* Added a "user" parameter to plugin_credentials() restconf callback.

To enable authentication and in preparation for access control a la RFC 6536.
* yang string length "max" keyword set to MAXPATHLEN

lib/clixon/clixon_plugin.h

@@ -77,7 +77,10 @@ typedef int (plgexit_t)(clicon_handle);		       /* Plugin exit */
  * Returns 0 if credentials OK, -1 if failed
  */
 #define PLUGIN_CREDENTIALS      "plugin_credentials"
-typedef int (plgcredentials_t)(clicon_handle, void *); /* Plugin credentials */
+/* Plugin credentials 
+ * username should be freed after use
+ */
+typedef int (plgcredentials_t)(clicon_handle, void *, char **username);
 
 /* Find a function in global namespace or a plugin. XXX clicon internal */
 void *clicon_find_func(clicon_handle h, char *plugin, char *func);

lib/src/clixon_xml.c

@@ -1704,6 +1704,7 @@ xml_apply_ancestor(cxobj          *xn,
  * @param[out]  cvp      CLIgen variable containing the parsed value
  * @note free cv with cv_free after use.
  * @see xml_body_int32   etc, for type-specific parse functions
+ * @note range check failure returns 0
  */
 int
 xml_body_parse(cxobj       *xb,
@@ -1751,6 +1752,7 @@ xml_body_parse(cxobj       *xb,
  *                          alloc error.
  * @note extend to all other cligen var types and generalize
  * @note use yang type info?
+ * @note range check failure returns 0
  */
 int
 xml_body_int32(cxobj    *xb,
@@ -1774,6 +1776,7 @@ xml_body_int32(cxobj    *xb,
  *                          alloc error.
  * @note extend to all other cligen var types and generalize
  * @note use yang type info?
+ * @note range check failure returns 0
  */
 int
 xml_body_uint32(cxobj    *xb,