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AutoPTR: updated implementation to return correct RCODE for all cases.

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This commit is contained in:
Shreyas Zare
2023-07-09 15:53:26 +05:30
parent 7c1fd1b6cf
commit 01198a6958
1 changed files with 21 additions and 9 deletions
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30
Apps/AutoPtrApp/App.cs
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@@ -30,6 +30,12 @@ namespace AutoPtr
{
public class App : IDnsApplication, IDnsAppRecordRequestHandler
{
#region variables
IDnsServer _dnsServer;
#endregion
#region IDisposable
public void Dispose()
@@ -43,23 +49,29 @@ namespace AutoPtr
public Task InitializeAsync(IDnsServer dnsServer, string config)
{
_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)
{
DnsQuestionRecord question = request.Question[0];
if (question.Type != DnsResourceRecordType.PTR)
return Task.FromResult<DnsDatagram>(null);
string qname = question.Name;
if (qname.Length == appRecordName.Length)
return Task.FromResult<DnsDatagram>(null);
return null;
if (!IPAddressExtensions.TryParseReverseDomain(qname, out IPAddress address))
return Task.FromResult<DnsDatagram>(null);
return null;
if (question.Type != DnsResourceRecordType.PTR)
{
//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);
}
string domain = null;
@@ -105,7 +117,7 @@ namespace AutoPtr
break;
default:
return Task.FromResult<DnsDatagram>(null);
return null;
}
if (jsonAppRecordData.TryGetProperty("prefix", out JsonElement jsonPrefix) && (jsonPrefix.ValueKind != JsonValueKind.Null))
@@ -117,7 +129,7 @@ namespace AutoPtr
DnsResourceRecord[] answer = new DnsResourceRecord[] { new DnsResourceRecord(qname, DnsResourceRecordType.PTR, DnsClass.IN, appRecordTtl, new DnsPTRRecordData(domain)) };
return Task.FromResult(new DnsDatagram(request.Identifier, true, request.OPCODE, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, answer));
return new DnsDatagram(request.Identifier, true, request.OPCODE, true, false, request.RecursionDesired, isRecursionAllowed, false, false, DnsResponseCode.NoError, request.Question, answer);
}
#endregion