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<title>Example: GSKit secure server with asynchronous handshake </title>
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<h1 class="topictitle1">Example: GSKit secure server with asynchronous handshake </h1>
<div><p>The <span class="apiname">gsk_secure_soc_startInit()</span> API allows you
to create secure server applications that can handle request asynchronously.</p>
<div class="section"><p>The following code sample provides an example of how this API
can be used. It is similar to the GSKit secure server with asynchronous data
receive example, but uses this new API to start a secure session. </p>
</div>
<div class="section"><p>The following graphic shows the function calls used to negotiate
an asynchronous handshake on a secure server:</p>
<br /><img src="rzab6514.gif" alt="Socket flow of events: GSKit secure server that uses asynchronous handshake" /><br /></div>
<div class="section"><p>To view the client portion of this graphic, see <a href="xgskclient.dita#xgskclient/gskclgraphic" target="_blank">GSKit client </a>.</p>
</div>
<div class="section"><h4 class="sectiontitle">Socket flow of events: GSKit secure server that uses asynchronous
handshake</h4><p>This flow describes the socket calls in the following
sample application.</p>
<ol><li>The <span class="apiname">QsoCreateIOCompletionPort()</span> function creates an
I/O completion port.</li>
<li>The <span class="apiname">pthread_create</span> function creates a worker thread
to process all client requests. The worker thread waits for client requests
to arrive on the I/O completion port just created.</li>
<li>A call to <span class="apiname">gsk_environment_open()</span> to obtain a handle
to an SSL environment.</li>
<li>One or more calls to gsk_attribute_set_xxxxx() to set attributes of the
SSL environment. At a minimum, either a call to <span class="apiname">gsk_attribute_set_buffer()</span> to
set the GSK_OS400_APPLICATION_ID value or to set the GSK_KEYRING_FILE value.
Only one of these should be set. It is preferred that you use the GSK_OS400_APPLICATION_ID
value. Also ensure you set the type of application (client or server), GSK_SESSION_TYPE,
using <span class="apiname">gsk_attribute_set_enum()</span>.</li>
<li>A call to <span class="apiname">gsk_environment_init()</span> to initialize this
environment for SSL processing and to establish the SSL security information
for all SSL sessions that run using this environment.</li>
<li>The <span class="apiname">socket</span> function creates a socket descriptor. The
server then issues the standard set of socket calls: <span class="apiname">bind()</span>, <span class="apiname">listen()</span>,
and <span class="apiname">accept()</span> to enable a server to accept incoming connection
requests.</li>
<li>The <span class="apiname">gsk_secure_soc_open()</span> function obtains storage
for a secure session, sets default values for attributes, and returns a handle
that must be saved and used on secure session-related function calls. </li>
<li>One or more calls to gsk_attribute_set_xxxxx() to set attributes of the
secure session. At a minimum, a call to <span class="apiname">gsk_attribute_set_numeric_value()</span> to
associate a specific socket with this secure session.</li>
<li>The <span class="apiname">gsk_secure_soc_startInit()</span> function
starts an asynchronous negotiation of a secure session, using the attributes
set for the SSL environment and the secure session. Control returns to the
program here. When the handshake processing is completed, the completion port
is posted with the results. The thread can continue on with other processing;
however, for simplicity, wait here for worker thread to complete. <div class="note"><span class="notetitle">Note:</span> Typically,
a server program must provide a certificate for an SSL handshake to succeed.
A server must also have access to the private key that is associated with
the server certificate and the key database file where the certificate is
stored. In some cases, a client must also provide a certificate during the
SSL handshake processing. This occurs if the server which the client is connecting
to has enabled client authentication. The <span class="apiname">gsk_attribute_set_buffer</span>(GSK_OS400_APPLICATION_ID)
or <span class="apiname">gsk_attribute_set_buffer</span>(GSK_KEYRING_FILE) API calls
identify (though in dissimilar ways) the key database file from which the
certificate and private key that are used during the handshake are obtained.</div>
</li>
<li>The <span class="apiname">pthread_join</span> synchronizes the server
and worker programs. This function waits for the thread to end, detaches the
thread, then returns the threads exit status to the server.</li>
<li>The <span class="apiname">gsk_secure_soc_close()</span> function ends the secure
session.</li>
<li>The <span class="apiname">gsk_environment_close()</span> function closes the SSL
environment. </li>
<li>The <span class="apiname">close()</span> function ends the listening socket.</li>
<li>The <span class="apiname">close()</span> ends the accepted (client connection) socket.</li>
<li>The <span class="apiname">QsoDestroyIOCompletionPort()</span> function destroys
the completion port.</li>
</ol>
</div>
<div class="section"><h4 class="sectiontitle">Socket flow of events: Worker thread that process secure asynchronous
requests</h4><ol><li>After the server application creates a worker thread, it waits for server
to send it the incoming client request to process. The <span class="apiname">QsoWaitForIOCompletionPort()</span> function
waits on the supplied IO completion port that was specified by the server.
This call waits until the <span class="apiname">gsk_secure_soc_startInit()</span> is
completed. </li>
<li>As soon as the client request has been received, the <span class="apiname">gsk_attribute_get_numeric_value()</span> function
gets the socket descriptor associated with the secure session.</li>
<li>The <span class="apiname">gsk_secure_soc_read()</span> function receives a message
from the client using the secure session.</li>
<li>The <span class="apiname">gsk_secure_soc_write()</span> function sends the message
to the client using the secure session.</li>
</ol>
</div>
<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
<pre>/* GSK Asynchronous Server Program using Application Id*/
/* and gsk_secure_soc_startInit() */
/* Assummes that application id is already registered */
/* and a certificate has been associated with the */
/* application id. */
/* No parameters, some comments and many hardcoded */
/* values to keep it short and simple */
/* use following command to create bound program: */
/* CRTBNDC PGM(MYLIB/GSKSERVSI) */
/* SRCFILE(MYLIB/CSRC) */
/* SRCMBR(GSKSERVSI) */
#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;sys/types.h&gt;
#include &lt;sys/socket.h&gt;
#include &lt;gskssl.h&gt;
#include &lt;netinet/in.h&gt;
#include &lt;arpa/inet.h&gt;
#include &lt;errno.h&gt;
#define _MULTI_THREADED
#include "pthread.h"
#include "qsoasync.h"
#define Failure 0
#define Success 1
#define TRUE 1
#define FALSE 0
void *workerThread(void *arg);
/********************************************************************/
/* Descriptive Name: Master thread will establish a client */
/* connection and hand processing responsibility */
/* to a worker thread. */
/* Note: Due to the thread attribute of this program, spawn() must */
/* be used to invoke. */
/********************************************************************/
int main(void)
{
gsk_handle my_env_handle=NULL; /* secure environment handle */
gsk_handle my_session_handle=NULL; /* secure session handle */
struct sockaddr_in address;
int buf_len, on = 1, rc = 0;
int sd = -1, lsd = -1, al, ioCompPort = -1;
int successFlag = FALSE;
pthread_t thr;
void *status;
Qso_OverlappedIO_t ioStruct;
/*********************************************/
/* Issue all of the command in a do/while */
/* loop so that clean up can happen at end */
/*********************************************/
do
{
/*********************************************/
/* Create an I/O completion port for this */
/* process. */
/*********************************************/
if ((ioCompPort = QsoCreateIOCompletionPort()) &lt; 0)
{
perror("QsoCreateIOCompletionPort() failed");
break;
}
/*********************************************/
/* Create a worker thread */
/* to process all client requests. The */
/* worker thread will wait for client */
/* requests to arrive on the I/O completion */
/* port just created. */
/*********************************************/
rc = pthread_create(&amp;thr, NULL, workerThread, &amp;ioCompPort);
if (rc &lt; 0)
{
perror("pthread_create() failed");
break;
}
/* open a gsk environment */
rc = errno = 0;
printf("gsk_environment_open()\n");
rc = gsk_environment_open(&amp;my_env_handle);
if (rc != GSK_OK)
{
printf("gsk_environment_open() failed with rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* set the Application ID to use */
rc = errno = 0;
rc = gsk_attribute_set_buffer(my_env_handle,
GSK_OS400_APPLICATION_ID,
"MY_SERVER_APP",
13);
if (rc != GSK_OK)
{
printf("gsk_attribute_set_buffer() failed with rc = %d and errno = %d.\n"
,rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* set this side as the server */
rc = errno = 0;
rc = gsk_attribute_set_enum(my_env_handle,
GSK_SESSION_TYPE,
GSK_SERVER_SESSION);
if (rc != GSK_OK)
{
printf("gsk_attribute_set_enum() failed with rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* by default SSL_V2, SSL_V3, and TLS_V1 are enabled */
/* We will disable SSL_V2 for this example. */
rc = errno = 0;
rc = gsk_attribute_set_enum(my_env_handle,
GSK_PROTOCOL_SSLV2,
GSK_PROTOCOL_SSLV2_OFF);
if (rc != GSK_OK)
{
printf("gsk_attribute_set_enum() failed with rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* set the cipher suite to use. By default our default list */
/* of ciphers is enabled. For this example we will just use one */
rc = errno = 0;
rc = gsk_attribute_set_buffer(my_env_handle,
GSK_V3_CIPHER_SPECS,
"05", /* SSL_RSA_WITH_RC4_128_SHA */
2);
if (rc != GSK_OK)
{
printf("gsk_attribute_set_buffer() failed with rc = %d and errno = %d.\n"
,rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* Initialize the secure environment */
rc = errno = 0;
printf("gsk_environment_init()\n");
rc = gsk_environment_init(my_env_handle);
if (rc != GSK_OK)
{
printf("gsk_environment_init() failed with rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* initialize a socket to be used for listening */
printf("socket()\n");
lsd = socket(AF_INET, SOCK_STREAM, 0);
if (lsd &lt; 0)
{
perror("socket() failed");
break;
}
/* set socket so can be reused immediately */
rc = setsockopt(lsd, SOL_SOCKET,
SO_REUSEADDR,
(char *)&amp;on,
sizeof(on));
if (rc &lt; 0)
{
perror("setsockopt() failed");
break;
}
/* bind to the local server address */
memset((char *) &amp;address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_port = 13333;
address.sin_addr.s_addr = 0;
printf("bind()\n");
rc = bind(lsd, (struct sockaddr *) &amp;address, sizeof(address));
if (rc &lt; 0)
{
perror("bind() failed");
break;
}
/* enable the socket for incoming client connections */
printf("listen()\n");
listen(lsd, 5);
if (rc &lt; 0)
{
perror("listen() failed");
break;
}
/* accept an incoming client connection */
al = sizeof(address);
printf("accept()\n");
sd = accept(lsd, (struct sockaddr *) &amp;address, &amp;al);
if (sd &lt; 0)
{
perror("accept() failed");
break;
}
/* open a secure session */
rc = errno = 0;
printf("gsk_secure_soc_open()\n");
rc = gsk_secure_soc_open(my_env_handle, &amp;my_session_handle);
if (rc != GSK_OK)
{
printf("gsk_secure_soc_open() failed with rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* associate our socket with the secure session */
rc=errno=0;
rc = gsk_attribute_set_numeric_value(my_session_handle,
GSK_FD,
sd);
if (rc != GSK_OK)
{
printf("gsk_attribute_set_numeric_value() failed with rc = %d ", rc);
printf("and errno = %d.\n", errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/*********************************************/
/* Issue gsk_secure_soc_startInit() to */
/* process SSL Handshake flow asynchronously */
/*********************************************/
/*********************************************/
/* initialize Qso_OverlappedIO_t structure - */
/* reserved fields must be hex 00's. */
/*********************************************/
memset(&amp;ioStruct, '\0', sizeof(ioStruct));
/*********************************************/
/* Store the session handle in the */
/* Qso_OverlappedIO_t descriptorHandle field.*/
/* This area is used to house information */
/* defining the state of the client */
/* connection. Field descriptorHandle is */
/* defined as a (void *) to allow the server */
/* to address more extensive client */
/* connection state if needed. */
/*********************************************/
ioStruct.descriptorHandle = my_session_handle;
/* initiate the SSL handshake */
rc = errno = 0;
printf("gsk_secure_soc_startInit()\n");
rc = gsk_secure_soc_startInit(my_session_handle, ioCompPort, &amp;ioStruct);
if (rc != GSK_OS400_ASYNCHRONOUS_SOC_INIT)
{
printf("gsk_secure_soc_startInit() rc = %d and errno = %d.\n",rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
else
printf("gsk_secure_soc_startInit got GSK_OS400_ASYNCHRONOUS_SOC_INIT\n");
/*********************************************/
/* This is where the server can loop back */
/* to accept a new connection. */
/*********************************************/
/*********************************************/
/* Wait for worker thread to finish */
/* processing client connection. */
/*********************************************/
rc = pthread_join(thr, &amp;status);
/* check status of the worker */
if ( rc == 0 &amp;&amp; (rc = __INT(status)) == Success)
{
printf("Success.\n");
printf("Success.\n");
successFlag = TRUE;
}
else
{
perror("pthread_join() reported failure");
}
} while(FALSE);
/* disable the SSL session */
if (my_session_handle != NULL)
gsk_secure_soc_close(&amp;my_session_handle);
/* disable the SSL environment */
if (my_env_handle != NULL)
gsk_environment_close(&amp;my_env_handle);
/* close the listening socket */
if (lsd &gt; -1)
close(lsd);
/* close the accepted socket */
if (sd &gt; -1)
close(sd);
/* destroy the completion port */
if (ioCompPort &gt; -1)
QsoDestroyIOCompletionPort(ioCompPort);
if (successFlag)
exit(0);
exit(-1);
}
/********************************************************************/
/* Function Name: workerThread */
/* */
/* Descriptive Name: Process client connection. */
/* */
/* Note: To make the sample more straight forward the main routine */
/* handles all of the clean up although this function can */
/* be made responsible for the clientfd and session_handle. */
/********************************************************************/
void *workerThread(void *arg)
{
struct timeval waitTime;
int ioCompPort, clientfd;
Qso_OverlappedIO_t ioStruct;
int rc, tID;
int amtWritten, amtRead;
char buff[1024];
gsk_handle client_session_handle;
pthread_t thr;
pthread_id_np_t t_id;
t_id = pthread_getthreadid_np();
tID = t_id.intId.lo;
/*********************************************/
/* I/O completion port is passed to this */
/* routine. */
/*********************************************/
ioCompPort = *(int *)arg;
/*********************************************/
/* Wait on the supplied I/O completion port */
/* for the SSL handshake to complete. */
/*********************************************/
waitTime.tv_sec = 500;
waitTime.tv_usec = 0;
sleep(4);
printf("QsoWaitForIOCompletion()\n");
rc = QsoWaitForIOCompletion(ioCompPort, &amp;ioStruct, &amp;waitTime);
if ((rc == 1) &amp;&amp;
(ioStruct.returnValue == GSK_OK) &amp;&amp;
(ioStruct.operationCompleted == GSKSECURESOCSTARTINIT))
/*********************************************/
/* SSL Handshake has completed. */
/*********************************************/
;
else
{
printf("QsoWaitForIOCompletion()/gsk_secure_soc_startInit() failed.\n");
printf("rc == %d, returnValue - %d, operationCompleted = %d\n",
rc, ioStruct.returnValue, ioStruct.operationCompleted);
perror("QsoWaitForIOCompletion()/gsk_secure_soc_startInit() failed");
return __VOID(Failure);
}
/*********************************************/
/* Obtain the session handle associated */
/* with the client connection. */
/*********************************************/
client_session_handle = ioStruct.descriptorHandle;
/* get the socket associated with the secure session */
rc=errno=0;
printf("gsk_attribute_get_numeric_value()\n");
rc = gsk_attribute_get_numeric_value(client_session_handle,
GSK_FD,
&amp;clientfd);
if (rc != GSK_OK)
{
printf("gsk_attribute_get_numeric_value() rc = %d and errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
return __VOID(Failure);
}
/* memset buffer to hex zeros */
memset((char *) buff, 0, sizeof(buff));
amtRead = 0;
/* receive a message from the client using the secure session */
printf("gsk_secure_soc_read()\n");
rc = gsk_secure_soc_read(client_session_handle,
buff,
sizeof(buff),
&amp;amtRead);
if (rc != GSK_OK)
{
printf("gsk_secure_soc_read() rc = %d and errno = %d.\n",rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
return;
}
/* write results to screen */
printf("gsk_secure_soc_read() received %d bytes, here they are ...\n",
amtRead);
printf("%s\n",buff);
/* send the message to the client using the secure session */
amtWritten = 0;
printf("gsk_secure_soc_write()\n");
rc = gsk_secure_soc_write(client_session_handle,
buff,
amtRead,
&amp;amtWritten);
if (amtWritten != amtRead)
{
if (rc != GSK_OK)
{
printf("gsk_secure_soc_write() rc = %d and errno = %d.\n",rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
return __VOID(Failure);
}
else
{
printf("gsk_secure_soc_write() did not write all data.\n");
return __VOID(Failure);
}
}
/* write results to screen */
printf("gsk_secure_soc_write() wrote %d bytes...\n", amtWritten);
printf("%s\n",buff);
return __VOID(Success);
}
/* end workerThread */</pre>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="x1ssl.htm" title="You can create secure server and clients using either the Global Secure ToolKit (GSKit) APIs or the Secure Sockets Layer (SSL_) APIs.">Examples: Establish secure connections</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="cgskit.htm" title="Global Secure ToolKit (GSKit) is a set of programmable interfaces that allow an application to be SSL enabled.">Global Secure ToolKit (GSKit) APIs</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="xgskserver.htm" title="This code example can be used to establish a secure server using Global Secure ToolKit (GSKit) APIs.">Example: GSKit secure server with asynchronous data receive</a></div>
<div><a href="xgskclient.htm" title="This code sample provides an example of a client that uses the GSKit APIs.">Example: Establish a secure client with Global Secure ToolKit (GSKit) APIs</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="../apis/createiocompletionport.htm">QsoCreateIOCompletionPort()</a></div>
<div><a href="../apis/users_14.htm">pthread_create</a></div>
<div><a href="../apis/waitforiocompletion.htm">QsoWaitForIoCompletionPort()</a></div>
<div><a href="../apis/destroyiocompletionport.htm">QsoDestroyIOCompletionPort()</a></div>
<div><a href="../apis/bind.htm">bind()</a></div>
<div><a href="../apis/socket.htm">socket()</a></div>
<div><a href="../apis/listen.htm">listen()</a></div>
<div><a href="../apis/close.htm">close()</a></div>
<div><a href="../apis/accept.htm">accept()</a></div>
<div><a href="../apis/gsk_environment_open.htm">gsk_environment_open()</a></div>
<div><a href="../apis/gsk_attribute_set_buffer.htm">gsk_attribute_set_buffer</a></div>
<div><a href="../apis/gsk_attribute_set_enum.htm">gsk_attribute_set_enum()</a></div>
<div><a href="../apis/gsk_environment_init.htm">gsk_environment_init()</a></div>
<div><a href="../apis/gsk_secure_soc_open.htm">gsk_secure_soc_open()</a></div>
<div><a href="../apis/gsk_attribute_set_numeric_value.htm">gsk_attribute_set_numeric_value()</a></div>
<div><a href="../apis/gsk_secure_soc_init.htm">gsk_secure_soc_init()</a></div>
<div><a href="../apis/users_25.htm">pthread_join</a></div>
<div><a href="../apis/gsk_secure_soc_close.htm">gsk_secure_soc_close()</a></div>
<div><a href="../apis/gsk_environment_close.htm">gsk_environment_close()</a></div>
<div><a href="../apis/gsk_attribute_get_numeric_value.htm">gsk_attribute_get_numeric_value()</a></div>
<div><a href="../apis/gsk_secure_soc_write.htm">gsk_secure_soc_write()</a></div>
<div><a href="../apis/gskstartinit.htm">gsk_secure_soc_startInit()</a></div>
<div><a href="../apis/gsk_secure_soc_read.htm">gsk_secure_soc_read()</a></div>
</div>
</div>
</body>
</html>
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