1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2014 Tox project.
*/
/*
* Implementation of the TCP relay server part of Tox.
*/
#ifndef C_TOXCORE_TOXCORE_TCP_SERVER_H
#define C_TOXCORE_TOXCORE_TCP_SERVER_H
#include "crypto_core.h"
#include "list.h"
#include "onion.h"
#define MAX_INCOMING_CONNECTIONS 256
#define TCP_MAX_BACKLOG MAX_INCOMING_CONNECTIONS
#define MAX_PACKET_SIZE 2048
#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
#define NUM_RESERVED_PORTS 16
#define NUM_CLIENT_CONNECTIONS (256 - NUM_RESERVED_PORTS)
#define TCP_PACKET_ROUTING_REQUEST 0
#define TCP_PACKET_ROUTING_RESPONSE 1
#define TCP_PACKET_CONNECTION_NOTIFICATION 2
#define TCP_PACKET_DISCONNECT_NOTIFICATION 3
#define TCP_PACKET_PING 4
#define TCP_PACKET_PONG 5
#define TCP_PACKET_OOB_SEND 6
#define TCP_PACKET_OOB_RECV 7
#define TCP_PACKET_ONION_REQUEST 8
#define TCP_PACKET_ONION_RESPONSE 9
#define ARRAY_ENTRY_SIZE 6
/* frequency to ping connected nodes and timeout in seconds */
#define TCP_PING_FREQUENCY 30
#define TCP_PING_TIMEOUT 10
typedef enum TCP_Status {
TCP_STATUS_NO_STATUS,
TCP_STATUS_CONNECTED,
TCP_STATUS_UNCONFIRMED,
TCP_STATUS_CONFIRMED,
} TCP_Status;
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[];
};
void wipe_priority_list(TCP_Priority_List *p);
typedef struct TCP_Server TCP_Server;
const uint8_t *tcp_server_public_key(const TCP_Server *tcp_server);
size_t tcp_server_listen_count(const TCP_Server *tcp_server);
/* Create new TCP server instance.
*/
TCP_Server *new_TCP_server(uint8_t ipv6_enabled, uint16_t num_sockets, const uint16_t *ports, const uint8_t *secret_key,
Onion *onion);
/* Run the TCP_server
*/
void do_TCP_server(TCP_Server *tcp_server, Mono_Time *mono_time);
/* Kill the TCP server
*/
void kill_TCP_server(TCP_Server *tcp_server);
/* Read the next two bytes in TCP stream then convert them to
* length (host byte order).
*
* return length on success
* return 0 if nothing has been read from socket.
* return -1 on failure.
*/
uint16_t read_TCP_length(Socket sock);
/* Read length bytes from socket.
*
* return length on success
* return -1 on failure/no data in buffer.
*/
int read_TCP_packet(Socket sock, uint8_t *data, uint16_t length);
/* return length of received packet on success.
* return 0 if could not read any packet.
* return -1 on failure (connection must be killed).
*/
int read_packet_TCP_secure_connection(Socket sock, uint16_t *next_packet_length, const uint8_t *shared_key,
uint8_t *recv_nonce, uint8_t *data, uint16_t max_len);
#endif
|
