SSL_connect(3)

     SSL_connect(3)         0.9.6h (2002-07-19)         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. 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.

          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 continue the
              operation for non-blocking BIOs. Call SSL_get_error()

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     SSL_connect(3)         0.9.6h (2002-07-19)         SSL_connect(3)

              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)

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