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#!/bin/sh
# \
exec expect -- "$0" ${1+"$@"}
# passmass: change password on many machines
# Synopsis: passmass host1 host2 host3 ....
# Don Libes - March 11, 1991

# Description: Change passwords on the named machines.
#
# See passmass.man for further info.

exp_version -exit 5.0

if {$argc==0} {
    send_user "usage: $argv0 host1 host2 host3 . . .\n"
    exit
}

expect_before -i $user_spawn_id \003 exit

proc badhost {host emsg} {
    global badhosts

    send_user "\r\n\007password not changed on $host - $emsg\n\n"
    if {0==[llength $badhosts]} {
	set badhosts $host
    } else {
	set badhosts [concat $badhosts $host]
    }
}

# set defaults
set login "rlogin"
set program "passwd"
set user [exec whoami]
set su 0

set timeout -1
stty -echo

if {!$su} {
    send_user "old password: "
    expect_user -re "(.*)\n"
    send_user "\n"
    set password(old) $expect_out(1,string)
    set password(login) $expect_out(1,string)
    send_user "new password: "
    expect_user -re "(.*)\n"
    send_user "\n"
    set password(new) $expect_out(1,string)
    send_user "retype new password: "
    expect_user -re "(.*)\n"
    set password(newcheck) $expect_out(1,string)
    send_user "\n"
} else {
    send_user "login password: "
    expect_user -re "(.*)\n"
    send_user "\n"
    set password(login) $expect_out(1,string)
    send_user "root password: "
    expect_user -re "(.*)\n"
    send_user "\n"
    set password(old) $expect_out(1,string)
    send_user "new password: "
    expect_user -re "(.*)\n"
    send_user "\n"
    set password(new) $expect_out(1,string)
    send_user "retype new password: "
    expect_user -re "(.*)\n"
    set password(newcheck) $expect_out(1,string)
    send_user "\n"
}

stty echo
trap exit SIGINT

if ![string match $password(new) $password(newcheck)] {
    send_user "mismatch - password unchanged\n"
    exit
}

set timeout -1

set badhosts {}
for {set i 0} {$i<$argc} {incr i} {
    set arg [lindex $argv $i]
    switch -- $arg "-user" {
	incr i
	set user [lindex $argv $i]
	continue
    } "-prompt" {
	incr i
	set prompt [lindex $argv $i]
	continue
    } "-rlogin" {
	set login "rlogin"
	continue
    } "-slogin" {
	set login "slogin"
	continue
    } "-ssh" {
	set login "ssh"
	continue
    } "-telnet" {
	set login "telnet"
	continue
    } "-program" {
	incr i
	set program [lindex $argv $i]
	continue
    } "-timeout" {
	incr i
	set timeout [lindex $argv $i]
	continue
    } "-su" {
	incr i
	set su [lindex $argv $i]
	continue
    }

    set host $arg
    if {[string match $login "rlogin"]} {
	set pid [spawn rlogin $host -l $user]
    } elseif {[string match $login "slogin"]} {
	set pid [spawn slogin $host -l $user]
    } elseif {[string match $login "ssh"]} {
	set pid [spawn ssh $host -l $user]
    } else {
	set pid [spawn telnet $host]
	expect -nocase -re "(login|username):.*" {
	    send "$user\r"
	}
    }

    if ![info exists prompt] {
	if {[string match $user "root"]} {
	    set prompt "# "
	} else {
	    set prompt "(%|\\\$|#) "
	}
    }

    set logged_in 0
    while {1} {
	expect -nocase "password*" {
	    send "$password(login)\r"
	} eof {
	    badhost $host "spawn failed"
	    break
	} timeout {
	    badhost $host "could not log in (or unrecognized prompt)"
	    exec kill $pid
	    expect eof
	    break
	} -re "incorrect|invalid" {
	    badhost $host "bad password or login"
	    exec kill $pid
	    expect eof
	    break
	} -re $prompt {
	    set logged_in 1
	    break
	}
    }

    if (!$logged_in) {
	wait
	continue
    }

    if ($su) {
	send "/bin/su -\r"
	expect -nocase "password:"
	send "$password(old)\r"
	expect "# "
	send "$program root\r"
    } else {
	send "$program\r"
    }

    expect -nocase -re "(old|existing login) password:.*" {
	send "$password(old)\r"
	expect -nocase "sorry*" {
	    badhost $host "old password is bad?"
	    continue
	} -nocase "password:"
    } -nocase -re "new password:" {
	# got prompt, fall through
    } timeout {
	badhost $host "could not recognize prompt for password"
	continue
    }
    send "$password(new)\r"
    expect -re "not changed|unchanged" {
	badhost $host "new password is bad?"
	continue
    } -nocase -re "(password|verification|verify|again):.*"
    send "$password(new)\r"
    expect -nocase -re "(not changed|incorrect|choose new).*" {
	badhost $host "password is bad?"
	continue
    } -re "$prompt"
    send_user "\n"

    close
    wait
}

if {[llength $badhosts]} {
    send_user "\nfailed to set password on $badhosts\n"
}