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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <stdio.h>
     18 #include <stdlib.h>
     19 #include <errno.h>
     20 
     21 #define LOG_TAG "Netd"
     22 
     23 #include <cutils/log.h>
     24 
     25 #include <sysutils/NetlinkEvent.h>
     26 #include "NetlinkHandler.h"
     27 #include "NetlinkManager.h"
     28 #include "ResponseCode.h"
     29 
     30 NetlinkHandler::NetlinkHandler(NetlinkManager *nm, int listenerSocket) :
     31                 NetlinkListener(listenerSocket) {
     32     mNm = nm;
     33 }
     34 
     35 NetlinkHandler::~NetlinkHandler() {
     36 }
     37 
     38 int NetlinkHandler::start() {
     39     return this->startListener();
     40 }
     41 
     42 int NetlinkHandler::stop() {
     43     return this->stopListener();
     44 }
     45 
     46 void NetlinkHandler::onEvent(NetlinkEvent *evt) {
     47     const char *subsys = evt->getSubsystem();
     48     if (!subsys) {
     49         LOGW("No subsystem found in netlink event");
     50         return;
     51     }
     52     if (!strcmp(subsys, "net")) {
     53         int action = evt->getAction();
     54         if (action == evt->NlActionAdd) {
     55             const char *iface = evt->findParam("INTERFACE");
     56             notifyInterfaceAdded(iface);
     57         } else if (action == evt->NlActionRemove) {
     58             const char *iface = evt->findParam("INTERFACE");
     59             notifyInterfaceRemoved(iface);
     60         } else if (action == evt->NlActionChange) {
     61             evt->dump();
     62             const char *iface = evt->findParam("INTERFACE");
     63             notifyInterfaceChanged("nana", true);
     64         }
     65     }
     66 }
     67 
     68 void NetlinkHandler::notifyInterfaceAdded(const char *name) {
     69     char msg[255];
     70     snprintf(msg, sizeof(msg), "Iface added %s", name);
     71 
     72     mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
     73             msg, false);
     74 }
     75 
     76 void NetlinkHandler::notifyInterfaceRemoved(const char *name) {
     77     char msg[255];
     78     snprintf(msg, sizeof(msg), "Iface removed %s", name);
     79 
     80     mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
     81             msg, false);
     82 }
     83 
     84 void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) {
     85     char msg[255];
     86     snprintf(msg, sizeof(msg), "Iface is %s %s", (isUp ? "up" : "down"), name);
     87 
     88     mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
     89             msg, false);
     90 }
     91