mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-30 19:29:45 +00:00
380 lines
11 KiB
C
380 lines
11 KiB
C
/*
|
|
* Copyright (c) 2010, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Implementation of the servreg-hack application
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
/** \addtogroup servreghack
|
|
* @{ */
|
|
|
|
#include "contiki.h"
|
|
#include "contiki-lib.h"
|
|
#include "contiki-net.h"
|
|
|
|
#include "net/ip/uip.h"
|
|
|
|
#include "net/ipv6/uip-ds6.h"
|
|
|
|
#include "servreg-hack.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
struct servreg_hack_registration {
|
|
struct servreg_hack_registration *next;
|
|
|
|
struct timer timer;
|
|
uip_ipaddr_t addr;
|
|
servreg_hack_id_t id;
|
|
uint8_t seqno;
|
|
};
|
|
|
|
|
|
#define MAX_REGISTRATIONS 16
|
|
|
|
LIST(others_services);
|
|
LIST(own_services);
|
|
|
|
MEMB(registrations, struct servreg_hack_registration, MAX_REGISTRATIONS);
|
|
|
|
PROCESS(servreg_hack_process, "Service regstry hack");
|
|
|
|
#define PERIOD_TIME 120 * CLOCK_SECOND
|
|
|
|
#define NEW_REG_TIME 10 * CLOCK_SECOND
|
|
|
|
#define MAX_BUFSIZE 2 + 80
|
|
|
|
#define UDP_PORT 61616
|
|
|
|
#define LIFETIME 10 * 60 * CLOCK_SECOND
|
|
|
|
#define SEQNO_LT(a, b) ((signed char)((a) - (b)) < 0)
|
|
|
|
static struct etimer sendtimer;
|
|
|
|
static uint8_t started = 0;
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Go through the list of registrations and remove those that are too
|
|
old. */
|
|
static void
|
|
purge_registrations(void)
|
|
{
|
|
struct servreg_hack_registration *t;
|
|
|
|
for(t = list_head(own_services);
|
|
t != NULL;
|
|
t = list_item_next(t)) {
|
|
if(timer_expired(&t->timer)) {
|
|
t->seqno++;
|
|
timer_set(&t->timer, LIFETIME / 2);
|
|
}
|
|
}
|
|
|
|
for(t = list_head(others_services);
|
|
t != NULL;
|
|
t = list_item_next(t)) {
|
|
if(timer_expired(&t->timer)) {
|
|
list_remove(others_services, t);
|
|
memb_free(®istrations, t);
|
|
t = list_head(others_services);
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
servreg_hack_init(void)
|
|
{
|
|
if(started == 0) {
|
|
list_init(others_services);
|
|
list_init(own_services);
|
|
memb_init(®istrations);
|
|
|
|
process_start(&servreg_hack_process, NULL);
|
|
started = 1;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
servreg_hack_register(servreg_hack_id_t id, const uip_ipaddr_t *addr)
|
|
{
|
|
servreg_hack_item_t *t;
|
|
struct servreg_hack_registration *r;
|
|
/* Walk through list, see if we already have a service ID
|
|
registered. If not, allocate a new registration and put it on our
|
|
list. If we cannot allocate a service registration, we reuse one
|
|
from the service registrations made by others. */
|
|
|
|
servreg_hack_init();
|
|
|
|
for(t = list_head(own_services);
|
|
t != NULL;
|
|
t = list_item_next(t)) {
|
|
if(servreg_hack_item_id(t) == id) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
r = memb_alloc(®istrations);
|
|
if(r == NULL) {
|
|
printf("servreg_hack_register: error, could not allocate memory, should reclaim another registration but this has not been implemented yet.\n");
|
|
return;
|
|
}
|
|
r->id = id;
|
|
r->seqno = 1;
|
|
uip_ipaddr_copy(&r->addr, addr);
|
|
timer_set(&r->timer, LIFETIME / 2);
|
|
list_push(own_services, r);
|
|
|
|
|
|
PROCESS_CONTEXT_BEGIN(&servreg_hack_process);
|
|
etimer_set(&sendtimer, random_rand() % (NEW_REG_TIME));
|
|
PROCESS_CONTEXT_END(&servreg_hack_process);
|
|
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
servreg_hack_item_t *
|
|
servreg_hack_list_head(void)
|
|
{
|
|
purge_registrations();
|
|
return list_head(others_services);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
servreg_hack_id_t
|
|
servreg_hack_item_id(servreg_hack_item_t *item)
|
|
{
|
|
return ((struct servreg_hack_registration *)item)->id;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
uip_ipaddr_t *
|
|
servreg_hack_item_address(servreg_hack_item_t *item)
|
|
{
|
|
return &((struct servreg_hack_registration *)item)->addr;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
uip_ipaddr_t *
|
|
servreg_hack_lookup(servreg_hack_id_t id)
|
|
{
|
|
servreg_hack_item_t *t;
|
|
|
|
servreg_hack_init();
|
|
|
|
purge_registrations();
|
|
|
|
for(t = servreg_hack_list_head(); t != NULL; t = list_item_next(t)) {
|
|
if(servreg_hack_item_id(t) == id) {
|
|
return servreg_hack_item_address(t);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
handle_incoming_reg(const uip_ipaddr_t *owner, servreg_hack_id_t id, uint8_t seqno)
|
|
{
|
|
servreg_hack_item_t *t;
|
|
struct servreg_hack_registration *r;
|
|
|
|
/* Walk through list, see if we already have a service ID
|
|
registered. If so, we do different things depending on the seqno
|
|
of the update: if the seqno is older than what we have, we
|
|
discard the incoming registration. If the seqno is newer than
|
|
what we have, we reset the lifetime timer of the current
|
|
registration.
|
|
|
|
If we did not have the service registered already, we allocate a
|
|
new registration and put it on our list. If we cannot allocate a
|
|
service registration, we discard the incoming registration (for
|
|
now - we might later choose to discard the oldest registration
|
|
that we have). */
|
|
|
|
for(t = servreg_hack_list_head();
|
|
t != NULL;
|
|
t = list_item_next(t)) {
|
|
if(servreg_hack_item_id(t) == id) {
|
|
r = t;
|
|
if(SEQNO_LT(r->seqno, seqno)) {
|
|
r->seqno = seqno;
|
|
timer_set(&r->timer, LIFETIME);
|
|
|
|
/* Put item first on list, so that subsequent lookups will
|
|
find this one. */
|
|
list_remove(others_services, r);
|
|
list_push(others_services, r);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
r = memb_alloc(®istrations);
|
|
if(r == NULL) {
|
|
printf("servreg_hack_register: error, could not allocate memory, should reclaim another registration but this has not been implemented yet.\n");
|
|
return;
|
|
}
|
|
r->id = id;
|
|
r->seqno = 1;
|
|
uip_ipaddr_copy(&r->addr, owner);
|
|
timer_set(&r->timer, LIFETIME);
|
|
list_add(others_services, r);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* The structure of UDP messages:
|
|
*
|
|
* +-------------------+-------------------+
|
|
* | Numregs (1 byte) | Flags (1 byte) |
|
|
* +-------------------+-------------------+-------------------+
|
|
* | IP addr (16 bytes)| 3 regs (3 bytes) | Seqno (1 byte) |
|
|
* +-------------------+-------------------+-------------------+
|
|
* | IP addr (16 bytes)| 3 regs (3 bytes) | Seqno (1 byte) |
|
|
* +-------------------+-------------------+-------------------+
|
|
* | ... | ... | ... |
|
|
* +-------------------+-------------------+-------------------+
|
|
*/
|
|
|
|
#define MSG_NUMREGS_OFFSET 0
|
|
#define MSG_FLAGS_OFFSET 1
|
|
#define MSG_ADDRS_OFFSET 2
|
|
|
|
#define MSG_IPADDR_SUBOFFSET 0
|
|
#define MSG_REGS_SUBOFFSET 16
|
|
#define MSG_SEQNO_SUBOFFSET 19
|
|
|
|
#define MSG_ADDRS_LEN 20
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_udp_packet(struct uip_udp_conn *conn)
|
|
{
|
|
int numregs;
|
|
uint8_t buf[MAX_BUFSIZE];
|
|
int bufptr;
|
|
servreg_hack_item_t *t;
|
|
|
|
buf[MSG_FLAGS_OFFSET] = 0;
|
|
|
|
numregs = 0;
|
|
bufptr = MSG_ADDRS_OFFSET;
|
|
|
|
for(t = list_head(own_services);
|
|
(bufptr + MSG_ADDRS_LEN <= MAX_BUFSIZE) && t != NULL;
|
|
t = list_item_next(t)) {
|
|
|
|
uip_ipaddr_copy((uip_ipaddr_t *)&buf[bufptr + MSG_IPADDR_SUBOFFSET],
|
|
servreg_hack_item_address(t));
|
|
buf[bufptr + MSG_REGS_SUBOFFSET] =
|
|
servreg_hack_item_id(t);
|
|
buf[bufptr + MSG_REGS_SUBOFFSET + 1] =
|
|
buf[bufptr + MSG_REGS_SUBOFFSET + 2] = 0;
|
|
buf[bufptr + MSG_SEQNO_SUBOFFSET] = ((struct servreg_hack_registration *)t)->seqno;
|
|
|
|
bufptr += MSG_ADDRS_LEN;
|
|
++numregs;
|
|
}
|
|
|
|
for(t = servreg_hack_list_head();
|
|
(bufptr + MSG_ADDRS_LEN <= MAX_BUFSIZE) && t != NULL;
|
|
t = list_item_next(t)) {
|
|
uip_ipaddr_copy((uip_ipaddr_t *)&buf[bufptr + MSG_IPADDR_SUBOFFSET],
|
|
servreg_hack_item_address(t));
|
|
buf[bufptr + MSG_REGS_SUBOFFSET] =
|
|
servreg_hack_item_id(t);
|
|
buf[bufptr + MSG_REGS_SUBOFFSET + 1] =
|
|
buf[bufptr + MSG_REGS_SUBOFFSET + 2] = 0;
|
|
buf[bufptr + MSG_SEQNO_SUBOFFSET] = ((struct servreg_hack_registration *)t)->seqno;
|
|
|
|
bufptr += MSG_ADDRS_LEN;
|
|
++numregs;
|
|
}
|
|
/* printf("send_udp_packet numregs %d\n", numregs);*/
|
|
buf[MSG_NUMREGS_OFFSET] = numregs;
|
|
|
|
if(numregs > 0) {
|
|
/* printf("Sending buffer len %d\n", bufptr);*/
|
|
uip_udp_packet_send(conn, buf, bufptr);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
parse_incoming_packet(const uint8_t *buf, int len)
|
|
{
|
|
int numregs;
|
|
int i;
|
|
int bufptr;
|
|
|
|
numregs = buf[MSG_NUMREGS_OFFSET];
|
|
|
|
bufptr = MSG_ADDRS_OFFSET;
|
|
for(i = 0; i < numregs; ++i) {
|
|
handle_incoming_reg((uip_ipaddr_t *)&buf[bufptr + MSG_IPADDR_SUBOFFSET],
|
|
buf[bufptr + MSG_REGS_SUBOFFSET],
|
|
buf[bufptr + MSG_SEQNO_SUBOFFSET]);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS_THREAD(servreg_hack_process, ev, data)
|
|
{
|
|
static struct etimer periodic;
|
|
static struct uip_udp_conn *outconn, *inconn;
|
|
PROCESS_BEGIN();
|
|
|
|
/* Create outbound UDP connection. */
|
|
outconn = udp_broadcast_new(UIP_HTONS(UDP_PORT), NULL);
|
|
udp_bind(outconn, UIP_HTONS(UDP_PORT));
|
|
|
|
/* Create inbound UDP connection. */
|
|
inconn = udp_new(NULL, UIP_HTONS(UDP_PORT), NULL);
|
|
udp_bind(inconn, UIP_HTONS(UDP_PORT));
|
|
|
|
etimer_set(&periodic, PERIOD_TIME);
|
|
etimer_set(&sendtimer, random_rand() % (PERIOD_TIME));
|
|
while(1) {
|
|
PROCESS_WAIT_EVENT();
|
|
if(ev == PROCESS_EVENT_TIMER && data == &periodic) {
|
|
etimer_reset(&periodic);
|
|
etimer_set(&sendtimer, random_rand() % (PERIOD_TIME));
|
|
} else if(ev == PROCESS_EVENT_TIMER && data == &sendtimer) {
|
|
send_udp_packet(outconn);
|
|
} else if(ev == tcpip_event) {
|
|
parse_incoming_packet(uip_appdata, uip_datalen());
|
|
}
|
|
}
|
|
PROCESS_END();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/** @} */
|