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/* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "LogStream.h"
#if ENABLE(LOGD_BLOCKING_IN_WEBCONTENT)
#include "LogStreamMessages.h"
#include "Logging.h"
#include "StreamConnectionWorkQueue.h"
#include "StreamServerConnection.h"
#include "WebProcessProxy.h"
#include <wtf/OSObjectPtr.h>
#include <wtf/TZoneMallocInlines.h>
#if HAVE(OS_SIGNPOST)
#include <wtf/SystemTracing.h>
#endif
#define MESSAGE_CHECK(assertion, connection) MESSAGE_CHECK_BASE(assertion, connection)
namespace WebKit {
static std::atomic<unsigned> globalLogCountForTesting { 0 };
WTF_MAKE_TZONE_ALLOCATED_IMPL(LogStream);
LogStream::LogStream(WebProcessProxy& process, Ref<ConnectionType>&& connection, LogStreamIdentifier identifier)
: m_connection(WTFMove(connection))
#if ENABLE(STREAMING_IPC_IN_LOG_FORWARDING)
, m_process(process)
#endif
, m_identifier(identifier)
, m_pid(process.processID())
{
}
LogStream::~LogStream() = default;
void LogStream::stopListeningForIPC()
{
assertIsMainRunLoop();
#if ENABLE(STREAMING_IPC_IN_LOG_FORWARDING)
m_connection->stopReceivingMessages(Messages::LogStream::messageReceiverName(), m_identifier.toUInt64());
#endif
}
void LogStream::logOnBehalfOfWebContent(std::span<const uint8_t> logSubsystem, std::span<const uint8_t> logCategory, std::span<const uint8_t> nullTerminatedLogString, uint8_t logType)
{
#if ENABLE(STREAMING_IPC_IN_LOG_FORWARDING)
ASSERT(!isMainRunLoop());
#endif
auto isNullTerminated = [](std::span<const uint8_t> view) {
return view.data() && !view.empty() && view.back() == '\0';
};
bool isValidLogType = logType == OS_LOG_TYPE_DEFAULT || logType == OS_LOG_TYPE_INFO || logType == OS_LOG_TYPE_DEBUG || logType == OS_LOG_TYPE_ERROR || logType == OS_LOG_TYPE_FAULT;
RefPtr connection = m_connection.get();
MESSAGE_CHECK(isNullTerminated(nullTerminatedLogString) && isValidLogType, connection);
MESSAGE_CHECK(logSubsystem.size() <= logSubsystemMaxSize, connection);
MESSAGE_CHECK(logCategory.size() <= logCategoryMaxSize, connection);
MESSAGE_CHECK(nullTerminatedLogString.size() <= logStringMaxSize, connection);
// os_log_hook on sender side sends a null category and subsystem when logging to OS_LOG_DEFAULT.
auto osLog = OSObjectPtr<os_log_t>();
if (isNullTerminated(logSubsystem) && isNullTerminated(logCategory)) {
auto subsystem = byteCast<char>(logSubsystem.data());
auto category = byteCast<char>(logCategory.data());
if (equalSpans("Testing\0"_span, logCategory))
globalLogCountForTesting++;
osLog = adoptOSObject(os_log_create(subsystem, category));
}
auto osLogPointer = osLog.get() ? osLog.get() : OS_LOG_DEFAULT;
#if HAVE(OS_SIGNPOST)
if (WTFSignpostHandleIndirectLog(osLogPointer, m_pid, byteCast<char>(nullTerminatedLogString)))
return;
#endif
// Use '%{public}s' in the format string for the preprocessed string from the WebContent process.
// This should not reveal any redacted information in the string, since it has already been composed in the WebContent process.
os_log_with_type(osLogPointer, static_cast<os_log_type_t>(logType), "WebContent[%d] %{public}s", m_pid, byteCast<char>(nullTerminatedLogString).data());
}
#if ENABLE(STREAMING_IPC_IN_LOG_FORWARDING)
RefPtr<LogStream> LogStream::create(WebProcessProxy& process, IPC::StreamServerConnectionHandle&& serverConnection, LogStreamIdentifier identifier, CompletionHandler<void(IPC::Semaphore& streamWakeUpSemaphore, IPC::Semaphore& streamClientWaitSemaphore)>&& completionHandler)
{
RefPtr connection = IPC::StreamServerConnection::tryCreate(WTFMove(serverConnection), { });
if (!connection)
return nullptr;
static NeverDestroyed<Ref<IPC::StreamConnectionWorkQueue>> logQueue = IPC::StreamConnectionWorkQueue::create("Log work queue"_s);
Ref instance = adoptRef(*new LogStream(process, connection.releaseNonNull(), identifier));
instance->m_connection->open(instance.get(), logQueue.get());
instance->m_connection->startReceivingMessages(instance, Messages::LogStream::messageReceiverName(), identifier.toUInt64());
completionHandler(logQueue.get()->wakeUpSemaphore(), instance->m_connection->clientWaitSemaphore());
return instance;
}
void LogStream::didReceiveInvalidMessage(IPC::StreamServerConnection&, IPC::MessageName messageName, const Vector<uint32_t>&)
{
RELEASE_LOG_FAULT(IPC, "Received an invalid message '%" PUBLIC_LOG_STRING "' from WebContent process, requesting for it to be terminated.", description(messageName).characters());
callOnMainRunLoop([weakProcess = m_process] {
if (RefPtr process = weakProcess.get())
process->terminate();
});
}
#else
Ref<LogStream> LogStream::create(WebProcessProxy& process, Ref<IPC::Connection>&& connection, LogStreamIdentifier identifier)
{
return adoptRef(*new LogStream(process, WTFMove(connection), identifier));
}
#endif
unsigned LogStream::logCountForTesting()
{
return globalLogCountForTesting;
}
#if __has_include("LogMessagesImplementations.h")
#include "LogMessagesImplementations.h"
#endif
}
#endif
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