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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/network_change_notifier_linux.h"
#include <errno.h>
#include <sys/socket.h>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "net/base/net_errors.h"
#include "net/base/network_change_notifier_netlink_linux.h"
namespace net {
namespace {
const int kInvalidSocket = -1;
} // namespace
NetworkChangeNotifierLinux::NetworkChangeNotifierLinux()
: netlink_fd_(kInvalidSocket),
loop_(MessageLoopForIO::current()) {
netlink_fd_ = InitializeNetlinkSocket();
if (netlink_fd_ < 0) {
netlink_fd_ = kInvalidSocket;
return;
}
ListenForNotifications();
}
NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
if (netlink_fd_ != kInvalidSocket) {
if (close(netlink_fd_) != 0)
PLOG(ERROR) << "Failed to close socket";
netlink_fd_ = kInvalidSocket;
netlink_watcher_.StopWatchingFileDescriptor();
}
}
void NetworkChangeNotifierLinux::OnFileCanReadWithoutBlocking(int fd) {
DCHECK_EQ(fd, netlink_fd_);
ListenForNotifications();
}
void NetworkChangeNotifierLinux::OnFileCanWriteWithoutBlocking(int /* fd */) {
NOTREACHED();
}
void NetworkChangeNotifierLinux::ListenForNotifications() {
char buf[4096];
int rv = ReadNotificationMessage(buf, arraysize(buf));
while (rv > 0 ) {
if (HandleNetlinkMessage(buf, rv))
FOR_EACH_OBSERVER(Observer, observers_, OnIPAddressChanged());
rv = ReadNotificationMessage(buf, arraysize(buf));
}
if (rv == ERR_IO_PENDING) {
rv = loop_->WatchFileDescriptor(
netlink_fd_, false, MessageLoopForIO::WATCH_READ, &netlink_watcher_,
this);
LOG_IF(ERROR, !rv) << "Failed to watch netlink socket: " << netlink_fd_;
}
}
int NetworkChangeNotifierLinux::ReadNotificationMessage(char* buf, size_t len) {
DCHECK_NE(len, 0u);
DCHECK(buf);
memset(buf, 0, sizeof(buf));
int rv = recv(netlink_fd_, buf, len, 0);
if (rv > 0) {
return rv;
} else {
DCHECK_NE(rv, 0);
if (errno != EAGAIN && errno != EWOULDBLOCK) {
PLOG(DFATAL) << "recv";
return ERR_FAILED;
}
return ERR_IO_PENDING;
}
}
} // namespace net
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