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  1. /*
  2. * This file is part of PowerDNS or dnsdist.
  3. * Copyright -- PowerDNS.COM B.V. and its contributors
  4. *
  5. * This program is free software; you can redistribute it and/or modify
  6. * it under the terms of version 2 of the GNU General Public License as
  7. * published by the Free Software Foundation.
  8. *
  9. * In addition, for the avoidance of any doubt, permission is granted to
  10. * link this program with OpenSSL and to (re)distribute the binaries
  11. * produced as the result of such linking.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21. */
  22. #pragma once
  23. #include <cstdint>
  24. #include <limits>
  25. void dns_random_init(const std::string& data = "", bool force_reinit = false);
  26. uint32_t dns_random(uint32_t n);
  27. uint16_t dns_random_uint16();
  28. namespace pdns {
  29. struct dns_random_engine {
  30. typedef uint32_t result_type;
  31. static constexpr result_type min()
  32. {
  33. return 0;
  34. }
  35. static constexpr result_type max()
  36. {
  37. return std::numeric_limits<result_type>::max() - 1;
  38. }
  39. result_type operator()()
  40. {
  41. return dns_random(std::numeric_limits<result_type>::max());
  42. }
  43. };
  44. }