/*
* 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>
#if defined(_WIN32)
int main()
{
exit(77);
}
#else
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <gnutls/gnutls.h>
#include <gnutls/dtls.h>
#include <signal.h>
#include "utils.h"
/* This program tests whether a DTLS handshake would timeout
* in the expected time.
*/
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
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;
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, unsigned timeout)
{
int ret;
gnutls_anon_client_credentials_t anoncred;
gnutls_session_t session;
/* Need to enable anonymous KX specifically. */
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);
gnutls_dtls_set_timeouts(session, 1 * 1000, timeout * 1000);
/* 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;
gnutls_transport_set_int(session, fd);
/* Perform the TLS handshake
*/
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED));
gnutls_deinit(session);
gnutls_anon_free_client_credentials(anoncred);
gnutls_global_deinit();
if (ret < 0) {
if (ret == GNUTLS_E_TIMEDOUT) {
if (debug)
success("client: received timeout\n");
return;
}
fail("client: Handshake failed with unexpected reason: %s\n", gnutls_strerror(ret));
} else {
fail("client: Handshake was completed (unexpected)\n");
}
}
/* These are global */
pid_t child;
static void server(int fd, int packet, unsigned timeout)
{
gnutls_anon_server_credentials_t anoncred;
gnutls_session_t session;
int ret;
/* this must be called once in the program
*/
global_init();
if (debug) {
gnutls_global_set_log_function(server_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_anon_allocate_server_credentials(&anoncred);
gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
gnutls_dtls_set_mtu(session, 1500);
gnutls_dtls_set_timeouts(session, 1 * 1000, timeout * 1000);
/* 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);
counter = 0;
packet_to_lose = packet;
gnutls_transport_set_int(session, fd);
gnutls_transport_set_push_function(session, push);
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED));
gnutls_deinit(session);
gnutls_anon_free_server_credentials(anoncred);
gnutls_global_deinit();
if (ret < 0) {
if (ret == GNUTLS_E_TIMEDOUT) {
if (debug)
success("server received timeout\n");
return;
}
fail("server: Handshake failed with unexpected reason: %s\n", gnutls_strerror(ret));
} else {
fail("server: Handshake was completed (unexpected)\n");
}
if (ret < 0) {
return;
}
}
static void start(int server_packet, int wait_server)
{
int fd[2];
int ret;
if (debug)
fprintf(stderr, "\nWill discard server packet %d\n",
server_packet);
/* we need dgram in this test */
ret = socketpair(AF_UNIX, 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 */
close(fd[0]);
if (wait_server)
server(fd[1], server_packet, 30);
else
client(fd[1], 30);
close(fd[1]);
kill(child, SIGTERM);
} else {
close(fd[1]);
if (wait_server)
client(fd[0], 32);
else
server(fd[0], server_packet, 32);
close(fd[0]);
exit(0);
}
}
static void ch_handler(int sig)
{
int status = 0;
wait(&status);
check_wait_status(status);
return;
}
void doit(void)
{
time_t tstart, tstop;
int tries = 5; /* we try multiple times because in very busy systems the suite may fail to finish on time */
signal(SIGCHLD, ch_handler);
signal(SIGPIPE, SIG_IGN);
for (;tries>=0;tries--) {
tstart = time(0);
start(2, 0);
tstop = time(0);
tstop = tstop - tstart;
if (!(tstop < 40 && tstop > 25)) {
if (tries == 0)
fail("Client wait time difference: %u\n", (unsigned) tstop);
else if (debug)
success("Client wait time difference: %u\n", (unsigned) tstop);
} else break;
}
for (;tries>=0;tries--) {
tstart = time(0);
start(2, 1);
tstop = time(0);
tstop = tstop - tstart;
if (!(tstop < 40 && tstop > 25)) {
if (tries == 0)
fail("Server wait time difference: %u\n", (unsigned) tstop);
else if (debug)
success("Server wait time difference: %u\n", (unsigned) tstop);
} else break;
}
}
#endif /* _WIN32 */