PSI ukol 1

// UDP_Communication_Framework.cpp : Defines the entry point for the console application.
//

#pragma comment(lib, "ws2_32.lib")
#include "stdafx.h"
#include <winsock2.h>
#include "ws2tcpip.h"

#define TARGET_IP	"147.32.221.14"

#define BUFFERS_LEN 1024

#define SENDER
//#define RECEIVER

#ifdef SENDER
#define TARGET_PORT 5555
#define LOCAL_PORT 8888
#endif // SENDER

#ifdef RECEIVER
#define TARGET_PORT 8888
#define LOCAL_PORT 5555
#endif // RECEIVER


void InitWinsock()
{
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
}

//**********************************************************************
int main()
{
	SOCKET socketS;

	InitWinsock();

	struct sockaddr_in local;
	struct sockaddr_in from;

	int fromlen = sizeof(from);
	local.sin_family = AF_INET;
	local.sin_port = htons(LOCAL_PORT);
	local.sin_addr.s_addr = INADDR_ANY;


	socketS = socket(AF_INET, SOCK_DGRAM, 0);
	if (bind(socketS, (sockaddr*)&local, sizeof(local)) != 0) {
		printf("Binding error!\n");
		getchar(); //wait for press Enter
		return 1;
	}
	//**********************************************************************
	char buffer_rx[BUFFERS_LEN];
	char buffer_tx[BUFFERS_LEN];

#ifdef SENDER

	sockaddr_in addrDest;
	addrDest.sin_family = AF_INET;
	addrDest.sin_port = htons(TARGET_PORT);
	InetPton(AF_INET, _T(TARGET_IP), &addrDest.sin_addr.s_addr);


	strncpy(buffer_tx, "Hello world payload!\n", BUFFERS_LEN); //put some data to buffer
	printf("Sending packet.\n");
	sendto(socketS, buffer_tx, strlen(buffer_tx), 0, (sockaddr*)&addrDest, sizeof(addrDest));

	closesocket(socketS);

#endif // SENDER

#ifdef RECEIVER

	strncpy(buffer_rx, "No data received.\n", BUFFERS_LEN);
	printf("Waiting for datagram ...\n");
	if (recvfrom(socketS, buffer_rx, sizeof(buffer_rx), 0, (sockaddr*)&from, &fromlen) == SOCKET_ERROR) {
		printf("Socket error!\n");
		getchar();
		return 1;
	}
	else
		printf("Datagram: %s", buffer_rx);

	closesocket(socketS);
#endif
	//**********************************************************************

	getchar(); //wait for press Enter
	return 0;
}