Java library for interfacing with TUN/TAP devices.
Linux provides out of the box support for TUN and TAP devices. All you have to do is to provide desired device name.
On Windows we can currently create TAP devices using OpenVPNs virtual network adapter (Tap Windows Adapter V9).
Provisioning of virtual network adapter is out of scope of this library. Network adapter has to be already created beforehand.
On macOS there is native support of TUN devices (utun).
However, for TAP devices, a system/kernel extension has to be installed and loaded in order to use it.
This provides us with /dev/tap0 up to /dev/tap15 (total of 16 TAP devices).
import one.papachi.tuntap4j.TunDevice;
import java.io.IOException;
import java.nio.ByteBuffer;
class App {
public static void main(String[] args) throws IOException {
TunDevice tunDevice = new TunDevice("tun0");
tunDevice.open();
if (!tunDevice.isOpen())
return;
tunDevice.setIPAddress("10.0.0.1", "255.0.0.0");
ByteBuffer buffer = ByteBuffer.allocate(1500);
while (true) {
tunDevice.read(buffer);
buffer.flip();
// TODO do something with the pakcet
}
}
}import one.papachi.tuntap4j.TapDeviceDevice;
import java.io.IOException;
class App {
public static void main(String[] args) throws IOException {
TapDevice tapDevice = new TapDevice("tap0");
tapDevice.open();
if (!tapDevice.isOpen())
return;
tapDevice.setIPAddress("10.0.0.1", "255.0.0.0");
ByteBuffer buffer = ByteBuffer.allocate(1514);
while (true) {
tapDevice.read(buffer);
buffer.flip();
// TODO do something with the frame
}
}
}