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Posts Tagged ‘ubuntu’

f.lux screen temp adjustment

November 8, 2013 2 comments

It’s been a while since I have posted here, but I thought it best to pick it up again ūüôā

A few weeks ago I found this website that adjusts your screen temp to accommodate the time of day. Here is a quick description below:

f.lux fixes this: it makes the color of your computer’s display adapt to the time of day, warm at night and like sunlight during the day.

It’s even possible that you’re staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better.

Check it out @

http://justgetflux.com/

Just to clarify this does work on Ubuntu / Raring, I’ve also installed it to my Windows and random laptops around the home. When working ¬†late night, your eyes don’t feel like they are being burned out of your head from staring at the computer screen.

Try it out!

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Ubuntu 13.04 now available for the Google Nexus 7

December 7, 2012 Leave a comment

Hey All,

Nexus7 Running Raring 13.04

Today was the official announcement for the Nexus 7 supporting 13.04, for all you Nexus7 users that may have missed todays ubuntu meeting on Freenode.

This week we announced that the 13.04 build is available for download. New features include:

Added the oem installer, so no more preinstalled images!! Users can select their desired Language / Time Zone and Username

The ubuntu-installer-nexus7 was recently updated to rev 1.7 , this new version now flashes the 13.04 daily builds
For those of you that may not have the installer, you can go grab it @ https://launchpad.net/~ubuntu-nexus7/+archive/ubuntu-nexus7-installer

If some of you want to dist-upgrade from 12.10 -> 13.04 then you may hit some known issues.

Please refer to the following bugs:

http://pad.lv/1087295
http://pad.lv/1087335

These are the only bugs I found when dist-upgrading. We are urging everyone to re-flash if you don’t want to deal with the workarounds.

Serial Debug is a new feature that was recently added for 13.04, to enable and use, simply plug the usb cable into the Nexus7, connect to your computer and via a terminal type:

  • “screen /dev/ttyACM0 115200”

This should drop you into a login prompt. To kill, issue “ctrl-a k”

Refer to the wiki for more info @ https://wiki.ubuntu.com/Nexus7/

Enjoy!
-Sean

Categories: Linux Tags: , , , ,

Generating a clean MD5 Sum check file in python3

October 18, 2012 Leave a comment

This week I was stuck on a small problem involving me to generate hash sums for validation. Since I’ve been working on a automation project at work focusing on creating 100% hands free testing tools. A part of my test called for some basic procedures but I wanted to verify that the integrity of the data was sane. The original script that I was updating was written in Bash. Pretty much straight forward but yet, still room for improvement! ¬†I decided to revise the script and convert it over to python, doing so would also make a more powerful tool giving the versatility that python has over simple bash scripts. src and dst are 2 parameters that are called elsewhere in the script. Essentially they are strings pointing to a path on your hard disk, for example dst = “/tmp/blah/blah/”


def prepimage(src, dst):
    '''
    Obtain sample files
    '''
    filename = "%s/md5sum.txt" % (dst)
    md5path = "%s/" % (dst)
    print ("Copying data and Generating md5sums")
    if not os.path.exists(dst):
        shutil.copytree(src, dst)

    #Generate md5sums
        list = subprocess.check_output(["ls", dst],universal_newlines=True)
        plist = list.split('\n')[0:2]
        f = open(filename, "wt")
        for item in plist:
           out = subprocess.Popen(['md5sum', item], universal_newlines=True\
                 , stdout=subprocess.PIPE, cwd='%s' % dst).communicate()[0]
           f.write(out)
        f.close()
    return 0

Lines 7 – 9 are simply creating my directory if it doesn’t exist.

We start @ Line 12,

list = subprocess.check_output(["ls", dst],universal_newlines=True)
        plist = list.split('\n')[0:2]

Using subprocess.Popen we kick of an “ls” command. dst is an argument that we set earlier pointing to a random directory. This will now give us output of something like this:

‘How fast.ogg\nJosh Woodward – Swansong.ogg\nmd5sum.txt\n’

the 2nd line will split the string using the delimiter \n to give us:

[‘How fast.ogg’, ‘Josh Woodward – Swansong.ogg’]

Now using this list, we can create a new file as I do in 14 and kick off a for loop to run md5sum against each entry in the list and write the output to our new file. The final output will look just like this:

cat /tmp/optical-test/Ubuntu_Free_Culture_Showcase/md5sum.txt 6e34a2a0eaa61748ba3a33015a84e813 How fast.ogg c9459a907b9345b289ba6c9e6517d4c2 Josh Woodward – Swansong.ogg

On the flip side, you can automate the integrity check by creating a new function and adding:


#Verify md5checksum
checkoutput = subprocess.Popen(['md5sum', '-c', 'md5sum.txt']
, universal_newlines=True, stdout=subprocess.PIPE\
, cwd='/media/CDROM/').communicate()[0]

Which should output:

How fast.ogg: OK

Josh Woodward – Swansong.ogg: OK

 

—————————————————————————————–

Python 3 also makes use of hashlib to generate the hashsum.. If you don’t need a checksum file then heres some alternate code you can use!

import hashlib
...
...
filename = "/tmp/file1.txt"
...
file = open(filename, 'rb')
filedata = file.read()
file.close()
md5 = hashlib.md5()
md5.update(filedata)
md5sum = md5.hexdigest()
print (md5sum)

This would generate just the hashsums:

6e34a2a0eaa61748ba3a33015a84e813
c9459a907b9345b289ba6c9e6517d4c2

Connecting to an IRC server behind a firewall? I feel your pain!

September 29, 2012 Leave a comment

So I use Xchat¬†daily and connect to a private IRC server to talk with my colleagues. I also have a BIP server in the office to record all of the IRC transcripts, this way I never miss any conversations regardless of the time of day. Because the BIP server is behind a firewall on the companies network I can’t access it from the outside. ¬†For the past year I’ve been working around this by connecting to my companies firewall via ssh and creating a SOCKS tunnel then simply directing xchat to talk through my local SOCKS proxy.

To do this ,  open a terminal and issue:

ssh -CND <LOCAL_IP_ADDRESS>:<PORT> <USER>@<SSH HOST>

Ex: ssh -CND 192.168.1.44:9999 sfeole@companyfirewall.com

Starting ssh with -CND:

‘D’¬†Specifies a local ‚Äúdynamic‚ÄĚ application-level port forwarding. This works by allocating a socket to listen to port on the¬†local side, optionally bound to the specified bind_address. It also adds compression to the datastream ‘C’ and the ‘N’ is a safeguard which protects the user from executing remote commands.

192.168.1.44 is my  IPv4 address

9999 is the local port i’m going to open and direct traffic through

After the SSH tunnel is open I now need to launch xchat, navigate to Settings -> Preferences -> Network Setup and configure xchat to use my local IP (192.168.1.44) and local port (9999) then press OK then Reconnect.

I should now be able to connect to the IRC server behind the firewall. Usually I run through this process a few times a day, so it becomes somewhat of a tedious annoyance after a while.

Recently I finished a cool python3 script that does all of this in quick command.

The following code will do the following:

1.) identify the ipv4 address of the interface device you specify

2.) configure xchat.conf to use the new ipv4 address and port specified by the user

3.) open the ssh tunnel using the SSH -CND command from above

4.) launch xchat and connect to your server (assuming you have it set to auto connect)

To use it simply run

$./xchat.py -i <interface> -p <port>

ex: $./xchat.py -i wlan0 -p 9999

the user can select wlan0 or eth0 and of course their desired port. When your done with the tunnel simply issue <Ctrl-C> to kill it and wala!

https://code.launchpad.net/~sfeole/+junk/xchat

#!/usr/bin/env python3
#Sean Feole 2012,
#
#xchat proxy wrapper, for those of you that are constantly on the go:
#   --------------  What does it do? ------------------
# Creates a SSH Tunnel to Proxy through and updates your xchat config
# so that the user does not need to muddle with program settings

import signal
import shutil
import sys
import subprocess
import argparse
import re
import time

proxyhost = "myhost.company.com"
proxyuser = "sfeole"
localusername = "sfeole"

def get_net_info(interface):
    """
    Obtains your IPv4 address
    """

    myaddress = subprocess.getoutput("/sbin/ifconfig %s" % interface)\
                .split("\n")[1].split()[1][5:]
    if myaddress == "CAST":
        print ("Please Confirm that your Network Device is Configured")
        sys.exit()
    else:
        return (myaddress)

def configure_xchat_config(Proxy_ipaddress, Proxy_port):
    """
    Reads your current xchat.conf and creates a new one in /tmp
    """

    in_file = open("/home/%s/.xchat2/xchat.conf" % localusername, "r")
    output_file = open("/tmp/xchat.conf", "w")
    for line in in_file.readlines():
        line = re.sub(r'net_proxy_host.+', 'net_proxy_host = %s'
                 % Proxy_ipaddress, line)
        line = re.sub(r'net_proxy_port.+', 'net_proxy_port = %s'
                 % Proxy_port, line)
        output_file.write(line)
    output_file.close()
    in_file.close()
    shutil.copy("/tmp/xchat.conf", "/home/%s/.xchat2/xchat.conf"
                 % localusername)

def ssh_proxy(ProxyAddress, ProxyPort, ProxyUser, ProxyHost):
    """
    Create SSH Tunnel and Launch Xchat
    """

    ssh_address = "%s:%i" % (ProxyAddress, ProxyPort)
    user_string = "%s@%s" % (ProxyUser, ProxyHost)
    ssh_open = subprocess.Popen(["/usr/bin/ssh", "-CND", ssh_address,
                 user_string], stdout=subprocess.PIPE, stdin=subprocess.PIPE)

    time.sleep(1)
    print ("")
    print ("Kill this tunnel with Ctrl-C")
    time.sleep(2)
    subprocess.call("xchat")
    stat = ssh_open.poll()
    while stat is None:
        stat = ssh_open.poll()

def main():
    """
    Core Code
    """

    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--interface',
                        help="Select the interface you wish to use",
                        choices=['eth0', 'wlan0'],
                        required=True)
    parser.add_argument('-p', '--port',
                        help="Select the internal port you wish to bind to",
                        required=True, type=int)
    args = parser.parse_args()

    proxyip = (get_net_info("%s" % args.interface))
    configure_xchat_config(proxyip, args.port)
    print (proxyip, args.port, proxyuser, proxyhost)

    ssh_proxy(proxyip, args.port, proxyuser, proxyhost)

if __name__ == "__main__":
    sys.exit(main())

Refer to the launchpad address above for more info.

Simple Python3 Code to parse your ipaddress

September 27, 2012 Leave a comment

I’ve been doing some side projects on my own requiring me to obtain my assigned IPv4 address. ¬†In python3 you can do this by importing socket, which I believe is a better way than how I’m doing it below, however I found that using subprocess solved the issue!

I just put this together tonight and it does exactly what I wanted it to do. Feel free to copy and use it for your own little projects, you will need to add additional logic to the parser for additional network interfaces.

#!/usr/bin/env python3

import sys
import subprocess
import argparse

def get_net_info(interface):
    myaddress = subprocess.getoutput("/sbin/ifconfig %s" % interface)\
                .split("\n")[1].split()[1][5:]
    if myaddress == "CAST":
        print ("Please Confirm that your Network Device is Configured")
        sys.exit()
    else:
        return (myaddress)

def main():
#Parser Code
    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--interface',
                        help="Select the interface you wish to use",
                        choices=['eth0', 'wlan0'],
                        required=True)
    args = parser.parse_args()

#    print ("%s" % args.interface)
    print (get_net_info("%s" % args.interface))

if __name__ == "__main__":
    sys.exit(main())

Heres the expected output below, in the event the device in question is NOT configured (unplugged/unplumbed), the following should output:

sfeole@sfmadmax:~/pythonscript$ ./sean3.py -i eth0
Please Confirm that your Network Device is Configured

And here is the expected output when the device is configured(plugged in and plumbed)

sfeole@sfmadmax:~/pythonscript$ ./sean3.py -i wlan0
192.168.1.44

And of course , invalid arguements…

sfeole@sfmadmax:~/pythonscript$ ./sean3.py -i www
usage: sean3.py [-h] -i {eth0,wlan0}
sean3.py: error: argument -i/–interface: invalid choice: ‘www’ (choose from ‘eth0’, ‘wlan0’)

Ubuntu 12.10 Amazon Search, HOW TO REMOVE

September 24, 2012 1 comment

So it’s been quite a long time since my last post. Frankly I’ve been busy with work/personal life, spending time with my little girl and catching up on random chores in and out of the house. Everyone can relate I’m sure.

Well , so new info!! Some of you know that Ubuntu 12.10 Quantal Quetzal release is right around the corner. I’ve been using it since Beta1 and I have to say it’s coming along nicely. A new feature that has some users in an uproar is the Amazon Search feature in Dash. Whenever searching for new items using the Search Lens the system will now poll results from Amazon.com.

Here’s an example:

I search for Music and note the results from Amazon which populate in as I wait…

To Remove this, Open a Terminal Window <Ctrl-Alt-T>

$sudo apt-get remove unity-lens-shopping

Logout and LogBack then search for MUSIC again

All Fixed.

Hope this helps!! and Enjoy the new 12.10 Features!<

How to backup all my Windows pics to the Linux box

March 25, 2012 Leave a comment

So if your like me, then you shoot RAW!¬† I use Adobe Photoshop CS5 and Adobe Lightroom 3.5 for most of my post imaging which means my photography is mostly saved on a windows box. So there’s really no “play nice” backup solution. Plus I have about 20 some odd GB of photos which makes FTP out of the question.¬† What would be ideal is if they made rsync for windows….¬† Wait, they do!¬† Check it out here using Cygwin.

So assuming your using a file server like Ubuntu I’ll jot down some instructions so you can do this at home as well!

I’m already guessing that you have rsync installed on your linux box, if not that can be easily fixed by:

#sudo apt-get install rsync

  1. Create a file named rsyncd.conf in /etc
    1. #sudo vi /etc/rsyncd.conf
    2. Add the following to rsyncd.conf, replacing all instances of usernamewith your Ubuntu username:
      [usernamebackup]
      
          path = /home/username/backup
          comment = Backup
          uid = username
          gid = username
          read only = false
          auth users = username
          secrets file = /etc/rsyncd.secrets
    3. #sudo chmod 644 /etc/rsyncd.conf
  2. Create a file named rsyncd.secrets in /etc
    1. #sudo vi /etc/rsyncd.secrets
    2. Add the following to rsyncd.secrets, replacing username with your username and passwordwith a password of your choosing:
      username:password
    3. #sudo chmod 600 /etc/rsyncd.secrets
  3. Open rsync port by editing /etc/default/rsync and setting
    RSYNC_ENABLE=true
  4. Restart rsync
    #sudo /etc/init.d/rsync restart

Set up rsync client on Windows

  1. Install Cygwin, making sure  Net > rsync (3.0.8) and Net > openssh are selected
  2. Add C:\cygwin\bin;to the Windows PATH statement
    1. Right-click on My Computer and select Properties
    2. Switch to the Advanced tab and click the Environment Variables button at the bottom
    3. Find the ‚ÄúPath‚ÄĚ or ‚ÄúPATH‚ÄĚ variable in the System variables list at the bottom and click Edit
    4. Add C:\cygwin\bin; to the beginning of the list
  3. Create secret file to store password in Cygwin
      1. Start Cygwin Bash Shell
      2. Create secret file in the filesystem root and enter only the password in rsyncd.secrets above, with no spaces or line breaks
    #vi /secret
    #chmod 600 /secret
  4. Create bat file to run rsync
    1. Open Notepad and enter the following command, replacing User Name with your Windows User Name directory, username with your Ubuntu username, and ipaddress with the IP address of your Ubuntu server (e.g. 192.168.1.35):
      C:\cygwin\bin\rsync.exe --chmod u+rwx -qrtzv --password-file=/secret --delete "/cygdrive/d/photos" username@ipaddress::usernamebackup

      This will copy "/cygdrive/d/photos"  to the path specified in the rsyncd.conf. .

    2. Save the file as C:\rsync.bat

Now to simply kick off a backup just copy the batch file to your desktop and kick that off every time you finish your edits. You could also create a schedule task to execute the batch script daily @ midnight, I prefer to just run it manually as I don’t keep my linux box up or windows system 24/7