Compare an item in one line of a file against an item in the next line of the same file Post: 303045909

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Top Forums Shell Programming and Scripting Compare an item in one line of a file against an item in the next line of the same file Post 303045909 by championc on Friday 17th of April 2020 05:48:41 PM

04-17-2020

Registered User

Thanks for taking the time to reply

I am trying to work with a firewall ruleset. Every DROP rule should have a partner LOG rule. But from the following, you can see that two rules do not have a corresponding LOG rule. So I am trying to process the file and identify all rules I have a DROP but no LOG. The two offenders in this selection below are in BOLD

Code:

set security firewall name Private-to-AA rule 25 action 'drop'
set security firewall name Private-to-AA rule 9999 action 'drop'
set security firewall name Private-to-AA rule 9999 'log'
set security firewall name Private-to-BB default-action 'drop'
set security firewall name Private-to-BB 'default-log'
set security firewall name Private-to-CC default-action 'drop'
set security firewall name Private-to-CC 'default-log'
set security firewall name Private-to-CC rule 9999 action 'drop'
set security firewall name Private-to-CC rule 9999 'log'
set security firewall name Private-to-DD default-action 'drop'
set security firewall name Private-to-DD 'default-log'
set security firewall name Private-to-DD rule 9999 action 'drop'
set security firewall name Private-to-DD rule 9999 'log'
set security firewall name local default-action 'drop'
set security firewall name local rule 10 action 'drop'
set security firewall name local rule 10 'log'

championc

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lire::firewall::iptablesdlfconverter

IptablesDlfConverter(3pm)				  LogReport's Lire Documentation				 IptablesDlfConverter(3pm)

NAME

       IptablesDlfConverter - convert netfilter/iptables syslog logs to firewall DLF

DESCRIPTION

       IptablesDlfConverter converts Linux 2.4 iptables packet log into firewall DLF format.

LIMITATIONS

       The netfilter logging modules don't log the status of the packet (drop, accept, reject) like the ipchains logging code. You can specify a
       prefix that will be used in the log. This converter will mark the packet as 'denied' whenever that prefix matches (case insensitive) the
       following regex: 'denied|deny|drop|reject|unallowed', it will mark the packet as 'permitted' whenever that prefix matches (case
       insensitive) the following regex: 'accept|permit', and all other packets will have '-' as the value of the 'action' field.

       So in order for this converter to detect 'denied' packets, you should use a prefix containing one of those substrings.

       For example:

	iptables -N lodrop
	iptables -A logdrop -j LOG --log-prefix "Packet-DENY: "
	iptables -A logdrop -j DROP

       or other similar prefixes: 'denied: ', 'Packet-REJECT: ', ...

       The prefix used will end up in the 'rule' field of the DLF record.

EXAMPLES

       IptablesDlfConvertor will be rarely used on its own, but is more likely called by lr_log2report:

	$ lr_log2report iptables < /var/log/iptables.log > report

SEE ALSO

       The Netfilter webpage at http://netfilter.samba.org/ .

AUTHORS

       Francis J. Lacoste <flacoste@logreport.org>

VERSION

       $Id: IptablesDlfConverter.pm,v 1.12 2006/07/23 13:16:35 vanbaal Exp $

COPYRIGHT

       Copyright (C) 2001, 2002, 2003, 2004 Stichting LogReport Foundation LogReport@LogReport.org

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
       http://www.gnu.org/copyleft/gpl.html.

Lire 2.1.1							    2006-07-23						 IptablesDlfConverter(3pm)