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 namespace IP4 {
   9 auto is_private(std::string_view addr) -> bool;
  10 auto is_address(std::string_view addr) -> bool;
  11 auto is_address_literal(std::string_view addr) -> bool;
  12 auto to_address_literal(std::string_view addr) -> std::string;
  13 auto reverse(std::string_view addr) -> std::string;
  14 auto fcrdns(std::string_view addr) -> std::vector<std::string>;
  15
  16 constexpr char lit_pfx[] = "[";
  17 constexpr auto lit_pfx_sz{sizeof(lit_pfx) - 1};
  18
  19 constexpr char lit_sfx[] = "]";
  20 constexpr auto lit_sfx_sz{sizeof(lit_sfx) - 1};
  21
  22 constexpr auto lit_extra_sz{lit_pfx_sz + lit_sfx_sz};
  23
  24 constexpr auto loopback_literal{"[127.0.0.1]"};
  25
  26 constexpr auto as_address(std::string_view address_literal) -> std::string_view
  27 {
  28   // CHECK(is_address_literal(address_literal));
  29   return std::string_view(begin(address_literal) + lit_pfx_sz,
  30                           size(address_literal) - lit_extra_sz);
  31 }
  32
  33 } // namespace IP4
  34
  35 #endif // IP4_DOT_HPP