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engine/sv_ipratelimit.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: rate limits OOB server queries
+//
+//=============================================================================//
+
+#ifndef SVIPRATELIMIT_H
+#define SVIPRATELIMIT_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "netadr.h"
+#include "sv_ipratelimit.h"
+#include "convar.h"
+#include "utlrbtree.h"
+
+class CIPRateLimit
+{
+public:
+	CIPRateLimit(ConVar *maxSec, ConVar *maxWindow, ConVar *maxSecGlobal);
+	~CIPRateLimit();
+
+	// updates an ip entry, return true if the ip is allowed, false otherwise
+	bool CheckIP( netadr_t ip );
+
+private:
+	bool CheckIPInternal( netadr_t ip );
+
+	enum { MAX_TREE_SIZE = 32768, START_TREE_SIZE = 2048, FLUSH_TIMEOUT = 120 };
+
+	typedef int ip_t;
+	struct iprate_s
+	{
+		ip_t ip;
+		long lastTime;
+		int count;
+	};
+
+	static bool LessIP( const struct CIPRateLimit::iprate_s &lhs, const struct CIPRateLimit::iprate_s &rhs );
+
+	CUtlRBTree< struct iprate_s, ip_t > m_IPTree;
+	int m_iGlobalCount;
+	long m_lLastTime;
+	double m_flFlushTime;
+
+	ConVar *m_maxSec;
+	ConVar *m_maxWindow;
+	ConVar *m_maxSecGlobal;
+};
+
+// returns false if this IP exceeds rate limits
+bool CheckConnectionLessRateLimits( netadr_t & adr );
+
+#endif // SVIPRATELIMIT_H