More work on tags and capabilities.

node/Capability.cpp

@@ -0,0 +1,52 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * 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/>.
+ */
+
+#include "Capability.hpp"
+#include "RuntimeEnvironment.hpp"
+#include "Identity.hpp"
+#include "Topology.hpp"
+#include "Switch.hpp"
+
+namespace ZeroTier {
+
+int Capability::verify(const RuntimeEnvironment *RR) const
+{
+	try {
+		Buffer<(sizeof(Capability) * 2)> tmp;
+		this->serialize(tmp,true);
+		for(unsigned int c=0;c<ZT_MAX_CAPABILITY_CUSTODY_CHAIN_LENGTH;++c) {
+			if (!_custody[c].to)
+				return ((c == 0) ? -1 : 0);
+			if (!_custody[c].from)
+				return -1;
+			const Identity id(RR->topology->getIdentity(_custody[c].from));
+			if (id) {
+				if (!id.verify(tmp.data(),tmp.size(),_custody[c].signature))
+					return -1;
+			} else {
+				RR->sw->requestWhois(_custody[c].from);
+				return 1;
+			}
+		}
+		return 0;
+	} catch ( ... ) {
+		return -1;
+	}
+}
+
+} // namespace ZeroTier