path: root/usr.sbin/tcpdump/print-lldp.c

/*	$OpenBSD: print-lldp.c,v 1.9 2016/11/28 17:47:15 jca Exp $	*/

/*
 * Copyright (c) 2006 Reyk Floeter <reyk@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/time.h>
#include <sys/socket.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <stdio.h>
#include <string.h>

#include "addrtoname.h"
#include "extract.h"
#include "interface.h"
#include "afnum.h"

enum {
	LLDP_TLV_END			= 0,
	LLDP_TLV_CHASSIS_ID		= 1,
	LLDP_TLV_PORT_ID		= 2,
	LLDP_TLV_TTL			= 3,
	LLDP_TLV_PORT_DESCR		= 4,
	LLDP_TLV_SYSTEM_NAME		= 5,
	LLDP_TLV_SYSTEM_DESCR		= 6,
	LLDP_TLV_SYSTEM_CAP		= 7,
	LLDP_TLV_MANAGEMENT_ADDR	= 8,
	LLDP_TLV_ORG			= 127
};

enum {
	LLDP_CHASSISID_SUBTYPE_CHASSIS	= 1,
	LLDP_CHASSISID_SUBTYPE_IFALIAS	= 2,
	LLDP_CHASSISID_SUBTYPE_PORT	= 3,
	LLDP_CHASSISID_SUBTYPE_LLADDR	= 4,
	LLDP_CHASSISID_SUBTYPE_ADDR	= 5,
	LLDP_CHASSISID_SUBTYPE_IFNAME	= 6,
	LLDP_CHASSISID_SUBTYPE_LOCAL	= 7
};

enum {
	LLDP_PORTID_SUBTYPE_IFALIAS	= 1,
	LLDP_PORTID_SUBTYPE_PORT	= 2,
	LLDP_PORTID_SUBTYPE_LLADDR	= 3,
	LLDP_PORTID_SUBTYPE_ADDR	= 4,
	LLDP_PORTID_SUBTYPE_IFNAME	= 5,
	LLDP_PORTID_SUBTYPE_AGENTCID	= 6,
	LLDP_PORTID_SUBTYPE_LOCAL	= 7
};

#define LLDP_CAP_OTHER          0x01
#define LLDP_CAP_REPEATER       0x02
#define LLDP_CAP_BRIDGE         0x04
#define LLDP_CAP_WLAN           0x08
#define LLDP_CAP_ROUTER         0x10
#define LLDP_CAP_TELEPHONE      0x20
#define LLDP_CAP_DOCSIS         0x40
#define LLDP_CAP_STATION        0x80
#define LLDP_CAP_BITS								\
	"\20\01OTHER\02REPEATER\03BRIDGE\04WLAN\05ROUTER\06TELEPHONE"		\
	"\07DOCSIS\10STATION"

enum {
	LLDP_MGMT_IFACE_UNKNOWN	= 1,
	LLDP_MGMT_IFACE_IFINDEX	= 2,
	LLDP_MGMT_IFACE_SYSPORT	= 3
};

static const char *afnumber[] = AFNUM_NAME_STR;

void		 lldp_print_str(u_int8_t *, int);
const char	*lldp_print_addr(int, const void *);
void		 lldp_print_id(int, u_int8_t *, int);

void
lldp_print_str(u_int8_t *str, int len)
{
	int i;
	printf("\"");
	for (i = 0; i < len; i++)
		printf("%c", isprint(str[i]) ? str[i] : '.');
	printf("\"");
}

const char *
lldp_print_addr(int af, const void *addr)
{
	static char buf[48];
	if (inet_ntop(af, addr, buf, sizeof(buf)) == NULL)
		return ("?");
	return (buf);
}

void
lldp_print_id(int type, u_int8_t *ptr, int len)
{
	u_int8_t id;
	u_int8_t *data;

	id = *(u_int8_t *)ptr;
	len -= sizeof(u_int8_t);
	data = ptr + sizeof(u_int8_t);
	if (len <= 0)
		return;

	if (type == LLDP_TLV_CHASSIS_ID) {
		switch (id) {
		case LLDP_CHASSISID_SUBTYPE_CHASSIS:
			printf("chassis ");
			lldp_print_str(data, len);
			break;
		case LLDP_CHASSISID_SUBTYPE_IFALIAS:
			printf("ifalias");
			break;
		case LLDP_CHASSISID_SUBTYPE_PORT:
			printf("port");
			break;
		case LLDP_CHASSISID_SUBTYPE_LLADDR:
			printf("lladdr %s", etheraddr_string(data));
			break;
		case LLDP_CHASSISID_SUBTYPE_ADDR:
			printf("addr");
			break;
		case LLDP_CHASSISID_SUBTYPE_IFNAME:
			printf("ifname ");
			lldp_print_str(data, len);
			break;
		case LLDP_CHASSISID_SUBTYPE_LOCAL:
			printf("local ");
			lldp_print_str(data, len);
			break;
		default:
			printf("unknown 0x%02x", id);
			break;
		}

	} else if (type == LLDP_TLV_PORT_ID) {
		switch (id) {
		case LLDP_PORTID_SUBTYPE_IFALIAS:
			printf("ifalias");
			break;
		case LLDP_PORTID_SUBTYPE_PORT:
			printf("port");
			break;
		case LLDP_PORTID_SUBTYPE_LLADDR:
			printf("lladdr %s", etheraddr_string(data));
			break;
		case LLDP_PORTID_SUBTYPE_ADDR:
			printf("addr");
			break;
		case LLDP_PORTID_SUBTYPE_IFNAME:
			printf("ifname ");
			lldp_print_str(data, len);
			break;
		case LLDP_PORTID_SUBTYPE_AGENTCID:
			printf("agentcid");
			break;
		case LLDP_PORTID_SUBTYPE_LOCAL:
			printf("local ");
			lldp_print_str(data, len);
			break;
		default:
			printf("unknown 0x%02x", id);
			break;
		}
	}
}

void
lldp_print(const u_char *p, u_int len)
{
	u_int16_t tlv;
	u_int8_t *ptr = (u_int8_t *)p, v = 0;
	int n, type, vlen, alen;

	printf("LLDP");

#define _ptrinc(_v)	ptr += (_v); vlen -= (_v);

	for (n = 0; n < len;) {
		TCHECK2(*ptr, sizeof(tlv));

		tlv = EXTRACT_16BITS(ptr);
		type = (tlv & 0xfe00) >> 9;
		vlen = tlv & 0x1ff;
		n += vlen;

		ptr += sizeof(tlv);
		TCHECK2(*ptr, vlen);

		switch (type) {
		case LLDP_TLV_END:
			goto done;
			break;

		case LLDP_TLV_CHASSIS_ID:
			printf(", ChassisId: ");
			lldp_print_id(type, ptr, vlen);
			break;

		case LLDP_TLV_PORT_ID:
			printf(", PortId: ");
			lldp_print_id(type, ptr, vlen);
			break;

		case LLDP_TLV_TTL:
			printf(", TTL: ");
			TCHECK2(*ptr, 2);
			printf("%ds", EXTRACT_16BITS(ptr));
			break;

		case LLDP_TLV_PORT_DESCR:
			printf(", PortDescr: ");
			lldp_print_str(ptr, vlen);
			break;

		case LLDP_TLV_SYSTEM_NAME:
			printf(", SysName: ");
			lldp_print_str(ptr, vlen);
			break;

		case LLDP_TLV_SYSTEM_DESCR:
			printf(", SysDescr: ");
			lldp_print_str(ptr, vlen);
			break;

		case LLDP_TLV_SYSTEM_CAP:
			printf(", CAP:");
			TCHECK2(*ptr, 4);
			printb(" available", EXTRACT_16BITS(ptr),
			    LLDP_CAP_BITS);
			_ptrinc(sizeof(u_int16_t));
			printb(" enabled", EXTRACT_16BITS(ptr),
			    LLDP_CAP_BITS);
			break;

		case LLDP_TLV_MANAGEMENT_ADDR:
			printf(", MgmtAddr:");
			TCHECK2(*ptr, 2);
			alen = *ptr - sizeof(u_int8_t);
			_ptrinc(sizeof(u_int8_t));
			v = *ptr;
			_ptrinc(sizeof(u_int8_t));
			if (v < AFNUM_MAX)
				printf(" %s", afnumber[v]);
			else
				printf(" type %d", v);
			TCHECK2(*ptr, alen);
			switch (v) {
			case AFNUM_INET:
				if (alen != sizeof(struct in_addr))
					goto trunc;
				printf(" %s",
				    lldp_print_addr(AF_INET, ptr));
				break;
			case AFNUM_INET6:
				if (alen != sizeof(struct in6_addr))
					goto trunc;
				printf(" %s",
				    lldp_print_addr(AF_INET6, ptr));
				break;
			}
			_ptrinc(alen);
			v = *(u_int8_t *)ptr;
			break;

		case LLDP_TLV_ORG:
			printf(", Org");
			break;

		default:
			printf(", type %d length %d", type, vlen);
			break;
		}
		ptr += vlen;
	}

 done:
	return;

 trunc:
	printf(" [|LLDP]");
}