Description of problem:

On a host with IPV4-only interfaces, getaddrinfo() still returns AF_INET6
addresses even if the AI_ADDRCONFIG flag is specified.

Version-Release number of selected component (if applicable):

2.7

How reproducible:

always

Steps to Reproduce:

1. Invoke getaddrinfo() to look up a hostname with both AF_INET and AF_INET6
addresses, on a host that has only IPv4 connectivity.

Actual results:

getaddrinfo() will return both IPv6 and IPv4 addresses.

Expected results:

Only IPv4 addresses should be returned.

Additional info:

This is because in Fedora, the loopback interface is set up with the IPv6
loopback address ::1, in addition to 127.0.0.1. As such, getaddrinfo() thinks
that the host has IPv6 connectivity. Essentially, the AI_ADDRCONFIG flag is
always ignored.

Given the intent of the AI_ADDRCONFIG flag, getaddrinfo() should skip loopback
interfaces, when evaluating the AI_ADDRCONFIG flag.