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8223214: Inet6AddressImpl.loopbackAddress() should choose loopback address that is available

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Reviewed-by: chegar
This commit is contained in:
Arthur Eubanks 2019-05-15 09:15:59 -07:00 • committed by Arthur Eubanks
parent 8e30a733c0
commit 4b7ada1a92
1 changed files with 32 additions and 12 deletions
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44
src/java.base/share/classes/java/net/Inet6AddressImpl.java
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@ -32,9 +32,13 @@ import static java.net.InetAddress.PREFER_SYSTEM_VALUE;
* Package private implementation of InetAddressImpl for dual
* IPv4/IPv6 stack.
* <p>
* If InetAddress.preferIPv6Address is true then anyLocalAddress(),
* loopbackAddress(), and localHost() will return IPv6 addresses,
* otherwise IPv4 addresses.
* If InetAddress.preferIPv6Address is true then anyLocalAddress()
* and localHost() will return IPv6 addresses, otherwise IPv4 addresses.
*
* loopbackAddress() will return the first valid loopback address in
* [IPv6 loopback, IPv4 loopback] if InetAddress.preferIPv6Address is true,
* else [IPv4 loopback, IPv6 loopback].
* If neither are valid it will fallback to the first address tried.
*
* @since 1.4
*/
@ -103,15 +107,31 @@ class Inet6AddressImpl implements InetAddressImpl {
public synchronized InetAddress loopbackAddress() {
if (loopbackAddress == null) {
if (InetAddress.preferIPv6Address == PREFER_IPV6_VALUE ||
InetAddress.preferIPv6Address == PREFER_SYSTEM_VALUE) {
byte[] loopback =
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
loopbackAddress = new Inet6Address("localhost", loopback);
} else {
loopbackAddress = (new Inet4AddressImpl()).loopbackAddress();
}
boolean preferIPv6Address =
InetAddress.preferIPv6Address == PREFER_IPV6_VALUE ||
InetAddress.preferIPv6Address == PREFER_SYSTEM_VALUE;
InetAddress loopback4 = (new Inet4AddressImpl()).loopbackAddress();
InetAddress loopback6 = new Inet6Address("localhost",
new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01});
// Order the candidate addresses by preference.
InetAddress[] addresses = preferIPv6Address
? new InetAddress[] {loopback6, loopback4}
: new InetAddress[] {loopback4, loopback6};
// In case of failure, default to the preferred address.
loopbackAddress = addresses[0];
// Pick the first candidate address that actually exists.
for (InetAddress address : addresses) {
try {
if (NetworkInterface.getByInetAddress(address) == null) {
continue;
}
} catch (SocketException e) {
continue;
}
loopbackAddress = address;
break;
}
}
return loopbackAddress;
}