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SSL_connect(3)                                     OpenSSL                                    SSL_connect(3)



NAME
       SSL_connect - initiate the TLS/SSL handshake with an TLS/SSL server

SYNOPSIS
        #include <openssl/ssl.h>

        int SSL_connect(SSL *ssl);

DESCRIPTION
       SSL_connect() initiates the TLS/SSL handshake with a server. The communication channel must already
       have been set and assigned to the ssl by setting an underlying BIO.

NOTES
       The behaviour of SSL_connect() depends on the underlying BIO.

       If the underlying BIO is blocking, SSL_connect() will only return once the handshake has been
       finished or an error occurred.

       If the underlying BIO is non-blocking, SSL_connect() will also return when the underlying BIO could
       not satisfy the needs of SSL_connect() to continue the handshake, indicating the problem by the
       return value -1.  In this case a call to SSL_get_error() with the return value of SSL_connect() 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_connect().  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.

RETURN VALUES
       The following return values can occur:

       1.  The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established.

       2.  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() with the return value ret to find out the reason.

       3.  <0

           The TLS/SSL handshake was not successful, because a fatal error occurred either at the protocol
           level or a connection failure occurred. The shutdown was not clean. 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.

SEE ALSO
       SSL_get_error(3), SSL_accept(3), SSL_shutdown(3), ssl(3), bio(3), SSL_set_connect_state(3),
       SSL_do_handshake(3), SSL_CTX_new(3)

POD ERRORS
       Hey! The above document had some coding errors, which are explained below:

       Around line 49:
           You have '=item 0' instead of the expected '=item 2'

       Around line 55:
           Expected '=item 3'



0.9.7l                                           2003-06-03                                   SSL_connect(3)