116 lines
3.6 KiB
C#
116 lines
3.6 KiB
C#
using FastGithub.Configuration;
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using Microsoft.Extensions.Logging;
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using System;
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using System.IO;
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using System.Runtime.Versioning;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace FastGithub.PacketIntercept.Dns
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{
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/// <summary>
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/// host文件冲解决者
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/// </summary>
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[SupportedOSPlatform("windows")]
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sealed class HostsConflictSolver : IDnsConflictSolver
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{
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private readonly FastGithubConfig fastGithubConfig;
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private readonly ILogger<HostsConflictSolver> logger;
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/// <summary>
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/// host文件冲解决者
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/// </summary>
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/// <param name="fastGithubConfig"></param>
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/// <param name="logger"></param>
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public HostsConflictSolver(
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FastGithubConfig fastGithubConfig,
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ILogger<HostsConflictSolver> logger)
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{
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this.fastGithubConfig = fastGithubConfig;
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this.logger = logger;
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}
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/// <summary>
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/// 解决冲突
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/// </summary>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public async Task SolveAsync(CancellationToken cancellationToken)
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{
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var hostsPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), "drivers/etc/hosts");
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if (File.Exists(hostsPath) == false)
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{
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return;
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}
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Encoding hostsEncoding;
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var hasConflicting = false;
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var hostsBuilder = new StringBuilder();
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using (var fileStream = new FileStream(hostsPath, FileMode.Open, FileAccess.Read))
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{
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using var streamReader = new StreamReader(fileStream);
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while (streamReader.EndOfStream == false)
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{
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var line = await streamReader.ReadLineAsync();
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if (this.IsConflictingLine(line))
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{
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hasConflicting = true;
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hostsBuilder.AppendLine($"# {line}");
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}
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else
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{
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hostsBuilder.AppendLine(line);
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}
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}
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hostsEncoding = streamReader.CurrentEncoding;
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}
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if (hasConflicting == true)
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{
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try
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{
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await File.WriteAllTextAsync(hostsPath, hostsBuilder.ToString(), hostsEncoding, cancellationToken);
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}
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catch (Exception ex)
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{
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this.logger.LogWarning($"无法解决hosts文件冲突：{ex.Message}");
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}
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}
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}
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/// <summary>
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/// 恢复冲突
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/// </summary>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public Task RestoreAsync(CancellationToken cancellationToken)
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{
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return Task.CompletedTask;
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}
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/// <summary>
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/// 是否为冲突的行
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/// </summary>
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/// <param name="line"></param>
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/// <returns></returns>
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private bool IsConflictingLine(string? line)
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{
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if (line == null || line.TrimStart().StartsWith("#"))
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{
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return false;
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}
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var items = line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
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if (items.Length < 2)
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{
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return false;
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}
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var domain = items[1];
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return this.fastGithubConfig.IsMatch(domain);
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}
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}
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}
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