Motivation:
DefaultHostsFileEntriesResolver should provide all hosts file's entries for a hostname when
DnsNameResolver#resolveAll as opposed to the current implementation where only the first
entry is taken into consideration
Modification:
- Add DefaultHostsFileEntriesResolver#addresses to provide all hosts file's entries for a hostname
- Add HostsFileEntriesProvider to provide all hosts file's entries for a hostname and to keep
backwards compatibility for HostsFileEntries and HostsFileParser
- DnsNameResolver#resolveAll uses the new DefaultHostsFileEntriesResolver#addresses
- BlockHound configuration: replace HostsFileParser#parse with HostsFileEntriesProvider$ParserImpl#parse
as the latter does the parsing
- Add junit tests
Result:
Fixes#10834
* Address feedback
Motivation:
DNS resolver falls back to trying CNAME if no records found, but should
only try this for A/AAAA queries. Does not make sense for other query
types, results in a redundant CNAME query that is just going to fail.
Modification:
Check query type before deciding to try CNAME. Only proceed if type is A
or AAAA.
Added unit test to verify CNAME is only tried after A/AAAA queries.
Result:
Fixes#11214.
Motivation:
NullChecks resulting in a NullPointerException or IllegalArgumentException, numeric ranges (>0, >=0) checks, not empty strings/arrays checks must never be anonymous but with the parameter or variable name which is checked. They must be specific and should not be done with an "OR-Logic" (if a == null || b == null) throw new NullPointerEx.
Modifications:
* import static relevant checks
* Replace manual checks with ObjectUtil methods
Result:
All checks needed are done with ObjectUtil, some exception texts are improved in microbench and resolver-dns
Fixes#11170
Motivation:
On Windows DnsNameResolver is not able to resolve the host(computer) name as it is not in the hosts file and the DNS server is also not able to resolve it.
The exception below is the result of the resolution:
Caused by: java.net.UnknownHostException: failed to resolve 'host(computer)-name' after 2 queries
at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013)
at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:966)
at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:414)
at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:938)
at io.netty.resolver.dns.DnsResolveContext.access$700(DnsResolveContext.java:63)
at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:467)
Modifications:
On Windows DnsNameResolver maps host(computer) name to LOCALHOST
Result:
DnsNameResolver is able to resolve the host(computer) name on Windows
Fixes#11142
Motivation:
The DnsResolver default start address listen to "0.0.0.0", which may be not what the user wants.
Modification:
Add localAddress as a param of DnsNameResolver and its builder
Result:
The DnsNameResolver's bind address can be configured.
Motivation:
It is not uncommon to run Netty on OS X without the specific
`MacOSDnsServerAddressStreamProvider`. The current log message is too
verbose because it prints a full stack trace on the console while a
simple logging message would have been enough.
Modifications:
- Print a `WARN` message when `MacOSDnsServerAddressStreamProvider`
class is not found;
- Print a `ERROR` message with a stack trace when the class was found
but could not be loaded due to some other reasons;
Result:
Less noise in logs.
Motivation:
When etcResolver/hosts files are parsed, FileInputStream.read(...) is internally called by
- UnixResolverDnsServerAddressStreamProvider#parseEtcResolverSearchDomains
- UnixResolverDnsServerAddressStreamProvider#parseEtcResolverOptions
- HostsFileParser#parse
This will cause the error below when BlockHound is enabled
reactor.blockhound.BlockingOperationError: Blocking call! java.io.FileInputStream#readBytes
at java.io.FileInputStream.readBytes(FileInputStream.java)
at java.io.FileInputStream.read(FileInputStream.java:255)
Modifications:
- Add whitelist entries to BlockHound configuration
- Fix typos in UnixResolverDnsServerAddressStreamProvider
- Add tests
Result:
Fixes#11004
Motivation:
`DnsServerAddressStreamProviders` tries to load `MacOSDnsServerAddressStreamProvider`
on macOS. However, it doesn't warn users when `MacOSDnsServerAddressStreamProvider`
is not awailable, which may cause incorrect results for DNS resolutions.
Modifications:
- Log at warn level if `MacOSDnsServerAddressStreamProvider` is not found on macOS;
- Log at debug level when `MacOSDnsServerAddressStreamProvider` is loaded and available;
Result:
macOS users are notified when `MacOSDnsServerAddressStreamProvider` is not available.
Motivation:
The DnsNameResolver internally follows CNAME indirects for all records types, and supports caching for CNAME resolution and A* records. For DNS record types that are not cached (e.g. SRV records) the caching of CNAME records may result in failures at incorrect times. For example if a CNAME record has a larger TTL than the entries it resolves this may result in failures which don't occur if the CNAME cache is disabled.
Modifications:
- Don't cache CNAME and also dont use the cache for CNAME when using DnsRecordResolveContext
- Add unit test
Result:
More correct resolving and also not possible to have failures due CNAME still be in the cache while the queried record experied
Motivation:
https in xmlns URIs does not work and will let the maven release plugin fail:
```
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.779 s
[INFO] Finished at: 2020-11-10T07:45:21Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.5.3:prepare (default-cli) on project netty-parent: Execution default-cli of goal org.apache.maven.plugins:maven-release-plugin:2.5.3:prepare failed: The namespace xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" could not be added as a namespace to "project": The namespace prefix "xsi" collides with an additional namespace declared by the element -> [Help 1]
[ERROR]
```
See also https://issues.apache.org/jira/browse/HBASE-24014.
Modifications:
Use http for xmlns
Result:
Be able to use maven release plugin
Motivation:
Since GraalVM version 19.3.0, instances of java.net.InetAddress (and its subclasses Inet4Address and Inet6Address) are not allowed in native image heap (that is, they cannot be stored in static fields of classes initialized at build time or be reachable through static fields of such classes). When building a native image, it makes sense to initialize at build time as many classes as possible.
But some fields of some classes in Netty (for example, NetUtil.LOCALHOST4) contain InetAddress instances. If a program is using code path that makes it possible to reach such fields at build time initialization, it becomes impossible to build a native image initializing core Netty classes initialized at runtime. An example of such a program is a client that uses netty-dns.
Modifications:
- Add netty-testsuite-native-image-client Maven module to test that such an example program can be built after the corresponding fixes
- Add native-image.properties to resolver-dns module to move initialization of some classes to runtime (some of them are parsing configuration during initialization, so it makes no sense to initialize them at build time; for others, it's needed to avoid InetAddress reachability at build time)
- Add substitutions for NetUtil.LOCALHOST4, NetUtil.LOCALHOST6 and NetUtil.LOCALHOST to overcome the InetAddress-related prohibition
- Extract some initialization code from NetUtil to NetUtilInitializations to allow it to be used by the substitutions
Result:
A client program using netty-dns with --initialize-at-build-time=io.netty builds successfully
Motivation:
HTTP is a plaintext protocol which means that someone may be able
to eavesdrop the data. To prevent this, HTTPS should be used whenever
possible. However, maintaining using https:// in all URLs may be
difficult. The nohttp tool can help here. The tool scans all the files
in a repository and reports where http:// is used.
Modifications:
- Added nohttp (via checkstyle) into the build process.
- Suppressed findings for the websites
that don't support HTTPS or that are not reachable
Result:
- Prevent using HTTP in the future.
- Encourage users to use HTTPS when they follow the links they found in
the code.
Motivation:
junit deprecated Assert.assertThat(...)
Modifications:
Use MatcherAssert.assertThat(...) as replacement for deprecated method
Result:
Less deprecation warnings
Motivation:
LGTM reports multiple issues. They need to be triaged,
and real ones should be fixed.
Modifications:
- Fixed multiple issues reported by LGTM, such as redundant conditions,
resource leaks, typos, possible integer overflows.
- Suppressed false-positives.
- Added a few testcases.
Result:
Fixed several possible issues, get rid of false alarms in the LGTM report.
Motivation:
We have a few classes in which we store and reuse static instances of various exceptions. When doing so it is important to also override fillInStacktrace() and so prevent the leak of the ClassLoader in the internal backtrace field.
Modifications:
- Add overrides of fillInStracktrace when needed
- Move ThrowableUtil usage in the static methods
Result:
Fixes https://github.com/netty/netty/pull/10686
Motivation:
Due a change introduced in 68105b257d we incorrectly skipped the usage of nameservers in some cases.
Modifications:
Only fetch a new stream of nameserver if the hostname not matches the original hostname in the query.
Result:
Use all configured nameservers. Fixes https://github.com/netty/netty/issues/10499
Expose a LoggingDnsQueryLifeCycleObserverFactory
Motivation:
There is a use case for having logging in the DnsNameResolver, similar to the LoggingHandler.
Previously, one could set `traceEnabled` on the DnsNameResolverBuilder, but this is not very configurable.
Specifically, the log level and the logger context cannot be changed.
Modification:
Expose a LoggingDnsQueryLifeCycleObserverFactory, that permit changing the log-level
and logger context.
Result:
It is now possible to get logging in the DnsNameResolver at a custom log level and logger,
without very much effort.
Fixes#10485
