contrib/tcpdump/print-rip.c

   1 /*
   2  * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
   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-rip.c,v 1.57 2003/11/16 09:36:34 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"                    /* must come after interface.h */
  39
  40 struct rip {
  41         u_int8_t rip_cmd;               /* request/response */
  42         u_int8_t rip_vers;              /* protocol version # */
  43         u_int8_t unused[2];             /* unused */
  44 };
  45
  46 #define RIPCMD_REQUEST          1       /* want info */
  47 #define RIPCMD_RESPONSE         2       /* responding to request */
  48 #define RIPCMD_TRACEON          3       /* turn tracing on */
  49 #define RIPCMD_TRACEOFF         4       /* turn it off */
  50 #define RIPCMD_POLL             5       /* want info from everybody */
  51 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  52
  53 static const struct tok rip_cmd_values[] = {
  54     { RIPCMD_REQUEST,           "Request" },
  55     { RIPCMD_RESPONSE,          "Response" },
  56     { RIPCMD_TRACEON,           "Trace on" },
  57     { RIPCMD_TRACEOFF,          "Trace off" },
  58     { RIPCMD_POLL,              "Poll" },
  59     { RIPCMD_POLLENTRY,         "Poll Entry" },
  60     { 0, NULL}
  61 };
  62
  63 #define RIP_AUTHLEN  16
  64 #define RIP_ROUTELEN 20
  65
  66 /*
  67  * rfc 1723
  68  *
  69  *  0                   1                   2                   3 3
  70  *  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
  71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  72  * | Command (1)   | Version (1)   |           unused              |
  73  * +---------------+---------------+-------------------------------+
  74  * | Address Family Identifier (2) |        Route Tag (2)          |
  75  * +-------------------------------+-------------------------------+
  76  * |                         IP Address (4)                        |
  77  * +---------------------------------------------------------------+
  78  * |                         Subnet Mask (4)                       |
  79  * +---------------------------------------------------------------+
  80  * |                         Next Hop (4)                          |
  81  * +---------------------------------------------------------------+
  82  * |                         Metric (4)                            |
  83  * +---------------------------------------------------------------+
  84  *
  85  */
  86
  87 struct rip_netinfo {
  88         u_int16_t rip_family;
  89         u_int16_t rip_tag;
  90         u_int32_t rip_dest;
  91         u_int32_t rip_dest_mask;
  92         u_int32_t rip_router;
  93         u_int32_t rip_metric;           /* cost of route */
  94 };
  95
  96 static void
  97 rip_entry_print_v1(register const struct rip_netinfo *ni)
  98 {
  99         register u_short family;
 100
 101         /* RFC 1058 */
 102         family = EXTRACT_16BITS(&ni->rip_family);
 103         if (family != AF_INET) {
 104                 printf("\n\t AFI: %u:", family);
 105                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 106                 return;
 107         }
 108         if (EXTRACT_16BITS(&ni->rip_tag) ||
 109             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 110             EXTRACT_32BITS(&ni->rip_router)) {
 111                 /* MBZ fields not zero */
 112                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 113                 return;
 114         } /* AF_INET */
 115         printf("\n\t  %s, metric: %u",
 116                ipaddr_string(&ni->rip_dest),
 117                EXTRACT_32BITS(&ni->rip_metric));
 118 }
 119
 120 static void
 121 rip_entry_print_v2(register const struct rip_netinfo *ni)
 122 {
 123         register u_char *p;
 124         register u_short family;
 125         u_char buf[RIP_AUTHLEN];
 126
 127         family = EXTRACT_16BITS(&ni->rip_family);
 128         if (family == 0xFFFF) { /* 16 bytes authentication ? */
 129                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
 130                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 131                         buf[sizeof(buf)-1] = '\0';
 132                         for (p = buf; *p; p++) {
 133                                 if (!isprint(*p))
 134                                         break;
 135                         }
 136                         printf("\n\t  Simple Text Authentication data: %s", buf);
 137                 } else {
 138                         printf("\n\t  Unknown (%u) Authentication data:",
 139                                EXTRACT_16BITS(&ni->rip_tag));
 140                         print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",RIP_AUTHLEN);
 141                 }
 142         } else if (family != AF_INET) {
 143                 printf("\n\t  AFI: %u", family);
 144                 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
 145                 return;
 146         } else { /* AF_INET */
 147                 printf("\n\t  AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 148                        ipaddr_string(&ni->rip_dest),
 149                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 150                        EXTRACT_16BITS(&ni->rip_tag),
 151                        EXTRACT_32BITS(&ni->rip_metric));
 152                 if (EXTRACT_32BITS(&ni->rip_router))
 153                         printf("%s", ipaddr_string(&ni->rip_router));
 154                 else
 155                     printf("self");
 156         }
 157 }
 158
 159 void
 160 rip_print(const u_char *dat, u_int length)
 161 {
 162         register const struct rip *rp;
 163         register const struct rip_netinfo *ni;
 164         register u_int i, j;
 165         register int trunc;
 166
 167         if (snapend < dat) {
 168                 printf(" [|rip]");
 169                 return;
 170         }
 171         i = snapend - dat;
 172         if (i > length)
 173                 i = length;
 174         if (i < sizeof(*rp)) {
 175                 printf(" [|rip]");
 176                 return;
 177         }
 178         i -= sizeof(*rp);
 179
 180         rp = (struct rip *)dat;
 181
 182         printf("%sRIPv%u",
 183                (vflag >= 1) ? "\n\t" : "",
 184                rp->rip_vers);
 185
 186         switch (rp->rip_vers) {
 187         case 0:
 188                 /*
 189                  * RFC 1058.
 190                  *
 191                  * XXX - RFC 1058 says
 192                  *
 193                  * 0  Datagrams whose version number is zero are to be ignored.
 194                  *    These are from a previous version of the protocol, whose
 195                  *    packet format was machine-specific.
 196                  *
 197                  * so perhaps we should just dump the packet, in hex.
 198                  */
 199                 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
 200                 break;
 201         default:
 202                 /* dump version and lets see if we know the commands name*/
 203                 printf(", %s, length: %u",
 204                        tok2str(rip_cmd_values,
 205                                "unknown command (%u)",
 206                                rp->rip_cmd),
 207                        length);
 208
 209                 if (vflag < 1)
 210                     return;
 211
 212                 switch (rp->rip_cmd) {
 213                 case RIPCMD_RESPONSE:
 214                         j = length / sizeof(*ni);
 215                         printf(", routes: %u",j);
 216                         trunc = (i / sizeof(*ni)) != j;
 217                         ni = (struct rip_netinfo *)(rp + 1);
 218                         for (; i >= sizeof(*ni); ++ni) {
 219                                 if (rp->rip_vers == 1)
 220                                         rip_entry_print_v1(ni);
 221                                 else if (rp->rip_vers == 2)
 222                                         rip_entry_print_v2(ni);
 223                                 else
 224                                     break;
 225                                 i -= sizeof(*ni);
 226                         }
 227                         if (trunc)
 228                                 printf("[|rip]");
 229                         break;
 230
 231                 case RIPCMD_REQUEST:
 232                 case RIPCMD_TRACEOFF:
 233                 case RIPCMD_POLL:
 234                 case RIPCMD_POLLENTRY:
 235                         break;
 236
 237                 case RIPCMD_TRACEON:
 238                     /* fall through */
 239                 default:
 240                     if (vflag <= 1) {
 241                         if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 242                             return;
 243                     }
 244                     break;
 245                 }
 246                 /* do we want to see an additionally hexdump ? */
 247                 if (vflag> 1) {
 248                     if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 249                         return;
 250                 }
 251         }
 252 }
 253
 254