Example usage for io.netty.handler.codec.dns DnsSection QUESTION

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In this page you can find the example usage for io.netty.handler.codec.dns DnsSection QUESTION.

Prototype

DnsSection QUESTION

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The section that contains DnsQuestion s.

Usage

From source file:io.vertx.core.dns.impl.DnsClientImpl.java

License:Open Source License

@SuppressWarnings("unchecked")
private <T> void lookup(String name, Future<List<T>> result, DnsRecordType... types) {
    Objects.requireNonNull(name, "no null name accepted");
    bootstrap.connect(dnsServer).addListener(new RetryChannelFutureListener(result) {
        @Override/*from  w w w . j  a  v a  2 s. c om*/
        public void onSuccess(ChannelFuture future) throws Exception {
            DatagramDnsQuery query = new DatagramDnsQuery(null, dnsServer,
                    ThreadLocalRandom.current().nextInt());
            for (DnsRecordType type : types) {
                query.addRecord(DnsSection.QUESTION, new DefaultDnsQuestion(name, type, DnsRecord.CLASS_IN));
            }
            future.channel().writeAndFlush(query).addListener(new RetryChannelFutureListener(result) {
                @Override
                public void onSuccess(ChannelFuture future) throws Exception {
                    future.channel().pipeline().addLast(new SimpleChannelInboundHandler<DnsResponse>() {
                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, DnsResponse msg)
                                throws Exception {
                            DnsResponseCode code = DnsResponseCode.valueOf(msg.code().intValue());

                            if (code == DnsResponseCode.NOERROR) {

                                int count = msg.count(DnsSection.ANSWER);

                                List<T> records = new ArrayList<>(count);
                                for (int idx = 0; idx < count; idx++) {
                                    DnsRecord a = msg.recordAt(DnsSection.ANSWER, idx);
                                    T record = RecordDecoder.decode(a);
                                    if (isRequestedType(a.type(), types)) {
                                        records.add(record);
                                    }
                                }

                                if (records.size() > 0 && (records.get(0) instanceof MxRecordImpl
                                        || records.get(0) instanceof SrvRecordImpl)) {
                                    Collections.sort((List) records);
                                }

                                setResult(result, records);
                            } else {
                                setFailure(result, new DnsException(code));
                            }
                            ctx.close();
                        }

                        private boolean isRequestedType(DnsRecordType dnsRecordType, DnsRecordType[] types) {
                            for (DnsRecordType t : types) {
                                if (t.equals(dnsRecordType)) {
                                    return true;
                                }
                            }
                            return false;
                        }

                        @Override
                        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
                                throws Exception {
                            setFailure(result, cause);
                            ctx.close();
                        }
                    });
                }
            });
        }
    });
}

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From source file:io.vertx.core.dns.impl.fix.DnsQueryContext.java

License:Apache License

void query() {
    final DnsQuestion question = question();
    final InetSocketAddress nameServerAddr = nameServerAddr();
    final DatagramDnsQuery query = new DatagramDnsQuery(null, nameServerAddr, id);

    query.setRecursionDesired(recursionDesired);

    query.addRecord(DnsSection.QUESTION, question);

    for (DnsRecord record : additional) {
        query.addRecord(DnsSection.ADDITIONAL, record);
    }//w w w. j  a v  a 2  s  .co m
    if (optResource != null) {
        query.addRecord(DnsSection.ADDITIONAL, optResource);
    }

    if (logger.isDebugEnabled()) {
        logger.debug("{} WRITE: [{}: {}], {}", parent.ch, id, nameServerAddr, question);
    }

    sendQuery(query);
}

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From source file:io.vertx.core.dns.impl.fix.DnsQueryContext.java

License:Apache License

void finish(AddressedEnvelope<? extends DnsResponse, InetSocketAddress> envelope) {
    final DnsResponse res = envelope.content();
    if (res.count(DnsSection.QUESTION) != 1) {
        logger.warn("Received a DNS response with invalid number of questions: {}", envelope);
        return;/*from ww w  . j av  a 2  s  .c  o  m*/
    }

    if (!question().equals(res.recordAt(DnsSection.QUESTION))) {
        logger.warn("Received a mismatching DNS response: {}", envelope);
        return;
    }

    setSuccess(envelope);
}

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