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#!/bin/sh
# \
exec expect "$0" ${1+"$@"}
#
# Name: getpassck
#
# Description:
# This script demonstrates when programs using getpass sometimes
# fail. The reason is that some implementations of getpass prompt
# before the pty/tty has completed the switch to no-echo. This may
# not be obvious from examination of the implementation of getpass
# itself because the driver itself may cut corners and be
# responsible for allowing the call to return prematurely.
#
# Directions:
# Simply run this script. It will loop 100 times attempting to
# generate the getpass problem. If the bug cannot be reproduced,
# you will see 100 failed attempts to su. If the bug can be
# reproduced, the script exits as soon as it is detected.
#
# Author: Don Libes <don@libes.com>
# Version: 1.0, Wed Mar 9 12:36:12 EST 2005
#
for {set i 0} {$i < 100} {incr i} {
spawn -noecho su
expect ": " ;# get password prompt as quickly as possible
send "X\r" ;# send password
expect X {
puts "Password was echoed! This system has the getpass problem."
exit
} "orry" {
close
wait
}
}
puts "Failed to reproduce getpass problem."
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