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 "caipinterface.h"
  22
  23 #include <sys/types.h>
  24 #include <ifaddrs.h>
  25 #include <net/if.h>
  26 #include <sys/socket.h>
  27 #include <netdb.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <sys/ioctl.h>
  32 #include <wifi.h>
  33 #include <linux/netlink.h>
  34 #include <linux/rtnetlink.h>
  35 #include <arpa/inet.h>
  36 #include <netinet/in.h>
  37
  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 "IP_MONITOR"
  46
  47 #define MAX_INTERFACE_INFO_LENGTH (1024)
  48
  49 #define NETLINK_MESSAGE_LENGTH  (4096)
  50
  51 /**
  52  * Used to storing adapter changes callback interface.
  53  */
  54 static struct CAIPCBData_t *g_adapterCallbackList = NULL;
  55
  56 /**
  57  * Create new interface item.
  58  */
  59 static CAInterface_t *CANewInterfaceItem(int index, char *name, int family,
  60                                          const char *addr, int flags);
  61
  62 /**
  63  * Add new network interface in list.
  64  */
  65 static CAResult_t CAAddInterfaceItem(u_arraylist_t *iflist, int index,
  66                                      char *name, int family, const char *addr, int flags);
  67
  68 /**
  69  * Pass the changed network status through the stored callback.
  70  */
  71 static void CAIPPassNetworkChangesToAdapter(CANetworkStatus_t status);
  72
  73 /**
  74  * Callback function to received connection state changes.
  75  */
  76 static void CAWIFIConnectionStateChangedCb(wifi_connection_state_e state, wifi_ap_h ap,
  77                                            void *userData);
  78
  79 /**
  80  * Callback function to received device state changes.
  81  */
  82 static void CAWIFIDeviceStateChangedCb(wifi_device_state_e state, void *userData);
  83
  84
  85 int CAGetPollingInterval(int interval)
  86 {
  87     return interval;
  88 }
  89
  90 static void CAIPPassNetworkChangesToAdapter(CANetworkStatus_t status)
  91 {
  92     CAIPCBData_t *cbitem = NULL;
  93     LL_FOREACH(g_adapterCallbackList, cbitem)
  94     {
  95         if (cbitem && cbitem->adapter)
  96         {
  97             cbitem->callback(cbitem->adapter, status);
  98         }
  99     }
 100 }
 101
 102 CAResult_t CAIPSetNetworkMonitorCallback(CAIPAdapterStateChangeCallback callback,
 103                                          CATransportAdapter_t adapter)
 104 {
 105     if (!callback)
 106     {
 107         OIC_LOG(ERROR, TAG, "callback is null");
 108         return CA_STATUS_INVALID_PARAM;
 109     }
 110
 111     CAIPCBData_t *cbitem = NULL;
 112     LL_FOREACH(g_adapterCallbackList, cbitem)
 113     {
 114         if (cbitem && adapter == cbitem->adapter && callback == cbitem->callback)
 115         {
 116             OIC_LOG(DEBUG, TAG, "this callback is already added");
 117             return CA_STATUS_OK;
 118         }
 119     }
 120
 121     cbitem = (CAIPCBData_t *)OICCalloc(1, sizeof(*cbitem));
 122     if (!cbitem)
 123     {
 124         OIC_LOG(ERROR, TAG, "Malloc failed");
 125         return CA_STATUS_FAILED;
 126     }
 127
 128     cbitem->adapter = adapter;
 129     cbitem->callback = callback;
 130     LL_APPEND(g_adapterCallbackList, cbitem);
 131
 132     return CA_STATUS_OK;
 133 }
 134
 135 CAResult_t CAIPUnSetNetworkMonitorCallback(CATransportAdapter_t adapter)
 136 {
 137     CAIPCBData_t *cbitem = NULL;
 138     CAIPCBData_t *tmpCbitem = NULL;
 139     LL_FOREACH_SAFE(g_adapterCallbackList, cbitem, tmpCbitem)
 140     {
 141         if (cbitem && adapter == cbitem->adapter)
 142         {
 143             OIC_LOG(DEBUG, TAG, "remove specific callback");
 144             LL_DELETE(g_adapterCallbackList, cbitem);
 145             OICFree(cbitem);
 146             return CA_STATUS_OK;
 147         }
 148     }
 149     return CA_STATUS_OK;
 150 }
 151
 152 u_arraylist_t *CAFindInterfaceChange()
 153 {
 154     u_arraylist_t *iflist = NULL;
 155     char buf[NETLINK_MESSAGE_LENGTH] = { 0 };
 156     struct sockaddr_nl sa = { 0 };
 157     struct iovec iov = { .iov_base = buf,
 158                          .iov_len = sizeof (buf) };
 159     struct msghdr msg = { .msg_name = (void *)&sa,
 160                           .msg_namelen = sizeof (sa),
 161                           .msg_iov = &iov,
 162                           .msg_iovlen = 1 };
 163
 164     size_t len = recvmsg(caglobals.ip.netlinkFd, &msg, 0);
 165
 166     for (struct nlmsghdr *nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len); nh = NLMSG_NEXT(nh, len))
 167     {
 168         if (nh != NULL && nh->nlmsg_type != RTM_NEWLINK)
 169         {
 170             continue;
 171         }
 172
 173         struct ifinfomsg *ifi = (struct ifinfomsg *)NLMSG_DATA(nh);
 174
 175         if ((!ifi || (ifi->ifi_flags & IFF_LOOPBACK) || !(ifi->ifi_flags & IFF_RUNNING)))
 176         {
 177             continue;
 178         }
 179
 180         int ifiIndex = ifi->ifi_index;
 181         iflist = CAIPGetInterfaceInformation(ifiIndex);
 182
 183         if (!iflist)
 184         {
 185             OIC_LOG_V(ERROR, TAG, "get interface info failed: %s", strerror(errno));
 186             return NULL;
 187         }
 188     }
 189     return iflist;
 190 }
 191
 192 CAResult_t CAIPStartNetworkMonitor(CAIPAdapterStateChangeCallback callback,
 193                                    CATransportAdapter_t adapter)
 194 {
 195     OIC_LOG(DEBUG, TAG, "IN");
 196
 197     if (!g_adapterCallbackList)
 198     {
 199         // Initialize Wifi service
 200        wifi_error_e ret = wifi_initialize();
 201        if (WIFI_ERROR_NONE != ret)
 202        {
 203            OIC_LOG(ERROR, TAG, "wifi_initialize failed");
 204            return CA_STATUS_FAILED;
 205        }
 206
 207        // Set callback for receiving state changes
 208        ret = wifi_set_device_state_changed_cb(CAWIFIDeviceStateChangedCb, NULL);
 209        if (WIFI_ERROR_NONE != ret)
 210        {
 211            OIC_LOG(ERROR, TAG, "wifi_set_device_state_changed_cb failed");
 212            return CA_STATUS_FAILED;
 213        }
 214
 215        // Set callback for receiving connection state changes
 216        ret = wifi_set_connection_state_changed_cb(CAWIFIConnectionStateChangedCb, NULL);
 217        if (WIFI_ERROR_NONE != ret)
 218        {
 219            OIC_LOG(ERROR, TAG, "wifi_set_connection_state_changed_cb failed");
 220            return CA_STATUS_FAILED;
 221        }
 222     }
 223
 224     return CAIPSetNetworkMonitorCallback(callback, adapter);
 225 }
 226
 227 CAResult_t CAIPStopNetworkMonitor(CATransportAdapter_t adapter)
 228 {
 229     OIC_LOG(DEBUG, TAG, "IN");
 230
 231     CAIPUnSetNetworkMonitorCallback(adapter);
 232     if (!g_adapterCallbackList)
 233     {
 234         // Reset callback for receiving state changes
 235        wifi_error_e ret = wifi_unset_device_state_changed_cb();
 236        if (WIFI_ERROR_NONE != ret)
 237        {
 238            OIC_LOG(ERROR, TAG, "wifi_unset_device_state_changed_cb failed");
 239        }
 240
 241        // Reset callback for receiving connection state changes
 242        ret = wifi_unset_connection_state_changed_cb();
 243        if (WIFI_ERROR_NONE != ret)
 244        {
 245            OIC_LOG(ERROR, TAG, "wifi_unset_connection_state_changed_cb failed");
 246        }
 247
 248        // Deinitialize Wifi service
 249        ret = wifi_deinitialize();
 250        if (WIFI_ERROR_NONE != ret)
 251        {
 252            OIC_LOG(ERROR, TAG, "wifi_deinitialize failed");
 253        }
 254     }
 255
 256     return CA_STATUS_OK;
 257 }
 258
 259 u_arraylist_t *CAIPGetInterfaceInformation(int desiredIndex)
 260 {
 261     u_arraylist_t *iflist = u_arraylist_create();
 262     if (!iflist)
 263     {
 264         OIC_LOG_V(ERROR, TAG, "Failed to create iflist: %s", strerror(errno));
 265         return NULL;
 266     }
 267
 268     char buf[MAX_INTERFACE_INFO_LENGTH] = { 0 };
 269     struct ifconf ifc = { .ifc_len = MAX_INTERFACE_INFO_LENGTH, .ifc_buf = buf };
 270
 271     int s = caglobals.ip.u6.fd != -1 ? caglobals.ip.u6.fd : caglobals.ip.u4.fd;
 272     if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
 273     {
 274         OIC_LOG_V(ERROR, TAG, "SIOCGIFCONF failed: %s", strerror(errno));
 275         u_arraylist_destroy(iflist);
 276         return NULL;
 277     }
 278
 279     struct ifreq* ifr = ifc.ifc_req;
 280     size_t interfaces = ifc.ifc_len / sizeof (ifc.ifc_req[0]);
 281     size_t ifreqsize = ifc.ifc_len;
 282
 283     if (ifreqsize > caglobals.ip.nm.sizeIfItems)
 284     {
 285         CAIfItem_t *items = (CAIfItem_t *)OICRealloc(caglobals.ip.nm.ifItems, ifreqsize);
 286         if (!items)
 287         {
 288             OIC_LOG(ERROR, TAG, "OICRealloc failed");
 289             goto exit;
 290         }
 291         caglobals.ip.nm.ifItems = items;
 292         caglobals.ip.nm.sizeIfItems = ifreqsize;
 293     }
 294
 295     caglobals.ip.nm.numIfItems = 0;
 296     for (size_t i = 0; i < interfaces; i++)
 297     {
 298         struct ifreq* item = &ifr[i];
 299         char *name = item->ifr_name;
 300
 301         if (ioctl(s, SIOCGIFFLAGS, item) < 0)
 302         {
 303             OIC_LOG_V(ERROR, TAG, "SIOCGIFFLAGS failed: %s", strerror(errno));
 304             continue;
 305         }
 306         int16_t flags = item->ifr_flags;
 307         if ((flags & IFF_LOOPBACK) || !(flags & IFF_RUNNING))
 308         {
 309             continue;
 310         }
 311         if (ioctl(s, SIOCGIFINDEX, item) < 0)
 312         {
 313             OIC_LOG_V(ERROR, TAG, "SIOCGIFINDEX failed: %s", strerror(errno));
 314             continue;
 315         }
 316
 317         int ifindex = item->ifr_ifindex;
 318         caglobals.ip.nm.ifItems[i].ifIndex = ifindex;
 319         caglobals.ip.nm.numIfItems++;
 320
 321         if (desiredIndex && (ifindex != desiredIndex))
 322         {
 323             continue;
 324         }
 325
 326         // Get address of network interface.
 327         char addr[MAX_ADDR_STR_SIZE_CA] = { 0 };
 328         struct sockaddr_in *sa = (struct sockaddr_in *)&item->ifr_addr;
 329         inet_ntop(AF_INET, (void *)&(sa->sin_addr), addr, sizeof(addr));
 330
 331         // Add IPv4 interface
 332         CAResult_t result = CAAddInterfaceItem(iflist, ifindex, name, AF_INET, addr, flags);
 333         if (CA_STATUS_OK != result)
 334         {
 335             goto exit;
 336         }
 337
 338         // Add IPv6 interface
 339         result = CAAddInterfaceItem(iflist, ifindex, name, AF_INET6, addr, flags);
 340         if (CA_STATUS_OK != result)
 341         {
 342             goto exit;
 343         }
 344     }
 345     return iflist;
 346
 347 exit:
 348     u_arraylist_destroy(iflist);
 349     return NULL;
 350 }
 351
 352 static CAResult_t CAAddInterfaceItem(u_arraylist_t *iflist, int index,
 353                                      char *name, int family, const char *addr, int flags)
 354 {
 355     CAInterface_t *ifitem = CANewInterfaceItem(index, name, family, addr, flags);
 356     if (!ifitem)
 357     {
 358         return CA_STATUS_FAILED;
 359     }
 360     bool result = u_arraylist_add(iflist, ifitem);
 361     if (!result)
 362     {
 363         OIC_LOG(ERROR, TAG, "u_arraylist_add failed.");
 364         OICFree(ifitem);
 365         return CA_STATUS_FAILED;
 366     }
 367
 368     return CA_STATUS_OK;
 369 }
 370
 371 static CAInterface_t *CANewInterfaceItem(int index, char *name, int family,
 372                                          const char *addr, int flags)
 373 {
 374     CAInterface_t *ifitem = (CAInterface_t *)OICCalloc(1, sizeof (CAInterface_t));
 375     if (!ifitem)
 376     {
 377         OIC_LOG(ERROR, TAG, "Malloc failed");
 378         return NULL;
 379     }
 380
 381     OICStrcpy(ifitem->name, INTERFACE_NAME_MAX, name);
 382     ifitem->index = index;
 383     ifitem->family = family;
 384     OICStrcpy(ifitem->addr, sizeof(ifitem->addr), addr);
 385     ifitem->flags = flags;
 386
 387     return ifitem;
 388 }
 389
 390 void CAWIFIConnectionStateChangedCb(wifi_connection_state_e state, wifi_ap_h ap,
 391                                     void *userData)
 392 {
 393     OIC_LOG(DEBUG, TAG, "IN");
 394
 395     if (WIFI_CONNECTION_STATE_ASSOCIATION == state
 396         || WIFI_CONNECTION_STATE_CONFIGURATION == state)
 397     {
 398         OIC_LOG(DEBUG, TAG, "Connection is in Association State");
 399         return;
 400     }
 401
 402     if (WIFI_CONNECTION_STATE_CONNECTED == state)
 403     {
 404         CAIPPassNetworkChangesToAdapter(CA_INTERFACE_UP);
 405     }
 406     else
 407     {
 408         CAIPPassNetworkChangesToAdapter(CA_INTERFACE_DOWN);
 409     }
 410
 411     OIC_LOG(DEBUG, TAG, "OUT");
 412 }
 413
 414 void CAWIFIDeviceStateChangedCb(wifi_device_state_e state, void *userData)
 415 {
 416     OIC_LOG(DEBUG, TAG, "IN");
 417
 418     if (WIFI_DEVICE_STATE_ACTIVATED == state)
 419     {
 420         OIC_LOG(DEBUG, TAG, "Wifi is in Activated State");
 421     }
 422     else
 423     {
 424         CAWIFIConnectionStateChangedCb(WIFI_CONNECTION_STATE_DISCONNECTED, NULL, NULL);
 425         OIC_LOG(DEBUG, TAG, "Wifi is in Deactivated State");
 426     }
 427
 428     OIC_LOG(DEBUG, TAG, "OUT");
 429 }