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/*
* 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 "qemu/osdep.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 = fprintf(stderr, "%s. (Error: %d) %s", text, (int)err, message);
LocalFree(message);
return n;
}
/* Windows command line escaping. Based on
* <http://blogs.msdn.com/b/oldnewthing/archive/2010/09/17/10063629.aspx> and
* <http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft%28v=vs.85%29.aspx>.
*
* The caller is responsible for initializing @buffer; prior contents are lost.
*/
static const char *win_escape_arg(const char *to_escape, GString *buffer)
{
size_t backslash_count;
const char *c;
/* open with a double quote */
g_string_assign(buffer, "\"");
backslash_count = 0;
for (c = to_escape; *c != '\0'; ++c) {
switch (*c) {
case '\\':
/* The meaning depends on the first non-backslash character coming
* up.
*/
++backslash_count;
break;
case '"':
/* We must escape each pending backslash, then escape the double
* quote. This creates a case of "odd number of backslashes [...]
* followed by a double quotation mark".
*/
while (backslash_count) {
--backslash_count;
g_string_append(buffer, "\\\\");
}
g_string_append(buffer, "\\\"");
break;
default:
/* Any pending backslashes are without special meaning, flush them.
* "Backslashes are interpreted literally, unless they immediately
* precede a double quotation mark."
*/
while (backslash_count) {
--backslash_count;
g_string_append_c(buffer, '\\');
}
g_string_append_c(buffer, *c);
}
}
/* We're about to close with a double quote in string delimiter role.
* Double all pending backslashes, creating a case of "even number of
* backslashes [...] followed by a double quotation mark".
*/
while (backslash_count) {
--backslash_count;
g_string_append(buffer, "\\\\");
}
g_string_append_c(buffer, '"');
return buffer->str;
}
int ga_install_service(const char *path, const char *logfile,
const char *state_dir)
{
int ret = EXIT_FAILURE;
SC_HANDLE manager;
SC_HANDLE service;
TCHAR module_fname[MAX_PATH];
GString *esc;
GString *cmdline;
SERVICE_DESCRIPTION desc = { (char *)QGA_SERVICE_DESCRIPTION };
if (GetModuleFileName(NULL, module_fname, MAX_PATH) == 0) {
printf_win_error("No full path to service's executable");
return EXIT_FAILURE;
}
esc = g_string_new("");
cmdline = g_string_new("");
g_string_append_printf(cmdline, "%s -d",
win_escape_arg(module_fname, esc));
if (path) {
g_string_append_printf(cmdline, " -p %s", win_escape_arg(path, esc));
}
if (logfile) {
g_string_append_printf(cmdline, " -l %s -v",
win_escape_arg(logfile, esc));
}
if (state_dir) {
g_string_append_printf(cmdline, " -t %s",
win_escape_arg(state_dir, esc));
}
g_debug("service's cmdline: %s", cmdline->str);
manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
if (manager == NULL) {
printf_win_error("No handle to service control manager");
goto out_strings;
}
service = CreateService(manager, QGA_SERVICE_NAME, QGA_SERVICE_DISPLAY_NAME,
SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START,
SERVICE_ERROR_NORMAL, cmdline->str, NULL, NULL, NULL, NULL, NULL);
if (service == NULL) {
printf_win_error("Failed to install service");
goto out_manager;
}
ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &desc);
fprintf(stderr, "Service was installed successfully.\n");
ret = EXIT_SUCCESS;
CloseServiceHandle(service);
out_manager:
CloseServiceHandle(manager);
out_strings:
g_string_free(cmdline, TRUE);
g_string_free(esc, TRUE);
return ret;
}
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 {
fprintf(stderr, "Service was deleted successfully.\n");
}
CloseServiceHandle(service);
CloseServiceHandle(manager);
return EXIT_SUCCESS;
}
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