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/*
* Copyright (C) 2020 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 org.junit.Assert.fail;
import android.system.OsConstants;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import org.junit.Test;
import org.junit.runner.RunWith;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class StructNlMsgHdrTest {
public static final short TEST_NLMSG_LEN = 16;
public static final short TEST_NLMSG_FLAGS = StructNlMsgHdr.NLM_F_REQUEST
| StructNlMsgHdr.NLM_F_MULTI | StructNlMsgHdr.NLM_F_ACK | StructNlMsgHdr.NLM_F_ECHO;
public static final short TEST_NLMSG_SEQ = 1234;
public static final short TEST_NLMSG_PID = 5678;
// Checking the header string nlmsg_{len, ..} of the number can make sure that the checking
// number comes from the expected element.
// TODO: Verify more flags once StructNlMsgHdr can distinguish the flags which have the same
// value. For example, NLM_F_MATCH (0x200) and NLM_F_EXCL (0x200) can't be distinguished.
// See StructNlMsgHdrTest#stringForNlMsgFlags.
public static final String TEST_NLMSG_LEN_STR = "nlmsg_len{16}";
public static final String TEST_NLMSG_FLAGS_STR =
"NLM_F_REQUEST|NLM_F_MULTI|NLM_F_ACK|NLM_F_ECHO";
public static final String TEST_NLMSG_SEQ_STR = "nlmsg_seq{1234}";
public static final String TEST_NLMSG_PID_STR = "nlmsg_pid{5678}";
private StructNlMsgHdr makeStructNlMsgHdr(short type) {
final StructNlMsgHdr struct = new StructNlMsgHdr();
struct.nlmsg_len = TEST_NLMSG_LEN;
struct.nlmsg_type = type;
struct.nlmsg_flags = TEST_NLMSG_FLAGS;
struct.nlmsg_seq = TEST_NLMSG_SEQ;
struct.nlmsg_pid = TEST_NLMSG_PID;
return struct;
}
private static void assertContains(String actualValue, String expectedSubstring) {
if (actualValue.contains(expectedSubstring)) return;
fail("\"" + actualValue + "\" does not contain \"" + expectedSubstring + "\"");
}
@Test
public void testToString() {
StructNlMsgHdr struct = makeStructNlMsgHdr(NetlinkConstants.RTM_NEWADDR);
String s = struct.toString();
assertContains(s, TEST_NLMSG_LEN_STR);
assertContains(s, TEST_NLMSG_FLAGS_STR);
assertContains(s, TEST_NLMSG_SEQ_STR);
assertContains(s, TEST_NLMSG_PID_STR);
assertContains(s, "nlmsg_type{20()}");
struct = makeStructNlMsgHdr(NetlinkConstants.SOCK_DIAG_BY_FAMILY);
s = struct.toString();
assertContains(s, TEST_NLMSG_LEN_STR);
assertContains(s, TEST_NLMSG_FLAGS_STR);
assertContains(s, TEST_NLMSG_SEQ_STR);
assertContains(s, TEST_NLMSG_PID_STR);
assertContains(s, "nlmsg_type{20()}");
}
@Test
public void testToStringWithNetlinkFamily() {
StructNlMsgHdr struct = makeStructNlMsgHdr(NetlinkConstants.RTM_NEWADDR);
String s = struct.toString(OsConstants.NETLINK_ROUTE);
assertContains(s, TEST_NLMSG_LEN_STR);
assertContains(s, TEST_NLMSG_FLAGS_STR);
assertContains(s, TEST_NLMSG_SEQ_STR);
assertContains(s, TEST_NLMSG_PID_STR);
assertContains(s, "nlmsg_type{20(RTM_NEWADDR)}");
struct = makeStructNlMsgHdr(NetlinkConstants.SOCK_DIAG_BY_FAMILY);
s = struct.toString(OsConstants.NETLINK_INET_DIAG);
assertContains(s, TEST_NLMSG_LEN_STR);
assertContains(s, TEST_NLMSG_FLAGS_STR);
assertContains(s, TEST_NLMSG_SEQ_STR);
assertContains(s, TEST_NLMSG_PID_STR);
assertContains(s, "nlmsg_type{20(SOCK_DIAG_BY_FAMILY)}");
}
}
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