coderZoe opened a new issue, #482:
URL: https://github.com/apache/mina-sshd/issues/482
### Version
group: 'org.apache.sshd',name: 'sshd-core',version: '2.12.0'
### Bug description
After my SSH client receives the message
`o.a.sshd.client.channel.ChannelShell -
handleUnknownChannelRequest(ChannelShell[id=0,
recipient=0]-ClientSessionImpl[admin@/10.252.146.106:61122]) Unknown channel
request: keepal...@openssh.com[want-reply=true]`, it immediately disconnects
from the server (it is possible that the server is the one terminating the
connection).
However, I have already set `KeepAliveHandler.INSTANCE` in the
`GlobalRequestHandlers` when creating the client. Debugging the code shows that
it does not enter the `KeepAliveHandler#process()` method, which seems to
indicate that the setting of `GlobalRequestHandlers` has no effect.
### Actual behavior
After my SSH client receives the message
`o.a.sshd.client.channel.ChannelShell -
handleUnknownChannelRequest(ChannelShell[id=0,
recipient=0]-ClientSessionImpl[admin@/10.252.146.106:61122]) Unknown channel
request: keepal...@openssh.com[want-reply=true]`, it immediately disconnects
from the server (it is possible that the server is the one terminating the
connection).
### Expected behavior
Why is this happening? Is it because the server sent a keepalive packet and
I did not respond, causing the server to terminate the connection? I do not
wish to disconnect and reconnect every so often; I want to maintain a long
connection. If it is due to not responding to the server's keepalive packets,
what should I do to keep the connection alive at all times?
### Relevant log output
```Shell
here is the log:
[WARN ] 10:16:53.178 [sshd-SshClient[72dd8b0]-nio2-thread-1] [ ]
o.a.sshd.client.channel.ChannelShell -
handleUnknownChannelRequest(ChannelShell[id=0,
recipient=0]-ClientSessionImpl[admin@/10.252.146.106:61122]) Unknown channel
request: keepal...@openssh.com[want-reply=true]
```log
org.apache.sshd.common.SshException:
IoReadFutureImpl[ChannelAsyncInputStream[ChannelShell[id=0,
recipient=0]-ClientSessionImpl[admin@/10.252.146.106:61122]]]: Failed
(EOFException) to execute: Closed
at
org.apache.sshd.common.future.AbstractSshFuture.lambda$verifyResult$2(AbstractSshFuture.java:146)
at
org.apache.sshd.common.future.AbstractSshFuture.formatExceptionMessage(AbstractSshFuture.java:206)
at
org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:145)
at
org.apache.sshd.common.channel.ChannelAsyncInputStream$IoReadFutureImpl.verify(ChannelAsyncInputStream.java:173)
at
org.apache.sshd.common.channel.ChannelAsyncInputStream$IoReadFutureImpl.verify(ChannelAsyncInputStream.java:156)
at
org.apache.sshd.common.future.VerifiableFuture.verify(VerifiableFuture.java:74)
at
com.uca.network.v2.communication.core.sender.session.BaseSshSessionSender$ChannelResponseListener.operationComplete(BaseSshSessionSender.java:290)
at
com.uca.network.v2.communication.core.sender.session.BaseSshSessionSender$ChannelResponseListener.operationComplete(BaseSshSessionSender.java:268)
at
org.apache.sshd.common.future.AbstractSshFuture.lambda$notifyListener$3(AbstractSshFuture.java:178)
at
org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:64)
at
org.apache.sshd.common.future.AbstractSshFuture.notifyListener(AbstractSshFuture.java:177)
at
org.apache.sshd.common.future.DefaultSshFuture.notifyListeners(DefaultSshFuture.java:257)
at
org.apache.sshd.common.future.DefaultSshFuture.setValue(DefaultSshFuture.java:160)
at
org.apache.sshd.common.channel.ChannelAsyncInputStream.preClose(ChannelAsyncInputStream.java:98)
at
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:109)
at
org.apache.sshd.common.util.closeable.ParallelCloseable.doClose(ParallelCloseable.java:65)
at
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:56)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
at
org.apache.sshd.common.future.AbstractSshFuture.lambda$notifyListener$3(AbstractSshFuture.java:178)
at
org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:64)
at
org.apache.sshd.common.future.AbstractSshFuture.notifyListener(AbstractSshFuture.java:177)
at
org.apache.sshd.common.future.DefaultSshFuture.addListener(DefaultSshFuture.java:214)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:57)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
at
org.apache.sshd.common.future.AbstractSshFuture.lambda$notifyListener$3(AbstractSshFuture.java:178)
at
org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:64)
at
org.apache.sshd.common.future.AbstractSshFuture.notifyListener(AbstractSshFuture.java:177)
at
org.apache.sshd.common.future.DefaultSshFuture.addListener(DefaultSshFuture.java:214)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:57)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
at
org.apache.sshd.common.util.closeable.SequentialCloseable.doClose(SequentialCloseable.java:69)
at
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:56)
at
org.apache.sshd.common.util.closeable.SequentialCloseable$1.operationComplete(SequentialCloseable.java:45)
at
org.apache.sshd.common.util.closeable.SequentialCloseable.doClose(SequentialCloseable.java:69)
at
org.apache.sshd.common.util.closeable.SimpleCloseable.close(SimpleCloseable.java:63)
at
org.apache.sshd.common.util.closeable.AbstractInnerCloseable.doCloseGracefully(AbstractInnerCloseable.java:41)
at
org.apache.sshd.common.util.closeable.AbstractCloseable.close(AbstractCloseable.java:110)
at
org.apache.sshd.common.channel.AbstractChannel.handleClose(AbstractChannel.java:578)
at
org.apache.sshd.common.session.helpers.AbstractConnectionService.channelClose(AbstractConnectionService.java:644)
at
org.apache.sshd.common.session.helpers.AbstractConnectionService.process(AbstractConnectionService.java:483)
at
org.apache.sshd.common.session.helpers.CurrentService.process(CurrentService.java:109)
at
org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:624)
at
org.apache.sshd.common.session.helpers.AbstractSession.lambda$handleMessage$0(AbstractSession.java:545)
at
org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:68)
at
org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:544)
at
org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1688)
at
org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:505)
at
org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:64)
at
org.apache.sshd.common.io.nio2.Nio2Session.handleReadCycleCompletion(Nio2Session.java:409)
at
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:382)
at
org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:377)
at
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.lambda$completed$0(Nio2CompletionHandler.java:38)
at java.security.AccessController.doPrivileged(Native Method)
at
org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:37)
at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)
at sun.nio.ch.Invoker$2.run(Invoker.java:218)
at
sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
Caused by: java.io.EOFException: Closed
... 49 common frames omitted
```
Here is the code I used to set up the client:
```java
this.client = SshClient.setUpDefaultClient();
this.client.start();
this.client.setGlobalRequestHandlers(Arrays.asList(KeepAliveHandler.INSTANCE,
NoMoreSessionsHandler.INSTANCE));
ConnectFuture connectFuture = client.connect(metaData.getUserName(),
metaData.getIp(), metaData.getPort())
.verify(metaData.getConnectTimeout());
if (connectFuture.isConnected()) {
this.session = connectFuture.getSession();
} else {
throw new ConnectException(connectFuture.getException().getMessage());
}
this.session.addPasswordIdentity(metaData.getPassword());
AuthFuture authFuture =
this.session.auth().verify(metaData.getAuthTimeout());
if (authFuture.isSuccess()) {
this.status = SenderStatus.CONNECTING;
} else {
throw new AuthException("Auth Fail:" +
authFuture.getException().getMessage());
}
this.channel = createChannel();
```
```java
public ClientChannel createChannel() throws Exception {
ClientChannel channel =
this.session.createChannel(ClientChannel.CHANNEL_SHELL);
channel.setStreaming(ClientChannel.Streaming.Async);
channel.open().verify();
channel.getAsyncOut().read(new
ByteArrayBuffer(BUFFER_PIPE_SIZE)).addListener(new
ChannelResponseListener(this));
return channel;
}
```
```
### Other information
_No response_
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