How to Connect Juniper Netscreen Device using Perl Scripts

The site http://search.cpan.org contains a usable and easy library to connect netscreen devices. Name of the library is Net::Telnet::Netscreen. Its use is straightforward:

#!/usr/bin/perl
use Net::Telnet ();
$t = new Net::Telnet (Timeout => 10,
                  Prompt => '/ns5gt-adsl->/');

$t->open("IP_ADDR_of_NetscreenDevice");
$t->login(netscreenUsername, Password);
 @lines = $t->cmd("get policy id X");
print @lines;
$t->cmd("exit");
$t->cmd("exit");

IP_ADDR_of_NetscreenDevice, netscreenUsername and Password expressions can be replaced with an address, an username and a password, respectively.

How to Connect Cisco Router with Perl Scripts

( Click for PHP version: http://stdioe.blogspot.com/2011/11/how-to-connect-cisco-router-with-php.html )

First of all, I have to explain how to configure the Cisco router for telnet connectivity. Because, the Cisco router supports the telnet password and privilege password, It also supports username and password combination for logging in. So there are two different type to logging in.

The following explanation of Cisco router configurations are from stratch. So we have to connect to router via console cable (rollover cable) and serial port on computer and terminal application. If you use MS Windows operating system, you can use Hyper terminal or different third party terminal applications. If you use Linux operating system, you have several choices. I usually use the minicom in my personel use laptop . But the problem is that It hasn't got any serial ports. The solution is to use the usb to serial converter adapter with requisite drivers installed in my Linux.

Router-A Configuration:

Router> Enable
Router# configure Terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# enable secret 0 cisco
Router(config)# line vty 0 4
Router(config-line)#login
% Login disabled on line 6, until 'password' is set
% Login disabled on line 7, until 'password' is set
% Login disabled on line 8, until 'password' is set
% Login disabled on line 9, until 'password' is set
% Login disabled on line 10, until 'password' is set
Router(config-line)#password cisco
00:00:54: %SYS-5-CONFIG_I: Configured from console by console
Router(config-line)# ^Z
Router#write memory

The following perl script to connect to Router-A without AAA;

#!/usr/bin/perl

use Net::Telnet::Cisco;
my $session = Net::Telnet::Cisco->new(Host => 'x.x.x.x');
$session->login('', 'password');

# Execute a command
my @output = $session->cmd('show version');
print @output;

# Enable mode
if ($session->enable("enable_password") ) {
@output = $session->cmd('show privilege');
print "My privileges: @output\n";
} else {
warn "Can't enable: " . $session->errmsg;
}

$session->close;

After than write this perl script above, of course you have to add execution permission to script file. For example, if the file name of this script is sample.pl then simply type

chmod +x sample.pl

Router-B Configuration (Updating to AAA model):

Router(config)#aaa new-model
Router(config)#username TelnetUser privilege 15 password 0 TelnetPassword

The following perl script to connect to Router-B;

The difference between the first sample and the second sample is that,
first router configuration is done with telnet password and password.

Anyway you can use the Net::Telnet::Cisco Library which is written in Perl. If you are using a Linux Distro, probably your package manager already contains it.

#!/usr/bin/perl

use Net::Telnet::Cisco;

my $session = Net::Telnet::Cisco->new(Host => 'x.x.x.x');
$session->login('TelnetUser', 'TelnetPassword');

# Execute a command
my @output = $session->cmd('show version');
print @output;

# Enable mode
@output = $session-> cmd('show privilege');
print "My privileges: @output\n";
$session->close;

If you want to add "Net::Telnet:Cisco" or something like that manually, you can search the related perl library on site http://search.cpan.org.
For Example http://search.cpan.org/~joshua/Net-Telnet-Cisco-1.10/Cisco.pm link is used in the sample we have just given.
And you can also download http://search.cpan.org/CPAN/authors/id/J/JO/JOSHUA/Net-Telnet-Cisco-1.10.tar.gz compressed file.

Note:
After extracting it, enter extracted directory. Execute perl Makefile.PL.
The "make" and "make install" commands produces the output below:

user@hostn:~/DIR> tar xvfz Net-Telnet-Cisco-1.10.tar.gz 
Net-Telnet-Cisco-1.10/
Net-Telnet-Cisco-1.10/README
Net-Telnet-Cisco-1.10/Cisco.pm
Net-Telnet-Cisco-1.10/.cvsignore
Net-Telnet-Cisco-1.10/MANIFEST
Net-Telnet-Cisco-1.10/test.pl
Net-Telnet-Cisco-1.10/MANIFEST.SKIP
Net-Telnet-Cisco-1.10/Changes
Net-Telnet-Cisco-1.10/INSTALL
Net-Telnet-Cisco-1.10/Makefile.PL
Net-Telnet-Cisco-1.10/TODO
user@hostn:~/DIR> cd Net-Telnet-Cisco-1.10/
user@hostn:~/DIR/Net-Telnet-Cisco-1.10> perl Makefile.PL 
Checking if your kit is complete...
Looks good
Writing Makefile for Net::Telnet::Cisco
user@hostn:~/DIR/Net-Telnet-Cisco-1.10> make
cp Cisco.pm blib/lib/Net/Telnet/Cisco.pm
AutoSplitting blib/lib/Net/Telnet/Cisco.pm (blib/lib/auto/Net/Telnet/Cisco)
Manifying blib/man3/Net::Telnet::Cisco.3pm
user@hostn:~/DIR/Net-Telnet-Cisco-1.10> make install
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ERROR: Can't create '/usr/lib/perl5/site_perl/5.12.3/Net/Telnet'
Do not have write permissions on '/usr/lib/perl5/site_perl/5.12.3/Net/Telnet'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 at -e line 1
make: *** [pure_site_install] Error 13
user@hostn:~/DIR/Net-Telnet-Cisco-1.10> sudo make install
root's password:
Appending installation info to /usr/lib/perl5/5.12.3/i586-linux-thread-multi/perllocal.pod
user@hostn:~/DIR/Net-Telnet-Cisco-1.10> 

The last step is installing which is required root permissions. So When used without root permission, It returned an error than used "sudo" to get root permission, It finally successful.

RCaller: Support for sequential commands with a single process

I think, this revision will be the foundation of the version  2.1. RCaller is supposed to be slow but the easiest way of calling R from Java.

Finally I have implemented the method runAndReturnResultOnline() for running sequential commands in a single process. What does this stand for? Let me give an example to explain this:

Suppose that you want to perform a simulation study to measure the success of your new procedure. For this, you decide to draw random numbers from a distribution and calculate something and handle the results in Java. RCaller creates  Rscript processes for each single iteration. This cause to too many operating system calls.

Latest release of RCaller includes the method for this. Lets have a look at the Test file:

@Test
  public void onlineCalculationTest() {
    RCaller rcaller = new RCaller();
    rcaller.setRExecutable("/usr/bin/R");
    rcaller.cleanRCode();
    rcaller.addRCode("a<-1:10");
    rcaller.runAndReturnResultOnline("a");
    assertEquals(rcaller.getParser().getAsIntArray("a")[0], 1);

    rcaller.cleanRCode();
    rcaller.addRCode("b<-1:10");
    rcaller.addRCode("m<-mean(b)");
    rcaller.runAndReturnResultOnline("m");
    assertEquals(rcaller.getParser().getAsDoubleArray("m")[0], 5.5, 0.000001);

    rcaller.cleanRCode();
    rcaller.addRCode("a<-1:99");
    rcaller.addRCode("k<-median(a)");
    rcaller.runAndReturnResultOnline("k");
    assertEquals(rcaller.getParser().getAsDoubleArray("k")[0], 50.0, 0.000001);
  }
  }

In first stage,we are creating an integer vector and getting the first element. In the second one, we are creating the same integer vector with a different name and calculating the arithmetic mean. In the last one, we are recreating the vector a and getting the median, which is equal to 50.

This example uses the same RCaller object. In first stage, the R executable file (it is /usr/bin/R in my Ubuntu Linux) is created once. In second stage the same R file is used and no longer processes are created again. In this stage, the vector a is accessible and still remains alive. At the last stage, b is alive again and a is recreated. So this example does not cause the R to open and close three times but only once.

This modification speeds up the RCaller, but it can be still considered as slow.
However, it is still easy to implement and much more faster than the previous implementation.

Have Fun!

Handling R lists with RCaller 2.0

Since RCaller creates an Rscript process for each single run, it is said to be in-efficient for most cases. But there are useful non-hack methods to improve the method. Suppose that your aim is to calculate medians of two double vector like this:

@Test
  public void singleResultTest() {
    double delta = 0.0000001;
    RCaller rcaller = new RCaller();
    rcaller.setRscriptExecutable("/usr/bin/Rscript");
    rcaller.cleanRCode();
    rcaller.addRCode("x <- c(6 ,8, 3.4, 1, 2)");
    rcaller.addRCode("med <- median(x)");

    rcaller.runAndReturnResult("med");

    double[] result = rcaller.getParser().getAsDoubleArray("med");

    assertEquals(result[0], 3.4, delta);
  }

However, this example considers only computing the median of x, effort for computing medians of three variables needs three process which is very slow. Lists are "vector of vector" objects but they are different from matrices. A list object in R can handle several types of vector with their names. For example

alist <- list (
s = c("string1", "string2", "string3") , 
i = c(5,4,7,6),
d = c(5.5, 6.7, 8.9)
)

the list object alist is formed by three different kind of vectors: string vector s, integer vector i and double vector d. Also their names are s, i and d, respectively. Accessing elements of this list is straightforward. There are two ways to access to elements. First one is conventional way using indices. When the example above runs, strvec is set to String vector s.

alist <- list (
strvec <- alist[1]

While a list object can handle R objects with their names, we can handle more than more result in a single RCaller run. Back to our example, we wanted to calculate medians of three double vectors in a single run.

@Test
  public void TestLists2()throws Exception {
    double delta = 0.0000001;
    RCaller rcaller = new RCaller();
    rcaller.setRscriptExecutable("/usr/bin/Rscript");
    rcaller.cleanRCode();
    rcaller.addRCode("x <- c(6 ,8, 3.4, 1, 2)");
    rcaller.addRCode("med1 <- median(x)");

    rcaller.addRCode("y <- c(16 ,18, 13.4, 11,12)");
    rcaller.addRCode("med2 <- median(y)");

    rcaller.addRCode("z <- c(116 ,118, 113.4,111,112)");
    rcaller.addRCode("med3 <- median(z)");

    rcaller.addRCode("results <- list(m1 = med1, m2 = med2, m3 = med3)");

    rcaller.runAndReturnResult("results");

    double[] result = rcaller.getParser().getAsDoubleArray("m1");
    assertEquals(result[0], 3.4, delta);

    result = rcaller.getParser().getAsDoubleArray("m2");
    assertEquals(result[0], 13.4, delta);

    result = rcaller.getParser().getAsDoubleArray("m3");
    assertEquals(result[0], 113.4, delta);
  }

This code passes the tests. By the result at hand, we have three medians of three different vectors with one pass calculation. With this way, an huge number of vectors can be accepted as a result from R and this method may be considered efficient... these test files were integrated to source structure of project in http://code.google.com/p/rcaller/

hope works!

about the current Internet Connection in Turkey

30 minutes ago... Something happened. And now: Turkey has a very very slow internet access for the sites out of Turkey. Probably there is something wrong. I wanna share with all quickly.

I checked some news on some web sites and telecommunication companies but I can not find anything about it. Everything is possible. But somebody want to know the reason. :)