Package: iptables
Version: 1.4.6-2
Severity: wishlist
Tags: sid lenny patch upstream squeeze experimental
Hey,
I have written two new enhancements for iptables-apply, fixed some bugs
and also done some code cleaning. The attached large patch is against the
latest iptables upstream release 1.4.7 (the code for iptables-apply also hasn't
changed for quite a while) and because it is so large I increased the version
to 1.1.
New usage (compatible with the old one):
iptables-apply [-hV] [-t timeout] [-w savefile] {[rulesfile]|-c [runcmd]}
New options:
-w savefile, --write savefile
Specify the savefile where successfully applied rules will be written to
(default if empty string is given: /etc/network/iptables.up.rules).
-c runcmd, --command runcmd
Run command runcmd to configure iptables instead of applying a rulesfile
(default: /etc/network/iptables.up.run).
I hope it is understandable. For questions look into the new man page
(or run new 'iptables-apply -h') or just ask.
This two options allow you to implement a store last good configuration
mechanism (in case your custom iptables setup script sometimes breaks),
just by using it like:
iptables-apply -w /etc/network/iptables.up.rules -c
/etc/network/iptables.up.run
This is also extremely useful in combination with a if-pre-up script (will send
bug
report soon) and allows you to modify your iptables setup script and be sure
that only the last working iptables rules will get restored after reboot.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (900, 'testing'), (800, 'testing-proposed-updates'), (600,
'unstable'), (500, 'lenny'), (500, 'karmic'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.32-3-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages iptables depends on:
ii libc6 2.10.2-6 Embedded GNU C Library: Shared lib
iptables recommends no packages.
iptables suggests no packages.
diff -ru orig//iptables-apply new//iptables-apply
--- orig//iptables-apply 2010-03-01 15:11:28.000000000 +0100
+++ new//iptables-apply 2010-05-10 01:56:31.090844575 +0200
@@ -1,172 +1,293 @@
#!/bin/bash
-#
# iptables-apply -- a safer way to update iptables remotely
#
-# Copyright © Martin F. Krafft <madd...@madduck.net>
+# Usage:
+# iptables-apply [-hV] [-t timeout] [-w savefile] {[rulesfile]|-c [runcmd]}
+#
+# Versions:
+# * 1.0 Copyright 2006 Martin F. Krafft <madd...@madduck.net>
+# Original version
+# * 1.1 Copyright 2010 GW <gw.2...@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="${0##*/}";
-VERSION=1.0
+PROGNAME="${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
+
-TIMEOUT=10
-DEFAULT_FILE=/etc/network/iptables
+### Functions
-function blurb()
-{
- cat <<-_eof
+function blurb() {
+ cat <<-__EOF__
$PROGNAME $VERSION -- a safer way to update iptables remotely
- _eof
+ __EOF__
}
-function copyright()
-{
- cat <<-_eof
- $PROGNAME is C Martin F. Krafft <madd...@madduck.net>.
-
- The program has been published under the terms of the Artistic Licence 2.0
- _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 <madd...@madduck.net>.
+ Version 1.1 - Copyright 2010 GW <gw.2...@tnode.com or http://gw.tnode.com/>.
+ __EOF__
}
-function about()
-{
+function about() {
blurb
echo
copyright
}
-function usage()
-{
- cat <<-_eof
- Usage: $PROGNAME [options] ruleset
-
- The script will try to apply a new ruleset (as output by iptables-save/read
- by iptables-restore) to iptables, then prompt the user whether the changes
- are okay. If the new ruleset cut the existing connection, the user will not
- be able to answer affirmatively. In this case, the script rolls back to the
- previous ruleset.
-
- The following options may be specified, using standard conventions:
-
- -t | --timeout Specify the timeout in seconds (default: $TIMEOUT)
- -V | --version Display version information
- -h | --help Display this help text
- _eof
+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: $DEF_RUNCMD).
+ -h, --help
+ Display this help text.
+ -V, --version
+ Display version information.
+
+ __EOF__
}
-SHORTOPTS="t:Vh";
-LONGOPTS="timeout:,version,help";
+function checkcommands() {
+ for cmd in "${comman...@]}"; 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;;
+ (-*)
+ unset OPT_STATE
+ ;;
(*)
case "${OPT_STATE:-}" in
- (SET_TIMEOUT)
- eval TIMEOUT=$opt
- case "$TIMEOUT" in
- ([0-9]*) :;;
- (*)
- echo "E: non-numeric timeout value." >&2
- exit 1
- ;;
- esac
+ (SET_TIMEOUT) eval TIMEOUT=$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;;
- (-t|--timeout) OPT_STATE=SET_TIMEOUT;;
(--) break;;
esac
shift
done
-FILE="${1:-$DEFAULT_FILE}";
-
-if [[ -z "$FILE" ]]; then
- echo "E: missing file argument." >&2
+# Validate parameters
+if [ "$TIMEOUT" -ge 0 ] 2>/dev/null; then
+ TIMEOUT=$(($TIMEOUT))
+else
+ echo "Error: timeout must be a positive number" >&2
exit 1
fi
-if [[ ! -r "$FILE" ]]; then
- echo "E: cannot read $FILE" >&2
- exit 2
+if [ -n "$SAVEFILE" -a -e "$SAVEFILE" -a ! -w "$SAVEFILE" ]; then
+ echo "Error: savefile not writable: $SAVEFILE" >&2
+ exit 8
fi
-case "${0##*/}" in
- (*6*)
- SAVE=ip6tables-save
- RESTORE=ip6tables-restore
+case "$MODE" in
+ (1)
+ # Treat parameter as runcmd (run command mode)
+ RUNCMD="${1:-$DEF_RUNCMD}"
+ if [ ! -x "$RUNCMD" ]; then
+ echo "Error: runcmd not executable: $RUNCMD" >&2
+ exit 6
+ fi
+
+ # Needed commands
+ COMMANDS=(tempfile "$SAVE" "$RESTORE" "$RUNCMD")
+ checkcommands
;;
(*)
- SAVE=iptables-save
- RESTORE=iptables-restore
+ # Treat parameter as rulesfile (apply rulesfile mode)
+ RULESFILE="${1:-$DEF_RULESFILE}";
+ if [ ! -r "$RULESFILE" ]; then
+ echo "Error: rulesfile not readable: $RULESFILE" >&2
+ exit 2
+ fi
+
+ # Needed commands
+ COMMANDS=(tempfile "$SAVE" "$RESTORE")
+ checkcommands
;;
esac
-COMMANDS=(tempfile "$SAVE" "$RESTORE")
-
-for cmd in "${comman...@]}"; do
- if ! command -v $cmd >/dev/null; then
- echo "E: command not found: $cmd" >&2
- exit 127
- fi
-done
-umask 0700
+### Begin work
-TMPFILE=$(tempfile -p iptap)
+# Store old iptables rules to temporary file
+TMPFILE=`tempfile -m 0000 -p iptap`
trap "rm -f $TMPFILE" EXIT 1 2 3 4 5 6 7 8 10 11 12 13 14 15
if ! "$SAVE" >"$TMPFILE"; then
+ # An error occured
if ! grep -q ipt /proc/modules 2>/dev/null; then
- echo "E: iptables support lacking from the kernel." >&2
+ echo "Error: iptables support lacking from the kernel" >&2
exit 3
else
- echo "E: unknown error saving current iptables ruleset." >&2
+ echo "Error: unknown error saving old iptables rules: $TMPFILE" >&2
exit 4
fi
fi
+# Legacy to stop the fail2ban daemon if present
[ -x /etc/init.d/fail2ban ] && /etc/init.d/fail2ban stop
-echo -n "Applying new ruleset... "
-if ! "$RESTORE" <"$FILE"; then
- echo "failed."
- echo "E: unknown error applying new iptables ruleset." >&2
- exit 5
-else
- echo done.
-fi
+# Configure iptables
+case "$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 "$CMD_PID" 2>/dev/null; exit 0 ) &
+ CMDTIMEOUT_PID=$!
+ 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: $RULESFILE" >&2
+ revertrules
+ exit 5
+ else
+ echo "done."
+ fi
+ ;;
+esac
+# Prompt user for confirmation
echo -n "Can you establish NEW connections to the machine? (y/N) "
-read -n1 -t "${TIMEOUT:-15}" ret 2>&1 || :
+read -n1 -t "$TIMEOUT" ret 2>&1 || :
case "${ret:-}" in
(y*|Y*)
+ # Success
echo
- echo ... then my job is done. See you next time.
+
+ if [ ! -z "$SAVEFILE" ]; then
+ # Write successfully applied rules to the savefile
+ echo "Writing successfully applied rules to '$SAVEFILE'..."
+ if ! "$SAVE" >"$SAVEFILE"; then
+ echo "Error: unknown error writing successfully applied rules: $SAVEFILE" >&2
+ exit 9
+ fi
+ fi
+
+ echo "... then my job is done. See you next time."
;;
(*)
- if [[ -z "${ret:-}" ]]; then
- echo "apparently not..."
+ # Failed
+ echo
+ if [ -z "${ret:-}" ]; then
+ echo "Timeout! Something happened (or did not). Better play it safe..."
else
- echo
+ echo "No affirmative response! Better play it safe..."
fi
- echo "Timeout. Something happened (or did not). Better play it safe..."
- echo -n "Reverting to old ruleset... "
- "$RESTORE" <"$TMPFILE";
- echo done.
+ revertrules
exit 255
;;
esac
+# Legacy to start the fail2ban daemon again
[ -x /etc/init.d/fail2ban ] && /etc/init.d/fail2ban start
exit 0
diff -ru orig//iptables-apply.8 new//iptables-apply.8
--- orig//iptables-apply.8 2010-03-01 15:11:28.000000000 +0100
+++ new//iptables-apply.8 2010-05-10 01:56:17.938859019 +0200
@@ -1,30 +1,44 @@
.\" Title: iptables-apply
-.\" Author: Martin F. Krafft
-.\" Date: Jun 04, 2006
+.\" Author: Martin F. Krafft, GW
+.\" Date: May 10, 2010
.\"
-.TH iptables\-apply 8 2006-06-04
+.TH iptables\-apply 8 2010-05-10
.\" disable hyphenation
.nh
.SH NAME
iptables-apply \- a safer way to update iptables remotely
.SH SYNOPSIS
-\fBiptables\-apply\fP [\-\fBhV\fP] [\fB-t\fP \fItimeout\fP] \fIruleset\-file\fP
+\fBiptables\-apply\fP [\-\fBhV\fP] [\fB-t\fP \fItimeout\fP] [\fB-w\fP \fIsavefile\fP] {[\fIrulesfile]|-c [runcmd]}\fP
.SH "DESCRIPTION"
.PP
-iptables\-apply will try to apply a new ruleset (as output by
-iptables\-save/read by iptables\-restore) to iptables, then prompt the
-user whether the changes are okay. If the new ruleset cut the existing
-connection, the user will not be able to answer affirmatively. In this
-case, the script rolls back to the previous ruleset after the timeout
-expired. The timeout can be set with \fB\-t\fP.
+iptables\-apply 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.
+.PP
+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:
+iptables-apply -w /etc/network/iptables.up.rules -c /etc/network/iptables.up.run
.PP
When called as ip6tables\-apply, the script will use
-ip6tables\-save/\-restore instead.
+ip6tables\-save/\-restore and IPv6 default values instead. Default
+value for rulesfile is '/etc/network/iptables.up.rules'.
.SH OPTIONS
.TP
\fB\-t\fP \fIseconds\fR, \fB\-\-timeout\fP \fIseconds\fR
-Sets the timeout after which the script will roll back to the previous
-ruleset.
+Sets the timeout in seconds after which the script will roll back
+to the previous ruleset (default: 10).
+.TP
+\fB\-w\fP \fIsavefile\fR, \fB\-\-write\fP \fIsavefile\fR
+Specify the savefile where successfully applied rules will be written to
+(default if empty string is given: /etc/network/iptables.up.rules).
+.TP
+\fB\-c\fP \fIruncmd\fR, \fB\-\-command\fP \fIruncmd\fR
+Run command runcmd to configure iptables instead of applying a rulesfile
+(default: /etc/network/iptables.up.run).
.TP
\fB\-h\fP, \fB\-\-help\fP
Display usage information.
@@ -36,9 +50,11 @@
\fBiptables-restore\fP(8), \fBiptables-save\fP(8), \fBiptables\fR(8).
.SH LEGALESE
.PP
-iptables\-apply is copyright by Martin F. Krafft.
+Original iptables-apply - Copyright 2006 Martin F. Krafft <madd...@madduck.net>.
+Version 1.1 - Copyright 2010 GW <gw.2...@tnode.com or http://gw.tnode.com/>.
.PP
-This manual page was written by Martin F. Krafft <madd...@madduck.net>
+This manual page was written by Martin F. Krafft <madd...@madduck.net> and
+extended by GW <gw.2...@tnode.com or http://gw.tnode.com/>.
.PP
Permission is granted to copy, distribute and/or modify this document
under the terms of the Artistic License 2.0.
#!/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 <madd...@madduck.net>
# Original version
# * 1.1 Copyright 2010 GW <gw.2...@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 <madd...@madduck.net>.
Version 1.1 - Copyright 2010 GW <gw.2...@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: $DEF_RUNCMD).
-h, --help
Display this help text.
-V, --version
Display version information.
__EOF__
}
function checkcommands() {
for cmd in "${comman...@]}"; 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" -a -e "$SAVEFILE" -a ! -w "$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: $RUNCMD" >&2
exit 6
fi
# Needed commands
COMMANDS=(tempfile "$SAVE" "$RESTORE" "$RUNCMD")
checkcommands
;;
(*)
# Treat parameter as rulesfile (apply rulesfile mode)
RULESFILE="${1:-$DEF_RULESFILE}";
if [ ! -r "$RULESFILE" ]; then
echo "Error: rulesfile not readable: $RULESFILE" >&2
exit 2
fi
# Needed commands
COMMANDS=(tempfile "$SAVE" "$RESTORE")
checkcommands
;;
esac
### Begin work
# Store old iptables rules to temporary file
TMPFILE=`tempfile -m 0000 -p iptap`
trap "rm -f $TMPFILE" EXIT 1 2 3 4 5 6 7 8 10 11 12 13 14 15
if ! "$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 "$CMD_PID" 2>/dev/null; exit 0 ) &
CMDTIMEOUT_PID=$!
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: $RULESFILE" >&2
revertrules
exit 5
else
echo "done."
fi
;;
esac
# Prompt user for confirmation
echo -n "Can you establish NEW connections to the machine? (y/N) "
read -n1 -t "$TIMEOUT" ret 2>&1 || :
case "${ret:-}" in
(y*|Y*)
# Success
echo
if [ ! -z "$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
..\" Title: iptables-apply
..\" Author: Martin F. Krafft, GW
..\" Date: May 10, 2010
..\"
..TH iptables\-apply 8 2010-05-10
..\" disable hyphenation
..nh
..SH NAME
iptables-apply \- a safer way to update iptables remotely
..SH SYNOPSIS
\fBiptables\-apply\fP [\-\fBhV\fP] [\fB-t\fP \fItimeout\fP] [\fB-w\fP \fIsavefile\fP] {[\fIrulesfile]|-c [runcmd]}\fP
..SH "DESCRIPTION"
..PP
iptables\-apply 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.
..PP
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:
iptables-apply -w /etc/network/iptables.up.rules -c /etc/network/iptables.up.run
..PP
When called as ip6tables\-apply, the script will use
ip6tables\-save/\-restore and IPv6 default values instead. Default
value for rulesfile is '/etc/network/iptables.up.rules'.
..SH OPTIONS
..TP
\fB\-t\fP \fIseconds\fR, \fB\-\-timeout\fP \fIseconds\fR
Sets the timeout in seconds after which the script will roll back
to the previous ruleset (default: 10).
..TP
\fB\-w\fP \fIsavefile\fR, \fB\-\-write\fP \fIsavefile\fR
Specify the savefile where successfully applied rules will be written to
(default if empty string is given: /etc/network/iptables.up.rules).
..TP
\fB\-c\fP \fIruncmd\fR, \fB\-\-command\fP \fIruncmd\fR
Run command runcmd to configure iptables instead of applying a rulesfile
(default: /etc/network/iptables.up.run).
..TP
\fB\-h\fP, \fB\-\-help\fP
Display usage information.
..TP
\fB\-V\fP, \fB\-\-version\fP
Display version information.
..SH "SEE ALSO"
..PP
\fBiptables-restore\fP(8), \fBiptables-save\fP(8), \fBiptables\fR(8).
..SH LEGALESE
..PP
Original iptables-apply - Copyright 2006 Martin F. Krafft <madd...@madduck.net>.
Version 1.1 - Copyright 2010 GW <gw.2...@tnode.com or http://gw.tnode.com/>.
..PP
This manual page was written by Martin F. Krafft <madd...@madduck.net> and
extended by GW <gw.2...@tnode.com or http://gw.tnode.com/>.
..PP
Permission is granted to copy, distribute and/or modify this document
under the terms of the Artistic License 2.0.
