doc/examples/ex-alert.c

   1 /* This example code is placed in the public domain. */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include <config.h>
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <gnutls/gnutls.h>
  10
  11 #include "examples.h"
  12
  13 /* This function will check whether the given return code from
  14  * a gnutls function (recv/send), is an alert, and will print
  15  * that alert.
  16  */
  17 void
  18 check_alert (gnutls_session_t session, int ret)
  19 {
  20   int last_alert;
  21
  22   if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED
  23       || ret == GNUTLS_E_FATAL_ALERT_RECEIVED)
  24     {
  25       last_alert = gnutls_alert_get (session);
  26
  27       /* The check for renegotiation is only useful if we are
  28        * a server, and we had requested a rehandshake.
  29        */
  30       if (last_alert == GNUTLS_A_NO_RENEGOTIATION &&
  31           ret == GNUTLS_E_WARNING_ALERT_RECEIVED)
  32         printf ("* Received NO_RENEGOTIATION alert. "
  33                 "Client Does not support renegotiation.\n");
  34       else
  35         printf ("* Received alert '%d': %s.\n", last_alert,
  36                 gnutls_alert_get_name (last_alert));
  37     }
  38 }