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<div class="title">Globus XIO GSI Driver </div>  </div>
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<div class="textblock"><h1><a class="anchor" id="globus_xio_driver_instance_sect"></a>
Opening/Closing</h1>
<p>An XIO handle with the gsi driver can be created with either globus_xio_handle_create () or globus_xio_server_register_accept ().</p>
<p>If the handle is created with globus_xio_server_register_accept (), the globus_xio_register_open () call will proceed to accept a GSSAPI security context. Upon successful completion of the open (after the open callback has been called) the application may proceed to read or write data associated with the GSI session.</p>
<p>If the handle is created with globus_xio_handle_create (), then the XIO handle will implement the client-side (init) of the GSSAPI call sequence and establish a security context with the accepting side indicated by the contact_string passed to globus_xio_register_open ().</p>
<h1><a class="anchor" id="globus_xio_driver_readwrite_sect"></a>
Reading/Writing</h1>
<p>The GSI driver behaves similar to the underlying transport driver with respect to reads and writes, except for the try-read and try-write operations (ie. waitforbytes ==0) which always return immediately. This is due to the fact that the security layer needs to read and write tokens of a certain minimal size and thus needs to rely on the underlying transport to handle greater than 0 reads/write which is not possible in "try" mode.</p>
<h1><a class="anchor" id="globus_xio_gsi_driver_server_sect"></a>
Server</h1>
<p>globus_xio_server_create() causes a new transport-specific listener socket to be created to handle new GSI connections. globus_xio_server_register_accept() will accept a new connection for processing. globus_xio_server_register_close() cleans up the internal resources associated with the http server and calls close on the listener.</p>
<p>All accepted handles inherit all GSI-specific attributes set in the attr to globus_xio_server_create(), but can be overridden with the attr to globus_xio_register_open(). Furthermore, accepted handles will use the GSSAPI accept security context call unless explicitly overridden during the globus_xio_register_open() call ( GLOBUS_XIO_GSI_FORCE_SERVER_MODE).</p>
<h1><a class="anchor" id="globus_xio_gsi_driver_envs_sect"></a>
Environment Variables</h1>
<p>The gsi driver uses the following environment variables</p><ul>
<li>X509_USER_PROXY</li>
<li>X509_USER_CERT</li>
<li>X509_USER_KEY</li>
<li>X509_CERT_DIR</li>
</ul>
<p>For details see <a href="http://toolkit.globus.org/toolkit/docs/latest-stable/gsic/pi/#gsic-pi-env">Globus: GSI Environment Variables</a></p>
<h1><a class="anchor" id="globus_xio_gsi_driver_cntls_sect"></a>
Attributes and Cntls</h1>
<p>GSI driver specific attrs and cntls</p>
<dl class="section see"><dt>See also</dt><dd>globus_xio_attr_cntl () </dd>
<dd>
globus_xio_handle_cntl ()</dd></dl>
<h1><a class="anchor" id="globus_xio_gsi_driver_errors_sect"></a>
Error Types</h1>
<p>The GSI driver uses mostly GSSAPI calls, so it generally just wraps the underlying GSSAPI errors or uses generic XIO errors.</p>
<dl class="section see"><dt>See also</dt><dd>globus_xio_driver_error_match () </dd>
<dd>
globus_error_gssapi_match () </dd>
<dd>
globus_error_match_openssl_error () </dd></dl>
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