NetlinkManager.cpp revision 67c5753274ee828b56f96b5e9cdae64c8562ad52 
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 <errno.h>
19
20#include <sys/socket.h>
21#include <sys/select.h>
22#include <sys/time.h>
23#include <sys/types.h>
24#include <sys/un.h>
25
26#include <linux/netlink.h>
27
28#define LOG_TAG "Netd"
29
30#include <cutils/log.h>
31
32#include "NetlinkManager.h"
33#include "NetlinkHandler.h"
34
35NetlinkManager *NetlinkManager::sInstance = NULL;
36
37NetlinkManager *NetlinkManager::Instance() {
38    if (!sInstance)
39        sInstance = new NetlinkManager();
40    return sInstance;
41}
42
43NetlinkManager::NetlinkManager() {
44    mBroadcaster = NULL;
45}
46
47NetlinkManager::~NetlinkManager() {
48}
49
50int NetlinkManager::start() {
51    struct sockaddr_nl nladdr;
52    int sz = 64 * 1024;
53
54    memset(&nladdr, 0, sizeof(nladdr));
55    nladdr.nl_family = AF_NETLINK;
56    nladdr.nl_pid = getpid();
57    nladdr.nl_groups = 0xffffffff;
58
59    if ((mSock = socket(PF_NETLINK,
60                        SOCK_DGRAM,NETLINK_KOBJECT_UEVENT)) < 0) {
61        LOGE("Unable to create uevent socket: %s", strerror(errno));
62        return -1;
63    }
64
65    if (setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
66        LOGE("Unable to set uevent socket options: %s", strerror(errno));
67        return -1;
68    }
69
70    if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
71        LOGE("Unable to bind uevent socket: %s", strerror(errno));
72        return -1;
73    }
74
75    mHandler = new NetlinkHandler(this, mSock);
76    if (mHandler->start()) {
77        LOGE("Unable to start NetlinkHandler: %s", strerror(errno));
78        return -1;
79    }
80    return 0;
81}
82
83int NetlinkManager::stop() {
84    if (mHandler->stop()) {
85        LOGE("Unable to stop NetlinkHandler: %s", strerror(errno));
86        return -1;
87    }
88    delete mHandler;
89    mHandler = NULL;
90
91    close(mSock);
92    mSock = -1;
93
94    return 0;
95}
96