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