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From: "me at ruff dot mobi" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug network/14967] getaddrinfo(NULL) with AI_PASSIVE returns 0.0.0.0 and :: (in this order)
Date: Sat, 23 Feb 2013 18:53:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14967

me at ruff dot mobi changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |me at ruff dot mobi
            Version|2.15                        |2.17
           See Also|                            |https://launchpad.net/bugs/
                   |                            |673708

--- Comment #1 from me at ruff dot mobi 2013-02-23 18:52:55 UTC ---
Here's how rfc3484_sort arguments look like

a1 = {dest_addr = 0x603010, 
    source_addr = {
        sin6_family = 10, sin6_port = 1153, sin6_flowinfo = 0, 
        sin6_addr = {
            __in6_u = {
                    __u6_addr8 = '\000' <repeats 15 times>, "\001", 
                __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 256}, 
                __u6_addr32 = {0, 0, 0, 16777216}
            }
        }, 
        sin6_scope_id = 0
    }, 
      source_addr_len = 28 '\034', 
    got_source_addr = true, 
    source_addr_flags = 0 '\000', 
    prefixlen = 128 '\200', 
    index = 1, native = -1
}
a2 = {dest_addr = 0x603070, 
    source_addr = {
        sin6_family = 2, sin6_port = 44220, sin6_flowinfo = 16777343, 
        sin6_addr = {
            __in6_u = {
                    __u6_addr8 =
"\000\000\000\000\000\000\000\000\000\000\377\377\177\000\000\001", 
                __u6_addr16 = {0, 0, 0, 0, 0, 65535, 127, 256}, 
                __u6_addr32 = {0, 0, 4294901760, 16777343}
            }
        }, 
        sin6_scope_id = 0
    }, 
    source_addr_len = 16 '\020', 
    got_source_addr = true, 
    source_addr_flags = 0 '\000', 
    prefixlen = 8 '\b', 
    index = 1, native = -1
}

Definitely "1660   /* Rule 5: Prefer matching label.  */" prefers a2 - it has
same lablel for SRC & DST, while a1 has 0 (lo) for SRC and 3 (any) for DST.
In other words here is a collision between implementation, default behaviour of
connect() and RFC recommended default labels definition. Either new label
should be attached to IPv4 loopback
label ::ffff:0f00:1/128 8 (gai.conf)
or getaddrinfo should reset loopback to any in SRC before sorting.

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