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@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 *
get_hello_tlv(unsigned char * s,uint max)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
debug_tlv(struct tlv * t)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