[Bug network/14969] New: getaddrinfo() with AI_ADDRCONFIG replaces ::1 with 127.0.0.1

["psimerda at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14969

             Bug #: 14969
           Summary: getaddrinfo() with AI_ADDRCONFIG replaces ::1 with
                    127.0.0.1
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: psimerda@redhat.com
    Classification: Unclassified


getaddrinfo() with AI_ADDRCONFIG replaces all ::1 with 127.0.0.1 on hosts
without non-loopback IPv6 addresses. See the following test result:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
qlen 1000
    link/ether f0:de:f1:b8:6a:ee brd ff:ff:ff:ff:ff:ff
    inet 84.246.161.88/28 brd 84.246.161.95 scope global eth0

getaddrinfo host="None" hints.ai_flags=AI_ADDRCONFIG:
  ::1
  127.0.0.1
getaddrinfo host="localhost" hints.ai_flags=AI_ADDRCONFIG:
  127.0.0.1
  127.0.0.1
getaddrinfo host="127.0.0.1" hints.ai_flags=AI_ADDRCONFIG:
  127.0.0.1
getaddrinfo host="localhost4" hints.ai_flags=AI_ADDRCONFIG:
  127.0.0.1
getaddrinfo host="::1" hints.ai_flags=AI_ADDRCONFIG:
  ::1
getaddrinfo host="localhost6" hints.ai_flags=AI_ADDRCONFIG:
  127.0.0.1
getaddrinfo host="195.47.235.3" hints.ai_flags=AI_ADDRCONFIG:
  195.47.235.3
getaddrinfo host="2a02:38::1001" hints.ai_flags=AI_ADDRCONFIG:
  2a02:38::1001
getaddrinfo host="info.nix.cz" hints.ai_flags=AI_ADDRCONFIG:
  195.47.235.3
getaddrinfo host="www.google.com" hints.ai_flags=AI_ADDRCONFIG:
  173.194.39.81
  173.194.39.82
  173.194.39.80
  173.194.39.84
  173.194.39.83

Especially notable are:

getaddrinfo(localhost) -> 127.0.0.1, 127.0.0.1 (duplicate)
getaddrinfo(localhost6) -> 127.0.0.1 (wrong)

Contents of /etc/hosts:

127.0.0.1    localhost localhost4
::1        localhost localhost6

Looks like some sort of black magic someone was trying to solve something.

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