1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "NetworkStateNotifier.h"
28
29#include <wtf/MainThread.h>
30#include <wtf/Vector.h>
31
32#include <winsock2.h>
33#include <iphlpapi.h>
34
35namespace WebCore {
36
37void NetworkStateNotifier::updateState()
38{
39    // Assume that we're online until proven otherwise.
40    m_isOnLine = true;
41
42    Vector<char> buffer;
43    DWORD size = 0;
44
45    if (::GetAdaptersAddresses(AF_UNSPEC, 0, 0, 0, &size) != ERROR_BUFFER_OVERFLOW)
46        return;
47
48    buffer.resize(size);
49    PIP_ADAPTER_ADDRESSES addresses = reinterpret_cast<PIP_ADAPTER_ADDRESSES>(buffer.data());
50
51    if (::GetAdaptersAddresses(AF_UNSPEC, 0, 0, addresses, &size) != ERROR_SUCCESS) {
52        // We couldn't determine whether we're online or not, so assume that we are.
53        return;
54    }
55
56    for (; addresses; addresses = addresses->Next) {
57        if (addresses->IfType == MIB_IF_TYPE_LOOPBACK)
58            continue;
59
60        if (addresses->OperStatus != IfOperStatusUp)
61            continue;
62
63        // We found an interface that was up.
64        return;
65    }
66
67    // We didn't find any valid interfaces, so we must be offline.
68    m_isOnLine = false;
69}
70
71void NetworkStateNotifier::addressChanged()
72{
73    bool oldOnLine = m_isOnLine;
74
75    updateState();
76
77    if (m_isOnLine == oldOnLine)
78        return;
79
80    if (m_networkStateChangedFunction)
81        m_networkStateChangedFunction();
82}
83
84void NetworkStateNotifier::callAddressChanged(void* context)
85{
86    static_cast<NetworkStateNotifier*>(context)->addressChanged();
87}
88
89void CALLBACK NetworkStateNotifier::addrChangeCallback(void* context, BOOLEAN timedOut)
90{
91    // NotifyAddrChange only notifies us of a single address change. Now that we've been notified,
92    // we need to call it again so we'll get notified the *next* time.
93    static_cast<NetworkStateNotifier*>(context)->registerForAddressChange();
94
95    callOnMainThread(callAddressChanged, context);
96}
97
98void NetworkStateNotifier::registerForAddressChange()
99{
100    HANDLE handle;
101    ::NotifyAddrChange(&handle, &m_overlapped);
102}
103
104NetworkStateNotifier::NetworkStateNotifier()
105    : m_isOnLine(false)
106    , m_networkStateChangedFunction(0)
107{
108    updateState();
109
110    memset(&m_overlapped, 0, sizeof(m_overlapped));
111
112// FIXME: Check m_overlapped on WinCE.
113#if !OS(WINCE)
114    m_overlapped.hEvent = ::CreateEvent(0, false, false, 0);
115
116    ::RegisterWaitForSingleObject(&m_waitHandle, m_overlapped.hEvent, addrChangeCallback, this, INFINITE, 0);
117
118    registerForAddressChange();
119#endif
120}
121
122} // namespace WebCore
123