Build ipsec on Android.

Note: this does not fully work as [ (or even test) is not supported on
Android by default.

Android.mk.in

@@ -86,4 +86,5 @@ include $(addprefix $(LOCAL_PATH)/src/,$(addsuffix /Android.mk, \
 		libfreeswan \
 		stroke \
 		starter \
+		ipsec \
 	))

src/ipsec/Android.mk

@@ -0,0 +1,31 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+# build ipsec ------------------------------------------------------------------
+
+LOCAL_MODULE := ipsec
+
+LOCAL_MODULE_CLASS := EXECUTABLES
+
+GEN := $(local-intermediates-dir)/ipsec
+
+$(GEN) : PRIVATE_PATH := $(LOCAL_PATH)
+$(GEN) : PRIVATE_CUSTOM_TOOL = sed \
+	-e "s:@IPSEC_SHELL@:/system/bin/sh:" \
+	-e "s:@IPSEC_VERSION@:$(strongswan_VERSION):" \
+	-e "s:@IPSEC_NAME@:strongSwan:" \
+	-e "s:@IPSEC_DISTRO@::" \
+	-e "s:@IPSEC_DIR@:$(strongswan_DIR):" \
+	-e "s:@IPSEC_SBINDIR@:$(strongswan_SBINDIR):" \
+	-e "s:@IPSEC_CONFDIR@:$(strongswan_CONFDIR):" \
+	-e "s:@IPSEC_PIDDIR@:$(strongswan_PIDDIR):" \
+	$< > $@ && chmod +x $@
+
+$(GEN) : $(strongswan_PATH)/Android.mk
+$(GEN) : $(LOCAL_PATH)/ipsec.in
+	$(transform-generated-source)
+
+LOCAL_GENERATED_SOURCES := $(GEN)
+
+include $(BUILD_SYSTEM)/base_rules.mk
+