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。 sh-3ll

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/*
 * 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.
 */

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

#ifndef DLZ_DLOPEN_H
#define DLZ_DLOPEN_H

#include <inttypes.h>
#include <stdbool.h>

#include <dns/sdlz.h>

ISC_LANG_BEGINDECLS

/*
 * This header provides a minimal set of defines and typedefs needed
 * for the entry points of an external DLZ module for bind9.
 */

#define DLZ_DLOPEN_VERSION 3
#define DLZ_DLOPEN_AGE	   0

/*
 * dlz_dlopen_version() is required for all DLZ external drivers. It
 * should return DLZ_DLOPEN_VERSION
 */
typedef int
dlz_dlopen_version_t(unsigned int *flags);

/*
 * dlz_dlopen_create() is required for all DLZ external drivers.
 */
typedef isc_result_t
dlz_dlopen_create_t(const char *dlzname, unsigned int argc, char *argv[],
		    void **dbdata, ...);

/*
 * dlz_dlopen_destroy() is optional, and will be called when the
 * driver is unloaded if supplied
 */
typedef void
dlz_dlopen_destroy_t(void *dbdata);

/*
 * dlz_dlopen_findzonedb() is required for all DLZ external drivers
 */
typedef isc_result_t
dlz_dlopen_findzonedb_t(void *dbdata, const char *name,
			dns_clientinfomethods_t *methods,
			dns_clientinfo_t	 *clientinfo);

/*
 * dlz_dlopen_lookup() is required for all DLZ external drivers
 */
typedef isc_result_t
dlz_dlopen_lookup_t(const char *zone, const char *name, void *dbdata,
		    dns_sdlzlookup_t *lookup, dns_clientinfomethods_t *methods,
		    dns_clientinfo_t *clientinfo);

/*
 * dlz_dlopen_authority is optional() if dlz_dlopen_lookup()
 * supplies authority information for the dns record
 */
typedef isc_result_t
dlz_dlopen_authority_t(const char *zone, void *dbdata,
		       dns_sdlzlookup_t *lookup);

/*
 * dlz_dlopen_allowzonexfr() is optional, and should be supplied if
 * you want to support zone transfers
 */
typedef isc_result_t
dlz_dlopen_allowzonexfr_t(void *dbdata, const char *name, const char *client);

/*
 * dlz_dlopen_allnodes() is optional, but must be supplied if supply a
 * dlz_dlopen_allowzonexfr() function
 */
typedef isc_result_t
dlz_dlopen_allnodes_t(const char *zone, void *dbdata,
		      dns_sdlzallnodes_t *allnodes);

/*
 * dlz_dlopen_newversion() is optional. It should be supplied if you
 * want to support dynamic updates.
 */
typedef isc_result_t
dlz_dlopen_newversion_t(const char *zone, void *dbdata, void **versionp);

/*
 * dlz_closeversion() is optional, but must be supplied if you supply
 * a dlz_newversion() function
 */
typedef void
dlz_dlopen_closeversion_t(const char *zone, bool commit, void *dbdata,
			  void **versionp);

/*
 * dlz_dlopen_configure() is optional, but must be supplied if you
 * want to support dynamic updates
 */
typedef isc_result_t
dlz_dlopen_configure_t(dns_view_t *view, dns_dlzdb_t *dlzdb, void *dbdata);

/*
 * dlz_dlopen_setclientcallback() is optional, but must be supplied if you
 * want to retrieve information about the client (e.g., source address)
 * before sending a replay.
 */
typedef isc_result_t
dlz_dlopen_setclientcallback_t(dns_view_t *view, void *dbdata);

/*
 * dlz_dlopen_ssumatch() is optional, but must be supplied if you want
 * to support dynamic updates
 */
typedef bool
dlz_dlopen_ssumatch_t(const char *signer, const char *name, const char *tcpaddr,
		      const char *type, const char *key, uint32_t keydatalen,
		      unsigned char *keydata, void *dbdata);

/*
 * dlz_dlopen_addrdataset() is optional, but must be supplied if you
 * want to support dynamic updates
 */
typedef isc_result_t
dlz_dlopen_addrdataset_t(const char *name, const char *rdatastr, void *dbdata,
			 void *version);

/*
 * dlz_dlopen_subrdataset() is optional, but must be supplied if you
 * want to support dynamic updates
 */
typedef isc_result_t
dlz_dlopen_subrdataset_t(const char *name, const char *rdatastr, void *dbdata,
			 void *version);

/*
 * dlz_dlopen_delrdataset() is optional, but must be supplied if you
 * want to support dynamic updates
 */
typedef isc_result_t
dlz_dlopen_delrdataset_t(const char *name, const char *type, void *dbdata,
			 void *version);

ISC_LANG_ENDDECLS

#endif /* ifndef DLZ_DLOPEN_H */