mirror of
https://github.com/irungentoo/toxcore.git
synced 2024-03-22 13:30:51 +08:00
133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
/* DHT.h
|
|
*
|
|
* An implementation of the DHT as seen in http://wiki.tox.im/index.php/DHT
|
|
*
|
|
* 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 "net_crypto.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/* size of the client_id in bytes */
|
|
#define CLIENT_ID_SIZE crypto_box_PUBLICKEYBYTES
|
|
|
|
typedef struct {
|
|
uint8_t client_id[CLIENT_ID_SIZE];
|
|
IP_Port ip_port;
|
|
uint64_t timestamp;
|
|
uint64_t last_pinged;
|
|
|
|
/* Returned by this node. Either our friend or us */
|
|
IP_Port ret_ip_port;
|
|
uint64_t ret_timestamp;
|
|
} Client_data;
|
|
|
|
Client_data *DHT_get_close_list(void);
|
|
|
|
/* 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(void);
|
|
|
|
/* Use this function to bootstrap the client
|
|
Sends a get nodes request to the given node with ip port and public_key */
|
|
void DHT_bootstrap(IP_Port ip_port, uint8_t *public_key);
|
|
|
|
/* Add nodes to the toping list
|
|
all nodes in this list are pinged every TIME_TOPING seconds
|
|
and are then removed from the list.
|
|
if the list is full the nodes farthest from our client_id are replaced
|
|
the purpose of this list is to enable quick integration of new nodes into the
|
|
network while preventing amplification attacks.
|
|
return 0 if node was added
|
|
return -1 if node was not added */
|
|
int add_toping(uint8_t *client_id, IP_Port ip_port);
|
|
|
|
/* ROUTING FUNCTIONS */
|
|
|
|
/* send the given packet to node with client_id
|
|
returns -1 if failure */
|
|
int route_packet(uint8_t *client_id, uint8_t *packet, uint32_t length);
|
|
|
|
/* Send the following packet to everyone who tells us they are connected to friend_id
|
|
returns the number of nodes it sent the packet to */
|
|
int route_tofriend(uint8_t *friend_id, uint8_t *packet, uint32_t length);
|
|
|
|
/* NAT PUNCHING FUNCTIONS */
|
|
|
|
/* Puts all the different ips returned by the nodes for a friend_id into array ip_portlist
|
|
ip_portlist must be at least MAX_FRIEND_CLIENTS big
|
|
returns the number of ips returned
|
|
returns -1 if no such friend*/
|
|
int friend_ips(IP_Port *ip_portlist, uint8_t *friend_id);
|
|
|
|
/* SAVE/LOAD functions */
|
|
|
|
/* get the size of the DHT (for saving) */
|
|
uint32_t DHT_size(void);
|
|
|
|
/* save the DHT in data where data is an array of size DHT_size() */
|
|
void DHT_save(uint8_t *data);
|
|
|
|
/* init DHT */
|
|
void DHT_init(void);
|
|
|
|
/* load the DHT from data of size size;
|
|
return -1 if failure
|
|
return 0 if success */
|
|
int DHT_load(uint8_t *data, uint32_t size);
|
|
|
|
/* returns 0 if we are not connected to the DHT
|
|
returns 1 if we are */
|
|
int DHT_isconnected();
|
|
|
|
void addto_lists(IP_Port ip_port, uint8_t *client_id);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|