CODEWITHSUNDEEP
c#tcplistener
Xaphann
Xaphann

Reputation: 3677

TcpListener parser

I have a simple TcpListener and I want to parse the data it receives. Here is what I have and it works:

TcpListener listener = new TcpListener(localAddr, port);
var client = listener.AcceptTcpClient();
var buffer = new byte[10240];
var stream = client.GetStream();
var length = stream.Read(buffer, 0, buffer.Length);
var incomingMessage = Encoding.UTF8.GetString(buffer, 0, length);

results

Incoming message: POST /api/v1/myapi/ HTTP/1.1
Content-Type: application/json
ApiKey: dac38055e7914b1f8ca5de1683b58322
cache-control: no-cache
Postman-Token: 50da88e4-5c89-4368-a5eb-1574eb35b24a
User-Agent: PostmanRuntime/7.6.1
Accept: */*
Host: MyDNS:13000
accept-encoding: gzip, deflate
content-length: 590
Connection: keep-alive

AmazingDataFromBody

Is there anything that will parse this or do I have to write my own?

Upvotes: 1

Views: 1123

Answers (1)

Jorge Omar Medra
Jorge Omar Medra

Reputation: 988

As i can see, you want to handle an HTTP Request, so:

  1. Instead of TCPListener use HttpListener to handle HTTP Request and Response. Link: https://learn.microsoft.com/en-us/dotnet/api/system.net.httplistener?view=netframework-4.7.2
  2. Add the Prefix to HTTPLister with your URI http:localhost[:port]/api/v1/myapi/, using the host and port.
  3. Start the HttpListener.
  4. Use GetContext() to get the HttpListenerRequest object.
  5. With HttpListenerRequest you can get the Headers and body, check this link: https://learn.microsoft.com/en-us/dotnet/api/system.net.httplistenerrequest?view=netframework-4.7.2
  6. Use GetContext() to get the HttpListenerResponse object.

Using the sample of https://learn.microsoft.com/en-us/dotnet/api/system.net.httplistener?view=netframework-4.7.2 you can see:

    // This example requires the System and System.Net namespaces.
    public static void SimpleListenerExample(string[] prefixes)
    {
        // 1
        HttpListener listener = new HttpListener();
        // 2
        listener.Prefixes.Add("http:/localhost:8080//api/v1/myapi/");

        // 3
        listener.Start();
        Console.WriteLine("Listening...");

        //4
        HttpListenerContext context = listener.GetContext();
        HttpListenerRequest request = context.Request;

        //5
        HttpListenerResponse response = context.Response;

        //Building a response
        string responseString = "<HTML><BODY>My response</BODY></HTML>";
        //Take care of encoding
        byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);

        //6
        response.ContentLength64 = buffer.Length;
        //Get the stream to wite the response body
        System.IO.Stream output = response.OutputStream;
        output.Write(buffer,0,buffer.Length);
        // You must close the output stream.
        output.Close();
        listener.Stop();
    }

if you don't want to use HttpListener you can use these basic steps, using TCPListener and TCPClient but you must have knowledge about HTTP Protocol:

  1. Read the Header, line by line.
  2. Valid if there is Body, using the the content-length header.
  3. Read the body, according information of the size of content-length.

In my case, i prefer use HttpListener, which allows handle several aspect of HTTP, like certified.

Upvotes: 2

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