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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2014 Tox project.
*/
#ifndef C_TOXCORE_TOXCORE_TCP_COMMON_H
#define C_TOXCORE_TOXCORE_TCP_COMMON_H
#include "attributes.h"
#include "crypto_core.h"
#include "logger.h"
#include "mem.h"
#include "network.h"
typedef struct TCP_Priority_List TCP_Priority_List;
struct TCP_Priority_List {
TCP_Priority_List *next;
uint16_t size;
uint16_t sent;
uint8_t *data;
};
non_null(1) nullable(2)
void wipe_priority_list(const Memory *mem, TCP_Priority_List *p);
#define NUM_RESERVED_PORTS 16
#define NUM_CLIENT_CONNECTIONS (256 - NUM_RESERVED_PORTS)
typedef enum Tcp_Packet {
TCP_PACKET_ROUTING_REQUEST = 0,
TCP_PACKET_ROUTING_RESPONSE = 1,
TCP_PACKET_CONNECTION_NOTIFICATION = 2,
TCP_PACKET_DISCONNECT_NOTIFICATION = 3,
TCP_PACKET_PING = 4,
TCP_PACKET_PONG = 5,
TCP_PACKET_OOB_SEND = 6,
TCP_PACKET_OOB_RECV = 7,
TCP_PACKET_ONION_REQUEST = 8,
TCP_PACKET_ONION_RESPONSE = 9,
TCP_PACKET_FORWARD_REQUEST = 10,
TCP_PACKET_FORWARDING = 11,
} Tcp_Packet;
#define TCP_HANDSHAKE_PLAIN_SIZE (CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE)
#define TCP_SERVER_HANDSHAKE_SIZE (CRYPTO_NONCE_SIZE + TCP_HANDSHAKE_PLAIN_SIZE + CRYPTO_MAC_SIZE)
#define TCP_CLIENT_HANDSHAKE_SIZE (CRYPTO_PUBLIC_KEY_SIZE + TCP_SERVER_HANDSHAKE_SIZE)
#define TCP_MAX_OOB_DATA_LENGTH 1024
/** frequency to ping connected nodes and timeout in seconds */
#define TCP_PING_FREQUENCY 30
#define TCP_PING_TIMEOUT 10
#define MAX_PACKET_SIZE 2048
typedef struct TCP_Connection {
const Memory *mem;
const Random *rng;
const Network *ns;
Socket sock;
IP_Port ip_port; // for debugging.
uint8_t sent_nonce[CRYPTO_NONCE_SIZE]; /* Nonce of sent packets. */
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
uint8_t last_packet[2 + MAX_PACKET_SIZE];
uint16_t last_packet_length;
uint16_t last_packet_sent;
TCP_Priority_List *priority_queue_start;
TCP_Priority_List *priority_queue_end;
} TCP_Connection;
/**
* @retval 0 if pending data was sent completely
* @retval -1 if it wasn't
*/
non_null()
int send_pending_data_nonpriority(const Logger *logger, TCP_Connection *con);
/**
* @retval 0 if pending data was sent completely
* @retval -1 if it wasn't
*/
non_null()
int send_pending_data(const Logger *logger, TCP_Connection *con);
/**
* @retval 1 on success.
* @retval 0 if could not send packet.
* @retval -1 on failure (connection must be killed).
*/
non_null()
int write_packet_tcp_secure_connection(
const Logger *logger, TCP_Connection *con, const uint8_t *data, uint16_t length,
bool priority);
/** @brief Read length bytes from socket.
*
* return length on success
* return -1 on failure/no data in buffer.
*/
non_null()
int read_tcp_packet(
const Logger *logger, const Memory *mem, const Network *ns, Socket sock, uint8_t *data, uint16_t length, const IP_Port *ip_port);
/**
* @return length of received packet on success.
* @retval 0 if could not read any packet.
* @retval -1 on failure (connection must be killed).
*/
non_null()
int read_packet_tcp_secure_connection(
const Logger *logger, const Memory *mem, const Network *ns,
Socket sock, uint16_t *next_packet_length,
const uint8_t *shared_key, uint8_t *recv_nonce, uint8_t *data,
uint16_t max_len, const IP_Port *ip_port);
#endif /* C_TOXCORE_TOXCORE_TCP_COMMON_H */
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