Several server operators have requested the ability to know how their clients are connecting to their server. The latest TF update added a new client convar, cl_connectmethod, that contains a string value that indicates how the client connected to your server. It's sent in the same way as cl_rate and others, and a plugin should be able to access this information. It will be empty if joined directly through a console "connect" command. I apologize that I don't have the list of values at hand, but I'm sure some helpful server operator or plugin author will post the list of codes that are sent.
Please be aware that the field is not secure, and the work required to secure it is not trivial. Without too much effort a client could send you pretty much any string they want. So this is best used for general reporting purposes and understanding where your players are coming from, not to treat players differently based on how they connect. This is a Source engine change, so it will be available in CS:S, DoD:S, and HL2:DM in the next update for those games.
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