public static ANameRData Parse(byte[] bytes, int offset, int size)
{
ANameRData aname = new ANameRData();
uint addressBytes = BitConverter.ToUInt32(bytes, offset);
aname.Address = new IPAddress(addressBytes);
return aname;
}
public static ANameRData Parse(byte[] bytes, int offset, int size)
{
ANameRData aname = new ANameRData();
uint addressBytes = BitConverter.ToUInt32(bytes, offset);
aname.Address = new IPAddress(addressBytes);
return(aname);
}
public int LoadFrom(byte[] bytes, int offset, ushort count)
{
int currentOffset = offset;
for (int index = 0; index < count; index++)
{
// TODO: move this code into the Resource object
Resource resource = new Resource();
//// extract the domain, question type, question class and Ttl
resource.Name = DnsProtocol.ReadString(bytes, ref currentOffset);
resource.Type = (ResourceType)(BitConverter.ToUInt16(bytes, currentOffset).SwapEndian());
currentOffset += sizeof(ushort);
resource.Class = (ResourceClass)(BitConverter.ToUInt16(bytes, currentOffset).SwapEndian());
currentOffset += sizeof(ushort);
resource.TTL = BitConverter.ToUInt32(bytes, currentOffset).SwapEndian();
currentOffset += sizeof(uint);
resource.DataLength = BitConverter.ToUInt16(bytes, currentOffset).SwapEndian();
currentOffset += sizeof(ushort);
if (resource.Class == ResourceClass.IN && resource.Type == ResourceType.A)
{
resource.RData = ANameRData.Parse(bytes, currentOffset, resource.DataLength);
}
else if (resource.Type == ResourceType.CNAME)
{
resource.RData = CNameRData.Parse(bytes, currentOffset, resource.DataLength);
}
// move past resource data record
currentOffset = currentOffset + resource.DataLength;
this.Add(resource);
}
int bytesRead = currentOffset - offset;
return(bytesRead);
}
public void TransitiveQueryTest2()
{
DnsMessage message = new DnsMessage();
message.QueryIdentifier = 0xFEED;
message.QR = false;
message.Opcode = (byte) OpCode.QUERY;
message.AA = false;
message.TC = false;
message.RD = true;
message.RA = false;
message.Zero = false;
message.AuthenticatingData = false;
message.CheckingDisabled = false;
message.RCode = 0x0000;
message.QuestionCount = 1;
message.AnswerCount = 2;
message.NameServerCount = 0;
message.AdditionalCount = 0;
message.Questions = new QuestionList();
message.Questions.Add(new Question {Name = "www.msn.com", Class = ResourceClass.IN, Type = ResourceType.A});
message.Answers.Add(new Resource {Name = "8.8.8.8", Class = ResourceClass.IN, Type = ResourceType.NS, TTL = 468, DataLength = 0, RData = null});
RData data = new ANameRData {Address = IPAddress.Parse("8.8.8.9")};
message.Answers.Add(new Resource {Name = "8.8.8.9", Class = ResourceClass.IN, Type = ResourceType.NS, TTL = 468, RData = data, DataLength = (ushort) data.Length});
DnsMessage outMessage;
using (MemoryStream stream = new MemoryStream())
{
message.WriteToStream(stream);
Assert.IsTrue(DnsMessage.TryParse(stream.GetBuffer(), out outMessage));
}
Assert.AreEqual(0xFEED, outMessage.QueryIdentifier);
Assert.IsFalse(outMessage.QR);
Assert.AreEqual((byte) OpCode.QUERY, outMessage.Opcode);
Assert.IsFalse(outMessage.AA);
Assert.IsFalse(outMessage.TC);
Assert.IsTrue(outMessage.RD);
Assert.IsFalse(outMessage.RA);
Assert.IsFalse(outMessage.Zero);
Assert.IsFalse(outMessage.AuthenticatingData);
Assert.IsFalse(outMessage.CheckingDisabled);
Assert.AreEqual(0x0000, outMessage.RCode);
Assert.AreEqual(0x0001, outMessage.QuestionCount);
Assert.AreEqual(0x0002, outMessage.AnswerCount);
Assert.AreEqual(0x0000, outMessage.NameServerCount);
Assert.AreEqual(0x0000, outMessage.AdditionalCount);
// Question Checks
Assert.AreEqual(outMessage.QuestionCount, outMessage.Questions.Count());
// Q1
Assert.AreEqual("www.msn.com", outMessage.Questions[0].Name);
Assert.AreEqual(ResourceType.A, outMessage.Questions[0].Type);
Assert.AreEqual(ResourceClass.IN, outMessage.Questions[0].Class);
Assert.AreEqual(outMessage.AnswerCount, outMessage.Answers.Count());
Assert.AreEqual(outMessage.AnswerCount, outMessage.Answers.Count());
Assert.AreEqual("8.8.8.8", outMessage.Answers[0].Name);
Assert.AreEqual("8.8.8.9", outMessage.Answers[1].Name);
}
