qapi2texi: Fix up output around #optional
[qemu.git] / qga / commands-posix.c
1 /*
2 * QEMU Guest Agent POSIX-specific command implementations
3 *
4 * Copyright IBM Corp. 2011
5 *
6 * Authors:
7 * Michael Roth <mdroth@linux.vnet.ibm.com>
8 * Michal Privoznik <mprivozn@redhat.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
14 #include "qemu/osdep.h"
15 #include <sys/ioctl.h>
16 #include <sys/wait.h>
17 #include <dirent.h>
18 #include "qga/guest-agent-core.h"
19 #include "qga-qmp-commands.h"
20 #include "qapi/qmp/qerror.h"
21 #include "qemu/queue.h"
22 #include "qemu/host-utils.h"
23 #include "qemu/sockets.h"
24 #include "qemu/base64.h"
25 #include "qemu/cutils.h"
26
27 #ifndef CONFIG_HAS_ENVIRON
28 #ifdef __APPLE__
29 #include <crt_externs.h>
30 #define environ (*_NSGetEnviron())
31 #else
32 extern char **environ;
33 #endif
34 #endif
35
36 #if defined(__linux__)
37 #include <mntent.h>
38 #include <linux/fs.h>
39 #include <ifaddrs.h>
40 #include <arpa/inet.h>
41 #include <sys/socket.h>
42 #include <net/if.h>
43
44 #ifdef FIFREEZE
45 #define CONFIG_FSFREEZE
46 #endif
47 #ifdef FITRIM
48 #define CONFIG_FSTRIM
49 #endif
50 #endif
51
52 static void ga_wait_child(pid_t pid, int *status, Error **errp)
53 {
54 pid_t rpid;
55
56 *status = 0;
57
58 do {
59 rpid = waitpid(pid, status, 0);
60 } while (rpid == -1 && errno == EINTR);
61
62 if (rpid == -1) {
63 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
64 pid);
65 return;
66 }
67
68 g_assert(rpid == pid);
69 }
70
71 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
72 {
73 const char *shutdown_flag;
74 Error *local_err = NULL;
75 pid_t pid;
76 int status;
77
78 slog("guest-shutdown called, mode: %s", mode);
79 if (!has_mode || strcmp(mode, "powerdown") == 0) {
80 shutdown_flag = "-P";
81 } else if (strcmp(mode, "halt") == 0) {
82 shutdown_flag = "-H";
83 } else if (strcmp(mode, "reboot") == 0) {
84 shutdown_flag = "-r";
85 } else {
86 error_setg(errp,
87 "mode is invalid (valid values are: halt|powerdown|reboot");
88 return;
89 }
90
91 pid = fork();
92 if (pid == 0) {
93 /* child, start the shutdown */
94 setsid();
95 reopen_fd_to_null(0);
96 reopen_fd_to_null(1);
97 reopen_fd_to_null(2);
98
99 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
100 "hypervisor initiated shutdown", (char*)NULL, environ);
101 _exit(EXIT_FAILURE);
102 } else if (pid < 0) {
103 error_setg_errno(errp, errno, "failed to create child process");
104 return;
105 }
106
107 ga_wait_child(pid, &status, &local_err);
108 if (local_err) {
109 error_propagate(errp, local_err);
110 return;
111 }
112
113 if (!WIFEXITED(status)) {
114 error_setg(errp, "child process has terminated abnormally");
115 return;
116 }
117
118 if (WEXITSTATUS(status)) {
119 error_setg(errp, "child process has failed to shutdown");
120 return;
121 }
122
123 /* succeeded */
124 }
125
126 int64_t qmp_guest_get_time(Error **errp)
127 {
128 int ret;
129 qemu_timeval tq;
130
131 ret = qemu_gettimeofday(&tq);
132 if (ret < 0) {
133 error_setg_errno(errp, errno, "Failed to get time");
134 return -1;
135 }
136
137 return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
138 }
139
140 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
141 {
142 int ret;
143 int status;
144 pid_t pid;
145 Error *local_err = NULL;
146 struct timeval tv;
147
148 /* If user has passed a time, validate and set it. */
149 if (has_time) {
150 GDate date = { 0, };
151
152 /* year-2038 will overflow in case time_t is 32bit */
153 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
154 error_setg(errp, "Time %" PRId64 " is too large", time_ns);
155 return;
156 }
157
158 tv.tv_sec = time_ns / 1000000000;
159 tv.tv_usec = (time_ns % 1000000000) / 1000;
160 g_date_set_time_t(&date, tv.tv_sec);
161 if (date.year < 1970 || date.year >= 2070) {
162 error_setg_errno(errp, errno, "Invalid time");
163 return;
164 }
165
166 ret = settimeofday(&tv, NULL);
167 if (ret < 0) {
168 error_setg_errno(errp, errno, "Failed to set time to guest");
169 return;
170 }
171 }
172
173 /* Now, if user has passed a time to set and the system time is set, we
174 * just need to synchronize the hardware clock. However, if no time was
175 * passed, user is requesting the opposite: set the system time from the
176 * hardware clock (RTC). */
177 pid = fork();
178 if (pid == 0) {
179 setsid();
180 reopen_fd_to_null(0);
181 reopen_fd_to_null(1);
182 reopen_fd_to_null(2);
183
184 /* Use '/sbin/hwclock -w' to set RTC from the system time,
185 * or '/sbin/hwclock -s' to set the system time from RTC. */
186 execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
187 NULL, environ);
188 _exit(EXIT_FAILURE);
189 } else if (pid < 0) {
190 error_setg_errno(errp, errno, "failed to create child process");
191 return;
192 }
193
194 ga_wait_child(pid, &status, &local_err);
195 if (local_err) {
196 error_propagate(errp, local_err);
197 return;
198 }
199
200 if (!WIFEXITED(status)) {
201 error_setg(errp, "child process has terminated abnormally");
202 return;
203 }
204
205 if (WEXITSTATUS(status)) {
206 error_setg(errp, "hwclock failed to set hardware clock to system time");
207 return;
208 }
209 }
210
211 typedef enum {
212 RW_STATE_NEW,
213 RW_STATE_READING,
214 RW_STATE_WRITING,
215 } RwState;
216
217 typedef struct GuestFileHandle {
218 uint64_t id;
219 FILE *fh;
220 RwState state;
221 QTAILQ_ENTRY(GuestFileHandle) next;
222 } GuestFileHandle;
223
224 static struct {
225 QTAILQ_HEAD(, GuestFileHandle) filehandles;
226 } guest_file_state = {
227 .filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles),
228 };
229
230 static int64_t guest_file_handle_add(FILE *fh, Error **errp)
231 {
232 GuestFileHandle *gfh;
233 int64_t handle;
234
235 handle = ga_get_fd_handle(ga_state, errp);
236 if (handle < 0) {
237 return -1;
238 }
239
240 gfh = g_new0(GuestFileHandle, 1);
241 gfh->id = handle;
242 gfh->fh = fh;
243 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
244
245 return handle;
246 }
247
248 static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
249 {
250 GuestFileHandle *gfh;
251
252 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
253 {
254 if (gfh->id == id) {
255 return gfh;
256 }
257 }
258
259 error_setg(errp, "handle '%" PRId64 "' has not been found", id);
260 return NULL;
261 }
262
263 typedef const char * const ccpc;
264
265 #ifndef O_BINARY
266 #define O_BINARY 0
267 #endif
268
269 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
270 static const struct {
271 ccpc *forms;
272 int oflag_base;
273 } guest_file_open_modes[] = {
274 { (ccpc[]){ "r", NULL }, O_RDONLY },
275 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY },
276 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC },
277 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY },
278 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND },
279 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
280 { (ccpc[]){ "r+", NULL }, O_RDWR },
281 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY },
282 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC },
283 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY },
284 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND },
285 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY }
286 };
287
288 static int
289 find_open_flag(const char *mode_str, Error **errp)
290 {
291 unsigned mode;
292
293 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
294 ccpc *form;
295
296 form = guest_file_open_modes[mode].forms;
297 while (*form != NULL && strcmp(*form, mode_str) != 0) {
298 ++form;
299 }
300 if (*form != NULL) {
301 break;
302 }
303 }
304
305 if (mode == ARRAY_SIZE(guest_file_open_modes)) {
306 error_setg(errp, "invalid file open mode '%s'", mode_str);
307 return -1;
308 }
309 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
310 }
311
312 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
313 S_IRGRP | S_IWGRP | \
314 S_IROTH | S_IWOTH)
315
316 static FILE *
317 safe_open_or_create(const char *path, const char *mode, Error **errp)
318 {
319 Error *local_err = NULL;
320 int oflag;
321
322 oflag = find_open_flag(mode, &local_err);
323 if (local_err == NULL) {
324 int fd;
325
326 /* If the caller wants / allows creation of a new file, we implement it
327 * with a two step process: open() + (open() / fchmod()).
328 *
329 * First we insist on creating the file exclusively as a new file. If
330 * that succeeds, we're free to set any file-mode bits on it. (The
331 * motivation is that we want to set those file-mode bits independently
332 * of the current umask.)
333 *
334 * If the exclusive creation fails because the file already exists
335 * (EEXIST is not possible for any other reason), we just attempt to
336 * open the file, but in this case we won't be allowed to change the
337 * file-mode bits on the preexistent file.
338 *
339 * The pathname should never disappear between the two open()s in
340 * practice. If it happens, then someone very likely tried to race us.
341 * In this case just go ahead and report the ENOENT from the second
342 * open() to the caller.
343 *
344 * If the caller wants to open a preexistent file, then the first
345 * open() is decisive and its third argument is ignored, and the second
346 * open() and the fchmod() are never called.
347 */
348 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
349 if (fd == -1 && errno == EEXIST) {
350 oflag &= ~(unsigned)O_CREAT;
351 fd = open(path, oflag);
352 }
353
354 if (fd == -1) {
355 error_setg_errno(&local_err, errno, "failed to open file '%s' "
356 "(mode: '%s')", path, mode);
357 } else {
358 qemu_set_cloexec(fd);
359
360 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
361 error_setg_errno(&local_err, errno, "failed to set permission "
362 "0%03o on new file '%s' (mode: '%s')",
363 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
364 } else {
365 FILE *f;
366
367 f = fdopen(fd, mode);
368 if (f == NULL) {
369 error_setg_errno(&local_err, errno, "failed to associate "
370 "stdio stream with file descriptor %d, "
371 "file '%s' (mode: '%s')", fd, path, mode);
372 } else {
373 return f;
374 }
375 }
376
377 close(fd);
378 if (oflag & O_CREAT) {
379 unlink(path);
380 }
381 }
382 }
383
384 error_propagate(errp, local_err);
385 return NULL;
386 }
387
388 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
389 Error **errp)
390 {
391 FILE *fh;
392 Error *local_err = NULL;
393 int64_t handle;
394
395 if (!has_mode) {
396 mode = "r";
397 }
398 slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
399 fh = safe_open_or_create(path, mode, &local_err);
400 if (local_err != NULL) {
401 error_propagate(errp, local_err);
402 return -1;
403 }
404
405 /* set fd non-blocking to avoid common use cases (like reading from a
406 * named pipe) from hanging the agent
407 */
408 qemu_set_nonblock(fileno(fh));
409
410 handle = guest_file_handle_add(fh, errp);
411 if (handle < 0) {
412 fclose(fh);
413 return -1;
414 }
415
416 slog("guest-file-open, handle: %" PRId64, handle);
417 return handle;
418 }
419
420 void qmp_guest_file_close(int64_t handle, Error **errp)
421 {
422 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
423 int ret;
424
425 slog("guest-file-close called, handle: %" PRId64, handle);
426 if (!gfh) {
427 return;
428 }
429
430 ret = fclose(gfh->fh);
431 if (ret == EOF) {
432 error_setg_errno(errp, errno, "failed to close handle");
433 return;
434 }
435
436 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
437 g_free(gfh);
438 }
439
440 struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
441 int64_t count, Error **errp)
442 {
443 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
444 GuestFileRead *read_data = NULL;
445 guchar *buf;
446 FILE *fh;
447 size_t read_count;
448
449 if (!gfh) {
450 return NULL;
451 }
452
453 if (!has_count) {
454 count = QGA_READ_COUNT_DEFAULT;
455 } else if (count < 0) {
456 error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
457 count);
458 return NULL;
459 }
460
461 fh = gfh->fh;
462
463 /* explicitly flush when switching from writing to reading */
464 if (gfh->state == RW_STATE_WRITING) {
465 int ret = fflush(fh);
466 if (ret == EOF) {
467 error_setg_errno(errp, errno, "failed to flush file");
468 return NULL;
469 }
470 gfh->state = RW_STATE_NEW;
471 }
472
473 buf = g_malloc0(count+1);
474 read_count = fread(buf, 1, count, fh);
475 if (ferror(fh)) {
476 error_setg_errno(errp, errno, "failed to read file");
477 slog("guest-file-read failed, handle: %" PRId64, handle);
478 } else {
479 buf[read_count] = 0;
480 read_data = g_new0(GuestFileRead, 1);
481 read_data->count = read_count;
482 read_data->eof = feof(fh);
483 if (read_count) {
484 read_data->buf_b64 = g_base64_encode(buf, read_count);
485 }
486 gfh->state = RW_STATE_READING;
487 }
488 g_free(buf);
489 clearerr(fh);
490
491 return read_data;
492 }
493
494 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
495 bool has_count, int64_t count,
496 Error **errp)
497 {
498 GuestFileWrite *write_data = NULL;
499 guchar *buf;
500 gsize buf_len;
501 int write_count;
502 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
503 FILE *fh;
504
505 if (!gfh) {
506 return NULL;
507 }
508
509 fh = gfh->fh;
510
511 if (gfh->state == RW_STATE_READING) {
512 int ret = fseek(fh, 0, SEEK_CUR);
513 if (ret == -1) {
514 error_setg_errno(errp, errno, "failed to seek file");
515 return NULL;
516 }
517 gfh->state = RW_STATE_NEW;
518 }
519
520 buf = qbase64_decode(buf_b64, -1, &buf_len, errp);
521 if (!buf) {
522 return NULL;
523 }
524
525 if (!has_count) {
526 count = buf_len;
527 } else if (count < 0 || count > buf_len) {
528 error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
529 count);
530 g_free(buf);
531 return NULL;
532 }
533
534 write_count = fwrite(buf, 1, count, fh);
535 if (ferror(fh)) {
536 error_setg_errno(errp, errno, "failed to write to file");
537 slog("guest-file-write failed, handle: %" PRId64, handle);
538 } else {
539 write_data = g_new0(GuestFileWrite, 1);
540 write_data->count = write_count;
541 write_data->eof = feof(fh);
542 gfh->state = RW_STATE_WRITING;
543 }
544 g_free(buf);
545 clearerr(fh);
546
547 return write_data;
548 }
549
550 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
551 GuestFileWhence *whence_code,
552 Error **errp)
553 {
554 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
555 GuestFileSeek *seek_data = NULL;
556 FILE *fh;
557 int ret;
558 int whence;
559 Error *err = NULL;
560
561 if (!gfh) {
562 return NULL;
563 }
564
565 /* We stupidly exposed 'whence':'int' in our qapi */
566 whence = ga_parse_whence(whence_code, &err);
567 if (err) {
568 error_propagate(errp, err);
569 return NULL;
570 }
571
572 fh = gfh->fh;
573 ret = fseek(fh, offset, whence);
574 if (ret == -1) {
575 error_setg_errno(errp, errno, "failed to seek file");
576 if (errno == ESPIPE) {
577 /* file is non-seekable, stdio shouldn't be buffering anyways */
578 gfh->state = RW_STATE_NEW;
579 }
580 } else {
581 seek_data = g_new0(GuestFileSeek, 1);
582 seek_data->position = ftell(fh);
583 seek_data->eof = feof(fh);
584 gfh->state = RW_STATE_NEW;
585 }
586 clearerr(fh);
587
588 return seek_data;
589 }
590
591 void qmp_guest_file_flush(int64_t handle, Error **errp)
592 {
593 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
594 FILE *fh;
595 int ret;
596
597 if (!gfh) {
598 return;
599 }
600
601 fh = gfh->fh;
602 ret = fflush(fh);
603 if (ret == EOF) {
604 error_setg_errno(errp, errno, "failed to flush file");
605 } else {
606 gfh->state = RW_STATE_NEW;
607 }
608 }
609
610 /* linux-specific implementations. avoid this if at all possible. */
611 #if defined(__linux__)
612
613 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
614 typedef struct FsMount {
615 char *dirname;
616 char *devtype;
617 unsigned int devmajor, devminor;
618 QTAILQ_ENTRY(FsMount) next;
619 } FsMount;
620
621 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
622
623 static void free_fs_mount_list(FsMountList *mounts)
624 {
625 FsMount *mount, *temp;
626
627 if (!mounts) {
628 return;
629 }
630
631 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
632 QTAILQ_REMOVE(mounts, mount, next);
633 g_free(mount->dirname);
634 g_free(mount->devtype);
635 g_free(mount);
636 }
637 }
638
639 static int dev_major_minor(const char *devpath,
640 unsigned int *devmajor, unsigned int *devminor)
641 {
642 struct stat st;
643
644 *devmajor = 0;
645 *devminor = 0;
646
647 if (stat(devpath, &st) < 0) {
648 slog("failed to stat device file '%s': %s", devpath, strerror(errno));
649 return -1;
650 }
651 if (S_ISDIR(st.st_mode)) {
652 /* It is bind mount */
653 return -2;
654 }
655 if (S_ISBLK(st.st_mode)) {
656 *devmajor = major(st.st_rdev);
657 *devminor = minor(st.st_rdev);
658 return 0;
659 }
660 return -1;
661 }
662
663 /*
664 * Walk the mount table and build a list of local file systems
665 */
666 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
667 {
668 struct mntent *ment;
669 FsMount *mount;
670 char const *mtab = "/proc/self/mounts";
671 FILE *fp;
672 unsigned int devmajor, devminor;
673
674 fp = setmntent(mtab, "r");
675 if (!fp) {
676 error_setg(errp, "failed to open mtab file: '%s'", mtab);
677 return;
678 }
679
680 while ((ment = getmntent(fp))) {
681 /*
682 * An entry which device name doesn't start with a '/' is
683 * either a dummy file system or a network file system.
684 * Add special handling for smbfs and cifs as is done by
685 * coreutils as well.
686 */
687 if ((ment->mnt_fsname[0] != '/') ||
688 (strcmp(ment->mnt_type, "smbfs") == 0) ||
689 (strcmp(ment->mnt_type, "cifs") == 0)) {
690 continue;
691 }
692 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
693 /* Skip bind mounts */
694 continue;
695 }
696
697 mount = g_new0(FsMount, 1);
698 mount->dirname = g_strdup(ment->mnt_dir);
699 mount->devtype = g_strdup(ment->mnt_type);
700 mount->devmajor = devmajor;
701 mount->devminor = devminor;
702
703 QTAILQ_INSERT_TAIL(mounts, mount, next);
704 }
705
706 endmntent(fp);
707 }
708
709 static void decode_mntname(char *name, int len)
710 {
711 int i, j = 0;
712 for (i = 0; i <= len; i++) {
713 if (name[i] != '\\') {
714 name[j++] = name[i];
715 } else if (name[i + 1] == '\\') {
716 name[j++] = '\\';
717 i++;
718 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
719 name[i + 2] >= '0' && name[i + 2] <= '7' &&
720 name[i + 3] >= '0' && name[i + 3] <= '7') {
721 name[j++] = (name[i + 1] - '0') * 64 +
722 (name[i + 2] - '0') * 8 +
723 (name[i + 3] - '0');
724 i += 3;
725 } else {
726 name[j++] = name[i];
727 }
728 }
729 }
730
731 static void build_fs_mount_list(FsMountList *mounts, Error **errp)
732 {
733 FsMount *mount;
734 char const *mountinfo = "/proc/self/mountinfo";
735 FILE *fp;
736 char *line = NULL, *dash;
737 size_t n;
738 char check;
739 unsigned int devmajor, devminor;
740 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
741
742 fp = fopen(mountinfo, "r");
743 if (!fp) {
744 build_fs_mount_list_from_mtab(mounts, errp);
745 return;
746 }
747
748 while (getline(&line, &n, fp) != -1) {
749 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
750 &devmajor, &devminor, &dir_s, &dir_e, &check);
751 if (ret < 3) {
752 continue;
753 }
754 dash = strstr(line + dir_e, " - ");
755 if (!dash) {
756 continue;
757 }
758 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
759 &type_s, &type_e, &dev_s, &dev_e, &check);
760 if (ret < 1) {
761 continue;
762 }
763 line[dir_e] = 0;
764 dash[type_e] = 0;
765 dash[dev_e] = 0;
766 decode_mntname(line + dir_s, dir_e - dir_s);
767 decode_mntname(dash + dev_s, dev_e - dev_s);
768 if (devmajor == 0) {
769 /* btrfs reports major number = 0 */
770 if (strcmp("btrfs", dash + type_s) != 0 ||
771 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
772 continue;
773 }
774 }
775
776 mount = g_new0(FsMount, 1);
777 mount->dirname = g_strdup(line + dir_s);
778 mount->devtype = g_strdup(dash + type_s);
779 mount->devmajor = devmajor;
780 mount->devminor = devminor;
781
782 QTAILQ_INSERT_TAIL(mounts, mount, next);
783 }
784 free(line);
785
786 fclose(fp);
787 }
788 #endif
789
790 #if defined(CONFIG_FSFREEZE)
791
792 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
793 {
794 char *path;
795 char *dpath;
796 char *driver = NULL;
797 char buf[PATH_MAX];
798 ssize_t len;
799
800 path = g_strndup(syspath, pathlen);
801 dpath = g_strdup_printf("%s/driver", path);
802 len = readlink(dpath, buf, sizeof(buf) - 1);
803 if (len != -1) {
804 buf[len] = 0;
805 driver = g_strdup(basename(buf));
806 }
807 g_free(dpath);
808 g_free(path);
809 return driver;
810 }
811
812 static int compare_uint(const void *_a, const void *_b)
813 {
814 unsigned int a = *(unsigned int *)_a;
815 unsigned int b = *(unsigned int *)_b;
816
817 return a < b ? -1 : a > b ? 1 : 0;
818 }
819
820 /* Walk the specified sysfs and build a sorted list of host or ata numbers */
821 static int build_hosts(char const *syspath, char const *host, bool ata,
822 unsigned int *hosts, int hosts_max, Error **errp)
823 {
824 char *path;
825 DIR *dir;
826 struct dirent *entry;
827 int i = 0;
828
829 path = g_strndup(syspath, host - syspath);
830 dir = opendir(path);
831 if (!dir) {
832 error_setg_errno(errp, errno, "opendir(\"%s\")", path);
833 g_free(path);
834 return -1;
835 }
836
837 while (i < hosts_max) {
838 entry = readdir(dir);
839 if (!entry) {
840 break;
841 }
842 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
843 ++i;
844 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
845 ++i;
846 }
847 }
848
849 qsort(hosts, i, sizeof(hosts[0]), compare_uint);
850
851 g_free(path);
852 closedir(dir);
853 return i;
854 }
855
856 /* Store disk device info specified by @sysfs into @fs */
857 static void build_guest_fsinfo_for_real_device(char const *syspath,
858 GuestFilesystemInfo *fs,
859 Error **errp)
860 {
861 unsigned int pci[4], host, hosts[8], tgt[3];
862 int i, nhosts = 0, pcilen;
863 GuestDiskAddress *disk;
864 GuestPCIAddress *pciaddr;
865 GuestDiskAddressList *list = NULL;
866 bool has_ata = false, has_host = false, has_tgt = false;
867 char *p, *q, *driver = NULL;
868
869 p = strstr(syspath, "/devices/pci");
870 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
871 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
872 g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
873 return;
874 }
875
876 driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
877 if (!driver) {
878 goto cleanup;
879 }
880
881 p = strstr(syspath, "/target");
882 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
883 tgt, tgt + 1, tgt + 2) == 3) {
884 has_tgt = true;
885 }
886
887 p = strstr(syspath, "/ata");
888 if (p) {
889 q = p + 4;
890 has_ata = true;
891 } else {
892 p = strstr(syspath, "/host");
893 q = p + 5;
894 }
895 if (p && sscanf(q, "%u", &host) == 1) {
896 has_host = true;
897 nhosts = build_hosts(syspath, p, has_ata, hosts,
898 sizeof(hosts) / sizeof(hosts[0]), errp);
899 if (nhosts < 0) {
900 goto cleanup;
901 }
902 }
903
904 pciaddr = g_malloc0(sizeof(*pciaddr));
905 pciaddr->domain = pci[0];
906 pciaddr->bus = pci[1];
907 pciaddr->slot = pci[2];
908 pciaddr->function = pci[3];
909
910 disk = g_malloc0(sizeof(*disk));
911 disk->pci_controller = pciaddr;
912
913 list = g_malloc0(sizeof(*list));
914 list->value = disk;
915
916 if (strcmp(driver, "ata_piix") == 0) {
917 /* a host per ide bus, target*:0:<unit>:0 */
918 if (!has_host || !has_tgt) {
919 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
920 goto cleanup;
921 }
922 for (i = 0; i < nhosts; i++) {
923 if (host == hosts[i]) {
924 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
925 disk->bus = i;
926 disk->unit = tgt[1];
927 break;
928 }
929 }
930 if (i >= nhosts) {
931 g_debug("no host for '%s' (driver '%s')", syspath, driver);
932 goto cleanup;
933 }
934 } else if (strcmp(driver, "sym53c8xx") == 0) {
935 /* scsi(LSI Logic): target*:0:<unit>:0 */
936 if (!has_tgt) {
937 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
938 goto cleanup;
939 }
940 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
941 disk->unit = tgt[1];
942 } else if (strcmp(driver, "virtio-pci") == 0) {
943 if (has_tgt) {
944 /* virtio-scsi: target*:0:0:<unit> */
945 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
946 disk->unit = tgt[2];
947 } else {
948 /* virtio-blk: 1 disk per 1 device */
949 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
950 }
951 } else if (strcmp(driver, "ahci") == 0) {
952 /* ahci: 1 host per 1 unit */
953 if (!has_host || !has_tgt) {
954 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
955 goto cleanup;
956 }
957 for (i = 0; i < nhosts; i++) {
958 if (host == hosts[i]) {
959 disk->unit = i;
960 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
961 break;
962 }
963 }
964 if (i >= nhosts) {
965 g_debug("no host for '%s' (driver '%s')", syspath, driver);
966 goto cleanup;
967 }
968 } else {
969 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
970 goto cleanup;
971 }
972
973 list->next = fs->disk;
974 fs->disk = list;
975 g_free(driver);
976 return;
977
978 cleanup:
979 if (list) {
980 qapi_free_GuestDiskAddressList(list);
981 }
982 g_free(driver);
983 }
984
985 static void build_guest_fsinfo_for_device(char const *devpath,
986 GuestFilesystemInfo *fs,
987 Error **errp);
988
989 /* Store a list of slave devices of virtual volume specified by @syspath into
990 * @fs */
991 static void build_guest_fsinfo_for_virtual_device(char const *syspath,
992 GuestFilesystemInfo *fs,
993 Error **errp)
994 {
995 DIR *dir;
996 char *dirpath;
997 struct dirent *entry;
998
999 dirpath = g_strdup_printf("%s/slaves", syspath);
1000 dir = opendir(dirpath);
1001 if (!dir) {
1002 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
1003 g_free(dirpath);
1004 return;
1005 }
1006
1007 for (;;) {
1008 errno = 0;
1009 entry = readdir(dir);
1010 if (entry == NULL) {
1011 if (errno) {
1012 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
1013 }
1014 break;
1015 }
1016
1017 if (entry->d_type == DT_LNK) {
1018 char *path;
1019
1020 g_debug(" slave device '%s'", entry->d_name);
1021 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
1022 build_guest_fsinfo_for_device(path, fs, errp);
1023 g_free(path);
1024
1025 if (*errp) {
1026 break;
1027 }
1028 }
1029 }
1030
1031 g_free(dirpath);
1032 closedir(dir);
1033 }
1034
1035 /* Dispatch to functions for virtual/real device */
1036 static void build_guest_fsinfo_for_device(char const *devpath,
1037 GuestFilesystemInfo *fs,
1038 Error **errp)
1039 {
1040 char *syspath = realpath(devpath, NULL);
1041
1042 if (!syspath) {
1043 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1044 return;
1045 }
1046
1047 if (!fs->name) {
1048 fs->name = g_strdup(basename(syspath));
1049 }
1050
1051 g_debug(" parse sysfs path '%s'", syspath);
1052
1053 if (strstr(syspath, "/devices/virtual/block/")) {
1054 build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
1055 } else {
1056 build_guest_fsinfo_for_real_device(syspath, fs, errp);
1057 }
1058
1059 free(syspath);
1060 }
1061
1062 /* Return a list of the disk device(s)' info which @mount lies on */
1063 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
1064 Error **errp)
1065 {
1066 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
1067 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
1068 mount->devmajor, mount->devminor);
1069
1070 fs->mountpoint = g_strdup(mount->dirname);
1071 fs->type = g_strdup(mount->devtype);
1072 build_guest_fsinfo_for_device(devpath, fs, errp);
1073
1074 g_free(devpath);
1075 return fs;
1076 }
1077
1078 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
1079 {
1080 FsMountList mounts;
1081 struct FsMount *mount;
1082 GuestFilesystemInfoList *new, *ret = NULL;
1083 Error *local_err = NULL;
1084
1085 QTAILQ_INIT(&mounts);
1086 build_fs_mount_list(&mounts, &local_err);
1087 if (local_err) {
1088 error_propagate(errp, local_err);
1089 return NULL;
1090 }
1091
1092 QTAILQ_FOREACH(mount, &mounts, next) {
1093 g_debug("Building guest fsinfo for '%s'", mount->dirname);
1094
1095 new = g_malloc0(sizeof(*ret));
1096 new->value = build_guest_fsinfo(mount, &local_err);
1097 new->next = ret;
1098 ret = new;
1099 if (local_err) {
1100 error_propagate(errp, local_err);
1101 qapi_free_GuestFilesystemInfoList(ret);
1102 ret = NULL;
1103 break;
1104 }
1105 }
1106
1107 free_fs_mount_list(&mounts);
1108 return ret;
1109 }
1110
1111
1112 typedef enum {
1113 FSFREEZE_HOOK_THAW = 0,
1114 FSFREEZE_HOOK_FREEZE,
1115 } FsfreezeHookArg;
1116
1117 static const char *fsfreeze_hook_arg_string[] = {
1118 "thaw",
1119 "freeze",
1120 };
1121
1122 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
1123 {
1124 int status;
1125 pid_t pid;
1126 const char *hook;
1127 const char *arg_str = fsfreeze_hook_arg_string[arg];
1128 Error *local_err = NULL;
1129
1130 hook = ga_fsfreeze_hook(ga_state);
1131 if (!hook) {
1132 return;
1133 }
1134 if (access(hook, X_OK) != 0) {
1135 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
1136 return;
1137 }
1138
1139 slog("executing fsfreeze hook with arg '%s'", arg_str);
1140 pid = fork();
1141 if (pid == 0) {
1142 setsid();
1143 reopen_fd_to_null(0);
1144 reopen_fd_to_null(1);
1145 reopen_fd_to_null(2);
1146
1147 execle(hook, hook, arg_str, NULL, environ);
1148 _exit(EXIT_FAILURE);
1149 } else if (pid < 0) {
1150 error_setg_errno(errp, errno, "failed to create child process");
1151 return;
1152 }
1153
1154 ga_wait_child(pid, &status, &local_err);
1155 if (local_err) {
1156 error_propagate(errp, local_err);
1157 return;
1158 }
1159
1160 if (!WIFEXITED(status)) {
1161 error_setg(errp, "fsfreeze hook has terminated abnormally");
1162 return;
1163 }
1164
1165 status = WEXITSTATUS(status);
1166 if (status) {
1167 error_setg(errp, "fsfreeze hook has failed with status %d", status);
1168 return;
1169 }
1170 }
1171
1172 /*
1173 * Return status of freeze/thaw
1174 */
1175 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1176 {
1177 if (ga_is_frozen(ga_state)) {
1178 return GUEST_FSFREEZE_STATUS_FROZEN;
1179 }
1180
1181 return GUEST_FSFREEZE_STATUS_THAWED;
1182 }
1183
1184 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1185 {
1186 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
1187 }
1188
1189 /*
1190 * Walk list of mounted file systems in the guest, and freeze the ones which
1191 * are real local file systems.
1192 */
1193 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1194 strList *mountpoints,
1195 Error **errp)
1196 {
1197 int ret = 0, i = 0;
1198 strList *list;
1199 FsMountList mounts;
1200 struct FsMount *mount;
1201 Error *local_err = NULL;
1202 int fd;
1203
1204 slog("guest-fsfreeze called");
1205
1206 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
1207 if (local_err) {
1208 error_propagate(errp, local_err);
1209 return -1;
1210 }
1211
1212 QTAILQ_INIT(&mounts);
1213 build_fs_mount_list(&mounts, &local_err);
1214 if (local_err) {
1215 error_propagate(errp, local_err);
1216 return -1;
1217 }
1218
1219 /* cannot risk guest agent blocking itself on a write in this state */
1220 ga_set_frozen(ga_state);
1221
1222 QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) {
1223 /* To issue fsfreeze in the reverse order of mounts, check if the
1224 * mount is listed in the list here */
1225 if (has_mountpoints) {
1226 for (list = mountpoints; list; list = list->next) {
1227 if (strcmp(list->value, mount->dirname) == 0) {
1228 break;
1229 }
1230 }
1231 if (!list) {
1232 continue;
1233 }
1234 }
1235
1236 fd = qemu_open(mount->dirname, O_RDONLY);
1237 if (fd == -1) {
1238 error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
1239 goto error;
1240 }
1241
1242 /* we try to cull filesystems we know won't work in advance, but other
1243 * filesystems may not implement fsfreeze for less obvious reasons.
1244 * these will report EOPNOTSUPP. we simply ignore these when tallying
1245 * the number of frozen filesystems.
1246 * if a filesystem is mounted more than once (aka bind mount) a
1247 * consecutive attempt to freeze an already frozen filesystem will
1248 * return EBUSY.
1249 *
1250 * any other error means a failure to freeze a filesystem we
1251 * expect to be freezable, so return an error in those cases
1252 * and return system to thawed state.
1253 */
1254 ret = ioctl(fd, FIFREEZE);
1255 if (ret == -1) {
1256 if (errno != EOPNOTSUPP && errno != EBUSY) {
1257 error_setg_errno(errp, errno, "failed to freeze %s",
1258 mount->dirname);
1259 close(fd);
1260 goto error;
1261 }
1262 } else {
1263 i++;
1264 }
1265 close(fd);
1266 }
1267
1268 free_fs_mount_list(&mounts);
1269 return i;
1270
1271 error:
1272 free_fs_mount_list(&mounts);
1273 qmp_guest_fsfreeze_thaw(NULL);
1274 return 0;
1275 }
1276
1277 /*
1278 * Walk list of frozen file systems in the guest, and thaw them.
1279 */
1280 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1281 {
1282 int ret;
1283 FsMountList mounts;
1284 FsMount *mount;
1285 int fd, i = 0, logged;
1286 Error *local_err = NULL;
1287
1288 QTAILQ_INIT(&mounts);
1289 build_fs_mount_list(&mounts, &local_err);
1290 if (local_err) {
1291 error_propagate(errp, local_err);
1292 return 0;
1293 }
1294
1295 QTAILQ_FOREACH(mount, &mounts, next) {
1296 logged = false;
1297 fd = qemu_open(mount->dirname, O_RDONLY);
1298 if (fd == -1) {
1299 continue;
1300 }
1301 /* we have no way of knowing whether a filesystem was actually unfrozen
1302 * as a result of a successful call to FITHAW, only that if an error
1303 * was returned the filesystem was *not* unfrozen by that particular
1304 * call.
1305 *
1306 * since multiple preceding FIFREEZEs require multiple calls to FITHAW
1307 * to unfreeze, continuing issuing FITHAW until an error is returned,
1308 * in which case either the filesystem is in an unfreezable state, or,
1309 * more likely, it was thawed previously (and remains so afterward).
1310 *
1311 * also, since the most recent successful call is the one that did
1312 * the actual unfreeze, we can use this to provide an accurate count
1313 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
1314 * may * be useful for determining whether a filesystem was unfrozen
1315 * during the freeze/thaw phase by a process other than qemu-ga.
1316 */
1317 do {
1318 ret = ioctl(fd, FITHAW);
1319 if (ret == 0 && !logged) {
1320 i++;
1321 logged = true;
1322 }
1323 } while (ret == 0);
1324 close(fd);
1325 }
1326
1327 ga_unset_frozen(ga_state);
1328 free_fs_mount_list(&mounts);
1329
1330 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
1331
1332 return i;
1333 }
1334
1335 static void guest_fsfreeze_cleanup(void)
1336 {
1337 Error *err = NULL;
1338
1339 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
1340 qmp_guest_fsfreeze_thaw(&err);
1341 if (err) {
1342 slog("failed to clean up frozen filesystems: %s",
1343 error_get_pretty(err));
1344 error_free(err);
1345 }
1346 }
1347 }
1348 #endif /* CONFIG_FSFREEZE */
1349
1350 #if defined(CONFIG_FSTRIM)
1351 /*
1352 * Walk list of mounted file systems in the guest, and trim them.
1353 */
1354 GuestFilesystemTrimResponse *
1355 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1356 {
1357 GuestFilesystemTrimResponse *response;
1358 GuestFilesystemTrimResultList *list;
1359 GuestFilesystemTrimResult *result;
1360 int ret = 0;
1361 FsMountList mounts;
1362 struct FsMount *mount;
1363 int fd;
1364 Error *local_err = NULL;
1365 struct fstrim_range r;
1366
1367 slog("guest-fstrim called");
1368
1369 QTAILQ_INIT(&mounts);
1370 build_fs_mount_list(&mounts, &local_err);
1371 if (local_err) {
1372 error_propagate(errp, local_err);
1373 return NULL;
1374 }
1375
1376 response = g_malloc0(sizeof(*response));
1377
1378 QTAILQ_FOREACH(mount, &mounts, next) {
1379 result = g_malloc0(sizeof(*result));
1380 result->path = g_strdup(mount->dirname);
1381
1382 list = g_malloc0(sizeof(*list));
1383 list->value = result;
1384 list->next = response->paths;
1385 response->paths = list;
1386
1387 fd = qemu_open(mount->dirname, O_RDONLY);
1388 if (fd == -1) {
1389 result->error = g_strdup_printf("failed to open: %s",
1390 strerror(errno));
1391 result->has_error = true;
1392 continue;
1393 }
1394
1395 /* We try to cull filesystems we know won't work in advance, but other
1396 * filesystems may not implement fstrim for less obvious reasons.
1397 * These will report EOPNOTSUPP; while in some other cases ENOTTY
1398 * will be reported (e.g. CD-ROMs).
1399 * Any other error means an unexpected error.
1400 */
1401 r.start = 0;
1402 r.len = -1;
1403 r.minlen = has_minimum ? minimum : 0;
1404 ret = ioctl(fd, FITRIM, &r);
1405 if (ret == -1) {
1406 result->has_error = true;
1407 if (errno == ENOTTY || errno == EOPNOTSUPP) {
1408 result->error = g_strdup("trim not supported");
1409 } else {
1410 result->error = g_strdup_printf("failed to trim: %s",
1411 strerror(errno));
1412 }
1413 close(fd);
1414 continue;
1415 }
1416
1417 result->has_minimum = true;
1418 result->minimum = r.minlen;
1419 result->has_trimmed = true;
1420 result->trimmed = r.len;
1421 close(fd);
1422 }
1423
1424 free_fs_mount_list(&mounts);
1425 return response;
1426 }
1427 #endif /* CONFIG_FSTRIM */
1428
1429
1430 #define LINUX_SYS_STATE_FILE "/sys/power/state"
1431 #define SUSPEND_SUPPORTED 0
1432 #define SUSPEND_NOT_SUPPORTED 1
1433
1434 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
1435 const char *sysfile_str, Error **errp)
1436 {
1437 Error *local_err = NULL;
1438 char *pmutils_path;
1439 pid_t pid;
1440 int status;
1441
1442 pmutils_path = g_find_program_in_path(pmutils_bin);
1443
1444 pid = fork();
1445 if (!pid) {
1446 char buf[32]; /* hopefully big enough */
1447 ssize_t ret;
1448 int fd;
1449
1450 setsid();
1451 reopen_fd_to_null(0);
1452 reopen_fd_to_null(1);
1453 reopen_fd_to_null(2);
1454
1455 if (pmutils_path) {
1456 execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
1457 }
1458
1459 /*
1460 * If we get here either pm-utils is not installed or execle() has
1461 * failed. Let's try the manual method if the caller wants it.
1462 */
1463
1464 if (!sysfile_str) {
1465 _exit(SUSPEND_NOT_SUPPORTED);
1466 }
1467
1468 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
1469 if (fd < 0) {
1470 _exit(SUSPEND_NOT_SUPPORTED);
1471 }
1472
1473 ret = read(fd, buf, sizeof(buf)-1);
1474 if (ret <= 0) {
1475 _exit(SUSPEND_NOT_SUPPORTED);
1476 }
1477 buf[ret] = '\0';
1478
1479 if (strstr(buf, sysfile_str)) {
1480 _exit(SUSPEND_SUPPORTED);
1481 }
1482
1483 _exit(SUSPEND_NOT_SUPPORTED);
1484 } else if (pid < 0) {
1485 error_setg_errno(errp, errno, "failed to create child process");
1486 goto out;
1487 }
1488
1489 ga_wait_child(pid, &status, &local_err);
1490 if (local_err) {
1491 error_propagate(errp, local_err);
1492 goto out;
1493 }
1494
1495 if (!WIFEXITED(status)) {
1496 error_setg(errp, "child process has terminated abnormally");
1497 goto out;
1498 }
1499
1500 switch (WEXITSTATUS(status)) {
1501 case SUSPEND_SUPPORTED:
1502 goto out;
1503 case SUSPEND_NOT_SUPPORTED:
1504 error_setg(errp,
1505 "the requested suspend mode is not supported by the guest");
1506 goto out;
1507 default:
1508 error_setg(errp,
1509 "the helper program '%s' returned an unexpected exit status"
1510 " code (%d)", pmutils_path, WEXITSTATUS(status));
1511 goto out;
1512 }
1513
1514 out:
1515 g_free(pmutils_path);
1516 }
1517
1518 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
1519 Error **errp)
1520 {
1521 Error *local_err = NULL;
1522 char *pmutils_path;
1523 pid_t pid;
1524 int status;
1525
1526 pmutils_path = g_find_program_in_path(pmutils_bin);
1527
1528 pid = fork();
1529 if (pid == 0) {
1530 /* child */
1531 int fd;
1532
1533 setsid();
1534 reopen_fd_to_null(0);
1535 reopen_fd_to_null(1);
1536 reopen_fd_to_null(2);
1537
1538 if (pmutils_path) {
1539 execle(pmutils_path, pmutils_bin, NULL, environ);
1540 }
1541
1542 /*
1543 * If we get here either pm-utils is not installed or execle() has
1544 * failed. Let's try the manual method if the caller wants it.
1545 */
1546
1547 if (!sysfile_str) {
1548 _exit(EXIT_FAILURE);
1549 }
1550
1551 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
1552 if (fd < 0) {
1553 _exit(EXIT_FAILURE);
1554 }
1555
1556 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
1557 _exit(EXIT_FAILURE);
1558 }
1559
1560 _exit(EXIT_SUCCESS);
1561 } else if (pid < 0) {
1562 error_setg_errno(errp, errno, "failed to create child process");
1563 goto out;
1564 }
1565
1566 ga_wait_child(pid, &status, &local_err);
1567 if (local_err) {
1568 error_propagate(errp, local_err);
1569 goto out;
1570 }
1571
1572 if (!WIFEXITED(status)) {
1573 error_setg(errp, "child process has terminated abnormally");
1574 goto out;
1575 }
1576
1577 if (WEXITSTATUS(status)) {
1578 error_setg(errp, "child process has failed to suspend");
1579 goto out;
1580 }
1581
1582 out:
1583 g_free(pmutils_path);
1584 }
1585
1586 void qmp_guest_suspend_disk(Error **errp)
1587 {
1588 Error *local_err = NULL;
1589
1590 bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err);
1591 if (local_err) {
1592 error_propagate(errp, local_err);
1593 return;
1594 }
1595
1596 guest_suspend("pm-hibernate", "disk", errp);
1597 }
1598
1599 void qmp_guest_suspend_ram(Error **errp)
1600 {
1601 Error *local_err = NULL;
1602
1603 bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err);
1604 if (local_err) {
1605 error_propagate(errp, local_err);
1606 return;
1607 }
1608
1609 guest_suspend("pm-suspend", "mem", errp);
1610 }
1611
1612 void qmp_guest_suspend_hybrid(Error **errp)
1613 {
1614 Error *local_err = NULL;
1615
1616 bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL,
1617 &local_err);
1618 if (local_err) {
1619 error_propagate(errp, local_err);
1620 return;
1621 }
1622
1623 guest_suspend("pm-suspend-hybrid", NULL, errp);
1624 }
1625
1626 static GuestNetworkInterfaceList *
1627 guest_find_interface(GuestNetworkInterfaceList *head,
1628 const char *name)
1629 {
1630 for (; head; head = head->next) {
1631 if (strcmp(head->value->name, name) == 0) {
1632 break;
1633 }
1634 }
1635
1636 return head;
1637 }
1638
1639 /*
1640 * Build information about guest interfaces
1641 */
1642 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
1643 {
1644 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
1645 struct ifaddrs *ifap, *ifa;
1646
1647 if (getifaddrs(&ifap) < 0) {
1648 error_setg_errno(errp, errno, "getifaddrs failed");
1649 goto error;
1650 }
1651
1652 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1653 GuestNetworkInterfaceList *info;
1654 GuestIpAddressList **address_list = NULL, *address_item = NULL;
1655 char addr4[INET_ADDRSTRLEN];
1656 char addr6[INET6_ADDRSTRLEN];
1657 int sock;
1658 struct ifreq ifr;
1659 unsigned char *mac_addr;
1660 void *p;
1661
1662 g_debug("Processing %s interface", ifa->ifa_name);
1663
1664 info = guest_find_interface(head, ifa->ifa_name);
1665
1666 if (!info) {
1667 info = g_malloc0(sizeof(*info));
1668 info->value = g_malloc0(sizeof(*info->value));
1669 info->value->name = g_strdup(ifa->ifa_name);
1670
1671 if (!cur_item) {
1672 head = cur_item = info;
1673 } else {
1674 cur_item->next = info;
1675 cur_item = info;
1676 }
1677 }
1678
1679 if (!info->value->has_hardware_address &&
1680 ifa->ifa_flags & SIOCGIFHWADDR) {
1681 /* we haven't obtained HW address yet */
1682 sock = socket(PF_INET, SOCK_STREAM, 0);
1683 if (sock == -1) {
1684 error_setg_errno(errp, errno, "failed to create socket");
1685 goto error;
1686 }
1687
1688 memset(&ifr, 0, sizeof(ifr));
1689 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
1690 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
1691 error_setg_errno(errp, errno,
1692 "failed to get MAC address of %s",
1693 ifa->ifa_name);
1694 close(sock);
1695 goto error;
1696 }
1697
1698 close(sock);
1699 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
1700
1701 info->value->hardware_address =
1702 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
1703 (int) mac_addr[0], (int) mac_addr[1],
1704 (int) mac_addr[2], (int) mac_addr[3],
1705 (int) mac_addr[4], (int) mac_addr[5]);
1706
1707 info->value->has_hardware_address = true;
1708 }
1709
1710 if (ifa->ifa_addr &&
1711 ifa->ifa_addr->sa_family == AF_INET) {
1712 /* interface with IPv4 address */
1713 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
1714 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
1715 error_setg_errno(errp, errno, "inet_ntop failed");
1716 goto error;
1717 }
1718
1719 address_item = g_malloc0(sizeof(*address_item));
1720 address_item->value = g_malloc0(sizeof(*address_item->value));
1721 address_item->value->ip_address = g_strdup(addr4);
1722 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
1723
1724 if (ifa->ifa_netmask) {
1725 /* Count the number of set bits in netmask.
1726 * This is safe as '1' and '0' cannot be shuffled in netmask. */
1727 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
1728 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
1729 }
1730 } else if (ifa->ifa_addr &&
1731 ifa->ifa_addr->sa_family == AF_INET6) {
1732 /* interface with IPv6 address */
1733 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
1734 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
1735 error_setg_errno(errp, errno, "inet_ntop failed");
1736 goto error;
1737 }
1738
1739 address_item = g_malloc0(sizeof(*address_item));
1740 address_item->value = g_malloc0(sizeof(*address_item->value));
1741 address_item->value->ip_address = g_strdup(addr6);
1742 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
1743
1744 if (ifa->ifa_netmask) {
1745 /* Count the number of set bits in netmask.
1746 * This is safe as '1' and '0' cannot be shuffled in netmask. */
1747 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
1748 address_item->value->prefix =
1749 ctpop32(((uint32_t *) p)[0]) +
1750 ctpop32(((uint32_t *) p)[1]) +
1751 ctpop32(((uint32_t *) p)[2]) +
1752 ctpop32(((uint32_t *) p)[3]);
1753 }
1754 }
1755
1756 if (!address_item) {
1757 continue;
1758 }
1759
1760 address_list = &info->value->ip_addresses;
1761
1762 while (*address_list && (*address_list)->next) {
1763 address_list = &(*address_list)->next;
1764 }
1765
1766 if (!*address_list) {
1767 *address_list = address_item;
1768 } else {
1769 (*address_list)->next = address_item;
1770 }
1771
1772 info->value->has_ip_addresses = true;
1773
1774
1775 }
1776
1777 freeifaddrs(ifap);
1778 return head;
1779
1780 error:
1781 freeifaddrs(ifap);
1782 qapi_free_GuestNetworkInterfaceList(head);
1783 return NULL;
1784 }
1785
1786 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
1787
1788 static long sysconf_exact(int name, const char *name_str, Error **errp)
1789 {
1790 long ret;
1791
1792 errno = 0;
1793 ret = sysconf(name);
1794 if (ret == -1) {
1795 if (errno == 0) {
1796 error_setg(errp, "sysconf(%s): value indefinite", name_str);
1797 } else {
1798 error_setg_errno(errp, errno, "sysconf(%s)", name_str);
1799 }
1800 }
1801 return ret;
1802 }
1803
1804 /* Transfer online/offline status between @vcpu and the guest system.
1805 *
1806 * On input either @errp or *@errp must be NULL.
1807 *
1808 * In system-to-@vcpu direction, the following @vcpu fields are accessed:
1809 * - R: vcpu->logical_id
1810 * - W: vcpu->online
1811 * - W: vcpu->can_offline
1812 *
1813 * In @vcpu-to-system direction, the following @vcpu fields are accessed:
1814 * - R: vcpu->logical_id
1815 * - R: vcpu->online
1816 *
1817 * Written members remain unmodified on error.
1818 */
1819 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
1820 Error **errp)
1821 {
1822 char *dirpath;
1823 int dirfd;
1824
1825 dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
1826 vcpu->logical_id);
1827 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
1828 if (dirfd == -1) {
1829 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
1830 } else {
1831 static const char fn[] = "online";
1832 int fd;
1833 int res;
1834
1835 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
1836 if (fd == -1) {
1837 if (errno != ENOENT) {
1838 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
1839 } else if (sys2vcpu) {
1840 vcpu->online = true;
1841 vcpu->can_offline = false;
1842 } else if (!vcpu->online) {
1843 error_setg(errp, "logical processor #%" PRId64 " can't be "
1844 "offlined", vcpu->logical_id);
1845 } /* otherwise pretend successful re-onlining */
1846 } else {
1847 unsigned char status;
1848
1849 res = pread(fd, &status, 1, 0);
1850 if (res == -1) {
1851 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
1852 } else if (res == 0) {
1853 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
1854 fn);
1855 } else if (sys2vcpu) {
1856 vcpu->online = (status != '0');
1857 vcpu->can_offline = true;
1858 } else if (vcpu->online != (status != '0')) {
1859 status = '0' + vcpu->online;
1860 if (pwrite(fd, &status, 1, 0) == -1) {
1861 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
1862 fn);
1863 }
1864 } /* otherwise pretend successful re-(on|off)-lining */
1865
1866 res = close(fd);
1867 g_assert(res == 0);
1868 }
1869
1870 res = close(dirfd);
1871 g_assert(res == 0);
1872 }
1873
1874 g_free(dirpath);
1875 }
1876
1877 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
1878 {
1879 int64_t current;
1880 GuestLogicalProcessorList *head, **link;
1881 long sc_max;
1882 Error *local_err = NULL;
1883
1884 current = 0;
1885 head = NULL;
1886 link = &head;
1887 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
1888
1889 while (local_err == NULL && current < sc_max) {
1890 GuestLogicalProcessor *vcpu;
1891 GuestLogicalProcessorList *entry;
1892
1893 vcpu = g_malloc0(sizeof *vcpu);
1894 vcpu->logical_id = current++;
1895 vcpu->has_can_offline = true; /* lolspeak ftw */
1896 transfer_vcpu(vcpu, true, &local_err);
1897
1898 entry = g_malloc0(sizeof *entry);
1899 entry->value = vcpu;
1900
1901 *link = entry;
1902 link = &entry->next;
1903 }
1904
1905 if (local_err == NULL) {
1906 /* there's no guest with zero VCPUs */
1907 g_assert(head != NULL);
1908 return head;
1909 }
1910
1911 qapi_free_GuestLogicalProcessorList(head);
1912 error_propagate(errp, local_err);
1913 return NULL;
1914 }
1915
1916 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
1917 {
1918 int64_t processed;
1919 Error *local_err = NULL;
1920
1921 processed = 0;
1922 while (vcpus != NULL) {
1923 transfer_vcpu(vcpus->value, false, &local_err);
1924 if (local_err != NULL) {
1925 break;
1926 }
1927 ++processed;
1928 vcpus = vcpus->next;
1929 }
1930
1931 if (local_err != NULL) {
1932 if (processed == 0) {
1933 error_propagate(errp, local_err);
1934 } else {
1935 error_free(local_err);
1936 }
1937 }
1938
1939 return processed;
1940 }
1941
1942 void qmp_guest_set_user_password(const char *username,
1943 const char *password,
1944 bool crypted,
1945 Error **errp)
1946 {
1947 Error *local_err = NULL;
1948 char *passwd_path = NULL;
1949 pid_t pid;
1950 int status;
1951 int datafd[2] = { -1, -1 };
1952 char *rawpasswddata = NULL;
1953 size_t rawpasswdlen;
1954 char *chpasswddata = NULL;
1955 size_t chpasswdlen;
1956
1957 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp);
1958 if (!rawpasswddata) {
1959 return;
1960 }
1961 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
1962 rawpasswddata[rawpasswdlen] = '\0';
1963
1964 if (strchr(rawpasswddata, '\n')) {
1965 error_setg(errp, "forbidden characters in raw password");
1966 goto out;
1967 }
1968
1969 if (strchr(username, '\n') ||
1970 strchr(username, ':')) {
1971 error_setg(errp, "forbidden characters in username");
1972 goto out;
1973 }
1974
1975 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
1976 chpasswdlen = strlen(chpasswddata);
1977
1978 passwd_path = g_find_program_in_path("chpasswd");
1979
1980 if (!passwd_path) {
1981 error_setg(errp, "cannot find 'passwd' program in PATH");
1982 goto out;
1983 }
1984
1985 if (pipe(datafd) < 0) {
1986 error_setg(errp, "cannot create pipe FDs");
1987 goto out;
1988 }
1989
1990 pid = fork();
1991 if (pid == 0) {
1992 close(datafd[1]);
1993 /* child */
1994 setsid();
1995 dup2(datafd[0], 0);
1996 reopen_fd_to_null(1);
1997 reopen_fd_to_null(2);
1998
1999 if (crypted) {
2000 execle(passwd_path, "chpasswd", "-e", NULL, environ);
2001 } else {
2002 execle(passwd_path, "chpasswd", NULL, environ);
2003 }
2004 _exit(EXIT_FAILURE);
2005 } else if (pid < 0) {
2006 error_setg_errno(errp, errno, "failed to create child process");
2007 goto out;
2008 }
2009 close(datafd[0]);
2010 datafd[0] = -1;
2011
2012 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
2013 error_setg_errno(errp, errno, "cannot write new account password");
2014 goto out;
2015 }
2016 close(datafd[1]);
2017 datafd[1] = -1;
2018
2019 ga_wait_child(pid, &status, &local_err);
2020 if (local_err) {
2021 error_propagate(errp, local_err);
2022 goto out;
2023 }
2024
2025 if (!WIFEXITED(status)) {
2026 error_setg(errp, "child process has terminated abnormally");
2027 goto out;
2028 }
2029
2030 if (WEXITSTATUS(status)) {
2031 error_setg(errp, "child process has failed to set user password");
2032 goto out;
2033 }
2034
2035 out:
2036 g_free(chpasswddata);
2037 g_free(rawpasswddata);
2038 g_free(passwd_path);
2039 if (datafd[0] != -1) {
2040 close(datafd[0]);
2041 }
2042 if (datafd[1] != -1) {
2043 close(datafd[1]);
2044 }
2045 }
2046
2047 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
2048 int size, Error **errp)
2049 {
2050 int fd;
2051 int res;
2052
2053 errno = 0;
2054 fd = openat(dirfd, pathname, O_RDONLY);
2055 if (fd == -1) {
2056 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2057 return;
2058 }
2059
2060 res = pread(fd, buf, size, 0);
2061 if (res == -1) {
2062 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
2063 } else if (res == 0) {
2064 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
2065 }
2066 close(fd);
2067 }
2068
2069 static void ga_write_sysfs_file(int dirfd, const char *pathname,
2070 const char *buf, int size, Error **errp)
2071 {
2072 int fd;
2073
2074 errno = 0;
2075 fd = openat(dirfd, pathname, O_WRONLY);
2076 if (fd == -1) {
2077 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2078 return;
2079 }
2080
2081 if (pwrite(fd, buf, size, 0) == -1) {
2082 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
2083 }
2084
2085 close(fd);
2086 }
2087
2088 /* Transfer online/offline status between @mem_blk and the guest system.
2089 *
2090 * On input either @errp or *@errp must be NULL.
2091 *
2092 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
2093 * - R: mem_blk->phys_index
2094 * - W: mem_blk->online
2095 * - W: mem_blk->can_offline
2096 *
2097 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
2098 * - R: mem_blk->phys_index
2099 * - R: mem_blk->online
2100 *- R: mem_blk->can_offline
2101 * Written members remain unmodified on error.
2102 */
2103 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
2104 GuestMemoryBlockResponse *result,
2105 Error **errp)
2106 {
2107 char *dirpath;
2108 int dirfd;
2109 char *status;
2110 Error *local_err = NULL;
2111
2112 if (!sys2memblk) {
2113 DIR *dp;
2114
2115 if (!result) {
2116 error_setg(errp, "Internal error, 'result' should not be NULL");
2117 return;
2118 }
2119 errno = 0;
2120 dp = opendir("/sys/devices/system/memory/");
2121 /* if there is no 'memory' directory in sysfs,
2122 * we think this VM does not support online/offline memory block,
2123 * any other solution?
2124 */
2125 if (!dp && errno == ENOENT) {
2126 result->response =
2127 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2128 goto out1;
2129 }
2130 closedir(dp);
2131 }
2132
2133 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
2134 mem_blk->phys_index);
2135 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2136 if (dirfd == -1) {
2137 if (sys2memblk) {
2138 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2139 } else {
2140 if (errno == ENOENT) {
2141 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
2142 } else {
2143 result->response =
2144 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2145 }
2146 }
2147 g_free(dirpath);
2148 goto out1;
2149 }
2150 g_free(dirpath);
2151
2152 status = g_malloc0(10);
2153 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
2154 if (local_err) {
2155 /* treat with sysfs file that not exist in old kernel */
2156 if (errno == ENOENT) {
2157 error_free(local_err);
2158 if (sys2memblk) {
2159 mem_blk->online = true;
2160 mem_blk->can_offline = false;
2161 } else if (!mem_blk->online) {
2162 result->response =
2163 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2164 }
2165 } else {
2166 if (sys2memblk) {
2167 error_propagate(errp, local_err);
2168 } else {
2169 result->response =
2170 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2171 }
2172 }
2173 goto out2;
2174 }
2175
2176 if (sys2memblk) {
2177 char removable = '0';
2178
2179 mem_blk->online = (strncmp(status, "online", 6) == 0);
2180
2181 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
2182 if (local_err) {
2183 /* if no 'removable' file, it doesn't support offline mem blk */
2184 if (errno == ENOENT) {
2185 error_free(local_err);
2186 mem_blk->can_offline = false;
2187 } else {
2188 error_propagate(errp, local_err);
2189 }
2190 } else {
2191 mem_blk->can_offline = (removable != '0');
2192 }
2193 } else {
2194 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
2195 char *new_state = mem_blk->online ? g_strdup("online") :
2196 g_strdup("offline");
2197
2198 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
2199 &local_err);
2200 g_free(new_state);
2201 if (local_err) {
2202 error_free(local_err);
2203 result->response =
2204 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2205 goto out2;
2206 }
2207
2208 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
2209 result->has_error_code = false;
2210 } /* otherwise pretend successful re-(on|off)-lining */
2211 }
2212 g_free(status);
2213 close(dirfd);
2214 return;
2215
2216 out2:
2217 g_free(status);
2218 close(dirfd);
2219 out1:
2220 if (!sys2memblk) {
2221 result->has_error_code = true;
2222 result->error_code = errno;
2223 }
2224 }
2225
2226 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2227 {
2228 GuestMemoryBlockList *head, **link;
2229 Error *local_err = NULL;
2230 struct dirent *de;
2231 DIR *dp;
2232
2233 head = NULL;
2234 link = &head;
2235
2236 dp = opendir("/sys/devices/system/memory/");
2237 if (!dp) {
2238 /* it's ok if this happens to be a system that doesn't expose
2239 * memory blocks via sysfs, but otherwise we should report
2240 * an error
2241 */
2242 if (errno != ENOENT) {
2243 error_setg_errno(errp, errno, "Can't open directory"
2244 "\"/sys/devices/system/memory/\"");
2245 }
2246 return NULL;
2247 }
2248
2249 /* Note: the phys_index of memory block may be discontinuous,
2250 * this is because a memblk is the unit of the Sparse Memory design, which
2251 * allows discontinuous memory ranges (ex. NUMA), so here we should
2252 * traverse the memory block directory.
2253 */
2254 while ((de = readdir(dp)) != NULL) {
2255 GuestMemoryBlock *mem_blk;
2256 GuestMemoryBlockList *entry;
2257
2258 if ((strncmp(de->d_name, "memory", 6) != 0) ||
2259 !(de->d_type & DT_DIR)) {
2260 continue;
2261 }
2262
2263 mem_blk = g_malloc0(sizeof *mem_blk);
2264 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */
2265 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
2266 mem_blk->has_can_offline = true; /* lolspeak ftw */
2267 transfer_memory_block(mem_blk, true, NULL, &local_err);
2268
2269 entry = g_malloc0(sizeof *entry);
2270 entry->value = mem_blk;
2271
2272 *link = entry;
2273 link = &entry->next;
2274 }
2275
2276 closedir(dp);
2277 if (local_err == NULL) {
2278 /* there's no guest with zero memory blocks */
2279 if (head == NULL) {
2280 error_setg(errp, "guest reported zero memory blocks!");
2281 }
2282 return head;
2283 }
2284
2285 qapi_free_GuestMemoryBlockList(head);
2286 error_propagate(errp, local_err);
2287 return NULL;
2288 }
2289
2290 GuestMemoryBlockResponseList *
2291 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2292 {
2293 GuestMemoryBlockResponseList *head, **link;
2294 Error *local_err = NULL;
2295
2296 head = NULL;
2297 link = &head;
2298
2299 while (mem_blks != NULL) {
2300 GuestMemoryBlockResponse *result;
2301 GuestMemoryBlockResponseList *entry;
2302 GuestMemoryBlock *current_mem_blk = mem_blks->value;
2303
2304 result = g_malloc0(sizeof(*result));
2305 result->phys_index = current_mem_blk->phys_index;
2306 transfer_memory_block(current_mem_blk, false, result, &local_err);
2307 if (local_err) { /* should never happen */
2308 goto err;
2309 }
2310 entry = g_malloc0(sizeof *entry);
2311 entry->value = result;
2312
2313 *link = entry;
2314 link = &entry->next;
2315 mem_blks = mem_blks->next;
2316 }
2317
2318 return head;
2319 err:
2320 qapi_free_GuestMemoryBlockResponseList(head);
2321 error_propagate(errp, local_err);
2322 return NULL;
2323 }
2324
2325 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2326 {
2327 Error *local_err = NULL;
2328 char *dirpath;
2329 int dirfd;
2330 char *buf;
2331 GuestMemoryBlockInfo *info;
2332
2333 dirpath = g_strdup_printf("/sys/devices/system/memory/");
2334 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2335 if (dirfd == -1) {
2336 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2337 g_free(dirpath);
2338 return NULL;
2339 }
2340 g_free(dirpath);
2341
2342 buf = g_malloc0(20);
2343 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
2344 close(dirfd);
2345 if (local_err) {
2346 g_free(buf);
2347 error_propagate(errp, local_err);
2348 return NULL;
2349 }
2350
2351 info = g_new0(GuestMemoryBlockInfo, 1);
2352 info->size = strtol(buf, NULL, 16); /* the unit is bytes */
2353
2354 g_free(buf);
2355
2356 return info;
2357 }
2358
2359 #else /* defined(__linux__) */
2360
2361 void qmp_guest_suspend_disk(Error **errp)
2362 {
2363 error_setg(errp, QERR_UNSUPPORTED);
2364 }
2365
2366 void qmp_guest_suspend_ram(Error **errp)
2367 {
2368 error_setg(errp, QERR_UNSUPPORTED);
2369 }
2370
2371 void qmp_guest_suspend_hybrid(Error **errp)
2372 {
2373 error_setg(errp, QERR_UNSUPPORTED);
2374 }
2375
2376 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2377 {
2378 error_setg(errp, QERR_UNSUPPORTED);
2379 return NULL;
2380 }
2381
2382 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2383 {
2384 error_setg(errp, QERR_UNSUPPORTED);
2385 return NULL;
2386 }
2387
2388 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2389 {
2390 error_setg(errp, QERR_UNSUPPORTED);
2391 return -1;
2392 }
2393
2394 void qmp_guest_set_user_password(const char *username,
2395 const char *password,
2396 bool crypted,
2397 Error **errp)
2398 {
2399 error_setg(errp, QERR_UNSUPPORTED);
2400 }
2401
2402 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2403 {
2404 error_setg(errp, QERR_UNSUPPORTED);
2405 return NULL;
2406 }
2407
2408 GuestMemoryBlockResponseList *
2409 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2410 {
2411 error_setg(errp, QERR_UNSUPPORTED);
2412 return NULL;
2413 }
2414
2415 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2416 {
2417 error_setg(errp, QERR_UNSUPPORTED);
2418 return NULL;
2419 }
2420
2421 #endif
2422
2423 #if !defined(CONFIG_FSFREEZE)
2424
2425 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
2426 {
2427 error_setg(errp, QERR_UNSUPPORTED);
2428 return NULL;
2429 }
2430
2431 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
2432 {
2433 error_setg(errp, QERR_UNSUPPORTED);
2434
2435 return 0;
2436 }
2437
2438 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
2439 {
2440 error_setg(errp, QERR_UNSUPPORTED);
2441
2442 return 0;
2443 }
2444
2445 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
2446 strList *mountpoints,
2447 Error **errp)
2448 {
2449 error_setg(errp, QERR_UNSUPPORTED);
2450
2451 return 0;
2452 }
2453
2454 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
2455 {
2456 error_setg(errp, QERR_UNSUPPORTED);
2457
2458 return 0;
2459 }
2460 #endif /* CONFIG_FSFREEZE */
2461
2462 #if !defined(CONFIG_FSTRIM)
2463 GuestFilesystemTrimResponse *
2464 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
2465 {
2466 error_setg(errp, QERR_UNSUPPORTED);
2467 return NULL;
2468 }
2469 #endif
2470
2471 /* add unsupported commands to the blacklist */
2472 GList *ga_command_blacklist_init(GList *blacklist)
2473 {
2474 #if !defined(__linux__)
2475 {
2476 const char *list[] = {
2477 "guest-suspend-disk", "guest-suspend-ram",
2478 "guest-suspend-hybrid", "guest-network-get-interfaces",
2479 "guest-get-vcpus", "guest-set-vcpus",
2480 "guest-get-memory-blocks", "guest-set-memory-blocks",
2481 "guest-get-memory-block-size", NULL};
2482 char **p = (char **)list;
2483
2484 while (*p) {
2485 blacklist = g_list_append(blacklist, g_strdup(*p++));
2486 }
2487 }
2488 #endif
2489
2490 #if !defined(CONFIG_FSFREEZE)
2491 {
2492 const char *list[] = {
2493 "guest-get-fsinfo", "guest-fsfreeze-status",
2494 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
2495 "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL};
2496 char **p = (char **)list;
2497
2498 while (*p) {
2499 blacklist = g_list_append(blacklist, g_strdup(*p++));
2500 }
2501 }
2502 #endif
2503
2504 #if !defined(CONFIG_FSTRIM)
2505 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim"));
2506 #endif
2507
2508 return blacklist;
2509 }
2510
2511 /* register init/cleanup routines for stateful command groups */
2512 void ga_command_state_init(GAState *s, GACommandState *cs)
2513 {
2514 #if defined(CONFIG_FSFREEZE)
2515 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
2516 #endif
2517 }