resource/csdk/occoap/src/occoap.c

   1 //******************************************************************
   2 //
   3 // Copyright 2014 Intel Mobile Communications GmbH All Rights Reserved.
   4 //
   5 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
   6 //
   7 // Licensed under the Apache License, Version 2.0 (the "License");
   8 // you may not use this file except in compliance with the License.
   9 // You may obtain a copy of the License at
  10 //
  11 //      http://www.apache.org/licenses/LICENSE-2.0
  12 //
  13 // Unless required by applicable law or agreed to in writing, software
  14 // distributed under the License is distributed on an "AS IS" BASIS,
  15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 // See the License for the specific language governing permissions and
  17 // limitations under the License.
  18 //
  19 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  20
  21
  22 //=============================================================================
  23 // Includes
  24 //=============================================================================
  25 #define _POSIX_C_SOURCE 200112L
  26 #include <string.h>
  27 #include "occoap.h"
  28 #include "ocstackconfig.h"
  29 #include "occlientcb.h"
  30 #include "ocobserve.h"
  31 #include "logger.h"
  32 #include "ocmalloc.h"
  33 #include <coap.h>
  34
  35 #ifndef WITH_ARDUINO
  36 #include <unistd.h>
  37 #endif
  38 #include <limits.h>
  39 #include <ctype.h>
  40
  41 //=============================================================================
  42 // Macros
  43 //=============================================================================
  44 #define TAG    PCF("OCCoAP")
  45 #define VERIFY_SUCCESS(op, successCode) { if (op != successCode) \
  46             {OC_LOG_V(FATAL, TAG, "%s failed!!", #op); goto exit;} }
  47 #define VERIFY_NON_NULL(arg) { if (!arg) {OC_LOG_V(FATAL, TAG, "%s is NULL", #arg); goto exit;} }
  48
  49 //=============================================================================
  50 // Defines
  51 //=============================================================================
  52 #define COAP_BLOCK_FILL_VALUE   (0xFF)
  53
  54 //=============================================================================
  55 // Private Variables
  56 //=============================================================================
  57
  58 static coap_context_t *gCoAPCtx = NULL;
  59
  60 //=============================================================================
  61 // Helper Functions
  62 //=============================================================================
  63
  64 //generate a coap token
  65 void OCGenerateCoAPToken(OCCoAPToken * token)
  66 {
  67     if (token)
  68     {
  69         token->tokenLength = MAX_TOKEN_LENGTH;
  70         OCFillRandomMem((uint8_t*)token->token, token->tokenLength);
  71     }
  72 }
  73
  74 //This function is called back by libcoap when ack or rst are received
  75 static void HandleCoAPAckRst(struct coap_context_t * ctx, uint8_t msgType,
  76         const coap_queue_t * sentQueue){
  77
  78     // silence warnings
  79     (void) ctx;
  80     coap_pdu_t * sentPdu = sentQueue->pdu;
  81     OCStackResult result = OC_STACK_ERROR;
  82     uint32_t observationOption = OC_OBSERVE_NO_OPTION;
  83     // {{0}} to eliminate warning for known compiler bug 53119
  84     // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119
  85     OCCoAPToken sentToken = {{0}};
  86
  87     result = ParseCoAPPdu(sentPdu, NULL, NULL, &observationOption, NULL, NULL, NULL,
  88             NULL, NULL, NULL, NULL, NULL);
  89     VERIFY_SUCCESS(result, OC_STACK_OK);
  90
  91     // fill OCCoAPToken structure
  92     RetrieveOCCoAPToken(sentPdu, &sentToken);
  93
  94     if(msgType == COAP_MESSAGE_RST)
  95     {
  96         if(myStackMode != OC_CLIENT)
  97         {
  98             result = OCStackFeedBack(&sentToken, OC_OBSERVER_NOT_INTERESTED);
  99             if(result == OC_STACK_OK)
 100             {
 101                 OC_LOG_V(DEBUG, TAG,
 102                         "Received RST, removing all queues associated with Token %d bytes",
 103                         sentToken.tokenLength);
 104                 OC_LOG_BUFFER(INFO, TAG, sentToken.token, sentToken.tokenLength);
 105                 coap_cancel_all_messages(ctx, &sentQueue->remote, sentToken.token,
 106                         sentToken.tokenLength);
 107             }
 108         }
 109     }
 110     else if(observationOption != OC_OBSERVE_NO_OPTION && msgType == COAP_MESSAGE_ACK)
 111     {
 112         OC_LOG_V(DEBUG, TAG, "Received ACK, for Token %d bytes",sentToken.tokenLength);
 113         OC_LOG_BUFFER(INFO, TAG, sentToken.token, sentToken.tokenLength);
 114         // now the observer is still interested
 115         if(myStackMode != OC_CLIENT)
 116         {
 117             OCStackFeedBack(&sentToken, OC_OBSERVER_STILL_INTERESTED);
 118         }
 119     }
 120 exit:
 121     return;
 122 }
 123
 124 //This function is called back by libcoap when a request is received
 125 static void HandleCoAPRequests(struct coap_context_t *ctx,
 126         const coap_queue_t * rcvdRequest)
 127 {
 128     // silence warnings
 129     (void) ctx;
 130     OCServerProtocolRequest protocolRequest = {(OCMethod)0};
 131     coap_block_t rcvdBlock1;
 132     coap_block_t rcvdBlock2;
 133     memset(&rcvdBlock1, COAP_BLOCK_FILL_VALUE, sizeof(coap_block_t));
 134     memset(&rcvdBlock2, COAP_BLOCK_FILL_VALUE, sizeof(coap_block_t));
 135     uint16_t rcvdSize1 = 0;
 136     coap_pdu_t * rcvdPdu = rcvdRequest->pdu;
 137     coap_pdu_t * sendPdu = NULL;
 138     coap_send_flags_t sendFlag;
 139     OCStackResult result = OC_STACK_ERROR;
 140     OCStackResult requestResult = OC_STACK_ERROR;
 141
 142     if(myStackMode == OC_CLIENT)
 143     {
 144         //TODO: should the client be responding to requests?
 145         return;
 146     }
 147
 148     protocolRequest.observationOption = OC_OBSERVE_NO_OPTION;
 149     protocolRequest.qos = (rcvdPdu->hdr->type == COAP_MESSAGE_CON) ?
 150             OC_HIGH_QOS : OC_LOW_QOS;
 151     protocolRequest.coapID = rcvdPdu->hdr->id;
 152     protocolRequest.delayedResNeeded = rcvdRequest->delayedResNeeded;
 153     protocolRequest.secured = rcvdRequest->secure;
 154
 155     // fill OCCoAPToken structure
 156     RetrieveOCCoAPToken(rcvdPdu, &protocolRequest.requestToken);
 157     OC_LOG_V(INFO, TAG, " Token received %d bytes",
 158             protocolRequest.requestToken.tokenLength);
 159     OC_LOG_BUFFER(INFO, TAG, protocolRequest.requestToken.token,
 160             protocolRequest.requestToken.tokenLength);
 161
 162     // fill OCDevAddr
 163     memcpy(&protocolRequest.requesterAddr, (OCDevAddr *) &rcvdRequest->remote,
 164             sizeof(OCDevAddr));
 165
 166     // Retrieve Uri and Query from received coap pdu
 167     result =  ParseCoAPPdu(rcvdPdu, protocolRequest.resourceUrl,
 168             protocolRequest.query,
 169             &(protocolRequest.observationOption), NULL,
 170             &(protocolRequest.numRcvdVendorSpecificHeaderOptions),
 171             protocolRequest.rcvdVendorSpecificHeaderOptions,
 172             &rcvdBlock1, &rcvdBlock2, &rcvdSize1, NULL,
 173             protocolRequest.reqJSONPayload);
 174     VERIFY_SUCCESS(result, OC_STACK_OK);
 175
 176     switch (rcvdPdu->hdr->code)
 177     {
 178         case COAP_REQUEST_GET:
 179         {
 180             protocolRequest.method = OC_REST_GET;
 181             break;
 182         }
 183         case COAP_REQUEST_POST:
 184         {
 185             protocolRequest.method = OC_REST_POST;
 186             break;
 187         }
 188         case COAP_REQUEST_DELETE:
 189         {
 190             protocolRequest.method = OC_REST_DELETE;
 191             break;
 192         }
 193         case COAP_REQUEST_PUT:
 194         {
 195             protocolRequest.method = OC_REST_PUT;
 196             break;
 197         }
 198         default:
 199         {
 200             OC_LOG_V(ERROR, TAG, "Received CoAP method %d not supported",
 201                     rcvdPdu->hdr->code);
 202             goto exit;
 203         }
 204     }
 205
 206     if(rcvdBlock1.szx != 7)
 207     {
 208         protocolRequest.reqPacketSize = 1 << (rcvdBlock1.szx + 4);
 209         protocolRequest.reqMorePacket = rcvdBlock1.m;
 210         protocolRequest.reqPacketNum  = rcvdBlock1.num;
 211     }
 212     else
 213     {
 214         // No block1 received
 215         rcvdSize1 = strlen((const char *)protocolRequest.reqJSONPayload)+1;
 216         protocolRequest.reqTotalSize = rcvdSize1;
 217     }
 218
 219     if(rcvdBlock2.szx != 7)
 220     {
 221         protocolRequest.resPacketSize = 1 << (rcvdBlock2.szx + 4);
 222         protocolRequest.resPacketNum  = rcvdBlock2.num;
 223     }
 224
 225     requestResult = HandleStackRequests(&protocolRequest);
 226
 227     if(requestResult == OC_STACK_VIRTUAL_DO_NOT_HANDLE ||
 228             requestResult == OC_STACK_OK ||
 229             requestResult == OC_STACK_RESOURCE_CREATED ||
 230             requestResult == OC_STACK_RESOURCE_DELETED ||
 231             requestResult == OC_STACK_INVALID_DEVICE_INFO)
 232     {
 233         goto exit;
 234     }
 235     else if(requestResult == OC_STACK_NO_MEMORY ||
 236             requestResult == OC_STACK_ERROR ||
 237             requestResult == OC_STACK_NOTIMPL ||
 238             requestResult == OC_STACK_NO_RESOURCE ||
 239             requestResult == OC_STACK_RESOURCE_ERROR)
 240     {
 241         // TODO: should we send an error also when we receive a non-secured request to a secure resource?
 242         // TODO: should we consider some sort of error response
 243         OC_LOG(DEBUG, TAG, PCF("We should send some sort of error message"));
 244         // generate the pdu, if the request was CON, then the response is ACK, otherwire NON
 245         sendPdu = GenerateCoAPPdu((rcvdPdu->hdr->type == COAP_MESSAGE_CON)? COAP_MESSAGE_ACK : COAP_MESSAGE_NON,
 246                 OCToCoAPResponseCode(requestResult), rcvdPdu->hdr->id,
 247                 &protocolRequest.requestToken, NULL, NULL);
 248         VERIFY_NON_NULL(sendPdu);
 249         coap_show_pdu(sendPdu);
 250         sendFlag = (coap_send_flags_t)(rcvdRequest->secure ? SEND_SECURE_PORT : 0);
 251         if(SendCoAPPdu(gCoAPCtx, (coap_address_t*) &(rcvdRequest->remote), sendPdu,
 252                 sendFlag)
 253                 != OC_STACK_OK){
 254             OC_LOG(DEBUG, TAG, PCF("A problem occurred in sending a pdu"));
 255         }
 256         goto exit;
 257     }
 258     else if(requestResult == OC_STACK_SLOW_RESOURCE ||
 259             requestResult == OC_STACK_DUPLICATE_REQUEST)
 260     {
 261         if(rcvdPdu->hdr->type == COAP_MESSAGE_CON)
 262         {
 263             // generate the pdu, if the request was CON, then the response is ACK, otherwire NON
 264             sendPdu = GenerateCoAPPdu(COAP_MESSAGE_ACK, 0, rcvdPdu->hdr->id,
 265                     NULL, NULL, NULL);
 266             VERIFY_NON_NULL(sendPdu);
 267             coap_show_pdu(sendPdu);
 268
 269             sendFlag = (coap_send_flags_t)(rcvdRequest->secure ? SEND_SECURE_PORT : 0);
 270             if(SendCoAPPdu(gCoAPCtx, (coap_address_t*) &(rcvdRequest->remote), sendPdu,
 271                     sendFlag)
 272                     != OC_STACK_OK){
 273                 OC_LOG(DEBUG, TAG, PCF("A problem occurred in sending a pdu"));
 274             }
 275         }
 276         else
 277         {
 278             goto exit;
 279         }
 280     }
 281 exit:
 282     return;
 283 }
 284
 285 uint32_t GetTime(float afterSeconds)
 286 {
 287     coap_tick_t now;
 288     coap_ticks(&now);
 289     return now + (uint32_t)(afterSeconds * COAP_TICKS_PER_SECOND);
 290 }
 291
 292 //This function is called back by libcoap when a response is received
 293 static void HandleCoAPResponses(struct coap_context_t *ctx,
 294         const coap_queue_t * rcvdResponse) {
 295     OCResponse * response = NULL;
 296     OCCoAPToken rcvdToken;
 297     OCClientResponse clientResponse = {0};
 298     ClientCB * cbNode = NULL;
 299     unsigned char bufRes[MAX_RESPONSE_LENGTH] = {0};
 300     uint32_t sequenceNumber = OC_OBSERVE_NO_OPTION;
 301     uint32_t maxAge = 0;
 302     OCStackResult result = OC_STACK_ERROR;
 303     coap_pdu_t * sendPdu = NULL;
 304     coap_pdu_t * recvPdu = NULL;
 305     unsigned char rcvdUri[MAX_URI_LENGTH] = { 0 };
 306     uint8_t isObserveNotification = 0;
 307     #ifdef WITH_PRESENCE
 308     char * resourceTypeName = NULL;
 309     uint8_t remoteIpAddr[4];
 310     uint16_t remotePortNu;
 311     unsigned char fullUri[MAX_URI_LENGTH] = { 0 };
 312     uint8_t isPresenceNotification = 0;
 313     uint8_t isMulticastPresence = 0;
 314     uint32_t lowerBound;
 315     uint32_t higherBound;
 316     char * tok = NULL;
 317     #endif
 318     coap_block_t rcvdBlock1 = {COAP_BLOCK_FILL_VALUE};
 319     coap_block_t rcvdBlock2 = {COAP_BLOCK_FILL_VALUE};
 320     uint16_t rcvdSize2 = 0;
 321
 322     VERIFY_NON_NULL(ctx);
 323     VERIFY_NON_NULL(rcvdResponse);
 324     recvPdu = rcvdResponse->pdu;
 325
 326     result = ParseCoAPPdu(recvPdu, rcvdUri, NULL, &sequenceNumber, &maxAge,
 327             &clientResponse.numRcvdVendorSpecificHeaderOptions,
 328             clientResponse.rcvdVendorSpecificHeaderOptions,
 329             &rcvdBlock1, &rcvdBlock2, NULL, &rcvdSize2, bufRes);
 330
 331     VERIFY_SUCCESS(result, OC_STACK_OK);
 332
 333     OC_LOG_V(DEBUG, TAG, "The sequenceNumber/NONCE of this response %u", sequenceNumber);
 334     OC_LOG_V(DEBUG, TAG, "The maxAge/TTL of this response %u", maxAge);
 335     OC_LOG_V(DEBUG, TAG, "The response received is %s", bufRes);
 336
 337     if(sequenceNumber >= OC_OFFSET_SEQUENCE_NUMBER)
 338     {
 339         isObserveNotification = 1;
 340         OC_LOG(INFO, TAG, PCF("Received an observe notification"));
 341     }
 342
 343     #ifdef WITH_PRESENCE
 344     if(!strcmp((char *)rcvdUri, (char *)OC_PRESENCE_URI)){
 345         char* tokSavePtr;
 346
 347         isPresenceNotification = 1;
 348         OC_LOG(INFO, TAG, PCF("Received a presence notification"));
 349         tok = strtok_r((char *)bufRes, "[:]}", &tokSavePtr);
 350         bufRes[strlen((char *)bufRes)] = ':';
 351         tok = strtok_r(NULL, "[:]}", &tokSavePtr);
 352         bufRes[strlen((char *)bufRes)] = ':';
 353         VERIFY_NON_NULL(tok);
 354         sequenceNumber = (uint32_t )atol(tok);
 355         OC_LOG_V(DEBUG, TAG, "The received NONCE is %u", sequenceNumber);
 356         tok = strtok_r(NULL, "[:]}", &tokSavePtr);
 357         VERIFY_NON_NULL(tok);
 358         maxAge = (uint32_t )atol(tok);
 359         OC_LOG_V(DEBUG, TAG, "The received TTL is %u", maxAge);
 360         tok = strtok_r(NULL, "[:]}", &tokSavePtr);
 361         if(tok) {
 362             bufRes[strlen((char *)bufRes)] = ':';
 363             resourceTypeName = (char *)OCMalloc(strlen(tok));
 364             if(!resourceTypeName)
 365             {
 366                 goto exit;
 367             }
 368             strcpy(resourceTypeName, tok);
 369             OC_LOG_V(DEBUG, TAG, "----------------resourceTypeName %s",
 370                     resourceTypeName);
 371         }
 372         bufRes[strlen((char *)bufRes)] = ']';
 373     }
 374     #endif
 375
 376     // fill OCCoAPToken structure
 377     RetrieveOCCoAPToken(recvPdu, &rcvdToken);
 378     OC_LOG_V(INFO, TAG,"Received a pdu with Token", rcvdToken.tokenLength);
 379     OC_LOG_BUFFER(INFO, TAG, rcvdToken.token, rcvdToken.tokenLength);
 380
 381     // fill OCClientResponse structure
 382     result = FormOCClientResponse(&clientResponse, CoAPToOCResponseCode(recvPdu->hdr->code),
 383             (OCDevAddr *) &(rcvdResponse->remote), sequenceNumber, bufRes);
 384     VERIFY_SUCCESS(result, OC_STACK_OK);
 385
 386     cbNode = GetClientCB(&rcvdToken, NULL, NULL);
 387
 388     #ifdef WITH_PRESENCE
 389     // Check if the application subscribed for presence
 390     if(!cbNode)
 391     {
 392         // get the address of the remote
 393         OCDevAddrToIPv4Addr((OCDevAddr *) &(rcvdResponse->remote), remoteIpAddr,
 394                 remoteIpAddr + 1, remoteIpAddr + 2, remoteIpAddr + 3);
 395         OCDevAddrToPort((OCDevAddr *) &(rcvdResponse->remote), &remotePortNu);
 396         snprintf((char *)fullUri, sizeof(fullUri), "coap://%d.%d.%d.%d:%d%s",
 397                 remoteIpAddr[0],remoteIpAddr[1],remoteIpAddr[2],remoteIpAddr[3],
 398                 remotePortNu,rcvdUri);
 399         cbNode = GetClientCB(NULL, NULL, fullUri);
 400     }
 401
 402     // Check if application subscribed for multicast presence
 403     if(!cbNode)
 404     {
 405         snprintf((char *)fullUri, sizeof(fullUri), "%s%s", OC_MULTICAST_IP, rcvdUri);
 406         cbNode = GetClientCB(NULL, NULL, fullUri);
 407         isMulticastPresence = 1;
 408         isPresenceNotification = 0;
 409     }
 410     #endif
 411
 412     // fill OCResponse structure
 413     result = FormOCResponse(&response, cbNode, maxAge, &clientResponse);
 414     VERIFY_SUCCESS(result, OC_STACK_OK);
 415
 416     if(cbNode)
 417     {
 418         if(!isObserveNotification)
 419         {
 420             #ifdef WITH_PRESENCE
 421             if(!isPresenceNotification)
 422             {
 423             #endif
 424                 OC_LOG(INFO, TAG, PCF("Received a regular response"));
 425                 if(recvPdu->hdr->type == COAP_MESSAGE_CON)
 426                 {
 427                     sendPdu = GenerateCoAPPdu(COAP_MESSAGE_ACK, 0,
 428                             recvPdu->hdr->id, NULL, NULL, NULL);
 429                     VERIFY_NON_NULL(sendPdu);
 430                     result = SendCoAPPdu(gCoAPCtx, (coap_address_t*) &rcvdResponse->remote,
 431                             sendPdu,
 432                             (coap_send_flags_t)(rcvdResponse->secure ? SEND_SECURE_PORT : 0));
 433                 }
 434             #ifdef WITH_PRESENCE
 435             }
 436             #endif
 437         }
 438         if(isObserveNotification)
 439         {
 440             OC_LOG(INFO, TAG, PCF("Received an observe notification"));
 441             if(recvPdu->hdr->type == COAP_MESSAGE_CON)
 442             {
 443                 sendPdu = GenerateCoAPPdu(COAP_MESSAGE_ACK, 0,
 444                         recvPdu->hdr->id, NULL, NULL, NULL);
 445                 VERIFY_NON_NULL(sendPdu);
 446                 result = SendCoAPPdu(gCoAPCtx, (coap_address_t*) &rcvdResponse->remote,
 447                         sendPdu,
 448                         (coap_send_flags_t)(rcvdResponse->secure ? SEND_SECURE_PORT : 0));
 449             }
 450             //TODO: check the standard for methods to detect wrap around condition
 451             if(cbNode->method == OC_REST_OBSERVE &&
 452                     (clientResponse.sequenceNumber <= cbNode->sequenceNumber ||
 453                             (clientResponse.sequenceNumber > cbNode->sequenceNumber &&
 454                                     clientResponse.sequenceNumber == (MAX_SEQUENCE_NUMBER))))
 455             {
 456                 OC_LOG_V(DEBUG, TAG, "Observe notification came out of order. \
 457                         Ignoring Incoming:%d  Against Current:%d.",
 458                         clientResponse.sequenceNumber, cbNode->sequenceNumber);
 459                 goto exit;
 460             }
 461             if(clientResponse.sequenceNumber > cbNode->sequenceNumber){
 462                 cbNode->sequenceNumber = clientResponse.sequenceNumber;
 463             }
 464         }
 465         else
 466         {
 467             #ifdef WITH_PRESENCE
 468             if(isPresenceNotification)
 469             {
 470                 OC_LOG(INFO, TAG, PCF("Received a presence notification"));
 471                 if(!cbNode->presence)
 472                 {
 473                     cbNode->presence = (OCPresence *) OCMalloc(sizeof(OCPresence));
 474                     VERIFY_NON_NULL(cbNode->presence);
 475                     cbNode->presence->timeOut = NULL;
 476                     cbNode->presence->timeOut = (uint32_t *)
 477                             OCMalloc(PresenceTimeOutSize * sizeof(uint32_t));
 478                     if(!(cbNode->presence->timeOut)){
 479                         OCFree(cbNode->presence);
 480                         goto exit;
 481                     }
 482                 }
 483                 if(maxAge == 0)
 484                 {
 485                     OC_LOG(INFO, TAG, PCF("===============Stopping presence"));
 486                     response->clientResponse->result = OC_STACK_PRESENCE_STOPPED;
 487                     if(cbNode->presence)
 488                     {
 489                         OCFree(cbNode->presence->timeOut);
 490                         OCFree(cbNode->presence);
 491                         cbNode->presence = NULL;
 492                     }
 493                 }
 494                 else
 495                 {
 496                     OC_LOG_V(INFO, TAG, "===============Update presence TTL, now time is %d", GetTime(0));
 497                     cbNode->presence->TTL = maxAge;
 498                     for(int index = 0; index < PresenceTimeOutSize; index++)
 499                     {
 500                         lowerBound = GetTime(((float)(PresenceTimeOut[index])
 501                                 /(float)100)*(float)cbNode->presence->TTL);
 502                         higherBound = GetTime(((float)(PresenceTimeOut[index + 1])
 503                                 /(float)100)*(float)cbNode->presence->TTL);
 504                         cbNode->presence->timeOut[index] = OCGetRandomRange(lowerBound, higherBound);
 505                         OC_LOG_V(DEBUG, TAG, "----------------lowerBound timeout  %d", lowerBound);
 506                         OC_LOG_V(DEBUG, TAG, "----------------higherBound timeout %d", higherBound);
 507                         OC_LOG_V(DEBUG, TAG, "----------------timeOut entry  %d", cbNode->presence->timeOut[index]);
 508                     }
 509                     cbNode->presence->TTLlevel = 0;
 510                     OC_LOG_V(DEBUG, TAG, "----------------this TTL level %d", cbNode->presence->TTLlevel);
 511                     if(cbNode->sequenceNumber == clientResponse.sequenceNumber)
 512                     {
 513                         OC_LOG(INFO, TAG, PCF("===============No presence change"));
 514                         goto exit;
 515                     }
 516                     OC_LOG(INFO, TAG, PCF("===============Presence changed, calling up the stack"));
 517                     cbNode->sequenceNumber = clientResponse.sequenceNumber;;
 518                 }
 519
 520                 // Ensure that a filter is actually applied.
 521                 if(resourceTypeName && response->cbNode->filterResourceType)
 522                 {
 523                     if(!findResourceType(response->cbNode->filterResourceType, resourceTypeName))
 524                     {
 525                         goto exit;
 526                     }
 527                 }
 528             }
 529             else if(isMulticastPresence)
 530             {
 531                 // Check if the same nonce for a given host
 532                 OCMulticastNode* mcNode = NULL;
 533                 unsigned char senderUri[MAX_URI_LENGTH] = { 0 };
 534                 snprintf((char *)senderUri, sizeof(senderUri), "%d.%d.%d.%d:%d",
 535                     remoteIpAddr[0],remoteIpAddr[1],remoteIpAddr[2],remoteIpAddr[3],
 536                     remotePortNu);
 537                 mcNode = GetMCPresenceNode(senderUri);
 538
 539                 if(maxAge == 0)
 540                 {
 541                     OC_LOG(INFO, TAG, PCF("===============Stopping presence"));
 542                     response->clientResponse->result = OC_STACK_PRESENCE_STOPPED;
 543                     if(cbNode->presence)
 544                     {
 545                         OCFree(cbNode->presence->timeOut);
 546                         OCFree(cbNode->presence);
 547                         cbNode->presence = NULL;
 548                     }
 549                 }
 550                 else if(mcNode != NULL)
 551                 {
 552                     if(mcNode->nonce == clientResponse.sequenceNumber)
 553                     {
 554                         OC_LOG(INFO, TAG, PCF("===============No presence change (Multicast)"));
 555                         goto exit;
 556                     }
 557                     mcNode->nonce = clientResponse.sequenceNumber;
 558                 }
 559                 else
 560                 {
 561                     uint32_t uriLen = strlen((char*)senderUri);
 562                     unsigned char* uri = (unsigned char *) OCMalloc(uriLen + 1);
 563                     if(uri)
 564                     {
 565                         memcpy(uri, senderUri, (uriLen + 1));
 566                     }
 567                     else
 568                     {
 569                         OC_LOG(INFO, TAG,
 570                             PCF("===============No Memory for URI to store in the presence node"));
 571                         goto exit;
 572                     }
 573                     result = AddMCPresenceNode(&mcNode, (unsigned char*) uri,
 574                                                 clientResponse.sequenceNumber);
 575                     if(result == OC_STACK_NO_MEMORY)
 576                     {
 577                         OC_LOG(INFO, TAG,
 578                             PCF("===============No Memory for Multicast Presence Node"));
 579                         goto exit;
 580                     }
 581                 }
 582
 583                 // Ensure that a filter is actually applied.
 584                 if(resourceTypeName && response->cbNode->filterResourceType)
 585                 {
 586                     if(!findResourceType(response->cbNode->filterResourceType, resourceTypeName))
 587                     {
 588                         goto exit;
 589                     }
 590                 }
 591             }
 592             #endif
 593         }
 594         HandleStackResponses(response);
 595     }
 596     else if(!cbNode && isObserveNotification)
 597     {
 598         OC_LOG(INFO, TAG, PCF("Received an observe notification, but I do not have callback \
 599                  ------------ sending RESET"));
 600         sendPdu = GenerateCoAPPdu(COAP_MESSAGE_RST, 0,
 601                 recvPdu->hdr->id, NULL, NULL, NULL);
 602         VERIFY_NON_NULL(sendPdu);
 603         result = SendCoAPPdu(gCoAPCtx, (coap_address_t*) &rcvdResponse->remote, sendPdu,
 604                      (coap_send_flags_t)(rcvdResponse->secure ? SEND_SECURE_PORT : 0));
 605         VERIFY_SUCCESS(result, OC_STACK_OK);
 606     }
 607     #ifdef WITH_PRESENCE
 608     else if(!cbNode && isPresenceNotification)
 609     {
 610         OC_LOG(INFO, TAG, PCF("Received a presence notification, but I do not have callback \
 611                      ------------ ignoring"));
 612     }
 613     #endif
 614     else
 615     {
 616         OC_LOG(INFO, TAG, PCF("Received a response, but I do not have callback. \
 617                  ------------ sending RESET"));
 618         sendPdu = GenerateCoAPPdu(COAP_MESSAGE_RST, 0,
 619                 recvPdu->hdr->id, NULL, NULL, NULL);
 620         VERIFY_NON_NULL(sendPdu);
 621         result = SendCoAPPdu(gCoAPCtx, (coap_address_t*) &rcvdResponse->remote, sendPdu,
 622                     (coap_send_flags_t)(rcvdResponse->secure ? SEND_SECURE_PORT : 0));
 623         VERIFY_SUCCESS(result, OC_STACK_OK);
 624     }
 625     exit:
 626         OCFree(resourceTypeName);
 627         OCFree(response);
 628 }
 629
 630 //=============================================================================
 631 // Functions
 632 //=============================================================================
 633
 634 /**
 635  * Initialize the CoAP client or server with its IPv4 address and CoAP port
 636  *
 637  * @param ipAddr
 638  *     IP Address of host device
 639  * @param port
 640  *     Port of host device
 641  * @param mode
 642  *     Host device is client, server, or client-server
 643  *
 644  * @return
 645  *   0   - success
 646  *   TBD - TBD error
 647  */
 648 OCStackResult OCInitCoAP(const char *address, uint16_t port, OCMode mode) {
 649
 650     OCStackResult ret = OC_STACK_ERROR;
 651
 652     TODO ("Below should go away and be replaced by OC_LOG");
 653     coap_log_t log_level = (coap_log_t)(LOG_DEBUG + 1);
 654     OCDevAddr mcastAddr;
 655     uint8_t ipAddr[4] = { 0 };
 656     uint16_t parsedPort = 0;
 657
 658     OC_LOG(INFO, TAG, PCF("Entering OCInitCoAP"));
 659
 660     coap_set_log_level(log_level);
 661
 662     if (address)
 663     {
 664         if (!ParseIPv4Address((unsigned char *) address, ipAddr, &parsedPort))
 665         {
 666             ret = OC_STACK_ERROR;
 667             goto exit;
 668         }
 669
 670         OC_LOG_V(INFO, TAG, "Parsed IP Address %d.%d.%d.%d",
 671                                ipAddr[0],ipAddr[1],ipAddr[2],ipAddr[3]);
 672     }
 673
 674     gCoAPCtx = coap_new_context(ipAddr, port);
 675     VERIFY_NON_NULL(gCoAPCtx);
 676
 677     // To allow presence notification work we need to init socket gCoAPCtx->sockfd_wellknown
 678     // for servers as well as clients
 679     OCBuildIPv4Address(COAP_WK_IPAddr_0, COAP_WK_IPAddr_1, COAP_WK_IPAddr_2,
 680             COAP_WK_IPAddr_3, COAP_DEFAULT_PORT, &mcastAddr);
 681     VERIFY_SUCCESS(
 682             coap_join_wellknown_group(gCoAPCtx,
 683                     (coap_address_t* )&mcastAddr), 0);
 684
 685     coap_register_request_handler(gCoAPCtx, HandleCoAPRequests);
 686     coap_register_response_handler(gCoAPCtx, HandleCoAPResponses);
 687     coap_register_ack_rst_handler(gCoAPCtx, HandleCoAPAckRst);
 688
 689     ret = OC_STACK_OK;
 690
 691 exit:
 692     if (ret != OC_STACK_OK)
 693     {
 694         OCStopCoAP();
 695     }
 696     return ret;
 697 }
 698
 699 /**
 700  * Discover OC resources
 701  *
 702  * @param method          - method to perform on the resource
 703  * @param qos             - Quality of Service the request will be sent on
 704  * @param token           - token which will added to the request
 705  * @param Uri             - URI of the resource to interact with
 706  * @param payload         - the request payload to be added to the request before sending
 707  *                          by the stack when discovery or resource interaction is complete
 708  * @param options         - The address of an array containing the vendor specific
 709  *                          header options to be sent with the request
 710  * @return
 711  *   0   - success
 712  *   TBD - TBD error
 713  */
 714 OCStackResult OCDoCoAPResource(OCMethod method, OCQualityOfService qos, OCCoAPToken * token,
 715                      const char *Uri, const char *payload, OCHeaderOption * options, uint8_t numOptions)
 716 {
 717
 718     OCStackResult ret = OC_STACK_ERROR;
 719     coap_pdu_t *pdu = NULL;
 720     coap_uri_t uri;
 721     OCDevAddr dst;
 722     uint8_t ipAddr[4] = { 0 };
 723     uint16_t port = 0;
 724     coap_list_t *optList = NULL;
 725     uint8_t coapMsgType;
 726     uint8_t coapMethod;
 727     uint32_t observeOption;
 728     coap_send_flags_t flag = (coap_send_flags_t)0;
 729
 730     OC_LOG(INFO, TAG, PCF("Entering OCDoCoAPResource"));
 731
 732     if (Uri) {
 733         OC_LOG_V(INFO, TAG, "URI = %s", Uri);
 734         VERIFY_SUCCESS(coap_split_uri((unsigned char * )Uri, strlen(Uri), &uri), OC_STACK_OK);
 735
 736         // Generate the destination address
 737         if (uri.host.length && ParseIPv4Address(uri.host.s, ipAddr, &port)) {
 738             OCBuildIPv4Address(ipAddr[0], ipAddr[1], ipAddr[2], ipAddr[3], uri.port,
 739                     &dst);
 740         } else {
 741             goto exit;
 742         }
 743
 744         VERIFY_SUCCESS(FormOptionList(&optList, NULL, NULL, NULL,
 745                 (uint16_t*)&uri.port, uri.path.length, uri.path.s, uri.query.length,
 746                 uri.query.s, options, numOptions), OC_STACK_OK);
 747
 748         //TODO : Investigate the scenario where there will be no uri for OCDoCoAPResource
 749         flag = (coap_send_flags_t) (uri.secure ? SEND_SECURE_PORT : 0);
 750         OC_LOG_V(DEBUG, TAG, "uri.host.s %s", uri.host.s);
 751         OC_LOG_V(DEBUG, TAG, "uri.path.s %s", uri.path.s);
 752         OC_LOG_V(DEBUG, TAG, "uri.port %d", uri.port);
 753         OC_LOG_V(DEBUG, TAG, "uri.query.s %s", uri.query.s);
 754         OC_LOG_V(DEBUG, TAG, "secure uri %d", uri.secure);
 755     }
 756
 757     coapMsgType = OCToCoAPQoS(qos, ipAddr);
 758
 759     // Decide method type
 760     switch (method) {
 761         case OC_REST_GET:
 762         #ifdef WITH_PRESENCE
 763         case OC_REST_PRESENCE:
 764         #endif
 765             coapMethod = COAP_REQUEST_GET;
 766             break;
 767         case OC_REST_PUT:
 768             coapMethod = COAP_REQUEST_PUT;
 769             break;
 770         case OC_REST_POST:
 771             coapMethod = COAP_REQUEST_POST;
 772             break;
 773         case OC_REST_DELETE:
 774             coapMethod = COAP_REQUEST_DELETE;
 775             break;
 776         case OC_REST_OBSERVE_ALL:
 777         case OC_REST_OBSERVE:
 778         case OC_REST_CANCEL_OBSERVE:
 779             coapMethod = COAP_REQUEST_GET;
 780             observeOption = (method == OC_REST_CANCEL_OBSERVE)?
 781                     OC_OBSERVE_DEREGISTER:OC_OBSERVE_REGISTER;
 782             coap_insert(&optList, CreateNewOptionNode(COAP_OPTION_OBSERVE,
 783                         sizeof(observeOption), (uint8_t *)&observeOption), OrderOptions);
 784             break;
 785         default:
 786             coapMethod = OC_REST_NOMETHOD;
 787             OC_LOG(FATAL, TAG, PCF("OCDoCoAPResource only supports GET, PUT, & OBSERVE methods"));
 788             break;
 789     }
 790
 791     VERIFY_NON_NULL(gCoAPCtx);
 792     pdu = GenerateCoAPPdu(coapMsgType, coapMethod,
 793             coap_new_message_id(gCoAPCtx), token,
 794             (unsigned char*) payload, optList);
 795     VERIFY_NON_NULL(pdu);
 796
 797     ret = SendCoAPPdu(gCoAPCtx, (coap_address_t*) &dst, pdu, flag);
 798
 799 exit:
 800     if (ret!= OC_STACK_OK)
 801     {
 802         OC_LOG(DEBUG, TAG, PCF("A problem occurred in sending a pdu"));
 803     }
 804     return ret;
 805 }
 806
 807 OCStackResult OCDoCoAPResponse(OCServerProtocolResponse *response)
 808 {
 809     OCStackResult result = OC_STACK_ERROR;
 810     coap_pdu_t * sendPdu = NULL;
 811     coap_list_t *optList = NULL;
 812     uint8_t msgType = COAP_MESSAGE_NON;
 813     uint8_t mediaType = COAP_MEDIATYPE_APPLICATION_JSON;
 814     uint32_t maxAge = 0x2ffff;
 815     coap_send_flags_t sendFlag = (coap_send_flags_t)0;
 816
 817     //uint32_t observeOption = OC_OBSERVE_NO_OPTION;
 818     //OCStackResult responseResult;
 819
 820     OC_LOG(INFO, TAG, PCF("Entering OCDoCoAPResponse"));
 821
 822     if(response->notificationFlag && response->qos == OC_HIGH_QOS)
 823     {
 824         msgType = COAP_MESSAGE_CON;
 825     }
 826     else if(response->notificationFlag && response->qos != OC_HIGH_QOS)
 827     {
 828         msgType = COAP_MESSAGE_NON;
 829     }
 830     else if(!response->notificationFlag && !response->slowFlag && response->qos == OC_HIGH_QOS)
 831     {
 832         msgType = COAP_MESSAGE_ACK;
 833     }
 834     else if(!response->notificationFlag && response->slowFlag && response->qos == OC_HIGH_QOS)
 835     {
 836         msgType = COAP_MESSAGE_CON;
 837     }
 838     else if(!response->notificationFlag)
 839     {
 840         msgType = COAP_MESSAGE_NON;
 841     }
 842
 843     if(response->coapID == 0)
 844     {
 845         response->coapID = coap_new_message_id(gCoAPCtx);
 846     }
 847
 848     if (response->observationOption != OC_OBSERVE_NO_OPTION)
 849     {
 850         result = FormOptionList(&optList, &mediaType, &maxAge,
 851                 &response->observationOption, NULL,
 852                 strlen((char *)response->resourceUri), response->resourceUri,
 853                 0, NULL,
 854                 response->sendVendorSpecificHeaderOptions,
 855                 response->numSendVendorSpecificHeaderOptions);
 856     }
 857     else
 858     {
 859         result = FormOptionList(&optList, &mediaType, &maxAge,
 860                 NULL, NULL,
 861                 strlen((char *)response->resourceUri), response->resourceUri,
 862                 0, NULL,
 863                 response->sendVendorSpecificHeaderOptions,
 864                 response->numSendVendorSpecificHeaderOptions);
 865     }
 866     VERIFY_SUCCESS(result, OC_STACK_OK);
 867
 868     sendPdu = GenerateCoAPPdu(msgType, OCToCoAPResponseCode(response->result),
 869             response->coapID, response->requestToken, (unsigned char *)response->payload,
 870             optList);
 871
 872     VERIFY_NON_NULL(sendPdu);
 873     coap_show_pdu(sendPdu);
 874
 875     sendFlag = (coap_send_flags_t)(response->delayedResNeeded ? SEND_DELAYED : 0);
 876     sendFlag = (coap_send_flags_t)( sendFlag | (response->secured ? SEND_SECURE_PORT : 0));
 877
 878     if (SendCoAPPdu(gCoAPCtx, (coap_address_t *) (response->requesterAddr), sendPdu, sendFlag)
 879             != OC_STACK_OK)
 880     {
 881         OC_LOG(ERROR, TAG, PCF("A problem occurred in sending a pdu"));
 882         return OC_STACK_ERROR;
 883     }
 884
 885     return OC_STACK_OK;
 886
 887 exit:
 888     OC_LOG(ERROR, TAG, PCF("Error formatting server response"));
 889     return OC_STACK_ERROR;
 890 }
 891
 892
 893 /**
 894  * Stop the CoAP client or server processing
 895  *
 896  * @return 0 - success, else - TBD error
 897  */
 898 OCStackResult OCStopCoAP() {
 899     OC_LOG(INFO, TAG, PCF("Entering OCStopCoAP"));
 900     coap_free_context(gCoAPCtx);
 901     gCoAPCtx = NULL;
 902     return OC_STACK_OK;
 903 }
 904
 905 /**
 906  * Called in main loop of CoAP client or server.  Allows low-level CoAP processing of
 907  * send, receive, timeout, discovery, callbacks, etc.
 908  *
 909  * @return 0 - success, else - TBD error
 910  */
 911 OCStackResult OCProcessCoAP() {
 912     int read = 0;
 913     read = coap_read(gCoAPCtx, gCoAPCtx->sockfd);
 914     if(read > 0) {
 915         OC_LOG(INFO, TAG, PCF("This is a Unicast<============"));
 916     }
 917     if (-1 != gCoAPCtx->sockfd_wellknown) {
 918         read = coap_read(gCoAPCtx, gCoAPCtx->sockfd_wellknown);
 919         if(read > 0)
 920         {
 921             OC_LOG(INFO, TAG, PCF("This is a Multicast<==========="));
 922         }
 923     }
 924     if (-1 != gCoAPCtx->sockfd_dtls) {
 925         read = coap_read(gCoAPCtx, gCoAPCtx->sockfd_dtls);
 926         if(read > 0)
 927         {
 928             OC_LOG(INFO, TAG, PCF("This is a Secure packet<==========="));
 929         }
 930     }
 931     coap_dispatch(gCoAPCtx);
 932
 933     HandleSendQueue(gCoAPCtx);
 934
 935     return OC_STACK_OK;
 936 }
 937
 938
 939 /**
 940  * Retrieve the info about the end-point where resource is being hosted.
 941  * Currently, this method only provides the IP port with which the socket
 942  * is bound.
 943  *
 944  * @return 0 - success, else - TBD error
 945  */
 946 OCStackResult OCGetResourceEndPointInfo (OCResource *resPtr, void *info) {
 947
 948     OCStackResult result = OC_STACK_ERROR;
 949     int sfd;
 950     OC_LOG(INFO, TAG, PCF("Entering OCGetResourceEndPointInfo"));
 951     VERIFY_NON_NULL(resPtr);
 952     VERIFY_NON_NULL(info);
 953
 954     sfd = (resPtr->resourceProperties & OC_SECURE) ? gCoAPCtx->sockfd_dtls :
 955             gCoAPCtx->sockfd;
 956
 957     if (OCGetSocketInfo(sfd, (uint16_t*)info) == ERR_SUCCESS)
 958         result = OC_STACK_OK;
 959 exit:
 960     return result;
 961 }
 962
 963