contiki/apps/rest-coap/coap-server.c

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#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <ctype.h> /*for isxdigit*/
#include "contiki.h"
#include "contiki-net.h"
#include "buffer.h"
#include "coap-server.h"
#include "rest-util.h"
#include "rest.h" /*added for periodic_resource*/
#include "dev/leds.h"
#if !UIP_CONF_IPV6_RPL
#include "static-routing.h"
#endif
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",(lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3],(lladdr)->addr[4], (lladdr)->addr[5])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#endif
#define MAX_PAYLOAD_LEN 120
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
static struct uip_udp_conn *server_conn;
static uint16_t current_tid;
static service_callback service_cbk = NULL;
void
coap_set_service_callback(service_callback callback)
{
service_cbk = callback;
}
void
parse_message(coap_packet_t* packet, uint8_t* buf, uint16_t size)
{
int processed = 0;
int i = 0;
PRINTF("parse_message size %d-->\n",size);
init_packet(packet);
packet->ver = (buf[0] & COAP_HEADER_VERSION_MASK) >> COAP_HEADER_VERSION_POSITION;
packet->type = (buf[0] & COAP_HEADER_TYPE_MASK) >> COAP_HEADER_TYPE_POSITION;
packet->option_count = buf[0] & COAP_HEADER_OPTION_COUNT_MASK;
packet->code = buf[1];
packet->tid = (buf[2] << 8) + buf[3];
processed += 4;
if (packet->option_count) {
int option_index = 0;
uint8_t option_delta;
uint16_t option_len;
uint8_t* option_buf = buf + processed;
packet->options = (header_option_t*)allocate_buffer(sizeof(header_option_t) * packet->option_count);
if (packet->options) {
header_option_t* current_option = packet->options;
header_option_t* prev_option = NULL;
while(option_index < packet->option_count) {
/*FIXME : put boundary controls*/
option_delta = (option_buf[i] & COAP_HEADER_OPTION_DELTA_MASK) >> COAP_HEADER_OPTION_DELTA_POSITION;
option_len = (option_buf[i] & COAP_HEADER_OPTION_SHORT_LENGTH_MASK);
i++;
if (option_len == 0xf) {
option_len += option_buf[i];
i++;
}
current_option->option = option_delta;
current_option->len = option_len;
current_option->value = option_buf + i;
if (option_index) {
prev_option->next = current_option;
/*This field defines the difference between the option Type of
* this option and the previous option (or zero for the first option)*/
current_option->option += prev_option->option;
}
if (current_option->option == Option_Type_Uri_Path) {
packet->url = (char*)current_option->value;
packet->url_len = current_option->len;
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} else if (current_option->option == Option_Type_Uri_Query){
packet->query = (char*)current_option->value;
packet->query_len = current_option->len;
}
PRINTF("OPTION %d %u %s \n", current_option->option, current_option->len, current_option->value);
i += option_len;
option_index++;
prev_option = current_option++;
}
current_option->next = NULL;
} else {
PRINTF("MEMORY ERROR\n"); /*FIXME : add control here*/
return;
}
}
processed += i;
/**/
if (processed < size) {
packet->payload = &buf[processed];
packet->payload_len = size - processed;
}
/*FIXME url is not decoded - is necessary?*/
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/*If query is not already provided via Uri_Query option then check URL*/
if (packet->url && !packet->query) {
if ((packet->query = strchr(packet->url, '?'))) {
uint16_t total_url_len = packet->url_len;
/*set query len and update url len so that it does not include query part now*/
packet->url_len = packet->query - packet->url;
packet->query++;
packet->query_len = packet->url + total_url_len - packet->query;
PRINTF("url %s, url_len %u, query %s, query_len %u\n", packet->url, packet->url_len, packet->query, packet->query_len);
}
}
PRINTF("PACKET ver:%d type:%d oc:%d \ncode:%d tid:%u url:%s len:%u payload:%s pay_len %u\n", (int)packet->ver, (int)packet->type, (int)packet->option_count, (int)packet->code, packet->tid, packet->url, packet->url_len, packet->payload, packet->payload_len);
}
int
coap_get_query_variable(coap_packet_t* packet, const char *name, char* output, uint16_t output_size)
{
if (packet->query) {
return get_variable(name, packet->query, packet->query_len, output, output_size, 0);
}
return 0;
}
int
coap_get_post_variable(coap_packet_t* packet, const char *name, char* output, uint16_t output_size)
{
if (packet->payload) {
return get_variable(name, packet->payload, packet->payload_len, output, output_size, 1);
}
return 0;
}
static header_option_t*
allocate_header_option(uint16_t variable_len)
{
PRINTF("sizeof header_option_t %u variable size %u\n", sizeof(header_option_t), variable_len);
uint8_t* buffer = allocate_buffer(sizeof(header_option_t) + variable_len);
if (buffer){
header_option_t* option = (header_option_t*) buffer;
option->next = NULL;
option->len = 0;
option->value = buffer + sizeof(header_option_t);
return option;
}
return NULL;
}
/*FIXME : does not overwrite the same option yet.*/
int
coap_set_option(coap_packet_t* packet, option_type option_type, uint16_t len, uint8_t* value)
{
PRINTF("coap_set_option len %u\n", len);
header_option_t* option = allocate_header_option(len);
if (option){
option->next = NULL;
option->len = len;
option->option = option_type;
memcpy(option->value, value, len);
header_option_t* option_current = packet->options;
header_option_t* prev = NULL;
while (option_current){
if (option_current->option > option->option){
break;
}
prev = option_current;
option_current = option_current->next;
}
if (!prev){
if (option_current){
option->next = option_current;
}
packet->options = option;
} else{
option->next = option_current;
prev->next = option;
}
packet->option_count++;
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PRINTF("option->len %u option->option %u option->value %x next %x\n", option->len, option->option, (unsigned int) option->value, (unsigned int)option->next);
int i = 0;
for ( ; i < option->len ; i++ ){
PRINTF(" (%u)", option->value[i]);
}
PRINTF("\n");
return 1;
}
return 0;
}
header_option_t*
coap_get_option(coap_packet_t* packet, option_type option_type)
{
PRINTF("coap_get_option count: %u--> \n", packet->option_count);
int i = 0;
header_option_t* current_option = packet->options;
for (; i < packet->option_count; current_option = current_option->next, i++) {
PRINTF("Current option: %u\n", current_option->option);
if (current_option->option == option_type){
return current_option;
}
}
return NULL;
}
static void
fill_error_packet(coap_packet_t* packet, int error, uint16_t tid)
{
packet->ver=1;
packet->option_count=0;
packet->url=NULL;
packet->options=NULL;
switch (error){
case MEMORY_ALLOC_ERR:
packet->code=INTERNAL_SERVER_ERROR_500;
packet->tid=tid;
packet->type=MESSAGE_TYPE_ACK;
break;
default:
break;
}
}
static void
init_response(coap_packet_t* request, coap_packet_t* response)
{
init_packet(response);
if(request->type == MESSAGE_TYPE_CON) {
response->code = OK_200;
response->tid = request->tid;
response->type = MESSAGE_TYPE_ACK;
}
}
uint16_t
coap_get_payload(coap_packet_t* packet, uint8_t** payload)
{
if (packet->payload) {
*payload = packet->payload;
return packet->payload_len;
} else {
*payload = NULL;
return 0;
}
}
int
coap_set_payload(coap_packet_t* packet, uint8_t* payload, uint16_t size)
{
packet->payload = copy_to_buffer(payload, size);
if (packet->payload) {
packet->payload_len = size;
return 1;
}
return 0;
}
int
coap_set_header_content_type(coap_packet_t* packet, content_type_t content_type)
{
uint16_t len = 1;
return coap_set_option(packet, Option_Type_Content_Type, len, (uint8_t*) &content_type);
}
content_type_t
coap_get_header_content_type(coap_packet_t* packet)
{
header_option_t* option = coap_get_option(packet, Option_Type_Content_Type);
if (option){
return (uint8_t)(*(option->value));
}
return DEFAULT_CONTENT_TYPE;
}
int
coap_get_header_subscription_lifetime(coap_packet_t* packet, uint32_t* lifetime)
{
PRINTF("coap_get_header_subscription_lifetime --> \n");
header_option_t* option = coap_get_option(packet, Option_Type_Subscription_Lifetime);
if (option){
PRINTF("Subs Found len %u (first byte %u)\n", option->len, (uint16_t)option->value[0]);
*lifetime = read_int(option->value, option->len);
return 1;
}
return 0;
}
int
coap_set_header_subscription_lifetime(coap_packet_t* packet, uint32_t lifetime)
{
uint8_t temp[4];
uint16_t len = write_variable_int(temp, lifetime);
return coap_set_option(packet, Option_Type_Subscription_Lifetime, len, temp);
}
int
coap_get_header_block(coap_packet_t* packet, block_option_t* block)
{
uint32_t all_block;
PRINTF("coap_get_header_block --> \n");
header_option_t* option = coap_get_option(packet, Option_Type_Block);
if (option){
PRINTF("Block Found len %u (first byte %u)\n", option->len, (uint16_t)option->value[0]);
all_block = read_int(option->value, option->len);
block->number = all_block >> 4;
block->more = (all_block & 0x8) >> 3;
block->size = (all_block & 0x7);
return 1;
}
return 0;
}
int
coap_set_header_block(coap_packet_t* packet, uint32_t number, uint8_t more, uint8_t size)
{
uint8_t temp[4];
size = log_2(size/16);
number = number << 4;
number |= (more << 3) & 0x8;
number |= size & 0x7;
uint16_t len = write_variable_int(temp, number);
PRINTF("number %lu, more %u, size %u block[0] %u block[1] %u block[2] %u block[3] %u\n",
number, (uint16_t)more, (uint16_t)size, (uint16_t)temp[0], (uint16_t)temp[1], (uint16_t)temp[2], (uint16_t)temp[3]);
return coap_set_option(packet, Option_Type_Block, len, temp);
}
int
coap_set_header_uri(coap_packet_t* packet, char* uri)
{
return coap_set_option(packet, Option_Type_Uri_Path, strlen(uri), (uint8_t*) uri);
}
int
coap_set_header_etag(coap_packet_t* packet, uint8_t* etag, uint8_t size)
{
return coap_set_option(packet, Option_Type_Etag, size, etag);
}
void
coap_set_code(coap_packet_t* packet, status_code_t code)
{
packet->code = (uint8_t)code;
}
coap_method_t
coap_get_method(coap_packet_t* packet)
{
return (coap_method_t)packet->code;
}
void
coap_set_method(coap_packet_t* packet, coap_method_t method)
{
packet->code = (uint8_t)method;
}
static void send_request(coap_packet_t* request, struct uip_udp_conn *client_conn)
{
char buf[MAX_PAYLOAD_LEN];
int data_size = 0;
data_size = serialize_packet(request, buf);
PRINTF("Created a connection with the server ");
PRINT6ADDR(&client_conn->ripaddr);
PRINTF(" local/remote port %u/%u\n",
uip_htons(client_conn->lport), uip_htons(client_conn->rport));
PRINTF("Sending to: ");
PRINT6ADDR(&client_conn->ripaddr);
uip_udp_packet_send(client_conn, buf, data_size);
}
static int
handle_incoming_data(void)
{
int error=NO_ERROR;
char buf[MAX_PAYLOAD_LEN];
PRINTF("uip_datalen received %u \n",(u16_t)uip_datalen());
char* data = uip_appdata + uip_ext_len;
u16_t datalen = uip_datalen() - uip_ext_len;
int data_size = 0;
if (uip_newdata()) {
((char *)data)[datalen] = 0;
PRINTF("Server received: '%s' (port:%u) from ", (char *)data, uip_htons(UIP_UDP_BUF->srcport));
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF("\n");
if (init_buffer(COAP_DATA_BUFF_SIZE)) {
coap_packet_t* request = (coap_packet_t*)allocate_buffer(sizeof(coap_packet_t));
parse_message(request, (uint8_t*)data, datalen);
uip_ipaddr_copy(&request->addr, &UIP_IP_BUF->srcipaddr);
if (request->type != MESSAGE_TYPE_ACK) {
coap_packet_t* response = (coap_packet_t*)allocate_buffer(sizeof(coap_packet_t));
init_response(request, response);
if (service_cbk) {
service_cbk(request, response);
}
data_size = serialize_packet(response, buf);
}
delete_buffer();
} else {
PRINTF("Memory Alloc Error\n");
error = MEMORY_ALLOC_ERR;
/*FIXME : Crappy way of accessing TID of the incoming packet, fix it!*/
coap_packet_t error_packet;
fill_error_packet(&error_packet,error, (data[2] << 8) + data[3]);
data_size = serialize_packet(&error_packet, buf);
}
uip_ipaddr_copy(&server_conn->ripaddr, &UIP_IP_BUF->srcipaddr);
server_conn->rport = UIP_UDP_BUF->srcport;
PRINTF("Responding with message size: %d\n",data_size);
uip_udp_packet_send(server_conn, buf, data_size);
/* Restore server connection to allow data from any node */
memset(&server_conn->ripaddr, 0, sizeof(server_conn->ripaddr));
server_conn->rport = 0;
}
return error;
}
process_event_t resource_changed_event;
void
resource_changed(struct periodic_resource_t* resource)
{
process_post(&coap_server, resource_changed_event, (process_data_t)resource);
}
/*---------------------------------------------------------------------------*/
PROCESS(coap_server, "Coap Server");
PROCESS_THREAD(coap_server, ev, data)
{
PROCESS_BEGIN();
PRINTF("COAP SERVER\n");
/* if static routes are used rather than RPL */
#if !UIP_CONF_IPV6_RPL
set_global_address();
configure_routing();
#endif /*!UIP_CONF_IPV6_RPL*/
current_tid = random_rand();
resource_changed_event = process_alloc_event();
/* new connection with remote host */
server_conn = udp_new(NULL, uip_htons(0), NULL);
udp_bind(server_conn, uip_htons(MOTE_SERVER_LISTEN_PORT));
PRINTF("Local/remote port %u/%u\n", uip_htons(server_conn->lport), uip_htons(server_conn->rport));
while(1) {
PROCESS_YIELD();
if(ev == tcpip_event) {
handle_incoming_data();
} else if (ev == resource_changed_event) {
periodic_resource_t* resource = (periodic_resource_t*)data;
PRINTF("resource_changed_event \n");
if (init_buffer(COAP_DATA_BUFF_SIZE)) {
coap_packet_t* request = (coap_packet_t*)allocate_buffer(sizeof(coap_packet_t));
init_packet(request);
coap_set_code(request, COAP_GET);
request->tid = current_tid++;
coap_set_header_subscription_lifetime(request, resource->lifetime);
coap_set_header_uri(request, (char *)resource->resource->url);
if (resource->periodic_request_generator) {
resource->periodic_request_generator(request);
}
if (!resource->client_conn) {
/*FIXME send port is fixed for now to 61616*/
resource->client_conn = udp_new(&resource->addr, uip_htons(61616), NULL);
udp_bind(resource->client_conn, uip_htons(MOTE_CLIENT_LISTEN_PORT));
}
if (resource->client_conn) {
send_request(request, resource->client_conn);
}
delete_buffer();
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/