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     (void)size;
 448
 449     if (NULL == data || NULL == ctx)
 450     {
 451         return false;
 452     }
 453
 454     CATCPData *tcpData = (CATCPData *)data;
 455     CAEndpoint_t *endpoint = (CAEndpoint_t *)ctx;
 456
 457     if (NULL != tcpData && NULL != tcpData->remoteEndpoint)
 458     {
 459         if (strcmp(tcpData->remoteEndpoint->addr, endpoint->addr) == 0
 460             && tcpData->remoteEndpoint->port == endpoint->port)
 461         {
 462             return true;
 463         }
 464     }
 465     return false;
 466 }
 467
 468 CAResult_t CATCPDisconnectSession(const CAEndpoint_t *endpoint)
 469 {
 470     CAResult_t res = CAQueueingThreadClearContextData(g_sendQueueHandle,
 471                                                       CAClearQueueEndpointDataContext,
 472                                                       endpoint);
 473     if (CA_STATUS_OK != res)
 474     {
 475         OIC_LOG(ERROR, TAG, "failed to clear context data");
 476     }
 477
 478 #ifdef __WITH_TLS__
 479     res = CAcloseSslConnection(endpoint);
 480     if (CA_STATUS_OK != res)
 481     {
 482         OIC_LOG(ERROR, TAG, "failed to close TLS session");
 483     }
 484 #endif
 485
 486     res = CASearchAndDeleteTCPSession(endpoint);
 487     if (CA_STATUS_OK != res)
 488     {
 489         OIC_LOG(ERROR, TAG, "failed to close TCP session");
 490     }
 491
 492     return res;
 493 }
 494
 495 CAResult_t CAStartTCPListeningServer()
 496 {
 497 #ifndef SINGLE_THREAD
 498     if (!caglobals.server)
 499     {
 500         caglobals.server = true;    // only needed to run CA tests
 501     }
 502
 503     CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
 504     if (CA_STATUS_OK != ret)
 505     {
 506         OIC_LOG_V(ERROR, TAG, "Failed to start listening server![%d]", ret);
 507         return ret;
 508     }
 509 #endif
 510
 511     return CA_STATUS_OK;
 512 }
 513
 514 CAResult_t CAStopTCPListeningServer()
 515 {
 516     return CA_STATUS_OK;
 517 }
 518
 519 CAResult_t CAStartTCPDiscoveryServer()
 520 {
 521     if (!caglobals.client)
 522     {
 523         caglobals.client = true;    // only needed to run CA tests
 524     }
 525
 526     CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
 527     if (CA_STATUS_OK != ret)
 528     {
 529         OIC_LOG_V(ERROR, TAG, "Failed to start discovery server![%d]", ret);
 530         return ret;
 531     }
 532
 533     return CA_STATUS_OK;
 534 }
 535
 536 static size_t CAQueueTCPData(bool isMulticast, const CAEndpoint_t *endpoint,
 537                              const void *data, size_t dataLength)
 538 {
 539     VERIFY_NON_NULL_RET(endpoint, TAG, "endpoint", -1);
 540     VERIFY_NON_NULL_RET(data, TAG, "data", -1);
 541
 542     if (0 == dataLength)
 543     {
 544         OIC_LOG(ERROR, TAG, "Invalid Data Length");
 545         return -1;
 546     }
 547
 548     VERIFY_NON_NULL_RET(g_sendQueueHandle, TAG, "sendQueueHandle", -1);
 549
 550     // Create TCPData to add to queue
 551     CATCPData *tcpData = CACreateTCPData(endpoint, data, dataLength, isMulticast);
 552     if (!tcpData)
 553     {
 554         OIC_LOG(ERROR, TAG, "Failed to create ipData!");
 555         return -1;
 556     }
 557     // Add message to send queue
 558     CAQueueingThreadAddData(g_sendQueueHandle, tcpData, sizeof(CATCPData));
 559
 560     return dataLength;
 561 }
 562
 563 int32_t CASendTCPUnicastData(const CAEndpoint_t *endpoint,
 564                              const void *data, uint32_t dataLength,
 565                              CADataType_t dataType)
 566 {
 567     OIC_LOG(DEBUG, TAG, "IN");
 568     (void)dataType;
 569 #ifndef SINGLE_THREAD
 570     return CAQueueTCPData(false, endpoint, data, dataLength);
 571 #else
 572     return CATCPSendData(endpoint, data, dataLength);
 573 #endif
 574 }
 575
 576 int32_t CASendTCPMulticastData(const CAEndpoint_t *endpoint,
 577                                const void *data, uint32_t dataLength,
 578                                CADataType_t dataType)
 579 {
 580     (void)dataType;
 581     return CAQueueTCPData(true, endpoint, data, dataLength);
 582 }
 583
 584 CAResult_t CAReadTCPData()
 585 {
 586     OIC_LOG(DEBUG, TAG, "IN");
 587 #ifdef SINGLE_THREAD
 588     CATCPPullData();
 589 #endif
 590     return CA_STATUS_OK;
 591 }
 592
 593 CAResult_t CAStopTCP()
 594 {
 595     CAIPStopNetworkMonitor(CA_ADAPTER_TCP);
 596
 597     /* Some times send queue thread fails to terminate as it's worker
 598        thread gets blocked at TCP session's socket connect operation.
 599        So closing sockets which are in connect operation at the time
 600        of termination of adapter would save send queue thread from
 601        getting blocked. */
 602     CATCPCloseInProgressConnections();
 603
 604 #ifndef SINGLE_THREAD
 605     // Stop send queue thread.
 606     if (g_sendQueueHandle && g_sendQueueHandle->threadMutex)
 607     {
 608         CAQueueingThreadStop(g_sendQueueHandle);
 609     }
 610     CATCPDeinitializeQueueHandles();
 611 #endif
 612
 613     // Close TCP servers and established connections.
 614     CATCPStopServer();
 615
 616     // Re-initializing the Globals to start them again.
 617     CAInitializeTCPGlobals();
 618
 619     return CA_STATUS_OK;
 620 }
 621
 622 void CATerminateTCP()
 623 {
 624     CATCPSetPacketReceiveCallback(NULL);
 625
 626     CATCPDestroyMutex();
 627     CATCPDestroyCond();
 628 }
 629
 630 void CATCPSendDataThread(void *threadData)
 631 {
 632     CATCPData *tcpData = (CATCPData *) threadData;
 633     if (!tcpData)
 634     {
 635         OIC_LOG(DEBUG, TAG, "Invalid TCP data!");
 636         return;
 637     }
 638
 639     if (caglobals.tcp.terminate)
 640     {
 641         OIC_LOG(DEBUG, TAG, "Adapter is not enabled");
 642         CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 643                           CA_SEND_FAILED);
 644         return;
 645     }
 646
 647     if (tcpData->isMulticast)
 648     {
 649         //Processing for sending multicast
 650         OIC_LOG(DEBUG, TAG, "Send Multicast Data is called, not supported");
 651         return;
 652     }
 653     else
 654     {
 655 #ifdef __WITH_TLS__
 656         if (tcpData->remoteEndpoint && tcpData->remoteEndpoint->flags & CA_SECURE)
 657         {
 658             CAResult_t result = CA_STATUS_OK;
 659             OIC_LOG(DEBUG, TAG, "CAencryptSsl called!");
 660             result = CAencryptSsl(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
 661
 662             if (CA_STATUS_OK != result)
 663             {
 664                 OIC_LOG(ERROR, TAG, "CAAdapterNetDtlsEncrypt failed!");
 665                 CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
 666                 CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 667                                   CA_SEND_FAILED);
 668             }
 669             OIC_LOG_V(DEBUG, TAG,
 670                       "CAAdapterNetDtlsEncrypt returned with result[%d]", result);
 671             return;
 672         }
 673 #endif
 674         //Processing for sending unicast
 675          ssize_t dlen = CATCPSendData(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
 676          if (-1 == dlen)
 677          {
 678              OIC_LOG(ERROR, TAG, "CATCPSendData failed");
 679              CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
 680              CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
 681                                CA_SEND_FAILED);
 682          }
 683     }
 684 }
 685
 686 CATCPData *CACreateTCPData(const CAEndpoint_t *remoteEndpoint, const void *data,
 687                            size_t dataLength, bool isMulticast)
 688 {
 689     VERIFY_NON_NULL_RET(remoteEndpoint, TAG, "remoteEndpoint is NULL", NULL);
 690     VERIFY_NON_NULL_RET(data, TAG, "data is NULL", NULL);
 691
 692     CATCPData *tcpData = (CATCPData *) OICCalloc(1, sizeof(*tcpData));
 693     if (!tcpData)
 694     {
 695         OIC_LOG(ERROR, TAG, "Memory allocation failed!");
 696         return NULL;
 697     }
 698
 699     tcpData->remoteEndpoint = CACloneEndpoint(remoteEndpoint);
 700     tcpData->data = (void *) OICMalloc(dataLength);
 701     if (!tcpData->data)
 702     {
 703         OIC_LOG(ERROR, TAG, "Memory allocation failed!");
 704         CAFreeTCPData(tcpData);
 705         return NULL;
 706     }
 707
 708     memcpy(tcpData->data, data, dataLength);
 709     tcpData->dataLen = dataLength;
 710
 711     tcpData->isMulticast = isMulticast;
 712
 713     return tcpData;
 714 }
 715
 716 void CAFreeTCPData(CATCPData *tcpData)
 717 {
 718     VERIFY_NON_NULL_VOID(tcpData, TAG, "tcpData is NULL");
 719
 720     CAFreeEndpoint(tcpData->remoteEndpoint);
 721     OICFree(tcpData->data);
 722     OICFree(tcpData);
 723 }
 724
 725 void CADataDestroyer(void *data, uint32_t size)
 726 {
 727     if (size < sizeof(CATCPData))
 728     {
 729 #ifndef __TIZENRT__
 730         OIC_LOG_V(ERROR, TAG, "Destroy data too small %p %" PRIu32, data, size);
 731 #endif
 732     }
 733     CATCPData *TCPData = (CATCPData *) data;
 734
 735     CAFreeTCPData(TCPData);
 736 }
 737
 738 #ifdef SINGLE_THREAD
 739 size_t CAGetTotalLengthFromPacketHeader(const unsigned char *recvBuffer, size_t size)
 740 {
 741     OIC_LOG(DEBUG, TAG, "IN - CAGetTotalLengthFromHeader");
 742
 743     if (NULL == recvBuffer || !size)
 744     {
 745         OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
 746         return 0;
 747     }
 748
 749     coap_transport_t transport = coap_get_tcp_header_type_from_initbyte(
 750             ((unsigned char *)recvBuffer)[0] >> 4);
 751     size_t optPaylaodLen = coap_get_length_from_header((unsigned char *)recvBuffer,
 752                                                         transport);
 753     size_t headerLen = coap_get_tcp_header_length((unsigned char *)recvBuffer);
 754
 755     OIC_LOG_V(DEBUG, TAG, "option/paylaod length [%d]", optPaylaodLen);
 756     OIC_LOG_V(DEBUG, TAG, "header length [%d]", headerLen);
 757     OIC_LOG_V(DEBUG, TAG, "total data length [%d]", headerLen + optPaylaodLen);
 758
 759     OIC_LOG(DEBUG, TAG, "OUT - CAGetTotalLengthFromHeader");
 760     return headerLen + optPaylaodLen;
 761 }
 762
 763 void CAGetTCPHeaderDetails(unsigned char* recvBuffer, coap_transport_t *transport,
 764                            size_t *headerlen)
 765 {
 766     if (NULL == recvBuffer)
 767     {
 768         OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
 769         return;
 770     }
 771
 772     if (NULL == transport)
 773     {
 774         OIC_LOG(ERROR, TAG, "transport is NULL");
 775         return;
 776     }
 777
 778     if (NULL == headerlen)
 779     {
 780         OIC_LOG(ERROR, TAG, "headerlen is NULL");
 781         return;
 782     }
 783
 784     *transport = coap_get_tcp_header_type_from_initbyte(
 785         ((unsigned char *)recvBuffer)[0] >> 4);
 786     *headerlen = coap_get_tcp_header_length_for_transport(*transport);
 787 }
 788 #endif