Fix display size on libvirt/Qemu guest

2017-05-22 2 min read Learning Vurtualization

Lot of times I find myself of VM that does not correctly resize the screen display and that is literally nuisance. So, here is quick and dirty fix for this.

First you need to find out information about your display with following command:

xrandr -q

And you will see output like this:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
Virtual-0 connected primary 1920×1080+0+0 0mm x 0mm
1024×768      59.92 +
1920×1200     59.88
1920×1080     59.96*
1600×1200     59.87
1680×1050     59.95
1400×1050     59.98
1280×1024     59.89
1440×900      59.89
1280×960      59.94
1280×854      59.89
1280×800      59.81
1280×720      59.86
1152×768      59.78
800×600       59.86
848×480       59.66
720×480       59.71
640×480       59.38
Virtual-1 disconnected
Virtual-2 disconnected
Virtual-3 disconnected
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Getting Started with Elixir Programming Language

2017-05-15 11 min read GuestPost Learning Uncategorized

If you have been reading blog posts, hacker news threads, your favorite developers tweets or listening to podcasts, at this point you’ve probably heard about the Elixir programming language. The language was created by José Valim, a well known developer in the open-source world. You may know him from the Ruby on Rails MVC framework or from devise and simple_form ruby gems him and his co-workers from the Plataformatec have been working on in the last few years.

Fix weird flux menu

2017-05-03 1 min read Learning Linux

Some distro’s just add all the items under single menu and thus the menu itself becomes unusable because of the number of items in the submenu and this I did not like and hence ceated this simply python script to fix that. For using the script, back up you “menu” file, redirect the output of this script to ‘menu’ file again.

#!/bin/python

F = open("~/.fluxbox/menu", "r")
count=0
mkc=1
started=0

for line in F:
    print line.rstrip()

    if '[submenu]' in line.lower() and started == 1:
        print '[end]'

    if '[end]'  in line.lower():
        count=0
        mkc=1
        if started > 0:
             started=0
             # print "Count is {}".format(count)
             # print "Started is {}".format(started)
             print '[end]'
    if '[exec]'  in line.lower():
        if count > 15 :
            if started > 0:
                started=0
                print '[end]'
                # print "Count is {}".format(count)
                # print "Started is {}".format(started)
            print '[submenu] ({})'.format(mkc)
            started=1
            mkc+=1
            count=0
        # print count
        count+=1

scapy packet dump to packet

2017-04-10 1 min read Learning

First you need to have scapy installed. And if you don’t know about scapy, then

Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery (it can replace hping, 85% of nmap, arpspoof, arp-sk, arping, tcpdump, tethereal, p0f, etc.). It also performs very well at a lot of other specific tasks that most other tools can’t handle, like sending invalid frames, injecting your own 802.11 frames, combining technics (VLAN hopping+ARP cache poisoning, VOIP decoding on WEP encrypted channel, …), etc
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Kernel dropped packet analysis

2017-02-27 1 min read Fedora Learning Linux

Found a simple method to check for all the packets dropped by kernel.

First you need to install dropwatch with

dnf install dropwatch

and details of the package

Name        : dropwatch

Arch        : x86_64

Epoch       : 0

Version     : 1.4

Release     : 13.fc24

Size        : 27 k

Repo        : fedora

Summary     : Kernel dropped packet monitor

URL         : http://fedorahosted.org/dropwatch

License     : GPLv2+

Description : dropwatch is an utility to interface to the kernel to monitor for dropped

network packets.

Get kernel function name from kernel address.

2017-02-13 1 min read Learning

If you are using pmap or using strace and want to covert kernel address to function name then you can use the following technique.

First you need to install elfutils, if not installed.

dnf install elfutils

and after this you can use the following command

eu-addr2line -f -e /boot/vmlinuz-$(uname -r) <addr>
#Example
eu-addr2line -f -e /boot/vmlinuz-$(uname -r) 00007f36a8045000

Compose a video from a text sequence

2017-01-23 1 min read Learning

I came across this useful and interesting project so sharing with all of you:

seq2vid

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