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Linux, programming and more

Create Nagios Icons

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Nagios

If you ever tried to make Nagios Status-Map a little nicer by adding some dependencies and some pretty icons, you have probably came across some little collections/packs of icons at NagiosExchange.
But if you need a special one, you must do it by yourself.
And you probably noticed that you need images with .gd2 extension
Here is how to convert a PNG image into .gd2 (GD Graphics Library format)

Solution one:

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aptitude install netpbm
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pngtopnm example.png | pnmtopng -transparent =rgb:00/00/00 2>/dev/null | pngtogd2 /proc/self/fd/0 example.gd2 0 1

Solution two:

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aptitude install libgd-tools
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pngtogd2 phone.png phone.gd2 0

Understanding FTP using commands

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FTP and SMTP are simple text based protocols, I show you how to get some files without a graphical FTP-Client.

Connect with Telnet:

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id@acer:~$ telnet debianuser.org 21
Connected to debianuser.org.
USER anonymous
PASS anonymous
PASV
RETR deli-0.8.0-core.iso

[Read more…]

Make your linux speaking

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Speaker

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echo 'you are a loser' | festival --tts
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for count in $(seq 1 10) ; do espeak "Go Away" ; done

Make speaker louder:

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amixer -c 0 sset Master,0 100%;
amixer set Master 100%
# or
amixer set PCM 100%

Another funny things:

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export DISPLAY=:0
xmessage 'YOU ARE BEING WATCHED. MUHAHAHAHahaha'

PHP Security

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PHP

PHP reveals its presence on the server in a variety of ways: It may send an HTTP header (X-Powered-By: PHP), or append its name and version to Apache’s signature. In addition, there are easter egg URLs that return the PHP logo or some PHP authors, one of them is:
http://www.host.com/index.php?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000

Obviously there is no reason to let end users know about the server’s PHP version. Luckily, there is a switch in php.ini that will disable all of the above:

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expose_php = Off

MySQL: Show processlist every second

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MySQL-Logo

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mysqladmin -u root -p -i 1 processlist

-u username
-p you will be promted for a password
-i 1 interval one second

Output will see like this one:

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+--------+------+-------------------+-----+---------+------+-------+------------------+
| Id     | User | Host              | db  | Command | Time | State | Info             |
+--------+------+-------------------+-----+---------+------+-------+------------------+
| 424111 | db4  | 192.168.2.1:58431 | db4 | Sleep   | 15   |       |                  |
| 424195 | db4  | 192.168.2.1:50531 | db4 | Sleep   | 1    |       |                  |
| 424483 | db3  | 192.168.2.1:41503 | db3 | Sleep   | 464  |       |                  |
| 424490 | db3  | 192.168.2.1:41513 | db3 | Sleep   | 443  |       |                  |
| 424551 | root | localhost         |     | Query   | 0    |       | show processlist |
+--------+------+-------------------+-----+---------+------+-------+------------------+