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(TALLOC_CTX *mem_ctx, const char *path)
36 handle = dlopen(path, RTLD_NOW);
38 DEBUG(0, ("Unable to open %s: %s\n", path, dlerror()));
42 init_fn = dlsym(handle, SAMBA_INIT_MODULE);
44 if (init_fn == NULL) {
45 DEBUG(0, ("Unable to find %s() in %s: %s\n",
46 SAMBA_INIT_MODULE, path, dlerror()));
47 DEBUG(1, ("Loading module '%s' failed\n", path));
52 return (init_module_fn)init_fn;
56 * Obtain list of init functions from the modules in the specified
59 static init_module_fn *load_modules(TALLOC_CTX *mem_ctx, const char *path)
65 init_module_fn *ret = talloc_array(mem_ctx, init_module_fn, 2);
75 while((entry = readdir(dir))) {
76 if (ISDOT(entry->d_name) || ISDOTDOT(entry->d_name))
79 filename = talloc_asprintf(mem_ctx, "%s/%s", path, entry->d_name);
81 ret[success] = load_module(mem_ctx, filename);
83 ret = talloc_realloc(mem_ctx, ret, init_module_fn, success+2);
88 talloc_free(filename);
97 * Run the specified init functions.
99 * @return true if all functions ran successfully, false otherwise
101 bool run_init_functions(init_module_fn *fns)
109 for (i = 0; fns[i]; i++) { ret &= (bool)NT_STATUS_IS_OK(fns[i]()); }
115 * Load the initialization functions from DSO files for a specific subsystem.
117 * Will return an array of function pointers to initialization functions
120 init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
122 char *path = modules_path(mem_ctx, subsystem);
125 ret = load_modules(mem_ctx, path);
133 /* Load a dynamic module. Only log a level 0 error if we are not checking
134 for the existence of a module (probling). */
136 static NTSTATUS do_smb_load_module(const char *module_name, bool is_probe)
143 /* Always try to use LAZY symbol resolving; if the plugin has
144 * backwards compatibility, there might be symbols in the
145 * plugin referencing to old (removed) functions
147 handle = dlopen(module_name, RTLD_LAZY);
149 /* This call should reset any possible non-fatal errors that
150 occured since last call to dl* functions */
154 int level = is_probe ? 3 : 0;
155 DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : ""));
156 return NT_STATUS_UNSUCCESSFUL;
159 init = (init_module_fn)dlsym(handle, SAMBA_INIT_MODULE);
161 /* we must check dlerror() to determine if it worked, because
162 dlsym() can validly return NULL */
165 DEBUG(0, ("Error trying to resolve symbol '" SAMBA_INIT_MODULE
166 "' in %s: %s\n", module_name, error));
168 return NT_STATUS_UNSUCCESSFUL;
171 DEBUG(2, ("Module '%s' loaded\n", module_name));
174 if (!NT_STATUS_IS_OK(status)) {
175 DEBUG(0, ("Module '%s' initialization failed: %s\n",
176 module_name, get_friendly_nt_error_msg(status)));
183 /* Load all modules in list and return number of
184 * modules that has been successfully loaded */
185 int smb_load_modules(const char **modules)
190 for(i = 0; modules[i]; i++){
191 if(NT_STATUS_IS_OK(do_smb_load_module(modules[i], false))) {
196 DEBUG(2, ("%d modules successfully loaded\n", success));
201 NTSTATUS smb_probe_module(const char *subsystem, const char *module)
203 char *full_path = NULL;
204 TALLOC_CTX *ctx = talloc_stackframe();
207 /* Check for absolute path */
209 /* if we make any 'samba multibyte string'
211 for loading string modules */
213 DEBUG(5, ("Probing module '%s'\n", module));
215 if (module[0] == '/') {
216 status = do_smb_load_module(module, true);
221 full_path = talloc_asprintf(ctx,
223 modules_path(ctx, subsystem),
228 return NT_STATUS_NO_MEMORY;
231 DEBUG(5, ("Probing module '%s': Trying to load from %s\n",
234 status = do_smb_load_module(full_path, true);