fix bug when registering with domain name

Author: nilsver

resources/libraries/update_hosts_file.rb

@@ -1,5 +1,7 @@
 module RbProxy
   module Helpers
+    require 'resolv'
+
     def read_hosts_file
       hosts_hash = Hash.new { |hash, key| hash[key] = [] }
       File.readlines('/etc/hosts').each do |line|
@@ -13,7 +15,7 @@ def read_hosts_file
     end
 
     def update_hosts_file
-      manager_registration_ip = node['redborder']['manager_registration_ip'] if node['redborder'] && node['redborder']['manager_registration_ip']
+      manager_registration_ip = managerToIp(node['redborder']['manager_registration_ip']) if node['redborder'] && node['redborder']['manager_registration_ip']
 
       return unless manager_registration_ip
 
@@ -53,5 +55,21 @@ def update_hosts_file
       end
       hosts_entries
     end
+
+    def managerToIp(str)
+      ipv4_regex = /\A(\d{1,3}\.){3}\d{1,3}\z/
+      ipv6_regex = /\A(?:[A-Fa-f0-9]{1,4}:){7}[A-Fa-f0-9]{1,4}\z/
+      dns_regex = /\A[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+\z/
+
+      return str if str =~ ipv4_regex || str =~ ipv6_regex
+
+      if str =~ dns_regex
+        begin
+          return Resolv.getaddress(str).to_s
+        rescue Resolv::ResolvError
+          return nil
+        end
+      end
+    end
   end
 end