#!/bin/sh
#
# iptables Start iptables firewall
#
# chkconfig: 2345 08 92
# description: Starts, stops and saves iptables firewall
#
# config: /etc/sysconfig/iptables
# config: /etc/sysconfig/iptables-config
# Source function library.
. /etc/init.d/functions
IPTABLES=iptables
IPTABLES_DATA=/etc/sysconfig/$IPTABLES
IPTABLES_CONFIG=/etc/sysconfig/${IPTABLES}-config
IPV=${IPTABLES%tables} # ip for ipv4 | ip6 for ipv6
PROC_IPTABLES_NAMES=/proc/net/${IPV}_tables_names
VAR_SUBSYS_IPTABLES=/var/lock/subsys/$IPTABLES
if [ ! -x /sbin/$IPTABLES ]; then
echo -n $"/sbin/$IPTABLES does not exist."; warning; echo
exit 0
fi
if lsmod 2>/dev/null | grep -q ipchains ; then
echo -n $"ipchains and $IPTABLES can not be used together."; warning; echo
exit 1
fi
# Old or new modutils
/sbin/modprobe --version 2>&1 | grep -q module-init-tools \
&& NEW_MODUTILS=1 \
|| NEW_MODUTILS=0
# Default firewall configuration:
IPTABLES_MODULES=""
IPTABLES_MODULES_UNLOAD="yes"
IPTABLES_SAVE_ON_STOP="no"
IPTABLES_SAVE_ON_RESTART="no"
IPTABLES_SAVE_COUNTER="no"
IPTABLES_STATUS_NUMERIC="yes"
IPTABLES_SYSCTL_LOAD_LIST=""
# Load firewall configuration.
[ -f "$IPTABLES_CONFIG" ] && . "$IPTABLES_CONFIG"
rmmod_r() {
# Unload module with all referring modules.
# At first all referring modules will be unloaded, then the module itself.
local mod=$1
local ret=0
local ref=
# Get referring modules.
# New modutils have another output format.
[ $NEW_MODUTILS = 1 ] \
&& ref=`lsmod | awk "/^${mod}/ { print \\\$4; }" | tr ',' ' '` \
|| ref=`lsmod | grep ^${mod} | cut -d "[" -s -f 2 | cut -d "]" -s -f 1`
# recursive call for all referring modules
for i in $ref; do
rmmod_r $i
let ret+=$?;
done
# Unload module.
# The extra test is for 2.6: The module might have autocleaned,
# after all referring modules are unloaded.
if grep -q "^${mod}" /proc/modules ; then
modprobe -r $mod > /dev/null 2>&1
let ret+=$?;
fi
return $ret
}
flush_n_delete() {
# Flush firewall rules and delete chains.
[ -e "$PROC_IPTABLES_NAMES" ] || return 1
# Check if firewall is configured (has tables)
tables=`cat $PROC_IPTABLES_NAMES 2>/dev/null`
[ -z "$tables" ] && return 1
echo -n $"Flushing firewall rules: "
ret=0
# For all tables
for i in $tables; do
# Flush firewall rules.
$IPTABLES -t $i -F;
let ret+=$?;
# Delete firewall chains.
$IPTABLES -t $i -X;
let ret+=$?;
# Set counter to zero.
$IPTABLES -t $i -Z;
let ret+=$?;
done
[ $ret -eq 0 ] && success || failure
echo
return $ret
}
set_policy() {
# Set policy for configured tables.
policy=$1
# Check if iptable module is loaded
[ ! -e "$PROC_IPTABLES_NAMES" ] && return 1
# Check if firewall is configured (has tables)
tables=`cat $PROC_IPTABLES_NAMES 2>/dev/null`
[ -z "$tables" ] && return 1
echo -n $"Setting chains to policy $policy: "
ret=0
for i in $tables; do
echo -n "$i "
case "$i" in
raw)
$IPTABLES -t raw -P PREROUTING $policy \
&& $IPTABLES -t raw -P OUTPUT $policy \
|| let ret+=1
;;
filter)
$IPTABLES -t filter -P INPUT $policy \
&& $IPTABLES -t filter -P OUTPUT $policy \
&& $IPTABLES -t filter -P FORWARD $policy \
|| let ret+=1
;;
nat)
$IPTABLES -t nat -P PREROUTING $policy \
&& $IPTABLES -t nat -P POSTROUTING $policy \
&& $IPTABLES -t nat -P OUTPUT $policy \
|| let ret+=1
;;
mangle)
$IPTABLES -t mangle -P PREROUTING $policy \
&& $IPTABLES -t mangle -P POSTROUTING $policy \
&& $IPTABLES -t mangle -P INPUT $policy \
&& $IPTABLES -t mangle -P OUTPUT $policy \
&& $IPTABLES -t mangle -P FORWARD $policy \
|| let ret+=1
;;
*)
let ret+=1
;;
esac
done
[ $ret -eq 0 ] && success || failure
echo
return $ret
}
load_sysctl() {
# load matched sysctl values
if [ -n "$IPTABLES_SYSCTL_LOAD_LIST" ]; then
echo -n $"Loading sysctl settings: "
ret=0
for item in $IPTABLES_SYSCTL_LOAD_LIST; do
fgrep $item /etc/sysctl.conf | sysctl -p - >/dev/null
let ret+=$?;
done
[ $ret -eq 0 ] && success || failure
echo
fi
return $ret
}
start() {
# Do not start if there is no config file.
[ -f "$IPTABLES_DATA" ] || return 1
echo -n $"Applying $IPTABLES firewall rules: "
OPT=
[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c"
$IPTABLES-restore $OPT $IPTABLES_DATA
if [ $? -eq 0 ]; then
success; echo
else
failure; echo; return 1
fi
# Load additional modules (helpers)
if [ -n "$IPTABLES_MODULES" ]; then
echo -n $"Loading additional $IPTABLES modules: "
ret=0
for mod in $IPTABLES_MODULES; do
echo -n "$mod "
modprobe $mod > /dev/null 2>&1
let ret+=$?;
done
[ $ret -eq 0 ] && success || failure
echo
fi
# Load sysctl settings
load_sysctl
touch $VAR_SUBSYS_IPTABLES
return $ret
}
stop() {
# Do not stop if iptables module is not loaded.
[ -e "$PROC_IPTABLES_NAMES" ] || return 1
flush_n_delete
set_policy ACCEPT
if [ "x$IPTABLES_MODULES_UNLOAD" = "xyes" ]; then
echo -n $"Unloading $IPTABLES modules: "
ret=0
rmmod_r ${IPV}_tables
let ret+=$?;
rmmod_r ${IPV}_conntrack
let ret+=$?;
[ $ret -eq 0 ] && success || failure
echo
fi
rm -f $VAR_SUBSYS_IPTABLES
return $ret
}
save() {
# Check if iptable module is loaded
[ ! -e "$PROC_IPTABLES_NAMES" ] && return 1
# Check if firewall is configured (has tables)
tables=`cat $PROC_IPTABLES_NAMES 2>/dev/null`
[ -z "$tables" ] && return 1
echo -n $"Saving firewall rules to $IPTABLES_DATA: "
OPT=
[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c"
ret=0
TMP_FILE=`/bin/mktemp -q /tmp/$IPTABLES.XXXXXX` \
&& chmod 600 "$TMP_FILE" \
&& $IPTABLES-save $OPT > $TMP_FILE 2>/dev/null \
&& size=`stat -c '%s' $TMP_FILE` && [ $size -gt 0 ] \
|| ret=1
if [ $ret -eq 0 ]; then
if [ -e $IPTABLES_DATA ]; then
cp -f $IPTABLES_DATA $IPTABLES_DATA.save \
&& chmod 600 $IPTABLES_DATA.save \
|| ret=1
fi
if [ $ret -eq 0 ]; then
cp -f $TMP_FILE $IPTABLES_DATA \
&& chmod 600 $IPTABLES_DATA \
|| ret=1
fi
fi
[ $ret -eq 0 ] && success || failure
echo
rm -f $TMP_FILE
return $ret
}
status() {
tables=`cat $PROC_IPTABLES_NAMES 2>/dev/null`
# Do not print status if lockfile is missing and iptables modules are not
# loaded.
# Check if iptable module is loaded
if [ ! -f "$VAR_SUBSYS_IPTABLES" -a -z "$tables" ]; then
echo $"Firewall is stopped."
return 1
fi
# Check if firewall is configured (has tables)
if [ ! -e "$PROC_IPTABLES_NAMES" ]; then
echo $"Firewall is not configured. "
return 1
fi
if [ -z "$tables" ]; then
echo $"Firewall is not configured. "
return 1
fi
NUM=
[ "x$IPTABLES_STATUS_NUMERIC" = "xyes" ] && NUM="-n"
VERBOSE=
[ "x$IPTABLES_STATUS_VERBOSE" = "xyes" ] && VERBOSE="--verbose"
COUNT=
[ "x$IPTABLES_STATUS_LINENUMBERS" = "xyes" ] && COUNT="--line-numbers"
for table in $tables; do
echo $"Table: $table"
$IPTABLES -t $table --list $NUM $VERBOSE $COUNT && echo
done
return 0
}
reload() {
IPTABLES_MODULES_UNLOAD="no"
restart
}
restart() {
[ "x$IPTABLES_SAVE_ON_RESTART" = "xyes" ] && save
stop
start
}
case "$1" in
start)
stop
start
RETVAL=$?
;;
stop)
[ "x$IPTABLES_SAVE_ON_STOP" = "xyes" ] && save
stop
RETVAL=$?
;;
reload)
[ -e "$VAR_SUBSYS_IPTABLES" ] && reload
;;
restart)
restart
RETVAL=$?
;;
condrestart)
[ -e "$VAR_SUBSYS_IPTABLES" ] && restart
;;
status)
status
RETVAL=$?
;;
panic)
flush_n_delete
set_policy DROP
RETVAL=$?
;;
save)
save
RETVAL=$?
;;
*)
echo $"Usage: $0 {start|stop|reload|restart|condrestart|status|panic|save}"
exit 1
;;
esac
exit $RETVAL
