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https://github.com/lwip-tcpip/lwip.git
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89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
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/*
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* Copyright (c) 2016 Stephan Linz <linz@li-pro.net>, Li-Pro.Net
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* All rights reserved.
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*
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* Based on examples provided by
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* Iwan Budi Kusnanto <ibk@labhijau.net> (https://gist.github.com/iwanbk/1399729)
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* Juri Haberland <juri@sapienti-sat.org> (https://lists.gnu.org/archive/html/lwip-users/2007-06/msg00078.html)
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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 and a contribution to the lwIP TCP/IP stack.
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*
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* Credits go to Adam Dunkels (and the current maintainers) of this software.
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*
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* Stephan Linz rewrote this file to get a basic echo example.
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*/
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/**
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* @file
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* UDP echo server example using raw API.
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*
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* Echos all bytes sent by connecting client,
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* and passively closes when client is done.
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/debug.h"
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#include "lwip/stats.h"
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#include "lwip/udp.h"
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#include "udpecho_raw.h"
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#if LWIP_UDP
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static struct udp_pcb *udpecho_raw_pcb;
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static void
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udpecho_raw_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p,
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const ip_addr_t *addr, u16_t port)
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{
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LWIP_UNUSED_ARG(arg);
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if (p != NULL) {
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/* send received packet back to sender */
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udp_sendto(upcb, p, addr, port);
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/* free the pbuf */
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pbuf_free(p);
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}
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}
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void
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udpecho_raw_init(void)
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{
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udpecho_raw_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
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if (udpecho_raw_pcb != NULL) {
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err_t err;
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err = udp_bind(udpecho_raw_pcb, IP_ANY_TYPE, 7);
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if (err == ERR_OK) {
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udp_recv(udpecho_raw_pcb, udpecho_raw_recv, NULL);
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} else {
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/* abort? output diagnostic? */
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}
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} else {
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/* abort? output diagnostic? */
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}
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}
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#endif /* LWIP_UDP */
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