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 /*  -*- mode: C++; coding: utf-8; -*-
  *  Copyright (C) 2003,2005 Thiago Macieira <thiago@kde.org>
  *
  *
  *  Permission is hereby granted, free of charge, to any person obtaining
  *  a copy of this software and associated documentation files (the
  *  "Software"), to deal in the Software without restriction, including
  *  without limitation the rights to use, copy, modify, merge, publish,
  *  distribute, sublicense, and/or sell copies of the Software, and to
  *  permit persons to whom the Software is furnished to do so, subject to
  *  the following conditions:
  *
  *  The above copyright notice and this permission notice shall be included
  *  in all copies or substantial portions of the Software.
  *
  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
 #ifndef KRESOLVER_H
 #define KRESOLVER_H
 
 //////////////////
 // Needed includes
 #include <QList>
 #include <QObject>
 #include <QSharedDataPointer>
 #include "k3socketaddress.h"
 #include "kdemacros.h"
 
 ////////////////////////
 // Forward declarations
 struct sockaddr;
 class QString;
 class QByteArray;
 template<typename T> class QSet;
 
 //////////////////
 // Our definitions
 
 namespace KNetwork
 {
 
 namespace Internal
 {
 class KResolverManager;
 }
 
 class KResolverEntryPrivate;
 /** @class KResolverEntry k3resolver.h k3resolver.h
  *  @brief One resolution entry.
  *
  * This class is one element in the resolution results list.
  * It contains the socket address for connecting, as well as
  * a bit more of information: the socket type, address family
  * and protocol numbers.
  *
  * This class contains all the information required for creating,
  * binding and connecting a socket.
  *
  * KResolverEntry objects implicitly share data, so copying them
  * is quite efficient.
  *
  * @author Thiago Macieira <thiago@kde.org>
  * @deprecated Use KSocketFactory or KLocalSocket instead
  */
 class KDELIBS4SUPPORT_DEPRECATED_EXPORT KResolverEntry
 {
 public:
     /**
      * Default constructor
      *
      */
     KResolverEntry();
 
     /**
      * Constructs a new KResolverEntry from a KSocketAddress
      * and other data.
      *
      * The KSocketAddress @p addr parameter will be deep-copied.
      *
      * @param addr    the address that was resolved
      * @param socktype    the socket type of the resolved address
      * @param protocol    the protocol of the resolved address
      * @param canonName   the canonical name of the resolved hostname
      * @param encodedName the ASCII-compatible encoding of the hostname
      */
     KResolverEntry(const KSocketAddress &addr, int socktype, int protocol,
                    const QString &canonName = QString(),
                    const QByteArray &encodedName = QByteArray());
 
     /**
      * Constructs a new KResolverEntry from raw forms of
      * socket addresses and other data.
      *
      * This constructor instead creates an internal KSocketAddress object.
      *
      * @param sa      the sockaddr structure containing the raw address
      * @param salen   the length of the sockaddr structure
      * @param socktype    the socket type of the resolved address
      * @param protocol    the protocol of the resolved address
      * @param canonName   the canonical name of the resolved hostname
      * @param encodedName the ASCII-compatible encoding of the hostname
      */
     KResolverEntry(const struct sockaddr *sa, quint16 salen, int socktype,
                    int protocol, const QString &canonName = QString(),
                    const QByteArray &encodedName = QByteArray());
 
     /**
      * Copy constructor.
      *
      * This constructor performs a shallow-copy of the other object.
      */
     KResolverEntry(const KResolverEntry &other);
 
     /**
      * Destructor.
      *
      * The destructor frees associated resources with this object. It does
      * not destroy shared data.
      */
     ~KResolverEntry();
 
     /**
      * Retrieves the socket address associated with this entry.
      */
     KSocketAddress address() const;
 
     /**
      * Retrieves the length of the socket address structure.
      */
     quint16 length() const;
 
     /**
      * Retrieves the family associated with this socket address.
      */
     int family() const;
 
     /**
      * Retrieves the canonical name associated with this entry, if there is any.
      * If the canonical name was not found, this function returns QString().
      */
     QString canonicalName() const;
 
     /**
      * Retrieves the encoded domain name associated with this entry, if there is
      * any. If this domain has been resolved through DNS, this will be the
      * the ACE-encoded hostname.
      *
      * Returns a null QByteArray if such information is not available.
      *
      * Please note that this information is NOT to be presented to the user,
      * unless requested.
      */
     QByteArray encodedName() const;
 
     /**
      * Retrieves the socket type associated with this entry.
      */
     int socketType() const;
 
     /**
      * Retrieves the protocol associated with this entry.
      */
     int protocol() const;
 
     /**
      * Assignment operator
      *
      * This function copies the contents of the other object into this one.
      * Data will be shared between the two of them.
      */
     KResolverEntry &operator=(const KResolverEntry &other);
 
     /**
      * Dummy operator== for compilers which need a complete
      * instantiated class when exporting to a shared lib
      */
     KDE_DUMMY_COMPARISON_OPERATOR(KResolverEntry)
 
 private:
     QSharedDataPointer<KResolverEntryPrivate> d;
 };
 
 KDE_DUMMY_QHASH_FUNCTION(KResolverEntry)
 
 class KResolverResultsPrivate;
 /**
  * @class KResolverResults k3resolver.h k3resolver.h
  * @brief Name and service resolution results.
  *
  * This object contains the results of a name and service resolution, as
  * those performed by KResolver. It is also a descendant of QValueList, so
  * you may use all its member functions here to access the elements.
  *
  * A KResolverResults object is associated with a resolution, so, in addition
  * to the resolved elements, you can also retrieve information about the
  * resolution process itself, like the nodename that was resolved or an error
  * code.
  *
  * Note Resolver also uses KResolverResults objects to indicate failure, so
  * you should test for failure.
  *
  * @author Thiago Macieira <thiago@kde.org>
  * @deprecated Use KSocketFactory or KLocalSocket instead
  */
 class KDELIBS4SUPPORT_DEPRECATED_EXPORT KResolverResults: public QList<KResolverEntry>
 {
 public:
     /**
      * Default constructor.
      *
      * Constructs an empty list.
      */
     KResolverResults();
 
     /**
      * Copy constructor
      *
      * Creates a new object with the contents of the other one. Data will be
      * shared by the two objects, like QValueList
      */
     KResolverResults(const KResolverResults &other);
 
     /**
      * Destructor
      *
      * Destroys the object and frees associated resources.
      */
     virtual ~KResolverResults();
 
     /**
      * Assignment operator
      *
      * Copies the contents of the other container into this one, discarding
      * our current values.
      */
     KResolverResults &operator=(const KResolverResults &other);
 
     /**
      * Retrieves the error code associated with this resolution. The values
      * here are the same as in KResolver::ErrorCodes.
      */
     int error() const;
 
     /**
      * Retrieves the system error code, if any.
      * @see KResolver::systemError for more information
      */
     int systemError() const;
 
     /**
      * Sets the error codes
      *
      * @param errorcode       the error code in KResolver::ErrorCodes
      * @param systemerror the system error code associated, if any
      */
     void setError(int errorcode, int systemerror = 0);
 
     /**
      * The nodename to which the resolution was performed.
      */
     QString nodeName() const;
 
     /**
      * The service name to which the resolution was performed.
      */
     QString serviceName() const;
 
     /**
      * Sets the new nodename and service name
      */
     void setAddress(const QString &host, const QString &service);
 
 protected:
     /** Standard hack to add virtuals later. @internal */
     virtual void virtual_hook(int id, void *data);
 private:
     QSharedDataPointer<KResolverResultsPrivate> d;
 };
 
 class KResolverPrivate;
 /**
  * @class KResolver k3resolver.h k3resolver.h
  * @brief Name and service resolution class.
  *
  * This class provides support for doing name-to-binary resolution
  * for nodenames and service ports. You should use this class if you
  * need specific resolution techniques when creating a socket or if you
  * want to inspect the results before calling the socket functions.
  *
  * You can either create an object and set the options you want in it
  * or you can simply call the static member functions, which will create
  * standard Resolver objects and dispatch the resolution for you. Normally,
  * the static functions will be used, except in cases where specific options
  * must be set.
  *
  * A Resolver object defaults to the following:
  * @li address family: any address family
  * @li socket type: streaming socket
  * @li protocol: implementation-defined. Generally, TCP
  * @li host and service: unset
  *
  * @author Thiago Macieira <thiago@kde.org>
  * @deprecated Use KSocketFactory or KLocalSocket instead
  */
 class KDELIBS4SUPPORT_DEPRECATED_EXPORT KResolver: public QObject
 {
     Q_OBJECT
 
 public:
 
     /**
      * Address family selection types
      *
      * These values can be OR-ed together to form a composite family selection.
      *
      * @li UnknownFamily: a family that is unknown to the current implementation
      * @li KnownFamily: a family that is known to the implementation (the exact
      *        opposite of UnknownFamily)
      * @li AnyFamilies: any address family is acceptable
      * @li InternetFamily: an address for connecting to the Internet
      * @li InetFamily: alias for InternetFamily
      * @li IPv6Family: an IPv6 address only
      * @li IPv4Family: an IPv4 address only
      * @li UnixFamily: an address for the local Unix namespace (i.e., Unix sockets)
      * @li LocalFamily: alias for UnixFamily
      */
     enum SocketFamilies {
         UnknownFamily = 0x0001,
 
         UnixFamily = 0x0002,
         LocalFamily = UnixFamily,
 
         IPv4Family = 0x0004,
         IPv6Family = 0x0008,
         InternetFamily = IPv4Family | IPv6Family,
         InetFamily = InternetFamily,
 
         KnownFamily = ~UnknownFamily,
         AnyFamily = KnownFamily | UnknownFamily
     };
 
     /**
      * Flags for the resolution.
      *
      * These flags are used for setting the resolution behaviour for this
      * object:
      * @li Passive: resolve to a passive socket (i.e., one that can be used for
      *        binding to a local interface)
      * @li CanonName: request that the canonical name for the given nodename
      *        be found and recorded
      * @li NoResolve: request that no external resolution be performed. The given
      *        nodename and servicename will be resolved locally only.
      * @li NoSrv: don't try to use SRV-based name-resolution.
      * @li Multiport: the port/service argument is a list of port numbers and
      *        ranges. (future extension)
      *
      * @note SRV-based lookup and Multiport are not implemented yet.
      */
     enum Flags {
         Passive = 0x01,
         CanonName = 0x02,
         NoResolve = 0x04,
         NoSrv = 0x08,
         Multiport = 0x10
     };
 
     /**
      * Error codes
      *
      * These are the possible error values that objects of this class
      * may return. See errorString() for getting a string representation
      * for these errors.
      *
      * @li AddrFamily: Address family for the given nodename is not supported.
      * @li TryAgain: Temporary failure in name resolution. You should try again.
      * @li NonRecoverable: Non-recoverable failure in name resolution.
      * @li BadFlags: Invalid flags were given.
      * @li Memory: Memory allocation failure.
      * @li NoName: The specified name or service doesn't exist.
      * @li UnsupportedFamily: The requested socket family is not supported.
      * @li UnsupportedService: The requested service is not supported for this
      *        socket type (i.e., a datagram service in a streaming socket).
      * @li UnsupportedSocketType: The requested socket type is not supported.
      * @li UnknownError: An unknown, unexpected error occurred.
      * @li SystemError: A system error occurred. See systemError().
      * @li Canceled: This request was canceled by the user.
      */
     enum ErrorCodes {
         // note: if you change this enum, take a look at KResolver::errorString
         NoError = 0,
         AddrFamily = -1,
         TryAgain = -2,
         NonRecoverable = -3,
         BadFlags = -4,
         Memory = -5,
         NoName = -6,
         UnsupportedFamily = -7,
         UnsupportedService = -8,
         UnsupportedSocketType = -9,
         UnknownError = -10,
         SystemError = -11,
         Canceled = -100
     };
 
     /**
      * Status codes.
      *
      * These are the possible status for a Resolver object. A value
      * greater than zero indicates normal behaviour, while negative
      * values either indicate failure or error.
      *
      * @li Idle: resolution has not yet been started.
      * @li Queued: resolution is queued but not yet in progress.
      * @li InProgress: resolution is in progress.
      * @li PostProcessing: resolution is in progress.
      * @li Success: resolution is done; you can retrieve the results.
      * @li Canceled: request canceled by the user.
      * @li Failed: resolution is done, but failed.
      *
      * Note: the status Canceled and the error code Canceled are the same.
      *
      * Note 2: the status Queued and InProgress might not be distinguishable.
      * Some implementations might not differentiate one from the other.
      */
     enum StatusCodes {
         Idle = 0,
         Queued = 1,
         InProgress = 5,
         PostProcessing = 6,
         Success = 10,
         //Canceled = -100,    // already defined above
         Failed = -101
     };
 
     /**
      * Default constructor.
      *
      * Creates an empty Resolver object. You should set the wanted
      * names and flags using the member functions before starting
      * the name resolution.
      *
      * @param parent the parent object (see QObject)
      */
     KResolver(QObject *parent = nullptr);
 
     /**
      * Constructor with host and service names.
      *
      * Creates a Resolver object with the given host and
      * service names. Flags are initialised to 0 and any address family
      * will be accepted.
      *
      * @param nodename    the host name we want resolved
      * @param servicename the service name associated, like "http"
      * @param parent      the parent object (see QObject)
      */
     KDELIBS4SUPPORT_DEPRECATED explicit KResolver(const QString &nodename, const QString &servicename = QString(),
                        QObject *parent = nullptr);
 
     /**
      * Destructor.
      *
      * When this object is deleted, it'll destroy all associated
      * resources. If the resolution is still in progress, it will be
      * canceled and the signal will \b not be emitted.
      */
     ~KResolver() override;
 
     /**
      * Retrieve the current status of this object.
      *
      * @see StatusCodes for the possible status codes.
      */
     int status() const;
 
     /**
      * Retrieve the error code in this object.
      *
      * This function will return NoError if we are not in
      * an error condition. See status() and StatusCodes to
      * find out what the current status is.
      *
      * @see errorString for getting a textual representation of
      * this error
      */
     int error() const;
 
     /**
      * Retrieve the associated system error code in this object.
      *
      * Many resolution operations may generate an extra error code
      * as given by the C errno variable. That value is stored in the
      * object and can be retrieved by this function.
      */
     int systemError() const;
 
     /**
      * Returns the textual representation of the error in this object.
      */
     QString errorString() const;
 
     /**
      * Returns true if this object is currently running
      */
     bool isRunning() const;
 
     /**
      * The nodename to which the resolution was/is to be performed.
      */
     QString nodeName() const;
 
     /**
      * The service name to which the resolution was/is to be performed.
      */
     QString serviceName() const;
 
     /**
      * Sets the nodename for the resolution.
      *
      * Set the nodename to QString() to unset it.
      * @param nodename        The nodename to be resolved.
      */
     void setNodeName(const QString &nodename);
 
     /**
      * Sets the service name to be resolved.
      *
      * Set it to QString() to unset it.
      * @param service     The service to be resolved.
      */
     void setServiceName(const QString &service);
 
     /**
      * Sets both the host and the service names.
      *
      * Setting either value to QString() will unset them.
      * @param node        The nodename
      * @param service     The service name
      */
     void setAddress(const QString &node, const QString &service);
 
     /**
      * Retrieves the flags set for the resolution.
      *
      * @see Flags for an explanation on what flags are possible
      */
     int flags() const;
 
     /**
      * Sets the flags.
      *
      * @param flags       the new flags
      * @return            the old flags
      * @see Flags for an explanation on the flags
      */
     int setFlags(int flags);
 
     /**
      * Sets the allowed socket families.
      *
      * @param families        the families that we want/accept
      * @see SocketFamilies for possible values
      */
     void setFamily(int families);
 
     /**
      * Sets the socket type we want.
      *
      * The values for the @p type parameter are the SOCK_*
      * constants, defined in <sys/socket.h>. The most common
      * values are:
      *  @li SOCK_STREAM       streaming socket (= reliable, sequenced,
      *                connection-based)
      *  @li SOCK_DGRAM        datagram socket (= unreliable, connectionless)
      *  @li SOCK_RAW      raw socket, with direct access to the
      *                container protocol (such as IP)
      *
      * These three are the only values to which it is guaranteed that
      * resolution will work. Some systems may define other constants (such as
      * SOCK_RDM for reliable datagrams), but support is implementation-defined.
      *
      * @param type        the wanted socket type (SOCK_* constants). Set
      *                0 to use the default.
      */
     void setSocketType(int type);
 
     /**
      * Sets the protocol we want.
      *
      * Protocols are dependent on the selected address family, so you should know
      * what you are doing if you use this function. Besides, protocols generally
      * are either stream-based or datagram-based, so the value of the socket
      * type is also important. The resolution will fail if these values don't match.
      *
      * When using an Internet socket, the values for the protocol are the
      * IPPROTO_* constants, defined in <netinet/in.h>.
      *
      * You may choose to set the protocol either by its number or by its name, or
      * by both. If you set:
      * @li the number and the name: both values will be stored internally; you
      *        may set the name to an empty value, if wanted
      * @li the number only (name = NULL): the name will be searched in the
      *        protocols database
      * @li the name only (number = 0): the number will be searched in the
      *        database
      * @li neither name nor number: reset to default behaviour
      *
      * @param protonum        the protocol number we want
      * @param name        the protocol name
      */
     void setProtocol(int protonum, const char *name = nullptr);
 
     /**
      * Starts the name resolution asynchronously.
      *
      * This function will queue this object for resolution
      * and will return immediately. The status upon exit will either be
      * Queued or InProgress or Failed.
      *
      * This function does nothing if the object is already queued. But if
      * it had already succeeded or failed, this function will re-start it.
      *
      * Note: if both the nodename and the servicename are unset, this function
      * will not queue, but will set a success state and emit the signal. Also
      * note that in this case and maybe others, the signal finished() might
      * be emitted before this function returns.
      *
      * @return true if this request was successfully queued for asynchronous
      *        resolution
      */
     bool start();
 
     /**
      * Waits for a request to finish resolving.
      *
      * This function will wait on a running request for its termination. The
      * status upon exit will either be Success or Failed or Canceled.
      *
      * This function may be called from any thread, even one that is not the
      * GUI thread or the one that started the resolution process. But note this
      * function is not thread-safe nor reentrant: i.e., only one thread can be
      * waiting on one given object.
      *
      * Also note that this function ensures that the finished() signal is
      * emitted before it returns. That means that, as a side-effect, whenever
      * wait() is called, the signal is emitted on the thread calling wait().
      *
      * @param msec        the time to wait, in milliseconds or 0 to
      *                wait forever
      * @return true if the resolution has finished processing, even when it
      *         failed or was canceled. False means the wait timed out and
      *         the resolution is still running.
      */
     bool wait(int msec = 0);
 
     /**
      * Cancels a running request
      *
      * This function will cancel a running request. If the request is not
      * currently running or queued, this function does nothing.
      *
      * Note: if you tell the signal to be emitted, be aware that it might
      * or might not be emitted before this function returns.
      *
      * @param emitSignal  whether to emit the finished() signal or not
      */
     void cancel(bool emitSignal = true);
 
     /**
      * Retrieves the results of this resolution
      *
      * Use this function to retrieve the results of the resolution. If no
      * data was resolved (yet) or if we failed, this function will return
      * an empty object.
      *
      * @return the resolved data
      * @see status for information on finding out if the resolution was successful
      */
     KResolverResults results() const;
 
     /**
      * Handles events. Reimplemented from QObject.
      *
      * This function handles the events generated by the manager indicating that
      * this object has finished processing.
      *
      * Do not post events to this object.
      */
     bool event(QEvent *) override;
 
 Q_SIGNALS:
     // signals
 
     /**
      * This signal is emitted whenever the resolution is finished, one
      * way or another (success or failure). The @p results parameter
      * will contain the resolved data.
      *
      * Note: if you are doing multiple resolutions, you can use the
      * QObject::sender() function to distinguish one Resolver object from
      * another.
      *
      * @param results     the resolved data; might be empty if the resolution
      *            failed
      * @see results for information on what the results are
      *
      * @note This signal is @b always delivered in the GUI event thread, even for
      *       resolutions that were started in secondary threads.
      */
     void finished(const KNetwork::KResolverResults &results);
 
 private:
     void emitFinished();
 
 public:
     // Static functions
 
     /**
      * Returns the string representation of this error code.
      *
      * @param errorcode   the error code. See ErrorCodes.
      * @param syserror    the system error code associated.
      * @return        the string representation. This is already
      *            i18n'ed.
      */
     static QString errorString(int errorcode, int syserror = 0);
 
     /**
      * Resolve the nodename and service name synchronously
      *
      * This static function is provided as convenience for simplifying
      * name resolution. It resolves the given host and service names synchronously
      * and returns the results it found. It is equivalent to the following code:
      *
      * \code
      *   KResolver qres(host, service);
      *   qres.setFlags(flags);
      *   qres.setFamily(families)
      *   qres.start();
      *   qres.wait();
      *   return qres.results();
      * \endcode
      *
      * @param host        the nodename to resolve
      * @param service     the service to resolve
      * @param flags       flags to be used
      * @param families        the families to be searched
      * @return a KResolverResults object containing the results
      * @see KResolverResults for information on how to obtain the error code
      */
     static KResolverResults resolve(const QString &host, const QString &service,
                                     int flags = 0, int families = KResolver::InternetFamily);
 
     /**
      * Start an asynchronous name resolution
      *
      * This function is provided as a convenience to simplify the resolution
      * process. It creates an internal KResolver object, connects the
      * finished() signal to the given slot and starts the resolution
      * asynchronously. It is more or less equivalent to the following code:
      *
      * \b Note: this function may trigger the signal before it returns, so
      * your code must be prepared for this situation.
      *
      * \code
      *   KResolver* qres = new KResolver(host, service);
      *   QObject::connect(qres, SIGNAL(finished(const KNetwork::KResolverResults&)),
      *                userObj, userSlot);
      *   qres->setFlags(flags);
      *   qres->setFamily(families);
      *   return qres->start();
      * \endcode
      *
      * You should use it like this in your code:
      * \code
      *   KResolver::resolveAsync(myObj, SLOT(mySlot(KResolverResults)), host, service);
      * \endcode
      *
      * @param userObj     the object whose slot @p userSlot we will connect
      * @param userSlot        the slot to which we'll connect
      * @param host        the nodename to resolve
      * @param service     the service to resolve
      * @param flags       flags to be used
      * @param families        families to be searcheed
      * @return true if the queuing was successful, false if not
      * @see KResolverResults for information on how to obtain the error code
      */
     static bool resolveAsync(QObject *userObj, const char *userSlot,
                              const QString &host, const QString &service,
                              int flags = 0, int families = KResolver::InternetFamily);
 
     /**
      * Returns the domain name in an ASCII Compatible Encoding form, suitable
      * for DNS lookups. This is the base for International Domain Name support
      * over the Internet.
      *
      * Note this function may fail, in which case it'll return a null
      * QByteArray. Reasons for failure include use of unknown code
      * points (Unicode characters).
      *
      * Note that the encoding is illegible and, thus, should not be presented
      * to the user, except if requested.
      *
      * @param unicodeDomain   the domain name to be encoded
      * @return the ACE-encoded suitable for DNS queries if successful, a null
      *         QByteArray if failure.
      */
     static QByteArray domainToAscii(const QString &unicodeDomain);
 
     /**
      * Does the inverse of domainToAscii() and return an Unicode domain
      * name from the given ACE-encoded domain.
      *
      * This function may fail if the given domain cannot be successfully
      * converted back to Unicode. Reasons for failure include a malformed
      * domain name or good ones whose reencoding back to ACE don't match
      * the form given here (e.g., ACE-encoding of an already
      * ASCII-compatible domain).
      *
      * It is, however, guaranteed that domains returned
      * by domainToAscii() will work.
      *
      * @param asciiDomain the ACE-encoded domain name to be decoded
      * @return the Unicode representation of the given domain name
      * if successful, the original string if not
      * @note ACE = ASCII-Compatible Encoding, i.e., 7-bit
      */
     static QString domainToUnicode(const QByteArray &asciiDomain);
 
     /**
      * The same as above, but taking a QString argument.
      *
      * @param asciiDomain the ACE-encoded domain name to be decoded
      * @return the Unicode representation of the given domain name
      * if successful, QString() if not.
      */
     static QString domainToUnicode(const QString &asciiDomain);
 
     /**
      * Normalise a domain name.
      *
      * In order to prevent simple mistakes in International Domain
      * Names (IDN), it has been decided that certain code points
      * (characters in Unicode) would be instead converted to others.
      * This includes turning them all to lower case, as well certain
      * other specific operations, as specified in the documents.
      *
      * For instance, the German 'ß' will be changed into 'ss', while
      * the micro symbol 'µ' will be changed to the Greek mu 'μ'.
      *
      * Two equivalent domains have the same normalised form. And the
      * normalised form of a normalised domain is itself (i.e., if
      * d is normalised, the following is true: d == normalizeDomain(d) )
      *
      * This operation is equivalent to encoding and the decoding a Unicode
      * hostname.
      *
      * @param domain      a domain to be normalised
      * @return the normalised domain, or QString() if the domain is
      * invalid.
      */
     static QString normalizeDomain(const QString &domain);
 
     /**
      * Resolves a protocol number to its names
      *
      * Note: the returned QStrList operates on deep-copies.
      *
      * @param protonum    the protocol number to be looked for
      * @return all the protocol names in a list. The first is the "proper"
      *        name.
      */
     static QList<QByteArray> protocolName(int protonum);
 
     /**
      * Finds all aliases for a given protocol name
      *
      * @param protoname   the protocol name to be looked for
      * @return all the protocol names in a list. The first is the "proper"
      *        name.
      */
     static QList<QByteArray> protocolName(const char *protoname);
 
     /**
      * Resolves a protocol name to its number
      *
      * @param protoname   the protocol name to be looked for
      * @return the protocol number or -1 if we couldn't locate it
      */
     static int protocolNumber(const char *protoname);
 
     /**
      * Resolves a service name to its port number
      *
      * @param servname        the service name to be looked for
      * @param protoname       the protocol it is associated with
      * @return the port number in host byte-order or -1 in case of error
      */
     static int servicePort(const char *servname, const char *protoname);
 
     /**
      * Finds all the aliases for a given service name
      *
      * Note: the returned QList<QByteArray> operates on deep-copies.
      *
      * @param servname        the service alias to be looked for
      * @param protoname       the protocol it is associated with
      * @return all the service names in a list. The first is the "proper"
      *        name.
      */
     static QList<QByteArray> serviceName(const char *servname, const char *protoname);
 
     /**
      * Resolves a port number to its names
      *
      * Note: the returned QList<QByteArray> operates on deep copies.
      *
      * @param port        the port number, in host byte-order
      * @param protoname       the protocol it is associated with
      * @return all the service names in a list. The first is the "proper"
      *        name.
      */
     static QList<QByteArray> serviceName(int port, const char *protoname);
 
     /**
      * Returns this machine's local hostname.
      *
      * @return this machine's local hostname
      */
     static QString localHostName();
 
 protected:
 
     /**
      * Sets the error codes
      */
     void setError(int errorcode, int systemerror = 0);
 
     /** Standard hack to add virtuals later. @internal */
     virtual void virtual_hook(int id, void *data);
 private:
     KResolverPrivate *const d;
     friend class KResolverResults;
     friend class ::KNetwork::Internal::KResolverManager;
 };
 
 }               // namespace KNetwork
 
 #endif