text: /* Copyright  (C) 2010-2018 The RetroArch team
   *
   * ---------------------------------------------------------------------------------------
   * The following license statement only applies to this file (net_natt.h).
   * ---------------------------------------------------------------------------------------
   *
   * Permission is hereby granted, free of charge,
   * to any person obtaining a copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
   * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
   * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef _LIBRETRO_SDK_NET_NATT_H
  #define _LIBRETRO_SDK_NET_NATT_H
  
  #include <net/net_compat.h>
  #include <net/net_socket.h>
  
  #include <retro_common_api.h>
  
  RETRO_BEGIN_DECLS
  
  struct natt_status
  {
     /** nfds for select when checking for input */
     int nfds;
  
     /** The fdset to be selected upon to check for responses */
     fd_set fds;
  
     /** True if there might be a request outstanding */
     bool request_outstanding;
  
     /** True if we've resolved an external IPv4 address */
     bool have_inet4;
  
     /** External IPv4 address */
     struct sockaddr_in ext_inet4_addr;
  
     /** True if we've resolved an external IPv6 address */
     bool have_inet6;
  
  #if defined(AF_INET6) && !defined(HAVE_SOCKET_LEGACY)
     /** External IPv6 address */
     struct sockaddr_in6 ext_inet6_addr;
  #endif
  
     /** Internal status (currently unused) */
     void *internal;
  };
  
  /**
   * Initialize global NAT traversal structures (must be called once to use other
   * functions) */
  void natt_init(void);
  
  /** Initialize a NAT traversal status object */
  bool natt_new(struct natt_status *status);
  
  /** Free a NAT traversal status object */
  void natt_free(struct natt_status *status);
  
  /**
   * Make a port forwarding request when only the port is known. Forwards any
   * address it can find. */
  bool natt_open_port_any(struct natt_status *status, uint16_t port,
     enum socket_protocol proto);
  
  /** Check for port forwarding responses */
  bool natt_read(struct natt_status *status);
  
  RETRO_END_DECLS
  
  #endif
  