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diff --git a/node/RuntimeEnvironment.hpp b/node/RuntimeEnvironment.hpp
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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef _ZT_RUNTIMEENVIRONMENT_HPP
+#define _ZT_RUNTIMEENVIRONMENT_HPP
+
+#include <string>
+#include "Identity.hpp"
+
+namespace ZeroTier {
+
+class NodeConfig;
+class Logger;
+class Demarc;
+class Switch;
+class Topology;
+class SysEnv;
+
+/**
+ * Holds global state for an instance of ZeroTier::Node
+ * 
+ * I do not believe in mutable static variables, period, or in global static
+ * instances of objects that don't basically represent constants. It makes
+ * unit testing, embedding, threading, and other things hard and is poor
+ * practice.
+ * 
+ * So we put everything that we would want to be global, like Logger, here
+ * and we give everybody this as _r. The Node creates and initializes this
+ * on startup and deletes things on shutdown.
+ */
+class RuntimeEnvironment
+{
+public:
+	RuntimeEnvironment() :
+		identity(),
+		log((Logger *)0),
+		nc((NodeConfig *)0),
+		demarc((Demarc *)0),
+		sw((Switch *)0),
+		topology((Topology *)0)
+	{
+	}
+
+	std::string homePath;
+	std::string autoconfUrlPrefix;
+	std::string configAuthorityIdentityStr;
+	std::string ownershipVerificationSecret;
+	std::string ownershipVerificationSecretHash; // base64 of SHA-256 X16 rounds
+
+	Identity configAuthority;
+	Identity identity;
+
+	Logger *log; // may be null
+	NodeConfig *nc;
+	Demarc *demarc;
+	Switch *sw;
+	Topology *topology;
+	SysEnv *sysEnv;
+};
+
+} // namespace ZeroTier
+
+#endif