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Bug #27552 fwrite fails after writing 8k bytes
Submitted: 2004-03-10 11:39 UTC Modified: 2004-08-17 20:26 UTC
Votes:7
Avg. Score:5.0 ± 0.0
Reproduced:5 of 6 (83.3%)
Same Version:0 (0.0%)
Same OS:1 (20.0%)
From: jeroen dot pulles at redslider dot net Assigned: wez (profile)
Status: Closed Package: Sockets related
PHP Version: 5CVS-2004-03-10 (dev) OS: win32
Private report: No CVE-ID: None
View Developer Edit
 [2004-03-10 11:39 UTC] jeroen dot pulles at redslider dot net 
Description:
------------
When writing data to a socket, the program fails when writing more than 8192 bytes, irrespective of a given buffersize. 

Specifics:
- Windows 2000
- 5.0.0.0 RC1-dev (-200403101130)
- Command line interface (using cygwin)
- Almost no modules, just php_sockets.dll
- Default php.ini(-dist), apart from 
  E_ALL for the error logging

Note: 
The socket shouldn't be blocking, I didn't ask for it, and set_stream_blocking(true) doesn't change it; I'm guessing this is some irrelevant (for me) implementation detail for PHP.

Note: 
Writing to localhost does work.

Note:
Writing less than 8192 bytes does work (well, didn't check the exact size where failure starts to happen).

Note:
No problems on my Linux box and PHP 5.*.


Reproduce code:
---------------
<?php
    $socket = fsockopen('some-other-host', 80, $errno, $errmessage);
    $message_body = '';
    for ($i = 0; $i < 4000; $i++) $message_body .= 'yadda ';
    $contentlength = strlen($message_body);
    $message = "POST / HTTP/1.0\r\n";
    $message .= "Host: some-other-host\r\n";
    $message .= "Content-Type: text/plain\r\n";
    $message .= "Content-Length: $contentlength\r\n";
    $message .= "\r\n";
    $message .= $message_body;
    fwrite($socket, $message);
    fclose($socket);
    print($errmessage);
    print("Done\n");
?>

Expected result:
----------------
Expecting to just see "Done"

Actual result:
--------------
JeroenP@geneva$ bin/php fwrite-bug.php

Notice: fwrite(): send of 8192 bytes failed with errno=0 A non-blocking socket o
peration could not be completed immediately.
 in C:\home\wwwroot\aria\fwrite-bug.php on line 12
Done

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 [2004-03-10 12:06 UTC] wez@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5-win32-latest.zip

Please try a real windows binary, not a cygwin emulation and see if the problem persists.
 [2004-03-11 02:53 UTC] jeroen dot pulles at redslider dot net 
I am using the latest windows binary snapshot. 

(It's just that I'm not using the regular cmd.exe for command line work, but cygwin's bash.exe shell; Which is probably irrelevant anyway. For the record: I get the same result when running the reproduce code from cmd.exe.)
 [2004-04-07 06:03 UTC] sniper@php.net 
I can't reproduce this either. Are you sure there isn't some firewall or something in between that might somehow break this..?
 [2004-04-13 17:47 UTC] jeroen dot pulles at redslider dot net 
I am still experiencing the problem with 5.0.0.0 RC2-dev (April 12th windows snapshot).

I tried the code on two networks. One network has a transparent firewall as far as HTTP traffic is concerned. The other is my home network, behind a simple router/nat solution. I have no reason to believe anything is tampering the data; Especially since a smaller message body _does_ work. 

I put up a simple test case on my website:
http://www.redslider.net/test01/

I have no problem running fwrite_test.php with a small message size. However, the code still breaks when writing more than 8192 bytes. 

What I find weird is that the code runs fine, in any case, on a localhost webserver/website, but breaks on any remote host, irrespective of webserver software etcetera etcetera. I'm puzzled. 

Help is appreciated, 
jeroen
 [2004-07-21 12:57 UTC] ulf at haueisen dot net 
I experience the same with PHP 5.0.0 final on Windows Server 2003 using PEAR HTTP_Request while sending more than 8k POST-Data.
 [2004-07-21 13:48 UTC] ulf at haueisen dot net 
btw: It does work correctly with PHP 4.3.8.
 [2004-08-17 00:29 UTC] ulf at haueisen dot net 
I think this is a duplicate of 29256 and fixed in PHP 5.0.1

Thanks, 

Ulf.
 [2004-08-17 08:08 UTC] derick@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5-win32-latest.zip
 [2004-08-17 20:26 UTC] jeroen dot pulles at redslider dot net 
The problem seems to have disappeared; Just tested 
the reproduce code using 5.1.0-dev ('latest'), 
and it ran fine. 

Hoera! 
-- jeroen
 
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