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 1.37 1999-10-17 21:37:15 mcr 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/udp.h>
  35
  36 #include <stdio.h>
  37
  38 #include "interface.h"
  39 #include "addrtoname.h"
  40 #include "extract.h"                    /* must come after interface.h */
  41
  42 struct rip {
  43         u_char rip_cmd;                 /* request/response */
  44         u_char rip_vers;                /* protocol version # */
  45         u_short rip_zero2;              /* unused */
  46 };
  47 #define RIPCMD_REQUEST          1       /* want info */
  48 #define RIPCMD_RESPONSE         2       /* responding to request */
  49 #define RIPCMD_TRACEON          3       /* turn tracing on */
  50 #define RIPCMD_TRACEOFF         4       /* turn it off */
  51 #define RIPCMD_POLL             5       /* want info from everybody */
  52 #define RIPCMD_POLLENTRY        6       /* poll for entry */
  53
  54 struct rip_netinfo {
  55         u_short rip_family;
  56         u_short rip_tag;
  57         u_int32_t rip_dest;
  58         u_int32_t rip_dest_mask;
  59         u_int32_t rip_router;
  60         u_int32_t rip_metric;           /* cost of route */
  61 };
  62
  63 static void
  64 rip_entry_print(register int vers, register const struct rip_netinfo *ni)
  65 {
  66         register u_char *cp, *ep;
  67
  68         if (EXTRACT_16BITS(&ni->rip_family) != AF_INET) {
  69
  70                 printf(" [family %d:", EXTRACT_16BITS(&ni->rip_family));
  71                 cp = (u_char *)&ni->rip_tag;
  72                 ep = (u_char *)&ni->rip_metric + sizeof(ni->rip_metric);
  73                 for (; cp < ep; cp += 2)
  74                         printf(" %04x", EXTRACT_16BITS(cp));
  75                 printf("]");
  76         } else if (vers < 2) {
  77                 /* RFC 1058 */
  78                 printf(" %s", ipaddr_string(&ni->rip_dest));
  79         } else {
  80                 /* RFC 1723 */
  81                 printf(" {%s", ipaddr_string(&ni->rip_dest));
  82                 if (ni->rip_dest_mask)
  83                         printf("/%s", ipaddr_string(&ni->rip_dest_mask));
  84                 if (ni->rip_router)
  85                         printf("->%s", ipaddr_string(&ni->rip_router));
  86                 if (ni->rip_tag)
  87                         printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
  88                 printf("}");
  89         }
  90         printf("(%d)", EXTRACT_32BITS(&ni->rip_metric));
  91 }
  92
  93 void
  94 rip_print(const u_char *dat, u_int length)
  95 {
  96         register const struct rip *rp;
  97         register const struct rip_netinfo *ni;
  98         register int i, j, trunc;
  99
 100         i = min(length, snapend - dat) - sizeof(*rp);
 101         if (i < 0)
 102                 return;
 103
 104         rp = (struct rip *)dat;
 105         switch (rp->rip_cmd) {
 106
 107         case RIPCMD_REQUEST:
 108                 printf(" rip-req %d", length);
 109                 break;
 110
 111         case RIPCMD_RESPONSE:
 112                 j = length / sizeof(*ni);
 113                 if (j * sizeof(*ni) != length - 4)
 114                         printf(" rip-resp %d[%d]:", j, length);
 115                 else
 116                         printf(" rip-resp %d:", j);
 117                 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
 118                 ni = (struct rip_netinfo *)(rp + 1);
 119                 for (; (i -= sizeof(*ni)) >= 0; ++ni)
 120                         rip_entry_print(rp->rip_vers, ni);
 121                 if (trunc)
 122                         printf("[|rip]");
 123                 break;
 124
 125         case RIPCMD_TRACEON:
 126                 printf(" rip-traceon %d: \"", length);
 127                 (void)fn_print((const u_char *)(rp + 1), snapend);
 128                 fputs("\"\n", stdout);
 129                 break;
 130
 131         case RIPCMD_TRACEOFF:
 132                 printf(" rip-traceoff %d", length);
 133                 break;
 134
 135         case RIPCMD_POLL:
 136                 printf(" rip-poll %d", length);
 137                 break;
 138
 139         case RIPCMD_POLLENTRY:
 140                 printf(" rip-pollentry %d", length);
 141                 break;
 142
 143         default:
 144                 printf(" rip-#%d %d", rp->rip_cmd, length);
 145                 break;
 146         }
 147         switch (rp->rip_vers) {
 148
 149         case 1:
 150         case 2:
 151                 break;
 152
 153         default:
 154                 printf(" [vers %d]", rp->rip_vers);
 155                 break;
 156         }
 157 }