Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 945 insertions, 0 deletions

diff --git a/kdecore/network/kresolver.h b/kdecore/network/kresolver.h
new file mode 100644
index 000000000..b4e4334be
--- /dev/null
+++ b/kdecore/network/kresolver.h
@@ -0,0 +1,945 @@
+/*  -*- mode: C++; coding: utf-8; -*-
+ *  Copyright (C) 2003,2005 Thiago Macieira <thiago.macieira@kdemail.net>
+ *
+ *
+ *  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 <qvaluelist.h>
+#include <qobject.h>
+#include "ksocketaddress.h"
+
+
+////////////////////////
+// Forward declarations
+struct sockaddr;
+class QString;
+class QCString;
+class QStrList;
+
+//////////////////
+// Our definitions
+
+namespace KNetwork {
+
+  namespace Internal { class KResolverManager; }
+
+class KResolverEntryPrivate;
+/** @class KResolverEntry kresolver.h kresolver.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.macieira@kdemail.net>
+ */
+class KDECORE_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::null,
+		const QCString& encodedName = QCString());
+
+  /**
+   * 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, Q_UINT16 salen, int socktype,
+		int protocol, const QString& canonName = QString::null,
+		const QCString& encodedName = QCString());
+
+  /**
+   * 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.
+   */
+  Q_UINT16 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::null.
+   */
+  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 QCString if such information is not available.
+   *
+   * Please note that this information is NOT to be presented to the user,
+   * unless requested.
+   */
+  QCString 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);
+
+private:
+  KResolverEntryPrivate* d;
+};
+
+class KResolverResultsPrivate;
+/**
+ * @class KResolverResults kresolver.h kresolver.h
+ * @brief Name and service resolution results.
+ *
+ * This object contains the results of a name and service resolution, as
+ * those performed by @ref 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.macieira@kdemail.net>
+ */
+class KDECORE_EXPORT KResolverResults: public QValueList<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 @ref 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 @ref 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:
+  virtual void virtual_hook( int id, void* data );
+private:
+  KResolverResultsPrivate* d;
+};
+
+class KResolverPrivate;
+/**
+ * @class KResolver kresolver.h kresolver.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.macieira@kdemail.net>
+ */
+class KDECORE_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. (deprecated)
+   * @li UseSrv: 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,
+      UseSrv = 0x20
+    };
+
+  /**
+   * Error codes
+   *
+   * These are the possible error values that objects of this class
+   * may return. See \ref 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 @ref systemError.
+   * @li Canceled: This request was cancelled 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 cancelled 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.
+   */
+  KResolver(QObject * = 0L, const char * = 0L);
+
+  /**
+   * 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".
+   */
+  KResolver(const QString& nodename, const QString& servicename = QString::null,
+	    QObject * = 0L, const char * = 0L);
+
+  /**
+   * Destructor.
+   *
+   * When this object is deleted, it'll destroy all associated
+   * resources. If the resolution is still in progress, it will be
+   * cancelled and the signal will \b not be emitted.
+   */
+  virtual ~KResolver();
+
+  /**
+   * 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 @ref status and @ref 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.
+   */
+  inline QString errorString() const
+  { return errorString(error(), systemError()); }
+
+  /**
+   * 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::null 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::null 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::null 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 dependant 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 = 0L);
+
+  /**
+   * 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 @ref 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 @ref 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 @ref 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.
+   */
+  virtual bool event(QEvent*);
+
+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(KResolverResults results);
+
+private:
+  void emitFinished();
+
+public:
+  // Static functions
+
+  /**
+   * Returns the string representation of this error code.
+   *
+   * @param errorcode	the error code. See @ref 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
+   * @ref 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(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 queueing 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 
+   * QCString. 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
+   *	     QCString if failure.
+   */
+  static QCString domainToAscii(const QString& unicodeDomain);
+
+  /**
+   * Does the inverse of @ref 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 @ref 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 QCString& 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::null 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::null 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 QStrList 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 QStrList 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 QStrList 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 QStrList serviceName(const char *servname, const char *protoname);
+
+  /**
+   * Resolves a port number to its names
+   *
+   * Note: the returned QStrList 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 QStrList serviceName(int port, const char *protoname);
+
+  /**
+   * Returns this machine's local hostname.
+   *
+   * @return this machine's local hostname
+   * @since 3.5
+   */
+  static QString localHostName();
+
+protected:
+
+  /**
+   * Sets the error codes
+   */
+  void setError(int errorcode, int systemerror = 0);
+
+  virtual void virtual_hook( int id, void* data );
+private:
+  KResolverPrivate* d;
+  friend class KResolverResults;
+  friend class ::KNetwork::Internal::KResolverManager;
+  
+  static QStringList *idnDomains;
+};
+
+}				// namespace KNetwork
+
+#endif