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‎README.md‎

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# tcpdump-android-builds
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# Tcpdump Android Builds
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Precompiled Tcpdump binaries for Android are provided for ARM, ARM64, X86, X86-64. Download from [releases](https://github.com/extremecoders-re/tcpdump-android-builds/releases).
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```
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Tcpdump version: 4.9.2
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Libpcap version: 1.9.0
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Android API: 23
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NDK: android-ndk-r18b
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```
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## Compilation Steps
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1. Download the Android NDK from https://developer.android.com/ndk/downloads/. The latest available at the time of writing is `ndk-r18b`.
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Extract the zip to a suitable location.
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```
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$ wget https://dl.google.com/android/repository/android-ndk-r18b-linux-x86_64.zip
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```
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2. Clone the repository
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```
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$ git clone https://github.com/extremecoders-re/tcpdump-android-builds.git
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$ cd tcpdump-android-builds
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```
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3. For compiling, set `NDK` to the location of the android sdk directory and run the corresponding build script.
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```
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$ NDK=/home/ubuntu/workspace/android-ndk-r18b/ ./build_x86.sh
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$ NDK=/home/ubuntu/workspace/android-ndk-r18b/ ./build_x86_64.sh
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$ NDK=/home/ubuntu/workspace/android-ndk-r18b/ ./build_arm.sh
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$ NDK=/home/ubuntu/workspace/android-ndk-r18b/ ./build_arm64.sh
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```
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4. Compiled binaries will be located in the corresponding `tcpdumpbuild` directory.
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## How to use tcpdump?
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- https://www.tcpdump.org/manpages/tcpdump.1.html
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- https://www.andreafortuna.org/technology/android/how-to-install-and-run-tcpdump-on-android-devices/
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## References
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- https://github.com/eakteam/tcpdump-android
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- https://github.com/chatch/tcpdump-android
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- https://github.com/imrivera/build-android-tcpdump
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- https://developer.android.com/ndk/guides/standalone_toolchain

‎build_arm.sh‎

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#!/bin/bash
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tcpdump_ver=4.9.2
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libpcap_ver=1.9.0
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android_api_def=23
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toolchain_arch=arm
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toolchain_dir=toolchain_arm
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ndk_dir_def=android-ndk-r18b
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#-------------------------------------------------------#
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tcpdump_dir=tcpdump-${tcpdump_ver}
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libpcap_dir=libpcap-${libpcap_ver}
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if [ ${NDK} ]
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then
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ndk_dir=${NDK}
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else
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ndk_dir=${ndk_dir_def}
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fi
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ndk_dir=`readlink -f ${ndk_dir}`
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if [ ${ANDROID_API} ]
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then
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android_api=${ANDROID_API}
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else
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android_api=${android_api_def}
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fi
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echo "_______________________"
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echo ""
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echo "NDK - ${ndk_dir}"
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echo "Android API: ${android_api}"
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echo "_______________________"
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exit_error()
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{
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echo " _______"
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echo "| |"
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echo "| ERROR |"
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echo "|_______|"
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exit 1
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}
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{
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if [ $# -ne 0 ]
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then
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if [ -d $1 ]
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then
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cd $1
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else
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echo directory $1 not found
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exit_error
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fi
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else
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mkdir tcpdumpbuild-${toolchain_arch}
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cd tcpdumpbuild-${toolchain_arch}
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fi
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}
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{
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echo " ____________________"
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echo "| |"
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echo "| TOOLCHAIN |"
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echo "|____________________|"
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if [ -d "$toolchain_dir" ]
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then
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echo Toolchain already exist! Nothing to do.
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else
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echo Creating toolchain...
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mkdir $toolchain_dir
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python ${ndk_dir}/build/tools/make_standalone_toolchain.py \
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--arch=${toolchain_arch} \
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--api=${android_api} \
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--install-dir=${toolchain_dir} \
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--force
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if [ $? -ne 0 ]
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then
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rm -fr $toolchain_dir
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exit_error
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fi
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fi
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export PATH=`pwd`/$toolchain_dir/bin:$PATH
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target_host=arm-linux-androideabi
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export AR=$target_host-ar
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export AS=$target_host-clang
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export CC=$target_host-clang
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export CXX=$target_host-clang++
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export LD=$target_host-ld
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export STRIP=$target_host-strip
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export RANLIB=$target_host-ranlib
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export STRIP=$target_host-strip
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export CFLAGS="-static -O2 -fPIE -fPIC -march=armv7-a -mthumb -mfloat-abi=softfp -mfpu=vfpv3-d16 -mfpu=neon"
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export LDFLAGS="-pie"
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}
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# download & untar libpcap + tcpdump
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{
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echo " _______________________________"
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echo "| |"
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echo "| DOWNLOADING LIBPCAP & TCPDUMP |"
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echo "|_______________________________|"
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tcpdump_file=${tcpdump_dir}.tar.gz
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libpcap_file=${libpcap_dir}.tar.gz
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tcpdump_link=http://www.tcpdump.org/release/${tcpdump_file}
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libpcap_link=http://www.tcpdump.org/release/${libpcap_file}
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if [ -f ${tcpdump_file} ]
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then
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echo ${tcpdump_file} already downloaded! Nothing to do.
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else
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echo Download ${tcpdump_file}...
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wget ${tcpdump_link}
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if [ ! -f ${tcpdump_file} ]
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then
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exit_error
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fi
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fi
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if [ -f ${libpcap_file} ]
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then
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echo ${libpcap_file} already downloaded! Nothing to do.
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else
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echo Download ${libpcap_file}...
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wget ${libpcap_link}
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if [ ! -f ${libpcap_file} ]
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then
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exit_error
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fi
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fi
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if [ -d ${tcpdump_dir} ]
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then
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echo ${tcpdump_dir} directory already exist! Nothing to do.
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else
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echo untar ${tcpdump_file}
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tar -zxf ${tcpdump_file}
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fi
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if [ -d ${libpcap_dir} ]
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then
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echo ${libpcap_dir} directory already exist! Nothing to do.
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else
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echo untar ${libpcap_file}
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tar -zxf ${libpcap_file}
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fi
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}
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# build libpcap
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{
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cd ${libpcap_dir}
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echo " _____________________"
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echo "| |"
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echo "| CONFIGURING LIBPCAP |"
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echo "|_____________________|"
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chmod +x configure
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./configure --host=arm-linux-androideabi --with-pcap=linux
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if [ $? -ne 0 ]
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then
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exit_error
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fi
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echo " __________________"
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echo "| |"
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echo "| BUILDING LIBPCAP |"
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echo "|__________________|"
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chmod +x runlex.sh
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make
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if [ $? -ne 0 ]
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then
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exit_error
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fi
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cd ..
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}
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# build tcpdump
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{
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cd ${tcpdump_dir}
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echo " _____________________"
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echo "| |"
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echo "| CONFIGURING TCPDUMP |"
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echo "|_____________________|"
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chmod +x configure
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./configure --host=arm-linux-androideabi --with-pcap=linux
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if [ $? -ne 0 ]
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then
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exit_error
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fi
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echo " __________________"
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echo "| |"
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echo "| BUILDING TCPDUMP |"
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echo "|__________________|"
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#setprotoent endprotoen not supported on android
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sed -i".bak" "s/setprotoent/\/\/setprotoent/g" print-isakmp.c
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sed -i".bak" "s/endprotoent/\/\/endprotoent/g" print-isakmp.c
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#NBBY is not defined => FORCE definition
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make #CFLAGS=-DNBBY=8 # for tcpdump < 4.2.1 (CFLAGS refefined in Makefile) => just make
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if [ $? -ne 0 ]
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then
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exit_error
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fi
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cd ..
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}
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mv ${tcpdump_dir}/tcpdump tcpdump-${toolchain_arch}
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chmod +x tcpdump-${toolchain_arch}
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echo " __________________"
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echo "| |"
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echo "| TCPDUMP IS READY |"
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echo "|__________________|"
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echo `pwd`/tcpdump-${toolchain_arch}

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