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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/clientinfo.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_CLIENTINFO_H
#define DNS_CLIENTINFO_H 1

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

/*! \file dns/clientinfo.h
 * \brief
 * The DNS clientinfo interface allows libdns to retrieve information
 * about the client from the caller.
 *
 * The clientinfo interface is used by the DNS DB and DLZ interfaces;
 * it allows databases to modify their answers on the basis of information
 * about the client, such as source IP address.
 *
 * dns_clientinfo_t contains a pointer to an opaque structure containing
 * client information in some form.  dns_clientinfomethods_t contains a
 * list of methods which operate on that opaque structure to return
 * potentially useful data.  Both structures also contain versioning
 * information.
 */

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

#include <inttypes.h>

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

ISC_LANG_BEGINDECLS

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

#define DNS_CLIENTINFO_VERSION 2
typedef struct dns_clientinfo {
	uint16_t version;
	void *data;
	void *dbversion;
} dns_clientinfo_t;

typedef isc_result_t (*dns_clientinfo_sourceip_t)(dns_clientinfo_t *client,
						  isc_sockaddr_t **addrp);

#define DNS_CLIENTINFOMETHODS_VERSION 2
#define DNS_CLIENTINFOMETHODS_AGE 1

typedef struct dns_clientinfomethods {
	uint16_t version;
	uint16_t age;
	dns_clientinfo_sourceip_t sourceip;
} dns_clientinfomethods_t;

/*****
 ***** Methods
 *****/
void
dns_clientinfomethods_init(dns_clientinfomethods_t *methods,
			   dns_clientinfo_sourceip_t sourceip);

void
dns_clientinfo_init(dns_clientinfo_t *ci, void *data, void *versionp);

ISC_LANG_ENDDECLS

#endif /* DNS_CLIENTINFO_H */

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