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#include <string.h>
20
21#include <sys/socket.h>
22#include <sys/select.h>
23#include <sys/time.h>
24#include <sys/types.h>
25#include <sys/un.h>
26
27#include <linux/netlink.h>
28
29#define LOG_TAG "Vold"
30
31#include <cutils/log.h>
32
33#include "NetlinkManager.h"
34#include "NetlinkHandler.h"
35
36NetlinkManager *NetlinkManager::sInstance = NULL;
37
38NetlinkManager *NetlinkManager::Instance() {
39    if (!sInstance)
40        sInstance = new NetlinkManager();
41    return sInstance;
42}
43
44NetlinkManager::NetlinkManager() {
45    mBroadcaster = NULL;
46}
47
48NetlinkManager::~NetlinkManager() {
49}
50
51int NetlinkManager::start() {
52    struct sockaddr_nl nladdr;
53    int sz = 64 * 1024;
54    int on = 1;
55
56    memset(&nladdr, 0, sizeof(nladdr));
57    nladdr.nl_family = AF_NETLINK;
58    nladdr.nl_pid = getpid();
59    nladdr.nl_groups = 0xffffffff;
60
61    if ((mSock = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC,
62            NETLINK_KOBJECT_UEVENT)) < 0) {
63        SLOGE("Unable to create uevent socket: %s", strerror(errno));
64        return -1;
65    }
66
67    if (setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
68        SLOGE("Unable to set uevent socket SO_RCVBUFFORCE option: %s", strerror(errno));
69        goto out;
70    }
71
72    if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
73        SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));
74        goto out;
75    }
76
77    if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
78        SLOGE("Unable to bind uevent socket: %s", strerror(errno));
79        goto out;
80    }
81
82    mHandler = new NetlinkHandler(mSock);
83    if (mHandler->start()) {
84        SLOGE("Unable to start NetlinkHandler: %s", strerror(errno));
85        goto out;
86    }
87
88    return 0;
89
90out:
91    close(mSock);
92    return -1;
93}
94
95int NetlinkManager::stop() {
96    int status = 0;
97
98    if (mHandler->stop()) {
99        SLOGE("Unable to stop NetlinkHandler: %s", strerror(errno));
100        status = -1;
101    }
102    delete mHandler;
103    mHandler = NULL;
104
105    close(mSock);
106    mSock = -1;
107
108    return status;
109}
110