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Building Serval for Android =========================== These instructions have been tested for a Nexus One device, but may work also for other devices. However, it is likely that small modifications are necessary to make this work for other devices, such as using a different NDK, compiler, kernel source tree, etc. Serval builds into an Android app that bundles a kernel module. Running this app requires a rooted Android device (with ability to run 'su'), or otherwise the kernel module cannot be loaded. The app allows you to easily load the kernel module and can also add and remove service table entries. Note that the app will probably only run on a specific type of device and version of Android, since the kernel module must match the running kernel. Prerequisites: * Root access on your Android device. * Kernel source code matching your cross-compile environment (see instructions below). * Android NDK: http://developer.android.com/sdk/ndk/index.html (r5b is known to work). * Android debug bridge - adb (from, e.g., the Android SDK). * Ant (or Eclipse) Configuration: Run the top-level configure script as follows: $ ./configure --with-android-sdk=<path/to/sdk> Getting the right kernel source ------------------------------- Due to kernel features and versioning, you need to compile the Serval kernel module against the exact version of the kernel that runs on your Android device. Otherwise the kernel module will not load. You can download the kernel source code matching your device by following the instructions at the end of the following page (under "Downloading kernels"): http://source.android.com/source/downloading.html For instance, to clone the kernel source for devices with an MSM CPU (e.g., Nexus One), do: $ git clone https://android.googlesource.com/kernel/msm.git This will leave you with an empty checkout, so you need to checkout a valid branch: $ cd msm $ git checkout remotes/origin/android-msm-2.6.35 On your device, go to "Settings->About phone->Kernel version" to figure out the exact kernel it is running. The version string should look something like "18.104.22.168-59465-g42bad32". The first number identifies the version of the kernel, the second number is the number of the local commit in the source code repository where the kernel was compiled. The end of the string (following the 'g') denotes the prefix of the SHA1 hash that identifies the exact commit. Now, use the hash string to checkout the exact commit that was used to compile the kernel for your device, e.g: $ git checkout 42bad32 If there is no commit matching the kernel running on your device, you can try to use the "HEAD" commit of the repository and then manually specify the kernel string (see below). Now you need to prepare your kernel source tree. First put the cross compiler in your path, e.g.: $ export PATH=$PATH/<path to NDK>/build/prebuilt/darwin-x86/arm-eabi-4.4.0/bin/ Now pull the kernel configuration from your device: $ adb pull /proc/config.gz $ gunzip config.gz $ cp config <path to kernel source>/.config Configure the kernel sources: $ ARCH=arm CROSS_COMPILE=arm-eabi- make oldconfig Prepare the kernel source for compilation: $ ARCH=arm CROSS_COMPILE=arm-eabi- make prepare Check that the generated kernel version string matches that of your device: $ cat <path to kernel source>/include/config/kernel.release If the string does not match, manually override the kernel version string so that it matches your device's, e.g.: $ echo "-59465-g42bad32" > <path to kernel source>/.scmversion After overriding, re-run the prepare step. Your kernel source tree is now ready. Compiling the Kernel module --------------------------- Make sure you run (./autogen.sh) ./configure to generate the Makefiles. 1. Make sure the Android NDK cross-compiler is in your PATH. $ export PATH=</path/to/android/ndk/compiler/bin:$PATH> 2. Enter src/stack and issue the following command: $ ARCH=arm CROSS_COMPILE=arm-eabi- make serval.ko KDIR=<Path to kernel source> Building the Serval Android app ------------------------------- 1. Compile the sources from the top-level directory (this will generate the Java bindings that the Serval app needs): $ ./configure --with-android-sdk=<path/to/sdk> $ make 2. Compile the kernel module as instructed above. 3. Build native libraries for Android: $ cd android/Serval $ <Path to NDK>/ndk-build The libraries and binaries can now be found under "libs". 4. Build the Serval Android app with Ant: $ cd android/Serval (If not already there) $ ant debug 5. Install on a (rooted) Android device: $ ant install Manually loading the kernel module ---------------------------------- Run this command through "adb": $ adb shell su -c 'insmod /path/to/kernel/module/on/device/serval.ko'