path: root/NetlinkManager.cpp (plain)
blob: 177dba8c15db4d7570a2afa82660a959aa302d5c

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 "droidVold"
30
31	#include <cutils/log.h>
32
33	#include "NetlinkManager.h"
34	#include "NetlinkHandler.h"
35
36	NetlinkManager *NetlinkManager::sInstance = NULL;
37
38	NetlinkManager *NetlinkManager::Instance() {
39	if (!sInstance)
40	sInstance = new NetlinkManager();
41	return sInstance;
42	}
43
44	NetlinkManager::NetlinkManager() {
45	mBroadcaster = NULL;
46	}
47
48	NetlinkManager::~NetlinkManager() {
49	}
50
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
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