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|
#!/usr/bin/perl
#
# Script performs NAPTR lookups on E164 phone numbers
#
# Written by: James Golovich <james@gnuinter.net>
#
#
# Called like exten => _1NXXNXXXXXX,1,AGI,agi-enum.agi|enum.example.com
#
# Sample bind9 entries
#this example uses the replacement field:
#4.3.2.1.5.5.5.0.0.8.1 IN NAPTR 100 100 "u" "E2U+iax" . iax:testing.example.com.
#the Dialed string would be IAX/testing.example.com
#
#this example uses the regexp field:
#4.3.2.1.5.5.5.0.0.8.1 IN NAPTR 250 100 "u" "E2U+tel" "!^(.*)$!tel:\\1!" .
#the Dialed string would be Zap/g2/18005551234
#
#this example uses the regexp field to strip off the leading 1:
#4.3.2.1.5.5.5.0.0.8.1 IN NAPTR 150 100 "u" "E2U+sip" "!^1(.*)$!sip:\\1@testing.example.com!" .
#the Dialed string would be SIP/8005551234@testing.example.com
#
use Asterisk::AGI;
use Net::DNS;
#DEFAULTDOMAIN is the default domain to append to lookups that don't include a domain
$DEFAULTDOMAIN = 'enum.example.com';
#DEFAULTTIMEOUT is the timeout seconds passed to the Dial app to wait for each call
$DEFAULTTIMEOUT = 25;
#SET ALLOWPSTN to allow tel: entries to be converted to Zap dialstrings. Default is disabled
# Be Careful with this, it will dial whatever is passed in the entry
#$ALLOWPSTN = 1;
#DEFAULTPSTN is the prefix to be added to tel: entries
$DEFAULTPSTN = 'Zap/g2';
@PROTOCOLS = ( 'iax', 'sip', 'tel'
# 'h323'
);
$AGI = new Asterisk::AGI;
my %input = $AGI->ReadParse();
my $num = $input{'extension'};
if (!$num) {
exit;
}
if ($ARGV[0] =~ /([\w\-\.]+)/) {
$domain = $1;
} else {
$domain = $DEFAULTDOMAIN;
}
@test = naptr_query($num, $domain);
for $x ( 0 .. $#test ) {
if ($aref = $test[$x]) {
$y = @$aref - 1;
for $z ( 0 .. $y ) {
if ($test[$x][$z]) {
if ($res = place_call($test[$x][$z])) {
exit $res;
}
}
}
}
}
sub place_call {
my ($location) = @_;
my $res = 0;
my $option = '';
if ($location =~ /sip:(.*)/i) {
$option = 'SIP/' . $1;
} elsif ($location =~ /iax:(.*)/i) {
$option = 'IAX/' . $1;
} elsif ($location =~ /h323:(.*)/i) {
$option = 'H323/' . $1;
} elsif ($ALLOWPSTN && $location =~ /tel:(.*)/i) {
my $telnum = $1;
#strip all non-numeric
$telnum =~ s/[^0-9]//g;
$option = $DEFAULTPSTN . '/' . $telnum;
}
if ($option) {
$option .= '|' . $DEFAULTTIMEOUT if ($DEFAULTTIMEOUT);
$AGI->verbose("Executing Dial $option\n",3);
$res = $AGI->exec('Dial', $option);
}
return $res;
}
sub naptr_query {
my ($lookup, $domain) = @_;
my $dns = Net::DNS::Resolver->new;
my $name = reversenum($lookup) . '.' . $domain;
$query = $dns->search($name, 'NAPTR');
if ($query) {
foreach $rr ($query->answer) {
next unless $rr->type eq "NAPTR";
my $order = $rr->order;
my $pref = $rr->preference;
if ($rr->flags !~ /u/i) {
next;
}
foreach $svct (split(/\+/,$rr->service)) {
next if ($svct =~ /E2U/i);
next if (!validprotocol($svct));
}
if ($rr->replacement) {
$host = naptr_replace($rr->replacement, $rr->regexp, $lookup);
} else {
$host = naptr_regexp($rr->regexp, $lookup);
}
$hosts[$order][$pref] = $host;
}
}
return @hosts;
}
sub naptr_replace {
my ($replace, $regex, $number) = @_;
return $replace;
}
sub naptr_regexp {
my ($string, $number) = @_;
my $regex = '';
my $data = '';
if ($string =~ /^(.).*(.)$/) {
$delim = $1 if ($1 eq $2);
} else {
return '';
}
if ($string =~ /$delim(.*)$delim(.*)$delim/) {
$regex = $1;
$data = $2;
if ($regex) {
if ($number =~ /$regex/) {
if ($t = $1) { $data =~ s/\\1/$t/g; }
if ($t = $2) { $data =~ s/\\2/$t/g; }
if ($t = $3) { $data =~ s/\\3/$t/g; }
if ($t = $4) { $data =~ s/\\4/$t/g; }
if ($t = $5) { $data =~ s/\\5/$t/g; }
if ($t = $6) { $data =~ s/\\6/$t/g; }
if ($t = $7) { $data =~ s/\\7/$t/g; }
if ($t = $8) { $data =~ s/\\8/$t/g; }
if ($t = $9) { $data =~ s/\\9/$t/g; }
}
}
}
return $data;
}
sub reversenum {
my ($num) = @_;
#remove all non numeric
$num =~ s/[^0-9]//g;
return join('.', split(/ */, reverse($num)));
}
sub validprotocol {
my ($prot) = @_;
my $valid = 0;
foreach (@PROTOCOLS) {
if (m/$prot/i) {
$valid = 1;
}
}
return $valid;
}
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