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/* 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"
//our UDP socket, a global variable.
static int sock;
//Basic network functions:
//TODO: put them somewhere else than here
//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;
}
#endif
//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;
}
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