/*

* Copyright (C) 2008 The Android Open Source Project

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <sys/select.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <sys/types.h>

#include <sys/un.h>

#include <linux/netlink.h>

#include <android-base/logging.h>

#include "NetlinkHandler.h"

#include "NetlinkManager.h"

NetlinkManager* NetlinkManager::sInstance = NULL;

NetlinkManager* NetlinkManager::Instance() {

if (!sInstance) sInstance = new NetlinkManager();

return sInstance;

}

NetlinkManager::NetlinkManager() {

mBroadcaster = NULL;

}

NetlinkManager::~NetlinkManager() {}

int NetlinkManager::start() {

struct sockaddr_nl nladdr;

int sz = 256 * 1024;

int on = 1;

memset(&nladdr, 0, sizeof(nladdr));

nladdr.nl_family = AF_NETLINK;

nladdr.nl_pid = getpid();

nladdr.nl_groups = 0xffffffff;

if ((mSock = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) < 0) {

PLOG(ERROR) << "Unable to create uevent socket";

return -1;

}

// When running in a net/user namespace, SO_RCVBUFFORCE will fail because

// it will check for the CAP_NET_ADMIN capability in the root namespace.

// Try using SO_RCVBUF if that fails.

if ((setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) &&

(setsockopt(mSock, SOL_SOCKET, SO_RCVBUF, &sz, sizeof(sz)) < 0)) {

PLOG(ERROR) << "Unable to set uevent socket SO_RCVBUF/SO_RCVBUFFORCE option";

goto out;

}

if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {

PLOG(ERROR) << "Unable to set uevent socket SO_PASSCRED option";

goto out;

}

if (bind(mSock, (struct sockaddr*)&nladdr, sizeof(nladdr)) < 0) {

PLOG(ERROR) << "Unable to bind uevent socket";

goto out;

}

mHandler = new NetlinkHandler(mSock);

if (mHandler->start()) {

PLOG(ERROR) << "Unable to start NetlinkHandler";

goto out;

}

return 0;

out:

close(mSock);

return -1;

}