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_DELADDR && nh->nlmsg_type != RTM_NEWADDR))
 168         {
 169             continue;
 170         }
 171         struct ifinfomsg *ifi = (struct ifinfomsg *)NLMSG_DATA(nh);
 172         if (!ifi)
 173         {
 174             continue;
 175         }
 176
 177         int ifiIndex = ifi->ifi_index;
 178
 179         iflist = CAIPGetInterfaceInformation(ifiIndex);
 180         if (!iflist)
 181         {
 182             OIC_LOG_V(ERROR, TAG, "get interface info failed: %s", strerror(errno));
 183             return NULL;
 184         }
 185     }
 186     return iflist;
 187 }
 188
 189 CAResult_t CAIPStartNetworkMonitor(CAIPAdapterStateChangeCallback callback,
 190                                    CATransportAdapter_t adapter)
 191 {
 192     if (!g_adapterCallbackList)
 193     {
 194         // Initialize Wifi service.
 195         if (WIFI_ERROR_NONE != wifi_initialize())
 196         {
 197             OIC_LOG(ERROR, TAG, "wifi_initialize failed");
 198         }
 199
 200         // Initialize Connections.
 201         connection_error_e ret = connection_create(&connection);
 202         if (CONNECTION_ERROR_NONE != ret)
 203         {
 204             OIC_LOG(ERROR, TAG, "connection_create failed");
 205             return CA_STATUS_FAILED;
 206         }
 207
 208         // Set callback for receiving state changes.
 209         ret = connection_set_type_changed_cb(connection, CAIPConnectionStateChangedCb, NULL);
 210         if (CONNECTION_ERROR_NONE != ret)
 211         {
 212             OIC_LOG(ERROR, TAG, "connection_set_type_changed_cb failed");
 213             return CA_STATUS_FAILED;
 214         }
 215     }
 216
 217     OIC_LOG(DEBUG, TAG, "Initialize network monitoring successfully");
 218     return CAIPSetNetworkMonitorCallback(callback, adapter);
 219 }
 220
 221 CAResult_t CAIPStopNetworkMonitor(CATransportAdapter_t adapter)
 222 {
 223     OIC_LOG(DEBUG, TAG, "IN");
 224
 225     CAIPUnSetNetworkMonitorCallback(adapter);
 226     if (!g_adapterCallbackList)
 227     {
 228         // Deinitialize Wifi service.
 229         if (WIFI_ERROR_NONE != wifi_deinitialize())
 230         {
 231             OIC_LOG(ERROR, TAG, "wifi_deinitialize failed");
 232         }
 233
 234         // Reset callback for receiving state changes.
 235         if (connection)
 236         {
 237             connection_error_e ret = connection_unset_type_changed_cb(connection);
 238             if (CONNECTION_ERROR_NONE != ret)
 239             {
 240                 OIC_LOG(ERROR, TAG, "connection_unset_type_changed_cb failed");
 241             }
 242
 243             // Deinitialize Wifi service.
 244             ret = connection_destroy(connection);
 245             if (CONNECTION_ERROR_NONE != ret)
 246             {
 247                 OIC_LOG(ERROR, TAG, "connection_destroy failed");
 248             }
 249             connection = NULL;
 250         }
 251     }
 252
 253     OIC_LOG(DEBUG, TAG, "Network monitoring terminated successfully");
 254     return CA_STATUS_OK;
 255 }
 256
 257 /**
 258  * Used to send netlink query to kernel and recv response from kernel.
 259  *
 260  * @param[in]   idx       desired network interface index, 0 means all interfaces.
 261  * @param[out]  iflist    linked list.
 262  *
 263  */
 264 static bool CAIPGetAddrInfo(int idx, u_arraylist_t *iflist)
 265 {
 266     if ((idx < 0) || (iflist == NULL))
 267     {
 268         return false;
 269     }
 270
 271     struct ifaddrs *ifp = NULL;
 272     if (-1 == getifaddrs(&ifp))
 273     {
 274         OIC_LOG_V(ERROR, TAG, "Failed to get ifaddrs: %s", strerror(errno));
 275         return false;
 276     }
 277
 278     struct ifaddrs *ifa = NULL;
 279     for (ifa = ifp; ifa; ifa = ifa->ifa_next)
 280     {
 281         if (!ifa->ifa_addr)
 282         {
 283             continue;
 284         }
 285
 286         int family = ifa->ifa_addr->sa_family;
 287         if ((ifa->ifa_flags & IFF_LOOPBACK) || (AF_INET != family && AF_INET6 != family))
 288         {
 289             continue;
 290         }
 291
 292         int ifindex = if_nametoindex(ifa->ifa_name);
 293         if (idx && (ifindex != idx))
 294         {
 295             continue;
 296         }
 297
 298         char ipaddr[MAX_ADDR_STR_SIZE_CA] = {0};
 299         if (family == AF_INET6)
 300         {
 301             struct sockaddr_in6 *in6 = (struct sockaddr_in6*) ifa->ifa_addr;
 302             inet_ntop(family, (void *)&(in6->sin6_addr), ipaddr, sizeof(ipaddr));
 303         }
 304         else if (family == AF_INET)
 305         {
 306             struct sockaddr_in *in = (struct sockaddr_in*) ifa->ifa_addr;
 307             inet_ntop(family, (void *)&(in->sin_addr), ipaddr, sizeof(ipaddr));
 308         }
 309
 310         if ((strcmp(ipaddr, IFC_ADDR_LOOP_IPV4) == 0) ||
 311             (strcmp(ipaddr, IFC_ADDR_LOOP_IPV6) == 0) ||
 312             (strcmp(ifa->ifa_name, IFC_LABEL_LOOP) == 0))
 313         {
 314             OIC_LOG(DEBUG, TAG, "LOOPBACK continue!!!");
 315             continue;
 316         }
 317
 318         CAResult_t result = CAAddInterfaceItem(iflist, ifindex,
 319                                                ifa->ifa_name, family,
 320                                                ipaddr, ifa->ifa_flags);
 321         if (CA_STATUS_OK != result)
 322         {
 323             OIC_LOG(ERROR, TAG, "CAAddInterfaceItem fail");
 324             goto exit;
 325         }
 326     }
 327     freeifaddrs(ifp);
 328     return true;
 329
 330 exit:
 331     freeifaddrs(ifp);
 332     return false;
 333 }
 334
 335 u_arraylist_t *CAIPGetInterfaceInformation(int desiredIndex)
 336 {
 337     u_arraylist_t *iflist = u_arraylist_create();
 338     if (!iflist)
 339     {
 340         OIC_LOG_V(ERROR, TAG, "Failed to create iflist: %s", strerror(errno));
 341         return NULL;
 342     }
 343
 344     if (!CAIPGetAddrInfo(desiredIndex, iflist))
 345     {
 346         goto exit;
 347     }
 348
 349     return iflist;
 350
 351 exit:
 352     u_arraylist_destroy(iflist);
 353     return NULL;
 354 }
 355
 356 static CAResult_t CAAddInterfaceItem(u_arraylist_t *iflist, int index,
 357                                      char *name, int family, const char *addr, int flags)
 358 {
 359     CAInterface_t *ifitem = CANewInterfaceItem(index, name, family, addr, flags);
 360     if (!ifitem)
 361     {
 362         return CA_STATUS_FAILED;
 363     }
 364     bool result = u_arraylist_add(iflist, ifitem);
 365     if (!result)
 366     {
 367         OIC_LOG(ERROR, TAG, "u_arraylist_add failed.");
 368         OICFree(ifitem);
 369         return CA_STATUS_FAILED;
 370     }
 371
 372     return CA_STATUS_OK;
 373 }
 374
 375 static CAInterface_t *CANewInterfaceItem(int index, char *name, int family,
 376                                          const char *addr, int flags)
 377 {
 378     CAInterface_t *ifitem = (CAInterface_t *)OICCalloc(1, sizeof (CAInterface_t));
 379     if (!ifitem)
 380     {
 381         OIC_LOG(ERROR, TAG, "Malloc failed");
 382         return NULL;
 383     }
 384
 385     OICStrcpy(ifitem->name, INTERFACE_NAME_MAX, name);
 386     ifitem->index = index;
 387     ifitem->family = family;
 388     OICStrcpy(ifitem->addr, sizeof(ifitem->addr), addr);
 389     ifitem->flags = flags;
 390
 391     return ifitem;
 392 }
 393
 394 void CAIPConnectionStateChangedCb(connection_type_e type, void* userData)
 395 {
 396     switch (type)
 397     {
 398         case CONNECTION_TYPE_DISCONNECTED:
 399             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_DISCONNECTED");
 400             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_DOWN);
 401             break;
 402         case CONNECTION_TYPE_ETHERNET:
 403             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_ETHERNET");
 404             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 405             break;
 406         case CONNECTION_TYPE_WIFI:
 407             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_WIFI");
 408             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 409             break;
 410         case CONNECTION_TYPE_CELLULAR:
 411             OIC_LOG(DEBUG, TAG, "Connection is in CONNECTION_TYPE_CELLULAR");
 412             CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 413             break;
 414         default:
 415             break;
 416     }
 417 }