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/*
* Handles TCP relay connections between two Tox clients.
*/
/*
* Copyright © 2016-2017 The TokTok team.
* Copyright © 2015 Tox project.
*
* This file is part of Tox, the free peer to peer instant messenger.
*
* 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 TCP_CONNECTION_H
#define TCP_CONNECTION_H
#include "TCP_client.h"
#define TCP_CONN_NONE 0
#define TCP_CONN_VALID 1
/* NOTE: only used by TCP_con */
#define TCP_CONN_CONNECTED 2
/* Connection is not connected but can be quickly reconnected in case it is needed. */
#define TCP_CONN_SLEEPING 3
#define TCP_CONNECTIONS_STATUS_NONE 0
#define TCP_CONNECTIONS_STATUS_REGISTERED 1
#define TCP_CONNECTIONS_STATUS_ONLINE 2
#define MAX_FRIEND_TCP_CONNECTIONS 6
/* Time until connection to friend gets killed (if it doesn't get locked within that time) */
#define TCP_CONNECTION_ANNOUNCE_TIMEOUT (TCP_CONNECTION_TIMEOUT)
/* The amount of recommended connections for each friend
NOTE: Must be at most (MAX_FRIEND_TCP_CONNECTIONS / 2) */
#define RECOMMENDED_FRIEND_TCP_CONNECTIONS (MAX_FRIEND_TCP_CONNECTIONS / 2)
/* Number of TCP connections used for onion purposes. */
#define NUM_ONION_TCP_CONNECTIONS RECOMMENDED_FRIEND_TCP_CONNECTIONS
typedef struct TCP_Conn_to {
uint32_t tcp_connection;
unsigned int status;
unsigned int connection_id;
} TCP_Conn_to;
typedef struct TCP_Connection_to {
uint8_t status;
uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE]; /* The dht public key of the peer */
TCP_Conn_to connections[MAX_FRIEND_TCP_CONNECTIONS];
int id; /* id used in callbacks. */
} TCP_Connection_to;
typedef struct TCP_con {
uint8_t status;
TCP_Client_Connection *connection;
uint64_t connected_time;
uint32_t lock_count;
uint32_t sleep_count;
bool onion;
/* Only used when connection is sleeping. */
IP_Port ip_port;
uint8_t relay_pk[CRYPTO_PUBLIC_KEY_SIZE];
bool unsleep; /* set to 1 to unsleep connection. */
} TCP_con;
typedef struct TCP_Connections TCP_Connections;
const uint8_t *tcp_connections_public_key(const TCP_Connections *tcp_c);
/* Send a packet to the TCP connection.
*
* return -1 on failure.
* return 0 on success.
*/
int send_packet_tcp_connection(TCP_Connections *tcp_c, int connections_number, const uint8_t *packet, uint16_t length);
/* Return a random TCP connection number for use in send_tcp_onion_request.
*
* TODO(irungentoo): This number is just the index of an array that the elements
* can change without warning.
*
* return TCP connection number on success.
* return -1 on failure.
*/
int get_random_tcp_onion_conn_number(TCP_Connections *tcp_c);
/* Send an onion packet via the TCP relay corresponding to tcp_connections_number.
*
* return 0 on success.
* return -1 on failure.
*/
int tcp_send_onion_request(TCP_Connections *tcp_c, unsigned int tcp_connections_number, const uint8_t *data,
uint16_t length);
/* Set if we want TCP_connection to allocate some connection for onion use.
*
* If status is 1, allocate some connections. if status is 0, don't.
*
* return 0 on success.
* return -1 on failure.
*/
int set_tcp_onion_status(TCP_Connections *tcp_c, bool status);
/* Send an oob packet via the TCP relay corresponding to tcp_connections_number.
*
* return 0 on success.
* return -1 on failure.
*/
int tcp_send_oob_packet(TCP_Connections *tcp_c, unsigned int tcp_connections_number, const uint8_t *public_key,
const uint8_t *packet, uint16_t length);
typedef int tcp_data_cb(void *object, int id, const uint8_t *data, uint16_t length, void *userdata);
/* Set the callback for TCP data packets.
*/
void set_packet_tcp_connection_callback(TCP_Connections *tcp_c, tcp_data_cb *tcp_data_callback, void *object);
typedef int tcp_onion_cb(void *object, const uint8_t *data, uint16_t length, void *userdata);
/* Set the callback for TCP onion packets.
*/
void set_onion_packet_tcp_connection_callback(TCP_Connections *tcp_c, tcp_onion_cb *tcp_onion_callback, void *object);
typedef int tcp_oob_cb(void *object, const uint8_t *public_key, unsigned int tcp_connections_number,
const uint8_t *data, uint16_t length, void *userdata);
/* Set the callback for TCP oob data packets.
*/
void set_oob_packet_tcp_connection_callback(TCP_Connections *tcp_c, tcp_oob_cb *tcp_oob_callback, void *object);
/* Create a new TCP connection to public_key.
*
* public_key must be the counterpart to the secret key that the other peer used with new_tcp_connections().
*
* id is the id in the callbacks for that connection.
*
* return connections_number on success.
* return -1 on failure.
*/
int new_tcp_connection_to(TCP_Connections *tcp_c, const uint8_t *public_key, int id);
/* return 0 on success.
* return -1 on failure.
*/
int kill_tcp_connection_to(TCP_Connections *tcp_c, int connections_number);
/* Set connection status.
*
* status of 1 means we are using the connection.
* status of 0 means we are not using it.
*
* Unused tcp connections will be disconnected from but kept in case they are needed.
*
* return 0 on success.
* return -1 on failure.
*/
int set_tcp_connection_to_status(TCP_Connections *tcp_c, int connections_number, bool status);
/* return number of online tcp relays tied to the connection on success.
* return 0 on failure.
*/
unsigned int tcp_connection_to_online_tcp_relays(TCP_Connections *tcp_c, int connections_number);
/* Add a TCP relay tied to a connection.
*
* NOTE: This can only be used during the tcp_oob_callback.
*
* return 0 on success.
* return -1 on failure.
*/
int add_tcp_number_relay_connection(TCP_Connections *tcp_c, int connections_number,
unsigned int tcp_connections_number);
/* Add a TCP relay tied to a connection.
*
* This should be called with the same relay by two peers who want to create a TCP connection with each other.
*
* return 0 on success.
* return -1 on failure.
*/
int add_tcp_relay_connection(TCP_Connections *tcp_c, int connections_number, IP_Port ip_port, const uint8_t *relay_pk);
/* Add a TCP relay to the instance.
*
* return 0 on success.
* return -1 on failure.
*/
int add_tcp_relay_global(TCP_Connections *tcp_c, IP_Port ip_port, const uint8_t *relay_pk);
/* Copy a maximum of max_num TCP relays we are connected to to tcp_relays.
* NOTE that the family of the copied ip ports will be set to TCP_INET or TCP_INET6.
*
* return number of relays copied to tcp_relays on success.
* return 0 on failure.
*/
uint32_t tcp_copy_connected_relays(TCP_Connections *tcp_c, Node_format *tcp_relays, uint16_t max_num);
/* Returns a new TCP_Connections object associated with the secret_key.
*
* In order for others to connect to this instance new_tcp_connection_to() must be called with the
* public_key associated with secret_key.
*
* Returns NULL on failure.
*/
TCP_Connections *new_tcp_connections(const uint8_t *secret_key, TCP_Proxy_Info *proxy_info);
void do_tcp_connections(TCP_Connections *tcp_c, void *userdata);
void kill_tcp_connections(TCP_Connections *tcp_c);
#endif
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