14b22b933Srs /* -*- Mode: C; tab-width: 4 -*- 24b22b933Srs * 3*472cd20dSToomas Soome * Copyright (c) 2002-2020 Apple Inc. All rights reserved. 44b22b933Srs * 54b22b933Srs * Licensed under the Apache License, Version 2.0 (the "License"); 64b22b933Srs * you may not use this file except in compliance with the License. 74b22b933Srs * You may obtain a copy of the License at 85ffb0c9bSToomas Soome * 94b22b933Srs * http://www.apache.org/licenses/LICENSE-2.0 105ffb0c9bSToomas Soome * 114b22b933Srs * Unless required by applicable law or agreed to in writing, software 124b22b933Srs * distributed under the License is distributed on an "AS IS" BASIS, 134b22b933Srs * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 144b22b933Srs * See the License for the specific language governing permissions and 154b22b933Srs * limitations under the License. 164b22b933Srs */ 174b22b933Srs 184b22b933Srs #ifndef __DNSCOMMON_H_ 194b22b933Srs #define __DNSCOMMON_H_ 204b22b933Srs 214b22b933Srs #include "mDNSEmbeddedAPI.h" 224b22b933Srs 235ffb0c9bSToomas Soome #ifdef __cplusplus 245ffb0c9bSToomas Soome extern "C" { 254b22b933Srs #endif 264b22b933Srs 275ffb0c9bSToomas Soome //************************************************************************************************************* 285ffb0c9bSToomas Soome // Macros 295ffb0c9bSToomas Soome 305ffb0c9bSToomas Soome // Note: The C preprocessor stringify operator ('#') makes a string from its argument, without macro expansion 315ffb0c9bSToomas Soome // e.g. If "version" is #define'd to be "4", then STRINGIFY_AWE(version) will return the string "version", not "4" 325ffb0c9bSToomas Soome // To expand "version" to its value before making the string, use STRINGIFY(version) instead 335ffb0c9bSToomas Soome #define STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) # s 345ffb0c9bSToomas Soome #define STRINGIFY(s) STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) 354b22b933Srs 364b22b933Srs // *************************************************************************** 374b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 384b22b933Srs #pragma mark - DNS Protocol Constants 394b22b933Srs #endif 404b22b933Srs 414b22b933Srs typedef enum 425ffb0c9bSToomas Soome { 43c65ebfc7SToomas Soome kDNSFlag0_QR_Mask = 0x80, // Query or response? 44c65ebfc7SToomas Soome kDNSFlag0_QR_Query = 0x00, 45c65ebfc7SToomas Soome kDNSFlag0_QR_Response = 0x80, 46c65ebfc7SToomas Soome 47*472cd20dSToomas Soome kDNSFlag0_OP_Mask = 0xF << 3, // Operation type 48*472cd20dSToomas Soome kDNSFlag0_OP_StdQuery = 0x0 << 3, 49*472cd20dSToomas Soome kDNSFlag0_OP_Iquery = 0x1 << 3, 50*472cd20dSToomas Soome kDNSFlag0_OP_Status = 0x2 << 3, 51*472cd20dSToomas Soome kDNSFlag0_OP_Unused3 = 0x3 << 3, 52*472cd20dSToomas Soome kDNSFlag0_OP_Notify = 0x4 << 3, 53*472cd20dSToomas Soome kDNSFlag0_OP_Update = 0x5 << 3, 54*472cd20dSToomas Soome kDNSFlag0_OP_DSO = 0x6 << 3, 555ffb0c9bSToomas Soome 565ffb0c9bSToomas Soome kDNSFlag0_QROP_Mask = kDNSFlag0_QR_Mask | kDNSFlag0_OP_Mask, 575ffb0c9bSToomas Soome 585ffb0c9bSToomas Soome kDNSFlag0_AA = 0x04, // Authoritative Answer? 595ffb0c9bSToomas Soome kDNSFlag0_TC = 0x02, // Truncated? 605ffb0c9bSToomas Soome kDNSFlag0_RD = 0x01, // Recursion Desired? 615ffb0c9bSToomas Soome kDNSFlag1_RA = 0x80, // Recursion Available? 625ffb0c9bSToomas Soome 635ffb0c9bSToomas Soome kDNSFlag1_Zero = 0x40, // Reserved; must be zero 645ffb0c9bSToomas Soome kDNSFlag1_AD = 0x20, // Authentic Data [RFC 2535] 655ffb0c9bSToomas Soome kDNSFlag1_CD = 0x10, // Checking Disabled [RFC 2535] 665ffb0c9bSToomas Soome 675ffb0c9bSToomas Soome kDNSFlag1_RC_Mask = 0x0F, // Response code 685ffb0c9bSToomas Soome kDNSFlag1_RC_NoErr = 0x00, 695ffb0c9bSToomas Soome kDNSFlag1_RC_FormErr = 0x01, 705ffb0c9bSToomas Soome kDNSFlag1_RC_ServFail = 0x02, 715ffb0c9bSToomas Soome kDNSFlag1_RC_NXDomain = 0x03, 725ffb0c9bSToomas Soome kDNSFlag1_RC_NotImpl = 0x04, 735ffb0c9bSToomas Soome kDNSFlag1_RC_Refused = 0x05, 745ffb0c9bSToomas Soome kDNSFlag1_RC_YXDomain = 0x06, 755ffb0c9bSToomas Soome kDNSFlag1_RC_YXRRSet = 0x07, 765ffb0c9bSToomas Soome kDNSFlag1_RC_NXRRSet = 0x08, 775ffb0c9bSToomas Soome kDNSFlag1_RC_NotAuth = 0x09, 78*472cd20dSToomas Soome kDNSFlag1_RC_NotZone = 0x0A, 79*472cd20dSToomas Soome kDNSFlag1_RC_DSOTypeNI = 0x0B 805ffb0c9bSToomas Soome } DNS_Flags; 814b22b933Srs 824b22b933Srs typedef enum 835ffb0c9bSToomas Soome { 845ffb0c9bSToomas Soome TSIG_ErrBadSig = 16, 855ffb0c9bSToomas Soome TSIG_ErrBadKey = 17, 865ffb0c9bSToomas Soome TSIG_ErrBadTime = 18 875ffb0c9bSToomas Soome } TSIG_ErrorCode; 884b22b933Srs 89c65ebfc7SToomas Soome 904b22b933Srs // *************************************************************************** 914b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 924b22b933Srs #pragma mark - 934b22b933Srs #pragma mark - General Utility Functions 944b22b933Srs #endif 954b22b933Srs 965ffb0c9bSToomas Soome extern NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf); 974b22b933Srs extern mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf); 984b22b933Srs 995ffb0c9bSToomas Soome extern mDNSu32 mDNSRandom(mDNSu32 max); // Returns pseudo-random result from zero to max inclusive 1004b22b933Srs 101*472cd20dSToomas Soome #if !MDNSRESPONDER_SUPPORTS(APPLE, QUERIER) 102*472cd20dSToomas Soome extern mDNSu32 mDNS_GetNextResolverGroupID(void); 103*472cd20dSToomas Soome #endif 104*472cd20dSToomas Soome 1054b22b933Srs // *************************************************************************** 1064b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 1074b22b933Srs #pragma mark - 1084b22b933Srs #pragma mark - Domain Name Utility Functions 1094b22b933Srs #endif 1105ffb0c9bSToomas Soome 1115ffb0c9bSToomas Soome #define mDNSSubTypeLabel "\x04_sub" 1125ffb0c9bSToomas Soome 1135ffb0c9bSToomas Soome #define mDNSIsDigit(X) ((X) >= '0' && (X) <= '9') 1144b22b933Srs #define mDNSIsUpperCase(X) ((X) >= 'A' && (X) <= 'Z') 1154b22b933Srs #define mDNSIsLowerCase(X) ((X) >= 'a' && (X) <= 'z') 1165ffb0c9bSToomas Soome #define mDNSIsLetter(X) (mDNSIsUpperCase(X) || mDNSIsLowerCase(X)) 1173b436d06SToomas Soome 1183b436d06SToomas Soome // We believe we have adequate safeguards to protect against cache poisoning. 1193b436d06SToomas Soome // In the event that someone does find a workable cache poisoning attack, we want to limit the lifetime of the poisoned entry. 1203b436d06SToomas Soome // We set the maximum allowable TTL to one hour. 1213b436d06SToomas Soome // With the 25% correction factor to avoid the DNS Zeno's paradox bug, that gives us an actual maximum lifetime of 75 minutes. 1223b436d06SToomas Soome 123*472cd20dSToomas Soome #define mDNSMaximumMulticastTTLSeconds (mDNSu32)4500 124*472cd20dSToomas Soome #define mDNSMaximumUnicastTTLSeconds (mDNSu32)3600 1255ffb0c9bSToomas Soome 1265ffb0c9bSToomas Soome #define mDNSValidHostChar(X, notfirst, notlast) (mDNSIsLetter(X) || mDNSIsDigit(X) || ((notfirst) && (notlast) && (X) == '-') ) 1274b22b933Srs 1284b22b933Srs extern mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent); 1295ffb0c9bSToomas Soome extern int CountLabels(const domainname *d); 1305ffb0c9bSToomas Soome extern const domainname *SkipLeadingLabels(const domainname *d, int skip); 1314b22b933Srs 1324b22b933Srs extern mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max); 1334b22b933Srs extern mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText); 1344b22b933Srs extern mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText); 1355ffb0c9bSToomas Soome extern void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText); 1364b22b933Srs #define ValidateDomainName(N) (DomainNameLength(N) <= MAX_DOMAIN_NAME) 1374b22b933Srs 1384b22b933Srs // *************************************************************************** 1394b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 1404b22b933Srs #pragma mark - 1414b22b933Srs #pragma mark - Resource Record Utility Functions 1424b22b933Srs #endif 1434b22b933Srs 1445ffb0c9bSToomas Soome // IdenticalResourceRecord returns true if two resources records have 1455ffb0c9bSToomas Soome // the same name, type, class, and identical rdata (InterfaceID and TTL may differ) 1465ffb0c9bSToomas Soome 1475ffb0c9bSToomas Soome // IdenticalSameNameRecord is the same, except it skips the expensive SameDomainName() check, 1485ffb0c9bSToomas Soome // which is at its most expensive and least useful in cases where we know in advance that the names match 1495ffb0c9bSToomas Soome 1505ffb0c9bSToomas Soome // Note: The dominant use of IdenticalResourceRecord is from ProcessQuery(), handling known-answer lists. In this case 1515ffb0c9bSToomas Soome // it's common to have a whole bunch or records with exactly the same name (e.g. "_http._tcp.local") but different RDATA. 1525ffb0c9bSToomas Soome // The SameDomainName() check is expensive when the names match, and in this case *all* the names match, so we 1535ffb0c9bSToomas Soome // used to waste a lot of CPU time verifying that the names match, only then to find that the RDATA is different. 1545ffb0c9bSToomas Soome // We observed mDNSResponder spending 30% of its total CPU time on this single task alone. 1555ffb0c9bSToomas Soome // By swapping the checks so that we check the RDATA first, we can quickly detect when it's different 1565ffb0c9bSToomas Soome // (99% of the time) and then bail out before we waste time on the expensive SameDomainName() check. 1575ffb0c9bSToomas Soome 1585ffb0c9bSToomas Soome #define IdenticalResourceRecord(r1,r2) ( \ 1595ffb0c9bSToomas Soome (r1)->rrtype == (r2)->rrtype && \ 1605ffb0c9bSToomas Soome (r1)->rrclass == (r2)->rrclass && \ 1615ffb0c9bSToomas Soome (r1)->namehash == (r2)->namehash && \ 1625ffb0c9bSToomas Soome (r1)->rdlength == (r2)->rdlength && \ 1635ffb0c9bSToomas Soome (r1)->rdatahash == (r2)->rdatahash && \ 1645ffb0c9bSToomas Soome SameRDataBody((r1), &(r2)->rdata->u, SameDomainName) && \ 1655ffb0c9bSToomas Soome SameDomainName((r1)->name, (r2)->name)) 1665ffb0c9bSToomas Soome 1675ffb0c9bSToomas Soome #define IdenticalSameNameRecord(r1,r2) ( \ 1685ffb0c9bSToomas Soome (r1)->rrtype == (r2)->rrtype && \ 1695ffb0c9bSToomas Soome (r1)->rrclass == (r2)->rrclass && \ 1705ffb0c9bSToomas Soome (r1)->rdlength == (r2)->rdlength && \ 1715ffb0c9bSToomas Soome (r1)->rdatahash == (r2)->rdatahash && \ 1725ffb0c9bSToomas Soome SameRDataBody((r1), &(r2)->rdata->u, SameDomainName)) 1735ffb0c9bSToomas Soome 1745ffb0c9bSToomas Soome // A given RRType answers a QuestionType if RRType is CNAME, or types match, or QuestionType is ANY, 1755ffb0c9bSToomas Soome // or the RRType is NSEC and positively asserts the nonexistence of the type being requested 1765ffb0c9bSToomas Soome #define RRTypeAnswersQuestionType(R,Q) ((R)->rrtype == kDNSType_CNAME || (R)->rrtype == (Q) || (Q) == kDNSQType_ANY || RRAssertsNonexistence((R),(Q))) 1775ffb0c9bSToomas Soome // Unicast NSEC records have the NSEC bit set whereas the multicast NSEC ones don't 1785ffb0c9bSToomas Soome #define UNICAST_NSEC(rr) ((rr)->rrtype == kDNSType_NSEC && RRAssertsExistence((rr), kDNSType_NSEC)) 1795ffb0c9bSToomas Soome 1805ffb0c9bSToomas Soome extern mDNSu32 RDataHashValue(const ResourceRecord *const rr); 1815ffb0c9bSToomas Soome extern mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename); 182*472cd20dSToomas Soome extern mDNSBool SameNameCacheRecordAnswersQuestion(const CacheRecord *const cr, const DNSQuestion *const q); 1834b22b933Srs extern mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q); 184*472cd20dSToomas Soome extern mDNSBool AuthRecordAnswersQuestion(const AuthRecord *const ar, const DNSQuestion *const q); 185*472cd20dSToomas Soome extern mDNSBool CacheRecordAnswersQuestion(const CacheRecord *const cr, const DNSQuestion *const q); 186*472cd20dSToomas Soome extern mDNSBool AnyTypeRecordAnswersQuestion (const AuthRecord *const ar, const DNSQuestion *const q); 1875ffb0c9bSToomas Soome extern mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q); 1885ffb0c9bSToomas Soome extern mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const rr, const DNSQuestion *const q); 1894b22b933Srs extern mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate); 1905ffb0c9bSToomas Soome extern mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd); 1915ffb0c9bSToomas Soome extern mStatus DNSNameToLowerCase(domainname *d, domainname *result); 1924b22b933Srs 1934b22b933Srs #define GetRRDomainNameTarget(RR) ( \ 1945ffb0c9bSToomas Soome ((RR)->rrtype == kDNSType_NS || (RR)->rrtype == kDNSType_CNAME || (RR)->rrtype == kDNSType_PTR || (RR)->rrtype == kDNSType_DNAME) ? &(RR)->rdata->u.name : \ 1955ffb0c9bSToomas Soome ((RR)->rrtype == kDNSType_MX || (RR)->rrtype == kDNSType_AFSDB || (RR)->rrtype == kDNSType_RT || (RR)->rrtype == kDNSType_KX ) ? &(RR)->rdata->u.mx.exchange : \ 1965ffb0c9bSToomas Soome ((RR)->rrtype == kDNSType_SRV ) ? &(RR)->rdata->u.srv.target : mDNSNULL ) 1974b22b933Srs 1985ffb0c9bSToomas Soome #define LocalRecordReady(X) ((X)->resrec.RecordType != kDNSRecordTypeUnique) 1994b22b933Srs 2004b22b933Srs // *************************************************************************** 2014b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 2024b22b933Srs #pragma mark - 2034b22b933Srs #pragma mark - DNS Message Creation Functions 2044b22b933Srs #endif 2054b22b933Srs 2064b22b933Srs extern void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags); 2074b22b933Srs extern const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname); 2084b22b933Srs extern mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name); 2095ffb0c9bSToomas Soome extern mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr); 2104b22b933Srs 2114b22b933Srs // If we have a single large record to put in the packet, then we allow the packet to be up to 9K bytes, 2125ffb0c9bSToomas Soome // but in the normal case we try to keep the packets below 1500 to avoid IP fragmentation on standard Ethernet 2134b22b933Srs 2145ffb0c9bSToomas Soome #define AllowedRRSpace(msg) (((msg)->h.numAnswers || (msg)->h.numAuthorities || (msg)->h.numAdditionals) ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData) 2154b22b933Srs 216*472cd20dSToomas Soome extern mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, const ResourceRecord *rr, 217*472cd20dSToomas Soome mDNSu32 ttl, const mDNSu8 *limit); 2184b22b933Srs 2195ffb0c9bSToomas Soome #define PutResourceRecordTTL(msg, ptr, count, rr, ttl) \ 2205ffb0c9bSToomas Soome PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AllowedRRSpace(msg)) 2214b22b933Srs 2225ffb0c9bSToomas Soome #define PutResourceRecordTTLJumbo(msg, ptr, count, rr, ttl) \ 2235ffb0c9bSToomas Soome PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AbsoluteMaxDNSMessageData) 2244b22b933Srs 2255ffb0c9bSToomas Soome #define PutResourceRecord(MSG, P, C, RR) PutResourceRecordTTL((MSG), (P), (C), (RR), (RR)->rroriginalttl) 2264b22b933Srs 2275ffb0c9bSToomas Soome // The PutRR_OS variants assume a local variable 'm', put build the packet at m->omsg, 2285ffb0c9bSToomas Soome // and assume local variables 'OwnerRecordSpace' & 'TraceRecordSpace' indicating how many bytes (if any) to reserve to add an OWNER/TRACER option at the end 2295ffb0c9bSToomas Soome #define PutRR_OS_TTL(ptr, count, rr, ttl) \ 2305ffb0c9bSToomas Soome PutResourceRecordTTLWithLimit(&m->omsg, (ptr), (count), (rr), (ttl), m->omsg.data + AllowedRRSpace(&m->omsg) - OwnerRecordSpace - TraceRecordSpace) 2314b22b933Srs 2325ffb0c9bSToomas Soome #define PutRR_OS(P, C, RR) PutRR_OS_TTL((P), (C), (RR), (RR)->rroriginalttl) 2334b22b933Srs 2345ffb0c9bSToomas Soome extern mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass); 2355ffb0c9bSToomas Soome extern mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass); 2365ffb0c9bSToomas Soome extern mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end); 2374b22b933Srs extern mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr); 2385ffb0c9bSToomas Soome extern mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit); 2395ffb0c9bSToomas Soome extern mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit); 2404b22b933Srs extern mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name); 241cda73f64SToomas Soome extern mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *ptr, mDNSu32 lease); 2425ffb0c9bSToomas Soome extern mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *ptr, mDNSu32 lease, mDNSu8 *limit); 2435ffb0c9bSToomas Soome 2445ffb0c9bSToomas Soome extern int baseEncode(char *buffer, int blen, const mDNSu8 *data, int len, int encAlg); 2455ffb0c9bSToomas Soome extern void NSEC3Parse(const ResourceRecord *const rr, mDNSu8 **salt, int *hashLength, mDNSu8 **nxtName, int *bitmaplen, mDNSu8 **bitmap); 2464b22b933Srs 2474b22b933Srs // *************************************************************************** 2484b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 2494b22b933Srs #pragma mark - 2504b22b933Srs #pragma mark - DNS Message Parsing Functions 2514b22b933Srs #endif 2524b22b933Srs 253c65ebfc7SToomas Soome #define HashSlotFromNameHash(X) ((X) % CACHE_HASH_SLOTS) 2544b22b933Srs extern mDNSu32 DomainNameHashValue(const domainname *const name); 2554b22b933Srs extern void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength); 2564b22b933Srs extern const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end); 2574b22b933Srs extern const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, 2585ffb0c9bSToomas Soome domainname *const name); 2594b22b933Srs extern const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); 2605ffb0c9bSToomas Soome extern const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage * const msg, const mDNSu8 *ptr, 2615ffb0c9bSToomas Soome const mDNSu8 * end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr); 262*472cd20dSToomas Soome extern mDNSBool SetRData(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *end, ResourceRecord *rr, 263*472cd20dSToomas Soome mDNSu16 rdlength); 2644b22b933Srs extern const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); 2654b22b933Srs extern const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID, 2665ffb0c9bSToomas Soome DNSQuestion *question); 2674b22b933Srs extern const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end); 2684b22b933Srs extern const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end); 2694b22b933Srs extern const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end); 2705ffb0c9bSToomas Soome extern const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize); 2715ffb0c9bSToomas Soome extern const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end); 272c65ebfc7SToomas Soome extern mDNSBool GetPktLease(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, mDNSu32 *const lease); 273*472cd20dSToomas Soome extern void DumpPacket(mStatus status, mDNSBool sent, const char *transport, const mDNSAddr *srcaddr, mDNSIPPort srcport, 274*472cd20dSToomas Soome const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end, 275*472cd20dSToomas Soome mDNSInterfaceID interfaceID); 2765ffb0c9bSToomas Soome extern mDNSBool RRAssertsNonexistence(const ResourceRecord *const rr, mDNSu16 type); 2775ffb0c9bSToomas Soome extern mDNSBool RRAssertsExistence(const ResourceRecord *const rr, mDNSu16 type); 2785ffb0c9bSToomas Soome extern mDNSBool BitmapTypeCheck(mDNSu8 *bmap, int bitmaplen, mDNSu16 type); 2795ffb0c9bSToomas Soome 2805ffb0c9bSToomas Soome extern mDNSu16 swap16(mDNSu16 x); 2815ffb0c9bSToomas Soome extern mDNSu32 swap32(mDNSu32 x); 2824b22b933Srs 283*472cd20dSToomas Soome extern mDNSBool GetReverseIPv6Addr(const domainname *inQName, mDNSu8 outIPv6[16]); 284*472cd20dSToomas Soome 2854b22b933Srs // *************************************************************************** 2864b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 2874b22b933Srs #pragma mark - 2884b22b933Srs #pragma mark - Packet Sending Functions 2894b22b933Srs #endif 2905ffb0c9bSToomas Soome extern mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end, 291*472cd20dSToomas Soome mDNSInterfaceID InterfaceID, TCPSocket *tcpSrc, UDPSocket *udpSrc, const mDNSAddr *dst, 292*472cd20dSToomas Soome mDNSIPPort dstport, DomainAuthInfo *authInfo, mDNSBool useBackgroundTrafficClass); 2934b22b933Srs 2944b22b933Srs // *************************************************************************** 2954b22b933Srs #if COMPILER_LIKES_PRAGMA_MARK 2964b22b933Srs #pragma mark - 2974b22b933Srs #pragma mark - RR List Management & Task Management 2984b22b933Srs #endif 2994b22b933Srs 3005ffb0c9bSToomas Soome extern void ShowTaskSchedulingError(mDNS *const m); 3015ffb0c9bSToomas Soome extern void mDNS_Lock_(mDNS *const m, const char * const functionname); 3025ffb0c9bSToomas Soome extern void mDNS_Unlock_(mDNS *const m, const char * const functionname); 303*472cd20dSToomas Soome 3045ffb0c9bSToomas Soome #if defined(_WIN32) 3055ffb0c9bSToomas Soome #define __func__ __FUNCTION__ 3065ffb0c9bSToomas Soome #endif 3075ffb0c9bSToomas Soome 3085ffb0c9bSToomas Soome #define mDNS_Lock(X) mDNS_Lock_((X), __func__) 3095ffb0c9bSToomas Soome 3105ffb0c9bSToomas Soome #define mDNS_Unlock(X) mDNS_Unlock_((X), __func__) 3115ffb0c9bSToomas Soome 312cda73f64SToomas Soome #define mDNS_CheckLock(X) \ 313cda73f64SToomas Soome if ((X)->mDNS_busy != (X)->mDNS_reentrancy+1) LogMsg("%s: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", __func__, (X)->mDNS_busy, (X)->mDNS_reentrancy) 3145ffb0c9bSToomas Soome 3155ffb0c9bSToomas Soome #define mDNS_DropLockBeforeCallback() do { m->mDNS_reentrancy++; \ 316cda73f64SToomas Soome if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Locking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ 317cda73f64SToomas Soome } while (0) 3185ffb0c9bSToomas Soome 3195ffb0c9bSToomas Soome #define mDNS_ReclaimLockAfterCallback() do { \ 320cda73f64SToomas Soome if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Unlocking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ 321cda73f64SToomas Soome m->mDNS_reentrancy--; } while (0) 3224b22b933Srs 3235ffb0c9bSToomas Soome #ifdef __cplusplus 3245ffb0c9bSToomas Soome } 3254b22b933Srs #endif 3264b22b933Srs 3274b22b933Srs #endif // __DNSCOMMON_H_ 328