[Lua] YAMAHAルータでDDNS (MyDNSJP)にグルーバルIPアドレスを通知する

rtx_update_myddnsjp.lua

-- This Lua script is tells DDNS (MyDNSJP) the global IP address on the YAMAHA RTX router
-- Value
ddnsid = "userid"
ddnspass = "password"

ddnsurl = "https://www.mydns.jp/directip.html"
gipv4url = "https://inet-ip.info/ip"
msg_prefix = "[DDNS] rtx_update_myddnsjp.lua "

-- Get Globle IP address info
req_gipv4 = {
    url = gipv4url,
    method = "GET"
}
rsp_gipv4 = rt.httprequest(req_gipv4)

if rsp_gipv4.code ~= 200 then
    msg_sufix = "(Error) Failed to get global IP address info: " ..gipv4url
    rt.syslog("info", msg_prefix..msg_sufix)
    return
end

-- Update IP address to DDNS
update_ddnsurl = ddnsurl.."?MID="..ddnsid.."\&PWD="..ddnspass.."\&IPV4ADDR="..rsp_gipv4.body

req_update_ddns = {
    url = update_ddnsurl,
    method = "GET"
}
rsp_update_ddns = rt.httprequest(req_update_ddns)

-- NOTE:May be necessary to change the conditional expression
if string.match(rsp_update_ddns.body,"Login.and.IP.address.notify.OK\.") then
    msg_sufix = "(Info) Successful upload global IP address to DDNS"
    rt.syslog("info", msg_prefix..msg_sufix)
else
    msg_sufix = "(Error) Failed to upload global IP address to DDNS"
    rt.syslog("info", msg_prefix..msg_sufix)
end
return

• YAMAHA RTX830 (Lua5.1系実装)で実行実施済み
• DDNSの通知結果をHTTPステータスコードで判断不可だったので、HTTP body内の文字列で判断 (33行目)

• DDNS通知後の条件式を変更、以前の文字列だと不十分のため