                                EXTRACT_16BITS(&ni->rip_tag));
 147                         print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",RIP_AUTHLEN);
 148                 }
 149         } else if (family != AF_INET) {
 150                 printf("\n\t  AFI: %u", family);
 151                 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
 152                 return;
 153         } else { /* AF_INET */
 154                 printf("\n\t  AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 155                        ipaddr_string(&ni->rip_dest),
 156                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 157                        EXTRACT_16BITS(&ni->rip_tag),
 158                        EXTRACT_32BITS(&ni->rip_metric));
 159                 if (EXTRACT_32BITS(&ni->rip_router))
 160                         printf("%s", ipaddr_string(&ni->rip_router));
 161                 else
 162                     printf("self");
 163         }
 164 }
 165
 166 void
 167 rip_print(const u_char *dat, u_int length)
 168 {
 169         register const struct rip *rp;
 170         register const struct rip_netinfo *ni;
 171         register u_int i, j;
 172         register int trunc;
 173
 174         if (snapend < dat) {
 175                 printf(" [|rip]");
 176                 return;
 177         }
 178         i = snapend - dat;
 179         if (i > length)
 180                 i = length;
 181         if (i < sizeof(*rp)) {
 182                 printf(" [|rip]");
 183                 return;
 184         }
 185         i -= sizeof(*rp);
 186
 187         rp = (struct rip *)dat;
 188
 189         printf("%sRIPv%u",
 190                (vflag >= 1) ? "\n\t" : "",
 191                rp->rip_vers);
 192
 193         switch (rp->rip_vers) {
 194         case 0:
 195                 /*
 196                  * RFC 1058.
 197                  *
 198                  * XXX - RFC 1058 says
 199                  *
 200                  * 0  Datagrams whose version number is zero are to be ignored.
 201                  *    These are from a previous version of the protocol, whose
 202                  *    packet format was machine-specific.
 203                  *
 204                  * so perhaps we should just dump the packet, in hex.
 205                  */
 206                 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
 207                 break;
 208         default:
 209                 /* dump version and lets see if we know the commands name*/
 210                 printf(", %s, length: %u",
 211                        tok2str(rip_cmd_values,
 212                                "unknown command (%u)",
 213                                rp->rip_cmd),
 214                        length);
 215
 216                 if (vflag < 1)
 217                     return;
 218
 219                 switch (rp->rip_cmd) {
 220                 case RIPCMD_RESPONSE:
 221                         j = length / sizeof(*ni);
 222                         printf(", routes: %u",j);
 223                         trunc = (i / sizeof(*ni)) != j;
 224                         ni = (struct rip_netinfo *)(rp + 1);
 225                         for (; i >= sizeof(*ni); ++ni) {
 226                                 if (rp->rip_vers == 1)
 227                                         rip_entry_print_v1(ni);
 228                                 else if (rp->rip_vers == 2)
 229                                         rip_entry_print_v2(ni);
 230                                 else
 231                                     break;
 232                                 i -= sizeof(*ni);
 233                         }
 234                         if (trunc)
 235                                 printf("[|rip]");
 236                         break;
 237
 238                 case RIPCMD_REQUEST:
 239                 case RIPCMD_TRACEOFF:
 240                 case RIPCMD_POLL:
 241                 case RIPCMD_POLLENTRY:
 242                         break;
 243
 244                 case RIPCMD_TRACEON:
 245                     /* fall through */
 246                 default:
 247                     if (vflag <= 1) {
 248                         if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 249                             return;
 250                     }
 251                     break;
 252                 }
 253                 /* do we want to see an additionally hexdump ? */
 254                 if (vflag> 1) {
 255                     if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 256                         return;
 257                 }
 258         }
 259 }
 260
 261