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441
src/api/sockets.c
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441
src/api/sockets.c
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/*
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* Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/debug.h"
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#include "lwip/api.h"
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#include "lwip/sockets.h"
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#define NUM_SOCKETS 10
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struct lwip_socket {
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struct netconn *conn;
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struct netbuf *lastdata;
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u16_t lastoffset;
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};
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static struct lwip_socket sockets[NUM_SOCKETS];
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/*-----------------------------------------------------------------------------------*/
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static struct lwip_socket *
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get_socket(int s)
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{
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struct lwip_socket *sock;
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if(s > NUM_SOCKETS) {
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/* errno = EBADF; */
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return NULL;
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}
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sock = &sockets[s];
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if(sock->conn == NULL) {
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/* errno = EBADF; */
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return NULL;
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}
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return sock;
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}
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/*-----------------------------------------------------------------------------------*/
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static int
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alloc_socket(struct netconn *newconn)
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{
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int i;
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/* allocate a new socket identifier */
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for(i = 0; i < NUM_SOCKETS; ++i) {
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if(sockets[i].conn == NULL) {
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sockets[i].conn = newconn;
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sockets[i].lastdata = NULL;
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sockets[i].lastoffset = 0;
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return i;
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}
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}
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return -1;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_accept(int s, struct sockaddr *addr, int *addrlen)
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{
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struct lwip_socket *sock;
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struct netconn *newconn;
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struct ip_addr *naddr;
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u16_t port;
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int newsock;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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newconn = netconn_accept(sock->conn);
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/* get the IP address and port of the remote host */
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netconn_peer(newconn, &naddr, &port);
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((struct sockaddr_in *)addr)->sin_addr.s_addr = naddr->addr;
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((struct sockaddr_in *)addr)->sin_port = port;
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newsock = alloc_socket(newconn);
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if(newsock == -1) {
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netconn_delete(newconn);
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/* errno = ENOBUFS; */
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}
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return newsock;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_bind(int s, struct sockaddr *name, int namelen)
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{
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struct lwip_socket *sock;
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struct ip_addr remote_addr;
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u16_t remote_port;
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err_t err;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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remote_addr.addr = ((struct sockaddr_in *)name)->sin_addr.s_addr;
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remote_port = ((struct sockaddr_in *)name)->sin_port;
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err = netconn_bind(sock->conn, &remote_addr, ntohs(remote_port));
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if(err != ERR_OK) {
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/* errno = ... */
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return -1;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_close(int s)
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{
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struct lwip_socket *sock;
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DEBUGF(SOCKETS_DEBUG, ("close: socket %d\n", s));
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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netconn_delete(sock->conn);
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if(sock->lastdata != NULL) {
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netbuf_delete(sock->lastdata);
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}
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sock->lastdata = NULL;
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sock->lastoffset = 0;
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sock->conn = NULL;
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_connect(int s, struct sockaddr *name, int namelen)
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{
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struct lwip_socket *sock;
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struct ip_addr remote_addr;
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u16_t remote_port;
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err_t err;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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remote_addr.addr = ((struct sockaddr_in *)name)->sin_addr.s_addr;
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remote_port = ((struct sockaddr_in *)name)->sin_port;
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err = netconn_connect(sock->conn, &remote_addr, ntohs(remote_port));
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if(err != ERR_OK) {
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/* errno = ... */
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return -1;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_listen(int s, int backlog)
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{
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struct lwip_socket *sock;
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err_t err;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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err = netconn_listen(sock->conn);
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if(err != ERR_OK) {
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/* errno = ... */
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return -1;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_recvfrom(int s, void *mem, int len, unsigned int flags,
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struct sockaddr *from, int *fromlen)
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{
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struct lwip_socket *sock;
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struct netbuf *buf;
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u16_t buflen, copylen;
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struct ip_addr *addr;
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u16_t port;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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/* Check if there is data left from the last recv operation. */
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if(sock->lastdata != NULL) {
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buf = sock->lastdata;
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} else {
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/* No data was left from the previous operation, so we try to get
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some from the network. */
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buf = netconn_recv(sock->conn);
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if(buf == NULL) {
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/* We should really do some error checking here. */
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return 0;
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}
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}
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buflen = netbuf_len(buf);
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buflen -= sock->lastoffset;
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if(len > buflen) {
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copylen = buflen;
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} else {
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copylen = len;
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}
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/* copy the contents of the received buffer into
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the supplied memory pointer mem */
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netbuf_copy_partial(buf, mem, copylen, sock->lastoffset);
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/* If this is a TCP socket, check if there is data left in the
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buffer. If so, it should be saved in the sock structure for next
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time around. */
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if(netconn_type(sock->conn) == NETCONN_TCP && buflen - copylen > 0) {
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sock->lastdata = buf;
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sock->lastoffset += copylen;
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} else {
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sock->lastdata = NULL;
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sock->lastoffset = 0;
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netbuf_delete(buf);
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}
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/* Check to see from where the data was. */
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if(from != NULL && fromlen != NULL) {
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addr = netbuf_fromaddr(buf);
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port = netbuf_fromport(buf);
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((struct sockaddr_in *)from)->sin_addr.s_addr = addr->addr;
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((struct sockaddr_in *)from)->sin_port = port;
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*fromlen = sizeof(struct sockaddr_in);
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}
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/* if the length of the received data is larger than
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len, this data is discarded and we return len.
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otherwise we return the actual length of the received
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data */
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if(len > copylen) {
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return copylen;
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} else {
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return len;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_read(int s, void *mem, int len)
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{
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return lwip_recv(s, mem, len, 0);
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_recv(int s, void *mem, int len, unsigned int flags)
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{
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return lwip_recvfrom(s, mem, len, flags, NULL, NULL);
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_send(int s, void *data, int size, unsigned int flags)
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{
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struct lwip_socket *sock;
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struct netbuf *buf;
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err_t err;
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DEBUGF(SOCKETS_DEBUG, ("send: socket %d, size %d\n", s, size));
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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switch(netconn_type(sock->conn)) {
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case NETCONN_UDP:
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/* create a buffer */
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buf = netbuf_new();
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if(buf == NULL) {
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/* errno = ENOBUFS; */
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return -1;
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}
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/* make the buffer point to the data that should
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be sent */
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netbuf_ref(buf, data, size);
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/* send the data */
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err = netconn_send(sock->conn, buf);
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/* deallocated the buffer */
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netbuf_delete(buf);
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break;
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case NETCONN_TCP:
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err = netconn_write(sock->conn, data, size, NETCONN_COPY);
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break;
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default:
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err = ERR_ARG;
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break;
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}
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if(err != ERR_OK) {
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/* errno = ... */
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return -1;
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}
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return size;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_sendto(int s, void *data, int size, unsigned int flags,
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struct sockaddr *to, int tolen)
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{
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struct lwip_socket *sock;
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struct ip_addr remote_addr, *addr;
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u16_t remote_port, port;
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int ret;
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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/* get the peer if currently connected */
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netconn_peer(sock->conn, &addr, &port);
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remote_addr.addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
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remote_port = ((struct sockaddr_in *)to)->sin_port;
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netconn_connect(sock->conn, &remote_addr, remote_port);
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ret = lwip_send(s, data, size, flags);
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/* reset the remote address and port number
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of the connection */
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netconn_connect(sock->conn, addr, port);
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return ret;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_socket(int domain, int type, int protocol)
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{
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struct netconn *conn;
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int i;
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/* create a netconn */
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switch(type) {
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case SOCK_DGRAM:
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conn = netconn_new(NETCONN_UDP);
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break;
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case SOCK_STREAM:
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conn = netconn_new(NETCONN_TCP);
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break;
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default:
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/* errno = ... */
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return -1;
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}
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if(conn == NULL) {
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DEBUGF(SOCKETS_DEBUG, ("socket: could not create netconn.\n"));
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/* errno = ENOBUFS; */
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return -1;
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}
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i = alloc_socket(conn);
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if(i == -1) {
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/* errno = ENOBUFS; */
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netconn_delete(conn);
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}
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return i;
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}
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/*-----------------------------------------------------------------------------------*/
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int
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lwip_write(int s, void *data, int size)
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{
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struct lwip_socket *sock;
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err_t err;
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DEBUGF(SOCKETS_DEBUG, ("write: socket %d, size %d\n", s, size));
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sock = get_socket(s);
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if(sock == NULL) {
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return -1;
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}
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switch(netconn_type(sock->conn)) {
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case NETCONN_UDP:
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return lwip_send(s, data, size, 0);
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case NETCONN_TCP:
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err = netconn_write(sock->conn, data, size, NETCONN_COPY);
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break;
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default:
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err = ERR_ARG;
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break;
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}
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if(err != ERR_OK) {
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/* errno = ... */
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return -1;
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}
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return size;
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}
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/*-----------------------------------------------------------------------------------*/
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