mirror of
https://github.com/proxysu/ProxySU.git
synced 2024-12-01 09:36:06 +03:00
824 lines
26 KiB
C#
824 lines
26 KiB
C#
using MvvmCross;
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using MvvmCross.Navigation;
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using ProxySuper.Core.Helpers;
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using ProxySuper.Core.Models;
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using ProxySuper.Core.Models.Hosts;
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using ProxySuper.Core.Models.Projects;
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using Renci.SshNet;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Navigation;
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namespace ProxySuper.Core.Services
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{
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public enum ArchType
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{
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x86,
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arm
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}
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public enum CmdType
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{
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None,
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Yum,
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Apt,
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Dnf
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}
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public abstract class ServiceBase<TSettings> where TSettings : IProjectSettings
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{
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private Host _host;
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private SshClient _sshClient;
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private ProjectProgress _progress;
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public ServiceBase(Host host, TSettings settings)
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{
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_host = host;
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Settings = settings;
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var connection = CreateConnectionInfo();
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if (connection != null)
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{
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_sshClient = new SshClient(connection);
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}
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_progress = new ProjectProgress();
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ArchType = ArchType.x86;
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CmdType = CmdType.None;
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IPv4 = string.Empty;
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IPv6 = string.Empty;
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IsOnlyIPv6 = false;
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NavigationService = Mvx.IoCProvider.Resolve<IMvxNavigationService>();
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}
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public string RunCmd(string command)
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{
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AppendCommand(command);
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string result;
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if (_sshClient.IsConnected)
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{
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result = _sshClient.CreateCommand(command).Execute();
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}
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else
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{
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result = "连接已断开";
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}
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AppendCommand(result);
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return result;
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}
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public ProjectProgress Progress => _progress;
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public TSettings Settings { get; set; }
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public ArchType ArchType { get; set; }
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public CmdType CmdType { get; set; }
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public string IPv4 { get; set; }
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public string IPv6 { get; set; }
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public bool IsOnlyIPv6 { get; set; }
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public IMvxNavigationService NavigationService { get; set; }
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#region 公用方法
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public void Connect()
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{
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Task.Run(() =>
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{
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if (_sshClient == null)
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{
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MessageBox.Show("无法建立连接，连接参数有误！");
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return;
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}
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if (_sshClient.IsConnected == false)
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{
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Progress.Desc = ("正在与服务器建立连接");
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try
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{
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_sshClient.Connect();
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Progress.Desc = ("建立连接成功");
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}
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catch (Exception e)
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{
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Progress.Desc = ("连接失败，" + e.Message);
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}
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}
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});
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}
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public void Disconnect()
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{
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Task.Run(() =>
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{
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_sshClient?.Disconnect();
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});
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}
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protected void WriteToFile(string text, string path)
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{
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using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(text)))
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{
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using (var sftp = new SftpClient(_sshClient.ConnectionInfo))
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{
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try
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{
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sftp.Connect();
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sftp.UploadFile(stream, path, true);
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}
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catch (Exception ex)
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{
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throw ex;
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}
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finally
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{
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sftp.Disconnect();
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}
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}
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}
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}
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protected bool FileExists(string path)
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{
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var cmdStr = $"if [[ -f {path} ]];then echo '1';else echo '0'; fi";
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var cmd = RunCmd(cmdStr);
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return cmd.Trim() == "1";
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}
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protected void SyncTimeDiff()
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{
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RunCmd("rm -f /etc/localtime");
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RunCmd("ln -s /usr/share/zoneinfo/UTC /etc/localtime");
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var result = RunCmd("date +%s");
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var vpsSeconds = Convert.ToInt64(result);
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var localSeconds = (int)(DateTime.Now.ToUniversalTime() - DateTime.Parse("1970-01-01")).TotalSeconds;
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if (Math.Abs(vpsSeconds - localSeconds) >= 90)
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{
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// 同步本地时间
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var netUtcTime = DateTimeUtils.GetUTCTime();
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DateTimeUtils.SetDate(netUtcTime.ToLocalTime());
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// 同步VPS时间
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var utcTS = DateTimeUtils.GetUTCTime() - new DateTime(1970, 1, 1, 0, 0, 0, 0);
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long timeStampVPS = Convert.ToInt64(utcTS.TotalSeconds);
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RunCmd($"date --set=\"$(date \"+%Y-%m-%d %H:%M:%S\" -d @{timeStampVPS.ToString()})\"");
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}
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}
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protected void ValidateDomain()
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{
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var domainIP = RunCmd($"ping \"{Settings.Domain}\" -c 1" + @" | sed '1{s/[^(]*(//;s/).*//;q}'")
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.Trim('\r', '\n');
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if (IsOnlyIPv6)
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{
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Progress.Desc = ($"本机IP({IPv6})");
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if (IPv6 != domainIP)
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{
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throw new Exception("域名解析地址与服务器IP不匹配！");
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}
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}
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else
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{
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Progress.Desc = ($"本机IP({IPv4})");
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Progress.Desc = ($"域名IP({domainIP})");
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if (IPv4 != domainIP)
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{
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throw new Exception("域名解析地址与服务器IP不匹配！");
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}
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}
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}
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protected void EnableBBR()
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{
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Progress.Desc = ("检查系统是否满足启动BBR条件");
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var osVersion = RunCmd("uname -r");
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var canInstallBBR = CheckKernelVersionBBR(osVersion.Split('-')[0]);
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var bbrInfo = RunCmd("sysctl net.ipv4.tcp_congestion_control | grep bbr");
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var installed = bbrInfo.Contains("bbr");
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if (canInstallBBR && !installed)
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{
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RunCmd(@"bash -c 'echo ""net.core.default_qdisc=fq"" >> /etc/sysctl.conf'");
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RunCmd(@"bash -c 'echo ""net.ipv4.tcp_congestion_control=bbr"" >> /etc/sysctl.conf'");
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RunCmd(@"sysctl -p");
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if (IsOnlyIPv6)
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{
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RemoveNat64();
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}
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Progress.Desc = ("启动BBR成功");
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}
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if (!canInstallBBR)
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{
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Progress.Desc = ("系统不满足启用BBR条件，启动失败。");
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}
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}
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/// <summary>
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/// 安装证书
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/// </summary>
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/// <param name="certPath"></param>
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/// <param name="keyPath"></param>
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protected void InstallCert(string dirPath, string certName, string keyName)
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{
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string certPath = dirPath + "/" + certName;
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string keyPath = dirPath + "/" + keyName;
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Progress.Desc = ("安装Acme软件");
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#region 安装Acme
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// 安装依赖
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RunCmd(GetInstallCmd("socat"));
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// 解决搬瓦工CentOS缺少问题
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RunCmd(GetInstallCmd("automake autoconf libtool"));
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// 安装Acme
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var result = RunCmd($"curl https://get.acme.sh yes | sh");
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if (!result.Contains("nstall success"))
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{
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throw new Exception("安装 Acme 失败，请联系开发者！");
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}
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RunCmd("alias acme.sh=~/.acme.sh/acme.sh");
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#endregion
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#region 申请证书
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Progress.Desc = ("正在申请证书");
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// 申请证书
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var cmd = $"/root/.acme.sh/acme.sh --force --debug --issue --standalone -d {Settings.Domain} {(IsOnlyIPv6 ? "--listen-v6" : "")} --pre-hook \"systemctl stop caddy\" --post-hook \"systemctl start caddy\" --server letsencrypt";
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result = RunCmd(cmd);
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if (result.Contains("success"))
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{
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Progress.Desc = ("申请证书成功");
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}
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else
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{
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Progress.Desc = ("申请证书失败，如果申请次数过多请更换二级域名，或联系开发者！");
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throw new Exception("申请证书失败，如果申请次数过多请更换二级域名，或联系开发者！");
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}
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#endregion
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// 安装证书
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Progress.Desc = ("安装TLS证书");
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RunCmd($"mkdir -p {dirPath}");
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RunCmd($"/root/.acme.sh/acme.sh --installcert -d {Settings.Domain} --certpath {certPath} --keypath {keyPath} --capath {certPath}");
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result = RunCmd($@"if [ ! -f ""{keyPath}"" ]; then echo ""0""; else echo ""1""; fi | head -n 1");
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if (result.Contains("1"))
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{
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Progress.Desc = ("安装证书成功");
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}
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else
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{
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Progress.Desc = ("安装证书失败，请联系开发者！");
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throw new Exception("安装证书失败，请联系开发者！");
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}
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RunCmd($"chmod 755 {dirPath}");
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}
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protected void UploadFile(Stream stream, string path)
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{
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using (var sftp = new SftpClient(_sshClient.ConnectionInfo))
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{
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sftp.Connect();
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sftp.UploadFile(stream, path, true);
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sftp.Disconnect();
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}
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}
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public void EnsureRootUser()
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{
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// 禁止一些可能产生的干扰信息
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RunCmd(@"sed -i 's/echo/#echo/g' ~/.bashrc");
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RunCmd(@"sed -i 's/echo/#echo/g' ~/.profile");
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var result = RunCmd("id -u");
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if (!result.Equals("0\n"))
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{
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throw new Exception("ProxySU需要使用Root用户进行安装！");
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}
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}
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public void UninstallCaddy()
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{
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Progress.Desc = "关闭Caddy服务";
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RunCmd("systemctl stop caddy");
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RunCmd("systemctl disable caddy");
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Progress.Desc = "彻底删除Caddy文件";
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RunCmd("rm -rf /etc/systemd/system/caddy.service");
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RunCmd("rm -rf /usr/bin/caddy");
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RunCmd("rm -rf /usr/share/caddy");
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RunCmd("rm -rf /etc/caddy");
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}
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public void EnsureSystemEnv()
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{
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// cpu架构
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Progress.Desc = ("检测CPU架构");
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EnsureCPU();
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// 安装命令类型
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Progress.Desc = ("检测系统安装命令");
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EnsureCmdType();
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// systemctl
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Progress.Desc = ("检测Systemctl");
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EnsureSystemctl();
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// SELinux
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Progress.Desc = ("检测SELinux");
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ConfigSELinux();
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}
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public void InstallSystemTools()
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{
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Progress.Desc = ("安装sudo工具");
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InstallSoftware("sudo");
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Progress.Desc = ("安装curl工具");
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InstallSoftware("curl");
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Progress.Desc = ("安装wget工具");
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InstallSoftware("wget");
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Progress.Desc = ("安装ping工具");
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InstallSoftware("ping");
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Progress.Desc = ("安装unzip工具");
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InstallSoftware("unzip");
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Progress.Desc = ("安装cron工具");
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InstallSoftware("cron");
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Progress.Desc = ("安装lsof工具");
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InstallSoftware("lsof");
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Progress.Desc = ("安装systemd工具");
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InstallSoftware("systemd");
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}
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public void ConfigFirewalld()
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{
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Progress.Desc = ("释放被占用的端口");
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Settings.FreePorts.ForEach(port => SetPortFree(port));
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Progress.Desc = ("开放需要的端口");
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OpenPort(Settings.FreePorts.ToArray());
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}
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public void ResetFirewalld()
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{
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ClosePort(Settings.FreePorts.ToArray());
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}
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public void EnsureNetwork()
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{
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string cmd;
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Progress.Desc = ("检测IPv4");
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cmd = RunCmd(@"curl -s https://api.ip.sb/ip --ipv4 --max-time 8");
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IPv4 = cmd.TrimEnd('\r', '\n');
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Progress.Desc = ($"IPv4地址为{IPv4}");
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if (!string.IsNullOrEmpty(IPv4))
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{
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IsOnlyIPv6 = false;
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}
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else
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{
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Progress.Desc = ("检测IPv6");
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cmd = RunCmd(@"curl -s https://api.ip.sb/ip --ipv6 --max-time 8");
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IPv6 = cmd.TrimEnd('\r', '\n');
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Progress.Desc = ($"IPv6地址为{IPv6}");
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IsOnlyIPv6 = true;
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SetNat64();
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}
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if (string.IsNullOrEmpty(IPv4) && string.IsNullOrEmpty(IPv6))
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{
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throw new Exception("未检测到服务器公网IP，请检查网络或重试。");
|
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}
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}
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public void InstallCaddy()
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{
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RunCmd("rm -rf caddy.tar.gz");
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RunCmd("rm -rf /etc/caddy");
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RunCmd("rm -rf /usr/share/caddy");
|
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|
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var url = "https://github.com/caddyserver/caddy/releases/download/v2.4.3/caddy_2.4.3_linux_amd64.tar.gz";
|
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if (ArchType == ArchType.arm)
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{
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url = "https://github.com/caddyserver/caddy/releases/download/v2.4.3/caddy_2.4.3_linux_armv7.tar.gz";
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}
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RunCmd($"wget -O caddy.tar.gz {url}");
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RunCmd("mkdir /etc/caddy");
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RunCmd("tar -zxvf caddy.tar.gz -C /etc/caddy");
|
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RunCmd("cp -rf /etc/caddy/caddy /usr/bin");
|
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WriteToFile(Caddy.DefaultCaddyFile, "/etc/caddy/Caddyfile");
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WriteToFile(Caddy.Service, "/etc/systemd/system/caddy.service");
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RunCmd("systemctl daemon-reload");
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RunCmd("systemctl enable caddy");
|
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|
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RunCmd("mkdir /usr/share/caddy");
|
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RunCmd("chmod 775 /usr/share/caddy");
|
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|
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if (!FileExists("/usr/bin/caddy"))
|
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{
|
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throw new Exception("Caddy服务器安装失败，请联系开发者！");
|
||
}
|
||
}
|
||
#endregion
|
||
|
||
|
||
#region 检测System环境
|
||
private void EnsureCPU()
|
||
{
|
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var result = RunCmd("uname -m");
|
||
if (result.Contains("x86"))
|
||
{
|
||
ArchType = ArchType.x86;
|
||
}
|
||
else if (result.Contains("arm") || result.Contains("arch"))
|
||
{
|
||
ArchType = ArchType.arm;
|
||
}
|
||
}
|
||
|
||
private void EnsureCmdType()
|
||
{
|
||
var result = string.Empty;
|
||
|
||
if (CmdType == CmdType.None)
|
||
{
|
||
result = RunCmd("command -v apt");
|
||
if (!string.IsNullOrEmpty(result))
|
||
{
|
||
CmdType = CmdType.Apt;
|
||
}
|
||
}
|
||
|
||
if (CmdType == CmdType.None)
|
||
{
|
||
result = RunCmd("command -v dnf");
|
||
if (!string.IsNullOrEmpty(result))
|
||
{
|
||
CmdType = CmdType.Dnf;
|
||
}
|
||
}
|
||
|
||
if (CmdType == CmdType.None)
|
||
{
|
||
result = RunCmd("command -v yum");
|
||
if (!string.IsNullOrEmpty(result))
|
||
{
|
||
CmdType = CmdType.Yum;
|
||
}
|
||
}
|
||
|
||
if (CmdType == CmdType.None)
|
||
{
|
||
throw new Exception("未检测到正确的系统安装命令，请尝试使用ProxySU推荐的系统版本安装！");
|
||
}
|
||
}
|
||
|
||
private void EnsureSystemctl()
|
||
{
|
||
var result = RunCmd("command -v systemctl");
|
||
if (string.IsNullOrEmpty(result))
|
||
{
|
||
throw new Exception("系统缺少 systemctl 组件，请尝试使用ProxySU推荐的系统版本安装！");
|
||
}
|
||
}
|
||
|
||
private void ConfigSELinux()
|
||
{
|
||
// SELinux
|
||
var result = RunCmd("command -v getenforce");
|
||
var isSELinux = !string.IsNullOrEmpty(result);
|
||
|
||
// 判断是否启用了SELinux,如果启用了，并且工作在Enforcing模式下，则改为Permissive模式
|
||
if (isSELinux)
|
||
{
|
||
result = RunCmd("getenforce");
|
||
|
||
// 检测到系统启用SELinux，且工作在严格模式下，需改为宽松模式
|
||
if (result.Contains("Enforcing"))
|
||
{
|
||
RunCmd("setenforce 0");
|
||
RunCmd(@"sed -i 's/SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config");
|
||
}
|
||
}
|
||
}
|
||
#endregion
|
||
|
||
|
||
#region 私有方法
|
||
|
||
protected void SetNat64()
|
||
{
|
||
var dns64List = FilterFastestIP();
|
||
if (dns64List.Count == 0)
|
||
{
|
||
throw new Exception("未找到有效的Nat64网关");
|
||
}
|
||
|
||
var exists = FileExists("/etc/resolv.conf.proxysu");
|
||
if (!exists)
|
||
{
|
||
var cmdStr = @"mv /etc/resolv.conf /etc/resolv.conf.proxysu";
|
||
RunCmd(cmdStr);
|
||
}
|
||
|
||
foreach (var gateip in dns64List)
|
||
{
|
||
RunCmd($"echo \"nameserver {gateip}\" > /etc/resolv.conf");
|
||
}
|
||
}
|
||
|
||
protected void RemoveNat64()
|
||
{
|
||
RunCmd("rm /etc/resolv.conf");
|
||
RunCmd("mv /etc/resolv.conf.proxysu /etc/resolv.conf");
|
||
}
|
||
|
||
protected void AppendCommand(string command)
|
||
{
|
||
if (!command.EndsWith("\n"))
|
||
{
|
||
command += "\n";
|
||
}
|
||
Progress.Logs += command;
|
||
}
|
||
|
||
private List<string> FilterFastestIP()
|
||
{
|
||
string[] gateNat64 = {
|
||
"2a01:4f9:c010:3f02::1",
|
||
"2001:67c:2b0::4",
|
||
"2001:67c:2b0::6",
|
||
"2a09:11c0:f1:bbf0::70",
|
||
"2a01:4f8:c2c:123f::1",
|
||
"2001:67c:27e4:15::6411",
|
||
"2001:67c:27e4::64",
|
||
"2001:67c:27e4:15::64",
|
||
"2001:67c:27e4::60",
|
||
"2a00:1098:2b::1",
|
||
"2a03:7900:2:0:31:3:104:161",
|
||
"2a00:1098:2c::1",
|
||
"2a09:11c0:100::53",
|
||
};
|
||
|
||
Dictionary<string, float> dns64List = new Dictionary<string, float>();
|
||
foreach (var gateip in gateNat64)
|
||
{
|
||
var cmdStr = $"ping6 -c4 {gateip} | grep avg | awk '{{print $4}}'|cut -d/ -f2";
|
||
var cmd = RunCmd(cmdStr);
|
||
if (!string.IsNullOrEmpty(cmd))
|
||
{
|
||
if (float.TryParse(cmd, out float delay))
|
||
{
|
||
dns64List.Add(gateip, delay);
|
||
}
|
||
}
|
||
}
|
||
|
||
return dns64List.Keys.ToList();
|
||
}
|
||
|
||
private bool CheckKernelVersionBBR(string kernelVer)
|
||
{
|
||
string[] linuxKernelCompared = kernelVer.Split('.');
|
||
if (int.Parse(linuxKernelCompared[0]) > 4)
|
||
{
|
||
return true;
|
||
}
|
||
else if (int.Parse(linuxKernelCompared[0]) < 4)
|
||
{
|
||
return false;
|
||
}
|
||
else if (int.Parse(linuxKernelCompared[0]) == 4)
|
||
{
|
||
if (int.Parse(linuxKernelCompared[1]) >= 9)
|
||
{
|
||
return true;
|
||
}
|
||
else if (int.Parse(linuxKernelCompared[1]) < 9)
|
||
{
|
||
return false;
|
||
}
|
||
|
||
}
|
||
return false;
|
||
|
||
}
|
||
|
||
private void SetPortFree(int port)
|
||
{
|
||
string result = RunCmd($"lsof -n -P -i :{port} | grep LISTEN");
|
||
|
||
if (!string.IsNullOrEmpty(result))
|
||
{
|
||
string[] process = result.Split(' ');
|
||
RunCmd($"systemctl stop {process[0]}");
|
||
RunCmd($"systemctl disable {process[0]}");
|
||
RunCmd($"pkill {process[0]}");
|
||
}
|
||
}
|
||
|
||
private void OpenPort(params int[] portList)
|
||
{
|
||
string cmd;
|
||
|
||
cmd = RunCmd("command -v firewall-cmd");
|
||
if (!string.IsNullOrEmpty(cmd))
|
||
{
|
||
//有很奇怪的vps主机，在firewalld未运行时，端口是关闭的，无法访问。所以要先启动firewalld
|
||
//用于保证acme.sh申请证书成功
|
||
cmd = RunCmd("firewall-cmd --state");
|
||
if (cmd.Trim() != "running")
|
||
{
|
||
RunCmd("systemctl restart firewalld");
|
||
}
|
||
|
||
// 保持 ssh 端口开放
|
||
RunCmd($"firewall-cmd --add-port={_host.Port}/tcp --permanent");
|
||
foreach (var port in portList)
|
||
{
|
||
RunCmd($"firewall-cmd --add-port={port}/tcp --permanent");
|
||
RunCmd($"firewall-cmd --add-port={port}/udp --permanent");
|
||
}
|
||
|
||
RunCmd("yes | firewall-cmd --reload");
|
||
}
|
||
else
|
||
{
|
||
cmd = RunCmd("command -v ufw");
|
||
if (string.IsNullOrEmpty(cmd))
|
||
{
|
||
RunCmd(GetInstallCmd("ufw"));
|
||
RunCmd("echo y | ufw enable");
|
||
}
|
||
|
||
// 保持 ssh 端口开放
|
||
RunCmd($"ufw allow {_host.Port}/tcp");
|
||
foreach (var port in portList)
|
||
{
|
||
RunCmd($"ufw allow {port}/tcp");
|
||
RunCmd($"ufw allow {port}/udp");
|
||
}
|
||
RunCmd("yes | ufw reload");
|
||
}
|
||
}
|
||
|
||
private void ClosePort(params int[] portList)
|
||
{
|
||
string cmd;
|
||
|
||
cmd = RunCmd("command -v firewall-cmd");
|
||
if (!string.IsNullOrEmpty(cmd))
|
||
{
|
||
//有很奇怪的vps主机，在firewalld未运行时，端口是关闭的，无法访问。所以要先启动firewalld
|
||
//用于保证acme.sh申请证书成功
|
||
cmd = RunCmd("firewall-cmd --state");
|
||
if (cmd.Trim() != "running")
|
||
{
|
||
RunCmd("systemctl restart firewalld");
|
||
}
|
||
|
||
foreach (var port in portList)
|
||
{
|
||
RunCmd($"firewall-cmd --remove-port={port}/tcp --permanent");
|
||
RunCmd($"firewall-cmd --remove-port={port}/udp --permanent");
|
||
}
|
||
RunCmd("yes | firewall-cmd --reload");
|
||
}
|
||
else
|
||
{
|
||
cmd = RunCmd("command -v ufw");
|
||
if (!string.IsNullOrEmpty(cmd))
|
||
{
|
||
foreach (var port in portList)
|
||
{
|
||
RunCmd($"ufw delete allow {port}/tcp");
|
||
RunCmd($"ufw delete allow {port}/udp");
|
||
}
|
||
RunCmd("yes | ufw reload");
|
||
}
|
||
}
|
||
}
|
||
|
||
private void InstallSoftware(string software)
|
||
{
|
||
var result = RunCmd($"command -v {software}");
|
||
if (string.IsNullOrEmpty(result))
|
||
{
|
||
RunCmd(GetInstallCmd(software));
|
||
}
|
||
}
|
||
|
||
private string GetInstallCmd(string soft)
|
||
{
|
||
if (CmdType == CmdType.Apt)
|
||
{
|
||
return $"apt install -y {soft}";
|
||
}
|
||
else if (CmdType == CmdType.Yum)
|
||
{
|
||
return $"yum install -y {soft}";
|
||
}
|
||
else
|
||
{
|
||
return $"dnf install -y {soft}";
|
||
}
|
||
}
|
||
|
||
|
||
private ConnectionInfo CreateConnectionInfo()
|
||
{
|
||
try
|
||
{
|
||
var authMethods = new List<AuthenticationMethod>();
|
||
|
||
if (_host.SecretType == LoginSecretType.Password)
|
||
{
|
||
authMethods.Add(new PasswordAuthenticationMethod(_host.UserName, _host.Password));
|
||
}
|
||
|
||
if (_host.SecretType == LoginSecretType.PrivateKey)
|
||
{
|
||
PrivateKeyFile keyFile;
|
||
if (string.IsNullOrEmpty(_host.Password))
|
||
{
|
||
keyFile = new PrivateKeyFile(_host.PrivateKeyPath);
|
||
}
|
||
else
|
||
{
|
||
keyFile = new PrivateKeyFile(_host.PrivateKeyPath, _host.Password);
|
||
}
|
||
authMethods.Add(new PrivateKeyAuthenticationMethod(_host.UserName, keyFile));
|
||
}
|
||
|
||
if (_host.Proxy.Type == ProxyTypes.None)
|
||
{
|
||
return new ConnectionInfo(
|
||
host: _host.Address,
|
||
username: _host.UserName,
|
||
authenticationMethods: authMethods.ToArray());
|
||
}
|
||
|
||
return new ConnectionInfo(
|
||
host: _host.Address,
|
||
port: _host.Port,
|
||
username: _host.UserName,
|
||
proxyType: _host.Proxy.Type,
|
||
proxyHost: _host.Proxy.Address,
|
||
proxyPort: _host.Proxy.Port,
|
||
proxyUsername: _host.Proxy.UserName, proxyPassword: _host.Proxy.Password,
|
||
authenticationMethods: authMethods.ToArray());
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
MessageBox.Show(ex.Message);
|
||
return null;
|
||
}
|
||
}
|
||
#endregion
|
||
}
|
||
}
|