[sane-devel] saned/network scanner

Alexander Pevzner pzz at apevzner.com
Fri Jan 22 19:21:40 GMT 2021

On 1/22/21 9:38 PM, Thiago Milczarek SayĆ£o wrote:
> I've been getting lots of attention to make my scanner work, thanks!
> But one question remains: Is it possible to make saned list network 
> scanners?

With existent saned - no. It requires some patching, though minimal.

saned obtains list of devices from the configured backends, using 
sane_get_devices() call of each backend. The second parameter of this 
call tells backend, should it return all devices, or only local devices. 
saned hardcodes this parameter to SANE_TRUE. Network backends consider 
their devices as non-local, and return empty list.

The simple trick could be to set this parameter to SANE_FALSE. However, 
if sane-net backend is configured, it may discover itself, reexport 
itself and so on - until saned crashed due to lack of memory. It needs 
to be handled somehow.

The simplest possible approach is to add an option, that sets second 
parameter of sane_get_devices() to SANE_FALSE, and document, that if 
this option is set, sane-net backend must be disabled. More robust 
approach would be to patch sane-net to ignore discovered addresses that 
match local interfaces.


	Wishes, Alexander Pevzner (pzz at apevzner.com)

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