258 lines
4.5 KiB
Plaintext
258 lines
4.5 KiB
Plaintext
.TH LISTEN 8
|
|
.SH NAME
|
|
listen, listen1, tcp7, tcp9, tcp19, tcp21, tcp22, tcp23, tcp25, tcp53, tcp110, tcp113, tcp143, tcp445, tcp513, tcp515, tcp564, tcp565, tcp566, tcp567, tcp993, tcp995, tcp1723, tcp17007, tcp17008, tcp17009, tcp17010, tcp17013 \- listen for calls on a network device
|
|
.SH SYNOPSIS
|
|
.B aux/listen
|
|
.RB [ -iq ]
|
|
.RB [ -d
|
|
.IR srvdir ]
|
|
.RB [ -t
|
|
.IR trustsrvdir ]
|
|
.RB [ -n
|
|
.IR namespace ]
|
|
.RB [ -p
|
|
.IR maxprocs ]
|
|
.RI [ net ]
|
|
.PP
|
|
.B aux/listen1
|
|
[
|
|
.B -tv
|
|
]
|
|
.RB [ -p
|
|
.IR maxprocs ]
|
|
.I addr
|
|
.I cmd
|
|
[
|
|
.I args...
|
|
]
|
|
.SH DESCRIPTION
|
|
.I listen
|
|
listens on a network for inbound calls to local services.
|
|
.I Net
|
|
is the network protocol on which to listen, by default
|
|
.BR /net/tcp .
|
|
The services available are executable, non-empty files in
|
|
.I srvdir
|
|
or
|
|
.IR trustsrvdir .
|
|
If neither
|
|
.I srvdir
|
|
nor
|
|
.I trustsrvdir
|
|
is given,
|
|
.I listen
|
|
looks for executable files in
|
|
.BR /bin/service .
|
|
Services found in
|
|
.I srvdir
|
|
are executed as user
|
|
.BR none ;
|
|
services found in
|
|
.I trustsrvdir
|
|
are executed as the user who started
|
|
.IR listen .
|
|
When changing user to
|
|
.BR none ,
|
|
a new namespace is created,
|
|
usually by executing
|
|
.BR /lib/namespace ,
|
|
but
|
|
.B -n
|
|
selects an alternate
|
|
.IR namespace .
|
|
The
|
|
.B -p
|
|
option limits the number of processes that
|
|
.I listen
|
|
spawns to service the connections. If the
|
|
.I maxprocs
|
|
limit is reached,
|
|
.I listen
|
|
will log the event and delay servicing until the number
|
|
of connection processes drops below the limit again. A
|
|
.I maxprocs
|
|
smaller or equal zero means no limit (default).
|
|
Option
|
|
.B -q
|
|
suppresses affirmative log information.
|
|
Option
|
|
.B -i
|
|
suppresses the periodic scan of the service directories for changes.
|
|
.PP
|
|
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
|
|
.BR tcp565 .
|
|
.PP
|
|
At least the following services are available in
|
|
.BR /bin/service .
|
|
.TF \ tcp0000
|
|
.TP
|
|
.B tcp564
|
|
serve a piece of the name space using the Plan 9 file system protocol,
|
|
with authentication via
|
|
.I Tauth
|
|
(in
|
|
.IR attach (5)),
|
|
no encryption,
|
|
and multiplex multiple users on a single connection
|
|
(used by
|
|
.IR srv (4),
|
|
and also by Unix systems to see Plan 9 files).
|
|
.TP
|
|
.B tcp17007
|
|
serve a piece of the name space using the Plan 9 file system protocol,
|
|
with authentication at the start,
|
|
optional SSL encryption,
|
|
and no multiplexing of users
|
|
(typically used by
|
|
.IR cpu (1)
|
|
and
|
|
.IR import (4)).
|
|
Not usable by user
|
|
.IR none .
|
|
.TP
|
|
.B tcp17008
|
|
like
|
|
.BR tcp17007 ,
|
|
but serves the root of the tree,
|
|
forgoing the negotiation for which subtree to serve.
|
|
.TP
|
|
.B tcp17009
|
|
.I rx
|
|
remote execution.
|
|
.TP
|
|
.B tcp17010
|
|
server for
|
|
.IR cpu (1)
|
|
command.
|
|
.TP
|
|
.B tcp17013
|
|
server for old
|
|
.IR cpu (1)
|
|
command for compatibility with old clients.
|
|
.TP
|
|
.B tcp7
|
|
echo any bytes received (bit mirror)
|
|
.TP
|
|
.B tcp9
|
|
consume any bytes received (bit bucket)
|
|
.TP
|
|
.B tcp19
|
|
.B chargen
|
|
service.
|
|
.TP
|
|
.B tcp21
|
|
FTP daemon
|
|
.TP
|
|
.B tcp22
|
|
.IR ssh (1)
|
|
`secure shell' encrypted terminal connection or file transfer.
|
|
.TP
|
|
.B tcp23
|
|
.B telnet
|
|
terminal connection.
|
|
.TP
|
|
.B tcp25
|
|
mail delivery.
|
|
.TP
|
|
.B tcp53
|
|
TCP port for DNS.
|
|
.TP
|
|
.B tcp110
|
|
POP3 port.
|
|
.TP
|
|
.B tcp113
|
|
.B Ident
|
|
port (always reports
|
|
.BR none ).
|
|
.TP
|
|
.B tcp143
|
|
IMAP4rev1 port.
|
|
.TP
|
|
.B tcp445
|
|
CIFS/SMB file sharing.
|
|
.TP
|
|
.B tcp513
|
|
.B rlogin
|
|
terminal connection.
|
|
.TP
|
|
.B tcp515
|
|
LP daemon; see
|
|
.IR lp (8).
|
|
.TP
|
|
.B tcp565
|
|
report the address of the incoming call.
|
|
.TP
|
|
.B tcp993
|
|
Secure IMAP4rev1 port.
|
|
.TP
|
|
.B tcp995
|
|
Secure POP3 port.
|
|
.TP
|
|
.B tcp1723
|
|
PPTP (point-to-point tunnelling protocol) service.
|
|
.PD
|
|
.PP
|
|
At least the following services are available in
|
|
.BR /bin/service.auth ,
|
|
the usual
|
|
.IR trustsrvdir .
|
|
.TF \ tcp0000
|
|
.TP
|
|
.B tcp566
|
|
validate a SecureNet box.
|
|
.TP
|
|
.B tcp567
|
|
Plan 9 authentication-ticket service.
|
|
.PD
|
|
.PP
|
|
.I Listen1
|
|
is a lightweight listener intended for personal use,
|
|
modeled from Inferno's
|
|
.\" write out this way so automatic programs
|
|
.\" don't try to make it into a real man page reference.
|
|
\fIlisten\fR(1).
|
|
announces on
|
|
.IR address ,
|
|
running
|
|
.I cmd
|
|
.I args...
|
|
for each incoming connection;
|
|
the network directory is passed in the environment
|
|
as
|
|
.BR $net .
|
|
Option
|
|
.B -t
|
|
causes
|
|
.I listen1
|
|
to run as the invoking user; the default
|
|
is to become
|
|
.B none
|
|
before listening.
|
|
Option
|
|
.B -v
|
|
causes verbose logging on standard output.
|
|
See
|
|
.B /rc/bin/tlssrvtunnel
|
|
for an example.
|
|
.SH FILES
|
|
.TF /env/sysname
|
|
.TP
|
|
.B /net/tcp
|
|
by convention, TCP device bind point
|
|
.SH SOURCE
|
|
.B /sys/src/cmd/aux/listen*.c
|
|
.br
|
|
.B /rc/bin/service*
|
|
.SH "SEE ALSO"
|
|
.IR authsrv (6),
|
|
.IR dial (2)
|
|
.SH BUGS
|
|
.IR Srvdir ,
|
|
.IR trustsrvdir
|
|
and
|
|
.I namespace
|
|
must all be absolute path names.
|