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/*
Unix SMB/CIFS implementation.
Grops and Users Management System initializations.
Copyright (C) Simo Sorce 2002
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"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_SAM
#define GMV_MAJOR 0
#define GMV_MINOR 1
static GUMS_FUNCTIONS *gums_backend = NULL;
static struct gums_init_function_entry *backends = NULL;
static void lazy_initialize_gums(void)
{
static BOOL initialized = False;
if (initialized)
return;
static_init_gums;
initialized = True;
}
static struct gums_init_function_entry *gums_find_backend_entry(const char *name);
NTSTATUS gums_register_module(int version, const char *name, gums_init_function init_fn)
{
struct gums_init_function_entry *entry = backends;
if (version != GUMS_INTERFACE_VERSION) {
DEBUG(0,("Can't register gums backend!\n"
"You tried to register a gums module with"
"GUMS_INTERFACE_VERSION %d, while this version"
"of samba uses version %d\n", version,
GUMS_INTERFACE_VERSION));
return NT_STATUS_OBJECT_TYPE_MISMATCH;
}
if (!name || !init_fn) {
return NT_STATUS_INVALID_PARAMETER;
}
DEBUG(5,("Attempting to register gums backend %s\n", name));
/* Check for duplicates */
if (gums_find_backend_entry(name)) {
DEBUG(0,("There already is a gums backend registered"
"with the name %s!\n", name));
return NT_STATUS_OBJECT_NAME_COLLISION;
}
entry = smb_xmalloc(sizeof(struct gums_init_function_entry));
entry->name = smb_xstrdup(name);
entry->init_fn = init_fn;
DLIST_ADD(backends, entry);
DEBUG(5,("Successfully added gums backend '%s'\n", name));
return NT_STATUS_OK;
}
static struct gums_init_function_entry *gums_find_backend_entry(const char *name)
{
struct gums_init_function_entry *entry = backends;
while (entry) {
if (strcmp(entry->name, name) == 0)
return entry;
entry = entry->next;
}
return NULL;
}
NTSTATUS gums_setup_backend(const char *backend)
{
TALLOC_CTX *mem_ctx;
char *module_name = smb_xstrdup(backend);
char *p, *module_data = NULL;
struct gums_init_function_entry *entry;
NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
lazy_initialize_gums();
p = strchr(module_name, ':');
if (p) {
*p = 0;
module_data = p+1;
trim_string(module_data, " ", " ");
}
trim_string(module_name, " ", " ");
DEBUG(5,("Attempting to find a gums backend to match %s (%s)\n", backend, module_name));
entry = gums_find_backend_entry(module_name);
/* Try to find a module that contains this module */
if (!entry) {
DEBUG(2,("No builtin backend found, trying to load plugin\n"));
if(NT_STATUS_IS_OK(smb_probe_module("gums", module_name)) && !(entry = gums_find_backend_entry(module_name))) {
DEBUG(0,("Plugin is available, but doesn't register gums backend %s\n", module_name));
SAFE_FREE(module_name);
return NT_STATUS_UNSUCCESSFUL;
}
}
/* No such backend found */
if(!entry) {
DEBUG(0,("No builtin nor plugin backend for %s found\n", module_name));
SAFE_FREE(module_name);
return NT_STATUS_INVALID_PARAMETER;
}
DEBUG(5,("Found gums backend %s\n", module_name));
/* free current functions structure if any */
if (gums_backend) {
gums_backend->free_private_data(gums_backend->private_data);
talloc_destroy(gums_backend->mem_ctx);
gums_backend = NULL;
}
/* allocate a new GUMS_FUNCTIONS structure and memory context */
mem_ctx = talloc_init("gums_backend (%s)", module_name);
if (!mem_ctx)
return NT_STATUS_NO_MEMORY;
gums_backend = talloc(mem_ctx, sizeof(GUMS_FUNCTIONS));
if (!gums_backend)
return NT_STATUS_NO_MEMORY;
gums_backend->mem_ctx = mem_ctx;
/* init the requested backend module */
if (NT_STATUS_IS_OK(ret = entry->init_fn(gums_backend, module_data))) {
DEBUG(5,("gums backend %s has a valid init\n", backend));
} else {
DEBUG(0,("gums backend %s did not correctly init (error was %s)\n", backend, nt_errstr(ret)));
}
SAFE_FREE(module_name);
return ret;
}
NTSTATUS get_gums_fns(GUMS_FUNCTIONS **fns)
{
if (gums_backend != NULL) {
*fns = gums_backend;
return NT_STATUS_OK;
}
DEBUG(2, ("get_gums_fns: unable to get gums functions! backend uninitialized?\n"));
return NT_STATUS_UNSUCCESSFUL;
}
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