00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
132 lines
4.6 KiB
C
132 lines
4.6 KiB
C
/* $NetBSD: lwpacket.c,v 1.4 2014/12/10 04:38:02 christos Exp $ */
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/*
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* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: lwpacket.c,v 1.18 2007/06/19 23:47:22 tbox Exp */
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/*! \file */
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/**
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* These functions rely on a struct lwres_lwpacket which is defined in
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* \link lwpacket.h lwres/lwpacket.h.\endlink
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*
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* The following opcodes are currently defined:
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*
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* \li #LWRES_OPCODE_NOOP
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* Success is always returned and the packet contents are
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* echoed. The \link lwres_noop.c lwres_noop_*()\endlink functions should be used for this
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* type.
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*
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* \li #LWRES_OPCODE_GETADDRSBYNAME
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* returns all known addresses for a given name. The
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* \link lwres_gabn.c lwres_gabn_*()\endlink functions should be used for this type.
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*
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* \li #LWRES_OPCODE_GETNAMEBYADDR
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* return the hostname for the given address. The
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* \link lwres_gnba.c lwres_gnba_*() \endlink functions should be used for this type.
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*
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* lwres_lwpacket_renderheader() transfers the contents of lightweight
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* resolver packet structure #lwres_lwpacket_t *pkt in network byte
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* order to the lightweight resolver buffer, *b.
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*
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* lwres_lwpacket_parseheader() performs the converse operation. It
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* transfers data in network byte order from buffer *b to resolver
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* packet *pkt. The contents of the buffer b should correspond to a
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* #lwres_lwpacket_t.
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*
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* \section lwpacket_return Return Values
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*
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* Successful calls to lwres_lwpacket_renderheader() and
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* lwres_lwpacket_parseheader() return #LWRES_R_SUCCESS. If there is
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* insufficient space to copy data between the buffer *b and
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* lightweight resolver packet *pkt both functions return
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* #LWRES_R_UNEXPECTEDEND.
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*/
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#include <config.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <lwres/lwbuffer.h>
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#include <lwres/lwpacket.h>
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#include <lwres/result.h>
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#include "assert_p.h"
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/*% Length of Packet */
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#define LWPACKET_LENGTH \
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(sizeof(lwres_uint16_t) * 4 + sizeof(lwres_uint32_t) * 5)
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/*% transfers the contents of lightweight resolver packet structure lwres_lwpacket_t *pkt in network byte order to the lightweight resolver buffer, *b. */
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lwres_result_t
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lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
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REQUIRE(b != NULL);
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REQUIRE(pkt != NULL);
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if (!SPACE_OK(b, LWPACKET_LENGTH))
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return (LWRES_R_UNEXPECTEDEND);
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lwres_buffer_putuint32(b, pkt->length);
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lwres_buffer_putuint16(b, pkt->version);
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lwres_buffer_putuint16(b, pkt->pktflags);
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lwres_buffer_putuint32(b, pkt->serial);
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lwres_buffer_putuint32(b, pkt->opcode);
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lwres_buffer_putuint32(b, pkt->result);
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lwres_buffer_putuint32(b, pkt->recvlength);
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lwres_buffer_putuint16(b, pkt->authtype);
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lwres_buffer_putuint16(b, pkt->authlength);
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return (LWRES_R_SUCCESS);
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}
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/*% 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. */
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lwres_result_t
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lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
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lwres_uint32_t space;
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REQUIRE(b != NULL);
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REQUIRE(pkt != NULL);
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space = LWRES_BUFFER_REMAINING(b);
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if (space < LWPACKET_LENGTH)
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return (LWRES_R_UNEXPECTEDEND);
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pkt->length = lwres_buffer_getuint32(b);
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/*
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* XXXBEW/MLG Checking that the buffer is long enough probably
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* shouldn't be done here, since this function is supposed to just
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* parse the header.
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*/
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if (pkt->length > space)
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return (LWRES_R_UNEXPECTEDEND);
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pkt->version = lwres_buffer_getuint16(b);
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pkt->pktflags = lwres_buffer_getuint16(b);
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pkt->serial = lwres_buffer_getuint32(b);
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pkt->opcode = lwres_buffer_getuint32(b);
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pkt->result = lwres_buffer_getuint32(b);
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pkt->recvlength = lwres_buffer_getuint32(b);
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pkt->authtype = lwres_buffer_getuint16(b);
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pkt->authlength = lwres_buffer_getuint16(b);
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return (LWRES_R_SUCCESS);
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}
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