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/* DHT.h
*
* An implementation of the DHT as seen in docs/DHT.txt
*
Copyright (C) 2013 Tox project All Rights Reserved.
This file is part of Tox.
Tox 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 of the License, or
(at your option) any later version.
Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DHT_H
#define DHT_H
#include "network.h"
//Current time, unix format
#define unix_time() ((uint32_t)time(NULL))
//size of the client_id in bytes
#define CLIENT_ID_SIZE 32
//Add a new friend to the friends list
//client_id must be CLIENT_ID_SIZE bytes long.
//returns 0 if success
//returns 1 if failure (friends list is full)
int DHT_addfriend(uint8_t * client_id);
//Delete a friend from the friends list
//client_id must be CLIENT_ID_SIZE bytes long.
//returns 0 if success
//returns 1 if failure (client_id not in friends list)
int DHT_delfriend(uint8_t * client_id);
//Get ip of friend
//client_id must be CLIENT_ID_SIZE bytes long.
//ip must be 4 bytes long.
//port must be 2 bytes long.
//returns ip if success
//returns ip of 0 if failure (This means the friend is either offline or we have not found him yet.)
//returns ip of 1 if friend is not in list.
IP_Port DHT_getfriendip(uint8_t * client_id);
//Run this function at least a couple times per second (It's the main loop)
void doDHT();
//if we receive a DHT packet we call this function so it can be handled.
//Return 0 if packet is handled correctly.
//return 1 if it didn't handle the packet or if the packet was shit.
int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source);
//Use this function to bootstrap the client
//Sends a get nodes request to the given ip port
void DHT_bootstrap(IP_Port ip_port);
//TODO:
//Add functions to save and load the state(client list, friends list)
//Global variables
//Our client id
extern uint8_t self_client_id[CLIENT_ID_SIZE];
#endif
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