/*

 * 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 the handshake timeout value is enforced.

 */

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 void client(int fd, int wait)

{

	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_handshake_set_timeout(session, 20 * 1000);

	/* Use default priorities */

	gnutls_priority_set_direct(session, "NORMAL:+ANON-ECDH", NULL);

	/* put the anonymous credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_transport_set_int(session, fd);

	/* Perform the TLS handshake

	 */

	do {

		ret = gnutls_handshake(session);

	}

	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_global_deinit();

	if (ret < 0) {

		if (ret != GNUTLS_E_TIMEDOUT || wait == 0) {

			if (debug)

				fail("client: unexpected error: %s\n",

				     gnutls_strerror(ret));

			exit(1);

		}

		if (debug)

			success("client: expected timeout occurred\n");

		return;

	} else {

		if (wait != 0) {

			fail("client: handshake was completed unexpectedly\n");

			gnutls_perror(ret);

			exit(1);

		}

	}

	return;

}

static void initialize_tls_session(gnutls_session_t * session)

{

	gnutls_init(session, GNUTLS_SERVER);

	/* avoid calling all the priority functions, since the defaults

	 * are adequate.

	 */

	gnutls_priority_set_direct(*session, "NORMAL:+ANON-ECDH", NULL);

}

static void server(int fd, int wait)

{

	int ret;

	gnutls_session_t session;

	gnutls_anon_server_credentials_t anoncred;

	/* 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);

	initialize_tls_session(&session);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_transport_set_int(session, fd);

	if (wait) {

		sec_sleep(25);

	} else {

		do {

			ret = gnutls_handshake(session);

		}

		while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

		if (ret == 0)

			gnutls_bye(session, GNUTLS_SHUT_RDWR);

	}

	gnutls_deinit(session);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_global_deinit();

}

static void start(int wait)

{

	int fd[2];

	int ret;

	pid_t child;

	if (debug && wait)

		fprintf(stderr, "\nWill test timeout\n");

	ret = socketpair(AF_UNIX, SOCK_STREAM, 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[1]);

		server(fd[0], wait);

		close(fd[0]);

	} else {

		close(fd[0]);

		client(fd[1], wait);

		close(fd[1]);

		exit(0);

	}

}

static void ch_handler(int sig)

{

	int status = 0;

	wait(&status);

	check_wait_status(status);

	return;

}

void doit(void)

{

	signal(SIGCHLD, ch_handler);

	signal(SIGPIPE, SIG_IGN);

	/* make sure that normal handshake occurs */

	start(0);

	/* check the handshake with an expected timeout */

	start(1);

}

#endif				/* _WIN32 */