loco-protocol - Loco protocol implementation

Open source Loco protocol implementation made with rust

Specification

Command

| name | size | |-----------|-------------------| | header | (Header) 22 bytes | | data | header.data_size |

Header

| name | size | |-----------|----------| | id | 4 bytes | | status | 2 bytes | | name | 11 bytes | | datatype | 1 bytes | | datasize | 4 bytes |

Secure data

| name | size | |----------------|--------------------| | header | (Header) 20 bytes | | encrypted data | header.size - 16 |

Header

| name | size | |-----------|----------| | iv | 16 bytes | | size | 4 bytes |

Handshake

| name | size | |------------------|------------| | key size | 4 bytes | | keyencrypttype | 4 bytes | | encrypt_type | 4 bytes | | key | 256 bytes |

Note: current implementation only supports RSA-AES

Example

```rust use std::{net::{TcpListener, TcpStream}, thread, io}; use openssl::rsa::Rsa; use loco_protocol::{command::{Command, Error, Header, processor::CommandProcessor}, io::SecureClientStream, io::SecureServerStream, secure::CryptoStore};

fn main() { let key = Rsa::generate(2048).expect("Cannot generate rsa key pairs.");

let socket = TcpListener::bind("127.0.0.1:5022").expect("Cannot bind tcp server");
socket.set_nonblocking(true).expect("Cannot set socket to unblocked mode");

let tcp = TcpStream::connect("127.0.0.1:5022").expect("Cannot connect tcp stream");
tcp.set_nonblocking(true).expect("Cannot set client stream to unblocked mode");

let mut client = CommandProcessor::new(
    SecureClientStream::new(
        CryptoStore::new().unwrap(),
        key.clone(),
        tcp
    )
);

let command = Command {
    header: Header {
        id: 0,
        status: 0,
        name: [72_u8, 101, 108, 108, 111, 0, 0, 0, 0, 0, 0],
        data_type: 0,
        data_size: 5
    },

    data: "Hello".as_bytes().into(),
};

client.write_command(command.clone()).expect("Failed to send command");
println!("CLIENT -> {:?}", command.clone());

loop {
    match socket.accept() {

        Ok(connection) => {
            let key = key.clone();

            thread::spawn(move || {
                let mut server = CommandProcessor::new(
                    SecureServerStream::new(
                        CryptoStore::new().unwrap(),
                        key,
                        connection.0
                    )
                );

                println!("Connected from {}", connection.1);
                loop {
                    match server.read_command() {

                        Ok(readed) => {
                            if readed.is_some() {
                                let received = readed.unwrap();
                                println!("SERVER <- {:?}", received.clone());

                                server.write_command(received.clone()).expect("Command failed to write");
                                println!("SERVER -> {:?}", received.clone());
                                break;
                            }
                        }

                        Err(err) => panic!(format!("{}", err))
                    }
                }
            });
        }

        Err(err) if err.kind() == io::ErrorKind::WouldBlock => {  }

        Err(err) => panic!(format!("{}", err))
    }

    match client.read_command() {

        Ok(readed) => {
            match readed {

                Some(received) => {
                    println!("CLIENT <- {:?}", received);
                    return;
                }

                None => {}
            }
        }

        Err(err) => {
            match err {
                Error::Io(io_err) if io_err.kind() == io::ErrorKind::WouldBlock => {}

                _ => panic!(format!("{}", err))
            }
        }
    }
}

} ```

License

``` MIT License

Copyright (c) 2020 storycraft

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ```