147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt/* -*- Mode: C; tab-width: 4 -*- 247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. 447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Licensed under the Apache License, Version 2.0 (the "License"); 647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * you may not use this file except in compliance with the License. 747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * You may obtain a copy of the License at 847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * http://www.apache.org/licenses/LICENSE-2.0 1047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * 1147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * Unless required by applicable law or agreed to in writing, software 1247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * distributed under the License is distributed on an "AS IS" BASIS, 1347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * See the License for the specific language governing permissions and 1547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt * limitations under the License. 1647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt */ 1747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 1847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#ifndef __DNSCOMMON_H_ 1947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define __DNSCOMMON_H_ 2047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 2147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#include "mDNSEmbeddedAPI.h" 2247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 2347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#ifdef __cplusplus 2447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt extern "C" { 2547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 2647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 2747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt//************************************************************************************************************* 2847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// Macros 2947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 3047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// Note: The C preprocessor stringify operator ('#') makes a string from its argument, without macro expansion 3147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// e.g. If "version" is #define'd to be "4", then STRINGIFY_AWE(version) will return the string "version", not "4" 3247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// To expand "version" to its value before making the string, use STRINGIFY(version) instead 3347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) #s 3447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define STRINGIFY(s) STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) 3547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 3647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 3747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 3847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - DNS Protocol Constants 3947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 4047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 4147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalttypedef enum 4247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 4347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_QR_Mask = 0x80, // Query or response? 4447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_QR_Query = 0x00, 4547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_QR_Response = 0x80, 4647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 4747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Mask = 0x78, // Operation type 4847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_StdQuery = 0x00, 4947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Iquery = 0x08, 5047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Status = 0x10, 5147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Unused3 = 0x18, 5247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Notify = 0x20, 5347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_OP_Update = 0x28, 5447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 5547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_QROP_Mask = kDNSFlag0_QR_Mask | kDNSFlag0_OP_Mask, 5647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 5747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_AA = 0x04, // Authoritative Answer? 5847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_TC = 0x02, // Truncated? 5947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag0_RD = 0x01, // Recursion Desired? 6047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RA = 0x80, // Recursion Available? 6147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 6247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_Zero = 0x40, // Reserved; must be zero 6347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_AD = 0x20, // Authentic Data [RFC 2535] 6447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_CD = 0x10, // Checking Disabled [RFC 2535] 6547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 6647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_Mask = 0x0F, // Response code 6747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NoErr = 0x00, 6847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_FormErr = 0x01, 6947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_ServFail = 0x02, 7047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NXDomain = 0x03, 7147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NotImpl = 0x04, 7247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_Refused = 0x05, 7347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_YXDomain = 0x06, 7447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_YXRRSet = 0x07, 7547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NXRRSet = 0x08, 7647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NotAuth = 0x09, 7747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt kDNSFlag1_RC_NotZone = 0x0A 7847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } DNS_Flags; 7947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 8047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalttypedef enum 8147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt { 8247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt TSIG_ErrBadSig = 16, 8347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt TSIG_ErrBadKey = 17, 8447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt TSIG_ErrBadTime = 18 8547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } TSIG_ErrorCode; 8647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 8747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 8847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 8947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 9047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - General Utility Functions 9147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 9247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 9347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf); 9447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf); 9547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 9647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 mDNSRandom(mDNSu32 max); // Returns pseudo-random result from zero to max inclusive 9747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 9847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 9947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 10047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 10147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - Domain Name Utility Functions 10247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 10347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 10447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNSIsDigit(X) ((X) >= '0' && (X) <= '9') 10547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNSIsUpperCase(X) ((X) >= 'A' && (X) <= 'Z') 10647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNSIsLowerCase(X) ((X) >= 'a' && (X) <= 'z') 10747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNSIsLetter(X) (mDNSIsUpperCase(X) || mDNSIsLowerCase(X)) 10847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 10947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNSValidHostChar(X, notfirst, notlast) (mDNSIsLetter(X) || mDNSIsDigit(X) || ((notfirst) && (notlast) && (X) == '-') ) 11047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 11147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent); 11247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern int CountLabels(const domainname *d); 11347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const domainname *SkipLeadingLabels(const domainname *d, int skip); 11447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 11547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max); 11647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText); 11747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText); 11847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText); 11947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define ValidateDomainName(N) (DomainNameLength(N) <= MAX_DOMAIN_NAME) 12047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 12147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 12247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 12347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 12447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - Resource Record Utility Functions 12547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 12647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 12747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// IdenticalResourceRecord returns true if two resources records have 12847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// the same name, type, class, and identical rdata (InterfaceID and TTL may differ) 12947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 13047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// IdenticalSameNameRecord is the same, except it skips the expensive SameDomainName() check, 13147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// which is at its most expensive and least useful in cases where we know in advance that the names match 13247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 13347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// Note: The dominant use of IdenticalResourceRecord is from ProcessQuery(), handling known-answer lists. In this case 13447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// it's common to have a whole bunch or records with exactly the same name (e.g. "_http._tcp.local") but different RDATA. 13547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// The SameDomainName() check is expensive when the names match, and in this case *all* the names match, so we 13647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// used to waste a lot of CPU time verifying that the names match, only then to find that the RDATA is different. 13747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// We observed mDNSResponder spending 30% of its total CPU time on this single task alone. 13847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// By swapping the checks so that we check the RDATA first, we can quickly detect when it's different 13947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// (99% of the time) and then bail out before we waste time on the expensive SameDomainName() check. 14047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 14147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define IdenticalResourceRecord(r1,r2) ( \ 14247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rrtype == (r2)->rrtype && \ 14347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rrclass == (r2)->rrclass && \ 14447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->namehash == (r2)->namehash && \ 14547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rdlength == (r2)->rdlength && \ 14647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rdatahash == (r2)->rdatahash && \ 14747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt SameRDataBody((r1), &(r2)->rdata->u, SameDomainName) && \ 14847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt SameDomainName((r1)->name, (r2)->name)) 14947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 15047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define IdenticalSameNameRecord(r1,r2) ( \ 15147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rrtype == (r2)->rrtype && \ 15247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rrclass == (r2)->rrclass && \ 15347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rdlength == (r2)->rdlength && \ 15447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt (r1)->rdatahash == (r2)->rdatahash && \ 15547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt SameRDataBody((r1), &(r2)->rdata->u, SameDomainName)) 15647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 15747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// A given RRType answers a QuestionType if RRType is CNAME, or types match, or QuestionType is ANY, 15847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// or the RRType is NSEC and positively asserts the nonexistence of the type being requested 15947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define RRTypeAnswersQuestionType(R,Q) ((R)->rrtype == kDNSType_CNAME || (R)->rrtype == (Q) || (Q) == kDNSQType_ANY || RRAssertsNonexistence((R),(Q))) 16047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define RRAssertsNonexistence(R,T) ((R)->rrtype == kDNSType_NSEC && (T) < kDNSQType_ANY && !((R)->rdata->u.nsec.bitmap[(T)>>3] & (128 >> ((T)&7)))) 16147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 16247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 RDataHashValue(const ResourceRecord *const rr); 16347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename); 16447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool SameNameRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q); 16547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q); 16647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool AnyTypeRecordAnswersQuestion (const ResourceRecord *const rr, const DNSQuestion *const q); 16747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q); 16847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const rr, const DNSQuestion *const q); 16947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate); 17047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd); 17147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 17247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define GetRRDomainNameTarget(RR) ( \ 17347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt ((RR)->rrtype == kDNSType_NS || (RR)->rrtype == kDNSType_CNAME || (RR)->rrtype == kDNSType_PTR || (RR)->rrtype == kDNSType_DNAME) ? &(RR)->rdata->u.name : \ 17447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt ((RR)->rrtype == kDNSType_MX || (RR)->rrtype == kDNSType_AFSDB || (RR)->rrtype == kDNSType_RT || (RR)->rrtype == kDNSType_KX ) ? &(RR)->rdata->u.mx.exchange : \ 17547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt ((RR)->rrtype == kDNSType_SRV ) ? &(RR)->rdata->u.srv.target : mDNSNULL ) 17647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 17747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define LocalRecordReady(X) ((X)->resrec.RecordType != kDNSRecordTypeUnique) 17847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 17947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 18047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 18147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 18247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - DNS Message Creation Functions 18347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 18447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 18547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags); 18647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname); 18747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name); 18847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr); 18947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 19047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// If we have a single large record to put in the packet, then we allow the packet to be up to 9K bytes, 19147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// but in the normal case we try to keep the packets below 1500 to avoid IP fragmentation on standard Ethernet 19247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 19347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define AllowedRRSpace(msg) (((msg)->h.numAnswers || (msg)->h.numAuthorities || (msg)->h.numAdditionals) ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData) 19447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 19547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, ResourceRecord *rr, mDNSu32 ttl, const mDNSu8 *limit); 19647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 19747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define PutResourceRecordTTL(msg, ptr, count, rr, ttl) \ 19847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AllowedRRSpace(msg)) 19947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 20047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define PutResourceRecordTTLJumbo(msg, ptr, count, rr, ttl) \ 20147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AbsoluteMaxDNSMessageData) 20247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 20347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define PutResourceRecord(MSG, P, C, RR) PutResourceRecordTTL((MSG), (P), (C), (RR), (RR)->rroriginalttl) 20447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 20547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// The PutRR_OS variants assume a local variable 'm', put build the packet at m->omsg, 20647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// and assume a local variable 'OwnerRecordSpace' indicating how many bytes (if any) to reserve to add an OWNER option at the end 20747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define PutRR_OS_TTL(ptr, count, rr, ttl) \ 20847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt PutResourceRecordTTLWithLimit(&m->omsg, (ptr), (count), (rr), (ttl), m->omsg.data + AllowedRRSpace(&m->omsg) - OwnerRecordSpace) 20947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 21047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define PutRR_OS(P, C, RR) PutRR_OS_TTL((P), (C), (RR), (RR)->rroriginalttl) 21147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 21247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass); 21347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass); 21447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end); 21547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr); 21647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit); 21747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit); 21847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name); 21947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease); 22047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *ptr, mDNSu32 lease, mDNSu8 *limit); 22147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 22247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu8 *putHINFO(const mDNS *const m, DNSMessage *const msg, mDNSu8 *ptr, DomainAuthInfo *authInfo, mDNSu8 *limit); 22347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 22447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 22547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 22647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 22747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - DNS Message Parsing Functions 22847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 22947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 23047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define AuthHashSlot(X) (DomainNameHashValue(X) % AUTH_HASH_SLOTS) 23147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define HashSlot(X) (DomainNameHashValue(X) % CACHE_HASH_SLOTS) 23247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 DomainNameHashValue(const domainname *const name); 23347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength); 23447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end); 23547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, 23647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt domainname *const name); 23747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); 23847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage * const msg, const mDNSu8 *ptr, 23947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt const mDNSu8 * end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr); 24047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end); 24147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID, 24247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt DNSQuestion *question); 24347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end); 24447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end); 24547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end); 24647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize); 24747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end); 24847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mDNSu32 GetPktLease(mDNS *m, DNSMessage *msg, const mDNSu8 *end); 24947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void DumpPacket(mDNS *const m, mStatus status, mDNSBool sent, char *transport, 25047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt const mDNSAddr *srcaddr, mDNSIPPort srcport, 25147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end); 25247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 25347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 25447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 25547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 25647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - Packet Sending Functions 25747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 25847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 25947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end, 26047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport, TCPSocket *sock, DomainAuthInfo *authInfo); 26147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 26247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt// *************************************************************************** 26347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if COMPILER_LIKES_PRAGMA_MARK 26447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - 26547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#pragma mark - RR List Management & Task Management 26647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 26747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 26847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void ShowTaskSchedulingError(mDNS *const m); 26947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void mDNS_Lock_(mDNS *const m, const char * const functionname); 27047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwaltextern void mDNS_Unlock_(mDNS *const m, const char * const functionname); 27147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 27247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#if defined(_WIN32) 27347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt #define __func__ __FUNCTION__ 27447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 27547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 27647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNS_Lock(X) mDNS_Lock_((X), __func__) 27747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 27847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNS_Unlock(X) mDNS_Unlock_((X), __func__) 27947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 28047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNS_DropLockBeforeCallback() do { m->mDNS_reentrancy++; \ 28147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Locking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ 28247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } while (0) 28347e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 28447e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#define mDNS_ReclaimLockAfterCallback() do { \ 28547e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Unlocking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \ 28647e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt m->mDNS_reentrancy--; } while (0) 28747e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 28847e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#ifdef __cplusplus 28947e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt } 29047e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif 29147e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt 29247e4cebad7397422144bb03a21f3f7682c062c4aRobert Greenwalt#endif // __DNSCOMMON_H_ 293