hostapd: add support for WPS pushbutton station

similar to hostapd, also add a ubus interface for wpa_supplicant
which will allow handling WPS push-button just as it works for hostapd.
In order to have wpa_supplicant running without any network
configuration (so you can use it to retrieve credentials via WPS),
configure wifi-iface in /etc/config/wireless:

  config wifi-iface 'default_radio0'
      option device 'radio0'
      option network 'wwan'
      option mode 'sta'
      option encryption 'wps'

This section will automatically be edited if credentials have
successfully been acquired via WPS.

Size difference (mips_24kc): roughly +4kb for the 'full' variants of
wpa_supplicant and wpad which do support WPS.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 49 insertions, 4 deletions

diff --git a/package/network/services/hostapd/files/wps-hotplug.sh b/package/network/services/hostapd/files/wps-hotplug.sh
index 24af80e55b..ddfd021195 100644
--- a/package/network/services/hostapd/files/wps-hotplug.sh
+++ b/package/network/services/hostapd/files/wps-hotplug.sh
@@ -1,11 +1,56 @@
 #!/bin/sh
 
+wps_catch_credentials() {
+	local iface ifaces ifc ifname ssid encryption key radio radios
+	local found=0
+
+	. /usr/share/libubox/jshn.sh
+	ubus -S -t 30 listen wps_credentials | while read creds; do
+		json_init
+		json_load "$creds"
+		json_select wps_credentials || continue
+		json_get_vars ifname ssid key encryption
+		local ifcname="$ifname"
+		json_init
+		json_load "$(ubus -S call network.wireless status)"
+		json_get_keys radios
+		for radio in $radios; do
+			json_select $radio
+			json_select interfaces
+			json_get_keys ifaces
+			for ifc in $ifaces; do
+				json_select $ifc
+				json_get_vars ifname
+				[ "$ifname" = "$ifcname" ] && {
+					ubus -S call uci set "{\"config\":\"wireless\", \"type\":\"wifi-iface\",		\
+								\"match\": { \"device\": \"$radio\", \"encryption\": \"wps\" },	\
+								\"values\": { \"encryption\": \"$encryption\", 			\
+										\"ssid\": \"$ssid\", 				\
+										\"key\": \"$key\" } }"
+					ubus -S call uci commit '{"config": "wireless"}'
+					ubus -S call uci apply
+				}
+				json_select ..
+			done
+			json_select ..
+			json_select ..
+		done
+	done
+}
+
 if [ "$ACTION" = "pressed" -a "$BUTTON" = "wps" ]; then
-	cd /var/run/hostapd
-	for socket in *; do
-		[ -S "$socket" ] || continue
-		hostapd_cli -i "$socket" wps_pbc
+	wps_done=0
+	ubusobjs="$( ubus -S list hostapd.* )"
+	for ubusobj in $ubusobjs; do
+		ubus -S call $ubusobj wps_start && wps_done=1
+	done
+	[ $wps_done = 0 ] || return 0
+	wps_done=0
+	ubusobjs="$( ubus -S list wpa_supplicant.* )"
+	for ubusobj in $ubusobjs; do
+		ubus -S call $ubusobj wps_start && wps_done=1
 	done
+	[ $wps_done = 0 ] || wps_catch_credentials &
 fi
 
 return 0