#ifndef __MDNSENBEDDE_API_H #define __MDNSENBEDDE_API_H #include "typedef.h" #include "mDNSDebug.h" #include "mDNSUNP.h" #ifndef mDNSlocal #define mDNSlocal static #endif #ifndef mDNSexport #define mDNSexport #endif typedef enum { // From RFC 1035 kDNSClass_IN = 1, // Internet kDNSClass_CS = 2, // CSNET kDNSClass_CH = 3, // CHAOS kDNSClass_HS = 4, // Hesiod kDNSClass_NONE = 254, // Used in DNS UPDATE [RFC 2136] kDNSClass_Mask = 0x7FFF,// Multicast DNS uses the bottom 15 bits to identify the record class... kDNSClass_UniqueRRSet = 0x8000,// ... and the top bit indicates that all other cached records are now invalid kDNSQClass_ANY = 255, // Not a DNS class, but a DNS query class, meaning "all classes" kDNSQClass_UnicastResponse = 0x8000 // Top bit set in a question means "unicast response acceptable" } DNS_ClassValues; typedef enum { // From RFC 1035 kDNSType_A = 1, // 1 Address kDNSType_NS, // 2 Name Server kDNSType_MD, // 3 Mail Destination kDNSType_MF, // 4 Mail Forwarder kDNSType_CNAME, // 5 Canonical Name kDNSType_SOA, // 6 Start of Authority kDNSType_MB, // 7 Mailbox kDNSType_MG, // 8 Mail Group kDNSType_MR, // 9 Mail Rename kDNSType_NULL, // 10 NULL RR kDNSType_WKS, // 11 Well-known-service kDNSType_PTR, // 12 Domain name pointer kDNSType_HINFO, // 13 Host information kDNSType_MINFO, // 14 Mailbox information kDNSType_MX, // 15 Mail Exchanger kDNSType_TXT, // 16 Arbitrary text string kDNSType_RP, // 17 Responsible person kDNSType_AFSDB, // 18 AFS cell database kDNSType_X25, // 19 X_25 calling address kDNSType_ISDN, // 20 ISDN calling address kDNSType_RT, // 21 Router kDNSType_NSAP, // 22 NSAP address kDNSType_NSAP_PTR, // 23 Reverse NSAP lookup (deprecated) kDNSType_SIG, // 24 Security signature kDNSType_KEY, // 25 Security key kDNSType_PX, // 26 X.400 mail mapping kDNSType_GPOS, // 27 Geographical position (withdrawn) kDNSType_AAAA, // 28 IPv6 Address kDNSType_LOC, // 29 Location Information kDNSType_NXT, // 30 Next domain (security) kDNSType_EID, // 31 Endpoint identifier kDNSType_NIMLOC, // 32 Nimrod Locator kDNSType_SRV, // 33 Service record kDNSType_ATMA, // 34 ATM Address kDNSType_NAPTR, // 35 Naming Authority PoinTeR kDNSType_KX, // 36 Key Exchange kDNSType_CERT, // 37 Certification record kDNSType_A6, // 38 IPv6 Address (deprecated) kDNSType_DNAME, // 39 Non-terminal DNAME (for IPv6) kDNSType_SINK, // 40 Kitchen sink (experimental) kDNSType_OPT, // 41 EDNS0 option (meta-RR) kDNSType_APL, // 42 Address Prefix List kDNSType_DS, // 43 Delegation Signer kDNSType_SSHFP, // 44 SSH Key Fingerprint kDNSType_IPSECKEY, // 45 IPSECKEY kDNSType_RRSIG, // 46 RRSIG kDNSType_NSEC, // 47 Denial of Existence kDNSType_DNSKEY, // 48 DNSKEY kDNSType_DHCID, // 49 DHCP Client Identifier kDNSType_NSEC3, // 50 Hashed Authenticated Denial of Existence kDNSType_NSEC3PARAM, // 51 Hashed Authenticated Denial of Existence kDNSType_HIP = 55, // 55 Host Identity Protocol kDNSType_SPF = 99, // 99 Sender Policy Framework for E-Mail kDNSType_UINFO, // 100 IANA-Reserved kDNSType_UID, // 101 IANA-Reserved kDNSType_GID, // 102 IANA-Reserved kDNSType_UNSPEC, // 103 IANA-Reserved kDNSType_TKEY = 249, // 249 Transaction key kDNSType_TSIG, // 250 Transaction signature kDNSType_IXFR, // 251 Incremental zone transfer kDNSType_AXFR, // 252 Transfer zone of authority kDNSType_MAILB, // 253 Transfer mailbox records kDNSType_MAILA, // 254 Transfer mail agent records kDNSQType_ANY // Not a DNS type, but a DNS query type, meaning "all types" } DNS_TypeValues; // mDNS defines its own names for these common types to simplify portability across // multiple platforms that may each have their own (different) names for these types. typedef int mDNSBool; typedef signed char mDNSs8; typedef unsigned char mDNSu8; typedef signed short mDNSs16; typedef unsigned short mDNSu16; typedef signed int mDNSs32; typedef unsigned int mDNSu32; // To enforce useful type checking, we make mDNSInterfaceID be a pointer to a dummy struct // This way, mDNSInterfaceIDs can be assigned, and compared with each other, but not with other types // Declaring the type to be the typical generic "void *" would lack this type checking typedef struct mDNSInterfaceID_dummystruct { void *dummy; } *mDNSInterfaceID; typedef union { mDNSu8 b[ 2]; mDNSu16 NotAnInteger; } mDNSOpaque16; typedef union { mDNSu8 b[ 4]; mDNSu32 NotAnInteger; } mDNSOpaque32; typedef packedunion { mDNSu8 b[ 6]; mDNSu16 w[3]; mDNSu32 l[1]; } mDNSOpaque48; typedef union { mDNSu8 b[ 8]; mDNSu16 w[4]; mDNSu32 l[2]; } mDNSOpaque64; typedef union { mDNSu8 b[16]; mDNSu16 w[8]; mDNSu32 l[4]; } mDNSOpaque128; typedef mDNSOpaque16 mDNSIPPort; // An IP port is a two-byte opaque identifier (not an integer) typedef mDNSOpaque32 mDNSv4Addr; // An IP address is a four-byte opaque identifier (not an integer) typedef mDNSOpaque128 mDNSv6Addr; // An IPv6 address is a 16-byte opaque identifier (not an integer) typedef mDNSOpaque48 mDNSEthAddr; // An Ethernet address is a six-byte opaque identifier (not an integer) // Bit operations for opaque 64 bit quantity. Uses the 32 bit quantity(l[2]) to set and clear bits #define mDNSNBBY 8 #define bit_set_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] |= (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) #define bit_clr_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] &= ~(1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) #define bit_get_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] & (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY)))) enum { mDNSAddrType_None = 0, mDNSAddrType_IPv4 = 4, mDNSAddrType_IPv6 = 6, mDNSAddrType_Unknown = ~0 // Special marker value used in known answer list recording }; enum { mDNSTransport_None = 0, mDNSTransport_UDP = 1, mDNSTransport_TCP = 2 }; typedef struct { mDNSs32 type; union { mDNSv6Addr v6; mDNSv4Addr v4; } ip; } mDNSAddr; enum { mDNSfalse = 0, mDNStrue = 1 }; #define mDNSNULL 0L enum { mStatus_Waiting = 1, mStatus_NoError = 0, // mDNS return values are in the range FFFE FF00 (-65792) to FFFE FFFF (-65537) // The top end of the range (FFFE FFFF) is used for error codes; // the bottom end of the range (FFFE FF00) is used for non-error values; // Error codes: mStatus_UnknownErr = -65537, // First value: 0xFFFE FFFF mStatus_NoSuchNameErr = -65538, mStatus_NoMemoryErr = -65539, mStatus_BadParamErr = -65540, mStatus_BadReferenceErr = -65541, mStatus_BadStateErr = -65542, mStatus_BadFlagsErr = -65543, mStatus_UnsupportedErr = -65544, mStatus_NotInitializedErr = -65545, mStatus_NoCache = -65546, mStatus_AlreadyRegistered = -65547, mStatus_NameConflict = -65548, mStatus_Invalid = -65549, mStatus_Firewall = -65550, mStatus_Incompatible = -65551, mStatus_BadInterfaceErr = -65552, mStatus_Refused = -65553, mStatus_NoSuchRecord = -65554, mStatus_NoAuth = -65555, mStatus_NoSuchKey = -65556, mStatus_NATTraversal = -65557, mStatus_DoubleNAT = -65558, mStatus_BadTime = -65559, mStatus_BadSig = -65560, // while we define this per RFC 2845, BIND 9 returns Refused for bad/missing signatures mStatus_BadKey = -65561, mStatus_TransientErr = -65562, // transient failures, e.g. sending packets shortly after a network transition or wake from sleep mStatus_ServiceNotRunning = -65563, // Background daemon not running mStatus_NATPortMappingUnsupported = -65564, // NAT doesn't support NAT-PMP or UPnP mStatus_NATPortMappingDisabled = -65565, // NAT supports NAT-PMP or UPnP but it's disabled by the administrator mStatus_NoRouter = -65566, mStatus_PollingMode = -65567, mStatus_Timeout = -65568, // -65568 to -65786 currently unused; available for allocation // tcp connection status mStatus_ConnPending = -65787, mStatus_ConnFailed = -65788, mStatus_ConnEstablished = -65789, // Non-error values: mStatus_GrowCache = -65790, mStatus_ConfigChanged = -65791, mStatus_MemFree = -65792 // Last value: 0xFFFE FF00 // mStatus_MemFree is the last legal mDNS error code, at the end of the range allocated for mDNS }; typedef mDNSs32 mStatus; // RFC 1034/1035 specify that a domain label consists of a length byte plus up to 63 characters #define MAX_DOMAIN_LABEL 63 typedef struct { mDNSu8 c[ 64]; } domainlabel; // One label: length byte and up to 63 characters // RFC 1034/1035/2181 specify that a domain name (length bytes and data bytes) may be up to 255 bytes long, // plus the terminating zero at the end makes 256 bytes total in the on-the-wire format. #define MAX_DOMAIN_NAME 256 typedef struct { mDNSu8 c[256]; } domainname; // Up to 256 bytes of length-prefixed domainlabels typedef struct { mDNSu8 c[256]; } UTF8str255; // Null-terminated C string // The longest legal textual form of a DNS name is 1009 bytes, including the C-string terminating NULL at the end. // Explanation: // When a native domainname object is converted to printable textual form using ConvertDomainNameToCString(), // non-printing characters are represented in the conventional DNS way, as '\ddd', where ddd is a three-digit decimal number. // The longest legal domain name is 256 bytes, in the form of four labels as shown below: // Length byte, 63 data bytes, length byte, 63 data bytes, length byte, 63 data bytes, length byte, 62 data bytes, zero byte. // Each label is encoded textually as characters followed by a trailing dot. // If every character has to be represented as a four-byte escape sequence, then this makes the maximum textual form four labels // plus the C-string terminating NULL as shown below: // 63*4+1 + 63*4+1 + 63*4+1 + 62*4+1 + 1 = 1009. // Note that MAX_ESCAPED_DOMAIN_LABEL is not normally used: If you're only decoding a single label, escaping is usually not required. // It is for domain names, where dots are used as label separators, that proper escaping is vital. #define MAX_ESCAPED_DOMAIN_LABEL 254 #define MAX_ESCAPED_DOMAIN_NAME 1009 // MAX_REVERSE_MAPPING_NAME // For IPv4: "123.123.123.123.in-addr.arpa." 30 bytes including terminating NUL // For IPv6: "x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.ip6.arpa." 74 bytes including terminating NUL #define MAX_REVERSE_MAPPING_NAME_V4 30 #define MAX_REVERSE_MAPPING_NAME_V6 74 #define MAX_REVERSE_MAPPING_NAME 74 // Most records have a TTL of 75 minutes, so that their 80% cache-renewal query occurs once per hour. // For records containing a hostname (in the name on the left, or in the rdata on the right), // like A, AAAA, reverse-mapping PTR, and SRV, we use a two-minute TTL by default, because we don't want // them to hang around for too long in the cache if the host in question crashes or otherwise goes away. #define kStandardTTL (3600UL * 100 / 80) #define kHostNameTTL 120UL // Some applications want to register their SRV records with a lower ttl so that in case the server // using a dynamic port number restarts, the clients will not have stale information for more than // 10 seconds #define kHostNameSmallTTL 10UL // Multicast DNS uses announcements (gratuitous responses) to update peer caches. // This means it is feasible to use relatively larger TTL values than we might otherwise // use, because we have a cache coherency protocol to keep the peer caches up to date. // With Unicast DNS, once an authoritative server gives a record with a certain TTL value to a client // or caching server, that client or caching server is entitled to hold onto the record until its TTL // expires, and has no obligation to contact the authoritative server again until that time arrives. // This means that whereas Multicast DNS can use announcements to pre-emptively update stale data // before it would otherwise have expired, standard Unicast DNS (not using LLQs) has no equivalent // mechanism, and TTL expiry is the *only* mechanism by which stale data gets deleted. Because of this, // we currently limit the TTL to ten seconds in such cases where no dynamic cache updating is possible. #define kStaticCacheTTL 10 #define DefaultTTLforRRType(X) (((X) == kDNSType_A || (X) == kDNSType_AAAA || (X) == kDNSType_SRV) ? kHostNameTTL : kStandardTTL) typedef struct AuthRecord_struct AuthRecord; typedef struct ServiceRecordSet_struct ServiceRecordSet; typedef struct CacheRecord_struct CacheRecord; typedef struct CacheGroup_struct CacheGroup; typedef struct AuthGroup_struct AuthGroup; typedef struct DNSQuestion_struct DNSQuestion; typedef struct ZoneData_struct ZoneData; typedef struct mDNS_struct mDNS; typedef struct mDNS_PlatformSupport_struct mDNS_PlatformSupport; typedef struct NATTraversalInfo_struct NATTraversalInfo; // Structure to abstract away the differences between TCP/SSL sockets, and one for UDP sockets // The actual definition of these structures appear in the appropriate platform support code typedef struct TCPSocket_struct TCPSocket; typedef struct UDPSocket_struct UDPSocket; //mDNSOpaque16 // *************************************************************************** #define mDNS_numZones numQuestions #define mDNS_numPrereqs numAnswers #define mDNS_numUpdates numAuthorities typedef packedstruct { mDNSOpaque16 id; mDNSOpaque16 flags; mDNSu16 numQuestions; mDNSu16 numAnswers; mDNSu16 numAuthorities; mDNSu16 numAdditionals; } DNSMessageHeader; // We can send and receive packets up to 9000 bytes (Ethernet Jumbo Frame size, if that ever becomes widely used) // However, in the normal case we try to limit packets to 1500 bytes so that we don't get IP fragmentation on standard Ethernet // 40 (IPv6 header) + 8 (UDP header) + 12 (DNS message header) + 1440 (DNS message body) = 1500 total #define AbsoluteMaxDNSMessageData 8940 #define NormalMaxDNSMessageData 1440 typedef packedstruct { DNSMessageHeader h; // Note: Size 12 bytes mDNSu8 data[AbsoluteMaxDNSMessageData]; // 40 (IPv6) + 8 (UDP) + 12 (DNS header) + 8940 (data) = 9000 } DNSMessage; typedef struct tcpInfo_t { mDNS *m; TCPSocket *sock; DNSMessage request; int requestLen; DNSQuestion *question; // For queries AuthRecord *rr; // For record updates mDNSAddr Addr; mDNSIPPort Port; mDNSIPPort SrcPort; DNSMessage *reply; mDNSu16 replylen; unsigned long nread; int numReplies; } tcpInfo_t; // *************************************************************************** typedef packedstruct { mDNSEthAddr dst; mDNSEthAddr src; mDNSOpaque16 ethertype; } EthernetHeader; // 14 bytes typedef packedstruct { mDNSOpaque16 hrd; mDNSOpaque16 pro; mDNSu8 hln; mDNSu8 pln; mDNSOpaque16 op; mDNSEthAddr sha; mDNSv4Addr spa; mDNSEthAddr tha; mDNSv4Addr tpa; } ARP_EthIP; // 28 bytes typedef packedstruct { mDNSu8 vlen; mDNSu8 tos; mDNSu16 totlen; mDNSOpaque16 id; mDNSOpaque16 flagsfrags; mDNSu8 ttl; mDNSu8 protocol; // Payload type: 0x06 = TCP, 0x11 = UDP mDNSu16 checksum; mDNSv4Addr src; mDNSv4Addr dst; } IPv4Header; // 20 bytes typedef packedstruct { mDNSu32 vcf; // Version, Traffic Class, Flow Label mDNSu16 len; // Payload Length mDNSu8 pro; // Type of next header: 0x06 = TCP, 0x11 = UDP, 0x3A = ICMPv6 mDNSu8 ttl; // Hop Limit mDNSv6Addr src; mDNSv6Addr dst; } IPv6Header; // 40 bytes typedef packedstruct { mDNSv6Addr src; mDNSv6Addr dst; mDNSOpaque32 len; mDNSOpaque32 pro; } IPv6PseudoHeader; // 40 bytes typedef union { mDNSu8 bytes[20]; ARP_EthIP arp; IPv4Header v4; IPv6Header v6; } NetworkLayerPacket; typedef packedstruct { mDNSIPPort src; mDNSIPPort dst; mDNSu32 seq; mDNSu32 ack; mDNSu8 offset; mDNSu8 flags; mDNSu16 window; mDNSu16 checksum; mDNSu16 urgent; } TCPHeader; // 20 bytes; IP protocol type 0x06 typedef packedstruct { mDNSIPPort src; mDNSIPPort dst; mDNSu16 len; // Length including UDP header (i.e. minimum value is 8 bytes) mDNSu16 checksum; } UDPHeader; // 8 bytes; IP protocol type 0x11 typedef packedstruct { mDNSu8 type; // 0x87 == Neighbor Solicitation, 0x88 == Neighbor Advertisement mDNSu8 code; mDNSu16 checksum; mDNSu32 flags_res; // R/S/O flags and reserved bits mDNSv6Addr target; // Typically 8 bytes of options are also present } IPv6NDP; // 24 bytes or more; IP protocol type 0x3A #define NDP_Sol 0x87 #define NDP_Adv 0x88 #define NDP_Router 0x80 #define NDP_Solicited 0x40 #define NDP_Override 0x20 #define NDP_SrcLL 1 #define NDP_TgtLL 2 typedef union { mDNSu8 bytes[20]; TCPHeader tcp; UDPHeader udp; IPv6NDP ndp; } TransportLayerPacket; typedef packedstruct { mDNSOpaque64 InitiatorCookie; mDNSOpaque64 ResponderCookie; mDNSu8 NextPayload; mDNSu8 Version; mDNSu8 ExchangeType; mDNSu8 Flags; mDNSOpaque32 MessageID; mDNSu32 Length; } IKEHeader; // 28 bytes enum { kDNSRecordTypeUnregistered = 0x00, // Not currently in any list kDNSRecordTypeDeregistering = 0x01, // Shared record about to announce its departure and leave the list kDNSRecordTypeUnique = 0x02, // Will become a kDNSRecordTypeVerified when probing is complete kDNSRecordTypeAdvisory = 0x04, // Like Shared, but no goodbye packet kDNSRecordTypeShared = 0x08, // Shared means record name does not have to be unique -- use random delay on responses kDNSRecordTypeVerified = 0x10, // Unique means mDNS should check that name is unique (and then send immediate responses) kDNSRecordTypeKnownUnique = 0x20, // Known Unique means mDNS can assume name is unique without checking // For Dynamic Update records, Known Unique means the record must already exist on the server. kDNSRecordTypeUniqueMask = (kDNSRecordTypeUnique | kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique), kDNSRecordTypeActiveSharedMask = (kDNSRecordTypeAdvisory | kDNSRecordTypeShared), kDNSRecordTypeActiveUniqueMask = (kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique), kDNSRecordTypeActiveMask = (kDNSRecordTypeActiveSharedMask | kDNSRecordTypeActiveUniqueMask), kDNSRecordTypePacketAdd = 0x80, // Received in the Additional Section of a DNS Response kDNSRecordTypePacketAddUnique = 0x90, // Received in the Additional Section of a DNS Response with kDNSClass_UniqueRRSet set kDNSRecordTypePacketAuth = 0xA0, // Received in the Authorities Section of a DNS Response kDNSRecordTypePacketAuthUnique = 0xB0, // Received in the Authorities Section of a DNS Response with kDNSClass_UniqueRRSet set kDNSRecordTypePacketAns = 0xC0, // Received in the Answer Section of a DNS Response kDNSRecordTypePacketAnsUnique = 0xD0, // Received in the Answer Section of a DNS Response with kDNSClass_UniqueRRSet set kDNSRecordTypePacketNegative = 0xF0, // Pseudo-RR generated to cache non-existence results like NXDomain kDNSRecordTypePacketUniqueMask = 0x10 // True for PacketAddUnique, PacketAnsUnique, PacketAuthUnique, kDNSRecordTypePacketNegative }; typedef packedstruct { mDNSu16 priority; mDNSu16 weight; mDNSIPPort port; domainname target; } rdataSRV; typedef packedstruct { mDNSu16 preference; domainname exchange; } rdataMX; typedef packedstruct { domainname mbox; domainname txt; } rdataRP; typedef packedstruct { mDNSu16 preference; domainname map822; domainname mapx400; } rdataPX; typedef packedstruct { domainname mname; domainname rname; mDNSs32 serial; // Modular counter; increases when zone changes mDNSu32 refresh; // Time in seconds that a slave waits after successful replication of the database before it attempts replication again mDNSu32 retry; // Time in seconds that a slave waits after an unsuccessful replication attempt before it attempts replication again mDNSu32 expire; // Time in seconds that a slave holds on to old data while replication attempts remain unsuccessful mDNSu32 min; // Nominally the minimum record TTL for this zone, in seconds; also used for negative caching. } rdataSOA; #define kDNSOpt_LLQ 1 #define kDNSOpt_Lease 2 #define kDNSOpt_NSID 3 #define kDNSOpt_Owner 4 typedef struct { mDNSu16 vers; mDNSu16 llqOp; mDNSu16 err; // Or UDP reply port, in setup request // Note: In the in-memory form, there's typically a two-byte space here, so that the following 64-bit id is word-aligned mDNSOpaque64 id; mDNSu32 llqlease; } LLQOptData; typedef struct { mDNSu8 vers; // Version number of this Owner OPT record mDNSs8 seq; // Sleep/wake epoch mDNSEthAddr HMAC; // Host's primary identifier (e.g. MAC of on-board Ethernet) mDNSEthAddr IMAC; // Interface's MAC address (if different to primary MAC) mDNSOpaque48 password; // Optional password } OwnerOptData; // Note: rdataOPT format may be repeated an arbitrary number of times in a single resource record typedef packedstruct { mDNSu16 opt; mDNSu16 optlen; union { LLQOptData llq; mDNSu32 updatelease; OwnerOptData owner; } u; } rdataOPT; // Space needed to put OPT records into a packet: // Header 11 bytes (name 1, type 2, class 2, TTL 4, length 2) // LLQ rdata 18 bytes (opt 2, len 2, vers 2, op 2, err 2, id 8, lease 4) // Lease rdata 8 bytes (opt 2, len 2, lease 4) // Owner rdata 12-24 (opt 2, len 2, owner 8-20) #define DNSOpt_Header_Space 11 #define DNSOpt_LLQData_Space (4 + 2 + 2 + 2 + 8 + 4) #define DNSOpt_LeaseData_Space (4 + 4) #define DNSOpt_OwnerData_ID_Space (4 + 2 + 6) #define DNSOpt_OwnerData_ID_Wake_Space (4 + 2 + 6 + 6) #define DNSOpt_OwnerData_ID_Wake_PW4_Space (4 + 2 + 6 + 6 + 4) #define DNSOpt_OwnerData_ID_Wake_PW6_Space (4 + 2 + 6 + 6 + 6) #define ValidOwnerLength(X) ( (X) == DNSOpt_OwnerData_ID_Space - 4 || \ (X) == DNSOpt_OwnerData_ID_Wake_Space - 4 || \ (X) == DNSOpt_OwnerData_ID_Wake_PW4_Space - 4 || \ (X) == DNSOpt_OwnerData_ID_Wake_PW6_Space - 4 ) #define DNSOpt_Owner_Space(A,B) (mDNSSameEthAddress((A),(B)) ? DNSOpt_OwnerData_ID_Space : DNSOpt_OwnerData_ID_Wake_Space) #define DNSOpt_Data_Space(O) ( \ (O)->opt == kDNSOpt_LLQ ? DNSOpt_LLQData_Space : \ (O)->opt == kDNSOpt_Lease ? DNSOpt_LeaseData_Space : \ (O)->opt == kDNSOpt_Owner ? DNSOpt_Owner_Space(&(O)->u.owner.HMAC, &(O)->u.owner.IMAC) : 0x10000) // A maximal NSEC record is: // 256 bytes domainname 'nextname' // + 256 * 34 = 8704 bytes of bitmap data // = 8960 bytes total // For now we only support NSEC records encoding DNS types 0-255 and ignore the nextname (we always set it to be the same as the rrname), // which gives us a fixed in-memory size of 32 bytes (256 bits) typedef struct { mDNSu8 bitmap[32]; } rdataNSEC; // StandardAuthRDSize is 264 (256+8), which is large enough to hold a maximum-sized SRV record (6 + 256 bytes) // MaximumRDSize is 8K the absolute maximum we support (at least for now) #define StandardAuthRDSize 264 #define MaximumRDSize 8192 // InlineCacheRDSize is 68 // Records received from the network with rdata this size or less have their rdata stored right in the CacheRecord object // Records received from the network with rdata larger than this have additional storage allocated for the rdata // A quick unscientific sample from a busy network at Apple with lots of machines revealed this: // 1461 records in cache // 292 were one-byte TXT records // 136 were four-byte A records // 184 were sixteen-byte AAAA records // 780 were various PTR, TXT and SRV records from 12-64 bytes // Only 69 records had rdata bigger than 64 bytes // Note that since CacheRecord object and a CacheGroup object are allocated out of the same pool, it's sensible to // have them both be the same size. Making one smaller without making the other smaller won't actually save any memory. #define InlineCacheRDSize 68 // On 64-bit, the pointers in a CacheRecord are bigger, and that creates 8 bytes more space for the name in a CacheGroup #if ENABLE_MULTI_PACKET_QUERY_SNOOPING #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64) #define InlineCacheGroupNameSize 160 #else #define InlineCacheGroupNameSize 148 #endif #else #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64) #define InlineCacheGroupNameSize 144 #else #define InlineCacheGroupNameSize 132 #endif #endif // The RDataBody union defines the common rdata types that fit into our 264-byte limit typedef union { mDNSu8 data[StandardAuthRDSize]; mDNSv4Addr ipv4; // For 'A' record domainname name; // For PTR, NS, CNAME, DNAME UTF8str255 txt; rdataMX mx; mDNSv6Addr ipv6; // For 'AAAA' record rdataSRV srv; rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together rdataNSEC nsec; } RDataBody; // The RDataBody2 union is the same as above, except it includes fields for the larger types like soa, rp, px typedef union { mDNSu8 data[StandardAuthRDSize]; mDNSv4Addr ipv4; // For 'A' record domainname name; // For PTR, NS, CNAME, DNAME rdataSOA soa; // This is large; not included in the normal RDataBody definition UTF8str255 txt; rdataMX mx; rdataRP rp; // This is large; not included in the normal RDataBody definition rdataPX px; // This is large; not included in the normal RDataBody definition mDNSv6Addr ipv6; // For 'AAAA' record rdataSRV srv; rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together rdataNSEC nsec; } RDataBody2; typedef struct { mDNSu16 MaxRDLength; // Amount of storage allocated for rdata (usually sizeof(RDataBody)) mDNSu16 padding; // So that RDataBody is aligned on 32-bit boundary RDataBody u; } RData; // sizeofRDataHeader should be 4 bytes #define sizeofRDataHeader (sizeof(RData) - sizeof(RDataBody)) // RData_small is a smaller version of the RData object, used for inline data storage embedded in a CacheRecord_struct typedef struct { mDNSu16 MaxRDLength; // Storage allocated for data (may be greater than InlineCacheRDSize if additional storage follows this object) mDNSu16 padding; // So that data is aligned on 32-bit boundary mDNSu8 data[InlineCacheRDSize]; } RData_small; // Note: Within an mDNSRecordCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() typedef void mDNSRecordCallback(mDNS *const m, AuthRecord *const rr, mStatus result); // Note: // Restrictions: An mDNSRecordUpdateCallback may not make any mDNS API calls. // The intent of this callback is to allow the client to free memory, if necessary. // The internal data structures of the mDNS code may not be in a state where mDNS API calls may be made safely. typedef void mDNSRecordUpdateCallback(mDNS *const m, AuthRecord *const rr, RData *OldRData, mDNSu16 OldRDLen); // *************************************************************************** #define NATMAP_MAX_RETRY_INTERVAL ((mDNSPlatformOneSecond * 60) * 15) // Max retry interval is 15 minutes #define NATMAP_MIN_RETRY_INTERVAL (mDNSPlatformOneSecond * 2) // Min retry interval is 2 seconds #define NATMAP_INIT_RETRY (mDNSPlatformOneSecond / 4) // start at 250ms w/ exponential decay #define NATMAP_DEFAULT_LEASE (60 * 60 * 2) // 2 hour lease life in seconds #define NATMAP_VERS 0 typedef enum { NATOp_AddrRequest = 0, NATOp_MapUDP = 1, NATOp_MapTCP = 2, NATOp_AddrResponse = 0x80 | 0, NATOp_MapUDPResponse = 0x80 | 1, NATOp_MapTCPResponse = 0x80 | 2, } NATOp_t; enum { NATErr_None = 0, NATErr_Vers = 1, NATErr_Refused = 2, NATErr_NetFail = 3, NATErr_Res = 4, NATErr_Opcode = 5 }; typedef mDNSu16 NATErr_t; typedef packedstruct { mDNSu8 vers; mDNSu8 opcode; } NATAddrRequest; typedef packedstruct { mDNSu8 vers; mDNSu8 opcode; mDNSu16 err; mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds mDNSv4Addr ExtAddr; } NATAddrReply; typedef packedstruct { mDNSu8 vers; mDNSu8 opcode; mDNSOpaque16 unused; mDNSIPPort intport; mDNSIPPort extport; mDNSu32 NATReq_lease; } NATPortMapRequest; typedef packedstruct { mDNSu8 vers; mDNSu8 opcode; mDNSu16 err; mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds mDNSIPPort intport; mDNSIPPort extport; mDNSu32 NATRep_lease; } NATPortMapReply; typedef enum { LNTDiscoveryOp = 1, LNTExternalAddrOp = 2, LNTPortMapOp = 3, LNTPortMapDeleteOp = 4 } LNTOp_t; #define LNT_MAXBUFSIZE 8192 typedef struct tcpLNTInfo_struct tcpLNTInfo; struct tcpLNTInfo_struct { tcpLNTInfo *next; mDNS *m; NATTraversalInfo *parentNATInfo; // pointer back to the parent NATTraversalInfo TCPSocket *sock; LNTOp_t op; // operation performed using this connection mDNSAddr Address; // router address mDNSIPPort Port; // router port mDNSu8 *Request; // xml request to router int requestLen; mDNSu8 *Reply; // xml reply from router int replyLen; unsigned long nread; // number of bytes read so far int retries; // number of times we've tried to do this port mapping }; typedef void (*NATTraversalClientCallback)(mDNS *m, NATTraversalInfo *n); // if m->timenow < ExpiryTime then we have an active mapping, and we'll renew halfway to expiry // if m->timenow >= ExpiryTime then our mapping has expired, and we're trying to create one struct NATTraversalInfo_struct { // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. NATTraversalInfo *next; mDNSs32 ExpiryTime; // Time this mapping expires, or zero if no mapping mDNSs32 retryInterval; // Current interval, between last packet we sent and the next one mDNSs32 retryPortMap; // If Protocol is nonzero, time to send our next mapping packet mStatus NewResult; // New error code; will be copied to Result just prior to invoking callback #ifdef _LEGACY_NAT_TRAVERSAL_ tcpLNTInfo tcpInfo; // Legacy NAT traversal (UPnP) TCP connection #endif // Result fields: When the callback is invoked these fields contain the answers the client is looking for // When the callback is invoked ExternalPort is *usually* set to be the same the same as RequestedPort, except: // (a) When we're behind a NAT gateway with port mapping disabled, ExternalPort is reported as zero to // indicate that we don't currently have a working mapping (but RequestedPort retains the external port // we'd like to get, the next time we meet an accomodating NAT gateway willing to give us one). // (b) When we have a routable non-RFC1918 address, we don't *need* a port mapping, so ExternalPort // is reported as the same as our InternalPort, since that is effectively our externally-visible port too. // Again, RequestedPort retains the external port we'd like to get the next time we find ourself behind a NAT gateway. // To improve stability of port mappings, RequestedPort is updated any time we get a successful // mapping response from the NAT-PMP or UPnP gateway. For example, if we ask for port 80, and // get assigned port 81, then thereafter we'll contine asking for port 81. mDNSInterfaceID InterfaceID; mDNSv4Addr ExternalAddress; // Initially set to onesIPv4Addr, until first callback mDNSIPPort ExternalPort; mDNSu32 Lifetime; mStatus Result; // Client API fields: The client must set up these fields *before* making any NAT traversal API calls mDNSu8 Protocol; // NATOp_MapUDP or NATOp_MapTCP, or zero if just requesting the external IP address mDNSIPPort IntPort; // Client's internal port number (doesn't change) mDNSIPPort RequestedPort; // Requested external port; may be updated with actual value assigned by gateway mDNSu32 NATLease; // Requested lifetime in seconds (doesn't change) NATTraversalClientCallback clientCallback; void *clientContext; }; enum { DNSServer_Untested = 0, DNSServer_Passed = 1, DNSServer_Failed = 2, DNSServer_Disabled = 3 }; enum { DNSServer_FlagDelete = 1, DNSServer_FlagNew = 2 }; enum { McastResolver_FlagDelete = 1, McastResolver_FlagNew = 2 }; typedef struct McastResolver { struct McastResolver *next; mDNSInterfaceID interface; mDNSu32 flags; // Set when we're planning to delete this from the list domainname domain; mDNSu32 timeout; // timeout value for questions } McastResolver; typedef struct DNSServer { struct DNSServer *next; mDNSInterfaceID interface; // For specialized uses; we can have DNS servers reachable over specific interfaces mDNSAddr addr; mDNSIPPort port; mDNSOpaque16 testid; mDNSu32 flags; // Set when we're planning to delete this from the list mDNSu32 teststate; // Have we sent bug-detection query to this server? mDNSs32 lasttest; // Time we sent last bug-detection query to this server domainname domain; // name->server matching for "split dns" mDNSs32 penaltyTime; // amount of time this server is penalized mDNSBool scoped; // interface should be matched against question only // if scoped is set mDNSu32 timeout; // timeout value for questions mDNSBool cellIntf; // Resolver from Cellular Interface ? } DNSServer; typedef struct { // Size is 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit mDNSu8 RecordType; // See enum above mDNSu16 rrtype; mDNSu16 rrclass; mDNSu32 rroriginalttl; // In seconds mDNSu16 rdlength; // Size of the raw rdata, in bytes, in the on-the-wire format // (In-memory storage may be larger, for structures containing 'holes', like SOA, // or smaller, for NSEC where we don't bother storing the nextname field) mDNSu16 rdestimate; // Upper bound on on-the-wire size of rdata after name compression mDNSu32 namehash; // Name-based (i.e. case-insensitive) hash of name mDNSu32 rdatahash; // For rdata containing domain name (e.g. PTR, SRV, CNAME etc.), case-insensitive name hash // else, for all other rdata, 32-bit hash of the raw rdata // Note: This requirement is important. Various routines like AddAdditionalsToResponseList(), // ReconfirmAntecedents(), etc., use rdatahash as a pre-flight check to see // whether it's worth doing a full SameDomainName() call. If the rdatahash // is not a correct case-insensitive name hash, they'll get false negatives. // Grouping pointers together at the end of the structure improves the memory layout efficiency mDNSInterfaceID InterfaceID; // Set if this RR is specific to one interface // For records received off the wire, InterfaceID is *always* set to the receiving interface // For our authoritative records, InterfaceID is usually zero, except for those few records // that are interface-specific (e.g. address records, especially linklocal addresses) const domainname *name; RData *rdata; // Pointer to storage for this rdata DNSServer *rDNSServer; // Unicast DNS server authoritative for this entry;null for multicast } ResourceRecord; // Unless otherwise noted, states may apply to either independent record registrations or service registrations typedef enum { regState_Zero = 0, regState_Pending = 1, // update sent, reply not received regState_Registered = 2, // update sent, reply received regState_DeregPending = 3, // dereg sent, reply not received regState_Unregistered = 4, // not in any list regState_Refresh = 5, // outstanding refresh (or target change) message regState_NATMap = 6, // establishing NAT port mapping regState_UpdatePending = 7, // update in flight as result of mDNS_Update call regState_NoTarget = 8, // SRV Record registration pending registration of hostname regState_NATError = 9 // unable to complete NAT traversal } regState_t; enum { Target_Manual = 0, Target_AutoHost = 1, Target_AutoHostAndNATMAP = 2 }; typedef enum { mergeState_Zero = 0, mergeState_DontMerge = 1 // Set on fatal error conditions to disable merging } mergeState_t; struct AuthGroup_struct { // Header object for a list of AuthRecords with the same name AuthGroup *next; // Next AuthGroup object in this hash table bucket mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name AuthRecord *members; // List of CacheRecords with this same name AuthRecord **rrauth_tail; // Tail end of that list domainname *name; // Common name for all AuthRecords in this list AuthRecord *NewLocalOnlyRecords; // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit mDNSu8 namestorage[InlineCacheGroupNameSize]; }; #define AUTH_HASH_SLOTS 499 #define FORALL_AUTHRECORDS(SLOT,AG,AR) \ for ((SLOT) = 0; (SLOT) < AUTH_HASH_SLOTS; (SLOT)++) \ for ((AG)=m->rrauth.rrauth_hash[(SLOT)]; (AG); (AG)=(AG)->next) \ for ((AR) = (AG)->members; (AR); (AR)=(AR)->next) typedef union AuthEntity_union AuthEntity; union AuthEntity_union { AuthEntity *next; AuthGroup ag; }; typedef struct { mDNSu32 rrauth_size; // Total number of available auth entries mDNSu32 rrauth_totalused; // Number of auth entries currently occupied mDNSu32 rrauth_report; mDNSu8 rrauth_lock; // For debugging: Set at times when these lists may not be modified AuthEntity *rrauth_free; AuthGroup *rrauth_hash[AUTH_HASH_SLOTS]; } AuthHash; // AuthRecordAny includes mDNSInterface_Any and interface specific auth records (anything // other than P2P or LocalOnly) typedef enum { AuthRecordAny, // registered for *Any, NOT including P2P interfaces AuthRecordAnyIncludeP2P, // registered for *Any, including P2P interfaces AuthRecordLocalOnly, AuthRecordP2P // discovered over D2D/P2P framework } AuthRecType; struct AuthRecord_struct { // For examples of how to set up this structure for use in mDNS_Register(), // see mDNS_AdvertiseInterface() or mDNS_RegisterService(). // Basically, resrec and persistent metadata need to be set up before calling mDNS_Register(). // mDNS_SetupResourceRecord() is avaliable as a helper routine to set up most fields to sensible default values for you AuthRecord *next; // Next in list; first element of structure for efficiency reasons // Field Group 1: Common ResourceRecord fields ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit // Field Group 2: Persistent metadata for Authoritative Records AuthRecord *Additional1; // Recommended additional record to include in response (e.g. SRV for PTR record) AuthRecord *Additional2; // Another additional (e.g. TXT for PTR record) AuthRecord *DependentOn; // This record depends on another for its uniqueness checking AuthRecord *RRSet; // This unique record is part of an RRSet mDNSRecordCallback *RecordCallback; // Callback function to call for state changes, and to free memory asynchronously on deregistration void *RecordContext; // Context parameter for the callback function mDNSu8 AutoTarget; // Set if the target of this record (PTR, CNAME, SRV, etc.) is our host name mDNSu8 AllowRemoteQuery; // Set if we allow hosts not on the local link to query this record mDNSu8 ForceMCast; // Set by client to advertise solely via multicast, even for apparently unicast names OwnerOptData WakeUp; // WakeUp.HMAC.l[0] nonzero indicates that this is a Sleep Proxy record mDNSAddr AddressProxy; // For reverse-mapping Sleep Proxy PTR records, address in question mDNSs32 TimeRcvd; // In platform time units mDNSs32 TimeExpire; // In platform time units AuthRecType ARType; // LocalOnly, P2P or Normal ? // Field Group 3: Transient state for Authoritative Records mDNSu8 Acknowledged; // Set if we've given the success callback to the client mDNSu8 ProbeCount; // Number of probes remaining before this record is valid (kDNSRecordTypeUnique) mDNSu8 AnnounceCount; // Number of announcements remaining (kDNSRecordTypeShared) mDNSu8 RequireGoodbye; // Set if this RR has been announced on the wire and will require a goodbye packet mDNSu8 AnsweredLocalQ; // Set if this AuthRecord has been delivered to any local question (LocalOnly or mDNSInterface_Any) mDNSu8 IncludeInProbe; // Set if this RR is being put into a probe right now mDNSu8 ImmedUnicast; // Set if we may send our response directly via unicast to the requester mDNSInterfaceID SendNSECNow; // Set if we need to generate associated NSEC data for this rrname mDNSInterfaceID ImmedAnswer; // Someone on this interface issued a query we need to answer (all-ones for all interfaces) #if MDNS_LOG_ANSWER_SUPPRESSION_TIMES mDNSs32 ImmedAnswerMarkTime; #endif mDNSInterfaceID ImmedAdditional; // Hint that we might want to also send this record, just to be helpful mDNSInterfaceID SendRNow; // The interface this query is being sent on right now mDNSv4Addr v4Requester; // Recent v4 query for this record, or all-ones if more than one recent query mDNSv6Addr v6Requester; // Recent v6 query for this record, or all-ones if more than one recent query AuthRecord *NextResponse; // Link to the next element in the chain of responses to generate const mDNSu8 *NR_AnswerTo; // Set if this record was selected by virtue of being a direct answer to a question AuthRecord *NR_AdditionalTo; // Set if this record was selected by virtue of being additional to another mDNSs32 ThisAPInterval; // In platform time units: Current interval for announce/probe mDNSs32 LastAPTime; // In platform time units: Last time we sent announcement/probe mDNSs32 LastMCTime; // Last time we multicast this record (used to guard against packet-storm attacks) mDNSInterfaceID LastMCInterface; // Interface this record was multicast on at the time LastMCTime was recorded RData *NewRData; // Set if we are updating this record with new rdata mDNSu16 newrdlength; // ... and the length of the new RData mDNSRecordUpdateCallback *UpdateCallback; mDNSu32 UpdateCredits; // Token-bucket rate limiting of excessive updates mDNSs32 NextUpdateCredit; // Time next token is added to bucket mDNSs32 UpdateBlocked; // Set if update delaying is in effect // Field Group 4: Transient uDNS state for Authoritative Records regState_t state; // Maybe combine this with resrec.RecordType state? Right now it's ambiguous and confusing. // e.g. rr->resrec.RecordType can be kDNSRecordTypeUnregistered, // and rr->state can be regState_Unregistered // What if we find one of those statements is true and the other false? What does that mean? mDNSBool uselease; // dynamic update contains (should contain) lease option mDNSs32 expire; // In platform time units: expiration of lease (-1 for static) mDNSBool Private; // If zone is private, DNS updates may have to be encrypted to prevent eavesdropping mDNSOpaque16 updateid; // Identifier to match update request and response -- also used when transferring records to Sleep Proxy const domainname *zone; // the zone that is updated ZoneData *nta; struct tcpInfo_t *tcp; NATTraversalInfo NATinfo; mDNSBool SRVChanged; // temporarily deregistered service because its SRV target or port changed mergeState_t mState; // Unicast Record Registrations merge state mDNSu8 refreshCount; // Number of refreshes to the server mStatus updateError; // Record update resulted in Error ? // uDNS_UpdateRecord support fields // Do we really need all these in *addition* to NewRData and newrdlength above? void *UpdateContext; // Context parameter for the update callback function mDNSu16 OrigRDLen; // previously registered, being deleted mDNSu16 InFlightRDLen; // currently being registered mDNSu16 QueuedRDLen; // pending operation (re-transmitting if necessary) THEN register the queued update RData *OrigRData; RData *InFlightRData; RData *QueuedRData; // Field Group 5: Large data objects go at the end domainname namestorage; RData rdatastorage; // Normally the storage is right here, except for oversized records // rdatastorage MUST be the last thing in the structure -- when using oversized AuthRecords, extra bytes // are appended after the end of the AuthRecord, logically augmenting the size of the rdatastorage // DO NOT ADD ANY MORE FIELDS HERE }; // IsLocalDomain alone is not sufficient to determine that a record is mDNS or uDNS. By default domain names within // the "local" pseudo-TLD (and within the IPv4 and IPv6 link-local reverse mapping domains) are automatically treated // as mDNS records, but it is also possible to force any record (even those not within one of the inherently local // domains) to be handled as an mDNS record by setting the ForceMCast flag, or by setting a non-zero InterfaceID. // For example, the reverse-mapping PTR record created in AdvertiseInterface sets the ForceMCast flag, since it points to // a dot-local hostname, and therefore it would make no sense to register this record with a wide-area Unicast DNS server. // The same applies to Sleep Proxy records, which we will answer for when queried via mDNS, but we never want to try // to register them with a wide-area Unicast DNS server -- and we probably don't have the required credentials anyway. // Currently we have no concept of a wide-area uDNS record scoped to a particular interface, so if the InterfaceID is // nonzero we treat this the same as ForceMCast. // Note: Question_uDNS(Q) is used in *only* one place -- on entry to mDNS_StartQuery_internal, to decide whether to set TargetQID. // Everywhere else in the code, the determination of whether a question is unicast is made by checking to see if TargetQID is nonzero. #define AuthRecord_uDNS(R) ((R)->resrec.InterfaceID == mDNSInterface_Any && !(R)->ForceMCast && !IsLocalDomain((R)->resrec.name)) #define Question_uDNS(Q) ((Q)->InterfaceID == mDNSInterface_Unicast || \ ((Q)->InterfaceID != mDNSInterface_LocalOnly && (Q)->InterfaceID != mDNSInterface_P2P && !(Q)->ForceMCast && !IsLocalDomain(&(Q)->qname))) #define RRLocalOnly(rr) ((rr)->ARType == AuthRecordLocalOnly || (rr)->ARType == AuthRecordP2P) #define RRAny(rr) ((rr)->ARType == AuthRecordAny || (rr)->ARType == AuthRecordAnyIncludeP2P) // Question (A or AAAA) that is suppressed currently because IPv4 or IPv6 address // is not available locally for A or AAAA question respectively #define QuerySuppressed(Q) ((Q)->SuppressUnusable && (Q)->SuppressQuery) #define PrivateQuery(Q) ((Q)->AuthInfo && (Q)->AuthInfo->AutoTunnel) // Normally we always lookup the cache and /etc/hosts before sending the query on the wire. For single label // queries (A and AAAA) that are unqualified (indicated by AppendSearchDomains), we want to append search // domains before we try them as such #define ApplySearchDomainsFirst(q) ((q)->AppendSearchDomains && (CountLabels(&((q)->qname))) == 1) // Wrapper struct for Auth Records for higher-level code that cannot use the AuthRecord's ->next pointer field typedef struct ARListElem { struct ARListElem *next; AuthRecord ar; // Note: Must be last element of structure, to accomodate oversized AuthRecords } ARListElem; struct CacheGroup_struct { // Header object for a list of CacheRecords with the same name CacheGroup *next; // Next CacheGroup object in this hash table bucket mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name CacheRecord *members; // List of CacheRecords with this same name CacheRecord **rrcache_tail; // Tail end of that list domainname *name; // Common name for all CacheRecords in this list // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit mDNSu8 namestorage[InlineCacheGroupNameSize]; }; struct CacheRecord_struct { CacheRecord *next; // Next in list; first element of structure for efficiency reasons ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit // Transient state for Cache Records CacheRecord *NextInKAList; // Link to the next element in the chain of known answers to send mDNSs32 TimeRcvd; // In platform time units mDNSs32 DelayDelivery; // Set if we want to defer delivery of this answer to local clients mDNSs32 NextRequiredQuery; // In platform time units mDNSs32 LastUsed; // In platform time units DNSQuestion *CRActiveQuestion; // Points to an active question referencing this answer. Can never point to a NewQuestion. mDNSu32 UnansweredQueries; // Number of times we've issued a query for this record without getting an answer mDNSs32 LastUnansweredTime; // In platform time units; last time we incremented UnansweredQueries #if ENABLE_MULTI_PACKET_QUERY_SNOOPING mDNSu32 MPUnansweredQ; // Multi-packet query handling: Number of times we've seen a query for this record mDNSs32 MPLastUnansweredQT; // Multi-packet query handling: Last time we incremented MPUnansweredQ mDNSu32 MPUnansweredKA; // Multi-packet query handling: Number of times we've seen this record in a KA list mDNSBool MPExpectingKA; // Multi-packet query handling: Set when we increment MPUnansweredQ; allows one KA #endif CacheRecord *NextInCFList; // Set if this is in the list of records we just received with the cache flush bit set // Size to here is 76 bytes when compiling 32-bit; 104 bytes when compiling 64-bit RData_small smallrdatastorage; // Storage for small records is right here (4 bytes header + 68 bytes data = 72 bytes) }; // Storage sufficient to hold either a CacheGroup header or a CacheRecord // -- for best efficiency (to avoid wasted unused storage) they should be the same size typedef union CacheEntity_union CacheEntity; union CacheEntity_union { CacheEntity *next; CacheGroup cg; CacheRecord cr; }; typedef struct { CacheRecord r; mDNSu8 _extradata[MaximumRDSize - InlineCacheRDSize]; // Glue on the necessary number of extra bytes domainname namestorage; // Needs to go *after* the extra rdata bytes } LargeCacheRecord; typedef struct HostnameInfo { struct HostnameInfo *next; NATTraversalInfo natinfo; domainname fqdn; AuthRecord arv4; // registered IPv4 address record AuthRecord arv6; // registered IPv6 address record mDNSRecordCallback *StatusCallback; // callback to deliver success or error code to client layer const void *StatusContext; // Client Context } HostnameInfo; typedef struct ExtraResourceRecord_struct ExtraResourceRecord; struct ExtraResourceRecord_struct { ExtraResourceRecord *next; mDNSu32 ClientID; // Opaque ID field to be used by client to map an AddRecord call to a set of Extra records AuthRecord r; // Note: Add any additional fields *before* the AuthRecord in this structure, not at the end. // In some cases clients can allocate larger chunks of memory and set r->rdata->MaxRDLength to indicate // that this extra memory is available, which would result in any fields after the AuthRecord getting smashed }; // Note: Within an mDNSServiceCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() typedef void mDNSServiceCallback(mDNS *const m, ServiceRecordSet *const sr, mStatus result); // A ServiceRecordSet has no special meaning to the core code of the Multicast DNS protocol engine; // it is just a convenience structure to group together the records that make up a standard service // registration so that they can be allocted and deallocted together as a single memory object. // It contains its own ServiceCallback+ServiceContext to report aggregate results up to the next layer of software above. // It also contains: // * the basic PTR/SRV/TXT triplet used to represent any DNS-SD service // * the "_services" PTR record for service enumeration // * the optional list of SubType PTR records // * the optional list of additional records attached to the service set (e.g. iChat pictures) struct ServiceRecordSet_struct { // These internal state fields are used internally by mDNSCore; the client layer needn't be concerned with them. // No fields need to be set up by the client prior to calling mDNS_RegisterService(); // all required data is passed as parameters to that function. mDNSServiceCallback *ServiceCallback; void *ServiceContext; mDNSBool Conflict; // Set if this record set was forcibly deregistered because of a conflict ExtraResourceRecord *Extras; // Optional list of extra AuthRecords attached to this service registration mDNSu32 NumSubTypes; AuthRecord *SubTypes; AuthRecord RR_ADV; // e.g. _services._dns-sd._udp.local. PTR _printer._tcp.local. AuthRecord RR_PTR; // e.g. _printer._tcp.local. PTR Name._printer._tcp.local. AuthRecord RR_SRV; // e.g. Name._printer._tcp.local. SRV 0 0 port target AuthRecord RR_TXT; // e.g. Name._printer._tcp.local. TXT PrintQueueName // Don't add any fields after AuthRecord RR_TXT. // This is where the implicit extra space goes if we allocate a ServiceRecordSet containing an oversized RR_TXT record }; // *************************************************************************** // We record the last eight instances of each duplicate query // This gives us v4/v6 on each of Ethernet, AirPort and Firewire, and two free slots "for future expansion" // If the host has more active interfaces that this it is not fatal -- duplicate question suppression will degrade gracefully. // Since we will still remember the last eight, the busiest interfaces will still get the effective duplicate question suppression. #define DupSuppressInfoSize 8 typedef struct { mDNSs32 Time; mDNSInterfaceID InterfaceID; mDNSs32 Type; // v4 or v6? } DupSuppressInfo; typedef enum { LLQ_InitialRequest = 1, LLQ_SecondaryRequest = 2, LLQ_Established = 3, LLQ_Poll = 4 } LLQ_State; // LLQ constants #define kLLQ_Vers 1 #define kLLQ_DefLease 7200 // 2 hours #define kLLQ_MAX_TRIES 3 // retry an operation 3 times max #define kLLQ_INIT_RESEND 2 // resend an un-ack'd packet after 2 seconds, then double for each additional // LLQ Operation Codes #define kLLQOp_Setup 1 #define kLLQOp_Refresh 2 #define kLLQOp_Event 3 // LLQ Errror Codes enum { LLQErr_NoError = 0, LLQErr_ServFull = 1, LLQErr_Static = 2, LLQErr_FormErr = 3, LLQErr_NoSuchLLQ = 4, LLQErr_BadVers = 5, LLQErr_UnknownErr = 6 }; enum { NoAnswer_Normal = 0, NoAnswer_Suspended = 1, NoAnswer_Fail = 2 }; #define HMAC_LEN 64 #define HMAC_IPAD 0x36 #define HMAC_OPAD 0x5c #define MD5_LEN 16 #define AutoTunnelUnregistered(X) ( \ (X)->AutoTunnelHostRecord.resrec.RecordType == kDNSRecordTypeUnregistered && \ (X)->AutoTunnelDeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered && \ (X)->AutoTunnelService. resrec.RecordType == kDNSRecordTypeUnregistered && \ (X)->AutoTunnel6Record. resrec.RecordType == kDNSRecordTypeUnregistered ) // Internal data structure to maintain authentication information typedef struct DomainAuthInfo { struct DomainAuthInfo *next; mDNSs32 deltime; // If we're planning to delete this DomainAuthInfo, the time we want it deleted const char *AutoTunnel; // If NULL, this is not an AutoTunnel DAI. Otherwise, this is prepended to the IPSec identifier AuthRecord AutoTunnelHostRecord; // User-visible hostname; used as SRV target for AutoTunnel services AuthRecord AutoTunnelTarget; // Opaque hostname of tunnel endpoint; used as SRV target for AutoTunnelService record AuthRecord AutoTunnelDeviceInfo; // Device info of tunnel endpoint AuthRecord AutoTunnelService; // Service record (possibly NAT-Mapped) of IKE daemon implementing tunnel endpoint AuthRecord AutoTunnel6Record; // AutoTunnel AAAA Record obtained from Connectivityd NATTraversalInfo AutoTunnelNAT; domainname domain; domainname keyname; domainname hostname; mDNSIPPort port; char b64keydata[32]; mDNSu8 keydata_ipad[HMAC_LEN]; // padded key for inner hash rounds mDNSu8 keydata_opad[HMAC_LEN]; // padded key for outer hash rounds } DomainAuthInfo; // Note: Within an mDNSQuestionCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() typedef enum { QC_rmv = 0, QC_add = 1, QC_addnocache = 2 } QC_result; typedef void mDNSQuestionCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord); #define NextQSendTime(Q) ((Q)->LastQTime + (Q)->ThisQInterval) #define ActiveQuestion(Q) ((Q)->ThisQInterval > 0 && !(Q)->DuplicateOf) #define TimeToSendThisQuestion(Q,time) (ActiveQuestion(Q) && (time) - NextQSendTime(Q) >= 0) struct DNSQuestion_struct { // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. DNSQuestion *next; mDNSu32 qnamehash; mDNSs32 DelayAnswering; // Set if we want to defer answering this question until the cache settles mDNSs32 LastQTime; // Last scheduled transmission of this Q on *all* applicable interfaces mDNSs32 ThisQInterval; // LastQTime + ThisQInterval is the next scheduled transmission of this Q // ThisQInterval > 0 for an active question; // ThisQInterval = 0 for a suspended question that's still in the list // ThisQInterval = -1 for a cancelled question (should not still be in list) mDNSs32 ExpectUnicastResp;// Set when we send a query with the kDNSQClass_UnicastResponse bit set mDNSs32 LastAnswerPktNum; // The sequence number of the last response packet containing an answer to this Q mDNSu32 RecentAnswerPkts; // Number of answers since the last time we sent this query mDNSu32 CurrentAnswers; // Number of records currently in the cache that answer this question mDNSu32 LargeAnswers; // Number of answers with rdata > 1024 bytes mDNSu32 UniqueAnswers; // Number of answers received with kDNSClass_UniqueRRSet bit set mDNSInterfaceID FlappingInterface1;// Set when an interface goes away, to flag if remove events are delivered for this Q mDNSInterfaceID FlappingInterface2;// Set when an interface goes away, to flag if remove events are delivered for this Q DomainAuthInfo *AuthInfo; // Non-NULL if query is currently being done using Private DNS DNSQuestion *DuplicateOf; DNSQuestion *NextInDQList; DupSuppressInfo DupSuppress[DupSuppressInfoSize]; mDNSInterfaceID SendQNow; // The interface this query is being sent on right now mDNSBool SendOnAll; // Set if we're sending this question on all active interfaces mDNSu32 RequestUnicast; // Non-zero if we want to send query with kDNSQClass_UnicastResponse bit set mDNSs32 LastQTxTime; // Last time this Q was sent on one (but not necessarily all) interfaces mDNSu32 CNAMEReferrals; // Count of how many CNAME redirections we've done mDNSBool SuppressQuery; // This query should be suppressed and not sent on the wire mDNSu8 LOAddressAnswers; // Number of answers from the local only auth records that are // answering A, AAAA and CNAME (/etc/hosts) mDNSu8 WakeOnResolveCount; // Number of wakes that should be sent on resolve mDNSs32 StopTime; // Time this question should be stopped by giving them a negative answer // Wide Area fields. These are used internally by the uDNS core UDPSocket *LocalSocket; mDNSBool deliverAddEvents; // Change in DNSSserver requiring to deliver ADD events DNSServer *qDNSServer; // Caching server for this query (in the absence of an SRV saying otherwise) mDNSOpaque64 validDNSServers; // Valid DNSServers for this question mDNSu16 noServerResponse; // At least one server did not respond. mDNSu16 triedAllServersOnce; // Tried all DNS servers once mDNSu8 unansweredQueries;// The number of unanswered queries to this server ZoneData *nta; // Used for getting zone data for private or LLQ query mDNSAddr servAddr; // Address and port learned from _dns-llq, _dns-llq-tls or _dns-query-tls SRV query mDNSIPPort servPort; struct tcpInfo_t *tcp; mDNSIPPort tcpSrcPort; // Local Port TCP packet received on;need this as tcp struct is disposed // by tcpCallback before calling into mDNSCoreReceive mDNSu8 NoAnswer; // Set if we want to suppress answers until tunnel setup has completed // LLQ-specific fields. These fields are only meaningful when LongLived flag is set LLQ_State state; mDNSu32 ReqLease; // seconds (relative) mDNSs32 expire; // ticks (absolute) mDNSs16 ntries; // for UDP: the number of packets sent for this LLQ state // for TCP: there is some ambiguity in the use of this variable, but in general, it is // the number of TCP/TLS connection attempts for this LLQ state, or // the number of packets sent for this TCP/TLS connection mDNSOpaque64 id; // Client API fields: The client must set up these fields *before* calling mDNS_StartQuery() mDNSInterfaceID InterfaceID; // Non-zero if you want to issue queries only on a single specific IP interface mDNSAddr Target; // Non-zero if you want to direct queries to a specific unicast target address mDNSIPPort TargetPort; // Must be set if Target is set mDNSOpaque16 TargetQID; // Must be set if Target is set domainname qname; mDNSu16 qtype; mDNSu16 qclass; mDNSBool LongLived; // Set by client for calls to mDNS_StartQuery to indicate LLQs to unicast layer. mDNSBool ExpectUnique; // Set by client if it's expecting unique RR(s) for this question, not shared RRs mDNSBool ForceMCast; // Set by client to force mDNS query, even for apparently uDNS names mDNSBool ReturnIntermed; // Set by client to request callbacks for intermediate CNAME/NXDOMAIN results mDNSBool SuppressUnusable; // Set by client to suppress unusable queries to be sent on the wire mDNSBool RetryWithSearchDomains; // Retry with search domains if there is no entry in the cache or AuthRecords mDNSu8 TimeoutQuestion; // Timeout this question if there is no reply in configured time mDNSu8 WakeOnResolve; // Send wakeup on resolve mDNSs8 SearchListIndex; // Index into SearchList; Used by the client layer but not touched by core mDNSs8 AppendSearchDomains; // Search domains can be appended for this query mDNSs8 AppendLocalSearchDomains; // Search domains ending in .local can be appended for this query domainname *qnameOrig; // Copy of the original question name if it is not fully qualified mDNSQuestionCallback *QuestionCallback; void *QuestionContext; }; typedef struct { // Client API fields: The client must set up name and InterfaceID *before* calling mDNS_StartResolveService() // When the callback is invoked, ip, port, TXTlen and TXTinfo will have been filled in with the results learned from the network. domainname name; mDNSInterfaceID InterfaceID; // ID of the interface the response was received on mDNSAddr ip; // Remote (destination) IP address where this service can be accessed mDNSIPPort port; // Port where this service can be accessed mDNSu16 TXTlen; mDNSu8 TXTinfo[2048]; // Additional demultiplexing information (e.g. LPR queue name) } ServiceInfo; // Note: Within an mDNSServiceInfoQueryCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute() typedef struct ServiceInfoQuery_struct ServiceInfoQuery; typedef void mDNSServiceInfoQueryCallback(mDNS *const m, ServiceInfoQuery *query); struct ServiceInfoQuery_struct { // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. // No fields need to be set up by the client prior to calling mDNS_StartResolveService(); // all required data is passed as parameters to that function. // The ServiceInfoQuery structure memory is working storage for mDNSCore to discover the requested information // and place it in the ServiceInfo structure. After the client has called mDNS_StopResolveService(), it may // dispose of the ServiceInfoQuery structure while retaining the results in the ServiceInfo structure. DNSQuestion qSRV; DNSQuestion qTXT; DNSQuestion qAv4; DNSQuestion qAv6; mDNSu8 GotSRV; mDNSu8 GotTXT; mDNSu8 GotADD; mDNSu32 Answers; ServiceInfo *info; mDNSServiceInfoQueryCallback *ServiceInfoQueryCallback; void *ServiceInfoQueryContext; }; typedef enum { ZoneServiceUpdate, ZoneServiceQuery, ZoneServiceLLQ } ZoneService; typedef void ZoneDataCallback(mDNS *const m, mStatus err, const ZoneData *result); struct ZoneData_struct { domainname ChildName; // Name for which we're trying to find the responsible server ZoneService ZoneService; // Which service we're seeking for this zone (update, query, or LLQ) domainname *CurrentSOA; // Points to somewhere within ChildName domainname ZoneName; // Discovered result: Left-hand-side of SOA record mDNSu16 ZoneClass; // Discovered result: DNS Class from SOA record domainname Host; // Discovered result: Target host from SRV record mDNSIPPort Port; // Discovered result: Update port, query port, or LLQ port from SRV record mDNSAddr Addr; // Discovered result: Address of Target host from SRV record mDNSBool ZonePrivate; // Discovered result: Does zone require encrypted queries? ZoneDataCallback *ZoneDataCallback; // Caller-specified function to be called upon completion void *ZoneDataContext; DNSQuestion question; // Storage for any active question }; extern ZoneData *StartGetZoneData(mDNS *const m, const domainname *const name, const ZoneService target, ZoneDataCallback callback, void *callbackInfo); extern void CancelGetZoneData(mDNS *const m, ZoneData *nta); extern mDNSBool IsGetZoneDataQuestion(DNSQuestion *q); typedef struct DNameListElem { struct DNameListElem *next; mDNSu32 uid; domainname name; } DNameListElem; #if APPLE_OSX_mDNSResponder // Different states that we go through locating the peer #define TC_STATE_AAAA_PEER 0x000000001 /* Peer's BTMM IPv6 address */ #define TC_STATE_AAAA_PEER_RELAY 0x000000002 /* Peer's IPv6 Relay address */ #define TC_STATE_SRV_PEER 0x000000003 /* Peer's SRV Record corresponding to IPv4 address */ #define TC_STATE_ADDR_PEER 0x000000004 /* Peer's IPv4 address */ typedef struct ClientTunnel { struct ClientTunnel *next; const char *prefix; domainname dstname; mDNSBool MarkedForDeletion; mDNSv6Addr loc_inner; mDNSv4Addr loc_outer; mDNSv6Addr loc_outer6; mDNSv6Addr rmt_inner; mDNSv4Addr rmt_outer; mDNSv6Addr rmt_outer6; mDNSIPPort rmt_outer_port; mDNSu16 tc_state; DNSQuestion q; } ClientTunnel; #endif typedef struct NetworkInterfaceInfo_struct NetworkInterfaceInfo; // A NetworkInterfaceInfo_struct serves two purposes: // 1. It holds the address, PTR and HINFO records to advertise a given IP address on a given physical interface // 2. It tells mDNSCore which physical interfaces are available; each physical interface has its own unique InterfaceID. // Since there may be multiple IP addresses on a single physical interface, // there may be multiple NetworkInterfaceInfo_structs with the same InterfaceID. // In this case, to avoid sending the same packet n times, when there's more than one // struct with the same InterfaceID, mDNSCore picks one member of the set to be the // active representative of the set; all others have the 'InterfaceActive' flag unset. struct NetworkInterfaceInfo_struct { // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them. NetworkInterfaceInfo *next; mDNSu8 InterfaceActive; // Set if interface is sending & receiving packets (see comment above) mDNSu8 IPv4Available; // If InterfaceActive, set if v4 available on this InterfaceID mDNSu8 IPv6Available; // If InterfaceActive, set if v6 available on this InterfaceID DNSQuestion NetWakeBrowse; DNSQuestion NetWakeResolve[3]; // For fault-tolerance, we try up to three Sleep Proxies mDNSAddr SPSAddr[3]; mDNSIPPort SPSPort[3]; mDNSs32 NextSPSAttempt; // -1 if we're not currently attempting to register with any Sleep Proxy mDNSs32 NextSPSAttemptTime; // Standard AuthRecords that every Responder host should have (one per active IP address) AuthRecord RR_A; // 'A' or 'AAAA' (address) record for our ".local" name AuthRecord RR_PTR; // PTR (reverse lookup) record AuthRecord RR_HINFO; // Client API fields: The client must set up these fields *before* calling mDNS_RegisterInterface() mDNSInterfaceID InterfaceID; // Identifies physical interface; MUST NOT be 0, -1, or -2 mDNSAddr ip; // The IPv4 or IPv6 address to advertise mDNSAddr mask; mDNSEthAddr MAC; char ifname[64]; // Windows uses a GUID string for the interface name, which doesn't fit in 16 bytes mDNSu8 Advertise; // False if you are only searching on this interface mDNSu8 McastTxRx; // Send/Receive multicast on this { InterfaceID, address family } ? mDNSu8 NetWake; // Set if Wake-On-Magic-Packet is enabled on this interface mDNSu8 Loopback; // Set if this is the loopback interface }; #define SLE_DELETE 0x00000001 #define SLE_WAB_QUERY_STARTED 0x00000002 typedef struct SearchListElem { struct SearchListElem *next; domainname domain; int flag; mDNSInterfaceID InterfaceID; DNSQuestion BrowseQ; DNSQuestion DefBrowseQ; DNSQuestion AutomaticBrowseQ; DNSQuestion RegisterQ; DNSQuestion DefRegisterQ; int numCfAnswers; ARListElem *AuthRecs; } SearchListElem; // For domain enumeration and automatic browsing // This is the user's DNS search list. // In each of these domains we search for our special pointer records (lb._dns-sd._udp., etc.) // to discover recommended domains for domain enumeration (browse, default browse, registration, // default registration) and possibly one or more recommended automatic browsing domains. extern SearchListElem *mDNS_SearchList; // This really ought to be part of mDNS_struct -- SC // *************************************************************************** typedef void mDNSCallback(mDNS *const m, mStatus result); #define CACHE_HASH_SLOTS 499 enum { // Bit flags -- i.e. values should be 1, 2, 4, 8, etc. mDNS_KnownBug_LimitedIPv6 = 1, mDNS_KnownBug_LossySyslog = 2 // }; enum { SleepState_Awake = 0, SleepState_Transferring = 1, SleepState_Sleeping = 2 }; struct mDNS_struct { // Internal state fields. These hold the main internal state of mDNSCore; // the client layer needn't be concerned with them. // No fields need to be set up by the client prior to calling mDNS_Init(); // all required data is passed as parameters to that function. mDNS_PlatformSupport *p; // Pointer to platform-specific data of indeterminite size mDNSu32 KnownBugs; mDNSBool CanReceiveUnicastOn5353; mDNSBool AdvertiseLocalAddresses; mDNSBool DivertMulticastAdvertisements; // from interfaces that do not advertise local addresses to local-only mStatus mDNSPlatformStatus; mDNSIPPort UnicastPort4; mDNSIPPort UnicastPort6; mDNSEthAddr PrimaryMAC; // Used as unique host ID mDNSCallback *MainCallback; void *MainContext; // For debugging: To catch and report locking failures mDNSu32 mDNS_busy; // Incremented between mDNS_Lock/mDNS_Unlock section mDNSu32 mDNS_reentrancy; // Incremented when calling a client callback mDNSu8 lock_rrcache; // For debugging: Set at times when these lists may not be modified mDNSu8 lock_Questions; mDNSu8 lock_Records; #ifndef MaxMsg #define MaxMsg 160 #endif char MsgBuffer[MaxMsg]; // Temp storage used while building error log messages // Task Scheduling variables mDNSs32 timenow_adjust; // Correction applied if we ever discover time went backwards mDNSs32 timenow; // The time that this particular activation of the mDNS code started mDNSs32 timenow_last; // The time the last time we ran mDNSs32 NextScheduledEvent; // Derived from values below mDNSs32 ShutdownTime; // Set when we're shutting down; allows us to skip some unnecessary steps mDNSs32 SuppressSending; // Don't send local-link mDNS packets during this time mDNSs32 NextCacheCheck; // Next time to refresh cache record before it expires mDNSs32 NextScheduledQuery; // Next time to send query in its exponential backoff sequence mDNSs32 NextScheduledProbe; // Next time to probe for new authoritative record mDNSs32 NextScheduledResponse; // Next time to send authoritative record(s) in responses mDNSs32 NextScheduledNATOp; // Next time to send NAT-traversal packets mDNSs32 NextScheduledSPS; // Next time to purge expiring Sleep Proxy records mDNSs32 RandomQueryDelay; // For de-synchronization of query packets on the wire mDNSu32 RandomReconfirmDelay; // For de-synchronization of reconfirmation queries on the wire mDNSs32 PktNum; // Unique sequence number assigned to each received packet mDNSu8 LocalRemoveEvents; // Set if we may need to deliver remove events for local-only questions and/or local-only records mDNSu8 SleepState; // Set if we're sleeping mDNSu8 SleepSeqNum; // "Epoch number" of our current period of wakefulness mDNSu8 SystemWakeOnLANEnabled; // Set if we want to register with a Sleep Proxy before going to sleep mDNSu8 SentSleepProxyRegistration;// Set if we registered (or tried to register) with a Sleep Proxy mDNSu8 SystemSleepOnlyIfWakeOnLAN;// Set if we may only sleep if we managed to register with a Sleep Proxy mDNSs32 AnnounceOwner; // After waking from sleep, include OWNER option in packets until this time mDNSs32 DelaySleep; // To inhibit re-sleeping too quickly right after wake mDNSs32 SleepLimit; // Time window to allow deregistrations, etc., // during which underying platform layer should inhibit system sleep mDNSs32 NextScheduledSPRetry; // Time next sleep proxy registration action is required. // Only valid if SleepLimit is nonzero and DelaySleep is zero. mDNSs32 NextScheduledStopTime; // Next time to stop a question // These fields only required for mDNS Searcher... DNSQuestion *Questions; // List of all registered questions, active and inactive DNSQuestion *NewQuestions; // Fresh questions not yet answered from cache DNSQuestion *CurrentQuestion; // Next question about to be examined in AnswerLocalQuestions() DNSQuestion *LocalOnlyQuestions; // Questions with InterfaceID set to mDNSInterface_LocalOnly or mDNSInterface_P2P DNSQuestion *NewLocalOnlyQuestions; // Fresh local-only or P2P questions not yet answered DNSQuestion *RestartQuestion; // Questions that are being restarted (stop followed by start) mDNSu32 rrcache_size; // Total number of available cache entries mDNSu32 rrcache_totalused; // Number of cache entries currently occupied mDNSu32 rrcache_active; // Number of cache entries currently occupied by records that answer active questions mDNSu32 rrcache_report; CacheEntity *rrcache_free; CacheGroup *rrcache_hash[CACHE_HASH_SLOTS]; mDNSs32 rrcache_nextcheck[CACHE_HASH_SLOTS]; AuthHash rrauth; // Fields below only required for mDNS Responder... domainlabel nicelabel; // Rich text label encoded using canonically precomposed UTF-8 domainlabel hostlabel; // Conforms to RFC 1034 "letter-digit-hyphen" ARPANET host name rules domainname MulticastHostname; // Fully Qualified "dot-local" Host Name, e.g. "Foo.local." UTF8str255 HIHardware; UTF8str255 HISoftware; AuthRecord DeviceInfo; AuthRecord *ResourceRecords; AuthRecord *DuplicateRecords; // Records currently 'on hold' because they are duplicates of existing records AuthRecord *NewLocalRecords; // Fresh AuthRecords (public) not yet delivered to our local-only questions AuthRecord *CurrentRecord; // Next AuthRecord about to be examined mDNSBool NewLocalOnlyRecords; // Fresh AuthRecords (local only) not yet delivered to our local questions NetworkInterfaceInfo *HostInterfaces; mDNSs32 ProbeFailTime; mDNSu32 NumFailedProbes; mDNSs32 SuppressProbes; // Unicast-specific data mDNSs32 NextuDNSEvent; // uDNS next event mDNSs32 NextSRVUpdate; // Time to perform delayed update DNSServer *DNSServers; // list of DNS servers McastResolver *McastResolvers; // list of Mcast Resolvers mDNSAddr Router; mDNSAddr AdvertisedV4; // IPv4 address pointed to by hostname mDNSAddr AdvertisedV6; // IPv6 address pointed to by hostname DomainAuthInfo *AuthInfoList; // list of domains requiring authentication for updates DNSQuestion ReverseMap; // Reverse-map query to find static hostname for service target DNSQuestion AutomaticBrowseDomainQ; domainname StaticHostname; // Current answer to reverse-map query domainname FQDN; HostnameInfo *Hostnames; // List of registered hostnames + hostname metadata mDNSv6Addr AutoTunnelHostAddr; // IPv6 address advertised for AutoTunnel services on this machine mDNSBool AutoTunnelHostAddrActive; // AutoTunnel Relay address has two distinct uses // AutoTunnelRelayAddrIn: If non-zero, it means that this host can be reached (inbound connection) through the relay // AutoTunnelRelayAddrOut: If non-zero, it means that this host can use the relay to reach (outbound connection) the // other hosts through the relay mDNSv6Addr AutoTunnelRelayAddrIn; mDNSv6Addr AutoTunnelRelayAddrOut; domainlabel AutoTunnelLabel; // Used to construct hostname for *IPv4* address of tunnel endpoints mDNSBool StartWABQueries; // Start WAB queries for the purpose of domain enumeration mDNSBool RegisterAutoTunnel6; // NAT-Traversal fields NATTraversalInfo LLQNAT; // Single shared NAT Traversal to receive inbound LLQ notifications NATTraversalInfo *NATTraversals; NATTraversalInfo *CurrentNATTraversal; mDNSs32 retryIntervalGetAddr; // delta between time sent and retry mDNSs32 retryGetAddr; // absolute time when we retry mDNSv4Addr ExternalAddress; UDPSocket *NATMcastRecvskt; // For receiving NAT-PMP AddrReply multicasts from router on port 5350 mDNSu32 LastNATupseconds; // NAT engine uptime in seconds, from most recent NAT packet mDNSs32 LastNATReplyLocalTime; // Local time in ticks when most recent NAT packet was received mDNSu16 LastNATMapResultCode; // Most recent error code for mappings tcpLNTInfo tcpAddrInfo; // legacy NAT traversal TCP connection info for external address tcpLNTInfo tcpDeviceInfo; // legacy NAT traversal TCP connection info for device info tcpLNTInfo *tcpInfoUnmapList; // list of pending unmap requests mDNSInterfaceID UPnPInterfaceID; UDPSocket *SSDPSocket; // For SSDP request/response mDNSBool SSDPWANPPPConnection; // whether we should send the SSDP query for WANIPConnection or WANPPPConnection mDNSIPPort UPnPRouterPort; // port we send discovery messages to mDNSIPPort UPnPSOAPPort; // port we send SOAP messages to mDNSu8 *UPnPRouterURL; // router's URL string mDNSBool UPnPWANPPPConnection; // whether we're using WANIPConnection or WANPPPConnection mDNSu8 *UPnPSOAPURL; // router's SOAP control URL string mDNSu8 *UPnPRouterAddressString; // holds both the router's address and port mDNSu8 *UPnPSOAPAddressString; // holds both address and port for SOAP messages // Sleep Proxy Server fields mDNSu8 SPSType; // 0 = off, 10-99 encodes desirability metric mDNSu8 SPSPortability; // 10-99 mDNSu8 SPSMarginalPower; // 10-99 mDNSu8 SPSTotalPower; // 10-99 mDNSu8 SPSState; // 0 = off, 1 = running, 2 = shutting down, 3 = suspended during sleep mDNSInterfaceID SPSProxyListChanged; UDPSocket *SPSSocket; ServiceRecordSet SPSRecords; mDNSQuestionCallback *SPSBrowseCallback; // So the platform layer can do something useful with SPS browse results int ProxyRecords; // Total number of records we're holding as proxy #define MAX_PROXY_RECORDS 10000 /* DOS protection: 400 machines at 25 records each */ #if APPLE_OSX_mDNSResponder ClientTunnel *TunnelClients; uuid_t asl_uuid; // uuid for ASL logging void *WCF; #endif // Fixed storage, to avoid creating large objects on the stack // The imsg is declared as a union with a pointer type to enforce CPU-appropriate alignment union { DNSMessage m; void *p; } imsg; // Incoming message received from wire DNSMessage omsg; // Outgoing message we're building LargeCacheRecord rec; // Resource Record extracted from received message }; #define FORALL_CACHERECORDS(SLOT,CG,CR) \ for ((SLOT) = 0; (SLOT) < CACHE_HASH_SLOTS; (SLOT)++) \ for ((CG)=m->rrcache_hash[(SLOT)]; (CG); (CG)=(CG)->next) \ for ((CR) = (CG)->members; (CR); (CR)=(CR)->next) // *************************************************************************** extern const mDNSInterfaceID mDNSInterface_Any; // Zero extern const mDNSInterfaceID mDNSInterface_LocalOnly; // Special value extern const mDNSInterfaceID mDNSInterface_Unicast; // Special value extern const mDNSInterfaceID mDNSInterfaceMark; // Special value extern const mDNSInterfaceID mDNSInterface_P2P; // Special value extern const mDNSIPPort DiscardPort; extern const mDNSIPPort SSHPort; extern const mDNSIPPort UnicastDNSPort; extern const mDNSIPPort SSDPPort; extern const mDNSIPPort IPSECPort; extern const mDNSIPPort NSIPCPort; extern const mDNSIPPort NATPMPAnnouncementPort; extern const mDNSIPPort NATPMPPort; extern const mDNSIPPort DNSEXTPort; extern const mDNSIPPort MulticastDNSPort; extern const mDNSIPPort LoopbackIPCPort; extern const mDNSIPPort PrivateDNSPort; extern const OwnerOptData zeroOwner; extern const mDNSIPPort zeroIPPort; extern const mDNSv4Addr zerov4Addr; extern const mDNSv6Addr zerov6Addr; extern const mDNSEthAddr zeroEthAddr; extern const mDNSv4Addr onesIPv4Addr; extern const mDNSv6Addr onesIPv6Addr; extern const mDNSEthAddr onesEthAddr; extern const mDNSAddr zeroAddr; extern const mDNSv4Addr AllDNSAdminGroup; extern const mDNSv4Addr AllHosts_v4; extern const mDNSv6Addr AllHosts_v6; extern const mDNSv6Addr NDP_prefix; extern const mDNSEthAddr AllHosts_v6_Eth; extern const mDNSAddr AllDNSLinkGroup_v4; extern const mDNSAddr AllDNSLinkGroup_v6; extern const mDNSOpaque16 zeroID; extern const mDNSOpaque16 onesID; extern const mDNSOpaque16 QueryFlags; extern const mDNSOpaque16 uQueryFlags; extern const mDNSOpaque16 ResponseFlags; extern const mDNSOpaque16 UpdateReqFlags; extern const mDNSOpaque16 UpdateRespFlags; extern const mDNSOpaque64 zeroOpaque64; extern mDNSBool StrictUnicastOrdering; extern mDNSu8 NumUnicastDNSServers; #define localdomain (*(const domainname *)"\x5" "local") #define DeviceInfoName (*(const domainname *)"\xC" "_device-info" "\x4" "_tcp") #define SleepProxyServiceType (*(const domainname *)"\xC" "_sleep-proxy" "\x4" "_udp") // *************************************************************************** #if (defined(_MSC_VER)) #define mDNSinline static __inline #elif ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9))) #define mDNSinline static inline #endif // If we're not doing inline functions, then this header needs to have the extern declarations #if !defined(mDNSinline) extern mDNSs32 NonZeroTime(mDNSs32 t); extern mDNSu16 mDNSVal16(mDNSOpaque16 x); extern mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v); #endif // If we're compiling the particular C file that instantiates our inlines, then we // define "mDNSinline" (to empty string) so that we generate code in the following section #if (!defined(mDNSinline) && mDNS_InstantiateInlines) #define mDNSinline #endif #ifdef mDNSinline mDNSinline mDNSs32 NonZeroTime(mDNSs32 t) { if (t) { return (t); } else { return (1); } } mDNSinline mDNSu16 mDNSVal16(mDNSOpaque16 x) { return ((mDNSu16)((mDNSu16)x.b[0] << 8 | (mDNSu16)x.b[1])); } mDNSinline mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v) { mDNSOpaque16 x; x.b[0] = (mDNSu8)(v >> 8); x.b[1] = (mDNSu8)(v & 0xFF); return (x); } #endif // *************************************************************************** // Every client should call mDNS_Init, passing in storage for the mDNS object and the mDNS_PlatformSupport object. // // Clients that are only advertising services should use mDNS_Init_NoCache and mDNS_Init_ZeroCacheSize. // Clients that plan to perform queries (mDNS_StartQuery, mDNS_StartBrowse, mDNS_StartResolveService, etc.) // need to provide storage for the resource record cache, or the query calls will return 'mStatus_NoCache'. // The rrcachestorage parameter is the address of memory for the resource record cache, and // the rrcachesize parameter is the number of entries in the CacheRecord array passed in. // (i.e. the size of the cache memory needs to be sizeof(CacheRecord) * rrcachesize). // OS X 10.3 Panther uses an initial cache size of 64 entries, and then mDNSCore sends an // mStatus_GrowCache message if it needs more. // // Most clients should use mDNS_Init_AdvertiseLocalAddresses. This causes mDNSCore to automatically // create the correct address records for all the hosts interfaces. If you plan to advertise // services being offered by the local machine, this is almost always what you want. // There are two cases where you might use mDNS_Init_DontAdvertiseLocalAddresses: // 1. A client-only device, that browses for services but doesn't advertise any of its own. // 2. A proxy-registration service, that advertises services being offered by other machines, and takes // the appropriate steps to manually create the correct address records for those other machines. // In principle, a proxy-like registration service could manually create address records for its own machine too, // but this would be pointless extra effort when using mDNS_Init_AdvertiseLocalAddresses does that for you. // // Note that a client-only device that wishes to prohibit multicast advertisements (e.g. from // higher-layer API calls) must also set DivertMulticastAdvertisements in the mDNS structure and // advertise local address(es) on a loopback interface. // // When mDNS has finished setting up the client's callback is called // A client can also spin and poll the mDNSPlatformStatus field to see when it changes from mStatus_Waiting to mStatus_NoError // // Call mDNS_StartExit to tidy up before exiting // Because exiting may be an asynchronous process (e.g. if unicast records need to be deregistered) // client layer may choose to wait until mDNS_ExitNow() returns true before calling mDNS_FinalExit(). // // Call mDNS_Register with a completed AuthRecord object to register a resource record // If the resource record type is kDNSRecordTypeUnique (or kDNSknownunique) then if a conflicting resource record is discovered, // the resource record's mDNSRecordCallback will be called with error code mStatus_NameConflict. The callback should deregister // the record, and may then try registering the record again after picking a new name (e.g. by automatically appending a number). // Following deregistration, the RecordCallback will be called with result mStatus_MemFree to signal that it is safe to deallocate // the record's storage (memory must be freed asynchronously to allow for goodbye packets and dynamic update deregistration). // // Call mDNS_StartQuery to initiate a query. mDNS will proceed to issue Multicast DNS query packets, and any time a response // is received containing a record which matches the question, the DNSQuestion's mDNSAnswerCallback function will be called // Call mDNS_StopQuery when no more answers are required // // Care should be taken on multi-threaded or interrupt-driven environments. // The main mDNS routines call mDNSPlatformLock() on entry and mDNSPlatformUnlock() on exit; // each platform layer needs to implement these appropriately for its respective platform. // For example, if the support code on a particular platform implements timer callbacks at interrupt time, then // mDNSPlatformLock/Unlock need to disable interrupts or do similar concurrency control to ensure that the mDNS // code is not entered by an interrupt-time timer callback while in the middle of processing a client call. extern mStatus mDNS_Init(mDNS *const m, mDNS_PlatformSupport *const p, CacheEntity *rrcachestorage, mDNSu32 rrcachesize, mDNSBool AdvertiseLocalAddresses, mDNSCallback *Callback, void *Context); // See notes above on use of NoCache/ZeroCacheSize #define mDNS_Init_NoCache mDNSNULL #define mDNS_Init_ZeroCacheSize 0 // See notes above on use of Advertise/DontAdvertiseLocalAddresses #define mDNS_Init_AdvertiseLocalAddresses mDNStrue #define mDNS_Init_DontAdvertiseLocalAddresses mDNSfalse #define mDNS_Init_NoInitCallback mDNSNULL #define mDNS_Init_NoInitCallbackContext mDNSNULL extern void mDNS_ConfigChanged(mDNS *const m); extern void mDNS_GrowCache(mDNS *const m, CacheEntity *storage, mDNSu32 numrecords); extern void mDNS_GrowAuth(mDNS *const m, AuthEntity *storage, mDNSu32 numrecords); extern void mDNS_StartExit(mDNS *const m); extern void mDNS_FinalExit(mDNS *const m); #define mDNS_Close(m) do { mDNS_StartExit(m); mDNS_FinalExit(m); } while(0) #define mDNS_ExitNow(m, now) ((now) - (m)->ShutdownTime >= 0 || (!(m)->ResourceRecords)) extern mDNSs32 mDNS_Execute(mDNS *const m); extern mStatus mDNS_Register(mDNS *const m, AuthRecord *const rr); extern mStatus mDNS_Update(mDNS *const m, AuthRecord *const rr, mDNSu32 newttl, const mDNSu16 newrdlength, RData *const newrdata, mDNSRecordUpdateCallback *Callback); extern mStatus mDNS_Deregister(mDNS *const m, AuthRecord *const rr); extern mStatus mDNS_StartQuery(mDNS *const m, DNSQuestion *const question); extern mStatus mDNS_StopQuery(mDNS *const m, DNSQuestion *const question); extern mStatus mDNS_StopQueryWithRemoves(mDNS *const m, DNSQuestion *const question); extern mStatus mDNS_Reconfirm(mDNS *const m, CacheRecord *const cacherr); extern mStatus mDNS_ReconfirmByValue(mDNS *const m, ResourceRecord *const rr); extern void mDNS_PurgeCacheResourceRecord(mDNS *const m, CacheRecord *rr); extern mDNSs32 mDNS_TimeNow(const mDNS *const m); extern mStatus mDNS_StartNATOperation(mDNS *const m, NATTraversalInfo *traversal); extern mStatus mDNS_StopNATOperation(mDNS *const m, NATTraversalInfo *traversal); extern mStatus mDNS_StopNATOperation_internal(mDNS *m, NATTraversalInfo *traversal); extern DomainAuthInfo *GetAuthInfoForName(mDNS *m, const domainname *const name); extern void mDNS_UpdateAllowSleep(mDNS *const m); // *************************************************************************** #if 0 #pragma mark - #pragma mark - Platform support functions that are accessible to the client layer too #endif extern mDNSs32 mDNSPlatformOneSecond; // *************************************************************************** // mDNS_Dereg_normal is used for most calls to mDNS_Deregister_internal // mDNS_Dereg_rapid is used to send one goodbye instead of three, when we want the memory available for reuse sooner // mDNS_Dereg_conflict is used to indicate that this record is being forcibly deregistered because of a conflict // mDNS_Dereg_repeat is used when cleaning up, for records that may have already been forcibly deregistered typedef enum { mDNS_Dereg_normal, mDNS_Dereg_rapid, mDNS_Dereg_conflict, mDNS_Dereg_repeat } mDNS_Dereg_type; // mDNS_RegisterService is a single call to register the set of resource records associated with a given named service. // // mDNS_StartResolveService is single call which is equivalent to multiple calls to mDNS_StartQuery, // to find the IP address, port number, and demultiplexing information for a given named service. // As with mDNS_StartQuery, it executes asynchronously, and calls the ServiceInfoQueryCallback when the answer is // found. After the service is resolved, the client should call mDNS_StopResolveService to complete the transaction. // The client can also call mDNS_StopResolveService at any time to abort the transaction. // // mDNS_AddRecordToService adds an additional record to a Service Record Set. This record may be deregistered // via mDNS_RemoveRecordFromService, or by deregistering the service. mDNS_RemoveRecordFromService is passed a // callback to free the memory associated with the extra RR when it is safe to do so. The ExtraResourceRecord // object can be found in the record's context pointer. // mDNS_GetBrowseDomains is a special case of the mDNS_StartQuery call, where the resulting answers // are a list of PTR records indicating (in the rdata) domains that are recommended for browsing. // After getting the list of domains to browse, call mDNS_StopQuery to end the search. // mDNS_GetDefaultBrowseDomain returns the name of the domain that should be highlighted by default. // // mDNS_GetRegistrationDomains and mDNS_GetDefaultRegistrationDomain are the equivalent calls to get the list // of one or more domains that should be offered to the user as choices for where they may register their service, // and the default domain in which to register in the case where the user has made no selection. extern void mDNS_SetupResourceRecord(AuthRecord *rr, RData *RDataStorage, mDNSInterfaceID InterfaceID, mDNSu16 rrtype, mDNSu32 ttl, mDNSu8 RecordType, AuthRecType artype, mDNSRecordCallback Callback, void *Context); // mDNS_RegisterService() flags parameter bit definitions enum { regFlagIncludeP2P = 0x1, // include P2P interfaces when using mDNSInterface_Any regFlagKnownUnique = 0x2 // client guarantees that SRV and TXT record names are unique }; extern mStatus mDNS_RegisterService(mDNS *const m, ServiceRecordSet *sr, const domainlabel *const name, const domainname *const type, const domainname *const domain, const domainname *const host, mDNSIPPort port, const mDNSu8 txtinfo[], mDNSu16 txtlen, AuthRecord *SubTypes, mDNSu32 NumSubTypes, mDNSInterfaceID InterfaceID, mDNSServiceCallback Callback, void *Context, mDNSu32 flags); extern mStatus mDNS_AddRecordToService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, RData *rdata, mDNSu32 ttl, mDNSu32 includeP2P); extern mStatus mDNS_RemoveRecordFromService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, mDNSRecordCallback MemFreeCallback, void *Context); extern mStatus mDNS_RenameAndReregisterService(mDNS *const m, ServiceRecordSet *const sr, const domainlabel *newname); extern mStatus mDNS_DeregisterService_drt(mDNS *const m, ServiceRecordSet *sr, mDNS_Dereg_type drt); #define mDNS_DeregisterService(M,S) mDNS_DeregisterService_drt((M), (S), mDNS_Dereg_normal) extern mStatus mDNS_RegisterNoSuchService(mDNS *const m, AuthRecord *const rr, const domainlabel *const name, const domainname *const type, const domainname *const domain, const domainname *const host, const mDNSInterfaceID InterfaceID, mDNSRecordCallback Callback, void *Context, mDNSBool includeP2P); #define mDNS_DeregisterNoSuchService mDNS_Deregister extern void mDNS_SetupQuestion(DNSQuestion *const q, const mDNSInterfaceID InterfaceID, const domainname *const name, const mDNSu16 qtype, mDNSQuestionCallback *const callback, void *const context); extern mStatus mDNS_StartBrowse(mDNS *const m, DNSQuestion *const question, const domainname *const srv, const domainname *const domain, const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context); #define mDNS_StopBrowse mDNS_StopQuery extern mStatus mDNS_StartResolveService(mDNS *const m, ServiceInfoQuery *query, ServiceInfo *info, mDNSServiceInfoQueryCallback *Callback, void *Context); extern void mDNS_StopResolveService(mDNS *const m, ServiceInfoQuery *query); typedef enum { mDNS_DomainTypeBrowse = 0, mDNS_DomainTypeBrowseDefault = 1, mDNS_DomainTypeBrowseAutomatic = 2, mDNS_DomainTypeRegistration = 3, mDNS_DomainTypeRegistrationDefault = 4, mDNS_DomainTypeMax = 4 } mDNS_DomainType; extern const char *const mDNS_DomainTypeNames[]; extern mStatus mDNS_GetDomains(mDNS *const m, DNSQuestion *const question, mDNS_DomainType DomainType, const domainname *dom, const mDNSInterfaceID InterfaceID, mDNSQuestionCallback *Callback, void *Context); #define mDNS_StopGetDomains mDNS_StopQuery extern mStatus mDNS_AdvertiseDomains(mDNS *const m, AuthRecord *rr, mDNS_DomainType DomainType, const mDNSInterfaceID InterfaceID, char *domname); #define mDNS_StopAdvertiseDomains mDNS_Deregister extern mDNSOpaque16 mDNS_NewMessageID(mDNS *const m); extern mDNSBool mDNS_AddressIsLocalSubnet(mDNS *const m, const mDNSInterfaceID InterfaceID, const mDNSAddr *addr); extern DNSServer *GetServerForName(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID); extern DNSServer *GetServerForQuestion(mDNS *m, DNSQuestion *question); extern mDNSu32 SetValidDNSServers(mDNS *m, DNSQuestion *question); // *************************************************************************** // In order to expose the full capabilities of the DNS protocol (which allows any arbitrary eight-bit values // in domain name labels, including unlikely characters like ascii nulls and even dots) all the mDNS APIs // work with DNS's native length-prefixed strings. For convenience in C, the following utility functions // are provided for converting between C's null-terminated strings and DNS's length-prefixed strings. // Assignment // A simple C structure assignment of a domainname can cause a protection fault by accessing unmapped memory, // because that object is defined to be 256 bytes long, but not all domainname objects are truly the full size. // This macro uses mDNSPlatformMemCopy() to make sure it only touches the actual bytes that are valid. #define AssignDomainName(DST, SRC) do { mDNSu16 len__ = DomainNameLength((SRC)); \ if (len__ <= MAX_DOMAIN_NAME) mDNSPlatformMemCopy((DST)->c, (SRC)->c, len__); else (DST)->c[0] = 0; } while(0) // Comparison functions #define SameDomainLabelCS(A,B) ((A)[0] == (B)[0] && mDNSPlatformMemSame((A)+1, (B)+1, (A)[0])) extern mDNSBool SameDomainLabel(const mDNSu8 *a, const mDNSu8 *b); extern mDNSBool SameDomainName(const domainname *const d1, const domainname *const d2); extern mDNSBool SameDomainNameCS(const domainname *const d1, const domainname *const d2); typedef mDNSBool DomainNameComparisonFn(const domainname *const d1, const domainname *const d2); extern mDNSBool IsLocalDomain(const domainname *d); // returns true for domains that by default should be looked up using link-local multicast #define StripFirstLabel(X) ((const domainname *)&(X)->c[(X)->c[0] ? 1 + (X)->c[0] : 0]) #define FirstLabel(X) ((const domainlabel *)(X)) #define SecondLabel(X) ((const domainlabel *)StripFirstLabel(X)) #define ThirdLabel(X) ((const domainlabel *)StripFirstLabel(StripFirstLabel(X))) extern const mDNSu8 *LastLabel(const domainname *d); // Get total length of domain name, in native DNS format, including terminal root label // (e.g. length of "com." is 5 (length byte, three data bytes, final zero) extern mDNSu16 DomainNameLengthLimit(const domainname *const name, const mDNSu8 *limit); #define DomainNameLength(name) DomainNameLengthLimit((name), (name)->c + MAX_DOMAIN_NAME) // Append functions to append one or more labels to an existing native format domain name: // AppendLiteralLabelString adds a single label from a literal C string, with no escape character interpretation. // AppendDNSNameString adds zero or more labels from a C string using conventional DNS dots-and-escaping interpretation // AppendDomainLabel adds a single label from a native format domainlabel // AppendDomainName adds zero or more labels from a native format domainname extern mDNSu8 *AppendLiteralLabelString(domainname *const name, const char *cstr); extern mDNSu8 *AppendDNSNameString(domainname *const name, const char *cstr); extern mDNSu8 *AppendDomainLabel(domainname *const name, const domainlabel *const label); extern mDNSu8 *AppendDomainName(domainname *const name, const domainname *const append); // Convert from null-terminated string to native DNS format: // The DomainLabel form makes a single label from a literal C string, with no escape character interpretation. // The DomainName form makes native format domain name from a C string using conventional DNS interpretation: // dots separate labels, and within each label, '\.' represents a literal dot, '\\' represents a literal // backslash and backslash with three decimal digits (e.g. \000) represents an arbitrary byte value. extern mDNSBool MakeDomainLabelFromLiteralString(domainlabel *const label, const char *cstr); extern mDNSu8 *MakeDomainNameFromDNSNameString(domainname *const name, const char *cstr); // Convert native format domainlabel or domainname back to C string format // IMPORTANT: // When using ConvertDomainLabelToCString, the target buffer must be MAX_ESCAPED_DOMAIN_LABEL (254) bytes long // to guarantee there will be no buffer overrun. It is only safe to use a buffer shorter than this in rare cases // where the label is known to be constrained somehow (for example, if the label is known to be either "_tcp" or "_udp"). // Similarly, when using ConvertDomainNameToCString, the target buffer must be MAX_ESCAPED_DOMAIN_NAME (1009) bytes long. // See definitions of MAX_ESCAPED_DOMAIN_LABEL and MAX_ESCAPED_DOMAIN_NAME for more detailed explanation. extern char *ConvertDomainLabelToCString_withescape(const domainlabel *const name, char *cstr, char esc); #define ConvertDomainLabelToCString_unescaped(D,C) ConvertDomainLabelToCString_withescape((D), (C), 0) #define ConvertDomainLabelToCString(D,C) ConvertDomainLabelToCString_withescape((D), (C), '\\') extern char *ConvertDomainNameToCString_withescape(const domainname *const name, char *cstr, char esc); #define ConvertDomainNameToCString_unescaped(D,C) ConvertDomainNameToCString_withescape((D), (C), 0) #define ConvertDomainNameToCString(D,C) ConvertDomainNameToCString_withescape((D), (C), '\\') extern void ConvertUTF8PstringToRFC1034HostLabel(const mDNSu8 UTF8Name[], domainlabel *const hostlabel); extern mDNSu8 *ConstructServiceName(domainname *const fqdn, const domainlabel *name, const domainname *type, const domainname *const domain); extern mDNSBool DeconstructServiceName(const domainname *const fqdn, domainlabel *const name, domainname *const type, domainname *const domain); // Note: Some old functions have been replaced by more sensibly-named versions. // You can uncomment the hash-defines below if you don't want to have to change your source code right away. // When updating your code, note that (unlike the old versions) *all* the new routines take the target object // as their first parameter. //#define ConvertCStringToDomainName(SRC,DST) MakeDomainNameFromDNSNameString((DST),(SRC)) //#define ConvertCStringToDomainLabel(SRC,DST) MakeDomainLabelFromLiteralString((DST),(SRC)) //#define AppendStringLabelToName(DST,SRC) AppendLiteralLabelString((DST),(SRC)) //#define AppendStringNameToName(DST,SRC) AppendDNSNameString((DST),(SRC)) //#define AppendDomainLabelToName(DST,SRC) AppendDomainLabel((DST),(SRC)) //#define AppendDomainNameToName(DST,SRC) AppendDomainName((DST),(SRC)) // *************************************************************************** // mDNS_vsnprintf/snprintf return the number of characters written, excluding the final terminating null. // The output is always null-terminated: for example, if the output turns out to be exactly buflen long, // then the output will be truncated by one character to allow space for the terminating null. // Unlike standard C vsnprintf/snprintf, they return the number of characters *actually* written, // not the number of characters that *would* have been printed were buflen unlimited. extern mDNSu32 mDNS_vsnprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, va_list arg); extern mDNSu32 mDNS_snprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, ...) IS_A_PRINTF_STYLE_FUNCTION(3, 4); extern mDNSu32 NumCacheRecordsForInterfaceID(const mDNS *const m, mDNSInterfaceID id); extern char *DNSTypeName(mDNSu16 rrtype); extern char *GetRRDisplayString_rdb(const ResourceRecord *const rr, const RDataBody *const rd1, char *const buffer); #define RRDisplayString(m, rr) GetRRDisplayString_rdb(rr, &(rr)->rdata->u, (m)->MsgBuffer) #define ARDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer) #define CRDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer) extern mDNSBool mDNSSameAddress(const mDNSAddr *ip1, const mDNSAddr *ip2); extern void IncrementLabelSuffix(domainlabel *name, mDNSBool RichText); extern mDNSBool mDNSv4AddrIsRFC1918(mDNSv4Addr *addr); // returns true for RFC1918 private addresses #define mDNSAddrIsRFC1918(X) ((X)->type == mDNSAddrType_IPv4 && mDNSv4AddrIsRFC1918(&(X)->ip.v4)) #define mDNSSameIPPort(A,B) ((A).NotAnInteger == (B).NotAnInteger) #define mDNSSameOpaque16(A,B) ((A).NotAnInteger == (B).NotAnInteger) #define mDNSSameOpaque32(A,B) ((A).NotAnInteger == (B).NotAnInteger) #define mDNSSameOpaque64(A,B) ((A)->l[0] == (B)->l[0] && (A)->l[1] == (B)->l[1]) #define mDNSSameIPv4Address(A,B) ((A).NotAnInteger == (B).NotAnInteger) #define mDNSSameIPv6Address(A,B) ((A).l[0] == (B).l[0] && (A).l[1] == (B).l[1] && (A).l[2] == (B).l[2] && (A).l[3] == (B).l[3]) #define mDNSSameEthAddress(A,B) ((A)->w[0] == (B)->w[0] && (A)->w[1] == (B)->w[1] && (A)->w[2] == (B)->w[2]) #define mDNSIPPortIsZero(A) ((A).NotAnInteger == 0) #define mDNSOpaque16IsZero(A) ((A).NotAnInteger == 0) #define mDNSOpaque64IsZero(A) (((A)->l[0] | (A)->l[1] ) == 0) #define mDNSIPv4AddressIsZero(A) ((A).NotAnInteger == 0) #define mDNSIPv6AddressIsZero(A) (((A).l[0] | (A).l[1] | (A).l[2] | (A).l[3]) == 0) #define mDNSEthAddressIsZero(A) (((A).w[0] | (A).w[1] | (A).w[2] ) == 0) #define mDNSIPv4AddressIsOnes(A) ((A).NotAnInteger == 0xFFFFFFFF) #define mDNSIPv6AddressIsOnes(A) (((A).l[0] & (A).l[1] & (A).l[2] & (A).l[3]) == 0xFFFFFFFF) #define mDNSAddressIsAllDNSLinkGroup(X) ( \ ((X)->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address((X)->ip.v4, AllDNSLinkGroup_v4.ip.v4)) || \ ((X)->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address((X)->ip.v6, AllDNSLinkGroup_v6.ip.v6)) ) #define mDNSAddressIsZero(X) ( \ ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsZero((X)->ip.v4)) || \ ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsZero((X)->ip.v6)) ) #define mDNSAddressIsValidNonZero(X) ( \ ((X)->type == mDNSAddrType_IPv4 && !mDNSIPv4AddressIsZero((X)->ip.v4)) || \ ((X)->type == mDNSAddrType_IPv6 && !mDNSIPv6AddressIsZero((X)->ip.v6)) ) #define mDNSAddressIsOnes(X) ( \ ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsOnes((X)->ip.v4)) || \ ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsOnes((X)->ip.v6)) ) #define mDNSAddressIsValid(X) ( \ ((X)->type == mDNSAddrType_IPv4) ? !(mDNSIPv4AddressIsZero((X)->ip.v4) || mDNSIPv4AddressIsOnes((X)->ip.v4)) : \ ((X)->type == mDNSAddrType_IPv6) ? !(mDNSIPv6AddressIsZero((X)->ip.v6) || mDNSIPv6AddressIsOnes((X)->ip.v6)) : mDNSfalse) #define mDNSv4AddressIsLinkLocal(X) ((X)->b[0] == 169 && (X)->b[1] == 254) #define mDNSv6AddressIsLinkLocal(X) ((X)->b[0] == 0xFE && ((X)->b[1] & 0xC0) == 0x80) #define mDNSAddressIsLinkLocal(X) ( \ ((X)->type == mDNSAddrType_IPv4) ? mDNSv4AddressIsLinkLocal(&(X)->ip.v4) : \ ((X)->type == mDNSAddrType_IPv6) ? mDNSv6AddressIsLinkLocal(&(X)->ip.v6) : mDNSfalse) #define mDNSv4AddressIsLoopback(X) ((X)->b[0] == 127 && (X)->b[1] == 0 && (X)->b[2] == 0 && (X)->b[3] == 1) #define mDNSv6AddressIsLoopback(X) ((((X)->l[0] | (X)->l[1] | (X)->l[2]) == 0) && ((X)->b[12] == 0 && (X)->b[13] == 0 && (X)->b[14] == 0 && (X)->b[15] == 1)) // *************************************************************************** #if 0 #pragma mark - #pragma mark - Authentication Support #endif // Unicast DNS and Dynamic Update specific Client Calls // // mDNS_SetSecretForDomain tells the core to authenticate (via TSIG with an HMAC_MD5 hash of the shared secret) // when dynamically updating a given zone (and its subdomains). The key used in authentication must be in // domain name format. The shared secret must be a null-terminated base64 encoded string. A minimum size of // 16 bytes (128 bits) is recommended for an MD5 hash as per RFC 2485. // Calling this routine multiple times for a zone replaces previously entered values. Call with a NULL key // to disable authentication for the zone. A non-NULL autoTunnelPrefix means this is an AutoTunnel domain, // and the value is prepended to the IPSec identifier (used for key lookup) extern mStatus mDNS_SetSecretForDomain(mDNS *m, DomainAuthInfo *info, const domainname *domain, const domainname *keyname, const char *b64keydata, const domainname *hostname, mDNSIPPort *port, const char *autoTunnelPrefix); extern void RecreateNATMappings(mDNS *const m); // Hostname/Unicast Interface Configuration // All hostnames advertised point to one IPv4 address and/or one IPv6 address, set via SetPrimaryInterfaceInfo. Invoking this routine // updates all existing hostnames to point to the new address. // A hostname is added via AddDynDNSHostName, which points to the primary interface's v4 and/or v6 addresss // The status callback is invoked to convey success or failure codes - the callback should not modify the AuthRecord or free memory. // Added hostnames may be removed (deregistered) via mDNS_RemoveDynDNSHostName. // Host domains added prior to specification of the primary interface address and computer name will be deferred until // these values are initialized. // DNS servers used to resolve unicast queries are specified by mDNS_AddDNSServer. // For "split" DNS configurations, in which queries for different domains are sent to different servers (e.g. VPN and external), // a domain may be associated with a DNS server. For standard configurations, specify the root label (".") or NULL. extern void mDNS_AddDynDNSHostName(mDNS *m, const domainname *fqdn, mDNSRecordCallback *StatusCallback, const void *StatusContext); extern void mDNS_RemoveDynDNSHostName(mDNS *m, const domainname *fqdn); extern void mDNS_SetPrimaryInterfaceInfo(mDNS *m, const mDNSAddr *v4addr, const mDNSAddr *v6addr, const mDNSAddr *router); extern DNSServer *mDNS_AddDNSServer(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, const mDNSAddr *addr, const mDNSIPPort port, mDNSBool scoped, mDNSu32 timeout, mDNSBool cellIntf); extern void PenalizeDNSServer(mDNS *const m, DNSQuestion *q); extern void mDNS_AddSearchDomain(const domainname *const domain, mDNSInterfaceID InterfaceID); extern McastResolver *mDNS_AddMcastResolver(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, mDNSu32 timeout); // We use ((void *)0) here instead of mDNSNULL to avoid compile warnings on gcc 4.2 #define mDNS_AddSearchDomain_CString(X, I) \ do { domainname d__; if (((X) != (void*)0) && MakeDomainNameFromDNSNameString(&d__, (X)) && d__.c[0]) mDNS_AddSearchDomain(&d__, I); } while(0) // Routines called by the core, exported by DNSDigest.c // Convert an arbitrary base64 encoded key key into an HMAC key (stored in AuthInfo struct) extern mDNSs32 DNSDigest_ConstructHMACKeyfromBase64(DomainAuthInfo *info, const char *b64key); // sign a DNS message. The message must be complete, with all values in network byte order. end points to the end // of the message, and is modified by this routine. numAdditionals is a pointer to the number of additional // records in HOST byte order, which is incremented upon successful completion of this routine. The function returns // the new end pointer on success, and NULL on failure. extern void DNSDigest_SignMessage(DNSMessage *msg, mDNSu8 **end, DomainAuthInfo *info, mDNSu16 tcode); #define SwapDNSHeaderBytes(M) do { \ (M)->h.numQuestions = (mDNSu16)((mDNSu8 *)&(M)->h.numQuestions )[0] << 8 | ((mDNSu8 *)&(M)->h.numQuestions )[1]; \ (M)->h.numAnswers = (mDNSu16)((mDNSu8 *)&(M)->h.numAnswers )[0] << 8 | ((mDNSu8 *)&(M)->h.numAnswers )[1]; \ (M)->h.numAuthorities = (mDNSu16)((mDNSu8 *)&(M)->h.numAuthorities)[0] << 8 | ((mDNSu8 *)&(M)->h.numAuthorities)[1]; \ (M)->h.numAdditionals = (mDNSu16)((mDNSu8 *)&(M)->h.numAdditionals)[0] << 8 | ((mDNSu8 *)&(M)->h.numAdditionals)[1]; \ } while (0) #define DNSDigest_SignMessageHostByteOrder(M,E,INFO) \ do { SwapDNSHeaderBytes(M); DNSDigest_SignMessage((M), (E), (INFO), 0); SwapDNSHeaderBytes(M); } while (0) // verify a DNS message. The message must be complete, with all values in network byte order. end points to the // end of the record. tsig is a pointer to the resource record that contains the TSIG OPT record. info is // the matching key to use for verifying the message. This function expects that the additionals member // of the DNS message header has already had one subtracted from it. extern mDNSBool DNSDigest_VerifyMessage(DNSMessage *msg, mDNSu8 *end, LargeCacheRecord *tsig, DomainAuthInfo *info, mDNSu16 *rcode, mDNSu16 *tcode); // *************************************************************************** // This section defines the interface to the Platform Support layer. // Normal client code should not use any of types defined here, or directly call any of the functions defined here. // The definitions are placed here because sometimes clients do use these calls indirectly, via other supported client operations. // For example, AssignDomainName is a macro defined using mDNSPlatformMemCopy() // Every platform support module must provide the following functions. // mDNSPlatformInit() typically opens a communication endpoint, and starts listening for mDNS packets. // When Setup is complete, the platform support layer calls mDNSCoreInitComplete(). // mDNSPlatformSendUDP() sends one UDP packet // When a packet is received, the PlatformSupport code calls mDNSCoreReceive() // mDNSPlatformClose() tidies up on exit // // Note: mDNSPlatformMemAllocate/mDNSPlatformMemFree are only required for handling oversized resource records and unicast DNS. // If your target platform has a well-defined specialized application, and you know that all the records it uses // are InlineCacheRDSize or less, then you can just make a simple mDNSPlatformMemAllocate() stub that always returns // NULL. InlineCacheRDSize is a compile-time constant, which is set by default to 68. If you need to handle records // a little larger than this and you don't want to have to implement run-time allocation and freeing, then you // can raise the value of this constant to a suitable value (at the expense of increased memory usage). // // USE CAUTION WHEN CALLING mDNSPlatformRawTime: The m->timenow_adjust correction factor needs to be added // Generally speaking: // Code that's protected by the main mDNS lock should just use the m->timenow value // Code outside the main mDNS lock should use mDNS_TimeNow(m) to get properly adjusted time // In certain cases there may be reasons why it's necessary to get the time without taking the lock first // (e.g. inside the routines that are doing the locking and unlocking, where a call to get the lock would result in a // recursive loop); in these cases use mDNS_TimeNow_NoLock(m) to get mDNSPlatformRawTime with the proper correction factor added. // // mDNSPlatformUTC returns the time, in seconds, since Jan 1st 1970 UTC and is required for generating TSIG records extern mStatus mDNSPlatformInit(mDNS *const m); extern void mDNSPlatformClose(mDNS *const m); extern mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport); extern void mDNSPlatformLock(const mDNS *const m); extern void mDNSPlatformUnlock(const mDNS *const m); extern void mDNSPlatformStrCopy(void *dst, const void *src); extern mDNSu32 mDNSPlatformStrLen(const void *src); extern void mDNSPlatformMemCopy(void *dst, const void *src, mDNSu32 len); extern mDNSBool mDNSPlatformMemSame(const void *dst, const void *src, mDNSu32 len); extern void mDNSPlatformMemZero(void *dst, mDNSu32 len); #if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING #define mDNSPlatformMemAllocate(X) mallocL(#X, X) #else extern void *mDNSPlatformMemAllocate(mDNSu32 len); #endif extern void mDNSPlatformMemFree(void *mem); #define _PLATFORM_HAS_STRONG_PRNG_ 1 //modify // If the platform doesn't have a strong PRNG, we define a naive multiply-and-add based on a seed // from the platform layer. Long-term, we should embed an arc4 implementation, but the strength // will still depend on the randomness of the seed. #if !defined(_PLATFORM_HAS_STRONG_PRNG_) && (_BUILDING_XCODE_PROJECT_ || defined(_WIN32)) #define _PLATFORM_HAS_STRONG_PRNG_ 1 #endif #if _PLATFORM_HAS_STRONG_PRNG_ extern mDNSu32 mDNSPlatformRandomNumber(void); #else extern mDNSu32 mDNSPlatformRandomSeed(void); #endif // _PLATFORM_HAS_STRONG_PRNG_ extern mStatus mDNSPlatformTimeInit(void); extern mDNSs32 mDNSPlatformRawTime(void); extern mDNSs32 mDNSPlatformUTC(void); #define mDNS_TimeNow_NoLock(m) (mDNSPlatformRawTime() + (m)->timenow_adjust) #if MDNS_DEBUGMSGS extern void mDNSPlatformWriteDebugMsg(const char *msg); #endif extern void mDNSPlatformWriteLogMsg(const char *ident, const char *msg, mDNSLogLevel_t loglevel); #if APPLE_OSX_mDNSResponder // Utility function for ASL logging mDNSexport void mDNSASLLog(uuid_t *uuid, const char *subdomain, const char *result, const char *signature, const char *fmt, ...); #endif // Platform support modules should provide the following functions to map between opaque interface IDs // and interface indexes in order to support the DNS-SD API. If your target platform does not support // multiple interfaces and/or does not support the DNS-SD API, these functions can be empty. extern mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 ifindex); extern mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange); // Every platform support module must provide the following functions if it is to support unicast DNS // and Dynamic Update. // All TCP socket operations implemented by the platform layer MUST NOT BLOCK. // mDNSPlatformTCPConnect initiates a TCP connection with a peer, adding the socket descriptor to the // main event loop. The return value indicates whether the connection succeeded, failed, or is pending // (i.e. the call would block.) On return, the descriptor parameter is set to point to the connected socket. // The TCPConnectionCallback is subsequently invoked when the connection // completes (in which case the ConnectionEstablished parameter is true), or data is available for // reading on the socket (indicated by the ConnectionEstablished parameter being false.) If the connection // asynchronously fails, the TCPConnectionCallback should be invoked as usual, with the error being // returned in subsequent calls to PlatformReadTCP or PlatformWriteTCP. (This allows for platforms // with limited asynchronous error detection capabilities.) PlatformReadTCP and PlatformWriteTCP must // return the number of bytes read/written, 0 if the call would block, and -1 if an error. PlatformReadTCP // should set the closed argument if the socket has been closed. // PlatformTCPCloseConnection must close the connection to the peer and remove the descriptor from the // event loop. CloseConnectin may be called at any time, including in a ConnectionCallback. typedef enum { kTCPSocketFlags_Zero = 0, kTCPSocketFlags_UseTLS = (1 << 0) } TCPSocketFlags; typedef void (*TCPConnectionCallback)(TCPSocket *sock, void *context, mDNSBool ConnectionEstablished, mStatus err); extern TCPSocket *mDNSPlatformTCPSocket(mDNS *const m, TCPSocketFlags flags, mDNSIPPort *port); // creates a TCP socket extern TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd); extern int mDNSPlatformTCPGetFD(TCPSocket *sock); extern mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname, mDNSInterfaceID InterfaceID, TCPConnectionCallback callback, void *context); extern void mDNSPlatformTCPCloseConnection(TCPSocket *sock); extern long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool *closed); extern long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len); extern UDPSocket *mDNSPlatformUDPSocket(mDNS *const m, const mDNSIPPort requestedport); extern void mDNSPlatformUDPClose(UDPSocket *sock); extern void mDNSPlatformReceiveBPF_fd(mDNS *const m, int fd); extern void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID); extern void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID); extern void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID); extern void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst); // mDNSPlatformTLSSetupCerts/mDNSPlatformTLSTearDownCerts used by dnsextd extern mStatus mDNSPlatformTLSSetupCerts(void); extern void mDNSPlatformTLSTearDownCerts(void); // Platforms that support unicast browsing and dynamic update registration for clients who do not specify a domain // in browse/registration calls must implement these routines to get the "default" browse/registration list. extern void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains); extern mStatus mDNSPlatformGetPrimaryInterface(mDNS *const m, mDNSAddr *v4, mDNSAddr *v6, mDNSAddr *router); extern void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status); extern void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason); extern void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration); extern mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf); #ifdef _LEGACY_NAT_TRAVERSAL_ // Support for legacy NAT traversal protocols, implemented by the platform layer and callable by the core. extern void LNT_SendDiscoveryMsg(mDNS *m); extern void LNT_ConfigureRouterInfo(mDNS *m, const mDNSInterfaceID InterfaceID, const mDNSu8 *const data, const mDNSu16 len); extern mStatus LNT_GetExternalAddress(mDNS *m); extern mStatus LNT_MapPort(mDNS *m, NATTraversalInfo *const n); extern mStatus LNT_UnmapPort(mDNS *m, NATTraversalInfo *const n); extern void LNT_ClearState(mDNS *const m); #endif // _LEGACY_NAT_TRAVERSAL_ // The core mDNS code provides these functions, for the platform support code to call at appropriate times // // mDNS_SetFQDN() is called once on startup (typically from mDNSPlatformInit()) // and then again on each subsequent change of the host name. // // mDNS_RegisterInterface() is used by the platform support layer to inform mDNSCore of what // physical and/or logical interfaces are available for sending and receiving packets. // Typically it is called on startup for each available interface, but register/deregister may be // called again later, on multiple occasions, to inform the core of interface configuration changes. // If set->Advertise is set non-zero, then mDNS_RegisterInterface() also registers the standard // resource records that should be associated with every publicised IP address/interface: // -- Name-to-address records (A/AAAA) // -- Address-to-name records (PTR) // -- Host information (HINFO) // IMPORTANT: The specified mDNSInterfaceID MUST NOT be 0, -1, or -2; these values have special meaning // mDNS_RegisterInterface does not result in the registration of global hostnames via dynamic update - // see mDNS_SetPrimaryInterfaceInfo, mDNS_AddDynDNSHostName, etc. for this purpose. // Note that the set may be deallocated immediately after it is deregistered via mDNS_DeegisterInterface. // // mDNS_RegisterDNS() is used by the platform support layer to provide the core with the addresses of // available domain name servers for unicast queries/updates. RegisterDNS() should be called once for // each name server, typically at startup, or when a new name server becomes available. DeregiterDNS() // must be called whenever a registered name server becomes unavailable. DeregisterDNSList deregisters // all registered servers. mDNS_DNSRegistered() returns true if one or more servers are registered in the core. // // mDNSCoreInitComplete() is called when the platform support layer is finished. // Typically this is at the end of mDNSPlatformInit(), but may be later // (on platforms like OT that allow asynchronous initialization of the networking stack). // // mDNSCoreReceive() is called when a UDP packet is received // // mDNSCoreMachineSleep() is called when the machine sleeps or wakes // (This refers to heavyweight laptop-style sleep/wake that disables network access, // not lightweight second-by-second CPU power management modes.) extern void mDNS_SetFQDN(mDNS *const m); extern void mDNS_ActivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set); extern void mDNS_DeactivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set); extern mStatus mDNS_RegisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping); extern void mDNS_DeregisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping); extern void mDNSCoreInitComplete(mDNS *const m, mStatus result); extern void mDNSCoreReceive(mDNS *const m, void *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, const mDNSIPPort dstport, const mDNSInterfaceID InterfaceID); extern void mDNSCoreRestartQueries(mDNS *const m); typedef void (*FlushCache)(mDNS *const m); typedef void (*CallbackBeforeStartQuery)(mDNS *const m, void *context); extern void mDNSCoreRestartAddressQueries(mDNS *const m, mDNSBool SearchDomainsChanged, FlushCache flushCacheRecords, CallbackBeforeStartQuery beforeQueryStart, void *context); extern mDNSBool mDNSCoreHaveAdvertisedMulticastServices(mDNS *const m); extern void mDNSCoreMachineSleep(mDNS *const m, mDNSBool wake); extern mDNSBool mDNSCoreReadyForSleep(mDNS *m, mDNSs32 now); extern mDNSs32 mDNSCoreIntervalToNextWake(mDNS *const m, mDNSs32 now); extern void mDNSCoreReceiveRawPacket(mDNS *const m, const mDNSu8 *const p, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID); extern mDNSBool mDNSAddrIsDNSMulticast(const mDNSAddr *ip); extern CacheRecord *CreateNewCacheEntry(mDNS *const m, const mDNSu32 slot, CacheGroup *cg, mDNSs32 delay); extern void ScheduleNextCacheCheckTime(mDNS *const m, const mDNSu32 slot, const mDNSs32 event); extern void GrantCacheExtensions(mDNS *const m, DNSQuestion *q, mDNSu32 lease); extern void MakeNegativeCacheRecord(mDNS *const m, CacheRecord *const cr, const domainname *const name, const mDNSu32 namehash, const mDNSu16 rrtype, const mDNSu16 rrclass, mDNSu32 ttl_seconds, mDNSInterfaceID InterfaceID, DNSServer *dnsserver); extern void CompleteDeregistration(mDNS *const m, AuthRecord *rr); extern void AnswerCurrentQuestionWithResourceRecord(mDNS *const m, CacheRecord *const rr, const QC_result AddRecord); extern char *InterfaceNameForID(mDNS *const m, const mDNSInterfaceID InterfaceID); extern void DNSServerChangeForQuestion(mDNS *const m, DNSQuestion *q, DNSServer *newServer); extern void ActivateUnicastRegistration(mDNS *const m, AuthRecord *const rr); extern void CheckSuppressUnusableQuestions(mDNS *const m); extern void RetrySearchDomainQuestions(mDNS *const m); extern mDNSBool DomainEnumQuery(const domainname *qname); // Used only in logging to restrict the number of /etc/hosts entries printed extern void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result); // exported for using the hash for /etc/hosts AuthRecords extern AuthGroup *AuthGroupForName(AuthHash *r, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name); extern AuthGroup *AuthGroupForRecord(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr); extern AuthGroup *InsertAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr); extern AuthGroup *RemoveAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr); // For now this AutoTunnel stuff is specific to Mac OS X. // In the future, if there's demand, we may see if we can abstract it out cleanly into the platform layer #if APPLE_OSX_mDNSResponder extern void AutoTunnelCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord); extern void AddNewClientTunnel(mDNS *const m, DNSQuestion *const q); extern void SetupLocalAutoTunnelInterface_internal(mDNS *const m, mDNSBool servicesStarting); extern void UpdateAutoTunnelDomainStatuses(const mDNS *const m); extern mStatus ActivateLocalProxy(mDNS *const m, char *ifname); extern void RemoveAutoTunnel6Record(mDNS *const m); extern mDNSBool RecordReadyForSleep(mDNS *const m, AuthRecord *rr); #endif // *************************************************************************** #if 0 #pragma mark - #pragma mark - Sleep Proxy #endif // Sleep Proxy Server Property Encoding // // Sleep Proxy Servers are advertised using a structured service name, consisting of four // metrics followed by a human-readable name. The metrics assist clients in deciding which // Sleep Proxy Server(s) to use when multiple are available on the network. Each metric // is a two-digit decimal number in the range 10-99. Lower metrics are generally better. // // AA-BB-CC-DD Name // // Metrics: // // AA = Intent // BB = Portability // CC = Marginal Power // DD = Total Power // // // ** Intent Metric ** // // 20 = Dedicated Sleep Proxy Server -- a device, permanently powered on, // installed for the express purpose of providing Sleep Proxy Service. // // 30 = Primary Network Infrastructure Hardware -- a router, DHCP server, NAT gateway, // or similar permanently installed device which is permanently powered on. // This is hardware designed for the express purpose of being network // infrastructure, and for most home users is typically a single point // of failure for the local network -- e.g. most home users only have // a single NAT gateway / DHCP server. Even though in principle the // hardware might technically be capable of running different software, // a typical user is unlikely to do that. e.g. AirPort base station. // // 40 = Primary Network Infrastructure Software -- a general-purpose computer // (e.g. Mac, Windows, Linux, etc.) which is currently running DHCP server // or NAT gateway software, but the user could choose to turn that off // fairly easily. e.g. iMac running Internet Sharing // // 50 = Secondary Network Infrastructure Hardware -- like primary infrastructure // hardware, except not a single point of failure for the entire local network. // For example, an AirPort base station in bridge mode. This may have clients // associated with it, and if it goes away those clients will be inconvenienced, // but unlike the NAT gateway / DHCP server, the entire local network is not // dependent on it. // // 60 = Secondary Network Infrastructure Software -- like 50, but in a general- // purpose CPU. // // 70 = Incidentally Available Hardware -- a device which has no power switch // and is generally left powered on all the time. Even though it is not a // part of what we conventionally consider network infrastructure (router, // DHCP, NAT, DNS, etc.), and the rest of the network can operate fine // without it, since it's available and unlikely to be turned off, it is a // reasonable candidate for providing Sleep Proxy Service e.g. Apple TV, // or an AirPort base station in client mode, associated with an existing // wireless network (e.g. AirPort Express connected to a music system, or // being used to share a USB printer). // // 80 = Incidentally Available Software -- a general-purpose computer which // happens at this time to be set to "never sleep", and as such could be // useful as a Sleep Proxy Server, but has not been intentionally provided // for this purpose. Of all the Intent Metric categories this is the // one most likely to be shut down or put to sleep without warning. // However, if nothing else is availalable, it may be better than nothing. // e.g. Office computer in the workplace which has been set to "never sleep" // // // ** Portability Metric ** // // Inversely related to mass of device, on the basis that, all other things // being equal, heavier devices are less likely to be moved than lighter devices. // E.g. A MacBook running Internet Sharing is probably more likely to be // put to sleep and taken away than a Mac Pro running Internet Sharing. // The Portability Metric is a logarithmic decibel scale, computed by taking the // (approximate) mass of the device in milligrammes, taking the base 10 logarithm // of that, multiplying by 10, and subtracting the result from 100: // // Portability Metric = 100 - (log10(mg) * 10) // // The Portability Metric is not necessarily computed literally from the actual // mass of the device; the intent is just that lower numbers indicate more // permanent devices, and higher numbers indicate devices more likely to be // removed from the network, e.g., in order of increasing portability: // // Mac Pro < iMac < Laptop < iPhone // // Example values: // // 10 = 1 metric tonne // 40 = 1kg // 70 = 1g // 90 = 10mg // // // ** Marginal Power and Total Power Metrics ** // // The Marginal Power Metric is the power difference between sleeping and staying awake // to be a Sleep Proxy Server. // // The Total Power Metric is the total power consumption when being Sleep Proxy Server. // // The Power Metrics use a logarithmic decibel scale, computed as ten times the // base 10 logarithm of the (approximate) power in microwatts: // // Power Metric = log10(uW) * 10 // // Higher values indicate higher power consumption. Example values: // // 10 = 10 uW // 20 = 100 uW // 30 = 1 mW // 60 = 1 W // 90 = 1 kW typedef enum { mDNSSleepProxyMetric_Dedicated = 20, mDNSSleepProxyMetric_PrimaryHardware = 30, mDNSSleepProxyMetric_PrimarySoftware = 40, mDNSSleepProxyMetric_SecondaryHardware = 50, mDNSSleepProxyMetric_SecondarySoftware = 60, mDNSSleepProxyMetric_IncidentalHardware = 70, mDNSSleepProxyMetric_IncidentalSoftware = 80 } mDNSSleepProxyMetric; extern void mDNSCoreBeSleepProxyServer_internal(mDNS *const m, mDNSu8 sps, mDNSu8 port, mDNSu8 marginalpower, mDNSu8 totpower); #define mDNSCoreBeSleepProxyServer(M,S,P,MP,TP) \ do { mDNS_Lock(m); mDNSCoreBeSleepProxyServer_internal((M),(S),(P),(MP),(TP)); mDNS_Unlock(m); } while(0) extern void FindSPSInCache(mDNS *const m, const DNSQuestion *const q, const CacheRecord *sps[3]); #define PrototypeSPSName(X) ((X)[0] >= 11 && (X)[3] == '-' && (X)[ 4] == '9' && (X)[ 5] == '9' && \ (X)[6] == '-' && (X)[ 7] == '9' && (X)[ 8] == '9' && \ (X)[9] == '-' && (X)[10] == '9' && (X)[11] == '9' ) #define ValidSPSName(X) ((X)[0] >= 5 && mDNSIsDigit((X)[1]) && mDNSIsDigit((X)[2]) && mDNSIsDigit((X)[4]) && mDNSIsDigit((X)[5])) #define SPSMetric(X) (!ValidSPSName(X) || PrototypeSPSName(X) ? 1000000 : \ ((X)[1]-'0') * 100000 + ((X)[2]-'0') * 10000 + ((X)[4]-'0') * 1000 + ((X)[5]-'0') * 100 + ((X)[7]-'0') * 10 + ((X)[8]-'0')) // *************************************************************************** // Some C compiler cleverness. We can make the compiler check certain things for // us, and report compile-time errors if anything is wrong. The usual way to do // this would be to use a run-time "if" statement, but then you don't find out // what's wrong until you run the software. This way, if the assertion condition // is false, the array size is negative, and the complier complains immediately. struct CompileTimeAssertionChecks_mDNS { // Check that the compiler generated our on-the-wire packet format structure definitions // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries. char assert0[(sizeof(rdataSRV) == 262) ? 1 : -1]; char assert1[(sizeof(DNSMessageHeader) == 12) ? 1 : -1]; char assert2[(sizeof(DNSMessage) == 12 + AbsoluteMaxDNSMessageData) ? 1 : -1]; char assert3[(sizeof(mDNSs8) == 1) ? 1 : -1]; char assert4[(sizeof(mDNSu8) == 1) ? 1 : -1]; char assert5[(sizeof(mDNSs16) == 2) ? 1 : -1]; char assert6[(sizeof(mDNSu16) == 2) ? 1 : -1]; char assert7[(sizeof(mDNSs32) == 4) ? 1 : -1]; char assert8[(sizeof(mDNSu32) == 4) ? 1 : -1]; char assert9[(sizeof(mDNSOpaque16) == 2) ? 1 : -1]; char assertA[(sizeof(mDNSOpaque32) == 4) ? 1 : -1]; char assertB[(sizeof(mDNSOpaque128) == 16) ? 1 : -1]; char assertC[(sizeof(CacheRecord) == sizeof(CacheGroup)) ? 1 : -1]; char assertD[(sizeof(int) >= 4) ? 1 : -1]; char assertE[(StandardAuthRDSize >= 256) ? 1 : -1]; char assertF[(sizeof(EthernetHeader) == 14) ? 1 : 0]; char assertG[(sizeof(ARP_EthIP) == 28) ? 1 : 0]; char assertH[(sizeof(IPv4Header) == 20) ? 1 : -1]; char assertI[(sizeof(IPv6Header) == 40) ? 1 : -1]; char assertJ[(sizeof(IPv6NDP) == 24) ? 1 : -1]; char assertK[(sizeof(UDPHeader) == 8) ? 1 : -1]; char assertL[(sizeof(IKEHeader) == 28) ? 1 : -1]; char assertM[(sizeof(TCPHeader) == 20) ? 1 : -1]; // Check our structures are reasonable sizes. Including overly-large buffers, or embedding // other overly-large structures instead of having a pointer to them, can inadvertently // cause structure sizes (and therefore memory usage) to balloon unreasonably. char sizecheck_RDataBody [(sizeof(RDataBody) == 264) ? 1 : -1]; char sizecheck_ResourceRecord [(sizeof(ResourceRecord) <= 64) ? 1 : -1]; char sizecheck_AuthRecord [(sizeof(AuthRecord) <= 1208) ? 1 : -1]; char sizecheck_CacheRecord [(sizeof(CacheRecord) <= 184) ? 1 : -1]; char sizecheck_CacheGroup [(sizeof(CacheGroup) <= 184) ? 1 : -1]; char sizecheck_DNSQuestion [(sizeof(DNSQuestion) <= 786) ? 1 : -1]; char sizecheck_ZoneData [(sizeof(ZoneData) <= 1624) ? 1 : -1]; char sizecheck_NATTraversalInfo [(sizeof(NATTraversalInfo) <= 192) ? 1 : -1]; char sizecheck_HostnameInfo [(sizeof(HostnameInfo) <= 3050) ? 1 : -1]; char sizecheck_DNSServer [(sizeof(DNSServer) <= 328) ? 1 : -1]; char sizecheck_NetworkInterfaceInfo[(sizeof(NetworkInterfaceInfo) <= 6850) ? 1 : -1]; char sizecheck_ServiceRecordSet [(sizeof(ServiceRecordSet) <= 5500) ? 1 : -1]; char sizecheck_DomainAuthInfo [(sizeof(DomainAuthInfo) <= 7808) ? 1 : -1]; char sizecheck_ServiceInfoQuery [(sizeof(ServiceInfoQuery) <= 3200) ? 1 : -1]; #if APPLE_OSX_mDNSResponder char sizecheck_ClientTunnel [(sizeof(ClientTunnel) <= 1148) ? 1 : -1]; #endif }; // *************************************************************************** #endif