qdnslookup.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2012 Jeremy Lainé <jeremy.laine@m4x.org>-
4** Contact: https://www.qt.io/licensing/-
5**-
6** This file is part of the QtNetwork module of the Qt Toolkit.-
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38****************************************************************************/-
39-
40#include "qdnslookup.h"-
41#include "qdnslookup_p.h"-
42-
43#include <qcoreapplication.h>-
44#include <qdatetime.h>-
45#include <qthreadstorage.h>-
46#include <qurl.h>-
47-
48#include <algorithm>-
49-
50QT_BEGIN_NAMESPACE-
51-
52Q_GLOBAL_STATIC(QDnsLookupThreadPool, theDnsLookupThreadPool);-
53Q_GLOBAL_STATIC(QThreadStorage<bool *>, theDnsLookupSeedStorage);-
54-
55static bool qt_qdnsmailexchangerecord_less_than(const QDnsMailExchangeRecord &r1, const QDnsMailExchangeRecord &r2)-
56{-
57 // Lower numbers are more preferred than higher ones.-
58 return r1.preference() < r2.preference();-
59}-
60-
61/*!-
62 Sorts a list of QDnsMailExchangeRecord objects according to RFC 5321.-
63*/-
64-
65static void qt_qdnsmailexchangerecord_sort(QList<QDnsMailExchangeRecord> &records)-
66{-
67 // If we have no more than one result, we are done.-
68 if (records.size() <= 1)
records.size() <= 1Description
TRUEevaluated 80 times by 2 tests
Evaluated by:
  • tst_qdnslookup - unknown status
  • tst_qdnslookup_appless - unknown status
FALSEevaluated 4 times by 1 test
Evaluated by:
  • tst_qdnslookup - unknown status
4-80
69 return;
executed 80 times by 2 tests: return;
Executed by:
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80
70-
71 // Order the records by preference.-
72 std::sort(records.begin(), records.end(), qt_qdnsmailexchangerecord_less_than);-
73-
74 int i = 0;-
75 while (i < records.size()) {
i < records.size()Description
TRUEevaluated 6 times by 1 test
Evaluated by:
  • tst_qdnslookup - unknown status
FALSEevaluated 4 times by 1 test
Evaluated by:
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4-6
76-
77 // Determine the slice of records with the current preference.-
78 QList<QDnsMailExchangeRecord> slice;-
79 const quint16 slicePreference = records[.at(i].).preference();-
80 for (int j = i; j < records.size(); ++j) {
j < records.size()Description
TRUEevaluated 10 times by 1 test
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FALSEevaluated 4 times by 1 test
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4-10
81 if (records[.at(j].).preference() != slicePreference)
records.at(j)....licePreferenceDescription
TRUEevaluated 2 times by 1 test
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FALSEevaluated 8 times by 1 test
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2-8
82 break;
executed 2 times by 1 test: break;
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2
83 slice << records[.at(j];);-
84 }
executed 8 times by 1 test: end of block
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8
85-
86 // Randomize the slice of records.-
87 while (!slice.isEmpty()) {
!slice.isEmpty()Description
TRUEevaluated 8 times by 1 test
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FALSEevaluated 6 times by 1 test
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6-8
88 const unsigned int pos = qrand() % slice.size();-
89 records[i++] = slice.takeAt(pos);-
90 }
executed 8 times by 1 test: end of block
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8
91 }
executed 6 times by 1 test: end of block
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92}
executed 4 times by 1 test: end of block
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4
93-
94static bool qt_qdnsservicerecord_less_than(const QDnsServiceRecord &r1, const QDnsServiceRecord &r2)-
95{-
96 // Order by priority, or if the priorities are equal,-
97 // put zero weight records first.-
98 return r1.priority() < r2.priority()-
99 || (r1.priority() == r2.priority()-
100 && r1.weight() == 0 && r2.weight() > 0);-
101}-
102-
103/*!-
104 Sorts a list of QDnsServiceRecord objects according to RFC 2782.-
105*/-
106-
107static void qt_qdnsservicerecord_sort(QList<QDnsServiceRecord> &records)-
108{-
109 // If we have no more than one result, we are done.-
110 if (records.size() <= 1)
records.size() <= 1Description
TRUEevaluated 78 times by 2 tests
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FALSEevaluated 6 times by 1 test
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6-78
111 return;
executed 78 times by 2 tests: return;
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78
112-
113 // Order the records by priority, and for records with an equal-
114 // priority, put records with a zero weight first.-
115 std::sort(records.begin(), records.end(), qt_qdnsservicerecord_less_than);-
116-
117 int i = 0;-
118 while (i < records.size()) {
i < records.size()Description
TRUEevaluated 12 times by 1 test
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FALSEevaluated 6 times by 1 test
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6-12
119-
120 // Determine the slice of records with the current priority.-
121 QList<QDnsServiceRecord> slice;-
122 const quint16 slicePriority = records[.at(i].).priority();-
123 unsigned int sliceWeight = 0;-
124 for (int j = i; j < records.size(); ++j) {
j < records.size()Description
TRUEevaluated 22 times by 1 test
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FALSEevaluated 6 times by 1 test
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6-22
125 if (records[.at(j].).priority() != slicePriority)
records.at(j).... slicePriorityDescription
TRUEevaluated 6 times by 1 test
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FALSEevaluated 16 times by 1 test
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6-16
126 break;
executed 6 times by 1 test: break;
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6
127 sliceWeight += records[.at(j].).weight();-
128 slice << records[.at(j];);-
129 }
executed 16 times by 1 test: end of block
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16
130#ifdef QDNSLOOKUP_DEBUG-
131 qDebug("qt_qdnsservicerecord_sort() : priority %i (size: %i, total weight: %i)",-
132 slicePriority, slice.size(), sliceWeight);-
133#endif-
134-
135 // Order the slice of records.-
136 while (!slice.isEmpty()) {
!slice.isEmpty()Description
TRUEevaluated 16 times by 1 test
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FALSEevaluated 12 times by 1 test
Evaluated by:
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12-16
137 const unsigned int weightThreshold = qrand() % (sliceWeight + 1);-
138 unsigned int summedWeight = 0;-
139 for (int j = 0; j < slice.size(); ++j) {
j < slice.size()Description
TRUEevaluated 19 times by 1 test
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FALSEnever evaluated
0-19
140 summedWeight += slice[.at(j].).weight();-
141 if (summedWeight >= weightThreshold) {
summedWeight >...eightThresholdDescription
TRUEevaluated 16 times by 1 test
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FALSEevaluated 3 times by 1 test
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3-16
142#ifdef QDNSLOOKUP_DEBUG-
143 qDebug("qt_qdnsservicerecord_sort() : adding %s %i (weight: %i)",-
144 qPrintable(slice[.at(j].).target()), slice[.at(j].).port(),-
145 slice[.at(j].).weight());-
146#endif-
147 // Adjust the slice weight and take the current record.-
148 sliceWeight -= slice[.at(j].).weight();-
149 records[i++] = slice.takeAt(j);-
150 break;
executed 16 times by 1 test: break;
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16
151 }-
152 }
executed 3 times by 1 test: end of block
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3
153 }
executed 16 times by 1 test: end of block
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16
154 }
executed 12 times by 1 test: end of block
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12
155}
executed 6 times by 1 test: end of block
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6
156-
157const char *QDnsLookupPrivate::msgNoIpV6NameServerAdresses =-
158 QT_TRANSLATE_NOOP("QDnsLookupRunnable", "IPv6 addresses for nameservers are currently not supported");-
159-
160/*!-
161 \class QDnsLookup-
162 \brief The QDnsLookup class represents a DNS lookup.-
163 \since 5.0-
164-
165 \inmodule QtNetwork-
166 \ingroup network-
167-
168 QDnsLookup uses the mechanisms provided by the operating system to perform-
169 DNS lookups. To perform a lookup you need to specify a \l name and \l type-
170 then invoke the \l{QDnsLookup::lookup()}{lookup()} slot. The-
171 \l{QDnsLookup::finished()}{finished()} signal will be emitted upon-
172 completion.-
173-
174 For example, you can determine which servers an XMPP chat client should-
175 connect to for a given domain with:-
176-
177 \snippet code/src_network_kernel_qdnslookup.cpp 0-
178-
179 Once the request finishes you can handle the results with:-
180-
181 \snippet code/src_network_kernel_qdnslookup.cpp 1-
182-
183 \note If you simply want to find the IP address(es) associated with a host-
184 name, or the host name associated with an IP address you should use-
185 QHostInfo instead.-
186*/-
187-
188/*!-
189 \enum QDnsLookup::Error-
190-
191 Indicates all possible error conditions found during the-
192 processing of the DNS lookup.-
193-
194 \value NoError no error condition.-
195-
196 \value ResolverError there was an error initializing the system's-
197 DNS resolver.-
198-
199 \value OperationCancelledError the lookup was aborted using the abort()-
200 method.-
201-
202 \value InvalidRequestError the requested DNS lookup was invalid.-
203-
204 \value InvalidReplyError the reply returned by the server was invalid.-
205-
206 \value ServerFailureError the server encountered an internal failure-
207 while processing the request (SERVFAIL).-
208-
209 \value ServerRefusedError the server refused to process the request for-
210 security or policy reasons (REFUSED).-
211-
212 \value NotFoundError the requested domain name does not exist-
213 (NXDOMAIN).-
214*/-
215-
216/*!-
217 \enum QDnsLookup::Type-
218-
219 Indicates the type of DNS lookup that was performed.-
220-
221 \value A IPv4 address records.-
222-
223 \value AAAA IPv6 address records.-
224-
225 \value ANY any records.-
226-
227 \value CNAME canonical name records.-
228-
229 \value MX mail exchange records.-
230-
231 \value NS name server records.-
232-
233 \value PTR pointer records.-
234-
235 \value SRV service records.-
236-
237 \value TXT text records.-
238*/-
239-
240/*!-
241 \fn void QDnsLookup::finished()-
242-
243 This signal is emitted when the reply has finished processing.-
244*/-
245-
246/*!-
247 \fn void QDnsLookup::nameChanged(const QString &name)-
248-
249 This signal is emitted when the lookup \l name changes.-
250 \a name is the new lookup name.-
251*/-
252-
253/*!-
254 \fn void QDnsLookup::typeChanged(Type type)-
255-
256 This signal is emitted when the lookup \l type changes.-
257 \a type is the new lookup type.-
258*/-
259-
260/*!-
261 Constructs a QDnsLookup object and sets \a parent as the parent object.-
262-
263 The \l type property will default to QDnsLookup::A.-
264*/-
265-
266QDnsLookup::QDnsLookup(QObject *parent)-
267 : QObject(*new QDnsLookupPrivate, parent)-
268{-
269 qRegisterMetaType<QDnsLookupReply>();-
270}-
271/*!-
272 Constructs a QDnsLookup object for the given \a type and \a name and sets-
273 \a parent as the parent object.-
274*/-
275-
276QDnsLookup::QDnsLookup(Type type, const QString &name, QObject *parent)-
277 : QObject(*new QDnsLookupPrivate, parent)-
278{-
279 Q_D(QDnsLookup);-
280 qRegisterMetaType<QDnsLookupReply>();-
281 d->name = name;-
282 d->type = type;-
283}-
284-
285/*!-
286 \fn QDnsLookup::QDnsLookup(Type type, const QString &name, const QHostAddress &nameserver, QObject *parent)-
287 \since 5.4-
288 Constructs a QDnsLookup object for the given \a type, \a name and-
289 \a nameserver and sets \a parent as the parent object.-
290*/-
291-
292QDnsLookup::QDnsLookup(Type type, const QString &name, const QHostAddress &nameserver, QObject *parent)-
293 : QObject(*new QDnsLookupPrivate, parent)-
294{-
295 Q_D(QDnsLookup);-
296 qRegisterMetaType<QDnsLookupReply>();-
297 d->name = name;-
298 d->type = type;-
299 d->nameserver = nameserver;-
300}-
301-
302/*!-
303 Destroys the QDnsLookup object.-
304-
305 It is safe to delete a QDnsLookup object even if it is not finished, you-
306 will simply never receive its results.-
307*/-
308-
309QDnsLookup::~QDnsLookup()-
310{-
311}-
312-
313/*!-
314 \property QDnsLookup::error-
315 \brief the type of error that occurred if the DNS lookup failed, or NoError.-
316*/-
317-
318QDnsLookup::Error QDnsLookup::error() const-
319{-
320 return d_func()->reply.error;-
321}-
322-
323/*!-
324 \property QDnsLookup::errorString-
325 \brief a human-readable description of the error if the DNS lookup failed.-
326*/-
327-
328QString QDnsLookup::errorString() const-
329{-
330 return d_func()->reply.errorString;-
331}-
332-
333/*!-
334 Returns whether the reply has finished or was aborted.-
335*/-
336-
337bool QDnsLookup::isFinished() const-
338{-
339 return d_func()->isFinished;-
340}-
341-
342/*!-
343 \property QDnsLookup::name-
344 \brief the name to lookup.-
345-
346 \note The name will be encoded using IDNA, which means it's unsuitable for-
347 querying SRV records compatible with the DNS-SD specification.-
348*/-
349-
350QString QDnsLookup::name() const-
351{-
352 return d_func()->name;-
353}-
354-
355void QDnsLookup::setName(const QString &name)-
356{-
357 Q_D(QDnsLookup);-
358 if (name != d->name) {-
359 d->name = name;-
360 emit nameChanged(name);-
361 }-
362}-
363-
364/*!-
365 \property QDnsLookup::type-
366 \brief the type of DNS lookup.-
367*/-
368-
369QDnsLookup::Type QDnsLookup::type() const-
370{-
371 return d_func()->type;-
372}-
373-
374void QDnsLookup::setType(Type type)-
375{-
376 Q_D(QDnsLookup);-
377 if (type != d->type) {-
378 d->type = type;-
379 emit typeChanged(type);-
380 }-
381}-
382-
383/*!-
384 \property QDnsLookup::nameserver-
385 \brief the nameserver to use for DNS lookup.-
386*/-
387-
388QHostAddress QDnsLookup::nameserver() const-
389{-
390 return d_func()->nameserver;-
391}-
392-
393void QDnsLookup::setNameserver(const QHostAddress &nameserver)-
394{-
395 Q_D(QDnsLookup);-
396 if (nameserver != d->nameserver) {-
397 d->nameserver = nameserver;-
398 emit nameserverChanged(nameserver);-
399 }-
400}-
401-
402/*!-
403 Returns the list of canonical name records associated with this lookup.-
404*/-
405-
406QList<QDnsDomainNameRecord> QDnsLookup::canonicalNameRecords() const-
407{-
408 return d_func()->reply.canonicalNameRecords;-
409}-
410-
411/*!-
412 Returns the list of host address records associated with this lookup.-
413*/-
414-
415QList<QDnsHostAddressRecord> QDnsLookup::hostAddressRecords() const-
416{-
417 return d_func()->reply.hostAddressRecords;-
418}-
419-
420/*!-
421 Returns the list of mail exchange records associated with this lookup.-
422-
423 The records are sorted according to-
424 \l{http://www.rfc-editor.org/rfc/rfc5321.txt}{RFC 5321}, so if you use them-
425 to connect to servers, you should try them in the order they are listed.-
426*/-
427-
428QList<QDnsMailExchangeRecord> QDnsLookup::mailExchangeRecords() const-
429{-
430 return d_func()->reply.mailExchangeRecords;-
431}-
432-
433/*!-
434 Returns the list of name server records associated with this lookup.-
435*/-
436-
437QList<QDnsDomainNameRecord> QDnsLookup::nameServerRecords() const-
438{-
439 return d_func()->reply.nameServerRecords;-
440}-
441-
442/*!-
443 Returns the list of pointer records associated with this lookup.-
444*/-
445-
446QList<QDnsDomainNameRecord> QDnsLookup::pointerRecords() const-
447{-
448 return d_func()->reply.pointerRecords;-
449}-
450-
451/*!-
452 Returns the list of service records associated with this lookup.-
453-
454 The records are sorted according to-
455 \l{http://www.rfc-editor.org/rfc/rfc2782.txt}{RFC 2782}, so if you use them-
456 to connect to servers, you should try them in the order they are listed.-
457*/-
458-
459QList<QDnsServiceRecord> QDnsLookup::serviceRecords() const-
460{-
461 return d_func()->reply.serviceRecords;-
462}-
463-
464/*!-
465 Returns the list of text records associated with this lookup.-
466*/-
467-
468QList<QDnsTextRecord> QDnsLookup::textRecords() const-
469{-
470 return d_func()->reply.textRecords;-
471}-
472-
473/*!-
474 Aborts the DNS lookup operation.-
475-
476 If the lookup is already finished, does nothing.-
477*/-
478-
479void QDnsLookup::abort()-
480{-
481 Q_D(QDnsLookup);-
482 if (d->runnable) {-
483 d->runnable = 0;-
484 d->reply = QDnsLookupReply();-
485 d->reply.error = QDnsLookup::OperationCancelledError;-
486 d->reply.errorString = tr("Operation cancelled");-
487 d->isFinished = true;-
488 emit finished();-
489 }-
490}-
491-
492/*!-
493 Performs the DNS lookup.-
494-
495 The \l{QDnsLookup::finished()}{finished()} signal is emitted upon completion.-
496*/-
497-
498void QDnsLookup::lookup()-
499{-
500 Q_D(QDnsLookup);-
501 d->isFinished = false;-
502 d->reply = QDnsLookupReply();-
503 d->runnable = new QDnsLookupRunnable(d->type, QUrl::toAce(d->name), d->nameserver);-
504 connect(d->runnable, SIGNAL(finished(QDnsLookupReply)),-
505 this, SLOT(_q_lookupFinished(QDnsLookupReply)),-
506 Qt::BlockingQueuedConnection);-
507 theDnsLookupThreadPool()->start(d->runnable);-
508}-
509-
510/*!-
511 \class QDnsDomainNameRecord-
512 \brief The QDnsDomainNameRecord class stores information about a domain-
513 name record.-
514-
515 \inmodule QtNetwork-
516 \ingroup network-
517 \ingroup shared-
518-
519 When performing a name server lookup, zero or more records will be returned.-
520 Each record is represented by a QDnsDomainNameRecord instance.-
521-
522 \sa QDnsLookup-
523*/-
524-
525/*!-
526 Constructs an empty domain name record object.-
527*/-
528-
529QDnsDomainNameRecord::QDnsDomainNameRecord()-
530 : d(new QDnsDomainNameRecordPrivate)-
531{-
532}-
533-
534/*!-
535 Constructs a copy of \a other.-
536*/-
537-
538QDnsDomainNameRecord::QDnsDomainNameRecord(const QDnsDomainNameRecord &other)-
539 : d(other.d)-
540{-
541}-
542-
543/*!-
544 Destroys a domain name record.-
545*/-
546-
547QDnsDomainNameRecord::~QDnsDomainNameRecord()-
548{-
549}-
550-
551/*!-
552 Returns the name for this record.-
553*/-
554-
555QString QDnsDomainNameRecord::name() const-
556{-
557 return d->name;-
558}-
559-
560/*!-
561 Returns the duration in seconds for which this record is valid.-
562*/-
563-
564quint32 QDnsDomainNameRecord::timeToLive() const-
565{-
566 return d->timeToLive;-
567}-
568-
569/*!-
570 Returns the value for this domain name record.-
571*/-
572-
573QString QDnsDomainNameRecord::value() const-
574{-
575 return d->value;-
576}-
577-
578/*!-
579 Assigns the data of the \a other object to this record object,-
580 and returns a reference to it.-
581*/-
582-
583QDnsDomainNameRecord &QDnsDomainNameRecord::operator=(const QDnsDomainNameRecord &other)-
584{-
585 d = other.d;-
586 return *this;-
587}-
588/*!-
589 \fn void QDnsDomainNameRecord::swap(QDnsDomainNameRecord &other)-
590-
591 Swaps this domain-name record instance with \a other. This-
592 function is very fast and never fails.-
593*/-
594-
595/*!-
596 \class QDnsHostAddressRecord-
597 \brief The QDnsHostAddressRecord class stores information about a host-
598 address record.-
599-
600 \inmodule QtNetwork-
601 \ingroup network-
602 \ingroup shared-
603-
604 When performing an address lookup, zero or more records will be-
605 returned. Each record is represented by a QDnsHostAddressRecord instance.-
606-
607 \sa QDnsLookup-
608*/-
609-
610/*!-
611 Constructs an empty host address record object.-
612*/-
613-
614QDnsHostAddressRecord::QDnsHostAddressRecord()-
615 : d(new QDnsHostAddressRecordPrivate)-
616{-
617}-
618-
619/*!-
620 Constructs a copy of \a other.-
621*/-
622-
623QDnsHostAddressRecord::QDnsHostAddressRecord(const QDnsHostAddressRecord &other)-
624 : d(other.d)-
625{-
626}-
627-
628/*!-
629 Destroys a host address record.-
630*/-
631-
632QDnsHostAddressRecord::~QDnsHostAddressRecord()-
633{-
634}-
635-
636/*!-
637 Returns the name for this record.-
638*/-
639-
640QString QDnsHostAddressRecord::name() const-
641{-
642 return d->name;-
643}-
644-
645/*!-
646 Returns the duration in seconds for which this record is valid.-
647*/-
648-
649quint32 QDnsHostAddressRecord::timeToLive() const-
650{-
651 return d->timeToLive;-
652}-
653-
654/*!-
655 Returns the value for this host address record.-
656*/-
657-
658QHostAddress QDnsHostAddressRecord::value() const-
659{-
660 return d->value;-
661}-
662-
663/*!-
664 Assigns the data of the \a other object to this record object,-
665 and returns a reference to it.-
666*/-
667-
668QDnsHostAddressRecord &QDnsHostAddressRecord::operator=(const QDnsHostAddressRecord &other)-
669{-
670 d = other.d;-
671 return *this;-
672}-
673/*!-
674 \fn void QDnsHostAddressRecord::swap(QDnsHostAddressRecord &other)-
675-
676 Swaps this host address record instance with \a other. This-
677 function is very fast and never fails.-
678*/-
679-
680/*!-
681 \class QDnsMailExchangeRecord-
682 \brief The QDnsMailExchangeRecord class stores information about a DNS MX record.-
683-
684 \inmodule QtNetwork-
685 \ingroup network-
686 \ingroup shared-
687-
688 When performing a lookup on a service, zero or more records will be-
689 returned. Each record is represented by a QDnsMailExchangeRecord instance.-
690-
691 The meaning of the fields is defined in-
692 \l{http://www.rfc-editor.org/rfc/rfc1035.txt}{RFC 1035}.-
693-
694 \sa QDnsLookup-
695*/-
696-
697/*!-
698 Constructs an empty mail exchange record object.-
699*/-
700-
701QDnsMailExchangeRecord::QDnsMailExchangeRecord()-
702 : d(new QDnsMailExchangeRecordPrivate)-
703{-
704}-
705-
706/*!-
707 Constructs a copy of \a other.-
708*/-
709-
710QDnsMailExchangeRecord::QDnsMailExchangeRecord(const QDnsMailExchangeRecord &other)-
711 : d(other.d)-
712{-
713}-
714-
715/*!-
716 Destroys a mail exchange record.-
717*/-
718-
719QDnsMailExchangeRecord::~QDnsMailExchangeRecord()-
720{-
721}-
722-
723/*!-
724 Returns the domain name of the mail exchange for this record.-
725*/-
726-
727QString QDnsMailExchangeRecord::exchange() const-
728{-
729 return d->exchange;-
730}-
731-
732/*!-
733 Returns the name for this record.-
734*/-
735-
736QString QDnsMailExchangeRecord::name() const-
737{-
738 return d->name;-
739}-
740-
741/*!-
742 Returns the preference for this record.-
743*/-
744-
745quint16 QDnsMailExchangeRecord::preference() const-
746{-
747 return d->preference;-
748}-
749-
750/*!-
751 Returns the duration in seconds for which this record is valid.-
752*/-
753-
754quint32 QDnsMailExchangeRecord::timeToLive() const-
755{-
756 return d->timeToLive;-
757}-
758-
759/*!-
760 Assigns the data of the \a other object to this record object,-
761 and returns a reference to it.-
762*/-
763-
764QDnsMailExchangeRecord &QDnsMailExchangeRecord::operator=(const QDnsMailExchangeRecord &other)-
765{-
766 d = other.d;-
767 return *this;-
768}-
769/*!-
770 \fn void QDnsMailExchangeRecord::swap(QDnsMailExchangeRecord &other)-
771-
772 Swaps this mail exchange record with \a other. This function is-
773 very fast and never fails.-
774*/-
775-
776/*!-
777 \class QDnsServiceRecord-
778 \brief The QDnsServiceRecord class stores information about a DNS SRV record.-
779-
780 \inmodule QtNetwork-
781 \ingroup network-
782 \ingroup shared-
783-
784 When performing a lookup on a service, zero or more records will be-
785 returned. Each record is represented by a QDnsServiceRecord instance.-
786-
787 The meaning of the fields is defined in-
788 \l{http://www.rfc-editor.org/rfc/rfc2782.txt}{RFC 2782}.-
789-
790 \sa QDnsLookup-
791*/-
792-
793/*!-
794 Constructs an empty service record object.-
795*/-
796-
797QDnsServiceRecord::QDnsServiceRecord()-
798 : d(new QDnsServiceRecordPrivate)-
799{-
800}-
801-
802/*!-
803 Constructs a copy of \a other.-
804*/-
805-
806QDnsServiceRecord::QDnsServiceRecord(const QDnsServiceRecord &other)-
807 : d(other.d)-
808{-
809}-
810-
811/*!-
812 Destroys a service record.-
813*/-
814-
815QDnsServiceRecord::~QDnsServiceRecord()-
816{-
817}-
818-
819/*!-
820 Returns the name for this record.-
821*/-
822-
823QString QDnsServiceRecord::name() const-
824{-
825 return d->name;-
826}-
827-
828/*!-
829 Returns the port on the target host for this service record.-
830*/-
831-
832quint16 QDnsServiceRecord::port() const-
833{-
834 return d->port;-
835}-
836-
837/*!-
838 Returns the priority for this service record.-
839-
840 A client must attempt to contact the target host with the lowest-numbered-
841 priority.-
842*/-
843-
844quint16 QDnsServiceRecord::priority() const-
845{-
846 return d->priority;-
847}-
848-
849/*!-
850 Returns the domain name of the target host for this service record.-
851*/-
852-
853QString QDnsServiceRecord::target() const-
854{-
855 return d->target;-
856}-
857-
858/*!-
859 Returns the duration in seconds for which this record is valid.-
860*/-
861-
862quint32 QDnsServiceRecord::timeToLive() const-
863{-
864 return d->timeToLive;-
865}-
866-
867/*!-
868 Returns the weight for this service record.-
869-
870 The weight field specifies a relative weight for entries with the same-
871 priority. Entries with higher weights should be selected with a higher-
872 probability.-
873*/-
874-
875quint16 QDnsServiceRecord::weight() const-
876{-
877 return d->weight;-
878}-
879-
880/*!-
881 Assigns the data of the \a other object to this record object,-
882 and returns a reference to it.-
883*/-
884-
885QDnsServiceRecord &QDnsServiceRecord::operator=(const QDnsServiceRecord &other)-
886{-
887 d = other.d;-
888 return *this;-
889}-
890/*!-
891 \fn void QDnsServiceRecord::swap(QDnsServiceRecord &other)-
892-
893 Swaps this service record instance with \a other. This function is-
894 very fast and never fails.-
895*/-
896-
897/*!-
898 \class QDnsTextRecord-
899 \brief The QDnsTextRecord class stores information about a DNS TXT record.-
900-
901 \inmodule QtNetwork-
902 \ingroup network-
903 \ingroup shared-
904-
905 When performing a text lookup, zero or more records will be-
906 returned. Each record is represented by a QDnsTextRecord instance.-
907-
908 The meaning of the fields is defined in-
909 \l{http://www.rfc-editor.org/rfc/rfc1035.txt}{RFC 1035}.-
910-
911 \sa QDnsLookup-
912*/-
913-
914/*!-
915 Constructs an empty text record object.-
916*/-
917-
918QDnsTextRecord::QDnsTextRecord()-
919 : d(new QDnsTextRecordPrivate)-
920{-
921}-
922-
923/*!-
924 Constructs a copy of \a other.-
925*/-
926-
927QDnsTextRecord::QDnsTextRecord(const QDnsTextRecord &other)-
928 : d(other.d)-
929{-
930}-
931-
932/*!-
933 Destroys a text record.-
934*/-
935-
936QDnsTextRecord::~QDnsTextRecord()-
937{-
938}-
939-
940/*!-
941 Returns the name for this text record.-
942*/-
943-
944QString QDnsTextRecord::name() const-
945{-
946 return d->name;-
947}-
948-
949/*!-
950 Returns the duration in seconds for which this record is valid.-
951*/-
952-
953quint32 QDnsTextRecord::timeToLive() const-
954{-
955 return d->timeToLive;-
956}-
957-
958/*!-
959 Returns the values for this text record.-
960*/-
961-
962QList<QByteArray> QDnsTextRecord::values() const-
963{-
964 return d->values;-
965}-
966-
967/*!-
968 Assigns the data of the \a other object to this record object,-
969 and returns a reference to it.-
970*/-
971-
972QDnsTextRecord &QDnsTextRecord::operator=(const QDnsTextRecord &other)-
973{-
974 d = other.d;-
975 return *this;-
976}-
977/*!-
978 \fn void QDnsTextRecord::swap(QDnsTextRecord &other)-
979-
980 Swaps this text record instance with \a other. This function is-
981 very fast and never fails.-
982*/-
983-
984void QDnsLookupPrivate::_q_lookupFinished(const QDnsLookupReply &_reply)-
985{-
986 Q_Q(QDnsLookup);-
987 if (runnable == q->sender()) {-
988#ifdef QDNSLOOKUP_DEBUG-
989 qDebug("DNS reply for %s: %i (%s)", qPrintable(name), _reply.error, qPrintable(_reply.errorString));-
990#endif-
991 reply = _reply;-
992 runnable = 0;-
993 isFinished = true;-
994 emit q->finished();-
995 }-
996}-
997-
998void QDnsLookupRunnable::run()-
999{-
1000 QDnsLookupReply reply;-
1001-
1002 // Validate input.-
1003 if (requestName.isEmpty()) {-
1004 reply.error = QDnsLookup::InvalidRequestError;-
1005 reply.errorString = tr("Invalid domain name");-
1006 emit finished(reply);-
1007 return;-
1008 }-
1009-
1010 // Perform request.-
1011 query(requestType, requestName, nameserver, &reply);-
1012-
1013 // Sort results.-
1014 if (!theDnsLookupSeedStorage()->hasLocalData()) {-
1015 qsrand(QTime(0,0,0).msecsTo(QTime::currentTime()) ^ reinterpret_cast<quintptr>(this));-
1016 theDnsLookupSeedStorage()->setLocalData(new bool(true));-
1017 }-
1018 qt_qdnsmailexchangerecord_sort(reply.mailExchangeRecords);-
1019 qt_qdnsservicerecord_sort(reply.serviceRecords);-
1020-
1021 emit finished(reply);-
1022}-
1023-
1024QDnsLookupThreadPool::QDnsLookupThreadPool()-
1025 : signalsConnected(false)-
1026{-
1027 // Run up to 5 lookups in parallel.-
1028 setMaxThreadCount(5);-
1029}-
1030-
1031void QDnsLookupThreadPool::start(QRunnable *runnable)-
1032{-
1033 // Ensure threads complete at application destruction.-
1034 if (!signalsConnected) {-
1035 QMutexLocker signalsLocker(&signalsMutex);-
1036 if (!signalsConnected) {-
1037 QCoreApplication *app = QCoreApplication::instance();-
1038 if (!app) {-
1039 qWarning("QDnsLookup requires a QCoreApplication");-
1040 delete runnable;-
1041 return;-
1042 }-
1043-
1044 moveToThread(app->thread());-
1045 connect(app, SIGNAL(destroyed()),-
1046 SLOT(_q_applicationDestroyed()), Qt::DirectConnection);-
1047 signalsConnected = true;-
1048 }-
1049 }-
1050-
1051 QThreadPool::start(runnable);-
1052}-
1053-
1054void QDnsLookupThreadPool::_q_applicationDestroyed()-
1055{-
1056 waitForDone();-
1057 signalsConnected = false;-
1058}-
1059-
1060QT_END_NAMESPACE-
1061-
1062#include "moc_qdnslookup.cpp"-
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