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/*
This file is part of GNUnet.
Copyright (C) 2007-2017 GNUnet e.V.
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.
*/
/**
* @author Christian Grothoff
* @author Milan Bouchet-Valat
*
* @file
* Service for testing and autoconfiguration of
* NAT traversal functionality
*
* @defgroup nat NAT testing library
*
* @{
*/
#ifndef GNUNET_NAT_AUTO_SERVICE_H
#define GNUNET_NAT_AUTO_SERVICE_H
#include "gnunet_util_lib.h"
/**
* Handle to a NAT test.
*/
struct GNUNET_NAT_Test;
/**
* Function called to report success or failure for
* NAT configuration test.
*
* @param cls closure
* @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
*/
typedef void
(*GNUNET_NAT_TestCallback) (void *cls,
enum GNUNET_NAT_StatusCode result);
/**
* Handle an incoming STUN message. This function is useful as
* some GNUnet service may be listening on a UDP port and might
* thus receive STUN messages while trying to receive other data.
* In this case, this function can be used to process replies
* to STUN requests.
*
* The function does some basic sanity checks on packet size and
* content, try to extract a bit of information.
*
* At the moment this only processes BIND requests, and returns the
* externally visible address of the request to the rest of the
* NAT logic.
*
* @param nh handle to the NAT service
* @param sender_addr address from which we got @a data
* @param sender_addr_len number of bytes in @a sender_addr
* @param data the packet
* @param data_size number of bytes in @a data
* @return #GNUNET_OK on success
* #GNUNET_NO if the packet is not a STUN packet
* #GNUNET_SYSERR on internal error handling the packet
*/
int
GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nh,
const struct sockaddr *sender_addr,
size_t sender_addr_len,
const void *data,
size_t data_size);
/**
* Handle to a request given to the resolver. Can be used to cancel
* the request prior to the timeout or successful execution. Also
* used to track our internal state for the request.
*/
struct GNUNET_NAT_STUN_Handle;
/**
* Make Generic STUN request. Sends a generic stun request to the
* server specified using the specified socket. If we do this,
* we need to watch for possible responses and call
* #GNUNET_NAT_stun_handle_packet() on incoming packets.
*
* @param server the address of the stun server
* @param port port of the stun server, in host byte order
* @param sock the socket used to send the request, must be a
* UDP socket
* @param cb callback in case of error
* @param cb_cls closure for @a cb
* @return NULL on error
*/
struct GNUNET_NAT_STUN_Handle *
GNUNET_NAT_stun_make_request (const char *server,
uint16_t port,
struct GNUNET_NETWORK_Handle *sock,
GNUNET_NAT_TestCallback cb,
void *cb_cls);
/**
* Cancel active STUN request. Frees associated resources
* and ensures that the callback is no longer invoked.
*
* @param rh request to cancel
*/
void
GNUNET_NAT_stun_make_request_cancel (struct GNUNET_NAT_STUN_Handle *rh);
/**
* Start testing if NAT traversal works using the given configuration
* (IPv4-only). The transport adapters should be down while using
* this function.
*
* @param cfg configuration for the NAT traversal
* @param proto protocol to test, i.e. IPPROTO_TCP or IPPROTO_UDP
* @param bind_ip IPv4 address to bind to
* @param bnd_port port to bind to, 0 to test connection reversal
* @param extern_ip IPv4 address to externally advertise
* @param extern_port externally advertised port to use
* @param report function to call with the result of the test
* @param report_cls closure for @a report
* @return handle to cancel NAT test
*/
struct GNUNET_NAT_Test *
GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
uint8_t proto,
struct in_addr bind_ip,
uint16_t bnd_port,
struct in_addr extern_ip,
uint16_t extern_port,
GNUNET_NAT_TestCallback report,
void *report_cls);
/**
* Stop an active NAT test.
*
* @param tst test to stop.
*/
void
GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
/**
* Handle to auto-configuration in progress.
*/
struct GNUNET_NAT_AutoHandle;
/**
* Converts `enum GNUNET_NAT_StatusCode` to string
*
* @param err error code to resolve to a string
* @return point to a static string containing the error code
*/
const char *
GNUNET_NAT_status2string (enum GNUNET_NAT_StatusCode err);
/**
* Function called with the result from the autoconfiguration.
*
* @param cls closure
* @param diff minimal suggested changes to the original configuration
* to make it work (as best as we can)
* @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
* @param type what the situation of the NAT
*/
typedef void
(*GNUNET_NAT_AutoResultCallback)(void *cls,
const struct GNUNET_CONFIGURATION_Handle *diff,
enum GNUNET_NAT_StatusCode result,
enum GNUNET_NAT_Type type);
/**
* Start auto-configuration routine. The transport adapters should
* be stopped while this function is called.
*
* @param cfg initial configuration
* @param cb function to call with autoconfiguration result
* @param cb_cls closure for @a cb
* @return handle to cancel operation
*/
struct GNUNET_NAT_AutoHandle *
GNUNET_NAT_autoconfig_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
GNUNET_NAT_AutoResultCallback cb,
void *cb_cls);
/**
* Abort autoconfiguration.
*
* @param ah handle for operation to abort
*/
void
GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah);
#endif
/** @} */ /* end of group */
/* end of gnunet_nat_auto_service.h */
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