openpvn: Split out config parsing code for reuse

Split out code that parses openvpn configuration file into separate file
that can be later included in various scripts and reused.

Signed-off-by: Michal Hrusecky <michal@hrusecky.net>
(cherry picked from commit 86d8467c8ab792c79809a08c223dd9d40da6da2e)

package/network/services/openvpn/Makefile

@@ -112,6 +112,7 @@ define Package/openvpn-$(BUILD_VARIANT)/install
 		$(1)/etc/init.d \
 		$(1)/etc/config \
 		$(1)/etc/openvpn \
+		$(1)/lib/functions \
 		$(1)/lib/upgrade/keep.d \
 		$(1)/usr/libexec \
 		$(1)/etc/hotplug.d/openvpn
@@ -128,6 +129,10 @@ define Package/openvpn-$(BUILD_VARIANT)/install
 		files/usr/libexec/openvpn-hotplug \
 		$(1)/usr/libexec/openvpn-hotplug
 
+	$(INSTALL_DATA) \
+		files/lib/functions/openvpn.sh \
+		$(1)/lib/functions/openvpn.sh
+
 	$(INSTALL_DATA) \
 		files/etc/hotplug.d/openvpn/01-user \
 		$(1)/etc/hotplug.d/openvpn/01-user

package/network/services/openvpn/files/etc/hotplug.d/openvpn/01-user

@@ -1,17 +1,6 @@
 #!/bin/sh
 
-get_option() {
-	local variable="$1"
-	local option="$2"
-
-	local value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+(([^ \t\\]|\\.)+)[ \t]*$/\1/p' "$config" | tail -n1 | sed -re 's/\\(.)/\1/g')"
-	[ -n "$value" ] || value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+'"'([^']+)'"'[ \t]*$/\1/p' "$config" | tail -n1)"
-	[ -n "$value" ] || value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+"(([^"\\]|\\.)+)"[ \t]*$/\1/p' "$config" | tail -n1 | sed -re 's/\\(.)/\1/g')"
-	[ -n "$value" ] || return 1
-
-	export -n "$variable=$value"
-	return 0
-}
+. /lib/functions/openvpn.sh
 
 [ -e "/etc/openvpn.user" ] && {
 	env -i ACTION="$ACTION" INSTANCE="$INSTANCE" \
@@ -23,7 +12,7 @@ get_option() {
 # Wrap user defined scripts on up/down events
 case "$ACTION" in
 	up|down)
-		if get_option command "$ACTION"; then
+		if get_openvpn_option "$config" command "$ACTION"; then
 			exec /bin/sh -c "$command $ACTION $INSTANCE $*"
 		fi
 	;;

package/network/services/openvpn/files/lib/functions/openvpn.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+get_openvpn_option() {
+	local config="$1"
+	local variable="$2"
+	local option="$3"
+
+	local value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+(([^ \t\\]|\\.)+)[ \t]*$/\1/p' "$config" | tail -n1 | sed -re 's/\\(.)/\1/g')"
+	[ -n "$value" ] || value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+'"'([^']+)'"'[ \t]*$/\1/p' "$config" | tail -n1)"
+	[ -n "$value" ] || value="$(sed -rne 's/^[ \t]*'"$option"'[ \t]+"(([^"\\]|\\.)+)"[ \t]*$/\1/p' "$config" | tail -n1 | sed -re 's/\\(.)/\1/g')"
+	[ -n "$value" ] || return 1
+
+	export -n "$variable=$value"
+	return 0
+}
+