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https://issues.apache.org/jira/browse/SSHD-1257?focusedWorklogId=751401&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-751401
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ASF GitHub Bot logged work on SSHD-1257:
----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Apr/22 05:36
Start Date: 01/Apr/22 05:36
Worklog Time Spent: 10m
Work Description: tomaswolf commented on a change in pull request #214:
URL: https://github.com/apache/mina-sshd/pull/214#discussion_r840247098
##########
File path:
sshd-core/src/main/java/org/apache/sshd/server/channel/ChannelSession.java
##########
@@ -908,7 +908,7 @@ protected void closeShell(int exitValue, boolean
closeImmediately) throws IOExce
if (!isClosing()) {
if (out != null) {
- out.flush();
Review comment:
`out.close()` works because this is indeed the last use of this stream.
Looks fine to me...
Unrelated to this change:
But the code is a bit strange anyway. The intent is obviously to get all
data from the command sent before the EOF is sent. But why not also flush or
close `err`? What happens if the command writes something to the error stream?
`err` gets closed only in the `close()` call in line 916, so that would flush
it after the EOF (and the exit status) was sent. That's probably not OK.
And anyway: stderr is traditionally "unbuffered", i.e., flushed on newlines.
I don't see anything in ChannelOutputStream that would implement that for
SSH_MSG_CHANNEL_EXTENDED_DATA. Maybe that's OK; the command would be
responsible for flushing it frequently then if desired.
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Issue Time Tracking
-------------------
Worklog Id: (was: 751401)
Time Spent: 1h 40m (was: 1.5h)
> Shell is not getting closed if the command has already closed the
> OutputStream it is using.
> -------------------------------------------------------------------------------------------
>
> Key: SSHD-1257
> URL: https://issues.apache.org/jira/browse/SSHD-1257
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.9.0
> Reporter: Vincent Latombe
> Priority: Major
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> When running a org.apache.sshd.server.command.Command, if it happens to close
> the OutputStream instance it is using, then later when the ssh session
> closes, it attempts to flush the output stream before closing it.
> This causes the following warning to be printed on server side
> {code:java}
> WARNING o.a.s.s.channel.ChannelSession#lambda$prepareCommand$0:
> onExit(ChannelSession[id=0,
> recipient=0]-ServerSessionImpl[admin@/0:0:0:0:0:0:0:1:49944]) code=0
> message='' SshChannelClosedException closing shell:
> flush(ChannelOutputStream[ChannelSession[id=0,
> recipient=0]-ServerSessionImpl[admin@/0:0:0:0:0:0:0:1:49944]]
> SSH_MSG_CHANNEL_DATA) length=0 - stream is already closed
> {code}
> and EOF is never sent to client.
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