from:"ik"

Hello,

I have a very complex queue management requirements, I need to calculate
task weight, time restrictions for execution, number of possible execution
at given time, changes of the data when it is inside the queue and even
disabling specific task.
some tasks have very short time to live, and required to be executed
faster, then others. but it's not a simple priority queue.

I'm looking for known algorithms for such tasks, such as bfs (at the
kernel) for example and more, and wonder if someone can point me to a list
or more resources to learn about queue management, and find the proper way
(or closer way) to implement my needs

Thanks
Ido
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Re: queue management algorithms

On Sun, Apr 7, 2013 at 2:39 PM, Orna Agmon Ben-Yehuda ladyp...@gmail.comwrote:

 If you are not in the kernel,


 Userspace all the way. Actually never touched the Kernel.

  

 you might with to consider slurm or the lesser ones ((open)PBS, torque),
 condor, boinc.
 If you need really complex things (dependencies), you need a scientific
 flow manager such as kepler.


Thanks, I'll take a look at them.

Ido




 On Sun, Apr 7, 2013 at 2:27 PM, ik ido...@gmail.com wrote:

 Hello,

 I have a very complex queue management requirements, I need to calculate
 task weight, time restrictions for execution, number of possible execution
 at given time, changes of the data when it is inside the queue and even
 disabling specific task.
 some tasks have very short time to live, and required to be executed
 faster, then others. but it's not a simple priority queue.

 I'm looking for known algorithms for such tasks, such as bfs (at the
 kernel) for example and more, and wonder if someone can point me to a list
 or more resources to learn about queue management, and find the proper way
 (or closer way) to implement my needs

 Thanks
 Ido

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Re: queue management algorithms

On Sun, Apr 7, 2013 at 3:51 PM, Oleg Goldshmidt p...@goldshmidt.org wrote:



 On Sun, Apr 7, 2013 at 2:27 PM, ik ido...@gmail.com wrote:

 Hello,

 I have a very complex queue management requirements, I need to calculate
 task weight, time restrictions for execution, number of possible execution
 at given time, changes of the data when it is inside the queue and even
 disabling specific task.
 some tasks have very short time to live, and required to be executed
 faster, then others. but it's not a simple priority queue.


 It is difficult to say from the description, but it sounds to me like your
 problem is that of scheduling rather than just queue management. Note
 that a scheduler (e.g., that of the kernel) will have many queues holding
 tasks of different types and properties, and will need to manage all of
 them together.

 In particular, some of the things you mention sound to me like real time
 requirements. If you look at, say, the Linux scheduler it handles RT tasks
 separately from the normal tasks. You may need to do the same.

 Another thing that is missing is the target system. A single server? A
 cluster or multicomputer? Something else?

 I'd suggest googling for scheduling and resource management (of which
 scheduling is a component). Apart from things like SLURM and Condor that
 Orna mentioned, maybe Maui? There are all sorts of proprietary offerings as
 well.


At first glance, condor looks like the thing that can help me most.

Thanks



 --
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Re: queue management algorithms

On Sun, Apr 7, 2013 at 6:36 PM, Orna Agmon Ben-Yehuda ladyp...@gmail.comwrote:

 If you are looking for something reliable for many tasks scheduled at a
 time (e.g., one user may send a hundred tasks within one second) go for
 slurm. openPBS, torque, condor cannot take the heat.  I heard that PBS (not
 open) can, too.


One of the issues, is knowing what data to take,  and there is a need for a
cycle. each cycle have finite number of data inside the queue, but each new
cycle recreate the queue to the actual content to be used.

I still research this one.




 On Sun, Apr 7, 2013 at 5:30 PM, ik ido...@gmail.com wrote:

 On Sun, Apr 7, 2013 at 3:51 PM, Oleg Goldshmidt p...@goldshmidt.orgwrote:



 On Sun, Apr 7, 2013 at 2:27 PM, ik ido...@gmail.com wrote:

 Hello,

 I have a very complex queue management requirements, I need to
 calculate task weight, time restrictions for execution, number of possible
 execution at given time, changes of the data when it is inside the queue
 and even disabling specific task.
 some tasks have very short time to live, and required to be executed
 faster, then others. but it's not a simple priority queue.


 It is difficult to say from the description, but it sounds to me like
 your problem is that of scheduling rather than just queue management.
 Note that a scheduler (e.g., that of the kernel) will have many queues
 holding tasks of different types and properties, and will need to manage
 all of them together.

 In particular, some of the things you mention sound to me like real
 time requirements. If you look at, say, the Linux scheduler it handles RT
 tasks separately from the normal tasks. You may need to do the same.

 Another thing that is missing is the target system. A single server? A
 cluster or multicomputer? Something else?

 I'd suggest googling for scheduling and resource management (of
 which scheduling is a component). Apart from things like SLURM and Condor
 that Orna mentioned, maybe Maui? There are all sorts of proprietary
 offerings as well.


 At first glance, condor looks like the thing that can help me most.

 Thanks



 --
 Oleg Goldshmidt | p...@goldshmidt.org



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Re: ix2-200 NAS and rsync

2013-01-24 Thread ik

On Mon, Jan 14, 2013 at 12:05 PM, Oleg Goldshmidt p...@goldshmidt.org wrote:
 On Sat, Jan 12, 2013 at 12:35 PM, ik ido...@gmail.com wrote:
 Hello,

 I have ix2-200 NAS, and I wish to start backpacking stuff using rsync,
 but I can't find out what path it uses for it.
 I created using web ui a directory named backup

 I tried
 rsync ... rsync@ip:~/backup/

 I get an error message that the directory was not found, I triend it
 as root directory, nothing, etc...

 I am not familiar with the device in question, so I am risking to fall
 face down into the mud. But if it is intended to be used as a NAS
 server, aren't you supposed to mount the target directory at a client
 system and rsync between the two local directories?

 Does the documentation say it supports the rsync protocol from a
 remote host? It is obviously possible that it does, but given that it
 does not support ssh... Come to think of it, if the remote path
 contains a single colon as in your example, ssh is used. have you
 tried  using the double colon to indicate that the raw rsync protocol
 should be used?

 rsync ... src/ ip::backup/

 etc?

You are correct, it took me a long time to understand it, and partly
using your replay.

Here is btw, a way to access the ssh part of the machine:
With older firmware:

http(s)://your ip/support.html

with newer firmware:

http(s)://your ip/diagnostics.html

using ssh:

user: root
pass: sohoYourAccessCode

that is, the access code you created for the web login, but adding a
prefix of soho

It runs Debian 5 on arm


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Re: ix2-200 NAS and rsync

2013-01-14 Thread ik

On Sat, Jan 12, 2013 at 11:33 PM, Amos Shapira amos.shap...@gmail.comwrote:

 The ~/ in ~/backup/ could be redundant, since your home directory is
 where the relative paths starts. Try removing it?


Tried that as well, but not avail :(



 Also a general tip about rsync - you should either use a trailing / on
 both source and destination paths or none, never mix unless you want the
 weird results that it causes.


Thanks

Ido




 On 12 January 2013 21:35, ik ido...@gmail.com wrote:

 Hello,

 I have ix2-200 NAS, and I wish to start backpacking stuff using rsync,
 but I can't find out what path it uses for it.
 I created using web ui a directory named backup

 I tried
 rsync ... rsync@ip:~/backup/

 I get an error message that the directory was not found, I triend it
 as root directory, nothing, etc...
 There is no ssh login, and I don't have time to start taking it apart
 and working on the hd themselves.

 So does anyone know how I can backup stuff using rsync ?

 Thanks,
 Ido

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Re: ix2-200 NAS and rsync

2013-01-14 Thread ik

On Mon, Jan 14, 2013 at 10:54 AM, Amos Shapira amos.shap...@gmail.comwrote:

 Can you use ssh protocol instead of raw rsync, even just to test?


Nop, it does not open TTY, so it closes for me when I try :(
According to Google, in order to make ssh work, I need to extract the two
hd, and mount them locally here, and change he configuration by hand.


 Can you reach the rsync daemon's configuration file (usually rsyncd.conf)?


 On 14 January 2013 19:43, ik ido...@gmail.com wrote:

 On Sat, Jan 12, 2013 at 11:33 PM, Amos Shapira amos.shap...@gmail.comwrote:

 The ~/ in ~/backup/ could be redundant, since your home directory is
 where the relative paths starts. Try removing it?


 Tried that as well, but not avail :(



 Also a general tip about rsync - you should either use a trailing / on
 both source and destination paths or none, never mix unless you want the
 weird results that it causes.


 Thanks

 Ido




 On 12 January 2013 21:35, ik ido...@gmail.com wrote:

 Hello,

 I have ix2-200 NAS, and I wish to start backpacking stuff using rsync,
 but I can't find out what path it uses for it.
 I created using web ui a directory named backup

 I tried
 rsync ... rsync@ip:~/backup/

 I get an error message that the directory was not found, I triend it
 as root directory, nothing, etc...
 There is no ssh login, and I don't have time to start taking it apart
 and working on the hd themselves.

 So does anyone know how I can backup stuff using rsync ?

 Thanks,
 Ido

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ix2-200 NAS and rsync

2013-01-12 Thread ik

Hello,

I have ix2-200 NAS, and I wish to start backpacking stuff using rsync,
but I can't find out what path it uses for it.
I created using web ui a directory named backup

I tried
rsync ... rsync@ip:~/backup/

I get an error message that the directory was not found, I triend it
as root directory, nothing, etc...
There is no ssh login, and I don't have time to start taking it apart
and working on the hd themselves.

So does anyone know how I can backup stuff using rsync ?

Thanks,
Ido

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Re: Fortigate router, and security attacks

2012-10-23 Thread ik

On Tue, Oct 23, 2012 at 7:14 PM, shimi linux...@shimi.net wrote:
 On Mon, Oct 22, 2012 at 11:13 AM, ik ido...@gmail.com wrote:

 Hello,

 I have a network with Fortigate router, active firewalls and the
 network itself is under NAT.
 It recently started to get attacked by external class A IP's (several
 of class A based IP blocks).
 We scan from outside, the network, the whole IP addresses of the
 network itself (that should go inside), and they are not visible from
 outside (except for a handful of IP addresses).
 The thing is, that they arrive to servers inside the network, and
 constantly try to attack them, scan them etc, while we see the
 external IP addresses of the attackers.

 The network contain Windows, Linux and Mac OS X machines (almost all
 of the desktops are Windows, and few Mac OS X).
 I'm looking for better ideas on what can be checked in that matter, to
 better understand from where they are coming from, or to figure out
 what is the vulnerability they are exploiting.



 If I'm reading you correctly - you're saying that internal IPs get
 connection attempts from the outside EVEN THOUGH they're not supposed to?
 (there's no NAT rule that sends an external IP to in internal one)?

You understand me correctly. There is no NAT rule that we know of that
provide such access.


 If so - are you sure they're _attacking_ you? Absolutely positive that what
 you're seeing is NOT returning packets for packets that have originated from
 YOUR network? (could be internal computers with malware...)

I see the automated scanners in the log, trying to do stuff,  but they
are very narrow cans for specific tasks of specific servers.
For example attempting to connect to SIP extensions on Asterisk and try to dial.



 The reason I'm asking, is, that for a new connection to be established to
 a machine behind NAT, you would need the NAT router to explicitly DNAT the
 traffic to the internal scope. If you didn't do that - it's very weird to
 see new sessions traversing the NAT router...

I know, that's why I'm so puzzled with it.


 However, if I am not reading you correctly, and you did open access to the
 internal network with DNAT rules, then I am not sure I understand what
 you're actually asking - it seems it works as expected? Please explain what
 do you mean by 'where they are coming from' - I think you already answered
 the question yourself (several of class A based...)

 So, please clarify the scenario more precisely. :)

 -- Shimi


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Fortigate router, and security attacks

2012-10-22 Thread ik

Hello,

I have a network with Fortigate router, active firewalls and the
network itself is under NAT.
It recently started to get attacked by external class A IP's (several
of class A based IP blocks).
We scan from outside, the network, the whole IP addresses of the
network itself (that should go inside), and they are not visible from
outside (except for a handful of IP addresses).
The thing is, that they arrive to servers inside the network, and
constantly try to attack them, scan them etc, while we see the
external IP addresses of the attackers.

The network contain Windows, Linux and Mac OS X machines (almost all
of the desktops are Windows, and few Mac OS X).
I'm looking for better ideas on what can be checked in that matter, to
better understand from where they are coming from, or to figure out
what is the vulnerability they are exploiting.

Thanks,
Ido

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qmail and mx records

2012-08-29 Thread ik

Hello,

I have a qmail (smtp) server . When there is a domain that only the MX
records provides the other side smtp servers, qmail does not check it,
and reports that it can not find any smtp servers.
Using simple telnet on such servers, they do answer properly.

I can't figure out how or what should be configured to make it check mx records.
I can only find how to set my own MX records for qmail, but not how to
make qmail look for the server it is sending.

Please note that I can not install postfix or exim, as normal smtp
servers, so I have to solve this issue with qmail

Thanks,
Ido

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Re: qmail and mx records

2012-08-29 Thread ik

Answering myself: There is a DNS problem at my server side, and not
the so called problematic server.

Ido

On Wed, Aug 29, 2012 at 3:12 PM, ik ido...@gmail.com wrote:
 Hello,

 I have a qmail (smtp) server . When there is a domain that only the MX
 records provides the other side smtp servers, qmail does not check it,
 and reports that it can not find any smtp servers.
 Using simple telnet on such servers, they do answer properly.

 I can't figure out how or what should be configured to make it check mx 
 records.
 I can only find how to set my own MX records for qmail, but not how to
 make qmail look for the server it is sending.

 Please note that I can not install postfix or exim, as normal smtp
 servers, so I have to solve this issue with qmail

 Thanks,
 Ido

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Re: alcatel X220

2012-07-29 Thread ik

On Sun, Jul 29, 2012 at 11:57 AM, Shimon Panfil i...@industrialphys.comwrote:


 Hi folks,
 does anybody have 1st hand experience with cellcom usb modem (alcatel
 x220) on linux? How hard should one work to make it work on e.g. centos 6.3?


It works well, I used with Orange:
http://idkn.wordpress.com/2010/11/19/connecting-cellular-modem-in-linux/


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Assisting a person to learn linux

2012-07-22 Thread ik

Hello list,

A person from Nazrat Iilit contacted me, and he is looking for a person
that could help him learn Linux.
He require that the person could be at the area, and also to communicate on
the phone, but less with texts.

At the moment, he installed Ubuntu 12.04, however he is unable to connect
into the network, or fully understand
how stuff works.

If there is such person that can help him, please contact me privately.

Thanks,
Ido
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Re: suggestions sought for a framework for a quick, dirty, reallysimple GUI prototype

2012-07-20 Thread ik

On Fri, Jul 20, 2012 at 1:21 PM, Dov Grobgeld dov.grobg...@gmail.comwrote:

 Here are a few comparisons. (Note that I always prefer inheriting the main
 window and thus create a derived widget. This typically requires more code,
 but in return you get a real widget that integrates seamlessly into the
 widget system.)

 Python gtk:

 #!/usr/bin/python

 import gtk

 class HelloWorld(gtk.Window):
 def button_clicked(self, data):
 print Hello World!

 def __init__(self):
 gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)

 self.connect(destroy, gtk.main_quit)

 button = gtk.Button(Press me)
 button.connect(clicked, self.button_clicked)
 button.show()
 self.add(button)

 HelloWorld().show()
 gtk.main()

 Vala:

 using Gtk;

 public class HelloWorld : Gtk.Window {
 construct {
 this.title = Hello World;
 var button = new Button.with_label(Hello world);
 button.clicked.connect( () = {
 stdout.printf(Hello world!\n);
 });

 button.show();
 this.add(button);
 }
 }

 int main(string[] args) {
 Gtk.init(ref args);

 var hello_world = new HelloWorld();
 hello_world.show();

 Gtk.main();
 return 0;
 }

 For pyside / PyQt see:

 http://www.harshj.com/2009/04/26/the-pyqt-intro/

 It carries some additional noise due to the python vs qt bindings.

 Regarding tcl, I once wrote a gtk/Tcl quick and dirty prototyping tool,
 that may be of interest to someone. See:

 http://gemshell.sourceforge.net/


Way too much code. In Lazarus you do not need to write this code, unless
you really want to.
Object Pascal is not a dynamic language but a static language, so you can
not compare the two.
Even TP was very complex language, and today's language contain even more
features, generics, mixin, and a lot more.

The API of both Lazarus and Delphi is very close to Qt (Qt came after
Delphi).
But today both with Lazarus and Delphi you can create native code and GUI
depends on the platform.
So you do not need to know GTK, Qt, WinAPI, Android API (yes you can
compile native code to run in JVM), iOS etc...
Except of specific stuff. You just use the API. when you compile to/in
windows it will be WinAPI native, no GTK or Qt.
On Linux, you can use GTK or Qt (in compile time you choose it).
On Mac it will be native to that, on BeOS it will native to BeOS etc..

Have a look at my program (not very simple one):
https://github.com/ik5/display-quotes

Only one method with some GUI code inside for an open dialog, that i did
not want to do in a design time. everything else is about the logic, not
about the GUI.
If you will check it closely, I even have code that that add extra features
if you compile it to GTK, and extra code for Windows based requirements,
only one line of code for it.

I binded there the libnotify library arrive from Gnome/GTK. You can see the
code itself.
When you use Python, you do not use GTK, you use a way that is suitable to
Python that at the end translate into GTK.
When you use Vala, it again translate into C that is translated into
machine code.
When you use Lazarus, you use API, that call the native UI methods (like
with Python), but translated into native machine code (elf, exe, class
files).

You have a lot of components and addons in Lazarus, and it is very simple
to write code with it that will work everywhere.
But people still think that working hard and dealing with too much
dependencies on run time for normal users, is the way to go,
and learning 10 technologies to write one program, is the proper way,
or that you do not need a fast executable (the fastest in bench-marking
then GCC, intel etc.. ),
then please, by all means, keep on going the wrong way ...

Just remember that C#, Go and even C11 copied from Object Pascal most of
it's features ...

My last battle in this thread on the subject.



 Regards,
 Dov


Ido


 On Thu, Jul 19, 2012 at 9:14 PM, Nadav Har'El n...@math.technion.ac.ilwrote:

 On Thu, Jul 19, 2012, Dov Grobgeld wrote about Re: suggestions sought
 for a framework for a quick, dirty, reallysimple GUI prototype:
  very nicely reflects the beauty of the GObject system. Especially in C
 it
  is easy to miss that because of the very tedious syntax you need to use,
  e.g. to define an derived class. In Vala the syntax is very concise.

 This is a very important point. This is why I loved Tcl/Tk when I
 learned it in the mid 90s - the code to create the gui was so compact,
 so elegant - the complete opposite of Xlib, Xaw and Motif, each
 requiring you to write dozens of lines for every simple task.

 For example, here is a program in TCL/TK which shows a hello button
 which outputs hi when pressed. How does it look in your favorite
 gui language?

 #!/usr/bin/wish
 button .a -text hello -command puts hi
 pack .a

 For the curious, the first command creates a button .a - in TK, widgets
 are hierarchical and have hierarchical

Re: suggestions sought for a framework for a quick, dirty, really simple GUI prototype

2012-07-19 Thread ik

On Wed, Jul 18, 2012 at 11:50 AM, Oleg Goldshmidt p...@goldshmidt.orgwrote:

 Hi,

 I have no - literally zero - experience in creating GUIs of any kind. I
 face the following task now: there is a C++ program that runs on Linux and
 basically receives some packets with some data over the network and does
 some transformations on the data. As a result some data structures are
 created and updated - potentially many times a second, say, a few times a
 second for any *single piece* of data. I need a *prototype* GUI that would
 display and constantly update (parts of) those structures, say strings and
 numbers with colours and labels and stuff. There may be a need for a
 drop-down menu for some configuration - don't know yet. Eventually maybe a
 button or two will be added to invoke some actions.

 I figure that the simplest way about it would be to make the GUI run on
 the same Linux machine and write it in C++ for ease of integration. What
 would be the easiest / simplest framework to use? Is it Qt? Ultimate++ (
 http://www.ultimatepp.org/ - just one of the things I found in a simple
 and brief search)? Since I have no experience it's difficult for me to
 judge quickly.

 What is important here is speed and painless ramp-up to some fairly low
 level. I want to be up and running as fast as possible with as little
 coding as possible. No need for bells and whistles. No need for long term
 maintenance. It is for a throw away demo/prototype - and yes, I am sure it
 (the GUI part) will be thrown away.

 Any suggestions / experiences / war stories / whatever?


I'm suggestion you a different type of approach here: Use Lazarus.
You do not need to worry about the GUI, because it's simple to use, you
only worry about the logic behind your solution.
It's not marketing, but how the concept works.

Here is an example on a project of mine using Lazarus:
https://github.com/ik5/display-quotes

The code there is not about writing GUI, but everything that is not the GUI
part.




 Thanks in advance,

 --
 Oleg Goldshmidt | p...@goldshmidt.org o...@goldshmidt.org


Ido


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Re: suggestions sought for a framework for a quick, dirty, reallysimple GUI prototype

2012-07-19 Thread ik

On Thu, Jul 19, 2012 at 12:40 PM, Dov Grobgeld dov.grobg...@gmail.comwrote:

 The advantage of using Qt or Gtk compared with some of the other gui
 toolkits mentioned (fltk, Tcl/Tk, SDL, or Matlab GUI) are that they are
 complete (lots of widgets, internationalization and localization support
 etc) if the prototype turns into something bigger than was initially
 envisioned. To often have I seen tools that were written like oh, its's
 only for me and then a company is trying to figure out how to deploy and
 support the tool. I therefore thing it is worth taking the time to learn
 complexity of one of these GUI's, and then use it.

 The language is a separate issue from the GUI. The difference between Qt
 and Gtk is that Qt was from the beginning written to be tighly coupled with
 C++, whereas gtk (actually the glib model) was written so that it is easy
 to bind it to various languages. There is even a special GObject (the base
 class of gtk) dedicated language. See:
 http://en.wikipedia.org/wiki/Vala_%28programming_language%29 . True,
 there are some bindings to Qt, e.g. the official python binding PySide, but
 the huge amount of bindings to gtk shows that it is a much easier task.

 In short, decide a language and a toolkit. Take time to learn it. It is
 well worth your time.


The thing is, that the approach I offered - Lazarus, contain support both
to Qt and GTK, but you do not care about it in any way, you just focus on
your task, on the libraries at hand. The libraries are only matter on
compile and deployment time, not on coding, you do not really use any GTK
or Qt code, but focus on an API that exists above this.

The fight aginst Qt vs GTK is nice when you need to focus yourself on
lower level development, not with tools that simplify things to you.
Vala, is a very stupid idea. it's a C# like language that is translated
into C and then built a native code.
With Lazarus, you program in a real programming language, and instead of
using a middleware, you just cod your code, and the GUI is designed without
any line of code (unless you have to, or just want to do it like that).



 Regards,
 Dov


Ido


 On Thu, Jul 19, 2012 at 12:29 PM, yochai yoc...@titat.info wrote:

 Shlomi,

 I gave it as an idea as I understood he doesn't need a full GUI or
 anything with a shiny look but to print a lot of data very fast.

 I'm sorry if I miss-understood anything.

 Yochai

 On 07/19/2012 12:12 PM, Shlomi Fish wrote:
  Hi all,
 
  On Thu, Jul 19, 2012 at 12:02 PM, yochai yoc...@titat.info wrote:
  Sorry, I thought it will be clear what I'm speaking about.
 
  https://en.wikipedia.org/wiki/Simple_DirectMedia_Layer
 
 
  I would recommend against SDL, because creating a decent GUI with it
  will require a lot of work, and on top of it will give you a giant
  window of raw graphics in the screen, which isn't very user-friendly
  or impressive. SDL is good enough for games, but not for a GUI
  application.
 
  There used to be a GUI library for SDL called ParaGUI but its home
  page is currently down. I'm not sure if it could fix all of SDL's
  limitations in regards to its usability as a GUI platform.
 
  Regards,
 
  -- Shlomi Fish
 
 
  On 07/19/2012 11:37 AM, Omer Zak wrote:
  On Thu, 2012-07-19 at 10:55 +0300, yochai wrote:
  Hey,
 
  It isn't the first idea that comes to mind but what about SDL ?
 
  How about giving an URL to a Website or a Wikipedia article, which
  describes the specific SDL that you refer to?
 
  When searching both resources, Google returned irrelevant links
  and Wikipedia was rather ambiguous.
 
  Thanks, --- Omer
 
 
 
 
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Re: suggestions sought for a framework for a quick, dirty, reallysimple GUI prototype

2012-07-19 Thread ik

On Thu, Jul 19, 2012 at 2:01 PM, Shlomi Fish shlo...@gmail.com wrote:

 Hi Ido,

 On Thu, Jul 19, 2012 at 12:50 PM, ik ido...@gmail.com wrote:
  On Thu, Jul 19, 2012 at 12:40 PM, Dov Grobgeld dov.grobg...@gmail.com
  wrote:
 
  The advantage of using Qt or Gtk compared with some of the other gui
  toolkits mentioned (fltk, Tcl/Tk, SDL, or Matlab GUI) are that they are
  complete (lots of widgets, internationalization and localization support
  etc) if the prototype turns into something bigger than was initially
  envisioned. To often have I seen tools that were written like oh, its's
  only for me and then a company is trying to figure out how to deploy
 and
  support the tool. I therefore thing it is worth taking the time to learn
  complexity of one of these GUI's, and then use it.
 
  The language is a separate issue from the GUI. The difference between Qt
  and Gtk is that Qt was from the beginning written to be tighly coupled
 with
  C++, whereas gtk (actually the glib model) was written so that it is
 easy to
  bind it to various languages. There is even a special GObject (the base
  class of gtk) dedicated language. See:
  http://en.wikipedia.org/wiki/Vala_%28programming_language%29 . True,
 there
  are some bindings to Qt, e.g. the official python binding PySide, but
 the
  huge amount of bindings to gtk shows that it is a much easier task.
 
  In short, decide a language and a toolkit. Take time to learn it. It is
  well worth your time.
 
 
  The thing is, that the approach I offered - Lazarus, contain support
 both to
  Qt and GTK, but you do not care about it in any way, you just focus on
 your
  task, on the libraries at hand. The libraries are only matter on compile
 and
  deployment time, not on coding, you do not really use any GTK or Qt code,
  but focus on an API that exists above this.

 The problem is that Lazarus is based on Free Pascal, which may have
 problem wrapping C++ code which is what Oleg wanted originally.


I might have misread it, but as I understand, he thinking on C++ because of
the GUI.



 
  The fight aginst Qt vs GTK is nice when you need to focus yourself on
  lower level development, not with tools that simplify things to you.

 Fight?


All other suggestions are either Qt vs GTK vs FLTK etc...
I offered to ignore the type of all of it.



  Vala, is a very stupid idea. it's a C# like language that is translated
 into
  C and then built a native code.

 Why is it a stupid idea? I recall re-implementing a small Perl program
 (which ran too slowly) in Vala, and it performed much better, so I was
 happy. I have not done any GUI programming in Vala, but translating
 something to C is a valid approach.


If what you understood is true, and he is looking for a C++ solutions, why
do you keep offering Python or Vala to him ?
If I understand it, then my solution is better, instead of using a language
to help use a toolkit, I offer a language with tools
that helps you develop GUI without the hassle of choosing the GUI toolkit,
but to focus on your work, and think in DRY land ...

If he choose Glade with GTK, he needs to start to think in grid like way of
writing.
If he chooses Qt with Qt-Develop, he will need to write a template, and
then focus on understanding Qt

I offer something different, different thinking, even know, without any
knowledge of gui development, or even the programming language,
a simple window, edit box, a button and a simple menu will take him less
then 10 minutes. When he'll know to use it, it will take him 3-5 minutes
tops.



  With Lazarus, you program in a real programming language, and instead of
  using a middleware, you just cod your code, and the GUI is designed
 without
  any line of code (unless you have to, or just want to do it like that).
 

 Are you implying that Vala is not a real programming language?


*Vala* is an object-oriented
http://en.wikipedia.org/wiki/Object-oriented programming
language http://en.wikipedia.org/wiki/Programming_language with a
self-hosting http://en.wikipedia.org/wiki/Self-hosting
compilerhttp://en.wikipedia.org/wiki/Compilerthat generates
C http://en.wikipedia.org/wiki/C_%28programming_language%29 code and uses
the GObject http://en.wikipedia.org/wiki/GObject system.  
http://en.wikipedia.org/wiki/Vala_%28programming_language%29

It's a descriptive language for C, that was built to help you develop GUI
for GTK, and looks too much like C# (it's actually cool language C#, much
better then Java, but that's off topic).



 Regards,

 -- Shlomi Fish

 --
 --
 Shlomi Fish http://www.shlomifish.org/

 Electrical Engineering studies. In the Technion. Been there. Done
 that. Forgot a lot. Remember too much.

 Please reply to list if it's a mailing list post - http://shlom.in/reply .

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Re: LDAP (Active Directory) and user statuses

2012-06-01 Thread ik

On Fri, Jun 1, 2012 at 4:41 PM, Baruch Shpirer bar...@shpirer.com wrote:

 You can run some syslog for windows daemon on your dcs and redirect to
 some linux syslog daemon and parse security events for login

 Last login record in the ldap will not help you much

 Baruch

 shimi linux...@shimi.net wrote:



 On May 31, 2012 6:14 PM, ik ido...@gmail.com wrote:
 
  Hello,
 
  I need to write an application (on Linux) that checks with Active
 Directory if a user is logged in, and few other details about that user.
  The only thing I do not understand, is how can I check if a user has
 logged in or not.
 
  Does anyone have any experience with this issue and can shed some light,
 or point me to a good documentation on the subject ?
 
  Thanks,
  Ido
 

 AFAIK, AD doesn't know a user is logged in, because AD is not a login
 service, rather than an information source (e.g. *can* you login or not
 with the credentials provided). Also, you may be logged in to multiple
 stations on the domain... which one is the important to you? How would it
 know?

 You need workstations/server level info, not AD, IMHO.

 For example you could query NetBIOS via nbtstat -A ipaddr from a remote
 windows machine... there should be samba equivalent (don't remember by
 heart, sending this from my sgs2)

 Hope this helps...


Thank you both, I'm thinking in forcing the DC to add me a property of
login with boolean field or something like that, because as I understand,
they do know if a user is logged in.
For me the number of logins is not important, only that they are logged in
somewhere.


 -- *Shimi*

Ido



 On May 31, 2012 6:14 PM, ik ido...@gmail.com wrote:

 Hello,

 I need to write an application (on Linux) that checks with Active
 Directory if a user is logged in, and few other details about that user.
 The only thing I do not understand, is how can I check if a user has
 logged in or not.

 Does anyone have any experience with this issue and can shed some light,
 or point me to a good documentation on the subject ?

 Thanks,
 Ido

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LDAP (Active Directory) and user statuses

2012-05-31 Thread ik

Hello,

I need to write an application (on Linux) that checks with Active Directory
if a user is logged in, and few other details about that user.
The only thing I do not understand, is how can I check if a user has logged
in or not.

Does anyone have any experience with this issue and can shed some light, or
point me to a good documentation on the subject ?

Thanks,
Ido
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HTTP IP spoofing detection

Hello,

I'm trying to detect a layer 7 based HTTP request, and see if it
contain headers that provided as spoofed IP address.
Is there a way to detect what is the Ethernet that the request arrived
from at apace level ?

If so, how can I provide rules what to do according to an HTTP header fields ?

Thanks,
Ido

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Re: HTTP IP spoofing detection

On Wed, Mar 14, 2012 at 13:30, shimi linux...@shimi.net wrote:

 On Wed, Mar 14, 2012 at 1:23 PM, ik ido...@gmail.com wrote:

 Hello,

 I'm trying to detect a layer 7 based HTTP request, and see if it
 contain headers that provided as spoofed IP address.
 Is there a way to detect what is the Ethernet that the request arrived
 from at apace level ?

 If so, how can I provide rules what to do according to an HTTP header
 fields ?


 You could look at the ARP cache by reading /proc/net/arp I guess.

 You ARE aware that Ethernet MACs, just like IPs, can be 'spoofed', right?

Yes, but it's not what I need to work upon.


 If your LAN is insecure, secure your LAN. Don't run web applications on
 unsecure networks...

My web app require to work also over the internet, and not only LAN
(client request), that's why I'm looking for a way to secure it
further.


 -- Shimi

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Re: HTTP IP spoofing detection

On Wed, Mar 14, 2012 at 16:28, Nadav Har'El n...@math.technion.ac.il wrote:
On Wed, Mar 14, 2012, ik wrote about HTTP IP spoofing detection:
Hello,

I'm trying to detect a layer 7 based HTTP request, and see if it
contain headers that provided as spoofed IP address.
Is there a way to detect what is the Ethernet that the request arrived
from at apace level ?

Generally, endpoints on the Internet will have a hard time spoofing
their IP address on connection-oriented protocols (like TCP-based HTTP
is) because while sending a packet with a false source IP is easy,
it's much more difficult to get back replies, when the victim sends them
to the falsfied IP address, which routers across the internet won't
route to the attacker.

TCP in particular protects again blind connection setup (where the
attacker cannot see replies) through its three-way handshake:
The attacker can send a SYN packet with a false source address,
and the server will reply to this false address with a SYN-ACK.
This server reply contains a server-chosen random initial sequence number.
The attacker will never receive this packet, so he'll not be able to
respond to it with its own ACK, as needed, and the connection will
NOT be established.

Anyway, if you really need to authenticate remote machines,
you should probably not do this based on their IP address, and rely on
more secure methods (e.g., SSL). Or at least don't allow the first packet
(an HTTP request) to do any damage.

Thank you, and everyone else for the answers.
It seems like I'm over thinking this issue.

I'll try to work on layer 3 instead.

--
Nadav Har'El | Wednesday, Mar 14 2012,
n...@math.technion.ac.il
|-
Phone +972-523-790466, ICQ 13349191 |A smart man always covers his ass. A wise
http://nadav.harel.org.il |man just keeps his pants on.

Ido

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Re: HTTP IP spoofing detection

On Wed, Mar 14, 2012 at 14:23, shimi linux...@shimi.net wrote:


 On Wed, Mar 14, 2012 at 2:02 PM, ik ido...@gmail.com wrote:

 On Wed, Mar 14, 2012 at 13:30, shimi linux...@shimi.net wrote:
 
  On Wed, Mar 14, 2012 at 1:23 PM, ik ido...@gmail.com wrote:
 
  Hello,
 
  I'm trying to detect a layer 7 based HTTP request, and see if it
  contain headers that provided as spoofed IP address.
  Is there a way to detect what is the Ethernet that the request arrived
  from at apace level ?
 
  If so, how can I provide rules what to do according to an HTTP header
  fields ?
 
 
  You could look at the ARP cache by reading /proc/net/arp I guess.
 
  You ARE aware that Ethernet MACs, just like IPs, can be 'spoofed',
  right?

 Yes, but it's not what I need to work upon.

 
  If your LAN is insecure, secure your LAN. Don't run web applications on
  unsecure networks...

 My web app require to work also over the internet, and not only LAN
 (client request), that's why I'm looking for a way to secure it
 further.


 I suspected that's going to be your reply...

 MAC is meaningless outside Layer 2.

 You can't do anything MAC related for clients outside your subnet. All
 Ethernet frames will arrive from the MAC of your router.

Yes, all I need is to use layer 2 or 3 (ebtables or iptables) and
allow only sources and destinations of a valid known mac addresses
(router, switch etc...)



 The way to secure a website over HTTP, for the last few decades, has been by
 using SSL, signed by a mutually trusted CA.

I can only use self signed certificate for this, but I'll try to use
SSL all the way.


 If you want to authenticate the clients, there's an option to request a
 client certificate during the SSL negotiation.

 -- Shimi


Ido

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elevate gdb privileges

2012-02-27 Thread ik

Hello,

I have a program that I write that uses user-space libraries that talk
with kernel space, and I use an IDE for the development and debugging.

The program requires to run as super user, but I do not want to run
the whole IDE itself as super user, only gdb for this specific
project, but the IDE
does not allow me to do something like: /usr/bin/kdesu /usr/bin/gdb ...
I also do not wish to provide suid to root, and allow every one to use
gdb as root.

Beside executing gdb myself with sudo, how would you recommend me to
elevate user privileges for gdb on such case ?

Thanks,
Ido

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Re: elevate gdb privileges

2012-02-27 Thread ik

On Mon, Feb 27, 2012 at 12:43, guy keren guy.choo.ke...@gmail.com wrote:
 On 02/27/2012 12:33 PM, ik wrote:

 Hello,

 I have a program that I write that uses user-space libraries that talk
 with kernel space, and I use an IDE for the development and debugging.

 The program requires to run as super user, but I do not want to run
 the whole IDE itself as super user, only gdb for this specific
 project, but the IDE
 does not allow me to do something like: /usr/bin/kdesu /usr/bin/gdb ...
 I also do not wish to provide suid to root, and allow every one to use
 gdb as root.

 Beside executing gdb myself with sudo, how would you recommend me to
 elevate user privileges for gdb on such case ?


 a few options:


 1. write a program called gdb that only your user has access to. put it in
 your PATH before the locatinof the real gdb. this new gdb program will be
 a small suid C program that runs the real gdb. if your IDE looks for gdb in
 the path, rather then with a full path, it will work.

 2. make a second copy of the gdb binary that only your can access - and make
 it suid root. put it in your path before the original gdb.

 3. check if your IDE is able to use the gdb client-server model. if it can -
 you can run your program externally using the gdb server - and make your ide
 use a gdb-client. i didn't check if the gdb client can run as a normal user
 - but assuming the communiation is done over sockets - it can work. make
 sure that the socket is not accessible outside your machine, and you can add
 firewall rules that will only allow your user to connect to the relevant
 socket.

I'm going to use gdbserver. Thank you very much guys


 --guy


Ido


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Modern Linux memory management

2012-01-26 Thread ik

Hello,

In the past week I had several bugs that while gdb pointed to a place X,
the actual place was several instructions prior to that position.

For example the following error message I had to an off by one bug:
*** glibc detected *** ./test_parser: malloc(): memory corruption (fast):
0x01ddad50 ***

The instruction set that I was at, when glibc raised this exception was a
lot further then the original position of the function that caused it have
been executed.
Only by using valgrind, that I could find the exact location and figure
out, that it was another function that had the problem.

How does the modern memory management system is working then, that it takes
so much time for the problem to surface ?

Thanks,
Ido
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Re: Modern Linux memory management

2012-01-26 Thread ik

On Thu, Jan 26, 2012 at 18:08, Yedidyah Bar-David 
linux...@didi.bardavid.org wrote:

 On Thu, Jan 26, 2012 at 10:54:56AM -0500, Ori Berger wrote:
  On 01/26/2012 10:16 AM, Baruch Siach wrote:
 
  Only by using valgrind, that I could find the exact location and figure
  out, that it was another function that had the problem.
  
  How does the modern memory management system is working then, that it
 takes
  so much time for the problem to surface ?
  
  Now, if you corrupt the internal glibc data structure, glibc won't
 notice
  until you try to call one of malloc(), free(), etc.
 
  And in addition to what Baruch said:
 
  Valgrind will always catch these errors, but will result in
  significant slowdown (x10-x20). There are tools like DUMA (and its
  earlier incarnation, Electric Fence) incur almost no CPU overhead
  and can detect many kinds of corruptions as soon as they happen, by
  using the memory management units.
 
  (Because of the MMU granularity, you need to run your program twice
  - one in which allocations are aligned to the lower address, and one
  when they are aligned to the top address)
 
  There is also a middle ground; gcc's mudflap
  http://www.stlinux.com/devel/debug/mudflap and -- if your program
  is pure C and can be compiled by tcc,
  http://bellard.org/tcc/tcc-doc.html#SEC21; These are comparable to
  valgrind in functionality (for code you compile with them; standard
  library code runs at full speed/unchecked), but usually only
  introduce a small slowdown (10% or so).

 BTW, in case you do not know Fabric Bellard, he does lots of very cool
 stuff - he is the author of qemu, and every now and then I give a look
 at his site. I now did because of this post and found out an amazing
 project of a PC Emulator in Javascript:
 http://bellard.org/jslinux/
 The guy is simply amazing.
 --
 Didi


Thank you all, you made me wiser :)

Ido



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Re: Israeli Linux Friendly Compatibility List?

2011-11-20 Thread ik

2011/11/20 Amichai Rotman amic...@iglu.org.il

 Hello All,

 Is there a resource I could check for Israeli friendly Linux apps / sites?

 For instance: I'd like to use a personal finance program like KMoney, but
 customized to Israel (Hebrew interface, default settings for ILS, Israeli
 banks pre-installed and so on


I found Skrooge to be nice. Like the name suggest, it's for KDE (hence the
K :))

You can set each bank account for example (or any other resource) to be in
a specific currency, and even to set the default currency.
It also allow you to convert currency from one currency to another, but it
understand and does not allow you to convert the default currency to itself
:)

I did not look for Hebrew translation though.



 Thanks,

 Amichai.


Ido


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Detecting runaway process

Hello list,

I have a daemon that every X amount of time just stop running. There are no
logs or any other indicator for what will make it stop running, but it does.
I'm looking for ideas on how to figure out what makes the daemon to stop
running.

Can you please help me with that ?

Thanks,

Ido
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Re: Detecting runaway process

On Thu, Nov 17, 2011 at 13:13, Shlomi Fish shlo...@shlomifish.org wrote:

 On Thu, 17 Nov 2011 03:03:39 -0800 (PST)
 Valery Reznic valery_rez...@yahoo.com wrote:

  You can try
  strace -p pid_of_daemon
 

 ik can also use gdb for that.


Can't use gdb, it's a Ruby daemon (I didn't wrote it).
And strace gives different outputs on each crash :(

I can't figure out what is wrong.



 Regards,

Shlomi Fish

 --
 -
 Shlomi Fish   http://www.shlomifish.org/
 Original Riddles - http://www.shlomifish.org/puzzles/

 rindolf buu: do you have a functional spec? An architecture document? An
 interface whitepaper? A developer’s guide? A user manual? A “The BL Book”
 and
 “BL — The Program”?
 buu rindolf: no, no, no no and no

 Please reply to list if it's a mailing list post - http://shlom.in/reply .

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Re: Detecting runaway process

On Thu, Nov 17, 2011 at 14:52, Evgeniy Ginzburg nad@gmail.com wrote:

 2011/11/17 ik ido...@gmail.com:
  Hello list,
 
  I have a daemon that every X amount of time just stop running. There are
 no
  logs or any other indicator for what will make it stop running, but it
 does.
  I'm looking for ideas on how to figure out what makes the daemon to stop
  running.
 
  Can you please help me with that ?

 And also it is useful to be specific then you asking question.
 Eg daemon, distribution, etc...
 http://catb.org/~esr/faqs/smart-questions.html


You must be new here. I'm known to be non smart person.
I usually choose tools that works for the task I require even when they are
not what everyone else chooses ...

Unlike forums, I can not edit it and add additional information that I'ved
missed, so I can send another email with additional information when  I
find out that I missed something out ...



 --
 So long, and thanks for all the fish.

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Re: Detecting runaway process

Solved it. Thank you for your help

Ido

On Thu, Nov 17, 2011 at 16:25, Nadav Har'El n...@math.technion.ac.il wrote:

 On Thu, Nov 17, 2011, ik wrote about Re: Detecting runaway process:
  Can't use gdb, it's a Ruby daemon (I didn't wrote it).
  And strace gives different outputs on each crash :(
 
  I can't figure out what is wrong.

 The first step is to figure out if it exits because of a signal (e.g.
 SIGSEGV) or because it decides to exit on its own. Try to run it in a
 shell prompt, not in the background, and see if you see any message when
 it ends, and see what the exit status ($?) is at the end of the run.

 While it is running, see if its memory use is growing out of control
 (use ps or top to find this out). Perhaps it uses too much memory and
 gets killed by the oom-killer.

 See if you see any relevant messages in /var/log/messages.

 Try with strace, what is the last few lines? Is there an exit() at the
 end?
 If it appears it just exists on its own accord, maybe this is not a bug,
 but a feature? :-) Look at the code and try to find any place it might
 exit without any message. In certain languages (I don't know about Ruby)
 it is possible for uncought exceptions to kill the program without a
 message - can it be the cause here too?

 Anyway, good luck.  In general, it's NOT FUN to debug a program that
 someone else wrote... There is no magic bullet, just sweat.


 --
 Nadav Har'El|  Thursday, Nov 17
 2011,
 n...@math.technion.ac.il
 |-
 Phone +972-523-790466, ICQ 13349191 |Isn't Disney World a people trap
 operated
 http://nadav.harel.org.il   |by a mouse?

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Re: Detecting runaway process