DBus: Add ability to report probe requests

Some applications require knowing about probe requests to identify
devices. This can be the case in AP mode to see the devices before they
connect, or even in P2P mode when operating as a P2P device to identify
non-P2P peers (P2P peers are identified via PeerFound signals).

As there are typically a lot of probe requests, require that an
interested application subscribes to this signal so the bus isn't always
flooded with these notifications. The notifications in DBus are then
unicast only to that application.

A small test script is also included.

Signed-hostap: Johannes Berg <johannes.berg@intel.com>

wpa_supplicant/examples/dbus-listen-preq.py

@@ -0,0 +1,62 @@
+#!/usr/bin/python
+
+import dbus
+import sys
+import time
+import gobject
+from dbus.mainloop.glib import DBusGMainLoop
+
+WPAS_DBUS_SERVICE = "fi.w1.wpa_supplicant1"
+WPAS_DBUS_INTERFACE = "fi.w1.wpa_supplicant1"
+WPAS_DBUS_OPATH = "/fi/w1/wpa_supplicant1"
+WPAS_DBUS_INTERFACES_INTERFACE = "fi.w1.wpa_supplicant1.Interface"
+
+def usage():
+	print "Usage: %s <ifname>" % sys.argv[0]
+	print "Press Ctrl-C to stop"
+
+def ProbeRequest(args):
+	if 'addr' in args:
+		print '%.2x:%.2x:%.2x:%.2x:%.2x:%.2x' % tuple(args['addr']),
+	if 'dst' in args:
+		print '-> %.2x:%.2x:%.2x:%.2x:%.2x:%.2x' % tuple(args['dst']),
+	if 'bssid' in args:
+		print '(bssid %.2x:%.2x:%.2x:%.2x:%.2x:%.2x)' % tuple(args['dst']),
+	if 'signal' in args:
+		print 'signal:%d' % args['signal'],
+	if 'ies' in args:
+		print 'have IEs (%d bytes)' % len(args['ies']),
+        print ''
+
+if __name__ == "__main__":
+	global bus
+	global wpas_obj
+	global if_obj
+	global p2p_iface
+
+	dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
+
+	bus = dbus.SystemBus()
+	wpas_obj = bus.get_object(WPAS_DBUS_SERVICE, WPAS_DBUS_OPATH)
+
+	# Print list of i/f if no one is specified
+	if (len(sys.argv) < 2)  :
+		usage()
+		sys.exit(0)
+
+	wpas = dbus.Interface(wpas_obj, WPAS_DBUS_INTERFACE)
+
+	ifname = sys.argv[1]
+
+	path = wpas.GetInterface(ifname)
+
+	if_obj = bus.get_object(WPAS_DBUS_SERVICE, path)
+	iface = dbus.Interface(if_obj, WPAS_DBUS_INTERFACES_INTERFACE)
+
+	bus.add_signal_receiver(ProbeRequest,
+				dbus_interface=WPAS_DBUS_INTERFACES_INTERFACE,
+				signal_name="ProbeRequest")
+
+	iface.SubscribeProbeReq()
+
+	gobject.MainLoop().run()