In our use of zeromq, we have had other software connect to a listening TCP stream socket, and then just sit there with the socket open. If the connecting end sends enough bytes, that will initiate handshaking, which will either succeed, or fail and disconnect. But if it sends nothing, or too few bytes for handshaking to reach a conclusion, the socket just sits there open. So I added a timer in stream_engine to limit the time from connect to the end of handshaking, and disconnect on timeout. This also works with zeromq sockets that are connecting, if the accepting end does not start handshaking.
If this seems useful to add to zeromq, I can make a pull request. I can provide a unit test and documentation update. I made this time limit configurable by zmq_setsockopt as ZMQ_HANDSHAKE_IVL, defaulted to 30 seconds. Or it could be defaulted to 0 (no limit), for backward compatibility. Any suggestions on this? It seems to me that such "hanging" connects could be used as an attack. Will Strang
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