/* * 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> * *//* This is the part of the API that is linked with   the application */#include "lwip/opt.h"#include "lwip/api.h"#include "lwip/api_msg.h"#include "lwip/memp.h"structnetbuf *netbuf_new(void){  struct netbuf *buf;  buf = memp_malloc(MEMP_NETBUF);  if (buf != NULL) {    buf->p = NULL;    buf->ptr = NULL;    return buf;  } else {    return NULL;  }}voidnetbuf_delete(struct netbuf *buf){  if (buf != NULL) {    if (buf->p != NULL) {      pbuf_free(buf->p);      buf->p = buf->ptr = NULL;    }    memp_free(MEMP_NETBUF, buf);  }}void *netbuf_alloc(struct netbuf *buf, u16_t size){  /* Deallocate any previously allocated memory. */  if (buf->p != NULL) {    pbuf_free(buf->p);  }  buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);  if (buf->p == NULL) {     return NULL;  }  buf->ptr = buf->p;  return buf->p->payload;}voidnetbuf_free(struct netbuf *buf){  if (buf->p != NULL) {    pbuf_free(buf->p);  }  buf->p = buf->ptr = NULL;}voidnetbuf_ref(struct netbuf *buf, void *dataptr, u16_t size){  if (buf->p != NULL) {    pbuf_free(buf->p);  }  buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);  buf->p->payload = dataptr;  buf->p->len = buf->p->tot_len = size;  buf->ptr = buf->p;}voidnetbuf_chain(struct netbuf *head, struct netbuf *tail){  pbuf_chain(head->p, tail->p);  head->ptr = head->p;  memp_free(MEMP_NETBUF, tail);}u16_tnetbuf_len(struct netbuf *buf){  return buf->p->tot_len;}err_tnetbuf_data(struct netbuf *buf, void **dataptr, u16_t *len){  if (buf->ptr == NULL) {    return ERR_BUF;  }  *dataptr = buf->ptr->payload;  *len = buf->ptr->len;  return ERR_OK;}s8_tnetbuf_next(struct netbuf *buf){  if (buf->ptr->next == NULL) {    return -1;  }  buf->ptr = buf->ptr->next;  if (buf->ptr->next == NULL) {    return 1;  }  return 0;}voidnetbuf_first(struct netbuf *buf){  buf->ptr = buf->p;}voidnetbuf_copy_partial(struct netbuf *buf, void *dataptr, u16_t len, u16_t offset){  struct pbuf *p;  u16_t i, left;  left = 0;  if(buf == NULL || dataptr == NULL) {    return;  }    /* This implementation is bad. It should use bcopy     instead. */  for(p = buf->p; left < len && p != NULL; p = p->next) {    if (offset != 0 && offset >= p->len) {      offset -= p->len;    } else {          for(i = offset; i < p->len; ++i) {  ((char *)dataptr)[left] = ((char *)p->payload)[i];  if (++left >= len) {    return;  }      }      offset = 0;    }  }}voidnetbuf_copy(struct netbuf *buf, void *dataptr, u16_t len){  netbuf_copy_partial(buf, dataptr, len, 0);}struct ip_addr *netbuf_fromaddr(struct netbuf *buf){  return buf->fromaddr;}u16_tnetbuf_fromport(struct netbuf *buf){  return buf->fromport;}structnetconn *netconn_new_with_proto_and_callback(enum netconn_type t, u16_t proto,                                   void (*callback)(struct netconn *, enum netconn_evt, u16_t len)){  struct netconn *conn;  struct api_msg *msg;  conn = memp_malloc(MEMP_NETCONN);  if (conn == NULL) {    return NULL;  }    conn->err = ERR_OK;  conn->type = t;  conn->pcb.tcp = NULL;  if ((conn->mbox = sys_mbox_new()) == SYS_MBOX_NULL) {    memp_free(MEMP_NETCONN, conn);    return NULL;  }  conn->recvmbox = SYS_MBOX_NULL;  conn->acceptmbox = SYS_MBOX_NULL;  conn->sem = SYS_SEM_NULL;  conn->state = NETCONN_NONE;  conn->socket = 0;  conn->callback = callback;  conn->recv_avail = 0;  if((msg = memp_malloc(MEMP_API_MSG)) == NULL) {    memp_free(MEMP_NETCONN, conn);    return NULL;  }    msg->type = API_MSG_NEWCONN;  msg->msg.msg.bc.port = proto; /* misusing the port field */  msg->msg.conn = conn;  api_msg_post(msg);    sys_mbox_fetch(conn->mbox, NULL);  memp_free(MEMP_API_MSG, msg);  if ( conn->err != ERR_OK ) {    memp_free(MEMP_NETCONN, conn);    return NULL;  }  return conn;}structnetconn *netconn_new(enum netconn_type t){  return netconn_new_with_proto_and_callback(t,0,NULL);}structnetconn *netconn_new_with_callback(enum netconn_type t,                                   void (*callback)(struct netconn *, enum netconn_evt, u16_t len)){  return netconn_new_with_proto_and_callback(t,0,callback);}err_tnetconn_delete(struct netconn *conn){  struct api_msg *msg;  void *mem;    if (conn == NULL) {    return ERR_OK;  }    if ((msg = memp_malloc(MEMP_API_MSG)) == NULL) {    return ERR_MEM;  }    msg->type = API_MSG_DELCONN;  msg->msg.conn = conn;  api_msg_post(msg);    sys_mbox_fetch(conn->mbox, NULL);  memp_free(MEMP_API_MSG, msg);  /* Drain the recvmbox. */  if (conn->recvmbox != SYS_MBOX_NULL) {    while (sys_arch_mbox_fetch(conn->recvmbox, &mem, 1) != SYS_ARCH_TIMEOUT) {      if (conn->type == NETCONN_TCP) {        if(mem != NULL)          pbuf_free((struct pbuf *)mem);      } else {        netbuf_delete((struct netbuf *)mem);      }    }    sys_mbox_free(conn->recvmbox);    conn->recvmbox = SYS_MBOX_NULL;  }   /* Drain the acceptmbox. */  if (conn->acceptmbox != SYS_MBOX_NULL) {    while (sys_arch_mbox_fetch(conn->acceptmbox, &mem, 1) != SYS_ARCH_TIMEOUT) {      netconn_delete((struct netconn *)mem);    }        sys_mbox_free(conn->acceptmbox);    conn->acceptmbox = SYS_MBOX_NULL;  }  sys_mbox_free(conn->mbox);  conn->mbox = SYS_MBOX_NULL;  if (conn->sem != SYS_SEM_NULL) {    sys_sem_free(conn->sem);  }  /*  conn->sem = SYS_SEM_NULL;*/  memp_free(MEMP_NETCONN, conn);  return ERR_OK;}enum netconn_typenetconn_type(struct netconn *conn){  return conn->type;}err_tnetconn_peer(struct netconn *conn, struct ip_addr *addr,       u16_t *port){  switch (conn->type) {  case NETCONN_RAW:    /* return an error as connecting is only a helper for upper layers */    return ERR_CONN;  case NETCONN_UDPLITE:  case NETCONN_UDPNOCHKSUM:  case NETCONN_UDP:    if (conn->pcb.udp == NULL ||  ((conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0))     return ERR_CONN;    *addr = (conn->pcb.udp->remote_ip);    *port = conn->pcb.udp->remote_port;    break;  case NETCONN_TCP:    if (conn->pcb.tcp == NULL)      return ERR_CONN;    *addr = (conn->pcb.tcp->remote_ip);    *port = conn->pcb.tcp->remote_port;    break;  }  return (conn->err = ERR_OK);}err_tnetconn_addr(struct netconn *conn, struct ip_addr **addr,       u16_t *port){  switch (conn->type) {  case NETCONN_RAW:    *addr = &(conn->pcb.raw->local_ip);    *port = conn->pcb.raw->protocol;    break;  case NETCONN_UDPLITE:  case NETCONN_UDPNOCHKSUM:  case NETCONN_UDP:    *addr = &(conn->pcb.udp->local_ip);    *port = conn->pcb.udp->local_port;    break;  case NETCONN_TCP:    *addr = &(conn->pcb.tcp->local_ip);    *port = conn->pcb.tcp->local_port;    break;