package Win32::NetResource;

require Exporter;
require DynaLoader;
require AutoLoader;

$VERSION = '0.055';

@ISA = qw(Exporter DynaLoader);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
@EXPORT = qw(
    RESOURCEDISPLAYTYPE_DOMAIN
    RESOURCEDISPLAYTYPE_FILE
    RESOURCEDISPLAYTYPE_GENERIC
    RESOURCEDISPLAYTYPE_GROUP
    RESOURCEDISPLAYTYPE_SERVER
    RESOURCEDISPLAYTYPE_SHARE
    RESOURCEDISPLAYTYPE_TREE
    RESOURCETYPE_ANY
    RESOURCETYPE_DISK
    RESOURCETYPE_PRINT
    RESOURCETYPE_UNKNOWN
    RESOURCEUSAGE_CONNECTABLE
    RESOURCEUSAGE_CONTAINER
    RESOURCEUSAGE_RESERVED
    RESOURCE_CONNECTED
    RESOURCE_GLOBALNET
    RESOURCE_REMEMBERED
    STYPE_DISKTREE
    STYPE_PRINTQ
    STYPE_DEVICE
    STYPE_IPC
    STYPE_SPECIAL
    SHARE_NETNAME_PARMNUM
    SHARE_TYPE_PARMNUM
    SHARE_REMARK_PARMNUM
    SHARE_PERMISSIONS_PARMNUM
    SHARE_MAX_USES_PARMNUM
    SHARE_CURRENT_USES_PARMNUM
    SHARE_PATH_PARMNUM
    SHARE_PASSWD_PARMNUM
    SHARE_FILE_SD_PARMNUM
);

@EXPORT_OK = qw(
    GetSharedResources
    AddConnection
    CancelConnection
    WNetGetLastError
    GetError
    GetUNCName
    NetShareAdd
    NetShareCheck
    NetShareDel
    NetShareGetInfo
    NetShareSetInfo
);

=head1 NAME

Win32::NetResource - Manage network resources in Perl

=head1 SYNOPSIS

    use Win32::NetResource;

    $ShareInfo = {
                    'path' => "C:\\MyShareDir",
                    'netname' => "MyShare",
                    'remark' => "It is good to share",
                    'passwd' => "",
                    'current-users' =>0,
                    'permissions' => 0,
                    'maxusers' => -1,
                    'type'  => 0,
                    };
    
    Win32::NetResource::NetShareAdd( $ShareInfo,$parm )
        or die "unable to add share";


=head1 DESCRIPTION

This module offers control over the network resources of Win32.Disks,
printers etc can be shared over a network.

=head1 DATA TYPES

There are two main data types required to control network resources.
In Perl these are represented by hash types.

=over 4

=item %NETRESOURCE

    KEY                    VALUE
    
    'Scope'         =>  Scope of an Enumeration
			RESOURCE_CONNECTED,
			RESOURCE_GLOBALNET,
			RESOURCE_REMEMBERED.
    
    'Type'          =>  The type of resource to Enum
			RESOURCETYPE_ANY    All resources
			RESOURCETYPE_DISK    Disk resources
			RESOURCETYPE_PRINT    Print resources
    
    'DisplayType'   =>  The way the resource should be displayed.
			RESOURCEDISPLAYTYPE_DOMAIN    
			The object should be displayed as a domain.
			RESOURCEDISPLAYTYPE_GENERIC    
			The method used to display the object does not matter.
			RESOURCEDISPLAYTYPE_SERVER    
			The object should be displayed as a server.
			RESOURCEDISPLAYTYPE_SHARE    
			The object should be displayed as a sharepoint.
    
    'Usage'         =>  Specifies the Resources usage:
			RESOURCEUSAGE_CONNECTABLE
			RESOURCEUSAGE_CONTAINER.
    
    'LocalName'     =>  Name of the local device the resource is 
			connected to.
    
    'RemoteName'    =>  The network name of the resource.
    
    'Comment'       =>  A string comment.
    
    'Provider'      =>  Name of the provider of the resource.

=back    

=item %SHARE_INFO

This hash represents the SHARE_INFO_502 struct.

=over 4

    KEY                    VALUE
    'netname'        =>    Name of the share.
    'type'           =>    type of share.
    'remark'         =>    A string comment.
    'permissions'    =>    Permissions value
    'maxusers'       =>    the max # of users.
    'current-users'  =>    the current # of users.
    'path'           =>    The path of the share.
    'passwd'         =>    A password if one is req'd

=back

=head1 FUNCTIONS

=head2 NOTE

All of the functions return false if they fail.

=over 4

=item GetSharedResources(\@Resources,dwType,\%NetResource = NULL)

Creates a list in @Resources of %NETRESOURCE hash references.

The return value indicates whether there was an error in accessing
any of the shared resources.  All the shared resources that were
encountered (until the point of an error, if any) are pushed into
@Resources as references to %NETRESOURCE hashes.  See example
below.  The \%NetResource argument is optional.  If it is not supplied,
the root (that is, the topmost container) of the network is assumed,
and all network resources available from the toplevel container will
be enumerated.

=item AddConnection(\%NETRESOURCE,$Password,$UserName,$Connection)

Makes a connection to a network resource specified by %NETRESOURCE

=item CancelConnection($Name,$Connection,$Force)

Cancels a connection to a network resource connected to local device 
$name.$Connection is either 1 - persistent connection or 0, non-persistent.

=item WNetGetLastError($ErrorCode,$Description,$Name)

Gets the Extended Network Error.

=item GetError( $ErrorCode )

Gets the last Error for a Win32::NetResource call.

=item GetUNCName( $UNCName, $LocalPath );

Returns the UNC name of the disk share connected to $LocalPath in $UNCName.
$LocalPath should be a drive based path. e.g. "C:\\share\\subdir"

=back

=head2 NOTE

$servername is optional for all the calls below. (if not given the
local machine is assumed.)

=over 4

=item NetShareAdd(\%SHARE,$parm_err,$servername = NULL )

Add a share for sharing.

=item NetShareCheck($device,$type,$servername = NULL )

Check if a directory or a device is available for connection from the
network through a share.  This includes all directories that are
reachable through a shared directory or device, meaning that if C:\foo
is shared, C:\foo\bar is also available for sharing.  This means that
this function is pretty useless, given that by default every disk
volume has an administrative share such as "C$" associated with its
root directory.

$device must be a drive name, directory, or a device.  For example,
"C:", "C:\dir", "LPT1", "D$", "IPC$" are all valid as the $device
argument.  $type is an output argument that will be set to one of
the following constants that describe the type of share:

    STYPE_DISKTREE     Disk drive 
    STYPE_PRINTQ       Print queue 
    STYPE_DEVICE       Communication device 
    STYPE_IPC          Interprocess communication (IPC) 
    STYPE_SPECIAL      Special share reserved for interprocess
                         communication (IPC$) or remote administration
                         of the server (ADMIN$). Can also refer to
                         administrative shares such as C$, D$, etc.

=item NetShareDel( $netname, $servername = NULL )

Remove a share from a machines list of shares.

=item NetShareGetInfo( $netname, \%SHARE,$servername=NULL )

Get the %SHARE_INFO information about the share $netname on the
server $servername.

=item NetShareSetInfo( $netname,\%SHARE,$parm_err,$servername=NULL)

Set the information for share $netname.

=back

=head1 EXAMPLE

=over 4

=item Enumerating all resources on the network

    #
    # This example displays all the share points in the entire
    # visible part of the network.
    #

    use strict;
    use Win32::NetResource qw(:DEFAULT GetSharedResources GetError);
    my $resources = [];
    unless(GetSharedResources($resources, RESOURCETYPE_ANY)) {
	my $err;
	GetError($err);
	warn Win32::FormatMessage($err);
    }

    foreach my $href (@$resources) {
	next if ($$href{DisplayType} != RESOURCEDISPLAYTYPE_SHARE);
	print "-----\n";
	foreach( keys %$href){
	    print "$_: $href->{$_}\n";
	}
    }

=item Enumerating all resources on a particular host

    #
    # This example displays all the share points exported by the local
    # host.
    #

    use strict;
    use Win32::NetResource qw(:DEFAULT GetSharedResources GetError);
    if (GetSharedResources(my $resources, RESOURCETYPE_ANY,
			   { RemoteName => "\\\\" . Win32::NodeName() }))
    {
	foreach my $href (@$resources) {
	    print "-----\n";
	    foreach(keys %$href) { print "$_: $href->{$_}\n"; }
	}
    }

=back

=head1 AUTHOR

Jesse Dougherty for Hip Communications.

Additional general cleanups and bug fixes by Gurusamy Sarathy <gsar@cpan.org>.

=cut

sub AUTOLOAD {
    # This AUTOLOAD is used to 'autoload' constants from the constant()
    # XS function.  If a constant is not found then control is passed
    # to the AUTOLOAD in AutoLoader.

    my($constname);
    ($constname = $AUTOLOAD) =~ s/.*:://;
    #reset $! to zero to reset any current errors.
    local $! = 0;
    my $val = constant($constname, @_ ? $_[0] : 0);
    if ($! != 0) {
        if ($! =~ /Invalid/) {
            $AutoLoader::AUTOLOAD = $AUTOLOAD;
            goto &AutoLoader::AUTOLOAD;
        }
        else {
            ($pack,$file,$line) = caller;
            die "Your vendor has not defined Win32::NetResource macro $constname, used at $file line $line.
";
        }
    }
    eval "sub $AUTOLOAD { $val }";
    goto &$AUTOLOAD;
}

sub AddConnection
{
    my $h = $_[0];
    die "AddConnection: HASH reference required" unless ref($h) eq "HASH";

    #
    # The last four items *must* not be deallocated until the
    # _AddConnection() completes (since the packed structure is
    # pointing into these values.
    #
    my $netres = pack( 'i4 p4', $h->{Scope},
    				$h->{Type},
				$h->{DisplayType},
				$h->{Usage},
				$h->{LocalName},
				$h->{RemoteName},
				$h->{Comment},
				$h->{Provider});
    _AddConnection($netres,$_[1],$_[2],$_[3]);
}

#use Data::Dumper;

sub GetSharedResources
{
    die "GetSharedResources: ARRAY reference required"
	if defined $_[0] and ref($_[0]) ne "ARRAY";

    my $aref = [];

    # Get the shared resources.

    my $ret;

    if (@_ > 2 and $_[2]) {
	my $netres = pack('i4 p4', @{$_[2]}{qw(Scope
					       Type
					       DisplayType
					       Usage
					       LocalName
					       RemoteName
					       Comment
					       Provider)});
	$ret = _GetSharedResources( $aref , $_[1], $netres );
    }
    else {
	$ret = _GetSharedResources( $aref , $_[1] );
    }
    
    # build the array of hashes in $_[0]
#   print Dumper($aref);    
    foreach ( @$aref ) {
	my %hash;
	@hash{'Scope',
	      'Type',
	      'DisplayType',
	      'Usage',
	      'LocalName',
	      'RemoteName',
	      'Comment',
	      'Provider'} = split /\001/, $_;
	push @{$_[0]}, \%hash;
    }

    $ret;
}

sub NetShareAdd
{
    my $shareinfo = _hash2SHARE( $_[0] );
    _NetShareAdd($shareinfo,$_[1], $_[2] || "");
}

sub NetShareGetInfo
{
    my ($netinfo,$val);
    $val = _NetShareGetInfo( $_[0],$netinfo,$_[2] || "");
    %{$_[1]} = %{_SHARE2hash( $netinfo )};    
    $val;
}

sub NetShareSetInfo
{
    my $shareinfo = _hash2SHARE( $_[1] );
    _NetShareSetInfo( $_[0],$shareinfo,$_[2],$_[3] || "");
}


# These are private functions to work with the ShareInfo structure.
# please note that the implementation of these calls requires the
# SHARE_INFO_502 level of information.

sub _SHARE2hash
{
    my %hash = ();
    @hash{'type',
          'permissions',
          'maxusers',
          'current-users',
          'remark',
          'netname',
          'path',
          'passwd'} = unpack('i4 A257 A81 A257 A257',$_[0]);

    return \%hash;
}

sub _hash2SHARE
{
    my $h = $_[0];
    die "Argument must be a HASH reference" unless ref($h) eq "HASH";

    return pack 'i4 a257 a81 a257 a257',
		 @$h{'type',
		    'permissions',
		    'maxusers',
		    'current-users',
		    'remark',
		    'netname',
		    'path',
		    'passwd'};
}


bootstrap Win32::NetResource;

1;
__END__
