forked from extern/shorewall_code
403 lines
9.6 KiB
Plaintext
403 lines
9.6 KiB
Plaintext
# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 1999-2011 - Tom Eastep (teastep@shorewall.net)
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#
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# Options are:
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#
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# -n Don't alter Routing
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# -v and -q Standard Shorewall Verbosity control
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# -t Timestamp progress messages
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# -p Purge conntrack table
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# -r Recover from failed start/restart
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# -V <verbosity> Set verbosity level explicitly
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# -R <restore> Overrides RESTOREFILE setting
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#
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# Commands are:
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#
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# start Starts the firewall
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# refresh Refresh the firewall
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# restart Restarts the firewall
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# reload Reload the firewall
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# clear Removes all firewall rules
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# stop Stops the firewall
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# status Displays firewall status
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# version Displays the version of Shorewall that
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# generated this program
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#
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################################################################################
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# Functions imported from /usr/share/shorewall/prog.header
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################################################################################
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#
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# Find the value 'weight' in the passed arguments then echo the next value
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#
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find_weight() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xweight ] && echo $2 && return
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shift
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done
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}
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#
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# Find the interfaces that have a route to the passed address - the default
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# route is not used.
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#
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find_rt_interface() {
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$IP -4 route list | while read addr rest; do
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case $addr in
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*/*)
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in_network ${1%/*} $addr && echo $(find_device $rest)
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;;
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default)
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;;
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*)
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if [ "$addr" = "$1" -o "$addr/32" = "$1" ]; then
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echo $(find_device $rest)
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fi
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;;
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esac
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done
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}
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#
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# Echo the name of the interface(s) that will be used to send to the
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# passed address
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#
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find_interface_by_address() {
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local dev
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dev="$(find_rt_interface $1)"
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local first
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local rest
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[ -z "$dev" ] && dev=$(find_default_interface)
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[ -n "$dev" ] && echo $dev
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}
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#
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# echo the list of networks routed out of a given interface
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#
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get_routed_networks() # $1 = interface name, $2-n = Fatal error message
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{
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local address
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local rest
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$IP -4 route show dev $1 2> /dev/null |
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while read address rest; do
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case "$address" in
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default)
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if [ $# -gt 1 ]; then
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shift
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fatal_error "$@"
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else
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echo "WARNING: default route ignored on interface $1" >&2
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fi
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;;
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multicast|broadcast|prohibit|nat|throw|nexthop)
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;;
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*)
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[ "$address" = "${address%/*}" ] && address="${address}/32"
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echo $address
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;;
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esac
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done
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}
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#
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# Get the broadcast addresses associated with an interface
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#
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get_interface_bcasts() # $1 = interface
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{
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local addresses
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addresses=
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$IP -f inet addr show dev $1 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u
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}
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#
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# Delete IP address
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#
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del_ip_addr() # $1 = address, $2 = interface
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{
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[ $(find_first_interface_address_if_any $2) = $1 ] || qtnoin $IP addr del $1 dev $2
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}
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# Add IP Aliases
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#
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add_ip_aliases() # $* = List of addresses
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{
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local local
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local addresses
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local external
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local interface
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local inet
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local cidr
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local rest
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local val
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local arping
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arping=$(mywhich arping)
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address_details()
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{
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#
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# Folks feel uneasy if they don't see all of the same
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# decoration on these IP addresses that they see when their
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# distro's net config tool adds them. In an attempt to reduce
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# the anxiety level, we have the following code which sets
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# the VLSM and BRD from an existing address in the same networks
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#
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# Get all of the lines that contain inet addresses with broadcast
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#
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$IP -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | while read inet cidr rest ; do
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case $cidr in
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*/*)
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if in_network $external $cidr; then
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echo "/${cidr#*/} brd $(broadcastaddress $cidr)"
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break
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fi
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;;
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esac
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done
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}
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do_one()
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{
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val=$(address_details)
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$IP addr add ${external}${val} dev $interface $label
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[ -n "$arping" ] && qt $arping -U -c 2 -I $interface $external
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echo "$external $interface" >> $VARDIR/nat
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[ -n "$label" ] && label="with $label"
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progress_message " IP Address $external added to interface $interface $label"
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}
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progress_message "Adding IP Addresses..."
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while [ $# -gt 0 ]; do
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external=$1
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interface=$2
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label=
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if [ "$interface" != "${interface%:*}" ]; then
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label="${interface#*:}"
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interface="${interface%:*}"
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label="label $interface:$label"
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fi
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shift 2
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list_search $external $(find_interface_addresses $interface) || do_one
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done
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}
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#
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# Detect the gateway through a PPP or DHCP-configured interface
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#
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detect_dynamic_gateway() { # $1 = interface
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local interface
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interface=$1
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local GATEWAYS
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GATEWAYS=
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local gateway
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gateway=$(run_findgw_exit $1);
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if [ -z "$gateway" ]; then
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gateway=$( find_peer $($IP addr list $interface ) )
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fi
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if [ -z "$gateway" -a -f /var/lib/dhcpcd/dhcpcd-${1}.info ]; then
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eval $(grep ^GATEWAYS= /var/lib/dhcpcd/dhcpcd-${1}.info 2> /dev/null)
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[ -n "$GATEWAYS" ] && GATEWAYS=${GATEWAYS%,*} && gateway=$GATEWAYS
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fi
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if [ -z "$gateway" -a -f /var/lib/dhcp/dhclient-${1}.lease ]; then
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gateway=$(grep 'option routers' /var/lib/dhcp/dhclient-${1}.lease | tail -n 1 | while read j1 j2 gateway; do echo $gateway ; return 0; done)
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fi
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[ -n "$gateway" ] && echo $gateway
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}
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#
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# Detect the gateway through an interface
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#
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detect_gateway() # $1 = interface
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{
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local interface
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interface=$1
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local gateway
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#
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# First assume that this is some sort of dynamic interface
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#
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gateway=$( detect_dynamic_gateway $interface )
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#
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# Maybe there's a default route through this gateway already
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#
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[ -n "$gateway" ] || gateway=$(find_gateway $($IP -4 route list dev $interface | grep ^default))
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#
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# Last hope -- is there a load-balancing route through the interface?
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#
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[ -n "$gateway" ] || gateway=$(find_nexthop $interface)
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#
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# Be sure we found one
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#
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[ -n "$gateway" ] && echo $gateway
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}
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#
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# Disable IPV6
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#
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disable_ipv6() {
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local foo
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foo="$($IP -f inet6 addr list 2> /dev/null)"
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if [ -n "$foo" ]; then
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if [ -x "$IP6TABLES" ]; then
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$IP6TABLES -P FORWARD DROP
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$IP6TABLES -P INPUT DROP
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$IP6TABLES -P OUTPUT DROP
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$IP6TABLES -F
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$IP6TABLES -X
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$IP6TABLES -A OUTPUT -o lo -j ACCEPT
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$IP6TABLES -A INPUT -i lo -j ACCEPT
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else
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error_message "WARNING: DISABLE_IPV6=Yes in shorewall.conf but this system does not appear to have ip6tables"
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fi
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fi
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}
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#
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# Add an additional gateway to the default route
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#
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add_gateway() # $1 = Delta $2 = Table Number
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{
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local route
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local weight
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local delta
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local dev
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route=`$IP -4 -o route ls table $2 | grep ^default | sed 's/default //; s/[\]//g'`
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if [ -z "$route" ]; then
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run_ip route add default scope global table $2 $1
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else
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delta=$1
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if ! echo $route | fgrep -q ' nexthop '; then
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route=`echo $route | sed 's/via/nexthop via/'`
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dev=$(find_device $route)
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if [ -f ${VARDIR}/${dev}_weight ]; then
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weight=`cat ${VARDIR}/${dev}_weight`
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route="$route weight $weight"
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fi
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fi
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run_ip route replace default scope global table $2 $route $delta
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fi
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}
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#
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# Remove a gateway from the default route
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#
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delete_gateway() # $! = Description of the Gateway $2 = table number $3 = device
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{
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local route
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local gateway
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local dev
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route=`$IP -4 -o route ls table $2 | grep ^default | sed 's/[\]//g'`
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gateway=$1
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if [ -n "$route" ]; then
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if echo $route | fgrep -q ' nexthop '; then
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gateway="nexthop $gateway"
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eval route=\`echo $route \| sed \'s/$gateway/ /\'\`
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run_ip route replace table $2 $route
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else
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dev=$(find_device $route)
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[ "$dev" = "$3" ] && run_ip route delete default table $2
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fi
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fi
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}
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#
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# Determine the MAC address of the passed IP through the passed interface
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#
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find_mac() # $1 = IP address, $2 = interface
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{
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if interface_is_usable $2 ; then
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qt ping -nc 1 -t 2 -I $2 $1
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local result
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result=$($IP neigh list | awk "/^$1 / {print \$5}")
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case $result in
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\<*\>)
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;;
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*)
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[ -n "$result" ] && echo $result
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;;
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esac
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fi
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}
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#
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# Clear Proxy Arp
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#
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delete_proxyarp() {
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if [ -f ${VARDIR}/proxyarp ]; then
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while read address interface external haveroute; do
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qtnoin $IP -4 neigh del proxy $address dev $external
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[ -z "${haveroute}${g_noroutes}" ] && qtnoin $IP -4 route del $address/32 dev $interface
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f=/proc/sys/net/ipv4/conf/$interface/proxy_arp
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[ -f $f ] && echo 0 > $f
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done < ${VARDIR}/proxyarp
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rm -f ${VARDIR}/proxyarp
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fi
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}
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#
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# Remove all Shorewall-added rules
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#
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clear_firewall() {
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stop_firewall
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setpolicy INPUT ACCEPT
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setpolicy FORWARD ACCEPT
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setpolicy OUTPUT ACCEPT
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run_iptables -F
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qt $IPTABLES -t raw -F
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echo 1 > /proc/sys/net/ipv4/ip_forward
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if [ -n "$DISABLE_IPV6" ]; then
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if [ -x $IP6TABLES ]; then
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$IP6TABLES -P INPUT ACCEPT 2> /dev/null
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$IP6TABLES -P OUTPUT ACCEPT 2> /dev/null
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$IP6TABLES -P FORWARD ACCEPT 2> /dev/null
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fi
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fi
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run_clear_exit
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set_state "Cleared"
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logger -p kern.info "$g_product Cleared"
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}
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#
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# Get a list of all configured broadcast addresses on the system
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#
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get_all_bcasts()
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{
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$IP -f inet addr show 2> /dev/null | grep 'inet.*brd' | grep -v '/32 ' | sed 's/inet.*brd //; s/scope.*//;' | sort -u
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}
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################################################################################
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# End of functions in /usr/share/shorewall/prog.header
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################################################################################
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