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/*
Unix SMB/CIFS implementation.
module loading system
Copyright (C) Jelmer Vernooij 2002-2004
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/dir.h"
#include "system/filesys.h"
#ifdef HAVE_DLOPEN
/* Load module (or directory with modules) recursively.
* Includes running the init_module() function */
NTSTATUS smb_load_module(const char *module_name)
{
void *handle;
init_module_function init;
NTSTATUS status;
const char *error;
struct stat st;
DIR *dir;
struct dirent *dirent;
if(stat(module_name, &st) < 0) {
DEBUG(0, ("Can't stat module '%s'\n", module_name));
return NT_STATUS_UNSUCCESSFUL;
}
/* If the argument is a directory, recursively load all files /
* directories in it */
/* How about symlinks pointing to themselves - wouldn't we rather
* want to use wildcards here? */
if(S_ISDIR(st.st_mode)) {
dir = opendir(module_name);
while ((dirent = readdir(dir))) {
smb_load_module(dirent->d_name);
}
}
/* 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);
if(!handle) {
DEBUG(0, ("Error loading module '%s': %s\n", module_name, sys_dlerror()));
return NT_STATUS_UNSUCCESSFUL;
}
init = (init_module_function)sys_dlsym(handle, "init_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_module' in %s: %s\n", module_name, error));
return NT_STATUS_UNSUCCESSFUL;
}
status = init();
DEBUG(2, ("Module '%s' loaded\n", module_name));
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(smb_load_module(modules[i]))) {
success++;
}
}
DEBUG(2, ("%d modules successfully loaded\n", success));
return success;
}
#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;
}
#endif /* HAVE_DLOPEN */
void init_modules(void)
{
if(lp_preload_modules())
smb_load_modules(lp_preload_modules());
}
struct subsystem {
char *name;
register_backend_function callback;
struct subsystem *prev, *next;
};
static struct subsystem *subsystems = NULL;
NTSTATUS register_subsystem(const char *name, register_backend_function callback)
{
struct subsystem *s;
struct subsystem *t = subsystems;
while(t) {
if(!strcmp(name, t->name)) {
/* its already registered! */
DEBUG(0,("Subsystem '%s' already registered\n", name));
return NT_STATUS_OBJECT_NAME_COLLISION;
}
t = t->next;
}
s = smb_xmalloc(sizeof(struct subsystem));
s->name = smb_xstrdup(name);
s->callback = callback;
s->prev = s->next = NULL;
DLIST_ADD(subsystems, s);
return NT_STATUS_OK;
}
NTSTATUS register_backend(const char *subsystem, const void *args)
{
/* Find the specified subsystem */
struct subsystem *s = subsystems;
while(s) {
if(!strcmp(subsystem, s->name)) return s->callback(args);
s = s->next;
}
DEBUG(0, ("Unable to register backend for subsystem '%s'\n", subsystem));
return NT_STATUS_NOT_IMPLEMENTED;
}
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