FM / cron

/usr/share/usermin/cron

Name	Size	Mode	Actions
help/	-	0755	rm
images/	-	0755	rm
lang/	-	0755	rm
CHANGELOG	685	0644	edit dl rm
config-aix	506	0644	edit dl rm
config-cobalt-linux	544	0644	edit dl rm
config-coherent-linux	544	0644	edit dl rm
config-corel-linux	562	0644	edit dl rm
config-debian-linux	526	0644	edit dl rm
config-debian-linux-2.1-ALL	580	0644	edit dl rm
config-freebsd	497	0644	edit dl rm
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config-irix	513	0644	edit dl rm
config-macos	497	0644	edit dl rm
config-macos-9.2-ALL	501	0644	edit dl rm
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config-msc-linux	544	0644	edit dl rm
config-netbsd	497	0644	edit dl rm
config-open-linux	586	0644	edit dl rm
config-openbsd	497	0644	edit dl rm
config-openserver	497	0644	edit dl rm
config-openSUSE-Linux-15.0-ALL	541	0644	edit dl rm
config-osf1	523	0644	edit dl rm
config-pardus-linux	525	0644	edit dl rm
config-redhat-linux	560	0644	edit dl rm
config-slackware-linux	450	0644	edit dl rm
config-sol-linux	541	0644	edit dl rm
config-solaris	484	0644	edit dl rm
config-solaris-11-ALL	486	0644	edit dl rm
config-suse-linux	523	0644	edit dl rm
config-suse-linux-7.0-8.0	529	0644	edit dl rm
config-suse-linux-8.2-ALL	541	0644	edit dl rm
config-syno-linux	293	0644	edit dl rm
config-trustix-linux	554	0644	edit dl rm
config-turbo-linux	544	0644	edit dl rm
config-united-linux	541	0644	edit dl rm
config-unixware	484	0644	edit dl rm
config.info	542	0644	edit dl rm
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config.info.cs	1608	0644	edit dl rm
config.info.de	327	0644	edit dl rm
config.info.el	1057	0644	edit dl rm
config.info.es	1567	0644	edit dl rm
config.info.fr	1559	0644	edit dl rm
config.info.nl	1648	0644	edit dl rm
config.info.no	570	0644	edit dl rm
config.info.pl	1771	0644	edit dl rm
config.info.sv	792	0644	edit dl rm
config.info.tr	1048	0644	edit dl rm
config.info.zh	687	0644	edit dl rm
config.info.zh_TW	852	0644	edit dl rm
cron-lib.pl	46664	0755	edit dl rm
cron_editor.pl	601	0755	edit dl rm
defaultacl	84	0644	edit dl rm
defaultuconfig	40	0644	edit dl rm
delete_cron.cgi	409	0755	edit dl rm
delete_env.cgi	399	0755	edit dl rm
delete_jobs.cgi	1136	0755	edit dl rm
edit_cron.cgi	4353	0755	edit dl rm
edit_env.cgi	1914	0755	edit dl rm
exec_cron.cgi	2148	0755	edit dl rm
feedback_files.pl	319	0755	edit dl rm
index.cgi	9274	0755	edit dl rm
module.info	119	0644	edit dl rm
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module.info.he	0	0644	edit dl rm
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module.info.vi.auto	139	0644	edit dl rm
module.info.zh	0	0644	edit dl rm
module.info.zh.auto	93	0644	edit dl rm
module.info.zh_TW	0	0644	edit dl rm
module.info.zh_TW.auto	102	0644	edit dl rm
move.cgi	1203	0755	edit dl rm
range.pl	737	0755	edit dl rm
save_cron.cgi	2924	0755	edit dl rm
save_env.cgi	2000	0755	edit dl rm
uconfig.info	135	0644	edit dl rm
uconfig.info.ca	125	0755	edit dl rm
uconfig.info.cs	105	0644	edit dl rm
uconfig.info.de	145	0644	edit dl rm
uconfig.info.fr	122	0644	edit dl rm
uconfig.info.nl	165	0644	edit dl rm
uconfig.info.no	158	0644	edit dl rm
uconfig.info.pl	187	0644	edit dl rm

Edit: /usr/share/usermin/cron/cron-lib.pl (46664B)

=head1 cron-lib.pl

Functions for listing, creating and managing Unix users' cron jobs.

foreign_require("cron", "cron-lib.pl");
 @jobs = cron::list_cron_jobs();
 $job = { 'user' => 'root',
          'active' => 1,
          'command' => 'ls -l >/dev/null',
          'special' => 'hourly' };
 cron::create_cron_job($job);

=cut

BEGIN { push(@INC, ".."); };
use WebminCore;
&init_config();
%access = &get_module_acl();
$env_support = $config{'vixie_cron'};
if ($module_info{'usermin'}) {
	$single_user = $remote_user;
	&switch_to_remote_user();
	&create_user_config_dirs();
	$range_cmd = "$user_module_config_directory/range.pl";
	$hourly_only = 0;
	}
else {
	$range_cmd = "$module_config_directory/range.pl";
	$hourly_only = $access{'hourly'} == 0 ? 0 :
		       $access{'hourly'} == 1 ? 1 :
			$config{'hourly_only'};
	}
$temp_delete_cmd = "$module_config_directory/tempdelete.pl";
$cron_temp_file = &transname();
use Time::Local;

=head2 list_cron_jobs

Returns a lists of structures of all cron jobs, each of which is a hash
reference with the following keys :

=item user - Unix user the job runs as.

=item command - The full command to be run.

=item active - Set to 0 if the job is commented out, 1 if active.

=item mins - Minute or comma-separated list of minutes the job will run, or * for all.

=item hours - Hour or comma-separated list of hours the job will run, or * for all.

=item days - Day or comma-separated list of days of the month the job will run, or * for all.

=item month - Month number or comma-separated list of months (started from 1) the job will run, or * for all.

=item weekday - Day of the week or comma-separated list of days (where 0 is sunday) the job will run, or * for all

=cut
sub list_cron_jobs
{
local (@rv, $lnum, $f);
if (scalar(@cron_jobs_cache)) {
	return @cron_jobs_cache;
	}

# read the master crontab file
if ($config{'system_crontab'}) {
	$lnum = 0;
	&open_readfile(TAB, $config{'system_crontab'});
	while(<TAB>) {
		# Comment line in Fedora 13
		next if (/^#+\s+\*\s+\*\s+\*\s+\*\s+\*\s+(user-name\s+)?command\s+to\s+be\s+executed/);

if (/^(#+)?[\s\&]*(-)?\s*([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+(([0-9\-\*\/]+|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|,)+)\s+(([0-9\-\*\/]+|sun|mon|tue|wed|thu|fri|sat|,)+)\s+(\S+)\s+(.*)/i) {
			# A normal h m s d w time
			push(@rv, { 'file' => $config{'system_crontab'},
				    'line' => $lnum,
				    'type' => 1,
				    'nolog' => $2,
				    'active' => !$1,
				    'mins' => $3, 'hours' => $4,
				    'days' => $5, 'months' => $6,
				    'weekdays' => $8, 'user' => $10,
				    'command' => $11,
				    'index' => scalar(@rv) });
			if ($rv[$#rv]->{'user'} =~ /^\//) {
				# missing the user, as in redhat 7 !
				$rv[$#rv]->{'command'} = $rv[$#rv]->{'user'}.
					' '.$rv[$#rv]->{'command'};
				$rv[$#rv]->{'user'} = 'root';
				}
			&fix_names($rv[$#rv]);
			}
		elsif (/^(#+)?\s*@([a-z]+)\s+(\S+)\s+(.*)/i) {
			# An @ time
			push(@rv, { 'file' => $config{'system_crontab'},
				    'line' => $lnum,
				    'type' => 1,
				    'active' => !$1,
				    'special' => $2,
				    'user' => $3,
				    'command' => $4,
				    'index' => scalar(@rv) });
			}
		$lnum++;
		}
	close(TAB);
	}

# read package-specific cron files
opendir(DIR, &translate_filename($config{'cronfiles_dir'}));
my @files = sort { $a cmp $b } readdir(DIR);
closedir(DIR);
foreach my $f (@files) {
	next if ($f =~ /^\./);
	$lnum = 0;
	&open_readfile(TAB, "$config{'cronfiles_dir'}/$f");
	while(<TAB>) {
		if (/^(#+)?[\s\&]*(-)?\s*([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+(([0-9\-\*\/]+|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|,)+)\s+(([0-9\-\*\/]+|sun|mon|tue|wed|thu|fri|sat|,)+)\s+(\S+)\s+(.*)/i) {
			push(@rv, { 'file' => "$config{'cronfiles_dir'}/$f",
				    'line' => $lnum,
				    'type' => 2,
				    'active' => !$1,
				    'nolog' => $2,
				    'mins' => $3, 'hours' => $4,
				    'days' => $5, 'months' => $6,
				    'weekdays' => $8, 'user' => $10,
				    'command' => $11,
				    'index' => scalar(@rv) });
			&fix_names($rv[$#rv]);
			}
		elsif (/^(#+)?\s*@([a-z]+)\s+(\S+)\s+(.*)/i) {
			push(@rv, { 'file' => "$config{'cronfiles_dir'}/$f",
				    'line' => $lnum,
				    'type' => 2,
				    'active' => !$1,
				    'special' => $2,
				    'user' => $3,
				    'command' => $4,
				    'index' => scalar(@rv) });
			}
		$lnum++;
		}
	close(TAB);
	}

# Read a single user's crontab file
if ($config{'single_file'}) {
	&open_readfile(TAB, $config{'single_file'});
	$lnum = 0;
	while(<TAB>) {
		if (/^(#+)?[\s\&]*(-)?\s*([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+(([0-9\-\*\/]+|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|,)+)\s+(([0-9\-\*\/]+|sun|mon|tue|wed|thu|fri|sat|,)+)\s+(.*)/i) {
			# A normal m h d m wd time
			push(@rv, { 'file' => $config{'single_file'},
				    'line' => $lnum,
				    'type' => 3,
				    'active' => !$1, 'nolog' => $2,
				    'mins' => $3, 'hours' => $4,
				    'days' => $5, 'months' => $6,
				    'weekdays' => $8, 'user' => "NONE",
				    'command' => $10,
				    'index' => scalar(@rv) });
			&fix_names($rv[$#rv]);
			}
		elsif (/^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*'([^']*)'/ ||
		       /^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*"([^']*)"/ ||
		       /^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*(\S+)/) {
			# An environment variable
			push(@rv, { 'file' => $config{'single_file'},
				    'line' => $lnum,
				    'active' => !$1,
				    'name' => $2,
				    'value' => $3,
				    'user' => "NONE",
				    'command' => '',
				    'index' => scalar(@rv) });
			}
		$lnum++;
		}
	close(TAB);
	}

# read per-user cron files
local $fcron = ($config{'cron_dir'} =~ /\/fcron$/);
local @users;
if ($single_user) {
	@users = ( $single_user );
	}
else {
	opendir(DIR, &translate_filename($config{'cron_dir'}));
	@users = grep { !/^\./ } readdir(DIR);
	closedir(DIR);
	}
foreach $f (@users) {
	next if (!(@uinfo = getpwnam($f)));
	$lnum = 0;
	if ($single_user) {
		&open_execute_command(TAB, $config{'cron_user_get_command'}, 1);
		}
	elsif ($fcron) {
		&open_execute_command(TAB,
			&user_sub($config{'cron_get_command'}, $f), 1);
		}
	else {
		&open_readfile(TAB, "$config{'cron_dir'}/$f");
		}
	while(<TAB>) {
		if (/^(#+)?[\s\&]*(-)?\s*([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+([0-9\-\*\/,]+)\s+(([0-9\-\*\/]+|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|,)+)\s+(([0-9\-\*\/]+|sun|mon|tue|wed|thu|fri|sat|,)+)\s+(.*)/i) {
			# A normal m h d m wd time
			push(@rv, { 'file' => "$config{'cron_dir'}/$f",
				    'line' => $lnum,
				    'type' => 0,
				    'active' => !$1, 'nolog' => $2,
				    'mins' => $3, 'hours' => $4,
				    'days' => $5, 'months' => $6,
				    'weekdays' => $8, 'user' => $f,
				    'command' => $10,
				    'index' => scalar(@rv) });
			$rv[$#rv]->{'file'} =~ s/\s+\|$//;
			&fix_names($rv[$#rv]);
			}
		elsif (/^(#+)?\s*@([a-z]+)\s+(.*)/i) {
			# An @ time
			push(@rv, { 'file' => "$config{'cron_dir'}/$f",
				    'line' => $lnum,
				    'type' => 0,
				    'active' => !$1,
				    'special' => $2,
				    'user' => $f,
				    'command' => $3,
				    'index' => scalar(@rv) });
			}
		elsif (/^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*'([^']*)'/ ||
		       /^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*"([^']*)"/ ||
		       /^(#+)?\s*([a-zA-Z0-9\_]+)\s*=\s*(\S+)/) {
			# An environment variable
			push(@rv, { 'file' => "$config{'cron_dir'}/$f",
				    'line' => $lnum,
				    'active' => !$1,
				    'name' => $2,
				    'value' => $3,
				    'user' => $f,
				    'index' => scalar(@rv) });
			}
		$lnum++;
		}
	close(TAB);
	}
closedir(DIR);
@cron_jobs_cache = @rv;
return @cron_jobs_cache;
}

=head2 cron_job_line(&job)

Internal function to generate a crontab format line for a cron job.

=cut
sub cron_job_line
{
local @c;
push(@c, "#") if (!$_[0]->{'active'});
if ($_[0]->{'name'}) {
	push(@c, $_[0]->{'name'});
	push(@c, "=");
	push(@c, $_[0]->{'value'} =~ /'/ ? "\"$_[0]->{'value'}\"" :
		 $_[0]->{'value'} =~ /"/ ? "'$_[0]->{'value'}'" :
		 $_[0]->{'value'} !~ /^\S+$/ ? "\"$_[0]->{'value'}\""
					  : $_[0]->{'value'});
	}
else {
	if ($_[0]->{'special'}) {
		push(@c, ($_[0]->{'nolog'} ? '-' : '').'@'.$_[0]->{'special'});
		}
	else {
		push(@c, ($_[0]->{'nolog'} ? '-' : '').$_[0]->{'mins'},
			 $_[0]->{'hours'}, $_[0]->{'days'},
			 $_[0]->{'months'}, $_[0]->{'weekdays'});
		}
	push(@c, $_[0]->{'user'}) if ($_[0]->{'type'} != 0 &&
				      $_[0]->{'type'} != 3);
	push(@c, $_[0]->{'command'});
	}
if ($gconfig{'os_type'} eq 'syno-linux') {
	return join("\t", @c);
	}
else {
	return join(" ", @c);
	}
}

=head2 copy_cron_temp(&job)

Copies a job's user's current cron configuration to the temp file. For internal
use only.

=cut
sub copy_cron_temp
{
local $fcron = ($config{'cron_dir'} =~ /\/fcron$/);
unlink($cron_temp_file);
if ($single_user) {
	&execute_command($config{'cron_user_get_command'},
			 undef, $cron_temp_file, undef);
	}
elsif ($fcron) {
	&execute_command(&user_sub($config{'cron_get_command'},$_[0]->{'user'}),
			 undef, $cron_temp_file, undef);
	}
else {
	system("cp ".quotemeta(
			&translate_filename("$config{'cron_dir'}/$_[0]->{'user'}")).
	       " ".quotemeta($cron_temp_file)." 2>/dev/null");
	}
}

=head2 create_cron_job(&job)

Add a Cron job to a user's file. The job parameter must be a hash reference
in the same format as returned by list_cron_jobs.

=cut
sub create_cron_job
{
&check_cron_config_or_error();
&list_cron_jobs();	# init cache
if ($config{'add_file'}) {
	# Add to a specific file, typically something like /etc/cron.d/webmin
	$_[0]->{'type'} = 1;
	local $lref = &read_file_lines($config{'add_file'});
	push(@$lref, &cron_job_line($_[0]));
	&flush_file_lines($config{'add_file'});
	}
elsif ($config{'single_file'} && !$config{'cron_dir'}) {
	# Add to the single file
	$_[0]->{'type'} = 3;
	local $lref = &read_file_lines($config{'single_file'});
	push(@$lref, &cron_job_line($_[0]));
	&flush_file_lines($config{'single_file'});
	}
else {
	# Add to the specified user's crontab
	&copy_cron_temp($_[0]);
	local $lref = &read_file_lines($cron_temp_file);
	$_[0]->{'line'} = scalar(@$lref);
	push(@$lref, &cron_job_line($_[0]));
	&flush_file_lines($cron_temp_file);
	&set_ownership_permissions($_[0]->{'user'}, undef, undef,
				   $cron_temp_file);
	&copy_crontab($_[0]->{'user'});
	$_[0]->{'file'} = "$config{'cron_dir'}/$_[0]->{'user'}";
	$_[0]->{'index'} = scalar(@cron_jobs_cache);
	push(@cron_jobs_cache, $_[0]);
	}
}

=head2 insert_cron_job(&job)

Add a Cron job at the top of the user's file. The job parameter must be a hash
reference in the same format as returned by list_cron_jobs.

=cut
sub insert_cron_job
{
&check_cron_config_or_error();
&list_cron_jobs();	# init cache
if ($config{'single_file'} && !$config{'cron_dir'}) {
	# Insert into single file
	$_[0]->{'type'} = 3;
	local $lref = &read_file_lines($config{'single_file'});
	splice(@$lref, 0, 0, &cron_job_line($_[0]));
	&flush_file_lines($config{'single_file'});
	}
else {
	# Insert into the user's crontab
	&copy_cron_temp($_[0]);
	local $lref = &read_file_lines($cron_temp_file);
	$_[0]->{'line'} = 0;
	splice(@$lref, 0, 0, &cron_job_line($_[0]));
	&flush_file_lines();
	&set_ownership_permissions($_[0]->{'user'}, undef, undef, $cron_temp_file);
	&copy_crontab($_[0]->{'user'});
	$_[0]->{'file'} = "$config{'cron_dir'}/$_[0]->{'user'}";
	$_[0]->{'index'} = scalar(@cron_jobs_cache);
	&renumber($_[0]->{'file'}, $_[0]->{'line'}, 1);
	push(@cron_jobs_cache, $_[0]);
	}
}

=head2 renumber(file, line, offset)

All jobs in this file whose line is at or after the given one will be
incremented by the offset. For internal use.

=cut
sub renumber
{
local $j;
foreach $j (@cron_jobs_cache) {
	if ($j->{'line'} >= $_[1] &&
	    $j->{'file'} eq $_[0]) {
		$j->{'line'} += $_[2];
		}
	}
}

=head2 renumber_index(index, offset)

Internal function to change the index of all cron jobs in the cache after
some index by a given offset. For internal use.

=cut
sub renumber_index
{
local $j;
foreach $j (@cron_jobs_cache) {
	if ($j->{'index'} >= $_[0]) {
		$j->{'index'} += $_[1];
		}
	}
}

=head2 change_cron_job(&job)

Updates the given cron job, which must be a hash ref returned by list_cron_jobs
and modified with a new active flag, command or schedule.

=cut
sub change_cron_job
{
if ($_[0]->{'type'} == 0) {
	&copy_cron_temp($_[0]);
	&replace_file_line($cron_temp_file, $_[0]->{'line'},
			   &cron_job_line($_[0])."\n");
	&copy_crontab($_[0]->{'user'});
	}
else {
	&replace_file_line($_[0]->{'file'}, $_[0]->{'line'},
			   &cron_job_line($_[0])."\n");
	}
}

=head2 delete_cron_job(&job)

Removes the cron job defined by the given hash ref, as returned by
list_cron_jobs.

=cut
sub delete_cron_job
{
if ($_[0]->{'type'} == 0) {
	&copy_cron_temp($_[0]);
	&replace_file_line($cron_temp_file, $_[0]->{'line'});
	&copy_crontab($_[0]->{'user'});
	}
else {
	&replace_file_line($_[0]->{'file'}, $_[0]->{'line'});
	}
@cron_jobs_cache = grep { $_ ne $_[0] } @cron_jobs_cache;
&renumber($_[0]->{'file'}, $_[0]->{'line'}, -1);
&renumber_index($_[0]->{'index'}, -1);
}

=head2 read_crontab(user)

Return an array containing the lines of the cron table for some user. For
internal use mainly.

=cut
sub read_crontab
{
local(@tab);
&open_readfile(TAB, "$config{cron_dir}/$_[0]");
@tab = <TAB>;
close(TAB);
if (@tab >= 3 && $tab[0] =~ /DO NOT EDIT/ &&
    $tab[1] =~ /^\s*#/ && $tab[2] =~ /^\s*#/) {
	@tab = @tab[3..$#tab];
	}
return @tab;
}

=head2 copy_crontab(user)

Copy the cron temp file to that for this user. For internal use only.

=cut
sub copy_crontab
{
if (&is_readonly_mode()) {
	# Do nothing
	return undef;
	}
local($pwd);
if (&read_file_contents($cron_temp_file) =~ /\S/) {
	local $temp = &transname();
	local $rv;
	if (!&has_crontab_cmd()) {
		# We have no crontab command .. emulate by copying to user file
		$rv = system("cat ".quotemeta($cron_temp_file).
			" >".quotemeta("$config{'cron_dir'}/$_[0]")." 2>/dev/null");
		&set_ownership_permissions($_[0], undef, 0600,
			"$config{'cron_dir'}/$_[0]");
		}
	elsif ($config{'cron_edit_command'}) {
		# fake being an editor
		local $notemp = &transname();
		&open_tempfile(NO, ">$notemp");
		&print_tempfile(NO, "No\n");
		&print_tempfile(NO, "N\n");
		&print_tempfile(NO, "no\n");
		&close_tempfile(NO);
		$ENV{"VISUAL"} = $ENV{"EDITOR"} =
			"$module_root_directory/cron_editor.pl";
		$ENV{"CRON_EDITOR_COPY"} = $cron_temp_file;
		system("chown ".quotemeta($_[0])." ".quotemeta($cron_temp_file));
		local $oldpwd = &get_current_dir();
		chdir("/");
		if ($single_user) {
			$rv = system($config{'cron_user_edit_command'}.
				     " >".quotemeta($temp)." 2>&1 <".quotemeta($notemp));
			}
		else {
			$rv = system(
				&user_sub($config{'cron_edit_command'},$_[0]).
				" >".quotemeta($temp)." 2>&1 <".quotemeta($notemp));
			}
		unlink($notemp);
		chdir($oldpwd);

} else {
		# use the cron copy command
		if ($single_user) {
			$rv = &execute_command(
				$config{'cron_user_copy_command'},
				quotemeta($cron_temp_file), quotemeta($temp), quotemeta($temp));
			}
		else {
			$rv = &execute_command(
				&user_sub($config{'cron_copy_command'}, $_[0]),
				quotemeta($cron_temp_file), quotemeta($temp), quotemeta($temp));
			}
	}
	local $out = &read_file_contents($temp);
	unlink($temp);
	if ($rv || $out =~ /error/i) {
		local $cronin = &read_file_contents($cron_temp_file);
		&error(&text('ecopy', "<pre>$out</pre>", "<pre>$cronin</pre>"));
		}
	}
else {
	# No more cron jobs left, so just delete
	if (!&has_crontab_cmd()) {
		# We have no crontab command .. emulate by deleting user crontab
		$_[0] || &error("No user given!");
		&unlink_logged("$config{'cron_dir'}/$_[0]");
		}
	else{
		if ($single_user) {
			&execute_command($config{'cron_user_delete_command'});
			}
		else {
			&execute_command(&user_sub(
				$config{'cron_delete_command'}, $_[0]));
			}
		}
	}
if (!&has_crontab_cmd()) {
	# to reload config
	&kill_byname("crond", "SIGHUP");
	}
unlink($cron_temp_file);
}

=head2 parse_job(job-line)

Parse a crontab line into an array containing:
active, mins, hrs, days, mons, weekdays, command

=cut
sub parse_job
{
local($job, $active) = ($_[0], 1);
if ($job =~ /^#+\s*(.*)$/) {
	$active = 0;
	$job = $1;
	}
$job =~ /^\s*(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(.*)$/;
return ($active, $1, $2, $3, $4, $5, $6);
}

=head2 user_sub(command, user)

Replace the string 'USER' in the command with the user name. For internal
use only.

=cut
sub user_sub
{
local($tmp);
$tmp = $_[0];
$tmp =~ s/USER/quotemeta($_[1])/ge;
return $tmp;
}

=head2 list_allowed

Returns a list of all Unix usernames who are allowed to use Cron.

=cut
sub list_allowed
{
local(@rv, $_);
&open_readfile(ALLOW, $config{cron_allow_file});
while(<ALLOW>) {
	next if (/^\s*#/);
	chop; push(@rv, $_) if (/\S/);
	}
close(ALLOW);
return @rv;
}

=head2 list_denied

Return a list of all Unix usernames who are not allowed to use Cron.

=cut
sub list_denied
{
local(@rv, $_);
&open_readfile(DENY, $config{cron_deny_file});
while(<DENY>) {
	next if (/^\s*#/);
	chop; push(@rv, $_) if (/\S/);
	}
close(DENY);
return @rv;
}

=head2 save_allowed(user, user, ...)

Save the list of allowed Unix usernames.

=cut
sub save_allowed
{
local($_);
&open_tempfile(ALLOW, ">$config{cron_allow_file}");
foreach (@_) {
	&print_tempfile(ALLOW, $_,"\n");
	}
&close_tempfile(ALLOW);
chmod(0444, $config{cron_allow_file});
}

=head2 save_denied(user, user, ...)

Save the list of denied Unix usernames.

=cut
sub save_denied
{
local($_);
&open_tempfile(DENY, "> $config{cron_deny_file}");
foreach (@_) {
	&print_tempfile(DENY, $_,"\n");
	}
&close_tempfile(DENY);
chmod(0444, $config{cron_deny_file});
}

=head2 read_envs(user)

Returns an array of "name value" strings containing the environment settings
from the crontab for some user

=cut
sub read_envs
{
local(@tab, @rv, $_);
@tab = &read_crontab($_[0]);
foreach (@tab) {
	chop; s/#.*$//g;
	if (/^\s*(\S+)\s*=\s*(.*)$/) { push(@rv, "$1 $2"); }
	}
return @rv;
}

=head2 save_envs(user, [name, value]*)

Updates the cron file for some user with the given list of environment
variables. All others in the file are removed.

=cut
sub save_envs
{
local($i, @tab, $line);
@tab = &read_crontab($_[0]);
open(TAB, ">".$cron_temp_file);
for($i=1; $i<@_; $i+=2) {
	print TAB "$_[$i]=$_[$i+1]\n";
	}
foreach (@tab) {
	chop($line = $_); $line =~ s/#.*$//g;
	if ($line !~ /^\s*(\S+)\s*=\s*(.*)$/) { print TAB $_; }
	}
close(TAB);
&copy_crontab($_[0]);
}

=head2 expand_run_parts(directory)

Internal function to convert a directory like /etc/cron.hourly into a list
of scripts in that directory.

=cut
sub expand_run_parts
{
local $dir = $_[0];
$dir = "$config{'run_parts_dir'}/$dir"
	if ($config{'run_parts_dir'} && $dir !~ /^\//);
opendir(DIR, &translate_filename($dir));
local @rv = readdir(DIR);
closedir(DIR);
@rv = grep { /^[a-zA-Z0-9\_\-]+$/ } @rv;
@rv = map { $dir."/".$_ } @rv;
@rv = grep { -x $_ } @rv;
return @rv;
}

=head2 is_run_parts(command)

Returns the dir if some cron job runs a list of commands in some directory, 
like /etc/cron.hourly. Returns undef otherwise.

=cut
sub is_run_parts
{
local ($cmd) = @_;
local $rp = $config{'run_parts'};
$cmd =~ s/\s*#.*$//;
return $rp && $cmd =~ /$rp(.*)\s+(\-\-\S+\s+)*([a-z0-9\.\-\/_]+)(\s*\))?$/i ? $3 : undef;
}

=head2 can_edit_user(&access, user)

Returns 1 if the Webmin user whose permissions are defined by the access hash
ref can manage cron jobs for a given Unix user.

=cut
sub can_edit_user
{
local %umap;
map { $umap{$_}++; } split(/\s+/, $_[0]->{'users'})
	if ($_[0]->{'mode'} == 1 || $_[0]->{'mode'} == 2);
if ($_[0]->{'mode'} == 1 && !$umap{$_[1]} ||
    $_[0]->{'mode'} == 2 && $umap{$_[1]}) { return 0; }
elsif ($_[0]->{'mode'} == 3) {
	return $remote_user eq $_[1];
	}
elsif ($_[0]->{'mode'} == 4) {
	local @u = getpwnam($_[1]);
	return (!$_[0]->{'uidmin'} || $u[2] >= $_[0]->{'uidmin'}) &&
	       (!$_[0]->{'uidmax'} || $u[2] <= $_[0]->{'uidmax'});
	}
elsif ($_[0]->{'mode'} == 5) {
	local @u = getpwnam($_[1]);
	return $u[3] == $_[0]->{'users'};
	}
else {
	return 1;
	}
}

=head2 list_cron_specials()

Returns a list of the names of special cron times, prefixed by an @ in crontab

=cut
sub list_cron_specials
{
return ('hourly', 'daily', 'weekly', 'monthly', 'yearly', 'reboot');
}

=head2 get_times_input(&job, [nospecial], [width-in-cols], [message])

Returns HTML for selecting the schedule for a cron job, defined by the first
parameter which must be a hash ref returned by list_cron_jobs. Suitable for
use inside a ui_table_start/end

=cut
sub get_times_input
{
return &theme_get_times_input(@_) if (defined(&theme_get_times_input));
my ($job, $nospecial, $width, $msg) = @_;
$width ||= 2;

# Javascript to disable and enable fields
my $rv = <<EOF;
<script>
function enable_cron_fields(name, form, ena)
{
var els = form.elements[name];
els.disabled = !ena;
for(i=0; i<els.length; i++) {
  els[i].disabled = !ena;
  }
change_special_mode(form, 0);
}

function change_special_mode(form, special)
{
  if(form.special_def) {
    form.special_def[0].checked = special;
    form.special_def[1].checked = !special;
  }
}
</script>
EOF

if ($config{'vixie_cron'} && (!$nospecial || $job->{'special'})) {
	# Allow selection of special @ times
	my $sp = $job->{'special'} eq 'midnight' ? 'daily' :
		 $job->{'special'} eq 'annually' ? 'yearly' : $job->{'special'};
	my $specialsel = &ui_select("special", $sp,
			[ map { [ $_, $text{'edit_special_'.$_} ] }
			      &list_cron_specials() ],
			1, 0, 0, 0, "onChange='change_special_mode(form, 1)'");
	$rv .= &ui_table_row($msg,
		&ui_radio("special_def", $job->{'special'} ? 1 : 0,
			  [ [ 1, $text{'edit_special1'}."&nbsp;&nbsp;".$specialsel ],
			    [ 0, $text{'edit_special0'} ] ]),
			  $msg ? $width-1 : $width);
	}

# Section for time selections
my $table = &ui_columns_start([ $text{'edit_mins'}, $text{'edit_hours'},
				$text{'edit_days'}, $text{'edit_months'},
				$text{'edit_weekdays'} ], 100);
my @mins = (0..59);
my @hours = (0..23);
my @days = (1..31);
my @months = map { $text{"month_$_"}."=".$_ } (1 .. 12);
my @weekdays = map { $text{"day_$_"}."=".$_ } (0 .. 6);
my %arrmap = ( 'mins' => \@mins,
	       'hours' => \@hours,
	       'days' => \@days,
	       'months' => \@months,
	       'weekdays' => \@weekdays );
my @cols;
foreach my $arr ("mins", "hours", "days", "months", "weekdays") {
	# Find out which ones are being used
	my %inuse;
	my $min = ($arr =~ /days|months/ ? 1 : 0);
	my @arrlist = @{$arrmap{$arr}};
	my $max = $min+scalar(@arrlist)-1;
	foreach my $w (split(/,/ , $job->{$arr})) {
		if ($w eq "*") {
			# all values
			for($j=$min; $j<=$max; $j++) { $inuse{$j}++; }
			}
		elsif ($w =~ /^\*\/(\d+)$/) {
			# only every Nth
			for($j=$min; $j<=$max; $j+=$1) { $inuse{$j}++; }
			}
		elsif ($w =~ /^(\d+)-(\d+)\/(\d+)$/) {
			# only every Nth of some range
			for($j=$1; $j<=$2; $j+=$3) { $inuse{int($j)}++; }
			}
		elsif ($w =~ /^(\d+)-(\d+)$/) {
			# all of some range
			for($j=$1; $j<=$2; $j++) { $inuse{int($j)}++; }
			}
		else {
			# One value
			$inuse{int($w)}++;
			}
		}
	if ($job->{$arr} eq "*") {
		%inuse = ( );
		}

# Output selection list
	my $dis = $arr eq "mins" && $hourly_only;
	my $col = &ui_radio(
		    "all_$arr", $job->{$arr} eq "*" ||
				$job->{$arr} eq "" ? 1 : 0,
		    [ [ 1, $text{'edit_all'}."<br>",
			"onClick='enable_cron_fields(\"$arr\", form, 0)'" ],
		      [ 0, $text{'edit_selected'}."<br>",
			"onClick='enable_cron_fields(\"$arr\", form, 1)'" ] ],
		    $dis);
	$col .= "<table> <tr>\n";
        for(my $j=0; $j<@arrlist; $j+=($arr eq "mins" && $hourly_only ? 60 : 12)) {
                my $jj = $j+($arr eq "mins" && $hourly_only ? 59 : 11);
		if ($jj >= @arrlist) { $jj = @arrlist - 1; }
		my @sec = @arrlist[$j .. $jj];
		my @opts;
		foreach my $v (@sec) {
			if ($v =~ /^(.*)=(.*)$/) {
				push(@opts, [ $2, $1 ]);
				}
			else {
				push(@opts, [ $v, $v ]);
				}
			}
		my $dis = $job->{$arr} eq "*" || $job->{$arr} eq "";
		$col .= "<td valign=top>".
			&ui_select($arr, [ keys %inuse ], \@opts,
			  @sec > 12 ? ($arr eq "mins" && $hourly_only ? 1 : 12)
                                  : scalar(@sec),
			  $arr eq "mins" && $hourly_only ? 0 : 1,
			  0, $dis).
			"</td>\n";
		}
	$col .= "</tr></table>\n";
	push(@cols, $col);
	}
$table .= &ui_columns_row(\@cols, [ "valign=top", "valign=top", "valign=top",
				    "valign=top", "valign=top" ]);
$table .= &ui_columns_end();
$table .= &ui_note($text{'edit_ctrl'}, 0);
$rv .= &ui_table_row(undef, $table, $width, undef, ['data-schedule-tr']);
return $rv;
}

=head2 show_times_input(&job, [nospecial])

Print HTML for inputs for selecting the schedule for a cron job, defined
by the first parameter which must be a hash ref returned by list_cron_jobs.
This must be used inside a <table>, as the HTML starts and ends with <tr>
tags.

=cut
sub show_times_input
{
return &theme_show_times_input(@_) if (defined(&theme_show_times_input));
local $job = $_[0];
if ($config{'vixie_cron'} && (!$_[1] || $_[0]->{'special'})) {
	# Allow selection of special @ times
	print "<tr data-schedule-tr $cb> <td colspan=6>\n";
	printf "<input type=radio name=special_def value=1 %s> %s\n",
		$job->{'special'} ? "checked" : "", $text{'edit_special1'};
	print "<select name=special onChange='change_special_mode(form, 1)'>\n";
	local $s;
	local $sp = $job->{'special'} eq 'midnight' ? 'daily' :
	    $job->{'special'} eq 'annually' ? 'yearly' : $job->{'special'};
	foreach $s ('hourly', 'daily', 'weekly', 'monthly', 'yearly', 'reboot'){
		printf "<option value=%s %s>%s</option>\n",
		    $s, $sp eq $s ? "selected" : "", $text{'edit_special_'.$s};
		}
	print "</select>\n";
	printf "<input type=radio name=special_def value=0 %s> %s\n",
		$job->{'special'} ? "" : "checked", $text{'edit_special0'};
	print "</td></tr>\n";
	}

# Javascript to disable and enable fields
print <<EOF;
<script>
function enable_cron_fields(name, form, ena)
{
var els = form.elements[name];
els.disabled = !ena;
for(i=0; i<els.length; i++) {
  els[i].disabled = !ena;
  }
change_special_mode(form, 0);
}

function change_special_mode(form, special)
{
  if(form.special_def) {
    form.special_def[0].checked = special;
    form.special_def[1].checked = !special;
  }
}
</script>
EOF

print "<tr $tb>\n";
print "<td><b>$text{'edit_mins'}</b></td> <td><b>$text{'edit_hours'}</b></td> ",
      "<td><b>$text{'edit_days'}</b></td> <td><b>$text{'edit_months'}</b></td>",
      "<td><b>$text{'edit_weekdays'}</b></td> </tr> <tr $cb>\n";

local @mins = (0..59);
local @hours = (0..23);
local @days = (1..31);
local @months = map { $text{"month_$_"}."=".$_ } (1 .. 12);
local @weekdays = map { $text{"day_$_"}."=".$_ } (0 .. 6);

foreach $arr ("mins", "hours", "days", "months", "weekdays") {
	# Find out which ones are being used
	local %inuse;
	local $min = ($arr =~ /days|months/ ? 1 : 0);
	local $max = $min+scalar(@$arr)-1;
	foreach $w (split(/,/ , $job->{$arr})) {
		if ($w eq "*") {
			# all values
			for($j=$min; $j<=$max; $j++) { $inuse{$j}++; }
			}
		elsif ($w =~ /^\*\/(\d+)$/) {
			# only every Nth
			for($j=$min; $j<=$max; $j+=$1) { $inuse{$j}++; }
			}
		elsif ($w =~ /^(\d+)-(\d+)\/(\d+)$/) {
			# only every Nth of some range
			for($j=$1; $j<=$2; $j+=$3) { $inuse{int($j)}++; }
			}
		elsif ($w =~ /^(\d+)-(\d+)$/) {
			# all of some range
			for($j=$1; $j<=$2; $j++) { $inuse{int($j)}++; }
			}
		else {
			# One value
			$inuse{int($w)}++;
			}
		}
	if ($job->{$arr} eq "*") { undef(%inuse); }

# Output selection list
	print "<td valign=top>\n";
        printf "<input type=radio name=all_$arr value=1 %s %s %s> %s<br>\n",
                $arr eq "mins" && $hourly_only ? "disabled" : "",
		$job->{$arr} eq "*" ||  $job->{$arr} eq "" ? "checked" : "",
		"onClick='enable_cron_fields(\"$arr\", form, 0)'",
		$text{'edit_all'};
	printf "<input type=radio name=all_$arr value=0 %s %s> %s<br>\n",
		$job->{$arr} eq "*" || $job->{$arr} eq "" ? "" : "checked",
		"onClick='enable_cron_fields(\"$arr\", form, 1)'",
		$text{'edit_selected'};
	print "<table> <tr>\n";
        for($j=0; $j<@$arr; $j+=($arr eq "mins" && $hourly_only ? 60 : 12)) {
                $jj = $j+($arr eq "mins" && $hourly_only ? 59 : 11);
		if ($jj >= @$arr) { $jj = @$arr - 1; }
		@sec = @$arr[$j .. $jj];
                printf "<td valign=top><select %s size=%d name=$arr %s %s>\n",
                        $arr eq "mins" && $hourly_only ? "" : "multiple",
                        @sec > 12 ? ($arr eq "mins" && $hourly_only ? 1 : 12)
				  : scalar(@sec),
			$job->{$arr} eq "*" ||  $job->{$arr} eq "" ?
				"disabled" : "",
			"onChange='change_special_mode(form, 0)'";
		foreach $v (@sec) {
			if ($v =~ /^(.*)=(.*)$/) { $disp = $1; $code = $2; }
			else { $disp = $code = $v; }
			printf "<option value=\"$code\" %s>$disp</option>\n",
				$inuse{$code} ? "selected" : "";
			}
		print "</select></td>\n";
		}
	print "</tr></table></td>\n";
	}
my $ctlnote = &ui_note($text{'edit_ctrl'}, 0);
print "</tr> <tr $cb> <td colspan=5>$ctlnote</td> </tr>\n";
}

=head2 parse_times_input(&job, &in)

Parses inputs from the form generated by show_times_input, and updates a cron
job hash ref. The in parameter must be a hash ref as generated by the 
ReadParse function.

=cut
sub parse_times_input
{
local $job = $_[0];
local %in = %{$_[1]};
local @pers = ("mins", "hours", "days", "months", "weekdays");
local $arr;
if ($in{'special_def'}) {
	# Job time is a special period
	foreach $arr (@pers) {
		delete($job->{$arr});
		}
	$job->{'special'} = $in{'special'};
	}
else {
	# User selection of times
	foreach $arr (@pers) {
		if ($in{"all_$arr"}) {
			# All mins/hrs/etc.. chosen
			$job->{$arr} = "*";
			}
		elsif (defined($in{$arr})) {
			# Need to work out and simplify ranges selected
			local (@range, @newrange, $i);
			@range = split(/\0/, $in{$arr});
			@range = sort { $a <=> $b } @range;
			local $start = -1;
			for($i=0; $i<@range; $i++) {
				if ($i && $range[$i]-1 == $range[$i-1]) {
					# ok.. looks like a range
					if ($start < 0) { $start = $i-1; }
					}
				elsif ($start < 0) {
					# Not in a range at all
					push(@newrange, $range[$i]);
					}
				else {
					# End of the range.. add it
					$newrange[@newrange - 1] =
						"$range[$start]-".$range[$i-1];
					push(@newrange, $range[$i]);
					$start = -1;
					}
				}
			if ($start >= 0) {
				# Reached the end while in a range
				$newrange[@newrange - 1] =
					"$range[$start]-".$range[$i-1];
				}
			$job->{$arr} = join(',' , @newrange);
			}
		else {
			&error(&text('save_enone', $text{"edit_$arr"}));
			}
		}
	delete($job->{'special'});
	}
}

=head2 show_range_input(&job)

Given a cron job, prints fields for selecting it's run date range.

=cut
sub show_range_input
{
local ($job) = @_;
local $has_start = $job->{'start'};
local $rng;
$rng = &text('range_start', &ui_date_input(
	$job->{'start'}->[0], $job->{'start'}->[1], $job->{'start'}->[2],
	"range_start_day", "range_start_month", "range_start_year"))."\n".
      &date_chooser_button(
	"range_start_day", "range_start_month", "range_start_year")."\n".
      &text('range_end', &ui_date_input(
	$job->{'end'}->[0], $job->{'end'}->[1], $job->{'end'}->[2],
	"range_end_day", "range_end_month", "range_end_year"))."\n".
      &date_chooser_button(
	"range_end_day", "range_end_month", "range_end_year")."\n";
print &ui_oneradio("range_def", 1, $text{'range_all'}, !$has_start),
      "<br>\n";
print &ui_oneradio("range_def", 0, $rng, $has_start),"\n";
}

=head2 parse_range_input(&job, &in)

Updates the job object with the specified date range. May call &error
for invalid inputs.

=cut
sub parse_range_input
{
local ($job, $in) = @_;
if ($in->{'range_def'}) {
	# No range used
	delete($job->{'start'});
	delete($job->{'end'});
	}
else {
	# Validate and store range
	foreach my $r ("start", "end") {
		eval { timelocal(0, 0, 0, $in->{'range_'.$r.'_day'},
					  $in->{'range_'.$r.'_month'}-1,
					  $in->{'range_'.$r.'_year'}-1900) };
		if ($@) {
			&error($text{'range_e'.$r}." ".$@);
			}
		$job->{$r} = [ $in->{'range_'.$r.'_day'},
			       $in->{'range_'.$r.'_month'},
			       $in->{'range_'.$r.'_year'} ];
		}
	}
}

@cron_month = ( 'jan', 'feb', 'mar', 'apr', 'may', 'jun',
		'jul', 'aug', 'sep', 'oct', 'nov', 'dec' );
@cron_weekday = ( 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat' );

=head2 fix_names(&cron)

Convert day and month names to numbers. For internal use when parsing
the crontab file.

=cut
sub fix_names
{
local ($m, $w);

local @mts = split(/,/, $_[0]->{'months'});
foreach $m (@mts) {
	local $mi = &indexof(lc($m), @cron_month);
	$m = $mi+1 if ($mi >= 0);
	}
$_[0]->{'months'} = join(",", @mts);

local @wds = split(/,/, $_[0]->{'weekdays'});
foreach $w (@wds) {
	local $di = &indexof(lc($w), @cron_weekday);
	$w = $di if ($di >= 0);
	$w = 0 if ($w == 7);
	}
$_[0]->{'weekdays'} = join(",", @wds);
}

=head2 cron_file(&job)

Returns the file that a cron job is in, or will be in when it is created
based on the username.

=cut
sub cron_file
{
return $_[0]->{'file'} || $config{'add_file'} ||
       "$config{'cron_dir'}/$_[0]->{'user'}";
}

=head2 when_text(&job, [upper-case-first])

Returns a human-readable text string describing when a cron job is run.

=cut
sub when_text
{
my ($job, $ucfirst) = @_;
my $pfx = $ucfirst ? "uc" : "";
if ($job->{'interval'}) {
	return &text($pfx.'when_interval', $job->{'interval'});
	}
elsif ($job->{'special'}) {
	$pfx = $_[1] ? "" : "lc";
	return $text{$pfx.'edit_special_'.$job->{'special'}};
	}
elsif ($job->{'boot'}) {
	return &text($pfx.'when_boot');
	}
elsif ($job->{'mins'} eq '*' && $job->{'hours'} eq '*' &&
       $job->{'days'} eq '*' && $job->{'months'} eq '*' &&
       $job->{'weekdays'} eq '*') {
	return $text{$pfx.'when_min'};
	}
elsif ($job->{'mins'} =~ /^\d+$/ && $job->{'hours'} eq '*' &&
       $job->{'days'} eq '*' && $job->{'months'} eq '*' &&
       $job->{'weekdays'} eq '*') {
	return &text($pfx.'when_hour', $job->{'mins'});
	}
elsif ($job->{'mins'} =~ /^\d+$/ && $job->{'hours'} =~ /^\d+$/ &&
       $job->{'days'} eq '*' && $job->{'months'} eq '*' &&
       $job->{'weekdays'} eq '*') {
	return &text($pfx.'when_day',
		     sprintf("%2.2d", $job->{'mins'}),
		     sprintf("%2.2d", $job->{'hours'}));
	}
elsif ($job->{'mins'} =~ /^\d+$/ && $job->{'hours'} =~ /^\d+$/ &&
       $job->{'days'} =~ /^\d+$/ && $job->{'months'} eq '*' &&
       $job->{'weekdays'} eq '*') {
	return &text($pfx.'when_month',
		     sprintf("%2.2d", $job->{'mins'}),
		     sprintf("%2.2d", $job->{'hours'}),
		     $job->{'days'});
	}
elsif ($job->{'mins'} =~ /^\d+$/ && $job->{'hours'} =~ /^\d+$/ &&
       $job->{'days'} eq '*' && $job->{'months'} eq '*' &&
       $job->{'weekdays'} =~ /^\d+$/) {
	return &text($pfx.'when_weekday',
		     sprintf("%2.2d", $job->{'mins'}),
		     sprintf("%2.2d", $job->{'hours'}),
		     $text{"day_".$job->{'weekdays'}});
	}
else {
	return &text($pfx.'when_cron', join(" ", $job->{'mins'}, $job->{'hours'}, $job->{'days'}, $job->{'months'}, $job->{'weekdays'}));
	}
}

=head2 can_use_cron(user)

Returns 1 if some user is allowed to use cron, based on cron.allow and
cron.deny files.

=cut
sub can_use_cron
{
local ($user) = @_;
defined(getpwnam($user)) || return 0;	# User does not exist
local $err;
if (-r $config{cron_allow_file}) {
	local @allowed = &list_allowed();
	if (&indexof($user, @allowed) < 0 &&
	    &indexof("all", @allowed) < 0) { $err = 1; }
	}
elsif (-r $config{cron_deny_file}) {
	local @denied = &list_denied();
	if (&indexof($user, @denied) >= 0 ||
	    &indexof("all", @denied) >= 0) { $err = 1; }
	}
elsif ($config{cron_deny_all} == 0) { $err = 1; }
elsif ($config{cron_deny_all} == 1) {
	if ($in{user} ne "root") { $err = 1; }
	}
return !$err;
}

=head2 swap_cron_jobs(&job1, &job2)

Swaps two Cron jobs, which must be in the same file, identified by their
hash references as returned by list_cron_jobs.

=cut
sub swap_cron_jobs
{
if ($_[0]->{'type'} == 0) {
	&copy_cron_temp($_[0]);
	local $lref = &read_file_lines($cron_temp_file);
	($lref->[$_[0]->{'line'}], $lref->[$_[1]->{'line'}]) =
		($lref->[$_[1]->{'line'}], $lref->[$_[0]->{'line'}]);
	&flush_file_lines();
	&copy_crontab($_[0]->{'user'});
	}
else {
	local $lref = &read_file_lines($_[0]->{'file'});
	($lref->[$_[0]->{'line'}], $lref->[$_[1]->{'line'}]) =
		($lref->[$_[1]->{'line'}], $lref->[$_[0]->{'line'}]);
	&flush_file_lines();
	}
}

=head2 find_cron_process(&job, [&procs])

Finds the running process that was launched from a cron job. The parameters are:

=item job - A cron job hash reference

=item procs - An optional array reference of running process hash refs

=cut
sub find_cron_process
{
local @procs;
if ($_[1]) {
	@procs = @{$_[1]};
	}
else {
	&foreign_require("proc", "proc-lib.pl");
	@procs = &proc::list_processes();
	}
local $rpd = &is_run_parts($_[0]->{'command'});
local @exp = $rpd ? &expand_run_parts($rpd) : ();
local $cmd = $exp[0] || $_[0]->{'command'};
$cmd =~ s/^\s*\[.*\]\s+\&\&\s+//;
$cmd =~ s/^\s*\[.*\]\s+\|\|\s+//;
while($cmd =~ s/(\d*)(<|>)((\/\S+)|&\d+)\s*$//) { }
$cmd =~ s/^$(.*)$\s*$/$1/;
$cmd =~ s/\s+$//;
my $eos;
if ($config{'match_mode'} == 1) {
	$cmd =~ s/\s.*$//;
	$eos = '$';
	}
else {
	my $cmd_ = $cmd;
	$cmd_ =~ s/\s.*$//;
	if ($cmd_ eq $cmd) {
		$eos = '$';
		}
	}

# If `Input to command` is set, remove it for test case
# otherwise cmd will always be displayed as not running
my $cmd_ = $cmd;

# First remove only input to command and preserve
# potential arguments containing escaped %, like \\%
$cmd_ =~ s/(?<!\\)%.*//;

# Now replace escaped \\ special chars for testing purposes
$cmd_ =~ s/\\//g;

($proc) = grep { $_->{'args'} =~ /\Q$cmd_\E$eos/ &&
		 (!$config{'match_user'} || $_->{'user'} eq $_[0]->{'user'}) }
		@procs;
if (!$proc && $cmd =~ /^$config_directory\/(.*\.pl)(.*)$/) {
	# Must be a Webmin wrapper
	$cmd = "$root_directory/$1$2";
	($proc) = grep { $_->{'args'} =~ /\Q$cmd\E/ &&
			 (!$config{'match_user'} ||
			  $_->{'user'} eq $_[0]->{'user'}) }
			@procs;
	}
return $proc;
}

=head2 find_cron_job(command, [&jobs], [user])

Returns the cron job object that runs some command (perhaps with redirection)

=cut
sub find_cron_job
{
my ($cmd, $jobs, $user) = @_;
if (!$jobs) {
	$jobs = [ &list_cron_jobs() ];
	}
$user ||= "root";
my @rv = grep { $_->{'user'} eq $user &&
	     $_->{'command'} =~ /(^|[ \|\&;\/])\Q$cmd\E($|[ \|\&><;])/ } @$jobs;
return wantarray ? @rv : $rv[0];
}

=head2 extract_input(command)

Given a line formatted like I<command%input>, returns the command and input
parts, taking any escaping into account.

=cut
sub extract_input
{
local ($cmd) = @_;
$cmd =~ s/\\%/\0/g;
local ($cmd, $input) = split(/\%/, $cmd, 2);
$cmd =~ s/\0/\\%/g;
$input =~ s/\0/\\%/g;
return ($cmd, $input);
}

=head2 convert_range(&job)

Given a cron job that uses range.pl, work out the date range and update
the job object command. Mainly for internal use.

=cut
sub convert_range
{
local ($job) = @_;
local ($cmd, $input) = &extract_input($job->{'command'});
if ($cmd =~ /^\Q$range_cmd\E\s+(\d+)\-(\d+)\-(\d+)\s+(\d+)\-(\d+)\-(\d+)\s+(.*)$/) {
	# Looks like a range command
	$job->{'start'} = [ $1, $2, $3 ];
	$job->{'end'} = [ $4, $5, $6 ];
	$job->{'command'} = $7;
	$job->{'command'} =~ s/\\(.)/$1/g;
	if ($input) {
		$job->{'command'} .= '%'.$input;
		}
	return 1;
	}
return 0;
}

=head2 unconvert_range(&job)

Give a cron job with start and end fields, updates the command to wrap it in
range.pl with those dates as parameters.

=cut
sub unconvert_range
{
local ($job) = @_;
if ($job->{'start'}) {
	# Need to add range command
	local ($cmd, $input) = &extract_input($job->{'command'});
	$job->{'command'} = $range_cmd." ".join("-", @{$job->{'start'}})." ".
					   join("-", @{$job->{'end'}})." ".
					   quotemeta($cmd);
	if ($input) {
		$job->{'command'} .= '%'.$input;
		}
	delete($job->{'start'});
	delete($job->{'end'});
	&copy_source_dest("$module_root_directory/range.pl", $range_cmd);
	&set_ownership_permissions(undef, undef, 0755, $range_cmd);
	return 1;
	}
return 0;
}

=head2 convert_comment(&job)

Given a cron job with a # comment after the command, sets the comment field

=cut
sub convert_comment
{
local ($job) = @_;
if ($job->{'command'} =~ /^(.*\S)\s*#([^#]*)$/) {
	$job->{'command'} = $1;
	$job->{'comment'} = $2;
	return 1;
	}
return 0;
}

=head2 unconvert_comment(&job)

Adds an comment back to the command in a cron job, based on the comment field
of the given hash reference.

=cut
sub unconvert_comment
{
local ($job) = @_;
if ($job->{'comment'} =~ /\S/) {
	$job->{'command'} .= " #".$job->{'comment'};
	return 1;
	}
return 0;
}

=head2 check_cron_config

Returns an error message if the cron config doesn't look valid, or some needed
command is missing.

=cut
sub check_cron_config
{
# Check for single file and getter command
if ($config{'single_file'} && !-r $config{'single_file'}) {
	return &text('index_esingle', "<tt>$config{'single_file'}</tt>");
	}
if (!&has_crontab_cmd() && $config{'cron_get_command'} =~ /^(\S+)/ &&
    !&has_command("$1")) {
	return &text('index_ecmd', "<tt>$1</tt>");
	}
# Check for directory
local $fcron = ($config{'cron_dir'} =~ /\/fcron$/);
if (!$single_user && !$config{'single_file'} &&
    !$fcron && !-d $config{'cron_dir'}) {
	if (!$in{'create_dir'}) {
		return &text('index_ecrondir', "<tt>$config{'cron_dir'}</tt>").
		"<p><a href=\"index.cgi?create_dir=yes\">".&text('index_ecrondir_create' ,"<tt>$config{'cron_dir'}</tt>")."</a></p>";
	} else {
		&make_dir($config{'cron_dir'}, 0755);
		}
	}
return undef;
}

=head2 check_cron_config_or_error

Calls check_cron_config, and then error if any problems were detected.

=cut
sub check_cron_config_or_error
{
local $err = &check_cron_config();
if ($err) {
	&error(&text('index_econfigcheck', $err));
	}
}

=head2 cleanup_temp_files

Called from cron to delete old files in the Webmin temp directory, and also
old lock links directories.

=cut
sub cleanup_temp_files
{
# Don't run if disabled
if (!$gconfig{'tempdelete_days'}) {
	print STDERR "Temp file clearing is disabled\n";
	return;
	}

# Cleanup files in the default Webmin temp directory
if ($gconfig{'tempdir'} && !$gconfig{'tempdirdelete'}) {
	print STDERR "Temp file clearing is not done for the custom directory $gconfig{'tempdir'}\n";
	}
else {
	my $tempdir = &transname();
	$tempdir =~ s/\/([^\/]+)$//;
	if (!$tempdir || $tempdir eq "/") {
		$tempdir = &default_webmin_temp_dir();
		}

my $cutoff = time() - $gconfig{'tempdelete_days'}*24*60*60;
	if (opendir(DIR, $tempdir)) {
		foreach my $f (readdir(DIR)) {
			next if ($f eq "." || $f eq "..");
			my @st = lstat("$tempdir/$f");
			if ($st[9] < $cutoff) {
				&unlink_file("$tempdir/$f");
				}
			}
		closedir(DIR);
		}
	}

# Delete stale lock files
my $lockdir = $var_directory."/locks";
if (opendir(DIR, $lockdir)) {
	foreach my $f (readdir(DIR)) {
		next if ($f eq "." || $f eq "..");
		next if ($f !~ /^\d+$/);
		if (!kill(0, $f)) {
			# Process is gone, but never cleaned up!
			&unlink_file("$lockdir/$f");
			}
		}
	closedir(DIR);
	}

# Cleanup old websockets
foreach (&get_miniserv_websockets_modules()) {
	&cleanup_miniserv_websockets(undef, $_);
	}

# Delete forgot-password files older than 1 day
if (opendir(DIR, $main::forgot_password_link_dir)) {
	my $cutoff = time() - 24*60*60;
	foreach my $f (readdir(DIR)) {
		next if ($f eq "." || $f eq "..");
		next if ($f eq "ratelimit");
		my $path = $main::forgot_password_link_dir."/".$f;
		my @st = stat($path);
		if ($st[9] < $cutoff) {
			&unlink_file($path);
			}
		}
	closedir(DIR);
	}
}

=head2 list_cron_files()

Returns a list of all files containing cron jobs

=cut
sub list_cron_files
{
my @jobs = &list_cron_jobs();
my @files = map { $_->{'file'} } grep { $_->{'file'} } @jobs;
if ($config{'system_crontab'}) {
	push(@files, $config{'system_crontab'});
	}
if ($config{'cronfiles_dir'}) {
	push(@files, glob(&translate_filename($config{'cronfiles_dir'})."/*"));
	@files = grep { -f $_ } @files;
	}
return &unique(@files);
}

=head2 has_crontab_cmd()

Returns 1 if the crontab command exists on this system

=cut
sub has_crontab_cmd
{
my $cmd = $config{'cron_edit_command'};
if ($cmd) {
	$cmd =~ s/^su.*-c\s+//;
	($cmd) = &split_quoted_string($cmd);
	my $rv = &has_command($cmd);
	return $rv if ($rv);
	}
return &has_command("crontab");
}

=head2 next_run(&job)

Given a cron job, returns the unix time on which it will run next.

=cut
sub next_run
{
my ($job) = @_;
my $now = time();
my @tm = localtime($now);
if ($job->{'special'} eq 'hourly') {
	$job = { 'mins' => 0,
		 'hours' => '*',
		 'days' => '*',
		 'months' => '*',
		 'weekdays' => '*' };
	}
elsif ($job->{'special'} eq 'daily') {
	$job = { 'mins' => 0,
		 'hours' => 0,
		 'days' => '*',
		 'months' => '*',
		 'weekdays' => '*' };
	}
elsif ($job->{'special'} eq 'weekly') {
	$job = { 'mins' => 0,
		 'hours' => 0,
		 'days' => '*',
		 'months' => '*',
		 'weekdays' => 0 };
	}
elsif ($job->{'special'} eq 'monthly') {
	$job = { 'mins' => 0,
		 'hours' => 0,
		 'days' => '1',
		 'months' => '*',
		 'weekdays' => '*' };
	}
elsif ($job->{'special'} eq 'yearly') {
	$job = { 'mins' => 0,
		 'hours' => 0,
		 'days' => 1,
		 'months' => 1,
		 'weekdays' => '*' };
	}
elsif ($job->{'special'} eq 'reboot') {
	return undef;
	}
my @mins = &cron_all_ranges($job->{'mins'}, 0, 59);
my @hours = &cron_all_ranges($job->{'hours'}, 0, 23);
my @days = &cron_all_ranges($job->{'days'}, 1, 31);
my @months = &cron_all_ranges($job->{'months'}, 1, 12);
my @weekdays = &cron_all_ranges($job->{'weekdays'}, 0, 6);
my ($min, $hour, $day, $month, $year);
my @possible;
foreach $min (@mins) {
	foreach $hour (@hours) {
		foreach $day (@days) {
			foreach $month (@months) {
				foreach $year ($tm[5] .. $tm[5]+7) {
					my $tt;
					eval { $tt = timelocal(0, $min, $hour, $day, $month-1, $year) };
					next if ($tt < $now);
					my @ttm = localtime($tt);
					next if (&indexof($ttm[6], @weekdays) < 0);
					push(@possible, $tt);
					last;
					}
				}
			}
		}
	}
@possible = sort { $a <=> $b } @possible;
return $possible[0];
}

=head2 cron_range(range, min, max)

=cut
sub cron_range
{
my ($w, $min, $max) = @_;
my $j;
my %inuse;
if ($w eq "*") {
	# all values
	for($j=$min; $j<=$max; $j++) { $inuse{$j}++; }
	}
elsif ($w =~ /^\*\/(\d+)$/) {
	# only every Nth
	my $step = $1 || 1;
	for($j=$min; $j<=$max; $j+=$step) { $inuse{$j}++; }
	}
elsif ($w =~ /^(\d+)-(\d+)\/(\d+)$/) {
	# only every Nth of some range
	my $step = $3 || 1;
	for($j=$1; $j<=$2; $j+=$step) { $inuse{int($j)}++; }
	}
elsif ($w =~ /^(\d+)-(\d+)$/) {
	# all of some range
	for($j=$1; $j<=$2; $j++) { $inuse{int($j)}++; }
	}
else {
	# One value
	$inuse{int($w)}++;
	}
return sort { $a <=> $b } (keys %inuse);
}

=head2 cron_all_ranges(comma-list, min, max)

=cut
sub cron_all_ranges
{
my @rv;
foreach $r (split(/,/, $_[0])) {
	push(@rv, &cron_range($r, $_[1], $_[2]));
	}
return sort { $a <=> $b } @rv;
}

cmd: