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 2005-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef OPENSSL_DTLS1_H
#define OPENSSL_DTLS1_H
#pragma once

#include <openssl/macros.h>
#ifndef OPENSSL_NO_DEPRECATED_3_0
#define HEADER_DTLS1_H
#endif

#include <openssl/prov_ssl.h>

#ifdef __cplusplus
extern "C" {
#endif

#include <openssl/opensslconf.h>

/* DTLS*_VERSION constants are defined in prov_ssl.h */
#ifndef OPENSSL_NO_DEPRECATED_3_0
#define DTLS_MIN_VERSION DTLS1_VERSION
#define DTLS_MAX_VERSION DTLS1_2_VERSION
#endif
#define DTLS1_VERSION_MAJOR 0xFE

/* Special value for method supporting multiple versions */
#define DTLS_ANY_VERSION 0x1FFFF

/* lengths of messages */

#define DTLS1_COOKIE_LENGTH 255

#define DTLS1_RT_HEADER_LENGTH 13

#define DTLS1_HM_HEADER_LENGTH 12

#define DTLS1_HM_BAD_FRAGMENT -2
#define DTLS1_HM_FRAGMENT_RETRY -3

#define DTLS1_CCS_HEADER_LENGTH 1

#define DTLS1_AL_HEADER_LENGTH 2

#define DTLS1_TMO_ALERT_COUNT 12

#ifdef __cplusplus
}
#endif
#endif