aredn/files/usr/local/bin/nvram-setup

#! /usr/bin/lua
--[[

    Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
    Copyright (C) 2021 Tim Wilkinson
    Original Perl Copyright (C) 2015 Conrad Lara
    See Contributors file for additional contributors

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation version 3 of the License.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    Additional Terms:

    Additional use restrictions exist on the AREDN(TM) trademark and logo.
        See AREDNLicense.txt for more info.

    Attributions to the AREDN Project must be retained in the source code.
    If importing this code into a new or existing project attribution
    to the AREDN project must be added to the source code.

    You must not misrepresent the origin of the material contained within.

    Modified versions must be modified to attribute to the original source
    and be marked in reasonable ways as differentiate it from the original
    version

--]]

-- do the initial setup of the essential nvram variables
-- node - node name
-- mac2 - last 3 bytes of wifi mac address in the form ddd.ddd.ddd
-- wifi_mac - full mac address of wireless card in the form hh:hh:hh:hh:hh:hh
--
-- intended to run every boot but it should only actually do anything
-- on the first boot

require("aredn.utils")
require("iwinfo")
require("aredn.hardware")
require('aredn.info')

local wifi_mac = aredn.info.get_nvram("wifimac")
local mac2 = aredn.info.get_nvram("mac2")
local node = aredn.info.get_nvram("node")
local dtdmac = aredn.info.get_nvram("dtdmac")

local hardware_mac
if wifi_mac == "" or mac2 == "" then
    if aredn.hardware.has_wifi() then
        local phy
        for i = 1,5
        do
            for _, wlan in ipairs({ "wlan0", "wlan1" })
            do
                local f = io.popen("iwinfo " .. wlan .. " info")
                if f then
                    for line in f:lines()
                    do
                        phy = line:match("PHY name:%s*([a-z0-4]+)")
                        if phy then
                            break
                        end
                    end
                    f:close()
                end
                if phy then
                    break
                end
            end
            if phy then
                for line in io.lines("/sys/class/ieee80211/" .. phy .. "/macaddress")
                do
                    local m = line:match("(%w%w:%w%w:%w%w:%w%w:%w%w:%w%w)")
                    if m then
                        hardware_mac = m
                        break
                    end
                end
                break
            end
            sleep(5)
        end
    end
    if not hardware_mac then
        if not aredn.hardware.has_wifi() then
            -- Non wifi device, create a random mac address instead
            hardware_mac = capture([[hexdump -n5 -e'/5 "02" 5/1 ":%02X"' /dev/random]]):match("^(%S+)")
            -- Disable wifi
            os.execute("sed -i -e 's/wifi_enable = 1/wifi_enable = 0/' /etc/config.mesh/_setup")
        else
            io.stderr:write("ERROR: hardware mac not found\n")
            os.exit(-1)
        end
    end
end

if wifi_mac == "" then
    aredn.info.set_nvram("wifimac", hardware_mac)
end

if mac2 == "" then
    local a, b, c = hardware_mac:match("%w%w:%w%w:%w%w:(%w%w):(%w%w):(%w%w)")
    mac2 = string.format("%d.%d.%d", tonumber(a, 16), tonumber(b, 16), tonumber(c, 16))
    aredn.info.set_nvram("mac2", mac2)
end

if node == "" then
    aredn.info.set_nvram("node", "NOCALL-" .. mac2:gsub("%.", "-"))
end

if dtdmac == "" then
    local a, b, c = aredn.hardware.get_interface_mac(aredn.hardware.get_iface_name("lan")):match("%w%w:%w%w:%w%w:(%w%w):(%w%w):(%w%w)")
    dtdmac = string.format("%d.%d.%d", tonumber(a, 16), tonumber(b, 16), tonumber(c, 16))
    if dtdmac == mac2 then
        a = tonumber(a, 16) + 1
        if a > 255 then
            a = 0
        end
        dtdmac = string.format("%d.%d.%d", a, tonumber(b, 16), tonumber(c, 16))
    end
    aredn.info.set_nvram("dtdmac", dtdmac)
end