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 struct rip {
  43         u_int8_t rip_cmd;               /* request/response */
  44         u_int8_t rip_vers;              /* protocol version # */
  45         u_int8_t unused[2];             /* unused */
  46 };
  47
  48 #define RIPCMD_REQUEST          1       /* want info */
  49 #define RIPCMD_RESPONSE         2       /* responding to request */
  50 #define RIPCMD_TRACEON          3       /* turn tracing on */
  51 #define RIPCMD_TRACEOFF         4       /* turn it off */
  52 #define RIPCMD_POLL             5       /* want info from everybody */
  53 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  54
  55 static const struct tok rip_cmd_values[] = {
  56     { RIPCMD_REQUEST,           "Request" },
  57     { RIPCMD_RESPONSE,          "Response" },
  58     { RIPCMD_TRACEON,           "Trace on" },
  59     { RIPCMD_TRACEOFF,          "Trace off" },
  60     { RIPCMD_POLL,              "Poll" },
  61     { RIPCMD_POLLENTRY,         "Poll Entry" },
  62     { 0, NULL}
  63 };
  64
  65 #define RIP_AUTHLEN  16
  66 #define RIP_ROUTELEN 20
  67
  68 /*
  69  * rfc 1723
  70  *
  71  *  0                   1                   2                   3 3
  72  *  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
  73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  74  * | Command (1)   | Version (1)   |           unused              |
  75  * +---------------+---------------+-------------------------------+
  76  * | Address Family Identifier (2) |        Route Tag (2)          |
  77  * +-------------------------------+-------------------------------+
  78  * |                         IP Address (4)                        |
  79  * +---------------------------------------------------------------+
  80  * |                         Subnet Mask (4)                       |
  81  * +---------------------------------------------------------------+
  82  * |                         Next Hop (4)                          |
  83  * +---------------------------------------------------------------+
  84  * |                         Metric (4)                            |
  85  * +---------------------------------------------------------------+
  86  *
  87  */
  88
  89 struct rip_netinfo {
  90         u_int16_t rip_family;
  91         u_int16_t rip_tag;
  92         u_int32_t rip_dest;
  93         u_int32_t rip_dest_mask;
  94         u_int32_t rip_router;
  95         u_int32_t rip_metric;           /* cost of route */
  96 };
  97
  98 static void
  99 rip_entry_print_v1(register const struct rip_netinfo *ni)
 100 {
 101         register u_short family;
 102
 103         /* RFC 1058 */
 104         family = EXTRACT_16BITS(&ni->rip_family);
 105         if (family != BSD_AFNUM_INET && family != 0) {
 106                 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
 107                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 108                 return;
 109         }
 110         if (EXTRACT_16BITS(&ni->rip_tag) ||
 111             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 112             EXTRACT_32BITS(&ni->rip_router)) {
 113                 /* MBZ fields not zero */
 114                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 115                 return;
 116         }
 117         if (family == 0) {
 118                 printf("\n\t  AFI 0, %s, metric: %u",
 119                         ipaddr_string(&ni->rip_dest),
 120                         EXTRACT_32BITS(&ni->rip_metric));
 121                 return;
 122         } /* BSD_AFNUM_INET */
 123         printf("\n\t  %s, metric: %u",
 124                ipaddr_string(&ni->rip_dest),
 125                EXTRACT_32BITS(&ni->rip_metric));
 126 }
 127
 128 static void
 129 rip_entry_print_v2(register const struct rip_netinfo *ni)
 130 {
 131         register u_char *p;
 132         register u_short family;
 133         u_char buf[RIP_AUTHLEN];
 134
 135         family = EXTRACT_16BITS(&ni->rip_family);
 136         if (family == 0xFFFF) { /* 16 bytes authentication ? */
 137                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
 138                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 139                         buf[sizeof(buf)-1] = '\0';
 140                         for (p = buf; *p; p++) {
 141                                 if (!isprint(*p))
 142                                         break;
 143                         }
 144                         printf("\n\t  Simple Text Authentication data: %s", buf);
 145                 } else {
 146                         printf("\n\t  Unknown (%u) Authentication data:",
 147                                EXTRACT_16BITS(&ni->rip_tag));
 148                         print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",RIP_AUTHLEN);
 149                 }
 150         } else if (family != BSD_AFNUM_INET && family != 0) {
 151                 printf("\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
 152                 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
 153                 return;
 154         } else { /* BSD_AFNUM_INET or AFI 0 */
 155                 printf("\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 156                        tok2str(bsd_af_values, "%u", family),
 157                        ipaddr_string(&ni->rip_dest),
 158                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 159                        EXTRACT_16BITS(&ni->rip_tag),
 160                        EXTRACT_32BITS(&ni->rip_metric));
 161                 if (EXTRACT_32BITS(&ni->rip_router))
 162                         printf("%s", ipaddr_string(&ni->rip_router));
 163                 else
 164                     printf("self");
 165         }
 166 }
 167
 168 void
 169 rip_print(const u_char *dat, u_int length)
 170 {
 171         register const struct rip *rp;
 172         register const struct rip_netinfo *ni;
 173         register u_int i, j;
 174         register int trunc;
 175
 176         if (snapend < dat) {
 177                 printf(" [|rip]");
 178                 return;
 179         }
 180         i = snapend - dat;
 181         if (i > length)
 182                 i = length;
 183         if (i < sizeof(*rp)) {
 184                 printf(" [|rip]");
 185                 return;
 186         }
 187         i -= sizeof(*rp);
 188
 189         rp = (struct rip *)dat;
 190
 191         printf("%sRIPv%u",
 192                (vflag >= 1) ? "\n\t" : "",
 193                rp->rip_vers);
 194
 195         switch (rp->rip_vers) {
 196         case 0:
 197                 /*
 198                  * RFC 1058.
 199                  *
 200                  * XXX - RFC 1058 says
 201                  *
 202                  * 0  Datagrams whose version number is zero are to be ignored.
 203                  *    These are from a previous version of the protocol, whose
 204                  *    packet format was machine-specific.
 205                  *
 206                  * so perhaps we should just dump the packet, in hex.
 207                  */
 208                 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
 209                 break;
 210         default:
 211                 /* dump version and lets see if we know the commands name*/
 212                 printf(", %s, length: %u",
 213                        tok2str(rip_cmd_values,
 214                                "unknown command (%u)",
 215                                rp->rip_cmd),
 216                        length);
 217
 218                 if (vflag < 1)
 219                     return;
 220
 221                 switch (rp->rip_cmd) {
 222                 case RIPCMD_REQUEST:
 223                 case RIPCMD_RESPONSE:
 224                         j = length / sizeof(*ni);
 225                         printf(", routes: %u",j);
 226                         trunc = (i / sizeof(*ni)) != j;
 227                         ni = (struct rip_netinfo *)(rp + 1);
 228                         for (; i >= sizeof(*ni); ++ni) {
 229                                 if (rp->rip_vers == 1)
 230                                         rip_entry_print_v1(ni);
 231                                 else if (rp->rip_vers == 2)
 232                                         rip_entry_print_v2(ni);
 233                                 else
 234                                     break;
 235                                 i -= sizeof(*ni);
 236                         }
 237                         if (trunc)
 238                                 printf("[|rip]");
 239                         break;
 240
 241                 case RIPCMD_TRACEOFF:
 242                 case RIPCMD_POLL:
 243                 case RIPCMD_POLLENTRY:
 244                         break;
 245
 246                 case RIPCMD_TRACEON:
 247                     /* fall through */
 248                 default:
 249                     if (vflag <= 1) {
 250                         if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 251                             return;
 252                     }
 253                     break;
 254                 }
 255                 /* do we want to see an additionally hexdump ? */
 256                 if (vflag> 1) {
 257                     if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
 258                         return;
 259                 }
 260         }
 261 }
 262
 263