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/*

 * Copyright (c) 2001-2004 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. 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 lwIP TCP/IP stack.

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

#ifndef __LWIP_API_MSG_H__

#define __LWIP_API_MSG_H__

#include "lwip/opt.h"

#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */

#include "lwip/ip_addr.h"

#include "lwip/err.h"

#include "lwip/sys.h"

#include "lwip/igmp.h"

#include "lwip/api.h"

#ifdef __cplusplus

extern "C" {

#endif

/* IP addresses and port numbers are expected to be in

 * the same byte order as in the corresponding pcb.

 */

/** This struct includes everything that is necessary to execute a function

    for a netconn in another thread context (mainly used to process netconns

    in the tcpip_thread context to be thread safe). */

struct api_msg_msg {

  /** The netconn which to process - always needed: it includes the semaphore

      which is used to block the application thread until the function finished. */

  struct netconn *conn;

  /** Depending on the executed function, one of these union members is used */

  union {

    /** used for do_send */

    struct netbuf *b;

    /** used for do_newconn */

    struct {

      u8_t proto;

    } n;

    /** used for do_bind and do_connect */

    struct {

      struct ip_addr *ipaddr;

      u16_t port;

    } bc;

    /** used for do_getaddr */

    struct {

      struct ip_addr *ipaddr;

      u16_t *port;

      u8_t local;

    } ad;

    /** used for do_write */

    struct {

      const void *dataptr;

      int len;

      u8_t apiflags;

    } w;

    /** used ofr do_recv */

    struct {

      u16_t len;

    } r;

#if LWIP_IGMP

    /** used for do_join_leave_group */

    struct {

      struct ip_addr *multiaddr;

      struct ip_addr *interface;

      enum netconn_igmp join_or_leave;

    } jl;

#endif /* LWIP_IGMP */

#if TCP_LISTEN_BACKLOG

    struct {

      u8_t backlog;

    } lb;

#endif /* TCP_LISTEN_BACKLOG */

  } msg;

};

/** This struct contains a function to execute in another thread context and

    a struct api_msg_msg that serves as an argument for this function.

    This is passed to tcpip_apimsg to execute functions in tcpip_thread context. */

struct api_msg {

  /** function to execute in tcpip_thread context */

  void (* function)(struct api_msg_msg *msg);

  /** arguments for this function */

  struct api_msg_msg msg;

};

#if LWIP_DNS

/** As do_gethostbyname requires more arguments but doesn't require a netconn,

    it has its own struct (to avoid struct api_msg getting bigger than necessary).

    do_gethostbyname must be called using tcpip_callback instead of tcpip_apimsg

    (see netconn_gethostbyname). */

struct dns_api_msg {

  /** Hostname to query or dotted IP address string */

  const char *name;

  /** Rhe resolved address is stored here */

  struct ip_addr *addr;

  /** This semaphore is posted when the name is resolved, the application thread

      should wait on it. */

  sys_sem_t sem;

  /** Errors are given back here */

  err_t *err;

};

#endif /* LWIP_DNS */

void do_newconn         ( struct api_msg_msg *msg);

void do_delconn         ( struct api_msg_msg *msg);

void do_bind            ( struct api_msg_msg *msg);

void do_connect         ( struct api_msg_msg *msg);

void do_disconnect      ( struct api_msg_msg *msg);

void do_listen          ( struct api_msg_msg *msg);

void do_send            ( struct api_msg_msg *msg);

void do_recv            ( struct api_msg_msg *msg);

void do_write           ( struct api_msg_msg *msg);

void do_getaddr         ( struct api_msg_msg *msg);

void do_close           ( struct api_msg_msg *msg);

#if LWIP_IGMP

void do_join_leave_group( struct api_msg_msg *msg);

#endif /* LWIP_IGMP */

#if LWIP_DNS

void do_gethostbyname(void *arg);

#endif /* LWIP_DNS */

struct netconn* netconn_alloc(enum netconn_type t, netconn_callback callback);

void netconn_free(struct netconn *conn);

#ifdef __cplusplus

}

#endif

#endif /* LWIP_NETCONN */

#endif /* __LWIP_API_MSG_H__ */