Пример #1
0
        /// <summary>
        /// Parse bytes for a CONNECT message
        /// </summary>
        /// <param name="fixedHeaderFirstByte">First fixed header byte</param>
        /// <param name="protocolVersion">Protocol Version</param>
        /// <param name="channel">Channel connected to the broker</param>
        /// <returns>CONNECT message instance</returns>
        public static MqttConnectMessage Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
        {
            byte[] buffer;
            int    index = 0;
            int    protNameUtf8Length;

            byte[] protNameUtf8;
            bool   isUsernameFlag;
            bool   isPasswordFlag;
            int    clientIdUtf8Length;

            byte[] clientIdUtf8;
            int    willTopicUtf8Length;

            byte[] willTopicUtf8;
            int    willMessageUtf8Length;

            byte[] willMessageUtf8;
            int    usernameUtf8Length;

            byte[] usernameUtf8;
            int    passwordUtf8Length;

            byte[]             passwordUtf8;
            MqttConnectMessage msg = new MqttConnectMessage();

            // get remaining length and allocate buffer
            int remainingLength = MqttMessage.DecodeRemainingLength(channel);

            buffer = new byte[remainingLength];

            // read bytes from socket...
            channel.Receive(buffer);

            // protocol name
            protNameUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
            protNameUtf8Length |= buffer[index++];
            protNameUtf8        = new byte[protNameUtf8Length];
            Array.Copy(buffer, index, protNameUtf8, 0, protNameUtf8Length);
            index           += protNameUtf8Length;
            msg.protocolName = new string(Encoding.UTF8.GetChars(protNameUtf8));

            // [v3.1.1] wrong protocol name
            if (!msg.protocolName.Equals(PROTOCOL_NAME_V3_1) && !msg.protocolName.Equals(PROTOCOL_NAME_V3_1_1))
            {
                throw new MqttClientException(MqttClientErrorCode.InvalidProtocolName);
            }

            // protocol version
            msg.protocolVersion = buffer[index];
            index += PROTOCOL_VERSION_SIZE;

            // connect flags
            // [v3.1.1] check lsb (reserved) must be 0
            if ((msg.protocolVersion == PROTOCOL_VERSION_V3_1_1) &&
                ((buffer[index] & RESERVED_FLAG_MASK) != 0x00))
            {
                throw new MqttClientException(MqttClientErrorCode.InvalidConnectFlags);
            }

            isUsernameFlag   = (buffer[index] & USERNAME_FLAG_MASK) != 0x00;
            isPasswordFlag   = (buffer[index] & PASSWORD_FLAG_MASK) != 0x00;
            msg.willRetain   = (buffer[index] & WILL_RETAIN_FLAG_MASK) != 0x00;
            msg.willQosLevel = (byte)((buffer[index] & WILL_QOS_FLAG_MASK) >> WILL_QOS_FLAG_OFFSET);
            msg.willFlag     = (buffer[index] & WILL_FLAG_MASK) != 0x00;
            msg.cleanSession = (buffer[index] & CLEAN_SESSION_FLAG_MASK) != 0x00;
            index           += CONNECT_FLAGS_SIZE;

            // keep alive timer
            msg.keepAlivePeriod  = (ushort)((buffer[index++] << 8) & 0xFF00);
            msg.keepAlivePeriod |= buffer[index++];

            // client identifier [v3.1.1] it may be zero bytes long (empty string)
            clientIdUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
            clientIdUtf8Length |= buffer[index++];
            clientIdUtf8        = new byte[clientIdUtf8Length];
            Array.Copy(buffer, index, clientIdUtf8, 0, clientIdUtf8Length);
            index       += clientIdUtf8Length;
            msg.clientId = new string(Encoding.UTF8.GetChars(clientIdUtf8));
            // [v3.1.1] if client identifier is zero bytes long, clean session must be true
            if ((msg.protocolVersion == PROTOCOL_VERSION_V3_1_1) && (clientIdUtf8Length == 0) && (!msg.cleanSession))
            {
                throw new MqttClientException(MqttClientErrorCode.InvalidClientId);
            }

            // will topic and will message
            if (msg.willFlag)
            {
                willTopicUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
                willTopicUtf8Length |= buffer[index++];
                willTopicUtf8        = new byte[willTopicUtf8Length];
                Array.Copy(buffer, index, willTopicUtf8, 0, willTopicUtf8Length);
                index        += willTopicUtf8Length;
                msg.willTopic = new string(Encoding.UTF8.GetChars(willTopicUtf8));

                willMessageUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
                willMessageUtf8Length |= buffer[index++];
                willMessageUtf8        = new byte[willMessageUtf8Length];
                Array.Copy(buffer, index, willMessageUtf8, 0, willMessageUtf8Length);
                index          += willMessageUtf8Length;
                msg.willMessage = new string(Encoding.UTF8.GetChars(willMessageUtf8));
            }

            // username
            if (isUsernameFlag)
            {
                usernameUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
                usernameUtf8Length |= buffer[index++];
                usernameUtf8        = new byte[usernameUtf8Length];
                Array.Copy(buffer, index, usernameUtf8, 0, usernameUtf8Length);
                index       += usernameUtf8Length;
                msg.username = new string(Encoding.UTF8.GetChars(usernameUtf8));
            }

            // password
            if (isPasswordFlag)
            {
                passwordUtf8Length  = ((buffer[index++] << 8) & 0xFF00);
                passwordUtf8Length |= buffer[index++];
                passwordUtf8        = new byte[passwordUtf8Length];
                Array.Copy(buffer, index, passwordUtf8, 0, passwordUtf8Length);
                index       += passwordUtf8Length;
                msg.password = new string(Encoding.UTF8.GetChars(passwordUtf8));
            }

            return(msg);
        }
Пример #2
0
 /// <summary>
 /// Initializes a new instance of the <see cref="MqttConnectEventArgs"/> class.
 /// </summary>
 /// <param name="msg">CONNECT message received from client</param>
 public MqttConnectEventArgs(MqttConnectMessage msg)
 {
     this.Message = msg;
 }