CAN interface support#1858
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Add a new "canpipe" verb to the ``labgrid-raw-interface`` helper script, that configures a can interface according to its arguments, opens and binds a raw can socket to the interface, and starts the ``labgrid-tap-fwd`` script to pipe frames between the interface and stdin/stdout. This allows a client to create a corresponding pipe on its own end to pipe the frames to/from a local virtual can interface. Signed-off-by: Martin Hundebøll <martin@geanix.com>
To be able to pipe CAN frames to/from a remote agent, the network namespace agent should support creating a virtual CAN interface. This allows creating the pipe unprivileged, which is a prerequisite for testing remote CAN interfaces with labgrid. Signed-off-by: Martin Hundebøll <martin@geanix.com>
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## master #1858 +/- ##
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+ Coverage 45.8% 45.9% +0.1%
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Files 182 181 -1
Lines 14718 14639 -79
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- Hits 6743 6728 -15
+ Misses 7975 7911 -64
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Add a driver that utilizes the CAN pipe support added in the previous commits. The driver is primarily intended to used to send and receive frames through its ``recv()`` and ``send()`` methods, but it also provides CAN interface access to "external" programs using the ``namespace_prefix`` property. Signed-off-by: Martin Hundebøll <martin@geanix.com>
Since the unshare method doesn't create a mount namespace, the nsenter method shouldn't try to enter a mount namespace. Signed-off-by: Martin Hundebøll <martin@geanix.com>
Signed-off-by: Martin Hundebøll <martin@geanix.com>
The tests require the `vcan` kernel module to be available, and a `vcan0` module must ve created manually before running the tests. The `vcan` kernel module is not available in the Github Runner (azure) images, but a request has been submitted to enable it in the Azure kernel packages: actions/runner-images#13991 Signed-off-by: Martin Hundebøll <martin@geanix.com>
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Description
Add a driver for CAN interfaces. Local CAN interfaces are "just" opened. Remote (exporter) interfaces are piped through SSH similar to the recently added raw network interface pipe support.
The driver has been tested both on a local CAN interface (with and without privileges), and on a remote/exported CAN interface.
Checklist
Fixes #1289
Replaces #1719