// Test internet connection using a root dns server ... shame ? :)
#define RAYDIUM_NETWORK_INTERNET_TEST_HOST	"198.41.0.4"
#define RAYDIUM_NETWORK_INTERNET_TEST_PORT	53

signed char raydium_network_internet_test(void)
{
int sockfd;
struct sockaddr_in serv_addr;
struct hostent *server;
struct timeval sv;
int svlen;
struct timeval timeout;
fd_set writable;

sockfd = socket(AF_INET, SOCK_STREAM, 0);
server = gethostbyname(RAYDIUM_NETWORK_INTERNET_TEST_HOST);
//server = gethostbyname("192.168.2.1");

memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;

memcpy(&(serv_addr.sin_addr.s_addr),server->h_addr,server->h_length);
serv_addr.sin_port = htons(RAYDIUM_NETWORK_INTERNET_TEST_PORT);

raydium_network_set_socket_block_internal(sockfd,0);

// i'm tired of win32's sockets bad behaviours ... let's trust connect() ...
connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));

FD_ZERO(&writable);
FD_SET(sockfd, &writable);
timeout.tv_sec=3;
timeout.tv_usec=0;

if (select(sockfd + 1, NULL, &writable, NULL, &timeout) == 0)
    {
    raydium_log("network: cannot contact remote server, no internet connection detected");
    close(sockfd);
    return 0; // not writable
    }
    
close(sockfd);
return 1; // writable
}