/*

 * Copyright (C) 2016 Red Hat, Inc.

 *

 * 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>

/* In this test we check the parsing of SSL 2.0 client hellos under

 * the default protocols.

 * As we can only read but not generate we use a fixed hello message

 * followed by an alert. That way we detect whether the handshake

 * completed hello parsing and reached the alert message.

 */

#if defined(_WIN32) || !defined(ENABLE_SSL2)

/* socketpair isn't supported on Win32. */

int main(int argc, char **argv)

{

	exit(77);

}

#else

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#if !defined(_WIN32)

#include <sys/wait.h>

#endif

#include <unistd.h>

#include <gnutls/gnutls.h>

#include "utils.h"

#include "cert-common.h"

pid_t child;

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,

		str);

}

/* A very basic TLS client, with anonymous authentication.

 */

static unsigned char ssl2_hello[] =

	"\x80\x59\x01\x03\x01\x00\x30\x00\x00\x00\x20\x00\x00\x39\x00\x00"

	"\x38\x00\x00\x35\x00\x00\x16\x00\x00\x13\x00\x00\x0a\x00\x00\x33"

	"\x00\x00\x32\x00\x00\x2f\x00\x00\x07\x00\x00\x05\x00\x00\x04\x00"

	"\x00\x15\x00\x00\x12\x00\x00\x09\x00\x00\xff\xb1\xc9\x95\x1a\x02"

	"\x6c\xd6\x42\x11\x6e\x99\xe2\x84\x97\xc9\x17\x53\xaf\x53\xf7\xfc"

	"\x8d\x1e\x72\x87\x18\x53\xee\xa6\x7d\x18\xc6";

static unsigned char tls_alert[] = 

	"\x15\x03\x01\x00\x02\x02\x5A";

static void client(int sd)

{

	char buf[1024];

	int ret;

	/* send an SSL 2.0 hello, and then an alert */

	ret = send(sd, ssl2_hello, sizeof(ssl2_hello)-1, 0);

	if (ret < 0)

		fail("error sending hello\n");

	ret = recv(sd, buf, sizeof(buf), 0);

	if (ret < 0)

		fail("error receiving hello\n");

	ret = send(sd, tls_alert, sizeof(tls_alert)-1, 0);

	if (ret < 0)

		fail("error sending hello\n");

	close(sd);

}

static void server(int sd)

{

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	int ret;

	/* this must be called once in the program

	 */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	gnutls_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,

					      GNUTLS_X509_FMT_PEM);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,

					    &server_ca3_key,

					    GNUTLS_X509_FMT_PEM);

	if (debug)

		success("Launched, generating DH parameters...\n");

	gnutls_init(&session, GNUTLS_SERVER);

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

	 * are adequate.

	 */

	gnutls_priority_set_direct(session, "NORMAL", NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, sd);

	ret = gnutls_handshake(session);

	if (ret != GNUTLS_E_FATAL_ALERT_RECEIVED || gnutls_alert_get(session) != GNUTLS_A_USER_CANCELED) {

		fail("server: Handshake failed unexpectedly (%s)\n\n",

		     gnutls_strerror(ret));

		return;

	}

	if (debug) {

		success("server: Handshake parsed the SSL2.0 client hello\n");

	}

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	int sockets[2];

	int err;

	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);

	if (err == -1) {

		perror("socketpair");

		fail("socketpair failed\n");

		return;

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		return;

	}

	if (child) {

		int status;

		close(sockets[1]);

		server(sockets[0]);

		wait(&status);

		check_wait_status(status);

	} else {

		close(sockets[0]);

		client(sockets[1]);

		exit(0);

	}

}

#endif				/* _WIN32 */