mirror of
https://gitlab.com/shorewall/code.git
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1180 lines
24 KiB
Plaintext
1180 lines
24 KiB
Plaintext
#
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# Shorewall 4.5 -- /usr/share/shorewall/lib.common.
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#
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# 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) 2010-2012 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# The purpose of this library is to hold those functions used by both the CLI and by the
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# generated firewall scripts. To avoid versioning issues, it is copied into generated
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# scripts rather than loaded at run-time.
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#
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#########################################################################################
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#
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# Conditionally produce message
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#
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progress_message() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -gt 1 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -gt 1 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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progress_message2() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -gt 0 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -gt 0 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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progress_message3() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -ge 0 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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#
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# Set a standard chain's policy
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#
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setpolicy() # $1 = name of chain, $2 = policy
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{
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run_iptables -P $1 $2
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}
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#
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# Generate a list of all network interfaces on the system
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#
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find_all_interfaces() {
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${IP:-ip} link list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
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}
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#
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# Generate a list of all network interfaces on the system that have an ipv4 address
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#
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find_all_interfaces1() {
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${IP:-ip} -$g_family addr list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
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}
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#
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# Find the value 'dev' in the passed arguments then echo the next value
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#
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find_device() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xdev ] && 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 value 'via' in the passed arguments then echo the next value
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#
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find_gateway() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xvia ] && 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 value 'mtu' in the passed arguments then echo the next value
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#
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find_mtu() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xmtu ] && 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 value 'peer' in the passed arguments then echo the next value up to
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# "/"
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#
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find_peer() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xpeer ] && 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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# Try to find the gateway through an interface looking for 'nexthop'
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find_nexthop() # $1 = interface
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{
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echo $(find_gateway `$IP -$g_family route list | grep "[[:space:]]nexthop.* $1"`)
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}
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#
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# Find the default route's interface
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#
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find_default_interface() {
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$IP -$g_family route list | while read first rest; do
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[ "$first" = default ] && echo $(find_device $rest) && return
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done
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}
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#
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# Determine if Interface is up
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#
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interface_is_up() {
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[ -n "$($IP -$g_family link list dev $1 2> /dev/null | grep -e '[<,]UP[,>]')" ]
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}
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#
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# Determine if interface is usable from a Netfilter prespective
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#
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interface_is_usable() # $1 = interface
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{
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[ "$1" = lo ] && return 0
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interface_is_up $1 && [ "$(find_first_interface_address_if_any $1)" != :: ] && run_isusable_exit $1
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}
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#
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# Find interface addresses--returns the set of addresses assigned to the passed
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# device
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#
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find_interface_addresses() # $1 = interface
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{
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if [ $g_family -eq 4 ]; then
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$IP -f inet addr show $1 2> /dev/null | grep inet\ | sed 's/\s*inet //;s/\/.*//;s/ peer.*//'
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else
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$IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 2' | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//'
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fi
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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 -$g_family 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 $1" >&2
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fi
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;;
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multicast|broadcast|prohibit|nat|throw|nexthop)
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;;
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[2-9]*)
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[ "$address" = "${address%/*}" ] && address="${address}/128"
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echo $address
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;;
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*)
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if [ $g_family -eq 4 ]; then
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[ "$address" = "${address%/*}" ] && address="${address}/128"
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echo $address
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fi
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;;
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esac
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done
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}
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#
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# Clear the current traffic shaping configuration
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#
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delete_tc1()
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{
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clear_one_tc() {
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$TC qdisc del dev $1 root 2> /dev/null
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$TC qdisc del dev $1 ingress 2> /dev/null
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}
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run_tcclear_exit
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run_ip link list | \
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while read inx interface details; do
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case $inx in
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[0-9]*)
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clear_one_tc ${interface%:}
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;;
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*)
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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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# Detect a device's MTU -- echos the passed device's MTU
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#
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get_device_mtu() # $1 = device
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{
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local output
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output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
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if [ -n "$output" ]; then
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echo $(find_mtu $output)
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else
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echo 1500
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fi
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}
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#
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# Version of the above that doesn't generate any output for MTU 1500.
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# Generates 'mtu <mtu+>' otherwise, where <mtu+> is the device's MTU + 100
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#
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get_device_mtu1() # $1 = device
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{
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local output
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output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
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local mtu
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if [ -n "$output" ]; then
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mtu=$(find_mtu $output)
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if [ -n "$mtu" ]; then
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[ $mtu = 1500 ] || echo mtu $(($mtu + 100))
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fi
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fi
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}
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#
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# Undo changes to routing
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#
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undo_routing() {
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local undofiles
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local f
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if [ -z "$g_noroutes" ]; then
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#
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# Restore rt_tables database
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#
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if [ -f ${VARDIR}/rt_tables ]; then
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[ -w /etc/iproute2/rt_table -a -z "$KEEP_RT_TABLES" ] && cp -f ${VARDIR}/rt_tables /etc/iproute2/ && progress_message "/etc/iproute2/rt_tables database restored"
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rm -f ${VARDIR}/rt_tables
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fi
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#
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# Restore the rest of the routing table
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#
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undofiles="$(ls ${VARDIR}/undo_*routing 2> /dev/null)"
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if [ -n "$undofiles" ]; then
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for f in $undofiles; do
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. $f
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done
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rm -f $undofiles
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progress_message "Shorewall-generated routing tables and routing rules removed"
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fi
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fi
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}
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#
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# Save the default route
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#
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save_default_route() {
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awk \
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'BEGIN {defroute=0;};
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/^default / {defroute=1; print; next};
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/nexthop/ {if (defroute == 1 ) {print ; next} };
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{ defroute=0; };'
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}
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#
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# Restore the default route that was in place before the initial 'shorewall start'
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#
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replace_default_route() # $1 = USE_DEFAULT_RT
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{
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#
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# default_route and result are inherited from the caller
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#
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if [ -n "$default_route" ]; then
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case "$default_route" in
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*metric*)
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#
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# Don't restore a default route with a metric unless USE_DEFAULT_RT=Yes. Otherwise, we only replace the one with metric 0
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#
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[ -n "$1" ] && qt $IP -$g_family route replace $default_route && progress_message "Default Route (${default_route# }) restored"
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default_route=
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;;
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*)
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qt $IP -$g_family route replace $default_route && progress_message "Default Route (${default_route# }) restored"
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result=0
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default_route=
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;;
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esac
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fi
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}
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restore_default_route() # $1 = USE_DEFAULT_RT
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{
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local result
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result=1
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if [ -z "$g_noroutes" -a -f ${VARDIR}/default_route ]; then
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local default_route
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default_route=
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local route
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while read route ; do
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case $route in
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default*)
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replace_default_route $1
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default_route="$default_route $route"
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;;
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*)
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default_route="$default_route $route"
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;;
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esac
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done < ${VARDIR}/default_route
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replace_default_route $1
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if [ $result = 1 ]; then
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#
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# We didn't restore a default route with metric 0
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#
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if $IP -$g_family -o route list 2> /dev/null | fgrep default | fgrep -qv metric; then
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#
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# But we added a default route with metric 0
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#
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qt $IP -$g_family route del default metric 0 && progress_message "Default route with metric 0 deleted"
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fi
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fi
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rm -f ${VARDIR}/default_route
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fi
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return $result
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}
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#
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# Flush the conntrack table if $g_purge is non-empty
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#
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conditionally_flush_conntrack() {
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if [ -n "$g_purge" ]; then
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if [ -n $(mywhich conntrack) ]; then
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conntrack -f ipv$_family -F
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else
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error_message "WARNING: The '-p' option requires the conntrack utility which does not appear to be installed on this system"
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fi
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fi
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}
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#
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# Issue a message and stop/restore the firewall
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#
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fatal_error()
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{
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echo " ERROR: $@" >&2
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%_b %d %T') "
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echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
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fi
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stop_firewall
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[ -n "$TEMPFILE" ] && rm -f $TEMPFILE
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exit 2
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}
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#
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# Issue a message and stop
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#
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startup_error() # $* = Error Message
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{
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echo " ERROR: $@: Firewall state not changed" >&2
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%_b %d %T') "
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echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
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fi
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case $COMMAND in
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start)
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logger -p kern.err "ERROR:$g_product start failed:Firewall state not changed"
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;;
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restart)
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logger -p kern.err "ERROR:$g_product restart failed:Firewall state not changed"
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;;
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restore)
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logger -p kern.err "ERROR:$g_product restore failed:Firewall state not changed"
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;;
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esac
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%_b %d %T') "
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case $COMMAND in
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start)
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echo "${timestamp} ERROR:$g_product start failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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restart)
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echo "${timestamp} ERROR:$g_product restart failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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restore)
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echo "${timestamp} ERROR:$g_product restore failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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esac
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fi
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kill $$
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exit 2
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}
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#
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# Run iptables and if an error occurs, stop/restore the firewall
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#
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run_iptables()
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{
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local status
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while [ 1 ]; do
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$g_tool $@
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status=$?
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[ $status -ne 4 ] && break
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done
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if [ $status -ne 0 ]; then
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error_message "ERROR: Command \"$g_tool $@\" Failed"
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stop_firewall
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exit 2
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fi
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}
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#
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# Run iptables retrying exit status 4
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#
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do_iptables()
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{
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local status
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while [ 1 ]; do
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$g_tool $@
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status=$?
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[ $status -ne 4 ] && return $status;
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done
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}
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#
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# Run iptables and if an error occurs, stop/restore the firewall
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#
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run_ip()
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{
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if ! $IP -$g_family $@; then
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error_message "ERROR: Command \"$IP -$g_family $@\" Failed"
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stop_firewall
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exit 2
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fi
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}
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|
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#
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# Run tc and if an error occurs, stop/restore the firewall
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#
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run_tc() {
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if ! $TC $@ ; then
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error_message "ERROR: Command \"$TC $@\" Failed"
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stop_firewall
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exit 2
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fi
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}
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|
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#
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# Get the Shorewall version of the passed script
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#
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get_script_version() { # $1 = script
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local temp
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local version
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local ifs
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local digits
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local verbosity
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verbosity="$VERBOSITY"
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VERBOSITY=0
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temp=$( $SHOREWALL_SHELL $1 version | sed 's/-.*//' )
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|
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if [ $? -ne 0 ]; then
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version=0
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else
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ifs=$IFS
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IFS=.
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temp=$(echo $temp)
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IFS=$ifs
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digits=0
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for temp in $temp; do
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version=${version}$(printf '%02d' $temp)
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digits=$(($digits + 1))
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[ $digits -eq 3 ] && break
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done
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fi
|
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|
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echo $version
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|
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VERBOSITY="$verbosity"
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}
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|
|
#
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|
# Do required exports or create the required option string and run the passed script using
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# $SHOREWALL_SHELL
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#
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|
run_it() {
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local script
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local options
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|
local version
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|
|
export VARDIR
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|
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script=$1
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shift
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|
|
version=$(get_script_version $script)
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|
|
if [ $version -lt 040408 ]; then
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#
|
|
# Old script that doesn't understand 4.4.8 script options
|
|
#
|
|
export RESTOREFILE
|
|
export VERBOSITY
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|
export NOROUTES=$g_noroutes
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|
export PURGE=$g_purge
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|
export TIMESTAMP=$g_timestamp
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|
export RECOVERING=$g_recovering
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|
|
|
case "$g_program" in
|
|
*-lite)
|
|
#
|
|
# Shorewall Lite
|
|
#
|
|
export LOGFORMAT
|
|
export IPTABLES
|
|
;;
|
|
esac
|
|
else
|
|
#
|
|
# 4.4.8 or later -- no additional exports required
|
|
#
|
|
if [ x$1 = xtrace -o x$1 = xdebug ]; then
|
|
options="$1 -"
|
|
shift;
|
|
else
|
|
options='-'
|
|
fi
|
|
|
|
[ -n "$g_noroutes" ] && options=${options}n
|
|
[ -n "$g_timestamp" ] && options=${options}t
|
|
[ -n "$g_purge" ] && options=${options}p
|
|
[ -n "$g_recovering" ] && options=${options}r
|
|
|
|
options="${options}V $VERBOSITY"
|
|
|
|
[ -n "$RESTOREFILE" ] && options="${options} -R $RESTOREFILE"
|
|
fi
|
|
|
|
$SHOREWALL_SHELL $script $options $@
|
|
}
|
|
|
|
#
|
|
# Message to stderr
|
|
#
|
|
error_message() # $* = Error Message
|
|
{
|
|
echo " $@" >&2
|
|
}
|
|
|
|
#
|
|
# Undo the effect of 'split()'
|
|
#
|
|
join()
|
|
{
|
|
local f
|
|
local o
|
|
o=
|
|
|
|
for f in $* ; do
|
|
o="${o:+$o:}$f"
|
|
done
|
|
|
|
echo $o
|
|
}
|
|
|
|
#
|
|
# Return the number of elements in a list
|
|
#
|
|
list_count() # $* = list
|
|
{
|
|
return $#
|
|
}
|
|
|
|
#
|
|
# Split a colon-separated list into a space-separated list
|
|
#
|
|
split() {
|
|
local ifs
|
|
ifs=$IFS
|
|
IFS=:
|
|
echo $*
|
|
IFS=$ifs
|
|
}
|
|
|
|
#
|
|
# Search a list looking for a match -- returns zero if a match found
|
|
# 1 otherwise
|
|
#
|
|
list_search() # $1 = element to search for , $2-$n = list
|
|
{
|
|
local e
|
|
e=$1
|
|
|
|
while [ $# -gt 1 ]; do
|
|
shift
|
|
[ "x$e" = "x$1" ] && return 0
|
|
done
|
|
|
|
return 1
|
|
}
|
|
|
|
#
|
|
# Suppress all output for a command
|
|
#
|
|
qt()
|
|
{
|
|
"$@" >/dev/null 2>&1
|
|
}
|
|
|
|
#
|
|
# Suppress all output and input - mainly for preventing leaked file descriptors
|
|
# to avoid SELinux denials
|
|
#
|
|
qtnoin()
|
|
{
|
|
"$@" </dev/null >/dev/null 2>&1
|
|
}
|
|
|
|
qt1()
|
|
{
|
|
local status
|
|
|
|
while [ 1 ]; do
|
|
"$@" </dev/null >/dev/null 2>&1
|
|
status=$?
|
|
[ $status -ne 4 ] && return $status
|
|
done
|
|
}
|
|
|
|
#
|
|
# Determine if Shorewall[6] is "running"
|
|
#
|
|
product_is_started() {
|
|
qt1 $g_tool -L shorewall -n
|
|
}
|
|
|
|
shorewall_is_started() {
|
|
qt1 $IPTABLES -L shorewall -n
|
|
}
|
|
|
|
shorewall6_is_started() {
|
|
qt1 $IP6TABLES -L shorewall -n
|
|
}
|
|
|
|
#
|
|
# Echos the fully-qualified name of the calling shell program
|
|
#
|
|
my_pathname() {
|
|
cd $(dirname $0)
|
|
echo $PWD/$(basename $0)
|
|
}
|
|
|
|
#
|
|
# Source a user exit file if it exists
|
|
#
|
|
run_user_exit() # $1 = file name
|
|
{
|
|
local user_exit
|
|
user_exit=$(find_file $1)
|
|
|
|
if [ -f $user_exit ]; then
|
|
progress_message "Processing $user_exit ..."
|
|
. $user_exit
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Load a Kernel Module -- assumes that the variable 'moduledirectories' contains
|
|
# a space-separated list of directories to search for
|
|
# the module and that 'moduleloader' contains the
|
|
# module loader command.
|
|
#
|
|
loadmodule() # $1 = module name, $2 - * arguments
|
|
{
|
|
local modulename
|
|
modulename=$1
|
|
local modulefile
|
|
local suffix
|
|
|
|
if [ -d /sys/module/ ]; then
|
|
if ! list_search $modulename $DONT_LOAD; then
|
|
if [ ! -d /sys/module/$modulename ]; then
|
|
shift
|
|
|
|
for suffix in $MODULE_SUFFIX ; do
|
|
for directory in $moduledirectories; do
|
|
modulefile=$directory/${modulename}.${suffix}
|
|
|
|
if [ -f $modulefile ]; then
|
|
case $moduleloader in
|
|
insmod)
|
|
insmod $modulefile $*
|
|
;;
|
|
*)
|
|
modprobe $modulename $*
|
|
;;
|
|
esac
|
|
break 2
|
|
fi
|
|
done
|
|
done
|
|
fi
|
|
fi
|
|
elif ! list_search $modulename $DONT_LOAD $MODULES; then
|
|
shift
|
|
|
|
for suffix in $MODULE_SUFFIX ; do
|
|
for directory in $moduledirectories; do
|
|
modulefile=$directory/${modulename}.${suffix}
|
|
|
|
if [ -f $modulefile ]; then
|
|
case $moduleloader in
|
|
insmod)
|
|
insmod $modulefile $*
|
|
;;
|
|
*)
|
|
modprobe $modulename $*
|
|
;;
|
|
esac
|
|
break 2
|
|
fi
|
|
done
|
|
done
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Reload the Modules
|
|
#
|
|
reload_kernel_modules() {
|
|
|
|
local save_modules_dir
|
|
save_modules_dir=$MODULESDIR
|
|
local directory
|
|
local moduledirectories
|
|
moduledirectories=
|
|
local moduleloader
|
|
moduleloader=modprobe
|
|
local uname
|
|
|
|
if ! qt mywhich modprobe; then
|
|
moduleloader=insmod
|
|
fi
|
|
|
|
[ -n "${MODULE_SUFFIX:=ko ko.gz o o.gz gz}" ]
|
|
|
|
[ -z "$MODULESDIR" ] && \
|
|
uname=$(uname -r) && \
|
|
MODULESDIR=/lib/modules/$uname/kernel/net/ipv${g_family}/netfilter:/lib/modules/$uname/kernel/net/netfilter:/lib/modules/$uname/kernel/net/sched:/lib/modules/$uname/extra:/lib/modules/$uname/extra/ipset
|
|
|
|
[ -d /sys/module/ ] || MODULES=$(lsmod | cut -d ' ' -f1)
|
|
|
|
for directory in $(split $MODULESDIR); do
|
|
[ -d $directory ] && moduledirectories="$moduledirectories $directory"
|
|
done
|
|
|
|
[ -n "$moduledirectories" ] && while read command; do
|
|
eval $command
|
|
done
|
|
|
|
MODULESDIR=$save_modules_dir
|
|
}
|
|
|
|
#
|
|
# Load kernel modules required for Shorewall
|
|
#
|
|
load_kernel_modules() # $1 = Yes, if we are to save moduleinfo in $VARDIR
|
|
{
|
|
local save_modules_dir
|
|
save_modules_dir=$MODULESDIR
|
|
local directory
|
|
local moduledirectories
|
|
moduledirectories=
|
|
local moduleloader
|
|
moduleloader=modprobe
|
|
local savemoduleinfo
|
|
savemoduleinfo=${1:-Yes} # So old compiled scripts still work
|
|
local uname
|
|
|
|
if ! qt mywhich modprobe; then
|
|
moduleloader=insmod
|
|
fi
|
|
|
|
[ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ]
|
|
|
|
[ -z "$MODULESDIR" ] && \
|
|
uname=$(uname -r) && \
|
|
MODULESDIR=/lib/modules/$uname/kernel/net/ipv${g_family}/netfilter:/lib/modules/$uname/kernel/net/netfilter:/lib/modules/$uname/kernel/net/sched:/lib/modules/$uname/extra:/lib/modules/$uname/extra/ipset
|
|
|
|
for directory in $(split $MODULESDIR); do
|
|
[ -d $directory ] && moduledirectories="$moduledirectories $directory"
|
|
done
|
|
|
|
[ -n "$LOAD_HELPERS_ONLY" ] && modules=$(find_file helpers) || modules=$(find_file modules)
|
|
|
|
if [ -f $modules -a -n "$moduledirectories" ]; then
|
|
[ -d /sys/module/ ] || MODULES=$(lsmod | cut -d ' ' -f1)
|
|
progress_message "Loading Modules..."
|
|
. $modules
|
|
if [ $savemoduleinfo = Yes ]; then
|
|
[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
|
|
echo MODULESDIR="$MODULESDIR" > ${VARDIR}/.modulesdir
|
|
cp -f $modules ${VARDIR}/.modules
|
|
fi
|
|
elif [ $savemoduleinfo = Yes ]; then
|
|
[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
|
|
> ${VARDIR}/.modulesdir
|
|
> ${VARDIR}/.modules
|
|
fi
|
|
|
|
MODULESDIR=$save_modules_dir
|
|
}
|
|
|
|
#
|
|
# Note: The following set of IP address manipulation functions have anomalous
|
|
# behavior when the shell only supports 32-bit signed arithmetic and
|
|
# the IP address is 128.0.0.0 or 128.0.0.1.
|
|
#
|
|
|
|
LEFTSHIFT='<<'
|
|
|
|
#
|
|
# Convert an IP address in dot quad format to an integer
|
|
#
|
|
decodeaddr() {
|
|
local x
|
|
local temp
|
|
temp=0
|
|
local ifs
|
|
ifs=$IFS
|
|
|
|
IFS=.
|
|
|
|
for x in $1; do
|
|
temp=$(( $(( $temp $LEFTSHIFT 8 )) | $x ))
|
|
done
|
|
|
|
echo $temp
|
|
|
|
IFS=$ifs
|
|
}
|
|
|
|
#
|
|
# convert an integer to dot quad format
|
|
#
|
|
encodeaddr() {
|
|
addr=$1
|
|
local x
|
|
local y
|
|
y=$(($addr & 255))
|
|
|
|
for x in 1 2 3 ; do
|
|
addr=$(($addr >> 8))
|
|
y=$(($addr & 255)).$y
|
|
done
|
|
|
|
echo $y
|
|
}
|
|
|
|
#
|
|
# Netmask from CIDR
|
|
#
|
|
ip_netmask() {
|
|
local vlsm
|
|
vlsm=${1#*/}
|
|
|
|
[ $vlsm -eq 0 ] && echo 0 || echo $(( -1 $LEFTSHIFT $(( 32 - $vlsm )) ))
|
|
}
|
|
|
|
#
|
|
# Network address from CIDR
|
|
#
|
|
ip_network() {
|
|
local decodedaddr
|
|
decodedaddr=$(decodeaddr ${1%/*})
|
|
local netmask
|
|
netmask=$(ip_netmask $1)
|
|
|
|
echo $(encodeaddr $(($decodedaddr & $netmask)))
|
|
}
|
|
|
|
#
|
|
# The following hack is supplied to compensate for the fact that many of
|
|
# the popular light-weight Bourne shell derivatives don't support XOR ("^").
|
|
#
|
|
ip_broadcast() {
|
|
local x
|
|
x=$(( 32 - ${1#*/} ))
|
|
|
|
[ $x -eq 32 ] && echo -1 || echo $(( $(( 1 $LEFTSHIFT $x )) - 1 ))
|
|
}
|
|
|
|
#
|
|
# Calculate broadcast address from CIDR
|
|
#
|
|
broadcastaddress() {
|
|
local decodedaddr
|
|
decodedaddr=$(decodeaddr ${1%/*})
|
|
local netmask
|
|
netmask=$(ip_netmask $1)
|
|
local broadcast
|
|
broadcast=$(ip_broadcast $1)
|
|
|
|
echo $(encodeaddr $(( $(($decodedaddr & $netmask)) | $broadcast )))
|
|
}
|
|
|
|
#
|
|
# Test for network membership
|
|
#
|
|
in_network() # $1 = IP address, $2 = CIDR network
|
|
{
|
|
local netmask
|
|
netmask=$(ip_netmask $2)
|
|
#
|
|
# Use string comparison to work around a broken BusyBox ash in OpenWRT
|
|
#
|
|
test $(( $(decodeaddr $1) & $netmask)) = $(( $(decodeaddr ${2%/*}) & $netmask ))
|
|
}
|
|
|
|
#
|
|
# Query NetFilter about the existence of a filter chain
|
|
#
|
|
chain_exists() # $1 = chain name
|
|
{
|
|
qt1 $g_tool -L $1 -n
|
|
}
|
|
|
|
#
|
|
# Find the interface with the passed MAC address
|
|
#
|
|
|
|
find_interface_by_mac() {
|
|
local mac
|
|
mac=$1
|
|
local first
|
|
local second
|
|
local rest
|
|
local dev
|
|
|
|
$IP link list | while read first second rest; do
|
|
case $first in
|
|
*:)
|
|
dev=$second
|
|
;;
|
|
*)
|
|
if [ "$second" = $mac ]; then
|
|
echo ${dev%:}
|
|
return
|
|
fi
|
|
esac
|
|
done
|
|
}
|
|
|
|
#
|
|
# Find interface address--returns the first IP address assigned to the passed
|
|
# device
|
|
#
|
|
find_first_interface_address() # $1 = interface
|
|
{
|
|
if [ $g_family -eq 4 ]; then
|
|
#
|
|
# get the line of output containing the first IP address
|
|
#
|
|
addr=$(${IP:-ip} -$g_family addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
|
|
#
|
|
# If there wasn't one, bail out now
|
|
#
|
|
[ -n "$addr" ] || startup_error "Can't determine the IP address of $1"
|
|
#
|
|
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
|
|
# along with everything else on the line
|
|
#
|
|
echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//'
|
|
else
|
|
#
|
|
# get the line of output containing the first IP address
|
|
#
|
|
addr=$(${IP:-ip} -f inet6 addr show dev $1 2> /dev/null | fgrep 'inet6 ' | fgrep -v 'scope link' | head -n1)
|
|
#
|
|
# If there wasn't one, bail out now
|
|
#
|
|
[ -n "$addr" ] || startup_error "Can't determine the IPv6 address of $1"
|
|
#
|
|
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
|
|
# along with everything else on the line
|
|
#
|
|
echo $addr | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//'
|
|
fi
|
|
}
|
|
|
|
find_first_interface_address_if_any() # $1 = interface
|
|
{
|
|
if [ $g_family -eq 4 ]; then
|
|
#
|
|
# get the line of output containing the first IP address
|
|
#
|
|
addr=$(${IP:-ip} -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
|
|
#
|
|
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
|
|
# along with everything else on the line
|
|
#
|
|
[ -n "$addr" ] && echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//' || echo 0.0.0.0
|
|
else
|
|
#
|
|
# get the line of output containing the first IP address
|
|
#
|
|
addr=$(${IP:-ip} -f inet6 addr show dev $1 2> /dev/null | fgrep 'inet6 ' | fgrep -v 'scope link' | head -n1)
|
|
#
|
|
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
|
|
# along with everything else on the line
|
|
#
|
|
[ -n "$addr" ] && echo $addr | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//' || echo ::
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Internal version of 'which'
|
|
#
|
|
mywhich() {
|
|
local dir
|
|
|
|
for dir in $(split $PATH); do
|
|
if [ -x $dir/$1 ]; then
|
|
echo $dir/$1
|
|
return 0
|
|
fi
|
|
done
|
|
|
|
return 2
|
|
}
|
|
|
|
#
|
|
# Find a File -- For relative file name, look in each ${CONFIG_PATH} then ${CONFDIR}
|
|
#
|
|
find_file()
|
|
{
|
|
local saveifs
|
|
saveifs=
|
|
local directory
|
|
|
|
case $1 in
|
|
/*)
|
|
echo $1
|
|
;;
|
|
*)
|
|
for directory in $(split $CONFIG_PATH); do
|
|
if [ -f $directory/$1 ]; then
|
|
echo $directory/$1
|
|
return
|
|
fi
|
|
done
|
|
|
|
echo ${CONFDIR}/$1
|
|
;;
|
|
esac
|
|
}
|
|
|
|
#
|
|
# Set the Shorewall state
|
|
#
|
|
set_state () # $1 = state
|
|
{
|
|
if [ $# -gt 1 ]; then
|
|
echo "$1 ($(date)) from $2" > ${VARDIR}/state
|
|
else
|
|
echo "$1 ($(date))" > ${VARDIR}/state
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Perform variable substitution on the passed argument and echo the result
|
|
#
|
|
expand() # $@ = contents of variable which may be the name of another variable
|
|
{
|
|
eval echo \"$@\"
|
|
}
|
|
|
|
#
|
|
# Function for including one file into another
|
|
#
|
|
INCLUDE() {
|
|
. $(find_file $(expand $@))
|
|
}
|
|
|
|
# Function to truncate a string -- It uses 'cut -b -<n>'
|
|
# rather than ${v:first:last} because light-weight shells like ash and
|
|
# dash do not support that form of expansion.
|
|
#
|
|
|
|
truncate() # $1 = length
|
|
{
|
|
cut -b -${1}
|
|
}
|
|
|