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 1.53 2002-11-09 17:19:30 itojun 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 } __attribute__((packed));
  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 } __attribute__((packed));
  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 (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
  87                 /* MBZ fields not zero */
  88                 printf(" [");
  89                 rip_printblk((u_char *)&ni->rip_family,
  90                              (u_char *)&ni->rip_metric +
  91                              sizeof(ni->rip_metric));
  92                 printf("]");
  93                 return;
  94         }
  95         printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
  96                EXTRACT_32BITS(&ni->rip_metric));
  97 }
  98
  99 static void
 100 rip_entry_print_v2(register const struct rip_netinfo *ni)
 101 {
 102         register u_char *p;
 103         register u_short family;
 104         u_char buf[RIP_AUTHLEN];
 105
 106         /* RFC 1723 */
 107         family = EXTRACT_16BITS(&ni->rip_family);
 108         if (family == 0xFFFF) {
 109                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
 110                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 111                         buf[sizeof(buf)-1] = '\0';
 112                         for (p = buf; *p; p++) {
 113                                 if (!isprint(*p))
 114                                         break;
 115                         }
 116                         if (!*p) {
 117                                 printf(" [password %s]", buf);
 118                         } else {
 119                                 printf(" [password: ");
 120                                 rip_printblk((u_char *)&ni->rip_dest,
 121                                              (u_char *)&ni->rip_metric +
 122                                              sizeof(ni->rip_metric));
 123                                 printf("]");
 124                         }
 125                 } else {
 126                         printf(" [auth %d:",
 127                                EXTRACT_16BITS(&ni->rip_tag));
 128                         rip_printblk((u_char *)&ni->rip_dest,
 129                                      (u_char *)&ni->rip_metric +
 130                                      sizeof(ni->rip_metric));
 131                         printf("]");
 132                 }
 133         } else if (family != AF_INET) {
 134                 printf(" [family %d:", family);
 135                 rip_printblk((u_char *)&ni->rip_tag,
 136                              (u_char *)&ni->rip_metric +
 137                              sizeof(ni->rip_metric));
 138                 printf("]");
 139                 return;
 140         } else { /* AF_INET */
 141                 printf(" {%s", ipaddr_string(&ni->rip_dest));
 142                 if (ni->rip_dest_mask)
 143                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
 144                 if (ni->rip_router)
 145                         printf("->%s", ipaddr_string(&ni->rip_router));
 146                 if (ni->rip_tag)
 147                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
 148                 printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
 149         }
 150 }
 151
 152 void
 153 rip_print(const u_char *dat, u_int length)
 154 {
 155         register const struct rip *rp;
 156         register const struct rip_netinfo *ni;
 157         register u_int i, j;
 158         register int trunc;
 159
 160         if (snapend < dat) {
 161                 printf(" [|rip]");
 162                 return;
 163         }
 164         i = snapend - dat;
 165         if (i > length)
 166                 i = length;
 167         if (i < sizeof(*rp)) {
 168                 printf(" [|rip]");
 169                 return;
 170         }
 171         i -= sizeof(*rp);
 172
 173         rp = (struct rip *)dat;
 174         switch (rp->rip_vers) {
 175         case 0:
 176                 /*
 177                  * RFC 1058.
 178                  *
 179                  * XXX - RFC 1058 says
 180                  *
 181                  * 0  Datagrams whose version number is zero are to be ignored.
 182                  *    These are from a previous version of the protocol, whose
 183                  *    packet format was machine-specific.
 184                  *
 185                  * so perhaps we should just dump the first few words of
 186                  * the packet, in hex.
 187                  */
 188                 printf(" RIPv0: ");
 189                 ni = (struct rip_netinfo *)(rp + 1);
 190                 rip_printblk((u_char *)&ni->rip_family,
 191                              (u_char *)&ni->rip_metric +
 192                              sizeof(ni->rip_metric));
 193                 break;
 194         default:
 195                 switch (rp->rip_cmd) {
 196                 case RIPCMD_REQUEST:
 197                         printf(" RIPv%d-req %d", rp->rip_vers, length);
 198                         break;
 199                 case RIPCMD_RESPONSE:
 200                         j = length / sizeof(*ni);
 201                         if (j * sizeof(*ni) + 4 != length)
 202                                 printf(" RIPv%d-resp [items %d] [%d]:",
 203                                        rp->rip_vers, j, length);
 204                         else
 205                                 printf(" RIPv%d-resp [items %d]:",
 206                                        rp->rip_vers, j);
 207                         trunc = (i / sizeof(*ni)) != j;
 208                         ni = (struct rip_netinfo *)(rp + 1);
 209                         for (; i >= sizeof(*ni); ++ni) {
 210                                 if (rp->rip_vers == 1)
 211                                         rip_entry_print_v1(ni);
 212                                 else
 213                                         rip_entry_print_v2(ni);
 214                                 i -= sizeof(*ni);
 215                         }
 216                         if (trunc)
 217                                 printf("[|rip]");
 218                         break;
 219                 case RIPCMD_TRACEON:
 220                         printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
 221                         (void)fn_print((const u_char *)(rp + 1), snapend);
 222                         fputs("\"", stdout);
 223                         break;
 224                 case RIPCMD_TRACEOFF:
 225                         printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
 226                         break;
 227                 case RIPCMD_POLL:
 228                         printf(" RIPv%d-poll %d", rp->rip_vers, length);
 229                         break;
 230                 case RIPCMD_POLLENTRY:
 231                         printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
 232                         break;
 233                 default:
 234                         printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
 235                                length);
 236                         break;
 237                 }
 238         }
 239 }