/*

 * Copyright (C) 2015 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>

# ifndef MSG_NOSIGNAL

int main(void)

{

	exit(77);

}

# else

# include "utils.h"

static

void sigpipe(int sig)

{

	_exit(2);

}

#define BUF_SIZE 64

static void client(int fd)

{

	int ret;

	gnutls_anon_client_credentials_t anoncred;

	gnutls_session_t session;

	char buf[BUF_SIZE];

	char buf2[BUF_SIZE];

	/* Need to enable anonymous KX specifically. */

	global_init();

	if (debug) {

		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,

				   "NONE:+VERS-TLS1.0:+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);

	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));

	ret = gnutls_record_recv(session, buf, sizeof(buf));

	if (ret < 0 || ret != sizeof(buf)) {

		kill(getppid(), SIGPIPE);

		fail("client: recv failed");

	}

	if (debug)

		success("client: received %d bytes\n", ret);

	memset(buf2, 0, sizeof(buf));

	if (memcmp(buf, buf2, sizeof(buf)) != 0) {

		kill(getppid(), SIGPIPE);

		fail("client: recv data failed");

	}

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_global_deinit();

	if (ret < 0) {

		fail("client: Handshake failed with unexpected reason: %s\n", gnutls_strerror(ret));

	} else {

		if (debug)

			success("client: Handshake was completed\n");

	}

}

/* These are global */

pid_t child;

static void server(int fd)

{

	gnutls_anon_server_credentials_t anoncred;

	gnutls_session_t session;

	int ret;

	char buf[BUF_SIZE];

	unsigned i;

	/* this must be called once in the program

	 */

	global_init();

	if (debug) {

		gnutls_global_set_log_level(4711);

	}

	gnutls_anon_allocate_server_credentials(&anoncred);

	gnutls_init(&session, GNUTLS_SERVER|GNUTLS_NO_SIGNAL);

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

	 * are adequate.

	 */

	gnutls_priority_set_direct(session,

				   "NONE:+VERS-TLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL",

				   NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_transport_set_int(session, fd);

	do {

		ret = gnutls_handshake(session);

	}

	while (ret < 0 && (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED));

	if (ret < 0) {

		fail("error in handshake: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	memset(buf, 0, sizeof(buf));

	for (i=0;i<5;i++) {

		sleep(3);

		ret = gnutls_record_send(session, buf, sizeof(buf));

		if (ret < 0)

			break;

	}

	sleep(3);

	gnutls_deinit(session);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_global_deinit();

}

static void start(void)

{

	int fd[2];

	int ret;

	/* we need dgram in this test */

	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[0]);

		server(fd[1]);

		close(fd[1]);

		kill(child, SIGTERM);

	} else {

		close(fd[1]);

		client(fd[0]);

		close(fd[0]);

		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, sigpipe);

	start();

}

# endif /* MSG_NOSIGNAL */

#endif				/* _WIN32 */