The reason for the check on port number is that generally any user can choose a high port number, but below 1024 is reserved to root. So if you come from a low port you at least have special permisions.

Incidentally this is why many standard protocols are below 1024. For instance ftp on 21, http on 80, imap3 on 220, https on 443 and so on. (On many *nix systems you can look at /etc/services to find these numbers - I certainly cannot recite these off of the top of my head! :-)

In reply to Re (tilly) 1: Writing an rsh client (Moved from Q&A) by tilly
in thread Writing an rsh client (Moved from Q&A) by Russ

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