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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"                    /* must come after interface.h */
  34
  35 #include "af.h"
  36
  37 static const char tstr[] = "[|rip]";
  38
  39 struct rip {
  40         u_int8_t rip_cmd;               /* request/response */
  41         u_int8_t rip_vers;              /* protocol version # */
  42         u_int8_t unused[2];             /* unused */
  43 };
  44
  45 #define RIPCMD_REQUEST          1       /* want info */
  46 #define RIPCMD_RESPONSE         2       /* responding to request */
  47 #define RIPCMD_TRACEON          3       /* turn tracing on */
  48 #define RIPCMD_TRACEOFF         4       /* turn it off */
  49 #define RIPCMD_POLL             5       /* want info from everybody */
  50 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  51
  52 static const struct tok rip_cmd_values[] = {
  53     { RIPCMD_REQUEST,           "Request" },
  54     { RIPCMD_RESPONSE,          "Response" },
  55     { RIPCMD_TRACEON,           "Trace on" },
  56     { RIPCMD_TRACEOFF,          "Trace off" },
  57     { RIPCMD_POLL,              "Poll" },
  58     { RIPCMD_POLLENTRY,         "Poll Entry" },
  59     { 0, NULL}
  60 };
  61
  62 #define RIP_AUTHLEN  16
  63 #define RIP_ROUTELEN 20
  64
  65 /*
  66  * rfc 1723
  67  *
  68  *  0                   1                   2                   3 3
  69  *  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
  70  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  71  * | Command (1)   | Version (1)   |           unused              |
  72  * +---------------+---------------+-------------------------------+
  73  * | Address Family Identifier (2) |        Route Tag (2)          |
  74  * +-------------------------------+-------------------------------+
  75  * |                         IP Address (4)                        |
  76  * +---------------------------------------------------------------+
  77  * |                         Subnet Mask (4)                       |
  78  * +---------------------------------------------------------------+
  79  * |                         Next Hop (4)                          |
  80  * +---------------------------------------------------------------+
  81  * |                         Metric (4)                            |
  82  * +---------------------------------------------------------------+
  83  *
  84  */
  85
  86 struct rip_netinfo {
  87         u_int16_t rip_family;
  88         u_int16_t rip_tag;
  89         u_int32_t rip_dest;
  90         u_int32_t rip_dest_mask;
  91         u_int32_t rip_router;
  92         u_int32_t rip_metric;           /* cost of route */
  93 };
  94
  95 static void
  96 rip_entry_print_v1(register const struct rip_netinfo *ni)
  97 {
  98         register u_short family;
  99
 100         /* RFC 1058 */
 101         family = EXTRACT_16BITS(&ni->rip_family);
 102         if (family != BSD_AFNUM_INET && family != 0) {
 103                 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
 104                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 105                 return;
 106         }
 107         if (EXTRACT_16BITS(&ni->rip_tag) ||
 108             EXTRACT_32BITS(&ni->rip_dest_mask) ||
 109             EXTRACT_32BITS(&ni->rip_router)) {
 110                 /* MBZ fields not zero */
 111                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
 112                 return;
 113         }
 114         if (family == 0) {
 115                 printf("\n\t  AFI 0, %s, metric: %u",
 116                         ipaddr_string(&ni->rip_dest),
 117                         EXTRACT_32BITS(&ni->rip_metric));
 118                 return;
 119         } /* BSD_AFNUM_INET */
 120         printf("\n\t  %s, metric: %u",
 121                ipaddr_string(&ni->rip_dest),
 122                EXTRACT_32BITS(&ni->rip_metric));
 123 }
 124
 125 static unsigned
 126 rip_entry_print_v2(register const struct rip_netinfo *ni, const unsigned remaining)
 127 {
 128         register u_short family;
 129
 130         family = EXTRACT_16BITS(&ni->rip_family);
 131         if (family == 0xFFFF) { /* variable-sized authentication structures */
 132                 u_int16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
 133                 if (auth_type == 2) {
 134                         register u_char *p = (u_char *)&ni->rip_dest;
 135                         u_int i = 0;
 136                         printf("\n\t  Simple Text Authentication data: ");
 137                         for (; i < RIP_AUTHLEN; p++, i++)
 138                                 putchar (ND_ISPRINT(*p) ? *p : '.');
 139                 } else if (auth_type == 3) {
 140                         printf("\n\t  Auth header:");
 141                         printf(" Packet Len %u,", EXTRACT_16BITS((u_int8_t *)ni + 4));
 142                         printf(" Key-ID %u,", *((u_int8_t *)ni + 6));
 143                         printf(" Auth Data Len %u,", *((u_int8_t *)ni + 7));
 144                         printf(" SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask));
 145                         printf(" MBZ %u,", EXTRACT_32BITS(&ni->rip_router));
 146                         printf(" MBZ %u", EXTRACT_32BITS(&ni->rip_metric));
 147                 } else if (auth_type == 1) {
 148                         printf("\n\t  Auth trailer:");
 149                         print_unknown_data(gndo,(u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
 150                         return remaining; /* AT spans till the packet end */
 151                 } else {
 152                         printf("\n\t  Unknown (%u) Authentication data:",
 153                                EXTRACT_16BITS(&ni->rip_tag));
 154                         print_unknown_data(gndo,(u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
 155                 }
 156         } else if (family != BSD_AFNUM_INET && family != 0) {
 157                 printf("\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
 158                 print_unknown_data(gndo,(u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
 159         } else { /* BSD_AFNUM_INET or AFI 0 */
 160                 printf("\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
 161                        tok2str(bsd_af_values, "%u", family),
 162                        ipaddr_string(&ni->rip_dest),
 163                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
 164                        EXTRACT_16BITS(&ni->rip_tag),
 165                        EXTRACT_32BITS(&ni->rip_metric));
 166                 if (EXTRACT_32BITS(&ni->rip_router))
 167                         printf("%s", ipaddr_string(&ni->rip_router));
 168                 else
 169                     printf("self");
 170         }
 171         return sizeof (*ni);
 172 }
 173
 174 void
 175 rip_print(const u_char *dat, u_int length)
 176 {
 177         register const struct rip *rp;
 178         register const struct rip_netinfo *ni;
 179         register u_int i, j;
 180
 181         if (snapend < dat) {
 182                 printf(" %s", tstr);
 183                 return;
 184         }
 185         i = snapend - dat;
 186         if (i > length)
 187                 i = length;
 188         if (i < sizeof(*rp)) {
 189                 printf(" %s", tstr);
 190                 return;
 191         }
 192         i -= sizeof(*rp);
 193
 194         rp = (struct rip *)dat;
 195
 196         printf("%sRIPv%u",
 197                (vflag >= 1) ? "\n\t" : "",
 198                rp->rip_vers);
 199
 200         switch (rp->rip_vers) {
 201         case 0:
 202                 /*
 203                  * RFC 1058.
 204                  *
 205                  * XXX - RFC 1058 says
 206                  *
 207                  * 0  Datagrams whose version number is zero are to be ignored.
 208                  *    These are from a previous version of the protocol, whose
 209                  *    packet format was machine-specific.
 210                  *
 211                  * so perhaps we should just dump the packet, in hex.
 212                  */
 213                 print_unknown_data(gndo,(u_int8_t *)&rp->rip_cmd,"\n\t",length);
 214                 break;
 215         default:
 216                 /* dump version and lets see if we know the commands name*/
 217                 printf(", %s, length: %u",
 218                        tok2str(rip_cmd_values,
 219                                "unknown command (%u)",
 220                                rp->rip_cmd),
 221                        length);
 222
 223                 if (vflag < 1)
 224                     return;
 225
 226                 switch (rp->rip_cmd) {
 227                 case RIPCMD_REQUEST:
 228                 case RIPCMD_RESPONSE:
 229                         j = length / sizeof(*ni);
 230                         printf(", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "");
 231                         ni = (struct rip_netinfo *)(rp + 1);
 232                         for (; i >= sizeof(*ni); ++ni) {
 233                                 if (rp->rip_vers == 1)
 234                                 {
 235                                         rip_entry_print_v1(ni);
 236                                         i -= sizeof(*ni);
 237                                 }
 238                                 else if (rp->rip_vers == 2)
 239                                         i -= rip_entry_print_v2(ni, i);
 240                                 else
 241                                     break;
 242                         }
 243                         if (i)
 244                                 printf("%s", tstr);
 245                         break;
 246
 247                 case RIPCMD_TRACEOFF:
 248                 case RIPCMD_POLL:
 249                 case RIPCMD_POLLENTRY:
 250                         break;
 251
 252                 case RIPCMD_TRACEON:
 253                     /* fall through */
 254                 default:
 255                     if (vflag <= 1) {
 256                         if(!print_unknown_data(gndo,(u_int8_t *)rp,"\n\t",length))
 257                             return;
 258                     }
 259                     break;
 260                 }
 261                 /* do we want to see an additionally hexdump ? */
 262                 if (vflag> 1) {
 263                     if(!print_unknown_data(gndo,(u_int8_t *)rp,"\n\t",length))
 264                         return;
 265                 }
 266         }
 267 }
 268
 269