MENT-977 log priv host / priv user.

Add server functions to provide necessary data.

sql/sql_class.cc

@@ -4767,6 +4767,32 @@ extern "C" void thd_create_random_password(MYSQL_THD thd,
 }
 
 
+extern "C" const char *thd_priv_host(MYSQL_THD thd, size_t *length)
+{
+  const Security_context *sctx= thd->security_ctx;
+  if (!sctx)
+  {
+    *length= 0;
+    return NULL;
+  }
+  *length= strlen(sctx->priv_host);
+  return sctx->priv_host;
+}
+
+
+extern "C" const char *thd_priv_user(MYSQL_THD thd, size_t *length)
+{
+  const Security_context *sctx= thd->security_ctx;
+  if (!sctx)
+  {
+    *length= 0;
+    return NULL;
+  }
+  *length= strlen(sctx->priv_user);
+  return sctx->priv_user;
+}
+
+
 #ifdef INNODB_COMPATIBILITY_HOOKS
 
 /** open a table and add it to thd->open_tables

sql/sql_class.h

@@ -197,6 +197,8 @@ extern MYSQL_PLUGIN_IMPORT const char **errmesg;
 extern "C" LEX_STRING * thd_query_string (MYSQL_THD thd);
 extern "C" unsigned long long thd_query_id(const MYSQL_THD thd);
 extern "C" size_t thd_query_safe(MYSQL_THD thd, char *buf, size_t buflen);
+extern "C" const char *thd_priv_user(MYSQL_THD thd,  size_t *length);
+extern "C" const char *thd_priv_host(MYSQL_THD thd,  size_t *length);
 extern "C" const char *thd_user_name(MYSQL_THD thd);
 extern "C" const char *thd_client_host(MYSQL_THD thd);
 extern "C" const char *thd_client_ip(MYSQL_THD thd);