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gecko-dev
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gecko-dev/netwerk/dns/ChildDNSService.cpp

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/* 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 "mozilla/net/ChildDNSService.h"
#include "nsIDNSListener.h"
#include "nsIIOService.h"
#include "nsIThread.h"
#include "nsThreadUtils.h"
#include "nsIXPConnect.h"
#include "nsIPrefService.h"
#include "nsIProtocolProxyService.h"
#include "nsNetCID.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/SystemGroup.h"
#include "mozilla/net/NeckoChild.h"
#include "mozilla/net/DNSListenerProxy.h"
#include "nsServiceManagerUtils.h"
namespace mozilla {
namespace net {
//-----------------------------------------------------------------------------
// ChildDNSService
//-----------------------------------------------------------------------------
static StaticRefPtr<ChildDNSService> gChildDNSService;
static const char kPrefNameDisablePrefetch[] = "network.dns.disablePrefetch";
already_AddRefed<ChildDNSService> ChildDNSService::GetSingleton() {
MOZ_ASSERT(IsNeckoChild());
if (!gChildDNSService) {
gChildDNSService = new ChildDNSService();
ClearOnShutdown(&gChildDNSService);
}
return do_AddRef(gChildDNSService);
}
NS_IMPL_ISUPPORTS(ChildDNSService, nsIDNSService, nsPIDNSService, nsIObserver)
ChildDNSService::ChildDNSService()
: mFirstTime(true),
mDisablePrefetch(false),
mPendingRequestsLock("DNSPendingRequestsLock") {
MOZ_ASSERT(IsNeckoChild());
}
void ChildDNSService::GetDNSRecordHashKey(
const nsACString &aHost, uint16_t aType,
const OriginAttributes &aOriginAttributes, uint32_t aFlags,
nsIDNSListener *aListener, nsACString &aHashKey) {
aHashKey.Assign(aHost);
aHashKey.AppendInt(aType);
nsAutoCString originSuffix;
aOriginAttributes.CreateSuffix(originSuffix);
aHashKey.Append(originSuffix);
aHashKey.AppendInt(aFlags);
aHashKey.AppendPrintf("%p", aListener);
}
nsresult ChildDNSService::AsyncResolveInternal(
const nsACString &hostname, uint16_t type, uint32_t flags,
nsIDNSListener *listener, nsIEventTarget *target_,
const OriginAttributes &aOriginAttributes, nsICancelable **result) {
NS_ENSURE_TRUE(gNeckoChild != nullptr, NS_ERROR_FAILURE);
if (mDisablePrefetch && (flags & RESOLVE_SPECULATE)) {
return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
}
// We need original flags for the pending requests hash.
uint32_t originalFlags = flags;
// Support apps being 'offline' even if parent is not: avoids DNS traffic by
// apps that have been told they are offline.
if (GetOffline()) {
flags |= RESOLVE_OFFLINE;
}
// We need original listener for the pending requests hash.
nsIDNSListener *originalListener = listener;
// make sure JS callers get notification on the main thread
nsCOMPtr<nsIEventTarget> target = target_;
nsCOMPtr<nsIXPConnectWrappedJS> wrappedListener = do_QueryInterface(listener);
if (wrappedListener && !target) {
target = SystemGroup::EventTargetFor(TaskCategory::Network);
}
if (target) {
// Guarantee listener freed on main thread. Not sure we need this in child
// (or in parent in nsDNSService.cpp) but doesn't hurt.
listener = new DNSListenerProxy(listener, target);
}
RefPtr<DNSRequestChild> childReq = new DNSRequestChild(
hostname, type, aOriginAttributes, flags, listener, target);
{
MutexAutoLock lock(mPendingRequestsLock);
nsCString key;
GetDNSRecordHashKey(hostname, type, aOriginAttributes, originalFlags,
originalListener, key);
auto entry = mPendingRequests.LookupForAdd(key);
if (entry) {
entry.Data()->AppendElement(childReq);
} else {
entry.OrInsert([&]() {
auto *hashEntry = new nsTArray<RefPtr<DNSRequestChild>>();
hashEntry->AppendElement(childReq);
return hashEntry;
});
}
}
childReq->StartRequest();
childReq.forget(result);
return NS_OK;
}
nsresult ChildDNSService::CancelAsyncResolveInternal(
const nsACString &aHostname, uint16_t aType, uint32_t aFlags,
nsIDNSListener *aListener, nsresult aReason,
const OriginAttributes &aOriginAttributes) {
if (mDisablePrefetch && (aFlags & RESOLVE_SPECULATE)) {
return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
}
MutexAutoLock lock(mPendingRequestsLock);
nsTArray<RefPtr<DNSRequestChild>> *hashEntry;
nsCString key;
GetDNSRecordHashKey(aHostname, aType, aOriginAttributes, aFlags, aListener,
key);
if (mPendingRequests.Get(key, &hashEntry)) {
// We cancel just one.
hashEntry->ElementAt(0)->Cancel(aReason);
}
return NS_OK;
}
//-----------------------------------------------------------------------------
// ChildDNSService::nsIDNSService
//-----------------------------------------------------------------------------
NS_IMETHODIMP
ChildDNSService::AsyncResolve(const nsACString &hostname, uint32_t flags,
nsIDNSListener *listener, nsIEventTarget *target_,
JS::HandleValue aOriginAttributes, JSContext *aCx,
uint8_t aArgc, nsICancelable **result) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return AsyncResolveInternal(hostname, nsIDNSService::RESOLVE_TYPE_DEFAULT,
flags, listener, target_, attrs, result);
}
NS_IMETHODIMP
ChildDNSService::AsyncResolveNative(const nsACString &hostname, uint32_t flags,
nsIDNSListener *listener,
nsIEventTarget *target_,
const OriginAttributes &aOriginAttributes,
nsICancelable **result) {
return AsyncResolveInternal(hostname, nsIDNSService::RESOLVE_TYPE_DEFAULT,
flags, listener, target_, aOriginAttributes,
result);
}
NS_IMETHODIMP
ChildDNSService::AsyncResolveByType(const nsACString &hostname, uint16_t type,
uint32_t flags, nsIDNSListener *listener,
nsIEventTarget *target_,
JS::HandleValue aOriginAttributes,
JSContext *aCx, uint8_t aArgc,
nsICancelable **result) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return AsyncResolveInternal(hostname, type, flags, listener, target_, attrs,
result);
}
NS_IMETHODIMP
ChildDNSService::AsyncResolveByTypeNative(
const nsACString &hostname, uint16_t type, uint32_t flags,
nsIDNSListener *listener, nsIEventTarget *target_,
const OriginAttributes &aOriginAttributes, nsICancelable **result) {
return AsyncResolveInternal(hostname, type, flags, listener, target_,
aOriginAttributes, result);
}
NS_IMETHODIMP
ChildDNSService::CancelAsyncResolve(const nsACString &aHostname,
uint32_t aFlags, nsIDNSListener *aListener,
nsresult aReason,
JS::HandleValue aOriginAttributes,
JSContext *aCx, uint8_t aArgc) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return CancelAsyncResolveInternal(aHostname,
nsIDNSService::RESOLVE_TYPE_DEFAULT, aFlags,
aListener, aReason, attrs);
}
NS_IMETHODIMP
ChildDNSService::CancelAsyncResolveNative(
const nsACString &aHostname, uint32_t aFlags, nsIDNSListener *aListener,
nsresult aReason, const OriginAttributes &aOriginAttributes) {
return CancelAsyncResolveInternal(aHostname,
nsIDNSService::RESOLVE_TYPE_DEFAULT, aFlags,
aListener, aReason, aOriginAttributes);
}
NS_IMETHODIMP
ChildDNSService::CancelAsyncResolveByType(const nsACString &aHostname,
uint16_t aType, uint32_t aFlags,
nsIDNSListener *aListener,
nsresult aReason,
JS::HandleValue aOriginAttributes,
JSContext *aCx, uint8_t aArgc) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return CancelAsyncResolveInternal(aHostname, aType, aFlags, aListener,
aReason, attrs);
}
NS_IMETHODIMP
ChildDNSService::CancelAsyncResolveByTypeNative(
const nsACString &aHostname, uint16_t aType, uint32_t aFlags,
nsIDNSListener *aListener, nsresult aReason,
const OriginAttributes &aOriginAttributes) {
return CancelAsyncResolveInternal(aHostname, aType, aFlags, aListener,
aReason, aOriginAttributes);
}
NS_IMETHODIMP
ChildDNSService::Resolve(const nsACString &hostname, uint32_t flags,
JS::HandleValue aOriginAttributes, JSContext *aCx,
uint8_t aArgc, nsIDNSRecord **result) {
// not planning to ever support this, since sync IPDL is evil.
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP
ChildDNSService::ResolveNative(const nsACString &hostname, uint32_t flags,
const OriginAttributes &aOriginAttributes,
nsIDNSRecord **result) {
// not planning to ever support this, since sync IPDL is evil.
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP
ChildDNSService::GetDNSCacheEntries(
nsTArray<mozilla::net::DNSCacheEntries> *args) {
// Only used by networking dashboard, so may not ever need this in child.
// (and would provide a way to spy on what hosts other apps are connecting to,
// unless we start keeping per-app DNS caches).
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP
ChildDNSService::ClearCache(bool aTrrToo) { return NS_ERROR_NOT_AVAILABLE; }
NS_IMETHODIMP
ChildDNSService::GetMyHostName(nsACString &result) {
// TODO: get value from parent during PNecko construction?
return NS_ERROR_NOT_AVAILABLE;
}
void ChildDNSService::NotifyRequestDone(DNSRequestChild *aDnsRequest) {
// We need the original flags and listener for the pending requests hash.
uint32_t originalFlags = aDnsRequest->mFlags & ~RESOLVE_OFFLINE;
nsCOMPtr<nsIDNSListener> originalListener = aDnsRequest->mListener;
nsCOMPtr<nsIDNSListenerProxy> wrapper = do_QueryInterface(originalListener);
if (wrapper) {
wrapper->GetOriginalListener(getter_AddRefs(originalListener));
if (NS_WARN_IF(!originalListener)) {
MOZ_ASSERT(originalListener);
return;
}
}
MutexAutoLock lock(mPendingRequestsLock);
nsCString key;
GetDNSRecordHashKey(aDnsRequest->mHost, aDnsRequest->mType,
aDnsRequest->mOriginAttributes, originalFlags,
originalListener, key);
nsTArray<RefPtr<DNSRequestChild>> *hashEntry;
if (mPendingRequests.Get(key, &hashEntry)) {
auto idx = hashEntry->IndexOf(aDnsRequest);
if (idx != nsTArray<RefPtr<DNSRequestChild>>::NoIndex) {
hashEntry->RemoveElementAt(idx);
if (hashEntry->IsEmpty()) {
mPendingRequests.Remove(key);
}
}
}
}
//-----------------------------------------------------------------------------
// ChildDNSService::nsPIDNSService
//-----------------------------------------------------------------------------
nsresult ChildDNSService::Init() {
// Disable prefetching either by explicit preference or if a manual proxy
// is configured
bool disablePrefetch = false;
int proxyType = nsIProtocolProxyService::PROXYCONFIG_DIRECT;
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
prefs->GetIntPref("network.proxy.type", &proxyType);
prefs->GetBoolPref(kPrefNameDisablePrefetch, &disablePrefetch);
}
if (mFirstTime) {
mFirstTime = false;
if (prefs) {
prefs->AddObserver(kPrefNameDisablePrefetch, this, false);
// Monitor these to see if there is a change in proxy configuration
// If a manual proxy is in use, disable prefetch implicitly
prefs->AddObserver("network.proxy.type", this, false);
}
}
mDisablePrefetch = disablePrefetch ||
(proxyType == nsIProtocolProxyService::PROXYCONFIG_MANUAL);
return NS_OK;
}
nsresult ChildDNSService::Shutdown() { return NS_OK; }
NS_IMETHODIMP
ChildDNSService::GetPrefetchEnabled(bool *outVal) {
*outVal = !mDisablePrefetch;
return NS_OK;
}
NS_IMETHODIMP
ChildDNSService::SetPrefetchEnabled(bool inVal) {
mDisablePrefetch = !inVal;
return NS_OK;
}
bool ChildDNSService::GetOffline() const {
bool offline = false;
nsCOMPtr<nsIIOService> io = do_GetService(NS_IOSERVICE_CONTRACTID);
if (io) {
io->GetOffline(&offline);
}
return offline;
}
//-----------------------------------------------------------------------------
// ChildDNSService::nsIObserver
//-----------------------------------------------------------------------------
NS_IMETHODIMP
ChildDNSService::Observe(nsISupports *subject, const char *topic,
const char16_t *data) {
// we are only getting called if a preference has changed.
NS_ASSERTION(strcmp(topic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) == 0,
"unexpected observe call");
// Reread prefs
Init();
return NS_OK;
}
} // namespace net
} // namespace mozilla
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