/*

 * Copyright (C) 2018 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>

#include <string.h>

#include <errno.h>

#include <assert.h>

#include <gnutls/gnutls.h>

#include "utils.h"

#include "eagain-common.h"

#include "cert-common.h"

const char *side;

static gnutls_datum_t test_id = { (void*)"\xff\xff\xff\xff\xff\xff", 6 };

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

{

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

}

static gnutls_datum_t dbdata = {NULL, 0};

static int

wrap_db_store(void *dbf, gnutls_datum_t key, gnutls_datum_t data)

{

	unsigned *try_resume = dbf;

	assert(dbdata.data == NULL);

	if (!(*try_resume))

		return 0;

	dbdata.data = gnutls_malloc(data.size);

	assert(dbdata.data != NULL);

	memcpy(dbdata.data, data.data, data.size);

	dbdata.size = data.size;

	return 0;

}

static gnutls_datum_t wrap_db_fetch(void *dbf, gnutls_datum_t key)

{

	unsigned *try_resume = dbf;

	gnutls_datum_t r = {NULL, 0};

	if (key.size != test_id.size || memcmp(test_id.data, key.data, test_id.size) != 0)

		fail("received ID does not match the expected\n");

	if (!(*try_resume))

		return r;

	r.data = gnutls_malloc(dbdata.size);

	assert(r.data != NULL);

	memcpy(r.data, dbdata.data, dbdata.size);

	r.size = dbdata.size;

	return r;

}

static int wrap_db_delete(void *dbf, gnutls_datum_t key)

{

	return 0;

}

static void start(const char *test, unsigned try_resume)

{

	int ret;

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_session_t client;

	int cret = GNUTLS_E_AGAIN;

	gnutls_datum_t data;

	char buf[128];

	success("%s\n", test);

	reset_buffers();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

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

	assert(gnutls_certificate_set_x509_key_mem(serverx509cred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM)>=0);

	assert(gnutls_init(&server, GNUTLS_SERVER)>=0);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	gnutls_set_default_priority(server);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	gnutls_db_set_retrieve_function(server, wrap_db_fetch);

	gnutls_db_set_remove_function(server, wrap_db_delete);

	gnutls_db_set_store_function(server, wrap_db_store);

	gnutls_db_set_ptr(server, &try_resume);

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

	assert(gnutls_certificate_set_x509_trust_mem(clientx509cred, &ca_cert, GNUTLS_X509_FMT_PEM)>=0);

	assert(gnutls_init(&client, GNUTLS_CLIENT)>=0);

	assert(gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				      clientx509cred)>=0);

	assert(gnutls_priority_set_direct(client, "NORMAL:-VERS-ALL:+VERS-TLS1.2", NULL)>=0);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_ptr(client, client);

	memset(buf, 0, sizeof(buf));

	ret = gnutls_session_set_data(client, buf, sizeof(buf));

	if (ret != GNUTLS_E_DB_ERROR) {

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

	}

	HANDSHAKE(client, server);

	ret = gnutls_session_get_data2(client, &data);

	if (ret != 0) {

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

	}

	gnutls_deinit(client);

	gnutls_deinit(server);

	assert(gnutls_init(&server, GNUTLS_SERVER)>=0);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	gnutls_set_default_priority(server);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	gnutls_db_set_retrieve_function(server, wrap_db_fetch);

	gnutls_db_set_remove_function(server, wrap_db_delete);

	gnutls_db_set_store_function(server, wrap_db_store);

	gnutls_db_set_ptr(server, &try_resume);

	assert(gnutls_init(&client, GNUTLS_CLIENT)>=0);

	assert(gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				      clientx509cred)>=0);

	assert(gnutls_priority_set_direct(client, "NORMAL:-VERS-ALL:+VERS-TLS1.2", NULL)>=0);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_ptr(client, client);

	memset(buf, 0, sizeof(buf));

	ret = gnutls_session_set_id(client, &test_id);

	if (ret != 0) {

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

	}

	gnutls_free(data.data);

	if (try_resume) {

		HANDSHAKE_EXPECT(client, server, GNUTLS_E_UNEXPECTED_PACKET, GNUTLS_E_AGAIN);

	} else {

		HANDSHAKE(client, server);

	}

	assert(gnutls_session_resumption_requested(client) == 0);

	gnutls_bye(client, GNUTLS_SHUT_RDWR);

	gnutls_bye(server, GNUTLS_SHUT_RDWR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_free(dbdata.data);

	dbdata.size = 0;

}

void doit(void)

{

	start("functional: see if session ID is sent", 0);

	start("negative: see if the expected error is seen on client side", 1);

}