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net.c
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/* net.c -- CoAP network interface
*
* Copyright (C) 2010--2014 Olaf Bergmann <[email protected]>
*
* This file is part of the CoAP library libcoap. Please see
* README for terms of use.
*/
#include "config.h"
#include <ctype.h>
#include <stdio.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#elif HAVE_SYS_UNISTD_H
#include <sys/unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef WITH_LWIP
#include <lwip/pbuf.h>
#include <lwip/udp.h>
#include <lwip/timers.h>
#endif
#include "debug.h"
#include "mem.h"
#include "str.h"
#include "async.h"
#include "resource.h"
#include "option.h"
#include "encode.h"
#include "block.h"
#include "net.h"
#if defined(WITH_POSIX)
time_t clock_offset;
static inline coap_queue_t *
coap_malloc_node() {
return (coap_queue_t *)coap_malloc(sizeof(coap_queue_t));
}
static inline void
coap_free_node(coap_queue_t *node) {
coap_free(node);
}
#endif /* WITH_POSIX */
#ifdef WITH_LWIP
#include <lwip/memp.h>
static void coap_retransmittimer_execute(void *arg);
static void coap_retransmittimer_restart(coap_context_t *ctx);
static inline coap_queue_t *
coap_malloc_node() {
return (coap_queue_t *)memp_malloc(MEMP_COAP_NODE);
}
static inline void
coap_free_node(coap_queue_t *node) {
memp_free(MEMP_COAP_NODE, node);
}
#endif /* WITH_LWIP */
#ifdef WITH_CONTIKI
# ifndef DEBUG
# define DEBUG DEBUG_PRINT
# endif /* DEBUG */
#include "memb.h"
#include "net/uip-debug.h"
clock_time_t clock_offset;
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLIPH_LEN])
void coap_resources_init();
void coap_pdu_resources_init();
unsigned char initialized = 0;
coap_context_t the_coap_context;
MEMB(node_storage, coap_queue_t, COAP_PDU_MAXCNT);
PROCESS(coap_retransmit_process, "message retransmit process");
static inline coap_queue_t *
coap_malloc_node() {
return (coap_queue_t *)memb_alloc(&node_storage);
}
static inline void
coap_free_node(coap_queue_t *node) {
memb_free(&node_storage, node);
}
#endif /* WITH_CONTIKI */
#ifdef WITH_LWIP
/** Callback to udp_recv when using lwIP. Gets called by lwIP on arriving
* packages, places a reference in context->pending_package, and calls
* coap_read to process the package. Thus, coap_read needs not be called in
* lwIP main loops. (When modifying this for thread-like operation, ie. if you
* remove the coap_read call from this, make sure that coap_read gets a chance
* to run before this callback is entered the next time.)
*/
static void received_package(void *arg, struct udp_pcb *upcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
{
struct coap_context_t *context = (coap_context_t *)arg;
LWIP_ASSERT("pending_package was not cleared.", context->pending_package == NULL);
context->pending_package = p; /* we don't free it, coap_read has to do that */
context->pending_address.addr = addr->addr; /* FIXME: this has to become address-type independent, probably there'll be an lwip function for that */
context->pending_port = port;
coap_read(context);
}
#endif /* WITH_LWIP */
int print_wellknown(coap_context_t *, unsigned char *, size_t *, size_t, coap_opt_t *);
void coap_handle_failed_notify(coap_context_t *, const coap_address_t *,
const str *);
unsigned int
coap_adjust_basetime(coap_context_t *ctx, coap_tick_t now) {
unsigned int result = 0;
coap_tick_diff_t delta = now - ctx->sendqueue_basetime;
if (ctx->sendqueue) {
/* delta < 0 means that the new time stamp is before the old. */
if (delta <= 0) {
ctx->sendqueue->t -= delta;
} else {
/* This case is more complex: The time must be advanced forward,
* thus possibly leading to timed out elements at the queue's
* start. For every element that has timed out, its relative
* time is set to zero and the result counter is increased. */
coap_queue_t *q = ctx->sendqueue;
coap_tick_t t = 0;
while (q && (t + q->t < (coap_tick_t)delta)) {
t += q->t;
q->t = 0;
result++;
q = q->next;
}
/* finally adjust the first element that has not expired */
if (q) {
q->t = (coap_tick_t)delta - t;
}
}
}
/* adjust basetime */
ctx->sendqueue_basetime += delta;
return result;
}
int
coap_insert_node(coap_queue_t **queue, coap_queue_t *node) {
coap_queue_t *p, *q;
if ( !queue || !node )
return 0;
/* set queue head if empty */
if ( !*queue ) {
*queue = node;
return 1;
}
/* replace queue head if PDU's time is less than head's time */
q = *queue;
if (node->t < q->t) {
node->next = q;
*queue = node;
q->t -= node->t; /* make q->t relative to node->t */
return 1;
}
/* search for right place to insert */
do {
node->t -= q->t; /* make node-> relative to q->t */
p = q;
q = q->next;
} while (q && q->t <= node->t);
/* insert new item */
if (q) {
q->t -= node->t; /* make q->t relative to node->t */
}
node->next = q;
p->next = node;
return 1;
}
int
coap_delete_node(coap_queue_t *node) {
if ( !node )
return 0;
coap_delete_pdu(node->pdu);
coap_free_node(node);
return 1;
}
void
coap_delete_all(coap_queue_t *queue) {
if ( !queue )
return;
coap_delete_all( queue->next );
coap_delete_node( queue );
}
coap_queue_t *
coap_new_node() {
coap_queue_t *node;
node = coap_malloc_node();
if ( ! node ) {
#ifndef NDEBUG
coap_log(LOG_WARNING, "coap_new_node: malloc\n");
#endif
return NULL;
}
memset(node, 0, sizeof *node );
return node;
}
coap_queue_t *
coap_peek_next( coap_context_t *context ) {
if ( !context || !context->sendqueue )
return NULL;
return context->sendqueue;
}
coap_queue_t *
coap_pop_next( coap_context_t *context ) {
coap_queue_t *next;
if ( !context || !context->sendqueue )
return NULL;
next = context->sendqueue;
context->sendqueue = context->sendqueue->next;
if (context->sendqueue) {
context->sendqueue->t += next->t;
}
next->next = NULL;
return next;
}
#ifdef COAP_DEFAULT_WKC_HASHKEY
/** Checks if @p Key is equal to the pre-defined hash key for.well-known/core. */
#define is_wkc(Key) \
(memcmp((Key), COAP_DEFAULT_WKC_HASHKEY, sizeof(coap_key_t)) == 0)
#else
/* Implements a singleton to store a hash key for the .wellknown/core
* resources. */
int
is_wkc(coap_key_t k) {
static coap_key_t wkc;
static unsigned char _initialized = 0;
if (!_initialized) {
_initialized = coap_hash_path((unsigned char *)COAP_DEFAULT_URI_WELLKNOWN,
sizeof(COAP_DEFAULT_URI_WELLKNOWN) - 1, wkc);
}
return memcmp(k, wkc, sizeof(coap_key_t)) == 0;
}
#endif
coap_context_t *
coap_new_context(
const coap_address_t *listen_addr) {
#ifdef WITH_POSIX
coap_context_t *c = coap_malloc( sizeof( coap_context_t ) );
int reuse = 1;
#endif /* WITH_POSIX */
#ifdef WITH_LWIP
coap_context_t *c = memp_malloc(MEMP_COAP_CONTEXT);
#endif /* WITH_LWIP */
#ifdef WITH_CONTIKI
coap_context_t *c;
if (initialized)
return NULL;
#endif /* WITH_CONTIKI */
if (!listen_addr) {
coap_log(LOG_EMERG, "no listen address specified\n");
return NULL;
}
coap_clock_init();
#ifdef WITH_LWIP
prng_init(LWIP_RAND());
#else /* WITH_LWIP */
prng_init((unsigned long)listen_addr ^ clock_offset);
#endif /* WITH_LWIP */
#ifndef WITH_CONTIKI
if ( !c ) {
#ifndef NDEBUG
coap_log(LOG_EMERG, "coap_init: malloc:\n");
#endif
return NULL;
}
#endif /* not WITH_CONTIKI */
#ifdef WITH_CONTIKI
coap_resources_init();
coap_pdu_resources_init();
c = &the_coap_context;
initialized = 1;
#endif /* WITH_CONTIKI */
memset(c, 0, sizeof( coap_context_t ) );
/* initialize message id */
prng((unsigned char *)&c->message_id, sizeof(unsigned short));
/* register the critical options that we know */
coap_register_option(c, COAP_OPTION_IF_MATCH);
coap_register_option(c, COAP_OPTION_URI_HOST);
coap_register_option(c, COAP_OPTION_IF_NONE_MATCH);
coap_register_option(c, COAP_OPTION_URI_PORT);
coap_register_option(c, COAP_OPTION_URI_PATH);
coap_register_option(c, COAP_OPTION_URI_QUERY);
coap_register_option(c, COAP_OPTION_ACCEPT);
coap_register_option(c, COAP_OPTION_PROXY_URI);
coap_register_option(c, COAP_OPTION_PROXY_SCHEME);
coap_register_option(c, COAP_OPTION_BLOCK2);
coap_register_option(c, COAP_OPTION_BLOCK1);
#ifdef WITH_POSIX
c->sockfd = socket(listen_addr->addr.sa.sa_family, SOCK_DGRAM, 0);
if ( c->sockfd < 0 ) {
#ifndef NDEBUG
coap_log(LOG_EMERG, "coap_new_context: socket\n");
#endif /* WITH_POSIX */
goto onerror;
}
if ( setsockopt( c->sockfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse) ) < 0 ) {
#ifndef NDEBUG
coap_log(LOG_WARNING, "setsockopt SO_REUSEADDR\n");
#endif
}
if (bind(c->sockfd, &listen_addr->addr.sa, listen_addr->size) < 0) {
#ifndef NDEBUG
coap_log(LOG_EMERG, "coap_new_context: bind\n");
#endif
goto onerror;
}
return c;
onerror:
if ( c->sockfd >= 0 )
close ( c->sockfd );
coap_free( c );
return NULL;
#endif /* WITH_POSIX */
#ifdef WITH_CONTIKI
c->conn = udp_new(NULL, 0, NULL);
udp_bind(c->conn, listen_addr->port);
process_start(&coap_retransmit_process, (char *)c);
PROCESS_CONTEXT_BEGIN(&coap_retransmit_process);
#ifndef WITHOUT_OBSERVE
etimer_set(&c->notify_timer, COAP_RESOURCE_CHECK_TIME * COAP_TICKS_PER_SECOND);
#endif /* WITHOUT_OBSERVE */
/* the retransmit timer must be initialized to some large value */
etimer_set(&the_coap_context.retransmit_timer, 0xFFFF);
PROCESS_CONTEXT_END(&coap_retransmit_process);
return c;
#endif /* WITH_CONTIKI */
#ifdef WITH_LWIP
c->pcb = udp_new();
/* hard assert: this is not expected to fail dynamically */
LWIP_ASSERT("Failed to allocate PCB for CoAP", c->pcb != NULL);
udp_recv(c->pcb, received_package, (void*)c);
udp_bind(c->pcb, &listen_addr->addr, listen_addr->port);
c->timer_configured = 0;
return c;
#endif
}
void
coap_free_context( coap_context_t *context ) {
#if defined(WITH_POSIX) || defined(WITH_LWIP)
coap_resource_t *res;
#ifndef COAP_RESOURCES_NOHASH
coap_resource_t *rtmp;
#endif
#endif /* WITH_POSIX || WITH_LWIP */
if ( !context )
return;
coap_delete_all(context->recvqueue);
coap_delete_all(context->sendqueue);
#ifdef WITH_LWIP
context->sendqueue = NULL;
coap_retransmittimer_restart(context);
#endif
#if defined(WITH_POSIX) || defined(WITH_LWIP)
#ifdef COAP_RESOURCES_NOHASH
LL_FOREACH(context->resources, res) {
#else
HASH_ITER(hh, context->resources, res, rtmp) {
#endif
coap_delete_resource(context, res->key);
}
#endif /* WITH_POSIX || WITH_LWIP */
#ifdef WITH_POSIX
/* coap_delete_list(context->subscriptions); */
close( context->sockfd );
coap_free( context );
#endif
#ifdef WITH_LWIP
udp_remove(context->pcb);
memp_free(MEMP_COAP_CONTEXT, context);
#endif
#ifdef WITH_CONTIKI
memset(&the_coap_context, 0, sizeof(coap_context_t));
initialized = 0;
#endif /* WITH_CONTIKI */
}
int
coap_option_check_critical(coap_context_t *ctx,
coap_pdu_t *pdu,
coap_opt_filter_t unknown) {
coap_opt_iterator_t opt_iter;
int ok = 1;
coap_option_iterator_init(pdu, &opt_iter, COAP_OPT_ALL);
while (coap_option_next(&opt_iter)) {
/* The following condition makes use of the fact that
* coap_option_getb() returns -1 if type exceeds the bit-vector
* filter. As the vector is supposed to be large enough to hold
* the largest known option, we know that everything beyond is
* bad.
*/
if (opt_iter.type & 0x01 &&
coap_option_getb(ctx->known_options, opt_iter.type) < 1) {
debug("unknown critical option %d\n", opt_iter.type);
ok = 0;
/* When opt_iter.type is beyond our known option range,
* coap_option_setb() will return -1 and we are safe to leave
* this loop. */
if (coap_option_setb(unknown, opt_iter.type) == -1)
break;
}
}
return ok;
}
void
coap_transaction_id(const coap_address_t *peer, const coap_pdu_t *pdu,
coap_tid_t *id) {
coap_key_t h;
memset(h, 0, sizeof(coap_key_t));
/* Compare the complete address structure in case of IPv4. For IPv6,
* we need to look at the transport address only. */
#ifdef WITH_POSIX
switch (peer->addr.sa.sa_family) {
case AF_INET:
coap_hash((const unsigned char *)&peer->addr.sa, peer->size, h);
break;
case AF_INET6:
coap_hash((const unsigned char *)&peer->addr.sin6.sin6_port,
sizeof(peer->addr.sin6.sin6_port), h);
coap_hash((const unsigned char *)&peer->addr.sin6.sin6_addr,
sizeof(peer->addr.sin6.sin6_addr), h);
break;
default:
return;
}
#endif
#if defined(WITH_LWIP) || defined(WITH_CONTIKI)
/* FIXME: with lwip, we can do better */
coap_hash((const unsigned char *)&peer->port, sizeof(peer->port), h);
coap_hash((const unsigned char *)&peer->addr, sizeof(peer->addr), h);
#endif /* WITH_LWIP || WITH_CONTIKI */
coap_hash((const unsigned char *)&pdu->hdr->id, sizeof(unsigned short), h);
*id = ((h[0] << 8) | h[1]) ^ ((h[2] << 8) | h[3]);
}
coap_tid_t
coap_send_ack(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *request) {
coap_pdu_t *response;
coap_tid_t result = COAP_INVALID_TID;
if (request && request->hdr->type == COAP_MESSAGE_CON) {
response = coap_pdu_init(COAP_MESSAGE_ACK, 0, request->hdr->id,
sizeof(coap_pdu_t));
if (response) {
result = coap_send(context, dst, response);
coap_delete_pdu(response);
}
}
return result;
}
#ifdef WITH_POSIX
/* releases space allocated by PDU if free_pdu is set */
coap_tid_t
coap_send_impl(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *pdu) {
ssize_t bytes_written;
coap_tid_t id = COAP_INVALID_TID;
if ( !context || !dst || !pdu )
return id;
bytes_written = sendto( context->sockfd, pdu->hdr, pdu->length, 0,
&dst->addr.sa, dst->size);
if (bytes_written >= 0) {
coap_transaction_id(dst, pdu, &id);
} else {
coap_log(LOG_CRIT, "coap_send: sendto\n");
}
return id;
}
#endif /* WITH_POSIX */
#ifdef WITH_CONTIKI
/* releases space allocated by PDU if free_pdu is set */
coap_tid_t
coap_send_impl(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *pdu) {
coap_tid_t id = COAP_INVALID_TID;
if ( !context || !dst || !pdu )
return id;
/* FIXME: is there a way to check if send was successful? */
uip_udp_packet_sendto(context->conn, pdu->hdr, pdu->length,
&dst->addr, dst->port);
coap_transaction_id(dst, pdu, &id);
return id;
}
#endif /* WITH_CONTIKI */
#ifdef WITH_LWIP
coap_tid_t
coap_send_impl(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *pdu) {
coap_tid_t id = COAP_INVALID_TID;
struct pbuf *p;
uint8_t err;
char *data_backup;
if ( !context || !dst || !pdu )
{
return id;
}
data_backup = pdu->data;
/* FIXME: we can't check this here with the existing infrastructure, but we
* should actually check that the pdu is not held by anyone but us. the
* respective pbuf is already exclusively owned by the pdu. */
p = pdu->pbuf;
LWIP_ASSERT("The PDU header is not where it is expected", pdu->hdr == p->payload + sizeof(coap_pdu_t));
err = pbuf_header(p, -sizeof(coap_pdu_t));
if (err)
{
debug("coap_send_impl: pbuf_header failed\n");
pbuf_free(p);
return id;
}
coap_transaction_id(dst, pdu, &id);
pbuf_realloc(p, pdu->length);
udp_sendto(context->pcb, p,
&dst->addr, dst->port);
pbuf_header(p, -(ptrdiff_t)((uint8_t*)pdu - (uint8_t*)p->payload) - sizeof(coap_pdu_t)); /* FIXME hack around udp_sendto not restoring; see http://lists.gnu.org/archive/html/lwip-users/2013-06/msg00008.html. for udp over ip over ethernet, this was -42; as we're doing ppp too, this has to be calculated generically */
err = pbuf_header(p, sizeof(coap_pdu_t));
LWIP_ASSERT("Cannot undo pbuf_header", err == 0);
/* restore destroyed pdu data */
LWIP_ASSERT("PDU not restored", p->payload == pdu);
pdu->max_size = p->tot_len - sizeof(coap_pdu_t); /* reduced after pbuf_realloc */
pdu->hdr = p->payload + sizeof(coap_pdu_t);
pdu->max_delta = 0; /* won't be used any more */
pdu->length = pdu->max_size;
pdu->data = data_backup;
pdu->pbuf = p;
return id;
}
#endif /* WITH_LWIP */
coap_tid_t
coap_send(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *pdu) {
return coap_send_impl(context, dst, pdu);
}
coap_tid_t
coap_send_error(coap_context_t *context,
coap_pdu_t *request,
const coap_address_t *dst,
unsigned char code,
coap_opt_filter_t opts) {
coap_pdu_t *response;
coap_tid_t result = COAP_INVALID_TID;
assert(request);
assert(dst);
response = coap_new_error_response(request, code, opts);
if (response) {
result = coap_send(context, dst, response);
coap_delete_pdu(response);
}
return result;
}
coap_tid_t
coap_send_message_type(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *request,
unsigned char type) {
coap_pdu_t *response;
coap_tid_t result = COAP_INVALID_TID;
if (request) {
response = coap_pdu_init(type, 0, request->hdr->id, sizeof(coap_pdu_t));
if (response) {
result = coap_send(context, dst, response);
coap_delete_pdu(response);
}
}
return result;
}
coap_tid_t
coap_send_confirmed(coap_context_t *context,
const coap_address_t *dst,
coap_pdu_t *pdu) {
coap_queue_t *node;
coap_tick_t now;
int r;
node = coap_new_node();
if (!node) {
debug("coap_send_confirmed: insufficient memory\n");
return COAP_INVALID_TID;
}
node->id = coap_send_impl(context, dst, pdu);
if (COAP_INVALID_TID == node->id) {
debug("coap_send_confirmed: error sending pdu\n");
coap_free_node(node);
return COAP_INVALID_TID;
}
prng((unsigned char *)&r,sizeof(r));
/* add randomized RESPONSE_TIMEOUT to determine retransmission timeout */
node->timeout = COAP_DEFAULT_RESPONSE_TIMEOUT * COAP_TICKS_PER_SECOND +
(COAP_DEFAULT_RESPONSE_TIMEOUT >> 1) *
((COAP_TICKS_PER_SECOND * (r & 0xFF)) >> 8);
memcpy(&node->remote, dst, sizeof(coap_address_t));
node->pdu = pdu;
/* Set timer for pdu retransmission. If this is the first element in
* the retransmission queue, the base time is set to the current
* time and the retransmission time is node->timeout. If there is
* already an entry in the sendqueue, we must check if this node is
* to be retransmitted earlier. Therefore, node->timeout is first
* normalized to the base time and then inserted into the queue with
* an adjusted relative time.
*/
coap_ticks(&now);
if (context->sendqueue == NULL) {
node->t = node->timeout;
context->sendqueue_basetime = now;
} else {
/* make node->t relative to context->sendqueue_basetime */
node->t = (now - context->sendqueue_basetime) + node->timeout;
}
coap_insert_node(&context->sendqueue, node);
#ifdef WITH_LWIP
if (node == context->sendqueue) /* don't bother with timer stuff if there are earlier retransmits */
coap_retransmittimer_restart(context);
#endif
#ifdef WITH_CONTIKI
{ /* (re-)initialize retransmission timer */
coap_queue_t *nextpdu;
nextpdu = coap_peek_next(context);
assert(nextpdu); /* we have just inserted a node */
/* must set timer within the context of the retransmit process */
PROCESS_CONTEXT_BEGIN(&coap_retransmit_process);
etimer_set(&context->retransmit_timer, nextpdu->t);
PROCESS_CONTEXT_END(&coap_retransmit_process);
}
#endif /* WITH_CONTIKI */
return node->id;
}
coap_tid_t
coap_retransmit( coap_context_t *context, coap_queue_t *node ) {
if ( !context || !node )
return COAP_INVALID_TID;
/* re-initialize timeout when maximum number of retransmissions are not reached yet */
if ( node->retransmit_cnt < COAP_DEFAULT_MAX_RETRANSMIT ) {
node->retransmit_cnt++;
node->t = node->timeout << node->retransmit_cnt;
coap_insert_node(&context->sendqueue, node);
#ifdef WITH_LWIP
if (node == context->sendqueue) /* don't bother with timer stuff if there are earlier retransmits */
coap_retransmittimer_restart(context);
#endif
debug("** retransmission #%d of transaction %d\n",
node->retransmit_cnt, ntohs(node->pdu->hdr->id));
node->id = coap_send_impl(context, &node->remote, node->pdu);
return node->id;
}
/* no more retransmissions, remove node from system */
#ifndef WITH_CONTIKI
debug("** removed transaction %d\n", ntohs(node->id));
#endif
#ifndef WITHOUT_OBSERVE
/* Check if subscriptions exist that should be canceled after
COAP_MAX_NOTIFY_FAILURES */
if (node->pdu->hdr->code >= 64) {
str token = { 0, NULL };
token.length = node->pdu->hdr->token_length;
token.s = node->pdu->hdr->token;
coap_handle_failed_notify(context, &node->remote, &token);
}
#endif /* WITHOUT_OBSERVE */
/* And finally delete the node */
coap_delete_node( node );
return COAP_INVALID_TID;
}
/**
* Checks if @p opt fits into the message that ends with @p maxpos.
* This function returns @c 1 on success, or @c 0 if the option @p opt
* would exceed @p maxpos.
*/
static inline int
check_opt_size(coap_opt_t *opt, unsigned char *maxpos) {
if (opt && opt < maxpos) {
if (((*opt & 0x0f) < 0x0f) || (opt + 1 < maxpos))
return opt + COAP_OPT_SIZE(opt) < maxpos;
}
return 0;
}
int
coap_read( coap_context_t *ctx ) {
#ifdef WITH_POSIX
static char buf[COAP_MAX_PDU_SIZE];
#endif
#if defined(WITH_LWIP) || defined(WITH_CONTIKI)
char *buf;
#endif
coap_hdr_t *pdu;
ssize_t bytes_read = -1;
coap_address_t src, dst;
coap_queue_t *node;
#ifdef WITH_CONTIKI
buf = uip_appdata;
#endif /* WITH_CONTIKI */
#ifdef WITH_LWIP
LWIP_ASSERT("No package pending", ctx->pending_package != NULL);
LWIP_ASSERT("Can only deal with contiguous PBUFs to read the initial details", ctx->pending_package->tot_len == ctx->pending_package->len);
buf = ctx->pending_package->payload;
#endif /* WITH_LWIP */
pdu = (coap_hdr_t *)buf;
coap_address_init(&src);
#ifdef WITH_POSIX
bytes_read = recvfrom(ctx->sockfd, buf, sizeof(buf), 0,
&src.addr.sa, &src.size);
#endif /* WITH_POSIX */
#ifdef WITH_CONTIKI
if(uip_newdata()) {
uip_ipaddr_copy(&src.addr, &UIP_IP_BUF->srcipaddr);
src.port = UIP_UDP_BUF->srcport;
uip_ipaddr_copy(&dst.addr, &UIP_IP_BUF->destipaddr);
dst.port = UIP_UDP_BUF->destport;
bytes_read = uip_datalen();
((char *)uip_appdata)[bytes_read] = 0;
PRINTF("Server received %d bytes from [", (int)bytes_read);
PRINT6ADDR(&src.addr);
PRINTF("]:%d\n", uip_ntohs(src.port));
}
#endif /* WITH_CONTIKI */
#ifdef WITH_LWIP
/* FIXME: use lwip address operation functions */
src.addr.addr = ctx->pending_address.addr;
src.port = ctx->pending_port;
bytes_read = ctx->pending_package->tot_len;
#endif /* WITH_LWIP */
if ( bytes_read < 0 ) {
warn("coap_read: recvfrom");
goto error_early;
}
if ( (size_t)bytes_read < sizeof(coap_hdr_t) ) {
debug("coap_read: discarded invalid frame\n" );
goto error_early;
}
if ( pdu->version != COAP_DEFAULT_VERSION ) {
debug("coap_read: unknown protocol version\n" );
goto error_early;
}
node = coap_new_node();
if ( !node )
goto error_early;
#ifdef WITH_LWIP
node->pdu = coap_pdu_from_pbuf(ctx->pending_package);
ctx->pending_package = NULL;
#else
node->pdu = coap_pdu_init(0, 0, 0, bytes_read);
#endif
if (!node->pdu)
goto error;
coap_ticks( &node->t );
memcpy(&node->local, &dst, sizeof(coap_address_t));
memcpy(&node->remote, &src, sizeof(coap_address_t));
if (!coap_pdu_parse((unsigned char *)buf, bytes_read, node->pdu)) {
warn("discard malformed PDU");
goto error;
}
/* and add new node to receive queue */
coap_transaction_id(&node->remote, node->pdu, &node->id);
coap_insert_node(&ctx->recvqueue, node);
#ifndef NDEBUG
if (LOG_DEBUG <= coap_get_log_level()) {
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 40
#endif
unsigned char addr[INET6_ADDRSTRLEN+8];
if (coap_print_addr(&src, addr, INET6_ADDRSTRLEN+8))
debug("** received %d bytes from %s:\n", (int)bytes_read, addr);
coap_show_pdu( node->pdu );
}
#endif
return 0;
error:
/* FIXME: send back RST? */
coap_delete_node(node);
return -1;
error_early:
#ifdef WITH_LWIP
/* even if there was an error, clean up */
pbuf_free(ctx->pending_package);
ctx->pending_package = NULL;
#endif
return -1;
}
int
coap_remove_from_queue(coap_queue_t **queue, coap_tid_t id, coap_queue_t **node) {
coap_queue_t *p, *q;
if ( !queue || !*queue)
return 0;
/* replace queue head if PDU's time is less than head's time */
if ( id == (*queue)->id ) { /* found transaction */
*node = *queue;
*queue = (*queue)->next;
if (*queue) { /* adjust relative time of new queue head */
(*queue)->t += (*node)->t;
}
(*node)->next = NULL;
/* coap_delete_node( q ); */
debug("*** removed transaction %u\n", id);
return 1;
}
/* search transaction to remove (only first occurence will be removed) */
q = *queue;
do {
p = q;
q = q->next;
} while ( q && id != q->id );
if ( q ) { /* found transaction */
p->next = q->next;
if (p->next) { /* must update relative time of p->next */
p->next->t += q->t;
}
q->next = NULL;
*node = q;
/* coap_delete_node( q ); */
debug("*** removed transaction %u\n", id);
return 1;
}
return 0;
}
static inline int
token_match(const unsigned char *a, size_t alen,
const unsigned char *b, size_t blen) {
return alen == blen && (alen == 0 || memcmp(a, b, alen) == 0);
}