/*

 * Copyright (C) 2004-2012 Free Software Foundation, Inc.

 * Copyright (C) 2013 Adam Sampson <ats@offog.org>

 *

 * Author: Simon Josefsson

 *

 * 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

 */

/* Parts copied from GnuTLS example programs. */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

/* This program tests anonymous authentication as well as the gnutls_record_recv_packet.

 */

#if defined(_WIN32)

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

int main(int argc, char **argv)

{

	exit(77);

}

#else

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#if !defined(_WIN32)

#include <sys/wait.h>

#endif

#include <unistd.h>

#include <gnutls/gnutls.h>

#include "utils.h"

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

{

	fprintf(stderr, "|<%d>| %s", level, str);

}

#define MAX_BUF 1024

#define MSG "Hello TLS"

static void client(int sd)

{

	int ret, ii;

	gnutls_session_t session;

	char buffer[MAX_BUF + 1];

	gnutls_anon_client_credentials_t anoncred;

	/* Need to enable anonymous KX specifically. */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	gnutls_anon_allocate_client_credentials(&anoncred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT);

	/* Use default priorities */

	gnutls_priority_set_direct(session,

				   "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",

				   NULL);

	/* put the anonymous credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_transport_set_int(session, sd);

	/* Perform the TLS handshake

	 */

	ret = gnutls_handshake(session);

	if (ret < 0) {

		fail("client: Handshake failed\n");

		gnutls_perror(ret);

		goto end;

	} else {

		if (debug)

			success("client: Handshake was completed\n");

	}

	print_dh_params_info(session);

	if (debug)

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

			gnutls_protocol_get_name

			(gnutls_protocol_get_version(session)));

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

	if (ret != sizeof(MSG)-1) {

		fail("return value of gnutls_record_send() is bogus\n");

		exit(1);

	}

	ret = gnutls_record_recv(session, buffer, MAX_BUF);

	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));

		goto end;

	}

	if (ret != sizeof(MSG)-1 || memcmp(buffer, MSG, ret) != 0) {

		fail("client: received data of different size! (expected: %d, have: %d)\n", 

			(int)strlen(MSG), ret);

		goto end;

	}

	if (debug) {

		printf("- Received %d bytes: ", ret);

		for (ii = 0; ii < ret; ii++) {

			fputc(buffer[ii], stdout);

		}

		fputs("\n", stdout);

	}

	gnutls_bye(session, GNUTLS_SHUT_RDWR);

      end:

	close(sd);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_global_deinit();

}

/* This is a sample TLS 1.0 echo server, for anonymous authentication only.

 */

#define MAX_BUF 1024

#define DH_BITS 1024

/* These are global */

gnutls_anon_server_credentials_t anoncred;

static gnutls_session_t initialize_tls_session(void)

{

	gnutls_session_t session;

	gnutls_init(&session, GNUTLS_SERVER);

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

	 * are adequate.

	 */

	gnutls_priority_set_direct(session,

				   "NONE:+VERS-TLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",

				   NULL);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	gnutls_dh_set_prime_bits(session, DH_BITS);

	return session;

}

static gnutls_dh_params_t dh_params;

static int generate_dh_params(void)

{

	const gnutls_datum_t p3 = { (void *) pkcs3, strlen(pkcs3) };

	gnutls_dh_params_init(&dh_params);

	return gnutls_dh_params_import_pkcs3(dh_params, &p3,

					     GNUTLS_X509_FMT_PEM);

}

int err, ret;

char topbuf[512];

gnutls_session_t session;

char buffer[MAX_BUF + 1];

int optval = 1;

static void server(int sd)

{

	gnutls_packet_t packet;

	/* 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(4711);

	gnutls_anon_allocate_server_credentials(&anoncred);

	if (debug)

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

	generate_dh_params();

	gnutls_anon_set_server_dh_params(anoncred, dh_params);

	session = initialize_tls_session();

	gnutls_transport_set_int(session, sd);

	ret = gnutls_handshake(session);

	if (ret < 0) {

		close(sd);

		gnutls_deinit(session);

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

		     gnutls_strerror(ret));

		return;

	}

	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)));

	print_dh_params_info(session);

	for (;;) {

		ret = gnutls_record_recv_packet(session, &packet);

		if (ret == 0) {

			gnutls_packet_deinit(packet);

			if (debug)

				success

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

			break;

		} else if (ret < 0) {

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

			break;

		} else if (ret > 0) {

			gnutls_datum_t pdata;

			gnutls_packet_get(packet, &pdata, NULL);

			/* echo data back to the client

			 */

			gnutls_record_send(session, pdata.data,

					   pdata.size);

			gnutls_packet_deinit(packet);

		}

	}

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

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(sd);

	gnutls_deinit(session);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_dh_params_deinit(dh_params);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	pid_t child;

	int sockets[2];

	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;

		/* parent */

		server(sockets[0]);

		wait(&status);

	} else

		client(sockets[1]);

}

#endif				/* _WIN32 */