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 1.38 1999-10-30 05:11:20 itojun Exp $ (LBL)";
  25 #endif
  26
  27 #include <sys/param.h>
  28 #include <sys/time.h>
  29 #include <sys/socket.h>
  30
  31 #include <netinet/in.h>
  32 #include <netinet/in_systm.h>
  33 #include <netinet/ip.h>
  34 #include <netinet/ip_var.h>
  35 #include <netinet/udp.h>
  36 #include <netinet/udp_var.h>
  37
  38 #include <stdio.h>
  39
  40 #include "interface.h"
  41 #include "addrtoname.h"
  42 #include "extract.h"                    /* must come after interface.h */
  43
  44 struct rip {
  45         u_char rip_cmd;                 /* request/response */
  46         u_char rip_vers;                /* protocol version # */
  47         u_short rip_zero2;              /* unused */
  48 };
  49 #define RIPCMD_REQUEST          1       /* want info */
  50 #define RIPCMD_RESPONSE         2       /* responding to request */
  51 #define RIPCMD_TRACEON          3       /* turn tracing on */
  52 #define RIPCMD_TRACEOFF         4       /* turn it off */
  53 #define RIPCMD_POLL             5       /* want info from everybody */
  54 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  55
  56 struct rip_netinfo {
  57         u_short rip_family;
  58         u_short rip_tag;
  59         u_int32_t rip_dest;
  60         u_int32_t rip_dest_mask;
  61         u_int32_t rip_router;
  62         u_int32_t rip_metric;           /* cost of route */
  63 };
  64
  65 static void
  66 rip_entry_print(register int vers, register const struct rip_netinfo *ni)
  67 {
  68         register u_char *cp, *ep;
  69
  70         if (EXTRACT_16BITS(&ni->rip_family) != AF_INET) {
  71
  72                 printf(" [family %d:", EXTRACT_16BITS(&ni->rip_family));
  73                 cp = (u_char *)&ni->rip_tag;
  74                 ep = (u_char *)&ni->rip_metric + sizeof(ni->rip_metric);
  75                 for (; cp < ep; cp += 2)
  76                         printf(" %04x", EXTRACT_16BITS(cp));
  77                 printf("]");
  78         } else if (vers < 2) {
  79                 /* RFC 1058 */
  80                 printf(" %s", ipaddr_string(&ni->rip_dest));
  81         } else {
  82                 /* RFC 1723 */
  83                 printf(" {%s", ipaddr_string(&ni->rip_dest));
  84                 if (ni->rip_dest_mask)
  85                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
  86                 if (ni->rip_router)
  87                         printf("->%s", ipaddr_string(&ni->rip_router));
  88                 if (ni->rip_tag)
  89                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
  90                 printf("}");
  91         }
  92         printf("(%d)", EXTRACT_32BITS(&ni->rip_metric));
  93 }
  94
  95 void
  96 rip_print(const u_char *dat, u_int length)
  97 {
  98         register const struct rip *rp;
  99         register const struct rip_netinfo *ni;
 100         register int i, j, trunc;
 101
 102         i = min(length, snapend - dat) - sizeof(*rp);
 103         if (i < 0)
 104                 return;
 105
 106         rp = (struct rip *)dat;
 107         switch (rp->rip_cmd) {
 108
 109         case RIPCMD_REQUEST:
 110                 printf(" rip-req %d", length);
 111                 break;
 112
 113         case RIPCMD_RESPONSE:
 114                 j = length / sizeof(*ni);
 115                 if (j * sizeof(*ni) != length - 4)
 116                         printf(" rip-resp %d[%d]:", j, length);
 117                 else
 118                         printf(" rip-resp %d:", j);
 119                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 120                 ni = (struct rip_netinfo *)(rp + 1);
 121                 for (; (i -= sizeof(*ni)) >= 0; ++ni)
 122                         rip_entry_print(rp->rip_vers, ni);
 123                 if (trunc)
 124                         printf("[|rip]");
 125                 break;
 126
 127         case RIPCMD_TRACEON:
 128                 printf(" rip-traceon %d: \"", length);
 129                 (void)fn_print((const u_char *)(rp + 1), snapend);
 130                 fputs("\"\n", stdout);
 131                 break;
 132
 133         case RIPCMD_TRACEOFF:
 134                 printf(" rip-traceoff %d", length);
 135                 break;
 136
 137         case RIPCMD_POLL:
 138                 printf(" rip-poll %d", length);
 139                 break;
 140
 141         case RIPCMD_POLLENTRY:
 142                 printf(" rip-pollentry %d", length);
 143                 break;
 144
 145         default:
 146                 printf(" rip-#%d %d", rp->rip_cmd, length);
 147                 break;
 148         }
 149         switch (rp->rip_vers) {
 150
 151         case 1:
 152         case 2:
 153                 break;
 154
 155         default:
 156                 printf(" [vers %d]", rp->rip_vers);
 157                 break;
 158         }
 159 }