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 #include "iotivity_config.h"\r
  24 #ifdef HAVE_UNISTD_H\r
  25 #include <unistd.h>\r
  26 #endif\r
  27 #ifdef HAVE_TIME_H\r
  28 #include <time.h>\r
  29 #endif\r
  30 #ifdef HAVE_SYS_TIME_H\r
  31 #include <sys/time.h>\r
  32 #endif\r
  33 #ifdef HAVE_STRING_H\r
  34 #include <string.h>\r
  35 #endif\r
  36 \r
  37 #include "ocstack.h"\r
  38 #include "oic_malloc.h"\r
  39 #include "oic_string.h"\r
  40 #include "logger.h"\r
  41 #include "cJSON.h"\r
  42 #include "utlist.h"\r
  43 #include "ocpayload.h"\r
  44 #include "payload_logging.h"\r
  45 #include "cainterface.h"\r
  46 \r
  47 #include "directpairing.h"\r
  48 #include "srmresourcestrings.h" //@note: SRM's internal header\r
  49 #include "doxmresource.h"       //@note: SRM's internal header\r
  50 #include "pconfresource.h"       //@note: SRM's internal header\r
  51 #include "dpairingresource.h"       //@note: SRM's internal header\r
  52 #include "credresource.h"\r
  53 \r
  54 #include "pmtypes.h"\r
  55 #include "pmutility.h"\r
  56 \r
  57 #include "srmutility.h"\r
  58 \r
  59 #ifdef __WITH_DTLS__\r
  60 #include "global.h"\r
  61 #endif\r
  62 \r
  63 \r
  64 #define TAG ("DP")\r
  65 static const uint16_t CBOR_SIZE = 1024;\r
  66 \r
  67 /**\r
  68  * Structure to carry direct-pairing API data to callback.\r
  69  */\r
  70 typedef struct DPairData\r
  71 {\r
  72     OCDirectPairingDev_t        *peer;                         /**< Pointer to pairing target info.**/\r
  73     char                                  pin[DP_PIN_LENGTH];  /**< PIN **/\r
  74     OCDirectPairingResultCB    resultCallback;           /**< Pointer to result callback.**/\r
  75     void *userCtx;                                      /** < user context to pass in callback **/\r
  76 } DPairData_t;\r
  77 \r
  78 static OCDirectPairingDev_t *g_dp_paired = NULL;\r
  79 static OCDirectPairingDev_t *g_dp_discover = NULL;\r
  80 static DPairData_t *g_dp_proceed_ctx = NULL;\r
  81 \r
  82 \r
  83 /**\r
  84  * Function to search node in linked list that matches given IP and port.\r
  85  *\r
  86  * @param[in] pList         List of OCProvisionDev_t.\r
  87  * @param[in] addr          address of target device.\r
  88  * @param[in] port          port of remote server.\r
  89  *\r
  90  * @return pointer of OCProvisionDev_t if exist, otherwise NULL\r
  91  */\r
  92 OCDirectPairingDev_t* getDev(OCDirectPairingDev_t **ppList, const char* addr, const uint16_t port)\r
  93 {\r
  94     if(NULL == addr)\r
  95     {\r
  96         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
  97         return NULL;\r
  98     }\r
  99 \r
 100     OCDirectPairingDev_t *ptr = NULL;\r
 101     LL_FOREACH(*ppList, ptr)\r
 102     {\r
 103         if( strcmp(ptr->endpoint.addr, addr) == 0 && port == ptr->endpoint.port)\r
 104         {\r
 105             return ptr;\r
 106         }\r
 107     }\r
 108 \r
 109     return NULL;\r
 110 }\r
 111 \r
 112 \r
 113 \r
 114 /**\r
 115  * Add device information to list.\r
 116  *\r
 117  * @param[in] pList         List of OCProvisionDev_t.\r
 118  * @param[in] addr          address of target device.\r
 119  * @param[in] port          port of remote server.\r
 120  * @param[in] adapter       adapter type of endpoint.\r
 121  * @param[in] doxm          pointer to doxm instance.\r
 122  * @param[in] connType  connectivity type of endpoint\r
 123  *\r
 124  * @return OC_STACK_OK for success and errorcode otherwise.\r
 125  */\r
 126 OCStackResult addDev(OCDirectPairingDev_t **ppList, OCDevAddr *endpoint,\r
 127                                       OCConnectivityType conn, OicSecPconf_t *pconf)\r
 128 {\r
 129     if(NULL == endpoint || NULL == pconf)\r
 130     {\r
 131         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
 132         return OC_STACK_INVALID_PARAM;\r
 133     }\r
 134 \r
 135     OCDirectPairingDev_t *ptr = getDev(ppList, endpoint->addr, endpoint->port);\r
 136     if(!ptr)\r
 137     {\r
 138         ptr = (OCDirectPairingDev_t *)OICCalloc(1, sizeof (OCDirectPairingDev_t));\r
 139         if (NULL == ptr)\r
 140         {\r
 141             OIC_LOG(ERROR, TAG, "Error while allocating memory for linkedlist node !!");\r
 142             return OC_STACK_NO_MEMORY;\r
 143         }\r
 144 \r
 145         memcpy(&ptr->endpoint, endpoint, sizeof(OCDevAddr));\r
 146         ptr->connType = conn;\r
 147         ptr->securePort = DEFAULT_SECURE_PORT;\r
 148         ptr->edp = pconf->edp;\r
 149         ptr->prm = pconf->prm;\r
 150         pconf->prm = NULL;  // to prevent free\r
 151         ptr->prmLen = pconf->prmLen;\r
 152         memcpy(&ptr->deviceID, &pconf->deviceID, sizeof(OicUuid_t));\r
 153         memcpy(&ptr->rowner, &pconf->rownerID, sizeof(OicUuid_t));\r
 154         ptr->next = NULL;\r
 155 \r
 156         LL_PREPEND(*ppList, ptr);\r
 157         OIC_LOG(INFO, TAG, "device added !");\r
 158     }\r
 159 \r
 160     return OC_STACK_OK;\r
 161 }\r
 162 \r
 163 \r
 164 /**\r
 165  * Add device information to list.\r
 166  *\r
 167  * @param[in] ppList         List of OCProvisionDev_t.\r
 168  * @param[in] pDev          target device.\r
 169  *\r
 170  * @return OC_STACK_OK for success and errorcode otherwise.\r
 171  */\r
 172 OCStackResult addDev2(OCDirectPairingDev_t **ppList, OCDirectPairingDev_t *pDev)\r
 173 {\r
 174     if(NULL == pDev)\r
 175     {\r
 176         OIC_LOG_V(ERROR, TAG, "Invalid Input parameters in [%s]\n", __FUNCTION__);\r
 177         return OC_STACK_INVALID_PARAM;\r
 178     }\r
 179 \r
 180     OCDirectPairingDev_t *ptr = getDev(ppList, pDev->endpoint.addr, pDev->endpoint.port);\r
 181     if(!ptr)\r
 182     {\r
 183         ptr = (OCDirectPairingDev_t *)OICCalloc(1, sizeof (OCDirectPairingDev_t));\r
 184         if (NULL == ptr)\r
 185         {\r
 186             OIC_LOG(ERROR, TAG, "Error while allocating memory for linkedlist node !!");\r
 187             return OC_STACK_NO_MEMORY;\r
 188         }\r
 189 \r
 190         memcpy(&ptr->endpoint, &pDev->endpoint, sizeof(OCDevAddr));\r
 191         ptr->connType = pDev->connType;\r
 192         ptr->securePort = pDev->securePort;\r
 193         ptr->edp = pDev->edp;\r
 194         ptr->prmLen = pDev->prmLen;\r
 195         ptr->prm = (OicSecPrm_t*)OICCalloc(ptr->prmLen, sizeof (OicSecPrm_t));\r
 196         if (NULL == ptr->prm)\r
 197         {\r
 198             OIC_LOG(ERROR, TAG, "Error while allocating memory for prm !!");\r
 199             return OC_STACK_NO_MEMORY;\r
 200         }\r
 201         memcpy(ptr->prm, pDev->prm, sizeof(OicSecPrm_t)*ptr->prmLen);\r
 202         memcpy(&ptr->deviceID, &pDev->deviceID, sizeof(OicUuid_t));\r
 203         memcpy(&ptr->rowner, &pDev->rowner, sizeof(OicUuid_t));\r
 204         ptr->next = NULL;\r
 205 \r
 206         LL_PREPEND(*ppList, ptr);\r
 207         OIC_LOG(INFO, TAG, "device added !");\r
 208     }\r
 209 \r
 210     return OC_STACK_OK;\r
 211 }\r
 212 \r
 213 \r
 214 \r
 215 /**\r
 216  * This function deletes list of provision target devices\r
 217  *\r
 218  * @param[in] pDevicesList         List of OCProvisionDev_t.\r
 219  */\r
 220 void delList(OCDirectPairingDev_t *pList)\r
 221 {\r
 222     if(pList)\r
 223     {\r
 224         OCDirectPairingDev_t *del = NULL, *tmp = NULL;\r
 225         LL_FOREACH_SAFE(pList, del, tmp)\r
 226         {\r
 227             LL_DELETE(pList, del);\r
 228             if (del && del->prm)\r
 229             {\r
 230                 OICFree(del->prm);\r
 231             }\r
 232         }\r
 233     }\r
 234 }\r
 235 \r
 236 bool DPGenerateQuery(bool isSecure,\r
 237                      const char* address, const uint16_t port,\r
 238                      const OCConnectivityType connType,\r
 239                      char* buffer, size_t bufferSize, const char* uri)\r
 240 {\r
 241     if(!address || !buffer || !uri)\r
 242     {\r
 243         OIC_LOG(ERROR, TAG, "DPGenerateQuery : Invalid parameters.");\r
 244         return false;\r
 245     }\r
 246 \r
 247     static char QPREFIX_COAP[] =  "coap://";\r
 248     static char QPREFIX_COAPS[] = "coaps://";\r
 249     static char QPREFIX_COAP_TCP[] =  "coap+tcp://";\r
 250     static char QPREFIX_COAPS_TCP[] = "coaps+tcp://";\r
 251 \r
 252     int snRet = 0;\r
 253     char* prefix = (isSecure == true) ? QPREFIX_COAPS : QPREFIX_COAP;\r
 254 \r
 255     switch(connType & CT_MASK_ADAPTER)\r
 256     {\r
 257         case CT_ADAPTER_TCP:\r
 258             prefix = (isSecure == true) ? QPREFIX_COAPS_TCP : QPREFIX_COAP_TCP;\r
 259         case CT_ADAPTER_IP:\r
 260             switch(connType & CT_MASK_FLAGS & ~CT_FLAG_SECURE)\r
 261             {\r
 262                 case CT_IP_USE_V4:\r
 263                         snRet = snprintf(buffer, bufferSize, "%s%s:%d%s",\r
 264                                          prefix, address, port, uri);\r
 265                     break;\r
 266                 case CT_IP_USE_V6:\r
 267                         snRet = snprintf(buffer, bufferSize, "%s[%s]:%d%s",\r
 268                                          prefix, address, port, uri);\r
 269                     break;\r
 270                 default:\r
 271                     OIC_LOG(ERROR, TAG, "Unknown address format.");\r
 272                     return false;\r
 273             }\r
 274             // snprintf return value check\r
 275             if (snRet < 0)\r
 276             {\r
 277                 OIC_LOG_V(ERROR, TAG, "DPGenerateQuery : Error (snprintf) %d\n", snRet);\r
 278                 return false;\r
 279             }\r
 280             else if ((size_t)snRet >= bufferSize)\r
 281             {\r
 282                 OIC_LOG_V(ERROR, TAG, "DPGenerateQuery : Truncated (snprintf) %d\n", snRet);\r
 283                 return false;\r
 284             }\r
 285 \r
 286             break;\r
 287 #ifndef WITH_ARDUINO\r
 288         // TODO: We need to verify tinyDTLS in below cases\r
 289         case CT_ADAPTER_GATT_BTLE:\r
 290         case CT_ADAPTER_RFCOMM_BTEDR:\r
 291             OIC_LOG(ERROR, TAG, "Not supported connectivity adapter.");\r
 292             return false;\r
 293             break;\r
 294 #endif\r
 295         default:\r
 296             OIC_LOG(ERROR, TAG, "Unknown connectivity adapter.");\r
 297             return false;\r
 298     }\r
 299 \r
 300     return true;\r
 301 }\r
 302 \r
 303 const OCDirectPairingDev_t* DPGetDiscoveredDevices()\r
 304 {\r
 305     return g_dp_discover;\r
 306 }\r
 307 \r
 308 const OCDirectPairingDev_t* DPGetPairedDevices()\r
 309 {\r
 310     return g_dp_paired;\r
 311 }\r
 312 \r
 313 void DPDeleteLists()\r
 314 {\r
 315     delList(g_dp_discover);\r
 316     delList(g_dp_paired);\r
 317 }\r
 318 \r
 319 /**\r
 320  * Callback handler of FinalizeDirectPairing.\r
 321  *\r
 322  * @param[in] ctx             ctx value passed to callback from calling function.\r
 323  * @param[in] UNUSED          handle to an invocation\r
 324  * @param[in] clientResponse  Response from queries to remote servers.\r
 325  * @return  OC_STACK_DELETE_TRANSACTION to delete the transaction\r
 326  *          and  OC_STACK_KEEP_TRANSACTION to keep it.\r
 327  */\r
 328 static OCStackApplicationResult DirectPairingFinalizeHandler(void *ctx, OCDoHandle UNUSED,\r
 329                                                   OCClientResponse *clientResponse)\r
 330 {\r
 331     OIC_LOG_V(INFO, TAG, "IN DirectPairingFinalizeHandler()");\r
 332     (void)UNUSED;\r
 333     if(NULL == ctx)\r
 334     {\r
 335         OIC_LOG(ERROR, TAG, "Context is Null");\r
 336         return OC_STACK_DELETE_TRANSACTION;\r
 337     }\r
 338 \r
 339     OCStackResult res;\r
 340     DPairData_t *dpairData = (DPairData_t*)ctx;\r
 341     OCDirectPairingDev_t *peer = dpairData->peer;\r
 342     OCDirectPairingResultCB resultCallback = dpairData->resultCallback;\r
 343 \r
 344     if (clientResponse)\r
 345     {\r
 346         if(OC_STACK_RESOURCE_CHANGED == clientResponse->result)\r
 347         {\r
 348             // result\r
 349             OIC_LOG(INFO, TAG, "DirectPairingFinalizeHandler : success PUT"\r
 350                     " request to /oic/sec/dpairing");\r
 351 \r
 352             CAEndpoint_t endpoint;\r
 353             memset(&endpoint, 0x00, sizeof(CAEndpoint_t));\r
 354             OICStrcpy(endpoint.addr, MAX_ADDR_STR_SIZE_CA, peer->endpoint.addr);\r
 355             endpoint.addr[MAX_ADDR_STR_SIZE_CA - 1] = '\0';\r
 356             endpoint.port = peer->securePort;\r
 357 \r
 358             OicUuid_t ptDeviceID = {.id={0}};\r
 359             if (OC_STACK_OK != GetDoxmDeviceID(&ptDeviceID))\r
 360             {\r
 361                 OIC_LOG(ERROR, TAG, "Error while retrieving provisioning tool's device ID");\r
 362                 resultCallback(dpairData->userCtx, peer, OC_STACK_ERROR);\r
 363                 return OC_STACK_DELETE_TRANSACTION;\r
 364             }\r
 365 \r
 366 #ifdef __WITH_DTLS__\r
 367             res = SavePairingPSK((OCDevAddr*)&endpoint, &peer->deviceID, &ptDeviceID, false);\r
 368             if(OC_STACK_OK != res)\r
 369             {\r
 370                 OIC_LOG(ERROR, TAG, "Failed to PairingPSK generation");\r
 371                 resultCallback(dpairData->userCtx, peer, res);\r
 372                 return OC_STACK_DELETE_TRANSACTION;\r
 373             }\r
 374 \r
 375             //  close temporary sesion\r
 376             CAResult_t caResult = CACloseDtlsSession((const CAEndpoint_t*)&endpoint);\r
 377             if(CA_STATUS_OK != caResult)\r
 378             {\r
 379                 OIC_LOG(INFO, TAG, "Fail to close temporary dtls session");\r
 380             }\r
 381 \r
 382             caResult = CASelectCipherSuite(TLS_NULL_WITH_NULL_NULL, CA_ADAPTER_IP);\r
 383             if(CA_STATUS_OK != caResult)\r
 384             {\r
 385                 OIC_LOG(ERROR, TAG, "Failed to select TLS_NULL_WITH_NULL_NULL");\r
 386             }\r
 387 #endif // __WITH_DTLS__\r
 388 \r
 389             OIC_LOG(INFO, TAG, "Direct-Papring was successfully completed.");\r
 390 \r
 391             // update paired list\r
 392             OCDirectPairingDev_t *dev = getDev(&g_dp_discover, peer->endpoint.addr,\r
 393                     peer->endpoint.port);\r
 394             res = addDev2(&g_dp_paired, dev);\r
 395             if (OC_STACK_OK != res)\r
 396             {\r
 397                 OIC_LOG(ERROR, TAG, "Error while adding a device to paired list.");\r
 398             }\r
 399 \r
 400             resultCallback(dpairData->userCtx, peer, OC_STACK_OK);\r
 401 \r
 402             return OC_STACK_DELETE_TRANSACTION;\r
 403         }\r
 404         else\r
 405         {\r
 406             OIC_LOG(INFO, TAG, "Direct-Papring received error response.");\r
 407         }\r
 408     }\r
 409     else\r
 410     {\r
 411         OIC_LOG(ERROR, TAG, "DirectPairingFinalizeHandler received Null clientResponse");\r
 412     }\r
 413 \r
 414     resultCallback(dpairData->userCtx, peer, OC_STACK_ERROR);\r
 415     OICFree(dpairData);\r
 416     return OC_STACK_DELETE_TRANSACTION;\r
 417 }\r
 418 \r
 419 /**\r
 420  * Finalize direct-pairing .\r
 421  *\r
 422  * @param[in] peer  target device to establish direct-pairing.\r
 423  * @param[in] resultCallback  result event callback.\r
 424  *\r
 425  * @return OC_STACK_OK on success otherwise error.\r
 426  */\r
 427 OCStackResult FinalizeDirectPairing(void *ctx, OCDirectPairingDev_t* peer,\r
 428                                                      OCDirectPairingResultCB resultCallback)\r
 429 {\r
 430     if(NULL == peer)\r
 431     {\r
 432         return OC_STACK_INVALID_PARAM;\r
 433     }\r
 434 \r
 435     OicUuid_t deviceID =   {.id={0}};\r
 436     if (OC_STACK_OK != GetDoxmDeviceID(&deviceID))\r
 437     {\r
 438         OIC_LOG(ERROR, TAG, "Error while retrieving device ID");\r
 439         return OC_STACK_ERROR;\r
 440     }\r
 441 \r
 442     OicSecDpairing_t dpair;\r
 443     memset(&dpair, 0, sizeof(OicSecDpairing_t));\r
 444     dpair.spm = (OicSecPrm_t)PRM_NOT_ALLOWED;\r
 445     memcpy(&dpair.pdeviceID, &deviceID, sizeof(OicUuid_t));\r
 446 \r
 447     OCSecurityPayload* secPayload = (OCSecurityPayload*)OICCalloc(1, sizeof(OCSecurityPayload));\r
 448     if(!secPayload)\r
 449     {\r
 450         OIC_LOG(ERROR, TAG, "Failed to memory allocation");\r
 451         return OC_STACK_NO_MEMORY;\r
 452     }\r
 453     secPayload->base.type = PAYLOAD_TYPE_SECURITY;\r
 454 \r
 455     OCStackResult ret = DpairingToCBORPayload(&dpair, &(secPayload->securityData),\r
 456             &(secPayload->payloadSize));\r
 457 \r
 458     if(OC_STACK_OK != ret)\r
 459     {\r
 460         OICFree(secPayload);\r
 461         OIC_LOG(ERROR, TAG, "Failed to DpairingToCBORPayload");\r
 462         return OC_STACK_NO_MEMORY;\r
 463     }\r
 464     OIC_LOG(INFO, TAG, "DPARING CBOR data:");\r
 465     OIC_LOG_BUFFER(INFO, TAG, secPayload->securityData, secPayload->payloadSize);\r
 466 \r
 467     char query[MAX_URI_LENGTH + MAX_QUERY_LENGTH] = {0};\r
 468     if(!DPGenerateQuery(true,\r
 469                         peer->endpoint.addr,\r
 470                         peer->securePort,\r
 471                         peer->connType,\r
 472                         query, sizeof(query), OIC_RSRC_DPAIRING_URI))\r
 473     {\r
 474         OIC_LOG(ERROR, TAG, "DPDirectPairing : Failed to generate query");\r
 475         return OC_STACK_ERROR;\r
 476     }\r
 477     OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 478 \r
 479     DPairData_t *dpairData = (DPairData_t *) OICCalloc(1, sizeof(DPairData_t));\r
 480     if (dpairData == NULL)\r
 481     {\r
 482         OICFree(secPayload->securityData);\r
 483         OICFree(secPayload);\r
 484         OIC_LOG(ERROR, TAG, "Unable to allocate memory");\r
 485         return OC_STACK_NO_MEMORY;\r
 486     }\r
 487     dpairData->peer = peer;\r
 488     dpairData->resultCallback = resultCallback;\r
 489     dpairData->userCtx = ctx;\r
 490 \r
 491     OCCallbackData cbData =  {.context=NULL, .cb=NULL, .cd=NULL};\r
 492     cbData.cb = DirectPairingFinalizeHandler;\r
 493     cbData.context = (void*)dpairData;\r
 494     cbData.cd = NULL;\r
 495 \r
 496     OCMethod method = OC_REST_PUT;\r
 497     OCDoHandle handle = NULL;\r
 498     OIC_LOG(DEBUG, TAG, "Sending DPAIRNG setting to resource server");\r
 499     ret = OCDoResource(&handle, method, query,\r
 500             &peer->endpoint, (OCPayload*)secPayload,\r
 501             peer->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 502     if(OC_STACK_OK != ret)\r
 503     {\r
 504         OIC_LOG(ERROR, TAG, "error in OCDoResource");\r
 505         return OC_STACK_ERROR;\r
 506     }\r
 507 \r
 508     return OC_STACK_OK;\r
 509  }\r
 510 \r
 511 /**\r
 512  * Function to handle the handshake result in Direct-Pairing.\r
 513  * This function will be invoked after DTLS handshake\r
 514  * @param   endPoint  [IN] The remote endpoint.\r
 515  * @param   errorInfo [IN] Error information from the endpoint.\r
 516  * @return  NONE\r
 517  */\r
 518 void DirectPairingDTLSHandshakeCB(const CAEndpoint_t *endpoint, const CAErrorInfo_t *info)\r
 519 {\r
 520     OIC_LOG_V(INFO, TAG, "IN DirectPairingDTLSHandshakeCB");\r
 521 \r
 522 \r
 523     if(g_dp_proceed_ctx && g_dp_proceed_ctx->peer && endpoint && info)\r
 524     {\r
 525         OIC_LOG_V(INFO, TAG, "Received status from remote device(%s:%d) : %d",\r
 526                  endpoint->addr, endpoint->port, info->result);\r
 527 \r
 528         OCDirectPairingDev_t *peer = g_dp_proceed_ctx->peer;\r
 529         OCDirectPairingResultCB resultCallback = g_dp_proceed_ctx->resultCallback;\r
 530         OCStackResult res;\r
 531 \r
 532         //Make sure the address matches.\r
 533         if(strncmp(peer->endpoint.addr, endpoint->addr, sizeof(endpoint->addr)) == 0 &&\r
 534                          peer->securePort == endpoint->port)\r
 535         {\r
 536             //In case of success, send next coaps request.\r
 537             if(CA_STATUS_OK == info->result)\r
 538             {\r
 539                 OIC_LOG(INFO, TAG, "Now, finalize Direct-Pairing procedure.");\r
 540 \r
 541                 res = FinalizeDirectPairing(g_dp_proceed_ctx->userCtx, peer, resultCallback);\r
 542                 if(OC_STACK_OK != res)\r
 543                 {\r
 544                     OIC_LOG(ERROR, TAG, "Failed to finalize direct-pairing");\r
 545                     resultCallback(g_dp_proceed_ctx->userCtx, peer, res);\r
 546                 }\r
 547             }\r
 548             else if(CA_DTLS_AUTHENTICATION_FAILURE == info->result)\r
 549             {\r
 550                 OIC_LOG(INFO, TAG, "DirectPairingDTLSHandshakeCB - Authentication failed");\r
 551                 resultCallback(g_dp_proceed_ctx->userCtx, peer, OC_STACK_AUTHENTICATION_FAILURE);\r
 552             }\r
 553 \r
 554 #ifdef __WITH_DTLS__\r
 555             CARegisterDTLSHandshakeCallback(NULL);\r
 556 #endif // __WITH_DTLS__\r
 557             res = RemoveCredential(&peer->deviceID);\r
 558             if(OC_STACK_RESOURCE_DELETED != res)\r
 559             {\r
 560                 OIC_LOG_V(ERROR, TAG, "Failed to remove temporal PSK : %d", res);\r
 561             }\r
 562 \r
 563             OICFree(g_dp_proceed_ctx);\r
 564             g_dp_proceed_ctx = NULL;\r
 565         }\r
 566         else\r
 567         {\r
 568             OIC_LOG_V(INFO, TAG, "DirectPairingDTLSHandshakeCB - Not matched to peer address");\r
 569         }\r
 570     }\r
 571 \r
 572     OIC_LOG_V(INFO, TAG, "OUT DirectPairingDTLSHandshakeCB");\r
 573 }\r
 574 \r
 575 /**\r
 576  * Callback handler of DPDirectPairing.\r
 577  *\r
 578  * @param[in] ctx             ctx value passed to callback from calling function.\r
 579  * @param[in] UNUSED          handle to an invocation\r
 580  * @param[in] clientResponse  Response from queries to remote servers.\r
 581  * @return  OC_STACK_DELETE_TRANSACTION to delete the transaction\r
 582  *          and  OC_STACK_KEEP_TRANSACTION to keep it.\r
 583  */\r
 584 static OCStackApplicationResult DirectPairingHandler(void *ctx, OCDoHandle UNUSED,\r
 585                                                   OCClientResponse *clientResponse)\r
 586 {\r
 587     OIC_LOG_V(INFO, TAG, "IN DirectPairingHandler.");\r
 588     (void)UNUSED;\r
 589     if(NULL == ctx)\r
 590     {\r
 591         OIC_LOG(ERROR, TAG, "Context is Null");\r
 592         return OC_STACK_DELETE_TRANSACTION;\r
 593     }\r
 594 \r
 595     OCStackResult res = OC_STACK_ERROR;\r
 596     DPairData_t *dpairData = (DPairData_t*)ctx;\r
 597     OCDirectPairingResultCB resultCallback = (OCDirectPairingResultCB)dpairData->resultCallback;\r
 598     OicUuid_t subjectId = {.id={0}};\r
 599 \r
 600     if (clientResponse)\r
 601     {\r
 602         if(OC_STACK_RESOURCE_CHANGED == clientResponse->result)\r
 603         {\r
 604             // result\r
 605             OIC_LOG(INFO, TAG, "DirectPairingHandler : success POST request to /oic/sec/dpairing");\r
 606 \r
 607 #ifdef __WITH_DTLS__\r
 608             // Add temporary psk\r
 609             res = AddTmpPskWithPIN(&dpairData->peer->deviceID,\r
 610                            SYMMETRIC_PAIR_WISE_KEY,\r
 611                            (char*)dpairData->pin, DP_PIN_LENGTH,\r
 612                            &dpairData->peer->rowner, &subjectId);\r
 613             VERIFY_SUCCESS(TAG, OC_STACK_OK == res, ERROR);\r
 614 \r
 615 \r
 616             // Start to establish a secure channel with Pin-based PSK cipher suite\r
 617             CAResult_t caresult;\r
 618 \r
 619             caresult = CAEnableAnonECDHCipherSuite(false);\r
 620             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 621 \r
 622             caresult = CASelectCipherSuite(TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256, CA_ADAPTER_IP);\r
 623             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 624 \r
 625             //Register proceeding peer info. & DTLS event handler to catch the dtls event while handshake\r
 626             g_dp_proceed_ctx = dpairData;\r
 627             res = CARegisterDTLSHandshakeCallback(DirectPairingDTLSHandshakeCB);\r
 628             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 629 \r
 630             // initiate dtls\r
 631             CAEndpoint_t *endpoint = (CAEndpoint_t *)OICCalloc(1, sizeof (CAEndpoint_t));\r
 632             VERIFY_NON_NULL(TAG, endpoint, FATAL);\r
 633             memcpy(endpoint,&dpairData->peer->endpoint,sizeof(CAEndpoint_t));\r
 634             endpoint->port = dpairData->peer->securePort;\r
 635             OIC_LOG_V(INFO, TAG, "Initiate DTLS handshake to %s(%d)", endpoint->addr,\r
 636                     endpoint->port);\r
 637 \r
 638             caresult = CAInitiateHandshake(endpoint);\r
 639             OICFree(endpoint);\r
 640             VERIFY_SUCCESS(TAG, CA_STATUS_OK == caresult, ERROR);\r
 641 #endif // __WITH_DTLS__\r
 642 \r
 643             res = OC_STACK_OK;\r
 644         }\r
 645         else\r
 646         {\r
 647             // result\r
 648             OIC_LOG(INFO, TAG, "DirectPairingHandler : fail POST request to /oic/sec/dpairing");\r
 649         }\r
 650     }\r
 651     else\r
 652     {\r
 653         OIC_LOG(ERROR, TAG, "DirectPairingHandler received Null clientResponse");\r
 654     }\r
 655 \r
 656 #ifdef __WITH_DTLS__\r
 657 exit:\r
 658 #endif // __WITH_DTLS__\r
 659 \r
 660     if (OC_STACK_OK != res)\r
 661     {\r
 662         if (0 < strlen((const char*)subjectId.id))\r
 663         {\r
 664             RemoveCredential(&dpairData->peer->deviceID);\r
 665             OICFree(dpairData);\r
 666             g_dp_proceed_ctx = NULL;\r
 667         }\r
 668 \r
 669         resultCallback(dpairData->userCtx, dpairData->peer, res);\r
 670     }\r
 671     OIC_LOG_V(INFO, TAG, "OUT DirectPairingHandler.");\r
 672     return OC_STACK_DELETE_TRANSACTION;\r
 673 }\r
 674 \r
 675 /**\r
 676  * Start direct-pairing .\r
 677  *\r
 678  * @param[in] peer  target device to establish direct-pairing.\r
 679  * @param[in] pmSel  selected pairing method.\r
 680  * @param[in] pinNumber  secret value for dtls connection.\r
 681  *\r
 682  * @return OC_STACK_OK on success otherwise error.\r
 683  */\r
 684 OCStackResult DPDirectPairing(void *ctx, OCDirectPairingDev_t* peer, OicSecPrm_t pmSel,\r
 685                                 char *pinNumber, OCDirectPairingResultCB resultCallback)\r
 686 {\r
 687     if(NULL == peer || NULL == pinNumber)\r
 688     {\r
 689         return OC_STACK_INVALID_PARAM;\r
 690     }\r
 691 \r
 692     OicUuid_t deviceID =   {.id={0}};\r
 693     if (OC_STACK_OK != GetDoxmDeviceID(&deviceID))\r
 694     {\r
 695         OIC_LOG(ERROR, TAG, "Error while retrieving device ID");\r
 696         return OC_STACK_ERROR;\r
 697     }\r
 698 \r
 699     OicSecDpairing_t dpair;\r
 700     memset(&dpair, 0, sizeof(OicSecDpairing_t));\r
 701     dpair.spm = pmSel;\r
 702     memcpy(&dpair.pdeviceID, &deviceID, sizeof(OicUuid_t));\r
 703 \r
 704     OCSecurityPayload* secPayload = (OCSecurityPayload*)OICCalloc(1, sizeof(OCSecurityPayload));\r
 705     if(!secPayload)\r
 706     {\r
 707         OIC_LOG(ERROR, TAG, "Failed to memory allocation");\r
 708         return OC_STACK_NO_MEMORY;\r
 709     }\r
 710     secPayload->base.type = PAYLOAD_TYPE_SECURITY;\r
 711 \r
 712     OCStackResult ret = DpairingToCBORPayload(&dpair, &(secPayload->securityData),\r
 713             &(secPayload->payloadSize));\r
 714 \r
 715     if(OC_STACK_OK != ret)\r
 716     {\r
 717         OICFree(secPayload);\r
 718         OIC_LOG(ERROR, TAG, "Failed to DpairingToCBORPayload");\r
 719         return OC_STACK_NO_MEMORY;\r
 720     }\r
 721     OIC_LOG(INFO, TAG, "DPARING CBOR data:");\r
 722     OIC_LOG_BUFFER(INFO, TAG, secPayload->securityData, secPayload->payloadSize);\r
 723 \r
 724     char query[MAX_URI_LENGTH + MAX_QUERY_LENGTH] = {0};\r
 725     if(!DPGenerateQuery(false,\r
 726                         peer->endpoint.addr,\r
 727                         peer->endpoint.port,\r
 728                         //peer->securePort,\r
 729                         peer->connType,\r
 730                         query, sizeof(query), OIC_RSRC_DPAIRING_URI))\r
 731     {\r
 732         OIC_LOG(ERROR, TAG, "DPDirectPairing : Failed to generate query");\r
 733         return OC_STACK_ERROR;\r
 734     }\r
 735     OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 736 \r
 737     DPairData_t *dpairData = (DPairData_t *) OICCalloc(1, sizeof(DPairData_t));\r
 738     if (dpairData == NULL)\r
 739     {\r
 740         OICFree(secPayload->securityData);\r
 741         OICFree(secPayload);\r
 742         OIC_LOG(ERROR, TAG, "Unable to allocate memory");\r
 743         return OC_STACK_NO_MEMORY;\r
 744     }\r
 745     dpairData->peer = peer;\r
 746     memcpy(dpairData->pin, pinNumber, DP_PIN_LENGTH);\r
 747     dpairData->resultCallback = resultCallback;\r
 748     dpairData->userCtx = ctx;\r
 749 \r
 750     OCCallbackData cbData =  {.context=NULL, .cb=NULL, .cd=NULL};\r
 751     cbData.cb = DirectPairingHandler;\r
 752     cbData.context = (void*)dpairData;\r
 753     cbData.cd = NULL;\r
 754 \r
 755     OCMethod method = OC_REST_POST;\r
 756     OCDoHandle handle = NULL;\r
 757     OIC_LOG(DEBUG, TAG, "Sending DPAIRNG setting to resource server");\r
 758     ret = OCDoResource(&handle, method, query,\r
 759             &peer->endpoint, (OCPayload*)secPayload,\r
 760             peer->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 761     if(OC_STACK_OK != ret)\r
 762     {\r
 763         OIC_LOG(ERROR, TAG, "error in OCDoResource");\r
 764         return OC_STACK_ERROR;\r
 765     }\r
 766 \r
 767     return OC_STACK_OK;\r
 768 \r
 769  }\r
 770 \r
 771 /**\r
 772  * Callback handler for getting secure port information using /oic/res discovery.\r
 773  *\r
 774  * @param[in] ctx             user context\r
 775  * @param[in] handle          Handle for response\r
 776  * @param[in] clientResponse  Response information(It will contain payload)\r
 777  *\r
 778  * @return OC_STACK_KEEP_TRANSACTION to keep transaction and\r
 779  *         OC_STACK_DELETE_TRANSACTION to delete it.\r
 780  */\r
 781 static OCStackApplicationResult DirectPairingPortDiscoveryHandler(void *ctx, OCDoHandle UNUSED,\r
 782                                  OCClientResponse *clientResponse)\r
 783 {\r
 784     OIC_LOG(INFO, TAG, "Callback Context for Direct-Pairing Secure Port DISCOVER "\r
 785             "query recvd successfully");\r
 786 \r
 787     (void)ctx;\r
 788     (void)UNUSED;\r
 789     if (clientResponse)\r
 790     {\r
 791         if  (NULL == clientResponse->payload)\r
 792         {\r
 793             OIC_LOG(INFO, TAG, "Skiping Null payload");\r
 794         }\r
 795         else\r
 796         {\r
 797             if (PAYLOAD_TYPE_DISCOVERY != clientResponse->payload->type)\r
 798             {\r
 799                 OIC_LOG(INFO, TAG, "Wrong payload type");\r
 800                 return OC_STACK_DELETE_TRANSACTION;\r
 801             }\r
 802 \r
 803             uint16_t securePort = 0;\r
 804             OCResourcePayload* resPayload = ((OCDiscoveryPayload*)clientResponse->payload)->resources;\r
 805             OIC_LOG_PAYLOAD(INFO, clientResponse->payload);\r
 806 \r
 807             if (resPayload && resPayload->secure)\r
 808             {\r
 809                 securePort = resPayload->port;\r
 810             }\r
 811             else\r
 812             {\r
 813                 OIC_LOG(INFO, TAG, "Can not find secure port information.");\r
 814                 return OC_STACK_DELETE_TRANSACTION;\r
 815             }\r
 816 \r
 817             OCDirectPairingDev_t *ptr = getDev(&g_dp_discover,\r
 818                     clientResponse->devAddr.addr, clientResponse->devAddr.port);\r
 819             if(!ptr)\r
 820             {\r
 821                 OIC_LOG(ERROR, TAG, "Can not find device information in the discovery device list");\r
 822                 return OC_STACK_DELETE_TRANSACTION;\r
 823             }\r
 824             ptr->securePort = securePort;\r
 825 \r
 826             OIC_LOG(INFO, TAG, "Exiting DirectPairingPortDiscoveryHandler.");\r
 827         }\r
 828 \r
 829         return  OC_STACK_DELETE_TRANSACTION;\r
 830     }\r
 831     else\r
 832     {\r
 833         OIC_LOG(INFO, TAG, "Skiping Null response");\r
 834     }\r
 835     return  OC_STACK_DELETE_TRANSACTION;\r
 836 }\r
 837 \r
 838 /**\r
 839  * Callback handler for DPDeviceDiscovery API.\r
 840  *\r
 841  * @param[in] ctx             User context\r
 842  * @param[in] handle          Handler for response\r
 843  * @param[in] clientResponse  Response information (It will contain payload)\r
 844  * @return OC_STACK_KEEP_TRANSACTION to keep transaction and\r
 845  *         OC_STACK_DELETE_TRANSACTION to delete it.\r
 846  */\r
 847 static OCStackApplicationResult DirectPairingDiscoveryHandler(void* ctx, OCDoHandle UNUSED,\r
 848         OCClientResponse * clientResponse)\r
 849 {\r
 850     OIC_LOG(INFO, TAG, "Callback Context for Direct-Pairing DISCOVER query recvd successfully");\r
 851 \r
 852     (void)ctx;\r
 853     (void)UNUSED;\r
 854     if (clientResponse)\r
 855     {\r
 856         OIC_LOG_V(INFO, TAG, "StackResult: %d", clientResponse->result);\r
 857         OIC_LOG_V(INFO, TAG,\r
 858                 "Device =============> Discovered @ %s:%d",\r
 859                 clientResponse->devAddr.addr,\r
 860                 clientResponse->devAddr.port);\r
 861 \r
 862         if  (NULL == clientResponse->payload)\r
 863         {\r
 864             OIC_LOG(INFO, TAG, "Skiping Null payload");\r
 865             return OC_STACK_KEEP_TRANSACTION;\r
 866         }\r
 867         if (OC_STACK_OK != clientResponse->result)\r
 868         {\r
 869             OIC_LOG(INFO, TAG, "Error in response");\r
 870             return OC_STACK_KEEP_TRANSACTION;\r
 871         }\r
 872 \r
 873         OIC_LOG_PAYLOAD(INFO, clientResponse->payload);\r
 874         OicSecPconf_t *pconf = NULL;\r
 875 \r
 876         OCStackResult res = CBORPayloadToPconf(\r
 877                 ((OCSecurityPayload*)clientResponse->payload)->securityData,\r
 878                 CBOR_SIZE,&pconf);\r
 879         if (OC_STACK_OK != res )\r
 880         {\r
 881             OIC_LOG(INFO, TAG, "Ignoring malformed CBOR");\r
 882             return OC_STACK_KEEP_TRANSACTION;\r
 883         }\r
 884         else\r
 885         {\r
 886             if(pconf->edp)\r
 887             {\r
 888                 OCDevAddr endpoint;\r
 889                 memcpy(&endpoint, &clientResponse->devAddr, sizeof(OCDevAddr));\r
 890 \r
 891                 OCStackResult res = addDev(&g_dp_discover, &endpoint,\r
 892                             clientResponse->connType, pconf);\r
 893                 DeletePconfBinData(pconf);\r
 894                 if (OC_STACK_OK != res)\r
 895                 {\r
 896                     OIC_LOG(ERROR, TAG, "Error while adding data to linkedlist.");\r
 897                     return OC_STACK_KEEP_TRANSACTION;\r
 898                 }\r
 899 \r
 900 \r
 901                 char rsrc_uri[MAX_URI_LENGTH+1] = {0};\r
 902                 int wr_len = snprintf(rsrc_uri, sizeof(rsrc_uri), "%s?%s=%s",\r
 903                           OC_RSRVD_WELL_KNOWN_URI, OC_RSRVD_RESOURCE_TYPE, OIC_RSRC_TYPE_SEC_DPAIRING);\r
 904                 if(wr_len <= 0 || (size_t)wr_len >= sizeof(rsrc_uri))\r
 905                 {\r
 906                     OIC_LOG(ERROR, TAG, "rsrc_uri_string_print failed");\r
 907                     return OC_STACK_KEEP_TRANSACTION;\r
 908                 }\r
 909 \r
 910                 //Try to the unicast discovery to getting secure port\r
 911                 char query[MAX_URI_LENGTH+MAX_QUERY_LENGTH+1] = {0};\r
 912                 if(!DPGenerateQuery(false,\r
 913                                     clientResponse->devAddr.addr, clientResponse->devAddr.port,\r
 914                                     clientResponse->connType,\r
 915                                     query, sizeof(query), rsrc_uri))\r
 916                 {\r
 917                     OIC_LOG(ERROR, TAG, "DirectPairingDiscoveryHandler : Failed to generate query");\r
 918                     return OC_STACK_KEEP_TRANSACTION;\r
 919                 }\r
 920                 OIC_LOG_V(DEBUG, TAG, "Query=%s", query);\r
 921 \r
 922                 OCCallbackData cbData;\r
 923                 cbData.cb = &DirectPairingPortDiscoveryHandler;\r
 924                 cbData.context = NULL;\r
 925                 cbData.cd = NULL;\r
 926                 OCStackResult ret = OCDoResource(NULL, OC_REST_DISCOVER, query, 0, 0,\r
 927                         clientResponse->connType, OC_LOW_QOS, &cbData, NULL, 0);\r
 928                 if(OC_STACK_OK != ret)\r
 929                 {\r
 930                     OIC_LOG(ERROR, TAG, "Failed to Secure Port Discovery");\r
 931                     return OC_STACK_KEEP_TRANSACTION;\r
 932                 }\r
 933                 else\r
 934                 {\r
 935                     OIC_LOG_V(INFO, TAG, "OCDoResource with [%s] Success", query);\r
 936                 }\r
 937             }\r
 938             return  OC_STACK_KEEP_TRANSACTION;\r
 939         }\r
 940     }\r
 941     else\r
 942     {\r
 943         OIC_LOG(INFO, TAG, "Skiping Null response");\r
 944     }\r
 945 \r
 946     return OC_STACK_DELETE_TRANSACTION;\r
 947 }\r
 948 #ifndef WITH_ARDUINO\r
 949 /**\r
 950  * Discover direct-pairing devices in the same IP subnet. .\r
 951  *\r
 952  * @param[in] waittime  Timeout in seconds.\r
 953  *\r
 954  * @return OC_STACK_OK on success otherwise error.\r
 955  */\r
 956 OCStackResult DPDeviceDiscovery(unsigned short waittime)\r
 957 {\r
 958     OIC_LOG(DEBUG, TAG, "IN DPDeviceDiscovery");\r
 959 \r
 960     if (g_dp_discover)\r
 961     {\r
 962         delList(g_dp_discover);\r
 963         g_dp_discover = NULL;\r
 964     }\r
 965 \r
 966     OCStackResult ret;\r
 967 \r
 968     const char DP_DISCOVERY_QUERY[] = "/oic/sec/pconf";\r
 969 \r
 970     OCCallbackData cbData;\r
 971     cbData.cb = DirectPairingDiscoveryHandler;\r
 972     cbData.context = NULL;\r
 973     cbData.cd = NULL;\r
 974 \r
 975     /* Start a DP discovery query*/\r
 976     OIC_LOG_V(INFO, TAG, "Initiating Direct-Pairing Discovery : %s\n", DP_DISCOVERY_QUERY);\r
 977     OCDoHandle handle = NULL;\r
 978     ret = OCDoResource(&handle, OC_REST_DISCOVER, DP_DISCOVERY_QUERY, 0, 0, CT_DEFAULT,\r
 979                        OC_LOW_QOS, &cbData, NULL, 0);\r
 980     if (ret != OC_STACK_OK)\r
 981     {\r
 982         OIC_LOG(ERROR, TAG, "OCStack resource error");\r
 983         return ret;\r
 984     }\r
 985 \r
 986     // wait..\r
 987 \r
 988     int clock_res = -1;\r
 989 #if defined(_MSC_VER)\r
 990     time_t startTime = NULL;\r
 991     clock_res = (time(&startTime) == -1);\r
 992 #else\r
 993     struct timespec startTime = {.tv_sec=0, .tv_nsec=0};\r
 994 #if defined(__ANDROID__) || _POSIX_TIMERS > 0\r
 995     clock_res = clock_gettime(CLOCK_MONOTONIC, &startTime);\r
 996 #endif\r
 997 #endif\r
 998     if (0 != clock_res)\r
 999     {\r
1000         OIC_LOG(ERROR, TAG, "clock error");\r
1001         if(OC_STACK_OK !=  OCCancel(handle, OC_LOW_QOS, NULL, 0))\r
1002         {\r
1003             OIC_LOG(ERROR, TAG, "Failed to remove registered callback");\r
1004         }\r
1005         return OC_STACK_ERROR;\r
1006     }\r
1007 \r
1008     while (1)\r
1009     {\r
1010 #if defined(_MSC_VER)\r
1011         time_t currTime = NULL;\r
1012         clock_res = (time(&currTime) == -1);\r
1013 #else\r
1014         struct timespec currTime  = {.tv_sec=0, .tv_nsec=0};\r
1015 #if defined(__ANDROID__) || _POSIX_TIMERS > 0\r
1016         clock_res = clock_gettime(CLOCK_MONOTONIC, &currTime);\r
1017 #endif\r
1018 #endif\r
1019         if (0 != clock_res)\r
1020         {\r
1021             OIC_LOG(ERROR, TAG, "clock error");\r
1022             ret = OC_STACK_ERROR;\r
1023             break;\r
1024         }\r
1025 #if defined(_MSC_VER)\r
1026         long elapsed = currTime - startTime;\r
1027 #else\r
1028         long elapsed = (currTime.tv_sec - startTime.tv_sec);\r
1029 #endif\r
1030         if (elapsed > waittime)\r
1031         {\r
1032             break;\r
1033         }\r
1034         else\r
1035         {\r
1036             struct timespec timeout = {.tv_sec=0, .tv_nsec=100000000L};\r
1037             OCProcess();\r
1038             nanosleep(&timeout, NULL);\r
1039         }\r
1040     }\r
1041 \r
1042     // Waiting for each response.\r
1043     ret = OCCancel(handle, OC_LOW_QOS, NULL, 0);\r
1044     if (OC_STACK_OK != ret)\r
1045     {\r
1046         OIC_LOG(ERROR, TAG, "Failed to remove registered callback");\r
1047     }\r
1048     OIC_LOG(DEBUG, TAG, "OUT DPDeviceDiscovery");\r
1049     return ret;\r
1050 }\r
1051 #endif\r