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/*
* Copyright (c) 2000 Lennert Buytenhek
*
* This software may be distributed either under the terms of the
* BSD-style license that accompanies tcpdump or the GNU General
* Public License
*
* Format and print IEEE 802.1d spanning tree protocol packets.
* Contributed by Lennert Buytenhek <buytenh@gnu.org>
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.13.2.1 2005/04/26 07:27:17 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
static void
stp_print_bridge_id(const u_char *p)
{
printf("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
}
static void
stp_print_config_bpdu(const u_char *p)
{
printf("config ");
if (p[4] & 1)
printf("TOP_CHANGE ");
if (p[4] & 0x80)
printf("TOP_CHANGE_ACK ");
stp_print_bridge_id(p+17);
printf(".%.2x%.2x ", p[25], p[26]);
printf("root ");
stp_print_bridge_id(p+5);
printf(" pathcost %i ", (p[13] << 24) | (p[14] << 16) | (p[15] << 8) | p[16]);
printf("age %i ", p[27]);
printf("max %i ", p[29]);
printf("hello %i ", p[31]);
printf("fdelay %i ", p[33]);
}
static void
stp_print_tcn_bpdu(void)
{
printf("tcn");
}
/*
* Print 802.1d packets.
*/
void
stp_print(const u_char *p, u_int length)
{
if (length < 4)
goto trunc;
printf("802.1d ");
if (p[0] || p[1] || p[2]) {
printf("unknown version");
return;
}
switch (p[3])
{
case 0x00:
if (length < 10)
goto trunc;
stp_print_config_bpdu(p);
break;
case 0x80:
stp_print_tcn_bpdu();
break;
default:
printf("unknown type %i", p[3]);
break;
}
return;
trunc:
printf("[|stp %d]", length);
}
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