Bug 14212 – getaddrinfo() with multiple results from /etc/hosts and AF_INET6 in hints fails when /etc/hosts.conf:multi=off

Bug 14212 - getaddrinfo() with multiple results from /etc/hosts and AF_INET6 in hints fails when /etc/hosts.conf:multi=off


Summary:	getaddrinfo() with multiple results from /etc/hosts and AF_INET6 in hints fai...

Status:	NEW

Product:	glibc
Classification:	Unclassified
Component:	network
Version:	2.15

Importance:	P2 normal
Target Milestone:	---
Assigned To:	Not yet assigned to anyone

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2012-06-09 05:15 UTC by Mike Frysinger
Modified:	2013-04-15 13:11 UTC (History)
CC List:	1 user (show)

See Also:
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Last reconfirmed:

Attachments
getaddrinfo test (745 bytes, text/plain) 2012-06-09 05:15 UTC, Mike Frysinger	Details
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Description Mike Frysinger 2012-06-09 05:15:17 UTC

Created attachment 6444 [details]
getaddrinfo test

i have these /etc settings:

$ cat /etc/hosts
127.0.0.1   localhost
::1         localhost

$ cat /etc/host.conf 
order hosts, bind
multi off

trying to do getaddrinfo("localhost") when hints is just set to
ai_family=AF_INET6 fails with EAI_NODATA when it should have returned ::1

if i change multi on, then i get back ::1 as expected

if i also use ai_flags=AI_V4MAPPED, then multi off gives me ::ffff:127.0.0.1 --
which is correct, just pointing out that it seems to be matching the first
result and then aborting because the hints didn't line up

see attached code:
$ gcc getaddrinfo.c && ./a.out localhost

Comment 1 Siddhesh Poyarekar 2013-04-15 13:11:27 UTC

I cannot reproduce this with latest master.

$ cat /etc/hosts
127.0.0.1   localhost
::1         localhost

$ cat /etc/host.conf
order hosts, bind
multi off

$ ./a.out localhost
this is an IPv6 result
this is an IPv6 result
this is an IPv6 result