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YPSERV(8)               NetBSD System Manager's Manual               YPSERV(8)


NAME

     ypserv - YP server daemon


SYNOPSIS

     ypserv [-a aclfile] [-d] [-x]


DESCRIPTION

     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 db(3) database. A number of YP maps
     is 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 occured named /var/yp/securenet. It contains networks the
     server can assume is secure. For information about file format see
     securenet(5).

     Before the author of this server had seen securenet(5) another format was
     implemented ypserv.acl(5).  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).

     The file used can be reread by sending a SIGHUP to ypserv. The process
     pid can be found in the file /var/run/ypserv.pid.

     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.

     The options are as follows:

     -a aclfile
             Don't use /var/yp/securenet. Use another file with another file
             format. For further information see ypserv.acl(5).

     -d      Use internet Domain Name System. If a query to map hosts.byname
             or hosts.byaddr fails, make a DNS query and return the result if
             successful.

     -x      Terminate the server after processing aclfile or
             /var/yp/securenet.


FILES

     /var/yp/ypserv.log
     /var/yp/securenet
     /var/run/ypserv.pid


SEE ALSO

     securenet(5),  ypserv.acl(5),  yp(8),  ypbind(8),  ypinit(8).


AUTHOR

     This implementation of ypserv was originally written by Mats O Jansson
     <moj@stacken.kth.se>.  The access control list code was later re-written
     from scratch by Jason R. Thorpe <thorpej@NetBSD.ORG>.

4.4BSD                           June 27, 1994                               1