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Constants and Data Types

This section describes the constants and data types used by the DNSServiceDiscovery API:

• DNSServiceDiscovery Flags and Errors

• Registration and Record Update

• Resolver

• Domain Enumeration

• Service Browser

DNSServiceDiscovery Flags and Errors

These flags and data types are used by most DNSServiceDiscovery functions and callbacks.

/* Opaque internal data type */
typedef struct _dns_service_discovery_t * dns_service_discovery_ref;
   
/* possible reply flags values */
enum {
   kDNSServiceDiscoveryNoFlags= 0,
   kDNSServiceDiscoveryMoreRepliesImmediately= 1 << 0,
};
// If the kDNSServiceDiscoveryMoreRepliesImmediately flag is set,
// do not update your UI
   
/* possible error code values */
typedef enum
{
kDNSServiceDiscoveryWaiting     = 1,
kDNSServiceDiscoveryNoError     = 0,
   
// mDNS Error codes are in the range
// FFFE FF00 (-65792) to FFFE FFFF (-65537)
kDNSServiceDiscoveryUnknownErr        = -65537,       // 0xFFFE FFFF
kDNSServiceDiscoveryNoSuchNameErr     = -65538,
kDNSServiceDiscoveryNoMemoryErr       = -65539,
kDNSServiceDiscoveryBadParamErr       = -65540,
kDNSServiceDiscoveryBadReferenceErr   = -65541,
kDNSServiceDiscoveryBadStateErr       = -65542,
kDNSServiceDiscoveryBadFlagsErr       = -65543,
kDNSServiceDiscoveryUnsupportedErr    = -65544,
kDNSServiceDiscoveryNotInitializedErr = -65545,
kDNSServiceDiscoveryNoCache           = -65546,
kDNSServiceDiscoveryAlreadyRegistered = -65547,
kDNSServiceDiscoveryNameConflict      = -65548,
kDNSServiceDiscoveryInvalid           = -65549,
kDNSServiceDiscoveryMemFree           = -65792        // 0xFFFE FF00
} DNSServiceRegistrationReplyErrorType;

Registration and Record Update

These types are used for DNS registration and update.

typedef void (*DNSServiceRegistrationReply) (
DNSServiceRegistrationReplyErrorType errorCode,
void *context
);
   
typedef uint32_t DNSRecordReference;

Resolver

These types and flags are used when resolving the IP address for a service.

typedef void (*DNSServiceResolverReply) (
   struct sockaddr *interface,
      // Host interface IP addr--needed if multiple LAN connections
      struct sockaddr *address,
         // Service link-local IP address, including port number
         const char *txtRecord,
         DNSServiceDiscoveryReplyFlags flags,
         void *context
      );

Domain Enumeration

These constants are used when determining the domain(s) in which you should search for or register a service

typedef enum
{
   DNSServiceDomainEnumerationReplyAddDomain, // Domain found
   DNSServiceDomainEnumerationReplyAddDomainDefault,
   // Domain found (and should be selected by default)
   DNSServiceDomainEnumerationReplyRemoveDomain,
   // Domain has been removed from network
} DNSServiceDomainEnumerationReplyResultType;
typedef enum
{
   DNSServiceDiscoverReplyFlagsFinished,
   DNSServiceDiscoverReplyFlagsMoreComing,
} DNSServiceDiscoveryReplyFlags;
typedef void (*DNSServiceDomainEnumerationReply) (
   DNSServiceDomainEnumerationReplyResultType resultType,
   const char *replyDomain,
   DNSServiceDiscoveryReplyFlags flags,
   void *context
);

Service Browser

These types and constants are used when browsing for services

typedef enum
{
   DNSServiceBrowserReplyAddInstance,
   // Instance of service found
   DNSServiceBrowserReplyRemoveInstance
   // Instance has been removed from network
} DNSServiceBrowserReplyResultType;
typedef void (*DNSServiceBrowserReply) (
   DNSServiceBrowserReplyResultType resultType, // Add or remove
   const char *replyName,
   const char *replyType,
   const char *replyDomain,
   DNSServiceDiscoveryReplyFlags flags,
   void *context
);

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