AGI asterisk LDAP callerId lookup

#!/usr/bin/perl -w

# AGI Ldap CallerId Lookup for Asterisk
# LDAP schema is mozillaAbPersonAlpha, Number format "0894711"
# use exten => s,1,AGI(ldaplookupphone.agi) in extensions.conf
#
# V 0.01 2010-09-02 Reimer Prochnow, reimerp at gmx dot net
# Credits to Matt Schmandt and duese
# use as CC-BY-SA 3.0
#
# Done in Perl as Shell is not powerful enough for parsing output

use strict;

# far too slow: use Net::LDAP;
use MIME::Base64 qw(decode_base64);
use Encode qw(decode);

$|=1;

my $agi_callerid;
my $num;
if ($#ARGV >= 0) {
    $agi_callerid=$ARGV[0];         # for test
    $num="*$agi_callerid*";         # also allow wildcards around number
} else {

# Setup some variables
my %AGI;

while(<STDIN>) {
    chomp;
    last unless length($_);
    if (/^agi_(\w+)\:\s+(.*)$/) {
        $AGI{$1} = $2;
    }
}

#print STDERR "AGI Environment Dump:\n";
#foreach my $i (sort keys %AGI) {
#    print STDERR " -- $i = $AGI{$i}\n";
#}

$agi_callerid=$AGI{'callerid'};
$num=$agi_callerid;
}

my $cn='';

my $ldapcmd="/usr/bin/ldapsearch -h server -x -D cn=asterisk,dc=xxx,dc=yyy -w ***** " .
        "-b ou=personal,dc=xxx,dc=yyy -LLL -s one " .
        "\"(&(objectClass=mozillaAbPersonAlpha)(|(homePhone=$num)(mobile=$num)(pager=$num)(telephoneNumber=$num)))\"" .
        ' | sed -n -e "H;\${g;s/\n //g;p}"';    # does unfold, not that easy in perl

open (LDAP, "$ldapcmd |") || die ("Unable to open $ldapcmd: $!");
while (<LDAP>){
    chop;
    if (/([^:]*):: (.*)/) {
        $_="$1: " . Encode::decode('utf8', decode_base64($2));  # decodes UTF-8 for :: vars
    }
    if (/^dn[^=]*=([^,]*).*/) { $cn=$1; }
    elsif (/^([^:]*): .*$agi_callerid/) { $cn.='/'.substr($1,0,3);}     # builds: "peter falk/mob"
    #elsif (/^$/) { print "$cn\n"; }
    #print "$cn\n";
}

print 'SET CALLERID "' . $cn . '"<' . $agi_callerid . '>' . "\n";
#exit 0;