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tdelibs/tdecore/network/kresolver.h

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/* -*- 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 <tqvaluelist.h>
#include <tqobject.h>
#include "ksocketaddress.h"
////////////////////////
// Forward declarations
struct sockaddr;
class TQString;
class TQCString;
class TQStrList;
//////////////////
// 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 TDECORE_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 TQString& canonName = TQString::null,
const TQCString& encodedName = TQCString());
/**
* 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, TQ_UINT16 salen, int socktype,
int protocol, const TQString& canonName = TQString::null,
const TQCString& encodedName = TQCString());
/**
* 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.
*/
TQ_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 TQString::null.
*/
TQString 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 TQCString if such information is not available.
*
* Please note that this information is NOT to be presented to the user,
* unless requested.
*/
TQCString 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 TQValueList, 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 TDECORE_EXPORT KResolverResults: public TQValueList<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.
*/
TQString nodeName() const;
/**
* The service name to which the resolution was performed.
*/
TQString serviceName() const;
/**
* Sets the new nodename and service name
*/
void setAddress(const TQString& host, const TQString& 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 TDECORE_EXPORT KResolver: public TQObject
{
Q_OBJECT
TQ_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(TQObject * = 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 TQString& nodename, const TQString& servicename = TQString::null,
TQObject * = 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 TQString 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.
*/
TQString nodeName() const;
/**
* The service name to which the resolution was/is to be performed.
*/
TQString serviceName() const;
/**
* Sets the nodename for the resolution.
*
* Set the nodename to TQString::null to unset it.
* @param nodename The nodename to be resolved.
*/
void setNodeName(const TQString& nodename);
/**
* Sets the service name to be resolved.
*
* Set it to TQString::null to unset it.
* @param service The service to be resolved.
*/
void setServiceName(const TQString& service);
/**
* Sets both the host and the service names.
*
* Setting either value to TQString::null will unset them.
* @param node The nodename
* @param service The service name
*/
void setAddress(const TQString& node, const TQString& 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 TQObject.
*
* 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(TQEvent*);
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
* TQObject::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 TQString 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 TQString& host, const TQString& 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);
* TQObject::connect(qres, TQT_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, TQT_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(TQObject* userObj, const char *userSlot,
const TQString& host, const TQString& 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
* TQCString. 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
* TQCString if failure.
*/
static TQCString domainToAscii(const TQString& 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 TQString domainToUnicode(const TQCString& asciiDomain);
/**
* The same as above, but taking a TQString argument.
*
* @param asciiDomain the ACE-encoded domain name to be decoded
* @return the Unicode representation of the given domain name
* if successful, TQString::null if not.
*/
static TQString domainToUnicode(const TQString& 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 TQString::null if the domain is
* invalid.
*/
static TQString normalizeDomain(const TQString& domain);
/**
* Resolves a protocol number to its names
*
* Note: the returned TQStrList 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 TQStrList 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 TQStrList 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 TQStrList 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 TQStrList serviceName(const char *servname, const char *protoname);
/**
* Resolves a port number to its names
*
* Note: the returned TQStrList 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 TQStrList serviceName(int port, const char *protoname);
/**
* Returns this machine's local hostname.
*
* @return this machine's local hostname
* @since 3.5
*/
static TQString 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 TQStringList *idnDomains;
};
} // namespace KNetwork
#endif