Merge remote-tracking branch 'remotes/vivier/tags/trivial-branch-for-6.2-pull-request...
[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/utsname.h>
17 #include <sys/wait.h>
18 #include <dirent.h>
19 #include "qemu-common.h"
20 #include "guest-agent-core.h"
21 #include "qga-qapi-commands.h"
22 #include "qapi/error.h"
23 #include "qapi/qmp/qerror.h"
24 #include "qemu/queue.h"
25 #include "qemu/host-utils.h"
26 #include "qemu/sockets.h"
27 #include "qemu/base64.h"
28 #include "qemu/cutils.h"
29 #include "commands-common.h"
30
31 #ifdef HAVE_UTMPX
32 #include <utmpx.h>
33 #endif
34
35 #ifndef CONFIG_HAS_ENVIRON
36 #ifdef __APPLE__
37 #include <crt_externs.h>
38 #define environ (*_NSGetEnviron())
39 #else
40 extern char **environ;
41 #endif
42 #endif
43
44 #if defined(__linux__)
45 #include <mntent.h>
46 #include <linux/fs.h>
47 #include <ifaddrs.h>
48 #include <arpa/inet.h>
49 #include <sys/socket.h>
50 #include <net/if.h>
51 #include <sys/statvfs.h>
52
53 #ifdef CONFIG_LIBUDEV
54 #include <libudev.h>
55 #endif
56
57 #ifdef FIFREEZE
58 #define CONFIG_FSFREEZE
59 #endif
60 #ifdef FITRIM
61 #define CONFIG_FSTRIM
62 #endif
63 #endif
64
65 static void ga_wait_child(pid_t pid, int *status, Error **errp)
66 {
67 pid_t rpid;
68
69 *status = 0;
70
71 do {
72 rpid = waitpid(pid, status, 0);
73 } while (rpid == -1 && errno == EINTR);
74
75 if (rpid == -1) {
76 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
77 pid);
78 return;
79 }
80
81 g_assert(rpid == pid);
82 }
83
84 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
85 {
86 const char *shutdown_flag;
87 Error *local_err = NULL;
88 pid_t pid;
89 int status;
90
91 slog("guest-shutdown called, mode: %s", mode);
92 if (!has_mode || strcmp(mode, "powerdown") == 0) {
93 shutdown_flag = "-P";
94 } else if (strcmp(mode, "halt") == 0) {
95 shutdown_flag = "-H";
96 } else if (strcmp(mode, "reboot") == 0) {
97 shutdown_flag = "-r";
98 } else {
99 error_setg(errp,
100 "mode is invalid (valid values are: halt|powerdown|reboot");
101 return;
102 }
103
104 pid = fork();
105 if (pid == 0) {
106 /* child, start the shutdown */
107 setsid();
108 reopen_fd_to_null(0);
109 reopen_fd_to_null(1);
110 reopen_fd_to_null(2);
111
112 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
113 "hypervisor initiated shutdown", (char *)NULL, environ);
114 _exit(EXIT_FAILURE);
115 } else if (pid < 0) {
116 error_setg_errno(errp, errno, "failed to create child process");
117 return;
118 }
119
120 ga_wait_child(pid, &status, &local_err);
121 if (local_err) {
122 error_propagate(errp, local_err);
123 return;
124 }
125
126 if (!WIFEXITED(status)) {
127 error_setg(errp, "child process has terminated abnormally");
128 return;
129 }
130
131 if (WEXITSTATUS(status)) {
132 error_setg(errp, "child process has failed to shutdown");
133 return;
134 }
135
136 /* succeeded */
137 }
138
139 int64_t qmp_guest_get_time(Error **errp)
140 {
141 int ret;
142 qemu_timeval tq;
143
144 ret = qemu_gettimeofday(&tq);
145 if (ret < 0) {
146 error_setg_errno(errp, errno, "Failed to get time");
147 return -1;
148 }
149
150 return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
151 }
152
153 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
154 {
155 int ret;
156 int status;
157 pid_t pid;
158 Error *local_err = NULL;
159 struct timeval tv;
160 static const char hwclock_path[] = "/sbin/hwclock";
161 static int hwclock_available = -1;
162
163 if (hwclock_available < 0) {
164 hwclock_available = (access(hwclock_path, X_OK) == 0);
165 }
166
167 if (!hwclock_available) {
168 error_setg(errp, QERR_UNSUPPORTED);
169 return;
170 }
171
172 /* If user has passed a time, validate and set it. */
173 if (has_time) {
174 GDate date = { 0, };
175
176 /* year-2038 will overflow in case time_t is 32bit */
177 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
178 error_setg(errp, "Time %" PRId64 " is too large", time_ns);
179 return;
180 }
181
182 tv.tv_sec = time_ns / 1000000000;
183 tv.tv_usec = (time_ns % 1000000000) / 1000;
184 g_date_set_time_t(&date, tv.tv_sec);
185 if (date.year < 1970 || date.year >= 2070) {
186 error_setg_errno(errp, errno, "Invalid time");
187 return;
188 }
189
190 ret = settimeofday(&tv, NULL);
191 if (ret < 0) {
192 error_setg_errno(errp, errno, "Failed to set time to guest");
193 return;
194 }
195 }
196
197 /* Now, if user has passed a time to set and the system time is set, we
198 * just need to synchronize the hardware clock. However, if no time was
199 * passed, user is requesting the opposite: set the system time from the
200 * hardware clock (RTC). */
201 pid = fork();
202 if (pid == 0) {
203 setsid();
204 reopen_fd_to_null(0);
205 reopen_fd_to_null(1);
206 reopen_fd_to_null(2);
207
208 /* Use '/sbin/hwclock -w' to set RTC from the system time,
209 * or '/sbin/hwclock -s' to set the system time from RTC. */
210 execle(hwclock_path, "hwclock", has_time ? "-w" : "-s",
211 NULL, environ);
212 _exit(EXIT_FAILURE);
213 } else if (pid < 0) {
214 error_setg_errno(errp, errno, "failed to create child process");
215 return;
216 }
217
218 ga_wait_child(pid, &status, &local_err);
219 if (local_err) {
220 error_propagate(errp, local_err);
221 return;
222 }
223
224 if (!WIFEXITED(status)) {
225 error_setg(errp, "child process has terminated abnormally");
226 return;
227 }
228
229 if (WEXITSTATUS(status)) {
230 error_setg(errp, "hwclock failed to set hardware clock to system time");
231 return;
232 }
233 }
234
235 typedef enum {
236 RW_STATE_NEW,
237 RW_STATE_READING,
238 RW_STATE_WRITING,
239 } RwState;
240
241 struct GuestFileHandle {
242 uint64_t id;
243 FILE *fh;
244 RwState state;
245 QTAILQ_ENTRY(GuestFileHandle) next;
246 };
247
248 static struct {
249 QTAILQ_HEAD(, GuestFileHandle) filehandles;
250 } guest_file_state = {
251 .filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles),
252 };
253
254 static int64_t guest_file_handle_add(FILE *fh, Error **errp)
255 {
256 GuestFileHandle *gfh;
257 int64_t handle;
258
259 handle = ga_get_fd_handle(ga_state, errp);
260 if (handle < 0) {
261 return -1;
262 }
263
264 gfh = g_new0(GuestFileHandle, 1);
265 gfh->id = handle;
266 gfh->fh = fh;
267 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
268
269 return handle;
270 }
271
272 GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
273 {
274 GuestFileHandle *gfh;
275
276 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
277 {
278 if (gfh->id == id) {
279 return gfh;
280 }
281 }
282
283 error_setg(errp, "handle '%" PRId64 "' has not been found", id);
284 return NULL;
285 }
286
287 typedef const char * const ccpc;
288
289 #ifndef O_BINARY
290 #define O_BINARY 0
291 #endif
292
293 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
294 static const struct {
295 ccpc *forms;
296 int oflag_base;
297 } guest_file_open_modes[] = {
298 { (ccpc[]){ "r", NULL }, O_RDONLY },
299 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY },
300 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC },
301 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY },
302 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND },
303 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
304 { (ccpc[]){ "r+", NULL }, O_RDWR },
305 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY },
306 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC },
307 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY },
308 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND },
309 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY }
310 };
311
312 static int
313 find_open_flag(const char *mode_str, Error **errp)
314 {
315 unsigned mode;
316
317 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
318 ccpc *form;
319
320 form = guest_file_open_modes[mode].forms;
321 while (*form != NULL && strcmp(*form, mode_str) != 0) {
322 ++form;
323 }
324 if (*form != NULL) {
325 break;
326 }
327 }
328
329 if (mode == ARRAY_SIZE(guest_file_open_modes)) {
330 error_setg(errp, "invalid file open mode '%s'", mode_str);
331 return -1;
332 }
333 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
334 }
335
336 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
337 S_IRGRP | S_IWGRP | \
338 S_IROTH | S_IWOTH)
339
340 static FILE *
341 safe_open_or_create(const char *path, const char *mode, Error **errp)
342 {
343 Error *local_err = NULL;
344 int oflag;
345
346 oflag = find_open_flag(mode, &local_err);
347 if (local_err == NULL) {
348 int fd;
349
350 /* If the caller wants / allows creation of a new file, we implement it
351 * with a two step process: open() + (open() / fchmod()).
352 *
353 * First we insist on creating the file exclusively as a new file. If
354 * that succeeds, we're free to set any file-mode bits on it. (The
355 * motivation is that we want to set those file-mode bits independently
356 * of the current umask.)
357 *
358 * If the exclusive creation fails because the file already exists
359 * (EEXIST is not possible for any other reason), we just attempt to
360 * open the file, but in this case we won't be allowed to change the
361 * file-mode bits on the preexistent file.
362 *
363 * The pathname should never disappear between the two open()s in
364 * practice. If it happens, then someone very likely tried to race us.
365 * In this case just go ahead and report the ENOENT from the second
366 * open() to the caller.
367 *
368 * If the caller wants to open a preexistent file, then the first
369 * open() is decisive and its third argument is ignored, and the second
370 * open() and the fchmod() are never called.
371 */
372 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
373 if (fd == -1 && errno == EEXIST) {
374 oflag &= ~(unsigned)O_CREAT;
375 fd = open(path, oflag);
376 }
377
378 if (fd == -1) {
379 error_setg_errno(&local_err, errno, "failed to open file '%s' "
380 "(mode: '%s')", path, mode);
381 } else {
382 qemu_set_cloexec(fd);
383
384 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
385 error_setg_errno(&local_err, errno, "failed to set permission "
386 "0%03o on new file '%s' (mode: '%s')",
387 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
388 } else {
389 FILE *f;
390
391 f = fdopen(fd, mode);
392 if (f == NULL) {
393 error_setg_errno(&local_err, errno, "failed to associate "
394 "stdio stream with file descriptor %d, "
395 "file '%s' (mode: '%s')", fd, path, mode);
396 } else {
397 return f;
398 }
399 }
400
401 close(fd);
402 if (oflag & O_CREAT) {
403 unlink(path);
404 }
405 }
406 }
407
408 error_propagate(errp, local_err);
409 return NULL;
410 }
411
412 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
413 Error **errp)
414 {
415 FILE *fh;
416 Error *local_err = NULL;
417 int64_t handle;
418
419 if (!has_mode) {
420 mode = "r";
421 }
422 slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
423 fh = safe_open_or_create(path, mode, &local_err);
424 if (local_err != NULL) {
425 error_propagate(errp, local_err);
426 return -1;
427 }
428
429 /* set fd non-blocking to avoid common use cases (like reading from a
430 * named pipe) from hanging the agent
431 */
432 qemu_set_nonblock(fileno(fh));
433
434 handle = guest_file_handle_add(fh, errp);
435 if (handle < 0) {
436 fclose(fh);
437 return -1;
438 }
439
440 slog("guest-file-open, handle: %" PRId64, handle);
441 return handle;
442 }
443
444 void qmp_guest_file_close(int64_t handle, Error **errp)
445 {
446 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
447 int ret;
448
449 slog("guest-file-close called, handle: %" PRId64, handle);
450 if (!gfh) {
451 return;
452 }
453
454 ret = fclose(gfh->fh);
455 if (ret == EOF) {
456 error_setg_errno(errp, errno, "failed to close handle");
457 return;
458 }
459
460 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
461 g_free(gfh);
462 }
463
464 GuestFileRead *guest_file_read_unsafe(GuestFileHandle *gfh,
465 int64_t count, Error **errp)
466 {
467 GuestFileRead *read_data = NULL;
468 guchar *buf;
469 FILE *fh = gfh->fh;
470 size_t read_count;
471
472 /* explicitly flush when switching from writing to reading */
473 if (gfh->state == RW_STATE_WRITING) {
474 int ret = fflush(fh);
475 if (ret == EOF) {
476 error_setg_errno(errp, errno, "failed to flush file");
477 return NULL;
478 }
479 gfh->state = RW_STATE_NEW;
480 }
481
482 buf = g_malloc0(count + 1);
483 read_count = fread(buf, 1, count, fh);
484 if (ferror(fh)) {
485 error_setg_errno(errp, errno, "failed to read file");
486 } else {
487 buf[read_count] = 0;
488 read_data = g_new0(GuestFileRead, 1);
489 read_data->count = read_count;
490 read_data->eof = feof(fh);
491 if (read_count) {
492 read_data->buf_b64 = g_base64_encode(buf, read_count);
493 }
494 gfh->state = RW_STATE_READING;
495 }
496 g_free(buf);
497 clearerr(fh);
498
499 return read_data;
500 }
501
502 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
503 bool has_count, int64_t count,
504 Error **errp)
505 {
506 GuestFileWrite *write_data = NULL;
507 guchar *buf;
508 gsize buf_len;
509 int write_count;
510 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
511 FILE *fh;
512
513 if (!gfh) {
514 return NULL;
515 }
516
517 fh = gfh->fh;
518
519 if (gfh->state == RW_STATE_READING) {
520 int ret = fseek(fh, 0, SEEK_CUR);
521 if (ret == -1) {
522 error_setg_errno(errp, errno, "failed to seek file");
523 return NULL;
524 }
525 gfh->state = RW_STATE_NEW;
526 }
527
528 buf = qbase64_decode(buf_b64, -1, &buf_len, errp);
529 if (!buf) {
530 return NULL;
531 }
532
533 if (!has_count) {
534 count = buf_len;
535 } else if (count < 0 || count > buf_len) {
536 error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
537 count);
538 g_free(buf);
539 return NULL;
540 }
541
542 write_count = fwrite(buf, 1, count, fh);
543 if (ferror(fh)) {
544 error_setg_errno(errp, errno, "failed to write to file");
545 slog("guest-file-write failed, handle: %" PRId64, handle);
546 } else {
547 write_data = g_new0(GuestFileWrite, 1);
548 write_data->count = write_count;
549 write_data->eof = feof(fh);
550 gfh->state = RW_STATE_WRITING;
551 }
552 g_free(buf);
553 clearerr(fh);
554
555 return write_data;
556 }
557
558 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
559 GuestFileWhence *whence_code,
560 Error **errp)
561 {
562 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
563 GuestFileSeek *seek_data = NULL;
564 FILE *fh;
565 int ret;
566 int whence;
567 Error *err = NULL;
568
569 if (!gfh) {
570 return NULL;
571 }
572
573 /* We stupidly exposed 'whence':'int' in our qapi */
574 whence = ga_parse_whence(whence_code, &err);
575 if (err) {
576 error_propagate(errp, err);
577 return NULL;
578 }
579
580 fh = gfh->fh;
581 ret = fseek(fh, offset, whence);
582 if (ret == -1) {
583 error_setg_errno(errp, errno, "failed to seek file");
584 if (errno == ESPIPE) {
585 /* file is non-seekable, stdio shouldn't be buffering anyways */
586 gfh->state = RW_STATE_NEW;
587 }
588 } else {
589 seek_data = g_new0(GuestFileSeek, 1);
590 seek_data->position = ftell(fh);
591 seek_data->eof = feof(fh);
592 gfh->state = RW_STATE_NEW;
593 }
594 clearerr(fh);
595
596 return seek_data;
597 }
598
599 void qmp_guest_file_flush(int64_t handle, Error **errp)
600 {
601 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
602 FILE *fh;
603 int ret;
604
605 if (!gfh) {
606 return;
607 }
608
609 fh = gfh->fh;
610 ret = fflush(fh);
611 if (ret == EOF) {
612 error_setg_errno(errp, errno, "failed to flush file");
613 } else {
614 gfh->state = RW_STATE_NEW;
615 }
616 }
617
618 /* linux-specific implementations. avoid this if at all possible. */
619 #if defined(__linux__)
620
621 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
622 typedef struct FsMount {
623 char *dirname;
624 char *devtype;
625 unsigned int devmajor, devminor;
626 QTAILQ_ENTRY(FsMount) next;
627 } FsMount;
628
629 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
630
631 static void free_fs_mount_list(FsMountList *mounts)
632 {
633 FsMount *mount, *temp;
634
635 if (!mounts) {
636 return;
637 }
638
639 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
640 QTAILQ_REMOVE(mounts, mount, next);
641 g_free(mount->dirname);
642 g_free(mount->devtype);
643 g_free(mount);
644 }
645 }
646
647 static int dev_major_minor(const char *devpath,
648 unsigned int *devmajor, unsigned int *devminor)
649 {
650 struct stat st;
651
652 *devmajor = 0;
653 *devminor = 0;
654
655 if (stat(devpath, &st) < 0) {
656 slog("failed to stat device file '%s': %s", devpath, strerror(errno));
657 return -1;
658 }
659 if (S_ISDIR(st.st_mode)) {
660 /* It is bind mount */
661 return -2;
662 }
663 if (S_ISBLK(st.st_mode)) {
664 *devmajor = major(st.st_rdev);
665 *devminor = minor(st.st_rdev);
666 return 0;
667 }
668 return -1;
669 }
670
671 /*
672 * Walk the mount table and build a list of local file systems
673 */
674 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
675 {
676 struct mntent *ment;
677 FsMount *mount;
678 char const *mtab = "/proc/self/mounts";
679 FILE *fp;
680 unsigned int devmajor, devminor;
681
682 fp = setmntent(mtab, "r");
683 if (!fp) {
684 error_setg(errp, "failed to open mtab file: '%s'", mtab);
685 return;
686 }
687
688 while ((ment = getmntent(fp))) {
689 /*
690 * An entry which device name doesn't start with a '/' is
691 * either a dummy file system or a network file system.
692 * Add special handling for smbfs and cifs as is done by
693 * coreutils as well.
694 */
695 if ((ment->mnt_fsname[0] != '/') ||
696 (strcmp(ment->mnt_type, "smbfs") == 0) ||
697 (strcmp(ment->mnt_type, "cifs") == 0)) {
698 continue;
699 }
700 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
701 /* Skip bind mounts */
702 continue;
703 }
704
705 mount = g_new0(FsMount, 1);
706 mount->dirname = g_strdup(ment->mnt_dir);
707 mount->devtype = g_strdup(ment->mnt_type);
708 mount->devmajor = devmajor;
709 mount->devminor = devminor;
710
711 QTAILQ_INSERT_TAIL(mounts, mount, next);
712 }
713
714 endmntent(fp);
715 }
716
717 static void decode_mntname(char *name, int len)
718 {
719 int i, j = 0;
720 for (i = 0; i <= len; i++) {
721 if (name[i] != '\\') {
722 name[j++] = name[i];
723 } else if (name[i + 1] == '\\') {
724 name[j++] = '\\';
725 i++;
726 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
727 name[i + 2] >= '0' && name[i + 2] <= '7' &&
728 name[i + 3] >= '0' && name[i + 3] <= '7') {
729 name[j++] = (name[i + 1] - '0') * 64 +
730 (name[i + 2] - '0') * 8 +
731 (name[i + 3] - '0');
732 i += 3;
733 } else {
734 name[j++] = name[i];
735 }
736 }
737 }
738
739 static void build_fs_mount_list(FsMountList *mounts, Error **errp)
740 {
741 FsMount *mount;
742 char const *mountinfo = "/proc/self/mountinfo";
743 FILE *fp;
744 char *line = NULL, *dash;
745 size_t n;
746 char check;
747 unsigned int devmajor, devminor;
748 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
749
750 fp = fopen(mountinfo, "r");
751 if (!fp) {
752 build_fs_mount_list_from_mtab(mounts, errp);
753 return;
754 }
755
756 while (getline(&line, &n, fp) != -1) {
757 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
758 &devmajor, &devminor, &dir_s, &dir_e, &check);
759 if (ret < 3) {
760 continue;
761 }
762 dash = strstr(line + dir_e, " - ");
763 if (!dash) {
764 continue;
765 }
766 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
767 &type_s, &type_e, &dev_s, &dev_e, &check);
768 if (ret < 1) {
769 continue;
770 }
771 line[dir_e] = 0;
772 dash[type_e] = 0;
773 dash[dev_e] = 0;
774 decode_mntname(line + dir_s, dir_e - dir_s);
775 decode_mntname(dash + dev_s, dev_e - dev_s);
776 if (devmajor == 0) {
777 /* btrfs reports major number = 0 */
778 if (strcmp("btrfs", dash + type_s) != 0 ||
779 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
780 continue;
781 }
782 }
783
784 mount = g_new0(FsMount, 1);
785 mount->dirname = g_strdup(line + dir_s);
786 mount->devtype = g_strdup(dash + type_s);
787 mount->devmajor = devmajor;
788 mount->devminor = devminor;
789
790 QTAILQ_INSERT_TAIL(mounts, mount, next);
791 }
792 free(line);
793
794 fclose(fp);
795 }
796 #endif
797
798 #if defined(CONFIG_FSFREEZE)
799
800 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
801 {
802 char *path;
803 char *dpath;
804 char *driver = NULL;
805 char buf[PATH_MAX];
806 ssize_t len;
807
808 path = g_strndup(syspath, pathlen);
809 dpath = g_strdup_printf("%s/driver", path);
810 len = readlink(dpath, buf, sizeof(buf) - 1);
811 if (len != -1) {
812 buf[len] = 0;
813 driver = g_path_get_basename(buf);
814 }
815 g_free(dpath);
816 g_free(path);
817 return driver;
818 }
819
820 static int compare_uint(const void *_a, const void *_b)
821 {
822 unsigned int a = *(unsigned int *)_a;
823 unsigned int b = *(unsigned int *)_b;
824
825 return a < b ? -1 : a > b ? 1 : 0;
826 }
827
828 /* Walk the specified sysfs and build a sorted list of host or ata numbers */
829 static int build_hosts(char const *syspath, char const *host, bool ata,
830 unsigned int *hosts, int hosts_max, Error **errp)
831 {
832 char *path;
833 DIR *dir;
834 struct dirent *entry;
835 int i = 0;
836
837 path = g_strndup(syspath, host - syspath);
838 dir = opendir(path);
839 if (!dir) {
840 error_setg_errno(errp, errno, "opendir(\"%s\")", path);
841 g_free(path);
842 return -1;
843 }
844
845 while (i < hosts_max) {
846 entry = readdir(dir);
847 if (!entry) {
848 break;
849 }
850 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
851 ++i;
852 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
853 ++i;
854 }
855 }
856
857 qsort(hosts, i, sizeof(hosts[0]), compare_uint);
858
859 g_free(path);
860 closedir(dir);
861 return i;
862 }
863
864 /*
865 * Store disk device info for devices on the PCI bus.
866 * Returns true if information has been stored, or false for failure.
867 */
868 static bool build_guest_fsinfo_for_pci_dev(char const *syspath,
869 GuestDiskAddress *disk,
870 Error **errp)
871 {
872 unsigned int pci[4], host, hosts[8], tgt[3];
873 int i, nhosts = 0, pcilen;
874 GuestPCIAddress *pciaddr = disk->pci_controller;
875 bool has_ata = false, has_host = false, has_tgt = false;
876 char *p, *q, *driver = NULL;
877 bool ret = false;
878
879 p = strstr(syspath, "/devices/pci");
880 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
881 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
882 g_debug("only pci device is supported: sysfs path '%s'", syspath);
883 return false;
884 }
885
886 p += 12 + pcilen;
887 while (true) {
888 driver = get_pci_driver(syspath, p - syspath, errp);
889 if (driver && (g_str_equal(driver, "ata_piix") ||
890 g_str_equal(driver, "sym53c8xx") ||
891 g_str_equal(driver, "virtio-pci") ||
892 g_str_equal(driver, "ahci"))) {
893 break;
894 }
895
896 g_free(driver);
897 if (sscanf(p, "/%x:%x:%x.%x%n",
898 pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) {
899 p += pcilen;
900 continue;
901 }
902
903 g_debug("unsupported driver or sysfs path '%s'", syspath);
904 return false;
905 }
906
907 p = strstr(syspath, "/target");
908 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
909 tgt, tgt + 1, tgt + 2) == 3) {
910 has_tgt = true;
911 }
912
913 p = strstr(syspath, "/ata");
914 if (p) {
915 q = p + 4;
916 has_ata = true;
917 } else {
918 p = strstr(syspath, "/host");
919 q = p + 5;
920 }
921 if (p && sscanf(q, "%u", &host) == 1) {
922 has_host = true;
923 nhosts = build_hosts(syspath, p, has_ata, hosts,
924 ARRAY_SIZE(hosts), errp);
925 if (nhosts < 0) {
926 goto cleanup;
927 }
928 }
929
930 pciaddr->domain = pci[0];
931 pciaddr->bus = pci[1];
932 pciaddr->slot = pci[2];
933 pciaddr->function = pci[3];
934
935 if (strcmp(driver, "ata_piix") == 0) {
936 /* a host per ide bus, target*:0:<unit>:0 */
937 if (!has_host || !has_tgt) {
938 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
939 goto cleanup;
940 }
941 for (i = 0; i < nhosts; i++) {
942 if (host == hosts[i]) {
943 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
944 disk->bus = i;
945 disk->unit = tgt[1];
946 break;
947 }
948 }
949 if (i >= nhosts) {
950 g_debug("no host for '%s' (driver '%s')", syspath, driver);
951 goto cleanup;
952 }
953 } else if (strcmp(driver, "sym53c8xx") == 0) {
954 /* scsi(LSI Logic): target*:0:<unit>:0 */
955 if (!has_tgt) {
956 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
957 goto cleanup;
958 }
959 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
960 disk->unit = tgt[1];
961 } else if (strcmp(driver, "virtio-pci") == 0) {
962 if (has_tgt) {
963 /* virtio-scsi: target*:0:0:<unit> */
964 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
965 disk->unit = tgt[2];
966 } else {
967 /* virtio-blk: 1 disk per 1 device */
968 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
969 }
970 } else if (strcmp(driver, "ahci") == 0) {
971 /* ahci: 1 host per 1 unit */
972 if (!has_host || !has_tgt) {
973 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
974 goto cleanup;
975 }
976 for (i = 0; i < nhosts; i++) {
977 if (host == hosts[i]) {
978 disk->unit = i;
979 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
980 break;
981 }
982 }
983 if (i >= nhosts) {
984 g_debug("no host for '%s' (driver '%s')", syspath, driver);
985 goto cleanup;
986 }
987 } else {
988 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
989 goto cleanup;
990 }
991
992 ret = true;
993
994 cleanup:
995 g_free(driver);
996 return ret;
997 }
998
999 /*
1000 * Store disk device info for non-PCI virtio devices (for example s390x
1001 * channel I/O devices). Returns true if information has been stored, or
1002 * false for failure.
1003 */
1004 static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath,
1005 GuestDiskAddress *disk,
1006 Error **errp)
1007 {
1008 unsigned int tgt[3];
1009 char *p;
1010
1011 if (!strstr(syspath, "/virtio") || !strstr(syspath, "/block")) {
1012 g_debug("Unsupported virtio device '%s'", syspath);
1013 return false;
1014 }
1015
1016 p = strstr(syspath, "/target");
1017 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
1018 &tgt[0], &tgt[1], &tgt[2]) == 3) {
1019 /* virtio-scsi: target*:0:<target>:<unit> */
1020 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
1021 disk->bus = tgt[0];
1022 disk->target = tgt[1];
1023 disk->unit = tgt[2];
1024 } else {
1025 /* virtio-blk: 1 disk per 1 device */
1026 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
1027 }
1028
1029 return true;
1030 }
1031
1032 /*
1033 * Store disk device info for CCW devices (s390x channel I/O devices).
1034 * Returns true if information has been stored, or false for failure.
1035 */
1036 static bool build_guest_fsinfo_for_ccw_dev(char const *syspath,
1037 GuestDiskAddress *disk,
1038 Error **errp)
1039 {
1040 unsigned int cssid, ssid, subchno, devno;
1041 char *p;
1042
1043 p = strstr(syspath, "/devices/css");
1044 if (!p || sscanf(p + 12, "%*x/%x.%x.%x/%*x.%*x.%x/",
1045 &cssid, &ssid, &subchno, &devno) < 4) {
1046 g_debug("could not parse ccw device sysfs path: %s", syspath);
1047 return false;
1048 }
1049
1050 disk->has_ccw_address = true;
1051 disk->ccw_address = g_new0(GuestCCWAddress, 1);
1052 disk->ccw_address->cssid = cssid;
1053 disk->ccw_address->ssid = ssid;
1054 disk->ccw_address->subchno = subchno;
1055 disk->ccw_address->devno = devno;
1056
1057 if (strstr(p, "/virtio")) {
1058 build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
1059 }
1060
1061 return true;
1062 }
1063
1064 /* Store disk device info specified by @sysfs into @fs */
1065 static void build_guest_fsinfo_for_real_device(char const *syspath,
1066 GuestFilesystemInfo *fs,
1067 Error **errp)
1068 {
1069 GuestDiskAddress *disk;
1070 GuestPCIAddress *pciaddr;
1071 bool has_hwinf;
1072 #ifdef CONFIG_LIBUDEV
1073 struct udev *udev = NULL;
1074 struct udev_device *udevice = NULL;
1075 #endif
1076
1077 pciaddr = g_new0(GuestPCIAddress, 1);
1078 pciaddr->domain = -1; /* -1 means field is invalid */
1079 pciaddr->bus = -1;
1080 pciaddr->slot = -1;
1081 pciaddr->function = -1;
1082
1083 disk = g_new0(GuestDiskAddress, 1);
1084 disk->pci_controller = pciaddr;
1085 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN;
1086
1087 #ifdef CONFIG_LIBUDEV
1088 udev = udev_new();
1089 udevice = udev_device_new_from_syspath(udev, syspath);
1090 if (udev == NULL || udevice == NULL) {
1091 g_debug("failed to query udev");
1092 } else {
1093 const char *devnode, *serial;
1094 devnode = udev_device_get_devnode(udevice);
1095 if (devnode != NULL) {
1096 disk->dev = g_strdup(devnode);
1097 disk->has_dev = true;
1098 }
1099 serial = udev_device_get_property_value(udevice, "ID_SERIAL");
1100 if (serial != NULL && *serial != 0) {
1101 disk->serial = g_strdup(serial);
1102 disk->has_serial = true;
1103 }
1104 }
1105
1106 udev_unref(udev);
1107 udev_device_unref(udevice);
1108 #endif
1109
1110 if (strstr(syspath, "/devices/pci")) {
1111 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
1112 } else if (strstr(syspath, "/devices/css")) {
1113 has_hwinf = build_guest_fsinfo_for_ccw_dev(syspath, disk, errp);
1114 } else if (strstr(syspath, "/virtio")) {
1115 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
1116 } else {
1117 g_debug("Unsupported device type for '%s'", syspath);
1118 has_hwinf = false;
1119 }
1120
1121 if (has_hwinf || disk->has_dev || disk->has_serial) {
1122 QAPI_LIST_PREPEND(fs->disk, disk);
1123 } else {
1124 qapi_free_GuestDiskAddress(disk);
1125 }
1126 }
1127
1128 static void build_guest_fsinfo_for_device(char const *devpath,
1129 GuestFilesystemInfo *fs,
1130 Error **errp);
1131
1132 /* Store a list of slave devices of virtual volume specified by @syspath into
1133 * @fs */
1134 static void build_guest_fsinfo_for_virtual_device(char const *syspath,
1135 GuestFilesystemInfo *fs,
1136 Error **errp)
1137 {
1138 Error *err = NULL;
1139 DIR *dir;
1140 char *dirpath;
1141 struct dirent *entry;
1142
1143 dirpath = g_strdup_printf("%s/slaves", syspath);
1144 dir = opendir(dirpath);
1145 if (!dir) {
1146 if (errno != ENOENT) {
1147 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
1148 }
1149 g_free(dirpath);
1150 return;
1151 }
1152
1153 for (;;) {
1154 errno = 0;
1155 entry = readdir(dir);
1156 if (entry == NULL) {
1157 if (errno) {
1158 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
1159 }
1160 break;
1161 }
1162
1163 if (entry->d_type == DT_LNK) {
1164 char *path;
1165
1166 g_debug(" slave device '%s'", entry->d_name);
1167 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
1168 build_guest_fsinfo_for_device(path, fs, &err);
1169 g_free(path);
1170
1171 if (err) {
1172 error_propagate(errp, err);
1173 break;
1174 }
1175 }
1176 }
1177
1178 g_free(dirpath);
1179 closedir(dir);
1180 }
1181
1182 static bool is_disk_virtual(const char *devpath, Error **errp)
1183 {
1184 g_autofree char *syspath = realpath(devpath, NULL);
1185
1186 if (!syspath) {
1187 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1188 return false;
1189 }
1190 return strstr(syspath, "/devices/virtual/block/") != NULL;
1191 }
1192
1193 /* Dispatch to functions for virtual/real device */
1194 static void build_guest_fsinfo_for_device(char const *devpath,
1195 GuestFilesystemInfo *fs,
1196 Error **errp)
1197 {
1198 ERRP_GUARD();
1199 g_autofree char *syspath = NULL;
1200 bool is_virtual = false;
1201
1202 syspath = realpath(devpath, NULL);
1203 if (!syspath) {
1204 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1205 return;
1206 }
1207
1208 if (!fs->name) {
1209 fs->name = g_path_get_basename(syspath);
1210 }
1211
1212 g_debug(" parse sysfs path '%s'", syspath);
1213 is_virtual = is_disk_virtual(syspath, errp);
1214 if (*errp != NULL) {
1215 return;
1216 }
1217 if (is_virtual) {
1218 build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
1219 } else {
1220 build_guest_fsinfo_for_real_device(syspath, fs, errp);
1221 }
1222 }
1223
1224 #ifdef CONFIG_LIBUDEV
1225
1226 /*
1227 * Wrapper around build_guest_fsinfo_for_device() for getting just
1228 * the disk address.
1229 */
1230 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp)
1231 {
1232 g_autoptr(GuestFilesystemInfo) fs = NULL;
1233
1234 fs = g_new0(GuestFilesystemInfo, 1);
1235 build_guest_fsinfo_for_device(syspath, fs, errp);
1236 if (fs->disk != NULL) {
1237 return g_steal_pointer(&fs->disk->value);
1238 }
1239 return NULL;
1240 }
1241
1242 static char *get_alias_for_syspath(const char *syspath)
1243 {
1244 struct udev *udev = NULL;
1245 struct udev_device *udevice = NULL;
1246 char *ret = NULL;
1247
1248 udev = udev_new();
1249 if (udev == NULL) {
1250 g_debug("failed to query udev");
1251 goto out;
1252 }
1253 udevice = udev_device_new_from_syspath(udev, syspath);
1254 if (udevice == NULL) {
1255 g_debug("failed to query udev for path: %s", syspath);
1256 goto out;
1257 } else {
1258 const char *alias = udev_device_get_property_value(
1259 udevice, "DM_NAME");
1260 /*
1261 * NULL means there was an error and empty string means there is no
1262 * alias. In case of no alias we return NULL instead of empty string.
1263 */
1264 if (alias == NULL) {
1265 g_debug("failed to query udev for device alias for: %s",
1266 syspath);
1267 } else if (*alias != 0) {
1268 ret = g_strdup(alias);
1269 }
1270 }
1271
1272 out:
1273 udev_unref(udev);
1274 udev_device_unref(udevice);
1275 return ret;
1276 }
1277
1278 static char *get_device_for_syspath(const char *syspath)
1279 {
1280 struct udev *udev = NULL;
1281 struct udev_device *udevice = NULL;
1282 char *ret = NULL;
1283
1284 udev = udev_new();
1285 if (udev == NULL) {
1286 g_debug("failed to query udev");
1287 goto out;
1288 }
1289 udevice = udev_device_new_from_syspath(udev, syspath);
1290 if (udevice == NULL) {
1291 g_debug("failed to query udev for path: %s", syspath);
1292 goto out;
1293 } else {
1294 ret = g_strdup(udev_device_get_devnode(udevice));
1295 }
1296
1297 out:
1298 udev_unref(udev);
1299 udev_device_unref(udevice);
1300 return ret;
1301 }
1302
1303 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk)
1304 {
1305 g_autofree char *deps_dir = NULL;
1306 const gchar *dep;
1307 GDir *dp_deps = NULL;
1308
1309 /* List dependent disks */
1310 deps_dir = g_strdup_printf("%s/slaves", disk_dir);
1311 g_debug(" listing entries in: %s", deps_dir);
1312 dp_deps = g_dir_open(deps_dir, 0, NULL);
1313 if (dp_deps == NULL) {
1314 g_debug("failed to list entries in %s", deps_dir);
1315 return;
1316 }
1317 disk->has_dependencies = true;
1318 while ((dep = g_dir_read_name(dp_deps)) != NULL) {
1319 g_autofree char *dep_dir = NULL;
1320 char *dev_name;
1321
1322 /* Add dependent disks */
1323 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep);
1324 dev_name = get_device_for_syspath(dep_dir);
1325 if (dev_name != NULL) {
1326 g_debug(" adding dependent device: %s", dev_name);
1327 QAPI_LIST_PREPEND(disk->dependencies, dev_name);
1328 }
1329 }
1330 g_dir_close(dp_deps);
1331 }
1332
1333 /*
1334 * Detect partitions subdirectory, name is "<disk_name><number>" or
1335 * "<disk_name>p<number>"
1336 *
1337 * @disk_name -- last component of /sys path (e.g. sda)
1338 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda)
1339 * @disk_dev -- device node of the disk (e.g. /dev/sda)
1340 */
1341 static GuestDiskInfoList *get_disk_partitions(
1342 GuestDiskInfoList *list,
1343 const char *disk_name, const char *disk_dir,
1344 const char *disk_dev)
1345 {
1346 GuestDiskInfoList *ret = list;
1347 struct dirent *de_disk;
1348 DIR *dp_disk = NULL;
1349 size_t len = strlen(disk_name);
1350
1351 dp_disk = opendir(disk_dir);
1352 while ((de_disk = readdir(dp_disk)) != NULL) {
1353 g_autofree char *partition_dir = NULL;
1354 char *dev_name;
1355 GuestDiskInfo *partition;
1356
1357 if (!(de_disk->d_type & DT_DIR)) {
1358 continue;
1359 }
1360
1361 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 &&
1362 ((*(de_disk->d_name + len) == 'p' &&
1363 isdigit(*(de_disk->d_name + len + 1))) ||
1364 isdigit(*(de_disk->d_name + len))))) {
1365 continue;
1366 }
1367
1368 partition_dir = g_strdup_printf("%s/%s",
1369 disk_dir, de_disk->d_name);
1370 dev_name = get_device_for_syspath(partition_dir);
1371 if (dev_name == NULL) {
1372 g_debug("Failed to get device name for syspath: %s",
1373 disk_dir);
1374 continue;
1375 }
1376 partition = g_new0(GuestDiskInfo, 1);
1377 partition->name = dev_name;
1378 partition->partition = true;
1379 partition->has_dependencies = true;
1380 /* Add parent disk as dependent for easier tracking of hierarchy */
1381 QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev));
1382
1383 QAPI_LIST_PREPEND(ret, partition);
1384 }
1385 closedir(dp_disk);
1386
1387 return ret;
1388 }
1389
1390 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1391 {
1392 GuestDiskInfoList *ret = NULL;
1393 GuestDiskInfo *disk;
1394 DIR *dp = NULL;
1395 struct dirent *de = NULL;
1396
1397 g_debug("listing /sys/block directory");
1398 dp = opendir("/sys/block");
1399 if (dp == NULL) {
1400 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\"");
1401 return NULL;
1402 }
1403 while ((de = readdir(dp)) != NULL) {
1404 g_autofree char *disk_dir = NULL, *line = NULL,
1405 *size_path = NULL;
1406 char *dev_name;
1407 Error *local_err = NULL;
1408 if (de->d_type != DT_LNK) {
1409 g_debug(" skipping entry: %s", de->d_name);
1410 continue;
1411 }
1412
1413 /* Check size and skip zero-sized disks */
1414 g_debug(" checking disk size");
1415 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name);
1416 if (!g_file_get_contents(size_path, &line, NULL, NULL)) {
1417 g_debug(" failed to read disk size");
1418 continue;
1419 }
1420 if (g_strcmp0(line, "0\n") == 0) {
1421 g_debug(" skipping zero-sized disk");
1422 continue;
1423 }
1424
1425 g_debug(" adding %s", de->d_name);
1426 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name);
1427 dev_name = get_device_for_syspath(disk_dir);
1428 if (dev_name == NULL) {
1429 g_debug("Failed to get device name for syspath: %s",
1430 disk_dir);
1431 continue;
1432 }
1433 disk = g_new0(GuestDiskInfo, 1);
1434 disk->name = dev_name;
1435 disk->partition = false;
1436 disk->alias = get_alias_for_syspath(disk_dir);
1437 disk->has_alias = (disk->alias != NULL);
1438 QAPI_LIST_PREPEND(ret, disk);
1439
1440 /* Get address for non-virtual devices */
1441 bool is_virtual = is_disk_virtual(disk_dir, &local_err);
1442 if (local_err != NULL) {
1443 g_debug(" failed to check disk path, ignoring error: %s",
1444 error_get_pretty(local_err));
1445 error_free(local_err);
1446 local_err = NULL;
1447 /* Don't try to get the address */
1448 is_virtual = true;
1449 }
1450 if (!is_virtual) {
1451 disk->address = get_disk_address(disk_dir, &local_err);
1452 if (local_err != NULL) {
1453 g_debug(" failed to get device info, ignoring error: %s",
1454 error_get_pretty(local_err));
1455 error_free(local_err);
1456 local_err = NULL;
1457 } else if (disk->address != NULL) {
1458 disk->has_address = true;
1459 }
1460 }
1461
1462 get_disk_deps(disk_dir, disk);
1463 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name);
1464 }
1465
1466 closedir(dp);
1467
1468 return ret;
1469 }
1470
1471 #else
1472
1473 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1474 {
1475 error_setg(errp, QERR_UNSUPPORTED);
1476 return NULL;
1477 }
1478
1479 #endif
1480
1481 /* Return a list of the disk device(s)' info which @mount lies on */
1482 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
1483 Error **errp)
1484 {
1485 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
1486 struct statvfs buf;
1487 unsigned long used, nonroot_total, fr_size;
1488 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
1489 mount->devmajor, mount->devminor);
1490
1491 fs->mountpoint = g_strdup(mount->dirname);
1492 fs->type = g_strdup(mount->devtype);
1493 build_guest_fsinfo_for_device(devpath, fs, errp);
1494
1495 if (statvfs(fs->mountpoint, &buf) == 0) {
1496 fr_size = buf.f_frsize;
1497 used = buf.f_blocks - buf.f_bfree;
1498 nonroot_total = used + buf.f_bavail;
1499 fs->used_bytes = used * fr_size;
1500 fs->total_bytes = nonroot_total * fr_size;
1501
1502 fs->has_total_bytes = true;
1503 fs->has_used_bytes = true;
1504 }
1505
1506 g_free(devpath);
1507
1508 return fs;
1509 }
1510
1511 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
1512 {
1513 FsMountList mounts;
1514 struct FsMount *mount;
1515 GuestFilesystemInfoList *ret = NULL;
1516 Error *local_err = NULL;
1517
1518 QTAILQ_INIT(&mounts);
1519 build_fs_mount_list(&mounts, &local_err);
1520 if (local_err) {
1521 error_propagate(errp, local_err);
1522 return NULL;
1523 }
1524
1525 QTAILQ_FOREACH(mount, &mounts, next) {
1526 g_debug("Building guest fsinfo for '%s'", mount->dirname);
1527
1528 QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err));
1529 if (local_err) {
1530 error_propagate(errp, local_err);
1531 qapi_free_GuestFilesystemInfoList(ret);
1532 ret = NULL;
1533 break;
1534 }
1535 }
1536
1537 free_fs_mount_list(&mounts);
1538 return ret;
1539 }
1540
1541
1542 typedef enum {
1543 FSFREEZE_HOOK_THAW = 0,
1544 FSFREEZE_HOOK_FREEZE,
1545 } FsfreezeHookArg;
1546
1547 static const char *fsfreeze_hook_arg_string[] = {
1548 "thaw",
1549 "freeze",
1550 };
1551
1552 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
1553 {
1554 int status;
1555 pid_t pid;
1556 const char *hook;
1557 const char *arg_str = fsfreeze_hook_arg_string[arg];
1558 Error *local_err = NULL;
1559
1560 hook = ga_fsfreeze_hook(ga_state);
1561 if (!hook) {
1562 return;
1563 }
1564 if (access(hook, X_OK) != 0) {
1565 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
1566 return;
1567 }
1568
1569 slog("executing fsfreeze hook with arg '%s'", arg_str);
1570 pid = fork();
1571 if (pid == 0) {
1572 setsid();
1573 reopen_fd_to_null(0);
1574 reopen_fd_to_null(1);
1575 reopen_fd_to_null(2);
1576
1577 execle(hook, hook, arg_str, NULL, environ);
1578 _exit(EXIT_FAILURE);
1579 } else if (pid < 0) {
1580 error_setg_errno(errp, errno, "failed to create child process");
1581 return;
1582 }
1583
1584 ga_wait_child(pid, &status, &local_err);
1585 if (local_err) {
1586 error_propagate(errp, local_err);
1587 return;
1588 }
1589
1590 if (!WIFEXITED(status)) {
1591 error_setg(errp, "fsfreeze hook has terminated abnormally");
1592 return;
1593 }
1594
1595 status = WEXITSTATUS(status);
1596 if (status) {
1597 error_setg(errp, "fsfreeze hook has failed with status %d", status);
1598 return;
1599 }
1600 }
1601
1602 /*
1603 * Return status of freeze/thaw
1604 */
1605 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1606 {
1607 if (ga_is_frozen(ga_state)) {
1608 return GUEST_FSFREEZE_STATUS_FROZEN;
1609 }
1610
1611 return GUEST_FSFREEZE_STATUS_THAWED;
1612 }
1613
1614 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1615 {
1616 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
1617 }
1618
1619 /*
1620 * Walk list of mounted file systems in the guest, and freeze the ones which
1621 * are real local file systems.
1622 */
1623 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1624 strList *mountpoints,
1625 Error **errp)
1626 {
1627 int ret = 0, i = 0;
1628 strList *list;
1629 FsMountList mounts;
1630 struct FsMount *mount;
1631 Error *local_err = NULL;
1632 int fd;
1633
1634 slog("guest-fsfreeze called");
1635
1636 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
1637 if (local_err) {
1638 error_propagate(errp, local_err);
1639 return -1;
1640 }
1641
1642 QTAILQ_INIT(&mounts);
1643 build_fs_mount_list(&mounts, &local_err);
1644 if (local_err) {
1645 error_propagate(errp, local_err);
1646 return -1;
1647 }
1648
1649 /* cannot risk guest agent blocking itself on a write in this state */
1650 ga_set_frozen(ga_state);
1651
1652 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) {
1653 /* To issue fsfreeze in the reverse order of mounts, check if the
1654 * mount is listed in the list here */
1655 if (has_mountpoints) {
1656 for (list = mountpoints; list; list = list->next) {
1657 if (strcmp(list->value, mount->dirname) == 0) {
1658 break;
1659 }
1660 }
1661 if (!list) {
1662 continue;
1663 }
1664 }
1665
1666 fd = qemu_open_old(mount->dirname, O_RDONLY);
1667 if (fd == -1) {
1668 error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
1669 goto error;
1670 }
1671
1672 /* we try to cull filesystems we know won't work in advance, but other
1673 * filesystems may not implement fsfreeze for less obvious reasons.
1674 * these will report EOPNOTSUPP. we simply ignore these when tallying
1675 * the number of frozen filesystems.
1676 * if a filesystem is mounted more than once (aka bind mount) a
1677 * consecutive attempt to freeze an already frozen filesystem will
1678 * return EBUSY.
1679 *
1680 * any other error means a failure to freeze a filesystem we
1681 * expect to be freezable, so return an error in those cases
1682 * and return system to thawed state.
1683 */
1684 ret = ioctl(fd, FIFREEZE);
1685 if (ret == -1) {
1686 if (errno != EOPNOTSUPP && errno != EBUSY) {
1687 error_setg_errno(errp, errno, "failed to freeze %s",
1688 mount->dirname);
1689 close(fd);
1690 goto error;
1691 }
1692 } else {
1693 i++;
1694 }
1695 close(fd);
1696 }
1697
1698 free_fs_mount_list(&mounts);
1699 /* We may not issue any FIFREEZE here.
1700 * Just unset ga_state here and ready for the next call.
1701 */
1702 if (i == 0) {
1703 ga_unset_frozen(ga_state);
1704 }
1705 return i;
1706
1707 error:
1708 free_fs_mount_list(&mounts);
1709 qmp_guest_fsfreeze_thaw(NULL);
1710 return 0;
1711 }
1712
1713 /*
1714 * Walk list of frozen file systems in the guest, and thaw them.
1715 */
1716 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1717 {
1718 int ret;
1719 FsMountList mounts;
1720 FsMount *mount;
1721 int fd, i = 0, logged;
1722 Error *local_err = NULL;
1723
1724 QTAILQ_INIT(&mounts);
1725 build_fs_mount_list(&mounts, &local_err);
1726 if (local_err) {
1727 error_propagate(errp, local_err);
1728 return 0;
1729 }
1730
1731 QTAILQ_FOREACH(mount, &mounts, next) {
1732 logged = false;
1733 fd = qemu_open_old(mount->dirname, O_RDONLY);
1734 if (fd == -1) {
1735 continue;
1736 }
1737 /* we have no way of knowing whether a filesystem was actually unfrozen
1738 * as a result of a successful call to FITHAW, only that if an error
1739 * was returned the filesystem was *not* unfrozen by that particular
1740 * call.
1741 *
1742 * since multiple preceding FIFREEZEs require multiple calls to FITHAW
1743 * to unfreeze, continuing issuing FITHAW until an error is returned,
1744 * in which case either the filesystem is in an unfreezable state, or,
1745 * more likely, it was thawed previously (and remains so afterward).
1746 *
1747 * also, since the most recent successful call is the one that did
1748 * the actual unfreeze, we can use this to provide an accurate count
1749 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
1750 * may * be useful for determining whether a filesystem was unfrozen
1751 * during the freeze/thaw phase by a process other than qemu-ga.
1752 */
1753 do {
1754 ret = ioctl(fd, FITHAW);
1755 if (ret == 0 && !logged) {
1756 i++;
1757 logged = true;
1758 }
1759 } while (ret == 0);
1760 close(fd);
1761 }
1762
1763 ga_unset_frozen(ga_state);
1764 free_fs_mount_list(&mounts);
1765
1766 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
1767
1768 return i;
1769 }
1770
1771 static void guest_fsfreeze_cleanup(void)
1772 {
1773 Error *err = NULL;
1774
1775 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
1776 qmp_guest_fsfreeze_thaw(&err);
1777 if (err) {
1778 slog("failed to clean up frozen filesystems: %s",
1779 error_get_pretty(err));
1780 error_free(err);
1781 }
1782 }
1783 }
1784 #endif /* CONFIG_FSFREEZE */
1785
1786 #if defined(CONFIG_FSTRIM)
1787 /*
1788 * Walk list of mounted file systems in the guest, and trim them.
1789 */
1790 GuestFilesystemTrimResponse *
1791 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1792 {
1793 GuestFilesystemTrimResponse *response;
1794 GuestFilesystemTrimResult *result;
1795 int ret = 0;
1796 FsMountList mounts;
1797 struct FsMount *mount;
1798 int fd;
1799 Error *local_err = NULL;
1800 struct fstrim_range r;
1801
1802 slog("guest-fstrim called");
1803
1804 QTAILQ_INIT(&mounts);
1805 build_fs_mount_list(&mounts, &local_err);
1806 if (local_err) {
1807 error_propagate(errp, local_err);
1808 return NULL;
1809 }
1810
1811 response = g_malloc0(sizeof(*response));
1812
1813 QTAILQ_FOREACH(mount, &mounts, next) {
1814 result = g_malloc0(sizeof(*result));
1815 result->path = g_strdup(mount->dirname);
1816
1817 QAPI_LIST_PREPEND(response->paths, result);
1818
1819 fd = qemu_open_old(mount->dirname, O_RDONLY);
1820 if (fd == -1) {
1821 result->error = g_strdup_printf("failed to open: %s",
1822 strerror(errno));
1823 result->has_error = true;
1824 continue;
1825 }
1826
1827 /* We try to cull filesystems we know won't work in advance, but other
1828 * filesystems may not implement fstrim for less obvious reasons.
1829 * These will report EOPNOTSUPP; while in some other cases ENOTTY
1830 * will be reported (e.g. CD-ROMs).
1831 * Any other error means an unexpected error.
1832 */
1833 r.start = 0;
1834 r.len = -1;
1835 r.minlen = has_minimum ? minimum : 0;
1836 ret = ioctl(fd, FITRIM, &r);
1837 if (ret == -1) {
1838 result->has_error = true;
1839 if (errno == ENOTTY || errno == EOPNOTSUPP) {
1840 result->error = g_strdup("trim not supported");
1841 } else {
1842 result->error = g_strdup_printf("failed to trim: %s",
1843 strerror(errno));
1844 }
1845 close(fd);
1846 continue;
1847 }
1848
1849 result->has_minimum = true;
1850 result->minimum = r.minlen;
1851 result->has_trimmed = true;
1852 result->trimmed = r.len;
1853 close(fd);
1854 }
1855
1856 free_fs_mount_list(&mounts);
1857 return response;
1858 }
1859 #endif /* CONFIG_FSTRIM */
1860
1861
1862 #define LINUX_SYS_STATE_FILE "/sys/power/state"
1863 #define SUSPEND_SUPPORTED 0
1864 #define SUSPEND_NOT_SUPPORTED 1
1865
1866 typedef enum {
1867 SUSPEND_MODE_DISK = 0,
1868 SUSPEND_MODE_RAM = 1,
1869 SUSPEND_MODE_HYBRID = 2,
1870 } SuspendMode;
1871
1872 /*
1873 * Executes a command in a child process using g_spawn_sync,
1874 * returning an int >= 0 representing the exit status of the
1875 * process.
1876 *
1877 * If the program wasn't found in path, returns -1.
1878 *
1879 * If a problem happened when creating the child process,
1880 * returns -1 and errp is set.
1881 */
1882 static int run_process_child(const char *command[], Error **errp)
1883 {
1884 int exit_status, spawn_flag;
1885 GError *g_err = NULL;
1886 bool success;
1887
1888 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL |
1889 G_SPAWN_STDERR_TO_DEV_NULL;
1890
1891 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag,
1892 NULL, NULL, NULL, NULL,
1893 &exit_status, &g_err);
1894
1895 if (success) {
1896 return WEXITSTATUS(exit_status);
1897 }
1898
1899 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) {
1900 error_setg(errp, "failed to create child process, error '%s'",
1901 g_err->message);
1902 }
1903
1904 g_error_free(g_err);
1905 return -1;
1906 }
1907
1908 static bool systemd_supports_mode(SuspendMode mode, Error **errp)
1909 {
1910 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend",
1911 "systemd-hybrid-sleep"};
1912 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL};
1913 int status;
1914
1915 status = run_process_child(cmd, errp);
1916
1917 /*
1918 * systemctl status uses LSB return codes so we can expect
1919 * status > 0 and be ok. To assert if the guest has support
1920 * for the selected suspend mode, status should be < 4. 4 is
1921 * the code for unknown service status, the return value when
1922 * the service does not exist. A common value is status = 3
1923 * (program is not running).
1924 */
1925 if (status > 0 && status < 4) {
1926 return true;
1927 }
1928
1929 return false;
1930 }
1931
1932 static void systemd_suspend(SuspendMode mode, Error **errp)
1933 {
1934 Error *local_err = NULL;
1935 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"};
1936 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL};
1937 int status;
1938
1939 status = run_process_child(cmd, &local_err);
1940
1941 if (status == 0) {
1942 return;
1943 }
1944
1945 if ((status == -1) && !local_err) {
1946 error_setg(errp, "the helper program 'systemctl %s' was not found",
1947 systemctl_args[mode]);
1948 return;
1949 }
1950
1951 if (local_err) {
1952 error_propagate(errp, local_err);
1953 } else {
1954 error_setg(errp, "the helper program 'systemctl %s' returned an "
1955 "unexpected exit status code (%d)",
1956 systemctl_args[mode], status);
1957 }
1958 }
1959
1960 static bool pmutils_supports_mode(SuspendMode mode, Error **errp)
1961 {
1962 Error *local_err = NULL;
1963 const char *pmutils_args[3] = {"--hibernate", "--suspend",
1964 "--suspend-hybrid"};
1965 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL};
1966 int status;
1967
1968 status = run_process_child(cmd, &local_err);
1969
1970 if (status == SUSPEND_SUPPORTED) {
1971 return true;
1972 }
1973
1974 if ((status == -1) && !local_err) {
1975 return false;
1976 }
1977
1978 if (local_err) {
1979 error_propagate(errp, local_err);
1980 } else {
1981 error_setg(errp,
1982 "the helper program '%s' returned an unexpected exit"
1983 " status code (%d)", "pm-is-supported", status);
1984 }
1985
1986 return false;
1987 }
1988
1989 static void pmutils_suspend(SuspendMode mode, Error **errp)
1990 {
1991 Error *local_err = NULL;
1992 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend",
1993 "pm-suspend-hybrid"};
1994 const char *cmd[2] = {pmutils_binaries[mode], NULL};
1995 int status;
1996
1997 status = run_process_child(cmd, &local_err);
1998
1999 if (status == 0) {
2000 return;
2001 }
2002
2003 if ((status == -1) && !local_err) {
2004 error_setg(errp, "the helper program '%s' was not found",
2005 pmutils_binaries[mode]);
2006 return;
2007 }
2008
2009 if (local_err) {
2010 error_propagate(errp, local_err);
2011 } else {
2012 error_setg(errp,
2013 "the helper program '%s' returned an unexpected exit"
2014 " status code (%d)", pmutils_binaries[mode], status);
2015 }
2016 }
2017
2018 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp)
2019 {
2020 const char *sysfile_strs[3] = {"disk", "mem", NULL};
2021 const char *sysfile_str = sysfile_strs[mode];
2022 char buf[32]; /* hopefully big enough */
2023 int fd;
2024 ssize_t ret;
2025
2026 if (!sysfile_str) {
2027 error_setg(errp, "unknown guest suspend mode");
2028 return false;
2029 }
2030
2031 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
2032 if (fd < 0) {
2033 return false;
2034 }
2035
2036 ret = read(fd, buf, sizeof(buf) - 1);
2037 close(fd);
2038 if (ret <= 0) {
2039 return false;
2040 }
2041 buf[ret] = '\0';
2042
2043 if (strstr(buf, sysfile_str)) {
2044 return true;
2045 }
2046 return false;
2047 }
2048
2049 static void linux_sys_state_suspend(SuspendMode mode, Error **errp)
2050 {
2051 Error *local_err = NULL;
2052 const char *sysfile_strs[3] = {"disk", "mem", NULL};
2053 const char *sysfile_str = sysfile_strs[mode];
2054 pid_t pid;
2055 int status;
2056
2057 if (!sysfile_str) {
2058 error_setg(errp, "unknown guest suspend mode");
2059 return;
2060 }
2061
2062 pid = fork();
2063 if (!pid) {
2064 /* child */
2065 int fd;
2066
2067 setsid();
2068 reopen_fd_to_null(0);
2069 reopen_fd_to_null(1);
2070 reopen_fd_to_null(2);
2071
2072 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
2073 if (fd < 0) {
2074 _exit(EXIT_FAILURE);
2075 }
2076
2077 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
2078 _exit(EXIT_FAILURE);
2079 }
2080
2081 _exit(EXIT_SUCCESS);
2082 } else if (pid < 0) {
2083 error_setg_errno(errp, errno, "failed to create child process");
2084 return;
2085 }
2086
2087 ga_wait_child(pid, &status, &local_err);
2088 if (local_err) {
2089 error_propagate(errp, local_err);
2090 return;
2091 }
2092
2093 if (WEXITSTATUS(status)) {
2094 error_setg(errp, "child process has failed to suspend");
2095 }
2096
2097 }
2098
2099 static void guest_suspend(SuspendMode mode, Error **errp)
2100 {
2101 Error *local_err = NULL;
2102 bool mode_supported = false;
2103
2104 if (systemd_supports_mode(mode, &local_err)) {
2105 mode_supported = true;
2106 systemd_suspend(mode, &local_err);
2107 }
2108
2109 if (!local_err) {
2110 return;
2111 }
2112
2113 error_free(local_err);
2114 local_err = NULL;
2115
2116 if (pmutils_supports_mode(mode, &local_err)) {
2117 mode_supported = true;
2118 pmutils_suspend(mode, &local_err);
2119 }
2120
2121 if (!local_err) {
2122 return;
2123 }
2124
2125 error_free(local_err);
2126 local_err = NULL;
2127
2128 if (linux_sys_state_supports_mode(mode, &local_err)) {
2129 mode_supported = true;
2130 linux_sys_state_suspend(mode, &local_err);
2131 }
2132
2133 if (!mode_supported) {
2134 error_free(local_err);
2135 error_setg(errp,
2136 "the requested suspend mode is not supported by the guest");
2137 } else {
2138 error_propagate(errp, local_err);
2139 }
2140 }
2141
2142 void qmp_guest_suspend_disk(Error **errp)
2143 {
2144 guest_suspend(SUSPEND_MODE_DISK, errp);
2145 }
2146
2147 void qmp_guest_suspend_ram(Error **errp)
2148 {
2149 guest_suspend(SUSPEND_MODE_RAM, errp);
2150 }
2151
2152 void qmp_guest_suspend_hybrid(Error **errp)
2153 {
2154 guest_suspend(SUSPEND_MODE_HYBRID, errp);
2155 }
2156
2157 static GuestNetworkInterface *
2158 guest_find_interface(GuestNetworkInterfaceList *head,
2159 const char *name)
2160 {
2161 for (; head; head = head->next) {
2162 if (strcmp(head->value->name, name) == 0) {
2163 return head->value;
2164 }
2165 }
2166
2167 return NULL;
2168 }
2169
2170 static int guest_get_network_stats(const char *name,
2171 GuestNetworkInterfaceStat *stats)
2172 {
2173 int name_len;
2174 char const *devinfo = "/proc/net/dev";
2175 FILE *fp;
2176 char *line = NULL, *colon;
2177 size_t n = 0;
2178 fp = fopen(devinfo, "r");
2179 if (!fp) {
2180 return -1;
2181 }
2182 name_len = strlen(name);
2183 while (getline(&line, &n, fp) != -1) {
2184 long long dummy;
2185 long long rx_bytes;
2186 long long rx_packets;
2187 long long rx_errs;
2188 long long rx_dropped;
2189 long long tx_bytes;
2190 long long tx_packets;
2191 long long tx_errs;
2192 long long tx_dropped;
2193 char *trim_line;
2194 trim_line = g_strchug(line);
2195 if (trim_line[0] == '\0') {
2196 continue;
2197 }
2198 colon = strchr(trim_line, ':');
2199 if (!colon) {
2200 continue;
2201 }
2202 if (colon - name_len == trim_line &&
2203 strncmp(trim_line, name, name_len) == 0) {
2204 if (sscanf(colon + 1,
2205 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
2206 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped,
2207 &dummy, &dummy, &dummy, &dummy,
2208 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped,
2209 &dummy, &dummy, &dummy, &dummy) != 16) {
2210 continue;
2211 }
2212 stats->rx_bytes = rx_bytes;
2213 stats->rx_packets = rx_packets;
2214 stats->rx_errs = rx_errs;
2215 stats->rx_dropped = rx_dropped;
2216 stats->tx_bytes = tx_bytes;
2217 stats->tx_packets = tx_packets;
2218 stats->tx_errs = tx_errs;
2219 stats->tx_dropped = tx_dropped;
2220 fclose(fp);
2221 g_free(line);
2222 return 0;
2223 }
2224 }
2225 fclose(fp);
2226 g_free(line);
2227 g_debug("/proc/net/dev: Interface '%s' not found", name);
2228 return -1;
2229 }
2230
2231 /*
2232 * Build information about guest interfaces
2233 */
2234 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2235 {
2236 GuestNetworkInterfaceList *head = NULL, **tail = &head;
2237 struct ifaddrs *ifap, *ifa;
2238
2239 if (getifaddrs(&ifap) < 0) {
2240 error_setg_errno(errp, errno, "getifaddrs failed");
2241 goto error;
2242 }
2243
2244 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
2245 GuestNetworkInterface *info;
2246 GuestIpAddressList **address_tail;
2247 GuestIpAddress *address_item = NULL;
2248 GuestNetworkInterfaceStat *interface_stat = NULL;
2249 char addr4[INET_ADDRSTRLEN];
2250 char addr6[INET6_ADDRSTRLEN];
2251 int sock;
2252 struct ifreq ifr;
2253 unsigned char *mac_addr;
2254 void *p;
2255
2256 g_debug("Processing %s interface", ifa->ifa_name);
2257
2258 info = guest_find_interface(head, ifa->ifa_name);
2259
2260 if (!info) {
2261 info = g_malloc0(sizeof(*info));
2262 info->name = g_strdup(ifa->ifa_name);
2263
2264 QAPI_LIST_APPEND(tail, info);
2265 }
2266
2267 if (!info->has_hardware_address && ifa->ifa_flags & SIOCGIFHWADDR) {
2268 /* we haven't obtained HW address yet */
2269 sock = socket(PF_INET, SOCK_STREAM, 0);
2270 if (sock == -1) {
2271 error_setg_errno(errp, errno, "failed to create socket");
2272 goto error;
2273 }
2274
2275 memset(&ifr, 0, sizeof(ifr));
2276 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->name);
2277 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
2278 error_setg_errno(errp, errno,
2279 "failed to get MAC address of %s",
2280 ifa->ifa_name);
2281 close(sock);
2282 goto error;
2283 }
2284
2285 close(sock);
2286 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
2287
2288 info->hardware_address =
2289 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
2290 (int) mac_addr[0], (int) mac_addr[1],
2291 (int) mac_addr[2], (int) mac_addr[3],
2292 (int) mac_addr[4], (int) mac_addr[5]);
2293
2294 info->has_hardware_address = true;
2295 }
2296
2297 if (ifa->ifa_addr &&
2298 ifa->ifa_addr->sa_family == AF_INET) {
2299 /* interface with IPv4 address */
2300 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
2301 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
2302 error_setg_errno(errp, errno, "inet_ntop failed");
2303 goto error;
2304 }
2305
2306 address_item = g_malloc0(sizeof(*address_item));
2307 address_item->ip_address = g_strdup(addr4);
2308 address_item->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
2309
2310 if (ifa->ifa_netmask) {
2311 /* Count the number of set bits in netmask.
2312 * This is safe as '1' and '0' cannot be shuffled in netmask. */
2313 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
2314 address_item->prefix = ctpop32(((uint32_t *) p)[0]);
2315 }
2316 } else if (ifa->ifa_addr &&
2317 ifa->ifa_addr->sa_family == AF_INET6) {
2318 /* interface with IPv6 address */
2319 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
2320 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
2321 error_setg_errno(errp, errno, "inet_ntop failed");
2322 goto error;
2323 }
2324
2325 address_item = g_malloc0(sizeof(*address_item));
2326 address_item->ip_address = g_strdup(addr6);
2327 address_item->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
2328
2329 if (ifa->ifa_netmask) {
2330 /* Count the number of set bits in netmask.
2331 * This is safe as '1' and '0' cannot be shuffled in netmask. */
2332 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
2333 address_item->prefix =
2334 ctpop32(((uint32_t *) p)[0]) +
2335 ctpop32(((uint32_t *) p)[1]) +
2336 ctpop32(((uint32_t *) p)[2]) +
2337 ctpop32(((uint32_t *) p)[3]);
2338 }
2339 }
2340
2341 if (!address_item) {
2342 continue;
2343 }
2344
2345 address_tail = &info->ip_addresses;
2346 while (*address_tail) {
2347 address_tail = &(*address_tail)->next;
2348 }
2349 QAPI_LIST_APPEND(address_tail, address_item);
2350
2351 info->has_ip_addresses = true;
2352
2353 if (!info->has_statistics) {
2354 interface_stat = g_malloc0(sizeof(*interface_stat));
2355 if (guest_get_network_stats(info->name, interface_stat) == -1) {
2356 info->has_statistics = false;
2357 g_free(interface_stat);
2358 } else {
2359 info->statistics = interface_stat;
2360 info->has_statistics = true;
2361 }
2362 }
2363 }
2364
2365 freeifaddrs(ifap);
2366 return head;
2367
2368 error:
2369 freeifaddrs(ifap);
2370 qapi_free_GuestNetworkInterfaceList(head);
2371 return NULL;
2372 }
2373
2374 /* Transfer online/offline status between @vcpu and the guest system.
2375 *
2376 * On input either @errp or *@errp must be NULL.
2377 *
2378 * In system-to-@vcpu direction, the following @vcpu fields are accessed:
2379 * - R: vcpu->logical_id
2380 * - W: vcpu->online
2381 * - W: vcpu->can_offline
2382 *
2383 * In @vcpu-to-system direction, the following @vcpu fields are accessed:
2384 * - R: vcpu->logical_id
2385 * - R: vcpu->online
2386 *
2387 * Written members remain unmodified on error.
2388 */
2389 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
2390 char *dirpath, Error **errp)
2391 {
2392 int fd;
2393 int res;
2394 int dirfd;
2395 static const char fn[] = "online";
2396
2397 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2398 if (dirfd == -1) {
2399 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2400 return;
2401 }
2402
2403 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
2404 if (fd == -1) {
2405 if (errno != ENOENT) {
2406 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
2407 } else if (sys2vcpu) {
2408 vcpu->online = true;
2409 vcpu->can_offline = false;
2410 } else if (!vcpu->online) {
2411 error_setg(errp, "logical processor #%" PRId64 " can't be "
2412 "offlined", vcpu->logical_id);
2413 } /* otherwise pretend successful re-onlining */
2414 } else {
2415 unsigned char status;
2416
2417 res = pread(fd, &status, 1, 0);
2418 if (res == -1) {
2419 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
2420 } else if (res == 0) {
2421 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
2422 fn);
2423 } else if (sys2vcpu) {
2424 vcpu->online = (status != '0');
2425 vcpu->can_offline = true;
2426 } else if (vcpu->online != (status != '0')) {
2427 status = '0' + vcpu->online;
2428 if (pwrite(fd, &status, 1, 0) == -1) {
2429 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
2430 fn);
2431 }
2432 } /* otherwise pretend successful re-(on|off)-lining */
2433
2434 res = close(fd);
2435 g_assert(res == 0);
2436 }
2437
2438 res = close(dirfd);
2439 g_assert(res == 0);
2440 }
2441
2442 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2443 {
2444 GuestLogicalProcessorList *head, **tail;
2445 const char *cpu_dir = "/sys/devices/system/cpu";
2446 const gchar *line;
2447 g_autoptr(GDir) cpu_gdir = NULL;
2448 Error *local_err = NULL;
2449
2450 head = NULL;
2451 tail = &head;
2452 cpu_gdir = g_dir_open(cpu_dir, 0, NULL);
2453
2454 if (cpu_gdir == NULL) {
2455 error_setg_errno(errp, errno, "failed to list entries: %s", cpu_dir);
2456 return NULL;
2457 }
2458
2459 while (local_err == NULL && (line = g_dir_read_name(cpu_gdir)) != NULL) {
2460 GuestLogicalProcessor *vcpu;
2461 int64_t id;
2462 if (sscanf(line, "cpu%" PRId64, &id)) {
2463 g_autofree char *path = g_strdup_printf("/sys/devices/system/cpu/"
2464 "cpu%" PRId64 "/", id);
2465 vcpu = g_malloc0(sizeof *vcpu);
2466 vcpu->logical_id = id;
2467 vcpu->has_can_offline = true; /* lolspeak ftw */
2468 transfer_vcpu(vcpu, true, path, &local_err);
2469 QAPI_LIST_APPEND(tail, vcpu);
2470 }
2471 }
2472
2473 if (local_err == NULL) {
2474 /* there's no guest with zero VCPUs */
2475 g_assert(head != NULL);
2476 return head;
2477 }
2478
2479 qapi_free_GuestLogicalProcessorList(head);
2480 error_propagate(errp, local_err);
2481 return NULL;
2482 }
2483
2484 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2485 {
2486 int64_t processed;
2487 Error *local_err = NULL;
2488
2489 processed = 0;
2490 while (vcpus != NULL) {
2491 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
2492 vcpus->value->logical_id);
2493
2494 transfer_vcpu(vcpus->value, false, path, &local_err);
2495 g_free(path);
2496 if (local_err != NULL) {
2497 break;
2498 }
2499 ++processed;
2500 vcpus = vcpus->next;
2501 }
2502
2503 if (local_err != NULL) {
2504 if (processed == 0) {
2505 error_propagate(errp, local_err);
2506 } else {
2507 error_free(local_err);
2508 }
2509 }
2510
2511 return processed;
2512 }
2513
2514 void qmp_guest_set_user_password(const char *username,
2515 const char *password,
2516 bool crypted,
2517 Error **errp)
2518 {
2519 Error *local_err = NULL;
2520 char *passwd_path = NULL;
2521 pid_t pid;
2522 int status;
2523 int datafd[2] = { -1, -1 };
2524 char *rawpasswddata = NULL;
2525 size_t rawpasswdlen;
2526 char *chpasswddata = NULL;
2527 size_t chpasswdlen;
2528
2529 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp);
2530 if (!rawpasswddata) {
2531 return;
2532 }
2533 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
2534 rawpasswddata[rawpasswdlen] = '\0';
2535
2536 if (strchr(rawpasswddata, '\n')) {
2537 error_setg(errp, "forbidden characters in raw password");
2538 goto out;
2539 }
2540
2541 if (strchr(username, '\n') ||
2542 strchr(username, ':')) {
2543 error_setg(errp, "forbidden characters in username");
2544 goto out;
2545 }
2546
2547 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
2548 chpasswdlen = strlen(chpasswddata);
2549
2550 passwd_path = g_find_program_in_path("chpasswd");
2551
2552 if (!passwd_path) {
2553 error_setg(errp, "cannot find 'passwd' program in PATH");
2554 goto out;
2555 }
2556
2557 if (pipe(datafd) < 0) {
2558 error_setg(errp, "cannot create pipe FDs");
2559 goto out;
2560 }
2561
2562 pid = fork();
2563 if (pid == 0) {
2564 close(datafd[1]);
2565 /* child */
2566 setsid();
2567 dup2(datafd[0], 0);
2568 reopen_fd_to_null(1);
2569 reopen_fd_to_null(2);
2570
2571 if (crypted) {
2572 execle(passwd_path, "chpasswd", "-e", NULL, environ);
2573 } else {
2574 execle(passwd_path, "chpasswd", NULL, environ);
2575 }
2576 _exit(EXIT_FAILURE);
2577 } else if (pid < 0) {
2578 error_setg_errno(errp, errno, "failed to create child process");
2579 goto out;
2580 }
2581 close(datafd[0]);
2582 datafd[0] = -1;
2583
2584 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
2585 error_setg_errno(errp, errno, "cannot write new account password");
2586 goto out;
2587 }
2588 close(datafd[1]);
2589 datafd[1] = -1;
2590
2591 ga_wait_child(pid, &status, &local_err);
2592 if (local_err) {
2593 error_propagate(errp, local_err);
2594 goto out;
2595 }
2596
2597 if (!WIFEXITED(status)) {
2598 error_setg(errp, "child process has terminated abnormally");
2599 goto out;
2600 }
2601
2602 if (WEXITSTATUS(status)) {
2603 error_setg(errp, "child process has failed to set user password");
2604 goto out;
2605 }
2606
2607 out:
2608 g_free(chpasswddata);
2609 g_free(rawpasswddata);
2610 g_free(passwd_path);
2611 if (datafd[0] != -1) {
2612 close(datafd[0]);
2613 }
2614 if (datafd[1] != -1) {
2615 close(datafd[1]);
2616 }
2617 }
2618
2619 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
2620 int size, Error **errp)
2621 {
2622 int fd;
2623 int res;
2624
2625 errno = 0;
2626 fd = openat(dirfd, pathname, O_RDONLY);
2627 if (fd == -1) {
2628 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2629 return;
2630 }
2631
2632 res = pread(fd, buf, size, 0);
2633 if (res == -1) {
2634 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
2635 } else if (res == 0) {
2636 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
2637 }
2638 close(fd);
2639 }
2640
2641 static void ga_write_sysfs_file(int dirfd, const char *pathname,
2642 const char *buf, int size, Error **errp)
2643 {
2644 int fd;
2645
2646 errno = 0;
2647 fd = openat(dirfd, pathname, O_WRONLY);
2648 if (fd == -1) {
2649 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2650 return;
2651 }
2652
2653 if (pwrite(fd, buf, size, 0) == -1) {
2654 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
2655 }
2656
2657 close(fd);
2658 }
2659
2660 /* Transfer online/offline status between @mem_blk and the guest system.
2661 *
2662 * On input either @errp or *@errp must be NULL.
2663 *
2664 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
2665 * - R: mem_blk->phys_index
2666 * - W: mem_blk->online
2667 * - W: mem_blk->can_offline
2668 *
2669 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
2670 * - R: mem_blk->phys_index
2671 * - R: mem_blk->online
2672 *- R: mem_blk->can_offline
2673 * Written members remain unmodified on error.
2674 */
2675 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
2676 GuestMemoryBlockResponse *result,
2677 Error **errp)
2678 {
2679 char *dirpath;
2680 int dirfd;
2681 char *status;
2682 Error *local_err = NULL;
2683
2684 if (!sys2memblk) {
2685 DIR *dp;
2686
2687 if (!result) {
2688 error_setg(errp, "Internal error, 'result' should not be NULL");
2689 return;
2690 }
2691 errno = 0;
2692 dp = opendir("/sys/devices/system/memory/");
2693 /* if there is no 'memory' directory in sysfs,
2694 * we think this VM does not support online/offline memory block,
2695 * any other solution?
2696 */
2697 if (!dp) {
2698 if (errno == ENOENT) {
2699 result->response =
2700 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2701 }
2702 goto out1;
2703 }
2704 closedir(dp);
2705 }
2706
2707 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
2708 mem_blk->phys_index);
2709 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2710 if (dirfd == -1) {
2711 if (sys2memblk) {
2712 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2713 } else {
2714 if (errno == ENOENT) {
2715 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
2716 } else {
2717 result->response =
2718 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2719 }
2720 }
2721 g_free(dirpath);
2722 goto out1;
2723 }
2724 g_free(dirpath);
2725
2726 status = g_malloc0(10);
2727 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
2728 if (local_err) {
2729 /* treat with sysfs file that not exist in old kernel */
2730 if (errno == ENOENT) {
2731 error_free(local_err);
2732 if (sys2memblk) {
2733 mem_blk->online = true;
2734 mem_blk->can_offline = false;
2735 } else if (!mem_blk->online) {
2736 result->response =
2737 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2738 }
2739 } else {
2740 if (sys2memblk) {
2741 error_propagate(errp, local_err);
2742 } else {
2743 error_free(local_err);
2744 result->response =
2745 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2746 }
2747 }
2748 goto out2;
2749 }
2750
2751 if (sys2memblk) {
2752 char removable = '0';
2753
2754 mem_blk->online = (strncmp(status, "online", 6) == 0);
2755
2756 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
2757 if (local_err) {
2758 /* if no 'removable' file, it doesn't support offline mem blk */
2759 if (errno == ENOENT) {
2760 error_free(local_err);
2761 mem_blk->can_offline = false;
2762 } else {
2763 error_propagate(errp, local_err);
2764 }
2765 } else {
2766 mem_blk->can_offline = (removable != '0');
2767 }
2768 } else {
2769 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
2770 const char *new_state = mem_blk->online ? "online" : "offline";
2771
2772 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
2773 &local_err);
2774 if (local_err) {
2775 error_free(local_err);
2776 result->response =
2777 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2778 goto out2;
2779 }
2780
2781 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
2782 result->has_error_code = false;
2783 } /* otherwise pretend successful re-(on|off)-lining */
2784 }
2785 g_free(status);
2786 close(dirfd);
2787 return;
2788
2789 out2:
2790 g_free(status);
2791 close(dirfd);
2792 out1:
2793 if (!sys2memblk) {
2794 result->has_error_code = true;
2795 result->error_code = errno;
2796 }
2797 }
2798
2799 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2800 {
2801 GuestMemoryBlockList *head, **tail;
2802 Error *local_err = NULL;
2803 struct dirent *de;
2804 DIR *dp;
2805
2806 head = NULL;
2807 tail = &head;
2808
2809 dp = opendir("/sys/devices/system/memory/");
2810 if (!dp) {
2811 /* it's ok if this happens to be a system that doesn't expose
2812 * memory blocks via sysfs, but otherwise we should report
2813 * an error
2814 */
2815 if (errno != ENOENT) {
2816 error_setg_errno(errp, errno, "Can't open directory"
2817 "\"/sys/devices/system/memory/\"");
2818 }
2819 return NULL;
2820 }
2821
2822 /* Note: the phys_index of memory block may be discontinuous,
2823 * this is because a memblk is the unit of the Sparse Memory design, which
2824 * allows discontinuous memory ranges (ex. NUMA), so here we should
2825 * traverse the memory block directory.
2826 */
2827 while ((de = readdir(dp)) != NULL) {
2828 GuestMemoryBlock *mem_blk;
2829
2830 if ((strncmp(de->d_name, "memory", 6) != 0) ||
2831 !(de->d_type & DT_DIR)) {
2832 continue;
2833 }
2834
2835 mem_blk = g_malloc0(sizeof *mem_blk);
2836 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */
2837 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
2838 mem_blk->has_can_offline = true; /* lolspeak ftw */
2839 transfer_memory_block(mem_blk, true, NULL, &local_err);
2840 if (local_err) {
2841 break;
2842 }
2843
2844 QAPI_LIST_APPEND(tail, mem_blk);
2845 }
2846
2847 closedir(dp);
2848 if (local_err == NULL) {
2849 /* there's no guest with zero memory blocks */
2850 if (head == NULL) {
2851 error_setg(errp, "guest reported zero memory blocks!");
2852 }
2853 return head;
2854 }
2855
2856 qapi_free_GuestMemoryBlockList(head);
2857 error_propagate(errp, local_err);
2858 return NULL;
2859 }
2860
2861 GuestMemoryBlockResponseList *
2862 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2863 {
2864 GuestMemoryBlockResponseList *head, **tail;
2865 Error *local_err = NULL;
2866
2867 head = NULL;
2868 tail = &head;
2869
2870 while (mem_blks != NULL) {
2871 GuestMemoryBlockResponse *result;
2872 GuestMemoryBlock *current_mem_blk = mem_blks->value;
2873
2874 result = g_malloc0(sizeof(*result));
2875 result->phys_index = current_mem_blk->phys_index;
2876 transfer_memory_block(current_mem_blk, false, result, &local_err);
2877 if (local_err) { /* should never happen */
2878 goto err;
2879 }
2880
2881 QAPI_LIST_APPEND(tail, result);
2882 mem_blks = mem_blks->next;
2883 }
2884
2885 return head;
2886 err:
2887 qapi_free_GuestMemoryBlockResponseList(head);
2888 error_propagate(errp, local_err);
2889 return NULL;
2890 }
2891
2892 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2893 {
2894 Error *local_err = NULL;
2895 char *dirpath;
2896 int dirfd;
2897 char *buf;
2898 GuestMemoryBlockInfo *info;
2899
2900 dirpath = g_strdup_printf("/sys/devices/system/memory/");
2901 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2902 if (dirfd == -1) {
2903 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2904 g_free(dirpath);
2905 return NULL;
2906 }
2907 g_free(dirpath);
2908
2909 buf = g_malloc0(20);
2910 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
2911 close(dirfd);
2912 if (local_err) {
2913 g_free(buf);
2914 error_propagate(errp, local_err);
2915 return NULL;
2916 }
2917
2918 info = g_new0(GuestMemoryBlockInfo, 1);
2919 info->size = strtol(buf, NULL, 16); /* the unit is bytes */
2920
2921 g_free(buf);
2922
2923 return info;
2924 }
2925
2926 #else /* defined(__linux__) */
2927
2928 void qmp_guest_suspend_disk(Error **errp)
2929 {
2930 error_setg(errp, QERR_UNSUPPORTED);
2931 }
2932
2933 void qmp_guest_suspend_ram(Error **errp)
2934 {
2935 error_setg(errp, QERR_UNSUPPORTED);
2936 }
2937
2938 void qmp_guest_suspend_hybrid(Error **errp)
2939 {
2940 error_setg(errp, QERR_UNSUPPORTED);
2941 }
2942
2943 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2944 {
2945 error_setg(errp, QERR_UNSUPPORTED);
2946 return NULL;
2947 }
2948
2949 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2950 {
2951 error_setg(errp, QERR_UNSUPPORTED);
2952 return NULL;
2953 }
2954
2955 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2956 {
2957 error_setg(errp, QERR_UNSUPPORTED);
2958 return -1;
2959 }
2960
2961 void qmp_guest_set_user_password(const char *username,
2962 const char *password,
2963 bool crypted,
2964 Error **errp)
2965 {
2966 error_setg(errp, QERR_UNSUPPORTED);
2967 }
2968
2969 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2970 {
2971 error_setg(errp, QERR_UNSUPPORTED);
2972 return NULL;
2973 }
2974
2975 GuestMemoryBlockResponseList *
2976 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2977 {
2978 error_setg(errp, QERR_UNSUPPORTED);
2979 return NULL;
2980 }
2981
2982 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2983 {
2984 error_setg(errp, QERR_UNSUPPORTED);
2985 return NULL;
2986 }
2987
2988 #endif
2989
2990 #if !defined(CONFIG_FSFREEZE)
2991
2992 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
2993 {
2994 error_setg(errp, QERR_UNSUPPORTED);
2995 return NULL;
2996 }
2997
2998 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
2999 {
3000 error_setg(errp, QERR_UNSUPPORTED);
3001
3002 return 0;
3003 }
3004
3005 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
3006 {
3007 error_setg(errp, QERR_UNSUPPORTED);
3008
3009 return 0;
3010 }
3011
3012 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
3013 strList *mountpoints,
3014 Error **errp)
3015 {
3016 error_setg(errp, QERR_UNSUPPORTED);
3017
3018 return 0;
3019 }
3020
3021 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
3022 {
3023 error_setg(errp, QERR_UNSUPPORTED);
3024
3025 return 0;
3026 }
3027
3028 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
3029 {
3030 error_setg(errp, QERR_UNSUPPORTED);
3031 return NULL;
3032 }
3033
3034 #endif /* CONFIG_FSFREEZE */
3035
3036 #if !defined(CONFIG_FSTRIM)
3037 GuestFilesystemTrimResponse *
3038 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
3039 {
3040 error_setg(errp, QERR_UNSUPPORTED);
3041 return NULL;
3042 }
3043 #endif
3044
3045 /* add unsupported commands to the blacklist */
3046 GList *ga_command_blacklist_init(GList *blacklist)
3047 {
3048 #if !defined(__linux__)
3049 {
3050 const char *list[] = {
3051 "guest-suspend-disk", "guest-suspend-ram",
3052 "guest-suspend-hybrid", "guest-network-get-interfaces",
3053 "guest-get-vcpus", "guest-set-vcpus",
3054 "guest-get-memory-blocks", "guest-set-memory-blocks",
3055 "guest-get-memory-block-size", "guest-get-memory-block-info",
3056 NULL};
3057 char **p = (char **)list;
3058
3059 while (*p) {
3060 blacklist = g_list_append(blacklist, g_strdup(*p++));
3061 }
3062 }
3063 #endif
3064
3065 #if !defined(CONFIG_FSFREEZE)
3066 {
3067 const char *list[] = {
3068 "guest-get-fsinfo", "guest-fsfreeze-status",
3069 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
3070 "guest-fsfreeze-thaw", "guest-get-fsinfo",
3071 "guest-get-disks", NULL};
3072 char **p = (char **)list;
3073
3074 while (*p) {
3075 blacklist = g_list_append(blacklist, g_strdup(*p++));
3076 }
3077 }
3078 #endif
3079
3080 #if !defined(CONFIG_FSTRIM)
3081 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim"));
3082 #endif
3083
3084 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices"));
3085
3086 return blacklist;
3087 }
3088
3089 /* register init/cleanup routines for stateful command groups */
3090 void ga_command_state_init(GAState *s, GACommandState *cs)
3091 {
3092 #if defined(CONFIG_FSFREEZE)
3093 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
3094 #endif
3095 }
3096
3097 #ifdef HAVE_UTMPX
3098
3099 #define QGA_MICRO_SECOND_TO_SECOND 1000000
3100
3101 static double ga_get_login_time(struct utmpx *user_info)
3102 {
3103 double seconds = (double)user_info->ut_tv.tv_sec;
3104 double useconds = (double)user_info->ut_tv.tv_usec;
3105 useconds /= QGA_MICRO_SECOND_TO_SECOND;
3106 return seconds + useconds;
3107 }
3108
3109 GuestUserList *qmp_guest_get_users(Error **errp)
3110 {
3111 GHashTable *cache = NULL;
3112 GuestUserList *head = NULL, **tail = &head;
3113 struct utmpx *user_info = NULL;
3114 gpointer value = NULL;
3115 GuestUser *user = NULL;
3116 double login_time = 0;
3117
3118 cache = g_hash_table_new(g_str_hash, g_str_equal);
3119 setutxent();
3120
3121 for (;;) {
3122 user_info = getutxent();
3123 if (user_info == NULL) {
3124 break;
3125 } else if (user_info->ut_type != USER_PROCESS) {
3126 continue;
3127 } else if (g_hash_table_contains(cache, user_info->ut_user)) {
3128 value = g_hash_table_lookup(cache, user_info->ut_user);
3129 user = (GuestUser *)value;
3130 login_time = ga_get_login_time(user_info);
3131 /* We're ensuring the earliest login time to be sent */
3132 if (login_time < user->login_time) {
3133 user->login_time = login_time;
3134 }
3135 continue;
3136 }
3137
3138 user = g_new0(GuestUser, 1);
3139 user->user = g_strdup(user_info->ut_user);
3140 user->login_time = ga_get_login_time(user_info);
3141
3142 g_hash_table_insert(cache, user->user, user);
3143
3144 QAPI_LIST_APPEND(tail, user);
3145 }
3146 endutxent();
3147 g_hash_table_destroy(cache);
3148 return head;
3149 }
3150
3151 #else
3152
3153 GuestUserList *qmp_guest_get_users(Error **errp)
3154 {
3155 error_setg(errp, QERR_UNSUPPORTED);
3156 return NULL;
3157 }
3158
3159 #endif
3160
3161 /* Replace escaped special characters with theire real values. The replacement
3162 * is done in place -- returned value is in the original string.
3163 */
3164 static void ga_osrelease_replace_special(gchar *value)
3165 {
3166 gchar *p, *p2, quote;
3167
3168 /* Trim the string at first space or semicolon if it is not enclosed in
3169 * single or double quotes. */
3170 if ((value[0] != '"') || (value[0] == '\'')) {
3171 p = strchr(value, ' ');
3172 if (p != NULL) {
3173 *p = 0;
3174 }
3175 p = strchr(value, ';');
3176 if (p != NULL) {
3177 *p = 0;
3178 }
3179 return;
3180 }
3181
3182 quote = value[0];
3183 p2 = value;
3184 p = value + 1;
3185 while (*p != 0) {
3186 if (*p == '\\') {
3187 p++;
3188 switch (*p) {
3189 case '$':
3190 case '\'':
3191 case '"':
3192 case '\\':
3193 case '`':
3194 break;
3195 default:
3196 /* Keep literal backslash followed by whatever is there */
3197 p--;
3198 break;
3199 }
3200 } else if (*p == quote) {
3201 *p2 = 0;
3202 break;
3203 }
3204 *(p2++) = *(p++);
3205 }
3206 }
3207
3208 static GKeyFile *ga_parse_osrelease(const char *fname)
3209 {
3210 gchar *content = NULL;
3211 gchar *content2 = NULL;
3212 GError *err = NULL;
3213 GKeyFile *keys = g_key_file_new();
3214 const char *group = "[os-release]\n";
3215
3216 if (!g_file_get_contents(fname, &content, NULL, &err)) {
3217 slog("failed to read '%s', error: %s", fname, err->message);
3218 goto fail;
3219 }
3220
3221 if (!g_utf8_validate(content, -1, NULL)) {
3222 slog("file is not utf-8 encoded: %s", fname);
3223 goto fail;
3224 }
3225 content2 = g_strdup_printf("%s%s", group, content);
3226
3227 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE,
3228 &err)) {
3229 slog("failed to parse file '%s', error: %s", fname, err->message);
3230 goto fail;
3231 }
3232
3233 g_free(content);
3234 g_free(content2);
3235 return keys;
3236
3237 fail:
3238 g_error_free(err);
3239 g_free(content);
3240 g_free(content2);
3241 g_key_file_free(keys);
3242 return NULL;
3243 }
3244
3245 GuestOSInfo *qmp_guest_get_osinfo(Error **errp)
3246 {
3247 GuestOSInfo *info = NULL;
3248 struct utsname kinfo;
3249 GKeyFile *osrelease = NULL;
3250 const char *qga_os_release = g_getenv("QGA_OS_RELEASE");
3251
3252 info = g_new0(GuestOSInfo, 1);
3253
3254 if (uname(&kinfo) != 0) {
3255 error_setg_errno(errp, errno, "uname failed");
3256 } else {
3257 info->has_kernel_version = true;
3258 info->kernel_version = g_strdup(kinfo.version);
3259 info->has_kernel_release = true;
3260 info->kernel_release = g_strdup(kinfo.release);
3261 info->has_machine = true;
3262 info->machine = g_strdup(kinfo.machine);
3263 }
3264
3265 if (qga_os_release != NULL) {
3266 osrelease = ga_parse_osrelease(qga_os_release);
3267 } else {
3268 osrelease = ga_parse_osrelease("/etc/os-release");
3269 if (osrelease == NULL) {
3270 osrelease = ga_parse_osrelease("/usr/lib/os-release");
3271 }
3272 }
3273
3274 if (osrelease != NULL) {
3275 char *value;
3276
3277 #define GET_FIELD(field, osfield) do { \
3278 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \
3279 if (value != NULL) { \
3280 ga_osrelease_replace_special(value); \
3281 info->has_ ## field = true; \
3282 info->field = value; \
3283 } \
3284 } while (0)
3285 GET_FIELD(id, "ID");
3286 GET_FIELD(name, "NAME");
3287 GET_FIELD(pretty_name, "PRETTY_NAME");
3288 GET_FIELD(version, "VERSION");
3289 GET_FIELD(version_id, "VERSION_ID");
3290 GET_FIELD(variant, "VARIANT");
3291 GET_FIELD(variant_id, "VARIANT_ID");
3292 #undef GET_FIELD
3293
3294 g_key_file_free(osrelease);
3295 }
3296
3297 return info;
3298 }
3299
3300 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
3301 {
3302 error_setg(errp, QERR_UNSUPPORTED);
3303
3304 return NULL;
3305 }