Zines/phrack/30/6.txt

                                ==Phrack Inc.==

                     Volume Three, Issue 30, File #6 of 12

                   Decnet Hackola : Remote Turist TTY (RTT)
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

                           A Late-Night Creation Of

                                   *Hobbit*

This VMS network frob is yet another "tell"-type thing.  This one has an
uncommon feature though:  recursion (i.e. you can be connected to some host
and open *another* connection to a third host and it will [attempt to!] "do the
right thing").  Also, you can ^Y out and if you run it again, it will return to
the open connection instead of starting a new one.

_H*


*************************************************************************
$! RTT -- Remote Turist TTY interface.  Do @RTT hostname or @RTT area.node
$! to start; this file must exist in the remote machine's default area.
$! You can ^Y out and the network channel will stick around; invoking RTT
$! again will resume the extant process and ignore arguments.
$! If we are a network object, play server, if not, we must be the client.
$! If we are called while already playing server, recurse to the end host.
$! This recursion in theory can happen infinite times.  Make damn sure
$! what you call this file and the "task=" spec jive, and that they are the
$! same file, or you will fall victim to very vicious timing screws.
$!
$! Another result of *Hobbit* abusing network file jobs until well past dawn.
$!
$! _H*
$set noon
$if f$mode().eqs."NETWORK".and.p1.eqs."" then $goto srv
$! Talking to a luser, go find the net job
$magic=0                        ! assume top level
$if f$trnlnm("nf",,,,,"table_name").nes."" then $goto lread
$sl=f$len(p1)
$dot=f$locate(".",p1)           ! area.node
$if sl.eq.dot then $goto nopen  ! no dot, treat normally
$q=f$loc("""",p1)               ! access control??
$node=f$ext(0,dot,p1)           ! area
$dot=dot+1                      ! point past it now
$node=node*1024+f$ext(dot,q-dot,p1)  ! and pull out the complete node
$rest=""""+f$ext(q,80,p1)+""""  ! superquotify the quotes [yeccchh!]
$p1="''node'''rest'"            ! add remains in stringwise [ack barf]
$! We were called with an argument; but if we're network mode, we're *already*
$! a server, so do special things.
$nopen: $if f$mode().eqs."NETWORK" then $magic=1
$! Top-level user process or recursed here: client connect
$open/read/write/err=yuk nf 'p1'::"0=rtt"
$read/time=5/err=yuk nf hprm    ! let other end tell us where we got
$prm==hprm                      ! global prompt str so we resume correctly
$write sys$output "Connection open"
$if magic then $goto m_setup
$lread: $read/prompt="''prm'$ "/end=lclose sys$command line
$write nf line                  ! send the sucker and go get the stuff
$ltype: $read/time=8/err=tmo/end=lclose nf line
$if line.eqs."%%eoc%%" then $goto lread
$if line.eqs."%%magic%%" then $goto newprm
$write sys$output line
$goto ltype
$newprm: $read nf hprm          ! new prompt gets piped in from servers
$prm==hprm                      ! let us find it
$read nf line                   ! garbola %%eoc%% -- avoid timing fuckup
$if line.nes."%%eoc%%" then $goto hpe  !! oops !!
$goto lread
$tmo: $write sys$output "[Timed out]"   ! supposed to bail out on a fuckup
$goto lread                             ! it doesn't always work, though.
$!
$! Do a special dance when we're recursing
$m_setup: $write nnn "%%magic%%"
$write nnn prm                  ! notify client end of new connection
$signal                         ! flush the inbetweens
$goto rread                     ! and drop to magic server
$!
$srv:                           ! Normal remote task half
$! This is an unbelievable kludge.  You can't just open sys$net: and then
$! have program output go there as well as the control thingies, but you
$! *can* pipe everything to your sys$net-opened-device: and it *works*!
$open/read/write/err=yuk nnn sys$net:
$close sys$output               ! netserver.log?
$close sys$error
$magic=0                        ! not recursing yet
$! Some handy symbols for the far end
$rtt:==@sys$login:rtt           ! make further connects easier
$ncp:==$ncp                     ! for hacking the network
$signal:==write nnn """%%eoc%%""" ! magic sync string
$write nnn f$trnl("sys$node","lnm$system_table")        ! HELO...
$def/pr sys$output nnn:         ! the awful kludge is invoked
$def/pr sys$error nnn:          ! for error handling too
$!
$! Server loop
$rread: $read/end=rclose nnn line
$if magic then $goto passing
$'line'
$m_cmd_end: $signal             ! signal for all completions
$goto rread
$! If we're magically in the middle, handle differently
$passing: $write nf line
$mtype: $read/time=5/err=mclose/end=mclose nf line
$if line.eqs."%%eoc%%" then $goto m_cmd_end
$write nnn line
$goto mtype
$!
$! Closure and error handlers
$! General protocol error catch
$yuk: $write sys$output "Couldn't open network!"
$exit
$! Here if the luser typed ^Z
$lclose: $close nf              ! should signal eof at far end
$exit
$! Here if we got hung up on by the client
$rclose: $if magic then $close nf
$close nnn
$stop/id=0
$! Here if we're magic and our remote server exited: tell client whats flying
$mclose: $close nf
$magic=0
$write nnn "%%magic%%"
$write nnn f$trnl("sys$node","lnm$system_table")
$signal
$goto rread
$! Here if we recursed down the line there and didn't see the right things
$hpe: $write sys$output "!!Hairy protocol error!!"
$close nf
$exit
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