Initial commit

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

LICENSE

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+MIT License
+
+Copyright (c) 2019 KasuganoSoras
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Anti-CatServer

manifest.mf

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+Manifest-Version: 1.0
+Premain-Class: org.natfrp.Anti.CatServer.Loader

src/org/natfrp/Anti/CatServer/Http.java

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+package org.natfrp.Anti.CatServer;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.URLEncoder;
+
+public class Http {
+
+    private static String rstr;
+
+    public static String GET(String WebURL, String WebRequest) throws IOException {
+        String getURL = WebURL + URLEncoder.encode(WebRequest, "utf-8");
+        URL getUrl = new URL(getURL);
+        HttpURLConnection connection = (HttpURLConnection) getUrl.openConnection();
+        connection.connect();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+        String line;
+        while ((line = reader.readLine()) != null) {
+            return line;
+        }
+        reader.close();
+        connection.disconnect();
+        return null;
+    }
+
+    public static String Request(String URL, String Request) {
+        try {
+            return GET(URL, Request);
+        } catch (IOException ex) {
+            System.err.println(ex.getMessage());
+        }
+        return null;
+    }
+
+}

src/org/natfrp/Anti/CatServer/Loader.java

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+package org.natfrp.Anti.CatServer;
+
+import java.lang.instrument.Instrumentation;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Timer;
+import java.util.TimerTask;
+
+
+public class Loader {
+
+    static class TimerTaskImpl extends TimerTask {
+
+        private static final String mainClass = "catserver.server.CatServer";
+
+        @Override
+        public void run() {
+            try {
+                // 检测到 CatServer 主类存在
+                if (Class.forName(mainClass) != null) {
+                    throw new SecurityException();
+                }
+            } catch (ClassNotFoundException ignored) {
+                // 服务端非 CatServer 或暂时未载入
+            } catch (SecurityException se) {
+                System.out.println("======================= [ Anti CatServer ] =======================");
+                System.out.println("CatServer 服务端已被管理员禁止使用，请更换其他服务端后再尝试启动服务器。");
+                System.out.println("因为该服务端存在后门，出于保护您和其他用户数据的安全，我们禁止使用此服务端。");
+                System.out.println("如果您多次尝试加载该服务端，或者尝试绕过我们的检测，您的服务器将会被停机。");
+                System.out.println("==================================================================");
+                System.exit(-1);
+                throw se;
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
+        }
+
+    }
+
+    private static final Map<String, Runnable> solutions = new HashMap<>();
+
+    static {
+        solutions.put("hardcore", () -> new Timer(true).schedule(new TimerTaskImpl(), 0, 1000));
+    }
+
+    public static void premain(String agentOps, Instrumentation inst) {
+        agentOps = agentOps != null ? (agentOps.isEmpty() ? "hardcore" : agentOps) : "hardcore";
+        Runnable solution = solutions.get(agentOps);
+        if (solution != null) {
+            try {
+                solution.run();
+            } catch (Exception e) {
+                e.printStackTrace();
+                System.exit(-1);
+                throw e;
+            }
+        } else {
+            throw new IllegalArgumentException(agentOps);
+        }
+    }
+
+}

src/org/natfrp/Anti/CatServer/RunCommand.java

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+package org.natfrp.Anti.CatServer;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
+public class RunCommand {
+
+    public static String exec(String cmd) throws Exception {
+        Process pcs = Runtime.getRuntime().exec(cmd);
+        String result = null;
+        BufferedInputStream in = new BufferedInputStream(pcs.getInputStream());
+        BufferedReader br = new BufferedReader(new InputStreamReader(in));
+        String lineStr;
+        while ((lineStr = br.readLine()) != null) {
+            result = lineStr;
+        }
+        br.close();
+        in.close();
+        return result;
+    }
+
+}