/* * Copyright (c) 2000 William C. Fenner. * All rights reserved. * * Kevin Steves 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 1.9.2.1 2005/05/06 07:57:20 guy Exp $"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #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) && in_cksum((const u_short*)bp, len, 0)) 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]"); }