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 | Author: Christian Cartus <cartus@atrior.de> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 /* This has been built and tested on Linux 2.2.14
22 *
23 * This has been built and tested on Solaris 2.6.
24 * It may not compile or execute correctly on other systems.
25 */
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "php.h"
32
33 #if HAVE_SYSVSHM
34
35 #include <errno.h>
36
37 #include "php_sysvshm.h"
38 #include "ext/standard/php_var.h"
39 #include "ext/standard/php_smart_str.h"
40 #include "php_ini.h"
41
42 /* {{{ arginfo */
43 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_attach, 0, 0, 1)
44 ZEND_ARG_INFO(0, key)
45 ZEND_ARG_INFO(0, memsize)
46 ZEND_ARG_INFO(0, perm)
47 ZEND_END_ARG_INFO()
48
49 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_detach, 0, 0, 1)
50 ZEND_ARG_INFO(0, shm_identifier)
51 ZEND_END_ARG_INFO()
52
53 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_has_var, 0, 0, 2)
54 ZEND_ARG_INFO(0, id)
55 ZEND_ARG_INFO(0, variable_key)
56 ZEND_END_ARG_INFO()
57
58 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_remove, 0, 0, 1)
59 ZEND_ARG_INFO(0, shm_identifier)
60 ZEND_END_ARG_INFO()
61
62 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_put_var, 0, 0, 3)
63 ZEND_ARG_INFO(0, shm_identifier)
64 ZEND_ARG_INFO(0, variable_key)
65 ZEND_ARG_INFO(0, variable)
66 ZEND_END_ARG_INFO()
67
68 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_get_var, 0, 0, 2)
69 ZEND_ARG_INFO(0, id)
70 ZEND_ARG_INFO(0, variable_key)
71 ZEND_END_ARG_INFO()
72
73 ZEND_BEGIN_ARG_INFO_EX(arginfo_shm_remove_var, 0, 0, 2)
74 ZEND_ARG_INFO(0, id)
75 ZEND_ARG_INFO(0, variable_key)
76 ZEND_END_ARG_INFO()
77 /* }}} */
78
79 /* {{{ sysvshm_functions[]
80 */
81 const zend_function_entry sysvshm_functions[] = {
82 PHP_FE(shm_attach, arginfo_shm_attach)
83 PHP_FE(shm_remove, arginfo_shm_detach)
84 PHP_FE(shm_detach, arginfo_shm_remove)
85 PHP_FE(shm_put_var, arginfo_shm_put_var)
86 PHP_FE(shm_has_var, arginfo_shm_has_var)
87 PHP_FE(shm_get_var, arginfo_shm_get_var)
88 PHP_FE(shm_remove_var, arginfo_shm_remove_var)
89 PHP_FE_END
90 };
91 /* }}} */
92
93 /* {{{ sysvshm_module_entry
94 */
95 zend_module_entry sysvshm_module_entry = {
96 STANDARD_MODULE_HEADER,
97 "sysvshm",
98 sysvshm_functions,
99 PHP_MINIT(sysvshm),
100 NULL,
101 NULL,
102 NULL,
103 NULL,
104 NO_VERSION_YET,
105 STANDARD_MODULE_PROPERTIES
106 };
107 /* }}} */
108
109 #ifdef COMPILE_DL_SYSVSHM
110 ZEND_GET_MODULE(sysvshm)
111 #endif
112
113 #undef shm_ptr /* undefine AIX-specific macro */
114
115 #define SHM_FETCH_RESOURCE(shm_ptr, z_ptr) ZEND_FETCH_RESOURCE(shm_ptr, sysvshm_shm *, &z_ptr, -1, PHP_SHM_RSRC_NAME, php_sysvshm.le_shm)
116
117 THREAD_LS sysvshm_module php_sysvshm;
118
119 static int php_put_shm_data(sysvshm_chunk_head *ptr, long key, const char *data, long len);
120 static long php_check_shm_data(sysvshm_chunk_head *ptr, long key);
121 static int php_remove_shm_data(sysvshm_chunk_head *ptr, long shm_varpos);
122
123 /* {{{ php_release_sysvshm
124 */
php_release_sysvshm(zend_rsrc_list_entry * rsrc TSRMLS_DC)125 static void php_release_sysvshm(zend_rsrc_list_entry *rsrc TSRMLS_DC)
126 {
127 sysvshm_shm *shm_ptr = (sysvshm_shm *) rsrc->ptr;
128 shmdt((void *) shm_ptr->ptr);
129 efree(shm_ptr);
130 }
131 /* }}} */
132
133 /* {{{ PHP_MINIT_FUNCTION
134 */
PHP_MINIT_FUNCTION(sysvshm)135 PHP_MINIT_FUNCTION(sysvshm)
136 {
137 php_sysvshm.le_shm = zend_register_list_destructors_ex(php_release_sysvshm, NULL, PHP_SHM_RSRC_NAME, module_number);
138
139 if (cfg_get_long("sysvshm.init_mem", &php_sysvshm.init_mem) == FAILURE) {
140 php_sysvshm.init_mem=10000;
141 }
142 return SUCCESS;
143 }
144 /* }}} */
145
146 /* {{{ proto int shm_attach(int key [, int memsize [, int perm]])
147 Creates or open a shared memory segment */
PHP_FUNCTION(shm_attach)148 PHP_FUNCTION(shm_attach)
149 {
150 sysvshm_shm *shm_list_ptr;
151 char *shm_ptr;
152 sysvshm_chunk_head *chunk_ptr;
153 long shm_key, shm_id, shm_size = php_sysvshm.init_mem, shm_flag = 0666;
154
155 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l|ll", &shm_key, &shm_size, &shm_flag)) {
156 return;
157 }
158
159 if (shm_size < 1) {
160 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Segment size must be greater than zero");
161 RETURN_FALSE;
162 }
163
164 shm_list_ptr = (sysvshm_shm *) emalloc(sizeof(sysvshm_shm));
165
166 /* get the id from a specified key or create new shared memory */
167 if ((shm_id = shmget(shm_key, 0, 0)) < 0) {
168 if (shm_size < sizeof(sysvshm_chunk_head)) {
169 php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed for key 0x%lx: memorysize too small", shm_key);
170 efree(shm_list_ptr);
171 RETURN_FALSE;
172 }
173 if ((shm_id = shmget(shm_key, shm_size, shm_flag | IPC_CREAT | IPC_EXCL)) < 0) {
174 php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed for key 0x%lx: %s", shm_key, strerror(errno));
175 efree(shm_list_ptr);
176 RETURN_FALSE;
177 }
178 }
179
180 if ((shm_ptr = shmat(shm_id, NULL, 0)) == (void *) -1) {
181 php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed for key 0x%lx: %s", shm_key, strerror(errno));
182 efree(shm_list_ptr);
183 RETURN_FALSE;
184 }
185
186 /* check if shm is already initialized */
187 chunk_ptr = (sysvshm_chunk_head *) shm_ptr;
188 if (strcmp((char*) &(chunk_ptr->magic), "PHP_SM") != 0) {
189 strcpy((char*) &(chunk_ptr->magic), "PHP_SM");
190 chunk_ptr->start = sizeof(sysvshm_chunk_head);
191 chunk_ptr->end = chunk_ptr->start;
192 chunk_ptr->total = shm_size;
193 chunk_ptr->free = shm_size-chunk_ptr->end;
194 }
195
196 shm_list_ptr->key = shm_key;
197 shm_list_ptr->id = shm_id;
198 shm_list_ptr->ptr = chunk_ptr;
199
200 ZEND_REGISTER_RESOURCE(return_value, shm_list_ptr, php_sysvshm.le_shm);
201 }
202 /* }}} */
203
204 /* {{{ proto bool shm_detach(resource shm_identifier)
205 Disconnects from shared memory segment */
PHP_FUNCTION(shm_detach)206 PHP_FUNCTION(shm_detach)
207 {
208 zval *shm_id;
209 sysvshm_shm *shm_list_ptr;
210
211 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &shm_id)) {
212 return;
213 }
214 SHM_FETCH_RESOURCE(shm_list_ptr, shm_id);
215 RETURN_BOOL(SUCCESS == zend_list_delete(Z_LVAL_P(shm_id)));
216 }
217 /* }}} */
218
219 /* {{{ proto bool shm_remove(resource shm_identifier)
220 Removes shared memory from Unix systems */
PHP_FUNCTION(shm_remove)221 PHP_FUNCTION(shm_remove)
222 {
223 zval *shm_id;
224 sysvshm_shm *shm_list_ptr;
225
226 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &shm_id)) {
227 return;
228 }
229 SHM_FETCH_RESOURCE(shm_list_ptr, shm_id);
230
231 if (shmctl(shm_list_ptr->id, IPC_RMID, NULL) < 0) {
232 php_error_docref(NULL TSRMLS_CC, E_WARNING, "failed for key 0x%x, id %ld: %s", shm_list_ptr->key, Z_LVAL_P(shm_id), strerror(errno));
233 RETURN_FALSE;
234 }
235
236 RETURN_TRUE;
237 }
238 /* }}} */
239
240 /* {{{ proto bool shm_put_var(resource shm_identifier, int variable_key, mixed variable)
241 Inserts or updates a variable in shared memory */
PHP_FUNCTION(shm_put_var)242 PHP_FUNCTION(shm_put_var)
243 {
244 zval *shm_id, *arg_var;
245 int ret;
246 long shm_key;
247 sysvshm_shm *shm_list_ptr;
248 smart_str shm_var = {0};
249 php_serialize_data_t var_hash;
250
251 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rlz", &shm_id, &shm_key, &arg_var)) {
252 return;
253 }
254
255 /* setup string-variable and serialize */
256 PHP_VAR_SERIALIZE_INIT(var_hash);
257 php_var_serialize(&shm_var, &arg_var, &var_hash TSRMLS_CC);
258 PHP_VAR_SERIALIZE_DESTROY(var_hash);
259
260 shm_list_ptr = zend_fetch_resource(&shm_id TSRMLS_CC, -1, PHP_SHM_RSRC_NAME, NULL, 1, php_sysvshm.le_shm);
261 if (!shm_list_ptr) {
262 smart_str_free(&shm_var);
263 RETURN_FALSE;
264 }
265
266 /* insert serialized variable into shared memory */
267 ret = php_put_shm_data(shm_list_ptr->ptr, shm_key, shm_var.c, shm_var.len);
268
269 /* free string */
270 smart_str_free(&shm_var);
271
272 if (ret == -1) {
273 php_error_docref(NULL TSRMLS_CC, E_WARNING, "not enough shared memory left");
274 RETURN_FALSE;
275 }
276 RETURN_TRUE;
277 }
278 /* }}} */
279
280 /* {{{ proto mixed shm_get_var(resource id, int variable_key)
281 Returns a variable from shared memory */
PHP_FUNCTION(shm_get_var)282 PHP_FUNCTION(shm_get_var)
283 {
284 zval *shm_id;
285 long shm_key;
286 sysvshm_shm *shm_list_ptr;
287 char *shm_data;
288 long shm_varpos;
289 sysvshm_chunk *shm_var;
290 php_unserialize_data_t var_hash;
291
292 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rl", &shm_id, &shm_key)) {
293 return;
294 }
295 SHM_FETCH_RESOURCE(shm_list_ptr, shm_id);
296
297 /* setup string-variable and serialize */
298 /* get serialized variable from shared memory */
299 shm_varpos = php_check_shm_data((shm_list_ptr->ptr), shm_key);
300
301 if (shm_varpos < 0) {
302 php_error_docref(NULL TSRMLS_CC, E_WARNING, "variable key %ld doesn't exist", shm_key);
303 RETURN_FALSE;
304 }
305 shm_var = (sysvshm_chunk*) ((char *)shm_list_ptr->ptr + shm_varpos);
306 shm_data = &shm_var->mem;
307
308 PHP_VAR_UNSERIALIZE_INIT(var_hash);
309 if (php_var_unserialize(&return_value, (const unsigned char **) &shm_data, (unsigned char *) shm_data + shm_var->length, &var_hash TSRMLS_CC) != 1) {
310 php_error_docref(NULL TSRMLS_CC, E_WARNING, "variable data in shared memory is corrupted");
311 RETVAL_FALSE;
312 }
313 PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
314 }
315 /* }}} */
316
317 /* {{{ proto bool shm_has_var(resource id, int variable_key)
318 Checks whether a specific entry exists */
PHP_FUNCTION(shm_has_var)319 PHP_FUNCTION(shm_has_var)
320 {
321 zval *shm_id;
322 long shm_key;
323 sysvshm_shm *shm_list_ptr;
324
325 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rl", &shm_id, &shm_key)) {
326 return;
327 }
328 SHM_FETCH_RESOURCE(shm_list_ptr, shm_id);
329 RETURN_BOOL(php_check_shm_data(shm_list_ptr->ptr, shm_key) >= 0);
330 }
331 /* }}} */
332
333 /* {{{ proto bool shm_remove_var(resource id, int variable_key)
334 Removes variable from shared memory */
PHP_FUNCTION(shm_remove_var)335 PHP_FUNCTION(shm_remove_var)
336 {
337 zval *shm_id;
338 long shm_key, shm_varpos;
339 sysvshm_shm *shm_list_ptr;
340
341 if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rl", &shm_id, &shm_key)) {
342 return;
343 }
344 SHM_FETCH_RESOURCE(shm_list_ptr, shm_id);
345
346 shm_varpos = php_check_shm_data((shm_list_ptr->ptr), shm_key);
347
348 if (shm_varpos < 0) {
349 php_error_docref(NULL TSRMLS_CC, E_WARNING, "variable key %ld doesn't exist", shm_key);
350 RETURN_FALSE;
351 }
352 php_remove_shm_data((shm_list_ptr->ptr), shm_varpos);
353 RETURN_TRUE;
354 }
355 /* }}} */
356
357 /* {{{ php_put_shm_data
358 * inserts an ascii-string into shared memory */
php_put_shm_data(sysvshm_chunk_head * ptr,long key,const char * data,long len)359 static int php_put_shm_data(sysvshm_chunk_head *ptr, long key, const char *data, long len)
360 {
361 sysvshm_chunk *shm_var;
362 long total_size;
363 long shm_varpos;
364
365 total_size = ((long) (len + sizeof(sysvshm_chunk) - 1) / sizeof(long)) * sizeof(long) + sizeof(long); /* long alligment */
366
367 if ((shm_varpos = php_check_shm_data(ptr, key)) > 0) {
368 php_remove_shm_data(ptr, shm_varpos);
369 }
370
371 if (ptr->free < total_size) {
372 return -1; /* not enough memory */
373 }
374
375 shm_var = (sysvshm_chunk *) ((char *) ptr + ptr->end);
376 shm_var->key = key;
377 shm_var->length = len;
378 shm_var->next = total_size;
379 memcpy(&(shm_var->mem), data, len);
380 ptr->end += total_size;
381 ptr->free -= total_size;
382 return 0;
383 }
384 /* }}} */
385
386 /* {{{ php_check_shm_data
387 */
php_check_shm_data(sysvshm_chunk_head * ptr,long key)388 static long php_check_shm_data(sysvshm_chunk_head *ptr, long key)
389 {
390 long pos;
391 sysvshm_chunk *shm_var;
392
393 pos = ptr->start;
394
395 for (;;) {
396 if (pos >= ptr->end) {
397 return -1;
398 }
399 shm_var = (sysvshm_chunk*) ((char *) ptr + pos);
400 if (shm_var->key == key) {
401 return pos;
402 }
403 pos += shm_var->next;
404
405 if (shm_var->next <= 0 || pos < ptr->start) {
406 return -1;
407 }
408 }
409 return -1;
410 }
411 /* }}} */
412
413 /* {{{ php_remove_shm_data
414 */
php_remove_shm_data(sysvshm_chunk_head * ptr,long shm_varpos)415 static int php_remove_shm_data(sysvshm_chunk_head *ptr, long shm_varpos)
416 {
417 sysvshm_chunk *chunk_ptr, *next_chunk_ptr;
418 long memcpy_len;
419
420 chunk_ptr = (sysvshm_chunk *) ((char *) ptr + shm_varpos);
421 next_chunk_ptr = (sysvshm_chunk *) ((char *) ptr + shm_varpos + chunk_ptr->next);
422
423 memcpy_len = ptr->end-shm_varpos - chunk_ptr->next;
424 ptr->free += chunk_ptr->next;
425 ptr->end -= chunk_ptr->next;
426 if (memcpy_len > 0) {
427 memmove(chunk_ptr, next_chunk_ptr, memcpy_len);
428 }
429 return 0;
430 }
431 /* }}} */
432
433 #endif /* HAVE_SYSVSHM */
434
435 /*
436 * Local variables:
437 * tab-width: 4
438 * c-basic-offset: 4
439 * End:
440 * vim600: sw=4 ts=4 fdm=marker
441 * vim<600: sw=4 ts=4
442 */
443
