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

Thursday, 29 November 2007

rhafer(a)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/

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