#!/bin/bash

#+--------------------------------------------------------------------------------------------
#|Description:  This shell script used download and compile dropbear for ARM
#|     Author:  GuoWenxue <guowenxue@gmail.com>
#|  ChangeLog:
#|           1, Initialize 1.0.0 on 2011.04.12
#+--------------------------------------------------------------------------------------------

PREFIX_PATH=`pwd`/../install/

if [ -z $CROSSTOOL ] ; then
   CROSSTOOL=/opt/crosstool/cortex-a7/bin/arm-linux-gnueabi-
fi

function msg_banner()
{
    echo ""
    echo "+-----------------------------------------------------------------------"
    echo "|  $1 "
    echo "+-----------------------------------------------------------------------"
    echo ""
}

function check_result()
{
    if [ $? != 0 ] ; then
       echo ""
       echo "+-----------------------------------------------------------------------"
       echo "|  $1 "
       echo "+-----------------------------------------------------------------------"
       echo ""
       exit ;
    fi
}

function export_cross()
{
    # export cross toolchain
    export CC=${CROSSTOOL}gcc
    export AS=${CROSSTOOL}as
    export AR=${CROSSTOOL}ar
    export LD=${CROSSTOOL}ld
    export NM=${CROSSTOOL}nm
    export RANLIB=${CROSSTOOL}ranlib
    export OBJDUMP=${CROSSTOOL}objdump
    export STRIP=${CROSSTOOL}strip

    # export cross configure 
    export CONFIG_CROSS=" --build=i686-pc-linux --host=arm-linux "

    # Clear LDFLAGS and CFLAGS
    export LDFLAGS=
    export CFLAGS=
}

function compile_x86()
{
    # compile for X86 and generate Key
    msg_banner "Start compile $SRC_NAME for X86"
    make distclean
    ./configure && make
    ./dropbearkey -t rsa -f ${PREFIX_PATH}/dropbear_rsa_host_key
    chmod 644 ${PREFIX_PATH}/dropbear_rsa_host_key
    make distclean
}

function compile_dropbear()
{
    SRC_NAME=dropbear-2019.78
    PACK_SUFIX=tar.bz2

    if [ -f ${PREFIX_PATH}/dropbear ] ; then
        return 0;
    fi

    msg_banner "Start donwload $SRC_NAME "
    if [ ! -f ${SRC_NAME}.${PACK_SUFIX} ] ; then
        wget http://matt.ucc.asn.au/dropbear/releases/${SRC_NAME}.${PACK_SUFIX}
        check_result "ERROR: download ${SRC_NAME} failure"
    fi

    tar -xjf ${SRC_NAME}.${PACK_SUFIX}
    cd ${SRC_NAME}

    msg_banner "Start cross compile $SRC_NAME "

    ./configure --prefix=${PREFIX_PATH} ${CONFIG_CROSS} --disable-zlib
    check_result "ERROR: configure ${SRC_NAME} failure"

    make 
    check_result "ERROR: compile ${SRC_NAME} failure"

    ${STRIP} dbclient  dropbear
    cp dropbear ..
    cp dbclient ../ssh
    cp dbclient ${PREFIX_PATH}/bin/ssh
    cp dropbear ${PREFIX_PATH}/bin/

    cd -
}

function install_script()
{
    init_script=S20_dropbear
cat << EOF > ${init_script}
#!/bin/sh

mkdir -p /etc/dropbear/
dropbear -R
EOF

   chmod 755 ${init_script}

}

export_cross

compile_dropbear

install_script