/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2016-2018 Fox Crypto B.V. <openvpn@fox-it.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program 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 this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif

#include "syshead.h"

#include <stdarg.h>
#include <stddef.h>
#include <setjmp.h>
#include <cmocka.h>

#include "packet_id.h"

#include "mock_msg.h"

struct test_packet_id_write_data {
    struct {
        uint32_t buf_id;
        uint32_t buf_time;
    } test_buf_data;
    struct buffer test_buf;
    struct packet_id_send pis;
};

static int
test_packet_id_write_setup(void **state) {
    struct test_packet_id_write_data *data =
            calloc(1, sizeof(struct test_packet_id_write_data));

    if (!data)
    {
        return -1;
    }

    data->test_buf.data = (void *) &data->test_buf_data;
    data->test_buf.capacity = sizeof(data->test_buf_data);

    *state = data;
    return 0;
}

static int
test_packet_id_write_teardown(void **state) {
    free(*state);
    return 0;
}

static void
test_packet_id_write_short(void **state)
{
    struct test_packet_id_write_data *data = *state;

    now = 5010;
    assert_true(packet_id_write(&data->pis, &data->test_buf, false, false));
    assert_true(data->pis.id == 1);
    assert_true(data->test_buf_data.buf_id == htonl(1));
    assert_true(data->test_buf_data.buf_time == 0);
}

static void
test_packet_id_write_long(void **state)
{
    struct test_packet_id_write_data *data = *state;

    now = 5010;
    assert_true(packet_id_write(&data->pis, &data->test_buf, true, false));
    assert(data->pis.id == 1);
    assert(data->pis.time == now);
    assert_true(data->test_buf_data.buf_id == htonl(1));
    assert_true(data->test_buf_data.buf_time == htonl(now));
}

static void
test_packet_id_write_short_prepend(void **state)
{
    struct test_packet_id_write_data *data = *state;

    data->test_buf.offset = sizeof(packet_id_type);
    now = 5010;
    assert_true(packet_id_write(&data->pis, &data->test_buf, false, true));
    assert_true(data->pis.id == 1);
    assert_true(data->test_buf_data.buf_id == htonl(1));
    assert_true(data->test_buf_data.buf_time == 0);
}

static void
test_packet_id_write_long_prepend(void **state)
{
    struct test_packet_id_write_data *data = *state;

    data->test_buf.offset = sizeof(data->test_buf_data);
    now = 5010;
    assert_true(packet_id_write(&data->pis, &data->test_buf, true, true));
    assert(data->pis.id == 1);
    assert(data->pis.time == now);
    assert_true(data->test_buf_data.buf_id == htonl(1));
    assert_true(data->test_buf_data.buf_time == htonl(now));
}

static void
test_packet_id_write_short_wrap(void **state)
{
    struct test_packet_id_write_data *data = *state;

    data->pis.id = ~0;
    assert_false(packet_id_write(&data->pis, &data->test_buf, false, false));
}

static void
test_packet_id_write_long_wrap(void **state)
{
    struct test_packet_id_write_data *data = *state;

    data->pis.id = ~0;
    data->pis.time = 5006;

    /* Write fails if time did not change */
    now = 5006;
    assert_false(packet_id_write(&data->pis, &data->test_buf, true, false));

    /* Write succeeds if time moved forward */
    now = 5010;
    assert_true(packet_id_write(&data->pis, &data->test_buf, true, false));

    assert(data->pis.id == 1);
    assert(data->pis.time == now);
    assert_true(data->test_buf_data.buf_id == htonl(1));
    assert_true(data->test_buf_data.buf_time == htonl(now));
}

int
main(void) {
    const struct CMUnitTest tests[] = {
            cmocka_unit_test_setup_teardown(test_packet_id_write_short,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
            cmocka_unit_test_setup_teardown(test_packet_id_write_long,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
            cmocka_unit_test_setup_teardown(test_packet_id_write_short_prepend,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
            cmocka_unit_test_setup_teardown(test_packet_id_write_long_prepend,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
            cmocka_unit_test_setup_teardown(test_packet_id_write_short_wrap,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
            cmocka_unit_test_setup_teardown(test_packet_id_write_long_wrap,
                    test_packet_id_write_setup, test_packet_id_write_teardown),
    };

    return cmocka_run_group_tests_name("packet_id tests", tests, NULL, NULL);
}