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/*
This file is part of GNUnet.
Copyright (C) 2011, 2016 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file src/nat/nat.h
* @brief Messages for interaction with gnunet-nat-server and gnunet-nat-service
* @author Christian Grothoff
*
*/
#ifndef NAT_H
#define NAT_H
#include "gnunet_util_lib.h"
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Request to test NAT traversal, sent to the gnunet-nat-server
* (not the service!).
*/
struct GNUNET_NAT_TestMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_TEST
*/
struct GNUNET_MessageHeader header;
/**
* IPv4 target IP address
*/
uint32_t dst_ipv4;
/**
* Port to use, 0 to send dummy ICMP response.
*/
uint16_t dport;
/**
* Data to send OR advertised-port (in NBO) to use for dummy ICMP.
*/
uint16_t data;
/**
* #GNUNET_YES for TCP, #GNUNET_NO for UDP.
*/
int32_t is_tcp;
};
/**
* Flags specifying the events this client would be
* interested in being told about.
*/
enum GNUNET_NAT_RegisterFlags
{
/**
* This client does not want any notifications.
*/
GNUNET_NAT_RF_NONE = 0,
/**
* This client wants to be informed about changes to our
* applicable addresses.
*/
GNUNET_NAT_RF_ADDRESSES = 1,
/**
* This client supports address reversal.
*/
GNUNET_NAT_RF_REVERSAL = 2
};
/**
* Message sent by a client to register with its addresses.
*/
struct GNUNET_NAT_RegisterMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_REGISTER
*/
struct GNUNET_MessageHeader header;
/**
* An `enum GNUNET_NAT_RegisterFlags`.
*/
uint8_t flags;
/**
* Client's IPPROTO, e.g. IPPROTO_UDP or IPPROTO_TCP.
*/
uint8_t proto;
/**
* Number of bytes in the string that follow which
* specifies a section name in the configuration.
*/
uint16_t str_len GNUNET_PACKED;
/**
* Number of addresses that this service is bound to that follow.
* Given as an array of "struct sockaddr" entries, the size of
* each entry being determined by the "sa_family" at the beginning.
*/
uint16_t num_addrs GNUNET_PACKED;
/* Followed by @e num_addrs addresses of type 'struct
sockaddr' */
/* Followed by @e str_len section name to use for options */
};
/**
* Client telling the service to (possibly) handle a STUN message.
*/
struct GNUNET_NAT_HandleStunMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_HANDLE_STUN
*/
struct GNUNET_MessageHeader header;
/**
* Size of the sender address included, in NBO.
*/
uint16_t sender_addr_size;
/**
* Number of bytes of payload included, in NBO.
*/
uint16_t payload_size;
/* followed by a `struct sockaddr` of @e sender_addr_size bytes */
/* followed by payload with @e payload_size bytes */
};
/**
* Client asking the service to initiate connection reversal.
*/
struct GNUNET_NAT_RequestConnectionReversalMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_REQUEST_CONNECTION_REVERSAL
*/
struct GNUNET_MessageHeader header;
/**
* Size of the local address included, in NBO.
*/
uint16_t local_addr_size;
/**
* Size of the remote address included, in NBO.
*/
uint16_t remote_addr_size;
/* followed by a `struct sockaddr` of @e local_addr_size bytes */
/* followed by a `struct sockaddr` of @e remote_addr_size bytes */
};
/**
* Service telling a client that connection reversal was requested.
*/
struct GNUNET_NAT_ConnectionReversalRequestedMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_CONNECTION_REVERSAL_REQUESTED
*/
struct GNUNET_MessageHeader header;
/* followed by a `struct sockaddr_in` */
};
/**
* Service notifying the client about changes in the set of
* addresses it has.
*/
struct GNUNET_NAT_AddressChangeNotificationMessage
{
/**
* Header with type #GNUNET_MESSAGE_TYPE_NAT_ADDRESS_CHANGE
*/
struct GNUNET_MessageHeader header;
/**
* #GNUNET_YES to add, #GNUNET_NO to remove the address from the list.
*/
int32_t add_remove GNUNET_PACKED;
/**
* Type of the address, an `enum GNUNET_NAT_AddressClass` in NBO.
*/
uint32_t addr_class GNUNET_PACKED;
/* followed by a `struct sockaddr` */
};
GNUNET_NETWORK_STRUCT_END
#endif
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