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musings about scp

This commit is contained in:
Greg Alexander 2014-12-20 22:53:07 -05:00
parent 93760bfb7b
commit 3fae66e571

30
NOTES
View File

@ -72,6 +72,36 @@ it uses select(), I'm not sure how I would honor Thread.interrupt() or
whatever. It's not guaranteed to interrupt select(), and I'm not keen on
adding an arbitrary timeout/polling feature to it.
December 20, 2014.
So, I added a builtin scp endpoint. It was pretty straight forward,
except dropbear defaults to vfork(), which blocks the parent until the
child runs execve()!!
Anyways, I noticed that scp doesn't quote it's arguments to the remote
scp. That means youcan't conveniently copy a remote file with a space in
its name (it becomes two files). But the upside is that this is where
wildcards are handled -- by the shell!
So I need to either run it as a separate executable launched through the
shell, or make my own implementation of wildcards.
It is easy, using a $(BUILD_EXECUTABLE) script, to get ndk to build an
executable. But it is only packaged up if it is named "gdbserver" (and
debug apk), or "libfoo.so". The good news is that libfoo.so can be
executed in /data/data/org.galexander.sshd/lib/libfoo.so, so that is a
viable option.
Doing the expansion myself is not necessarily hard either, though. I
need a library function called glob(), which is apparently not part of
bionic. But I have the idea some cut and paste would resolve that with
very little extra work on my part.
XXX - fix scp "protocol error"
XXX - honor scp wildcards somehow
XXX - zlib
XXX - rsync