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<h1 class="topictitle1">Example: GSKit secure server with asynchronous data receive</h1>
<div><p>This code example can be used to establish a secure server using
Global Secure ToolKit (GSKit) APIs.</p>
<div class="section"><p>The server opens the socket, prepares the secure environment,
accepts and processes connection requests, exchanges data with the client
and ends the session. The client also opens a socket, sets up the secure environment,
calls the server and requests a secure connection, exchanges data with the
server, and closes the session. The following diagram and description shows
the server/client flow of events.</p>
<div class="note"><span class="notetitle">Note:</span> The following example programs
use AF_INET address family, but they can be modified to also use the AF_INET6
address family.</div>
</div>
<div class="section"><h4 class="sectiontitle">Socket flow of events: Secure server that uses asynchronous
data receive</h4><p><br /><img src="rzab6512.gif" alt="GSKit secure server that uses asynchronous data receive" /><br /></p>
</div>
<div class="section"><p>The following sequence of the socket calls provides
a description of the graphic. It also describes the relationship between the
server and client examples.</p>
</div>
<div class="section"> <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 receive data and to echo it back to the client. 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>A call to <span class="apiname">gsk_secure_soc_init()</span> to initiate the SSL
handshake negotiation of the cryptographic parameters. <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 to which the client is
connecting 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">gsk_secure_soc_startRecv()</span> function initiates an
asynchronous receive operation on a secure session. </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, and 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 uses GSKit APIs</h4><ol><li>After the server application creates a worker thread, it waits for server
to send it the incoming client request to process client data with the <span class="apiname">gsk_secure_soc_startRecv()</span> call.
The <span class="apiname">QsoWaitForIOCompletionPort()</span> function waits on the
supplied IO completion port that was specified by the server.</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_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*/
/* "IBM grants you a nonexclusive copyright license */
/* to use all programming code examples from which */
/* you can generate similar function tailored to your */
/* own specific needs. */
/* */
/* All sample code is provided by IBM for illustrative*/
/* purposes only. These examples have not been */
/* thoroughly tested under all conditions. IBM, */
/* therefore, cannot guarantee or imply reliability, */
/* serviceability, or function of these programs. */
/* */
/* All programs contained herein are provided to you */
/* "AS IS" without any warranties of any kind. The */
/* implied warranties of non-infringement, */
/* merchantability and fitness for a particular */
/* purpose are expressly disclaimed. " */
/* 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(PROG/GSKSERVa) */
/* SRCFILE(PROG/CSRC) */
/* SRCMBR(GSKSERVa) */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <gskssl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#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 = -1, ioCompPort = -1;
int successFlag = FALSE;
char buff[1024];
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()) < 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(&thr, NULL, workerThread, &ioCompPort);
if (rc < 0)
{
perror("pthread_create() failed");
break;
}
/* open a gsk environment */
rc = errno = 0;
rc = gsk_environment_open(&my_env_handle);
if (rc != GSK_OK)
{
printf("gsk_environment_open() failed with rc = %d & 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 & 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 & 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 & 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 & errno = %d.\n"
,rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/* Initialize the secure environment */
rc = errno = 0;
rc = gsk_environment_init(my_env_handle);
if (rc != GSK_OK)
{
printf("gsk_environment_init() failed with rc = %d & 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 */
lsd = socket(AF_INET, SOCK_STREAM, 0);
if (lsd < 0)
{
perror("socket() failed");
break;
}
/* set socket so can be reused immediately */
rc = setsockopt(lsd, SOL_SOCKET,
SO_REUSEADDR,
(char *)&on,
sizeof(on));
if (rc < 0)
{
perror("setsockopt() failed");
break;
}
/* bind to the local server address */
memset((char *) &address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_port = 13333;
address.sin_addr.s_addr = 0;
rc = bind(lsd, (struct sockaddr *) &address, sizeof(address));
if (rc < 0)
{
perror("bind() failed");
break;
}
/* enable the socket for incoming client connections */
listen(lsd, 5);
if (rc < 0)
{
perror("listen() failed");
break;
}
/* accept an incoming client connection */
al = sizeof(address);
sd = accept(lsd, (struct sockaddr *) &address, &al);
if (sd < 0)
{
perror("accept() failed");
break;
}
/* open a secure session */
rc = errno = 0;
rc = gsk_secure_soc_open(my_env_handle, &my_session_handle);
if (rc != GSK_OK)
{
printf("gsk_secure_soc_open() failed with rc = %d & 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;
}
/* initiate the SSL handshake */
rc = errno = 0;
rc = gsk_secure_soc_init(my_session_handle);
if (rc != GSK_OK)
{
printf("gsk_secure_soc_init() failed with rc = %d & errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/*********************************************/
/* Issue gsk_secure_soc_startRecv() to */
/* receive client request. */
/* Note: */
/* postFlag == on denoting request should */
/* posted to the I/O completion port, even */
/* if request is immediately available. */
/* Worker thread will process client request.*/
/*********************************************/
/*********************************************/
/* initialize Qso_OverlappedIO_t structure - */
/* reserved fields must be hex 00's. */
/*********************************************/
memset(&ioStruct, '\0', sizeof(ioStruct));
memset((char *) buff, 0, sizeof(buff));
ioStruct.buffer = buff;
ioStruct.bufferLength = sizeof(buff);
/*********************************************/
/* 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;
ioStruct.postFlag = 1;
ioStruct.fillBuffer = 0;
rc = gsk_secure_soc_startRecv(my_session_handle,
ioCompPort,
&ioStruct);
if (rc != GSK_AS400_ASYNCHRONOUS_RECV)
{
printf("gsk_secure_soc_startRecv() rc = %d & errno = %d.\n",rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
break;
}
/*********************************************/
/* 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, &status);
/* check status of the worker */
if ( rc == 0 && (rc = __INT(status)) == Success)
{
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(&my_session_handle);
/* disable the SSL environment */
if (my_env_handle != NULL)
gsk_environment_close(&my_env_handle);
/* close the listening socket */
if (lsd > -1)
close(lsd);
/* close the accepted socket */
if (sd > -1)
close(sd);
/* destroy the completion port */
if (ioCompPort > -1)
QsoDestroyIOCompletionPort(ioCompPort);
if (successFlag)
exit(0);
else
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 = -1, clientfd = -1;
Qso_OverlappedIO_t ioStruct;
int rc, tID;
int amtWritten;
gsk_handle client_session_handle = NULL;
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 a client request. */
/*********************************************/
waitTime.tv_sec = 500;
waitTime.tv_usec = 0;
rc = QsoWaitForIOCompletion(ioCompPort, &ioStruct, &waitTime);
if ((rc == 1) &&
(ioStruct.returnValue == GSK_OK) &&
(ioStruct.operationCompleted == GSKSECURESOCSTARTRECV))
/*********************************************/
/* Client request has been received. */
/*********************************************/
;
else
{
perror("QsoWaitForIOCompletion()/gsk_secure_soc_startRecv() failed");
printf("ioStruct.returnValue = %d.\n", ioStruct.returnValue);
return __VOID(Failure);
}
/* write results to screen */
printf("gsk_secure_soc_startRecv() received %d bytes, here they are:\n",
ioStruct.secureDataTransferSize);
printf("%s\n",ioStruct.buffer);
/*********************************************/
/* 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;
rc = gsk_attribute_get_numeric_value(client_session_handle,
GSK_FD,
&clientfd);
if (rc != GSK_OK)
{
printf("gsk_attribute_get_numeric_value() rc = %d & errno = %d.\n",
rc,errno);
printf("rc of %d means %s\n", rc, gsk_strerror(rc));
return __VOID(Failure);
}
/* send the message to the client using the secure session */
amtWritten = 0;
rc = gsk_secure_soc_write(client_session_handle,
ioStruct.buffer,
ioStruct.secureDataTransferSize,
&amtWritten);
if (amtWritten != ioStruct.secureDataTransferSize)
{
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",ioStruct.buffer);
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="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><a href="xgskasynch.htm" title="The gsk_secure_soc_startInit() API allows you to create secure server applications that can handle request asynchronously.">Example: GSKit secure server with asynchronous handshake</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/gskstartrecv.htm">gsk_secure_soc_startRecv()</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>
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