external/bsd/bind/dist/bin/named/lwderror.c

   1 /*      $NetBSD: lwderror.c,v 1.4 2014/12/10 04:37:51 christos Exp $    */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: lwderror.c,v 1.12 2007/06/19 23:46:59 tbox Exp  */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <isc/socket.h>
  27 #include <isc/util.h>
  28
  29 #include <named/types.h>
  30 #include <named/lwdclient.h>
  31
  32 /*%
  33  * Generate an error packet for the client, schedule a send, and put us in
  34  * the SEND state.
  35  *
  36  * The client->pkt structure will be modified to form an error return.
  37  * The receiver needs to verify that it is in fact an error, and do the
  38  * right thing with it.  The opcode will be unchanged.  The result needs
  39  * to be set before calling this function.
  40  *
  41  * The only change this code makes is to set the receive buffer size to the
  42  * size we use, set the reply bit, and recompute any security information.
  43  */
  44 void
  45 ns_lwdclient_errorpktsend(ns_lwdclient_t *client, isc_uint32_t _result) {
  46         isc_result_t result;
  47         int lwres;
  48         isc_region_t r;
  49         lwres_buffer_t b;
  50
  51         REQUIRE(NS_LWDCLIENT_ISRUNNING(client));
  52
  53         /*
  54          * Since we are only sending the packet header, we can safely toss
  55          * the receive buffer.  This means we won't need to allocate space
  56          * for sending an error reply.  This is a Good Thing.
  57          */
  58         client->pkt.length = LWRES_LWPACKET_LENGTH;
  59         client->pkt.pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
  60         client->pkt.recvlength = LWRES_RECVLENGTH;
  61         client->pkt.authtype = 0; /* XXXMLG */
  62         client->pkt.authlength = 0;
  63         client->pkt.result = _result;
  64
  65         lwres_buffer_init(&b, client->buffer, LWRES_RECVLENGTH);
  66         lwres = lwres_lwpacket_renderheader(&b, &client->pkt);
  67         if (lwres != LWRES_R_SUCCESS) {
  68                 ns_lwdclient_stateidle(client);
  69                 return;
  70         }
  71
  72         r.base = client->buffer;
  73         r.length = b.used;
  74         client->sendbuf = client->buffer;
  75         result = ns_lwdclient_sendreply(client, &r);
  76         if (result != ISC_R_SUCCESS) {
  77                 ns_lwdclient_stateidle(client);
  78                 return;
  79         }
  80
  81         NS_LWDCLIENT_SETSEND(client);
  82 }