summaryrefslogtreecommitdiff
path: root/ext/pdo/pdo_sql_parser.re
blob: af6c278fef6dbe62f3650f4306904f00e18cb869 (plain)
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
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
/*
  +----------------------------------------------------------------------+
  | PHP Version 7                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2016 The PHP Group                                |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: George Schlossnagle <george@omniti.com>                      |
  +----------------------------------------------------------------------+
*/

/* $Id$ */

#include "php.h"
#include "php_pdo_driver.h"
#include "php_pdo_int.h"

#define PDO_PARSER_TEXT 1
#define PDO_PARSER_BIND 2
#define PDO_PARSER_BIND_POS 3
#define PDO_PARSER_EOI 4

#define RET(i) {s->cur = cursor; return i; }
#define SKIP_ONE(i) {s->cur = s->tok + 1; return i; }

#define YYCTYPE         unsigned char
#define YYCURSOR        cursor
#define YYLIMIT         s->end
#define YYMARKER        s->ptr
#define YYFILL(n)		{ RET(PDO_PARSER_EOI); }

typedef struct Scanner {
	char 	*ptr, *cur, *tok, *end;
} Scanner;

static int scan(Scanner *s)
{
	char *cursor = s->cur;

	s->tok = cursor;
	/*!re2c
	BINDCHR		= [:][a-zA-Z0-9_]+;
	QUESTION	= [?];
	COMMENTS	= ("/*"([^*]+|[*]+[^/*])*[*]*"*/"|"--"[^\r\n]*);
	SPECIALS	= [:?"'];
	MULTICHAR	= ([:]{2,}|[?]{2,});
	ANYNOEOF	= [\001-\377];
	*/

	/*!re2c
		(["](([\\]ANYNOEOF)|ANYNOEOF\["\\])*["]) { RET(PDO_PARSER_TEXT); }
		(['](([\\]ANYNOEOF)|ANYNOEOF\['\\])*[']) { RET(PDO_PARSER_TEXT); }
		MULTICHAR								{ RET(PDO_PARSER_TEXT); }
		BINDCHR									{ RET(PDO_PARSER_BIND); }
		QUESTION								{ RET(PDO_PARSER_BIND_POS); }
		SPECIALS								{ SKIP_ONE(PDO_PARSER_TEXT); }
		COMMENTS								{ RET(PDO_PARSER_TEXT); }
		(ANYNOEOF\SPECIALS)+ 					{ RET(PDO_PARSER_TEXT); }
	*/
}

struct placeholder {
	char *pos;
	size_t len;
	int bindno;
	size_t qlen;		/* quoted length of value */
	char *quoted;	/* quoted value */
	int freeq;
	struct placeholder *next;
};

static void free_param_name(zval *el) {
	efree(Z_PTR_P(el));
}

PDO_API int pdo_parse_params(pdo_stmt_t *stmt, char *inquery, size_t inquery_len,
	char **outquery, size_t *outquery_len)
{
	Scanner s;
	char *ptr, *newbuffer;
	int t;
	int bindno = 0;
	int ret = 0;
	size_t newbuffer_len;
	HashTable *params;
	struct pdo_bound_param_data *param;
	int query_type = PDO_PLACEHOLDER_NONE;
	struct placeholder *placeholders = NULL, *placetail = NULL, *plc = NULL;

	ptr = *outquery;
	s.cur = inquery;
	s.end = inquery + inquery_len + 1;

	/* phase 1: look for args */
	while((t = scan(&s)) != PDO_PARSER_EOI) {
		if (t == PDO_PARSER_BIND || t == PDO_PARSER_BIND_POS) {
			if (t == PDO_PARSER_BIND) {
				int len = s.cur - s.tok;
				if ((inquery < (s.cur - len)) && isalnum(*(s.cur - len - 1))) {
					continue;
				}
				query_type |= PDO_PLACEHOLDER_NAMED;
			} else {
				query_type |= PDO_PLACEHOLDER_POSITIONAL;
			}

			plc = emalloc(sizeof(*plc));
			memset(plc, 0, sizeof(*plc));
			plc->next = NULL;
			plc->pos = s.tok;
			plc->len = s.cur - s.tok;
			plc->bindno = bindno++;

			if (placetail) {
				placetail->next = plc;
			} else {
				placeholders = plc;
			}
			placetail = plc;
		}
	}

	if (bindno == 0) {
		/* nothing to do; good! */
		return 0;
	}

	/* did the query make sense to me? */
	if (query_type == (PDO_PLACEHOLDER_NAMED|PDO_PLACEHOLDER_POSITIONAL)) {
		/* they mixed both types; punt */
		pdo_raise_impl_error(stmt->dbh, stmt, "HY093", "mixed named and positional parameters");
		ret = -1;
		goto clean_up;
	}

	if (stmt->supports_placeholders == query_type && !stmt->named_rewrite_template) {
		/* query matches native syntax */
		ret = 0;
		goto clean_up;
	}

	if (stmt->named_rewrite_template) {
		/* magic/hack.
		 * We we pretend that the query was positional even if
		 * it was named so that we fall into the
		 * named rewrite case below.  Not too pretty,
		 * but it works. */
		query_type = PDO_PLACEHOLDER_POSITIONAL;
	}

	params = stmt->bound_params;

	/* Do we have placeholders but no bound params */
	if (bindno && !params && stmt->supports_placeholders == PDO_PLACEHOLDER_NONE) {
		pdo_raise_impl_error(stmt->dbh, stmt, "HY093", "no parameters were bound");
		ret = -1;
		goto clean_up;
	}

	if (params && bindno != zend_hash_num_elements(params) && stmt->supports_placeholders == PDO_PLACEHOLDER_NONE) {
		/* extra bit of validation for instances when same params are bound more than once */
		if (query_type != PDO_PLACEHOLDER_POSITIONAL && bindno > zend_hash_num_elements(params)) {
			int ok = 1;
			for (plc = placeholders; plc; plc = plc->next) {
				if ((param = zend_hash_str_find_ptr(params, plc->pos, plc->len)) == NULL) {
					ok = 0;
					break;
				}
			}
			if (ok) {
				goto safe;
			}
		}
		pdo_raise_impl_error(stmt->dbh, stmt, "HY093", "number of bound variables does not match number of tokens");
		ret = -1;
		goto clean_up;
	}
safe:
	/* what are we going to do ? */
	if (stmt->supports_placeholders == PDO_PLACEHOLDER_NONE) {
		/* query generation */

		newbuffer_len = inquery_len;

		/* let's quote all the values */
		for (plc = placeholders; plc; plc = plc->next) {
			if (query_type == PDO_PLACEHOLDER_POSITIONAL) {
				param = zend_hash_index_find_ptr(params, plc->bindno);
			} else {
				param = zend_hash_str_find_ptr(params, plc->pos, plc->len);
			}
			if (param == NULL) {
				/* parameter was not defined */
				ret = -1;
				pdo_raise_impl_error(stmt->dbh, stmt, "HY093", "parameter was not defined");
				goto clean_up;
			}
			if (stmt->dbh->methods->quoter) {
				zval *parameter;
				if (Z_ISREF(param->parameter)) {
					parameter = Z_REFVAL(param->parameter);
				} else {
					parameter = &param->parameter;
				}
				if (param->param_type == PDO_PARAM_LOB && Z_TYPE_P(parameter) == IS_RESOURCE) {
					php_stream *stm;

					php_stream_from_zval_no_verify(stm, parameter);
					if (stm) {
						zend_string *buf;

						buf = php_stream_copy_to_mem(stm, PHP_STREAM_COPY_ALL, 0);
						if (!buf) {
							buf = ZSTR_EMPTY_ALLOC();
						}
						if (!stmt->dbh->methods->quoter(stmt->dbh, ZSTR_VAL(buf), ZSTR_LEN(buf), &plc->quoted, &plc->qlen,
								param->param_type)) {
							/* bork */
							ret = -1;
							strncpy(stmt->error_code, stmt->dbh->error_code, 6);
							if (buf) {
								zend_string_release(buf);
							}
							goto clean_up;
						}
						if (buf) {
							zend_string_release(buf);
						}
					} else {
						pdo_raise_impl_error(stmt->dbh, stmt, "HY105", "Expected a stream resource");
						ret = -1;
						goto clean_up;
					}
					plc->freeq = 1;
				} else {
					zval tmp_param;
				   	ZVAL_DUP(&tmp_param, parameter);
					switch (Z_TYPE(tmp_param)) {
						case IS_NULL:
							plc->quoted = "NULL";
							plc->qlen = sizeof("NULL")-1;
							plc->freeq = 0;
							break;

						case IS_FALSE:
						case IS_TRUE:
							convert_to_long(&tmp_param);
							/* fall through */
						case IS_LONG:
						case IS_DOUBLE:
							convert_to_string(&tmp_param);
							plc->qlen = Z_STRLEN(tmp_param);
							plc->quoted = estrdup(Z_STRVAL(tmp_param));
							plc->freeq = 1;
							break;

						default:
							convert_to_string(&tmp_param);
							if (!stmt->dbh->methods->quoter(stmt->dbh, Z_STRVAL(tmp_param),
									Z_STRLEN(tmp_param), &plc->quoted, &plc->qlen,
									param->param_type)) {
								/* bork */
								ret = -1;
								strncpy(stmt->error_code, stmt->dbh->error_code, 6);
								goto clean_up;
							}
							plc->freeq = 1;
					}
					zval_dtor(&tmp_param);
				}
			} else {
				zval *parameter;
				if (Z_ISREF(param->parameter)) {
					parameter = Z_REFVAL(param->parameter);
				} else {
					parameter = &param->parameter;
				}
				plc->quoted = Z_STRVAL_P(parameter);
				plc->qlen = Z_STRLEN_P(parameter);
			}
			newbuffer_len += plc->qlen;
		}

rewrite:
		/* allocate output buffer */
		newbuffer = emalloc(newbuffer_len + 1);
		*outquery = newbuffer;

		/* and build the query */
		plc = placeholders;
		ptr = inquery;

		do {
			t = plc->pos - ptr;
			if (t) {
				memcpy(newbuffer, ptr, t);
				newbuffer += t;
			}
			memcpy(newbuffer, plc->quoted, plc->qlen);
			newbuffer += plc->qlen;
			ptr = plc->pos + plc->len;

			plc = plc->next;
		} while (plc);

		t = (inquery + inquery_len) - ptr;
		if (t) {
			memcpy(newbuffer, ptr, t);
			newbuffer += t;
		}
		*newbuffer = '\0';
		*outquery_len = newbuffer - *outquery;

		ret = 1;
		goto clean_up;

	} else if (query_type == PDO_PLACEHOLDER_POSITIONAL) {
		/* rewrite ? to :pdoX */
		char *name, *idxbuf;
		const char *tmpl = stmt->named_rewrite_template ? stmt->named_rewrite_template : ":pdo%d";
		int bind_no = 1;

		newbuffer_len = inquery_len;

		if (stmt->bound_param_map == NULL) {
			ALLOC_HASHTABLE(stmt->bound_param_map);
			zend_hash_init(stmt->bound_param_map, 13, NULL, free_param_name, 0);
		}

		for (plc = placeholders; plc; plc = plc->next) {
			int skip_map = 0;
			char *p;
			name = estrndup(plc->pos, plc->len);

			/* check if bound parameter is already available */
			if (!strcmp(name, "?") || (p = zend_hash_str_find_ptr(stmt->bound_param_map, name, plc->len)) == NULL) {
				spprintf(&idxbuf, 0, tmpl, bind_no++);
			} else {
				idxbuf = estrdup(p);
				skip_map = 1;
			}

			plc->quoted = idxbuf;
			plc->qlen = strlen(plc->quoted);
			plc->freeq = 1;
			newbuffer_len += plc->qlen;

			if (!skip_map && stmt->named_rewrite_template) {
				/* create a mapping */
				zend_hash_str_update_mem(stmt->bound_param_map, name, plc->len, idxbuf, plc->qlen + 1);
			}

			/* map number to name */
			zend_hash_index_update_mem(stmt->bound_param_map, plc->bindno, idxbuf, plc->qlen + 1);

			efree(name);
		}

		goto rewrite;

	} else {
		/* rewrite :name to ? */

		newbuffer_len = inquery_len;

		if (stmt->bound_param_map == NULL) {
			ALLOC_HASHTABLE(stmt->bound_param_map);
			zend_hash_init(stmt->bound_param_map, 13, NULL, free_param_name, 0);
		}

		for (plc = placeholders; plc; plc = plc->next) {
			char *name;
			name = estrndup(plc->pos, plc->len);
			zend_hash_index_update_mem(stmt->bound_param_map, plc->bindno, name, plc->len + 1);
			efree(name);
			plc->quoted = "?";
			plc->qlen = 1;
		}

		goto rewrite;
	}

clean_up:

	while (placeholders) {
		plc = placeholders;
		placeholders = plc->next;

		if (plc->freeq) {
			efree(plc->quoted);
		}

		efree(plc);
	}

	return ret;
}

#if 0
int old_pdo_parse_params(pdo_stmt_t *stmt, char *inquery, int inquery_len, char **outquery,
		int *outquery_len)
{
	Scanner s;
	char *ptr;
	int t;
	int bindno = 0;
	int newbuffer_len;
	int padding;
	HashTable *params = stmt->bound_params;
	struct pdo_bound_param_data *param;
	/* allocate buffer for query with expanded binds, ptr is our writing pointer */
	newbuffer_len = inquery_len;

	/* calculate the possible padding factor due to quoting */
	if(stmt->dbh->max_escaped_char_length) {
		padding = stmt->dbh->max_escaped_char_length;
	} else {
		padding = 3;
	}
	if(params) {
		ZEND_HASH_FOREACH_PTR(params, param) {
			if(param->parameter) {
				convert_to_string(param->parameter);
				/* accommodate a string that needs to be fully quoted
                   bind placeholders are at least 2 characters, so
                   the accommodate their own "'s
                */
				newbuffer_len += padding * Z_STRLEN_P(param->parameter);
			}
		} ZEND_HASH_FOREACH_END();
	}
	*outquery = (char *) emalloc(newbuffer_len + 1);
	*outquery_len = 0;

	ptr = *outquery;
	s.cur = inquery;
	while((t = scan(&s)) != PDO_PARSER_EOI) {
		if(t == PDO_PARSER_TEXT) {
			memcpy(ptr, s.tok, s.cur - s.tok);
			ptr += (s.cur - s.tok);
			*outquery_len += (s.cur - s.tok);
		}
		else if(t == PDO_PARSER_BIND) {
			if(!params) {
				/* error */
				efree(*outquery);
				*outquery = NULL;
				return (int) (s.cur - inquery);
			}
			/* lookup bind first via hash and then index */
			/* stupid keys need to be null-terminated, even though we know their length */
			if((NULL != (param = zend_hash_str_find_ptr(params, s.tok, s.cur-s.tok))
			    ||
			   NULL != (params = zend_hash_index_find_ptr(params, bindno)))
			{
				char *quotedstr;
				int quotedstrlen;
				/* restore the in-string key, doesn't need null-termination here */
				/* currently everything is a string here */

				/* quote the bind value if necessary */
				if(stmt->dbh->methods->quoter(stmt->dbh, Z_STRVAL_P(param->parameter),
					Z_STRLEN_P(param->parameter), &quotedstr, &quotedstrlen))
				{
					memcpy(ptr, quotedstr, quotedstrlen);
					ptr += quotedstrlen;
					*outquery_len += quotedstrlen;
					efree(quotedstr);
				} else {
					memcpy(ptr, Z_STRVAL_P(param->parameter), Z_STRLEN_P(param->parameter));
					ptr += Z_STRLEN_P(param->parameter);
					*outquery_len += (Z_STRLEN_P(param->parameter));
				}
			}
			else {
				/* error and cleanup */
				efree(*outquery);
				*outquery = NULL;
				return (int) (s.cur - inquery);
			}
			bindno++;
		}
		else if(t == PDO_PARSER_BIND_POS) {
			if(!params) {
				/* error */
				efree(*outquery);
				*outquery = NULL;
				return (int) (s.cur - inquery);
			}
			/* lookup bind by index */
			if(NULL != (params = zend_hash_index_find_ptr(params, bindno)))
			{
				char *quotedstr;
				int quotedstrlen;
				/* currently everything is a string here */

				/* quote the bind value if necessary */
				if(stmt->dbh->methods->quoter(stmt->dbh, Z_STRVAL_P(param->parameter),
					Z_STRLEN_P(param->parameter), &quotedstr, &quotedstrlen))
				{
					memcpy(ptr, quotedstr, quotedstrlen);
					ptr += quotedstrlen;
					*outquery_len += quotedstrlen;
					efree(quotedstr);
				} else {
					memcpy(ptr, Z_STRVAL_P(param->parameter), Z_STRLEN_P(param->parameter));
					ptr += Z_STRLEN_P(param->parameter);
					*outquery_len += (Z_STRLEN_P(param->parameter));
				}
			}
			else {
				/* error and cleanup */
				efree(*outquery);
				*outquery = NULL;
				return (int) (s.cur - inquery);
			}
			bindno++;
		}
	}
	*ptr = '\0';
	return 0;
}
#endif

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet sw=4 ts=4 fdm=marker ft=c
 * vim<600: noet sw=4 ts=4
 */