ID: 42537
User updated by: sy at yalcin dot us
-Summary: fsockopen() hands due to slow firewall/dns response
Reported By: sy at yalcin dot us
-Status: Feedback
+Status: Open
Bug Type: URL related
Operating System: RHEL 4
PHP Version: 5.2.4
New Comment:
Ok, I will try using gdb to see. It may take a few days to give you
feedback.
Would strace dump work?
Previous Comments:
------------------------------------------------------------------------
[2007-09-04 09:57:36] [EMAIL PROTECTED]
Works fine for me. And there is a firewall also between my connection.
I think it's your DNS being slow..try debugging this using gdb to see
where it hangs.
------------------------------------------------------------------------
[2007-09-03 23:57:15] sy at yalcin dot us
Description:
------------
Firewall blocking or slowness in DNS causes fsockopen() hang, much more
than it should.This should return in 2 seconds. But it does not:
somedomain.localsite is not valid.
php -a
Interactive mode enabled
<?php
echo time()."\n";
$f = fsockopen('somedomain.localsite', 80, $tmp, $tmp, 2);
echo time()."\n";
var_dump($f);
1188857394
1188857426
bool(false)
Try with a unreachable IP, it returns as expected: (10.20.30.40 is not
valid)
php -a
Interactive mode enabled
<?php
echo time()."\n";
$f = fsockopen('10.20.30.40', 80, $tmp, $tmp, 2);
echo time()."\n";
var_dump($f);
1188857495
1188857497
bool(false)
This can be a firewall/dns issue. There is a very complicated firewall
installed here, which I don't know details yet.
It seems some packages are received, so that function does not time out
as expected. However it does not return because it waits for some other
packages.
Following is a google connection, it connects, but still not within 2
seconds. Socket handler is returned as if there is no delay!
php -a
Interactive mode enabled
<?php
echo time()."\n";
$f = fsockopen('www.google.com', 80, $tmp, $tmp, 2);
echo time()."\n";
var_dump($f);
1188857665
1188857681
resource(1) of type (stream)
Reproduce code:
---------------
Tested this with PHP 5.2.3 and does the same problem.
PHP is compiled with this:
./configure \
--with-config-file-path=/etc \
--enable-bcmath \
--with-bz2 \
--enable-calendar \
--enable-ftp \
--with-gettext \
--with-iconv \
--enable-mbstring=all \
--with-mysql \
--with-openssl \
--enable-sockets \
--enable-wddx \
--with-zlib \
--with-xmlrpc \
--enable-soap \
--enable-pcntl \
--enable-memory-limit \
--enable-force-cgi-redirect \
--disable-debug \
--enable-cgi \
--enable-fastcgi \
--enable-sysvsem \
--enable-sysvshm \
--enable-sysvmsg \
--enable-shmop \
--with-apxs2
Expected result:
----------------
I expect that fsockopen() will return back witin 2 seconds:
1) with FALSE return, means unsuccessful,
2) with a valid socket handler.
Any delay more than 2 seconds is not acceptable.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=42537&edit=1
