listen man page on Plan9

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LISTEN(8)							     LISTEN(8)

NAME
       listen,	listen1, tcp7, tcp9, tcp19, tcp21, tcp22, tcp23, tcp25, tcp53,
       tcp110, tcp113, tcp143, tcp513, tcp515, tcp564, tcp565, tcp566, tcp567,
       tcp993,	 tcp995,  tcp1723,  tcp17007,  tcp17008,  tcp17009,  tcp17010,
       tcp17013 - listen for calls on a network device

SYNOPSIS
       aux/listen [-iq] [-d srvdir] [-t trustsrvdir] [-n namespace] [net]

       aux/listen1 [ -tv ] addr cmd [ args...  ]

DESCRIPTION
       listen listens on a network for inbound calls to local  services.   Net
       is  the	network protocol on which to listen, by default /net/tcp.  The
       services available are executable, non-empty files in srvdir or	trust‐
       srvdir.	 If  neither srvdir nor trustsrvdir is given, listen looks for
       executable files in /bin/service.  Services found in  srvdir  are  exe‐
       cuted  as  user none; services found in trustsrvdir are executed as the
       user who started listen.	 When changing user to none, a	new  namespace
       is  created,  usually  by  executing  /lib/namespace, but -n selects an
       alternate namespace.  Option -q suppresses affirmative log information.
       Option  -i  suppresses the periodic scan of the service directories for
       changes.

       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.  These	 programs  are
       execed  with arguments consisting of service (e.g., protocol (e.g., and
       the directory of this network connection, with the network connection's
       data  file bound to /dev/cons and opened read/write as file descriptors
       0, 1 and 2.

       At least the following services are available in /bin/service.

       tcp564 serve a piece of the name space using the	 Plan  9  file	system
	      protocol,	 with  authentication  via  Tauth  (in	attach(5)), no
	      encryption, and multiplex multiple users on a single  connection
	      (used by srv(4), and also by Unix systems to see Plan 9 files).

       tcp17007
	      serve  a	piece  of  the name space using the Plan 9 file system
	      protocol, with authentication at the start, optional SSL encryp‐
	      tion, and no multiplexing of users (typically used by cpu(1) and
	      import(4)).  Not usable by user none.

       tcp17008
	      like tcp17007, but serves the root of  the  tree,	 forgoing  the
	      negotiation for which subtree to serve.

       tcp17009
	      rx remote execution.

       tcp17010
	      server for cpu(1) command.

       tcp17013
	      server  for  old	cpu(1)	command	 for  compatibility  with  old
	      clients.

       tcp7   echo any bytes received (bit mirror)

       tcp9   consume any bytes received (bit bucket)

       tcp19  chargen service.

       tcp21  FTP daemon

       tcp22  ssh(1) `secure shell'  encrypted	terminal  connection  or  file
	      transfer.

       tcp23  telnet terminal connection.

       tcp25  mail delivery.

       tcp53  TCP port for DNS.

       tcp110 POP3 port.

       tcp113 Ident port (always reports none).

       tcp143 IMAP4rev1 port.

       tcp513 rlogin terminal connection.

       tcp515 LP daemon; see lp(8).

       tcp565 report the address of the incoming call.

       tcp993 Secure IMAP4rev1 port.

       tcp995 Secure POP3 port.

       tcp1723
	      PPTP (point-to-point tunnelling protocol) service.

       At least the following services are available in /bin/service.auth, the
       usual trustsrvdir.

       tcp566 validate a SecureNet box.

       tcp567 Plan 9 authentication-ticket service.

       Listen1 is a lightweight listener intended for  personal	 use,  modeled
       from  Inferno's	listen(1).   Listen1 announces on address, running cmd
       args...	for each incoming connection; the network directory is	passed
       in  the	environment  as	 $net.	Option -t causes listen1 to run as the
       invoking user; the default is to become none before listening.	Option
       -v causes verbose logging on standard output.  See /rc/bin/tlssrvtunnel
       for an example.

FILES
       /net/tcp
	      by convention, TCP device bind point

SOURCE
       /sys/src/cmd/aux/listen*.c
       /rc/bin/service*

SEE ALSO
       authsrv(6), dial(2)

BUGS
       Srvdir, trustsrvdir and namespace must all be absolute path names.

								     LISTEN(8)
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