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https://github.com/fergalmoran/DnsServer.git
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AutoPtr: added new app.
This commit is contained in:
Shreyas Zare
144
Apps/AutoPtrApp/App.cs
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144
Apps/AutoPtrApp/App.cs
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@@ -0,0 +1,144 @@
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/*
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Technitium DNS Server
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Copyright (C) 2023 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.ApplicationCommon;
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using System.Net;
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using System.Net.Sockets;
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using System.Text.Json;
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using System.Threading.Tasks;
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using TechnitiumLibrary.Net;
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using TechnitiumLibrary.Net.Dns;
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using TechnitiumLibrary.Net.Dns.ResourceRecords;
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namespace AutoPtr
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{
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public class App : IDnsApplication, IDnsAppRecordRequestHandler
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{
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#region IDisposable
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public void Dispose()
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{
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//do nothing
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}
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#endregion
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#region public
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public Task InitializeAsync(IDnsServer dnsServer, string config)
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{
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return Task.CompletedTask;
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}
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public Task<DnsDatagram> ProcessRequestAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, bool isRecursionAllowed, string zoneName, string appRecordName, uint appRecordTtl, string appRecordData)
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{
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DnsQuestionRecord question = request.Question[0];
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if (question.Type != DnsResourceRecordType.PTR)
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return Task.FromResult<DnsDatagram>(null);
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string qname = question.Name;
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if (qname.Length == appRecordName.Length)
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return Task.FromResult<DnsDatagram>(null);
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if (!IPAddressExtensions.TryParseReverseDomain(qname, out IPAddress address))
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return Task.FromResult<DnsDatagram>(null);
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string domain = null;
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using (JsonDocument jsonDocument = JsonDocument.Parse(appRecordData))
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{
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JsonElement jsonAppRecordData = jsonDocument.RootElement;
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string ipSeparator;
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if (jsonAppRecordData.TryGetProperty("ipSeparator", out JsonElement jsonSeparator) && (jsonSeparator.ValueKind != JsonValueKind.Null))
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ipSeparator = jsonSeparator.ToString();
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else
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ipSeparator = string.Empty;
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switch (address.AddressFamily)
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{
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case AddressFamily.InterNetwork:
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{
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byte[] buffer = address.GetAddressBytes();
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foreach (byte b in buffer)
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{
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if (domain is null)
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domain = b.ToString();
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else
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domain += ipSeparator + b.ToString();
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}
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}
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break;
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case AddressFamily.InterNetworkV6:
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{
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byte[] buffer = address.GetAddressBytes();
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for (int i = 0; i < buffer.Length; i += 2)
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{
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if (domain is null)
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domain = buffer[i].ToString("x2") + buffer[i + 1].ToString("x2");
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else
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domain += ipSeparator + buffer[i].ToString("x2") + buffer[i + 1].ToString("x2");
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}
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}
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break;
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default:
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return Task.FromResult<DnsDatagram>(null);
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}
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if (jsonAppRecordData.TryGetProperty("prefix", out JsonElement jsonPrefix) && (jsonPrefix.ValueKind != JsonValueKind.Null))
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domain = jsonPrefix.GetString() + domain;
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if (jsonAppRecordData.TryGetProperty("suffix", out JsonElement jsonSuffix) && (jsonSuffix.ValueKind != JsonValueKind.Null))
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domain += jsonSuffix.GetString();
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}
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DnsResourceRecord[] answer = new DnsResourceRecord[] { new DnsResourceRecord(qname, DnsResourceRecordType.PTR, DnsClass.IN, appRecordTtl, new DnsPTRRecordData(domain)) };
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return Task.FromResult(new DnsDatagram(request.Identifier, true, request.OPCODE, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, answer));
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}
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#endregion
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#region properties
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public string Description
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{ get { return "Returns automatically generated response for a PTR request for both IPv4 and IPv6."; } }
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public string ApplicationRecordDataTemplate
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{
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get
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{
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return @"{
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""prefix"": """",
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""suffix"": "".example.com"",
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""ipSeparator"": ""-""
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}";
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}
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}
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#endregion
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}
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}
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39
Apps/AutoPtrApp/AutoPtrApp.csproj
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39
Apps/AutoPtrApp/AutoPtrApp.csproj
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net7.0</TargetFramework>
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<AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
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<CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
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<Version>1.0</Version>
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<Company>Technitium</Company>
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<Product>Technitium DNS Server</Product>
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<Authors>Shreyas Zare</Authors>
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<AssemblyName>AutoPtrApp</AssemblyName>
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<RootNamespace>AutoPtr</RootNamespace>
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<PackageProjectUrl>https://technitium.com/dns/</PackageProjectUrl>
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<RepositoryUrl>https://github.com/TechnitiumSoftware/DnsServer</RepositoryUrl>
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<Description>Allows creating APP records in a primary and forwarder zones that can return automatically generated response for a PTR request for both IPv4 and IPv6.</Description>
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<GeneratePackageOnBuild>false</GeneratePackageOnBuild>
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<OutputType>Library</OutputType>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\..\DnsServerCore.ApplicationCommon\DnsServerCore.ApplicationCommon.csproj">
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<Private>false</Private>
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</ProjectReference>
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</ItemGroup>
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<ItemGroup>
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<Reference Include="TechnitiumLibrary.Net">
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<HintPath>..\..\..\TechnitiumLibrary\bin\TechnitiumLibrary.Net.dll</HintPath>
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<Private>false</Private>
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</Reference>
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</ItemGroup>
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<ItemGroup>
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<None Update="dnsApp.config">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>
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1
Apps/AutoPtrApp/dnsApp.config
Normal file
1
Apps/AutoPtrApp/dnsApp.config
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@@ -0,0 +1 @@
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#This app requires no config.
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