shorewall_code/New/prog.functions

#
# Clear Proxy Arp
#
delete_proxyarp() {
    if [ -f ${VARDIR}/proxyarp ]; then
	while read address interface external haveroute; do
	    qt arp -i $external -d $address pub
	    [ -z "${haveroute}${NOROUTES}" ] && qt ip route del $address dev $interface
	done < ${VARDIR}/proxyarp

	for f in /proc/sys/net/ipv4/conf/*; do
	    [ -f $f/proxy_arp ] && echo 0 > $f/proxy_arp
	done
    fi

    rm -f ${VARDIR}/proxyarp
}

#
# Stop/restore the firewall after an error or because of a "stop" or "clear" command
#
stop_firewall() {

    deletechain() {
	qt $IPTABLES -L $1 -n && qt $IPTABLES -F $1 && qt $IPTABLES -X $1
    }

    deleteallchains() {
	$IPTABLES -F
	$IPTABLES -X
    }

    setcontinue() {
	$IPTABLES -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT
    }

    delete_nat() {
	$IPTABLES -t nat -F
	$IPTABLES -t nat -X

	if [ -f ${VARDIR}/nat ]; then
	    while read external interface; do
		del_ip_addr $external $interface
	    done < ${VARDIR}/nat

	    rm -f ${VARDIR}/nat
	fi
    }

    case $COMMAND in
	stop|clear)
	    ;;
	*)
	    set +x

            case $COMMAND in
	        start)
	            logger -p kern.err "ERROR:$PRODUCT start failed"
	            ;;
	        restart)
	            logger -p kern.err "ERROR:$PRODUCT restart failed"
	            ;;
	        restore)
	            logger -p kern.err "ERROR:$PRODUCT restore failed"
	            ;;
            esac
            
            if [ "$RESTOREFILE" = NONE ]; then
                COMMAND=clear
                clear_firewall
                echo "$PRODUCT Cleared"

	        kill $$
	        exit 2
            else
	        RESTOREPATH=${VARDIR}/$RESTOREFILE

	        if [ -x $RESTOREPATH ]; then

		    if [ -x ${RESTOREPATH}-ipsets ]; then
		        progress_message2 Restoring Ipsets...
		        #
		        # We must purge iptables to be sure that there are no
		        # references to ipsets
		        #
		        for table in mangle nat filter; do
			    $IPTABLES -t $table -F
			    $IPTABLES -t $table -X
		        done

		        ${RESTOREPATH}-ipsets
		    fi

		    echo Restoring ${PRODUCT:=Shorewall}...

		    if $RESTOREPATH restore; then
		        echo "$PRODUCT restored from $RESTOREPATH"
		        set_state "Started"
		    else
		        set_state "Unknown"
		    fi

	            kill $$
	            exit 2
	        fi
            fi
	    ;;
    esac

    set_state "Stopping"

    STOPPING="Yes"

    TERMINATOR=

    deletechain shorewall

    determine_capabilities

    run_stop_exit

    if [ -n "$MANGLE_ENABLED" ]; then
	run_iptables -t mangle -F
	run_iptables -t mangle -X
	for chain in PREROUTING INPUT FORWARD POSTROUTING; do
	    qt $IPTABLES -t mangle -P $chain ACCEPT
	done
    fi

    if [ -n "$RAW_TABLE" ]; then
	run_iptables -t raw -F
	run_iptables -t raw -X
	for chain in PREROUTING OUTPUT; do
	    qt $IPTABLES -t raw -P $chain ACCEPT
	done
    fi

    if [ -n "$NAT_ENABLED" ]; then
	delete_nat
	for chain in PREROUTING POSTROUTING OUTPUT; do
	    qt $IPTABLES -t nat -P $chain ACCEPT
	done
    fi

    delete_proxyarp

    [ -n "$CLEAR_TC" ] && delete_tc1

    [ -n "$DISABLE_IPV6" ] && disable_ipv6

    undo_routing

    restore_default_route
    #
    # Fixme -- CRITICALHOSTS handling broken
    #
    if [ -n "$CRITICALHOSTS" ]; then
	if [ -z "$ADMINISABSENTMINDED" ]; then

	    for chain in INPUT OUTPUT; do
		setpolicy $chain ACCEPT
	    done

	    setpolicy FORWARD DROP

	    deleteallchains
		
	    for host in $CRITICALHOSTS; do
		interface=${host%:*}
		networks=${host#*:}
		$IPTABLES -A INPUT  -i $interface $(source_ip_range $networks) -j ACCEPT
		$IPTABLES -A OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT
	    done

	    for chain in INPUT OUTPUT; do
		setpolicy $chain DROP
	    done
	else
	    for chain in INPUT OUTPUT; do
		setpolicy $chain ACCEPT
	    done

	    setpolicy FORWARD DROP

	    deleteallchains

	    for host in $CRITICALHOSTS; do
		interface=${host%:*}
		networks=${host#*:}
		$IPTABLES -A INPUT  -i $interface $(source_ip_range $networks) -j ACCEPT
		$IPTABLES -A OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT
	    done

	    setpolicy INPUT DROP

	    for chain in INPUT FORWARD; do
		setcontinue $chain
	    done
	fi
    elif [ -z "$ADMINISABSENTMINDED" ]; then
	for chain in INPUT OUTPUT FORWARD; do
	    setpolicy $chain DROP
	done

	deleteallchains
    else
	for chain in INPUT FORWARD; do
	    setpolicy $chain DROP
	done

	setpolicy OUTPUT ACCEPT

	deleteallchains

	for chain in INPUT FORWARD; do
	    setcontinue $chain
	done
    fi

    $IPTABLES -A INPUT  -i lo -j ACCEPT

    [ -z "$ADMINISABSENTMINDED" ] && $IPTABLES -A OUTPUT -o lo -j ACCEPT

    for interface in $DHCP_INTERFACES; do
	$IPTABLES -A INPUT  -p udp -i $interface --dport 67:68 -j ACCEPT
	[ -z "$ADMINISABSENTMINDED" ] && $IPTABLES -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT
	#
	# This might be a bridge
	#
	$IPTABLES -A FORWARD -p udp -i $interface -o $interface --dport 67:68 -j ACCEPT
    done

    case "$IP_FORWARDING" in
	On|on|ON)
	    echo 1 > /proc/sys/net/ipv4/ip_forward
	    progress_message2 IP Forwarding Enabled
	    ;;
	Off|off|OFF)
	    echo 0 > /proc/sys/net/ipv4/ip_forward
	    progress_message2 IP Forwarding Disabled!
	    ;;
    esac

    run_stopped_exit

    set_state "Stopped"

    logger -p kern.info "$PRODUCT Stopped"

    case $COMMAND in
    stop|clear)
	;;
    *)
	#
	# The firewall is being stopped when we were trying to do something
	# else. Remove the lock file and Kill the shell in case we're in a
	# subshell
	#
	kill $$
	;;
    esac
}

#
# Set policy of chain $1 to $2
#
setpolicy() {
    $IPTABLES -P $1 $2
}
#
# Remove all Shorewall-added rules
#
clear_firewall() {
    stop_firewall

    setpolicy INPUT ACCEPT
    setpolicy FORWARD ACCEPT
    setpolicy OUTPUT ACCEPT

    run_iptables -F

    echo 1 > /proc/sys/net/ipv4/ip_forward

    if [ -n "$DISABLE_IPV6" ]; then
	if qt mywhich ip6tables; then
	    ip6tables -P INPUT   ACCEPT 2> /dev/null
	    ip6tables -P OUTPUT  ACCEPT 2> /dev/null
	    ip6tables -P FORWARD ACCEPT 2> /dev/null
	fi
    fi

    run_clear_exit

    set_state "Cleared"

    logger -p kern.info "$PRODUCT Cleared"
}

#
# Issue a message and stop/restore the firewall
#
fatal_error()
{
    echo "   ERROR: $@" >&2
    stop_firewall
    exit 2
}

#
# Issue a message and stop
#
startup_error() # $* = Error Message
{
    echo "   ERROR: $@" >&2
    case $COMMAND in
        start)
	    logger -p kern.err "ERROR:$PRODUCT start failed"
	    ;;
	restart)
	    logger -p kern.err "ERROR:$PRODUCT restart failed"
	    ;;
	restore)
	    logger -p kern.err "ERROR:$PRODUCT restore failed"
	    ;;
    esac
            
    kill $$
    exit 2
}

#
# Run iptables and if an error occurs, stop/restore the firewall
#
run_iptables()
{
    if [ -n "$COMMENT" ]; then
        $IPTABLES $@ -m comment --comment "$COMMENT"
    else
        $IPTABLES $@
    fi

    if [ $? -ne 0 ]; then
        error_message "ERROR: Command \"$IPTABLES $@\" Failed"
	stop_firewall
        exit 2
    fi
}

#
# Run iptables and if an error occurs, stop/restore the firewall
#
run_ip()
{
    if ! ip $@; then
	error_message "ERROR: Command \"ip $@\" Failed"
	stop_firewall
	exit 2
    fi
}

#
# Run tc and if an error occurs, stop/restore the firewall
#
run_tc() {
    if ! tc $@ ; then
	error_message "ERROR: Command \"tc $@\" Failed"
	stop_firewall
	exit 2
    fi
}

#
# Functions to appease unconverted extension scripts
#
save_command()
{
    return 0
}

run_and_save_command() {
    eval $@
}

ensure_and_save_command() {
    eval $@ || fatal_error "Command \"$@\" failed"
}

restore_dynamic_rules() {
    if [ -f ${VARDIR}/save ]; then
	progress_message2 "Setting up dynamic rules..."
	rangematch='source IP range'
	while read target ignore1 ignore2 address ignore3 rest; do
	    case $target in
		DROP|reject|logdrop|logreject)
		    case $rest in
			$rangematch*)
			    run_iptables -A dynamic -m iprange --src-range ${rest#source IP range} -j $target
			    ;;
			*)
			    if [ -z "$rest" ]; then
				run_iptables -A dynamic -s $address -j $target
			    else
				error_message "WARNING: Unable to restore dynamic rule \"$target $ignore1 $ignore2 $address $ignore3 $rest\""
			    fi
			    ;;
		    esac
		    ;;
	    esac
	done < ${VARDIR}/save
    fi
}