Net::Config - phpMan

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 AT remote.host
PASS pass

2
USER fwuser
PASS fwpass
USER user AT 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 AT remote.site
PASS pass@fwpass

6
USER fwuser AT remote.site
PASS fwpass
USER user
PASS pass

7
USER user AT 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 AT pobox.com <mailto:gbarr AT pobox.com>>.

Steve Hay <shay AT cpan.org <mailto:shay AT cpan.org>> is now maintaining libnet as of version
1.22_02.

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 3.13

DATE
23 Dec 2020

HISTORY
See the Changes file.

perl v5.34.0 2023-11-23 Net::Config(3perl)

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