GUPnP sample (WAN IP connection)

This program listens for UPnP WANIPConnection services and prints the external IP address reported by your router’s IGD. Adapted from the archived GNOME Wiki page Projects/Vala/GUPnP_sample.

using GUPnP;

void service_available_cb (ServiceProxy sp) {
    string value = "";
    sp.send_action ("GetExternalIPAddress", null, "NewExternalIPAddress", typeof (string), out value);
    print ("External IP is %s\n".printf (value));
}

int main (string[] args) {
    var ctx = new Context (null, null, 0);
    var cp = new ControlPoint (ctx, "urn:schemas-upnp-org:service:WANIPConnection:1");
    cp.service_proxy_available.connect (service_available_cb);
    cp.set_active (true);

    var loop = new GLib.MainLoop ();
    loop.run ();

    return 0;
}

Compile and run

valac --pkg gupnp-1.0 gupnp-demo.vala
./gupnp-demo

You need a network where UPnP IGD is enabled; many restrictive networks block the discovery traffic, in which case the callback may never fire.

Some routers expose WANPPPConnection instead of WANIPConnection; adjust the service URN string to match your device if needed.