RedHat Iptables 脚本移植给SUSE

RedHat Iptables 脚本移植给SUSE

很多RedHat用户习惯使用RedHat的iptables启动脚本，此文附SUSE的iptables启动脚本

配置文件与RedHat完全一样 

#!/bin/sh
# Copyright (c) 2007 SuSE Linux AG Nuernberg, Germany.
#
# Author: devil <guxing1841@gmail.com>
#
# /etc/init.d/iptables
#

### BEGIN INIT INFO
# Provides:       iptables
# Required-Start: $local_fs dbus haldaemon
# Required-Stop:
# Default-Start:  3 5
# Default-Stop:
# Description:    start iptables fireware
### END INIT INFO

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

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num><num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
. /etc/rc.status

# First reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - insufficient privilege
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running
#
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.

if [ ! -x /usr/sbin/$IPTABLES ]; then
    echo -n $"/sbin/$IPTABLES does not exist.";
    rc_failed; rc_status -v;
    rc_exit;
fi

if lsmod 2>/dev/null | grep -q ipchains ; then
    echo -n $"ipchains and $IPTABLES can not be used together.";
    rc_failed; rc_status -v;
    rc_exit;
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"

# 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 $PROC_IPTABLES_NAMES 2>/dev/null`
    if [ -z "$tables" ]; then
        return 1;
    fi

    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
    rc_failed $ret
    rc_status -v
    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
        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
    rc_failed $ret
    rc_status -v
    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"
    ret=0
    $IPTABLES-restore $OPT $IPTABLES_DATA
    ret=$?
    if [ $ret -ne 0 ]; then
    return $ret
    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
    fi
  
    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 ${IPV}_conntrack
    let ret+=$?;
    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
    return $ret
}

status() {
    # 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" ]; 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
    tables=`cat $PROC_IPTABLES_NAMES 2>/dev/null`
    if [ -z "$tables" ]; then
    echo $"Firewall is not configured. "
    return 1
    fi

    NUM=
    [ "x$IPTABLES_STATUS_NUMERIC" = "xyes" ] && NUM="-n"

    for table in $tables; do
    echo $"Table: $table"
    $IPTABLES -t $table --list $NUM && echo
    done

    return 0
}

restart() {
    if [ "x$IPTABLES_SAVE_ON_RESTART" = "xyes" ]; then
    save;
    rc_status -v
    fi
    stop
    rc_status -v
    start
}

case "$1" in
    start)
    stop
    rc_status -v
    start
    rc_status -v
    ;;
    stop)
    if [ "x$IPTABLES_SAVE_ON_STOP" = "xyes" ]; then
       save;
       rc_status -v
    fi
    stop
    rc_status -v
    ;;
    restart)
    restart
    rc_status -v
    ;;
    condrestart)
    [ -e "$VAR_SUBSYS_IPTABLES" ] && restart
    rc_status -v
    ;;
    status)
    status
    rc_status -v
    ;;
    panic)
    flush_n_delete
    set_policy DROP
    rc_status -v
    ;;
    save)
    save
    rc_status -v
    ;;
    *)
    echo $"Usage: $0 {start|stop|restart|condrestart|status|panic|save}"
    exit 1
    ;;
esac

rc_exit;