我正在尝试为这个“异步”嵌入式卡的LED标志写一个网络接口。现有的软件名为“PlutoManager”,但它是在中国生产的,对于我们的老客户来说太难了。从wireshark数据包自定义TCP头/复制TCP头
该软件通过与以太网电缆与嵌入式卡(称为PSD100)进行交互来完成许多操作。
我看了一些文档,文档指出卡通过标准的TCP/IP协议进行通信。 (或类似的TCP/IP,搞不清东西)
我翻译了一些东西从中国的文件我得到阿霍德的,这就是我来了解该卡的协议:
(我不太了解TCP/IP,所以这种翻译可能很粗糙,请记住这些词可能是错误的词,这可能是我的问题的重要组成部分。)
因此,对于每个与卡(发送文件,握手,改变LED标志的亮度等)有两件事情必须发生:
- 的消息被发送给卡(请求分组)
- 从卡接收到的应答(应答包)
请求分组结构如下:(来自中国,和我的翻译很烂)
> 1. Header: 1 byte (16 bits) with a hex value of "0x02"
>2. Card Address(??): 2 bytes (32 bits)
>3. Packet Type: 2 bytes (32 bits)
>4. data: indeterminate length
>5. CRC Check: 2 bytes (32 bits)
>6. End of Text Character: 1 byte (16 bits) (value: "0x03" [I guess that's equal to ^c ?]
这是否看起来像正常的TCP/IP结构,不然我和定制包运走之前?
我想我可以使用Wireshark来嗅探PlutoManager握手时发送的数据包。我还在C#中编写了一些代码,试图与设备的端口建立连接。这是两个并排的。请注意,这只是转储的TCP数据包部分,wireshark输出的TCP部分是唯一不同的部分。
TCP SEGMENT CAPTURED FROM WIRESHARK HEX + ASCII DUMP (FROM MY C# CODE)
HEX
0000 d0 6b 7a 43 5e a3 79 62 67 78 dc bf 50 10 80 51 ASCII: .kzC^.ybgx..P..Q
0010 46 60 00 00 F`..
TCP SEGMENT CAPTURED FROM WIRESHARK HEX + ASCII DUMP (PLUTOMANAGER CODE)
HEX
0000 7a 42 d0 6a 34 17 04 36 5e a3 0b 1d 50 10 01 00 ASCII: zB.j4..6^...P...
0010 82 50 00 00
我算了一下,“哎,我可以只发送自定义负载到卡用的send()命令和复制什么PlutoManager代码做什么!”
我不知道这个中文软件是否使用一些特殊的TCP有效载荷来发送消息到标志,或者它是否使用标准协议。我不知道如何发现差异。我曾尝试使用Pcap.net发送自定义有效内容,但在继续沿着拉比方向走下去之前,似乎有必要这样做? 第二个Wireshark输出是TCP/IP协议中常见的东西吗?是否可以发送字符串“zB/^ T3mPP”(这是握手的十六进制转储输出)以便进行握手?
这是如何我现在有我的节目结构(基本上STR:
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
// State object for receiving data from remote device.
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 256;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousClient
{
// The port number for the remote device.
private const int port = 31298;
// ManualResetEvent instances signal completion.
private static ManualResetEvent connectDone =
new ManualResetEvent(false);
private static ManualResetEvent sendDone =
new ManualResetEvent(false);
private static ManualResetEvent receiveDone =
new ManualResetEvent(false);
// The response from the remote device.
private static String response = String.Empty;
private static void StartClient()
{
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
// The name of the
// remote device is "host.contoso.com".
//IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");
IPAddress ipAddress = IPAddress.Parse("192.168.0.59"); //ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket client = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Connect to the remote endpoint.
client.BeginConnect(remoteEP,
new AsyncCallback(ConnectCallback), client);
connectDone.WaitOne();
// Send test data to the remote device.
Send(client, "This is a test<EOF>");
sendDone.WaitOne();
// Receive the response from the remote device.
Receive(client);
receiveDone.WaitOne();
// Write the response to the console.
Console.WriteLine("Response received : {0}", response);
// Release the socket.
client.Shutdown(SocketShutdown.Both);
client.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete the connection.
client.EndConnect(ar);
Console.WriteLine("Socket connected to {0}",
client.RemoteEndPoint.ToString());
// Signal that the connection has been made.
connectDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Receive(Socket client)
{
try
{
// Create the state object.
StateObject state = new StateObject();
state.workSocket = client;
// Begin receiving the data from the remote device.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
// Retrieve the state object and the client socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.workSocket;
// Read data from the remote device.
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// Get the rest of the data.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
else
{
// All the data has arrived; put it in response.
if (state.sb.Length > 1)
{
response = state.sb.ToString();
}
// Signal that all bytes have been received.
receiveDone.Set();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Send(Socket client, String data)
{
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
client.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), client);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = client.EndSend(ar);
Console.WriteLine("Sent {0} bytes to server.", bytesSent);
// Signal that all bytes have been sent.
sendDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args)
{
StartClient();
return 0;
}
}
main()的运行命令StartClient(),其尝试连接,但最终输出错误消息:
System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it 192.168.0.59:31298
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at AsynchronousClient.ConnectCallback(IAsyncResult ar) in C:\Users\xxxxx\Desktop\SocketListenerTest\SocketListenerTest\SocketListenerTest\Program.cs:line 87
87号线: client.EndConnect(ar);
这让我觉得,我连接到正确的IP和正确的端口,但内置于.NET中的协议和此嵌入式设备使用的协议不同。
我有权访问一个中文文档(我会发布它,但它是在NDA之下)的一些规格的设备。如果我错过了一些东西,或者如果您需要更多信息,我会尽我所能。我试图提供我能够提供的最相关的信息,但这对我来说很陌生。
我想我可以简化问题到“如何修改Sockets.Connect()方法以使用自定义TCP协议?”但我认为最好是对我想要完成的事情给出一个更全面的概述,因为那可能不是我所需要做的。
感谢您抽出时间看一下这个问题。如果您有任何建议,甚至可以将我指向图书馆或书籍或某种阅读材料,我很乐意听到它。谢谢。
你确定它是正确的IP和端口吗?没有“自定义TCP协议”。您的规格显示的是数据包的**有效负载**。由于TCP是基于流的,因此使用wireshark进行嗅探比较困难(我更像是一个UDP人)。 TCP数据包被分段并在到达时按顺序放回。然而网络实施已经这样做了。 – jython234