[Bug 2021] sftp resume support (using size and offset)

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2021

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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                 CC|                            |djm at mindrot.org

--- Comment #4 from Damien Miller <djm at mindrot.org> ---
We've considered doing this in the past but was worried about the
wording in section 6.1 of
http://www.openssh.com/txt/draft-ietf-secsh-filexfer-02.txt allowing
the server to reorder the responses from the block transfers in such a
way that the client got a wrong idea of the high water mark.

Upon re-reading the spec, the wording is still unclear. The first
paragraph seems to unequivocally ban such a reordering, but then the
second paragraph seems to soften that.

An implementor might read both and conclude "it's okay for me to _send_
the responses in any order, so long as the blocks hit the disk in the
order they were requested".

IMO this would be stretching hard against the spirit of the spec and I
don't know of any implementation that would do this. Perhaps we should
just treat them as broken...

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