scannedonly vfs module ported to samba 3.5

[Olivier Sessink]

Volker Lendecke wrote:
> On Sun, Dec 06, 2009 at 09:00:38PM +0100, Olivier Sessink wrote:
>> I now use open_udp_socket() for the UDP mode, but I don't see a function 
>> to open to an existing unix domain socket in DGRAM mode...?
> 
> Ok, right. I don't think we have a function for that. But to
> be honest -- why UDP and/or DGRAM?

1) connection reliability is not important in the design - if a file is 
not yet scanned for viruses, a request for scanning is always sent or 
re-sent (and the daemon is designed to handle that). It is thus not an 
issue if a request does not arrive - it will be requested again.

2) only short messages (filenames) are sent to the anti-virus scanner. 
Each single message easily fits into a datagram (I do pack multiple 
messages when possible to avoid a too-large burst of messages).

thus --> The design does not require STREAM or TCP --> using DGRAM 
results in very simple code and very little overhead.

regards,
	Olivier