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/*
* Copyright (C) 2008 Collin Jackson <collinj@webkit.org>
* Copyright (C) 2009 Apple Inc. All Rights Reserved.
* Copyright (C) 2012 Igalia S.L.
*
* 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 AND ITS CONTRIBUTORS "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 COMPUTER, 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 "DNS.h"
#include "DNSResolveQueue.h"
#include "KURL.h"
#include "Timer.h"
#include <wtf/HashSet.h>
#include <wtf/MainThread.h>
#include <wtf/RetainPtr.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringHash.h>
#if PLATFORM(WIN)
#include "LoaderRunLoopCF.h"
#include <CFNetwork/CFNetwork.h>
#endif
#if PLATFORM(MAC) && !PLATFORM(IOS) && __MAC_OS_X_VERSION_MIN_REQUIRED == 1050
#include <SystemConfiguration/SystemConfiguration.h>
#endif
namespace WebCore {
bool DNSResolveQueue::platformProxyIsEnabledInSystemPreferences()
{
// Don't do DNS prefetch if proxies are involved. For many proxy types, the user agent is never exposed
// to the IP address during normal operation. Querying an internal DNS server may not help performance,
// as it doesn't necessarily look up the actual external IP. Also, if DNS returns a fake internal address,
// local caches may keep it even after re-connecting to another network.
#if !PLATFORM(MAC) || PLATFORM(IOS) || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
RetainPtr<CFDictionaryRef> proxySettings(AdoptCF, CFNetworkCopySystemProxySettings());
#else
RetainPtr<CFDictionaryRef> proxySettings(AdoptCF, SCDynamicStoreCopyProxies(0));
#endif
if (!proxySettings)
return false;
static CFURLRef httpCFURL = KURL(ParsedURLString, "http://example.com/").createCFURL();
static CFURLRef httpsCFURL = KURL(ParsedURLString, "https://example.com/").createCFURL();
RetainPtr<CFArrayRef> httpProxyArray(AdoptCF, CFNetworkCopyProxiesForURL(httpCFURL, proxySettings.get()));
RetainPtr<CFArrayRef> httpsProxyArray(AdoptCF, CFNetworkCopyProxiesForURL(httpsCFURL, proxySettings.get()));
CFIndex httpProxyCount = CFArrayGetCount(httpProxyArray.get());
CFIndex httpsProxyCount = CFArrayGetCount(httpsProxyArray.get());
if (httpProxyCount == 1 && CFEqual(CFDictionaryGetValue(static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex(httpProxyArray.get(), 0)), kCFProxyTypeKey), kCFProxyTypeNone))
httpProxyCount = 0;
if (httpsProxyCount == 1 && CFEqual(CFDictionaryGetValue(static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex(httpsProxyArray.get(), 0)), kCFProxyTypeKey), kCFProxyTypeNone))
httpsProxyCount = 0;
return httpProxyCount || httpsProxyCount;
}
static void clientCallback(CFHostRef theHost, CFHostInfoType, const CFStreamError*, void*)
{
DNSResolveQueue::shared().decrementRequestCount(); // It's ok to call shared() from a secondary thread, the static variable has already been initialized by now.
CFRelease(theHost);
}
void DNSResolveQueue::platformResolve(const String& hostname)
{
ASSERT(isMainThread());
RetainPtr<CFStringRef> hostnameCF(AdoptCF, hostname.createCFString());
RetainPtr<CFHostRef> host(AdoptCF, CFHostCreateWithName(0, hostnameCF.get()));
if (!host) {
decrementRequestCount();
return;
}
CFHostClientContext context = { 0, 0, 0, 0, 0 };
CFHostRef leakedHost = host.leakRef(); // The host will be released from clientCallback().
Boolean result = CFHostSetClient(leakedHost, clientCallback, &context);
ASSERT_UNUSED(result, result);
#if !PLATFORM(WIN)
CFHostScheduleWithRunLoop(leakedHost, CFRunLoopGetMain(), kCFRunLoopCommonModes);
#else
// On Windows, we run a separate thread with CFRunLoop, which is where clientCallback will be called.
CFHostScheduleWithRunLoop(leakedHost, loaderRunLoop(), kCFRunLoopDefaultMode);
#endif
CFHostStartInfoResolution(leakedHost, kCFHostAddresses, 0);
}
void prefetchDNS(const String& hostname)
{
ASSERT(isMainThread());
if (hostname.isEmpty())
return;
DNSResolveQueue::shared().add(hostname);
}
}
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