/* main.c

   Client TCP/IP minimum

*/
#if defined (WIN32)
#include <winsock2.h>
#elif defined (linux)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define INVALID_SOCKET -1
#define SOCKET_ERROR -1
#define closesocket(s) close (s)
typedef int SOCKET;
typedef struct sockaddr_in SOCKADDR_IN;
typedef struct sockaddr SOCKADDR;
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define PORT 23
#define IP "127.0.0.1"

void client (void)
{
   SOCKET sock= socket (AF_INET, SOCK_STREAM, 0);
   if (sock != INVALID_SOCKET)
   {
      int err;
      SOCKADDR_IN sin = {0};
      sin.sin_addr.s_addr = inet_addr (IP);
      sin.sin_family = AF_INET;
      sin.sin_port = htons (PORT);
      err = connect (sock, (SOCKADDR *) & sin, sizeof (sin));
      if (err != SOCKET_ERROR)
      {
         char *buffer = "Hello world !\n";
         err = send (sock, buffer, strlen (buffer), 0);
         if (err != SOCKET_ERROR)
         {
            printf ("%d bytes%s sent\n", (int) err, err > 1 ? "s" : "");
         }
         else
         {
            printf ("ERR: send()\n");
         }
      }
      else
      {
         printf ("ERR: connect()\n");
      }
      closesocket (sock);
   }
   else
   {
      printf ("ERR: socket()\n");
   }

}

int main (void)
{
#if defined (WIN32)
   WSADATA WSAData;
   int erreur = WSAStartup (MAKEWORD (2, 0), &WSAData);
#else
   int erreur = 0;
#endif
   client ();
#if defined (WIN32)
   WSACleanup ();
#endif
   system ("pause");

   return 0;
}