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