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_ECS_H
#define DNS_ECS_H 1

#include <inttypes.h>

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

#include <dns/types.h>

struct dns_ecs {
	isc_netaddr_t addr;
	uint8_t	      source;
	uint8_t	      scope;
};

#define DNS_ECS_FORMATSIZE                                \
	(ISC_NETADDR_FORMATSIZE + 8) /* <address>/NNN/NNN \
				      */

ISC_LANG_BEGINDECLS

void
dns_ecs_init(dns_ecs_t *ecs);
/*%<
 * Initialize a DNS ECS structure.
 *
 * Requires:
 * \li 'ecs' is not NULL and points to a valid dns_ecs structure.
 */

void
dns_ecs_format(dns_ecs_t *ecs, char *buf, size_t size);
/*%<
 * Format an ECS record as text. Result is guaranteed to be null-terminated.
 *
 * Requires:
 * \li  'ecs' is not NULL.
 * \li  'buf' is not NULL.
 * \li  'size' is at least DNS_ECS_FORMATSIZE
 */

ISC_LANG_ENDDECLS

#endif /* DNS_ECS_H */