Resolve hostname in PHP using different name server

Question

How I can resolve hostname to IP address using PHP, but using different nameserver (eg. OpenDNS or Google Public DNS).

It not seem that dns_get_record() or gethostbyname() are able to use a different nameserver than one currently set up on the system (in TCP/IP settings or in /etc/resolv.conf).

The only way I've found is using PEAR class Net/DNS, but it gives me lots of warnings under PHP 5.4

Is it an option to run a python script through exec and just read the shell output? I've seen this same problem solved in urllib2 on SO here:stackoverflow.com/questions/2236498/… — Mark Grey
– Mark Grey, Commented Jul 19, 2012 at 16:20
@DeaconDesperado: Why use a python script? If you can exec in PHP, why not just call the unix host command? exec('host google.com 8.8.8.8')? — gen_Eric
– gen_Eric, Commented Jul 19, 2012 at 18:07
@Rocket, just suggesting what I was familiar with, hence the comment rather than answer ;) — Mark Grey
– Mark Grey, Commented Jul 19, 2012 at 18:12
good choice, but I want it to be fast. exec() actually forks and uses pipes to redirects the stdin and stdout. This is quite costly operation and in my case will be waste of CPU resources. — Nick
– Nick, Commented Jul 19, 2012 at 18:44

gen_Eric · Accepted Answer · 2012-07-19 18:54:26Z

12

<?
require_once 'Net/DNS2.php';

$resolver = new Net_DNS2_Resolver( array('nameservers' => array('208.67.222.123')) );

$resp = $resolver->query("hooktube.com.", 'A');

print_r($resp);

echo $resp->answer[0]->address;

edited Jul 19, 2012 at 18:54

gen_Eric

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answered Jul 19, 2012 at 18:52

Nick

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3 Comments

jcarlosweb Over a year ago

It is possible if the IP of a visitor to my web. Whether the visitor uses the DNS to Google?

Nick Over a year ago

yes, but you do not need to use dns2 for this. apache /php gives you $_SERVER[REMOTE_ADDR] for this. If unsure - do print_r($_SERVER) or ask question about it.

jcarlosweb Over a year ago

Excuse me. To know if the visitor of my web using google public dns?

Sandman4 · Accepted Answer · 2012-07-19 16:50:26Z

8

Try net_dns2 (it's also in PEAR).

answered Jul 19, 2012 at 16:50

Sandman4

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3 Comments

Nick Over a year ago

looks promising, will give you feedback soon

Nick Over a year ago

require_once 'Net/DNS2.php'; $resolver = new Net_DNS2_Resolver( array('nameservers' => array('8.8.8.8')) ); $resp = $resolver->query("hooktube.com.", 'A'); print_r($resp); echo $resp->answer[0]->address;

a55 Over a year ago

https://netdns2.com/documentation/examples/

gen_Eric · Accepted Answer · 2012-07-19 18:32:10Z

8

If you are allowed to run shell scripts from your script, you can use the system's nslookup command.

$host = 'stackoverflow.com';
$dns = '8.8.8.8';  // Google Public DNS

$ip = `nslookup $host $dns`; // the backticks execute the command in the shell

$ips = array();
if(preg_match_all('/Address: ((?:\d{1,3}\.){3}\d{1,3})/', $ip, $match) > 0){
    $ips = $match[1];
}

print_r($ips);

Note: use escapeshellarg if $host and $dns are from user input.

edited Jul 19, 2012 at 18:32

answered Jul 19, 2012 at 18:26

gen_Eric

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4 Comments

gen_Eric Over a year ago

@jcarlosweb: I'm sorry, but I can't understand what you are asking.

jcarlosweb Over a year ago

Excuse me. To know if the visitor of my web using google public dns?

Nick Over a year ago

There is no way to detect this. Why you need such information anyway?

Svetoslav Marinov Over a year ago

I am getting these responses. Note that for yahoo it says: 'Addresses' C:\Users\User>nslookup slavi-2016-05-04.com 8.8.8.8 Server: google-public-dns-a.google.com Address: 8.8.8.8 *** google-public-dns-a.google.com can't find slavi-2016-05-04.com: Non-existent domain C:\Users\User>nslookup yahoo.com 8.8.8.8 Server: google-public-dns-a.google.com Address: 8.8.8.8 Non-authoritative answer: Name: yahoo.com Addresses: 2001:4998:58:c02::a9 2001:4998:c:a06::2:4008 2001:4998:44:204::a7 98.138.253.109 98.139.183.24 206.190.36.45

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