aboutsummaryrefslogtreecommitdiffstats
path: root/include/dba/dba_driver.php
blob: 4bad7032321e7ed4121265f551c0c900661147b9 (plain) (blame)
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
<?php
/**
 * @file dba_driver.php
 * @brief some database related functions and abstract driver class.
 *
 * This file contains the abstract database driver class dba_driver and some
 * functions for working with databases.
 */


class DBA {

	static public $dba = null;
	static public $dbtype = null;


	/**
	 * @brief Returns the database driver object.
	 *
	 * If available it will use PHP's mysqli otherwise mysql driver.
	 *
	 * @param string $server DB server name
	 * @param string $port DB port
	 * @param string $user DB username
	 * @param string $pass DB password
	 * @param string $db database name
	 * @param string $dbtype 0 for mysql, 1 for postgres
	 * @param bool $install Defaults to false
	 * @return null|dba_driver A database driver object (dba_mysql|dba_mysqli) or null if no driver found.
	 */
	
	function dba_factory($server, $port,$user,$pass,$db,$dbtype,$install = false) {
	
		self::$dba = null;

		self::$dbtype = intval($dbtype);

		if(self::$dbtype == DBTYPE_POSTGRES) {
			require_once('include/dba/dba_postgres.php');
			if(is_null($port)) $port = 5432;
			self::$dba = new dba_postgres($server, $port, $user, $pass, $db, $install);
		} 
		else {
			if(class_exists('mysqli')) {
				if (is_null($port)) $port = ini_get("mysqli.default_port");
				require_once('include/dba/dba_mysqli.php');
				self::$dba = new dba_mysqli($server, $port,$user,$pass,$db,$install);
			} 
			else {
				// UNSUPPORTED, OBSOLETE
				if (is_null($port)) $port = "3306";
				require_once('include/dba/dba_mysql.php');
				self::$dba = new dba_mysql($server, $port,$user,$pass,$db,$install);
			}
		}

		define('NULL_DATE', self::$dba->get_null_date());
		define('ACTIVE_DBTYPE', self::$dbtype);
		return self::$dba;
	}
}

/**
 * @brief abstract database driver class.
 *
 * This class gets extended by the real database driver classes, e.g. dba_mysql,
 * dba_mysqli.
 */

abstract class dba_driver {
	// legacy behavior
	const INSTALL_SCRIPT='install/schema_mysql.sql';
	const NULL_DATE = '0000-00-00 00:00:00';
	const UTC_NOW = 'UTC_TIMESTAMP()';

	protected $debug = 0;
	protected $db;
	public  $connected = false;
	public  $error = false;

	/**
	 * @brief Connect to the database.
	 *
	 * This abstract function needs to be implemented in the real driver.
	 *
	 * @param string $server DB server name
	 * @param string $port DB port
	 * @param string $user DB username
	 * @param string $pass DB password
	 * @param string $db database name
	 * @return bool
	 */
	abstract function connect($server, $port, $user, $pass, $db);

	/**
	 * @brief Perform a DB query with the SQL statement $sql.
	 *
	 * This abstract function needs to be implemented in the real driver.
	 *
	 * @param string $sql The SQL query to execute
	 */
	abstract function q($sql);

	/**
	 * @brief Escape a string before being passed to a DB query.
	 *
	 * This abstract function needs to be implemented in the real driver.
	 *
	 * @param string $str The string to escape.
	 */
	abstract function escape($str);

	/**
	 * @brief Close the database connection.
	 *
	 * This abstract function needs to be implemented in the real driver.
	 */
	abstract function close();

	/**
	 * @brief Return text name for db driver
	 *
	 * This abstract function needs to be implemented in the real driver.
	 */
	abstract function getdriver();

	function __construct($server, $port, $user,$pass,$db,$install = false) {
		if(($install) && (! $this->install($server, $port, $user, $pass, $db))) {
			return;
		}
		$this->connect($server, $port, $user, $pass, $db);
	}

	function get_null_date() {
		return static::NULL_DATE;
	}

	function get_install_script() {
		return static::INSTALL_SCRIPT;
	}

	function utcnow() {
		return static::UTC_NOW;
	}

	function install($server,$user,$pass,$db) {
		if (!(strlen($server) && strlen($user))){
			$this->connected = false;
			$this->db = null;
			return false;
		}

		if(strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
			if((! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) && (! filter_var($server, FILTER_VALIDATE_IP))) {
				$this->error = sprintf( t('Cannot locate DNS info for database server \'%s\''), $server);
				$this->connected = false;
				$this->db = null;
				return false;
			}
		}

		return true;
	}

	/**
	 * @brief Sets the database driver's debugging state.
	 *
	 * @param int $dbg 0 to disable debugging
	 */
	function dbg($dbg) {
		$this->debug = $dbg;
	}

	function __destruct() {
		if($this->db && $this->connected) {
			$this->close();
		}
	}

	function quote_interval($txt) {
		return $txt;
	}

	function optimize_table($table) {
		q('OPTIMIZE TABLE '.$table);
	}

	function concat($fld, $sep) {
		return 'GROUP_CONCAT(DISTINCT '.$fld.' SEPARATOR \''.$sep.'\')';
	}

	function escapebin($str) {
		return $this->escape($str);
	}

	function unescapebin($str) {
		return $str;
	}
} // end abstract dba_driver class



// Procedural functions

function printable($s) {
	$s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
	$s = str_replace("\x00",'.',$s);
	if(x($_SERVER,'SERVER_NAME'))
		$s = escape_tags($s);

	return $s;
}

/**
 * @brief set database driver debugging state.
 *
 * @param int $state 0 to disable debugging
 */
function dbg($state) {
//	global $db;

	if(DBA::$dba)
		DBA::$dba->dbg($state);
}

/**
 * @brief Escape strings being passed to DB queries.
 *
 * Always escape strings being used in DB queries. This function returns the
 * escaped string. Integer DB parameters should all be proven integers by
 * wrapping with intval().
 *
 * @param string $str A string to pass to a DB query
 * @return Return an escaped string of the value to pass to a DB query.
 */
function dbesc($str) {
	if(DBA::$dba && DBA::$dba->connected)
		return(DBA::$dba->escape($str));
	else
		return(str_replace("'", "\\'", $str));
}

function dbescbin($str) {
	global $db;
	return DBA::$dba->escapebin($str);
}

function dbunescbin($str) {
	global $db;
	return DBA::$dba->unescapebin($str);
}

function dbescdate($date) {
	if(ACTIVE_DBTYPE == DBTYPE_POSTGRES && $date == '0000-00-00 00:00:00') {
		$date = NULL_DATE;
	} else if(ACTIVE_DBTYPE != DBTYPE_POSTGRES && $date == '0001-01-01 00:00:00') {
		$date = NULL_DATE;
	}
	return $date;
}

function db_quoteinterval($txt) {
	global $db;
	return DBA::$dba->quote_interval($txt);
}

function dbesc_identifier($str) {
	global $db;
	return DBA::$dba->escape_identifier($str);
}

function db_utcnow() {
	global $db;
	return DBA::$dba->utcnow();
}

function db_optimizetable($table) {
	global $db;
	DBA::$dba->optimize_table($table);
}

function db_concat($fld, $sep) {
	global $db;
	return DBA::$dba->concat($fld, $sep);
}

// Function: q($sql,$args);
// Description: execute SQL query with printf style args.
// Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
//                   'user', 1);


/**
 * @brief Execute a SQL query with printf style args.
 *
 * printf style arguments %s and %d are replaced with variable arguments, which
 * should each be appropriately dbesc() or intval().
 * SELECT queries return an array of results or false if SQL or DB error. Other
 * queries return true if the command was successful or false if it wasn't.
 *
 * Example:
 *  $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
 *         'user', 1);
 *
 * @param string $sql The SQL query to execute
 * @return bool|array
 */
function q($sql) {
	global $db;

	$args = func_get_args();
	unset($args[0]);

	if(DBA::$dba && DBA::$dba->connected) {
		$stmt = vsprintf($sql, $args);
		if($stmt === false) {
			if(version_compare(PHP_VERSION, '5.4.0') >= 0)
				logger('dba: vsprintf error: ' .
					print_r(debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 1), true),LOGGER_NORMAL,LOG_CRIT);
			else
				logger('dba: vsprintf error: ' . print_r(debug_backtrace(), true),LOGGER_NORMAL,LOG_CRIT);
		}
		return DBA::$dba->q($stmt);
	}

	/*
	 * This will happen occasionally trying to store the 
	 * session data after abnormal program termination 
	 */
	logger('dba: no database: ' . print_r($args,true),LOGGER_NORMAL,LOG_CRIT);

	return false;
}

/**
 * @brief Raw DB query, no arguments.
 *
 * This function executes a raw DB query without any arguments.
 *
 * @param string $sql The SQL query to execute
 */
function dbq($sql) {
	global $db;

	if(DBA::$dba && DBA::$dba->connected)
		$ret = DBA::$dba->q($sql);
	else
		$ret = false;

	return $ret;
}



// Caller is responsible for ensuring that any integer arguments to
// dbesc_array are actually integers and not malformed strings containing
// SQL injection vectors. All integer array elements should be specifically 
// cast to int to avoid trouble. 

function dbesc_array_cb(&$item, $key) {
	if(is_string($item)) {
		if($item == '0000-00-00 00:00:00' && ACTIVE_DBTYPE == DBTYPE_POSTGRES)
			$item = '0001-01-01 00:00:00';
		else if($item == '0001-01-01 00:00:00' && ACTIVE_DBTYPE == DBTYPE_MYSQL)
			$item = '0000-00-00 00:00:00';

		$item = dbesc($item);
	}
}


function dbesc_array(&$arr) {
	if(is_array($arr) && count($arr)) {
		array_walk($arr,'dbesc_array_cb');
	}
}

function db_getfunc($f) {
	$lookup = array(
		'rand'=>array(
			DBTYPE_MYSQL=>'RAND()', 
			DBTYPE_POSTGRES=>'RANDOM()'
		),
		'utc_timestamp'=>array(
			DBTYPE_MYSQL=>'UTC_TIMESTAMP()',
			DBTYPE_POSTGRES=>"now() at time zone 'UTC'"
		),
		'regexp'=>array(
			DBTYPE_MYSQL=>'REGEXP',
			DBTYPE_POSTGRES=>'~'
		),
		'^'=>array(
			DBTYPE_MYSQL=>'^',
			DBTYPE_POSTGRES=>'#'
		)
	);
	$f = strtolower($f);
	if(isset($lookup[$f]) && isset($lookup[$f][ACTIVE_DBTYPE]))
		return $lookup[$f][ACTIVE_DBTYPE];

	logger('Unable to abstract DB function "'. $f . '" for dbtype ' . ACTIVE_DBTYPE, LOGGER_DEBUG, LOG_ERR);
	return $f;
}