晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/bind9/dns/soa.h
/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef DNS_SOA_H
#define DNS_SOA_H 1

/*****
 ***** Module Info
 *****/

/*! \file dns/soa.h
 * \brief
 * SOA utilities.
 */

/***
 *** Imports
 ***/

#include <inttypes.h>

#include <isc/lang.h>
#include <isc/types.h>

#include <dns/types.h>

ISC_LANG_BEGINDECLS

#define DNS_SOA_BUFFERSIZE      ((2 * DNS_NAME_MAXWIRE) + (4 * 5))

isc_result_t
dns_soa_buildrdata(dns_name_t *origin, dns_name_t *contact,
		   dns_rdataclass_t rdclass,
		   uint32_t serial, uint32_t refresh,
		   uint32_t retry, uint32_t expire,
		   uint32_t minimum, unsigned char *buffer,
		   dns_rdata_t *rdata);
/*%<
 * Build the rdata of an SOA record.
 *
 * Requires:
 *\li   buffer  Points to a temporary buffer of at least
 *              DNS_SOA_BUFFERSIZE bytes.
 *\li   rdata   Points to an initialized dns_rdata_t.
 *
 * Ensures:
 *  \li    *rdata       Contains a valid SOA rdata.  The 'data' member
 *  			refers to 'buffer'.
 */

uint32_t
dns_soa_getserial(dns_rdata_t *rdata);
uint32_t
dns_soa_getrefresh(dns_rdata_t *rdata);
uint32_t
dns_soa_getretry(dns_rdata_t *rdata);
uint32_t
dns_soa_getexpire(dns_rdata_t *rdata);
uint32_t
dns_soa_getminimum(dns_rdata_t *rdata);
/*
 * Extract an integer field from the rdata of a SOA record.
 *
 * Requires:
 *	rdata refers to the rdata of a well-formed SOA record.
 */

void
dns_soa_setserial(uint32_t val, dns_rdata_t *rdata);
void
dns_soa_setrefresh(uint32_t val, dns_rdata_t *rdata);
void
dns_soa_setretry(uint32_t val, dns_rdata_t *rdata);
void
dns_soa_setexpire(uint32_t val, dns_rdata_t *rdata);
void
dns_soa_setminimum(uint32_t val, dns_rdata_t *rdata);
/*
 * Change an integer field of a SOA record by modifying the
 * rdata in-place.
 *
 * Requires:
 *	rdata refers to the rdata of a well-formed SOA record.
 */


ISC_LANG_ENDDECLS

#endif /* DNS_SOA_H */

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