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.\" ========================================================================
.\"
.IX Title "Safe::Hole 3"
.TH Safe::Hole 3 "2010-05-17" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Safe::Hole \- make a hole to the original main compartment in the Safe compartment
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 16
\&  use Safe;
\&  use Safe::Hole;
\&  $cpt = new Safe;
\&  $hole = new Safe::Hole {};
\&  sub test { Test->test; }
\&  $Testobj = new Test;
\&  # $cpt->share('&test');  # alternate as next line
\&  $hole->wrap(\e&test, $cpt, '&test');
\&  # ${$cpt->varglob('Testobj')} = $Testobj;  # alternate as next line
\&  $hole->wrap($Testobj, $cpt, '$Testobj');
\&  $cpt->reval('test; $Testobj->test;'); 
\&  print $@ if $@;
\&  package Test;
\&  sub new { bless {},shift(); }
\&  sub test { my $self = shift; $self->test2; }
\&  sub test2 { print "Test->test2 called\en"; }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.Vb 7
\&  We can call outside defined subroutines from the Safe compartment
\&using share(), or can call methods through the object that is copied
\&into the Safe compartment using varglob(). But that subroutines or
\&methods are executed in the Safe compartment too, so they cannot call
\&another subroutines that are dinamically qualified with the package
\&name such as class methods nor can they compile code that uses opcodes
\&that are forbidden within the compartment.
.Ve
.PP
.Vb 2
\&  Through Safe::Hole, we can execute outside defined subroutines in the 
\&original main compartment from the Safe compartment.
.Ve
.PP
.Vb 4
\&  Note that if a subroutine called through Safe::Hole::call does a
\&Carp::croak() it will report the error as having occured within
\&Safe::Hole.  This can be avoided by including Safe::Hole::User in the
\&@ISA for the package containing the subroutine.
.Ve
.Sh "Methods"
.IX Subsection "Methods"
.IP "new [\s-1NAMESPACE\s0]" 4
.IX Item "new [NAMESPACE]"
Class method. Backward compatible constructor.
  \s-1NAMESPACE\s0 is the alternate root namespace that makes the compartment
in which \fIcall()\fR method execute the subroutine.  Default of \s-1NAMESPACE\s0
means the current 'main'. This emulates the behaviour of
Safe\-Hole\-0.08 and earlier.
.IP "new \e%arguments" 4
.IX Item "new %arguments"
Class method. Constructor. 
  The constructor is called with a hash reference providing the
constructor arguments.  The argument \s-1ROOT\s0 specifies the alternate root
namespace for the object.  If the \s-1ROOT\s0 argument is not specified then
Safe::Hole object will attempt restore as much as it can of the
environment in which it was constrtucted.  This includes the opcode
mask, \f(CW%INC\fR and \f(CW@INC\fR.  If a root namespace is specified then it
would not make sense to restore the \f(CW%INC\fR and \f(CW@INC\fR from main:: so this
is not done.  Also if a root namespace is given the opcode mask is not
restored either.
.ie n .IP "call $coderef [,@args]" 4
.el .IP "call \f(CW$coderef\fR [,@args]" 4
.IX Item "call $coderef [,@args]"
Object method. 
  Call the subroutine refered by \f(CW$coderef\fR in the compartment that is
specified with constructor new. \f(CW@args\fR are passed as the arguments to
the called \f(CW$coderef\fR.  Note that the arguments are not currently passed
by reference although this may change in a future version.
.ie n .IP "wrap $ref [,$cpt ,$name]" 4
.el .IP "wrap \f(CW$ref\fR [,$cpt ,$name]" 4
.IX Item "wrap $ref [,$cpt ,$name]"
Object method. 
  If \f(CW$ref\fR is a code reference, this method returns the anonymous 
subroutine reference that calls \f(CW$ref\fR using \fIcall()\fR method of Safe::Hole (see 
above). 
  If \f(CW$ref\fR is a class object, this method makes a wrapper class of that object 
and returns a new object of the wrapper class. Through the wrapper class, 
all original class methods called using \fIcall()\fR method of Safe::Hole.
  If \f(CW$cpt\fR as Safe object and \f(CW$name\fR as subroutine or scalar name specified, 
this method works like \fIshare()\fR method of Safe. When \f(CW$ref\fR is a code reference
\&\f(CW$name\fR must like '&subroutine'. When \f(CW$ref\fR is a object \f(CW$name\fR must like '$var'.
  Name \f(CW$name\fR may not be same as referent of \f(CW$ref\fR. For example:
  \f(CW$hole\fR\->wrap(\e&foo, \f(CW$cpt\fR, '&bar');
  \f(CW$hole\fR\->wrap(sub{...}, \f(CW$cpt\fR, '&foo');
  \f(CW$hole\fR\->wrap($objfoo, \f(CW$cpt\fR, '$objbar');
.IP "root" 4
.IX Item "root"
Object method.
Return the namespace that is specified with constructor \fInew()\fR.
If no namespace was then \fIroot()\fR returns 'main'.
.Sh "Warning"
.IX Subsection "Warning"
You \s-1MUST\s0 \s-1NOT\s0 share the Safe::Hole object with the Safe compartment. If you do it
the Safe compartment is \s-1NOT\s0 safe.
.PP
This module provides a means to go from a state where an opcode is
denied back to a state where it is not.  Reasonable care has been
taken to ensure that programs cannot simply manipulate the internals
to the Safe::Hole object to reduce the opmask in effect.  However there
may still be a way that the authors have not considered.  In
particular it relies on the fact that a Perl program cannot change
stuff inside the magic on a Perl variable.  If you install a module
that allows a Perl program to fiddle inside the magic then this
assuption breaks down.  One would hope that any system that was
running un-trusted code would not have such a module installed.
.SH "AUTHORS"
.IX Header "AUTHORS"
Sey Nakajima <nakajima@netstock.co.jp> (Initial version)
.PP
Brian McCauley <nobull@cpan.org> (Maintenance)
.PP
Todd Rinaldo <toddr@cpan.org> (Maintenance)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fISafe\fR\|(3).