/*

 * Copyright (C) 2012-2013 Free Software Foundation, Inc.

 * Copyright (C) 2013 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)

int main()

{

	exit(77);

}

#else

#include <string.h>

#include <errno.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 <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include "utils.h"

static int test_finished = 0;

static void terminate(void);

/* This program tests whether messages in DTLS are received

 * with the expected sequence. That is whether the message

 * sequence numbers returned correspond to the received messages.

 */

/*

static void

tls_audit_log_func (gnutls_session_t session, const char *str)

{

  fprintf (stderr, "|<%p>| %s", session, str);

}

*/

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);

}

/* These are global */

static pid_t child;

/* A test client/server app for DTLS duplicate packet detection.

 */

#define MAX_BUF 1024

#define MAX_SEQ 128

static int msg_seq[] =

    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 16, 5, 32, 11, 11, 11, 11, 12,

	10, 13, 14, 15, 16, 17, 19, 20, 18, 22, 24, 23, 25, 26, 27, 29, 28,

	29, 29, 30, 31, 32, 33, 34, 35, 37, 36, 38, 39, 42, 37, 40, 41, 41,

	-1

};

static unsigned int current = 0;

static unsigned int pos = 0;

unsigned char *stored_messages[MAX_SEQ];

unsigned int stored_sizes[MAX_SEQ];

static ssize_t odd_push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	ssize_t ret;

	unsigned i;

	if (msg_seq[current] == -1 || test_finished != 0) {

		test_finished = 1;

		return len;

	}

	stored_messages[current] = malloc(len);

	memcpy(stored_messages[current], data, len);

	stored_sizes[current] = len;

	if (pos != current) {

		for (i = pos; i <= current; i++) {

			if (stored_messages[msg_seq[i]] != NULL) {

				do {

					ret =

					    send((long int)tr,

						 stored_messages[msg_seq

								 [i]],

						 stored_sizes[msg_seq[i]], 0);

				}

				while (ret == -1 && (errno == EAGAIN || errno == EINTR));

				pos++;

			} else

				break;

		}

	} else if (msg_seq[current] == (int)current) {

		do {

			ret = send((long int)tr, data, len, 0);

		}

		while (ret == -1 && (errno == EAGAIN || errno == EINTR));

		current++;

		pos++;

		return ret;

	} else if (stored_messages[msg_seq[current]] != NULL) {

		do {

			ret =

			    send((long int)tr,

				 stored_messages[msg_seq[current]],

				 stored_sizes[msg_seq[current]], 0);

		}

		while (ret == -1 && (errno == EAGAIN || errno == EINTR));

		current++;

		pos++;

		return ret;

	}

	current++;

	return len;

}

static ssize_t n_push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	return send((unsigned long)tr, data, len, 0);

}

/* The first five messages are handshake. Thus corresponds to msg_seq+5 */

static int recv_msg_seq[] =

    { 1, 2, 3, 4, 5, 6, 12, 28, 7, 8, 9, 10, 11, 13, 15, 16, 14, 18, 20,

	19, 21, 22, 23, 25, 24, 26, 27, 29, 30, 31, 33, 32, 34, 35, 38, 36, 37,

	    -1

};

static void client(int fd)

{

	gnutls_session_t session;

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_anon_client_credentials_t anoncred;

	unsigned char seq[8];

	uint32_t useq;

	memset(buffer, 0, sizeof(buffer));

	/* Need to enable anonymous KX specifically. */

/*    gnutls_global_set_audit_log_function (tls_audit_log_func); */

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(2);

	}

	gnutls_anon_allocate_client_credentials(&anoncred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);

	gnutls_dtls_set_timeouts(session, 50 * 1000, 600 * 1000);

	gnutls_heartbeat_enable(session, GNUTLS_HB_PEER_ALLOWED_TO_SEND);

	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);

	gnutls_transport_set_int(session, fd);

	/* 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");

	}

	gnutls_record_send(session, buffer, 1);

	if (debug)

		success("client: DTLS version is: %s\n",

			gnutls_protocol_get_name

			(gnutls_protocol_get_version(session)));

	do {

		ret =

		    gnutls_record_recv_seq(session, buffer, sizeof(buffer),

					   seq);

		if (ret > 0) {

			useq =

			    seq[7] | (seq[6] << 8) | (seq[5] << 16) |

			    (seq[4] << 24);

			if (debug)

				success("received %u\n", (unsigned int)useq);

			if (recv_msg_seq[current] == -1) {

				fail("received message sequence differs\n");

				terminate();

			}

			if (((uint32_t)recv_msg_seq[current]) != useq) {

				fail("received message sequence differs (current: %u, got: %u, expected: %u)\n",

				     (unsigned)current, (unsigned)useq, (unsigned)recv_msg_seq[current]);

				terminate();

			}

			current++;

		}

	}

	while ((ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED

		|| ret > 0));

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_global_deinit();

}

static void terminate(void)

{

	int status;

	kill(child, SIGTERM);

	wait(&status);

	exit(1);

}

static void server(int fd)

{

	int ret;

	gnutls_session_t session;

	gnutls_anon_server_credentials_t anoncred;

	char c;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(2);

	}

	gnutls_anon_allocate_server_credentials(&anoncred);

	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);

	gnutls_dtls_set_timeouts(session, 50 * 1000, 600 * 1000);

	gnutls_transport_set_push_function(session, odd_push);

	gnutls_heartbeat_enable(session, GNUTLS_HB_PEER_ALLOWED_TO_SEND);

	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);

	gnutls_transport_set_int(session, fd);

	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)));

	gnutls_record_recv(session, &c, 1);

	do {

		do {

			ret = gnutls_record_send(session, &c, 1);

		}

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

		if (ret < 0) {

			fail("send: %s\n", gnutls_strerror(ret));

			terminate();

		}

	}

	while (test_finished == 0);

	gnutls_transport_set_push_function(session, n_push);

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_WR);

	}

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

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void start(void)

{

	int fd[2];

	int ret;

	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[1]);

		server(fd[0]);

		wait(&status);

		check_wait_status(status);

	} else {

		close(fd[0]);

		client(fd[1]);

		exit(0);

	}

}

void doit(void)

{

	start();

}

#endif				/* _WIN32 */