netsane running ...

becka@sunserver1.rz.uni-duesseldorf.de
Sun, 19 Jan 1997 01:19:20 +0100 (MET)

Hi !

I found the time to get netsane running. I have tested it with the
pnm-backend running on a remote machine.

It isn't really complete now, as I am having trouble with the
COPT (control_option) call.

It has to transfer the parameters of

SANE_Status sane_control_option (SANE_Handle handle, SANE_Int option,
SANE_Action action, void *value,
SANE_Int * info);

The problem is the void *value, as it can hold different datatypes.

The datatype is not known within the netsane client (except by querying the
server, which seems inefficient), so this is a problem, as obviously a
string needs to be transferred differently than an int.

I suggest adding a parameter SANE_Value_Type type to the call. This will
enable the client and lateron the server to do the right thing.

I.e.:

SANE_Status sane_control_option (SANE_Handle handle, SANE_Int option,
SANE_Action action,
SANE_Value_Type type,void *value,
SANE_Int * info);

Should be no big deal to rewrite the clients - right ?

Another issue is authorization :

As authorization might be required quite about any time (when opening a
server connection, when opening a specific device, there might even be cases
[picture servers] where auth_at_sane_start() might be appropriate ...) ,
I suggest to add authorization in the following way :

Register an "authorization-callback" by adding a second argument to
sane_init().

NULL would mean : This client is dumb. Authorization requests automatically
fail.

Otherwise we register an authorization function

sane_auth(char *domain,char *username,char *password)

Please note, that this doesn't make sense for "normal" libsanes, as a "bad"
frontend could override authentication within the lib by using "brute force".

It only makes sense, when the authenticating authority runs in a seperate
namespace.

O.K. - should I make these changes ?

I have added the current state of the netsane subdir (can be installed
into sane-032, only slight changes to main configure-file required to add
the new subdir) for you to have a look at it.

As I said, it doesn't really work right now, but it is close to that ...

CU,Andy

begin 644 netsane.tar.gz
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#R```
`
end

-- 
==============================================================================
Andreas Beck              |  Email :  <becka@sunserver1.rz.uni-duesseldorf.de>
===  World-Wide-Web URL :  http://sunserver1.rz.uni-duesseldorf.de/~becka  ===
==============================================================================

---
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