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/* TCP_connection.h
*
* Handles TCP relay connections between two Tox clients.
*
* Copyright (C) 2015 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 TCP_CONNECTION_H
#define TCP_CONNECTION_H
#include "TCP_client.h"
#define TCP_CONN_NONE 0
#define TCP_CONN_VALID 1
#define TCP_CONN_CONNECTED 2
#define TCP_CONNECTIONS_STATUS_NONE 0
#define TCP_CONNECTIONS_STATUS_REGISTERED 1
#define TCP_CONNECTIONS_STATUS_ONLINE 2
#define MAX_FRIEND_TCP_CONNECTIONS 4
typedef struct {
uint8_t status;
uint8_t public_key[crypto_box_PUBLICKEYBYTES]; /* The dht public key of the peer */
struct {
uint32_t tcp_connection;
unsigned int status;
unsigned int connection_id;
} connections[MAX_FRIEND_TCP_CONNECTIONS];
int id; /* id used in callbacks. */
} TCP_Connection_to;
typedef struct {
uint8_t status;
TCP_Client_Connection *connection;
uint32_t lock_count;
} TCP_con;
typedef struct {
DHT *dht;
TCP_Connection_to *connections;
uint32_t connections_length; /* Length of connections array. */
TCP_con *tcp_connections;
uint32_t tcp_connections_length; /* Length of tcp_connections array. */
int (*tcp_data_callback)(void *object, int id, const uint8_t *data, uint16_t length);
void *tcp_data_callback_object;
int (*tcp_oob_callback)(void *object, const uint8_t *public_key, unsigned int tcp_connections_number,
const uint8_t *data, uint16_t length);
void *tcp_oob_callback_object;
int (*tcp_onion_callback)(void *object, const uint8_t *data, uint16_t length);
void *tcp_onion_callback_object;
TCP_Proxy_Info proxy_info;
} TCP_Connections;
/* 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: 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_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);
/* 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);
/* Set the callback for TCP data packets.
*/
void set_packet_tcp_connection_callback(TCP_Connections *tcp_c, int (*tcp_data_callback)(void *object, int id,
const uint8_t *data, uint16_t length), void *object);
/* Set the callback for TCP onion packets.
*/
void set_onion_packet_tcp_connection_callback(TCP_Connections *tcp_c, int (*tcp_onion_callback)(void *object,
const uint8_t *data, uint16_t length), void *object);
/* Set the callback for TCP oob data packets.
*/
void set_oob_packet_tcp_connection_callback(TCP_Connections *tcp_c, int (*tcp_oob_callback)(void *object,
const uint8_t *public_key, unsigned int tcp_connections_number, const uint8_t *data, uint16_t length), void *object);
/* Create a new TCP connection to public_key.
*
* 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);
/* 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.
*
* 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.
*/
unsigned int tcp_copy_connected_relays(TCP_Connections *tcp_c, Node_format *tcp_relays, uint16_t max_num);
TCP_Connections *new_tcp_connections(DHT *dht);
void do_tcp_connections(TCP_Connections *tcp_c);
void kill_tcp_connections(TCP_Connections *tcp_c);
#endif
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