1 files changed, 72 insertions, 0 deletions
diff --git a/ednscookies.hh b/ednscookies.hh
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--- /dev/null
+++ b/ednscookies.hh
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+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+#include "namespaces.hh"
+#include "iputils.hh"
+
+struct EDNSCookiesOpt
+{
+  static const size_t EDNSCookieSecretSize = 32;
+  static const size_t EDNSCookieOptSize = 24;
+
+  EDNSCookiesOpt(){};
+  EDNSCookiesOpt(const std::string& option);
+  EDNSCookiesOpt(const char* option, unsigned int len);
+
+  bool makeFromString(const std::string& option);
+  bool makeFromString(const char* option, unsigned int len);
+
+  size_t size() const
+  {
+    return server.size() + client.size();
+  }
+
+  bool isWellFormed() const
+  {
+    // RFC7873 section 5.2.2
+    //    In summary, valid cookie lengths are 8 and 16 to 40 inclusive.
+    return (
+      client.size() == 8 && (server.size() == 0 || (server.size() >= 8 && server.size() <= 32)));
+  }
+
+  bool isValid(const string& secret, const ComboAddress& source) const;
+  bool makeServerCookie(const string& secret, const ComboAddress& source);
+  string makeOptString() const;
+  string getServer() const
+  {
+    return server;
+  }
+  string getClient() const
+  {
+    return client;
+  }
+
+private:
+  bool shouldRefresh() const;
+
+  // the client cookie
+  string client;
+  // the server cookie
+  string server;
+
+  void getEDNSCookiesOptFromString(const char* option, unsigned int len);
+};