cerbero-lib 0.1.0

Kerberos protocol attacker library
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use crate::communication::{KrbChannel, TransportProtocol};
use std::{
	io,
	net::{IpAddr, SocketAddr, UdpSocket},
};

/// Send Kerberos messages over UDP
#[derive(Debug)]
pub struct UdpChannel
{
	dst_addr: SocketAddr,
}

impl UdpChannel
{
	pub fn new(dst_addr: SocketAddr) -> Self
	{
		Self { dst_addr }
	}
}

impl KrbChannel for UdpChannel
{
	fn send_recv(&self, raw: &[u8]) -> io::Result<Vec<u8>>
	{
		send_recv_udp(&self.dst_addr, raw)
	}

	fn protocol(&self) -> TransportProtocol
	{
		TransportProtocol::UDP
	}

	fn ip(&self) -> IpAddr
	{
		self.dst_addr.ip()
	}
}

pub fn send_recv_udp(dst_addr: &SocketAddr, raw_request: &[u8]) -> io::Result<Vec<u8>>
{
	let udp_socket = UdpSocket::bind("0.0.0.0:0")?;
	udp_socket.connect(dst_addr)?;

	udp_socket.send(raw_request)?;

	let data_length = calculate_response_size(&udp_socket)?;

	let mut raw_response = vec![0; data_length as usize];
	udp_socket.recv(&mut raw_response)?;

	Ok(raw_response)
}

fn calculate_response_size(udp_socket: &UdpSocket) -> io::Result<usize>
{
	let mut raw_response = vec![0; 2048];
	let mut data_length = udp_socket.peek(&mut raw_response)?;
	while data_length == raw_response.len()
	{
		raw_response.append(&mut raw_response.clone());
		data_length = udp_socket.peek(&mut raw_response)?;
	}
	Ok(data_length)
}

#[cfg(test)]
mod tests
{
	use super::*;
	use std::net::*;

	#[should_panic(expected = "NetworkError")]
	#[test]
	fn test_request_networks_error()
	{
		let requester = UdpChannel::new(SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 88));
		requester.send_recv(&[]).unwrap();
	}
}