RServer

A library/app for intercepting/sniffing TCP requests, modifying headers and responses.

Example

How to use the RServer to intercept/sniff TCP requests.

Let us consider that we want to run RServer at localhost address "127.0.0.1" and port 80.

Please set the browser/system proxy as host 127.0.0.1 aand port 80 to use Rserver.

use rserver;

fn main() {
    let (server_host, server_port) = ("127.0.0.1", 80);
    rserver::start_server(server_host, server_port);
}

How to read the stream data and return stream data & its length.

/// Read the stream data and return stream data & its length
fn read_stream(stream: &mut TcpStream) -> (Vec<u8>, usize) {
    let buffer_size = 512;
    let mut request_buffer = vec![];
    // let us loop & try to read the whole request data
    let mut request_len = 0usize;
    loop {
        let mut buffer = vec![0; buffer_size];
        match stream.read(&mut buffer) {
            Ok(n) => {
               
                if n == 0 {
                    break;
                } else {
                    request_len += n;

                    // we need not read more data in case we have read less data than buffer size
                    if n < buffer_size {
                        // let us only append the data how much we have read rather thann complete existing buffer data
                        // as n is less than buffer size
                        request_buffer.append(&mut buffer[..n].to_vec()); // convert slice into vec
                        break;
                    } else {
                        // append complete buffer vec data into request_buffer vec as n == buffer_size
                        request_buffer.append(&mut buffer);
                    }
                }
            }
            Err(e) => {
                println!("Error in reading stream data: {:?}", e);
                break;
            }
        }
    }

    (request_buffer, request_len)
}

Note : Currently : Connection to online hosts are working fine with GET requests only. CONNECT requests respose reading has some issue that needs to be fixed.

To-Do

• Fix CONNECT Method Response Reading
• Modifying/replacing Request Headers
• Modifying/replacing Reponse Headers