This is a getaddrinfo() flag that is defined thusly in RFC 3493:
If the AI_ADDRCONFIG flag is specified, IPv4 addresses shall be
returned only if an IPv4 address is configured on the local system,
and IPv6 addresses shall be returned only if an IPv6 address is
configured on the local system. The loopback address is not
considered for this case as valid as a configured address.
For example, when using the DNS, a query for AAAA records should
occur only if the node has at least one IPv6 address configured
(other than IPv6 loopback) and a query for A records should occur
only if the node has at least one IPv4 address configured (other
than the IPv4 loopback).
The flag is set by default when hints is NULL.
ok Eric Faurot, Jason McIntyre
about cert checking in OpenSSH. Man page wording tweaks thanks to
jmc@.
ok henning@, jmc@; positive feedback from djm@, ajacoutat@
Committing now to reuse guenther@'s libc minor bump instead of
cranking it again, as suggested by deraadt@.
draft-ietf-ipngwg-rfc2553bis-03.txt. backward compatibility concern:
- should be safe to change signed to unsigned, as we never return
negative value.
- sizeof(int) is 4 for all archs, so there's no size change with socklen_t
(= u_int32_t)
commented by deraadt.
is changed, based on discussion in ipngwg scoped address cabal.
past code: fe80::1@de0
now: de0%fe80::1
this will be in sync with next extended address format proposal
(which should be final - I don't want to make this kind of change again).
removed functionality:
new code will not return AF_LOCAL addrinfo struct.
added funtionality:
SOCK_RAW is permitted as ai_socktype (no servname allowed).
draft-ietf-ipngwg-scopedaddr-format-00.txt
deraadt