/* * Copyright (C) 2008 Apple Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "NetworkStateNotifier.h" #include <wtf/MainThread.h> #include <wtf/Vector.h> #include <winsock2.h> #include <iphlpapi.h> namespace WebCore { void NetworkStateNotifier::updateState() { // Assume that we're online until proven otherwise. m_isOnLine = true; Vector<char> buffer; DWORD size = 0; if (::GetAdaptersAddresses(AF_UNSPEC, 0, 0, 0, &size) != ERROR_BUFFER_OVERFLOW) return; buffer.resize(size); PIP_ADAPTER_ADDRESSES addresses = reinterpret_cast<PIP_ADAPTER_ADDRESSES>(buffer.data()); if (::GetAdaptersAddresses(AF_UNSPEC, 0, 0, addresses, &size) != ERROR_SUCCESS) { // We couldn't determine whether we're online or not, so assume that we are. return; } for (; addresses; addresses = addresses->Next) { if (addresses->IfType == MIB_IF_TYPE_LOOPBACK) continue; if (addresses->OperStatus != IfOperStatusUp) continue; // We found an interface that was up. return; } // We didn't find any valid interfaces, so we must be offline. m_isOnLine = false; } void NetworkStateNotifier::addressChanged() { bool oldOnLine = m_isOnLine; updateState(); if (m_isOnLine == oldOnLine) return; notifyNetworkStateChange(); } void CALLBACK NetworkStateNotifier::addrChangeCallback(void* context, BOOLEAN timedOut) { NetworkStateNotifier* notifier = static_cast<NetworkStateNotifier*>(context); // NotifyAddrChange only notifies us of a single address change. Now that we've been notified, // we need to call it again so we'll get notified the *next* time. notifier->registerForAddressChange(); callOnMainThread([notifier] { notifier->addressChanged(); }); } void NetworkStateNotifier::registerForAddressChange() { HANDLE handle; ::NotifyAddrChange(&handle, &m_overlapped); } NetworkStateNotifier::NetworkStateNotifier() : m_isOnLine(false) { updateState(); memset(&m_overlapped, 0, sizeof(m_overlapped)); m_overlapped.hEvent = ::CreateEvent(0, false, false, 0); ::RegisterWaitForSingleObject(&m_waitHandle, m_overlapped.hEvent, addrChangeCallback, this, INFINITE, 0); registerForAddressChange(); } } // namespace WebCore