resource/csdk/security/src/directpairing.c

   1 /* *****************************************************************\r
   2  *\r
   3  * Copyright 2016 Samsung Electronics All Rights Reserved.\r
   4  *\r
   5  *\r
   6  *\r
   7  * Licensed under the Apache License, Version 2.0 (the "License");\r
   8  * you may not use this file except in compliance with the License.\r
   9  * You may obtain a copy of the License at\r
  10  *\r
  11  *     http://www.apache.org/licenses/LICENSE-2.0\r
  12  *\r
  13  * Unless required by applicable law or agreed to in writing, software\r
  14  * distributed under the License is distributed on an "AS IS" BASIS,\r
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  16  * See the License for the specific language governing permissions and\r
  17  * limitations under the License.\r
  18  *\r
  19  * *****************************************************************/\r
  20 #ifndef _POSIX_C_SOURCE\r
  21 #define _POSIX_C_SOURCE 200112L\r
  22 #endif\r
  23 #ifdef HAVE_UNISTD_H\r
  24 #include <unistd.h>\r
  25 #endif\r
  26 #ifdef HAVE_TIME_H\r
  27 #include <time.h>\r
  28 #endif\r
  29 #ifdef HAVE_SYS_TIME_H\r
  30 #include <sys/time.h>\r
  31 #endif\r
  32 #ifdef HAVE_STRING_H\r
  33 #include <string.h>\r
  34 #endif\r
  35 \r
  36 #include "ocstack.h"\r
  37 #include "oic_malloc.h"\r
  38 #include "oic_string.h"\r
  39 #include "logger.h"\r
  40 #include "cJSON.h"\r
  41 #include "utlist.h"\r
  42 #include "ocpayload.h"\r
  43 #include "payload_logging.h"\r
  44 #include "cainterface.h"\r
  45 \r
  46 #include "directpairing.h"\r
  47 #include "srmresourcestrings.h" //@note: SRM's internal header\r
  48 #include "doxmresource.h"       //@note: SRM's internal header\r
  49 #include "pconfresource.h"       //@note: SRM's internal header\r
  50 #include "dpairingresource.h"       //@note: SRM's internal header\r
  51 #include "credresource.h"\r
  52 \r
  53 #include "pmtypes.h"\r
  54 #include "pmutility.h"\r
  55 \r
  56 #include "srmutility.h"\r
  57 \r
  58 #ifdef __WITH_DTLS__\r
  59 #include "global.h"\r
  60 #endif\r
  61 \r
  62 \r
  63 #define TAG ("DP")\r
  64 static const uint16_t CBOR_SIZE = 1024;\r
  65 \r
  66 /**\r
  67  * Structure to carry direct-pairing API data to callback.\r
  68  */\r
  69 typedef struct DPairData\r
  70 {\r
  71     OCDirectPairingDev_t        *peer;                         /**< Pointer to pairing target info.**/\r
  72     char                                  pin[DP_PIN_LENGTH];  /**< PIN **/\r
  73     OCDirectPairingResultCB    resultCallback;           /**< Pointer to result callback.**/\r
  74     void *userCtx;                                      /** < user context to pass in callback **/\r
  75 } DPairData_t;\r
  76 \r
  77 static OCDirectPairingDev_t *g_dp_paired = NULL;\r
  78 static OCDirectPairingDev_t *g_dp_discover = NULL;\r
  79 static DPairData_t *g_dp_proceed_ctx = NULL;\r
  80 \r
  81 \r
  82 /**\r
  83  * Function to search node in linked list that matches given IP and port.\r
  84  *\r
  85  * @param[in] pList         List of OCProvisionDev_t.\r
  86  * @param[in] addr          address of target device.\r
  87  * @param[in] port          port of remote server.\r
  88  *\r
  89  * @return pointer of OCProvisionDev_t if exist, otherwise NULL\r
  90  */\r
  91 OCDirectPairingDev_t* getDev(OCDirectPairingDev_t **ppList, const char* addr, const uint16_t port)\r
  92 {\r
  93     if(NULL == addr)\r
  94     {\r
  95         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
  96         return NULL;\r
  97     }\r
  98 \r
  99     OCDirectPairingDev_t *ptr = NULL;\r
 100     LL_FOREACH(*ppList, ptr)\r
 101     {\r
 102         if( strcmp(ptr->endpoint.addr, addr) == 0 && port == ptr->endpoint.port)\r
 103         {\r
 104             return ptr;\r
 105         }\r
 106     }\r
 107 \r
 108     return NULL;\r
 109 }\r
 110 \r
 111 \r
 112 \r
 113 /**\r
 114  * Add device information to list.\r
 115  *\r
 116  * @param[in] pList         List of OCProvisionDev_t.\r
 117  * @param[in] addr          address of target device.\r
 118  * @param[in] port          port of remote server.\r
 119  * @param[in] adapter       adapter type of endpoint.\r
 120  * @param[in] doxm          pointer to doxm instance.\r
 121  * @param[in] connType  connectivity type of endpoint\r
 122  *\r
 123  * @return OC_STACK_OK for success and errorcode otherwise.\r
 124  */\r
 125 OCStackResult addDev(OCDirectPairingDev_t **ppList, OCDevAddr *endpoint,\r
 126                                       OCConnectivityType conn, OicSecPconf_t *pconf)\r
 127 {\r
 128     if(NULL == endpoint || NULL == pconf)\r
 129     {\r
 130         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
 131         return OC_STACK_INVALID_PARAM;\r
 132     }\r
 133 \r
 134     OCDirectPairingDev_t *ptr = getDev(ppList, endpoint->addr, endpoint->port);\r
 135     if(!ptr)\r
 136     {\r
 137         ptr = (OCDirectPairingDev_t *)OICCalloc(1, sizeof (OCDirectPairingDev_t));\r
 138         if (NULL == ptr)\r
 139         {\r
 140             OIC_LOG(ERROR, TAG, "Error while allocating memory for linkedlist node !!");\r
 141             return OC_STACK_NO_MEMORY;\r
 142         }\r
 143 \r
 144         memcpy(&ptr->endpoint, endpoint, sizeof(OCDevAddr));\r
 145         ptr->connType = conn;\r
 146         ptr->securePort = DEFAULT_SECURE_PORT;\r
 147         ptr->edp = pconf->edp;\r
 148         ptr->prm = pconf->prm;\r
 149         pconf->prm = NULL;  // to prevent free\r
 150         ptr->prmLen = pconf->prmLen;\r
 151         memcpy(&ptr->deviceID, &pconf->deviceID, sizeof(OicUuid_t));\r
 152         memcpy(&ptr->rowner, &pconf->rownerID, sizeof(OicUuid_t));\r
 153         ptr->next = NULL;\r
 154 \r
 155         LL_PREPEND(*ppList, ptr);\r
 156         OIC_LOG(INFO, TAG, "device added !");\r
 157     }\r
 158 \r
 159     return OC_STACK_OK;\r
 160 }\r
 161 \r
 162 \r
 163 /**\r
 164  * Add device information to list.\r
 165  *\r
 166  * @param[in] ppList         List of OCProvisionDev_t.\r
 167  * @param[in] pDev          target device.\r
 168  *\r
 169  * @return OC_STACK_OK for success and errorcode otherwise.\r
 170  */\r
 171 OCStackResult addDev2(OCDirectPairingDev_t **ppList, OCDirectPairingDev_t *pDev)\r
 172 {\r
 173     if(NULL == pDev)\r
 174     {\r
 175         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
 176         return OC_STACK_INVALID_PARAM;\r
 177     }\r
 178 \r
 179     OCDirectPairingDev_t *ptr = getDev(ppList, pDev->endpoint.addr, pDev->endpoint.port);\r
 180     if(!ptr)\r
 181     {\r
 182         ptr = (OCDirectPairingDev_t *)OICCalloc(1, sizeof (OCDirectPairingDev_t));\r
 183         if (NULL == ptr)\r
 184         {\r
 185             OIC_LOG(ERROR, TAG, "Error while allocating memory for linkedlist node !!");\r
 186             return OC_STACK_NO_MEMORY;\r
 187         }\r
 188 \r
 189         memcpy(&ptr->endpoint, &pDev->endpoint, sizeof(OCDevAddr));\r
 190         ptr->connType = pDev->connType;\r
 191         ptr->securePort = pDev->securePort;\r
 192         ptr->edp = pDev->edp;\r
 193         ptr->prmLen = pDev->prmLen;\r
 194         ptr->prm = (OicSecPrm_t*)OICCalloc(ptr->prmLen, sizeof (OicSecPrm_t));\r
 195         if (NULL == ptr->prm)\r
 196         {\r
 197             OIC_LOG(ERROR, TAG, "Error while allocating memory for prm !!");\r
 198             return OC_STACK_NO_MEMORY;\r
 199         }\r
 200         memcpy(ptr->prm, pDev->prm, sizeof(OicSecPrm_t)*ptr->prmLen);\r
 201         memcpy(&ptr->deviceID, &pDev->deviceID, sizeof(OicUuid_t));\r
 202         memcpy(&ptr->rowner, &pDev->rowner, sizeof(OicUuid_t));\r
 203         ptr->next = NULL;\r
 204 \r
 205         LL_PREPEND(*ppList, ptr);\r
 206         OIC_LOG(INFO, TAG, "device added !");\r
 207     }\r
 208 \r
 209     return OC_STACK_OK;\r
 210 }\r
 211 \r
 212 \r
 213 \r
 214 /**\r
 215  * This function deletes list of provision target devices\r
 216  *\r
 217  * @param[in] pDevicesList         List of OCProvisionDev_t.\r
 218  */\r
 219 void delList(OCDirectPairingDev_t *pList)\r
 220 {\r
 221     if(pList)\r
 222     {\r
 223         OCDirectPairingDev_t *del = NULL, *tmp = NULL;\r
 224         LL_FOREACH_SAFE(pList, del, tmp)\r
 225         {\r
 226             LL_DELETE(pList, del);\r
 227             if (del && del->prm)\r
 228             {\r
 229                 OICFree(del->prm);\r
 230             }\r
 231         }\r
 232     }\r
 233 }\r
 234 \r
 235 bool DPGenerateQuery(bool isSecure,\r
 236                      const char* address, const uint16_t port,\r
 237                      const OCConnectivityType connType,\r
 238                      char* buffer, size_t bufferSize, const char* uri)\r
 239 {\r
 240     if(!address || !buffer || !uri)\r
 241     {\r
 242         OIC_LOG(ERROR, TAG, "DPGenerateQuery : Invalid parameters.");\r
 243         return false;\r
 244     }\r
 245 \r
 246     static char QPREFIX_COAP[] =  "coap://";\r
 247     static char QPREFIX_COAPS[] = "coaps://";\r
 248     static char QPREFIX_COAP_TCP[] =  "coap+tcp://";\r
 249     static char QPREFIX_COAPS_TCP[] = "coaps+tcp://";\r
 250 \r
 251     int snRet = 0;\r
 252     char* prefix = (isSecure == true) ? QPREFIX_COAPS : QPREFIX_COAP;\r
 253 \r
 254     switch(connType & CT_MASK_ADAPTER)\r
 255     {\r
 256         case CT_ADAPTER_TCP:\r
 257             prefix = (isSecure == true) ? QPREFIX_COAPS_TCP : QPREFIX_COAP_TCP;\r
 258         case CT_ADAPTER_IP:\r
 259             switch(connType & CT_MASK_FLAGS & ~CT_FLAG_SECURE)\r
 260             {\r
 261                 case CT_IP_USE_V4:\r
 262                         snRet = snprintf(buffer, bufferSize, "%s%s:%d%s",\r
 263                                          prefix, address, port, uri);\r
 264                     break;\r
 265                 case CT_IP_USE_V6:\r
 266                         snRet = snprintf(buffer, bufferSize, "%s[%s]:%d%s",\r
 267                                          prefix, address, port, uri);\r
 268                     break;\r
 269                 default:\r
 270                     OIC_LOG(ERROR, TAG, "Unknown address format.");\r
 271                     return false;\r
 272             }\r
 273             // snprintf return value check\r
 274             if (snRet < 0)\r
 275             {\r
 276                 OIC_LOG_V(ERROR, TAG, "DPGenerateQuery : Error (snprintf) %d\n", snRet);\r
 277                 return false;\r
 278             }\r
 279             else if ((size_t)snRet >= bufferSize)\r
 280             {\r
 281                 OIC_LOG_V(ERROR, TAG, "DPGenerateQuery : Truncated (snprintf) %d\n", snRet);\r
 282                 return false;\r
 283             }\r
 284 \r
 285             break;\r
 286 #ifndef WITH_ARDUINO\r
 287         // TODO: We need to verify tinyDTLS in below cases\r
 288         case CT_ADAPTER_GATT_BTLE:\r
 289         case CT_ADAPTER_RFCOMM_BTEDR:\r
 290             OIC_LOG(ERROR, TAG, "Not supported connectivity adapter.");\r
 291             return false;\r
 292             break;\r
 293 #endif\r
 294         default:\r
 295             OIC_LOG(ERROR, TAG, "Unknown connectivity adapter.");\r
 296             return false;\r
 297     }\r
 298 \r
 299     return true;\r
 300 }\r
 301 \r
 302 const OCDirectPairingDev_t* DPGetDiscoveredDevices()\r
 303 {\r
 304     return g_dp_discover;\r
 305 }\r
 306 \r
 307 const OCDirectPairingDev_t* DPGetPairedDevices()\r
 308 {\r
 309     return g_dp_paired;\r
 310 }\r
 311 \r
 312 void DPDeleteLists()\r
 313 {\r
 314     delList(g_dp_discover);\r
 315     delList(g_dp_paired);\r
 316 }\r
 317 \r
 318 /**\r
 319  * Callback handler of FinalizeDirectPairing.\r
 320  *\r
 321  * @param[in] ctx             ctx value passed to callback from calling function.\r
 322  * @param[in] UNUSED          handle to an invocation\r
 323  * @param[in] clientResponse  Response from queries to remote servers.\r
 324  * @return  OC_STACK_DELETE_TRANSACTION to delete the transaction\r
 325  *          and  OC_STACK_KEEP_TRANSACTION to keep it.\r
 326  */\r
 327 static OCStackApplicationResult DirectPairingFinalizeHandler(void *ctx, OCDoHandle UNUSED,\r
 328                                                   OCClientResponse *clientResponse)\r
 329 {\r
 330     OIC_LOG_V(INFO, TAG, "IN DirectPairingFinalizeHandler()");\r
 331     (void)UNUSED;\r
 332     if(NULL == ctx)\r
 333     {\r
 334         OIC_LOG(ERROR, TAG, "Context is Null");\r
 335         return OC_STACK_DELETE_TRANSACTION;\r
 336     }\r
 337 \r
 338     OCStackResult res;\r
 339     DPairData_t *dpairData = (DPairData_t*)ctx;\r
 340     OCDirectPairingDev_t *peer = dpairData->peer;\r
 341     OCDirectPairingResultCB resultCallback = dpairData->resultCallback;\r
 342 \r
 343     if (clientResponse)\r
 344     {\r
 345         if(OC_STACK_RESOURCE_CHANGED == clientResponse->result)\r
 346         {\r
 347             // result\r
 348             OIC_LOG(INFO, TAG, "DirectPairingFinalizeHandler : success PUT"\r
 349                     " request to /oic/sec/dpairing");\r
 350 \r
 351             CAEndpoint_t endpoint;\r
 352             memset(&endpoint, 0x00, sizeof(CAEndpoint_t));\r
 353             OICStrcpy(endpoint.addr, MAX_ADDR_STR_SIZE_CA, peer->endpoint.addr);\r
 354             endpoint.addr[MAX_ADDR_STR_SIZE_CA - 1] = '\0';\r
 355             endpoint.port = peer->securePort;\r
 356 \r
 357             OicUuid_t ptDeviceID = {.id={0}};\r
 358             if (OC_STACK_OK != GetDoxmDeviceID(&ptDeviceID))\r
 359             {\r
 360                 OIC_LOG(ERROR, TAG, "Error while retrieving provisioning tool's device ID");\r
 361                 resultCallback(dpairData->userCtx, peer, OC_STACK_ERROR);\r
 362                 return OC_STACK_DELETE_TRANSACTION;\r
 363             }\r
 364 \r
 365 #ifdef __WITH_DTLS__\r
 366             res = SavePairingPSK((OCDevAddr*)&endpoint, &peer->deviceID, &ptDeviceID, false);\r
 367             if(OC_STACK_OK != res)\r
 368             {\r
 369                 OIC_LOG(ERROR, TAG, "Failed to PairingPSK generation");\r
 370                 resultCallback(dpairData->userCtx, peer, res);\r
 371                 return OC_STACK_DELETE_TRANSACTION;\r
 372             }\r
 373 \r
 374             //  close temporary sesion\r
 375             CAResult_t caResult = CACloseDtlsSession((const CAEndpoint_t*)&endpoint);\r
 376             if(CA_STATUS_OK != caResult)\r
 377             {\r
 378                 OIC_LOG(INFO, TAG, "Fail to close temporary dtls session");\r
 379             }\r
 380 \r
 381             caResult = CASelectCipherSuite(TLS_NULL_WITH_NULL_NULL, CA_ADAPTER_IP);\r
 382             if(CA_STATUS_OK != caResult)\r
 383             {\r
 384                 OIC_LOG(ERROR, TAG, "Failed to select TLS_NULL_WITH_NULL_NULL");\r
 385             }\r
 386 #endif // __WITH_DTLS__\r
 387 \r
 388             OIC_LOG(INFO, TAG, "Direct-Papring was successfully completed.");\r
 389 \r
 390             // update paired list\r
 391             OCDirectPairingDev_t *dev = getDev(&g_dp_discover, peer->endpoint.addr,\r
 392                     peer->endpoint.port);\r
 393             res = addDev2(&g_dp_paired, dev);\r
 394             if (OC_STACK_OK != res)\r
 395             {\r
 396                 OIC_LOG(ERROR, TAG, "Error while adding a device to paired list.");\r
 397             }\r
 398 \r
 399             resultCallback(dpairData->userCtx, peer, OC_STACK_OK);\r
 400 \r
 401             return OC_STACK_DELETE_TRANSACTION;\r
 402         }\r
 403         else\r
 404         {\r
 405             OIC_LOG(INFO, TAG, "Direct-Papring received error response.");\r
 406         }\r
 407     }\r
 408     else\r
 409     {\r
 410         OIC_LOG(ERROR, TAG, "DirectPairingFinalizeHandler received Null clientResponse");\r
 411     }\r
 412 \r
 413     resultCallback(dpairData->userCtx, peer, OC_STACK_ERROR);\r
 414     OICFree(dpairData);\r
 415     return OC_STACK_DELETE_TRANSACTION;\r
 416 }\r
 417 \r
 418 /**\r
 419  * Finalize direct-pairing .\r
 420  *\r
 421  * @param[in] peer  target device to establish direct-pairing.\r
 422  * @param[in] resultCallback  result event callback.\r
 423  *\r
 424  * @return OC_STACK_OK on success otherwise error.\r
 425  */\r
 426 OCStackResult FinalizeDirectPairing(void *ctx, OCDirectPairingDev_t* peer,\r
 427                                                      OCDirectPairingResultCB resultCallback)\r
 428 {\r
 429     if(NULL == peer)\r
 430     {\r
 431         return OC_STACK_INVALID_PARAM;\r
 432     }\r
 433 \r
 434     OicUuid_t deviceID =   {.id={0}};\r
 435     if (OC_STACK_OK != GetDoxmDeviceID(&deviceID))\r
 436     {\r
 437         OIC_LOG(ERROR, TAG, "Error while retrieving device ID");\r
 438         return OC_STACK_ERROR;\r
 439     }\r
 440 \r
 441     OicSecDpairing_t dpair;\r
 442     memset(&dpair, 0, sizeof(OicSecDpairing_t));\r
 443     dpair.spm = (OicSecPrm_t)PRM_NOT_ALLOWED;\r
 444     memcpy(&dpair.pdeviceID, &deviceID, sizeof(OicUuid_t));\r
 445 \r
 446     OCSecurityPayload* secPayload = (OCSecurityPayload*)OICCalloc(1, sizeof(OCSecurityPayload));\r
 447     if(!secPayload)\r
 448     {\r
 449         OIC_LOG(ERROR, TAG, "Failed to memory allocation");\r
 450         return OC_STACK_NO_MEMORY;\r
 451     }\r
 452     secPayload->base.type = PAYLOAD_TYPE_SECURITY;\r
 453 \r
 454     OCStackResult ret = DpairingToCBORPayload(&dpair, &(secPayload->securityData),\r
 455             &(secPayload->payloadSize));\r
 456 \r
 457     if(OC_STACK_OK != ret)\r
 458     {\r
 459         OICFree(secPayload);\r
 460         OIC_LOG(ERROR, TAG, "Failed to DpairingToCBORPayload");\r
 461         return OC_STACK_NO_MEMORY;\r
 462     }\r
 463     OIC_LOG(INFO, TAG, "DPARING CBOR data:");\r
 464     OIC_LOG_BUFFER(INFO, TAG, secPayload->securityData, secPayload->payloadSize);\r
 465 \r
 466     char query[MAX_URI_LENGTH + MAX_QUERY_LENGTH] = {0};\r
 467     if(!DPGenerateQuery(true,\r
 468                         peer->endpoint.addr,\r
 469                         peer->securePort,\r
 470                         peer->connType,\r
 471                         query, sizeof(query), OIC_RSRC_DPAIRING_URI))\r
 472     {\r
 473         OIC_LOG(ERROR, TAG, "DPDirectPairing : Failed to generate query");\r
 474         return OC_STACK_ERROR;\r
 475     }\r
 476     OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 477 \r
 478     DPairData_t *dpairData = (DPairData_t *) OICCalloc(1, sizeof(DPairData_t));\r
 479     if (dpairData == NULL)\r
 480     {\r
 481         OICFree(secPayload->securityData);\r
 482         OICFree(secPayload);\r
 483         OIC_LOG(ERROR, TAG, "Unable to allocate memory");\r
 484         return OC_STACK_NO_MEMORY;\r
 485     }\r
 486     dpairData->peer = peer;\r
 487     dpairData->resultCallback = resultCallback;\r
 488     dpairData->userCtx = ctx;\r
 489 \r
 490     OCCallbackData cbData =  {.context=NULL, .cb=NULL, .cd=NULL};\r
 491     cbData.cb = DirectPairingFinalizeHandler;\r
 492     cbData.context = (void*)dpairData;\r
 493     cbData.cd = NULL;\r
 494 \r
 495     OCMethod method = OC_REST_PUT;\r
 496     OCDoHandle handle = NULL;\r
 497     OIC_LOG(DEBUG, TAG, "Sending DPAIRNG setting to resource server");\r
 498     ret = OCDoResource(&handle, method, query,\r
 499             &peer->endpoint, (OCPayload*)secPayload,\r
 500             peer->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 501     if(OC_STACK_OK != ret)\r
 502     {\r
 503         OIC_LOG(ERROR, TAG, "error in OCDoResource");\r
 504         return OC_STACK_ERROR;\r
 505     }\r
 506 \r
 507     return OC_STACK_OK;\r
 508  }\r
 509 \r
 510 /**\r
 511  * Function to handle the handshake result in Direct-Pairing.\r
 512  * This function will be invoked after DTLS handshake\r
 513  * @param   endPoint  [IN] The remote endpoint.\r
 514  * @param   errorInfo [IN] Error information from the endpoint.\r
 515  * @return  NONE\r
 516  */\r
 517 void DirectPairingDTLSHandshakeCB(const CAEndpoint_t *endpoint, const CAErrorInfo_t *info)\r
 518 {\r
 519     OIC_LOG_V(INFO, TAG, "IN DirectPairingDTLSHandshakeCB");\r
 520 \r
 521 \r
 522     if(g_dp_proceed_ctx && g_dp_proceed_ctx->peer && endpoint && info)\r
 523     {\r
 524         OIC_LOG_V(INFO, TAG, "Received status from remote device(%s:%d) : %d",\r
 525                  endpoint->addr, endpoint->port, info->result);\r
 526 \r
 527         OCDirectPairingDev_t *peer = g_dp_proceed_ctx->peer;\r
 528         OCDirectPairingResultCB resultCallback = g_dp_proceed_ctx->resultCallback;\r
 529         OCStackResult res;\r
 530 \r
 531         //Make sure the address matches.\r
 532         if(strncmp(peer->endpoint.addr, endpoint->addr, sizeof(endpoint->addr)) == 0 &&\r
 533                          peer->securePort == endpoint->port)\r
 534         {\r
 535             //In case of success, send next coaps request.\r
 536             if(CA_STATUS_OK == info->result)\r
 537             {\r
 538                 OIC_LOG(INFO, TAG, "Now, finalize Direct-Pairing procedure.");\r
 539 \r
 540                 res = FinalizeDirectPairing(g_dp_proceed_ctx->userCtx, peer, resultCallback);\r
 541                 if(OC_STACK_OK != res)\r
 542                 {\r
 543                     OIC_LOG(ERROR, TAG, "Failed to finalize direct-pairing");\r
 544                     resultCallback(g_dp_proceed_ctx->userCtx, peer, res);\r
 545                 }\r
 546             }\r
 547             else if(CA_DTLS_AUTHENTICATION_FAILURE == info->result)\r
 548             {\r
 549                 OIC_LOG(INFO, TAG, "DirectPairingDTLSHandshakeCB - Authentication failed");\r
 550                 resultCallback(g_dp_proceed_ctx->userCtx, peer, OC_STACK_AUTHENTICATION_FAILURE);\r
 551             }\r
 552 \r
 553 #ifdef __WITH_DTLS__\r
 554             CARegisterDTLSHandshakeCallback(NULL);\r
 555 #endif // __WITH_DTLS__\r
 556             res = RemoveCredential(&peer->deviceID);\r
 557             if(OC_STACK_RESOURCE_DELETED != res)\r
 558             {\r
 559                 OIC_LOG_V(ERROR, TAG, "Failed to remove temporal PSK : %d", res);\r
 560             }\r
 561 \r
 562             OICFree(g_dp_proceed_ctx);\r
 563             g_dp_proceed_ctx = NULL;\r
 564         }\r
 565         else\r
 566         {\r
 567             OIC_LOG_V(INFO, TAG, "DirectPairingDTLSHandshakeCB - Not matched to peer address");\r
 568         }\r
 569     }\r
 570 \r
 571     OIC_LOG_V(INFO, TAG, "OUT DirectPairingDTLSHandshakeCB");\r
 572 }\r
 573 \r
 574 /**\r
 575  * Callback handler of DPDirectPairing.\r
 576  *\r
 577  * @param[in] ctx             ctx value passed to callback from calling function.\r
 578  * @param[in] UNUSED          handle to an invocation\r
 579  * @param[in] clientResponse  Response from queries to remote servers.\r
 580  * @return  OC_STACK_DELETE_TRANSACTION to delete the transaction\r
 581  *          and  OC_STACK_KEEP_TRANSACTION to keep it.\r
 582  */\r
 583 static OCStackApplicationResult DirectPairingHandler(void *ctx, OCDoHandle UNUSED,\r
 584                                                   OCClientResponse *clientResponse)\r
 585 {\r
 586     OIC_LOG_V(INFO, TAG, "IN DirectPairingHandler.");\r
 587     (void)UNUSED;\r
 588     if(NULL == ctx)\r
 589     {\r
 590         OIC_LOG(ERROR, TAG, "Context is Null");\r
 591         return OC_STACK_DELETE_TRANSACTION;\r
 592     }\r
 593 \r
 594     OCStackResult res = OC_STACK_ERROR;\r
 595     DPairData_t *dpairData = (DPairData_t*)ctx;\r
 596     OCDirectPairingResultCB resultCallback = (OCDirectPairingResultCB)dpairData->resultCallback;\r
 597     OicUuid_t subjectId = {.id={0}};\r
 598 \r
 599     if (clientResponse)\r
 600     {\r
 601         if(OC_STACK_RESOURCE_CHANGED == clientResponse->result)\r
 602         {\r
 603             // result\r
 604             OIC_LOG(INFO, TAG, "DirectPairingHandler : success POST request to /oic/sec/dpairing");\r
 605 \r
 606 #ifdef __WITH_DTLS__\r
 607             // Add temporary psk\r
 608             res = AddTmpPskWithPIN(&dpairData->peer->deviceID,\r
 609                            SYMMETRIC_PAIR_WISE_KEY,\r
 610                            (char*)dpairData->pin, DP_PIN_LENGTH,\r
 611                            &dpairData->peer->rowner, &subjectId);\r
 612             VERIFY_SUCCESS(TAG, OC_STACK_OK == res, ERROR);\r
 613 \r
 614 \r
 615             // Start to establish a secure channel with Pin-based PSK cipher suite\r
 616             CAResult_t caresult;\r
 617 \r
 618             caresult = CAEnableAnonECDHCipherSuite(false);\r
 619             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 620 \r
 621             caresult = CASelectCipherSuite(TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256, CA_ADAPTER_IP);\r
 622             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 623 \r
 624             //Register proceeding peer info. & DTLS event handler to catch the dtls event while handshake\r
 625             g_dp_proceed_ctx = dpairData;\r
 626             res = CARegisterDTLSHandshakeCallback(DirectPairingDTLSHandshakeCB);\r
 627             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 628 \r
 629             // initiate dtls\r
 630             CAEndpoint_t *endpoint = (CAEndpoint_t *)OICCalloc(1, sizeof (CAEndpoint_t));\r
 631             VERIFY_NON_NULL(TAG, endpoint, FATAL);\r
 632             memcpy(endpoint,&dpairData->peer->endpoint,sizeof(CAEndpoint_t));\r
 633             endpoint->port = dpairData->peer->securePort;\r
 634             OIC_LOG_V(INFO, TAG, "Initiate DTLS handshake to %s(%d)", endpoint->addr,\r
 635                     endpoint->port);\r
 636 \r
 637             caresult = CAInitiateHandshake(endpoint);\r
 638             OICFree(endpoint);\r
 639             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 640 #endif // __WITH_DTLS__\r
 641 \r
 642             res = OC_STACK_OK;\r
 643         }\r
 644         else\r
 645         {\r
 646             // result\r
 647             OIC_LOG(INFO, TAG, "DirectPairingHandler : fail POST request to /oic/sec/dpairing");\r
 648         }\r
 649     }\r
 650     else\r
 651     {\r
 652         OIC_LOG(ERROR, TAG, "DirectPairingHandler received Null clientResponse");\r
 653     }\r
 654 \r
 655 #ifdef __WITH_DTLS__\r
 656 exit:\r
 657 #endif // __WITH_DTLS__\r
 658 \r
 659     if (OC_STACK_OK != res)\r
 660     {\r
 661         if (0 < strlen((const char*)subjectId.id))\r
 662         {\r
 663             RemoveCredential(&dpairData->peer->deviceID);\r
 664             OICFree(dpairData);\r
 665             g_dp_proceed_ctx = NULL;\r
 666         }\r
 667 \r
 668         resultCallback(dpairData->userCtx, dpairData->peer, res);\r
 669     }\r
 670     OIC_LOG_V(INFO, TAG, "OUT DirectPairingHandler.");\r
 671     return OC_STACK_DELETE_TRANSACTION;\r
 672 }\r
 673 \r
 674 /**\r
 675  * Start direct-pairing .\r
 676  *\r
 677  * @param[in] peer  target device to establish direct-pairing.\r
 678  * @param[in] pmSel  selected pairing method.\r
 679  * @param[in] pinNumber  secret value for dtls connection.\r
 680  *\r
 681  * @return OC_STACK_OK on success otherwise error.\r
 682  */\r
 683 OCStackResult DPDirectPairing(void *ctx, OCDirectPairingDev_t* peer, OicSecPrm_t pmSel,\r
 684                                 char *pinNumber, OCDirectPairingResultCB resultCallback)\r
 685 {\r
 686     if(NULL == peer || NULL == pinNumber)\r
 687     {\r
 688         return OC_STACK_INVALID_PARAM;\r
 689     }\r
 690 \r
 691     OicUuid_t deviceID =   {.id={0}};\r
 692     if (OC_STACK_OK != GetDoxmDeviceID(&deviceID))\r
 693     {\r
 694         OIC_LOG(ERROR, TAG, "Error while retrieving device ID");\r
 695         return OC_STACK_ERROR;\r
 696     }\r
 697 \r
 698     OicSecDpairing_t dpair;\r
 699     memset(&dpair, 0, sizeof(OicSecDpairing_t));\r
 700     dpair.spm = pmSel;\r
 701     memcpy(&dpair.pdeviceID, &deviceID, sizeof(OicUuid_t));\r
 702 \r
 703     OCSecurityPayload* secPayload = (OCSecurityPayload*)OICCalloc(1, sizeof(OCSecurityPayload));\r
 704     if(!secPayload)\r
 705     {\r
 706         OIC_LOG(ERROR, TAG, "Failed to memory allocation");\r
 707         return OC_STACK_NO_MEMORY;\r
 708     }\r
 709     secPayload->base.type = PAYLOAD_TYPE_SECURITY;\r
 710 \r
 711     OCStackResult ret = DpairingToCBORPayload(&dpair, &(secPayload->securityData),\r
 712             &(secPayload->payloadSize));\r
 713 \r
 714     if(OC_STACK_OK != ret)\r
 715     {\r
 716         OICFree(secPayload);\r
 717         OIC_LOG(ERROR, TAG, "Failed to DpairingToCBORPayload");\r
 718         return OC_STACK_NO_MEMORY;\r
 719     }\r
 720     OIC_LOG(INFO, TAG, "DPARING CBOR data:");\r
 721     OIC_LOG_BUFFER(INFO, TAG, secPayload->securityData, secPayload->payloadSize);\r
 722 \r
 723     char query[MAX_URI_LENGTH + MAX_QUERY_LENGTH] = {0};\r
 724     if(!DPGenerateQuery(false,\r
 725                         peer->endpoint.addr,\r
 726                         peer->endpoint.port,\r
 727                         //peer->securePort,\r
 728                         peer->connType,\r
 729                         query, sizeof(query), OIC_RSRC_DPAIRING_URI))\r
 730     {\r
 731         OIC_LOG(ERROR, TAG, "DPDirectPairing : Failed to generate query");\r
 732         return OC_STACK_ERROR;\r
 733     }\r
 734     OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 735 \r
 736     DPairData_t *dpairData = (DPairData_t *) OICCalloc(1, sizeof(DPairData_t));\r
 737     if (dpairData == NULL)\r
 738     {\r
 739         OICFree(secPayload->securityData);\r
 740         OICFree(secPayload);\r
 741         OIC_LOG(ERROR, TAG, "Unable to allocate memory");\r
 742         return OC_STACK_NO_MEMORY;\r
 743     }\r
 744     dpairData->peer = peer;\r
 745     memcpy(dpairData->pin, pinNumber, DP_PIN_LENGTH);\r
 746     dpairData->resultCallback = resultCallback;\r
 747     dpairData->userCtx = ctx;\r
 748 \r
 749     OCCallbackData cbData =  {.context=NULL, .cb=NULL, .cd=NULL};\r
 750     cbData.cb = DirectPairingHandler;\r
 751     cbData.context = (void*)dpairData;\r
 752     cbData.cd = NULL;\r
 753 \r
 754     OCMethod method = OC_REST_POST;\r
 755     OCDoHandle handle = NULL;\r
 756     OIC_LOG(DEBUG, TAG, "Sending DPAIRNG setting to resource server");\r
 757     ret = OCDoResource(&handle, method, query,\r
 758             &peer->endpoint, (OCPayload*)secPayload,\r
 759             peer->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 760     if(OC_STACK_OK != ret)\r
 761     {\r
 762         OIC_LOG(ERROR, TAG, "error in OCDoResource");\r
 763         return OC_STACK_ERROR;\r
 764     }\r
 765 \r
 766     return OC_STACK_OK;\r
 767 \r
 768  }\r
 769 \r
 770 /**\r
 771  * Callback handler for getting secure port information using /oic/res discovery.\r
 772  *\r
 773  * @param[in] ctx             user context\r
 774  * @param[in] handle          Handle for response\r
 775  * @param[in] clientResponse  Response information(It will contain payload)\r
 776  *\r
 777  * @return OC_STACK_KEEP_TRANSACTION to keep transaction and\r
 778  *         OC_STACK_DELETE_TRANSACTION to delete it.\r
 779  */\r
 780 static OCStackApplicationResult DirectPairingPortDiscoveryHandler(void *ctx, OCDoHandle UNUSED,\r
 781                                  OCClientResponse *clientResponse)\r
 782 {\r
 783     OIC_LOG(INFO, TAG, "Callback Context for Direct-Pairing Secure Port DISCOVER "\r
 784             "query recvd successfully");\r
 785 \r
 786     (void)ctx;\r
 787     (void)UNUSED;\r
 788     if (clientResponse)\r
 789     {\r
 790         if  (NULL == clientResponse->payload)\r
 791         {\r
 792             OIC_LOG(INFO, TAG, "Skiping Null payload");\r
 793         }\r
 794         else\r
 795         {\r
 796             if (PAYLOAD_TYPE_DISCOVERY != clientResponse->payload->type)\r
 797             {\r
 798                 OIC_LOG(INFO, TAG, "Wrong payload type");\r
 799                 return OC_STACK_DELETE_TRANSACTION;\r
 800             }\r
 801 \r
 802             uint16_t securePort = 0;\r
 803             OCResourcePayload* resPayload = ((OCDiscoveryPayload*)clientResponse->payload)->resources;\r
 804             OIC_LOG_PAYLOAD(INFO, clientResponse->payload);\r
 805 \r
 806             if (resPayload && resPayload->secure)\r
 807             {\r
 808                 securePort = resPayload->port;\r
 809             }\r
 810             else\r
 811             {\r
 812                 OIC_LOG(INFO, TAG, "Can not find secure port information.");\r
 813                 return OC_STACK_DELETE_TRANSACTION;\r
 814             }\r
 815 \r
 816             OCDirectPairingDev_t *ptr = getDev(&g_dp_discover,\r
 817                     clientResponse->devAddr.addr, clientResponse->devAddr.port);\r
 818             if(!ptr)\r
 819             {\r
 820                 OIC_LOG(ERROR, TAG, "Can not find device information in the discovery device list");\r
 821                 return OC_STACK_DELETE_TRANSACTION;\r
 822             }\r
 823             ptr->securePort = securePort;\r
 824 \r
 825             OIC_LOG(INFO, TAG, "Exiting DirectPairingPortDiscoveryHandler.");\r
 826         }\r
 827 \r
 828         return  OC_STACK_DELETE_TRANSACTION;\r
 829     }\r
 830     else\r
 831     {\r
 832         OIC_LOG(INFO, TAG, "Skiping Null response");\r
 833     }\r
 834     return  OC_STACK_DELETE_TRANSACTION;\r
 835 }\r
 836 \r
 837 /**\r
 838  * Callback handler for DPDeviceDiscovery API.\r
 839  *\r
 840  * @param[in] ctx             User context\r
 841  * @param[in] handle          Handler for response\r
 842  * @param[in] clientResponse  Response information (It will contain payload)\r
 843  * @return OC_STACK_KEEP_TRANSACTION to keep transaction and\r
 844  *         OC_STACK_DELETE_TRANSACTION to delete it.\r
 845  */\r
 846 static OCStackApplicationResult DirectPairingDiscoveryHandler(void* ctx, OCDoHandle UNUSED,\r
 847         OCClientResponse * clientResponse)\r
 848 {\r
 849     OIC_LOG(INFO, TAG, "Callback Context for Direct-Pairing DISCOVER query recvd successfully");\r
 850 \r
 851     (void)ctx;\r
 852     (void)UNUSED;\r
 853     if (clientResponse)\r
 854     {\r
 855         OIC_LOG_V(INFO, TAG, "StackResult: %d", clientResponse->result);\r
 856         OIC_LOG_V(INFO, TAG,\r
 857                 "Device =============> Discovered @ %s:%d",\r
 858                 clientResponse->devAddr.addr,\r
 859                 clientResponse->devAddr.port);\r
 860 \r
 861         if  (NULL == clientResponse->payload)\r
 862         {\r
 863             OIC_LOG(INFO, TAG, "Skiping Null payload");\r
 864             return OC_STACK_KEEP_TRANSACTION;\r
 865         }\r
 866         if (OC_STACK_OK != clientResponse->result)\r
 867         {\r
 868             OIC_LOG(INFO, TAG, "Error in response");\r
 869             return OC_STACK_KEEP_TRANSACTION;\r
 870         }\r
 871 \r
 872         OIC_LOG_PAYLOAD(INFO, clientResponse->payload);\r
 873         OicSecPconf_t *pconf = NULL;\r
 874 \r
 875         OCStackResult res = CBORPayloadToPconf(\r
 876                 ((OCSecurityPayload*)clientResponse->payload)->securityData,\r
 877                 CBOR_SIZE,&pconf);\r
 878         if (OC_STACK_OK != res )\r
 879         {\r
 880             OIC_LOG(INFO, TAG, "Ignoring malformed CBOR");\r
 881             return OC_STACK_KEEP_TRANSACTION;\r
 882         }\r
 883         else\r
 884         {\r
 885             if(pconf->edp)\r
 886             {\r
 887                 OCDevAddr endpoint;\r
 888                 memcpy(&endpoint, &clientResponse->devAddr, sizeof(OCDevAddr));\r
 889 \r
 890                 OCStackResult res = addDev(&g_dp_discover, &endpoint,\r
 891                             clientResponse->connType, pconf);\r
 892                 DeletePconfBinData(pconf);\r
 893                 if (OC_STACK_OK != res)\r
 894                 {\r
 895                     OIC_LOG(ERROR, TAG, "Error while adding data to linkedlist.");\r
 896                     return OC_STACK_KEEP_TRANSACTION;\r
 897                 }\r
 898 \r
 899 \r
 900                 char rsrc_uri[MAX_URI_LENGTH+1] = {0};\r
 901                 int wr_len = snprintf(rsrc_uri, sizeof(rsrc_uri), "%s?%s=%s",\r
 902                           OC_RSRVD_WELL_KNOWN_URI, OC_RSRVD_RESOURCE_TYPE, OIC_RSRC_TYPE_SEC_DPAIRING);\r
 903                 if(wr_len <= 0 || (size_t)wr_len >= sizeof(rsrc_uri))\r
 904                 {\r
 905                     OIC_LOG(ERROR, TAG, "rsrc_uri_string_print failed");\r
 906                     return OC_STACK_KEEP_TRANSACTION;\r
 907                 }\r
 908 \r
 909                 //Try to the unicast discovery to getting secure port\r
 910                 char query[MAX_URI_LENGTH+MAX_QUERY_LENGTH+1] = {0};\r
 911                 if(!DPGenerateQuery(false,\r
 912                                     clientResponse->devAddr.addr, clientResponse->devAddr.port,\r
 913                                     clientResponse->connType,\r
 914                                     query, sizeof(query), rsrc_uri))\r
 915                 {\r
 916                     OIC_LOG(ERROR, TAG, "DirectPairingDiscoveryHandler : Failed to generate query");\r
 917                     return OC_STACK_KEEP_TRANSACTION;\r
 918                 }\r
 919                 OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 920 \r
 921                 OCCallbackData cbData;\r
 922                 cbData.cb = &DirectPairingPortDiscoveryHandler;\r
 923                 cbData.context = NULL;\r
 924                 cbData.cd = NULL;\r
 925                 OCStackResult ret = OCDoResource(NULL, OC_REST_DISCOVER, query, 0, 0,\r
 926                         clientResponse->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 927                 if(OC_STACK_OK != ret)\r
 928                 {\r
 929                     OIC_LOG(ERROR, TAG, "Failed to Secure Port Discovery");\r
 930                     return OC_STACK_KEEP_TRANSACTION;\r
 931                 }\r
 932                 else\r
 933                 {\r
 934                     OIC_LOG_V(INFO, TAG, "OCDoResource with [%s] Success", query);\r
 935                 }\r
 936             }\r
 937             return  OC_STACK_KEEP_TRANSACTION;\r
 938         }\r
 939     }\r
 940     else\r
 941     {\r
 942         OIC_LOG(INFO, TAG, "Skiping Null response");\r
 943     }\r
 944 \r
 945     return OC_STACK_DELETE_TRANSACTION;\r
 946 }\r
 947 #ifndef WITH_ARDUINO\r
 948 /**\r
 949  * Discover direct-pairing devices in the same IP subnet. .\r
 950  *\r
 951  * @param[in] waittime  Timeout in seconds.\r
 952  *\r
 953  * @return OC_STACK_OK on success otherwise error.\r
 954  */\r
 955 OCStackResult DPDeviceDiscovery(unsigned short waittime)\r
 956 {\r
 957     OIC_LOG(DEBUG, TAG, "IN DPDeviceDiscovery");\r
 958 \r
 959     if (g_dp_discover)\r
 960     {\r
 961         delList(g_dp_discover);\r
 962         g_dp_discover = NULL;\r
 963     }\r
 964 \r
 965     OCStackResult ret;\r
 966 \r
 967     const char DP_DISCOVERY_QUERY[] = "/oic/sec/pconf";\r
 968 \r
 969     OCCallbackData cbData;\r
 970     cbData.cb = DirectPairingDiscoveryHandler;\r
 971     cbData.context = NULL;\r
 972     cbData.cd = NULL;\r
 973 \r
 974     /* Start a DP discovery query*/\r
 975     OIC_LOG_V(INFO, TAG, "Initiating Direct-Pairing Discovery : %s\n", DP_DISCOVERY_QUERY);\r
 976     OCDoHandle handle = NULL;\r
 977     ret = OCDoResource(&handle, OC_REST_DISCOVER, DP_DISCOVERY_QUERY, 0, 0, CT_DEFAULT,\r
 978                        OC_LOW_QOS, &cbData, NULL, 0);\r
 979     if (ret != OC_STACK_OK)\r
 980     {\r
 981         OIC_LOG(ERROR, TAG, "OCStack resource error");\r
 982         return ret;\r
 983     }\r
 984 \r
 985     // wait..\r
 986 \r
 987     int clock_res = -1;\r
 988 #if defined(_MSC_VER)\r
 989     time_t startTime = NULL;\r
 990     clock_res = (time(&startTime) == -1);\r
 991 #else\r
 992     struct timespec startTime = {.tv_sec=0, .tv_nsec=0};\r
 993 #if defined(__ANDROID__) || _POSIX_TIMERS > 0\r
 994     clock_res = clock_gettime(CLOCK_MONOTONIC, &startTime);\r
 995 #endif\r
 996 #endif\r
 997     if (0 != clock_res)\r
 998     {\r
 999         OIC_LOG(ERROR, TAG, "clock error");\r
1000         if(OC_STACK_OK !=  OCCancel(handle, OC_LOW_QOS, NULL, 0))\r
1001         {\r
1002             OIC_LOG(ERROR, TAG, "Failed to remove registered callback");\r
1003         }\r
1004         return OC_STACK_ERROR;\r
1005     }\r
1006 \r
1007     while (1)\r
1008     {\r
1009 #if defined(_MSC_VER)\r
1010         time_t currTime = NULL;\r
1011         clock_res = (time(&currTime) == -1);\r
1012 #else\r
1013         struct timespec currTime  = {.tv_sec=0, .tv_nsec=0};\r
1014 #if defined(__ANDROID__) || _POSIX_TIMERS > 0\r
1015         clock_res = clock_gettime(CLOCK_MONOTONIC, &currTime);\r
1016 #endif\r
1017 #endif\r
1018         if (0 != clock_res)\r
1019         {\r
1020             OIC_LOG(ERROR, TAG, "clock error");\r
1021             ret = OC_STACK_ERROR;\r
1022             break;\r
1023         }\r
1024 #if defined(_MSC_VER)\r
1025         long elapsed = currTime - startTime;\r
1026 #else\r
1027         long elapsed = (currTime.tv_sec - startTime.tv_sec);\r
1028 #endif\r
1029         if (elapsed > waittime)\r
1030         {\r
1031             break;\r
1032         }\r
1033         else\r
1034         {\r
1035             struct timespec timeout = {.tv_sec=0, .tv_nsec=100000000L};\r
1036             OCProcess();\r
1037             nanosleep(&timeout, NULL);\r
1038         }\r
1039     }\r
1040 \r
1041     // Waiting for each response.\r
1042     ret = OCCancel(handle, OC_LOW_QOS, NULL, 0);\r
1043     if (OC_STACK_OK != ret)\r
1044     {\r
1045         OIC_LOG(ERROR, TAG, "Failed to remove registered callback");\r
1046     }\r
1047     OIC_LOG(DEBUG, TAG, "OUT DPDeviceDiscovery");\r
1048     return ret;\r
1049 }\r
1050 #endif\r