1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Zeev Suraski <zeev@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 #include "php.h"
20 #include "php_browscap.h"
21 #include "php_ini.h"
22 #include "php_string.h"
23 #include "ext/pcre/php_pcre.h"
24
25 #include "zend_ini_scanner.h"
26 #include "zend_globals.h"
27
28 #define BROWSCAP_NUM_CONTAINS 5
29
30 typedef struct {
31 zend_string *key;
32 zend_string *value;
33 } browscap_kv;
34
35 typedef struct {
36 zend_string *pattern;
37 zend_string *parent;
38 uint32_t kv_start;
39 uint32_t kv_end;
40 /* We ensure that the length fits in 16 bits, so this is fine */
41 uint16_t contains_start[BROWSCAP_NUM_CONTAINS];
42 uint8_t contains_len[BROWSCAP_NUM_CONTAINS];
43 uint8_t prefix_len;
44 } browscap_entry;
45
46 typedef struct {
47 HashTable *htab;
48 browscap_kv *kv;
49 uint32_t kv_used;
50 uint32_t kv_size;
51 char filename[MAXPATHLEN];
52 } browser_data;
53
54 /* browser data defined in startup phase, eagerly loaded in MINIT */
55 static browser_data global_bdata = {0};
56
57 /* browser data defined in activation phase, lazily loaded in get_browser.
58 * Per request and per thread, if applicable */
ZEND_BEGIN_MODULE_GLOBALS(browscap)59 ZEND_BEGIN_MODULE_GLOBALS(browscap)
60 browser_data activation_bdata;
61 ZEND_END_MODULE_GLOBALS(browscap)
62
63 ZEND_DECLARE_MODULE_GLOBALS(browscap)
64 #define BROWSCAP_G(v) ZEND_MODULE_GLOBALS_ACCESSOR(browscap, v)
65
66 #define DEFAULT_SECTION_NAME "Default Browser Capability Settings"
67
68 /* OBJECTS_FIXME: This whole extension needs going through. The use of objects looks pretty broken here */
69
70 static void browscap_entry_dtor(zval *zvalue)
71 {
72 browscap_entry *entry = Z_PTR_P(zvalue);
73 zend_string_release_ex(entry->pattern, 0);
74 if (entry->parent) {
75 zend_string_release_ex(entry->parent, 0);
76 }
77 efree(entry);
78 }
79
browscap_entry_dtor_persistent(zval * zvalue)80 static void browscap_entry_dtor_persistent(zval *zvalue)
81 {
82 browscap_entry *entry = Z_PTR_P(zvalue);
83 zend_string_release_ex(entry->pattern, 1);
84 if (entry->parent) {
85 zend_string_release_ex(entry->parent, 1);
86 }
87 pefree(entry, 1);
88 }
89
is_placeholder(char c)90 static inline zend_bool is_placeholder(char c) {
91 return c == '?' || c == '*';
92 }
93
94 /* Length of prefix not containing any wildcards */
browscap_compute_prefix_len(zend_string * pattern)95 static uint8_t browscap_compute_prefix_len(zend_string *pattern) {
96 size_t i;
97 for (i = 0; i < ZSTR_LEN(pattern); i++) {
98 if (is_placeholder(ZSTR_VAL(pattern)[i])) {
99 break;
100 }
101 }
102 return (uint8_t)MIN(i, UINT8_MAX);
103 }
104
browscap_compute_contains(zend_string * pattern,size_t start_pos,uint16_t * contains_start,uint8_t * contains_len)105 static size_t browscap_compute_contains(
106 zend_string *pattern, size_t start_pos,
107 uint16_t *contains_start, uint8_t *contains_len) {
108 size_t i = start_pos;
109 /* Find first non-placeholder character after prefix */
110 for (; i < ZSTR_LEN(pattern); i++) {
111 if (!is_placeholder(ZSTR_VAL(pattern)[i])) {
112 /* Skip the case of a single non-placeholder character.
113 * Let's try to find something longer instead. */
114 if (i + 1 < ZSTR_LEN(pattern) &&
115 !is_placeholder(ZSTR_VAL(pattern)[i + 1])) {
116 break;
117 }
118 }
119 }
120 *contains_start = (uint16_t)i;
121
122 /* Find first placeholder character after that */
123 for (; i < ZSTR_LEN(pattern); i++) {
124 if (is_placeholder(ZSTR_VAL(pattern)[i])) {
125 break;
126 }
127 }
128 *contains_len = (uint8_t)MIN(i - *contains_start, UINT8_MAX);
129 return i;
130 }
131
132 /* Length of regex, including escapes, anchors, etc. */
browscap_compute_regex_len(zend_string * pattern)133 static size_t browscap_compute_regex_len(zend_string *pattern) {
134 size_t i, len = ZSTR_LEN(pattern);
135 for (i = 0; i < ZSTR_LEN(pattern); i++) {
136 switch (ZSTR_VAL(pattern)[i]) {
137 case '*':
138 case '.':
139 case '\\':
140 case '(':
141 case ')':
142 case '~':
143 case '+':
144 len++;
145 break;
146 }
147 }
148
149 return len + sizeof("~^$~")-1;
150 }
151
browscap_convert_pattern(zend_string * pattern,int persistent)152 static zend_string *browscap_convert_pattern(zend_string *pattern, int persistent) /* {{{ */
153 {
154 size_t i, j=0;
155 char *t;
156 zend_string *res;
157 char *lc_pattern;
158 ALLOCA_FLAG(use_heap);
159
160 res = zend_string_alloc(browscap_compute_regex_len(pattern), persistent);
161 t = ZSTR_VAL(res);
162
163 lc_pattern = do_alloca(ZSTR_LEN(pattern) + 1, use_heap);
164 zend_str_tolower_copy(lc_pattern, ZSTR_VAL(pattern), ZSTR_LEN(pattern));
165
166 t[j++] = '~';
167 t[j++] = '^';
168
169 for (i = 0; i < ZSTR_LEN(pattern); i++, j++) {
170 switch (lc_pattern[i]) {
171 case '?':
172 t[j] = '.';
173 break;
174 case '*':
175 t[j++] = '.';
176 t[j] = '*';
177 break;
178 case '.':
179 t[j++] = '\\';
180 t[j] = '.';
181 break;
182 case '\\':
183 t[j++] = '\\';
184 t[j] = '\\';
185 break;
186 case '(':
187 t[j++] = '\\';
188 t[j] = '(';
189 break;
190 case ')':
191 t[j++] = '\\';
192 t[j] = ')';
193 break;
194 case '~':
195 t[j++] = '\\';
196 t[j] = '~';
197 break;
198 case '+':
199 t[j++] = '\\';
200 t[j] = '+';
201 break;
202 default:
203 t[j] = lc_pattern[i];
204 break;
205 }
206 }
207
208 t[j++] = '$';
209 t[j++] = '~';
210 t[j]=0;
211
212 ZSTR_LEN(res) = j;
213 free_alloca(lc_pattern, use_heap);
214 return res;
215 }
216 /* }}} */
217
218 typedef struct _browscap_parser_ctx {
219 browser_data *bdata;
220 browscap_entry *current_entry;
221 zend_string *current_section_name;
222 HashTable str_interned;
223 } browscap_parser_ctx;
224
browscap_intern_str(browscap_parser_ctx * ctx,zend_string * str,zend_bool persistent)225 static zend_string *browscap_intern_str(
226 browscap_parser_ctx *ctx, zend_string *str, zend_bool persistent) {
227 zend_string *interned = zend_hash_find_ptr(&ctx->str_interned, str);
228 if (interned) {
229 zend_string_addref(interned);
230 } else {
231 interned = zend_string_copy(str);
232 if (persistent) {
233 interned = zend_new_interned_string(str);
234 }
235 zend_hash_add_new_ptr(&ctx->str_interned, interned, interned);
236 }
237
238 return interned;
239 }
240
browscap_intern_str_ci(browscap_parser_ctx * ctx,zend_string * str,zend_bool persistent)241 static zend_string *browscap_intern_str_ci(
242 browscap_parser_ctx *ctx, zend_string *str, zend_bool persistent) {
243 zend_string *lcname;
244 zend_string *interned;
245 ALLOCA_FLAG(use_heap);
246
247 ZSTR_ALLOCA_ALLOC(lcname, ZSTR_LEN(str), use_heap);
248 zend_str_tolower_copy(ZSTR_VAL(lcname), ZSTR_VAL(str), ZSTR_LEN(str));
249 interned = zend_hash_find_ptr(&ctx->str_interned, lcname);
250
251 if (interned) {
252 zend_string_addref(interned);
253 } else {
254 interned = zend_string_dup(lcname, persistent);
255 if (persistent) {
256 interned = zend_new_interned_string(interned);
257 }
258 zend_hash_add_new_ptr(&ctx->str_interned, interned, interned);
259 }
260
261 ZSTR_ALLOCA_FREE(lcname, use_heap);
262 return interned;
263 }
264
browscap_add_kv(browser_data * bdata,zend_string * key,zend_string * value,zend_bool persistent)265 static void browscap_add_kv(
266 browser_data *bdata, zend_string *key, zend_string *value, zend_bool persistent) {
267 if (bdata->kv_used == bdata->kv_size) {
268 bdata->kv_size *= 2;
269 bdata->kv = safe_perealloc(bdata->kv, sizeof(browscap_kv), bdata->kv_size, 0, persistent);
270 }
271
272 bdata->kv[bdata->kv_used].key = key;
273 bdata->kv[bdata->kv_used].value = value;
274 bdata->kv_used++;
275 }
276
browscap_entry_to_array(browser_data * bdata,browscap_entry * entry)277 static HashTable *browscap_entry_to_array(browser_data *bdata, browscap_entry *entry) {
278 zval tmp;
279 uint32_t i;
280
281 HashTable *ht = zend_new_array(8);
282
283 ZVAL_STR(&tmp, browscap_convert_pattern(entry->pattern, 0));
284 zend_hash_str_add(ht, "browser_name_regex", sizeof("browser_name_regex")-1, &tmp);
285
286 ZVAL_STR_COPY(&tmp, entry->pattern);
287 zend_hash_str_add(ht, "browser_name_pattern", sizeof("browser_name_pattern")-1, &tmp);
288
289 if (entry->parent) {
290 ZVAL_STR_COPY(&tmp, entry->parent);
291 zend_hash_str_add(ht, "parent", sizeof("parent")-1, &tmp);
292 }
293
294 for (i = entry->kv_start; i < entry->kv_end; i++) {
295 ZVAL_STR_COPY(&tmp, bdata->kv[i].value);
296 zend_hash_add(ht, bdata->kv[i].key, &tmp);
297 }
298
299 return ht;
300 }
301
php_browscap_parser_cb(zval * arg1,zval * arg2,zval * arg3,int callback_type,void * arg)302 static void php_browscap_parser_cb(zval *arg1, zval *arg2, zval *arg3, int callback_type, void *arg) /* {{{ */
303 {
304 browscap_parser_ctx *ctx = arg;
305 browser_data *bdata = ctx->bdata;
306 int persistent = GC_FLAGS(bdata->htab) & IS_ARRAY_PERSISTENT;
307
308 if (!arg1) {
309 return;
310 }
311
312 switch (callback_type) {
313 case ZEND_INI_PARSER_ENTRY:
314 if (ctx->current_entry != NULL && arg2) {
315 zend_string *new_key, *new_value;
316
317 /* Set proper value for true/false settings */
318 if ((Z_STRLEN_P(arg2) == 2 && !strncasecmp(Z_STRVAL_P(arg2), "on", sizeof("on") - 1)) ||
319 (Z_STRLEN_P(arg2) == 3 && !strncasecmp(Z_STRVAL_P(arg2), "yes", sizeof("yes") - 1)) ||
320 (Z_STRLEN_P(arg2) == 4 && !strncasecmp(Z_STRVAL_P(arg2), "true", sizeof("true") - 1))
321 ) {
322 new_value = ZSTR_CHAR('1');
323 } else if (
324 (Z_STRLEN_P(arg2) == 2 && !strncasecmp(Z_STRVAL_P(arg2), "no", sizeof("no") - 1)) ||
325 (Z_STRLEN_P(arg2) == 3 && !strncasecmp(Z_STRVAL_P(arg2), "off", sizeof("off") - 1)) ||
326 (Z_STRLEN_P(arg2) == 4 && !strncasecmp(Z_STRVAL_P(arg2), "none", sizeof("none") - 1)) ||
327 (Z_STRLEN_P(arg2) == 5 && !strncasecmp(Z_STRVAL_P(arg2), "false", sizeof("false") - 1))
328 ) {
329 new_value = ZSTR_EMPTY_ALLOC();
330 } else { /* Other than true/false setting */
331 new_value = browscap_intern_str(ctx, Z_STR_P(arg2), persistent);
332 }
333
334 if (!strcasecmp(Z_STRVAL_P(arg1), "parent")) {
335 /* parent entry can not be same as current section -> causes infinite loop! */
336 if (ctx->current_section_name != NULL &&
337 !strcasecmp(ZSTR_VAL(ctx->current_section_name), Z_STRVAL_P(arg2))
338 ) {
339 zend_error(E_CORE_ERROR, "Invalid browscap ini file: "
340 "'Parent' value cannot be same as the section name: %s "
341 "(in file %s)", ZSTR_VAL(ctx->current_section_name), INI_STR("browscap"));
342 return;
343 }
344
345 if (ctx->current_entry->parent) {
346 zend_string_release(ctx->current_entry->parent);
347 }
348
349 ctx->current_entry->parent = new_value;
350 } else {
351 new_key = browscap_intern_str_ci(ctx, Z_STR_P(arg1), persistent);
352 browscap_add_kv(bdata, new_key, new_value, persistent);
353 ctx->current_entry->kv_end = bdata->kv_used;
354 }
355 }
356 break;
357 case ZEND_INI_PARSER_SECTION:
358 {
359 browscap_entry *entry;
360 zend_string *pattern = Z_STR_P(arg1);
361 size_t pos;
362 int i;
363
364 if (ZSTR_LEN(pattern) > UINT16_MAX) {
365 php_error_docref(NULL, E_WARNING,
366 "Skipping excessively long pattern of length %zd", ZSTR_LEN(pattern));
367 break;
368 }
369
370 if (persistent) {
371 pattern = zend_new_interned_string(zend_string_copy(pattern));
372 if (ZSTR_IS_INTERNED(pattern)) {
373 Z_TYPE_FLAGS_P(arg1) = 0;
374 } else {
375 zend_string_release(pattern);
376 }
377 }
378
379 entry = ctx->current_entry
380 = pemalloc(sizeof(browscap_entry), persistent);
381 zend_hash_update_ptr(bdata->htab, pattern, entry);
382
383 if (ctx->current_section_name) {
384 zend_string_release(ctx->current_section_name);
385 }
386 ctx->current_section_name = zend_string_copy(pattern);
387
388 entry->pattern = zend_string_copy(pattern);
389 entry->kv_end = entry->kv_start = bdata->kv_used;
390 entry->parent = NULL;
391
392 pos = entry->prefix_len = browscap_compute_prefix_len(pattern);
393 for (i = 0; i < BROWSCAP_NUM_CONTAINS; i++) {
394 pos = browscap_compute_contains(pattern, pos,
395 &entry->contains_start[i], &entry->contains_len[i]);
396 }
397 break;
398 }
399 }
400 }
401 /* }}} */
402
str_interned_dtor(zval * zv)403 static void str_interned_dtor(zval *zv) {
404 zend_string_release(Z_STR_P(zv));
405 }
406
browscap_read_file(char * filename,browser_data * browdata,int persistent)407 static int browscap_read_file(char *filename, browser_data *browdata, int persistent) /* {{{ */
408 {
409 zend_file_handle fh;
410 browscap_parser_ctx ctx = {0};
411
412 if (filename == NULL || filename[0] == '\0') {
413 return FAILURE;
414 }
415
416 zend_stream_init_fp(&fh, VCWD_FOPEN(filename, "r"), filename);
417 if (!fh.handle.fp) {
418 zend_error(E_CORE_WARNING, "Cannot open '%s' for reading", filename);
419 return FAILURE;
420 }
421
422 browdata->htab = pemalloc(sizeof *browdata->htab, persistent);
423 zend_hash_init_ex(browdata->htab, 0, NULL,
424 persistent ? browscap_entry_dtor_persistent : browscap_entry_dtor, persistent, 0);
425
426 browdata->kv_size = 16 * 1024;
427 browdata->kv_used = 0;
428 browdata->kv = pemalloc(sizeof(browscap_kv) * browdata->kv_size, persistent);
429
430 /* Create parser context */
431 ctx.bdata = browdata;
432 ctx.current_entry = NULL;
433 ctx.current_section_name = NULL;
434 zend_hash_init(&ctx.str_interned, 8, NULL, str_interned_dtor, persistent);
435
436 zend_parse_ini_file(&fh, 1, ZEND_INI_SCANNER_RAW,
437 (zend_ini_parser_cb_t) php_browscap_parser_cb, &ctx);
438
439 /* Destroy parser context */
440 if (ctx.current_section_name) {
441 zend_string_release(ctx.current_section_name);
442 }
443 zend_hash_destroy(&ctx.str_interned);
444
445 return SUCCESS;
446 }
447 /* }}} */
448
449 #ifdef ZTS
browscap_globals_ctor(zend_browscap_globals * browscap_globals)450 static void browscap_globals_ctor(zend_browscap_globals *browscap_globals) /* {{{ */
451 {
452 browscap_globals->activation_bdata.htab = NULL;
453 browscap_globals->activation_bdata.kv = NULL;
454 browscap_globals->activation_bdata.filename[0] = '\0';
455 }
456 /* }}} */
457 #endif
458
browscap_bdata_dtor(browser_data * bdata,int persistent)459 static void browscap_bdata_dtor(browser_data *bdata, int persistent) /* {{{ */
460 {
461 if (bdata->htab != NULL) {
462 uint32_t i;
463
464 zend_hash_destroy(bdata->htab);
465 pefree(bdata->htab, persistent);
466 bdata->htab = NULL;
467
468 for (i = 0; i < bdata->kv_used; i++) {
469 zend_string_release(bdata->kv[i].key);
470 zend_string_release(bdata->kv[i].value);
471 }
472 pefree(bdata->kv, persistent);
473 bdata->kv = NULL;
474 }
475 bdata->filename[0] = '\0';
476 }
477 /* }}} */
478
479 /* {{{ PHP_INI_MH
480 */
PHP_INI_MH(OnChangeBrowscap)481 PHP_INI_MH(OnChangeBrowscap)
482 {
483 if (stage == PHP_INI_STAGE_STARTUP) {
484 /* value handled in browscap.c's MINIT */
485 return SUCCESS;
486 } else if (stage == PHP_INI_STAGE_ACTIVATE) {
487 browser_data *bdata = &BROWSCAP_G(activation_bdata);
488 if (bdata->filename[0] != '\0') {
489 browscap_bdata_dtor(bdata, 0);
490 }
491 if (VCWD_REALPATH(ZSTR_VAL(new_value), bdata->filename) == NULL) {
492 return FAILURE;
493 }
494 return SUCCESS;
495 }
496
497 return FAILURE;
498 }
499 /* }}} */
500
PHP_MINIT_FUNCTION(browscap)501 PHP_MINIT_FUNCTION(browscap) /* {{{ */
502 {
503 char *browscap = INI_STR("browscap");
504
505 #ifdef ZTS
506 ts_allocate_id(&browscap_globals_id, sizeof(browser_data), (ts_allocate_ctor) browscap_globals_ctor, NULL);
507 #endif
508 /* ctor call not really needed for non-ZTS */
509
510 if (browscap && browscap[0]) {
511 if (browscap_read_file(browscap, &global_bdata, 1) == FAILURE) {
512 return FAILURE;
513 }
514 }
515
516 return SUCCESS;
517 }
518 /* }}} */
519
PHP_RSHUTDOWN_FUNCTION(browscap)520 PHP_RSHUTDOWN_FUNCTION(browscap) /* {{{ */
521 {
522 browser_data *bdata = &BROWSCAP_G(activation_bdata);
523 if (bdata->filename[0] != '\0') {
524 browscap_bdata_dtor(bdata, 0);
525 }
526
527 return SUCCESS;
528 }
529 /* }}} */
530
PHP_MSHUTDOWN_FUNCTION(browscap)531 PHP_MSHUTDOWN_FUNCTION(browscap) /* {{{ */
532 {
533 browscap_bdata_dtor(&global_bdata, 1);
534
535 return SUCCESS;
536 }
537 /* }}} */
538
browscap_get_minimum_length(browscap_entry * entry)539 static inline size_t browscap_get_minimum_length(browscap_entry *entry) {
540 size_t len = entry->prefix_len;
541 int i;
542 for (i = 0; i < BROWSCAP_NUM_CONTAINS; i++) {
543 len += entry->contains_len[i];
544 }
545 return len;
546 }
547
browser_reg_compare(browscap_entry * entry,zend_string * agent_name,browscap_entry ** found_entry_ptr)548 static int browser_reg_compare(browscap_entry *entry, zend_string *agent_name, browscap_entry **found_entry_ptr) /* {{{ */
549 {
550 browscap_entry *found_entry = *found_entry_ptr;
551 ALLOCA_FLAG(use_heap)
552 zend_string *pattern_lc, *regex;
553 const char *cur;
554 int i;
555
556 pcre2_code *re;
557 pcre2_match_data *match_data;
558 uint32_t capture_count;
559 int rc;
560
561 /* Agent name too short */
562 if (ZSTR_LEN(agent_name) < browscap_get_minimum_length(entry)) {
563 return 0;
564 }
565
566 /* Quickly discard patterns where the prefix doesn't match. */
567 if (zend_binary_strcasecmp(
568 ZSTR_VAL(agent_name), entry->prefix_len,
569 ZSTR_VAL(entry->pattern), entry->prefix_len) != 0) {
570 return 0;
571 }
572
573 /* Lowercase the pattern, the agent name is already lowercase */
574 ZSTR_ALLOCA_ALLOC(pattern_lc, ZSTR_LEN(entry->pattern), use_heap);
575 zend_str_tolower_copy(ZSTR_VAL(pattern_lc), ZSTR_VAL(entry->pattern), ZSTR_LEN(entry->pattern));
576
577 /* Check if the agent contains the "contains" portions */
578 cur = ZSTR_VAL(agent_name) + entry->prefix_len;
579 for (i = 0; i < BROWSCAP_NUM_CONTAINS; i++) {
580 if (entry->contains_len[i] != 0) {
581 cur = zend_memnstr(cur,
582 ZSTR_VAL(pattern_lc) + entry->contains_start[i],
583 entry->contains_len[i],
584 ZSTR_VAL(agent_name) + ZSTR_LEN(agent_name));
585 if (!cur) {
586 ZSTR_ALLOCA_FREE(pattern_lc, use_heap);
587 return 0;
588 }
589 cur += entry->contains_len[i];
590 }
591 }
592
593 /* See if we have an exact match, if so, we're done... */
594 if (zend_string_equals(agent_name, pattern_lc)) {
595 *found_entry_ptr = entry;
596 ZSTR_ALLOCA_FREE(pattern_lc, use_heap);
597 return 1;
598 }
599
600 regex = browscap_convert_pattern(entry->pattern, 0);
601 re = pcre_get_compiled_regex(regex, &capture_count);
602 if (re == NULL) {
603 ZSTR_ALLOCA_FREE(pattern_lc, use_heap);
604 zend_string_release(regex);
605 return 0;
606 }
607
608 match_data = php_pcre_create_match_data(capture_count, re);
609 if (!match_data) {
610 ZSTR_ALLOCA_FREE(pattern_lc, use_heap);
611 zend_string_release(regex);
612 return 0;
613 }
614 rc = pcre2_match(re, (PCRE2_SPTR)ZSTR_VAL(agent_name), ZSTR_LEN(agent_name), 0, 0, match_data, php_pcre_mctx());
615 php_pcre_free_match_data(match_data);
616 if (PCRE2_ERROR_NOMATCH != rc) {
617 /* If we've found a possible browser, we need to do a comparison of the
618 number of characters changed in the user agent being checked versus
619 the previous match found and the current match. */
620 if (found_entry) {
621 size_t i, prev_len = 0, curr_len = 0;
622 zend_string *previous_match = found_entry->pattern;
623 zend_string *current_match = entry->pattern;
624
625 for (i = 0; i < ZSTR_LEN(previous_match); i++) {
626 switch (ZSTR_VAL(previous_match)[i]) {
627 case '?':
628 case '*':
629 /* do nothing, ignore these characters in the count */
630 break;
631
632 default:
633 ++prev_len;
634 }
635 }
636
637 for (i = 0; i < ZSTR_LEN(current_match); i++) {
638 switch (ZSTR_VAL(current_match)[i]) {
639 case '?':
640 case '*':
641 /* do nothing, ignore these characters in the count */
642 break;
643
644 default:
645 ++curr_len;
646 }
647 }
648
649 /* Pick which browser pattern replaces the least amount of
650 characters when compared to the original user agent string... */
651 if (prev_len < curr_len) {
652 *found_entry_ptr = entry;
653 }
654 } else {
655 *found_entry_ptr = entry;
656 }
657 }
658
659 ZSTR_ALLOCA_FREE(pattern_lc, use_heap);
660 zend_string_release(regex);
661 return 0;
662 }
663 /* }}} */
664
browscap_zval_copy_ctor(zval * p)665 static void browscap_zval_copy_ctor(zval *p) /* {{{ */
666 {
667 if (Z_REFCOUNTED_P(p)) {
668 zend_string *str;
669
670 ZEND_ASSERT(Z_TYPE_P(p) == IS_STRING);
671 str = Z_STR_P(p);
672 if (!(GC_FLAGS(str) & GC_PERSISTENT)) {
673 GC_ADDREF(str);
674 } else {
675 ZVAL_NEW_STR(p, zend_string_init(ZSTR_VAL(str), ZSTR_LEN(str), 0));
676 }
677 }
678 }
679 /* }}} */
680
681 /* {{{ proto mixed get_browser([string browser_name [, bool return_array]])
682 Get information about the capabilities of a browser. If browser_name is omitted or null, HTTP_USER_AGENT is used. Returns an object by default; if return_array is true, returns an array. */
PHP_FUNCTION(get_browser)683 PHP_FUNCTION(get_browser)
684 {
685 zend_string *agent_name = NULL, *lookup_browser_name;
686 zend_bool return_array = 0;
687 browser_data *bdata;
688 browscap_entry *found_entry = NULL;
689 HashTable *agent_ht;
690
691 if (BROWSCAP_G(activation_bdata).filename[0] != '\0') {
692 bdata = &BROWSCAP_G(activation_bdata);
693 if (bdata->htab == NULL) { /* not initialized yet */
694 if (browscap_read_file(bdata->filename, bdata, 0) == FAILURE) {
695 RETURN_FALSE;
696 }
697 }
698 } else {
699 if (!global_bdata.htab) {
700 php_error_docref(NULL, E_WARNING, "browscap ini directive not set");
701 RETURN_FALSE;
702 }
703 bdata = &global_bdata;
704 }
705
706 ZEND_PARSE_PARAMETERS_START(0, 2)
707 Z_PARAM_OPTIONAL
708 Z_PARAM_STR_EX(agent_name, 1, 0)
709 Z_PARAM_BOOL(return_array)
710 ZEND_PARSE_PARAMETERS_END();
711
712 if (agent_name == NULL) {
713 zval *http_user_agent = NULL;
714 if (Z_TYPE(PG(http_globals)[TRACK_VARS_SERVER]) == IS_ARRAY
715 || zend_is_auto_global_str(ZEND_STRL("_SERVER"))) {
716 http_user_agent = zend_hash_str_find(
717 Z_ARRVAL_P(&PG(http_globals)[TRACK_VARS_SERVER]),
718 "HTTP_USER_AGENT", sizeof("HTTP_USER_AGENT")-1);
719 }
720 if (http_user_agent == NULL) {
721 php_error_docref(NULL, E_WARNING, "HTTP_USER_AGENT variable is not set, cannot determine user agent name");
722 RETURN_FALSE;
723 }
724 agent_name = Z_STR_P(http_user_agent);
725 }
726
727 lookup_browser_name = zend_string_tolower(agent_name);
728 found_entry = zend_hash_find_ptr(bdata->htab, lookup_browser_name);
729 if (found_entry == NULL) {
730 browscap_entry *entry;
731
732 ZEND_HASH_FOREACH_PTR(bdata->htab, entry) {
733 if (browser_reg_compare(entry, lookup_browser_name, &found_entry)) {
734 break;
735 }
736 } ZEND_HASH_FOREACH_END();
737
738 if (found_entry == NULL) {
739 found_entry = zend_hash_str_find_ptr(bdata->htab,
740 DEFAULT_SECTION_NAME, sizeof(DEFAULT_SECTION_NAME)-1);
741 if (found_entry == NULL) {
742 zend_string_release(lookup_browser_name);
743 RETURN_FALSE;
744 }
745 }
746 }
747
748 agent_ht = browscap_entry_to_array(bdata, found_entry);
749
750 if (return_array) {
751 RETVAL_ARR(agent_ht);
752 } else {
753 object_and_properties_init(return_value, zend_standard_class_def, agent_ht);
754 }
755
756 while (found_entry->parent) {
757 found_entry = zend_hash_find_ptr(bdata->htab, found_entry->parent);
758 if (found_entry == NULL) {
759 break;
760 }
761
762 agent_ht = browscap_entry_to_array(bdata, found_entry);
763 if (return_array) {
764 zend_hash_merge(Z_ARRVAL_P(return_value), agent_ht, (copy_ctor_func_t) browscap_zval_copy_ctor, 0);
765 } else {
766 zend_hash_merge(Z_OBJPROP_P(return_value), agent_ht, (copy_ctor_func_t) browscap_zval_copy_ctor, 0);
767 }
768
769 zend_hash_destroy(agent_ht);
770 efree(agent_ht);
771 }
772
773 zend_string_release_ex(lookup_browser_name, 0);
774 }
775 /* }}} */
776
