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      1 /* $NetBSD: tlv.c,v 1.1 2010/12/08 07:20:15 kefren Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mihai Chelaru <kefren (at) NetBSD.org>
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/stat.h>
     33 
     34 #include <stdlib.h>
     35 #include <strings.h>
     36 #include <stdio.h>
     37 
     38 #include "ldp.h"
     39 #include "fsm.h"
     40 #include "ldp_errors.h"
     41 #include "tlv.h"
     42 
     43 /* Reads and checks a tlv struct from a buffer */
     44 struct hello_tlv *
     45 get_hello_tlv(unsigned char *s, uint max)
     46 {
     47 	struct hello_tlv *t;
     48 
     49 	/* Do we have at least Type + Length + MSG_ID ? */
     50 	if (max <= TLV_TYPE_LENGTH + MSGID_SIZE)
     51 		return NULL;
     52 
     53 	t = (struct hello_tlv *) s;
     54 
     55 	if (ntohs(t->type) != LDP_HELLO)
     56 		return NULL;
     57 
     58 	/* Does its size fit into max ? */
     59 	if (ntohs(t->length) + TLV_TYPE_LENGTH > max)
     60 		return NULL;
     61 
     62 	t->type = ntohs(t->type);
     63 	t->length = ntohs(t->length);
     64 	t->messageid = ntohl(t->messageid);
     65 	return t;
     66 	/* We don't check for Common Hello Params here */
     67 }
     68 
     69 /* Prints out some information about TLV */
     70 void
     71 debug_tlv(struct tlv * t)
     72 {
     73 	warnp("TLV type %.4X, Length %d, Message ID %.8X\n", ntohs(t->type),
     74 	       ntohs(t->length), ntohs(t->messageid));
     75 }
     76