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      1 /* $NetBSD: notifications.c,v 1.3 2013/07/11 05:45:23 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 <arpa/inet.h>
     33 
     34 #include <stdlib.h>
     35 
     36 #include "ldp.h"
     37 #include "socketops.h"
     38 #include "tlv.h"
     39 #include "ldp_errors.h"
     40 #include "notifications.h"
     41 
     42 /* builds a notification TLV. Do not forget to free the result */
     43 struct notification_tlv *
     44 build_notification(uint32_t msg, uint32_t n)
     45 {
     46 	struct notification_tlv *t;
     47 	t = malloc(sizeof(*t));
     48 
     49 	if (!t) {
     50 		fatalp("build_notification: malloc problem\n");
     51 		return NULL;
     52 	}
     53 
     54 	t->type = htons(LDP_NOTIFICATION);
     55 	t->length = htons(sizeof(struct notification_tlv) - TLV_TYPE_LENGTH);
     56 	t->status = htons(TLV_STATUS);
     57 	t->st_len = sizeof(struct notification_tlv) - 2 * TLV_TYPE_LENGTH;
     58 	t->st_code = htonl(n);
     59 	t->msg_id = htonl(msg);
     60 	t->msg_type = 0;
     61 	return t;
     62 
     63 }
     64 
     65 int
     66 send_notification(const struct ldp_peer * p, uint32_t msg, uint32_t code)
     67 {
     68 	struct notification_tlv *nt;
     69 	int             rv;
     70 
     71 	if (p->state != LDP_PEER_CONNECTED && p->state != LDP_PEER_ESTABLISHED)
     72 		return -1;
     73 
     74 	nt = build_notification(msg, code);
     75 
     76 	rv = send_tlv(p, (struct tlv *) nt);
     77 	free(nt);
     78 	return rv;
     79 }
     80