GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/print-cdp.c Lines: 0 80 0.0 %
Date: 2017-11-13 Branches: 0 67 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: print-cdp.c,v 1.6 2016/03/29 04:07:50 canacar Exp $	*/
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/*
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 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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 *	The Regents of the University of California.  All rights reserved.
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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 distributions
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 * retain the above copyright notice and this paragraph in its entirety, (2)
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 * distributions including binary code include the above copyright notice and
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 * this paragraph in its entirety in the documentation or other materials
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 * provided with the distribution, and (3) all advertising materials mentioning
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 * features or use of this software display the following acknowledgement:
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 * ``This product includes software developed by the University of California,
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 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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 * the University nor the names of its contributors may be used to endorse
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 * or promote products derived from this software without specific prior
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 * written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 *
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 * Code by Gert Doering, SpaceNet GmbH, gert@space.net
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 *
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 * Reference documentation:
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 *    http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
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 */
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <netdb.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"			/* must come after interface.h */
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int cdp_print_addr(const u_char * p, int l);
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void cdp_print_prefixes(const u_char * p, int l);
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/*
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 * Returns non-zero IFF it succeeds in printing the header
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 */
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void
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cdp_print(const u_char *p, u_int length, u_int caplen,
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	  const u_char *esrc, const u_char *edst)
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{
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	int i;
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	int type, len;
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	/* Cisco Discovery Protocol */
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	if (caplen < 12) {
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		printf("[|cdp]");
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		return;
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	}
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	i=8;		/* CDP data starts at offset 8 */
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	printf("CDP v%d, ttl=%ds", p[i], p[i+1]);
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	i+=4;		/* skip version, TTL and chksum */
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	while (i < length) {
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		if (i + 4 > caplen) {
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			printf("[|cdp]");
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			return;
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		}
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		type = (p[i]<<8) + p[i+1];
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		len  = (p[i+2]<<8) + p[i+3];
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		if (vflag)
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			printf(" %02x/%02x", type, len);
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		if (len < 4)
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			goto error;
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		if (i+len > caplen) {
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			printf("[|cdp]");
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			return;
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		}
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		switch(type) {
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		case 0x01:
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			printf(" DevID '%.*s'", len - 4, p + i + 4);
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			break;
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		case 0x02:
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			printf(" Addr");
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			if (cdp_print_addr(p + i + 4, len - 4))
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				goto error;
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			break;
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		case 0x03:
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			printf(" PortID '%.*s'", len - 4, p + i + 4);
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			break;
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		case 0x04:
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			if (len < 8)
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				goto error;
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			printf(" CAP 0x%02x", (unsigned) p[i+7]);
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			break;
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		case 0x05:
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			if (vflag)
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				printf(" Version %.*s", len-4, p+i+4 );
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			else
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				printf(" Version (suppressed)" );
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			break;
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		case 0x06:
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			printf(" Platform '%.*s'", len-4, p+i+4 );
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			break;
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		case 0x07:
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			cdp_print_prefixes(p+i+4, len-4);
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			break;
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		case 0x09:		/* guess - not documented */
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			printf(" VTP-Management-Domain '%.*s'", len-4, p+i+4 );
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			break;
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		case 0x0a:		/* guess - not documented */
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			if (len < 6)
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				goto error;
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			printf(" Native-VLAN-ID %d", (p[i+4]<<8) + p[i+4+1] - 1 );
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			break;
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		case 0x0b:		/* guess - not documented */
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			if (len < 5)
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				goto error;
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			printf(" Duplex %s", p[i+4] ? "full": "half" );
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			break;
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		default:
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			printf(" unknown-type %02x len %d", type, len );
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		}
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		/* avoid infinite loop */
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		if (len == 0)
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			break;
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		i += len;
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	}
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error:
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	printf("[!cdp]");
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}
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#define CDP_CHECK_ACCESS(p, s) if ((endp - (p)) < (s)) return 1
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int
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cdp_print_addr(const u_char * p, int l)
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{
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	int pl, pt, al, num;
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	const u_char * endp = p+l;
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	CDP_CHECK_ACCESS(p, 4);
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	num = (p[0] << 24) + (p[1]<<16) + (p[2]<<8)+ p[3];
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	p+=4;
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	printf(" (%d): ", num);
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	while(p < endp && num >= 0) {
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		CDP_CHECK_ACCESS(p, 2);
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		pt=*p;
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		pl=*(p+1);
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		p+=2;
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		CDP_CHECK_ACCESS(p, 3);
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		/* special case: IPv4, protocol type=0xcc, addr. length=4 */
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		if (pl == 1 && *p == 0xcc && p[1] == 0 && p[2] == 4) {
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			p+=3;
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			CDP_CHECK_ACCESS(p, 4);
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			printf("IPv4 %d.%d.%d.%d ", p[0], p[1], p[2], p[3]);
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			p+=4;
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		} else {	/* generic case: just print raw data */
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			printf("pt=0x%02x, pl=%d, pb=", pt, pl);
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			CDP_CHECK_ACCESS(p, pl);
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			while(pl-- > 0)
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				printf(" %02x", *p++);
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			CDP_CHECK_ACCESS(p, 2);
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			al=(*p << 8) + *(p+1);
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			printf(", al=%d, a=", al);
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			p+=2;
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			CDP_CHECK_ACCESS(p, al);
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			while(al-- > 0)
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				printf(" %02x", *p++);
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		}
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		printf("  ");
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		num--;
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	}
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	return 0;
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}
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void
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cdp_print_prefixes(const u_char * p, int l)
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{
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	printf(" IPv4 Prefixes (%d):", l/5);
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	while (l > 0) {
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		if (l >= 5)
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			printf(" %d.%d.%d.%d/%d", p[0], p[1], p[2], p[3], p[4] );
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		l-=5; p+=5;
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	}
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}