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.
 */

#ifndef DNS_DNSRPS_H
#define DNS_DNSRPS_H

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

#include <isc/lang.h>

#include <dns/types.h>

#ifdef USE_DNSRPS

#include <dns/librpz.h>
#include <dns/rpz.h>

/*
 * Error message if dlopen(librpz) failed.
 */
extern librpz_emsg_t librpz_lib_open_emsg;

/*
 * These shim BIND9 database, node, and rdataset are handles on RRs from librpz.
 *
 * All of these structures are used by a single thread and so need no locks.
 *
 * rpsdb_t holds the state for a set of RPZ queries.
 *
 * rpsnode_t is a link to the rpsdb_t for the set of  RPZ queries
 * and a flag saying whether it is pretending to be a node with RRs for
 * the qname or the node with the SOA for the zone containing the rewritten
 * RRs or justifying NXDOMAIN.
 */
typedef struct {
	uint8_t unused;
} rpsnode_t;
typedef struct rpsdb {
	dns_db_t	    common;
	int		    ref_cnt;
	librpz_result_id_t  hit_id;
	librpz_result_t	    result;
	librpz_rsp_t	     *rsp;
	librpz_domain_buf_t origin_buf;
	const dns_name_t	 *qname;
	rpsnode_t	    origin_node;
	rpsnode_t	    data_node;
} rpsdb_t;

/*
 * Convert a dnsrps policy to a classic BIND9 RPZ policy.
 */
dns_rpz_policy_t
dns_dnsrps_2policy(librpz_policy_t rps_policy);

/*
 * Convert a dnsrps trigger to a classic BIND9 RPZ rewrite or trigger type.
 */
dns_rpz_type_t
dns_dnsrps_trig2type(librpz_trig_t trig);

/*
 * Convert a classic BIND9 RPZ rewrite or trigger type to a librpz trigger type.
 */
librpz_trig_t
dns_dnsrps_type2trig(dns_rpz_type_t type);

/*
 * Start dnsrps for the entire server.
 */
isc_result_t
dns_dnsrps_server_create(void);

/*
 * Stop dnsrps for the entire server.
 */
void
dns_dnsrps_server_destroy(void);

/*
 * Ready dnsrps for a view.
 */
isc_result_t
dns_dnsrps_view_init(dns_rpz_zones_t *new, char *rps_cstr);

/*
 * Connect to and start the dnsrps daemon, dnsrpzd.
 */
isc_result_t
dns_dnsrps_connect(dns_rpz_zones_t *rpzs);

/*
 * Get ready to try dnsrps rewriting.
 */
isc_result_t
dns_dnsrps_rewrite_init(librpz_emsg_t *emsg, dns_rpz_st_t *st,
			dns_rpz_zones_t *rpzs, const dns_name_t *qname,
			isc_mem_t *mctx, bool have_rd);

#endif /* USE_DNSRPS */

ISC_LANG_ENDDECLS

#endif /* DNS_DNSRPS_H */