YPSERV(8) | System Manager's Manual | YPSERV(8) |
ypserv
— YP server
daemon
ypserv |
[-1dx ] [-a
aclfile] |
ypserv
is a fundamental part of the
network information system called YP. This server provides information from
YP maps to the YP clients on the network.
A YP map is stored on the server as a Berkeley database. A number
of YP maps are grouped together in a domain. ypserv
determines the domains it serves by looking for a directory with the domain
name in /var/yp.
YP hasn't been known for high security through the years. In recent years security has improved by restricting access to the server. In SunOS 4.1 has a new file occurred named /var/yp/securenet. It contains networks the server can assume is secure. For information about the file format, see securenet(5).
Before the author of this server had seen
securenet(5) another
format, ypserv.acl(5),
was implemented. This file format makes it possible to allow and deny hosts
and networks access to the server. This file can have any name since it's
given by the argument to -a
(use full path).
If a host isn't secure, all queries to the server will result in a YP_NODOM result.
If the file /var/yp/ypserv.log exists then messages will be written to the file.
If a directory named the same as the system domainname exists in
/var/yp (i.e., the domainname is “foo”
and the directory /var/yp/foo exists), then
ypserv
will be automatically started at boot
time.
On receipt of a hangup signal, SIGHUP
,
ypserv
will reopen the log file and reread its
configuration, including both the map files and the
ypserv.acl(5) or
securenet(5) configuration
file.
The options are as follows:
-1
ypserv
to answer old YP version 1
requests.-a
aclfile-d
makedbm
-b
then DNS queries will be done without needing
to specify -d
.-x
dbopen(3), securenet(5), ypserv.acl(5), Makefile.yp(8), yp(8), ypbind(8)
Mats O Jansson <moj@stacken.kth.se>
November 1, 2020 | OpenBSD-7.0 |