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.IX Title "RBLClient 3pm"
.TH RBLClient 3pm "2008-03-04" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Net::RBLClient \- Queries multiple Realtime Blackhole Lists in parallel
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&    use Net::RBLClient;
\&    my $rbl = Net::RBLClient\->new;
\&    $rbl\->lookup(\(aq211.101.236.160\(aq);
\&    my @listed_by = $rbl\->listed_by;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is used to discover what \s-1RBL\s0's are listing a particular \s-1IP\s0
address.  It parallelizes requests for fast response.
.PP
An \s-1RBL\s0, or Realtime Blackhole List, is a list of \s-1IP\s0 addresses meeting some
criteria such as involvement in Unsolicited Bulk Email.  Each \s-1RBL\s0 has
its own criteria for addition and removal of addresses.  If you want to
block email or other traffic to/from your network based on one or more
\&\s-1RBL\s0's, you should carefully study the behavior of those \s-1RBL\s0's before and
during such blocking.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "new( [\s-1ARGS\s0] )" 4
.IX Item "new( [ARGS] )"
Takes an optional hash of arguments:
.RS 4
.IP "lists" 4
.IX Item "lists"
An arraref of (sub)domains representing RBLs.  In other words, each element
in the array is a string similar to 'relays.somerbl.org'.  Use this if
you want to query a specific list of \s-1RBL\s0's \- if this argument is omitted,
a large list of \s-1RBL\s0's is queried.
.IP "query_txt" 4
.IX Item "query_txt"
Set this to true if you want Net::RBLClient to also query for \s-1TXT\s0 records,
in which many \s-1RBL\s0's store additional information about the reason for
including an \s-1IP\s0 address or links to pages that contain such information.
You can then retrieve these information using the \*(L"\fItxt_hash()\fR\*(R" method.
.IP "max_time" 4
.IX Item "max_time"
The maximum time in seconds that the lookup function should take.  In fact,
the function can take up to \f(CW\*(C`max_time + timeout\*(C'\fR seconds.  Max_time need
not be integer.  Of course, if the lookup returns due to max_time, some
\&\s-1DNS\s0 replies will be missed.
.Sp
Default: 8 seconds.
.IP "timeout" 4
.IX Item "timeout"
The maximum time in seconds spent awaiting each \s-1DNS\s0 reply packet.  The
only reason to change this is if \f(CW\*(C`max_time\*(C'\fR is decreased to a small value.
.Sp
Default: 1 second.
.IP "max_hits" 4
.IX Item "max_hits"
A hit is an affirmative response, stating that the \s-1IP\s0 address is on a certain
list.  If \f(CW\*(C`max_hits\*(C'\fR hits are received, \f(CW\*(C`lookup()\*(C'\fR returns immediately.
This lets the calling program save time.
.Sp
Default: 1000 (effectively out of the picture).
.IP "max_replies" 4
.IX Item "max_replies"
A reply from an \s-1RBL\s0 could be affirmative or negative.  Either way, it counts
towards \f(CW\*(C`max_replies\*(C'\fR.  \f(CW\*(C`Lookup()\*(C'\fR returns when \f(CW\*(C`max_replies\*(C'\fR replies
have been received.
.IP "udp_maxlen" 4
.IX Item "udp_maxlen"
The maximum number of bytes read from a \s-1DNS\s0 reply packet.  There's probably
no reason to change this.
.Sp
Default: 4000
.IP "server" 4
.IX Item "server"
The local nameserver to use for all queries.  Should be either a resolvable
hostname or a dotted quad \s-1IP\s0 address.
.Sp
By default, the first nameserver in /etc/resolv.conf will be used.
.RE
.RS 4
.SH "METHODS"
.IX Header "METHODS"
.RE
.IP "lookup( \s-1IPADDR\s0 )" 4
.IX Item "lookup( IPADDR )"
Lookup one \s-1IP\s0 address on all \s-1RBL\s0's previously defined.  The \s-1IP\s0 address
must be expressed in dotted quad notation, like '1.2.3.4'.  \f(CW\*(C`Lookup()\*(C'\fR
returns 1.
.IP "\fIlisted_by()\fR" 4
.IX Item "listed_by()"
Return an array of \s-1RBL\s0's which block the specified \s-1IP\s0.  The \s-1RBL\s0's are
indicated via the (sub)domain used for \s-1DNS\s0 query.  The calling program
must first call \f(CW\*(C`lookup()\*(C'\fR.
.IP "\fIlisted_hash()\fR" 4
.IX Item "listed_hash()"
Return a hash whose keys are the \s-1RBL\s0's which block the specified \s-1IP\s0,
represented as in \f(CW\*(C`listed_by()\*(C'\fR.  If the \s-1RBL\s0 returned an A record,
the value for that key will be the \s-1IP\s0 address in the A record \-
typically 127.0.0.1 \- 127.0.0.4.  If the \s-1RBL\s0 returned a \s-1CNAME\s0, the
value will be the hostname, typically used for a comment on why the
\&\s-1IP\s0 address is listed.
.IP "\fItxt_hash()\fR" 4
.IX Item "txt_hash()"
Return a hash (or a reference to that hash if called in a scalar
context) whose keys are the \s-1RBL\s0's which block the specified \s-1IP\s0,
represented as in \f(CW\*(C`listed_by()\*(C'\fR.  If the \s-1RBL\s0 returned \s-1TXT\s0 records
containing additional information, the value will contain this
information (several \s-1TXT\s0 records from one \s-1RBL\s0 will be joined by
semicolons, but this should not happen), if not, it will be
undef.
.SH "AUTHOR"
.IX Header "AUTHOR"
Asher Blum <\fIasher@wildspark.com\fR>
.SH "CREDITS"
.IX Header "CREDITS"
Martin H. Sluka <\fImartin@sluka.de\fR>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2002 Asher Blum.  All rights reserved.
This code is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.