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
36 NetlinkManager *NetlinkManager::sInstance = NULL;
37
Instance()38 NetlinkManager *NetlinkManager::Instance() {
39 if (!sInstance)
40 sInstance = new NetlinkManager();
41 return sInstance;
42 }
43
NetlinkManager()44 NetlinkManager::NetlinkManager() {
45 mBroadcaster = NULL;
46 }
47
~NetlinkManager()48 NetlinkManager::~NetlinkManager() {
49 }
50
start()51 int 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
90 out:
91 close(mSock);
92 return -1;
93 }
94
stop()95 int 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