A significantly simpler API for sending UDP packets
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Adam Dunkels
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212
core/net/simple-udp.c
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212
core/net/simple-udp.c
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/**
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* \addtogroup simple-udp
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* @{
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*/
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/*
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* Copyright (c) 2011, 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
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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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* \file
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* Header file for the simple-udp module.
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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#include "simple-udp.h"
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#include "contiki-net.h"
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PROCESS(simple_udp_process, "Simple UDP process");
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static uint8_t started = 0;
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static uint8_t databuffer[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_simple_udp(void)
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{
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if(started == 0) {
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process_start(&simple_udp_process, NULL);
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started = 1;
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Send a UDP packet
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* \param c A pointer to a struct simple_udp_connection
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* \param data A pointer to the data to be sent
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* \param datalen The length of the data
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*
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* This function sends a UDP packet. The packet will be
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* sent to the IP address and with the UDP ports that were
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* specified when the connection wa registered with
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* simple_udp_register().
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*
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* \sa simple_udp_sendto()
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*/
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int
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simple_udp_send(struct simple_udp_connection *c,
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const void *data, uint16_t datalen)
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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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&c->remote_addr, UIP_HTONS(c->remote_port));
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Send a UDP packet to a specified IP address
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* \param c A pointer to a struct simple_udp_connection
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* \param data A pointer to the data to be sent
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* \param datalen The length of the data
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* \param to The IP address of the receiver
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*
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* This function sends a UDP packet to a specified IP
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* address. The packet will be sent with the UDP ports
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* that were specified when the connection wa registered
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* with simple_udp_register().
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*
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* \sa simple_udp_send()
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*/
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int
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simple_udp_sendto(struct simple_udp_connection *c,
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const void *data, uint16_t datalen,
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const uip_ipaddr_t *to)
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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(c->remote_port));
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Register a UDP connection
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* \param c A pointer to a struct simple_udp_connection
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* \param local_port The local UDP port in host byte order
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* \param remote_addr The remote IP address
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* \param remote_port The remote UDP port in host byte order
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* \param receive_callback A pointer to a function to be called for incoming packets
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* \retval 0 If no UDP connection could be allocated
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* \retval 1 If the connection was successfully allocated
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*
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* This function registers a UDP connection and attaches a
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* callback function to it. The callback function will be
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* called for incoming packets. The local UDP port can be
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* set to 0 to indicate that an ephemeral UDP port should
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* be allocated. The remote IP address can be NULL, to
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* indicate that packets from any IP address should be
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* accepted.
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*
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*/
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int
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simple_udp_register(struct simple_udp_connection *c,
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uint16_t local_port,
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uip_ipaddr_t *remote_addr,
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uint16_t remote_port,
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simple_udp_callback receive_callback)
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{
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init_simple_udp();
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c->local_port = local_port;
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c->remote_port = remote_port;
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if(remote_addr != NULL) {
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uip_ipaddr_copy(&c->remote_addr, remote_addr);
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}
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c->receive_callback = receive_callback;
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PROCESS_CONTEXT_BEGIN(&simple_udp_process);
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c->udp_conn = udp_new(remote_addr, UIP_HTONS(remote_port), c);
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if(c->udp_conn != NULL) {
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udp_bind(c->udp_conn, UIP_HTONS(local_port));
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}
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PROCESS_CONTEXT_END();
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if(c->udp_conn == NULL) {
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return 0;
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(simple_udp_process, ev, data)
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{
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struct simple_udp_connection *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 simple_udp_register() as the
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struct simple_udp_connection pointer. So we extract this
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pointer and use it when calling the reception callback. */
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c = (struct simple_udp_connection *)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(databuffer, 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->receive_callback != NULL) {
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PROCESS_CONTEXT_BEGIN(c->client_process);
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c->receive_callback(c,
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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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databuffer, 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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94
core/net/simple-udp.h
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94
core/net/simple-udp.h
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@ -0,0 +1,94 @@
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/**
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* \addtogroup uip
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* @{
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*/
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/**
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* \defgroup simple-udp
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*
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* The default Contiki UDP API is difficult to use. The simple-udp
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* module provides a significantly simpler API.
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*
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* @{
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*/
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/*
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* Copyright (c) 2011, 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
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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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* \file
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* Header file for the simple-udp module.
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef SIMPLE_UDP_H
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#define SIMPLE_UDP_H
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#include "net/uip.h"
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struct simple_udp_connection;
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typedef void (* simple_udp_callback)(struct simple_udp_connection *c,
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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, uint16_t datalen);
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struct simple_udp_connection {
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struct simple_udp_connection *next;
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uip_ipaddr_t remote_addr;
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uint16_t remote_port, local_port;
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simple_udp_callback receive_callback;
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struct uip_udp_conn *udp_conn;
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struct process *client_process;
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};
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int simple_udp_register(struct simple_udp_connection *c,
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uint16_t local_port,
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uip_ipaddr_t *remote_addr,
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uint16_t remote_port,
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simple_udp_callback receive_callback);
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int simple_udp_send(struct simple_udp_connection *c,
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const void *data, uint16_t datalen);
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int simple_udp_sendto(struct simple_udp_connection *c,
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const void *data, uint16_t datalen,
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const uip_ipaddr_t *to);
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void simple_udp_init(void);
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#endif /* SIMPLE_UDP_H */
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/** @} */
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/** @} */
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