X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=resource%2Fcsdk%2Fconnectivity%2Fsrc%2Ftcp_adapter%2Fcatcpadapter.c;h=cd33343bff1c2f49ee5d780298022d7c141a73ff;hb=refs%2Ftags%2Fsubmit%2Ftizen%2F20180201.042114;hp=f75c5c5a6fb9f38356fbb2902d5898123b93c554;hpb=e2137b3741b8e04cc5d482c387b9ff5ea09b0c32;p=platform%2Fupstream%2Fiotivity.git

diff --git a/resource/csdk/connectivity/src/tcp_adapter/catcpadapter.c b/resource/csdk/connectivity/src/tcp_adapter/catcpadapter.c
index f75c5c5..cd33343 100644
--- a/resource/csdk/connectivity/src/tcp_adapter/catcpadapter.c
+++ b/resource/csdk/connectivity/src/tcp_adapter/catcpadapter.c
@@ -23,24 +23,30 @@
 #include <string.h>
 #include <stdint.h>
 
+#ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
+#endif
 #include <inttypes.h>
 
+#include "cainterface.h"
+#include "caipnwmonitor.h"
 #include "catcpadapter.h"
 #include "catcpinterface.h"
 #include "caqueueingthread.h"
 #include "caadapterutils.h"
-#include "camutex.h"
+#include "octhread.h"
 #include "uarraylist.h"
 #include "caremotehandler.h"
 #include "logger.h"
 #include "oic_malloc.h"
-#include "oic_string.h"
+#ifdef __WITH_TLS__
+#include "ca_adapter_net_ssl.h"
+#endif
 
 /**
  * Logging tag for module name.
  */
-#define TAG "TCP_ADAP"
+#define TAG "OIC_CA_TCP_ADAP"
 
 /**
  * Holds internal thread TCP data information.
@@ -68,17 +74,30 @@ static CAQueueingThread_t *g_sendQueueHandle = NULL;
 static CANetworkPacketReceivedCallback g_networkPacketCallback = NULL;
 
 /**
- * Network Changed Callback to CA.
+ * Adapter Changed Callback to CA.
  */
-static CANetworkChangeCallback g_networkChangeCallback = NULL;
+static CAAdapterChangeCallback g_networkChangeCallback = NULL;
+
+/**
+ * Connection Changed Callback to CA.
+ */
+static CAConnectionChangeCallback g_connectionChangeCallback = NULL;
 
 /**
  * error Callback to CA adapter.
  */
 static CAErrorHandleCallback g_errorCallback = NULL;
 
-static void CATCPPacketReceivedCB(const CAEndpoint_t *endpoint,
-                                  const void *data, uint32_t dataLength);
+/**
+ * KeepAlive Connected or Disconnected Callback to CA adapter.
+ */
+static CAKeepAliveConnectionCallback g_connKeepAliveCallback = NULL;
+
+static CAResult_t CATCPPacketReceivedCB(const CASecureEndpoint_t *sep,
+                                        const void *data, uint32_t dataLength);
+
+static void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
+                              size_t dataLength, CAResult_t result);
 
 static CAResult_t CATCPInitializeQueueHandles();
 
@@ -136,22 +155,94 @@ void CATCPConnectionStateCB(const char *ipAddress, CANetworkStatus_t status)
     (void)status;
 }
 
-void CATCPPacketReceivedCB(const CAEndpoint_t *endpoint, const void *data,
-                           uint32_t dataLength)
+CAResult_t CATCPPacketReceivedCB(const CASecureEndpoint_t *sep, const void *data,
+                                 uint32_t dataLength)
 {
-    VERIFY_NON_NULL_VOID(endpoint, TAG, "endpoint is NULL");
-    VERIFY_NON_NULL_VOID(data, TAG, "data is NULL");
+    VERIFY_NON_NULL(sep, TAG, "sep is NULL");
+    VERIFY_NON_NULL(data, TAG, "data is NULL");
 
-    OIC_LOG_V(DEBUG, TAG, "Address: %s, port:%d", endpoint->addr, endpoint->port);
+    OIC_LOG_V(DEBUG, TAG, "Address: %s, port:%d", sep->endpoint.addr, sep->endpoint.port);
 
+    CAResult_t res = CA_STATUS_OK;
+#ifdef SINGLE_THREAD
     if (g_networkPacketCallback)
     {
-        g_networkPacketCallback(endpoint, data, dataLength);
+        res = g_networkPacketCallback(sep, data, dataLength);
+        if (CA_STATUS_OK != res)
+        {
+            OIC_LOG(ERROR, TAG, "Error parsing CoAP data");
+        }
+    }
+#else
+    unsigned char *buffer = (unsigned char*)data;
+    size_t bufferLen = dataLength;
+    size_t index = 0;
+
+    //get remote device information from file descriptor.
+    CATCPSessionInfo_t *svritem = CAGetTCPSessionInfoFromEndpoint(&sep->endpoint, &index);
+    if (!svritem)
+    {
+        OIC_LOG(ERROR, TAG, "there is no connection information in list");
+        return CA_STATUS_INVALID_PARAM;
+    }
+    if (UNKNOWN == svritem->protocol)
+    {
+        OIC_LOG(ERROR, TAG, "invalid protocol type");
+        return CA_STATUS_INVALID_PARAM;
     }
+
+    //totalLen filled only when header fully read and parsed
+    while (0 != bufferLen)
+    {
+        res = CAConstructCoAP(svritem, &buffer, &bufferLen);
+        if (CA_STATUS_OK != res)
+        {
+            OIC_LOG_V(ERROR, TAG, "CAConstructCoAP return error : %d", res);
+            return res;
+        }
+
+        //when successfully read all required data - pass them to upper layer.
+        if (svritem->len == svritem->totalLen)
+        {
+            if (g_networkPacketCallback)
+            {
+                res = g_networkPacketCallback(sep, svritem->data, svritem->totalLen);
+                if (CA_STATUS_OK != res)
+                {
+                    OIC_LOG(ERROR, TAG, "Error parsing CoAP data");
+                    return res;
+                }
+            }
+            CACleanData(svritem);
+        }
+        else
+        {
+            OIC_LOG_V(DEBUG, TAG, "%u bytes required for complete CoAP",
+                                svritem->totalLen - svritem->len);
+        }
+    }
+#endif
+    return res;
 }
 
-void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
-                       uint32_t dataLength, CAResult_t result)
+#ifdef __WITH_TLS__
+static ssize_t CATCPPacketSendCB(CAEndpoint_t *endpoint, const void *data, size_t dataLength)
+{
+    OIC_LOG_V(DEBUG, TAG, "In %s", __func__);
+    VERIFY_NON_NULL_RET(endpoint, TAG, "endpoint is NULL", -1);
+    VERIFY_NON_NULL_RET(data, TAG, "data is NULL", -1);
+
+    OIC_LOG_V(DEBUG, TAG, "Address: %s, port:%d", endpoint->addr, endpoint->port);
+    OIC_LOG_BUFFER(DEBUG, TAG, data, dataLength);
+
+    ssize_t ret = CATCPSendData(endpoint, data, dataLength);
+    OIC_LOG_V(DEBUG, TAG, "Out %s : %d bytes sent", __func__, ret);
+    return ret;
+}
+#endif
+
+static void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
+                              size_t dataLength, CAResult_t result)
 {
     VERIFY_NON_NULL_VOID(endpoint, TAG, "endpoint is NULL");
     VERIFY_NON_NULL_VOID(data, TAG, "data is NULL");
@@ -162,8 +253,75 @@ void CATCPErrorHandler(const CAEndpoint_t *endpoint, const void *data,
     }
 }
 
+static void CATCPConnectionHandler(const CAEndpoint_t *endpoint, bool isConnected, bool isClient)
+{
+    // Pass the changed connection status to RI Layer for keepalive.
+    if (g_connKeepAliveCallback)
+    {
+        g_connKeepAliveCallback(endpoint, isConnected, isClient);
+    }
+
+    // Pass the changed connection status to CAUtil.
+    if (g_connectionChangeCallback)
+    {
+        g_connectionChangeCallback(endpoint, isConnected);
+    }
+}
+
+void CATCPSetKeepAliveCallbacks(CAKeepAliveConnectionCallback ConnHandler)
+{
+    g_connKeepAliveCallback = ConnHandler;
+}
+
+void CATCPAdapterHandler(CATransportAdapter_t adapter, CANetworkStatus_t status)
+{
+    if (g_networkChangeCallback)
+    {
+        g_networkChangeCallback(adapter, status);
+    }
+
+    if (CA_INTERFACE_DOWN == status)
+    {
+        OIC_LOG(INFO, TAG, "Network status is down, close all session");
+
+        CAResult_t res = CAQueueingThreadClearData(g_sendQueueHandle);
+        if (res != CA_STATUS_OK)
+        {
+            OIC_LOG_V(ERROR, TAG, "CAQueueingThreadClearData failed[%d]", res);
+        }
+
+        CATCPStopServer();
+    }
+    else if (CA_INTERFACE_UP == status)
+    {
+        OIC_LOG(INFO, TAG, "Network status is up, create new socket for listening");
+
+        CAResult_t ret = CA_STATUS_FAILED;
+#ifndef SINGLE_THREAD
+        ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
+#else
+        ret = CATCPStartServer();
+#endif
+        if (CA_STATUS_OK != ret)
+        {
+            OIC_LOG_V(ERROR, TAG, "CATCPStartServer failed[%d]", ret);
+        }
+    }
+}
+
 static void CAInitializeTCPGlobals()
 {
+    caglobals.tcp.ipv4.fd = -1;
+    caglobals.tcp.ipv4s.fd = -1;
+    caglobals.tcp.ipv6.fd = -1;
+    caglobals.tcp.ipv6s.fd = -1;
+
+    // Set the port number received from application.
+    caglobals.tcp.ipv4.port = caglobals.ports.tcp.u4;
+    caglobals.tcp.ipv4s.port = caglobals.ports.tcp.u4s;
+    caglobals.tcp.ipv6.port = caglobals.ports.tcp.u6;
+    caglobals.tcp.ipv6s.port = caglobals.ports.tcp.u6s;
+
     caglobals.tcp.selectTimeout = CA_TCP_SELECT_TIMEOUT;
     caglobals.tcp.listenBacklog = CA_TCP_LISTEN_BACKLOG;
     caglobals.tcp.svrlist = NULL;
@@ -179,30 +337,56 @@ static void CAInitializeTCPGlobals()
     }
 
     caglobals.tcp.ipv4tcpenabled = flags & CA_IPV4;
+    caglobals.tcp.ipv6tcpenabled = flags & CA_IPV6;
 }
 
 CAResult_t CAInitializeTCP(CARegisterConnectivityCallback registerCallback,
                            CANetworkPacketReceivedCallback networkPacketCallback,
-                           CANetworkChangeCallback netCallback,
+                           CAAdapterChangeCallback netCallback,
+                           CAConnectionChangeCallback connCallback,
                            CAErrorHandleCallback errorCallback, ca_thread_pool_t handle)
 {
     OIC_LOG(DEBUG, TAG, "IN");
     VERIFY_NON_NULL(registerCallback, TAG, "registerCallback");
     VERIFY_NON_NULL(networkPacketCallback, TAG, "networkPacketCallback");
     VERIFY_NON_NULL(netCallback, TAG, "netCallback");
+#ifndef SINGLE_THREAD
     VERIFY_NON_NULL(handle, TAG, "thread pool handle");
+#endif
 
     g_networkChangeCallback = netCallback;
+    g_connectionChangeCallback = connCallback;
     g_networkPacketCallback = networkPacketCallback;
     g_errorCallback = errorCallback;
 
     CAInitializeTCPGlobals();
+
+    CAResult_t res = CATCPCreateMutex();
+    if (CA_STATUS_OK == res)
+    {
+        res = CATCPCreateCond();
+    }
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "failed to create mutex/cond");
+        CATCPDestroyMutex();
+        CATCPDestroyCond();
+        return res;
+    }
+
+#ifndef SINGLE_THREAD
     caglobals.tcp.threadpool = handle;
+#endif
 
+    CATCPSetConnectionChangedCallback(CATCPConnectionHandler);
     CATCPSetPacketReceiveCallback(CATCPPacketReceivedCB);
     CATCPSetErrorHandler(CATCPErrorHandler);
 
-    CAConnectivityHandler_t TCPHandler = {
+#ifdef __WITH_TLS__
+    CAsetSslAdapterCallbacks(CATCPPacketReceivedCB, CATCPPacketSendCB, CA_ADAPTER_TCP);
+#endif
+
+    CAConnectivityHandler_t tcpHandler = {
         .startAdapter = CAStartTCP,
         .startListenServer = CAStartTCPListeningServer,
         .stopListenServer = CAStopTCPListeningServer,
@@ -212,8 +396,10 @@ CAResult_t CAInitializeTCP(CARegisterConnectivityCallback registerCallback,
         .GetnetInfo = CAGetTCPInterfaceInformation,
         .readData = CAReadTCPData,
         .stopAdapter = CAStopTCP,
-        .terminate = CATerminateTCP };
-    registerCallback(TCPHandler, CA_ADAPTER_TCP);
+        .terminate = CATerminateTCP,
+        .cType = CA_ADAPTER_TCP};
+
+    registerCallback(tcpHandler);
 
     OIC_LOG(INFO, TAG, "OUT IntializeTCP is Success");
     return CA_STATUS_OK;
@@ -221,6 +407,9 @@ CAResult_t CAInitializeTCP(CARegisterConnectivityCallback registerCallback,
 
 CAResult_t CAStartTCP()
 {
+    OIC_LOG(DEBUG, TAG, "IN");
+
+#ifndef SINGLE_THREAD
     if (CA_STATUS_OK != CATCPInitializeQueueHandles())
     {
         OIC_LOG(ERROR, TAG, "Failed to Initialize Queue Handle");
@@ -229,24 +418,96 @@ CAResult_t CAStartTCP()
     }
 
     // Start send queue thread
+#ifndef __TIZENRT__
     if (CA_STATUS_OK != CAQueueingThreadStart(g_sendQueueHandle))
+#else
+    if (CA_STATUS_OK != CAQueueingThreadStart(g_sendQueueHandle, "IoT_TCPSendQueue"))
+#endif
     {
         OIC_LOG(ERROR, TAG, "Failed to Start Send Data Thread");
         return CA_STATUS_FAILED;
     }
-
-    CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
+#else
+    CAResult_t ret = CATCPStartServer();
     if (CA_STATUS_OK != ret)
     {
-        OIC_LOG_V(ERROR, TAG, "Failed to start server![%d]", ret);
+        OIC_LOG_V(DEBUG, TAG, "CATCPStartServer failed[%d]", ret);
         return ret;
     }
+#endif
+
+    // Start network monitoring to receive adapter status changes.
+    CAIPStartNetworkMonitor(CATCPAdapterHandler, CA_ADAPTER_TCP);
 
     return CA_STATUS_OK;
 }
 
+static bool CAClearQueueEndpointDataContext(void *data, uint32_t size, void *ctx)
+{
+    (void)size;
+
+    if (NULL == data || NULL == ctx)
+    {
+        return false;
+    }
+
+    CATCPData *tcpData = (CATCPData *)data;
+    CAEndpoint_t *endpoint = (CAEndpoint_t *)ctx;
+
+    if (NULL != tcpData && NULL != tcpData->remoteEndpoint)
+    {
+        if (strcmp(tcpData->remoteEndpoint->addr, endpoint->addr) == 0
+            && tcpData->remoteEndpoint->port == endpoint->port)
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+CAResult_t CATCPDisconnectSession(const CAEndpoint_t *endpoint)
+{
+    CAResult_t res = CAQueueingThreadClearContextData(g_sendQueueHandle,
+                                                      CAClearQueueEndpointDataContext,
+                                                      endpoint);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "failed to clear context data");
+    }
+
+#ifdef __WITH_TLS__
+    res = CAcloseSslConnection(endpoint);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "failed to close TLS session");
+    }
+#endif
+
+    res = CASearchAndDeleteTCPSession(endpoint);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "failed to close TCP session");
+    }
+
+    return res;
+}
+
 CAResult_t CAStartTCPListeningServer()
 {
+#ifndef SINGLE_THREAD
+    if (!caglobals.server)
+    {
+        caglobals.server = true;    // only needed to run CA tests
+    }
+
+    CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
+    if (CA_STATUS_OK != ret)
+    {
+        OIC_LOG_V(ERROR, TAG, "Failed to start listening server![%d]", ret);
+        return ret;
+    }
+#endif
+
     return CA_STATUS_OK;
 }
 
@@ -257,6 +518,18 @@ CAResult_t CAStopTCPListeningServer()
 
 CAResult_t CAStartTCPDiscoveryServer()
 {
+    if (!caglobals.client)
+    {
+        caglobals.client = true;    // only needed to run CA tests
+    }
+
+    CAResult_t ret = CATCPStartServer((const ca_thread_pool_t)caglobals.tcp.threadpool);
+    if (CA_STATUS_OK != ret)
+    {
+        OIC_LOG_V(ERROR, TAG, "Failed to start discovery server![%d]", ret);
+        return ret;
+    }
+
     return CA_STATUS_OK;
 }
 
@@ -288,32 +561,59 @@ static size_t CAQueueTCPData(bool isMulticast, const CAEndpoint_t *endpoint,
 }
 
 int32_t CASendTCPUnicastData(const CAEndpoint_t *endpoint,
-                             const void *data, uint32_t dataLength)
+                             const void *data, uint32_t dataLength,
+                             CADataType_t dataType)
 {
+    OIC_LOG(DEBUG, TAG, "IN");
+    (void)dataType;
+#ifndef SINGLE_THREAD
     return CAQueueTCPData(false, endpoint, data, dataLength);
+#else
+    return CATCPSendData(endpoint, data, dataLength);
+#endif
 }
 
 int32_t CASendTCPMulticastData(const CAEndpoint_t *endpoint,
-                               const void *data, uint32_t dataLength)
+                               const void *data, uint32_t dataLength,
+                               CADataType_t dataType)
 {
+    (void)dataType;
     return CAQueueTCPData(true, endpoint, data, dataLength);
 }
 
 CAResult_t CAReadTCPData()
 {
+    OIC_LOG(DEBUG, TAG, "IN");
+#ifdef SINGLE_THREAD
+    CATCPPullData();
+#endif
     return CA_STATUS_OK;
 }
 
 CAResult_t CAStopTCP()
 {
+    CAIPStopNetworkMonitor(CA_ADAPTER_TCP);
+
+    /* Some times send queue thread fails to terminate as it's worker
+       thread gets blocked at TCP session's socket connect operation.
+       So closing sockets which are in connect operation at the time
+       of termination of adapter would save send queue thread from
+       getting blocked. */
+    CATCPCloseInProgressConnections();
+
+#ifndef SINGLE_THREAD
+    // Stop send queue thread.
     if (g_sendQueueHandle && g_sendQueueHandle->threadMutex)
     {
         CAQueueingThreadStop(g_sendQueueHandle);
     }
-
     CATCPDeinitializeQueueHandles();
+#endif
+
+    // Close TCP servers and established connections.
     CATCPStopServer();
-    //Re-initializing the Globals to start them again
+
+    // Re-initializing the Globals to start them again.
     CAInitializeTCPGlobals();
 
     return CA_STATUS_OK;
@@ -323,7 +623,8 @@ void CATerminateTCP()
 {
     CATCPSetPacketReceiveCallback(NULL);
 
-    CATCPDeinitializeQueueHandles();
+    CATCPDestroyMutex();
+    CATCPDestroyCond();
 }
 
 void CATCPSendDataThread(void *threadData)
@@ -335,6 +636,14 @@ void CATCPSendDataThread(void *threadData)
         return;
     }
 
+    if (caglobals.tcp.terminate)
+    {
+        OIC_LOG(DEBUG, TAG, "Adapter is not enabled");
+        CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
+                          CA_SEND_FAILED);
+        return;
+    }
+
     if (tcpData->isMulticast)
     {
         //Processing for sending multicast
@@ -343,8 +652,34 @@ void CATCPSendDataThread(void *threadData)
     }
     else
     {
+#ifdef __WITH_TLS__
+        if (tcpData->remoteEndpoint && tcpData->remoteEndpoint->flags & CA_SECURE)
+        {
+            CAResult_t result = CA_STATUS_OK;
+            OIC_LOG(DEBUG, TAG, "CAencryptSsl called!");
+            result = CAencryptSsl(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
+
+            if (CA_STATUS_OK != result)
+            {
+                OIC_LOG(ERROR, TAG, "CAAdapterNetDtlsEncrypt failed!");
+                CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
+                CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
+                                  CA_SEND_FAILED);
+            }
+            OIC_LOG_V(DEBUG, TAG,
+                      "CAAdapterNetDtlsEncrypt returned with result[%d]", result);
+            return;
+        }
+#endif
         //Processing for sending unicast
-        CATCPSendData(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen, false);
+         ssize_t dlen = CATCPSendData(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen);
+         if (-1 == dlen)
+         {
+             OIC_LOG(ERROR, TAG, "CATCPSendData failed");
+             CASearchAndDeleteTCPSession(tcpData->remoteEndpoint);
+             CATCPErrorHandler(tcpData->remoteEndpoint, tcpData->data, tcpData->dataLen,
+                               CA_SEND_FAILED);
+         }
     }
 }
 
@@ -391,9 +726,63 @@ void CADataDestroyer(void *data, uint32_t size)
 {
     if (size < sizeof(CATCPData))
     {
+#ifndef __TIZENRT__
         OIC_LOG_V(ERROR, TAG, "Destroy data too small %p %" PRIu32, data, size);
+#endif
     }
     CATCPData *TCPData = (CATCPData *) data;
 
     CAFreeTCPData(TCPData);
 }
+
+#ifdef SINGLE_THREAD
+size_t CAGetTotalLengthFromPacketHeader(const unsigned char *recvBuffer, size_t size)
+{
+    OIC_LOG(DEBUG, TAG, "IN - CAGetTotalLengthFromHeader");
+
+    if (NULL == recvBuffer || !size)
+    {
+        OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
+        return 0;
+    }
+
+    coap_transport_t transport = coap_get_tcp_header_type_from_initbyte(
+            ((unsigned char *)recvBuffer)[0] >> 4);
+    size_t optPaylaodLen = coap_get_length_from_header((unsigned char *)recvBuffer,
+                                                        transport);
+    size_t headerLen = coap_get_tcp_header_length((unsigned char *)recvBuffer);
+
+    OIC_LOG_V(DEBUG, TAG, "option/paylaod length [%d]", optPaylaodLen);
+    OIC_LOG_V(DEBUG, TAG, "header length [%d]", headerLen);
+    OIC_LOG_V(DEBUG, TAG, "total data length [%d]", headerLen + optPaylaodLen);
+
+    OIC_LOG(DEBUG, TAG, "OUT - CAGetTotalLengthFromHeader");
+    return headerLen + optPaylaodLen;
+}
+
+void CAGetTCPHeaderDetails(unsigned char* recvBuffer, coap_transport_t *transport,
+                           size_t *headerlen)
+{
+    if (NULL == recvBuffer)
+    {
+        OIC_LOG(ERROR, TAG, "recvBuffer is NULL");
+        return;
+    }
+
+    if (NULL == transport)
+    {
+        OIC_LOG(ERROR, TAG, "transport is NULL");
+        return;
+    }
+
+    if (NULL == headerlen)
+    {
+        OIC_LOG(ERROR, TAG, "headerlen is NULL");
+        return;
+    }
+
+    *transport = coap_get_tcp_header_type_from_initbyte(
+        ((unsigned char *)recvBuffer)[0] >> 4);
+    *headerlen = coap_get_tcp_header_length_for_transport(*transport);
+}
+#endif