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/forward.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_FORWARD_H
#define DNS_FORWARD_H 1

/*! \file dns/forward.h */

#include <isc/lang.h>
#include <isc/result.h>
#include <isc/sockaddr.h>

#include <dns/types.h>

ISC_LANG_BEGINDECLS

struct dns_forwarder {
	isc_sockaddr_t			addr;
	isc_dscp_t			dscp;
	ISC_LINK(dns_forwarder_t)	link;
};

typedef ISC_LIST(struct dns_forwarder)	dns_forwarderlist_t;

struct dns_forwarders {
	dns_forwarderlist_t	fwdrs;
	dns_fwdpolicy_t		fwdpolicy;
};

isc_result_t
dns_fwdtable_create(isc_mem_t *mctx, dns_fwdtable_t **fwdtablep);
/*%<
 * Creates a new forwarding table.
 *
 * Requires:
 * \li 	mctx is a valid memory context.
 * \li	fwdtablep != NULL && *fwdtablep == NULL
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_NOMEMORY
 */

isc_result_t
dns_fwdtable_addfwd(dns_fwdtable_t *fwdtable, dns_name_t *name,
		    dns_forwarderlist_t *fwdrs, dns_fwdpolicy_t policy);
isc_result_t
dns_fwdtable_add(dns_fwdtable_t *fwdtable, dns_name_t *name,
		 isc_sockaddrlist_t *addrs, dns_fwdpolicy_t policy);
/*%<
 * Adds an entry to the forwarding table.  The entry associates
 * a domain with a list of forwarders and a forwarding policy.  The
 * addrs/fwdrs list is copied if not empty, so the caller should free
 * its copy.
 *
 * Requires:
 * \li	fwdtable is a valid forwarding table.
 * \li	name is a valid name
 * \li	addrs/fwdrs is a valid list of isc_sockaddr/dns_forwarder
 *      structures, which may be empty.
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_NOMEMORY
 */

isc_result_t
dns_fwdtable_delete(dns_fwdtable_t *fwdtable, dns_name_t *name);
/*%<
 * Removes an entry for 'name' from the forwarding table.  If an entry
 * that exactly matches 'name' does not exist, ISC_R_NOTFOUND will be returned.
 *
 * Requires:
 * \li	fwdtable is a valid forwarding table.
 * \li	name is a valid name
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_NOTFOUND
 */

isc_result_t
dns_fwdtable_find(dns_fwdtable_t *fwdtable, dns_name_t *name,
		  dns_forwarders_t **forwardersp);
/*%<
 * Finds a domain in the forwarding table.  The closest matching parent
 * domain is returned.
 *
 * Requires:
 * \li	fwdtable is a valid forwarding table.
 * \li	name is a valid name
 * \li	forwardersp != NULL && *forwardersp == NULL
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_NOTFOUND
 */

isc_result_t
dns_fwdtable_find2(dns_fwdtable_t *fwdtable, dns_name_t *name,
		   dns_name_t *foundname, dns_forwarders_t **forwardersp);
/*%<
 * Finds a domain in the forwarding table.  The closest matching parent
 * domain is returned.
 *
 * Requires:
 * \li	fwdtable is a valid forwarding table.
 * \li	name is a valid name
 * \li	forwardersp != NULL && *forwardersp == NULL
 * \li	foundname to be NULL or a valid name with buffer.
 *
 * Returns:
 * \li	#ISC_R_SUCCESS
 * \li	#ISC_R_NOTFOUND
 */

void
dns_fwdtable_destroy(dns_fwdtable_t **fwdtablep);
/*%<
 * Destroys a forwarding table.
 *
 * Requires:
 * \li	fwtablep != NULL && *fwtablep != NULL
 *
 * Ensures:
 * \li	all memory associated with the forwarding table is freed.
 */

ISC_LANG_ENDDECLS

#endif /* DNS_FORWARD_H */

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