public void Advance_should_move_index_to_given_position(int length, int expectedIndexValue)
{
// Arrange.
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
// Act.
reader.Advance(length);
reader.Advance(length);
// Assert.
Assert.AreEqual(expectedIndexValue, reader.Index);
}
public void DatagramReader_IndexBounds()
{
var bytes = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7 };
var reader = new DnsDatagramReader(new ArraySegment <byte>(bytes, 2, 4));
Assert.True(reader.DataAvailable);
reader.Advance(4);
Assert.False(reader.DataAvailable);
Action act = () => reader.Advance(1);
var ex = Assert.Throws <DnsResponseParseException>(act);
Assert.Equal(4, ex.Index);
Assert.Equal(1, ex.ReadLength);
}
public void DatagramReader_LabelTest_DnsName_LengthOutOfBounds()
{
var data = ReferenceBitData.Concat(new byte[] { 192, 23 });
var reader = new DnsDatagramReader(new ArraySegment <byte>(data.ToArray()));
reader.Advance(36);
DnsString name = reader.ReadDnsName();
Assert.Equal("eeeee.dd.c.aa.com.", name.Value);
}
public void ReadUInt16NetworkOrder_should_throw_IndexOutOfRangeException_when_index_exceeds_data_count()
{
// Arrange.
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionQuery);
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
reader.Advance(100);
// Act.
Assert.Throws <IndexOutOfRangeException>(() => reader.ReadUInt16NetworkOrder(sampleData), "Cannot read more data.");
}
public void ReadIPAddress_should_throw_IndexOutOfRangeException_exception_when_less_than_4_bytes_are_present()
{
// Arrange.
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionQuery);
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
// advance the index to IP Address position + 1 to make it throw exception.
reader.Advance(43);
// Act => Assert.
Assert.Throws <IndexOutOfRangeException>(() => reader.ReadIPAddress(sampleData),
"Error while reading IPv4 address, expected 4 bytes. Index was outside the bounds of the array.");
}
public void ReadUInt16NetworkOrder_should_return_AnswerCount_of_6_from_data_starting_at_Index_0()
{
// Arrange.
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionQuery);
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
reader.Advance(6);
// Act.
ushort answerCout = reader.ReadUInt16NetworkOrder(sampleData);
// Assert.
Assert.AreEqual(5, answerCout);
}
public void ReadUInt32NetworkOrder_should_return_TTL_value_in_int32()
{
// Arrange.
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionAndAnswerQuery);
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
// advance the index to Time To Live position.
reader.Advance(37);
// Act.
uint timeToLive = reader.ReadUInt32NetworkOrder(sampleData);
// Assert.
Assert.AreEqual(2585, timeToLive);
}
public void ReadIPAddress_should_return_ipAddress()
{
// Arrange.
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionAndAnswerQuery);
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
// advance the index to IP Address position.
reader.Advance(43);
// Act.
IPAddress ipAddress = reader.ReadIPAddress(sampleData);
// Assert.
Assert.AreEqual("40.76.4.15", ipAddress.ToString());
}
public void ReadQuestionQueryString_should_return_queryString_successfully()
{
// Arrange.
const string query = "microsoft.com";
const string queryDot = query + ".";
ArraySegment <byte> sampleData = GetSampleData(ResponseDataSampleFile.QuestionQuery);
mockDnsString.Setup(m => m.FromResponseQueryString(queryDot)).Returns(new DnsString(query, queryDot));
IDnsDatagramReader reader = new DnsDatagramReader(mockDnsString.Object);
// move the index to 12th byte where the query starts in the response data.
reader.Advance(12);
// Act.
IDnsString dnsString = reader.ReadQuestionQueryString(sampleData);
// Assert.
Assert.AreEqual(dnsString.Original, query);
Assert.AreEqual(dnsString.Value, queryDot);
}