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https://issues.apache.org/jira/browse/SSHD-902?focusedWorklogId=229560&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-229560
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ASF GitHub Bot logged work on SSHD-902:
---------------------------------------
Author: ASF GitHub Bot
Created on: 18/Apr/19 04:50
Start Date: 18/Apr/19 04:50
Worklog Time Spent: 10m
Work Description: cegganesh84 commented on issue #100: SSHD-902 Shutdown
output when receiving SSH_MSG_CHANNEL_EOF
URL: https://github.com/apache/mina-sshd/pull/100#issuecomment-484354887
Hi,
We are seeing issues in our port forwarding where the EOF messages or not
handled properly. Will this pull request be merged sooner, so that we can try
it out in the development environment.
Thanks,
Ganesh
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Issue Time Tracking
-------------------
Worklog Id: (was: 229560)
Time Spent: 20m (was: 10m)
> Local port forwarding: EOF is not handled properly
> --------------------------------------------------
>
> Key: SSHD-902
> URL: https://issues.apache.org/jira/browse/SSHD-902
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.1.0
> Environment: OS: both Windows 10 and Red Hat Enterprise Linux Server
> release 7.4 (Maipo) Linux 4.1.12-124.19.2.el7uek.x86_64 x86_64
> JDK: 1.8.0_201
> SSHD: 2.1.0
> Reporter: Yumin Sang
> Priority: Critical
> Attachments: AbstractServerCloseTestSupport.java,
> ApacheServerApacheClientTest.java, fixBasedOn2.1.0.zip, packets.PNG
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Set remote port to a real listening port but is not for DB connection. Start
> a local port forwarding. Try getting a connection through the established SSH
> tunnel. This operation is expected to be finished with some error, but it
> hangs.
> Reproduce steps:
> # prepare a Linux server and find a listening port, such as 2049, which is
> not of DB listener.
> # get attached demo code: ApacheServerApacheClientTest.java and
> AbstractServerCloseTestSupport.java. They are modified from the ones in
> mina-sshd-2.1.0\sshd-core\src\test\java\org\apache\sshd\common\forward.
> Please replace the corresponding ones.
> # download ojdbc8.jar from
> [https://www.oracle.com/technetwork/database/features/jdbc/jdbc-ucp-122-3110062.html?|https://www.oracle.com/technetwork/database/features/jdbc/jdbc-ucp-122-3110062.html]
> and add it to classpath.
> # set up a local port forwarding tunnel by Putty or other tools. Set the
> forwarded local port to 37777, remote server/port to the server/port in step
> 1.
> # run ApacheServerApacheClientTest.java. It finishes with error like
> java.io.IOException: Got minus one from a read call. This is expected
> behavior.
> # change
> org.apache.sshd.common.forward.AbstractServerCloseTestSupport#testLocalPortForwardOneBuffer:
> uncomment line "int serverPort = startLocalPF();" and comment line "int
> serverPort = 37777;"
> # change
> org.apache.sshd.common.forward.ApacheServerApacheClientTest#createClient, set
> username, host and password to the ones in step 1.
> # run ApacheServerApacheClientTest.java again and it hangs.
> By capturing loopback packets, it can be found the interactions are same, but
> SSHD make different process from what Putty does. In attached snapshot, the
> "nfs" is of port 2049.
> Did a bit digging up, and it seems that EOF is not handled properly. Here is
> a call stack:
> handleEof:873, AbstractChannel (org.apache.sshd.common.channel)
> channelEof:498, AbstractConnectionService
> (org.apache.sshd.common.session.helpers)
> process:357, AbstractConnectionService
> (org.apache.sshd.common.session.helpers)
> doHandleMessage:626, AbstractSession (org.apache.sshd.common.session.helpers)
> handleMessage:559, AbstractSession (org.apache.sshd.common.session.helpers)
> decode:1542, AbstractSession (org.apache.sshd.common.session.helpers)
> messageReceived:520, AbstractSession (org.apache.sshd.common.session.helpers)
> messageReceived:63, AbstractSessionIoHandler
> (org.apache.sshd.common.session.helpers)
> handleReadCycleCompletion:339, Nio2Session (org.apache.sshd.common.io.nio2)
> onCompleted:318, Nio2Session$1 (org.apache.sshd.common.io.nio2)
> onCompleted:315, Nio2Session$1 (org.apache.sshd.common.io.nio2)
> lambda$completed$0:38, Nio2CompletionHandler (org.apache.sshd.common.io.nio2)
> run:-1, 391147216
> (org.apache.sshd.common.io.nio2.Nio2CompletionHandler$$Lambda$73)
> doPrivileged:-1, AccessController (java.security)
> completed:37, Nio2CompletionHandler (org.apache.sshd.common.io.nio2)
> invokeUnchecked:126, Invoker (sun.nio.ch)
> run:218, Invoker$2 (sun.nio.ch)
> run:112, AsynchronousChannelGroupImpl$1 (sun.nio.ch)
> runWorker:1149, ThreadPoolExecutor (java.util.concurrent)
> run:624, ThreadPoolExecutor$Worker (java.util.concurrent)
> run:748, Thread (java.lang)
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