mDNSResponder-765.50.9.tar.gz

[apple/mdnsresponder.git] / mDNSMacOSX / PreferencePane / installtool

#!/usr/bin/perl
# Emacs settings: -*- tab-width: 4 -*-
#
# File: installtool
# 
# Abstract: Copy "ddnswriteconfig" to Application Support and make it setuid root.
# 
# Copyright: (c) Copyright 2005 Apple Computer, Inc. All rights reserved.
# 
# Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
# ("Apple") in consideration of your agreement to the following terms, and your
# use, installation, modification or redistribution of this Apple software
# constitutes acceptance of these terms.  If you do not agree with these terms,
# please do not use, install, modify or redistribute this Apple software.
# 
# In consideration of your agreement to abide by the following terms, and subject
# to these terms, Apple grants you a personal, non-exclusive license, under Apple's
# copyrights in this original Apple software (the "Apple Software"), to use,
# reproduce, modify and redistribute the Apple Software, with or without
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# this notice and the following text and disclaimers in all such redistributions of
# the Apple Software.  Neither the name, trademarks, service marks or logos of
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# Apple Software without specific prior written permission from Apple.  Except as
# expressly stated in this notice, no other rights or licenses, express or implied,
# are granted by Apple herein, including but not limited to any patent rights that
# may be infringed by your derivative works or by other works in which the Apple
# Software may be incorporated.
# 
# The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
# WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
# WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
# COMBINATION WITH YOUR PRODUCTS.
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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#
# Create the Bonjour subdirectory.
# Copy ARGV[0] to $dest and set owner and suid permissions.
#
# This script will be run as root by the AEWP trampoline.
#

use File::Temp qw/ :mktemp /;

$dest_dir = "/Library/Application Support/Bonjour";
$dest = $dest_dir . "/ddnswriteconfig";

$template = ".XXXXXX";

# Perl seems to think this code is running setuid root, so it applies its security checks.
# See <http://www.monster-submit.com/resources/docs/pod/perlsec.html>.
# In fact this is NOT a setuid script. It is a normal unprivileged user-level script --
# but it is run as root when properly authorized by a user with an admin password,
# via the AuthorizationExecuteWithPrivileges() call.
# We therefore have to do this trick pattern match to 'untaint' the source file specified in $ARGV[0].
if ($ARGV[0] =~ /^(.+)$/) { $src = $1; }

# Also clear $ENV{PATH} so we don't get "Insecure $ENV{PATH}" fatal errors
$ENV{PATH} = "";

if (! -d $dest_dir) {
   $dest_tmp_dir = mkdtemp ($dest_dir . $template);
   (chown 0, 80, $dest_tmp_dir) or cleanup_dir();
   (chmod 0755, $dest_tmp_dir) or cleanup_dir();
   (rename $dest_tmp_dir, $dest_dir) or cleanup_dir();
}

$dest_tmp = mktemp ($dest . $template);

if ($src ne '') {
   system ('/bin/cp', '-f', $src, $dest_tmp) and cleanup();
   (chown 0, 80, $dest_tmp) or cleanup();
   (chmod 04555, $dest_tmp) or cleanup();
   (rename $dest_tmp, $dest) or cleanup();
}
exit (0);

sub cleanup {
   unlink $dest_tmp;
   exit (1);
}

sub cleanup_dir {
   unlink $dest_tmp_dir;
   exit (1);
}