src/dbus/qdbusinternalfilters.cpp

   1 /****************************************************************************
   2 **
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  41
  42 #include "qdbusconnection_p.h"
  43
  44 #include "qdbus_symbols_p.h"
  45 #include <QtCore/qcoreapplication.h>
  46 #include <QtCore/qmetaobject.h>
  47 #include <QtCore/qstringlist.h>
  48 #include <QtCore/qthread.h>
  49
  50 #include "qdbusabstractadaptor.h"
  51 #include "qdbusabstractadaptor_p.h"
  52 #include "qdbusconnection.h"
  53 #include "qdbusextratypes.h"
  54 #include "qdbusmessage.h"
  55 #include "qdbusmetatype.h"
  56 #include "qdbusmetatype_p.h"
  57 #include "qdbusmessage_p.h"
  58 #include "qdbusutil_p.h"
  59 #include "qdbusvirtualobject.h"
  60
  61 #ifndef QT_NO_DBUS
  62
  63 QT_BEGIN_NAMESPACE
  64
  65 // defined in qdbusxmlgenerator.cpp
  66 extern QString qDBusGenerateMetaObjectXml(QString interface, const QMetaObject *mo,
  67                                           const QMetaObject *base, int flags);
  68
  69 static const char introspectableInterfaceXml[] =
  70     "  <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
  71     "    <method name=\"Introspect\">\n"
  72     "      <arg name=\"xml_data\" type=\"s\" direction=\"out\"/>\n"
  73     "    </method>\n"
  74     "  </interface>\n";
  75
  76 static const char propertiesInterfaceXml[] =
  77     "  <interface name=\"org.freedesktop.DBus.Properties\">\n"
  78     "    <method name=\"Get\">\n"
  79     "      <arg name=\"interface_name\" type=\"s\" direction=\"in\"/>\n"
  80     "      <arg name=\"property_name\" type=\"s\" direction=\"in\"/>\n"
  81     "      <arg name=\"value\" type=\"v\" direction=\"out\"/>\n"
  82     "    </method>\n"
  83     "    <method name=\"Set\">\n"
  84     "      <arg name=\"interface_name\" type=\"s\" direction=\"in\"/>\n"
  85     "      <arg name=\"property_name\" type=\"s\" direction=\"in\"/>\n"
  86     "      <arg name=\"value\" type=\"v\" direction=\"in\"/>\n"
  87     "    </method>\n"
  88     "    <method name=\"GetAll\">\n"
  89     "      <arg name=\"interface_name\" type=\"s\" direction=\"in\"/>\n"
  90     "      <arg name=\"values\" type=\"a{sv}\" direction=\"out\"/>\n"
  91     "      <annotation name=\"org.qtproject.QtDBus.QtTypeName.Out0\" value=\"QVariantMap\"/>\n"
  92     "    </method>\n"
  93     "  </interface>\n";
  94
  95 static QString generateSubObjectXml(QObject *object)
  96 {
  97     QString retval;
  98     const QObjectList &objs = object->children();
  99     QObjectList::ConstIterator it = objs.constBegin();
 100     QObjectList::ConstIterator end = objs.constEnd();
 101     for ( ; it != end; ++it) {
 102         QString name = (*it)->objectName();
 103         if (!name.isEmpty() && QDBusUtil::isValidPartOfObjectPath(name))
 104             retval += QString::fromLatin1("  <node name=\"%1\"/>\n")
 105                       .arg(name);
 106     }
 107     return retval;
 108 }
 109
 110 // declared as extern in qdbusconnection_p.h
 111
 112 QString qDBusIntrospectObject(const QDBusConnectionPrivate::ObjectTreeNode &node, const QString &path)
 113 {
 114     // object may be null
 115
 116     QString xml_data(QLatin1String(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE));
 117     xml_data += QLatin1String("<node>\n");
 118
 119     if (node.obj) {
 120         Q_ASSERT_X(QThread::currentThread() == node.obj->thread(),
 121                    "QDBusConnection: internal threading error",
 122                    "function called for an object that is in another thread!!");
 123
 124         if (node.flags & (QDBusConnection::ExportScriptableContents
 125                            | QDBusConnection::ExportNonScriptableContents)) {
 126             // create XML for the object itself
 127             const QMetaObject *mo = node.obj->metaObject();
 128             for ( ; mo != &QObject::staticMetaObject; mo = mo->superClass())
 129                 xml_data += qDBusGenerateMetaObjectXml(QString(), mo, mo->superClass(),
 130                                                        node.flags);
 131         }
 132
 133         // does this object have adaptors?
 134         QDBusAdaptorConnector *connector;
 135         if (node.flags & QDBusConnection::ExportAdaptors &&
 136             (connector = qDBusFindAdaptorConnector(node.obj))) {
 137
 138             // trasverse every adaptor in this object
 139             QDBusAdaptorConnector::AdaptorMap::ConstIterator it = connector->adaptors.constBegin();
 140             QDBusAdaptorConnector::AdaptorMap::ConstIterator end = connector->adaptors.constEnd();
 141             for ( ; it != end; ++it) {
 142                 // add the interface:
 143                 QString ifaceXml = QDBusAbstractAdaptorPrivate::retrieveIntrospectionXml(it->adaptor);
 144                 if (ifaceXml.isEmpty()) {
 145                     // add the interface's contents:
 146                     ifaceXml += qDBusGenerateMetaObjectXml(QString::fromLatin1(it->interface),
 147                                                            it->adaptor->metaObject(),
 148                                                            &QDBusAbstractAdaptor::staticMetaObject,
 149                                                            QDBusConnection::ExportScriptableContents
 150                                                            | QDBusConnection::ExportNonScriptableContents);
 151
 152                     QDBusAbstractAdaptorPrivate::saveIntrospectionXml(it->adaptor, ifaceXml);
 153                 }
 154
 155                 xml_data += ifaceXml;
 156             }
 157         }
 158
 159         // is it a virtual node that handles introspection itself?
 160         if (node.flags & QDBusConnectionPrivate::VirtualObject) {
 161             xml_data += node.treeNode->introspect(path);
 162         }
 163
 164         xml_data += QLatin1String( propertiesInterfaceXml );
 165     }
 166
 167     xml_data += QLatin1String( introspectableInterfaceXml );
 168
 169     if (node.flags & QDBusConnection::ExportChildObjects) {
 170         xml_data += generateSubObjectXml(node.obj);
 171     } else {
 172         // generate from the object tree
 173         QDBusConnectionPrivate::ObjectTreeNode::DataList::ConstIterator it =
 174             node.children.constBegin();
 175         QDBusConnectionPrivate::ObjectTreeNode::DataList::ConstIterator end =
 176             node.children.constEnd();
 177         for ( ; it != end; ++it)
 178             if (it->obj || !it->children.isEmpty())
 179                 xml_data += QString::fromLatin1("  <node name=\"%1\"/>\n")
 180                             .arg(it->name);
 181     }
 182
 183     xml_data += QLatin1String("</node>\n");
 184     return xml_data;
 185 }
 186
 187 // implement the D-Bus interface org.freedesktop.DBus.Properties
 188
 189 static inline QDBusMessage interfaceNotFoundError(const QDBusMessage &msg, const QString &interface_name)
 190 {
 191     return msg.createErrorReply(QDBusError::UnknownInterface,
 192                                 QString::fromLatin1("Interface %1 was not found in object %2")
 193                                 .arg(interface_name)
 194                                 .arg(msg.path()));
 195 }
 196
 197 static inline QDBusMessage
 198 propertyNotFoundError(const QDBusMessage &msg, const QString &interface_name, const QByteArray &property_name)
 199 {
 200     return msg.createErrorReply(QDBusError::InvalidArgs,
 201                                 QString::fromLatin1("Property %1%2%3 was not found in object %4")
 202                                 .arg(interface_name,
 203                                      QString::fromLatin1(interface_name.isEmpty() ? "" : "."),
 204                                      QString::fromLatin1(property_name),
 205                                      msg.path()));
 206 }
 207
 208 QDBusMessage qDBusPropertyGet(const QDBusConnectionPrivate::ObjectTreeNode &node,
 209                               const QDBusMessage &msg)
 210 {
 211     Q_ASSERT(msg.arguments().count() == 2);
 212     Q_ASSERT_X(!node.obj || QThread::currentThread() == node.obj->thread(),
 213                "QDBusConnection: internal threading error",
 214                "function called for an object that is in another thread!!");
 215
 216     QString interface_name = msg.arguments().at(0).toString();
 217     QByteArray property_name = msg.arguments().at(1).toString().toUtf8();
 218
 219     QDBusAdaptorConnector *connector;
 220     QVariant value;
 221     bool interfaceFound = false;
 222     if (node.flags & QDBusConnection::ExportAdaptors &&
 223         (connector = qDBusFindAdaptorConnector(node.obj))) {
 224
 225         // find the class that implements interface_name or try until we've found the property
 226         // in case of an empty interface
 227         if (interface_name.isEmpty()) {
 228             for (QDBusAdaptorConnector::AdaptorMap::ConstIterator it = connector->adaptors.constBegin(),
 229                  end = connector->adaptors.constEnd(); it != end; ++it) {
 230                 const QMetaObject *mo = it->adaptor->metaObject();
 231                 int pidx = mo->indexOfProperty(property_name);
 232                 if (pidx != -1) {
 233                     value = mo->property(pidx).read(it->adaptor);
 234                     break;
 235                 }
 236             }
 237         } else {
 238             QDBusAdaptorConnector::AdaptorMap::ConstIterator it;
 239             it = qLowerBound(connector->adaptors.constBegin(), connector->adaptors.constEnd(),
 240                              interface_name);
 241             if (it != connector->adaptors.constEnd() && interface_name == QLatin1String(it->interface)) {
 242                 interfaceFound = true;
 243                 value = it->adaptor->property(property_name);
 244             }
 245         }
 246     }
 247
 248     if (!interfaceFound && !value.isValid()
 249         && node.flags & (QDBusConnection::ExportAllProperties |
 250                          QDBusConnection::ExportNonScriptableProperties)) {
 251         // try the object itself
 252         if (!interface_name.isEmpty())
 253             interfaceFound = qDBusInterfaceInObject(node.obj, interface_name);
 254
 255         if (interfaceFound) {
 256             int pidx = node.obj->metaObject()->indexOfProperty(property_name);
 257             if (pidx != -1) {
 258                 QMetaProperty mp = node.obj->metaObject()->property(pidx);
 259                 if ((mp.isScriptable() && (node.flags & QDBusConnection::ExportScriptableProperties)) ||
 260                     (!mp.isScriptable() && (node.flags & QDBusConnection::ExportNonScriptableProperties)))
 261                     value = mp.read(node.obj);
 262             }
 263         }
 264     }
 265
 266     if (!value.isValid()) {
 267         // the property was not found
 268         if (!interfaceFound)
 269             return interfaceNotFoundError(msg, interface_name);
 270         return propertyNotFoundError(msg, interface_name, property_name);
 271     }
 272
 273     return msg.createReply(QVariant::fromValue(QDBusVariant(value)));
 274 }
 275
 276 enum PropertyWriteResult {
 277     PropertyWriteSuccess = 0,
 278     PropertyNotFound,
 279     PropertyTypeMismatch,
 280     PropertyWriteFailed
 281 };
 282
 283 static QDBusMessage propertyWriteReply(const QDBusMessage &msg, const QString &interface_name,
 284                                        const QByteArray &property_name, int status)
 285 {
 286     switch (status) {
 287     case PropertyNotFound:
 288         return propertyNotFoundError(msg, interface_name, property_name);
 289     case PropertyTypeMismatch:
 290         return msg.createErrorReply(QDBusError::InvalidArgs,
 291                                     QString::fromLatin1("Invalid arguments for writing to property %1%2%3")
 292                                     .arg(interface_name,
 293                                          QString::fromLatin1(interface_name.isEmpty() ? "" : "."),
 294                                          QString::fromLatin1(property_name)));
 295     case PropertyWriteFailed:
 296         return msg.createErrorReply(QDBusError::InternalError,
 297                                     QString::fromLatin1("Internal error"));
 298
 299     case PropertyWriteSuccess:
 300         return msg.createReply();
 301     }
 302     Q_ASSERT_X(false, "", "Should not be reached");
 303     return QDBusMessage();
 304 }
 305
 306 static int writeProperty(QObject *obj, const QByteArray &property_name, QVariant value,
 307                          int propFlags = QDBusConnection::ExportAllProperties)
 308 {
 309     const QMetaObject *mo = obj->metaObject();
 310     int pidx = mo->indexOfProperty(property_name);
 311     if (pidx == -1) {
 312         // this object has no property by that name
 313         return PropertyNotFound;
 314     }
 315
 316     QMetaProperty mp = mo->property(pidx);
 317
 318     // check if this property is exported
 319     bool isScriptable = mp.isScriptable();
 320     if (!(propFlags & QDBusConnection::ExportScriptableProperties) && isScriptable)
 321         return PropertyNotFound;
 322     if (!(propFlags & QDBusConnection::ExportNonScriptableProperties) && !isScriptable)
 323         return PropertyNotFound;
 324
 325     // we found our property
 326     // do we have the right type?
 327     int id = mp.userType();
 328     if (!id){
 329         // type not registered or invalid / void?
 330         qWarning("QDBusConnection: Unable to handle unregistered datatype '%s' for property '%s::%s'",
 331                  mp.typeName(), mo->className(), property_name.constData());
 332         return PropertyWriteFailed;
 333     }
 334
 335     if (id != QMetaType::QVariant && value.userType() == QDBusMetaTypeId::argument) {
 336         // we have to demarshall before writing
 337         void *null = 0;
 338         QVariant other(id, null);
 339         if (!QDBusMetaType::demarshall(qvariant_cast<QDBusArgument>(value), id, other.data())) {
 340             qWarning("QDBusConnection: type `%s' (%d) is not registered with QtDBus. "
 341                      "Use qDBusRegisterMetaType to register it",
 342                      mp.typeName(), id);
 343             return PropertyWriteFailed;
 344         }
 345
 346         value = other;
 347     }
 348
 349     // the property type here should match
 350     return mp.write(obj, value) ? PropertyWriteSuccess : PropertyWriteFailed;
 351 }
 352
 353 QDBusMessage qDBusPropertySet(const QDBusConnectionPrivate::ObjectTreeNode &node,
 354                               const QDBusMessage &msg)
 355 {
 356     Q_ASSERT(msg.arguments().count() == 3);
 357     Q_ASSERT_X(!node.obj || QThread::currentThread() == node.obj->thread(),
 358                "QDBusConnection: internal threading error",
 359                "function called for an object that is in another thread!!");
 360
 361     QString interface_name = msg.arguments().at(0).toString();
 362     QByteArray property_name = msg.arguments().at(1).toString().toUtf8();
 363     QVariant value = qvariant_cast<QDBusVariant>(msg.arguments().at(2)).variant();
 364
 365     QDBusAdaptorConnector *connector;
 366     if (node.flags & QDBusConnection::ExportAdaptors &&
 367         (connector = qDBusFindAdaptorConnector(node.obj))) {
 368
 369         // find the class that implements interface_name or try until we've found the property
 370         // in case of an empty interface
 371         if (interface_name.isEmpty()) {
 372             for (QDBusAdaptorConnector::AdaptorMap::ConstIterator it = connector->adaptors.constBegin(),
 373                  end = connector->adaptors.constEnd(); it != end; ++it) {
 374                 int status = writeProperty(it->adaptor, property_name, value);
 375                 if (status == PropertyNotFound)
 376                     continue;
 377                 return propertyWriteReply(msg, interface_name, property_name, status);
 378             }
 379         } else {
 380             QDBusAdaptorConnector::AdaptorMap::ConstIterator it;
 381             it = qLowerBound(connector->adaptors.constBegin(), connector->adaptors.constEnd(),
 382                              interface_name);
 383             if (it != connector->adaptors.end() && interface_name == QLatin1String(it->interface)) {
 384                 return propertyWriteReply(msg, interface_name, property_name,
 385                                           writeProperty(it->adaptor, property_name, value));
 386             }
 387         }
 388     }
 389
 390     if (node.flags & (QDBusConnection::ExportScriptableProperties |
 391                       QDBusConnection::ExportNonScriptableProperties)) {
 392         // try the object itself
 393         bool interfaceFound = true;
 394         if (!interface_name.isEmpty())
 395             interfaceFound = qDBusInterfaceInObject(node.obj, interface_name);
 396
 397         if (interfaceFound) {
 398             return propertyWriteReply(msg, interface_name, property_name,
 399                                       writeProperty(node.obj, property_name, value, node.flags));
 400         }
 401     }
 402
 403     // the property was not found
 404     if (!interface_name.isEmpty())
 405         return interfaceNotFoundError(msg, interface_name);
 406     return propertyWriteReply(msg, interface_name, property_name, PropertyNotFound);
 407 }
 408
 409 // unite two QVariantMaps, but don't generate duplicate keys
 410 static QVariantMap &operator+=(QVariantMap &lhs, const QVariantMap &rhs)
 411 {
 412     QVariantMap::ConstIterator it = rhs.constBegin(),
 413                               end = rhs.constEnd();
 414     for ( ; it != end; ++it)
 415         lhs.insert(it.key(), it.value());
 416     return lhs;
 417 }
 418
 419 static QVariantMap readAllProperties(QObject *object, int flags)
 420 {
 421     QVariantMap result;
 422     const QMetaObject *mo = object->metaObject();
 423
 424     // QObject has properties, so don't start from 0
 425     for (int i = QObject::staticMetaObject.propertyCount(); i < mo->propertyCount(); ++i) {
 426         QMetaProperty mp = mo->property(i);
 427
 428         // is it readable?
 429         if (!mp.isReadable())
 430             continue;
 431
 432         // is it a registered property?
 433         int typeId = mp.userType();
 434         if (!typeId)
 435             continue;
 436         const char *signature = QDBusMetaType::typeToSignature(typeId);
 437         if (!signature)
 438             continue;
 439
 440         // is this property visible from the outside?
 441         if ((mp.isScriptable() && flags & QDBusConnection::ExportScriptableProperties) ||
 442             (!mp.isScriptable() && flags & QDBusConnection::ExportNonScriptableProperties)) {
 443             // yes, it's visible
 444             QVariant value = mp.read(object);
 445             if (value.isValid())
 446                 result.insert(QString::fromLatin1(mp.name()), value);
 447         }
 448     }
 449
 450     return result;
 451 }
 452
 453 QDBusMessage qDBusPropertyGetAll(const QDBusConnectionPrivate::ObjectTreeNode &node,
 454                                  const QDBusMessage &msg)
 455 {
 456     Q_ASSERT(msg.arguments().count() == 1);
 457     Q_ASSERT_X(!node.obj || QThread::currentThread() == node.obj->thread(),
 458                "QDBusConnection: internal threading error",
 459                "function called for an object that is in another thread!!");
 460
 461     QString interface_name = msg.arguments().at(0).toString();
 462
 463     bool interfaceFound = false;
 464     QVariantMap result;
 465
 466     QDBusAdaptorConnector *connector;
 467     if (node.flags & QDBusConnection::ExportAdaptors &&
 468         (connector = qDBusFindAdaptorConnector(node.obj))) {
 469
 470         if (interface_name.isEmpty()) {
 471             // iterate over all interfaces
 472             for (QDBusAdaptorConnector::AdaptorMap::ConstIterator it = connector->adaptors.constBegin(),
 473                  end = connector->adaptors.constEnd(); it != end; ++it) {
 474                 result += readAllProperties(it->adaptor, QDBusConnection::ExportAllProperties);
 475             }
 476         } else {
 477             // find the class that implements interface_name
 478             QDBusAdaptorConnector::AdaptorMap::ConstIterator it;
 479             it = qLowerBound(connector->adaptors.constBegin(), connector->adaptors.constEnd(),
 480                              interface_name);
 481             if (it != connector->adaptors.constEnd() && interface_name == QLatin1String(it->interface)) {
 482                 interfaceFound = true;
 483                 result = readAllProperties(it->adaptor, QDBusConnection::ExportAllProperties);
 484             }
 485         }
 486     }
 487
 488     if (node.flags & QDBusConnection::ExportAllProperties &&
 489         (!interfaceFound || interface_name.isEmpty())) {
 490         // try the object itself
 491         result += readAllProperties(node.obj, node.flags);
 492         interfaceFound = true;
 493     }
 494
 495     if (!interfaceFound && !interface_name.isEmpty()) {
 496         // the interface was not found
 497         return interfaceNotFoundError(msg, interface_name);
 498     }
 499
 500     return msg.createReply(QVariant::fromValue(result));
 501 }
 502
 503 QT_END_NAMESPACE
 504
 505 #endif // QT_NO_DBUS