added test to check whether the DTLS timeout is within a reasonable time.

1 files changed, 296 insertions, 0 deletions

diff --git a/tests/mini-loss-time.c b/tests/mini-loss-time.c
new file mode 100644
index 0000000000..37e1cd8563
--- /dev/null
+++ b/tests/mini-loss-time.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GnuTLS; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#if !defined(_WIN32)
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#endif
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+#include <signal.h>
+
+#include "utils.h"
+
+/* This program simulates packet loss in DTLS datagrams using
+ * the blocking functions. Idea taken from test app of
+ * Sean Buckheister.
+ */
+
+static void print_type(const unsigned char* buf, int size)
+{
+  if (buf[0] == 22 && size >= 13) {
+    if (buf[13] == 1)
+      fprintf(stderr, "Client Hello\n");
+    else if (buf[13] == 2)
+      fprintf(stderr, "Server Hello\n");
+    else if (buf[13] == 12)
+      fprintf(stderr, "Server Key exchange\n");
+    else if (buf[13] == 14)
+      fprintf(stderr, "Server Hello Done\n");
+    else if (buf[13] == 11)
+      fprintf(stderr, "Certificate\n");
+    else if (buf[13] == 16)
+      fprintf(stderr, "Client Key Exchange\n");
+    else if (buf[4] == 1)
+      fprintf(stderr, "Finished\n");
+    else if (buf[13] == 11)
+      fprintf(stderr, "Server Hello Done\n");
+    else
+      fprintf(stderr, "Unknown handshake\n");
+  } else if (buf[0] == 20) {
+    fprintf(stderr, "Change Cipher Spec\n");
+  } else
+    fprintf(stderr, "Unknown\n");
+}
+
+static void
+server_log_func (int level, const char *str)
+{
+  fprintf (stderr, "server|<%d>| %s", level, str);
+}
+
+static void
+client_log_func (int level, const char *str)
+{
+  fprintf (stderr, "client|<%d>| %s", level, str);
+}
+
+/* A very basic TLS client, with anonymous authentication.
+ */
+
+static int counter;
+static int packet_to_lose;
+gnutls_session_t session;
+
+static ssize_t
+push (gnutls_transport_ptr_t tr, const void *data, size_t len)
+{
+int fd = (long int)tr;
+
+  counter++;
+
+  if (packet_to_lose != -1 && packet_to_lose == counter) {
+    if (debug)
+      {
+        fprintf(stderr, "Discarding packet %d: ", counter);
+        print_type(data, len);
+      }
+      
+    packet_to_lose = 1;
+    counter = 0;
+    return len;
+  }
+  return send(fd, data, len, 0);
+}
+
+static void
+client (int fd, int packet)
+{
+  int ret;
+  gnutls_anon_client_credentials_t anoncred;
+  /* Need to enable anonymous KX specifically. */
+
+  gnutls_global_init ();
+
+  if (debug)
+    {
+      gnutls_global_set_log_function (client_log_func);
+      gnutls_global_set_log_level (4711);
+    }
+
+  gnutls_anon_allocate_client_credentials (&anoncred);
+
+  /* Initialize TLS session
+   */
+  gnutls_init (&session, GNUTLS_CLIENT|GNUTLS_DATAGRAM);
+  gnutls_dtls_set_mtu( session, 1500);
+
+  /* Use default priorities */
+  gnutls_priority_set_direct (session, "NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL", NULL);
+
+  /* put the anonymous credentials to the current session
+   */
+  gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
+
+  counter = 0;
+  packet_to_lose = packet;
+
+  gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) fd);
+  gnutls_transport_set_push_function (session, push);
+
+  /* Perform the TLS handshake
+   */
+  do 
+    {
+      ret = gnutls_handshake (session);
+    }
+  while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+  if (ret < 0)
+    {
+      if (ret == GNUTLS_E_TIMEDOUT) return;
+      fail ("client: Handshake failed\n");
+      gnutls_perror (ret);
+      exit(1);
+    }
+  else
+    {
+      if (debug)
+        success ("client: Handshake was completed\n");
+    }
+
+  exit(1);
+}
+
+
+/* These are global */
+gnutls_anon_server_credentials_t anoncred;
+pid_t child;
+
+static gnutls_session_t
+initialize_tls_session (void)
+{
+  gnutls_session_t session;
+
+  gnutls_init (&session, GNUTLS_SERVER|GNUTLS_DATAGRAM);
+  gnutls_dtls_set_mtu( session, 1500);
+
+  /* avoid calling all the priority functions, since the defaults
+   * are adequate.
+   */
+  gnutls_priority_set_direct (session, "NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL", NULL);
+
+  gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
+
+  return session;
+}
+
+static void
+server (int fd, int packet)
+{
+int ret;
+  /* this must be called once in the program
+   */
+  gnutls_global_init ();
+
+  if (debug)
+    {
+      gnutls_global_set_log_function (server_log_func);
+      gnutls_global_set_log_level (4711);
+    }
+
+  gnutls_anon_allocate_server_credentials (&anoncred);
+
+  session = initialize_tls_session ();
+
+  counter = 0;
+  packet_to_lose = packet;
+
+  gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) fd);
+  gnutls_transport_set_push_function (session, push);
+
+  do 
+    {
+      ret = gnutls_handshake (session);
+    }
+  while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+  if (ret < 0)
+    {
+      close (fd);
+      gnutls_deinit (session);
+      return;
+    }
+}
+
+static void start (int server_packet, int client_packet)
+{
+  int fd[2];
+  int ret;
+  
+  if (debug)
+    fprintf(stderr, "\nWill discard %s packet %d\n", 
+      (client_packet!=-1)?"client":"server", (client_packet!=-1)?client_packet:server_packet);
+  
+  ret = socketpair(AF_LOCAL, SOCK_DGRAM, 0, fd);
+  if (ret < 0)
+    {
+      perror("socketpair");
+      exit(1);
+    }
+
+  child = fork ();
+  if (child < 0)
+    {
+      perror ("fork");
+      fail ("fork");
+      exit(1);
+    }
+
+  if (child)
+    {
+      /* parent */
+      server (fd[0], server_packet);
+    }
+  else 
+    {
+      client (fd[1], client_packet);
+      exit(0);
+    }
+}
+
+static void ch_handler(int sig)
+{
+int status;
+  wait(&status);
+  if (WEXITSTATUS(status) != 0)
+    fail("Child died with status %d\n", WEXITSTATUS(status));
+  return;
+}
+
+void
+doit (void)
+{
+time_t tstart, tstop;
+
+  signal(SIGCHLD, ch_handler);
+
+  tstart = time(0);
+  start(2, -1);
+
+  tstop = time(0);
+  
+  tstop = tstop - tstart;
+
+  if (!(tstop < 70 && tstop > 55))
+    fail("Time difference: %u\n", (unsigned)tstop);
+}