Net::Config(3perl) Perl Programmers Reference Guide Net::Config(3perl)
NAME
Net::Config - Local configuration data for libnet
SYNOPSIS
use Net::Config qw(%NetConfig);
DESCRIPTION
"Net::Config" holds configuration data for the modules in the libnet
distribution. During installation you will be asked for these values.
The configuration data is held globally in "/etc/perl/Net/libnet.cfg",
but a user may override any of these values by providing their own. This
can be done by having a ".libnetrc" file in their home directory. This
file should return a reference to a HASH containing the keys described
below. For example
# .libnetrc
{
nntp_hosts => [ "my_preferred_host" ],
ph_hosts => [ "my_ph_server" ],
}
__END__
Class Methods
"Net::Config" defines the following methods. They are methods as they
are invoked as class methods. This is because "Net::Config" inherits
from "Net::LocalCfg" so you can override these methods if you want.
requires_firewall($host)
Attempts to determine if a given host is outside your firewall.
Possible return values are.
-1 Cannot lookup hostname
0 Host is inside firewall (or there is no ftp_firewall entry)
1 Host is outside the firewall
This is done by using hostname lookup and the "local_netmask" entry
in the configuration data.
NetConfig Values
nntp_hosts
snpp_hosts
pop3_hosts
smtp_hosts
ph_hosts
daytime_hosts
time_hosts
Each is a reference to an array of hostnames (in order of
preference), which should be used for the given protocol
inet_domain
Your internet domain name
ftp_firewall
If you have an FTP proxy firewall (NOT an HTTP or SOCKS firewall)
then this value should be set to the firewall hostname. If your
firewall does not listen to port 21, then this value should be set
to "hostname:port" (eg "hostname:99")
ftp_firewall_type
There are many different ftp firewall products available. But
unfortunately there is no standard for how to traverse a firewall.
The list below shows the sequence of commands that Net::FTP will use
user Username for remote host
pass Password for remote host
fwuser Username for firewall
fwpass Password for firewall
remote.host The hostname of the remote ftp server
0 There is no firewall
1
USER user@remote.host
PASS pass
2
USER fwuser
PASS fwpass
USER user@remote.host
PASS pass
3
USER fwuser
PASS fwpass
SITE remote.site
USER user
PASS pass
4
USER fwuser
PASS fwpass
OPEN remote.site
USER user
PASS pass
5
USER user@fwuser@remote.site
PASS pass@fwpass
6
USER fwuser@remote.site
PASS fwpass
USER user
PASS pass
7
USER user@remote.host
PASS pass
AUTH fwuser
RESP fwpass
ftp_ext_passive
ftp_int_passive
FTP servers can work in passive or active mode. Active mode is when
you want to transfer data you have to tell the server the address
and port to connect to. Passive mode is when the server provide the
address and port and you establish the connection.
With some firewalls active mode does not work as the server cannot
connect to your machine (because you are behind a firewall) and the
firewall does not re-write the command. In this case you should set
"ftp_ext_passive" to a true value.
Some servers are configured to only work in passive mode. If you
have one of these you can force "Net::FTP" to always transfer in
passive mode; when not going via a firewall, by setting
"ftp_int_passive" to a true value.
local_netmask
A reference to a list of netmask strings in the form
"134.99.4.0/24". These are used by the "requires_firewall" function
to determine if a given host is inside or outside your firewall.
The following entries are used during installation & testing on the
libnet package
test_hosts
If true then "make test" may attempt to connect to hosts given in
the configuration.
test_exists
If true then "Configure" will check each hostname given that it
exists
EXPORTS
The following symbols are, or can be, exported by this module:
Default Exports
%NetConfig.
Optional Exports
None.
Export Tags
None.
KNOWN BUGS
None.
AUTHOR
Graham Barr <gbarr@pobox.com <mailto:gbarr@pobox.com>>.
Steve Hay <shay@cpan.org <mailto:shay@cpan.org>> is now maintaining
libnet as of version 1.22_02.
COPYRIGHT
Copyright (C) 2000 Graham Barr. All rights reserved.
Copyright (C) 2013-2014, 2016, 2020 Steve Hay. All rights reserved.
LICENCE
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, i.e. under the terms of either the
GNU General Public License or the Artistic License, as specified in the
LICENCE file.
VERSION
Version 3.15
DATE
20 March 2023
HISTORY
See the Changes file.
perl v5.40.1 2026-08-30 Net::Config(3perl)
Generated by dwww version 1.16 on Sat Oct 3 06:02:47 CEST 2026.