Example usage for io.netty.handler.codec.dns DnsRecordType CNAME

Introduction

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

Prototype

DnsRecordType CNAME

To view the source code for io.netty.handler.codec.dns DnsRecordType CNAME.

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Document

Canonical name record RFC 1035 Alias of one name to another: the DNS lookup will continue by retrying the lookup with the new name.

Usage

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

License:Open Source License

@Override
public DnsClient resolveCNAME(String name, Handler<AsyncResult<List<String>>> handler) {
    lookupList(name, handler, DnsRecordType.CNAME);
    return this;
}

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

License:Apache License

void onResponse(final DnsQuestion question, AddressedEnvelope<DnsResponse, InetSocketAddress> envelope) {
    try {/*from   w  w w .  j av  a  2 s.  c o  m*/
        final DnsResponse res = envelope.content();
        final DnsResponseCode code = res.code();
        if (code == DnsResponseCode.NOERROR) {
            final DnsRecordType type = question.type();
            if (type == DnsRecordType.A || type == DnsRecordType.AAAA) {
                onResponseAorAAAA(type, question, envelope);
            } else if (type == DnsRecordType.CNAME) {
                onResponseCNAME(question, envelope);
            }
            return;
        }

        if (traceEnabled) {
            addTrace(envelope.sender(), "response code: " + code + " with " + res.count(DnsSection.ANSWER)
                    + " answer(s) and " + res.count(DnsSection.AUTHORITY) + " authority resource(s)");
        }

        // Retry with the next server if the server did not tell us that the domain does not exist.
        if (code != DnsResponseCode.NXDOMAIN) {
            query(nameServerAddrs.next(), question);
        }
    } finally {
        ReferenceCountUtil.safeRelease(envelope);
    }
}

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

License:Apache License

private static Map<String, String> buildAliasMap(DnsResponse response) {
    final int answerCount = response.count(DnsSection.ANSWER);
    Map<String, String> cnames = null;
    for (int i = 0; i < answerCount; i++) {
        final DnsRecord r = response.recordAt(DnsSection.ANSWER, i);
        final DnsRecordType type = r.type();
        if (type != DnsRecordType.CNAME) {
            continue;
        }/*from   ww w  .  j a  v a2 s  .c om*/

        if (!(r instanceof DnsRawRecord)) {
            continue;
        }

        final ByteBuf recordContent = ((ByteBufHolder) r).content();
        final String domainName = decodeDomainName(recordContent);
        if (domainName == null) {
            continue;
        }

        if (cnames == null) {
            cnames = new HashMap<String, String>();
        }

        cnames.put(r.name().toLowerCase(Locale.US), domainName.toLowerCase(Locale.US));
    }

    return cnames != null ? cnames : Collections.<String, String>emptyMap();
}

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

License:Apache License

void tryToFinishResolve() {
    if (!queriesInProgress.isEmpty()) {
        // There are still some queries we did not receive responses for.
        if (gotPreferredAddress()) {
            // But it's OK to finish the resolution process if we got a resolved address of the preferred type.
            finishResolve();//from   w w w.  ja  v  a 2  s .  c o m
        }

        // We did not get any resolved address of the preferred type, so we can't finish the resolution process.
        return;
    }

    // There are no queries left to try.
    if (resolvedEntries == null) {
        // .. and we could not find any A/AAAA records.
        if (!triedCNAME) {
            // As the last resort, try to query CNAME, just in case the name server has it.
            triedCNAME = true;
            query(nameServerAddrs.next(), new DefaultDnsQuestion(hostname, DnsRecordType.CNAME));
            return;
        }
    }

    // We have at least one resolved address or tried CNAME as the last resort..
    finishResolve();
}

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