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