Re: (ITS#5251) getaddrinfo might return duplicate results

[hyc@symas.com]

rhafer@suse.de wrote:
> Full_Name: Ralf Haferkamp
> Version: All
> OS: Linux, glibc 2.7
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (89.166.161.148)
> 
> 
> Newer versions of glibc (2.7) in my case might return duplicate addrinfo structs
> in the results under certain circumstances. According to the friendly glibc
> maintainer ;) this is not a bug:
> http://sources.redhat.com/bugzilla/show_bug.cgi?id=4980
> Unfortunately he doesn't give a reason for this change in behavior.

Interesting. In that bug report the /etc/hosts file has 127.0.0.1 once and ::1 
once, so why is 127.0.0.1 being returned twice? That is clearly bogus.

> BTW, I didn't find any reference in the related RFCs that state that the
> getaddrinfo results need to be unique (nor the opposite).
> In my current builds I simply patched slapd to check the getaddrinfo() results
> for uniqueness in the slap_get_listner_addresses() function. Has anybody a
> better idea how to fix this?

I'm sure there's nothing that states that the returned info is required to be 
unique. The returned data must accurately reflect the host databases being 
queried though. If you put "127.0.0.1 localhost" twice in /etc/hosts, then 
it's reasonable to get it returned twice. But if it's only in there once, then 
returning it twice is a bug.
-- 
   -- Howard Chu
   Chief Architect, Symas Corp.  http://www.symas.com
   Director, Highland Sun        http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP     http://www.openldap.org/project/