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fune/dom/html/nsHTMLDNSPrefetch.cpp
Kristen Wright dacc355ec3 Bug 1572505 - Convert network.dns.disablePrefetchFromHTTPS to static pref. r=smaug,njn 
Converts network.dns.disablePrefetchFromHTTPS to a static pref. Though the original VarCache pref default to `false`, it looks like the intended value is `true`. (see comment #0 in bug 1572505)

Differential Revision: https://phabricator.services.mozilla.com/D42737

--HG--
extra : moz-landing-system : lando
2019-08-21 10:11:04 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "base/basictypes.h"
#include "mozilla/net/NeckoCommon.h"
#include "mozilla/net/NeckoChild.h"
#include "nsURLHelper.h"
#include "nsHTMLDNSPrefetch.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsIProtocolHandler.h"
#include "nsIDNSListener.h"
#include "nsIWebProgressListener.h"
#include "nsIWebProgress.h"
#include "nsIDNSRecord.h"
#include "nsIDNSService.h"
#include "nsICancelable.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/Document.h"
#include "nsThreadUtils.h"
#include "nsITimer.h"
#include "nsIObserverService.h"
#include "mozilla/dom/Link.h"
#include "mozilla/Components.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::net;
static NS_DEFINE_CID(kDNSServiceCID, NS_DNSSERVICE_CID);
static bool sInitialized = false;
static nsIDNSService* sDNSService = nullptr;
static nsHTMLDNSPrefetch::nsDeferrals* sPrefetches = nullptr;
static nsHTMLDNSPrefetch::nsListener* sDNSListener = nullptr;
bool sEsniEnabled;
nsresult nsHTMLDNSPrefetch::Initialize() {
if (sInitialized) {
NS_WARNING("Initialize() called twice");
return NS_OK;
}
sPrefetches = new nsHTMLDNSPrefetch::nsDeferrals();
NS_ADDREF(sPrefetches);
sDNSListener = new nsHTMLDNSPrefetch::nsListener();
NS_ADDREF(sDNSListener);
sPrefetches->Activate();
Preferences::AddBoolVarCache(&sEsniEnabled, "network.security.esni.enabled");
sEsniEnabled = Preferences::GetBool("network.security.esni.enabled", false);
NS_IF_RELEASE(sDNSService);
nsresult rv;
rv = CallGetService(kDNSServiceCID, &sDNSService);
if (NS_FAILED(rv)) return rv;
if (IsNeckoChild()) NeckoChild::InitNeckoChild();
sInitialized = true;
return NS_OK;
}
nsresult nsHTMLDNSPrefetch::Shutdown() {
if (!sInitialized) {
NS_WARNING("Not Initialized");
return NS_OK;
}
sInitialized = false;
NS_IF_RELEASE(sDNSService);
NS_IF_RELEASE(sPrefetches);
NS_IF_RELEASE(sDNSListener);
return NS_OK;
}
bool nsHTMLDNSPrefetch::IsAllowed(Document* aDocument) {
// There is no need to do prefetch on non UI scenarios such as XMLHttpRequest.
return aDocument->IsDNSPrefetchAllowed() && aDocument->GetWindow();
}
nsresult nsHTMLDNSPrefetch::Prefetch(Link* aElement, uint16_t flags) {
if (!(sInitialized && sPrefetches && sDNSService && sDNSListener))
return NS_ERROR_NOT_AVAILABLE;
return sPrefetches->Add(flags, aElement);
}
nsresult nsHTMLDNSPrefetch::PrefetchLow(Link* aElement) {
return Prefetch(aElement, nsIDNSService::RESOLVE_PRIORITY_LOW);
}
nsresult nsHTMLDNSPrefetch::PrefetchMedium(Link* aElement) {
return Prefetch(aElement, nsIDNSService::RESOLVE_PRIORITY_MEDIUM);
}
nsresult nsHTMLDNSPrefetch::PrefetchHigh(Link* aElement) {
return Prefetch(aElement, 0);
}
nsresult nsHTMLDNSPrefetch::Prefetch(const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes,
uint16_t flags) {
if (IsNeckoChild()) {
// We need to check IsEmpty() because net_IsValidHostName()
// considers empty strings to be valid hostnames
if (!hostname.IsEmpty() &&
net_IsValidHostName(NS_ConvertUTF16toUTF8(hostname))) {
// during shutdown gNeckoChild might be null
if (gNeckoChild) {
gNeckoChild->SendHTMLDNSPrefetch(nsString(hostname), isHttps,
aOriginAttributes, flags);
}
}
return NS_OK;
}
if (!(sInitialized && sDNSService && sPrefetches && sDNSListener))
return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsICancelable> tmpOutstanding;
nsresult rv = sDNSService->AsyncResolveNative(
NS_ConvertUTF16toUTF8(hostname), flags | nsIDNSService::RESOLVE_SPECULATE,
sDNSListener, nullptr, aOriginAttributes, getter_AddRefs(tmpOutstanding));
if (NS_FAILED(rv)) {
return rv;
}
// Fetch ESNI keys if needed.
if (isHttps && sEsniEnabled) {
nsAutoCString esniHost;
esniHost.Append("_esni.");
esniHost.Append(NS_ConvertUTF16toUTF8(hostname));
Unused << sDNSService->AsyncResolveByTypeNative(
esniHost, nsIDNSService::RESOLVE_TYPE_TXT,
flags | nsIDNSService::RESOLVE_SPECULATE, sDNSListener, nullptr,
aOriginAttributes, getter_AddRefs(tmpOutstanding));
}
return NS_OK;
}
nsresult nsHTMLDNSPrefetch::PrefetchLow(
const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes) {
return Prefetch(hostname, isHttps, aOriginAttributes,
nsIDNSService::RESOLVE_PRIORITY_LOW);
}
nsresult nsHTMLDNSPrefetch::PrefetchMedium(
const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes) {
return Prefetch(hostname, isHttps, aOriginAttributes,
nsIDNSService::RESOLVE_PRIORITY_MEDIUM);
}
nsresult nsHTMLDNSPrefetch::PrefetchHigh(
const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes) {
return Prefetch(hostname, isHttps, aOriginAttributes, 0);
}
nsresult nsHTMLDNSPrefetch::CancelPrefetch(Link* aElement, uint16_t flags,
nsresult aReason) {
if (!(sInitialized && sPrefetches && sDNSService && sDNSListener))
return NS_ERROR_NOT_AVAILABLE;
nsAutoString hostname;
aElement->GetHostname(hostname);
Element* element = aElement->GetElement();
NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
nsAutoString protocol;
aElement->GetProtocol(protocol);
bool isHttps = false;
if (protocol.EqualsLiteral("https:")) {
isHttps = true;
}
return CancelPrefetch(hostname, isHttps,
element->NodePrincipal()->OriginAttributesRef(), flags,
aReason);
}
nsresult nsHTMLDNSPrefetch::CancelPrefetch(
const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes, uint16_t flags,
nsresult aReason) {
// Forward this request to Necko Parent if we're a child process
if (IsNeckoChild()) {
// We need to check IsEmpty() because net_IsValidHostName()
// considers empty strings to be valid hostnames
if (!hostname.IsEmpty() &&
net_IsValidHostName(NS_ConvertUTF16toUTF8(hostname))) {
// during shutdown gNeckoChild might be null
if (gNeckoChild) {
gNeckoChild->SendCancelHTMLDNSPrefetch(
nsString(hostname), isHttps, aOriginAttributes, flags, aReason);
}
}
return NS_OK;
}
if (!(sInitialized && sDNSService && sPrefetches && sDNSListener))
return NS_ERROR_NOT_AVAILABLE;
// Forward cancellation to DNS service
nsresult rv = sDNSService->CancelAsyncResolveNative(
NS_ConvertUTF16toUTF8(hostname), flags | nsIDNSService::RESOLVE_SPECULATE,
sDNSListener, aReason, aOriginAttributes);
// Cancel fetching ESNI keys if needed.
if (sEsniEnabled && isHttps) {
nsAutoCString esniHost;
esniHost.Append("_esni.");
esniHost.Append(NS_ConvertUTF16toUTF8(hostname));
sDNSService->CancelAsyncResolveByTypeNative(
esniHost, nsIDNSService::RESOLVE_TYPE_TXT,
flags | nsIDNSService::RESOLVE_SPECULATE, sDNSListener, aReason,
aOriginAttributes);
}
return rv;
}
nsresult nsHTMLDNSPrefetch::CancelPrefetchLow(Link* aElement,
nsresult aReason) {
return CancelPrefetch(aElement, nsIDNSService::RESOLVE_PRIORITY_LOW, aReason);
}
nsresult nsHTMLDNSPrefetch::CancelPrefetchLow(
const nsAString& hostname, bool isHttps,
const OriginAttributes& aOriginAttributes, nsresult aReason) {
return CancelPrefetch(hostname, isHttps, aOriginAttributes,
nsIDNSService::RESOLVE_PRIORITY_LOW, aReason);
}
void nsHTMLDNSPrefetch::LinkDestroyed(Link* aLink) {
MOZ_ASSERT(aLink->IsInDNSPrefetch());
if (sPrefetches) {
// Clean up all the possible links at once.
sPrefetches->RemoveUnboundLinks();
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS(nsHTMLDNSPrefetch::nsListener, nsIDNSListener)
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsListener::OnLookupComplete(nsICancelable* request,
nsIDNSRecord* rec,
nsresult status) {
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsListener::OnLookupByTypeComplete(nsICancelable* request,
nsIDNSByTypeRecord* res,
nsresult status) {
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
nsHTMLDNSPrefetch::nsDeferrals::nsDeferrals()
: mHead(0), mTail(0), mActiveLoaderCount(0), mTimerArmed(false) {
mTimer = NS_NewTimer();
;
}
nsHTMLDNSPrefetch::nsDeferrals::~nsDeferrals() {
if (mTimerArmed) {
mTimerArmed = false;
mTimer->Cancel();
}
Flush();
}
NS_IMPL_ISUPPORTS(nsHTMLDNSPrefetch::nsDeferrals, nsIWebProgressListener,
nsISupportsWeakReference, nsIObserver)
void nsHTMLDNSPrefetch::nsDeferrals::Flush() {
while (mHead != mTail) {
if (mEntries[mTail].mElement) {
mEntries[mTail].mElement->ClearIsInDNSPrefetch();
}
mEntries[mTail].mElement = nullptr;
mTail = (mTail + 1) & sMaxDeferredMask;
}
}
nsresult nsHTMLDNSPrefetch::nsDeferrals::Add(uint16_t flags, Link* aElement) {
// The FIFO has no lock, so it can only be accessed on main thread
NS_ASSERTION(NS_IsMainThread(), "nsDeferrals::Add must be on main thread");
aElement->OnDNSPrefetchDeferred();
if (((mHead + 1) & sMaxDeferredMask) == mTail)
return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
aElement->SetIsInDNSPrefetch();
mEntries[mHead].mFlags = flags;
mEntries[mHead].mElement = aElement;
mHead = (mHead + 1) & sMaxDeferredMask;
if (!mActiveLoaderCount && !mTimerArmed && mTimer) {
mTimerArmed = true;
mTimer->InitWithNamedFuncCallback(Tick, this, 2000, nsITimer::TYPE_ONE_SHOT,
"nsHTMLDNSPrefetch::nsDeferrals::Tick");
}
return NS_OK;
}
void nsHTMLDNSPrefetch::nsDeferrals::SubmitQueue() {
NS_ASSERTION(NS_IsMainThread(),
"nsDeferrals::SubmitQueue must be on main thread");
nsCString hostName;
if (!sDNSService) return;
while (mHead != mTail) {
nsCOMPtr<Link> link = mEntries[mTail].mElement;
if (link) {
link->ClearIsInDNSPrefetch();
// Only prefetch here if request was deferred and deferral not cancelled
if (link && link->HasDeferredDNSPrefetchRequest()) {
nsCOMPtr<nsIURI> hrefURI(link ? link->GetURI() : nullptr);
bool isLocalResource = false;
nsresult rv = NS_OK;
Element* element = link->GetElement();
hostName.Truncate();
bool isHttps = false;
if (hrefURI) {
hrefURI->GetAsciiHost(hostName);
rv = NS_URIChainHasFlags(hrefURI,
nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
&isLocalResource);
isHttps = hrefURI->SchemeIs("https");
}
if (!hostName.IsEmpty() && NS_SUCCEEDED(rv) && !isLocalResource &&
element) {
if (IsNeckoChild()) {
// during shutdown gNeckoChild might be null
if (gNeckoChild) {
gNeckoChild->SendHTMLDNSPrefetch(
NS_ConvertUTF8toUTF16(hostName), isHttps,
element->NodePrincipal()->OriginAttributesRef(),
mEntries[mTail].mFlags);
}
} else {
nsCOMPtr<nsICancelable> tmpOutstanding;
rv = sDNSService->AsyncResolveNative(
hostName,
mEntries[mTail].mFlags | nsIDNSService::RESOLVE_SPECULATE,
sDNSListener, nullptr,
element->NodePrincipal()->OriginAttributesRef(),
getter_AddRefs(tmpOutstanding));
// Fetch ESNI keys if needed.
if (NS_SUCCEEDED(rv) && sEsniEnabled && isHttps) {
nsAutoCString esniHost;
esniHost.Append("_esni.");
esniHost.Append(hostName);
sDNSService->AsyncResolveByTypeNative(
esniHost, nsIDNSService::RESOLVE_TYPE_TXT,
mEntries[mTail].mFlags | nsIDNSService::RESOLVE_SPECULATE,
sDNSListener, nullptr,
element->NodePrincipal()->OriginAttributesRef(),
getter_AddRefs(tmpOutstanding));
}
// Tell link that deferred prefetch was requested
if (NS_SUCCEEDED(rv)) link->OnDNSPrefetchRequested();
}
}
}
}
mEntries[mTail].mElement = nullptr;
mTail = (mTail + 1) & sMaxDeferredMask;
}
if (mTimerArmed) {
mTimerArmed = false;
mTimer->Cancel();
}
}
void nsHTMLDNSPrefetch::nsDeferrals::Activate() {
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress = components::DocLoader::Service();
if (progress)
progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
// Register as an observer for xpcom shutdown events so we can drop any
// element refs
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService)
observerService->AddObserver(this, "xpcom-shutdown", true);
}
void nsHTMLDNSPrefetch::nsDeferrals::RemoveUnboundLinks() {
uint16_t tail = mTail;
while (mHead != tail) {
if (mEntries[tail].mElement &&
!mEntries[tail].mElement->GetElement()->IsInComposedDoc()) {
mEntries[tail].mElement->ClearIsInDNSPrefetch();
mEntries[tail].mElement = nullptr;
}
tail = (tail + 1) & sMaxDeferredMask;
}
}
// nsITimer related method
void nsHTMLDNSPrefetch::nsDeferrals::Tick(nsITimer* aTimer, void* aClosure) {
nsHTMLDNSPrefetch::nsDeferrals* self =
(nsHTMLDNSPrefetch::nsDeferrals*)aClosure;
NS_ASSERTION(NS_IsMainThread(), "nsDeferrals::Tick must be on main thread");
NS_ASSERTION(self->mTimerArmed, "Timer is not armed");
self->mTimerArmed = false;
// If the queue is not submitted here because there are outstanding pages
// being loaded, there is no need to rearm the timer as the queue will be
// submtited when those loads complete.
if (!self->mActiveLoaderCount) self->SubmitQueue();
}
//////////// nsIWebProgressListener methods
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnStateChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
uint32_t progressStateFlags,
nsresult aStatus) {
// The FIFO has no lock, so it can only be accessed on main thread
NS_ASSERTION(NS_IsMainThread(),
"nsDeferrals::OnStateChange must be on main thread");
if (progressStateFlags & STATE_IS_DOCUMENT) {
if (progressStateFlags & STATE_STOP) {
// Initialization may have missed a STATE_START notification, so do
// not go negative
if (mActiveLoaderCount) mActiveLoaderCount--;
if (!mActiveLoaderCount) SubmitQueue();
} else if (progressStateFlags & STATE_START)
mActiveLoaderCount++;
}
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnProgressChange(nsIWebProgress* aProgress,
nsIRequest* aRequest,
int32_t curSelfProgress,
int32_t maxSelfProgress,
int32_t curTotalProgress,
int32_t maxTotalProgress) {
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnLocationChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
nsIURI* location,
uint32_t aFlags) {
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnStatusChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
nsresult aStatus,
const char16_t* aMessage) {
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnSecurityChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
uint32_t aState) {
return NS_OK;
}
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::OnContentBlockingEvent(
nsIWebProgress* aWebProgress, nsIRequest* aRequest, uint32_t aEvent) {
return NS_OK;
}
//////////// nsIObserver method
NS_IMETHODIMP
nsHTMLDNSPrefetch::nsDeferrals::Observe(nsISupports* subject, const char* topic,
const char16_t* data) {
if (!strcmp(topic, "xpcom-shutdown")) Flush();
return NS_OK;
}
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