#include <iostream>
#include <Winsock2.h>
#include <stdio.h>

using namespace std;

DWORD printError(int numError) {
    char errorMessage[1000];
    DWORD fm = FormatMessage(
            FORMAT_MESSAGE_FROM_SYSTEM,
            NULL,
            (DWORD) numError,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPSTR) errorMessage,
            sizeof(errorMessage),
            NULL);
    printf("error: %s\n", errorMessage);
    return fm;
}

int main(int argc, char** argv) {

    setlocale(LC_ALL, "Russian");

    if (argc < 2) {
        cout << "error: too few args" << endl;
        return EXIT_FAILURE;
    }

    //init socket
    WSADATA ws;
    if (WSAStartup(MAKEWORD(2, 0), &ws)) {
        printError(WSAGetLastError());
        return EXIT_FAILURE;
    }

    struct hostent* hent;
    unsigned long ip_address;

    //trying to parse IP
    if ((ip_address = inet_addr(argv[1])) != INADDR_NONE) {
        struct in_addr ips;
        ips.s_addr = ip_address;

        //on success try to get host by address
        if (!(hent = gethostbyaddr((char*)&ips, 4, AF_INET))) {
            printError(WSAGetLastError());
            return EXIT_FAILURE;
        }
    }
    else {
        //on fail try to get host by name
        if (!(hent = gethostbyname(argv[1]))) {
            printError(WSAGetLastError());
            return EXIT_FAILURE;
        }
    }

    if (WSACleanup()) {
        printError(WSAGetLastError());
        return EXIT_FAILURE;
    }

    cout << "name:\t" << hent->h_name << endl;
    cout << "h_alias:\n";
    for (char** pAlias = hent->h_aliases; *pAlias != NULL; ++pAlias) {
        cout << '\t' << *pAlias << '\n';
    }

    cout << "h_addresses:\n";
    for (char** pAddress = hent->h_addr_list; *pAddress != NULL; ++pAddress) {
        cout << '\t' << inet_ntoa(*(in_addr*)*pAddress) << '\n';
    }

    return EXIT_SUCCESS;
}