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: Brian Schaffner <brian@tool.net> |
16 | Shane Caraveo <shane@caraveo.com> |
17 | Zeev Suraski <zeev@zend.com> |
18 +----------------------------------------------------------------------+
19 */
20
21 /* $Id$ */
22
23 #include "php.h"
24 #include "dl.h"
25 #include "php_globals.h"
26 #include "php_ini.h"
27 #include "ext/standard/info.h"
28
29 #include "SAPI.h"
30
31 #if defined(HAVE_LIBDL)
32 #include <stdlib.h>
33 #include <stdio.h>
34 #ifdef HAVE_STRING_H
35 #include <string.h>
36 #else
37 #include <strings.h>
38 #endif
39 #ifdef PHP_WIN32
40 #include "win32/param.h"
41 #include "win32/winutil.h"
42 #define GET_DL_ERROR() php_win_err()
43 #elif defined(NETWARE)
44 #include <sys/param.h>
45 #define GET_DL_ERROR() dlerror()
46 #else
47 #include <sys/param.h>
48 #define GET_DL_ERROR() DL_ERROR()
49 #endif
50 #endif /* defined(HAVE_LIBDL) */
51
52 /* {{{ proto int dl(string extension_filename)
53 Load a PHP extension at runtime */
PHP_FUNCTION(dl)54 PHPAPI PHP_FUNCTION(dl)
55 {
56 char *filename;
57 int filename_len;
58
59 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &filename, &filename_len) == FAILURE) {
60 return;
61 }
62
63 if (!PG(enable_dl)) {
64 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Dynamically loaded extensions aren't enabled");
65 RETURN_FALSE;
66 }
67
68 if (filename_len >= MAXPATHLEN) {
69 php_error_docref(NULL TSRMLS_CC, E_WARNING, "File name exceeds the maximum allowed length of %d characters", MAXPATHLEN);
70 RETURN_FALSE;
71 }
72
73 if ((strncmp(sapi_module.name, "cgi", 3) != 0) &&
74 (strcmp(sapi_module.name, "cli") != 0) &&
75 (strncmp(sapi_module.name, "embed", 5) != 0)
76 ) {
77 #ifdef ZTS
78 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Not supported in multithreaded Web servers - use extension=%s in your php.ini", filename);
79 RETURN_FALSE;
80 #else
81 php_error_docref(NULL TSRMLS_CC, E_DEPRECATED, "dl() is deprecated - use extension=%s in your php.ini", filename);
82 #endif
83 }
84
85 php_dl(filename, MODULE_TEMPORARY, return_value, 0 TSRMLS_CC);
86 if (Z_LVAL_P(return_value) == 1) {
87 EG(full_tables_cleanup) = 1;
88 }
89 }
90 /* }}} */
91
92 #if defined(HAVE_LIBDL)
93
94 #ifdef ZTS
95 #define USING_ZTS 1
96 #else
97 #define USING_ZTS 0
98 #endif
99
100 /* {{{ php_load_extension
101 */
php_load_extension(char * filename,int type,int start_now TSRMLS_DC)102 PHPAPI int php_load_extension(char *filename, int type, int start_now TSRMLS_DC)
103 {
104 void *handle;
105 char *libpath;
106 zend_module_entry *module_entry;
107 zend_module_entry *(*get_module)(void);
108 int error_type;
109 char *extension_dir;
110
111 if (type == MODULE_PERSISTENT) {
112 extension_dir = INI_STR("extension_dir");
113 } else {
114 extension_dir = PG(extension_dir);
115 }
116
117 if (type == MODULE_TEMPORARY) {
118 error_type = E_WARNING;
119 } else {
120 error_type = E_CORE_WARNING;
121 }
122
123 /* Check if passed filename contains directory separators */
124 if (strchr(filename, '/') != NULL || strchr(filename, DEFAULT_SLASH) != NULL) {
125 /* Passing modules with full path is not supported for dynamically loaded extensions */
126 if (type == MODULE_TEMPORARY) {
127 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Temporary module name should contain only filename");
128 return FAILURE;
129 }
130 libpath = estrdup(filename);
131 } else if (extension_dir && extension_dir[0]) {
132 int extension_dir_len = strlen(extension_dir);
133
134 if (IS_SLASH(extension_dir[extension_dir_len-1])) {
135 spprintf(&libpath, 0, "%s%s", extension_dir, filename); /* SAFE */
136 } else {
137 spprintf(&libpath, 0, "%s%c%s", extension_dir, DEFAULT_SLASH, filename); /* SAFE */
138 }
139 } else {
140 return FAILURE; /* Not full path given or extension_dir is not set */
141 }
142
143 /* load dynamic symbol */
144 handle = DL_LOAD(libpath);
145 if (!handle) {
146 #if PHP_WIN32
147 char *err = GET_DL_ERROR();
148 if (err && (*err != "")) {
149 php_error_docref(NULL TSRMLS_CC, error_type, "Unable to load dynamic library '%s' - %s", libpath, err);
150 LocalFree(err);
151 } else {
152 php_error_docref(NULL TSRMLS_CC, error_type, "Unable to load dynamic library '%s' - %s", libpath, "Unknown reason");
153 }
154 #else
155 php_error_docref(NULL TSRMLS_CC, error_type, "Unable to load dynamic library '%s' - %s", libpath, GET_DL_ERROR());
156 GET_DL_ERROR(); /* free the buffer storing the error */
157 #endif
158 efree(libpath);
159 return FAILURE;
160 }
161 efree(libpath);
162
163 get_module = (zend_module_entry *(*)(void)) DL_FETCH_SYMBOL(handle, "get_module");
164
165 /* Some OS prepend _ to symbol names while their dynamic linker
166 * does not do that automatically. Thus we check manually for
167 * _get_module. */
168
169 if (!get_module) {
170 get_module = (zend_module_entry *(*)(void)) DL_FETCH_SYMBOL(handle, "_get_module");
171 }
172
173 if (!get_module) {
174 if (DL_FETCH_SYMBOL(handle, "zend_extension_entry") || DL_FETCH_SYMBOL(handle, "_zend_extension_entry")) {
175 DL_UNLOAD(handle);
176 php_error_docref(NULL TSRMLS_CC, error_type, "Invalid library (appears to be a Zend Extension, try loading using zend_extension=%s from php.ini)", filename);
177 return FAILURE;
178 }
179 DL_UNLOAD(handle);
180 php_error_docref(NULL TSRMLS_CC, error_type, "Invalid library (maybe not a PHP library) '%s'", filename);
181 return FAILURE;
182 }
183 module_entry = get_module();
184 if (module_entry->zend_api != ZEND_MODULE_API_NO) {
185 /* Check for pre-4.1.0 module which has a slightly different module_entry structure :( */
186 struct pre_4_1_0_module_entry {
187 char *name;
188 zend_function_entry *functions;
189 int (*module_startup_func)(INIT_FUNC_ARGS);
190 int (*module_shutdown_func)(SHUTDOWN_FUNC_ARGS);
191 int (*request_startup_func)(INIT_FUNC_ARGS);
192 int (*request_shutdown_func)(SHUTDOWN_FUNC_ARGS);
193 void (*info_func)(ZEND_MODULE_INFO_FUNC_ARGS);
194 int (*global_startup_func)(void);
195 int (*global_shutdown_func)(void);
196 int globals_id;
197 int module_started;
198 unsigned char type;
199 void *handle;
200 int module_number;
201 unsigned char zend_debug;
202 unsigned char zts;
203 unsigned int zend_api;
204 };
205
206 const char *name;
207 int zend_api;
208
209 if ((((struct pre_4_1_0_module_entry *)module_entry)->zend_api > 20000000) &&
210 (((struct pre_4_1_0_module_entry *)module_entry)->zend_api < 20010901)
211 ) {
212 name = ((struct pre_4_1_0_module_entry *)module_entry)->name;
213 zend_api = ((struct pre_4_1_0_module_entry *)module_entry)->zend_api;
214 } else {
215 name = module_entry->name;
216 zend_api = module_entry->zend_api;
217 }
218
219 php_error_docref(NULL TSRMLS_CC, error_type,
220 "%s: Unable to initialize module\n"
221 "Module compiled with module API=%d\n"
222 "PHP compiled with module API=%d\n"
223 "These options need to match\n",
224 name, zend_api, ZEND_MODULE_API_NO);
225 DL_UNLOAD(handle);
226 return FAILURE;
227 }
228 if(strcmp(module_entry->build_id, ZEND_MODULE_BUILD_ID)) {
229 php_error_docref(NULL TSRMLS_CC, error_type,
230 "%s: Unable to initialize module\n"
231 "Module compiled with build ID=%s\n"
232 "PHP compiled with build ID=%s\n"
233 "These options need to match\n",
234 module_entry->name, module_entry->build_id, ZEND_MODULE_BUILD_ID);
235 DL_UNLOAD(handle);
236 return FAILURE;
237 }
238 module_entry->type = type;
239 module_entry->module_number = zend_next_free_module();
240 module_entry->handle = handle;
241
242 if ((module_entry = zend_register_module_ex(module_entry TSRMLS_CC)) == NULL) {
243 DL_UNLOAD(handle);
244 return FAILURE;
245 }
246
247 if ((type == MODULE_TEMPORARY || start_now) && zend_startup_module_ex(module_entry TSRMLS_CC) == FAILURE) {
248 DL_UNLOAD(handle);
249 return FAILURE;
250 }
251
252 if ((type == MODULE_TEMPORARY || start_now) && module_entry->request_startup_func) {
253 if (module_entry->request_startup_func(type, module_entry->module_number TSRMLS_CC) == FAILURE) {
254 php_error_docref(NULL TSRMLS_CC, error_type, "Unable to initialize module '%s'", module_entry->name);
255 DL_UNLOAD(handle);
256 return FAILURE;
257 }
258 }
259 return SUCCESS;
260 }
261 /* }}} */
262
263 /* {{{ php_dl
264 */
php_dl(char * file,int type,zval * return_value,int start_now TSRMLS_DC)265 PHPAPI void php_dl(char *file, int type, zval *return_value, int start_now TSRMLS_DC)
266 {
267 /* Load extension */
268 if (php_load_extension(file, type, start_now TSRMLS_CC) == FAILURE) {
269 RETVAL_FALSE;
270 } else {
271 RETVAL_TRUE;
272 }
273 }
274 /* }}} */
275
PHP_MINFO_FUNCTION(dl)276 PHP_MINFO_FUNCTION(dl)
277 {
278 php_info_print_table_row(2, "Dynamic Library Support", "enabled");
279 }
280
281 #else
282
php_dl(char * file,int type,zval * return_value,int start_now TSRMLS_DC)283 PHPAPI void php_dl(char *file, int type, zval *return_value, int start_now TSRMLS_DC)
284 {
285 php_error_docref(NULL TSRMLS_CC, E_WARNING, "Cannot dynamically load %s - dynamic modules are not supported", file);
286 RETURN_FALSE;
287 }
288
PHP_MINFO_FUNCTION(dl)289 PHP_MINFO_FUNCTION(dl)
290 {
291 PUTS("Dynamic Library support not available<br />.\n");
292 }
293
294 #endif
295
296 /*
297 * Local variables:
298 * tab-width: 4
299 * c-basic-offset: 4
300 * End:
301 * vim600: sw=4 ts=4 fdm=marker
302 * vim<600: sw=4 ts=4
303 */
304
