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 1.42 2000-07-01 03:39:09 assar 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 #include <netinet/udp.h>
  40 #include <netinet/udp_var.h>
  41
  42 #include <stdio.h>
  43 #include <ctype.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47 #include "extract.h"                    /* must come after interface.h */
  48
  49 struct rip {
  50         u_char rip_cmd;                 /* request/response */
  51         u_char rip_vers;                /* protocol version # */
  52         u_short rip_zero2;              /* unused */
  53 };
  54 #define RIPCMD_REQUEST          1       /* want info */
  55 #define RIPCMD_RESPONSE         2       /* responding to request */
  56 #define RIPCMD_TRACEON          3       /* turn tracing on */
  57 #define RIPCMD_TRACEOFF         4       /* turn it off */
  58 #define RIPCMD_POLL             5       /* want info from everybody */
  59 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  60
  61 #define RIP_AUTHLEN 16
  62
  63 struct rip_netinfo {
  64         u_short rip_family;
  65         u_short rip_tag;
  66         u_int32_t rip_dest;
  67         u_int32_t rip_dest_mask;
  68         u_int32_t rip_router;
  69         u_int32_t rip_metric;           /* cost of route */
  70 };
  71
  72 static void
  73 rip_printblk(const u_char *cp, const u_char *ep)
  74 {
  75         for (; cp < ep; cp += 2)
  76                 printf(" %04x", EXTRACT_16BITS(cp));
  77         return;
  78 }
  79
  80 static void
  81 rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
  82 {
  83         register u_short family;
  84
  85         /* RFC 1058 */
  86         family = EXTRACT_16BITS(&ni->rip_family);
  87         if (family != AF_INET) {
  88                 printf(" [family %d:", family);
  89                 rip_printblk((u_char *)&ni->rip_tag,
  90                              (u_char *)&ni->rip_metric +
  91                              sizeof(ni->rip_metric));
  92                 printf("]");
  93                 return;
  94         }
  95         if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
  96                 /* MBZ fields not zero */
  97                 printf(" [");
  98                 rip_printblk((u_char *)&ni->rip_family,
  99                              (u_char *)&ni->rip_metric +
 100                              sizeof(ni->rip_metric));
 101                 printf("]");
 102                 return;
 103         }
 104         printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
 105                EXTRACT_32BITS(&ni->rip_metric));
 106 }
 107
 108 static void
 109 rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
 110 {
 111         register u_char *p;
 112         register u_short family;
 113         char buf[RIP_AUTHLEN];
 114
 115         /* RFC 1723 */
 116         family = EXTRACT_16BITS(&ni->rip_family);
 117         if (family == 0xFFFF) {
 118                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
 119                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 120                         buf[sizeof(buf)-1] = '\0';
 121                         for (p = buf; *p; p++) {
 122                                 if (!isprint(*p))
 123                                         break;
 124                         }
 125                         if (!*p) {
 126                                 printf(" [password %s]", buf);
 127                         } else {
 128                                 printf(" [password: ");
 129                                 rip_printblk((u_char *)&ni->rip_dest,
 130                                              (u_char *)&ni->rip_metric +
 131                                              sizeof(ni->rip_metric));
 132                                 printf("]");
 133                         }
 134                 } else {
 135                         printf(" [auth %d:",
 136                                EXTRACT_16BITS(&ni->rip_tag));
 137                         rip_printblk((u_char *)&ni->rip_dest,
 138                                      (u_char *)&ni->rip_metric +
 139                                      sizeof(ni->rip_metric));
 140                         printf("]");
 141                 }
 142         } else if (family != AF_INET) {
 143                 printf(" [family %d:", family);
 144                 rip_printblk((u_char *)&ni->rip_tag,
 145                              (u_char *)&ni->rip_metric +
 146                              sizeof(ni->rip_metric));
 147                 printf("]");
 148                 return;
 149         } else { /* AF_INET */
 150                 printf(" {%s", ipaddr_string(&ni->rip_dest));
 151                 if (ni->rip_dest_mask)
 152                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
 153                 if (ni->rip_router)
 154                         printf("->%s", ipaddr_string(&ni->rip_router));
 155                 if (ni->rip_tag)
 156                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
 157                 printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
 158         }
 159 }
 160
 161 void
 162 rip_print(const u_char *dat, u_int length)
 163 {
 164         register const struct rip *rp;
 165         register const struct rip_netinfo *ni;
 166         register int i, j, trunc;
 167
 168         i = min(length, snapend - dat) - sizeof(*rp);
 169         if (i < 0) {
 170                 printf(" [|rip]");
 171                 return;
 172         }
 173
 174         rp = (struct rip *)dat;
 175         switch (rp->rip_vers) {
 176         case 0:
 177                 /* RFC 1058 */
 178                 printf(" RIPv0: ");
 179                 rip_printblk((u_char *)&ni->rip_family,
 180                              (u_char *)&ni->rip_metric +
 181                              sizeof(ni->rip_metric));
 182                 break;
 183         default:
 184                 switch (rp->rip_cmd) {
 185                 case RIPCMD_REQUEST:
 186                         printf(" RIPv%d-req %d", rp->rip_vers, length);
 187                         break;
 188                 case RIPCMD_RESPONSE:
 189                         j = length / sizeof(*ni);
 190                         if (j * sizeof(*ni) != length - 4)
 191                                 printf(" RIPv%d-resp [items %d] [%d]:",
 192                                        rp->rip_vers, j, length);
 193                         else
 194                                 printf(" RIPv%d-resp [items %d]:",
 195                                        rp->rip_vers, j);
 196                         trunc = (i / sizeof(*ni)) != j;
 197                         ni = (struct rip_netinfo *)(rp + 1);
 198                         for (; (i -= sizeof(*ni)) >= 0; ++ni) {
 199                                 if (rp->rip_vers == 1)
 200                                         rip_entry_print_v1(rp->rip_vers, ni);
 201                                 else
 202                                         rip_entry_print_v2(rp->rip_vers, ni);
 203                         }
 204                         if (trunc)
 205                                 printf("[|rip]");
 206                         break;
 207                 case RIPCMD_TRACEON:
 208                         printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
 209                         (void)fn_print((const u_char *)(rp + 1), snapend);
 210                         fputs("\"\n", stdout);
 211                         break;
 212                 case RIPCMD_TRACEOFF:
 213                         printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
 214                         break;
 215                 case RIPCMD_POLL:
 216                         printf(" RIPv%d-poll %d", rp->rip_vers, length);
 217                         break;
 218                 case RIPCMD_POLLENTRY:
 219                         printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
 220                         break;
 221                 default:
 222                         printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
 223                                length);
 224                         break;
 225                 }
 226         }
 227 }