private Task SOnQueryReceived(object sender, QueryReceivedEventArgs eventargs)
{
var dnsMessage = eventargs.Query as DnsMessage;
if (dnsMessage == null)
{
return(Task.CompletedTask);
}
var unknowQuestion = false;
foreach (var question in dnsMessage.Questions)
{
Console.WriteLine($"Request {question.RecordType} for {question.Name}");
if (question.RecordType != RecordType.Naptr &&
question.RecordType != RecordType.A &&
question.RecordType != RecordType.Txt &&
question.RecordType != RecordType.Ptr &&
question.RecordType != RecordType.Aaaa)
{
unknowQuestion = true;
break;
}
var query = question.Name.ToString();
var smlRequest = SmlRequest.Parse(query);
var smpRecord = this.Find(smlRequest);
var response = new DnsMessage();
if (smpRecord != null)
{
List <DnsRecordBase> answers = new List <DnsRecordBase>();
if (question.RecordType == RecordType.A ||
question.RecordType == RecordType.Ptr ||
question.RecordType == RecordType.Aaaa ||
question.RecordType == RecordType.Txt)
{
response.IsEDnsEnabled = true;
response.IsRecursionDesired = true;
response.IsQuery = true;
response.ReturnCode = ReturnCode.NotImplemented;
}
else if (question.RecordType == RecordType.Naptr)
{
string services = "Meta:SMP";
string flags = "U";
string regExp = smpRecord.RegExp;
NaptrRecord rec = new NaptrRecord(question.Name, 1000, 0, 0, flags, services, regExp, null);
answers.Add(rec);
}
else
{
throw new NotSupportedException($"RecordType not suppoerted '{question.RecordType}'");
}
response.AnswerRecords.AddRange(answers);
eventargs.Response = response;
}
}
if (unknowQuestion)
{
return(Task.CompletedTask);
}
return(Task.CompletedTask);
}
private SmpRecord Find(SmlRequest request)
{
return(this.options.Directory.SmpRecords
.FirstOrDefault(x => x.Hash == request.Hash && x.Scheme == request.Scheme));
}