.\" @(#)rpcbind.1m 1.19 92/09/14 SMI; from SVr4
.\" Copyright 1989 AT&T
.\" Copyright 1991 Sun Microsystems, Inc.
.\" $FreeBSD: src/usr.sbin/rpcbind/rpcbind.8,v 1.5 2002/11/27 15:33:47 ru Exp $
n
.Dd September 14, 1992
.Dt RPCBIND 8
.Os
.Sh NAME
.Nm rpcbind
.Nd universal addresses to RPC program number mapper
.Sh SYNOPSIS
.Nm
.Op Fl adhiLlsr
.Sh DESCRIPTION
The
.Nm
utility is a server that converts
.Tn RPC
program numbers into
universal addresses.
It must be running on the host to be able to make
.Tn RPC
calls
on a server on that machine.
.Pp
When an
.Tn RPC
service is started,
it tells
.Nm
the address at which it is listening,
and the
.Tn RPC
program numbers it is prepared to serve.
When a client wishes to make an
.Tn RPC
call to a given program number,
it first contacts
.Nm
on the server machine to determine
the address where
.Tn RPC
requests should be sent.
.Pp
The
.Nm
utility should be started before any other RPC service.
Normally, standard
.Tn RPC
servers are started by port monitors, so
.Nm
must be started before port monitors are invoked.
.Pp
When
.Nm
is started, it checks that certain name-to-address
translation-calls function correctly.
If they fail, the network configuration databases may be corrupt.
Since
.Tn RPC
services cannot function correctly in this situation,
.Nm
reports the condition and terminates.
.Pp
The
.Nm
utility can only be started by the super-user.
.Sh OPTIONS
.Bl -tag -width indent
.It Fl a
When debugging
.Pq Fl d ,
do an abort on errors.
.It Fl d
Run in debug mode.
In this mode,
.Nm
will log additional information during operation, 
and will abort on certain errors if
.Fl a
is also specified.
With this option, the name-to-address translation consistency
checks are shown in detail.
.It Fl f
Do not fork and become a background process.
.It Fl h
Specify specific IP addresses to bind to for UDP requests.
This option may be specified multiple times and can be used to
restrict the interfaces rpcbind will respond to.
When specifying IP addresses with
.Fl h ,
.Nm
will automatically add
.Li 127.0.0.1
and if IPv6 is enabled,
.Li ::1
to the list.
If no
.Fl h
option is specified,
.Nm
will bind to
.Dv INADDR_ANY ,
which could lead to problems on a multi-homed host due to
.Nm
returning a UDP packet from a different IP address than it was
sent to.
Note that when
.Nm
is controlled via systemd's socket activation,
the
.Fl h
option is ignored. In this case, you need to edit
the
.Nm ListenStream
and
.Nm ListenDgram
definitions in
.Nm /usr/lib/systemd/system/rpcbind.socket
instead.
.It Fl i
.Dq Insecure
mode.
Allow calls to SET and UNSET from any host.
Normally
.Nm
accepts these requests only from the loopback interface for security reasons.
This change is necessary for programs that were compiled with earlier
versions of the rpc library and do not make those requests using the
loopback interface.
.It Fl l
Turn on libwrap connection logging.
.It Fl s
Cause
.Nm
to change to the user daemon as soon as possible.
This causes
.Nm
to use non-privileged ports for outgoing connections, preventing non-privileged
clients from using
.Nm
to connect to services from a privileged port.
.It Fl w
Cause
.Nm
to do a "warm start" by read a state file when
.Nm
starts up. The state file is created when
.Nm
terminates.
.It Fl r
Turn on remote calls. Cause
.Nm
to open up random listening ports. Note that rpcinfo need this feature turned on
for work properly. (This flag is a Debian extension.)
.El
.Sh FILES
If "/etc/default/rpcbind" exists, rpcbind will use the specified options at launch time
.Nm
Otherwise rpcbind will try to load configuration from "/etc/rppcbind.conf"
.Nm
The default options are set as "-w -f".
.Sh NOTES
All RPC servers must be restarted if
.Nm
is restarted.
.Sh SEE ALSO
.Xr rpcinfo 8
.Sh LINUX PORT
Aurelien Charbon <aurelien.charbon@bull.net>