Denie's Tech Blog

You can use below simple PHP scripting to check IP address

<?php
if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){
echo “<title>”.$_SERVER["HTTP_X_FORWARDED_FOR"].” via “.$_SERVER["REMOTE_ADDR"].”</title>\n\n”;
echo “Your IP: “.$_SERVER["HTTP_X_FORWARDED_FOR"] . “<br />\n”;
echo “Proxy IP: “.$_SERVER["REMOTE_ADDR"] . “<br />\n”;
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}else{
echo “<title>”.$_SERVER["REMOTE_ADDR"].”</title>\n\n”;
echo “Your IP: “.$_SERVER["REMOTE_ADDR"] . “<br />\n”;
$ip = $_SERVER["REMOTE_ADDR"];
}
echo “Date Time: ” . date(”Y-m-d H:i:s”) . “<br />\n”;
?>

This information is ONLY relevant to PHP4 and Apache 1.3. (BUT possible can be work also in PHP 5.x and Apache 2.x ) We historically used PHP for all our web work. We have decided to migrate to ruby for lots of reasons for all our new web development but we still have lots of PHP stuff hanging around.

Background

We regularly mix PHP and SSIs for the following reasons:

• Laziness – we have a lot of historic SSI stuff lying around and do not want to change it. We prefer evolution to revolution.
• Appropriateness. Not all systems are good at everything. We find that conditionally selecting ‘lumps’ of code to deliver browser specific pages (see server side browser sniffing) is a lot cleaner and easier with SSI. That does not take away from either technology.

Nesting PHP and SSI

The rules go like this (PHP4 and Apache 1.3 – we understand that Apache 2 is more flexible but have not yet made the transition):

1. You can invoke SSI files from within PHP but must use the PHP virtual() function not include(). Variables set within PHP are NOT available to SSI so our favorite ‘wheeze’ of supplying last modified dates to a standard footer do not work.
2. You can include SSI files using the include virtual SSI directive but the SSI filename must have a .shtml extension even if the XBitHack is being used.
3. You cannot include PHP files using the include virtual SSI directive.
4. Variables set within the General Apache section (we use this technique for server side bowser sniffing) are available to both .php and .shtml files no matter how they are called.

Note: We would guess that the Apache environment for each type of file (.php and .shtml) is initialised to the same state as when the page is first called, whereas a nested .php files uses the same php environment and therefore reflects any dynamic changes.

Read more …

How to set PHP error notice hidden in httpd.conf (vhost):

<VirtualHost *:80>
  ...
  php_flag display_startup_errors off
  php_flag display_errors off
  php_flag html_errors off
  ...
</VirtualHost>

How to set individual php.ini in httpd.conf (vhost):

<VirtualHost *:80>
  ...
  PHPIniDir '/path/to/php/conf/php-foo.ini'
  ...
</VirtualHost>

How to set individual PHPError.log in httpd.conf (vhost):

<VirtualHost *:80>
  ...
  php_flag  log_errors on
  php_value error_log  /path/to/site/PHPerror.log
  ...
</VirtualHost>

Complete Information

/usr/bin/ld: cannot find -lltdl
collect2: ld returned 1 exit status

What you need to do, is just follow the below steps.

1. Verify that the libtool and libtool-ltdl packages are installed.
2. Symlink libltdl.so to libltdl.so.x.x.x

If libtool and libtool-ltdl already exist, you may go to Step Two.
Step One

[root@banzaibill ~]# yum install libtool-ltdl libtool

Now you have libtool installed. To check it out, do:

[root@banzaibill ~]# yum info libtool*

Step Two

PHP looks for the libltdl library only at /usr/lib/libltdl.so

The symlink to this file is not included in the libtool packages. Do below commands:

[root@banzaibill ~]# cd /usr/lib
[root@banzaibill lib]# ln -s libltdl.so.3.1.4 libltdl.so

And that’s it. PHP should configure and compile without error.

Just put below on your top line of the scripts :

$ips = array(”127.0.0.1″,”aaa.bbb.ccc”,”xxx.yyy.zzz”);
$userip = $_SERVER['REMOTE_ADDR'];
foreach ($ips as $ip) {
if (!preg_match(”/$ip/i”, $userip)) {
echo “Access Denied!”;
exit;
}
}

Notes:
$ips is the allowed IP address range

Other way, you can use .htaccess to protect directories/files.