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gecko-dev/netwerk/base/nsSocketTransportService2.cpp

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// vim:set sw=2 sts=2 et cin:
/* 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 "nsSocketTransportService2.h"
#include "mozilla/Atomics.h"
#include "mozilla/ChaosMode.h"
#include "mozilla/glean/GleanMetrics.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Likely.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/ProfilerThreadSleep.h"
#include "mozilla/PublicSSL.h"
#include "mozilla/ReverseIterator.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/Telemetry.h"
#include "nsASocketHandler.h"
#include "nsError.h"
#include "nsIFile.h"
#include "nsINetworkLinkService.h"
#include "nsIOService.h"
#include "nsIObserverService.h"
#include "nsIWidget.h"
#include "nsServiceManagerUtils.h"
#include "nsSocketTransport2.h"
#include "nsThreadUtils.h"
#include "prerror.h"
#include "prnetdb.h"
namespace mozilla {
namespace net {
#define SOCKET_THREAD_LONGTASK_MS 3
LazyLogModule gSocketTransportLog("nsSocketTransport");
LazyLogModule gUDPSocketLog("UDPSocket");
LazyLogModule gTCPSocketLog("TCPSocket");
nsSocketTransportService* gSocketTransportService = nullptr;
static Atomic<PRThread*, Relaxed> gSocketThread(nullptr);
#define SEND_BUFFER_PREF "network.tcp.sendbuffer"
#define KEEPALIVE_ENABLED_PREF "network.tcp.keepalive.enabled"
#define KEEPALIVE_IDLE_TIME_PREF "network.tcp.keepalive.idle_time"
#define KEEPALIVE_RETRY_INTERVAL_PREF "network.tcp.keepalive.retry_interval"
#define KEEPALIVE_PROBE_COUNT_PREF "network.tcp.keepalive.probe_count"
#define SOCKET_LIMIT_TARGET 1000U
#define MAX_TIME_BETWEEN_TWO_POLLS \
"network.sts.max_time_for_events_between_two_polls"
#define POLL_BUSY_WAIT_PERIOD "network.sts.poll_busy_wait_period"
#define POLL_BUSY_WAIT_PERIOD_TIMEOUT \
"network.sts.poll_busy_wait_period_timeout"
#define MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN \
"network.sts.max_time_for_pr_close_during_shutdown"
#define POLLABLE_EVENT_TIMEOUT "network.sts.pollable_event_timeout"
#define REPAIR_POLLABLE_EVENT_TIME 10
uint32_t nsSocketTransportService::gMaxCount;
PRCallOnceType nsSocketTransportService::gMaxCountInitOnce;
// Utility functions
bool OnSocketThread() { return PR_GetCurrentThread() == gSocketThread; }
//-----------------------------------------------------------------------------
bool nsSocketTransportService::SocketContext::IsTimedOut(
PRIntervalTime now) const {
return TimeoutIn(now) == 0;
}
void nsSocketTransportService::SocketContext::EnsureTimeout(
PRIntervalTime now) {
SOCKET_LOG(("SocketContext::EnsureTimeout socket=%p", mHandler.get()));
if (!mPollStartEpoch) {
SOCKET_LOG((" engaging"));
mPollStartEpoch = now;
}
}
void nsSocketTransportService::SocketContext::DisengageTimeout() {
SOCKET_LOG(("SocketContext::DisengageTimeout socket=%p", mHandler.get()));
mPollStartEpoch = 0;
}
PRIntervalTime nsSocketTransportService::SocketContext::TimeoutIn(
PRIntervalTime now) const {
SOCKET_LOG(("SocketContext::TimeoutIn socket=%p, timeout=%us", mHandler.get(),
mHandler->mPollTimeout));
if (mHandler->mPollTimeout == UINT16_MAX || !mPollStartEpoch) {
SOCKET_LOG((" not engaged"));
return NS_SOCKET_POLL_TIMEOUT;
}
PRIntervalTime elapsed = (now - mPollStartEpoch);
PRIntervalTime timeout = PR_SecondsToInterval(mHandler->mPollTimeout);
if (elapsed >= timeout) {
SOCKET_LOG((" timed out!"));
return 0;
}
SOCKET_LOG((" remains %us", PR_IntervalToSeconds(timeout - elapsed)));
return timeout - elapsed;
}
void nsSocketTransportService::SocketContext::MaybeResetEpoch() {
if (mPollStartEpoch && mHandler->mPollTimeout == UINT16_MAX) {
mPollStartEpoch = 0;
}
}
//-----------------------------------------------------------------------------
// ctor/dtor (called on the main/UI thread by the service manager)
nsSocketTransportService::nsSocketTransportService()
: mPollableEventTimeout(TimeDuration::FromSeconds(6)),
mMaxTimeForPrClosePref(PR_SecondsToInterval(5)),
mNetworkLinkChangeBusyWaitPeriod(PR_SecondsToInterval(50)),
mNetworkLinkChangeBusyWaitTimeout(PR_SecondsToInterval(7)) {
NS_ASSERTION(NS_IsMainThread(), "wrong thread");
PR_CallOnce(&gMaxCountInitOnce, DiscoverMaxCount);
NS_ASSERTION(!gSocketTransportService, "must not instantiate twice");
gSocketTransportService = this;
// The Poll list always has an entry at [0]. The rest of the
// list is a duplicate of the Active list's PRFileDesc file descriptors.
PRPollDesc entry = {nullptr, PR_POLL_READ | PR_POLL_EXCEPT, 0};
mPollList.InsertElementAt(0, entry);
}
void nsSocketTransportService::ApplyPortRemap(uint16_t* aPort) {
MOZ_ASSERT(IsOnCurrentThreadInfallible());
if (!mPortRemapping) {
return;
}
// Reverse the array to make later rules override earlier rules.
for (auto const& portMapping : Reversed(*mPortRemapping)) {
if (*aPort < std::get<0>(portMapping)) {
continue;
}
if (*aPort > std::get<1>(portMapping)) {
continue;
}
*aPort = std::get<2>(portMapping);
return;
}
}
bool nsSocketTransportService::UpdatePortRemapPreference(
nsACString const& aPortMappingPref) {
TPortRemapping portRemapping;
auto consumePreference = [&]() -> bool {
Tokenizer tokenizer(aPortMappingPref);
tokenizer.SkipWhites();
if (tokenizer.CheckEOF()) {
return true;
}
nsTArray<std::tuple<uint16_t, uint16_t>> ranges(2);
while (true) {
uint16_t loPort;
tokenizer.SkipWhites();
if (!tokenizer.ReadInteger(&loPort)) {
break;
}
uint16_t hiPort;
tokenizer.SkipWhites();
if (tokenizer.CheckChar('-')) {
tokenizer.SkipWhites();
if (!tokenizer.ReadInteger(&hiPort)) {
break;
}
} else {
hiPort = loPort;
}
ranges.AppendElement(std::make_tuple(loPort, hiPort));
tokenizer.SkipWhites();
if (tokenizer.CheckChar(',')) {
continue; // another port or port range is expected
}
if (tokenizer.CheckChar('=')) {
uint16_t targetPort;
tokenizer.SkipWhites();
if (!tokenizer.ReadInteger(&targetPort)) {
break;
}
// Storing reversed, because the most common cases (like 443) will very
// likely be listed as first, less common cases will be added to the end
// of the list mapping to the same port. As we iterate the whole
// remapping array from the end, this may have a small perf win by
// hitting the most common cases earlier.
for (auto const& range : Reversed(ranges)) {
portRemapping.AppendElement(std::make_tuple(
std::get<0>(range), std::get<1>(range), targetPort));
}
ranges.Clear();
tokenizer.SkipWhites();
if (tokenizer.CheckChar(';')) {
continue; // more mappings (or EOF) expected
}
if (tokenizer.CheckEOF()) {
return true;
}
}
// Anything else is unexpected.
break;
}
// 'break' from the parsing loop means ill-formed preference
portRemapping.Clear();
return false;
};
bool rv = consumePreference();
if (!IsOnCurrentThread()) {
nsCOMPtr<nsIThread> thread = GetThreadSafely();
if (!thread) {
// Init hasn't been called yet. Could probably just assert.
// If shutdown, the dispatch below will just silently fail.
NS_ASSERTION(false, "ApplyPortRemapPreference before STS::Init");
return false;
}
thread->Dispatch(NewRunnableMethod<TPortRemapping>(
"net::ApplyPortRemapping", this,
&nsSocketTransportService::ApplyPortRemapPreference, portRemapping));
} else {
ApplyPortRemapPreference(portRemapping);
}
return rv;
}
nsSocketTransportService::~nsSocketTransportService() {
NS_ASSERTION(NS_IsMainThread(), "wrong thread");
NS_ASSERTION(!mInitialized, "not shutdown properly");
gSocketTransportService = nullptr;
}
//-----------------------------------------------------------------------------
// event queue (any thread)
already_AddRefed<nsIThread> nsSocketTransportService::GetThreadSafely() {
MutexAutoLock lock(mLock);
nsCOMPtr<nsIThread> result = mThread;
return result.forget();
}
NS_IMETHODIMP
nsSocketTransportService::DispatchFromScript(nsIRunnable* event,
uint32_t flags) {
nsCOMPtr<nsIRunnable> event_ref(event);
return Dispatch(event_ref.forget(), flags);
}
NS_IMETHODIMP
nsSocketTransportService::Dispatch(already_AddRefed<nsIRunnable> event,
uint32_t flags) {
nsCOMPtr<nsIRunnable> event_ref(event);
SOCKET_LOG(("STS dispatch [%p]\n", event_ref.get()));
nsCOMPtr<nsIThread> thread = GetThreadSafely();
nsresult rv;
rv = thread ? thread->Dispatch(event_ref.forget(), flags)
: NS_ERROR_NOT_INITIALIZED;
if (rv == NS_ERROR_UNEXPECTED) {
// Thread is no longer accepting events. We must have just shut it
// down on the main thread. Pretend we never saw it.
rv = NS_ERROR_NOT_INITIALIZED;
}
return rv;
}
NS_IMETHODIMP
nsSocketTransportService::DelayedDispatch(already_AddRefed<nsIRunnable>,
uint32_t) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsSocketTransportService::RegisterShutdownTask(nsITargetShutdownTask* task) {
nsCOMPtr<nsIThread> thread = GetThreadSafely();
return thread ? thread->RegisterShutdownTask(task) : NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsSocketTransportService::UnregisterShutdownTask(nsITargetShutdownTask* task) {
nsCOMPtr<nsIThread> thread = GetThreadSafely();
return thread ? thread->UnregisterShutdownTask(task) : NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsSocketTransportService::IsOnCurrentThread(bool* result) {
*result = OnSocketThread();
return NS_OK;
}
NS_IMETHODIMP_(bool)
nsSocketTransportService::IsOnCurrentThreadInfallible() {
return OnSocketThread();
}
//-----------------------------------------------------------------------------
// nsIDirectTaskDispatcher
already_AddRefed<nsIDirectTaskDispatcher>
nsSocketTransportService::GetDirectTaskDispatcherSafely() {
MutexAutoLock lock(mLock);
nsCOMPtr<nsIDirectTaskDispatcher> result = mDirectTaskDispatcher;
return result.forget();
}
NS_IMETHODIMP
nsSocketTransportService::DispatchDirectTask(
already_AddRefed<nsIRunnable> aEvent) {
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher =
GetDirectTaskDispatcherSafely();
NS_ENSURE_TRUE(dispatcher, NS_ERROR_NOT_INITIALIZED);
return dispatcher->DispatchDirectTask(std::move(aEvent));
}
NS_IMETHODIMP nsSocketTransportService::DrainDirectTasks() {
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher =
GetDirectTaskDispatcherSafely();
if (!dispatcher) {
// nothing to drain.
return NS_OK;
}
return dispatcher->DrainDirectTasks();
}
NS_IMETHODIMP nsSocketTransportService::HaveDirectTasks(bool* aValue) {
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher =
GetDirectTaskDispatcherSafely();
if (!dispatcher) {
*aValue = false;
return NS_OK;
}
return dispatcher->HaveDirectTasks(aValue);
}
//-----------------------------------------------------------------------------
// socket api (socket thread only)
NS_IMETHODIMP
nsSocketTransportService::NotifyWhenCanAttachSocket(nsIRunnable* event) {
SOCKET_LOG(("nsSocketTransportService::NotifyWhenCanAttachSocket\n"));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (CanAttachSocket()) {
return Dispatch(event, NS_DISPATCH_NORMAL);
}
auto* runnable = new LinkedRunnableEvent(event);
mPendingSocketQueue.insertBack(runnable);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::AttachSocket(PRFileDesc* fd,
nsASocketHandler* handler) {
SOCKET_LOG(
("nsSocketTransportService::AttachSocket [handler=%p]\n", handler));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (!CanAttachSocket()) {
return NS_ERROR_NOT_AVAILABLE;
}
SocketContext sock{fd, handler, 0};
AddToIdleList(&sock);
return NS_OK;
}
// the number of sockets that can be attached at any given time is
// limited. this is done because some operating systems (e.g., Win9x)
// limit the number of sockets that can be created by an application.
// AttachSocket will fail if the limit is exceeded. consumers should
// call CanAttachSocket and check the result before creating a socket.
bool nsSocketTransportService::CanAttachSocket() {
MOZ_ASSERT(!mShuttingDown);
uint32_t total = mActiveList.Length() + mIdleList.Length();
bool rv = total < gMaxCount;
if (!rv) {
static bool reported_socket_limit_reached = false;
if (!reported_socket_limit_reached) {
mozilla::glean::networking::os_socket_limit_reached.Add(1);
reported_socket_limit_reached = true;
}
SOCKET_LOG(
("nsSocketTransportService::CanAttachSocket failed - total: %d, "
"maxCount: %d\n",
total, gMaxCount));
}
MOZ_ASSERT(mInitialized);
return rv;
}
nsresult nsSocketTransportService::DetachSocket(SocketContextList& listHead,
SocketContext* sock) {
SOCKET_LOG(("nsSocketTransportService::DetachSocket [handler=%p]\n",
sock->mHandler.get()));
MOZ_ASSERT((&listHead == &mActiveList) || (&listHead == &mIdleList),
"DetachSocket invalid head");
{
// inform the handler that this socket is going away
sock->mHandler->OnSocketDetached(sock->mFD);
}
mSentBytesCount += sock->mHandler->ByteCountSent();
mReceivedBytesCount += sock->mHandler->ByteCountReceived();
// cleanup
sock->mFD = nullptr;
if (&listHead == &mActiveList) {
RemoveFromPollList(sock);
} else {
RemoveFromIdleList(sock);
}
// NOTE: sock is now an invalid pointer
//
// notify the first element on the pending socket queue...
//
nsCOMPtr<nsIRunnable> event;
LinkedRunnableEvent* runnable = mPendingSocketQueue.getFirst();
if (runnable) {
event = runnable->TakeEvent();
runnable->remove();
delete runnable;
}
if (event) {
// move event from pending queue to dispatch queue
return Dispatch(event, NS_DISPATCH_NORMAL);
}
return NS_OK;
}
// Returns the index of a SocketContext within a list, or -1 if it's
// not a pointer to a list element
// NOTE: this could be supplied by nsTArray<>
int64_t nsSocketTransportService::SockIndex(SocketContextList& aList,
SocketContext* aSock) {
ptrdiff_t index = -1;
if (!aList.IsEmpty()) {
index = aSock - &aList[0];
if (index < 0 || (size_t)index + 1 > aList.Length()) {
index = -1;
}
}
return (int64_t)index;
}
void nsSocketTransportService::AddToPollList(SocketContext* sock) {
MOZ_ASSERT(SockIndex(mActiveList, sock) == -1,
"AddToPollList Socket Already Active");
SOCKET_LOG(("nsSocketTransportService::AddToPollList %p [handler=%p]\n", sock,
sock->mHandler.get()));
sock->EnsureTimeout(PR_IntervalNow());
PRPollDesc poll;
poll.fd = sock->mFD;
poll.in_flags = sock->mHandler->mPollFlags;
poll.out_flags = 0;
if (ChaosMode::isActive(ChaosFeature::NetworkScheduling)) {
auto newSocketIndex = mActiveList.Length();
newSocketIndex = ChaosMode::randomUint32LessThan(newSocketIndex + 1);
mActiveList.InsertElementAt(newSocketIndex, *sock);
// mPollList is offset by 1
mPollList.InsertElementAt(newSocketIndex + 1, poll);
} else {
// Avoid refcount bump/decrease
mActiveList.EmplaceBack(sock->mFD, sock->mHandler.forget(),
sock->mPollStartEpoch);
mPollList.AppendElement(poll);
}
SOCKET_LOG(
(" active=%zu idle=%zu\n", mActiveList.Length(), mIdleList.Length()));
}
void nsSocketTransportService::RemoveFromPollList(SocketContext* sock) {
SOCKET_LOG(("nsSocketTransportService::RemoveFromPollList %p [handler=%p]\n",
sock, sock->mHandler.get()));
auto index = SockIndex(mActiveList, sock);
MOZ_RELEASE_ASSERT(index != -1, "invalid index");
SOCKET_LOG((" index=%" PRId64 " mActiveList.Length()=%zu\n", index,
mActiveList.Length()));
mActiveList.UnorderedRemoveElementAt(index);
// mPollList is offset by 1
mPollList.UnorderedRemoveElementAt(index + 1);
SOCKET_LOG(
(" active=%zu idle=%zu\n", mActiveList.Length(), mIdleList.Length()));
}
void nsSocketTransportService::AddToIdleList(SocketContext* sock) {
MOZ_ASSERT(SockIndex(mIdleList, sock) == -1,
"AddToIdleList Socket Already Idle");
SOCKET_LOG(("nsSocketTransportService::AddToIdleList %p [handler=%p]\n", sock,
sock->mHandler.get()));
// Avoid refcount bump/decrease
mIdleList.EmplaceBack(sock->mFD, sock->mHandler.forget(),
sock->mPollStartEpoch);
SOCKET_LOG(
(" active=%zu idle=%zu\n", mActiveList.Length(), mIdleList.Length()));
}
void nsSocketTransportService::RemoveFromIdleList(SocketContext* sock) {
SOCKET_LOG(("nsSocketTransportService::RemoveFromIdleList [handler=%p]\n",
sock->mHandler.get()));
auto index = SockIndex(mIdleList, sock);
MOZ_RELEASE_ASSERT(index != -1);
mIdleList.UnorderedRemoveElementAt(index);
SOCKET_LOG(
(" active=%zu idle=%zu\n", mActiveList.Length(), mIdleList.Length()));
}
void nsSocketTransportService::MoveToIdleList(SocketContext* sock) {
SOCKET_LOG(("nsSocketTransportService::MoveToIdleList %p [handler=%p]\n",
sock, sock->mHandler.get()));
MOZ_ASSERT(SockIndex(mIdleList, sock) == -1);
MOZ_ASSERT(SockIndex(mActiveList, sock) != -1);
AddToIdleList(sock);
RemoveFromPollList(sock);
}
void nsSocketTransportService::MoveToPollList(SocketContext* sock) {
SOCKET_LOG(("nsSocketTransportService::MoveToPollList %p [handler=%p]\n",
sock, sock->mHandler.get()));
MOZ_ASSERT(SockIndex(mIdleList, sock) != -1);
MOZ_ASSERT(SockIndex(mActiveList, sock) == -1);
AddToPollList(sock);
RemoveFromIdleList(sock);
}
void nsSocketTransportService::ApplyPortRemapPreference(
TPortRemapping const& portRemapping) {
MOZ_ASSERT(IsOnCurrentThreadInfallible());
mPortRemapping.reset();
if (!portRemapping.IsEmpty()) {
mPortRemapping.emplace(portRemapping);
}
}
PRIntervalTime nsSocketTransportService::PollTimeout(PRIntervalTime now) {
if (mActiveList.IsEmpty()) {
return NS_SOCKET_POLL_TIMEOUT;
}
// compute minimum time before any socket timeout expires.
PRIntervalTime minR = NS_SOCKET_POLL_TIMEOUT;
for (uint32_t i = 0; i < mActiveList.Length(); ++i) {
const SocketContext& s = mActiveList[i];
PRIntervalTime r = s.TimeoutIn(now);
if (r < minR) {
minR = r;
}
}
if (minR == NS_SOCKET_POLL_TIMEOUT) {
SOCKET_LOG(("poll timeout: none\n"));
return NS_SOCKET_POLL_TIMEOUT;
}
SOCKET_LOG(("poll timeout: %" PRIu32 "\n", PR_IntervalToSeconds(minR)));
return minR;
}
int32_t nsSocketTransportService::Poll(TimeDuration* pollDuration,
PRIntervalTime ts) {
MOZ_ASSERT(IsOnCurrentThread());
PRPollDesc* firstPollEntry;
uint32_t pollCount;
PRIntervalTime pollTimeout;
*pollDuration = nullptr;
// If there are pending events for this thread then
// DoPollIteration() should service the network without blocking.
bool pendingEvents = false;
mRawThread->HasPendingEvents(&pendingEvents);
if (mPollList[0].fd) {
mPollList[0].out_flags = 0;
firstPollEntry = &mPollList[0];
pollCount = mPollList.Length();
pollTimeout = pendingEvents ? PR_INTERVAL_NO_WAIT : PollTimeout(ts);
} else {
// no pollable event, so busy wait...
pollCount = mActiveList.Length();
if (pollCount) {
firstPollEntry = &mPollList[1];
} else {
firstPollEntry = nullptr;
}
pollTimeout =
pendingEvents ? PR_INTERVAL_NO_WAIT : PR_MillisecondsToInterval(25);
}
if ((ts - mLastNetworkLinkChangeTime) < mNetworkLinkChangeBusyWaitPeriod) {
// Being here means we are few seconds after a network change has
// been detected.
PRIntervalTime to = mNetworkLinkChangeBusyWaitTimeout;
if (to) {
pollTimeout = std::min(to, pollTimeout);
SOCKET_LOG((" timeout shorthened after network change event"));
}
}
TimeStamp pollStart;
if (Telemetry::CanRecordPrereleaseData()) {
pollStart = TimeStamp::NowLoRes();
}
SOCKET_LOG((" timeout = %i milliseconds\n",
PR_IntervalToMilliseconds(pollTimeout)));
int32_t n;
{
#ifdef MOZ_GECKO_PROFILER
TimeStamp startTime = TimeStamp::Now();
if (pollTimeout != PR_INTERVAL_NO_WAIT) {
// There will be an actual non-zero wait, let the profiler know about it
// by marking thread as sleeping around the polling call.
profiler_thread_sleep();
}
#endif
n = PR_Poll(firstPollEntry, pollCount, pollTimeout);
#ifdef MOZ_GECKO_PROFILER
if (pollTimeout != PR_INTERVAL_NO_WAIT) {
profiler_thread_wake();
}
if (profiler_thread_is_being_profiled_for_markers()) {
PROFILER_MARKER_TEXT(
"SocketTransportService::Poll", NETWORK,
MarkerTiming::IntervalUntilNowFrom(startTime),
pollTimeout == PR_INTERVAL_NO_TIMEOUT
? nsPrintfCString("Poll count: %u, Poll timeout: NO_TIMEOUT",
pollCount)
: pollTimeout == PR_INTERVAL_NO_WAIT
? nsPrintfCString("Poll count: %u, Poll timeout: NO_WAIT",
pollCount)
: nsPrintfCString("Poll count: %u, Poll timeout: %ums", pollCount,
PR_IntervalToMilliseconds(pollTimeout)));
}
#endif
}
if (Telemetry::CanRecordPrereleaseData() && !pollStart.IsNull()) {
*pollDuration = TimeStamp::NowLoRes() - pollStart;
}
SOCKET_LOG((" ...returned after %i milliseconds\n",
PR_IntervalToMilliseconds(PR_IntervalNow() - ts)));
return n;
}
//-----------------------------------------------------------------------------
// xpcom api
NS_IMPL_ISUPPORTS(nsSocketTransportService, nsISocketTransportService,
nsIRoutedSocketTransportService, nsIEventTarget,
nsISerialEventTarget, nsIThreadObserver, nsIRunnable,
nsPISocketTransportService, nsIObserver, nsINamed,
nsIDirectTaskDispatcher)
static const char* gCallbackPrefs[] = {
SEND_BUFFER_PREF,
KEEPALIVE_ENABLED_PREF,
KEEPALIVE_IDLE_TIME_PREF,
KEEPALIVE_RETRY_INTERVAL_PREF,
KEEPALIVE_PROBE_COUNT_PREF,
MAX_TIME_BETWEEN_TWO_POLLS,
MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN,
POLLABLE_EVENT_TIMEOUT,
"network.socket.forcePort",
nullptr,
};
/* static */
void nsSocketTransportService::UpdatePrefs(const char* aPref, void* aSelf) {
static_cast<nsSocketTransportService*>(aSelf)->UpdatePrefs();
}
static uint32_t GetThreadStackSize() {
#ifdef XP_WIN
if (!StaticPrefs::network_allow_large_stack_size_for_socket_thread()) {
return nsIThreadManager::DEFAULT_STACK_SIZE;
}
const uint32_t kWindowsThreadStackSize = 512 * 1024;
// We can remove this custom stack size when DEFAULT_STACK_SIZE is increased.
static_assert(kWindowsThreadStackSize > nsIThreadManager::DEFAULT_STACK_SIZE);
return kWindowsThreadStackSize;
#else
return nsIThreadManager::DEFAULT_STACK_SIZE;
#endif
}
// called from main thread only
NS_IMETHODIMP
nsSocketTransportService::Init() {
if (!NS_IsMainThread()) {
NS_ERROR("wrong thread");
return NS_ERROR_UNEXPECTED;
}
if (mInitialized) {
return NS_OK;
}
if (mShuttingDown) {
return NS_ERROR_UNEXPECTED;
}
nsCOMPtr<nsIThread> thread;
if (!XRE_IsContentProcess() ||
StaticPrefs::network_allow_raw_sockets_in_content_processes_AtStartup()) {
// Since we Poll, we can't use normal LongTask support in Main Process
nsresult rv = NS_NewNamedThread(
"Socket Thread", getter_AddRefs(thread), this,
{GetThreadStackSize(), false, false, Some(SOCKET_THREAD_LONGTASK_MS)});
NS_ENSURE_SUCCESS(rv, rv);
} else {
// In the child process, we just want a regular nsThread with no socket
// polling. So we don't want to run the nsSocketTransportService runnable on
// it.
nsresult rv =
NS_NewNamedThread("Socket Thread", getter_AddRefs(thread), nullptr,
{nsIThreadManager::DEFAULT_STACK_SIZE, false, false,
Some(SOCKET_THREAD_LONGTASK_MS)});
NS_ENSURE_SUCCESS(rv, rv);
// Set up some of the state that nsSocketTransportService::Run would set.
PRThread* prthread = nullptr;
thread->GetPRThread(&prthread);
gSocketThread = prthread;
mRawThread = thread;
}
{
MutexAutoLock lock(mLock);
// Install our mThread, protecting against concurrent readers
thread.swap(mThread);
mDirectTaskDispatcher = do_QueryInterface(mThread);
MOZ_DIAGNOSTIC_ASSERT(
mDirectTaskDispatcher,
"Underlying thread must support direct task dispatching");
}
Preferences::RegisterCallbacks(UpdatePrefs, gCallbackPrefs, this);
UpdatePrefs();
nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
// Note that the observr notifications are forwarded from parent process to
// socket process. We have to make sure the topics registered below are also
// registered in nsIObserver::Init().
if (obsSvc) {
obsSvc->AddObserver(this, "last-pb-context-exited", false);
obsSvc->AddObserver(this, NS_WIDGET_SLEEP_OBSERVER_TOPIC, true);
obsSvc->AddObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC, true);
obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
obsSvc->AddObserver(this, NS_NETWORK_LINK_TOPIC, false);
}
// We can now dispatch tasks to the socket thread.
mInitialized = true;
return NS_OK;
}
// called from main thread only
NS_IMETHODIMP
nsSocketTransportService::Shutdown(bool aXpcomShutdown) {
SOCKET_LOG(("nsSocketTransportService::Shutdown\n"));
NS_ENSURE_STATE(NS_IsMainThread());
if (!mInitialized || mShuttingDown) {
// We never inited, or shutdown has already started
return NS_OK;
}
{
auto observersCopy = mShutdownObservers;
for (auto& observer : observersCopy) {
observer->Observe();
}
}
mShuttingDown = true;
{
MutexAutoLock lock(mLock);
if (mPollableEvent) {
mPollableEvent->Signal();
}
}
// If we're shutting down due to going offline (rather than due to XPCOM
// shutdown), also tear down the thread. The thread will be shutdown during
// xpcom-shutdown-threads if during xpcom-shutdown proper.
if (!aXpcomShutdown) {
ShutdownThread();
}
return NS_OK;
}
nsresult nsSocketTransportService::ShutdownThread() {
SOCKET_LOG(("nsSocketTransportService::ShutdownThread\n"));
NS_ENSURE_STATE(NS_IsMainThread());
if (!mInitialized) {
return NS_OK;
}
// join with thread
nsCOMPtr<nsIThread> thread = GetThreadSafely();
thread->Shutdown();
{
MutexAutoLock lock(mLock);
// Drop our reference to mThread and make sure that any concurrent readers
// are excluded
mThread = nullptr;
mDirectTaskDispatcher = nullptr;
}
Preferences::UnregisterCallbacks(UpdatePrefs, gCallbackPrefs, this);
nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
if (obsSvc) {
obsSvc->RemoveObserver(this, "last-pb-context-exited");
obsSvc->RemoveObserver(this, NS_WIDGET_SLEEP_OBSERVER_TOPIC);
obsSvc->RemoveObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC);
obsSvc->RemoveObserver(this, "xpcom-shutdown-threads");
obsSvc->RemoveObserver(this, NS_NETWORK_LINK_TOPIC);
}
if (mAfterWakeUpTimer) {
mAfterWakeUpTimer->Cancel();
mAfterWakeUpTimer = nullptr;
}
mInitialized = false;
mShuttingDown = false;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetOffline(bool* offline) {
MutexAutoLock lock(mLock);
*offline = mOffline;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::SetOffline(bool offline) {
MutexAutoLock lock(mLock);
if (!mOffline && offline) {
// signal the socket thread to go offline, so it will detach sockets
mGoingOffline = true;
mOffline = true;
} else if (mOffline && !offline) {
mOffline = false;
}
if (mPollableEvent) {
mPollableEvent->Signal();
}
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveIdleTime(int32_t* aKeepaliveIdleTimeS) {
MOZ_ASSERT(aKeepaliveIdleTimeS);
if (NS_WARN_IF(!aKeepaliveIdleTimeS)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveIdleTimeS = mKeepaliveIdleTimeS;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveRetryInterval(
int32_t* aKeepaliveRetryIntervalS) {
MOZ_ASSERT(aKeepaliveRetryIntervalS);
if (NS_WARN_IF(!aKeepaliveRetryIntervalS)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveRetryIntervalS = mKeepaliveRetryIntervalS;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::GetKeepaliveProbeCount(
int32_t* aKeepaliveProbeCount) {
MOZ_ASSERT(aKeepaliveProbeCount);
if (NS_WARN_IF(!aKeepaliveProbeCount)) {
return NS_ERROR_NULL_POINTER;
}
*aKeepaliveProbeCount = mKeepaliveProbeCount;
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::CreateTransport(const nsTArray<nsCString>& types,
const nsACString& host, int32_t port,
nsIProxyInfo* proxyInfo,
nsIDNSRecord* dnsRecord,
nsISocketTransport** result) {
return CreateRoutedTransport(types, host, port, ""_ns, 0, proxyInfo,
dnsRecord, result);
}
NS_IMETHODIMP
nsSocketTransportService::CreateRoutedTransport(
const nsTArray<nsCString>& types, const nsACString& host, int32_t port,
const nsACString& hostRoute, int32_t portRoute, nsIProxyInfo* proxyInfo,
nsIDNSRecord* dnsRecord, nsISocketTransport** result) {
NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
NS_ENSURE_TRUE(port >= 0 && port <= 0xFFFF, NS_ERROR_ILLEGAL_VALUE);
RefPtr<nsSocketTransport> trans = new nsSocketTransport();
nsresult rv = trans->Init(types, host, port, hostRoute, portRoute, proxyInfo,
dnsRecord);
if (NS_FAILED(rv)) {
return rv;
}
trans.forget(result);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::CreateUnixDomainTransport(
nsIFile* aPath, nsISocketTransport** result) {
#ifdef XP_UNIX
nsresult rv;
NS_ENSURE_TRUE(mInitialized, NS_ERROR_NOT_INITIALIZED);
nsAutoCString path;
rv = aPath->GetNativePath(path);
NS_ENSURE_SUCCESS(rv, rv);
RefPtr<nsSocketTransport> trans = new nsSocketTransport();
rv = trans->InitWithFilename(path.get());
NS_ENSURE_SUCCESS(rv, rv);
trans.forget(result);
return NS_OK;
#else
return NS_ERROR_SOCKET_ADDRESS_NOT_SUPPORTED;
#endif
}
NS_IMETHODIMP
nsSocketTransportService::CreateUnixDomainAbstractAddressTransport(
const nsACString& aName, nsISocketTransport** result) {
// Abstract socket address is supported on Linux only
#ifdef XP_LINUX
RefPtr<nsSocketTransport> trans = new nsSocketTransport();
// First character of Abstract socket address is null
UniquePtr<char[]> name(new char[aName.Length() + 1]);
*(name.get()) = 0;
memcpy(name.get() + 1, aName.BeginReading(), aName.Length());
nsresult rv = trans->InitWithName(name.get(), aName.Length() + 1);
if (NS_FAILED(rv)) {
return rv;
}
trans.forget(result);
return NS_OK;
#else
return NS_ERROR_SOCKET_ADDRESS_NOT_SUPPORTED;
#endif
}
NS_IMETHODIMP
nsSocketTransportService::OnDispatchedEvent() {
#ifndef XP_WIN
// On windows poll can hang and this became worse when we introduced the
// patch for bug 698882 (see also bug 1292181), therefore we reverted the
// behavior on windows to be as before bug 698882, e.g. write to the socket
// also if an event dispatch is on the socket thread and writing to the
// socket for each event.
if (OnSocketThread()) {
// this check is redundant to one done inside ::Signal(), but
// we can do it here and skip obtaining the lock - given that
// this is a relatively common occurance its worth the
// redundant code
SOCKET_LOG(("OnDispatchedEvent Same Thread Skip Signal\n"));
return NS_OK;
}
#else
if (gIOService->IsNetTearingDown()) {
// Poll can hang sometimes. If we are in shutdown, we are going to
// start a watchdog. If we do not exit poll within
// REPAIR_POLLABLE_EVENT_TIME signal a pollable event again.
StartPollWatchdog();
}
#endif
MutexAutoLock lock(mLock);
if (mPollableEvent) {
mPollableEvent->Signal();
}
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::OnProcessNextEvent(nsIThreadInternal* thread,
bool mayWait) {
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::AfterProcessNextEvent(nsIThreadInternal* thread,
bool eventWasProcessed) {
return NS_OK;
}
void nsSocketTransportService::MarkTheLastElementOfPendingQueue() {
mServingPendingQueue = false;
}
NS_IMETHODIMP
nsSocketTransportService::Run() {
SOCKET_LOG(("STS thread init %d sockets\n", gMaxCount));
#if defined(XP_WIN)
// see bug 1361495, gethostname() triggers winsock initialization.
// so do it here (on parent and child) to protect against it being done first
// accidentally on the main thread.. especially via PR_GetSystemInfo(). This
// will also improve latency of first real winsock operation
// ..
// If STS-thread is no longer needed this should still be run before exiting
char ignoredStackBuffer[255];
Unused << gethostname(ignoredStackBuffer, 255);
#endif
psm::InitializeSSLServerCertVerificationThreads();
gSocketThread = PR_GetCurrentThread();
{
// See bug 1843384:
// Avoid blocking the main thread by allocating the PollableEvent outside
// the mutex. Still has the potential to hang the socket thread, but the
// main thread remains responsive.
PollableEvent* pollable = new PollableEvent();
MutexAutoLock lock(mLock);
mPollableEvent.reset(pollable);
//
// NOTE: per bug 190000, this failure could be caused by Zone-Alarm
// or similar software.
//
// NOTE: per bug 191739, this failure could also be caused by lack
// of a loopback device on Windows and OS/2 platforms (it creates
// a loopback socket pair on these platforms to implement a pollable
// event object). if we can't create a pollable event, then we'll
// have to "busy wait" to implement the socket event queue :-(
//
if (!mPollableEvent->Valid()) {
mPollableEvent = nullptr;
NS_WARNING("running socket transport thread without a pollable event");
SOCKET_LOG(("running socket transport thread without a pollable event"));
}
PRPollDesc entry = {mPollableEvent ? mPollableEvent->PollableFD() : nullptr,
PR_POLL_READ | PR_POLL_EXCEPT, 0};
SOCKET_LOG(("Setting entry 0"));
mPollList[0] = entry;
}
mRawThread = NS_GetCurrentThread();
// Ensure a call to GetCurrentSerialEventTarget() returns this event target.
SerialEventTargetGuard guard(this);
// hook ourselves up to observe event processing for this thread
nsCOMPtr<nsIThreadInternal> threadInt = do_QueryInterface(mRawThread);
threadInt->SetObserver(this);
// make sure the pseudo random number generator is seeded on this thread
srand(static_cast<unsigned>(PR_Now()));
// For the calculation of the duration of the last cycle (i.e. the last
// for-loop iteration before shutdown).
TimeStamp startOfCycleForLastCycleCalc;
// For measuring of the poll iteration duration without time spent blocked
// in poll().
TimeStamp pollCycleStart;
// Time blocked in poll().
TimeDuration singlePollDuration;
// For calculating the time needed for a new element to run.
TimeStamp startOfIteration;
TimeStamp startOfNextIteration;
// If there is too many pending events queued, we will run some poll()
// between them and the following variable is cumulative time spent
// blocking in poll().
TimeDuration pollDuration;
for (;;) {
bool pendingEvents = false;
if (Telemetry::CanRecordPrereleaseData()) {
startOfCycleForLastCycleCalc = TimeStamp::NowLoRes();
startOfNextIteration = TimeStamp::NowLoRes();
}
pollDuration = nullptr;
// We pop out to this loop when there are no pending events.
// If we don't reset these, we may not re-enter ProcessNextEvent()
// until we have events to process, and it may seem like we have
// an event running for a very long time.
mRawThread->SetRunningEventDelay(TimeDuration(), TimeStamp());
do {
if (Telemetry::CanRecordPrereleaseData()) {
pollCycleStart = TimeStamp::NowLoRes();
}
DoPollIteration(&singlePollDuration);
if (Telemetry::CanRecordPrereleaseData() && !pollCycleStart.IsNull()) {
Telemetry::Accumulate(Telemetry::STS_POLL_BLOCK_TIME,
singlePollDuration.ToMilliseconds());
Telemetry::AccumulateTimeDelta(Telemetry::STS_POLL_CYCLE,
pollCycleStart + singlePollDuration,
TimeStamp::NowLoRes());
pollDuration += singlePollDuration;
}
mRawThread->HasPendingEvents(&pendingEvents);
if (pendingEvents) {
if (!mServingPendingQueue) {
nsresult rv = Dispatch(
NewRunnableMethod(
"net::nsSocketTransportService::"
"MarkTheLastElementOfPendingQueue",
this,
&nsSocketTransportService::MarkTheLastElementOfPendingQueue),
nsIEventTarget::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING(
"Could not dispatch a new event on the "
"socket thread.");
} else {
mServingPendingQueue = true;
}
if (Telemetry::CanRecordPrereleaseData()) {
startOfIteration = startOfNextIteration;
// Everything that comes after this point will
// be served in the next iteration. If no even
// arrives, startOfNextIteration will be reset at the
// beginning of each for-loop.
startOfNextIteration = TimeStamp::NowLoRes();
}
}
TimeStamp eventQueueStart = TimeStamp::NowLoRes();
do {
NS_ProcessNextEvent(mRawThread);
pendingEvents = false;
mRawThread->HasPendingEvents(&pendingEvents);
} while (pendingEvents && mServingPendingQueue &&
((TimeStamp::NowLoRes() - eventQueueStart).ToMilliseconds() <
mMaxTimePerPollIter));
if (Telemetry::CanRecordPrereleaseData() && !mServingPendingQueue &&
!startOfIteration.IsNull()) {
Telemetry::AccumulateTimeDelta(Telemetry::STS_POLL_AND_EVENTS_CYCLE,
startOfIteration + pollDuration,
TimeStamp::NowLoRes());
pollDuration = nullptr;
}
}
} while (pendingEvents);
bool goingOffline = false;
// now that our event queue is empty, check to see if we should exit
if (mShuttingDown) {
if (Telemetry::CanRecordPrereleaseData() &&
!startOfCycleForLastCycleCalc.IsNull()) {
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_AND_EVENT_THE_LAST_CYCLE,
startOfCycleForLastCycleCalc, TimeStamp::NowLoRes());
}
break;
}
{
MutexAutoLock lock(mLock);
if (mGoingOffline) {
mGoingOffline = false;
goingOffline = true;
}
}
// Avoid potential deadlock
if (goingOffline) {
Reset(true);
}
}
SOCKET_LOG(("STS shutting down thread\n"));
// detach all sockets, including locals
Reset(false);
// We don't clear gSocketThread so that OnSocketThread() won't be a false
// alarm for events generated by stopping the SSL threads during shutdown.
psm::StopSSLServerCertVerificationThreads();
// Final pass over the event queue. This makes sure that events posted by
// socket detach handlers get processed.
NS_ProcessPendingEvents(mRawThread);
SOCKET_LOG(("STS thread exit\n"));
MOZ_ASSERT(mPollList.Length() == 1);
MOZ_ASSERT(mActiveList.IsEmpty());
MOZ_ASSERT(mIdleList.IsEmpty());
return NS_OK;
}
void nsSocketTransportService::DetachSocketWithGuard(
bool aGuardLocals, SocketContextList& socketList, int32_t index) {
bool isGuarded = false;
if (aGuardLocals) {
socketList[index].mHandler->IsLocal(&isGuarded);
if (!isGuarded) {
socketList[index].mHandler->KeepWhenOffline(&isGuarded);
}
}
if (!isGuarded) {
DetachSocket(socketList, &socketList[index]);
}
}
void nsSocketTransportService::Reset(bool aGuardLocals) {
// detach any sockets
int32_t i;
for (i = mActiveList.Length() - 1; i >= 0; --i) {
DetachSocketWithGuard(aGuardLocals, mActiveList, i);
}
for (i = mIdleList.Length() - 1; i >= 0; --i) {
DetachSocketWithGuard(aGuardLocals, mIdleList, i);
}
}
nsresult nsSocketTransportService::DoPollIteration(TimeDuration* pollDuration) {
SOCKET_LOG(("STS poll iter\n"));
PRIntervalTime now = PR_IntervalNow();
// We can't have more than int32_max sockets in use
int32_t i, count;
//
// poll loop
//
// walk active list backwards to see if any sockets should actually be
// idle, then walk the idle list backwards to see if any idle sockets
// should become active. take care to check only idle sockets that
// were idle to begin with ;-)
//
count = mIdleList.Length();
for (i = mActiveList.Length() - 1; i >= 0; --i) {
//---
SOCKET_LOG((" active [%u] { handler=%p condition=%" PRIx32
" pollflags=%hu }\n",
i, mActiveList[i].mHandler.get(),
static_cast<uint32_t>(mActiveList[i].mHandler->mCondition),
mActiveList[i].mHandler->mPollFlags));
//---
if (NS_FAILED(mActiveList[i].mHandler->mCondition)) {
DetachSocket(mActiveList, &mActiveList[i]);
} else {
uint16_t in_flags = mActiveList[i].mHandler->mPollFlags;
if (in_flags == 0) {
MoveToIdleList(&mActiveList[i]);
} else {
// update poll flags
mPollList[i + 1].in_flags = in_flags;
mPollList[i + 1].out_flags = 0;
mActiveList[i].EnsureTimeout(now);
}
}
}
for (i = count - 1; i >= 0; --i) {
//---
SOCKET_LOG((" idle [%u] { handler=%p condition=%" PRIx32
" pollflags=%hu }\n",
i, mIdleList[i].mHandler.get(),
static_cast<uint32_t>(mIdleList[i].mHandler->mCondition),
mIdleList[i].mHandler->mPollFlags));
//---
if (NS_FAILED(mIdleList[i].mHandler->mCondition)) {
DetachSocket(mIdleList, &mIdleList[i]);
} else if (mIdleList[i].mHandler->mPollFlags != 0) {
MoveToPollList(&mIdleList[i]);
}
}
{
MutexAutoLock lock(mLock);
if (mPollableEvent) {
// we want to make sure the timeout is measured from the time
// we enter poll(). This method resets the timestamp to 'now',
// if we were first signalled between leaving poll() and here.
// If we didn't do this and processing events took longer than
// the allowed signal timeout, we would detect it as a
// false-positive. AdjustFirstSignalTimestamp is then a no-op
// until mPollableEvent->Clear() is called.
mPollableEvent->AdjustFirstSignalTimestamp();
}
}
SOCKET_LOG((" calling PR_Poll [active=%zu idle=%zu]\n", mActiveList.Length(),
mIdleList.Length()));
// Measures seconds spent while blocked on PR_Poll
int32_t n = 0;
*pollDuration = nullptr;
if (!gIOService->IsNetTearingDown()) {
// Let's not do polling during shutdown.
#if defined(XP_WIN)
StartPolling();
#endif
n = Poll(pollDuration, now);
#if defined(XP_WIN)
EndPolling();
#endif
}
now = PR_IntervalNow();
#ifdef MOZ_GECKO_PROFILER
TimeStamp startTime;
bool profiling = profiler_thread_is_being_profiled_for_markers();
if (profiling) {
startTime = TimeStamp::Now();
}
#endif
if (n < 0) {
SOCKET_LOG((" PR_Poll error [%d] os error [%d]\n", PR_GetError(),
PR_GetOSError()));
} else {
//
// service "active" sockets...
//
for (i = 0; i < int32_t(mActiveList.Length()); ++i) {
PRPollDesc& desc = mPollList[i + 1];
SocketContext& s = mActiveList[i];
if (n > 0 && desc.out_flags != 0) {
s.DisengageTimeout();
s.mHandler->OnSocketReady(desc.fd, desc.out_flags);
} else if (s.IsTimedOut(now)) {
SOCKET_LOG(("socket %p timed out", s.mHandler.get()));
s.DisengageTimeout();
s.mHandler->OnSocketReady(desc.fd, -1);
} else {
s.MaybeResetEpoch();
}
}
//
// check for "dead" sockets and remove them (need to do this in
// reverse order obviously).
//
for (i = mActiveList.Length() - 1; i >= 0; --i) {
if (NS_FAILED(mActiveList[i].mHandler->mCondition)) {
DetachSocket(mActiveList, &mActiveList[i]);
}
}
{
MutexAutoLock lock(mLock);
// acknowledge pollable event (should not block)
if (n != 0 &&
(mPollList[0].out_flags & (PR_POLL_READ | PR_POLL_EXCEPT)) &&
mPollableEvent &&
((mPollList[0].out_flags & PR_POLL_EXCEPT) ||
!mPollableEvent->Clear())) {
// On Windows, the TCP loopback connection in the
// pollable event may become broken when a laptop
// switches between wired and wireless networks or
// wakes up from hibernation. We try to create a
// new pollable event. If that fails, we fall back
// on "busy wait".
TryRepairPollableEvent();
}
if (mPollableEvent &&
!mPollableEvent->IsSignallingAlive(mPollableEventTimeout)) {
SOCKET_LOG(("Pollable event signalling failed/timed out"));
TryRepairPollableEvent();
}
}
}
#ifdef MOZ_GECKO_PROFILER
if (profiling) {
TimeStamp endTime = TimeStamp::Now();
if ((endTime - startTime).ToMilliseconds() >= SOCKET_THREAD_LONGTASK_MS) {
struct LongTaskMarker {
static constexpr Span<const char> MarkerTypeName() {
return MakeStringSpan("SocketThreadLongTask");
}
static void StreamJSONMarkerData(
baseprofiler::SpliceableJSONWriter& aWriter) {
aWriter.StringProperty("category", "LongTask");
}
static MarkerSchema MarkerTypeDisplay() {
using MS = MarkerSchema;
MS schema{MS::Location::MarkerChart, MS::Location::MarkerTable};
schema.AddKeyLabelFormatSearchable("category", "Type",
MS::Format::String,
MS::Searchable::Searchable);
return schema;
}
};
profiler_add_marker(ProfilerString8View("LongTaskSocketProcessing"),
geckoprofiler::category::OTHER,
MarkerTiming::Interval(startTime, endTime),
LongTaskMarker{});
}
}
#endif
return NS_OK;
}
void nsSocketTransportService::UpdateSendBufferPref() {
int32_t bufferSize;
// If the pref is set, honor it. 0 means use OS defaults.
nsresult rv = Preferences::GetInt(SEND_BUFFER_PREF, &bufferSize);
if (NS_SUCCEEDED(rv)) {
mSendBufferSize = bufferSize;
return;
}
#if defined(XP_WIN)
mSendBufferSize = 131072 * 4;
#endif
}
nsresult nsSocketTransportService::UpdatePrefs() {
mSendBufferSize = 0;
UpdateSendBufferPref();
// Default TCP Keepalive Values.
int32_t keepaliveIdleTimeS;
nsresult rv =
Preferences::GetInt(KEEPALIVE_IDLE_TIME_PREF, &keepaliveIdleTimeS);
if (NS_SUCCEEDED(rv)) {
mKeepaliveIdleTimeS = std::clamp(keepaliveIdleTimeS, 1, kMaxTCPKeepIdle);
}
int32_t keepaliveRetryIntervalS;
rv = Preferences::GetInt(KEEPALIVE_RETRY_INTERVAL_PREF,
&keepaliveRetryIntervalS);
if (NS_SUCCEEDED(rv)) {
mKeepaliveRetryIntervalS =
std::clamp(keepaliveRetryIntervalS, 1, kMaxTCPKeepIntvl);
}
int32_t keepaliveProbeCount;
rv = Preferences::GetInt(KEEPALIVE_PROBE_COUNT_PREF, &keepaliveProbeCount);
if (NS_SUCCEEDED(rv)) {
mKeepaliveProbeCount = std::clamp(keepaliveProbeCount, 1, kMaxTCPKeepCount);
}
bool keepaliveEnabled = false;
rv = Preferences::GetBool(KEEPALIVE_ENABLED_PREF, &keepaliveEnabled);
if (NS_SUCCEEDED(rv) && keepaliveEnabled != mKeepaliveEnabledPref) {
mKeepaliveEnabledPref = keepaliveEnabled;
OnKeepaliveEnabledPrefChange();
}
int32_t maxTimePref;
rv = Preferences::GetInt(MAX_TIME_BETWEEN_TWO_POLLS, &maxTimePref);
if (NS_SUCCEEDED(rv) && maxTimePref >= 0) {
mMaxTimePerPollIter = maxTimePref;
}
int32_t pollBusyWaitPeriod;
rv = Preferences::GetInt(POLL_BUSY_WAIT_PERIOD, &pollBusyWaitPeriod);
if (NS_SUCCEEDED(rv) && pollBusyWaitPeriod > 0) {
mNetworkLinkChangeBusyWaitPeriod = PR_SecondsToInterval(pollBusyWaitPeriod);
}
int32_t pollBusyWaitPeriodTimeout;
rv = Preferences::GetInt(POLL_BUSY_WAIT_PERIOD_TIMEOUT,
&pollBusyWaitPeriodTimeout);
if (NS_SUCCEEDED(rv) && pollBusyWaitPeriodTimeout > 0) {
mNetworkLinkChangeBusyWaitTimeout =
PR_SecondsToInterval(pollBusyWaitPeriodTimeout);
}
int32_t maxTimeForPrClosePref;
rv = Preferences::GetInt(MAX_TIME_FOR_PR_CLOSE_DURING_SHUTDOWN,
&maxTimeForPrClosePref);
if (NS_SUCCEEDED(rv) && maxTimeForPrClosePref >= 0) {
mMaxTimeForPrClosePref = PR_MillisecondsToInterval(maxTimeForPrClosePref);
}
int32_t pollableEventTimeout;
rv = Preferences::GetInt(POLLABLE_EVENT_TIMEOUT, &pollableEventTimeout);
if (NS_SUCCEEDED(rv) && pollableEventTimeout >= 0) {
MutexAutoLock lock(mLock);
mPollableEventTimeout = TimeDuration::FromSeconds(pollableEventTimeout);
}
nsAutoCString portMappingPref;
rv = Preferences::GetCString("network.socket.forcePort", portMappingPref);
if (NS_SUCCEEDED(rv)) {
bool rv = UpdatePortRemapPreference(portMappingPref);
if (!rv) {
NS_ERROR(
"network.socket.forcePort preference is ill-formed, this will likely "
"make everything unexpectedly fail!");
}
}
return NS_OK;
}
void nsSocketTransportService::OnKeepaliveEnabledPrefChange() {
// Dispatch to socket thread if we're not executing there.
if (!OnSocketThread()) {
gSocketTransportService->Dispatch(
NewRunnableMethod(
"net::nsSocketTransportService::OnKeepaliveEnabledPrefChange", this,
&nsSocketTransportService::OnKeepaliveEnabledPrefChange),
NS_DISPATCH_NORMAL);
return;
}
SOCKET_LOG(("nsSocketTransportService::OnKeepaliveEnabledPrefChange %s",
mKeepaliveEnabledPref ? "enabled" : "disabled"));
// Notify each socket that keepalive has been en/disabled globally.
for (int32_t i = mActiveList.Length() - 1; i >= 0; --i) {
NotifyKeepaliveEnabledPrefChange(&mActiveList[i]);
}
for (int32_t i = mIdleList.Length() - 1; i >= 0; --i) {
NotifyKeepaliveEnabledPrefChange(&mIdleList[i]);
}
}
void nsSocketTransportService::NotifyKeepaliveEnabledPrefChange(
SocketContext* sock) {
MOZ_ASSERT(sock, "SocketContext cannot be null!");
MOZ_ASSERT(sock->mHandler, "SocketContext does not have a handler!");
if (!sock || !sock->mHandler) {
return;
}
sock->mHandler->OnKeepaliveEnabledPrefChange(mKeepaliveEnabledPref);
}
NS_IMETHODIMP
nsSocketTransportService::GetName(nsACString& aName) {
aName.AssignLiteral("nsSocketTransportService");
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::Observe(nsISupports* subject, const char* topic,
const char16_t* data) {
SOCKET_LOG(("nsSocketTransportService::Observe topic=%s", topic));
if (!strcmp(topic, "last-pb-context-exited")) {
nsCOMPtr<nsIRunnable> ev = NewRunnableMethod(
"net::nsSocketTransportService::ClosePrivateConnections", this,
&nsSocketTransportService::ClosePrivateConnections);
nsresult rv = Dispatch(ev, nsIEventTarget::DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!strcmp(topic, NS_TIMER_CALLBACK_TOPIC)) {
nsCOMPtr<nsITimer> timer = do_QueryInterface(subject);
if (timer == mAfterWakeUpTimer) {
mAfterWakeUpTimer = nullptr;
mSleepPhase = false;
}
#if defined(XP_WIN)
if (timer == mPollRepairTimer) {
DoPollRepair();
}
#endif
} else if (!strcmp(topic, NS_WIDGET_SLEEP_OBSERVER_TOPIC)) {
mSleepPhase = true;
if (mAfterWakeUpTimer) {
mAfterWakeUpTimer->Cancel();
mAfterWakeUpTimer = nullptr;
}
} else if (!strcmp(topic, NS_WIDGET_WAKE_OBSERVER_TOPIC)) {
if (mSleepPhase && !mAfterWakeUpTimer) {
NS_NewTimerWithObserver(getter_AddRefs(mAfterWakeUpTimer), this, 2000,
nsITimer::TYPE_ONE_SHOT);
}
} else if (!strcmp(topic, "xpcom-shutdown-threads")) {
ShutdownThread();
} else if (!strcmp(topic, NS_NETWORK_LINK_TOPIC)) {
mLastNetworkLinkChangeTime = PR_IntervalNow();
}
return NS_OK;
}
void nsSocketTransportService::ClosePrivateConnections() {
MOZ_ASSERT(IsOnCurrentThread(), "Must be called on the socket thread");
for (int32_t i = mActiveList.Length() - 1; i >= 0; --i) {
if (mActiveList[i].mHandler->mIsPrivate) {
DetachSocket(mActiveList, &mActiveList[i]);
}
}
for (int32_t i = mIdleList.Length() - 1; i >= 0; --i) {
if (mIdleList[i].mHandler->mIsPrivate) {
DetachSocket(mIdleList, &mIdleList[i]);
}
}
}
NS_IMETHODIMP
nsSocketTransportService::GetSendBufferSize(int32_t* value) {
*value = mSendBufferSize;
return NS_OK;
}
/// ugly OS specific includes are placed at the bottom of the src for clarity
#if defined(XP_WIN)
# include <windows.h>
#elif defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
# include <sys/resource.h>
#endif
PRStatus nsSocketTransportService::DiscoverMaxCount() {
gMaxCount = SOCKET_LIMIT_MIN;
#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
// On unix and os x network sockets and file
// descriptors are the same. OS X comes defaulted at 256,
// most linux at 1000. We can reliably use [sg]rlimit to
// query that and raise it if needed.
struct rlimit rlimitData {};
if (getrlimit(RLIMIT_NOFILE, &rlimitData) == -1) { // rlimit broken - use min
return PR_SUCCESS;
}
if (rlimitData.rlim_cur >= SOCKET_LIMIT_TARGET) { // larger than target!
gMaxCount = SOCKET_LIMIT_TARGET;
return PR_SUCCESS;
}
int32_t maxallowed = rlimitData.rlim_max;
if ((uint32_t)maxallowed <= SOCKET_LIMIT_MIN) {
return PR_SUCCESS; // so small treat as if rlimit is broken
}
if ((maxallowed == -1) || // no hard cap - ok to set target
((uint32_t)maxallowed >= SOCKET_LIMIT_TARGET)) {
maxallowed = SOCKET_LIMIT_TARGET;
}
rlimitData.rlim_cur = maxallowed;
setrlimit(RLIMIT_NOFILE, &rlimitData);
if ((getrlimit(RLIMIT_NOFILE, &rlimitData) != -1) &&
(rlimitData.rlim_cur > SOCKET_LIMIT_MIN)) {
gMaxCount = rlimitData.rlim_cur;
}
#elif defined(XP_WIN) && !defined(WIN_CE)
// >= XP is confirmed to have at least 1000
static_assert(SOCKET_LIMIT_TARGET <= 1000,
"SOCKET_LIMIT_TARGET max value is 1000");
gMaxCount = SOCKET_LIMIT_TARGET;
#else
// other platforms are harder to test - so leave at safe legacy value
#endif
return PR_SUCCESS;
}
// Used to return connection info to Dashboard.cpp
void nsSocketTransportService::AnalyzeConnection(nsTArray<SocketInfo>* data,
SocketContext* context,
bool aActive) {
if (context->mHandler->mIsPrivate) {
return;
}
PRFileDesc* aFD = context->mFD;
PRFileDesc* idLayer = PR_GetIdentitiesLayer(aFD, PR_NSPR_IO_LAYER);
NS_ENSURE_TRUE_VOID(idLayer);
PRDescType type = PR_GetDescType(idLayer);
char host[64] = {0};
uint16_t port;
const char* type_desc;
if (type == PR_DESC_SOCKET_TCP) {
type_desc = "TCP";
PRNetAddr peer_addr;
PodZero(&peer_addr);
PRStatus rv = PR_GetPeerName(aFD, &peer_addr);
if (rv != PR_SUCCESS) {
return;
}
rv = PR_NetAddrToString(&peer_addr, host, sizeof(host));
if (rv != PR_SUCCESS) {
return;
}
if (peer_addr.raw.family == PR_AF_INET) {
port = peer_addr.inet.port;
} else {
port = peer_addr.ipv6.port;
}
port = PR_ntohs(port);
} else {
if (type == PR_DESC_SOCKET_UDP) {
type_desc = "UDP";
} else {
type_desc = "other";
}
NetAddr addr;
if (context->mHandler->GetRemoteAddr(&addr) != NS_OK) {
return;
}
if (!addr.ToStringBuffer(host, sizeof(host))) {
return;
}
if (addr.GetPort(&port) != NS_OK) {
return;
}
}
uint64_t sent = context->mHandler->ByteCountSent();
uint64_t received = context->mHandler->ByteCountReceived();
SocketInfo info = {nsCString(host), sent, received, port, aActive,
nsCString(type_desc)};
data->AppendElement(info);
}
void nsSocketTransportService::GetSocketConnections(
nsTArray<SocketInfo>* data) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
for (uint32_t i = 0; i < mActiveList.Length(); i++) {
AnalyzeConnection(data, &mActiveList[i], true);
}
for (uint32_t i = 0; i < mIdleList.Length(); i++) {
AnalyzeConnection(data, &mIdleList[i], false);
}
}
bool nsSocketTransportService::IsTelemetryEnabledAndNotSleepPhase() {
return Telemetry::CanRecordPrereleaseData() && !mSleepPhase;
}
#if defined(XP_WIN)
void nsSocketTransportService::StartPollWatchdog() {
// Start off the timer from a runnable off of the main thread in order to
// avoid a deadlock, see bug 1370448.
RefPtr<nsSocketTransportService> self(this);
NS_DispatchToMainThread(NS_NewRunnableFunction(
"nsSocketTransportService::StartPollWatchdog", [self] {
MutexAutoLock lock(self->mLock);
// Poll can hang sometimes. If we are in shutdown, we are going to start
// a watchdog. If we do not exit poll within REPAIR_POLLABLE_EVENT_TIME
// signal a pollable event again.
if (gIOService->IsNetTearingDown() && self->mPolling &&
!self->mPollRepairTimer) {
NS_NewTimerWithObserver(getter_AddRefs(self->mPollRepairTimer), self,
REPAIR_POLLABLE_EVENT_TIME,
nsITimer::TYPE_REPEATING_SLACK);
}
}));
}
void nsSocketTransportService::DoPollRepair() {
MutexAutoLock lock(mLock);
if (mPolling && mPollableEvent) {
mPollableEvent->Signal();
} else if (mPollRepairTimer) {
mPollRepairTimer->Cancel();
}
}
void nsSocketTransportService::StartPolling() {
MutexAutoLock lock(mLock);
mPolling = true;
}
void nsSocketTransportService::EndPolling() {
MutexAutoLock lock(mLock);
mPolling = false;
if (mPollRepairTimer) {
mPollRepairTimer->Cancel();
}
}
#endif
void nsSocketTransportService::TryRepairPollableEvent() MOZ_REQUIRES(mLock) {
mLock.AssertCurrentThreadOwns();
PollableEvent* pollable = nullptr;
{
// Bug 1719046: In certain cases PollableEvent constructor can hang
// when callign PR_NewTCPSocketPair.
// We unlock the mutex to prevent main thread hangs acquiring the lock.
MutexAutoUnlock unlock(mLock);
pollable = new PollableEvent();
}
NS_WARNING("Trying to repair mPollableEvent");
mPollableEvent.reset(pollable);
if (!mPollableEvent->Valid()) {
mPollableEvent = nullptr;
}
SOCKET_LOG(
("running socket transport thread without "
"a pollable event now valid=%d",
!!mPollableEvent));
mPollList[0].fd = mPollableEvent ? mPollableEvent->PollableFD() : nullptr;
mPollList[0].in_flags = PR_POLL_READ | PR_POLL_EXCEPT;
mPollList[0].out_flags = 0;
}
NS_IMETHODIMP
nsSocketTransportService::AddShutdownObserver(
nsISTSShutdownObserver* aObserver) {
mShutdownObservers.AppendElement(aObserver);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::RemoveShutdownObserver(
nsISTSShutdownObserver* aObserver) {
mShutdownObservers.RemoveElement(aObserver);
return NS_OK;
}
} // namespace net
} // namespace mozilla
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