Tutorial Proggraming Free

tutorial - Block Messenger (AOL, Yahoo, MSN) services through Squid and Iptables

First of all you need to have a running copy of squid and you make transparent for your local
LAN. Add this to your squid.conf:

httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on

And this to your IPTABLES:

iptables -t nat -A PREROUTING -i eth1 -p tcp –dport 80 -j REDIRECT –to-port 3128
iptables -A OUTPUT -j ACCEPT -m state –state NEW,ESTABLISHED,RELATED
-o eth0 -p tcp –dport 80

…where eth0 is your external interface and eth1 your internal.

To block AOL IM and ICQ:
# iptables -A FORWARD –dport 5190 -j DROP
# iptables -A FORWARD -d login.oscar.aol.com -j DROP

To block MSN messenger:
# iptables -A FORWARD -p TCP –dport 1863 -j DROP
# iptables -A FORWARD -d 64.4.13.0/24 -j DROP

Kaaza Blocking
iptables -t nat -A POSTROUTING -s 150.100.16.0/255.255.240.0 -d ! 150.100.16.0/255.255.240.0 –dport 1214 –j DROP

Add following in squid.conf file

# Yahoo Messenger service
acl Yahoo-Mess dst 24.71.200.68/32 204.71.202.73/32 204.71.200.0/24
204.71.177.35/32 204.71.202.59/32 204.71.202.58/32 216.115.105.214/32
204.71.201.47/32 204.71.201.48/32 216.115.105.215/32
216.136.172.221/32 *.msg.yahoo.com
http_access deny Yahoo-Mess

# Trillian service
acl Trillian-Mess dst 66.216.70.167/32
http_access deny Trillian-Mess

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source:http://linuxpoison.blogspot.com/2008/06/135781758016149.html

tutorial - How to create a self signed certificates for Java Applets

1. Create your code for the applet as usual.

2. Install JDK and set the class-path/path

3. Generate key: keytool -genkey -keyalg rsa -alias key

Enter keystore password:
What is your first and last name?
[Unknown]: Nikesh
What is the name of your organizational unit?
[Unknown]: Cybage
What is the name of your organization?
[Unknown]: Cybage
What is the name of your City or Locality?
[Unknown]: Pune
What is the name of your State or Province?
[Unknown]: MH
What is the two-letter country code for this unit?
[Unknown]: IN
Is CN=Nikesh, OU=Cybage, O=Cybage, L=Pune, ST=MH, C=IN correct?
[no]: yes

(wait...)

Enter key password for
(RETURN if same as keystore password):
Re-enter new password:

(press [enter])

4. Export key: keytool -export -alias key -file cert.crt

Enter keystore password: *******
Certificate stored in file cert.crt

5. Create JAR: jar cvf applet.jar main.class
Add all classes used in your project by typing the classnames in the same line.

added manifest
adding: main.class(in = 671) (out= 460)(deflated 31%)

6. Verify JAR: jar tvf applet.jar

0 Fri Jun 20 17:51:38 IST 2008 META-INF/
68 Fri Jun 20 17:51:38 IST 2008 META-INF/MANIFEST.MF
671 Wed Jun 18 11:48:34 IST 2008 main.class

7. Sign JAR: jarsigner applet.jar key
Enter Passphrase for keystore:******

Warning:
The signer certificate will expire within six months.

8. Verifiy Signing: jarsigner -verify -verbose -certs applet.jar

131 Fri Jun 20 17:53:04 IST 2008 META-INF/MANIFEST.MF
252 Fri Jun 20 17:53:04 IST 2008 META-INF/KEY.SF
889 Fri Jun 20 17:53:04 IST 2008 META-INF/KEY.RSA
0 Fri Jun 20 17:51:38 IST 2008 META-INF/
smk 671 Wed Jun 18 11:48:34 IST 2008 main.class

X.509, CN=Nikesh, OU=Cybage, O=Cybage, L=Pune, ST=MH, C=IN (key)
[certificate will expire on 9/18/08 5:47 PM]

s = signature was verified
m = entry is listed in manifest
k = at least one certificate was found in keystore
i = at least one certificate was found in identity scope

jar verified.

Warning:
This jar contains entries whose signer certificate will expire within six months.

9. Create HTML-File for use of the Applet

source:http://linuxpoison.blogspot.com/2008/06/135781758016870.html

tutorial - Its time to upgrade from OpenSuse 10.x to OpenSuse 11.0

We hear that openSUSE 11.0 is just about to come out in some hours time, and it's high time to consider to go from a .2/.3 release to a .0 release? Well here are some main reasons why:

QT4 Installer:
Obviously the first thing you see when you upgrade / install an operating system is the installer screen. openSUSE 11.0 introduces a beautifully designed new QT 4 installer, that runs circles around any current Windows / Linux or Mac OX Installer (in terms of looks).

Package Management (Zypper):
Zypper has gone through MANY changes since it’s time in openSUSE 10.3. Currently 11.0 is running zypper 0.11.6-4.1, and package management is done so much smarter and faster (installing application, updating repo’s everything is much faster on openSUSE 11.0 then it was in previous versions).

Xorg:
Xorg has been updated to 7.3 (upgraded from 7.2 in openSUSE 10.3) and has many updates to Intel / Nvidia based xorg drivers. (if running Nvidia / ATI I recommend installing ATI / Nvidia proprietary drivers). Also note that AIGLX is enabled by default now.

Kernel:
openSUSE 11.0 ships with the pae kernel by default and is version 2.6.25 which has seen many improvements in virtualization, scheduling and obviously hardware support since 10.3’s release with 2.6.22.

KDE 3.5.9:
Has many improvements from KDE 3.5.7 which shipped with openSUSE 10.3. Many enhancements were done to PIM (Personal Identification Manager, ie Kmail, Kontact etc) along with many bugfixes since then.

KDE 4:
Although KDE 4.1 wasn’t released in time for openSUSE 11.0 you can upgrade to it using one of the openSUSE Build Services. With that said, openSUSE 11.0 ships with KDE 4.0.4 and will stay with that line for the life of the product. I honestly think it is on its way to being a very kick ass Desktop Environment, BUT, I just cannot afford to use it as my default DE on my production machines, since there are still some issues (mostly in plasma).

GNOME 2.22:
Pretty much enough said on that. GNOME 2.22 had many many improvements in everypart of GNOME, which can be found here:
http://library.gnome.org/misc/release-notes/2.22/

There are tons of other reasons and updates that have been done, that I haven’t captured in this quick blog. This is just to help steer the people on the grasps of “Should I upgrade or not” to just go ahead and do it. Many of the other notable updates are:

NetworkManager (although it still has a few issues with communication with YaST configurations)
OpenOffice (2.4.1).
Wine (1.0 rc by default but with the release of 1.0 today, I expect it to make the update repo).
Amarok (1.4.9.1)

If you feel I’ve missed something important please let me know and i’ll add.

The most important things though:
If you find a bug report it http://bugzilla.novell.com
This will help openSUSE mature more, and make 11.x be a great long lasting distribution.

source:http://linuxpoison.blogspot.com/2008/06/13578175806926.html

tutorial - GRE Tunneling How to

Lets say you have 2 networks that you want to connect to each other. These networks are both connected to the Internet.

So we have network A:

network 10.0.1.0
netmask 255.255.255.0
router 10.0.1.1
Internet 172.16.17.18

and network B:

network 10.0.2.0
netmask 255.255.255.0
router 10.0.2.1
Internet 172.19.20.21

On the router of network A, you do the following:

ip tunnel add B mode gre remote 172.19.20.21 local 172.16.17.18 ttl 255
ip addr add 10.0.1.1 dev B
ip link set B up
ip link set B mtu 1514
ip route add 10.0.2.0/24 dev B

let’s go on with the router of the network B

ip tunnel add A mode gre remote 172.16.17.18 local 172.19.20.21 ttl 255
ip addr add 10.0.2.1 dev A
ip link set A up
ip link set A mtu 1514
ip route add 10.0.1.0/24 dev A

If you want to delete the tunnel.

ip link set B down
ip tunnel del B

Of course, you can replace B with A for the A router

source:http://linuxpoison.blogspot.com/2008/06/135781758018502.html

tutorial - Squid Password Authentication Using NCSA

You can configure Squid to prompt users for a username and password. Squid comes with a program called ncsa_auth that reads any NCSA-compliant encrypted password file.

1) Create the password file. The name of the password file should be /etc/squid/squid_passwd, and you need to make sure that it’s universally readable.

# touch /etc/squid/squid_passwd
# chmod o+r /etc/squid/squid_passwd

2) Use the htpasswd program to add users to the password file. You can add users at anytime without having to restart Squid. In this case, you add a username called nikesh:

# htpasswd /etc/squid/squid_passwd nikeshNew
password:Re-type new password:
Adding password for user nikesh

3) Find your ncsa_auth file using the locate/find command. (different distro stores this file at different locations)

# locate ncsa_auth/usr/lib/squid/ncsa_auth

4) Edit squid.conf; specifically, you need to define the authentication program in squid.conf, which is in this case ncsa_auth. Next, create an ACL named ncsa_users with the REQUIRED keyword that forces Squid to use the NCSA auth_param method you defined previously. Finally, create an http_access entry that allows traffic that matches the ncsa_users ACL entry. Here’s a simple user authentication example; the order of the statements is important:

## Add this to the auth_param section of squid.conf

auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/squid_passwd

# Add this to the bottom of the ACL section of squid.conf
acl ncsa_users proxy_auth REQUIRED

# Add this at the top of the http_access section of squid.conf
http_access allow ncsa_users

Remember to restart Squid for the changes to take effect.

source:http://linuxpoison.blogspot.com/2008/06/13578175806726.html

tutorial - Check errors in NIC from command line

Errors are a common symptom of slow connectivity due to poor configuration or excessive bandwidth utilization. They should always be corrected whenever possible. Error rates in excess of 0.5% can result in noticeable sluggishness.

Ifconfig Error Output

wlan0 Link encap:Ethernet HWaddr 00:06:25:09:6A:D7
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:2924 errors:0 dropped:0 overruns:0 frame:0
TX packets:2287 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:180948 (176.7 Kb) TX bytes:166377 (162.4 Kb)
Interrupt:10 Memory:c88b5000-c88b6000

ethtool Error Output
The ethtool command can provide a much more detailed report when used with the -S switch.

[root@poison root]# ethtool -S eth0
NIC statistics:
rx_packets: 1669993
tx_packets: 627631
rx_bytes: 361714034
tx_bytes: 88228145
rx_errors: 0
tx_errors: 0
rx_dropped: 0
tx_dropped: 0
multicast: 0
collisions: 0
rx_length_errors: 0
rx_over_errors: 0
rx_crc_errors: 0
rx_frame_errors: 0
rx_fifo_errors: 0
rx_missed_errors: 0
tx_aborted_errors: 0
tx_carrier_errors: 0
tx_fifo_errors: 0
tx_heartbeat_errors: 0
tx_window_errors: 0
tx_deferred: 0
tx_single_collisions: 0
tx_multi_collisions: 0
tx_flow_control_pause: 0
rx_flow_control_pause: 0
rx_flow_control_unsupported: 0
tx_tco_packets: 0
rx_tco_packets: 0

Take a close look at errors sections in the above output

source:http://linuxpoison.blogspot.com/2008/06/13578175805975.html

tutorial - Things that will not work in OpenSuse 11.0

Xgl Versus AIGLX

On openSUSE 11.0 it is no longer possible to enable or disable Xgl with a graphical tool (such as gnome-xgl-settings in the past). Only the command line tool xgl-switch is still left to do this job. Instead AIGLX is now always enabled on supported hardware. There are still some issues with AIGLX (e.g., Xvideo is usually slower, OpenGL applications are misplaced when you rotate compiz' cube), but the majority of our customers are requesting to have AIGLX enabled by default. If you prefer Xgl over AIGLX use the command line tool xgl-switch to enable it:

xgl-switch --enable-xgl

If there are problems after enabling it (Xserver crashes, etc.) disable it again by running

xgl-switch --disable-xgl

The proprietary NVIDIA driver needs neither AIGLX nor Xgl for running with compositing managers as it provides its own framework. To enable Compiz, use "Desktop Effects (simple-ccsm)" application from the application menu.

Inode Size on the Ext3 Filesystem Increased

The inode size on the ext3 filesystem is increased from 128 to 256 by default. This change breaks many existing ext3 tools such as the windows tool EXTFS. If you depend on such tools, install openSUSE with the old value.

Press Ctrl-Alt-Backspace Twice to Terminate the X Server

Pressing Ctrl-Alt-Backspace on GNOME, KDE, or any other graphical desktop does not terminate the X server any longer. If you press Ctrl-Alt-Backspace within 2 seconds again, it terminates the X server. On most hardware you hear a beep after the first Ctrl-Alt-Backspace press.

source:http://linuxpoison.blogspot.com/2008/06/13578175802869.html

tutorial - Multimedia support in OpenSuse 11 (MP3, MPEG-4, DiVX, etc.)

If you are using KDE - Download and run (execute) this

If you are using Gnome - Download and execute this

Want VLC player - Download and run this

This will enable you to have:

Flash

Java

Latest Amarok (with MP3 Support) for KDE, or Helix-Banshee for GNOME users

Encrypted DVD (libdvdcss)

Extra XINE Codecs, for DivX/Xvid etc. (libxine1)

K3b with MP3 Support (k3b-codecs)

Win 32 Codecs (w32codec-all)

source:http://linuxpoison.blogspot.com/2008/06/13578175807437.html

tutorial - Check you Disk speed

Using some simple command you can check the performance of you hard disk, just execute following command…

# hdparm -tT /dev/hda

/dev/hda:
Timing cached reads: 732 MB in 2.00 seconds = 365.20 MB/sec
Timing buffered disk reads: 114 MB in 3.05 seconds = 37.38 MB/sec

Substitute /dev/hda with the name of your disk device.

source:http://linuxpoison.blogspot.com/2008/06/135781758019826.html

tutorial - How To do a quick Network Performance Test

If you want to do a simple and quick network performance test you can use the ftp command.

FTP on Linux and other Unix systems allows you to pass shell commands to the ftp client by using the pipe symbol ‘|’ as the first character of the file name. With this feature you can send a very large file to a remote host using /dev/zero as input and /dev/null as output.

Example:

ftp> put “|dd if=/dev/zero bs=1M count=100″ /dev/null

This command transfers a large file without involving the disk and without having to cache the file in memory. If you use a large file on a disk it might become a bottleneck. In this example, “|dd if=/dev/zero bs=1M count=100″ becomes the input file. Since a dd command without the “of=” paramater prints the content of the file to standard output (stdout), the ftp client can read the output and pass it on to the remote file which is /dev/null on the remote host.

source:http://linuxpoison.blogspot.com/2008/06/135781758015136.html

tutorial - Domain Masquerading in Sendmail

Suppose you have a domain (test.com) on which your sendmail is running and you want to send out the mails from this server with domain (other.com) — (This is a very simple example to doing spamming)

In such a scenario, sendmail can be configured to masquerade the domain name (From test.com to other.com), effectively.

Before changing the default sendmail configuration, the Sendmail Configuration Files and the M4 macro processor must be installed. M4 reads the sendmail.mc file and produces the sendmail.cf configuration file read by the sendmail application.

Next, we need to modify the sendmail.mc file, located in /etc/mail. We’re mainly concerned with the MASQUERADE_AS, masquerade_envelope and masquerade_entire_domain lines. These lines will be prefixed with delete through newline (dnl) statements. Delete dnl from the beginning of

dnl MASQUERADE_AS(`other.com’)
dnl, FEATURE(masquerade_envelope)
dnl and FEATURE(masquerade_entire_domain)

Change the MASQUERADE_AS line to reflect the domain name (other.com) that the from address should display (domain of outgoing mail).

Now any user which send the mail with address username@test.com will have username@other.com as a display name going out from this sendmail.

source:http://linuxpoison.blogspot.com/2008/06/13578175803604.html

tutorial - How to block/allow packets sent by specific Operating System with iptables?

There is an iptables module named OSF (passive OS Fingerprinting) that was written by Evgeniy Polyakov. This module allows passively detect OS packet was sent from and perform various netfilter actions based on this match. Packets with SYN bit set are analyzed.

In order to install OSF module, do the following:

1. Download latest release from here, for example as follows:
wget http://tservice.net.ru/~s0mbre/archive/osf/osf-2008_06_14.tar.gz

2. Edit Makefile from unpacked archive in order to set proper path to iptables headers (iptables.h and libiptc/ dir).

3. If your kernel sources can not be accessed via /lib/modules/$(shell uname -r)/build, you have to replace KDIR variable with the correct path to kernel sources.
4. Run make that should build ipt_osf.ko kernel module.
5. Run make lib that will build libipt_osf.so shared library (copy it to where all other iptables shared libs are placed in your distro e.g. /lib/iptables or /lib64/iptables in Fedora).

6. Run make bin that will build userspace applications which allows to load fingerprints and obtain information about matched packets (load, osfd, ucon_osf).

7. Download signatures list:
wget http://www.openbsd.org/cgi-bin/cvsweb/src/etc/pf.os

8. Install kernel module:
insmod ./ipt_osf.ko

9. Load signatures:
./load ./pf.os /proc/sys/net/ipv4/osf

10. Set up iptables rules allowing/disallowing packets generated by certain OS:
iptables -I INPUT -j ACCEPT -p tcp -m osf --genre Linux --log 0 --ttl 2

This example allows traffic from Linux systems and logs packets from other ones:
ipt_osf: Windows [2000:SP3:Windows XP Pro SP1, 2000 SP3]: 11.22.33.55:4024 -> 11.22.33.44:139

BTW, OSF has following options:

* --log
If present, OSF will log determined genres even if they don't match desired one.
0 - log all matched and unknown entries.
1 - only first one.
2 - log all matched entries.
* --ttl
0 - true ip and fingerprint TTL comparison. Works for LAN.
1 - check if ip TTL is less than fingerprint one. Works for global addresses.
2 - do not compare TTL at all. Allows to detect NMAP, but can produce false results.
* --connector
If present, OSF will log all events also through netlink connector(1.0 id).
More about connector can be found in Documentation/connector in kernel source tree.

[Thanks - http://www.linuxscrew.com/]

source:http://linuxpoison.blogspot.com/2008/06/135781758011033.html

tutorial - List of best Linux blogs

There are lots of blogs in this list which are dead or non-functional, so I have created a fresh list version 2 - you can find it here

If you got any blog which is worth mentioning here, do please let me know I will add it to the list.

Thanks
Author - Linuxpoison

UbuntuHQ Great site where you find a good collection of Ubuntu news, and posts, from other blogs.
ubuntublog Good Ubuntu blog, with lots of good Ubuntu stuff, sadly it stopped in September this year
PolishLinux This is a great Linux site, it has really good stuff, and great content
LinuxHelp Good site with great stuff, frequently updated.
UbuntuEssentials Frequently updated Ubuntu Site
Ubuntu-Unleashed Another good site with great stuff about Ubuntu Linux
HowToGeek Great How to site, not only for Linux but its Linux section is great!.
LinuxScrew good site which is coming real popular these days, with great articles.
Fsckin Frequently updated Linux site, great tutorials, and good posts about games for Linux.
ArsGeek Not only a Linux site, but with a great Linux section.
Ubuntu Geek All about Ubuntu, from a real Geek
BashCuresCancer Site devoted to command Line, unfortunately not too frequently updated
Phorolinux Really good tutorials about Linux.
http://www.linux-gamers.net/ For Linux games, how tos, forums, etc. about Video Cards, and Games.
http://www.madpenguin.org/cms/ Madpenguin, News, forums, about Linux
Ars Technica Open Ended section: http://arstechnica.com/journals/linux.ars
DesktopLinux: http://www.desktoplinux.com/
GNOME Footnotes: http://gnomedesktop.org/
Phoronix: http://www.phoronix.com/ (lots of good Linux stories)
http://www.debuntu.org Debuntu
http://tweako.com/section/ubuntu Tweako ubuntu
http://www.ubuntux.org Ubuntux
http://gaming.gwos.org Ubuntu Gamers Arena
http://freshubuntu.org/ Fresh ubuntu
http://www.markshuttleworth.com mark shuttleworth's blog
http://onlyubuntu.blogspot.com only ubuntu
http://ubuntuos.com ubuntu os
http://ubuntudemon.wordpress.com ubuntu demon
http://ubuntu.philipcasey.com ubuntu learner
http://xubuntu.wordpress.com xubuntu blog
http://www.ubustu.com/ the ubuntu feed
http://simplyubuntu.wordpress.com simply ubuntu
http://ubuntuliving.blogspot.com ubuntu living
http://allaboutubuntu.wordpress.com all about ubuntu
http://ubuntuheaven.blogspot.com ubuntu heaven
http://ubuntufan.wordpress.com ubuntu fan
http://ubuntulinux.or.id/blog/ id ubuntu blogs
http://ubuntology.com ubuntology
http://thedailyubuntu.blogspot.com/ the daily ubuntu
http://ubuntufs.wordpress.com ubuntu fs
http://ralph.n3rds.net ralph's ubuntu linux blog
http://www.ubufied.com ubufied
http://planet.gnome.org planet gnome [same as planet kde]
http://planetkde.org planet kde [links to TONS of other blogs]
http://happypenguin.org happy penguin linux gaming
http://www.nuxified.org nuxified
http://www.linuxreality.com linux reality podcasts
http://www.tuxmagazine.com tux online magazine
http://linux.byexamples.com linux by examples
http://www.fsckin.com fscking with linux
http://www.linux-watch.com linux watch
http://www.linuxtavern.com linux tavern
http://www.linuxwins.com linux wins
http://www.oreillynet.com oreilly network
http://linuxtracker.org linux tracker
http://lwn.net/ lwn
http://www.tuxme.com tuxme
http://pimpyourlinux.com pimp your linux
http://www.geekreviewed.com/ [geeky blog w/ linux category]
http://www.osdir.com os dir
http://blog.mandriva.com mandriva blog
http://kerneltrap.org kernel trap [linux kernel news]
http://www.linuxsecurity.com linux security news
http://fullcirclemagazine.org *buntu blog [3 major buntus]
http://boycottnovell.com boycottnovell
http://radio.linuxquestions.org linux questions
http://talkaboutlinux.com talk about linux
http://linuxondesktop.blogspot.com linux on desktop
http://www.jonobacon.org ubuntu/myth tv linux blog
http://kmandla.wordpress.com K.Mandla’s linux blog
http://joey.ubuntu-rocks.org/blog ubuntu rocks
http://fslog.com free software blog
http://thetuxproject.com the tux project
http://savvygeek.com savvy geek
http://bapoumba.wordpress.com a linux blog
http://linuxpoison.blogspot.com linux poison blog
http://lindesk.com
http://alinuxblog.wordpress.com

For Firefox wallpapers : here

source:http://linuxpoison.blogspot.com/2008/06/13578175805227.html

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