/* vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80: */

/*

 * Copyright (c) 2016 Red Hat, Inc.

 * Author: Nathaniel McCallum <npmccallum@redhat.com>

 *

 * This program is free software: you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 2.1 of the License, or

 * (at your option) any later version.

 *

 * 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 Lesser 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 <http://www.gnu.org/licenses/>.

 */

#include <assert.h>

#include <error.h>

#include <errno.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "test.h"

char filename[] = "/tmp/luksmetaXXXXXX";

static size_t

first_nonzero(FILE *file, size_t start, size_t length)

{

    uint8_t *buffer;

    buffer = malloc(length);

    if (!buffer)

        return false;

    if (fseek(file, start, SEEK_SET) != 0) {

        free(buffer);

        return false;

    }

    if (fread(buffer, length, 1, file) != 1) {

        free(buffer);

        return false;

    }

    for (size_t i = 0; i < length; i++) {

        if (buffer[i] != 0) {

            free(buffer);

            return i;

        }

    }

    free(buffer);

    return length;

}

bool

test_layout(range_t *ranges)

{

    bool valid = false;

    FILE *file = NULL;

    file = fopen(filename, "r");

    if (!file)

        return false;

    for (size_t i = 0; ranges[i].length != 0; i++) {

        size_t nonzero;

        fprintf(stderr, "%08zu:%08zu (%c= 0)\n",

                ranges[i].start, ranges[i].start + ranges[i].length,

                ranges[i].zero ? '=' : '!');

        nonzero = first_nonzero(file, ranges[i].start, ranges[i].length);

        if (ranges[i].zero && nonzero < ranges[i].length) {

            fprintf(stderr, "unexpected nonzero: %zu\n", nonzero);

            goto egress;

        } else if (!ranges[i].zero && nonzero == ranges[i].length) {

            fprintf(stderr, "unexpected zero: %zu-%zu\n",

                    ranges[i].start, ranges[i].start + ranges[i].length);

            goto egress;

        }

    }

    valid = true;

egress:

    fclose(file);

    return valid;

}

void

test_hole(struct crypt_device *cd, uint32_t *offset, uint32_t *length)

{

    uint64_t payload_offset = 0;

    uint64_t keyarea_end = 0;

    int r = 0;

    payload_offset = crypt_get_data_offset(cd) * 512;

    if (payload_offset < ALIGN(1, true))

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    for (int slot = 0; slot < crypt_keyslot_max(CRYPT_LUKS1); slot++) {

        uint64_t off = 0;

        uint64_t len = 0;

        r = crypt_keyslot_area(cd, slot, &off, &len;;

        if (r < 0)

            error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

        if (off + len > keyarea_end)

            keyarea_end = off + len;

    }

    *offset = ALIGN(keyarea_end, true);

    *length = ALIGN(payload_offset, false) - *offset;

}

struct crypt_device *

test_format(void)

{

    struct crypt_device *cd = NULL;

    int fd;

    int r;

    fd = mkstemp(filename);

    if (fd < 0)

        error(EXIT_FAILURE, errno, "%s:%d", __FILE__, __LINE__);

    /* Create a 4MB sparse file. */

    if (lseek(fd, 4194303, SEEK_SET) == -1)

        error(EXIT_FAILURE, errno, "%s:%d", __FILE__, __LINE__);

    if (write(fd, "", 1) != 1)

        error(EXIT_FAILURE, errno, "%s:%d", __FILE__, __LINE__);

    close(fd);

    r = crypt_init(&cd, filename);

    if (r < 0)

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    r = crypt_format(cd, CRYPT_LUKS1, "aes", "xts-plain64",

                     NULL, NULL, 32, NULL);

    if (r < 0)

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    return cd;

}

struct crypt_device *

test_init(void)

{

    struct crypt_device *cd = NULL;

    int r;

    r = crypt_init(&cd, filename);

    if (r < 0)

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    r = crypt_load(cd, CRYPT_LUKS1, NULL);

    if (r < 0)

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    r = luksmeta_init(cd);

    if (r < 0)

        error(EXIT_FAILURE, -r, "%s:%d", __FILE__, __LINE__);

    return cd;

}