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# Net::Config.pm # # Copyright (c) 2000 Graham Barr <gbarr@pobox.com>. All rights reserved. # This program is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. package Net::Config; require Exporter; use vars qw(@ISA @EXPORT %NetConfig $VERSION $CONFIGURE $LIBNET_CFG); use Socket qw(inet_aton inet_ntoa); use strict; @EXPORT = qw(%NetConfig); @ISA = qw(Net::LocalCfg Exporter); $VERSION = "1.11"; eval { local $SIG{__DIE__}; require Net::LocalCfg }; %NetConfig = ( nntp_hosts => [], snpp_hosts => [], pop3_hosts => [], smtp_hosts => [], ph_hosts => [], daytime_hosts => [], time_hosts => [], inet_domain => undef, ftp_firewall => undef, ftp_ext_passive => 1, ftp_int_passive => 1, test_hosts => 0, test_exist => 1, ); # # Try to get as much configuration info as possible from InternetConfig # $^O eq 'MacOS' and eval <<TRY_INTERNET_CONFIG; use Mac::InternetConfig; { my %nc = ( nntp_hosts => [ \$InternetConfig{ kICNNTPHost() } ], pop3_hosts => [ \$InternetConfig{ kICMailAccount() } =~ /\@(.*)/ ], smtp_hosts => [ \$InternetConfig{ kICSMTPHost() } ], ftp_testhost => \$InternetConfig{ kICFTPHost() } ? \$InternetConfig{ kICFTPHost()} : undef, ph_hosts => [ \$InternetConfig{ kICPhHost() } ], ftp_ext_passive => \$InternetConfig{"646F676F\xA5UsePassiveMode"} || 0, ftp_int_passive => \$InternetConfig{"646F676F\xA5UsePassiveMode"} || 0, socks_hosts => \$InternetConfig{ kICUseSocks() } ? [ \$InternetConfig{ kICSocksHost() } ] : [], ftp_firewall => \$InternetConfig{ kICUseFTPProxy() } ? [ \$InternetConfig{ kICFTPProxyHost() } ] : [], ); \@NetConfig{keys %nc} = values %nc; } TRY_INTERNET_CONFIG my $file = __FILE__; my $ref; $file =~ s/Config.pm/libnet.cfg/; if (-f $file) { $ref = eval { local $SIG{__DIE__}; do $file }; if (ref($ref) eq 'HASH') { %NetConfig = (%NetConfig, %{$ref}); $LIBNET_CFG = $file; } } if ($< == $> and !$CONFIGURE) { my $home = eval { local $SIG{__DIE__}; (getpwuid($>))[7] } || $ENV{HOME}; $home ||= $ENV{HOMEDRIVE} . ($ENV{HOMEPATH} || '') if defined $ENV{HOMEDRIVE}; if (defined $home) { $file = $home . "/.libnetrc"; $ref = eval { local $SIG{__DIE__}; do $file } if -f $file; %NetConfig = (%NetConfig, %{$ref}) if ref($ref) eq 'HASH'; } } my ($k, $v); while (($k, $v) = each %NetConfig) { $NetConfig{$k} = [$v] if ($k =~ /_hosts$/ and $k ne "test_hosts" and defined($v) and !ref($v)); } # Take a hostname and determine if it is inside the firewall sub requires_firewall { shift; # ignore package my $host = shift; return 0 unless defined $NetConfig{'ftp_firewall'}; $host = inet_aton($host) or return -1; $host = inet_ntoa($host); if (exists $NetConfig{'local_netmask'}) { my $quad = unpack("N", pack("C*", split(/\./, $host))); my $list = $NetConfig{'local_netmask'}; $list = [$list] unless ref($list); foreach (@$list) { my ($net, $bits) = (m#^(\d+\.\d+\.\d+\.\d+)/(\d+)$#) or next; my $mask = ~0 << (32 - $bits); my $addr = unpack("N", pack("C*", split(/\./, $net))); return 0 if (($addr & $mask) == ($quad & $mask)); } return 1; } return 0; } use vars qw(*is_external); *is_external = \&requires_firewall; 1; __END__ =head1 NAME Net::Config - Local configuration data for libnet =head1 SYNOPSYS use Net::Config qw(%NetConfig); =head1 DESCRIPTION C<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 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 C<.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__ =head1 METHODS C<Net::Config> defines the following methods. They are methods as they are invoked as class methods. This is because C<Net::Config> inherits from C<Net::LocalCfg> so you can override these methods if you want. =over 4 =item 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 C<local_netmask> entry in the configuration data. =back =head1 NetConfig VALUES =over 4 =item nntp_hosts =item snpp_hosts =item pop3_hosts =item smtp_hosts =item ph_hosts =item daytime_hosts =item time_hosts Each is a reference to an array of hostnames (in order of preference), which should be used for the given protocol =item inet_domain Your internet domain name =item ftp_firewall If you have an FTP proxy firewall (B<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 C<"hostname:port"> (eg C<"hostname:99">) =item 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 =over 4 =item 0 There is no firewall =item 1 USER user@remote.host PASS pass =item 2 USER fwuser PASS fwpass USER user@remote.host PASS pass =item 3 USER fwuser PASS fwpass SITE remote.site USER user PASS pass =item 4 USER fwuser PASS fwpass OPEN remote.site USER user PASS pass =item 5 USER user@fwuser@remote.site PASS pass@fwpass =item 6 USER fwuser@remote.site PASS fwpass USER user PASS pass =item 7 USER user@remote.host PASS pass AUTH fwuser RESP fwpass =back =item ftp_ext_passive =item 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 C<ftp_ext_passive> to a I<true> value. Some servers are configured to only work in passive mode. If you have one of these you can force C<Net::FTP> to always transfer in passive mode; when not going via a firewall, by setting C<ftp_int_passive> to a I<true> value. =item local_netmask A reference to a list of netmask strings in the form C<"134.99.4.0/24">. These are used by the C<requires_firewall> function to determine if a given host is inside or outside your firewall. =back The following entries are used during installation & testing on the libnet package =over 4 =item test_hosts If true then C<make test> may attempt to connect to hosts given in the configuration. =item test_exists If true then C<Configure> will check each hostname given that it exists =back =cut