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 1.39 1999-11-21 09:37:00 fenner 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 struct rip_netinfo {
  61         u_short rip_family;
  62         u_short rip_tag;
  63         u_int32_t rip_dest;
  64         u_int32_t rip_dest_mask;
  65         u_int32_t rip_router;
  66         u_int32_t rip_metric;           /* cost of route */
  67 };
  68
  69 static void
  70 rip_entry_print(register int vers, register const struct rip_netinfo *ni)
  71 {
  72         register u_char *cp, *ep;
  73
  74         if (EXTRACT_16BITS(&ni->rip_family) != AF_INET) {
  75
  76                 printf(" [family %d:", EXTRACT_16BITS(&ni->rip_family));
  77                 cp = (u_char *)&ni->rip_tag;
  78                 ep = (u_char *)&ni->rip_metric + sizeof(ni->rip_metric);
  79                 for (; cp < ep; cp += 2)
  80                         printf(" %04x", EXTRACT_16BITS(cp));
  81                 printf("]");
  82         } else if (vers < 2) {
  83                 /* RFC 1058 */
  84                 printf(" %s", ipaddr_string(&ni->rip_dest));
  85         } else {
  86                 /* RFC 1723 */
  87                 printf(" {%s", ipaddr_string(&ni->rip_dest));
  88                 if (ni->rip_dest_mask)
  89                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
  90                 if (ni->rip_router)
  91                         printf("->%s", ipaddr_string(&ni->rip_router));
  92                 if (ni->rip_tag)
  93                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
  94                 printf("}");
  95         }
  96         printf("(%d)", EXTRACT_32BITS(&ni->rip_metric));
  97 }
  98
  99 void
 100 rip_print(const u_char *dat, u_int length)
 101 {
 102         register const struct rip *rp;
 103         register const struct rip_netinfo *ni;
 104         register int i, j, trunc;
 105
 106         i = min(length, snapend - dat) - sizeof(*rp);
 107         if (i < 0)
 108                 return;
 109
 110         rp = (struct rip *)dat;
 111         switch (rp->rip_cmd) {
 112
 113         case RIPCMD_REQUEST:
 114                 printf(" rip-req %d", length);
 115                 break;
 116
 117         case RIPCMD_RESPONSE:
 118                 j = length / sizeof(*ni);
 119                 if (j * sizeof(*ni) != length - 4)
 120                         printf(" rip-resp %d[%d]:", j, length);
 121                 else
 122                         printf(" rip-resp %d:", j);
 123                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 124                 ni = (struct rip_netinfo *)(rp + 1);
 125                 for (; (i -= sizeof(*ni)) >= 0; ++ni)
 126                         rip_entry_print(rp->rip_vers, ni);
 127                 if (trunc)
 128                         printf("[|rip]");
 129                 break;
 130
 131         case RIPCMD_TRACEON:
 132                 printf(" rip-traceon %d: \"", length);
 133                 (void)fn_print((const u_char *)(rp + 1), snapend);
 134                 fputs("\"\n", stdout);
 135                 break;
 136
 137         case RIPCMD_TRACEOFF:
 138                 printf(" rip-traceoff %d", length);
 139                 break;
 140
 141         case RIPCMD_POLL:
 142                 printf(" rip-poll %d", length);
 143                 break;
 144
 145         case RIPCMD_POLLENTRY:
 146                 printf(" rip-pollentry %d", length);
 147                 break;
 148
 149         default:
 150                 printf(" rip-#%d %d", rp->rip_cmd, length);
 151                 break;
 152         }
 153         switch (rp->rip_vers) {
 154
 155         case 1:
 156         case 2:
 157                 break;
 158
 159         default:
 160                 printf(" [vers %d]", rp->rip_vers);
 161                 break;
 162         }
 163 }