Add auto-discovery of Ghidra instances and JSON project info endpoint

- Modified bridge_mcp_hydra.py to auto-discover GhydraMCP plugin instances on ports 8192-8299
- Added periodic background thread to maintain discovered instances list
- Added project and binary file information to instance reporting
- Added JSON-based info endpoint in GhydraMCP plugin
- Added json-simple dependency to support JSON responses

bridge_mcp_hydra.py

@@ -7,16 +7,19 @@
 # ///
 import os
 import sys
+import time
 import requests
+import threading
 from typing import Dict
 from threading import Lock
 from mcp.server.fastmcp import FastMCP
 
-# Track active Ghidra instances (port -> url)
-active_instances: Dict[int, str] = {}
+# Track active Ghidra instances (port -> info dict)
+active_instances: Dict[int, dict] = {}
 instances_lock = Lock()
 DEFAULT_GHIDRA_PORT = 8192
 DEFAULT_GHIDRA_HOST = "localhost"
+DISCOVERY_PORT_RANGE = range(8192, 8300)  # Port range to scan for Ghidra instances
 
 mcp = FastMCP("hydra-mcp")
 
@@ -30,12 +33,13 @@ def get_instance_url(port: int) -> str:
     """Get URL for a Ghidra instance by port"""
     with instances_lock:
         if port in active_instances:
-            return active_instances[port]
+            return active_instances[port]["url"]
         
         # Auto-register if not found but port is valid
         if 8192 <= port <= 65535:
             register_instance(port)
-            return active_instances[port]
+            if port in active_instances:
+                return active_instances[port]["url"]
         
         return f"http://{ghidra_host}:{port}"
 
@@ -116,8 +120,13 @@ def list_instances() -> dict:
     with instances_lock:
         return {
             "instances": [
-                {"port": port, "url": url}
-                for port, url in active_instances.items()
+                {
+                    "port": port, 
+                    "url": info["url"],
+                    "project": info.get("project", ""),
+                    "file": info.get("file", "")
+                }
+                for port, info in active_instances.items()
             ]
         }
 
@@ -133,12 +142,41 @@ def register_instance(port: int, url: str = None) -> str:
         response = requests.get(test_url, timeout=2)
         if not response.ok:
             return f"Error: Instance at {url} is not responding properly"
-    except Exception as e:
-        return f"Error: Could not connect to instance at {url}: {str(e)}"
+        
+        # Try to get project info
+        project_info = {"url": url}
+        
+        try:
+            info_url = f"{url}/info"
+            info_response = requests.get(info_url, timeout=2)
+            if info_response.ok:
+                try:
+                    # Parse JSON response
+                    info_data = info_response.json()
+                    
+                    # Extract relevant information
+                    project_info["project"] = info_data.get("project", "Unknown")
+                    
+                    # Handle file information which is nested
+                    file_info = info_data.get("file", {})
+                    if file_info:
+                        project_info["file"] = file_info.get("name", "")
+                        project_info["path"] = file_info.get("path", "")
+                        project_info["architecture"] = file_info.get("architecture", "")
+                        project_info["endian"] = file_info.get("endian", "")
+                except ValueError:
+                    # Not valid JSON
+                    pass
+        except Exception:
+            # Non-critical, continue with registration even if project info fails
+            pass
         
         with instances_lock:
-        active_instances[port] = url
+            active_instances[port] = project_info
+            
         return f"Registered instance on port {port} at {url}"
+    except Exception as e:
+        return f"Error: Could not connect to instance at {url}: {str(e)}"
 
 @mcp.tool()
 def unregister_instance(port: int) -> str:
@@ -149,6 +187,31 @@ def unregister_instance(port: int) -> str:
             return f"Unregistered instance on port {port}"
         return f"No instance found on port {port}"
 
+@mcp.tool()
+def discover_instances() -> dict:
+    """Auto-discover Ghidra instances by scanning ports"""
+    found_instances = []
+    
+    for port in DISCOVERY_PORT_RANGE:
+        if port in active_instances:
+            continue
+            
+        url = f"http://{ghidra_host}:{port}"
+        try:
+            test_url = f"{url}/instances"
+            response = requests.get(test_url, timeout=1)  # Short timeout for scanning
+            if response.ok:
+                result = register_instance(port, url)
+                found_instances.append({"port": port, "url": url, "result": result})
+        except requests.exceptions.RequestException:
+            # Instance not available, just continue
+            continue
+    
+    return {
+        "found": len(found_instances),
+        "instances": found_instances
+    }
+
 # Updated tool implementations with port parameter
 from urllib.parse import quote
 
@@ -210,9 +273,47 @@ import os
 def handle_sigint(signum, frame):
     os._exit(0)
 
+def periodic_discovery():
+    """Periodically discover new instances"""
+    while True:
+        try:
+            discover_instances()
+            # Also check if any existing instances are down
+            with instances_lock:
+                ports_to_remove = []
+                for port, info in active_instances.items():
+                    url = info["url"]
+                    try:
+                        response = requests.get(f"{url}/instances", timeout=1)
+                        if not response.ok:
+                            ports_to_remove.append(port)
+                    except requests.exceptions.RequestException:
+                        ports_to_remove.append(port)
+                
+                # Remove any instances that are down
+                for port in ports_to_remove:
+                    del active_instances[port]
+                    print(f"Removed unreachable instance on port {port}")
+        except Exception as e:
+            print(f"Error in periodic discovery: {e}")
+        
+        # Sleep for 30 seconds before next scan
+        time.sleep(30)
+
 if __name__ == "__main__":
     # Auto-register default instance
     register_instance(DEFAULT_GHIDRA_PORT, f"http://{ghidra_host}:{DEFAULT_GHIDRA_PORT}")
     
+    # Auto-discover other instances
+    discover_instances()
+    
+    # Start periodic discovery in background thread
+    discovery_thread = threading.Thread(
+        target=periodic_discovery, 
+        daemon=True,
+        name="GhydraMCP-Discovery"
+    )
+    discovery_thread.start()
+    
     signal.signal(signal.SIGINT, handle_sigint)
     mcp.run()

pom.xml

@@ -70,6 +70,13 @@
       <systemPath>${ghidra.jar.location}/Base.jar</systemPath>
     </dependency>
     
+    <!-- JSON Simple for JSON handling -->
+    <dependency>
+      <groupId>com.googlecode.json-simple</groupId>
+      <artifactId>json-simple</artifactId>
+      <version>1.1.1</version>
+    </dependency>
+
     <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>

src/main/java/eu/starsong/ghidra/GhydraMCPPlugin.java

@@ -11,6 +11,8 @@ import ghidra.app.decompiler.DecompInterface;
 import ghidra.app.decompiler.DecompileResults;
 import ghidra.app.plugin.PluginCategoryNames;
 import ghidra.app.services.ProgramManager;
+import ghidra.framework.model.Project;
+import ghidra.framework.model.DomainFile;
 import ghidra.framework.plugintool.PluginInfo;
 import ghidra.framework.plugintool.util.PluginStatus;
 import ghidra.util.Msg;
@@ -30,6 +32,9 @@ import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.*;
 
+// For JSON response handling
+import org.json.simple.JSONObject;
+
 @PluginInfo(
     status = PluginStatus.RELEASED,
     packageName = ghidra.app.DeveloperPluginPackage.NAME,
@@ -208,6 +213,24 @@ public class GhydraMCPPlugin extends Plugin implements ApplicationLevelPlugin {
             sendResponse(exchange, sb.toString());
         });
         
+        // Info endpoints - both root and /info for flexibility
+        server.createContext("/info", exchange -> {
+            if ("GET".equals(exchange.getRequestMethod())) {
+                sendJsonResponse(exchange, getProjectInfo());
+            } else {
+                exchange.sendResponseHeaders(405, -1); // Method Not Allowed
+            }
+        });
+        
+        // Root endpoint also returns project info
+        server.createContext("/", exchange -> {
+            if ("GET".equals(exchange.getRequestMethod())) {
+                sendJsonResponse(exchange, getProjectInfo());
+            } else {
+                exchange.sendResponseHeaders(405, -1); // Method Not Allowed
+            }
+        });
+
         server.createContext("/registerInstance", exchange -> {
             Map<String, String> params = parsePostParams(exchange);
             int port = parseIntOrDefault(params.get("port"), 0);
@@ -551,6 +574,52 @@ public class GhydraMCPPlugin extends Plugin implements ApplicationLevelPlugin {
         return pm != null ? pm.getCurrentProgram() : null;
     }
     
+    /**
+     * Get information about the current project and open file in JSON format
+     */
+    private JSONObject getProjectInfo() {
+        JSONObject info = new JSONObject();
+        Program program = getCurrentProgram();
+        
+        // Get project information if available
+        Project project = tool.getProject();
+        if (project != null) {
+            info.put("project", project.getName());
+        } else {
+            info.put("project", "Unknown");
+        }
+        
+        // Create file information object
+        JSONObject fileInfo = new JSONObject();
+        
+        // Get current file information if available
+        if (program != null) {
+            // Basic info
+            fileInfo.put("name", program.getName());
+            
+            // Try to get more detailed info
+            DomainFile domainFile = program.getDomainFile();
+            if (domainFile != null) {
+                fileInfo.put("path", domainFile.getPathname());
+            }
+            
+            // Add any additional file info we might want
+            fileInfo.put("architecture", program.getLanguage().getProcessor().toString());
+            fileInfo.put("endian", program.getLanguage().isBigEndian() ? "big" : "little");
+            
+            info.put("file", fileInfo);
+        } else {
+            info.put("file", null);
+            info.put("status", "No file open");
+        }
+        
+        // Add server metadata
+        info.put("port", port);
+        info.put("isBaseInstance", isBaseInstance);
+        
+        return info;
+    }
+
     private void sendResponse(HttpExchange exchange, String response) throws IOException {
         byte[] bytes = response.getBytes(StandardCharsets.UTF_8);
         exchange.getResponseHeaders().set("Content-Type", "text/plain; charset=utf-8");
@@ -560,6 +629,19 @@ public class GhydraMCPPlugin extends Plugin implements ApplicationLevelPlugin {
         }
     }
     
+    /**
+     * Send a JSON response to the client
+     */
+    private void sendJsonResponse(HttpExchange exchange, JSONObject json) throws IOException {
+        String jsonString = json.toJSONString();
+        byte[] bytes = jsonString.getBytes(StandardCharsets.UTF_8);
+        exchange.getResponseHeaders().set("Content-Type", "application/json; charset=utf-8");
+        exchange.sendResponseHeaders(200, bytes.length);
+        try (OutputStream os = exchange.getResponseBody()) {
+            os.write(bytes);
+        }
+    }
+
     private int findAvailablePort() {
         int basePort = 8192;
         int maxAttempts = 10;