From f9c07da7b6c167820a71d2c840b7be70c393457a Mon Sep 17 00:00:00 2001 From: Thiago Macieira Date: Tue, 12 Dec 2017 13:55:32 -0800 Subject: Examples: Update multicast sender and receiver examples for IPv6 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It's the right thing to do, as we're in 2017, not 1997. Also, this takes care to indicate that QAbstractSocket::MulticastTtlOption makes sense mostly for IPv4, even though it's implemented for both families. In IPv4, it's used to indicatae the scope, whereas in IPv6 it's stored in bits 12-15 of the address. Task-number: QTBUG-46046 Change-Id: I9741f017961b410c910dfffd14ffaabe0a2024d8 Reviewed-by: Mårten Nordheim Reviewed-by: Timur Pocheptsov --- examples/network/multicastsender/sender.cpp | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'examples/network/multicastsender/sender.cpp') diff --git a/examples/network/multicastsender/sender.cpp b/examples/network/multicastsender/sender.cpp index cb4bf45672..a542a2528f 100644 --- a/examples/network/multicastsender/sender.cpp +++ b/examples/network/multicastsender/sender.cpp @@ -52,11 +52,21 @@ Sender::Sender(QWidget *parent) : QDialog(parent), - groupAddress(QStringLiteral("239.255.43.21")) + groupAddress4(QStringLiteral("239.255.43.21")), + groupAddress6(QStringLiteral("ff12::2115")) { - statusLabel = new QLabel(tr("Ready to multicast datagrams to group %1 on port 45454").arg(groupAddress.toString())); + // force binding to their respective families + udpSocket4.bind(QHostAddress(QHostAddress::AnyIPv4), 0); + udpSocket6.bind(QHostAddress(QHostAddress::AnyIPv6), udpSocket4.localPort()); - auto ttlLabel = new QLabel(tr("TTL for multicast datagrams:")); + QString msg = tr("Ready to multicast datagrams to groups %1 and [%2] on port 45454").arg(groupAddress4.toString()); + if (udpSocket6.state() != QAbstractSocket::BoundState) + msg = tr("IPv6 failed. Ready to multicast datagrams to group %1 on port 45454").arg(groupAddress4.toString()); + else + msg = msg.arg(groupAddress6.toString()); + statusLabel = new QLabel(msg); + + auto ttlLabel = new QLabel(tr("TTL for IPv4 multicast datagrams:")); auto ttlSpinBox = new QSpinBox; ttlSpinBox->setRange(0, 255); @@ -88,7 +98,8 @@ Sender::Sender(QWidget *parent) void Sender::ttlChanged(int newTtl) { - udpSocket.setSocketOption(QAbstractSocket::MulticastTtlOption, newTtl); + // we only set the TTL on the IPv4 socket, as that changes the multicast scope + udpSocket4.setSocketOption(QAbstractSocket::MulticastTtlOption, newTtl); } void Sender::startSending() @@ -101,6 +112,8 @@ void Sender::sendDatagram() { statusLabel->setText(tr("Now sending datagram %1").arg(messageNo)); QByteArray datagram = "Multicast message " + QByteArray::number(messageNo); - udpSocket.writeDatagram(datagram, groupAddress, 45454); + udpSocket4.writeDatagram(datagram, groupAddress4, 45454); + if (udpSocket6.state() == QAbstractSocket::BoundState) + udpSocket6.writeDatagram(datagram, groupAddress6, 45454); ++messageNo; } -- cgit v1.2.3