1#!/usr/bin/perl
2# Emacs settings: -*- tab-width: 4 -*-
3#
4# File: installtool
5# 
6# Abstract: Copy "ddnswriteconfig" to Application Support and make it setuid root.
7# 
8# Copyright: (c) Copyright 2005 Apple Computer, Inc. All rights reserved.
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44#
45# Create the Bonjour subdirectory.
46# Copy ARGV[0] to $dest and set owner and suid permissions.
47#
48# This script will be run as root by the AEWP trampoline.
49#
50
51use File::Temp qw/ :mktemp /;
52
53$dest_dir = "/Library/Application Support/Bonjour";
54$dest = $dest_dir . "/ddnswriteconfig";
55
56$template = ".XXXXXX";
57
58# Perl seems to think this code is running setuid root, so it applies its security checks.
59# See <http://www.monster-submit.com/resources/docs/pod/perlsec.html>.
60# In fact this is NOT a setuid script. It is a normal unprivileged user-level script --
61# but it is run as root when properly authorized by a user with an admin password,
62# via the AuthorizationExecuteWithPrivileges() call.
63# We therefore have to do this trick pattern match to 'untaint' the source file specified in $ARGV[0].
64if ($ARGV[0] =~ /^(.+)$/) { $src = $1; }
65
66# Also clear $ENV{PATH} so we don't get "Insecure $ENV{PATH}" fatal errors
67$ENV{PATH} = "";
68
69if (! -d $dest_dir) {
70   $dest_tmp_dir = mkdtemp ($dest_dir . $template);
71   (chown 0, 80, $dest_tmp_dir) or cleanup_dir();
72   (chmod 0755, $dest_tmp_dir) or cleanup_dir();
73   (rename $dest_tmp_dir, $dest_dir) or cleanup_dir();
74}
75
76$dest_tmp = mktemp ($dest . $template);
77
78if ($src ne '') {
79   system ('/bin/cp', '-f', $src, $dest_tmp) and cleanup();
80   (chown 0, 80, $dest_tmp) or cleanup();
81   (chmod 04555, $dest_tmp) or cleanup();
82   (rename $dest_tmp, $dest) or cleanup();
83}
84exit (0);
85
86sub cleanup {
87   unlink $dest_tmp;
88   exit (1);
89}
90
91sub cleanup_dir {
92   unlink $dest_tmp_dir;
93   exit (1);
94}
95