mini-loss2 is more robust.

4 files changed, 336 insertions, 642 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index e1b6cf63e9..99532d3ca2 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -66,7 +66,7 @@ ctests = mini-deflate simple gc set_pkcs12_cred certder certuniqueid	\
 	 crq_apis init_roundtrip pkcs12_s2k_pem dn2 mini-eagain		\
 	 nul-in-x509-names x509_altname pkcs12_encode mini-x509		\
 	 mini-x509-rehandshake rng-fork mini-eagain-dtls mini-loss	\
-	 x509cert x509cert-tl infoaccess rsa-encrypt-decrypt mini-loss2
+	 x509cert x509cert-tl infoaccess rsa-encrypt-decrypt
 
 if ENABLE_OCSP
 ctests += ocsp
diff --git a/tests/loss-common.h b/tests/loss-common.h
deleted file mode 100644
index 28432736cc..0000000000
--- a/tests/loss-common.h
+++ /dev/null
@@ -1,215 +0,0 @@
-#define min(x,y) ((x)<(y)?(x):(y))
-
-char tmpbuf[128];
-extern const char* prefix;
-
-#define HANDSHAKE_EXPECT(c, s, clierr, serverr) \
-  sret = cret = GNUTLS_E_AGAIN; \
-  do \
-    { \
-      if (cret == GNUTLS_E_AGAIN) \
-        { \
-          prefix = "client"; \
-          cret = gnutls_handshake (c); \
-        } \
-      else if (cret >= 0) \
-        { \
-          prefix = "client"; \
-          ret = gnutls_record_recv(c, tmpbuf, sizeof(tmpbuf)); \
-        } \
-      if (sret == GNUTLS_E_AGAIN) \
-        { \
-          prefix = "server"; \
-          sret = gnutls_handshake (s); \
-        } \
-      else if (sret >= 0) \
-        { \
-          prefix = "server"; \
-          ret = gnutls_record_recv(s, tmpbuf, sizeof(tmpbuf)); \
-        } \
-    } \
-  while ((cret == GNUTLS_E_AGAIN || (cret == 0 && sret == GNUTLS_E_AGAIN)) && (sret == GNUTLS_E_AGAIN || (sret == 0 && cret == GNUTLS_E_AGAIN))); \
-  if (cret != clierr || sret != serverr) \
-    { \
-      fprintf(stderr, "client: %s\n", gnutls_strerror(cret)); \
-      fprintf(stderr, "server: %s\n", gnutls_strerror(sret)); \
-      fail("Handshake failed\n"); \
-      exit(1); \
-    }
-
-#define HANDSHAKE(c, s) \
-  HANDSHAKE_EXPECT(c,s,0,0)
-
-#define TRANSFER(c, s, msg, msglen, buf, buflen) \
-  sret = cret = GNUTLS_E_AGAIN; \
-  do \
-    { \
-      if (cret == GNUTLS_E_AGAIN) \
-        { \
-          prefix = "client"; \
-          cret = gnutls_record_send (c, msg, msglen); \
-        } \
-      if (sret == GNUTLS_E_AGAIN) \
-        { \
-          prefix = "server"; \
-          sret = gnutls_record_recv (s, buf, buflen); \
-        } \
-    } \
-  while ((cret == GNUTLS_E_AGAIN || (cret >= 0 && sret == GNUTLS_E_AGAIN)) && (sret == GNUTLS_E_AGAIN || (sret >= 0 && cret == GNUTLS_E_AGAIN))); \
-  \
-  if (cret < 0) fail ("client send error: %s\n", gnutls_strerror (ret)); \
-  if (sret < 0) fail ("server send error: %s\n", gnutls_strerror (ret))
-
-static char to_server[64*1024];
-static size_t to_server_len = 0;
-
-static char to_client[64*1024];
-static size_t to_client_len = 0;
-
-extern int counter;
-extern int packet_to_lose;
-
-#ifdef LOSS_DEBUG
-# define RETURN_RND_LOSS(session, len) { \
-  if (counter++ == packet_to_lose) \
-    { \
-    int t = gnutls_handshake_get_last_out(session); \
-    fprintf(stderr, "Discarding packet (%d) with seq %d\n", \
-        t, counter); \
-      return len; \
-    } \
-  }
-#else
-# define RETURN_RND_LOSS(session, len) { \
-  if (counter++ == packet_to_lose) \
-    { \
-      return len; \
-    } \
-  }
-#endif
-
-static void reset_counters(void)
-{
-  to_client_len = to_server_len = 0;
-}
-
-static ssize_t
-client_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
-{
-  size_t newlen;
-
-  len = min(len, sizeof(to_server)-to_server_len);
-//  RETURN_RND_LOSS(tr, len);
-
-  newlen = to_server_len + len;
-  memcpy (to_server + to_server_len, data, len);
-  to_server_len = newlen;
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: pushed %d bytes to server (avail: %d)\n", (int)len, (int)to_server_len);
-#endif
-  return len;
-}
-
-static ssize_t
-client_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
-{
-  if (to_client_len == 0)
-    {
-#ifdef LOSS_DEBUG2
-      fprintf(stderr, "loss: Not enough data by server (asked for: %d, have: %d)\n", (int)len, (int)to_client_len);
-#endif
-      return -1;
-    }
-
-  len = min(len, to_client_len);
-
-  memcpy (data, to_client, len);
-  memmove (to_client, to_client + len, to_client_len - len);
-  to_client_len -= len;
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: pulled %d bytes by client (avail: %d)\n", (int)len, (int)to_client_len);
-#endif
-  return len;
-}
-
-static ssize_t
-server_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
-{
-  if (to_server_len == 0)
-    {
-#ifdef LOSS_DEBUG2
-      fprintf(stderr, "loss: Not enough data by client (asked for: %d, have: %d)\n", (int)len, (int)to_server_len);
-#endif
-      return -1;
-    }
-
-  len = min(len, to_server_len);
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: pulled %d bytes by server (avail: %d)\n", (int)len, (int)to_server_len);
-#endif
-  memcpy (data, to_server, len);
-
-  memmove (to_server, to_server + len, to_server_len - len);
-  to_server_len -= len;
-
-  return len;
-}
-
-static ssize_t
-server_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
-{
-  size_t newlen;
-
-//  hexprint (data, len);
-
-  len = min(len, sizeof(to_client)-to_client_len);
-  RETURN_RND_LOSS(tr, len);
-
-  newlen = to_client_len + len;
-  memcpy (to_client + to_client_len, data, len);
-  to_client_len = newlen;
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: pushed %d bytes to client (avail: %d)\n", (int)len, (int)to_client_len);
-#endif
-
-  return len;
-}
-
-/* inline is used to avoid a gcc warning if used in mini-loss */
-inline static int server_pull_timeout_func(gnutls_transport_ptr_t ptr, unsigned int ms)
-{
-int ret;
-
-  if (to_server_len > 0)
-    ret = 1; /* available data */
-  else
-    ret = 0; /* timeout */
-
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: server_pull_timeout: %d\n", ret);
-#endif
-
-  return ret;
-}
-
-inline static int client_pull_timeout_func(gnutls_transport_ptr_t ptr, unsigned int ms)
-{
-int ret;
-
-  if (to_client_len > 0)
-    ret = 1;
-  else
-    ret = 0;
-
-#ifdef LOSS_DEBUG
-  fprintf(stderr, "loss: client_pull_timeout: %d\n", ret);
-#endif
-
-  return ret;
-}
-
-inline static void reset_buffers(void)
-{
-  to_server_len = 0;
-  to_client_len = 0;
-}
diff --git a/tests/mini-loss.c b/tests/mini-loss.c
index 21e013224b..78a91f531a 100644
--- a/tests/mini-loss.c
+++ b/tests/mini-loss.c
@@ -1,7 +1,7 @@
 /*
- * Copyright (C) 2008-2012 Free Software Foundation, Inc.
+ * Copyright (C) 2012 Free Software Foundation, Inc.
  *
- * Author: Simon Josefsson, Nikos Mavrogiannopoulos
+ * Author: Nikos Mavrogiannopoulos
  *
  * This file is part of GnuTLS.
  *
@@ -27,94 +27,368 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <errno.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/crypto.h>
+#include <gnutls/dtls.h>
+
 #include "utils.h"
-#include "loss-common.h"
 
-const char * prefix = NULL;
-int counter;
-int packet_to_lose;
+/* This program simulates packet loss in DTLS datagrams using
+ * the blocking functions
+ */
+
+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
-tls_log_func (int level, const char *str)
+server_log_func (int level, const char *str)
 {
-  fprintf (stderr, "%s|<%d>| %s", prefix, level, str);
+  fprintf (stderr, "server|<%d>| %s", level, str);
 }
 
-static gnutls_anon_server_credentials_t s_anoncred;
-static gnutls_anon_client_credentials_t c_anoncred;
+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.
+ */
+
+#define MAX_BUF 1024
+#define MSG "Hello TLS"
+
+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);
+      }
+    return len;
+  }
+  return send(fd, data, len, 0);
+}
 
-static void try1 (int packet)
+static void
+client (int fd, int packet)
 {
-  /* Server stuff. */
-  gnutls_session_t server;
-  int sret, cret;
-  /* Client stuff. */
-  gnutls_session_t client;
+  int ret, ii;
+  char buffer[MAX_BUF + 1];
+  gnutls_anon_client_credentials_t anoncred;
   /* Need to enable anonymous KX specifically. */
-  int ret;
+
+  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;
-  reset_counters();
-  
-  gnutls_init (&server, GNUTLS_SERVER|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK);
-  ret = gnutls_priority_set_direct (server, "NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL", NULL);
+
+  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)
-    exit(1);
-  gnutls_credentials_set (server, GNUTLS_CRD_ANON, s_anoncred);
-  gnutls_transport_set_push_function (server, server_push);
-  gnutls_transport_set_pull_function (server, server_pull);
-  gnutls_transport_set_pull_timeout_function (server, server_pull_timeout_func);
-  gnutls_transport_set_ptr (server, (gnutls_transport_ptr_t)server);
-
-  /* Init client */
-  gnutls_init (&client, GNUTLS_CLIENT|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK);
-  cret = gnutls_priority_set_direct (client, "NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL", NULL);
-  if (cret < 0)
-    exit(1);
-  gnutls_credentials_set (client, GNUTLS_CRD_ANON, c_anoncred);
-  gnutls_transport_set_push_function (client, client_push);
-  gnutls_transport_set_pull_function (client, client_pull);
-  gnutls_transport_set_pull_timeout_function (client, client_pull_timeout_func);
-  gnutls_transport_set_ptr (client, (gnutls_transport_ptr_t)client);
-
-  HANDSHAKE(client, server);
+    {
+      fail ("client: Handshake failed\n");
+      gnutls_perror (ret);
+      exit(1);
+    }
+  else
+    {
+      if (debug)
+        success ("client: Handshake was completed\n");
+    }
 
   if (debug)
-    success ("Handshake established\n");
+    success ("client: TLS version is: %s\n",
+             gnutls_protocol_get_name (gnutls_protocol_get_version
+                                       (session)));
 
-  gnutls_bye (client, GNUTLS_SHUT_WR);
-  gnutls_bye (server, GNUTLS_SHUT_WR);
+  do {
+    ret = gnutls_record_send (session, MSG, strlen (MSG));
+  } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
 
-  gnutls_deinit (client);
-  gnutls_deinit (server);
+  do {
+    ret = gnutls_record_recv (session, buffer, MAX_BUF);
+  } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+  if (ret == 0)
+    {
+      if (debug)
+        success ("client: Peer has closed the TLS connection\n");
+      goto end;
+    }
+  else if (ret < 0)
+    {
+      fail ("client: Error: %s\n", gnutls_strerror (ret));
+      exit(1);
+    }
+
+  if (debug)
+    {
+      printf ("- Received %d bytes: ", ret);
+      for (ii = 0; ii < ret; ii++)
+        {
+          fputc (buffer[ii], stdout);
+        }
+      fputs ("\n", stdout);
+    }
+
+  gnutls_bye (session, GNUTLS_SHUT_RDWR);
+
+end:
+
+  close (fd);
+
+  gnutls_deinit (session);
+
+  gnutls_anon_free_client_credentials (anoncred);
+
+  gnutls_global_deinit ();
 }
 
-void
-doit (void)
+
+/* 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 terminate(void)
 {
-  /* General init. */
+int status;
+
+  kill(child, SIGTERM);
+  wait(&status);
+  exit(1);
+}
+
+static void
+server (int fd, int packet)
+{
+int ret;
+char buffer[MAX_BUF + 1];
+  /* this must be called once in the program
+   */
   gnutls_global_init ();
+
   if (debug)
     {
-      gnutls_global_set_log_function (tls_log_func);
-      gnutls_global_set_log_level (9);
+      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);
+      fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
+      terminate();
+    }
+  if (debug)
+    success ("server: Handshake was completed\n");
 
-  gnutls_anon_allocate_server_credentials (&s_anoncred);
-  gnutls_anon_allocate_client_credentials (&c_anoncred);
+  if (debug)
+    success ("server: TLS version is: %s\n",
+             gnutls_protocol_get_name (gnutls_protocol_get_version
+                                       (session)));
 
-  try1(1);
-  try1(2);
-  try1(3);
-  try1(4);
-  try1(5);
+  /* see the Getting peer's information example */
+  /* print_info(session); */
 
-  gnutls_anon_free_client_credentials (c_anoncred);
-  gnutls_anon_free_server_credentials (s_anoncred);
+  for (;;)
+    {
+      memset (buffer, 0, MAX_BUF + 1);
+      
+      do {
+        ret = gnutls_record_recv (session, buffer, MAX_BUF);
+      } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+      if (ret == 0)
+        {
+          if (debug)
+            success ("server: Peer has closed the GnuTLS connection\n");
+          break;
+        }
+      else if (ret < 0)
+        {
+          fail ("server: Received corrupted data(%d). Closing...\n", ret);
+          terminate();
+        }
+      else if (ret > 0)
+        {
+          /* echo data back to the client
+           */
+          do {
+            ret = gnutls_record_send (session, buffer, strlen (buffer));
+          } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+        }
+    }
+  /* do not wait for the peer to close the connection.
+   */
+  gnutls_bye (session, GNUTLS_SHUT_WR);
+
+  close (fd);
+  gnutls_deinit (session);
+
+  gnutls_anon_free_server_credentials (anoncred);
 
   gnutls_global_deinit ();
+
+  if (debug)
+    success ("server: finished\n");
+}
+
+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)
+    {
+      int status;
+      /* parent */
+      server (fd[0], server_packet);
+      wait (&status);
+      if (WEXITSTATUS(status) != 0)
+        fail("Child died with status %d\n", WEXITSTATUS(status));
+    }
+  else 
+    {
+      client (fd[1], client_packet);
+      exit(0);
+    }
+}
+
+void
+doit (void)
+{
+  start(-1, 1);
+  start(-1, 2);
+  start(-1, 3);
+  start(-1, 4);
+
+  start(1, -1);
+  start(2, -1);
+  start(3, -1);
+  start(4, -1);
+  start(5, -1);
 }
diff --git a/tests/mini-loss2.c b/tests/mini-loss2.c
deleted file mode 100644
index a0c0aa58fd..0000000000
--- a/tests/mini-loss2.c
+++ /dev/null
@@ -1,365 +0,0 @@
-/*
- * 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 "utils.h"
-
-/* This program simulates packet loss in DTLS datagrams using
- * the blocking functions
- */
-
-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.
- */
-
-#define MAX_BUF 1024
-#define MSG "Hello TLS"
-
-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)
-      {
-        int type = gnutls_handshake_get_last_out(session);
-        
-        fprintf(stderr, "Discarding packet %d (%d)\n", counter, type);
-      }
-    return len;
-  }
-  return send(fd, data, len, 0);
-}
-
-static void
-client (int fd, int packet)
-{
-  int ret, ii;
-  char buffer[MAX_BUF + 1];
-  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)
-    {
-      fail ("client: Handshake failed\n");
-      gnutls_perror (ret);
-      exit(1);
-    }
-  else
-    {
-      if (debug)
-        success ("client: Handshake was completed\n");
-    }
-
-  if (debug)
-    success ("client: TLS version is: %s\n",
-             gnutls_protocol_get_name (gnutls_protocol_get_version
-                                       (session)));
-
-  do {
-    ret = gnutls_record_send (session, MSG, strlen (MSG));
-  } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
-
-  do {
-    ret = gnutls_record_recv (session, buffer, MAX_BUF);
-  } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
-
-  if (ret == 0)
-    {
-      if (debug)
-        success ("client: Peer has closed the TLS connection\n");
-      goto end;
-    }
-  else if (ret < 0)
-    {
-      fail ("client: Error: %s\n", gnutls_strerror (ret));
-      exit(1);
-    }
-
-  if (debug)
-    {
-      printf ("- Received %d bytes: ", ret);
-      for (ii = 0; ii < ret; ii++)
-        {
-          fputc (buffer[ii], stdout);
-        }
-      fputs ("\n", stdout);
-    }
-
-  gnutls_bye (session, GNUTLS_SHUT_RDWR);
-
-end:
-
-  close (fd);
-
-  gnutls_deinit (session);
-
-  gnutls_anon_free_client_credentials (anoncred);
-
-  gnutls_global_deinit ();
-}
-
-
-/* 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 terminate(void)
-{
-int status;
-
-  kill(child, SIGTERM);
-  wait(&status);
-  exit(1);
-}
-
-static void
-server (int fd, int packet)
-{
-int ret;
-char buffer[MAX_BUF + 1];
-  /* 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);
-      fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
-      terminate();
-    }
-  if (debug)
-    success ("server: Handshake was completed\n");
-
-  if (debug)
-    success ("server: TLS version is: %s\n",
-             gnutls_protocol_get_name (gnutls_protocol_get_version
-                                       (session)));
-
-  /* see the Getting peer's information example */
-  /* print_info(session); */
-
-  for (;;)
-    {
-      memset (buffer, 0, MAX_BUF + 1);
-      
-      do {
-        ret = gnutls_record_recv (session, buffer, MAX_BUF);
-      } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
-
-      if (ret == 0)
-        {
-          if (debug)
-            success ("server: Peer has closed the GnuTLS connection\n");
-          break;
-        }
-      else if (ret < 0)
-        {
-          fail ("server: Received corrupted data(%d). Closing...\n", ret);
-          terminate();
-        }
-      else if (ret > 0)
-        {
-          /* echo data back to the client
-           */
-          do {
-            ret = gnutls_record_send (session, buffer, strlen (buffer));
-          } while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
-        }
-    }
-  /* do not wait for the peer to close the connection.
-   */
-  gnutls_bye (session, GNUTLS_SHUT_WR);
-
-  close (fd);
-  gnutls_deinit (session);
-
-  gnutls_anon_free_server_credentials (anoncred);
-
-  gnutls_global_deinit ();
-
-  if (debug)
-    success ("server: finished\n");
-}
-
-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)
-    {
-      int status;
-      /* parent */
-      server (fd[0], server_packet);
-      wait (&status);
-      if (WEXITSTATUS(status) != 0)
-        fail("Child died with status %d\n", WEXITSTATUS(status));
-    }
-  else 
-    {
-      client (fd[1], client_packet);
-      exit(0);
-    }
-}
-
-void
-doit (void)
-{
-  start(-1, 1);
-  start(-1, 2);
-  start(-1, 3);
-  start(-1, 4);
-
-  start(1, -1);
-  start(2, -1);
-  start(3, -1);
-}