resource/csdk/connectivity/src/tcp_adapter/catcpadapter.c

   1 /* ****************************************************************
   2  *
   3  * Copyright 2015 Samsung Electronics 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 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdint.h>
  25
  26 #ifndef __STDC_FORMAT_MACROS
  27 #define __STDC_FORMAT_MACROS
  28 #endif
  29 #include <inttypes.h>
  30
  31 #include "cainterface.h"
  32 #include "caipnwmonitor.h"
  33 #include "catcpadapter.h"
  34 #include "catcpinterface.h"
  35 #include "caqueueingthread.h"
  36 #include "caadapterutils.h"
  37 #include "octhread.h"
  38 #include "uarraylist.h"
  39 #include "caremotehandler.h"
  40 #include "logger.h"
  41 #include "oic_malloc.h"
  42 #ifdef __WITH_TLS__
  43 #include "ca_adapter_net_ssl.h"
  44 #endif
  45
  46 /**
  47  * Logging tag for module name.
  48  */
  49 #define TAG "OIC_CA_TCP_ADAP"
  50
  51 /**
  52  * Holds internal thread TCP data information.
  53  */
  54 typedef struct
  55 {
  56     CAEndpoint_t *remoteEndpoint;
  57     void *data;
  58     size_t dataLen;
  59     bool isMulticast;
  60 } CATCPData;
  61
  62 #define CA_TCP_LISTEN_BACKLOG  3
  63
  64 #define CA_TCP_SELECT_TIMEOUT 10
  65
  66 /**
  67  * Queue handle for Send Data.
  68  */
  69 static CAQueueingThread_t *g_sendQueueHandle = NULL;
  70
  71 /**
  72  * Network Packet Received Callback to CA.
  73  */
  74 static CANetworkPacketReceivedCallback g_networkPacketCallback = NULL;
  75
  76 /**
  77  * Adapter Changed Callback to CA.
  78  */
  79 static CAAdapterChangeCallback g_networkChangeCallback = NULL;
  80
  81 /**
  82  * Connection Changed Callback to CA.
  83  */
  84 static CAConnectionChangeCallback g_connectionChangeCallback = NULL;
  85
  86 /**
  87  * error Callback to CA adapter.
  88  */
  89 static CAErrorHandleCallback g_errorCallback = NULL;
  90
  91 /**
  92  * KeepAlive Connected or Disconnected Callback to CA adapter.
  93  */
  94 static CAKeepAliveConnectionCallback g_connKeepAliveCallback = NULL;
  95
  96 static CAResult_t CATCPPacketReceivedCB(const CASecureEndpoint_t *sep,
  97                                         const void *data, uint32_t dataLength);
  98
  99 static void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
 100                               size_t dataLength, CAResult_t result);
 101
 102 static CAResult_t CATCPInitializeQueueHandles();
 103
 104 static void CATCPDeinitializeQueueHandles();
 105
 106 static void CATCPSendDataThread(void *threadData);
 107
 108 static CATCPData *CACreateTCPData(const CAEndpoint_t *remoteEndpoint,
 109                                   const void *data, size_t dataLength,
 110                                   bool isMulticast);
 111 void CAFreeTCPData(CATCPData *ipData);
 112
 113 static void CADataDestroyer(void *data, uint32_t size);
 114
 115 CAResult_t CATCPInitializeQueueHandles()
 116 {
 117     // Check if the message queue is already initialized
 118     if (g_sendQueueHandle)
 119     {
 120         OIC_LOG(DEBUG, TAG, "send queue handle is already initialized!");
 121         return CA_STATUS_OK;
 122     }
 123
 124     // Create send message queue
 125     g_sendQueueHandle = OICMalloc(sizeof(CAQueueingThread_t));
 126     if (!g_sendQueueHandle)
 127     {
 128         OIC_LOG(ERROR, TAG, "Memory allocation failed!");
 129         return CA_MEMORY_ALLOC_FAILED;
 130     }
 131
 132     if (CA_STATUS_OK != CAQueueingThreadInitialize(g_sendQueueHandle,
 133                                 (const ca_thread_pool_t)caglobals.tcp.threadpool,
 134                                 CATCPSendDataThread, CADataDestroyer))
 135     {
 136         OIC_LOG(ERROR, TAG, "Failed to Initialize send queue thread");
 137         OICFree(g_sendQueueHandle);
 138         g_sendQueueHandle = NULL;
 139         return CA_STATUS_FAILED;
 140     }
 141
 142     return CA_STATUS_OK;
 143 }
 144
 145 void CATCPDeinitializeQueueHandles()
 146 {
 147     CAQueueingThreadDestroy(g_sendQueueHandle);
 148     OICFree(g_sendQueueHandle);
 149     g_sendQueueHandle = NULL;
 150 }
 151
 152 void CATCPConnectionStateCB(const char *ipAddress, CANetworkStatus_t status)
 153 {
 154     (void)ipAddress;
 155     (void)status;
 156 }
 157
 158 CAResult_t CATCPPacketReceivedCB(const CASecureEndpoint_t *sep, const void *data,
 159                                  uint32_t dataLength)
 160 {
 161     VERIFY_NON_NULL(sep, TAG, "sep is NULL");
 162     VERIFY_NON_NULL(data, TAG, "data is NULL");
 163
 164     OIC_LOG_V(DEBUG, TAG, "Address: %s, port:%d", sep->endpoint.addr, sep->endpoint.port);
 165
 166     CAResult_t res = CA_STATUS_OK;
 167 #ifdef SINGLE_THREAD
 168     if (g_networkPacketCallback)
 169     {
 170         res = g_networkPacketCallback(sep, data, dataLength);
 171         if (CA_STATUS_OK != res)
 172         {
 173             OIC_LOG(ERROR, TAG, "Error parsing CoAP data");
 174         }
 175     }
 176 #else
 177     unsigned char *buffer = (unsigned char*)data;
 178     size_t bufferLen = dataLength;
 179     size_t index = 0;
 180
 181     //get remote device information from file descriptor.
 182     CATCPSessionInfo_t *svritem = CAGetTCPSessionInfoFromEndpoint(&sep->endpoint, &index);
 183     if (!svritem)
 184     {
 185         OIC_LOG(ERROR, TAG, "there is no connection information in list");
 186         return CA_STATUS_INVALID_PARAM;
 187     }
 188     if (UNKNOWN == svritem->protocol)
 189     {
 190         OIC_LOG(ERROR, TAG, "invalid protocol type");
 191         return CA_STATUS_INVALID_PARAM;
 192     }
 193
 194     //totalLen filled only when header fully read and parsed
 195     while (0 != bufferLen)
 196     {
 197         res = CAConstructCoAP(svritem, &buffer, &bufferLen);
 198         if (CA_STATUS_OK != res)
 199         {
 200             OIC_LOG_V(ERROR, TAG, "CAConstructCoAP return error : %d", res);
 201             return res;
 202         }
 203
 204         //when successfully read all required data - pass them to upper layer.
 205         if (svritem->len == svritem->totalLen)
 206         {
 207             if (g_networkPacketCallback)
 208             {
 209                 res = g_networkPacketCallback(sep, svritem->data, svritem->totalLen);
 210                 if (CA_STATUS_OK != res)
 211                 {
 212                     OIC_LOG(ERROR, TAG, "Error parsing CoAP data");
 213                     return res;
 214                 }
 215             }
 216             CACleanData(svritem);
 217         }
 218         else
 219         {
 220             OIC_LOG_V(DEBUG, TAG, "%u bytes required for complete CoAP",
 221                                 svritem->totalLen - svritem->len);
 222         }
 223     }
 224 #endif
 225     return res;
 226 }
 227
 228 #ifdef __WITH_TLS__
 229 static ssize_t CATCPPacketSendCB(CAEndpoint_t *endpoint, const void *data, size_t dataLength)
 230 {
 231     OIC_LOG_V(DEBUG, TAG, "In %s", __func__);
 232     VERIFY_NON_NULL_RET(endpoint, TAG, "endpoint is NULL", -1);
 233     VERIFY_NON_NULL_RET(data, TAG, "data is NULL", -1);
 234
 235     OIC_LOG_V(DEBUG, TAG, "Address: %s, port:%d", endpoint->addr, endpoint->port);
 236     OIC_LOG_BUFFER(DEBUG, TAG, data, dataLength);
 237
 238     ssize_t ret = CATCPSendData(endpoint, data, dataLength);
 239     OIC_LOG_V(DEBUG, TAG, "Out %s : %d bytes sent", __func__, ret);
 240     return ret;
 241 }
 242 #endif
 243
 244 static void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
 245                               size_t dataLength, CAResult_t result)
 246 {
 247     VERIFY_NON_NULL_VOID(endpoint, TAG, "endpoint is NULL");
 248     VERIFY_NON_NULL_VOID(data, TAG, "data is NULL");
 249
 250     if (g_errorCallback)
 251     {
 252         g_errorCallback(endpoint, data, dataLength, result);
 253     }
 254 }
 255
 256 static void CATCPConnectionHandler(const CAEndpoint_t *endpoint, bool isConnected, bool isClient)
 257 {
 258     // Pass the changed connection status to RI Layer for keepalive.
 259     if (g_connKeepAliveCallback)
 260     {
 261         g_connKeepAliveCallback(endpoint, isConnected, isClient);
 262     }
 263
 264     // Pass the changed connection status to CAUtil.
 265     if (g_connectionChangeCallback)
 266     {
 267         g_connectionChangeCallback(endpoint, isConnected);
 268     }
 269 }
 270
 271 void CATCPSetKeepAliveCallbacks(CAKeepAliveConnectionCallback ConnHandler)
 272 {
 273     g_connKeepAliveCallback = ConnHandler;
 274 }
 275
 276 void CATCPAdapterHandler(CATransportAdapter_t adapter, CANetworkStatus_t status)
 277 {
 278     if (g_networkChangeCallback)
 279     {
 280         g_networkChangeCallback(adapter, status);
 281     }
 282
 283     if (CA_INTERFACE_DOWN == status)
 284     {
 285         OIC_LOG(INFO, TAG, "Network status is down, close all session");
 286
 287         CAResult_t res = CAQueueingThreadClearData(g_sendQueueHandle);
 288         if (res != CA_STATUS_OK)
 289         {
 290             OIC_LOG_V(ERROR, TAG, "CAQueueingThreadClearData failed[%d]", res);
 291         }
 292
 293         CATCPStopServer();
 294     }
 295     else if (CA_INTERFACE_UP == status)
 296     {
 297         OIC_LOG(INFO, TAG, "Network status is up, create new socket for listening");
 298
 299         CAResult_t ret = CA_STATUS_FAILED;
 300 #ifndef SINGLE_THREAD
 301         ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
 302 #else
 303         ret = CATCPStartServer();
 304 #endif
 305         if (CA_STATUS_OK != ret)
 306         {
 307             OIC_LOG_V(ERROR, TAG, "CATCPStartServer failed[%d]", ret);
 308         }
 309     }
 310 }
 311
 312 static void CAInitializeTCPGlobals()
 313 {
 314     caglobals.tcp.ipv4.fd = -1;
 315     caglobals.tcp.ipv4s.fd = -1;
 316     caglobals.tcp.ipv6.fd = -1;
 317     caglobals.tcp.ipv6s.fd = -1;
 318
 319     // Set the port number received from application.
 320     caglobals.tcp.ipv4.port = caglobals.ports.tcp.u4;
 321     caglobals.tcp.ipv4s.port = caglobals.ports.tcp.u4s;
 322     caglobals.tcp.ipv6.port = caglobals.ports.tcp.u6;
 323     caglobals.tcp.ipv6s.port = caglobals.ports.tcp.u6s;
 324
 325     caglobals.tcp.selectTimeout = CA_TCP_SELECT_TIMEOUT;
 326     caglobals.tcp.listenBacklog = CA_TCP_LISTEN_BACKLOG;
 327     caglobals.tcp.svrlist = NULL;
 328
 329     CATransportFlags_t flags = 0;
 330     if (caglobals.client)
 331     {
 332         flags |= caglobals.clientFlags;
 333     }
 334     if (caglobals.server)
 335     {
 336         flags |= caglobals.serverFlags;
 337     }
 338
 339     caglobals.tcp.ipv4tcpenabled = flags & CA_IPV4;
 340     caglobals.tcp.ipv6tcpenabled = flags & CA_IPV6;
 341 }
 342
 343 CAResult_t CAInitializeTCP(CARegisterConnectivityCallback registerCallback,
 344                            CANetworkPacketReceivedCallback networkPacketCallback,
 345                            CAAdapterChangeCallback netCallback,
 346                            CAConnectionChangeCallback connCallback,
 347                            CAErrorHandleCallback errorCallback, ca_thread_pool_t handle)
 348 {
 349     OIC_LOG(DEBUG, TAG, "IN");
 350     VERIFY_NON_NULL(registerCallback, TAG, "registerCallback");
 351     VERIFY_NON_NULL(networkPacketCallback, TAG, "networkPacketCallback");
 352     VERIFY_NON_NULL(netCallback, TAG, "netCallback");
 353 #ifndef SINGLE_THREAD
 354     VERIFY_NON_NULL(handle, TAG, "thread pool handle");
 355 #endif
 356
 357     g_networkChangeCallback = netCallback;
 358     g_connectionChangeCallback = connCallback;
 359     g_networkPacketCallback = networkPacketCallback;
 360     g_errorCallback = errorCallback;
 361
 362     CAInitializeTCPGlobals();
 363
 364     CAResult_t res = CATCPCreateMutex();
 365     if (CA_STATUS_OK == res)
 366     {
 367         res = CATCPCreateCond();
 368     }
 369     if (CA_STATUS_OK != res)
 370     {
 371         OIC_LOG(ERROR, TAG, "failed to create mutex/cond");
 372         CATCPDestroyMutex();
 373         CATCPDestroyCond();
 374         return res;
 375     }
 376
 377 #ifndef SINGLE_THREAD
 378     caglobals.tcp.threadpool = handle;
 379 #endif
 380
 381     CATCPSetConnectionChangedCallback(CATCPConnectionHandler);
 382     CATCPSetPacketReceiveCallback(CATCPPacketReceivedCB);
 383     CATCPSetErrorHandler(CATCPErrorHandler);
 384
 385 #ifdef __WITH_TLS__
 386     CAsetSslAdapterCallbacks(CATCPPacketReceivedCB, CATCPPacketSendCB, CA_ADAPTER_TCP);
 387 #endif
 388
 389     CAConnectivityHandler_t tcpHandler = {
 390         .startAdapter = CAStartTCP,
 391         .startListenServer = CAStartTCPListeningServer,
 392         .stopListenServer = CAStopTCPListeningServer,
 393         .startDiscoveryServer = CAStartTCPDiscoveryServer,
 394         .sendData = CASendTCPUnicastData,
 395         .sendDataToAll = CASendTCPMulticastData,
 396         .GetnetInfo = CAGetTCPInterfaceInformation,
 397         .readData = CAReadTCPData,
 398         .stopAdapter = CAStopTCP,
 399         .terminate = CATerminateTCP,
 400         .cType = CA_ADAPTER_TCP};
 401
 402     registerCallback(tcpHandler);
 403
 404     OIC_LOG(INFO, TAG, "OUT IntializeTCP is Success");
 405     return CA_STATUS_OK;
 406 }
 407
 408 CAResult_t CAStartTCP()
 409 {
 410     OIC_LOG(DEBUG, TAG, "IN");
 411
 412 #ifndef SINGLE_THREAD
 413     if (CA_STATUS_OK != CATCPInitializeQueueHandles())
 414     {
 415         OIC_LOG(ERROR, TAG, "Failed to Initialize Queue Handle");
 416         CATerminateTCP();
 417         return CA_STATUS_FAILED;
 418     }
 419
 420     // Start send queue thread
 421 #ifndef __TIZENRT__
 422     if (CA_STATUS_OK != CAQueueingThreadStart(g_sendQueueHandle))
 423 #else
 424     if (CA_STATUS_OK != CAQueueingThreadStart(g_sendQueueHandle, "IoT_TCPSendQueue"))
 425 #endif
 426     {
 427         OIC_LOG(ERROR, TAG, "Failed to Start Send Data Thread");
 428         return CA_STATUS_FAILED;
 429     }
 430 #else
 431     CAResult_t ret = CATCPStartServer();
 432     if (CA_STATUS_OK != ret)
 433     {
 434         OIC_LOG_V(DEBUG, TAG, "CATCPStartServer failed[%d]", ret);
 435         return ret;
 436     }
 437 #endif
 438
 439     // Start network monitoring to receive adapter status changes.
 440     CAIPStartNetworkMonitor(CATCPAdapterHandler, CA_ADAPTER_TCP);
 441
 442     return CA_STATUS_OK;
 443 }
 444
 445 static bool CAClearQueueEndpointDataContext(void *data, uint32_t size, void *ctx)
 446 {
 447     if (NULL == data || NULL == ctx)
 448     {
 449         return false;
 450     }
 451
 452     CATCPData *tcpData = (CATCPData *)data;
 453     CAEndpoint_t *endpoint = (CAEndpoint_t *)ctx;
 454
 455     if (NULL != tcpData && NULL != tcpData->remoteEndpoint)
 456     {
 457         if (strcmp(tcpData->remoteEndpoint->addr, endpoint->addr) == 0
 458             && tcpData->remoteEndpoint->port == endpoint->port)
 459         {
 460             return true;
 461         }
 462     }
 463     return false;
 464 }
 465
 466 CAResult_t CATCPDisconnectSession(const CAEndpoint_t *endpoint)
 467 {
 468     CAResult_t res = CA_STATUS_OK;
 469 #ifdef __WITH_TLS__
 470     res = CAcloseSslConnection(endpoint);
 471     if (CA_STATUS_OK != res)
 472     {
 473         OIC_LOG(ERROR, TAG, "failed to close TLS session");
 474         return res;
 475     }
 476 #endif
 477     res = CASearchAndDeleteTCPSession(endpoint);
 478     if (CA_STATUS_OK != res)
 479     {
 480         OIC_LOG(ERROR, TAG, "failed to close TCP session");
 481     }
 482     res = CAQueueingThreadClearContextData(g_sendQueueHandle,
 483                                            CAClearQueueEndpointDataContext,
 484                                            endpoint);
 485     return res;
 486 }
 487
 488 CAResult_t CAStartTCPListeningServer()
 489 {
 490 #ifndef SINGLE_THREAD
 491     if (!caglobals.server)
 492     {
 493         caglobals.server = true;    // only needed to run CA tests
 494     }
 495
 496     CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
 497     if (CA_STATUS_OK != ret)
 498     {
 499         OIC_LOG_V(ERROR, TAG, "Failed to start listening server![%d]", ret);
 500         return ret;
 501     }
 502 #endif
 503
 504     return CA_STATUS_OK;
 505 }
 506
 507 CAResult_t CAStopTCPListeningServer()
 508 {
 509     return CA_STATUS_OK;
 510 }
 511
 512 CAResult_t CAStartTCPDiscoveryServer()
 513 {
 514     if (!caglobals.client)
 515     {
 516         caglobals.client = true;    // only needed to run CA tests
 517     }
 518
 519     CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
 520     if (CA_STATUS_OK != ret)
 521     {
 522         OIC_LOG_V(ERROR, TAG, "Failed to start discovery server![%d]", ret);
 523         return ret;
 524     }
 525
 526     return CA_STATUS_OK;
 527 }
 528
 529 static size_t CAQueueTCPData(bool isMulticast, const CAEndpoint_t *endpoint,
 530                              const void *data, size_t dataLength)
 531 {
 532     VERIFY_NON_NULL_RET(endpoint, TAG, "endpoint", -1);
 533     VERIFY_NON_NULL_RET(data, TAG, "data", -1);
 534
 535     if (0 == dataLength)
 536     {
 537         OIC_LOG(ERROR, TAG, "Invalid Data Length");
 538         return -1;
 539     }
 540
 541     VERIFY_NON_NULL_RET(g_sendQueueHandle, TAG, "sendQueueHandle", -1);
 542
 543     // Create TCPData to add to queue
 544     CATCPData *tcpData = CACreateTCPData(endpoint, data, dataLength, isMulticast);
 545     if (!tcpData)
 546     {
 547         OIC_LOG(ERROR, TAG, "Failed to create ipData!");
 548         return -1;
 549     }
 550     // Add message to send queue
 551     CAQueueingThreadAddData(g_sendQueueHandle, tcpData, sizeof(CATCPData));
 552
 553     return dataLength;
 554 }
 555
 556 int32_t CASendTCPUnicastData(const CAEndpoint_t *endpoint,
 557                              const void *data, uint32_t dataLength,
 558                              CADataType_t dataType)
 559 {
 560     OIC_LOG(DEBUG, TAG, "IN");
 561     (void)dataType;
 562 #ifndef SINGLE_THREAD
 563     return CAQueueTCPData(false, endpoint, data, dataLength);
 564 #else
 565     return CATCPSendData(endpoint, data, dataLength);
 566 #endif
 567 }
 568
 569 int32_t CASendTCPMulticastData(const CAEndpoint_t *endpoint,
 570                                const void *data, uint32_t dataLength,
 571                                CADataType_t dataType)
 572 {
 573     (void)dataType;
 574     return CAQueueTCPData(true, endpoint, data, dataLength);
 575 }
 576
 577 CAResult_t CAReadTCPData()
 578 {
 579     OIC_LOG(DEBUG, TAG, "IN");
 580 #ifdef SINGLE_THREAD
 581     CATCPPullData();
 582 #endif
 583     return CA_STATUS_OK;
 584 }
 585
 586 CAResult_t CAStopTCP()
 587 {
 588     CAIPStopNetworkMonitor(CA_ADAPTER_TCP);
 589
 590 #ifndef SINGLE_THREAD
 591     if (g_sendQueueHandle && g_sendQueueHandle->threadMutex)
 592     {
 593         CAQueueingThreadStop(g_sendQueueHandle);
 594     }
 595     CATCPDeinitializeQueueHandles();
 596 #endif
 597
 598     CATCPStopServer();
 599
 600     //Re-initializing the Globals to start them again
 601     CAInitializeTCPGlobals();
 602
 603     return CA_STATUS_OK;
 604 }
 605
 606 void CATerminateTCP()
 607 {
 608     CATCPSetPacketReceiveCallback(NULL);
 609
 610     CATCPDestroyMutex();
 611     CATCPDestroyCond();
 612 }
 613
 614 void CATCPSendDataThread(void *threadData)
 615 {
 616     CATCPData *tcpData = (CATCPData *) threadData;
 617     if (!tcpData)
 618     {
 619         OIC_LOG(DEBUG, TAG, "Invalid TCP data!");
 620         return;
 621     }
 622
 623     if (caglobals.tcp.terminate)
 624     {
 625         OIC_LOG(DEBUG, TAG, "Adapter is not enabled");
 626         CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 627                           CA_SEND_FAILED);
 628         return;
 629     }
 630
 631     if (tcpData->isMulticast)
 632     {
 633         //Processing for sending multicast
 634         OIC_LOG(DEBUG, TAG, "Send Multicast Data is called, not supported");
 635         return;
 636     }
 637     else
 638     {
 639 #ifdef __WITH_TLS__
 640         if (tcpData->remoteEndpoint && tcpData->remoteEndpoint->flags & CA_SECURE)
 641         {
 642             CAResult_t result = CA_STATUS_OK;
 643             OIC_LOG(DEBUG, TAG, "CAencryptSsl called!");
 644             result = CAencryptSsl(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
 645
 646             if (CA_STATUS_OK != result)
 647             {
 648                 OIC_LOG(ERROR, TAG, "CAAdapterNetDtlsEncrypt failed!");
 649                 CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
 650                 CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 651                                   CA_SEND_FAILED);
 652             }
 653             OIC_LOG_V(DEBUG, TAG,
 654                       "CAAdapterNetDtlsEncrypt returned with result[%d]", result);
 655             return;
 656         }
 657 #endif
 658         //Processing for sending unicast
 659          ssize_t dlen = CATCPSendData(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
 660          if (-1 == dlen)
 661          {
 662              OIC_LOG(ERROR, TAG, "CATCPSendData failed");
 663              CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
 664              CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 665                                CA_SEND_FAILED);
 666          }
 667     }
 668 }
 669
 670 CATCPData *CACreateTCPData(const CAEndpoint_t *remoteEndpoint, const void *data,
 671                            size_t dataLength, bool isMulticast)
 672 {
 673     VERIFY_NON_NULL_RET(remoteEndpoint, TAG, "remoteEndpoint is NULL", NULL);
 674     VERIFY_NON_NULL_RET(data, TAG, "data is NULL", NULL);
 675
 676     CATCPData *tcpData = (CATCPData *) OICCalloc(1, sizeof(*tcpData));
 677     if (!tcpData)
 678     {
 679         OIC_LOG(ERROR, TAG, "Memory allocation failed!");
 680         return NULL;
 681     }
 682
 683     tcpData->remoteEndpoint = CACloneEndpoint(remoteEndpoint);
 684     tcpData->data = (void *) OICMalloc(dataLength);
 685     if (!tcpData->data)
 686     {
 687         OIC_LOG(ERROR, TAG, "Memory allocation failed!");
 688         CAFreeTCPData(tcpData);
 689         return NULL;
 690     }
 691
 692     memcpy(tcpData->data, data, dataLength);
 693     tcpData->dataLen = dataLength;
 694
 695     tcpData->isMulticast = isMulticast;
 696
 697     return tcpData;
 698 }
 699
 700 void CAFreeTCPData(CATCPData *tcpData)
 701 {
 702     VERIFY_NON_NULL_VOID(tcpData, TAG, "tcpData is NULL");
 703
 704     CAFreeEndpoint(tcpData->remoteEndpoint);
 705     OICFree(tcpData->data);
 706     OICFree(tcpData);
 707 }
 708
 709 void CADataDestroyer(void *data, uint32_t size)
 710 {
 711     if (size < sizeof(CATCPData))
 712     {
 713 #ifndef __TIZENRT__
 714         OIC_LOG_V(ERROR, TAG, "Destroy data too small %p %" PRIu32, data, size);
 715 #endif
 716     }
 717     CATCPData *TCPData = (CATCPData *) data;
 718
 719     CAFreeTCPData(TCPData);
 720 }
 721
 722 #ifdef SINGLE_THREAD
 723 size_t CAGetTotalLengthFromPacketHeader(const unsigned char *recvBuffer, size_t size)
 724 {
 725     OIC_LOG(DEBUG, TAG, "IN - CAGetTotalLengthFromHeader");
 726
 727     if (NULL == recvBuffer || !size)
 728     {
 729         OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
 730         return 0;
 731     }
 732
 733     coap_transport_t transport = coap_get_tcp_header_type_from_initbyte(
 734             ((unsigned char *)recvBuffer)[0] >> 4);
 735     size_t optPaylaodLen = coap_get_length_from_header((unsigned char *)recvBuffer,
 736                                                         transport);
 737     size_t headerLen = coap_get_tcp_header_length((unsigned char *)recvBuffer);
 738
 739     OIC_LOG_V(DEBUG, TAG, "option/paylaod length [%d]", optPaylaodLen);
 740     OIC_LOG_V(DEBUG, TAG, "header length [%d]", headerLen);
 741     OIC_LOG_V(DEBUG, TAG, "total data length [%d]", headerLen + optPaylaodLen);
 742
 743     OIC_LOG(DEBUG, TAG, "OUT - CAGetTotalLengthFromHeader");
 744     return headerLen + optPaylaodLen;
 745 }
 746
 747 void CAGetTCPHeaderDetails(unsigned char* recvBuffer, coap_transport_t *transport,
 748                            size_t *headerlen)
 749 {
 750     if (NULL == recvBuffer)
 751     {
 752         OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
 753         return;
 754     }
 755
 756     if (NULL == transport)
 757     {
 758         OIC_LOG(ERROR, TAG, "transport is NULL");
 759         return;
 760     }
 761
 762     if (NULL == headerlen)
 763     {
 764         OIC_LOG(ERROR, TAG, "headerlen is NULL");
 765         return;
 766     }
 767
 768     *transport = coap_get_tcp_header_type_from_initbyte(
 769         ((unsigned char *)recvBuffer)[0] >> 4);
 770     *headerlen = coap_get_tcp_header_length_for_transport(*transport);
 771 }
 772 #endif