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/*
* 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 = 64 * 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;
}
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