public void TestSerializeCNAMERecord()
{
Tuple <MemoryStream, DNSOutputStream> out_info = DNSOutput();
var record = new CNAMEResource(new Domain("www.example.com"));
record.Serialize(out_info.Item2);
var record_bytes = out_info.Item1.ToArray();
var expected = new byte[]
{
3, // Length of www
119,
119,
119,
7, // Length of example
101,
120,
97,
109,
112,
108,
101,
3, // Length of com
99,
111,
109,
0
};
Assert.That(record_bytes, Is.EqualTo(expected));
}
public void TestUnserializeCNAMEResource()
{
var stream = DNSInput(new byte[] { 3, 119, 119, 119, 7, 101, 120, 97, 109, 112, 108, 101, 3, 99, 111, 109, 0 });
var resource = CNAMEResource.Unserialize(stream, 4);
var expected = new CNAMEResource(new Domain("www.example.com"));
Assert.That(resource, Is.EqualTo(expected));
}
/**
* Decodes the raw bytes of a DNS resource record into an
* object.
*/
public static DNSRecord Unserialize(DNSInputStream stream)
{
var name = stream.ReadDomain();
var record_type = (ResourceRecordType)stream.ReadUInt16();
var class_type = (AddressClass)stream.ReadUInt16();
var ttl = stream.ReadUInt32();
var record_size = stream.ReadUInt16();
IDNSResource resource = null;
switch (record_type.Normalize())
{
case ResourceRecordType.HOST_ADDRESS:
resource = AResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.NAME_SERVER:
resource = NSResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.START_OF_AUTHORITY:
resource = SOAResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.CANONICAL_NAME:
resource = CNAMEResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.MAIL_EXCHANGE:
resource = MXResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.POINTER:
resource = PTRResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.HOST_6ADDRESS:
resource = AAAAResource.Unserialize(stream, record_size);
break;
case ResourceRecordType.UNSUPPORTED:
// Advance the byte counter - even if we can't parse it,
// we have to properly ignore it
stream.ReadBytes(record_size);
resource = null;
break;
}
return(new DNSRecord(name, class_type.Normalize(), ttl, resource));
}