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      1 /*
      2  * Copyright (c) 2000 William C. Fenner.
      3  *                All rights reserved.
      4  *
      5  * Kevin Steves <ks (at) hp.se> July 2000
      6  * Modified to:
      7  * - print version, type string and packet length
      8  * - print IP address count if > 1 (-v)
      9  * - verify checksum (-v)
     10  * - print authentication string (-v)
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that: (1) source code
     14  * distributions retain the above copyright notice and this paragraph
     15  * in its entirety, and (2) distributions including binary code include
     16  * the above copyright notice and this paragraph in its entirety in
     17  * the documentation or other materials provided with the distribution.
     18  * The name of William C. Fenner may not be used to endorse or
     19  * promote products derived from this software without specific prior
     20  * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
     21  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
     22  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     23  * FOR A PARTICULAR PURPOSE.
     24  */
     25 
     26 #ifndef lint
     27 static const char rcsid[] _U_ =
     28     "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.10 2005-05-06 07:56:54 guy Exp $";
     29 #endif
     30 
     31 #ifdef HAVE_CONFIG_H
     32 #include "config.h"
     33 #endif
     34 
     35 #include <tcpdump-stdinc.h>
     36 
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 
     40 #include "interface.h"
     41 #include "extract.h"
     42 #include "addrtoname.h"
     43 
     44 /*
     45  * RFC 2338:
     46  *     0                   1                   2                   3
     47  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     48  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     49  *    |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
     50  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     51  *    |   Auth Type   |   Adver Int   |          Checksum             |
     52  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     53  *    |                         IP Address (1)                        |
     54  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     55  *    |                            .                                  |
     56  *    |                            .                                  |
     57  *    |                            .                                  |
     58  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     59  *    |                         IP Address (n)                        |
     60  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     61  *    |                     Authentication Data (1)                   |
     62  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     63  *    |                     Authentication Data (2)                   |
     64  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     65  */
     66 
     67 /* Type */
     68 #define	VRRP_TYPE_ADVERTISEMENT	1
     69 
     70 static const struct tok type2str[] = {
     71 	{ VRRP_TYPE_ADVERTISEMENT,	"Advertisement"	},
     72 	{ 0,				NULL		}
     73 };
     74 
     75 /* Auth Type */
     76 #define	VRRP_AUTH_NONE		0
     77 #define	VRRP_AUTH_SIMPLE	1
     78 #define	VRRP_AUTH_AH		2
     79 
     80 static const struct tok auth2str[] = {
     81 	{ VRRP_AUTH_NONE,		"none"		},
     82 	{ VRRP_AUTH_SIMPLE,		"simple"	},
     83 	{ VRRP_AUTH_AH,			"ah"		},
     84 	{ 0,				NULL		}
     85 };
     86 
     87 void
     88 vrrp_print(register const u_char *bp, register u_int len, int ttl)
     89 {
     90 	int version, type, auth_type;
     91 	const char *type_s;
     92 
     93 	TCHECK(bp[0]);
     94 	version = (bp[0] & 0xf0) >> 4;
     95 	type = bp[0] & 0x0f;
     96 	type_s = tok2str(type2str, "unknown type (%u)", type);
     97 	printf("VRRPv%u, %s", version, type_s);
     98 	if (ttl != 255)
     99 		printf(", (ttl %u)", ttl);
    100 	if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
    101 		return;
    102 	TCHECK(bp[2]);
    103 	printf(", vrid %u, prio %u", bp[1], bp[2]);
    104 	TCHECK(bp[5]);
    105 	auth_type = bp[4];
    106 	printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
    107 	printf(", intvl %us, length %u", bp[5],len);
    108 	if (vflag) {
    109 		int naddrs = bp[3];
    110 		int i;
    111 		char c;
    112 
    113 		if (TTEST2(bp[0], len)) {
    114 			struct cksum_vec vec[1];
    115 
    116 			vec[0].ptr = bp;
    117 			vec[0].len = len;
    118 			if (in_cksum(vec, 1))
    119 				printf(", (bad vrrp cksum %x)",
    120 					EXTRACT_16BITS(&bp[6]));
    121 		}
    122 		printf(", addrs");
    123 		if (naddrs > 1)
    124 			printf("(%d)", naddrs);
    125 		printf(":");
    126 		c = ' ';
    127 		bp += 8;
    128 		for (i = 0; i < naddrs; i++) {
    129 			TCHECK(bp[3]);
    130 			printf("%c%s", c, ipaddr_string(bp));
    131 			c = ',';
    132 			bp += 4;
    133 		}
    134 		if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
    135 			TCHECK(bp[7]);
    136 			printf(" auth \"");
    137 			if (fn_printn(bp, 8, snapend)) {
    138 				printf("\"");
    139 				goto trunc;
    140 			}
    141 			printf("\"");
    142 		}
    143 	}
    144 	return;
    145 trunc:
    146 	printf("[|vrrp]");
    147 }
    148