diff options
author | Christian Schneppe <christian@pix-art.de> | 2017-09-24 21:37:01 +0200 |
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committer | Christian Schneppe <christian@pix-art.de> | 2017-09-24 21:37:01 +0200 |
commit | 92752d5e54902682777b0cb15fb0c480e5796ba2 (patch) | |
tree | ad4a638a4a45889babbff9df57fd34a3c9bcab83 /src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java | |
parent | 0bf2d7f2d5d6f7f45c3db14f1aebae5a5153a9bf (diff) |
give exec resolver a lower priority over reflection
Diffstat (limited to 'src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java')
-rw-r--r-- | src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java b/src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java new file mode 100644 index 000000000..6097fcd03 --- /dev/null +++ b/src/main/java/de/pixart/messenger/utils/AndroidUsingExecLowPriority.java @@ -0,0 +1,92 @@ +/* + * Copyright 2015-2016 the original author or authors + * + * This software is licensed under the Apache License, Version 2.0, + * the GNU Lesser General Public License version 2 or later ("LGPL") + * and the WTFPL. + * You may choose either license to govern your use of this software only + * upon the condition that you accept all of the terms of either + * the Apache License 2.0, the LGPL 2.1+ or the WTFPL. + */ + +package de.pixart.messenger.utils; + +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.LineNumberReader; +import java.net.InetAddress; +import java.util.HashSet; +import java.util.logging.Level; + +import de.measite.minidns.dnsserverlookup.AbstractDNSServerLookupMechanism; +import de.measite.minidns.dnsserverlookup.AndroidUsingReflection; +import de.measite.minidns.dnsserverlookup.DNSServerLookupMechanism; +import de.measite.minidns.util.PlatformDetection; + +/** + * Try to retrieve the list of DNS server by executing getprop. + */ +public class AndroidUsingExecLowPriority extends AbstractDNSServerLookupMechanism { + + public static final DNSServerLookupMechanism INSTANCE = new AndroidUsingExecLowPriority(); + public static final int PRIORITY = AndroidUsingReflection.PRIORITY + 1; + + private AndroidUsingExecLowPriority() { + super(AndroidUsingExecLowPriority.class.getSimpleName(), PRIORITY); + } + + @Override + public String[] getDnsServerAddresses() { + try { + Process process = Runtime.getRuntime().exec("getprop"); + InputStream inputStream = process.getInputStream(); + LineNumberReader lnr = new LineNumberReader( + new InputStreamReader(inputStream)); + String line; + HashSet<String> server = new HashSet<>(6); + while ((line = lnr.readLine()) != null) { + int split = line.indexOf("]: ["); + if (split == -1) { + continue; + } + String property = line.substring(1, split); + String value = line.substring(split + 4, line.length() - 1); + + if (value.isEmpty()) { + continue; + } + + if (property.endsWith(".dns") || property.endsWith(".dns1") || + property.endsWith(".dns2") || property.endsWith(".dns3") || + property.endsWith(".dns4")) { + + // normalize the address + + InetAddress ip = InetAddress.getByName(value); + + if (ip == null) continue; + + value = ip.getHostAddress(); + + if (value == null) continue; + if (value.length() == 0) continue; + + server.add(value); + } + } + if (server.size() > 0) { + return server.toArray(new String[server.size()]); + } + } catch (IOException e) { + LOGGER.log(Level.WARNING, "Exception in findDNSByExec", e); + } + return null; + } + + @Override + public boolean isAvailable() { + return PlatformDetection.isAndroid(); + } + +}
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