qemu-ga: add Windows service integration

This allows qemu-ga to function as a Windows service:

 - to install the service (will auto-start on boot):
     qemu-ga --service install
 - to start the service:
     net start qemu-ga
 - to stop the service:
     net stop qemu-ga
 - to uninstall service:
     qemu-ga --service uninstall

Original patch by Gal Hammer <ghammer@redhat.com>

2 files changed, 144 insertions, 0 deletions

diff --git a/qga/service-win32.c b/qga/service-win32.c
new file mode 100644
index 0000000..0905456
--- /dev/null
+++ b/qga/service-win32.c
@@ -0,0 +1,114 @@
+/*
+ * QEMU Guest Agent helpers for win32 service management
+ *
+ * Copyright IBM Corp. 2012
+ *
+ * Authors:
+ *  Gal Hammer        <ghammer@redhat.com>
+ *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <glib.h>
+#include <windows.h>
+#include "qga/service-win32.h"
+
+static int printf_win_error(const char *text)
+{
+    DWORD err = GetLastError();
+    char *message;
+    int n;
+
+    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+        FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+        NULL,
+        err,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (char *)&message, 0,
+        NULL);
+    n = printf("%s. (Error: %d) %s", text, err, message);
+    LocalFree(message);
+
+    return n;
+}
+
+int ga_install_service(const char *path, const char *logfile)
+{
+    SC_HANDLE manager;
+    SC_HANDLE service;
+    TCHAR cmdline[MAX_PATH];
+
+    if (GetModuleFileName(NULL, cmdline, MAX_PATH) == 0) {
+        printf_win_error("No full path to service's executable");
+        return EXIT_FAILURE;
+    }
+
+    _snprintf(cmdline, MAX_PATH - strlen(cmdline), "%s -d", cmdline);
+
+    if (path) {
+        _snprintf(cmdline, MAX_PATH - strlen(cmdline), "%s -p %s", cmdline, path);
+    }
+    if (logfile) {
+        _snprintf(cmdline, MAX_PATH - strlen(cmdline), "%s -l %s -v",
+            cmdline, logfile);
+    }
+
+    g_debug("service's cmdline: %s", cmdline);
+
+    manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if (manager == NULL) {
+        printf_win_error("No handle to service control manager");
+        return EXIT_FAILURE;
+    }
+
+    service = CreateService(manager, QGA_SERVICE_NAME, QGA_SERVICE_DISPLAY_NAME,
+        SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START,
+        SERVICE_ERROR_NORMAL, cmdline, NULL, NULL, NULL, NULL, NULL);
+
+    if (service) {
+        SERVICE_DESCRIPTION desc = { (char *)QGA_SERVICE_DESCRIPTION };
+        ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &desc);
+
+        printf("Service was installed successfully.\n");
+    } else {
+        printf_win_error("Failed to install service");
+    }
+
+    CloseServiceHandle(service);
+    CloseServiceHandle(manager);
+
+    return (service == NULL);
+}
+
+int ga_uninstall_service(void)
+{
+    SC_HANDLE manager;
+    SC_HANDLE service;
+
+    manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+    if (manager == NULL) {
+        printf_win_error("No handle to service control manager");
+        return EXIT_FAILURE;
+    }
+
+    service = OpenService(manager, QGA_SERVICE_NAME, DELETE);
+    if (service == NULL) {
+        printf_win_error("No handle to service");
+        CloseServiceHandle(manager);
+        return EXIT_FAILURE;
+    }
+
+    if (DeleteService(service) == FALSE) {
+        printf_win_error("Failed to delete service");
+    } else {
+        printf("Service was deleted successfully.\n");
+    }
+
+    CloseServiceHandle(service);
+    CloseServiceHandle(manager);
+
+    return EXIT_SUCCESS;
+}
diff --git a/qga/service-win32.h b/qga/service-win32.h
new file mode 100644
index 0000000..99dfc53
--- /dev/null
+++ b/qga/service-win32.h
@@ -0,0 +1,30 @@
+/*
+ * QEMU Guest Agent helpers for win32 service management
+ *
+ * Copyright IBM Corp. 2012
+ *
+ * Authors:
+ *  Gal Hammer        <ghammer@redhat.com>
+ *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef QGA_SERVICE_H
+#define QGA_SERVICE_H
+
+#include <windows.h>
+
+#define QGA_SERVICE_DISPLAY_NAME "QEMU Guest Agent"
+#define QGA_SERVICE_NAME         "qemu-ga"
+#define QGA_SERVICE_DESCRIPTION  "Enables integration with QEMU machine emulator and virtualizer."
+
+typedef struct GAService {
+    SERVICE_STATUS status;
+    SERVICE_STATUS_HANDLE status_handle;
+} GAService;
+
+int ga_install_service(const char *path, const char *logfile);
+int ga_uninstall_service(void);
+
+#endif