/usr/share/shorewall/lib.common is in shorewall-core 5.1.12.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Shorewall 5.1 -- /usr/share/shorewall/lib.common.
#
# (c) 2010-2017 - Tom Eastep (teastep@shorewall.net)
#
# Complete documentation is available at http://shorewall.net
#
# This program is part of Shorewall.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 2 of the license or, at your
# option, any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
#
# The purpose of this library is to hold those functions used by both the CLI and by the
# generated firewall scripts. To avoid versioning issues, it is copied into generated
# scripts rather than loaded at run-time.
#
#########################################################################################
#
# Wrapper around logger that sets the tag according to $SW_LOGGERTAG
#
mylogger() {
local level
level=$1
shift
if [ -n "$SW_LOGGERTAG" ]; then
logger -p $level -t "$SW_LOGGERTAG" $*
else
logger -p $level $*
fi
}
#
# Issue a message and stop
#
startup_error() # $* = Error Message
{
echo " ERROR: $@: Firewall state not changed" >&2
if [ $LOG_VERBOSITY -ge 0 ]; then
timestamp="$(date +'%b %e %T') "
echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
fi
case $COMMAND in
start)
mylogger kern.err "ERROR:$g_product start failed:Firewall state not changed"
;;
restart)
mylogger kern.err "ERROR:$g_product restart failed:Firewall state not changed"
;;
restore)
mylogger kern.err "ERROR:$g_product restore failed:Firewall state not changed"
;;
esac
if [ $LOG_VERBOSITY -ge 0 ]; then
timestamp="$(date +'%b %e %T') "
case $COMMAND in
start)
echo "${timestamp} ERROR:$g_product start failed:Firewall state not changed" >> $STARTUP_LOG
;;
restart)
echo "${timestamp} ERROR:$g_product restart failed:Firewall state not changed" >> $STARTUP_LOG
;;
restore)
echo "${timestamp} ERROR:$g_product restore failed:Firewall state not changed" >> $STARTUP_LOG
;;
esac
fi
mutex_off
kill $$
exit 2
}
#
# Create the required option string and run the passed script using
# $SHOREWALL_SHELL
#
run_it() {
local script
local options
export VARDIR
script=$1
shift
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
[ -n "$g_counters" ] && options=${options}c
options="${options}V $VERBOSITY"
[ -n "$RESTOREFILE" ] && options="${options} -R $RESTOREFILE"
$SHOREWALL_SHELL $script $options $@
}
#
# Message to stderr
#
error_message() # $* = Error Message
{
echo " $@" >&2
return 1
}
#
# 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
}
#
# Split a comma-separated list into a space-separated list
#
split_list() {
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() {
local pwd
pwd=$PWD
cd $(dirname $0)
echo $PWD/$(basename $0)
cd $pwd
}
#
# 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
shift
local moduleoptions
moduleoptions=$*
local modulefile
local suffix
if [ -d /sys/module/ ]; then
if ! list_search $modulename $DONT_LOAD; then
if [ ! -d /sys/module/$modulename ]; then
case $moduleloader in
insmod)
for directory in $moduledirectories; do
for modulefile in $directory/${modulename}.*; do
if [ -f $modulefile ]; then
insmod $modulefile $moduleoptions
return
fi
done
done
;;
*)
modprobe -q $modulename $moduleoptions
;;
esac
fi
fi
elif ! list_search $modulename $DONT_LOAD $MODULES; then
case $moduleloader in
insmod)
for directory in $moduledirectories; do
for modulefile in $directory/${modulename}.*; do
if [ -f $modulefile ]; then
insmod $modulefile $moduleoptions
return
fi
done
done
;;
*)
modprobe -q $modulename $moduleoptions
;;
esac
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
local extras
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
if [ -n "$MODULESDIR" ]; then
case "$MODULESDIR" in
+*)
extras="$MODULESDIR"
extras=${extras#+}
MODULESDIR=
;;
esac
fi
if [ -z "$MODULESDIR" ]; then
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
if [ -n "$extras" ]; then
for directory in $(split "$extras"); do
MODULESDIR="$MODULESDIR:/lib/modules/$uname/$directory"
done
fi
fi
[ -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
local extras
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
if [ -n "$MODULESDIR" ]; then
case "$MODULESDIR" in
+*)
extras="$MODULESDIR"
extras=${extras#+}
MODULESDIR=
;;
esac
fi
if [ -z "$MODULESDIR" ]; then
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
if [ -n "$extras" ]; then
for directory in $(split "$extras"); do
MODULESDIR="$MODULESDIR:/lib/modules/$uname/$directory"
done
fi
fi
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, $2 = table name (optional)
{
qt1 $g_tool -t ${2:-filter} -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} -f inet 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 | grep -F 'inet6 ' | grep -vF '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 | grep -F 'inet6 ' | grep -vF '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
}
#
#Determines if the passed interface is a loopback interface
#
loopback_interface() { #$1 = Interface name
[ "$1" = lo ] || $IP link show $1 | fgrep -q LOOPBACK
}
#
# Find Loopback Interfaces
#
find_loopback_interfaces() {
local interfaces
[ -x "$IP" ] && interfaces=$($IP link show | fgrep LOOPBACK | sed 's/://g' | cut -d ' ' -f 2)
[ -n "$interfaces" ] && echo $interfaces || echo lo
}
#
# 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
if [ -n "$g_shorewalldir" ]; then
echo ${g_shorewalldir}/$1
else
echo ${g_confdir}/$1
fi
;;
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}
}
#
# Call this function to assert mutual exclusion with Shorewall. If you invoke the
# /sbin/shorewall program while holding mutual exclusion, you should pass "nolock" as
# the first argument. Example "shorewall nolock refresh"
#
# This function uses the lockfile utility from procmail if it exists.
# Otherwise, it uses a somewhat race-prone algorithm to attempt to simulate the
# behavior of lockfile.
#
mutex_on()
{
local try
try=0
local lockf
lockf=${LOCKFILE:=${VARDIR}/lock}
local lockpid
local lockd
MUTEX_TIMEOUT=${MUTEX_TIMEOUT:-60}
if [ $MUTEX_TIMEOUT -gt 0 ]; then
lockd=$(dirname $LOCKFILE)
[ -d "$lockd" ] || mkdir -p "$lockd"
if [ -f $lockf ]; then
lockpid=`cat ${lockf} 2> /dev/null`
if [ -z "$lockpid" -o $lockpid = 0 ]; then
rm -f ${lockf}
error_message "WARNING: Stale lockfile ${lockf} removed"
elif [ $lockpid -eq $$ ]; then
return 0
elif ! ps | grep -v grep | qt grep ${lockpid}; then
rm -f ${lockf}
error_message "WARNING: Stale lockfile ${lockf} from pid ${lockpid} removed"
fi
fi
if qt mywhich lockfile; then
lockfile -${MUTEX_TIMEOUT} -r1 ${lockf}
chmod u+w ${lockf}
echo $$ > ${lockf}
chmod u-w ${lockf}
elif qt mywhich lock; then
lock ${lockf}
chmod u=r ${lockf}
else
while [ -f ${lockf} -a ${try} -lt ${MUTEX_TIMEOUT} ] ; do
sleep 1
try=$((${try} + 1))
done
if [ ${try} -lt ${MUTEX_TIMEOUT} ] ; then
# Create the lockfile
echo $$ > ${lockf}
else
echo "Giving up on lock file ${lockf}" >&2
fi
fi
fi
}
#
# Call this function to release mutual exclusion
#
mutex_off()
{
[ -f ${CONFDIR}/rc.common ] && lock -u ${LOCKFILE:=${VARDIR}/lock}
rm -f ${LOCKFILE:=${VARDIR}/lock}
}
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