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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/geoip.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_GEOIP_H
#define DNS_GEOIP_H 1

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

/*! \file dns/geoip.h
 * \brief
 * GeoIP/GeoIP2 data types and function prototypes.
 */

#if defined(HAVE_GEOIP) || defined(HAVE_GEOIP2)

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

#include <stdbool.h>

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

#include <dns/name.h>
#include <dns/types.h>
#include <dns/iptable.h>

/***
 *** Types
 ***/

typedef enum {
	dns_geoip_countrycode,
	dns_geoip_countrycode3,
	dns_geoip_countryname,
	dns_geoip_continentcode,
	dns_geoip_continent,
	dns_geoip_region,
	dns_geoip_regionname,
	dns_geoip_country_code,
	dns_geoip_country_code3,
	dns_geoip_country_name,
	dns_geoip_country_continentcode,
	dns_geoip_country_continent,
	dns_geoip_region_countrycode,
	dns_geoip_region_code,
	dns_geoip_region_name,
	dns_geoip_city_countrycode,
	dns_geoip_city_countrycode3,
	dns_geoip_city_countryname,
	dns_geoip_city_region,
	dns_geoip_city_regionname,
	dns_geoip_city_name,
	dns_geoip_city_postalcode,
	dns_geoip_city_metrocode,
	dns_geoip_city_areacode,
	dns_geoip_city_continentcode,
	dns_geoip_city_continent,
	dns_geoip_city_timezonecode,
	dns_geoip_isp_name,
	dns_geoip_org_name,
	dns_geoip_as_asnum,
	dns_geoip_domain_name,
	dns_geoip_netspeed_id
} dns_geoip_subtype_t;

typedef struct dns_geoip_elem {
	dns_geoip_subtype_t subtype;
	void *db;
	union {
		char as_string[256];
		int as_int;
	};
} dns_geoip_elem_t;

struct dns_geoip_databases {
#ifdef HAVE_GEOIP2
	void *country;		/* GeoIP2-Country or GeoLite2-Country */
	void *city;		/* GeoIP2-CIty or GeoLite2-City */
	void *domain;		/* GeoIP2-Domain */
	void *isp;		/* GeoIP2-ISP */
	void *as;		/* GeoIP2-ASN or GeoLite2-ASN */
#else /* HAVE_GEOIP */
	void *country_v4;	/* GeoIP DB 1 */
	void *city_v4;		/* GeoIP DB 2 or 6 */
	void *region;		/* GeoIP DB 3 or 7 */
	void *isp;		/* GeoIP DB 4 */
	void *org;		/* GeoIP DB 5 */
	void *as;		/* GeoIP DB 9 */
	void *netspeed;		/* GeoIP DB 10 */
	void *domain;		/* GeoIP DB 11 */
	void *country_v6;	/* GeoIP DB 12 */
	void *city_v6;		/* GeoIP DB 30 or 31 */
#endif /* HAVE_GEOIP */
};

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

ISC_LANG_BEGINDECLS

bool
dns_geoip_match(const isc_netaddr_t *reqaddr, uint8_t *scope,
		const dns_geoip_databases_t *geoip,
		const dns_geoip_elem_t *elt);

void
dns_geoip_shutdown(void);

ISC_LANG_ENDDECLS

#endif /* HAVE_GEOIP | HAVE_GEOIP2 */

#endif /* DNS_GEOIP_H */

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