/*

 * Copyright (C) 2016 Red Hat, Inc.

 * Copyright (C) 2016 Guillaume Roguez

 *

 * 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 <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 <assert.h>

#include "cert-common.h"

#include "utils.h"

#define MTU 1500

#define MAX_BUF 4096

#define MSG "Hello TLS"

static int server_fd = -1;

static char pkt_buf[MAX_BUF];

static int pkt_found = 0;

static int pkt_delivered = 0;

static void terminate(void);

/* This program tests the rehandshake from anon

 * to certificate auth in DTLS, but will account for

 * packet reconstruction (with loss/delay) for the certificate packet.

 */

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);

}

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

{

	int fd = (long int)tr;

	if (fd == server_fd) {

		if (!pkt_found && len > 1200) {

			memcpy(pkt_buf, data, len);

			pkt_found = 1;

			if (debug)

				success("*** packet delayed\n");

			return len;

		}

		if (pkt_found && !pkt_delivered) {

			int res = send(fd, data, len, 0);

			send(fd, pkt_buf, MTU, 0);

			pkt_delivered = 1;

			if (debug)

				success("*** swap done\n");

			return res;

		}

	}

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

}

static void client(int fd)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_anon_client_credentials_t anoncred;

	gnutls_session_t session;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(4711);

	}

	assert(gnutls_anon_allocate_client_credentials(&anoncred) >= 0);

	assert(gnutls_certificate_allocate_credentials(&clientx509cred) >= 0);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);

	gnutls_dtls_set_mtu(session, MTU);

	assert(gnutls_priority_set_direct(session,

					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL",

					  NULL) >= 0);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, clientx509cred);

	gnutls_transport_set_int(session, fd);

	gnutls_transport_set_push_function(session, push);

	gnutls_dtls_set_timeouts(session, 2000, 30 * 1000);

	/* 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)));

	/* update priorities to allow cert auth */

	assert(gnutls_priority_set_direct(session,

					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-RSA:+CURVE-ALL",

					  NULL) >= 0);

	do {

		ret = gnutls_record_recv(session, buffer, MAX_BUF);

	} 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) {

		if (ret == GNUTLS_E_REHANDSHAKE) {

			if (debug)

				success

				    ("Initiating rehandshake due to server request\n");

			do {

				ret = gnutls_handshake(session);

			}

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

		}

		if (ret != 0) {

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

			exit(1);

		}

	}

	do {

		ret = gnutls_record_send(session, MSG, strlen(MSG));

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

	gnutls_bye(session, GNUTLS_SHUT_WR);

 end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_anon_free_client_credentials(anoncred);

	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)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_anon_server_credentials_t anoncred;

	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);

	}

	assert(gnutls_anon_allocate_server_credentials(&anoncred) >= 0);

	assert(gnutls_certificate_allocate_credentials(&serverx509cred) >= 0);

	assert(gnutls_certificate_set_x509_key_mem(serverx509cred,

						   &server_cert, &server_key,

						   GNUTLS_X509_FMT_PEM) >= 0);

	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);

	gnutls_dtls_set_mtu(session, MTU);

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

	 * are adequate.

	 */

	assert(gnutls_priority_set_direct(session,

					  "NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ECDHE-RSA:+ANON-ECDH:+CURVE-ALL",

					  NULL) >= 0);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, serverx509cred);

	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)));

	if (gnutls_kx_get(session) != GNUTLS_KX_ANON_ECDH) {

		fail("did not negotiate an anonymous ciphersuite on initial auth\n");

	}

	/* see the Getting peer's information example */

	/* print_info(session); */

	if (debug)

		success("server: Sending dummy packet\n");

	ret = gnutls_rehandshake(session);

	if (ret < 0) {

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

		terminate();

	}

	if (debug)

		success("server: Initiating rehandshake\n");

	do {

		ret = gnutls_handshake(session);

	}

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

	if (ret < 0) {

		fail("server: 2nd gnutls_handshake: %s\n",

		     gnutls_strerror(ret));

		terminate();

	}

	for (;;) {

		memset(buffer, 0, MAX_BUF + 1);

		do {

			ret = gnutls_record_recv(session, buffer, MAX_BUF);

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

		if (ret == 0) {

			if (debug)

				success

				    ("server: Peer has closed the GnuTLS connection\n");

			break;

		} else if (ret < 0) {

			fail("server: Received corrupted data(%s). Closing...\n", gnutls_strerror(ret));

			terminate();

		} else if (ret > 0) {

			/* echo data back to the client

			 */

			do {

				ret =

				    gnutls_record_send(session, buffer,

							strlen(buffer));

			} while (ret == GNUTLS_E_AGAIN

				 || ret == GNUTLS_E_INTERRUPTED);

		}

	}

	if (gnutls_kx_get(session) != GNUTLS_KX_ECDHE_RSA) {

		fail("did not negotiate a certificate ciphersuite on second auth\n");

	}

	/* do not wait for the peer to close the connection.

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	int fd[2];

	int ret;

	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 = 0;

		/* parent */

		server_fd = fd[0];

		server(fd[0]);

		wait(&status);

		check_wait_status(status);

	} else {

		close(fd[0]);

		client(fd[1]);

		exit(0);

	}

}

#endif				/* _WIN32 */