#########################################################################
#
# Subroutine for the 'download' command
#
#########################################################################
#
# Copyright Rainer Wichmann (2005)
#
# License Information:
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#

commandDOWNLOAD() {
    printINFO "About to run \"$action\" for samhain version \"$src_version\""

    needEXE du gunzip tar gpg


    if test x"$simulate" = x0
    then
	cd "${basedir}/tmp" || printFATAL "could not cd to ${basedir}/tmp"
	rm -f "samhain-${src_version}.tar.gz"
    else
	# 
	# -- Simulate only: print what would be done
	#
	printINFO "cd ${basedir}/tmp"
	printINFO "rm -f samhain-${src_version}.tar.gz"
    fi

    command=""

    if test -z "$command"
    then
        findEXE wget
        if test -n "$EXECUTABLE"
        then
	    command="$EXECUTABLE"
	    opt1="--quiet"
	    opt2="-O"
	    opt3="-"
        fi
    fi

    if test -z "$command"
    then
        findEXE curl
        if test -n "$EXECUTABLE"
        then
	    command="$EXECUTABLE"
	    opt1="--silent"
	    opt2="--show-error"
	    opt3="--fail"
        fi
    fi

    if test -z "$command"
    then
	findEXE lynx
	if test -n "$EXECUTABLE"
	then
	    command="$EXECUTABLE"
	    opt1="-source"
	    opt2=""
	    opt3=""
	fi
    fi

    if test -z "$command"
    then
	findEXE links
	if test -n "$EXECUTABLE"
	then
	    command="$EXECUTABLE"
	    opt1="-source"
	    opt2=""
	    opt3=""
	fi
    fi

    if test -z "$command"
    then
	findEXE lwp-request
	if test -n "$EXECUTABLE"
	then
	    command="$EXECUTABLE"
	    opt1=""
	    opt2=""
	    opt3=""
	fi
    fi

    if test -z "$command"
    then
	findEXE fetch
	if test -n "$EXECUTABLE"
	then
	    command="$EXECUTABLE"
	    opt1="-q"
	    opt2="-o"
	    opt3="-"
	fi
    fi

    if test -z "$command"
    then
	findEXE fget
	if test -n "$EXECUTABLE"
	then
	    command="$EXECUTABLE"
	    opt1=""
	    opt2=""
	    opt3=""
	fi
    fi

    if test -z "$command"
    then
	printFATAL "No wget, curl, lynx, links, lwp-request, fetch, fget in your \$PATH, cannot download"
    fi

    if test x"${src_version}" = xcurrent
    then
	location="http://la-samhna.de/samhain/samhain-current.tar.gz"
	if test -f /usr/bin/md5sum && test -f /bin/hostname
	then
	    #
	    # for testing
	    #
	    dl_tmp_hna=`/bin/hostname -f 2>/dev/null`
	    dl_tmp_md5=`echo "x${dl_tmp_hna}" | md5sum`
	    if test x"$dl_tmp_md5" = "xc5f41bf28a7baf12c763f1be27a9b863"
	    then
		location="http://localhost/samhain-current.tar.gz"
	    fi
	fi
    else
	location="http://la-samhna.de/archive/samhain_signed-${src_version}.tar.gz"
	if test -f /usr/bin/md5sum && test -f /bin/hostname
	then
	    #
	    # for testing
	    #
	    dl_tmp_hna=`/bin/hostname -f 2>/dev/null`
	    dl_tmp_md5=`echo "x${dl_tmp_hna}" | /usr/bin/md5sum 2>/dev/null`
	    if test x"$dl_tmp_md5" = "xc5f41bf28a7baf12c763f1be27a9b863"
	    then
	    	location="http://localhost/samhain_signed-${src_version}.tar.gz"
	    fi
	fi
    fi


    printINFO "Executing $command $opt1 $opt2 $opt3 $location"

    if test x"$simulate" = x0
    then
	eval "$command" "$opt1" "$opt2" "$opt3" "$location" 1>"samhain-${src_version}.tar.gz" 2>/dev/null
    else
	printINFO "$command" "$opt1" "$opt2" "$opt3" "$location" 1>"samhain-${src_version}.tar.gz"
	printINFO "du -s -k samhain-${src_version}.tar.gz | awk '{ print $1 }'"
	printLOG  "Downloaded to samhain-${src_version}.tar.gz (XXX kB)"
	printINFO "gunzip -c samhain-${src_version}.tar.gz | tar -tvf - "
	printINFO "Source in tarball is version X.X.X"
	printINFO "Unpacking to ${tmpD}"
	printINFO "cd ${tmpD}"
	printINFO "gunzip -c ${basedir}/tmp/samhain-${src_version}.tar.gz | tar -xf -"
	printINFO "rm -f ${basedir}/tmp/samhain-${src_version}.tar.gz"
	printINFO "Checking PGP signature" 
	printINFO "(LANG=C; gpg --status-fd 1 --verify samhain-X.X.X.tar.gz.asc samhain-X.X.X.tar.gz 2>&1 | grep 'GOODSIG')"
	printINFO "cp samhain-X.X.X.tar.gz.asc samhain-X.X.X.tar.gz ${basedir}/source"
	printLOG "Installed samhain (X.X.X) source"
	return 0
    fi

    if test -f "samhain-${src_version}.tar.gz"
    then
	:
    else
	printFATAL "failed: $command $location"
    fi

    size=`du -s -k "samhain-${src_version}.tar.gz" | awk '{ print $1 }'`

    if test $size -lt 100
    then
	rm -f "samhain-${src_version}.tar.gz"
	printFATAL "failed: $command $location"
    else
	printLOG   "Downloaded to samhain-${src_version}.tar.gz (${size} kB)"
    fi

    files=`gunzip -c "samhain-${src_version}.tar.gz" | tar -tvf - 2>/dev/null`
    sig=`echo $files | egrep ' samhain.*tar\.gz\.asc$' 2>/dev/null`
    sig_version=`echo $files | egrep ' samhain.*tar\.gz\.asc$' 2>/dev/null | sed 's/.*samhain\-//g' | sed 's/\.tar\.gz\.asc//g'`
    if test x"$sig" = x
    then
	rm -f "samhain-${src_version}.tar.gz"
	printFATAL "downloaded file does not contain a PGP signature"
    fi

    if test x"${sig_version}" = x
    then
	rm -f "samhain-${src_version}.tar.gz"
	printFATAL "cannot determine samhain version from downloaded file"
    fi

    if test x"${src_version}" != xcurrent
    then
	if test x"${src_version}" != x"${sig_version}"
	then
	    rm -f "samhain-${src_version}.tar.gz"
	    printFATAL "downloaded version (${sig_version}) != requested version (${src_version})"
	fi
    fi

    printINFO "Source in tarball is version ${sig_version}"
    printINFO "Unpacking to ${basedir}/source"

    cd "${tmpD}" || { 
	rm -f "${basedir}/tmp/samhain-${src_version}.tar.gz"
	printFATAL "could not cd to ${tmpD}"
	}

    gunzip -c "${basedir}/tmp/samhain-${src_version}.tar.gz" | tar -xf - 

    rm -f "${basedir}/tmp/samhain-${src_version}.tar.gz"

    if test -f "samhain-${sig_version}.tar.gz"
    then
	if test -f "samhain-${sig_version}.tar.gz.asc"
	then
	    :
	else
	    printFATAL "not found in source: PGP signature samhain-${sig_version}.tar.gz.asc"
	fi
    else
	printFATAL "not found in source: samhain-${sig_version}.tar.gz"
    fi


    printINFO "Checking PGP signature" 
    sig_lines=`(LANG="C"; gpg --status-fd 1 --verify "samhain-${sig_version}.tar.gz.asc" "samhain-${sig_version}.tar.gz" 2>/dev/null)`
    sig_ok=`echo ${sig_lines} | grep 'GOODSIG'`

    sig_nokey=`echo ${sig_lines} | grep 'NO_PUBKEY'`

    if test x"${sig_nokey}" != x
    then
	printWARNING "Public key (ID 0F571F6C) not found, trying to import it."
	gpg --import ${basedir}/private/0F571F6C.asc 2>&5
	sig_ok=`(LANG="C"; gpg --status-fd 1 --verify "samhain-${sig_version}.tar.gz.asc" "samhain-${sig_version}.tar.gz" 2>/dev/null | grep 'GOODSIG')`
    fi

    if test x"${sig_ok}" = x
    then
	(LANG="C"; gpg --verify "samhain-${sig_version}.tar.gz.asc" "samhain-${sig_version}.tar.gz")
	printFATAL "no good signature"
    fi

    cp  "samhain-${sig_version}.tar.gz"  "samhain-${sig_version}.tar.gz.asc" \
	${basedir}/source/ || \
	printFATAL "failed: cp samhain-${sig_version}.tar.gz samhain-${sig_version}.tar.gz.asc ${basedir}/source/"
	      
    printLOG "Installed samhain source (version=${sig_version})"

    return 0
}