Sortix nightly manual
This manual documents Sortix nightly, a development build that has not been officially released. You can instead view this document in the latest official manual.
|SSL_DO_HANDSHAKE(3)||Library Functions Manual||SSL_DO_HANDSHAKE(3)|
perform a TLS/SSL handshake
SSL_do_handshake() will wait for a SSL/TLS handshake to take place. If the connection is in client mode, the handshake will be started. The handshake routines may have to be explicitly set in advance using either SSL_set_connect_state(3) or SSL_set_accept_state(3). The behaviour of
SSL_do_handshake() depends on the underlying BIO. If the underlying BIO is blocking,
SSL_do_handshake() will only return once the handshake has been finished or an error occurred. If the underlying BIO is non-blocking,
SSL_do_handshake() will also return when the underlying BIO could not satisfy the needs of
SSL_do_handshake() to continue the handshake. In this case a call to SSL_get_error(3) with the return value of
SSL_do_handshake() will yield
SSL_ERROR_WANT_WRITE. The calling process then must repeat the call after taking appropriate action to satisfy the needs of
SSL_do_handshake(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select(2) 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 TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error(3) with the return value ret to find out the reason.
- The TLS/SSL handshake was successfully completed, and a TLS/SSL connection has been established.
- The TLS/SSL handshake was not successful because either a fatal error occurred at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur if action is needed to continue the operation for non-blocking BIOs. Call SSL_get_error(3) with the return value ret to find out the reason.
SSL_do_handshake() first appeared in SSLeay 0.8.0 and has been available since OpenBSD 2.4.
|March 27, 2018||Debian|