Crate rl2tp

Expand description

A Rust implementation of the L2TP protocol. This crate provides the full set of protocol messages required to speak L2TP, together with some utility traits used to read and write them.

Examples

Read L2TP data from a buffer

use rl2tp::{Message, common::SliceReader};
let buffer = vec![
       0x13, 0x20, // Flags
       0x00, 0x14, // Length
       0x00, 0x02, // Tunnel ID
       0x00, 0x03, // Session ID
       0x00, 0x04, // Ns
       0x00, 0x05, // Nr
       // AVP Payload
       0x00, 0x08, // Flags and Length
       0x00, 0x00, // Vendor ID
       0x00, 0x00, // Attribute Type (Message Type)
       0x00, 0x01, // Type 1 (StartControlConnectionRequest)
];

let mut r = SliceReader::from(&buffer);
let msg = Message::try_read(&mut r).unwrap();

match msg {
    Message::Data(_) => (),
    Message::Control(_) => (),
}

Write an L2TP control message to a `Vec`

use rl2tp::{Message, common::VecWriter, avp::{AVP, types::MessageType}};

let mut w = VecWriter::new();
let msg = Message::<Vec<u8>>::Control(rl2tp::ControlMessage {
    length: 0,
    tunnel_id: 5,
    session_id: 0,
    ns: 0,
    nr: 0,
    avps: vec![
        AVP::MessageType(MessageType::StartControlConnectionConnected),
    ],
});
unsafe { msg.write(&mut w) };

Write an L2TP data message to a buffer


use rl2tp::{Message, common::VecWriter};
use core::borrow::Borrow;

let data = vec![0xde,0xad,0xbe,0xef];

let mut w = rl2tp::common::VecWriter::new();
let msg = rl2tp::Message::Data(rl2tp::DataMessage {
    is_prioritized: false,
    length: None,
    tunnel_id: 5,
    session_id: 0,
    ns_nr: None,
    offset: None,
    data: data.borrow(),
});
unsafe { msg.write(&mut w) };