Jumbled Sundays

What is Sunday ? The day with no work, no challenge or the day with lots of thought with full of imagination. Actually Sunday is the day in which you can explore tons of good options. Options to do something good with your life ? Or to make your lifestyle better than ever ? Or just lay in your bed  ? third one is more intuitive actually ;)

This question is keep bugging me from past few months. Actually my conscious mind wants to do something, something innovative or something different from my daily routine like playing guitar or like watching some thoughtful documentaries or reading some good books. But my subconscious mind wants totally different thing, actually it wants to be lazy after work of 5 days, my subconscious mind force me to do nothing, it just want to go in hibernate mode and try to be less thoughtful.

Still these are my mixed  Sundays. Hope for the change from next time.

शुरआत

पीर है मेरी बड़ी,
इस का कोई इन्साफ तो हो

रोज मेरे जख्मों का
जर्जर सही कुछ इलाज तो हो

राज़ बहूत ही गंभीर हैं
मगर मेरे सपनो का आगाज़ तो हो

इन पंखों के पैर नहीं
लेकिन इन मैं कुछ उड़ान तो हो

इस मन को कुछ लाभ नहीं,
पर मेरा कुछ नुकसान न हो

आज नहीं तो कल सही,
कहीं से  मेरी भी  शुरआत तो हो

Scripts of the week

Hi, blogging again after a long time. feeling lots of ups and down during the period..hell leave it for now..
I dedicate last week to writing the scripts, I wrote vim plugin for uploading and downloading the code to/from pastebin and also created an API using wurfl to detect the mobile device config and provide the run time support to it.

Vim Plugin Story :
Finally I wrote my own vim plugin, I had an idea long time ago, but never get the time to implement it, during this weekend I have nothing much to do so, I decide to go with the plugin and give rest to other tasks, I spend two days on writing plugin.
Plugin basically parse the HTML code using the beautiful soup python module. After getting the branch of the code text, I removed the additional HTML tags and copied it to the vim editor.

import urllib2
from BeautifulSoup import BeautifulSoup
import sys
data=urllib2.urlopen(sys.argv[1]).read();
soup = BeautifulSoup(''.join(data))
code=soup('div', {'id' : 'code_frame'})
soup = BeautifulSoup(''.join(str(code[0]).strip()))
code_text = soup.div.div

text=''.join(BeautifulSoup(str(code_text).strip()).findAll(text=True))
code_for_vim =  BeautifulSoup(str(text).strip(), convertEntities=BeautifulSoup.HTML_ENTITIES)
print code_for_vim

above code print the code pasted on the valid link of the pastebin, this involves parsing of the HTML source and beautiful soup does it beautifully ;). I called above python script from the vim
function command! -nargs=0 PasteBin :call pasteCodeFromPasteBin()
which could be called by user from vim editor by typing :Pastebin.

fun! pasteCodeFromPasteBin()
let g:binLink = input("Enter valid pastebin link : ")
let g:data=system('python ~/.vim/plugin/beautiful.py '.g:binLink)
set paste
exec "normal O".g:data
startinsert
endfun

and for uploading the code directly from vim editor, I used pastebin api http://pastebin.com/api_public.php which require code to be pasted, language preference, email ID, title etc details passed as a post argument with an api, for this I used 'curl -d' and perl

let g:data=system('cat '.bufname("%").'| perl -p -e ''s/([^A-Za-z0-9])/sprintf("%%%02X", ord($1))/seg''')
let g:query='paste_private=0&paste_code='.theg:data.'&paste_name='.g:name.'&paste_email='.g:pastebin_emailid.'&paste_format='.g:pastebin_language
let g:out=system('curl -d -s"'.g:query.'" http://pastebin.com/api_public.php ')

WURFL Story:
WURFL is a Device Description Repository (DDR), i.e. a software component which contains the descriptions of thousands of mobile devices with the help of WURFL I create an API which can detect not only the device but can also find the nearest match from the available configs and provide the run time support to it.

// Include the WURFL/Application.php file
require_once "WURFL_Installation_Dir/WURFL/Application.php";
 
// Provide the absolute or relative path to your wurfl-config.xml
$wurflConfigFile = "wurfl-config.xml";
 
// Create WURFL Configuration from an XML config file
$wurflConfig = new WURFL_Configuration_XmlConfig($wurflConfigFile);
 
// Create a WURFL Manager Factory from the WURFL Configuration
$wurflManagerFactory = new WURFL_WURFLManagerFactory($wurflConfig);
 
// Create a WURFL Manager
$wurflManager = $wurflManagerFactory->create();
?>

WURFL maintains the database in wurfl-config.xml file and which is created on the basis of the user agent of the different devices, by passing the argument of $_SERVER array to the WURFL API we can get the exact model, brand, device OS, resolution and other additional details. http://wurfl.sourceforge.net/help_doc.php#product_info online doc available for getting different capability sets of the device.

:-)
fat0ss

Linux magical commands

Linux command like a magic stick in the hand of wizard, more you practice more you find scope of learning. I am playing with it from few years and still I find myself n00b in this context, although today I planed to share my n00b experience with you regards to few basic Linux commands . This POST is totally belongs to the beginners.

---

cat :
concatenate files and print on the standard output
$> cat file.txt gt; cat file.txt ##print the content of the file on terminal
$> cat -n file.txt gt; cat -n file.txt ##print the content of file with line number

---

grep :
grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines.
$>grep apple fruitlist.txt ##grep prints all lines containing apple
$>grep -w apple fruitlist.txt ##grep prints all lines containing apple as a word
You can also use grep with regular expressions

---

sed
is a stream editor. A stream editor is used to perform basic text transformations on an input stream. While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the input(s), and is consequently more efficient. But it is sed's ability to filter text in a pipeline which particularly distinguishes it from other types of editors.

$>sed -e 's/oldstuff/newstuff/g' inputFileName > outputFileName$>
##s Substitute command
##g global
##/../../ Delimiterday
##(oldstuff)Regular Expression Pattern Search Pattern
##(newstuff)night Replacement string

---

awk :
An AWK program is a sequence of pattern {action} pairs and function definitions. Short programs are entered on the command line usually enclosed in ' ' to avoid shell interpretation. Longer programs can be read in from a file with the -f option. Data input is read from the list of files on the command line or from standard input when the list is empty.
$>awk [ -F ] {pgm} | { -f } [ ] [ - | ]
##ch: Field-separator character.
##pgm: Awk command-line program
##pgm file: File containing an Awk program.
##vars: Awk variable initializations.
##data file: Input data file.

---

tr :
Translate, squeeze, and/or delete characters from standard input, writing to standard output.
$>tr 'abcd' 'jkmn' ##maps 'a' to 'j', 'b' to 'k', 'c' to 'm', and 'd' to 'n'.
$>cat file.txt | tr -d '\n' ##delete new line character from file

---

curl :
Curl is a computer software project providing a library and command-line tool for transferring data using various Protocols.
$>curl -o example.html www.example.com ##cURL can write the output it retrieves to a file with the -o flag
$>curl www.example.com

---

A small grep Tool

Yesterday, I was reading about the regular expressions design that how first developer wrote the complex code with minimal complexity, Since now I know the design of the minimal version of regular expression code I decided to share it. code in itself is quite simple and self explanatory..although I marked the complex part with appropriate comments.

 
int grep (char *regexp, char *text)
{
if (*regexp == '$' ){                       /*End of regular expression*/
if ( *(regexp+1) == '\0' ){
return 1;
} else {
return 0;
}
} else if ( *regexp == '.' ) {              /*Single character presence*/
return grep ( regexp + 1, text + 1 );
} else if ( *regexp == '*') {               /*multi character presence*/
return matchstar(regexp+1, text);
} else if ( *regexp == *text  ) {        
return grep ( regexp + 1, text + 1 );
} else {
return 0;
}
}

The above code has the four important regions and will detect the expressions for *,.,$ code will return 1 on success.

 
int matchstar(char *regexp, char *text)
{
if ( grep (regexp, text ) ){                  /*end of multi character match*/
return 1;
} else {
matchstar(regexp, text+1);
}
}

The code is matching multi character presence and checking it's end recursively.

 
int main(int argc, char **argv)
{
 FILE *file;
 char text[200];     
 char c;
 size_t size = 0;

 if (argc >= 3) {
  file = fopen(argv[1], "r");
  
  while(EOF != (c = getc(file))){
   if (c=='\n'){
    text[size] = '\0';
    int i = 0;
    for ( i = 0; i < size; i++){
     if (grep(argv[2], text + i)) {
      printf("%s\n", text);
      break;
     }
    }
    size = 0;
   } else {
    text[size] = c;
    size++;
   }
  }
 }
 return 0;
}

Compilation Instruction

[~/CODE]
13:04:24 $ gcc -o grep grep.c

[~/CODE]
13:04:36 $ gedit grep.c


./grep file_name regular_expression$

[~/CODE]
13:37:32 $ cat test
my
myname is
my name is khan
dog
cat is my pet
peterson is an awesome player

[~/CODE]
13:37:35 $ ./grep test m*k$
my
myname is
my name is khan
cat is my pet
peterson is an awesome player

[~/CODE]
13:37:39 $ ./grep test dog$
dog

[~/CODE]
13:37:43 $ ./grep test awsome$

[~/CODE]
13:37:49 $ ./grep test aw.some$
peterson is an awesome player



:-fat0ss

nmap scans : some basics over LAN

nmap : nmap(network mapper) is a network scanning tool written by Gordon Lyon and used to scan port, IP, operating systems,services on computer network

Here, I List some useful set of nmap scans over LAN :

1)ping a range of IP addresses
nmap -sP 192.168.1.100-254

-sP: Ping Scan

2)list all opened ports on host
nmap -p 1-65535 --open IP

-p : port range
--open: Only show open
Where IP may be a single IP, a hostname or a subnet

3)Get info about remote host ports and OS detection
nmap -sS -P0 -sV -O IP

Where IP may be a single IP, a hostname or a subnet
-sS TCP SYN scanning (also known as half-open, or stealth scanning)
-P0 option allows you to switch off ICMP pings.
-sV option enables version detection
-O flag attempt to identify the remote operating system
Other option:
-A option enables both OS fingerprinting and version detection
-v use -v twice for more verbosity.

Useful Links:

* Installation Guide
* Document of Nmap
* Books on Nmap


:-fat0ss

freopen() : change Mode back

Yesterday, I found a particular problem with the C function freopen(), so I decide to share it with you

Problem is with the function freopen(); the function change the role of the usual stdin, stdout for the file operation.

Problem : if I use freopen, how can I get the original stdout (or stdin) back?
FOF, this is not a good way to doing the file handling and my suggestion is always use your own explicit output (or input) stream variable, for the file operation.

Solution : solution of this particular problem is given by using dup, dup2 , dup and dup2 are the system call for duplicating underling file descriptor, which are present in UNIX/LINUX but not necessary any where else.

Reference:
http://c-faq.com/stdio/undofreopen.html
http://c-faq.com/stdio/rd.kirby.c

:-fat0ss