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GNU/Linux |
CentOS 2.1AS(Slurm) |
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SSL_shutdown(3ssl) |
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SSL_shutdown − shut down a TLS/SSL connection
#include <openssl/ssl.h> int SSL_shutdown(SSL *ssl);
SSL_shutdown() shuts down an active TLS/SSL connection. It sends the "close notify" shutdown alert to the peer.
SSL_shutdown() tries to send the "close notify" shutdown alert to the peer. Whether the operation succeeds or not, the SSL_SENT_SHUTDOWN flag is set and a currently open session is considered closed and good and will be kept in the session cache for further reuse.
The behaviour of SSL_shutdown() depends on the underlying BIO.
If the underlying BIO is blocking, SSL_shutdown() will only return once the handshake has been finished or an error occurred.
If the underlying BIO is non-blocking, SSL_shutdown() will also return when the underlying BIO could not satisfy the needs of SSL_shutdown() to continue the handshake. In this case a call to SSL_get_error() with the return value of SSL_shutdown() will yield SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_shutdown(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue.
The following return values can occur:
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1 |
The shutdown was successfully completed. | ||
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0 |
The shutdown was not successful. Call SSL_get_error() with the return value ret to find out the reason. | ||
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-1 |
The shutdown was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. It can also occur of action is need to continue the operation for non-blocking BIOs. Call SSL_get_error() with the return value ret to find out the reason. |
SSL_get_error(3), SSL_connect(3), SSL_accept(3), SSL_set_shutdown(3), SSL_clear(3), SSL_free(3), ssl(3), bio(3)
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SSL_shutdown(3ssl) | |