For open/opendir requests we create a new handle and close it
when the client sends an SSH_FXP_CLOSE but if we return an error the
client will never send the close packet so we have to close the handle
ourselves
Add LstatFileLister, an optional interface for FileLister, if this
interface is implemented Lstat requests will call it otherwirse they
will be handled in the same way as Stat, as before
we need to add a case for this packet inside the packet worker otherwise
it will be handled in hasHandle case and it will become a "Put" request.
Client side if a Truncate request is called on the open file we should
send a FSETSTAT packet, the request is on the handle, and not a SETSTAT
packet that should be used for paths and not for handle.
after processing a packet we keep in memory the allocated slices and we reuse
them for new packets.
Slices are allocated in:
- recvPacket
- when we receive a sshFxpReadPacket (downloads)
The allocated slices have a fixed size = maxMsgLength.
Allocated slices are referenced to the request order id and are marked for reuse
after a request is served in maybeSendPackets.
The allocator is added to the packetManager struct and it is cleaned at the end
of the Serve() function.
This allocation mode is optional and disabled by default
When fstat is called it now uses the handle to get the opened request,
pulls the filepath from that and creates a new request for the fstat
call. This eliminates the need to change the Method on the request
object and furthers the goal of eliminating post-creation mutation of
the request object to open up the possibility to eliminate or at least
reduce the use of the global request lock.
Just like with files, the call to the hander to create the Lister is
done when the OPENDIR packet is received. This eliminates the need for
the lock in the filelist() method and opens the path for eliminating
more locks.
Testing feasibility of creating the reader/writer when first receiving
the Open packet instead of waiting for the Get/Put.
This work is meant to make the Request locks easier to manage and
ultimately reducing/eliminating them as much as possible.
Many Unix assuptions have been made when testing.
Previously running tests on windows threw a panic
part way through the tests. After these changes
many more tests pass when the fix was isolated
to the test itself, and none panic.
Some tests are skipped because they do make sense
on windows (chmod, chown), while others are skipped
just to how the test was implemented.
Lastly, some of the external executables were hard coded.
Change these to look paths in TestMain first. This is done
to better support windows, where openssh may be installed and
sftp and sftp-server may both be in the PATH.
The initial Opendir packet is supposed to repond with an error status if
the directory wasn't found. It was just returning a handle without
checking, now it does a Stat on the path and only returns the handle if
the Stat is successful and it indicates it is a directory, otherwise it
returns an error.
Create a master Context in the per-session ReqeustServer.Serve method
that is then used as the parent for all Context's created in that
server. Its cancelFunc is then always called when Serve exits. This is
in line which out the http.serve code works.
Each Request gets a child WithCancel context created in the
requestFromPacket call. This Context is still closed on request.close().
Cassondra Foesch
Nicola Murino
Fazlul Shahriar
Cassondra Foesch
Tommie Gannert
John Eikenberry
Daniel Theophanes