build-tcpdump

#!/bin/bash

# --------------------------------------
#
#     Title: build-tcpdump
#    Author: Loic Poulain, loic.poulain@gmail.com
#
#   Purpose: download & build tcpdump for arm android platform
#
# You have to define your android NDK directory before calling this script
# example:
# $ export NDK=/home/Workspace/android-ndk-r10e
# $ sh build-tcpdump
#
# --------------------------------------

# default, edit versions
tcpdump_ver=4.7.4
libpcap_ver=1.7.4
android_api_def=21
toolchain=arm-linux-androideabi-4.9
ndk_dir_def=android-ndk-r10e

#-------------------------------------------------------#

tcpdump_dir=tcpdump-${tcpdump_ver}
libpcap_dir=libpcap-${libpcap_ver}


if [ ${NDK} ]
then
	ndk_dir=${NDK}
else
	ndk_dir=${ndk_dir_def}
fi

ndk_dir=`readlink -f ${ndk_dir}`

if [ ${ANDROID_API} ]
then
	android_api=${ANDROID_API}
else
	android_api=${android_api_def}
fi

echo "_______________________"
echo ""
echo "NDK - ${ndk_dir}"
echo "Android API: ${android_api}"
echo "_______________________"


exit_error()
{
	echo " _______"
	echo "|       |"
	echo "| ERROR |"
	echo "|_______|"
	exit 1
}

{
	if [ $# -ne 0 ]
	then
		if [ -d $1 ]
		then
			cd $1
		else
			echo directory $1 not found
			exit_error
		fi
	else
		mkdir tcpdumpbuild
		cd tcpdumpbuild
	fi
}



# create env
{
	echo " ____________________"
	echo "|                    |"
	echo "| CREATING TOOLCHAIN |"
	echo "|____________________|"

	if [ -d toolchain ]
	then
		echo Toolchain already exist! Nothing to do.
	else
		echo Creating toolchain...
		mkdir toolchain
		bash ${ndk_dir}/build/tools/make-standalone-toolchain.sh --toolchain=${toolchain} --platform=android-${android_api} --install-dir=toolchain
		
		if [ $? -ne 0 ]
		then
			rm -fr toolchain
			exit_error
		fi
	fi

	export CC=arm-linux-androideabi-gcc
        export CFLAGS="-fPIE -pie"
	export RANLIB=arm-linux-androideabi-ranlib
	export AR=arm-linux-androideabi-ar
	export LD=arm-linux-androideabi-ld
	export PATH=`pwd`/toolchain/bin:$PATH
}

# download & untar libpcap + tcpdump
{
	echo " _______________________________"
	echo "|                               |"
	echo "| DOWNLOADING LIBPCAP & TCPDUMP |"
	echo "|_______________________________|"
	
	tcpdump_file=${tcpdump_dir}.tar.gz
	libpcap_file=${libpcap_dir}.tar.gz
	tcpdump_link=http://www.tcpdump.org/release/${tcpdump_file}
	libpcap_link=http://www.tcpdump.org/release/${libpcap_file}
	
	if [ -f ${tcpdump_file} ]
	then
		echo ${tcpdump_file} already downloaded! Nothing to do.
	else
		echo Download ${tcpdump_file}...
		wget ${tcpdump_link}
		wget ${tcpdump_link}.sig
		if [ ! -f ${tcpdump_file} ]
		then
			exit_error
		fi
	fi

	gpg --verify ${tcpdump_file}.sig
	if [ $? -ne 0 ]
	then
		exit_error
	fi

	
	if [ -f ${libpcap_file} ]
	then
		echo ${libpcap_file} already downloaded! Nothing to do.
	else
		echo Download ${libpcap_file}...
		wget ${libpcap_link}
		wget ${libpcap_link}.sig
		if [ ! -f ${libpcap_file} ]
		then
			exit_error
		fi
	fi

	gpg --verify ${libpcap_file}.sig
	if [ $? -ne 0 ]
	then
		exit_error
	fi

	
	if [ -d ${tcpdump_dir} ]
	then
		echo ${tcpdump_dir} directory already exist! Nothing to do.
	else
		echo untar ${tcpdump_file}
		tar -zxf ${tcpdump_file}
	fi
	
	if [ -d ${libpcap_dir} ]
	then
		echo ${libpcap_dir} directory already exist! Nothing to do.
	else
		echo untar ${libpcap_file}
		tar -zxf ${libpcap_file}
	fi
}

# build libpcap
{
	cd ${libpcap_dir}

	echo " _____________________"
	echo "|                     |"
	echo "| CONFIGURING LIBPCAP |"
	echo "|_____________________|"

	chmod +x configure
	./configure --host=arm-linux --with-pcap=linux

	if [ $? -ne 0 ]
	then
		exit_error
	fi	

	echo " __________________"
	echo "|                  |"
	echo "| BUILDING LIBPCAP |"
	echo "|__________________|"

	chmod +x runlex.sh
	make

	if [ $? -ne 0 ]
	then
		exit_error
	fi

	cd ..
}

# build tcpdump
{
	cd ${tcpdump_dir}
	
	echo " _____________________"
	echo "|                     |"
	echo "| CONFIGURING TCPDUMP |"
	echo "|_____________________|"
	
	chmod +x configure
	./configure --host=arm-linux --with-pcap=linux

	if [ $? -ne 0 ]
	then
		exit_error
	fi	

	echo " __________________"
	echo "|                  |"
	echo "| BUILDING TCPDUMP |"
	echo "|__________________|"
	
	#setprotoent endprotoen not supported on android
	sed -i".bak" "s/setprotoent/\/\/setprotoent/g" print-isakmp.c
	sed -i".bak" "s/endprotoent/\/\/endprotoent/g" print-isakmp.c
	
	#NBBY is not defined => FORCE definition
	make CFLAGS=-DNBBY=8 # for tcpdump < 4.2.1 (CFLAGS refefined in Makefile) => just make
	
	if [ $? -ne 0 ]
	then
		exit_error
	fi
	
	cd ..
}

cp ${tcpdump_dir}/tcpdump .
chmod +x tcpdump

echo " __________________"
echo "|                  |"
echo "| TCPDUMP IS READY |"
echo "|__________________|"
echo `pwd`/tcpdump