/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* This file defines a simple shim layer between a client calling the "/usr/include/dns_sd.h" APIs
* and an implementation of mDNSCore ("mDNSEmbeddedAPI.h" APIs) in the same address space.
* When the client calls a dns_sd.h function, the shim calls the corresponding mDNSEmbeddedAPI.h
* function, and when mDNSCore calls the shim's callback, we call through to the client's callback.
* The shim is responsible for two main things:
* - converting string parameters between C string format and native DNS format,
* - and for allocating and freeing memory.
*/
#include "dns_sd.h" // Defines the interface to the client layer above
#include "mDNSEmbeddedAPI.h" // The interface we're building on top of
extern mDNS mDNSStorage; // We need to pass the address of this storage to the lower-layer functions
#if MDNS_BUILDINGSHAREDLIBRARY || MDNS_BUILDINGSTUBLIBRARY
#pragma export on
#endif
//*************************************************************************************************************
// General Utility Functions
// All mDNS_DirectOP structures start with the pointer to the type-specific disposal function.
// Optional type-specific data follows these three fields
// When the client starts an operation, we return the address of the corresponding mDNS_DirectOP
// as the DNSServiceRef for the operation
// We stash the value in core context fields so we can get it back to recover our state in our callbacks,
// and pass it though to the client for it to recover its state
typedef struct mDNS_DirectOP_struct mDNS_DirectOP;
typedef void mDNS_DirectOP_Dispose(mDNS_DirectOP *op);
struct mDNS_DirectOP_struct
{
mDNS_DirectOP_Dispose *disposefn;
};
typedef struct
{
mDNS_DirectOP_Dispose *disposefn;
DNSServiceRegisterReply callback;
void *context;
mDNSBool autoname; // Set if this name is tied to the Computer Name
mDNSBool autorename; // Set if we just got a name conflict and now need to automatically pick a new name
domainlabel name;
domainname host;
ServiceRecordSet s;
} mDNS_DirectOP_Register;
typedef struct
{
mDNS_DirectOP_Dispose *disposefn;
DNSServiceBrowseReply callback;
void *context;
DNSQuestion q;
} mDNS_DirectOP_Browse;
typedef struct
{
mDNS_DirectOP_Dispose *disposefn;
DNSServiceResolveReply callback;
void *context;
const ResourceRecord *SRV;
const ResourceRecord *TXT;
DNSQuestion qSRV;
DNSQuestion qTXT;
} mDNS_DirectOP_Resolve;
typedef struct
{
mDNS_DirectOP_Dispose *disposefn;
DNSServiceQueryRecordReply callback;
void *context;
DNSQuestion q;
} mDNS_DirectOP_QueryRecord;
int DNSServiceRefSockFD(DNSServiceRef sdRef)
{
(void)sdRef; // Unused
return(0);
}
DNSServiceErrorType DNSServiceProcessResult(DNSServiceRef sdRef)
{
(void)sdRef; // Unused
return(kDNSServiceErr_NoError);
}
void DNSServiceRefDeallocate(DNSServiceRef sdRef)
{
mDNS_DirectOP *op = (mDNS_DirectOP *)sdRef;
//LogMsg("DNSServiceRefDeallocate");
op->disposefn(op);
}
//*************************************************************************************************************
// Domain Enumeration
// Not yet implemented, so don't include in stub library
// We DO include it in the actual Extension, so that if a later client compiled to use this
// is run against this Extension, it will get a reasonable error code instead of just
// failing to launch (Strong Link) or calling an unresolved symbol and crashing (Weak Link)
#if !MDNS_BUILDINGSTUBLIBRARY
DNSServiceErrorType DNSServiceEnumerateDomains
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
DNSServiceDomainEnumReply callback,
void *context /* may be NULL */
)
{
(void)sdRef; // Unused
(void)flags; // Unused
(void)interfaceIndex; // Unused
(void)callback; // Unused
(void)context; // Unused
return(kDNSServiceErr_Unsupported);
}
#endif
//*************************************************************************************************************
// Register Service
mDNSlocal void FreeDNSServiceRegistration(mDNS_DirectOP_Register *x)
{
while (x->s.Extras)
{
ExtraResourceRecord *extras = x->s.Extras;
x->s.Extras = x->s.Extras->next;
if (extras->r.resrec.rdata != &extras->r.rdatastorage)
mDNSPlatformMemFree(extras->r.resrec.rdata);
mDNSPlatformMemFree(extras);
}
if (x->s.RR_TXT.resrec.rdata != &x->s.RR_TXT.rdatastorage)
mDNSPlatformMemFree(x->s.RR_TXT.resrec.rdata);
if (x->s.SubTypes) mDNSPlatformMemFree(x->s.SubTypes);
mDNSPlatformMemFree(x);
}
static void DNSServiceRegisterDispose(mDNS_DirectOP *op)
{
mDNS_DirectOP_Register *x = (mDNS_DirectOP_Register*)op;
x->autorename = mDNSfalse;
// If mDNS_DeregisterService() returns mStatus_NoError, that means that the service was found in the list,
// is sending its goodbye packet, and we'll get an mStatus_MemFree message when we can free the memory.
// If mDNS_DeregisterService() returns an error, it means that the service had already been removed from
// the list, so we should go ahead and free the memory right now
if (mDNS_DeregisterService(&mDNSStorage, &x->s) != mStatus_NoError)
FreeDNSServiceRegistration(x);
}
mDNSlocal void RegCallback(mDNS *const m, ServiceRecordSet *const sr, mStatus result)
{
mDNS_DirectOP_Register *x = (mDNS_DirectOP_Register*)sr->ServiceContext;
domainlabel name;
domainname type, dom;
char namestr[MAX_DOMAIN_LABEL+1]; // Unescaped name: up to 63 bytes plus C-string terminating NULL.
char typestr[MAX_ESCAPED_DOMAIN_NAME];
char domstr [MAX_ESCAPED_DOMAIN_NAME];
if (!DeconstructServiceName(sr->RR_SRV.resrec.name, &name, &type, &dom)) return;
if (!ConvertDomainLabelToCString_unescaped(&name, namestr)) return;
if (!ConvertDomainNameToCString(&type, typestr)) return;
if (!ConvertDomainNameToCString(&dom, domstr)) return;
if (result == mStatus_NoError)
{
if (x->callback)
x->callback((DNSServiceRef)x, 0, result, namestr, typestr, domstr, x->context);
}
else if (result == mStatus_NameConflict)
{
if (x->autoname) mDNS_RenameAndReregisterService(m, sr, mDNSNULL);
else if (x->callback)
x->callback((DNSServiceRef)x, 0, result, namestr, typestr, domstr, x->context);
}
else if (result == mStatus_MemFree)
{
if (x->autorename)
{
x->autorename = mDNSfalse;
x->name = mDNSStorage.nicelabel;
mDNS_RenameAndReregisterService(m, &x->s, &x->name);
}
else
FreeDNSServiceRegistration(x);
}
}
DNSServiceErrorType DNSServiceRegister
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *name, /* may be NULL */
const char *regtype,
const char *domain, /* may be NULL */
const char *host, /* may be NULL */
uint16_t notAnIntPort,
uint16_t txtLen,
const void *txtRecord, /* may be NULL */
DNSServiceRegisterReply callback, /* may be NULL */
void *context /* may be NULL */
)
{
mStatus err = mStatus_NoError;
const char *errormsg = "Unknown";
domainlabel n;
domainname t, d, h, srv;
mDNSIPPort port;
unsigned int size = sizeof(RDataBody);
AuthRecord *SubTypes = mDNSNULL;
mDNSu32 NumSubTypes = 0;
mDNS_DirectOP_Register *x;
(void)flags; // Unused
(void)interfaceIndex; // Unused
// Check parameters
if (!name) name = "";
if (!name[0]) n = mDNSStorage.nicelabel;
else if (!MakeDomainLabelFromLiteralString(&n, name)) { errormsg = "Bad Instance Name"; goto badparam; }
if (!regtype || !*regtype || !MakeDomainNameFromDNSNameString(&t, regtype)) { errormsg = "Bad Service Type"; goto badparam; }
if (!MakeDomainNameFromDNSNameString(&d, (domain && *domain) ? domain : "local.")) { errormsg = "Bad Domain"; goto badparam; }
if (!MakeDomainNameFromDNSNameString(&h, (host && *host ) ? host : "")) { errormsg = "Bad Target Host"; goto badparam; }
if (!ConstructServiceName(&srv, &n, &t, &d)) { errormsg = "Bad Name"; goto badparam; }
port.NotAnInteger = notAnIntPort;
// Allocate memory, and handle failure
if (size < txtLen)
size = txtLen;
x = (mDNS_DirectOP_Register *)mDNSPlatformMemAllocate(sizeof(*x) - sizeof(RDataBody) + size);
if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; }
// Set up object
x->disposefn = DNSServiceRegisterDispose;
x->callback = callback;
x->context = context;
x->autoname = (!name[0]);
x->autorename = mDNSfalse;
x->name = n;
x->host = h;
// Do the operation
err = mDNS_RegisterService(&mDNSStorage, &x->s,
&x->name, &t, &d, // Name, type, domain
&x->host, port, // Host and port
txtRecord, txtLen, // TXT data, length
SubTypes, NumSubTypes, // Subtypes
mDNSInterface_Any, // Interface ID
RegCallback, x, 0); // Callback, context, flags
if (err) { mDNSPlatformMemFree(x); errormsg = "mDNS_RegisterService"; goto fail; }
// Succeeded: Wrap up and return
*sdRef = (DNSServiceRef)x;
return(mStatus_NoError);
badparam:
err = mStatus_BadParamErr;
fail:
LogMsg("DNSServiceBrowse(\"%s\", \"%s\") failed: %s (%ld)", regtype, domain, errormsg, err);
return(err);
}
//*************************************************************************************************************
// Add / Update / Remove records from existing Registration
// Not yet implemented, so don't include in stub library
// We DO include it in the actual Extension, so that if a later client compiled to use this
// is run against this Extension, it will get a reasonable error code instead of just
// failing to launch (Strong Link) or calling an unresolved symbol and crashing (Weak Link)
#if !MDNS_BUILDINGSTUBLIBRARY
DNSServiceErrorType DNSServiceAddRecord
(
DNSServiceRef sdRef,
DNSRecordRef *RecordRef,
DNSServiceFlags flags,
uint16_t rrtype,
uint16_t rdlen,
const void *rdata,
uint32_t ttl
)
{
(void)sdRef; // Unused
(void)RecordRef; // Unused
(void)flags; // Unused
(void)rrtype; // Unused
(void)rdlen; // Unused
(void)rdata; // Unused
(void)ttl; // Unused
return(kDNSServiceErr_Unsupported);
}
DNSServiceErrorType DNSServiceUpdateRecord
(
DNSServiceRef sdRef,
DNSRecordRef RecordRef, /* may be NULL */
DNSServiceFlags flags,
uint16_t rdlen,
const void *rdata,
uint32_t ttl
)
{
(void)sdRef; // Unused
(void)RecordRef; // Unused
(void)flags; // Unused
(void)rdlen; // Unused
(void)rdata; // Unused
(void)ttl; // Unused
return(kDNSServiceErr_Unsupported);
}
DNSServiceErrorType DNSServiceRemoveRecord
(
DNSServiceRef sdRef,
DNSRecordRef RecordRef,
DNSServiceFlags flags
)
{
(void)sdRef; // Unused
(void)RecordRef; // Unused
(void)flags; // Unused
return(kDNSServiceErr_Unsupported);
}
#endif
//*************************************************************************************************************
// Browse for services
static void DNSServiceBrowseDispose(mDNS_DirectOP *op)
{
mDNS_DirectOP_Browse *x = (mDNS_DirectOP_Browse*)op;
//LogMsg("DNSServiceBrowseDispose");
mDNS_StopBrowse(&mDNSStorage, &x->q);
mDNSPlatformMemFree(x);
}
mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
DNSServiceFlags flags = AddRecord ? kDNSServiceFlagsAdd : (DNSServiceFlags)0;
domainlabel name;
domainname type, domain;
char cname[MAX_DOMAIN_LABEL+1]; // Unescaped name: up to 63 bytes plus C-string terminating NULL.
char ctype[MAX_ESCAPED_DOMAIN_NAME];
char cdom [MAX_ESCAPED_DOMAIN_NAME];
mDNS_DirectOP_Browse *x = (mDNS_DirectOP_Browse*)question->QuestionContext;
(void)m; // Unused
if (answer->rrtype != kDNSType_PTR)
{ LogMsg("FoundInstance: Should not be called with rrtype %d (not a PTR record)", answer->rrtype); return; }
if (!DeconstructServiceName(&answer->rdata->u.name, &name, &type, &domain))
{
LogMsg("FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer",
answer->name->c, answer->rdata->u.name.c);
return;
}
ConvertDomainLabelToCString_unescaped(&name, cname);
ConvertDomainNameToCString(&type, ctype);
ConvertDomainNameToCString(&domain, cdom);
if (x->callback)
x->callback((DNSServiceRef)x, flags, 0, 0, cname, ctype, cdom, x->context);
}
DNSServiceErrorType DNSServiceBrowse
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *regtype,
const char *domain, /* may be NULL */
DNSServiceBrowseReply callback,
void *context /* may be NULL */
)
{
mStatus err = mStatus_NoError;
const char *errormsg = "Unknown";
domainname t, d;
mDNS_DirectOP_Browse *x;
(void)flags; // Unused
(void)interfaceIndex; // Unused
// Check parameters
if (!regtype[0] || !MakeDomainNameFromDNSNameString(&t, regtype)) { errormsg = "Illegal regtype"; goto badparam; }
if (!MakeDomainNameFromDNSNameString(&d, *domain ? domain : "local.")) { errormsg = "Illegal domain"; goto badparam; }
// Allocate memory, and handle failure
x = (mDNS_DirectOP_Browse *)mDNSPlatformMemAllocate(sizeof(*x));
if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; }
// Set up object
x->disposefn = DNSServiceBrowseDispose;
x->callback = callback;
x->context = context;
x->q.QuestionContext = x;
// Do the operation
err = mDNS_StartBrowse(&mDNSStorage, &x->q, &t, &d, mDNSInterface_Any, (flags & kDNSServiceFlagsForceMulticast) != 0, FoundInstance, x);
if (err) { mDNSPlatformMemFree(x); errormsg = "mDNS_StartBrowse"; goto fail; }
// Succeeded: Wrap up and return
*sdRef = (DNSServiceRef)x;
return(mStatus_NoError);
badparam:
err = mStatus_BadParamErr;
fail:
LogMsg("DNSServiceBrowse(\"%s\", \"%s\") failed: %s (%ld)", regtype, domain, errormsg, err);
return(err);
}
//*************************************************************************************************************
// Resolve Service Info
static void DNSServiceResolveDispose(mDNS_DirectOP *op)
{
mDNS_DirectOP_Resolve *x = (mDNS_DirectOP_Resolve*)op;
if (x->qSRV.ThisQInterval >= 0) mDNS_StopQuery(&mDNSStorage, &x->qSRV);
if (x->qTXT.ThisQInterval >= 0) mDNS_StopQuery(&mDNSStorage, &x->qTXT);
mDNSPlatformMemFree(x);
}
mDNSlocal void FoundServiceInfo(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
mDNS_DirectOP_Resolve *x = (mDNS_DirectOP_Resolve*)question->QuestionContext;
(void)m; // Unused
if (!AddRecord)
{
if (answer->rrtype == kDNSType_SRV && x->SRV == answer) x->SRV = mDNSNULL;
if (answer->rrtype == kDNSType_TXT && x->TXT == answer) x->TXT = mDNSNULL;
}
else
{
if (answer->rrtype == kDNSType_SRV) x->SRV = answer;
if (answer->rrtype == kDNSType_TXT) x->TXT = answer;
if (x->SRV && x->TXT && x->callback)
{
char fullname[MAX_ESCAPED_DOMAIN_NAME], targethost[MAX_ESCAPED_DOMAIN_NAME];
ConvertDomainNameToCString(answer->name, fullname);
ConvertDomainNameToCString(&x->SRV->rdata->u.srv.target, targethost);
x->callback((DNSServiceRef)x, 0, 0, kDNSServiceErr_NoError, fullname, targethost,
x->SRV->rdata->u.srv.port.NotAnInteger, x->TXT->rdlength, (unsigned char*)x->TXT->rdata->u.txt.c, x->context);
}
}
}
DNSServiceErrorType DNSServiceResolve
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *name,
const char *regtype,
const char *domain,
DNSServiceResolveReply callback,
void *context /* may be NULL */
)
{
mStatus err = mStatus_NoError;
const char *errormsg = "Unknown";
domainlabel n;
domainname t, d, srv;
mDNS_DirectOP_Resolve *x;
(void)flags; // Unused
(void)interfaceIndex; // Unused
// Check parameters
if (!name[0] || !MakeDomainLabelFromLiteralString(&n, name )) { errormsg = "Bad Instance Name"; goto badparam; }
if (!regtype[0] || !MakeDomainNameFromDNSNameString(&t, regtype)) { errormsg = "Bad Service Type"; goto badparam; }
if (!domain[0] || !MakeDomainNameFromDNSNameString(&d, domain )) { errormsg = "Bad Domain"; goto badparam; }
if (!ConstructServiceName(&srv, &n, &t, &d)) { errormsg = "Bad Name"; goto badparam; }
// Allocate memory, and handle failure
x = (mDNS_DirectOP_Resolve *)mDNSPlatformMemAllocate(sizeof(*x));
if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; }
// Set up object
x->disposefn = DNSServiceResolveDispose;
x->callback = callback;
x->context = context;
x->SRV = mDNSNULL;
x->TXT = mDNSNULL;
x->qSRV.ThisQInterval = -1; // So that DNSServiceResolveDispose() knows whether to cancel this question
x->qSRV.InterfaceID = mDNSInterface_Any;
x->qSRV.Target = zeroAddr;
AssignDomainName(&x->qSRV.qname, &srv);
x->qSRV.qtype = kDNSType_SRV;
x->qSRV.qclass = kDNSClass_IN;
x->qSRV.LongLived = mDNSfalse;
x->qSRV.ExpectUnique = mDNStrue;
x->qSRV.ForceMCast = mDNSfalse;
x->qSRV.ReturnIntermed = mDNSfalse;
x->qSRV.SuppressUnusable = mDNSfalse;
x->qSRV.SearchListIndex = 0;
x->qSRV.AppendSearchDomains = 0;
x->qSRV.RetryWithSearchDomains = mDNSfalse;
x->qSRV.TimeoutQuestion = 0;
x->qSRV.WakeOnResolve = 0;
x->qSRV.qnameOrig = mDNSNULL;
x->qSRV.QuestionCallback = FoundServiceInfo;
x->qSRV.QuestionContext = x;
x->qTXT.ThisQInterval = -1; // So that DNSServiceResolveDispose() knows whether to cancel this question
x->qTXT.InterfaceID = mDNSInterface_Any;
x->qTXT.Target = zeroAddr;
AssignDomainName(&x->qTXT.qname, &srv);
x->qTXT.qtype = kDNSType_TXT;
x->qTXT.qclass = kDNSClass_IN;
x->qTXT.LongLived = mDNSfalse;
x->qTXT.ExpectUnique = mDNStrue;
x->qTXT.ForceMCast = mDNSfalse;
x->qTXT.ReturnIntermed = mDNSfalse;
x->qTXT.SuppressUnusable = mDNSfalse;
x->qTXT.SearchListIndex = 0;
x->qTXT.AppendSearchDomains = 0;
x->qTXT.RetryWithSearchDomains = mDNSfalse;
x->qTXT.TimeoutQuestion = 0;
x->qTXT.WakeOnResolve = 0;
x->qTXT.qnameOrig = mDNSNULL;
x->qTXT.QuestionCallback = FoundServiceInfo;
x->qTXT.QuestionContext = x;
err = mDNS_StartQuery(&mDNSStorage, &x->qSRV);
if (err) { DNSServiceResolveDispose((mDNS_DirectOP*)x); errormsg = "mDNS_StartQuery qSRV"; goto fail; }
err = mDNS_StartQuery(&mDNSStorage, &x->qTXT);
if (err) { DNSServiceResolveDispose((mDNS_DirectOP*)x); errormsg = "mDNS_StartQuery qTXT"; goto fail; }
// Succeeded: Wrap up and return
*sdRef = (DNSServiceRef)x;
return(mStatus_NoError);
badparam:
err = mStatus_BadParamErr;
fail:
LogMsg("DNSServiceResolve(\"%s\", \"%s\", \"%s\") failed: %s (%ld)", name, regtype, domain, errormsg, err);
return(err);
}
//*************************************************************************************************************
// Connection-oriented calls
// Not yet implemented, so don't include in stub library
// We DO include it in the actual Extension, so that if a later client compiled to use this
// is run against this Extension, it will get a reasonable error code instead of just
// failing to launch (Strong Link) or calling an unresolved symbol and crashing (Weak Link)
#if !MDNS_BUILDINGSTUBLIBRARY
DNSServiceErrorType DNSServiceCreateConnection(DNSServiceRef *sdRef)
{
(void)sdRef; // Unused
return(kDNSServiceErr_Unsupported);
}
DNSServiceErrorType DNSServiceRegisterRecord
(
DNSServiceRef sdRef,
DNSRecordRef *RecordRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *fullname,
uint16_t rrtype,
uint16_t rrclass,
uint16_t rdlen,
const void *rdata,
uint32_t ttl,
DNSServiceRegisterRecordReply callback,
void *context /* may be NULL */
)
{
(void)sdRef; // Unused
(void)RecordRef; // Unused
(void)flags; // Unused
(void)interfaceIndex; // Unused
(void)fullname; // Unused
(void)rrtype; // Unused
(void)rrclass; // Unused
(void)rdlen; // Unused
(void)rdata; // Unused
(void)ttl; // Unused
(void)callback; // Unused
(void)context; // Unused
return(kDNSServiceErr_Unsupported);
}
#endif
//*************************************************************************************************************
// DNSServiceQueryRecord
static void DNSServiceQueryRecordDispose(mDNS_DirectOP *op)
{
mDNS_DirectOP_QueryRecord *x = (mDNS_DirectOP_QueryRecord*)op;
if (x->q.ThisQInterval >= 0) mDNS_StopQuery(&mDNSStorage, &x->q);
mDNSPlatformMemFree(x);
}
mDNSlocal void DNSServiceQueryRecordResponse(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
mDNS_DirectOP_QueryRecord *x = (mDNS_DirectOP_QueryRecord*)question->QuestionContext;
char fullname[MAX_ESCAPED_DOMAIN_NAME];
(void)m; // Unused
ConvertDomainNameToCString(answer->name, fullname);
x->callback((DNSServiceRef)x, AddRecord ? kDNSServiceFlagsAdd : (DNSServiceFlags)0, 0, kDNSServiceErr_NoError,
fullname, answer->rrtype, answer->rrclass, answer->rdlength, answer->rdata->u.data, answer->rroriginalttl, x->context);
}
DNSServiceErrorType DNSServiceQueryRecord
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *fullname,
uint16_t rrtype,
uint16_t rrclass,
DNSServiceQueryRecordReply callback,
void *context /* may be NULL */
)
{
mStatus err = mStatus_NoError;
const char *errormsg = "Unknown";
mDNS_DirectOP_QueryRecord *x;
(void)flags; // Unused
(void)interfaceIndex; // Unused
// Allocate memory, and handle failure
x = (mDNS_DirectOP_QueryRecord *)mDNSPlatformMemAllocate(sizeof(*x));
if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; }
// Set up object
x->disposefn = DNSServiceQueryRecordDispose;
x->callback = callback;
x->context = context;
x->q.ThisQInterval = -1; // So that DNSServiceResolveDispose() knows whether to cancel this question
x->q.InterfaceID = mDNSInterface_Any;
x->q.Target = zeroAddr;
MakeDomainNameFromDNSNameString(&x->q.qname, fullname);
x->q.qtype = rrtype;
x->q.qclass = rrclass;
x->q.LongLived = (flags & kDNSServiceFlagsLongLivedQuery) != 0;
x->q.ExpectUnique = mDNSfalse;
x->q.ForceMCast = (flags & kDNSServiceFlagsForceMulticast) != 0;
x->q.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
x->q.SuppressUnsable = (flags & kDNSServiceFlagsSuppressUnusable) != 0;
x->q.SearchListIndex = 0;
x->q.AppendSearchDomains = 0;
x->q.RetryWithSearchDomains = mDNSfalse;
x->q.WakeOnResolve = 0;
x->q.qnameOrig = mDNSNULL;
x->q.QuestionCallback = DNSServiceQueryRecordResponse;
x->q.QuestionContext = x;
err = mDNS_StartQuery(&mDNSStorage, &x->q);
if (err) { DNSServiceResolveDispose((mDNS_DirectOP*)x); errormsg = "mDNS_StartQuery"; goto fail; }
// Succeeded: Wrap up and return
*sdRef = (DNSServiceRef)x;
return(mStatus_NoError);
fail:
LogMsg("DNSServiceQueryRecord(\"%s\", %d, %d) failed: %s (%ld)", fullname, rrtype, rrclass, errormsg, err);
return(err);
}
//*************************************************************************************************************
// DNSServiceGetAddrInfo
static void DNSServiceGetAddrInfoDispose(mDNS_DirectOP *op)
{
mDNS_DirectOP_GetAddrInfo *x = (mDNS_DirectOP_GetAddrInfo*)op;
if (x->aQuery) DNSServiceRefDeallocate(x->aQuery);
mDNSPlatformMemFree(x);
}
static void DNSSD_API DNSServiceGetAddrInfoResponse(
DNSServiceRef inRef,
DNSServiceFlags inFlags,
uint32_t inInterfaceIndex,
DNSServiceErrorType inErrorCode,
const char * inFullName,
uint16_t inRRType,
uint16_t inRRClass,
uint16_t inRDLen,
const void * inRData,
uint32_t inTTL,
void * inContext )
{
mDNS_DirectOP_GetAddrInfo * x = (mDNS_DirectOP_GetAddrInfo*)inContext;
struct sockaddr_in sa4;
mDNSPlatformMemZero(&sa4, sizeof(sa4));
if (inErrorCode == kDNSServiceErr_NoError && inRRType == kDNSServiceType_A)
{
sa4.sin_family = AF_INET;
mDNSPlatformMemCopy(&sa4.sin_addr.s_addr, inRData, 4);
}
x->callback((DNSServiceRef)x, inFlags, inInterfaceIndex, inErrorCode, inFullName,
(const struct sockaddr *) &sa4, inTTL, x->context);
}
DNSServiceErrorType DNSSD_API DNSServiceGetAddrInfo(
DNSServiceRef * outRef,
DNSServiceFlags inFlags,
uint32_t inInterfaceIndex,
DNSServiceProtocol inProtocol,
const char * inHostName,
DNSServiceGetAddrInfoReply inCallback,
void * inContext )
{
const char * errormsg = "Unknown";
DNSServiceErrorType err;
mDNS_DirectOP_GetAddrInfo * x;
// Allocate memory, and handle failure
x = (mDNS_DirectOP_GetAddrInfo *)mDNSPlatformMemAllocate(sizeof(*x));
if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; }
// Set up object
x->disposefn = DNSServiceGetAddrInfoDispose;
x->callback = inCallback;
x->context = inContext;
x->aQuery = mDNSNULL;
// Start the query.
// (It would probably be more efficient to code this using mDNS_StartQuery directly,
// instead of wrapping DNSServiceQueryRecord, which then unnecessarily allocates
// more memory and then just calls through to mDNS_StartQuery. -- SC June 2010)
err = DNSServiceQueryRecord(&x->aQuery, inFlags, inInterfaceIndex, inHostName, kDNSServiceType_A,
kDNSServiceClass_IN, DNSServiceGetAddrInfoResponse, x);
if (err) { DNSServiceGetAddrInfoDispose((mDNS_DirectOP*)x); errormsg = "DNSServiceQueryRecord"; goto fail; }
*outRef = (DNSServiceRef)x;
return(mStatus_NoError);
fail:
LogMsg("DNSServiceGetAddrInfo(\"%s\", %d) failed: %s (%ld)", inHostName, inProtocol, errormsg, err);
return(err);
}
//*************************************************************************************************************
// DNSServiceReconfirmRecord
// Not yet implemented, so don't include in stub library
// We DO include it in the actual Extension, so that if a later client compiled to use this
// is run against this Extension, it will get a reasonable error code instead of just
// failing to launch (Strong Link) or calling an unresolved symbol and crashing (Weak Link)
#if !MDNS_BUILDINGSTUBLIBRARY
DNSServiceErrorType DNSSD_API DNSServiceReconfirmRecord
(
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *fullname,
uint16_t rrtype,
uint16_t rrclass,
uint16_t rdlen,
const void *rdata
)
{
(void)flags; // Unused
(void)interfaceIndex; // Unused
(void)fullname; // Unused
(void)rrtype; // Unused
(void)rrclass; // Unused
(void)rdlen; // Unused
(void)rdata; // Unused
return(kDNSServiceErr_Unsupported);
}
#endif