public void scan(string queryString, mDNSType queryType)
{
byte[] data;
byte[] query;
mDNSHeader header;
byte[] headerBytes;
IPEndPoint endpoint;
header = new mDNSHeader()
{
transactionID = 0, flags = 0, questions = NetworkUtils.ntohs(1), answerRRs = 0, authorityRRs = 0, additionalRRs = 0
};
query = buildQuery(queryString, queryType);
headerBytes = header.GetBytes();
data = new byte[headerBytes.Length + query.Length];
headerBytes.CopyTo(data, 0);
query.CopyTo(data, headerBytes.Length);
endpoint = new IPEndPoint(IPAddress.Parse(multicastIP), port);
if (globalListener.inUse)
{
try
{
Logger.WriteLine(Logger.DebugLevel.Info, String.Format("{0} -> {1}", globalListener.endPoint.ToString(), endpoint.ToString()));
globalListener.udp.Send(data, data.Length, endpoint);
}
catch
{
Logger.WriteLine(Logger.DebugLevel.Error, String.Format("Error: mDNS.scan(): Unable to send data to {0}!", endpoint.ToString()));
}
}
if (interfacesListerner != null)
{
foreach (networkBundle net in interfacesListerner)
{
if (net.inUse)
{
Logger.WriteLine(Logger.DebugLevel.Info, String.Format("{0} -> {1}", net.endPoint.ToString(), endpoint.ToString()));
try
{
net.udp.Send(data, data.Length, endpoint);
}
catch
{
Logger.WriteLine(Logger.DebugLevel.Error, String.Format("Error: mDNS.scan(): Unable to send data to {0}!", endpoint.ToString()));
}
}
}
}
}
public override void reciever(IPEndPoint from, byte[] data)
{
mDNSHeader header;
int headerSize;
int expectedQueries, expectedAnwers;
int position;
headerSize = typeof(mDNSHeader).StructLayoutAttribute.Size;
if (data.Length <= headerSize)
{
Logger.WriteLine(Logger.DebugLevel.Warn, "Warning: mDNS.reciever(): invalid packet size.");
Logger.WriteData(Logger.DebugLevel.Warn, data);
return;
}
header = data.GetStruct <mDNSHeader>();
expectedQueries = NetworkUtils.ntohs(header.questions);
expectedAnwers = NetworkUtils.ntohs(header.authorityRRs) + NetworkUtils.ntohs(header.answerRRs) + NetworkUtils.ntohs(header.additionalRRs);
if (expectedAnwers > 0)
{
position = headerSize;
try
{
readQueries(data, ref position, expectedQueries);
readAnswers(data, ref position, expectedAnwers);
}
catch (OverflowException ex)
{
Logger.WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: mDNS.reciever(): packet parsing overflow at position 0x{0:X}!", position));
Logger.WriteLine(Logger.DebugLevel.Warn, ex.ToString());
Logger.WriteData(Logger.DebugLevel.Warn, data);
}
}
}
