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shorewall_code/Shorewall/Perl/prog.header6

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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
# (c) 1999-2009 - Tom Eastep (teastep@shorewall.net)
#
# Options are:
#
# -n Don't alter Routing
# -v and -q Standard Shorewall Verbosity control
#
# Commands are:
#
# start Starts the firewall
# refresh Refresh the firewall
# restart Restarts the firewall
# reload Reload the firewall
# clear Removes all firewall rules
# stop Stops the firewall
# status Displays firewall status
# version Displays the version of Shorewall that
# generated this program
#
################################################################################
# Functions imported from /usr/share/shorewall/prog.header6
################################################################################
#
# Message to stderr
#
error_message() # $* = Error Message
{
echo " $@" >&2
}
#
# Conditionally produce message
#
progress_message() # $* = Message
{
local timestamp
timestamp=
if [ $VERBOSE -gt 1 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
if [ $LOG_VERBOSE -gt 1 ]; then
timestamp="$(date +'%b %_d %T') "
echo "${timestamp}$@" >> $STARTUP_LOG
fi
}
progress_message2() # $* = Message
{
local timestamp
timestamp=
if [ $VERBOSE -gt 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
if [ $LOG_VERBOSE -gt 0 ]; then
timestamp="$(date +'%b %_d %T') "
echo "${timestamp}$@" >> $STARTUP_LOG
fi
}
progress_message3() # $* = Message
{
local timestamp
timestamp=
if [ $VERBOSE -ge 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
if [ $LOG_VERBOSE -ge 0 ]; then
timestamp="$(date +'%b %_d %T') "
echo "${timestamp}$@" >> $STARTUP_LOG
fi
}
#
# Split a colon-separated list into a space-separated list
#
split() {
local ifs
ifs=$IFS
IFS=:
echo $*
IFS=$ifs
}
#
# 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 $#
}
#
# 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
}
qt1()
{
local status
while [ 1 ]; do
"$@" >/dev/null 2>&1
status=$?
[ $status -ne 4 ] && return $status
done
}
#
# Determine if Shorewall is "running"
#
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
}
#
# Set a standard chain's policy
#
setpolicy() # $1 = name of chain, $2 = policy
{
run_iptables -P $1 $2
}
#
# Set a standard chain to enable established and related connections
#
setcontinue() # $1 = name of chain
{
run_iptables -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT
}
#
# Flush one of the Mangle table chains
#
flushmangle() # $1 = name of chain
{
run_iptables -t mangle -F $1
}
#
# Flush and delete all user-defined chains in the filter table
#
deleteallchains() {
run_iptables -F
run_iptables -X
}
#
# 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 ! 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
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
[ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ]
[ -z "$MODULESDIR" ] && MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv6/netfilter:/lib/modules/$(uname -r)/kernel/net/netfilter
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 Shorewall6
#
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=${1:-Yes} # So old compiled scripts still work
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
[ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ]
[ -z "$MODULESDIR" ] && \
MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv6/netfilter:/lib/modules/$(uname -r)/kernel/net/netfilter
for directory in $(split $MODULESDIR); do
[ -d $directory ] && moduledirectories="$moduledirectories $directory"
done
modules=$(find_file modules)
if [ -f $modules -a -n "$moduledirectories" ]; then
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
}
#
# Query NetFilter about the existence of a filter chain
#
chain_exists() # $1 = chain name
{
qt1 $IP6TABLES -L $1 -n
}
#
# Find the value 'dev' in the passed arguments then echo the next value
#
find_device() {
while [ $# -gt 1 ]; do
[ "x$1" = xdev ] && echo $2 && return
shift
done
}
#
# Find the value 'via' in the passed arguments then echo the next value
#
find_gateway() {
while [ $# -gt 1 ]; do
[ "x$1" = xvia ] && echo $2 && return
shift
done
}
#
# Find the value 'mtu' in the passed arguments then echo the next value
#
find_mtu() {
while [ $# -gt 1 ]; do
[ "x$1" = xmtu ] && echo $2 && return
shift
done
}
#
# Find the value 'peer' in the passed arguments then echo the next value up to
# "/"
#
find_peer() {
while [ $# -gt 1 ]; do
[ "x$1" = xpeer ] && echo ${2%/*} && return
shift
done
}
#
# Try to find the gateway through an interface looking for 'nexthop'
find_nexthop() # $1 = interface
{
echo $(find_gateway `$IP -6 route list | grep "[[:space:]]nexthop.* $1"`)
}
#
# Find the default route's interface
#
find_default_interface() {
$IP -6 route list | while read first rest; do
[ "$first" = default ] && echo $(find_device $rest) && return
done
}
#
# 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 ${dev%:}
return
fi
esac
done
}
#
# Determine if Interface is up
#
interface_is_up() {
[ -n "$($IP link list dev $1 2> /dev/null | grep -e '[<,]UP[,>]')" ]
}
#
# Find interface address--returns the first IP address assigned to the passed
# device
#
find_first_interface_address() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$($IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 .* global' | head -n1)
#
# If there wasn't one, bail out now
#
[ -n "$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.*//'
}
find_first_interface_address_if_any() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$($IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 2.* global' | head -n1)
#
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
# along with everything else on the line
#
[ -n "$addr" ] && echo $addr | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//' || echo ::
}
#
# Determine if interface is usable from a Netfilter prespective
#
interface_is_usable() # $1 = interface
{
interface_is_up $1 && [ "$(find_first_interface_address_if_any $1)" != :: ] && run_isusable_exit $1
}
#
# Find interface addresses--returns the set of addresses assigned to the passed
# device
#
find_interface_addresses() # $1 = interface
{
$IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 2' | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//'
}
#
# Get all interface addresses with VLSMs
#
find_interface_full_addresses() # $1 = interface
{
$IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 ' | sed 's/\s*inet6 //;s/ scope.*//;s/ peer.*//'
}
#
# echo the list of networks routed out of a given interface
#
get_routed_networks() # $1 = interface name, $2-n = Fatal error message
{
local address
local rest
$IP -6 route show dev $1 2> /dev/null |
while read address rest; do
case "$address" in
default)
if [ $# -gt 1 ]; then
shift
fatal_error "$@"
else
echo "WARNING: default route ignored on interface $1" >&2
fi
;;
multicast|broadcast|prohibit|nat|throw|nexthop)
;;
2*)
[ "$address" = "${address%/*}" ] && address="${address}/128"
echo $address
;;
esac
done
}
#
# Normalize an IPv6 Address by compressing out consecutive zero elements
#
normalize_address() # $1 = valid IPv6 Address
{
local address
address=$1
local j
while true; do
case $address in
::*)
address=0$address
;;
*::*)
list_count $(split $address)
j=$?
if [ $j -eq 7 ]; then
address=${address%::*}:0:${address#*::}
elif [ $j -eq 8 ]; then
$address=${address%::*}:${address#*::}
break 2
else
address=${address%::*}:0::${address#*::}
fi
;;
*)
echo $address
break 2
;;
esac
done
}
#
# Reads correctly-formed and fully-qualified host and subnet addresses from STDIN. For each
# that defines a /120 or larger network, it sends to STDOUT:
#
# The corresponding subnet-router anycast address (all host address bits are zero)
# The corresponding anycast addresses defined by RFC 2526 (the last 128 addresses in the subnet)
#
convert_to_anycast() {
local address
local badress
local vlsm
local host
local o
local m
m=
local z
z=65535
local l
while read address; do
case $address in
2*|3*)
vlsm=${address#*/}
vlsm=${vlsm:=128}
if [ $vlsm -le 120 ]; then
#
# Defines a viable subnet -- first get the subnet-router anycast address
#
host=$((128 - $vlsm))
address=$(normalize_address ${address%/*})
while [ $host -ge 16 ]; do
address=${address%:*}
host=$(($host - 16))
done
if [ $host -gt 0 ]; then
#
# VLSM is not a multiple of 16
#
host=$((16 - $host))
o=$((0x${address##*:}))
m=0
while [ $host -gt 0 ]; do
m=$((($m >> 1) | 0x8000))
z=$(($z >> 1))
host=$(($host - 1))
done
o=$(($o & $m))
badress=${address%:*}
address=$badress:$(printf %04x $o)
z=$(($o | $z))
if [ $vlsm -gt 112 ]; then
z=$(($z & 0xff80))
fi
badress=$badress:$(printf %04x $z)
else
badress=$address
fi
#
# Note: at this point $address and $badress are the same except possibly for
# the contents of the last half-word
#
list_count $(split $address)
l=$?
#
# Now generate the anycast addresses defined by RFC 2526
#
if [ $l -lt 8 ]; then
#
# The subnet-router address
#
echo $address::
while [ $l -lt 8 ]; do
badress=$badress:ffff
l=$(($l + 1 ))
done
else
#
# The subnet-router address
#
echo $address
fi
#
# And the RFC 2526 addresses
#
echo $badress/121
fi
;;
esac
done
}
#
# Generate a list of anycast addresses for a given interface
#
get_interface_acasts() # $1 = interface
{
local addresses
addresses=
find_interface_full_addresses $1 | convert_to_anycast | sort -u
}
#
# Get a list of all configured anycast addresses on the system
#
get_all_acasts()
{
find_interface_full_addresses | convert_to_anycast | sort -u
}
#
# 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
{
echo "$1 ($(date))" > ${VARDIR}/state
}
#
# 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 $@))
}
#
# Detect the gateway through an interface
#
detect_gateway() # $1 = interface
{
local interface
interface=$1
#
# First assume that this is some sort of point-to-point interface
#
gateway=$( find_peer $($IP -6 addr list $interface ) )
#
# Maybe there's a default route through this gateway already
#
[ -n "$gateway" ] || gateway=$(find_gateway $($IP -6 route list dev $interface | grep '^default'))
#
# Last hope -- is there a load-balancing route through the interface?
#
[ -n "$gateway" ] || gateway=$(find_nexthop $interface)
#
# Be sure we found one
#
[ -n "$gateway" ] && echo $gateway
}
# 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}
}
#
# Clear the current traffic shaping configuration
#
delete_tc1()
{
clear_one_tc() {
$TC qdisc del dev $1 root 2> /dev/null
$TC qdisc del dev $1 ingress 2> /dev/null
}
run_tcclear_exit
run_ip link list | \
while read inx interface details; do
case $inx in
[0-9]*)
clear_one_tc ${interface%:}
;;
*)
;;
esac
done
}
#
# Detect a device's MTU -- echos the passed device's MTU
#
get_device_mtu() # $1 = device
{
local output
output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
if [ -n "$output" ]; then
echo $(find_mtu $output)
else
echo 1500
fi
}
#
# Version of the above that doesn't generate any output for MTU 1500.
# Generates 'mtu <mtu+>' otherwise, where <mtu+> is the device's MTU + 100
#
get_device_mtu1() # $1 = device
{
local output
output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
local mtu
if [ -n "$output" ]; then
mtu=$(find_mtu $output)
if [ -n "$mtu" ]; then
[ $mtu = 1500 ] || echo mtu $(($mtu + 100))
fi
fi
}
#
# Undo changes to routing
#
undo_routing() {
if [ -z "$NOROUTES" ]; then
#
# Restore rt_tables database
#
if [ -f ${VARDIR}/rt_tables ]; then
[ -w /etc/iproute2/rt_table -a -z "$KEEP_RT_TABLES" ] && cp -f ${VARDIR}/rt_tables /etc/iproute2/ && progress_message "/etc/iproute2/rt_tables database restored"
rm -f ${VARDIR}/rt_tables
fi
#
# Restore the rest of the routing table
#
if [ -f ${VARDIR}/undo_routing ]; then
. ${VARDIR}/undo_routing
progress_message "Shorewall-generated routing tables and routing rules removed"
rm -f ${VARDIR}/undo_routing
fi
fi
}
#
# Restore the default route that was in place before the initial 'shorewall start'
#
restore_default_route() {
if [ -z "$NOROUTES" -a -f ${VARDIR}/default_route ]; then
local default_route
default_route=
local route
local result
result=1
while read route ; do
case $route in
default)
if [ -n "$default_route" ]; then
case "$default_route" in
*metric*)
#
# Don't restore a route with a metric -- we only replace the one with metric == 0
#
qt $IP -6 route delete default metric 0 && \
progress_message "Default Route with metric 0 deleted"
;;
*)
qt $IP -6 route replace $default_route && \
result=0 && \
progress_message "Default Route (${default_route# }) restored"
;;
esac
break
fi
default_route="$default_route $route"
;;
*)
default_route="$default_route $route"
;;
esac
done < ${VARDIR}/default_route
rm -f ${VARDIR}/default_route
fi
return $result
}
#
# Determine how to do "echo -e"
#
find_echo() {
local result
result=$(echo "a\tb")
[ ${#result} -eq 3 ] && { echo echo; return; }
result=$(echo -e "a\tb")
[ ${#result} -eq 3 ] && { echo "echo -e"; return; }
result=$(which echo)
[ -n "$result" ] && { echo "$result -e"; return; }
echo echo
}
#
# Flush the conntrack table if $PURGE is non-empty
#
conditionally_flush_conntrack() {
if [ -n "$PURGE" ]; then
if [ -n $(which conntrack) ]; then
conntrack -F
else
error_message "WARNING: The '-p' option requires the conntrack utility which does not appear to be installed on this system"
fi
fi
}
################################################################################
# End of functions imported from /usr/share/shorewall/prog.header6
################################################################################