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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.net.module.util.netlink;
import static android.system.OsConstants.NETLINK_ROUTE;
import static com.android.net.module.util.NetworkStackConstants.ETHER_MTU;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import android.net.MacAddress;
import android.system.OsConstants;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.net.module.util.HexDump;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class RtNetlinkLinkMessageTest {
// An example of the full RTM_NEWLINK message.
private static final String RTM_NEWLINK_HEX =
"64000000100000000000000000000000" // struct nlmsghr
+ "000001001E0000000210000000000000" // struct ifinfo
+ "0A000300776C616E30000000" // IFLA_IFNAME(wlan0)
+ "08000D00B80B0000" // IFLA_PROTINFO
+ "0500100002000000" // IFLA_OPERSTATE
+ "0500110001000000" // IFLA_LINKMODE
+ "08000400DC050000" // IFLA_MTU
+ "0A00010092C3E3C9374E0000" // IFLA_ADDRESS
+ "0A000200FFFFFFFFFFFF0000"; // IFLA_BROADCAST
private ByteBuffer toByteBuffer(final String hexString) {
return ByteBuffer.wrap(HexDump.hexStringToByteArray(hexString));
}
@Test
public void testParseRtmNewLink() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWLINK_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkLinkMessage);
final RtNetlinkLinkMessage linkMsg = (RtNetlinkLinkMessage) msg;
final StructNlMsgHdr hdr = linkMsg.getHeader();
assertNotNull(hdr);
assertEquals(100, hdr.nlmsg_len);
assertEquals(NetlinkConstants.RTM_NEWLINK, hdr.nlmsg_type);
assertEquals(0, hdr.nlmsg_flags);
assertEquals(0, hdr.nlmsg_seq);
assertEquals(0, hdr.nlmsg_pid);
final StructIfinfoMsg ifinfomsgHdr = linkMsg.getIfinfoHeader();
assertNotNull(ifinfomsgHdr);
assertEquals((byte) OsConstants.AF_UNSPEC, ifinfomsgHdr.family);
assertEquals(OsConstants.ARPHRD_ETHER, ifinfomsgHdr.type);
assertEquals(30, ifinfomsgHdr.index);
assertEquals(0, ifinfomsgHdr.change);
assertEquals(ETHER_MTU, linkMsg.getMtu());
assertEquals(MacAddress.fromString("92:C3:E3:C9:37:4E"), linkMsg.getHardwareAddress());
assertTrue(linkMsg.getInterfaceName().equals("wlan0"));
}
/**
* Example:
* # adb shell ip tunnel add トン0 mode sit local any remote 8.8.8.8
* # adb shell ip link show | grep トン
* 33: トン0@NONE: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group
* default qlen 1000
*
* IFLA_IFNAME attribute: \x0c\x00\x03\x00\xe3\x83\x88\xe3\x83\xb3\x30\x00
* length: 0x000c
* type: 0x0003
* value: \xe3\x83\x88\xe3\x83\xb3\x30\x00
* ト (\xe3\x83\x88)
* ン (\xe3\x83\xb3)
* 0 (\x30)
* null terminated (\x00)
*/
private static final String RTM_NEWLINK_UTF8_HEX =
"34000000100000000000000000000000" // struct nlmsghr
+ "000001001E0000000210000000000000" // struct ifinfo
+ "08000400DC050000" // IFLA_MTU
+ "0A00010092C3E3C9374E0000" // IFLA_ADDRESS
+ "0C000300E38388E383B33000"; // IFLA_IFNAME(トン0)
@Test
public void testParseRtmNewLink_utf8Ifname() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWLINK_UTF8_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkLinkMessage);
final RtNetlinkLinkMessage linkMsg = (RtNetlinkLinkMessage) msg;
assertTrue(linkMsg.getInterfaceName().equals("トン0"));
}
private static final String RTM_NEWLINK_PACK_HEX =
"34000000100000000000000000000000" // struct nlmsghr
+ "000001001E0000000210000000000000" // struct ifinfo
+ "08000400DC050000" // IFLA_MTU
+ "0A00010092C3E3C9374E0000" // IFLA_ADDRESS
+ "0A000300776C616E30000000"; // IFLA_IFNAME(wlan0)
@Test
public void testPackRtmNewLink() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWLINK_PACK_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkLinkMessage);
final RtNetlinkLinkMessage linkMsg = (RtNetlinkLinkMessage) msg;
final ByteBuffer packBuffer = ByteBuffer.allocate(64);
packBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
linkMsg.pack(packBuffer);
assertEquals(RTM_NEWLINK_PACK_HEX, HexDump.toHexString(packBuffer.array()));
}
private static final String RTM_NEWLINK_TRUNCATED_HEX =
"54000000100000000000000000000000" // struct nlmsghr
+ "000001001E0000000210000000000000" // struct ifinfo
+ "08000D00B80B0000" // IFLA_PROTINFO
+ "0500100002000000" // IFLA_OPERSTATE
+ "0800010092C3E3C9" // IFLA_ADDRESS(truncated)
+ "0500110001000000" // IFLA_LINKMODE
+ "0A000300776C616E30000000" // IFLA_IFNAME(wlan0)
+ "08000400DC050000"; // IFLA_MTU
@Test
public void testTruncatedRtmNewLink() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWLINK_TRUNCATED_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkLinkMessage);
final RtNetlinkLinkMessage linkMsg = (RtNetlinkLinkMessage) msg;
// Truncated IFLA_ADDRESS attribute doesn't affect parsing other attrs.
assertNull(linkMsg.getHardwareAddress());
assertEquals(ETHER_MTU, linkMsg.getMtu());
assertTrue(linkMsg.getInterfaceName().equals("wlan0"));
}
@Test
public void testToString() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWLINK_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkLinkMessage);
final RtNetlinkLinkMessage linkMsg = (RtNetlinkLinkMessage) msg;
final String expected = "RtNetlinkLinkMessage{ "
+ "nlmsghdr{"
+ "StructNlMsgHdr{ nlmsg_len{100}, nlmsg_type{16(RTM_NEWLINK)}, nlmsg_flags{0()}, "
+ "nlmsg_seq{0}, nlmsg_pid{0} }}, "
+ "Ifinfomsg{"
+ "family: 0, type: 1, index: 30, flags: 4098, change: 0}, "
+ "Hardware Address{92:c3:e3:c9:37:4e}, " + "MTU{1500}, "
+ "Ifname{wlan0} "
+ "}";
assertEquals(expected, linkMsg.toString());
}
}
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