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#!/usr/bin/perl
#Copyright (c) 2009 Eucalyptus Systems, Inc.
#
#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, only version 3 of the License.
#
#This file is distributed in the hope that it will be useful, but WITHOUT
#ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
#for more details.
#
#You should have received a copy of the GNU General Public License along
#with this program. If not, see <http://www.gnu.org/licenses/>.
#
#Please contact Eucalyptus Systems, Inc., 130 Castilian
#Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
#if you need additional information or have any questions.
#
#This file may incorporate work covered under the following copyright and
#permission notice:
#
# Software License Agreement (BSD License)
#
# Copyright (c) 2008, Regents of the University of California
#
#
# Redistribution and use of this software in source and binary forms, with
# or without modification, are permitted provided that the following
# conditions are met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USERS OF
# THIS SOFTWARE ACKNOWLEDGE THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE
# LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
# SOFTWARE, AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
# IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
# BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, WHICH IN
# THE REGENTS’ DISCRETION MAY INCLUDE, WITHOUT LIMITATION, REPLACEMENT
# OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO IDENTIFIED, OR
# WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT NEEDED TO COMPLY WITH
# ANY SUCH LICENSES OR RIGHTS.
#
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
$ENV{'PATH'}='/bin:/usr/bin:/sbin:/usr/sbin/';
$table = shift @ARGV;
if ($table =~ /^([ &:#-\@\w.]+)$/) {
$table = $1; #data is now untainted
} else {
exit(1);
}
$rulefile = shift @ARGV;
if ($rulefile =~ /^([ &:#-\@\w.]+)$/) {
$rulefile = $1; #data is now untainted
} else {
exit(1);
}
if (!$table || !$rulefile || !($table eq "filter" || $table eq "nat") || $rulefile eq "" || !-f $rulefile) {exit 1;}
@workingfiles = ("$rulefile.orig", "$rulefile.new");
open my $fh, '-|' or exec 'iptables-save', ("-t", "$table") or dodie ("iptables-save failed: $!\n");
open(OFH, ">$rulefile.orig") or dodie ("cannot open $rulefile.orig");
$outbuf = "";
while(<$fh>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
print OFH "$line\n";
}
close($fh) || dodie ("iptables-save failed\n");
close(OFH);
$added=0;
$outbuf = "";
open(FH, "$rulefile.orig");
while(<FH>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
if ($line eq "COMMIT") {
# time to load the input rules
open (RFH, "$rulefile");
while(<RFH>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
if ($line ne "" && !$rulehash{$line}) {
$buf .= "$line\n";
$rulehash{$line} = 1;
$added=1;
}
}
close(RFH);
}
if ($line ne "" && !$rulehash{$line}) {
$buf .= "$line\n";
$rulehash{$line} = 1;
}
}
close(FH);
if (!$added) {
doexit(0);
}
open (OFH, ">$rulefile.new");
print OFH "$buf\n";
close(OFH);
if (!-f "$rulefile.new") {
dodie("cannot find $rulefile.new");
}
open my $fh, '|-' or exec 'iptables-restore' or dodie( "iptables-restore failed: $!\n");
open(IFH, "$rulefile.new") or dodie( "cannot open $rulefile.new");
while(<IFH>) {
print $fh "$_";
}
close($fh) || dodie( "iptables-restore failed\n");
close(IFH);
doexit(0);
sub doexit {
$ret = shift @_;
$msg = shift @_;
if ($msg) {
print STDERR "$msg\n";
}
for ($i=0; $i<@workingfiles; $i++) {
if ( -f "$workingfiles[$i]" ) {
unlink("$workingfiles[$i]");
}
}
exit($ret);
}
sub dodie {
$msg = shift @_;
doexit(1, "$msg");
}
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