2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Jelmer Vernooij 2002-2003,2005-2007
5 Copyright (C) Stefan (metze) Metzmacher 2003
6 Copyright (C) Andrew Bartlett 2011
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "dynconfig/dynconfig.h"
24 #include "lib/util/samba_modules.h"
25 #include "system/filesys.h"
26 #include "system/dir.h"
29 * Obtain the init function from a shared library file
31 init_module_fn load_module(const char *path, bool is_probe, void **handle_out)
37 /* This should be a WAF build, where modules should be built
38 * with no undefined symbols and are already linked against
39 * the libraries that they are loaded by */
40 handle = dlopen(path, RTLD_NOW);
42 /* This call should reset any possible non-fatal errors that
43 occurred since last call to dl* functions */
47 int level = is_probe ? 5 : 0;
48 DEBUG(level, ("Error loading module '%s': %s\n", path, error ? error : ""));
52 init_fn = (init_module_fn)dlsym(handle, SAMBA_INIT_MODULE);
54 /* we could check dlerror() to determine if it worked, because
55 dlsym() can validly return NULL, but what would we do with
56 a NULL pointer as a module init function? */
58 if (init_fn == NULL) {
59 DEBUG(0, ("Unable to find %s() in %s: %s\n",
60 SAMBA_INIT_MODULE, path, dlerror()));
61 DEBUG(1, ("Loading module '%s' failed\n", path));
70 return (init_module_fn)init_fn;
74 * Obtain list of init functions from the modules in the specified
77 static init_module_fn *load_modules(TALLOC_CTX *mem_ctx, const char *path)
83 init_module_fn *ret = talloc_array(mem_ctx, init_module_fn, 2);
93 while((entry = readdir(dir))) {
94 if (ISDOT(entry->d_name) || ISDOTDOT(entry->d_name))
97 filename = talloc_asprintf(mem_ctx, "%s/%s", path, entry->d_name);
99 ret[success] = load_module(filename, true, NULL);
101 ret = talloc_realloc(mem_ctx, ret, init_module_fn, success+2);
106 talloc_free(filename);
115 * Run the specified init functions.
117 * @return true if all functions ran successfully, false otherwise
119 bool run_init_functions(TALLOC_CTX *ctx, init_module_fn *fns)
127 for (i = 0; fns[i]; i++) { ret &= (bool)NT_STATUS_IS_OK(fns[i](ctx)); }
133 * Load the initialization functions from DSO files for a specific subsystem.
135 * Will return an array of function pointers to initialization functions
138 init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
140 char *path = modules_path(mem_ctx, subsystem);
143 ret = load_modules(mem_ctx, path);
150 static NTSTATUS load_module_absolute_path(const char *module_path,
157 DBG_INFO("%s module '%s'\n",
158 is_probe ? "Probing" : "Loading",
161 init = load_module(module_path, is_probe, &handle);
163 return NT_STATUS_UNSUCCESSFUL;
166 DBG_NOTICE("Module '%s' loaded\n", module_path);
169 if (!NT_STATUS_IS_OK(status)) {
170 DBG_ERR("Module '%s' initialization failed: %s\n",
172 get_friendly_nt_error_msg(status));
181 /* Load a dynamic module. Only log a level 0 error if we are not checking
182 for the existence of a module (probling). */
184 static NTSTATUS do_smb_load_module(const char *subsystem,
185 const char *module_name, bool is_probe)
191 char *full_path = NULL;
192 TALLOC_CTX *ctx = talloc_stackframe();
194 if (module_name == NULL) {
196 return NT_STATUS_INVALID_PARAMETER;
199 /* Check for absolute path */
201 DEBUG(5, ("%s module '%s'\n", is_probe ? "Probing" : "Loading", module_name));
203 if (subsystem && module_name[0] != '/') {
204 full_path = talloc_asprintf(ctx,
206 modules_path(ctx, subsystem),
211 return NT_STATUS_NO_MEMORY;
214 DEBUG(5, ("%s module '%s': Trying to load from %s\n",
215 is_probe ? "Probing": "Loading", module_name, full_path));
216 init = load_module(full_path, is_probe, &handle);
218 init = load_module(module_name, is_probe, &handle);
223 return NT_STATUS_UNSUCCESSFUL;
226 DEBUG(2, ("Module '%s' loaded\n", module_name));
229 if (!NT_STATUS_IS_OK(status)) {
230 DEBUG(0, ("Module '%s' initialization failed: %s\n",
231 module_name, get_friendly_nt_error_msg(status)));
238 /* Load all modules in list and return number of
239 * modules that has been successfully loaded */
240 int smb_load_all_modules_absoute_path(const char **modules)
245 for(i = 0; modules[i] != NULL; i++) {
246 const char *module = modules[i];
249 if (module[0] != '/') {
253 status = load_module_absolute_path(module, false);
254 if (NT_STATUS_IS_OK(status)) {
259 DEBUG(2, ("%d modules successfully loaded\n", success));
265 * @brief Check if a module exist and load it.
267 * @param[in] subsystem The name of the subsystem the module belongs too.
269 * @param[in] module The name of the module
271 * @return A NTSTATUS code
273 NTSTATUS smb_probe_module(const char *subsystem, const char *module)
276 char *module_path = NULL;
277 TALLOC_CTX *tmp_ctx = talloc_stackframe();
279 if (subsystem == NULL) {
280 status = NT_STATUS_INVALID_PARAMETER;
283 if (module == NULL) {
284 status = NT_STATUS_INVALID_PARAMETER;
288 if (strchr(module, '/')) {
289 status = NT_STATUS_INVALID_PARAMETER;
293 module_path = talloc_asprintf(tmp_ctx,
295 modules_path(tmp_ctx, subsystem),
298 if (module_path == NULL) {
299 status = NT_STATUS_NO_MEMORY;
303 status = load_module_absolute_path(module_path, true);
306 TALLOC_FREE(tmp_ctx);
311 * @brief Check if a module exist and load it.
313 * Warning: Using this function can have security implecations!
315 * @param[in] subsystem The name of the subsystem the module belongs too.
317 * @param[in] module Load a module using an abolute path.
319 * @return A NTSTATUS code
321 NTSTATUS smb_probe_module_absolute_path(const char *module)
323 if (module == NULL) {
324 return NT_STATUS_INVALID_PARAMETER;
326 if (module[0] != '/') {
327 return NT_STATUS_INVALID_PARAMETER;
330 return load_module_absolute_path(module, true);
333 NTSTATUS smb_load_module(const char *subsystem, const char *module)
335 return do_smb_load_module(subsystem, module, false);