+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
- Samba utility functions
- Copyright (C) Jelmer Vernooij 2002-2003,2005-2007
- Copyright (C) Stefan (metze) Metzmacher 2003
- Copyright (C) Andrew Bartlett 2011
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "includes.h"
-#include "dynconfig/dynconfig.h"
-#include "lib/util/samba_modules.h"
-#include "system/filesys.h"
-#include "system/dir.h"
-
-/**
- * Obtain the init function from a shared library file
- */
-samba_init_module_fn load_module(const char *path, bool is_probe, void **handle_out)
-{
- void *handle;
- void *init_fn;
- char *error;
-
-#if _SAMBA_BUILD_ == 3
- /* Always try to use LAZY symbol resolving; if the plugin has
- * backwards compatibility, there might be symbols in the
- * plugin referencing to old (removed) functions
- */
- handle = dlopen(path, RTLD_LAZY);
-#else
- /* This should be a WAF build, where modules should be built
- * with no undefined symbols and are already linked against
- * the libraries that they are loaded by */
- handle = dlopen(path, RTLD_NOW);
-#endif
-
- /* This call should reset any possible non-fatal errors that
- occured since last call to dl* functions */
- error = dlerror();
-
- if (handle == NULL) {
- int level = is_probe ? 5 : 0;
- DEBUG(level, ("Error loading module '%s': %s\n", path, error ? error : ""));
- return NULL;
- }
-
- init_fn = (samba_init_module_fn)dlsym(handle, SAMBA_INIT_MODULE);
-
- /* we could check dlerror() to determine if it worked, because
- dlsym() can validly return NULL, but what would we do with
- a NULL pointer as a module init function? */
-
- if (init_fn == NULL) {
- DEBUG(0, ("Unable to find %s() in %s: %s\n",
- SAMBA_INIT_MODULE, path, dlerror()));
- DEBUG(1, ("Loading module '%s' failed\n", path));
- dlclose(handle);
- return NULL;
- }
-
- if (handle_out) {
- *handle_out = handle;
- }
-
- return (samba_init_module_fn)init_fn;
-}
-
-/**
- * Obtain list of init functions from the modules in the specified
- * directory
- */
-static samba_init_module_fn *load_modules(TALLOC_CTX *mem_ctx, const char *path)
-{
- DIR *dir;
- struct dirent *entry;
- char *filename;
- int success = 0;
- samba_init_module_fn *ret = talloc_array(mem_ctx, samba_init_module_fn, 2);
-
- ret[0] = NULL;
-
- dir = opendir(path);
- if (dir == NULL) {
- talloc_free(ret);
- return NULL;
- }
-
- while((entry = readdir(dir))) {
- if (ISDOT(entry->d_name) || ISDOTDOT(entry->d_name))
- continue;
-
- filename = talloc_asprintf(mem_ctx, "%s/%s", path, entry->d_name);
-
- ret[success] = load_module(filename, true, NULL);
- if (ret[success]) {
- ret = talloc_realloc(mem_ctx, ret, samba_init_module_fn, success+2);
- success++;
- ret[success] = NULL;
- }
-
- talloc_free(filename);
- }
-
- closedir(dir);
-
- return ret;
-}
-
-/**
- * Run the specified init functions.
- *
- * @return true if all functions ran successfully, false otherwise
- */
-bool samba_init_module_fns_run(samba_init_module_fn *fns)
-{
- int i;
- bool ret = true;
-
- if (fns == NULL)
- return true;
-
- for (i = 0; fns[i]; i++) { ret &= (bool)NT_STATUS_IS_OK(fns[i]()); }
-
- return ret;
-}
-
-/**
- * Load the initialization functions from DSO files for a specific subsystem.
- *
- * Will return an array of function pointers to initialization functions
- */
-
-samba_init_module_fn *samba_modules_load(TALLOC_CTX *mem_ctx, const char *subsystem)
-{
- char *path = modules_path(mem_ctx, subsystem);
- samba_init_module_fn *ret;
-
- ret = load_modules(mem_ctx, path);
-
- talloc_free(path);
-
- return ret;
-}
-
-
-/* Load a dynamic module. Only log a level 0 error if we are not checking
- for the existence of a module (probling). */
-
-static NTSTATUS do_smb_load_module(const char *module_name, bool is_probe)
-{
- void *handle;
- samba_init_module_fn init;
- NTSTATUS status;
-
- init = load_module(module_name, is_probe, &handle);
- if (!init) {
- return NT_STATUS_UNSUCCESSFUL;
- }
-
- DEBUG(2, ("Module '%s' loaded\n", module_name));
-
- status = init();
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("Module '%s' initialization failed: %s\n",
- module_name, get_friendly_nt_error_msg(status)));
- dlclose(handle);
- }
-
- return status;
-}
-
-/* Load all modules in list and return number of
- * modules that has been successfully loaded */
-int smb_load_modules(const char **modules)
-{
- int i;
- int success = 0;
-
- for(i = 0; modules[i]; i++){
- if(NT_STATUS_IS_OK(do_smb_load_module(modules[i], false))) {
- success++;
- }
- }
-
- DEBUG(2, ("%d modules successfully loaded\n", success));
-
- return success;
-}
-
-NTSTATUS smb_probe_module(const char *subsystem, const char *module)
-{
- char *full_path = NULL;
- TALLOC_CTX *ctx = talloc_stackframe();
- NTSTATUS status;
-
- /* Check for absolute path */
-
- /* if we make any 'samba multibyte string'
- calls here, we break
- for loading string modules */
-
- DEBUG(5, ("Probing module '%s'\n", module));
-
- if (module[0] == '/') {
- status = do_smb_load_module(module, true);
- TALLOC_FREE(ctx);
- return status;
- }
-
- full_path = talloc_asprintf(ctx,
- "%s/%s.%s",
- modules_path(ctx, subsystem),
- module,
- shlib_ext());
- if (!full_path) {
- TALLOC_FREE(ctx);
- return NT_STATUS_NO_MEMORY;
- }
-
- DEBUG(5, ("Probing module '%s': Trying to load from %s\n",
- module, full_path));
-
- status = do_smb_load_module(full_path, true);
-
- TALLOC_FREE(ctx);
- return status;
-}
git.samba.org / amitay / samba.git / blobdiff