143 lines
2.9 KiB
Lua
143 lines
2.9 KiB
Lua
-- Configuration
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local lookup_dhcp_leases = true
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local dhcp_leases_file = "/tmp/dhcp.leases"
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local lookup_ip_neigh = true
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local non_fqdn = true
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local network_domain = ".lan"
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local output_file = "/tmp/dyndns"
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local reload_command = "/etc/init.d/dnsmasq reload"
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function split(inputstr, sep)
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if sep == nil then
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sep = "%s"
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end
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local t={}
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for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
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table.insert(t, str)
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end
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return t
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end
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function new()
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return {hostname = "?", ip = {}}
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end
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function contains(tab, val)
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for index, value in ipairs(tab) do
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if value == val then
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return true
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end
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end
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return false
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end
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function ipv4(ip)
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local chunks = {ip:match("(%d+)%.(%d+)%.(%d+)%.(%d+)")}
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if (#chunks == 4) then
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for _,v in pairs(chunks) do
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if (tonumber(v) < 0 or tonumber(v) > 255) then
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return false
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end
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end
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return true
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else
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return false
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end
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end
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function ipv6(ip)
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local _, chunks = ip:gsub("[%a%d]+%:?", "")
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if chunks == 8 then
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return true
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end
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return false
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end
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function count(T)
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local count = 0
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for _ in pairs(T) do count = count + 1 end
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return count
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end
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function read_file(path)
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local file = io.open(path, "rb")
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if not file then return nil end
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local content = file:read "*a"
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file:close()
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return content
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end
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array = {}
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if lookup_dhcp_leases then
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local dhcp_file = assert(io.popen('cat ' .. dhcp_leases_file, 'r'))
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local dhcp_table = split(dhcp_file:read('*all'), "\r\n")
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dhcp_file:close()
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for key,value in pairs(dhcp_table) do
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local dhcp_lease = split(value, " ")
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local mac = dhcp_lease[2]
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if not array[mac] then
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array[mac] = new()
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array[mac]["hostname"] = dhcp_lease[4]
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end
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if not contains(array[mac]["ip"], dhcp_lease[3]) then
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table.insert(array[mac]["ip"], dhcp_lease[3])
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end
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end
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end
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if lookup_ip_neigh then
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local neigh_file = assert(io.popen('ip neigh', 'r'))
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local neigh_table = split(neigh_file:read('*all'), "\r\n")
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neigh_file:close()
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for key,value in pairs(neigh_table) do
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local neigh = split(value, " ")
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local mac = neigh[5]
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local ip = neigh[1]
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if mac and ip then
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if not array[mac] then
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array[mac] = new()
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end
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if not contains(array[mac]["ip"], ip) then
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table.insert(array[mac]["ip"], ip)
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end
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end
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end
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end
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config = ""
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for key,value in pairs(array) do
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local mac = key
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local ip = value["ip"]
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local hostname = value["hostname"]
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if hostname ~= "?" and hostname ~= "*" then
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for key,value in pairs(ip) do
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line = value
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if non_fqdn then line = line .. " " .. hostname end
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if network_domain then line = line .. " " .. (hostname .. "." .. network_domain) end
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if line ~= value then config = config .. "\r\n" .. line end
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end
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end
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end
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if read_file(output_file) ~= config then
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file = io.open(output_file, "w")
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file:write(config)
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file:close()
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os.execute(reload_command)
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end |