[457] | 1 | /*
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| 2 | * Copyright (c) 2016 Stephan Linz <linz@li-pro.net>, Li-Pro.Net
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Based on examples provided by
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| 6 | * Iwan Budi Kusnanto <ibk@labhijau.net> (https://gist.github.com/iwanbk/1399729)
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| 7 | * Juri Haberland <juri@sapienti-sat.org> (https://lists.gnu.org/archive/html/lwip-users/2007-06/msg00078.html)
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| 8 | *
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| 9 | * Redistribution and use in source and binary forms, with or without modification,
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| 10 | * are permitted provided that the following conditions are met:
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| 11 | *
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| 12 | * 1. Redistributions of source code must retain the above copyright notice,
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| 13 | * this list of conditions and the following disclaimer.
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer in the documentation
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| 16 | * and/or other materials provided with the distribution.
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| 17 | * 3. The name of the author may not be used to endorse or promote products
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| 18 | * derived from this software without specific prior written permission.
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| 19 | *
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 23 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 25 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 28 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 29 | * OF SUCH DAMAGE.
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| 30 | *
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| 31 | * This file is part of and a contribution to the lwIP TCP/IP stack.
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| 32 | *
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| 33 | * Credits go to Adam Dunkels (and the current maintainers) of this software.
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| 34 | *
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| 35 | * Stephan Linz rewrote this file to get a basic echo example.
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| 36 | */
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| 37 |
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| 38 | /**
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| 39 | * @file
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| 40 | * UDP echo server example using raw API.
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| 41 | *
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| 42 | * Echos all bytes sent by connecting client,
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| 43 | * and passively closes when client is done.
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| 44 | *
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| 45 | */
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| 46 |
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| 47 | #include "lwip/opt.h"
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| 48 | #include "lwip/debug.h"
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| 49 | #include "lwip/stats.h"
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| 50 | #include "lwip/udp.h"
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| 51 | #include "udpecho_raw.h"
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| 52 |
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| 53 | #if LWIP_UDP
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| 54 |
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| 55 | static struct udp_pcb *udpecho_raw_pcb;
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| 56 |
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| 57 | static void
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| 58 | udpecho_raw_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p,
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| 59 | const ip_addr_t *addr, u16_t port)
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| 60 | {
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| 61 | LWIP_UNUSED_ARG(arg);
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| 62 | if (p != NULL) {
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| 63 | /* send received packet back to sender */
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| 64 | udp_sendto(upcb, p, addr, port);
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| 65 | /* free the pbuf */
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| 66 | pbuf_free(p);
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| 67 | }
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| 68 | }
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| 69 |
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| 70 | void
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| 71 | udpecho_raw_init(void)
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| 72 | {
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| 73 | udpecho_raw_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
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| 74 | if (udpecho_raw_pcb != NULL) {
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| 75 | err_t err;
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| 76 |
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| 77 | err = udp_bind(udpecho_raw_pcb, IP_ANY_TYPE, 7);
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| 78 | if (err == ERR_OK) {
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| 79 | udp_recv(udpecho_raw_pcb, udpecho_raw_recv, NULL);
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| 80 | } else {
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| 81 | /* abort? output diagnostic? */
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| 82 | }
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| 83 | } else {
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| 84 | /* abort? output diagnostic? */
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | #endif /* LWIP_UDP */
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