/contrib/bind9/bin/named/lwderror.c

 1/*
 2 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
 3 * Copyright (C) 2000, 2001  Internet Software Consortium.
 4 *
 5 * Permission to use, copy, modify, and/or distribute this software for any
 6 * purpose with or without fee is hereby granted, provided that the above
 7 * copyright notice and this permission notice appear in all copies.
 8 *
 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: lwderror.c,v 1.12 2007/06/19 23:46:59 tbox Exp $ */
19
20/*! \file */
21
22#include <config.h>
23
24#include <isc/socket.h>
25#include <isc/util.h>
26
27#include <named/types.h>
28#include <named/lwdclient.h>
29
30/*%
31 * Generate an error packet for the client, schedule a send, and put us in
32 * the SEND state.
33 *
34 * The client->pkt structure will be modified to form an error return.
35 * The receiver needs to verify that it is in fact an error, and do the
36 * right thing with it.  The opcode will be unchanged.  The result needs
37 * to be set before calling this function.
38 *
39 * The only change this code makes is to set the receive buffer size to the
40 * size we use, set the reply bit, and recompute any security information.
41 */
42void
43ns_lwdclient_errorpktsend(ns_lwdclient_t *client, isc_uint32_t _result) {
44	isc_result_t result;
45	int lwres;
46	isc_region_t r;
47	lwres_buffer_t b;
48
49	REQUIRE(NS_LWDCLIENT_ISRUNNING(client));
50
51	/*
52	 * Since we are only sending the packet header, we can safely toss
53	 * the receive buffer.  This means we won't need to allocate space
54	 * for sending an error reply.  This is a Good Thing.
55	 */
56	client->pkt.length = LWRES_LWPACKET_LENGTH;
57	client->pkt.pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
58	client->pkt.recvlength = LWRES_RECVLENGTH;
59	client->pkt.authtype = 0; /* XXXMLG */
60	client->pkt.authlength = 0;
61	client->pkt.result = _result;
62
63	lwres_buffer_init(&b, client->buffer, LWRES_RECVLENGTH);
64	lwres = lwres_lwpacket_renderheader(&b, &client->pkt);
65	if (lwres != LWRES_R_SUCCESS) {
66		ns_lwdclient_stateidle(client);
67		return;
68	}
69
70	r.base = client->buffer;
71	r.length = b.used;
72	client->sendbuf = client->buffer;
73	result = ns_lwdclient_sendreply(client, &r);
74	if (result != ISC_R_SUCCESS) {
75		ns_lwdclient_stateidle(client);
76		return;
77	}
78
79	NS_LWDCLIENT_SETSEND(client);
80}