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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /sbin/

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Current File : //sbin/ip6tables-apply

#!/bin/bash
# iptables-apply -- a safer way to update iptables remotely
#
# Usage:
#   iptables-apply [-hV] [-t timeout] [-w savefile] {[rulesfile]|-c [runcmd]}
#
# Versions:
#   * 1.0 Copyright 2006 Martin F. Krafft <madduck@madduck.net>
#         Original version
#   * 1.1 Copyright 2010 GW <gw.2010@tnode.com or http://gw.tnode.com/>
#         Added parameter -c (run command)
#         Added parameter -w (save successfully applied rules to file)
#         Major code cleanup
#
# Released under the terms of the Artistic Licence 2.0
#
set -eu

PROGNAME="${0##*/}"
VERSION=1.1


### Default settings

DEF_TIMEOUT=10

MODE=0  # apply rulesfile mode
# MODE=1  # run command mode

case "$PROGNAME" in
	(*6*)
		SAVE=ip6tables-save
		RESTORE=ip6tables-restore
		DEF_RULESFILE="/etc/network/ip6tables.up.rules"
		DEF_SAVEFILE="$DEF_RULESFILE"
		DEF_RUNCMD="/etc/network/ip6tables.up.run"
		;;
	(*)
		SAVE=iptables-save
		RESTORE=iptables-restore
		DEF_RULESFILE="/etc/network/iptables.up.rules"
		DEF_SAVEFILE="$DEF_RULESFILE"
		DEF_RUNCMD="/etc/network/iptables.up.run"
		;;
esac


### Functions

function blurb() {
	cat <<-__EOF__
	$PROGNAME $VERSION -- a safer way to update iptables remotely
	__EOF__
}

function copyright() {
	cat <<-__EOF__
	$PROGNAME has been published under the terms of the Artistic Licence 2.0.

	Original version - Copyright 2006 Martin F. Krafft <madduck@madduck.net>.
	Version 1.1 - Copyright 2010 GW <gw.2010@tnode.com or http://gw.tnode.com/>.
	__EOF__
}

function about() {
	blurb
	echo
	copyright
}

function usage() {
	blurb
	echo
	cat <<-__EOF__
	Usage:
	  $PROGNAME [-hV] [-t timeout] [-w savefile] {[rulesfile]|-c [runcmd]}

	The script will try to apply a new rulesfile (as output by iptables-save,
	read by iptables-restore) or run a command to configure iptables and then
	prompt the user whether the changes are okay. If the new iptables rules cut
	the existing connection, the user will not be able to answer affirmatively.
	In this case, the script rolls back to the previous working iptables rules
	after the timeout expires.

	Successfully applied rules can also be written to savefile and later used
	to roll back to this state. This can be used to implement a store last good
	configuration mechanism when experimenting with an iptables setup script:
	  $PROGNAME -w $DEF_SAVEFILE -c $DEF_RUNCMD

	When called as ip6tables-apply, the script will use ip6tables-save/-restore
	and IPv6 default values instead. Default value for rulesfile is
	'$DEF_RULESFILE'.

	Options:

	-t seconds, --timeout seconds
	  Specify the timeout in seconds (default: $DEF_TIMEOUT).
	-w savefile, --write savefile
	  Specify the savefile where successfully applied rules will be written to
	  (default if empty string is given: $DEF_SAVEFILE).
	-c runcmd, --command runcmd
	  Run command runcmd to configure iptables instead of applying a rulesfile
	  (default: $DEF_RUNCMD).
	-h, --help
	  Display this help text.
	-V, --version
	  Display version information.

	__EOF__
}

function checkcommands() {
	for cmd in "${COMMANDS[@]}"; do
		if ! command -v "$cmd" >/dev/null; then
			echo "Error: needed command not found: $cmd" >&2
			exit 127
		fi
	done
}

function revertrules() {
	echo -n "Reverting to old iptables rules... "
	"$RESTORE" <"$TMPFILE"
	echo "done."
}


### Parsing and checking parameters

TIMEOUT="$DEF_TIMEOUT"
SAVEFILE=""

SHORTOPTS="t:w:chV";
LONGOPTS="timeout:,write:,command,help,version";

OPTS=$(getopt -s bash -o "$SHORTOPTS" -l "$LONGOPTS" -n "$PROGNAME" -- "$@") || exit $?
for opt in $OPTS; do
	case "$opt" in
		(-*)
			unset OPT_STATE
			;;
		(*)
			case "${OPT_STATE:-}" in
				(SET_TIMEOUT) eval TIMEOUT="$opt";;
				(SET_SAVEFILE)
					eval SAVEFILE="$opt"
					[ -z "$SAVEFILE" ] && SAVEFILE="$DEF_SAVEFILE"
					;;
			esac
			;;
	esac

	case "$opt" in
		(-t|--timeout) OPT_STATE="SET_TIMEOUT";;
		(-w|--write) OPT_STATE="SET_SAVEFILE";;
		(-c|--command) MODE=1;;
		(-h|--help) usage >&2; exit 0;;
		(-V|--version) about >&2; exit 0;;
		(--) break;;
	esac
	shift
done

# Validate parameters
if [ "$TIMEOUT" -ge 0 ] 2>/dev/null; then
	TIMEOUT=$((TIMEOUT))
else
	echo "Error: timeout must be a positive number" >&2
	exit 1
fi

if [ -n "$SAVEFILE" ] && [ -e "$SAVEFILE" ] && [ ! -w "$SAVEFILE" ]; then
	echo "Error: savefile not writable: $SAVEFILE" >&2
	exit 8
fi

case "$MODE" in
	(1)
		# Treat parameter as runcmd (run command mode)
		RUNCMD="${1:-$DEF_RUNCMD}"
		if [ ! -x "$RUNCMD" ]; then
			echo "Error: runcmd not executable: $RUNCMD" >&2
			exit 6
		fi

		# Needed commands
		COMMANDS=(mktemp "$SAVE" "$RESTORE" "$RUNCMD")
		checkcommands
		;;
	(*)
		# Treat parameter as rulesfile (apply rulesfile mode)
		RULESFILE="${1:-$DEF_RULESFILE}";
		if [ ! -r "$RULESFILE" ]; then
			echo "Error: rulesfile not readable: $RULESFILE" >&2
			exit 2
		fi

		# Needed commands
		COMMANDS=(mktemp "$SAVE" "$RESTORE")
		checkcommands
		;;
esac


### Begin work

# Store old iptables rules to temporary file
TMPFILE=$(mktemp "/tmp/$PROGNAME-XXXXXXXX")
trap 'rm -f $TMPFILE' EXIT HUP INT QUIT ILL TRAP ABRT BUS \
		      FPE USR1 SEGV USR2 PIPE ALRM TERM

if ! "$SAVE" >"$TMPFILE"; then
	# An error occured
	if ! grep -q ipt /proc/modules 2>/dev/null; then
		echo "Error: iptables support lacking from the kernel" >&2
		exit 3
	else
		echo "Error: unknown error saving old iptables rules: $TMPFILE" >&2
		exit 4
	fi
fi

# Legacy to stop the fail2ban daemon if present
[ -x /etc/init.d/fail2ban ] && /etc/init.d/fail2ban stop

# Configure iptables
case "$MODE" in
	(1)
		# Run command in background and kill it if it times out
		echo -n "Running command '$RUNCMD'... "
		"$RUNCMD" &
		CMD_PID=$!
		( sleep "$TIMEOUT"; kill "$CMD_PID" 2>/dev/null; exit 0 ) &
		if ! wait "$CMD_PID"; then
			echo "failed."
			echo "Error: unknown error running command: $RUNCMD" >&2
			revertrules
			exit 7
		else
			echo "done."
		fi
		;;
	(*)
		# Apply iptables rulesfile
		echo -n "Applying new iptables rules from '$RULESFILE'... "
		if ! "$RESTORE" <"$RULESFILE"; then
			echo "failed."
			echo "Error: unknown error applying new iptables rules: $RULESFILE" >&2
			revertrules
			exit 5
		else
			echo "done."
		fi
		;;
esac

# Prompt user for confirmation
echo -n "Can you establish NEW connections to the machine? (y/N) "

read -r -n1 -t "$TIMEOUT" ret 2>&1 || :
case "${ret:-}" in
	(y*|Y*)
		# Success
		echo

		if [ -n "$SAVEFILE" ]; then
			# Write successfully applied rules to the savefile
			echo "Writing successfully applied rules to '$SAVEFILE'..."
			if ! "$SAVE" >"$SAVEFILE"; then
				echo "Error: unknown error writing successfully applied rules: $SAVEFILE" >&2
				exit 9
			fi
		fi

		echo "... then my job is done. See you next time."
		;;
	(*)
		# Failed
		echo
		if [ -z "${ret:-}" ]; then
			echo "Timeout! Something happened (or did not). Better play it safe..."
		else
			echo "No affirmative response! Better play it safe..."
		fi
		revertrules
		exit 255
		;;
esac

# Legacy to start the fail2ban daemon again
[ -x /etc/init.d/fail2ban ] && /etc/init.d/fail2ban start

exit 0

# vim:noet:sw=8

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