[SOLVED] php ajax can't call binary in cgi-bin

dogpatch · 08-16-2017, 02:38 PM

This thread may belong to Linux-Server since it appears to be a server issue, but i think there must be someway i can change my php script to solve.

My linux / ngx hosting service recently 'upgraded' their hardware and software. Since they have done so, all php scripts trying to invoke a native linux binary in cgi-bin can no longer open or execute the binary. Here's the php code snippet:

Code:

$subprog = "sudcgif";
$url = "http://cyberjerry.com/cgi-bin/".$subprog;
$data = "?req=".$p_req."&all81=".$p_arg0;
$params = array('http' => array(
                'method' => 'post',
                'content' => $data
               ));
$ctx = stream_context_create($params);
$fp = @fopen($url, 'rb', false, $ctx);
if (!$fp) {
 print("Fatal error in ".$url.", ".$php_errormsg);
 exit(1);
 }

This has been working flawlessly for several years, now the fopen fails. I've changed nothing in the php script or binary, so the problem has to be the hosting service's recent upgrade.

When i asked what they've recently changed, their tech support said:
"were using a new php parser calle 'lsapi' and new hardware / cloud infrastructure."

What i'm specifically asking is whether something in my php code is obsolete and may have to change.

Any ideas?

NevemTeve · 08-16-2017, 02:43 PM

You should check file error_log. Or simply read the message your program prints.

dogpatch · 08-16-2017, 02:52 PM

I see nothing in the error log. My php code reports "Fatal error..." as seen in the above code snippet

This affects all of my several ajax calls to a binary executable, so i think the problem must be in the above code snippet. Pure php ajax appears to work ok. Some processes appear to execute when invoked directly, but fail when the above ajax code is used. So i presume the binary itself is working, or would, if the php script were able to invoke it

NevemTeve · 08-16-2017, 10:36 PM

http://php.net/manual/en/function.error-get-last.php

astrogeek · 08-17-2017, 01:40 AM

If you are not seeing any errors in the returned content, temporarily set PHP's error_reporting(...) to something more useful. If it is an ajax request then you need to look in your browser's javascript errors to see any returned error or hit the ajax target url in a separate tab.

sundialsvcs · 08-17-2017, 08:25 AM

Well, for one thing, in the snippet you posted, there is no code to define any value for the variable, $php_errormsg ...

dogpatch · 08-17-2017, 12:41 PM

All the above is moot, and i am inclined to mark this thread as 'solved', not because it is solved, but unsolvable, at least in any way that pertains to a programming thread. There are no errors reported by the server or php interpreter because according to the server nothing is amiss. What i believe has happened is that my hosting service has recently changed many server settings which i cannot alter, including the one which enables binaries in cgi-bin to be executed. Time to seek a better hosting service, no?