-- Perl 5.8.7 documentation --


Net::Config - Local configuration data for libnet


    use Net::Config qw(%NetConfig);


Net::Config holds configuration data for the modules in the libnet distribuion. During installation you will be asked for these values.

The configuration data is held globally in a file in the perl installation tree, 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_prefered_host" ],
	ph_hosts   => [ "my_ph_server" ],


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

      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_pasive

    FTP servers normally work on a non-passive mode. That is when you want to transfer data you have to tell the server the address and port to connect to.

    With some firewalls this 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 "" . 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

$Id: //depot/libnet/Net/Config.pm#17 $