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# Copyright, 2009, 2012, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require 'stringio'
require 'ipaddr'
require_relative 'message'
module RubyDNS
def self.address_family(host)
return IPAddr.new(host).family
end
# A helper class for processing incoming network data.
class BinaryStringIO < StringIO
def initialize
super
set_encoding("BINARY")
end
end
module StreamTransport
def self.read_chunk(socket)
# The data buffer:
buffer = BinaryStringIO.new
# First we need to read in the length of the packet
while buffer.size < 2
buffer.write socket.readpartial(1)
end
# Read in the length, the first two bytes:
length = buffer.string.byteslice(0, 2).unpack('n')[0]
# Read data until we have the amount specified:
while (buffer.size - 2) < length
required = (2 + length) - buffer.size
# Read precisely the required amount:
buffer.write socket.readpartial(required)
end
return buffer.string.byteslice(2, length)
end
def self.write_message(socket, message)
write_chunk(socket, message.encode)
end
def self.write_chunk(socket, output_data)
socket.write([output_data.bytesize].pack('n'))
socket.write(output_data)
return output_data.bytesize
end
end
end
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