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　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。 . Prv8 Shell

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Current File : //usr/include/bind9/dns/iptable.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_IPTABLE_H
#define DNS_IPTABLE_H 1

#include <stdbool.h>

#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/radix.h>

#include <dns/types.h>

struct dns_iptable {
	unsigned int		magic;
	isc_mem_t		*mctx;
	isc_refcount_t		refcount;
	isc_radix_tree_t	*radix;
	ISC_LINK(dns_iptable_t)	nextincache;
};

#define DNS_IPTABLE_MAGIC	ISC_MAGIC('T','a','b','l')
#define DNS_IPTABLE_VALID(a)	ISC_MAGIC_VALID(a, DNS_IPTABLE_MAGIC)

/***
 *** Functions
 ***/

ISC_LANG_BEGINDECLS

isc_result_t
dns_iptable_create(isc_mem_t *mctx, dns_iptable_t **target);
/*
 * Create a new IP table and the underlying radix structure
 */

isc_result_t
dns_iptable_addprefix(dns_iptable_t *tab, isc_netaddr_t *addr,
		      uint16_t bitlen, bool pos);
isc_result_t
dns_iptable_addprefix2(dns_iptable_t *tab, isc_netaddr_t *addr,
		       uint16_t bitlen, bool pos,
		       bool is_ecs);
/*
 * Add an IP prefix to an existing IP table
 */

isc_result_t
dns_iptable_merge(dns_iptable_t *tab, dns_iptable_t *source, bool pos);
/*
 * Merge one IP table into another one.
 */

void
dns_iptable_attach(dns_iptable_t *source, dns_iptable_t **target);

void
dns_iptable_detach(dns_iptable_t **tabp);

ISC_LANG_ENDDECLS

#endif /* DNS_IPTABLE_H */

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