From bf3acfa61d702eef0303bc4743592669cebebabf Mon Sep 17 00:00:00 2001
From: brain <brain@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Mon, 8 Jan 2007 00:18:52 +0000
Subject: Add /CLEARCACHE, oper only command which completely purges the DNS
 cache -- useful if you just want to cut down on ram use at any point.

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@6259 e03df62e-2008-0410-955e-edbf42e46eb7
---
 include/commands/cmd_clearcache.h | 33 +++++++++++++++++++++++++++++++++
 include/dns.h                     |  2 ++
 src/cmd_clearcache.cpp            | 30 ++++++++++++++++++++++++++++++
 src/dns.cpp                       |  9 +++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 include/commands/cmd_clearcache.h
 create mode 100644 src/cmd_clearcache.cpp

diff --git a/include/commands/cmd_clearcache.h b/include/commands/cmd_clearcache.h
new file mode 100644
index 000000000..c575acf64
--- /dev/null
+++ b/include/commands/cmd_clearcache.h
@@ -0,0 +1,33 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
+ *                       E-mail:
+ *                <brain@chatspike.net>
+ *                <Craig@chatspike.net>
+ *
+ * Written by Craig Edwards, Craig McLure, and others.
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#ifndef __CMD_ADMIN_H__
+#define __CMD_ADMIN_H__
+
+#include "users.h"
+#include "channels.h"
+#include "ctables.h"
+
+/** Handle /ADMIN
+ */
+class cmd_clearcache : public command_t
+{
+ public:
+        cmd_clearcache (InspIRCd* Instance) : command_t(Instance,"CLEARCACHE",'o',0) { }
+        CmdResult Handle(const char** parameters, int pcnt, userrec *user);
+};
+
+#endif
diff --git a/include/dns.h b/include/dns.h
index c7283f6b8..8011d069c 100644
--- a/include/dns.h
+++ b/include/dns.h
@@ -448,6 +448,8 @@ class DNS : public EventHandler
 	CachedQuery* GetCache(const std::string &source);
 
 	void DelCache(const std::string &source);
+
+	int ClearCache();
 };
 
 #endif
diff --git a/src/cmd_clearcache.cpp b/src/cmd_clearcache.cpp
new file mode 100644
index 000000000..22e219a83
--- /dev/null
+++ b/src/cmd_clearcache.cpp
@@ -0,0 +1,30 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include "configreader.h"
+#include "users.h"
+#include "commands/cmd_admin.h"
+
+extern "C" command_t* init_command(InspIRCd* Instance)
+{
+	return new cmd_admin(Instance);
+}
+
+/** Handle /ADMIN
+ */
+CmdResult cmd_admin::Handle (const char** parameters, int pcnt, userrec *user)
+{
+	int n = ServerInstance->Res->ClearCache();
+	user->WriteServ("NOTICE %s :*** Cleared DNS cache of %d items.", user->nick, n);
+	return CMD_SUCCESS;
+}
diff --git a/src/dns.cpp b/src/dns.cpp
index 844077cf4..cea1c4a43 100644
--- a/src/dns.cpp
+++ b/src/dns.cpp
@@ -253,6 +253,15 @@ DNSRequest* DNS::AddQuery(DNSHeader *header, int &id, const char* original)
 	return req;
 }
 
+int DNS::ClearCache()
+{
+	/* This ensures the buckets are reset to sane levels */
+	int rv = this->cache->size();
+	delete this->cache;
+	this->cache = new dnscache();
+	return rv;
+}
+
 void DNS::Rehash()
 {
 	insp_inaddr addr;
-- 
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