.\" Copyright 1989 AT&T
.\" Copyright 1991 Sun Microsystems, Inc.
.Dd August 31, 2023
.Dt RPCBIND 8
.Os
.Sh NAME
.Nm rpcbind
.Nd universal addresses to RPC program number mapper
.Sh SYNOPSIS
.Nm
.Op Fl 6adiLlNswW
.Op Fl h Ar bindip
.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 6
Bind to AF_INET6 (IPv6) addresses only.
.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 not fork when it starts, will print 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 h Ar bindip
IP addresses to bind to when servicing TCP and UDP requests.
This option
may be specified multiple times and is typically necessary when running
on a multi-homed host.
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 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.
.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
Allow old-style local connections over the loopback interface.
Without this flag, local connections are only allowed over a local socket,
.Pa /var/run/rpcbind.sock .
.It Fl l
Turn on libwrap connection logging.
.It Fl N
Run in foreground mode.
In this mode,
.Nm
will not fork when it starts.
.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
Enable libwrap (TCP wrappers) support.
.It Fl w
Enable the warmstart feature.
.Pp
The warmstart feature saves RPC registrations on termination.
Any saved RPC registrations are restored on restart if
.Fl w
is specified.
This feature helps avoid RPC service interruption when restarting
.Nm .
warmstart support must be compiled in to
.Nm .
Portmap registrations are stored in
.Pa /tmp/portmap.file .
.Nm
registrations are stored in
.Pa /tmp/rpcbind.file .
.El
.Sh NOTES
All RPC servers must be restarted if
.Nm
is restarted.
.Sh FILES
.Bl -tag -width /var/run/rpcbind.sock -compact
.It Pa /tmp/portmap.file
saved portmap registrations file.
.It Pa /tmp/rpcbind.file
saved
.Nm
registrations file.
.It Pa /var/run/rpcbind.sock
socket used for local connections.
.El
.Sh SEE ALSO
.Xr rpcbind 3 ,
.Xr netconfig 5 ,
.Xr rpcinfo 8