hostapd: Find device by MAC address

With wireless device as members in bridges, we cannot predict the name
very well. So we will use the MAC address and find the correct device
name when we launch hostapd.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/initscripts/packages/hostapd

@@ -2,6 +2,20 @@
 . /etc/sysconfig/rc
 . ${rc_functions}
 
+find_interface() {
+	local address="${1}"
+
+	local path
+	for path in /sys/class/net/*; do
+		if [ -s "${path}/address" ] && [ "$(<${path}/address)" = "${address}" ]; then
+			basename "${path}"
+			return 0
+		fi
+	done
+
+	return 1;
+}
+
 CHANNEL="6"
 COUNTRY="00"
 TXPOWER="auto"
@@ -12,8 +26,15 @@ eval $(/usr/local/bin/readhash /var/ipfire/wlanap/settings)
 
 case "${1}" in
 	start)
+		interface="$(find_interface "${INTERFACE}")"
+		if [ -z "${interface}" ]; then
+			boot_mesg "Could not find interface with address ${INTERFACE} for wireless access point"
+			echo_failure
+			exit 1
+		fi
+
 		boot_mesg "Starting hostapd... "
-		loadproc /usr/bin/hostapd -B /etc/hostapd.conf
+		loadproc /usr/bin/hostapd -B /etc/hostapd.conf -i "${interface}"
 		;;
 
 	stop)