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Re: grep ip address from dhcpd.leases file

by Kenosis (Priest)
on Dec 14, 2013 at 17:19 UTC ( #1067161=note: print w/ replies, xml ) Need Help??


in reply to grep ip address from dhcpd.leases file

A lease record may not contain a client-hostname, so your file parsing should accommodate that. DB suggestions have been provided. Perhaps the following parsing option, which would read the file in lease-record 'chunks' (via local $/ = 'lease';), will be a helpful start:

use strict; use warnings; local $/ = 'lease'; while (<DATA>) { my ($ip) = /\s+(\S+)\s+/ or next; my $client = /client-hostname\s+(".+")/ ? $1 : ''; print "$ip,$client\n"; } __DATA__ lease 192.168.20.4 { starts 6 2009/06/27 00:40:00; ends 6 2009/06/27 12:40:00; hardware ethernet 00:00:00:00:00:00; uid 00:00:00:00:00:00; client-hostname "examle-workstation1"; } lease 192.168.20.5 { starts 6 2009/06/27 00:40:00; ends 6 2009/06/27 12:40:00; hardware ethernet 00:00:00:00:00:00; } lease 192.168.20.6 { starts 6 2009/06/27 00:40:00; ends 6 2009/06/27 12:40:00; hardware ethernet 00:00:00:00:00:01; uid 00:00:00:00:00:01; client-hostname "examle-workstation2"; } lease 192.168.20.7 { starts 6 2009/06/27 00:40:00; ends 6 2009/06/27 12:40:00; hardware ethernet 01:00:00:00:00:00; }

Output:

192.168.20.4,"examle-workstation1" 192.168.20.5, 192.168.20.6,"examle-workstation2" 192.168.20.7,


Comment on Re: grep ip address from dhcpd.leases file
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Re^2: grep ip address from dhcpd.leases file
by varalaxmibbnl (Acolyte) on Dec 15, 2013 at 07:40 UTC
    thanks for the reply..if i want to take the present ip address which are entering into that dhcp.leases then is there any module to do that...thanks in advance..

      Provided you have read permissions for dhcp.leases, just use that file as your data source in the above script:

      use strict; use warnings; local $/ = 'lease'; my $leaseFile = '/var/lib/dhcp3/dhcpd.leases'; open my $fh, '<', $leaseFile or die $!; while (<$fh>) { my ($ip) = /\s+(\S+)\s+/ or next; my $client = /client-hostname\s+(".+")/ ? $1 : ''; print "$ip,$client\n"; } close $fh;

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