1 files changed, 58 insertions, 0 deletions
diff --git a/src/main/java/com/code_intelligence/jazzer/agent/AgentInstaller.java b/src/main/java/com/code_intelligence/jazzer/agent/AgentInstaller.java
new file mode 100644
index 00000000..5dd041ac
--- /dev/null
+++ b/src/main/java/com/code_intelligence/jazzer/agent/AgentInstaller.java
@@ -0,0 +1,58 @@
+// Copyright 2022 Code Intelligence GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.code_intelligence.jazzer.agent;
+
+import static com.code_intelligence.jazzer.agent.AgentUtils.extractBootstrapJar;
+import static com.code_intelligence.jazzer.runtime.Constants.IS_ANDROID;
+
+import java.lang.instrument.Instrumentation;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.concurrent.atomic.AtomicBoolean;
+import net.bytebuddy.agent.ByteBuddyAgent;
+
+public class AgentInstaller {
+  private static final AtomicBoolean hasBeenInstalled = new AtomicBoolean();
+
+  /**
+   * Appends the parts of Jazzer that have to be visible to all classes, including those in the Java
+   * standard library, to the bootstrap class loader path. Additionally, if enableAgent is true,
+   * also enables the Jazzer agent that instruments classes for fuzzing.
+   */
+  public static void install(boolean enableAgent) {
+    // Only install the agent once.
+    if (!hasBeenInstalled.compareAndSet(false, true)) {
+      return;
+    }
+
+    if (IS_ANDROID) {
+      return;
+    }
+
+    Instrumentation instrumentation = ByteBuddyAgent.install();
+    instrumentation.appendToBootstrapClassLoaderSearch(extractBootstrapJar());
+    if (!enableAgent) {
+      return;
+    }
+    try {
+      Class<?> agent = Class.forName("com.code_intelligence.jazzer.agent.Agent");
+      Method install = agent.getMethod("install", Instrumentation.class);
+      install.invoke(null, instrumentation);
+    } catch (ClassNotFoundException | InvocationTargetException | NoSuchMethodException
+        | IllegalAccessException e) {
+      throw new IllegalStateException("Failed to run Agent.install", e);
+    }
+  }
+}