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print cisco cdp packets, from Gert Doering <gert@greenie.muc.de>

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assar 2000-05-15 00:41:06 +00:00
parent 10eaf5f59d
commit dec51d9f87
1 changed files with 160 additions and 0 deletions
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/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may 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.
*
* Code by Gert Doering, SpaceNet GmbH, gert@space.net
*
* Reference documentation:
* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.1 2000-05-15 00:41:06 assar Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <ctype.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
static void cdp_print_addr( const u_char * p, int l );
/*
* Returns non-zero IFF it succeeds in printing the header
*/
void
cdp_print(const u_char *p, u_int length, u_int caplen,
const u_char *esrc, const u_char *edst)
{
int i;
int type, len;
/* Cisco Discovery Protocol */
if ( caplen < 12 ) {
(void)printf("[|cdp]");
return;
}
i=8; /* CDP data starts at offset 8 */
printf ("CDP v%d, ttl=%ds", p[i], p[i+1] );
i+=4; /* skip version, TTL and chksum */
while (i < length) {
if ( i+4 > caplen ) {
printf("[!cdp]");
return;
}
type = (p[i]<<8) + p[i+1];
len = (p[i+2]<<8) + p[i+3];
if ( vflag )
printf( "\n\t%02x/%02x", type, len );
else
printf( "\n\t" );
if ( i+len > caplen ) {
printf("[!cdp]");
return;
}
switch( type )
{
case 0x01:
printf( " DevID '%.*s'", len-4, p+i+4 );
break;
case 0x02:
printf( " Addr" );
cdp_print_addr( p+i+4, len-4 );
break;
case 0x03:
printf( " PortID '%.*s'", len-4, p+i+4 );
break;
case 0x04:
printf( " CAP 0x%02x", (unsigned) p[i+7] );
break;
case 0x05:
if ( vflag )
printf( " Version:\n%.*s", len-4, p+i+4 );
else
printf( " Version: (suppressed)" );
break;
case 0x06:
printf( " Platform: '%.*s'", len-4, p+i+4 );
break;
default:
printf( " unknown field type %02x, len %d",
type, len );
}
i+=len;
}
}
static void
cdp_print_addr( const u_char * p, int l )
{
int pl, al, num;
const u_char * endp = p+l;
num = (p[0] << 24) + (p[1]<<16) + (p[2]<<8)+ p[3];
p+=4;
printf(" (%d): ", num );
while( p < endp && num >= 0) {
pl=*(p+1);
p+=2;
/* special case: IPv4, protocol type=0xcc, addr. length=4 */
if ( pl == 1 && *p == 0xcc &&
p[1] == 0 && p[2] == 4 ) {
p+=3;
printf( "IPv4 %d.%d.%d.%d ", p[0], p[1], p[2], p[3] );
p+=4;
} else { /* generic case: just print raw data */
printf("pt=0x%02x, pl=%d, pb=", *(p-2), pl);
while( pl-- > 0 )
printf( " %02x", *p++);
al=(*p << 8) + *(p+1);
printf( ", al=%d, a=", al );
p+=2;
while( al-- > 0 )
printf( " %02x", *p++);
}
printf(" ");
num--;
}
}