dbus: Add an example python script for using the new dbus interface

This has example code for fetching and interface object and optionally
creating a new interface is one is not found. After that, a scan is
requested and the script continues to listed for signals from
wpa_supplicant and print information about scan results and state
changes.

wpa_supplicant/examples/wpas-dbus-new.py

@@ -0,0 +1,121 @@
+#!/usr/bin/python
+
+import dbus
+import sys, os
+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"
+WPAS_DBUS_INTERFACES_OPATH = "/fi/w1/wpa_supplicant1/Interfaces"
+WPAS_DBUS_BSS_INTERFACE = "fi.w1.wpa_supplicant1.Interface.BSS"
+
+def byte_array_to_string(s):
+	import urllib
+	r = ""    
+	for c in s:
+		if c >= 32 and c < 127:
+			r += "%c" % c
+		else:
+			r += urllib.quote(chr(c))
+	return r
+
+def list_interfaces(wpas_obj):
+	ifaces = wpas_obj.Interfaces
+	for i in ifaces:
+		print "%s" (i)
+
+def stateChanged(newState, oldState):
+	print "StateChanged(%s -> %s)" % (oldState, newState)
+
+def scanDone(success):
+	gobject.MainLoop().quit()
+	print "Scan done: success=%s" % success
+	
+	res = if_obj.Get(WPAS_DBUS_INTERFACES_INTERFACE, 'BSSs',
+			 dbus_interface=dbus.PROPERTIES_IFACE)
+
+	print "Scanned wireless networks:"
+	for opath in res:
+		print opath
+		net_obj = bus.get_object(WPAS_DBUS_SERVICE, opath)
+		net = dbus.Interface(net_obj, WPAS_DBUS_BSS_INTERFACE)
+		props = net_obj.Get(WPAS_DBUS_BSS_INTERFACE, 'Properties',
+				    dbus_interface=dbus.PROPERTIES_IFACE)
+		#print props
+
+		# Convert the byte-array for SSID and BSSID to printable strings
+		bssid = ""
+		for item in props['BSSID']:
+			bssid = bssid + ":%02x" % item
+		bssid = bssid[1:]
+		ssid = byte_array_to_string(props["SSID"])
+
+		wpa = "no"
+		if props.has_key("WPAIE"):
+			wpa = "yes"
+		wpa2 = "no"
+		if props.has_key("RSNIE"):
+			wpa2 = "yes"
+		freq = 0
+		if props.has_key("Frequency"):
+			freq = props["Frequency"]
+		caps = props["Capabilities"]
+		qual = props["Quality"]
+		level = props["Level"]
+		noise = props["Noise"]
+		maxrate = props["MaxRate"] / 1000000
+
+		print "  %s  ::  ssid='%s'  wpa=%s  wpa2=%s  quality=%d%%  rate=%d  freq=%d" % (bssid, ssid, wpa, wpa2, qual, maxrate, freq)
+
+def main():
+	dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
+	global bus
+	bus = dbus.SystemBus()
+	wpas_obj = bus.get_object(WPAS_DBUS_SERVICE, WPAS_DBUS_OPATH)
+	wpas = dbus.Interface(wpas_obj, WPAS_DBUS_INTERFACE)
+	bus.add_signal_receiver(scanDone,
+				dbus_interface=WPAS_DBUS_INTERFACES_INTERFACE,
+				signal_name="ScanDone")
+	bus.add_signal_receiver(stateChanged,
+				dbus_interface=WPAS_DBUS_INTERFACES_INTERFACE,
+				signal_name="StateChanged")
+
+	if len(sys.argv) != 2:
+		list_interfaces(wpas_obj)
+		os._exit(1)
+
+	ifname = sys.argv[1]
+
+	# See if wpa_supplicant already knows about this interface
+	path = None
+	try:
+		path = wpas.GetInterface(ifname)
+	except dbus.DBusException, exc:
+		if not str(exc).startswith("fi.w1.wpa_supplicant1.InterfaceUnknown:"):
+			raise exc
+		try:
+			path = wpas.CreateInterface({'Ifname': ifname, 'Driver': 'test'})
+			time.sleep(1)
+
+		except dbus.DBusException, exc:
+			if not str(exc).startswith("fi.w1.wpa_supplicant1.InterfaceExists:"):
+				raise exc
+
+	global if_obj
+	if_obj = bus.get_object(WPAS_DBUS_SERVICE, path)
+	global iface
+	iface = dbus.Interface(if_obj, WPAS_DBUS_INTERFACES_INTERFACE)
+	iface.Scan({'Type': 'active'})
+
+	gobject.MainLoop().run()
+
+	wpas.RemoveInterface(dbus.ObjectPath(path))
+
+if __name__ == "__main__":
+	main()
+