90 lines
3.2 KiB
C#
90 lines
3.2 KiB
C#
using Microsoft.Extensions.Hosting;
|
||
using Microsoft.Extensions.Logging;
|
||
using System;
|
||
using System.Collections.Generic;
|
||
using System.Net;
|
||
using System.Text;
|
||
using System.Threading;
|
||
using System.Threading.Tasks;
|
||
|
||
namespace FastGithub.Dns
|
||
{
|
||
/// <summary>
|
||
/// dns后台服务
|
||
/// </summary>
|
||
sealed class DnsOverUdpHostedService : BackgroundService
|
||
{
|
||
private readonly DnsOverUdpServer dnsOverUdpServer;
|
||
private readonly IEnumerable<IConflictValidator> conflictValidators;
|
||
private readonly ILogger<DnsOverUdpHostedService> logger;
|
||
|
||
/// <summary>
|
||
/// dns后台服务
|
||
/// </summary>
|
||
/// <param name="dnsOverUdpServer"></param>
|
||
/// <param name="conflictValidators"></param>
|
||
/// <param name="logger"></param>
|
||
public DnsOverUdpHostedService(
|
||
DnsOverUdpServer dnsOverUdpServer,
|
||
IEnumerable<IConflictValidator> conflictValidators,
|
||
ILogger<DnsOverUdpHostedService> logger)
|
||
{
|
||
this.dnsOverUdpServer = dnsOverUdpServer;
|
||
this.conflictValidators = conflictValidators;
|
||
this.logger = logger;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 启动dns
|
||
/// </summary>
|
||
/// <param name="cancellationToken"></param>
|
||
/// <returns></returns>
|
||
public override async Task StartAsync(CancellationToken cancellationToken)
|
||
{
|
||
try
|
||
{
|
||
const int DNS_PORT = 53;
|
||
this.dnsOverUdpServer.Listen(IPAddress.Any, DNS_PORT);
|
||
this.logger.LogInformation($"已监听udp端口{DNS_PORT}，DNS服务启动完成");
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
var builder = new StringBuilder().AppendLine($"DNS服务启动失败({ex.Message})，你可以选择如下的一种操作：");
|
||
builder.AppendLine($"1. 关闭占用udp53端口的进程然后重新打开本程序");
|
||
builder.AppendLine($"2. 配置系统或浏览器使用DNS over HTTPS：https://127.0.0.1/dns-query");
|
||
builder.AppendLine($"3. 向系统hosts文件添加github相关域名的ip为127.0.0.1");
|
||
builder.Append($"4. 在局域网其它设备上运行本程序，然后将本机DNS设置为局域网设备的IP");
|
||
this.logger.LogError(builder.ToString());
|
||
}
|
||
|
||
foreach (var item in this.conflictValidators)
|
||
{
|
||
await item.ValidateAsync();
|
||
}
|
||
|
||
await base.StartAsync(cancellationToken);
|
||
}
|
||
|
||
/// <summary>
|
||
/// dns后台
|
||
/// </summary>
|
||
/// <param name="stoppingToken"></param>
|
||
/// <returns></returns>
|
||
protected override Task ExecuteAsync(CancellationToken stoppingToken)
|
||
{
|
||
return this.dnsOverUdpServer.HandleAsync(stoppingToken);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 停止dns服务
|
||
/// </summary>
|
||
/// <param name="cancellationToken"></param>
|
||
/// <returns></returns>
|
||
public override Task StopAsync(CancellationToken cancellationToken)
|
||
{
|
||
this.dnsOverUdpServer.Dispose();
|
||
return base.StopAsync(cancellationToken);
|
||
}
|
||
}
|
||
}
|