/* httpd-cgi.c
 * 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.
 */

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>

#include <net/uip/uip.h>
#include <net/uip/httpd.h>

#include "httpd-cgi.h"

#define CONFIG_HTTPDCGI_FILESTATS 1
#undef CONFIG_HTTPDCGI_DCPSTATS
#define CONFIG_HTTPDCGI_NETSTATS 1

HTTPD_CGI_CALL(file, "file-stats", file_stats);
#if CONFIG_HTTPDCGI_TCPSTATS
HTTPD_CGI_CALL(tcp, "tcp-connections", tcp_stats);
#endif
HTTPD_CGI_CALL(net, "net-stats", net_stats);

#if 0 /* Revisit */
static const struct httpd_cgi_call *calls[] = { &file, &tcp, &net, NULL };
#else
static const struct httpd_cgi_call *calls[] = {

#ifdef CONFIG_HTTPDCGI_FILESTATS
  &file,
#endif
#ifdef CONFIG_HTTPDCGI_DCPSTATS
  &tcp,
#endif
#ifdef CONFIG_HTTPDCGI_NETSTATS
  &net,
#endif
  NULL
};
#endif

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};

#if CONFIG_HTTPDCGI_TCPSTATS
static const char *states[] =
{
  closed,
  syn_rcvd,
  syn_sent,
  established,
  fin_wait_1,
  fin_wait_2,
  closing,
  time_wait,
  last_ack
};
#endif

static void nullfunction(struct httpd_state *pstate, char *ptr)
{
}

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;
    }
  }
#warning REVISIT -- must wait to return
  return nullfunction;
}

#ifdef CONFIG_HTTPDCGI_FILESTATS
static void file_stats(struct httpd_state *pstate, char *ptr)
{
  char buffer[16];
  char *pcount = strchr(ptr, ' ') + 1;
  snprintf(buffer, 16, "%5u", httpd_fs_count(pcount));
  (void)send(pstate->sockout, buffer, strlen(buffer), 0);
}
#endif

#if CONFIG_HTTPDCGI_TCPSTATS
static void tcp_stats(struct httpd_state *pstate, char *ptr)
{
  struct uip_conn *conn;
  struct httpd_state *pstate = (struct httpd_state *)arg;
  char buffer[256];

  for(pstate->count = 0; pstate->count < UIP_CONNS; ++pstate->count)
    {
      conn = &uip_conns[pstate->count];
      if((conn->tcpstateflags & UIP_TS_MASK) != UIP_CLOSED)
        {
          snprintf(buffer, 25t,
            "<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))? '!':' ');

          (void)send(pstate->sockout, buffer, strlen(buffer), 0);
        }
    }
}
#endif

#ifdef CONFIG_HTTPDCGI_NETSTATS
static void net_stats(struct httpd_state *pstate, char *ptr)
{
#ifdef CONFIG_NET_STATISTICS
  char buffer[16];

  for(pstate->count = 0; pstate->count < sizeof(uip_stat) / sizeof(uip_stats_t); ++pstate->count)
    {
      snprintf(buffer, 16, "%5u\n", ((uip_stats_t *)&uip_stat)[pstate->count]);
      send(pstate->sockout, buffer, strlen(buffer), 0);
    }
#endif
}
#endif