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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2013 Tox project.
*/
/*
* Implementation of the client part of docs/Prevent_Tracking.txt (The part that
* uses the onion stuff to connect to the friend)
*/
#ifndef C_TOXCORE_TOXCORE_ONION_CLIENT_H
#define C_TOXCORE_TOXCORE_ONION_CLIENT_H
#include "net_crypto.h"
#include "onion_announce.h"
#include "ping_array.h"
#define MAX_ONION_CLIENTS 8
#define MAX_ONION_CLIENTS_ANNOUNCE 12 // Number of nodes to announce ourselves to.
#define ONION_NODE_PING_INTERVAL 15
#define ONION_NODE_TIMEOUT ONION_NODE_PING_INTERVAL
/* The interval in seconds at which to tell our friends where we are */
#define ONION_DHTPK_SEND_INTERVAL 30
#define DHT_DHTPK_SEND_INTERVAL 20
#define NUMBER_ONION_PATHS 6
/* The timeout the first time the path is added and
then for all the next consecutive times */
#define ONION_PATH_FIRST_TIMEOUT 4
#define ONION_PATH_TIMEOUT 10
#define ONION_PATH_MAX_LIFETIME 1200
#define ONION_PATH_MAX_NO_RESPONSE_USES 4
#define MAX_STORED_PINGED_NODES 9
#define MIN_NODE_PING_TIME 10
#define ONION_NODE_MAX_PINGS 3
#define MAX_PATH_NODES 32
/* If no announce response packets are received within this interval tox will
* be considered offline. We give time for a node to be pinged often enough
* that it times out, which leads to the network being thoroughly tested as it
* is replaced.
*/
#define ONION_OFFLINE_TIMEOUT (ONION_NODE_PING_INTERVAL * (ONION_NODE_MAX_PINGS+2))
/* Onion data packet ids. */
#define ONION_DATA_FRIEND_REQ CRYPTO_PACKET_FRIEND_REQ
#define ONION_DATA_DHTPK CRYPTO_PACKET_DHTPK
typedef struct Onion_Client Onion_Client;
DHT *onion_get_dht(const Onion_Client *onion_c);
Net_Crypto *onion_get_net_crypto(const Onion_Client *onion_c);
/* Add a node to the path_nodes bootstrap array.
*
* return -1 on failure
* return 0 on success
*/
int onion_add_bs_path_node(Onion_Client *onion_c, IP_Port ip_port, const uint8_t *public_key);
/* Put up to max_num nodes in nodes.
*
* return the number of nodes.
*/
uint16_t onion_backup_nodes(const Onion_Client *onion_c, Node_format *nodes, uint16_t max_num);
/* Add a friend who we want to connect to.
*
* return -1 on failure.
* return the friend number on success or if the friend was already added.
*/
int onion_friend_num(const Onion_Client *onion_c, const uint8_t *public_key);
/* Add a friend who we want to connect to.
*
* return -1 on failure.
* return the friend number on success.
*/
int onion_addfriend(Onion_Client *onion_c, const uint8_t *public_key);
/* Delete a friend.
*
* return -1 on failure.
* return the deleted friend number on success.
*/
int onion_delfriend(Onion_Client *onion_c, int friend_num);
/* Set if friend is online or not.
* NOTE: This function is there and should be used so that we don't send useless packets to the friend if he is online.
*
* is_online 1 means friend is online.
* is_online 0 means friend is offline
*
* return -1 on failure.
* return 0 on success.
*/
int onion_set_friend_online(Onion_Client *onion_c, int friend_num, uint8_t is_online);
/* Get the ip of friend friendnum and put it in ip_port
*
* return -1, -- if public_key does NOT refer to a friend
* return 0, -- if public_key refers to a friend and we failed to find the friend (yet)
* return 1, ip if public_key refers to a friend and we found him
*
*/
int onion_getfriendip(const Onion_Client *onion_c, int friend_num, IP_Port *ip_port);
typedef int recv_tcp_relay_cb(void *object, uint32_t number, IP_Port ip_port, const uint8_t *public_key);
/* Set the function for this friend that will be callbacked with object and number
* when that friends gives us one of the TCP relays he is connected to.
*
* object and number will be passed as argument to this function.
*
* return -1 on failure.
* return 0 on success.
*/
int recv_tcp_relay_handler(Onion_Client *onion_c, int friend_num,
recv_tcp_relay_cb *callback, void *object, uint32_t number);
typedef void onion_dht_pk_cb(void *data, int32_t number, const uint8_t *dht_public_key, void *userdata);
/* Set the function for this friend that will be callbacked with object and number
* when that friend gives us his DHT temporary public key.
*
* object and number will be passed as argument to this function.
*
* return -1 on failure.
* return 0 on success.
*/
int onion_dht_pk_callback(Onion_Client *onion_c, int friend_num, onion_dht_pk_cb *function, void *object,
uint32_t number);
/* Set a friends DHT public key.
*
* return -1 on failure.
* return 0 on success.
*/
int onion_set_friend_DHT_pubkey(Onion_Client *onion_c, int friend_num, const uint8_t *dht_key);
/* Copy friends DHT public key into dht_key.
*
* return 0 on failure (no key copied).
* return 1 on success (key copied).
*/
unsigned int onion_getfriend_DHT_pubkey(const Onion_Client *onion_c, int friend_num, uint8_t *dht_key);
#define ONION_DATA_IN_RESPONSE_MIN_SIZE (CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_MAC_SIZE)
#define ONION_CLIENT_MAX_DATA_SIZE (MAX_DATA_REQUEST_SIZE - ONION_DATA_IN_RESPONSE_MIN_SIZE)
/* Send data of length length to friendnum.
* Maximum length of data is ONION_CLIENT_MAX_DATA_SIZE.
* This data will be received by the friend using the Onion_Data_Handlers callbacks.
*
* Even if this function succeeds, the friend might not receive any data.
*
* return the number of packets sent on success
* return -1 on failure.
*/
int send_onion_data(Onion_Client *onion_c, int friend_num, const uint8_t *data, uint16_t length);
typedef int oniondata_handler_cb(void *object, const uint8_t *source_pubkey, const uint8_t *data,
uint16_t len, void *userdata);
/* Function to call when onion data packet with contents beginning with byte is received. */
void oniondata_registerhandler(Onion_Client *onion_c, uint8_t byte, oniondata_handler_cb *cb, void *object);
void do_onion_client(Onion_Client *onion_c);
Onion_Client *new_onion_client(const Logger *logger, Mono_Time *mono_time, Net_Crypto *c);
void kill_onion_client(Onion_Client *onion_c);
/* return 0 if we are not connected to the network.
* return 1 if we are connected with TCP only.
* return 2 if we are also connected with UDP.
*/
unsigned int onion_connection_status(const Onion_Client *onion_c);
#endif
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