package Net::Telnet::Trango;
# $RedRiver: Trango.pm,v 1.27 2007/01/31 18:53:29 mike Exp $
use strict;
use warnings;
use base 'Net::Telnet';
=pod
=head1 NAME
Net::Telnet::Trango
- Perl extension for accessing the Trango telnet interface
=head1 SYNOPSIS
use Net::Telnet::Trango;
my $t = new Net::Telnet::Trango ( Timeout => 5 );
$t->open( Host => $fox ) or die "Error connecting: $!";
$t->login('password') or die "Couldn't log in: $!";
# Do whatever
$t->exit;
$t->close;
=head1 DESCRIPTION
Perl access to the telnet interface on Trango Foxes, SUs and APs.
Another handy feature is that it will parse the output from certain
commands that is in the format "[key1] value1 [key2] value2" and put
those in a hashref that is returned. This makes using the output from
things like sysinfo very easy to do.
=head2 EXPORT
None
=head1 METHODS
=over
=cut
our $VERSION = '0.01';
my %PRIVATE = (
is_connected => 0,
logged_in => 0,
);
=pod
=item B<new>
- Creates a new Net::Telnet::Trango object.
new([Options from Net::Telnet,]
[Decode => 0,]);
Same as new from L<Net::Telnet> but sets the default Trango Prompt:
'/#> *$/'
It also takes an optional parameter 'Decode'. If not defined it
defaults to 1, if it is set to 0, it will not decode the output and
instead return a reference to an array of the lines that were returned
from the command.
=cut
sub new
{
my $class = shift;
my %args;
if (@_ == 1) {
$args{'Host'} = shift;
} else {
%args = @_;
}
$args{'Prompt'} ||= '/#> *$/';
foreach my $key (keys %args) {
$PRIVATE{$key} = $args{$key};
}
$PRIVATE{'Decode'} = 1 unless defined $PRIVATE{'Decode'};
delete $args{'Decode'};
my $self = $class->SUPER::new(%args);
bless $self if ref $self;
return $self;
}
# _password <new password> <new password>
# ? [command]
# apsearch <secs> <ch#> <h|v> [<ch#> <h|v>]...
# arp -bcast <on|off>
# bcastscant <all|suid> <ch#> <h|v> [<ch#> <h|v> ...
# bye
# cf2cf ap [default|<size>]
# date
# date <month> <day> <year>
# freq scantable
# freq channeltable
# freq writescan [<ch#> <h|v>]
# freq writechannel [<ch#> <freq>] ...
# freq <ch #> <h|v>
# help [command]
# heater [<on temp> <off temp>]
# ipconfig [<new ip> <new subnet mask> <new gateway>]
# log [<# of entries, 1..179>]
# log <sum> <# of entries, 1..179>
# logout
# opmode [ap [y]]
# password
# ping <ip addr>
# polar <h|v>
# power <setism|setunii> <max|min|<dBm>>
# reboot
# restart
# remarks [<str>]
# rfrxthreshold [<ism|unii> <-90|-85|-80|-75|-70|-65>]
# rfrxth [<ism|unii> <-90|-85|-80|-75|-70|-65>]
# sysinfo
# set suid <id>
# set apid <id>
# set baseid <id>
# set defaultopmode [<ap|su> <min,0..10>]
# set defaultopmode off
# set snmpcomm [<read | write | trap (id or setall)> <str>]
# set mir [on|off]
# set mir threshold <kbps>
# set rssitarget [<ism|unii> <dBm>]
# set serviceradius [<ism | unii> <miles>]
# ssrssi <ch #> <h|v>
# su [<suid>|all]
# su changechannel <all|suid> <ch#> <h|v>
# su ipconfig <suid> <new ip> <new subnet> <new gateway>
# su [live|poweroff|priority]
# su <ping|info|status> <suid>
# su powerleveling <all|suid>
# su reboot <all|suid>
# su restart <all|suid>
# su testrflink <all|suid> [r]
# su testrflink <setlen> [64..1600]
# su testrflink <aptx> [20..100]
# su sw <suid|all> <sw #> <on|off>
# sudb [dload | view]
# sudb add <suid> pr <cir,kbps> <mir,kbps> <device id,hex>
# sudb add <suid> reg <cir,kbps> <mir,kbps> <device id,hex>
# sudb delete <all|<suid>>
# sudb modify <suid> <cir|mir> <kbps>
# sudb modify <suid> <su2su> <group id,hex>
# sudb view
# sulog [lastmins | sampleperiod <1..60>]
# sulog [<# of entry,1..18>]
# survey <ism|unii> <time, sec> <h|v>
# sw [<sw #> <on|off>]
# temp
# tftpd [on|off]
# time
# time <hour> <min> <sec>
# save <mainimage|fpgaimage> <current chksum> <new chksum>
# save <systemsetting|sudb>
# updateflash <mainimage|fpgaimage> <current chksum> <new chksum>
# updateflash <systemsetting|sudb>
=pod
=back
=head2 ACCESSORS
These are usually only set internally.
=over
=item B<firmware_version>
- returns the firmware version
Returns the firmware version if available, otherwise undef.
It should be available after a successful open().
=item B<host_type>
- return the type of host you are connected to.
returns the type of host from the login banner for example M5830S or M5300S.
Should be available after a successful open().
=item B<is_connected>
- Status of the connection to host.
returns 1 when connected, undef otherwise.
=item B<logged_in>
- Status of being logged in to the host.
returns 1 after a successful login(), 0 if it failed and undef if
login() was never called.
=item B<login_banner>
- The banner when first connecting to the host.
returns the banner that is displayed when first connected at login.
Only set after a successful open().
=item B<last_lines>
- The last lines of output from the last cmd().
returns, as an array ref, the output from the last cmd() that was run.
=item B<last_error>
- A text output of the last error that was encountered.
returns the last error reported. Probably contains the last entry in
last_lines.
=back
=head2 ALIASES
=over
=item B<bye>
- alias of L<exit()>.
=item B<restart>
- alias of L<reboot()>.
=back
=head2 COMMANDS
Most of these are just shortcuts to C<cmd(String =E<gt> METHOD)>,
as such they accept the same options as C<cmd()>.
Specifically they take a named paramater "args", for example:
C<tftpd(args =E<gt> 'on')> would enable tftpd
=over
=item B<tftpd>
- Returns a hash ref of the decoded output from the
command.
Also see enable_tftpd() and disable_tftpd() as those check that it was
successfully changed.
=item B<ver>
- Returns a hash ref of the decoded output from the
command.
=item B<sysinfo>
- Returns a hash ref of the decoded output from the
command.
=item B<exit>
- exits the command session with the Trango and closes
the connection
=item B<reboot>
- reboots the Trango and closes the connection
=item B<remarks>
- Set or retrieve the remarks.
Takes an optional argument, which sets the remarks.
If there is no argument, returns the current remarks.
my $old_remarks = $t->remarks();
$t->remarks($new_remarks);
=item B<sulog>
- returns an array ref of hashes containing each log
line.
=item B<save_sudb>
- returns true on success, undef on failure
=item B<syslog>
- returns the output from the syslog command
=item B<pipe>
- returns the output from the pipe command
=item B<maclist>
- returns the output from the maclist command
=item B<maclist_reset>
- resets the maclist.
No useful output.
=item B<eth_list>
- returns the output from the eth list command
=item B<su_info>
- returns information about the SU.
You need to pass in the $suid and it will return the info for that suid.
$t->su_info($suid);
=item B<save_ss>
- saves the config.
Returns 1 on success, undef on failure.
=cut
my $success = 'Success\\.';
my %COMMANDS = (
tftpd => { decode => 'all', expect => $success },
ver => { decode => 'all' },
sysinfo => { decode => 'all', expect => $success },
updateflash => { decode => 'all', expect => $success },
sulog => { decode => 'sulog', expect => $success },
'exit' => { no_prompt => 1, cmd_disconnects => 1 },
reboot => { no_prompt => 1, cmd_disconnects => 1 },
remarks => { decode => 'all', expect => $success },
save_sudb => { String => 'save sudb', expect => $success },
syslog => { expect => $success },
'pipe' => { }, # XXX needs a special decode
maclist => { decode => 'maclist' },
maclist_reset => { String => 'maclist reset', expect => 'done' },
eth_link => { String => 'eth link', expect => $success },
su_info => { String => 'su info', decode => 'all', expect => $success },
save_ss => { String => 'save ss', expect => $success },
opmode => { decode => 'all', expect => $success },
# eth r, w and reset???
#su password???
#_bootloader
#temp
#heater
);
my %ALIASES = (
bye => 'exit',
restart => 'reboot',
Host => 'host',
);
my %ACCESS = map { $_ => 1 } qw(
firmware_version
host_type
is_connected
logged_in
login_banner
Timeout
last_lines
last_vals
last_error
);
sub AUTOLOAD
{
my $self = shift;
my ($method) = (our $AUTOLOAD) =~ /^.*::(\w+)$/
or die "Weird: $AUTOLOAD";
if (exists $ALIASES{$method}) {
$method = $ALIASES{$method};
return $self->$method(@_);
}
if (exists $COMMANDS{$method}) {
$COMMANDS{$method}{'String'} ||= $method;
$COMMANDS{$method}{'args'} .= ' ' . shift if (@_ == 1);
return $self->cmd(%{ $COMMANDS{$method} }, @_);
}
if (exists $ACCESS{$method}) {
my $prev = $PRIVATE{$method};
($PRIVATE{$method}) = @_ if @_;
return $prev;
}
$method = "SUPER::$method";
return $self->$method(@_);
}
=pod
=item B<open>
- Open a connection to a Trango AP.
Calls Net::Telnet::open() then makes sure you get a password prompt so
you are ready to login() and parses the login banner so you can get
host_type() and firmware_version()
=cut
sub open
{
my $self = shift;
unless ( $self->SUPER::open(@_) ) {
$self->last_error("Couldn't connect to " . $self->host . ": $!");
return undef;
}
## Get to login prompt
unless ($self->waitfor(
-match => '/password: ?$/i',
-errmode => "return",
) ) {
$self->last_error("problem connecting to host (" . $self->host . "): " .
$self->lastline);
return undef;
}
$self->parse_login_banner($self->lastline);
$self->is_connected(1);
return $self->is_connected;
}
=pod
=item B<login>
- Login to the AP.
Calls open() if not already connected, then sends the password and sets
logged_in() if successful
=cut
sub login
{
my $self = shift;
unless ($self->is_connected) {
$self->open or return undef;
}
my $password = shift;
$self->print($password);
unless ($self->waitfor(
-match => $self->prompt,
-errmode => "return",
) ) {
$self->last_error("login ($self->host) failed: " . $self->lastline);
return undef;
}
$self->logged_in(1);
return $self->logged_in;
}
=pod
=item B<parse_login_banner>
- Converts the login_banner to some useful
variables.
Takes a login banner (what you get when you first connect to the Trango)
or reads what is already in login_banner() then parses it and sets
host_type() and firmware_version() as well as login_banner()
=cut
sub parse_login_banner
{
my $self = shift;
if (@_) {
$self->login_banner(@_);
}
my $banner = $self->login_banner;
my ($type, $sep1, $subtype, $sep2, $ver) = $banner =~
/Welcome to Trango Broadband Wireless (\S+)([\s-]+)(\S+)([\s-]+)(.+)$/i;
$type .= $sep1 . $subtype;
$ver = $subtype . $sep2 . $ver;
$self->login_banner($banner);
$self->host_type($type);
$self->firmware_version($ver);
return 1;
}
=pod
=item B<su_password>
- Set the password on SUs connected to the AP.
su_password('new_password'[, 'suid']) If no suid is specified,
the default is "all".
$t->su_password('good_pass', 5);
=cut
sub su_password
{
my $self = shift;
my $new_pass = shift || '';
my $su = shift || 'all';
unless (defined $new_pass) {
$self->last_error("No new password");
#return undef;
}
return $self->cmd(String => 'su password ' .
$su . ' ' .
$new_pass . ' ' .
$new_pass,
expect => $success,
);
}
=pod
=item B<su_ipconfig>
- Change IP configuration on SUs connected to
the AP.
su_ipconfig( 'suid', 'new_ip', 'new_subnet', 'new_gateway' )
$t->su_ipconfig( 5, '10.0.1.5', '255.255.255.0', '10.0.1.1' );
=cut
sub su_ipconfig
{
my $self = shift;
my $suid = shift;
my $new_ip = shift;
my $new_subnet = shift;
my $new_gateway = shift;
if ($suid =~ /\D/) {
$self->last_error("Invalid suid '$suid'");
return undef;
}
unless ($new_ip) {
$self->last_error("no new_ip passed");
return undef;
}
unless ($new_subnet) {
$self->last_error("no new_subnet passed");
return undef;
}
unless ($new_gateway) {
$self->last_error("no new_gateway passed");
return undef;
}
# su ipconfig <suid> <new ip> <new subnet> <new gateway>
return $self->cmd(String => 'su ipconfig ' .
$suid . ' ' .
$new_ip . ' ' .
$new_subnet . ' ' .
$new_gateway,
expect => $success,
);
}
=pod
=item B<sudb_view>
- Returns the output from the sudb view command
returns a reference to an array of hashes each containing these keys
'suid', 'type', 'cir', 'mir' and 'mac'
=cut
sub sudb_view
{
my $self = shift;
my @lines = $self->cmd( String => 'sudb view', expect => $success );
return undef unless @lines;
unless ($PRIVATE{'Decode'}) {
return \@lines;
}
my @sus;
foreach (@lines) {
next unless $_;
if (/^\[(\d+)\]\s+(\d+)\s+(\d+)\s+(\d+)\s+([0-9A-Fa-f\s]+)$/) {
my %s = (
suid => $1,
type => $2,
cir => $3,
mir => $4,
mac => $5,
);
$s{'mac'} =~ s/\s//g;
$s{'mac'} = uc($s{'mac'});
push @sus, \%s;
}
}
return \@sus;
}
=pod
=item B<sudb_add>
Takes the following paramaters
suid : numeric,
type : (reg|pr)
cir : numeric,
mir : numeric,
mac : Almost any format, it will be reformatted,
and returns true on success or undef otherwise.
$t->sudb_add($suid, 'reg', $cir, $mir, $mac);
You should save_sudb() after calling this, or your changes will be lost
when the AP is rebooted.
=cut
sub sudb_add
{
my $self = shift;
my $suid = shift;
my $type = shift;
my $cir = shift;
my $mir = shift;
my $mac = shift;
if ($suid =~ /\D/) {
$self->last_error("Invalid suid '$suid'");
return undef;
}
unless (lc($type) eq 'reg' || lc($type) eq 'pr') {
$self->last_error("Invalid type '$type'");
return undef;
}
if ($cir =~ /\D/) {
$self->last_error("Invalid CIR '$cir'");
return undef;
}
if ($mir =~ /\D/) {
$self->last_error("Invalid MIR '$mir'");
return undef;
}
my $new_mac = $mac;
$new_mac =~ s/[^0-9A-Fa-f]//;
unless (length $new_mac == 12) {
$self->last_error("Invalid MAC '$mac'");
return undef;
}
$new_mac = join ' ', $new_mac =~ /../g;
my $string = 'sudb add ' .
$suid . ' ' .
$type . ' ' .
$cir . ' ' .
$mir . ' ' .
$new_mac;
return $self->cmd( String => $string, expect => $success );
}
=pod
=item B<sudb_delete>
Takes either 'all' or the suid of the su to delete
and returns true on success or undef otherwise.
$t->sudb_delete($suid);
You should save_sudb() after calling this, or your changes will be lost
when the AP is rebooted.
=cut
sub sudb_delete
{
my $self = shift;
my $suid = shift;
#if (lc($suid) ne 'all' || $suid =~ /\D/) {
if ($suid =~ /\D/) {
$self->last_error("Invalid suid '$suid'");
return undef;
}
return $self->cmd( String => 'sudb delete ' . $suid, expect => $success );
}
=pod
=item B<sudb_modify>
Takes either the suid of the su to change
as well as what you are changing, either "cir, mir or su2su"
and returns true on success or undef otherwise.
cir and mir also take a value to set the cir/mir to.
su2su takes a group id parameter that is in hex.
$t->sudb_modify($suid, 'cir', 512);
You should save_sudb() after calling this, or your changes will be lost
when the AP is rebooted.
=cut
sub sudb_modify
{
my $self = shift;
my $suid = shift;
my $opt = shift;
my $value = shift;
if ($suid =~ /\D/) {
$self->last_error("Invalid suid '$suid'");
return undef;
}
if (lc($opt) eq 'cir' or lc($opt) eq 'mir') {
if ($value =~ /\D/) {
$self->last_error("Invalid $opt '$value'");
return undef;
}
} elsif (lc($opt) eq 'su2su') {
if ($value =~ /[^0-9A-Za-f]/) {
$self->last_error("Invalid MAC '$value'");
return undef;
}
} else {
$self->last_error("Invalid option '$opt'");
return undef;
}
my $string = 'sudb modify ' . $suid . ' ' . $opt . ' ' . $value;
return $self->cmd( String => $string, expect => $success );
}
=pod
=item B<enable_tftpd>
- enable the TFTP server
runs C<tftpd(args =E<gt> 'on')> and makes sure that Tftpd is now 'listen'ing
=cut
sub enable_tftpd
{
my $self = shift;
my $vals = $self->tftpd( args => 'on' );
if ($vals->{'Tftpd'} eq 'listen') {
return $vals;
} else {
return undef;
}
}
=pod
=item B<disable_tftpd>
- disable the TFTP server
runs C<tftpd(args =E<gt> 'off')> and makes sure that Tftpd is now 'disabled'
=cut
sub disable_tftpd
{
my $self = shift;
my $vals = $self->tftpd( args => 'off' );
if (ref $vals eq 'HASH' && $vals->{'Tftpd'} eq 'disabled') {
return $vals;
} else {
return undef;
}
}
=pod
=item B<cmd>
- runs a command on the AP.
This does most of the work. At the heart, it calls Net::Telnet::cmd()
but it also does some special stuff for Trango.
Normally returns the last lines from from the command
If you are using this, rather than one of the "easy" methods above,
you probably want to read through the source of this module to see how
some of the other commands are called.
In addition to the Net::Telnet::cmd() options, it also accepts these:
I<decode>
- if this is true, then it will send the output lines to _decode_lines()
and then returns the decoded output
I<no_prompt>
- if this is true, it does not wait for a prompt, so you are not stuck
waiting for something that will never happen.
I<cmd_disconnects>
- if this is true, it then sets logged_in() to false, then it will
close() the connection and set is_connected() to false
I<expect>
- if this is set (usually to 'Success.') it will check for that in the
last line of output and if it does not, will return undef because the
command probably failed
I<args>
- a string containing the command line options that are passed to the
command
$t->cmd( String => 'exit', no_prompt => 1, cmd_disconnects => 1 );
=cut
sub cmd
{
my $self = shift;
my @valid_net_telnet_opts = qw(
String
Output
Cmd_remove_mode
Errmode
Input_record_separator
Ors
Output_record_separator
Prompt
Rs
Timeout
);
my %cfg;
if (@_ == 1) {
$cfg{'String'} = shift;
} elsif (@_ > 1) {
%cfg = @_;
}
$cfg{'Timeout'} ||= $self->Timeout;
unless ($cfg{'String'}) {
$self->last_error("No command passed");
return undef;
}
unless ($self->is_connected) {
$self->last_error("Not connected");
return undef;
}
unless ($self->logged_in) {
$self->last_error("Not logged in");
return undef;
}
my %cmd;
foreach (@valid_net_telnet_opts) {
if (exists $cfg{$_}) {
$cmd{$_} = $cfg{$_};
}
}
if ($cfg{'args'}) {
$cmd{'String'} .= ' ' . $cfg{'args'};
}
my @lines;
unless ($cfg{'no_prompt'}) {
@lines = $self->SUPER::cmd(%cmd);
} else {
$self->print($cmd{'String'});
@lines = $self->lastline;
}
$self->last_lines(\@lines);
my $vals = 1;
if ($PRIVATE{'Decode'} && $cfg{'decode'}) {
if ($cfg{'decode'} eq 'each') {
$vals = _decode_each_line(@lines);
} elsif ($cfg{'decode'} eq 'sulog') {
$vals = _decode_sulog(@lines);
} elsif ($cfg{'decode'} eq 'maclist') {
$vals = _decode_maclist(@lines);
} else {
$vals = _decode_lines(@lines);
}
}
$self->last_vals($vals);
my $last = $self->lastline;
if ((not $cfg{'expect'}) || $last =~ /$cfg{'expect'}$/) {
if ($cfg{'cmd_disconnects'}) {
$self->logged_in(0);
$self->close;
$self->is_connected(0);
}
if ($PRIVATE{'Decode'} && $cfg{'decode'}) {
return $vals;
} else {
return \@lines;
}
} else {
$self->last_error("Error with command ($cfg{'String'}): $last");
return undef;
}
}
#=item _decode_lines
sub _decode_lines
{
my @lines = @_;
my %conf;
my $key = '';
my $val = undef;
my @vals;
my $in_key = 0;
my $in_val = 1;
foreach my $line (@lines) {
next if $line =~ /$success$/;
my @chars = split //, $line;
my $last_key = '';
foreach my $c (@chars) {
if ($c eq '[' || $c eq "\r" || $c eq "\n") {
if ($c eq '[') {
$in_key = 1;
$in_val = 0;
} else {
$in_key = 0;
$in_val = 1;
}
if ($key) {
$key =~ s/^\s+//;
$key =~ s/\s+$//;
if ($val) {
$val =~ s/^\s+//;
$val =~ s/\s+$//;
}
if ($key eq 'Checksum' && $last_key) {
# Special case for these bastids.
my $new = $last_key;
$new =~ s/\s+\S+$//;
$key = $new . " " . $key;
}
$conf{$key} = $val;
$last_key = $key;
$key = '';
} elsif ($val) {
push @vals, $val;
}
$val = '';
} elsif ($c eq ']') {
$in_val = 1;
$in_key = 0;
$c = shift @chars;
} elsif ($in_key) {
$key .= $c;
} elsif ($in_val) {
$val .= $c;
}
}
}
unless ($key) {
push @vals, $val;
}
if (@vals == 1) {
$val = $vals[0];
} elsif (@vals) {
$val= \@vals;
} else {
$val = undef;
}
if (%conf) {
$conf{_pre} = $val if $val;
return \%conf;
} else {
return $val;
}
}
#=item _decode_each_line
sub _decode_each_line
{
my @lines = @_;
my @decoded;
foreach my $line (@lines) {
my $decoded = _decode_lines($line);
push @decoded, $decoded if defined $decoded;
}
return \@decoded;
}
#=item _decode_sulog
sub _decode_sulog
{
my @lines = @_;
my @decoded;
my $last_tm;
foreach my $line (@lines) {
my $decoded = _decode_lines($line);
if (defined $decoded) {
if ($decoded->{'tm'}) {
$last_tm = $decoded->{'tm'};
next;
} else {
$decoded->{'tm'} = $last_tm;
}
next unless $last_tm;
push @decoded, $decoded if defined $decoded;
}
}
return \@decoded;
}
#=item _decode_maclist
sub _decode_maclist
{
my @lines = @_;
my @decoded;
my $total_entries = 0;
my $current_tm = 0;
foreach my $line (@lines) {
$line =~ s/\r?\n$//;
my ($mac, $loc, $tm) = $line =~ /
([0-9a-fA-F ]{17})\s+
(.*)\s+
tm\s+
(\d+)
/x;
if ($mac) {
$mac =~ s/\s+//g;
$loc =~ s/^\s+//;
$loc =~ s/\s+$//;
my $suid = undef;
if ($loc =~ /suid\s+=\s+(\d+)/) {
$suid = $1;
$loc = undef;
}
push @decoded, {
mac => $mac,
loc => $loc,
tm => $tm,
suid => $suid,
};
} elsif ($line =~ /(\d+)\s+entries/) {
$total_entries = $1;
} elsif ($line =~ /current tm = (\d+)\s+sec/) {
$current_tm = $1
}
}
map { $_->{'cur_tm'} = $current_tm } @decoded;
if (scalar @decoded == $total_entries) {
return \@decoded;
} else {
# XXX we should have a way to set last error, not sure why we don't
return undef;
}
}
1;
__END__
=back
=head1 SEE ALSO
Trango Documentation - http://www.trangobroadband.com/support/product_docs.htm
L<Net::Telnet>
=head1 TODO
There are still a lot of commands that are not accessed directly. If
you call them (as cmd("command + args") or whatever) and it works,
please send me examples that work and I will try to get it incorporated
into the next version of the script.
I also want to be able to parse the different types of output from
commands like su, sudb all and anything else that would be better
available as a perl datastructure.
=head1 AUTHOR
Andrew Fresh E<lt>andrew@rraz.netE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2005,2006,2007 by Andrew Fresh
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.7 or,
at your option, any later version of Perl 5 you may have available.
=cut
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