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#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);
//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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