Goldstein Lyor created SSHD-882:
-----------------------------------
Summary: Add support for STDERR stream usage in SFTP
Key: SSHD-882
URL: https://issues.apache.org/jira/browse/SSHD-882
Project: MINA SSHD
Issue Type: Improvement
Affects Versions: 2.1.0
Reporter: Goldstein Lyor
According to [version
4|https://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-3.1]:
{quote}
Packets are sent and received on stdout and stdin. Data sent on
stderr by the server SHOULD be considered debug or supplemental error
information, and MAY be displayed to the user.
For example, during initialization, there is no client request
active, so errors or warning information cannot be sent to the client
as part of the SFTP protocol at this early stage. However, the
errors or warnings MAY be sent as stderr text.
{quote}
We currently initialize the STDERR stream, but make no use of it. We should
provide a *configurable* way of using this stream - provided we find a use-case
for it and maybe some client/server(s) that make use of it. *Note:* by default,
the {{ChannelSession}} (that we use to consume SFTP data) does not accept
STDERR data:
{code:java}
@Override
protected void doWriteExtendedData(byte[] data, int off, long len) throws
IOException {
throw new UnsupportedOperationException("Server channel does not
support extended data");
}
{code}
so we need to consider very carefully what such a feature would require.
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