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 1.41 2000-06-18 17:41:35 itojun 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
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46 #include "extract.h"                    /* must come after interface.h */
  47
  48 struct rip {
  49         u_char rip_cmd;                 /* request/response */
  50         u_char rip_vers;                /* protocol version # */
  51         u_short rip_zero2;              /* unused */
  52 };
  53 #define RIPCMD_REQUEST          1       /* want info */
  54 #define RIPCMD_RESPONSE         2       /* responding to request */
  55 #define RIPCMD_TRACEON          3       /* turn tracing on */
  56 #define RIPCMD_TRACEOFF         4       /* turn it off */
  57 #define RIPCMD_POLL             5       /* want info from everybody */
  58 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  59
  60 #define RIP_AUTHLEN 16
  61
  62 struct rip_netinfo {
  63         u_short rip_family;
  64         u_short rip_tag;
  65         u_int32_t rip_dest;
  66         u_int32_t rip_dest_mask;
  67         u_int32_t rip_router;
  68         u_int32_t rip_metric;           /* cost of route */
  69 };
  70
  71 static void
  72 rip_printblk(const u_char *cp, const u_char *ep)
  73 {
  74         for (; cp < ep; cp += 2)
  75                 printf(" %04x", EXTRACT_16BITS(cp));
  76         return;
  77 }
  78
  79 static void
  80 rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
  81 {
  82         register u_short family;
  83
  84         /* RFC 1058 */
  85         family = EXTRACT_16BITS(&ni->rip_family);
  86         if (family != AF_INET) {
  87                 printf(" [family %d:", family);
  88                 rip_printblk((u_char *)&ni->rip_tag,
  89                              (u_char *)&ni->rip_metric +
  90                              sizeof(ni->rip_metric));
  91                 printf("]");
  92                 return;
  93         }
  94         if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
  95                 /* MBZ fields not zero */
  96                 printf(" [");
  97                 rip_printblk((u_char *)&ni->rip_family,
  98                              (u_char *)&ni->rip_metric +
  99                              sizeof(ni->rip_metric));
 100                 printf("]");
 101                 return;
 102         }
 103         printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
 104                EXTRACT_32BITS(&ni->rip_metric));
 105 }
 106
 107 static void
 108 rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
 109 {
 110         register u_char *p;
 111         register u_short family;
 112         char buf[RIP_AUTHLEN];
 113
 114         /* RFC 1723 */
 115         family = EXTRACT_16BITS(&ni->rip_family);
 116         if (family == 0xFFFF) {
 117                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
 118                         memcpy(buf, &ni->rip_dest, sizeof(buf));
 119                         buf[sizeof(buf)-1] = '\0';
 120                         for (p = buf; *p; p++) {
 121                                 if (!isprint(*p))
 122                                         break;
 123                         }
 124                         if (!*p) {
 125                                 printf(" [password %s]", buf);
 126                         } else {
 127                                 printf(" [password: ");
 128                                 rip_printblk((u_char *)&ni->rip_dest,
 129                                              (u_char *)&ni->rip_metric +
 130                                              sizeof(ni->rip_metric));
 131                                 printf("]");
 132                         }
 133                 } else {
 134                         printf(" [auth %d:",
 135                                EXTRACT_16BITS(&ni->rip_tag));
 136                         rip_printblk((u_char *)&ni->rip_dest,
 137                                      (u_char *)&ni->rip_metric +
 138                                      sizeof(ni->rip_metric));
 139                         printf("]");
 140                 }
 141         } else if (family != AF_INET) {
 142                 printf(" [family %d:", family);
 143                 rip_printblk((u_char *)&ni->rip_tag,
 144                              (u_char *)&ni->rip_metric +
 145                              sizeof(ni->rip_metric));
 146                 printf("]");
 147                 return;
 148         } else { /* AF_INET */
 149                 printf(" {%s", ipaddr_string(&ni->rip_dest));
 150                 if (ni->rip_dest_mask)
 151                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
 152                 if (ni->rip_router)
 153                         printf("->%s", ipaddr_string(&ni->rip_router));
 154                 if (ni->rip_tag)
 155                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
 156                 printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
 157         }
 158 }
 159
 160 void
 161 rip_print(const u_char *dat, u_int length)
 162 {
 163         register const struct rip *rp;
 164         register const struct rip_netinfo *ni;
 165         register int i, j, trunc;
 166
 167         i = min(length, snapend - dat) - sizeof(*rp);
 168         if (i < 0) {
 169                 printf(" [|rip]");
 170                 return;
 171         }
 172
 173         rp = (struct rip *)dat;
 174         switch (rp->rip_vers) {
 175         case 0:
 176                 /* RFC 1058 */
 177                 printf(" RIPv0: ");
 178                 rip_printblk((u_char *)&ni->rip_family,
 179                              (u_char *)&ni->rip_metric +
 180                              sizeof(ni->rip_metric));
 181                 break;
 182         default:
 183                 switch (rp->rip_cmd) {
 184                 case RIPCMD_REQUEST:
 185                         printf(" RIPv%d-req %d", rp->rip_vers, length);
 186                         break;
 187                 case RIPCMD_RESPONSE:
 188                         j = length / sizeof(*ni);
 189                         if (j * sizeof(*ni) != length - 4)
 190                                 printf(" RIPv%d-resp [items %d] [%d]:",
 191                                        rp->rip_vers, j, length);
 192                         else
 193                                 printf(" RIPv%d-resp [items %d]:",
 194                                        rp->rip_vers, j);
 195                         trunc = (i / sizeof(*ni)) != j;
 196                         ni = (struct rip_netinfo *)(rp + 1);
 197                         for (; (i -= sizeof(*ni)) >= 0; ++ni) {
 198                                 if (rp->rip_vers == 1)
 199                                         rip_entry_print_v1(rp->rip_vers, ni);
 200                                 else
 201                                         rip_entry_print_v2(rp->rip_vers, ni);
 202                         }
 203                         if (trunc)
 204                                 printf("[|rip]");
 205                         break;
 206                 case RIPCMD_TRACEON:
 207                         printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
 208                         (void)fn_print((const u_char *)(rp + 1), snapend);
 209                         fputs("\"\n", stdout);
 210                         break;
 211                 case RIPCMD_TRACEOFF:
 212                         printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
 213                         break;
 214                 case RIPCMD_POLL:
 215                         printf(" RIPv%d-poll %d", rp->rip_vers, length);
 216                         break;
 217                 case RIPCMD_POLLENTRY:
 218                         printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
 219                         break;
 220                 default:
 221                         printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
 222                                length);
 223                         break;
 224                 }
 225         }
 226 }