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