/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the QtDBus module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see http://www.qt.io/terms-conditions. For further ** information use the contact form at http://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 or version 3 as published by the Free ** Software Foundation and appearing in the file LICENSE.LGPLv21 and ** LICENSE.LGPLv3 included in the packaging of this file. Please review the ** following information to ensure the GNU Lesser General Public License ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** As a special exception, The Qt Company gives you certain additional ** rights. These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qdbusmessage.h" #include #include #include "qdbus_symbols_p.h" #include "qdbusargument_p.h" #include "qdbuserror.h" #include "qdbusmessage_p.h" #include "qdbusmetatype.h" #include "qdbusconnection_p.h" #include "qdbusutil_p.h" #ifndef QT_NO_DBUS QT_BEGIN_NAMESPACE static inline const char *data(const QByteArray &arr) { return arr.isEmpty() ? 0 : arr.constData(); } QDBusMessagePrivate::QDBusMessagePrivate() : msg(0), reply(0), type(DBUS_MESSAGE_TYPE_INVALID), timeout(-1), localReply(0), ref(1), delayedReply(false), localMessage(false), parametersValidated(false), autoStartService(true) { } QDBusMessagePrivate::~QDBusMessagePrivate() { if (msg) q_dbus_message_unref(msg); if (reply) q_dbus_message_unref(reply); delete localReply; } /*! \since 4.3 Returns the human-readable message associated with the error that was received. */ QString QDBusMessage::errorMessage() const { if (d_ptr->type == ErrorMessage) { if (!d_ptr->message.isEmpty()) return d_ptr->message; if (!d_ptr->arguments.isEmpty()) return d_ptr->arguments.at(0).toString(); } return QString(); } /*! \internal Constructs a DBusMessage object from \a message. The returned value must be de-referenced with q_dbus_message_unref. The \a capabilities flags indicates which capabilities to use. The \a error object is set to indicate the error if anything went wrong with the marshalling. Usually, this error message will be placed in the reply, as if the call failed. The \a error pointer must not be null. */ DBusMessage *QDBusMessagePrivate::toDBusMessage(const QDBusMessage &message, QDBusConnection::ConnectionCapabilities capabilities, QDBusError *error) { if (!qdbus_loadLibDBus()) { *error = QDBusError(QDBusError::Failed, QLatin1String("Could not open lidbus-1 library")); return 0; } DBusMessage *msg = 0; const QDBusMessagePrivate *d_ptr = message.d_ptr; switch (d_ptr->type) { case DBUS_MESSAGE_TYPE_INVALID: //qDebug() << "QDBusMessagePrivate::toDBusMessage" << "message is invalid"; break; case DBUS_MESSAGE_TYPE_METHOD_CALL: // only service and interface can be empty -> path and name must not be empty if (!d_ptr->parametersValidated) { if (!QDBusUtil::checkBusName(d_ptr->service, QDBusUtil::EmptyAllowed, error)) return 0; if (!QDBusUtil::checkObjectPath(d_ptr->path, QDBusUtil::EmptyNotAllowed, error)) return 0; if (!QDBusUtil::checkInterfaceName(d_ptr->interface, QDBusUtil::EmptyAllowed, error)) return 0; if (!QDBusUtil::checkMemberName(d_ptr->name, QDBusUtil::EmptyNotAllowed, error, "method")) return 0; } msg = q_dbus_message_new_method_call(data(d_ptr->service.toUtf8()), d_ptr->path.toUtf8(), data(d_ptr->interface.toUtf8()), d_ptr->name.toUtf8()); q_dbus_message_set_auto_start( msg, d_ptr->autoStartService ); break; case DBUS_MESSAGE_TYPE_METHOD_RETURN: msg = q_dbus_message_new(DBUS_MESSAGE_TYPE_METHOD_RETURN); if (!d_ptr->localMessage) { q_dbus_message_set_destination(msg, q_dbus_message_get_sender(d_ptr->reply)); q_dbus_message_set_reply_serial(msg, q_dbus_message_get_serial(d_ptr->reply)); } break; case DBUS_MESSAGE_TYPE_ERROR: // error name can't be empty if (!d_ptr->parametersValidated && !QDBusUtil::checkErrorName(d_ptr->name, QDBusUtil::EmptyNotAllowed, error)) return 0; msg = q_dbus_message_new(DBUS_MESSAGE_TYPE_ERROR); q_dbus_message_set_error_name(msg, d_ptr->name.toUtf8()); if (!d_ptr->localMessage) { q_dbus_message_set_destination(msg, q_dbus_message_get_sender(d_ptr->reply)); q_dbus_message_set_reply_serial(msg, q_dbus_message_get_serial(d_ptr->reply)); } break; case DBUS_MESSAGE_TYPE_SIGNAL: // nothing can be empty here if (!d_ptr->parametersValidated) { if (!QDBusUtil::checkObjectPath(d_ptr->path, QDBusUtil::EmptyNotAllowed, error)) return 0; if (!QDBusUtil::checkInterfaceName(d_ptr->interface, QDBusUtil::EmptyAllowed, error)) return 0; if (!QDBusUtil::checkMemberName(d_ptr->name, QDBusUtil::EmptyNotAllowed, error, "method")) return 0; } msg = q_dbus_message_new_signal(d_ptr->path.toUtf8(), d_ptr->interface.toUtf8(), d_ptr->name.toUtf8()); break; default: Q_ASSERT(false); break; } // if we got here, the parameters validated // and since the message parameters cannot be changed once the message is created // we can record this fact d_ptr->parametersValidated = true; QDBusMarshaller marshaller(capabilities); QVariantList::ConstIterator it = d_ptr->arguments.constBegin(); QVariantList::ConstIterator cend = d_ptr->arguments.constEnd(); q_dbus_message_iter_init_append(msg, &marshaller.iterator); if (!d_ptr->message.isEmpty()) // prepend the error message marshaller.append(d_ptr->message); for ( ; it != cend; ++it) marshaller.appendVariantInternal(*it); // check if everything is ok if (marshaller.ok) return msg; // not ok; q_dbus_message_unref(msg); *error = QDBusError(QDBusError::Failed, QLatin1String("Marshalling failed: ") + marshaller.errorString); return 0; } /* struct DBusMessage { DBusAtomic refcount; DBusHeader header; DBusString body; char byte_order; unsigned int locked : 1; DBUS_DISABLE_CHECKS unsigned int in_cache : 1; #endif DBusList *size_counters; long size_counter_delta; dbus_uint32_t changed_stamp : CHANGED_STAMP_BITS; DBusDataSlotList slot_list; #ifndef DBUS_DISABLE_CHECKS int generation; #endif }; */ /*! \internal Constructs a QDBusMessage by parsing the given DBusMessage object. */ QDBusMessage QDBusMessagePrivate::fromDBusMessage(DBusMessage *dmsg, QDBusConnection::ConnectionCapabilities capabilities) { QDBusMessage message; if (!dmsg) return message; message.d_ptr->type = q_dbus_message_get_type(dmsg); message.d_ptr->path = QString::fromUtf8(q_dbus_message_get_path(dmsg)); message.d_ptr->interface = QString::fromUtf8(q_dbus_message_get_interface(dmsg)); message.d_ptr->name = message.d_ptr->type == DBUS_MESSAGE_TYPE_ERROR ? QString::fromUtf8(q_dbus_message_get_error_name(dmsg)) : QString::fromUtf8(q_dbus_message_get_member(dmsg)); message.d_ptr->service = QString::fromUtf8(q_dbus_message_get_sender(dmsg)); message.d_ptr->signature = QString::fromUtf8(q_dbus_message_get_signature(dmsg)); message.d_ptr->msg = q_dbus_message_ref(dmsg); QDBusDemarshaller demarshaller(capabilities); demarshaller.message = q_dbus_message_ref(dmsg); if (q_dbus_message_iter_init(demarshaller.message, &demarshaller.iterator)) while (!demarshaller.atEnd()) message << demarshaller.toVariantInternal(); return message; } bool QDBusMessagePrivate::isLocal(const QDBusMessage &message) { return message.d_ptr->localMessage; } QDBusMessage QDBusMessagePrivate::makeLocal(const QDBusConnectionPrivate &conn, const QDBusMessage &asSent) { // simulate the message being sent to the bus and then received back // the only field that the bus sets when delivering the message // (as opposed to the message as we send it), is the sender // so we simply set the sender to our unique name // determine if we are carrying any complex types QString computedSignature; QVariantList::ConstIterator it = asSent.d_ptr->arguments.constBegin(); QVariantList::ConstIterator end = asSent.d_ptr->arguments.constEnd(); for ( ; it != end; ++it) { int id = it->userType(); const char *signature = QDBusMetaType::typeToSignature(id); if ((id != QVariant::StringList && id != QVariant::ByteArray && qstrlen(signature) != 1) || id == qMetaTypeId()) { // yes, we are // we must marshall and demarshall again so as to create QDBusArgument // entries for the complex types QDBusError error; DBusMessage *message = toDBusMessage(asSent, conn.capabilities, &error); if (!message) { // failed to marshall, so it's a call error return QDBusMessage::createError(error); } q_dbus_message_set_sender(message, conn.baseService.toUtf8()); QDBusMessage retval = fromDBusMessage(message, conn.capabilities); retval.d_ptr->localMessage = true; q_dbus_message_unref(message); if (retval.d_ptr->service.isEmpty()) retval.d_ptr->service = conn.baseService; return retval; } else { computedSignature += QLatin1String(signature); } } // no complex types seen // optimize by using the variant list itself QDBusMessage retval; QDBusMessagePrivate *d = retval.d_ptr; d->arguments = asSent.d_ptr->arguments; d->path = asSent.d_ptr->path; d->interface = asSent.d_ptr->interface; d->name = asSent.d_ptr->name; d->message = asSent.d_ptr->message; d->type = asSent.d_ptr->type; d->service = conn.baseService; d->signature = computedSignature; d->localMessage = true; return retval; } QDBusMessage QDBusMessagePrivate::makeLocalReply(const QDBusConnectionPrivate &conn, const QDBusMessage &callMsg) { // simulate the reply (return or error) message being sent to the bus and // then received back. if (callMsg.d_ptr->localReply) return makeLocal(conn, *callMsg.d_ptr->localReply); return QDBusMessage(); // failed } /*! \class QDBusMessage \inmodule QtDBus \since 4.2 \brief The QDBusMessage class represents one message sent or received over the D-Bus bus. This object can represent any of the four different types of messages (MessageType) that can occur on the bus: \list \o Method calls \o Method return values \o Signal emissions \o Error codes \endlist Objects of this type are created with the static createError(), createMethodCall() and createSignal() functions. Use the QDBusConnection::send() function to send the messages. */ /*! \enum QDBusMessage::MessageType The possible message types: \value MethodCallMessage a message representing an outgoing or incoming method call \value SignalMessage a message representing an outgoing or incoming signal emission \value ReplyMessage a message representing the return values of a method call \value ErrorMessage a message representing an error condition in response to a method call \value InvalidMessage an invalid message: this is never set on messages received from D-Bus */ /*! Constructs a new DBus message with the given \a path, \a interface and \a name, representing a signal emission. A DBus signal is emitted from one application and is received by all applications that are listening for that signal from that interface. The QDBusMessage object that is returned can be sent using the QDBusConnection::send() function. */ QDBusMessage QDBusMessage::createSignal(const QString &path, const QString &interface, const QString &name) { QDBusMessage message; message.d_ptr->type = DBUS_MESSAGE_TYPE_SIGNAL; message.d_ptr->path = path; message.d_ptr->interface = interface; message.d_ptr->name = name; return message; } /*! Constructs a new DBus message representing a method call. A method call always informs its destination address (\a service, \a path, \a interface and \a method). The DBus bus allows calling a method on a given remote object without specifying the destination interface, if the method name is unique. However, if two interfaces on the remote object export the same method name, the result is undefined (one of the two may be called or an error may be returned). When using DBus in a peer-to-peer context (i.e., not on a bus), the \a service parameter is optional. The QDBusObject and QDBusInterface classes provide a simpler abstraction to synchronous method calling. This function returns a QDBusMessage object that can be sent with QDBusConnection::call(). */ QDBusMessage QDBusMessage::createMethodCall(const QString &service, const QString &path, const QString &interface, const QString &method) { QDBusMessage message; message.d_ptr->type = DBUS_MESSAGE_TYPE_METHOD_CALL; message.d_ptr->service = service; message.d_ptr->path = path; message.d_ptr->interface = interface; message.d_ptr->name = method; return message; } /*! Constructs a new DBus message representing an error, with the given \a name and \a msg. */ QDBusMessage QDBusMessage::createError(const QString &name, const QString &msg) { QDBusMessage error; error.d_ptr->type = DBUS_MESSAGE_TYPE_ERROR; error.d_ptr->name = name; error.d_ptr->message = msg; return error; } /*! \fn QDBusMessage QDBusMessage::createError(const QDBusError &error) Constructs a new DBus message representing the given \a error. */ /*! \fn QDBusMessage QDBusMessage::createError(QDBusError::ErrorType type, const QString &msg) Constructs a new DBus message for the error type \a type using the message \a msg. Returns the DBus message. */ /*! \fn QDBusMessage QDBusMessage::createReply(const QList &arguments) const Constructs a new DBus message representing a reply, with the given \a arguments. */ QDBusMessage QDBusMessage::createReply(const QVariantList &arguments) const { QDBusMessage reply; reply.setArguments(arguments); reply.d_ptr->type = DBUS_MESSAGE_TYPE_METHOD_RETURN; if (d_ptr->msg) reply.d_ptr->reply = q_dbus_message_ref(d_ptr->msg); if (d_ptr->localMessage) { reply.d_ptr->localMessage = true; d_ptr->localReply = new QDBusMessage(reply); // keep an internal copy } // the reply must have a msg or be a local-loop optimization Q_ASSERT(reply.d_ptr->reply || reply.d_ptr->localMessage); return reply; } /*! Constructs a new DBus message representing an error reply message, with the given \a name and \a msg. */ QDBusMessage QDBusMessage::createErrorReply(const QString name, const QString &msg) const { QDBusMessage reply = QDBusMessage::createError(name, msg); if (d_ptr->msg) reply.d_ptr->reply = q_dbus_message_ref(d_ptr->msg); if (d_ptr->localMessage) { reply.d_ptr->localMessage = true; d_ptr->localReply = new QDBusMessage(reply); // keep an internal copy } // the reply must have a msg or be a local-loop optimization Q_ASSERT(reply.d_ptr->reply || reply.d_ptr->localMessage); return reply; } /*! \fn QDBusMessage QDBusMessage::createReply(const QVariant &argument) const Constructs a new DBus message representing a reply, with the given \a argument. */ /*! \fn QDBusMessage QDBusMessage::createErrorReply(const QDBusError &error) const Constructs a new DBus message representing an error reply message, from the given \a error object. */ /*! \fn QDBusMessage QDBusMessage::createErrorReply(QDBusError::ErrorType type, const QString &msg) const Constructs a new DBus reply message for the error type \a type using the message \a msg. Returns the DBus message. */ QDBusMessage QDBusMessage::createErrorReply(QDBusError::ErrorType atype, const QString &amsg) const { QDBusMessage msg = createErrorReply(QDBusError::errorString(atype), amsg); msg.d_ptr->parametersValidated = true; return msg; } /*! Constructs an empty, invalid QDBusMessage object. \sa createError(), createMethodCall(), createSignal() */ QDBusMessage::QDBusMessage() { d_ptr = new QDBusMessagePrivate; } /*! Constructs a copy of the object given by \a other. Note: QDBusMessage objects are shared. Modifications made to the copy will affect the original one as well. See setDelayedReply() for more information. */ QDBusMessage::QDBusMessage(const QDBusMessage &other) { d_ptr = other.d_ptr; d_ptr->ref.ref(); } /*! Disposes of the object and frees any resources that were being held. */ QDBusMessage::~QDBusMessage() { if (!d_ptr->ref.deref()) delete d_ptr; } /*! Copies the contents of the object given by \a other. Note: QDBusMessage objects are shared. Modifications made to the copy will affect the original one as well. See setDelayedReply() for more information. */ QDBusMessage &QDBusMessage::operator=(const QDBusMessage &other) { qAtomicAssign(d_ptr, other.d_ptr); return *this; } /*! Returns the name of the service or the bus address of the remote method call. */ QString QDBusMessage::service() const { return d_ptr->service; } /*! Returns the path of the object that this message is being sent to (in the case of a method call) or being received from (for a signal). */ QString QDBusMessage::path() const { return d_ptr->path; } /*! Returns the interface of the method being called (in the case of a method call) or of the signal being received from. */ QString QDBusMessage::interface() const { return d_ptr->interface; } /*! Returns the name of the signal that was emitted or the name of the method that was called. */ QString QDBusMessage::member() const { if (d_ptr->type != ErrorMessage) return d_ptr->name; return QString(); } /*! Returns the name of the error that was received. */ QString QDBusMessage::errorName() const { if (d_ptr->type == ErrorMessage) return d_ptr->name; return QString(); } /*! Returns the signature of the signal that was received or for the output arguments of a method call. */ QString QDBusMessage::signature() const { return d_ptr->signature; } /*! Returns the flag that indicates if this message should see a reply or not. This is only meaningful for \l {MethodCallMessage}{method call messages}: any other kind of message cannot have replies and this function will always return false for them. */ bool QDBusMessage::isReplyRequired() const { if (!d_ptr->msg) return d_ptr->localMessage; // if it's a local message, reply is required return !q_dbus_message_get_no_reply(d_ptr->msg); } /*! Sets whether the message will be replied later (if \a enable is true) or if an automatic reply should be generated by QtDBus (if \a enable is false). In D-Bus, all method calls must generate a reply to the caller, unless the caller explicitly indicates otherwise (see isReplyRequired()). QtDBus automatically generates such replies for any slots being called, but it also allows slots to indicate whether they will take responsibility of sending the reply at a later time, after the function has finished processing. \sa {Delayed Replies} */ void QDBusMessage::setDelayedReply(bool enable) const { d_ptr->delayedReply = enable; } /*! Returns the delayed reply flag, as set by setDelayedReply(). By default, this flag is false, which means QtDBus will generate automatic replies when necessary. */ bool QDBusMessage::isDelayedReply() const { return d_ptr->delayedReply; } /*! Sets the auto start flag to \a enable. This flag only makes sense for method call messages, where it tells the D-Bus server to either auto start the service responsible for the service name, or not to auto start it. By default this flag is true, i.e. a service is autostarted. This means: When the service that this method call is sent to is already running, the method call is sent to it. If the service is not running yet, the D-Bus daemon is requested to autostart the service that is assigned to this service name. This is handled by .service files that are placed in a directory known to the D-Bus server. These files then each contain a service name and the path to a program that should be executed when this service name is requested. \since 4.7 */ void QDBusMessage::setAutoStartService(bool enable) { d_ptr->autoStartService = enable; } /*! Returns the auto start flag, as set by setAutoStartService(). By default, this flag is true, which means QtDBus will auto start a service, if it is not running already. \sa setAutoStartService() \since 4.7 */ bool QDBusMessage::autoStartService() const { return d_ptr->autoStartService; } /*! Sets the arguments that are going to be sent over D-Bus to \a arguments. Those will be the arguments to a method call or the parameters in the signal. \sa arguments() */ void QDBusMessage::setArguments(const QList &arguments) { // FIXME: should we detach? d_ptr->arguments = arguments; } /*! Returns the list of arguments that are going to be sent or were received from D-Bus. */ QList QDBusMessage::arguments() const { return d_ptr->arguments; } /*! Appends the argument \a arg to the list of arguments to be sent over D-Bus in a method call or signal emission. */ QDBusMessage &QDBusMessage::operator<<(const QVariant &arg) { // FIXME: should we detach? d_ptr->arguments.append(arg); return *this; } /*! Returns the message type. */ QDBusMessage::MessageType QDBusMessage::type() const { switch (d_ptr->type) { case DBUS_MESSAGE_TYPE_METHOD_CALL: return MethodCallMessage; case DBUS_MESSAGE_TYPE_METHOD_RETURN: return ReplyMessage; case DBUS_MESSAGE_TYPE_ERROR: return ErrorMessage; case DBUS_MESSAGE_TYPE_SIGNAL: return SignalMessage; default: break; } return InvalidMessage; } /*! Sends the message without waiting for a reply. This is suitable for errors, signals, and return values as well as calls whose return values are not necessary. Returns true if the message was queued successfully; otherwise returns false. \sa QDBusConnection::send() */ #ifndef QT_NO_DEBUG_STREAM static QDebug operator<<(QDebug dbg, QDBusMessage::MessageType t) { switch (t) { case QDBusMessage::MethodCallMessage: return dbg << "MethodCall"; case QDBusMessage::ReplyMessage: return dbg << "MethodReturn"; case QDBusMessage::SignalMessage: return dbg << "Signal"; case QDBusMessage::ErrorMessage: return dbg << "Error"; default: return dbg << "Invalid"; } } static void debugVariantList(QDebug dbg, const QVariantList &list) { bool first = true; QVariantList::ConstIterator it = list.constBegin(); QVariantList::ConstIterator end = list.constEnd(); for ( ; it != end; ++it) { if (!first) dbg.nospace() << ", "; dbg.nospace() << qPrintable(QDBusUtil::argumentToString(*it)); first = false; } } QDebug operator<<(QDebug dbg, const QDBusMessage &msg) { dbg.nospace() << "QDBusMessage(type=" << msg.type() << ", service=" << msg.service(); if (msg.type() == QDBusMessage::MethodCallMessage || msg.type() == QDBusMessage::SignalMessage) dbg.nospace() << ", path=" << msg.path() << ", interface=" << msg.interface() << ", member=" << msg.member(); if (msg.type() == QDBusMessage::ErrorMessage) dbg.nospace() << ", error name=" << msg.errorName() << ", error message=" << msg.errorMessage(); dbg.nospace() << ", signature=" << msg.signature() << ", contents=("; debugVariantList(dbg, msg.arguments()); dbg.nospace() << ") )"; return dbg.space(); } #endif QT_END_NAMESPACE #endif // QT_NO_DBUS