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 sat-
       isfy the needs of SSL_connect() to continue the hand-
       shake, 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 sat-
       isfy 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.

       o   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.

       <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 con-
           tinue 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_hand-
       shake(3), SSL_CTX_new(3)



0.9.7c                     2003-06-03            SSL_connect(3)
