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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
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