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/*
This file is part of GNUnet.
Copyright (C) 2009, 2015, 2016, 2017 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/>.
*/
/**
* Code to figure out what our external IPv4 address(es) might
* be (external IPv4s are what is seen on the rest of the Internet).
*
* This can be implemented using different methods, and we allow
* the main service to be notified about changes to what we believe
* is our external IPv4 address.
*
* Note that this is explicitly only about NATed systems; if one
* of our network interfaces has a global IP address this does
* not count as "external".
*
* @file nat/gnunet-service-nat_externalip.h
* @brief Functions for monitoring external IPv4 addresses
* @author Christian Grothoff
*/
#ifndef GNUNET_SERVICE_NAT_EXTERNALIP_H
#define GNUNET_SERVICE_NAT_EXTERNALIP_H
#include "platform.h"
/**
* We have changed our opinion about being NATed in the first
* place. Adapt our probing.
*
* @param have_nat #GNUNET_YES if we believe we are behind NAT
*/
void
GN_nat_status_changed (int have_nat);
/**
* Function we call when we believe our external IPv4 address changed.
*
* @param cls closure
* @param ip address to add/remove
* @param add_remove #GNUNET_YES to add, #GNUNET_NO to remove
*/
typedef void
(*GN_NotifyExternalIPv4Change)(void *cls,
const struct in_addr *ip,
int add_remove);
/**
* Handle to monitor for external IP changes.
*/
struct GN_ExternalIPMonitor;
/**
* Start monitoring external IPv4 addresses.
*
* @param cb function to call on changes
* @param cb_cls closure for @a cb
* @return handle to cancel
*/
struct GN_ExternalIPMonitor *
GN_external_ipv4_monitor_start (GN_NotifyExternalIPv4Change cb,
void *cb_cls);
/**
* Stop calling monitor.
*
* @param mon monitor to call
*/
void
GN_external_ipv4_monitor_stop (struct GN_ExternalIPMonitor *mon);
#endif
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