#
# Shorewall 5.0 -- /usr/share/shorewall/lib.base
#
#     (c) 1999-2015 - Tom Eastep (teastep@shorewall.net)
#
#	Complete documentation is available at http://shorewall.net
#
#       This program is part of Shorewall.
#
#	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, see <http://www.gnu.org/licenses/>.
#
# This library contains the code common to all Shorewall components except the
# generated scripts.
#

SHOREWALL_LIBVERSION=40509

[ -n "${g_program:=shorewall}" ]

if [ -z "$g_readrc" ]; then
    #
    # This is modified by the installer when ${SHAREDIR} != /usr/share
    #
    . /usr/share/shorewall/shorewallrc

    g_sharedir="$SHAREDIR"/$g_program
    g_confdir="$CONFDIR"/$g_program
    g_readrc=1
fi

g_basedir=${SHAREDIR}/shorewall

case $g_program in
    shorewall)
	g_product="Shorewall"
	g_family=4
	g_tool=iptables
	g_lite=
	;;
    shorewall6)
	g_product="Shorewall6"
	g_family=6
	g_tool=ip6tables
	g_lite=
	;;
    shorewall-lite)
	g_product="Shorewall Lite"
	g_family=4
	g_tool=iptables
	g_lite=Yes
	;;
    shorewall6-lite)
	g_product="Shorewall6 Lite"
	g_family=6
	g_tool=ip6tables
	g_lite=Yes
	;;
esac

if [ -z "${VARLIB}" ]; then
    VARLIB=${VARDIR}
    VARDIR=${VARLIB}/$g_program
elif [ -z "${VARDIR}" ]; then
    VARDIR="${VARLIB}/${PRODUCT}"
fi

#
# Fatal Error
#
fatal_error() # $@ = Message
{
    echo "   ERROR: $@" >&2
    exit 2
}

#
# Not configured Error
#
not_configured_error() # $@ = Message
{
    echo "   ERROR: $@" >&2
    exit 6
}

#
# Conditionally produce message
#
progress_message() # $* = Message
{
    local timestamp
    timestamp=

    if [ $VERBOSITY -gt 1 ]; then
	[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
	echo "${timestamp}$@"
    fi
}

progress_message2() # $* = Message
{
    local timestamp
    timestamp=

    if [ $VERBOSITY -gt 0 ]; then
	[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
	echo "${timestamp}$@"
    fi
}

progress_message3() # $* = Message
{
    local timestamp
    timestamp=

    if [ $VERBOSITY -ge 0 ]; then
	[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
	echo "${timestamp}$@"
    fi
}

#
# Undo the effect of 'separate_list()'
#
combine_list()
{
    local f
    local o
    o=

    for f in $* ; do
        o="${o:+$o,}$f"
    done

    echo $o
}

#
# Validate an IP address
#
valid_address() {
    local x
    local y
    local ifs
    ifs=$IFS

    IFS=.

    for x in $1; do
	case $x in
	    [0-9]|[0-9][0-9]|[1-2][0-9][0-9])
		[ $x -lt 256 ] || { IFS=$ifs; return 2; }
                ;;
	    *)
	        IFS=$ifs
		return 2
		;;
	esac
    done

    IFS=$ifs

    return 0
}

#
# Miserable Hack to work around broken BusyBox ash in OpenWRT
#
addr_comp() {
    test $(bc <<EOF
$1 > $2
EOF
) -eq 1

}

#
# Enumerate the members of an IP range -- When using a shell supporting only
# 32-bit signed arithmetic, the range cannot span 128.0.0.0.
#
# Comes in two flavors:
#
# ip_range() - produces a mimimal list of network/host addresses that spans
#              the range.
#
# ip_range_explicit() - explicitly enumerates the range.
#
ip_range() {
    local first
    local last
    local l
    local x
    local y
    local z
    local vlsm

    case $1 in
	!*)
	    #
	    # Let iptables complain if it's a range
	    #
	    echo $1
	    return
	    ;;
	[0-9]*.*.*.*-*.*.*.*)
            ;;
	*)
	    echo $1
	    return
	    ;;
    esac

    first=$(decodeaddr ${1%-*})
    last=$(decodeaddr ${1#*-})

    if addr_comp $first $last; then
	fatal_error "Invalid IP address range: $1"
    fi

    l=$(( $last + 1 ))

    while addr_comp $l $first; do
	vlsm=
	x=31
	y=2
	z=1

	while [ $(( $first % $y )) -eq 0 ] && ! addr_comp $(( $first + $y )) $l; do
	    vlsm=/$x
	    x=$(( $x - 1 ))
	    z=$y
	    y=$(( $y * 2 ))
	done

	echo $(encodeaddr $first)$vlsm
	first=$(($first + $z))
    done
}

ip_range_explicit() {
    local first
    local last

    case $1 in
    [0-9]*.*.*.*-*.*.*.*)
	;;
    *)
	echo $1
	return
	;;
    esac

    first=$(decodeaddr ${1%-*})
    last=$(decodeaddr ${1#*-})

    if addr_comp $first $last; then
	fatal_error "Invalid IP address range: $1"
    fi

    while ! addr_comp $first $last; do
	echo $(encodeaddr $first)
	first=$(($first + 1))
    done
}

[ -z "$LEFTSHIFT" ] && . ${g_basedir}/lib.common

#
# Netmask to VLSM
#
ip_vlsm() {
    local mask
    mask=$(decodeaddr $1)
    local vlsm
    vlsm=0
    local x
    x=$(( 128 << 24 )) # 0x80000000

    while [ $(( $x & $mask )) -ne 0 ]; do
	[ $mask -eq $x ] && mask=0 || mask=$(( $mask $LEFTSHIFT 1 )) # Not all shells shift 0x80000000 left properly.
	vlsm=$(($vlsm + 1))
    done

    if [ $(( $mask & 2147483647 )) -ne 0 ]; then # 2147483647 = 0x7fffffff
	echo "Invalid net mask: $1" >&2
    else
	echo $vlsm
    fi
}

#
# Set default config path
#
ensure_config_path() {
    local F
    F=${g_sharedir}/configpath
    if [ -z "$CONFIG_PATH" ]; then
	[ -f $F ] || { echo "   ERROR: $F does not exist"; exit 2; }
	. $F
    fi

    if [ -n "$g_shorewalldir" ]; then
	[ "${CONFIG_PATH%%:*}" = "$g_shorewalldir" ] || CONFIG_PATH=$g_shorewalldir:$CONFIG_PATH
    fi
}

#
# Get fully-qualified name of file
#
resolve_file() # $1 = file name
{
    local pwd
    pwd=$PWD

    case $1 in
	/*)
	    echo $1
	    ;;
	.)
	    echo $pwd
	    ;;
	./*)
	    echo ${pwd}${1#.}
	    ;;
	..)
	    cd ..
	    echo $PWD
	    cd $pwd
	    ;;
	../*)
	    cd ..
	    resolve_file ${1#../}
	    cd $pwd
	    ;;
	*)
	    echo $pwd/$1
	    ;;
    esac
}

#
# Determine how to do "echo -e"
#

find_echo() {
    local result

    result=$(echo "a\tb")
    [ ${#result} -eq 3 ] && { echo echo; return; }

    result=$(echo -e "a\tb")
    [ ${#result} -eq 3 ] && { echo "echo -e"; return; }

    result=$(which echo)
    [ -n "$result" ] && { echo "$result -e"; return; }

    echo echo
}

# Determine which version of mktemp is present (if any) and set MKTEMP accortingly:
#
#     None - No mktemp
#     BSD  - BSD mktemp (Mandrake)
#     STD  - mktemp.org mktemp
#
find_mktemp() {
    local mktemp
    mktemp=`mywhich mktemp 2> /dev/null`

    if [ -n "$mktemp" ]; then
	if qt mktemp -V ; then
	    MKTEMP=STD
	else
	    MKTEMP=BSD
	fi
    else
	MKTEMP=None
    fi
}

#
# create a temporary file. If a directory name is passed, the file will be created in
# that directory. Otherwise, it will be created in a temporary directory.
#
mktempfile() {

    [ -z "$MKTEMP" ] && find_mktemp

    if [ $# -gt 0 ]; then
	case "$MKTEMP" in
	    BSD)
		mktemp $1/shorewall.XXXXXX
		;;
	    STD)
		mktemp -p $1 shorewall.XXXXXX
		;;
	    None)
		> $1/shorewall-$$ && echo $1/shorewall-$$
		;;
	    *)
		error_message "ERROR:Internal error in mktempfile"
		;;
	esac
    else
	case "$MKTEMP" in
	    BSD)
		mktemp ${TMPDIR:-/tmp}/shorewall.XXXXXX
		;;
	    STD)
		mktemp -t shorewall.XXXXXX
		;;
	    None)
		rm -f ${TMPDIR:-/tmp}/shorewall-$$
		> ${TMPDIR:-}/shorewall-$$ && echo ${TMPDIR:-/tmp}/shorewall-$$
		;;
	    *)
		error_message "ERROR:Internal error in mktempfile"
		;;
	esac
    fi
}