is not exploitable because telnet doesn't run with elevated privs.
Didn't fix all the other potential buffer overflows. Would be a good
task for someone who has lots of time to carefully study each case
because cut and paste solutions are dangerous for this code base.
Added $FreeBSD$ in the same way that command.c did it.
Add some buffer overrun fixes from OpenBSD and myself.
Add skey calculator kludge from OpenBSD.
TODO: do a real merge of dab's sources... probably just make telnet and
telnetd contrib software.
Obtained from: OpenBSD, dab@bsdi.com