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Date: Fri, 8 Nov 1996 20:41:59 +0900 (JST)
From: hino@nwk.cl.nec.co.jp
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: gnu/1981: ypserv handles null key incorrectly
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>Number:         1981
>Category:       gnu
>Synopsis:       ypserv handles null key incorrectly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov  8 03:50:02 PST 1996
>Last-Modified:
>Originator:     Koji Hino
>Organization:
NEC
>Release:        FreeBSD 2.1.5-RELEASE i386
>Environment:

FreeBSD leek.nwk.cl.nec.co.jp 2.1.5-RELEASE FreeBSD 2.1.5-RELEASE #0:
Thu Aug 22 14:58:12 JST 1996
taniguti@leek.nwk.cl.nec.co.jp:/usr/src/sys/compile/BIG_LEEK  i386

But...
I think that -current's non-GNU ypserv seems to have the same prob.

>Description:

While ypserv on FreeBSD works as slave NIS server, this ypserv incorrectly
handles null key entry in a specific (buggy) NIS-map. (compared with
SunOS 4 ypserv).

My master NIS server runs on Sun3, SunOS 4.1.1_U1. When I insert a
blank line to /etc/protocols, Sun's NIS system makes BAD protocols.bynumber
map which contains entry: key="".

Other slave NIS servers on Sun, handle this bad map without any problem.
But FreeBSD's NIS server can not handle the map like Sun's in following case:

* NIS client asks NIS server to get next entry of the bad entry (key="").

Sun returns correct entry, which is a just next of (key="").
FreeBSD returns first entry in the map. This results NIS clients to go loop!

I believe that most incorrect player of this problem is Sun's NIS master server
environment, but I wish that FreeBSD could treat this buggy map correctly
with some proper fixes...

>How-To-Repeat:

I do not know whether FreeBSD's NIS master server environment (Makefile,
tools) will make these bad map or not, so I can not answer...
Of caurse, I can repeat the problem in my environment easily :-)


>Fix:
	
/usr/src/gnu/usr.sbin/ypserv/server.c line 346 will be fixed..

>Audit-Trail:
>Unformatted: