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Development tooling for the Mob mobile framework
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lib/mob_dev/network.ex
defmodule MobDev.Network do
@moduledoc "Network utilities for mob_dev."
@doc """
Returns the first LAN IPv4 address found on this machine, or nil.
Skips loopback. Matches 10.x, 192.168.x, and 172.16-31.x ranges.
"""
@spec lan_ip() :: :inet.ip4_address() | nil
def lan_ip do
case :inet.getif() do
{:ok, ifaces} ->
ifaces
|> Enum.map(fn {ip, _broadcast, _mask} -> ip end)
|> first_lan_ip()
_ ->
nil
end
end
@doc "Returns the first LAN IP from a list of IP tuples, or nil."
@spec first_lan_ip([:inet.ip4_address()]) :: :inet.ip4_address() | nil
def first_lan_ip(ips), do: Enum.find(ips, &lan_ip?/1)
@doc "Returns true if the IP tuple is a private LAN address (non-loopback)."
@spec lan_ip?(:inet.ip_address()) :: boolean()
def lan_ip?({127, _, _, _}), do: false
def lan_ip?({10, _, _, _}), do: true
def lan_ip?({172, b, _, _}), do: b >= 16 and b <= 31
def lan_ip?({192, 168, _, _}), do: true
def lan_ip?(_), do: false
end