NetBSD/usr.sbin/ldpd/tlv.c

76 lines
2.5 KiB
C

/* $NetBSD: tlv.c,v 1.1 2010/12/08 07:20:15 kefren Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mihai Chelaru <kefren@NetBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/stat.h>
#include <stdlib.h>
#include <strings.h>
#include <stdio.h>
#include "ldp.h"
#include "fsm.h"
#include "ldp_errors.h"
#include "tlv.h"
/* Reads and checks a tlv struct from a buffer */
struct hello_tlv *
get_hello_tlv(unsigned char *s, uint max)
{
struct hello_tlv *t;
/* Do we have at least Type + Length + MSG_ID ? */
if (max <= TLV_TYPE_LENGTH + MSGID_SIZE)
return NULL;
t = (struct hello_tlv *) s;
if (ntohs(t->type) != LDP_HELLO)
return NULL;
/* Does its size fit into max ? */
if (ntohs(t->length) + TLV_TYPE_LENGTH > max)
return NULL;
t->type = ntohs(t->type);
t->length = ntohs(t->length);
t->messageid = ntohl(t->messageid);
return t;
/* We don't check for Common Hello Params here */
}
/* Prints out some information about TLV */
void
debug_tlv(struct tlv * t)
{
warnp("TLV type %.4X, Length %d, Message ID %.8X\n", ntohs(t->type),
ntohs(t->length), ntohs(t->messageid));
}