1 /*
2  * Copyright (C) 2024 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import ghidra.app.script.GhidraScript;
18 import ghidra.program.model.listing.Function;
19 import ghidra.program.model.listing.FunctionIterator;
20 
21 import java.io.ObjectOutputStream;
22 import java.math.BigInteger;
23 import java.net.Socket;
24 import java.util.ArrayList;
25 import java.util.Arrays;
26 import java.util.List;
27 
28 public class FunctionOffsetPostScript extends GhidraScript {
29 
run()30     public void run() throws Exception {
31         String spaceSeparatedFunctionNames = propertiesFileParams.getValue("functionNames");
32         List<String> listOfFunctions = Arrays.asList(spaceSeparatedFunctionNames.split("\\s+"));
33         List<BigInteger> output = new ArrayList<>();
34 
35         // Find the function offsets
36         for (String function : listOfFunctions) {
37             FunctionIterator functionIterator = currentProgram.getListing().getFunctions(true);
38             BigInteger offset = null;
39             while (functionIterator.hasNext()) {
40                 Function nextFunction = functionIterator.next();
41                 if (!nextFunction.getName().equals(function)) {
42                     continue; // Skip to the next iteration if the function name doesn't match
43                 }
44 
45                 // If the function name matches, calculate the offset
46                 offset =
47                         nextFunction
48                                 .getEntryPoint()
49                                 .subtract(currentProgram.getImageBase().getOffset())
50                                 .getOffsetAsBigInteger();
51                 break;
52             }
53 
54             // 'output' is appended in the same order as 'listOfFunctions' contains the function
55             // names. If an offset is not found, null is appended.
56             output.add(offset);
57         }
58         try (Socket socket =
59                         new Socket(
60                                 "localhost",
61                                 Integer.parseInt(propertiesFileParams.getValue("port")));
62                 ObjectOutputStream outputStream =
63                         new ObjectOutputStream(socket.getOutputStream()); ) {
64             outputStream.writeObject(output);
65         }
66     }
67 }
68