1 files changed, 103 insertions, 0 deletions
diff --git a/idmap_plugin.c b/idmap_plugin.c
new file mode 100644
index 0000000..237c921
--- /dev/null
+++ b/idmap_plugin.c
@@ -0,0 +1,103 @@
+/*
+ * ID Mapping Plugin interface for cifs-utils
+ * Copyright (C) 2012 Jeff Layton (jlayton@samba.org)
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <stdint.h>
+
+#include "cifsidmap.h"
+
+const char *plugin_errmsg;
+static void *plugin;
+
+static void *
+resolve_symbol(const char *symbol_name)
+{
+	void *symbol;
+
+	dlerror();
+	symbol = dlsym(plugin, symbol_name);
+	if (!symbol)
+		plugin_errmsg = dlerror();
+	return symbol;
+}
+
+/*
+ * open the plugin. Note that we leave it open over the life of the
+ * program. It gets closed on exit.
+ */
+static int
+open_plugin(void)
+{
+	if (plugin)
+		return 0;
+
+	plugin = dlopen(IDMAP_PLUGIN_PATH, RTLD_LAZY);
+	if (!plugin) {
+		plugin_errmsg = dlerror();
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int
+init_plugin(void **handle)
+{
+	int ret;
+	int (*init)(void **, const char **);
+
+	ret = open_plugin();
+	if (ret)
+		return ret;
+
+	init = resolve_symbol("cifs_idmap_init_plugin");
+	if (!init) {
+		plugin_errmsg = "cifs_idmap_init_plugin not implemented";
+		return -ENOSYS;
+	}
+	return (*init)(handle, &plugin_errmsg);
+}
+
+void
+exit_plugin(void *handle)
+{
+	int (*exit)(void *);
+
+	exit = resolve_symbol("cifs_idmap_exit_plugin");
+	if (exit)
+		(*exit)(handle);
+}
+
+int
+sid_to_str(void *handle, const struct cifs_sid *sid, char **name)
+{
+	int (*entry)(void *, const struct cifs_sid *, char **);
+
+	*(void **)(&entry) = resolve_symbol("cifs_idmap_sid_to_str");
+	if (!entry) {
+		plugin_errmsg = "cifs_idmap_sid_to_str not implemented";
+		return -ENOSYS;
+	}
+
+	return (*entry)(handle, sid, name);
+}