Enable error frame reception in raw mode

[occam25]

Summary

I was unable to receive error frame messages in RAW mode because the code to enable error frames in the raw socket was missing (although the CAN_ERR_FLAG is checked for every frame).

I have added the code to enable the error frames in the raw socket after it is created (it makes sense to do it there because in RAW mode the user expects to receive everything).

Now I do receive the error messages as expected.

[hartkopp]

Hello @occam25 ,
thanks for your patch!

The Error Messages can create a very high traffic load. Therefore switching "on" everything by default is not a good choice.

I would suggest to create a new command line option
{ "error-mask", required_argument, 0, 'e' },
where a user can provide an optional 32 bit error mask which is usually disabled by default.
Only expert users who know what they are doing should enable this option.

[occam25]

Hi @hartkopp ,
makes total sense. I have added the suggested option. Thanks!

[occam25]

The check that is failing seems to be a dependency problem when podman tries to build the image, nothing related to my changes

[marckleinebudde]

The check that is failing seems to be a dependency problem when podman tries to build the image, nothing related to my changes

yes, Debian experimental is sometimes inconsistent. no worries.

[marckleinebudde]

Thanks for your contribution, and implementing the requests by Oliver. I've some minor nitpicks.

[hartkopp]

Merged to master and reworked the help text afterwards.
Thanks @occam25 @marckleinebudde !

[marckleinebudde]

LGTM