Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program 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 2 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

#include "zbxcommon.h"

​

#include "string.h"

#include "zbxsysinfo.h"

#include <time.h>

#include <stdlib.h>

​

#ifdef HAVE_SYS_UTSNAME_H

#   include <sys/utsname.h>

#endif

​

#define CUID_PID_BLOCK_SIZE     2

#define CUID_HOSTNAME_BLOCK_SIZE    2

#define CUID_BLOCK_SIZE         4

#define CUID_BASE_36            36

#define DISCRETE_VALUES         1679616

#define CUID_TIMESTAMP_SIZE     8

#define PID_TMP_36_BASE_BUF_LEN     10

#define HOST_TMP_36_BASE_BUF_LEN    10

#define RAND_TMP_36_BASE_BUF_LEN    10

​

#define PAD_FILL_CHAR           '0'

​

static char host_block[HOST_TMP_36_BASE_BUF_LEN];

​

/******************************************************************************

 *                                                                            *

 * Purpose: modify string in-place to the specified length as required by     *

 *          CUID algorithm                                                    *

 *                                                                            *

 * Parameters:                                                                *

 *     input       - [IN/OUT] input string and result                         *

 *     input_alloc - [IN] buffer size where the input string is stored. It    *

 *                   should be larger than 'pad_size'.                        *

 *     pad_size    - [IN] target length                                       *

 *     fill_char   - [IN] character used to fill target string if there are   *

 *                   not enough existing characters                           *

 *                                                                            *

 ******************************************************************************/

static void pad(char *input, size_t input_alloc, size_t pad_size, char fill_char)

{

    size_t  input_len;

​

    if (pad_size == (input_len = strlen(input)))

        return;

​

    if (pad_size > input_len)   /* make string longer by prepending fill_char s */

    {

        if (pad_size + 1 > input_alloc || input_len + 1 > input_alloc)

        {

            THIS_SHOULD_NEVER_HAPPEN;

            return;

        }

​

        memmove(input + pad_size - input_len, input, input_len);

        memset(input, fill_char, pad_size - input_len);

    }

    else                /* make string shorter by keeping only last characters */

        memmove(input, input + input_len - pad_size, pad_size);

​

    input[pad_size] = '\0';

}

​

static char base36_digit(size_t num)

{

    if (num <= 9)

        return (char)(num + '0');

​

    return (char)(num - 10 + 'a');

}

​

static void str_rev(char *str)