/// <summary>
/// TCP协议打包数据
/// </summary>
/// <param name="dataContent">待打包的数据</param>
/// <param name="functionalNum">功能码</param>
/// <returns>打包后的数据</returns>
static byte[] EnpackTCP(byte[] dataContent, TCPProtocolKey functionalNum)
{
List <byte> sendBytes = new List <byte>(8 + dataContent.Length);
sendBytes.Add(header1);
sendBytes.Add(header2);
sendBytes.Add(remoteDeviceIndex.HasValue ? remoteDeviceIndex.Value : byte.MinValue);
sendBytes.Add((byte)functionalNum);
sendBytes.AddRange(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataContent.Length)));
sendBytes.AddRange(dataContent);
return(sendBytes.ToArray());
}
/// <summary>
/// 处理TCP接收的数据
/// </summary>
/// <param name="datas">所收数据</param>
static void DealWithTcpTransferRecieveDatas(byte[] datas)
{
int dataLength = 0;
if (datas.Length > 8)
{
dataLength = Convert.ToInt32(IPAddress.NetworkToHostOrder(
BitConverter.ToInt32(datas, (byte)TCPProtocol.DataLength)));
if (dataLength != datas.Length - 8)
{
return; // 数据段长度不匹配
}
}
else
{
if (datas.Length != 4)
{
return; // 总长度不匹配
}
}
if (datas[(byte)TCPProtocol.Header1] != header1 ||
datas[(byte)TCPProtocol.Header2] != header2)
{
return; // 协议头不匹配
}
byte deviceIndex = datas[(byte)TCPProtocol.DeviceID]; // 设备号
TCPProtocolKey protocolKey = (TCPProtocolKey)datas[(byte)TCPProtocol.ProtocolKey]; // 标志位
if (Object.Equals(remoteDeviceIndex, null) && !protocolKey.Equals(TCPProtocolKey.RSAPublicKey))
{
return; // 尚未获得设备号 不允许接收RSA公钥以外的消息
}
switch (protocolKey)
{
case TCPProtocolKey.RSAPublicKey:
if (dataLength != (int)SecurityKeyLength.RSAKeyLength)
{
return; // RSA公钥长度不匹配
}
remoteDeviceIndex = deviceIndex; // RSA传送时发送设备号
remoteDevicePublicKey = Encoding.UTF8.GetString(datas, (byte)TCPProtocol.DataContent, dataLength);
// 发送AES公钥
SendAESKey();
Logger.HistoryPrinting(Logger.Level.INFO, MethodBase.GetCurrentMethod().DeclaringType.FullName, "RSAKey saved, AES sent, TCP can be used to transfer.");
break;
case TCPProtocolKey.NormalData:
if (remoteDeviceIndex != deviceIndex)
{
return; // 设备号不匹配
}
// 入队等待Pipe发送
PushNormalData(datas.Skip((byte)TCPProtocol.DataContent).ToArray());
Logger.HistoryPrinting(Logger.Level.INFO, MethodBase.GetCurrentMethod().DeclaringType.FullName, "Data enqueue for pipe.");
break;
case TCPProtocolKey.PingSignal:
if (remoteDeviceIndex != deviceIndex)
{
return; // 设备号不匹配
}
tcpBeatClocker.Stop(); // 重开计时器
tcpBeatClocker.Start();
break;
case TCPProtocolKey.EndRemoteControl:
if (remoteDeviceIndex != deviceIndex)
{
return; // 设备号不匹配
}
NormalEndTcpOperation(); // 收到指令进行一般TCP中断操作
Logger.HistoryPrinting(Logger.Level.INFO, MethodBase.GetCurrentMethod().DeclaringType.FullName, "TCP transfer is stopped.");
break;
case TCPProtocolKey.EndBothControl:
if (remoteDeviceIndex != deviceIndex)
{
return; // 设备号不匹配
}
EndTcpOperationWithStopPipeTransfer(); // 收到指令中断TCP操作，同时停止Pipe传输
Logger.HistoryPrinting(Logger.Level.INFO, MethodBase.GetCurrentMethod().DeclaringType.FullName, "TCP transfer is stopped and cut down pipe transfer at the same time.");
break;
case TCPProtocolKey.AESCommonKeyAndIV:
break;
default:
Logger.HistoryPrinting(Logger.Level.INFO, MethodBase.GetCurrentMethod().DeclaringType.FullName, "No such control command.");
break;
}
}
