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lib/mdns_lite/utilities.ex
defmodule MdnsLite.Utilities do
@moduledoc false
@doc """
Return a network interface's IP addresses
* `ifaddrs` - the return value from `:inet.getifaddrs/0`
"""
@spec ifaddrs_to_ip_list(
[{ifname :: charlist(), ifopts :: keyword()}],
ifname :: String.t()
) :: [:inet.ip_address()]
def ifaddrs_to_ip_list(ifaddrs, ifname) do
ifname_cl = to_charlist(ifname)
case List.keyfind(ifaddrs, ifname_cl, 0) do
nil ->
[]
{^ifname_cl, params} ->
Keyword.get_values(params, :addr)
end
end
@doc """
Return whether the IP address is IPv4 (:inet) or IPv6 (:inet6)
"""
@spec ip_family(:inet.ip_address()) :: :inet | :inet6
def ip_family({_, _, _, _}), do: :inet
def ip_family({_, _, _, _, _, _, _, _}), do: :inet6
@doc """
Strip the flag bit off the class value
This is required since OTP doesn't know about it and will return numbers rather than the
the `:in` class.
"""
@spec normalize_class(:in | 0..65535) :: :in | 0..65535
def normalize_class(32769), do: :in
def normalize_class(other), do: other
end