ahcpd: rework init script (based on a patch by alx)

- use uci network interface names instead of direct interface names
 - start multiple instances if configured to do so

git-svn-id: svn://svn.openwrt.org/openwrt/packages@18862 3c298f89-4303-0410-b956-a3cf2f4a3e73

ipv6/ahcpd/files/ahcpd.config

@@ -1,6 +1,6 @@
-config ahcpd
-	option interfaces "wl0"
-	option no_config true
-	option no_dns false
-	option ipv4_only false
-	option ipv6_only false
+config 'ahcpd'
+	option 'no_dns' 'false'
+	option 'ipv4_only' 'false'
+	option 'ipv6_only' 'false'
+	option 'no_config' 'false'
+	#list 'interface' 'wlan'

ipv6/ahcpd/files/ahcpd.init

@@ -3,20 +3,20 @@
 START=71
 
 pidfile=/var/run/ahcpd.pid
+addif() {
+	config_get ifname $1 ifname
+	append interfaces "$ifname"
+}
 
 ahcpd_config() {
 	local cfg="$1"
-	config_get interfaces "$cfg" interfaces
+	interfaces=
+	config_list_foreach $cfg interface addif
+	[ -z "$interfaces" ] && return 0
 	config_get_bool no_config "$cfg" no_config 0
 	config_get_bool ipv4_only "$cfg" ipv4_only 0
 	config_get_bool ipv6_only "$cfg" ipv6_only 0
 	config_get_bool no_dns "$cfg" no_dns 0
-}
-
-start() {
-	config_load ahcpd
-	config_foreach ahcpd_config ahcpd
-	mkdir -p /var/lib
 	if [ "$no_config" -eq 0 ]; then
 		unset no_config
 	fi
@@ -38,6 +38,14 @@ start() {
 	fi
 }
 
+start() {
+	include /lib/network
+	scan_interfaces
+	config_load ahcpd
+	mkdir -p /var/lib
+	config_foreach ahcpd_config ahcpd
+}
+
 stop() {
 	[ -e $pidfile ] && kill $(cat $pidfile)
 	[ -e $pidfile ] && sleep 2