contrib/bind-9.2.4rc7/bin/named/lwderror.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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 1.7.2.1 2004/03/09 06:09:18 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <isc/socket.h>
  23 #include <isc/util.h>
  24
  25 #include <named/types.h>
  26 #include <named/lwdclient.h>
  27
  28 /*
  29  * Generate an error packet for the client, schedule a send, and put us in
  30  * the SEND state.
  31  *
  32  * The client->pkt structure will be modified to form an error return.
  33  * The receiver needs to verify that it is in fact an error, and do the
  34  * right thing with it.  The opcode will be unchanged.  The result needs
  35  * to be set before calling this function.
  36  *
  37  * The only change this code makes is to set the receive buffer size to the
  38  * size we use, set the reply bit, and recompute any security information.
  39  */
  40 void
  41 ns_lwdclient_errorpktsend(ns_lwdclient_t *client, isc_uint32_t _result) {
  42         isc_result_t result;
  43         int lwres;
  44         isc_region_t r;
  45         lwres_buffer_t b;
  46
  47         REQUIRE(NS_LWDCLIENT_ISRUNNING(client));
  48
  49         /*
  50          * Since we are only sending the packet header, we can safely toss
  51          * the receive buffer.  This means we won't need to allocate space
  52          * for sending an error reply.  This is a Good Thing.
  53          */
  54         client->pkt.length = LWRES_LWPACKET_LENGTH;
  55         client->pkt.pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
  56         client->pkt.recvlength = LWRES_RECVLENGTH;
  57         client->pkt.authtype = 0; /* XXXMLG */
  58         client->pkt.authlength = 0;
  59         client->pkt.result = _result;
  60
  61         lwres_buffer_init(&b, client->buffer, LWRES_RECVLENGTH);
  62         lwres = lwres_lwpacket_renderheader(&b, &client->pkt);
  63         if (lwres != LWRES_R_SUCCESS) {
  64                 ns_lwdclient_stateidle(client);
  65                 return;
  66         }
  67
  68         r.base = client->buffer;
  69         r.length = b.used;
  70         client->sendbuf = client->buffer;
  71         result = ns_lwdclient_sendreply(client, &r);
  72         if (result != ISC_R_SUCCESS) {
  73                 ns_lwdclient_stateidle(client);
  74                 return;
  75         }
  76
  77         NS_LWDCLIENT_SETSEND(client);
  78 }