Mailinglist Archive: opensuse (882 mails)

["David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx>]

On 12/02/2010 06:15 PM, John Andersen wrote:
> On 12/2/2010 3:37 PM, David C. Rankin wrote:
> > Guys,
> >
> >      What would I use to get a list of hosts on the local subnet aside from 
> > dumping
> > the forward zone in bind or doing a ping -c .1 subnet.1-254? I want to find
> > something I can call from a script to return the list to either a single
> > variable or an array.
> >
> >      I'm open to anything, but would prefer a BASH or c solution.
>
> I use my Nexus One.  Use to use my iPhone.  Lots of apps for that.
>
> When no tools at hand:
> ping -c 2 -b <broadcast IP>       (something like 192.168.1.255 - You need -b 
> option)
> -c 2 sends just two pings.  No need to get crazy.
>
> then immediatly do
>
> /sbin/arp -n
>
> And you will have a list of hosts by IP.

Damn,

        I should have waited for your answer :p  I did it the hard way with 
arpd, but
it worked :p

#!/bin/bash

oifs=$IFS
IFS=$'\n'

declare -a arptable
arptable=( $(sudo arpd -b /var/lib/arpwatch/arpd.db -l) )

printf "\n%-25s %-20s    %s\n" "Hostname" "IP" "Mac"

numrec=${#arptable[@]}

for ((i=0;i<$numrec;i++)); do
  tmp=${arptable[$i]}
  mac=${tmp##* }
  ip=${tmp:1}                        # trim first char
  ip="${ip#"${ip%%[![:space:]]*}"}"  # remove leading whitespace characters
  ip=${ip%% *}                       # remove mac and trailing whitespace 
characters
  hn=$(nslookup $ip)
  hn=${hn##*= }
  hn=${hn%%.*}
  [[ $hn =~ Server: ]] && hn="gateway (Linksys)"
  [[ $i -gt 0 ]] && printf "%-25s %-20s    %s\n" $hn $ip $mac
done


-- 
David C. Rankin, J.D.,P.E.
Rankin Law Firm, PLLC
510 Ochiltree Street
Nacogdoches, Texas 75961
Telephone: (936) 715-9333
Facsimile: (936) 715-9339
www.rankinlawfirm.com
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