external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-rip.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <stdio.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"                    /* must come after interface.h */
  39
  40 #include "af.h"
  41
  42 static const char tstr[] = "[|rip]";
  43
  44 struct rip {
  45         uint8_t rip_cmd;                /* request/response */
  46         uint8_t rip_vers;               /* protocol version # */
  47         uint8_t unused[2];              /* unused */
  48 };
  49
  50 #define RIPCMD_REQUEST          1       /* want info */
  51 #define RIPCMD_RESPONSE         2       /* responding to request */
  52 #define RIPCMD_TRACEON          3       /* turn tracing on */
  53 #define RIPCMD_TRACEOFF         4       /* turn it off */
  54 #define RIPCMD_POLL             5       /* want info from everybody */
  55 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  56
  57 static const struct tok rip_cmd_values[] = {
  58     { RIPCMD_REQUEST,           "Request" },
  59     { RIPCMD_RESPONSE,          "Response" },
  60     { RIPCMD_TRACEON,           "Trace on" },
  61     { RIPCMD_TRACEOFF,          "Trace off" },
  62     { RIPCMD_POLL,              "Poll" },
  63     { RIPCMD_POLLENTRY,         "Poll Entry" },
  64     { 0, NULL}
  65 };
  66
  67 #define RIP_AUTHLEN  16
  68 #define RIP_ROUTELEN 20
  69
  70 /*
  71  * rfc 1723
  72  *
  73  *  0                   1                   2                   3 3
  74  *  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
  75  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  76  * | Command (1)   | Version (1)   |           unused              |
  77  * +---------------+---------------+-------------------------------+
  78  * | Address Family Identifier (2) |        Route Tag (2)          |
  79  * +-------------------------------+-------------------------------+
  80  * |                         IP Address (4)                        |
  81  * +---------------------------------------------------------------+
  82  * |                         Subnet Mask (4)                       |
  83  * +---------------------------------------------------------------+
  84  * |                         Next Hop (4)                          |
  85  * +---------------------------------------------------------------+
  86  * |                         Metric (4)                            |
  87  * +---------------------------------------------------------------+
  88  *
  89  */
  90
  91 struct rip_netinfo {
  92         uint16_t rip_family;
  93         uint16_t rip_tag;
  94         uint32_t rip_dest;
  95         uint32_t rip_dest_mask;
  96         uint32_t rip_router;
  97         uint32_t rip_metric;            /* cost of route */
  98 };
  99
 100 static void
 101 rip_entry_print_v1(netdissect_options *ndo,
 102                    register const struct rip_netinfo *ni)
 103 {
 104         register u_short family;
 105
 106         /* RFC 1058 */
 107         family = EXTRACT_16BITS(&ni->rip_family);
 108         if (family != BSD_AFNUM_INET && family != 0) {
 109                 ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)));
 110                 print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t  ", RIP_ROUTELEN);
 111                 return;
 112         }
 113         if (EXTRACT_16BITS(&ni->rip_tag) ||
 114             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 115             EXTRACT_32BITS(&ni->rip_router)) {
 116                 /* MBZ fields not zero */
 117                 print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t  ", RIP_ROUTELEN);
 118                 return;
 119         }
 120         if (family == 0) {
 121                 ND_PRINT((ndo, "\n\t  AFI 0, %s, metric: %u",
 122                         ipaddr_string(ndo, &ni->rip_dest),
 123                         EXTRACT_32BITS(&ni->rip_metric)));
 124                 return;
 125         } /* BSD_AFNUM_INET */
 126         ND_PRINT((ndo, "\n\t  %s, metric: %u",
 127                ipaddr_string(ndo, &ni->rip_dest),
 128                EXTRACT_32BITS(&ni->rip_metric)));
 129 }
 130
 131 static unsigned
 132 rip_entry_print_v2(netdissect_options *ndo,
 133                    register const struct rip_netinfo *ni, const unsigned remaining)
 134 {
 135         register u_short family;
 136
 137         family = EXTRACT_16BITS(&ni->rip_family);
 138         if (family == 0xFFFF) { /* variable-sized authentication structures */
 139                 uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
 140                 if (auth_type == 2) {
 141                         register u_char *p = (u_char *)&ni->rip_dest;
 142                         u_int i = 0;
 143                         ND_PRINT((ndo, "\n\t  Simple Text Authentication data: "));
 144                         for (; i < RIP_AUTHLEN; p++, i++)
 145                                 ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.'));
 146                 } else if (auth_type == 3) {
 147                         ND_PRINT((ndo, "\n\t  Auth header:"));
 148                         ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((uint8_t *)ni + 4)));
 149                         ND_PRINT((ndo, " Key-ID %u,", *((uint8_t *)ni + 6)));
 150                         ND_PRINT((ndo, " Auth Data Len %u,", *((uint8_t *)ni + 7)));
 151                         ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)));
 152                         ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router)));
 153                         ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric)));
 154                 } else if (auth_type == 1) {
 155                         ND_PRINT((ndo, "\n\t  Auth trailer:"));
 156                         print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t  ", remaining);
 157                         return remaining; /* AT spans till the packet end */
 158                 } else {
 159                         ND_PRINT((ndo, "\n\t  Unknown (%u) Authentication data:",
 160                                EXTRACT_16BITS(&ni->rip_tag)));
 161                         print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t  ", remaining);
 162                 }
 163         } else if (family != BSD_AFNUM_INET && family != 0) {
 164                 ND_PRINT((ndo, "\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)));
 165                 print_unknown_data(ndo, (uint8_t *)&ni->rip_tag, "\n\t  ", RIP_ROUTELEN-2);
 166         } else { /* BSD_AFNUM_INET or AFI 0 */
 167                 ND_PRINT((ndo, "\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 168                        tok2str(bsd_af_values, "%u", family),
 169                        ipaddr_string(ndo, &ni->rip_dest),
 170                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 171                        EXTRACT_16BITS(&ni->rip_tag),
 172                        EXTRACT_32BITS(&ni->rip_metric)));
 173                 if (EXTRACT_32BITS(&ni->rip_router))
 174                         ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router)));
 175                 else
 176                         ND_PRINT((ndo, "self"));
 177         }
 178         return sizeof (*ni);
 179 }
 180
 181 void
 182 rip_print(netdissect_options *ndo,
 183           const u_char *dat, u_int length)
 184 {
 185         register const struct rip *rp;
 186         register const struct rip_netinfo *ni;
 187         register u_int i, j;
 188
 189         if (ndo->ndo_snapend < dat) {
 190                 ND_PRINT((ndo, " %s", tstr));
 191                 return;
 192         }
 193         i = ndo->ndo_snapend - dat;
 194         if (i > length)
 195                 i = length;
 196         if (i < sizeof(*rp)) {
 197                 ND_PRINT((ndo, " %s", tstr));
 198                 return;
 199         }
 200         i -= sizeof(*rp);
 201
 202         rp = (struct rip *)dat;
 203
 204         ND_PRINT((ndo, "%sRIPv%u",
 205                (ndo->ndo_vflag >= 1) ? "\n\t" : "",
 206                rp->rip_vers));
 207
 208         switch (rp->rip_vers) {
 209         case 0:
 210                 /*
 211                  * RFC 1058.
 212                  *
 213                  * XXX - RFC 1058 says
 214                  *
 215                  * 0  Datagrams whose version number is zero are to be ignored.
 216                  *    These are from a previous version of the protocol, whose
 217                  *    packet format was machine-specific.
 218                  *
 219                  * so perhaps we should just dump the packet, in hex.
 220                  */
 221                 print_unknown_data(ndo, (uint8_t *)&rp->rip_cmd, "\n\t", length);
 222                 break;
 223         default:
 224                 /* dump version and lets see if we know the commands name*/
 225                 ND_PRINT((ndo, ", %s, length: %u",
 226                        tok2str(rip_cmd_values,
 227                                "unknown command (%u)",
 228                                rp->rip_cmd),
 229                        length));
 230
 231                 if (ndo->ndo_vflag < 1)
 232                     return;
 233
 234                 switch (rp->rip_cmd) {
 235                 case RIPCMD_REQUEST:
 236                 case RIPCMD_RESPONSE:
 237                         j = length / sizeof(*ni);
 238                         ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : ""));
 239                         ni = (struct rip_netinfo *)(rp + 1);
 240                         for (; i >= sizeof(*ni); ++ni) {
 241                                 if (rp->rip_vers == 1)
 242                                 {
 243                                         rip_entry_print_v1(ndo, ni);
 244                                         i -= sizeof(*ni);
 245                                 }
 246                                 else if (rp->rip_vers == 2)
 247                                         i -= rip_entry_print_v2(ndo, ni, i);
 248                                 else
 249                                     break;
 250                         }
 251                         if (i)
 252                                 ND_PRINT((ndo, "%s", tstr));
 253                         break;
 254
 255                 case RIPCMD_TRACEOFF:
 256                 case RIPCMD_POLL:
 257                 case RIPCMD_POLLENTRY:
 258                         break;
 259
 260                 case RIPCMD_TRACEON:
 261                     /* fall through */
 262                 default:
 263                     if (ndo->ndo_vflag <= 1) {
 264                         if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length))
 265                             return;
 266                     }
 267                     break;
 268                 }
 269                 /* do we want to see an additionally hexdump ? */
 270                 if (ndo->ndo_vflag> 1) {
 271                     if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length))
 272                         return;
 273                 }
 274         }
 275 }
 276
 277