toxcore/LAN_discovery.h


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/* SPDX-License-Identifier: GPL-3.0-or-later
 * Copyright © 2016-2018 The TokTok team.
 * Copyright © 2013 Tox project.
 */

/*
 * LAN discovery implementation.
 */
#ifndef C_TOXCORE_TOXCORE_LAN_DISCOVERY_H
#define C_TOXCORE_TOXCORE_LAN_DISCOVERY_H

#include "DHT.h"

#ifndef DHT_DEFINED
#define DHT_DEFINED
typedef struct DHT DHT;
#endif /* DHT_DEFINED */

#ifndef IP_DEFINED
#define IP_DEFINED
typedef struct IP IP;
#endif /* IP_DEFINED */

/**
 * Interval in seconds between LAN discovery packet sending.
 */
#define LAN_DISCOVERY_INTERVAL         10

uint32_t lan_discovery_interval(void);

/**
 * Send a LAN discovery pcaket to the broadcast address with port port.
 */
int32_t lan_discovery_send(uint16_t port, DHT *dht);

/**
 * Sets up packet handlers.
 */
void lan_discovery_init(DHT *dht);

/**
 * Clear packet handlers.
 */
void lan_discovery_kill(DHT *dht);

/**
 * Is IP a local ip or not.
 */
bool ip_is_local(IP ip);

/**
 * Checks if a given IP isn't routable.
 *
 * @return true if ip is a LAN ip, false if it is not.
 */
bool ip_is_lan(IP ip);

#endif // C_TOXCORE_TOXCORE_LAN_DISCOVERY_H