cgi_process_data

#include <net_config.h>

void cgi_process_data (
    U8  code,     /* Type of data in received data buffer. */
    U8* dat,      /* Pointer to the data string from the POST method. */
    U16 len );    /* Number of bytes in the data string. */

The cgi_process_data function processes the data returned from the CGI form POST method. The HTTP server calls this function when a user presses the SUBMIT button on the input form, using a web browser.

The cgi_process_data function is part of RL-TCPnet. The prototype is defined in net_config.h. You can customize the function in http_cgi.c.

note

• The HTTP server calls the cgi_process_data function only if the input form, in HTML source, is created with the attribute METHOD=POST. For example:

  <FORM ACTION=index.htm METHOD=POST NAME=CGI>
   .
   .
  </FORM>
  

• Web browsers provide a filename for HTTP file upload with path included. It is a user responsibility to remove path information from the filename.
• For large files, file data is received in several small packets. The size of data packet depends on the TCP Maximum Segment Size. MSS value is typically 1460 bytes.

void cgi_process_data (U8 code, U8 *dat, U16 len) {
   U8 passw[12], retyped[12];
   U8 var[40], stpassw;

   switch (code) {
      case 0:
         /* Url encoded form data received. */
         break;

      case 1:
         /* Filename for file upload received as encoded by the browser. */
         /* It might contain an absolute path to a file from the sending */
         /* host. Open a file for writing. */
         return;

      case 2:
         /* File content data received. Write data to a file. */
         /* This function will be called several times with   */
         /* code 2 when a big file is being uploaded.         */
         return;

      case 3:
         /* File upload finished. Close a file. */
         return;

      default:
         return;
   }

   if (len == 0) {
      /* No data, or all items (radio, checkbox) are off. */
      return;
   }
   stpassw = 0;
   do {
      /* Parse all returned parameters. */
      dat = http_get_var (dat, var, 40);
      if (var[0] != 0) {
         /* Parameter found, returned string is non 0-length. */
         if (str_scomp (var, "pw=") == __TRUE) {
            /* Change password. */
            str_copy (passw, var+3);
            stpassw |= 1;
         }
         else if (str_scomp (var, "pw2=") == __TRUE) {
            /* Retyped password. */
            str_copy (retyped, var+4);
            stpassw |= 2;
         }
      }
   }while (dat);
   if (stpassw == 0x03) {
      len = strlen (passw);
      if (mem_comp (passw, retyped, len) == __TRUE) {
         /* OK, both entered passwords the same, change it. */
         str_copy (http_auth_passw, passw);
      }
   }
}