Net::DNSBL::Monitor - Monitor DNSBL response
use Net::DNSBL::Monitor qw( run plaintxt htmltxt plainresp htmlresp ); ($dnsblcnts,$responses)=run(\%config,$NonBlockSock,$sockaddr_in); $text = plaintxt(\%config,\%dnsblcnts); $html = htmltxt(\%config,\%dnsblnts); $text = plainresp(\%responses); $html = htmlresp(\$config,\%responses);
Net::DNSBL::Monitor is the Perl module that can be used to check when ranges of IP addresses have been blacklisted. Net::DNSBL::Monitor generates a statistical report for the DNSBL's interrogated and provides an individual report for each IP address found in a DNSBL. The module is used to implement the reporting script dnsblmon.
With the addition of a few elements, the configuration file for dnsblmon shares a common format with the Mail::SpamCannibal sc_BLcheck.pl script, and Net::DNSBL::Statistics config file, facilitating common maintenance of DNSBL's for your MTA installation.
The sample configuration file monitor.conf.sample is heavily commented with the details for each configuration element.
A useful list of DNSBL zones for the config file (put together by "Andrey V. Stolyarov" <croco-gnu@openwall.com>) maybe found in the contrib directory zones4config.file.
zones4config.file
dnsblmon responds to the following system signals:
TERM
Script is terminated.
Net::DNSBL::Monitor provides most of the functions that implement dnsblmon which is a script that collects statistics and responses for a list of IP address interrogated against a list of DNSBL's
How to use dnsblmon
Syntax: dnsblmon path/to/config.file or dnsblmon -t path/to/config.file dnsblmon -w path/to/config.file
dnsblmon path/to/config.file -r -s dnsblmon path/to/config.file -s -r dnsblmon path/to/config.file \ -r path/outfile1 \ -s path/outfile2
Normally dnsblmon prints an IP report sorted by "comment" and IP of the DNSBL's interrogated with their reply results for each IP address.
The 'comment' field may contain html markup text.
i.e. commenta 1.2.3.4 127.0.0.3 zen.spamhaus.org 127.0.0.5 dnsbl.sorbs.net 1.2.3.5 127.0.0.5 dnsbl.sorbs.net commentb 3.4.5.6 127.0.0.2 bl.spamcannibal.org
With the (-s) switch, dnsblmon prints a sorted list (by count) of the DNSBL's interrogated with their reply count, percentage of the total count, and any comments from the DNSBL's 'comment' key field in the config file.
i.e. 44 100.0% TOTAL IP's interrogated 41 93.2% UNION of all results 34 77.3% dnsbl.sorbs.net comment ........
The -t switch will print a start and stop time to STDOUT
i.e. # start: Fri Jan 4 17:46:44 2008 # stop : Fri Jan 4 17:58:21 2008
The -w switch will put the output into an HTML table without the <table> statement </table>., a commment as above and with an <a href="...">dnsbl name</a> statement replacing the dnsbl name if the 'url' key is present in the config file.
The -r and -s switchs are position dependent output designators.
-r REPORT output designator -s STATISTICS output designator as follows: -r -s would produce the report on STDOUT and the statistics on STDERR. -s -r would produce the statistics on STDOUT and the report on STDERR. -s outfile1 -r outfile2 would write the statistics and report to outfile1 and outfile2 respectively.
Other combinations are possible. Switches are order dependent but not positionally dependent with respect to other switches
The input file format for dnsblmon consists of an address element block in the form used by NetAddr::IP followed by a 'comment field'. The report generated will be sorted on the 'comment field', then by IP address.
i.e. input format 1.2.3.4 single host IP belonging to XYZ 2.3.4.5/24 A class C belonging to ABC hosting etc...
($dnsblcnts,$responses)=run(\%config,$NonBlockSock,$sockaddr_in);
Returns the total number of IP's interrogated (IP list less white listed items) and a hash of DNSBL names and their respective SPAM reply counts or equivalent for 'in-addr.arpa' and GENERIC.
input: config pointer, non-blocking socket descriptor, sockaddr_in for local DNS host returns: pointer to dnsbl count hash pointer to response hash
The dnsbl count hash will have two added keys:
TOTAL the total number of interrogations less whitelist UNION the total number of spam 'hits'
The response hash will be of the form:
$response = { '1.2.3.4' => { 'COMMENT' => 'text from comment field for IP range', 'bl.xyz.com' => '127.0.0.2', 'bl.abc.net' => '127.0.0.5', }, etc... }; HINTs: use Net::NBsocket qw( open_udbNB sockaddr_in ); use Net::DNS::ToolKit qw( get_ns ); my $sock = open_udpNB(); my $sockaddr_in = sockaddr_in(53, scalar get_ns());
$text = plaintxt($config,\%dnsbls);
Generate a plain text report of the form:
44 100.0% TOTAL IP's interrogated 41 93.2% UNION of all results 34 77.3% dnsbl.sorbs.net comment 22 50.0% GENERIC comment 13 29.5% in-addr.arpa comment 11 25.0% cbl.abuseat.org comment 9 20.5% list.dsbl.org comment 2 4.5% dnsbl.njabl.org comment 1 2.3% bl.spamcannibal.org comment 0 0.0% dynablock.njabl.org comment input: configuration pointer, dnsbl count hash pointer returns: text buffer
The 'comment' comes from the config file 'comment' key field for each specified DNSBL or is blank if there is no 'comment' key.
$html = htmltxt($config,\%dnsbls);
Generate a report as above but with <tr><td></td></tr> table markup. The <table></table> tags are not generated. If there is a 'url' key field in the respective DNSBL config entry, the DNSBL name is provide with <a href="url">DNSBL</a> tags with the specified 'url' as the 'href' value.
input: configuration pointer, dnsbl count hash pointer returns: html text buffer
A one line example corresponding to the text line above:
34 77.3% dnsbl.sorbs.net with a 'comment' key of: 127.0.0.2,5,7,8,9,10,12 and a 'url' key of: http://www.au.sorbs.net/using.shtml <tr class=dnsbl><td align=right>34</td> <td align=right>77.3%</td> <td align=left><a href="http://www.au.sorbs.net/using.shtml">dnsbl.sorbs.net</a></td> <td align=left>127.0.0.2,5,7,8,9,10,12</td> </tr>
$text = plainresp(\%response);
comment string 1 ipaddr1 response code dnsbl response code dnsbl response code dnsbl ipaddr2 response code dnsbl comment string 2 ipaddr3 response code dnsbl etc... input: response hash pointer returns: text buffer
$html = htmlresp(\%config,\%response);
Generate a report as above but with <tr><td></td></tr> table markup. The <table></table> tags are not generated.
input: config hash pointer response hash pointer returns: html text buffer
Read the contrib/HOWTO document that describes the scripts used with 'cron' to auto generate web pages for the statistics reports
contrib/HOWTO
run plaintxt htmltxt plainresp htmlresp
Michael Robinton, michael@bizsystems.com
Copyright 2008-2014, Michael Robinton. 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; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Mail::SpamCannibal, Net::DNS::Codes, Net::DNS::ToolKit, Net::DNSBL::MultiDaemon NetAddr::IP
To install Net::DNSBL::Monitor, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Net::DNSBL::Monitor
CPAN shell
perl -MCPAN -e shell install Net::DNSBL::Monitor
For more information on module installation, please visit the detailed CPAN module installation guide.