Imported Upstream version 0.9.2
[platform/upstream/iotivity.git] / resource / csdk / connectivity / src / ip_adapter / android / caipnwmonitor.c
index 4272e65..2f4b5d5 100644 (file)
 /******************************************************************
- *
- * Copyright 2014 Samsung Electronics All Rights Reserved.
- *
- *
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- ******************************************************************/
+*
+* Copyright 2014 Samsung Electronics All Rights Reserved.
+*
+*
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*
+******************************************************************/
 
 #include "caipinterface.h"
 
-#include <string.h>
-#include <sys/ioctl.h>
-#include <arpa/inet.h>
-#include <linux/if.h>
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <sys/socket.h>
 #include <netdb.h>
+#include <string.h>
 #include <errno.h>
 #include <unistd.h>
 
+#include <arpa/inet.h>
+#include <linux/if.h>
+
 #include "caadapterutils.h"
-#include "camutex.h"
 #include "logger.h"
 #include "oic_malloc.h"
 #include "oic_string.h"
-#include "org_iotivity_ca_CaIpInterface.h"
-
-#define IP_MONITOR_TAG "IP_MONITOR"
-#define MAX_INTERFACE_INFO_LENGTH (1024)
-
-/**
- * @var g_stopNetworkMonitor
- * @brief  Used to stop the network monitor thread.
- */
-static bool g_stopNetworkMonitor = false;
-
-/**
- * @var g_stopNetworkMonitorMutex
- * @brief  Mutex for synchronizing access to g_stopNetworkMonitor flag.
- */
-static ca_mutex g_stopNetworkMonitorMutex = NULL;
-
-/**
- * @struct CAIPNwMonitorContext
- * @brief  Used for storing network monitor context information.
- */
-typedef struct
-{
-    u_arraylist_t *netInterfaceList;
-    ca_thread_pool_t threadPool;
-    CANetworkStatus_t nwConnectivityStatus;
-    CAIPConnectionStateChangeCallback networkChangeCb;
-} CAIPNetworkMonitorContext;
-
-/**
- * @var g_networkMonitorContext
- * @brief  network monitor context.
- */
-static CAIPNetworkMonitorContext *g_networkMonitorContext = NULL;
-
-/**
- * @var g_networkMonitorContextMutex
- * @brief  Mutex for synchronizing access to cached interface and IP address information.
- */
-static ca_mutex g_networkMonitorContextMutex = NULL;
-
-/**
- * @var g_jvm
- * @brief pointer to store JavaVM
- */
-static JavaVM *g_jvm = NULL;
-
-/**
- * @var g_context
- * @brief pointer to store Application Context
- */
-static jobject g_context = NULL;
 
-/**
- * @fn CAIPUpdateInterfaceInformation
- * @brief This methods gets local interface name and IP address information.
- */
-static CAResult_t CAIPUpdateInterfaceInformation(u_arraylist_t **netInterfaceList);
-/**
- * @fn CACreateIPJNIInterfaceObject
- * @brief creates new instance of caipinterface through JNI
- */
-static CAResult_t CACreateIPJNIInterfaceObject(jobject context);
+#define TAG "IP_MONITOR"
 
-/**
- * @fn CAIPSendNetworkChangeCallback
- * @brief updates network status to IP adapter
- */
-static void CAIPSendNetworkChangeCallback(CANetworkStatus_t currNetworkStatus);
+char *getHostIPAddress(const char *ifa_name) {
+    static char address[INET_ADDRSTRLEN] = {};
+    memset(&address, 0, INET_ADDRSTRLEN);
+    struct ifreq ifr;
+    int sck, status, len = sizeof(ifr.ifr_name) - 1;
+    char *ip;
 
-CAResult_t CAIPJniInit()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPJniInit");
-    g_jvm = CANativeJNIGetJavaVM();
-
-    if (!g_jvm)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "JNI initialize error");
-        return CA_STATUS_FAILED;
-    }
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-CAResult_t CAIPJniSetContext()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPJniSetContext");
-    g_context = (jobject) CANativeJNIGetContext();
-
-    if (!g_context)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "unable to get application context");
-        return CA_STATUS_FAILED;
+    if ((sck = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+        return NULL;
     }
 
-    return CA_STATUS_OK;
-}
-
-CAResult_t CACreateIPJNIInterfaceObject(jobject context)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CACreateIPJNIInterfaceObject");
-
-    VERIFY_NON_NULL(context, IP_MONITOR_TAG, "context");
-
-    JNIEnv* env;
-
-    if ((*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6) != JNI_OK)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get JNIEnv pointer");
-        return CA_STATUS_FAILED;
-    }
-
-    //getApplicationContext
-    jclass contextClass = (*env)->FindClass(env, "android/content/Context");
-    if (!contextClass)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get context object class");
-        return CA_STATUS_FAILED;
-    }
-
-    jmethodID getApplicationContextMethod = (*env)->GetMethodID(env, contextClass,
-                                                                "getApplicationContext",
-                                                                "()Landroid/content/Context;");
-    if (!getApplicationContextMethod)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get getApplicationContext method");
-        return CA_STATUS_FAILED;
-    }
-
-    jobject gApplicationContext = (*env)->CallObjectMethod(env, context,
-                                                           getApplicationContextMethod);
-    if (!getApplicationContextMethod)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get getApplicationContext");
-        return CA_STATUS_FAILED;
-    }
-
-    //Create caipinterface jni instance
-    jclass IPJniInterface = (*env)->FindClass(env, "org/iotivity/ca/CaIpInterface");
-    if (!IPJniInterface)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get caipinterface class");
-        return CA_STATUS_FAILED;
-    }
-
-    jmethodID IPInterfaceConstructorMethod = (*env)->GetMethodID(env, IPJniInterface, "<init>",
-                                                                   "(Landroid/content/Context;)V");
-    if (!IPInterfaceConstructorMethod)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Could not get caipinterface constructor method");
-        return CA_STATUS_FAILED;
-    }
-
-    (*env)->NewObject(env, IPJniInterface, IPInterfaceConstructorMethod, gApplicationContext);
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "Create caipinterface instance, success");
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-static CAResult_t CAIPUpdateInterfaceInformation(u_arraylist_t **netInterfaceList)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    VERIFY_NON_NULL(netInterfaceList, IP_MONITOR_TAG, "netInterfaceList is null");
-
-    /* Get a socket handle. */
-    int sck = -1;
-#ifdef SOCK_CLOEXEC
-    sck = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
-#endif
-
-    if ( -1 == sck)
-    {
-        sck=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
-    }
-
-    if (sck < 0)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Error in socket creation");
-        return CA_STATUS_FAILED;
-    }
-
-    char buf[MAX_INTERFACE_INFO_LENGTH] = { 0 };
-    struct ifconf ifc;
-
-    /* Query available interfaces. */
-    ifc.ifc_len = MAX_INTERFACE_INFO_LENGTH;
-    ifc.ifc_buf = buf;
-
-    if (ioctl(sck, SIOCGIFCONF, &ifc) < 0)
-    {
+    strncpy(ifr.ifr_name, ifa_name, len);
+    ifr.ifr_name[len] = '\0';
+    if ((status = ioctl(sck, SIOCGIFADDR, &ifr)) < 0) {
         close(sck);
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Failed to get interface info");
-        return CA_STATUS_FAILED;
+        return NULL;
     }
-
-    /* Iterate through the list of interfaces. */
-    struct ifreq* ifr = ifc.ifc_req;
-    int32_t interfaces = ifc.ifc_len / sizeof(struct ifreq);
-
-    OIC_LOG_V(DEBUG, IP_MONITOR_TAG, "CAIPUpdateInterfaceInformation : %d", interfaces);
-
-    for (int32_t i = 0; i < interfaces; i++)
-    {
-        struct ifreq temp_ifr = { 0 };
-        struct ifreq* item = &ifr[i];
-
-        char interfaceAddress[CA_IPADDR_SIZE] = { 0 };
-        char interfaceSubnetMask[CA_IPADDR_SIZE] = { 0 };
-        socklen_t len = sizeof(struct sockaddr_in);
-
-        strcpy(temp_ifr.ifr_name, item->ifr_name);
-
-        if (ioctl(sck, SIOCGIFFLAGS, &temp_ifr))
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG,
-                    "CAIPUpdateInterfaceInformation, SIOCGIFFLAGS Failed");
-            close(sck);
-            return CA_STATUS_FAILED;
-        }
-
-        if ((temp_ifr.ifr_flags & IFF_LOOPBACK)
-            || !(temp_ifr.ifr_flags & IFF_UP) || !(temp_ifr.ifr_flags & IFF_RUNNING))
-        {
-            continue;
-        }
-
-        if (AF_INET != ((struct sockaddr_in*) &item->ifr_addr)->sin_family)
-        {
-            continue;
-        }
-
-        //get the interface ip address
-        if (0 != getnameinfo(&item->ifr_addr, len, interfaceAddress, sizeof(interfaceAddress),
-                             NULL, 0, NI_NUMERICHOST))
-        {
-            OIC_LOG_V(ERROR, IP_MONITOR_TAG, "Failed to get IPAddress, Error code: %s",
-                    strerror(errno));
-            close(sck);
-            return CA_STATUS_FAILED;
-        }
-
-        if (ioctl((int) sck, SIOCGIFNETMASK, item) < 0)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG,
-                    "CAIPUpdateInterfaceInformation, SIOCGIFNETMASK Failed");
-            close(sck);
-            return CA_STATUS_FAILED;
-        }
-
-        // get the interface subnet mask
-        if (0 != getnameinfo(&item->ifr_netmask, len, interfaceSubnetMask,
-                             sizeof(interfaceSubnetMask), NULL, 0, NI_NUMERICHOST))
-        {
-            OIC_LOG_V(ERROR, IP_MONITOR_TAG, "Failed to get subnet mask, Error code: %s",
-                    strerror(errno));
-            close(sck);
-            return CA_STATUS_FAILED;
-        }
-
-        CANetInfo_t *netInfo = (CANetInfo_t *) OICCalloc(1, sizeof(CANetInfo_t));
-        if (!netInfo)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "Malloc failed");
-            close(sck);
-            return CA_MEMORY_ALLOC_FAILED;
-        }
-
-        // set interface name
-        strncpy(netInfo->interfaceName, item->ifr_name, strlen(item->ifr_name));
-
-        // set local ip address
-        strncpy(netInfo->ipAddress, interfaceAddress, strlen(interfaceAddress));
-
-        // set subnet mask
-        strncpy(netInfo->subnetMask, interfaceSubnetMask, strlen(interfaceSubnetMask));
-
-        CAResult_t result = u_arraylist_add(*netInterfaceList, (void *) netInfo);
-        if (CA_STATUS_OK != result)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_add failed!Thread exiting.");
-            close(sck);
-            return CA_STATUS_FAILED;
-        }
-
-        OIC_LOG_V(DEBUG, IP_MONITOR_TAG, "ipAddress : %s, interfaceName : %s, subnetmask : %s",
-                netInfo->ipAddress, netInfo->interfaceName, netInfo->subnetMask);
-        close(sck);
-        return CA_STATUS_OK;
-
-        break;
-    }
-
     close(sck);
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_FAILED;
+    ip = inet_ntoa(((struct sockaddr_in *)(&ifr.ifr_addr))->sin_addr);
+    len = sizeof(address) - 1;
+    strncpy(address, ip, len);
+    address[len] = '\0';
+    return address;
 }
 
-static bool CACheckIsAnyInterfaceDown(const u_arraylist_t *netInterfaceList,
-                                      const CANetInfo_t *info)
+u_arraylist_t *CAIPGetInterfaceInformation(int desiredIndex)
 {
-    VERIFY_NON_NULL_RET(netInterfaceList, IP_MONITOR_TAG, "netInterfaceList is null", false);
-    VERIFY_NON_NULL_RET(info, IP_MONITOR_TAG, "info is null", false);
-
-    uint32_t list_length = u_arraylist_length(netInterfaceList);
-    for (uint32_t list_index = 0; list_index < list_length; list_index++)
+    u_arraylist_t *iflist = u_arraylist_create();
+    if (!iflist)
     {
-        CANetInfo_t *netInfo = (CANetInfo_t *) u_arraylist_get(netInterfaceList, list_index);
-        if (!netInfo)
-        {
-            continue;
-        }
-        if (strncmp(netInfo->interfaceName, info->interfaceName, strlen(info->interfaceName)) == 0)
-        {
-            return false;
-        }
+        OIC_LOG_V(ERROR, TAG, "Failed to create iflist: %s", strerror(errno));
+        return NULL;
     }
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "Interface is down");
-    return true;
-}
-
-static bool CACheckIsInterfaceInfoChanged(const CANetInfo_t *info)
-{
-    VERIFY_NON_NULL_RET(info, IP_MONITOR_TAG, "info is null", false);
 
-    ca_mutex_lock(g_networkMonitorContextMutex);
-
-    uint32_t list_length = u_arraylist_length(g_networkMonitorContext->netInterfaceList);
-    for (uint32_t list_index = 0; list_index < list_length; list_index++)
+    char* ipAddr = getHostIPAddress("wlan0");
+    if (NULL == ipAddr)
     {
-        CANetInfo_t *netInfo = (CANetInfo_t *) u_arraylist_get(
-                               g_networkMonitorContext->netInterfaceList, list_index);
-        if (!netInfo)
-        {
-            continue;
-        }
-        if (strncmp(netInfo->interfaceName, info->interfaceName, strlen(info->interfaceName)) == 0)
-        {
-            if (strncmp(netInfo->ipAddress, info->ipAddress, strlen(info->ipAddress)) == 0)
-            {
-                ca_mutex_unlock(g_networkMonitorContextMutex);
-                return false;
-            }
-            else
-            {
-                OIC_LOG(DEBUG, IP_MONITOR_TAG, "Network interface info changed");
-                if (u_arraylist_remove(g_networkMonitorContext->netInterfaceList, list_index))
-                {
-                    if (g_networkMonitorContext->networkChangeCb)
-                    {
-                        g_networkMonitorContext->networkChangeCb(netInfo->ipAddress,
-                                                                 CA_INTERFACE_DOWN);
-                    }
-                    OICFree(netInfo);
-                }
-                else
-                {
-                    OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_remove failed");
-                }
-                break;
-            }
-        }
-    }
+        OIC_LOG_V(ERROR, TAG, "Failed to get ifaddrs: %s", strerror(errno));
+        u_arraylist_destroy(iflist);
+        return NULL;
+    } 
+    OIC_LOG_V(DEBUG, TAG, "Got ifaddrs:: %s", ipAddr);
 
-    CANetInfo_t *newNetInfo = (CANetInfo_t *) OICMalloc(sizeof(CANetInfo_t));
-    if (!newNetInfo)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "newNetInfo malloc failed");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return false;
-    }
-    memcpy(newNetInfo, info, sizeof(*newNetInfo));
+    struct in_addr inaddr;
+    inet_pton(AF_INET, ipAddr, &(inaddr));
 
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "New Interface found");
+    CAInterface_t *ifitem = (CAInterface_t *)OICCalloc(1, sizeof(CAInterface_t));;
+    OICStrcpy(ifitem->name, INTERFACE_NAME_MAX, "wlan0");
+    ifitem->index = 0; //if_nametoindex("wlan0");
+    ifitem->family = AF_INET; //we support ipv4 only
+    ifitem->ipv4addr = inaddr.s_addr;
+    ifitem->flags = IFF_UP|IFF_RUNNING;
 
-    CAResult_t result = u_arraylist_add(g_networkMonitorContext->netInterfaceList,
-                                        (void *) newNetInfo);
+    CAResult_t result = u_arraylist_add(iflist, ifitem);
     if (CA_STATUS_OK != result)
     {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_add failed!");
-        OICFree(newNetInfo);
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return false;
-    }
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    /*Callback will be unset only at the time of termination. By that time, all the threads will be
-      stopped gracefully. This callback is properly protected*/
-    if (g_networkMonitorContext->networkChangeCb)
-    {
-        g_networkMonitorContext->networkChangeCb(newNetInfo->ipAddress, CA_INTERFACE_UP);
-    }
-
-    return true;
-}
-
-static CAResult_t CAInitializeNetworkMonitorMutexes()
-{
-    if (!g_networkMonitorContextMutex)
-    {
-        g_networkMonitorContextMutex = ca_mutex_new();
-        if (!g_networkMonitorContextMutex)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "g_networkMonitorContextMutex Malloc  failed");
-            return CA_MEMORY_ALLOC_FAILED;
-        }
+        OIC_LOG(ERROR, TAG, "u_arraylist_add failed.");
+        goto exit;
     }
 
-    if (!g_stopNetworkMonitorMutex)
-    {
-        g_stopNetworkMonitorMutex = ca_mutex_new();
-        if (!g_stopNetworkMonitorMutex)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "g_stopNetworkMonitorMutex Malloc  failed");
-            ca_mutex_free(g_networkMonitorContextMutex);
-            return CA_MEMORY_ALLOC_FAILED;
-        }
-    }
-    return CA_STATUS_OK;
-}
+    OIC_LOG_V(ERROR, TAG, "Added interface: %s (%d)", ifitem->name, ifitem->family);
 
-static void CADestroyNetworkMonitorMutexes()
-{
-    ca_mutex_free(g_networkMonitorContextMutex);
-    g_networkMonitorContextMutex = NULL;
-
-    ca_mutex_free(g_stopNetworkMonitorMutex);
-    g_stopNetworkMonitorMutex = NULL;
-}
-
-CAResult_t CAIPInitializeNetworkMonitor(const ca_thread_pool_t threadPool)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPInitializeNetworkMonitor IN");
-
-    VERIFY_NON_NULL(threadPool, IP_MONITOR_TAG, "threadPool is null");
-
-    CAResult_t ret = CAIPJniInit();
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Initialization failed");
-        return ret;
-    }
-
-    ret = CAIPJniSetContext();
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "CAIPJniSetContext failed");
-        return ret;
-    }
-
-    ret = CACreateIPJNIInterfaceObject(g_context);
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "unable to create caipinterface instance");
-        return ret;
-    }
-
-    ret = CAInitializeNetworkMonitorMutexes();
-
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "CAInitializeNetworkMonitorMutexes failed");
-        return CA_STATUS_FAILED;
-    }
-
-    ca_mutex_lock(g_networkMonitorContextMutex);
-
-    g_networkMonitorContext = (CAIPNetworkMonitorContext *) OICCalloc(
-            1, sizeof(*g_networkMonitorContext));
-    if (!g_networkMonitorContext)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "g_networkMonitorContext Malloc  failed");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        CADestroyNetworkMonitorMutexes();
-        return CA_MEMORY_ALLOC_FAILED;
-    }
-    g_networkMonitorContext->threadPool = threadPool;
-
-    g_networkMonitorContext->netInterfaceList = u_arraylist_create();
-    if (!g_networkMonitorContext->netInterfaceList)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_create failed");
-        OICFree(g_networkMonitorContext);
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        CADestroyNetworkMonitorMutexes();
-        return CA_MEMORY_ALLOC_FAILED;
-    }
-
-    CAIPUpdateInterfaceInformation(&g_networkMonitorContext->netInterfaceList);
-
-    if (u_arraylist_length(g_networkMonitorContext->netInterfaceList))
-    {
-        g_networkMonitorContext->nwConnectivityStatus = CA_INTERFACE_UP;
-    }
-    else
-    {
-        g_networkMonitorContext->nwConnectivityStatus = CA_INTERFACE_DOWN;
-    }
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-void CAIPTerminateNetworkMonitor()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    g_networkMonitorContext->threadPool = NULL;
-
-    CAClearNetInterfaceInfoList(g_networkMonitorContext->netInterfaceList);
-
-    g_networkMonitorContext->netInterfaceList = NULL;
-    g_networkMonitorContext->nwConnectivityStatus = CA_INTERFACE_DOWN;
-    g_networkMonitorContext->networkChangeCb = NULL;
-    g_networkMonitorContext->threadPool = NULL;
-
-    OICFree(g_networkMonitorContext);
-    g_networkMonitorContext = NULL;
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    ca_mutex_lock(g_stopNetworkMonitorMutex);
-    g_stopNetworkMonitor = true;
-    ca_mutex_unlock(g_stopNetworkMonitorMutex);
-
-    CADestroyNetworkMonitorMutexes();
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-}
-
-CAResult_t CAIPStartNetworkMonitor()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    ca_mutex_lock(g_stopNetworkMonitorMutex);
-    g_stopNetworkMonitor = false;
-    ca_mutex_unlock(g_stopNetworkMonitorMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-CAResult_t CAIPStopNetworkMonitor()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if (!g_networkMonitorContext)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "g_networkMonitorContext is null");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return CA_STATUS_FAILED;
-    }
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    ca_mutex_lock(g_stopNetworkMonitorMutex);
-    if (!g_stopNetworkMonitor)
-    {
-        g_stopNetworkMonitor = true;
-    }
-    else
-    {
-        OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPStopNetworkMonitor, already stopped!");
-    }
-    ca_mutex_unlock(g_stopNetworkMonitorMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-CAResult_t CAIPGetInterfaceInfo(u_arraylist_t **netInterfaceList)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    VERIFY_NON_NULL(netInterfaceList, IP_MONITOR_TAG, "u_array_list is null");
-    VERIFY_NON_NULL(g_networkMonitorContext, IP_MONITOR_TAG, "g_networkMonitorContext is null");
-    VERIFY_NON_NULL(g_networkMonitorContextMutex, IP_MONITOR_TAG,
-                    "g_networkMonitorContextMutex is null");
-
-    // Get the interface and ipaddress information from cache
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if (!g_networkMonitorContext->netInterfaceList
-        || !(u_arraylist_length(g_networkMonitorContext->netInterfaceList)))
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "Network not enabled");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return CA_ADAPTER_NOT_ENABLED;
-    }
-
-    uint32_t list_length = u_arraylist_length(g_networkMonitorContext->netInterfaceList);
-    OIC_LOG_V(DEBUG, IP_MONITOR_TAG, "CAIPGetInterfaceInfo list length [%d]",
-            list_length);
-    for (uint32_t list_index = 0; list_index < list_length; list_index++)
-    {
-        CANetInfo_t *info = (CANetInfo_t *) u_arraylist_get(
-                g_networkMonitorContext->netInterfaceList, list_index);
-        if (!info)
-        {
-            continue;
-        }
-        OIC_LOG_V(DEBUG, IP_MONITOR_TAG, "CAIPGetInterfaceInfo ip [%s]",
-                  info->ipAddress);
-        CANetInfo_t *newNetinfo = (CANetInfo_t *) OICMalloc(sizeof(CANetInfo_t));
-        if (!newNetinfo)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "Malloc failed!");
-            ca_mutex_unlock(g_networkMonitorContextMutex);
-            return CA_MEMORY_ALLOC_FAILED;
-        }
-
-        memcpy(newNetinfo, info, sizeof(*info));
-
-        CAResult_t result = u_arraylist_add(*netInterfaceList, (void *) newNetinfo);
-        if (CA_STATUS_OK != result)
-        {
-            OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_add failed!");
-            ca_mutex_unlock(g_networkMonitorContextMutex);
-            return CA_STATUS_FAILED;
-        }
-    }
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-CAResult_t CAIPGetInterfaceSubnetMask(const char *ipAddress, char **subnetMask)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-
-    VERIFY_NON_NULL(subnetMask, IP_MONITOR_TAG, "subnet mask");
-    VERIFY_NON_NULL(ipAddress, IP_MONITOR_TAG, "ipAddress is null");
-    VERIFY_NON_NULL(g_networkMonitorContext, IP_MONITOR_TAG, "g_networkMonitorContext is null");
-    VERIFY_NON_NULL(g_networkMonitorContextMutex, IP_MONITOR_TAG,
-                    "g_networkMonitorContextMutex is null");
-
-    // Get the interface and ipaddress information from cache
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if (!g_networkMonitorContext->netInterfaceList
-        || (0 == u_arraylist_length(g_networkMonitorContext->netInterfaceList)))
-    {
-        OIC_LOG(DEBUG, IP_MONITOR_TAG, "Network not enabled");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return CA_ADAPTER_NOT_ENABLED;
-    }
-
-    uint32_t list_length = u_arraylist_length(g_networkMonitorContext->netInterfaceList);
-    OIC_LOG_V(DEBUG, IP_MONITOR_TAG, "list lenght [%d]", list_length);
-    for (uint32_t list_index = 0; list_index < list_length; list_index++)
-    {
-        CANetInfo_t *info = (CANetInfo_t *) u_arraylist_get(
-                g_networkMonitorContext->netInterfaceList, list_index);
-        if (!info)
-        {
-            continue;
-        }
-
-        if (strncmp(info->ipAddress, ipAddress, strlen(ipAddress)) == 0)
-        {
-            OIC_LOG_V(DEBUG, IP_MONITOR_TAG,
-                      "CAIPGetInterfaceSubnetMask subnetmask is %s", info->subnetMask);
-            *subnetMask = OICStrdup(info->subnetMask);
-            break;
-        }
-    }
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return CA_STATUS_OK;
-}
-
-bool CAIPIsConnected()
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-    if (!g_networkMonitorContextMutex || !g_networkMonitorContext)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "IP is not connected");
-        return false;
-    }
-
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if (0 == u_arraylist_length(g_networkMonitorContext->netInterfaceList))
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "IP is not connected");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return false;
-    }
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-    return true;
-}
-
-void CAIPSetConnectionStateChangeCallback(CAIPConnectionStateChangeCallback callback)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-    if (!g_networkMonitorContextMutex || !g_networkMonitorContext)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "CAIPSetConnectionStateChangeCallback failed");
-        return;
-    }
-    ca_mutex_lock(g_networkMonitorContextMutex);
-
-    g_networkMonitorContext->networkChangeCb = callback;
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-}
-
-void CAIPSendNetworkChangeCallback(CANetworkStatus_t currNetworkStatus)
-{
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "IN");
-    ca_mutex_lock(g_stopNetworkMonitorMutex);
-
-    if (g_stopNetworkMonitor)
-    {
-        OIC_LOG(DEBUG, IP_MONITOR_TAG, "Stop Network Monitor Thread is called");
-        ca_mutex_unlock(g_stopNetworkMonitorMutex);
-        return;
-    }
-    ca_mutex_unlock(g_stopNetworkMonitorMutex);
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if(!g_networkMonitorContext)
-    {
-       OIC_LOG(DEBUG, IP_MONITOR_TAG, "g_networkChangeCb is NULL");
-       ca_mutex_unlock(g_networkMonitorContextMutex);
-       return;
-    }
-    if (!g_networkMonitorContext->networkChangeCb)
-    {    
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "g_networkChangeCb->networkChangeCb is NULL");
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return;
-    }
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-  
-    u_arraylist_t *netInterfaceList = u_arraylist_create();
-
-    VERIFY_NON_NULL_VOID(netInterfaceList, IP_MONITOR_TAG,
-                         "memory allocation failed for netInterfaceList");
-
-    // if network status is changed
-    CAResult_t ret = CAIPUpdateInterfaceInformation(&netInterfaceList);
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG, "could not update interface information");
-    }
-
-    ca_mutex_lock(g_networkMonitorContextMutex);
-    if (!g_networkMonitorContext->netInterfaceList)
-    {
-        OIC_LOG(ERROR, IP_MONITOR_TAG,
-                "u_arraylist_create failed. Network Monitor thread stopped");
-        CAClearNetInterfaceInfoList(netInterfaceList);
-        ca_mutex_unlock(g_networkMonitorContextMutex);
-        return;
-    }
-
-    uint32_t listLength = u_arraylist_length(g_networkMonitorContext->netInterfaceList);
-    for (uint32_t listIndex = 0; listIndex < listLength;)
-    {
-        CANetInfo_t *info = (CANetInfo_t *) u_arraylist_get(
-                g_networkMonitorContext->netInterfaceList, listIndex);
-        if (!info)
-        {
-            listIndex++;
-            continue;
-        }
-
-        bool ret = CACheckIsAnyInterfaceDown(netInterfaceList, info);
-        if (ret)
-        {
-            OIC_LOG(DEBUG, IP_MONITOR_TAG, "Interface is down");
-            if (u_arraylist_remove(g_networkMonitorContext->netInterfaceList, listIndex))
-            {
-                OIC_LOG(DEBUG, IP_MONITOR_TAG, "u_arraylist_remove success");
-                if (g_networkMonitorContext->networkChangeCb)
-                {
-                    g_networkMonitorContext->networkChangeCb(info->ipAddress, CA_INTERFACE_DOWN);
-                }
-                OICFree(info);
-                listLength--;
-            }
-            else
-            {
-                OIC_LOG(ERROR, IP_MONITOR_TAG, "u_arraylist_remove failed");
-                break;
-            }
-        }
-        else
-        {
-            listIndex++;
-        }
-    }
-
-    ca_mutex_unlock(g_networkMonitorContextMutex);
-
-    listLength = u_arraylist_length(netInterfaceList);
-    for (uint32_t listIndex = 0; listIndex < listLength; listIndex++)
-    {
-        CANetInfo_t *info = (CANetInfo_t *) u_arraylist_get(netInterfaceList, listIndex);
-        if (!info)
-        {
-            continue;
-        }
-        bool ret = CACheckIsInterfaceInfoChanged(info);
-        if (ret)
-        {
-            OIC_LOG(DEBUG, IP_MONITOR_TAG, "CACheckIsInterfaceInfoChanged true");
-        }
-    }
-
-    CAClearNetInterfaceInfoList(netInterfaceList);
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "OUT");
-}
-
-JNIEXPORT void JNICALL Java_org_iotivity_ca_CaIpInterface_stateEnabled
-  (JNIEnv *env, jclass clazz)
-{
-    CANetworkStatus_t currNetworkStatus = CA_INTERFACE_UP;
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPStateEnabled");
-
-    CAIPSendNetworkChangeCallback(currNetworkStatus);
-}
-
-JNIEXPORT void JNICALL Java_org_iotivity_ca_CaIpInterface_stateDisabled
-  (JNIEnv *env, jclass clazz)
-{
-    CANetworkStatus_t currNetworkStatus = CA_INTERFACE_DOWN;
-    OIC_LOG(DEBUG, IP_MONITOR_TAG, "CAIPStateDisabled");
+    return iflist;
 
-    CAIPSendNetworkChangeCallback(currNetworkStatus);
+exit:
+    u_arraylist_destroy(iflist);
+    return NULL;
 }