Fiat lux

lib/dyndnsd/database.rb

@@ -0,0 +1,32 @@
+
+require 'forwardable'
+
+module Dyndnsd
+  class Database
+    extend Forwardable
+    
+    def_delegators :@db, :[], :[]=, :each, :has_key?
+  
+    def initialize(db_file)
+      @db_file = db_file
+    end
+    
+    def load
+      if File.file?(@db_file)
+        @db = JSON.load(File.open(@db_file, 'r') { |f| f.read })
+      else
+        @db = {}
+      end
+      @db_hash = @db.hash
+    end
+    
+    def save
+      File.open(@db_file, 'w') { |f| JSON.dump(@db, f) }
+      @db_hash = @db.hash
+    end
+    
+    def changed?
+      @db_hash != @db.hash
+    end
+  end
+end

lib/dyndnsd/generator/bind.rb

@@ -0,0 +1,29 @@
+
+module Dyndnsd
+  module Generator
+    class Bind
+      def initialize(config)
+        @ttl = config['ttl']
+        @origin = config['origin']
+        @dns = config['dns']
+        @email_addr = config['email_addr']
+      end
+
+      def generate(zone)
+        out = []
+        out << "$TTL #{@ttl}"
+        out << "$ORIGIN #{@origin}"
+        out << ""
+        out << "@ IN SOA #{@dns} #{@email_addr} ( #{zone['serial']} 3h 5m 1w 1h )"
+        out << "@ IN NS #{@dns}"
+        out << ""
+        zone['hosts'].each do |hostname,ip|
+          name = hostname.chomp('.' + @origin[0..-2])
+          out << "#{name} IN A #{ip}"
+        end
+        out << ""
+        out.join("\n")
+      end
+    end
+  end
+end

lib/dyndnsd/responder/rest_style.rb

@@ -0,0 +1,19 @@
+
+module Dyndnsd
+  module Responder
+    class RestStyle
+      def response_for(state)
+        # general http errors
+        return [405, {"Content-Type" => "text/plain"}, ["Method Not Allowed"]] if state == :method_forbidden
+        return [404, {"Content-Type" => "text/plain"}, ["Not Found"]] if state == :not_found
+        # specific errors
+        return [422, {"Content-Type" => "text/plain"}, ["Hostname missing"]] if state == :hostname_missing
+        return [403, {"Content-Type" => "text/plain"}, ["Forbidden"]] if state == :host_forbidden
+        return [422, {"Content-Type" => "text/plain"}, ["Hostname malformed"]] if state == :hostname_malformed
+        # OKs
+        return [200, {"Content-Type" => "text/plain"}, ["Good"]] if state == :good
+        return [200, {"Content-Type" => "text/plain"}, ["No change"]] if state == :nochg
+      end
+    end
+  end
+end

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -0,0 +1,21 @@
+
+module Dyndnsd
+  module Updater
+    class CommandWithBindZone
+      def initialize(config)
+        @zone_file = config['zone_file']
+        @command = config['command']
+        @generator = Generator::Bind.new(config)
+      end
+      
+      def update(zone)
+        # write zone file in bind syntax
+        File.open(@zone_file, 'w') { |f| f.write(@generator.generate(zone)) }
+        # call user-defined command
+        pid = fork do
+          exec @command
+        end
+      end
+    end
+  end
+end

lib/dyndnsd/version.rb

@@ -0,0 +1,4 @@
+
+module Dyndnsd
+  VERSION = "0.0.1"
+end