PHP Curl, retrieving Server IP Address - php

Question

I'm using PHP CURL to send a request to a server. What do I need to do so the response from server will include that server's IP address?

Answer 1

This can be done with curl, with the advantage of having no other network traffic besides the curl request/response. DNS requests are made by curl to get the ip addresses, which can be found in the verbose report. So:
Turn on CURLOPT_VERBOSE.
Direct CURLOPT_STDERR to a
"php://temp" stream wrapper resource.
Using preg_match_all(), parse the
resource's string content for the ip
address(es).
The responding server addresses will
be in the match array's zero-key
subarray.
The address of the server delivering
the content (assuming a successful
request) can be retrieved with
end(). Any intervening
servers' addresses will also be in
the subarray, in order.
Demo:
$url = 'http://google.com';
$wrapper = fopen('php://temp', 'r+');
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR, $wrapper);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);
$ips = get_curl_remote_ips($wrapper);
fclose($wrapper);
echo end($ips); // 208.69.36.231
function get_curl_remote_ips($fp)
{
rewind($fp);
$str = fread($fp, 8192);
$regex = '/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/';
if (preg_match_all($regex, $str, $matches)) {
return array_unique($matches[0]); // Array([0] => 74.125.45.100 [2] => 208.69.36.231)
} else {
return false;
}
}

Answer 2

I think you should be able to get the IP address from the server with:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://stackoverflow.com");
curl_exec($ch);
$ip = curl_getinfo($ch,CURLINFO_PRIMARY_IP);
curl_close($ch);
echo $ip; // 151.101.129.69

Answer 3

I don't think there is a way to get that IP address directly from curl.
But something like this could do the trick :
First, do the curl request, and use curl_getinfo to get the "real" URL that has been fetched -- this is because the first URL can redirect to another one, and you want the final one :
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.google.com/");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$content = curl_exec($ch);
$real_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
curl_close($ch);
var_dump($real_url); // http://www.google.fr/
Then, use parse_url to extract the "host" part from that final URL :
$host = parse_url($real_url, PHP_URL_HOST);
var_dump($host); // www.google.fr
And, finally, use gethostbyname to get the IP address that correspond to that host :
$ip = gethostbyname($host);
var_dump($ip); // 209.85.227.99
Well...
That's a solution ^^ It should work in most cases, I suppose -- though I'm not sure you would always get the "correct" result if there is some kind of load-balancing mecanism...

Answer 4

echo '<pre>';
print_r(gethostbynamel($host));
echo '</pre>';
That will give you all the IP addresses associated with the given host name.

Answer 5

AFAIK you can not 'force' the server to send you his IP address in the response. Why not look it up directly? (Check this question/answers for how to do that from php)

Answer 6

I used this one
<?
$hosts = gethostbynamel($hostname);
if (is_array($hosts)) {
echo "Host ".$hostname." resolves to:<br><br>";
foreach ($hosts as $ip) {
echo "IP: ".$ip."<br>";
}
} else {
echo "Host ".$hostname." is not tied to any IP.";
}
?>
from here: http://php.net/manual/en/function.gethostbynamel.php