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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* network.h
*
* Datatypes, functions and includes for the core networking.
*
* Copyright (C) 2013 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 NETWORK_H
#define NETWORK_H
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#ifdef WIN32 /* Put win32 includes here */
#ifndef WINVER
//Windows XP
#define WINVER 0x0501
#endif
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#undef VANILLA_NACL /* Make sure on Windows we use libsodium. */
#else // Linux includes
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <netdb.h>
#include <unistd.h>
#endif
#ifndef VANILLA_NACL
/* We use libsodium by default. */
#include <sodium.h>
#else
#include <crypto_box.h>
#define crypto_box_MACBYTES (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES)
#endif
#define MAX_UDP_PACKET_SIZE 65507
#define NET_PACKET_PING_REQUEST 0 /* Ping request packet ID. */
#define NET_PACKET_PING_RESPONSE 1 /* Ping response packet ID. */
#define NET_PACKET_GET_NODES 2 /* Get nodes request packet ID. */
#define NET_PACKET_SEND_NODES 3 /* Send nodes response packet ID. */
#define NET_PACKET_HANDSHAKE 16 /* Handshake packet ID. */
#define NET_PACKET_SYNC 17 /* SYNC packet ID. */
#define NET_PACKET_DATA 18 /* Data packet ID. */
#define NET_PACKET_CRYPTO 32 /* Encrypted data packet ID. */
#define NET_PACKET_LAN_DISCOVERY 33 /* LAN discovery packet ID. */
/* Current time, unix format */
#define unix_time() ((uint64_t)time(NULL))
typedef union {
uint8_t uint8[4];
uint16_t uint16[2];
uint32_t uint32;
} IP;
typedef union {
struct {
IP ip;
uint16_t port;
/* Not used for anything right now. */
uint16_t padding;
};
uint8_t uint8[8];
} IP_Port;
typedef struct {
int16_t family;
uint16_t port;
IP ip;
uint8_t zeroes[8];
#ifdef ENABLE_IPV6
uint8_t zeroes2[12];
#endif
} ADDR;
/* Function to receive data, ip and port of sender is put into ip_port.
* Packet data is put into data.
* Packet length is put into length.
*/
typedef int (*packet_handler_callback)(void *object, IP_Port ip_port, uint8_t *data, uint32_t len);
typedef struct {
packet_handler_callback function;
void *object;
} Packet_Handles;
typedef struct {
Packet_Handles packethandlers[256];
/* Our UDP socket. */
#ifdef WIN32
unsigned int sock;
#else
int sock;
#endif
} Networking_Core;
/* return current time in milleseconds since the epoch. */
uint64_t current_time(void);
/* return a random number.
* NOTE: this function should probably not be used where cryptographic randomness is absolutely necessary.
*/
uint32_t random_int(void);
/* Basic network functions: */
/* Function to send packet(data) of length length to ip_port. */
#ifdef WIN32
int sendpacket(unsigned int sock, IP_Port ip_port, uint8_t *data, uint32_t length);
#else
int sendpacket(int sock, IP_Port ip_port, uint8_t *data, uint32_t length);
#endif
/* Function to call when packet beginning with byte is received. */
void networking_registerhandler(Networking_Core *net, uint8_t byte, packet_handler_callback cb, void *object);
/* Call this several times a second. */
void networking_poll(Networking_Core *net);
/* Initialize networking.
* bind to ip and port.
* ip must be in network order EX: 127.0.0.1 = (7F000001).
* port is in host byte order (this means don't worry about it).
*
* return 0 if no problems.
* return -1 if there were problems.
*/
Networking_Core *new_networking(IP ip, uint16_t port);
/* Function to cleanup networking stuff (doesn't do much right now). */
void kill_networking(Networking_Core *net);
#endif
|
