mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* $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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#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" /* for checksum structure and functions */
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#include "netdissect.h"
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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 u_int8_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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