1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 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 | Authors: Wez Furlong <wez@thebrainroom.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 #include "php.h"
22 #include "php_globals.h"
23 #include "php_network.h"
24 #include "php_open_temporary_file.h"
25 #include "ext/standard/file.h"
26 #include <stddef.h>
27 #include <fcntl.h>
28
29 #include "php_streams_int.h"
30
31 /* Global filter hash, copied to FG(stream_filters) on registration of volatile filter */
32 static HashTable stream_filters_hash;
33
34 /* Should only be used during core initialization */
php_get_stream_filters_hash_global(void)35 PHPAPI HashTable *php_get_stream_filters_hash_global(void)
36 {
37 return &stream_filters_hash;
38 }
39
40 /* Normal hash selection/retrieval call */
_php_get_stream_filters_hash(TSRMLS_D)41 PHPAPI HashTable *_php_get_stream_filters_hash(TSRMLS_D)
42 {
43 return (FG(stream_filters) ? FG(stream_filters) : &stream_filters_hash);
44 }
45
46 /* API for registering GLOBAL filters */
php_stream_filter_register_factory(const char * filterpattern,php_stream_filter_factory * factory TSRMLS_DC)47 PHPAPI int php_stream_filter_register_factory(const char *filterpattern, php_stream_filter_factory *factory TSRMLS_DC)
48 {
49 return zend_hash_add(&stream_filters_hash, (char*)filterpattern, strlen(filterpattern) + 1, factory, sizeof(*factory), NULL);
50 }
51
php_stream_filter_unregister_factory(const char * filterpattern TSRMLS_DC)52 PHPAPI int php_stream_filter_unregister_factory(const char *filterpattern TSRMLS_DC)
53 {
54 return zend_hash_del(&stream_filters_hash, (char*)filterpattern, strlen(filterpattern) + 1);
55 }
56
57 /* API for registering VOLATILE wrappers */
php_stream_filter_register_factory_volatile(const char * filterpattern,php_stream_filter_factory * factory TSRMLS_DC)58 PHPAPI int php_stream_filter_register_factory_volatile(const char *filterpattern, php_stream_filter_factory *factory TSRMLS_DC)
59 {
60 if (!FG(stream_filters)) {
61 php_stream_filter_factory tmpfactory;
62
63 ALLOC_HASHTABLE(FG(stream_filters));
64 zend_hash_init(FG(stream_filters), zend_hash_num_elements(&stream_filters_hash), NULL, NULL, 1);
65 zend_hash_copy(FG(stream_filters), &stream_filters_hash, NULL, &tmpfactory, sizeof(php_stream_filter_factory));
66 }
67
68 return zend_hash_add(FG(stream_filters), (char*)filterpattern, strlen(filterpattern) + 1, factory, sizeof(*factory), NULL);
69 }
70
71 /* Buckets */
72
php_stream_bucket_new(php_stream * stream,char * buf,size_t buflen,int own_buf,int buf_persistent TSRMLS_DC)73 PHPAPI php_stream_bucket *php_stream_bucket_new(php_stream *stream, char *buf, size_t buflen, int own_buf, int buf_persistent TSRMLS_DC)
74 {
75 int is_persistent = php_stream_is_persistent(stream);
76 php_stream_bucket *bucket;
77
78 bucket = (php_stream_bucket*)pemalloc(sizeof(php_stream_bucket), is_persistent);
79
80 if (bucket == NULL) {
81 return NULL;
82 }
83
84 bucket->next = bucket->prev = NULL;
85
86 if (is_persistent && !buf_persistent) {
87 /* all data in a persistent bucket must also be persistent */
88 bucket->buf = pemalloc(buflen, 1);
89
90 if (bucket->buf == NULL) {
91 pefree(bucket, 1);
92 return NULL;
93 }
94
95 memcpy(bucket->buf, buf, buflen);
96 bucket->buflen = buflen;
97 bucket->own_buf = 1;
98 } else {
99 bucket->buf = buf;
100 bucket->buflen = buflen;
101 bucket->own_buf = own_buf;
102 }
103 bucket->is_persistent = is_persistent;
104 bucket->refcount = 1;
105 bucket->brigade = NULL;
106
107 return bucket;
108 }
109
110 /* Given a bucket, returns a version of that bucket with a writeable buffer.
111 * If the original bucket has a refcount of 1 and owns its buffer, then it
112 * is returned unchanged.
113 * Otherwise, a copy of the buffer is made.
114 * In both cases, the original bucket is unlinked from its brigade.
115 * If a copy is made, the original bucket is delref'd.
116 * */
php_stream_bucket_make_writeable(php_stream_bucket * bucket TSRMLS_DC)117 PHPAPI php_stream_bucket *php_stream_bucket_make_writeable(php_stream_bucket *bucket TSRMLS_DC)
118 {
119 php_stream_bucket *retval;
120
121 php_stream_bucket_unlink(bucket TSRMLS_CC);
122
123 if (bucket->refcount == 1 && bucket->own_buf) {
124 return bucket;
125 }
126
127 retval = (php_stream_bucket*)pemalloc(sizeof(php_stream_bucket), bucket->is_persistent);
128 memcpy(retval, bucket, sizeof(*retval));
129
130 retval->buf = pemalloc(retval->buflen, retval->is_persistent);
131 memcpy(retval->buf, bucket->buf, retval->buflen);
132
133 retval->refcount = 1;
134 retval->own_buf = 1;
135
136 php_stream_bucket_delref(bucket TSRMLS_CC);
137
138 return retval;
139 }
140
php_stream_bucket_split(php_stream_bucket * in,php_stream_bucket ** left,php_stream_bucket ** right,size_t length TSRMLS_DC)141 PHPAPI int php_stream_bucket_split(php_stream_bucket *in, php_stream_bucket **left, php_stream_bucket **right, size_t length TSRMLS_DC)
142 {
143 *left = (php_stream_bucket*)pecalloc(1, sizeof(php_stream_bucket), in->is_persistent);
144 *right = (php_stream_bucket*)pecalloc(1, sizeof(php_stream_bucket), in->is_persistent);
145
146 if (*left == NULL || *right == NULL) {
147 goto exit_fail;
148 }
149
150 (*left)->buf = pemalloc(length, in->is_persistent);
151 (*left)->buflen = length;
152 memcpy((*left)->buf, in->buf, length);
153 (*left)->refcount = 1;
154 (*left)->own_buf = 1;
155 (*left)->is_persistent = in->is_persistent;
156
157 (*right)->buflen = in->buflen - length;
158 (*right)->buf = pemalloc((*right)->buflen, in->is_persistent);
159 memcpy((*right)->buf, in->buf + length, (*right)->buflen);
160 (*right)->refcount = 1;
161 (*right)->own_buf = 1;
162 (*right)->is_persistent = in->is_persistent;
163
164 return SUCCESS;
165
166 exit_fail:
167 if (*right) {
168 if ((*right)->buf) {
169 pefree((*right)->buf, in->is_persistent);
170 }
171 pefree(*right, in->is_persistent);
172 }
173 if (*left) {
174 if ((*left)->buf) {
175 pefree((*left)->buf, in->is_persistent);
176 }
177 pefree(*left, in->is_persistent);
178 }
179 return FAILURE;
180 }
181
php_stream_bucket_delref(php_stream_bucket * bucket TSRMLS_DC)182 PHPAPI void php_stream_bucket_delref(php_stream_bucket *bucket TSRMLS_DC)
183 {
184 if (--bucket->refcount == 0) {
185 if (bucket->own_buf) {
186 pefree(bucket->buf, bucket->is_persistent);
187 }
188 pefree(bucket, bucket->is_persistent);
189 }
190 }
191
php_stream_bucket_prepend(php_stream_bucket_brigade * brigade,php_stream_bucket * bucket TSRMLS_DC)192 PHPAPI void php_stream_bucket_prepend(php_stream_bucket_brigade *brigade, php_stream_bucket *bucket TSRMLS_DC)
193 {
194 bucket->next = brigade->head;
195 bucket->prev = NULL;
196
197 if (brigade->head) {
198 brigade->head->prev = bucket;
199 } else {
200 brigade->tail = bucket;
201 }
202 brigade->head = bucket;
203 bucket->brigade = brigade;
204 }
205
php_stream_bucket_append(php_stream_bucket_brigade * brigade,php_stream_bucket * bucket TSRMLS_DC)206 PHPAPI void php_stream_bucket_append(php_stream_bucket_brigade *brigade, php_stream_bucket *bucket TSRMLS_DC)
207 {
208 if (brigade->tail == bucket) {
209 return;
210 }
211
212 bucket->prev = brigade->tail;
213 bucket->next = NULL;
214
215 if (brigade->tail) {
216 brigade->tail->next = bucket;
217 } else {
218 brigade->head = bucket;
219 }
220 brigade->tail = bucket;
221 bucket->brigade = brigade;
222 }
223
php_stream_bucket_unlink(php_stream_bucket * bucket TSRMLS_DC)224 PHPAPI void php_stream_bucket_unlink(php_stream_bucket *bucket TSRMLS_DC)
225 {
226 if (bucket->prev) {
227 bucket->prev->next = bucket->next;
228 } else if (bucket->brigade) {
229 bucket->brigade->head = bucket->next;
230 }
231 if (bucket->next) {
232 bucket->next->prev = bucket->prev;
233 } else if (bucket->brigade) {
234 bucket->brigade->tail = bucket->prev;
235 }
236 bucket->brigade = NULL;
237 bucket->next = bucket->prev = NULL;
238 }
239
240
241
242
243
244
245
246
247 /* We allow very simple pattern matching for filter factories:
248 * if "convert.charset.utf-8/sjis" is requested, we search first for an exact
249 * match. If that fails, we try "convert.charset.*", then "convert.*"
250 * This means that we don't need to clog up the hashtable with a zillion
251 * charsets (for example) but still be able to provide them all as filters */
php_stream_filter_create(const char * filtername,zval * filterparams,int persistent TSRMLS_DC)252 PHPAPI php_stream_filter *php_stream_filter_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
253 {
254 HashTable *filter_hash = (FG(stream_filters) ? FG(stream_filters) : &stream_filters_hash);
255 php_stream_filter_factory *factory = NULL;
256 php_stream_filter *filter = NULL;
257 int n;
258 char *period;
259
260 n = strlen(filtername);
261
262 if (SUCCESS == zend_hash_find(filter_hash, (char*)filtername, n + 1, (void**)&factory)) {
263 filter = factory->create_filter(filtername, filterparams, persistent TSRMLS_CC);
264 } else if ((period = strrchr(filtername, '.'))) {
265 /* try a wildcard */
266 char *wildname;
267
268 wildname = emalloc(n+3);
269 memcpy(wildname, filtername, n+1);
270 period = wildname + (period - filtername);
271 while (period && !filter) {
272 *period = '\0';
273 strncat(wildname, ".*", 2);
274 if (SUCCESS == zend_hash_find(filter_hash, wildname, strlen(wildname) + 1, (void**)&factory)) {
275 filter = factory->create_filter(filtername, filterparams, persistent TSRMLS_CC);
276 }
277
278 *period = '\0';
279 period = strrchr(wildname, '.');
280 }
281 efree(wildname);
282 }
283
284 if (filter == NULL) {
285 /* TODO: these need correct docrefs */
286 if (factory == NULL)
287 php_error_docref(NULL TSRMLS_CC, E_WARNING, "unable to locate filter \"%s\"", filtername);
288 else
289 php_error_docref(NULL TSRMLS_CC, E_WARNING, "unable to create or locate filter \"%s\"", filtername);
290 }
291
292 return filter;
293 }
294
_php_stream_filter_alloc(php_stream_filter_ops * fops,void * abstract,int persistent STREAMS_DC TSRMLS_DC)295 PHPAPI php_stream_filter *_php_stream_filter_alloc(php_stream_filter_ops *fops, void *abstract, int persistent STREAMS_DC TSRMLS_DC)
296 {
297 php_stream_filter *filter;
298
299 filter = (php_stream_filter*) pemalloc_rel_orig(sizeof(php_stream_filter), persistent);
300 memset(filter, 0, sizeof(php_stream_filter));
301
302 filter->fops = fops;
303 filter->abstract = abstract;
304 filter->is_persistent = persistent;
305
306 return filter;
307 }
308
php_stream_filter_free(php_stream_filter * filter TSRMLS_DC)309 PHPAPI void php_stream_filter_free(php_stream_filter *filter TSRMLS_DC)
310 {
311 if (filter->fops->dtor)
312 filter->fops->dtor(filter TSRMLS_CC);
313 pefree(filter, filter->is_persistent);
314 }
315
php_stream_filter_prepend_ex(php_stream_filter_chain * chain,php_stream_filter * filter TSRMLS_DC)316 PHPAPI int php_stream_filter_prepend_ex(php_stream_filter_chain *chain, php_stream_filter *filter TSRMLS_DC)
317 {
318 filter->next = chain->head;
319 filter->prev = NULL;
320
321 if (chain->head) {
322 chain->head->prev = filter;
323 } else {
324 chain->tail = filter;
325 }
326 chain->head = filter;
327 filter->chain = chain;
328
329 return SUCCESS;
330 }
331
_php_stream_filter_prepend(php_stream_filter_chain * chain,php_stream_filter * filter TSRMLS_DC)332 PHPAPI void _php_stream_filter_prepend(php_stream_filter_chain *chain, php_stream_filter *filter TSRMLS_DC)
333 {
334 php_stream_filter_prepend_ex(chain, filter TSRMLS_CC);
335 }
336
php_stream_filter_append_ex(php_stream_filter_chain * chain,php_stream_filter * filter TSRMLS_DC)337 PHPAPI int php_stream_filter_append_ex(php_stream_filter_chain *chain, php_stream_filter *filter TSRMLS_DC)
338 {
339 php_stream *stream = chain->stream;
340
341 filter->prev = chain->tail;
342 filter->next = NULL;
343 if (chain->tail) {
344 chain->tail->next = filter;
345 } else {
346 chain->head = filter;
347 }
348 chain->tail = filter;
349 filter->chain = chain;
350
351 if (&(stream->readfilters) == chain && (stream->writepos - stream->readpos) > 0) {
352 /* Let's going ahead and wind anything in the buffer through this filter */
353 php_stream_bucket_brigade brig_in = { NULL, NULL }, brig_out = { NULL, NULL };
354 php_stream_bucket_brigade *brig_inp = &brig_in, *brig_outp = &brig_out;
355 php_stream_filter_status_t status;
356 php_stream_bucket *bucket;
357 size_t consumed = 0;
358
359 bucket = php_stream_bucket_new(stream, (char*) stream->readbuf + stream->readpos, stream->writepos - stream->readpos, 0, 0 TSRMLS_CC);
360 php_stream_bucket_append(brig_inp, bucket TSRMLS_CC);
361 status = filter->fops->filter(stream, filter, brig_inp, brig_outp, &consumed, PSFS_FLAG_NORMAL TSRMLS_CC);
362
363 if (stream->readpos + consumed > (uint)stream->writepos) {
364 /* No behaving filter should cause this. */
365 status = PSFS_ERR_FATAL;
366 }
367
368 switch (status) {
369 case PSFS_ERR_FATAL:
370 while (brig_in.head) {
371 bucket = brig_in.head;
372 php_stream_bucket_unlink(bucket TSRMLS_CC);
373 php_stream_bucket_delref(bucket TSRMLS_CC);
374 }
375 while (brig_out.head) {
376 bucket = brig_out.head;
377 php_stream_bucket_unlink(bucket TSRMLS_CC);
378 php_stream_bucket_delref(bucket TSRMLS_CC);
379 }
380 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Filter failed to process pre-buffered data");
381 return FAILURE;
382 case PSFS_FEED_ME:
383 /* We don't actually need data yet,
384 leave this filter in a feed me state until data is needed.
385 Reset stream's internal read buffer since the filter is "holding" it. */
386 stream->readpos = 0;
387 stream->writepos = 0;
388 break;
389 case PSFS_PASS_ON:
390 /* If any data is consumed, we cannot rely upon the existing read buffer,
391 as the filtered data must replace the existing data, so invalidate the cache */
392 /* note that changes here should be reflected in
393 main/streams/streams.c::php_stream_fill_read_buffer */
394 stream->writepos = 0;
395 stream->readpos = 0;
396
397 while (brig_outp->head) {
398 bucket = brig_outp->head;
399 /* Grow buffer to hold this bucket if need be.
400 TODO: See warning in main/stream/streams.c::php_stream_fill_read_buffer */
401 if (stream->readbuflen - stream->writepos < bucket->buflen) {
402 stream->readbuflen += bucket->buflen;
403 stream->readbuf = perealloc(stream->readbuf, stream->readbuflen, stream->is_persistent);
404 }
405 memcpy(stream->readbuf + stream->writepos, bucket->buf, bucket->buflen);
406 stream->writepos += bucket->buflen;
407
408 php_stream_bucket_unlink(bucket TSRMLS_CC);
409 php_stream_bucket_delref(bucket TSRMLS_CC);
410 }
411 break;
412 }
413 }
414
415 return SUCCESS;
416 }
417
_php_stream_filter_append(php_stream_filter_chain * chain,php_stream_filter * filter TSRMLS_DC)418 PHPAPI void _php_stream_filter_append(php_stream_filter_chain *chain, php_stream_filter *filter TSRMLS_DC)
419 {
420 if (php_stream_filter_append_ex(chain, filter TSRMLS_CC) != SUCCESS) {
421 if (chain->head == filter) {
422 chain->head = NULL;
423 chain->tail = NULL;
424 } else {
425 filter->prev->next = NULL;
426 chain->tail = filter->prev;
427 }
428 }
429 }
430
_php_stream_filter_flush(php_stream_filter * filter,int finish TSRMLS_DC)431 PHPAPI int _php_stream_filter_flush(php_stream_filter *filter, int finish TSRMLS_DC)
432 {
433 php_stream_bucket_brigade brig_a = { NULL, NULL }, brig_b = { NULL, NULL }, *inp = &brig_a, *outp = &brig_b, *brig_temp;
434 php_stream_bucket *bucket;
435 php_stream_filter_chain *chain;
436 php_stream_filter *current;
437 php_stream *stream;
438 size_t flushed_size = 0;
439 long flags = (finish ? PSFS_FLAG_FLUSH_CLOSE : PSFS_FLAG_FLUSH_INC);
440
441 if (!filter->chain || !filter->chain->stream) {
442 /* Filter is not attached to a chain, or chain is somehow not part of a stream */
443 return FAILURE;
444 }
445
446 chain = filter->chain;
447 stream = chain->stream;
448
449 for(current = filter; current; current = current->next) {
450 php_stream_filter_status_t status;
451
452 status = filter->fops->filter(stream, current, inp, outp, NULL, flags TSRMLS_CC);
453 if (status == PSFS_FEED_ME) {
454 /* We've flushed the data far enough */
455 return SUCCESS;
456 }
457 if (status == PSFS_ERR_FATAL) {
458 return FAILURE;
459 }
460 /* Otherwise we have data available to PASS_ON
461 Swap the brigades and continue */
462 brig_temp = inp;
463 inp = outp;
464 outp = brig_temp;
465 outp->head = NULL;
466 outp->tail = NULL;
467
468 flags = PSFS_FLAG_NORMAL;
469 }
470
471 /* Last filter returned data via PSFS_PASS_ON
472 Do something with it */
473
474 for(bucket = inp->head; bucket; bucket = bucket->next) {
475 flushed_size += bucket->buflen;
476 }
477
478 if (flushed_size == 0) {
479 /* Unlikely, but possible */
480 return SUCCESS;
481 }
482
483 if (chain == &(stream->readfilters)) {
484 /* Dump any newly flushed data to the read buffer */
485 if (stream->readpos > 0) {
486 /* Back the buffer up */
487 memcpy(stream->readbuf, stream->readbuf + stream->readpos, stream->writepos - stream->readpos);
488 stream->readpos = 0;
489 stream->writepos -= stream->readpos;
490 }
491 if (flushed_size > (stream->readbuflen - stream->writepos)) {
492 /* Grow the buffer */
493 stream->readbuf = perealloc(stream->readbuf, stream->writepos + flushed_size + stream->chunk_size, stream->is_persistent);
494 }
495 while ((bucket = inp->head)) {
496 memcpy(stream->readbuf + stream->writepos, bucket->buf, bucket->buflen);
497 stream->writepos += bucket->buflen;
498 php_stream_bucket_unlink(bucket TSRMLS_CC);
499 php_stream_bucket_delref(bucket TSRMLS_CC);
500 }
501 } else if (chain == &(stream->writefilters)) {
502 /* Send flushed data to the stream */
503 while ((bucket = inp->head)) {
504 stream->ops->write(stream, bucket->buf, bucket->buflen TSRMLS_CC);
505 php_stream_bucket_unlink(bucket TSRMLS_CC);
506 php_stream_bucket_delref(bucket TSRMLS_CC);
507 }
508 }
509
510 return SUCCESS;
511 }
512
php_stream_filter_remove(php_stream_filter * filter,int call_dtor TSRMLS_DC)513 PHPAPI php_stream_filter *php_stream_filter_remove(php_stream_filter *filter, int call_dtor TSRMLS_DC)
514 {
515 if (filter->prev) {
516 filter->prev->next = filter->next;
517 } else {
518 filter->chain->head = filter->next;
519 }
520 if (filter->next) {
521 filter->next->prev = filter->prev;
522 } else {
523 filter->chain->tail = filter->prev;
524 }
525
526 if (filter->rsrc_id > 0) {
527 zend_list_delete(filter->rsrc_id);
528 }
529
530 if (call_dtor) {
531 php_stream_filter_free(filter TSRMLS_CC);
532 return NULL;
533 }
534 return filter;
535 }
536
537 /*
538 * Local variables:
539 * tab-width: 4
540 * c-basic-offset: 4
541 * End:
542 * vim600: noet sw=4 ts=4 fdm=marker
543 * vim<600: noet sw=4 ts=4
544 */
545
