how to use the GET and POST methods more than once in a C++ embedded server

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HI,

I've developed en embedded web-server using Snorkel API, where the server displays a form requesting the mobile number from the client using the GET and POST method via index.html.
The problem is after posting the mobile number, I need another form requesting the client to submit a One-Time-Password by also using the GET and POST, but its not working.

HERE, ARE THE TWO REQUIRED FORMS:

C++

/*Overloading a form URL and its corresponding POST*/

char szForm[] =        /*content buffer-containing form*/
  { "<html>\r\n<body>\r\n"
	"<form method=\"post\" action=\"postform.html\">\r\n"
	"Mobile Number:\r\n"
	"<input type=\"text\" name=\"mobilenumber\">\r\n"
	"<br>\r\n"
	"<input type=\"submit\" value=\"submit\">\r\n"
	"</form>\r\n" "</body>\r\n</html>\r\n"
  };

  char otpForm[] =
  { "<html>\r\n<body>\r\n"
	"<form method=\"post\" action=\"postform.html\">\r\n"
	"One Time Password:\r\n"
	"<input type=\"text\" name=\"otp\">\r\n"
	"<br>\r\n"
	"<input type=\"submit\" value=\"submit\">\r\n"
	"</form>\r\n" "</body>\r\n</html>\r\n"
  };

HERE, IS THE POSTFORM FUNCTION:

C++

<pre>call_status_t
postform (snorkel_obj_t http,    //read environment from this object
		  snorkel_obj_t outstream)       // write data to the output stream

  {
   if (snorkel_obj_get(http, snorkel_attrib_post, "mobilenumber", szmobilenumber,sizeof (szmobilenumber)) != SNORKEL_SUCCESS)
		  return HTTP_ERROR;

   snorkel_printf (outstream,"<html><body>YOUR MOBILE NUMBER IS %s </body></html>", szmobilenumber);

}

C++

void main (int argc, char *argv[])
   {
	 int i = 1;
	 int port = 8080;
	 char *pszIndex = 0;
	 char *pszLog = 0;
	 char szExit[10];
	 snorkel_obj_t logobj = 0;
	 snorkel_obj_t http = 0;
	 snorkel_obj_t outstream;
	 int has_ssl=0;

	 for (; i < argc; i++)
	 {
	  if (argv[i][0] == '-' || argv[i][0] == '/')
		{
		  char carg = argv[i][1];

		  switch (carg)
		   {
			case 'p':
			 port = atoi (argv[i + 1]);
			 i++;
			 break;

			case 'l':
			 pszLog = argv[i + 1];
			  i++;
			  break;

			 default:
			  syntax (argv[0]);
			  break;
			}
		 }
	 }
/*
 *
 * create a log file object
 * for logging
 *
 */

 if (pszLog)
  {
   logobj = snorkel_obj_create (snorkel_obj_log, pszLog);
   if (!logobj)
	 {
	   perror ("could not create log file\n");
	   exit (1);
	  }
	snorkel_debug (1);
   }

/*
 *
 * initialize the API
 *
 */
if (snorkel_init () != SNORKEL_SUCCESS)
 {
   perror ("could not initialize snorkel\n");
   exit (1);
 }

/*
 *
 * create our server object
 *
 */
http = snorkel_obj_create (snorkel_obj_server, 4, NULL);
if (!http)
  {
	perror ("could not create http server\n");
	exit (1);
  }

/*
 *
 * set up our listener
 *
 */

 // practice
 //if (snorkel_sysenable_ssl("/Users/Rania/Documents/DIGITAL CERTIFICATES/MServer.pem")==SNORKEL_SUCCESS)
 has_ssl=0;

 if (snorkel_obj_set (http,snorkel_attrib_listener,port, has_ssl) != SNORKEL_SUCCESS)
	{
	  perror ("could not establish listener\n");
	  snorkel_obj_destroy (http);
	  if (logobj)
		 snorkel_obj_destroy (logobj);
	  exit (1);
	 }

 if (snorkel_obj_set(http, snorkel_attrib_ipvers, IPVERS_IPV4,SOCK_SET) != SNORKEL_SUCCESS)
	{
	  fprintf (stderr, "error could not set ip version\n");
	  exit (1);
	 }

  //LISTENING ON ANOTHER PORT
  //-------------------------
  if (snorkel_obj_set (http,snorkel_attrib_listener,7021, 0) != SNORKEL_SUCCESS)
	{
	  perror ("could not establish listener\n");
	  snorkel_obj_destroy (http);
	  if (logobj)
		 snorkel_obj_destroy (logobj);
	  exit (1);
	 }
/*
 *
 * overload some URLs
 *
 */


 if (snorkel_obj_set (http, snorkel_attrib_uri_content, GET,   /* method */
					  "/index.html",   /* URL to overload */
					   szForm,  /* pointer to content buffer */
					   SNORKEL_STORE_AS_REF     /* do not duplicate */
  ) != SNORKEL_SUCCESS)
	{
		perror ("could not overload index.html");
		snorkel_obj_destroy (http);
		if (logobj)
		  snorkel_obj_destroy (logobj);
		exit (1);
	 }

  if (snorkel_obj_set (http,snorkel_attrib_uri, POST,"/postform.html",contenttype_text,postform) != SNORKEL_SUCCESS)
	{
	  perror ("could not overload postform.html");
	  snorkel_obj_destroy (http);
	  if (logobj)
		snorkel_obj_destroy (logobj);
	  exit (1);
	 }
<pre lang="c++">if (snorkel_obj_set (http, snorkel_attrib_uri_content, GET,   /* method */
					  "/index.html",   /* URL to overload */
					   otpForm,  /* pointer to content buffer */
					   SNORKEL_STORE_AS_REF     /* do not duplicate */
  ) != SNORKEL_SUCCESS)
	{
		perror ("could not overload index.html");
		snorkel_obj_destroy (http);
		if (logobj)
		  snorkel_obj_destroy (logobj);
		exit (1);
	 }

fprintf (stderr,"\n\n[HTTP] starting on port %d....", port);

if (pszLog)
{
fprintf (stderr,"\n[HTTP] logging messages to %s\n", pszLog);
}
if (snorkel_obj_start (http) != SNORKEL_SUCCESS)
{
perror ("could not start server\n");
snorkel_obj_destroy (http);
if (logobj)
snorkel_obj_destroy (logobj);
exit (1);
}

C++

fprintf (stderr, "\n[HTTP] started.\n\n"
				"--hit enter to terminate--\n");
 fgets (szExit, sizeof (szExit), stdin);


 //fprintf (stderr, "[HTTP] bye\n");
 /*snorkel_obj_destroy (http);
 if (logobj)
	snorkel_obj_destroy (logobj);
   getch();

}

my question is: how can I display the first form szForm (the form requesting the mobile number), and after submitting the mobile number, I get the second form otpForm (the form that request the OTP)!!
Another question:
can we perform the second GET method on the same index.html, which I've used with my first GET method?

Need help please.

Best Regards.

Posted 2-Dec-15 13:52pm

raniam

Updated 2-Dec-15 17:52pm

Mohibur Rashid

v2

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