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} 81