78 lines
2.3 KiB
Java
78 lines
2.3 KiB
Java
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package io.zhile.research.ja.netfilter;
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import java.lang.instrument.Instrumentation;
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import java.lang.instrument.UnmodifiableClassException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.jar.JarFile;
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public class Launcher {
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public static void main(String[] args) {
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printUsage();
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}
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public static void premain(String args, Instrumentation inst) {
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printUsage();
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URL jarURL = getJarURL();
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if (null == jarURL) {
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throw new RuntimeException("Can not locate ja-netfilter jar file.");
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}
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try {
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inst.appendToBootstrapClassLoaderSearch(new JarFile(jarURL.getPath()));
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} catch (Throwable e) {
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throw new RuntimeException("Can not access ja-netfilter jar file.", e);
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}
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for (Class<?> c : inst.getAllLoadedClasses()) {
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try {
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inst.retransformClasses(c);
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} catch (UnmodifiableClassException e) {
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// ok, ok. just ignore
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}
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}
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inst.addTransformer(new TransformDispatcher(), true);
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}
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private static void printUsage() {
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String content = "\n ============================================================================ \n" +
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"\n" +
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" A javaagent lib for network filter :)\n" +
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"\n" +
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" https://github.com/pengzhile/ja-netfilter\n" +
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"\n" +
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" ============================================================================ \n\n";
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System.out.print(content);
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System.out.flush();
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}
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private static URL getJarURL() {
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URL url = Launcher.class.getProtectionDomain().getCodeSource().getLocation();
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if (null != url) {
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return url;
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}
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String resourcePath = "/442fcf28466515a81d5434931496ffa64611cc8e.txt";
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url = Launcher.class.getResource(resourcePath);
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if (null == url) {
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return null;
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}
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String path = url.getPath();
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if (!path.endsWith("!" + resourcePath)) {
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return null;
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}
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path = path.substring(0, path.length() - resourcePath.length() - 1);
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try {
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return new URL(path);
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} catch (MalformedURLException e) {
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return null;
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}
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}
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}
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