nixpkgs/nixos/tests/qemu-vm-restrictnetwork.nix

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import ./make-test-python.nix ({
name = "qemu-vm-restrictnetwork";
nodes = {
unrestricted = { config, pkgs, ... }: {
virtualisation.restrictNetwork = false;
};
restricted = { config, pkgs, ... }: {
virtualisation.restrictNetwork = true;
};
};
testScript = ''
import os
if os.fork() == 0:
# Start some HTTP server on the qemu host to test guest isolation.
from http.server import HTTPServer, BaseHTTPRequestHandler
HTTPServer(("", 8000), BaseHTTPRequestHandler).serve_forever()
else:
start_all()
unrestricted.systemctl("start network-online.target")
restricted.systemctl("start network-online.target")
unrestricted.wait_for_unit("network-online.target")
restricted.wait_for_unit("network-online.target")
# Guests should be able to reach each other on the same VLAN.
unrestricted.succeed("ping -c1 restricted")
restricted.succeed("ping -c1 unrestricted")
# Only the unrestricted guest should be able to reach host services.
# 10.0.2.2 is the gateway mapping to the host's loopback interface.
unrestricted.succeed("curl -s http://10.0.2.2:8000")
restricted.fail("curl -s http://10.0.2.2:8000")
'';
})