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/*
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
*/
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 = (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 (init_module_fn)init_fn;
}
/**
* Obtain list of init functions from the modules in the specified
* directory
*/
static init_module_fn *load_modules(TALLOC_CTX *mem_ctx, const char *path)
{
DIR *dir;
struct dirent *entry;
char *filename;
int success = 0;
init_module_fn *ret = talloc_array(mem_ctx, 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, 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 run_init_functions(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
*/
init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
{
char *path = modules_path(mem_ctx, subsystem);
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 *subsystem,
const char *module_name, bool is_probe)
{
void *handle;
init_module_fn init;
NTSTATUS status;
char *full_path = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
/* Check for absolute path */
DEBUG(5, ("%s module '%s'\n", is_probe ? "Probing" : "Loading", module_name));
if (subsystem && module_name[0] != '/') {
full_path = talloc_asprintf(ctx,
"%s/%s.%s",
modules_path(ctx, subsystem),
module_name,
shlib_ext());
if (!full_path) {
TALLOC_FREE(ctx);
return NT_STATUS_NO_MEMORY;
}
DEBUG(5, ("%s module '%s': Trying to load from %s\n",
is_probe ? "Probing": "Loading", module_name, full_path));
init = load_module(full_path, is_probe, &handle);
} else {
init = load_module(module_name, is_probe, &handle);
}
if (!init) {
TALLOC_FREE(ctx);
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);
}
TALLOC_FREE(ctx);
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(NULL, modules[i], false))) {
success++;
}
}
DEBUG(2, ("%d modules successfully loaded\n", success));
return success;
}
NTSTATUS smb_probe_module(const char *subsystem, const char *module)
{
return do_smb_load_module(subsystem, module, true);
}
NTSTATUS smb_load_module(const char *subsystem, const char *module)
{
return do_smb_load_module(subsystem, module, false);
}
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