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[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.54 2002-12-11 07:14:07 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_int16_t rip_zero2;            /* unused */
  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 #define RIP_AUTHLEN 16
  53
  54 struct rip_netinfo {
  55         u_int16_t rip_family;
  56         u_int16_t rip_tag;
  57         u_int32_t rip_dest;
  58         u_int32_t rip_dest_mask;
  59         u_int32_t rip_router;
  60         u_int32_t rip_metric;           /* cost of route */
  61 };
  62
  63 static void
  64 rip_printblk(const u_char *cp, const u_char *ep)
  65 {
  66         for (; cp < ep; cp += 2)
  67                 printf(" %04x", EXTRACT_16BITS(cp));
  68         return;
  69 }
  70
  71 static void
  72 rip_entry_print_v1(register const struct rip_netinfo *ni)
  73 {
  74         register u_short family;
  75
  76         /* RFC 1058 */
  77         family = EXTRACT_16BITS(&ni->rip_family);
  78         if (family != AF_INET) {
  79                 printf(" [family %d:", family);
  80                 rip_printblk((u_char *)&ni->rip_tag,
  81                              (u_char *)&ni->rip_metric +
  82                              sizeof(ni->rip_metric));
  83                 printf("]");
  84                 return;
  85         }
  86         if (EXTRACT_16BITS(&ni->rip_tag) ||
  87             EXTRACT_32BITS(&ni->rip_dest_mask) ||
  88             EXTRACT_32BITS(&ni->rip_router)) {
  89                 /* MBZ fields not zero */
  90                 printf(" [");
  91                 rip_printblk((u_char *)&ni->rip_family,
  92                              (u_char *)&ni->rip_metric +
  93                              sizeof(ni->rip_metric));
  94                 printf("]");
  95                 return;
  96         }
  97         printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
  98                EXTRACT_32BITS(&ni->rip_metric));
  99 }
 100
 101 static void
 102 rip_entry_print_v2(register const struct rip_netinfo *ni)
 103 {
 104         register u_char *p;
 105         register u_short family;
 106         u_char buf[RIP_AUTHLEN];
 107
 108         /* RFC 1723 */
 109         family = EXTRACT_16BITS(&ni->rip_family);
 110         if (family == 0xFFFF) {
 111                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
 112                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 113                         buf[sizeof(buf)-1] = '\0';
 114                         for (p = buf; *p; p++) {
 115                                 if (!isprint(*p))
 116                                         break;
 117                         }
 118                         if (!*p) {
 119                                 printf(" [password %s]", buf);
 120                         } else {
 121                                 printf(" [password: ");
 122                                 rip_printblk((u_char *)&ni->rip_dest,
 123                                              (u_char *)&ni->rip_metric +
 124                                              sizeof(ni->rip_metric));
 125                                 printf("]");
 126                         }
 127                 } else {
 128                         printf(" [auth %d:",
 129                                EXTRACT_16BITS(&ni->rip_tag));
 130                         rip_printblk((u_char *)&ni->rip_dest,
 131                                      (u_char *)&ni->rip_metric +
 132                                      sizeof(ni->rip_metric));
 133                         printf("]");
 134                 }
 135         } else if (family != AF_INET) {
 136                 printf(" [family %d:", family);
 137                 rip_printblk((u_char *)&ni->rip_tag,
 138                              (u_char *)&ni->rip_metric +
 139                              sizeof(ni->rip_metric));
 140                 printf("]");
 141                 return;
 142         } else { /* AF_INET */
 143                 printf(" {%s", ipaddr_string(&ni->rip_dest));
 144                 if (EXTRACT_32BITS(&ni->rip_dest_mask))
 145                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
 146                 if (EXTRACT_32BITS(&ni->rip_router))
 147                         printf("->%s", ipaddr_string(&ni->rip_router));
 148                 if (EXTRACT_16BITS(&ni->rip_tag))
 149                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
 150                 printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
 151         }
 152 }
 153
 154 void
 155 rip_print(const u_char *dat, u_int length)
 156 {
 157         register const struct rip *rp;
 158         register const struct rip_netinfo *ni;
 159         register u_int i, j;
 160         register int trunc;
 161
 162         if (snapend < dat) {
 163                 printf(" [|rip]");
 164                 return;
 165         }
 166         i = snapend - dat;
 167         if (i > length)
 168                 i = length;
 169         if (i < sizeof(*rp)) {
 170                 printf(" [|rip]");
 171                 return;
 172         }
 173         i -= sizeof(*rp);
 174
 175         rp = (struct rip *)dat;
 176         switch (rp->rip_vers) {
 177         case 0:
 178                 /*
 179                  * RFC 1058.
 180                  *
 181                  * XXX - RFC 1058 says
 182                  *
 183                  * 0  Datagrams whose version number is zero are to be ignored.
 184                  *    These are from a previous version of the protocol, whose
 185                  *    packet format was machine-specific.
 186                  *
 187                  * so perhaps we should just dump the first few words of
 188                  * the packet, in hex.
 189                  */
 190                 printf(" RIPv0: ");
 191                 ni = (struct rip_netinfo *)(rp + 1);
 192                 rip_printblk((u_char *)&ni->rip_family,
 193                              (u_char *)&ni->rip_metric +
 194                              sizeof(ni->rip_metric));
 195                 break;
 196         default:
 197                 switch (rp->rip_cmd) {
 198                 case RIPCMD_REQUEST:
 199                         printf(" RIPv%d-req %d", rp->rip_vers, length);
 200                         break;
 201                 case RIPCMD_RESPONSE:
 202                         j = length / sizeof(*ni);
 203                         if (j * sizeof(*ni) + 4 != length)
 204                                 printf(" RIPv%d-resp [items %d] [%d]:",
 205                                        rp->rip_vers, j, length);
 206                         else
 207                                 printf(" RIPv%d-resp [items %d]:",
 208                                        rp->rip_vers, j);
 209                         trunc = (i / sizeof(*ni)) != j;
 210                         ni = (struct rip_netinfo *)(rp + 1);
 211                         for (; i >= sizeof(*ni); ++ni) {
 212                                 if (rp->rip_vers == 1)
 213                                         rip_entry_print_v1(ni);
 214                                 else
 215                                         rip_entry_print_v2(ni);
 216                                 i -= sizeof(*ni);
 217                         }
 218                         if (trunc)
 219                                 printf("[|rip]");
 220                         break;
 221                 case RIPCMD_TRACEON:
 222                         printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
 223                         (void)fn_print((const u_char *)(rp + 1), snapend);
 224                         fputs("\"", stdout);
 225                         break;
 226                 case RIPCMD_TRACEOFF:
 227                         printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
 228                         break;
 229                 case RIPCMD_POLL:
 230                         printf(" RIPv%d-poll %d", rp->rip_vers, length);
 231                         break;
 232                 case RIPCMD_POLLENTRY:
 233                         printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
 234                         break;
 235                 default:
 236                         printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
 237                                length);
 238                         break;
 239                 }
 240         }
 241 }