Added DynDNS
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DynDNS/README.md
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DynDNS/README.md
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# DynDNS
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Dynamic DNS records can be used for assigning hostnames to local devices.
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It combines **DHCPv4 server leases** with **IP neigh** and add ALL device addresses to DNS hostnames.
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Can be used for assinging **RA addresses to device hostnames**, which are defaultly **NOT** assigned in OpenWrt.
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Add this script to **dnsmasq's dhcp-script** option:
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```
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dhcp-script = lua /path/to/dyndns.lua
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```
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Or via dhcpscript in uci:
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```
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config dnsmasq
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option dhcpscript 'lua /path/to/dyndns.lua'
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```
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Also add `list addnhosts '/tmp/dyndns'` to make dnsmasq using DynDNS's hosts file.
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DynDNS/dyndns.lua
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DynDNS/dyndns.lua
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-- 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 = "chata.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 print_table(node)
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local cache, stack, output = {},{},{}
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local depth = 1
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local output_str = "{\n"
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while true do
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local size = 0
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for k,v in pairs(node) do
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size = size + 1
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end
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local cur_index = 1
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for k,v in pairs(node) do
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if (cache[node] == nil) or (cur_index >= cache[node]) then
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if (string.find(output_str,"}",output_str:len())) then
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output_str = output_str .. ",\n"
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elseif not (string.find(output_str,"\n",output_str:len())) then
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output_str = output_str .. "\n"
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end
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-- This is necessary for working with HUGE tables otherwise we run out of memory using concat on huge strings
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table.insert(output,output_str)
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output_str = ""
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local key
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if (type(k) == "number" or type(k) == "boolean") then
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key = "["..tostring(k).."]"
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else
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key = "['"..tostring(k).."']"
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end
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if (type(v) == "number" or type(v) == "boolean") then
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output_str = output_str .. string.rep('\t',depth) .. key .. " = "..tostring(v)
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elseif (type(v) == "table") then
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output_str = output_str .. string.rep('\t',depth) .. key .. " = {\n"
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table.insert(stack,node)
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table.insert(stack,v)
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cache[node] = cur_index+1
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break
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else
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output_str = output_str .. string.rep('\t',depth) .. key .. " = '"..tostring(v).."'"
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end
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if (cur_index == size) then
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output_str = output_str .. "\n" .. string.rep('\t',depth-1) .. "}"
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else
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output_str = output_str .. ","
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end
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else
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-- close the table
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if (cur_index == size) then
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output_str = output_str .. "\n" .. string.rep('\t',depth-1) .. "}"
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end
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end
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cur_index = cur_index + 1
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end
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if (size == 0) then
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output_str = output_str .. "\n" .. string.rep('\t',depth-1) .. "}"
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end
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if (#stack > 0) then
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node = stack[#stack]
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stack[#stack] = nil
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depth = cache[node] == nil and depth + 1 or depth - 1
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else
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break
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end
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end
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-- This is necessary for working with HUGE tables otherwise we run out of memory using concat on huge strings
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table.insert(output,output_str)
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output_str = table.concat(output)
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print(output_str)
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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 ~= "?" then
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for key,value in pairs(ip) do
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if non_fqdn then config = config .. "\r\n" .. value .. " " .. hostname end
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if network_domain then config = config .. "\r\n" .. value .. " " .. hostname .. "." .. network_domain end
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end
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end
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end
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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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