56748bc3d1e6b088cd9dcc2aa63ebce4d4539fa2Automatic Updater/*
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * Copyright (C) 2000, 2001, 2004, 2005, 2007, 2016 Internet Systems Consortium, Inc. ("ISC")
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * This Source Code Form is subject to the terms of the Mozilla Public
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * License, v. 2.0. If a copy of the MPL was not distributed with this
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * file, You can obtain one at http://mozilla.org/MPL/2.0/.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews */
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews/* $Id: lwpacket.c,v 1.18 2007/06/19 23:47:22 tbox Exp $ */
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews/*! \file */
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews/**
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * These functions rely on a struct lwres_lwpacket which is defined in
56748bc3d1e6b088cd9dcc2aa63ebce4d4539fa2Automatic Updater * \link lwpacket.h lwres/lwpacket.h.\endlink
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * The following opcodes are currently defined:
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \li #LWRES_OPCODE_NOOP
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * Success is always returned and the packet contents are
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * echoed. The \link lwres_noop.c lwres_noop_*()\endlink functions should be used for this
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * type.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \li #LWRES_OPCODE_GETADDRSBYNAME
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * returns all known addresses for a given name. The
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \link lwres_gabn.c lwres_gabn_*()\endlink functions should be used for this type.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \li #LWRES_OPCODE_GETNAMEBYADDR
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * return the hostname for the given address. The
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \link lwres_gnba.c lwres_gnba_*() \endlink functions should be used for this type.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * lwres_lwpacket_renderheader() transfers the contents of lightweight
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * resolver packet structure #lwres_lwpacket_t *pkt in network byte
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * order to the lightweight resolver buffer, *b.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * lwres_lwpacket_parseheader() performs the converse operation. It
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * transfers data in network byte order from buffer *b to resolver
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * packet *pkt. The contents of the buffer b should correspond to a
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * #lwres_lwpacket_t.
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * \section lwpacket_return Return Values
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews *
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * Successful calls to lwres_lwpacket_renderheader() and
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * lwres_lwpacket_parseheader() return #LWRES_R_SUCCESS. If there is
37b017f2ca736c251b80d2db564ef274317da168Mark Andrews * insufficient space to copy data between the buffer *b and
* lightweight resolver packet *pkt both functions return
* #LWRES_R_UNEXPECTEDEND.
*/
#include <config.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <lwres/lwbuffer.h>
#include <lwres/lwpacket.h>
#include <lwres/result.h>
#include "assert_p.h"
/*% Length of Packet */
#define LWPACKET_LENGTH \
(sizeof(lwres_uint16_t) * 4 + sizeof(lwres_uint32_t) * 5)
/*% transfers the contents of lightweight resolver packet structure lwres_lwpacket_t *pkt in network byte order to the lightweight resolver buffer, *b. */
lwres_result_t
lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
REQUIRE(b != NULL);
REQUIRE(pkt != NULL);
if (!SPACE_OK(b, LWPACKET_LENGTH))
return (LWRES_R_UNEXPECTEDEND);
lwres_buffer_putuint32(b, pkt->length);
lwres_buffer_putuint16(b, pkt->version);
lwres_buffer_putuint16(b, pkt->pktflags);
lwres_buffer_putuint32(b, pkt->serial);
lwres_buffer_putuint32(b, pkt->opcode);
lwres_buffer_putuint32(b, pkt->result);
lwres_buffer_putuint32(b, pkt->recvlength);
lwres_buffer_putuint16(b, pkt->authtype);
lwres_buffer_putuint16(b, pkt->authlength);
return (LWRES_R_SUCCESS);
}
/*% transfers data in network byte order from buffer *b to resolver packet *pkt. The contents of the buffer b should correspond to a lwres_lwpacket_t. */
lwres_result_t
lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
lwres_uint32_t space;
REQUIRE(b != NULL);
REQUIRE(pkt != NULL);
space = LWRES_BUFFER_REMAINING(b);
if (space < LWPACKET_LENGTH)
return (LWRES_R_UNEXPECTEDEND);
pkt->length = lwres_buffer_getuint32(b);
/*
* XXXBEW/MLG Checking that the buffer is long enough probably
* shouldn't be done here, since this function is supposed to just
* parse the header.
*/
if (pkt->length > space)
return (LWRES_R_UNEXPECTEDEND);
pkt->version = lwres_buffer_getuint16(b);
pkt->pktflags = lwres_buffer_getuint16(b);
pkt->serial = lwres_buffer_getuint32(b);
pkt->opcode = lwres_buffer_getuint32(b);
pkt->result = lwres_buffer_getuint32(b);
pkt->recvlength = lwres_buffer_getuint32(b);
pkt->authtype = lwres_buffer_getuint16(b);
pkt->authlength = lwres_buffer_getuint16(b);
return (LWRES_R_SUCCESS);
}