scsi: esp: check buffer length before reading scsi command
[qemu.git] / qga / service-win32.c
1 /*
2 * QEMU Guest Agent helpers for win32 service management
3 *
4 * Copyright IBM Corp. 2012
5 *
6 * Authors:
7 * Gal Hammer <ghammer@redhat.com>
8 * Michael Roth <mdroth@linux.vnet.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 */
13 #include "qemu/osdep.h"
14 #include <windows.h>
15 #include "qga/service-win32.h"
16
17 static int printf_win_error(const char *text)
18 {
19 DWORD err = GetLastError();
20 char *message;
21 int n;
22
23 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
24 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
25 NULL,
26 err,
27 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
28 (char *)&message, 0,
29 NULL);
30 n = fprintf(stderr, "%s. (Error: %d) %s", text, (int)err, message);
31 LocalFree(message);
32
33 return n;
34 }
35
36 /* Windows command line escaping. Based on
37 * <http://blogs.msdn.com/b/oldnewthing/archive/2010/09/17/10063629.aspx> and
38 * <http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft%28v=vs.85%29.aspx>.
39 *
40 * The caller is responsible for initializing @buffer; prior contents are lost.
41 */
42 static const char *win_escape_arg(const char *to_escape, GString *buffer)
43 {
44 size_t backslash_count;
45 const char *c;
46
47 /* open with a double quote */
48 g_string_assign(buffer, "\"");
49
50 backslash_count = 0;
51 for (c = to_escape; *c != '\0'; ++c) {
52 switch (*c) {
53 case '\\':
54 /* The meaning depends on the first non-backslash character coming
55 * up.
56 */
57 ++backslash_count;
58 break;
59
60 case '"':
61 /* We must escape each pending backslash, then escape the double
62 * quote. This creates a case of "odd number of backslashes [...]
63 * followed by a double quotation mark".
64 */
65 while (backslash_count) {
66 --backslash_count;
67 g_string_append(buffer, "\\\\");
68 }
69 g_string_append(buffer, "\\\"");
70 break;
71
72 default:
73 /* Any pending backslashes are without special meaning, flush them.
74 * "Backslashes are interpreted literally, unless they immediately
75 * precede a double quotation mark."
76 */
77 while (backslash_count) {
78 --backslash_count;
79 g_string_append_c(buffer, '\\');
80 }
81 g_string_append_c(buffer, *c);
82 }
83 }
84
85 /* We're about to close with a double quote in string delimiter role.
86 * Double all pending backslashes, creating a case of "even number of
87 * backslashes [...] followed by a double quotation mark".
88 */
89 while (backslash_count) {
90 --backslash_count;
91 g_string_append(buffer, "\\\\");
92 }
93 g_string_append_c(buffer, '"');
94
95 return buffer->str;
96 }
97
98 int ga_install_service(const char *path, const char *logfile,
99 const char *state_dir)
100 {
101 int ret = EXIT_FAILURE;
102 SC_HANDLE manager;
103 SC_HANDLE service;
104 TCHAR module_fname[MAX_PATH];
105 GString *esc;
106 GString *cmdline;
107 SERVICE_DESCRIPTION desc = { (char *)QGA_SERVICE_DESCRIPTION };
108
109 if (GetModuleFileName(NULL, module_fname, MAX_PATH) == 0) {
110 printf_win_error("No full path to service's executable");
111 return EXIT_FAILURE;
112 }
113
114 esc = g_string_new("");
115 cmdline = g_string_new("");
116
117 g_string_append_printf(cmdline, "%s -d",
118 win_escape_arg(module_fname, esc));
119
120 if (path) {
121 g_string_append_printf(cmdline, " -p %s", win_escape_arg(path, esc));
122 }
123 if (logfile) {
124 g_string_append_printf(cmdline, " -l %s -v",
125 win_escape_arg(logfile, esc));
126 }
127 if (state_dir) {
128 g_string_append_printf(cmdline, " -t %s",
129 win_escape_arg(state_dir, esc));
130 }
131
132 g_debug("service's cmdline: %s", cmdline->str);
133
134 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
135 if (manager == NULL) {
136 printf_win_error("No handle to service control manager");
137 goto out_strings;
138 }
139
140 service = CreateService(manager, QGA_SERVICE_NAME, QGA_SERVICE_DISPLAY_NAME,
141 SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START,
142 SERVICE_ERROR_NORMAL, cmdline->str, NULL, NULL, NULL, NULL, NULL);
143 if (service == NULL) {
144 printf_win_error("Failed to install service");
145 goto out_manager;
146 }
147
148 ChangeServiceConfig2(service, SERVICE_CONFIG_DESCRIPTION, &desc);
149 fprintf(stderr, "Service was installed successfully.\n");
150 ret = EXIT_SUCCESS;
151 CloseServiceHandle(service);
152
153 out_manager:
154 CloseServiceHandle(manager);
155
156 out_strings:
157 g_string_free(cmdline, TRUE);
158 g_string_free(esc, TRUE);
159 return ret;
160 }
161
162 int ga_uninstall_service(void)
163 {
164 SC_HANDLE manager;
165 SC_HANDLE service;
166
167 manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
168 if (manager == NULL) {
169 printf_win_error("No handle to service control manager");
170 return EXIT_FAILURE;
171 }
172
173 service = OpenService(manager, QGA_SERVICE_NAME, DELETE);
174 if (service == NULL) {
175 printf_win_error("No handle to service");
176 CloseServiceHandle(manager);
177 return EXIT_FAILURE;
178 }
179
180 if (DeleteService(service) == FALSE) {
181 printf_win_error("Failed to delete service");
182 } else {
183 fprintf(stderr, "Service was deleted successfully.\n");
184 }
185
186 CloseServiceHandle(service);
187 CloseServiceHandle(manager);
188
189 return EXIT_SUCCESS;
190 }