mirror of
https://github.com/oliverschmidt/contiki.git
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200 lines
6.1 KiB
C
200 lines
6.1 KiB
C
/*
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* Copyright (c) 2012-2014, Thingsquare, http://www.thingsquare.com/.
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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
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "contiki-net.h"
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#include "udp-socket.h"
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#include <string.h>
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PROCESS(udp_socket_process, "UDP socket process");
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static uint8_t buf[UIP_BUFSIZE];
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#define UIP_IP_BUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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static uint8_t inited = 0;
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if(!inited) {
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inited = 1;
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process_start(&udp_socket_process, NULL);
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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udp_socket_register(struct udp_socket *c,
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void *ptr,
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udp_socket_input_callback_t input_callback)
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{
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init();
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if(c == NULL) {
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return -1;
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}
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c->ptr = ptr;
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c->input_callback = input_callback;
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c->p = PROCESS_CURRENT();
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PROCESS_CONTEXT_BEGIN(&udp_socket_process);
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c->udp_conn = udp_new(NULL, 0, c);
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PROCESS_CONTEXT_END();
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if(c->udp_conn == NULL) {
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return -1;
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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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udp_socket_close(struct udp_socket *c)
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{
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if(c == NULL) {
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return -1;
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}
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if(c->udp_conn != NULL) {
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uip_udp_remove(c->udp_conn);
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return 1;
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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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udp_socket_bind(struct udp_socket *c,
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uint16_t local_port)
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{
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if(c == NULL || c->udp_conn == NULL) {
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return -1;
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}
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udp_bind(c->udp_conn, UIP_HTONS(local_port));
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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int
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udp_socket_connect(struct udp_socket *c,
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uip_ipaddr_t *remote_addr,
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uint16_t remote_port)
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{
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if(c == NULL || c->udp_conn == NULL) {
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return -1;
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}
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if(remote_addr != NULL) {
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uip_ipaddr_copy(&c->udp_conn->ripaddr, remote_addr);
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}
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c->udp_conn->rport = UIP_HTONS(remote_port);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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int
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udp_socket_send(struct udp_socket *c,
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const void *data, uint16_t datalen)
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{
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if(c == NULL || c->udp_conn == NULL) {
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return -1;
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}
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uip_udp_packet_send(c->udp_conn, data, datalen);
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return datalen;
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}
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/*---------------------------------------------------------------------------*/
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int
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udp_socket_sendto(struct udp_socket *c,
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const void *data, uint16_t datalen,
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const uip_ipaddr_t *to,
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uint16_t port)
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{
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if(c == NULL || c->udp_conn == NULL) {
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return -1;
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}
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if(c->udp_conn != NULL) {
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uip_udp_packet_sendto(c->udp_conn, data, datalen,
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to, UIP_HTONS(port));
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return datalen;
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}
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(udp_socket_process, ev, data)
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{
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struct udp_socket *c;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == tcpip_event) {
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/* An appstate pointer is passed to use from the IP stack
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through the 'data' pointer. We registered this appstate when
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we did the udp_new() call in udp_socket_register() as the
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struct udp_socket pointer. So we extract this
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pointer and use it when calling the reception callback. */
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c = (struct udp_socket *)data;
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/* Defensive coding: although the appstate *should* be non-null
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here, we make sure to avoid the program crashing on us. */
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if(c != NULL) {
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/* If we were called because of incoming data, we should call
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the reception callback. */
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if(uip_newdata()) {
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/* Copy the data from the uIP data buffer into our own
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buffer to avoid the uIP buffer being messed with by the
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callee. */
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memcpy(buf, uip_appdata, uip_datalen());
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/* Call the client process. We use the PROCESS_CONTEXT
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mechanism to temporarily switch process context to the
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client process. */
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if(c->input_callback != NULL) {
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PROCESS_CONTEXT_BEGIN(c->p);
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c->input_callback(c, c->ptr,
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&(UIP_IP_BUF->srcipaddr),
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UIP_HTONS(UIP_IP_BUF->srcport),
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&(UIP_IP_BUF->destipaddr),
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UIP_HTONS(UIP_IP_BUF->destport),
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buf, uip_datalen());
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PROCESS_CONTEXT_END();
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}
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}
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}
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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