| /* |
| * 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]"); |
| } |