/*

 * Copyright (C) 2008-2012 Free Software Foundation, Inc.

 *

 * Author: Simon Josefsson, 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>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include <gnutls/crypto.h>

#include "utils.h"

#define RANDOMIZE

#define IGNORE_PUSH

#include "eagain-common.h"

const char *side = "";

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

{

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

}

static int handshake = 0;

#define MAX_BUF 1024

#define MSG "Hello TLS, and hi and how are you and more data here... and more... and even more and even more more data..."

static ssize_t

client_push_300(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	size_t newlen;

	if (len > 300) {

		gnutls_transport_set_errno((gnutls_session_t) tr,

					   EMSGSIZE);

		return -1;

	}

	len = min(len, sizeof(to_server) - to_server_len);

	newlen = to_server_len + len;

	memcpy(to_server + to_server_len, data, len);

	to_server_len = newlen;

#ifdef EAGAIN_DEBUG

	fprintf(stderr, "eagain: pushed %d bytes to server (avail: %d)\n",

		(int) len, (int) to_server_len);

#endif

	return len;

}

static ssize_t

server_push_300(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	size_t newlen;

	if (len > 300) {

		gnutls_transport_set_errno((gnutls_session_t) tr,

					   EMSGSIZE);

		return -1;

	}

	len = min(len, sizeof(to_client) - to_client_len);

	newlen = to_client_len + len;

	memcpy(to_client + to_client_len, data, len);

	to_client_len = newlen;

#ifdef EAGAIN_DEBUG

	fprintf(stderr, "eagain: pushed %d bytes to client (avail: %d)\n",

		(int) len, (int) to_client_len);

#endif

	return len;

}

void doit(void)

{

	/* Server stuff. */

	gnutls_anon_server_credentials_t s_anoncred;

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

	static gnutls_dh_params_t dh_params;

	gnutls_session_t server;

	int sret, cret;

	/* Client stuff. */

	gnutls_anon_client_credentials_t c_anoncred;

	gnutls_session_t client;

	/* Need to enable anonymous KX specifically. */

	char buffer[MAX_BUF + 1];

	ssize_t ns;

	int ret, transferred = 0, msglen;

	/* General init. */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(99);

	/* Init server */

	gnutls_anon_allocate_server_credentials(&s_anoncred);

	gnutls_dh_params_init(&dh_params);

	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);

	gnutls_anon_set_server_dh_params(s_anoncred, dh_params);

	gnutls_init(&server,

		    GNUTLS_SERVER | GNUTLS_DATAGRAM | GNUTLS_NONBLOCK);

	ret =

	    gnutls_priority_set_direct(server,

					"NONE:+VERS-DTLS1.2:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",

					NULL);

	if (ret < 0)

		exit(1);

	gnutls_credentials_set(server, GNUTLS_CRD_ANON, s_anoncred);

	gnutls_transport_set_push_function(server, server_push_300);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_pull_timeout_function(server,

						   server_pull_timeout_func);

	gnutls_transport_set_ptr(server, server);

	/* Init client */

	gnutls_anon_allocate_client_credentials(&c_anoncred);

	gnutls_init(&client,

		    GNUTLS_CLIENT | GNUTLS_DATAGRAM | GNUTLS_NONBLOCK);

	cret =

	    gnutls_priority_set_direct(client,

					"NONE:+VERS-DTLS1.2:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",

					NULL);

	if (cret < 0)

		exit(1);

	gnutls_credentials_set(client, GNUTLS_CRD_ANON, c_anoncred);

	gnutls_transport_set_push_function(client, client_push_300);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_pull_timeout_function(client,

						   client_pull_timeout_func);

	gnutls_transport_set_ptr(client, client);

	handshake = 1;

	HANDSHAKE_DTLS(client, server);

	if (gnutls_protocol_get_version(client) != GNUTLS_DTLS1_2) {

		fail("Error in negotiated version\n");

		exit(1);

	}

	handshake = 0;

	if (debug)

		success("Handshake established\n");

	do {

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

	}

	while (ret == GNUTLS_E_AGAIN);

	//success ("client: sent %d\n", ns);

	msglen = strlen(MSG);

	TRANSFER(client, server, MSG, msglen, buffer, MAX_BUF);

	if (debug)

		fputs("\n", stdout);

	gnutls_bye(client, GNUTLS_SHUT_WR);

	gnutls_bye(server, GNUTLS_SHUT_WR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_anon_free_client_credentials(c_anoncred);

	gnutls_anon_free_server_credentials(s_anoncred);

	gnutls_dh_params_deinit(dh_params);

	gnutls_global_deinit();

}