This file is indexed.

/usr/sbin/a2query is in apache2 2.4.18-2ubuntu3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
#! /usr/bin/perl

# a2query - Apache2 helper to retrieve configuration informations
# Copyright (C) 2012 Arno Töll <debian@toell.net>
#
# This program is licensed at your choice under the terms of the GNU General
# Public License version 2+ or under the terms of the Apache Software License
# 2.0.
#
# For GPL-2+:
# 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; either version 2
# of the License, or (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
# USA.
#
# For ASF 2.0:
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


use feature "switch";
use strict;
use Getopt::Std;

=head1 NAME

a2query - retrieve runtime configuration from a local Apache 2 HTTP server

=cut


our $APACHE2 = "apache2ctl";
our $API = "20120211";
our $MODULE_DIR = "/usr/lib/apache2/modules/";
our $SERVER_VERSION = "2.4.18";
our $MODULE_DIR = "/usr/lib/apache2/modules/";
our $STATE_DIR = "/var/lib/apache2";
our @STATES = ("maint", "admin");

our $MPM = "invalid";
our $CONFIG_DIR = "/etc/apache2";
our $QUIET = 0;

# time to introduce more _exit_ values
our $E_OK = '0';
our $E_FOUND = '0';
our $E_NOTFOUND = '1';
our $E_OFFBYADMIN = '32';
our $E_OFFBYMAINT = '33';
our @RETVALS = ( $E_OK, $E_FOUND, $E_OFFBYADMIN, $E_NOTFOUND, $E_OFFBYMAINT );

our @MODULES = ();
our @CONFS = ();
our @SITES =();
our @HELP = ();
our %verbose_state = ( 'admin' => 'site administrator', 'maint' => 'maintainer script', 'unknown' => 'unknown' );

=head1 SYNOPSIS

B<a2query>  [S<-m> [I<MODULE>]] [S<-s> [I<SITE>]] [S<-c> [I<CONF>]] [S<-a>] [S<-v>]
[S<-M>] [S<-d>] [S<-h>]

=head1 DESCRIPTION

B<a2query> is a program designed to retrieve configuration values from a locally
available Apache 2 HTTP web server. It was designed to be as robust as possible
by returning feasible values even if the Apache 2 syntax validator fails.

This program is primarily meant to be used from maintainer scripts.

=head1 OPTIONS

=over 4

=item S<-a>

Returns the Apache 2 "Module Magic Version" (API version) number, the server was
compiled with. The returned version does not contain any minor versions which
are known to be compatible with the major version returned.

=item S<-c> [I<CONF>]

Checks whether the configuration I<CONF> is enabled. If no argument was given,
all enabled configuration files are being returned. I<CONF> is compared by
string comparison by ignoring a leading "mod_" prefix and possibly a '.conf' or
'.load' suffix.

=item S<-h>

Displays a brief summary how the program can be called and exits.

=item S<-m> [I<MODULE>]

Checks whether the module I<MODULE> is enabled, The argument is interpreted in
the same way, as for configuration files queried by the S<-c> switch.

=item S<-M>

Returns the currently enabled Apache 2 MPM (Multi Processing Module).

=item S<-s> [I<SITE>]

Checks whether the module I<SITE> is enabled, The argument is interpreted in
the same way, as for configuration files queried by the S<-c> switch.


=item S<-v>

returns the currently installed Apache 2 HTTP server version

=item S<-q>

suppress any output. This is useful to invoke a2query from another script. This
is useful if only the return code is of interest.

=back

=head1 EXIT CODES

B<a2query> returns with a zero (S<0>) exit status if the requested operation was
effectuated successfully and with a non-zero status otherwise. In case of an
error it leaves with error code S<32> if a requested module, site or
configuration was not found and S<33> if a module, site or configuration was
disabled by a maintainer script. However, exit status S<1> is returned if the
module was not found at all

=head1 SEE ALSO

L<apache2ctl>(8), L<apache2>(8), L<perl>(1)

=head1 AUTHOR

This manual and L<a2query> was written by Arno Toell <debian@toell.net>.

=cut

sub output
{
	print @_ unless $QUIET;
}

sub warning
{
	print STDERR @_ unless $QUIET;
}

sub fail
{
	die('usage: fail($reason, $retval)') if @_ != 2;
	my $reason = shift;
	my $retval = shift;
	warning "$reason\n";
	exit $retval;
}

sub load_defaults
{
	my @out = `$APACHE2 -V 2>/dev/null`;
	return if $?;
	foreach my $line (@out)
	{
		if ($line =~ m/(Server version|Server MPM|Magic Number):\s+(.*?)$/)
		{
			my ($pattern, $value) = ($1, $2);
			if ($pattern =~ /version/)
			{
				$SERVER_VERSION = $value;
				$SERVER_VERSION =~ s/[^\d\.]//g;
			}
			elsif ($pattern =~ /MPM/)
			{
				$MPM = $value;
			}
			elsif ($pattern =~ /Magic/)
			{
				$API = $value;
				$API =~ s/\:\d+//;
			}
		}
	}

}

sub load_modules
{
	my $conf_dir = $CONFIG_DIR . "/mods-enabled";
	opendir(DIR, $conf_dir) || fail("$conf_dir: $!", 1);
	while ( readdir(DIR) )
	{
		my $file = $_;
		next if $file !~ m/\.load$/;
		$file =~ s/\.load//;
		if ($file =~ /mpm_(event|worker|prefork)/)
		{
			$MPM = $1 if $MPM eq 'invalid';
			if (grep { $_ =~ m/^mpm_(?:event|worker|prefork)/ } @MODULES)
			{
				fail("There is more than one MPM loaded. Do not proceed due to undefined results", 1);
			}
		}
		push @MODULES, $file;
	}
	closedir(DIR);
}


sub load_conf
{
	if ($#CONFS >= 0)
	{
		return;
	}
	my $conf_dir = $CONFIG_DIR . "/conf-enabled";
	opendir(DIR, $conf_dir) || fail("$conf_dir: $!", 1);
	while ( readdir(DIR) )
	{
		my $file = $_;
		next if $file !~ m/\.conf$/;
		$file =~ s/\.conf$//;
		push @CONFS, $file;
	}
	closedir(DIR);
}


sub load_sites
{
	if ($#SITES >= 0)
	{
		return;
	}
	my $conf_dir = $CONFIG_DIR . "/sites-enabled";
	opendir(DIR, $conf_dir) || fail("$conf_dir: $!", 1);
	while ( readdir(DIR) )
	{
		my $file = $_;
		next if $file !~ m/\.conf$/;
		$file =~ s/\.conf$//;
		push @SITES, $file;
	}
	closedir(DIR);
}

sub switch_history
{
	die('usage: switch_history([module|site|conf], [enabled|disabled], $name)') if @_ != 3;
	my $which = shift;
	my $what = shift;
	my $name = shift;

	$name =~ s/\.conf$//;

	foreach my $state (@STATES)
	{
		my $state_token = "$STATE_DIR/$which/$what" . "_by_$state/" . $name;
		if (-e $state_token)
		{
			return $state;
		}
	}
	return 0;
}


sub query_state
{
	my $type    = shift;
	my $pattern = shift;
	my $listref = shift;

	$pattern =~ s/^mod//;
	$pattern =~ s/\.(conf|load)//;
	my @candidates;

	if ($pattern)
	{
		@candidates = grep { $_ eq $pattern } @{ $listref };
	}
	else
	{
		@candidates = @{ $listref }
	}

	my $matches = 0;
	foreach my $module (@candidates)
	{
		my $state = switch_history($type, "enabled", $module);
		if (!$state)
		{
			$state = "unknown";
		}
		output("$module (enabled by $verbose_state{$state})\n");
		$matches++;
	}
	if (!$matches)
	{
		my $reason = "No $type matches $pattern";
		my $retval = $E_NOTFOUND;
		my $state = switch_history($type, "disabled", $pattern);
		if ($state)
		{
			$reason .= " (disabled by $verbose_state{$state})";
			if ($state eq 'maint')
			{
				$retval = $E_OFFBYMAINT;
			}
			if ($state eq 'admin')
			{
				$retval = $E_OFFBYADMIN;
			}
		}
		fail($reason, $retval);
	}
}

load_defaults();
load_modules();

my %opts;
my $help = 1;
getopts('m:s:c:havMdq', \%opts);
#foreach my $key (keys %opts) { print("$key=$opts{$key}\n");}

push @HELP, ["q", "suppress any output. Useful for invocation from scripts"];
if (exists $opts{'q'})
{
	--$help;
	$QUIET=1;
}

push @HELP, ["m [MODULE]", "checks whether the module MODULE is enabled, lists all enabled modules if no argument was given"];
if (exists $opts{'m'})
{
	--$help;
	query_state('module', $opts{'m'}, \@MODULES);
}

push @HELP, ["s [SITE]", "checks whether the site SITE is enabled, lists all sites if no argument was given"];
if (exists $opts{'s'})
{
	--$help;
	load_sites();
	query_state('site', $opts{'s'}, \@SITES);
}


push @HELP, ["c [CONF]", "checks whether the configuration CONF is enabled, lists all configurations if no argument was given"];
if (exists $opts{'c'})
{
	--$help;
	load_conf();
	query_state('conf', $opts{'c'}, \@CONFS);
}


push @HELP, ["a", "returns the current Apache 2 module magic version"];
if (exists $opts{'a'})
{
	--$help;
	output("$API\n");
}


push @HELP, ["v", "returns the current Apache 2 version"];
if (exists $opts{'v'})
{
	--$help;
	output("$SERVER_VERSION\n");
}

push @HELP, ["M", "returns the enabled Apache 2 MPM"];
if (exists $opts{'M'})
{
	--$help;
	output("$MPM\n");
}

push @HELP, ["d", "returns the Apache 2 module directory"];
if (exists $opts{'d'})
{
	--$help;
	output("$MODULE_DIR\n");
}

push @HELP, ["h", "display this help"];
if (exists $opts{'h'} or $help == 1)
{
	my $usage = "$0 ";
	map { $usage .= "-$_->[0] " } @HELP;
	print("Usage: $usage\n");
	my $switch_name;
	my $description;
	format STDOUT =
@<<<<<<<<<<<<	^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
"-$switch_name",        $description,
~~	        ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
			$description,
.
	foreach my $switch (@HELP)
	{
		($switch_name, $description) = ($switch->[0], $switch->[1]);
		write STDOUT;
	}
	exit $E_OK;
}

# vim: syntax=perl sw=8 sts=8 sr noet