resource/csdk/connectivity/src/ip_adapter/tizen/caipnwmonitor.c

   1 /******************************************************************
   2 *
   3 * Copyright 2014 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 <sys/types.h>
  22 #include <ifaddrs.h>
  23 #include <net/if.h>
  24 #include <sys/socket.h>
  25 #include <netdb.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <sys/ioctl.h>
  30 #include <linux/netlink.h>
  31 #include <linux/rtnetlink.h>
  32 #include <arpa/inet.h>
  33 #include <netinet/in.h>
  34 #include <wifi.h>
  35 #include <net_connection.h>
  36
  37 #include "caipinterface.h"
  38 #include "caipnwmonitor.h"
  39 #include "caadapterutils.h"
  40 #include "logger.h"
  41 #include "oic_malloc.h"
  42 #include "oic_string.h"
  43 #include <coap/utlist.h>
  44
  45 #define TAG "OIC_CA_IP_MONITOR"
  46
  47 #define NETLINK_MESSAGE_LENGTH  (4096)
  48 #define IFC_LABEL_LOOP          "lo"
  49 #define IFC_ADDR_LOOP_IPV4      "127.0.0.1"
  50 #define IFC_ADDR_LOOP_IPV6      "::1"
  51
  52 /**
  53  * Used to storing a connection handle for managing data connections.
  54  */
  55 static connection_h connection = NULL;
  56
  57 /**
  58  * Used to storing adapter changes callback interface.
  59  */
  60 static struct CAIPCBData_t *g_adapterCallbackList = NULL;
  61
  62 /**
  63  * Create new interface item.
  64  */
  65 static CAInterface_t *CANewInterfaceItem(int index, char *name, int family,
  66                                          const char *addr, int flags);
  67
  68 /**
  69  * Add new network interface in list.
  70  */
  71 static CAResult_t CAAddInterfaceItem(u_arraylist_t *iflist, int index,
  72                                      char *name, int family, const char *addr, int flags);
  73
  74 /**
  75  * Pass the changed network status through the stored callback.
  76  */
  77 static void CAIPPassNetworkChangesToAdapter(CANetworkStatus_t status);
  78
  79 /**
  80  * Callback function to received connection state changes.
  81  */
  82 static void CAIPConnectionStateChangedCb(connection_type_e type, void* userData);
  83
  84 int CAGetPollingInterval(int interval)
  85 {
  86     return interval;
  87 }
  88
  89 static void CAIPPassNetworkChangesToAdapter(CANetworkStatus_t status)
  90 {
  91     CAIPCBData_t *cbitem = NULL;
  92     LL_FOREACH(g_adapterCallbackList, cbitem)
  93     {
  94         if (cbitem && cbitem->adapter)
  95         {
  96             cbitem->callback(cbitem->adapter, status);
  97         }
  98     }
  99 }
 100
 101 CAResult_t CAIPSetNetworkMonitorCallback(CAIPAdapterStateChangeCallback callback,
 102                                          CATransportAdapter_t adapter)
 103 {
 104     if (!callback)
 105     {
 106         OIC_LOG(ERROR, TAG, "callback is null");
 107         return CA_STATUS_INVALID_PARAM;
 108     }
 109
 110     CAIPCBData_t *cbitem = NULL;
 111     LL_FOREACH(g_adapterCallbackList, cbitem)
 112     {
 113         if (cbitem && adapter == cbitem->adapter && callback == cbitem->callback)
 114         {
 115             OIC_LOG(DEBUG, TAG, "this callback is already added");
 116             return CA_STATUS_OK;
 117         }
 118     }
 119
 120     cbitem = (CAIPCBData_t *)OICCalloc(1, sizeof(*cbitem));
 121     if (!cbitem)
 122     {
 123         OIC_LOG(ERROR, TAG, "Malloc failed");
 124         return CA_STATUS_FAILED;
 125     }
 126
 127     cbitem->adapter = adapter;
 128     cbitem->callback = callback;
 129     LL_APPEND(g_adapterCallbackList, cbitem);
 130
 131     return CA_STATUS_OK;
 132 }
 133
 134 CAResult_t CAIPUnSetNetworkMonitorCallback(CATransportAdapter_t adapter)
 135 {
 136     CAIPCBData_t *cbitem = NULL;
 137     CAIPCBData_t *tmpCbitem = NULL;
 138     LL_FOREACH_SAFE(g_adapterCallbackList, cbitem, tmpCbitem)
 139     {
 140         if (cbitem && adapter == cbitem->adapter)
 141         {
 142             OIC_LOG(DEBUG, TAG, "remove specific callback");
 143             LL_DELETE(g_adapterCallbackList, cbitem);
 144             OICFree(cbitem);
 145             return CA_STATUS_OK;
 146         }
 147     }
 148     return CA_STATUS_OK;
 149 }
 150
 151 u_arraylist_t *CAFindInterfaceChange()
 152 {
 153     u_arraylist_t *iflist = NULL;
 154     char buf[NETLINK_MESSAGE_LENGTH] = { 0 };
 155     struct sockaddr_nl sa = { 0 };
 156     struct iovec iov = { .iov_base = buf,
 157                          .iov_len = sizeof (buf) };
 158     struct msghdr msg = { .msg_name = (void *)&sa,
 159                           .msg_namelen = sizeof (sa),
 160                           .msg_iov = &iov,
 161                           .msg_iovlen = 1 };
 162
 163     ssize_t len = recvmsg(caglobals.ip.netlinkFd, &msg, 0);
 164
 165     for (struct nlmsghdr *nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len); nh = NLMSG_NEXT(nh, len))
 166     {
 167         if (nh != NULL && nh->nlmsg_type != RTM_NEWLINK)
 168         {
 169             continue;
 170         }
 171         struct ifinfomsg *ifi = (struct ifinfomsg *)NLMSG_DATA(nh);
 172
 173         if ((!ifi || (ifi->ifi_flags & IFF_LOOPBACK) || !(ifi->ifi_flags & IFF_RUNNING)))
 174         {
 175             continue;
 176         }
 177
 178         int ifiIndex = ifi->ifi_index;
 179
 180         iflist = CAIPGetInterfaceInformation(ifiIndex);
 181
 182         if (!iflist)
 183         {
 184             OIC_LOG_V(ERROR, TAG, "get interface info failed: %s", strerror(errno));
 185             return NULL;
 186         }
 187     }
 188     return iflist;
 189 }
 190
 191 CAResult_t CAIPStartNetworkMonitor(CAIPAdapterStateChangeCallback callback,
 192                                    CATransportAdapter_t adapter)
 193 {
 194     if (!g_adapterCallbackList)
 195     {
 196         // Initialize Wifi service.
 197         if (WIFI_ERROR_NONE != wifi_initialize())
 198         {
 199             OIC_LOG(ERROR, TAG, "wifi_initialize failed");
 200         }
 201
 202         // Initialize Connections.
 203         connection_error_e ret = connection_create(&connection);
 204         if (CONNECTION_ERROR_NONE != ret)
 205         {
 206             OIC_LOG(ERROR, TAG, "connection_create failed");
 207             return CA_STATUS_FAILED;
 208         }
 209
 210         // Set callback for receiving state changes.
 211         ret = connection_set_type_changed_cb(connection, CAIPConnectionStateChangedCb, NULL);
 212         if (CONNECTION_ERROR_NONE != ret)
 213         {
 214             OIC_LOG(ERROR, TAG, "connection_set_type_changed_cb failed");
 215             return CA_STATUS_FAILED;
 216         }
 217     }
 218
 219     OIC_LOG(DEBUG, TAG, "Initialize network monitoring successfully");
 220     return CAIPSetNetworkMonitorCallback(callback, adapter);
 221 }
 222
 223 CAResult_t CAIPStopNetworkMonitor(CATransportAdapter_t adapter)
 224 {
 225     OIC_LOG(DEBUG, TAG, "IN");
 226
 227     CAIPUnSetNetworkMonitorCallback(adapter);
 228     if (!g_adapterCallbackList)
 229     {
 230         // Deinitialize Wifi service.
 231         if (WIFI_ERROR_NONE != wifi_deinitialize())
 232         {
 233             OIC_LOG(ERROR, TAG, "wifi_deinitialize failed");
 234         }
 235
 236         // Reset callback for receiving state changes.
 237         if (connection)
 238         {
 239             connection_error_e ret = connection_unset_type_changed_cb(connection);
 240             if (CONNECTION_ERROR_NONE != ret)
 241             {
 242                 OIC_LOG(ERROR, TAG, "connection_unset_type_changed_cb failed");
 243             }
 244
 245             // Deinitialize Wifi service.
 246             ret = connection_destroy(connection);
 247             if (CONNECTION_ERROR_NONE != ret)
 248             {
 249                 OIC_LOG(ERROR, TAG, "connection_destroy failed");
 250             }
 251             connection = NULL;
 252         }
 253     }
 254
 255     OIC_LOG(DEBUG, TAG, "Network monitoring terminated successfully");
 256     return CA_STATUS_OK;
 257 }
 258
 259 /**
 260  * Used to send netlink query to kernel and recv response from kernel.
 261  *
 262  * @param[in]   idx       desired network interface index, 0 means all interfaces.
 263  * @param[out]  iflist    linked list.
 264  *
 265  */
 266 static bool CAIPGetAddrInfo(int idx, u_arraylist_t *iflist)
 267 {
 268     if ((idx < 0) || (iflist == NULL))
 269     {
 270         return false;
 271     }
 272
 273     struct ifaddrs *ifp = NULL;
 274     if (-1 == getifaddrs(&ifp))
 275     {
 276         OIC_LOG_V(ERROR, TAG, "Failed to get ifaddrs: %s", strerror(errno));
 277         return false;
 278     }
 279
 280     struct ifaddrs *ifa = NULL;
 281     for (ifa = ifp; ifa; ifa = ifa->ifa_next)
 282     {
 283         if (!ifa->ifa_addr)
 284         {
 285             continue;
 286         }
 287
 288         int family = ifa->ifa_addr->sa_family;
 289         if ((ifa->ifa_flags & IFF_LOOPBACK) || (AF_INET != family && AF_INET6 != family))
 290         {
 291             continue;
 292         }
 293
 294         int ifindex = if_nametoindex(ifa->ifa_name);
 295         if (idx && (ifindex != idx))
 296         {
 297             continue;
 298         }
 299
 300         char ipaddr[MAX_ADDR_STR_SIZE_CA] = {0};
 301         if (family == AF_INET6)
 302         {
 303             struct sockaddr_in6 *in6 = (struct sockaddr_in6*) ifa->ifa_addr;
 304             inet_ntop(family, (void *)&(in6->sin6_addr), ipaddr, sizeof(ipaddr));
 305         }
 306         else if (family == AF_INET)
 307         {
 308             struct sockaddr_in *in = (struct sockaddr_in*) ifa->ifa_addr;
 309             inet_ntop(family, (void *)&(in->sin_addr), ipaddr, sizeof(ipaddr));
 310         }
 311
 312         if ((strcmp(ipaddr, IFC_ADDR_LOOP_IPV4) == 0) ||
 313             (strcmp(ipaddr, IFC_ADDR_LOOP_IPV6) == 0) ||
 314             (strcmp(ifa->ifa_name, IFC_LABEL_LOOP) == 0))
 315         {
 316             OIC_LOG(DEBUG, TAG, "LOOPBACK continue!!!");
 317             continue;
 318         }
 319
 320         CAResult_t result = CAAddInterfaceItem(iflist, ifindex,
 321                                                ifa->ifa_name, family,
 322                                                ipaddr, ifa->ifa_flags);
 323         if (CA_STATUS_OK != result)
 324         {
 325             OIC_LOG(ERROR, TAG, "CAAddInterfaceItem fail");
 326             goto exit;
 327         }
 328     }
 329     freeifaddrs(ifp);
 330     return true;
 331
 332 exit:
 333     freeifaddrs(ifp);
 334     return false;
 335 }
 336
 337 u_arraylist_t *CAIPGetInterfaceInformation(int desiredIndex)
 338 {
 339     u_arraylist_t *iflist = u_arraylist_create();
 340     if (!iflist)
 341     {
 342         OIC_LOG_V(ERROR, TAG, "Failed to create iflist: %s", strerror(errno));
 343         return NULL;
 344     }
 345
 346     if (!CAIPGetAddrInfo(desiredIndex, iflist))
 347     {
 348         goto exit;
 349     }
 350
 351     return iflist;
 352
 353 exit:
 354     u_arraylist_destroy(iflist);
 355     return NULL;
 356 }
 357
 358 static CAResult_t CAAddInterfaceItem(u_arraylist_t *iflist, int index,
 359                                      char *name, int family, const char *addr, int flags)
 360 {
 361     CAInterface_t *ifitem = CANewInterfaceItem(index, name, family, addr, flags);
 362     if (!ifitem)
 363     {
 364         return CA_STATUS_FAILED;
 365     }
 366     bool result = u_arraylist_add(iflist, ifitem);
 367     if (!result)
 368     {
 369         OIC_LOG(ERROR, TAG, "u_arraylist_add failed.");
 370         OICFree(ifitem);
 371         return CA_STATUS_FAILED;
 372     }
 373
 374     return CA_STATUS_OK;
 375 }
 376
 377 static CAInterface_t *CANewInterfaceItem(int index, char *name, int family,
 378                                          const char *addr, int flags)
 379 {
 380     CAInterface_t *ifitem = (CAInterface_t *)OICCalloc(1, sizeof (CAInterface_t));
 381     if (!ifitem)
 382     {
 383         OIC_LOG(ERROR, TAG, "Malloc failed");
 384         return NULL;
 385     }
 386
 387     OICStrcpy(ifitem->name, INTERFACE_NAME_MAX, name);
 388     ifitem->index = index;
 389     ifitem->family = family;
 390     OICStrcpy(ifitem->addr, sizeof(ifitem->addr), addr);
 391     ifitem->flags = flags;
 392
 393     return ifitem;
 394 }
 395
 396 void CAIPConnectionStateChangedCb(connection_type_e type, void* userData)
 397 {
 398     switch (type)
 399     {
 400         case CONNECTION_TYPE_DISCONNECTED:
 401             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_DISCONNECTED");
 402             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_DOWN);
 403             break;
 404         case CONNECTION_TYPE_ETHERNET:
 405             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_ETHERNET");
 406             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 407             break;
 408         case CONNECTION_TYPE_WIFI:
 409             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_WIFI");
 410             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 411             break;
 412         case CONNECTION_TYPE_CELLULAR:
 413             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_CELLULAR");
 414             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 415             break;
 416         default:
 417             break;
 418     }
 419 }