PDNS实现智能DNS

发布时间：May 16, 2014 // 分类：DNS // No Comments

PDNS默认不支持bind view功能，通过PowerDNS Recursor加载Lua脚本判断再递归查询PowerDNS实现智能DNS。

#关闭数据包缓存，测试时开启查询时直接读缓存不经过lua preresolve()
disable-packetcache=yes
forward-zones=com=108.61.242.102
local-address=0.0.0.0
lua-dns-script=/tmp/b.lua
#转发所有域到pdns server
forward-zones=.=127.0.0.1:54

lua：

function preresolve ( remoteip, domain, qtype )
    pdnslog("a test message.. received query "..domain.." from "..remoteip.." on "..getlocaladdress());
    ret={}
    if qtype ~= pdns.A then return -1, ret end --非A记录查询跳过，后端查询
    local ips = {"192.168.1.1/32", "10.1.0.0/16", "127.0.0.0/24"}
    if matchnetmask(remoteip, ips) and domain == "www.example.com."
        then
            ret[1]= {qtype=pdns.A, content="85.17.220.215", ttl=86400}
            setvariable()
            return 0, ret
        else
            setvariable()
            return -1, ret 
        end
    end

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