Motivation:
The MacOS-specific `connectx(2)` system call make it possible to establish client-side connections with TCP FastOpen.
Modification:
Add support for TCP FastOpen to the KQueue transport, and add the `connectx(2)` system call to `BsdSocket`.
Result:
It's now possible to use TCP FastOpen when initiating connections on MacOS.
Motivation:
Let's have fewer warnings about broken, missing, or abuse of javadoc comments.
Modification:
Added descriptions to throws clauses that were missing them.
Remove link clauses from throws clauses - these are implied.
Turned some javadoc comments into block comments because they were not applied to APIs.
Use code clauses instead of code tags.
Result:
Fewer javadoc crimes.
Motivation:
There are lots of imports which are unused. We should get rid of them to make the code look better,
Modification:
Removed unused imports.
Result:
No unused imports.
Motivation:
There are use cases when Unix domain datagram sockets are needed for communication.
This PR adds such support for Epoll/KQueue.
Modification:
- Expose Channel, Config and Packet interfaces/classes for Unix domain datagram sockets.
All interfaces/classes are in `transport-native-unix-common` module in order to be available
for KQueue and Epoll implementations
- Add JNI code for Unix domain datagram sockets
- Refactor `DatagramUnicastTest` so that it can be used for testing also Unix domain datagram sockets
- Add Unix domain datagram sockets implementation for KQueue transport
- Add Unix domain datagram sockets implementation for Epoll transport
Result:
Fixes#6737
Motivation:
JUnit 5 is more expressive, extensible, and composable in many ways, and it's better able to run tests in parallel.
Modifications:
Use JUnit5 in tests
Result:
Related to https://github.com/netty/netty/issues/10757
Motivation:
It turns out it is quite easy to cause a classloader deadlock in more recent java updates if you cause classloading while you are in native code. Because of this we should just workaround this issue by pre-load all the classes that needs to be accessed in the OnLoad function.
Modifications:
- Preload all classes that would otherwise be loaded by native OnLoad functions.
Result:
Workaround for https://github.com/netty/netty/issues/11209 and https://bugs.openjdk.java.net/browse/JDK-8266310
Motivation:
While adding support for GRO (b05fdf3ff8) we broke support for IP_RECVORIGDSTADDR when using the native transport. Beside this we also didnt correctly handle IP_RECVORIGDSTADDR when recvmmsg was used.
Modifications:
- Fix support for IP_RECVORIGDSTADDR when using the native epoll transport for normal reads (recvmsg) but also for scattering reads (recvmmsg)
- Remove code from unix code-base as the support is linux specific and we not need the code there anymore
Result:
Fixes https://github.com/netty/netty/issues/11141
Motivation:
As we can supported SegmentedDatagramPacket in multiple native
transports (like in epoll and io_uring) we should just move it to
unix-common so we can share code.
Modification:
- Move SegmentedDatagrampPacket to transport-native-unixu
- Mark the SegmentedDatagramPacket in epoll as deprecated
- Update code to use updated package.
Result:
Possibility of code re-use
Motivation:
SslHandler owns the responsibility to flush non-application data
(e.g. handshake, renegotiation, etc.) to the socket. However when
TCP Fast Open is supported but the client_hello cannot be written
in the SYN the client_hello may not always be flushed. SslHandler
may not wrap/flush previously written/flushed data in the event
it was not able to be wrapped due to NEED_UNWRAP state being
encountered in wrap (e.g. peer initiated renegotiation).
Modifications:
- SslHandler to flush in channelActive() if TFO is enabled and
the client_hello cannot be written in the SYN.
- SslHandler to wrap application data after non-application data
wrap and handshake status is FINISHED.
- SocketSslEchoTest only flushes when writes are done, and waits
for the handshake to complete before writing.
Result:
SslHandler flushes handshake data for TFO, and previously flushed
application data after peer initiated renegotiation finishes.
Motivation:
To make it possible to experiment with alternative buffer implementations, we need a way to abstract away the concrete buffers used throughout most of the Netty pipelines, while still having a common currency for doing IO in the end.
Modification:
- Introduce an ByteBufConvertible interface, that allow arbitrary objects to convert themselves into ByteBuf objects.
- Every place in the code, where we did an instanceof check for ByteBuf, we now do an instanceof check for ByteBufConvertible.
- ByteBuf itself implements ByteBufConvertible, and returns itself from the asByteBuf method.
Result:
It is now possible to use Netty with alternative buffer implementations, as long as they can be converted to ByteBuf.
This has been verified elsewhere, with an alternative buffer implementation.
Support TCP Fast Open for clients and make SslHandler take advantage
Motivation:
- TCP Fast Open allow us to send a small amount of data along side the initial SYN packet when establishing a TCP connection.
- The TLS Client Hello packet is small enough to fit in there, and is also idempotent (another requirement for using TCP Fast Open), so if we can save a round-trip when establishing TLS connections when using TFO.
Modification:
- Add support for client-side TCP Fast Open for Epoll, and also lowers the Linux kernel version requirements to 3.6.
- When adding the SslHandler to a pipeline, if TCP Fast Open is enabled for the channel (and the channel is not already active) then start the handshake early by writing it to the outbound buffer.
- An important detail to note here, is that the outbound buffer is not flushed at this point, like it would for normal handshakes. The flushing happens later as part of establishing the TCP connection.
Result:
- It is now possible for clients (on epoll) to open connections with TCP Fast Open.
- The SslHandler automatically detects when this is the case, and now send its Client Hello message as part of the initial data in the TCP Fast Open flow when available, saving a round-trip when establishing TLS connections.
Co-authored-by: Colin Godsey <crgodsey@gmail.com>
Motiviation:
We need to ensure we only register the methods for unix-native-common once as otherwise it may have strange side-effects.
Modifications:
- Add extra method that should be called to signal that we need to register the methods. The registration will only happen once.
- Adjust code to make use of it.
Result:
No more problems due incorrect registration of these methods.
Motivation:
https://github.com/netty/netty/pull/10814 did fix a bug where we did try to call memoryAddress() even tho this is not supported. Unfortunally this fix was only applied for one method and so we missed another method which then could throw an exception when we called memoryAddress()
Modifications:
- Also fix the memoryAddress(offset) method.
_ Adjust unit test to also test this.
Result:
Fixes https://github.com/netty/netty/issues/10813 completely.
Motivation:
In some enviroments sun.misc.Unsafe is not present. We should support these as well.
Modifications:
Fallback to JNI if we can't directly access the memoryAddress of the buffer.
Result:
Fixes https://github.com/netty/netty/issues/10813
Motivation:
We had a lot of duplication in our jni code which was mostly due macros but also related to how we support shading. By using netty-jni-util we can share all the code between netty and netty-tcnative ( and possible other jni based netty projects in the future).
Modifications:
- Use netty-jni-util and re-use its macros / functions
- Remove duplicated code
- Adjust build files
Result:
Less code duplication for JNI
Motivation:
ddebc1027d missed to make Errors.throwConnectException(...) public
Modifications:
Make method public
Result:
Be able to use Errors.throwConnectException(...) from other module
Motivation:
During the last few month we did develop an io_uring based transport which shows very promising performance numbers. To give it more time to bake we will develop it outside of netty in an "incubator" module which will make it clear to users what to expect and also allow us to seperate its release cycle. While the implementation of it is very self contained there are few small adjustments that need to be made in netty itself to allow us to reuse code.
Modifications:
- AbstractChannel: Add method which can be used when a write fails and remove final from one method
- IovArray: Allow to create an IovArray from a ByteBuf instance
- FileDescriptor: Allow to reuse mark close logic via sub-class
Result:
Be able to reuse netty core classes in io_uring incubator repository
Motivation:
It's important to unload all previous registered native methods when there is a failure during loading the native lib. Failing to do so may lead to an "invalid state" and so may segfault the JVM when trying to call a native method that was previous loaded.
This was observed when two versions of netty-tcnative were on the classpath which had different requirements in terms of linking.
Something like this was reported in he hs log:
```
Instructions: (pc=0x0000000116413bf0)
0x0000000116413bd0:
[error occurred during error reporting (printing registers, top of stack, instructions near pc), id 0xb]
Register to memory mapping:
RAX=0x0000000116413bf0 is an unknown value
RBX={method} {0x000000011422e708} 'aprMajorVersion' '()I' in 'io/netty/internal/tcnative/Library'
RCX=0x000000000000000a is an unknown value
RDX=0x000000000000000a is an unknown value
```
Modifications:
- Unregister previous registered native methods on failure
- Unregister previous registered native methods on on unload of the native lib
Result:
No more segfault caused by invalid state when loading of the native lib fails in between. In this case the user will receive an error now like:
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:
In some situations we could have end up calling some functions with NULL parameters which in this case could lead to undefined behavior. All of this would have happened during loading of the native lib.
Modifications:
Add NULL check as guards and return early
Result:
Fix some possible undefined behavior
Motivation:
DuplexChannel allow for half-closure, we should have a special config interface for it as well.
Modifications:
Add DuplexChannelConfig which allows to configure half-closure.
Result:
More consistent types
Motivation:
Noticed we had some unused non-public classes.
There is no reason to keep these around.
Modification:
Remove unused non-public classes.
Result:
Less code to worry about.
Motivation:
We previously relied on `strerror`, but this function is unfortunately not thread-safe.
Modification:
The use of `strerror` has been changed to `strerror_r`, which is thread-safe.
This function has a more complicated API, and has portability concerns that needs to be handled.
This accounts for the relatively large increase in lines of code.
Result:
Error messages from JNI are now always generated in a thread-safe way.
Motivation:
Even if the system does not support ipv6 we should try to use it if the user explicit pass an Inet6Address. This way we ensure we fail and not try to convert this to an ipv4 address internally.
This incorrect behavior was introduced by 70731bfa7e
Modifications:
If the user explicit passed an Inet6Address we force the usage of ipv6
Result:
Fixes https://github.com/netty/netty/issues/10402
Motivation:
Modern versions of FreeBSD define IP_RECVORIGDSTADDR, but don't define
SOL_IP. This causes the build to fail.
Modifications:
The equivalent to SOL_IP on FreeBSD is IPPROTO_IP. Define SOL_IP as that
if SOL_IP is not defined and IPPROTO_IP is.
Result:
This allows a successful build on FreeBSD
Motivation:
On MacOS it is not really good enough to check /etc/resolv.conf to determine the nameservers to use. We should retrieve the nameservers using the same way as mDNSResponser and chromium does by doing a JNI call.
Modifications:
Add MacOSDnsServerAddressStreamProvider and testcase
Result:
Use correct nameservers by default on MacOS.
Motivation:
We would like to enable Netty also on a big endian platform such as
s390_64. We need to fix a function which assumes that the target
platform is little endian.
Modifications:
Modify netty_unix_socket_accept() to write an address length as jbyte
instead of jsize.
Result:
Netty can be enabled on a big endian platform.
Signed-off-by: Tatsushi Inagaki <e29253@jp.ibm.com>
Motivation:
aebe206 added support for using a ChannelOption to set / get Buffer sizes but did not add the methods to the DomainSocketChannelConfig interface itself (due not be able to break the API)
Modifications:
Add methods to interface (as this is a next major release)
Result:
Easier access to configure these buffer sizes
Motivation:
At the moment we not consistently (and also not correctly) free allocated native memory in all cases during loading the JNI library. This can lead to native memory leaks in the unlikely case of failure while trying to load the library.
Beside this we also not always correctly handle the case when a new java object can not be created in native code because of out of memory.
Modification:
- Copy some macros from netty-tcnative to be able to handle errors in a more easy fashion
- Correctly account for New* functions to return NULL
- Share code
Result:
More robust and clean JNI code
Motivation:
291f80733a introduced a change to use a byte[] to construct the InetAddress when receiving datagram messages to reduce the overhead. Unfortunally it introduced a regression when handling IPv6-mapped-IPv4 addresses and so produced an IndexOutOfBoundsException when trying to fill the byte[] in native code.
Modifications:
- Correctly use the offset on the pointer of the address.
- Add testcase
- Make tests more robust and include more details when the test fails
Result:
No more IndexOutOfBoundsException
Motivation:
394a1b3485 introduced the possibility to use recvmmsg(...) but did not correctly handle ipv6 mapped ip4 addresses to make it consistent with other transports.
Modifications:
- Correctly handle ipv6 mapped ipv4 addresses by only copy over the relevant bytes
- Small improvement on how to detect ipv6 mapped ipv4 addresses by using memcmp and not byte by byte compare
- Adjust test to cover this bug
Result:
Correctly handle ipv6 mapped ipv4 addresses
Motivation:
When using datagram sockets which need to handle a lot of packets it makes sense to use recvmmsg to be able to read multiple datagram packets with one syscall.
Modifications:
- Add support for recvmmsg on linux
- Add new EpollChannelOption.MAX_DATAGRAM_PACKET_SIZE
- Add tests
Result:
Fixes https://github.com/netty/netty/issues/8446.
Motivation:
At the moment we use the String representation of the IP to create the DatagramSocketAddress. This is not for free and we should better use the byte[] directly to reduce the overhead of parsing the String (and creating it in the first place)
Modifications:
Directly use byte[] as input for the DatagramSocketAddress
Result:
Less overhead when using Datagrams with native transports
Motivation:
Provide epoll/native multicast to support high load multicast users (we are using it for a high load telecomm app at my day job).
Modification:
Added support for source specific and any source multicast for epoll transport. Some caveats: no support for disabling loop back mode, retrieval of interface and block operation, all of which tend to be less frequently used.
Result:
Provides epoll transport multicast for common use cases.
Co-authored-by: Norman Maurer <norman_maurer@apple.com>
Motivation:
OOME is occurred by increasing suppressedExceptions because other libraries call Throwable#addSuppressed. As we have no control over what other libraries do we need to ensure this can not lead to OOME.
Modifications:
Only use static instances of the Exceptions if we can either dissable addSuppressed or we run on java6.
Result:
Not possible to OOME because of addSuppressed. Fixes https://github.com/netty/netty/issues/9151.
Motivation:
When kevent(...) returns with EINTR we do not correctly decrement the timespec
structure contents to account for the time duration. This may lead to negative
values for tv_nsec which will result in an EINVAL and raise an IOException to
the event loop selection loop.
Modifications:
Correctly calculate new timeoutTs when EINTR is detected
Result:
Fixes#9013.
Motivation:
We can just use Objects.requireNonNull(...) as a replacement for ObjectUtil.checkNotNull(....)
Modifications:
- Use Objects.requireNonNull(...)
Result:
Less code to maintain.
Motivation:
We have a utility method to check for > 0 and >0 arguments. We should use it.
Modification:
use checkPositive/checkPositiveOrZero instead of if statement.
Result:
Re-use utility method.
Motivation:
As netty 4.x supported Java 6 we had various if statements to check for java versions < 8. We can remove these now.
Modification:
Remove unnecessary if statements that check for java versions < 8.
Result:
Cleanup code.
Motivation:
We can use the diamond operator these days.
Modification:
Use diamond operator whenever possible.
Result:
More modern code and less boiler-plate.
* Allow to use native transports when sun.misc.Unsafe is not present on the system
Motivation:
We should be able to use the native transports (epoll / kqueue) even when sun.misc.Unsafe is not present on the system. This is especially important as Java11 will be released soon and does not allow access to it by default.
Modifications:
- Correctly disable usage of sun.misc.Unsafe when -PnoUnsafe is used while running the build
- Correctly increment metric when UnpooledDirectByteBuf is allocated. This was uncovered once -PnoUnsafe usage was fixed.
- Implement fallbacks in all our native transport code for when sun.misc.Unsafe is not present.
Result:
Fixes https://github.com/netty/netty/issues/8229.
Motivation:
netty_unix_socket attempts to use nettyClassName in an error message, but previously freed the memory. We should wait to free the memory until after we use it.
Modifications:
- Free nettyClassName after using it in snprintf
Result:
More useful error message.
Motivation:
b818852cdb broke support for shading the native libraries in netty as it missed to respect the package prefix that is used when shading.
Modifications:
Correctly respect package prefix for constructor argument and include the used classname when logging that we could not find the constructor.
Result:
Be able to shade native libraries of netty again.
Motivation:
b818852cdb added support for IP_RECVORIGDSTADDR but did not include any #ifdef statements to ensure its usable at all (which is not the case on MacOS).
Modifications:
Add #ifdef statements to check for IP_RECVORIGDSTADDR.
Result:
Compilation works again on MacOS.
Motivation:
DatagramPacket.recipient() doesn't return the actual destination IP, but the IP the app is bound to.
Modification:
- IP_RECVORIGDSTADDR option is enabled for UDP sockets, which allows retrieval of ancillary information containing the original recipient.
- _recvFrom(...) function from transport-native-unix-common/src/main/c/netty_unix_socket.c is modified such that if IP_RECVORIGDSTADDR is set, recvmsg is used instead of recvfrom; enabling the retrieval of the original recipient.
- DatagramSocketAddress also contains a 'local' address, representing the recipient.
- EpollDatagramChannel is updated to return the retrieved recipient address instead of the address the channel is bound to.
Result:
Fixes#4950.
Motivation:
If close(...) reports EINTR there is nothing sane we can do so it makes no sense to even report it. See also:
https://github.com/apple/swift-nio/pull/217
Modifications:
Just ignore EINTR when calling close(...)
Result:
Less noise in the logs.
