140 lines
4.2 KiB
C#
140 lines
4.2 KiB
C#
/*
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Technitium DNS Server
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Copyright (C) 2024 Shreyas Zare (shreyas@technitium.com)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using DnsServerCore;
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using Microsoft.Extensions.Hosting;
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using Microsoft.Win32;
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using System;
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using System.Reflection;
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using System.Threading;
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using System.Threading.Tasks;
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using TechnitiumLibrary.Net.Firewall;
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namespace DnsServerWindowsService
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{
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public sealed class DnsServiceWorker : BackgroundService
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{
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readonly DnsWebService _service;
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public DnsServiceWorker()
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{
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string configFolder = null;
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string[] args = Environment.GetCommandLineArgs();
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if (args.Length == 2)
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configFolder = args[1];
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_service = new DnsWebService(configFolder, new Uri("https://go.technitium.com/?id=43"), new Uri("https://go.technitium.com/?id=44"));
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}
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public override async Task StartAsync(CancellationToken cancellationToken)
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{
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CheckFirewallEntries();
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await _service.StartAsync();
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}
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public override async Task StopAsync(CancellationToken cancellationToken)
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{
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await _service.StopAsync();
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}
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public override void Dispose()
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{
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if (_service != null)
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_service.Dispose();
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}
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protected override Task ExecuteAsync(CancellationToken stoppingToken)
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{
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return Task.CompletedTask;
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}
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private static void CheckFirewallEntries()
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{
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bool autoFirewallEntry = true;
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try
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{
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#pragma warning disable CA1416 // Validate platform compatibility
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using (RegistryKey key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Technitium\DNS Server", false))
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{
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if (key is not null)
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autoFirewallEntry = Convert.ToInt32(key.GetValue("AutoFirewallEntry", 1)) == 1;
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}
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#pragma warning restore CA1416 // Validate platform compatibility
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}
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catch
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{ }
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if (autoFirewallEntry)
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{
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string appPath = Assembly.GetEntryAssembly().Location;
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if (appPath.EndsWith(".dll", StringComparison.OrdinalIgnoreCase))
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appPath = appPath.Substring(0, appPath.Length - 4) + ".exe";
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if (!WindowsFirewallEntryExists(appPath))
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AddWindowsFirewallEntry(appPath);
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}
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}
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private static bool WindowsFirewallEntryExists(string appPath)
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{
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try
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{
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return WindowsFirewall.RuleExistsVista("", appPath) == RuleStatus.Allowed;
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}
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catch
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{
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return false;
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}
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}
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private static bool AddWindowsFirewallEntry(string appPath)
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{
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try
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{
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RuleStatus status = WindowsFirewall.RuleExistsVista("", appPath);
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switch (status)
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{
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case RuleStatus.Blocked:
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case RuleStatus.Disabled:
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WindowsFirewall.RemoveRuleVista("", appPath);
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break;
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case RuleStatus.Allowed:
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return true;
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}
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WindowsFirewall.AddRuleVista("Technitium DNS Server", "Allows incoming connection request to the DNS server.", FirewallAction.Allow, appPath, Protocol.ANY, null, null, null, null, InterfaceTypeFlags.All, true, Direction.Inbound, true);
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return true;
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}
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catch
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{
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return false;
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}
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}
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}
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}
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