Sentinel or Master by ip/port only

[Sergey Sudakovich]

If I have only an ip/port only, what is the most reliable way to tell if I am connected to a master or a sentinel?

One approach is to call INFO and check the 'role', but there is no 'role' when I am connecting to a sentinel. Anybody can suggest a more elegant way?

[Tuco]

When you do "info", there is something called "redis_mode" which is "sentinel" if you are connected to sentinel and has other values otherwise.