binder: Expose an aidl interface module

Restructure the binder related makefile sections to expose a separate
|libwpa_binder_interface| which can be imported by clients/tests.

While there,
Change the name of the binder service to the name used in the selinux
permissions.

Signed-off-by: Roshan Pius <rpius@google.com>

wpa_supplicant/Android.mk

@@ -49,6 +49,12 @@ ifeq ($(TARGET_ARCH),arm)
 L_CFLAGS += -mabi=aapcs-linux
 endif
 
+# C++ flags for binder interface
+L_CPPFLAGS := -std=c++11 -Wall -Werror
+# TODO: Remove these allowed warnings later.
+L_CPPFLAGS += -Wno-unused-variable -Wno-unused-parameter
+L_CPPFLAGS += -Wno-unused-private-field
+
 INCLUDES = $(LOCAL_PATH)
 INCLUDES += $(LOCAL_PATH)/src
 INCLUDES += $(LOCAL_PATH)/src/common
@@ -1350,13 +1356,8 @@ OBJS += $(DBUS_OBJS)
 L_CFLAGS += $(DBUS_CFLAGS)
 
 ifdef CONFIG_CTRL_IFACE_BINDER
-BINDER=y
+WPA_SUPPLICANT_USE_BINDER=y
 L_CFLAGS += -DCONFIG_BINDER -DCONFIG_CTRL_IFACE_BINDER
-OBJS += binder/binder.cpp binder/binder_manager.cpp
-OBJS += binder/supplicant.cpp binder/iface.cpp
-OBJS += binder/fi/w1/wpa_supplicant/ISupplicant.aidl
-OBJS += binder/fi/w1/wpa_supplicant/ISupplicantCallbacks.aidl
-OBJS += binder/fi/w1/wpa_supplicant/IIface.aidl
 endif
 
 ifdef CONFIG_READLINE
@@ -1596,9 +1597,9 @@ LOCAL_C_INCLUDES := $(INCLUDES)
 ifeq ($(DBUS), y)
 LOCAL_SHARED_LIBRARIES += libdbus
 endif
-ifeq ($(BINDER), y)
+ifeq ($(WPA_SUPPLICANT_USE_BINDER), y)
-LOCAL_AIDL_INCLUDES := $(LOCAL_PATH)/binder frameworks/native/aidl/binder
+LOCAL_SHARED_LIBRARIES += libbinder libutils
-LOCAL_SHARED_LIBRARIES += libutils libbinder
+LOCAL_STATIC_LIBRARIES += libwpa_binder libwpa_binder_interface
 endif
 include $(BUILD_EXECUTABLE)
 
@@ -1638,3 +1639,42 @@ LOCAL_COPY_HEADERS_TO := libwpa_client
 LOCAL_COPY_HEADERS := src/common/wpa_ctrl.h
 LOCAL_COPY_HEADERS += src/common/qca-vendor.h
 include $(BUILD_SHARED_LIBRARY)
+
+ifeq ($(WPA_SUPPLICANT_USE_BINDER), y)
+### Binder interface library ###
+########################
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := libwpa_binder_interface
+LOCAL_AIDL_INCLUDES := \
+    $(LOCAL_PATH)/binder \
+    frameworks/native/aidl/binder
+LOCAL_EXPORT_C_INCLUDE_DIRS := \
+    $(LOCAL_PATH)/binder
+LOCAL_CPPFLAGS := $(L_CPPFLAGS)
+LOCAL_SRC_FILES := \
+    binder/binder_constants.cpp \
+    binder/fi/w1/wpa_supplicant/ISupplicant.aidl \
+    binder/fi/w1/wpa_supplicant/ISupplicantCallbacks.aidl \
+    binder/fi/w1/wpa_supplicant/IIface.aidl
+LOCAL_SHARED_LIBRARIES := libbinder
+include $(BUILD_STATIC_LIBRARY)
+
+### Binder service library ###
+########################
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := libwpa_binder
+LOCAL_CPPFLAGS := $(L_CPPFLAGS)
+LOCAL_CFLAGS := $(L_CFLAGS)
+LOCAL_C_INCLUDES := $(INCLUDES)
+LOCAL_SRC_FILES := \
+    binder/binder.cpp binder/binder_manager.cpp \
+    binder/supplicant.cpp binder/iface.cpp
+LOCAL_SHARED_LIBRARIES := \
+    libbinder \
+    libutils
+LOCAL_STATIC_LIBRARIES := libwpa_binder_interface
+include $(BUILD_STATIC_LIBRARY)
+
+endif # BINDER == y

wpa_supplicant/binder/binder_constants.cpp

@@ -0,0 +1,18 @@
+/*
+ * binder interface for wpa_supplicant daemon
+ * Copyright (c) 2004-2016, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2016, Roshan Pius <rpius@google.com>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "binder_constants.h"
+
+namespace wpa_supplicant_binder {
+namespace binder_constants {
+
+const char kServiceName[] = "wpa_supplicant";
+
+} /* namespace binder_constants */
+} /* namespace wpa_supplicant_binder */

wpa_supplicant/binder/binder_constants.h

@@ -0,0 +1,21 @@
+/*
+ * binder interface for wpa_supplicant daemon
+ * Copyright (c) 2004-2016, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2016, Roshan Pius <rpius@google.com>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef BINDER_CONSTANTS_H
+#define BINDER_CONSTANTS_H
+
+namespace wpa_supplicant_binder {
+namespace binder_constants {
+
+extern const char kServiceName[];
+
+} /* namespace binder_constants */
+} /* namespace wpa_supplicant_binder */
+
+#endif /* BINDER_CONSTANTS_H */

wpa_supplicant/binder/binder_manager.cpp

@@ -9,6 +9,7 @@
 
 #include <binder/IServiceManager.h>
 
+#include "binder_constants.h"
 #include "binder_manager.h"
 
 extern "C" {
@@ -18,10 +19,8 @@ extern "C" {
 
 namespace wpa_supplicant_binder {
 
-const char BinderManager::kBinderServiceName[] = "fi.w1.wpa_supplicant";
 BinderManager *BinderManager::instance_ = NULL;
 
-
 BinderManager * BinderManager::getInstance()
 {
 	if (!instance_)
@@ -43,7 +42,7 @@ int BinderManager::registerBinderService(struct wpa_global *global)
 	/* Create the main binder service object and register with
 	 * system service manager. */
 	supplicant_object_ = new Supplicant(global);
-	android::String16 service_name(kBinderServiceName);
+	android::String16 service_name(binder_constants::kServiceName);
 	android::defaultServiceManager()->addService(
 		service_name,
 		android::IInterface::asBinder(supplicant_object_));

wpa_supplicant/binder/binder_manager.h

@@ -29,8 +29,6 @@ namespace wpa_supplicant_binder {
  */
 class BinderManager {
 public:
-	static const char kBinderServiceName[];
-
 	static BinderManager * getInstance();
 	static void destroyInstance();
 	int registerBinderService(struct wpa_global *global);