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/*
Unix SMB/CIFS implementation.
module loading system
Copyright (C) Jelmer Vernooij 2002-2003
Copyright (C) Stefan (metze) Metzmacher 2003
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"
#ifdef HAVE_DLOPEN
/* 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;
init_module_function *init;
NTSTATUS status;
const char *error;
/* 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 = sys_dlopen(module_name, RTLD_LAZY);
/* This call should reset any possible non-fatal errors that
occured since last call to dl* functions */
error = sys_dlerror();
if(!handle) {
int level = is_probe ? 3 : 0;
DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : ""));
return NT_STATUS_UNSUCCESSFUL;
}
init = (init_module_function *)sys_dlsym(handle, "init_samba_module");
/* we must check sys_dlerror() to determine if it worked, because
sys_dlsym() can validly return NULL */
error = sys_dlerror();
if (error) {
DEBUG(0, ("Error trying to resolve symbol 'init_samba_module' "
"in %s: %s\n", module_name, error));
sys_dlclose(handle);
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)));
sys_dlclose(handle);
}
return status;
}
NTSTATUS smb_load_module(const char *module_name)
{
return do_smb_load_module(module_name, False);
}
/* 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(smb_load_module(modules[i]))) {
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",
lib_path(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;
}
#else /* HAVE_DLOPEN */
NTSTATUS smb_load_module(const char *module_name)
{
DEBUG(0,("This samba executable has not been built with plugin support\n"));
return NT_STATUS_NOT_SUPPORTED;
}
int smb_load_modules(const char **modules)
{
DEBUG(0,("This samba executable has not been built with plugin support\n"));
return -1;
}
NTSTATUS smb_probe_module(const char *subsystem, const char *module)
{
DEBUG(0,("This samba executable has not been built with plugin support, not probing\n"));
return NT_STATUS_NOT_SUPPORTED;
}
#endif /* HAVE_DLOPEN */
void init_modules(void)
{
/* FIXME: This can cause undefined symbol errors :
* smb_register_vfs() isn't available in nmbd, for example */
if(lp_preload_modules())
smb_load_modules(lp_preload_modules());
}
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