/*

 * Copyright (C) 2015 Nikos Mavrogiannopoulos

 *

 * 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>

#if defined(_WIN32) || !defined(HAVE_LIBSECCOMP)

int main()

{

	exit(77);

}

#else

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <signal.h>

#include <assert.h>

#include <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include "cert-common.h"

#include "utils.h"

static void terminate(void);

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);

}

#define MAX_BUF 1024

static ssize_t

push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	int fd = (long int) tr;

	return send(fd, data, len, 0);

}

static void client(int fd, const char *prio)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_certificate_credentials_t xcred;

	gnutls_session_t session;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&xcred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);

	gnutls_dtls_set_mtu(session, 1500);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

	gnutls_transport_set_int(session, 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_recv(session, buffer, sizeof(buffer)-1);

	} 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);

	}

	ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

	if (ret < 0) {

		fail("server: error in closing session: %s\n", gnutls_strerror(ret));

	}

      end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

}

/* These are global */

pid_t child;

static void terminate(void)

{

	int status;

	kill(child, SIGTERM);

	wait(&status);

	exit(1);

}

static void server(int fd, const char *prio)

{

	int ret;

	gnutls_certificate_credentials_t xcred;

	char buffer[MAX_BUF + 1];

	gnutls_session_t session;

	/* 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_certificate_allocate_credentials(&xcred);

	ret = gnutls_certificate_set_x509_key_mem(xcred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

	ret = disable_system_calls();

	if (ret < 0) {

		fprintf(stderr, "could not enable seccomp\n");

		exit(2);

	}

	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_dtls_set_mtu(session, 1500);

	assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

	gnutls_transport_set_int(session, 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); */

	memset(buffer, 1, sizeof(buffer));

	do {

		ret = gnutls_record_send(session, buffer, sizeof(buffer)-1);

	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret < 0) {

		close(fd);

		gnutls_deinit(session);

		fail("server: data sending has failed (%s)\n\n",

		     gnutls_strerror(ret));

		terminate();

	}

	ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

	if (ret < 0) {

		fail("server: error in closing session: %s\n", gnutls_strerror(ret));

	}

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static 

void run(const char *name, const char *prio)

{

	int fd[2];

	int ret;

	success("trying: %s\n", name);

	signal(SIGPIPE, SIG_IGN);

	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) {

		int status;

		/* parent */

		close(fd[0]);

		client(fd[1], prio);

		wait(&status);

		check_wait_status(status);

	} else {

		close(fd[1]);

		server(fd[0], prio);

		exit(0);

	}

}

void doit(void)

{

	run("dtls1.0", "NORMAL:-KX-ALL:+ECDHE-RSA:-VERS-ALL:+VERS-DTLS1.0");

	run("dtls1.2", "NORMAL:-KX-ALL:+ECDHE-RSA:-VERS-ALL:+VERS-DTLS1.2");

	run("default", "NORMAL");

}

#endif				/* _WIN32 */