public void DnsRecordFactory_MBRecord()
{
var name = DnsString.Parse("Müsli.de");
using (var pool = new PooledBytes(DnsDatagramWriter.BufferSize))
{
var writer = new DnsDatagramWriter(new ArraySegment <byte>(pool.Buffer));
writer.WriteHostName(name.Value);
var factory = GetFactory(
writer.Data.ToArray(),
out var reader);
var info = new ResourceRecord(
DnsString.Parse("Müsli.de"),
MbRecord.ResourceRecordType,
QueryClass.In,
0,
writer.Data.Count);
var result = factory.GetRecord(
info,
reader) as MbRecord ?? throw new Exception();
Assert.Equal(
result.MadName,
name);
Assert.Equal(
"müsli.de.",
result.MadName.Original);
}
}
public DnsResponseMessage Resolve(IPEndPoint server, DnsRequestMessage dnsRequest)
{
using (communicator)
{
IUdpAdapter clientSocket = communicator.Client;
int timeoutInMillis = 5000;
clientSocket.ReceiveTimeout = timeoutInMillis;
clientSocket.SendTimeout = timeoutInMillis;
//
// write the dns query request data on in bytes to send to the DNS server.
//
using (IDnsDatagramWriter writer = new DnsDatagramWriter())
{
ConstructRequestData(dnsRequest, writer);
clientSocket.SendTo(writer.Data.Array, 0, writer.Data.Count, SocketFlags.None, server);
}
//
// Read the dns query response from the DNS server.
//
using (PooledBytes memory = new PooledBytes(ReadSize))
{
int received = clientSocket.Receive(memory.Buffer, 0, ReadSize, SocketFlags.None);
DnsResponseMessage response = messageProcessor.ProcessResponse(memory.BufferSegment);
if (dnsRequest.Header.Identifier != response.Header.Identifier)
{
throw new DnsResponseException("Header id mismatch.");
}
return(response);
}
}
}
public void DnsRecordFactory_PTRRecord()
{
var name = DnsString.Parse("result.example.com");
using (var pool = new PooledBytes(DnsDatagramWriter.BufferSize))
{
var writer = new DnsDatagramWriter(new ArraySegment <byte>(pool.Buffer));
writer.WriteHostName(name.Value);
var factory = GetFactory(
writer.Data.ToArray(),
out var reader);
var info = new ResourceRecord(
DnsString.Parse("query.example.com"),
PtrRecord.ResourceRecordType,
QueryClass.In,
0,
writer.Data.Count);
var result = factory.GetRecord(
info,
reader) as PtrRecord ?? throw new Exception();
Assert.Equal(
result.PtrDomainName,
name);
}
}
public void DnsRecordFactory_SRVRecord()
{
var name = DnsString.Parse("result.example.com");
using (var pool = new PooledBytes(DnsDatagramWriter.BufferSize))
{
var writer = new DnsDatagramWriter(new ArraySegment <byte>(pool.Buffer));
writer.WriteBytes(
new byte[] { 0, 1, 1, 0, 2, 3 },
6);
writer.WriteHostName(name.Value);
var factory = GetFactory(
writer.Data.ToArray(),
out var reader);
var info = new ResourceRecord(
DnsString.Parse("query.example.com"),
SrvRecord.ResourceRecordType,
QueryClass.In,
0,
writer.Data.Count);
var result = factory.GetRecord(
info,
reader) as SrvRecord ?? throw new Exception();
Assert.Equal(
result.Target,
name);
Assert.True(result.Priority == 1);
Assert.True(result.Weight == 256);
Assert.True(result.Port == 515);
}
}
private static byte[] GetResponseBytes(IDnsQueryResponse message, byte[] answerData)
{
using (var pool = new PooledBytes(DnsDatagramWriter.BufferSize))
{
var writer = new DnsDatagramWriter(new ArraySegment <byte>(pool.Buffer));
writer.WriteUInt16NetworkOrder((ushort)message.Header.Id);
writer.WriteUInt16NetworkOrder((ushort)message.Header.HeaderFlags);
// lets iterate answers only, makes it easier
//writer.WriteUInt16Network((ushort)message.Header.QuestionCount);
writer.WriteUInt16NetworkOrder(0);
writer.WriteUInt16NetworkOrder(1);
//writer.WriteUInt16Network((ushort)message.Header.NameServerCount);
writer.WriteUInt16NetworkOrder(0);
//writer.WriteUInt16Network((ushort)message.Header.AdditionalCount);
writer.WriteUInt16NetworkOrder(0);
var answer = message.Answers.First();
writer.WriteHostName(answer.DomainName.Value);
writer.WriteUInt16NetworkOrder(answer.RecordType.Value);
writer.WriteUInt16NetworkOrder((ushort)answer.RecordClass);
writer.WriteUInt32NetworkOrder((uint)answer.TimeToLive);
writer.WriteUInt16NetworkOrder((ushort)answerData.Length);
//writer.Extend(answerData.Length); // the following data->length
writer.WriteBytes(answerData, answerData.Length);
return(writer.Data.ToArray());
}
}
public void BufferSegmentTest()
{
// Arrange.
int count = 10;
PooledBytes pool = new PooledBytes(count);
// Act.
ArraySegment <byte> segmentedArray = pool.BufferSegment;
// Act.
Assert.AreEqual(count, segmentedArray.Count);
}
public ArraySegment <byte> BufferedWrite()
{
using (var bytes = new PooledBytes(ShortTestValueByteLength * Ops + Ops))
using (var writer = new DnsDatagramWriter(bytes.BufferSegment))
{
for (var i = 0; i < Ops; i++)
{
writer.WriteHostName(ShortTestValue);
}
return(writer.Data);
}
}
public ArraySegment <byte> BufferedWriteInt()
{
using (var bytes = new PooledBytes(4 * Ops))
using (var writer = new DnsDatagramWriter(bytes.BufferSegment))
{
for (var i = 0; i < 1000; i++)
{
writer.WriteInt32NetworkOrder(i);
}
return(writer.Data);
}
}
public void PooledByte_SimpleRent()
{
using (var b = new PooledBytes(10))
{
for (byte i = 0; i < 10; i++)
{
b.Buffer[i] = i;
}
Assert.Equal(10, b.BufferSegment.Count);
Assert.True(b.Buffer.Length > 10);
Assert.Equal(9, b.Buffer[9]);
}
}
public void BufferTest()
{
// Arrange.
PooledBytes pool = new PooledBytes(3);
// Act.
byte[] buffer = pool.Buffer;
// Assert.
Assert.IsNotNull(buffer);
Assert.AreEqual(16, buffer.Length);
}
public void TestDispose()
{
// Arrange.
PooledBytes pool = new PooledBytes(10);
// act.
pool.Dispose();
// assert.
Assert.Throws <ObjectDisposedException>(() =>
{
ArraySegment <byte> buffer = pool.BufferSegment;
});
}
public void PooledByte_Extend()
{
using (var b = new PooledBytes(10))
{
for (byte i = 0; i < 10; i++)
{
b.Buffer[i] = i;
}
Assert.Equal(10, b.BufferSegment.Count);
b.Extend(100);
b.Buffer[109] = 42;
Assert.Equal(110, b.BufferSegment.Count);
Assert.True(b.Buffer.Length > 110);
Assert.Equal(1, b.Buffer[1]);
Assert.Equal(9, b.Buffer[9]);
Assert.Equal(0, b.Buffer[10]);
Assert.Equal(42, b.Buffer[109]);
}
}