January 2018
Beginner to intermediate
454 pages
10h 8m
English
Content preview from Rust Programming By Example
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Implementing the CWD command
The CWD command allows the user to change its current folder location. However, it's far from easy to do.
Before going into the implementation of this command, we'll need to discuss a potential security issue: paths.
Imagine the user is at the "/" location (which will corresponds to, say, /home/someone/somewhere) and requests foo/../../. If we just accept the path and move the user to this location, it'll end up at /home/someone. This means that the users could access all of your computer without issue. You see the problem now?
Luckily for us, Rust has a nice method on Path that allows us to fix this huge security issue. I'm talking about Path::canonicalize (which is an alias of the fs::canonicalize function). ...
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