The Tcpdump Group git mirrors - tcpdump/blob - 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 1.59 2006-03-23 14:58:44 hannes 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 #include "af.h"
  41
  42 static const char tstr[] = "[|rip]";
  43
  44 struct rip {
  45         u_int8_t rip_cmd;               /* request/response */
  46         u_int8_t rip_vers;              /* protocol version # */
  47         u_int8_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         u_int16_t rip_family;
  93         u_int16_t rip_tag;
  94         u_int32_t rip_dest;
  95         u_int32_t rip_dest_mask;
  96         u_int32_t rip_router;
  97         u_int32_t rip_metric;           /* cost of route */
  98 };
  99
 100 static void
 101 rip_entry_print_v1(register const struct rip_netinfo *ni)
 102 {
 103         register u_short family;
 104
 105         /* RFC 1058 */
 106         family = EXTRACT_16BITS(&ni->rip_family);
 107         if (family != BSD_AFNUM_INET && family != 0) {
 108                 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
 109                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 110                 return;
 111         }
 112         if (EXTRACT_16BITS(&ni->rip_tag) ||
 113             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 114             EXTRACT_32BITS(&ni->rip_router)) {
 115                 /* MBZ fields not zero */
 116                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 117                 return;
 118         }
 119         if (family == 0) {
 120                 printf("\n\t  AFI 0, %s, metric: %u",
 121                         ipaddr_string(&ni->rip_dest),
 122                         EXTRACT_32BITS(&ni->rip_metric));
 123                 return;
 124         } /* BSD_AFNUM_INET */
 125         printf("\n\t  %s, metric: %u",
 126                ipaddr_string(&ni->rip_dest),
 127                EXTRACT_32BITS(&ni->rip_metric));
 128 }
 129
 130 static unsigned
 131 rip_entry_print_v2(register const struct rip_netinfo *ni, const unsigned remaining)
 132 {
 133         register u_short family;
 134
 135         family = EXTRACT_16BITS(&ni->rip_family);
 136         if (family == 0xFFFF) { /* variable-sized authentication structures */
 137                 u_int16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
 138                 if (auth_type == 2) {
 139                         register u_char *p = (u_char *)&ni->rip_dest;
 140                         u_int i = 0;
 141                         printf("\n\t  Simple Text Authentication data: ");
 142                         for (; i < RIP_AUTHLEN; p++, i++)
 143                                 putchar (isprint(*p) ? *p : '.');
 144                 } else if (auth_type == 3) {
 145                         printf("\n\t  Auth header:");
 146                         printf(" Packet Len %u,", EXTRACT_16BITS((u_int8_t *)ni + 4));
 147                         printf(" Key-ID %u,", *((u_int8_t *)ni + 6));
 148                         printf(" Auth Data Len %u,", *((u_int8_t *)ni + 7));
 149                         printf(" SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask));
 150                         printf(" MBZ %u,", EXTRACT_32BITS(&ni->rip_router));
 151                         printf(" MBZ %u", EXTRACT_32BITS(&ni->rip_metric));
 152                 } else if (auth_type == 1) {
 153                         printf("\n\t  Auth trailer:");
 154                         print_unknown_data(gndo,(u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
 155                         return remaining; /* AT spans till the packet end */
 156                 } else {
 157                         printf("\n\t  Unknown (%u) Authentication data:",
 158                                EXTRACT_16BITS(&ni->rip_tag));
 159                         print_unknown_data(gndo,(u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
 160                 }
 161         } else if (family != BSD_AFNUM_INET && family != 0) {
 162                 printf("\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
 163                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
 164         } else { /* BSD_AFNUM_INET or AFI 0 */
 165                 printf("\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 166                        tok2str(bsd_af_values, "%u", family),
 167                        ipaddr_string(&ni->rip_dest),
 168                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 169                        EXTRACT_16BITS(&ni->rip_tag),
 170                        EXTRACT_32BITS(&ni->rip_metric));
 171                 if (EXTRACT_32BITS(&ni->rip_router))
 172                         printf("%s", ipaddr_string(&ni->rip_router));
 173                 else
 174                     printf("self");
 175         }
 176         return sizeof (*ni);
 177 }
 178
 179 void
 180 rip_print(const u_char *dat, u_int length)
 181 {
 182         register const struct rip *rp;
 183         register const struct rip_netinfo *ni;
 184         register u_int i, j;
 185
 186         if (snapend < dat) {
 187                 printf(" %s", tstr);
 188                 return;
 189         }
 190         i = snapend - dat;
 191         if (i > length)
 192                 i = length;
 193         if (i < sizeof(*rp)) {
 194                 printf(" %s", tstr);
 195                 return;
 196         }
 197         i -= sizeof(*rp);
 198
 199         rp = (struct rip *)dat;
 200
 201         printf("%sRIPv%u",
 202                (vflag >= 1) ? "\n\t" : "",
 203                rp->rip_vers);
 204
 205         switch (rp->rip_vers) {
 206         case 0:
 207                 /*
 208                  * RFC 1058.
 209                  *
 210                  * XXX - RFC 1058 says
 211                  *
 212                  * 0  Datagrams whose version number is zero are to be ignored.
 213                  *    These are from a previous version of the protocol, whose
 214                  *    packet format was machine-specific.
 215                  *
 216                  * so perhaps we should just dump the packet, in hex.
 217                  */
 218                 print_unknown_data(gndo,(u_int8_t *)&rp->rip_cmd,"\n\t",length);
 219                 break;
 220         default:
 221                 /* dump version and lets see if we know the commands name*/
 222                 printf(", %s, length: %u",
 223                        tok2str(rip_cmd_values,
 224                                "unknown command (%u)",
 225                                rp->rip_cmd),
 226                        length);
 227
 228                 if (vflag < 1)
 229                     return;
 230
 231                 switch (rp->rip_cmd) {
 232                 case RIPCMD_REQUEST:
 233                 case RIPCMD_RESPONSE:
 234                         j = length / sizeof(*ni);
 235                         printf(", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "");
 236                         ni = (struct rip_netinfo *)(rp + 1);
 237                         for (; i >= sizeof(*ni); ++ni) {
 238                                 if (rp->rip_vers == 1)
 239                                 {
 240                                         rip_entry_print_v1(ni);
 241                                         i -= sizeof(*ni);
 242                                 }
 243                                 else if (rp->rip_vers == 2)
 244                                         i -= rip_entry_print_v2(ni, i);
 245                                 else
 246                                     break;
 247                         }
 248                         if (i)
 249                                 printf("%s", tstr);
 250                         break;
 251
 252                 case RIPCMD_TRACEOFF:
 253                 case RIPCMD_POLL:
 254                 case RIPCMD_POLLENTRY:
 255                         break;
 256
 257                 case RIPCMD_TRACEON:
 258                     /* fall through */
 259                 default:
 260                     if (vflag <= 1) {
 261                         if(!print_unknown_data(gndo,(u_int8_t *)rp,"\n\t",length))
 262                             return;
 263                     }
 264                     break;
 265                 }
 266                 /* do we want to see an additionally hexdump ? */
 267                 if (vflag> 1) {
 268                     if(!print_unknown_data(gndo,(u_int8_t *)rp,"\n\t",length))
 269                         return;
 270                 }
 271         }
 272 }
 273
 274