summaryrefslogtreecommitdiff
path: root/qga/commands-win32.c
blob: 7a37f5cadd0268ed1c939aef116cf29c526a70a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
/*
 * QEMU Guest Agent win32-specific command implementations
 *
 * Copyright IBM Corp. 2012
 *
 * Authors:
 *  Michael Roth      <mdroth@linux.vnet.ibm.com>
 *  Gal Hammer        <ghammer@redhat.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 <glib.h>
#include <wtypes.h>
#include <powrprof.h>
#include "qga/guest-agent-core.h"
#include "qga/vss-win32.h"
#include "qga-qmp-commands.h"
#include "qapi/qmp/qerror.h"

#ifndef SHTDN_REASON_FLAG_PLANNED
#define SHTDN_REASON_FLAG_PLANNED 0x80000000
#endif

/* multiple of 100 nanoseconds elapsed between windows baseline
 *    (1/1/1601) and Unix Epoch (1/1/1970), accounting for leap years */
#define W32_FT_OFFSET (10000000ULL * 60 * 60 * 24 * \
                       (365 * (1970 - 1601) +       \
                        (1970 - 1601) / 4 - 3))

static void acquire_privilege(const char *name, Error **err)
{
    HANDLE token;
    TOKEN_PRIVILEGES priv;
    Error *local_err = NULL;

    if (error_is_set(err)) {
        return;
    }

    if (OpenProcessToken(GetCurrentProcess(),
        TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY, &token))
    {
        if (!LookupPrivilegeValue(NULL, name, &priv.Privileges[0].Luid)) {
            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                      "no luid for requested privilege");
            goto out;
        }

        priv.PrivilegeCount = 1;
        priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

        if (!AdjustTokenPrivileges(token, FALSE, &priv, 0, NULL, 0)) {
            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                      "unable to acquire requested privilege");
            goto out;
        }

        CloseHandle(token);
    } else {
        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                  "failed to open privilege token");
    }

out:
    if (local_err) {
        error_propagate(err, local_err);
    }
}

static void execute_async(DWORD WINAPI (*func)(LPVOID), LPVOID opaque, Error **err)
{
    Error *local_err = NULL;

    if (error_is_set(err)) {
        return;
    }
    HANDLE thread = CreateThread(NULL, 0, func, opaque, 0, NULL);
    if (!thread) {
        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                  "failed to dispatch asynchronous command");
        error_propagate(err, local_err);
    }
}

void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
{
    UINT shutdown_flag = EWX_FORCE;

    slog("guest-shutdown called, mode: %s", mode);

    if (!has_mode || strcmp(mode, "powerdown") == 0) {
        shutdown_flag |= EWX_POWEROFF;
    } else if (strcmp(mode, "halt") == 0) {
        shutdown_flag |= EWX_SHUTDOWN;
    } else if (strcmp(mode, "reboot") == 0) {
        shutdown_flag |= EWX_REBOOT;
    } else {
        error_set(err, QERR_INVALID_PARAMETER_VALUE, "mode",
                  "halt|powerdown|reboot");
        return;
    }

    /* Request a shutdown privilege, but try to shut down the system
       anyway. */
    acquire_privilege(SE_SHUTDOWN_NAME, err);
    if (error_is_set(err)) {
        return;
    }

    if (!ExitWindowsEx(shutdown_flag, SHTDN_REASON_FLAG_PLANNED)) {
        slog("guest-shutdown failed: %d", GetLastError());
        error_set(err, QERR_UNDEFINED_ERROR);
    }
}

int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
    return 0;
}

void qmp_guest_file_close(int64_t handle, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
}

GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
                                   int64_t count, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
    return 0;
}

GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
                                     bool has_count, int64_t count, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
    return 0;
}

GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
                                   int64_t whence, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
    return 0;
}

void qmp_guest_file_flush(int64_t handle, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
}

/*
 * Return status of freeze/thaw
 */
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
{
    if (!vss_initialized()) {
        error_set(err, QERR_UNSUPPORTED);
        return 0;
    }

    if (ga_is_frozen(ga_state)) {
        return GUEST_FSFREEZE_STATUS_FROZEN;
    }

    return GUEST_FSFREEZE_STATUS_THAWED;
}

/*
 * Freeze local file systems using Volume Shadow-copy Service.
 * The frozen state is limited for up to 10 seconds by VSS.
 */
int64_t qmp_guest_fsfreeze_freeze(Error **err)
{
    int i;
    Error *local_err = NULL;

    if (!vss_initialized()) {
        error_set(err, QERR_UNSUPPORTED);
        return 0;
    }

    slog("guest-fsfreeze called");

    /* cannot risk guest agent blocking itself on a write in this state */
    ga_set_frozen(ga_state);

    qga_vss_fsfreeze(&i, err, true);
    if (error_is_set(err)) {
        goto error;
    }

    return i;

error:
    qmp_guest_fsfreeze_thaw(&local_err);
    if (error_is_set(&local_err)) {
        g_debug("cleanup thaw: %s", error_get_pretty(local_err));
        error_free(local_err);
    }
    return 0;
}

/*
 * Thaw local file systems using Volume Shadow-copy Service.
 */
int64_t qmp_guest_fsfreeze_thaw(Error **err)
{
    int i;

    if (!vss_initialized()) {
        error_set(err, QERR_UNSUPPORTED);
        return 0;
    }

    qga_vss_fsfreeze(&i, err, false);

    ga_unset_frozen(ga_state);
    return i;
}

static void guest_fsfreeze_cleanup(void)
{
    Error *err = NULL;

    if (!vss_initialized()) {
        return;
    }

    if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
        qmp_guest_fsfreeze_thaw(&err);
        if (err) {
            slog("failed to clean up frozen filesystems: %s",
                 error_get_pretty(err));
            error_free(err);
        }
    }

    vss_deinit(true);
}

/*
 * Walk list of mounted file systems in the guest, and discard unused
 * areas.
 */
void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
}

typedef enum {
    GUEST_SUSPEND_MODE_DISK,
    GUEST_SUSPEND_MODE_RAM
} GuestSuspendMode;

static void check_suspend_mode(GuestSuspendMode mode, Error **err)
{
    SYSTEM_POWER_CAPABILITIES sys_pwr_caps;
    Error *local_err = NULL;

    if (error_is_set(err)) {
        return;
    }
    ZeroMemory(&sys_pwr_caps, sizeof(sys_pwr_caps));
    if (!GetPwrCapabilities(&sys_pwr_caps)) {
        error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                  "failed to determine guest suspend capabilities");
        goto out;
    }

    switch (mode) {
    case GUEST_SUSPEND_MODE_DISK:
        if (!sys_pwr_caps.SystemS4) {
            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                      "suspend-to-disk not supported by OS");
        }
        break;
    case GUEST_SUSPEND_MODE_RAM:
        if (!sys_pwr_caps.SystemS3) {
            error_set(&local_err, QERR_QGA_COMMAND_FAILED,
                      "suspend-to-ram not supported by OS");
        }
        break;
    default:
        error_set(&local_err, QERR_INVALID_PARAMETER_VALUE, "mode",
                  "GuestSuspendMode");
    }

out:
    if (local_err) {
        error_propagate(err, local_err);
    }
}

static DWORD WINAPI do_suspend(LPVOID opaque)
{
    GuestSuspendMode *mode = opaque;
    DWORD ret = 0;

    if (!SetSuspendState(*mode == GUEST_SUSPEND_MODE_DISK, TRUE, TRUE)) {
        slog("failed to suspend guest, %s", GetLastError());
        ret = -1;
    }
    g_free(mode);
    return ret;
}

void qmp_guest_suspend_disk(Error **err)
{
    GuestSuspendMode *mode = g_malloc(sizeof(GuestSuspendMode));

    *mode = GUEST_SUSPEND_MODE_DISK;
    check_suspend_mode(*mode, err);
    acquire_privilege(SE_SHUTDOWN_NAME, err);
    execute_async(do_suspend, mode, err);

    if (error_is_set(err)) {
        g_free(mode);
    }
}

void qmp_guest_suspend_ram(Error **err)
{
    GuestSuspendMode *mode = g_malloc(sizeof(GuestSuspendMode));

    *mode = GUEST_SUSPEND_MODE_RAM;
    check_suspend_mode(*mode, err);
    acquire_privilege(SE_SHUTDOWN_NAME, err);
    execute_async(do_suspend, mode, err);

    if (error_is_set(err)) {
        g_free(mode);
    }
}

void qmp_guest_suspend_hybrid(Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
}

GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **err)
{
    error_set(err, QERR_UNSUPPORTED);
    return NULL;
}

int64_t qmp_guest_get_time(Error **errp)
{
    SYSTEMTIME ts = {0};
    int64_t time_ns;
    FILETIME tf;

    GetSystemTime(&ts);
    if (ts.wYear < 1601 || ts.wYear > 30827) {
        error_setg(errp, "Failed to get time");
        return -1;
    }

    if (!SystemTimeToFileTime(&ts, &tf)) {
        error_setg(errp, "Failed to convert system time: %d", (int)GetLastError());
        return -1;
    }

    time_ns = ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
                - W32_FT_OFFSET) * 100;

    return time_ns;
}

void qmp_guest_set_time(int64_t time_ns, Error **errp)
{
    SYSTEMTIME ts;
    FILETIME tf;
    LONGLONG time;

    if (time_ns < 0 || time_ns / 100 > INT64_MAX - W32_FT_OFFSET) {
        error_setg(errp, "Time %" PRId64 "is invalid", time_ns);
        return;
    }

    time = time_ns / 100 + W32_FT_OFFSET;

    tf.dwLowDateTime = (DWORD) time;
    tf.dwHighDateTime = (DWORD) (time >> 32);

    if (!FileTimeToSystemTime(&tf, &ts)) {
        error_setg(errp, "Failed to convert system time %d", (int)GetLastError());
        return;
    }

    acquire_privilege(SE_SYSTEMTIME_NAME, errp);
    if (error_is_set(errp)) {
        return;
    }

    if (!SetSystemTime(&ts)) {
        error_setg(errp, "Failed to set time to guest: %d", (int)GetLastError());
        return;
    }
}

GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
{
    error_set(errp, QERR_UNSUPPORTED);
    return NULL;
}

int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
{
    error_set(errp, QERR_UNSUPPORTED);
    return -1;
}

/* register init/cleanup routines for stateful command groups */
void ga_command_state_init(GAState *s, GACommandState *cs)
{
    if (vss_init(true)) {
        ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
    }
}