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https://issues.apache.org/jira/browse/SSHD-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Wolf updated SSHD-1348:
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Issue Type: Bug (was: Question)
> Client SSH_FXP_READ() with lenght = 0 causes SSH_FX_INVALID_PARAMETER into
> Apache SSHD SFTP Server
> --------------------------------------------------------------------------------------------------
>
> Key: SSHD-1348
> URL: https://issues.apache.org/jira/browse/SSHD-1348
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.16.0
> Reporter: Roberto Deandrea
> Assignee: Thomas Wolf
> Priority: Minor
> Fix For: 2.17.0
>
> Attachments: sftp-read-empty.py
>
>
> During SFTP client get of empty file setting lenght=0 , Apache SSHD replies
> with SSH_FXP_STATUS with SSH_FX_INVALID_PARAMETER.
> We have noticed 2 different checks on buffer lenght.
> In method SftpSubsystem.doRead() the check on length is the following:
> *{color:#242424}ValidateUtils.checkTrue((long)length > 0L, "Invalid read
> length: %d", (long)length);{color}*
> In method {color:#242424}AbstractSftpSubsystemHelper{color}.doRead() the
> check on length is the following :
> *{color:#242424}ValidateUtils.checkTrue(readLen >= 0, "Illegal requested read
> length: %d", (long)readLen);{color}*
>
> Q1. Is there a reason why the check on length are different ?
> Q2. Is possble to read a file setting buffer lenght = 0 ?
>
> Thank you for your cooperation.
> Roberto Deandrea
>
> P.S. Attached to this Jira you can find a python script to simply reproduce
> this issue.
>
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