Network - Add QHostAddress::isLoopback API.

The standard IPv4 loopback address is 127.0.0.1, however anything in
the 127.0.0.0/8 range is also a loopback address.

isLoopback returns true for any address that is in the IPv4 loopback
address range, or is the single IPv6 loopback address ::1

Task-number: QTBUG-22246
Change-Id: Ic39100e2e97a52db700e01b109998a1cfd4335e3
Reviewed-by: Thiago Macieira (Intel) <thiago.macieira@intel.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/auto/network/kernel/qhostaddress/tst_qhostaddress.cpp b/tests/auto/network/kernel/qhostaddress/tst_qhostaddress.cpp
index b20e07be03..7e35830791 100644
--- a/tests/auto/network/kernel/qhostaddress/tst_qhostaddress.cpp
+++ b/tests/auto/network/kernel/qhostaddress/tst_qhostaddress.cpp
@@ -82,6 +82,8 @@ private slots:
     void parseSubnet();
     void isInSubnet_data();
     void isInSubnet();
+    void isLoopback_data();
+    void isLoopback();
 };
 
 QT_BEGIN_NAMESPACE
@@ -607,5 +609,43 @@ void tst_QHostAddress::isInSubnet()
     QTEST(address.isInSubnet(prefix, prefixLength), "result");
 }
 
+void tst_QHostAddress::isLoopback_data()
+{
+    QTest::addColumn<QHostAddress>("address");
+    QTest::addColumn<bool>("result");
+
+    QTest::newRow("ipv6_loop") << QHostAddress(QHostAddress::LocalHostIPv6) << true;
+    QTest::newRow("::1") << QHostAddress("::1") << true;
+
+    QTest::newRow("ipv4_loop") << QHostAddress(QHostAddress::LocalHost) << true;
+    QTest::newRow("127.0.0.1") << QHostAddress("127.0.0.1") << true;
+    QTest::newRow("127.0.0.2") << QHostAddress("127.0.0.2") << true;
+    QTest::newRow("127.3.2.1") << QHostAddress("127.3.2.1") << true;
+
+    QTest::newRow("default") << QHostAddress() << false;
+    QTest::newRow("1.2.3.4") << QHostAddress("1.2.3.4") << false;
+    QTest::newRow("10.0.0.4") << QHostAddress("10.0.0.4") << false;
+    QTest::newRow("192.168.3.4") << QHostAddress("192.168.3.4") << false;
+
+    QTest::newRow("::") << QHostAddress("::") << false;
+    QTest::newRow("Any") << QHostAddress(QHostAddress::Any) << false;
+    QTest::newRow("AnyIPv4") << QHostAddress(QHostAddress::AnyIPv4) << false;
+    QTest::newRow("AnyIPv6") << QHostAddress(QHostAddress::AnyIPv6) << false;
+    QTest::newRow("Broadcast") << QHostAddress(QHostAddress::Broadcast) << false;
+    QTest::newRow("Null") << QHostAddress(QHostAddress::Null) << false;
+
+    QTest::newRow("::ffff:127.0.0.1") << QHostAddress("::ffff:127.0.0.1") << true;
+    QTest::newRow("::ffff:127.0.0.2") << QHostAddress("::ffff:127.0.0.2") << true;
+    QTest::newRow("::ffff:127.3.2.1") << QHostAddress("::ffff:127.3.2.1") << true;
+}
+
+void tst_QHostAddress::isLoopback()
+{
+    QFETCH(QHostAddress, address);
+    QFETCH(bool, result);
+
+    QCOMPARE(address.isLoopback(), result);
+}
+
 QTEST_MAIN(tst_QHostAddress)
 #include "tst_qhostaddress.moc"