Add the pdb_plugin module from Jelmer Vernooij <jelmer@nl.linux.org>.

This allow the user to select
'passdb backend = plugin : /path/to/plugin.so : pluging args'

And load any arbitary plugin.  Apparently Jelmer has a mysql plugin in the
works - hence this patch.

We probably need to rework the interface a bit before 3.0 (add versioning of
some kind) but this is a good start.

Andrew Bartlett
(This used to be commit d6d18b70f0c377344b0b3d9df5a11d209793bfe0)

2 files changed, 76 insertions, 3 deletions

diff --git a/source3/passdb/pdb_interface.c b/source3/passdb/pdb_interface.c
index 13d483fc25..73532984b6 100644
--- a/source3/passdb/pdb_interface.c
+++ b/source3/passdb/pdb_interface.c
@@ -22,7 +22,7 @@
 
 /** List of various built-in passdb modules */
 
-const struct pdb_init_function builtin_pdb_init_functions[] = {
+const struct pdb_init_function_entry builtin_pdb_init_functions[] = {
 	{ "smbpasswd", pdb_init_smbpasswd },
 	{ "smbpasswd_nua", pdb_init_smbpasswd_nua },
 	{ "tdbsam", pdb_init_tdbsam },
@@ -32,6 +32,7 @@ const struct pdb_init_function builtin_pdb_init_functions[] = {
 	{ "nisplus", pdb_init_nisplus },	
 	{ "unix", pdb_init_unix },
 #endif
+	{ "plugin", pdb_init_plugin },
 	{ NULL, NULL}
 };
 
@@ -198,7 +199,7 @@ NTSTATUS make_pdb_context_name(struct pdb_context **context, const char *selecte
 		return nt_status;
 	}
 	
-	DEBUG(5,("Attempting to find an passdb backend to match %s\n", selected));
+	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))
@@ -214,7 +215,7 @@ NTSTATUS make_pdb_context_name(struct pdb_context **context, const char *selecte
 			break;
 		}
 	}
-	
+    
 	if (!(*context)->pdb_selected) {
 		DEBUG(0,("failed to select passdb backed!\n"));
 		talloc_destroy((*context)->mem_ctx);
diff --git a/source3/passdb/pdb_plugin.c b/source3/passdb/pdb_plugin.c
new file mode 100644
index 0000000000..4ea4245398
--- /dev/null
+++ b/source3/passdb/pdb_plugin.c
@@ -0,0 +1,72 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Loadable passdb module interface.
+   Copyright (C) Jelmer Vernooij 2002
+   Copyright (C) Andrew Bartlett 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"
+
+#ifdef HAVE_LIBDL
+
+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;
+
+	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 | RTLD_GLOBAL );
+	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_init = sys_dlsym(dl_handle, "pdb_init");
+	if (!plugin_init){
+		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);
+}
+
+#else
+
+NTSTATUS pdb_init_plugin(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+{
+	DEBUG(0, ("pdb_init_plugin: No libdl present - cannot use passdb loadable modules\n"));
+	return NT_STATUS_UNSUCCESSFUL;
+}
+
+#endif