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2f3c76f02c
gecko-dev/netwerk/dns/nsDNSService2.cpp
Dragana Damjanovic 2f3c76f02c Bug 1612816 - Implement AsyncResoleWithTrrServer. r=valentin 
Differential Revision: https://phabricator.services.mozilla.com/D61445

--HG--
extra : moz-landing-system : lando
2020-02-04 19:35:34 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et 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 "nsDNSService2.h"
#include "nsIDNSRecord.h"
#include "nsIDNSListener.h"
#include "nsIDNSByTypeRecord.h"
#include "nsICancelable.h"
#include "nsIPrefBranch.h"
#include "nsIXPConnect.h"
#include "nsProxyRelease.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsAutoPtr.h"
#include "nsNetCID.h"
#include "nsError.h"
#include "nsDNSPrefetch.h"
#include "nsThreadUtils.h"
#include "nsIProtocolProxyService.h"
#include "prsystem.h"
#include "prnetdb.h"
#include "prmon.h"
#include "prio.h"
#include "plstr.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsNetAddr.h"
#include "nsProxyRelease.h"
#include "nsQueryObject.h"
#include "nsIObserverService.h"
#include "nsINetworkLinkService.h"
#include "TRRService.h"
#include "mozilla/Attributes.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/net/NeckoCommon.h"
#include "mozilla/net/ChildDNSService.h"
#include "mozilla/net/DNSListenerProxy.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/TextUtils.h"
#include "mozilla/Utf8.h"
using namespace mozilla;
using namespace mozilla::net;
static const char kPrefDnsCacheEntries[] = "network.dnsCacheEntries";
static const char kPrefDnsCacheExpiration[] = "network.dnsCacheExpiration";
static const char kPrefDnsCacheGrace[] =
"network.dnsCacheExpirationGracePeriod";
static const char kPrefIPv4OnlyDomains[] = "network.dns.ipv4OnlyDomains";
static const char kPrefDisableIPv6[] = "network.dns.disableIPv6";
static const char kPrefDisablePrefetch[] = "network.dns.disablePrefetch";
static const char kPrefBlockDotOnion[] = "network.dns.blockDotOnion";
static const char kPrefDnsLocalDomains[] = "network.dns.localDomains";
static const char kPrefDnsForceResolve[] = "network.dns.forceResolve";
static const char kPrefDnsOfflineLocalhost[] = "network.dns.offline-localhost";
static const char kPrefDnsNotifyResolution[] = "network.dns.notifyResolution";
static const char kPrefNetworkProxyType[] = "network.proxy.type";
//-----------------------------------------------------------------------------
class nsDNSRecord : public nsIDNSRecord {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIDNSRECORD
explicit nsDNSRecord(nsHostRecord* hostRecord)
: mIter(nullptr), mIterGenCnt(-1), mDone(false) {
mHostRecord = do_QueryObject(hostRecord);
}
private:
virtual ~nsDNSRecord() = default;
RefPtr<AddrHostRecord> mHostRecord;
NetAddrElement* mIter;
int mIterGenCnt; // the generation count of
// mHostRecord->addr_info when we
// start iterating
bool mDone;
};
NS_IMPL_ISUPPORTS(nsDNSRecord, nsIDNSRecord)
NS_IMETHODIMP
nsDNSRecord::GetCanonicalName(nsACString& result) {
// this method should only be called if we have a CNAME
NS_ENSURE_TRUE(mHostRecord->flags & nsHostResolver::RES_CANON_NAME,
NS_ERROR_NOT_AVAILABLE);
MutexAutoLock lock(mHostRecord->addr_info_lock);
// if the record is for an IP address literal, then the canonical
// host name is the IP address literal.
if (!mHostRecord->addr_info) {
result = mHostRecord->host;
return NS_OK;
}
if (mHostRecord->addr_info->mCanonicalName.IsEmpty()) {
result = mHostRecord->addr_info->mHostName;
} else {
result = mHostRecord->addr_info->mCanonicalName;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::IsTRR(bool* retval) {
MutexAutoLock lock(mHostRecord->addr_info_lock);
if (mHostRecord->addr_info) {
*retval = mHostRecord->addr_info->IsTRR();
} else {
*retval = false;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetTrrFetchDuration(double* aTime) {
MutexAutoLock lock(mHostRecord->addr_info_lock);
if (mHostRecord->addr_info && mHostRecord->addr_info->IsTRR()) {
*aTime = mHostRecord->addr_info->GetTrrFetchDuration();
} else {
*aTime = 0;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetTrrFetchDurationNetworkOnly(double* aTime) {
MutexAutoLock lock(mHostRecord->addr_info_lock);
if (mHostRecord->addr_info && mHostRecord->addr_info->IsTRR()) {
*aTime = mHostRecord->addr_info->GetTrrFetchDurationNetworkOnly();
} else {
*aTime = 0;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetNextAddr(uint16_t port, NetAddr* addr) {
if (mDone) {
return NS_ERROR_NOT_AVAILABLE;
}
mHostRecord->addr_info_lock.Lock();
if (mHostRecord->addr_info) {
if (mIterGenCnt != mHostRecord->addr_info_gencnt) {
// mHostRecord->addr_info has changed, restart the iteration.
mIter = nullptr;
mIterGenCnt = mHostRecord->addr_info_gencnt;
}
bool startedFresh = !mIter;
do {
if (!mIter) {
mIter = mHostRecord->addr_info->mAddresses.getFirst();
} else {
mIter = mIter->getNext();
}
} while (mIter && mHostRecord->Blacklisted(&mIter->mAddress));
if (!mIter && startedFresh) {
// If everything was blacklisted we want to reset the blacklist (and
// likely relearn it) and return the first address. That is better
// than nothing.
mHostRecord->ResetBlacklist();
mIter = mHostRecord->addr_info->mAddresses.getFirst();
}
if (mIter) {
memcpy(addr, &mIter->mAddress, sizeof(NetAddr));
}
mHostRecord->addr_info_lock.Unlock();
if (!mIter) {
mDone = true;
return NS_ERROR_NOT_AVAILABLE;
}
} else {
mHostRecord->addr_info_lock.Unlock();
if (!mHostRecord->addr) {
// Both mHostRecord->addr_info and mHostRecord->addr are null.
// This can happen if mHostRecord->addr_info expired and the
// attempt to reresolve it failed.
return NS_ERROR_NOT_AVAILABLE;
}
memcpy(addr, mHostRecord->addr.get(), sizeof(NetAddr));
mDone = true;
}
// set given port
port = htons(port);
if (addr->raw.family == AF_INET) {
addr->inet.port = port;
} else if (addr->raw.family == AF_INET6) {
addr->inet6.port = port;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetAddresses(nsTArray<NetAddr>& aAddressArray) {
if (mDone) {
return NS_ERROR_NOT_AVAILABLE;
}
mHostRecord->addr_info_lock.Lock();
if (mHostRecord->addr_info) {
for (NetAddrElement* iter = mHostRecord->addr_info->mAddresses.getFirst();
iter; iter = iter->getNext()) {
if (mHostRecord->Blacklisted(&iter->mAddress)) {
continue;
}
NetAddr* addr = aAddressArray.AppendElement(NetAddr());
memcpy(addr, &iter->mAddress, sizeof(NetAddr));
if (addr->raw.family == AF_INET) {
addr->inet.port = 0;
} else if (addr->raw.family == AF_INET6) {
addr->inet6.port = 0;
}
}
mHostRecord->addr_info_lock.Unlock();
} else {
mHostRecord->addr_info_lock.Unlock();
if (!mHostRecord->addr) {
return NS_ERROR_NOT_AVAILABLE;
}
NetAddr* addr = aAddressArray.AppendElement(NetAddr());
memcpy(addr, mHostRecord->addr.get(), sizeof(NetAddr));
if (addr->raw.family == AF_INET) {
addr->inet.port = 0;
} else if (addr->raw.family == AF_INET6) {
addr->inet6.port = 0;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetScriptableNextAddr(uint16_t port, nsINetAddr** result) {
NetAddr addr;
nsresult rv = GetNextAddr(port, &addr);
if (NS_FAILED(rv)) return rv;
NS_ADDREF(*result = new nsNetAddr(&addr));
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::GetNextAddrAsString(nsACString& result) {
NetAddr addr;
nsresult rv = GetNextAddr(0, &addr);
if (NS_FAILED(rv)) return rv;
char buf[kIPv6CStrBufSize];
if (NetAddrToString(&addr, buf, sizeof(buf))) {
result.Assign(buf);
return NS_OK;
}
NS_ERROR("NetAddrToString failed unexpectedly");
return NS_ERROR_FAILURE; // conversion failed for some reason
}
NS_IMETHODIMP
nsDNSRecord::HasMore(bool* result) {
if (mDone) {
*result = false;
return NS_OK;
}
NetAddrElement* iterCopy = mIter;
int iterGenCntCopy = mIterGenCnt;
NetAddr addr;
*result = NS_SUCCEEDED(GetNextAddr(0, &addr));
mIter = iterCopy;
mIterGenCnt = iterGenCntCopy;
mDone = false;
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::Rewind() {
mIter = nullptr;
mIterGenCnt = -1;
mDone = false;
return NS_OK;
}
NS_IMETHODIMP
nsDNSRecord::ReportUnusable(uint16_t aPort) {
// right now we don't use the port in the blacklist
MutexAutoLock lock(mHostRecord->addr_info_lock);
// Check that we are using a real addr_info (as opposed to a single
// constant address), and that the generation count is valid. Otherwise,
// ignore the report.
if (mHostRecord->addr_info && mIterGenCnt == mHostRecord->addr_info_gencnt &&
mIter) {
mHostRecord->ReportUnusable(&mIter->mAddress);
}
return NS_OK;
}
class nsDNSByTypeRecord : public nsIDNSByTypeRecord {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIDNSBYTYPERECORD
explicit nsDNSByTypeRecord(nsHostRecord* hostRecord) {
mHostRecord = do_QueryObject(hostRecord);
}
private:
virtual ~nsDNSByTypeRecord() = default;
RefPtr<TypeHostRecord> mHostRecord;
};
NS_IMPL_ISUPPORTS(nsDNSByTypeRecord, nsIDNSByTypeRecord)
NS_IMETHODIMP
nsDNSByTypeRecord::GetRecords(nsTArray<nsCString>& aRecords) {
// deep copy
mHostRecord->GetRecords(aRecords);
return NS_OK;
}
NS_IMETHODIMP
nsDNSByTypeRecord::GetRecordsAsOneString(nsACString& aRecords) {
// deep copy
mHostRecord->GetRecordsAsOneString(aRecords);
return NS_OK;
}
//-----------------------------------------------------------------------------
class nsDNSAsyncRequest final : public nsResolveHostCallback,
public nsICancelable {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSICANCELABLE
nsDNSAsyncRequest(nsHostResolver* res, const nsACString& host,
const nsACString& trrServer, uint16_t type,
const OriginAttributes& attrs, nsIDNSListener* listener,
uint16_t flags, uint16_t af)
: mResolver(res),
mHost(host),
mTrrServer(trrServer),
mType(type),
mOriginAttributes(attrs),
mListener(listener),
mFlags(flags),
mAF(af) {}
void OnResolveHostComplete(nsHostResolver*, nsHostRecord*, nsresult) override;
// Returns TRUE if the DNS listener arg is the same as the member listener
// Used in Cancellations to remove DNS requests associated with a
// particular hostname and nsIDNSListener
bool EqualsAsyncListener(nsIDNSListener* aListener) override;
size_t SizeOfIncludingThis(mozilla::MallocSizeOf) const override;
RefPtr<nsHostResolver> mResolver;
nsCString mHost; // hostname we're resolving
nsCString mTrrServer; // A trr server to be used.
uint16_t mType;
const OriginAttributes
mOriginAttributes; // The originAttributes for this resolving
nsCOMPtr<nsIDNSListener> mListener;
uint16_t mFlags;
uint16_t mAF;
private:
virtual ~nsDNSAsyncRequest() = default;
};
NS_IMPL_ISUPPORTS(nsDNSAsyncRequest, nsICancelable)
void nsDNSAsyncRequest::OnResolveHostComplete(nsHostResolver* resolver,
nsHostRecord* hostRecord,
nsresult status) {
if (hostRecord->type != nsDNSService::RESOLVE_TYPE_DEFAULT) {
nsCOMPtr<nsIDNSByTypeRecord> rec;
if (NS_SUCCEEDED(status)) {
MOZ_ASSERT(hostRecord, "no host record");
rec = new nsDNSByTypeRecord(hostRecord);
}
mListener->OnLookupByTypeComplete(this, rec, status);
} else {
// need to have an owning ref when we issue the callback to enable
// the caller to be able to addref/release multiple times without
// destroying the record prematurely.
nsCOMPtr<nsIDNSRecord> rec;
if (NS_SUCCEEDED(status)) {
NS_ASSERTION(hostRecord, "no host record");
rec = new nsDNSRecord(hostRecord);
}
mListener->OnLookupComplete(this, rec, status);
}
mListener = nullptr;
}
bool nsDNSAsyncRequest::EqualsAsyncListener(nsIDNSListener* aListener) {
nsCOMPtr<nsIDNSListenerProxy> wrapper = do_QueryInterface(mListener);
if (wrapper) {
nsCOMPtr<nsIDNSListener> originalListener;
wrapper->GetOriginalListener(getter_AddRefs(originalListener));
return aListener == originalListener;
}
return (aListener == mListener);
}
size_t nsDNSAsyncRequest::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const {
size_t n = mallocSizeOf(this);
// The following fields aren't measured.
// - mHost, because it's a non-owning pointer
// - mResolver, because it's a non-owning pointer
// - mListener, because it's a non-owning pointer
return n;
}
NS_IMETHODIMP
nsDNSAsyncRequest::Cancel(nsresult reason) {
NS_ENSURE_ARG(NS_FAILED(reason));
mResolver->DetachCallback(mHost, mTrrServer, mType, mOriginAttributes, mFlags,
mAF, this, reason);
return NS_OK;
}
//-----------------------------------------------------------------------------
class nsDNSSyncRequest : public nsResolveHostCallback {
NS_DECL_THREADSAFE_ISUPPORTS
public:
explicit nsDNSSyncRequest(PRMonitor* mon)
: mDone(false), mStatus(NS_OK), mMonitor(mon) {}
void OnResolveHostComplete(nsHostResolver*, nsHostRecord*, nsresult) override;
bool EqualsAsyncListener(nsIDNSListener* aListener) override;
size_t SizeOfIncludingThis(mozilla::MallocSizeOf) const override;
bool mDone;
nsresult mStatus;
RefPtr<nsHostRecord> mHostRecord;
private:
virtual ~nsDNSSyncRequest() = default;
PRMonitor* mMonitor;
};
NS_IMPL_ISUPPORTS0(nsDNSSyncRequest)
void nsDNSSyncRequest::OnResolveHostComplete(nsHostResolver* resolver,
nsHostRecord* hostRecord,
nsresult status) {
// store results, and wake up nsDNSService::Resolve to process results.
PR_EnterMonitor(mMonitor);
mDone = true;
mStatus = status;
mHostRecord = hostRecord;
PR_Notify(mMonitor);
PR_ExitMonitor(mMonitor);
}
bool nsDNSSyncRequest::EqualsAsyncListener(nsIDNSListener* aListener) {
// Sync request: no listener to compare
return false;
}
size_t nsDNSSyncRequest::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const {
size_t n = mallocSizeOf(this);
// The following fields aren't measured.
// - mHostRecord, because it's a non-owning pointer
// Measurement of the following members may be added later if DMD finds it
// is worthwhile:
// - mMonitor
return n;
}
class NotifyDNSResolution : public Runnable {
public:
explicit NotifyDNSResolution(const nsACString& aHostname)
: mozilla::Runnable("NotifyDNSResolution"), mHostname(aHostname) {}
NS_IMETHOD Run() override {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "dns-resolution-request",
NS_ConvertUTF8toUTF16(mHostname).get());
}
return NS_OK;
}
private:
nsCString mHostname;
};
//-----------------------------------------------------------------------------
nsDNSService::nsDNSService()
: mLock("nsDNSServer.mLock"),
mDisableIPv6(false),
mDisablePrefetch(false),
mBlockDotOnion(false),
mNotifyResolution(false),
mOfflineLocalhost(false),
mForceResolveOn(false),
mProxyType(0),
mTrrService(nullptr),
mResCacheEntries(0),
mResCacheExpiration(0),
mResCacheGrace(0),
mResolverPrefsUpdated(false) {}
nsDNSService::~nsDNSService() = default;
NS_IMPL_ISUPPORTS(nsDNSService, nsIDNSService, nsPIDNSService, nsIObserver,
nsIMemoryReporter)
/******************************************************************************
* nsDNSService impl:
* singleton instance ctor/dtor methods
******************************************************************************/
static StaticRefPtr<nsDNSService> gDNSService;
already_AddRefed<nsIDNSService> nsDNSService::GetXPCOMSingleton() {
if (XRE_IsParentProcess()) {
return GetSingleton();
}
if (XRE_IsContentProcess() || XRE_IsSocketProcess()) {
return ChildDNSService::GetSingleton();
}
return nullptr;
}
already_AddRefed<nsDNSService> nsDNSService::GetSingleton() {
NS_ASSERTION(XRE_IsParentProcess(), "not a parent process");
if (!gDNSService) {
gDNSService = new nsDNSService();
if (NS_SUCCEEDED(gDNSService->Init())) {
ClearOnShutdown(&gDNSService);
} else {
gDNSService = nullptr;
}
}
return do_AddRef(gDNSService);
}
nsresult nsDNSService::ReadPrefs(const char* name) {
bool tmpbool;
uint32_t tmpint;
mResolverPrefsUpdated = false;
// resolver-specific prefs first
if (!name || !strcmp(name, kPrefDnsCacheEntries)) {
if (NS_SUCCEEDED(Preferences::GetUint(kPrefDnsCacheEntries, &tmpint))) {
if (!name || (tmpint != mResCacheEntries)) {
mResCacheEntries = tmpint;
mResolverPrefsUpdated = true;
}
}
}
if (!name || !strcmp(name, kPrefDnsCacheExpiration)) {
if (NS_SUCCEEDED(Preferences::GetUint(kPrefDnsCacheExpiration, &tmpint))) {
if (!name || (tmpint != mResCacheExpiration)) {
mResCacheExpiration = tmpint;
mResolverPrefsUpdated = true;
}
}
}
if (!name || !strcmp(name, kPrefDnsCacheGrace)) {
if (NS_SUCCEEDED(Preferences::GetUint(kPrefDnsCacheGrace, &tmpint))) {
if (!name || (tmpint != mResCacheGrace)) {
mResCacheGrace = tmpint;
mResolverPrefsUpdated = true;
}
}
}
// DNSservice prefs
if (!name || !strcmp(name, kPrefDisableIPv6)) {
if (NS_SUCCEEDED(Preferences::GetBool(kPrefDisableIPv6, &tmpbool))) {
mDisableIPv6 = tmpbool;
}
}
if (!name || !strcmp(name, kPrefDnsOfflineLocalhost)) {
if (NS_SUCCEEDED(
Preferences::GetBool(kPrefDnsOfflineLocalhost, &tmpbool))) {
mOfflineLocalhost = tmpbool;
}
}
if (!name || !strcmp(name, kPrefDisablePrefetch)) {
if (NS_SUCCEEDED(Preferences::GetBool(kPrefDisablePrefetch, &tmpbool))) {
mDisablePrefetch = tmpbool;
}
}
if (!name || !strcmp(name, kPrefBlockDotOnion)) {
if (NS_SUCCEEDED(Preferences::GetBool(kPrefBlockDotOnion, &tmpbool))) {
mBlockDotOnion = tmpbool;
}
}
if (!name || !strcmp(name, kPrefDnsNotifyResolution)) {
if (NS_SUCCEEDED(
Preferences::GetBool(kPrefDnsNotifyResolution, &tmpbool))) {
mNotifyResolution = tmpbool;
}
}
if (!name || !strcmp(name, kPrefNetworkProxyType)) {
if (NS_SUCCEEDED(Preferences::GetUint(kPrefNetworkProxyType, &tmpint))) {
mProxyType = tmpint;
}
}
if (!name || !strcmp(name, kPrefIPv4OnlyDomains)) {
Preferences::GetCString(kPrefIPv4OnlyDomains, mIPv4OnlyDomains);
}
if (!name || !strcmp(name, kPrefDnsLocalDomains)) {
nsCString localDomains;
Preferences::GetCString(kPrefDnsLocalDomains, localDomains);
MutexAutoLock lock(mLock);
mLocalDomains.Clear();
if (!localDomains.IsEmpty()) {
nsCCharSeparatedTokenizer tokenizer(
localDomains, ',', nsCCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
while (tokenizer.hasMoreTokens()) {
mLocalDomains.PutEntry(tokenizer.nextToken());
}
}
}
if (!name || !strcmp(name, kPrefDnsForceResolve)) {
Preferences::GetCString(kPrefDnsForceResolve, mForceResolve);
mForceResolveOn = !mForceResolve.IsEmpty();
}
if (mProxyType == nsIProtocolProxyService::PROXYCONFIG_MANUAL) {
// Disable prefetching either by explicit preference or if a
// manual proxy is configured
mDisablePrefetch = true;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::Init() {
MOZ_ASSERT(!mResolver);
MOZ_ASSERT(NS_IsMainThread());
ReadPrefs(nullptr);
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->AddObserver(this, "last-pb-context-exited", false);
observerService->AddObserver(this, NS_NETWORK_LINK_TOPIC, false);
observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
}
RefPtr<nsHostResolver> res;
nsresult rv = nsHostResolver::Create(mResCacheEntries, mResCacheExpiration,
mResCacheGrace, getter_AddRefs(res));
if (NS_SUCCEEDED(rv)) {
// now, set all of our member variables while holding the lock
MutexAutoLock lock(mLock);
mResolver = res;
}
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
// register as prefs observer
prefs->AddObserver(kPrefDnsCacheEntries, this, false);
prefs->AddObserver(kPrefDnsCacheExpiration, this, false);
prefs->AddObserver(kPrefDnsCacheGrace, this, false);
prefs->AddObserver(kPrefIPv4OnlyDomains, this, false);
prefs->AddObserver(kPrefDnsLocalDomains, this, false);
prefs->AddObserver(kPrefDnsForceResolve, this, false);
prefs->AddObserver(kPrefDisableIPv6, this, false);
prefs->AddObserver(kPrefDnsOfflineLocalhost, this, false);
prefs->AddObserver(kPrefDisablePrefetch, this, false);
prefs->AddObserver(kPrefBlockDotOnion, this, false);
prefs->AddObserver(kPrefDnsNotifyResolution, 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);
}
nsDNSPrefetch::Initialize(this);
RegisterWeakMemoryReporter(this);
mTrrService = new TRRService();
if (NS_FAILED(mTrrService->Init())) {
mTrrService = nullptr;
}
nsCOMPtr<nsIIDNService> idn = do_GetService(NS_IDNSERVICE_CONTRACTID);
mIDN = idn;
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::Shutdown() {
UnregisterWeakMemoryReporter(this);
RefPtr<nsHostResolver> res;
{
MutexAutoLock lock(mLock);
res = mResolver;
mResolver = nullptr;
}
if (res) {
res->Shutdown();
}
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, NS_NETWORK_LINK_TOPIC);
observerService->RemoveObserver(this, "last-pb-context-exited");
observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
return NS_OK;
}
bool nsDNSService::GetOffline() const {
bool offline = false;
nsCOMPtr<nsIIOService> io = do_GetService(NS_IOSERVICE_CONTRACTID);
if (io) {
io->GetOffline(&offline);
}
return offline;
}
NS_IMETHODIMP
nsDNSService::GetPrefetchEnabled(bool* outVal) {
MutexAutoLock lock(mLock);
*outVal = !mDisablePrefetch;
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::SetPrefetchEnabled(bool inVal) {
MutexAutoLock lock(mLock);
mDisablePrefetch = !inVal;
return NS_OK;
}
nsresult nsDNSService::PreprocessHostname(bool aLocalDomain,
const nsACString& aInput,
nsIIDNService* aIDN,
nsACString& aACE) {
// Enforce RFC 7686
if (mBlockDotOnion && StringEndsWith(aInput, NS_LITERAL_CSTRING(".onion"))) {
return NS_ERROR_UNKNOWN_HOST;
}
if (aLocalDomain) {
aACE.AssignLiteral("localhost");
return NS_OK;
}
if (mTrrService && mTrrService->MaybeBootstrap(aInput, aACE)) {
return NS_OK;
}
if (mForceResolveOn) {
MutexAutoLock lock(mLock);
if (!aInput.LowerCaseEqualsASCII("localhost") &&
!aInput.LowerCaseEqualsASCII("127.0.0.1")) {
aACE.Assign(mForceResolve);
return NS_OK;
}
}
if (!aIDN || IsAscii(aInput)) {
aACE = aInput;
return NS_OK;
}
if (!(IsUtf8(aInput) && NS_SUCCEEDED(aIDN->ConvertUTF8toACE(aInput, aACE)))) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsDNSService::AsyncResolveInternal(
const nsACString& aHostname, const nsACString& aTrrServer, uint16_t type,
uint32_t flags, nsIDNSListener* aListener, nsIEventTarget* target_,
const OriginAttributes& aOriginAttributes, nsICancelable** result) {
// grab reference to global host resolver and IDN service. beware
// simultaneous shutdown!!
RefPtr<nsHostResolver> res;
nsCOMPtr<nsIIDNService> idn;
nsCOMPtr<nsIEventTarget> target = target_;
nsCOMPtr<nsIDNSListener> listener = aListener;
bool localDomain = false;
{
MutexAutoLock lock(mLock);
if (mDisablePrefetch && (flags & RESOLVE_SPECULATE))
return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
res = mResolver;
idn = mIDN;
localDomain = mLocalDomains.GetEntry(aHostname);
}
if (mNotifyResolution) {
NS_DispatchToMainThread(new NotifyDNSResolution(aHostname));
}
if (!res) return NS_ERROR_OFFLINE;
if ((type != RESOLVE_TYPE_DEFAULT) && (type != RESOLVE_TYPE_TXT)) {
return NS_ERROR_INVALID_ARG;
}
nsCString hostname;
nsresult rv = PreprocessHostname(localDomain, aHostname, idn, hostname);
if (NS_FAILED(rv)) {
return rv;
}
if (GetOffline() &&
(!mOfflineLocalhost || !hostname.LowerCaseEqualsASCII("localhost"))) {
flags |= RESOLVE_OFFLINE;
}
// make sure JS callers get notification on the main thread
nsCOMPtr<nsIXPConnectWrappedJS> wrappedListener = do_QueryInterface(listener);
if (wrappedListener && !target) {
target = GetMainThreadEventTarget();
}
if (target) {
listener = new DNSListenerProxy(listener, target);
}
uint16_t af =
(type != RESOLVE_TYPE_DEFAULT) ? 0 : GetAFForLookup(hostname, flags);
MOZ_ASSERT(listener);
RefPtr<nsDNSAsyncRequest> req = new nsDNSAsyncRequest(
res, hostname, aTrrServer, type, aOriginAttributes, listener, flags, af);
if (!req) return NS_ERROR_OUT_OF_MEMORY;
rv = res->ResolveHost(req->mHost, req->mTrrServer, type, req->mOriginAttributes,
flags, af, req);
req.forget(result);
return rv;
}
nsresult nsDNSService::CancelAsyncResolveInternal(
const nsACString& aHostname, const nsACString& aTrrServer, uint16_t aType,
uint32_t aFlags, nsIDNSListener* aListener, nsresult aReason,
const OriginAttributes& aOriginAttributes) {
// grab reference to global host resolver and IDN service. beware
// simultaneous shutdown!!
RefPtr<nsHostResolver> res;
nsCOMPtr<nsIIDNService> idn;
bool localDomain = false;
{
MutexAutoLock lock(mLock);
if (mDisablePrefetch && (aFlags & RESOLVE_SPECULATE))
return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
res = mResolver;
idn = mIDN;
localDomain = mLocalDomains.GetEntry(aHostname);
}
if (!res) return NS_ERROR_OFFLINE;
nsCString hostname;
nsresult rv = PreprocessHostname(localDomain, aHostname, idn, hostname);
if (NS_FAILED(rv)) {
return rv;
}
uint16_t af =
(aType != RESOLVE_TYPE_DEFAULT) ? 0 : GetAFForLookup(hostname, aFlags);
res->CancelAsyncRequest(hostname, aTrrServer, aType, aOriginAttributes, aFlags,
af, aListener, aReason);
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::AsyncResolve(const nsACString& aHostname, 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(aHostname, EmptyCString(), RESOLVE_TYPE_DEFAULT, flags,
listener, target_, attrs, result);
}
NS_IMETHODIMP
nsDNSService::AsyncResolveNative(const nsACString& aHostname, uint32_t flags,
nsIDNSListener* aListener,
nsIEventTarget* target_,
const OriginAttributes& aOriginAttributes,
nsICancelable** result) {
return AsyncResolveInternal(aHostname, EmptyCString(), RESOLVE_TYPE_DEFAULT, flags,
aListener, target_, aOriginAttributes, result);
}
NS_IMETHODIMP
nsDNSService::AsyncResolveWithTrrServer(const nsACString& aHostname,
const nsACString& aTrrServer, 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(aHostname, aTrrServer, RESOLVE_TYPE_DEFAULT, flags,
listener, target_, attrs, result);
}
NS_IMETHODIMP
nsDNSService::AsyncResolveWithTrrServerNative(
const nsACString& aHostname, const nsACString& aTrrServer, uint32_t flags,
nsIDNSListener* aListener, nsIEventTarget* target_,
const OriginAttributes& aOriginAttributes, nsICancelable** result) {
return AsyncResolveInternal(aHostname, aTrrServer, RESOLVE_TYPE_DEFAULT, flags,
aListener, target_, aOriginAttributes, result);
}
NS_IMETHODIMP
nsDNSService::AsyncResolveByType(const nsACString& aHostname, uint16_t aType,
uint32_t aFlags, nsIDNSListener* aListener,
nsIEventTarget* aTarget_,
JS::HandleValue aOriginAttributes,
JSContext* aCx, uint8_t aArgc,
nsICancelable** aResult) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return AsyncResolveInternal(aHostname, EmptyCString(), aType, aFlags, aListener,
aTarget_, attrs, aResult);
}
NS_IMETHODIMP
nsDNSService::AsyncResolveByTypeNative(
const nsACString& aHostname, uint16_t aType, uint32_t aFlags,
nsIDNSListener* aListener, nsIEventTarget* aTarget_,
const OriginAttributes& aOriginAttributes, nsICancelable** aResult) {
return AsyncResolveInternal(aHostname, EmptyCString(), aType, aFlags, aListener,
aTarget_, aOriginAttributes, aResult);
}
NS_IMETHODIMP
nsDNSService::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, EmptyCString(), RESOLVE_TYPE_DEFAULT,
aFlags, aListener, aReason, attrs);
}
NS_IMETHODIMP
nsDNSService::CancelAsyncResolveNative(
const nsACString& aHostname, uint32_t aFlags, nsIDNSListener* aListener,
nsresult aReason, const OriginAttributes& aOriginAttributes) {
return CancelAsyncResolveInternal(aHostname, EmptyCString(), RESOLVE_TYPE_DEFAULT,
aFlags, aListener, aReason, aOriginAttributes);
}
NS_IMETHODIMP
nsDNSService::CancelAsyncResolveWithTrrServer(const nsACString& aHostname,
const nsACString& aTrrServer, 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, aTrrServer, RESOLVE_TYPE_DEFAULT,
aFlags, aListener, aReason, attrs);
}
NS_IMETHODIMP
nsDNSService::CancelAsyncResolveWithTrrServerNative(
const nsACString& aHostname, const nsACString& aTrrServer, uint32_t aFlags,
nsIDNSListener* aListener, nsresult aReason,
const OriginAttributes& aOriginAttributes) {
return CancelAsyncResolveInternal(aHostname, aTrrServer, RESOLVE_TYPE_DEFAULT,
aFlags, aListener, aReason, aOriginAttributes);
}
NS_IMETHODIMP
nsDNSService::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, EmptyCString(), aType, aFlags, aListener,
aReason, attrs);
}
NS_IMETHODIMP
nsDNSService::CancelAsyncResolveByTypeNative(
const nsACString& aHostname, uint16_t aType, uint32_t aFlags,
nsIDNSListener* aListener, nsresult aReason,
const OriginAttributes& aOriginAttributes) {
return CancelAsyncResolveInternal(aHostname, EmptyCString(), aType, aFlags, aListener,
aReason, aOriginAttributes);
}
NS_IMETHODIMP
nsDNSService::Resolve(const nsACString& aHostname, uint32_t flags,
JS::HandleValue aOriginAttributes, JSContext* aCx,
uint8_t aArgc, nsIDNSRecord** result) {
OriginAttributes attrs;
if (aArgc == 1) {
if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) {
return NS_ERROR_INVALID_ARG;
}
}
return ResolveNative(aHostname, flags, attrs, result);
}
NS_IMETHODIMP
nsDNSService::ResolveNative(const nsACString& aHostname, uint32_t flags,
const OriginAttributes& aOriginAttributes,
nsIDNSRecord** result) {
// Synchronous resolution is not available on the main thread.
if (NS_IsMainThread()) {
return NS_ERROR_NOT_AVAILABLE;
}
return ResolveInternal(aHostname, flags, aOriginAttributes, result);
}
nsresult nsDNSService::DeprecatedSyncResolve(
const nsACString& aHostname, uint32_t flags,
const OriginAttributes& aOriginAttributes, nsIDNSRecord** result) {
return ResolveInternal(aHostname, flags, aOriginAttributes, result);
}
nsresult nsDNSService::ResolveInternal(
const nsACString& aHostname, uint32_t flags,
const OriginAttributes& aOriginAttributes, nsIDNSRecord** result) {
// grab reference to global host resolver and IDN service. beware
// simultaneous shutdown!!
RefPtr<nsHostResolver> res;
nsCOMPtr<nsIIDNService> idn;
bool localDomain = false;
{
MutexAutoLock lock(mLock);
res = mResolver;
idn = mIDN;
localDomain = mLocalDomains.GetEntry(aHostname);
}
if (mNotifyResolution) {
NS_DispatchToMainThread(new NotifyDNSResolution(aHostname));
}
NS_ENSURE_TRUE(res, NS_ERROR_OFFLINE);
nsCString hostname;
nsresult rv = PreprocessHostname(localDomain, aHostname, idn, hostname);
if (NS_FAILED(rv)) {
return rv;
}
if (GetOffline() &&
(!mOfflineLocalhost || !hostname.LowerCaseEqualsASCII("localhost"))) {
flags |= RESOLVE_OFFLINE;
}
//
// sync resolve: since the host resolver only works asynchronously, we need
// to use a mutex and a condvar to wait for the result. however, since the
// result may be in the resolvers cache, we might get called back recursively
// on the same thread. so, our mutex needs to be re-entrant. in other words,
// we need to use a monitor! ;-)
//
PRMonitor* mon = PR_NewMonitor();
if (!mon) return NS_ERROR_OUT_OF_MEMORY;
PR_EnterMonitor(mon);
RefPtr<nsDNSSyncRequest> syncReq = new nsDNSSyncRequest(mon);
uint16_t af = GetAFForLookup(hostname, flags);
// TRR uses the main thread for the HTTPS channel to the DoH server.
// If this were to block the main thread while waiting for TRR it would
// likely cause a deadlock. Instead we intentionally choose to not use TRR
// for this.
if (NS_IsMainThread()) {
flags |= RESOLVE_DISABLE_TRR;
}
rv = res->ResolveHost(hostname, EmptyCString(), RESOLVE_TYPE_DEFAULT,
aOriginAttributes, flags, af, syncReq);
if (NS_SUCCEEDED(rv)) {
// wait for result
while (!syncReq->mDone) {
PR_Wait(mon, PR_INTERVAL_NO_TIMEOUT);
}
if (NS_FAILED(syncReq->mStatus)) {
rv = syncReq->mStatus;
} else {
NS_ASSERTION(syncReq->mHostRecord, "no host record");
RefPtr<nsDNSRecord> rec = new nsDNSRecord(syncReq->mHostRecord);
rec.forget(result);
}
}
PR_ExitMonitor(mon);
PR_DestroyMonitor(mon);
return rv;
}
NS_IMETHODIMP
nsDNSService::GetMyHostName(nsACString& result) {
char name[100];
if (PR_GetSystemInfo(PR_SI_HOSTNAME, name, sizeof(name)) == PR_SUCCESS) {
result = name;
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsDNSService::Observe(nsISupports* subject, const char* topic,
const char16_t* data) {
bool flushCache = false;
if (!strcmp(topic, NS_NETWORK_LINK_TOPIC)) {
nsAutoCString converted = NS_ConvertUTF16toUTF8(data);
if (mResolver && !strcmp(converted.get(), NS_NETWORK_LINK_DATA_CHANGED)) {
flushCache = true;
}
} else if (!strcmp(topic, "last-pb-context-exited")) {
flushCache = true;
} else if (!strcmp(topic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
ReadPrefs(NS_ConvertUTF16toUTF8(data).get());
NS_ENSURE_TRUE(mResolver, NS_ERROR_NOT_INITIALIZED);
if (mResolverPrefsUpdated && mResolver) {
mResolver->SetCacheLimits(mResCacheEntries, mResCacheExpiration,
mResCacheGrace);
}
} else if (!strcmp(topic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
Shutdown();
}
if (flushCache) {
mResolver->FlushCache(false);
return NS_OK;
}
return NS_OK;
}
uint16_t nsDNSService::GetAFForLookup(const nsACString& host, uint32_t flags) {
if (mDisableIPv6 || (flags & RESOLVE_DISABLE_IPV6)) return PR_AF_INET;
MutexAutoLock lock(mLock);
uint16_t af = PR_AF_UNSPEC;
if (!mIPv4OnlyDomains.IsEmpty()) {
const char *domain, *domainEnd, *end;
uint32_t hostLen, domainLen;
// see if host is in one of the IPv4-only domains
domain = mIPv4OnlyDomains.BeginReading();
domainEnd = mIPv4OnlyDomains.EndReading();
nsACString::const_iterator hostStart;
host.BeginReading(hostStart);
hostLen = host.Length();
do {
// skip any whitespace
while (*domain == ' ' || *domain == '\t') ++domain;
// find end of this domain in the string
end = strchr(domain, ',');
if (!end) end = domainEnd;
// to see if the hostname is in the domain, check if the domain
// matches the end of the hostname.
domainLen = end - domain;
if (domainLen && hostLen >= domainLen) {
const char* hostTail = hostStart.get() + hostLen - domainLen;
if (PL_strncasecmp(domain, hostTail, domainLen) == 0) {
// now, make sure either that the hostname is a direct match or
// that the hostname begins with a dot.
if (hostLen == domainLen || *hostTail == '.' ||
*(hostTail - 1) == '.') {
af = PR_AF_INET;
break;
}
}
}
domain = end + 1;
} while (*end);
}
if ((af != PR_AF_INET) && (flags & RESOLVE_DISABLE_IPV4)) af = PR_AF_INET6;
return af;
}
NS_IMETHODIMP
nsDNSService::GetDNSCacheEntries(
nsTArray<mozilla::net::DNSCacheEntries>* args) {
NS_ENSURE_TRUE(mResolver, NS_ERROR_NOT_INITIALIZED);
mResolver->GetDNSCacheEntries(args);
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::ClearCache(bool aTrrToo) {
mResolver->FlushCache(aTrrToo);
return NS_OK;
}
NS_IMETHODIMP
nsDNSService::ReloadParentalControlEnabled() {
if (mTrrService) {
mTrrService->GetParentalControlEnabledInternal();
}
return NS_OK;
}
size_t nsDNSService::SizeOfIncludingThis(
mozilla::MallocSizeOf mallocSizeOf) const {
// Measurement of the following members may be added later if DMD finds it
// is worthwhile:
// - mIDN
// - mLock
size_t n = mallocSizeOf(this);
n += mResolver ? mResolver->SizeOfIncludingThis(mallocSizeOf) : 0;
n += mIPv4OnlyDomains.SizeOfExcludingThisIfUnshared(mallocSizeOf);
n += mLocalDomains.SizeOfExcludingThis(mallocSizeOf);
return n;
}
MOZ_DEFINE_MALLOC_SIZE_OF(DNSServiceMallocSizeOf)
NS_IMETHODIMP
nsDNSService::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
MOZ_COLLECT_REPORT("explicit/network/dns-service", KIND_HEAP, UNITS_BYTES,
SizeOfIncludingThis(DNSServiceMallocSizeOf),
"Memory used for the DNS service.");
return NS_OK;
}
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