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#!/usr/bin/perl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program 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.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
# You can also obtain it by writing to the Free Software Foundation,
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Stig Thormodsrud
# Date: April 2009
# Description: Script to setup login banner
#
# **** End License ****
#
use lib '/opt/vyatta/share/perl5/';
use Vyatta::Config;
use Getopt::Long;
use File::Copy;
use File::Compare;
use strict;
use warnings;
my $prelogin_file = '/etc/issue';
my $prelogin_net_file = '/etc/issue.net';
my $postlogin_file = '/etc/motd';
sub save_orig_file {
my $file = shift;
move($file, "$file.old") if ! -e "$file.old";
return;
}
sub restore_orig_file {
my $file = shift;
move("$file.old", $file)if -e "$file.old";
return;
}
sub is_same_as_file {
my ($file, $value) = @_;
return if ! -e $file;
my $mem_file = ' ';
open my $MF, '+<', \$mem_file or die "couldn't open memfile $!\n";
print $MF $value;
seek($MF, 0, 0);
my $rc = compare($file, $MF);
return 1 if $rc == 0;
return;
}
sub write_file_value {
my ($file, $value) = @_;
# Avoid unnecessary writes. At boot the file will be the
# regenerated with the same content.
return if is_same_as_file($file, $value);
open my $F, '>', $file or die "Error: opening $file [$!]";
print $F "$value";
close $F;
}
sub get_banner {
my $banner_type = shift;
my $config = new Vyatta::Config;
$config->setLevel('system login banner');
my $text = $config->returnValue($banner_type);
$text =~ s|\\n|\n|g;
$text =~ s|\\t|\t|g;
return $text;
}
sub add_prelogin {
save_orig_file($prelogin_file);
save_orig_file($prelogin_net_file);
my $text = get_banner('pre-login');
write_file_value($prelogin_file, $text);
write_file_value($prelogin_net_file, $text);
return;
}
sub add_postlogin {
save_orig_file($postlogin_file);
my $text = get_banner('post-login');
write_file_value($postlogin_file, $text);
return;
}
#
# main
#
my ($action, $banner_type);
GetOptions("action=s" => \$action,
"banner-type=s" => \$banner_type,
);
die "Error: no action" if ! defined $action;
die "Error: no banner-type" if ! defined $banner_type;
if ($action eq 'update') {
if ($banner_type eq 'pre-login') {
add_prelogin();
exit 0;
}
if ($banner_type eq 'post-login') {
add_postlogin();
exit 0;
}
}
if ($action eq 'delete') {
if ($banner_type eq 'pre-login') {
restore_orig_file($prelogin_file);
restore_orig_file($prelogin_net_file);
exit 0;
}
if ($banner_type eq 'post-login') {
restore_orig_file($postlogin_file);
exit 0;
}
}
exit 1;
#end of file
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