# Please install the following prerequisites (instructions for each follows):
# 	Android OS SDK: http://source.android.com/download
#
# Install and prepare the Android OS SDK ( http://source.android.com/download )
# on Debian or Ubuntu

### these modify the calling shell
# workaround for cross-compiling bug in autoconf
export ac_cv_func_malloc_0_nonnull=yes
export ac_cv_func_setpgrp_void=yes

EXTERNAL_ROOT := $(shell pwd)

# Android now has 64-bit and 32-bit versions of the NDK for GNU/Linux.  We
# assume that the build platform uses the appropriate version, otherwise the
# user building this will have to manually set NDK_PROCESSOR or NDK_TOOLCHAIN.
CPU := $(shell uname -m)
ifeq ($(CPU),x86_64)
 NDK_PROCESSOR=x86_64
else
 NDK_PROCESSOR=x86
endif

# Android NDK setup
NDK_BASE ?= /opt/android-ndk
NDK_PLATFORM_LEVEL ?= 5
NDK_ABI=arm
NDK_COMPILER_VERSION = 4.6
NDK_SYSROOT=$(NDK_BASE)/platforms/android-$(NDK_PLATFORM_LEVEL)/arch-$(NDK_ABI)
APP_ABI=armeabi
# NDK platform level, aka APP_PLATFORM, is equivalent to minSdkVersion
APP_PLATFORM := android-$(shell sed -n 's,.*android:minSdkVersion="\([0-9][0-9]*\)".*,\1,p' \
	$(EXTERNAL_ROOT)/../AndroidManifest.xml)
NDK_SYSROOT=$(NDK_BASE)/platforms/$(APP_PLATFORM)/arch-$(NDK_ABI)
NDK_TOOLCHAIN_VERSION=4.6
NDK_UNAME := $(shell uname -s | tr '[A-Z]' '[a-z]')
ifeq ($(NDK_ABI),x86)
 HOST = i686-linux-android
 NDK_TOOLCHAIN = $(NDK_ABI)-$(NDK_TOOLCHAIN_VERSION)
else
 HOST = $(NDK_ABI)-linux-androideabi
 NDK_TOOLCHAIN = $(HOST)-$(NDK_TOOLCHAIN_VERSION)
endif
NDK_TOOLCHAIN_BASE=$(NDK_BASE)/toolchains/$(NDK_TOOLCHAIN)/prebuilt/$(NDK_UNAME)-$(NDK_PROCESSOR)

# include Android's build flags
TARGET_ARCH_ABI = $(APP_ABI)
include $(NDK_BASE)/toolchains/$(NDK_TOOLCHAIN)/setup.mk

CC := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-gcc --sysroot=$(NDK_SYSROOT)
CXX := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-g++
CPP := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-cpp
LD := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-ld
AR := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-ar
RANLIB := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-ranlib
STRIP := $(NDK_TOOLCHAIN_BASE)/bin/$(HOST)-strip \
	--strip-unneeded -R .note -R .comment

CFLAGS = -DANDROID $(TARGET_CFLAGS)
LDFLAGS = -llog $(TARGET_LDFLAGS)

# change 'release' to 'debug' for unoptimized debug builds
ifeq ($(APP_ABI),armeabi-v7a)
	CFLAGS += $(TARGET_arm_release_CFLAGS)
endif
ifeq ($(APP_ABI),armeabi)
	CFLAGS += $(TARGET_thumb_release_CFLAGS)
endif

.PHONY = clean showsetup \
	assets assets-clean \
	openssl-static openssl-static-clean \
	libevent libevent-clean \
	iptables iptables-clean \
	tor tor-clean \
	obfsproxy obfsproxy-clean \
	obfsclient obfsclient-clean \
	privoxy privoxy-clean

all: assets

#------------------------------------------------------------------------------#
# openssl

lib/libcrypto.a:
	cd openssl && \
		./Configure android -DL_ENDIAN && \
		make CC="$(CC)" ANDROID_DEV=$(NDK_BASE)/platforms/android-8/arch-arm /usr build_libs

lib/libssl.a:
	cp config.sub openssl
	cp config.guess openssl
	cd openssl && \
		./Configure android -DL_ENDIAN && \
		make CC="$(CC)" ANDROID_DEV=$(NDK_BASE)/platforms/android-8/arch-arm /usr build_libs

openssl-build-stamp: lib/libcrypto.a lib/libssl.a
	touch openssl-build-stamp

openssl: openssl-build-stamp
	test -d lib || mkdir lib
	test -d include || mkdir include
	test -d include/openssl || mkdir include/openssl
	cp openssl/libcrypto.a lib/libcrypto.a
	cp openssl/libssl.a lib/libssl.a
	cp openssl/include/openssl/* include/openssl

openssl-clean:
	-rm openssl-build-stamp
	-rm lib/libcrypto.a
	-rm lib/libssl.a
	-cd openssl && \
		git clean -fdx

#------------------------------------------------------------------------------#
# libevent

libevent/Makefile:
	cd libevent && ./autogen.sh
	cp config.sub libevent
	cp config.guess libevent
	cd libevent && \
		CC="$(CC)" AR="$(AR)" RANLIB=$(RANLIB) CFLAGS="$(CFLAGS) -I$(EXTERNAL_ROOT)/include" LDFLAGS="$(LDFLAGS)" \
			./configure \
				--host=$(HOST) \
				--disable-shared

libevent-build-stamp: libevent/Makefile
	$(MAKE) -C libevent all-am
	touch libevent-build-stamp

libevent: openssl libevent-build-stamp
	test -d lib || mkdir lib
	test -d include || mkdir include
	cp libevent/.libs/libevent.a lib
	cp -R libevent/include/event2 include

libevent-clean:
	-rm -f include/event2
	-rm -f lib/libevent.a
	-rm -f libevent-build-stamp
	-cd libevent && \
		git clean -fdx

#------------------------------------------------------------------------------#
# iptables

iptables/Makefile:
	cp iptables-patch-1 iptables
	cp iptables-patch-2 iptables
	cp iptables-patch-3 iptables
	-cd iptables && \
	 	patch -N -p1 --reject-file=- < iptables-patch-1
	-cd iptables && \
	 	patch -N -p1 --reject-file=- < iptables-patch-2
	-cd iptables && \
	 	patch -N -p1 --reject-file=- < iptables-patch-3
	cd iptables && ./autogen.sh
	cp config.sub iptables
	cp config.guess iptables
	cd iptables && \
 		CC="$(CC)" AR="$(AR)" RANLIB=$(RANLIB) CFLAGS="$(CFLAGS) -I$(EXTERNAL_ROOT)/include" LDFLAGS="$(LDFLAGS)" \
			./configure --host=$(HOST) --disable-shared --enable-static

iptables-build-stamp: iptables/Makefile
	$(MAKE) -C iptables 
	touch iptables-build-stamp
	cp iptables/iptables/xtables-multi bin/xtables

iptables: iptables-build-stamp

iptables-clean:
	-rm -f iptables-build-stamp
	-rm bin/xtables
	-cd iptables && \
		git clean -fdx

#------------------------------------------------------------------------------#
# tor

tor/configure: 
	cd tor && \
	 ./autogen.sh

tor/Makefile: tor/configure
	cp config.sub tor
	cp config.guess tor
	cd tor && \
                CC="$(CC)" AR="$(AR)" RANLIB=$(RANLIB) CFLAGS="$(CFLAGS) -D_FORTIFY_SOURCE=2 -fPIE -fwrapv -fno-strict-aliasing -fno-strict-overflow" LDFLAGS="$(LDFLAGS)" \
                        LIBS="-L$(EXTERNAL_ROOT)/lib" CFLAGS="-I$(EXTERNAL_ROOT)/include -I$(EXTERNAL_ROOT)/include/event2" \
                        ./configure \
                                --host=$(HOST) \
				--disable-asciidoc \
				--enable-static-libevent --with-libevent-dir=$(EXTERNAL_ROOT) \
				--enable-static-openssl --with-openssl-dir=$(EXTERNAL_ROOT) \
				--disable-linker-hardening --disable-gcc-hardening 

tor-build-stamp: tor/Makefile
	$(MAKE) -C tor all-am
	touch tor-build-stamp

tor: libevent openssl tor-build-stamp
	test -d bin || mkdir bin
	cp tor/src/or/tor bin

tor-clean:
	-rm -f bin/tor
	-rm -f tor-build-stamp
	-cd tor && \
		git clean -fdx


#------------------------------------------------------------------------------#
# obfsproxy


obfsproxy/Makefile: 
	cp obfsproxy_android_no_hardening.patch obfsproxy
	-cd obfsproxy && \
	 	patch -N -p1 --reject-file=- < obfsproxy_android_no_hardening.patch
	cd obfsproxy && \
	 	./autogen.sh
	cp config.sub obfsproxy
	cp config.guess obfsproxy
	cd obfsproxy && \
                CC="$(CC)" AR="$(AR)" RANLIB=$(RANLIB) CFLAGS="$(CFLAGS) -D_FORTIFY_SOURCE=2 -fPIE -fwrapv -fno-strict-aliasing -fno-strict-overflow" LDFLAGS="$(LDFLAGS)" \
			libevent_LIBS="-L$(EXTERNAL_ROOT)/lib -levent" libevent_CFLAGS="-I$(EXTERNAL_ROOT)/include" \
			libcrypto_LIBS="-L$(EXTERNAL_ROOT)/lib -lcrypto" libcrypto_CFLAGS="-I$(EXTERNAL_ROOT)/include" \
                        ./configure \
                                --host=$(HOST) \

obfsproxy-build-stamp: obfsproxy/Makefile
	$(MAKE) -C obfsproxy
	touch obfsproxy-build-stamp

obfsproxy: openssl libevent obfsproxy-build-stamp
	test -d bin || mkdir bin
	cp obfsproxy/obfsproxy bin

obfsproxy-clean:
	-rm -f bin/obfsproxy
	-rm -f obfsproxy-build-stamp
	-cd obfsproxy && \
		git clean -fdx

#------------------------------------------------------------------------------#
# obfsclient


obfsclient/Makefile: 
	cd obfsclient && \
	 	./autogen.sh
	cp config.sub obfsclient
	cp config.guess obfsclient
	cd obfsclient && \
                CPP="$(CPP)" CXX="$(CXX)" AR="$(AR)" RANLIB=$(RANLIB) CPPFLAGS="$(CFLAGS) -D_FORTIFY_SOURCE=2 -fPIE -fwrapv -fno-strict-aliasing -fno-strict-overflow" CXXFLAGS="$(CFLAGS) -D_FORTIFY_SOURCE=2 -fPIE -fwrapv -fno-strict-aliasing -fno-strict-overflow" LDFLAGS="$(LDFLAGS)" \
 LIBS="-L$(EXTERNAL_ROOT)/lib" CFLAGS="-I$(EXTERNAL_ROOT)/include -I$(EXTERNAL_ROOT)/include/event2" \
                        ./configure \
                                --host=$(HOST) \

obfsclient-build-stamp: obfsclient/Makefile
	$(MAKE) -C obfsclient
	touch obfsclient-build-stamp

obfsclient: openssl libevent obfsclient-build-stamp
	test -d bin || mkdir bin
	cp obfsclient/obfsclient bin

obfsclient-clean:
	-rm -f bin/obfsclient
	-rm -f obfsclient-build-stamp
	-cd obfsclient && \
		git clean -fdx

#------------------------------------------------------------------------------#
# privoxy


privoxy/config.log:
	tar xzvf privoxy.tar.gz
	mv privoxy*stable privoxy
	cp privoxy.configure.in privoxy/configure.in
	cd privoxy && \
	  autoheader
	cd privoxy && \
	  autoconf
	cp config.sub privoxy
	cp config.guess privoxy	
	cd privoxy && \
                CC="$(CC)" AR="$(AR)" RANLIB=$(RANLIB) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \
                        ./configure \
                                --host=arm-linux-eabi --enable-pthread
## --disable-pthread 

privoxy-build-stamp: privoxy/config.log
	$(MAKE) -C privoxy
	touch privoxy-build-stamp

privoxy: privoxy-build-stamp
	test -d bin || mkdir bin
	cp privoxy/privoxy bin

privoxy-clean:
	-rm -f bin/privoxy
	-rm -f privoxy-build-stamp
	-rm -rf privoxy

#------------------------------------------------------------------------------#
# JTorControl library

jtorctl/bin/jtorctl.jar:
	test -d jtorctl/bin || mkdir jtorctl/bin
	cd jtorctl && \
		javac -source 1.6 -target 1.6 net/freehaven/tor/control/TorControlConnection.java -d bin
	cd jtorctl/bin && \
		jar cvf jtorctl.jar *

jtorctl-build-stamp: jtorctl/bin/jtorctl.jar
	touch jtorctl-build-stamp

jtorctl: jtorctl-build-stamp
	test -d bin || mkdir bin
	cp jtorctl/bin/jtorctl.jar bin

jtorctl-clean:
	-rm -rf jtorctl/bin
	-rm jtorctl-build-stamp

#------------------------------------------------------------------------------#
#create and clean assets: FYI - tor is stored as a ZIP file with an mp3 extension
#in order to stop Android OS (older devices) from trying to compress/decompress it
#this is related to a bug in compression of assets and resources > 1MB

assets: tor privoxy jtorctl obfsproxy iptables
	install -d ../libs/armeabi
	install -d ../libs
	install bin/privoxy ../libs/armeabi/libprivoxy.so
	install bin/obfsproxy ../libs/armeabi/libobfsproxy.so
	install bin/jtorctl.jar ../libs
	install bin/tor ../libs/armeabi/libtor.so
	install bin/xtables ../libs/armeabi/libxtables.so

assets-clean:
	-rm ../libs/armeabi/libxtables.so
	-rm ../libs/armeabi/libtor.so
	-rm ../libs/armeabi/libprivoxy.so
	-rm ../libs/armeabi/libobfsproxy.so
	-rm ../libs/jtorctl.jar

#------------------------------------------------------------------------------#
# cleanup, cleanup, put the toys away

clean: openssl-clean libevent-clean tor-clean privoxy-clean jtorctl-clean assets-clean

#------------------------------------------------------------------------------#
# debugging stuff

showsetup:
	@echo "NDK_TOOLCHAIN_VERSION: $(NDK_TOOLCHAIN_VERSION)"
	@echo "NDK_TOOLCHAIN: $(NDK_TOOLCHAIN)"
	@echo "NDK_SYSROOT: $(NDK_SYSROOT)"
	@echo "APP_PLATFORM: $(APP_PLATFORM)"
	@echo "APP_ABI: $(APP_ABI)"
	@echo "HOST: $(HOST)"
	@echo "CC: $(CC)"
	@echo "LD: $(LD)"
	@echo "CFLAGS: $(CFLAGS)"
	@echo "LDFLAGS: $(LDFLAGS)"