TCPwrappers do a getpeername() after bieng passed the socket descriptor from
inetd. On some OSs this can cause a problem, atleast on SCO. It seems that
if you connect real fast, and disconnect (just connect() then exit()). It
winds up logging "unknown" as the hostname. This is because by the time
tcpwrappers get to make that call the OS has already gotten a FIN and closed
off the connection. I verfied this with a sniffer.
Unfortunately this is a design issue, TCPwrappers "cant" be fixed to do this
without modification to inetd. If the address from accept() was given to the
tcpwrapper via an environment variable this would fix the problem and
eliminate the race condition.
Mind you tcpserver/tcpcontrol by Dan Bernstein already does the environment
variable passing.
-- Thamer Al-Herbish shadows@whitefang.com