Modular sudo front-end which loads policy and I/O plugins that do

most the actual work.  Currently relies on dynamic loading using
dlopen().  See doc/plugin.pod for the plugin API.

src/sudo_plugin_int.h

@@ -0,0 +1,39 @@
+#ifndef _SUDO_PLUGIN_INT_H
+#define _SUDO_PLUGIN_INT_H
+
+/*
+ * Sudo plugin internals.
+ */
+
+struct plugin_info {
+    struct plugin_info *prev; /* required */
+    struct plugin_info *next; /* required */
+    const char *path;
+    const char *symbol_name;
+};
+TQ_DECLARE(plugin_info)
+
+struct plugin_container {
+    struct plugin_container *prev; /* required */
+    struct plugin_container *next; /* required */
+    const char *name;
+    void *handle;
+    union {
+	struct generic_plugin *generic;
+	struct policy_plugin *policy;
+	struct io_plugin *io;
+    } u;
+};
+TQ_DECLARE(plugin_container)
+
+extern struct plugin_container_list policy_plugins;
+extern struct plugin_container_list io_plugins;
+
+int sudo_conversation(int num_msgs, const struct sudo_conv_message msgs[],
+    struct sudo_conv_reply replies[]);
+
+void sudo_load_plugins(const char *conf_file,
+    struct plugin_container *policy_plugin,
+    struct plugin_container_list *io_plugins);
+
+#endif /* _SUDO_PLUGIN_INT_H */