mDNSResponder-108.2.tar.gz

[apple/mdnsresponder.git] / mDNSWindows / DLL.NET / dnssd_NET.h

/*
 * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@

 * 
 * NOTE:
 * 
 * These .Net APIs are a work in progress, currently being discussed and refined.
 * If you plan to build an application based on these APIs, you may wish to
 * statically link this code into your application, or otherwise distribute
 * the DLL so that it installs into the same folder as your application
 * (not into any common system area where it might interfere with other
 * applications using a future completed version of these APIs).
 * If you plan to do this, please be sure to inform us by sending email
 * to bonjour@apple.com to let us know.
 * You may want to discuss what you're doing on the Bonjour mailing
 * list to see if others in similar positions have any suggestions for you:
 * 
 * <http://lists.apple.com/bonjour-dev/>
 * 

    Change History (most recent first):

$Log: dnssd_NET.h,v $
Revision 1.8  2005/02/10 22:35:33  cheshire
<rdar://problem/3727944> Update name

Revision 1.7  2004/12/16 19:56:12  cheshire
Update comments

Revision 1.6  2004/09/20 22:47:06  cheshire
Add cautionary comment

Revision 1.5  2004/09/16 18:16:27  shersche
Cleanup to parameter names
Submitted by: prepin@gmail.com

Revision 1.4  2004/09/13 19:35:57  shersche
<rdar://problem/3798941> Add Apple.DNSSD namespace to MC++ wrapper class
<rdar://problem/3798950> Change all instances of unsigned short to int
Bug #: 3798941, 3798950

Revision 1.3  2004/07/27 07:12:10  shersche
make TextRecord an instantiable class object

Revision 1.2  2004/07/19 07:48:34  shersche
fix bug in DNSService.Register when passing in NULL text record, add TextRecord APIs

Revision 1.1  2004/06/26 04:01:22  shersche
Initial revision


 */
    
#pragma once

#include <dns_sd.h>
#include <vcclr.h>
#include <memory>
#include <winsock2.h>

using namespace System;
using namespace System::Net;
using namespace System::Runtime::InteropServices;
using namespace System::Threading;
using namespace System::Collections;


namespace Apple
{
        namespace DNSSD
        {
                public __gc class ServiceRef;

                public __value enum ServiceFlags : int
                {
                        MoreComing                      =       1,
                        /* MoreComing indicates to a callback that at least one more result is
                                * queued and will be delivered following immediately after this one.
                                * Applications should not update their UI to display browse
                                * results when the MoreComing flag is set, because this would
                                * result in a great deal of ugly flickering on the screen.
                                * Applications should instead wait until until MoreComing is not set,
                                * and then update their UI.
                                * When MoreComing is not set, that doesn't mean there will be no more
                                * answers EVER, just that there are no more answers immediately
                                * available right now at this instant. If more answers become available
                                * in the future they will be delivered as usual.
                                */

                        Add                                     =       2,
                        Default                         =       4,
                        /* Flags for domain enumeration and browse/query reply callbacks.
                                * "Default" applies only to enumeration and is only valid in
                                * conjuction with "Add".  An enumeration callback with the "Add"
                                * flag NOT set indicates a "Remove", i.e. the domain is no longer
                                * valid.
                                */

                        NoAutoRename            =       8,
                        /* Flag for specifying renaming behavior on name conflict when registering
                                * non-shared records. By default, name conflicts are automatically handled
                                * by renaming the service.  NoAutoRename overrides this behavior - with this
                                * flag set, name conflicts will result in a callback.  The NoAutorename flag
                                * is only valid if a name is explicitly specified when registering a service
                                * (i.e. the default name is not used.)
                                */

                        Shared                          =       16,
                        Unique                          =       32,
                        /* Flag for registering individual records on a connected
                                * DNSServiceRef.  Shared indicates that there may be multiple records
                                * with this name on the network (e.g. PTR records).  Unique indicates that
        the
                                * record's name is to be unique on the network (e.g. SRV records).
                                */

                        BrowseDomains           =       64,
                        RegistrationDomains     =       128,
                        /* Flags for specifying domain enumeration type in DNSServiceEnumerateDomain
        s.
                                * BrowseDomains enumerates domains recommended for browsing, RegistrationDo
        mains
                                * enumerates domains recommended for registration.
                                */
                };


                public __value enum ErrorCode : int
                {
                        NoError                         =       0,
                        Unknown                         =       -65537,
                        NoSuchName                      =       -65538,
                        NoMemory                        =       -65539,
                        BadParam                        =       -65540,
                        BadReference            =       -65541,
                        BadState                        =       -65542,
                        BadFlags                        =       -65543,
                        Unsupported                     =       -65544,
                        AlreadyRegistered       =       -65547,
                        NameConflict            =       -65548,
                        Invalid                         =       -65549,
                        Incompatible            =       -65551,
                        BadinterfaceIndex       =       -65552

                        /*
                                * mDNS Error codes are in the range
                                * FFFE FF00 (-65792) to FFFE FFFF (-65537)
                                */
                };

                public __gc class DNSServiceException
                :
                        public Exception
                {
                public:

                        DNSServiceException
                                (
                                int err
                                );

                        DNSServiceException
                                (       
                                String                          *       message,
                                System::Exception       *       innerException
                                );

                        int err;
                };


                /*
                * class RecordRef
                *
                * This is a thin MC++ class facade on top of a DNSRecordRef
                */
                public __gc class RecordRef
                {
                public:

                        RecordRef()
                        {
                                m_impl = new RecordRefImpl;
                                m_impl->m_ref = NULL;
                        }

                        ~RecordRef()
                        {
                                delete m_impl;
                        }

                        __nogc class RecordRefImpl
                        {
                        public:

                                DNSRecordRef m_ref;
                        };

                        RecordRefImpl * m_impl;
                };                      


                /*
                * class ServiceRef
                *
                * This is a thin MC++ class facade on top of a DNSServiceRef
                */
                public __gc class ServiceRef : public IDisposable
                {
                public:

                        ServiceRef(Object * callback);

                        ~ServiceRef();

                        /*
                        * This does an underlying DNSServiceRefDeallocate().  After
                        * calling Dispose, the ServiceRef is no longer usable.
                        */
                        void
                        Dispose();

                        /*
                        * Internal - Dispatch an EnumerateDomains callback
                        */
                        void
                        EnumerateDomainsDispatch
                                (
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       replyDomain
                                );

                        /*
                        * Internal - Dispatch a Register callback
                        */
                        void
                        RegisterDispatch
                                (
                                ServiceFlags    flags,
                                ErrorCode               errorCode,
                                String          *       name,
                                String          *       regtype,
                                String          *       domain
                                );

                        /*
                        * Internal - Dispatch a Browse callback
                        */
                        void
                        BrowseDispatch
                                (
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       serviceName,
                                String          *       regtype,
                                String          *       replyDomain
                                );

                        /*
                        * Internal - Dispatch a Resolve callback
                        */
                        void
                        ResolveDispatch
                                (
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       fullname,
                                String          *       hosttarget,
                                int                             port,
                                Byte                    txtRecord[]
                                );
                        
                        /*
                        * Internal - Dispatch a RegisterRecord callback
                        */
                        void
                        RegisterRecordDispatch
                                (
                                ServiceFlags    flags,
                                ErrorCode               errorCode,
                                RecordRef       *       record
                                );

                        /*
                        * Internal - Dispatch a QueryRecord callback
                        */
                        void
                        QueryRecordDispatch
                                (
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       fullname,
                                int                             rrtype,
                                int                             rrclass,
                                Byte                    rdata[],
                                int                             ttl
                                );

                        /*
                        * Internal - A non managed class to wrap a DNSServiceRef
                        */
                        __nogc class ServiceRefImpl
                        {
                        public:

                                ServiceRefImpl
                                        (
                                        ServiceRef * outer
                                        );

                                ~ServiceRefImpl();

                                /*
                                * Sets up events for threaded operation
                                */
                                void
                                SetupEvents();

                                /*
                                * Main processing thread
                                */
                                void
                                ProcessingThread();

                                /*
                                * Calls DNSServiceRefDeallocate()
                                */
                                void
                                Dispose();

                                /*
                                * Called from dnssd.dll
                                */
                                static void DNSSD_API
                                EnumerateDomainsCallback
                                        (
                                        DNSServiceRef                   sdRef,
                                        DNSServiceFlags                 flags,
                                        uint32_t                                interfaceIndex,
                                        DNSServiceErrorType             errorCode,
                                        const char                      *       replyDomain,
                                        void                            *       context
                                        );

                                static void DNSSD_API
                                RegisterCallback
                                        (
                                        DNSServiceRef                   ref,
                                        DNSServiceFlags                 flags,
                                        DNSServiceErrorType             errorCode,
                                        const char                      *       name,
                                        const char                      *       regtype,
                                        const char                      *       domain,
                                        void                            *       context
                                        );

                                static void DNSSD_API
                                BrowseCallback
                                        (
                                        DNSServiceRef                   sdRef,
                                        DNSServiceFlags                 flags,
                                        uint32_t                                interfaceIndex,
                                        DNSServiceErrorType             errorCode,
                                        const char                      *       serviceName,
                                        const char                      *       regtype,
                                        const char                      *       replyDomain,
                                        void                            *       context
                                        );

                                static void DNSSD_API
                                ResolveCallback
                                        (
                                        DNSServiceRef                   sdRef,
                                        DNSServiceFlags                 flags,
                                        uint32_t                                interfaceIndex,
                                        DNSServiceErrorType             errorCode,
                                        const char                      *       fullname,
                                        const char                      *       hosttarget,
                                        uint16_t                                notAnIntPort,
                                        uint16_t                                txtLen,
                                        const char                      *       txtRecord,
                                        void                            *       context
                                        );

                                static void DNSSD_API
                                RegisterRecordCallback
                                        ( 
                                        DNSServiceRef           sdRef,
                                        DNSRecordRef            RecordRef,
                                        DNSServiceFlags         flags,
                                        DNSServiceErrorType     errorCode,
                                        void                    *       context
                                        );

                                static void DNSSD_API
                                QueryRecordCallback
                                        (
                                        DNSServiceRef                   DNSServiceRef,
                                        DNSServiceFlags                 flags,
                                        uint32_t                                interfaceIndex,
                                        DNSServiceErrorType             errorCode,
                                        const char                      *       fullname,
                                        uint16_t                                rrtype,
                                        uint16_t                                rrclass,
                                        uint16_t                                rdlen,
                                        const void                      *       rdata,
                                        uint32_t                                ttl,
                                        void                            *       context
                                        );

                                SOCKET                          m_socket;
                                HANDLE                          m_socketEvent;
                                HANDLE                          m_stopEvent;
                                DWORD                           m_threadId;
                                bool                            m_disposed;
                                DNSServiceRef           m_ref;
                                gcroot<ServiceRef*> m_outer;
                        };

                        void
                        StartThread();

                        void
                        ProcessingThread();

                        bool                            m_bDisposed;
                        Object                  *       m_callback;
                        Thread                  *       m_thread;
                        ServiceRefImpl  *       m_impl;
                };
                        
                /*********************************************************************************************
                *
                *   TXT Record Construction Functions
                *
                *********************************************************************************************/

                /*
                * A typical calling sequence for TXT record construction is something like:
                *
                * DNSService.TextRecord tr = new DNSService.TextRecord(1024);
                * tr.SetValue();
                * tr.SetValue();
                * tr.SetValue();
                * ...
                * DNSServiceRegister( ... tr.GetLength(), tr.GetBytes() ... );
                */


                /* TextRecord
                *
                * Opaque internal data type.
                * Note: Represents a DNS-SD TXT record.
                */


                /* TextRecord::TextRecord()
                *
                * Creates a new empty TextRecord .
                *
                */

                public __gc class TextRecord
                {
                public:

                        TextRecord()
                        {
                                m_impl = new TextRecordImpl();
                                TXTRecordCreate(&m_impl->m_ref, 0, NULL);
                        }

                        ~TextRecord()
                        {
                                TXTRecordDeallocate(&m_impl->m_ref);
                                delete m_impl;
                        }

                        __nogc class TextRecordImpl
                        {
                        public:

                                TXTRecordRef m_ref;
                        };

                        TextRecordImpl * m_impl;


                        /* SetValue()
                        *
                        * Adds a key (optionally with value) to a TextRecord. If the "key" already
                        * exists in the TextRecord, then the current value will be replaced with
                        * the new value.
                        * Keys may exist in four states with respect to a given TXT record:
                        *  - Absent (key does not appear at all)
                        *  - Present with no value ("key" appears alone)
                        *  - Present with empty value ("key=" appears in TXT record)
                        *  - Present with non-empty value ("key=value" appears in TXT record)
                        * For more details refer to "Data Syntax for DNS-SD TXT Records" in
                        * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
                        *
                        * key:             A null-terminated string which only contains printable ASCII
                        *                  values (0x20-0x7E), excluding '=' (0x3D). Keys should be
                        *                  14 characters or less (not counting the terminating null).
                        *
                        * value:           Any binary value. For values that represent
                        *                  textual data, UTF-8 is STRONGLY recommended.
                        *                  For values that represent textual data, valueSize
                        *                  should NOT include the terminating null (if any)
                        *                  at the end of the string.
                        *                  If NULL, then "key" will be added with no value.
                        *                  If non-NULL but valueSize is zero, then "key=" will be
                        *                  added with empty value.
                        *
                        * exceptions:      Throws kDNSServiceErr_Invalid if the "key" string contains
                        *                  illegal characters.
                        *                  Throws kDNSServiceErr_NoMemory if adding this key would
                        *                  exceed the available storage.
                        */

                        void
                        SetValue
                                (
                                String  *       key,
                                Byte            value[]  /* may be NULL */
                                );


                        /* RemoveValue()
                        *
                        * Removes a key from a TextRecord.  The "key" must be an
                        * ASCII string which exists in the TextRecord.
                        *
                        * key:             A key name which exists in the TextRecord.
                        *
                        * exceptions:      Throws kDNSServiceErr_NoSuchKey if the "key" does not
                        *                  exist in the TextRecord.
                        *
                        */

                        void
                        RemoveValue
                                (
                                String  *       key
                                );


                        /* GetLength()
                        *
                        * Allows you to determine the length of the raw bytes within a TextRecord.
                        *
                        * return value :     Returns the size of the raw bytes inside a TextRecord
                        *                  which you can pass directly to DNSServiceRegister() or
                        *                  to DNSServiceUpdateRecord().
                        *                  Returns 0 if the TextRecord is empty.
                        *
                        */

                        int
                        GetLength
                                (
                                );


                        /* GetBytes()
                        *
                        * Allows you to retrieve a pointer to the raw bytes within a TextRecord.
                        *
                        * return value:    Returns a pointer to the bytes inside the TextRecord
                        *                  which you can pass directly to DNSServiceRegister() or
                        *                  to DNSServiceUpdateRecord().
                        *
                        */

                        Byte
                        GetBytes
                                (
                                ) __gc[];


                        /*********************************************************************************************
                        *
                        *   TXT Record Parsing Functions
                        *
                        *********************************************************************************************/

                        /*
                        * A typical calling sequence for TXT record parsing is something like:
                        *
                        * Receive TXT record data in DNSServiceResolve() callback
                        * if (TXTRecordContainsKey(txtLen, txtRecord, "key")) then do something
                        * val1ptr = DNSService.TextService.GetValue(txtRecord, "key1", &len1);
                        * val2ptr = DNSService.TextService.GetValue(txtRecord, "key2", &len2);
                        * ...
                        * return;
                        *
                        */

                        /* ContainsKey()
                        *
                        * Allows you to determine if a given TXT Record contains a specified key.
                        *
                        * txtRecord:       Pointer to the received TXT Record bytes.
                        *
                        * key:             A null-terminated ASCII string containing the key name.
                        *
                        * return value:    Returns 1 if the TXT Record contains the specified key.
                        *                  Otherwise, it returns 0.
                        *
                        */

                        static public bool
                        ContainsKey
                                (
                                Byte            txtRecord[],
                                String  *       key
                                );


                        /* GetValueBytes()
                        *
                        * Allows you to retrieve the value for a given key from a TXT Record.
                        *
                        * txtRecord:       Pointer to the received TXT Record bytes.
                        *
                        * key:             A null-terminated ASCII string containing the key name.
                        *
                        * return value:    Returns NULL if the key does not exist in this TXT record,
                        *                  or exists with no value (to differentiate between
                        *                  these two cases use ContainsKey()).
                        *                  Returns byte array 
                        *                  if the key exists with empty or non-empty value.
                        *                  For empty value, length of byte array will be zero.
                        *                  For non-empty value, it will be the length of value data.
                        */

                        static public Byte
                        GetValueBytes
                                (
                                Byte            txtRecord[],
                                String  *       key
                                ) __gc[];


                        /* GetCount()
                        *
                        * Returns the number of keys stored in the TXT Record.  The count
                        * can be used with TXTRecordGetItemAtIndex() to iterate through the keys.
                        *
                        * txtRecord:       Pointer to the received TXT Record bytes.
                        *
                        * return value:    Returns the total number of keys in the TXT Record.
                        *
                        */

                        static public int
                        GetCount
                                (
                                Byte    txtRecord[]
                                );


                        /* GetItemAtIndex()
                        *
                        * Allows you to retrieve a key name and value pointer, given an index into
                        * a TXT Record.  Legal index values range from zero to TXTRecordGetCount()-1.
                        * It's also possible to iterate through keys in a TXT record by simply
                        * calling TXTRecordGetItemAtIndex() repeatedly, beginning with index zero
                        * and increasing until TXTRecordGetItemAtIndex() returns kDNSServiceErr_Invalid.
                        *
                        * On return:
                        * For keys with no value, *value is set to NULL and *valueLen is zero.
                        * For keys with empty value, *value is non-NULL and *valueLen is zero.
                        * For keys with non-empty value, *value is non-NULL and *valueLen is non-zero.
                        *
                        * txtRecord:       Pointer to the received TXT Record bytes.
                        *
                        * index:           An index into the TXT Record.
                        *
                        * key:             A string buffer used to store the key name.
                        *                  On return, the buffer contains a string
                        *                  giving the key name. DNS-SD TXT keys are usually
                        *                  14 characters or less. 
                        *
                        * return value:    Record bytes that holds the value data.
                        *
                        * exceptions:      Throws kDNSServiceErr_Invalid if index is greater than
                        *                  GetCount()-1.
                        */

                        static public Byte
                        GetItemAtIndex
                                (
                                Byte                            txtRecord[],
                                int                                     index,
                                [Out] String    **      key
                                ) __gc[];
                };


                public __abstract __gc class DNSService
                {
                public:

                        /*********************************************************************************************
                        *
                        * Domain Enumeration
                        *
                        *********************************************************************************************/

                        /* DNSServiceEnumerateDomains()
                        *
                        * Asynchronously enumerate domains available for browsing and registration.
                        * Currently, the only domain returned is "local.", but other domains will be returned in future.
                        *
                        * The enumeration MUST be cancelled via DNSServiceRefDeallocate() when no more domains
                        * are to be found.
                        *
                        *
                        * EnumerateDomainsReply Delegate
                        *
                        * This Delegate is invoked upon a reply from an EnumerateDomains call.
                        *
                        * sdRef:           The DNSServiceRef initialized by DNSServiceEnumerateDomains().
                        *
                        * flags:           Possible values are:
                        *                  MoreComing
                        *                  Add
                        *                  Default
                        *
                        * interfaceIndex:  Specifies the interface on which the domain exists.  (The index for a given
                        *                  interface is determined via the if_nametoindex() family of calls.)
                        *
                        * errorCode:       Will be NoError (0) on success, otherwise indicates
                        *                  the failure that occurred (other parameters are undefined if errorCode is nonzero).
                        *
                        * replyDomain:     The name of the domain.
                        *
                        */

                        __delegate void
                        EnumerateDomainsReply
                                (
                                ServiceRef      *       sdRef,
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       replyDomain
                                );

                        /* DNSServiceEnumerateDomains() Parameters:
                        *
                        *
                        * flags:           Possible values are:
                        *                  BrowseDomains to enumerate domains recommended for browsing.
                        *                  RegistrationDomains to enumerate domains recommended
                        *                  for registration.
                        *
                        * interfaceIndex:  If non-zero, specifies the interface on which to look for domains.
                        *                  (the index for a given interface is determined via the if_nametoindex()
                        *                  family of calls.)  Most applications will pass 0 to enumerate domains on
                        *                  all interfaces.
                        *
                        * callback:        The delegate to be called when a domain is found or the call asynchronously
                        *                  fails.
                        *
                        *
                        * return value:    Returns initialize ServiceRef on succeses (any subsequent, asynchronous
                        *                  errors are delivered to the delegate), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is not invoked and the ServiceRef
                        *                  is not initialized.)
                        */

                        static public ServiceRef*
                        EnumerateDomains
                                (
                                int                                                     flags,
                                int                                                     interfaceIndex,
                                EnumerateDomainsReply   *       callback
                                );

                        /*********************************************************************************************
                        *
                        *  Service Registration
                        *
                        *********************************************************************************************/

                        /* Register a service that is discovered via Browse() and Resolve() calls.
                        * 
                        * RegisterReply() Callback Parameters:
                        *
                        * sdRef:           The ServiceRef initialized by Register().
                        *
                        * flags:           Currently unused, reserved for future use.
                        *
                        * errorCode:       Will be NoError on success, otherwise will
                        *                  indicate the failure that occurred (including name conflicts, if the
                        *                  NoAutoRename flag was passed to the
                        *                  callout.)  Other parameters are undefined if errorCode is nonzero.
                        *
                        * name:            The service name registered (if the application did not specify a name in
                        *                  DNSServiceRegister(), this indicates what name was automatically chosen).
                        *
                        * regtype:         The type of service registered, as it was passed to the callout.
                        *
                        * domain:          The domain on which the service was registered (if the application did not
                        *                  specify a domain in Register(), this indicates the default domain
                        *                  on which the service was registered).
                        *
                        */

                        __delegate void
                        RegisterReply
                                (
                                ServiceRef      *       sdRef,
                                ServiceFlags    flags,
                                ErrorCode               errorCode,
                                String          *       name,
                                String          *       regtype,
                                String          *       domain
                                );

                        /* Register()  Parameters:
                        *
                        * flags:           Indicates the renaming behavior on name conflict (most applications
                        *                  will pass 0).  See flag definitions above for details.
                        *
                        * interfaceIndex:  If non-zero, specifies the interface on which to register the service
                        *                  (the index for a given interface is determined via the if_nametoindex()
                        *                  family of calls.)  Most applications will pass 0 to register on all
                        *                  available interfaces.  Pass -1 to register a service only on the local
                        *                  machine (service will not be visible to remote hosts.)
                        *
                        * name:            If non-NULL, specifies the service name to be registered.
                        *                  Most applications will not specify a name, in which case the
                        *                  computer name is used (this name is communicated to the client via
                        *                  the callback).
                        *
                        * regtype:         The service type followed by the protocol, separated by a dot
                        *                  (e.g. "_ftp._tcp").  The transport protocol must be "_tcp" or "_udp".
                        *                  New service types should be registered at htp://www.dns-sd.org/ServiceTypes.html.
                        *
                        * domain:          If non-NULL, specifies the domain on which to advertise the service.
                        *                  Most applications will not specify a domain, instead automatically
                        *                  registering in the default domain(s).
                        *
                        * host:            If non-NULL, specifies the SRV target host name.  Most applications
                        *                  will not specify a host, instead automatically using the machine's
                        *                  default host name(s).  Note that specifying a non-NULL host does NOT
                        *                  create an address record for that host - the application is responsible
                        *                  for ensuring that the appropriate address record exists, or creating it
                        *                  via DNSServiceRegisterRecord().
                        *
                        * port:            The port, in host byte order, on which the service accepts connections.
                        *                  Pass 0 for a "placeholder" service (i.e. a service that will not be discovered
                        *                  by browsing, but will cause a name conflict if another client tries to
                        *                  register that same name).  Most clients will not use placeholder services.
                        *
                        * txtRecord:       The txt record rdata.  May be NULL.  Note that a non-NULL txtRecord
                        *                  MUST be a properly formatted DNS TXT record, i.e. <length byte> <data>
                        *                  <length byte> <data> ...
                        *
                        * callback:        The delegate to be called when the registration completes or asynchronously
                        *                  fails.  The client MAY pass NULL for the callback -  The client will NOT be notified
                        *                  of the default values picked on its behalf, and the client will NOT be notified of any
                        *                  asynchronous errors (e.g. out of memory errors, etc.) that may prevent the registration
                        *                  of the service.  The client may NOT pass the NoAutoRename flag if the callback is NULL.
                        *                  The client may still deregister the service at any time via DNSServiceRefDeallocate().
                        *
                        * return value:    Returns initialize ServiceRef (any subsequent, asynchronous
                        *                  errors are delivered to the callback), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is never invoked and the DNSServiceRef
                        *                  is not initialized.)
                        *
                        */
                        static public ServiceRef*
                        Register
                                (
                                int                                     flags,
                                int                                     interfaceIndex,
                                String                  *       name,
                                String                  *       regtype,
                                String                  *       domain,
                                String                  *       host,
                                int                                     port,
                                Byte                            txtRecord[],
                                RegisterReply   *       callback
                                );

                        /* AddRecord()
                        *
                        * Add a record to a registered service.  The name of the record will be the same as the
                        * registered service's name.
                        * The record can later be updated or deregistered by passing the RecordRef initialized
                        * by this function to UpdateRecord() or RemoveRecord().
                        *
                        *
                        * Parameters;
                        *
                        * sdRef:           A ServiceRef initialized by Register().
                        *
                        * RecordRef:       A pointer to an uninitialized RecordRef.  Upon succesfull completion of this
                        *                  call, this ref may be passed to UpdateRecord() or RemoveRecord().
                        *                  If the above ServiceRef is disposed, RecordRef is also
                        *                  invalidated and may not be used further.
                        *
                        * flags:           Currently ignored, reserved for future use.
                        *
                        * rrtype:          The type of the record (e.g. TXT, SRV, etc), as defined in nameser.h.
                        *
                        * rdata:           The raw rdata to be contained in the added resource record.
                        *
                        * ttl:             The time to live of the resource record, in seconds.
                        *
                        * return value:    Returns initialized RecordRef, otherwise throws
                        *                  an exception indicating the error that occurred (the RecordRef is not initialized).
                        */

                        static public RecordRef*
                        AddRecord
                                (
                                ServiceRef      *       sref,
                                int                             flags,
                                int                             rrtype,
                                Byte                    rdata[],
                                int                             ttl
                                );

                        /* UpdateRecord
                        *
                        * Update a registered resource record.  The record must either be:
                        *   - The primary txt record of a service registered via Register()
                        *   - A record added to a registered service via AddRecord()
                        *   - An individual record registered by RegisterRecord()
                        *
                        *
                        * Parameters:
                        *
                        * sdRef:           A ServiceRef that was initialized by Register()
                        *                  or CreateConnection().
                        *
                        * RecordRef:       A RecordRef initialized by AddRecord, or NULL to update the
                        *                  service's primary txt record.
                        *
                        * flags:           Currently ignored, reserved for future use.
                        *
                        * rdata:           The new rdata to be contained in the updated resource record.
                        *
                        * ttl:             The time to live of the updated resource record, in seconds.
                        *
                        * return value:    No return value on success, otherwise throws an exception
                        *                  indicating the error that occurred.
                        */
                        static public void
                        UpdateRecord
                                (
                                ServiceRef      *       sref,
                                RecordRef       *       record,
                                int                             flags,
                                Byte                    rdata[],
                                int                             ttl
                                );

                        /* RemoveRecord
                        *
                        * Remove a record previously added to a service record set via AddRecord(), or deregister
                        * an record registered individually via RegisterRecord().
                        *
                        * Parameters:
                        *
                        * sdRef:           A ServiceRef initialized by Register() (if the
                        *                  record being removed was registered via AddRecord()) or by
                        *                  CreateConnection() (if the record being removed was registered via
                        *                  RegisterRecord()).
                        *
                        * recordRef:       A RecordRef initialized by a successful call to AddRecord()
                        *                  or RegisterRecord().
                        *
                        * flags:           Currently ignored, reserved for future use.
                        *
                        * return value:    Nothing on success, otherwise throws an
                        *                  exception indicating the error that occurred.
                        */

                        static public void
                        RemoveRecord
                                                        (
                                                        ServiceRef      *       sref,
                                                        RecordRef       *       record, 
                                                        int                             flags
                                                        );

                        /*********************************************************************************************
                        *
                        *  Service Discovery
                        *
                        *********************************************************************************************/

                        /* Browse for instances of a service.
                        *
                        *
                        * BrowseReply() Parameters:
                        *
                        * sdRef:           The DNSServiceRef initialized by Browse().
                        *
                        * flags:           Possible values are MoreComing and Add.
                        *                  See flag definitions for details.
                        *
                        * interfaceIndex:  The interface on which the service is advertised.  This index should
                        *                  be passed to Resolve() when resolving the service.
                        *
                        * errorCode:       Will be NoError (0) on success, otherwise will
                        *                  indicate the failure that occurred.  Other parameters are undefined if
                        *                  the errorCode is nonzero.
                        *
                        * serviceName:     The service name discovered.
                        *
                        * regtype:         The service type, as passed in to Browse().
                        * 
                        * domain:          The domain on which the service was discovered (if the application did not
                        *                  specify a domain in Browse(), this indicates the domain on which the
                        *                  service was discovered.)
                        *
                        */

                        __delegate void
                        BrowseReply
                                (
                                ServiceRef      *       sdRef,
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       name,
                                String          *       type,
                                String          *       domain
                                );

                        /* DNSServiceBrowse() Parameters:
                        *
                        * sdRef:           A pointer to an uninitialized ServiceRef.  Call ServiceRef.Dispose()
                        *                  to terminate the browse.
                        *
                        * flags:           Currently ignored, reserved for future use.
                        *
                        * interfaceIndex:  If non-zero, specifies the interface on which to browse for services
                        *                  (the index for a given interface is determined via the if_nametoindex()
                        *                  family of calls.)  Most applications will pass 0 to browse on all available
                        *                  interfaces.  Pass -1 to only browse for services provided on the local host.
                        *
                        * regtype:         The service type being browsed for followed by the protocol, separated by a
                        *                  dot (e.g. "_ftp._tcp").  The transport protocol must be "_tcp" or "_udp".
                        *
                        * domain:          If non-NULL, specifies the domain on which to browse for services.
                        *                  Most applications will not specify a domain, instead browsing on the
                        *                  default domain(s).
                        *
                        * callback:        The delegate to be called when an instance of the service being browsed for
                        *                  is found, or if the call asynchronously fails.
                        *
                        * return value:    Returns initialized ServiceRef on succeses (any subsequent, asynchronous
                        *                  errors are delivered to the callback), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is not invoked and the ServiceRef
                        *                  is not initialized.)
                        */

                        static public ServiceRef*
                        Browse
                                (
                                int                             flags,
                                int                             interfaceIndex,
                                String          *       regtype,
                                String          *       domain,
                                BrowseReply     *       callback
                                );

                        /* ResolveReply() Parameters:
                        *
                        * Resolve a service name discovered via Browse() to a target host name, port number, and
                        * txt record.
                        *
                        * Note: Applications should NOT use Resolve() solely for txt record monitoring - use
                        * QueryRecord() instead, as it is more efficient for this task.
                        *
                        * Note: When the desired results have been returned, the client MUST terminate the resolve by calling
                        * ServiceRef.Dispose().
                        *
                        * Note: Resolve() behaves correctly for typical services that have a single SRV record and
                        * a single TXT record (the TXT record may be empty.)  To resolve non-standard services with multiple
                        * SRV or TXT records, QueryRecord() should be used.
                        *
                        * ResolveReply Callback Parameters:
                        *
                        * sdRef:           The DNSServiceRef initialized by Resolve().
                        *
                        * flags:           Currently unused, reserved for future use.
                        *
                        * interfaceIndex:  The interface on which the service was resolved.
                        *
                        * errorCode:       Will be NoError (0) on success, otherwise will
                        *                  indicate the failure that occurred.  Other parameters are undefined if
                        *                  the errorCode is nonzero.
                        *
                        * fullname:        The full service domain name, in the form <servicename>.<protocol>.<domain>.
                        *                  (Any literal dots (".") are escaped with a backslash ("\."), and literal
                        *                  backslashes are escaped with a second backslash ("\\"), e.g. a web server
                        *                  named "Dr. Pepper" would have the fullname  "Dr\.\032Pepper._http._tcp.local.").
                        *                  This is the appropriate format to pass to standard system DNS APIs such as
                        *                  res_query(), or to the special-purpose functions included in this API that
                        *                  take fullname parameters.
                        *
                        * hosttarget:      The target hostname of the machine providing the service.  This name can
                        *                  be passed to functions like gethostbyname() to identify the host's IP address.
                        *
                        * port:            The port, in host byte order, on which connections are accepted for this service.
                        *
                        * txtRecord:       The service's primary txt record, in standard txt record format.
                        *
                        */

                        __delegate void
                        ResolveReply
                                (       
                                ServiceRef      *       sdRef,  
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,
                                String          *       fullName,
                                String          *       hostName,
                                int                             port,
                                Byte                    txtRecord[]
                                );

                        /* Resolve() Parameters
                        *
                        * flags:           Currently ignored, reserved for future use.
                        *
                        * interfaceIndex:  The interface on which to resolve the service.  The client should
                        *                  pass the interface on which the servicename was discovered, i.e.
                        *                  the interfaceIndex passed to the DNSServiceBrowseReply callback,
                        *                  or 0 to resolve the named service on all available interfaces.
                        *
                        * name:            The servicename to be resolved.
                        *
                        * regtype:         The service type being resolved followed by the protocol, separated by a
                        *                  dot (e.g. "_ftp._tcp").  The transport protocol must be "_tcp" or "_udp".
                        *
                        * domain:          The domain on which the service is registered, i.e. the domain passed
                        *                  to the DNSServiceBrowseReply callback.
                        *
                        * callback:        The delegate to be called when a result is found, or if the call
                        *                  asynchronously fails.
                        *
                        *
                        * return value:    Returns initialized ServiceRef on succeses (any subsequent, asynchronous
                        *                  errors are delivered to the callback), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is never invoked and the DNSServiceRef
                        *                  is not initialized.)
                        */

                        static public ServiceRef*
                        Resolve
                                (
                                int                                     flags,
                                int                                     interfaceIndex,
                                String                  *       name,
                                String                  *       regtype,
                                String                  *       domain,
                                ResolveReply    *       callback
                                );

                        /*********************************************************************************************
                        *
                        *  Special Purpose Calls (most applications will not use these)
                        *
                        *********************************************************************************************/

                        /* CreateConnection/RegisterRecord
                        *
                        * Register an individual resource record on a connected ServiceRef.
                        *
                        * Note that name conflicts occurring for records registered via this call must be handled
                        * by the client in the callback.
                        *
                        *
                        * RecordReply() parameters:
                        *
                        * sdRef:           The connected ServiceRef initialized by
                        *                  CreateConnection().
                        *
                        * RecordRef:       The RecordRef initialized by RegisterRecord().  If the above
                        *                  ServiceRef.Dispose is called, this RecordRef is
                        *                  invalidated, and may not be used further.
                        *
                        * flags:           Currently unused, reserved for future use.
                        *
                        * errorCode:       Will be NoError on success, otherwise will
                        *                  indicate the failure that occurred (including name conflicts.)
                        *                  Other parameters are undefined if errorCode is nonzero.
                        *
                        */

                        __delegate void
                        RegisterRecordReply
                                (
                                ServiceRef      *       sdRef,
                                ServiceFlags    flags,
                                ErrorCode               errorCode,
                                RecordRef       *       record
                                );

                        /* CreateConnection()
                        *
                        * Create a connection to the daemon allowing efficient registration of
                        * multiple individual records.
                        *
                        *
                        * Parameters:
                        *
                        * callback:        The delegate to be called when a result is found, or if the call
                        *                  asynchronously fails (e.g. because of a name conflict.)
                        *
                        * return value:    Returns initialize ServiceRef on success, otherwise throws
                        *                  an exception indicating the specific failure that occurred (in which
                        *                  case the ServiceRef is not initialized).
                        */

                        static public ServiceRef*
                        CreateConnection
                                (
                                RegisterRecordReply * callback
                                );


                        /* RegisterRecord() Parameters:
                        *
                        * sdRef:           A ServiceRef initialized by CreateConnection().
                        *
                        * RecordRef:       A pointer to an uninitialized RecordRef.  Upon succesfull completion of this
                        *                  call, this ref may be passed to UpdateRecord() or RemoveRecord().
                        *                  (To deregister ALL records registered on a single connected ServiceRef
                        *                  and deallocate each of their corresponding RecordRefs, call
                        *                  ServiceRef.Dispose()).
                        *
                        * flags:           Possible values are Shared or Unique
                        *                  (see flag type definitions for details).
                        *
                        * interfaceIndex:  If non-zero, specifies the interface on which to register the record
                        *                  (the index for a given interface is determined via the if_nametoindex()
                        *                  family of calls.)  Passing 0 causes the record to be registered on all interfaces.
                        *                  Passing -1 causes the record to only be visible on the local host.
                        *
                        * fullname:        The full domain name of the resource record.
                        *
                        * rrtype:          The numerical type of the resource record (e.g. PTR, SRV, etc), as defined
                        *                  in nameser.h.
                        *
                        * rrclass:         The class of the resource record, as defined in nameser.h (usually 1 for the
                        *                  Internet class).
                        *
                        * rdata:           A pointer to the raw rdata, as it is to appear in the DNS record.
                        *
                        * ttl:             The time to live of the resource record, in seconds.
                        *
                        *
                        * return value:    Returns initialize RecordRef on succeses (any subsequent, asynchronous
                        *                  errors are delivered to the callback), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is never invoked and the RecordRef is
                        *                  not initialized.)
                        */
                        static public RecordRef*
                        RegisterRecord
                                (
                                ServiceRef                      *       sdRef,
                                ServiceFlags                    flags,
                                int                                             interfaceIndex,
                                String                          *       fullname,
                                int                                             rrtype,
                                int                                             rrclass,
                                Byte                                    rdata[],
                                int                                             ttl
                                );


                        /* DNSServiceQueryRecord
                        *
                        * Query for an arbitrary DNS record.
                        *
                        *
                        * QueryRecordReply() Delegate Parameters:
                        *
                        * sdRef:           The ServiceRef initialized by QueryRecord().
                        *
                        * flags:           Possible values are MoreComing and
                        *                  Add.  The Add flag is NOT set for PTR records
                        *                  with a ttl of 0, i.e. "Remove" events.
                        *
                        * interfaceIndex:  The interface on which the query was resolved (the index for a given
                        *                  interface is determined via the if_nametoindex() family of calls).
                        *
                        * errorCode:       Will be kDNSServiceErr_NoError on success, otherwise will
                        *                  indicate the failure that occurred.  Other parameters are undefined if
                        *                  errorCode is nonzero.
                        *
                        * fullname:        The resource record's full domain name.
                        *
                        * rrtype:          The resource record's type (e.g. PTR, SRV, etc) as defined in nameser.h.
                        *
                        * rrclass:         The class of the resource record, as defined in nameser.h (usually 1).
                        *
                        * rdata:           The raw rdata of the resource record.
                        *
                        * ttl:             The resource record's time to live, in seconds.
                        *
                        */

                        __delegate void
                        QueryRecordReply
                                (
                                ServiceRef      *       sdRef,
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                ErrorCode               errorCode,      
                                String          *       fullName,
                                int                             rrtype,
                                int                             rrclass,
                                Byte                    rdata[],
                                int                             ttl
                                );

                        /* QueryRecord() Parameters:
                        *
                        * flags:           Pass LongLivedQuery to create a "long-lived" unicast
                        *                  query in a non-local domain.  Without setting this flag, unicast queries
                        *                  will be one-shot - that is, only answers available at the time of the call
                        *                  will be returned.  By setting this flag, answers (including Add and Remove
                        *                  events) that become available after the initial call is made will generate
                        *                  callbacks.  This flag has no effect on link-local multicast queries.
                        *
                        * interfaceIndex:  If non-zero, specifies the interface on which to issue the query
                        *                  (the index for a given interface is determined via the if_nametoindex()
                        *                  family of calls.)  Passing 0 causes the name to be queried for on all
                        *                  interfaces.  Passing -1 causes the name to be queried for only on the
                        *                  local host.
                        *
                        * fullname:        The full domain name of the resource record to be queried for.
                        *
                        * rrtype:          The numerical type of the resource record to be queried for (e.g. PTR, SRV, etc)
                        *                  as defined in nameser.h.
                        *
                        * rrclass:         The class of the resource record, as defined in nameser.h
                        *                  (usually 1 for the Internet class).
                        *
                        * callback:        The delegate to be called when a result is found, or if the call
                        *                  asynchronously fails.
                        *
                        *
                        * return value:    Returns initialized ServiceRef on succeses (any subsequent, asynchronous
                        *                  errors are delivered to the callback), otherwise throws an exception indicating
                        *                  the error that occurred (the callback is never invoked and the ServiceRef
                        *                  is not initialized.)
                        */

                        static public ServiceRef*
                        QueryRecord
                                (
                                ServiceFlags                    flags,
                                int                                             interfaceIndex,
                                String                          *       fullname,
                                int                                             rrtype,
                                int                                             rrclass,
                                QueryRecordReply        *       callback
                                );

                        /* ReconfirmRecord
                        *
                        * Instruct the daemon to verify the validity of a resource record that appears to
                        * be out of date (e.g. because tcp connection to a service's target failed.)
                        * Causes the record to be flushed from the daemon's cache (as well as all other
                        * daemons' caches on the network) if the record is determined to be invalid.
                        *
                        * Parameters:
                        *
                        * flags:           Currently unused, reserved for future use.
                        *
                        * fullname:        The resource record's full domain name.
                        *
                        * rrtype:          The resource record's type (e.g. PTR, SRV, etc) as defined in nameser.h.
                        *
                        * rrclass:         The class of the resource record, as defined in nameser.h (usually 1).
                        *
                        * rdata:           The raw rdata of the resource record.
                        *
                        */
                        static public void
                        ReconfirmRecord
                                (
                                ServiceFlags    flags,
                                int                             interfaceIndex,
                                String          *       fullname,
                                int                             rrtype,
                                int                             rrclass,
                                Byte                    rdata[]
                                );
                };
        }
}