Hi,

I want to add some form of validation for user input in the GUI so that the
user can be alerted when username, password etc. contains characters that
may not work.

So far the only characters that appear to be problematic are new line
('\n') and embedded '\0'.  As the management interface uses a line based
protocol with '\n' as the delimiter, it can't be a part of input strings
and breaks quoting.

Is there any other character that should be disallowed?

Thanks,

Selva
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