Kernel needs initramfs

When you recompile your kernel and you want to use initramfs remember to select this option:


General Setup --->
[*] Initial RAM filesystem and RAM disk (initramfs/initrd) support


And if you want to generate your initramfs with kernel-package in debian remember the option --initrd.

Rembember remember remember


for I in *.txt;do grep -H $(basename $I .txt) $I; done


You don't know why. But I assure you it's useful for me...

Imagemagick cropping 18Mb of png files

In these days I need to crop a lot of png file. They are screenshots of a desktop 1024x768 and I need to remove a frame around the main window. So I didn't want to use a program like gimp opening each file and crop it. So I thought to use a shell script with convert an utility from Imagemagick suite.
This is the code of the shell script:


for I in $(find -name *.png);do
convert -shave 0x46 -crop 1024x768+0+28 $I $I.crop
mv $I $I.old
mv $I.crop $I
done


Giving a GTK+ Interface to OCrypt.py using Glade

RCLUG invited Gianni Amato to LinuxDay2008 as speaker on Forensic Analysis with Linux. It is really nice to make Gianni’s acquaintance. He is really competent! Speaking with Gianni I discover that he wrote a nice python script to crypt/decrypt files called OCrypt.py. OCrypt.py has a GUI interface written in Tkinter. Gianni would like to write a GTK+ interface, but he hadn't much free time. So I offered to write a GTK+ interface for OCrypt.py using PyGtk and Python. Now, I recorded the creation of the interface with Glade using recordmydesktop.
There isn't my voice in these days I have a sore throat...



You can find updated glade file and the python script of OCrypt-gtk.py on my github.com repository.

DNS queries logging on WRT54GL

This morning I came up with another idea.
The last year I would try datamining on DNS data from my local dnsmasq.
But how could I collect all the queries of dnsmasq if it is installed on a WRT54GL without writing on the flash?
This morning I think, easy denever you could email the logs of dnsmasq on a dedicated gmail account.
So I looked for an smtp client on Kamikaze 7.09 which is installed on my WRT54GL:


root@openwrt:~# ipkg info *smtp*
Package: ssmtp
root@openwrt:~# ipkg install ssmtp


Taking a look there I could configure /etc/ssmtp.conf as follows:

root={your email acc name}@gmail.com
mailhub=smtp.gmail.com:465
rewriteDomain=gmail.com
hostname=gmail.com
FromLineOverride=YES
UseTLS=YES
AuthUser=your username
AuthPass=your password


And then how to log queries with dnsmasq?
Reading the documentation of dnsmasq I find:

The log-queries option tells dnsmasq to verbosely log the queries it is handling and causes SIGUSR1 to trigger a complete dump of the contents of the cache to the syslog.

So in /etc/dnsmasq.conf I added the following line

log-queries

But on Kamikaze 7.09 where dnsmasq writes the logs?
Dnsmasq uses syslogd for the logging.
Taking a look to /etc/init.d/boot you can find this:

syslogd -C16 ${log_ip:+-L -R $log_ip}

So how to read the logs? Easy we use the logread.
How could we email this logs? For this purpouse I wrote a script:

root@openwrt:~# cat /bin/print_dnslog.sh
echo -e "Subject: DNS Log\n"
logread | grep query


And then we could email everything, using another script:

root@openwrt:~# cat /bin/mail_dnslog.sh
/bin/print_dnslog.sh | ssmtp mybackup_mail@gmail.com

And then I want that mail_dnslog.sh running periodically so reading here and here I wrote a simple crontab.

root@openwrt:~# crontab -e
* * * * * /bin/mail_dnslog.sh


NSLU2 && lighttpd && esmtp

This morning I came up with an idea. How could I know when someone access to my lighttpd webserver installed on my NSLU2?

The answer is easy, denever, active mod_accesslog and then take a look to the access.log!

Ok, but if I want to reaceive a mail for each access? :)

Reading there, I discovered that it is possible to redirect the access.log to a process.

So I wrote this line in the /etc/lighttpd/lighttpd.conf on my NSLU2:

accesslog.filename = "| mail -i -s Webaccess my_email@anywhere.com"


The I installed and configured esmtp on my NSLU2:

apt-get install esmtp

Editing /etc/esmtprc:

hostname=smtp.googlemail.com
username=yourname@gmail.com
password=yourpass
starttls=enabled

But there is a problem: lighttpd write access.log only when is stopped...
So I shall not receive an email on each access on my webserver.
I will receive an email on each restart of lighttpd.

GMAIL + IMAP + MUTT

How to use our gmail account from console with mutt?

So this is how I configured mutt to access my gmail account via IMAP.

Open your ~/.muttrc and set the following options

If your user account on gmail is yourname@googlemail.com then set your folder as follow:


set folder = imaps://yourname@imap.googlemail.com
set imap_pass = yourpass

Notice...yourpass will be saved in clear text on ~/.muttrc.

Do you want to save your postponed mail (written with mutt) on gmail drafts? :)

Add in your ~/.muttrc the following row:


set postponed = "=[Google Mail]/Drafts"


And now, how to send email from mutt via smtp.googlemail.com?

As MTA I installed esmtp:

apt-get install esmtp


Then I configured mutt to use esmtp as MTA, adding in ~/.muttrc:

set sendmail = "esmtp -v -X ~/tmp/esmtp.log"


Then I configured esmpt editing /etc/esmtprc:

hostname=smtp.googlemail.com
username=yourname@gmail.com
password=yourpass
starttls=enabled

Notice that also /etc/esmtprc is a clear text, so yourpass would be read from root