#43695 [Com]: Asynchronous socket connection timing issue

ID: 43695 Comment by: rotoclapp at free dot fr Reported By: nicolas dot legland at free dot fr Status: Open Bug Type: Streams related Operating System: Windows XP Professional SP2 PHP Version: 5.3CVS-2007-12-28 (snap) New Comment: With Windows XP Stream ------ Open 0.092821 Wait 1.586471 Close 0.409261 read 0, write 0, except 1 Sockets ------- Open 0.002044 Wait 1.661001 Close 0.000029 read 0, write 0, except 1 Previous Comments: ------------------------------------------------------------------------ [2007-12-28 15:01:57] nicolas dot legland at free dot fr $ uname -imprs FreeBSD 6.2-STABLE i386 i386 GENERIC $ php -version PHP 5.2.4 with Suhosin-Patch 0.9.6.2 (cli) (built: Oct 17 2007 15:51:03) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies $ php -f socket.php Open 0.002772 Wait 0.166301 read 1, write 1, except 0 Close 0.000177 $ php -f stream.php Open 0.002527 Wait 0.166407 read 1, write 1, except 0 Close 0.000164 ------------------------------------------------------------------------ [2007-12-28 14:57:52] xrogaan at gmail dot com Works on linux ubuntu 7.10. Stream ------ $ php -f stream.php Open 0.033060 Wait 0.186314 read1, write 1, except0 Close 0.000088 Socket ------ $ php -f socket.php Open 0.017214 Wait 0.186275 read1, write 1, except0 Close 0.000077 $ php -v PHP 5.2.3-1ubuntu6.2 (cli) (built: Dec 3 2007 19:57:39) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies with Suhosin v0.9.20, Copyright (c) 2002-2006, by Hardened-PHP Project ------------------------------------------------------------------------ [2007-12-28 14:17:55] koollman at gmail dot com Works fine on linux, so it may be windows related: #socket example, edited to remove the dl() call $ php5 socket.php Open 0.002049 Wait 0.194022 read 1, write 1, except 0 Close 0.000044 #stream example $ php5 stream.php Open 0.007108 Wait 0.211123 read 1, write 1, except 0 Close 0.000048 #php5 from http://hype.sourceforge.jp $ php5 --version PHP 5.2.3-1~edh.0 (cli) (built: Jun 10 2007 11:07:12) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies #vanilla linux kernel $ uname -r 2.6.22 ------------------------------------------------------------------------ [2007-12-28 14:02:38] nicolas dot legland at free dot fr Description: ------------ When using sockets through the "sockets" extension, everything works fine with no delay to notice. Reproduce code: --------------- <?php // Load socket extension dl((('dll' === PHP_SHLIB_SUFFIX) ? 'php_' : '').'sockets.'.PHP_SHLIB_SUFFIX); // Send a [SYN] packet to scanme.nmap.org:70 $time = microtime(true); $resource = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_set_nonblock($resource); @socket_connect($resource, gethostbyname('scanme.nmap.org'), 70); echo 'Open '.number_format((microtime(true) - $time), 6).PHP_EOL; // Wait 3 seconds for a [SYN, ACK] packet $time = microtime(true); $read = $write = $except = array($resource); socket_select($read, $write, $except, 3); echo 'Wait '.number_format((microtime(true) - $time), 6).' read '.count($read).', write '.count($write).', except '.count($except).PHP_EOL; // Cancel connection $time = microtime(true); socket_close($resource); echo 'Close '.number_format((microtime(true) - $time), 6).PHP_EOL; ?> Result: ------- Open 0.030620 Wait 1.518440 read 0, write 0, except 1 Close 0.000108 ------------------------------------------------------------------------ [2007-12-28 08:37:12] nicolas dot legland at free dot fr Description: ------------ Asynchronously connecting a TCP socket stream to a filtered port times out, but closing the resource using fclose() blocks for 0.5 second. Asynchronously connecting a TCP socket stream to a closed port ends up with the server explicitly refusing the connection by a RST ACK packet. Using stream_select() returns the stream resource as having had an except but trying to close the resource using fclose() blocks for 0.5 second too. No network transfer was captured by Wireshark apart from the initial SYN packet in either case. Using fclose() on a successfully asynchronously connected TCP socket stream to an open port returns instantaneously. If you don't explicitly fclose() the resources of failed connections, the same 0.5 seconds lag appears at the end of the script execution for each one. PHP probably cleanly frees resources at shutdown, but it can reach several seconds when several sockets have failed. When using non-blocking BSD socket with the sockets extension, no delay of any kind is noticed. Reproduce code: --------------- <?php // Send a [SYN] packet to scanme.nmap.org:70 $time = microtime(true); $resource = stream_socket_client('tcp://'.gethostbyname('scanme.nmap.org').':70', $null = null, $null, 0, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT); stream_set_blocking($resource, 0); echo 'Open '.number_format((microtime(true) - $time), 6).PHP_EOL; // Wait 3 seconds for a [SYN, ACK] packet $time = microtime(true); $read = $write = $except = array($resource); stream_select($read, $write, $except, 3); echo 'Wait '.number_format((microtime(true) - $time), 6).' read '.count($read).', write '.count($write).', except '.count($except).PHP_EOL; // Cancel connection $time = microtime(true); fclose($resource); echo 'Close '.number_format((microtime(true) - $time), 6).PHP_EOL; ?> Expected result: ---------------- Open 0.010317 Wait 1.588449 read 0, write 0, except 1 Close 0.000099 Actual result: -------------- Open 0.010002 Wait 1.547396 read 0, write 0, except 1 Close 0.510161 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=43695&edit=1