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/**

 * \addtogroup httpd

 * @{

 */

/**

 * \file

 * HTTP server script language C functions file.

 * \author Adam Dunkels <adam@dunkels.com>

 *

 * This file contains functions that are called by the web server

 * scripts. The functions takes one argument, and the return value is

 * interpreted as follows. A zero means that the function did not

 * complete and should be invoked for the next packet as well. A

 * non-zero value indicates that the function has completed and that

 * the web server should move along to the next script line.

 *

 */

/*

 * Copyright (c) 2001, Adam Dunkels.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote

 *    products derived from this software without specific prior

 *    written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * This file is part of the uIP TCP/IP stack.

 *

 * $Id: cgi.c 2 2011-07-17 20:13:17Z filepang@gmail.com $

 *

 */

#include "uip.h"

#include "cgi.h"

#include "httpd.h"

#include "fs.h"

#include <stdio.h>

#include <string.h>

static u8_t print_stats(u8_t next);

static u8_t file_stats(u8_t next);

static u8_t tcp_stats(u8_t next);

cgifunction cgitab[] = {

  print_stats,   /* CGI function "a" */

  file_stats,    /* CGI function "b" */

  tcp_stats      /* CGI function "c" */

};

static const char closed[] =   /*  "CLOSED",*/

{0x43, 0x4c, 0x4f, 0x53, 0x45, 0x44, 0};

static const char syn_rcvd[] = /*  "SYN-RCVD",*/

{0x53, 0x59, 0x4e, 0x2d, 0x52, 0x43, 0x56,

 0x44,  0};

static const char syn_sent[] = /*  "SYN-SENT",*/

{0x53, 0x59, 0x4e, 0x2d, 0x53, 0x45, 0x4e,

 0x54,  0};

static const char established[] = /*  "ESTABLISHED",*/

{0x45, 0x53, 0x54, 0x41, 0x42, 0x4c, 0x49, 0x53, 0x48,

 0x45, 0x44, 0};

static const char fin_wait_1[] = /*  "FIN-WAIT-1",*/

{0x46, 0x49, 0x4e, 0x2d, 0x57, 0x41, 0x49,

 0x54, 0x2d, 0x31, 0};

static const char fin_wait_2[] = /*  "FIN-WAIT-2",*/

{0x46, 0x49, 0x4e, 0x2d, 0x57, 0x41, 0x49,

 0x54, 0x2d, 0x32, 0};

static const char closing[] = /*  "CLOSING",*/

{0x43, 0x4c, 0x4f, 0x53, 0x49,

 0x4e, 0x47, 0};

static const char time_wait[] = /*  "TIME-WAIT,"*/

{0x54, 0x49, 0x4d, 0x45, 0x2d, 0x57, 0x41,

 0x49, 0x54, 0};

static const char last_ack[] = /*  "LAST-ACK"*/

{0x4c, 0x41, 0x53, 0x54, 0x2d, 0x41, 0x43,

 0x4b, 0};

static const char *states[] = {

  closed,

  syn_rcvd,

  syn_sent,

  established,

  fin_wait_1,

  fin_wait_2,

  closing,

  time_wait,

  last_ack};

/*-----------------------------------------------------------------------------------*/

/* print_stats:

 *

 * Prints out a part of the uIP statistics. The statistics data is

 * written into the uip_appdata buffer. It overwrites any incoming

 * packet.

 */

static u8_t

print_stats(u8_t next)

{

#if UIP_STATISTICS

  u16_t i, j;

  u8_t *buf;

  u16_t *databytes;

  if(next) {

    /* If our last data has been acknowledged, we move on the next

       chunk of statistics. */

    hs->count = hs->count + 4;

    if(hs->count >= sizeof(struct uip_stats)/sizeof(u16_t)) {

      /* We have printed out all statistics, so we return 1 to

         indicate that we are done. */

      return 1;

    }

  }

  /* Write part of the statistics into the uip_appdata buffer. */

  databytes = (u16_t *)&uip_stat + hs->count;

  buf       = (u8_t *)uip_appdata;

  j = 4 + 1;

  i = hs->count;

  while (i < sizeof(struct uip_stats)/sizeof(u16_t) && --j > 0) {

    sprintf((char *)buf, "%5u\r\n", *databytes);

    ++databytes;

    buf += 6;

    ++i;

  }

  /* Send the data. */

  uip_send(uip_appdata, buf - uip_appdata);

  return 0;

#else

  return 1;

#endif /* UIP_STATISTICS */

}

/*-----------------------------------------------------------------------------------*/

static u8_t

file_stats(u8_t next)

{

  /* We use sprintf() to print the number of file accesses to a

     particular file (given as an argument to the function in the

     script). We then use uip_send() to actually send the data. */

  if(next) {

    return 1;

  }

  uip_send(uip_appdata, sprintf((char *)uip_appdata, "%5u", fs_count(&hs->script[4])));

  return 0;

}

/*-----------------------------------------------------------------------------------*/

static u8_t

tcp_stats(u8_t next)

{

  struct uip_conn *conn;

  if(next) {

    /* If the previously sent data has been acknowledged, we move

       forward one connection. */

    if(++hs->count == UIP_CONNS) {

      /* If all connections has been printed out, we are done and

         return 1. */

      return 1;

    }

  }

  conn = &uip_conns[hs->count];

  if((conn->tcpstateflags & TS_MASK) == CLOSED) {

    uip_send(uip_appdata, sprintf((char *)uip_appdata,

                                  "<tr align=\"center\"><td>-</td><td>-</td><td>%u</td><td>%u</td><td>%c %c</td></tr>\r\n",

                                  conn->nrtx,

                                  conn->timer,

                                  (uip_outstanding(conn))? '*':' ',

                                  (uip_stopped(conn))? '!':' '));

  } else {

    uip_send(uip_appdata, sprintf((char *)uip_appdata,

                                  "<tr align=\"center\"><td>%u.%u.%u.%u:%u</td><td>%s</td><td>%u</td><td>%u</td><td>%c %c</td></tr>\r\n",

                                  htons(conn->ripaddr[0]) >> 8,

                                  htons(conn->ripaddr[0]) & 0xff,

                                  htons(conn->ripaddr[1]) >> 8,

                                  htons(conn->ripaddr[1]) & 0xff,

                                  htons(conn->rport),

                                  states[conn->tcpstateflags & TS_MASK],

                                  conn->nrtx,

                                  conn->timer,

                                  (uip_outstanding(conn))? '*':' ',

                                  (uip_stopped(conn))? '!':' '));

  }

  return 0;

}

/*-----------------------------------------------------------------------------------*/