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23 
24 /* @test
25  * @bug 8134577
26  * @summary Test the internal NameService implementation which is enabled via
27  *          the system property jdk.net.hosts.file. This property specifies
28  *          a file name that contains address host mappings, similar to those in
29  *          /etc/hosts file. TestHosts-III file  exist, with a set of ipv4 and ipv6
30  *          mappings
31  * @run main/othervm -Djdk.net.hosts.file=${test.src}/TestHosts-III -Dsun.net.inetaddr.ttl=0
32  *      InternalNameServiceWithHostsFileTest
33  */
34 
35 import java.net.InetAddress;
36 import java.net.UnknownHostException;
37 import java.util.Arrays;
38 
39 public class InternalNameServiceWithHostsFileTest {
main(String args[])40     public static void main(String args[]) throws Exception {
41         // fe80::1
42         byte[] expectedIpv6Address = { (byte) 0xfe, (byte) 0x80, 0, 0, 0, 0, 0,
43                 0, 0, 0, 0, 0, 0, 0, 0, 1 };
44         // fe00::0
45         byte[] expectedIpv6LocalAddress = { (byte) 0xfe, (byte) 0x00, 0, 0, 0,
46                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
47         // 10.2.3.4
48         byte[] expectedIpv4Address = { 10, 2, 3, 4 };
49         //
50         byte[] expectedIpv6LocalhostAddress = { 0, 0, 0, 0, 0, 0, 0,
51                 0, 0, 0, 0, 0, 0, 0, 0, 1 };
52 
53         // 10.2.3.4  testHost.testDomain
54         testHostsMapping(expectedIpv4Address, "testHost.testDomain");
55         // ::1     ip6-localhost ip6-loopback
56         testHostsMapping(expectedIpv6LocalhostAddress, "ip6-localhost");
57         // fe00::0 ip6-localnet
58         testHostsMapping(expectedIpv6LocalAddress, "ip6-localnet");
59         // fe80::1 link-local-host
60         testHostsMapping(expectedIpv6Address, "link-local-host");
61 
62         testReverseLookup("10.2.3.4", "testHost.testDomain");
63 
64         testReverseLookup("::1", "ip6-localhost");
65         testReverseLookup("0:0:0:0:0:0:0:1", "ip6-localhost");
66         testReverseLookup("0000:0000:0000:0000:0000:0000:0000:0001", "ip6-localhost");
67 
68         testReverseLookup("fe00::0", "ip6-localnet");
69         testReverseLookup("fe00:0:0:0:0:0:0:0", "ip6-localnet");
70         testReverseLookup("fe00:0000:0000:0000:0000:0000:0000:0000", "ip6-localnet");
71 
72         testReverseLookup("fe80::1", "link-local-host");
73         testReverseLookup("fe80:000:0:00:0:000:00:1", "link-local-host");
74         testReverseLookup("fe80:0000:0000:0000:0000:0000:0000:0001", "link-local-host");
75     }
76 
testHostsMapping(byte[] expectedIpAddress, String hostName)77     private static void testHostsMapping(byte[] expectedIpAddress, String hostName)
78             throws UnknownHostException {
79         InetAddress testAddress;
80         byte[] rawIpAddress;
81         testAddress = InetAddress.getByName(hostName);
82         System.out
83                 .println("############################  InetAddress == "
84                         + testAddress);
85 
86         rawIpAddress = testAddress.getAddress();
87         if (!Arrays.equals(rawIpAddress, expectedIpAddress)) {
88             System.out.println("retrieved address == "
89                     + Arrays.toString(rawIpAddress)
90                     + " not equal to expected address == "
91                     + Arrays.toString(expectedIpAddress));
92             throw new RuntimeException(
93                     "retrieved address not equal to expected address");
94         }
95         System.out.println("retrieved address == "
96                 + Arrays.toString(rawIpAddress)
97                 + " equal to expected address == "
98                 + Arrays.toString(expectedIpAddress));
99     }
100 
testReverseLookup(String numericHost, String expectedName)101     private static void testReverseLookup(String numericHost, String expectedName)
102             throws UnknownHostException {
103         String lookupResult = InetAddress.getByName(numericHost).getHostName();
104         if (!expectedName.equals(lookupResult)) {
105             throw new RuntimeException(
106                 String.format(
107                     "reverse lookup of \"%s\" is \"%s\", should be \"%s\"\n",
108                     numericHost, lookupResult, expectedName));
109         }
110     }
111 }
112