added a first implementation of a DNS name cache

this still has a couple of weaknesses, like no size limit, no expiration
of entries, suboptimal algorithms -- but it should perform better than
what we had previously. Implementation will be improved based on
feedback during the next couple of releases

1 files changed, 31 insertions, 0 deletions

diff --git a/runtime/dnscache.h b/runtime/dnscache.h
new file mode 100644
index 00000000..9eee07ba
--- /dev/null
+++ b/runtime/dnscache.h
@@ -0,0 +1,31 @@
+/* Definitions for dnscache module.
+ *
+ * Copyright 2011 by Rainer Gerhards and Adiscon GmbH.
+ *
+ * This file is part of the rsyslog runtime library.
+ *
+ * The rsyslog runtime library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The rsyslog runtime library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the rsyslog runtime library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * A copy of the GPL can be found in the file "COPYING" in this distribution.
+ * A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
+ */
+
+#ifndef INCLUDED_DNSCACHE_H
+#define INCLUDED_DNSCACHE_H
+
+rsRetVal dnscacheInit(void);
+rsRetVal dnscacheDeinit(void);
+rsRetVal dnscacheLookup(struct sockaddr_storage *addr, uchar *pszHostFQDN, uchar *ip);
+
+#endif /* #ifndef INCLUDED_DNSCACHE_H */