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-.\" Copyright (c) 1991, 1993, 1995
-.\" The Regents of the University of California. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd April 9, 1995
-.Dt YPBIND 8
-.Os
-.Sh NAME
-.Nm ypbind
-.Nd "NIS domain binding daemon"
-.Sh SYNOPSIS
-.Nm
-.Op Fl ypset
-.Op Fl ypsetme
-.Op Fl s
-.Op Fl m
-.Oo
-.Fl S
-.Sm off
-.Ar domainname , server1 , server2 , ...
-.Sm on
-.Oc
-.Sh DESCRIPTION
-The
-.Nm
-utility is the process that maintains NIS binding information.
-At startup,
-it searches for an NIS server responsible for serving the system's
-default domain (as set by the
-.Xr domainname 1
-command) using network broadcasts.
-Once it receives a reply,
-it will store the address of the server and other
-information in a special file located in
-.Pa /var/yp/binding .
-The NIS routines in the standard C library can then use this file
-when processing NIS requests.
-There may be several such files
-since it is possible for an NIS client to be bound to more than
-one domain.
-.Pp
-After a binding has been established,
-.Nm
-will send DOMAIN_NONACK requests to the NIS server at one minute
-intervals.
-If it fails to receive a reply to one of these requests,
-.Nm
-assumes that the server is no longer running and resumes its network
-broadcasts until another binding is established.
-The
-.Nm
-utility will also log warning messages using the
-.Xr syslog 3
-facility each time it detects that a server has stopped responding,
-as well as when it has bound to a new server.
-.Pp
-The following options are available:
-.Bl -tag -width indent
-.It Fl ypset
-It is possible to force
-.Nm
-to bind to a particular NIS server host for a given domain by using the
-.Xr ypset 8
-command.
-However,
-.Nm
-refuses YPBINDPROC_SETDOM requests by default since it has no way of
-knowing exactly who is sending them.
-Using the
-.Fl ypset
-flag causes
-.Nm
-to accept YPBINDPROC_SETDOM requests from any host.
-This option should only
-be used for diagnostic purposes and only for limited periods since allowing
-arbitrary users to reset the binding of an NIS client poses a severe
-security risk.
-.It Fl ypsetme
-This is similar to the
-.Fl ypset
-flag, except that it only permits YPBINDPROC_SETDOM requests to be processed
-if they originated from the local host.
-.It Fl s
-Cause
-.Nm
-to run in secure mode: it will refuse to bind to any NIS server
-that is not running as root (i.e., that is not using privileged
-TCP ports).
-.It Fl S Xo
-.Sm off
-.Ar domainname , server1 , server2 , server3 , ...
-.Sm on
-.Xc
-Allow the system administrator to lock
-.Nm
-to a particular
-domain and group of NIS servers.
-Up to ten servers can be specified.
-There must not be any spaces between the commas in the domain/server
-specification.
-This option is used to ensure that the system binds
-only to one domain and only to one of the specified servers, which
-is useful for systems that are both NIS servers and NIS
-clients: it provides a way to restrict what machines the system can
-bind to without the need for specifying the
-.Fl ypset
-or
-.Fl ypsetme
-options, which are often considered to be security holes.
-The specified
-servers must have valid entries in the local
-.Pa /etc/hosts
-file.
-IP addresses may be specified in place of hostnames.
-If
-.Nm
-cannot make sense out of the arguments, it will ignore
-the
-.Fl S
-flag and continue running normally.
-.Pp
-Note that
-.Nm
-will consider the domainname specified with the
-.Fl S
-flag to be the system default domain.
-.It Fl m
-Cause
-.Nm
-to use a 'many-cast' rather than a broadcast for choosing a server
-from the restricted mode server list.
-In many-cast mode,
-.Nm
-will transmit directly to the YPPROC_DOMAIN_NONACK procedure of the
-servers specified in the restricted list and bind to the server that
-responds the fastest.
-This mode of operation is useful for NIS clients on remote subnets
-where no local NIS servers are available.
-The
-.Fl m
-flag can only be used in conjunction with the
-.Fl S
-flag above (if used without the
-.Fl S
-flag, it has no effect).
-.El
-.Sh NOTES
-The
-.Nm
-utility will not make continuous attempts to keep secondary domains bound.
-If a server for a secondary domain fails to respond to a ping,
-.Nm
-will broadcast for a new server only once before giving up.
-If a
-client program attempts to reference the unbound domain,
-.Nm
-will try broadcasting again.
-By contrast,
-.Nm
-will automatically maintain a binding for the default domain whether
-client programs reference it ot not.
-.Sh FILES
-.Bl -tag -width /etc/rc.conf -compact
-.It Pa /var/yp/binding/[domainname].[version]
-the files used to hold binding information for each NIS domain
-.It Pa /etc/rc.conf
-system configuration file where the system default domain and
-ypbind startup options are specified
-.El
-.Sh SEE ALSO
-.Xr domainname 1 ,
-.Xr syslog 3 ,
-.Xr yp 8 ,
-.Xr ypserv 8 ,
-.Xr ypset 8
-.Sh AUTHORS
-.An Theo de Raadt Aq deraadt@fsa.ca
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