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1.\" $OpenBSD: ypserv.8,v 1.9 1997/09/04 00:43:19 deraadt Exp $
2.\" Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
3.\" All rights reserved.
4.\"
5.\" Redistribution and use in source and binary forms, with or without
6.\" modification, are permitted provided that the following conditions
7.\" are met:
8.\" 1. Redistributions of source code must retain the above copyright
9.\" notice, this list of conditions and the following disclaimer.
10.\" 2. Redistributions in binary form must reproduce the above copyright
11.\" notice, this list of conditions and the following disclaimer in the
12.\" documentation and/or other materials provided with the distribution.
13.\" 3. All advertising materials mentioning features or use of this software
14.\" must display the following acknowledgement:
15.\" This product includes software developed by Mats O Jansson
16.\" 4. The name of the author may not be used to endorse or promote products
17.\" derived from this software without specific prior written permission.
18.\"
19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29.\" SUCH DAMAGE.
30.\"
31.Dd June 27, 1994
32.Dt YPSERV 8
33.Os
34.Sh NAME
35.Nm ypserv
36.Nd YP server daemon
37.Sh SYNOPSIS
38.Nm ypserv
39.Op Fl 1
40.Op Fl a Ar aclfile
41.Op Fl d
42.Op Fl x
43.Sh DESCRIPTION
44.Nm Ypserv
45is a fundamental part of the network information system called YP.
46This server provides information from YP maps to the YP clients
47on the network.
48.Pp
49A YP map is stored on the server as a
50.Xr db 3
51database. A number of YP maps is grouped together in a domain.
52.Ar Ypserv
53determines the domains it serves by looking for a directory with
54the domain name in
55.Ar /var/yp .
56.Pp
57YP hasn't been known for high security through the years. In recent years
58security has improved by restricting access to the server. In SunOS 4.1
59has a new file occured named
60.Ar /var/yp/securenet .
61It contains networks the server can assume is secure. For information about
62file format see
63.Xr securenet 5 .
64.Pp
65Before the author of this server had seen
66.Xr securenet 5
67another format was implemented
68.Xr ypserv.acl 5 .
69This file format makes it possible to allow and deny hosts and networks
70access to the server. This file can have any name since it's given by
71the argument to
72.Fl a
73(use full path).
74.Pp
75The file used can be reread by sending a SIGHUP to ypserv. The process pid
76can be found in the file
77.Nm /var/run/ypserv.pid
78.
79.Pp
80If a host isn't secure all queries to the server will result in a YP_NODOM
81result.
82.Pp
83If the file
84.Nm /var/yp/ypserv.log
85exists then messages will be written to the file.
86.Pp
87If a directory named the same as the system domainname exists in
88.Nm /var/yp/
89(ie. the domainname is
90.Nm foo
91and directory
92.Nm /var/yp/foo
93exists), then ypserv will be automatically started at boot time.
94.Pp
95The options are as follows:
96.Bl -tag -width indent
97.It Fl 1
98Allow ypserv to answer old YP version 1 requests.
99.It Fl a Ar aclfile
100Don't use
101.Ar /var/yp/securenet .
102Use another file with another file format. For futher information see
103man page for
104.Ar ypserv.acl .
105.It Fl d
106Use Internet Domain Name System. If a query to map
107.Ar hosts.byname
108or
109.Ar hosts.byaddr
110fails, make a DNS query and return the result if successful.
111Alternately, if these maps were built on the YP master using
112.Nm makedbm
113.Fl b
114then DNS queries will be done without needing to specify
115.Fl d .
116.It Fl x
117Terminate the server after processing
118.Ar aclfile
119or
120.Ar /var/yp/securenet .
121.El
122.Sh FILES
123.Bl -tag -width /var/yp/ypserv.log -compact
124.It Pa /var/yp/ypserv.log
125.It Pa /var/yp/securenet
126.It Pa /var/run/ypserv.pid
127.El
128.Sh SEE ALSO
129.Xr yp 8 ,
130.Xr ypserv.acl 5 ,
131.Xr securenet 5 ,
132.Xr ypbind 1
133.Sh AUTHOR
134Mats O Jansson <moj@stacken.kth.se>