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# --
# Copyright 2007 Nominet UK
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ++
require_relative 'spec_helper'
require 'socket'
class TestTcp < Minitest::Test
def test_TCP
res = Dnsruby::Resolver.new()
res.use_tcp = true
ret=res.query("example.com")
assert(ret.is_a?(Dnsruby::Message))
end
def test_TCP_port
# Need a test server so we can tell what port this message was actually sent on!
port = nil
src_port = 57923
Dnsruby::PacketSender.clear_caches
received_port = nil
server_thread = Thread.new {
ts = TCPServer.new(0)
port = ts.addr[1]
t = ts.accept
# Check that the source port was src_port
received_port = t.peeraddr()[1]
packet = t.recvfrom(2)[0]
len = (packet[0]<<8)+packet[1]
if (RUBY_VERSION >= "1.9")
len = (packet[0].getbyte(0)<<8)+packet[1].getbyte(0)# Ruby 1.9
end
packet = t.recvfrom(len)[0]
tcpPacket = Dnsruby::Message.decode(packet)
tcpPacket.header.tc = true
lenmsg = [tcpPacket.encode.length].pack('n')
t.send(lenmsg, 0)
t.write(tcpPacket.encode)
t.close
ts.close
}
ret = nil
sleep(1)
client_thread = Thread.new {
# res = Dnsruby::SingleResolver.new("127.0.0.1")
res = Dnsruby::SingleResolver.new("localhost")
res.port = port
res.use_tcp = true
res.src_port=src_port
ret=res.query("example.com")
}
server_thread.join
client_thread.join
assert(received_port == src_port)
assert(ret.is_a?(Dnsruby::Message))
end
# def test_no_tcp
# # Try to get a long response (which is truncated) and check that we have
# @TODO@ FIX THIS TEST!!!
# # tc bit set
# res = Dnsruby::Resolver.new()
# res.udp_size = 512
# res.no_tcp = true
# ret = res.query("overflow.dnsruby.validation-test-servers.nominet.org.uk", Dnsruby::Types.TXT)
# assert(ret.header.tc, "Message should be truncated with no TCP")
# end
class HackMessage < Dnsruby::Message
def wipe_additional
@additional = Dnsruby::Section.new(self)
end
# Decode the encoded message
def HackMessage.decode(m)
o = HackMessage.new()
begin
Dnsruby::MessageDecoder.new(m) {|msg|
o.header = Dnsruby::Header.new(msg)
o.header.qdcount.times {
question = msg.get_question
o.question << question
}
o.header.ancount.times {
rr = msg.get_rr
o.answer << rr
}
o.header.nscount.times {
rr = msg.get_rr
o.authority << rr
}
o.header.arcount.times { |count|
start = msg.index
rr = msg.get_rr
if (rr.type == Dnsruby::Types::TSIG)
if (count!=o.header.arcount-1)
Dnsruby.log.Error("Incoming message has TSIG record before last record")
raise Dnsruby::DecodeError.new("TSIG record present before last record")
end
o.tsigstart = start # needed for TSIG verification
end
o.additional << rr
}
}
rescue Dnsruby::DecodeError => e
# So we got a decode error
# However, we might have been able to fill in many parts of the message
# So let's raise the DecodeError, but add the partially completed message
e.partial_message = o
raise e
end
return o
end
end
def test_bad_truncation
# Some servers don't do truncation properly.
# Make a UDP server which returns large badly formatted packets (arcount > num_additional), with TC bit set
# And make a TCP server which returns large well formatted packets
# Then make sure that Dnsruby recieves response correctly.
Dnsruby::PacketSender.clear_caches
socket = UDPSocket.new
socket.bind("127.0.0.1", 0)
port = socket.addr[1]
Thread.new {
s = socket.recvfrom(65536)
received_query = s[0]
socket.connect(s[1][2], s[1][1])
ans = HackMessage.decode(received_query)
ans.wipe_additional
100.times {|i|
ans.add_additional(Dnsruby::RR.create("example.com 3600 IN A 1.2.3.#{i}"))
}
ans.header.arcount = 110
ans.header.tc = true
socket.send(ans.encode,0)
}
server_thread = Thread.new {
ts = TCPServer.new(port)
t = ts.accept
packet = t.recvfrom(2)[0]
len = (packet[0]<<8)+packet[1]
if (RUBY_VERSION >= "1.9")
len = (packet[0].getbyte(0)<<8)+packet[1].getbyte(0)# Ruby 1.9
end
packet = t.recvfrom(len)[0]
tcpPacket = HackMessage.decode(packet)
tcpPacket.wipe_additional
110.times {|i|
tcpPacket.add_additional(Dnsruby::RR.create("example.com 3600 IN A 1.2.3.#{i}"))
}
lenmsg = [tcpPacket.encode.length].pack('n')
t.send(lenmsg, 0)
t.write(tcpPacket.encode)
t.close
ts.close
}
# Now send query
res = Dnsruby::Resolver.new("127.0.0.1")
res.port = port
res.udp_size = 4096
assert(res.udp_size == 4096)
ret = res.query("example.com")
assert(ret.header.arcount == 110)
count = 0
ret.additional.each {|rr| count += 1}
assert(count == 110)
end
# @TODO@ Check stuff like persistent sockets
end
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