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Full Discussion: IP Ping Sweep
Top Forums Shell Programming and Scripting IP Ping Sweep Post 302902689 by sudo on Wednesday 21st of May 2014 05:29:49 PM
Old 05-21-2014
IP Ping Sweep
I put this together to search for unused IP addresses on a router. It's run as a Bash Command on OSX 10.9. Basically the user inputs the router address' IP range to sweep. 'jot' spits out a list of IP addresses based on that input and each one of those gets pinged. The output looks like this (tab delimitated):

xx.xxx.xx.xx Used name.domain.com
xx.xxx.xx.xx Used No Domain
xx.xxx.xx.xx Not_used


I was hoping to get help on 2 topics:

1. How can I manage error handling in the user input fields?
The first call to the user must only contain the first three quadrants of the router address: xx.xxx.xx(x). If I can just have it verify the input is numbers only with no more/less than 3 periods, that is sufficient
The last two calls are the low/high range inputs for the forth quadrant of the IP address which should be no more than 3 numbers (only numbers).

if entered incorrectly I would really like it to loop around and re-ask the user for that same input.

2. To exit, I press 'ctrl + c' but it requires I press it like 20 times before it breaks the actual process. I'm guessing I'm just breaking that instance of the while loop and it's moving onto the next line. Is there a more elegant way to do this without closing the window?

Any insight is appreciated. If there are any parts that can be streamlined below, let me know.

Code:
echo "\nEnter first three quadrants of router address (must contain three periods) \nExample- xx.xxx.xx. :"
read PT1ADD
echo 'Enter beginning range of the fourth quadrant :'
read PT2ADD
echo 'Enter the end range of the forth quadrant :'
read PT3ADD
echo '\n--------------------------------------'
echo 'Running scan on '$PT1ADD$PT2ADD-$PT3ADD
echo '--------------------------------------\n'
jot -w  $PT1ADD $PT3ADD $PT2ADD $PT3ADD | uniq |
while read SRC
do ping -c1 -W1 $SRC &>/dev/null
STATUS=$(echo $?)
    if [ $STATUS == 0 ]; then
        echo $SRC '\tUsed' | tr '\n' '\t'
        host $SRC | awk '/pointer/ {print $5}' | grep -m1 '.com' || echo 'No Domain'

## ^ I know grep is redundant here but if awk failed to find "pointer" it did not trigger the || echo 'No Domain' command. 
Grep was my workaround ##

    elif [ $STATUS == 2 ]; then
    echo $SRC '\tNOT_Used'
    else echo '\tPing Error Occured'
    fi
done
echo '\n--------------------------------------'
echo 'Scan Complete'
echo '--------------------------------------\n'

Last edited by sudo; 05-21-2014 at 06:30 PM.. Reason: typo
 

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LEARN ABOUT OPENSOLARIS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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