/* $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 <[email protected]>
*
* 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));
}