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
35 NetlinkManager *NetlinkManager::sInstance = NULL;
36
Instance()37 NetlinkManager *NetlinkManager::Instance() {
38 if (!sInstance)
39 sInstance = new NetlinkManager();
40 return sInstance;
41 }
42
NetlinkManager()43 NetlinkManager::NetlinkManager() {
44 mBroadcaster = NULL;
45 }
46
~NetlinkManager()47 NetlinkManager::~NetlinkManager() {
48 }
49
start()50 int 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_RCVBUFFORCE option: %s", strerror(errno));
68 goto out;
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 goto out;
74 }
75
76 if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
77 SLOGE("Unable to bind uevent socket: %s", strerror(errno));
78 goto out;
79 }
80
81 mHandler = new NetlinkHandler(mSock);
82 if (mHandler->start()) {
83 SLOGE("Unable to start NetlinkHandler: %s", strerror(errno));
84 goto out;
85 }
86
87 return 0;
88
89 out:
90 close(mSock);
91 return -1;
92 }
93
stop()94 int NetlinkManager::stop() {
95 int status = 0;
96
97 if (mHandler->stop()) {
98 SLOGE("Unable to stop NetlinkHandler: %s", strerror(errno));
99 status = -1;
100 }
101 delete mHandler;
102 mHandler = NULL;
103
104 close(mSock);
105 mSock = -1;
106
107 return status;
108 }
109