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
|
/* network.h
*
* Functions 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/>.
*/
#include "network.h"
//returns current time in milleseconds since the epoch.
uint64_t current_time()
{
uint64_t time;
#ifdef WIN32
//TODO: windows version
#else
struct timeval a;
gettimeofday(&a, NULL);
time = 1000000UL*a.tv_sec + a.tv_usec;
#endif
return time;
}
int random_int()
{
#ifdef WIN32
//TODO replace rand with a more random windows function
return rand();
#else
return random();
#endif
}
//our UDP socket, a global variable.
static int sock;
//Basic network functions:
//Function to send packet(data) of length length to ip_port
int sendpacket(IP_Port ip_port, char * data, uint32_t length)
{
ADDR addr = {AF_INET, ip_port.port, ip_port.ip};
return sendto(sock, data, length, 0, (struct sockaddr *)&addr, sizeof(addr));
}
//Function to recieve data, ip and port of sender is put into ip_port
//the packet data into data
//the packet length into length.
//dump all empty packets.
int recievepacket(IP_Port * ip_port, char * data, uint32_t * length)
{
ADDR addr;
uint32_t addrlen = sizeof(addr);
(*(int *)length) = recvfrom(sock, data, MAX_UDP_PACKET_SIZE, 0, (struct sockaddr *)&addr, &addrlen);
if(*(int *)length <= 0)
{
//nothing recieved
//or empty packet
return -1;
}
ip_port->ip = addr.ip;
ip_port->port = addr.port;
return 0;
}
//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)
//returns 0 if no problems
//TODO: add something to check if there are errors
int init_networking(IP ip ,uint16_t port)
{
#ifdef WIN32
WSADATA wsaData;
if(WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
{
return -1;
}
#else
srandom((uint32_t)current_time());
#endif
srand((uint32_t)current_time());
//initialize our socket
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
//Functions to increase the size of the send and recieve UDP buffers
//NOTE: uncomment if necessary
/*
int n = 1024 * 1024 * 2;
if(setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char*)&n, sizeof(n)) == -1)
{
return -1;
}
if(setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char*)&n, sizeof(n)) == -1)
{
return -1;
}*/
//Set socket nonblocking
#ifdef WIN32
//I think this works for windows
u_long mode = 1;
//ioctl(sock, FIONBIO, &mode);
ioctlsocket(sock, FIONBIO, &mode);
#else
fcntl(sock, F_SETFL, O_NONBLOCK, 1);
#endif
//Bind our socket to port PORT and address 0.0.0.0
ADDR addr = {AF_INET, htons(port), ip};
bind(sock, (struct sockaddr*)&addr, sizeof(addr));
return 0;
}
//function to cleanup networking stuff
void shutdown_networking()
{
#ifdef WIN32
WSACleanup();
#endif
return;
}
|
