/*

 * Copyright (C) 2019 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 */

#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 <signal.h>

#include <assert.h>

#include <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include "utils.h"

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 DTLS client handling DTLS 1.2 resumption under AnyConnect protocol which sets premaster secret.

 */

#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 gnutls_datum_t master =

    { (void*)"\x44\x66\x44\xa9\xb6\x29\xed\x6e\xd6\x93\x15\xdb\xf0\x7d\x4b\x2e\x18\xb1\x9d\xed\xff\x6a\x86\x76\xc9\x0e\x16\xab\xc2\x10\xbb\x17\x99\x24\xb1\xd9\xb9\x95\xe7\xea\xea\xea\xea\xea\xff\xaa\xac", 48};

static gnutls_datum_t sess_id =

    { (void*)"\xd9\xb9\x95\xe7\xea", 5};

static void client(int fd, const char *prio, int proto, int cipher, int kx, int mac, const char *exp_desc)

{

	int ret;

	char buffer[MAX_BUF + 1];

	char *desc;

	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);

	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);

	ret = gnutls_session_set_premaster(session, GNUTLS_CLIENT,

		proto, kx, cipher, mac,

		GNUTLS_COMP_NULL, &master, &sess_id);

	if (ret < 0) {

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

		exit(1);

	}

	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");

	}

	desc = gnutls_session_get_desc(session);

	if (desc == NULL)

		fail("client: gnutls_session_get_desc: NULL\n");

	if (strcmp(desc, exp_desc) != 0)

		fail("client: gnutls_session_get_desc: found null str: %s\n", desc);

	success(" - connected with: %s\n", desc);

	gnutls_free(desc);

	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);

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

      end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

}

static void server(int fd, const char *prio, int proto, int cipher, int kx, int mac)

{

	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);

	gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_dtls_set_mtu(session, 1500);

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

	 * are adequate.

	 */

	assert(gnutls_priority_set_direct(session,

					  prio,

					  NULL) >= 0);

	ret = gnutls_session_set_premaster(session, GNUTLS_SERVER,

		proto, kx, cipher, mac,

		GNUTLS_COMP_NULL, &master, &sess_id);

	if (ret < 0) {

		fail("server: gnutls_session_set_premaster failed: %s\n", gnutls_strerror(ret));

		exit(1);

	}

	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));

	}

	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));

	}

	/* 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(xcred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void run(const char *name, const char *prio, int proto, int cipher, int kx, int mac, const char *exp_desc)

{

	int fd[2];

	int ret;

	pid_t child;

	success("Testing %s\n", name);

	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], prio, proto, cipher, kx, mac);

		wait(&status);

		check_wait_status(status);

		close(fd[0]);

	} else {

		close(fd[0]);

		client(fd[1], prio, proto, cipher, kx, mac, exp_desc);

		close(fd[1]);

		exit(0);

	}

}

void doit(void)

{

	signal(SIGPIPE, SIG_IGN);

	run("dtls1.2-aes128-ecdhe", "NONE:+VERS-DTLS1.2:+COMP-NULL:+AES-128-GCM:+AEAD:+ECDHE-RSA:+SIGN-ALL:%COMPAT",

	    GNUTLS_DTLS1_2, GNUTLS_CIPHER_AES_128_GCM, GNUTLS_KX_ECDHE_RSA, GNUTLS_MAC_AEAD, "(DTLS1.2)-(ECDHE-RSA)-(AES-128-GCM)");

	run("dtls1.2-aes256-ecdhe", "NONE:+VERS-DTLS1.2:+COMP-NULL:+AES-256-GCM:+AEAD:+ECDHE-RSA:+SIGN-ALL:%COMPAT",

	    GNUTLS_DTLS1_2, GNUTLS_CIPHER_AES_256_GCM, GNUTLS_KX_ECDHE_RSA, GNUTLS_MAC_AEAD, "(DTLS1.2)-(ECDHE-RSA)-(AES-256-GCM)");

	run("dtls1.2-aes128-rsa", "NONE:+VERS-DTLS1.2:+COMP-NULL:+AES-128-GCM:+AEAD:+RSA:+SIGN-ALL:%COMPAT",

	    GNUTLS_DTLS1_2, GNUTLS_CIPHER_AES_128_GCM, GNUTLS_KX_RSA, GNUTLS_MAC_AEAD, "(DTLS1.2)-(RSA)-(AES-128-GCM)");

	run("dtls1.2-aes256-rsa", "NONE:+VERS-DTLS1.2:+COMP-NULL:+AES-256-GCM:+AEAD:+RSA:+SIGN-ALL:%COMPAT",

	    GNUTLS_DTLS1_2, GNUTLS_CIPHER_AES_256_GCM, GNUTLS_KX_RSA, GNUTLS_MAC_AEAD, "(DTLS1.2)-(RSA)-(AES-256-GCM)");

}

#endif				/* _WIN32 */