/*
 * Copyright (c) 2007, Swedish Institute of Computer Science.
 * 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
 * 
 * Author: Oliver Schmidt <ol.sc@web.de>
 *
 * $Id: wpcap-service.c,v 1.1 2007/09/05 16:11:08 oliverschmidt Exp $
 */

#include <memory.h>

#include "packet-service.h"
#include "uip_arp.h"
#include "wpcap.h"

static void output(u8_t *hdr, u16_t hdrlen, u8_t *data, u16_t datalen);

static struct packet_service_state
state = {PACKET_SERVICE_VERSION, output};

EK_EVENTHANDLER(eventhandler, ev, data);
EK_POLLHANDLER(pollhandler);
EK_PROCESS(proc, PACKET_SERVICE_NAME, EK_PRIO_NORMAL,
	   eventhandler, pollhandler, &state);

/*---------------------------------------------------------------------------*/
static void
output(u8_t *hdr, u16_t hdrlen, u8_t *data, u16_t datalen)
{
  /* Just copy all data into uip_buf. */
  memcpy(hdr + hdrlen, data, datalen);
  uip_arp_out();
  wpcap_send();
}
/*---------------------------------------------------------------------------*/
EK_PROCESS_INIT(packet_service_init, arg)
{
  ek_service_start(PACKET_SERVICE_NAME, &proc);
}
/*---------------------------------------------------------------------------*/
EK_EVENTHANDLER(eventhandler, ev, data)
{
  switch(ev) {
  case EK_EVENT_INIT:
  case EK_EVENT_REPLACE:
    wpcap_init();
    break;
  case EK_EVENT_REQUEST_REPLACE:
    ek_replace(data, NULL);
    LOADER_UNLOAD();
    break;
  case EK_EVENT_REQUEST_EXIT:
    wpcap_exit();
    ek_exit();
    LOADER_UNLOAD();
    break;
  default:
    break;
  }
}
/*---------------------------------------------------------------------------*/
EK_POLLHANDLER(pollhandler)
{
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
  
  /* Poll Ethernet device to see if there is a frame avaliable. */
  uip_len = wpcap_poll();
  if(uip_len > 0) {
    /* A frame was avaliable (and is now read into the uip_buf), so
       we process it. */
    if(BUF->type == HTONS(UIP_ETHTYPE_IP)) {
      uip_arp_ipin();
      uip_len -= sizeof(struct uip_eth_hdr);
      tcpip_input();
    } else if(BUF->type == HTONS(UIP_ETHTYPE_ARP)) {
      uip_arp_arpin();
      /* If the above function invocation resulted in data that
         should be sent out on the network, the global variable
         uip_len is set to a value > 0. */
      if(uip_len > 0) {
        wpcap_send();
      }
    }
  }
}
/*---------------------------------------------------------------------------*/