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By just splitting at spaces, multi-word arguments are torn apart even if quoted. In case of custom ssh-cmd, this makes it practically impossible to set certian options through `ssh -o`. shlex splits arguments like a shell and e.g. respects quotes.
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I tried setting a multi-word SSH option through
ssh -oandsshuttle -e. This didn't work because regardless of the quoting, sshuttle always split the option into multiple arguments and made the quotes become a literal part of the args.The problem turned out to be caused by shuttle always splitting the arguments at spaces, which makes it practically impossible to have multi-word arguments.
This patch solves the issue by using Python's shlex module, which splits arguments like a shell and e.g. respects quotes. I found one more similar line in the sshuttle code and fixed that one as well.