Class: Resolv::DNS::Requester::TCP

Inherits:

Resolv::DNS::Requester

• Object
• Resolv::DNS::Requester
• Resolv::DNS::Requester::TCP

show all

Defined in:

lib/resolv.rb

Overview

Defined Under Namespace

Classes: Sender

Instance Method Summary (collapse)

• - (Object) close
• - (TCP) initialize(host, port = Port) constructor

  A new instance of TCP.

• - (Object) recv_reply(readable_socks)
• - (Object) sender(msg, data, host = @host, port = @port)

Methods inherited from Resolv::DNS::Requester

#request

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# File 'lib/resolv.rb', line 777

def initialize(host, port=Port)
  super()
  @host = host
  @port = port
  sock = TCPSocket.new(@host, @port)
  @socks = [sock]
  sock.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) if defined? Fcntl::F_SETFD
  @senders = {}
end

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# File 'lib/resolv.rb', line 811

def close
  super
  @senders.each_key {|from,id|
    DNS.free_request_id(@host, @port, id)
  }
end

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# File 'lib/resolv.rb', line 787

def recv_reply(readable_socks)
  len = readable_socks[0].read(2).unpack('n')[0]
  reply = @socks[0].read(len)
  return reply, nil
end

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# File 'lib/resolv.rb', line 793

def sender(msg, data, host=@host, port=@port)
  unless host == @host && port == @port
    raise RequestError.new("host/port don't match: #{host}:#{port}")
  end
  id = DNS.allocate_request_id(@host, @port)
  request = msg.encode
  request[0,2] = [request.length, id].pack('nn')
  return @senders[[nil,id]] = Sender.new(request, data, @socks[0])
end