#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>

int main(int argc, char **argv)
{
    WORD RequiredVersion;
    WSADATA WData;
    SOCKET ss, s;
    struct sockaddr_in addr, incoming;
    int alen;
    long val;

    if (argc<2) {
        printf("podaj numer portu jako parametr\n");
        return 1;
    }

    RequiredVersion = MAKEWORD(2, 0);

    if (WSAStartup(RequiredVersion, &WData) != 0) {
        printf("Blad inicjalizacji WinSock2\n");
        return 1;
    }

    addr.sin_family = AF_INET;
    addr.sin_port = htons(atoi(argv[1]));
    addr.sin_addr.s_addr = INADDR_ANY;

    ss = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    bind(ss,(struct sockaddr*) &addr, sizeof(addr));
    listen(ss, 10);
    alen = sizeof(incoming);
    while((s = accept(ss, (struct sockaddr*) &incoming, &alen)) 
           != INVALID_SOCKET) {
        recv(s, (char*) &val, sizeof(long), 0);
        val = ntohl(val);
        printf("Otrzymano %d od %s:%u\n",
            val, inet_ntoa(incoming.sin_addr), 
            ntohs(incoming.sin_port));
        if (val == 0) break;
        val++;
        val = htonl(val);
        send(s, (char*) &val, sizeof(long), 0);
        closesocket(s);
    }
    closesocket(ss);

    WSACleanup();
    return 0;
}