/**
* Returns a string containing details of this network interface. The exact format is deliberately
* unspecified. Callers that require a specific format should build a string themselves, using
* this class' accessor methods.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder(25);
sb.append("[");
sb.append(name);
sb.append("][");
sb.append(interfaceIndex);
sb.append("]");
for (InetAddress address : addresses) {
sb.append("[");
sb.append(address.toString());
sb.append("]");
}
return sb.toString();
}
private static void collectIpv4Address(
String interfaceName, List<InetAddress> addresses, List<InterfaceAddress> interfaceAddresses)
throws SocketException {
FileDescriptor fd = null;
try {
fd = Libcore.os.socket(AF_INET, SOCK_DGRAM, 0);
InetAddress address = Libcore.os.ioctlInetAddress(fd, SIOCGIFADDR, interfaceName);
InetAddress broadcast = Inet4Address.ANY;
try {
broadcast = Libcore.os.ioctlInetAddress(fd, SIOCGIFBRDADDR, interfaceName);
} catch (ErrnoException e) {
if (e.errno != EINVAL) {
throw e;
}
}
InetAddress netmask = Libcore.os.ioctlInetAddress(fd, SIOCGIFNETMASK, interfaceName);
if (broadcast.equals(Inet4Address.ANY)) {
broadcast = null;
}
addresses.add(address);
interfaceAddresses.add(
new InterfaceAddress(
(Inet4Address) address, (Inet4Address) broadcast, (Inet4Address) netmask));
} catch (ErrnoException errnoException) {
if (errnoException.errno != EADDRNOTAVAIL && errnoException.errno != EOPNOTSUPP) {
// EADDRNOTAVAIL just means no IPv4 address for this interface.
// EOPNOTSUPP means the interface doesn't have an address, such as the lo interface.
// Anything else is a real error.
throw rethrowAsSocketException(errnoException);
}
} catch (Exception ex) {
throw rethrowAsSocketException(ex);
} finally {
IoUtils.closeQuietly(fd);
}
}