mac80211: always use wpa_supplicant for client connections (patch by Stijn Tintel)

Since client mode in mac80211is unreliable without using wpa_supplicant,
it would be better to enable wpa_supplicant by default.

With this patch, wpa_supplicant will always be used for mac80211-based
drivers in client mode. This will break client mode for images that
don't include wpa_supplicant or wpad, so maybe I need to add a check
somewhere to see if wpa_supplicant is available, and show the user a
warning if he tries client mode without wpa_supplicant. Suggestions on
where to add this check are welcome.

Tested with ath5k in client mode on open and wpa2-psk network, and
tested on my ath9k based AP as well to make sure it doesn't break AP mode.

SVN-Revision: 19718

package/hostapd/files/wpa_supplicant.sh

@@ -6,7 +6,10 @@ wpa_supplicant_setup_vif() {
 	# wpa_supplicant should use wext for mac80211 cards
 	[ "$driver" = "mac80211" ] && driver='wext'
 
-	# make sure we have the psk
+	# make sure we have the encryption type and the psk
+	[ -n "$enc" ] || {
+		config_get enc "$vif" encryption
+	}
 	[ -n "$key" ] || {
 		config_get key "$vif" key
 	}