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// SPDX-License-Identifier: BSD-3-Clause
package org.xbill.DNS;
import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.xbill.DNS.config.PropertyResolverConfigProvider.DNS_NDOTS_PROP;
import static org.xbill.DNS.config.PropertyResolverConfigProvider.DNS_SEARCH_PROP;
import static org.xbill.DNS.config.PropertyResolverConfigProvider.DNS_SERVER_PROP;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.net.InetSocketAddress;
import java.util.Arrays;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.condition.DisabledOnOs;
import org.junit.jupiter.api.condition.EnabledOnOs;
import org.junit.jupiter.api.condition.OS;
import org.xbill.DNS.config.InitializationException;
import org.xbill.DNS.config.JndiContextResolverConfigProvider;
import org.xbill.DNS.config.PropertyResolverConfigProvider;
import org.xbill.DNS.config.ResolvConfResolverConfigProvider;
import org.xbill.DNS.config.SunJvmResolverConfigProvider;
import org.xbill.DNS.config.WindowsResolverConfigProvider;
class ResolverConfigTest {
@AfterEach
void afterEach() throws Exception {
// make sure the ResolverConfig providers are not staying initialized after a test
Field configProvidersField = ResolverConfig.class.getDeclaredField("configProviders");
configProvidersField.setAccessible(true);
configProvidersField.set(null, null);
Field currentConfigField = ResolverConfig.class.getDeclaredField("currentConfig");
currentConfigField.setAccessible(true);
currentConfigField.set(null, null);
}
@Test
void testSkipInit() {
try {
System.setProperty(ResolverConfig.CONFIGPROVIDER_SKIP_INIT, Boolean.TRUE.toString());
assertTrue(ResolverConfig.getConfigProviders().isEmpty());
} finally {
System.setProperty(ResolverConfig.CONFIGPROVIDER_SKIP_INIT, Boolean.FALSE.toString());
}
}
@Test
void properties() {
String[] dnsServers1 = {"192.168.1.1", "192.168.1.2", "192.168.1.1"};
String[] dnsServers2 = {"192.168.1.3"};
// intentionally adding duplicate search entries for testing
String[] dnsSearch = {"dnsjava.org", "example.com", "dnsjava.org"};
Name[] searchPath =
Arrays.stream(dnsSearch).map(s -> Name.fromConstantString(s + ".")).toArray(Name[]::new);
System.setProperty(DNS_SERVER_PROP, String.join(",", dnsServers1));
System.setProperty(DNS_SEARCH_PROP, String.join(",", dnsSearch));
System.setProperty(DNS_NDOTS_PROP, String.valueOf(5));
try {
PropertyResolverConfigProvider rc = new PropertyResolverConfigProvider();
assertTrue(rc.isEnabled());
rc.initialize();
assertEquals(2, rc.servers().size());
assertEquals(dnsServers1[0], rc.servers().get(0).getAddress().getHostAddress());
// must remove no longer present servers
System.setProperty(DNS_SERVER_PROP, String.join(",", dnsServers2));
rc.initialize();
assertEquals(1, rc.servers().size());
// any duplicate suffixes should be excluded
assertEquals(2, rc.searchPaths().size());
assertEquals(searchPath[0], rc.searchPaths().get(0));
assertEquals(searchPath[1], rc.searchPaths().get(1));
assertEquals(5, rc.ndots());
} finally {
System.clearProperty(DNS_SERVER_PROP);
System.clearProperty(DNS_SEARCH_PROP);
System.clearProperty(DNS_NDOTS_PROP);
}
}
@Test
void propertiesWithPort() {
String[] dnsServers = {
"192.168.1.1", "192.168.1.1:54", "::1", "0:0:0:0:0:0:0:1", "[::1]:54", "[::2]"
};
System.setProperty(DNS_SERVER_PROP, String.join(",", dnsServers));
try {
PropertyResolverConfigProvider rc = new PropertyResolverConfigProvider();
rc.initialize();
assertEquals(5, rc.servers().size());
assertEquals("192.168.1.1", rc.servers().get(0).getAddress().getHostAddress());
assertEquals(SimpleResolver.DEFAULT_PORT, rc.servers().get(0).getPort());
assertEquals("192.168.1.1", rc.servers().get(1).getAddress().getHostAddress());
assertEquals(54, rc.servers().get(1).getPort());
assertEquals("0:0:0:0:0:0:0:1", rc.servers().get(2).getAddress().getHostAddress());
assertEquals(SimpleResolver.DEFAULT_PORT, rc.servers().get(2).getPort());
assertEquals("0:0:0:0:0:0:0:1", rc.servers().get(3).getAddress().getHostAddress());
assertEquals(54, rc.servers().get(3).getPort());
assertEquals("0:0:0:0:0:0:0:2", rc.servers().get(4).getAddress().getHostAddress());
assertEquals(53, rc.servers().get(4).getPort());
} finally {
System.clearProperty(DNS_SERVER_PROP);
}
}
@Test
@EnabledOnOs(OS.WINDOWS)
void resolvConfDisabledOnWindows() {
ResolvConfResolverConfigProvider rc = new ResolvConfResolverConfigProvider();
assertFalse(rc.isEnabled());
}
@Test
@DisabledOnOs(OS.WINDOWS)
void resolvConfEnabledOnUnix() {
ResolvConfResolverConfigProvider rc = new ResolvConfResolverConfigProvider();
assertTrue(rc.isEnabled());
}
@Test
@EnabledOnOs(OS.WINDOWS)
void windowsEnabledOnWindows() {
WindowsResolverConfigProvider rc = new WindowsResolverConfigProvider();
assertTrue(rc.isEnabled());
}
@Test
@DisabledOnOs(OS.WINDOWS)
void windowsDisabledOnUnix() {
WindowsResolverConfigProvider rc = new WindowsResolverConfigProvider();
assertFalse(rc.isEnabled());
}
@Test
void resolvConf() {
ResolvConfResolverConfigProvider rc =
new ResolvConfResolverConfigProvider() {
@Override
public void initialize() {
try {
try (InputStream in =
ResolverConfigTest.class.getResourceAsStream("/test_loaded_resolv.conf")) {
parseResolvConf(in);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
};
rc.initialize();
assertEquals(1, rc.servers().size());
assertEquals(new InetSocketAddress("192.168.1.1", 53), rc.servers().get(0));
assertEquals(2, rc.searchPaths().size());
assertFalse(rc.searchPaths().contains(Name.fromConstantString("domain.com.")));
assertEquals(5, rc.ndots());
}
@Test
void jndi() {
JndiContextResolverConfigProvider rc = new JndiContextResolverConfigProvider();
assertTrue(rc.isEnabled());
rc.initialize();
}
@Test
void sunJvm() throws InitializationException {
SunJvmResolverConfigProvider rc = new SunJvmResolverConfigProvider();
assertFalse(rc.isEnabled());
rc.initialize();
}
@Test
void sunJvmServersEqualsJndi() throws InitializationException {
SunJvmResolverConfigProvider sun = new SunJvmResolverConfigProvider();
sun.initialize();
JndiContextResolverConfigProvider jndi = new JndiContextResolverConfigProvider();
jndi.initialize();
assertEquals(sun.servers(), jndi.servers());
}
@Test
@EnabledOnOs(OS.WINDOWS)
void windowsServersContainedInJndi() throws InitializationException {
JndiContextResolverConfigProvider jndi = new JndiContextResolverConfigProvider();
jndi.initialize();
WindowsResolverConfigProvider win = new WindowsResolverConfigProvider();
win.initialize();
// The servers returned via Windows API must be in the JNDI list, but not necessarily the other
// way round. Unless there are IPv6 servers which are not in the registry and Java <= 15 does
// not find.
for (InetSocketAddress winServer : win.servers()) {
assertTrue(
jndi.servers().contains(winServer),
winServer + " not found in JNDI, " + win.servers() + "; " + jndi.servers());
}
}
@Test
void refreshAsFirstCall() {
assertDoesNotThrow(ResolverConfig::refresh);
}
}