FEAT(client/server): use native mDNS/DNS-SD API on Windows, if available

This allows:

- The client to find servers advertized via zeroconf without the need for Bonjour to be installed.
- The server to advertize itself via zeroconf without the need for Bonjour to be installed.

The Win32 API was introduced in the version 10.0.18362.0 (1903/19H1) of Windows SDK. Before that, only the UWP interface was available (introduced in Windows 10 1507).

This commit was successfully tested on Windows 10 1809, which probably means that the API can be used on previous versions as well.

Even if that isn't the case, it's not a problem: if the code fails to load the required symbols, it falls back to Bonjour.

"Q_OS_WIN64" is used instead of "Q_OS_WIN" because of an issue that appears when certain DNS functions are used in an x86 (32 bit) build:

This means that until the issue is fixed we can safely use the native mDNS-DNS-SD API only on x86_64 (64 bit).

Author: davidebeatrici

src/mumble/ConnectDialog.cpp

@@ -7,8 +7,6 @@
 
 #ifdef USE_ZEROCONF
 #	include "Zeroconf.h"
-#	include "BonjourServiceBrowser.h"
-#	include "BonjourServiceResolver.h"
 #endif
 
 #include "Channel.h"
@@ -1033,22 +1031,16 @@ ConnectDialog::ConnectDialog(QWidget *p, bool autoconnect) : QDialog(p), bAutoCo
 		startDns(si);
 		qtwServers->siFavorite->addServerItem(si);
 	}
-
 #ifdef USE_ZEROCONF
-	// Make sure the we got the objects we need, then wire them up
-	if (bAllowZeroconf && g.zeroconf->bsbBrowser && g.zeroconf->bsrResolver) {
-		connect(g.zeroconf->bsbBrowser.data(), SIGNAL(error(DNSServiceErrorType)), this,
-				SLOT(onLanBrowseError(DNSServiceErrorType)));
-		connect(g.zeroconf->bsbBrowser.data(), SIGNAL(currentBonjourRecordsChanged(const QList< BonjourRecord > &)),
-				this, SLOT(onUpdateLanList(const QList< BonjourRecord > &)));
-		connect(g.zeroconf->bsrResolver.data(), SIGNAL(error(BonjourRecord, DNSServiceErrorType)), this,
-				SLOT(onLanResolveError(BonjourRecord, DNSServiceErrorType)));
-		connect(g.zeroconf->bsrResolver.data(), SIGNAL(bonjourRecordResolved(BonjourRecord, QString, int)), this,
-				SLOT(onResolved(BonjourRecord, QString, int)));
-		onUpdateLanList(g.zeroconf->bsbBrowser->currentRecords());
+	if (bAllowZeroconf && g.zeroconf && g.zeroconf->isOk()) {
+		connect(g.zeroconf, &Zeroconf::recordsChanged, this, &ConnectDialog::onUpdateLanList);
+		connect(g.zeroconf, &Zeroconf::recordResolved, this, &ConnectDialog::onResolved);
+		connect(g.zeroconf, &Zeroconf::resolveError, this, &ConnectDialog::onLanResolveError);
+		onUpdateLanList(g.zeroconf->currentRecords());
+
+		g.zeroconf->startBrowser(QLatin1String("_mumble._tcp"));
 	}
 #endif
-
 	qtPingTick = new QTimer(this);
 	connect(qtPingTick, SIGNAL(timeout()), this, SLOT(timeTick()));
 
@@ -1082,6 +1074,12 @@ ConnectDialog::ConnectDialog(QWidget *p, bool autoconnect) : QDialog(p), bAutoCo
 }
 
 ConnectDialog::~ConnectDialog() {
+#ifdef USE_ZEROCONF
+	if (bAllowZeroconf && g.zeroconf && g.zeroconf->isOk()) {
+		g.zeroconf->stopBrowser();
+		g.zeroconf->cleanupResolvers();
+	}
+#endif
 	ServerItem::qmIcons.clear();
 
 	QList< FavoriteServer > ql;
@@ -1356,7 +1354,7 @@ void ConnectDialog::initList() {
 }
 
 #ifdef USE_ZEROCONF
-void ConnectDialog::onResolved(BonjourRecord record, QString host, int port) {
+void ConnectDialog::onResolved(const BonjourRecord record, const QString host, const uint16_t port) {
 	qlBonjourActive.removeAll(record);
 	foreach (ServerItem *si, qlItems) {
 		if (si->zeroconfRecord == record) {
@@ -1393,7 +1391,7 @@ void ConnectDialog::onUpdateLanList(const QList< BonjourRecord > &list) {
 		if (!found) {
 			ServerItem *si = new ServerItem(record);
 			qlItems << si;
-			g.zeroconf->bsrResolver->resolveBonjourRecord(record);
+			g.zeroconf->startResolver(record);
 			startDns(si);
 			qtwServers->siLAN->addServerItem(si);
 		}
@@ -1406,13 +1404,8 @@ void ConnectDialog::onUpdateLanList(const QList< BonjourRecord > &list) {
 	}
 }
 
-void ConnectDialog::onLanBrowseError(DNSServiceErrorType err) {
-	qWarning() << "Bonjour reported browser error " << err;
-}
-
-void ConnectDialog::onLanResolveError(BonjourRecord br, DNSServiceErrorType err) {
-	qlBonjourActive.removeAll(br);
-	qWarning() << "Bonjour reported resolver error " << err;
+void ConnectDialog::onLanResolveError(const BonjourRecord record) {
+	qlBonjourActive.removeAll(record);
 }
 #endif
 
@@ -1627,17 +1620,15 @@ void ConnectDialog::startDns(ServerItem *si) {
 		foreach (const ServerAddress &addr, si->qlAddresses) { qhPings[addr].insert(si); }
 		return;
 	}
-
 #ifdef USE_ZEROCONF
 	if (bAllowZeroconf && si->qsHostname.isEmpty() && !si->zeroconfRecord.serviceName.isEmpty()) {
 		if (!qlBonjourActive.contains(si->zeroconfRecord)) {
-			g.zeroconf->bsrResolver->resolveBonjourRecord(si->zeroconfRecord);
+			g.zeroconf->startResolver(si->zeroconfRecord);
 			qlBonjourActive.append(si->zeroconfRecord);
 		}
 		return;
 	}
 #endif
-
 	if (!qhDNSWait.contains(unresolved)) {
 		if (si->itType == ServerItem::PublicType)
 			qlDNSLookup.append(unresolved);

src/mumble/ConnectDialog.h

@@ -358,10 +358,9 @@ public slots:
 	QList< BonjourRecord > qlBonjourActive;
 public slots:
 	void onUpdateLanList(const QList< BonjourRecord > &);
-	void onLanBrowseError(DNSServiceErrorType);
 
-	void onResolved(BonjourRecord, QString, int);
-	void onLanResolveError(BonjourRecord, DNSServiceErrorType);
+	void onResolved(const BonjourRecord, const QString, const uint16_t);
+	void onLanResolveError(const BonjourRecord);
 #endif
 private slots:
 	void on_qleSearchServername_textChanged(const QString &searchServername);