关于SSL_do_handshake bloocking调用

Question

I am calling SSL_do_handshake with underlying BIO as blocking, means it will wait till handshake is done or error occured. Is there any way so that i can cancel this waiting call (waiting on SSL_do_handshake) from some other thread. i used SSL_clear,SSL_shutdown,SSL_free methods but thread is still waiting on SSL_do_handshake function call. Please help.

Answer 1

This is not nice way, but it should work:

Close the underlying TCP socket by using close() .

Any blocking IO with the socket will fail, and SSL_do_handshake() returns error.

But be carefully when closing sockets from other thread, because file descriptor numbers can be reused.