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 1.43 2000-09-23 08:26:37 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34
  35 #include <netinet/in.h>
  36 #include <netinet/in_systm.h>
  37 #include <netinet/ip.h>
  38 #include <netinet/ip_var.h>
  39
  40 #include <stdio.h>
  41 #include <ctype.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "extract.h"                    /* must come after interface.h */
  46
  47 struct rip {
  48         u_char rip_cmd;                 /* request/response */
  49         u_char rip_vers;                /* protocol version # */
  50         u_short rip_zero2;              /* unused */
  51 };
  52 #define RIPCMD_REQUEST          1       /* want info */
  53 #define RIPCMD_RESPONSE         2       /* responding to request */
  54 #define RIPCMD_TRACEON          3       /* turn tracing on */
  55 #define RIPCMD_TRACEOFF         4       /* turn it off */
  56 #define RIPCMD_POLL             5       /* want info from everybody */
  57 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  58
  59 #define RIP_AUTHLEN 16
  60
  61 struct rip_netinfo {
  62         u_short rip_family;
  63         u_short rip_tag;
  64         u_int32_t rip_dest;
  65         u_int32_t rip_dest_mask;
  66         u_int32_t rip_router;
  67         u_int32_t rip_metric;           /* cost of route */
  68 };
  69
  70 static void
  71 rip_printblk(const u_char *cp, const u_char *ep)
  72 {
  73         for (; cp < ep; cp += 2)
  74                 printf(" %04x", EXTRACT_16BITS(cp));
  75         return;
  76 }
  77
  78 static void
  79 rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
  80 {
  81         register u_short family;
  82
  83         /* RFC 1058 */
  84         family = EXTRACT_16BITS(&ni->rip_family);
  85         if (family != AF_INET) {
  86                 printf(" [family %d:", family);
  87                 rip_printblk((u_char *)&ni->rip_tag,
  88                              (u_char *)&ni->rip_metric +
  89                              sizeof(ni->rip_metric));
  90                 printf("]");
  91                 return;
  92         }
  93         if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
  94                 /* MBZ fields not zero */
  95                 printf(" [");
  96                 rip_printblk((u_char *)&ni->rip_family,
  97                              (u_char *)&ni->rip_metric +
  98                              sizeof(ni->rip_metric));
  99                 printf("]");
 100                 return;
 101         }
 102         printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
 103                EXTRACT_32BITS(&ni->rip_metric));
 104 }
 105
 106 static void
 107 rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
 108 {
 109         register u_char *p;
 110         register u_short family;
 111         char buf[RIP_AUTHLEN];
 112
 113         /* RFC 1723 */
 114         family = EXTRACT_16BITS(&ni->rip_family);
 115         if (family == 0xFFFF) {
 116                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
 117                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 118                         buf[sizeof(buf)-1] = '\0';
 119                         for (p = buf; *p; p++) {
 120                                 if (!isprint(*p))
 121                                         break;
 122                         }
 123                         if (!*p) {
 124                                 printf(" [password %s]", buf);
 125                         } else {
 126                                 printf(" [password: ");
 127                                 rip_printblk((u_char *)&ni->rip_dest,
 128                                              (u_char *)&ni->rip_metric +
 129                                              sizeof(ni->rip_metric));
 130                                 printf("]");
 131                         }
 132                 } else {
 133                         printf(" [auth %d:",
 134                                EXTRACT_16BITS(&ni->rip_tag));
 135                         rip_printblk((u_char *)&ni->rip_dest,
 136                                      (u_char *)&ni->rip_metric +
 137                                      sizeof(ni->rip_metric));
 138                         printf("]");
 139                 }
 140         } else if (family != AF_INET) {
 141                 printf(" [family %d:", family);
 142                 rip_printblk((u_char *)&ni->rip_tag,
 143                              (u_char *)&ni->rip_metric +
 144                              sizeof(ni->rip_metric));
 145                 printf("]");
 146                 return;
 147         } else { /* AF_INET */
 148                 printf(" {%s", ipaddr_string(&ni->rip_dest));
 149                 if (ni->rip_dest_mask)
 150                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
 151                 if (ni->rip_router)
 152                         printf("->%s", ipaddr_string(&ni->rip_router));
 153                 if (ni->rip_tag)
 154                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
 155                 printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
 156         }
 157 }
 158
 159 void
 160 rip_print(const u_char *dat, u_int length)
 161 {
 162         register const struct rip *rp;
 163         register const struct rip_netinfo *ni;
 164         register int i, j, trunc;
 165
 166         i = min(length, snapend - dat) - sizeof(*rp);
 167         if (i < 0) {
 168                 printf(" [|rip]");
 169                 return;
 170         }
 171
 172         rp = (struct rip *)dat;
 173         switch (rp->rip_vers) {
 174         case 0:
 175                 /* RFC 1058 */
 176                 printf(" RIPv0: ");
 177                 rip_printblk((u_char *)&ni->rip_family,
 178                              (u_char *)&ni->rip_metric +
 179                              sizeof(ni->rip_metric));
 180                 break;
 181         default:
 182                 switch (rp->rip_cmd) {
 183                 case RIPCMD_REQUEST:
 184                         printf(" RIPv%d-req %d", rp->rip_vers, length);
 185                         break;
 186                 case RIPCMD_RESPONSE:
 187                         j = length / sizeof(*ni);
 188                         if (j * sizeof(*ni) != length - 4)
 189                                 printf(" RIPv%d-resp [items %d] [%d]:",
 190                                        rp->rip_vers, j, length);
 191                         else
 192                                 printf(" RIPv%d-resp [items %d]:",
 193                                        rp->rip_vers, j);
 194                         trunc = (i / sizeof(*ni)) != j;
 195                         ni = (struct rip_netinfo *)(rp + 1);
 196                         for (; (i -= sizeof(*ni)) >= 0; ++ni) {
 197                                 if (rp->rip_vers == 1)
 198                                         rip_entry_print_v1(rp->rip_vers, ni);
 199                                 else
 200                                         rip_entry_print_v2(rp->rip_vers, ni);
 201                         }
 202                         if (trunc)
 203                                 printf("[|rip]");
 204                         break;
 205                 case RIPCMD_TRACEON:
 206                         printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
 207                         (void)fn_print((const u_char *)(rp + 1), snapend);
 208                         fputs("\"\n", stdout);
 209                         break;
 210                 case RIPCMD_TRACEOFF:
 211                         printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
 212                         break;
 213                 case RIPCMD_POLL:
 214                         printf(" RIPv%d-poll %d", rp->rip_vers, length);
 215                         break;
 216                 case RIPCMD_POLLENTRY:
 217                         printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
 218                         break;
 219                 default:
 220                         printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
 221                                length);
 222                         break;
 223                 }
 224         }
 225 }