final rename

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@698 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

1 files changed, 1670 insertions, 0 deletions

diff --git a/avahi-compat-libdns_sd/dns_sd.h b/avahi-compat-libdns_sd/dns_sd.h
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+++ b/avahi-compat-libdns_sd/dns_sd.h
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+/*
+ * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright notice, 
+ *     this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright notice, 
+ *     this list of conditions and the following disclaimer in the documentation 
+ *     and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of its 
+ *     contributors may be used to endorse or promote products derived from this 
+ *     software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _DNS_SD_H
+#define _DNS_SD_H
+
+#ifdef  __cplusplus
+    extern "C" {
+#endif
+
+/* standard calling convention under Win32 is __stdcall */
+#if defined(_WIN32)
+#define DNSSD_API __stdcall
+#else
+#define DNSSD_API
+#endif
+
+#if defined(__FreeBSD_version) && (__FreeBSD_version < 500000)
+/* stdint.h does not exist on FreeBSD 4.x; its types are defined in sys/types.h instead */
+#include <sys/types.h>
+#elif defined(__sun__)
+#include <sys/types.h>
+#elif defined(_WIN32)
+#include <windows.h>
+#define _UNUSED
+#define bzero(a, b) memset(a, 0, b)
+#ifndef _MSL_STDINT_H
+typedef UINT8       uint8_t;
+typedef INT8        int8_t;
+typedef UINT16      uint16_t;
+typedef INT16       int16_t;
+typedef UINT32      uint32_t;
+typedef INT32       int32_t;
+#endif
+#else
+#include <stdint.h>
+#endif
+
+/* DNSServiceRef, DNSRecordRef
+ *
+ * Opaque internal data types.
+ * Note: client is responsible for serializing access to these structures if
+ * they are shared between concurrent threads.
+ */
+
+typedef struct _DNSServiceRef_t *DNSServiceRef;
+typedef struct _DNSRecordRef_t *DNSRecordRef;
+
+/* General flags used in functions defined below */
+enum
+    {
+    kDNSServiceFlagsMoreComing          = 0x1,
+    /* 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.
+     */
+
+    kDNSServiceFlagsAdd                 = 0x2,
+    kDNSServiceFlagsDefault             = 0x4,
+    /* 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.
+     */
+
+    kDNSServiceFlagsNoAutoRename        = 0x8,
+    /* 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.)
+     */
+
+    kDNSServiceFlagsShared              = 0x10,
+    kDNSServiceFlagsUnique              = 0x20,
+    /* 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).
+     */
+
+    kDNSServiceFlagsBrowseDomains       = 0x40,
+    kDNSServiceFlagsRegistrationDomains = 0x80,
+    /* Flags for specifying domain enumeration type in DNSServiceEnumerateDomains.
+     * BrowseDomains enumerates domains recommended for browsing, RegistrationDomains
+     * enumerates domains recommended for registration.
+     */
+
+    kDNSServiceFlagsLongLivedQuery      = 0x100,
+    /* Flag for creating a long-lived unicast query for the DNSServiceQueryRecord call. */
+
+    kDNSServiceFlagsAllowRemoteQuery    = 0x200,
+    /* Flag for creating a record for which we will answer remote queries
+     * (queries from hosts more than one hop away; hosts not directly connected to the local link).
+     */
+
+    kDNSServiceFlagsForceMulticast      = 0x400
+    /* Flag for signifying that a query or registration should be performed exclusively via multicast DNS,
+     * even for a name in a domain (e.g. foo.apple.com.) that would normally imply unicast DNS.
+     */
+    };
+
+/*
+ * The values for DNS Classes and Types are listed in RFC 1035, and are available
+ * on every OS in its DNS header file. Unfortunately every OS does not have the
+ * same header file containing DNS Class and Type constants, and the names of
+ * the constants are not consistent. For example, BIND 8 uses "T_A",
+ * BIND 9 uses "ns_t_a", Windows uses "DNS_TYPE_A", etc.
+ * For this reason, these constants are also listed here, so that code using
+ * the DNS-SD programming APIs can use these constants, so that the same code
+ * can compile on all our supported platforms.
+ */
+
+enum
+    {
+    kDNSServiceClass_IN       = 1       /* Internet */
+    };
+
+enum
+    {
+    kDNSServiceType_A         = 1,      /* Host address. */
+    kDNSServiceType_NS        = 2,      /* Authoritative server. */
+    kDNSServiceType_MD        = 3,      /* Mail destination. */
+    kDNSServiceType_MF        = 4,      /* Mail forwarder. */
+    kDNSServiceType_CNAME     = 5,      /* Canonical name. */
+    kDNSServiceType_SOA       = 6,      /* Start of authority zone. */
+    kDNSServiceType_MB        = 7,      /* Mailbox domain name. */
+    kDNSServiceType_MG        = 8,      /* Mail group member. */
+    kDNSServiceType_MR        = 9,      /* Mail rename name. */
+    kDNSServiceType_NULL      = 10,     /* Null resource record. */
+    kDNSServiceType_WKS       = 11,     /* Well known service. */
+    kDNSServiceType_PTR       = 12,     /* Domain name pointer. */
+    kDNSServiceType_HINFO     = 13,     /* Host information. */
+    kDNSServiceType_MINFO     = 14,     /* Mailbox information. */
+    kDNSServiceType_MX        = 15,     /* Mail routing information. */
+    kDNSServiceType_TXT       = 16,     /* One or more text strings. */
+    kDNSServiceType_RP        = 17,     /* Responsible person. */
+    kDNSServiceType_AFSDB     = 18,     /* AFS cell database. */
+    kDNSServiceType_X25       = 19,     /* X_25 calling address. */
+    kDNSServiceType_ISDN      = 20,     /* ISDN calling address. */
+    kDNSServiceType_RT        = 21,     /* Router. */
+    kDNSServiceType_NSAP      = 22,     /* NSAP address. */
+    kDNSServiceType_NSAP_PTR  = 23,     /* Reverse NSAP lookup (deprecated). */
+    kDNSServiceType_SIG       = 24,     /* Security signature. */
+    kDNSServiceType_KEY       = 25,     /* Security key. */
+    kDNSServiceType_PX        = 26,     /* X.400 mail mapping. */
+    kDNSServiceType_GPOS      = 27,     /* Geographical position (withdrawn). */
+    kDNSServiceType_AAAA      = 28,     /* Ip6 Address. */
+    kDNSServiceType_LOC       = 29,     /* Location Information. */
+    kDNSServiceType_NXT       = 30,     /* Next domain (security). */
+    kDNSServiceType_EID       = 31,     /* Endpoint identifier. */
+    kDNSServiceType_NIMLOC    = 32,     /* Nimrod Locator. */
+    kDNSServiceType_SRV       = 33,     /* Server Selection. */
+    kDNSServiceType_ATMA      = 34,     /* ATM Address */
+    kDNSServiceType_NAPTR     = 35,     /* Naming Authority PoinTeR */
+    kDNSServiceType_KX        = 36,     /* Key Exchange */
+    kDNSServiceType_CERT      = 37,     /* Certification record */
+    kDNSServiceType_A6        = 38,     /* IPv6 address (deprecates AAAA) */
+    kDNSServiceType_DNAME     = 39,     /* Non-terminal DNAME (for IPv6) */
+    kDNSServiceType_SINK      = 40,     /* Kitchen sink (experimentatl) */
+    kDNSServiceType_OPT       = 41,     /* EDNS0 option (meta-RR) */
+    kDNSServiceType_TKEY      = 249,    /* Transaction key */
+    kDNSServiceType_TSIG      = 250,    /* Transaction signature. */
+    kDNSServiceType_IXFR      = 251,    /* Incremental zone transfer. */
+    kDNSServiceType_AXFR      = 252,    /* Transfer zone of authority. */
+    kDNSServiceType_MAILB     = 253,    /* Transfer mailbox records. */
+    kDNSServiceType_MAILA     = 254,    /* Transfer mail agent records. */
+    kDNSServiceType_ANY       = 255     /* Wildcard match. */
+    };
+
+
+/* possible error code values */
+enum
+    {
+    kDNSServiceErr_NoError             = 0,
+    kDNSServiceErr_Unknown             = -65537,       /* 0xFFFE FFFF */
+    kDNSServiceErr_NoSuchName          = -65538,
+    kDNSServiceErr_NoMemory            = -65539,
+    kDNSServiceErr_BadParam            = -65540,
+    kDNSServiceErr_BadReference        = -65541,
+    kDNSServiceErr_BadState            = -65542,
+    kDNSServiceErr_BadFlags            = -65543,
+    kDNSServiceErr_Unsupported         = -65544,
+    kDNSServiceErr_NotInitialized      = -65545,
+    kDNSServiceErr_AlreadyRegistered   = -65547,
+    kDNSServiceErr_NameConflict        = -65548,
+    kDNSServiceErr_Invalid             = -65549,
+    kDNSServiceErr_Firewall            = -65550,
+    kDNSServiceErr_Incompatible        = -65551,        /* client library incompatible with daemon */
+    kDNSServiceErr_BadInterfaceIndex   = -65552,
+    kDNSServiceErr_Refused             = -65553,
+    kDNSServiceErr_NoSuchRecord        = -65554,
+    kDNSServiceErr_NoAuth              = -65555,
+    kDNSServiceErr_NoSuchKey           = -65556,
+    kDNSServiceErr_NATTraversal        = -65557,
+    kDNSServiceErr_DoubleNAT           = -65558,
+    kDNSServiceErr_BadTime             = -65559
+    /* mDNS Error codes are in the range
+     * FFFE FF00 (-65792) to FFFE FFFF (-65537) */
+    };
+
+
+/* Maximum length, in bytes, of a service name represented as a */
+/* literal C-String, including the terminating NULL at the end. */
+
+#define kDNSServiceMaxServiceName 64
+
+/* Maximum length, in bytes, of a domain name represented as an *escaped* C-String */
+/* including the final trailing dot, and the C-String terminating NULL at the end. */
+
+#define kDNSServiceMaxDomainName 1005
+
+/*
+ * Notes on DNS Name Escaping
+ *   -- or --
+ * "Why is kDNSServiceMaxDomainName 1005, when the maximum legal domain name is 255 bytes?"
+ *
+ * All strings used in DNS-SD are UTF-8 strings.
+ * With few exceptions, most are also escaped using standard DNS escaping rules:
+ *
+ *   '\\' represents a single literal '\' in the name
+ *   '\.' represents a single literal '.' in the name
+ *   '\ddd', where ddd is a three-digit decimal value from 000 to 255,
+ *        represents a single literal byte with that value.
+ *   A bare unescaped '.' is a label separator, marking a boundary between domain and subdomain.
+ *
+ * The exceptions, that do not use escaping, are the routines where the full
+ * DNS name of a resource is broken, for convenience, into servicename/regtype/domain.
+ * In these routines, the "servicename" is NOT escaped. It does not need to be, since
+ * it is, by definition, just a single literal string. Any characters in that string
+ * represent exactly what they are. The "regtype" portion is, technically speaking,
+ * escaped, but since legal regtypes are only allowed to contain letters, digits,
+ * and hyphens, there is nothing to escape, so the issue is moot. The "domain"
+ * portion is also escaped, though most domains in use on the public Internet
+ * today, like regtypes, don't contain any characters that need to be escaped.
+ * As DNS-SD becomes more popular, rich-text domains for service discovery will
+ * become common, so software should be written to cope with domains with escaping.
+ *
+ * The servicename may be up to 63 bytes of UTF-8 text (not counting the C-String
+ * terminating NULL at the end). The regtype is of the form _service._tcp or
+ * _service._udp, where the "service" part is 1-14 characters, which may be
+ * letters, digits, or hyphens. The domain part of the three-part name may be
+ * any legal domain, providing that the resulting servicename+regtype+domain
+ * name does not exceed 255 bytes.
+ *
+ * For most software, these issues are transparent. When browsing, the discovered
+ * servicenames should simply be displayed as-is. When resolving, the discovered
+ * servicename/regtype/domain are simply passed unchanged to DNSServiceResolve().
+ * When a DNSServiceResolve() succeeds, the returned fullname is already in
+ * the correct format to pass to standard system DNS APIs such as res_query().
+ * For converting from servicename/regtype/domain to a single properly-escaped
+ * full DNS name, the helper function DNSServiceConstructFullName() is provided.
+ *
+ * The following (highly contrived) example illustrates the escaping process.
+ * Suppose you have an service called "Dr. Smith\Dr. Johnson", of type "_ftp._tcp"
+ * in subdomain "4th. Floor" of subdomain "Building 2" of domain "apple.com."
+ * The full (escaped) DNS name of this service's SRV record would be:
+ * Dr\.\032Smith\\Dr\.\032Johnson._ftp._tcp.4th\.\032Floor.Building\0322.apple.com.
+ */
+
+
+/* 
+ * Constants for specifying an interface index
+ *
+ * Specific interface indexes are identified via a 32-bit unsigned integer returned
+ * by the if_nametoindex() family of calls.
+ * 
+ * If the client passes 0 for interface index, that means "do the right thing",
+ * which (at present) means, "if the name is in an mDNS local multicast domain
+ * (e.g. 'local.', '254.169.in-addr.arpa.', '0.8.E.F.ip6.arpa.') then multicast
+ * on all applicable interfaces, otherwise send via unicast to the appropriate
+ * DNS server." Normally, most clients will use 0 for interface index to
+ * automatically get the default sensible behaviour.
+ * 
+ * If the client passes a positive interface index, then for multicast names that
+ * indicates to do the operation only on that one interface. For unicast names the
+ * interface index is ignored unless kDNSServiceFlagsForceMulticast is also set.
+ * 
+ * If the client passes kDNSServiceInterfaceIndexLocalOnly when registering
+ * a service, then that service will be found *only* by other local clients
+ * on the same machine that are browsing using kDNSServiceInterfaceIndexLocalOnly
+ * or kDNSServiceInterfaceIndexAny.
+ * If a client has a 'private' service, accessible only to other processes
+ * running on the same machine, this allows the client to advertise that service
+ * in a way such that it does not inadvertently appear in service lists on
+ * all the other machines on the network.
+ * 
+ * If the client passes kDNSServiceInterfaceIndexLocalOnly when browsing
+ * then it will find *all* records registered on that same local machine.
+ * Clients explicitly wishing to discover *only* LocalOnly services can
+ * accomplish this by inspecting the interfaceIndex of each service reported
+ * to their DNSServiceBrowseReply() callback function, and discarding those
+ * where the interface index is not kDNSServiceInterfaceIndexLocalOnly.
+ */
+
+#define kDNSServiceInterfaceIndexAny 0
+#define kDNSServiceInterfaceIndexLocalOnly ( (uint32_t) -1 )
+
+
+typedef uint32_t DNSServiceFlags;
+typedef int32_t DNSServiceErrorType;
+
+
+/*********************************************************************************************
+ *
+ * Unix Domain Socket access, DNSServiceRef deallocation, and data processing functions
+ *
+ *********************************************************************************************/
+
+
+/* DNSServiceRefSockFD()
+ *
+ * Access underlying Unix domain socket for an initialized DNSServiceRef.
+ * The DNS Service Discovery implmementation uses this socket to communicate between
+ * the client and the mDNSResponder daemon.  The application MUST NOT directly read from
+ * or write to this socket.  Access to the socket is provided so that it can be used as a
+ * run loop source, or in a select() loop: when data is available for reading on the socket,
+ * DNSServiceProcessResult() should be called, which will extract the daemon's reply from
+ * the socket, and pass it to the appropriate application callback.  By using a run loop or
+ * select(), results from the daemon can be processed asynchronously.  Without using these
+ * constructs, DNSServiceProcessResult() will block until the response from the daemon arrives.
+ * The client is responsible for ensuring that the data on the socket is processed in a timely
+ * fashion - the daemon may terminate its connection with a client that does not clear its
+ * socket buffer.
+ *
+ * sdRef:            A DNSServiceRef initialized by any of the DNSService calls.
+ *
+ * return value:    The DNSServiceRef's underlying socket descriptor, or -1 on
+ *                  error.
+ */
+
+int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdRef);
+
+
+/* DNSServiceProcessResult()
+ *
+ * Read a reply from the daemon, calling the appropriate application callback.  This call will
+ * block until the daemon's response is received.  Use DNSServiceRefSockFD() in
+ * conjunction with a run loop or select() to determine the presence of a response from the
+ * server before calling this function to process the reply without blocking.  Call this function
+ * at any point if it is acceptable to block until the daemon's response arrives.  Note that the
+ * client is responsible for ensuring that DNSServiceProcessResult() is called whenever there is
+ * a reply from the daemon - the daemon may terminate its connection with a client that does not
+ * process the daemon's responses.
+ *
+ * sdRef:           A DNSServiceRef initialized by any of the DNSService calls
+ *                  that take a callback parameter.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success, otherwise returns
+ *                  an error code indicating the specific failure that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdRef);
+
+
+/* DNSServiceRefDeallocate()
+ *
+ * Terminate a connection with the daemon and free memory associated with the DNSServiceRef.
+ * Any services or records registered with this DNSServiceRef will be deregistered. Any
+ * Browse, Resolve, or Query operations called with this reference will be terminated.
+ *
+ * Note: If the reference's underlying socket is used in a run loop or select() call, it should
+ * be removed BEFORE DNSServiceRefDeallocate() is called, as this function closes the reference's
+ * socket.
+ *
+ * Note: If the reference was initialized with DNSServiceCreateConnection(), any DNSRecordRefs
+ * created via this reference will be invalidated by this call - the resource records are
+ * deregistered, and their DNSRecordRefs may not be used in subsequent functions.  Similarly,
+ * if the reference was initialized with DNSServiceRegister, and an extra resource record was
+ * added to the service via DNSServiceAddRecord(), the DNSRecordRef created by the Add() call
+ * is invalidated when this function is called - the DNSRecordRef may not be used in subsequent
+ * functions.
+ *
+ * Note: This call is to be used only with the DNSServiceRef defined by this API.  It is
+ * not compatible with dns_service_discovery_ref objects defined in the legacy Mach-based
+ * DNSServiceDiscovery.h API.
+ *
+ * sdRef:           A DNSServiceRef initialized by any of the DNSService calls.
+ *
+ */
+
+void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdRef);
+
+
+/*********************************************************************************************
+ *
+ * Domain Enumeration
+ *
+ *********************************************************************************************/
+
+/* DNSServiceEnumerateDomains()
+ *
+ * Asynchronously enumerate domains available for browsing and registration.
+ *
+ * The enumeration MUST be cancelled via DNSServiceRefDeallocate() when no more domains
+ * are to be found.
+ *
+ * Note that the names returned are (like all of DNS-SD) UTF-8 strings,
+ * and are escaped using standard DNS escaping rules.
+ * (See "Notes on DNS Name Escaping" earlier in this file for more details.)
+ * A graphical browser displaying a hierarchical tree-structured view should cut
+ * the names at the bare dots to yield individual labels, then de-escape each
+ * label according to the escaping rules, and then display the resulting UTF-8 text.
+ *
+ * DNSServiceDomainEnumReply Callback Parameters:
+ *
+ * sdRef:           The DNSServiceRef initialized by DNSServiceEnumerateDomains().
+ *
+ * flags:           Possible values are:
+ *                  kDNSServiceFlagsMoreComing
+ *                  kDNSServiceFlagsAdd
+ *                  kDNSServiceFlagsDefault
+ *
+ * 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 kDNSServiceErr_NoError (0) on success, otherwise indicates
+ *                  the failure that occurred (other parameters are undefined if errorCode is nonzero).
+ *
+ * replyDomain:     The name of the domain.
+ *
+ * context:         The context pointer passed to DNSServiceEnumerateDomains.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceDomainEnumReply)
+    (
+    DNSServiceRef                       sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    DNSServiceErrorType                 errorCode,
+    const char                          *replyDomain,
+    void                                *context
+    );
+
+
+/* DNSServiceEnumerateDomains() Parameters:
+ *
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef. If the call succeeds 
+ *                  then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ *                  and the enumeration operation will run indefinitely until the client
+ *                  terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags:           Possible values are:
+ *                  kDNSServiceFlagsBrowseDomains to enumerate domains recommended for browsing.
+ *                  kDNSServiceFlagsRegistrationDomains 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. See "Constants for specifying an interface index" for more details.
+ *
+ * callBack:        The function to be called when a domain is found or the call asynchronously
+ *                  fails.
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is not invoked and the DNSServiceRef
+ *                  is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains
+    (
+    DNSServiceRef                       *sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    DNSServiceDomainEnumReply           callBack,
+    void                                *context  /* may be NULL */
+    );
+
+
+/*********************************************************************************************
+ *
+ *  Service Registration
+ *
+ *********************************************************************************************/
+
+/* Register a service that is discovered via Browse() and Resolve() calls.
+ *
+ *
+ * DNSServiceRegisterReply() Callback Parameters:
+ *
+ * sdRef:           The DNSServiceRef initialized by DNSServiceRegister().
+ *
+ * flags:           Currently unused, reserved for future use.
+ *
+ * errorCode:       Will be kDNSServiceErr_NoError on success, otherwise will
+ *                  indicate the failure that occurred (including name conflicts,
+ *                  if the kDNSServiceFlagsNoAutoRename flag was used when registering.)
+ *                  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 DNSServiceRegister(), this indicates the default domain
+ *                  on which the service was registered).
+ *
+ * context:         The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceRegisterReply)
+    (
+    DNSServiceRef                       sdRef,
+    DNSServiceFlags                     flags,
+    DNSServiceErrorType                 errorCode,
+    const char                          *name,
+    const char                          *regtype,
+    const char                          *domain,
+    void                                *context
+    );
+
+
+/* DNSServiceRegister()  Parameters:
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef. If the call succeeds 
+ *                  then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ *                  and the registration will remain active indefinitely until the client
+ *                  terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * 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. See "Constants for specifying an interface index" for more details.
+ *
+ * flags:           Indicates the renaming behavior on name conflict (most applications
+ *                  will pass 0).  See flag definitions above for details.
+ *
+ * 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).
+ *                  If a name is specified, it must be 1-63 bytes of UTF-8 text.
+ *                  If the name is longer than 63 bytes it will be automatically truncated
+ *                  to a legal length, unless the NoAutoRename flag is set,
+ *                  in which case kDNSServiceErr_BadParam will be returned.
+ *
+ * regtype:         The service type followed by the protocol, separated by a dot
+ *                  (e.g. "_ftp._tcp"). The service type must be an underscore, followed
+ *                  by 1-14 characters, which may be letters, digits, or hyphens.
+ *                  The transport protocol must be "_tcp" or "_udp". New service types
+ *                  should be registered at <http://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 network 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.
+ *
+ * txtLen:          The length of the txtRecord, in bytes.  Must be zero if the txtRecord is NULL.
+ *
+ * txtRecord:       The TXT record rdata. A non-NULL txtRecord MUST be a properly formatted DNS
+ *                  TXT record, i.e. <length byte> <data> <length byte> <data> ...
+ *                  Passing NULL for the txtRecord is allowed as a synonym for txtLen=1, txtRecord="",
+ *                  i.e. it creates a TXT record of length one containing a single empty string.
+ *                  RFC 1035 doesn't allow a TXT record to contain *zero* strings, so a single empty
+ *                  string is the smallest legal DNS TXT record.
+ *
+ * callBack:        The function 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().
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is never invoked and the DNSServiceRef
+ *                  is not initialized.)
+ *
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRegister
+    (
+    DNSServiceRef                       *sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    const char                          *name,         /* may be NULL */
+    const char                          *regtype,
+    const char                          *domain,       /* may be NULL */
+    const char                          *host,         /* may be NULL */
+    uint16_t                            port,
+    uint16_t                            txtLen,
+    const void                          *txtRecord,    /* may be NULL */
+    DNSServiceRegisterReply             callBack,      /* may be NULL */
+    void                                *context       /* may be NULL */
+    );
+
+
+/* DNSServiceAddRecord()
+ *
+ * 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 DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ *
+ *
+ * Parameters;
+ *
+ * sdRef:           A DNSServiceRef initialized by DNSServiceRegister().
+ *
+ * RecordRef:       A pointer to an uninitialized DNSRecordRef.  Upon succesfull completion of this
+ *                  call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ *                  If the above DNSServiceRef is passed to DNSServiceRefDeallocate(), 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. kDNSServiceType_TXT, kDNSServiceType_SRV, etc)
+ *
+ * rdlen:           The length, in bytes, of the rdata.
+ *
+ * rdata:           The raw rdata to be contained in the added resource record.
+ *
+ * ttl:             The time to live of the resource record, in seconds.  Pass 0 to use a default value.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success, otherwise returns an
+ *                  error code indicating the error that occurred (the RecordRef is not initialized).
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceAddRecord
+    (
+    DNSServiceRef                       sdRef,
+    DNSRecordRef                        *RecordRef,
+    DNSServiceFlags                     flags,
+    uint16_t                            rrtype,
+    uint16_t                            rdlen,
+    const void                          *rdata,
+    uint32_t                            ttl
+    );
+
+
+/* DNSServiceUpdateRecord
+ *
+ * Update a registered resource record.  The record must either be:
+ *   - The primary txt record of a service registered via DNSServiceRegister()
+ *   - A record added to a registered service via DNSServiceAddRecord()
+ *   - An individual record registered by DNSServiceRegisterRecord()
+ *
+ *
+ * Parameters:
+ *
+ * sdRef:           A DNSServiceRef that was initialized by DNSServiceRegister()
+ *                  or DNSServiceCreateConnection().
+ *
+ * RecordRef:       A DNSRecordRef initialized by DNSServiceAddRecord, or NULL to update the
+ *                  service's primary txt record.
+ *
+ * flags:           Currently ignored, reserved for future use.
+ *
+ * rdlen:           The length, in bytes, of the new rdata.
+ *
+ * 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:    Returns kDNSServiceErr_NoError on success, otherwise returns an
+ *                  error code indicating the error that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord
+    (
+    DNSServiceRef                       sdRef,
+    DNSRecordRef                        RecordRef,     /* may be NULL */
+    DNSServiceFlags                     flags,
+    uint16_t                            rdlen,
+    const void                          *rdata,
+    uint32_t                            ttl
+    );
+
+
+/* DNSServiceRemoveRecord
+ *
+ * Remove a record previously added to a service record set via DNSServiceAddRecord(), or deregister
+ * an record registered individually via DNSServiceRegisterRecord().
+ *
+ * Parameters:
+ *
+ * sdRef:           A DNSServiceRef initialized by DNSServiceRegister() (if the
+ *                  record being removed was registered via DNSServiceAddRecord()) or by
+ *                  DNSServiceCreateConnection() (if the record being removed was registered via
+ *                  DNSServiceRegisterRecord()).
+ *
+ * recordRef:       A DNSRecordRef initialized by a successful call to DNSServiceAddRecord()
+ *                  or DNSServiceRegisterRecord().
+ *
+ * flags:           Currently ignored, reserved for future use.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success, otherwise returns an
+ *                  error code indicating the error that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRemoveRecord
+    (
+    DNSServiceRef                 sdRef,
+    DNSRecordRef                  RecordRef,
+    DNSServiceFlags               flags
+    );
+
+
+/*********************************************************************************************
+ *
+ *  Service Discovery
+ *
+ *********************************************************************************************/
+
+/* Browse for instances of a service.
+ *
+ *
+ * DNSServiceBrowseReply() Parameters:
+ *
+ * sdRef:           The DNSServiceRef initialized by DNSServiceBrowse().
+ *
+ * flags:           Possible values are kDNSServiceFlagsMoreComing and kDNSServiceFlagsAdd.
+ *                  See flag definitions for details.
+ *
+ * interfaceIndex:  The interface on which the service is advertised.  This index should
+ *                  be passed to DNSServiceResolve() when resolving the service.
+ *
+ * errorCode:       Will be kDNSServiceErr_NoError (0) on success, otherwise will
+ *                  indicate the failure that occurred.  Other parameters are undefined if
+ *                  the errorCode is nonzero.
+ *
+ * serviceName:     The discovered service name. This name should be displayed to the user,
+ *                  and stored for subsequent use in the DNSServiceResolve() call.
+ *
+ * regtype:         The service type, which is usually (but not always) the same as was passed
+ *                  to DNSServiceBrowse(). One case where the discovered service type may
+ *                  not be the same as the requested service type is when using subtypes:
+ *                  The client may want to browse for only those ftp servers that allow
+ *                  anonymous connections. The client will pass the string "_ftp._tcp,_anon"
+ *                  to DNSServiceBrowse(), but the type of the service that's discovered
+ *                  is simply "_ftp._tcp". The regtype for each discovered service instance
+ *                  should be stored along with the name, so that it can be passed to
+ *                  DNSServiceResolve() when the service is later resolved.
+ *
+ * domain:          The domain of the discovered service instance. This may or may not be the
+ *                  same as the domain that was passed to DNSServiceBrowse(). The domain for each
+ *                  discovered service instance should be stored along with the name, so that
+ *                  it can be passed to DNSServiceResolve() when the service is later resolved.
+ *
+ * context:         The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceBrowseReply)
+    (
+    DNSServiceRef                       sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    DNSServiceErrorType                 errorCode,
+    const char                          *serviceName,
+    const char                          *regtype,
+    const char                          *replyDomain,
+    void                                *context
+    );
+
+
+/* DNSServiceBrowse() Parameters:
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef. If the call succeeds 
+ *                  then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ *                  and the browse operation will run indefinitely until the client
+ *                  terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * 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. See "Constants for specifying an interface index" for more details.
+ *
+ * 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 function to be called when an instance of the service being browsed for
+ *                  is found, or if the call asynchronously fails.
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is not invoked and the DNSServiceRef
+ *                  is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceBrowse
+    (
+    DNSServiceRef                       *sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    const char                          *regtype,
+    const char                          *domain,    /* may be NULL */
+    DNSServiceBrowseReply               callBack,
+    void                                *context    /* may be NULL */
+    );
+
+
+/* DNSServiceResolve()
+ *
+ * Resolve a service name discovered via DNSServiceBrowse() to a target host name, port number, and
+ * txt record.
+ *
+ * Note: Applications should NOT use DNSServiceResolve() solely for txt record monitoring - use
+ * DNSServiceQueryRecord() 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
+ * DNSServiceRefDeallocate().
+ *
+ * Note: DNSServiceResolve() behaves correctly for typical services that have a single SRV record
+ * and a single TXT record. To resolve non-standard services with multiple SRV or TXT records,
+ * DNSServiceQueryRecord() should be used.
+ *
+ * DNSServiceResolveReply Callback Parameters:
+ *
+ * sdRef:           The DNSServiceRef initialized by DNSServiceResolve().
+ *
+ * flags:           Currently unused, reserved for future use.
+ *
+ * interfaceIndex:  The interface on which the service was resolved.
+ *
+ * errorCode:       Will be kDNSServiceErr_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>.
+ *                  (This name is escaped following standard DNS rules, making it suitable for
+ *                  passing to standard system DNS APIs such as res_query(), or to the
+ *                  special-purpose functions included in this API that take fullname parameters.
+ *                  See "Notes on DNS Name Escaping" earlier in this file for more details.)
+ *
+ * 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 network byte order, on which connections are accepted for this service.
+ *
+ * txtLen:          The length of the txt record, in bytes.
+ *
+ * txtRecord:       The service's primary txt record, in standard txt record format.
+ *
+
+ * context:         The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceResolveReply)
+    (
+    DNSServiceRef                       sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    DNSServiceErrorType                 errorCode,
+    const char                          *fullname,
+    const char                          *hosttarget,
+    uint16_t                            port,
+    uint16_t                            txtLen,
+    const char                          *txtRecord,
+    void                                *context
+    );
+
+
+/* DNSServiceResolve() Parameters
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef. If the call succeeds 
+ *                  then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ *                  and the resolve operation will run indefinitely until the client
+ *                  terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags:           Currently ignored, reserved for future use.
+ *
+ * interfaceIndex:  The interface on which to resolve the service. If this resolve call is
+ *                  as a result of a currently active DNSServiceBrowse() operation, then the
+ *                  interfaceIndex should be the index reported in the DNSServiceBrowseReply
+ *                  callback. If this resolve call is using information previously saved
+ *                  (e.g. in a preference file) for later use, then use interfaceIndex 0, because
+ *                  the desired service may now be reachable via a different physical interface.
+ *                  See "Constants for specifying an interface index" for more details.
+ *
+ * name:            The name of the service instance to be resolved, as reported to the
+ *                  DNSServiceBrowseReply() callback.
+ *
+ * regtype:         The type of the service instance to be resolved, as reported to the
+ *                  DNSServiceBrowseReply() callback.
+ *
+ * domain:          The domain of the service instance to be resolved, as reported to the
+ *                  DNSServiceBrowseReply() callback.
+ *
+ * callBack:        The function to be called when a result is found, or if the call
+ *                  asynchronously fails.
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is never invoked and the DNSServiceRef
+ *                  is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceResolve
+    (
+    DNSServiceRef                       *sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    const char                          *name,
+    const char                          *regtype,
+    const char                          *domain,
+    DNSServiceResolveReply              callBack,
+    void                                *context  /* may be NULL */
+    );
+
+
+/*********************************************************************************************
+ *
+ *  Special Purpose Calls (most applications will not use these)
+ *
+ *********************************************************************************************/
+
+/* DNSServiceCreateConnection()
+ *
+ * Create a connection to the daemon allowing efficient registration of
+ * multiple individual records.
+ *
+ *
+ * Parameters:
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef.  Deallocating
+ *                  the reference (via DNSServiceRefDeallocate()) severs the
+ *                  connection and deregisters all records registered on this connection.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success, otherwise returns
+ *                  an error code indicating the specific failure that occurred (in which
+ *                  case the DNSServiceRef is not initialized).
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceCreateConnection(DNSServiceRef *sdRef);
+
+
+/* DNSServiceRegisterRecord
+ *
+ * Register an individual resource record on a connected DNSServiceRef.
+ *
+ * Note that name conflicts occurring for records registered via this call must be handled
+ * by the client in the callback.
+ *
+ *
+ * DNSServiceRegisterRecordReply() parameters:
+ *
+ * sdRef:           The connected DNSServiceRef initialized by
+ *                  DNSServiceDiscoveryConnect().
+ *
+ * RecordRef:       The DNSRecordRef initialized by DNSServiceRegisterRecord().  If the above
+ *                  DNSServiceRef is passed to DNSServiceRefDeallocate(), this DNSRecordRef is
+ *                  invalidated, and may not be used further.
+ *
+ * flags:           Currently unused, reserved for future use.
+ *
+ * errorCode:       Will be kDNSServiceErr_NoError on success, otherwise will
+ *                  indicate the failure that occurred (including name conflicts.)
+ *                  Other parameters are undefined if errorCode is nonzero.
+ *
+ * context:         The context pointer that was passed to the callout.
+ *
+ */
+
+ typedef void (DNSSD_API *DNSServiceRegisterRecordReply)
+    (
+    DNSServiceRef                       sdRef,
+    DNSRecordRef                        RecordRef,
+    DNSServiceFlags                     flags,
+    DNSServiceErrorType                 errorCode,
+    void                                *context
+    );
+
+
+/* DNSServiceRegisterRecord() Parameters:
+ *
+ * sdRef:           A DNSServiceRef initialized by DNSServiceCreateConnection().
+ *
+ * RecordRef:       A pointer to an uninitialized DNSRecordRef.  Upon succesfull completion of this
+ *                  call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ *                  (To deregister ALL records registered on a single connected DNSServiceRef
+ *                  and deallocate each of their corresponding DNSServiceRecordRefs, call
+ *                  DNSServiceRefDealloocate()).
+ *
+ * flags:           Possible values are kDNSServiceFlagsShared or kDNSServiceFlagsUnique
+ *                  (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.
+ *                  See "Constants for specifying an interface index" for more details.
+ *
+ * fullname:        The full domain name of the resource record.
+ *
+ * rrtype:          The numerical type of the resource record (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass:         The class of the resource record (usually kDNSServiceClass_IN)
+ *
+ * rdlen:           Length, in bytes, of the rdata.
+ *
+ * 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.  Pass 0 to use a default value.
+ *
+ * callBack:        The function to be called when a result is found, or if the call
+ *                  asynchronously fails (e.g. because of a name conflict.)
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is never invoked and the DNSRecordRef is
+ *                  not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRegisterRecord
+    (
+    DNSServiceRef                       sdRef,
+    DNSRecordRef                        *RecordRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    const char                          *fullname,
+    uint16_t                            rrtype,
+    uint16_t                            rrclass,
+    uint16_t                            rdlen,
+    const void                          *rdata,
+    uint32_t                            ttl,
+    DNSServiceRegisterRecordReply       callBack,
+    void                                *context    /* may be NULL */
+    );
+
+
+/* DNSServiceQueryRecord
+ *
+ * Query for an arbitrary DNS record.
+ *
+ *
+ * DNSServiceQueryRecordReply() Callback Parameters:
+ *
+ * sdRef:           The DNSServiceRef initialized by DNSServiceQueryRecord().
+ *
+ * flags:           Possible values are kDNSServiceFlagsMoreComing and
+ *                  kDNSServiceFlagsAdd.  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).
+ *                  See "Constants for specifying an interface index" for more details.
+ *
+ * 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. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass:         The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * rdlen:           The length, in bytes, of the resource record rdata.
+ *
+ * rdata:           The raw rdata of the resource record.
+ *
+ * ttl:             The resource record's time to live, in seconds.
+ *
+ * context:         The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceQueryRecordReply)
+    (
+    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
+    );
+
+
+/* DNSServiceQueryRecord() Parameters:
+ *
+ * sdRef:           A pointer to an uninitialized DNSServiceRef. If the call succeeds 
+ *                  then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ *                  and the query operation will run indefinitely until the client
+ *                  terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags:           Pass kDNSServiceFlagsLongLivedQuery 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. See "Constants for specifying an interface index" for more details.
+ *
+ * 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. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass:         The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * callBack:        The function to be called when a result is found, or if the call
+ *                  asynchronously fails.
+ *
+ * context:         An application context pointer which is passed to the callback function
+ *                  (may be NULL).
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ *                  errors are delivered to the callback), otherwise returns an error code indicating
+ *                  the error that occurred (the callback is never invoked and the DNSServiceRef
+ *                  is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceQueryRecord
+    (
+    DNSServiceRef                       *sdRef,
+    DNSServiceFlags                     flags,
+    uint32_t                            interfaceIndex,
+    const char                          *fullname,
+    uint16_t                            rrtype,
+    uint16_t                            rrclass,
+    DNSServiceQueryRecordReply          callBack,
+    void                                *context  /* may be NULL */
+    );
+
+
+/* DNSServiceReconfirmRecord
+ *
+ * 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.
+ *
+ * interfaceIndex:  If non-zero, specifies the interface of the record in question.
+ *                  Passing 0 causes all instances of this record to be reconfirmed.
+ *
+ * fullname:        The resource record's full domain name.
+ *
+ * rrtype:          The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass:         The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * rdlen:           The length, in bytes, of the resource record rdata.
+ *
+ * rdata:           The raw rdata of the resource record.
+ *
+ */
+
+void DNSSD_API DNSServiceReconfirmRecord
+    (
+    DNSServiceFlags                    flags,
+    uint32_t                           interfaceIndex,
+    const char                         *fullname,
+    uint16_t                           rrtype,
+    uint16_t                           rrclass,
+    uint16_t                           rdlen,
+    const void                         *rdata
+    );
+
+
+/*********************************************************************************************
+ *
+ *  General Utility Functions
+ *
+ *********************************************************************************************/
+
+/* DNSServiceConstructFullName()
+ *
+ * Concatenate a three-part domain name (as returned by the above callbacks) into a
+ * properly-escaped full domain name. Note that callbacks in the above functions ALREADY ESCAPE
+ * strings where necessary.
+ *
+ * Parameters:
+ *
+ * fullName:        A pointer to a buffer that where the resulting full domain name is to be written.
+ *                  The buffer must be kDNSServiceMaxDomainName (1005) bytes in length to
+ *                  accommodate the longest legal domain name without buffer overrun.
+ *
+ * service:         The service name - any dots or backslashes must NOT be escaped.
+ *                  May be NULL (to construct a PTR record name, e.g.
+ *                  "_ftp._tcp.apple.com.").
+ *
+ * regtype:         The service type followed by the protocol, separated by a dot
+ *                  (e.g. "_ftp._tcp").
+ *
+ * domain:          The domain name, e.g. "apple.com.".  Literal dots or backslashes,
+ *                  if any, must be escaped, e.g. "1st\. Floor.apple.com."
+ *
+ * return value:    Returns 0 on success, -1 on error.
+ *
+ */
+
+int DNSSD_API DNSServiceConstructFullName
+    (
+    char                            *fullName,
+    const char                      *service,      /* may be NULL */
+    const char                      *regtype,
+    const char                      *domain
+    );
+
+
+/*********************************************************************************************
+ *
+ *   TXT Record Construction Functions
+ *
+ *********************************************************************************************/
+
+/*
+ * A typical calling sequence for TXT record construction is something like:
+ *
+ * Client allocates storage for TXTRecord data (e.g. declare buffer on the stack)
+ * TXTRecordCreate();
+ * TXTRecordSetValue();
+ * TXTRecordSetValue();
+ * TXTRecordSetValue();
+ * ...
+ * DNSServiceRegister( ... TXTRecordGetLength(), TXTRecordGetBytesPtr() ... );
+ * TXTRecordDeallocate();
+ * Explicitly deallocate storage for TXTRecord data (if not allocated on the stack)
+ */
+
+
+/* TXTRecordRef
+ *
+ * Opaque internal data type.
+ * Note: Represents a DNS-SD TXT record.
+ */
+
+typedef struct _TXTRecordRef_t { char privatedata[16]; } TXTRecordRef;
+
+
+/* TXTRecordCreate()
+ *
+ * Creates a new empty TXTRecordRef referencing the specified storage.
+ *
+ * If the buffer parameter is NULL, or the specified storage size is not
+ * large enough to hold a key subsequently added using TXTRecordSetValue(),
+ * then additional memory will be added as needed using malloc().
+ *
+ * On some platforms, when memory is low, malloc() may fail. In this
+ * case, TXTRecordSetValue() will return kDNSServiceErr_NoMemory, and this
+ * error condition will need to be handled as appropriate by the caller.
+ *
+ * You can avoid the need to handle this error condition if you ensure
+ * that the storage you initially provide is large enough to hold all
+ * the key/value pairs that are to be added to the record.
+ * The caller can precompute the exact length required for all of the
+ * key/value pairs to be added, or simply provide a fixed-sized buffer
+ * known in advance to be large enough.
+ * A no-value (key-only) key requires  (1 + key length) bytes.
+ * A key with empty value requires     (1 + key length + 1) bytes.
+ * A key with non-empty value requires (1 + key length + 1 + value length).
+ * For most applications, DNS-SD TXT records are generally
+ * less than 100 bytes, so in most cases a simple fixed-sized
+ * 256-byte buffer will be more than sufficient.
+ * Recommended size limits for DNS-SD TXT Records are discussed in
+ * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
+ *
+ * Note: When passing parameters to and from these TXT record APIs,
+ * the key name does not include the '=' character. The '=' character
+ * is the separator between the key and value in the on-the-wire
+ * packet format; it is not part of either the key or the value.
+ *
+ * txtRecord:       A pointer to an uninitialized TXTRecordRef.
+ *
+ * bufferLen:       The size of the storage provided in the "buffer" parameter.
+ *
+ * buffer:          Optional caller-supplied storage used to hold the TXTRecord data.
+ *                  This storage must remain valid for as long as
+ *                  the TXTRecordRef.
+ */
+
+void DNSSD_API TXTRecordCreate
+    (
+    TXTRecordRef     *txtRecord,
+    uint16_t         bufferLen,
+    void             *buffer
+    );
+
+
+/* TXTRecordDeallocate()
+ *
+ * Releases any resources allocated in the course of preparing a TXT Record
+ * using TXTRecordCreate()/TXTRecordSetValue()/TXTRecordRemoveValue().
+ * Ownership of the buffer provided in TXTRecordCreate() returns to the client.
+ *
+ * txtRecord:           A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ */
+
+void DNSSD_API TXTRecordDeallocate
+    (
+    TXTRecordRef     *txtRecord
+    );
+
+
+/* TXTRecordSetValue()
+ *
+ * Adds a key (optionally with value) to a TXTRecordRef. If the "key" already
+ * exists in the TXTRecordRef, 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>
+ *
+ * txtRecord:       A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * key:             A null-terminated string which only contains printable ASCII
+ *                  values (0x20-0x7E), excluding '=' (0x3D). Keys should be
+ *                  8 characters or less (not counting the terminating null).
+ *
+ * valueSize:       The size of the value.
+ *
+ * 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.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success.
+ *                  Returns kDNSServiceErr_Invalid if the "key" string contains
+ *                  illegal characters.
+ *                  Returns kDNSServiceErr_NoMemory if adding this key would
+ *                  exceed the available storage.
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordSetValue
+    (
+    TXTRecordRef     *txtRecord,
+    const char       *key,
+    uint8_t          valueSize,        /* may be zero */
+    const void       *value            /* may be NULL */
+    );
+
+
+/* TXTRecordRemoveValue()
+ *
+ * Removes a key from a TXTRecordRef.  The "key" must be an
+ * ASCII string which exists in the TXTRecordRef.
+ *
+ * txtRecord:       A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * key:             A key name which exists in the TXTRecordRef.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success.
+ *                  Returns kDNSServiceErr_NoSuchKey if the "key" does not
+ *                  exist in the TXTRecordRef.
+ *
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordRemoveValue
+    (
+    TXTRecordRef     *txtRecord,
+    const char       *key
+    );
+
+
+/* TXTRecordGetLength()
+ *
+ * Allows you to determine the length of the raw bytes within a TXTRecordRef.
+ *
+ * txtRecord:       A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * return value:    Returns the size of the raw bytes inside a TXTRecordRef
+ *                  which you can pass directly to DNSServiceRegister() or
+ *                  to DNSServiceUpdateRecord().
+ *                  Returns 0 if the TXTRecordRef is empty.
+ *
+ */
+
+uint16_t DNSSD_API TXTRecordGetLength
+    (
+    const TXTRecordRef *txtRecord
+    );
+
+
+/* TXTRecordGetBytesPtr()
+ *
+ * Allows you to retrieve a pointer to the raw bytes within a TXTRecordRef.
+ *
+ * txtRecord:       A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * return value:    Returns a pointer to the raw bytes inside the TXTRecordRef
+ *                  which you can pass directly to DNSServiceRegister() or
+ *                  to DNSServiceUpdateRecord().
+ *
+ */
+
+const void * DNSSD_API TXTRecordGetBytesPtr
+    (
+    const TXTRecordRef *txtRecord
+    );
+
+
+/*********************************************************************************************
+ *
+ *   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 = TXTRecordGetValuePtr(txtLen, txtRecord, "key1", &len1);
+ * val2ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key2", &len2);
+ * ...
+ * bcopy(val1ptr, myval1, len1);
+ * bcopy(val2ptr, myval2, len2);
+ * ...
+ * return;
+ *
+ * If you wish to retain the values after return from the DNSServiceResolve()
+ * callback, then you need to copy the data to your own storage using bcopy()
+ * or similar, as shown in the example above.
+ *
+ * If for some reason you need to parse a TXT record you built yourself
+ * using the TXT record construction functions above, then you can do
+ * that using TXTRecordGetLength and TXTRecordGetBytesPtr calls:
+ * TXTRecordGetValue(TXTRecordGetLength(x), TXTRecordGetBytesPtr(x), key, &len);
+ *
+ * Most applications only fetch keys they know about from a TXT record and
+ * ignore the rest.
+ * However, some debugging tools wish to fetch and display all keys.
+ * To do that, use the TXTRecordGetCount() and TXTRecordGetItemAtIndex() calls.
+ */
+
+/* TXTRecordContainsKey()
+ *
+ * Allows you to determine if a given TXT Record contains a specified key.
+ *
+ * txtLen:          The size of the received TXT Record.
+ *
+ * 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.
+ *
+ */
+
+int DNSSD_API TXTRecordContainsKey
+    (
+    uint16_t         txtLen,
+    const void       *txtRecord,
+    const char       *key
+    );
+
+
+/* TXTRecordGetValuePtr()
+ *
+ * Allows you to retrieve the value for a given key from a TXT Record.
+ *
+ * txtLen:          The size of the received TXT Record
+ *
+ * txtRecord:       Pointer to the received TXT Record bytes.
+ *
+ * key:             A null-terminated ASCII string containing the key name.
+ *
+ * valueLen:        On output, will be set to the size of the "value" data.
+ *
+ * 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 TXTRecordContainsKey()).
+ *                  Returns pointer to location within TXT Record bytes
+ *                  if the key exists with empty or non-empty value.
+ *                  For empty value, valueLen will be zero.
+ *                  For non-empty value, valueLen will be length of value data.
+ */
+
+const void * DNSSD_API TXTRecordGetValuePtr
+    (
+    uint16_t         txtLen,
+    const void       *txtRecord,
+    const char       *key,
+    uint8_t          *valueLen
+    );
+
+
+/* TXTRecordGetCount()
+ *
+ * Returns the number of keys stored in the TXT Record.  The count
+ * can be used with TXTRecordGetItemAtIndex() to iterate through the keys.
+ *
+ * txtLen:          The size of the received TXT Record.
+ *
+ * txtRecord:       Pointer to the received TXT Record bytes.
+ *
+ * return value:    Returns the total number of keys in the TXT Record.
+ *
+ */
+
+uint16_t DNSSD_API TXTRecordGetCount
+    (
+    uint16_t         txtLen,
+    const void       *txtRecord
+    );
+
+
+/* TXTRecordGetItemAtIndex()
+ *
+ * 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.
+ *
+ * txtLen:          The size of the received TXT Record.
+ *
+ * txtRecord:       Pointer to the received TXT Record bytes.
+ *
+ * index:           An index into the TXT Record.
+ *
+ * keyBufLen:       The size of the string buffer being supplied.
+ *
+ * key:             A string buffer used to store the key name.
+ *                  On return, the buffer contains a null-terminated C string
+ *                  giving the key name. DNS-SD TXT keys are usually
+ *                  8 characters or less. To hold the maximum possible
+ *                  key name, the buffer should be 256 bytes long.
+ *
+ * valueLen:        On output, will be set to the size of the "value" data.
+ *
+ * value:           On output, *value is set to point to location within TXT
+ *                  Record bytes that holds the value data.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on success.
+ *                  Returns kDNSServiceErr_NoMemory if keyBufLen is too short.
+ *                  Returns kDNSServiceErr_Invalid if index is greater than
+ *                  TXTRecordGetCount()-1.
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordGetItemAtIndex
+    (
+    uint16_t         txtLen,
+    const void       *txtRecord,
+    uint16_t         index,
+    uint16_t         keyBufLen,
+    char             *key,
+    uint8_t          *valueLen,
+    const void       **value
+    );
+
+#ifdef __APPLE_API_PRIVATE
+
+/*
+ * Mac OS X specific functionality
+ * 3rd party clients of this API should not depend on future support or availability of this routine
+ */
+
+/* DNSServiceSetDefaultDomainForUser()
+ *
+ * Set the default domain for the caller's UID.  Future browse and registration
+ * calls by this user that do not specify an explicit domain will browse and
+ * register in this wide-area domain in addition to .local.  In addition, this
+ * domain will be returned as a Browse domain via domain enumeration calls.
+ * 
+ *
+ * Parameters:
+ *
+ * flags:           Pass kDNSServiceFlagsAdd to add a domain for a user.  Call without
+ *                  this flag set to clear a previously added domain.
+ *
+ * domain:          The domain to be used for the caller's UID.
+ *
+ * return value:    Returns kDNSServiceErr_NoError on succeses, otherwise returns
+ *                  an error code indicating the error that occurred
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceSetDefaultDomainForUser
+    (
+    DNSServiceFlags                    flags,
+    const char                         *domain
+    );	
+	
+#endif //__APPLE_API_PRIVATE
+
+#ifdef  __cplusplus
+    }
+#endif
+
+#endif  /* _DNS_SD_H */