diff options
Diffstat (limited to 'contrib/tcpdump/print-cdp.c')
| -rw-r--r-- | contrib/tcpdump/print-cdp.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-cdp.c b/contrib/tcpdump/print-cdp.c new file mode 100644 index 0000000..53eff98 --- /dev/null +++ b/contrib/tcpdump/print-cdp.c @@ -0,0 +1,187 @@ +/* + * 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 1.4 2000/07/29 07:27:54 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 ); +static void cdp_print_prefixes( 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; + case 0x07: + cdp_print_prefixes( p+i+4, len-4 ); + break; + case 0x09: /* guess - not documented */ + printf( " VTP Management Domain: '%.*s'", len-4, p+i+4 ); + break; + case 0x0a: /* guess - not documented */ + printf( " Native VLAN ID: %d", (p[i+4]<<8) + p[i+4+1] - 1 ); + break; + case 0x0b: /* guess - not documented */ + printf( " Duplex: %s", p[i+4] ? "full": "half" ); + break; + default: + printf( " unknown field type %02x, len %d", type, len ); + } + + /* avoid infinite loop */ + if (len == 0) + break; + 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--; + } +} + + +static void +cdp_print_prefixes( const u_char * p, int l ) +{ + printf( " IPv4 Prefixes (%d):", l/5 ); + + while(l > 0) { + printf( " %d.%d.%d.%d/%d", p[0], p[1], p[2], p[3], p[4] ); + l-=5; p+=5; + } +} |
