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/* Program server */
#ifdef __cplusplus
#error Be sure you are using a C compiler...
#endif
#if defined (WIN32) || defined (_WIN32)
#include <winsock2.h>
#elif defined (linux) || defined (_POSIX_VERSION) || defined (_POSIX2_C_VERSION)\
|| defined (_XOPEN_VERSION)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h> /* close */
#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;
#else
#error not defined for this platform
#endif
#include <stdio.h>
#include <stdlib.h>
/* macros ============================================================== */
/* constants =========================================================== */
/* constante */
#define port 23
/* types =============================================================== */
/* structures ========================================================== */
/* private data ======================================================== */
/* private functions =================================================== */
static int traiter_client (int sock_cli)
{
int err = 0;
char buf[1024];
int n = recv (sock_cli, buf, sizeof (buf) - 1, 0);
if (n > 0)
{
/* process the received data */
buf[n] = '\0';
printf ("Received %d chars:'%s' on socket %d\n", n, buf, sock_cli);
}
else
{
if (n == 0)
{
printf ("deconnexion socket %d\n", sock_cli);
}
else
{
printf ("receive error on socket %d\n", sock_cli);
}
err = 1;
}
return err;
}
static int get_cli_ndx (SOCKET a[], int n)
{
int ndx = -1;
int i;
for (i = 0; i < n; i++)
{
if (a[i] == INVALID_SOCKET)
{
ndx = i;
break;
}
}
return ndx;
}
static int server (void)
{
/* creation socket */
SOCKET sock_srv = socket (PF_INET, SOCK_STREAM, 0);
if (sock_srv == INVALID_SOCKET)
{
perror ("call to socket\n");
exit (EXIT_FAILURE);
}
printf ("socket ok\n");
/*initialization */
struct sockaddr_in sin = { 0 };
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons (port);
/*BIND*/ if (bind (sock_srv, (struct sockaddr *) &sin, sizeof (sin)) < 0)
{
perror ("call to bind\n");
exit (-1);
}
printf ("bind ok\n");
/* setsockopt */
int bOptVal = 1;
int bOptLen = sizeof (int);
if (setsockopt
(sock_srv, SOL_SOCKET, SO_REUSEADDR, (char *) &bOptVal,
bOptLen) != SO_ERROR)
{
printf ("Set reuseaddr: ON\n");
}
/* LISTEN */
if (listen (sock_srv, 5) < 0)
{
perror ("call to listen\n");
exit (EXIT_FAILURE);
}
printf ("waiting for connections...\n");
SOCKET a_cli[] = { INVALID_SOCKET, INVALID_SOCKET, INVALID_SOCKET };
#define NB_CLI (sizeof a_cli/sizeof *a_cli)
while (1)
{
fd_set inputs;
/* compute the 1st parameter of select (ignored with Windows) */
SOCKET sock_last = sock_srv;
FD_ZERO (&inputs); /*réinitialisation list of client */
FD_SET (sock_srv, &inputs); /*set with the server socket (accept) */
/* set clients (recv) */
{
size_t i;
for (i = 0; i < NB_CLI; i++)
{
SOCKET sock_cli = a_cli[i];
if (sock_cli != INVALID_SOCKET)
{
FD_SET (sock_cli, &inputs);
if (sock_last < sock_cli)
{
sock_last = sock_cli;
}
}
}
}
sock_last++;
/*select on the client list */
if ((select (sock_last, &inputs, NULL, NULL, NULL)) < 0)
{
perror ("select error\n");
}
printf ("select()\n");
if (FD_ISSET (sock_srv, &inputs))
{
/* accept the connection */
struct sockaddr_in pin;
int address_size;
SOCKET sock_cli =
accept (sock_srv, (struct sockaddr *) &pin, &address_size);
if (sock_cli == INVALID_SOCKET)
{
perror ("call to accept\n");
exit (EXIT_FAILURE);
}
printf ("A client is connected with socket %d\n", sock_cli);
FD_SET (sock_cli, &inputs);
{
int i = get_cli_ndx (a_cli, NB_CLI);
if (i != -1)
{
a_cli[i] = sock_cli;
}
else
{
closesocket (sock_cli);
}
}
}
/* check clients */
{
size_t i;
for (i = 0; i < NB_CLI; i++)
{
SOCKET sock_cli = a_cli[i];
if (sock_cli != INVALID_SOCKET)
{
if (FD_ISSET (sock_cli, &inputs))
{
int err = traiter_client (sock_cli);
if (err)
{
closesocket (sock_cli);
a_cli[i] = INVALID_SOCKET;
}
}
}
}
}
}
/* close clients */
{
size_t i;
for (i = 0; i < NB_CLI; i++)
{
SOCKET sock_cli = a_cli[i];
if (sock_cli != INVALID_SOCKET)
{
closesocket (sock_cli);
a_cli[i] = INVALID_SOCKET;
}
}
}
/* close server */
closesocket (sock_srv);
return 0;
}
/* entry point ========================================================= */
/* ---------------------------------------------------------------------
--------------------------------------------------------------------- */
int main (void)
{
int ret;
#if defined (WIN32) || defined (_WIN32)
WSADATA wsa_data;
int err = WSAStartup (MAKEWORD (2, 2), &wsa_data);
if (!err)
{
puts ("WIN: winsock2: OK");
#else
int err;
#endif
server ();
#if defined (WIN32) || defined (_WIN32)
WSACleanup ();
}
#endif
if (err)
{
ret = EXIT_FAILURE;
}
else
{
ret = EXIT_SUCCESS;
}
return ret;
} |