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Agent/README.md

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+# Agent
+
+只是一个普通的Java agent，使用方法为 `java -jar Agent.jar [pid] [jarFile]`
+
+当以 systemctl start 方式启动 jar ，且目标开启了 `PrivateTemp` 的时候，其 **.java_pid{pid}** 文件不在 `/tmp` 目录下，而是在 `/tmp/system-xxx-yyy.service-zzz/tmp` 下，导致 agent 无法找到 socks 通信，也就无法 attach 到目标上。
+基于此，将 `sun.tool.attach.LinuxVirtualMachine` 重写为 MyLVM 类，需要利用时：
+1. 将 sun.tools.attach.MyLVM 中的 `public static String tmpdir = "/tmp/";` 更改为目标 `.java_pid{pid}` 所在的=目录
+2. 修改 `AgentMain.java` ， 使用 `UseMyLVM(id, jarName)` 函数，注释掉另一个
+```java
+        UseMyLVM(id, jarName);
+//        UseNativeVM(id, jarName);
+```
+3. 编译，注入
+
+## 参考文章
+attach 相关原理可以看：
+1. [源码解析 java attach](https://www.cnblogs.com/Jack-Blog/p/15026267.html)
+2. [JVM源码分析之Attach机制实现完全解读](https://mp.weixin.qq.com/s?__biz=MzIzNjI1ODc2OA==&mid=2650886799&idx=1&sn=108c5fdfcd2695594d4f80ff02fc9a70&mpshare=1&scene=21&srcid=0114WsKpUmDXhRtqy8x7JX5w#wechat_redirect)
+3. [Systemd Unit文件中PrivateTmp字段详解-Jason.Zhi](https://www.cnblogs.com/lihuobao/p/5624071.html)

Agent/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>shiroAgent</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.earcam.wrapped</groupId>
+            <artifactId>com.sun.tools.attach</artifactId>
+            <version>1.8.0_jdk8u172-b11</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/org.javassist/javassist -->
+<!--        <dependency>-->
+<!--            <groupId>com.sun</groupId>-->
+<!--            <artifactId>tools</artifactId>-->
+<!--            <version>1.8.0</version>-->
+<!--            <scope>system</scope>-->
+<!--            <systemPath>/Library/Java/JavaVirtualMachines/jdk1.8.0_351.jdk/Contents/Home/lib/tools.jar</systemPath>-->
+<!--        </dependency>-->
+
+    </dependencies>
+
+
+
+</project>

Agent/src/main/java/AgentMain.java

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+import com.sun.tools.attach.AttachNotSupportedException;
+import com.sun.tools.attach.VirtualMachine;
+import com.sun.tools.attach.spi.AttachProvider;
+import sun.tools.attach.MyLVM;
+
+import java.util.List;
+
+public class AgentMain {
+    public static void main(String[] args) throws Exception {
+        String id = args[0];
+        String jarName = args[1];
+
+        System.out.println("id ==> " + id);
+        System.out.println("name ==> " + jarName);
+
+//        UseMyLVM(id, jarName);
+        UseNativeVM(id, jarName);
+    }
+
+    public static void UseMyLVM(String id, String jarName) throws Exception {
+        List<AttachProvider> providers = AttachProvider.providers();
+        for (AttachProvider provider: providers) {
+            try {
+                System.out.println(provider.name());
+                VirtualMachine virtualMachine = MyLVM.NewMyLVM(provider, id);
+                System.out.println("attach!");
+                virtualMachine.loadAgent(jarName);
+                virtualMachine.detach();
+
+                System.out.println("ends");
+                return ;
+            } catch (AttachNotSupportedException x) {
+                x.printStackTrace();
+            }
+        }
+    }
+
+    public static void UseNativeVM(String id, String jarName) throws Exception {
+        try {
+            VirtualMachine virtualMachine = VirtualMachine.attach(id);
+            System.out.println("attach!");
+            virtualMachine.loadAgent(jarName);
+            virtualMachine.detach();
+
+            System.out.println("ends");
+        } catch (AttachNotSupportedException x) {
+            x.printStackTrace();
+        }
+    }
+}