Ejemplo n.º 1
0
        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()));
                        }
                    }
                }
            }
        }
Ejemplo n.º 2
0
        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);
        }