/**
 * @file
 * Application layered TCP connection API (to be used from TCPIP thread)\n
 * This interface mimics the tcp callback API to the application while preventing
 * direct linking (much like virtual functions).
 * This way, an application can make use of other application layer protocols
 * on top of TCP without knowing the details (e.g. TLS, proxy connection).
 */

/*
 * Copyright (c) 2017 Simon Goldschmidt
 * 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: Simon Goldschmidt <goldsimon@gmx.de>
 *
 */
#ifndef LWIP_HDR_ALTCP_PRIV_H
#define LWIP_HDR_ALTCP_PRIV_H

#include "../../lwip/opt.h"

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

#include "../../lwip/altcp.h"
#include "../../lwip/ip_addr.h"

#ifdef __cplusplus
extern "C" {
#endif

struct altcp_pcb *altcp_alloc(void);
void altcp_free(struct altcp_pcb *conn);

/* Function prototypes for application layers */
typedef void (*altcp_set_poll_fn)(struct altcp_pcb *conn, u8_t interval);
typedef void (*altcp_recved_fn)(struct altcp_pcb *conn, u16_t len);
typedef err_t (*altcp_bind_fn)(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port);
typedef err_t (*altcp_connect_fn)(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port, altcp_connected_fn connected);

typedef struct altcp_pcb *(*altcp_listen_fn)(struct altcp_pcb *conn, u8_t backlog, err_t *err);

typedef void  (*altcp_abort_fn)(struct altcp_pcb *conn);
typedef err_t (*altcp_close_fn)(struct altcp_pcb *conn);
typedef err_t (*altcp_shutdown_fn)(struct altcp_pcb *conn, int shut_rx, int shut_tx);

typedef err_t (*altcp_write_fn)(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags);
typedef err_t (*altcp_output_fn)(struct altcp_pcb *conn);

typedef u16_t (*altcp_mss_fn)(struct altcp_pcb *conn);
typedef u16_t (*altcp_sndbuf_fn)(struct altcp_pcb *conn);
typedef u16_t (*altcp_sndqueuelen_fn)(struct altcp_pcb *conn);
typedef void  (*altcp_nagle_disable_fn)(struct altcp_pcb *conn);
typedef void  (*altcp_nagle_enable_fn)(struct altcp_pcb *conn);
typedef int   (*altcp_nagle_disabled_fn)(struct altcp_pcb *conn);

typedef void  (*altcp_setprio_fn)(struct altcp_pcb *conn, u8_t prio);

typedef void  (*altcp_dealloc_fn)(struct altcp_pcb *conn);

typedef err_t (*altcp_get_tcp_addrinfo_fn)(struct altcp_pcb *conn, int local, ip_addr_t *addr, u16_t *port);
typedef ip_addr_t *(*altcp_get_ip_fn)(struct altcp_pcb *conn, int local);
typedef u16_t (*altcp_get_port_fn)(struct altcp_pcb *conn, int local);

#if LWIP_TCP_KEEPALIVE
typedef void  (*altcp_keepalive_disable_fn)(struct altcp_pcb *conn);
typedef void  (*altcp_keepalive_enable_fn)(struct altcp_pcb *conn, u32_t idle, u32_t intvl, u32_t count);
#endif

#ifdef LWIP_DEBUG
typedef enum tcp_state (*altcp_dbg_get_tcp_state_fn)(struct altcp_pcb *conn);
#endif

struct altcp_functions {
  altcp_set_poll_fn           set_poll;
  altcp_recved_fn             recved;
  altcp_bind_fn               bind;
  altcp_connect_fn            connect;
  altcp_listen_fn             listen;
  altcp_abort_fn              abort;
  altcp_close_fn              close;
  altcp_shutdown_fn           shutdown;
  altcp_write_fn              write;
  altcp_output_fn             output;
  altcp_mss_fn                mss;
  altcp_sndbuf_fn             sndbuf;
  altcp_sndqueuelen_fn        sndqueuelen;
  altcp_nagle_disable_fn      nagle_disable;
  altcp_nagle_enable_fn       nagle_enable;
  altcp_nagle_disabled_fn     nagle_disabled;
  altcp_setprio_fn            setprio;
  altcp_dealloc_fn            dealloc;
  altcp_get_tcp_addrinfo_fn   addrinfo;
  altcp_get_ip_fn             getip;
  altcp_get_port_fn           getport;
#if LWIP_TCP_KEEPALIVE
  altcp_keepalive_disable_fn  keepalive_disable;
  altcp_keepalive_enable_fn   keepalive_enable;
#endif
#ifdef LWIP_DEBUG
  altcp_dbg_get_tcp_state_fn  dbg_get_tcp_state;
#endif
};

void  altcp_default_set_poll(struct altcp_pcb *conn, u8_t interval);
void  altcp_default_recved(struct altcp_pcb *conn, u16_t len);
err_t altcp_default_bind(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port);
err_t altcp_default_shutdown(struct altcp_pcb *conn, int shut_rx, int shut_tx);
err_t altcp_default_write(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags);
err_t altcp_default_output(struct altcp_pcb *conn);
u16_t altcp_default_mss(struct altcp_pcb *conn);
u16_t altcp_default_sndbuf(struct altcp_pcb *conn);
u16_t altcp_default_sndqueuelen(struct altcp_pcb *conn);
void  altcp_default_nagle_disable(struct altcp_pcb *conn);
void  altcp_default_nagle_enable(struct altcp_pcb *conn);
int   altcp_default_nagle_disabled(struct altcp_pcb *conn);
void  altcp_default_setprio(struct altcp_pcb *conn, u8_t prio);
void  altcp_default_dealloc(struct altcp_pcb *conn);
err_t altcp_default_get_tcp_addrinfo(struct altcp_pcb *conn, int local, ip_addr_t *addr, u16_t *port);
ip_addr_t *altcp_default_get_ip(struct altcp_pcb *conn, int local);
u16_t altcp_default_get_port(struct altcp_pcb *conn, int local);
#if LWIP_TCP_KEEPALIVE
void  altcp_default_keepalive_disable(struct altcp_pcb *conn);
void  altcp_default_keepalive_enable(struct altcp_pcb *conn, u32_t idle, u32_t intvl, u32_t count);
#endif
#ifdef LWIP_DEBUG
enum tcp_state altcp_default_dbg_get_tcp_state(struct altcp_pcb *conn);
#endif

#ifdef __cplusplus
}
#endif

#endif /* LWIP_ALTCP */

#endif /* LWIP_HDR_ALTCP_PRIV_H */
