84 lines
2.8 KiB
C#
84 lines
2.8 KiB
C#
using Microsoft.Extensions.Hosting;
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using Microsoft.Extensions.Logging;
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using System;
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using System.Collections.Generic;
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using System.Net;
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using System.Threading;
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using System.Threading.Tasks;
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namespace FastGithub.Dns
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{
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/// <summary>
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/// dns后台服务
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/// </summary>
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sealed class DnsHostedService : BackgroundService
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{
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private readonly DnsOverUdpServer dnsOverUdpServer;
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private readonly IEnumerable<IConflictValidator> conflictValidators;
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private readonly ILogger<DnsHostedService> logger;
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/// <summary>
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/// dns后台服务
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/// </summary>
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/// <param name="dnsOverUdpServer"></param>
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/// <param name="conflictValidators"></param>
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/// <param name="logger"></param>
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public DnsHostedService(
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DnsOverUdpServer dnsOverUdpServer,
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IEnumerable<IConflictValidator> conflictValidators,
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ILogger<DnsHostedService> logger)
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{
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this.dnsOverUdpServer = dnsOverUdpServer;
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this.conflictValidators = conflictValidators;
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this.logger = logger;
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}
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/// <summary>
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/// 启动dns
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/// </summary>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public override async Task StartAsync(CancellationToken cancellationToken)
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{
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try
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{
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const int DNS_PORT = 53;
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this.dnsOverUdpServer.Listen(IPAddress.Any, DNS_PORT);
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this.logger.LogInformation($"已监听udp端口{DNS_PORT}，DNS服务启动完成");
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}
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catch (Exception ex)
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{
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this.logger.LogError($"DNS服务启动失败：{ex.Message}{Environment.NewLine}请配置系统或浏览器使用{nameof(FastGithub)}的DoH：https://127.0.0.1/dns-query，或向系统hosts文件添加github相关域名的ip为127.0.0.1");
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}
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foreach (var item in this.conflictValidators)
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{
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await item.ValidateAsync();
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}
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await base.StartAsync(cancellationToken);
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}
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/// <summary>
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/// dns后台
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/// </summary>
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/// <param name="stoppingToken"></param>
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/// <returns></returns>
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protected override Task ExecuteAsync(CancellationToken stoppingToken)
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{
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return this.dnsOverUdpServer.HandleAsync(stoppingToken);
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}
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/// <summary>
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/// 停止dns服务
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/// </summary>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public override Task StopAsync(CancellationToken cancellationToken)
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{
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this.dnsOverUdpServer.Dispose();
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return base.StopAsync(cancellationToken);
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}
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}
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}
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