bin/named/lwderror.c

	lwderror.c revision 40f53fa8d9c6a4fc38c0014495e7a42b08f52481
/*
 * Copyright (C) 2000  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: lwderror.c,v 1.4 2000/08/01 01:11:46 tale Exp $ */

#include <config.h>

#include <isc/socket.h>
#include <isc/util.h>

#include <named/types.h>
#include <named/lwdclient.h>

/*
 * Generate an error packet for the client, schedule a send, and put us in
 * the SEND state.
 *
 * The client->pkt structure will be modified to form an error return.
 * The receiver needs to verify that it is in fact an error, and do the
 * right thing with it.  The opcode will be unchanged.  The result needs
 * to be set before calling this function.
 *
 * The only change this code makes is to set the receive buffer size to the
 * size we use, set the reply bit, and recompute any security information.
 */
void
ns_lwdclient_errorpktsend(ns_lwdclient_t *client, isc_uint32_t _result) {
    isc_result_t result;
    int lwres;
    isc_region_t r;
    lwres_buffer_t b;
    ns_lwdclientmgr_t *cm;

    cm = client->clientmgr;

    REQUIRE(NS_LWDCLIENT_ISRUNNING(client));

    /*
     * Since we are only sending the packet header, we can safely toss
     * the receive buffer.  This means we won't need to allocate space
     * for sending an error reply.  This is a Good Thing.
     */
    client->pkt.length = LWRES_LWPACKET_LENGTH;
    client->pkt.pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
    client->pkt.recvlength = LWRES_RECVLENGTH;
    client->pkt.authtype = 0; /* XXXMLG */
    client->pkt.authlength = 0;
    client->pkt.result = _result;

    lwres_buffer_init(&b, client->buffer, LWRES_RECVLENGTH);
    lwres = lwres_lwpacket_renderheader(&b, &client->pkt);
    if (lwres != LWRES_R_SUCCESS) {
        ns_lwdclient_stateidle(client);
        return;
    }

    r.base = client->buffer;
    r.length = b.used;
    client->sendbuf = client->buffer;
    result = isc_socket_sendto(cm->sock, &r, cm->task, ns_lwdclient_send,
                   client, &client->address, NULL);
    if (result != ISC_R_SUCCESS) {
        ns_lwdclient_stateidle(client);
        return;
    }

    NS_LWDCLIENT_SETSEND(client);
}