(8th July 2018) I have decided to discontinue development of pdns-mrubybackend.

pdns-mrubybackend

What is pdns-mrubybackend

pdns-mrubybackend is backend extension module using Scripting Language mruby for PowerDNS.

Notice

Current code of pdns-mrubybackend does not work for pdns-3.x. If you want to use with pdns-3.x , please use v1.3.0

Install

Please use build.sh

sh ./build.sh
sudo cp src/mrubybackend.so /usr/lib64/pdns/

Examples

1. rand response

   pdns-backend.rb

   def lookup
     Powerdns::answer.clear
   
     records = [
       {"name"=>"example.com",     "type"=>"SOA" ,"content"=>"ns.example.com. hostmaster.example.com. 1 1800 900 604800 3600",},
       {"name"=>"rand.example.com","type"=>"TXT" ,"content"=>rand.to_s,},
     ]
   
     records.each{|rec|
       if( rec["name"] == Powerdns::Request::domain && (Powerdns::Request::type == "ANY" || rec["type"] == Powerdns::Request::type) )
         Powerdns::answer.push( rec )
       end
     }
   end

   response

   $ dig @172.17.42.53 ANY rand.example.com.
   
   ;; QUESTION SECTION:
   ;rand.example.com.      IN  ANY
   
   ;; ANSWER SECTION:
   rand.example.com.   120 IN  TXT "0.2835277512864"

2. MaxMindDB(GeoIP) balancing

   using with mruby-maxminddb.

   pdns-backend.rb

   $mmdb = MaxMindDB.new "/tmp/GeoLite2-City.mmdb"
   def lookup
     Powerdns::answer.clear
   
     $mmdb.lookup_string "#{Powerdns::Request::remote_addr}"
     cc = $mmdb.country_code
   
     records = [
       {"name"=>"example.com"     ,"type"=>"SOA" ,"content"=>"ns.example.com. hostmaster.example.com. 1 1800 900 604800 3600",},
       {"name"=>"geo.example.com" ,"type"=>"TXT" ,"content"=>"COMMENT: Your country is "+cc,},
       {"name"=>"geo.example.com" ,"type"=>"A"   ,"content"=>({"JP"=>"172.17.43.80","US"=>"172.17.44.80","TW"=>"172.17.45.80"}[cc]||"172.17.46.80")},
     ]
   
     records.each{|rec|
       if( rec["name"] == Powerdns::Request::domain && (Powerdns::Request::type == "ANY" || rec["type"] == Powerdns::Request::type) )
         Powerdns::answer.push( rec )
       end
     }
   end

   response

   dig @172.17.42.53 ANY geo.example.com.
   
   ;; QUESTION SECTION:
   ;geo.example.com.       IN  ANY
   
   ;; ANSWER SECTION:
   geo.example.com.    120 IN  TXT "COMMENT: Your country is US"
   geo.example.com.    120 IN  A   172.17.44.80

License

under the MIT License:

• http://www.opensource.org/licenses/mit-license.php