1 files changed, 205 insertions, 0 deletions
diff --git a/Net/Config.pm b/Net/Config.pm
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+++ b/Net/Config.pm
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+package Net::Config;
+
+require Exporter;
+use vars qw(@ISA @EXPORT %NetConfig $VERSION $CONFIGURE $LIBNET_CFG);
+use strict;
+
+@EXPORT  = qw(%NetConfig);
+@ISA     = qw(Net::LocalCfg Exporter);
+$VERSION = "1.00";
+
+eval { 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 => 0,
+    ftp_int_passive => 0,
+    test_hosts => 1,
+    test_exist => 1,
+);
+
+my $file = __FILE__;
+my $ref;
+$file =~ s/Config.pm/libnet.cfg/;
+if ( -f $file ) {
+    $ref = eval { do $file };
+    if (ref($ref) eq 'HASH') {
+        %NetConfig = (%NetConfig, %{ $ref });
+        $LIBNET_CFG = $file;
+    }
+}
+if ($< == $> and !$CONFIGURE)  {
+    my $home = eval { (getpwuid($>))[7] } || $ENV{HOME};
+    $file = $home . "/.libnetrc";
+    $ref = eval { do $file } if -f $file;
+    %NetConfig = (%NetConfig, %{ $ref })
+        if ref($ref) eq 'HASH';        
+}
+my ($k,$v);
+while(($k,$v) = each %NetConfig) {
+    $v = [ $v ]
+        if($k =~ /_hosts$/ && !ref($v));
+}
+
+# Take a hostname and determine if it is inside te firewall
+sub is_external {
+    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 $addr = unpack("N",pack("C*",split(".",$host)));
+
+            return 0 if (($addr & $mask) == ($quad & $mask));
+        }
+        return 1;
+    }
+
+    return 0;
+}
+
+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
+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 thier own. This
+can be done by having a C<.libnetrc> file in thier 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" ],
+    }
+    __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 is_external 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 not ftp_firewall entry)
+   1  Host is outside the firewall
+
+This is done by using hostanme 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> a 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_ext_passive
+
+=item 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 te server cannot
+connect to your machine (because you are beind a firewall) and the firewall
+does not re-write te 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 cetting 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<is_external> 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 them C<make test> may attempt to connect to hosts given in the
+configuration.
+
+=item test_exists
+
+If true the C<Configure> will check each hostname given that it exists
+
+=back
+
+=cut