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 "Vold"
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    int on = 1;
54
55    memset(&nladdr, 0, sizeof(nladdr));
56    nladdr.nl_family = AF_NETLINK;
57    nladdr.nl_pid = getpid();
58    nladdr.nl_groups = 0xffffffff;
59
60    if ((mSock = socket(PF_NETLINK,
61                        SOCK_DGRAM,NETLINK_KOBJECT_UEVENT)) < 0) {
62        SLOGE("Unable to create uevent socket: %s", strerror(errno));
63        return -1;
64    }
65
66    if (setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
67        SLOGE("Unable to set uevent socket SO_RECBUFFORCE option: %s", strerror(errno));
68        return -1;
69    }
70
71    if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
72        SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));
73        return -1;
74    }
75
76    if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
77        SLOGE("Unable to bind uevent socket: %s", strerror(errno));
78        return -1;
79    }
80
81    mHandler = new NetlinkHandler(mSock);
82    if (mHandler->start()) {
83        SLOGE("Unable to start NetlinkHandler: %s", strerror(errno));
84        return -1;
85    }
86    return 0;
87}
88
89int NetlinkManager::stop() {
90    if (mHandler->stop()) {
91        SLOGE("Unable to stop NetlinkHandler: %s", strerror(errno));
92        return -1;
93    }
94    delete mHandler;
95    mHandler = NULL;
96
97    close(mSock);
98    mSock = -1;
99
100    return 0;
101}
102