--- /dev/null
+/*
+ * 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);
+}
projects / thirdparty / gnutls.git / commitdiff
