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133 lines
6.7 KiB
133 lines
6.7 KiB
4 months ago
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/* -*- Mode: C; tab-width: 4 -*-
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*
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* Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UDNS_H_
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#define __UDNS_H_
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#include "mDNSEmbeddedAPI.h"
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#include "DNSCommon.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RESTART_GOODBYE_DELAY (6 * mDNSPlatformOneSecond) // delay after restarting LLQ before nuking previous known answers (avoids flutter if we restart before we have networking up)
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#define INIT_UCAST_POLL_INTERVAL (3 * mDNSPlatformOneSecond) // this interval is used after send failures on network transitions
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// which typically heal quickly, so we start agressively and exponentially back off
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#define MAX_UCAST_POLL_INTERVAL (60 * 60 * mDNSPlatformOneSecond)
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//#define MAX_UCAST_POLL_INTERVAL (1 * 60 * mDNSPlatformOneSecond)
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#define LLQ_POLL_INTERVAL (15 * 60 * mDNSPlatformOneSecond) // Polling interval for zones w/ an advertised LLQ port (ie not static zones) if LLQ fails due to NAT, etc.
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#define RESPONSE_WINDOW (60 * mDNSPlatformOneSecond) // require server responses within one minute of request
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#define MAX_UCAST_UNANSWERED_QUERIES 2 // the number of unanswered queries from any one uDNS server before trying another server
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#define DNSSERVER_PENALTY_TIME (60 * mDNSPlatformOneSecond) // number of seconds for which new questions don't pick this server
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#define DEFAULT_UPDATE_LEASE 7200
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#define QuestionIntervalStep 3
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#define QuestionIntervalStep2 (QuestionIntervalStep*QuestionIntervalStep)
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#define QuestionIntervalStep3 (QuestionIntervalStep*QuestionIntervalStep*QuestionIntervalStep)
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#define InitialQuestionInterval ((mDNSPlatformOneSecond + QuestionIntervalStep-1) / QuestionIntervalStep)
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// For Unicast record registrations, we initialize the interval to 1 second. When we send any query for
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// the record registration e.g., GetZoneData, we always back off by QuestionIntervalStep
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// so that the first retry does not happen until 3 seconds which should be enough for TCP/TLS to be done.
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#define INIT_RECORD_REG_INTERVAL (1 * mDNSPlatformOneSecond)
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#define MAX_RECORD_REG_INTERVAL (15 * 60 * mDNSPlatformOneSecond)
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#define MERGE_DELAY_TIME (1 * mDNSPlatformOneSecond)
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// If we are refreshing, we do it at least 5 times with a min update frequency of
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// 5 minutes
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#define MAX_UPDATE_REFRESH_COUNT 5
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#define MIN_UPDATE_REFRESH_TIME (5 * 60 * mDNSPlatformOneSecond)
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// For questions that use kDNSServiceFlagsTimeout and we don't have a matching resolver e.g., no dns servers,
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// then use the default value of 30 seconds
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#define DEFAULT_UDNS_TIMEOUT 30 // in seconds
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// Entry points into unicast-specific routines
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extern void LLQGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo);
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extern void startLLQHandshake(mDNS *m, DNSQuestion *q);
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extern void sendLLQRefresh(mDNS *m, DNSQuestion *q);
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extern void SleepRecordRegistrations(mDNS *m);
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// uDNS_UpdateRecord
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// following fields must be set, and the update validated, upon entry.
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// rr->NewRData
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// rr->newrdlength
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// rr->UpdateCallback
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extern mStatus uDNS_UpdateRecord(mDNS *m, AuthRecord *rr);
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extern void SetNextQueryTime(mDNS *const m, const DNSQuestion *const q);
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extern CacheGroup *CacheGroupForName(const mDNS *const m, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name);
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extern mStatus mDNS_Register_internal(mDNS *const m, AuthRecord *const rr);
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extern mStatus mDNS_Deregister_internal(mDNS *const m, AuthRecord *const rr, mDNS_Dereg_type drt);
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extern mStatus mDNS_StartQuery_internal(mDNS *const m, DNSQuestion *const question);
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extern mStatus mDNS_StopQuery_internal(mDNS *const m, DNSQuestion *const question);
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extern mStatus mDNS_StartNATOperation_internal(mDNS *const m, NATTraversalInfo *traversal);
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extern void RecordRegistrationGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneData);
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extern mStatus uDNS_DeregisterRecord(mDNS *const m, AuthRecord *const rr);
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extern const domainname *GetServiceTarget(mDNS *m, AuthRecord *const rr);
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extern void uDNS_CheckCurrentQuestion(mDNS *const m);
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// integer fields of msg header must be in HOST byte order before calling this routine
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extern void uDNS_ReceiveMsg(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end,
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const mDNSAddr *const srcaddr, const mDNSIPPort srcport);
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extern void uDNS_Tasks(mDNS *const m);
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extern void UpdateAllSRVRecords(mDNS *m);
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extern void CheckNATMappings(mDNS *m);
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extern mStatus uDNS_SetupDNSConfig(mDNS *const m);
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// uDNS_SetupSearchDomains by default adds search domains. It also can be called with one or
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// more values for "action" which does the following:
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//
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// -UDNS_START_WAB_QUERY - start Wide Area Bonjour (domain enumeration) queries
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#define UDNS_START_WAB_QUERY 0x00000001
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extern mStatus uDNS_SetupSearchDomains(mDNS *const m, int action);
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extern domainname *uDNS_GetNextSearchDomain(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSs8 *searchIndex, mDNSBool ignoreDotLocal);
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typedef enum
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{
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uDNS_LLQ_Not = 0, // Normal uDNS answer: Flush any stale records from cache, and respect record TTL
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uDNS_LLQ_Ignore, // LLQ initial challenge packet: ignore -- has no useful records for us
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uDNS_LLQ_Entire, // LLQ initial set of answers: Flush any stale records from cache, but assume TTL is 2 x LLQ refresh interval
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uDNS_LLQ_Events // LLQ event packet: don't flush cache; assume TTL is 2 x LLQ refresh interval
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} uDNS_LLQType;
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extern uDNS_LLQType uDNS_recvLLQResponse(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport, DNSQuestion **matchQuestion);
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extern DomainAuthInfo *GetAuthInfoForName_internal(mDNS *m, const domainname *const name);
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extern DomainAuthInfo *GetAuthInfoForQuestion(mDNS *m, const DNSQuestion *const q);
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extern void DisposeTCPConn(struct tcpInfo_t *tcp);
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// NAT traversal
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extern void uDNS_ReceiveNATPMPPacket(mDNS *m, const mDNSInterfaceID InterfaceID, mDNSu8 *pkt, mDNSu16 len); // Called for each received NAT-PMP packet
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extern void natTraversalHandleAddressReply(mDNS *const m, mDNSu16 err, mDNSv4Addr ExtAddr);
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extern void natTraversalHandlePortMapReply(mDNS *const m, NATTraversalInfo *n, const mDNSInterfaceID InterfaceID, mDNSu16 err, mDNSIPPort extport, mDNSu32 lease);
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#ifdef __cplusplus
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}
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#endif
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#endif // __UDNS_H_
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