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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/check_immutable_files Copyright 2022 cPanel, L.L.C.
# All rights reserved.
# copyright@cpanel.net http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited
#
# This is the authorative code used to sync /usr/local/cpanel
# Accept no imitators.
#
use strict;
use warnings;
use Cpanel::Usage ();
use Cpanel::SafeRun::Errors ();
my $frequency = 10;
my $force = 0;
my $is_help = 0;
Cpanel::Usage::wrap_options(
\@ARGV,
\&usage,
{
'frequency' => \$frequency,
'force' => \$force,
'help' => \$is_help,
}
);
my $immutable_file_list = '/var/cpanel/immutable_files';
check_last_usage($immutable_file_list); # Will exit if not necessary to proceed.
# Instead of just testing the exit code returned the script find-immutable-files
# execution, checking for a "{number} immutable files have been found" output line
# coming back from the script allows us to differentiate two distinct cases of
# non-zero exit code, namely: 1) The script ran and actual immutable files were
# found; 2) the script could not run at all for some reason. At some point we might
# decide that the second of those two is not a reason to hold up execution of the
# update script that calls this script.
my $script = '/usr/local/cpanel/bin/find-immutable-files';
my $n_found;
( my $myname = $0 ) =~ s{.*/}{};
my $consequences = "Script '$myname' will terminate now with non-zero exit code.";
die("\"$script\" is not executable. $consequences") if ( !-x $script );
my $output = Cpanel::SafeRun::Errors::saferunallerrors( 'nice', '-n', '20', $script, $frequency );
die("Unable to run script \"$script\". $consequences") if ( !defined $output );
if ( $output !~ /\b0 immutable files have been found\b/ ) {
my $foundmatch = qr/\bfound\s+the\s+following\s+files\s+marked\s+as\s+immutable\s+/;
$output =~ /$foundmatch/
or die "Script $script could not be run or returned incomplete information. $consequences\n";
if (
$output =~ m{
${foundmatch}in\s+the\s+[^\n]*location:\s*\n\n
(
(
[^\n]+\n
)+
)
\n
}xms
) {
$n_found = $1 =~ y/\n//;
}
defined $n_found
or die "Script $script returned incomplete information. $consequences\n";
die "$n_found immutable files were found on the system. $consequences\n";
}
print "OK: No immutable files were found on the system.\n";
exit 0;
sub check_last_usage {
my $immutable_file_list = shift or die;
return if ($force); # --force passed on command line.
return if ( !-e $immutable_file_list ); # Check has never run.
return if ( -s $immutable_file_list ); # Re-run if files were found on last run.
# Run if the previous check was less than $frequency days ago
my $immutable_last_run_days = -M $immutable_file_list;
return if ( $immutable_last_run_days > $frequency );
my $interval = round($immutable_last_run_days);
if ( $interval >= round($frequency) ) {
# message to user should not say "was last run approx. 10 days ago which is less than 10 days"
$interval = round( $frequency - 1 );
}
if ( $interval <= 0 ) {
# message to user should not say "was last run approx. 0 days ago"
$interval = 'less than one day ago';
}
elsif ( $interval == 1 ) {
$interval = 'approximately one day ago';
}
else {
$interval = "approximately $interval days ago";
}
print "Not testing for immutable files, because the test was last run $interval (less than $frequency days)\n";
exit 0;
}
sub round {
# We could use Math::Round::round(), but tests show that loading that module
# would consume some 900K memory. Hence the following homegrown solution instead.
my $num = shift;
return int( .5 + $num );
}
sub usage {
print qq{Usage: $0 [options]};
print qq{
Options:
--frequency=N Do not perform check if we have already done so in past N days; default = 10
--force Force a check for immutable files, regardless of how recently it was last done
--help Brief help message
};
}
__END__
=head1 NAME
check_immutable_files - checks for immutable files in /usr/local/cpanel, if this has not already been done recently
=head1 USAGE
# Normally called by maintenance with no flags.
# file being used to log all other update-related proceses.
/scripts/check_immutable_files
=head1 DESCRIPTION
When used standalone, you should probably use --verbose, otherwise
it won't appear to do anything.
Will not do anything if it has been invoked in the past 10 days (or
whatever number of days are indicated with the --frequency option),
unless called with --force. --frequency=0 is functionally
equivalent to --force, unless you do something unusual like
changing file mod times into the future.
If the check is run, the exit status will indicate whether immutable
files were found.
--frequency=N Do not perform check if we have already done so in past N days; default = 10.
--force Force a check for immutable files, regardless of how recently it was last done.
--help Print a brief help message