Why do you need to call a socket 1000 times in order
to find out if a service is available or not?
-----Original Message-----
From: Sherry
To: php-windows@xxxxxxxxxxxxx
Sent: 8-5-2004 17:03
Subject: How to check port conection? socket_connect and fsockopen
have problems
Hi, I have Apache 1.3.29+PHP 4.3.6 on WinXP.
I need to check some services (ftp, http, smtp) on other machines for
availability.
--- Method 1 ---
So I try to use fsockopen:
$handle = fsockopen($ip, $port, $errno, $errstr, 5);
if ($handle) { close($handle); $online=1; } else {
$online=0; }
Everything looks fine, but there is one problem. Apache open 2 kind of
connections when I call fsockopen.
It looks in TCPView like:
apache.exe src_host:src_port host:0
LISTENING
apache.exe src_host:src_port dest_host:dest_port SYN_SENT
When 5 seconds timeout occurs, apache closes second connection, but
leave
first connection alive!
So, if I try to call fsockopen 1000 times, I got 1000 connections from
apache in LISTENING state!
Is there any ways to solve this problem?
--- Method 2 ---
When I try to use socket_connect, there is other problem appear.
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$exist = socket_connect($socket, $host, $port);
if ($exist) { socket_shutdown($socket); socket_close($socket);
$online=1; } else { $online=0; }
Socket_close works normally, but it leaves connection in TIME_WAIT
state.
This connections closes automaticaly when time_wait timeout occurs, but
this
timeout is very large! How I can make it smaller?
--- Method 3, etc? ---
Or may be there exist some other ways to check port and services for
availability???
With best regards,
Sherry.
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