Low level implementation of UDP and IPv4 protocols in Rust using tun/tap devices. This only works on Linux. This is a learning project, not intended for any real world use.
Need to set capacity on the executable:
sudo setcap cap_net_admin+ep ./target/debug/udp-implementation
Add IP address to the tun device:
sudo ip addr add 192.168.0.1/24 dev tun
Bring up the tun device, allow it to send and receive packets:
sudo ip link set up dev tun
or this can all be done wit the script:
./run.sh
The address above can be changed to anything on the 192.168.0.1/24 subnet.
Test it by pinging: ping -I tun 192.168.0.2
Look at packets with tshark: tshark -i tun (or Wireshark)
Send UDP packet to tun device: echo "Hello, UDP server!" | nc -u 192.168.0.2 161
udp_implementation::new() -> UdpSocket
Creates a new UdpSocket.
udp_implementation::bind(&mut self, ip: Ipv4Addr, port: u16)
Binds the socket to the given address.
udp_implementation::new_with_ip(ip: Ipv4Addr, port: u16) -> UdpSocket
Creates a new UdpSocket and binds it to the given address.
udp_implementation::send_to(&mut self, ip: Ipv4Addr, port: u16, data: &[u8]) -> io::Result<usize>
Sends data to the given address.
udp_implementation::recv_any(&mut self) -> UdpPacket
Receives data from any address.
udp_implementation::recv_from(&mut self, ip: Ipv4Addr, port: u16) -> UdpPacket
Receives data from the given address.
udp_implementation::recv(&mut self) -> UdpPacket
Receives data from the binded address.
See example in main.rs for usage.