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/*
* Copyright (c) 2000 William C. Fenner.
* All rights reserved.
*
* Kevin Steves <ks@hp.se> July 2000
* Modified to:
* - print version, type string and packet length
* - print IP address count if > 1 (-v)
* - verify checksum (-v)
* - print authentication string (-v)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* The name of William C. Fenner may not be used to endorse or
* promote products derived from this software without specific prior
* written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.10 2005-05-06 07:56:54 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <stdlib.h>
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
/*
* RFC 2338:
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Auth Type | Adver Int | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IP Address (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IP Address (n) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data (2) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* Type */
#define VRRP_TYPE_ADVERTISEMENT 1
static const struct tok type2str[] = {
{ VRRP_TYPE_ADVERTISEMENT, "Advertisement" },
{ 0, NULL }
};
/* Auth Type */
#define VRRP_AUTH_NONE 0
#define VRRP_AUTH_SIMPLE 1
#define VRRP_AUTH_AH 2
static const struct tok auth2str[] = {
{ VRRP_AUTH_NONE, "none" },
{ VRRP_AUTH_SIMPLE, "simple" },
{ VRRP_AUTH_AH, "ah" },
{ 0, NULL }
};
void
vrrp_print(register const u_char *bp, register u_int len, int ttl)
{
int version, type, auth_type;
const char *type_s;
TCHECK(bp[0]);
version = (bp[0] & 0xf0) >> 4;
type = bp[0] & 0x0f;
type_s = tok2str(type2str, "unknown type (%u)", type);
printf("VRRPv%u, %s", version, type_s);
if (ttl != 255)
printf(", (ttl %u)", ttl);
if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
return;
TCHECK(bp[2]);
printf(", vrid %u, prio %u", bp[1], bp[2]);
TCHECK(bp[5]);
auth_type = bp[4];
printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
printf(", intvl %us, length %u", bp[5],len);
if (vflag) {
int naddrs = bp[3];
int i;
char c;
if (TTEST2(bp[0], len)) {
struct cksum_vec vec[1];
vec[0].ptr = bp;
vec[0].len = len;
if (in_cksum(vec, 1))
printf(", (bad vrrp cksum %x)",
EXTRACT_16BITS(&bp[6]));
}
printf(", addrs");
if (naddrs > 1)
printf("(%d)", naddrs);
printf(":");
c = ' ';
bp += 8;
for (i = 0; i < naddrs; i++) {
TCHECK(bp[3]);
printf("%c%s", c, ipaddr_string(bp));
c = ',';
bp += 4;
}
if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
TCHECK(bp[7]);
printf(" auth \"");
if (fn_printn(bp, 8, snapend)) {
printf("\"");
goto trunc;
}
printf("\"");
}
}
return;
trunc:
printf("[|vrrp]");
}
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