Add a -S option to ypbind that allows the following:

     -S domainname,server1,server2,server3,...
           The -S flag allows the system administrator to lock ypbind 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 insure that
           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 ma-
           chines the system can bind to without the need for specifying the
           -ypset or -ypsetme options, which are often considered to be secu-
           rity holes. The specified servers must have valid entries in the
           local /etc/hosts file. IP addresses may be specified in place of
           hostnames. If ypbind can't make sense ouf of the arguments, it will
           ignore the -S flag and continue running normally.

           Note that ypbind will consider the domainname specified with the -S
           flag to be the system default domain.

(According to what Garrett showed me, OSF/1 actually only allows 4 servers
to be specified. Ten seemed to be a bit more reasonable to me.)

Suggested by: G. Wollman
Idea lifted from: OSF/1

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