ROS的DDNS脚本

ROS使用ADSL上网时，每次拨号IP都会改变，导致外网访问ROS服务器失败，目前最常见的解决方案是使用DDNS这种动态域名工具，在拨号后（IP发生变化后）通知DDNS服务器更新IP，最终使用DDNS服务商提供的静态域名即可永久访问这台服务器。ROS官方仅支持changeip，但通过其它方法也可以实现支持花生壳，测试通过的脚本如下：

一、国外changeip的脚本，修改自changeip官方网站：

# Define User Variables
:global ddnsuser "user"
:global ddnspass "password"
:global ddnshost "xxxx.onmypc.org"
:global ddnsinterface "changkuan"

# Define Global Variables
:global ddnsip
:global ddnslastip

:if ([ :typeof $ddnslastip ] = nothing ) do={ :global ddnslastip "0" }

# Grab the current IP address on that interface.
:global ddnsip [ /ip address get [/ip address find interface=$ddnsinterface ] address ]
:log info $ddnsip
# Did we get an IP address to compare?
:if ([ :typeof $ddnsip ] = nil ) do={
   :log info ("DDNS: No ip address present on " . $ddnsinterface . ", please check.")
} else={

  :if ($ddnsip != $ddnslastip) do={

    :log info "DDNS: Sending UPDATE!"
    :log info [ :put [/tool dns-update name=$ddnshost address=[:pick $ddnsip 0 [:find $ddnsip "/"] ] key-name=$ddnsuser key=$ddnspass ] ]
    :global ddnslastip $ddnsip

  } else={ 
    :log info "DDNS: No update required."
  }

}

# End of script

二、国内花生壳的脚本，官方提供的脚本每次都会更新，根据上述changip脚本修改之，实现IP变化后才更新：

local server "http://ddns.oray.com"
local domain "xxxx.oicp.net"
local users "user"
local paswd "password"
local adslinterface "changkuan"
local ipaddr
:global lastipaddr

set ipaddr [/ip address get [/ip address find interface=$adslinterface] address]
:if ([ :typeof $ipaddr ] = nil ) do={
   :log info ("ORAY: No ip address present on " . $adslinterface . ", please check.")
} else={
   set ipaddr [:pick $ipaddr 0 ([len $ipaddr] -3)]   
   :log info $ipaddr
   :if ($ipaddr != $lastipaddr) do={
    local par "/ph/update?&hostname=$domain&myip=$ipaddr"
    :log info "ORAY: Sending UPDATE!"
    :log info [:put [ /tool fetch url=($server . $par) mode=http user=$users password=$paswd ] ]
    :global lastipaddr $ipaddr

  } else={ 
    :log info "ORAY: No update required."
  }
}