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It's strongly recommended to update your libmodbus library if you use it in a slave/server application in a not trusted environment. Debian package of libmodbus 3.0.4 already contains a patch to mitigate the exploit but the patch isn't as strong than this one.
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Warning, modbus_receive returns 0 when a query is ignored. - function removed from TCP and RTU code and from backend structure - updated documentation - updated examples
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Split the original modbus_receive function in two functions to avoid the strange -1 value to ignore the sockfd argument.
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These functions have no meaning in RTU so it's better to specialize the names and remove them from the backend. - remove the functions from the backend - update tests to handle RTU mode (master and slave) - add command line options to tests (rtu or tcp)
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All private functions and constants are now prefixed by _. The modbus protocol uses entry points to call specific functions.
