Add support for Android L

Build position-indepent executables, required for Android L (5.0+)
They also work with kitkat.

Add new maketarget "cross-android-old" that builds without PIE
for older versions.

Include both new and old versions in latest-android.zip. Add arm64.

Hopefully solves github PR #14.

Makefile

@@ -56,15 +56,32 @@ iodine-latest:
 	@for i in README.md CHANGELOG TODO; do cp $$i iodine-latest/$$i.txt; done
 	@unix2dos iodine-latest/*
 
+#non-PIE build for old android
+cross-android-old:
+	@(cd src; $(MAKE) base64u.c base64u.h)
+	@(cd src; ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk MY_PLATFORM=old)
+
+#Position-indepedent build for modern android
 cross-android:
 	@(cd src; $(MAKE) base64u.c base64u.h)
-	@(cd src; ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk)
+	@(cd src; ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk MY_PLATFORM=kitkat)
 
 iodine-latest-android.zip: iodine-latest
 	@mv iodine-latest iodine-latest-android
-	@mkdir -p iodine-latest-android/armeabi iodine-latest-android/x86
+	@mkdir -p iodine-latest-android/pre-kitkat/armeabi
+	@mkdir -p iodine-latest-android/pre-kitkat/x86
+	@$(MAKE) cross-android-old TARGET_ARCH_ABI=armeabi
+	@cp src/libs/armeabi/* iodine-latest-android/pre-kitkat/armeabi
+	@$(MAKE) cross-android-old TARGET_ARCH_ABI=x86
+	@cp src/libs/x86/* iodine-latest-android/pre-kitkat/x86
+	@rm -rf src/libs src/obj
+	@mkdir -p iodine-latest-android/armeabi
+	@mkdir -p iodine-latest-android/arm64-v8a
+	@mkdir -p iodine-latest-android/x86
 	@$(MAKE) cross-android TARGET_ARCH_ABI=armeabi
 	@cp src/libs/armeabi/* iodine-latest-android/armeabi
+	@$(MAKE) cross-android TARGET_ARCH_ABI=arm64-v8a
+	@cp src/libs/arm64-v8a/* iodine-latest-android/arm64-v8a
 	@$(MAKE) cross-android TARGET_ARCH_ABI=x86
 	@cp src/libs/x86/* iodine-latest-android/x86
 	@cp README-android.txt iodine-latest-android

README-android.txt

@@ -13,7 +13,7 @@ Extra README file for Android
 2. Find/build a compatible tun.ko for your specific Android kernel
 
 3. Copy tun.ko and the iodine binary to your device:
-   (Almost all devices need the armeabi binary. Only Intel powered 
+   (Almost all devices need the armeabi binary. Only Intel powered
    ones need the x86 build.)
 
 		adb push tun.ko /data/local/tmp
@@ -35,11 +35,15 @@ For more information: http://blog.bokhorst.biz/5123
 2. Download and unpack the iodine sources
 
 3. Build:
-		cd src
-		make base64u.h base64u.c
-		ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk
+	cd src
+	make base64u.h base64u.c
+	ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk MY_PLATFORM=kitkat
 
    or run "make cross-android" in the iodine root directory.
-   To build for other archs, specify TARGET_ARCH_ABI: 
+   To build for other archs, specify TARGET_ARCH_ABI:
 		"make cross-android TARGET_ARCH_ABI=x86"
 
+   For older android versions (pre-kitkat), build with "make cross-android" in the
+   root directory, or manually like above but without the MY_PLATFORM part.
+
+   The iodine binary ends up in src/libs/<arch>/iodine

src/Android.mk

@@ -20,5 +20,14 @@ LOCAL_SRC_FILES := tun.c dns.c read.c encoding.c login.c base32.c base64.c base6
 LOCAL_CFLAGS    := -c -DANDROID -DLINUX -DIFCONFIGPATH=\"/system/bin/\" -Wall -DGITREVISION=\"$(HEAD_COMMIT)\"
 LOCAL_LDLIBS    := -lz
 
+#Choose platform level (for PIE support)
+ifeq (kitkat, $(strip $(MY_PLATFORM)))
+APP_PLATFORM := android-16
+LOCAL_CFLAGS += -fPIE
+LOCAL_LDFLAGS += -fPIE -pie
+else
+APP_PLATFORM := android-3
+endif
+
 include $(BUILD_EXECUTABLE)
 

src/android_dns.h

@@ -17,6 +17,9 @@
 #ifndef __FIX_ANDROID_H__
 #define __FIX_ANDROID_H__
 
+/* Newer android platforms can have this data already */
+#ifndef C_IN
+
 typedef struct {
 	unsigned id :16;
 	unsigned rd :1;
@@ -51,4 +54,6 @@ typedef struct {
 #define T_TXT		16
 #define T_SRV		33
 
+#endif /* !C_IN */
+
 #endif

src/client.c

@@ -32,10 +32,10 @@
 #ifdef WINDOWS32
 #include "windows.h"
 #else
+#include <arpa/nameser.h>
 #ifdef ANDROID
 #include "android_dns.h"
 #endif
-#include <arpa/nameser.h>
 #ifdef DARWIN
 #define BIND_8_COMPAT
 #include <arpa/nameser_compat.h>

src/dns.c

@@ -27,9 +27,6 @@
 #ifdef WINDOWS32
 #include "windows.h"
 #else
-#ifdef ANDROID
-#include "android_dns.h"
-#endif
 #include <arpa/nameser.h>
 #ifdef DARWIN
 #define BIND_8_COMPAT
@@ -38,6 +35,9 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <err.h>
+#ifdef ANDROID
+#include "android_dns.h"
+#endif
 #endif