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/*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <isc/assertions.h>
#include <isc/mem.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/socket.h>
#include <isc/task.h>
#include <isc/util.h>
#include <dns/fixedname.h>
#include <lwres/lwres.h>
#include <lwres/result.h>
#include "client.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
error_pkt_send(client_t *client, isc_uint32_t _result)
{
isc_result_t result;
int lwres;
isc_region_t r;
lwres_buffer_t b;
clientmgr_t *cm;
cm = client->clientmgr;
REQUIRE(CLIENT_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.flags |= 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) {
client_state_idle(client);
return;
}
r.base = client->buffer;
r.length = b.used;
client->sendbuf = client->buffer;
result = isc_socket_sendto(cm->sock, &r, cm->task, client_send, client,
&client->address, NULL);
if (result != ISC_R_SUCCESS) {
client_state_idle(client);
return;
}
CLIENT_SETSEND(client);
}
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