r14592: Add support for loading shared modules to LDB.

(This used to be commit f10fae23f0685b2d9c6174596e1c66d799f02c52)

2 files changed, 52 insertions, 2 deletions

diff --git a/source4/lib/ldb/common/ldb.c b/source4/lib/ldb/common/ldb.c
index 9acf74535b..0d424ad601 100644
--- a/source4/lib/ldb/common/ldb.c
+++ b/source4/lib/ldb/common/ldb.c
@@ -102,15 +102,26 @@ static ldb_connect_fn ldb_find_backend(const char *url)
 int ldb_connect(struct ldb_context *ldb, const char *url, unsigned int flags, const char *options[])
 {
 	int ret;
+	char *backend;
 	ldb_connect_fn fn;
 
 	if (strchr(url, ':') != NULL) {
-		fn = ldb_find_backend(url);
+		backend = talloc_strndup(ldb, url, strchr(url, ':')-url);
 	} else {
 		/* Default to tdb */
-		fn = ldb_find_backend("tdb:");
+		backend = talloc_strdup(ldb, "tdb");
 	}
 
+	fn = ldb_find_backend(backend);
+
+	if (fn == NULL) {
+		if (ldb_try_load_dso(ldb, backend) == 0) {
+			fn = ldb_find_backend(backend);
+		}
+	}
+
+	talloc_free(backend);
+
 	if (fn == NULL) {
 		ldb_debug(ldb, LDB_DEBUG_FATAL, "Unable to find backend for '%s'\n", url);
 		return LDB_ERR_OTHER;
diff --git a/source4/lib/ldb/common/ldb_modules.c b/source4/lib/ldb/common/ldb_modules.c
index 0cb0041d84..6ba5fbbc20 100644
--- a/source4/lib/ldb/common/ldb_modules.c
+++ b/source4/lib/ldb/common/ldb_modules.c
@@ -195,6 +195,39 @@ int ldb_register_module(const struct ldb_module_ops *ops)
 	return 0;
 }
 
+int ldb_try_load_dso(struct ldb_context *ldb, const char *name)
+{
+	char *path;
+	void *handle;
+	int (*init_fn) (void);
+
+#ifdef HAVE_DLOPEN
+	path = talloc_asprintf(ldb, "%s/%s.%s", MODULESDIR, name, SHLIBEXT);
+
+	ldb_debug(ldb, LDB_DEBUG_TRACE, "trying to load %s from %s\n", name, path);
+
+	handle = dlopen(path, 0);
+	if (handle == NULL) {
+		ldb_debug(ldb, LDB_DEBUG_WARNING, "unable to load %s from %s: %s\n", name, path, dlerror());
+		return -1;
+	}
+
+	init_fn = dlsym(handle, "init_module");
+
+	if (init_fn == NULL) {
+		ldb_debug(ldb, LDB_DEBUG_ERROR, "no symbol `init_module' found in %s: %s\n", path, dlerror());
+		return -1;
+	}
+
+	talloc_free(path);
+
+	return init_fn();
+#else
+	ldb_debug(ldb, LDB_DEBUG_TRACE, "no dlopen() - not trying to load %s module\n", name);
+	return -1;
+#endif
+}
+
 int ldb_load_modules(struct ldb_context *ldb, const char *options[])
 {
 	char **modules = NULL;
@@ -253,6 +286,12 @@ int ldb_load_modules(struct ldb_context *ldb, const char *options[])
 				
 			ops = ldb_find_module_ops(modules[i]);
 			if (ops == NULL) {
+				if (ldb_try_load_dso(ldb, modules[i]) == 0) {
+					ops = ldb_find_module_ops(modules[i]);
+				}
+			}
+			
+			if (ops == NULL) {
 				ldb_debug(ldb, LDB_DEBUG_WARNING, "WARNING: Module [%s] not found\n", 
 					  modules[i]);
 				continue;