1 files changed, 54 insertions, 0 deletions
diff --git a/src/lib/dns/qid_gen.h b/src/lib/dns/qid_gen.h
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+++ b/src/lib/dns/qid_gen.h
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+// Copyright (C) 2011-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// qid_gen defines a generator for query id's
+//
+// We probably want to merge this with the weighted random in the nsas
+// (and other parts where we need randomness, perhaps another thing
+// for a general libutil?)
+
+#ifndef QID_GEN_H
+#define QID_GEN_H
+
+#include <cryptolink/crypto_rng.h>
+#include <stdint.h>
+
+namespace isc {
+namespace dns {
+
+/// This class generates Qids for outgoing queries
+///
+/// It is implemented as a singleton; the public way to access it
+/// is to call getInstance()->generateQid().
+///
+/// It automatically seeds it with the current time when it is first
+/// used.
+class QidGenerator {
+public:
+    /// \brief Returns the singleton instance of the QidGenerator
+    ///
+    /// Returns a reference to the singleton instance of the generator
+    static QidGenerator& getInstance();
+
+    /// \brief Default constructor
+    ///
+    /// It is recommended that getInstance is used rather than creating
+    /// separate instances of this class.
+    ///
+    /// The constructor automatically seeds the generator with the
+    /// current time.
+    QidGenerator();
+
+    /// Generate a Qid
+    ///
+    /// \return A random Qid
+    uint16_t generateQid();
+};
+
+} // namespace dns
+} // namespace isc
+
+#endif // QID_GEN_H