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#!../expect --
# allow another user to share a shell (or other program) with you
# See kibitz(1) man page for complete info.
# Author: Don Libes, NIST
# Date written: December 5, 1991
# Date last editted: October 19, 1994
# Version: 2.11
exp_version -exit 5.0

# if environment variable "EXPECT_PROMPT" exists, it is taken as a regular
# expression which matches the end of your login prompt (but does not other-
# wise occur while logging in).

set prompt "(%|#|\\$) $"        ;# default prompt
set noproc 0
set tty ""                      ;# default if no -tty flag
set allow_escape 1              ;# allow escapes if true
set escape_char \035            ;# control-right-bracket
set escape_printable "^\]"
set verbose 1                   ;# if true, describe what kibitz is doing

set kibitz "kibitz"             ;# where kibitz lives if some unusual place.
                                ;# this must end in "kibitz", but can have
                                ;# things in front (like directory names).
#set proxy "kibitz"             ;# uncomment and set if you want kibitz to use
                                ;# some other account on remote systems

# The following code attempts to intuit whether cat buffers by default.
# The -u flag is required on HPUX (8 and 9) and IBM AIX (3.2) systems.
if [file exists $exp_exec_library/cat-buffers] {
        set catflags "-u"
} else {
        set catflags ""
}
# If this fails, you can also force it by commenting in one of the following.
# Or, you can use the -catu flag to the script.
#set catflags ""
#set catflags "-u"

# Some flags must be passed onto the remote kibitz process.  They are stored
# in "kibitz_flags".  Currently, they include -tty and -silent.
set kibitz_flags ""

while {[llength $argv]>0} {
        set flag [lindex $argv 0]
        switch -- $flag \
        "-noproc" {
                set noproc 1
                set argv [lrange $argv 1 end]
        } "-catu" {
                set catflags "-u"
                set argv [lrange $argv 1 end]
        } "-tty" {
                set tty [lindex $argv 1]
                set argv [lrange $argv 2 end]
                set kibitz_flags "$kibitz_flags -tty $tty"
        } "-noescape" {
                set allow_escape 0
                set argv [lrange $argv 1 end]
        } "-escape" {
                set escape_char [lindex $argv 1]
                set escape_printable $escape_char
                set argv [lrange $argv 2 end]
        } "-silent" {
                set verbose 0
                set argv [lrange $argv 1 end]
                set kibitz_flags "$kibitz_flags -silent"
        } "-proxy" {
                set proxy [lindex $argv 1]
                set argv [lrange $argv 2 end]
        } default {
                break
        }
}

if {([llength $argv]<1) && ($noproc==0)} {
        send_user "usage: kibitz \[args] user \[program ...]\n"
        send_user "   or: kibitz \[args] user@host \[program ...]\n"
        exit
}

log_user 0
set timeout -1

set user [lindex $argv 0]
if [string match -r $user] {
        send_user "KRUN"        ;# this tells user_number 1 that we're running
                                ;# and to prepare for possible error messages
        set user_number 3
        # need to check that it exists first!
        set user [lindex $argv 1]
} else {
        set user_number [expr 1+(0==[string first - $user])]
}

# at this point, user_number and user are correctly determined
# User who originated kibitz session has user_number == 1 on local machine.
# User who is responding to kibitz has user_number == 2.
# User who originated kibitz session has user_number == 3 on remote machine.

# user 1 invokes kibitz as "kibitz user[@host]"
# user 2 invokes kibitz as "kibitz -####" (some pid).
# user 3 invokes kibitz as "kibitz -r user".

# uncomment for debugging: leaves each user's session in a file: 1, 2 or 3
#exec rm -f $user_number
#exp_internal -f $user_number 0

set user2_islocal 1     ;# assume local at first

# later move inside following if $user_number == 1
# return true if x is a prefix of xjunk, given that prefixes are only
# valid at . delimiters
# if !do_if0, skip the whole thing - this is here just to make caller simpler
proc is_prefix {do_if0 x xjunk} {
        if 0!=$do_if0 {return 0}
        set split [split $xjunk .]
        for {set i [expr [llength $split]-1]} {$i>=0} {incr i -1} {
                if [string match $x [join [lrange $split 0 $i] .]] {return 1}
        }
        return 0
}

# get domainname.  Unfortunately, on some systems, domainname(1)
# returns NIS domainname which is not the internet domainname.
proc domainname {} {
        # open pops stack upon failure
        set rc [catch {open /etc/resolv.conf r} file]
        if {$rc==0} {
                while {-1!=[gets $file buf]} {
                        if 1==[scan $buf "domain %s" name] {
                                close $file
                                return $name
                        }
                }
                close $file
        }

        # fall back to using domainname
        if {0==[catch {exec domainname} name]} {return $name}

        error "could not figure out domainname"
}

if $user_number==1 {
        if $noproc==0 {
                if [llength $argv]>1 {
                        set pid [eval spawn [lrange $argv 1 end]]
                } else {
                        # if running as CGI, shell may not be set!
                        set shell /bin/sh
                        catch {set shell $env(SHELL)}
                        set pid [spawn $shell]
                }
                set shell $spawn_id
        }

        # is user2 remote?
        regexp (\[^@\]*)@*(.*) $user ignore tmp host
        set user $tmp
        if ![string match $host ""] {
                set h_rc [catch {exec hostname} hostname]
                set d_rc [catch domainname      domainname]

                if {![is_prefix $h_rc $host $hostname]
                 && ![is_prefix $d_rc $host $hostname.$domainname]} {
                        set user2_islocal 0
                }
        }

        if !$user2_islocal {
                if $verbose {send_user "connecting to $host\n"}

                if ![info exists proxy] {
                        proc whoami {} {
                                global env
                                if [info exists env(USER)] {return $env(USER)}
                                if [info exists env(LOGNAME)] {return $env(LOGNAME)}
                                if ![catch {exec whoami} user] {return $user}
                                if ![catch {exec logname} user] {return $user}
                                # error "can't figure out who you are!"
                        }
                        set proxy [whoami]
                }
                spawn rlogin $host -l $proxy -8
                set userin $spawn_id
                set userout $spawn_id

                catch {set prompt $env(EXPECT_PROMPT)}

                set timeout 120
                expect {
                        assword: {
                                stty -echo
                                send_user "password (for $proxy) on $host: "
                                set old_timeout $timeout; set timeout -1
                                expect_user -re "(.*)\n"
                                send_user "\n"
                                set timeout $old_timeout
                                send "$expect_out(1,string)\r"
                                # bother resetting echo?
                                exp_continue
                        } incorrect* {
                                send_user "invalid password or account\n"
                                exit
                        } "TERM = *) " {
                                send "\r"
                                exp_continue
                        } timeout {
                                send_user "connection to $host timed out\n"
                                exit
                        } eof {
                                send_user "connection to host failed: $expect_out(buffer)"
                                exit
                        } -re $prompt
                }
                if $verbose {send_user "starting kibitz on $host\n"}
                # the kill protects user1 from receiving user3's
                # prompt if user2 exits via expect's exit.
                send "$kibitz $kibitz_flags -r $user;kill -9 $$\r"

                expect {
                        -re "kibitz $kibitz_flags -r $user.*KRUN" {}
                        -re "kibitz $kibitz_flags -r $user.*(kibitz\[^\r\]*)\r" {
                                send_user "unable to start kibitz on $host: \"$expect_out(1,string)\"\n"
                                send_user "try rlogin by hand followed by \"kibitz $user\"\n"
                                exit
                        }
                        timeout {
                                send_user "unable to start kibitz on $host: "
                                set expect_out(buffer) "timed out"
                                set timeout 0; expect -re .+
                                send_user $expect_out(buffer)
                                exit
                        }
                }
                expect {
                        -re ".*\n" {
                                # pass back diagnostics
                                # should really strip out extra cr
                                send_user $expect_out(buffer)
                                exp_continue
                        }
                        KABORT exit
                        default exit
                        KDATA
                }
        }
}

if $user_number==2 {
        set pid [string trimleft $user -]
}

set local_io [expr ($user_number==3)||$user2_islocal]
if $local_io||($user_number==2) {
        if 0==[info exists pid] {set pid [pid]}

        set userinfile /tmp/exp0.$pid
        set useroutfile /tmp/exp1.$pid
}

proc prompt1 {} {
        return "kibitz[info level].[history nextid]> "
}

set esc_match {}
if {$allow_escape} {
   set esc_match {
      $escape_char {
        send_user "\nto exit kibitz, enter: exit\n"
        send_user "to suspend kibitz, press appropriate job control sequence\n"
        send_user "to return to kibitzing, enter: return\n"
        interpreter
        send_user "returning to kibitz\n"
      }
   }
}

proc prompt1 {} {
        return "kibitz[info level].[history nextid]> "
}

set timeout -1

# kibitzer executes following code
if $user_number==2 {
        # for readability, swap variables
        set tmp $userinfile
        set userinfile $useroutfile
        set useroutfile $tmp

        if ![file readable $userinfile] {
                send_user "Eh?  No one is asking you to kibitz.\n"
                exit -1
        }
        spawn -open [open "|cat $catflags < $userinfile" "r"]
        set userin $spawn_id

        spawn -open [open $useroutfile w]
        set userout $spawn_id
        # open will hang until other user's cat starts

        stty -echo raw
        if $allow_escape {send_user "Escape sequence is $escape_printable\r\n"}

        # While user is reading message, try to delete other fifo
        catch {exec rm -f $userinfile}

        eval interact $esc_match \
                -output $userout \
                -input $userin

        exit
}

# only user_numbers 1 and 3 execute remaining code

proc abort {} {
        global user_number

        # KABORT tells user_number 1 that user_number 3 has run into problems
        # and is exiting, and diagnostics have been returned already
        if $user_number==3 {send_user KABORT}
        exit
}

if $local_io {
    proc mkfifo {f} {
        if 0==[catch {exec mkfifo $f}] return           ;# POSIX
        if 0==[catch {exec mknod $f p}] return
        # some systems put mknod in wierd places
        if 0==[catch {exec /usr/etc/mknod $f p}] return ;# Sun
        if 0==[catch {exec /etc/mknod $f p}] return     ;# AIX, Cray
        puts "Couldn't figure out how to make a fifo - where is mknod?"
        abort
    }

    proc rmfifos {} {
        global userinfile useroutfile
        catch {exec rm -f $userinfile $useroutfile}
    }

    trap {rmfifos; exit} {SIGINT SIGQUIT SIGTERM}

    # create 2 fifos to communicate with other user
    mkfifo $userinfile
    mkfifo $useroutfile
    # make sure other user can access despite umask
    exec chmod 666 $userinfile $useroutfile

    if $verbose {send_user "asking $user to type:  kibitz -$pid\n"}

    # can't use exec since write insists on being run from a tty!
    set rc [catch {
                   system echo "Can we talk?  Run: \"kibitz -$pid\"" | \
                        /bin/write $user $tty
                }
        ]
    if $rc {rmfifos;abort}

    spawn -open [open $useroutfile w]
    set userout $spawn_id
    # open will hang until other user's cat starts

    spawn -open [open "|cat $catflags < $userinfile" "r"]
    set userin $spawn_id
    catch {exec rm $userinfile}
}

stty -echo raw

if $user_number==3 {
        send_user "KDATA"       ;# this tells user_number 1 to send data

        interact {
                -output $userout
                -input $userin eof {
                        wait -i $userin
                        return -tcl
                } -output $user_spawn_id 
        }
} else {
        if $allow_escape {send_user "Escape sequence is $escape_printable\r\n"}

        if $noproc {
                interact {
                        -output $userout
                        -input $userin eof {wait -i $userin; return}
                        -output $user_spawn_id
                }
        } else {
                eval interact $esc_match {
                        -output $shell \
                        -input $userin eof {
                                wait -i $userin
                                close -i $shell
                                return
                        } -output $shell \
                        -input $shell -output "$user_spawn_id $userout"
                }
                wait -i $shell
        }
}

if $local_io rmfifos