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108 lines
3.0 KiB
C
108 lines
3.0 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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/*
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* Implementation of the TCP relay server part of Tox.
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*/
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#ifndef C_TOXCORE_TOXCORE_TCP_SERVER_H
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#define C_TOXCORE_TOXCORE_TCP_SERVER_H
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#include "crypto_core.h"
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#include "list.h"
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#include "onion.h"
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#define MAX_INCOMING_CONNECTIONS 256
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#define TCP_MAX_BACKLOG MAX_INCOMING_CONNECTIONS
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#define MAX_PACKET_SIZE 2048
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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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#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 ARRAY_ENTRY_SIZE 6
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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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typedef enum TCP_Status {
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TCP_STATUS_NO_STATUS,
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TCP_STATUS_CONNECTED,
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TCP_STATUS_UNCONFIRMED,
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TCP_STATUS_CONFIRMED,
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} TCP_Status;
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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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typedef struct TCP_Server TCP_Server;
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const uint8_t *tcp_server_public_key(const TCP_Server *tcp_server);
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size_t tcp_server_listen_count(const TCP_Server *tcp_server);
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/* Create new TCP server instance.
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*/
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TCP_Server *new_TCP_server(uint8_t ipv6_enabled, uint16_t num_sockets, const uint16_t *ports, const uint8_t *secret_key,
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Onion *onion);
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/* Run the TCP_server
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*/
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void do_TCP_server(TCP_Server *tcp_server, Mono_Time *mono_time);
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/* Kill the TCP server
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*/
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void kill_TCP_server(TCP_Server *tcp_server);
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/* Read the next two bytes in TCP stream then convert them to
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* length (host byte order).
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*
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* return length on success
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* return 0 if nothing has been read from socket.
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* return -1 on failure.
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*/
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uint16_t read_TCP_length(Socket sock);
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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(Socket sock, uint8_t *data, uint16_t length);
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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(Socket sock, uint16_t *next_packet_length, const uint8_t *shared_key,
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uint8_t *recv_nonce, uint8_t *data, uint16_t max_len);
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#endif
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