Noyzi!!a’s Blog

DenyHosts - protect ssh from hackers

Posted in Linux by Noyzi!!a on the August 25th, 2007

What is DenyHosts?

DenyHosts is a script intended to be run by Linux system administrators to help thwart SSH server attacks (also known as dictionary based attacks and brute force attacks).

emerge denyhosts #

link :
http://gentoo-wiki.com/HOWTO_Protect_SSHD_with_DenyHosts
http://denyhosts.sourceforge.net

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CPU Usage Limiter for Linux

Posted in Linux by Noyzi!!a on the August 25th, 2007

cpulimit is a simple program that attempts to limit the cpu usage of a process (expressed in percentage, not in cpu time). This is useful to control batch jobs, when you don’t want they eat too much cpu. It does not act on the nice value or other scheduling priority stuff, but on the real cpu usage. Also, it is able to adapt itself to the overall system load, dynamically and quickly

Examples of use

Limiting the program ‘bigloop’ by executable name to 40% CPU:
$ ./cpulimit --exe bigloop --limit 40
or
$ ./cpulimit --path /usr/local/bin/bigloop --limit 40
Limiting a program by PID to 55% CPU:
$ ./cpulimit --pid 2960 --limit 55

link : http://cpulimit.sourceforge.net/

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iTALC - Intelligent Teaching And Learning with Computers

Posted in Linux by Noyzi!!a on the August 24th, 2007

iTALC is a use- and powerful didactical tool for teachers. supports Linux and Windows 2000/XP/Vista.

What is iTALC?

iTALC is a use- and powerful didactical tool for teachers. It lets you view and control other computers in your network in several ways. It supports Linux and Windows 2000/XP/Vista and it even can be used transparently in mixed environments!

In contrast to widely used commercial equivalent software, iTALC is free! This means you do not have to pay for expensive licenses or things like that. Furthermore the source-code is freely available and you’re free in changing the software to fit your needs as long as you respect the terms of iTALC’s license (GPL). Freedom in two ways!

Features

iTALC has been designed for usage in school. Therefore it offers a lot of possibilities to teachers, such as

see what’s going on in computer-labs by using overview mode and make snapshots
remote-control computers to support and help other people
show a demo (either in fullscreen or in a window) - the teacher’s screen is shown on all student’s computers in realtime
lock workstations for moving undivided attention to teacher
send text-messages to students
powering on/off and rebooting computers per remote
remote logon and logoff and remote execution of arbitrary commands/scripts
home-schooling - iTALC’s network-technology is not restricted to a subnet and therefore students at home can join lessons via VPN-connections just by installing iTALC client

Furthermore iTALC is optimized for usage on multi-core systems (by making heavy use of threads). No matter how many cores you have, iTALC can make use of all of them.
Some clients in overview-mode with opened welcome-screen

Some clients in overview-mode with opened Classroom-Manager

link : http://italc.sourceforge.net/

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ด้วย รักและหวังเหวิด

Posted in จับฉ่าย by Noyzi!!a on the August 24th, 2007

พ่อทำงานอาบ แดดถูกแผดเผา

ลูกดื่ม เหล้าฟังเพลงคลื้นเครงเหลือ

แม่ขายผัก กินข้าวเคล้ากับเกลือ

ลูกเอื้อ เฟื้อพาสาวเที่ยวเลี้ยวโฮเตล

พ่อหาเงิน ส่งลูกเรียนเพียรอุตส่าห์

ลูกติดยาคบ เพื่อนชั่วมั่วให้เห็น

แม่กระหาย ดื่มน้ำคลองตอนกลองเพล

ลูกทะเล้น จิบวายแดงแพงจับใจ

พ่ออดอยาก ไม่เคยบ่นทนลำบาก

ลูกมักมาก เพศสัมพันธ์มันชิบหาย

แม่ทอผ้า ปลูกหม่อนหารายได้

ลูกหญิงชาย เที่ยวสนุกโรคติดตัว

พ่อสูบน้ำ เข้าแปลงนาปลูกข้าวกล้า

ลูกมัวเมา การพนันหมั่นหาผัว

แม่หาบน้ำ เลี้ยงเป็ดไก่ทำสวนครัว

ลูกใจชั่ว ใช้เงินเพลินเดินหลงทาง

พ่อขายวัว ส่งควายเรียนเวียนศรีษะ

ลูกตะกะกิน ฟาสฟู๊ตพูดกว้างขวาง

แม่ปวด เมื่อยสู้งานหนักไม่ละวาง

ลูกสำอางใช้ ของแพงแข่งสังคม

พ่อผอมแห้ง เรื่ยวแรงน้อยด้อยอาหาร

ลูกประพฤติ อันตพาลล่าเสพสม

แม่เป็นดอก ทบต้นหมดอารมณ์

ลูกเขี้ยวคม ฆ่าพ่อแม่ก่อนแก่ตาย

ด้วย รักและหวังเหวิด . .

FW Mail มาจากเพื่อน อ่านแล้วน่าคิดนะ

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Which Transformer are you?

Posted in จับฉ่าย, me by Noyzi!!a on the August 21st, 2007

I AM
68%
OPTIMUS PRIME Take the Transformers Quiz

เจอมาจากบล๊อกพี่ veer -> plynoi

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Gentoo on my labtop Thinkpad X60

Posted in Gentoo, Linux by Noyzi!!a on the August 17th, 2007

/etc/make.conf

CFLAGS=”-march=prescott -O2 -pipe”
CXXFLAGS=”${CFLAGS}”
CHOST=”i686-pc-linux-gnu”
ACCEPT_KEYWORDS=”~x86″
MAKEOPTS=”-j3″
FEATURES=”ccache parallel-fetch”
GENTOO_MIRRORS=”http://mirrors.64hosting.com/pub/mirrors/gentoo/”
INPUT_DEVICES=”keyboard mouse”
ALSA_CARDS=”hda-intel”
VIDEO_CARDS=”i810 vesa”
LINGUAS=”th th_TH”
#http_proxy=”http://proxy.wu.ac.th:8080″
AUTOCLEAN=”yes”
USE=”-ipv6 -ldap aiglx apm pcmcia wifi”
USE=”$USE admin java java5″
USE=”$USE ”

source /usr/portage/local/layman/make.conf

/etc/modules.autoload.d/kernel-2.6

ieee80211_crypt
ieee80211
ipw3945

usbhid
uhci-hcd
ehci-hcd
ohci-hcd

thinkpad_ec
tp_smapi
hdaps

i915

create stage4 : from : http://gentoo-wiki.com/HOWTO_Custom_Stage4

#!/bin/bash
# Backup script for Gentoo Linux
# Author: Reto Glauser aka blinkeye
# Homepage: http://blinkeye.ch
# Mailto: stage4 at blinkeye dot ch
# Date: 23.03.2005
# If you need further infos check out this post: http://forums.gentoo.org/viewtopic.php?p=1751698#1751698

version=v1.2

# these are the commands we actually need for the backup
command_list=”echo tar hostname date split”

# verify that each command we use exists
for command in $command_list; do
	path=`which $command | grep “no $command in”`

	if [ ! -x `which $command` -a “$path” ]; then
		echo -e “nnERROR: $command not found! Check your commands and/or your $PATH”
		exit -1
	fi
done

# options for the tar command
tarOptions=”–create –absolute-names –preserve-permissions –totals –bzip2 –ignore-failed-read –verbose –file”

# where to put the stage4
stage4Location=/mnt/backups/stage4

# name prefix
stage4prefix=$(hostname)-stage4-`date +%d.%m.%Y`

# these files/directories are always excluded
default_exclude_list=”
–exclude=/tmp/*
–exclude=/var/tmp/*
–exclude=/lost+found/*
–exclude=/dev/*
–exclude=/proc/*
–exclude=/mnt/*
–exclude=/sys/*
–exclude=/usr/portage/*
–exclude=/var/log/*
–exclude=$stage4Location”

# depending on your choice these files or directories will additionally be excluded
custom_exclude_list=”
–exclude=/usr/src/*
–exclude=/opt/mathematica
–exclude=/usr/share/smssend
–exclude=/home/*”

# check the folder/files stored in $default_exclude_list exist
for exclude in $default_exclude_list; do
	if [ ! -e “`echo “$exclude” | cut -d’=’ -f2 | cut -d’*’ -f1`”  ]; then
		echo -e “nnERROR: `echo “$exclude” | cut -d’=’ -f2` not found! Check your $default_exclude_list”
	fi
done

# check the folder/files stored in $custom_exclude_list exist
for exclude in $custom_exclude_list; do
	if [ ! -e “`echo “$exclude” | cut -d’=’ -f2 | cut -d’*’ -f1`”  ]; then
		echo -e “nnERROR: `echo “$exclude” | cut -d’=’ -f2` not found! Check your $custom_exclude_list”
	fi
done

# print out the version
 echo -e “nBackup script $version”
 echo -e “===================”

# how do you want to backup?
echo -e “nWhat do you want to do? (Use CONTROL-C to abort)n
(1) Minimal backup
(2) Interactive backup”

while [ “$option” != ‘1′ -a “$option” != ‘2′  ]; do
	echo -en “nPlease enter your option: ”
	read option
done

case $option in
1)
	stage4Name=$stage4Location/$stage4prefix-minimal
	final_command=”tar $default_exclude_list $custom_exclude_list $tarOptions $stage4Name.tar.bz2 / /var/log/emerge.log”
	;;
2)
	for folder in $custom_exclude_list; do
		echo -en “Do you want to backup” `echo “$folder” | cut -d’=’ -f2`”? (y/n) ”
		read answer
		while [ “$answer” != ‘y’ -a “$answer” != ‘n’ ]; do
			echo “please enter y or n”
			read answer
		done
		if [ “$answer” == ‘n’ ]; then
			default_exclude_list=”$default_exclude_list $folder”
		fi
	done

	stage4Name=$stage4Location/$stage4prefix-custom
	final_command=”tar $default_exclude_list $tarOptions $stage4Name.tar.bz2 /  /var/log/emerge.log”
	;;
esac

# show what will be done
echo -e “n* creating the stage4 at $stage4Location with the following options:nn”$final_command

# everything is set, are you sure to continue?
echo -ne “nDo you want to continue? (y/n) ”
read answer
while [ “$answer” != ‘y’ ] && [ “$answer” != ‘n’ ]; do
			echo “please enter y or n”
			read answer
done

if [ “$answer” == ‘y’ ]; then
	# mount boot
	echo -e “n* mount boot”
	mount /boot >/dev/null 2>&1	

	# if necessary, create the stage4Location
	if [ ! -d “$stage4Location” ] ; then
		echo “* creating directory $stage4Location”
		mkdir -p $stage4Location
	fi

	# check whether the file already exists
	if [ -a “$stage4Name.tar.bz2″ ]; then
		echo -en “nDo you want to overwrite $stage4Name.tar.bz2? (y/n) ”
		read answer
		while [ “$answer” != ‘y’ ] && [ “$answer” != ‘n’ ]; do
			echo “please enter y or n”
			read answer
		done
		if [ “$answer” == ‘n’ ]; then
			echo -e “n* There’s nothing to do … Exiting”
			exit 0;
		fi
	fi

	# do the backup
	time $final_command

	# copy the current world file to the stage4 location
	echo -e “n* creating stage4 overview $stage4Name.txt”
	cp /var/lib/portage/world $stage4Name.txt >/dev/null 2>&1

	# we finished, clean up
	echo “* stage4 is done”
	echo “* umounting boot”
	umount /boot
else
	echo -e “n* There’s nothing to do … Exiting”
fi

#Uncomment the following command if you want to split the archive in cd size chunks:
#split –suffix-length=1 –bytes=670m $stage4Name.tar.bz2 “$stage4Name”.tar.bz2_ && echo “* splitting is done”