Posts Tagged ‘modern operating system’

xkill for Windows – Kill hanged programs with one click like in UNIX

Thursday, September 18th, 2014

Windows Xkill by Solo Dev logo kill easily hanged, crashed windows programs - Linux xkill for Windows alternative

I’ve used Linux as I’ve used it over the last 10 years and thus I’m so used to xkill that I consider it as a normal tool every modern operating system should have.

Since I’m forced to work on a Windows platform over the last 1 year, every now and then I have crashing / hanged apps Window which sometimes is hard to kill using Task Manager or command line tools like tasklist, taskkill or pstools – Windows Sysinternal tools cause you don’t know the exact process name of the Windows crashed application.

Thanksfully a good hearted guy SuprVillain made Windows Xkill program. Windows Xkill is portable app, so you don’t need to install it but simply download and run it.

windows-7-system-tray-xkill-screenshot-xkill-for-windows

Win-Xkill runs in system tray and has “kill mode” of operation, when Kill mode it is running Windowns Xkill operates exactly like UNIX’s xkill. The mouse pointer turns into Skull and Cross Bones, you point at a Window app you wanted to kill and it gets terminated.
Windows Xkill kill mode enabled killing a windows notepad app
Win Xkill kill mode, can be invoked using also a key press Control+Alt+Backspace as well as there is an option to leave xkill running in the background background, but disabling the tiny skull icon in systray from its interface.
Enjoy 🙂

How to make VPN PPTP (Point to Point Tunnel) Server on Debian Wheezy GNU / Linux

Thursday, September 5th, 2013

VPN pptp server linux debian logo

Creating VPN server for allowing users to connect is as early practice as the internet was used over Dial-Up modems. PPTP Connections were useful for separating user accounts traffic and easily keeping an eye on who connects to a server via phone line. Besides that VPN tunnels allows the user to connect to every possible running service locally on the server, meaning whether a user opens a VPN (PoPTOP) connection to the VPN server there is no need for port forwarding to local running server services.

Other advantages of plain VPN connection is it is a good way to grant access of Remote host not belonging to a network to have access to a distant local network using the internet as well as it is ultra easy to configure and use.
Even better PPTP is supported by virtually almost any modern operating system including all versions of Microsoft Windows.

As connection between client -> server is insecure and only password is transferred securily there is no complexity of SSL Certificate generation and Exchange like for instance whether configuring to use OpenVPN tunnel, IPsec or L2TP+IPsec.

Besides the many upmentioned advantages, there are some disadvantages of PPTP as it is unsecurely transferring data between VPN Client and VPN server.

After this short intro, here is how easy is to configure PPTP.

1. Install pptpd deb package

apt-get install pptpd

2. Edit /etc/pptpd.conf

vim /etc/pptpd.conf

Place near end of file:

localip 10.10.10.1
remoteip 10.0.10.2-250

localip variable sets local VPN server main IP and remoteip sets range of IPs in which VPN clients will be assigned IPs. As you see clients IPs will be assigned from;
10.0.10.2 to 10.0.10.250.

Some other reasonable values for localip and remoteip are:

localip 192.168.1.6
remoteip 192.168.1.150-183,192.168.1.244


As you see it is possible to set only a set of few ranges of IP in class C network to be assigned new IPs on connect to PPTPD server.


3. Modify /etc/ppp/pptpd-options configuration

ms-dns 8.8.8.8
ms-dns 8.8.4.4
nobsdcomp
noipx
mtu 1490
mru 1490

I prefer setting Google's Public DNS for VPN clients use (ms-dns 8.8.8.8 … etc.), as they are often more reliable than provided ones by ISPs, however others might be happier with custom ones as they might be quicker to resolve.

4. Edit chap-secrets to place client authentication usernames and passwords

File should look something like:

# Secrets for authentication using CHAP
# client           server         secret                          IP addresses
internet pptpd qwerty

For multiple VPN users just add all user usernames and passwords. If you want to assign certain username IPs from above pre-selected range put write it too.

5. Restart PPTPD server script

/etc/init.d/pptpd restart
Restarting PPTP:
Stopping PPTP: pptpd.
Starting PPTP Daemon pptpd.

By default PPTP server listens for network connections via port 1723. If server launches properly port 1723 should be listening for connections.

netstat -etna|grep -i 1723
tcp       0           0          0.0.0.0:1723                  0.0.0.0:*               LISTEN       0        32810

6. Enable VPN server access to all nodes on local network

Enabling PPTP Client to access the whole network is tricky and very bad security practice especially if VPN server is not behind DMZ. Anyways allowing a client to all local network computers is often needed. This is done via;

enabling IP Forwarding

To do so add in /etc/sysctl.conf

net.ipv4.ip_forward=1

i.e. exec:

echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf

sysctl -p

That's all now PPTP is ready to accept connections. I will not get into details how to configure VPN PPTP Connection from Windows host as this is an easy task and there are plenty of good tutorials online.
Cheers 😉

Unique MenuetOS – Free Software 32 / 64 bit OS entirely written in assembly language

Wednesday, July 10th, 2013

 

unique operating-system menuetos written-in-assembler-programming-logo

Something very unique, I stumbled on some time ago and worthy to mention and recommend for everyone to test is MenuetOS. Can you imagine, someone might write an operating system entirely from scratch in 32 / 64 bit Assemler? Idea sounds crazy and impossible but in fact developers of MenuetOS already achieved it!

Unique OS - menuetos asm free os start-menu screenshot

Normally every modern operating system nowadays is based on some kind of UNIX / Linux / or NT (Windows) technology or at least follows some kind of POSIX standartization.
 The design goal of MenuetOS since the first release in year 2000, is to remove the extra layers between different parts of an OS. The more the layers more complicated the programming behind is and therefore this creates bugs more bugs. MenuetOS follows the idea of KISS model (Keep It Simple Stupid). Its amazing what people can write in pure asm programming!! 64 bit version of menuet is also backward compatible with 32 bit. MenuetOS supports mostly all any other modern OS does. Here is list of Supported Features:

 

 

 

 

  • – Pre-emptive multitasking with 1000hz scheduler, multithreading, multiprocessor, ring-3 protection
  • – Responsive GUI with resolutions up to 1920×1080, 16 million colours
  • – Free-form, transparent and skinnable application windows, drag'n drop
  • – SMP multiprocessor support with currently up to 8 cpus
  • – IDE: Editor/Assembler for applications
  • – USB 2.0 HiSpeed Classes: Storage, Printer, Webcam Video and TV/Radio support
  • – USB 1.1 Keyboard and Mouse support
  • – TCP/IP stack with Loopback & Ethernet drivers
  • – Email/ftp/http/chess clients and ftp/mp3/http servers
  • – Hard real-time data fetch
  • – Fits on a single floppy, boots also from CD and USB drives

MenuetOS has fully functional Graphic interface (environment). Though it is so simple it is much more fast (as written in assembler) and behaves more stable than other OS-es written in C / C++.
Its bundled with a POP3 / Imap mail client soft

menuetos assmebly OS mail client
As of time even some major legendary Games like DoomQuake, Sokoban and Chess are ported to MenuetOS !!!

doom2-id-games-running-on-menuetos-operating-system-in-assembler-from-scratch

MenuetOS Doom

quake legendary game running on Menuetos asm free OS

Quake I port on MenuetOS

Below are some more screenshots of Apps and stuff running

Maniac Mansion running on MenuetOS assembler build free Operating system

The world famous Maniac Mansion (1987)

Prince of Persia running on 32 64 bit assembler written GPL free-OS

Arcade Classic of 16 bit and 8 bit computers Prince of Persia running on top of dosbox on MenuetOS

For those who like to program old school MenuetOS has BASIC compiler, C library (supports C programming), debuggers, Command Prompt.

It even supports Networking and has some  most popular network adapters drivers as well as has basic browsing support through HTTP application.

unique-os-menuetos-browsing-with-httpc-browser

You can listen music with CD Player but no support for mp3 yet.
To give MenuetOS a try just like any other Live Linux distribution it has Bootable LiveCD version – you can download it from here
MenuetOS is a very good for people interested to learn good 32 bit and 64 bit Assembler Programming.
Enjoy this unique ASM true hacker OS 😉