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/**

 * \addtogroup httpd

 * @{

 */

/**

 * \file

 *         Web server script interface

 * \author

 *         Adam Dunkels <adam@sics.se>

 *

 */

/*

 * Copyright (c) 2001-2006, 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: httpd-cgi.c 2 2011-07-17 20:13:17Z filepang@gmail.com $

 *

 */

#include "uip.h"

#include "psock.h"

#include "httpd.h"

#include "httpd-cgi.h"

#include "httpd-fs.h"

#include <stdio.h>

#include <string.h>

HTTPD_CGI_CALL(file, "file-stats", file_stats);

HTTPD_CGI_CALL(tcp, "tcp-connections", tcp_stats);

HTTPD_CGI_CALL(net, "net-stats", net_stats);

static const struct httpd_cgi_call *calls[] = { &file, &tcp, &net, NULL };

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

static

PT_THREAD(nullfunction(struct httpd_state *s, char *ptr))

{

  PSOCK_BEGIN(&s->sout);

  PSOCK_END(&s->sout);

}

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

httpd_cgifunction

httpd_cgi(char *name)

{

  const struct httpd_cgi_call **f;

  /* Find the matching name in the table, return the function. */

  for(f = calls; *f != NULL; ++f) {

    if(strncmp((*f)->name, name, strlen((*f)->name)) == 0) {

      return (*f)->function;

    }

  }

  return nullfunction;

}

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

static unsigned short

generate_file_stats(void *arg)

{

  char *f = (char *)arg;

  return snprintf((char *)uip_appdata, UIP_APPDATA_SIZE, "%5u", httpd_fs_count(f));

}

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

static

PT_THREAD(file_stats(struct httpd_state *s, char *ptr))

{

  PSOCK_BEGIN(&s->sout);

  PSOCK_GENERATOR_SEND(&s->sout, generate_file_stats, strchr(ptr, ' ') + 1);

  PSOCK_END(&s->sout);

}

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

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};

static unsigned short

generate_tcp_stats(void *arg)

{

  struct uip_conn *conn;

  struct httpd_state *s = (struct httpd_state *)arg;

  conn = &uip_conns[s->count];

  return snprintf((char *)uip_appdata, UIP_APPDATA_SIZE,

                 "<tr><td>%d</td><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->lport),

                 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 & UIP_TS_MASK],

                 conn->nrtx,

                 conn->timer,

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

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

}

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

static

PT_THREAD(tcp_stats(struct httpd_state *s, char *ptr))

{

  PSOCK_BEGIN(&s->sout);

  for(s->count = 0; s->count < UIP_CONNS; ++s->count) {

    if((uip_conns[s->count].tcpstateflags & UIP_TS_MASK) != UIP_CLOSED) {

      PSOCK_GENERATOR_SEND(&s->sout, generate_tcp_stats, s);

    }

  }

  PSOCK_END(&s->sout);

}

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

static unsigned short

generate_net_stats(void *arg)

{

  struct httpd_state *s = (struct httpd_state *)arg;

  return snprintf((char *)uip_appdata, UIP_APPDATA_SIZE,

                  "%5u\n", ((uip_stats_t *)&uip_stat)[s->count]);

}

static

PT_THREAD(net_stats(struct httpd_state *s, char *ptr))

{

  PSOCK_BEGIN(&s->sout);

#if UIP_STATISTICS

  for(s->count = 0; s->count < sizeof(uip_stat) / sizeof(uip_stats_t);

      ++s->count) {

    PSOCK_GENERATOR_SEND(&s->sout, generate_net_stats, s);

  }

#endif /* UIP_STATISTICS */

  PSOCK_END(&s->sout);

}

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

/** @} */