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 * 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