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Bug #2760 Failure to read from Windows sockets
Submitted: 1999-11-18 21:46 UTC Modified: 2002-06-16 09:00 UTC
From: pjones at ssc dot nmfs dot gov Assigned:
Status: Not a bug Package: Misbehaving function
PHP Version: 3.0.12 OS: Mandrake Linux 6.1
Private report: No CVE-ID: None
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From: pjones at ssc dot nmfs dot gov
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 [1999-11-18 21:46 UTC] pjones at ssc dot nmfs dot gov
We have php 3.0.12/apache running on a Mandrake Linux 6.1 server, attempting to communicate with a socket on a Windows NT 4.0 sp5 machine.  Write operations to the socket are successful, but reading back from the socket always blocks until timeout.

Here's what's supposed to happen:
1. PHP opens a socket to the Windows machine
2. PHP writes a string (a processing instruction to the app on Windows)
3. The app on Windows writes a reply back to PHP
4. PHP reads the reply into a variable, etc etc

Steps 1-3 work correctly.  However, php always fails to read back the reply from the Windows application using any number of approaches, such as:

function doTest(&$command) {
  $reply;
  $fp = fsockopen("marlin.ssc.nmfs.gov", 6692, &$errno, &$errstr, 30);
  if(!$fp) {
    return "Error opening socket.";
  } else {
    fputs($fp,$command);
    while ($buffer = fgets($fp, 128)) {
      $reply .= $buffer;
    }
    fclose($fp);
  }
  return $reply;
}

or replace the fgets with calls to fgetc, or any other piece of file-reading code.

Note the similarity to jisun66@hotmail.com's comment on the fgets manual page online, and the similarity to bug #2493.

FWIW, reading from the windows socket using a java program works without a hitch, so it does appear to be a php-specific problem.

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 [1999-11-19 19:43 UTC] danny at cvs dot php dot net
I had a similar problem where the NT App did not terminate 
the reply with a newline but with a ">" prompt character.

Replacing the fgets() with an fgtec() loop that stopped on 
detecting the terminating ">" promt solved the mystery. 
must a lot slower, but it worked.

I use PHP 3.013-dev though (compiled from CVS about a month 
ago).
 
Danny
---
 [2002-06-16 09:00 UTC] sander@php.net
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