Specify source port range with curl using PHP - php

Question

I need to specify the source port range for curl.
I don't see any option who let me choose a range for source port in TCP.
Is it possible?

Answer 1

You can use CURLOPT_LOCALPORT and CURLOPT_LOCALPORTRANGE options, which are similar to curl's --local-port command line option.
In the following example curl will try to use source port in range 6000-7000:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_LOCALPORT, 6000);
curl_setopt($ch, CURLOPT_LOCALPORTRANGE, 1000);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);
echo $result;
From the command line one would use:
curl --local-port 6000-7000 <url>
For documentation see: CURLOPT_LOCALPORT and Local port number.

Answer 2

I think it would be better using fsockopen. I came up many times this worked for me when blocked by firewalls. See: http://php.net/fsockopen
$ports = array(80, 81);
foreach ($ports as $port) {
$fp =# fsockopen("tcp://127.0.0.1", $port);
// or fsockopen("www.google.com", $port);
if ($fp) {
print "Port $port is open.\n";
fclose($fp);
} else {
print "Port $port is not open.\n";
}
}
By the way, there is CURLOPT_PORT for CURL, but doesn't work with tcp://127.0.0.1;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://127.0.0.1");
curl_setopt($ch, CURLOPT_PORT, 80);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$re = curl_exec($ch);
// echo curl_errno($ch);
curl_close($ch);
print $re;