191 lines
5.5 KiB
C
191 lines
5.5 KiB
C
/*
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* QEMU Guest Agent helpers for win32 service management
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*
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* Copyright IBM Corp. 2012
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*
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* Authors:
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* Gal Hammer <ghammer@redhat.com>
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <windows.h>
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#include "qga/service-win32.h"
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static int printf_win_error(const char *text)
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{
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DWORD err = GetLastError();
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char *message;
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int n;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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err,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(char *)&message, 0,
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NULL);
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n = fprintf(stderr, "%s. (Error: %d) %s", text, (int)err, message);
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LocalFree(message);
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return n;
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}
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/* Windows command line escaping. Based on
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* <http://blogs.msdn.com/b/oldnewthing/archive/2010/09/17/10063629.aspx> and
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* <http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft%28v=vs.85%29.aspx>.
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*
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* The caller is responsible for initializing @buffer; prior contents are lost.
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*/
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static const char *win_escape_arg(const char *to_escape, GString *buffer)
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{
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size_t backslash_count;
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const char *c;
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/* open with a double quote */
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g_string_assign(buffer, "\"");
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backslash_count = 0;
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for (c = to_escape; *c != '\0'; ++c) {
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switch (*c) {
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case '\\':
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/* The meaning depends on the first non-backslash character coming
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* up.
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*/
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++backslash_count;
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break;
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case '"':
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/* We must escape each pending backslash, then escape the double
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* quote. This creates a case of "odd number of backslashes [...]
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* followed by a double quotation mark".
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*/
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while (backslash_count) {
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--backslash_count;
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g_string_append(buffer, "\\\\");
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}
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g_string_append(buffer, "\\\"");
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break;
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default:
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/* Any pending backslashes are without special meaning, flush them.
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* "Backslashes are interpreted literally, unless they immediately
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* precede a double quotation mark."
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*/
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while (backslash_count) {
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--backslash_count;
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g_string_append_c(buffer, '\\');
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}
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g_string_append_c(buffer, *c);
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}
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}
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/* We're about to close with a double quote in string delimiter role.
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* Double all pending backslashes, creating a case of "even number of
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* backslashes [...] followed by a double quotation mark".
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*/
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while (backslash_count) {
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--backslash_count;
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g_string_append(buffer, "\\\\");
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}
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g_string_append_c(buffer, '"');
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return buffer->str;
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}
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int ga_install_service(const char *path, const char *logfile,
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const char *state_dir)
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{
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int ret = EXIT_FAILURE;
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SC_HANDLE manager;
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SC_HANDLE service;
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TCHAR module_fname[MAX_PATH];
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GString *esc;
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GString *cmdline;
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SERVICE_DESCRIPTION desc = { (char *)QGA_SERVICE_DESCRIPTION };
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if (GetModuleFileName(NULL, module_fname, MAX_PATH) == 0) {
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printf_win_error("No full path to service's executable");
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return EXIT_FAILURE;
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}
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esc = g_string_new("");
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cmdline = g_string_new("");
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g_string_append_printf(cmdline, "%s -d",
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win_escape_arg(module_fname, esc));
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if (path) {
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g_string_append_printf(cmdline, " -p %s", win_escape_arg(path, esc));
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}
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if (logfile) {
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g_string_append_printf(cmdline, " -l %s -v",
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win_escape_arg(logfile, esc));
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}
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if (state_dir) {
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g_string_append_printf(cmdline, " -t %s",
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win_escape_arg(state_dir, esc));
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}
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g_debug("service's cmdline: %s", cmdline->str);
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manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
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if (manager == NULL) {
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printf_win_error("No handle to service control manager");
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goto out_strings;
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}
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service = CreateService(manager, QGA_SERVICE_NAME, QGA_SERVICE_DISPLAY_NAME,
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SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START,
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SERVICE_ERROR_NORMAL, cmdline->str, NULL, NULL, NULL, NULL, NULL);
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if (service == NULL) {
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printf_win_error("Failed to install service");
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goto out_manager;
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}
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ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &desc);
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fprintf(stderr, "Service was installed successfully.\n");
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ret = EXIT_SUCCESS;
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CloseServiceHandle(service);
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out_manager:
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CloseServiceHandle(manager);
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out_strings:
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g_string_free(cmdline, TRUE);
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g_string_free(esc, TRUE);
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return ret;
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}
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int ga_uninstall_service(void)
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{
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SC_HANDLE manager;
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SC_HANDLE service;
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manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
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if (manager == NULL) {
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printf_win_error("No handle to service control manager");
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return EXIT_FAILURE;
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}
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service = OpenService(manager, QGA_SERVICE_NAME, DELETE);
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if (service == NULL) {
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printf_win_error("No handle to service");
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CloseServiceHandle(manager);
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return EXIT_FAILURE;
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}
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if (DeleteService(service) == FALSE) {
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printf_win_error("Failed to delete service");
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} else {
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fprintf(stderr, "Service was deleted successfully.\n");
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}
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CloseServiceHandle(service);
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CloseServiceHandle(manager);
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return EXIT_SUCCESS;
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}
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