IP4.hpp

   1 #ifndef IP4_DOT_HPP
   2 #define IP4_DOT_HPP
   3
   4 #include <string>
   5 #include <string_view>
   6 #include <vector>
   7
   8 #include <glog/logging.h>
   9
  10 namespace IP4 {
  11 using namespace std::literals::string_view_literals;
  12
  13 auto is_private(std::string_view addr) -> bool;
  14 auto is_address(std::string_view addr) -> bool;
  15 auto is_address_literal(std::string_view addr) -> bool;
  16 auto to_address_literal(std::string_view addr) -> std::string;
  17 auto reverse(std::string_view addr) -> std::string;
  18 auto fcrdns(std::string_view addr) -> std::vector<std::string>;
  19
  20 auto constexpr lit_pfx{"["sv};
  21 auto constexpr lit_pfx_sz{std::size(lit_pfx)};
  22
  23 auto constexpr lit_sfx{"]"sv};
  24 auto constexpr lit_sfx_sz{std::size(lit_sfx)};
  25
  26 auto constexpr lit_extra_sz{lit_pfx_sz + lit_sfx_sz};
  27
  28 auto constexpr loopback_literal{"[127.0.0.1]"sv};
  29
  30 constexpr auto as_address(std::string_view address_literal) -> std::string_view
  31 {
  32   CHECK(is_address_literal(address_literal));
  33   return address_literal.substr(lit_pfx_sz,
  34                                 address_literal.length() - lit_extra_sz);
  35 }
  36
  37 } // namespace IP4
  38
  39 #endif // IP4_DOT_HPP