DNS resolver failing to find valid DNS record #8261

johnjaylward · 2018-09-04T18:47:33Z

Expected behavior

The DNS resolver should find valid DNS records.

Actual behavior

Exception thrown:

Caused by: io.netty.resolver.dns.DnsNameResolverContext$SearchDomainUnknownHostException: Search domain query failed. Original hostname: 'host.toplevel' failed to resolve 'host.toplevel.search.domain' after 7 queries 
	at io.netty.resolver.dns.DnsNameResolverContext.finishResolve(DnsNameResolverContext.java:721)
	at io.netty.resolver.dns.DnsNameResolverContext.tryToFinishResolve(DnsNameResolverContext.java:663)
	at io.netty.resolver.dns.DnsNameResolverContext.query(DnsNameResolverContext.java:306)
	at io.netty.resolver.dns.DnsNameResolverContext.query(DnsNameResolverContext.java:295)
	at io.netty.resolver.dns.DnsNameResolverContext.tryToFinishResolve(DnsNameResolverContext.java:636)
	at io.netty.resolver.dns.DnsNameResolverContext$3.operationComplete(DnsNameResolverContext.java:342)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:507)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:481)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:420)
	at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
	at io.netty.resolver.dns.DnsQueryContext.setSuccess(DnsQueryContext.java:197)
	at io.netty.resolver.dns.DnsQueryContext.finish(DnsQueryContext.java:180)
	at io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:969)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1412)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:943)
	at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)

Steps to reproduce

Configure a top level domain someDomain on a DNS server you own
Configure a host under the new top level domain someHost.someDomain
Configure multiple resolvers on the DNS client machine that will run the Netty code. i.e. 8.8.8.8, 192.168.1.1, and 10.0.0.1 (I have 3 resolvers configured, each pointing to different DNS masters - global DNS, local personal private network, company private network over a VPN)
Configure the search domain to not match the top level domain, i.e. search.otherDomain on the DNS client machine that will run the Netty code
Ask netty to resolve someHost.someDomain
failure.

Minimal yet complete reproducer code (or URL to code)

I'm not using Netty directly so I'm not sure what to put here. Do you want my Redisson code?

Netty version

Breaks when I upgrade to Reddison 3.6+ which pulls in Netty 4.1.20+
When forcing downgrade to Netty 4.1.13 the problem still shows, but with a slightly different stack trace.

JVM version (e.g. `java -version`)

java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)

OS version (e.g. `uname -a`)

Windows 10, Centos 7, Ubuntu 16.04

The text was updated successfully, but these errors were encountered:

normanmaurer · 2018-09-04T18:53:16Z

@johnjaylward would it be possible to try different netty versions and see at which point it breaks ? This would help me a lot.

johnjaylward · 2018-09-04T18:55:22Z

Are there any breaking points in the API between 4.1.13 and 4.1.20? If not, I don't see an issue with trying on my end.

normanmaurer · 2018-09-04T19:01:43Z

@johnjaylward as the dns resolver is marked as unstable there were a few, but I think most people should not be affected as the scope is small. So I would give it a try.

johnjaylward · 2018-09-04T19:49:27Z

well, now that I've played around with the versions a little more, I'm not sure what's up.
Using Redisson 3.5.0 with any version of Netty and the DNS query seems to work.

However using Redisson 3.6.0 with any version of Netty, the query fails. I'm guessing Redisson must have changed some configuration option that it is passing to the Netty resolver? Is that a possibility? If so, I'll open this on the Redisson side.

normanmaurer · 2018-09-05T17:51:25Z

@johnjaylward sure thats possible... I dont know enough about Redission to tell you what they do.

johnjaylward · 2018-09-06T16:02:07Z

Thanks, I'll check with them.

normanmaurer · 2018-09-06T16:04:00Z

@johnjaylward please let me know how it goes :)

mrniko · 2018-09-10T14:18:29Z

@johnjaylward

I would reopen this issue. Issue appeared once Redisson switched to netty based resolver from JDK's InetAddress.getByName method.

johnjaylward · 2018-09-10T15:17:17Z

Thanks for looking @mrniko .

@normanmaurer looks like it's an error in how netty is resolving.

johnjaylward · 2018-09-10T15:18:40Z

Updated title since it's not a regression.

normanmaurer · 2018-09-10T15:19:02Z

Can we somehow have a testcase to reproduce which does not involve setup an own dnsserver etc?

…

Am 10.09.2018 um 17:17 schrieb johnjaylward ***@***.***>: Reopened #8261. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

johnjaylward · 2018-09-10T15:28:33Z

I'm not sure if it's environment related or not. It appears to be environment related as it seems to resolve some host names just fine, it's just this custom top level domain one it has issues with (i.e. not localhost/.com/.edu etc which work fine).

The TLD is just "companyname" not "companyname.com" . The resolver appears to be looking at "host.companyname" and not liking the TLD, so it appends the DNS Search Domain to it (host.companyname.someOther.searchDomain), which is invalid.

Short of setting up your own DNS stack with a custom TLD to test it, I'm not sure what else to do.

johnjaylward · 2018-09-10T15:31:01Z

Maybe you can test against a public TLD like .amazon or .google or something? I'm not sure if there would be a difference there though as I have 3 resolvers configured, but only 1 will return a valid result for the custom TLD.

normanmaurer · 2018-09-10T15:35:58Z

So you say it only happens for custom TLDs?

…

Am 10.09.2018 um 17:31 schrieb johnjaylward ***@***.***>: Maybe you can test against a public TLD like .amazon or .google or something? I'm not sure if there would be a difference there though as I have 3 resolvers configured, but only 1 will return a valid result for the custom TLD. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

normanmaurer · 2018-09-11T08:35:39Z

@johnjaylward could you test to only include the dnsserver that handles the custom domainname and see if it resolves in this case ?

Also would it be possible to run the following command against each of the servers (using the domain you want to resolve) and add the output here:

dig @dnsserverip host.toplevel A

johnjaylward · 2018-09-11T19:10:50Z

Personal local network:

$ dig @192.168.55.5 host.domain A

; <<>> DiG 9.12.2-P1 <<>> @192.168.55.5 host.domain A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58575
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;host.domain.                   IN      A

;; AUTHORITY SECTION:
.                       10619   IN      SOA     a.root-servers.net. nstld.verisign-grs.com. 2018091101 1800 900 604800 86400

;; Query time: 0 msec
;; SERVER: 192.168.55.5#53(192.168.55.5)
;; WHEN: Tue Sep 11 15:05:55 Eastern Daylight Time 2018
;; MSG SIZE  rcvd: 115

Global public network:

$ dig @8.8.8.8 host.domain A

; <<>> DiG 9.12.2-P1 <<>> @8.8.8.8 host.domain A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 18400
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;host.domain.                   IN      A

;; AUTHORITY SECTION:
.                       86362   IN      SOA     a.root-servers.net. nstld.verisign-grs.com. 2018091101 1800 900 604800 86400

;; Query time: 31 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Sep 11 15:04:32 Eastern Daylight Time 2018
;; MSG SIZE  rcvd: 115

Company DNS over VPN

$ dig @10.253.48.2 host.domain A

; <<>> DiG 9.12.2-P1 <<>> @10.253.48.2 host.domain A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42724
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
; COOKIE: 065a3fc0ed8df40e (echoed)
;; QUESTION SECTION:
;host.domain.                   IN      A

;; ANSWER SECTION:
host.domain.            3600    IN      A       10.253.50.30

;; Query time: 46 msec
;; SERVER: 10.253.48.2#53(10.253.48.2)
;; WHEN: Tue Sep 11 15:08:19 Eastern Daylight Time 2018
;; MSG SIZE  rcvd: 68

$ dig @10.253.48.3 host.domain A

; <<>> DiG 9.12.2-P1 <<>> @10.253.48.3 host.domain A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19221
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
; COOKIE: 5e8dd4d92c46330d (echoed)
;; QUESTION SECTION:
;host.domain.                   IN      A

;; ANSWER SECTION:
host.domain.            3600    IN      A       10.253.50.30

;; Query time: 31 msec
;; SERVER: 10.253.48.3#53(10.253.48.3)
;; WHEN: Tue Sep 11 15:08:38 Eastern Daylight Time 2018
;; MSG SIZE  rcvd: 68

johnjaylward · 2018-09-11T19:13:40Z

@normanmaurer I'm not sure I can configure Redisson to use a specific DNS server...

normanmaurer · 2018-09-12T09:34:27Z

@johnjaylward interesting so at least one server returns NXDOMAIN. This is on what OS ? Can you also show me the contents of /etc/resolv.conf

johnjaylward · 2018-09-12T12:09:31Z

it's on windows 10 in this instance. When I was stepping through the calls the server list contained all 3 primary servers. I can't remember if it contained the secondary over the VPN. If I have time today, I'll try to step through again and see which servers were listed.

utsavchanda · 2018-09-18T06:21:24Z

I am getting similar kind of error with redisson version 3.7.2 and netty version 4.1.25.Final

Unable to resolve xxxx.redis.cache.windows.net - java.net.UnknownHostException: failed to resolve xxxx.redis.cache.windows.net' after 4 queries at io.netty.resolver.dns.DnsNameResolverContext.finishResolve(DnsNameResolverContext.java:721) at io.netty.resolver.dns.DnsNameResolverContext.tryToFinishResolve(DnsNameResolverContext.java:663) at io.netty.resolver.dns.DnsNameResolverContext.query(DnsNameResolverContext.java:306) at io.netty.resolver.dns.DnsNameResolverContext.query(DnsNameResolverContext.java:295) at io.netty.resolver.dns.DnsNameResolverContext.access$700(DnsNameResolverContext.java:60) at io.netty.resolver.dns.DnsNameResolverContext$3.operationComplete(DnsNameResolverContext.java:339) at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:507) at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:481) at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:420) at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:122) at io.netty.resolver.dns.DnsQueryContext.setFailure(DnsQueryContext.java:223) at io.netty.resolver.dns.DnsQueryContext.access$300(DnsQueryContext.java:42) at io.netty.resolver.dns.DnsQueryContext$4.run(DnsQueryContext.java:162) at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38) at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:125) at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:745) Caused by: io.netty.resolver.dns.DnsNameResolverTimeoutException: [/8.8.4.4:53] query timed out after 5000 milliseconds (no stack trace available)

mrniko · 2018-09-25T10:54:28Z

@normanmaurer

Could this error redisson/redisson#1646 related to this issue either?

normanmaurer · 2018-09-25T11:06:42Z

@johnjaylward @utsavchanda any more details ?

johnjaylward · 2018-09-25T14:15:39Z

I don't at this time. I was mainly looking at upgrading the libraries as part of a larger task and have since put down the upgrade due to this issue and moved onto the rest of the task. I'm not sure when I'll have time to investigate it further.

normanmaurer · 2018-09-25T17:58:05Z

Sorry but without more infos I suspect I will not be able to help :(

normanmaurer · 2019-01-18T13:30:04Z

@johnjaylward @mrniko after re-reading the RFC closely and inspecting our code again I think I found the bug. Can you please check if #8731 works for you ?

Also thanks to @Lukasa to discuss this with me :)

normanmaurer · 2019-01-18T13:38:11Z

@mrniko also can you test removing .resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY); ?

mrniko · 2019-01-18T13:40:28Z

@normanmaurer

Issue came back if I comment out this code .resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY);

normanmaurer · 2019-01-18T13:42:15Z

@mrniko ok cool... With #8731 the problem is gone also when .resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY) is NOT used (at least for me). Can you try it out ?

mrniko · 2019-01-18T13:45:28Z

@normanmaurer
Everything works fine with group object:

DnsAddressResolverGroup group = new DnsAddressResolverGroup(new DnsNameResolverBuilder()
                .channelType(NioDatagramChannel.class)
                .nameServerProvider(DnsServerAddressStreamProviders.platformDefault())
                .resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY));

and doesn't work if group object is follow:

DnsAddressResolverGroup group = new DnsAddressResolverGroup(new DnsNameResolverBuilder()
                .channelType(NioDatagramChannel.class)
                .nameServerProvider(DnsServerAddressStreamProviders.platformDefault()));

mrniko · 2019-01-18T13:46:16Z

@normanmaurer
Do you have netty-all.jar for the latest version?

normanmaurer · 2019-01-18T13:47:05Z

@mrniko let me build one for you with the pr included... one sec

normanmaurer · 2019-01-18T13:52:46Z

@mrniko https://drive.google.com/open?id=11pNwvCkl3ECB3CpjlUzDnuG0m3Td27yg please try with this jar and report back.

mrniko · 2019-01-18T13:53:49Z

@normanmaurer

This page by this link reports 404

normanmaurer · 2019-01-18T13:54:23Z

@mrniko just fixed the link... please try again

mrniko · 2019-01-18T13:59:48Z

@normanmaurer

Now it works. Thank you!

normanmaurer · 2019-01-18T14:00:20Z

@mrniko the code or the link, or both ? ;)

mrniko · 2019-01-18T14:00:50Z

@normanmaurer

Both :)

normanmaurer · 2019-01-18T14:01:10Z

Yeah :) ... Please note in the PR as well...

…other nameservers are left. (#8731) Motivation: When using multiple nameservers and a nameserver respond with NXDOMAIN we should only fail the query if the nameserver in question is authoritive or no nameservers are left to try. Modifications: - Try next nameserver if NXDOMAIN was returned but the nameserver is not authoritive - Adjust testcase to respect correct behaviour. Result: Fixes #8261

hlms · 2019-01-23T05:26:22Z

@normanmaurer ,
Thanks for fixing this.

We attempted to workaround this by setting dnsMonitoringInterval to -1.
config.useSingleServer().setDnsMonitoringInterval(-1);
and surprisingly, it seems to work.

However, JAVA_HOME\jre\lib\security\java.security had the following parameters:

# caching forever
networkaddress.cache.ttl=-1  

# 10 seconds.
networkaddress.cache.negative.ttl=10

Do you think it is a legitimate workaround?

Also posted the question in another issue: redisson/redisson#1486 (comment)

normanmaurer · 2019-01-23T07:00:46Z

@hlms I have no idea how exactly redission uses it so you will need to ask there.

This version contains the fix for the DNS Resolution bug found in netty. netty/netty#8261

BenyahyaF45 · 2020-12-19T20:21:01Z

Any Help Plz!

Sigty · 2021-01-11T20:56:10Z

Add this propertie for your custom services:

eureka.instance.prefer-ip-address=true

2. add global http proxy configuration and set proxy in http client

johnjaylward mentioned this issue Sep 6, 2018

Regression: DNS resolver failing to find valid DNS record redisson/redisson#1625

Closed

johnjaylward closed this as completed Sep 6, 2018

johnjaylward reopened this Sep 10, 2018

johnjaylward changed the title ~~Regression: DNS resolver failing to find valid DNS record~~ DNS resolver failing to find valid DNS record Sep 10, 2018

mrniko mentioned this issue Sep 25, 2018

DNSNameResolver warnings in log using AWS Elasticache redisson/redisson#1646

Closed

mrniko mentioned this issue Oct 4, 2018

Occasional ERROR:Search domain query failed. redisson/redisson#1486

Closed

normanmaurer mentioned this issue Jan 18, 2019

Only handle NXDOMAIN as failure when nameserver is authoritive or no … #8731

Merged

normanmaurer added this to the 4.1.33.Final milestone Jan 18, 2019

normanmaurer added the defect label Jan 18, 2019

normanmaurer closed this as completed in #8731 Jan 18, 2019

m1schka mentioned this issue Feb 22, 2019

DNS Issue on Kubernetes (ndots=5 + search domain query) #8880

Closed

stsatlantis added a commit to stsatlantis/algoliasearch-client-scala that referenced this issue Apr 4, 2019

Update asyncHttpClientVersion from 2.6.0 to 2.8.1

58587fb

This version contains the fix for the DNS Resolution bug found in netty. netty/netty#8261

stsatlantis mentioned this issue Apr 4, 2019

Update asyncHttpClientVersion from 2.6.0 to 2.8.1 algolia/algoliasearch-client-scala#517

Closed

andxu added a commit to microsoft/azure-maven-plugins that referenced this issue Apr 18, 2021

1. fix dns problem in nett: netty/netty#8261

d34034a

2. add global http proxy configuration and set proxy in http client

andxu added a commit to microsoft/azure-maven-plugins that referenced this issue Apr 18, 2021

1. fix dns problem in nett: netty/netty#8261

cbc1b5b

2. add global http proxy configuration and set proxy in http client

andxu added a commit to microsoft/azure-maven-plugins that referenced this issue Apr 18, 2021

1. fix dns problem in nett: netty/netty#8261

8c57e87

2. add global http proxy configuration and set proxy in http client

DNS resolver failing to find valid DNS record #8261

DNS resolver failing to find valid DNS record #8261

Comments

johnjaylward commented Sep 4, 2018 • edited Loading

Expected behavior

Actual behavior

Steps to reproduce

Minimal yet complete reproducer code (or URL to code)

Netty version

JVM version (e.g. java -version)

OS version (e.g. uname -a)

normanmaurer commented Sep 4, 2018

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hlms commented Jan 23, 2019

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Sigty commented Jan 11, 2021

johnjaylward commented Sep 4, 2018 •

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JVM version (e.g. `java -version`)

OS version (e.g. `uname -a`)

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