Building the Strongswan for Android on OSX (High Sierra)

Reference

• Building the strongSwan VPN Client for Android
• strongswan android编译过程
• Strongswan Git for OpenSSL

Install Build Tools and Library

• Refer to source:HACKING
• Install gmp

    $ brew install gmp

NOTE. If you use bison 2.x which come with OSX, it will fail to build "settings_parser.y", so please ensure the bison is version 3.x by "bison -V".

To install the new bison and make it will be executed in building process, you can do:

    $ brew install bison
    $ brew link bison --force
    $ source ~/.bash_profile

Prepare Strongswan and OpenSSL (BoringSSL) Source Tree

For building in OSX, try to put the source in case-insensitive filesystem (the default filesystem), or when use the Android Studio to build the app, it will complains the file system setting is not the same as IDE.

    # Make source folder
    $ git clone https://github.com/Ed-Yang/strongswan-android.git
    $ cd strongswan-android

    # Get strongswan latest source
    $ git clone git://git.strongswan.org/strongswan.git
    $ export SS_HOME=`pwd`/strongswan

    $ cd ./strongswan/src/frontends/android/app/src/main/jni

    # Get boringssl source 
    $ git clone git://git.strongswan.org/android-ndk-boringssl.git -b ndk-static openssl

    or 

    # Get openssl source (NOT WORK !!!!)
    $ git clone git://git.strongswan.org/android-ndk-openssl.git -b ndk-static openssl

    $ cd ${SS_HOME}

    # See Alexandre Duret Lutz's Autotools tutorial for aclocal (I did not read....)
    $ aclocal -I m4
    $ ./autogen.sh
    $ ./configure
    $ make dist

    Done

Take a note, if we want to clean the source tree:

    $ make maintainer-clean

Install and Setup Android Studio

• Install Android SDK and NDK. The Android Studio will be installed to "~/Library/Android".
• Launch Androind Studio, click "Open an existing Andriod Studo project" and select folder "${SS_HOME}/src/frontends/android".
• The initial launch of Android Studio, the NDK directory is not known. Select "File-->Project Structure" to install or setup NDK path (ex. ~/Library/Android/sdk/ndk-bundle).

Build Native Part

• Modify cd ${SS_HOME}/src/frontends/android/app/src/main/jni/Application.mk

    #APP_ABI := armeabi arm64-v8a x86 x86_64 mips mips64
    APP_ABI := armeabi-v7a arm64-v8a x86 x86_64 

• Build

    $ cd ${SS_HOME}/src/frontends/android/app/src/main/jni
    $ ~/Library/Android/sdk/ndk-bundle/ndk-build

Building the App

• Select "Build-->Make Project".

Run APP

• In Androind Studio, select "Tools-->AVD Manager" to create a virtual devie.
• Select "Run-->Run 'app'"

Author

Edward Yang, June 16, 2018.