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Net::Config(3pm)		 Perl Programmers Reference Guide		 Net::Config(3pm)

       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

	     -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 configura-
	   tion data.

NetConfig VALUES
	   Each is a reference to an array of hostnames (in order of preference), which should be
	   used for the given protocol

	   Your internet domain name

	   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")

	   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 com-
	   mands 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

		    USER user@remote.host
		    PASS pass

		    USER fwuser
		    PASS fwpass
		    USER user@remote.host
		    PASS pass

		    USER fwuser
		    PASS fwpass
		    SITE remote.site
		    USER user
		    PASS pass

		    USER fwuser
		    PASS fwpass
		    OPEN remote.site
		    USER user
		    PASS pass

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

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

		    USER user@remote.host
		    PASS pass
		    AUTH fwuser
		    RESP fwpass

	   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 fire-
	   wall, by setting "ftp_int_passive" to a true value.

	   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

	   If true then "make test" may attempt to connect to hosts given in the configuration.

	   If true then "Configure" will check each hostname given that it exists

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

perl v5.8.0				    2002-06-01				 Net::Config(3pm)
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