SSL_connect

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 commu-
       nication 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. 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 connec-
           tion has been established.

       0   The TLS/SSL handshake was not successful but was shut down con-
           trolled and by the specifications of the TLS/SSL protocol. Call
           SSL_get_error() with the return value ret to find out the reason.

       <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)



0.9.7a                            2002-07-19                    SSL_connect(3)