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WildIpApp: updated app to respond with NODATA when no address was parsed to avoid NXDOMAIN response by the dns server.

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This commit is contained in:
Shreyas Zare
2023-02-05 16:22:12 +05:30
parent 9c1a5e60ef
commit 7f2e2c2720
1 changed files with 25 additions and 19 deletions
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44
Apps/WildIpApp/App.cs
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@@ -1,6 +1,6 @@
/*
Technitium DNS Server
Copyright (C) 2022 Shreyas Zare (shreyas@technitium.com)
Copyright (C) 2023 Shreyas Zare (shreyas@technitium.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -28,6 +28,12 @@ namespace WildIp
{
public class App : IDnsApplication, IDnsAppRecordRequestHandler
{
#region variables
IDnsServer _dnsServer;
#endregion
#region IDisposable
public void Dispose()
@@ -41,18 +47,19 @@ namespace WildIp
public Task InitializeAsync(IDnsServer dnsServer, string config)
{
//do nothing
_dnsServer = dnsServer;
return Task.CompletedTask;
}
public Task<DnsDatagram> ProcessRequestAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, bool isRecursionAllowed, string zoneName, string appRecordName, uint appRecordTtl, string appRecordData)
public async Task<DnsDatagram> ProcessRequestAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, bool isRecursionAllowed, string zoneName, string appRecordName, uint appRecordTtl, string appRecordData)
{
string qname = request.Question[0].Name;
if (qname.Length == appRecordName.Length)
return Task.FromResult<DnsDatagram>(null);
return null;
DnsResourceRecord answer;
DnsResourceRecord answer = null;
switch (request.Question[0].Type)
{
@@ -69,12 +76,8 @@ namespace WildIp
rawIp[i++] = x;
}
if (i < 4)
return Task.FromResult<DnsDatagram>(null);
IPAddress address = new IPAddress(rawIp);
answer = new DnsResourceRecord(request.Question[0].Name, DnsResourceRecordType.A, DnsClass.IN, appRecordTtl, new DnsARecordData(address));
if (i == 4)
answer = new DnsResourceRecord(request.Question[0].Name, DnsResourceRecordType.A, DnsClass.IN, appRecordTtl, new DnsARecordData(new IPAddress(rawIp)));
}
break;
@@ -90,18 +93,21 @@ namespace WildIp
break;
}
if (address is null)
return Task.FromResult<DnsDatagram>(null);
answer = new DnsResourceRecord(request.Question[0].Name, DnsResourceRecordType.AAAA, DnsClass.IN, appRecordTtl, new DnsAAAARecordData(address));
if (address is not null)
answer = new DnsResourceRecord(request.Question[0].Name, DnsResourceRecordType.AAAA, DnsClass.IN, appRecordTtl, new DnsAAAARecordData(address));
}
break;
default:
return Task.FromResult<DnsDatagram>(null);
}
return Task.FromResult(new DnsDatagram(request.Identifier, true, request.OPCODE, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, new DnsResourceRecord[] { answer }));
if (answer is null)
{
//NODATA reponse
DnsDatagram soaResponse = await _dnsServer.DirectQueryAsync(new DnsQuestionRecord(zoneName, DnsResourceRecordType.SOA, DnsClass.IN));
return new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, null, soaResponse.Answer);
}
return new DnsDatagram(request.Identifier, true, request.OPCODE, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, new DnsResourceRecord[] { answer });
}
#endregion