зеркало из https://github.com/mozilla/gecko-dev.git
130 строки
4.3 KiB
C++
130 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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 "nsDNSPrefetch.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsString.h"
|
|
#include "nsThreadUtils.h"
|
|
|
|
#include "nsIDNSListener.h"
|
|
#include "nsIDNSService.h"
|
|
#include "nsICancelable.h"
|
|
#include "nsIURI.h"
|
|
#include "mozilla/Atomics.h"
|
|
#include "mozilla/Preferences.h"
|
|
|
|
static nsIDNSService* sDNSService = nullptr;
|
|
static mozilla::Atomic<bool, mozilla::Relaxed> sESNIEnabled(false);
|
|
const char kESNIPref[] = "network.security.esni.enabled";
|
|
|
|
nsresult nsDNSPrefetch::Initialize(nsIDNSService* aDNSService) {
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
|
|
NS_IF_RELEASE(sDNSService);
|
|
sDNSService = aDNSService;
|
|
NS_IF_ADDREF(sDNSService);
|
|
mozilla::Preferences::RegisterCallback(nsDNSPrefetch::PrefChanged, kESNIPref);
|
|
PrefChanged(nullptr, nullptr);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsDNSPrefetch::Shutdown() {
|
|
NS_IF_RELEASE(sDNSService);
|
|
mozilla::Preferences::UnregisterCallback(nsDNSPrefetch::PrefChanged,
|
|
kESNIPref);
|
|
return NS_OK;
|
|
}
|
|
|
|
// static
|
|
void nsDNSPrefetch::PrefChanged(const char* aPref, void* aClosure) {
|
|
if (!aPref || strcmp(aPref, kESNIPref) == 0) {
|
|
bool enabled = false;
|
|
if (NS_SUCCEEDED(mozilla::Preferences::GetBool(kESNIPref, &enabled))) {
|
|
sESNIEnabled = enabled;
|
|
}
|
|
}
|
|
}
|
|
|
|
nsDNSPrefetch::nsDNSPrefetch(nsIURI* aURI,
|
|
mozilla::OriginAttributes& aOriginAttributes,
|
|
nsIRequest::TRRMode aTRRMode,
|
|
nsIDNSListener* aListener, bool storeTiming)
|
|
: mOriginAttributes(aOriginAttributes),
|
|
mStoreTiming(storeTiming),
|
|
mTRRMode(aTRRMode),
|
|
mListener(do_GetWeakReference(aListener)) {
|
|
aURI->GetAsciiHost(mHostname);
|
|
mIsHttps = aURI->SchemeIs("https");
|
|
}
|
|
|
|
nsresult nsDNSPrefetch::Prefetch(uint32_t flags) {
|
|
if (mHostname.IsEmpty()) return NS_ERROR_NOT_AVAILABLE;
|
|
|
|
if (!sDNSService) return NS_ERROR_NOT_AVAILABLE;
|
|
|
|
nsCOMPtr<nsICancelable> tmpOutstanding;
|
|
|
|
if (mStoreTiming) mStartTimestamp = mozilla::TimeStamp::Now();
|
|
// If AsyncResolve fails, for example because prefetching is disabled,
|
|
// then our timing will be useless. However, in such a case,
|
|
// mEndTimestamp will be a null timestamp and callers should check
|
|
// TimingsValid() before using the timing.
|
|
nsCOMPtr<nsIEventTarget> target = mozilla::GetCurrentThreadEventTarget();
|
|
|
|
flags |= nsIDNSService::GetFlagsFromTRRMode(mTRRMode);
|
|
|
|
nsresult rv = sDNSService->AsyncResolveNative(
|
|
mHostname, flags | nsIDNSService::RESOLVE_SPECULATE, this, target,
|
|
mOriginAttributes, getter_AddRefs(tmpOutstanding));
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
|
|
// Fetch esni keys if needed.
|
|
if (sESNIEnabled && mIsHttps) {
|
|
nsAutoCString esniHost;
|
|
esniHost.Append("_esni.");
|
|
esniHost.Append(mHostname);
|
|
sDNSService->AsyncResolveByTypeNative(
|
|
esniHost, nsIDNSService::RESOLVE_TYPE_TXT,
|
|
flags | nsIDNSService::RESOLVE_SPECULATE, this, target,
|
|
mOriginAttributes, getter_AddRefs(tmpOutstanding));
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsDNSPrefetch::PrefetchLow(bool refreshDNS) {
|
|
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_LOW |
|
|
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
|
|
}
|
|
|
|
nsresult nsDNSPrefetch::PrefetchMedium(bool refreshDNS) {
|
|
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_MEDIUM |
|
|
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
|
|
}
|
|
|
|
nsresult nsDNSPrefetch::PrefetchHigh(bool refreshDNS) {
|
|
return Prefetch(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0);
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(nsDNSPrefetch, nsIDNSListener)
|
|
|
|
NS_IMETHODIMP
|
|
nsDNSPrefetch::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
|
|
nsresult status) {
|
|
if (mStoreTiming) {
|
|
mEndTimestamp = mozilla::TimeStamp::Now();
|
|
}
|
|
nsCOMPtr<nsIDNSListener> listener = do_QueryReferent(mListener);
|
|
if (listener) {
|
|
listener->OnLookupComplete(request, rec, status);
|
|
}
|
|
// OnLookupComplete should be called on the target thread, so we release
|
|
// mListener here to make sure mListener is also released on the target
|
|
// thread.
|
|
mListener = nullptr;
|
|
return NS_OK;
|
|
}
|