Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "dns.h"

#include "ip_reverse.h"

#include "../sysinfo.h"

​

#include "zbxsysinfo.h"

​

#include "zbxtime.h"

#include "zbxstr.h"

#include "zbxnum.h"

#include "zbxcomms.h"

#include "zbxalgo.h"

​

#if defined(_WINDOWS) || defined(__MINGW32__)

#   include <windns.h>

#   pragma comment(lib, "Dnsapi.lib") /* add the library for DnsQuery function */

#endif

​

#if defined(HAVE_RES_QUERY) || defined(_WINDOWS) || defined(__MINGW32__)

​

static const char   *decode_type(int q_type)

{

    static ZBX_THREAD_LOCAL char    buf[16];

​

    switch (q_type)

    {

        case T_A:

            return "A"; /* address */

        case T_AAAA:

            return "AAAA";  /* v6 address */

        case T_NS:

            return "NS";    /* name server */

        case T_MD:

            return "MD";    /* mail destination */      /* obsolete */

        case T_MF:

            return "MF";    /* mail forwarder */        /* obsolete */

        case T_CNAME:

            return "CNAME"; /* canonical name */

        case T_SOA:

            return "SOA";   /* start of authority */

        case T_MB:

            return "MB";    /* mailbox */           /* experimental */

        case T_MG:

            return "MG";    /* mail group member */     /* experimental */

        case T_MR:

            return "MR";    /* mail rename */       /* experimental */

        case T_NULL:

            return "NULL";  /* null */          /* obsolete */

        case T_WKS:

            return "WKS";   /* well-known service */    /* obsolete */

        case T_PTR:

            return "PTR";   /* domain name pointer */

        case T_HINFO:

            return "HINFO"; /* host information */

        case T_MINFO:

            return "MINFO"; /* mailbox information */   /* experimental */

        case T_MX:

            return "MX";    /* mail exchanger */

        case T_TXT:

            return "TXT";   /* text */

        case T_SRV:

            return "SRV";   /* service locator */

        default:

            zbx_snprintf(buf, sizeof(buf), "T_%d", q_type);

            return buf;

    }

}

​

#if !defined(_WINDOWS) && !defined(__MINGW32__)

static char *get_name(unsigned char *msg, unsigned char *msg_end, unsigned char **msg_ptr)

{

    int     res;

    static char buffer[MAX_STRING_LEN];

​

    if (-1 == (res = dn_expand(msg, msg_end, *msg_ptr, buffer, sizeof(buffer))))

        return NULL;

​

    *msg_ptr += res;