resource/csdk/stack/src/ocstack.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
  26 // Defining _POSIX_C_SOURCE macro with 200112L (or greater) as value
  27 // causes header files to expose definitions
  28 // corresponding to the POSIX.1-2001 base
  29 // specification (excluding the XSI extension).
  30 // For POSIX.1-2001 base specification,
  31 // Refer http://pubs.opengroup.org/onlinepubs/009695399/
  32 #define _POSIX_C_SOURCE 200112L
  33 #ifndef __STDC_FORMAT_MACROS
  34 #define __STDC_FORMAT_MACROS
  35 #endif
  36 #ifndef __STDC_LIMIT_MACROS
  37 #define __STDC_LIMIT_MACROS
  38 #endif
  39 #include <inttypes.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42
  43 #include "ocstack.h"
  44 #include "ocstackinternal.h"
  45 #include "ocresourcehandler.h"
  46 #include "occlientcb.h"
  47 #include "ocobserve.h"
  48 #include "ocrandom.h"
  49 #include "oic_malloc.h"
  50 #include "oic_string.h"
  51 #include "logger.h"
  52 #include "ocserverrequest.h"
  53 #include "secureresourcemanager.h"
  54 #include "doxmresource.h"
  55 #include "cacommon.h"
  56 #include "cainterface.h"
  57 #include "ocpayload.h"
  58 #include "ocpayloadcbor.h"
  59
  60 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
  61 #include "routingutility.h"
  62 #ifdef ROUTING_GATEWAY
  63 #include "routingmanager.h"
  64 #endif
  65 #endif
  66
  67 #ifdef TCP_ADAPTER
  68 #include "oickeepalive.h"
  69 #endif
  70
  71 //#ifdef DIRECT_PAIRING
  72 #include "directpairing.h"
  73 //#endif
  74
  75 #ifdef WITH_ARDUINO
  76 #include "Time.h"
  77 #else
  78 #include <sys/time.h>
  79 #endif
  80 #include "coap_time.h"
  81 #include "utlist.h"
  82 #include "pdu.h"
  83
  84 #ifndef ARDUINO
  85 #include <arpa/inet.h>
  86 #endif
  87
  88 #ifndef UINT32_MAX
  89 #define UINT32_MAX   (0xFFFFFFFFUL)
  90 #endif
  91
  92 //-----------------------------------------------------------------------------
  93 // Typedefs
  94 //-----------------------------------------------------------------------------
  95 typedef enum
  96 {
  97     OC_STACK_UNINITIALIZED = 0,
  98     OC_STACK_INITIALIZED,
  99     OC_STACK_UNINIT_IN_PROGRESS
 100 } OCStackState;
 101
 102 #ifdef WITH_PRESENCE
 103 typedef enum
 104 {
 105     OC_PRESENCE_UNINITIALIZED = 0,
 106     OC_PRESENCE_INITIALIZED
 107 } OCPresenceState;
 108 #endif
 109
 110 //-----------------------------------------------------------------------------
 111 // Private variables
 112 //-----------------------------------------------------------------------------
 113 static OCStackState stackState = OC_STACK_UNINITIALIZED;
 114
 115 OCResource *headResource = NULL;
 116 static OCResource *tailResource = NULL;
 117 static OCResourceHandle platformResource = {0};
 118 static OCResourceHandle deviceResource = {0};
 119 #ifdef WITH_PRESENCE
 120 static OCPresenceState presenceState = OC_PRESENCE_UNINITIALIZED;
 121 static PresenceResource presenceResource;
 122 static uint8_t PresenceTimeOutSize = 0;
 123 static uint32_t PresenceTimeOut[] = {50, 75, 85, 95, 100};
 124 #endif
 125
 126 static OCMode myStackMode;
 127 #ifdef RA_ADAPTER
 128 //TODO: revisit this design
 129 static bool gRASetInfo = false;
 130 #endif
 131 OCDeviceEntityHandler defaultDeviceHandler;
 132 void* defaultDeviceHandlerCallbackParameter = NULL;
 133 static const char COAP_TCP[] = "coap+tcp:";
 134
 135 //#ifdef DIRECT_PAIRING
 136 OCDirectPairingCB gDirectpairingCallback = NULL;
 137 //#endif
 138
 139 //-----------------------------------------------------------------------------
 140 // Macros
 141 //-----------------------------------------------------------------------------
 142 #define TAG  "OIC_RI_STACK"
 143 #define VERIFY_SUCCESS(op, successCode) { if ((op) != (successCode)) \
 144             {OIC_LOG_V(FATAL, TAG, "%s failed!!", #op); goto exit;} }
 145 #define VERIFY_NON_NULL(arg, logLevel, retVal) { if (!(arg)) { OIC_LOG((logLevel), \
 146              TAG, #arg " is NULL"); return (retVal); } }
 147 #define VERIFY_NON_NULL_NR(arg, logLevel) { if (!(arg)) { OIC_LOG((logLevel), \
 148              TAG, #arg " is NULL"); return; } }
 149 #define VERIFY_NON_NULL_V(arg) { if (!arg) {OIC_LOG(FATAL, TAG, #arg " is NULL");\
 150     goto exit;} }
 151
 152 //TODO: we should allow the server to define this
 153 #define MAX_OBSERVE_AGE (0x2FFFFUL)
 154
 155 #define MILLISECONDS_PER_SECOND   (1000)
 156
 157 //-----------------------------------------------------------------------------
 158 // Private internal function prototypes
 159 //-----------------------------------------------------------------------------
 160
 161 /**
 162  * Generate handle of OCDoResource invocation for callback management.
 163  *
 164  * @return Generated OCDoResource handle.
 165  */
 166 static OCDoHandle GenerateInvocationHandle();
 167
 168 /**
 169  * Initialize resource data structures, variables, etc.
 170  *
 171  * @return ::OC_STACK_OK on success, some other value upon failure.
 172  */
 173 static OCStackResult initResources();
 174
 175 /**
 176  * Add a resource to the end of the linked list of resources.
 177  *
 178  * @param resource Resource to be added
 179  */
 180 static void insertResource(OCResource *resource);
 181
 182 /**
 183  * Find a resource in the linked list of resources.
 184  *
 185  * @param resource Resource to be found.
 186  * @return Pointer to resource that was found in the linked list or NULL if the resource was not
 187  *         found.
 188  */
 189 static OCResource *findResource(OCResource *resource);
 190
 191 /**
 192  * Insert a resource type into a resource's resource type linked list.
 193  * If resource type already exists, it will not be inserted and the
 194  * resourceType will be free'd.
 195  * resourceType->next should be null to avoid memory leaks.
 196  * Function returns silently for null args.
 197  *
 198  * @param resource Resource where resource type is to be inserted.
 199  * @param resourceType Resource type to be inserted.
 200  */
 201 static void insertResourceType(OCResource *resource,
 202         OCResourceType *resourceType);
 203
 204 /**
 205  * Get a resource type at the specified index within a resource.
 206  *
 207  * @param handle Handle of resource.
 208  * @param index Index of resource type.
 209  *
 210  * @return Pointer to resource type if found, NULL otherwise.
 211  */
 212 static OCResourceType *findResourceTypeAtIndex(OCResourceHandle handle,
 213         uint8_t index);
 214
 215 /**
 216  * Insert a resource interface into a resource's resource interface linked list.
 217  * If resource interface already exists, it will not be inserted and the
 218  * resourceInterface will be free'd.
 219  * resourceInterface->next should be null to avoid memory leaks.
 220  *
 221  * @param resource Resource where resource interface is to be inserted.
 222  * @param resourceInterface Resource interface to be inserted.
 223  */
 224 static void insertResourceInterface(OCResource *resource,
 225         OCResourceInterface *resourceInterface);
 226
 227 /**
 228  * Get a resource interface at the specified index within a resource.
 229  *
 230  * @param handle Handle of resource.
 231  * @param index Index of resource interface.
 232  *
 233  * @return Pointer to resource interface if found, NULL otherwise.
 234  */
 235 static OCResourceInterface *findResourceInterfaceAtIndex(
 236         OCResourceHandle handle, uint8_t index);
 237
 238 /**
 239  * Delete all of the dynamically allocated elements that were created for the resource type.
 240  *
 241  * @param resourceType Specified resource type.
 242  */
 243 static void deleteResourceType(OCResourceType *resourceType);
 244
 245 /**
 246  * Delete all of the dynamically allocated elements that were created for the resource interface.
 247  *
 248  * @param resourceInterface Specified resource interface.
 249  */
 250 static void deleteResourceInterface(OCResourceInterface *resourceInterface);
 251
 252 /**
 253  * Delete all of the dynamically allocated elements that were created for the resource.
 254  *
 255  * @param resource Specified resource.
 256  */
 257 static void deleteResourceElements(OCResource *resource);
 258
 259 /**
 260  * Delete resource specified by handle.  Deletes resource and all resourcetype and resourceinterface
 261  * linked lists.
 262  *
 263  * @param handle Handle of resource to be deleted.
 264  *
 265  * @return ::OC_STACK_OK on success, some other value upon failure.
 266  */
 267 static OCStackResult deleteResource(OCResource *resource);
 268
 269 /**
 270  * Delete all of the resources in the resource list.
 271  */
 272 static void deleteAllResources();
 273
 274 /**
 275  * Increment resource sequence number.  Handles rollover.
 276  *
 277  * @param resPtr Pointer to resource.
 278  */
 279 static void incrementSequenceNumber(OCResource * resPtr);
 280
 281 /**
 282  * Verify the lengths of the URI and the query separately.
 283  *
 284  * @param inputUri Input URI and query.
 285  * @param uriLen The length of the initial URI with query.
 286  * @return ::OC_STACK_OK on success, some other value upon failure.
 287  */
 288 static OCStackResult verifyUriQueryLength(const char * inputUri,
 289         uint16_t uriLen);
 290
 291 /*
 292  * Attempts to initialize every network interface that the CA Layer might have compiled in.
 293  *
 294  * Note: At least one interface must succeed to initialize. If all calls to @ref CASelectNetwork
 295  * return something other than @ref CA_STATUS_OK, then this function fails.
 296  *
 297  * @return ::CA_STATUS_OK on success, some other value upon failure.
 298  */
 299 static CAResult_t OCSelectNetwork();
 300
 301 /**
 302  * Get the CoAP ticks after the specified number of milli-seconds.
 303  *
 304  * @param afterMilliSeconds Milli-seconds.
 305  * @return
 306  *     CoAP ticks
 307  */
 308 static uint32_t GetTicks(uint32_t afterMilliSeconds);
 309
 310 /**
 311  * Convert CAResponseResult_t to OCStackResult.
 312  *
 313  * @param caCode CAResponseResult_t code.
 314  * @return ::OC_STACK_OK on success, some other value upon failure.
 315  */
 316 static OCStackResult CAToOCStackResult(CAResponseResult_t caCode);
 317
 318 /**
 319  * Convert OCStackResult to CAResponseResult_t.
 320  *
 321  * @param caCode OCStackResult code.
 322  * @param method OCMethod method the return code replies to.
 323  * @return ::CA_CONTENT on OK, some other value upon failure.
 324  */
 325 static CAResponseResult_t OCToCAStackResult(OCStackResult ocCode, OCMethod method);
 326
 327 /**
 328  * Convert OCTransportFlags_t to CATransportModifiers_t.
 329  *
 330  * @param ocConType OCTransportFlags_t input.
 331  * @return CATransportFlags
 332  */
 333 static CATransportFlags_t OCToCATransportFlags(OCTransportFlags ocConType);
 334
 335 /**
 336  * Convert CATransportFlags_t to OCTransportModifiers_t.
 337  *
 338  * @param caConType CATransportFlags_t input.
 339  * @return OCTransportFlags
 340  */
 341 static OCTransportFlags CAToOCTransportFlags(CATransportFlags_t caConType);
 342
 343 /**
 344  * Handle response from presence request.
 345  *
 346  * @param endPoint CA remote endpoint.
 347  * @param responseInfo CA response info.
 348  * @return ::OC_STACK_OK on success, some other value upon failure.
 349  */
 350 static OCStackResult HandlePresenceResponse(const CAEndpoint_t *endPoint,
 351         const CAResponseInfo_t *responseInfo);
 352
 353 /**
 354  * This function will be called back by CA layer when a response is received.
 355  *
 356  * @param endPoint CA remote endpoint.
 357  * @param responseInfo CA response info.
 358  */
 359 static void HandleCAResponses(const CAEndpoint_t* endPoint,
 360         const CAResponseInfo_t* responseInfo);
 361
 362 /**
 363  * This function will be called back by CA layer when a request is received.
 364  *
 365  * @param endPoint CA remote endpoint.
 366  * @param requestInfo CA request info.
 367  */
 368 static void HandleCARequests(const CAEndpoint_t* endPoint,
 369         const CARequestInfo_t* requestInfo);
 370
 371 /**
 372  * Extract query from a URI.
 373  *
 374  * @param uri Full URI with query.
 375  * @param query Pointer to string that will contain query.
 376  * @param newURI Pointer to string that will contain URI.
 377  * @return ::OC_STACK_OK on success, some other value upon failure.
 378  */
 379 static OCStackResult getQueryFromUri(const char * uri, char** resourceType, char ** newURI);
 380
 381 /**
 382  * Finds a resource type in an OCResourceType link-list.
 383  *
 384  * @param resourceTypeList The link-list to be searched through.
 385  * @param resourceTypeName The key to search for.
 386  *
 387  * @return Resource type that matches the key (ie. resourceTypeName) or
 388  *      NULL if there is either an invalid parameter or this function was unable to find the key.
 389  */
 390 static OCResourceType *findResourceType(OCResourceType * resourceTypeList,
 391         const char * resourceTypeName);
 392
 393 /**
 394  * Reset presence TTL for a ClientCB struct. ttlLevel will be set to 0.
 395  * TTL will be set to maxAge.
 396  *
 397  * @param cbNode Callback Node for which presence ttl is to be reset.
 398  * @param maxAge New value of ttl in seconds.
 399
 400  * @return ::OC_STACK_OK on success, some other value upon failure.
 401  */
 402 static OCStackResult ResetPresenceTTL(ClientCB *cbNode, uint32_t maxAgeSeconds);
 403
 404 /**
 405  * Ensure the accept header option is set appropriatly before sending the requests and routing
 406  * header option is updated with destination.
 407  *
 408  * @param object CA remote endpoint.
 409  * @param requestInfo CA request info.
 410  *
 411  * @return ::OC_STACK_OK on success, some other value upon failure.
 412  */
 413 static OCStackResult OCSendRequest(const CAEndpoint_t *object, CARequestInfo_t *requestInfo);
 414
 415 //-----------------------------------------------------------------------------
 416 // Internal functions
 417 //-----------------------------------------------------------------------------
 418
 419 uint32_t GetTicks(uint32_t afterMilliSeconds)
 420 {
 421     coap_tick_t now;
 422     coap_ticks(&now);
 423
 424     // Guard against overflow of uint32_t
 425     if (afterMilliSeconds <= ((UINT32_MAX - (uint32_t)now) * MILLISECONDS_PER_SECOND) /
 426                              COAP_TICKS_PER_SECOND)
 427     {
 428         return now + (afterMilliSeconds * COAP_TICKS_PER_SECOND)/MILLISECONDS_PER_SECOND;
 429     }
 430     else
 431     {
 432         return UINT32_MAX;
 433     }
 434 }
 435
 436 void CopyEndpointToDevAddr(const CAEndpoint_t *in, OCDevAddr *out)
 437 {
 438     VERIFY_NON_NULL_NR(in, FATAL);
 439     VERIFY_NON_NULL_NR(out, FATAL);
 440
 441     out->adapter = (OCTransportAdapter)in->adapter;
 442     out->flags = CAToOCTransportFlags(in->flags);
 443     OICStrcpy(out->addr, sizeof(out->addr), in->addr);
 444     out->port = in->port;
 445     out->ifindex = in->ifindex;
 446 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
 447     memcpy(out->routeData, in->routeData, sizeof(out->routeData));
 448 #endif
 449 }
 450
 451 void CopyDevAddrToEndpoint(const OCDevAddr *in, CAEndpoint_t *out)
 452 {
 453     VERIFY_NON_NULL_NR(in, FATAL);
 454     VERIFY_NON_NULL_NR(out, FATAL);
 455
 456     out->adapter = (CATransportAdapter_t)in->adapter;
 457     out->flags = OCToCATransportFlags(in->flags);
 458     OICStrcpy(out->addr, sizeof(out->addr), in->addr);
 459 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
 460     memcpy(out->routeData, in->routeData, sizeof(out->routeData));
 461 #endif
 462     out->port = in->port;
 463     out->ifindex = in->ifindex;
 464 }
 465
 466 void FixUpClientResponse(OCClientResponse *cr)
 467 {
 468     VERIFY_NON_NULL_NR(cr, FATAL);
 469
 470     cr->addr = &cr->devAddr;
 471     cr->connType = (OCConnectivityType)
 472         ((cr->devAddr.adapter << CT_ADAPTER_SHIFT) | (cr->devAddr.flags & CT_MASK_FLAGS));
 473 }
 474
 475 static OCStackResult OCSendRequest(const CAEndpoint_t *object, CARequestInfo_t *requestInfo)
 476 {
 477     VERIFY_NON_NULL(object, FATAL, OC_STACK_INVALID_PARAM);
 478     VERIFY_NON_NULL(requestInfo, FATAL, OC_STACK_INVALID_PARAM);
 479
 480 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
 481     OCStackResult rmResult = RMAddInfo(object->routeData, requestInfo, true, NULL);
 482     if (OC_STACK_OK != rmResult)
 483     {
 484         OIC_LOG(ERROR, TAG, "Add destination option failed");
 485         return rmResult;
 486     }
 487 #endif
 488
 489     // OC stack prefer CBOR encoded payloads.
 490     requestInfo->info.acceptFormat = CA_FORMAT_APPLICATION_CBOR;
 491     CAResult_t result = CASendRequest(object, requestInfo);
 492     if(CA_STATUS_OK != result)
 493     {
 494         OIC_LOG_V(ERROR, TAG, "CASendRequest failed with CA error %u", result);
 495         return CAResultToOCResult(result);
 496     }
 497     return OC_STACK_OK;
 498 }
 499 //-----------------------------------------------------------------------------
 500 // Internal API function
 501 //-----------------------------------------------------------------------------
 502
 503 // This internal function is called to update the stack with the status of
 504 // observers and communication failures
 505 OCStackResult OCStackFeedBack(CAToken_t token, uint8_t tokenLength, uint8_t status)
 506 {
 507     OCStackResult result = OC_STACK_ERROR;
 508     ResourceObserver * observer = NULL;
 509     OCEntityHandlerRequest ehRequest = {0};
 510
 511     switch(status)
 512     {
 513     case OC_OBSERVER_NOT_INTERESTED:
 514         OIC_LOG(DEBUG, TAG, "observer not interested in our notifications");
 515         observer = GetObserverUsingToken (token, tokenLength);
 516         if(observer)
 517         {
 518             result = FormOCEntityHandlerRequest(&ehRequest,
 519                                                 (OCRequestHandle)NULL,
 520                                                 OC_REST_NOMETHOD,
 521                                                 &observer->devAddr,
 522                                                 (OCResourceHandle)NULL,
 523                                                 NULL, PAYLOAD_TYPE_REPRESENTATION,
 524                                                 NULL, 0, 0, NULL,
 525                                                 OC_OBSERVE_DEREGISTER,
 526                                                 observer->observeId);
 527             if(result != OC_STACK_OK)
 528             {
 529                 return result;
 530             }
 531             observer->resource->entityHandler(OC_OBSERVE_FLAG, &ehRequest,
 532                             observer->resource->entityHandlerCallbackParam);
 533         }
 534
 535         result = DeleteObserverUsingToken (token, tokenLength);
 536         if(result == OC_STACK_OK)
 537         {
 538             OIC_LOG(DEBUG, TAG, "Removed observer successfully");
 539         }
 540         else
 541         {
 542             result = OC_STACK_OK;
 543             OIC_LOG(DEBUG, TAG, "Observer Removal failed");
 544         }
 545         break;
 546
 547     case OC_OBSERVER_STILL_INTERESTED:
 548         OIC_LOG(DEBUG, TAG, "observer still interested, reset the failedCount");
 549         observer = GetObserverUsingToken (token, tokenLength);
 550         if(observer)
 551         {
 552             observer->forceHighQos = 0;
 553             observer->failedCommCount = 0;
 554             result = OC_STACK_OK;
 555         }
 556         else
 557         {
 558             result = OC_STACK_OBSERVER_NOT_FOUND;
 559         }
 560         break;
 561
 562     case OC_OBSERVER_FAILED_COMM:
 563         OIC_LOG(DEBUG, TAG, "observer is unreachable");
 564         observer = GetObserverUsingToken (token, tokenLength);
 565         if(observer)
 566         {
 567             if(observer->failedCommCount >= MAX_OBSERVER_FAILED_COMM)
 568             {
 569                 result = FormOCEntityHandlerRequest(&ehRequest,
 570                                                     (OCRequestHandle)NULL,
 571                                                     OC_REST_NOMETHOD,
 572                                                     &observer->devAddr,
 573                                                     (OCResourceHandle)NULL,
 574                                                     NULL, PAYLOAD_TYPE_REPRESENTATION,
 575                                                     NULL, 0, 0, NULL,
 576                                                     OC_OBSERVE_DEREGISTER,
 577                                                     observer->observeId);
 578                 if(result != OC_STACK_OK)
 579                 {
 580                     return OC_STACK_ERROR;
 581                 }
 582                 observer->resource->entityHandler(OC_OBSERVE_FLAG, &ehRequest,
 583                                     observer->resource->entityHandlerCallbackParam);
 584
 585                 result = DeleteObserverUsingToken (token, tokenLength);
 586                 if(result == OC_STACK_OK)
 587                 {
 588                     OIC_LOG(DEBUG, TAG, "Removed observer successfully");
 589                 }
 590                 else
 591                 {
 592                     result = OC_STACK_OK;
 593                     OIC_LOG(DEBUG, TAG, "Observer Removal failed");
 594                 }
 595             }
 596             else
 597             {
 598                 observer->failedCommCount++;
 599                 result = OC_STACK_CONTINUE;
 600             }
 601             observer->forceHighQos = 1;
 602             OIC_LOG_V(DEBUG, TAG, "Failed count for this observer is %d",observer->failedCommCount);
 603         }
 604         break;
 605     default:
 606         OIC_LOG(ERROR, TAG, "Unknown status");
 607         result = OC_STACK_ERROR;
 608         break;
 609         }
 610     return result;
 611 }
 612 OCStackResult CAToOCStackResult(CAResponseResult_t caCode)
 613 {
 614     OCStackResult ret = OC_STACK_ERROR;
 615
 616     switch(caCode)
 617     {
 618         case CA_CREATED:
 619             ret = OC_STACK_RESOURCE_CREATED;
 620             break;
 621         case CA_DELETED:
 622             ret = OC_STACK_RESOURCE_DELETED;
 623             break;
 624         case CA_CHANGED:
 625         case CA_CONTENT:
 626         case CA_VALID:
 627             ret = OC_STACK_OK;
 628             break;
 629         case CA_BAD_REQ:
 630             ret = OC_STACK_INVALID_QUERY;
 631             break;
 632         case CA_UNAUTHORIZED_REQ:
 633             ret = OC_STACK_UNAUTHORIZED_REQ;
 634             break;
 635         case CA_BAD_OPT:
 636             ret = OC_STACK_INVALID_OPTION;
 637             break;
 638         case CA_NOT_FOUND:
 639             ret = OC_STACK_NO_RESOURCE;
 640             break;
 641         case CA_RETRANSMIT_TIMEOUT:
 642             ret = OC_STACK_COMM_ERROR;
 643             break;
 644         default:
 645             break;
 646     }
 647     return ret;
 648 }
 649
 650 CAResponseResult_t OCToCAStackResult(OCStackResult ocCode, OCMethod method)
 651 {
 652     CAResponseResult_t ret = CA_INTERNAL_SERVER_ERROR;
 653
 654     switch(ocCode)
 655     {
 656         case OC_STACK_OK:
 657            switch (method)
 658            {
 659                case OC_REST_PUT:
 660                case OC_REST_POST:
 661                    // This Response Code is like HTTP 204 "No Content" but only used in
 662                    // response to POST and PUT requests.
 663                    ret = CA_CHANGED;
 664                    break;
 665                case OC_REST_GET:
 666                    // This Response Code is like HTTP 200 "OK" but only used in response to
 667                    // GET requests.
 668                    ret = CA_CONTENT;
 669                    break;
 670                default:
 671                    // This should not happen but,
 672                    // give it a value just in case but output an error
 673                    ret = CA_CONTENT;
 674                    OIC_LOG_V(ERROR, TAG, "Unexpected OC_STACK_OK return code for method [%d].", method);
 675             }
 676             break;
 677         case OC_STACK_RESOURCE_CREATED:
 678             ret = CA_CREATED;
 679             break;
 680         case OC_STACK_RESOURCE_DELETED:
 681             ret = CA_DELETED;
 682             break;
 683         case OC_STACK_INVALID_QUERY:
 684             ret = CA_BAD_REQ;
 685             break;
 686         case OC_STACK_INVALID_OPTION:
 687             ret = CA_BAD_OPT;
 688             break;
 689         case OC_STACK_NO_RESOURCE:
 690             ret = CA_NOT_FOUND;
 691             break;
 692         case OC_STACK_COMM_ERROR:
 693             ret = CA_RETRANSMIT_TIMEOUT;
 694             break;
 695         case OC_STACK_UNAUTHORIZED_REQ:
 696             ret = CA_UNAUTHORIZED_REQ;
 697             break;
 698         default:
 699             break;
 700     }
 701     return ret;
 702 }
 703
 704 CATransportFlags_t OCToCATransportFlags(OCTransportFlags ocFlags)
 705 {
 706     CATransportFlags_t caFlags = (CATransportFlags_t)ocFlags;
 707
 708     // supply default behavior.
 709     if ((caFlags & (CA_IPV6|CA_IPV4)) == 0)
 710     {
 711         caFlags = (CATransportFlags_t)(caFlags|CA_IPV6|CA_IPV4);
 712     }
 713     if ((caFlags & OC_MASK_SCOPE) == 0)
 714     {
 715         caFlags = (CATransportFlags_t)(caFlags|OC_SCOPE_LINK);
 716     }
 717     return caFlags;
 718 }
 719
 720 OCTransportFlags CAToOCTransportFlags(CATransportFlags_t caFlags)
 721 {
 722     return (OCTransportFlags)caFlags;
 723 }
 724
 725 static OCStackResult ResetPresenceTTL(ClientCB *cbNode, uint32_t maxAgeSeconds)
 726 {
 727     uint32_t lowerBound  = 0;
 728     uint32_t higherBound = 0;
 729
 730     if (!cbNode || !cbNode->presence || !cbNode->presence->timeOut)
 731     {
 732         return OC_STACK_INVALID_PARAM;
 733     }
 734
 735     OIC_LOG_V(INFO, TAG, "Update presence TTL, time is %u", GetTicks(0));
 736
 737     cbNode->presence->TTL = maxAgeSeconds;
 738
 739     for (int index = 0; index < PresenceTimeOutSize; index++)
 740     {
 741         // Guard against overflow
 742         if (cbNode->presence->TTL < (UINT32_MAX/(MILLISECONDS_PER_SECOND*PresenceTimeOut[index]))
 743                                      * 100)
 744         {
 745             lowerBound = GetTicks((PresenceTimeOut[index] *
 746                                   cbNode->presence->TTL *
 747                                   MILLISECONDS_PER_SECOND)/100);
 748         }
 749         else
 750         {
 751             lowerBound = GetTicks(UINT32_MAX);
 752         }
 753
 754         if (cbNode->presence->TTL < (UINT32_MAX/(MILLISECONDS_PER_SECOND*PresenceTimeOut[index+1]))
 755                                      * 100)
 756         {
 757             higherBound = GetTicks((PresenceTimeOut[index + 1] *
 758                                    cbNode->presence->TTL *
 759                                    MILLISECONDS_PER_SECOND)/100);
 760         }
 761         else
 762         {
 763             higherBound = GetTicks(UINT32_MAX);
 764         }
 765
 766         cbNode->presence->timeOut[index] = OCGetRandomRange(lowerBound, higherBound);
 767
 768         OIC_LOG_V(DEBUG, TAG, "lowerBound timeout  %d", lowerBound);
 769         OIC_LOG_V(DEBUG, TAG, "higherBound timeout %d", higherBound);
 770         OIC_LOG_V(DEBUG, TAG, "timeOut entry  %d", cbNode->presence->timeOut[index]);
 771     }
 772
 773     cbNode->presence->TTLlevel = 0;
 774
 775     OIC_LOG_V(DEBUG, TAG, "this TTL level %d", cbNode->presence->TTLlevel);
 776     return OC_STACK_OK;
 777 }
 778
 779 const char *convertTriggerEnumToString(OCPresenceTrigger trigger)
 780 {
 781     if (trigger == OC_PRESENCE_TRIGGER_CREATE)
 782     {
 783         return OC_RSRVD_TRIGGER_CREATE;
 784     }
 785     else if (trigger == OC_PRESENCE_TRIGGER_CHANGE)
 786     {
 787         return OC_RSRVD_TRIGGER_CHANGE;
 788     }
 789     else
 790     {
 791         return OC_RSRVD_TRIGGER_DELETE;
 792     }
 793 }
 794
 795 OCPresenceTrigger convertTriggerStringToEnum(const char * triggerStr)
 796 {
 797     if(!triggerStr)
 798     {
 799         return OC_PRESENCE_TRIGGER_CREATE;
 800     }
 801     else if(strcmp(triggerStr, OC_RSRVD_TRIGGER_CREATE) == 0)
 802     {
 803         return OC_PRESENCE_TRIGGER_CREATE;
 804     }
 805     else if(strcmp(triggerStr, OC_RSRVD_TRIGGER_CHANGE) == 0)
 806     {
 807         return OC_PRESENCE_TRIGGER_CHANGE;
 808     }
 809     else
 810     {
 811         return OC_PRESENCE_TRIGGER_DELETE;
 812     }
 813 }
 814
 815 /**
 816  * The cononical presence allows constructed URIs to be string compared.
 817  *
 818  * requestUri must be a char array of size CA_MAX_URI_LENGTH
 819  */
 820 static int FormCanonicalPresenceUri(const CAEndpoint_t *endpoint, char *resourceUri,
 821         char *presenceUri)
 822 {
 823     VERIFY_NON_NULL(endpoint   , FATAL, OC_STACK_INVALID_PARAM);
 824     VERIFY_NON_NULL(resourceUri, FATAL, OC_STACK_INVALID_PARAM);
 825     VERIFY_NON_NULL(presenceUri, FATAL, OC_STACK_INVALID_PARAM);
 826
 827     CAEndpoint_t *ep = (CAEndpoint_t *)endpoint;
 828
 829     if (ep->adapter == CA_ADAPTER_IP)
 830     {
 831         if ((ep->flags & CA_IPV6) && !(ep->flags & CA_IPV4))
 832         {
 833             if ('\0' == ep->addr[0])  // multicast
 834             {
 835                 return snprintf(presenceUri, CA_MAX_URI_LENGTH, OC_RSRVD_PRESENCE_URI);
 836             }
 837             else
 838             {
 839                 return snprintf(presenceUri, CA_MAX_URI_LENGTH, "coap://[%s]:%u%s",
 840                         ep->addr, ep->port, OC_RSRVD_PRESENCE_URI);
 841             }
 842         }
 843         else
 844         {
 845             if ('\0' == ep->addr[0])  // multicast
 846             {
 847                 OICStrcpy(ep->addr, sizeof(ep->addr), OC_MULTICAST_IP);
 848                 ep->port = OC_MULTICAST_PORT;
 849             }
 850             return snprintf(presenceUri, CA_MAX_URI_LENGTH, "coap://%s:%u%s",
 851                     ep->addr, ep->port, OC_RSRVD_PRESENCE_URI);
 852         }
 853     }
 854
 855     // might work for other adapters (untested, but better than nothing)
 856     return snprintf(presenceUri, CA_MAX_URI_LENGTH, "coap://%s%s", ep->addr,
 857                     OC_RSRVD_PRESENCE_URI);
 858 }
 859
 860
 861 OCStackResult HandlePresenceResponse(const CAEndpoint_t *endpoint,
 862                             const CAResponseInfo_t *responseInfo)
 863 {
 864     VERIFY_NON_NULL(endpoint, FATAL, OC_STACK_INVALID_PARAM);
 865     VERIFY_NON_NULL(responseInfo, FATAL, OC_STACK_INVALID_PARAM);
 866
 867     OCStackApplicationResult cbResult = OC_STACK_DELETE_TRANSACTION;
 868     ClientCB * cbNode = NULL;
 869     char *resourceTypeName = NULL;
 870     OCClientResponse response = {.devAddr = {.adapter = OC_DEFAULT_ADAPTER}};
 871     OCStackResult result = OC_STACK_ERROR;
 872     uint32_t maxAge = 0;
 873     int uriLen;
 874     char presenceUri[CA_MAX_URI_LENGTH];
 875
 876     int presenceSubscribe = 0;
 877     int multicastPresenceSubscribe = 0;
 878
 879     if (responseInfo->result != CA_CONTENT)
 880     {
 881         OIC_LOG_V(ERROR, TAG, "HandlePresenceResponse failed %d", responseInfo->result);
 882         return OC_STACK_ERROR;
 883     }
 884
 885     // check for unicast presence
 886     uriLen = FormCanonicalPresenceUri(endpoint, OC_RSRVD_PRESENCE_URI, presenceUri);
 887     if (uriLen < 0 || (size_t)uriLen >= sizeof (presenceUri))
 888     {
 889         return OC_STACK_INVALID_URI;
 890     }
 891
 892     cbNode = GetClientCB(NULL, 0, NULL, presenceUri);
 893     if (cbNode)
 894     {
 895         presenceSubscribe = 1;
 896     }
 897     else
 898     {
 899         // check for multiicast presence
 900         CAEndpoint_t ep = { .adapter = endpoint->adapter,
 901                             .flags = endpoint->flags };
 902
 903         uriLen = FormCanonicalPresenceUri(&ep, OC_RSRVD_PRESENCE_URI, presenceUri);
 904
 905         cbNode = GetClientCB(NULL, 0, NULL, presenceUri);
 906         if (cbNode)
 907         {
 908             multicastPresenceSubscribe = 1;
 909         }
 910     }
 911
 912     if (!presenceSubscribe && !multicastPresenceSubscribe)
 913     {
 914         OIC_LOG(ERROR, TAG, "Received a presence notification, but no callback, ignoring");
 915         goto exit;
 916     }
 917
 918     response.payload = NULL;
 919     response.result = OC_STACK_OK;
 920
 921     CopyEndpointToDevAddr(endpoint, &response.devAddr);
 922     FixUpClientResponse(&response);
 923
 924     if (responseInfo->info.payload)
 925     {
 926         result = OCParsePayload(&response.payload,
 927                 PAYLOAD_TYPE_PRESENCE,
 928                 responseInfo->info.payload,
 929                 responseInfo->info.payloadSize);
 930
 931         if(result != OC_STACK_OK)
 932         {
 933             OIC_LOG(ERROR, TAG, "Presence parse failed");
 934             goto exit;
 935         }
 936         if(!response.payload || response.payload->type != PAYLOAD_TYPE_PRESENCE)
 937         {
 938             OIC_LOG(ERROR, TAG, "Presence payload was wrong type");
 939             result = OC_STACK_ERROR;
 940             goto exit;
 941         }
 942         response.sequenceNumber = ((OCPresencePayload*)response.payload)->sequenceNumber;
 943         resourceTypeName = ((OCPresencePayload*)response.payload)->resourceType;
 944         maxAge = ((OCPresencePayload*)response.payload)->maxAge;
 945     }
 946
 947     if (presenceSubscribe)
 948     {
 949         if(cbNode->sequenceNumber == response.sequenceNumber)
 950         {
 951             OIC_LOG(INFO, TAG, "No presence change");
 952             ResetPresenceTTL(cbNode, maxAge);
 953             OIC_LOG_V(INFO, TAG, "ResetPresenceTTL - TTLlevel:%d\n", cbNode->presence->TTLlevel);
 954             goto exit;
 955         }
 956
 957         if(maxAge == 0)
 958         {
 959             OIC_LOG(INFO, TAG, "Stopping presence");
 960             response.result = OC_STACK_PRESENCE_STOPPED;
 961             if(cbNode->presence)
 962             {
 963                 OICFree(cbNode->presence->timeOut);
 964                 OICFree(cbNode->presence);
 965                 cbNode->presence = NULL;
 966             }
 967         }
 968         else
 969         {
 970             if(!cbNode->presence)
 971             {
 972                 cbNode->presence = (OCPresence *)OICMalloc(sizeof (OCPresence));
 973
 974                 if(!(cbNode->presence))
 975                 {
 976                     OIC_LOG(ERROR, TAG, "Could not allocate memory for cbNode->presence");
 977                     result = OC_STACK_NO_MEMORY;
 978                     goto exit;
 979                 }
 980
 981                 VERIFY_NON_NULL_V(cbNode->presence);
 982                 cbNode->presence->timeOut = NULL;
 983                 cbNode->presence->timeOut = (uint32_t *)
 984                         OICMalloc(PresenceTimeOutSize * sizeof(uint32_t));
 985                 if(!(cbNode->presence->timeOut)){
 986                     OIC_LOG(ERROR, TAG,
 987                                   "Could not allocate memory for cbNode->presence->timeOut");
 988                     OICFree(cbNode->presence);
 989                     result = OC_STACK_NO_MEMORY;
 990                     goto exit;
 991                 }
 992             }
 993
 994             ResetPresenceTTL(cbNode, maxAge);
 995
 996             cbNode->sequenceNumber = response.sequenceNumber;
 997
 998             // Ensure that a filter is actually applied.
 999             if( resourceTypeName && cbNode->filterResourceType)
1000             {
1001                 if(!findResourceType(cbNode->filterResourceType, resourceTypeName))
1002                 {
1003                     goto exit;
1004                 }
1005             }
1006         }
1007     }
1008     else
1009     {
1010         // This is the multicast case
1011         OCMulticastNode* mcNode = NULL;
1012         mcNode = GetMCPresenceNode(presenceUri);
1013
1014         if(mcNode != NULL)
1015         {
1016             if(mcNode->nonce == response.sequenceNumber)
1017             {
1018                 OIC_LOG(INFO, TAG, "No presence change (Multicast)");
1019                 goto exit;
1020             }
1021             mcNode->nonce = response.sequenceNumber;
1022
1023             if(maxAge == 0)
1024             {
1025                 OIC_LOG(INFO, TAG, "Stopping presence");
1026                 response.result = OC_STACK_PRESENCE_STOPPED;
1027             }
1028         }
1029         else
1030         {
1031             char* uri = OICStrdup(presenceUri);
1032             if (!uri)
1033             {
1034                 OIC_LOG(INFO, TAG,
1035                     "No Memory for URI to store in the presence node");
1036                 result = OC_STACK_NO_MEMORY;
1037                 goto exit;
1038             }
1039
1040             result = AddMCPresenceNode(&mcNode, uri, response.sequenceNumber);
1041             if(result == OC_STACK_NO_MEMORY)
1042             {
1043                 OIC_LOG(INFO, TAG,
1044                     "No Memory for Multicast Presence Node");
1045                 OICFree(uri);
1046                 goto exit;
1047             }
1048             // presence node now owns uri
1049         }
1050
1051         // Ensure that a filter is actually applied.
1052         if(resourceTypeName && cbNode->filterResourceType)
1053         {
1054             if(!findResourceType(cbNode->filterResourceType, resourceTypeName))
1055             {
1056                 goto exit;
1057             }
1058         }
1059     }
1060
1061     cbResult = cbNode->callBack(cbNode->context, cbNode->handle, &response);
1062
1063     if (cbResult == OC_STACK_DELETE_TRANSACTION)
1064     {
1065         FindAndDeleteClientCB(cbNode);
1066     }
1067
1068 exit:
1069     OCPayloadDestroy(response.payload);
1070     return result;
1071 }
1072
1073 void OCHandleResponse(const CAEndpoint_t* endPoint, const CAResponseInfo_t* responseInfo)
1074 {
1075     OIC_LOG(DEBUG, TAG, "Enter OCHandleResponse");
1076
1077     if(responseInfo->info.resourceUri &&
1078         strcmp(responseInfo->info.resourceUri, OC_RSRVD_PRESENCE_URI) == 0)
1079     {
1080         HandlePresenceResponse(endPoint, responseInfo);
1081         return;
1082     }
1083
1084     ClientCB *cbNode = GetClientCB(responseInfo->info.token,
1085             responseInfo->info.tokenLength, NULL, NULL);
1086
1087     ResourceObserver * observer = GetObserverUsingToken (responseInfo->info.token,
1088             responseInfo->info.tokenLength);
1089
1090     if(cbNode)
1091     {
1092         OIC_LOG(INFO, TAG, "There is a cbNode associated with the response token");
1093         if(responseInfo->result == CA_EMPTY)
1094         {
1095             OIC_LOG(INFO, TAG, "Receiving A ACK/RESET for this token");
1096             // We do not have a case for the client to receive a RESET
1097             if(responseInfo->info.type == CA_MSG_ACKNOWLEDGE)
1098             {
1099                 //This is the case of receiving an ACK on a request to a slow resource!
1100                 OIC_LOG(INFO, TAG, "This is a pure ACK");
1101                 //TODO: should we inform the client
1102                 //      app that at least the request was received at the server?
1103             }
1104         }
1105         else if(responseInfo->result == CA_RETRANSMIT_TIMEOUT)
1106         {
1107             OIC_LOG(INFO, TAG, "Receiving A Timeout for this token");
1108             OIC_LOG(INFO, TAG, "Calling into application address space");
1109
1110             OCClientResponse response =
1111                 {.devAddr = {.adapter = OC_DEFAULT_ADAPTER}};
1112             CopyEndpointToDevAddr(endPoint, &response.devAddr);
1113             FixUpClientResponse(&response);
1114             response.resourceUri = responseInfo->info.resourceUri;
1115             memcpy(response.identity.id, responseInfo->info.identity.id,
1116                                                 sizeof (response.identity.id));
1117             response.identity.id_length = responseInfo->info.identity.id_length;
1118
1119             response.result = CAToOCStackResult(responseInfo->result);
1120             cbNode->callBack(cbNode->context,
1121                     cbNode->handle, &response);
1122             FindAndDeleteClientCB(cbNode);
1123         }
1124         else
1125         {
1126             OIC_LOG(INFO, TAG, "This is a regular response, A client call back is found");
1127             OIC_LOG(INFO, TAG, "Calling into application address space");
1128
1129             OCClientResponse response =
1130                 {.devAddr = {.adapter = OC_DEFAULT_ADAPTER}};
1131             response.sequenceNumber = OC_OBSERVE_NO_OPTION;
1132             CopyEndpointToDevAddr(endPoint, &response.devAddr);
1133             FixUpClientResponse(&response);
1134             response.resourceUri = responseInfo->info.resourceUri;
1135             memcpy(response.identity.id, responseInfo->info.identity.id,
1136                                                 sizeof (response.identity.id));
1137             response.identity.id_length = responseInfo->info.identity.id_length;
1138
1139             response.result = CAToOCStackResult(responseInfo->result);
1140
1141             if(responseInfo->info.payload &&
1142                responseInfo->info.payloadSize)
1143             {
1144                 OCPayloadType type = PAYLOAD_TYPE_INVALID;
1145                 // check the security resource
1146                 if (SRMIsSecurityResourceURI(cbNode->requestUri))
1147                 {
1148                     type = PAYLOAD_TYPE_SECURITY;
1149                 }
1150                 else if (cbNode->method == OC_REST_DISCOVER)
1151                 {
1152                     if (strncmp(OC_RSRVD_WELL_KNOWN_URI,cbNode->requestUri,
1153                                 sizeof(OC_RSRVD_WELL_KNOWN_URI) - 1) == 0)
1154                     {
1155                         type = PAYLOAD_TYPE_DISCOVERY;
1156                     }
1157                     else if (strcmp(cbNode->requestUri, OC_RSRVD_DEVICE_URI) == 0)
1158                     {
1159                         type = PAYLOAD_TYPE_DEVICE;
1160                     }
1161                     else if (strcmp(cbNode->requestUri, OC_RSRVD_PLATFORM_URI) == 0)
1162                     {
1163                         type = PAYLOAD_TYPE_PLATFORM;
1164                     }
1165 #ifdef ROUTING_GATEWAY
1166                     else if (strcmp(cbNode->requestUri, OC_RSRVD_GATEWAY_URI) == 0)
1167                     {
1168                         type = PAYLOAD_TYPE_REPRESENTATION;
1169                     }
1170 #endif
1171                     else if (strcmp(cbNode->requestUri, OC_RSRVD_RD_URI) == 0)
1172                     {
1173                         type = PAYLOAD_TYPE_RD;
1174                     }
1175 #ifdef TCP_ADAPTER
1176                     else if (strcmp(cbNode->requestUri, KEEPALIVE_RESOURCE_URI) == 0)
1177                     {
1178                         type = PAYLOAD_TYPE_REPRESENTATION;
1179                     }
1180 #endif
1181                     else
1182                     {
1183                         OIC_LOG_V(ERROR, TAG, "Unknown Payload type in Discovery: %d %s",
1184                                 cbNode->method, cbNode->requestUri);
1185                         return;
1186                     }
1187                 }
1188                 else if (cbNode->method == OC_REST_GET ||
1189                          cbNode->method == OC_REST_PUT ||
1190                          cbNode->method == OC_REST_POST ||
1191                          cbNode->method == OC_REST_OBSERVE ||
1192                          cbNode->method == OC_REST_OBSERVE_ALL ||
1193                          cbNode->method == OC_REST_DELETE)
1194                 {
1195                     char targetUri[MAX_URI_LENGTH];
1196                     snprintf(targetUri, MAX_URI_LENGTH, "%s?rt=%s", OC_RSRVD_RD_URI,
1197                             OC_RSRVD_RESOURCE_TYPE_RDPUBLISH);
1198                     if (strcmp(targetUri, cbNode->requestUri) == 0)
1199                     {
1200                         type = PAYLOAD_TYPE_RD;
1201                     }
1202                     else if (strcmp(OC_RSRVD_PLATFORM_URI, cbNode->requestUri) == 0)
1203                     {
1204                         type = PAYLOAD_TYPE_PLATFORM;
1205                     }
1206                     else if (strcmp(OC_RSRVD_DEVICE_URI, cbNode->requestUri) == 0)
1207                     {
1208                         type = PAYLOAD_TYPE_DEVICE;
1209                     }
1210                     if (type == PAYLOAD_TYPE_INVALID)
1211                     {
1212                         OIC_LOG_V(INFO, TAG, "Assuming PAYLOAD_TYPE_REPRESENTATION: %d %s",
1213                                 cbNode->method, cbNode->requestUri);
1214                         type = PAYLOAD_TYPE_REPRESENTATION;
1215                     }
1216                 }
1217                 else
1218                 {
1219                     OIC_LOG_V(ERROR, TAG, "Unknown Payload type: %d %s",
1220                             cbNode->method, cbNode->requestUri);
1221                     return;
1222                 }
1223
1224                 if(OC_STACK_OK != OCParsePayload(&response.payload,
1225                             type,
1226                             responseInfo->info.payload,
1227                             responseInfo->info.payloadSize))
1228                 {
1229                     OIC_LOG(ERROR, TAG, "Error converting payload");
1230                     OCPayloadDestroy(response.payload);
1231                     return;
1232                 }
1233             }
1234
1235             response.numRcvdVendorSpecificHeaderOptions = 0;
1236             if(responseInfo->info.numOptions > 0)
1237             {
1238                 int start = 0;
1239                 //First option always with option ID is COAP_OPTION_OBSERVE if it is available.
1240                 if(responseInfo->info.options[0].optionID == COAP_OPTION_OBSERVE)
1241                 {
1242                     size_t i;
1243                     uint32_t observationOption;
1244                     uint8_t* optionData = (uint8_t*)responseInfo->info.options[0].optionData;
1245                     for (observationOption=0, i=0;
1246                             i<sizeof(uint32_t) && i<responseInfo->info.options[0].optionLength;
1247                             i++)
1248                     {
1249                         observationOption =
1250                             (observationOption << 8) | optionData[i];
1251                     }
1252                     response.sequenceNumber = observationOption;
1253
1254                     response.numRcvdVendorSpecificHeaderOptions = responseInfo->info.numOptions - 1;
1255                     start = 1;
1256                 }
1257                 else
1258                 {
1259                     response.numRcvdVendorSpecificHeaderOptions = responseInfo->info.numOptions;
1260                 }
1261
1262                 if(response.numRcvdVendorSpecificHeaderOptions > MAX_HEADER_OPTIONS)
1263                 {
1264                     OIC_LOG(ERROR, TAG, "#header options are more than MAX_HEADER_OPTIONS");
1265                     OCPayloadDestroy(response.payload);
1266                     return;
1267                 }
1268
1269                 for (uint8_t i = start; i < responseInfo->info.numOptions; i++)
1270                 {
1271                     memcpy (&(response.rcvdVendorSpecificHeaderOptions[i-start]),
1272                             &(responseInfo->info.options[i]), sizeof(OCHeaderOption));
1273                 }
1274             }
1275
1276             if (cbNode->method == OC_REST_OBSERVE &&
1277                 response.sequenceNumber > OC_OFFSET_SEQUENCE_NUMBER &&
1278                 response.sequenceNumber <= cbNode->sequenceNumber)
1279             {
1280                 OIC_LOG_V(INFO, TAG, "Received stale notification. Number :%d",
1281                                                  response.sequenceNumber);
1282             }
1283             else
1284             {
1285                 OCStackApplicationResult appFeedback = cbNode->callBack(cbNode->context,
1286                                                                         cbNode->handle,
1287                                                                         &response);
1288                 cbNode->sequenceNumber = response.sequenceNumber;
1289
1290                 if (appFeedback == OC_STACK_DELETE_TRANSACTION)
1291                 {
1292                     FindAndDeleteClientCB(cbNode);
1293                 }
1294                 else
1295                 {
1296                     // To keep discovery callbacks active.
1297                     cbNode->TTL = GetTicks(MAX_CB_TIMEOUT_SECONDS *
1298                                             MILLISECONDS_PER_SECOND);
1299                 }
1300             }
1301
1302             //Need to send ACK when the response is CON
1303             if(responseInfo->info.type == CA_MSG_CONFIRM)
1304             {
1305                 SendDirectStackResponse(endPoint, responseInfo->info.messageId, CA_EMPTY,
1306                         CA_MSG_ACKNOWLEDGE, 0, NULL, NULL, 0, NULL);
1307             }
1308
1309             OCPayloadDestroy(response.payload);
1310         }
1311         return;
1312     }
1313
1314     if(observer)
1315     {
1316         OIC_LOG(INFO, TAG, "There is an observer associated with the response token");
1317         if(responseInfo->result == CA_EMPTY)
1318         {
1319             OIC_LOG(INFO, TAG, "Receiving A ACK/RESET for this token");
1320             if(responseInfo->info.type == CA_MSG_RESET)
1321             {
1322                 OIC_LOG(INFO, TAG, "This is a RESET");
1323                 OCStackFeedBack(responseInfo->info.token, responseInfo->info.tokenLength,
1324                         OC_OBSERVER_NOT_INTERESTED);
1325             }
1326             else if(responseInfo->info.type == CA_MSG_ACKNOWLEDGE)
1327             {
1328                 OIC_LOG(INFO, TAG, "This is a pure ACK");
1329                 OCStackFeedBack(responseInfo->info.token, responseInfo->info.tokenLength,
1330                         OC_OBSERVER_STILL_INTERESTED);
1331             }
1332         }
1333         else if(responseInfo->result == CA_RETRANSMIT_TIMEOUT)
1334         {
1335             OIC_LOG(INFO, TAG, "Receiving Time Out for an observer");
1336             OCStackFeedBack(responseInfo->info.token, responseInfo->info.tokenLength,
1337                     OC_OBSERVER_FAILED_COMM);
1338         }
1339         return;
1340     }
1341
1342     if(!cbNode && !observer)
1343     {
1344         if(myStackMode == OC_CLIENT || myStackMode == OC_CLIENT_SERVER
1345            || myStackMode == OC_GATEWAY)
1346         {
1347             OIC_LOG(INFO, TAG, "This is a client, but no cbNode was found for token");
1348             if(responseInfo->result == CA_EMPTY)
1349             {
1350                 OIC_LOG(INFO, TAG, "Receiving CA_EMPTY in the ocstack");
1351             }
1352             else
1353             {
1354                 OIC_LOG(INFO, TAG, "Received a message without callbacks. Sending RESET");
1355                 SendDirectStackResponse(endPoint, responseInfo->info.messageId, CA_EMPTY,
1356                                         CA_MSG_RESET, 0, NULL, NULL, 0, NULL);
1357             }
1358         }
1359
1360         if(myStackMode == OC_SERVER || myStackMode == OC_CLIENT_SERVER
1361            || myStackMode == OC_GATEWAY)
1362         {
1363             OIC_LOG(INFO, TAG, "This is a server, but no observer was found for token");
1364             if (responseInfo->info.type == CA_MSG_ACKNOWLEDGE)
1365             {
1366                 OIC_LOG_V(INFO, TAG, "Received ACK at server for messageId : %d",
1367                                             responseInfo->info.messageId);
1368             }
1369             if (responseInfo->info.type == CA_MSG_RESET)
1370             {
1371                 OIC_LOG_V(INFO, TAG, "Received RESET at server for messageId : %d",
1372                                             responseInfo->info.messageId);
1373             }
1374         }
1375
1376         return;
1377     }
1378
1379     OIC_LOG(INFO, TAG, "Exit HandleCAResponses");
1380 }
1381
1382 void HandleCAResponses(const CAEndpoint_t* endPoint, const CAResponseInfo_t* responseInfo)
1383 {
1384     VERIFY_NON_NULL_NR(endPoint, FATAL);
1385     VERIFY_NON_NULL_NR(responseInfo, FATAL);
1386
1387     OIC_LOG(INFO, TAG, "Enter HandleCAResponses");
1388
1389 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
1390 #ifdef ROUTING_GATEWAY
1391     bool needRIHandling = false;
1392     /*
1393      * Routing manager is going to update either of endpoint or response or both.
1394      * This typecasting is done to avoid unnecessary duplication of Endpoint and responseInfo
1395      * RM can update "routeData" option in endPoint so that future RI requests can be sent to proper
1396      * destination.
1397      */
1398     OCStackResult ret = RMHandleResponse((CAResponseInfo_t *)responseInfo, (CAEndpoint_t *)endPoint,
1399                                          &needRIHandling);
1400     if(ret != OC_STACK_OK || !needRIHandling)
1401     {
1402         OIC_LOG_V(INFO, TAG, "Routing status![%d]. Not forwarding to RI", ret);
1403         return;
1404     }
1405 #endif
1406
1407     /*
1408      * Put source in sender endpoint so that the next packet from application can be routed to
1409      * proper destination and remove "RM" coap header option before passing request / response to
1410      * RI as this option will make no sense to either RI or application.
1411      */
1412     RMUpdateInfo((CAHeaderOption_t **) &(responseInfo->info.options),
1413                  (uint8_t *) &(responseInfo->info.numOptions),
1414                  (CAEndpoint_t *) endPoint);
1415 #endif
1416
1417     OCHandleResponse(endPoint, responseInfo);
1418
1419     OIC_LOG(INFO, TAG, "Exit HandleCAResponses");
1420 }
1421
1422 /*
1423  * This function handles error response from CA
1424  * code shall be added to handle the errors
1425  */
1426 void HandleCAErrorResponse(const CAEndpoint_t *endPoint, const CAErrorInfo_t *errrorInfo)
1427 {
1428     OIC_LOG(INFO, TAG, "Enter HandleCAErrorResponse");
1429
1430     if(NULL == endPoint)
1431     {
1432         OIC_LOG(ERROR, TAG, "endPoint is NULL");
1433         return;
1434     }
1435
1436     if(NULL == errrorInfo)
1437     {
1438         OIC_LOG(ERROR, TAG, "errrorInfo is NULL");
1439         return;
1440     }
1441     OIC_LOG(INFO, TAG, "Exit HandleCAErrorResponse");
1442 }
1443
1444 /*
1445  * This function sends out Direct Stack Responses. These are responses that are not coming
1446  * from the application entity handler. These responses have no payload and are usually ACKs,
1447  * RESETs or some error conditions that were caught by the stack.
1448  */
1449 OCStackResult SendDirectStackResponse(const CAEndpoint_t* endPoint, const uint16_t coapID,
1450         const CAResponseResult_t responseResult, const CAMessageType_t type,
1451         const uint8_t numOptions, const CAHeaderOption_t *options,
1452         CAToken_t token, uint8_t tokenLength, const char *resourceUri)
1453 {
1454     OIC_LOG(DEBUG, TAG, "Entering SendDirectStackResponse");
1455     CAResponseInfo_t respInfo = {
1456         .result = responseResult
1457     };
1458     respInfo.info.messageId = coapID;
1459     respInfo.info.numOptions = numOptions;
1460
1461     if (respInfo.info.numOptions)
1462     {
1463         respInfo.info.options =
1464             (CAHeaderOption_t *)OICCalloc(respInfo.info.numOptions, sizeof(CAHeaderOption_t));
1465         memcpy (respInfo.info.options, options,
1466                 sizeof(CAHeaderOption_t) * respInfo.info.numOptions);
1467
1468     }
1469
1470     respInfo.info.payload = NULL;
1471     respInfo.info.token = token;
1472     respInfo.info.tokenLength = tokenLength;
1473     respInfo.info.type = type;
1474     respInfo.info.resourceUri = OICStrdup (resourceUri);
1475     respInfo.info.acceptFormat = CA_FORMAT_UNDEFINED;
1476
1477 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
1478     // Add the destination to route option from the endpoint->routeData.
1479     bool doPost = false;
1480     OCStackResult result = RMAddInfo(endPoint->routeData, &respInfo, false, &doPost);
1481     if(OC_STACK_OK != result)
1482     {
1483         OIC_LOG_V(ERROR, TAG, "Add routing option failed [%d]", result);
1484         return result;
1485     }
1486     if (doPost)
1487     {
1488         OIC_LOG(DEBUG, TAG, "Sending a POST message for EMPTY ACK in Client Mode");
1489         CARequestInfo_t reqInfo = {.method = CA_POST };
1490         /* The following initialization is not done in a single initializer block as in
1491          * arduino, .c file is compiled as .cpp and moves it from C99 to C++11.  The latter
1492          * does not have designated initalizers. This is a work-around for now.
1493          */
1494         reqInfo.info.type = CA_MSG_NONCONFIRM;
1495         reqInfo.info.messageId = coapID;
1496         reqInfo.info.tokenLength = tokenLength;
1497         reqInfo.info.token = token;
1498         reqInfo.info.numOptions = respInfo.info.numOptions;
1499         reqInfo.info.payload = NULL;
1500         reqInfo.info.resourceUri = OICStrdup (OC_RSRVD_GATEWAY_URI);
1501         if (reqInfo.info.numOptions)
1502         {
1503             reqInfo.info.options =
1504                 (CAHeaderOption_t *)OICCalloc(reqInfo.info.numOptions, sizeof(CAHeaderOption_t));
1505             if (NULL == reqInfo.info.options)
1506             {
1507                 OIC_LOG(ERROR, TAG, "Calloc failed");
1508                 return OC_STACK_NO_MEMORY;
1509             }
1510             memcpy (reqInfo.info.options, respInfo.info.options,
1511                     sizeof(CAHeaderOption_t) * reqInfo.info.numOptions);
1512
1513         }
1514         CAResult_t caResult = CASendRequest(endPoint, &reqInfo);
1515         OICFree (reqInfo.info.resourceUri);
1516         OICFree (reqInfo.info.options);
1517         OICFree (respInfo.info.resourceUri);
1518         OICFree (respInfo.info.options);
1519         if (CA_STATUS_OK != caResult)
1520         {
1521             OIC_LOG(ERROR, TAG, "CASendRequest error");
1522             return CAResultToOCResult(caResult);
1523         }
1524     }
1525     else
1526 #endif
1527     {
1528         CAResult_t caResult = CASendResponse(endPoint, &respInfo);
1529
1530         // resourceUri in the info field is cloned in the CA layer and
1531         // thus ownership is still here.
1532         OICFree (respInfo.info.resourceUri);
1533         OICFree (respInfo.info.options);
1534         if(CA_STATUS_OK != caResult)
1535         {
1536             OIC_LOG(ERROR, TAG, "CASendResponse error");
1537             return CAResultToOCResult(caResult);
1538         }
1539     }
1540     OIC_LOG(DEBUG, TAG, "Exit SendDirectStackResponse");
1541     return OC_STACK_OK;
1542 }
1543
1544 OCStackResult HandleStackRequests(OCServerProtocolRequest * protocolRequest)
1545 {
1546     OIC_LOG(INFO, TAG, "Entering HandleStackRequests (OCStack Layer)");
1547     OCStackResult result = OC_STACK_ERROR;
1548     if(!protocolRequest)
1549     {
1550         OIC_LOG(ERROR, TAG, "protocolRequest is NULL");
1551         return OC_STACK_INVALID_PARAM;
1552     }
1553
1554     OCServerRequest * request = GetServerRequestUsingToken(protocolRequest->requestToken,
1555             protocolRequest->tokenLength);
1556     if(!request)
1557     {
1558         OIC_LOG(INFO, TAG, "This is a new Server Request");
1559         result = AddServerRequest(&request, protocolRequest->coapID,
1560                 protocolRequest->delayedResNeeded, 0, protocolRequest->method,
1561                 protocolRequest->numRcvdVendorSpecificHeaderOptions,
1562                 protocolRequest->observationOption, protocolRequest->qos,
1563                 protocolRequest->query, protocolRequest->rcvdVendorSpecificHeaderOptions,
1564                 protocolRequest->payload, protocolRequest->requestToken,
1565                 protocolRequest->tokenLength, protocolRequest->resourceUrl,
1566                 protocolRequest->reqTotalSize, protocolRequest->acceptFormat,
1567                 &protocolRequest->devAddr);
1568         if (OC_STACK_OK != result)
1569         {
1570             OIC_LOG(ERROR, TAG, "Error adding server request");
1571             return result;
1572         }
1573
1574         if(!request)
1575         {
1576             OIC_LOG(ERROR, TAG, "Out of Memory");
1577             return OC_STACK_NO_MEMORY;
1578         }
1579
1580         if(!protocolRequest->reqMorePacket)
1581         {
1582             request->requestComplete = 1;
1583         }
1584     }
1585     else
1586     {
1587         OIC_LOG(INFO, TAG, "This is either a repeated or blocked Server Request");
1588     }
1589
1590     if(request->requestComplete)
1591     {
1592         OIC_LOG(INFO, TAG, "This Server Request is complete");
1593         ResourceHandling resHandling = OC_RESOURCE_VIRTUAL;
1594         OCResource *resource = NULL;
1595         result = DetermineResourceHandling (request, &resHandling, &resource);
1596         if (result == OC_STACK_OK)
1597         {
1598             result = ProcessRequest(resHandling, resource, request);
1599         }
1600     }
1601     else
1602     {
1603         OIC_LOG(INFO, TAG, "This Server Request is incomplete");
1604         result = OC_STACK_CONTINUE;
1605     }
1606     return result;
1607 }
1608
1609 void OCHandleRequests(const CAEndpoint_t* endPoint, const CARequestInfo_t* requestInfo)
1610 {
1611     OIC_LOG(DEBUG, TAG, "Enter OCHandleRequests");
1612
1613 #ifdef TCP_ADAPTER
1614     if (requestInfo->info.resourceUri &&
1615             strcmp(requestInfo->info.resourceUri, KEEPALIVE_RESOURCE_URI) == 0)
1616     {
1617         HandleKeepAliveRequest(endPoint, requestInfo);
1618         return;
1619     }
1620 #endif
1621
1622     OCStackResult requestResult = OC_STACK_ERROR;
1623
1624     if(myStackMode == OC_CLIENT)
1625     {
1626         //TODO: should the client be responding to requests?
1627         return;
1628     }
1629
1630     OCServerProtocolRequest serverRequest = {0};
1631
1632     OIC_LOG_V(INFO, TAG, "Endpoint URI : %s", requestInfo->info.resourceUri);
1633
1634     char * uriWithoutQuery = NULL;
1635     char * query  = NULL;
1636
1637     requestResult = getQueryFromUri(requestInfo->info.resourceUri, &query, &uriWithoutQuery);
1638
1639     if (requestResult != OC_STACK_OK || !uriWithoutQuery)
1640     {
1641         OIC_LOG_V(ERROR, TAG, "getQueryFromUri() failed with OC error code %d\n", requestResult);
1642         return;
1643     }
1644     OIC_LOG_V(INFO, TAG, "URI without query: %s", uriWithoutQuery);
1645     OIC_LOG_V(INFO, TAG, "Query : %s", query);
1646
1647     if(strlen(uriWithoutQuery) < MAX_URI_LENGTH)
1648     {
1649         OICStrcpy(serverRequest.resourceUrl, sizeof(serverRequest.resourceUrl), uriWithoutQuery);
1650         OICFree(uriWithoutQuery);
1651     }
1652     else
1653     {
1654         OIC_LOG(ERROR, TAG, "URI length exceeds MAX_URI_LENGTH.");
1655         OICFree(uriWithoutQuery);
1656         OICFree(query);
1657         return;
1658     }
1659
1660     if(query)
1661     {
1662         if(strlen(query) < MAX_QUERY_LENGTH)
1663         {
1664             OICStrcpy(serverRequest.query, sizeof(serverRequest.query), query);
1665             OICFree(query);
1666         }
1667         else
1668         {
1669             OIC_LOG(ERROR, TAG, "Query length exceeds MAX_QUERY_LENGTH.");
1670             OICFree(query);
1671             return;
1672         }
1673     }
1674
1675     if ((requestInfo->info.payload) && (0 < requestInfo->info.payloadSize))
1676     {
1677         serverRequest.reqTotalSize = requestInfo->info.payloadSize;
1678         serverRequest.payload = (uint8_t *) OICMalloc(requestInfo->info.payloadSize);
1679         if (!serverRequest.payload)
1680         {
1681             OIC_LOG(ERROR, TAG, "Allocation for payload failed.");
1682             return;
1683         }
1684         memcpy (serverRequest.payload, requestInfo->info.payload,
1685                 requestInfo->info.payloadSize);
1686     }
1687     else
1688     {
1689         serverRequest.reqTotalSize = 0;
1690     }
1691
1692     switch (requestInfo->method)
1693     {
1694         case CA_GET:
1695             serverRequest.method = OC_REST_GET;
1696             break;
1697         case CA_PUT:
1698             serverRequest.method = OC_REST_PUT;
1699             break;
1700         case CA_POST:
1701             serverRequest.method = OC_REST_POST;
1702             break;
1703         case CA_DELETE:
1704             serverRequest.method = OC_REST_DELETE;
1705             break;
1706         default:
1707             OIC_LOG_V(ERROR, TAG, "Received CA method %d not supported", requestInfo->method);
1708             SendDirectStackResponse(endPoint, requestInfo->info.messageId, CA_BAD_REQ,
1709                         requestInfo->info.type, requestInfo->info.numOptions,
1710                         requestInfo->info.options, requestInfo->info.token,
1711                         requestInfo->info.tokenLength, requestInfo->info.resourceUri);
1712             OICFree(serverRequest.payload);
1713             return;
1714     }
1715
1716     OIC_LOG_BUFFER(INFO, TAG, (const uint8_t *)requestInfo->info.token,
1717             requestInfo->info.tokenLength);
1718
1719     serverRequest.tokenLength = requestInfo->info.tokenLength;
1720     if (serverRequest.tokenLength) {
1721         // Non empty token
1722         serverRequest.requestToken = (CAToken_t)OICMalloc(requestInfo->info.tokenLength);
1723
1724         if (!serverRequest.requestToken)
1725         {
1726             OIC_LOG(FATAL, TAG, "Allocation for token failed.");
1727             SendDirectStackResponse(endPoint, requestInfo->info.messageId, CA_INTERNAL_SERVER_ERROR,
1728                     requestInfo->info.type, requestInfo->info.numOptions,
1729                     requestInfo->info.options, requestInfo->info.token,
1730                     requestInfo->info.tokenLength, requestInfo->info.resourceUri);
1731             OICFree(serverRequest.payload);
1732             return;
1733         }
1734         memcpy(serverRequest.requestToken, requestInfo->info.token, requestInfo->info.tokenLength);
1735     }
1736
1737     switch (requestInfo->info.acceptFormat)
1738     {
1739         case CA_FORMAT_APPLICATION_CBOR:
1740             serverRequest.acceptFormat = OC_FORMAT_CBOR;
1741             break;
1742         case CA_FORMAT_UNDEFINED:
1743             serverRequest.acceptFormat = OC_FORMAT_UNDEFINED;
1744             break;
1745         default:
1746             serverRequest.acceptFormat = OC_FORMAT_UNSUPPORTED;
1747     }
1748
1749     if (requestInfo->info.type == CA_MSG_CONFIRM)
1750     {
1751         serverRequest.qos = OC_HIGH_QOS;
1752     }
1753     else
1754     {
1755         serverRequest.qos = OC_LOW_QOS;
1756     }
1757     // CA does not need the following field
1758     // Are we sure CA does not need them? how is it responding to multicast
1759     serverRequest.delayedResNeeded = 0;
1760
1761     serverRequest.coapID = requestInfo->info.messageId;
1762
1763     CopyEndpointToDevAddr(endPoint, &serverRequest.devAddr);
1764
1765     // copy vendor specific header options
1766     uint8_t tempNum = (requestInfo->info.numOptions);
1767
1768     // Assume no observation requested and it is a pure GET.
1769     // If obs registration/de-registration requested it'll be fetched from the
1770     // options in GetObserveHeaderOption()
1771     serverRequest.observationOption = OC_OBSERVE_NO_OPTION;
1772
1773     GetObserveHeaderOption(&serverRequest.observationOption, requestInfo->info.options, &tempNum);
1774     if (requestInfo->info.numOptions > MAX_HEADER_OPTIONS)
1775     {
1776         OIC_LOG(ERROR, TAG,
1777                 "The request info numOptions is greater than MAX_HEADER_OPTIONS");
1778         SendDirectStackResponse(endPoint, requestInfo->info.messageId, CA_BAD_OPT,
1779                 requestInfo->info.type, requestInfo->info.numOptions,
1780                 requestInfo->info.options, requestInfo->info.token,
1781                 requestInfo->info.tokenLength, requestInfo->info.resourceUri);
1782         OICFree(serverRequest.payload);
1783         OICFree(serverRequest.requestToken);
1784         return;
1785     }
1786     serverRequest.numRcvdVendorSpecificHeaderOptions = tempNum;
1787     if (serverRequest.numRcvdVendorSpecificHeaderOptions)
1788     {
1789         memcpy (&(serverRequest.rcvdVendorSpecificHeaderOptions), requestInfo->info.options,
1790             sizeof(CAHeaderOption_t)*tempNum);
1791     }
1792
1793     requestResult = HandleStackRequests (&serverRequest);
1794
1795     // Send ACK to client as precursor to slow response
1796     if(requestResult == OC_STACK_SLOW_RESOURCE)
1797     {
1798         SendDirectStackResponse(endPoint, requestInfo->info.messageId, CA_EMPTY,
1799                     CA_MSG_ACKNOWLEDGE,0, NULL, NULL, 0, NULL);
1800     }
1801     else if(requestResult != OC_STACK_OK)
1802     {
1803         OIC_LOG_V(ERROR, TAG, "HandleStackRequests failed. error: %d", requestResult);
1804
1805         CAResponseResult_t stackResponse =
1806             OCToCAStackResult(requestResult, serverRequest.method);
1807
1808         SendDirectStackResponse(endPoint, requestInfo->info.messageId, stackResponse,
1809                 requestInfo->info.type, requestInfo->info.numOptions,
1810                 requestInfo->info.options, requestInfo->info.token,
1811                 requestInfo->info.tokenLength, requestInfo->info.resourceUri);
1812     }
1813     // requestToken is fed to HandleStackRequests, which then goes to AddServerRequest.
1814     // The token is copied in there, and is thus still owned by this function.
1815     OICFree(serverRequest.payload);
1816     OICFree(serverRequest.requestToken);
1817     OIC_LOG(INFO, TAG, "Exit OCHandleRequests");
1818 }
1819
1820 //This function will be called back by CA layer when a request is received
1821 void HandleCARequests(const CAEndpoint_t* endPoint, const CARequestInfo_t* requestInfo)
1822 {
1823     OIC_LOG(INFO, TAG, "Enter HandleCARequests");
1824     if(!endPoint)
1825     {
1826         OIC_LOG(ERROR, TAG, "endPoint is NULL");
1827         return;
1828     }
1829
1830     if(!requestInfo)
1831     {
1832         OIC_LOG(ERROR, TAG, "requestInfo is NULL");
1833         return;
1834     }
1835
1836 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
1837 #ifdef ROUTING_GATEWAY
1838     bool needRIHandling = false;
1839     bool isEmptyMsg = false;
1840     /*
1841      * Routing manager is going to update either of endpoint or request or both.
1842      * This typecasting is done to avoid unnecessary duplication of Endpoint and requestInfo
1843      * RM can update "routeData" option in endPoint so that future RI requests can be sent to proper
1844      * destination. It can also remove "RM" coap header option before passing request / response to
1845      * RI as this option will make no sense to either RI or application.
1846      */
1847     OCStackResult ret = RMHandleRequest((CARequestInfo_t *)requestInfo, (CAEndpoint_t *)endPoint,
1848                                         &needRIHandling, &isEmptyMsg);
1849     if(OC_STACK_OK != ret || !needRIHandling)
1850     {
1851         OIC_LOG_V(INFO, TAG, "Routing status![%d]. Not forwarding to RI", ret);
1852         return;
1853     }
1854 #endif
1855
1856     /*
1857      * Put source in sender endpoint so that the next packet from application can be routed to
1858      * proper destination and remove RM header option.
1859      */
1860     RMUpdateInfo((CAHeaderOption_t **) &(requestInfo->info.options),
1861                  (uint8_t *) &(requestInfo->info.numOptions),
1862                  (CAEndpoint_t *) endPoint);
1863
1864 #ifdef ROUTING_GATEWAY
1865     if (isEmptyMsg)
1866     {
1867         /*
1868          * In Gateways, the MSGType in route option is used to check if the actual
1869          * response is EMPTY message(4 bytes CoAP Header).  In case of Client, the
1870          * EMPTY response is sent in the form of POST request which need to be changed
1871          * to a EMPTY response by RM.  This translation is done in this part of the code.
1872          */
1873         OIC_LOG(INFO, TAG, "This is a Empty response from the Client");
1874         CAResponseInfo_t respInfo = {.result = CA_EMPTY,
1875                                      .info.messageId = requestInfo->info.messageId,
1876                                      .info.type = CA_MSG_ACKNOWLEDGE};
1877         OCHandleResponse(endPoint, &respInfo);
1878     }
1879     else
1880 #endif
1881 #endif
1882     {
1883         // Normal handling of the packet
1884         OCHandleRequests(endPoint, requestInfo);
1885     }
1886     OIC_LOG(INFO, TAG, "Exit HandleCARequests");
1887 }
1888
1889 bool validatePlatformInfo(OCPlatformInfo info)
1890 {
1891
1892     if (!info.platformID)
1893     {
1894         OIC_LOG(ERROR, TAG, "No platform ID found.");
1895         return false;
1896     }
1897
1898     if (info.manufacturerName)
1899     {
1900         size_t lenManufacturerName = strlen(info.manufacturerName);
1901
1902         if(lenManufacturerName == 0 || lenManufacturerName > MAX_MANUFACTURER_NAME_LENGTH)
1903         {
1904             OIC_LOG(ERROR, TAG, "Manufacturer name fails length requirements.");
1905             return false;
1906         }
1907     }
1908     else
1909     {
1910         OIC_LOG(ERROR, TAG, "No manufacturer name present");
1911         return false;
1912     }
1913
1914     if (info.manufacturerUrl)
1915     {
1916         if(strlen(info.manufacturerUrl) > MAX_MANUFACTURER_URL_LENGTH)
1917         {
1918             OIC_LOG(ERROR, TAG, "Manufacturer url fails length requirements.");
1919             return false;
1920         }
1921     }
1922     return true;
1923 }
1924
1925 //-----------------------------------------------------------------------------
1926 // Public APIs
1927 //-----------------------------------------------------------------------------
1928 #ifdef RA_ADAPTER
1929 OCStackResult OCSetRAInfo(const OCRAInfo_t *raInfo)
1930 {
1931     if (!raInfo           ||
1932         !raInfo->username ||
1933         !raInfo->hostname ||
1934         !raInfo->xmpp_domain)
1935     {
1936
1937         return OC_STACK_INVALID_PARAM;
1938     }
1939     OCStackResult result = CAResultToOCResult(CASetRAInfo((const CARAInfo_t *) raInfo));
1940     gRASetInfo = (result == OC_STACK_OK)? true : false;
1941
1942     return result;
1943 }
1944 #endif
1945
1946 OCStackResult OCInit(const char *ipAddr, uint16_t port, OCMode mode)
1947 {
1948     (void) ipAddr;
1949     (void) port;
1950     return OCInit1(mode, OC_DEFAULT_FLAGS, OC_DEFAULT_FLAGS);
1951 }
1952
1953 OCStackResult OCInit1(OCMode mode, OCTransportFlags serverFlags, OCTransportFlags clientFlags)
1954 {
1955     if(stackState == OC_STACK_INITIALIZED)
1956     {
1957         OIC_LOG(INFO, TAG, "Subsequent calls to OCInit() without calling \
1958                 OCStop() between them are ignored.");
1959         return OC_STACK_OK;
1960     }
1961
1962 #ifndef ROUTING_GATEWAY
1963     if (OC_GATEWAY == mode)
1964     {
1965         OIC_LOG(ERROR, TAG, "Routing Manager not supported");
1966         return OC_STACK_INVALID_PARAM;
1967     }
1968 #endif
1969
1970 #ifdef RA_ADAPTER
1971     if(!gRASetInfo)
1972     {
1973         OIC_LOG(ERROR, TAG, "Need to call OCSetRAInfo before calling OCInit");
1974         return OC_STACK_ERROR;
1975     }
1976 #endif
1977
1978     OCStackResult result = OC_STACK_ERROR;
1979     OIC_LOG(INFO, TAG, "Entering OCInit");
1980
1981     // Validate mode
1982     if (!((mode == OC_CLIENT) || (mode == OC_SERVER) || (mode == OC_CLIENT_SERVER)
1983         || (mode == OC_GATEWAY)))
1984     {
1985         OIC_LOG(ERROR, TAG, "Invalid mode");
1986         return OC_STACK_ERROR;
1987     }
1988     myStackMode = mode;
1989
1990     if (mode == OC_CLIENT || mode == OC_CLIENT_SERVER || mode == OC_GATEWAY)
1991     {
1992         caglobals.client = true;
1993     }
1994     if (mode == OC_SERVER || mode == OC_CLIENT_SERVER || mode == OC_GATEWAY)
1995     {
1996         caglobals.server = true;
1997     }
1998
1999     caglobals.serverFlags = (CATransportFlags_t)serverFlags;
2000     if (!(caglobals.serverFlags & CA_IPFAMILY_MASK))
2001     {
2002         caglobals.serverFlags = (CATransportFlags_t)(caglobals.serverFlags|CA_IPV4|CA_IPV6);
2003     }
2004     caglobals.clientFlags = (CATransportFlags_t)clientFlags;
2005     if (!(caglobals.clientFlags & CA_IPFAMILY_MASK))
2006     {
2007         caglobals.clientFlags = (CATransportFlags_t)(caglobals.clientFlags|CA_IPV4|CA_IPV6);
2008     }
2009
2010     defaultDeviceHandler = NULL;
2011     defaultDeviceHandlerCallbackParameter = NULL;
2012
2013     result = CAResultToOCResult(CAInitialize());
2014     VERIFY_SUCCESS(result, OC_STACK_OK);
2015
2016     result = CAResultToOCResult(OCSelectNetwork());
2017     VERIFY_SUCCESS(result, OC_STACK_OK);
2018
2019     switch (myStackMode)
2020     {
2021         case OC_CLIENT:
2022             CARegisterHandler(HandleCARequests, HandleCAResponses, HandleCAErrorResponse);
2023             result = CAResultToOCResult(CAStartDiscoveryServer());
2024             OIC_LOG(INFO, TAG, "Client mode: CAStartDiscoveryServer");
2025             break;
2026         case OC_SERVER:
2027             SRMRegisterHandler(HandleCARequests, HandleCAResponses, HandleCAErrorResponse);
2028             result = CAResultToOCResult(CAStartListeningServer());
2029             OIC_LOG(INFO, TAG, "Server mode: CAStartListeningServer");
2030             break;
2031         case OC_CLIENT_SERVER:
2032         case OC_GATEWAY:
2033             SRMRegisterHandler(HandleCARequests, HandleCAResponses, HandleCAErrorResponse);
2034             result = CAResultToOCResult(CAStartListeningServer());
2035             if(result == OC_STACK_OK)
2036             {
2037                 result = CAResultToOCResult(CAStartDiscoveryServer());
2038             }
2039             break;
2040     }
2041     VERIFY_SUCCESS(result, OC_STACK_OK);
2042
2043 #ifdef TCP_ADAPTER
2044     CARegisterKeepAliveHandler(HandleKeepAliveConnCB);
2045 #endif
2046
2047 #ifdef WITH_PRESENCE
2048     PresenceTimeOutSize = sizeof (PresenceTimeOut) / sizeof (PresenceTimeOut[0]) - 1;
2049 #endif // WITH_PRESENCE
2050
2051     //Update Stack state to initialized
2052     stackState = OC_STACK_INITIALIZED;
2053
2054     // Initialize resource
2055     if(myStackMode != OC_CLIENT)
2056     {
2057         result = initResources();
2058     }
2059
2060     // Initialize the SRM Policy Engine
2061     if(result == OC_STACK_OK)
2062     {
2063         result = SRMInitPolicyEngine();
2064         // TODO after BeachHead delivery: consolidate into single SRMInit()
2065     }
2066 #if defined (ROUTING_GATEWAY) || defined (ROUTING_EP)
2067     RMSetStackMode(mode);
2068 #ifdef ROUTING_GATEWAY
2069     if (OC_GATEWAY == myStackMode)
2070     {
2071         result = RMInitialize();
2072     }
2073 #endif
2074 #endif
2075
2076 #ifdef TCP_ADAPTER
2077     if (result == OC_STACK_OK)
2078     {
2079         result = InitializeKeepAlive(myStackMode);
2080     }
2081 #endif
2082
2083 exit:
2084     if(result != OC_STACK_OK)
2085     {
2086         OIC_LOG(ERROR, TAG, "Stack initialization error");
2087         deleteAllResources();
2088         CATerminate();
2089         stackState = OC_STACK_UNINITIALIZED;
2090     }
2091     return result;
2092 }
2093
2094 OCStackResult OCStop()
2095 {
2096     OIC_LOG(INFO, TAG, "Entering OCStop");
2097
2098     if (stackState == OC_STACK_UNINIT_IN_PROGRESS)
2099     {
2100         OIC_LOG(DEBUG, TAG, "Stack already stopping, exiting");
2101         return OC_STACK_OK;
2102     }
2103     else if (stackState != OC_STACK_INITIALIZED)
2104     {
2105         OIC_LOG(ERROR, TAG, "Stack not initialized");
2106         return OC_STACK_ERROR;
2107     }
2108
2109     stackState = OC_STACK_UNINIT_IN_PROGRESS;
2110
2111 #ifdef WITH_PRESENCE
2112     // Ensure that the TTL associated with ANY and ALL presence notifications originating from
2113     // here send with the code "OC_STACK_PRESENCE_STOPPED" result.
2114     presenceResource.presenceTTL = 0;
2115 #endif // WITH_PRESENCE
2116
2117 #ifdef ROUTING_GATEWAY
2118     if (OC_GATEWAY == myStackMode)
2119     {
2120         RMTerminate();
2121     }
2122 #endif
2123
2124 #ifdef TCP_ADAPTER
2125     TerminateKeepAlive(myStackMode);
2126 #endif
2127
2128     // Free memory dynamically allocated for resources
2129     deleteAllResources();
2130     DeleteDeviceInfo();
2131     DeletePlatformInfo();
2132     CATerminate();
2133     // Remove all observers
2134     DeleteObserverList();
2135     // Remove all the client callbacks
2136     DeleteClientCBList();
2137
2138     // De-init the SRM Policy Engine
2139     // TODO after BeachHead delivery: consolidate into single SRMDeInit()
2140     SRMDeInitPolicyEngine();
2141
2142
2143     stackState = OC_STACK_UNINITIALIZED;
2144     return OC_STACK_OK;
2145 }
2146
2147 OCStackResult OCStartMulticastServer()
2148 {
2149     if(stackState != OC_STACK_INITIALIZED)
2150     {
2151         OIC_LOG(ERROR, TAG, "OCStack is not initalized. Cannot start multicast server.");
2152         return OC_STACK_ERROR;
2153     }
2154     CAResult_t ret = CAStartListeningServer();
2155     if (CA_STATUS_OK != ret)
2156     {
2157         OIC_LOG_V(ERROR, TAG, "Failed starting listening server: %d", ret);
2158         return OC_STACK_ERROR;
2159     }
2160     return OC_STACK_OK;
2161 }
2162
2163 OCStackResult OCStopMulticastServer()
2164 {
2165     CAResult_t ret = CAStopListeningServer();
2166     if (CA_STATUS_OK != ret)
2167     {
2168         OIC_LOG_V(ERROR, TAG, "Failed stopping listening server: %d", ret);
2169         return OC_STACK_ERROR;
2170     }
2171     return OC_STACK_OK;
2172 }
2173
2174 CAMessageType_t qualityOfServiceToMessageType(OCQualityOfService qos)
2175 {
2176     switch (qos)
2177     {
2178         case OC_HIGH_QOS:
2179             return CA_MSG_CONFIRM;
2180         case OC_LOW_QOS:
2181         case OC_MEDIUM_QOS:
2182         case OC_NA_QOS:
2183         default:
2184             return CA_MSG_NONCONFIRM;
2185     }
2186 }
2187
2188 OCStackResult verifyUriQueryLength(const char *inputUri, uint16_t uriLen)
2189 {
2190     char *query;
2191
2192     query = strchr (inputUri, '?');
2193
2194     if (query != NULL)
2195     {
2196         if((query - inputUri) > MAX_URI_LENGTH)
2197         {
2198             return OC_STACK_INVALID_URI;
2199         }
2200
2201         if((inputUri + uriLen - 1 - query) > MAX_QUERY_LENGTH)
2202         {
2203             return OC_STACK_INVALID_QUERY;
2204         }
2205     }
2206     else if(uriLen > MAX_URI_LENGTH)
2207     {
2208         return OC_STACK_INVALID_URI;
2209     }
2210     return OC_STACK_OK;
2211 }
2212
2213 /**
2214  *  A request uri consists of the following components in order:
2215  *                              example
2216  *  optionally one of
2217  *      CoAP over UDP prefix    "coap://"
2218  *      CoAP over TCP prefix    "coap+tcp://"
2219  *  optionally one of
2220  *      IPv6 address            "[1234::5678]"
2221  *      IPv4 address            "192.168.1.1"
2222  *  optional port               ":5683"
2223  *  resource uri                "/oc/core..."
2224  *
2225  *  for PRESENCE requests, extract resource type.
2226  */
2227 static OCStackResult ParseRequestUri(const char *fullUri,
2228                                         OCTransportAdapter adapter,
2229                                         OCTransportFlags flags,
2230                                         OCDevAddr **devAddr,
2231                                         char **resourceUri,
2232                                         char **resourceType)
2233 {
2234     VERIFY_NON_NULL(fullUri, FATAL, OC_STACK_INVALID_CALLBACK);
2235
2236     OCStackResult result = OC_STACK_OK;
2237     OCDevAddr *da = NULL;
2238     char *colon = NULL;
2239     char *end;
2240
2241     // provide defaults for all returned values
2242     if (devAddr)
2243     {
2244         *devAddr = NULL;
2245     }
2246     if (resourceUri)
2247     {
2248         *resourceUri = NULL;
2249     }
2250     if (resourceType)
2251     {
2252         *resourceType = NULL;
2253     }
2254
2255     // delimit url prefix, if any
2256     const char *start = fullUri;
2257     char *slash2 = strstr(start, "//");
2258     if (slash2)
2259     {
2260         start = slash2 + 2;
2261     }
2262     char *slash = strchr(start, '/');
2263     if (!slash)
2264     {
2265         return OC_STACK_INVALID_URI;
2266     }
2267
2268     // process url scheme
2269     size_t prefixLen = slash2 - fullUri;
2270     bool istcp = false;
2271     if (prefixLen)
2272     {
2273         if ((prefixLen == sizeof(COAP_TCP) - 1) && (!strncmp(fullUri, COAP_TCP, prefixLen)))
2274         {
2275             istcp = true;
2276         }
2277     }
2278
2279     // TODO: this logic should come in with unit tests exercising the various strings
2280     // processs url prefix, if any
2281     size_t urlLen = slash - start;
2282     // port
2283     uint16_t port = 0;
2284     size_t len = 0;
2285     if (urlLen && devAddr)
2286     {   // construct OCDevAddr
2287         if (start[0] == '[')
2288         {   // ipv6 address
2289             char *close = strchr(++start, ']');
2290             if (!close || close > slash)
2291             {
2292                 return OC_STACK_INVALID_URI;
2293             }
2294             end = close;
2295             if (close[1] == ':')
2296             {
2297                 colon = close + 1;
2298             }
2299
2300             if (istcp)
2301             {
2302                 adapter = (OCTransportAdapter)(adapter | OC_ADAPTER_TCP);
2303             }
2304             else
2305             {
2306                 adapter = (OCTransportAdapter)(adapter | OC_ADAPTER_IP);
2307             }
2308             flags = (OCTransportFlags)(flags | OC_IP_USE_V6);
2309         }
2310         else
2311         {
2312             char *dot = strchr(start, '.');
2313             if (dot && dot < slash)
2314             {   // ipv4 address
2315                 colon = strchr(start, ':');
2316                 end = (colon && colon < slash) ? colon : slash;
2317
2318                 if (istcp)
2319                 {
2320                     // coap over tcp
2321                     adapter = (OCTransportAdapter)(adapter | OC_ADAPTER_TCP);
2322                 }
2323                 else
2324                 {
2325                     adapter = (OCTransportAdapter)(adapter | OC_ADAPTER_IP);
2326                 }
2327                 flags = (OCTransportFlags)(flags | OC_IP_USE_V4);
2328             }
2329             else
2330             {   // MAC address
2331                 end = slash;
2332             }
2333         }
2334         len = end - start;
2335         if (len >= sizeof(da->addr))
2336         {
2337             return OC_STACK_INVALID_URI;
2338         }
2339         // collect port, if any
2340         if (colon && colon < slash)
2341         {
2342             for (colon++; colon < slash; colon++)
2343             {
2344                 char c = colon[0];
2345                 if (c < '0' || c > '9')
2346                 {
2347                     return OC_STACK_INVALID_URI;
2348                 }
2349                 port = 10 * port + c - '0';
2350             }
2351         }
2352
2353         len = end - start;
2354         if (len >= sizeof(da->addr))
2355         {
2356             return OC_STACK_INVALID_URI;
2357         }
2358
2359         da = (OCDevAddr *)OICCalloc(sizeof (OCDevAddr), 1);
2360         if (!da)
2361         {
2362             return OC_STACK_NO_MEMORY;
2363         }
2364         OICStrcpyPartial(da->addr, sizeof(da->addr), start, len);
2365         da->port = port;
2366         da->adapter = adapter;
2367         da->flags = flags;
2368         if (!strncmp(fullUri, "coaps:", 6))
2369         {
2370             da->flags = (OCTransportFlags)(da->flags|CA_SECURE);
2371         }
2372         *devAddr = da;
2373     }
2374
2375     // process resource uri, if any
2376     if (slash)
2377     {   // request uri and query
2378         size_t ulen = strlen(slash); // resource uri length
2379         size_t tlen = 0;      // resource type length
2380         char *type = NULL;
2381
2382         static const char strPresence[] = "/oic/ad?rt=";
2383         static const size_t lenPresence = sizeof(strPresence) - 1;
2384         if (!strncmp(slash, strPresence, lenPresence))
2385         {
2386             type = slash + lenPresence;
2387             tlen = ulen - lenPresence;
2388         }
2389         // resource uri
2390         if (resourceUri)
2391         {
2392             *resourceUri = (char *)OICMalloc(ulen + 1);
2393             if (!*resourceUri)
2394             {
2395                 result = OC_STACK_NO_MEMORY;
2396                 goto error;
2397             }
2398             strcpy(*resourceUri, slash);
2399         }
2400         // resource type
2401         if (type && resourceType)
2402         {
2403             *resourceType = (char *)OICMalloc(tlen + 1);
2404             if (!*resourceType)
2405             {
2406                 result = OC_STACK_NO_MEMORY;
2407                 goto error;
2408             }
2409
2410             OICStrcpy(*resourceType, (tlen+1), type);
2411         }
2412     }
2413
2414     return OC_STACK_OK;
2415
2416 error:
2417     // free all returned values
2418     if (devAddr)
2419     {
2420         OICFree(*devAddr);
2421     }
2422     if (resourceUri)
2423     {
2424         OICFree(*resourceUri);
2425     }
2426     if (resourceType)
2427     {
2428         OICFree(*resourceType);
2429     }
2430     return result;
2431 }
2432
2433 static OCStackResult OCPreparePresence(CAEndpoint_t *endpoint,
2434                                         char *resourceUri, char **requestUri)
2435 {
2436     char uri[CA_MAX_URI_LENGTH];
2437
2438     FormCanonicalPresenceUri(endpoint, resourceUri, uri);
2439
2440     *requestUri = OICStrdup(uri);
2441     if (!*requestUri)
2442     {
2443         return OC_STACK_NO_MEMORY;
2444     }
2445
2446     return OC_STACK_OK;
2447 }
2448
2449 /**
2450  * Discover or Perform requests on a specified resource
2451  */
2452 OCStackResult OCDoResource(OCDoHandle *handle,
2453                             OCMethod method,
2454                             const char *requestUri,
2455                             const OCDevAddr *destination,
2456                             OCPayload* payload,
2457                             OCConnectivityType connectivityType,
2458                             OCQualityOfService qos,
2459                             OCCallbackData *cbData,
2460                             OCHeaderOption *options,
2461                             uint8_t numOptions)
2462 {
2463     OIC_LOG(INFO, TAG, "Entering OCDoResource");
2464
2465     // Validate input parameters
2466     VERIFY_NON_NULL(cbData, FATAL, OC_STACK_INVALID_CALLBACK);
2467     VERIFY_NON_NULL(cbData->cb, FATAL, OC_STACK_INVALID_CALLBACK);
2468     VERIFY_NON_NULL(requestUri , FATAL, OC_STACK_INVALID_URI);
2469
2470     OCStackResult result = OC_STACK_ERROR;
2471     CAResult_t caResult;
2472     CAToken_t token = NULL;
2473     uint8_t tokenLength = CA_MAX_TOKEN_LEN;
2474     ClientCB *clientCB = NULL;
2475     OCDoHandle resHandle = NULL;
2476     CAEndpoint_t endpoint = {.adapter = CA_DEFAULT_ADAPTER};
2477     OCDevAddr tmpDevAddr = { OC_DEFAULT_ADAPTER };
2478     uint32_t ttl = 0;
2479     OCTransportAdapter adapter;
2480     OCTransportFlags flags;
2481     // the request contents are put here
2482     CARequestInfo_t requestInfo = {.method = CA_GET};
2483     // requestUri  will be parsed into the following three variables
2484     OCDevAddr *devAddr = NULL;
2485     char *resourceUri = NULL;
2486     char *resourceType = NULL;
2487
2488     // This validation is broken, but doesn't cause harm
2489     size_t uriLen = strlen(requestUri );
2490     if ((result = verifyUriQueryLength(requestUri , uriLen)) != OC_STACK_OK)
2491     {
2492         goto exit;
2493     }
2494
2495     /*
2496      * Support original behavior with address on resourceUri argument.
2497      */
2498     adapter = (OCTransportAdapter)(connectivityType >> CT_ADAPTER_SHIFT);
2499     flags = (OCTransportFlags)(connectivityType & CT_MASK_FLAGS);
2500
2501     result = ParseRequestUri(requestUri, adapter, flags, &devAddr, &resourceUri, &resourceType);
2502
2503     if (result != OC_STACK_OK)
2504     {
2505         OIC_LOG_V(DEBUG, TAG, "Unable to parse uri: %s", requestUri);
2506         goto exit;
2507     }
2508
2509     switch (method)
2510     {
2511     case OC_REST_GET:
2512     case OC_REST_OBSERVE:
2513     case OC_REST_OBSERVE_ALL:
2514     case OC_REST_CANCEL_OBSERVE:
2515         requestInfo.method = CA_GET;
2516         break;
2517     case OC_REST_PUT:
2518         requestInfo.method = CA_PUT;
2519         break;
2520     case OC_REST_POST:
2521         requestInfo.method = CA_POST;
2522         break;
2523     case OC_REST_DELETE:
2524         requestInfo.method = CA_DELETE;
2525         break;
2526     case OC_REST_DISCOVER:
2527         qos = OC_LOW_QOS;
2528         if (destination || devAddr)
2529         {
2530             requestInfo.isMulticast = false;
2531         }
2532         else
2533         {
2534             tmpDevAddr.adapter = adapter;
2535             tmpDevAddr.flags = flags;
2536             destination = &tmpDevAddr;
2537             requestInfo.isMulticast = true;
2538         }
2539         // CA_DISCOVER will become GET and isMulticast
2540         requestInfo.method = CA_GET;
2541         break;
2542 #ifdef WITH_PRESENCE
2543     case OC_REST_PRESENCE:
2544         // Replacing method type with GET because "presence"
2545         // is a stack layer only implementation.
2546         requestInfo.method = CA_GET;
2547         break;
2548 #endif
2549     default:
2550         result = OC_STACK_INVALID_METHOD;
2551         goto exit;
2552     }
2553
2554     if (!devAddr && !destination)
2555     {
2556         OIC_LOG(DEBUG, TAG, "no devAddr and no destination");
2557         result = OC_STACK_INVALID_PARAM;
2558         goto exit;
2559     }
2560
2561     /* If not original behavior, use destination argument */
2562     if (destination && !devAddr)
2563     {
2564         devAddr = (OCDevAddr *)OICMalloc(sizeof (OCDevAddr));
2565         if (!devAddr)
2566         {
2567             result = OC_STACK_NO_MEMORY;
2568             goto exit;
2569         }
2570         *devAddr = *destination;
2571     }
2572
2573     resHandle = GenerateInvocationHandle();
2574     if (!resHandle)
2575     {
2576         result = OC_STACK_NO_MEMORY;
2577         goto exit;
2578     }
2579
2580     caResult = CAGenerateToken(&token, tokenLength);
2581     if (caResult != CA_STATUS_OK)
2582     {
2583         OIC_LOG(ERROR, TAG, "CAGenerateToken error");
2584         result= OC_STACK_ERROR;
2585         goto exit;
2586     }
2587
2588     // fill in request data
2589     requestInfo.info.type = qualityOfServiceToMessageType(qos);
2590     requestInfo.info.token = token;
2591     requestInfo.info.tokenLength = tokenLength;
2592     requestInfo.info.resourceUri = resourceUri;
2593
2594     if ((method == OC_REST_OBSERVE) || (method == OC_REST_OBSERVE_ALL))
2595     {
2596         result = CreateObserveHeaderOption (&(requestInfo.info.options),
2597                                     options, numOptions, OC_OBSERVE_REGISTER);
2598         if (result != OC_STACK_OK)
2599         {
2600             goto exit;
2601         }
2602         requestInfo.info.numOptions = numOptions + 1;
2603     }
2604     else
2605     {
2606         requestInfo.info.numOptions = numOptions;
2607         requestInfo.info.options =
2608             (CAHeaderOption_t*) OICCalloc(numOptions, sizeof(CAHeaderOption_t));
2609         memcpy(requestInfo.info.options, (CAHeaderOption_t*)options,
2610                numOptions * sizeof(CAHeaderOption_t));
2611     }
2612
2613     CopyDevAddrToEndpoint(devAddr, &endpoint);
2614
2615     if(payload)
2616     {
2617         if((result =
2618             OCConvertPayload(payload, &requestInfo.info.payload, &requestInfo.info.payloadSize))
2619                 != OC_STACK_OK)
2620         {
2621             OIC_LOG(ERROR, TAG, "Failed to create CBOR Payload");
2622             goto exit;
2623         }
2624         requestInfo.info.payloadFormat = CA_FORMAT_APPLICATION_CBOR;
2625     }
2626     else
2627     {
2628         requestInfo.info.payload = NULL;
2629         requestInfo.info.payloadSize = 0;
2630         requestInfo.info.payloadFormat = CA_FORMAT_UNDEFINED;
2631     }
2632
2633     if (result != OC_STACK_OK)
2634     {
2635         OIC_LOG(ERROR, TAG, "CACreateEndpoint error");
2636         goto exit;
2637     }
2638
2639     // prepare for response
2640 #ifdef WITH_PRESENCE
2641     if (method == OC_REST_PRESENCE)
2642     {
2643         char *presenceUri = NULL;
2644         result = OCPreparePresence(&endpoint, resourceUri, &presenceUri);
2645         if (OC_STACK_OK != result)
2646         {
2647             goto exit;
2648         }
2649
2650         // Assign full presence uri as coap://ip:port/oic/ad to add to callback list.
2651         // Presence notification will form a canonical uri to
2652         // look for callbacks into the application.
2653         resourceUri = presenceUri;
2654     }
2655 #endif
2656
2657     ttl = GetTicks(MAX_CB_TIMEOUT_SECONDS * MILLISECONDS_PER_SECOND);
2658     result = AddClientCB(&clientCB, cbData, token, tokenLength, &resHandle,
2659                             method, devAddr, resourceUri, resourceType, ttl);
2660     if (OC_STACK_OK != result)
2661     {
2662         goto exit;
2663     }
2664
2665     devAddr = NULL;       // Client CB list entry now owns it
2666     resourceUri = NULL;   // Client CB list entry now owns it
2667     resourceType = NULL;  // Client CB list entry now owns it
2668
2669     // send request
2670     result = OCSendRequest(&endpoint, &requestInfo);
2671     if (OC_STACK_OK != result)
2672     {
2673         goto exit;
2674     }
2675
2676     if (handle)
2677     {
2678         *handle = resHandle;
2679     }
2680
2681 exit:
2682     if (result != OC_STACK_OK)
2683     {
2684         OIC_LOG(ERROR, TAG, "OCDoResource error");
2685         FindAndDeleteClientCB(clientCB);
2686         CADestroyToken(token);
2687         if (handle)
2688         {
2689             *handle = NULL;
2690         }
2691         OICFree(resHandle);
2692     }
2693
2694     // This is the owner of the payload object, so we free it
2695     OCPayloadDestroy(payload);
2696     OICFree(requestInfo.info.payload);
2697     OICFree(devAddr);
2698     OICFree(resourceUri);
2699     OICFree(resourceType);
2700     OICFree(requestInfo.info.options);
2701     return result;
2702 }
2703
2704 OCStackResult OCCancel(OCDoHandle handle, OCQualityOfService qos, OCHeaderOption * options,
2705         uint8_t numOptions)
2706 {
2707     /*
2708      * This ftn is implemented one of two ways in the case of observation:
2709      *
2710      * 1. qos == OC_NON_CONFIRMABLE. When observe is unobserved..
2711      *      Remove the callback associated on client side.
2712      *      When the next notification comes in from server,
2713      *      reply with RESET message to server.
2714      *      Keep in mind that the server will react to RESET only
2715      *      if the last notification was sent as CON
2716      *
2717      * 2. qos == OC_CONFIRMABLE. When OCCancel is called,
2718      *      and it is associated with an observe request
2719      *      (i.e. ClientCB->method == OC_REST_OBSERVE || OC_REST_OBSERVE_ALL),
2720      *      Send CON Observe request to server with
2721      *      observe flag = OC_RESOURCE_OBSERVE_DEREGISTER.
2722      *      Remove the callback associated on client side.
2723      */
2724     OCStackResult ret = OC_STACK_OK;
2725     CAEndpoint_t endpoint = {.adapter = CA_DEFAULT_ADAPTER};
2726     CARequestInfo_t requestInfo = {.method = CA_GET};
2727
2728     if(!handle)
2729     {
2730         return OC_STACK_INVALID_PARAM;
2731     }
2732
2733     ClientCB *clientCB = GetClientCB(NULL, 0, handle, NULL);
2734     if (!clientCB)
2735     {
2736         OIC_LOG(ERROR, TAG, "Callback not found. Called OCCancel on same resource twice?");
2737         return OC_STACK_ERROR;
2738     }
2739
2740     switch (clientCB->method)
2741     {
2742         case OC_REST_OBSERVE:
2743         case OC_REST_OBSERVE_ALL:
2744
2745             OIC_LOG_V(INFO, TAG, "Canceling observation for resource %s", clientCB->requestUri);
2746
2747             CopyDevAddrToEndpoint(clientCB->devAddr, &endpoint);
2748
2749             if ((endpoint.adapter & CA_ADAPTER_IP) && qos != OC_HIGH_QOS)
2750             {
2751                 FindAndDeleteClientCB(clientCB);
2752                 break;
2753             }
2754
2755             OIC_LOG(INFO, TAG, "Cancelling observation as CONFIRMABLE");
2756
2757             requestInfo.info.type = qualityOfServiceToMessageType(qos);
2758             requestInfo.info.token = clientCB->token;
2759             requestInfo.info.tokenLength = clientCB->tokenLength;
2760
2761             if (CreateObserveHeaderOption (&(requestInfo.info.options),
2762                     options, numOptions, OC_OBSERVE_DEREGISTER) != OC_STACK_OK)
2763             {
2764                 return OC_STACK_ERROR;
2765             }
2766             requestInfo.info.numOptions = numOptions + 1;
2767             requestInfo.info.resourceUri = OICStrdup (clientCB->requestUri);
2768
2769
2770             ret = OCSendRequest(&endpoint, &requestInfo);
2771
2772             if (requestInfo.info.options)
2773             {
2774                 OICFree (requestInfo.info.options);
2775             }
2776             if (requestInfo.info.resourceUri)
2777             {
2778                 OICFree (requestInfo.info.resourceUri);
2779             }
2780
2781             break;
2782
2783         case OC_REST_DISCOVER:
2784             OIC_LOG_V(INFO, TAG, "Cancelling discovery callback for resource %s",
2785                                            clientCB->requestUri);
2786             FindAndDeleteClientCB(clientCB);
2787             break;
2788
2789 #ifdef WITH_PRESENCE
2790         case OC_REST_PRESENCE:
2791             FindAndDeleteClientCB(clientCB);
2792             break;
2793 #endif
2794
2795         default:
2796             ret = OC_STACK_INVALID_METHOD;
2797             break;
2798     }
2799
2800     return ret;
2801 }
2802
2803 /**
2804  * @brief   Register Persistent storage callback.
2805  * @param   persistentStorageHandler [IN] Pointers to open, read, write, close & unlink handlers.
2806  * @return
2807  *     OC_STACK_OK    - No errors; Success
2808  *     OC_STACK_INVALID_PARAM - Invalid parameter
2809  */
2810 OCStackResult OCRegisterPersistentStorageHandler(OCPersistentStorage* persistentStorageHandler)
2811 {
2812     OIC_LOG(INFO, TAG, "RegisterPersistentStorageHandler !!");
2813     if(!persistentStorageHandler)
2814     {
2815         OIC_LOG(ERROR, TAG, "The persistent storage handler is invalid");
2816         return OC_STACK_INVALID_PARAM;
2817     }
2818     else
2819     {
2820         if( !persistentStorageHandler->open ||
2821                 !persistentStorageHandler->close ||
2822                 !persistentStorageHandler->read ||
2823                 !persistentStorageHandler->unlink ||
2824                 !persistentStorageHandler->write)
2825         {
2826             OIC_LOG(ERROR, TAG, "The persistent storage handler is invalid");
2827             return OC_STACK_INVALID_PARAM;
2828         }
2829     }
2830     return SRMRegisterPersistentStorageHandler(persistentStorageHandler);
2831 }
2832
2833 #ifdef WITH_PRESENCE
2834
2835 OCStackResult OCProcessPresence()
2836 {
2837     OCStackResult result = OC_STACK_OK;
2838
2839     // the following line floods the log with messages that are irrelevant
2840     // to most purposes.  Uncomment as needed.
2841     //OIC_LOG(INFO, TAG, "Entering RequestPresence");
2842     ClientCB* cbNode = NULL;
2843     OCClientResponse clientResponse;
2844     OCStackApplicationResult cbResult = OC_STACK_DELETE_TRANSACTION;
2845
2846     LL_FOREACH(cbList, cbNode)
2847     {
2848         if (OC_REST_PRESENCE != cbNode->method || !cbNode->presence)
2849         {
2850             continue;
2851         }
2852
2853         uint32_t now = GetTicks(0);
2854         OIC_LOG_V(DEBUG, TAG, "this TTL level %d",
2855                                                 cbNode->presence->TTLlevel);
2856         OIC_LOG_V(DEBUG, TAG, "current ticks %d", now);
2857
2858         if (cbNode->presence->TTLlevel > PresenceTimeOutSize)
2859         {
2860             goto exit;
2861         }
2862
2863         if (cbNode->presence->TTLlevel < PresenceTimeOutSize)
2864         {
2865             OIC_LOG_V(DEBUG, TAG, "timeout ticks %d",
2866                     cbNode->presence->timeOut[cbNode->presence->TTLlevel]);
2867         }
2868         if (cbNode->presence->TTLlevel >= PresenceTimeOutSize)
2869         {
2870             OIC_LOG(DEBUG, TAG, "No more timeout ticks");
2871
2872             clientResponse.sequenceNumber = 0;
2873             clientResponse.result = OC_STACK_PRESENCE_TIMEOUT;
2874             clientResponse.devAddr = *cbNode->devAddr;
2875             FixUpClientResponse(&clientResponse);
2876             clientResponse.payload = NULL;
2877
2878             // Increment the TTLLevel (going to a next state), so we don't keep
2879             // sending presence notification to client.
2880             cbNode->presence->TTLlevel++;
2881             OIC_LOG_V(DEBUG, TAG, "moving to TTL level %d",
2882                                         cbNode->presence->TTLlevel);
2883
2884             cbResult = cbNode->callBack(cbNode->context, cbNode->handle, &clientResponse);
2885             if (cbResult == OC_STACK_DELETE_TRANSACTION)
2886             {
2887                 FindAndDeleteClientCB(cbNode);
2888             }
2889         }
2890
2891         if (now < cbNode->presence->timeOut[cbNode->presence->TTLlevel])
2892         {
2893             continue;
2894         }
2895
2896         CAEndpoint_t endpoint = {.adapter = CA_DEFAULT_ADAPTER};
2897         CAInfo_t requestData = {.type = CA_MSG_CONFIRM};
2898         CARequestInfo_t requestInfo = {.method = CA_GET};
2899
2900         OIC_LOG(DEBUG, TAG, "time to test server presence");
2901
2902         CopyDevAddrToEndpoint(cbNode->devAddr, &endpoint);
2903
2904         requestData.type = CA_MSG_NONCONFIRM;
2905         requestData.token = cbNode->token;
2906         requestData.tokenLength = cbNode->tokenLength;
2907         requestData.resourceUri = OC_RSRVD_PRESENCE_URI;
2908         requestInfo.method = CA_GET;
2909         requestInfo.info = requestData;
2910
2911         result = OCSendRequest(&endpoint, &requestInfo);
2912         if (OC_STACK_OK != result)
2913         {
2914             goto exit;
2915         }
2916
2917         cbNode->presence->TTLlevel++;
2918         OIC_LOG_V(DEBUG, TAG, "moving to TTL level %d", cbNode->presence->TTLlevel);
2919     }
2920 exit:
2921     if (result != OC_STACK_OK)
2922     {
2923         OIC_LOG(ERROR, TAG, "OCProcessPresence error");
2924     }
2925
2926     return result;
2927 }
2928 #endif // WITH_PRESENCE
2929
2930 OCStackResult OCProcess()
2931 {
2932 #ifdef WITH_PRESENCE
2933     OCProcessPresence();
2934 #endif
2935     CAHandleRequestResponse();
2936
2937 #ifdef ROUTING_GATEWAY
2938     RMProcess();
2939 #endif
2940
2941 #ifdef TCP_ADAPTER
2942     ProcessKeepAlive();
2943 #endif
2944     return OC_STACK_OK;
2945 }
2946
2947 #ifdef WITH_PRESENCE
2948 OCStackResult OCStartPresence(const uint32_t ttl)
2949 {
2950     uint8_t tokenLength = CA_MAX_TOKEN_LEN;
2951     OCChangeResourceProperty(
2952             &(((OCResource *)presenceResource.handle)->resourceProperties),
2953             OC_ACTIVE, 1);
2954
2955     if (OC_MAX_PRESENCE_TTL_SECONDS < ttl)
2956     {
2957         presenceResource.presenceTTL = OC_MAX_PRESENCE_TTL_SECONDS;
2958         OIC_LOG(INFO, TAG, "Setting Presence TTL to max value");
2959     }
2960     else if (0 == ttl)
2961     {
2962         presenceResource.presenceTTL = OC_DEFAULT_PRESENCE_TTL_SECONDS;
2963         OIC_LOG(INFO, TAG, "Setting Presence TTL to default value");
2964     }
2965     else
2966     {
2967         presenceResource.presenceTTL = ttl;
2968     }
2969     OIC_LOG_V(DEBUG, TAG, "Presence TTL is %" PRIu32 " seconds", presenceResource.presenceTTL);
2970
2971     if (OC_PRESENCE_UNINITIALIZED == presenceState)
2972     {
2973         presenceState = OC_PRESENCE_INITIALIZED;
2974
2975         OCDevAddr devAddr = { OC_DEFAULT_ADAPTER };
2976
2977         CAToken_t caToken = NULL;
2978         CAResult_t caResult = CAGenerateToken(&caToken, tokenLength);
2979         if (caResult != CA_STATUS_OK)
2980         {
2981             OIC_LOG(ERROR, TAG, "CAGenerateToken error");
2982             CADestroyToken(caToken);
2983             return OC_STACK_ERROR;
2984         }
2985
2986         AddObserver(OC_RSRVD_PRESENCE_URI, NULL, 0, caToken, tokenLength,
2987                 (OCResource *)presenceResource.handle, OC_LOW_QOS, OC_FORMAT_UNDEFINED, &devAddr);
2988         CADestroyToken(caToken);
2989     }
2990
2991     // Each time OCStartPresence is called
2992     // a different random 32-bit integer number is used
2993     ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
2994
2995     return SendPresenceNotification(((OCResource *)presenceResource.handle)->rsrcType,
2996             OC_PRESENCE_TRIGGER_CREATE);
2997 }
2998
2999 OCStackResult OCStopPresence()
3000 {
3001     OCStackResult result = OC_STACK_ERROR;
3002
3003     if(presenceResource.handle)
3004     {
3005         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3006
3007     // make resource inactive
3008     result = OCChangeResourceProperty(
3009             &(((OCResource *) presenceResource.handle)->resourceProperties),
3010             OC_ACTIVE, 0);
3011     }
3012
3013     if(result != OC_STACK_OK)
3014     {
3015         OIC_LOG(ERROR, TAG,
3016                       "Changing the presence resource properties to ACTIVE not successful");
3017         return result;
3018     }
3019
3020     return SendStopNotification();
3021 }
3022 #endif
3023
3024 OCStackResult OCSetDefaultDeviceEntityHandler(OCDeviceEntityHandler entityHandler,
3025                                             void* callbackParameter)
3026 {
3027     defaultDeviceHandler = entityHandler;
3028     defaultDeviceHandlerCallbackParameter = callbackParameter;
3029
3030     return OC_STACK_OK;
3031 }
3032
3033 OCStackResult OCSetPlatformInfo(OCPlatformInfo platformInfo)
3034 {
3035     OIC_LOG(INFO, TAG, "Entering OCSetPlatformInfo");
3036
3037     if(myStackMode ==  OC_SERVER || myStackMode == OC_CLIENT_SERVER || myStackMode == OC_GATEWAY)
3038     {
3039         if (validatePlatformInfo(platformInfo))
3040         {
3041             return SavePlatformInfo(platformInfo);
3042         }
3043         else
3044         {
3045             return OC_STACK_INVALID_PARAM;
3046         }
3047     }
3048     else
3049     {
3050         return OC_STACK_ERROR;
3051     }
3052 }
3053
3054 OCStackResult OCSetDeviceInfo(OCDeviceInfo deviceInfo)
3055 {
3056     OIC_LOG(INFO, TAG, "Entering OCSetDeviceInfo");
3057
3058     if (!deviceInfo.deviceName || deviceInfo.deviceName[0] == '\0')
3059     {
3060         OIC_LOG(ERROR, TAG, "Null or empty device name.");
3061         return OC_STACK_INVALID_PARAM;
3062     }
3063
3064     if (deviceInfo.types)
3065     {
3066         OCStringLL *type =  deviceInfo.types;
3067         OCResource *resource = findResource((OCResource *) deviceResource);
3068         if (!resource)
3069         {
3070             return OC_STACK_INVALID_PARAM;
3071         }
3072         deleteResourceType(resource->rsrcType);
3073         resource->rsrcType = NULL;
3074
3075         while (type)
3076         {
3077             OCBindResourceTypeToResource(deviceResource, type->value);
3078             type = type->next;
3079         }
3080     }
3081     return SaveDeviceInfo(deviceInfo);
3082 }
3083
3084 OCStackResult OCCreateResource(OCResourceHandle *handle,
3085         const char *resourceTypeName,
3086         const char *resourceInterfaceName,
3087         const char *uri, OCEntityHandler entityHandler,
3088         void* callbackParam,
3089         uint8_t resourceProperties)
3090 {
3091
3092     OCResource *pointer = NULL;
3093     OCStackResult result = OC_STACK_ERROR;
3094
3095     OIC_LOG(INFO, TAG, "Entering OCCreateResource");
3096
3097     if(myStackMode == OC_CLIENT)
3098     {
3099         return OC_STACK_INVALID_PARAM;
3100     }
3101     // Validate parameters
3102     if(!uri || uri[0]=='\0' || strlen(uri)>=MAX_URI_LENGTH )
3103     {
3104         OIC_LOG(ERROR, TAG, "URI is empty or too long");
3105         return OC_STACK_INVALID_URI;
3106     }
3107     // Is it presented during resource discovery?
3108     if (!handle || !resourceTypeName || resourceTypeName[0] == '\0' )
3109     {
3110         OIC_LOG(ERROR, TAG, "Input parameter is NULL");
3111         return OC_STACK_INVALID_PARAM;
3112     }
3113
3114     if(!resourceInterfaceName || strlen(resourceInterfaceName) == 0)
3115     {
3116         resourceInterfaceName = OC_RSRVD_INTERFACE_DEFAULT;
3117     }
3118
3119     // Make sure resourceProperties bitmask has allowed properties specified
3120     if (resourceProperties
3121             > (OC_ACTIVE | OC_DISCOVERABLE | OC_OBSERVABLE | OC_SLOW | OC_SECURE |
3122                OC_EXPLICIT_DISCOVERABLE))
3123     {
3124         OIC_LOG(ERROR, TAG, "Invalid property");
3125         return OC_STACK_INVALID_PARAM;
3126     }
3127
3128     // If the headResource is NULL, then no resources have been created...
3129     pointer = headResource;
3130     if (pointer)
3131     {
3132         // At least one resources is in the resource list, so we need to search for
3133         // repeated URLs, which are not allowed.  If a repeat is found, exit with an error
3134         while (pointer)
3135         {
3136             if (strncmp(uri, pointer->uri, MAX_URI_LENGTH) == 0)
3137             {
3138                 OIC_LOG_V(ERROR, TAG, "Resource %s already exists", uri);
3139                 return OC_STACK_INVALID_PARAM;
3140             }
3141             pointer = pointer->next;
3142         }
3143     }
3144     // Create the pointer and insert it into the resource list
3145     pointer = (OCResource *) OICCalloc(1, sizeof(OCResource));
3146     if (!pointer)
3147     {
3148         result = OC_STACK_NO_MEMORY;
3149         goto exit;
3150     }
3151     pointer->sequenceNum = OC_OFFSET_SEQUENCE_NUMBER;
3152
3153     insertResource(pointer);
3154
3155     // Set the uri
3156     pointer->uri = OICStrdup(uri);
3157     if (!pointer->uri)
3158     {
3159         result = OC_STACK_NO_MEMORY;
3160         goto exit;
3161     }
3162
3163     // Set properties.  Set OC_ACTIVE
3164     pointer->resourceProperties = (OCResourceProperty) (resourceProperties
3165             | OC_ACTIVE);
3166
3167     // Add the resourcetype to the resource
3168     result = BindResourceTypeToResource(pointer, resourceTypeName);
3169     if (result != OC_STACK_OK)
3170     {
3171         OIC_LOG(ERROR, TAG, "Error adding resourcetype");
3172         goto exit;
3173     }
3174
3175     // Add the resourceinterface to the resource
3176     result = BindResourceInterfaceToResource(pointer, resourceInterfaceName);
3177     if (result != OC_STACK_OK)
3178     {
3179         OIC_LOG(ERROR, TAG, "Error adding resourceinterface");
3180         goto exit;
3181     }
3182
3183     // If an entity handler has been passed, attach it to the newly created
3184     // resource.  Otherwise, set the default entity handler.
3185     if (entityHandler)
3186     {
3187         pointer->entityHandler = entityHandler;
3188         pointer->entityHandlerCallbackParam = callbackParam;
3189     }
3190     else
3191     {
3192         pointer->entityHandler = defaultResourceEHandler;
3193         pointer->entityHandlerCallbackParam = NULL;
3194     }
3195
3196     // Initialize a pointer indicating child resources in case of collection
3197     pointer->rsrcChildResourcesHead = NULL;
3198
3199     *handle = pointer;
3200     result = OC_STACK_OK;
3201
3202 #ifdef WITH_PRESENCE
3203     if (presenceResource.handle)
3204     {
3205         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3206         SendPresenceNotification(pointer->rsrcType, OC_PRESENCE_TRIGGER_CREATE);
3207     }
3208 #endif
3209 exit:
3210     if (result != OC_STACK_OK)
3211     {
3212         // Deep delete of resource and other dynamic elements that it contains
3213         deleteResource(pointer);
3214     }
3215     return result;
3216 }
3217
3218 OCStackResult OCBindResource(
3219         OCResourceHandle collectionHandle, OCResourceHandle resourceHandle)
3220 {
3221     OCResource *resource = NULL;
3222     OCChildResource *tempChildResource = NULL;
3223     OCChildResource *newChildResource = NULL;
3224
3225     OIC_LOG(INFO, TAG, "Entering OCBindResource");
3226
3227     // Validate parameters
3228     VERIFY_NON_NULL(collectionHandle, ERROR, OC_STACK_ERROR);
3229     VERIFY_NON_NULL(resourceHandle, ERROR, OC_STACK_ERROR);
3230     // Container cannot contain itself
3231     if (collectionHandle == resourceHandle)
3232     {
3233         OIC_LOG(ERROR, TAG, "Added handle equals collection handle");
3234         return OC_STACK_INVALID_PARAM;
3235     }
3236
3237     // Use the handle to find the resource in the resource linked list
3238     resource = findResource((OCResource *) collectionHandle);
3239     if (!resource)
3240     {
3241         OIC_LOG(ERROR, TAG, "Collection handle not found");
3242         return OC_STACK_INVALID_PARAM;
3243     }
3244
3245     // Look for an open slot to add add the child resource.
3246     // If found, add it and return success
3247
3248     tempChildResource = resource->rsrcChildResourcesHead;
3249
3250     while(resource->rsrcChildResourcesHead && tempChildResource->next)
3251     {
3252         // TODO: what if one of child resource was deregistered without unbinding?
3253         tempChildResource = tempChildResource->next;
3254     }
3255
3256     // Do memory allocation for child resource
3257     newChildResource = (OCChildResource *) OICCalloc(1, sizeof(OCChildResource));
3258     if(!newChildResource)
3259     {
3260         OIC_LOG(ERROR, TAG, "Adding new child resource is failed due to memory allocation failure");
3261         return OC_STACK_ERROR;
3262     }
3263
3264     newChildResource->rsrcResource = (OCResource *) resourceHandle;
3265     newChildResource->next = NULL;
3266
3267     if(!resource->rsrcChildResourcesHead)
3268     {
3269         resource->rsrcChildResourcesHead = newChildResource;
3270     }
3271     else {
3272         tempChildResource->next = newChildResource;
3273     }
3274
3275     OIC_LOG(INFO, TAG, "resource bound");
3276
3277 #ifdef WITH_PRESENCE
3278     if (presenceResource.handle)
3279     {
3280         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3281         SendPresenceNotification(((OCResource *) resourceHandle)->rsrcType,
3282                 OC_PRESENCE_TRIGGER_CHANGE);
3283     }
3284 #endif
3285
3286     return OC_STACK_OK;
3287 }
3288
3289 OCStackResult OCUnBindResource(
3290         OCResourceHandle collectionHandle, OCResourceHandle resourceHandle)
3291 {
3292     OCResource *resource = NULL;
3293     OCChildResource *tempChildResource = NULL;
3294     OCChildResource *tempLastChildResource = NULL;
3295
3296     OIC_LOG(INFO, TAG, "Entering OCUnBindResource");
3297
3298     // Validate parameters
3299     VERIFY_NON_NULL(collectionHandle, ERROR, OC_STACK_ERROR);
3300     VERIFY_NON_NULL(resourceHandle, ERROR, OC_STACK_ERROR);
3301     // Container cannot contain itself
3302     if (collectionHandle == resourceHandle)
3303     {
3304         OIC_LOG(ERROR, TAG, "removing handle equals collection handle");
3305         return OC_STACK_INVALID_PARAM;
3306     }
3307
3308     // Use the handle to find the resource in the resource linked list
3309     resource = findResource((OCResource *) collectionHandle);
3310     if (!resource)
3311     {
3312         OIC_LOG(ERROR, TAG, "Collection handle not found");
3313         return OC_STACK_INVALID_PARAM;
3314     }
3315
3316     // Look for an open slot to add add the child resource.
3317     // If found, add it and return success
3318     if(!resource->rsrcChildResourcesHead)
3319     {
3320         OIC_LOG(INFO, TAG, "resource not found in collection");
3321
3322         // Unable to add resourceHandle, so return error
3323         return OC_STACK_ERROR;
3324
3325     }
3326
3327     tempChildResource = resource->rsrcChildResourcesHead;
3328
3329     while (tempChildResource)
3330     {
3331         if(tempChildResource->rsrcResource == resourceHandle)
3332         {
3333             // if resource going to be unbinded is the head one.
3334             if( tempChildResource == resource->rsrcChildResourcesHead )
3335             {
3336                 OCChildResource *temp = resource->rsrcChildResourcesHead->next;
3337                 OICFree(resource->rsrcChildResourcesHead);
3338                 resource->rsrcChildResourcesHead = temp;
3339                 temp = NULL;
3340             }
3341             else
3342             {
3343                 OCChildResource *temp = tempChildResource->next;
3344                 OICFree(tempChildResource);
3345                 tempLastChildResource->next = temp;
3346                 temp = NULL;
3347             }
3348
3349             OIC_LOG(INFO, TAG, "resource unbound");
3350
3351             // Send notification when resource is unbounded successfully.
3352 #ifdef WITH_PRESENCE
3353             if (presenceResource.handle)
3354             {
3355                 ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3356                 SendPresenceNotification(((OCResource *) resourceHandle)->rsrcType,
3357                         OC_PRESENCE_TRIGGER_CHANGE);
3358             }
3359 #endif
3360             tempChildResource = NULL;
3361             tempLastChildResource = NULL;
3362
3363             return OC_STACK_OK;
3364
3365         }
3366
3367         tempLastChildResource = tempChildResource;
3368         tempChildResource = tempChildResource->next;
3369     }
3370
3371     OIC_LOG(INFO, TAG, "resource not found in collection");
3372
3373     tempChildResource = NULL;
3374     tempLastChildResource = NULL;
3375
3376     // Unable to add resourceHandle, so return error
3377     return OC_STACK_ERROR;
3378 }
3379
3380 // Precondition is that the parameter has been checked to not equal NULL.
3381 static bool ValidateResourceTypeInterface(const char *resourceItemName)
3382 {
3383     if (resourceItemName[0] < 'a' || resourceItemName[0] > 'z')
3384     {
3385         return false;
3386     }
3387
3388     size_t index = 1;
3389     while (resourceItemName[index] != '\0')
3390     {
3391         if (resourceItemName[index] != '.' &&
3392                 resourceItemName[index] != '-' &&
3393                 (resourceItemName[index] < 'a' || resourceItemName[index] > 'z') &&
3394                 (resourceItemName[index] < '0' || resourceItemName[index] > '9'))
3395         {
3396             return false;
3397         }
3398         ++index;
3399     }
3400
3401     return true;
3402 }
3403 OCStackResult BindResourceTypeToResource(OCResource* resource,
3404                                             const char *resourceTypeName)
3405 {
3406     OCResourceType *pointer = NULL;
3407     char *str = NULL;
3408     OCStackResult result = OC_STACK_ERROR;
3409
3410     VERIFY_NON_NULL(resourceTypeName, ERROR, OC_STACK_INVALID_PARAM);
3411
3412     if (!ValidateResourceTypeInterface(resourceTypeName))
3413     {
3414         OIC_LOG(ERROR, TAG, "resource type illegal (see RFC 6690)");
3415         return OC_STACK_INVALID_PARAM;
3416     }
3417
3418     pointer = (OCResourceType *) OICCalloc(1, sizeof(OCResourceType));
3419     if (!pointer)
3420     {
3421         result = OC_STACK_NO_MEMORY;
3422         goto exit;
3423     }
3424
3425     str = OICStrdup(resourceTypeName);
3426     if (!str)
3427     {
3428         result = OC_STACK_NO_MEMORY;
3429         goto exit;
3430     }
3431     pointer->resourcetypename = str;
3432     pointer->next = NULL;
3433
3434     insertResourceType(resource, pointer);
3435     result = OC_STACK_OK;
3436
3437 exit:
3438     if (result != OC_STACK_OK)
3439     {
3440         OICFree(pointer);
3441         OICFree(str);
3442     }
3443
3444     return result;
3445 }
3446
3447 OCStackResult BindResourceInterfaceToResource(OCResource* resource,
3448         const char *resourceInterfaceName)
3449 {
3450     OCResourceInterface *pointer = NULL;
3451     char *str = NULL;
3452     OCStackResult result = OC_STACK_ERROR;
3453
3454     VERIFY_NON_NULL(resourceInterfaceName, ERROR, OC_STACK_INVALID_PARAM);
3455
3456     if (!ValidateResourceTypeInterface(resourceInterfaceName))
3457     {
3458         OIC_LOG(ERROR, TAG, "resource /interface illegal (see RFC 6690)");
3459         return OC_STACK_INVALID_PARAM;
3460     }
3461
3462     OIC_LOG_V(INFO, TAG, "Binding %s interface to %s", resourceInterfaceName, resource->uri);
3463
3464     pointer = (OCResourceInterface *) OICCalloc(1, sizeof(OCResourceInterface));
3465     if (!pointer)
3466     {
3467         result = OC_STACK_NO_MEMORY;
3468         goto exit;
3469     }
3470
3471     str = OICStrdup(resourceInterfaceName);
3472     if (!str)
3473     {
3474         result = OC_STACK_NO_MEMORY;
3475         goto exit;
3476     }
3477     pointer->name = str;
3478
3479     // Bind the resourceinterface to the resource
3480     insertResourceInterface(resource, pointer);
3481
3482     result = OC_STACK_OK;
3483
3484     exit:
3485     if (result != OC_STACK_OK)
3486     {
3487         OICFree(pointer);
3488         OICFree(str);
3489     }
3490
3491     return result;
3492 }
3493
3494 OCStackResult OCBindResourceTypeToResource(OCResourceHandle handle,
3495         const char *resourceTypeName)
3496 {
3497
3498     OCStackResult result = OC_STACK_ERROR;
3499     OCResource *resource = NULL;
3500
3501     resource = findResource((OCResource *) handle);
3502     if (!resource)
3503     {
3504         OIC_LOG(ERROR, TAG, "Resource not found");
3505         return OC_STACK_ERROR;
3506     }
3507
3508     result = BindResourceTypeToResource(resource, resourceTypeName);
3509
3510 #ifdef WITH_PRESENCE
3511     if(presenceResource.handle)
3512     {
3513         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3514         SendPresenceNotification(resource->rsrcType, OC_PRESENCE_TRIGGER_CHANGE);
3515     }
3516 #endif
3517
3518     return result;
3519 }
3520
3521 OCStackResult OCBindResourceInterfaceToResource(OCResourceHandle handle,
3522         const char *resourceInterfaceName)
3523 {
3524
3525     OCStackResult result = OC_STACK_ERROR;
3526     OCResource *resource = NULL;
3527
3528     resource = findResource((OCResource *) handle);
3529     if (!resource)
3530     {
3531         OIC_LOG(ERROR, TAG, "Resource not found");
3532         return OC_STACK_ERROR;
3533     }
3534
3535     result = BindResourceInterfaceToResource(resource, resourceInterfaceName);
3536
3537 #ifdef WITH_PRESENCE
3538     if (presenceResource.handle)
3539     {
3540         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3541         SendPresenceNotification(resource->rsrcType, OC_PRESENCE_TRIGGER_CHANGE);
3542     }
3543 #endif
3544
3545     return result;
3546 }
3547
3548 OCStackResult OCGetNumberOfResources(uint8_t *numResources)
3549 {
3550     OCResource *pointer = headResource;
3551
3552     VERIFY_NON_NULL(numResources, ERROR, OC_STACK_INVALID_PARAM);
3553     *numResources = 0;
3554     while (pointer)
3555     {
3556         *numResources = *numResources + 1;
3557         pointer = pointer->next;
3558     }
3559     return OC_STACK_OK;
3560 }
3561
3562 OCResourceHandle OCGetResourceHandle(uint8_t index)
3563 {
3564     OCResource *pointer = headResource;
3565
3566     for( uint8_t i = 0; i < index && pointer; ++i)
3567     {
3568         pointer = pointer->next;
3569     }
3570     return (OCResourceHandle) pointer;
3571 }
3572
3573 OCStackResult OCDeleteResource(OCResourceHandle handle)
3574 {
3575     if (!handle)
3576     {
3577         OIC_LOG(ERROR, TAG, "Invalid handle for deletion");
3578         return OC_STACK_INVALID_PARAM;
3579     }
3580
3581     OCResource *resource = findResource((OCResource *) handle);
3582     if (resource == NULL)
3583     {
3584         OIC_LOG(ERROR, TAG, "Resource not found");
3585         return OC_STACK_NO_RESOURCE;
3586     }
3587
3588     if (deleteResource((OCResource *) handle) != OC_STACK_OK)
3589     {
3590         OIC_LOG(ERROR, TAG, "Error deleting resource");
3591         return OC_STACK_ERROR;
3592     }
3593
3594     return OC_STACK_OK;
3595 }
3596
3597 const char *OCGetResourceUri(OCResourceHandle handle)
3598 {
3599     OCResource *resource = NULL;
3600
3601     resource = findResource((OCResource *) handle);
3602     if (resource)
3603     {
3604         return resource->uri;
3605     }
3606     return (const char *) NULL;
3607 }
3608
3609 OCResourceProperty OCGetResourceProperties(OCResourceHandle handle)
3610 {
3611     OCResource *resource = NULL;
3612
3613     resource = findResource((OCResource *) handle);
3614     if (resource)
3615     {
3616         return resource->resourceProperties;
3617     }
3618     return (OCResourceProperty)-1;
3619 }
3620
3621 OCStackResult OCGetNumberOfResourceTypes(OCResourceHandle handle,
3622         uint8_t *numResourceTypes)
3623 {
3624     OCResource *resource = NULL;
3625     OCResourceType *pointer = NULL;
3626
3627     VERIFY_NON_NULL(numResourceTypes, ERROR, OC_STACK_INVALID_PARAM);
3628     VERIFY_NON_NULL(handle, ERROR, OC_STACK_INVALID_PARAM);
3629
3630     *numResourceTypes = 0;
3631
3632     resource = findResource((OCResource *) handle);
3633     if (resource)
3634     {
3635         pointer = resource->rsrcType;
3636         while (pointer)
3637         {
3638             *numResourceTypes = *numResourceTypes + 1;
3639             pointer = pointer->next;
3640         }
3641     }
3642     return OC_STACK_OK;
3643 }
3644
3645 const char *OCGetResourceTypeName(OCResourceHandle handle, uint8_t index)
3646 {
3647     OCResourceType *resourceType = NULL;
3648
3649     resourceType = findResourceTypeAtIndex(handle, index);
3650     if (resourceType)
3651     {
3652         return resourceType->resourcetypename;
3653     }
3654     return (const char *) NULL;
3655 }
3656
3657 OCStackResult OCGetNumberOfResourceInterfaces(OCResourceHandle handle,
3658         uint8_t *numResourceInterfaces)
3659 {
3660     OCResourceInterface *pointer = NULL;
3661     OCResource *resource = NULL;
3662
3663     VERIFY_NON_NULL(handle, ERROR, OC_STACK_INVALID_PARAM);
3664     VERIFY_NON_NULL(numResourceInterfaces, ERROR, OC_STACK_INVALID_PARAM);
3665
3666     *numResourceInterfaces = 0;
3667     resource = findResource((OCResource *) handle);
3668     if (resource)
3669     {
3670         pointer = resource->rsrcInterface;
3671         while (pointer)
3672         {
3673             *numResourceInterfaces = *numResourceInterfaces + 1;
3674             pointer = pointer->next;
3675         }
3676     }
3677     return OC_STACK_OK;
3678 }
3679
3680 const char *OCGetResourceInterfaceName(OCResourceHandle handle, uint8_t index)
3681 {
3682     OCResourceInterface *resourceInterface = NULL;
3683
3684     resourceInterface = findResourceInterfaceAtIndex(handle, index);
3685     if (resourceInterface)
3686     {
3687         return resourceInterface->name;
3688     }
3689     return (const char *) NULL;
3690 }
3691
3692 OCResourceHandle OCGetResourceHandleFromCollection(OCResourceHandle collectionHandle,
3693         uint8_t index)
3694 {
3695     OCResource *resource = NULL;
3696     OCChildResource *tempChildResource = NULL;
3697     uint8_t num = 0;
3698
3699     resource = findResource((OCResource *) collectionHandle);
3700     if (!resource)
3701     {
3702         return NULL;
3703     }
3704
3705     tempChildResource = resource->rsrcChildResourcesHead;
3706
3707     while(tempChildResource)
3708     {
3709         if( num == index )
3710         {
3711             return tempChildResource->rsrcResource;
3712         }
3713         num++;
3714         tempChildResource = tempChildResource->next;
3715     }
3716
3717     // In this case, the number of resource handles in the collection exceeds the index
3718     tempChildResource = NULL;
3719     return NULL;
3720 }
3721
3722 OCStackResult OCBindResourceHandler(OCResourceHandle handle,
3723         OCEntityHandler entityHandler,
3724         void* callbackParam)
3725 {
3726     OCResource *resource = NULL;
3727
3728     // Validate parameters
3729     VERIFY_NON_NULL(handle, ERROR, OC_STACK_INVALID_PARAM);
3730
3731     // Use the handle to find the resource in the resource linked list
3732     resource = findResource((OCResource *)handle);
3733     if (!resource)
3734     {
3735         OIC_LOG(ERROR, TAG, "Resource not found");
3736         return OC_STACK_ERROR;
3737     }
3738
3739     // Bind the handler
3740     resource->entityHandler = entityHandler;
3741     resource->entityHandlerCallbackParam = callbackParam;
3742
3743 #ifdef WITH_PRESENCE
3744     if (presenceResource.handle)
3745     {
3746         ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
3747         SendPresenceNotification(resource->rsrcType, OC_PRESENCE_TRIGGER_CHANGE);
3748     }
3749 #endif
3750
3751     return OC_STACK_OK;
3752 }
3753
3754 OCEntityHandler OCGetResourceHandler(OCResourceHandle handle)
3755 {
3756     OCResource *resource = NULL;
3757
3758     resource = findResource((OCResource *)handle);
3759     if (!resource)
3760     {
3761         OIC_LOG(ERROR, TAG, "Resource not found");
3762         return NULL;
3763     }
3764
3765     // Bind the handler
3766     return resource->entityHandler;
3767 }
3768
3769 void incrementSequenceNumber(OCResource * resPtr)
3770 {
3771     // Increment the sequence number
3772     resPtr->sequenceNum += 1;
3773     if (resPtr->sequenceNum == MAX_SEQUENCE_NUMBER)
3774     {
3775         resPtr->sequenceNum = OC_OFFSET_SEQUENCE_NUMBER+1;
3776     }
3777     return;
3778 }
3779
3780 #ifdef WITH_PRESENCE
3781 OCStackResult SendPresenceNotification(OCResourceType *resourceType,
3782         OCPresenceTrigger trigger)
3783 {
3784     OCResource *resPtr = NULL;
3785     OCStackResult result = OC_STACK_ERROR;
3786     OCMethod method = OC_REST_PRESENCE;
3787     uint32_t maxAge = 0;
3788     resPtr = findResource((OCResource *) presenceResource.handle);
3789     if(NULL == resPtr)
3790     {
3791         return OC_STACK_NO_RESOURCE;
3792     }
3793
3794     if((((OCResource *) presenceResource.handle)->resourceProperties) & OC_ACTIVE)
3795     {
3796         maxAge = presenceResource.presenceTTL;
3797
3798         result = SendAllObserverNotification(method, resPtr, maxAge,
3799                 trigger, resourceType, OC_LOW_QOS);
3800     }
3801
3802     return result;
3803 }
3804
3805 OCStackResult SendStopNotification()
3806 {
3807     OCResource *resPtr = NULL;
3808     OCStackResult result = OC_STACK_ERROR;
3809     OCMethod method = OC_REST_PRESENCE;
3810     resPtr = findResource((OCResource *) presenceResource.handle);
3811     if(NULL == resPtr)
3812     {
3813         return OC_STACK_NO_RESOURCE;
3814     }
3815
3816     // maxAge is 0. ResourceType is NULL.
3817     result = SendAllObserverNotification(method, resPtr, 0, OC_PRESENCE_TRIGGER_DELETE,
3818             NULL, OC_LOW_QOS);
3819
3820     return result;
3821 }
3822
3823 #endif // WITH_PRESENCE
3824 OCStackResult OCNotifyAllObservers(OCResourceHandle handle, OCQualityOfService qos)
3825 {
3826     OCResource *resPtr = NULL;
3827     OCStackResult result = OC_STACK_ERROR;
3828     OCMethod method = OC_REST_NOMETHOD;
3829     uint32_t maxAge = 0;
3830
3831     OIC_LOG(INFO, TAG, "Notifying all observers");
3832 #ifdef WITH_PRESENCE
3833     if(handle == presenceResource.handle)
3834     {
3835         return OC_STACK_OK;
3836     }
3837 #endif // WITH_PRESENCE
3838     VERIFY_NON_NULL(handle, ERROR, OC_STACK_ERROR);
3839
3840     // Verify that the resource exists
3841     resPtr = findResource ((OCResource *) handle);
3842     if (NULL == resPtr)
3843     {
3844         return OC_STACK_NO_RESOURCE;
3845     }
3846     else
3847     {
3848         //only increment in the case of regular observing (not presence)
3849         incrementSequenceNumber(resPtr);
3850         method = OC_REST_OBSERVE;
3851         maxAge = MAX_OBSERVE_AGE;
3852 #ifdef WITH_PRESENCE
3853         result = SendAllObserverNotification (method, resPtr, maxAge,
3854                 OC_PRESENCE_TRIGGER_DELETE, NULL, qos);
3855 #else
3856         result = SendAllObserverNotification (method, resPtr, maxAge, qos);
3857 #endif
3858         return result;
3859     }
3860 }
3861
3862 OCStackResult
3863 OCNotifyListOfObservers (OCResourceHandle handle,
3864                          OCObservationId  *obsIdList,
3865                          uint8_t          numberOfIds,
3866                          const OCRepPayload       *payload,
3867                          OCQualityOfService qos)
3868 {
3869     OIC_LOG(INFO, TAG, "Entering OCNotifyListOfObservers");
3870
3871     OCResource *resPtr = NULL;
3872     //TODO: we should allow the server to define this
3873     uint32_t maxAge = MAX_OBSERVE_AGE;
3874
3875     VERIFY_NON_NULL(handle, ERROR, OC_STACK_ERROR);
3876     VERIFY_NON_NULL(obsIdList, ERROR, OC_STACK_ERROR);
3877     VERIFY_NON_NULL(payload, ERROR, OC_STACK_ERROR);
3878
3879     resPtr = findResource ((OCResource *) handle);
3880     if (NULL == resPtr || myStackMode == OC_CLIENT)
3881     {
3882         return OC_STACK_NO_RESOURCE;
3883     }
3884     else
3885     {
3886         incrementSequenceNumber(resPtr);
3887     }
3888     return (SendListObserverNotification(resPtr, obsIdList, numberOfIds,
3889             payload, maxAge, qos));
3890 }
3891
3892 OCStackResult OCDoResponse(OCEntityHandlerResponse *ehResponse)
3893 {
3894     OCStackResult result = OC_STACK_ERROR;
3895     OCServerRequest *serverRequest = NULL;
3896
3897     OIC_LOG(INFO, TAG, "Entering OCDoResponse");
3898
3899     // Validate input parameters
3900     VERIFY_NON_NULL(ehResponse, ERROR, OC_STACK_INVALID_PARAM);
3901     VERIFY_NON_NULL(ehResponse->requestHandle, ERROR, OC_STACK_INVALID_PARAM);
3902
3903     // Normal response
3904     // Get pointer to request info
3905     serverRequest = GetServerRequestUsingHandle((OCServerRequest *)ehResponse->requestHandle);
3906     if(serverRequest)
3907     {
3908         // response handler in ocserverrequest.c. Usually HandleSingleResponse.
3909         result = serverRequest->ehResponseHandler(ehResponse);
3910     }
3911
3912     return result;
3913 }
3914
3915 //#ifdef DIRECT_PAIRING
3916 const OCDPDev_t* OCDiscoverDirectPairingDevices(unsigned short waittime)
3917 {
3918     OIC_LOG(INFO, TAG, "Start OCDiscoverDirectPairingDevices");
3919     if(OC_STACK_OK != DPDeviceDiscovery(waittime))
3920     {
3921         OIC_LOG(ERROR, TAG, "Fail to discover Direct-Pairing device");
3922         return NULL;
3923     }
3924
3925     return (const OCDPDev_t*)DPGetDiscoveredDevices();
3926 }
3927
3928 const OCDPDev_t* OCGetDirectPairedDevices()
3929 {
3930     return (const OCDPDev_t*)DPGetPairedDevices();
3931 }
3932
3933 void DirectPairingCB (OCDirectPairingDev_t * peer, OCStackResult result)
3934 {
3935     if (gDirectpairingCallback)
3936     {
3937         gDirectpairingCallback((OCDPDev_t*)peer, result);
3938         gDirectpairingCallback = NULL;
3939     }
3940 }
3941
3942 OCStackResult OCDoDirectPairing(OCDPDev_t* peer, OCPrm_t pmSel, char *pinNumber,
3943                                                      OCDirectPairingCB resultCallback)
3944 {
3945     OIC_LOG(INFO, TAG, "Start OCDoDirectPairing");
3946     if(NULL ==  peer)
3947     {
3948         OIC_LOG(ERROR, TAG, "Invalid parameters");
3949         return OC_STACK_INVALID_PARAM;
3950     }
3951
3952     if(NULL == resultCallback)
3953     {
3954         OIC_LOG(ERROR, TAG, "Invalid parameters");
3955         return OC_STACK_INVALID_CALLBACK;
3956     }
3957     gDirectpairingCallback = resultCallback;
3958     return DPDirectPairing((OCDirectPairingDev_t*)peer, (OicSecPrm_t)pmSel,
3959                                            pinNumber, DirectPairingCB);
3960 }
3961 //#endif // DIRECT_PAIRING
3962
3963 //-----------------------------------------------------------------------------
3964 // Private internal function definitions
3965 //-----------------------------------------------------------------------------
3966 static OCDoHandle GenerateInvocationHandle()
3967 {
3968     OCDoHandle handle = NULL;
3969     // Generate token here, it will be deleted when the transaction is deleted
3970     handle = (OCDoHandle) OICMalloc(sizeof(uint8_t[CA_MAX_TOKEN_LEN]));
3971     if (handle)
3972     {
3973         OCFillRandomMem((uint8_t*)handle, sizeof(uint8_t[CA_MAX_TOKEN_LEN]));
3974     }
3975
3976     return handle;
3977 }
3978
3979 #ifdef WITH_PRESENCE
3980 OCStackResult OCChangeResourceProperty(OCResourceProperty * inputProperty,
3981         OCResourceProperty resourceProperties, uint8_t enable)
3982 {
3983     if (!inputProperty)
3984     {
3985         return OC_STACK_INVALID_PARAM;
3986     }
3987     if (resourceProperties
3988             > (OC_ACTIVE | OC_DISCOVERABLE | OC_OBSERVABLE | OC_SLOW))
3989     {
3990         OIC_LOG(ERROR, TAG, "Invalid property");
3991         return OC_STACK_INVALID_PARAM;
3992     }
3993     if(!enable)
3994     {
3995         *inputProperty = (OCResourceProperty) (*inputProperty & ~(resourceProperties));
3996     }
3997     else
3998     {
3999         *inputProperty = (OCResourceProperty) (*inputProperty | resourceProperties);
4000     }
4001     return OC_STACK_OK;
4002 }
4003 #endif
4004
4005 OCStackResult initResources()
4006 {
4007     OCStackResult result = OC_STACK_OK;
4008
4009     headResource = NULL;
4010     tailResource = NULL;
4011     // Init Virtual Resources
4012 #ifdef WITH_PRESENCE
4013     presenceResource.presenceTTL = OC_DEFAULT_PRESENCE_TTL_SECONDS;
4014
4015     result = OCCreateResource(&presenceResource.handle,
4016             OC_RSRVD_RESOURCE_TYPE_PRESENCE,
4017             "core.r",
4018             OC_RSRVD_PRESENCE_URI,
4019             NULL,
4020             NULL,
4021             OC_OBSERVABLE);
4022     //make resource inactive
4023     result = OCChangeResourceProperty(
4024             &(((OCResource *) presenceResource.handle)->resourceProperties),
4025             OC_ACTIVE, 0);
4026 #endif
4027 #ifndef WITH_ARDUINO
4028     if (result == OC_STACK_OK)
4029     {
4030         result = SRMInitSecureResources();
4031     }
4032 #endif
4033
4034     if(result == OC_STACK_OK)
4035     {
4036         result = OCCreateResource(&deviceResource,
4037                                   OC_RSRVD_RESOURCE_TYPE_DEVICE,
4038                                   OC_RSRVD_INTERFACE_DEFAULT,
4039                                   OC_RSRVD_DEVICE_URI,
4040                                   NULL,
4041                                   NULL,
4042                                   OC_DISCOVERABLE);
4043         if(result == OC_STACK_OK)
4044         {
4045             result = BindResourceInterfaceToResource((OCResource *)deviceResource,
4046                                                      OC_RSRVD_INTERFACE_READ);
4047         }
4048     }
4049
4050     if(result == OC_STACK_OK)
4051     {
4052         result = OCCreateResource(&platformResource,
4053                                   OC_RSRVD_RESOURCE_TYPE_PLATFORM,
4054                                   OC_RSRVD_INTERFACE_DEFAULT,
4055                                   OC_RSRVD_PLATFORM_URI,
4056                                   NULL,
4057                                   NULL,
4058                                   OC_DISCOVERABLE);
4059         if(result == OC_STACK_OK)
4060         {
4061             result = BindResourceInterfaceToResource((OCResource *)platformResource,
4062                                                      OC_RSRVD_INTERFACE_READ);
4063         }
4064     }
4065
4066     return result;
4067 }
4068
4069 void insertResource(OCResource *resource)
4070 {
4071     if (!headResource)
4072     {
4073         headResource = resource;
4074         tailResource = resource;
4075     }
4076     else
4077     {
4078         tailResource->next = resource;
4079         tailResource = resource;
4080     }
4081     resource->next = NULL;
4082 }
4083
4084 OCResource *findResource(OCResource *resource)
4085 {
4086     OCResource *pointer = headResource;
4087
4088     while (pointer)
4089     {
4090         if (pointer == resource)
4091         {
4092             return resource;
4093         }
4094         pointer = pointer->next;
4095     }
4096     return NULL;
4097 }
4098
4099 void deleteAllResources()
4100 {
4101     OCResource *pointer = headResource;
4102     OCResource *temp = NULL;
4103
4104     while (pointer)
4105     {
4106         temp = pointer->next;
4107 #ifdef WITH_PRESENCE
4108         if (pointer != (OCResource *) presenceResource.handle)
4109         {
4110 #endif // WITH_PRESENCE
4111             deleteResource(pointer);
4112 #ifdef WITH_PRESENCE
4113         }
4114 #endif // WITH_PRESENCE
4115         pointer = temp;
4116     }
4117
4118     SRMDeInitSecureResources();
4119
4120 #ifdef WITH_PRESENCE
4121     // Ensure that the last resource to be deleted is the presence resource. This allows for all
4122     // presence notification attributed to their deletion to be processed.
4123     deleteResource((OCResource *) presenceResource.handle);
4124 #endif // WITH_PRESENCE
4125 }
4126
4127 OCStackResult deleteResource(OCResource *resource)
4128 {
4129     OCResource *prev = NULL;
4130     OCResource *temp = NULL;
4131     if(!resource)
4132     {
4133         OIC_LOG(DEBUG,TAG,"resource is NULL");
4134         return OC_STACK_INVALID_PARAM;
4135     }
4136
4137     OIC_LOG_V (INFO, TAG, "Deleting resource %s", resource->uri);
4138
4139     temp = headResource;
4140     while (temp)
4141     {
4142         if (temp == resource)
4143         {
4144             // Invalidate all Resource Properties.
4145             resource->resourceProperties = (OCResourceProperty) 0;
4146 #ifdef WITH_PRESENCE
4147             if(resource != (OCResource *) presenceResource.handle)
4148             {
4149 #endif // WITH_PRESENCE
4150                 OCNotifyAllObservers((OCResourceHandle)resource, OC_HIGH_QOS);
4151 #ifdef WITH_PRESENCE
4152             }
4153
4154             if(presenceResource.handle)
4155             {
4156                 ((OCResource *)presenceResource.handle)->sequenceNum = OCGetRandom();
4157                 SendPresenceNotification(resource->rsrcType, OC_PRESENCE_TRIGGER_DELETE);
4158             }
4159 #endif
4160             // Only resource in list.
4161             if (temp == headResource && temp == tailResource)
4162             {
4163                 headResource = NULL;
4164                 tailResource = NULL;
4165             }
4166             // Deleting head.
4167             else if (temp == headResource)
4168             {
4169                 headResource = temp->next;
4170             }
4171             // Deleting tail.
4172             else if (temp == tailResource)
4173             {
4174                 tailResource = prev;
4175                 tailResource->next = NULL;
4176             }
4177             else
4178             {
4179                 prev->next = temp->next;
4180             }
4181
4182             deleteResourceElements(temp);
4183             OICFree(temp);
4184             return OC_STACK_OK;
4185         }
4186         else
4187         {
4188             prev = temp;
4189             temp = temp->next;
4190         }
4191     }
4192
4193     return OC_STACK_ERROR;
4194 }
4195
4196 void deleteResourceElements(OCResource *resource)
4197 {
4198     if (!resource)
4199     {
4200         return;
4201     }
4202
4203     OICFree(resource->uri);
4204     deleteResourceType(resource->rsrcType);
4205     deleteResourceInterface(resource->rsrcInterface);
4206 }
4207
4208 void deleteResourceType(OCResourceType *resourceType)
4209 {
4210     OCResourceType *pointer = resourceType;
4211     OCResourceType *next = NULL;
4212
4213     while (pointer)
4214     {
4215         next = pointer->next;
4216         OICFree(pointer->resourcetypename);
4217         OICFree(pointer);
4218         pointer = next;
4219     }
4220 }
4221
4222 void deleteResourceInterface(OCResourceInterface *resourceInterface)
4223 {
4224     OCResourceInterface *pointer = resourceInterface;
4225     OCResourceInterface *next = NULL;
4226
4227     while (pointer)
4228     {
4229         next = pointer->next;
4230         OICFree(pointer->name);
4231         OICFree(pointer);
4232         pointer = next;
4233     }
4234 }
4235
4236 void insertResourceType(OCResource *resource, OCResourceType *resourceType)
4237 {
4238     OCResourceType *pointer = NULL;
4239     OCResourceType *previous = NULL;
4240     if (!resource || !resourceType)
4241     {
4242         return;
4243     }
4244     // resource type list is empty.
4245     else if (!resource->rsrcType)
4246     {
4247         resource->rsrcType = resourceType;
4248     }
4249     else
4250     {
4251         pointer = resource->rsrcType;
4252
4253         while (pointer)
4254         {
4255             if (!strcmp(resourceType->resourcetypename, pointer->resourcetypename))
4256             {
4257                 OIC_LOG_V(INFO, TAG, "Type %s already exists", resourceType->resourcetypename);
4258                 OICFree(resourceType->resourcetypename);
4259                 OICFree(resourceType);
4260                 return;
4261             }
4262             previous = pointer;
4263             pointer = pointer->next;
4264         }
4265
4266         if (previous)
4267         {
4268             previous->next = resourceType;
4269         }
4270     }
4271     resourceType->next = NULL;
4272
4273     OIC_LOG_V(INFO, TAG, "Added type %s to %s", resourceType->resourcetypename, resource->uri);
4274 }
4275
4276 OCResourceType *findResourceTypeAtIndex(OCResourceHandle handle, uint8_t index)
4277 {
4278     OCResource *resource = NULL;
4279     OCResourceType *pointer = NULL;
4280
4281     // Find the specified resource
4282     resource = findResource((OCResource *) handle);
4283     if (!resource)
4284     {
4285         return NULL;
4286     }
4287
4288     // Make sure a resource has a resourcetype
4289     if (!resource->rsrcType)
4290     {
4291         return NULL;
4292     }
4293
4294     // Iterate through the list
4295     pointer = resource->rsrcType;
4296     for(uint8_t i = 0; i< index && pointer; ++i)
4297     {
4298         pointer = pointer->next;
4299     }
4300     return pointer;
4301 }
4302
4303 OCResourceType *findResourceType(OCResourceType * resourceTypeList, const char * resourceTypeName)
4304 {
4305     if(resourceTypeList && resourceTypeName)
4306     {
4307         OCResourceType * rtPointer = resourceTypeList;
4308         while(resourceTypeName && rtPointer)
4309         {
4310             if(rtPointer->resourcetypename &&
4311                     strcmp(resourceTypeName, (const char *)
4312                     (rtPointer->resourcetypename)) == 0)
4313             {
4314                 break;
4315             }
4316             rtPointer = rtPointer->next;
4317         }
4318         return rtPointer;
4319     }
4320     return NULL;
4321 }
4322
4323 /*
4324  * Insert a new interface into interface linked list only if not already present.
4325  * If alredy present, 2nd arg is free'd.
4326  * Default interface will always be first if present.
4327  */
4328 void insertResourceInterface(OCResource *resource, OCResourceInterface *newInterface)
4329 {
4330     OCResourceInterface *pointer = NULL;
4331     OCResourceInterface *previous = NULL;
4332
4333     newInterface->next = NULL;
4334
4335     OCResourceInterface **firstInterface = &(resource->rsrcInterface);
4336
4337     if (!*firstInterface)
4338     {
4339         // If first interface is not oic.if.baseline, by default add it as first interface type.
4340         if (0 == strcmp(newInterface->name, OC_RSRVD_INTERFACE_DEFAULT))
4341         {
4342             *firstInterface = newInterface;
4343         }
4344         else
4345         {
4346             OCStackResult result = BindResourceInterfaceToResource(resource, OC_RSRVD_INTERFACE_DEFAULT);
4347             if (result != OC_STACK_OK)
4348             {
4349                 OICFree(newInterface->name);
4350                 OICFree(newInterface);
4351                 return;
4352             }
4353             if (*firstInterface)
4354             {
4355                 (*firstInterface)->next = newInterface;
4356             }
4357         }
4358     }
4359     // If once add oic.if.baseline, later too below code take care of freeing memory.
4360     else if (strcmp(newInterface->name, OC_RSRVD_INTERFACE_DEFAULT) == 0)
4361     {
4362         if (strcmp((*firstInterface)->name, OC_RSRVD_INTERFACE_DEFAULT) == 0)
4363         {
4364             OICFree(newInterface->name);
4365             OICFree(newInterface);
4366             return;
4367         }
4368         // This code will not hit anymore, keeping
4369         else
4370         {
4371             newInterface->next = *firstInterface;
4372             *firstInterface = newInterface;
4373         }
4374     }
4375     else
4376     {
4377         pointer = *firstInterface;
4378         while (pointer)
4379         {
4380             if (strcmp(newInterface->name, pointer->name) == 0)
4381             {
4382                 OICFree(newInterface->name);
4383                 OICFree(newInterface);
4384                 return;
4385             }
4386             previous = pointer;
4387             pointer = pointer->next;
4388         }
4389         previous->next = newInterface;
4390     }
4391 }
4392
4393 OCResourceInterface *findResourceInterfaceAtIndex(OCResourceHandle handle,
4394         uint8_t index)
4395 {
4396     OCResource *resource = NULL;
4397     OCResourceInterface *pointer = NULL;
4398
4399     // Find the specified resource
4400     resource = findResource((OCResource *) handle);
4401     if (!resource)
4402     {
4403         return NULL;
4404     }
4405
4406     // Make sure a resource has a resourceinterface
4407     if (!resource->rsrcInterface)
4408     {
4409         return NULL;
4410     }
4411
4412     // Iterate through the list
4413     pointer = resource->rsrcInterface;
4414
4415     for (uint8_t i = 0; i < index && pointer; ++i)
4416     {
4417         pointer = pointer->next;
4418     }
4419     return pointer;
4420 }
4421
4422 /*
4423  * This function splits the uri using the '?' delimiter.
4424  * "uriWithoutQuery" is the block of characters between the beginning
4425  * till the delimiter or '\0' which ever comes first.
4426  * "query" is whatever is to the right of the delimiter if present.
4427  * No delimiter sets the query to NULL.
4428  * If either are present, they will be malloc'ed into the params 2, 3.
4429  * The first param, *uri is left untouched.
4430
4431  * NOTE: This function does not account for whitespace at the end of the uri NOR
4432  *       malformed uri's with '??'. Whitespace at the end will be assumed to be
4433  *       part of the query.
4434  */
4435 OCStackResult getQueryFromUri(const char * uri, char** query, char ** uriWithoutQuery)
4436 {
4437     if(!uri)
4438     {
4439         return OC_STACK_INVALID_URI;
4440     }
4441     if(!query || !uriWithoutQuery)
4442     {
4443         return OC_STACK_INVALID_PARAM;
4444     }
4445
4446     *query           = NULL;
4447     *uriWithoutQuery = NULL;
4448
4449     size_t uriWithoutQueryLen = 0;
4450     size_t queryLen = 0;
4451     size_t uriLen = strlen(uri);
4452
4453     char *pointerToDelimiter = strstr(uri, "?");
4454
4455     uriWithoutQueryLen = pointerToDelimiter == NULL ? uriLen : (size_t)(pointerToDelimiter - uri);
4456     queryLen = pointerToDelimiter == NULL ? 0 : uriLen - uriWithoutQueryLen - 1;
4457
4458     if (uriWithoutQueryLen)
4459     {
4460         *uriWithoutQuery =  (char *) OICCalloc(uriWithoutQueryLen + 1, 1);
4461         if (!*uriWithoutQuery)
4462         {
4463             goto exit;
4464         }
4465         OICStrcpy(*uriWithoutQuery, uriWithoutQueryLen +1, uri);
4466     }
4467     if (queryLen)
4468     {
4469         *query = (char *) OICCalloc(queryLen + 1, 1);
4470         if (!*query)
4471         {
4472             OICFree(*uriWithoutQuery);
4473             *uriWithoutQuery = NULL;
4474             goto exit;
4475         }
4476         OICStrcpy(*query, queryLen + 1, pointerToDelimiter + 1);
4477     }
4478
4479     return OC_STACK_OK;
4480
4481     exit:
4482         return OC_STACK_NO_MEMORY;
4483 }
4484
4485 static const OicUuid_t* OCGetServerInstanceID(void)
4486 {
4487     static bool generated = false;
4488     static OicUuid_t sid;
4489     if (generated)
4490     {
4491         return &sid;
4492     }
4493
4494     if (OC_STACK_OK != GetDoxmDeviceID(&sid))
4495     {
4496         OIC_LOG(FATAL, TAG, "Generate UUID for Server Instance failed!");
4497         return NULL;
4498     }
4499     generated = true;
4500     return &sid;
4501 }
4502
4503 const char* OCGetServerInstanceIDString(void)
4504 {
4505     static bool generated = false;
4506     static char sidStr[UUID_STRING_SIZE];
4507
4508     if(generated)
4509     {
4510         return sidStr;
4511     }
4512
4513     const OicUuid_t *sid = OCGetServerInstanceID();
4514     if(OCConvertUuidToString(sid->id, sidStr) != RAND_UUID_OK)
4515     {
4516         OIC_LOG(FATAL, TAG, "Generate UUID String for Server Instance failed!");
4517         return NULL;
4518     }
4519
4520     generated = true;
4521     return sidStr;
4522 }
4523
4524 CAResult_t OCSelectNetwork()
4525 {
4526     CAResult_t retResult = CA_STATUS_FAILED;
4527     CAResult_t caResult = CA_STATUS_OK;
4528
4529     CATransportAdapter_t connTypes[] = {
4530             CA_ADAPTER_IP,
4531             CA_ADAPTER_RFCOMM_BTEDR,
4532             CA_ADAPTER_GATT_BTLE,
4533             CA_ADAPTER_NFC
4534 #ifdef RA_ADAPTER
4535             ,CA_ADAPTER_REMOTE_ACCESS
4536 #endif
4537
4538 #ifdef TCP_ADAPTER
4539             ,CA_ADAPTER_TCP
4540 #endif
4541         };
4542     int numConnTypes = sizeof(connTypes)/sizeof(connTypes[0]);
4543
4544     for(int i = 0; i<numConnTypes; i++)
4545     {
4546         // Ignore CA_NOT_SUPPORTED error. The CA Layer may have not compiled in the interface.
4547         if(caResult == CA_STATUS_OK || caResult == CA_NOT_SUPPORTED)
4548         {
4549            caResult = CASelectNetwork(connTypes[i]);
4550            if(caResult == CA_STATUS_OK)
4551            {
4552                retResult = CA_STATUS_OK;
4553            }
4554         }
4555     }
4556
4557     if(retResult != CA_STATUS_OK)
4558     {
4559         return caResult; // Returns error of appropriate transport that failed fatally.
4560     }
4561
4562     return retResult;
4563 }
4564
4565 OCStackResult CAResultToOCResult(CAResult_t caResult)
4566 {
4567     switch (caResult)
4568     {
4569         case CA_STATUS_OK:
4570             return OC_STACK_OK;
4571         case CA_STATUS_INVALID_PARAM:
4572             return OC_STACK_INVALID_PARAM;
4573         case CA_ADAPTER_NOT_ENABLED:
4574             return OC_STACK_ADAPTER_NOT_ENABLED;
4575         case CA_SERVER_STARTED_ALREADY:
4576             return OC_STACK_OK;
4577         case CA_SERVER_NOT_STARTED:
4578             return OC_STACK_ERROR;
4579         case CA_DESTINATION_NOT_REACHABLE:
4580             return OC_STACK_COMM_ERROR;
4581         case CA_SOCKET_OPERATION_FAILED:
4582             return OC_STACK_COMM_ERROR;
4583         case CA_SEND_FAILED:
4584             return OC_STACK_COMM_ERROR;
4585         case CA_RECEIVE_FAILED:
4586             return OC_STACK_COMM_ERROR;
4587         case CA_MEMORY_ALLOC_FAILED:
4588             return OC_STACK_NO_MEMORY;
4589         case CA_REQUEST_TIMEOUT:
4590             return OC_STACK_TIMEOUT;
4591         case CA_DESTINATION_DISCONNECTED:
4592             return OC_STACK_COMM_ERROR;
4593         case CA_STATUS_FAILED:
4594             return OC_STACK_ERROR;
4595         case CA_NOT_SUPPORTED:
4596             return OC_STACK_NOTIMPL;
4597         default:
4598             return OC_STACK_ERROR;
4599     }
4600 }