Class: Rubber::Dns::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/rubber/dns/base.rb

Direct Known Subclasses

Dyndns, Nettica, Zerigo

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env) ⇒ Base

Returns a new instance of Base.



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# File 'lib/rubber/dns/base.rb', line 8

def initialize(env)
  @env = env
end

Instance Attribute Details

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/rubber/dns/base.rb', line 6

def env
  @env
end

Instance Method Details

#create_host_record(host, ip) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 54

def create_host_record(host, ip)
  raise "create_host_record not implemented"
end

#destroy(host) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 26

def destroy(host)
  if host_exists?(host)
    puts "Destroying dynamic DNS record: #{host}"
    destroy_host_record(host)
  end
end

#destroy_host_record(host) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 58

def destroy_host_record(host)
  raise "destroy_host_record not implemented"
end

#host_exists?(host) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubber/dns/base.rb', line 50

def host_exists?(host)
  raise "host_exists? not implemented"
end

#hostname(host) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 33

def hostname(host)
  "#{host}.#{@env.domain}"
end

#nameserver ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 46

def nameserver()
  raise "nameserver not implemented"
end

#up_to_date(host, ip) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 37

def up_to_date(host, ip)
  # This queries dns server directly instead of using hosts file
  current_ip = nil
  Resolv::DNS.open(:nameserver => [nameserver], :search => [], :ndots => 1) do |dns|
    current_ip = dns.getaddress(hostname(host)).to_s rescue nil
  end
  return ip == current_ip
end

#update(host, ip) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 12

def update(host, ip)
  if up_to_date(host, ip)
    puts "IP has not changed for #{host}, not updating dynamic DNS"
  else
    if ! host_exists?(host)
      puts "Creating dynamic DNS: #{host} => #{ip}"
      create_host_record(host, ip)
    else
      puts "Updating dynamic DNS: #{host} => #{ip}"
      update_host_record(host, ip)
    end
  end
end

#update_host_record(host, ip) ⇒ Object 



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# File 'lib/rubber/dns/base.rb', line 62

def update_host_record(host, ip)
  raise "update_host_record not implemented"
end