blob: d1e01ca21eee38d376408039adc564c215d50d5b [file] [log] [blame]
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <stddef.h>
#include <zephyr/types.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <misc/byteorder.h>
#include <net/buf.h>
#include <net/net_pkt.h>
#include <net/net_ip.h>
#include <net/zoap.h>
struct option_context {
u8_t *buf;
int delta;
int used; /* size used of options */
int buflen;
};
#define COAP_VERSION 1
#define COAP_MARKER 0xFF
#define BASIC_HEADER_SIZE 4
static u8_t coap_option_header_get_delta(u8_t buf)
{
return (buf & 0xF0) >> 4;
}
static u8_t coap_option_header_get_len(u8_t buf)
{
return buf & 0x0F;
}
static void coap_option_header_set_delta(u8_t *buf, u8_t delta)
{
*buf = (delta & 0xF) << 4;
}
static void coap_option_header_set_len(u8_t *buf, u8_t len)
{
*buf |= (len & 0xF);
}
static int decode_delta(int num, const u8_t *buf, s16_t buflen,
u16_t *decoded)
{
int hdrlen = 0;
switch (num) {
case 13:
if (buflen < 1) {
return -EINVAL;
}
num = *buf + 13;
hdrlen += 1;
break;
case 14:
if (buflen < 2) {
return -EINVAL;
}
num = sys_get_be16(buf) + 269;
hdrlen += 2;
break;
case 15:
return -EINVAL;
}
*decoded = num;
return hdrlen;
}
static int coap_parse_option(const struct zoap_packet *zpkt,
struct option_context *context,
u8_t **value, u16_t *vlen)
{
u16_t delta, len;
int r;
if (context->buflen < 1) {
return 0;
}
/* This indicates that options have ended */
if (context->buf[0] == COAP_MARKER) {
return 0;
}
delta = coap_option_header_get_delta(context->buf[0]);
len = coap_option_header_get_len(context->buf[0]);
context->buf += 1;
context->used += 1;
context->buflen -= 1;
/* In case 'delta' doesn't fit the option fixed header. */
r = decode_delta(delta, context->buf, context->buflen, &delta);
if (r < 0) {
return -EINVAL;
}
context->buf += r;
context->used += r;
context->buflen -= r;
/* In case 'len' doesn't fit the option fixed header. */
r = decode_delta(len, context->buf, context->buflen, &len);
if (r < 0) {
return -EINVAL;
}
if (context->buflen < r + len) {
return -EINVAL;
}
if (value) {
*value = context->buf + r;
}
if (vlen) {
*vlen = len;
}
context->buf += r + len;
context->used += r + len;
context->buflen -= r + len;
context->delta += delta;
return context->used;
}
static int coap_parse_options(struct zoap_packet *zpkt, unsigned int offset)
{
struct option_context context = {
.delta = 0,
.used = 0,
.buflen = zpkt->pkt->frags->len - offset,
.buf = &zpkt->pkt->frags->data[offset] };
while (true) {
int r = coap_parse_option(zpkt, &context, NULL, NULL);
if (r < 0) {
return -EINVAL;
}
if (r == 0) {
break;
}
}
return context.used;
}
static u8_t coap_header_get_tkl(const struct zoap_packet *zpkt)
{
return zpkt->pkt->frags->data[0] & 0xF;
}
static int coap_get_header_len(const struct zoap_packet *zpkt)
{
unsigned int hdrlen;
u8_t tkl;
hdrlen = BASIC_HEADER_SIZE;
if (zpkt->pkt->frags->len < hdrlen) {
return -EINVAL;
}
tkl = coap_header_get_tkl(zpkt);
/* Token lenghts 9-15 are reserved. */
if (tkl > 8) {
return -EINVAL;
}
if (zpkt->pkt->frags->len < hdrlen + tkl) {
return -EINVAL;
}
return hdrlen + tkl;
}
int zoap_packet_parse(struct zoap_packet *zpkt, struct net_pkt *pkt)
{
int optlen, hdrlen;
if (!pkt || !pkt->frags) {
return -EINVAL;
}
memset(zpkt, 0, sizeof(*zpkt));
zpkt->pkt = pkt;
hdrlen = coap_get_header_len(zpkt);
if (hdrlen < 0) {
return -EINVAL;
}
optlen = coap_parse_options(zpkt, hdrlen);
if (optlen < 0) {
return -EINVAL;
}
if (pkt->frags->len < hdrlen + optlen) {
return -EINVAL;
}
if (pkt->frags->len <= hdrlen + optlen + 1) {
zpkt->start = NULL;
return 0;
}
zpkt->start = pkt->frags->data + hdrlen + optlen + 1;
zpkt->total_size = pkt->frags->len;
return 0;
}
static int delta_encode(int num, u8_t *value, u8_t *buf, size_t buflen)
{
u16_t v;
if (num < 13) {
*value = num;
return 0;
}
if (num < 269) {
if (buflen < 1) {
return -EINVAL;
}
*value = 13;
*buf = num - 13;
return 1;
}
if (buflen < 2) {
return -EINVAL;
}
*value = 14;
v = sys_cpu_to_be16(num - 269);
memcpy(buf, &v, sizeof(v));
return 2;
}
static int coap_option_encode(struct option_context *context, u16_t code,
const void *value, u16_t len)
{
int delta, offset, r;
u8_t data;
delta = code - context->delta;
offset = 1;
r = delta_encode(delta, &data, context->buf + offset,
context->buflen - offset);
if (r < 0) {
return -EINVAL;
}
offset += r;
coap_option_header_set_delta(context->buf, data);
r = delta_encode(len, &data, context->buf + offset,
context->buflen - offset);
if (r < 0) {
return -EINVAL;
}
offset += r;
coap_option_header_set_len(context->buf, data);
if (context->buflen < offset + len) {
return -EINVAL;
}
memcpy(context->buf + offset, value, len);
return offset + len;
}
int zoap_packet_init(struct zoap_packet *zpkt,
struct net_pkt *pkt)
{
void *data;
if (!pkt || !pkt->frags) {
return -EINVAL;
}
if (net_buf_tailroom(pkt->frags) < BASIC_HEADER_SIZE) {
return -ENOMEM;
}
memset(zpkt, 0, sizeof(*zpkt));
zpkt->total_size = net_buf_tailroom(pkt->frags);
data = net_buf_add(pkt->frags, BASIC_HEADER_SIZE);
/*
* As some header data is built by OR operations, we zero
* the header to be sure.
*/
memset(data, 0, BASIC_HEADER_SIZE);
zpkt->pkt = pkt;
return 0;
}
int zoap_pending_init(struct zoap_pending *pending,
const struct zoap_packet *request,
const struct sockaddr *addr)
{
memset(pending, 0, sizeof(*pending));
pending->id = zoap_header_get_id(request);
memcpy(&pending->addr, addr, sizeof(*addr));
/* Will increase the reference count when the pending is cycled */
pending->pkt = request->pkt;
return 0;
}
struct zoap_pending *zoap_pending_next_unused(
struct zoap_pending *pendings, size_t len)
{
struct zoap_pending *p;
size_t i;
for (i = 0, p = pendings; i < len; i++, p++) {
if (p->timeout == 0 && !p->pkt) {
return p;
}
}
return NULL;
}
struct zoap_reply *zoap_reply_next_unused(
struct zoap_reply *replies, size_t len)
{
struct zoap_reply *r;
size_t i;
for (i = 0, r = replies; i < len; i++, r++) {
if (!r->reply) {
return r;
}
}
return NULL;
}
static inline bool is_addr_unspecified(const struct sockaddr *addr)
{
if (addr->sa_family == AF_UNSPEC) {
return true;
}
if (addr->sa_family == AF_INET6) {
return net_is_ipv6_addr_unspecified(
&(net_sin6(addr)->sin6_addr));
} else if (addr->sa_family == AF_INET) {
return net_sin(addr)->sin_addr.s4_addr32[0] == 0;
}
return false;
}
struct zoap_observer *zoap_observer_next_unused(
struct zoap_observer *observers, size_t len)
{
struct zoap_observer *o;
size_t i;
for (i = 0, o = observers; i < len; i++, o++) {
if (is_addr_unspecified(&o->addr)) {
return o;
}
}
return NULL;
}
struct zoap_pending *zoap_pending_received(
const struct zoap_packet *response,
struct zoap_pending *pendings, size_t len)
{
struct zoap_pending *p;
u16_t resp_id = zoap_header_get_id(response);
size_t i;
for (i = 0, p = pendings; i < len; i++, p++) {
if (!p->timeout) {
continue;
}
if (resp_id != p->id) {
continue;
}
zoap_pending_clear(p);
return p;
}
return NULL;
}
struct zoap_pending *zoap_pending_next_to_expire(
struct zoap_pending *pendings, size_t len)
{
struct zoap_pending *p, *found = NULL;
size_t i;
for (i = 0, p = pendings; i < len; i++, p++) {
if (p->timeout && (!found || found->timeout < p->timeout)) {
found = p;
}
}
return found;
}
#define LAST_TIMEOUT (2345 * 4)
static s32_t next_timeout(s32_t previous)
{
switch (previous) {
case 0:
return 2345;
case 2345:
return 2345 * 2;
case (2345 * 2):
return LAST_TIMEOUT;
case LAST_TIMEOUT:
return LAST_TIMEOUT;
}
return 2345;
}
bool zoap_pending_cycle(struct zoap_pending *pending)
{
s32_t old = pending->timeout;
bool cont;
pending->timeout = next_timeout(pending->timeout);
/* If the timeout changed, it's not the last, continue... */
cont = (old != pending->timeout);
if (cont) {
/*
* When it it is the last retransmission, the buffer
* will be destroyed when it is transmitted.
*/
net_pkt_ref(pending->pkt);
}
return cont;
}
void zoap_pending_clear(struct zoap_pending *pending)
{
pending->timeout = 0;
net_pkt_unref(pending->pkt);
pending->pkt = NULL;
}
static bool uri_path_eq(const struct zoap_packet *zpkt,
const char * const *path)
{
struct zoap_option options[16];
u16_t count = 16;
int i, r;
r = zoap_find_options(zpkt, ZOAP_OPTION_URI_PATH, options, count);
if (r < 0) {
return false;
}
count = r;
for (i = 0; i < count && path[i]; i++) {
size_t len;
len = strlen(path[i]);
if (options[i].len != len) {
return false;
}
if (memcmp(options[i].value, path[i], len)) {
return false;
}
}
return i == count && !path[i];
}
static zoap_method_t method_from_code(const struct zoap_resource *resource,
u8_t code)
{
switch (code) {
case ZOAP_METHOD_GET:
return resource->get;
case ZOAP_METHOD_POST:
return resource->post;
case ZOAP_METHOD_PUT:
return resource->put;
case ZOAP_METHOD_DELETE:
return resource->del;
default:
return NULL;
}
}
static bool is_request(const struct zoap_packet *zpkt)
{
u8_t code = zoap_header_get_code(zpkt);
return !(code & ~ZOAP_REQUEST_MASK);
}
int zoap_handle_request(struct zoap_packet *zpkt,
struct zoap_resource *resources,
const struct sockaddr *from)
{
struct zoap_resource *resource;
if (!is_request(zpkt)) {
return 0;
}
for (resource = resources; resource && resource->path; resource++) {
zoap_method_t method;
u8_t code;
/* FIXME: deal with hierarchical resources */
if (!uri_path_eq(zpkt, resource->path)) {
continue;
}
code = zoap_header_get_code(zpkt);
method = method_from_code(resource, code);
if (!method) {
return 0;
}
return method(resource, zpkt, from);
}
return -ENOENT;
}
unsigned int zoap_option_value_to_int(const struct zoap_option *option)
{
switch (option->len) {
case 0:
return 0;
case 1:
return option->value[0];
case 2:
return (option->value[1] << 0) | (option->value[0] << 8);
case 3:
return (option->value[2] << 0) | (option->value[1] << 8) |
(option->value[0] << 16);
case 4:
return (option->value[2] << 0) | (option->value[2] << 8) |
(option->value[1] << 16) | (option->value[0] << 24);
default:
return 0;
}
return 0;
}
static int get_observe_option(const struct zoap_packet *zpkt)
{
struct zoap_option option = {};
u16_t count = 1;
int r;
r = zoap_find_options(zpkt, ZOAP_OPTION_OBSERVE, &option, count);
if (r <= 0) {
return -ENOENT;
}
return zoap_option_value_to_int(&option);
}
struct zoap_reply *zoap_response_received(
const struct zoap_packet *response,
const struct sockaddr *from,
struct zoap_reply *replies, size_t len)
{
struct zoap_reply *r;
const u8_t *token;
u16_t id;
u8_t tkl;
size_t i;
id = zoap_header_get_id(response);
token = zoap_header_get_token(response, &tkl);
for (i = 0, r = replies; i < len; i++, r++) {
int age;
if ((r->id == 0) && (r->tkl == 0)) {
continue;
}
/* Piggybacked must match id when token is empty */
if ((r->id != id) && (tkl == 0)) {
continue;
}
/* Separate response must only match token */
if (tkl > 0 && memcmp(r->token, token, tkl)) {
continue;
}
age = get_observe_option(response);
if (age > 0) {
/*
* age == 2 means that the notifications wrapped,
* or this is the first one
*/
if (r->age > age && age != 2) {
continue;
}
r->age = age;
}
r->reply(response, r, from);
return r;
}
return NULL;
}
void zoap_reply_init(struct zoap_reply *reply,
const struct zoap_packet *request)
{
const u8_t *token;
u8_t tkl;
int age;
reply->id = zoap_header_get_id(request);
token = zoap_header_get_token(request, &tkl);
if (tkl > 0) {
memcpy(reply->token, token, tkl);
}
reply->tkl = tkl;
age = get_observe_option(request);
/* It means that the request enabled observing a resource */
if (age == 0) {
reply->age = 2;
}
}
void zoap_reply_clear(struct zoap_reply *reply)
{
reply->id = 0;
reply->tkl = 0;
reply->reply = NULL;
}
int zoap_resource_notify(struct zoap_resource *resource)
{
struct zoap_observer *o;
resource->age++;
if (!resource->notify) {
return -ENOENT;
}
SYS_SLIST_FOR_EACH_CONTAINER(&resource->observers, o, list) {
resource->notify(resource, o);
}
return 0;
}
bool zoap_request_is_observe(const struct zoap_packet *request)
{
return get_observe_option(request) == 0;
}
void zoap_observer_init(struct zoap_observer *observer,
const struct zoap_packet *request,
const struct sockaddr *addr)
{
const u8_t *token;
u8_t tkl;
token = zoap_header_get_token(request, &tkl);
if (tkl > 0) {
memcpy(observer->token, token, tkl);
}
observer->tkl = tkl;
net_ipaddr_copy(&observer->addr, addr);
}
bool zoap_register_observer(struct zoap_resource *resource,
struct zoap_observer *observer)
{
bool first;
sys_slist_append(&resource->observers, &observer->list);
first = resource->age == 0;
if (first) {
resource->age = 2;
}
return first;
}
void zoap_remove_observer(struct zoap_resource *resource,
struct zoap_observer *observer)
{
sys_slist_find_and_remove(&resource->observers, &observer->list);
}
static bool sockaddr_equal(const struct sockaddr *a,
const struct sockaddr *b)
{
/*
* FIXME: Should we consider ipv6-mapped ipv4 addresses as equal to
* ipv4 addresses?
*/
if (a->sa_family != b->sa_family) {
return false;
}
if (a->sa_family == AF_INET) {
const struct sockaddr_in *a4 = net_sin(a);
const struct sockaddr_in *b4 = net_sin(b);
if (a4->sin_port != b4->sin_port) {
return false;
}
return net_ipv4_addr_cmp(&a4->sin_addr, &b4->sin_addr);
}
if (b->sa_family == AF_INET6) {
const struct sockaddr_in6 *a6 = net_sin6(a);
const struct sockaddr_in6 *b6 = net_sin6(b);
if (a6->sin6_scope_id != b6->sin6_scope_id) {
return false;
}
if (a6->sin6_port != b6->sin6_port) {
return false;
}
return net_ipv6_addr_cmp(&a6->sin6_addr, &b6->sin6_addr);
}
/* Invalid address family */
return false;
}
struct zoap_observer *zoap_find_observer_by_addr(
struct zoap_observer *observers, size_t len,
const struct sockaddr *addr)
{
size_t i;
for (i = 0; i < len; i++) {
struct zoap_observer *o = &observers[i];
if (sockaddr_equal(&o->addr, addr)) {
return o;
}
}
return NULL;
}
u8_t *zoap_packet_get_payload(struct zoap_packet *zpkt, u16_t *len)
{
u8_t *appdata = zpkt->pkt->frags->data;
u16_t appdatalen = zpkt->pkt->frags->len;
if (!zpkt || !len) {
return NULL;
}
if (!zpkt->start) {
if (appdatalen + 1 >= zpkt->total_size) {
return NULL;
}
appdata[appdatalen] = COAP_MARKER;
zpkt->pkt->frags->len += 1;
zpkt->start = appdata + zpkt->pkt->frags->len;
}
*len = appdata + zpkt->total_size - zpkt->start;
return zpkt->start;
}
int zoap_packet_set_used(struct zoap_packet *zpkt, u16_t len)
{
if ((zpkt->pkt->frags->len + len) >
net_buf_tailroom(zpkt->pkt->frags)) {
return -ENOMEM;
}
zpkt->pkt->frags->len += len;
return 0;
}
int zoap_add_option(struct zoap_packet *zpkt, u16_t code,
const void *value, u16_t len)
{
struct net_buf *frag = zpkt->pkt->frags;
struct option_context context = { .delta = 0,
.used = 0 };
int r, offset;
if (zpkt->start) {
return -EINVAL;
}
offset = coap_get_header_len(zpkt);
if (offset < 0) {
return -EINVAL;
}
/* We check for options in all the 'used' space. */
context.buflen = frag->len - offset;
context.buf = frag->data + offset;
while (context.delta <= code) {
r = coap_parse_option(zpkt, &context, NULL, NULL);
if (r < 0) {
return -ENOENT;
}
if (r == 0) {
break;
}
/* If the new option code is out of order. */
if (code < context.delta) {
return -EINVAL;
}
}
/* We can now add options using all the available space. */
context.buflen = net_buf_tailroom(frag) - (offset + context.used);
r = coap_option_encode(&context, code, value, len);
if (r < 0) {
return -EINVAL;
}
frag->len += r;
return 0;
}
int zoap_add_option_int(struct zoap_packet *zpkt, u16_t code,
unsigned int val)
{
u8_t data[4], len;
if (val == 0) {
data[0] = 0;
len = 0;
} else if (val < 0xFF) {
data[0] = (u8_t) val;
len = 1;
} else if (val < 0xFFFF) {
sys_put_be16(val, data);
len = 2;
} else if (val < 0xFFFFFF) {
sys_put_be16(val, data);
data[2] = val >> 16;
len = 3;
} else {
sys_put_be32(val, data);
len = 4;
}
return zoap_add_option(zpkt, code, data, len);
}
int zoap_find_options(const struct zoap_packet *zpkt, u16_t code,
struct zoap_option *options, u16_t veclen)
{
struct net_buf *frag = zpkt->pkt->frags;
struct option_context context = { .delta = 0,
.used = 0 };
int hdrlen, count = 0;
u16_t len;
hdrlen = coap_get_header_len(zpkt);
if (hdrlen < 0) {
return -EINVAL;
}
context.buflen = frag->len - hdrlen;
context.buf = (u8_t *)frag->data + hdrlen;
while (context.delta <= code && count < veclen) {
int used = coap_parse_option(zpkt, &context,
(u8_t **)&options[count].value,
&len);
options[count].len = len;
if (used < 0) {
return -ENOENT;
}
if (used == 0) {
break;
}
if (code != context.delta) {
continue;
}
count++;
}
return count;
}
u8_t zoap_header_get_version(const struct zoap_packet *zpkt)
{
return (zpkt->pkt->frags->data[0] & 0xC0) >> 6;
}
u8_t zoap_header_get_type(const struct zoap_packet *zpkt)
{
return (zpkt->pkt->frags->data[0] & 0x30) >> 4;
}
u8_t coap_header_get_code(const struct zoap_packet *zpkt)
{
return zpkt->pkt->frags->data[1];
}
const u8_t *zoap_header_get_token(const struct zoap_packet *zpkt,
u8_t *len)
{
struct net_buf *frag = zpkt->pkt->frags;
u8_t tkl = coap_header_get_tkl(zpkt);
if (len) {
*len = 0;
}
if (tkl == 0) {
return NULL;
}
if (len) {
*len = tkl;
}
return (u8_t *)frag->data + BASIC_HEADER_SIZE;
}
u8_t zoap_header_get_code(const struct zoap_packet *zpkt)
{
u8_t code = coap_header_get_code(zpkt);
switch (code) {
/* Methods are encoded in the code field too */
case ZOAP_METHOD_GET:
case ZOAP_METHOD_POST:
case ZOAP_METHOD_PUT:
case ZOAP_METHOD_DELETE:
/* All the defined response codes */
case ZOAP_RESPONSE_CODE_OK:
case ZOAP_RESPONSE_CODE_CREATED:
case ZOAP_RESPONSE_CODE_DELETED:
case ZOAP_RESPONSE_CODE_VALID:
case ZOAP_RESPONSE_CODE_CHANGED:
case ZOAP_RESPONSE_CODE_CONTENT:
case ZOAP_RESPONSE_CODE_CONTINUE:
case ZOAP_RESPONSE_CODE_BAD_REQUEST:
case ZOAP_RESPONSE_CODE_UNAUTHORIZED:
case ZOAP_RESPONSE_CODE_BAD_OPTION:
case ZOAP_RESPONSE_CODE_FORBIDDEN:
case ZOAP_RESPONSE_CODE_NOT_FOUND:
case ZOAP_RESPONSE_CODE_NOT_ALLOWED:
case ZOAP_RESPONSE_CODE_NOT_ACCEPTABLE:
case ZOAP_RESPONSE_CODE_INCOMPLETE:
case ZOAP_RESPONSE_CODE_PRECONDITION_FAILED:
case ZOAP_RESPONSE_CODE_REQUEST_TOO_LARGE:
case ZOAP_RESPONSE_CODE_UNSUPPORTED_CONTENT_FORMAT:
case ZOAP_RESPONSE_CODE_INTERNAL_ERROR:
case ZOAP_RESPONSE_CODE_NOT_IMPLEMENTED:
case ZOAP_RESPONSE_CODE_BAD_GATEWAY:
case ZOAP_RESPONSE_CODE_SERVICE_UNAVAILABLE:
case ZOAP_RESPONSE_CODE_GATEWAY_TIMEOUT:
case ZOAP_RESPONSE_CODE_PROXYING_NOT_SUPPORTED:
case ZOAP_CODE_EMPTY:
return code;
default:
return ZOAP_CODE_EMPTY;
}
}
u16_t zoap_header_get_id(const struct zoap_packet *zpkt)
{
return sys_get_be16(&zpkt->pkt->frags->data[2]);
}
void zoap_header_set_version(struct zoap_packet *zpkt, u8_t ver)
{
zpkt->pkt->frags->data[0] |= (ver & 0x3) << 6;
}
void zoap_header_set_type(struct zoap_packet *zpkt, u8_t type)
{
zpkt->pkt->frags->data[0] |= (type & 0x3) << 4;
}
int zoap_header_set_token(struct zoap_packet *zpkt, const u8_t *token,
u8_t tokenlen)
{
struct net_buf *frag = zpkt->pkt->frags;
u8_t *appdata = frag->data;
if (net_buf_tailroom(frag) < BASIC_HEADER_SIZE + tokenlen) {
return -EINVAL;
}
if (tokenlen > 8) {
return -EINVAL;
}
frag->len += tokenlen;
appdata[0] |= tokenlen & 0xF;
memcpy(frag->data + BASIC_HEADER_SIZE, token, tokenlen);
return 0;
}
void zoap_header_set_code(struct zoap_packet *zpkt, u8_t code)
{
zpkt->pkt->frags->data[1] = code;
}
void zoap_header_set_id(struct zoap_packet *zpkt, u16_t id)
{
sys_put_be16(id, &zpkt->pkt->frags->data[2]);
}
int zoap_block_transfer_init(struct zoap_block_context *ctx,
enum zoap_block_size block_size,
size_t total_size)
{
ctx->block_size = block_size;
ctx->total_size = total_size;
ctx->current = 0;
return 0;
}
#define GET_BLOCK_SIZE(v) (((v) & 0x7))
#define GET_MORE(v) (!!((v) & 0x08))
#define GET_NUM(v) ((v) >> 4)
#define SET_BLOCK_SIZE(v, b) (v |= ((b) & 0x07))
#define SET_MORE(v, m) ((v) |= (m) ? 0x08 : 0x00)
#define SET_NUM(v, n) ((v) |= ((n) << 4))
int zoap_add_block1_option(struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
u16_t bytes = zoap_block_size_to_bytes(ctx->block_size);
unsigned int val = 0;
int r;
if (is_request(zpkt)) {
SET_BLOCK_SIZE(val, ctx->block_size);
SET_MORE(val, ctx->current + bytes < ctx->total_size);
SET_NUM(val, ctx->current / bytes);
} else {
SET_BLOCK_SIZE(val, ctx->block_size);
SET_NUM(val, ctx->current / bytes);
}
r = zoap_add_option_int(zpkt, ZOAP_OPTION_BLOCK1, val);
return r;
}
int zoap_add_block2_option(struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
int r, val = 0;
u16_t bytes = zoap_block_size_to_bytes(ctx->block_size);
if (is_request(zpkt)) {
SET_BLOCK_SIZE(val, ctx->block_size);
SET_NUM(val, ctx->current / bytes);
} else {
SET_BLOCK_SIZE(val, ctx->block_size);
SET_MORE(val, ctx->current + bytes < ctx->total_size);
SET_NUM(val, ctx->current / bytes);
}
r = zoap_add_option_int(zpkt, ZOAP_OPTION_BLOCK2, val);
return r;
}
int zoap_add_size1_option(struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
return zoap_add_option_int(zpkt, ZOAP_OPTION_SIZE1, ctx->total_size);
}
int zoap_add_size2_option(struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
return zoap_add_option_int(zpkt, ZOAP_OPTION_SIZE2, ctx->total_size);
}
static int get_block_option(const struct zoap_packet *zpkt, u16_t code)
{
struct zoap_option option;
unsigned int val;
int count = 1;
count = zoap_find_options(zpkt, code, &option, count);
if (count <= 0) {
return -ENOENT;
}
val = zoap_option_value_to_int(&option);
return val;
}
static int update_descriptive_block(struct zoap_block_context *ctx,
int block, int size)
{
size_t new_current = GET_NUM(block) << (GET_BLOCK_SIZE(block) + 4);
if (block == -ENOENT) {
return 0;
}
if (size && ctx->total_size && ctx->total_size != size) {
return -EINVAL;
}
if (ctx->current > 0 && GET_BLOCK_SIZE(block) > ctx->block_size) {
return -EINVAL;
}
if (ctx->total_size && new_current > ctx->total_size) {
return -EINVAL;
}
if (size) {
ctx->total_size = size;
}
ctx->current = new_current;
ctx->block_size = min(GET_BLOCK_SIZE(block), ctx->block_size);
return 0;
}
static int update_control_block1(struct zoap_block_context *ctx,
int block, int size)
{
size_t new_current = GET_NUM(block) << (GET_BLOCK_SIZE(block) + 4);
if (block == -ENOENT) {
return 0;
}
if (new_current != ctx->current) {
return -EINVAL;
}
if (GET_BLOCK_SIZE(block) > ctx->block_size) {
return -EINVAL;
}
ctx->block_size = GET_BLOCK_SIZE(block);
ctx->total_size = size;
return 0;
}
static int update_control_block2(struct zoap_block_context *ctx,
int block, int size)
{
size_t new_current = GET_NUM(block) << (GET_BLOCK_SIZE(block) + 4);
if (block == -ENOENT) {
return 0;
}
if (GET_MORE(block)) {
return -EINVAL;
}
if (GET_NUM(block) > 0 && GET_BLOCK_SIZE(block) != ctx->block_size) {
return -EINVAL;
}
ctx->current = new_current;
ctx->block_size = min(GET_BLOCK_SIZE(block), ctx->block_size);
return 0;
}
int zoap_update_from_block(const struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
int r, block1, block2, size1, size2;
block1 = get_block_option(zpkt, ZOAP_OPTION_BLOCK1);
block2 = get_block_option(zpkt, ZOAP_OPTION_BLOCK2);
size1 = get_block_option(zpkt, ZOAP_OPTION_SIZE1);
size2 = get_block_option(zpkt, ZOAP_OPTION_SIZE2);
size1 = size1 == -ENOENT ? 0 : size1;
size2 = size2 == -ENOENT ? 0 : size2;
if (is_request(zpkt)) {
r = update_control_block2(ctx, block2, size2);
if (r) {
return r;
}
return update_descriptive_block(ctx, block1, size1);
}
r = update_control_block1(ctx, block1, size1);
if (r) {
return r;
}
return update_descriptive_block(ctx, block2, size2);
}
size_t zoap_next_block(const struct zoap_packet *zpkt,
struct zoap_block_context *ctx)
{
int block;
if (is_request(zpkt)) {
block = get_block_option(zpkt, ZOAP_OPTION_BLOCK1);
} else {
block = get_block_option(zpkt, ZOAP_OPTION_BLOCK2);
}
if (!GET_MORE(block)) {
return 0;
}
ctx->current += zoap_block_size_to_bytes(ctx->block_size);
return ctx->current;
}
u8_t *zoap_next_token(void)
{
static u32_t rand[2];
rand[0] = sys_rand32_get();
rand[1] = sys_rand32_get();
return (u8_t *) rand;
}