shorewall_code/Shorewall-common/lib.config

#!/bin/sh
#
# Shorewall 4.2 -- /usr/share/shorewall/lib.config
#
#     This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
#     (c) 1999,2000,2001,2002,2003,2004,2005,2006,2007 - Tom Eastep (teastep@shorewall.net)
#
#	Complete 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.
#
# This library contains the configuration file parsing code common to
# /usr/share/shorewall/compiler and /usr/share/shorewall/firewall
#

SHOREWALL_CONFIGVERSION=40000

#
# Replace commas with spaces and echo the result
#
separate_list() {
    local list
    list="$@"
    local part
    local newlist
    local firstpart
    local lastpart
    local enclosure

    case "$list" in
	*,|,*|*,,*|*[[:space:]]*)
	    #
	    # There's been whining about us not catching embedded white space in
	    # comma-separated lists. This is an attempt to snag some of the cases.
	    #
	    # The 'TERMINATOR' function will be set by the 'firewall' script to
	    # either 'startup_error' or 'fatal_error' depending on the command and
	    # command phase
	    #
            [ -n "$TERMINATOR" ] && \
		$TERMINATOR "Invalid comma-separated list \"$@\""
            echo "WARNING -- invalid comma-separated list \"$@\"" >&2
	    ;;
	*\[*\]*)
	    #
	    # Where we need to embed comma-separated lists within lists, we enclose them
	    # within square brackets.
	    #
	    firstpart=${list%%\[*}
	    lastpart=${list#*\[}
	    enclosure=${lastpart%%\]*}
	    lastpart=${lastpart#*\]}
	    case $lastpart in
		\,*)
		    case $firstpart in
			*\,)
			    echo "$(separate_list ${firstpart%,}) [$enclosure] $(separate_list ${lastpart#,})"
			    ;;
			*)
			    echo "$(separate_list $firstpart)[$enclosure] $(separate_list ${lastpart#,})"
			    ;;
		    esac
		    ;;
		*)
		    case $firstpart in
			*\,)
			    echo "$(separate_list ${firstpart%,}) [$enclosure]$(separate_list $lastpart)"
			    ;;
			*)
			    echo "$(separate_list $firstpart)[$enclosure]$(separate_list $lastpart)"
			    ;;
		    esac
		    ;;
	    esac
	    return
	    ;;
    esac

    list="$@"
    part="${list%%,*}"
    newlist="$part"

    while [ "x$part" != "x$list" ]; do
	list="${list#*,}";
	part="${list%%,*}";
	newlist="$newlist $part";
    done

    echo "$newlist"
}

#
# Display elements of a list with leading white space
#
display_list() # $1 = List Title, rest of $* = list to display
{
    [ $# -gt 1 ] && echo "   $*"
}

#
# Determine if a chain is a policy chain
#
is_policy_chain() # $1 = name of chain
{
    eval test \"\$${1}_is_policy\" = Yes
}

#
# Return a space separated list of values matching
#
list_walk() # $1 = element to search for, $2-$n = list
{
    local e
    e=$1
    local result
    result=

    while [ $# -gt 1 ]; do
	shift
	case $1 in
	    $e*)
	    	result="$result ${1##$e}"
		;;
	esac
    done
    echo $result
}

#
# Functions to count list elements
# - - - - - - - - - - - - - - - -
# Whitespace-separated list
#
list_count1() {
    echo $#
}
#
# Comma-separated list
#
list_count() {
    list_count1 $(separate_list $1)
}

#
# Filter that expands variables
#
expand_line() {
    local line

    while read line; do
	echo $(expand $line)
    done
}

#
# Add whitespace after leading "!"
#
fix_bang()
{
    local result
    result=

    while [ $# -gt 0 ]; do
	case $1 in
	    !*)
		result="$result ! ${1#!}"
		;;
	    *)
		result="$result $1"
		;;
	esac
	shift
    done

    echo $result
}

#
# Read the zones file and find the firewall zone
#
get_firewall_zone() {
    local zone
    local type
    local rest
    local comment
    comment='#*'
    local f
    f=$(find_file zones)

    [ -f $f ] || startup_error "Unable to find zones file"

    while read zone type rest; do
	case $zone in
	    $comment)
                ;;
	    *)
	        if [ "x$type" = xfirewall ]; then
		    FW=$zone
		    return
		fi
		;;
	esac
    done < $f

    startup_error "No firewall zone defined in $f"
}

#
# This function assumes that the TMP_DIR variable is set and that
# its value names an existing directory.
#
determine_zones()
{
    local zone
    local parent
    local parents
    local rest
    local new_zone_file
    new_zone_file=
    local r

    merge_zone()
    {
	local z
	local zones
	zones="$ZONES"
	local merged
	merged=

	if [ -n "$parents" ]; then
	    ZONES=
	    for z in $zones; do
		if [ -z "$merged" ] && list_search $z $parents; then
		    ZONES="$ZONES $zone"
		    merged=Yes
		fi
		ZONES="$ZONES $z"
	    done
	else
	    ZONES="$ZONES $zone"
	fi
    }

    ZONES=
    IPV4_ZONES=
    IPSEC_ZONES=

    [ "$IPSECFILE" = zones ] && new_zone_file=Yes || test -n "${FW:=fw}"

    while read zone type rest; do
	case $zone in
	    *:*)
		parents=${zone#*:}
		zone=${zone%:*}
		[ -n "$zone" ] || startup_error "Invalid nested zone syntax: :$parents"
		parents=$(separate_list $parents)
		eval ${zone}_parents=\"$parents\"
		;;
	    *)
		parents=
		eval ${zone}_parents=
		;;
	esac

	for parent in $parents; do
	    [ "$parent" = "$FW" ] && startup_error "Sub-zones of the firewall zone are not allowed"
	    list_search $parent $ZONES || startup_error "Parent zone not defined: $parent"
	done

	[ ${#zone} -gt $MAXZONENAMELENGTH ] && startup_error "Zone name longer than $MAXZONENAMELENGTH characters: $zone"

	case "$zone" in
	    [0-9*])
                startup_error "Illegal zone name \"$zone\" in zones file"
		;;
            all|none|SOURCE|DEST)
	        startup_error "Reserved zone name \"$zone\" in zones file"
		;;
        esac

	if [ -n "$new_zone_file" ]; then
	    case ${type:=ipv4} in
		ipv4|IPv4|IPV4|plain|-)
		    list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
		    merge_zone
		    IPV4_ZONES="$IPV4_ZONES $zone"
		    ;;
		ipsec|IPSEC|ipsec4|IPSEC4)
		    list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
		    [ -n "$POLICY_MATCH" ] || startup_error "Your kernel and/or iptables does not support policy match"
		    eval ${zone}_is_ipsec=Yes
		    eval ${zone}_is_complex=Yes
		    merge_zone
		    IPSEC_ZONES="$IPSEC_ZONES $zone"
		    ;;
		firewall)
		    [ -n "$FW" ] && startup_error "Only one firewall zone may be defined"
		    list_search $zone $ZONES && startup_error "Zone $zone is defined more than once"
		    [ -n "$parents" ] && startup_error "The firewall zone may not be nested"
		    for r in $rest; do
			[ "x$r" = x- ] || startup_error "OPTIONS not allowed on the firewall zone"
		    done
		    FW=$zone
		    ;;
		bport|bport4)
		    [ "$PROGRAM" = compiler ] && startup_error "Invalid Zone Type: $type"
		    list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
		    merge_zone
		    BRIDGING=Yes
		    ;;
		*)
		    startup_error "Invalid Zone Type: $type"
		    ;;
	    esac

	    eval ${zone}_type=$type
	else
	    list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
	    ZONES="$ZONES $zone"
	    IPV4_ZONES="$IPV4_ZONES $zone"
	    eval ${zone}_type=ipv4
	fi
    done < $TMP_DIR/zones

    [ -z "$ZONES" ] && startup_error "No ipv4 or ipsec Zones Defined"

    [ -z "$FW" ] && startup_error "No Firewall Zone Defined"
}

#
# Validate the zone names and options in the interfaces file
#
validate_interfaces_file() {
    local wildcard
    local found_obsolete_option
    found_obsolete_option=
    local z
    local interface
    local networks
    local options
    local r
    local iface
    local option

    while read z interface networks options; do
	r="$z $interface $networks $options"

	[ "x$z" = "x-" ] && z=

	if [ -n "$z" ]; then
	    validate_zone $z || startup_error "Invalid zone ($z) in record \"$r\""
	fi

	list_search $interface $ALL_INTERFACES && \
	    startup_error "Duplicate Interface $interface"

	wildcard=

	case $interface in
	    *:*)
		if [ "$PROGRAM" != compiler ]; then
		    #
		    # Assume that this is 4.0 syntax for a bridge
		    #
		    local bridge
		    bridge=${interface%:*}
		    list_search $bridge $ALL_INTERFACES || startup_error "Unknown Interface: $bridge"  
		    interface=${interface#*:}
		else 
		    startup_error "Invalid Interface Name: $interface"
		fi
		;;
	    +)
		startup_error "Invalid Interface Name: +"
		;;
	    *+)
		wildcard=Yes
		;;
	esac

	ALL_INTERFACES="$ALL_INTERFACES $interface"
	options=$(separate_list $options)
	iface=$(chain_base $interface)

	eval ${iface}_broadcast="$networks"
	eval ${iface}_zone="$z"
	eval ${iface}_options=\"$options\"

	for option in $options; do
	    case $option in
		-)
		    ;;
		dhcp|tcpflags|arp_filter|routefilter|logmartians|sourceroute|blacklist|nosmurfs|upnp|-)
		    ;;
		proxyarp)
		    [ "$PROGRAM" = compiler ] && lib_load proxyarp "The 'proxyarp' option on interface $interface"
		    ;;
		maclist)
		    [ "$PROGRAM" = compiler ] && lib_load maclist "The 'maclist' option"
		    ;;
		norfc1918)
		    if [ "$PROGRAM" != compiler ]; then
			addr=$(ip -f inet addr show $interface 2> /dev/null | grep inet | head -n1)
			if [ -n "$addr" ]; then
			    addr=$(echo $addr | sed 's/inet //;s/\/.*//;s/ peer.*//')
			    for network in 10.0.0.0/8 176.16.0.0/12 192.168.0.0/16; do
				if in_network $addr $network; then
				    startup_error "The 'norfc1918' option may not be specified on an interface with an RFC 1918 address. Interface:$interface"
				fi
			    done
			fi
		    fi
		    ;;
		arp_ignore=*)
		    eval ${iface}_arp_ignore=${option#*=}
		    ;;
		arp_ignore)
		    eval ${iface}_arp_ignore=1
		    ;;
		detectnets)
		    [ -n "$wildcard" ] && \
			startup_error "The \"detectnets\" option may not be used with a wild-card interface"
		    [ -n "$EXPORT" ] && \
			startup_error "'detectnets' not permitted with the -e run-line option"
		    ;;
		routeback)
		    [ -n "$z" ] || startup_error "The routeback option may not be specified on a multi-zone interface"
		    ;;
		*)
		    [ $PROGRAM = compiler ] && error_message "WARNING: Invalid option ($option) in record \"$r\""
		    ;;
	    esac
	done
    done < $TMP_DIR/interfaces

    [ -z "$ALL_INTERFACES" ] && startup_error "No Interfaces Defined"
}

#
# Process the ipsec information in the zones file
#
setup_ipsec() {
    local zone
    local using_ipsec
    using_ipsec=
    #
    # Add a --set-mss rule to the passed chain
    #
    set_mss1() # $1 = chain, $2 = MSS
    {
	local policy
	eval policy=\$${1}_policy

	if [ "$policy" != NONE ]; then
	    ensurechain $1
	    local match
	    match=
	    [ "$TCPMSS_MATCH" ] && match="-m tcpmss --mss $2: "
	    run_iptables -I $1 -p tcp --tcp-flags SYN,RST SYN ${match}-j TCPMSS --set-mss $2
	fi
    }
    #
    # Set up rules to set MSS to and/or from zone "$zone"
    #
    set_mss() # $1 = MSS value, $2 = _in, _out or ""
    {
	for z in $ZONES $FW; do
	    case $2 in
		_in)
		    set_mss1 ${zone}2${z} $1
		    ;;
		_out)
		    set_mss1 ${z}2${zone} $1
		    ;;
		*)
		    set_mss1 ${z}2${zone} $1
		    set_mss1 ${zone}2${z} $1
		    ;;
	    esac
	done
    }

    do_options() # $1 = _in, _out or "" - $2 = option list
    {
	local option
	local newoptions
	newoptions=
	local val

	[ x${2} = x- ] && return

	for option in $(separate_list $2); do
	    val=${option#*=}

	    case $option in
		mss=[0-9]*)    [ "$PROGRAM" = compiler ] && set_mss $val $1 ;;
		strict)        newoptions="$newoptions --strict" ;;
		next)          newoptions="$newoptions --next" ;;
		reqid=*)       newoptions="$newoptions --reqid $val" ;;
		spi=*)         newoptions="$newoptions --spi $val" ;;
		proto=*)       newoptions="$newoptions --proto $val" ;;
		mode=*)        newoptions="$newoptions --mode $val" ;;
		tunnel-src=*)  newoptions="$newoptions --tunnel-src $val" ;;
		tunnel-dst=*)  newoptions="$newoptions --tunnel-dst $val" ;;
		reqid!=*)      newoptions="$newoptions ! --reqid $val" ;;
		spi!=*)        newoptions="$newoptions ! --spi $val" ;;
		proto!=*)      newoptions="$newoptions ! --proto $val" ;;
		mode!=*)       newoptions="$newoptions ! --mode $val" ;;
		tunnel-src!=*) newoptions="$newoptions ! --tunnel-src $val" ;;
		tunnel-dst!=*) newoptions="$newoptions ! --tunnel-dst $val" ;;
		*)             fatal_error "Invalid option \"$option\" for zone $zone" ;;
	    esac
	done

	if [ -n "$newoptions" ]; then
	    [ -n "$POLICY_MATCH" ] || fatal_error "Your kernel and/or iptables does not support policy match"
	    eval ${zone}_is_complex=Yes
	    eval ${zone}_ipsec${1}_options=\"${newoptions# }\"
	fi
    }

    case $IPSECFILE in
	zones)
	    f=zones
	    progress_message "$DOING IPSEC..."
	    [ $PROGRAM = compiler -a -n "$IPSEC_ZONES" ] && save_progress_message "Setting up IPSEC management..."
	    ;;
	ipsec)
	    using_ipsec=Yes
	    if [ -s ${TMP_DIR}/ipsec ]; then
		progress_message "$DOING ipsec..."
		[ $PROGRAM = compiler ] && save_progress_message "Setting up IPSEC management..."
		f=ipsec
	    else
		return
	    fi
	    ;;
    esac

    while read zone type options in_options out_options mss; do
	if [ -n "$using_ipsec" ]; then
	    validate_zone1 $zone || fatal_error "Unknown zone: $zone"
	fi

	if [ -n "$type" ]; then
	    if [ -n "$using_ipsec" ]; then
		case $type in
		    No|no)
			;;
		    Yes|yes)
			[ -n "$POLICY_MATCH" ] || fatal_error "Your kernel and/or iptables does not support policy match"
			eval ${zone}_is_ipsec=Yes
			eval ${zone}_is_complex=Yes
			eval ${zone}_type=ipsec4
			;;
		    *)
			fatal_error "Invalid IPSEC column contents"
			;;
		esac
	    fi

	    do_options ""     $options
	    do_options "_in"  $in_options
	    do_options "_out" $out_options
	fi

    done < $TMP_DIR/$f
}

#
# Validate the zone names and options in the hosts file
#
validate_hosts_file() {
   local z
   local hosts
   local options
   local r
   local interface
   local host
   local option
   local zports
   local ipsec
   ipsec=

   check_bridge_port()
   {
       list_search ${interface}:${1} $zports || zports="$zports ${interface}:${1}"
       list_search $1 $ALL_PORTS || ALL_PORTS="$ALL_PORTS $1"
   }

   while read z hosts options; do
       r="$z $hosts $options"
       validate_zone1 $z || startup_error "Invalid zone ($z) in record \"$r\""

       case $hosts in
	   *:*)

	       interface=${hosts%%:*}
	       iface=$(chain_base $interface)

	       list_search  $interface $ALL_INTERFACES || \
		   startup_error "Unknown interface ($interface) in record \"$r\""

	       hosts=${hosts#*:}
	       ;;
	   *)
	       startup_error "Invalid HOST(S) column contents: $hosts"
	       ;;
       esac

       eval zports=\$${z}_ports

       if [ -z "$BRIDGING" ]; then
	   case $hosts in
	       *!*!*)
		   startup_error "Invalid hosts file entry: \"$r\""
		   ;;
	       !*)
		   hosts=0.0.0.0/0
		   eval ${z}_is_complex=Yes
		   ;;
	       *!*)
		   hosts=${hosts%%!*}
		   eval ${z}_is_complex=Yes
		   ;;
	   esac
       fi

       for host in $(separate_list $hosts); do
	    if [ -n "$BRIDGING" ]; then
		case $host in
		   *:*)
		       known_interface ${host%:*} && \
			   startup_error "Bridged interfaces may not be defined in ${CONFDIR}/interfaces: $host"
		       check_bridge_port ${host%%:*}
		       ;;
		   *.*.*)
		       ;;
		   *+|+*|*!*)
		       eval ${z}_is_complex=Yes
		       ;;
		   *)
		       known_interface $host && \
			   startup_error "Bridged interfaces may not be defined in ${CONFDIR}/interfaces: $host"
		       check_bridge_port $host
		       ;;
	       esac
	   else
		case $host in
		    *.*.*)
			;;
		    +*)
			eval ${z}_is_complex=Yes
			;;
		    *)
			startup_error "BRIDGING=Yes is needed for this zone definition: $r"
			;;
		esac
	    fi

	    for option in $(separate_list $options) ; do
		case $option in
		    norfc1918|blacklist|tcpflags|nosmurfs|-)
			;;
		    maclist)
		       	[ "$PROGRAM" = compiler ] && lib_load maclist "The 'maclist' option"
			;;
		    ipsec)
			[ -n "$POLICY_MATCH" ] || \
			    startup_error "Your kernel and/or iptables does not support policy match: ipsec"
			eval ${z}_ipsec_hosts=\"\$${z}_ipsec_hosts $interface:$host\"
			eval ${z}_is_complex=Yes
			ipsec=Yes
			;;
		   routeback)
			eval ${z}_routeback=\"$interface:$host \$${z}_routeback\"
			;;
		   *)
		       error_message "WARNING: Invalid option ($option) in record \"$r\""
		       ;;
	       esac
	   done
       done

       [ -n "$zports" ]  && eval ${z}_ports=\"$zports\"

   done < $TMP_DIR/hosts

   [ -n "$ALL_PORTS" ] && progress_message2 "   Bridge ports are: $ALL_PORTS"

   [ -n "${IPSEC_ZONES}${ipsec}" ] || POLICY_MATCH=
}

#
# Find interfaces to a given zone
#
# Search the variables representing the contents of the interfaces file and
# for each record matching the passed ZONE, echo the expanded contents of
# the "INTERFACE" column
#
find_interfaces() # $1 = interface zone
{
    local zne
    zne=$1
    local z
    local interface

    for interface in $ALL_INTERFACES; do
	eval z=\$$(chain_base $interface)_zone
	[ "x${z}" = x${zne} ] && echo $interface
    done
}

#
# Forward Chain for an interface
#
forward_chain() # $1 = interface
{
   echo $(chain_base $1)_fwd
}

#
# Input Chain for an interface
#
input_chain() # $1 = interface
{
   echo $(chain_base $1)_in
}

#
# Output Chain for an interface
#
output_chain() # $1 = interface
{
   echo $(chain_base $1)_out
}

#
# Masquerade Chain for an interface
#
masq_chain() # $1 = interface
{
   echo $(chain_base $1)_masq
}

#
# MAC Verification Chain for an interface
#
mac_chain() # $1 = interface
{
   echo $(chain_base $1)_mac
}

macrecent_target() # $1 - interface
{
    [ -n "$MACLIST_TTL" ] && echo $(chain_base $1)_rec || echo RETURN
}

#
# Functions for creating dynamic zone rules
#
dynamic_fwd() # $1 = interface
{
   echo $(chain_base $1)_dynf
}

dynamic_in() # $1 = interface
{
   echo $(chain_base $1)_dyni
}

dynamic_out() # $1 = interface
{
   echo $(chain_base $1)_dyno
}

dynamic_chains() #$1 = interface
{
   local c
   c=$(chain_base $1)

   echo ${c}_dyni ${c}_dynf ${c}_dyno
}

#
# DNAT Chain from a zone
#
dnat_chain() # $1 = zone
{
   echo ${1}_dnat
}

#
# SNAT Chain to an interface
#
snat_chain() # $1 = interface
{
   echo $(chain_base $1)_snat
}

#
# ECN Chain to an interface
#
ecn_chain() # $1 = interface
{
   echo $(chain_base $1)_ecn
}

#
# First chains for an interface
#
first_chains() #$1 = interface
{
   local c
   c=$(chain_base $1)

   echo ${c}_fwd ${c}_in
}

#
# Out Chain to an interface
#
out_chain() # $1 = interface
{
   echo $(chain_base $1)_out
}

#
# Horrible hack to work around an iptables limitation
#
iprange_echo()
{
    if [ -n "$KLUDGEFREE" ]; then
	echo "-m iprange $@"
    elif [ -f $TMP_DIR/iprange ]; then
	echo $@
    else
	echo "-m iprange $@"
	> $TMP_DIR/iprange
    fi
}

#
# Get set flags (ipsets).
#
get_set_flags() # $1 = set name and optional [levels], $2 = src or dst
{
    local temp
    local setname
    setname=$1
    local options
    options=$2

    [ -n "$IPSET_MATCH" ] || fatal_error "Your kernel and/or iptables does not include ipset match: $1"

    case $1 in
	*\[[1-6]\])
	    temp=${1#*\[}
	    temp=${temp%\]}
	    setname=${1%\[*}
	    while [ $temp -gt 1 ]; do
	       options="$options,$2"
	       temp=$(($temp - 1))
	    done
	    ;;
	*\[*\])
	    options=${1#*\[}
	    options=${options%\]}
	    setname=${1%\[*}
	    ;;
	*)
	    ;;
    esac

    echo "--set ${setname#+} $options"
}

#
# Horrible hack to work around an iptables limitation
#
physdev_echo()
{
    if [ -n "$KLUDGEFREE" ]; then
	echo -m physdev $@
    elif [ -f $TMP_DIR/physdev ]; then
	echo $@
    else
	echo -m physdev $@
	> $TMP_DIR/physdev
    fi
}

#
# Source IP range
#
source_ip_range() # $1 = Address or Address Range
{
    [ $# -gt 0 ] && case $1 in
	*.*.*.*-*.*.*.*)
	    case $1 in
		!*)
		    iprange_echo "! --src-range ${1#!}"
		    ;;
		*)
		    iprange_echo "--src-range $1"
		    ;;
	    esac
	    ;;
	!+*)
	    echo "-m set ! $(get_set_flags ${1#!} src)"
	    ;;
	+*)
	    echo "-m set $(get_set_flags $1 src)"
	    ;;
	*)
	    echo "-s $1"
	    ;;
    esac
}

#
# Destination IP range
#
dest_ip_range() # $1 = Address or Address Range
{
    [ $# -gt 0 ] && case $1 in
	*.*.*.*-*.*.*.*)
	    case $1 in
		!*)
		    iprange_echo "! --dst-range ${1#!}"
		    ;;
		*)
		    iprange_echo "--dst-range $1"
		    ;;
	    esac
	    ;;
	!+*)
	    echo "-m set ! $(get_set_flags ${1#!} dst)"
	    ;;
	+*)
	    echo "-m set $(get_set_flags $1 dst)"
	    ;;
	*)
	    echo "-d $1"
	    ;;
    esac
}

both_ip_ranges() # $1 = Source address or range, $2 = dest address or range
{
    local rangeprefix
    rangeprefix=
    local setprefix
    setprefix=
    local rangematch
    rangematch=
    local setmatch
    setmatch=

    case $1 in
	*.*.*.*-*.*.*.*)
	    rangeprefix="-m iprange"
	    rangematch="--src-range $1"
	    ;;
	!+*)
	    setprefix="-m set"
	    setmatch="! $(get_set_flags ${1#!} src)"
	    ;;
	+*)
	    setprefix="-m set"
	    setmatch="$(get_set_flags $1 src)"
	    ;;
	*)
	    rangematch="-s $1"
	    ;;
    esac

    case $2 in
	*.*.*.*-*.*.*.*)
	    rangeprefix="-m iprange"
	    rangematch="$rangematch --dst-range $2"
	    ;;
	!+*)
	    setprefix="-m set"
	    match="$setmatch ! $(get_set_flags ${2#!} dst)"
	    ;;
	+*)
	    setprefix="-m set"
	    setmatch="$setmatch $(get_set_flags $2 dst)"
	    ;;
	*)
	    rangematch="$rangematch -d $2"
	    ;;
    esac

    echo "$rangeprefix $rangematch $setprefix $setmatch"
}

#
# Loosly Match the name of an interface
#

if_match() # $1 = Name in interfaces file - may end in "+"
           # $2 = Full interface name - may also end in "+"
{
    local pattern
    pattern=${1%+}

    case $1 in
	*+)
	    test  "x$(echo $2 | truncate ${#pattern} )" = "x${pattern}"
	    ;;
	*)
	    test "x$1" = "x$2"
	    ;;
    esac
}

#
# We allow hosts to be specified by IP address or by physdev. These two functions
# are used to produce the proper match in a netfilter rule.
#
match_source_hosts()
{
    if [ -n "$BRIDGING" ]; then
	case $1 in
	    *:*)
		physdev_echo "--physdev-in ${1%:*} $(source_ip_range ${1#*:})"
		;;
	    *.*.*.*|+*|!+*)
		echo $(source_ip_range $1)
		;;
	    *)
		physdev_echo "--physdev-in $1"
		;;
	esac
    else
	echo $(source_ip_range $1)
    fi
}

match_dest_hosts()
{
    if [ -n "$BRIDGING" ]; then
	case $1 in
	    *:*)
		physdev_echo "--physdev-out ${1%:*} $(dest_ip_range ${1#*:})"
		;;
	    *.*.*.*|+*|!+*)
		echo $(dest_ip_range $1)
		;;
	    *)
		physdev_echo "--physdev-out $1"
		;;
	esac
    else
	echo $(dest_ip_range $1)
    fi
}
#
# Matches for either <address-range> or <interface>:<address range>
#
match_source()
{
    case "$1" in
	*:*)
	    echo "-i ${1%%:*} $(match_source_hosts ${1#*:})"
	    ;;
	*)
	    echo $(dest_ip_range $1)
	    ;;
    esac
}

match_dest()
{
    case "$1" in
	*:*)
	    echo "-o ${1%%:*} $(match_dest_hosts ${1#*:})"
	    ;;
	*)
	    echo $(dest_ip_range $1)
	    ;;
    esac
}

#
# Similarly, the source or destination in a rule can be qualified by a device name. If
# the device is defined in ${CONFDIR}/interfaces then a normal interface match is
# generated (-i or -o); otherwise, a physdev match is generated.
#-------------------------------------------------------------------------------------
#
# loosely match the passed interface with those in ${CONFDIR}/interfaces.
#
known_interface() # $1 = interface name
{
    local iface

    for iface in $ALL_INTERFACES ; do
	if if_match $iface $1 ; then
	    return 0
	fi
    done

    return 1
}

known_port() # $1 = port name
{
    local port

    for port in $ALL_PORTS ; do
	if if_match $port $1 ; then
	    return 0
	fi
    done

    return 1
}

match_source_dev()
{
    if [ -n "$BRIDGING" ]; then
	known_port $1 && physdev_echo "--physdev-in $1" || echo -i $1
    elif known_interface $1; then
	echo -i $1
    elif [ -n "$PHYSDEV_MATCH" ]; then
	physdev_echo "--physdev-in $1"
    else
	echo -i $1
    fi
}

match_dest_dev()
{
    if [ -n "$BRIDGING" ]; then
	known_port $1 && physdev_echo "--physdev-out $1" || echo -o $1
    elif known_interface $1; then
	echo -o $1
    elif [ -n "$PHYSDEV_MATCH" ]; then
	physdev_echo "--physdev-out $1"
    else
	echo -o $1
    fi
}

verify_interface()
{
    known_interface $1 || { [ -n "$BRIDGING" ] && known_port $1 ; }
}

#
# Determine if communication to/from a host is encrypted using IPSEC
#
is_ipsec_host() # $1 = zone, $2 = host
{
    local is_ipsec
    eval is_ipsec=\$${1}_is_ipsec
    local hosts
    eval hosts=\"\$${1}_ipsec_hosts\"

    test -n "$is_ipsec" || list_search $2 $hosts
}

#
# Generate a match for decrypted packets
#
match_ipsec_in() # $1 = zone, $2 = host
{
    if is_ipsec_host $1 $2 ; then
	local options
	eval options=\"\$${1}_ipsec_options \$${1}_ipsec_in_options\"
	echo "-m policy --pol ipsec --dir in $options"
    elif [ -n "$POLICY_MATCH" ]; then
	echo "-m policy --pol none --dir in"
    fi
}

#
# Generate a match for packets that will be encrypted
#
match_ipsec_out() # $1 = zone, $2 = host
{
    if is_ipsec_host $1 $2 ; then
	local options
	eval options=\"\$${1}_ipsec_options \$${1}_ipsec_out_options\"
	echo "-m policy --pol ipsec --dir out $options"
    elif [ -n "$POLICY_MATCH" ]; then
	echo "-m policy --pol none --dir out"
    fi
}

#
# Jacket for ip_range() that takes care of iprange match
#

firewall_ip_range() # $1 = IP address or range
{
    [ -n "$IPRANGE_MATCH" ] && echo $1 || ip_range $1
}

#
#
# Find hosts in a given zone
#
# Read hosts file and for each record matching the passed ZONE,
# echo the expanded contents of the "HOST(S)" column
#
find_hosts() # $1 = host zone
{
    local hosts
    local interface
    local address
    local addresses

    while read z hosts options; do
	if [ "x$(expand $z)" = "x$1" ]; then
	    interface=${hosts%%:*}
	    addresses=${hosts#*:}
	    case $addresses in
		!*)
		    echo $interface:0.0.0.0/0
		    ;;
		*)
		    for address in $(separate_list ${addresses%%!*}); do
			echo $interface:$address
		    done
		    ;;
	    esac
	fi
    done < $TMP_DIR/hosts
}

#
#
# Find exclusions in a given zone
#
# Read hosts file and for each record matching the passed ZONE,
# echo any exclusions
#
find_exclusions() # $1 = host zone
{
    local hosts
    local interface
    local address
    local addresses

    while read z hosts options; do
	if [ "x$z" = "x$1" ]; then
	    interface=${hosts%%:*}
	    addresses=${hosts#*:}
	    case $addresses in
		*!*)
		    for address in $(separate_list ${addresses#*!}); do
			echo $interface:$address
		    done
		    ;;
	    esac
	fi
    done < $TMP_DIR/hosts
}

#
# Determine the interfaces on the firewall
#
# For each zone, create a variable called ${zone}_interfaces. This
# variable contains a space-separated list of interfaces to the zone
#
determine_interfaces() {
    for zone in $ZONES; do
	interfaces=$(find_interfaces $zone)
	interfaces=$(echo $interfaces) # Remove extra trash
	eval ${zone}_interfaces=\"\$interfaces\"
    done
}

#
# Determine if an interface has a given option
#
interface_has_option() # $1 = interface, #2 = option
{
    local options

    eval options=\$$(chain_base $1)_options

    list_search $2 $options
}

#
# Determine the defined hosts in each zone
#
determine_hosts() {
    for zone in $ZONES; do
	hosts=$(find_hosts $zone)
	hosts=$(echo $hosts) # Remove extra trash
	exclusions=$(find_exclusions $zone)
	exclusions=$(echo $exclusions) # Remove extra trash

	eval interfaces=\$${zone}_interfaces

	for interface in $interfaces; do
	    if interface_has_option $interface detectnets; then
		networks=$(get_routed_networks $interface "detectnets not allowed on interface with default route - $interface" )
	    else
		networks=0.0.0.0/0
	    fi

	    for network in $networks; do
		if [ -z "$hosts" ]; then
		    hosts=$interface:$network
		else
		    hosts="$hosts $interface:$network"
		fi

		if interface_has_option $interface routeback; then
		    eval ${zone}_routeback=\"$interface:$network \$${zone}_routeback\"
		fi
	    done
	done

	interfaces=

	for host in $hosts; do
	    interface=${host%:*}
	    if list_search $interface $interfaces; then
		list_search $interface:0.0.0.0/0 $hosts && \
		    startup_error "Invalid zone definition for zone $zone"
		list_search $interface:0/0 $hosts && \
		    startup_error "Invalid zone definition for zone $zone"
		eval ${zone}_is_complex=Yes
	    else
		if [ -z "$interfaces" ]; then
		    interfaces=$interface
		else
		    interfaces="$interfaces $interface"
		fi
	    fi
	done

	eval ${zone}_exclusions="\$exclusions"
	eval ${zone}_interfaces="\$interfaces"
	eval ${zone}_hosts="\$hosts"

	if [ -n "$hosts" ]; then
	    if [ $VERBOSE -ge 1 ]; then
		[ -n "$exclusions" ] && display_list "$zone Zone:" $hosts minus "($exclusions)" || display_list "$zone Zone:" $hosts
	    fi
	else
	    error_message "WARNING: Zone $zone is empty"
	fi
    done
}

#
# Ensure that the passed zone is defined in the zones file or is the firewall
#
validate_zone() # $1 = zone
{
    list_search $1 $ZONES $FW
}
#
# Ensure that the passed zone is defined in the zones file.
#
validate_zone1() # $1 = zone
{
    list_search $1 $ZONES
}

#
# Format a match by the passed MAC address
# The passed address begins with "~" and uses "-" as a separator between bytes
# Example: ~01-02-03-04-05-06
#
mac_match() # $1 = MAC address formated as described above
{
    echo "--match mac --mac-source $(echo $1 | sed 's/~//;s/-/:/g')"
}

#
# Find interfaces that have the passed option specified
#
find_interfaces_by_option() # $1 = option
{
    for interface in $ALL_INTERFACES; do
	eval options=\$$(chain_base $interface)_options
	list_search $1 $options && echo $interface
    done
}

#
# This slightly slower version is used to find both the option and option followed
# by equal sign ("=") and a value
#
find_interfaces_by_option1() # $1 = option
{
    local options
    local option

    for interface in $ALL_INTERFACES; do
	eval options=\$$(chain_base $interface)_options
	for option in $options; do
	    if [ "${option%=*}" = "$1" ]; then
		echo $interface
		break
	    fi
	done
    done
}

#
# Find hosts with the passed option
#
find_hosts_by_option() # $1 = option
{
    local ignore
    local hosts
    local interface
    local address
    local addresses
    local options
    local ipsec
    ipsec=
    local list

    while read ignore hosts options; do
	list=$(separate_list $options)
	if list_search $1 $list; then
	    list_search ipsec $list && ipsec=ipsec || ipsec=none
	    interface=${hosts%%:*}
	    addresses=${hosts#*:}
	    for address in $(separate_list $addresses); do
		echo ${ipsec}^$interface:$address
	    done
	fi
    done < $TMP_DIR/hosts

    for interface in $ALL_INTERFACES; do
	interface_has_option $interface $1 && \
	    echo none^${interface}:0.0.0.0/0
    done
}

#
# Process the routestopped file either adding or deleting rules
#
process_routestopped() # $1 = command
{
    local hosts
    hosts=
    local interface
    local host
    local host1
    local options
    local networks
    local source
    source=
    local dest
    dest=
    local matched

    while read interface host options; do
	[ "x$host" = "x-" -o -z "$host" ] && host=0.0.0.0/0
	for h in $(separate_list $host); do
	    hosts="$hosts $interface:$h"
	done

	routeback=

	if [ -n "$options" ]; then
	    for option in $(separate_list $options); do
		case $option in
		    routeback)
			if [ -n "$routeback" ]; then
			    error_message "WARNING: Duplicate routestopped option ignored: routeback"
			else
			    routeback=Yes
			    for h in $(separate_list $host); do
				run_iptables $1 FORWARD -i $interface -o $interface $(both_ip_ranges $h $h) -j ACCEPT
			    done
			fi
			;;
		    source)
			for h in $(separate_list $host); do
			    source="$source $interface:$h"
			done
			;;
		    dest)
			for h in $(separate_list $host); do
			    dest="$dest $interface:$h"
			done
			;;
		    critical)
			;;
		    *)
			error_message "WARNING: Unknown routestopped option ignored: $option"
			;;
		esac
	    done
	fi

    done < $TMP_DIR/routestopped


    for host in $hosts; do
	interface=${host%:*}
	networks=${host#*:}
	source_range=$(source_ip_range $networks)
	dest_range=$(dest_ip_range $networks)
	run_iptables $1 INPUT  -i $interface $source_range -j ACCEPT
	[ -z "$ADMINISABSENTMINDED" ] && \
	    run_iptables $1 OUTPUT -o $interface $dest_range -j ACCEPT

	matched=

	if list_search $host $source ; then
	    run_iptables $1 FORWARD -i $interface $source_range -j ACCEPT
	    matched=Yes
	fi

	if list_search $host $dest ; then
	    run_iptables $1 FORWARD -o $interface $dest_range -j ACCEPT
	    matched=Yes
	fi

	if [ -z "$matched" ]; then
	    for host1 in $hosts; do
		[ "$host" != "$host1" ] && run_iptables $1 FORWARD -i $interface -o ${host1%:*} $(both_ip_ranges $networks ${host1#*:}) -j ACCEPT
	    done
	fi
    done
}

process_criticalhosts()
{
    local hosts
    hosts=
    local interface
    local host
    local h
    local options
    local networks
    local criticalhosts
    criticalhosts=

    while read interface host options; do
	[ "x$host" = "x-" -o -z "$host" ] && host=0.0.0.0/0 || host=$(separate_list $host)

	if [ -n "$options" ]; then
	    for option in $(separate_list $options); do
		case $option in
		    routeback|source|dest)
			;;
		    critical)
			for h in $host; do
			    criticalhosts="$criticalhosts $interface:$h"
			done
			;;
		    *)
			error_message "WARNING: Unknown routestopped option ignored: $option"
			;;
		esac
	    done
	fi
    done < $TMP_DIR/routestopped

    if [ -n "$criticalhosts" ]; then
	CRITICALHOSTS=$criticalhosts
	progress_message "Critical Hosts are:$CRITICALHOSTS"
    fi

}

#
# create a temporary directory
#
mktempdir() {

    [ -z "$MKTEMP" ] && find_mktemp

    case "$MKTEMP" in
	STD)
	    mktemp -td shorewall.XXXXXX
	    ;;
	None|BSD)
	    #
	    # Not all versions of the BSD mktemp support the -d option under Linux
	    #
	    qt rm -rf /tmp/shorewall-$$
	    mkdir -p /tmp/shorewall-$$ && chmod 700 /tmp/shorewall-$$ && echo /tmp/shorewall-$$
	    ;;
	*)
	    error_message "ERROR:Internal error in mktempdir"
	    ;;
	esac
}

#
# Read a file and handle "INCLUDE" directives
#

read_file() # $1 = file name, $2 = nest count
{
    local first
    local rest

    if [ -f $1 ]; then
	while read first rest; do
	    if [ "x$first"  = "xINCLUDE" ]; then
		if [ $2 -lt 4 ]; then
		    read_file $(find_file $(expand ${rest%#*})) $(($2 + 1))
		else
		    error_message "WARNING: INCLUDE in $1 ignored (nested too deeply)"
		fi
	    else
		echo "$first $rest"
	    fi
	done < $1
    else
	[ -n "$TERMINATOR" ] && $TERMINATOR "No such file: $1"
	echo "WARNING -- No such file: $1"
    fi
}

#
# Strip comments and blank lines from a file and place the result in the
# temporary directory
#
strip_file() # $1 = Base Name of the file, $2 = Full Name of File (optional)
{
    local fname

    if [ ! -f $TMP_DIR/$1 ]; then
	[ $# = 1 ] && fname=$(find_file $1) || fname=$2

	if [ -f $fname ]; then
	    read_file $fname 0 | cut -d'#' -f1 | grep -v '^[[:space:]]*$' | expand_line > $TMP_DIR/$1
	else
	    > $TMP_DIR/$1
	fi
    fi
}

#
# Strip the passed file.
#
# Return success if
#     a) the stripped file is non-empty and the library was successfully loaded; or
#     b) the stripped file is empty but the library had been loaded previously
#
strip_file_and_lib_load() # $1 = logical file name, $2 = library to load if the stripped file is non-empty
{
    local f
    f=$(find_file $1)

    strip_file $1 $f

    if [ -s $TMP_DIR/$1 ]; then
	lib_load $2 "A non-empty $1 file ($f)"
	return 0
    fi

    eval test -n \"\$LIB_${2}_LOADED\"
}

#
# Check that a mark value or mask is less that 256 or that it is less than 65536 and
# that it's lower 8 bits are zero.
#
verify_mark() # $1 = value to test
{
    verify_mark2()
    {
	case $1 in
	    0*)
		[ $(($1)) -lt 256 ] && return 0
		[ -n "$HIGH_ROUTE_MARKS" ] || return 1
		[ $(($1)) -gt 65535 ] && return 1
		return $(($1 & 0xFF))
		;;
	    [1-9]*)
		[ $1 -lt 256 ] && return 0
		[ -n "$HIGH_ROUTE_MARKS" ] || return 1
		[ $1 -gt 65535 ] && return 1
		return $(($1 & 0xFF))
		;;
	    *)
		return 2
		;;
	esac
    }

    verify_mark2 $1 || fatal_error "Invalid Mark or Mask value: $1"
}

#
# Determine the value for a parameter that defaults to Yes
#
added_param_value_yes() # $1 = Parameter Name, $2 = Parameter value
{
    local val
    val="$2"

    if [ -z "$val" ]; then
	echo "Yes"
    else case $val in
	[Yy][Ee][Ss])
	    echo "Yes"
	    ;;
	[Nn][Oo])
	    echo ""
	    ;;
	*)
	    startup_error "Invalid value ($val) for $1"
	    ;;
	esac
    fi
}

#
# Determine the value for a parameter that defaults to No
#
added_param_value_no() # $1 = Parameter Name, $2 = Parameter value
{
    local val
    val="$2"

    if [ -z "$val" ]; then
	echo ""
    else case $val in
	[Yy][Ee][Ss])
	    echo "Yes"
	    ;;
	[Nn][Oo])
	    echo ""
	    ;;
	*)
	    startup_error "Invalid value ($val) for $1"
	    ;;
	esac
    fi
}

#
# Initialize this program
#
do_initialize() {

    # Run all utility programs using the C locale
    #
    # Thanks to Vincent Planchenault for this tip #

    export LC_ALL=C

    # Make sure umask is sane
    umask 077

    PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
    #
    # Establish termination function
    #
    TERMINATOR=fatal_error
    #
    # Clear all configuration variables (shorewall.conf)
    #
    STARTUP_ENABLED=
    #
    #VERBOSE is inherited -- VERBOSITY is only used in the CIs
    #    
    #
    # Logging
    #
    LOGFILE=
    LOGFORMAT=
    LOGTAGONLY=
    LOGRATE=
    LOGBURST=
    LOGALLNEW=
    BLACKLIST_LOGLEVEL=
    MACLIST_LOG_LEVEL=
    TCP_FLAGS_LOG_LEVEL=
    RFC1918_LOG_LEVEL=
    SMURF_LOG_LEVEL=
    LOG_MARTIANS=
    #
    # Location of files
    #
    IPTABLES=
    #PATH is inherited
    SHOREWALL_SHELL=
    SUBSYSLOCK=
    MODULESDIR=
    #CONFIG_PATH is inherited
    RESTOREFILE=
    IPSECFILE=
    LOCKFILE=
    #
    # Default Actions/Macros
    #
    DROP_DEFAULT=
    REJECT_DEFAULT=
    ACCEPT_DEFAULT=
    QUEUE_DEFAULT=
    #
    # Firewall Options
    #
    IP_FORWARDING=
    ADD_IP_ALIASES=
    ADD_SNAT_ALIASES=
    RETAIN_ALIASES=
    TC_ENABLED=
    TC_EXPERT=
    CLEAR_TC=
    MARK_IN_FORWARD_CHAIN=
    CLAMPMSS=
    ROUTE_FILTER=
    DETECT_DNAT_IPADDRS=
    MUTEX_TIMEOUT=
    ADMINISABSENTMINDED=
    BLACKLISTNEWONLY=
    DELAYBLACKLISTLOAD=
    MODULE_SUFFIX=
    DISABLE_IPV6=
    BRIDGING=
    DYNAMIC_ZONES=
    PKTTYPE=
    RFC1918_STRICT=
    MACLIST_TABLE=
    MACLIST_TTL=
    SAVE_IPSETS=
    MAPOLDACTIONS=
    FASTACCEPT=
    IMPLICIT_CONTINUE=
    HIGH_ROUTE_MARKS=
    USE_ACTIONS=
    OPTIMIZE=
    EXPORTPARAMS=
    KEEP_TC_RULES=
    DELETE_THEN_ADD=
    DONT_LOAD=
    #
    # Packet Disposition
    #
    MACLIST_DISPOSITION=
    TCP_FLAGS_DISPOSITION=
    BLACKLIST_DISPOSITION=
    #
    # Other Globals
    #
    VERSION=
    FW=
    USEPKTYPE=
    LOGLIMIT=
    LOGPARMS=
    OUTPUT=
    ALL_INTERFACES=
    ROUTEMARK_INTERFACES=
    PROVIDERS=
    CRITICALHOSTS=
    EXCLUSION_SEQ=1
    STOPPING=
    HAVE_MUTEX=
    ALIASES_TO_ADD=
    SECTION=ESTABLISHED
    SECTIONS=
    ALL_PORTS=
    ACTIONS=
    USEDACTIONS=
    DEFAULT_MACROS=
    COMMENT=
    VERSION_FILE=
    LOGRULENUMBERS=
    ORIGINAL_POLICY_MATCH=
    ORIGINAL_MANGLE_ENABLED=

    ensure_config_path

    VERSION_FILE=$SHAREDIR/version

    [ -f $VERSION_FILE ] && VERSION=$(cat $VERSION_FILE)

    [ -d /usr/share/shorewall-perl ] && set -a; 
    
    run_user_exit params

    set +a

    config=$(find_file shorewall.conf)

    if [ -f $config ]; then
	if [ -r $config ]; then
	    progress_message "Processing $config..."
	    . $config
	else
	    startup_error "Cannot read $config (Hint: Are you root?)"
	fi
    else
	startup_error "$config does not exist!"
    fi
    #
    # Restore CONFIG_PATH if the shorewall.conf file cleared it
    #
    ensure_config_path

    TMP_DIR=$(mktempdir)

    [ -n "$TMP_DIR" ] && chmod 700 $TMP_DIR || \
       startup_error "Can't create a temporary directory"

    case $PROGRAM in
	compiler)
	    trap "[ -n "$OUTPUT" ] && rm -f $OUTPUT;rm -rf $TMP_DIR; exit 2" 1 2 3 4 5 6 9
	    ;;
	firewall)
	    trap "[ -n "$RESTOREBASE" ] && rm -f $RESTOREBASE;rm -rf $TMP_DIR; exit 2" 1 2 3 4 5 6 9
	    ;;
    esac

    #
    # Determine the capabilities of the installed iptables/netfilter
    # We load the kernel modules here to accurately determine
    # capabilities when module autoloading isn't enabled.
    #
    PKTTYPE=$(added_param_value_no PKTTYPE $PKTTYPE)
    [ -n "$DONT_LOAD" ] && DONT_LOAD="$(echo $DONT_LOAD | sed 's/,/ /g' )"

    [ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ]

    if [ -z "$EXPORT" -a $(id -u) -eq 0 ]; then

	load_kernel_modules Yes

	if [ -z "$IPTABLES" ]; then
	    IPTABLES=$(mywhich iptables 2> /dev/null)
	    [ -z "$IPTABLES" ] && startup_error "Can't find iptables executable"
	else
	    [ -e "$IPTABLES" ] || startup_error "\$IPTABLES=$IPTABLES does not exist or is not executable"
	fi

	f=$(find_file capabilities)

	[ -f $f ] && . $f || determine_capabilities
    else
	f=$(find_file capabilities)
	[ -f $f ] && . $f || startup_error "The -e flag requires a capabilities file"
    fi

    if [ -n "$CAPVERSION" ]; then
	[ $CAPVERSION -ge $SHOREWALL_CAPVERSION ] || error_message "WARNING: $f is out of date -- it does not contain all of the capabilities defined by Shorewall version $VERSION"
    else
	error_message "WARNING: $f may be not contain all of the capabilities defined by Shorewall version $VERSION"
    fi

    ORIGINAL_POLICY_MATCH=$POLICY_MATCH
    ORIGINAL_MANGLE_ENABLED=$MANGLE_ENABLED
    
    ADD_IP_ALIASES="$(added_param_value_yes ADD_IP_ALIASES $ADD_IP_ALIASES)"

    if [ -n "${LOGRATE}${LOGBURST}" ]; then
	LOGLIMIT="--match limit"
	[ -n "$LOGRATE" ]  && LOGLIMIT="$LOGLIMIT --limit $LOGRATE"
	[ -n "$LOGBURST" ] && LOGLIMIT="$LOGLIMIT --limit-burst $LOGBURST"
    fi

    if [ -n "$IP_FORWARDING" ]; then
	case "$IP_FORWARDING" in
	    On|Off|Yes|No|Keep|on|off|yes|no|keep|ON|OFF|YES|NO|KEEP)
		;;
	    *)
		startup_error "Invalid value ($IP_FORWARDING) for IP_FORWARDING"
		;;
	esac
    else
	IP_FORWARDING=On
    fi

    if [ -n "$ROUTE_FILTER" ]; then
	case "$ROUTE_FILTER" in
	    Yes|yes|YES)
		ROUTE_FILTER=yes
		;;
	    No|no|NO)
		ROUTE_FILTER=no
		;;
	    Keep|keep|KEEP)
		ROUTE_FILTER=
		;;
	    *)
		startup_error "Invalid value ($ROUTE_FILTER) for ROUTE_FILTER"
		;;
	esac
    else
	ROUTE_FILTER=
    fi

    if [ -n "$LOG_MARTIANS" ]; then
	case "$LOG_MARTIANS" in
	    Yes|yes|YES)
		LOG_MARTIANS=yes
		;;
	    No|no|NO)
		LOG_MARTIANS=no
		;;
	    Keep|keep|KEEP)
		LOG_MARTIANS=
		;;
	    *)
		startup_error "Invalid value ($LOG_MARTIANS) for LOG_MARTIANS"
		;;
	esac
    else
	LOG_MARTIANS=yes
    fi

    [ -n "${BLACKLIST_DISPOSITION:=DROP}" ]

    case "$CLAMPMSS" in
	[0-9]*)
	    ;;
	*)
	    CLAMPMSS=$(added_param_value_no CLAMPMSS $CLAMPMSS)
	    ;;
    esac

    ADD_SNAT_ALIASES=$(added_param_value_no ADD_SNAT_ALIASES $ADD_SNAT_ALIASES)
    DETECT_DNAT_IPADDRS=$(added_param_value_no DETECT_DNAT_IPADDRS $DETECT_DNAT_IPADDRS)

    MACLIST_TARGET=reject

    if [ -n "$MACLIST_DISPOSITION" ] ; then
	case $MACLIST_DISPOSITION in
	    REJECT)
		;;
	    DROP)
		MACLIST_TARGET=DROP
		;;
	    ACCEPT)
		MACLIST_TARGET=RETURN
		;;
	    *)
		startup_error "Invalid value ($MACLIST_DISPOSITION) for MACLIST_DISPOSITION"
		;;
	esac
    else
	MACLIST_DISPOSITION=REJECT
    fi

    if [ -n "$TCP_FLAGS_DISPOSITION" ] ; then
	case $TCP_FLAGS_DISPOSITION in
	    REJECT|ACCEPT|DROP)
		;;
	    *)
		startup_error "Invalid value ($TCP_FLAGS_DISPOSITION) for TCP_FLAGS_DISPOSITION"
		;;
	esac
    else
	TCP_FLAGS_DISPOSITION=DROP
    fi

    [ -n "${RFC1918_LOG_LEVEL:=info}" ]

    MARK_IN_FORWARD_CHAIN=$(added_param_value_no MARK_IN_FORWARD_CHAIN $MARK_IN_FORWARD_CHAIN)
    [ -n "$MARK_IN_FORWARD_CHAIN" ] && MARKING_CHAIN=tcfor || MARKING_CHAIN=tcpre
    CLEAR_TC=$(added_param_value_yes CLEAR_TC $CLEAR_TC)

    if [ -n "$LOGFORMAT" ]; then
	if [ -n "$(echo $LOGFORMAT | grep '%d')" ]; then
	    LOGRULENUMBERS=Yes
	    temp=$(printf "$LOGFORMAT" fooxx2barxx 1 ACCEPT 2> /dev/null)
	    if [ $? -ne 0 ]; then
		startup_error "Invalid LOGFORMAT string: \"$LOGFORMAT\""
	    fi
	else
	    temp=$(printf "$LOGFORMAT" fooxx2barxx ACCEPT 2> /dev/null)
	    if [ $? -ne 0 ]; then
		startup_error "Invalid LOGFORMAT string: \"$LOGFORMAT\""
	    fi
	fi

	[ ${#temp} -le 29 ] || startup_error "LOGFORMAT string is longer than 29 characters: \"$LOGFORMAT\""

	MAXZONENAMELENGTH=$(( 5 + ( ( 29 - ${#temp}) / 2) ))
	MAXZONENAMELENGTH=${MAXZONENAMELENGTH%.*}
    else
	LOGFORMAT="Shorewall:%s:%s:"
	MAXZONENAMELENGTH=5
    fi

    ADMINISABSENTMINDED=$(added_param_value_no ADMINISABSENTMINDED $ADMINISABSENTMINDED)
    BLACKLISTNEWONLY=$(added_param_value_no BLACKLISTNEWONLY $BLACKLISTNEWONLY)
    DISABLE_IPV6=$(added_param_value_no DISABLE_IPV6 $DISABLE_IPV6)
    BRIDGING=$(added_param_value_no BRIDGING $BRIDGING)

    DYNAMIC_ZONES=$(added_param_value_no DYNAMIC_ZONES $DYNAMIC_ZONES)
    if [ -n "$DYNAMIC_ZONES" ]; then
	[ -n "$EXPORT" ] && startup_error "DYNAMIC_ZONES=Yes is incompatible with the -e option"
	lib_avail dynamiczones || error_message "WARNING: DYNAMIC_ZONES=Yes requires the Shorewall dynamiczones library (${SHAREDIR}/lib.dynamiczones) which is not installed"
    fi

    STARTUP_ENABLED=$(added_param_value_yes STARTUP_ENABLED $STARTUP_ENABLED)
    RETAIN_ALIASES=$(added_param_value_no RETAIN_ALIASES $RETAIN_ALIASES)
    [ -n "${ADD_IP_ALIASES}${ADD_SNAT_ALIASES}" ] || RETAIN_ALIASES=
    DELAYBLACKLISTLOAD=$(added_param_value_no DELAYBLACKLISTLOAD $DELAYBLACKLISTLOAD)
    LOGTAGONLY=$(added_param_value_no LOGTAGONLY $LOGTAGONLY)
    RFC1918_STRICT=$(added_param_value_no RFC1918_STRICT $RFC1918_STRICT)
    SAVE_IPSETS=$(added_param_value_no SAVE_IPSETS $SAVE_IPSETS)
    MAPOLDACTIONS=$(added_param_value_yes MAPOLDACTIONS $MAPOLDACTIONS)
    FASTACCEPT=$(added_param_value_no FASTACCEPT $FASTACCEPT)

    [ -n "$FASTACCEPT" -a -z "$BLACKLISTNEWONLY" ] && error_message "WARNING: BLACKLISTNEWONLY=No does not work with FASTACCEPT=Yes"

    IMPLICIT_CONTINUE=$(added_param_value_no IMPLICIT_CONTINUE $IMPLICIT_CONTINUE)
    HIGH_ROUTE_MARKS=$(added_param_value_no HIGH_ROUTE_MARKS $HIGH_ROUTE_MARKS)
    TC_EXPERT=$(added_param_value_no TC_EXPERT $TC_EXPERT)
    USE_ACTIONS=$(added_param_value_yes USE_ACTIONS $USE_ACTIONS)
    EXPORTPARAMS=$(added_param_value_yes EXPORTPARAMS $EXPORTPARAMS)
    KEEP_TC_RULES=$(added_param_value_no KEEP_TC_RULES $KEEP_TC_RULES)
    DELETE_THEN_ADD=$(added_param_value_yes DELETE_THEN_ADD $DELETE_THEN_ADD)

    if [ -n "$MANGLE_ENABLED" ] ; then
	case $MANGLE_ENABLED in
	    Yes|yes)
		;;
	    No|no)
		MANGLE_ENABLED=
		;;
	    *)
		startup_error "Invalid value ($MANGLE_ENABLED) for MANGLE_ENABLED";
		;;
	esac
    fi

    [ "$PROGRAM" = compiler ] && [ -n "$USE_ACTIONS" ] && lib_load actions "USE_ACTIONS=Yes"

    [ -n "$XCONNMARK_MATCH" ] || XCONNMARK=
    [ -n "$XMARK" ] || XCONNMARK=

    [ -n "$HIGH_ROUTE_MARKS" -a -z "$XCONNMARK" ] && startup_error "HIGH_ROUTE_MARKS=Yes requires extended CONNMARK target, extended CONNMARK match support and extended MARK support"

    case ${MACLIST_TABLE:=filter} in
	filter)
	    ;;
	mangle)
	    [ $MACLIST_DISPOSITION = reject ] && startup_error "MACLIST_DISPOSITION=REJECT is not allowed with MACLIST_TABLE=mangle"
	    ;;	*)
	    startup_error "Invalid value ($MACLIST_TABLE) for MACLIST_TABLE option"
	    ;;
    esac

   TC_SCRIPT=

   if [ -n "$TC_ENABLED" ] ; then
	case "$TC_ENABLED" in
	    [Yy][Ee][Ss])
		TC_ENABLED=Yes
		TC_SCRIPT=$(find_file tcstart)
		[ -f $TC_SCRIPT ] || startup_error "Unable to find tcstart file"
		;;
	    [Ii][Nn][Tt][Ee][Rr][Nn][Aa][Ll])
	        TC_ENABLED=Internal
		;;
	    [Nn][Oo])
		TC_ENABLED=
		;;
	esac
    else
	TC_ENABLED=Yes
    fi

    if [ -n "$TC_ENABLED" ];then
	[ -n "$ORIGINAL_MANGLE_ENABLED" ] || startup_error "Traffic Shaping requires mangle support in your kernel and iptables"
	[ -n "$MANGLE_ENABLED" ]          || startup_error "Traffic Shaping requires MANGLE_ENABLED=Yes in shorewall.conf"
    fi

    [ "x${SHOREWALL_DIR}" = "x." ] && SHOREWALL_DIR="$PWD"
    [ -n "${RESTOREFILE:=restore}" ]

    case "${DROP_DEFAULT:=Drop}" in
	None)
	    DROP_DEFAULT=none
	    ;;
    esac

    case "${REJECT_DEFAULT:=Reject}" in
	None)
	    REJECT_DEFAULT=none
	    ;;
    esac

    case "${QUEUE_DEFAULT:=none}" in
	None)
	    QUEUE_DEFAULT=none
	    ;;
    esac

    case "${ACCEPT_DEFAULT:=none}" in
	None)
	    ACCEPT_DEFAULT=none
	    ;;
    esac

    case "${OPTIMIZE:=0}" in
	0|1)
	    ;;
	*)
	    startup_error "Invalid OPTIMIZE value ($OPTIMIZE)"
	    ;;
    esac

    if [ -n "$LOCKFILE" ]; then
	[ -d $(dirname $LOCKFILE) ] || startup_error "LOCKFILE=$LOCKFILE: Directory $(dirname $LOCKFILE) does not exist"
    fi
    #
    # Check out the user's shell
    #
    [ -n "${SHOREWALL_SHELL:=/bin/sh}" ]

    temp=$(decodeaddr 192.168.1.1)
    if [ $(encodeaddr $temp) != 192.168.1.1 ]; then
	startup_error "Shell $SHOREWALL_SHELL is broken and may not be used with Shorewall"
    fi

    if [ -z "$KLUDGEFREE" ]; then
	rm -f $TMP_DIR/physdev
	rm -f $TMP_DIR/iprange
    fi

    qt mywhich awk && HAVEAWK=Yes || HAVEAWK=
    #
    # Pre-process all of the standard files
    #
    # Because 'strip_file()' does shell variable expansion, we must first determine the
    # setting of $FW
    #
    case ${IPSECFILE:=ipsec} in
	ipsec)
	    [ -n "${FW:=fw}" ]
	    strip_file ipsec
	    ;;
	zones)
	    get_firewall_zone
	    ;;
	*)
	    startup_error "Invalid value ($IPSECFILE) for IPSECFILE option"
	    ;;
    esac

    strip_file zones
    strip_file routestopped
    strip_file interfaces
    strip_file hosts

    if [ $PROGRAM = compiler ]; then
	strip_file_and_lib_load accounting accounting

	if [ -n "$USE_ACTIONS" ]; then
	    strip_file actions
	    strip_file actions.std ${SHAREDIR}/actions.std
	fi
	    
	strip_file blacklist
	strip_file ecn
	strip_file maclist
	strip_file_and_lib_load masq nat
	strip_file_and_lib_load nat nat
	strip_file_and_lib_load netmap nat
	strip_file policy
	strip_file_and_lib_load providers providers && strip_file route_rules
	strip_file_and_lib_load proxyarp proxyarp
	strip_file rfc1918
	strip_file routestopped
	strip_file rules

	if [ "$TC_ENABLED" = Internal ]; then
	    strip_file_and_lib_load tcdevices tc
	    strip_file_and_lib_load tcclasses tc
	fi
	
	strip_file_and_lib_load tcrules tcrules
	strip_file tos
	strip_file_and_lib_load tunnels tunnels
    fi
    
    [ "$IPSECFILE" = zones ] && FW=
}