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83 lines
2.4 KiB
83 lines
2.4 KiB
/* $OpenBSD: print-carp.c,v 1.6 2009/10/27 23:59:55 deraadt Exp $ */ |
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/* |
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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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* Copyright (c) 2011 Advanced Computing Technologies |
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* George V. Neille-Neil |
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* |
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* Modified to: |
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* - work correctly with CARP |
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* - compile into the latest tcpdump |
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* - print out the counter |
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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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*/ |
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/* \summary: Common Address Redundancy Protocol (CARP) printer */ |
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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 <netdissect-stdinc.h> |
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#include "netdissect.h" /* for checksum structure and functions */ |
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#include "extract.h" |
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void |
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carp_print(netdissect_options *ndo, register const u_char *bp, register u_int len, int ttl) |
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{ |
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int version, type; |
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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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if (type == 1) |
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type_s = "advertise"; |
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else |
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type_s = "unknown"; |
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ND_PRINT((ndo, "CARPv%d-%s %d: ", version, type_s, len)); |
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if (ttl != 255) |
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ND_PRINT((ndo, "[ttl=%d!] ", ttl)); |
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if (version != 2 || type != 1) |
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return; |
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ND_TCHECK(bp[2]); |
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ND_TCHECK(bp[5]); |
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ND_PRINT((ndo, "vhid=%d advbase=%d advskew=%d authlen=%d ", |
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bp[1], bp[5], bp[2], bp[3])); |
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if (ndo->ndo_vflag) { |
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struct cksum_vec vec[1]; |
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vec[0].ptr = (const uint8_t *)bp; |
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vec[0].len = len; |
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if (ND_TTEST2(bp[0], len) && in_cksum(vec, 1)) |
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ND_PRINT((ndo, " (bad carp cksum %x!)", |
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EXTRACT_16BITS(&bp[6]))); |
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} |
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ND_PRINT((ndo, "counter=%" PRIu64, EXTRACT_64BITS(&bp[8]))); |
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return; |
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trunc: |
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ND_PRINT((ndo, "[|carp]")); |
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}
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