Identify all relevant ip addresses from ruby Socket.ip_address_list - ruby

Question

When using rubies Socket.ip_address_list, it will return an array of addr_info (https://ruby-doc.org/stdlib-2.0.0/libdoc/socket/rdoc/Addrinfo.html)
Example:
require 'socket'
addr_infos = Socket.ip_address_list
This array could be iterated and listed by all defined ip_addresses and attributes like
addr_infos.each do |addr_info|
puts "#{addr_info.ip_address}
#{addr_info.ipv4? ? 'ipv4? ' : ''}" +
"#{addr_info.ipv4_loopback? ? 'ipv4_loopback? ' : ''}" +
"#{addr_info.ipv4_private? ? 'ipv4_private? ' : ''}" +
"#{addr_info.ipv4_multicast? ? 'ipv4_multicast? ' : ''}" +
"#{addr_info.ipv6? ? 'ipv6? ' : '' }" +
"#{addr_info.ipv6_loopback? ? 'ipv6_loopback? ' : ''}" +
"#{addr_info.ipv6_linklocal? ? 'ipv6_linklocal? ' : ''}" +
"#{addr_info.ipv6_multicast? ? 'ipv6_multicast? ' : ''}" +
"#{addr_info.ipv6_sitelocal? ? 'ipv6_sitelocal? ' : ''}" +
"#{addr_info.ipv6_unique_local? ? 'ipv6_unique_local? ' : ''}" +
"#{addr_info.ipv6_mc_global? ? 'ipv6_mc_global? ' : ''}" +
"#{addr_info.ipv6_unspecified? ? 'ipv6_unspecified? ' : ''}"
end
The result will look like
127.0.0.1
ipv4? ipv4_loopback?
192.168.178.33
ipv4? ipv4_private?
1.2.4.5
ipv4?
::1
ipv6? ipv6_loopback?
fe80::1%lo0
ipv6? ipv6_linklocal?
fe80::aede:48ff:fe00:1122%en5
ipv6? ipv6_linklocal?
fe80::68:e785:4cfb:41e6%en0
ipv6? ipv6_linklocal?
fe80::50fc:46ff:fe4c:c2b4%awdl0
ipv6? ipv6_linklocal?
fe80::3203:d609:ff08:151d%utun0
ipv6? ipv6_linklocal?
fd00::ffff:aaaa:bbbb:7005
ipv6? ipv6_unique_local?
2003:ffff:4723:aaaa:bbbb:8888:269a:42a4
ipv6?
Q: How to identify "correct" ip-addresses to bind listening services to?
IMHO it would be easy to identify the IPv4 addresses like:
IPv4 = ipv4? && (ipv4_loopback? || ipv4_private? || !(ipv4_loopback? || ipv4_private? || ipv4_multicast?))
But in case of those many ipv6_? attributes I wondering what to to check to identify the IPv6 addresses.
Is this the correct suggestion?
It is an IPv6 address when:
a. ipv6? is true and no other ipv6_...? attribute is true
b. ipv6? and ipv6_loopback? are true
c. ipv6? and ipv6_unique_local are true
Do I miss something from IPv6 addresses?

Answer 1

This is my current solution in addition to this question. Maybe some may add a comment or vote to make sure that this goes the right direction
ip_addresses_for_host = []
Socket.ip_address_list.each do |a|
# test for all local valid ipv4 and ipv6 ip_addresses
# check question on stackoverflow for details
# https://stackoverflow.com/questions/59770803/identify-all-relevant-ip-addresses-from-ruby-socket-ip-address-list
ip_addresses_for_host << a.ip_address if \
(a.ipv4? &&
(a.ipv4_loopback? || a.ipv4_private? ||
!(a.ipv4_loopback? || a.ipv4_private? || a.ipv4_multicast?)
)
) ||
(a.ipv6? &&
(a.ipv6_loopback? || a.ipv6_unique_local? ||
!(a.ipv6_loopback? || a.ipv6_unique_local? || a.ipv6_linklocal? || a.ipv6_multicast? || a.ipv6_sitelocal? ||
a.ipv6_mc_global? || a.ipv6_mc_linklocal? || a.ipv6_mc_nodelocal? || a.ipv6_mc_orglocal? || a.ipv6_mc_sitelocal? ||
a.ipv6_v4compat? || a.ipv6_v4mapped? || a.ipv6_unspecified?)
)
)
end
This will resolve for IPv4:
a. 127.0.0.1
b. private addresses like 192.168./16, 10./8, ...
c. other ipv4 addresses like 1.2.3.4
and for IPv6:
a. ::1
b. fc00::
c. abcd::
Appreciate if someone would add more knowledge.