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https://issues.apache.org/jira/browse/SSHD-902?focusedWorklogId=252817&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-252817
]
ASF GitHub Bot logged work on SSHD-902:
---------------------------------------
Author: ASF GitHub Bot
Created on: 02/Jun/19 08:46
Start Date: 02/Jun/19 08:46
Worklog Time Spent: 10m
Work Description: lgoldstein commented on pull request #100: SSHD-902
Shutdown output when receiving SSH_MSG_CHANNEL_EOF
URL: https://github.com/apache/mina-sshd/pull/100
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Issue Time Tracking
-------------------
Worklog Id: (was: 252817)
Time Spent: 50m (was: 40m)
> 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
> Assignee: Goldstein Lyor
> Priority: Critical
> Fix For: 2.0.3
>
> Attachments: AbstractServerCloseTestSupport.java,
> ApacheServerApacheClientTest.java, fixBasedOn2.1.0.zip, packets.PNG
>
> Time Spent: 50m
> 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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