#!/bin/bash
#
# Startup script to implement /etc/firehol/firehol.conf pre-defined rules.
#
# chkconfig: 2345 99 92
#
# description: creates stateful iptables packet filtering firewalls.
#
# by Costa Tsaousis <costa@tsaousis.gr>
#
# config: /etc/firehol/firehol.conf
#
# $Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
#

# Make sure only root can run us.
if [ ! "${UID}" = 0 ]
then
	echo >&2
	echo >&2
	echo >&2 "Only user root can run FireHOL."
	echo >&2
fi

# Remember who you are.
FIREHOL_FILE="${0}"
FIREHOL_DEFAULT_WORKING_DIRECTORY="${PWD}"

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# EXTERNAL/SYSTEM COMMANDS MANAGEMENT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

export PATH="${PATH}:/bin:/usr/bin:/sbin:/usr/sbin"

# External commands FireHOL will need.
# If one of those is not found, FireHOL will refuse to run.

which_cmd() {
	local block=1
	if [ "a${1}" = "a-n" ]
	then
		local block=0
		shift
	fi
	
	unalias $2 >/dev/null 2>&1
	local cmd=`which $2 2>/dev/null | head -n 1`
	if [ $? -gt 0 -o ! -x "${cmd}" ]
	then
		if [ ${block} -eq 1 ]
		then
			echo >&2
			echo >&2 "ERROR:	Command '$2' not found in the system path."
			echo >&2 "	FireHOL requires this command for its operation."
			echo >&2 "	Please install the required package and retry."
			echo >&2
			echo >&2 "	Note that you need an operational 'which' command"
			echo >&2 "	for FireHOL to find all the external programs it"
			echo >&2 "	needs. Check it yourself. Run:"
			echo >&2
			echo >&2 "	which $2"
			exit 1
		fi
		return 1
	fi
	
	eval $1=${cmd}
	return 0
}

# Check for a command during runtime.
# Currently the following commands are required only when needed:
#
# wget or curl (either is fine)
# gzcat
#
require_cmd() {
	for x in $1
	do
		eval var=`echo ${x} | tr 'a-z' 'A-Z'`_CMD
		eval val=\$\{${var}\}
		if [ -z "${val}" ]
		then
			which_cmd -n "${var}" "${x}"
			test $? -eq 0 && return 0
		fi
	done
	
	return 1
}

which_cmd CAT_CMD cat
which_cmd CUT_CMD cut
which_cmd CHOWN_CMD chown
which_cmd CHMOD_CMD chmod
which_cmd DATE_CMD date
which_cmd EGREP_CMD egrep
which_cmd EXPR_CMD expr
which_cmd GAWK_CMD gawk
which_cmd GREP_CMD grep
which_cmd HEAD_CMD head
which_cmd HOSTNAME_CMD hostname
which_cmd IP_CMD ip
which_cmd IPTABLES_CMD iptables
which_cmd IPTABLES_SAVE_CMD iptables-save
which_cmd LESS_CMD less
which_cmd LSMOD_CMD lsmod
which_cmd MKDIR_CMD mkdir
which_cmd MV_CMD mv
which_cmd MODPROBE_CMD modprobe
which_cmd NETSTAT_CMD netstat
which_cmd RENICE_CMD renice
which_cmd RM_CMD rm
which_cmd SED_CMD sed
which_cmd SORT_CMD sort
which_cmd SYSCTL_CMD sysctl
which_cmd TOUCH_CMD touch
which_cmd TR_CMD tr
which_cmd UNAME_CMD uname
which_cmd UNIQ_CMD uniq

# Make sure our generated files cannot be accessed by anyone else.
umask 077

# Be nice on production environments
${RENICE_CMD} 10 $$ >/dev/null 2>/dev/null

# Find our minor version
firehol_minor_version() {
${CAT_CMD} <<"EOF" | ${CUT_CMD} -d ' ' -f 3 | ${CUT_CMD} -d '.' -f 2
$Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
EOF
}

FIREHOL_MINOR_VERSION=`firehol_minor_version`
${EXPR_CMD} ${FIREHOL_MINOR_VERSION} + 0 >/dev/null 2>&1
if [ $? -ne 0 ]
then
	FIREHOL_MINOR_VERSION=220
fi


# Initialize iptables
${IPTABLES_CMD} -nxvL >/dev/null 2>&1


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# GLOBAL DEFAULTS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ----------------------------------------------------------------------
# Directories and files

# These files will be created and deleted during our run.
FIREHOL_DIR="/tmp/.firehol-tmp-$$-${RANDOM}-${RANDOM}"
FIREHOL_CHAINS_DIR="${FIREHOL_DIR}/chains"
FIREHOL_OUTPUT="${FIREHOL_DIR}/firehol-out.sh"
FIREHOL_SAVED="${FIREHOL_DIR}/firehol-save.sh"
FIREHOL_TMP="${FIREHOL_DIR}/firehol-tmp.sh"

FIREHOL_SPOOL_DIR="/var/spool/firehol"

# The default configuration file
# It can be changed on the command line
FIREHOL_CONFIG_DIR="/etc/firehol"
FIREHOL_CONFIG="${FIREHOL_CONFIG_DIR}/firehol.conf"

# Where /etc/init.d/iptables expects its configuration?
# Leave it empty for automatic detection
FIREHOL_AUTOSAVE=


# ------------------------------------------------------------------------------
# Make sure we automatically cleanup when we exit.
# WHY:
# Even a CTRL-C will call this and we will not leave temp files.
# Also, if a configuration file breaks, we will detect this too.

firehol_exit() {
	if [ -f "${FIREHOL_SAVED}" ]
	then
		echo
		echo -n $"FireHOL: Restoring old firewall:"
		iptables-restore <"${FIREHOL_SAVED}"
		if [ $? -eq 0 ]
		then
			success $"FireHOL: Restoring old firewall:"
		else
			failure $"FireHOL: Restoring old firewall:"
		fi
		echo
	fi
	
	test -d "${FIREHOL_DIR}" && ${RM_CMD} -rf "${FIREHOL_DIR}"
	return 0
}

# Run our exit even if we don't call exit.
trap firehol_exit EXIT


# ------------------------------------------------------------------------------
# Create the directories we need.

if [ ! -d "${FIREHOL_CONFIG_DIR}" -a -f /etc/firehol.conf ]
then
	"${MKDIR_CMD}" "${FIREHOL_CONFIG_DIR}"			|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_CONFIG_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_CONFIG_DIR}"		|| exit 1
	"${MV_CMD}" /etc/firehol.conf "${FIREHOL_CONFIG}"	|| exit 1
	
	echo >&2
	echo >&2
	echo >&2 "NOTICE: Your config file /etc/firehol.conf has been moved to ${FIREHOL_CONFIG}"
	echo >&2
	sleep 5
fi

# Externally defined services can be placed in "${FIREHOL_CONFIG_DIR}/services/"
if [ ! -d "${FIREHOL_CONFIG_DIR}/services" ]
then
	"${MKDIR_CMD}" "${FIREHOL_CONFIG_DIR}/services"
	if [ $? -ne 0 ]
	then
		echo >&2
		echo >&2
		echo >&2 "FireHOL needs to create the directory '${FIREHOL_CONFIG_DIR}/services', but it cannot."
		echo >&2 "Possibly you have a file with this name, or something else is happening."
		echo >&2 "Please solve this issue and retry".
		echo >&2
		exit 1
	fi
	"${CHOWN_CMD}" root:root "${FIREHOL_CONFIG_DIR}/services"
	"${CHMOD_CMD}" 700 "${FIREHOL_CONFIG_DIR}/services"
fi

# Remove any old directories that might be there.
if [ -d "${FIREHOL_DIR}" ]
then
	"${RM_CMD}" -rf "${FIREHOL_DIR}"
	if [ $? -ne 0 -o -e "${FIREHOL_DIR}" ]
	then
		echo >&2
		echo >&2
		echo >&2 "Cannot clean temporary directory '${FIREHOL_DIR}'."
		echo >&2
		exit 1
	fi
fi
"${MKDIR_CMD}" "${FIREHOL_DIR}"				|| exit 1
"${MKDIR_CMD}" "${FIREHOL_CHAINS_DIR}"			|| exit 1


# Make sure we have a directory for our data.
if [ ! -d "${FIREHOL_SPOOL_DIR}" ]
then
	"${MKDIR_CMD}" "${FIREHOL_SPOOL_DIR}"			|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_CONFIG_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_CONFIG_DIR}"		|| exit 1
fi


# ------------------------------------------------------------------------------
# IP definitions

# IANA Reserved IPv4 address space
# Suggested by Fco.Felix Belmonte <ffelix@gescosoft.com>
# Optimized (CIDR) by Marc 'HE' Brockschmidt <marc@marcbrockschmidt.de>
# Further optimized and reduced by http://www.vergenet.net/linux/aggregate/
# The supplied get-iana.sh uses 'aggregate-flim' if it finds it in the path.
RESERVED_IPS="0.0.0.0/7 2.0.0.0/8 5.0.0.0/8 7.0.0.0/8 23.0.0.0/8 27.0.0.0/8 31.0.0.0/8 36.0.0.0/7 39.0.0.0/8 41.0.0.0/8 42.0.0.0/8 73.0.0.0/8 74.0.0.0/7 76.0.0.0/6 89.0.0.0/8 90.0.0.0/7 92.0.0.0/6 96.0.0.0/3 173.0.0.0/8 174.0.0.0/7 176.0.0.0/5 184.0.0.0/6 189.0.0.0/8 190.0.0.0/8 197.0.0.0/8 223.0.0.0/8 240.0.0.0/4"

# Private IPv4 address space
# Suggested by Fco.Felix Belmonte <ffelix@gescosoft.com>
# Revised by me according to RFC 3330. Explanation:
# 10.0.0.0/8       => RFC 1918: IANA Private Use
# 169.254.0.0/16   => Link Local
# 192.0.2.0/24     => Test Net
# 192.88.99.0/24   => RFC 3068: 6to4 anycast & RFC 2544: Benchmarking addresses
# 192.168.0.0/16   => RFC 1918: Private use
PRIVATE_IPS="10.0.0.0/8 169.254.0.0/16 172.16.0.0/12 192.0.2.0/24 192.88.99.0/24 192.168.0.0/16"

# The multicast address space
MULTICAST_IPS="224.0.0.0/4"

# A shortcut to have all the Internet unroutable addresses in one
# variable
UNROUTABLE_IPS="${RESERVED_IPS} ${PRIVATE_IPS}"

# ----------------------------------------------------------------------

# The default policy for the interface commands of the firewall.
# This can be controlled on a per interface basis using the
# policy interface subscommand. 
DEFAULT_INTERFACE_POLICY="DROP"

# Which is the filter table chains policy during firewall activation?
FIREHOL_INPUT_ACTIVATION_POLICY="ACCEPT"
FIREHOL_OUTPUT_ACTIVATION_POLICY="ACCEPT"
FIREHOL_FORWARD_ACTIVATION_POLICY="ACCEPT"

# Should we drop all INVALID packets always?
FIREHOL_DROP_INVALID=0

# What to do with unmatched packets?
# To change these, simply define them the configuration file.
UNMATCHED_INPUT_POLICY="DROP"
UNMATCHED_OUTPUT_POLICY="DROP"
UNMATCHED_ROUTER_POLICY="DROP"

# Options for iptables LOG action.
# These options will be added to all LOG actions FireHOL will generate.
# To change them, type such a line in the configuration file.
# FIREHOL_LOG_OPTIONS="--log-tcp-sequence --log-tcp-options --log-ip-options"
FIREHOL_LOG_OPTIONS=""
FIREHOL_LOG_LEVEL="warning"
FIREHOL_LOG_MODE="LOG"
FIREHOL_LOG_FREQUENCY="1/second"
FIREHOL_LOG_BURST="5"

# The client ports to be used for "default" client ports when the
# client specified is a foreign host.
# We give all ports above 1000 because a few systems (like Solaris)
# use this range.
# Note that FireHOL will ask the kernel for default client ports of
# the local host. This only applies to client ports of remote hosts.
DEFAULT_CLIENT_PORTS="1024:65535"

# Get the default client ports from the kernel configuration.
# This is formed to a range of ports to be used for all "default"
# client ports when the client specified is the localhost.
LOCAL_CLIENT_PORTS_LOW=`${SYSCTL_CMD} net.ipv4.ip_local_port_range | ${CUT_CMD} -d '=' -f 2 | ${CUT_CMD} -f 1`
LOCAL_CLIENT_PORTS_HIGH=`${SYSCTL_CMD} net.ipv4.ip_local_port_range | ${CUT_CMD} -d '=' -f 2 | ${CUT_CMD} -f 2`
LOCAL_CLIENT_PORTS="${LOCAL_CLIENT_PORTS_LOW}:${LOCAL_CLIENT_PORTS_HIGH}"


# ----------------------------------------------------------------------
# This is our version number. It is increased when the configuration
# file commands and arguments change their meaning and usage, so that
# the user will have to review it more precisely.
FIREHOL_VERSION=5


# ----------------------------------------------------------------------
# The initial line number of the configuration file.
FIREHOL_LINEID="INIT"

# Variable kernel module requirements.
# Suggested by Fco.Felix Belmonte <ffelix@gescosoft.com>
# Note that each of the complex services
# may add to this variable the kernel modules it requires.
# See rules_ftp() bellow for an example.
FIREHOL_KERNEL_MODULES=""
#
# In the configuration file you can write:
#
#                     require_kernel_module <module_name>
# 
# to have FireHOL require a specific module for the configurarion.

# Set this to 1 in the configuration file to have FireHOL complex
# services' rules load NAT kernel modules too.
FIREHOL_NAT=0

# Set this to 1 in the configuration file if routing should be enabled
# in the kernel.
FIREHOL_ROUTING=0

# Services may add themeselves to this variable so that the service "all" will
# also call them.
# By default it is empty - only rules programmers should change this.
ALL_SHOULD_ALSO_RUN=


# ------------------------------------------------------------------------------
# Various Defaults

# If set to 1, we are just going to present the resulting firewall instead of
# installing it.
# It can be changed on the command line
FIREHOL_DEBUG=0

# If set to 1, the firewall will be saved for normal iptables processing.
# It can be changed on the command line
FIREHOL_SAVE=0

# If set to 1, the firewall will be restored if you don't commit it.
# It can be changed on the command line
FIREHOL_TRY=1

# If set to 1, FireHOL enters interactive mode to answer questions.
# It can be changed on the command line
FIREHOL_EXPLAIN=0

# If set to 1, FireHOL enters a wizard mode to help the user build a firewall.
# It can be changed on the command line
FIREHOL_WIZARD=0

# If set to 0, FireHOL will not try to load the required kernel modules.
# It can be set in the configuration file.
FIREHOL_LOAD_KERNEL_MODULES=1

# If set to 1, FireHOL will output the commands of the configuration file
# with variables expanded.
FIREHOL_CONF_SHOW=1


# ------------------------------------------------------------------------------
# Keep information about the current primary command
# Primary commands are: interface, router

work_counter=0
work_cmd=
work_realcmd=("(unset)")
work_name=
work_inface=
work_outface=
work_policy="${DEFAULT_INTERFACE_POLICY}"
work_error=0
work_function="Initializing"


# ------------------------------------------------------------------------------
# Keep status information

# 0 = no errors, 1 = there were errors in the script
work_final_status=0

# This variable is used for generating dynamic chains when needed for
# combined negative statements (AND) implied by the "not" parameter
# to many FireHOL directives.
# What FireHOL is doing to accomplish this, is to produce dynamically
# a linked list of iptables chains with just one condition each, making
# the packets to traverse from chain to chain when matched, to reach
# their final destination.
FIREHOL_DYNAMIC_CHAIN_COUNTER=1

# If set to 0, FireHOL will not trust interface lo for all traffic.
# This means the admin could setup a firewall on lo.
FIREHOL_TRUST_LOOPBACK=1

# Services API version
FIREHOL_SERVICES_API="1"


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# SIMPLE SERVICES DEFINITIONS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
# The following are definitions for simple services.
# We define as "simple" the services that are implemented using a single socket,
# initiated by the client and used by the server.
#
# The following list is sorted by service name.

server_AH_ports="51/any"
client_AH_ports="any"

# Debian package proxy
server_aptproxy_ports="tcp/9999"
client_aptproxy_ports="default"

# APC UPS Server (these ports have to be accessible on all machines NOT
# directly connected to the UPS (e.g. the slaves)
server_apcupsd_ports="tcp/6544"
client_apcupsd_ports="default"

server_apcupsdnis_ports="tcp/3551"
client_apcupsdnis_ports="default"

server_asterisk_ports="tcp/5038"
client_asterisk_ports="default"

server_cups_ports="tcp/631 udp/631"
client_cups_ports="default 631"

server_cvspserver_ports="tcp/2401"
client_cvspserver_ports="default"

server_darkstat_ports="tcp/666"
client_darkstat_ports="default"

server_daytime_ports="tcp/13"
client_daytime_ports="default"

server_dcc_ports="udp/6277"
client_dcc_ports="default"

server_dcpp_ports="tcp/1412 udp/1412"
client_dcpp_ports="default"

server_dns_ports="udp/53 tcp/53"
client_dns_ports="any"

# DHCP Relaying (server is the relay server which behaves like a client
# towards the real DHCP Server); I'm not sure about this one...
server_dhcprelay_ports="udp/67"
client_dhcprelay_ports="67"

server_dict_ports="tcp/2628"
client_dict_ports="default"

# DISTCC is the distributed gcc for Gentoo
server_distcc_ports="tcp/3632"
client_distcc_ports="default"

server_eserver_ports="tcp/4661 udp/4661 udp/4665"
client_eserver_ports="any"

server_ESP_ports="50/any"
client_ESP_ports="any"

server_echo_ports="tcp/7"
client_echo_ports="default"

server_finger_ports="tcp/79"
client_finger_ports="default"

# giFT modules' ports
# Gnutella  = tcp/4302
# FastTrack = tcp/1214
# OpenFT    = tcp/2182 tcp/2472
server_gift_ports="tcp/4302 tcp/1214 tcp/2182 tcp/2472"
client_gift_ports="any"

# giFT User Interface connections
server_giftui_ports="tcp/1213"
client_giftui_ports="default"

# gkrellmd (from gkrellm.net)
server_gkrellmd_ports="tcp/19150"
client_gkrellmd_ports="default"

server_GRE_ports="47/any"
client_GRE_ports="any"

server_h323_ports="tcp/1720 tcp/1731"
client_h323_ports="default"

# We assume heartbeat uses ports in the range 690 to 699
server_heartbeat_ports="udp/690:699"
client_heartbeat_ports="default"

server_http_ports="tcp/80"
client_http_ports="default"

server_https_ports="tcp/443"
client_https_ports="default"

server_iax_ports="udp/5036"
client_iax_ports="default"

server_iax2_ports="udp/5469 udp/4569"
client_iax2_ports="default"

server_ICMP_ports="icmp/any"
client_ICMP_ports="any"

server_icmp_ports="icmp/any"
client_icmp_ports="any"
# ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} icmp"

# Squid' ICP port
server_icp_ports="udp/3130"
client_icp_ports="3130"

server_ident_ports="tcp/113"
client_ident_ports="default"

server_imap_ports="tcp/143"
client_imap_ports="default"

server_imaps_ports="tcp/993"
client_imaps_ports="default"

server_irc_ports="tcp/6667"
client_irc_ports="default"
require_irc_modules="ip_conntrack_irc"
require_irc_nat_modules="ip_nat_irc"
ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} irc"

# for IPSec Key negotiation
server_isakmp_ports="udp/500"
client_isakmp_ports="500"

server_jabber_ports="tcp/5222 tcp/5223"
client_jabber_ports="default"

server_jabberd_ports="tcp/5222 tcp/5223 tcp/5269"
client_jabberd_ports="default"

server_ldap_ports="tcp/389"
client_ldap_ports="default"

server_ldaps_ports="tcp/636"
client_ldaps_ports="default"

server_lpd_ports="tcp/515"
client_lpd_ports="721:731 default"

server_microsoft_ds_ports="tcp/445"
client_microsoft_ds_ports="default"

server_mms_ports="tcp/1755 udp/1755"
client_mms_ports="default"
require_mms_modules="ip_conntrack_mms"
require_mms_nat_modules="ip_nat_mms"
# this will produce warnings on most distribution
# because the mms module is not there:
# ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} mms"

server_msn_ports="tcp/6891"
client_msn_ports="default"

server_mysql_ports="tcp/3306"
client_mysql_ports="default"

# Veritas NetBackup
server_netbackup_ports="tcp/13701 tcp/13711 tcp/13720 tcp/13721 tcp/13724 tcp/13782 tcp/13783"
client_netbackup_ports="any"

server_netbios_ns_ports="udp/137"
client_netbios_ns_ports="default 137"

server_netbios_dgm_ports="udp/138"
client_netbios_dgm_ports="default 138"

server_netbios_ssn_ports="tcp/139"
client_netbios_ssn_ports="default"

server_nntp_ports="tcp/119"
client_nntp_ports="default"

server_nntps_ports="tcp/563"
client_nntps_ports="default"

server_ntp_ports="udp/123 tcp/123"
client_ntp_ports="123 default"

# Network UPS Tools
server_nut_ports="tcp/3493 udp/3493"
client_nut_ports="default"

# NoMachine's NX server
server_nxserver_ports="tcp/5000:5200"
client_nxserver_ports="default"

# Oracle database
server_oracle_ports="tcp/1521"
client_oracle_ports="default"

server_pop3_ports="tcp/110"
client_pop3_ports="default"

server_pop3s_ports="tcp/995"
client_pop3s_ports="default"

# Portmap clients appear to use ports bellow 1024
server_portmap_ports="udp/111 tcp/111"
client_portmap_ports="500:65535"

server_postgres_ports="tcp/5432"
client_postgres_ports="default"

# Privacy Proxy
server_privoxy_ports="tcp/8118"
client_privoxy_ports="default"

server_radius_ports="udp/1812 udp/1813"
client_radius_ports="default"

server_radiusproxy_ports="udp/1814"
client_radiusproxy_ports="default"

server_radiusold_ports="udp/1645 udp/1646"
client_radiusold_ports="default"

server_radiusoldproxy_ports="udp/1647"
client_radiusoldproxy_ports="default"

server_rdp_ports="tcp/3389"
client_rdp_ports="default"

server_rndc_ports="tcp/953"
client_rndc_ports="default"

server_rsync_ports="tcp/873 udp/873"
client_rsync_ports="default"

server_rtp_ports="udp/10000:20000"
client_rtp_ports="any"

server_sip_ports="udp/5060"
client_sip_ports="default"

server_socks_ports="tcp/1080 udp/1080"
client_socks_ports="default"

server_squid_ports="tcp/3128"
client_squid_ports="default"

server_smtp_ports="tcp/25"
client_smtp_ports="default"

server_smtps_ports="tcp/465"
client_smtps_ports="default"

server_snmp_ports="udp/161"
client_snmp_ports="default"

server_snmptrap_ports="udp/162"
client_snmptrap_ports="any"

server_ssh_ports="tcp/22"
client_ssh_ports="default"

server_stun_ports="udp/3478 udp/3479"
client_stun_ports="any"

# SMTP over SSL/TLS submission
server_submission_ports="tcp/587"
client_submission_ports="default"

# Sun RCP is an alias for service portmap
server_sunrpc_ports="${server_portmap_ports}"
client_sunrpc_ports="${client_portmap_ports}"

server_swat_ports="tcp/901"
client_swat_ports="default"

server_syslog_ports="udp/514"
client_syslog_ports="syslog default"

server_telnet_ports="tcp/23"
client_telnet_ports="default"

server_time_ports="tcp/37 udp/37"
client_time_ports="default"

server_upnp_ports="udp/1900 tcp/2869"
client_upnp_ports="default"

server_uucp_ports="tcp/540"
client_uucp_ports="default"

server_whois_ports="tcp/43"
client_whois_ports="default"

server_vmware_ports="tcp/902"
client_vmware_ports="default"

server_vmwareauth_ports="tcp/903"
client_vmwareauth_ports="default"

server_vmwareweb_ports="tcp/8222"
client_vmwareweb_ports="default"

server_vnc_ports="tcp/5900:5903"
client_vnc_ports="default"

server_webcache_ports="tcp/8080"
client_webcache_ports="default"

server_webmin_ports="tcp/10000"
client_webmin_ports="default"

server_xdmcp_ports="udp/177"
client_xdmcp_ports="default"


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# COMPLEX SERVICES DEFINITIONS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
# The following are definitions for complex services.
# We define as "complex" the services that are implemented using multiple sockets.

# Each function bellow is organized in three parts:
# 1) A Header, common to each and every function
# 2) The rules required for the INPUT of the server
# 3) The rules required for the OUTPUT of the server
#
# The Header part, together with the "reverse" keyword can reverse the rules so
# that if we are implementing a client the INPUT will become OUTPUT and vice versa.
#
# In most the cases the input and output rules are the same with the following
# differences:
#
# a) The output rules begin with the "reverse" keyword, which reverses:
#    inface/outface, src/dst, sport/dport
# b) The output rules use ${out}_${mychain} instead of ${in}_${mychain}
# c) The state rules match the client operation, not the server.


# --- DHCP --------------------------------------------------------------------

rules_dhcp() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for DHCP (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "68" dport "67" || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "68" dport "67" || return 1
	
	return 0
}


# --- EMULE --------------------------------------------------------------------

rules_emule() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incomming to server tcp/4662
	set_work_function "Setting up rules for EMULE/client-to-server tcp/4662 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4662 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4662 state ESTABLISHED     || return 1
	
	# allow outgoing to client tcp/4662
	set_work_function "Setting up rules for EMULE/server-to-client tcp/4662 (${type})"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" dport any sport 4662 state NEW,ESTABLISHED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" dport any sport 4662 state ESTABLISHED     || return 1
	
	# allow incomming to server udp/4672
	set_work_function "Setting up rules for EMULE/client-to-server udp/4672 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport any dport 4672 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport any dport 4672 state ESTABLISHED     || return 1
	
	# allow outgoing to client udp/4672
	set_work_function "Setting up rules for EMULE/server-to-client udp/4672 (${type})"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" dport any sport 4672 state NEW,ESTABLISHED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" dport any sport 4672 state ESTABLISHED     || return 1
	
	# allow incomming to server tcp/4661
	set_work_function "Setting up rules for EMULE/client-to-server tcp/4661 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4661 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4661 state ESTABLISHED     || return 1
	
	# allow incomming to server udp/4665
	set_work_function "Setting up rules for EMULE/client-to-server udp/4665 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport any dport 4665 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport any dport 4665 state ESTABLISHED     || return 1
	
	return 0
}


# --- HYLAFAX ------------------------------------------------------------------
# Written by: Franscisco Javier Felix <ffelix@gescosoft.com>

rules_hylafax() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incomming to server tcp/4559
	set_work_function "Setting up rules for HYLAFAX/client-to-server tcp/4559 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4559 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4559 state ESTABLISHED     || return 1
	
	# allow outgoing to client from server tcp/4558
	set_work_function "Setting up rules for HYLAFAX/server-to-client from server tcp/4558 (${type})"
	rule ${out}        action "$@" chain "${out}_${mychain}" proto "tcp" sport 4558 dport any state NEW,ESTABLISHED || return 1
        rule ${in} reverse action "$@" chain "${in}_${mychain}"  proto "tcp" sport 4558 dport any state ESTABLISHED     || return 1
	
	return 0
}


# --- SAMBA --------------------------------------------------------------------

rules_samba() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-NS (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "137 ${client_ports}"  dport 137 state NEW,ESTABLISHED || return 1
	
	# NETBIOS initiates based on the broadcast address of an interface
	# (request goes to broadcast address) but the server responds from
	# its own IP address. This makes the server samba accept statement
	# drop the server reply.
	# Bellow is a hack, that allows a linux samba server to respond
	# correctly, as it allows new outgoing connections from the well
	# known netbios-ns port to the clients high ports.
	# For clients and routers this hack is not applied because it
	# would be a huge security hole.
	if [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
	then
		rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "137 ${client_ports}"  dport 137 state NEW,ESTABLISHED || return 1
	else
		rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "137 ${client_ports}"  dport 137 state ESTABLISHED     || return 1
	fi
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-DGM (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "138 ${client_ports}" dport 138 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "138 ${client_ports}" dport 138 state ESTABLISHED     || return 1
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-SSN (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport 139 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport 139 state ESTABLISHED     || return 1
	
	set_work_function "Setting up rules for SAMBA/MICROSOFT_DS (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport 445 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport 445 state ESTABLISHED     || return 1
	
	return 0
}


# --- PPTP --------------------------------------------------------------------

rules_pptp() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for PPTP/initial connection (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport "1723" state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport "1723" state ESTABLISHED     || return 1
	
	set_work_function "Setting up rules for PPTP/tunnel GRE traffic (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "47"	|| return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "47"	|| return 1
	
	return 0
}


# --- NFS ----------------------------------------------------------------------

rules_nfs() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# This command requires in the client or route subcommands,
	# the first argument after the policy/action is a dst.
	
	local action="${1}"; shift
	local servers="localhost"
	
	if [ "${type}" = "client" -o ! "${work_cmd}" = "interface" ]
	then
		case "${1}" in
			dst|DST|destination|DESTINATION)
				shift
				local servers="${1}"
				shift
				;;
				
			*)
				error "Please re-phrase to: ${type} nfs ${action} dst <NFS_SERVER> [other rules]"
				return 1
				;;
		esac
	fi
	
	local x=
	for x in ${servers}
	do
		local tmp="${FIREHOL_DIR}/firehol.rpcinfo.$$.${RANDOM}"
		
		set_work_function "Getting RPC information from server '${x}'"
		
		rpcinfo -p ${x} >"${tmp}"
		if [ $? -gt 0 -o ! -s "${tmp}" ]
		then
			error "Cannot get rpcinfo from host '${x}' (using the previous firewall rules)"
			${RM_CMD} -f "${tmp}"
			return 1
		fi
		
		local server_rquotad_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " rquotad$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_mountd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " mountd$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_lockd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " nlockmgr$" | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_nfsd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " nfs$"       | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		
		test -z "${server_mountd_ports}" && error "Cannot find mountd ports for nfs server '${x}'" && return 1
		test -z "${server_lockd_ports}"  && error "Cannot find lockd ports for nfs server '${x}'" && return 1
		test -z "${server_nfsd_ports}"   && error "Cannot find nfsd ports for nfs server '${x}'" && return 1
		
		local dst=
		if [ ! "${x}" = "localhost" ]
		then
			dst="dst ${x}"
		fi
		
		if [ ! -z "${server_rquotad_ports}" ]
		then
			set_work_function "Processing rquotad rules for server '${x}'"
			rules_custom "${mychain}" "${type}" nfs-rquotad "${server_rquotad_ports}" "500:65535" "${action}" $dst "$@"
		fi
		
		set_work_function "Processing mountd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-mountd "${server_mountd_ports}" "500:65535" "${action}" $dst "$@"
		
		set_work_function "Processing lockd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-lockd "${server_lockd_ports}" "500:65535" "${action}" $dst "$@"
		
		set_work_function "Processing nfsd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-nfsd   "${server_nfsd_ports}"   "500:65535" "${action}" $dst "$@"
		
		${RM_CMD} -f "${tmp}"
		
		echo >&2 ""
		echo >&2 "WARNING:"
		echo >&2 "This firewall must be restarted if NFS server ${x} is restarted!"
		echo >&2 ""
	done
	
	return 0
}


# --- NIS ----------------------------------------------------------------------
# These rules work for client access only!
#
# Pushing changes to slave servers won't work if these rules are active
# somewhere between the master and its slaves, because it is impossible to
# predict the ports where "yppush" will be listening on each push.
#
# Pulling changes directly on the slaves will work, and could be improved
# performance-wise if these rules are modified to open "fypxfrd". This wasn't
# done because it doesn't make that much sense since pushing changes on the
# master server is the most common, and recommended, way to replicate maps.
#
# Created by Carlos Rodrigues <crlf@users.sourceforge.net>
# Feature Requests item #1050951 <https://sourceforge.net/tracker/?func=detail&atid=487695&aid=1050951&group_id=58425>

rules_nis() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# This command requires in the client or route subcommands,
	# the first argument after the policy/action is a dst.
	
	local action="${1}"; shift
	local servers="localhost"
	
	if [ "${type}" = "client" -o ! "${work_cmd}" = "interface" ]
	then
		case "${1}" in
			dst|DST|destination|DESTINATION)
				shift
				local servers="${1}"
				shift
				;;
				
			*)
				error "Please re-phrase to: ${type} nis ${action} dst <NIS_SERVER> [other rules]"
				return 1
				;;
		esac
	fi
	
	local x=
	for x in ${servers}
	do
		local tmp="${FIREHOL_DIR}/firehol.rpcinfo.$$.${RANDOM}"
		
		set_work_function "Getting RPC information from server '${x}'"
		
		rpcinfo -p ${x} >"${tmp}"
		if [ $? -gt 0 -o ! -s "${tmp}" ]
		then
			error "Cannot get rpcinfo from host '${x}' (using the previous firewall rules)"
			${RM_CMD} -f "${tmp}"
			return 1
		fi
		
		local server_ypserv_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " ypserv$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_yppasswdd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " yppasswdd$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		
		test -z "${server_ypserv_ports}" && error "Cannot find ypserv ports for nis server '${x}'" && return 1
		
		local dst=
		if [ ! "${x}" = "localhost" ]
		then
			dst="dst ${x}"
		fi
		
		if [ ! -z "${server_yppasswd_ports}" ]
		then
			set_work_function "Processing yppasswd rules for server '${x}'"
			rules_custom "${mychain}" "${type}" nis-yppasswd "${server_yppasswdd_ports}" "500:65535" "${action}" $dst "$@"
		fi
		
		set_work_function "Processing ypserv rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nis-ypserv "${server_ypserv_ports}" "500:65535" "${action}" $dst "$@"
		
		${RM_CMD} -f "${tmp}"
		
		echo >&2 ""
		echo >&2 "WARNING:"
		echo >&2 "This firewall must be restarted if NIS server ${x} is restarted!"
		echo >&2 ""
	done
	
	return 0
}


# --- AMANDA -------------------------------------------------------------------
FIREHOL_AMANDA_PORTS="850:859"

rules_amanda() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "*** AMANDA: See http://amanda.sourceforge.net/fom-serve/cache/139.html"
	
	
	set_work_function "Setting up rules for initial amanda server-to-client connection"
	rule ${out}        action "$@" chain "${out}_${mychain}" proto "udp" dport 10080 state NEW,ESTABLISHED || return 1
	rule ${in} reverse action "$@" chain "${in}_${mychain}"  proto "udp" dport 10080 state ESTABLISHED     || return 1
	
	
	set_work_function "Setting up rules for amanda data exchange client-to-server"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp udp" dport "${FIREHOL_AMANDA_PORTS}" state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp udp" dport "${FIREHOL_AMANDA_PORTS}" state ESTABLISHED     || return 1
	
	return 0
}

# --- FTP ----------------------------------------------------------------------

ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} ftp"

rules_ftp() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# For an explanation of how FTP connections work, see
	# http://slacksite.com/other/ftp.html
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming, and established outgoing
	# accept port ftp new connections
	set_work_function "Setting up rules for initial FTP connection ${type}"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${client_ports}" dport ftp state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${client_ports}" dport ftp state ESTABLISHED     || return 1
	
	# Active FTP
	# send port ftp-data related connections
	set_work_function "Setting up rules for Active FTP ${type}"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${client_ports}" dport ftp-data state ESTABLISHED,RELATED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${client_ports}" dport ftp-data state ESTABLISHED         || return 1
	
	# ----------------------------------------------------------------------
	
	# A hack for Passive FTP only
	local s_client_ports="${DEFAULT_CLIENT_PORTS}"
	local c_client_ports="${DEFAULT_CLIENT_PORTS}"
	
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		c_client_ports="${LOCAL_CLIENT_PORTS}"
	elif [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
	then
		s_client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# Passive FTP
	# accept high-ports related connections
	set_work_function "Setting up rules for Passive FTP ${type}"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED,RELATED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED         || return 1
	
	require_kernel_module ip_conntrack_ftp
	test ${FIREHOL_NAT} -eq 1 && require_kernel_module ip_nat_ftp
	
	return 0
}


# --- TFTP ---------------------------------------------------------------------
# Written by: Goetz Bock <bock@blacknet.de>

rules_tftp() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ---------------------------------------------------------------------
	# TFTP is a broken protokol. It works like this:
	#
	# 1. The client sends from a high port (a) to the server's tftp port an
	#    udp packet with "give me file 'bla'".
	#
	# 2. The server replies from a high port (b) to the highport the client
	#    used (a) with "this is part 0 if your file"
	#
	# 3. The client now has to send a reply (from his highport a) to the
	#    servers high port (b): "got part 0, send next part 1".
	#
	# 4. repeat 2. and 3. till file transmitted
	
	# allow the initial TFTP connection
	set_work_function "Setting up rules for initial TFTP connection (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "${client_ports}" dport tftp state NEW,ESTABLISHED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "${client_ports}" dport tftp state ESTABLISHED     || return 1
	
	# We now need both server and client port ranges
	local s_client_ports="${DEFAULT_CLIENT_PORTS}"
	local c_client_ports="${DEFAULT_CLIENT_PORTS}"
	
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		c_client_ports="${LOCAL_CLIENT_PORTS}"
	elif [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
	then
		s_client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# allow the TFTP server to establish a new connection to the client
	set_work_function "Setting up rules for server-to-client TFTP connection (${type})"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "${c_client_ports}" dport "${s_client_ports}" state RELATED,ESTABLISHED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED         || return 1
	
	require_kernel_module ip_conntrack_tftp
	test ${FIREHOL_NAT} -eq 1 && require_kernel_module ip_nat_tftp
	
	return 0
}


# --- PING ---------------------------------------------------------------------

rules_ping() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incoming new and established PING packets
	rule ${in} action "$@" chain "${in}_${mychain}" proto icmp custom "--icmp-type echo-request" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto icmp custom "--icmp-type echo-reply" state ESTABLISHED || return 1
	
	return 0
}

# --- TIMESTAMP ----------------------------------------------------------------

rules_timestamp() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incoming new and established PING packets
	rule ${in} action "$@" chain "${in}_${mychain}" proto icmp custom "--icmp-type timestamp-request" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto icmp custom "--icmp-type timestamp-reply" state ESTABLISHED || return 1
	
	return 0
}


# --- P2P ----------------------------------------------------------------------

rules_p2p() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# Remove the action from the arguments.
	shift
	
	do_in() {
		# allow new and established incoming packets
		rule ${in} action "$@" chain "${in}_${mychain}" state NEW,ESTABLISHED || return 1
	}
	
	do_out() {
		# allow outgoing established packets
		rule ${out} reverse action "$@" chain "${out}_${mychain}" state NEW,ESTABLISHED || return 1
	}
	
	# Kazaa
	# Check: http://www.derkeiler.com/Mailing-Lists/Firewall-Wizards/2003-06/0152.html
	# New clients will try to use port 80 - use a proxy to filter this too.
	set_work_function "Setting up rules for Kazaa (${type})"
	do_in  drop "$@" proto "tcp udp" sport 1214
	do_in  drop "$@" proto "tcp udp" dport 1214
	do_out drop "$@" proto "tcp udp" dport 1214
	do_out drop "$@" proto "tcp udp" sport 1214
	
	# Gnutella
	
	# Mldonkey
	
	# Emule
	
	# audiogalaxy
	
	# hotline
	
	
	return 0
}


# --- ALL ----------------------------------------------------------------------

rules_all() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" state ESTABLISHED || return 1
	
	local ser=
	for ser in ${ALL_SHOULD_ALSO_RUN}
	do
		"${type}" ${ser} "$@" || return 1
	done
	
	return 0
}


# --- ANY ----------------------------------------------------------------------

rules_any() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local name="${1}"; shift # a special case: service any gets a name
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" state ESTABLISHED || return 1
	
	return 0
}


# --- ANYSTATELESS -------------------------------------------------------------

rules_anystateless() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local name="${1}"; shift # a special case: service any gets a name
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" || return 1
	
	return 0
}


# --- MULTICAST ----------------------------------------------------------------

rules_multicast() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# match multicast packets in both directions
	rule ${out} action "$@" chain "${out}_${mychain}" dst "224.0.0.0/8" proto 2 || return 1
	rule ${in} reverse action "$@" chain "${in}_${mychain}" src "224.0.0.0/8" proto 2 || return 1
	
	return 0
}


# --- CUSTOM -------------------------------------------------------------------

rules_custom() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	
	local server="${1}"; shift
	local my_server_ports="${1}"; shift
	local my_client_ports="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	local sp=
	for sp in ${my_server_ports}
	do
		local proto=
		local sport=
		
		IFS="/" read proto sport <<EOF
$sp
EOF
		
		local cp=
		for cp in ${my_client_ports}
		do
			local cport=
			case ${cp} in
				default)
					cport="${client_ports}"
					;;
					
				*)	cport="${cp}"
					;;
			esac
			
			# allow new and established incoming packets
			rule ${in} action "$@" chain "${in}_${mychain}" proto "${proto}" sport "${cport}" dport "${sport}" state NEW,ESTABLISHED || return 1
			
			# allow outgoing established packets
			rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "${proto}" sport "${cport}" dport "${sport}" state ESTABLISHED || return 1
		done
	done
	
	return 0
}


# ------------------------------------------------------------------------------

# The caller may need just our services definitions
if [ "$1" = "gimme-the-services-defs" ]
then
	return 0
	exit 1
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# SUPPORT FOR EXTERNAL DEFINITIONS OF SERVICES
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# Load all the services.
# All these files should start with: #FHVER: 1
cd "${FIREHOL_CONFIG_DIR}/services" || exit 1
for f in `ls *.conf 2>/dev/null`
do
	cd "${FIREHOL_CONFIG_DIR}/services" || exit 1
	
	if [ ! -O "${f}" ]
	then
		echo >&2 " >>> Ignoring service in '${FIREHOL_CONFIG_DIR}/services/${f}' because it is not owned by root."
		continue
	fi
	
	n=`"${HEAD_CMD}" -n 1 "${f}" | "${CUT_CMD}" -d ':' -f 2`
	"${EXPR_CMD}" ${n} + 0 >/dev/null 2>&1
	if [ $? -ne 0 ]
	then
		echo >&2 " >>> Ignoring service in '${FIREHOL_CONFIG_DIR}/services/${f}' due to malformed header."
	elif [ ${n} -ne ${FIREHOL_SERVICES_API} ]
	then
		echo >&2 " >>> Ignoring service '${FIREHOL_CONFIG_DIR}/services/${f}' due to incompatible API version."
	else
		n=`"${HEAD_CMD}" -n 1 "${f}" | "${CUT_CMD}" -d ':' -f 3`
		"${EXPR_CMD}" ${n} + 0 >/dev/null 2>&1
		if [ $? -ne 0 ]
		then
			echo >&2 " >>> Ignoring service in '${FIREHOL_CONFIG_DIR}/services/${f}' due to malformed API minor number."
		else
			if [ ${n} -gt ${FIREHOL_MINOR_VERSION} ]
			then
				echo >&2 " >>> Ignoring service in '${FIREHOL_CONFIG_DIR}/services/${f}' because the required MINOR version (${n}) is higher than the one provided by FireHOL (${FIREHOL_MINOR_VERSION})."
			else
				source ${f}
				ret=$?
				if [ ${ret} -ne 0 ]
				then
					echo >&2 " >>> Service in '${FIREHOL_CONFIG_DIR}/services/${f}' returned code ${ret}."
					continue
				fi
			fi
		fi
	fi
done
cd "${FIREHOL_DEFAULT_WORKING_DIRECTORY}" || exit 1


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# HELPER FUNCTIONS BELLOW THIS POINT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# Fetch a URL and output it to the standard output.
firehol_wget() {
	local url="${1}"
	
	require_cmd wget curl || error "Cannot find 'wget' or 'curl' in the path."
	
	if [ ! -z "${WGET_CMD}" ]
	then
		${WGET_CMD} -O - "${url}" 2>/dev/null
		return $?
	elif [ ! -z "${CURL_CMD}" ]
	then
		${CURL_CMD} -s "${url}"
		return $?
	fi
	
	error "Cannot use either 'wget' or 'curl' to fetch '${url}'."
	return 1
}

FIREHOL_ECN_SHAME_URL="http://urchin.earth.li/cgi-bin/ecn.pl?output=ip"
ecn_shame() {
	work_realcmd_helper ${FUNCNAME} "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	if [ `${CAT_CMD} /proc/sys/net/ipv4/tcp_ecn` -eq 1 ]
	then
		set_work_function "Fetching '${FIREHOL_ECN_SHAME_URL}'."
		
		# Reads in list of ip address and makes iptables rules to drop ecn
		# from packets destined for those hosts.
		# http://urchin.earth.li/ecn/
		
		local tmp="${FIREHOL_DIR}/ecn_shame.ips"
		
		firehol_wget "${FIREHOL_ECN_SHAME_URL}" | ${SORT_CMD} | ${UNIQ_CMD} >"${tmp}"
		if [ $? -ne 0 -o ! -s "${tmp}" ]
		then
			softwarning "Cannot fetch '${FIREHOL_ECN_SHAME_URL}'."
		else
			${MV_CMD} -f "${tmp}" "${FIREHOL_SPOOL_DIR}/ecn_shame.ips"
		fi
		
		set_work_function "Removing ECN for all communication from/to SHAME ECN list."
		
		local count=0
		for ip in `${CAT_CMD} "${FIREHOL_SPOOL_DIR}/ecn_shame.ips"`
		do
			local count=$[count + 1]
			iptables -t mangle -A POSTROUTING -p tcp -d ${ip} -j ECN --ecn-tcp-remove
		done
		
		test ${count} -eq 0 && softwarning "No ECN SHAME IPs found." && return 1
	else
		softwarning "TCP_ECN is not enabled in the kernel. ECN_SHAME helper is ignored."
		return 0
	fi
	return 0
}

masquerade() {
	work_realcmd_helper ${FUNCNAME} "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local f="${work_outface}"
	test "${1}" = "reverse" && f="${work_inface}" && shift
	
	test -z "${f}" && local f="${1}" && shift
	
	test -z "${f}" && error "masquerade requires an interface set or as argument" && return 1
	
	set_work_function "Initializing masquerade on interface '${f}'"
	
	rule noowner table nat chain POSTROUTING "$@" inface any outface "${f}" action MASQUERADE || return 1
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

transparent_proxy_count=0
transparent_proxy() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local ports="${1}"; shift
	local redirect="${1}"; shift
	local user="${1}"; shift
	
	test -z "${redirect}" && error "Proxy listening port is empty" && return 1
	
	transparent_proxy_count=$[transparent_proxy_count + 1]
	
	set_work_function "Setting up rules for catching routed tcp/${ports} traffic"
	
	create_chain nat "in_trproxy.${transparent_proxy_count}" PREROUTING noowner "$@" outface any proto tcp sport "${DEFAULT_CLIENT_PORTS}" dport "${ports}" || return 1
#	rule table nat chain "in_trproxy.${transparent_proxy_count}" proto tcp dport "${ports}" action REDIRECT to-port ${redirect} || return 1
	rule table nat chain "in_trproxy.${transparent_proxy_count}" proto tcp action REDIRECT to-port ${redirect} || return 1
	
	if [ ! -z "${user}" ]
	then
		set_work_function "Setting up rules for catching outgoing tcp/${ports} traffic"
		create_chain nat "out_trproxy.${transparent_proxy_count}" OUTPUT "$@" uid not "${user}" nosoftwarnings inface any outface any src any proto tcp sport "${LOCAL_CLIENT_PORTS}" dport "${ports}" || return 1
		
		# do not catch traffic for localhost servers
		rule table nat chain "out_trproxy.${transparent_proxy_count}" dst "127.0.0.1" action RETURN || return 1
		
#		rule table nat chain "out_trproxy.${transparent_proxy_count}" proto tcp dport "${ports}" action REDIRECT to-port ${redirect} || return 1
		rule table nat chain "out_trproxy.${transparent_proxy_count}" proto tcp action REDIRECT to-port ${redirect} || return 1
	fi
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

transparent_squid() {
	transparent_proxy 80 "$@"
}

nat_count=0
nat_helper() {
#	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "NAT cannot be used in '${work_cmd}'. Put all NAT related commands before any '${work_cmd}' definition."; return 1 )
	
	local type="${1}"; shift
	local to="${1}";   shift
	
	nat_count=$[nat_count + 1]
	
	set_work_function -ne "Setting up rules for NAT type: '${type}'"
	
	case ${type} in
		to-source)
			create_chain nat "nat.${nat_count}" POSTROUTING nolog "$@" inface any || return 1
			local action=snat
			;;
		
		to-destination)
			create_chain nat "nat.${nat_count}" PREROUTING noowner nolog "$@" outface any || return 1
			local action=dnat
			;;
			
		redirect-to)
			create_chain nat "nat.${nat_count}" PREROUTING noowner nolog "$@" outface any || return 1
			local action=redirect
			;;
			
		*)
			error "$FUNCNAME requires a type (i.e. to-source, to-destination, redirect-to, etc) as its first argument. '${type}' is not understood."
			return 1
			;;
	esac
	
	
	set_work_function "Taking the NAT action: '${action}'"
	
	# we now need to keep the protocol
	rule table nat chain "nat.${nat_count}" noowner "$@" action "${action}" to "${to}" nosoftwarnings src any dst any inface any outface any sport any dport any || return 1
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

nat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	nat_helper "$@"
}

snat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" && local to="${1}" && shift
	
	nat_helper "to-source" "${to}" "$@"
}

dnat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" && local to="${1}" && shift
	
	nat_helper "to-destination" "${to}" "$@"
}

redirect() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" -o "${to}" = "to-port" && local to="${1}" && shift
	
	nat_helper "redirect-to" "${to}" "$@"
}

wrongmac_chain=0
mac() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	if [ ${wrongmac_chain} -eq 0 ]
	then
		set_work_function "Creating the MAC-MISSMATCH chain (only once)"
		
		iptables -t filter -N WRONGMAC
		rule table filter chain WRONGMAC loglimit "MAC MISSMATCH" action DROP || return 1
		
		wrongmac_chain=1
	fi
	
	set_work_function "If the source IP ${1} does not match MAC ${2}, drop the packet"
	
	iptables -t filter -A INPUT   -s "${1}" -m mac --mac-source ! "${2}" -j WRONGMAC
	iptables -t filter -A FORWARD -s "${1}" -m mac --mac-source ! "${2}" -j WRONGMAC
	
	return 0
}

# blacklist creates two types of blacklists: unidirectional or bidirectional
blacklist_chain=0
blacklist() {
	work_realcmd_helper ${FUNCNAME} "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local full=1
	if [ "${1}" = "them" -o "${1}" = "him" -o "${1}" = "her" -o "${1}" = "it" -o "${1}" = "this" -o "${1}" = "these"  -o "${1}" = "input" ]
	then
		shift
		full=0
	elif [ "${1}" = "all" -o "${1}" = "full" ]
	then
		shift
		full=1
	fi
	
	if [ ${blacklist_chain} -eq 0 ]
	then
		set_work_function "Generating blacklist chains"
		
		# Blacklist INPUT unidirectional
		iptables -t filter -N BL_IN_UNI	# INPUT
		iptables -A BL_IN_UNI -m state --state NEW -j DROP
		
		# No need for OUTPUT/FORWARD unidirectional
		
		# Blacklist INPUT bidirectional
		iptables -t filter -N BL_IN_BI	# INPUT
		iptables -A BL_IN_BI -j DROP
		
		# Blacklist OUTPUT/FORWARD bidirectional
		iptables -t filter -N BL_OUT_BI	# OUTPUT and FORWARD
		iptables -A BL_OUT_BI -p tcp -j REJECT --reject-with tcp-reset
		iptables -A BL_OUT_BI -j REJECT --reject-with icmp-host-unreachable
		
		blacklist_chain=1
	fi
	
	set_work_function "Generating blacklist rules"
	
	local z=
	for z in $@
	do
		local x=
		for x in ${z}
		do
			set_work_function "Blacklisting '${x}'"
			
			if [ ${full} -eq 1 ]
			then
				iptables -I INPUT   -s ${x} -j BL_IN_BI
				iptables -I FORWARD -s ${x} -j BL_IN_BI
				
				iptables -I OUTPUT  -d ${x} -j BL_OUT_BI
				iptables -I FORWARD -d ${x} -j BL_OUT_BI  
			else
				iptables -I INPUT   -s ${x} -j BL_IN_UNI
				iptables -I FORWARD -s ${x} -j BL_IN_UNI
			fi
		done
	done
	
	return 0
}

mark_count=0
mark() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local num="${1}"; shift
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	mark_count=$[mark_count + 1]
	
	set_work_function "Setting up rules for MARK"
	
	create_chain mangle "mark.${mark_count}" "${where}" "$@" || return 1
	iptables -t mangle -A "mark.${mark_count}" -j MARK --set-mark ${num}
	
	return 0
}

tos_count=0
tos() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local num="${1}"; shift
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	tos_count=$[tos_count + 1]
	
	set_work_function "Setting up rules for TOS"
	
	create_chain mangle "tos.${tos_count}" "${where}" "$@" || return 1
	iptables -t mangle -A "tos.${tos_count}" -j TOS --set-tos ${num}
	
	return 0
}

dscp_count=0
dscp() {
	work_realcmd=($FUNCNAME "$@")
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local value="${1}"; shift
	local class=""
	
	if [ "${value}" = "class" ]
	then
		local value=""
		local class="${1}"; shift
	fi
	
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	dscp_count=$[dscp_count + 1]
	
	set_work_function "Setting up rules for setting DSCP"
	
	create_chain mangle "dscp.${dscp_count}" "${where}" "$@" || return 1
	
	if [ ! -z "${class}" ]
	then
		iptables -t mangle -A "dscp.${dscp_count}" -j DSCP --set-dscp-class ${class}
	else
		iptables -t mangle -A "dscp.${dscp_count}" -j DSCP --set-dscp ${value}
	fi
	
	return 0
}

tcpmss() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	# work only if this helper is called before any primary command
	# or within routers.
	if [ -z "${work_cmd}" -o "${work_cmd}" = "router" ]
	then
		local chains="FORWARD"
		
		test ! -z "${work_cmd}" && chains="in_${work_name} out_${work_name}"
		
		for tcmpmss_chain in ${chains}
		do
			case $1 in
				auto)
					iptables -A "${tcmpmss_chain}" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
					;;
					
				[0-9]*)
					iptables -A "${tcmpmss_chain}" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss $1
					;;
				
				*)
					error "$FUNCNAME requires either the word 'auto' or a numeric argument."
					return 1
					;;
			esac
		done
	else
		error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition or in 'router' definitions."
		return 1
	fi
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - Primary commands
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Check the version required by the configuration file
# WHY:
# We have to make sure the configuration file has been written for this version
# of FireHOL. Note that the version command does not actually check the version
# of firehol.sh. It checks only its release number (R5 currently).

version() {
        work_realcmd_helper ${FUNCNAME} "$@"
	
	if [ ${1} -gt ${FIREHOL_VERSION} ]
	then
		error "Wrong version. FireHOL is v${FIREHOL_VERSION}, your script requires v${1}."
	fi
}


# ------------------------------------------------------------------------------
# PRIMARY COMMAND: interface
# Setup rules specific to an interface (physical or logical)

interface() {
        work_realcmd_primary ${FUNCNAME} "$@"
	
	# --- close any open command ---
	
	close_cmd || return 1
	
	
	# --- test prerequisites ---
	
	require_work clear || return 1
	set_work_function -ne "Initializing $FUNCNAME"
	
	
	# --- get paramaters and validate them ---
	
	# Get the interface
	local inface="${1}"; shift
	test -z "${inface}" && error "real interface is not set" && return 1
	
	# Get the name for this interface
	local name="${1}"; shift
	test -z "${name}" && error "$FUNCNAME name is not set" && return 1
	
	
	# --- do the job ---
	
	work_cmd="${FUNCNAME}"
	work_name="${name}"
	work_realcmd=("(unset)")
	
	set_work_function -ne "Initializing $FUNCNAME '${work_name}'"
	
	create_chain filter "in_${work_name}" INPUT in set_work_inface "$@" inface "${inface}" outface any || return 1
	create_chain filter "out_${work_name}" OUTPUT out set_work_outface reverse "$@" inface "${inface}" outface any || return 1
	
	return 0
}


router() {
        work_realcmd_helper ${FUNCNAME} "$@"
	
	# --- close any open command ---
	
	close_cmd || return 1
	
	
	# --- test prerequisites ---
	
	require_work clear || return 1
	set_work_function -ne "Initializing $FUNCNAME"
	
	
	# --- get paramaters and validate them ---
	
	# Get the name for this router
	local name="${1}"; shift
	test -z "${name}" && error "$FUNCNAME name is not set" && return 1
	
	
	# --- do the job ---
	
	work_cmd="${FUNCNAME}"
	work_name="${name}"
	work_realcmd=("(unset)")
	
	set_work_function -ne "Initializing $FUNCNAME '${work_name}'"
	
	create_chain filter "in_${work_name}" FORWARD in set_work_inface set_work_outface "$@" || return 1
	create_chain filter "out_${work_name}" FORWARD out reverse "$@" || return 1
	
	FIREHOL_ROUTING=1
	
	return 0
}

postprocess() {
#       work_realcmd_helper ${FUNCNAME} "$@"
	
	local check="error"
	test "A${1}" = "A-ne"   && shift && local check="none"
	test "A${1}" = "A-warn" && shift && local check="warn"
	
	test ${FIREHOL_DEBUG}   -eq 1 && local check="none"
	test ${FIREHOL_EXPLAIN} -eq 1 && local check="none"
	
	if [ ! ${check} = "none" ]
	then
		printf "runcmd '${check}' '${FIREHOL_LINEID}' " >>${FIREHOL_OUTPUT}
	fi
	
	printf "%q " "$@" >>${FIREHOL_OUTPUT}
	printf "\n" >>${FIREHOL_OUTPUT}
	
	if [ ${FIREHOL_EXPLAIN} -eq 1 ]
	then
		${CAT_CMD} ${FIREHOL_OUTPUT}
		${RM_CMD} -f ${FIREHOL_OUTPUT}
	fi
	
	return 0
}

runcmd() {
	local check="${1}"; shift
	local line="${1}"; shift
	local cmd="${1}"; shift
	
	"${cmd}" "$@" >${FIREHOL_OUTPUT}.log 2>&1
	local r=$?
	test ${r} -gt 0 && runtime_error ${check} ${r} ${line} "${cmd}" "$@"
	
	return 0
}

FIREHOL_COMMAND_COUNTER=0
iptables() {
#       work_realcmd_helper ${FUNCNAME} "$@"
	
	postprocess "${IPTABLES_CMD}" "$@"
	FIREHOL_COMMAND_COUNTER=$[FIREHOL_COMMAND_COUNTER + 1]
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - Sub-commands
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Change the policy of an interface
# WHY:
# Not all interfaces have the same policy. The admin must have control over it.
# Here we just set what the admin wants. At the interface finalization we
# produce the iptables rules.

policy() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set interface || return 1
	
	set_work_function "Setting interface '${work_inface}' (${work_name}) policy to ${1}"
	work_policy="$*"
	
	return 0
}

server() {
	work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	smart_function server "$@"
	return $?
}

client() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	smart_function client "$@"
	return $?
}

route() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set router || return 1
	smart_function server "$@"
	return $?
}


# --- protection ---------------------------------------------------------------

protection() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	
	local in="in"
	local prface="${work_inface}"
	
	local pre="pr"
	local reverse=
	if [ "${1}" = "reverse" ]
	then
		local reverse="reverse"	# needed to recursion
		local pre="prr"		# in case a router has protections
					# both ways, the second needs to
					# have different chain names
					
		local in="out"		# reverse the interface
		
		prface="${work_outface}"
		shift
	fi
	
	local type="${1}"
	local rate="${2}"
	local burst="${3}"
	
	test -z "${rate}"  && rate="100/s"
	test -z "${burst}" && burst="50"
	
	set_work_function -ne "Generating protections on '${prface}' for ${work_cmd} '${work_name}'"
	
	local x=
	for x in ${type}
	do
		case "${x}" in
			none|NONE)
				return 0
				;;
			
			strong|STRONG|full|FULL|all|ALL)
				protection ${reverse} "invalid fragments new-tcp-w/o-syn icmp-floods syn-floods malformed-xmas malformed-null malformed-bad" "${rate}" "${burst}"
				return $?
				;;
				
			invalid|INVALID)
				iptables -A "${in}_${work_name}" -m state --state INVALID -j DROP				|| return 1
				;;
				
			fragments|FRAGMENTS)
				local mychain="${pre}_${work_name}_fragments"
				create_chain filter "${mychain}" "${in}_${work_name}" in custom "-f"				|| return 1
				
				set_work_function "Generating rules to be protected from packet fragments on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "PACKET FRAGMENTS" action drop 				|| return 1
				;;
				
			new-tcp-w/o-syn|NEW-TCP-W/O-SYN)
				local mychain="${pre}_${work_name}_nosyn"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp state NEW custom "! --syn"	|| return 1
				
				set_work_function "Generating rules to be protected from new TCP connections without the SYN flag set on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "NEW TCP w/o SYN" action drop				|| return 1
				;;
				
			icmp-floods|ICMP-FLOODS)
				local mychain="${pre}_${work_name}_icmpflood"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto icmp custom "--icmp-type echo-request"	|| return 1
				
				set_work_function "Generating rules to be protected from ICMP floods on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" limit "${rate}" "${burst}" action return				|| return 1
				rule in chain "${mychain}" loglimit "ICMP FLOOD" action drop					|| return 1
				;;
				
			syn-floods|SYN-FLOODS)
				local mychain="${pre}_${work_name}_synflood"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--syn"		|| return 1
				
				set_work_function "Generating rules to be protected from TCP SYN floods on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" limit "${rate}" "${burst}" action return				|| return 1
				rule in chain "${mychain}" loglimit "SYN FLOOD" action drop					|| return 1
				;;
				
			malformed-xmas|MALFORMED-XMAS)
				local mychain="${pre}_${work_name}_malxmas"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags ALL ALL"	|| return 1
				
				set_work_function "Generating rules to be protected from packets with all TCP flags set on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "MALFORMED XMAS" action drop				|| return 1
				;;
				
			malformed-null|MALFORMED-NULL)
				local mychain="${pre}_${work_name}_malnull"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags ALL NONE" || return 1
				
				set_work_function "Generating rules to be protected from packets with all TCP flags unset on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "MALFORMED NULL" action drop				|| return 1
				;;
				
			malformed-bad|MALFORMED-BAD)
				local mychain="${pre}_${work_name}_malbad"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags SYN,FIN SYN,FIN"			|| return 1
				
				set_work_function "Generating rules to be protected from packets with illegal TCP flags on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags SYN,RST SYN,RST"			|| return 1
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags ALL     SYN,RST,ACK,FIN,URG"	|| return 1
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags ALL     FIN,URG,PSH"		|| return 1
				
				rule in chain "${mychain}" loglimit "MALFORMED BAD" action drop								|| return 1
				;;
				
			*)
				error "Protection '${x}' does not exists."
				return 1
				;;
		esac
	done
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# KERNEL MODULE MANAGEMENT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# Manage kernel modules
# WHY:
# We need to load a set of kernel modules during postprocessing, and after the
# new firewall has been activated. Here we just keep a list of the required
# kernel modules.

# optionaly require command gzcat
require_cmd gzcat

KERNEL_CONFIG=
if [ -f "/proc/config" ]
then
	KERNEL_CONFIG="/proc/config"
	${CAT_CMD} /proc/config >${FIREHOL_DIR}/kcfg
	source ${FIREHOL_DIR}/kcfg
	${RM_CMD} -f ${FIREHOL_DIR}/kcfg	
elif [ -f "/proc/config.gz" -a ! -z "${GZCAT_CMD}" ]
then
	KERNEL_CONFIG="/proc/config.gz"
	${GZCAT_CMD} /proc/config.gz >${FIREHOL_DIR}/kcfg
	source ${FIREHOL_DIR}/kcfg
	${RM_CMD} -f ${FIREHOL_DIR}/kcfg
	
elif [ -f "/lib/modules/`${UNAME_CMD} -r`/build/.config" ]
then
	KERNEL_CONFIG="/lib/modules/`${UNAME_CMD} -r`/build/.config"
	. "${KERNEL_CONFIG}"
	
elif [ -f "/boot/config-`${UNAME_CMD} -r`" ]
then
	KERNEL_CONFIG="/boot/config-`${UNAME_CMD} -r`"
	. "${KERNEL_CONFIG}"
	
elif [ -f "/usr/src/linux/.config" ]
then
	KERNEL_CONFIG="/usr/src/linux/.config"
	. "${KERNEL_CONFIG}"
else
	echo >&2 " "
	echo >&2 " IMPORTANT WARNING:"
	echo >&2 " ------------------"
	echo >&2 " FireHOL cannot find your current kernel configuration."
	echo >&2 " Please, either compile your kernel with /proc/config,"
	echo >&2 " or make sure there is a valid kernel config in:"
	echo >&2 " /usr/src/linux/.config"
	echo >&2 " "
	echo >&2 " Because of this, FireHOL will simply attempt to load"
	echo >&2 " all kernel modules for the services used, without"
	echo >&2 " being able to detect failures."
	echo >&2 " "
fi

# activation-phase command to check for the existance of
# a kernel configuration directive. It returns:
# 0 = module is already in the kernel
# 1 = module can be loaded with modprobe
# 2 = no info about this module in the kernel
check_kernel_config() {
	eval local kcfg="\$${1}"
	
	case ${kcfg} in
		y)	return 0
			;;
		
		m)	return 1
			;;
		
		*)	return 2
			;;
	esac
	
	return 2
}

# activation-phase command to check for the existance of
# a kernel module. It returns:
# 0 = module is already in the kernel
# 1 = module can be loaded with modprobe
# 2 = no info about this module in the kernel
check_kernel_module() {
	local mod="${1}"
	
	case ${mod} in
		ip_tables)
			test -f /proc/net/ip_tables_names && return 0
			check_kernel_config CONFIG_IP_NF_IPTABLES
			return $?
			;;
		
		ip_conntrack)
			test -f /proc/net/ip_conntrack && return 0
			check_kernel_config CONFIG_IP_NF_CONNTRACK
			return $?
			;;
			
		ip_conntrack_*)
			local mnam="CONFIG_IP_NF_`echo ${mod} | ${CUT_CMD} -d '_' -f 3- | ${TR_CMD} a-z A-Z`"
			check_kernel_config ${mnam}
			return $?
			;;
			
		ip_nat_*)
			local mnam="CONFIG_IP_NF_NAT_`echo ${mod} | ${CUT_CMD} -d '_' -f 3- | ${TR_CMD} a-z A-Z`"
			check_kernel_config ${mnam}
			return $?
			;;
			
		*)
			return 2
			;;
	esac
	
	return 2
}

# activation-phase command to load a kernel module.
load_kernel_module() {
	local mod="${1}"
	
	if [ ! ${FIREHOL_LOAD_KERNEL_MODULES} -eq 0 ]
	then
		check_kernel_module ${mod}
		if [ $? -gt 0 ]
		then
			runcmd warn ${FIREHOL_LINEID} ${MODPROBE_CMD} ${mod} -q
		fi
	fi
	return 0
}

# Processing-phase command to tell FireHOL to find one or more
# kernel modules to load, during activation-phase.
require_kernel_module() {
	local new="${1}"
	
	local m=
	for m in ${FIREHOL_KERNEL_MODULES}
	do
		test "${m}" = "${new}" && return 0
	done
	
	FIREHOL_KERNEL_MODULES="${FIREHOL_KERNEL_MODULES} ${new}"
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - FireHOL internals
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


set_work_function() {
	local show_explain=1
	test "$1" = "-ne" && shift && local show_explain=0
	
	work_function="$*"
	
	if [ ${FIREHOL_EXPLAIN} -eq 1 ]
	then
		test ${show_explain} -eq 1 && printf "\n# %s\n" "$*"
	elif [ ${FIREHOL_CONF_SHOW} -eq 1 ]
	then
		test ${show_explain} -eq 1 && printf "\n# INFO>>> %s\n" "$*" >>${FIREHOL_OUTPUT}
	fi
}


# ------------------------------------------------------------------------------
# Check the status of the current primary command.
# WHY:
# Some sanity check for the order of commands in the configuration file.
# Each function has a "require_work type command" in order to check that it is
# placed in a valid point. This means that if you place a "route" command in an
# interface section (and many other combinations) it will fail.

require_work() {
	local type="${1}"
	local cmd="${2}"
	
	case "${type}" in
		clear)
			test ! -z "${work_cmd}" && error "Previous work was not applied." && return 1
			;;
		
		set)
			test -z "${work_cmd}" && error "The command used requires that a primary command is set." && return 1
			test ! "${work_cmd}" = "${cmd}" -a ! "${cmd}" = "any"  && error "Primary command is '${work_cmd}' but '${cmd}' is required." && return 1
			;;
			
		*)
			error "Unknown work status '${type}'."
			return 1
			;;
	esac
	
	return 0
}


# ------------------------------------------------------------------------------
# Finalizes the rules of the last primary command.
# WHY:
# At the end of an interface or router we need to add some code to apply its
# policy, accept all related packets, etc.
# Finalization occures automatically when a new primary command is executed and
# when the configuration file finishes.

close_cmd() {
	set_work_function -ne "Closing last open primary command (${work_cmd}/${work_name})"
	
	case "${work_cmd}" in
		interface)
			close_interface || return 1
			;;
		
		router)
			close_router || return 1
			;;
		
		'')
			;;
		
		*)
			error "Unknown work '${work_cmd}'."
			return 1
			;;
	esac
	
	# Reset the current status variables to empty/default
	work_counter=0
	work_cmd=
	work_realcmd=("(unset)")
	work_name=
	work_inface=
	work_outface=
	work_policy="${DEFAULT_INTERFACE_POLICY}"
	
	return 0
}

# ------------------------------------------------------------------------------
# close_interface
# WHY:
# Finalizes the rules for the last interface().

close_interface() {
	require_work set interface || return 1
	
	close_all_groups
	
	set_work_function "Finilizing interface '${work_name}'"
	
	case "${work_policy}" in
		return|RETURN)
			return 0
			;;
			
		accept|ACCEPT)
			;;
		
		*)
			local -a inlog=(loglimit "'IN-${work_name}'")
			local -a outlog=(loglimit "'OUT-${work_name}'")
			;;
	esac
	
	# Accept all related traffic to the established connections
	rule chain "in_${work_name}" state RELATED action ACCEPT || return 1
	rule chain "out_${work_name}" state RELATED action ACCEPT || return 1
	
	rule chain "in_${work_name}" "${inlog[@]}" action ${work_policy} || return 1
	rule reverse chain "out_${work_name}" "${outlog[@]}" action ${work_policy} || return 1
	
	return 0
}


# ------------------------------------------------------------------------------
# close_router
# WHY:
# Finalizes the rules for the last router().

close_router() {	
	require_work set router || return 1
	
	close_all_groups
	
	set_work_function "Finilizing router '${work_name}'"
	
	# Accept all related traffic to the established connections
	rule chain "in_${work_name}" state RELATED action ACCEPT || return 1
	rule chain "out_${work_name}" state RELATED action ACCEPT || return 1
	
	return 0
}


# ------------------------------------------------------------------------------
# close_master
# WHY:
# Finalizes the rules for the whole firewall.
# It assummes there is not primary command open.

close_master() {
	set_work_function "Finilizing firewall policies"
	
	# Accept all related traffic to the established connections
	rule chain INPUT state RELATED action ACCEPT || return 1
	rule chain OUTPUT state RELATED action ACCEPT || return 1
	rule chain FORWARD state RELATED action ACCEPT || return 1
	
	rule chain INPUT loglimit "IN-unknown" action ${UNMATCHED_INPUT_POLICY} || return 1
	rule chain OUTPUT loglimit "OUT-unknown" action ${UNMATCHED_OUTPUT_POLICY} || return 1
	rule chain FORWARD loglimit "PASS-unknown" action ${UNMATCHED_ROUTER_POLICY} || return 1
	return 0
}


FIREHOL_GROUP_COUNTER=0
FIREHOL_GROUP_DEPTH=0
FIREHOL_GROUP_STACK=()
group() {
        work_realcmd_primary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	
	local type="${1}"; shift
	
	case $type in
		with|start|begin)
			# increase the counter
			FIREHOL_GROUP_COUNTER=$[FIREHOL_GROUP_COUNTER + 1]
			
			set_work_function "Starting new group No ${FIREHOL_GROUP_COUNTER}, under '${work_name}'"
			
			# put the current name in the stack
			FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]=${work_name}
			FIREHOL_GROUP_DEPTH=$[FIREHOL_GROUP_DEPTH + 1]
			
			# name for the new chain
			mychain="group${FIREHOL_GROUP_COUNTER}"
			
			# create the new chain
			create_chain filter "in_${mychain}" "in_${work_name}" in "$@" || return 1
			create_chain filter "out_${mychain}" "out_${work_name}" out reverse "$@" || return 1
			
			# set a new name for new rules
			work_name=${mychain}
			;;
		
		end|stop|close)
			if [ ${FIREHOL_GROUP_DEPTH} -eq 0 ]
			then
				error "There is no group open to close."
				return 1
			fi
			
			# pop one name from the stack
			FIREHOL_GROUP_DEPTH=$[FIREHOL_GROUP_DEPTH - 1]
			
			set_work_function "Closing group '${work_name}'. Now working under '${FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]}'"
			
			work_name=${FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]}
			;;
		
		*)
			error "Statement 'group' requires the first argument to be one of with, start, begin, end, stop, close."
			return 1
			;;
	esac
	
	return 0
}

close_all_groups() {
	while [ ${FIREHOL_GROUP_DEPTH} -gt 0 ]
	do
		group close || return 1
	done
	
	return 0
}



# ------------------------------------------------------------------------------
# rule - the heart of FireHOL - iptables commands generation
# WHY:
# This is the function that gives all the magic to FireHOL. Actually it is a
# wrapper for iptables, producing multiple iptables commands based on its
# arguments. The rest of FireHOL is simply a "driver" for this function.


# rule_action_param() is a function - part of rule() - to create the final iptables cmd
# taking into account the "action_param" parameter of the action.

# rule_action_param() should only be used within rule() - no other place

FIREHOL_ACCEPT_CHAIN_COUNT=0
rule_action_param() {
	local action="${1}"; shift
	local protocol="${1}"; shift
	local statenot="${1}"; shift
	local state="${1}"; shift
	local table="${1}"; shift
	local -a action_param=()
	
	# All arguments until the separator are the parameters of the action
	local count=0
	while [ ! -z "${1}" -a ! "A${1}" = "A--" ]
	do
		action_param[$count]="${1}"
		shift
		
		count=$[count + 1]
	done
	
	# If we don't have a seperator, generate an error
	local sep="${1}"; shift
	if [ ! "A${sep}" = "A--" ]
	then
		error "Internal Error, in parsing action_param parameters ($FUNCNAME '${action}' '${protocol}' '${statenot}' '${state}' '${table}' '${action_param[@]}' ${sep} '$@')."
		return 1
	fi
	
	# Do the rule
	case "${action}" in
		NONE)
			return 0
			;;
			
		ACCEPT)
			# do we have any options for this accept?
			if [ ! -z "${action_param[0]}" ]
			then
				# find the options we have
				case "${action_param[0]}" in
					"limit")
						# limit NEW connections to the specified rate
						local freq="${action_param[1]}"
						local burst="${action_param[2]}"
						local overflow="REJECT"
						
						# if we have a custom overflow action, parse it.
						test "${action_param[3]}" = "overflow" && local overflow="`echo "${action_param[4]}" | tr "a-z" "A-Z"`"
						
						# unset the action_param, so that if this rule does not include NEW connections,
						# we will not append anything to the generated iptables statements.
						local -a action_param=()
						
						# find is this rule matches NEW connections
						local has_new=`echo "${state}" | grep -i NEW`
						local do_accept_limit=0
						if [ -z "${statenot}" ]
						then
							test ! -z "${has_new}" && local do_accept_limit=1
						else
							test -z "${has_new}" && local do_accept_limit=1
						fi
						
						# we have a match for NEW connections.
						# redirect the traffic to a new chain, which will control
						# the NEW connections while allowing all the other traffic
						# to pass.
						if [ "${do_accept_limit}" = "1" ]
						then
							local accept_limit_chain="`echo "ACCEPT ${freq} ${burst} ${overflow}" | tr " /." "___"`"
							
							# does the chain we need already exist?
							if [ ! -f "${FIREHOL_CHAINS_DIR}/${accept_limit_chain}" ]
							then
								# the chain does not exist. create it.
								iptables ${table} -N "${accept_limit_chain}"
								touch "${FIREHOL_CHAINS_DIR}/${accept_limit_chain}"
								
								# first, if the traffic is not a NEW connection, allow it.
								# doing this first will speed up normal traffic.
								iptables ${table} -A "${accept_limit_chain}" -m state ! --state NEW -j ACCEPT
								
								# accept NEW connections within the given limits.
								iptables ${table} -A "${accept_limit_chain}" -m limit --limit "${freq}" --limit-burst "${burst}" -j ACCEPT
								
								# log the overflow NEW connections reaching this step within the new chain
								local -a logopts_arg=()
								if [ "${FIREHOL_LOG_MODE}" = "ULOG" ]
								then
									local -a logopts_arg=("--ulog-prefix='OVERFLOW:'")
								else
									local -a logopts_arg=("--log-level" "${FIREHOL_LOG_LEVEL}" "--log-prefix='OVERFLOW:'")
								fi
								iptables ${table} -A "${accept_limit_chain}" -m limit --limit "${FIREHOL_LOG_FREQUENCY}" --limit-burst "${FIREHOL_LOG_BURST}" -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
								
								# if the overflow is to be rejected is tcp, reject it with TCP-RESET
								if [ "${overflow}" = "REJECT" ]
								then
									iptables ${table} -A "${accept_limit_chain}" -p tcp -j REJECT --reject-with tcp-reset
								fi
								
								# do the specified action on the overflow
								iptables ${table} -A "${accept_limit_chain}" -j ${overflow}
							fi
							
							# send the rule to be generated to this chain
							local action=${accept_limit_chain}
						fi
						;;
						
					'knock')
						# the name of the knock
						local name="knock_${action_param[1]}"
						
						# unset the action_param, so that if this rule does not include NEW connections,
						# we will not append anything to the generated iptables statements.
						local -a action_param=()
						
						# does the knock chain exists?
						if [ ! -f "${FIREHOL_CHAINS_DIR}/${name}" ]
						then
							# the chain does not exist. create it.
							iptables ${table} -N "${name}"
							touch "${FIREHOL_CHAINS_DIR}/${name}"
							
							iptables -A "${name}" -m state --state ESTABLISHED -j ACCEPT
							
							# knockd (http://www.zeroflux.org/knock/)
							# will create more rules inside this chain to match NEW packets.
						fi
						
						# send the rule to be generated to this knock chain
						local action=${name}
						;;
						
					*)
						error "Internal error. Cannot understand action ${action} with parameter '${action_param[0]}'."
						return 1
						;;
				esac
			fi
			;;
			
		REJECT)
			if [ "${action_param[1]}" = "auto" ]
			then
				if [ "${protocol}" = "tcp" -o "${protocol}" = "TCP" ]
				then
					action_param=("--reject-with" "tcp-reset")
				else
					action_param=()
				fi
			fi
			;;
	esac
	
	iptables "$@" -j "${action}" "${action_param[@]}"
	local ret=$?
	
	test $ret -gt 0 && failed=$[failed + 1]
	
	return $ret
}

rule() {
	local table=
	local chain=
	
	local inface=any
	local infacenot=
	
	local outface=any
	local outfacenot=
	
	local physin=any
	local physinnot=
	
	local physout=any
	local physoutnot=
	
	local mac=any
	local macnot=
	
	local src=any
	local srcnot=
	
	local dst=any
	local dstnot=
	
	local sport=any
	local sportnot=
	
	local dport=any
	local dportnot=
	
	local proto=any
	local protonot=
	
	local uid=any
	local uidnot=
	
	local gid=any
	local gidnot=
	
	local pid=any
	local pidnot=
	
	local sid=any
	local sidnot=
	
	local cmd=any
	local cmdnot=
	
	local mark=any
	local marknot=
	
	local dscp=any
	local dscptype=
	local despnot=
	
	local tos=any
	local tosnot=
	
	local log=
	local logtxt=
	local loglevel=
	
	local limit=
	local burst=
	
	local iplimit=
	local iplimit_mask=
	
	local action=
	
	local state=
	local statenot=
	
	local failed=0
	local reverse=0
	
	local swi=0
	local swo=0
	
	local custom=
	
	# if set to 1, all owner module options will be ignored
	local noowner=0
	
	# if set to 1, all mac options will be ignored
	local nomac=0
	
	# if set to 1, MIRROR will be converted to REJECT
	local nomirror=0
	
	# if set to 1, log and loglimit are ignored.
	local nolog=0
	
	# if set to 1, detection algorithm about overwritting optional rule
	# parameters will take place.
	local softwarnings=1
	
	# set it, in order to be local
	local -a action_param=()
	
	while [ ! -z "${1}" ]
	do
		case "${1}" in
			reverse|REVERSE)
				reverse=1
				shift
				;;
				
			table|TABLE)
				test ${softwarnings} -eq 1 -a ! -z "${table}" && softwarning "Overwritting param: ${1} '${chain}' becomes '${2}'"
				table="-t ${2}"
				shift 2
				;;
				
			chain|CHAIN)
				test ${softwarnings} -eq 1 -a ! -z "${chain}" && softwarning "Overwritting param: ${1} '${chain}' becomes '${2}'"
				chain="${2}"
				shift 2
				;;
				
			inface|INFACE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					infacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						infacenot="!"
					else
						if [ $swi -eq 1 ]
						then
							work_inface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${inface}" = "any" && softwarning "Overwritting param: inface '${inface}' becomes '${1}'"
					inface="${1}"
				else
					outfacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						outfacenot="!"
					else
						if [ ${swo} -eq 1 ]
						then
							work_outface="$1"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${outface}" = "any" && softwarning "Overwritting param: outface '${outface}' becomes '${1}'"
					outface="${1}"
				fi
				shift
				;;
				
			outface|OUTFACE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					outfacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						outfacenot="!"
					else
						if [ ${swo} -eq 1 ]
						then
							work_outface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${outface}" = "any" && softwarning "Overwritting param: outface '${outface}' becomes '${1}'"
					outface="${1}"
				else
					infacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						infacenot="!"
					else
						if [ ${swi} -eq 1 ]
						then
							work_inface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${inface}" = "any" && softwarning "Overwritting param: inface '${inface}' becomes '${1}'"
					inface="${1}"
				fi
				shift
				;;
				
			physin|PHYSIN)
				shift
				if [ ${reverse} -eq 0 ]
				then
					physinnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						physinnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physin}" = "any" && softwarning "Overwritting param: physin '${physin}' becomes '${1}'"
					physin="${1}"
				else
					physoutnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						physoutnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physout}" = "any" && softwarning "Overwritting param: physout '${physout}' becomes '${1}'"
					physout="${1}"
				fi
				shift
				;;
				
			physout|PHYSOUT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					physoutnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						physoutnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physout}" = "any" && softwarning "Overwritting param: physout '${physout}' becomes '${1}'"
					physout="${1}"
				else
					physinnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						physinnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physin}" = "any" && softwarning "Overwritting param: physin '${physin}' becomes '${1}'"
					physin="${1}"
				fi
				shift
				;;
				
			mac|MAC)
				shift
				macnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					macnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${mac}" = "any" && softwarning "Overwritting param: mac '${mac}' becomes '${1}'"
				test ${nomac} -eq 0 && mac="${1}"
				shift
				;;
				
			src|SRC|source|SOURCE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					srcnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						srcnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${src}" = "any" && softwarning "Overwritting param: src '${src}' becomes '${1}'"
					src="${1}"
				else
					dstnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						dstnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dst}" = "any" && softwarning "Overwritting param: dst '${dst}' becomes '${1}'"
					dst="${1}"
				fi
				shift
				;;
				
			dst|DST|destination|DESTINATION)
				shift
				if [ ${reverse} -eq 0 ]
				then
					dstnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						dstnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dst}" = "any" && softwarning "Overwritting param: dst '${dst}' becomes '${1}'"
					dst="${1}"
				else
					srcnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						srcnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${src}" = "any" && softwarning "Overwritting param: src '${src}' becomes '${1}'"
					src="${1}"
				fi
				shift
				;;
				
			sport|SPORT|sourceport|SOURCEPORT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					sportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						sportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${sport}" = "any" && softwarning "Overwritting param: sport '${sport}' becomes '${1}'"
					sport="${1}"
				else
					dportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						dportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dport}" = "any" && softwarning "Overwritting param: dport '${dport}' becomes '${1}'"
					dport="${1}"
				fi
				shift
				;;
				
			dport|DPORT|destinationport|DESTINATIONPORT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					dportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						dportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dport}" = "any" && softwarning "Overwritting param: dport '${dport}' becomes '${1}'"
					dport="${1}"
				else
					sportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						sportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${sport}" = "any" && softwarning "Overwritting param: sport '${sport}' becomes '${1}'"
					sport="${1}"
				fi
				shift
				;;
				
			proto|PROTO|protocol|PROTOCOL)
				shift
				protonot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					protonot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${proto}" = "any" && softwarning "Overwritting param: proto '${proto}' becomes '${1}'"
				proto="${1}"
				shift
				;;
				
			mark|MARK)
				shift
				marknot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					marknot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${mark}" = "any" && softwarning "Overwritting param: mark '${mark}' becomes '${1}'"
				mark="${1}"
				shift
				;;
				
			tos|TOS)
				shift
				tosnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					tosnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${tos}" = "any" && softwarning "Overwritting param: tos '${tos}' becomes '${1}'"
				tos="${1}"
				shift
				;;
				
			dscp|DSCP)
				shift
				dscpnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					dscpnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${dscp}" = "any" && softwarning "Overwritting param: dscp '${dscp}' becomes '${1}'"
				dscp="${1}"
				shift
				
				if [ "${dscp}" = "class" ]
				then
					dscptype="-class"
					dscp="${1}"
					shift
				fi
				;;
				
			action|ACTION)
				test ${softwarnings} -eq 1 -a ! -z "${action}" && softwarning "Overwritting param: action '${action}' becomes '${2}'"
				action="${2}"
				shift 2
				
				local -a action_param=()
				local action_is_chain=0
				case "${action}" in
					accept|ACCEPT)
						action="ACCEPT"
						
						if [ "${1}" = "with" ]
						then
							shift
							
							case "${1}" in
								limit|LIMIT)
									local -a action_param=("limit" "${2}" "${3}")
									shift 3
									
									if [ "${1}" = "overflow" ]
									then
										action_param[3]="overflow"
										action_param[4]="${2}"
										shift 2
									fi
									;;
								
								knock|KNOCK)
									local -a action_param=("knock" "${2}")
									shift 2
									;;
								
								*)
									error "Cannot understand action's '${action}' directive '${1}'"
									return 1
									;;
							esac
						fi
						;;
						
					deny|DENY|drop|DROP)
						action="DROP"
						;;
						
					reject|REJECT)
						action="REJECT"
						if [ "${1}" = "with" ]
						then
							local -a action_param=("--reject-with" "${2}")
							shift 2
						else
							local -a action_param=("--reject-with" "auto")
						fi
						;;
						
					return|RETURN)
						action="RETURN"
						;;
						
					mirror|MIRROR)
						action="MIRROR"
						test $nomirror -eq 1 && action="REJECT"
						;;
						
					none|NONE)
						action="NONE"
						;;
						
					snat|SNAT)
						action="SNAT"
						if [ "${1}" = "to" ]
						then
							local -a action_param=()
							local x=
							for x in ${2}
							do
								action_param=(${action_param[@]} "--to-source" "${x}")
							done
							shift 2
						else
							error "${action} requires a 'to' argument."
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					dnat|DNAT)
						action="DNAT"
						if [ "${1}" = "to" ]
						then
							local -a action_param=()
							local x=
							for x in ${2}
							do
								action_param=(${action_param[@]} "--to-destination" "${x}")
							done
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					redirect|REDIRECT)
						action="REDIRECT"
						if [ "${1}" = "to-port" -o "${1}" = "to" ]
						then
							local -a action_param=("--to-ports" "${2}")
							shift 2
						else
							error "${action} requires a 'to-port' or 'to' argument."
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					tos|TOS)
						action="TOS"
						if [ "${1}" = "to" ]
						then
							local -a action_param=("--set-tos" "${2}")
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					mark|MARK)
						action="MARK"
						if [ "${1}" = "to" ]
						then
							local -a action_param=("--set-mark" "${2}")
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					dscp|DSCP)
						action="DSCP"
						if [ "${1}" = "to" ]
						then
							if [ "${2}" = "class" ]
							then
								local -a action_param=("--set-dscp-class" "${2}")
								shift
							else
								local -a action_param=("--set-dscp" "${2}")
							fi
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					*)
						chain_exists "${action}"
						local action_is_chain=$?
						;;
				esac
				;;
			
			state|STATE)
				shift
				statenot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					statenot="!"
				fi
				test ${softwarnings} -eq 1 -a ! -z "${state}" && softwarning "Overwritting param: state '${state}' becomes '${1}'"
				state="${1}"
				shift
				;;
				
			user|USER|uid|UID)
				shift
				uidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && uidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${uid}" = "any" && softwarning "Overwritting param: uid '${uid}' becomes '${1}'"
				test ${noowner} -eq 0 && uid="${1}"
				shift
				;;
				
			group|GROUP|gid|GID)
				shift
				gidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && gidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${gid}" = "any" && softwarning "Overwritting param: gid '${gid}' becomes '${1}'"
				test ${noowner} -eq 0 && gid="${1}"
				shift
				;;
				
			process|PROCESS|pid|PID)
				shift
				pidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && pidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${pid}" = "any" && softwarning "Overwritting param: pid '${pid}' becomes '${1}'"
				test ${noowner} -eq 0 && pid="${1}"
				shift
				;;
				
			session|SESSION|sid|SID)
				shift
				sidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && sidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${sid}" = "any" && softwarning "Overwritting param: sid '${sid}' becomes '${1}'"
				test ${noowner} -eq 0 && sid="${1}"
				shift
				;;
				
			command|COMMAND|cmd|CMD)
				shift
				cmdnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && cmdnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${cmd}" = "any" && softwarning "Overwritting param: cmd '${cmd}' becomes '${1}'"
				test ${noowner} -eq 0 && cmd="${1}"
				shift
				;;
				
			custom|CUSTOM)
				test ${softwarnings} -eq 1 -a ! -z "${custom}" && softwarning "Overwritting param: custom '${custom}' becomes '${2}'"
				custom="${2}"
				shift 2
				;;
				
			log|LOG)
				if [ ${nolog} -eq 0 ]
				then
					test ${softwarnings} -eq 1 -a ! -z "${log}" && softwarning "Overwritting param: log '${log}/${logtxt}' becomes 'normal/${2}'"
					log=normal
					logtxt="${2}"
				fi
				shift 2
				if [ "${1}" = "level" ]
				then
					loglevel="${2}"
					shift 2
				else
					loglevel="${FIREHOL_LOG_LEVEL}"
				fi
				;;
				
			loglimit|LOGLIMIT)
				if [ ${nolog} -eq 0 ]
				then
					test ${softwarnings} -eq 1 -a ! -z "${log}" && softwarning "Overwritting param: log '${log}/${logtxt}' becomes 'limit/${2}'"
					log=limit
					logtxt="${2}"
				fi
				shift 2
				if [ "${1}" = "level" ]
				then
					loglevel="${2}"
					shift 2
				else
					loglevel="${FIREHOL_LOG_LEVEL}"
				fi
				;;
				
			limit|LIMIT)
				test ${softwarnings} -eq 1 -a ! -z "${limit}" && softwarning "Overwritting param: limit '${limit}' becomes '${2}'"
				limit="${2}"
				burst="${3}"
				shift 3
				;;
				
			iplimit|IPLIMIT)
				test ${softwarnings} -eq 1 -a ! -z "${iplimit}" && softwarning "Overwritting param: iplimit '${iplimit}' becomes '${2}'"
				iplimit="${2}"
				iplimit_mask="${3}"
				shift 3
				;;
				
			in)	# this is incoming traffic - ignore packet ownership
				local noowner=1
				local nomirror=0
				local nomac=0
				shift
				;;
				
			out)	# this is outgoing traffic - ignore packet ownership if not in an interface
				if [ ! "${work_cmd}" = "interface" ]
				then
					local noowner=1
				else
					local nomirror=1
				fi
				local nomac=1
				shift
				;;
				
			nolog)
				local nolog=1
				shift
				;;
				
			noowner)
				local noowner=1
				shift
				;;
				
			softwarnings)
				local softwarnings=1
				shift
				;;
				
			nosoftwarnings)
				local softwarnings=0
				shift
				;;
				
			set_work_inface|SET_WORK_INFACE)
				swi=1
				shift
				;;
				
			set_work_outface|SET_WORK_OUTFACE)
				swo=1
				shift
				;;
				
			*)
				error "Cannot understand directive '${1}'."
				return 1
				;;
		esac
	done
	
	test -z "${table}" && table="-t filter"
	
	# If the user did not specified a rejection message,
	# we have to be smart and produce a tcp-reset if the protocol
	# is TCP and an ICMP port unreachable in all other cases.
	# The special case here is the protocol "any".
	# To accomplish the differentiation based on protocol we have
	# to change the protocol "any" to "tcp any"
	
	test "${action}" = "REJECT" -a "${action_param[1]}" = "auto" -a "${proto}" = "any" && proto="tcp any"
	
	
	# we cannot accept empty strings to a few parameters, since this
	# will prevent us from generating a rule (due to nested BASH loops).
	test -z "${inface}"	&& error "Cannot accept an empty 'inface'."	&& return 1
	test -z "${outface}"	&& error "Cannot accept an empty 'outface'."	&& return 1
	test -z "${physin}"	&& error "Cannot accept an empty 'physin'."	&& return 1
	test -z "${physout}"	&& error "Cannot accept an empty 'physout'."	&& return 1
	test -z "${mac}"	&& error "Cannot accept an empty 'mac'."	&& return 1
	test -z "${src}"	&& error "Cannot accept an empty 'src'."	&& return 1
	test -z "${dst}"	&& error "Cannot accept an empty 'dst'."	&& return 1
	test -z "${sport}"	&& error "Cannot accept an empty 'sport'."	&& return 1
	test -z "${dport}"	&& error "Cannot accept an empty 'dport'."	&& return 1
	test -z "${proto}"	&& error "Cannot accept an empty 'proto'."	&& return 1
	test -z "${uid}"	&& error "Cannot accept an empty 'uid'."	&& return 1
	test -z "${gid}"	&& error "Cannot accept an empty 'gid'."	&& return 1
	test -z "${pid}"	&& error "Cannot accept an empty 'pid'."	&& return 1
	test -z "${sid}"	&& error "Cannot accept an empty 'sid'."	&& return 1
	test -z "${cmd}"	&& error "Cannot accept an empty 'cmd'."	&& return 1
	
	
	# ----------------------------------------------------------------------------------
	# Do we have negative contitions?
	# If yes, we have to:
	#
	# case 1: If the action is a chain.
	#         Add to this chain positive RETURN statements matching all the negatives.
	#         The positive rules will be added bellow to the same chain and will be
	#         matched only if all RETURNs have not been matched.
	#
	# case 2: If the action is not a chain.
	#         Create a temporary chain, then add to this chain positive RETURN rules
	#         matching the negatives, and append at its end the final action (which is
	#         not a chain), then change the action of the positive rules to jump to
	#         this temporary chain.
	
	
	# ignore 'statenot' since it is negated in the positive rules
	if [ ! -z "${infacenot}${outfacenot}${physinnot}${physoutnot}${macnot}${srcnot}${dstnot}${sportnot}${dportnot}${protonot}${uidnot}${gidnot}${pidnot}${sidnot}${cmdnot}${marknot}${tosnot}${dscpnot}" ]
	then
		if [ ${action_is_chain} -eq 1 ]
		then
			# if the action is a chain name, then just add the negative
			# expressions to this chain. Nothing more.
			
			local negative_chain="${action}"
			local negative_action=
		else
			# if the action is a native iptables action, then create
			# an intermidiate chain to store the negative expression,
			# and change the action of the rule to point to this action.
			
			# In this case, bellow we add after all negatives, the original
			# action of the rule.
			
			local negative_chain="${chain}.${FIREHOL_DYNAMIC_CHAIN_COUNTER}"
			FIREHOL_DYNAMIC_CHAIN_COUNTER="$[FIREHOL_DYNAMIC_CHAIN_COUNTER + 1]"
			
			iptables ${table} -N "${negative_chain}"
			local negative_action="${action}"
			local action="${negative_chain}"
		fi
		
		
		if [ ! -z "${infacenot}" ]
		then
			local inf=
			for inf in ${inface}
			do
				iptables ${table} -A "${negative_chain}" -i "${inf}" -j RETURN
			done
			infacenot=
			inface=any
		fi
	
		if [ ! -z "${outfacenot}" ]
		then
			local outf=
			for outf in ${outface}
			do
				iptables ${table} -A "${negative_chain}" -o "${outf}" -j RETURN
			done
			outfacenot=
			outface=any
		fi
		
		if [ ! -z "${physinnot}" ]
		then
			local inph=
			for inph in ${physin}
			do
				iptables ${table} -A "${negative_chain}" -m physdev --physdev-in "${inph}" -j RETURN
			done
			physinnot=
			physin=any
		fi
	
		if [ ! -z "${physoutnot}" ]
		then
			local outph=
			for outph in ${physout}
			do
				iptables ${table} -A "${negative_chain}" -m physdev --physdev-out "${outph}" -j RETURN
			done
			physoutnot=
			physout=any
		fi
		
		if [ ! -z "${macnot}" ]
		then
			local m=
			for m in ${mac}
			do
				iptables ${table} -A "${negative_chain}" -m mac --mac-source "${m}" -j RETURN
			done
			macnot=
			mac=any
		fi
		
		if [ ! -z "${srcnot}" ]
		then
			local s=
			for s in ${src}
			do
				iptables ${table} -A "${negative_chain}" -s "${s}" -j RETURN
			done
			srcnot=
			src=any
		fi
		
		if [ ! -z "${dstnot}" ]
		then
			local d=
			for d in ${dst}
			do
				iptables ${table} -A "${negative_chain}" -d "${d}" -j RETURN
			done
			dstnot=
			dst=any
		fi
		
		if [ ! -z "${protonot}" ]
		then
			if [ ! -z "${sportnot}" -o ! -z "${dportnot}" ]
			then
				error "Cannot have negative protocol(s) and source/destination port(s)."
				return 1
			fi
			
			local pr=
			for pr in ${proto}
			do
				iptables ${table} -A "${negative_chain}" -p "${pr}" -j RETURN
			done
			protonot=
			proto=any
		fi
		
		if [ ! -z "${sportnot}" ]
		then
			if [ "${proto}" = "any" ]
			then
				error "Cannot have negative source port specification without protocol."
				return 1
			fi
			
			local sp=
			for sp in ${sport}
			do
				local pr=
				for pr in ${proto}
				do
					iptables ${table} -A "${negative_chain}" -p "${pr}" --sport "${sp}" -j RETURN
				done
			done
			sportnot=
			sport=any
		fi
		
		if [ ! -z "${dportnot}" ]
		then
			if [ "${proto}" = "any" ]
			then
				error "Cannot have negative destination port specification without protocol."
				return 1
			fi
			
			local dp=
			for dp in ${dport}
			do
				local pr=
				for pr in ${proto}
				do
					iptables ${table} -A "${negative_chain}" -p "${pr}" --dport "${dp}" -j RETURN
				done
			done
			dportnot=
			dport=any
		fi
		
		if [ ! -z "${uidnot}" ]
		then
			local tuid=
			for tuid in ${uid}
			do
				iptables ${table} -A "${negative_chain}" -m owner --uid-owner "${tuid}" -j RETURN
			done
			uidnot=
			uid=any
		fi
		
		if [ ! -z "${gidnot}" ]
		then
			local tgid=
			for tgid in ${gid}
			do
				iptables ${table} -A "${negative_chain}" -m owner --gid-owner "${tgid}" -j RETURN
			done
			gidnot=
			gid=any
		fi
		
		if [ ! -z "${pidnot}" ]
		then
			local tpid=
			for tpid in ${pid}
			do
				iptables ${table} -A "${negative_chain}" -m owner --pid-owner "${tpid}" -j RETURN
			done
			pidnot=
			pid=any
		fi
		
		if [ ! -z "${sidnot}" ]
		then
			local tsid=
			for tsid in ${sid}
			do
				iptables ${table} -A "${negative_chain}" -m owner --sid-owner "${tsid}" -j RETURN
			done
			sidnot=
			sid=any
		fi
		
		if [ ! -z "${cmdnot}" ]
		then
			local tcmd=
			for tcmd in ${cmd}
			do
				iptables ${table} -A "${negative_chain}" -m owner --cmd-owner "${tcmd}" -j RETURN
			done
			cmdnot=
			cmd=any
		fi
		
		if [ ! -z "${marknot}" ]
		then
			local tmark=
			for tmark in ${mark}
			do
				iptables ${table} -A "${negative_chain}" -m mark --mark "${tmark}" -j RETURN
			done
			marknot=
			mark=any
		fi
		
		if [ ! -z "${tosnot}" ]
		then
			local ttos=
			for ttos in ${tos}
			do
				iptables ${table} -A "${negative_chain}" -m tos --tos "${ttos}" -j RETURN
			done
			tosnot=
			tos=any
		fi
		
		if [ ! -z "${dscpnot}" ]
		then
			local tdscp=
			for tdscp in ${dscp}
			do
				iptables ${table} -A "${negative_chain}" -m dscp --dscp${dscptype} "${tdscp}" -j RETURN
			done
			dscp=any
			dscpnot=
		fi
		
		
		# in case this is temporary chain we created for the negative expression,
		# just make it have the final action of the rule.
		if [ ! -z "${negative_action}" ]
		then
			local pr=
			for pr in ${proto}
			do
				local -a proto_arg=()
				
				case ${pr} in
					any|ANY)
						;;
					
					*)
						local -a proto_arg=("-p" "${pr}")
						;;
				esac
				
				rule_action_param "${negative_action}" "${pr}" "" "" "${table}" "${action_param[@]}" -- ${table} -A "${negative_chain}" "${proto_arg[@]}"
				local -a action_param=()
			done
		fi
	fi
	
	
	# ----------------------------------------------------------------------------------
	# Process the positive rules
	
	# uid
	local tuid=
	for tuid in ${uid}
	do
		local -a uid_arg=()
		local -a owner_arg=()
		
		case ${tuid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a uid_arg=("--uid-owner" "${tuid}")
				;;
		esac
	
	# gid
	local tgid=
	for tgid in ${gid}
	do
		local -a gid_arg=()
		
		case ${tgid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a gid_arg=("--gid-owner" "${tgid}")
				;;
		esac
	
	# pid
	local tpid=
	for tpid in ${pid}
	do
		local -a pid_arg=()
		
		case ${tpid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a pid_arg=("--pid-owner" "${tpid}")
				;;
		esac
	
	# sid
	local tsid=
	for tsid in ${sid}
	do
		local -a sid_arg=()
		
		case ${tsid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a sid_arg=("--sid-owner" "${tsid}")
				;;
		esac
	
	# cmd
	local tcmd=
	for tcmd in ${cmd}
	do
		local -a cmd_arg=()
		
		case ${tcmd} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a cmd_arg=("--cmd-owner" "${tcmd}")
				;;
		esac
	
	# mark
	local tmark=
	for tmark in ${mark}
	do
		local -a mark_arg=()
		
		case ${tmark} in
			any|ANY)
				;;
			
			*)
				local -a mark_arg=("-m" "mark" "--mark" "${tmark}")
				;;
		esac
	
	# tos
	local ttos=
	for ttos in ${tos}
	do
		local -a tos_arg=()
		
		case ${ttos} in
			any|ANY)
				;;
			
			*)
				local -a tos_arg=("-m" "tos" "--tos" "${ttos}")
				;;
		esac
	
	# dscp
	local tdscp=
	for tdscp in ${dscp}
	do
		local -a dscp_arg=()
		
		case ${tdscp} in
			any|ANY)
				;;
			
			*)
				local -a dscp_arg=("-m" "dscp" "--dscp${dscptype}" "${tdscp}")
				;;
		esac
	
	# proto
	local pr=
	for pr in ${proto}
	do
		local -a proto_arg=()
		
		case ${pr} in
			any|ANY)
				;;
			
			*)
				local -a proto_arg=("-p" "${pr}")
				;;
		esac
	
	# inface
	local inf=
	for inf in ${inface}
	do
		local -a inf_arg=()
		case ${inf} in
			any|ANY)
				;;
			
			*)
				local -a inf_arg=("-i" "${inf}")
				;;
		esac
	
	# outface
	local outf=
	for outf in ${outface}
	do
		local -a outf_arg=()
		case ${outf} in
			any|ANY)
				;;
			
			*)
				local -a outf_arg=("-o" "${outf}")
				;;
		esac
	
	# physin
	local inph=
	for inph in ${physin}
	do
		local -a inph_arg=()
		case ${inph} in
			any|ANY)
				;;
			
			*)
				local -a physdev_arg=("-m" "physdev")
				local -a inph_arg=("--physdev-in" "${inph}")
				;;
		esac
	
	# physout
	local outph=
	for outph in ${physout}
	do
		local -a outph_arg=()
		case ${outph} in
			any|ANY)
				;;
			
			*)
				local -a physdev_arg=("-m" "physdev")
				local -a outph_arg=("--physdev-out" "${outph}")
				;;
		esac
	
	# sport
	local sp=
	for sp in ${sport}
	do
		local -a sp_arg=()
		case ${sp} in
			any|ANY)
				;;
			
			*)
				local -a sp_arg=("--sport" "${sp}")
				;;
		esac
	
	# dport
	local dp=
	for dp in ${dport}
	do
		local -a dp_arg=()
		case ${dp} in
			any|ANY)
				;;
			
			*)
				local -a dp_arg=("--dport" "${dp}")
				;;
		esac
	
	# mac
	local mc=
	for mc in ${mac}
	do
		local -a mc_arg=()
		case ${mc} in
			any|ANY)
				;;
			
			*)
				local -a mc_arg=("-m" "mac" "--mac-source" "${mc}")
				;;
		esac
	
	# src
	local s=
	for s in ${src}
	do
		local -a s_arg=()
		case ${s} in
			any|ANY)
				;;
			
			*)
				local -a s_arg=("-s" "${s}")
				;;
		esac
	
	# dst
	local d=
	for d in ${dst}
	do
		local -a d_arg=()
		case ${d} in
			any|ANY)
				;;
			
			*)
				local -a d_arg=("-d" "${d}")
				;;
		esac
	
	# state
	local -a state_arg=()
	if [ ! -z "${state}" ]
	then
		local -a state_arg=("-m" "state" "${statenot}" "--state" "${state}")
	fi
	
	# limit
	local -a limit_arg=()
	if [ ! -z "${limit}" ]
	then
		local -a limit_arg=("-m" "limit" "--limit" "${limit}" "--limit-burst" "${burst}")
	fi
	
	# iplimit
	local -a iplimit_arg=()
	if [ ! -z "${iplimit}" ]
	then
		local -a iplimit_arg=("-m" "iplimit" "--iplimit-above" "${iplimit}" "--iplimit-mask" "${iplimit_mask}")
	fi
	
	# build the command
	declare -a basecmd=("${inf_arg[@]}" "${outf_arg[@]}" "${physdev_arg[@]}" "${inph_arg[@]}" "${outph_arg[@]}" "${limit_arg[@]}" "${iplimit_arg[@]}" "${proto_arg[@]}" "${s_arg[@]}" "${sp_arg[@]}" "${d_arg[@]}" "${dp_arg[@]}" "${owner_arg[@]}" "${uid_arg[@]}" "${gid_arg[@]}" "${pid_arg[@]}" "${sid_arg[@]}" "${cmd_arg[@]}" "${state_arg[@]}" "${mc_arg[@]}" "${mark_arg[@]}" "${tos_arg[@]}" "${dscp_arg[@]}")
	
	# log mode selection
	local -a logopts_arg=()
	if [ "${FIREHOL_LOG_MODE}" = "ULOG" ]
	then
		local -a logopts_arg=("--ulog-prefix='${logtxt}:'")
	else
		local -a logopts_arg=("--log-level" "${loglevel}" "--log-prefix='${logtxt}:'")
	fi
	
	# log / loglimit
	case "${log}" in
		'')
			;;
		
		limit)
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -m limit --limit "${FIREHOL_LOG_FREQUENCY}" --limit-burst "${FIREHOL_LOG_BURST}" -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
			;;
			
		normal)
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom}  -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
			;;
			
		*)
			error "Unknown log value '${log}'."
			;;
	esac
	
	# do it!
	rule_action_param "${action}" "${pr}" "${statenot}" "${state}" "${table}" "${action_param[@]}" -- ${table} -A "${chain}" "${basecmd[@]}" ${custom}
	
	done # dst
	done # src
	done # mac
	done # dport
	done # sport
	done # physout
	done # physin
	done # outface
	done # inface
	done # proto
	done # dscp
	done # tos
	done # mark
	done # cmd
	done # sid
	done # pid
	done # gid
	done # uid
	
	test ${failed} -gt 0 && error "There are ${failed} failed commands." && return 1
	return 0
}


softwarning() {
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "WARNING"
	echo >&2 "WHAT   : ${work_function}"
	echo >&2 "WHY    :" "$@"
	printf >&2 "COMMAND: "; printf >&2 "%q " "${work_realcmd[@]}"; echo >&2
	echo >&2 "SOURCE : line ${FIREHOL_LINEID} of ${FIREHOL_CONFIG}"
	echo >&2
	
	return 0
}

# ------------------------------------------------------------------------------
# error - error reporting while still parsing the configuration file
# WHY:
# This is the error handler that presents to the user detected errors during
# processing FireHOL's configuration file.
# This command is directly called by other functions of FireHOL.

error() {
	work_error=$[work_error + 1]
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "ERROR #: ${work_error}"
	echo >&2 "WHAT   : ${work_function}"
	echo >&2 "WHY    :" "$@"
	printf >&2 "COMMAND: "; printf >&2 "%q " "${work_realcmd[@]}"; echo >&2
	echo >&2 "SOURCE : line ${FIREHOL_LINEID} of ${FIREHOL_CONFIG}"
	echo >&2
	
	return 0
}


# ------------------------------------------------------------------------------
# runtime_error - postprocessing evaluation of commands run
# WHY:
# The generated iptables commands must be checked for errors in case they fail.
# This command is executed after every postprocessing command to find out
# if it has been successfull or failed.

runtime_error() {
	local type="ERROR"
	local id=
	
	case "${1}" in
		error)
			local type="ERROR  "
			work_final_status=$[work_final_status + 1]
			local id="# ${work_final_status}."
			;;
			
		warn)
			local type="WARNING"
			local id="This might or might not affect the operation of your firewall."
			;;
		
		*)
			work_final_status=$[work_final_status + 1]
			local id="# ${work_final_status}."
			
			echo >&2
			echo >&2
			echo >&2 "*** unsupported final status type '${1}'. Assuming it is 'ERROR'"
			echo >&2
			echo >&2
			;;
	esac
	shift
	
	local ret="${1}"; shift
	local line="${1}"; shift
	
	echo >&2
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "${type} : ${id}"
	echo >&2 "WHAT    : A runtime command failed to execute (returned error ${ret})."
	echo >&2 "SOURCE  : line ${line} of ${FIREHOL_CONFIG}"
	printf >&2 "COMMAND : "
	printf >&2 "%q " "$@"
	printf >&2 "\n"
	echo >&2 "OUTPUT  : "
	echo >&2
	${CAT_CMD} ${FIREHOL_OUTPUT}.log
	echo >&2
	
	return 0
}


# ------------------------------------------------------------------------------
# chain_exists - find if chain name has already being specified
# WHY:
# We have to make sure each service gets its own chain.
# Although FireHOL chain naming makes chains with unique names, this is just
# an extra sanity check.

chain_exists() {
	local chain="${1}"
	
	test -f "${FIREHOL_CHAINS_DIR}/${chain}" && return 1
	return 0
}


# ------------------------------------------------------------------------------
# create_chain - create a chain and link it to the firewall
# WHY:
# When a chain is created it must somehow to be linked to the rest of the
# firewall apropriately. This function first creates the chain and then
# it links it to its final position within the generated firewall.

create_chain() {
	local table="${1}"
	local newchain="${2}"
	local oldchain="${3}"
	shift 3
	
	set_work_function "Creating chain '${newchain}' under '${oldchain}' in table '${table}'"
	
	chain_exists "${newchain}"
	test $? -eq 1 && error "Chain '${newchain}' already exists." && return 1
	
	iptables -t ${table} -N "${newchain}" || return 1
	${TOUCH_CMD} "${FIREHOL_CHAINS_DIR}/${newchain}"
	
	rule table ${table} chain "${oldchain}" action "${newchain}" "$@" || return 1
	
	return 0
}


# ------------------------------------------------------------------------------
# smart_function - find the valid service definition for a service
# WHY:
# FireHOL supports simple and complex services. This function first tries to
# detect if there are the proper variables set for a simple service, and if
# they do not exist, it then tries to find the complex function definition for
# the service.
#
# Additionally, it creates a chain for the subcommand.

smart_function() {
	local type="${1}"	# The current subcommand: server/client/route
	local services="${2}"	# The services to implement
	shift 2
	
	local service=
	for service in $services
	do
		local servname="${service}"
		test "${service}" = "custom" && local servname="${1}"
		
		set_work_function "Preparing for service '${service}' of type '${type}' under interface '${work_name}'"
		
		# Increase the command counter, to make all chains within a primary
		# command, unique.
		work_counter=$[work_counter + 1]
		
		local suffix="u${work_counter}"
		case "${type}" in
			client)
				suffix="c${work_counter}"
				;;
			
			server)
				suffix="s${work_counter}"
				;;
			
			route)
				suffix="r${work_counter}"
				;;
			
			*)	error "Cannot understand type '${type}'."
				return 1
				;;
		esac
		
		local mychain="${work_name}_${servname}_${suffix}"
		
		create_chain filter "in_${mychain}" "in_${work_name}" || return 1
		create_chain filter "out_${mychain}" "out_${work_name}" || return 1
		
		# Try the simple services first
		simple_service "${mychain}" "${type}" "${service}" "$@"
		local ret=$?
		
		# simple service completed succesfully.
		test $ret -eq 0 && continue
		
		# simple service exists but failed.
		if [ $ret -ne 127 ]
		then
			error "Simple service '${service}' returned an error ($ret)."
			return 1
		fi
		
		
		# Try the custom services
		local fn="rules_${service}"
		
		set_work_function "Running complex rules function ${fn}() for ${type} '${service}'"
		
		"${fn}" "${mychain}" "${type}" "$@"
		local ret=$?
		test $ret -eq 0 && continue
		
		if [ $ret -eq 127 ]
		then
			error "There is no service '${service}' defined."
		else
			error "Complex service '${service}' returned an error ($ret)."
		fi
		return 1
	done
	
	return 0
}

# ------------------------------------------------------------------------------
# simple_service - convert a service definition to an inline service definition
# WHY:
# When a simple service is detected, there must be someone to call
# rules_custom() with the appropriate service definition parameters.

simple_service() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	local server="${1}"; shift
	
	local server_varname="server_${server}_ports"
	eval local server_ports="\$${server_varname}"
	
	local client_varname="client_${server}_ports"
	eval local client_ports="\$${client_varname}"
	
	test -z "${server_ports}" -o -z "${client_ports}" && return 127
	
	local x=
	local varname="require_${server}_modules"
	eval local value="\$${varname}"
	for x in ${value}
	do
		require_kernel_module $x || return 1
	done
	
	if [ ${FIREHOL_NAT} -eq 1 ]
	then
		local varname="require_${server}_nat_modules"
		eval local value="\$${varname}"
		for x in ${value}
		do
			require_kernel_module $x || return 1
		done
	fi
	
	set_work_function "Running simple rules for  ${type} '${service}'"
	
	rules_custom "${mychain}" "${type}" "${server}" "${server_ports}" "${client_ports}" "$@"
	return $?
}

show_work_realcmd() {
	test ${FIREHOL_EXPLAIN} -eq 1 && return 0
	
	(
		printf "\n\n"
		printf "# === CONFIGURATION STATEMENT =================================================\n"
		printf "# CONF:%3s>>>	" ${FIREHOL_LINEID}
		
		case $1 in
			2)	printf "	"
				;;
			*)	;;
		esac
		
		printf "%q " "${work_realcmd[@]}"
		printf "\n\n"
	) >>${FIREHOL_OUTPUT}
}

work_realcmd_primary() {
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 1
}

work_realcmd_secondary() {
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 2
}

work_realcmd_helper() {	
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 3
}



# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# START UP SCRIPT PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# On non RedHat machines we need success() and failure()
success() {
	printf " OK"
}
failure() {
	echo " FAILED"
}

# ------------------------------------------------------------------------------
# A small part bellow is copied from /etc/init.d/iptables

# On RedHat systems this will define success() and failure()
test -f /etc/init.d/functions && . /etc/init.d/functions

if [ -z "${IPTABLES_CMD}" -o ! -x "${IPTABLES_CMD}" ]; then
	echo >&2 "Cannot find an executables iptables command."
	exit 0
fi

KERNELMAJ=`${UNAME_CMD} -r | ${SED_CMD}                   -e 's,\..*,,'`
KERNELMIN=`${UNAME_CMD} -r | ${SED_CMD} -e 's,[^\.]*\.,,' -e 's,\..*,,'`

if [ "$KERNELMAJ" -lt 2 ] ; then
	echo >&2 "FireHOL requires a kernel version higher than 2.3."
	exit 0
fi
if [ "$KERNELMAJ" -eq 2 -a "$KERNELMIN" -lt 3 ] ; then
	echo >&2 "FireHOL requires a kernel version higher than 2.3."
	exit 0
fi

if  ${LSMOD_CMD} 2>/dev/null | ${GREP_CMD} -q ipchains ; then
	# Don't do both
	echo >&2 "ipchains is loaded in the kernel. Please remove ipchains to run iptables."
	exit 0
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# COMMAND LINE ARGUMENTS PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

me="${0}"
arg="${1}"
shift

case "${arg}" in
	explain)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_EXPLAIN=1
		;;
	
	helpme|wizard)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_WIZARD=1
		;;
	
	try)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=1
		;;
	
	start)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=0
		;;
	
	stop)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		
		test -f /var/lock/subsys/firehol && ${RM_CMD} -f /var/lock/subsys/firehol
		test -f /var/lock/subsys/iptables && ${RM_CMD} -f /var/lock/subsys/iptables
		
		echo -n $"FireHOL: Clearing Firewall:"
		load_kernel_module ip_tables
		tables=`${CAT_CMD} /proc/net/ip_tables_names`
		for t in ${tables}
		do
			${IPTABLES_CMD} -t "${t}" -F
			${IPTABLES_CMD} -t "${t}" -X
			${IPTABLES_CMD} -t "${t}" -Z
			
			# Find all default chains in this table.
			chains=`${IPTABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
			for c in ${chains}
			do
				${IPTABLES_CMD} -t "${t}" -P "${c}" ACCEPT
			done
		done
		success $"FireHOL: Clearing Firewall:"
		echo
		
		exit 0
		;;
	
	restart|force-reload)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=0
		;;
	
	condrestart)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=0
		if [ -f /var/lock/subsys/firehol ]
		then
			exit 0
		fi
		;;
	
	status)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		(
			echo 
			echo "--- MANGLE ---------------------------------------------------------------------"
			echo 
			${IPTABLES_CMD} -t mangle -nxvL
			
			echo 
			echo 
			echo "--- NAT ------------------------------------------------------------------------"
			echo 
			${IPTABLES_CMD} -t nat -nxvL
			
			echo 
			echo 
			echo "--- FILTER ---------------------------------------------------------------------"
			echo 
			${IPTABLES_CMD} -nxvL
		) | ${LESS_CMD}
		exit $?
		;;
	
	panic)
		ssh_src=
		ssh_sport="0:65535"
		ssh_dport="0:65535"
		if [ ! -z "${SSH_CLIENT}" ]
		then
			set -- ${SSH_CLIENT}
			ssh_src="${1}"
			ssh_sport="${2}"
			ssh_dport="${3}"
		elif [ ! -z "${1}" ]
		then
			ssh_src="${1}"
		fi
		
		echo -n $"FireHOL: Blocking all communications:"
		load_kernel_module ip_tables
		tables=`${CAT_CMD} /proc/net/ip_tables_names`
		for t in ${tables}
		do
			${IPTABLES_CMD} -t "${t}" -F
			${IPTABLES_CMD} -t "${t}" -X
			${IPTABLES_CMD} -t "${t}" -Z
			
			# Find all default chains in this table.
			chains=`${IPTABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
			for c in ${chains}
			do
				${IPTABLES_CMD} -t "${t}" -P "${c}" ACCEPT
				
				if [ ! -z "${ssh_src}" ]
				then
					${IPTABLES_CMD} -t "${t}" -A "${c}" -p tcp -s "${ssh_src}" --sport "${ssh_sport}" --dport "${ssh_dport}" -m state --state ESTABLISHED -j ACCEPT
					${IPTABLES_CMD} -t "${t}" -A "${c}" -p tcp -d "${ssh_src}" --dport "${ssh_sport}" --sport "${ssh_dport}" -m state --state ESTABLISHED -j ACCEPT
				fi
				${IPTABLES_CMD} -t "${t}" -A "${c}" -j DROP
			done
		done
		success $"FireHOL: Blocking all communications:"
		echo
		
		exit 0
		;;
	
	save)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=0
		FIREHOL_SAVE=1
		;;
		
	debug)
		test ! -z "${1}" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_TRY=0
		FIREHOL_DEBUG=1
		;;
	
	*)	if [ ! -z "${arg}" -a -f "${arg}" ]
		then
			FIREHOL_CONFIG="${arg}"
			arg="${1}"
			test "${arg}" = "--" && arg="" && shift
			test -z "${arg}" && arg="try"
			
			case "${arg}" in
				start)
					FIREHOL_TRY=0
					FIREHOL_DEBUG=0
					;;
					
				try)
					FIREHOL_TRY=1
					FIREHOL_DEBUG=0
					;;
					
				debug)
					FIREHOL_TRY=0
					FIREHOL_DEBUG=1
					;;
				
				*)
					echo "Cannot accept command line argument '${arg}' here."
					exit 1
					;;
			esac
		else
		
		${CAT_CMD} <<EOF
$Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
(C) Copyright 2003, Costa Tsaousis <costa@tsaousis.gr>
FireHOL is distributed under GPL.

EOF

		${CAT_CMD} <<EOF
FireHOL supports the following command line arguments (only one of them):

	start		to activate the firewall configuration.
			The configuration is expected to be found in
			${FIREHOL_CONFIG_DIR}/firehol.conf
			
	try		to activate the firewall, but wait until
			the user types the word "commit". If this word
			is not typed within 30 seconds, the previous
			firewall is restored.
			
	stop		to stop a running iptables firewall.
			This will allow all traffic to pass unchecked.
		
	restart		this is an alias for start and is given for
			compatibility with /etc/init.d/iptables.
			
	condrestart	will start the firewall only if it is not
			already active. It does not detect a modified
			configuration file.
	
	status		will show the running firewall, as in:
			${IPTABLES_CMD} -nxvL | ${LESS_CMD}
			
	panic		will block all IP communication.
	
	save		to start the firewall and then save it to the
			place where /etc/init.d/iptables looks for it.
			
			Note that not all firewalls will work if
			restored with:
			/etc/init.d/iptables start
			
	debug		to parse the configuration file but instead of
			activating it, to show the generated iptables
			statements.
	
	explain		to enter interactive mode and accept configuration
			directives. It also gives the iptables commands
			for each directive together with reasoning.
			
	helpme	or	to enter a wizard mode where FireHOL will try
	wizard		to figure out the configuration you need.
			You can redirect the standard output of FireHOL to
			a file to get the config to this file.
			
	<a filename>	a different configuration file.
			If not other argument is given, the configuration
			will be "tried" (default = try).
			Otherwise the argument next to the filename can
			be one of 'start', 'debug' and 'try'.


-------------------------------------------------------------------------

FireHOL supports the following services (sorted by name):
EOF


		(
			# The simple services
			${CAT_CMD} "${me}"				|\
				${GREP_CMD} -e "^server_.*_ports="	|\
				${CUT_CMD} -d '=' -f 1			|\
				${SED_CMD} "s/^server_//"		|\
				${SED_CMD} "s/_ports\$//"
			
			# The complex services
			${CAT_CMD} "${me}"				|\
				${GREP_CMD} -e "^rules_.*()"		|\
				${CUT_CMD} -d '(' -f 1			|\
				${SED_CMD} "s/^rules_/(*) /"
		) | ${SORT_CMD} | ${UNIQ_CMD} |\
		(
			x=0
			while read
			do
				x=$[x + 1]
				if [ $x -gt 4 ]
				then
					printf "\n"
					x=1
				fi
				printf "% 16s |" "$REPLY"
			done
			printf "\n\n"
		)
		
		${CAT_CMD} <<EOF

Services marked with (*) are "smart" or complex services.
All the others are simple single socket services.

Please note that the service:
	
	all	matches all packets, all protocols, all of everything,
		while ensuring that required kernel modules are loaded.
	
	any	allows the matching of packets with unusual rules, like
		only protocol but no ports. If service any is used
		without other parameters, it does what service all does
		but it does not handle kernel modules.
		For example, to match GRE traffic use:
		
		server any mygre accept proto 47
		
		Service any does not handle kernel modules.
		
	custom	allows the definition of a custom service.
		The template is:
		
		server custom name protocol/sport cport accept
		
		where name is just a name, protocol is the protocol the
		service uses (tcp, udp, etc), sport is server port,
		cport is the client port. For example, IMAP4 is:
		
		server custom imap tcp/143 default accept


For more information about FireHOL, please refer to:

		http://firehol.sourceforge.net

-------------------------------------------------------------------------
FireHOL controls your firewall. You should want to get updates quickly.
Subscribe (at the home page) to get notified of new releases.
-------------------------------------------------------------------------

YOU DO NOT KNOW WHAT TO DO? FireHOL can help you! Just run it with the
argument 'helpme' and it will generate its configuration file for this
machine. Your running firewall will not be altered or stopped, and no
systems settings will be modified. Just run:

${FIREHOL_FILE} helpme >/tmp/firehol.conf

and you will get the configuration written to /tmp/firehol.conf

EOF
		exit 1
		
		fi
		;;
esac

# Remove the next arg if it is --
test "${1}" = "--" && shift

if [ ${FIREHOL_EXPLAIN} -eq 0 -a ${FIREHOL_WIZARD} -eq 0 -a ! -f "${FIREHOL_CONFIG}" ]
then
	echo -n $"FireHOL config ${FIREHOL_CONFIG} not found:"
	failure $"FireHOL config ${FIREHOL_CONFIG} not found:"
	echo
	exit 1
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING - Interactive mode
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

if [ ${FIREHOL_EXPLAIN} -eq 1 ]
then
	FIREHOL_CONFIG="Interactive User Input"
	FIREHOL_LINEID="1"
	
	FIREHOL_TEMP_CONFIG="${FIREHOL_DIR}/firehol.conf"
	
	echo "version ${FIREHOL_VERSION}" >"${FIREHOL_TEMP_CONFIG}"
	version ${FIREHOL_VERSION}
	
	${CAT_CMD} <<EOF

$Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
(C) Copyright 2003, Costa Tsaousis <costa@tsaousis.gr>
FireHOL is distributed under GPL.
Home Page: http://firehol.sourceforge.net

--------------------------------------------------------------------------------
FireHOL controls your firewall. You should want to get updates quickly.
Subscribe (at the home page) to get notified of new releases.
--------------------------------------------------------------------------------

You can now start typing FireHOL configuration directives.
Special interactive commands: help, show, quit

EOF
	
	while [ 1 = 1 ]
	do
		read -p "# FireHOL [${work_cmd}:${work_name}] > " -e -r
		test -z "${REPLY}" && continue
		
		set_work_function -ne "Executing user input"
		
		while [ 1 = 1 ]
		do
		
		set -- ${REPLY}
		
		case "${1}" in
			help)
				${CAT_CMD} <<EOF
You can use anything a FireHOL configuration file accepts, including variables,
loops, etc. Take only care to write loops in one row.

Additionaly, you can use the following commands:
	
	help	to print this text on your screen.
	
	show	to show all the successfull commands so far.
	
	quit	to show the interactively given configuration file
		and quit.
	
	in	same as typing: interface eth0 internet
		This is used as a shortcut to get into the server/client
		mode in which you can test the rules for certain
		services.

EOF
				break
				;;
				
			show)
				echo
				${CAT_CMD} "${FIREHOL_TEMP_CONFIG}"
				echo
				break
				;;
				
			quit)
				echo
				${CAT_CMD} "${FIREHOL_TEMP_CONFIG}"
				echo
				exit 1
				;;
				
			in)
				REPLY="interface eth0 internet"
				continue
				;;
				
			*)
				${CAT_CMD} <<EOF

# \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
# Cmd Line : ${FIREHOL_LINEID}
# Command  : ${REPLY}
EOF
				eval "$@"
				if [ $? -gt 0 ]
				then
					printf "\n# > FAILED <\n"
				else
					if [ "${1}" = "interface" -o "${1}" = "router" ]
					then
						echo >>"${FIREHOL_TEMP_CONFIG}"
					else
						printf "	" >>"${FIREHOL_TEMP_CONFIG}"
					fi
					
					printf "%s\n" "${REPLY}" >>"${FIREHOL_TEMP_CONFIG}"
					
					FIREHOL_LINEID=$[FIREHOL_LINEID + 1]
					
					printf "\n# > OK <\n"
				fi
				break
				;;
		esac
		
		break
		done
	done
	
	exit 0
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING - help wizard
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

if [ ${FIREHOL_WIZARD} -eq 1 ]
then
	wizard_ask() {
		local prompt="${1}"; shift
		local def="${1}"; shift
		
		echo
		
		while [ 1 = 1 ]
		do
			printf >&2 "%s [%s] > " "${prompt}" "${def}"
			read
			
			local ans="${REPLY}"
			
			test -z "${ans}" && ans="${def}"
			
			local c=0
			while [ $c -le $# ]
			do
				eval local t="\${${c}}"
				
				test "${ans}" = "${t}" && break
				c=$[c + 1]
			done
			
			test $c -le $# && return $c
			
			printf >&2 "*** '${ans}' is not a valid answer. Pick one of "
			printf >&2 "%s " "$@"
			echo >&2 
			echo >&2 
		done
		
		return 0
	}
	
	ip_in_net() {
		local ip="${1}"; shift
		local net="${1}"; shift
		
		if [ -z "${ip}" -o -z "${net}" ]
		then
			return 1
		fi
		
		test "${net}" = "default" && net="0.0.0.0/0"
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		
		set -- `echo ${net} | ${TR_CMD} './' '  '`
		local n1=${1}
		local n2=${2}
		local n3=${3}
		local n4=${4}
		local n5=${5:-32}
		
		local i=$[i1*256*256*256 + i2*256*256 + i3*256 + i4]
		local n=$[n1*256*256*256 + n2*256*256 + n3*256 + n4]
		
#		echo "IP : '${i1}' . '${i2}' . '${i3}' . '${i4}'"
#		echo "NET: '${n1}' . '${n2}' . '${n3}' . '${n4}' / '${n5}'"
		
		local d=1
		local c=${n5}
		while [ $c -lt 32 ]
		do
			c=$[c + 1]
			d=$[d * 2]
		done
		
		local nm=$[n + d - 1]
		
		printf "### DEBUG: Is ${ip} part of network ${net}? "
		
		if [ ${i} -ge ${n} -a ${i} -le ${nm} ]
		then
			echo "yes"
			return 0
		else
			echo "no"
			return 1
		fi
	}
	
	ip_is_net() {
		local ip="${1}"; shift
		local net="${1}"; shift
		
		if [ -z "${ip}" -o -z "${net}" ]
		then
			return 1
		fi
		
		test "${net}" = "default" && net="0.0.0.0/0"
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		local i5=${5:-32}
		
		set -- `echo ${net} | ${TR_CMD} './' '  '`
		local n1=${1}
		local n2=${2}
		local n3=${3}
		local n4=${4}
		local n5=${5:-32}
		
		local i=$[i1*256*256*256 + i2*256*256 + i3*256 + i4]
		local n=$[n1*256*256*256 + n2*256*256 + n3*256 + n4]
		
		if [ ${i} -eq ${n} -a ${i5} -eq ${n5} ]
		then
			return 0
		else
			return 1
		fi
	}
	
	ip2net() {
		local ip="${1}"; shift
		
		if [ -z "${ip}" ]
		then
			return 0
		fi
		
		if [ "${ip}" = "default" ]
		then
			echo "default"
			return 0
		fi
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		local i5=${5:-32}
		
		echo ${i1}.${i2}.${i3}.${i4}/${i5}
	}
	
	ips2net() {
		
		(
			if [ "A${1}" = "A-" ]
			then
				while read ip
				do
					ip2net ${ip}
				done
			else
				while [ ! -z "${1}" ]
				do
					ip2net ${1}
					shift 
				done
			fi
		) | ${SORT_CMD} | ${UNIQ_CMD} | ${TR_CMD} "\n" " "
	}
	
	cd "${FIREHOL_DIR}"
	"${MKDIR_CMD}" ports
	"${MKDIR_CMD}" keys
	cd ports
	"${MKDIR_CMD}" tcp
	"${MKDIR_CMD}" udp
	
	"${CAT_CMD}" >&2 <<EOF

$Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
(C) Copyright 2003, Costa Tsaousis <costa@tsaousis.gr>
FireHOL is distributed under GPL.
Home Page: http://firehol.sourceforge.net

--------------------------------------------------------------------------------
FireHOL controls your firewall. You should want to get updates quickly.
Subscribe (at the home page) to get notified of new releases.
--------------------------------------------------------------------------------

FireHOL will now try to figure out its configuration file on this system.
Please have all the services and network interfaces on this system running.

Your running firewall will not be stopped or altered.

You can re-run the same command with output redirection to get the config
to a file. Example:

EOF
	echo >&2 "${FIREHOL_FILE} helpme >/tmp/firehol.conf"
	echo >&2 
	echo >&2 
		
	echo >&2 
	echo >&2 "Building list of known services."
	echo >&2 "Please wait..."
	
	${CAT_CMD} /etc/services	|\
		${TR_CMD} '\t' ' '	|\
		${SED_CMD} "s/ \+/ /g"	>services
	
	for c in `echo ${!server_*} | ${TR_CMD} ' ' '\n' | ${GREP_CMD} "_ports$"`
	do
		serv=`echo $c | ${SED_CMD} "s/server_//" | ${SED_CMD} "s/_ports//"`
		
		eval "ret=\${$c}"
		for x in ${ret}
		do
			proto=`echo $x | ${CUT_CMD} -d '/' -f 1`
			port=`echo $x | ${CUT_CMD} -d '/' -f 2`
			
			test ! -d "${proto}" && continue
			
			nport=`${EGREP_CMD} "^${port}[[:space:]][0-9]+/${proto}" services | ${CUT_CMD} -d ' ' -f 2 | ${CUT_CMD} -d '/' -f 1`
			test -z "${nport}" && nport="${port}"
			
			echo "server ${serv}" >"${proto}/${nport}"
		done
	done
	
	echo "server ftp" >tcp/21
	echo "server nfs" >udp/2049
	
	echo "client amanda" >udp/10080
	
	echo "server dhcp" >udp/67
	echo "server dhcp" >tcp/67
	
	echo "client dhcp" >udp/68
	echo "client dhcp" >tcp/68
	
	echo "server emule" >tcp/4662
	
	echo "server pptp" >tcp/1723
	
	echo "server samba" >udp/137
	echo "server samba" >udp/138
	echo "server samba" >tcp/139
	
	
	wizard_ask "Press RETURN to start." "continue" "continue"
	
	echo >&2 
	echo >&2 "--- snip --- snip --- snip --- snip ---"
	echo >&2 
	
	echo "#!${FIREHOL_FILE}"
	echo "# ------------------------------------------------------------------------------"
	echo "# This feature is under construction -- use it with care."
	echo "#             *** NEVER USE THIS CONFIG AS-IS ***"
	echo "# "

	${CAT_CMD} <<EOF
# $Id: firehol.sh,v 1.226 2005/01/25 21:28:19 ktsaou Exp $
# (C) Copyright 2003, Costa Tsaousis <costa@tsaousis.gr>
# FireHOL is distributed under GPL.
# Home Page: http://firehol.sourceforge.net
# 
# ------------------------------------------------------------------------------
# FireHOL controls your firewall. You should want to get updates quickly.
# Subscribe (at the home page) to get notified of new releases.
# ------------------------------------------------------------------------------
#
EOF
	echo "# This config will have the same effect as NO PROTECTION!"
	echo "# Everything that found to be running, is allowed."
	echo "# "
	echo "# Date: `${DATE_CMD}` on host `${HOSTNAME_CMD}`"
	echo "# "
	echo "# The TODOs bellow, are YOUR to-dos!"
	echo
	
	# globals for routing
	set -a found_interfaces=
	set -a found_ips=
	set -a found_nets=
	set -a found_excludes=
	
	helpme_iface() {
		local route="${1}"; shift
		local i="${1}"; shift
		local iface="${1}"; shift
		local ifip="${1}"; shift
		local ifnets="${1}"; shift
		local ifreason="${1}"; shift
		
		# one argument left: ifnets_excluded
		
		if [ "${route}" = "route" ]
		then
			found_interfaces[$i]="${iface}"
			found_ips[$i]="${ifip}"
			found_nets[$i]="${ifnets}"
			found_excludes[$i]="${1}"
		fi
		
		if [ "${ifnets}" = "default" ]
		then
			ifnets="not \"\${UNROUTABLE_IPS} ${1}\""
		else
			ifnets="\"${ifnets}\""
		fi
		
		# output the interface
		echo
		echo "# Interface No $i."
		echo "# The purpose of this interface is to control the traffic"
		if [ ! -z "${ifreason}" ]
		then
			echo "# ${ifreason}."
		else
			echo "# on the ${iface} interface with IP ${ifip} (net: ${ifnets})."
		fi
		echo "# TODO: Change \"interface${i}\" to something with meaning to you."
		echo "# TODO: Check the optional rule parameters (src/dst)."
		echo "# TODO: Remove 'dst ${ifip}' if this is dynamically assigned."
		echo "interface ${iface} interface${i} src ${ifnets} dst ${ifip}"
		echo
		echo "	# The default policy is DROP. You can be more polite with REJECT."
		echo "	# Prefer to be polite on your own clients to prevent timeouts."
		echo "	policy drop"
		echo
		echo "	# If you don't trust the clients behind ${iface} (net ${ifnets}),"
		echo "	# add something like this."
		echo "	# > protection strong"
		echo
		echo "	# Here are the services listening on ${iface}."
		echo "	# TODO: Normally, you will have to remove those not needed."
		
		(
			local x=
			local ports=
			for x in `${NETSTAT_CMD} -an | ${EGREP_CMD} "^tcp" | ${GREP_CMD} "0.0.0.0:*" | ${EGREP_CMD} " (${ifip}|0.0.0.0):[0-9]+" | ${CUT_CMD} -d ':' -f 2 | ${CUT_CMD} -d ' ' -f 1 | ${SORT_CMD} -n | ${UNIQ_CMD}`
			do
				if [ -f "tcp/${x}" ]
				then
					echo "	`${CAT_CMD} tcp/${x}` accept"
				else
					ports="${ports} tcp/${x}"
				fi
			done
			
			for x in `${NETSTAT_CMD} -an | ${EGREP_CMD} "^udp" | ${GREP_CMD} "0.0.0.0:*" | ${EGREP_CMD} " (${ifip}|0.0.0.0):[0-9]+" | ${CUT_CMD} -d ':' -f 2 | ${CUT_CMD} -d ' ' -f 1 | ${SORT_CMD} -n | ${UNIQ_CMD}`
			do
				if [ -f "udp/${x}" ]
				then
					echo "	`${CAT_CMD} udp/${x}` accept"
				else
					ports="${ports} udp/${x}"
				fi
			done
			
			echo "	server ICMP accept"
			
			echo "${ports}" | ${TR_CMD} " " "\n" | ${SORT_CMD} -n | ${UNIQ_CMD} | ${TR_CMD} "\n" " " >unknown.ports
		) | ${SORT_CMD} | ${UNIQ_CMD}
		
		echo
		echo "	# The following ${iface} server ports are not known by FireHOL:"
		echo "	# `${CAT_CMD} unknown.ports`"
		echo "	# TODO: If you need any of them, you should define new services."
		echo "	#       (see Adding Services at the web site - http://firehol.sf.net)."
		echo
		
		echo "	# The following means that this machine can REQUEST anything via ${iface}."
		echo "	# TODO: On production servers, avoid this and allow only the"
		echo "	#       client services you really need."
		echo "	client all accept"
		echo
	}
	
	interfaces=`${IP_CMD} link show | ${EGREP_CMD} "^[0-9A-Za-z]+:" | ${CUT_CMD} -d ':' -f 2 | ${SED_CMD} "s/^ //" | ${GREP_CMD} -v "^lo$" | ${SORT_CMD} | ${UNIQ_CMD} | ${TR_CMD} "\n" " "`
	gw_if=`${IP_CMD} route show | ${GREP_CMD} "^default" | ${SED_CMD} "s/dev /dev:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^dev:" | ${CUT_CMD} -d ':' -f 2`
	gw_ip=`${IP_CMD} route show | ${GREP_CMD} "^default" | ${SED_CMD} "s/via /via:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^via:" | ${CUT_CMD} -d ':' -f 2 | ips2net -`
	
	i=0
	for iface in ${interfaces}
	do
		echo "### DEBUG: Processing interface '${iface}'"
		ips=`${IP_CMD} addr show dev ${iface} | ${SED_CMD} "s/  / /g" | ${SED_CMD} "s/  / /g" | ${SED_CMD} "s/  / /g" | ${GREP_CMD} "^ inet " | ${CUT_CMD} -d ' ' -f 3 | ${CUT_CMD} -d '/' -f 1 | ips2net -`
		peer=`${IP_CMD} addr show dev ${iface} | ${SED_CMD} "s/  / /g" | ${SED_CMD} "s/  / /g" | ${SED_CMD} "s/  / /g" | ${SED_CMD} "s/peer /peer:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^peer:" | ${CUT_CMD} -d ':' -f 2 | ips2net -`
		nets=`${IP_CMD} route show dev ${iface} | ${CUT_CMD} -d ' ' -f 1 | ips2net -`
		
		if [ -z "${ips}" -o -z "${nets}" ]
		then
			echo
			echo "# Ignoring interface '${iface}' because does not have an IP or route."
			echo
			continue
		fi
		
		for ip in ${ips}
		do
			echo "### DEBUG: Processing IP ${ip} of interface '${iface}'"
			
			ifreason=""
			
			# find all the networks this IP can access directly
			# or through its peer
			netcount=0
			ifnets=
			ofnets=
			for net in ${nets}
			do
				test "${net}" = "default" && continue
				
				found=1
				ip_in_net ${ip} ${net}
				found=$?
				
				if [ ${found} -gt 0 -a ! -z "${peer}" ]
				then
					ip_in_net ${peer} ${net}
					found=$?
				fi
				
				if [ ${found} -eq 0 ]
				then
					# Add it to ifnets
					f=0; ff=0
					while [ $f -lt $netcount ]
					do
						if ip_in_net ${net} ${ifnets[$f]}
						then
							# Already satisfied
							ff=1
						elif ip_in_net ${ifnets[$f]} ${net}
						then
							# New one is superset of old
							ff=1
							ifnets[$f]=${net}
						fi
						
						f=$[f + 1]
					done
					
					if [ $ff -eq 0 ]
					then
						# Add it
						netcount=$[netcount + 1]
						ifnets=(${net} ${ifnets[@]})
					fi
				else
					ofnets=(${net} ${ofnets[@]})
				fi
			done
			
			# find all the networks this IP can access through gateways
			if [ ! -z "${ofnets[*]}" ]
			then
				for net in ${ofnets[@]}
				do
					test "${net}" = "default" && continue
					
					nn=`echo "${net}" | ${CUT_CMD} -d "/" -f 1`
					gw=`${IP_CMD} route show ${nn} dev ${iface} | ${EGREP_CMD} "^${nn}[[:space:]]+via[[:space:]][0-9\.]+" | ${CUT_CMD} -d ' ' -f 3 | ips2net -`
					test -z "${gw}" && continue
					
					for nn in ${ifnets[@]}
					do
						test "${nn}" = "default" && continue
						
						if ip_in_net ${gw} ${nn}
						then
							echo "### DEBUG: Route ${net} is accessed through ${gw}"
							
							# Add it to ifnets
							f=0; ff=0
							while [ $f -lt $netcount ]
							do
								if ip_in_net ${net} ${ifnets[$f]}
								then
									# Already satisfied
									ff=1
								elif ip_in_net ${ifnets[$f]} ${net}
								then
									# New one is superset of old
									ff=1
									ifnets[$f]=${net}
								fi
								
								f=$[f + 1]
							done
							
							if [ $ff -eq 0 ]
							then
								# Add it
								netcount=$[netcount + 1]
								ifnets=(${net} ${ifnets[@]})
							fi
							break
						fi
					done
				done
			fi
			
			# Don't produce an interface if this is just a peer that is also the default gw
			def_ignore_ifnets=0
			if (test ${netcount} -eq 1 -a "${gw_if}" = "${iface}" && ip_is_net "${peer}" "${ifnets[*]}" && ip_is_net "${gw_ip}" "${peer}")
			then
				echo "### DEBUG: Skipping ${iface} peer ${ifnets[*]} only interface (default gateway)."
				echo
				def_ignore_ifnets=1
			else
				i=$[i + 1]
				helpme_iface route $i "${iface}" "${ip}" "${ifnets[*]}" "${ifreason}"
			fi
			
			# Is this interface the default gateway too?
			if [ "${gw_if}" = "${iface}" ]
			then
				for nn in ${ifnets[@]}
				do
					if ip_in_net "${gw_ip}" ${nn}
					then
						echo "### DEBUG: Default gateway ${gw_ip} is part of network ${nn}"
						
						i=$[i + 1]
						helpme_iface route $i "${iface}" "${ip}" "default" "from/to unknown networks behind the default gateway ${gw_ip}" "`test ${def_ignore_ifnets} -eq 0 && echo "${ifnets[*]}"`"
						
						break
					fi
				done
			fi
		done
	done
		
	echo
	echo "# The above $i interfaces were found active at this moment."
	echo "# Add more interfaces that can potentially be activated in the future."
	echo "# FireHOL will not complain if you setup a firewall on an interface that is"
	echo "# not active when you activate the firewall."
	echo "# If you don't setup an interface, FireHOL will drop all traffic from or to"
	echo "# this interface, if and when it becomes available."
	echo "# Also, if an interface name dynamically changes (i.e. ppp0 may become ppp1)"
	echo "# you can use the plus (+) character to match all of them (i.e. ppp+)."
	echo
	
	if [ "1" = "`${CAT_CMD} /proc/sys/net/ipv4/ip_forward`" ]
	then
		x=0
		i=0
		while [ $i -lt ${#found_interfaces[*]} ]
		do
			i=$[i + 1]
			
			inface="${found_interfaces[$i]}"
			src="${found_nets[$i]}"
			
			case "${src}" in
				"default")
					src="not \"\${UNROUTABLE_IPS} ${found_excludes[$i]}\""
					;;
					
					*)
					src="\"${src}\""
					;;
			esac
			
			j=0
			while [ $j -lt ${#found_interfaces[*]} ]
			do
				j=$[j + 1]
				
				test $j -eq $i && continue
				
				outface="${found_interfaces[$j]}"
				dst="${found_nets[$j]}"
				dst_ip="${found_ips[$j]}"
				
				case "${dst}" in
					"default")
						dst="not \"\${UNROUTABLE_IPS} ${found_excludes[$j]}\""
						;;
						
						*)
						dst="\"${dst}\""
						;;
				esac
				
				# Make sure we are not routing to the same subnet
				test "${inface}" = "${outface}" -a "${src}" = "${dst}" && continue
				
				# Make sure this is not a duplicate router
				key="`echo ${inface}/${src}-${outface}/${dst} | ${TR_CMD} "/ \\\$\\\"{}" "______"`"
				test -f "${FIREHOL_DIR}/keys/${key}" && continue
				${TOUCH_CMD} "${FIREHOL_DIR}/keys/${key}"
				
				x=$[x + 1]
				
				echo
				echo "# Router No ${x}."
				echo "# Clients on ${inface} (from ${src}) accessing servers on ${outface} (to ${dst})."
				echo "# TODO: Change \"router${x}\" to something with meaning to you."
				echo "# TODO: Check the optional rule parameters (src/dst)."
				echo "router router${x} inface ${inface} outface ${outface} src ${src} dst ${dst}"
				echo 
				echo "	# If you don't trust the clients on ${inface} (from ${src}), or"
				echo "	# if you want to protect the servers on ${outface} (to ${dst}),"
				echo "	# uncomment the following line."
				echo "	# > protection strong"
				echo
				echo "	# To NAT client requests on the output of ${outface}, add this."
				echo "	# > masquerade"
				
				echo "	# Alternatively, you can SNAT them by placing this at the top of this config:"
				echo "	# > snat to ${dst_ip} outface ${outface} src ${src} dst ${dst}"
				echo "	# SNAT commands can be enhanced using 'proto', 'sport', 'dport', etc in order to"
				echo "	# NAT only some specific traffic."
				echo
				echo "	# TODO: This will allow all traffic to pass."
				echo "	# If you remove it, no REQUEST will pass matching this traffic."
				echo "	route all accept"
				echo
			done
		done
		
		if [ ${x} -eq 0 ]
		then
			echo
			echo
			echo "# No router statements have been produced, because your server"
			echo "# does not seem to need any."
			echo
		fi
	else
		echo
		echo
		echo "# No router statements have been produced, because your server"
		echo "# is not configured for forwarding traffic."
		echo
	fi
	
	exit 0
fi

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# --- Initialization -----------------------------------------------------------

fixed_iptables_save() {
	local tmp="${FIREHOL_DIR}/iptables-save-$$"
	local err=
	
	load_kernel_module ip_tables
	${IPTABLES_SAVE_CMD} -c >$tmp
	err=$?
	if [ ! $err -eq 0 ]
	then
		${RM_CMD} -f $tmp >/dev/null 2>&1
		return $err
	fi
	
	${CAT_CMD} ${tmp} |\
		${SED_CMD} "s/--uid-owner !/! --uid-owner /g"	|\
		${SED_CMD} "s/--gid-owner !/! --gid-owner /g"	|\
		${SED_CMD} "s/--pid-owner !/! --pid-owner /g"	|\
		${SED_CMD} "s/--sid-owner !/! --sid-owner /g"	|\
		${SED_CMD} "s/--cmd-owner !/! --cmd-owner /g"
	
	err=$?
	
	${RM_CMD} -f $tmp >/dev/null 2>&1
	return $err
}

echo -n $"FireHOL: Saving your old firewall to a temporary file:"
fixed_iptables_save >${FIREHOL_SAVED}
if [ $? -eq 0 ]
then
	success $"FireHOL: Saving your old firewall to a temporary file:"
	echo
else
	test -f "${FIREHOL_SAVED}" && ${RM_CMD} -f "${FIREHOL_SAVED}"
	failure $"FireHOL: Saving your old firewall to a temporary file:"
	echo
	exit 1
fi


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

# Place all the statements bellow to the beginning of the final firewall script.
${CAT_CMD} >"${FIREHOL_OUTPUT}" <<EOF
#!/bin/sh

load_kernel_module ip_tables
load_kernel_module ip_conntrack

# Find all tables supported
tables=\`${CAT_CMD} /proc/net/ip_tables_names\`
for t in \${tables}
do
	# Reset/empty this table.
	${IPTABLES_CMD} -t "\${t}" -F >${FIREHOL_OUTPUT}.log 2>&1
	r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t "\${t}" -F
	
	${IPTABLES_CMD} -t "\${t}" -X >${FIREHOL_OUTPUT}.log 2>&1
	r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t "\${t}" -X
	
	${IPTABLES_CMD} -t "\${t}" -Z >${FIREHOL_OUTPUT}.log 2>&1
	r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t "\${t}" -Z
	
	# Find all default chains in this table.
	chains=\`${IPTABLES_CMD} -t "\${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2\`
	
	# If this is the 'filter' table, remember the default chains.
	# This will be used at the end to make it DROP all packets.
	test "\${t}" = "filter" && firehol_filter_chains="\${chains}"
	
	# Set the policy to ACCEPT on all default chains.
	for c in \${chains}
	do
		${IPTABLES_CMD} -t "\${t}" -P "\${c}" ACCEPT >${FIREHOL_OUTPUT}.log 2>&1
		r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t "\${t}" -P "\${c}" ACCEPT
	done
done

${IPTABLES_CMD} -t filter -P INPUT "\${FIREHOL_INPUT_ACTIVATION_POLICY}" >${FIREHOL_OUTPUT}.log 2>&1
r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t filter -P INPUT "\${FIREHOL_INPUT_ACTIVATION_POLICY}"

${IPTABLES_CMD} -t filter -P OUTPUT "\${FIREHOL_OUTPUT_ACTIVATION_POLICY}" >${FIREHOL_OUTPUT}.log 2>&1
r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t filter -P OUTPUT "\${FIREHOL_OUTPUT_ACTIVATION_POLICY}"

${IPTABLES_CMD} -t filter -P FORWARD "\${FIREHOL_FORWARD_ACTIVATION_POLICY}" >${FIREHOL_OUTPUT}.log 2>&1
r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t filter -P FORWARD "\${FIREHOL_FORWARD_ACTIVATION_POLICY}"

# Accept everything in/out the loopback device.
if [ "\${FIREHOL_TRUST_LOOPBACK}" = "1" ]
then
	${IPTABLES_CMD} -A INPUT -i lo -j ACCEPT
	${IPTABLES_CMD} -A OUTPUT -o lo -j ACCEPT
fi

# Drop all invalid packets.
# Netfilter HOWTO suggests to DROP all INVALID packets.
if [ "\${FIREHOL_DROP_INVALID}" = "1" ]
then
	${IPTABLES_CMD} -A INPUT -m state --state INVALID -j DROP
	${IPTABLES_CMD} -A OUTPUT -m state --state INVALID -j DROP
	${IPTABLES_CMD} -A FORWARD -m state --state INVALID -j DROP
fi

EOF

# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

echo -n $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
ret=0

# ------------------------------------------------------------------------------
# Create a small awk script that inserts line numbers in the configuration file
# just before each known directive.
# These line numbers will be used for debugging the configuration script.

${CAT_CMD} >"${FIREHOL_TMP}.awk" <<"EOF"
/^[[:space:]]*blacklist[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*client[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*dnat[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*dscp[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*interface[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*iptables[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*mac[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*mark[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*masquerade[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*nat[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*policy[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*postprocess[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*protection[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*redirect[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*router[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*route[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*server[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*snat[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*tcpmss[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*tos[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*transparent_squid[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
/^[[:space:]]*transparent_proxy[[:space:]]/ { printf "FIREHOL_LINEID=${LINENO} " }
{ print }
EOF

${CAT_CMD} ${FIREHOL_CONFIG} | ${GAWK_CMD} -f "${FIREHOL_TMP}.awk" >${FIREHOL_TMP}
${RM_CMD} -f "${FIREHOL_TMP}.awk"

# ------------------------------------------------------------------------------
# Run the configuration file.

enable -n trap			# Disable the trap buildin shell command.
enable -n exit			# Disable the exit buildin shell command.
source ${FIREHOL_TMP} "$@"	# Run the configuration as a normal script.
FIREHOL_LINEID="FIN"
enable trap			# Enable the trap buildin shell command.
enable exit			# Enable the exit buildin shell command.


close_cmd					|| ret=$[ret + 1]
close_master					|| ret=$[ret + 1]

${CAT_CMD} >>"${FIREHOL_OUTPUT}" <<EOF

# Make it drop everything on table 'filter'.
for c in \${firehol_filter_chains}
do
	${IPTABLES_CMD} -t filter -P "\${c}" DROP >${FIREHOL_OUTPUT}.log 2>&1
	r=\$?; test ! \${r} -eq 0 && runtime_error error \${r} INIT ${IPTABLES_CMD} -t filter -P "\${c}" DROP
done

EOF

if [ ${work_error} -gt 0 -o $ret -gt 0 ]
then
	echo >&2
	echo >&2 "NOTICE: No changes made to your firewall."
	failure $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
	echo
	exit 1
fi

success $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
echo


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

for m in ${FIREHOL_KERNEL_MODULES}
do
	postprocess -ne load_kernel_module $m
done

# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

if [ $FIREHOL_ROUTING -eq 1 ]
then
	postprocess ${SYSCTL_CMD} -w "net.ipv4.ip_forward=1"
fi

# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

if [ ${FIREHOL_DEBUG} -eq 1 ]
then
	${CAT_CMD} ${FIREHOL_OUTPUT}
	
	exit 1
fi


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

echo -n $"FireHOL: Activating new firewall (${FIREHOL_COMMAND_COUNTER} rules):"

source ${FIREHOL_OUTPUT} "$@"

if [ ${work_final_status} -gt 0 ]
then
	failure $"FireHOL: Activating new firewall:"
	echo
	
	# The trap will restore the firewall.
	
	exit 1
fi
success $"FireHOL: Activating new firewall (${FIREHOL_COMMAND_COUNTER} rules):"
echo

if [ ${FIREHOL_TRY} -eq 1 ]
then
	read -p "Keep the firewall? (type 'commit' to accept - 30 seconds timeout) : " -t 30 -e
	ret=$?
	echo
	if [ ! $ret -eq 0 -o ! "${REPLY}" = "commit" ]
	then
		# The trap will restore the firewall.
		
		exit 1
	else
		echo "Successfull activation of FireHOL firewall."
	fi
fi

# Remove the saved firewall, so that the trap will not restore it.
${RM_CMD} -f "${FIREHOL_SAVED}"

# RedHat startup service locking.
if [ -d /var/lock/subsys ]
then
	${TOUCH_CMD} /var/lock/subsys/iptables
	${TOUCH_CMD} /var/lock/subsys/firehol
fi


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

if [ ${FIREHOL_SAVE} -eq 1 ]
then
	if [ -z "${FIREHOL_AUTOSAVE}" ]
	then
		if [ -d "/etc/sysconfig" ]
		then
			# RedHat
			FIREHOL_AUTOSAVE="/etc/sysconfig/iptables"
		elif [ -d "/var/lib/iptables" ]
		then
			if [ -f /etc/conf.d/iptables ]
			then
				# Gentoo
				IPTABLES_SAVE=
				
				. /etc/conf.d/iptables
				FIREHOL_AUTOSAVE="${IPTABLES_SAVE}"
			fi
			
			if [ -z "${FIREHOL_AUTOSAVE}" ]
			then
				# Debian
				FIREHOL_AUTOSAVE="/var/lib/iptables/autosave"
			fi
		else
			error "Cannot find where to save iptables file. Please set FIREHOL_AUTOSAVE."
			echo
			exit 1
		fi
	fi
	
	echo -n $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
	
	fixed_iptables_save >"${FIREHOL_AUTOSAVE}"
	
	if [ ! $? -eq 0 ]
	then
		failure $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
		echo
		exit 1
	fi
	
	success $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
	echo
	exit 0
fi
