#!/bin/sh
#
#     Shorewall Lite Packet Filtering Firewall Control Program - V4.0
#
#     This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
#     (c) 2006 - Tom Eastep (teastep@shorewall.net)
#
#	This file should be placed in /sbin/shorewall-lite.
#
#	Shorewall documentation is available at http://shorewall.net
#
#	This program is free software; you can redistribute it and/or modify
#	it under the terms of Version 2 of the GNU General Public License
#	as published by the Free Software Foundation.
#
#	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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#     If an error occurs while starting or restarting the firewall, the
#     firewall is automatically stopped.
#
#     Commands are:
#
#     shorewall-lite dump                          Dumps all Shorewall-related information
#                                                  for problem analysis
#     shorewall-lite start 			   Starts the firewall
#     shorewall-lite restart			   Restarts the firewall
#     shorewall-lite stop			   Stops the firewall
#     shorewall-lite status			   Displays firewall status
#     shorewall-lite reset			   Resets iptables packet and
#						   byte counts
#     shorewall-lite clear			   Open the floodgates by
#						   removing all iptables rules
#						   and setting the three permanent
#						   chain policies to ACCEPT
#     shorewall-lite show <chain> [ <chain> ... ]  Display the rules in each <chain> listed
#     shorewall-lite show log			   Print the last 20 log messages
#     shorewall-lite show connections		   Show the kernel's connection
#						   tracking table
#     shorewall-lite show nat			   Display the rules in the nat table
#     shorewall-lite show {mangle|tos}		   Display the rules in the mangle table
#     shorewall-lite show tc			   Display traffic control info
#     shorewall-lite show classifiers		   Display classifiers
#     shorewall-lite show capabilities             Display iptables/kernel capabilities
#     shorewall-lite version			   Display the installed version id
#     shorewall-lite logwatch [ refresh-interval ] Monitor the local log for Shorewall
#						   messages.
#     shorewall-lite drop <address> ...		   Temporarily drop all packets from the
#						   listed address(es)
#     shorewall-lite reject <address> ...	   Temporarily reject all packets from the
#						   listed address(es)
#     shorewall-lite allow <address> ...	   Reenable address(es) previously
#						   disabled with "drop" or "reject"
#     shorewall-lite save [ <file> ]		   Save the list of "rejected" and
#						   "dropped" addresses so that it will
#						   be automatically reinstated the
#						   next time that Shorewall starts.
#                                                  Save the current state so that 'shorewall
#                                                  restore' can be used.
#
#     shorewall-lite forget [ <file> ]             Discard the data saved by 'shorewall save'
#
#     shorewall-lite restore [ <file> ]            Restore the state of the firewall from
#                                                  previously saved information.
#
#     shorewall-lite ipaddr { <address>/<cidr> | <address> <netmask> }
#
#                                                  Displays information about the network
#                                                  defined by the argument[s]
#
#     shorewall-lite iprange <address>-<address>   Decomposes a range of IP addresses into
#                                                  a list of network/host addresses.
#
#     shorewall-lite ipdecimal { <address> | <integer> }
#
#                                                  Displays the decimal equivalent of an IP
#                                                  address and vice versa.

#
# Set the configuration variables from shorewall-lite.conf
#
get_config() {

    [ -n "$PATH" ] || PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin

    [ -z "$LOGFILE" ] && LOGFILE=/var/log/messages

    if ( ps ax 2> /dev/null | grep -v grep |  qt grep 'syslogd.*-C' ) ; then
	LOGREAD="logread | tac"
    elif [ -f $LOGFILE ]; then
	LOGREAD="tac $LOGFILE"
    else
	echo "LOGFILE ($LOGFILE) does not exist!" >&2
	exit 2
    fi
    #
    # See if we have a real version of "tail" -- use separate redirection so
    # that ash (aka /bin/sh on LRP) doesn't crap
    #
    if ( tail -n5 /dev/null > /dev/null 2> /dev/null ) ; then
	realtail="Yes"
    else
	realtail=""
    fi

    [ -n "$FW" ] || FW=fw

    [ -n "LOGFORMAT" ] && LOGFORMAT="${LOGFORMAT%%%*}"

    [ -n "$LOGFORMAT" ] || LOGFORMAT="Shorewall:"

    export LOGFORMAT

    if [ -n "$IPTABLES" ]; then
	if [ ! -x "$IPTABLES" ]; then
	    echo "   ERROR: The program specified in IPTABLES does not exist or is not executable" >&2
	    exit 2
	fi
    else
	IPTABLES=$(mywhich iptables 2> /dev/null)
	if [ -z "$IPTABLES" ] ; then
	    echo "   ERROR: Can't find iptables executable" >&2
	    exit 2
	fi
    fi

    export IPTABLES

    if [ -n "$SHOREWALL_SHELL" ]; then
	if [ ! -x "$SHOREWALL_SHELL" ]; then
	    echo "   ERROR: The program specified in SHOREWALL_SHELL does not exist or is not executable" >&2
	    exit 2
	fi
    fi

    [ -n "$RESTOREFILE" ] || RESTOREFILE=restore

    validate_restorefile RESTOREFILE

    export RESTOREFILE

    [ -n "${VERBOSITY:=2}" ]

    VERBOSE=$(($VERBOSE_OFFSET + $VERBOSITY))

    export VERBOSE

    [ -n "${HOSTNAME:=$(hostname)}" ]

}

#
# Verify that we have a compiled firewall script
#
verify_firewall_script() {
    if [ ! -f $FIREWALL ]; then
	echo "   ERROR: Shorewall Lite is not properly installed" >&2
	if [ -L $FIREWALL ]; then
	    echo "          $FIREWALL is a symbolic link to a" >&2
	    echo "          non-existant file" >&2
	else
	    echo "          The file $FIREWALL does not exist" >&2
	fi
	
	exit 2
    fi
}

#
# Start Command Executor
#
start_command() {
    local finished=0

    do_it() {
	local rc=0
	[ -n "$nolock" ] || mutex_on

	if [ -x ${LITEDIR}/firewall ]; then
	    ${LITEDIR}/firewall $debugging start
	    rc=$?
	else
	    error_message "${LITEDIR}/firewall is missing or is not executable"
	    logger -p kern.err "ERROR:Shorewall Lite start failed"
	    rc=2
	fi

	[ -n "$nolock" ] || mutex_off
	exit $rc
    }

    verify_firewall_script

    if shorewall_is_started; then
	error_message "Shorewall is already running"
	exit 0
    fi

    while [ $finished -eq 0 -a $# -gt 0 ]; do
	option=$1
	case $option in
	    -*)
		option=${option#-}

		while [ -n "$option" ]; do
		    case $option in
			-)
			    finished=1
			    option=
			    ;;
			f*)
			    FAST=Yes
			    option=${option#f}
			    ;;
			*)
			    usage 1
			    ;;
		    esac
		done
		shift
		;;
	    *)
		finished=1
		;;
	esac
    done

    case $# in
	0)
	    ;;
	*)
	    usage 1
	    ;;
    esac

    export NOROUTES

    if [ -n "$FAST" ]; then
	if qt mywhich make; then
	    #
	    # RESTOREFILE is exported by get_config()
	    #
	    make -qf ${CONFDIR}/Makefile || FAST=
	fi

	if [ -n "$FAST" ]; then

	    RESTOREPATH=${VARDIR}/$RESTOREFILE

	    if [ -x $RESTOREPATH ]; then
		if [ -x ${RESTOREPATH}-ipsets ]; then
		    echo Restoring Ipsets...
		    #
		    # We must purge iptables to be sure that there are no
		    # references to ipsets
		    #
		    iptables -F
		    iptables -X
		    $SHOREWALL_SHELL ${RESTOREPATH}-ipsets
		fi

		echo Restoring Shorewall Lite...
		$SHOREWALL_SHELL $RESTOREPATH restore
		date > ${VARDIR}/restarted
		progress_message3 Shorewall Lite restored from $RESTOREPATH
	    else
		do_it
	    fi
	else
	    do_it
	fi
    else
	do_it
    fi
}

#
# Restart Command Executor
#
restart_command() {
    local finished=0 rc=0

    verify_firewall_script

    while [ $finished -eq 0 -a $# -gt 0 ]; do
	option=$1
	case $option in
	    -*)
		option=${option#-}

		while [ -n "$option" ]; do
		    case $option in
			-)
			    finished=1
			    option=
			    ;;
			n*)
			    NOROUTES=Yes
			    option=${option#n}
			    ;;
			*)
			    usage 1
			    ;;
		    esac
		done
		shift
		;;
	    *)
		finished=1
		;;
	esac
    done

    case $# in
	0)
	    ;;
	*)
	    usage 1
	    ;;
    esac

    export NOROUTES

    [ -n "$nolock" ] || mutex_on

    if [ -x ${LITEDIR}/firewall ]; then
	$SHOREWALL_SHELL ${LITEDIR}/firewall $debugging restart
	rc=$?
    else
	error_message "${LITEDIR}/firewall is missing or is not executable"
	logger -p kern.err "ERROR:Shorewall Lite restart failed"
	rc=2
    fi

    [ -n "$nolock" ] || mutex_off
    return $rc
}

#
# Give Usage Information
#
usage() # $1 = exit status
{
    echo "Usage: $(basename $0) [debug|trace] [nolock] [ -q ] [ -v ] [ -t ] <command>"
    echo "where <command> is one of:"
    echo "   allow <address> ..."
    echo "   clear"
    echo "   drop <address> ..."
    echo "   dump [ -x ]"
    echo "   forget [ <file name> ]"
    echo "   help"
    echo "   hits"
    echo "   ipcalc { <address>/<vlsm> | <address> <netmask> }"
    echo "   ipdecimal { <address> | <integer> }"
    echo "   iprange <address>-<address>"
    echo "   logdrop <address> ..."
    echo "   logreject <address> ..."
    echo "   logwatch [<refresh interval>]"
    echo "   reject <address> ..."
    echo "   reset"
    echo "   restart [ -n ]"
    echo "   restore [ -n ] [ <file name> ]"
    echo "   save [ <file name> ]"
    echo "   show [ -x ] [ -m ] [ -f ] [ -t {filter|mangle|nat} ] [ {chain [<chain> [ <chain> ... ]|capabilities|classifiers|config|connections|ip|log|mangle|nat|routing|tc|zones} ]"
    echo "   start [ -f ] [ -n ]"
    echo "   stop"
    echo "   status"
    echo "   version"
    echo
    exit $1
}

#
# Execution begins here
#
debugging=

if [ $# -gt 0 ] && [ "$1" = "debug" -o "$1" = "trace" ]; then
    debugging=$1
    shift
fi

nolock=

if [ $# -gt 0 ] && [ "$1" = "nolock" ]; then
    nolock=nolock
    shift
fi

IPT_OPTIONS="-nv"
FAST=
VERBOSE_OFFSET=0
NOROUTES=
EXPORT=
export TIMESTAMP=
noroutes=

finished=0

while [ $finished -eq 0 ]; do
    [ $# -eq 0 ] && usage 1
    option=$1
    case $option in
	-)
	    finished=1
	    ;;
	-*)
	    option=${option#-}

	    [ -z "$option" ] && usage 1

	    while [ -n "$option" ]; do
		case $option in
		    x*)
			IPT_OPTIONS="-xnv"
			option=${option#x}
			;;
		    q*)
			VERBOSE_OFFSET=$(($VERBOSE_OFFSET - 1 ))
			option=${option#q}
			;;
		    f*)
			FAST=Yes
			option=${option#f}
			;;
		    v*)
			VERBOSE_OFFSET=$(($VERBOSE_OFFSET + 1 ))
			option=${option#v}
			;;
		    n*)
			NOROUTES=Yes
			option=${option#n}
			;;
		    t*)
			TIMESTAMP=Yes
			option=${option#t}
			;;
		    -)
			finished=1
			option=
			;;
		    *)
			usage 1
			;;
		esac
	    done
	    shift
	    ;;
	*)
	    finished=1
            ;;
    esac
done

if [ $# -eq 0 ]; then
    usage 1
fi

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
MUTEX_TIMEOUT=

SHAREDIR=/usr/share/shorewall-lite
CONFDIR=/etc/shorewall-lite
export PRODUCT="Shorewall Lite"

[ -f ${CONFDIR}/vardir ] && . ${CONFDIR}/vardir ]

[ -n "${VARDIR:=/var/lib/shorewall-lite}" ]

[ -d $VARDIR ] || mkdir -p $VARDIR || fatal_error "Unable to create $VARDIR"

LIBRARIES="$SHAREDIR/lib.base $SHAREDIR/lib.cli"
VERSION_FILE=$SHAREDIR/version
HELP=$SHAREDIR/help

for library in $LIBRARIES; do
    if [ -f $library ]; then
	. $library
    else
	echo "Installation error: $library does not exist!" >&2
	exit 2
    fi
done

ensure_config_path

config=$(find_file shorewall-lite.conf)

if [ -f $config ]; then
    if [ -r $config ]; then
	. $config
    else
	echo "Cannot read $config! (Hint: Are you root?)" >&2
	exit 1
    fi
else
    echo "$config does not exist!" >&2
    exit 2
fi

ensure_config_path
export CONFIG_PATH

LITEDIR=${VARDIR}

[ -f ${LITEDIR}/firewall.conf ] && . ${LITEDIR}/firewall.conf

get_config

FIREWALL=$LITEDIR/firewall

if [ -f $VERSION_FILE ]; then
    version=$(cat $VERSION_FILE)
else
    echo "   ERROR: Shorewall Lite is not properly installed" >&2
    echo "          The file $VERSION_FILE does not exist" >&2
    exit 1
fi

banner="Shorewall Lite $version Status at $HOSTNAME -"

case $(echo -e) in
    -e*)
	RING_BELL="echo \a"
	;;
    *)
	RING_BELL="echo -e \a"
	;;
esac

case $(echo -n "Testing") in
    -n*)
	ECHO_N=
	;;
    *)
	ECHO_N=-n
	;;
esac

COMMAND=$1

case "$COMMAND" in
    start)
	shift
	start_command $@
	;;
    stop|reset|clear)
	[ $# -ne 1 ] && usage 1
	verify_firewall_script
	export NOROUTES
	exec $SHOREWALL_SHELL $FIREWALL $debugging $nolock $COMMAND
	;;
    restart)
	shift
	restart_command $@
	;;
    show|list)
    	shift
    	show_command $@
	;;
    status)
	[ $# -eq 1 ] || usage 1
	echo "Shorewall Lite $version Status at $HOSTNAME - $(date)"
	echo
	if shorewall_is_started ; then
	    echo "Shorewall Lite is running"
	    status=0
	else
	    echo "Shorewall Lite is stopped"
	    status=4
	fi

	if [ -f ${VARDIR}/state ]; then
	    state="$(cat ${VARDIR}/state)"
	    case $state in
		Stopped*|Clear*)
		    status=3
		    ;;
	    esac
	else
	    state=Unknown
	fi
	echo "State:$state"
	echo
	exit $status
	;;
    dump)
    	shift
    	dump_command $@
	;;
    hits)
	[ -n "$debugging" ] && set -x
	[ $# -eq 1 ] || usage 1
	hits_command
	;;
    version)
	echo $version Lite
	;;
    logwatch)
	logwatch_command $@
	;;
    drop)
	[ -n "$debugging" ] && set -x
	[ $# -eq 1 ] && usage 1
	if shorewall_is_started ; then
	    [ -n "$nolock" ] || mutex_on
	    block DROP Dropped $*
	    [ -n "$nolock" ] || mutex_off
	else
	    error_message "ERROR: Shorewall Lite is not started"
	    exit 2
	fi
	;;
    logdrop)
	[ -n "$debugging" ] && set -x
	[ $# -eq 1 ] && usage 1
	if shorewall_is_started ; then
	    [ -n "$nolock" ] || mutex_on
	    block logdrop Dropped $*
	    [ -n "$nolock" ] || mutex_off
	else
	    error_message "ERROR: Shorewall Lite is not started"
	    exit 2
	fi
	;;
    reject|logreject)
	[ -n "$debugging" ] && set -x
	[ $# -eq 1 ] && usage 1
	if shorewall_is_started ; then
	    [ -n "$nolock" ] || mutex_on
	    block $COMMAND Rejected $*
	    [ -n "$nolock" ] || mutex_off
	else
	    error_message "ERROR: Shorewall Lite is not started"
	    exit 2
	fi
	;;
    allow)
	allow_command $@
	;;
    save)
	[ -n "$debugging" ] && set -x

	case $# in
	1)
	    ;;
	2)
	    RESTOREFILE="$2"
	    validate_restorefile '<restore file>'
	    ;;
	*)
	    usage 1
	    ;;
	esac

	RESTOREPATH=${VARDIR}/$RESTOREFILE

	[ "$nolock" ] || mutex_on

	save_config

	[ "$nolock" ] || mutex_off
	;;
    forget)
	case $# in
	1)
	    ;;
	2)
	    RESTOREFILE="$2"
	    validate_restorefile '<restore file>'
	    ;;
	*)
	    usage 1
	    ;;
	esac


	RESTOREPATH=${VARDIR}/$RESTOREFILE

	if [ -x $RESTOREPATH ]; then

	    if [ -x ${RESTOREPATH}-ipsets ]; then
		rm -f ${RESTOREPATH}-ipsets
		echo "    ${RESTOREPATH}-ipsets removed"
	    fi

	    rm -f $RESTOREPATH
	    rm -f ${RESTOREPATH}-iptables
	    echo "    $RESTOREPATH removed"
	elif [ -f $RESTOREPATH ]; then
	    echo "   $RESTOREPATH exists and is not a saved Shorewall configuration"
	fi
	rm -f ${VARDIR}/save
	;;
    ipcalc)
    	[ -n "$debugging" ] && set -x
	if [ $# -eq 2 ]; then
	    address=${2%/*}
	    vlsm=${2#*/}
	elif [ $# -eq 3 ]; then
	    address=$2
	    vlsm=$(ip_vlsm $3)
	else
	    usage 1
	fi

	valid_address $address || fatal_error "Invalid IP address: $address"
	[ -z "$vlsm" ] && exit 2
	[ "x$address" = "x$vlsm" ] && usage 2
	[ $vlsm -gt 32 ] && echo "Invalid VLSM: /$vlsm" >&2 && exit 2

	address=$address/$vlsm

	                                   echo "   CIDR=$address"
	temp=$(ip_netmask $address);       echo "   NETMASK=$(encodeaddr $temp)"
	temp=$(ip_network $address);       echo "   NETWORK=$temp"
	temp=$(broadcastaddress $address); echo "   BROADCAST=$temp"
	;;

    iprange)
	[ -n "$debugging" ] && set -x
	case $2 in
	    *.*.*.*-*.*.*.*)
		for address in ${2%-*} ${2#*-}; do
		    valid_address $address || fatal_error "Invalid IP address: $address"
		done

		ip_range $2
		;;
	    *)
		usage 1
		;;
	esac
	;;
    ipdecimal)
	[ -n "$debugging" ] && set -x
	[ $# -eq 2 ] || usage 1
	case $2 in
	    *.*.*.*)
		valid_address $2 || fatal_error "Invalid IP address: $2"
		echo "   $(decodeaddr $2)"
		;;
	    *)
		echo "   $(encodeaddr $2)"
		;;
	esac
	;;
    restore)
	shift
	STARTUP_ENABLED=Yes
	restore_command $@
        ;;
    call)
	[ -n "$debugging" ] && set -x
	#
	# Undocumented way to call functions in ${SHAREDIR}/functions directly
	#
	shift
	$@
	;;
    help)
	shift
	usage
	;;
    *)
	usage 1
	;;

esac