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The UDP socket API code
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Adam Dunkels
parent
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commit
d1d82eb179
199
core/net/ip/udp-socket.c
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199
core/net/ip/udp-socket.c
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/*
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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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193
core/net/ip/udp-socket.h
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193
core/net/ip/udp-socket.h
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@ -0,0 +1,193 @@
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/*
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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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#ifndef UDP_SOCKET_H
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#define UDP_SOCKET_H
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#include "net/ip/uip.h"
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struct udp_socket;
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/**
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* \brief A UDP socket callback function
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* \param c A pointer to the struct udp_socket that received the data
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* \param ptr An opaque pointer that was specified when the UDP socket was registered with udp_socket_register()
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* \param source_addr The IP address from which the datagram was sent
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* \param source_port The UDP port number, in host byte order, from which the datagram was sent
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* \param dest_addr The IP address that this datagram was sent to
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* \param dest_port The UDP port number, in host byte order, that the datagram was sent to
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* \param data A pointer to the data contents of the UDP datagram
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* \param datalen The length of the data being pointed to by the data pointer
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*
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* Each UDP socket has a callback function that is
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* registered as part of the call to
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* udp_socket_register(). The callback function gets
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* called every time a UDP packet is received.
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*/
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typedef void (* udp_socket_input_callback_t)(struct udp_socket *c,
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void *ptr,
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const uip_ipaddr_t *source_addr,
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uint16_t source_port,
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const uip_ipaddr_t *dest_addr,
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uint16_t dest_port,
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const uint8_t *data,
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uint16_t datalen);
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struct udp_socket {
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udp_socket_input_callback_t input_callback;
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void *ptr;
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struct process *p;
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struct uip_udp_conn *udp_conn;
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};
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/**
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* \brief Register a UDP socket
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* \param c A pointer to the struct udp_socket that should be registered
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* \param ptr An opaque pointer that will be passed to callbacks
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* \param receive_callback A function pointer to the callback function that will be called when data arrives
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* \retval -1 The registration failed
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* \retval 1 The registration succeeded
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*
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* This function registers the UDP socket with the
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* system. A UDP socket must be registered before any data
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* can be sent or received over the socket.
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*
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* The caller must allocate memory for the struct
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* udp_socket that is to be registered.
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*
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* A UDP socket can begin to receive data by calling
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* udp_socket_bind().
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*
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*/
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int udp_socket_register(struct udp_socket *c,
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void *ptr,
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udp_socket_input_callback_t receive_callback);
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/**
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* \brief Bind a UDP socket to a local port
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* \param c A pointer to the struct udp_socket that should be bound to a local port
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* \param local_port The UDP port number, in host byte order, to bind the UDP socket to
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* \retval -1 Binding the UDP socket to the local port failed
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* \retval 1 Binding the UDP socket to the local port succeeded
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*
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* This function binds the UDP socket to a local port so
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* that it will begin to receive data that arrives on the
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* specified port. A UDP socket will receive data
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* addressed to the specified port number on any IP
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* address of the host.
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*
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* A UDP socket that is bound to a local port will use
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* this port number as a source port in outgoing UDP
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* messages.
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*
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*/
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int udp_socket_bind(struct udp_socket *c,
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uint16_t local_port);
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/**
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* \brief Bind a UDP socket to a remote address and port
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* \param c A pointer to the struct udp_socket that should be connected
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* \param remote_addr The IP address of the remote host, or NULL if the UDP socket should only be connected to a specific port
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* \param remote_port The UDP port number, in host byte order, to which the UDP socket should be connected
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* \retval -1 Connecting the UDP socket failed
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* \retval 1 Connecting the UDP socket succeeded
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*
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* This function connects the UDP socket to a specific
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* remote port and optional remote IP address. When a UDP
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* socket is connected to a remote port and address, it
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* will only receive packets that are sent from the remote
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* port and address. When sending data over a connected
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* UDP socket, the data will be sent to the connected
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* remote address.
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*
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* A UDP socket can be connected to a remote port, but not
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* a remote IP address, by providing a NULL parameter as
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* the remote_addr parameter. This lets the UDP socket
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* receive data from any IP address on the specified port.
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*
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*/
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int 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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* \brief Send data on a UDP socket
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* \param c A pointer to the struct udp_socket on which the data should be sent
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* \param data A pointer to the data that should be sent
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* \param datalen The length of the data to be sent
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* \return The number of bytes sent, or -1 if an error occurred
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*
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* This function sends data over a UDP socket. The UDP
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* socket must have been connected to a remote address and
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* port with udp_socket_connect().
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*
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*/
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int 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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* \brief Send data on a UDP socket to a specific address and port
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* \param c A pointer to the struct udp_socket on which the data should be sent
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* \param data A pointer to the data that should be sent
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* \param datalen The length of the data to be sent
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* \param addr The IP address to which the data should be sent
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* \param port The UDP port number, in host byte order, to which the data should be sent
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* \return The number of bytes sent, or -1 if an error occurred
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*
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* This function sends data over a UDP socket to a
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* specific address and port.
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*
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* The UDP socket does not have to be connected to use
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* this function.
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*
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*/
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int 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 *addr, uint16_t port);
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/**
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* \brief Close a UDP socket
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* \param c A pointer to the struct udp_socket to be closed
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* \retval -1 If closing the UDP socket failed
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* \retval 1 If closing the UDP socket succeeded
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*
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* This function closes a UDP socket that has previously
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* been registered with udp_socket_register(). All
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* registered UDP sockets must be closed before exiting
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* the process that registered them, or undefined behavior
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* may occur.
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*
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*/
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int udp_socket_close(struct udp_socket *c);
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#endif /* UDP_SOCKET_H */
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