/*
     This file is part of GNUnet.
     Copyright (C) 2009, 2015 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/

/**
 * Testcase for STUN server resolution
 *
 * @file nat/nat_stun.h
 * @brief Testcase for STUN library
 * @author Bruno Souza Cabral
 * @autor Mark Spencer (Original code borrowed from Asterisk)
 *
 */


#define STUN_IGNORE		(0)
#define STUN_ACCEPT		(1)

#define STUN_MAGIC_COOKIE	0x2112A442

typedef struct { uint32_t id[3]; } GNUNET_PACKED stun_trans_id;

struct stun_header
{
  uint16_t msgtype;
  uint16_t msglen;
  uint32_t magic;
  stun_trans_id id;
} GNUNET_PACKED;

struct stun_attr
{
  uint16_t attr;
  uint16_t len;
} GNUNET_PACKED;

/*
 * The format normally used for addresses carried by STUN messages.
 */
struct stun_addr
{
  uint8_t  unused;
  uint8_t  family;
  uint16_t port;
  uint32_t   addr;
} GNUNET_PACKED;



/* STUN message classes */
enum StunClasses {
    INVALID_CLASS = 0,
    STUN_REQUEST = 0x0000,
    STUN_INDICATION = 0x0001,
    STUN_RESPONSE = 0x0002,
    STUN_ERROR_RESPONSE = 0x0003
};

enum StunMethods {
  INVALID_METHOD = 0,
  STUN_BINDING = 0x0001,
  STUN_SHARED_SECRET = 0x0002,
  STUN_ALLOCATE = 0x0003,
  STUN_REFRESH = 0x0004,
  STUN_SEND = 0x0006,
  STUN_DATA = 0x0007,
  STUN_CREATE_PERMISSION = 0x0008,
  STUN_CHANNEL_BIND = 0x0009
};

/* Basic attribute types in stun messages.
 * Messages can also contain custom attributes (codes above 0x7fff)
 */
enum StunAttributes {
  STUN_MAPPED_ADDRESS = 0x0001,
  STUN_RESPONSE_ADDRESS = 0x0002,
  STUN_CHANGE_ADDRESS = 0x0003,
  STUN_SOURCE_ADDRESS = 0x0004,
  STUN_CHANGED_ADDRESS = 0x0005,
  STUN_USERNAME = 0x0006,
  STUN_PASSWORD = 0x0007,
  STUN_MESSAGE_INTEGRITY = 0x0008,
  STUN_ERROR_CODE = 0x0009,
  STUN_UNKNOWN_ATTRIBUTES = 0x000a,
  STUN_REFLECTED_FROM = 0x000b,
  STUN_REALM = 0x0014,
  STUN_NONCE = 0x0015,
  STUN_XOR_MAPPED_ADDRESS = 0x0020,
  STUN_MS_VERSION = 0x8008,
  STUN_MS_XOR_MAPPED_ADDRESS = 0x8020,
  STUN_SOFTWARE = 0x8022,
  STUN_ALTERNATE_SERVER = 0x8023,
  STUN_FINGERPRINT = 0x8028
};