check clnt_stat before unmarshalling arguments. 

when the proxy receives an EOF from a client, it should close all
the fds open with those modules.  KILL signal would be even more
effective at cleaning up modules but might wipe out data that module
is still writing to a socket.  therefore, it should be the modules
responsibility to clean itself up when it gets an EOF.

need to write a preexit function in REX client that checks for pending
port forwarding connections, etc.  and has an option for "background"
operation like ssh

We hava a verbose mode--the most important types of messages that
should be reported are the events that rex is waiting for.  for
example, "waiting for agent (sfscd) file descriptor"

ideally ptyd should calculate the host from which a rex connection
comes and that's what should be logged into the utmp, etc.

fix readcb IO errors when you close a channel/connection

add verbosity option so we don't see log messages all of the time.
also, can we get the messages that sfssd spits out on error; they're
often more useful

the agent should clean up it's state if sfssd is killed and restarted
by the system administrator

fix the problem of rex not exited b/c it doesn't receive all of the
appropriate exit signals

sometimes when a command isn't found rex will refuse to shutdown and
reset the terminal, requiring a kill from another window:
   rex -x /shome/shakespeare sdfljaslkd  (for example)
(same problem as above I think)

put escape seq. stuff in for exec channel also & add command-line option

use SRP to get hostname if no self-certifying pathname is available

audit trail

view of /sfs directory should be there same on all machines rex'ed to?