Function TrySetUpIPV6Socket

test/host/socket/wasi_socket.cpp:34–72

XXX: Set up a socket with address ::1 to test if IPv6 is available. It prevents system calls like sysctl net.ipv6.conf.all.disable_ipv6. However, the port used in TEST cannot be the same as TrySetUpIPV6Socket because it does not set up SO_REUSEADDR=1 and may cause the test to fail.

//      TrySetUpIPV6Socket because it does not set up SO_REUSEADDR=1 and may
//      cause the test to fail.
bool TrySetUpIPV6Socket() {
  bool State = false;

#if WASMEDGE_OS_WINDOWS
  WSADATA_ WSAData;
  WSAStartup(0x0202, &WSAData);
  const SOCKET_ ErrFd = INVALID_SOCKET_;
  SOCKET_ Fd;
#else
  const int ErrFd = -1;
  int Fd;
#endif

  do {
    Fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP);
    if (Fd == ErrFd)
      break;

    struct sockaddr_in6 Sock6;
    std::memset(&Sock6, 0, sizeof(Sock6));
    Sock6.sin6_family = AF_INET6;
    Sock6.sin6_port = htons(10000);
    Sock6.sin6_addr = in6addr_loopback;

    if (bind(Fd, reinterpret_cast<sockaddr *>(&Sock6), sizeof(Sock6)) < 0)
      break;

    State = true;
  } while (false);

#if WASMEDGE_OS_WINDOWS
  closesocket(Fd);
  WSACleanup();
#else
  close(Fd);
#endif

  return State;
}

bool TestIPv6Enabled() {
  static bool Resolved = false;