91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/* $NetBSD: pdu.c,v 1.1 2010/12/08 07:20:15 kefren Exp $ */
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/*-
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Mihai Chelaru <kefren@NetBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <strings.h>
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#include <stdlib.h>
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#include "socketops.h"
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#include "ldp_errors.h"
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#include "ldp.h"
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#include "ldp_peer.h"
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#include "notifications.h"
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#include "pdu.h"
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uint
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get_pdu(unsigned char *s, struct ldp_pdu * p)
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{
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struct ldp_pdu *p1;
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p1 = (struct ldp_pdu *) s;
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p->version = ntohs(p1->version);
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p->length = ntohs(p1->length);
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memcpy(&p->ldp_id, &p1->ldp_id, sizeof(struct in_addr));
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p->label_space = ntohs(p1->label_space);
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return MIN_PDU_SIZE;
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}
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/* Checks an incoming PDU for size and version */
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int
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check_recv_pdu(struct ldp_peer * p, struct ldp_pdu * rpdu, int c)
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{
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struct notification_tlv *notiftlv;
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/* Avoid underflow */
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if (c < MIN_PDU_SIZE)
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return LDP_E_BAD_LENGTH;
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/* Check PDU for right LDP version */
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if (ntohs(rpdu->version) != LDP_VERSION) {
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fatalp("Invalid PDU version received from %s (%d)\n",
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inet_ntoa(p->address), ntohs(rpdu->version));
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notiftlv = build_notification(0, NOTIF_BAD_LDP_VER);
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send_tlv(p, (struct tlv *) notiftlv);
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free(notiftlv);
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return LDP_E_BAD_VERSION;
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}
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/* Check PDU for length validity */
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if (ntohs(rpdu->length) > c - PDU_VER_LENGTH) {
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fatalp("Invalid PDU length received from %s (announced %d, "
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"received %d)\n", inet_ntoa(p->address),
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ntohs(rpdu->length), (int) (c - PDU_VER_LENGTH));
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notiftlv = build_notification(0, NOTIF_BAD_PDU_LEN);
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send_tlv(p, (struct tlv *) notiftlv);
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free(notiftlv);
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return LDP_E_BAD_LENGTH;
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}
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return LDP_E_OK;
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}
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