Examples with DnsMessageEncoder org.apache.directory.server.dns.io.encoder.DnsMessageEncoder used on opensource projects

Example 1 with DnsMessageEncoder

use of org.apache.directory.server.dns.io.encoder.DnsMessageEncoder in project netty by netty.

the class DnsNameResolverTest method testTruncated0.

private static void testTruncated0(boolean tcpFallback, final boolean truncatedBecauseOfMtu) throws IOException {
    final String host = "somehost.netty.io";
    final String txt = "this is a txt record";
    final AtomicReference<DnsMessage> messageRef = new AtomicReference<DnsMessage>();
    TestDnsServer dnsServer2 = new TestDnsServer(new RecordStore() {

        @Override
        public Set<ResourceRecord> getRecords(QuestionRecord question) {
            String name = question.getDomainName();
            if (name.equals(host)) {
                return Collections.<ResourceRecord>singleton(new TestDnsServer.TestResourceRecord(name, RecordType.TXT, Collections.<String, Object>singletonMap(DnsAttribute.CHARACTER_STRING.toLowerCase(), txt)));
            }
            return null;
        }
    }) {

        @Override
        protected DnsMessage filterMessage(DnsMessage message) {
            // Store a original message so we can replay it later on.
            messageRef.set(message);
            if (!truncatedBecauseOfMtu) {
                // Create a copy of the message but set the truncated flag.
                DnsMessageModifier modifier = modifierFrom(message);
                modifier.setTruncated(true);
                return modifier.getDnsMessage();
            }
            return message;
        }
    };
    dnsServer2.start();
    DnsNameResolver resolver = null;
    ServerSocket serverSocket = null;
    try {
        DnsNameResolverBuilder builder = newResolver().queryTimeoutMillis(10000).resolvedAddressTypes(ResolvedAddressTypes.IPV4_PREFERRED).maxQueriesPerResolve(16).nameServerProvider(new SingletonDnsServerAddressStreamProvider(dnsServer2.localAddress()));
        if (tcpFallback) {
            // If we are configured to use TCP as a fallback also bind a TCP socket
            serverSocket = new ServerSocket();
            serverSocket.setReuseAddress(true);
            serverSocket.bind(new InetSocketAddress(dnsServer2.localAddress().getPort()));
            builder.socketChannelType(NioSocketChannel.class);
        }
        resolver = builder.build();
        if (truncatedBecauseOfMtu) {
            resolver.ch.pipeline().addFirst(new ChannelInboundHandlerAdapter() {

                @Override
                public void channelRead(ChannelHandlerContext ctx, Object msg) {
                    if (msg instanceof DatagramPacket) {
                        // Truncate the packet by 1 byte.
                        DatagramPacket packet = (DatagramPacket) msg;
                        packet.content().writerIndex(packet.content().writerIndex() - 1);
                    }
                    ctx.fireChannelRead(msg);
                }
            });
        }
        Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> envelopeFuture = resolver.query(new DefaultDnsQuestion(host, DnsRecordType.TXT));
        if (tcpFallback) {
            // If we are configured to use TCP as a fallback lets replay the dns message over TCP
            Socket socket = serverSocket.accept();
            InputStream in = socket.getInputStream();
            // skip length field
            assertTrue((in.read() << 8 | (in.read() & 0xff)) > 2);
            int txnId = in.read() << 8 | (in.read() & 0xff);
            IoBuffer ioBuffer = IoBuffer.allocate(1024);
            // Must replace the transactionId with the one from the TCP request
            DnsMessageModifier modifier = modifierFrom(messageRef.get());
            modifier.setTransactionId(txnId);
            new DnsMessageEncoder().encode(ioBuffer, modifier.getDnsMessage());
            ioBuffer.flip();
            ByteBuffer lenBuffer = ByteBuffer.allocate(2);
            lenBuffer.putShort((short) ioBuffer.remaining());
            lenBuffer.flip();
            while (lenBuffer.hasRemaining()) {
                socket.getOutputStream().write(lenBuffer.get());
            }
            while (ioBuffer.hasRemaining()) {
                socket.getOutputStream().write(ioBuffer.get());
            }
            socket.getOutputStream().flush();
            // Let's wait until we received the envelope before closing the socket.
            envelopeFuture.syncUninterruptibly();
            socket.close();
            serverSocket.close();
        }
        AddressedEnvelope<DnsResponse, InetSocketAddress> envelope = envelopeFuture.syncUninterruptibly().getNow();
        assertNotNull(envelope.sender());
        DnsResponse response = envelope.content();
        assertNotNull(response);
        assertEquals(DnsResponseCode.NOERROR, response.code());
        int count = response.count(DnsSection.ANSWER);
        assertEquals(1, count);
        List<String> texts = decodeTxt(response.recordAt(DnsSection.ANSWER, 0));
        assertEquals(1, texts.size());
        assertEquals(txt, texts.get(0));
        if (tcpFallback) {
            assertFalse(envelope.content().isTruncated());
        } else {
            assertTrue(envelope.content().isTruncated());
        }
        assertTrue(envelope.release());
    } finally {
        dnsServer2.stop();
        if (resolver != null) {
            resolver.close();
        }
    }
}