table of contents
RPCBIND(8) | System Manager's Manual | RPCBIND(8) |
NAME¶
rpcbind
—
universal addresses to RPC program number
mapper
SYNOPSIS¶
rpcbind |
[-adhiLlsr ] |
DESCRIPTION¶
The rpcbind
utility is a
server that converts RPC program numbers into universal
addresses. It must be running on the host to be able to make
RPC calls on a server on that machine.
When an RPC service is started, it
tells rpcbind
the address at which it
is listening, and the RPC program numbers it is
prepared to serve. When a client wishes to make an RPC
call to a given program number, it first contacts
rpcbind
on the server machine to
determine the address where RPC requests should be
sent.
The rpcbind
utility
should be started before any other RPC service. Normally,
standard RPC servers are started by port monitors, so
rpcbind
must be started before port
monitors are invoked.
When rpcbind
is started,
it checks that certain name-to-address translation-calls function
correctly. If they fail, the network configuration databases may be
corrupt. Since RPC services cannot function correctly
in this situation, rpcbind
reports the
condition and terminates.
The rpcbind
utility can
only be started by the super-user.
OPTIONS¶
-a
- When debugging
(
-d
), do an abort on errors. -d
- Run in debug mode. In this mode,
rpcbind
will log additional information during operation, and will abort on certain errors if-a
is also specified. With this option, the name-to-address translation consistency checks are shown in detail. -f
- Do not fork and become a background process.
-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
-h
,rpcbind
will automatically add127.0.0.1
and if IPv6 is enabled,::1
to the list. If no-h
option is specified,rpcbind
will bind toINADDR_ANY
, which could lead to problems on a multi-homed host due torpcbind
returning a UDP packet from a different IP address than it was sent to. Note that whenrpcbind
is controlled via systemd's socket activation, the-h
option is ignored. In this case, you need to edit theListenStream
andListenDgram
definitions in/usr/lib/systemd/system/rpcbind.socket
instead. -i
- “Insecure” mode. Allow calls
to SET and UNSET from any host. Normally
rpcbind
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. -l
- Turn on libwrap connection logging.
-s
- Cause
rpcbind
to change to the user daemon as soon as possible. This causesrpcbind
to use non-privileged ports for outgoing connections, preventing non-privileged clients from usingrpcbind
to connect to services from a privileged port. -w
- Cause
rpcbind
to do a "warm start" by read a state file whenrpcbind
starts up. The state file is created whenrpcbind
terminates. -r
- Turn on remote calls. Cause
rpcbind
to open up random listening ports. Note that rpcinfo need this feature turned on for work properly. (This flag is a Debian extension.)
FILES¶
If "/etc/default/rpcbind" exists, rpcbind will use
the specified options at launch time
rpcbind
Otherwise rpcbind will try to load
configuration from "/etc/rppcbind.conf"
rpcbind
The default options are set as
"-w -f".
NOTES¶
All RPC servers must be restarted if
rpcbind
is restarted.
SEE ALSO¶
LINUX PORT¶
Aurelien Charbon <aurelien.charbon@bull.net>
September 14, 1992 | Debian |