LISTEN(8)						      System Manager's Manual							 LISTEN(8)

NAME

       listen,	dkcpu, dkcpunote, dkdiscard, dkecho, dkexportfs, dkrexexec, dkticket, dkwhoami, dksmtp, dkdcon, dklogin, dkguard, il7, il9, il565,
       il566, il17005, il17006, il17007, il17009, tcp2, tcp7, tcp9, tcp21, tcp23, tcp80, tcp25, tcp513, tcp515, tcp564, tcp565, tcp566,  tcp17007,
       tcp6000 - listen for calls on a network device

SYNOPSIS

       aux/listen [-q] [-d srvdir] [-t trustsrvdir] [name]]

DESCRIPTION

       listen  announces  itself  to  a network as name (by default the contents of /env/sysname) and listens for inbound calls to local services.
       Net is the network device on which to listen, by default /net/dk.  The services available are executable files in  srvdir  or  trustsrvdir.
       If  neither  srvdir  nor trustsrvdir is given, listen looks for executable files in /bin/service.  Services found in srvdir are executed as
       user none; services found in trustsrvdir as executed as the user who started listen.  Option -q suppresses affirmative log information.

       Service names are made by concatenating the name of the network with the name of the service or port.  For example, an inbound call on  the
       TCP network for port 565 executes service tcp565, while a call on the Datakit network for service whoami executes service dkwhoami.

       The following services are available in /bin/service.

       dkcpu il17005
	      server for cpu(1) command.

       dkcpunote il17006
	      /proc/pid/notify forwarding for cpu(1).

       dkexportfs il17007 tcp17007
	      serve a piece of the name space using the Plan 9 file system protocol, with authentication (typically used by cpu(1)).

       tcp564 like 17007, without authentication (used by Unix systems to see Plan 9 files).

       dkrexexec il17009
	      remote execution.

       dkwhoami il565 tcp565
	      report the address of the incoming call.

       tcp21  FTP daemon

       tcp80  HTTP daemon; see httpd(8).

       tcp515 LP daemon; see lp(8).

       tcp6000
	      X-window callback

       dksmtp tcp25
	      mail delivery.

       dkdcon research Unix terminal connection.

       dklogin
	      generic terminal connection.

       tcp23  telnet terminal connection.

       tcp513 rlogin terminal connection.

       tcp2   hold the connection open; sleep for a long time

       dkecho il7 tcp7
	      echo any bytes received (bit mirror)

       dkdiscard il9 tcp9
	      consume any bytes received (bit bucket)

       The following services are available in /bin/service.auth.

       dkguard tcp566
	      check a SecureNet box.

       dkticket il566
	      authentication requests.

FILES

       /net/dk
	      by convention, Datakit device bind point

       /net/il
	      by convention, IL device bind point

       /net/tcp
	      by convention, TCP device bind point

       /env/sysname
	      default announced name

SOURCE

       The source to listen is in /sys/src/cmd/aux/listen.c.  The other commands are rc(1) scripts in /rc/bin/service.

SEE ALSO

       dkconfig(8), auth(6), dk(3), dial(2)

																	 LISTEN(8)