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.NetworkToHostOrder16(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.getInstance().WriteNet(Logger.DebugLevel.Debug, globalListener.endPoint, endpoint, ProtocolType.Udp, data);
globalListener.udp.Send(data, data.Length, endpoint);
}
catch
{
Logger.getInstance().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)
{
try
{
Logger.getInstance().WriteNet(Logger.DebugLevel.Debug, net.endPoint, endpoint, ProtocolType.Udp, data);
net.udp.Send(data, data.Length, endpoint);
}
catch
{
Logger.getInstance().WriteLine(Logger.DebugLevel.Error, String.Format("Error: mDNS.scan(): Unable to send data to {0}!", endpoint.ToString()));
}
}
}
}
}
private byte[] buildQuery(string queryString, mDNSType queryType)
{
byte[] result;
string[] subDomains;
int querySize, i;
IdnMapping idn = new IdnMapping();
subDomains = idn.GetAscii(queryString).Split('.');
// compute size of byte needed
querySize = 0;
foreach (var d in subDomains)
{
querySize += 1 + Encoding.ASCII.GetBytes(d).Length;
}
querySize++; // NULL string termination;
querySize += 4; // type + questionClass;
result = new byte[querySize];
// generate query
i = 0;
foreach (var d in subDomains)
{
byte[] currentSubDomain;
result[i] = (byte)d.Length;
i++;
currentSubDomain = Encoding.ASCII.GetBytes(d);
currentSubDomain.CopyTo(result, i);
i += currentSubDomain.Length;
}
result[i++] = 0x00; // NULL string termination;
result[i] = (byte)((((UInt16)queryType) << 8) & 0xff);
result[i + 1] = (byte)(((UInt16)queryType) & 0xff);
i += 2;
result[i++] = (byte)((mDNSQuestionClass << 8) & 0xff); // mDNSQuestionClass
result[i++] = (byte)((mDNSQuestionClass) & 0xff);
return(result);
}
