import HEAD into svn+ssh://svn.samba.org/home/svn/samba/trunk

[metze/old/v3-2-winbind-ndr.git] / source / sam / gums.c

diff --git a/source/sam/gums.c b/source/sam/gums.c
new file mode 100644 (file)
index 0000000..b719153
--- /dev/null
+++ b/source/sam/gums.c
@@ -0,0 +1,173 @@
+/*
+   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;
+}