[krbdev.mit.edu #3107] AI_NUMERICSERV conflicts with "discard" getaddrinfo hack (AIX 5)

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>Submitter-Id:	@SUBMITTER@
>Originator:	Donn Cave
>Organization:
	University of Washington
>Confidential:	no
>Synopsis:	AI_NUMERICSERV conflicts with "discard" getaddrinfo hack (AIX 5)
>Severity:	serious
>Priority:	medium
>Category:	krb5-libs
>Class:		sw-bug
>Release:	krb5-1.4.1
>Environment:
	AIX 5.2, cc
System: AIX melville 3 4 00600210C000


>Description:
	When os/locate_kdc.c uses AI_NUMERICSERV, it creates a conflict
	with the NUMERIC_SERVICE_BROKEN hack that replaces the numeric
	service with "discard".  This happens on AIX 5.2, which defines
	AI_NUMERICSERV and rejects "discard" with that flag set.  I was
	hoping #3083 was about this, but current snapshot still has the
	code.
>How-To-Repeat:
	define NUMERIC_SERVICE_BROKEN and DNS lookup on a platform that
	defines AI_NUMERICSERV.
>Fix:
	I added a test for flags & AI_NUMERICSERV before the "discard"
	hack.  I don't know if NUMERIC_SERVICE_BROKEN applies to current
	patch levels of any AIX release, couldn't duplicate it.  Service
	lookup never made any sense to me to start with, though.  A null
	pointer works instead of "discard", too.