public static RecordType DeserializeRecordType(byte[] bytes, int start)
{
int val = DnsQuestionBinarySerializer.Read2BytesAsInt(bytes, start);
val--;
return((RecordType)val);
}
public DnsMessageBinarySerializer(ResourceRecordBinarySerializer rrSer, DnsQuestionBinarySerializer qSerializer)
{
this.rrSerializer = rrSer ?? throw new ArgumentNullException(nameof(rrSer));
this.qSerializer = qSerializer ?? throw new ArgumentNullException(nameof(qSerializer));
}
public ResourceRecord FromBytes(byte[] bytes, int start, out int totalBytesRead)
{
var name = this.dnsSerializer.ParseQuestionName(bytes, start, out var bytesRead);
totalBytesRead = bytesRead;
var recordType = DeserializeRecordType(bytes, start + totalBytesRead);
totalBytesRead += 2;
// count the record class bytes.
totalBytesRead += 2;
var timeToLive = Read4BytesAsInt(bytes, start + totalBytesRead);
totalBytesRead += 4;
var length = DnsQuestionBinarySerializer.Read2BytesAsInt(bytes, start + totalBytesRead);
totalBytesRead += 2;
ResourceRecord result = null;
switch (recordType)
{
case RecordType.A:
result = new ARecord()
{
Name = name,
TimeToLive = timeToLive,
Address = new System.Net.IPAddress(new ReadOnlySpan <byte>(bytes, start + totalBytesRead, 4)),
};
break;
case RecordType.CNAME:
result = new CNameRecord()
{
Name = name,
TimeToLive = timeToLive,
CName = this.dnsSerializer.ParseQuestionName(bytes, start + totalBytesRead, out var cnameBytesRead),
};
break;
case RecordType.NS:
result = new NSRecord()
{
Name = name,
TimeToLive = timeToLive,
DName = this.dnsSerializer.ParseQuestionName(bytes, start + totalBytesRead, out var dnameBytesRead),
};
break;
case RecordType.MX:
result = this.DeserializeMxRr(name, timeToLive, bytes, start + totalBytesRead, out var rdataSize);
break;
case RecordType.PTR:
result = this.DeserializePtrRr(name, timeToLive, bytes, start + totalBytesRead, out var ptrSize);
break;
case RecordType.TXT:
result = this.DeserializeTxtRr(name, timeToLive, bytes, start + totalBytesRead, length, out var txtSize);
break;
case RecordType.SOA:
result = this.DeserializeSoaRr(name, timeToLive, bytes, start + totalBytesRead, out var soaSize);
break;
default:
Console.WriteLine($"Deserialization of recordType {recordType} is not yet implemented.");
result = null;
break;
}
totalBytesRead += length;
return(result);
}
public ResourceRecordBinarySerializer(DnsQuestionBinarySerializer dnsSerializer)
{
this.dnsSerializer = dnsSerializer;
}