Add smb_register_passdb()

(This used to be commit b5b3b2e6bef431c9c30dc8f2899dc22328801c0e)

3 files changed, 60 insertions, 86 deletions

diff --git a/source3/include/passdb.h b/source3/include/passdb.h
index f63fd52e84..9436f255d4 100644
--- a/source3/include/passdb.h
+++ b/source3/include/passdb.h
@@ -156,6 +156,7 @@ struct pdb_init_function_entry {
 	char *name;
 	/* Function to create a member of the pdb_methods list */
 	pdb_init_function init;
+	struct pdb_init_function_entry *prev, *next;
 };
 
 #endif /* _PASSDB_H */
diff --git a/source3/passdb/pdb_interface.c b/source3/passdb/pdb_interface.c
index 88070d8694..2f79d305d3 100644
--- a/source3/passdb/pdb_interface.c
+++ b/source3/passdb/pdb_interface.c
@@ -25,8 +25,11 @@
 #define DBGC_CLASS DBGC_PASSDB
 
 /** List of various built-in passdb modules */
-
-const struct pdb_init_function_entry builtin_pdb_init_functions[] = {
+const struct {
+    char *name;
+    /* Function to create a member of the pdb_methods list */
+    pdb_init_function init;
+} builtin_pdb_init_functions[] = {
 	{ "smbpasswd", pdb_init_smbpasswd },
 	{ "smbpasswd_nua", pdb_init_smbpasswd_nua },
 	{ "tdbsam", pdb_init_tdbsam },
@@ -39,6 +42,50 @@ const struct pdb_init_function_entry builtin_pdb_init_functions[] = {
 	{ NULL, NULL}
 };
 
+static struct pdb_init_function_entry *backends;
+static void lazy_initialize_passdb(void);
+
+static void lazy_initialize_passdb()
+{
+	int i;
+	static BOOL initialised = False;
+	
+	if(!initialised) {
+		initialised = True;
+
+		for(i = 0; builtin_pdb_init_functions[i].name; i++) {
+			smb_register_passdb(builtin_pdb_init_functions[i].name, builtin_pdb_init_functions[i].init, PASSDB_INTERFACE_VERSION);
+		}
+	}
+}
+
+BOOL smb_register_passdb(char *name, pdb_init_function init, int version) 
+{
+	struct pdb_init_function_entry *entry = backends;
+
+	if(version != PASSDB_INTERFACE_VERSION)
+		return False;
+
+	DEBUG(5,("Attempting to register passdb backend %s\n", name));
+
+	/* Check for duplicates */
+	while(entry) { 
+		if(strcasecmp(name, entry->name) == 0) { 
+			DEBUG(0,("There already is a passdb backend registered with the name %s!\n", name));
+			return False;
+		}
+		entry = entry->next;
+	}
+
+	entry = smb_xmalloc(sizeof(struct pdb_init_function_entry));
+	entry->name = name;
+	entry->init = init;
+
+	DLIST_ADD(backends, entry);
+	DEBUG(5,("Successfully added passdb backend '%s'\n", name));
+	return True;
+}
+
 static NTSTATUS context_setsampwent(struct pdb_context *context, BOOL update)
 {
 	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
@@ -371,8 +418,12 @@ static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_c
 {
 	char *module_name = smb_xstrdup(selected);
 	char *module_location = NULL, *p;
+	struct pdb_init_function_entry *entry;
 	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
-	int i;
+
+	lazy_initialize_passdb();
+
+	entry = backends;
 
 	p = strchr(module_name, ':');
 
@@ -385,12 +436,11 @@ static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_c
 	trim_string(module_name, " ", " ");
 
 	DEBUG(5,("Attempting to find an passdb backend to match %s (%s)\n", selected, module_name));
-	for (i = 0; builtin_pdb_init_functions[i].name; i++)
-	{
-		if (strequal(builtin_pdb_init_functions[i].name, module_name))
+	while(entry) {
+		if (strequal(entry->name, module_name))
 		{
-			DEBUG(5,("Found pdb backend %s (at pos %d)\n", module_name, i));
-			nt_status = builtin_pdb_init_functions[i].init(context, methods, module_location);
+			DEBUG(5,("Found pdb backend %s\n", module_name));
+			nt_status = entry->init(context, methods, module_location);
 			if (NT_STATUS_IS_OK(nt_status)) {
 				DEBUG(5,("pdb backend %s has a valid init\n", selected));
 			} else {
@@ -400,6 +450,7 @@ static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_c
 			return nt_status;
 			break; /* unreached */
 		}
+		entry = entry->next;
 	}
 
 	/* No such backend found */
diff --git a/source3/passdb/pdb_plugin.c b/source3/passdb/pdb_plugin.c
deleted file mode 100644
index ea67da23a5..0000000000
--- a/source3/passdb/pdb_plugin.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/* 
-   Unix SMB/CIFS implementation.
-   Loadable passdb module interface.
-   Copyright (C) Jelmer Vernooij 2002
-   Copyright (C) Andrew Bartlett 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_PASSDB
-
-NTSTATUS pdb_init_plugin(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
-{
-	void * dl_handle;
-	char *plugin_location, *plugin_name, *p;
-	pdb_init_function plugin_init;
-	int (*plugin_version)(void);
-
-	if (location == NULL) {
-		DEBUG(0, ("The plugin module needs an argument!\n"));
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-
-	plugin_name = smb_xstrdup(location);
-	p = strchr(plugin_name, ':');
-	if (p) {
-		*p = 0;
-		plugin_location = p+1;
-		trim_string(plugin_location, " ", " ");
-	} else plugin_location = NULL;
-	trim_string(plugin_name, " ", " ");
-
-	DEBUG(5, ("Trying to load sam plugin %s\n", plugin_name));
-	dl_handle = sys_dlopen(plugin_name, RTLD_NOW );
-	if (!dl_handle) {
-		DEBUG(0, ("Failed to load sam plugin %s using sys_dlopen (%s)\n", plugin_name, sys_dlerror()));
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-    
-	plugin_version = sys_dlsym(dl_handle, "pdb_version");
-	if (!plugin_version) {
-		sys_dlclose(dl_handle);
-		DEBUG(0, ("Failed to find function 'pdb_version' using sys_dlsym in sam plugin %s (%s)\n", plugin_name, sys_dlerror()));	    
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-
-	if (plugin_version() != PASSDB_INTERFACE_VERSION) {
-		sys_dlclose(dl_handle);
-		DEBUG(0, ("Wrong PASSDB_INTERFACE_VERSION! sam plugin has version %d and version %d is needed! Please update!\n",
-			    plugin_version(),PASSDB_INTERFACE_VERSION));
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-				    	
-	plugin_init = sys_dlsym(dl_handle, "pdb_init");
-	if (!plugin_init) {
-		sys_dlclose(dl_handle);
-		DEBUG(0, ("Failed to find function 'pdb_init' using sys_dlsym in sam plugin %s (%s)\n", plugin_name, sys_dlerror()));	    
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-
-	DEBUG(5, ("Starting sam plugin %s with location %s\n", plugin_name, plugin_location));
-	return plugin_init(pdb_context, pdb_method, plugin_location);
-}