183 lines
6.2 KiB
C
183 lines
6.2 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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#define NETDISSECT_REWORKED
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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 "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ip.h"
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#include "ipproto.h"
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/*
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* RFC 2338 (VRRP v2):
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*
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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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*
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* RFC 5798 (VRRP v3):
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*
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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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* | IPv4 Fields or IPv6 Fields |
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* ... ...
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |(rsvd) | Max Adver Int | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | IPvX Address(es) |
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* + +
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* | |
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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(netdissect_options *ndo,
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register const u_char *bp, register u_int len,
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register const u_char *bp2, int ttl)
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{
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int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */
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const char *type_s;
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ND_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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ND_PRINT((ndo, "VRRPv%u, %s", version, type_s));
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if (ttl != 255)
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ND_PRINT((ndo, ", (ttl %u)", ttl));
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if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT)
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return;
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ND_TCHECK(bp[2]);
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ND_PRINT((ndo, ", vrid %u, prio %u", bp[1], bp[2]));
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ND_TCHECK(bp[5]);
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if (version == 2) {
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auth_type = bp[4];
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ND_PRINT((ndo, ", authtype %s", tok2str(auth2str, NULL, auth_type)));
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ND_PRINT((ndo, ", intvl %us, length %u", bp[5], len));
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} else { /* version == 3 */
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uint16_t intvl = (bp[4] & 0x0f) << 8 | bp[5];
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ND_PRINT((ndo, ", intvl %ucs, length %u", intvl, len));
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}
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if (ndo->ndo_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 (version == 2 && ND_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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ND_PRINT((ndo, ", (bad vrrp cksum %x)",
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EXTRACT_16BITS(&bp[6])));
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}
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if (version == 3 && ND_TTEST2(bp[0], len)) {
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uint16_t cksum = nextproto4_cksum(ndo, (struct ip *)bp2, bp,
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len, len, IPPROTO_VRRP);
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if (cksum)
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ND_PRINT((ndo, ", (bad vrrp cksum %x)",
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EXTRACT_16BITS(&bp[6])));
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}
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ND_PRINT((ndo, ", addrs"));
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if (naddrs > 1)
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ND_PRINT((ndo, "(%d)", naddrs));
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ND_PRINT((ndo, ":"));
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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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ND_TCHECK(bp[3]);
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ND_PRINT((ndo, "%c%s", c, ipaddr_string(ndo, bp)));
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c = ',';
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bp += 4;
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}
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if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
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ND_TCHECK(bp[7]);
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ND_PRINT((ndo, " auth \""));
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if (fn_printn(ndo, bp, 8, ndo->ndo_snapend)) {
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ND_PRINT((ndo, "\""));
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goto trunc;
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}
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ND_PRINT((ndo, "\""));
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}
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}
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return;
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trunc:
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ND_PRINT((ndo, "[|vrrp]"));
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}
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