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Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2020-12-19' into staging
[qemu/ar7.git] / qga / commands-posix.c
blob849923b260d7dded7fb3fb5e3524938da9c3fab3
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 /* Store disk device info specified by @sysfs into @fs */
1033 static void build_guest_fsinfo_for_real_device(char const *syspath,
1034 GuestFilesystemInfo *fs,
1035 Error **errp)
1036 {
1037 GuestDiskAddress *disk;
1038 GuestPCIAddress *pciaddr;
1039 bool has_hwinf;
1040 #ifdef CONFIG_LIBUDEV
1041 struct udev *udev = NULL;
1042 struct udev_device *udevice = NULL;
1043 #endif
1044
1045 pciaddr = g_new0(GuestPCIAddress, 1);
1046 pciaddr->domain = -1; /* -1 means field is invalid */
1047 pciaddr->bus = -1;
1048 pciaddr->slot = -1;
1049 pciaddr->function = -1;
1050
1051 disk = g_new0(GuestDiskAddress, 1);
1052 disk->pci_controller = pciaddr;
1053 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN;
1054
1055 #ifdef CONFIG_LIBUDEV
1056 udev = udev_new();
1057 udevice = udev_device_new_from_syspath(udev, syspath);
1058 if (udev == NULL || udevice == NULL) {
1059 g_debug("failed to query udev");
1060 } else {
1061 const char *devnode, *serial;
1062 devnode = udev_device_get_devnode(udevice);
1063 if (devnode != NULL) {
1064 disk->dev = g_strdup(devnode);
1065 disk->has_dev = true;
1066 }
1067 serial = udev_device_get_property_value(udevice, "ID_SERIAL");
1068 if (serial != NULL && *serial != 0) {
1069 disk->serial = g_strdup(serial);
1070 disk->has_serial = true;
1071 }
1072 }
1073
1074 udev_unref(udev);
1075 udev_device_unref(udevice);
1076 #endif
1077
1078 if (strstr(syspath, "/devices/pci")) {
1079 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
1080 } else if (strstr(syspath, "/virtio")) {
1081 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
1082 } else {
1083 g_debug("Unsupported device type for '%s'", syspath);
1084 has_hwinf = false;
1085 }
1086
1087 if (has_hwinf || disk->has_dev || disk->has_serial) {
1088 QAPI_LIST_PREPEND(fs->disk, disk);
1089 } else {
1090 qapi_free_GuestDiskAddress(disk);
1091 }
1092 }
1093
1094 static void build_guest_fsinfo_for_device(char const *devpath,
1095 GuestFilesystemInfo *fs,
1096 Error **errp);
1097
1098 /* Store a list of slave devices of virtual volume specified by @syspath into
1099 * @fs */
1100 static void build_guest_fsinfo_for_virtual_device(char const *syspath,
1101 GuestFilesystemInfo *fs,
1102 Error **errp)
1103 {
1104 Error *err = NULL;
1105 DIR *dir;
1106 char *dirpath;
1107 struct dirent *entry;
1108
1109 dirpath = g_strdup_printf("%s/slaves", syspath);
1110 dir = opendir(dirpath);
1111 if (!dir) {
1112 if (errno != ENOENT) {
1113 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
1114 }
1115 g_free(dirpath);
1116 return;
1117 }
1118
1119 for (;;) {
1120 errno = 0;
1121 entry = readdir(dir);
1122 if (entry == NULL) {
1123 if (errno) {
1124 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
1125 }
1126 break;
1127 }
1128
1129 if (entry->d_type == DT_LNK) {
1130 char *path;
1131
1132 g_debug(" slave device '%s'", entry->d_name);
1133 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
1134 build_guest_fsinfo_for_device(path, fs, &err);
1135 g_free(path);
1136
1137 if (err) {
1138 error_propagate(errp, err);
1139 break;
1140 }
1141 }
1142 }
1143
1144 g_free(dirpath);
1145 closedir(dir);
1146 }
1147
1148 static bool is_disk_virtual(const char *devpath, Error **errp)
1149 {
1150 g_autofree char *syspath = realpath(devpath, NULL);
1151
1152 if (!syspath) {
1153 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1154 return false;
1155 }
1156 return strstr(syspath, "/devices/virtual/block/") != NULL;
1157 }
1158
1159 /* Dispatch to functions for virtual/real device */
1160 static void build_guest_fsinfo_for_device(char const *devpath,
1161 GuestFilesystemInfo *fs,
1162 Error **errp)
1163 {
1164 ERRP_GUARD();
1165 g_autofree char *syspath = NULL;
1166 bool is_virtual = false;
1167
1168 syspath = realpath(devpath, NULL);
1169 if (!syspath) {
1170 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1171 return;
1172 }
1173
1174 if (!fs->name) {
1175 fs->name = g_path_get_basename(syspath);
1176 }
1177
1178 g_debug(" parse sysfs path '%s'", syspath);
1179 is_virtual = is_disk_virtual(syspath, errp);
1180 if (*errp != NULL) {
1181 return;
1182 }
1183 if (is_virtual) {
1184 build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
1185 } else {
1186 build_guest_fsinfo_for_real_device(syspath, fs, errp);
1187 }
1188 }
1189
1190 #ifdef CONFIG_LIBUDEV
1191
1192 /*
1193 * Wrapper around build_guest_fsinfo_for_device() for getting just
1194 * the disk address.
1195 */
1196 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp)
1197 {
1198 g_autoptr(GuestFilesystemInfo) fs = NULL;
1199
1200 fs = g_new0(GuestFilesystemInfo, 1);
1201 build_guest_fsinfo_for_device(syspath, fs, errp);
1202 if (fs->disk != NULL) {
1203 return g_steal_pointer(&fs->disk->value);
1204 }
1205 return NULL;
1206 }
1207
1208 static char *get_alias_for_syspath(const char *syspath)
1209 {
1210 struct udev *udev = NULL;
1211 struct udev_device *udevice = NULL;
1212 char *ret = NULL;
1213
1214 udev = udev_new();
1215 if (udev == NULL) {
1216 g_debug("failed to query udev");
1217 goto out;
1218 }
1219 udevice = udev_device_new_from_syspath(udev, syspath);
1220 if (udevice == NULL) {
1221 g_debug("failed to query udev for path: %s", syspath);
1222 goto out;
1223 } else {
1224 const char *alias = udev_device_get_property_value(
1225 udevice, "DM_NAME");
1226 /*
1227 * NULL means there was an error and empty string means there is no
1228 * alias. In case of no alias we return NULL instead of empty string.
1229 */
1230 if (alias == NULL) {
1231 g_debug("failed to query udev for device alias for: %s",
1232 syspath);
1233 } else if (*alias != 0) {
1234 ret = g_strdup(alias);
1235 }
1236 }
1237
1238 out:
1239 udev_unref(udev);
1240 udev_device_unref(udevice);
1241 return ret;
1242 }
1243
1244 static char *get_device_for_syspath(const char *syspath)
1245 {
1246 struct udev *udev = NULL;
1247 struct udev_device *udevice = NULL;
1248 char *ret = NULL;
1249
1250 udev = udev_new();
1251 if (udev == NULL) {
1252 g_debug("failed to query udev");
1253 goto out;
1254 }
1255 udevice = udev_device_new_from_syspath(udev, syspath);
1256 if (udevice == NULL) {
1257 g_debug("failed to query udev for path: %s", syspath);
1258 goto out;
1259 } else {
1260 ret = g_strdup(udev_device_get_devnode(udevice));
1261 }
1262
1263 out:
1264 udev_unref(udev);
1265 udev_device_unref(udevice);
1266 return ret;
1267 }
1268
1269 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk)
1270 {
1271 g_autofree char *deps_dir = NULL;
1272 const gchar *dep;
1273 GDir *dp_deps = NULL;
1274
1275 /* List dependent disks */
1276 deps_dir = g_strdup_printf("%s/slaves", disk_dir);
1277 g_debug(" listing entries in: %s", deps_dir);
1278 dp_deps = g_dir_open(deps_dir, 0, NULL);
1279 if (dp_deps == NULL) {
1280 g_debug("failed to list entries in %s", deps_dir);
1281 return;
1282 }
1283 disk->has_dependencies = true;
1284 while ((dep = g_dir_read_name(dp_deps)) != NULL) {
1285 g_autofree char *dep_dir = NULL;
1286 char *dev_name;
1287
1288 /* Add dependent disks */
1289 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep);
1290 dev_name = get_device_for_syspath(dep_dir);
1291 if (dev_name != NULL) {
1292 g_debug(" adding dependent device: %s", dev_name);
1293 QAPI_LIST_PREPEND(disk->dependencies, dev_name);
1294 }
1295 }
1296 g_dir_close(dp_deps);
1297 }
1298
1299 /*
1300 * Detect partitions subdirectory, name is "<disk_name><number>" or
1301 * "<disk_name>p<number>"
1302 *
1303 * @disk_name -- last component of /sys path (e.g. sda)
1304 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda)
1305 * @disk_dev -- device node of the disk (e.g. /dev/sda)
1306 */
1307 static GuestDiskInfoList *get_disk_partitions(
1308 GuestDiskInfoList *list,
1309 const char *disk_name, const char *disk_dir,
1310 const char *disk_dev)
1311 {
1312 GuestDiskInfoList *ret = list;
1313 struct dirent *de_disk;
1314 DIR *dp_disk = NULL;
1315 size_t len = strlen(disk_name);
1316
1317 dp_disk = opendir(disk_dir);
1318 while ((de_disk = readdir(dp_disk)) != NULL) {
1319 g_autofree char *partition_dir = NULL;
1320 char *dev_name;
1321 GuestDiskInfo *partition;
1322
1323 if (!(de_disk->d_type & DT_DIR)) {
1324 continue;
1325 }
1326
1327 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 &&
1328 ((*(de_disk->d_name + len) == 'p' &&
1329 isdigit(*(de_disk->d_name + len + 1))) ||
1330 isdigit(*(de_disk->d_name + len))))) {
1331 continue;
1332 }
1333
1334 partition_dir = g_strdup_printf("%s/%s",
1335 disk_dir, de_disk->d_name);
1336 dev_name = get_device_for_syspath(partition_dir);
1337 if (dev_name == NULL) {
1338 g_debug("Failed to get device name for syspath: %s",
1339 disk_dir);
1340 continue;
1341 }
1342 partition = g_new0(GuestDiskInfo, 1);
1343 partition->name = dev_name;
1344 partition->partition = true;
1345 /* Add parent disk as dependent for easier tracking of hierarchy */
1346 QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev));
1347
1348 QAPI_LIST_PREPEND(ret, partition);
1349 }
1350 closedir(dp_disk);
1351
1352 return ret;
1353 }
1354
1355 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1356 {
1357 GuestDiskInfoList *ret = NULL;
1358 GuestDiskInfo *disk;
1359 DIR *dp = NULL;
1360 struct dirent *de = NULL;
1361
1362 g_debug("listing /sys/block directory");
1363 dp = opendir("/sys/block");
1364 if (dp == NULL) {
1365 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\"");
1366 return NULL;
1367 }
1368 while ((de = readdir(dp)) != NULL) {
1369 g_autofree char *disk_dir = NULL, *line = NULL,
1370 *size_path = NULL;
1371 char *dev_name;
1372 Error *local_err = NULL;
1373 if (de->d_type != DT_LNK) {
1374 g_debug(" skipping entry: %s", de->d_name);
1375 continue;
1376 }
1377
1378 /* Check size and skip zero-sized disks */
1379 g_debug(" checking disk size");
1380 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name);
1381 if (!g_file_get_contents(size_path, &line, NULL, NULL)) {
1382 g_debug(" failed to read disk size");
1383 continue;
1384 }
1385 if (g_strcmp0(line, "0\n") == 0) {
1386 g_debug(" skipping zero-sized disk");
1387 continue;
1388 }
1389
1390 g_debug(" adding %s", de->d_name);
1391 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name);
1392 dev_name = get_device_for_syspath(disk_dir);
1393 if (dev_name == NULL) {
1394 g_debug("Failed to get device name for syspath: %s",
1395 disk_dir);
1396 continue;
1397 }
1398 disk = g_new0(GuestDiskInfo, 1);
1399 disk->name = dev_name;
1400 disk->partition = false;
1401 disk->alias = get_alias_for_syspath(disk_dir);
1402 disk->has_alias = (disk->alias != NULL);
1403 QAPI_LIST_PREPEND(ret, disk);
1404
1405 /* Get address for non-virtual devices */
1406 bool is_virtual = is_disk_virtual(disk_dir, &local_err);
1407 if (local_err != NULL) {
1408 g_debug(" failed to check disk path, ignoring error: %s",
1409 error_get_pretty(local_err));
1410 error_free(local_err);
1411 local_err = NULL;
1412 /* Don't try to get the address */
1413 is_virtual = true;
1414 }
1415 if (!is_virtual) {
1416 disk->address = get_disk_address(disk_dir, &local_err);
1417 if (local_err != NULL) {
1418 g_debug(" failed to get device info, ignoring error: %s",
1419 error_get_pretty(local_err));
1420 error_free(local_err);
1421 local_err = NULL;
1422 } else if (disk->address != NULL) {
1423 disk->has_address = true;
1424 }
1425 }
1426
1427 get_disk_deps(disk_dir, disk);
1428 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name);
1429 }
1430
1431 closedir(dp);
1432
1433 return ret;
1434 }
1435
1436 #else
1437
1438 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1439 {
1440 error_setg(errp, QERR_UNSUPPORTED);
1441 return NULL;
1442 }
1443
1444 #endif
1445
1446 /* Return a list of the disk device(s)' info which @mount lies on */
1447 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
1448 Error **errp)
1449 {
1450 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
1451 struct statvfs buf;
1452 unsigned long used, nonroot_total, fr_size;
1453 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
1454 mount->devmajor, mount->devminor);
1455
1456 fs->mountpoint = g_strdup(mount->dirname);
1457 fs->type = g_strdup(mount->devtype);
1458 build_guest_fsinfo_for_device(devpath, fs, errp);
1459
1460 if (statvfs(fs->mountpoint, &buf) == 0) {
1461 fr_size = buf.f_frsize;
1462 used = buf.f_blocks - buf.f_bfree;
1463 nonroot_total = used + buf.f_bavail;
1464 fs->used_bytes = used * fr_size;
1465 fs->total_bytes = nonroot_total * fr_size;
1466
1467 fs->has_total_bytes = true;
1468 fs->has_used_bytes = true;
1469 }
1470
1471 g_free(devpath);
1472
1473 return fs;
1474 }
1475
1476 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
1477 {
1478 FsMountList mounts;
1479 struct FsMount *mount;
1480 GuestFilesystemInfoList *ret = NULL;
1481 Error *local_err = NULL;
1482
1483 QTAILQ_INIT(&mounts);
1484 build_fs_mount_list(&mounts, &local_err);
1485 if (local_err) {
1486 error_propagate(errp, local_err);
1487 return NULL;
1488 }
1489
1490 QTAILQ_FOREACH(mount, &mounts, next) {
1491 g_debug("Building guest fsinfo for '%s'", mount->dirname);
1492
1493 QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err));
1494 if (local_err) {
1495 error_propagate(errp, local_err);
1496 qapi_free_GuestFilesystemInfoList(ret);
1497 ret = NULL;
1498 break;
1499 }
1500 }
1501
1502 free_fs_mount_list(&mounts);
1503 return ret;
1504 }
1505
1506
1507 typedef enum {
1508 FSFREEZE_HOOK_THAW = 0,
1509 FSFREEZE_HOOK_FREEZE,
1510 } FsfreezeHookArg;
1511
1512 static const char *fsfreeze_hook_arg_string[] = {
1513 "thaw",
1514 "freeze",
1515 };
1516
1517 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
1518 {
1519 int status;
1520 pid_t pid;
1521 const char *hook;
1522 const char *arg_str = fsfreeze_hook_arg_string[arg];
1523 Error *local_err = NULL;
1524
1525 hook = ga_fsfreeze_hook(ga_state);
1526 if (!hook) {
1527 return;
1528 }
1529 if (access(hook, X_OK) != 0) {
1530 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
1531 return;
1532 }
1533
1534 slog("executing fsfreeze hook with arg '%s'", arg_str);
1535 pid = fork();
1536 if (pid == 0) {
1537 setsid();
1538 reopen_fd_to_null(0);
1539 reopen_fd_to_null(1);
1540 reopen_fd_to_null(2);
1541
1542 execle(hook, hook, arg_str, NULL, environ);
1543 _exit(EXIT_FAILURE);
1544 } else if (pid < 0) {
1545 error_setg_errno(errp, errno, "failed to create child process");
1546 return;
1547 }
1548
1549 ga_wait_child(pid, &status, &local_err);
1550 if (local_err) {
1551 error_propagate(errp, local_err);
1552 return;
1553 }
1554
1555 if (!WIFEXITED(status)) {
1556 error_setg(errp, "fsfreeze hook has terminated abnormally");
1557 return;
1558 }
1559
1560 status = WEXITSTATUS(status);
1561 if (status) {
1562 error_setg(errp, "fsfreeze hook has failed with status %d", status);
1563 return;
1564 }
1565 }
1566
1567 /*
1568 * Return status of freeze/thaw
1569 */
1570 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1571 {
1572 if (ga_is_frozen(ga_state)) {
1573 return GUEST_FSFREEZE_STATUS_FROZEN;
1574 }
1575
1576 return GUEST_FSFREEZE_STATUS_THAWED;
1577 }
1578
1579 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1580 {
1581 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
1582 }
1583
1584 /*
1585 * Walk list of mounted file systems in the guest, and freeze the ones which
1586 * are real local file systems.
1587 */
1588 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1589 strList *mountpoints,
1590 Error **errp)
1591 {
1592 int ret = 0, i = 0;
1593 strList *list;
1594 FsMountList mounts;
1595 struct FsMount *mount;
1596 Error *local_err = NULL;
1597 int fd;
1598
1599 slog("guest-fsfreeze called");
1600
1601 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
1602 if (local_err) {
1603 error_propagate(errp, local_err);
1604 return -1;
1605 }
1606
1607 QTAILQ_INIT(&mounts);
1608 build_fs_mount_list(&mounts, &local_err);
1609 if (local_err) {
1610 error_propagate(errp, local_err);
1611 return -1;
1612 }
1613
1614 /* cannot risk guest agent blocking itself on a write in this state */
1615 ga_set_frozen(ga_state);
1616
1617 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) {
1618 /* To issue fsfreeze in the reverse order of mounts, check if the
1619 * mount is listed in the list here */
1620 if (has_mountpoints) {
1621 for (list = mountpoints; list; list = list->next) {
1622 if (strcmp(list->value, mount->dirname) == 0) {
1623 break;
1624 }
1625 }
1626 if (!list) {
1627 continue;
1628 }
1629 }
1630
1631 fd = qemu_open_old(mount->dirname, O_RDONLY);
1632 if (fd == -1) {
1633 error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
1634 goto error;
1635 }
1636
1637 /* we try to cull filesystems we know won't work in advance, but other
1638 * filesystems may not implement fsfreeze for less obvious reasons.
1639 * these will report EOPNOTSUPP. we simply ignore these when tallying
1640 * the number of frozen filesystems.
1641 * if a filesystem is mounted more than once (aka bind mount) a
1642 * consecutive attempt to freeze an already frozen filesystem will
1643 * return EBUSY.
1644 *
1645 * any other error means a failure to freeze a filesystem we
1646 * expect to be freezable, so return an error in those cases
1647 * and return system to thawed state.
1648 */
1649 ret = ioctl(fd, FIFREEZE);
1650 if (ret == -1) {
1651 if (errno != EOPNOTSUPP && errno != EBUSY) {
1652 error_setg_errno(errp, errno, "failed to freeze %s",
1653 mount->dirname);
1654 close(fd);
1655 goto error;
1656 }
1657 } else {
1658 i++;
1659 }
1660 close(fd);
1661 }
1662
1663 free_fs_mount_list(&mounts);
1664 /* We may not issue any FIFREEZE here.
1665 * Just unset ga_state here and ready for the next call.
1666 */
1667 if (i == 0) {
1668 ga_unset_frozen(ga_state);
1669 }
1670 return i;
1671
1672 error:
1673 free_fs_mount_list(&mounts);
1674 qmp_guest_fsfreeze_thaw(NULL);
1675 return 0;
1676 }
1677
1678 /*
1679 * Walk list of frozen file systems in the guest, and thaw them.
1680 */
1681 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1682 {
1683 int ret;
1684 FsMountList mounts;
1685 FsMount *mount;
1686 int fd, i = 0, logged;
1687 Error *local_err = NULL;
1688
1689 QTAILQ_INIT(&mounts);
1690 build_fs_mount_list(&mounts, &local_err);
1691 if (local_err) {
1692 error_propagate(errp, local_err);
1693 return 0;
1694 }
1695
1696 QTAILQ_FOREACH(mount, &mounts, next) {
1697 logged = false;
1698 fd = qemu_open_old(mount->dirname, O_RDONLY);
1699 if (fd == -1) {
1700 continue;
1701 }
1702 /* we have no way of knowing whether a filesystem was actually unfrozen
1703 * as a result of a successful call to FITHAW, only that if an error
1704 * was returned the filesystem was *not* unfrozen by that particular
1705 * call.
1706 *
1707 * since multiple preceding FIFREEZEs require multiple calls to FITHAW
1708 * to unfreeze, continuing issuing FITHAW until an error is returned,
1709 * in which case either the filesystem is in an unfreezable state, or,
1710 * more likely, it was thawed previously (and remains so afterward).
1711 *
1712 * also, since the most recent successful call is the one that did
1713 * the actual unfreeze, we can use this to provide an accurate count
1714 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
1715 * may * be useful for determining whether a filesystem was unfrozen
1716 * during the freeze/thaw phase by a process other than qemu-ga.
1717 */
1718 do {
1719 ret = ioctl(fd, FITHAW);
1720 if (ret == 0 && !logged) {
1721 i++;
1722 logged = true;
1723 }
1724 } while (ret == 0);
1725 close(fd);
1726 }
1727
1728 ga_unset_frozen(ga_state);
1729 free_fs_mount_list(&mounts);
1730
1731 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
1732
1733 return i;
1734 }
1735
1736 static void guest_fsfreeze_cleanup(void)
1737 {
1738 Error *err = NULL;
1739
1740 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
1741 qmp_guest_fsfreeze_thaw(&err);
1742 if (err) {
1743 slog("failed to clean up frozen filesystems: %s",
1744 error_get_pretty(err));
1745 error_free(err);
1746 }
1747 }
1748 }
1749 #endif /* CONFIG_FSFREEZE */
1750
1751 #if defined(CONFIG_FSTRIM)
1752 /*
1753 * Walk list of mounted file systems in the guest, and trim them.
1754 */
1755 GuestFilesystemTrimResponse *
1756 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1757 {
1758 GuestFilesystemTrimResponse *response;
1759 GuestFilesystemTrimResult *result;
1760 int ret = 0;
1761 FsMountList mounts;
1762 struct FsMount *mount;
1763 int fd;
1764 Error *local_err = NULL;
1765 struct fstrim_range r;
1766
1767 slog("guest-fstrim called");
1768
1769 QTAILQ_INIT(&mounts);
1770 build_fs_mount_list(&mounts, &local_err);
1771 if (local_err) {
1772 error_propagate(errp, local_err);
1773 return NULL;
1774 }
1775
1776 response = g_malloc0(sizeof(*response));
1777
1778 QTAILQ_FOREACH(mount, &mounts, next) {
1779 result = g_malloc0(sizeof(*result));
1780 result->path = g_strdup(mount->dirname);
1781
1782 QAPI_LIST_PREPEND(response->paths, result);
1783
1784 fd = qemu_open_old(mount->dirname, O_RDONLY);
1785 if (fd == -1) {
1786 result->error = g_strdup_printf("failed to open: %s",
1787 strerror(errno));
1788 result->has_error = true;
1789 continue;
1790 }
1791
1792 /* We try to cull filesystems we know won't work in advance, but other
1793 * filesystems may not implement fstrim for less obvious reasons.
1794 * These will report EOPNOTSUPP; while in some other cases ENOTTY
1795 * will be reported (e.g. CD-ROMs).
1796 * Any other error means an unexpected error.
1797 */
1798 r.start = 0;
1799 r.len = -1;
1800 r.minlen = has_minimum ? minimum : 0;
1801 ret = ioctl(fd, FITRIM, &r);
1802 if (ret == -1) {
1803 result->has_error = true;
1804 if (errno == ENOTTY || errno == EOPNOTSUPP) {
1805 result->error = g_strdup("trim not supported");
1806 } else {
1807 result->error = g_strdup_printf("failed to trim: %s",
1808 strerror(errno));
1809 }
1810 close(fd);
1811 continue;
1812 }
1813
1814 result->has_minimum = true;
1815 result->minimum = r.minlen;
1816 result->has_trimmed = true;
1817 result->trimmed = r.len;
1818 close(fd);
1819 }
1820
1821 free_fs_mount_list(&mounts);
1822 return response;
1823 }
1824 #endif /* CONFIG_FSTRIM */
1825
1826
1827 #define LINUX_SYS_STATE_FILE "/sys/power/state"
1828 #define SUSPEND_SUPPORTED 0
1829 #define SUSPEND_NOT_SUPPORTED 1
1830
1831 typedef enum {
1832 SUSPEND_MODE_DISK = 0,
1833 SUSPEND_MODE_RAM = 1,
1834 SUSPEND_MODE_HYBRID = 2,
1835 } SuspendMode;
1836
1837 /*
1838 * Executes a command in a child process using g_spawn_sync,
1839 * returning an int >= 0 representing the exit status of the
1840 * process.
1841 *
1842 * If the program wasn't found in path, returns -1.
1843 *
1844 * If a problem happened when creating the child process,
1845 * returns -1 and errp is set.
1846 */
1847 static int run_process_child(const char *command[], Error **errp)
1848 {
1849 int exit_status, spawn_flag;
1850 GError *g_err = NULL;
1851 bool success;
1852
1853 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL |
1854 G_SPAWN_STDERR_TO_DEV_NULL;
1855
1856 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag,
1857 NULL, NULL, NULL, NULL,
1858 &exit_status, &g_err);
1859
1860 if (success) {
1861 return WEXITSTATUS(exit_status);
1862 }
1863
1864 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) {
1865 error_setg(errp, "failed to create child process, error '%s'",
1866 g_err->message);
1867 }
1868
1869 g_error_free(g_err);
1870 return -1;
1871 }
1872
1873 static bool systemd_supports_mode(SuspendMode mode, Error **errp)
1874 {
1875 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend",
1876 "systemd-hybrid-sleep"};
1877 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL};
1878 int status;
1879
1880 status = run_process_child(cmd, errp);
1881
1882 /*
1883 * systemctl status uses LSB return codes so we can expect
1884 * status > 0 and be ok. To assert if the guest has support
1885 * for the selected suspend mode, status should be < 4. 4 is
1886 * the code for unknown service status, the return value when
1887 * the service does not exist. A common value is status = 3
1888 * (program is not running).
1889 */
1890 if (status > 0 && status < 4) {
1891 return true;
1892 }
1893
1894 return false;
1895 }
1896
1897 static void systemd_suspend(SuspendMode mode, Error **errp)
1898 {
1899 Error *local_err = NULL;
1900 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"};
1901 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL};
1902 int status;
1903
1904 status = run_process_child(cmd, &local_err);
1905
1906 if (status == 0) {
1907 return;
1908 }
1909
1910 if ((status == -1) && !local_err) {
1911 error_setg(errp, "the helper program 'systemctl %s' was not found",
1912 systemctl_args[mode]);
1913 return;
1914 }
1915
1916 if (local_err) {
1917 error_propagate(errp, local_err);
1918 } else {
1919 error_setg(errp, "the helper program 'systemctl %s' returned an "
1920 "unexpected exit status code (%d)",
1921 systemctl_args[mode], status);
1922 }
1923 }
1924
1925 static bool pmutils_supports_mode(SuspendMode mode, Error **errp)
1926 {
1927 Error *local_err = NULL;
1928 const char *pmutils_args[3] = {"--hibernate", "--suspend",
1929 "--suspend-hybrid"};
1930 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL};
1931 int status;
1932
1933 status = run_process_child(cmd, &local_err);
1934
1935 if (status == SUSPEND_SUPPORTED) {
1936 return true;
1937 }
1938
1939 if ((status == -1) && !local_err) {
1940 return false;
1941 }
1942
1943 if (local_err) {
1944 error_propagate(errp, local_err);
1945 } else {
1946 error_setg(errp,
1947 "the helper program '%s' returned an unexpected exit"
1948 " status code (%d)", "pm-is-supported", status);
1949 }
1950
1951 return false;
1952 }
1953
1954 static void pmutils_suspend(SuspendMode mode, Error **errp)
1955 {
1956 Error *local_err = NULL;
1957 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend",
1958 "pm-suspend-hybrid"};
1959 const char *cmd[2] = {pmutils_binaries[mode], NULL};
1960 int status;
1961
1962 status = run_process_child(cmd, &local_err);
1963
1964 if (status == 0) {
1965 return;
1966 }
1967
1968 if ((status == -1) && !local_err) {
1969 error_setg(errp, "the helper program '%s' was not found",
1970 pmutils_binaries[mode]);
1971 return;
1972 }
1973
1974 if (local_err) {
1975 error_propagate(errp, local_err);
1976 } else {
1977 error_setg(errp,
1978 "the helper program '%s' returned an unexpected exit"
1979 " status code (%d)", pmutils_binaries[mode], status);
1980 }
1981 }
1982
1983 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp)
1984 {
1985 const char *sysfile_strs[3] = {"disk", "mem", NULL};
1986 const char *sysfile_str = sysfile_strs[mode];
1987 char buf[32]; /* hopefully big enough */
1988 int fd;
1989 ssize_t ret;
1990
1991 if (!sysfile_str) {
1992 error_setg(errp, "unknown guest suspend mode");
1993 return false;
1994 }
1995
1996 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
1997 if (fd < 0) {
1998 return false;
1999 }
2000
2001 ret = read(fd, buf, sizeof(buf) - 1);
2002 close(fd);
2003 if (ret <= 0) {
2004 return false;
2005 }
2006 buf[ret] = '\0';
2007
2008 if (strstr(buf, sysfile_str)) {
2009 return true;
2010 }
2011 return false;
2012 }
2013
2014 static void linux_sys_state_suspend(SuspendMode mode, Error **errp)
2015 {
2016 Error *local_err = NULL;
2017 const char *sysfile_strs[3] = {"disk", "mem", NULL};
2018 const char *sysfile_str = sysfile_strs[mode];
2019 pid_t pid;
2020 int status;
2021
2022 if (!sysfile_str) {
2023 error_setg(errp, "unknown guest suspend mode");
2024 return;
2025 }
2026
2027 pid = fork();
2028 if (!pid) {
2029 /* child */
2030 int fd;
2031
2032 setsid();
2033 reopen_fd_to_null(0);
2034 reopen_fd_to_null(1);
2035 reopen_fd_to_null(2);
2036
2037 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
2038 if (fd < 0) {
2039 _exit(EXIT_FAILURE);
2040 }
2041
2042 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
2043 _exit(EXIT_FAILURE);
2044 }
2045
2046 _exit(EXIT_SUCCESS);
2047 } else if (pid < 0) {
2048 error_setg_errno(errp, errno, "failed to create child process");
2049 return;
2050 }
2051
2052 ga_wait_child(pid, &status, &local_err);
2053 if (local_err) {
2054 error_propagate(errp, local_err);
2055 return;
2056 }
2057
2058 if (WEXITSTATUS(status)) {
2059 error_setg(errp, "child process has failed to suspend");
2060 }
2061
2062 }
2063
2064 static void guest_suspend(SuspendMode mode, Error **errp)
2065 {
2066 Error *local_err = NULL;
2067 bool mode_supported = false;
2068
2069 if (systemd_supports_mode(mode, &local_err)) {
2070 mode_supported = true;
2071 systemd_suspend(mode, &local_err);
2072 }
2073
2074 if (!local_err) {
2075 return;
2076 }
2077
2078 error_free(local_err);
2079 local_err = NULL;
2080
2081 if (pmutils_supports_mode(mode, &local_err)) {
2082 mode_supported = true;
2083 pmutils_suspend(mode, &local_err);
2084 }
2085
2086 if (!local_err) {
2087 return;
2088 }
2089
2090 error_free(local_err);
2091 local_err = NULL;
2092
2093 if (linux_sys_state_supports_mode(mode, &local_err)) {
2094 mode_supported = true;
2095 linux_sys_state_suspend(mode, &local_err);
2096 }
2097
2098 if (!mode_supported) {
2099 error_free(local_err);
2100 error_setg(errp,
2101 "the requested suspend mode is not supported by the guest");
2102 } else {
2103 error_propagate(errp, local_err);
2104 }
2105 }
2106
2107 void qmp_guest_suspend_disk(Error **errp)
2108 {
2109 guest_suspend(SUSPEND_MODE_DISK, errp);
2110 }
2111
2112 void qmp_guest_suspend_ram(Error **errp)
2113 {
2114 guest_suspend(SUSPEND_MODE_RAM, errp);
2115 }
2116
2117 void qmp_guest_suspend_hybrid(Error **errp)
2118 {
2119 guest_suspend(SUSPEND_MODE_HYBRID, errp);
2120 }
2121
2122 static GuestNetworkInterfaceList *
2123 guest_find_interface(GuestNetworkInterfaceList *head,
2124 const char *name)
2125 {
2126 for (; head; head = head->next) {
2127 if (strcmp(head->value->name, name) == 0) {
2128 break;
2129 }
2130 }
2131
2132 return head;
2133 }
2134
2135 static int guest_get_network_stats(const char *name,
2136 GuestNetworkInterfaceStat *stats)
2137 {
2138 int name_len;
2139 char const *devinfo = "/proc/net/dev";
2140 FILE *fp;
2141 char *line = NULL, *colon;
2142 size_t n = 0;
2143 fp = fopen(devinfo, "r");
2144 if (!fp) {
2145 return -1;
2146 }
2147 name_len = strlen(name);
2148 while (getline(&line, &n, fp) != -1) {
2149 long long dummy;
2150 long long rx_bytes;
2151 long long rx_packets;
2152 long long rx_errs;
2153 long long rx_dropped;
2154 long long tx_bytes;
2155 long long tx_packets;
2156 long long tx_errs;
2157 long long tx_dropped;
2158 char *trim_line;
2159 trim_line = g_strchug(line);
2160 if (trim_line[0] == '\0') {
2161 continue;
2162 }
2163 colon = strchr(trim_line, ':');
2164 if (!colon) {
2165 continue;
2166 }
2167 if (colon - name_len == trim_line &&
2168 strncmp(trim_line, name, name_len) == 0) {
2169 if (sscanf(colon + 1,
2170 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
2171 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped,
2172 &dummy, &dummy, &dummy, &dummy,
2173 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped,
2174 &dummy, &dummy, &dummy, &dummy) != 16) {
2175 continue;
2176 }
2177 stats->rx_bytes = rx_bytes;
2178 stats->rx_packets = rx_packets;
2179 stats->rx_errs = rx_errs;
2180 stats->rx_dropped = rx_dropped;
2181 stats->tx_bytes = tx_bytes;
2182 stats->tx_packets = tx_packets;
2183 stats->tx_errs = tx_errs;
2184 stats->tx_dropped = tx_dropped;
2185 fclose(fp);
2186 g_free(line);
2187 return 0;
2188 }
2189 }
2190 fclose(fp);
2191 g_free(line);
2192 g_debug("/proc/net/dev: Interface '%s' not found", name);
2193 return -1;
2194 }
2195
2196 /*
2197 * Build information about guest interfaces
2198 */
2199 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2200 {
2201 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
2202 struct ifaddrs *ifap, *ifa;
2203
2204 if (getifaddrs(&ifap) < 0) {
2205 error_setg_errno(errp, errno, "getifaddrs failed");
2206 goto error;
2207 }
2208
2209 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
2210 GuestNetworkInterfaceList *info;
2211 GuestIpAddressList **address_list = NULL, *address_item = NULL;
2212 GuestNetworkInterfaceStat *interface_stat = NULL;
2213 char addr4[INET_ADDRSTRLEN];
2214 char addr6[INET6_ADDRSTRLEN];
2215 int sock;
2216 struct ifreq ifr;
2217 unsigned char *mac_addr;
2218 void *p;
2219
2220 g_debug("Processing %s interface", ifa->ifa_name);
2221
2222 info = guest_find_interface(head, ifa->ifa_name);
2223
2224 if (!info) {
2225 info = g_malloc0(sizeof(*info));
2226 info->value = g_malloc0(sizeof(*info->value));
2227 info->value->name = g_strdup(ifa->ifa_name);
2228
2229 if (!cur_item) {
2230 head = cur_item = info;
2231 } else {
2232 cur_item->next = info;
2233 cur_item = info;
2234 }
2235 }
2236
2237 if (!info->value->has_hardware_address &&
2238 ifa->ifa_flags & SIOCGIFHWADDR) {
2239 /* we haven't obtained HW address yet */
2240 sock = socket(PF_INET, SOCK_STREAM, 0);
2241 if (sock == -1) {
2242 error_setg_errno(errp, errno, "failed to create socket");
2243 goto error;
2244 }
2245
2246 memset(&ifr, 0, sizeof(ifr));
2247 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
2248 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
2249 error_setg_errno(errp, errno,
2250 "failed to get MAC address of %s",
2251 ifa->ifa_name);
2252 close(sock);
2253 goto error;
2254 }
2255
2256 close(sock);
2257 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
2258
2259 info->value->hardware_address =
2260 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
2261 (int) mac_addr[0], (int) mac_addr[1],
2262 (int) mac_addr[2], (int) mac_addr[3],
2263 (int) mac_addr[4], (int) mac_addr[5]);
2264
2265 info->value->has_hardware_address = true;
2266 }
2267
2268 if (ifa->ifa_addr &&
2269 ifa->ifa_addr->sa_family == AF_INET) {
2270 /* interface with IPv4 address */
2271 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
2272 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
2273 error_setg_errno(errp, errno, "inet_ntop failed");
2274 goto error;
2275 }
2276
2277 address_item = g_malloc0(sizeof(*address_item));
2278 address_item->value = g_malloc0(sizeof(*address_item->value));
2279 address_item->value->ip_address = g_strdup(addr4);
2280 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
2281
2282 if (ifa->ifa_netmask) {
2283 /* Count the number of set bits in netmask.
2284 * This is safe as '1' and '0' cannot be shuffled in netmask. */
2285 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
2286 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
2287 }
2288 } else if (ifa->ifa_addr &&
2289 ifa->ifa_addr->sa_family == AF_INET6) {
2290 /* interface with IPv6 address */
2291 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
2292 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
2293 error_setg_errno(errp, errno, "inet_ntop failed");
2294 goto error;
2295 }
2296
2297 address_item = g_malloc0(sizeof(*address_item));
2298 address_item->value = g_malloc0(sizeof(*address_item->value));
2299 address_item->value->ip_address = g_strdup(addr6);
2300 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
2301
2302 if (ifa->ifa_netmask) {
2303 /* Count the number of set bits in netmask.
2304 * This is safe as '1' and '0' cannot be shuffled in netmask. */
2305 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
2306 address_item->value->prefix =
2307 ctpop32(((uint32_t *) p)[0]) +
2308 ctpop32(((uint32_t *) p)[1]) +
2309 ctpop32(((uint32_t *) p)[2]) +
2310 ctpop32(((uint32_t *) p)[3]);
2311 }
2312 }
2313
2314 if (!address_item) {
2315 continue;
2316 }
2317
2318 address_list = &info->value->ip_addresses;
2319
2320 while (*address_list && (*address_list)->next) {
2321 address_list = &(*address_list)->next;
2322 }
2323
2324 if (!*address_list) {
2325 *address_list = address_item;
2326 } else {
2327 (*address_list)->next = address_item;
2328 }
2329
2330 info->value->has_ip_addresses = true;
2331
2332 if (!info->value->has_statistics) {
2333 interface_stat = g_malloc0(sizeof(*interface_stat));
2334 if (guest_get_network_stats(info->value->name,
2335 interface_stat) == -1) {
2336 info->value->has_statistics = false;
2337 g_free(interface_stat);
2338 } else {
2339 info->value->statistics = interface_stat;
2340 info->value->has_statistics = true;
2341 }
2342 }
2343 }
2344
2345 freeifaddrs(ifap);
2346 return head;
2347
2348 error:
2349 freeifaddrs(ifap);
2350 qapi_free_GuestNetworkInterfaceList(head);
2351 return NULL;
2352 }
2353
2354 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
2355
2356 static long sysconf_exact(int name, const char *name_str, Error **errp)
2357 {
2358 long ret;
2359
2360 errno = 0;
2361 ret = sysconf(name);
2362 if (ret == -1) {
2363 if (errno == 0) {
2364 error_setg(errp, "sysconf(%s): value indefinite", name_str);
2365 } else {
2366 error_setg_errno(errp, errno, "sysconf(%s)", name_str);
2367 }
2368 }
2369 return ret;
2370 }
2371
2372 /* Transfer online/offline status between @vcpu and the guest system.
2373 *
2374 * On input either @errp or *@errp must be NULL.
2375 *
2376 * In system-to-@vcpu direction, the following @vcpu fields are accessed:
2377 * - R: vcpu->logical_id
2378 * - W: vcpu->online
2379 * - W: vcpu->can_offline
2380 *
2381 * In @vcpu-to-system direction, the following @vcpu fields are accessed:
2382 * - R: vcpu->logical_id
2383 * - R: vcpu->online
2384 *
2385 * Written members remain unmodified on error.
2386 */
2387 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
2388 char *dirpath, Error **errp)
2389 {
2390 int fd;
2391 int res;
2392 int dirfd;
2393 static const char fn[] = "online";
2394
2395 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2396 if (dirfd == -1) {
2397 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2398 return;
2399 }
2400
2401 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
2402 if (fd == -1) {
2403 if (errno != ENOENT) {
2404 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
2405 } else if (sys2vcpu) {
2406 vcpu->online = true;
2407 vcpu->can_offline = false;
2408 } else if (!vcpu->online) {
2409 error_setg(errp, "logical processor #%" PRId64 " can't be "
2410 "offlined", vcpu->logical_id);
2411 } /* otherwise pretend successful re-onlining */
2412 } else {
2413 unsigned char status;
2414
2415 res = pread(fd, &status, 1, 0);
2416 if (res == -1) {
2417 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
2418 } else if (res == 0) {
2419 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
2420 fn);
2421 } else if (sys2vcpu) {
2422 vcpu->online = (status != '0');
2423 vcpu->can_offline = true;
2424 } else if (vcpu->online != (status != '0')) {
2425 status = '0' + vcpu->online;
2426 if (pwrite(fd, &status, 1, 0) == -1) {
2427 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
2428 fn);
2429 }
2430 } /* otherwise pretend successful re-(on|off)-lining */
2431
2432 res = close(fd);
2433 g_assert(res == 0);
2434 }
2435
2436 res = close(dirfd);
2437 g_assert(res == 0);
2438 }
2439
2440 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2441 {
2442 int64_t current;
2443 GuestLogicalProcessorList *head, **link;
2444 long sc_max;
2445 Error *local_err = NULL;
2446
2447 current = 0;
2448 head = NULL;
2449 link = &head;
2450 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
2451
2452 while (local_err == NULL && current < sc_max) {
2453 GuestLogicalProcessor *vcpu;
2454 GuestLogicalProcessorList *entry;
2455 int64_t id = current++;
2456 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
2457 id);
2458
2459 if (g_file_test(path, G_FILE_TEST_EXISTS)) {
2460 vcpu = g_malloc0(sizeof *vcpu);
2461 vcpu->logical_id = id;
2462 vcpu->has_can_offline = true; /* lolspeak ftw */
2463 transfer_vcpu(vcpu, true, path, &local_err);
2464 entry = g_malloc0(sizeof *entry);
2465 entry->value = vcpu;
2466 *link = entry;
2467 link = &entry->next;
2468 }
2469 g_free(path);
2470 }
2471
2472 if (local_err == NULL) {
2473 /* there's no guest with zero VCPUs */
2474 g_assert(head != NULL);
2475 return head;
2476 }
2477
2478 qapi_free_GuestLogicalProcessorList(head);
2479 error_propagate(errp, local_err);
2480 return NULL;
2481 }
2482
2483 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2484 {
2485 int64_t processed;
2486 Error *local_err = NULL;
2487
2488 processed = 0;
2489 while (vcpus != NULL) {
2490 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
2491 vcpus->value->logical_id);
2492
2493 transfer_vcpu(vcpus->value, false, path, &local_err);
2494 g_free(path);
2495 if (local_err != NULL) {
2496 break;
2497 }
2498 ++processed;
2499 vcpus = vcpus->next;
2500 }
2501
2502 if (local_err != NULL) {
2503 if (processed == 0) {
2504 error_propagate(errp, local_err);
2505 } else {
2506 error_free(local_err);
2507 }
2508 }
2509
2510 return processed;
2511 }
2512
2513 void qmp_guest_set_user_password(const char *username,
2514 const char *password,
2515 bool crypted,
2516 Error **errp)
2517 {
2518 Error *local_err = NULL;
2519 char *passwd_path = NULL;
2520 pid_t pid;
2521 int status;
2522 int datafd[2] = { -1, -1 };
2523 char *rawpasswddata = NULL;
2524 size_t rawpasswdlen;
2525 char *chpasswddata = NULL;
2526 size_t chpasswdlen;
2527
2528 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp);
2529 if (!rawpasswddata) {
2530 return;
2531 }
2532 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
2533 rawpasswddata[rawpasswdlen] = '\0';
2534
2535 if (strchr(rawpasswddata, '\n')) {
2536 error_setg(errp, "forbidden characters in raw password");
2537 goto out;
2538 }
2539
2540 if (strchr(username, '\n') ||
2541 strchr(username, ':')) {
2542 error_setg(errp, "forbidden characters in username");
2543 goto out;
2544 }
2545
2546 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
2547 chpasswdlen = strlen(chpasswddata);
2548
2549 passwd_path = g_find_program_in_path("chpasswd");
2550
2551 if (!passwd_path) {
2552 error_setg(errp, "cannot find 'passwd' program in PATH");
2553 goto out;
2554 }
2555
2556 if (pipe(datafd) < 0) {
2557 error_setg(errp, "cannot create pipe FDs");
2558 goto out;
2559 }
2560
2561 pid = fork();
2562 if (pid == 0) {
2563 close(datafd[1]);
2564 /* child */
2565 setsid();
2566 dup2(datafd[0], 0);
2567 reopen_fd_to_null(1);
2568 reopen_fd_to_null(2);
2569
2570 if (crypted) {
2571 execle(passwd_path, "chpasswd", "-e", NULL, environ);
2572 } else {
2573 execle(passwd_path, "chpasswd", NULL, environ);
2574 }
2575 _exit(EXIT_FAILURE);
2576 } else if (pid < 0) {
2577 error_setg_errno(errp, errno, "failed to create child process");
2578 goto out;
2579 }
2580 close(datafd[0]);
2581 datafd[0] = -1;
2582
2583 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
2584 error_setg_errno(errp, errno, "cannot write new account password");
2585 goto out;
2586 }
2587 close(datafd[1]);
2588 datafd[1] = -1;
2589
2590 ga_wait_child(pid, &status, &local_err);
2591 if (local_err) {
2592 error_propagate(errp, local_err);
2593 goto out;
2594 }
2595
2596 if (!WIFEXITED(status)) {
2597 error_setg(errp, "child process has terminated abnormally");
2598 goto out;
2599 }
2600
2601 if (WEXITSTATUS(status)) {
2602 error_setg(errp, "child process has failed to set user password");
2603 goto out;
2604 }
2605
2606 out:
2607 g_free(chpasswddata);
2608 g_free(rawpasswddata);
2609 g_free(passwd_path);
2610 if (datafd[0] != -1) {
2611 close(datafd[0]);
2612 }
2613 if (datafd[1] != -1) {
2614 close(datafd[1]);
2615 }
2616 }
2617
2618 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
2619 int size, Error **errp)
2620 {
2621 int fd;
2622 int res;
2623
2624 errno = 0;
2625 fd = openat(dirfd, pathname, O_RDONLY);
2626 if (fd == -1) {
2627 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2628 return;
2629 }
2630
2631 res = pread(fd, buf, size, 0);
2632 if (res == -1) {
2633 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
2634 } else if (res == 0) {
2635 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
2636 }
2637 close(fd);
2638 }
2639
2640 static void ga_write_sysfs_file(int dirfd, const char *pathname,
2641 const char *buf, int size, Error **errp)
2642 {
2643 int fd;
2644
2645 errno = 0;
2646 fd = openat(dirfd, pathname, O_WRONLY);
2647 if (fd == -1) {
2648 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2649 return;
2650 }
2651
2652 if (pwrite(fd, buf, size, 0) == -1) {
2653 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
2654 }
2655
2656 close(fd);
2657 }
2658
2659 /* Transfer online/offline status between @mem_blk and the guest system.
2660 *
2661 * On input either @errp or *@errp must be NULL.
2662 *
2663 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
2664 * - R: mem_blk->phys_index
2665 * - W: mem_blk->online
2666 * - W: mem_blk->can_offline
2667 *
2668 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
2669 * - R: mem_blk->phys_index
2670 * - R: mem_blk->online
2671 *- R: mem_blk->can_offline
2672 * Written members remain unmodified on error.
2673 */
2674 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
2675 GuestMemoryBlockResponse *result,
2676 Error **errp)
2677 {
2678 char *dirpath;
2679 int dirfd;
2680 char *status;
2681 Error *local_err = NULL;
2682
2683 if (!sys2memblk) {
2684 DIR *dp;
2685
2686 if (!result) {
2687 error_setg(errp, "Internal error, 'result' should not be NULL");
2688 return;
2689 }
2690 errno = 0;
2691 dp = opendir("/sys/devices/system/memory/");
2692 /* if there is no 'memory' directory in sysfs,
2693 * we think this VM does not support online/offline memory block,
2694 * any other solution?
2695 */
2696 if (!dp) {
2697 if (errno == ENOENT) {
2698 result->response =
2699 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2700 }
2701 goto out1;
2702 }
2703 closedir(dp);
2704 }
2705
2706 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
2707 mem_blk->phys_index);
2708 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2709 if (dirfd == -1) {
2710 if (sys2memblk) {
2711 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2712 } else {
2713 if (errno == ENOENT) {
2714 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
2715 } else {
2716 result->response =
2717 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2718 }
2719 }
2720 g_free(dirpath);
2721 goto out1;
2722 }
2723 g_free(dirpath);
2724
2725 status = g_malloc0(10);
2726 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
2727 if (local_err) {
2728 /* treat with sysfs file that not exist in old kernel */
2729 if (errno == ENOENT) {
2730 error_free(local_err);
2731 if (sys2memblk) {
2732 mem_blk->online = true;
2733 mem_blk->can_offline = false;
2734 } else if (!mem_blk->online) {
2735 result->response =
2736 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2737 }
2738 } else {
2739 if (sys2memblk) {
2740 error_propagate(errp, local_err);
2741 } else {
2742 error_free(local_err);
2743 result->response =
2744 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2745 }
2746 }
2747 goto out2;
2748 }
2749
2750 if (sys2memblk) {
2751 char removable = '0';
2752
2753 mem_blk->online = (strncmp(status, "online", 6) == 0);
2754
2755 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
2756 if (local_err) {
2757 /* if no 'removable' file, it doesn't support offline mem blk */
2758 if (errno == ENOENT) {
2759 error_free(local_err);
2760 mem_blk->can_offline = false;
2761 } else {
2762 error_propagate(errp, local_err);
2763 }
2764 } else {
2765 mem_blk->can_offline = (removable != '0');
2766 }
2767 } else {
2768 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
2769 const char *new_state = mem_blk->online ? "online" : "offline";
2770
2771 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
2772 &local_err);
2773 if (local_err) {
2774 error_free(local_err);
2775 result->response =
2776 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2777 goto out2;
2778 }
2779
2780 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
2781 result->has_error_code = false;
2782 } /* otherwise pretend successful re-(on|off)-lining */
2783 }
2784 g_free(status);
2785 close(dirfd);
2786 return;
2787
2788 out2:
2789 g_free(status);
2790 close(dirfd);
2791 out1:
2792 if (!sys2memblk) {
2793 result->has_error_code = true;
2794 result->error_code = errno;
2795 }
2796 }
2797
2798 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2799 {
2800 GuestMemoryBlockList *head, **link;
2801 Error *local_err = NULL;
2802 struct dirent *de;
2803 DIR *dp;
2804
2805 head = NULL;
2806 link = &head;
2807
2808 dp = opendir("/sys/devices/system/memory/");
2809 if (!dp) {
2810 /* it's ok if this happens to be a system that doesn't expose
2811 * memory blocks via sysfs, but otherwise we should report
2812 * an error
2813 */
2814 if (errno != ENOENT) {
2815 error_setg_errno(errp, errno, "Can't open directory"
2816 "\"/sys/devices/system/memory/\"");
2817 }
2818 return NULL;
2819 }
2820
2821 /* Note: the phys_index of memory block may be discontinuous,
2822 * this is because a memblk is the unit of the Sparse Memory design, which
2823 * allows discontinuous memory ranges (ex. NUMA), so here we should
2824 * traverse the memory block directory.
2825 */
2826 while ((de = readdir(dp)) != NULL) {
2827 GuestMemoryBlock *mem_blk;
2828 GuestMemoryBlockList *entry;
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 entry = g_malloc0(sizeof *entry);
2845 entry->value = mem_blk;
2846
2847 *link = entry;
2848 link = &entry->next;
2849 }
2850
2851 closedir(dp);
2852 if (local_err == NULL) {
2853 /* there's no guest with zero memory blocks */
2854 if (head == NULL) {
2855 error_setg(errp, "guest reported zero memory blocks!");
2856 }
2857 return head;
2858 }
2859
2860 qapi_free_GuestMemoryBlockList(head);
2861 error_propagate(errp, local_err);
2862 return NULL;
2863 }
2864
2865 GuestMemoryBlockResponseList *
2866 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2867 {
2868 GuestMemoryBlockResponseList *head, **link;
2869 Error *local_err = NULL;
2870
2871 head = NULL;
2872 link = &head;
2873
2874 while (mem_blks != NULL) {
2875 GuestMemoryBlockResponse *result;
2876 GuestMemoryBlockResponseList *entry;
2877 GuestMemoryBlock *current_mem_blk = mem_blks->value;
2878
2879 result = g_malloc0(sizeof(*result));
2880 result->phys_index = current_mem_blk->phys_index;
2881 transfer_memory_block(current_mem_blk, false, result, &local_err);
2882 if (local_err) { /* should never happen */
2883 goto err;
2884 }
2885 entry = g_malloc0(sizeof *entry);
2886 entry->value = result;
2887
2888 *link = entry;
2889 link = &entry->next;
2890 mem_blks = mem_blks->next;
2891 }
2892
2893 return head;
2894 err:
2895 qapi_free_GuestMemoryBlockResponseList(head);
2896 error_propagate(errp, local_err);
2897 return NULL;
2898 }
2899
2900 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2901 {
2902 Error *local_err = NULL;
2903 char *dirpath;
2904 int dirfd;
2905 char *buf;
2906 GuestMemoryBlockInfo *info;
2907
2908 dirpath = g_strdup_printf("/sys/devices/system/memory/");
2909 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2910 if (dirfd == -1) {
2911 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2912 g_free(dirpath);
2913 return NULL;
2914 }
2915 g_free(dirpath);
2916
2917 buf = g_malloc0(20);
2918 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
2919 close(dirfd);
2920 if (local_err) {
2921 g_free(buf);
2922 error_propagate(errp, local_err);
2923 return NULL;
2924 }
2925
2926 info = g_new0(GuestMemoryBlockInfo, 1);
2927 info->size = strtol(buf, NULL, 16); /* the unit is bytes */
2928
2929 g_free(buf);
2930
2931 return info;
2932 }
2933
2934 #else /* defined(__linux__) */
2935
2936 void qmp_guest_suspend_disk(Error **errp)
2937 {
2938 error_setg(errp, QERR_UNSUPPORTED);
2939 }
2940
2941 void qmp_guest_suspend_ram(Error **errp)
2942 {
2943 error_setg(errp, QERR_UNSUPPORTED);
2944 }
2945
2946 void qmp_guest_suspend_hybrid(Error **errp)
2947 {
2948 error_setg(errp, QERR_UNSUPPORTED);
2949 }
2950
2951 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2952 {
2953 error_setg(errp, QERR_UNSUPPORTED);
2954 return NULL;
2955 }
2956
2957 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2958 {
2959 error_setg(errp, QERR_UNSUPPORTED);
2960 return NULL;
2961 }
2962
2963 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2964 {
2965 error_setg(errp, QERR_UNSUPPORTED);
2966 return -1;
2967 }
2968
2969 void qmp_guest_set_user_password(const char *username,
2970 const char *password,
2971 bool crypted,
2972 Error **errp)
2973 {
2974 error_setg(errp, QERR_UNSUPPORTED);
2975 }
2976
2977 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2978 {
2979 error_setg(errp, QERR_UNSUPPORTED);
2980 return NULL;
2981 }
2982
2983 GuestMemoryBlockResponseList *
2984 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2985 {
2986 error_setg(errp, QERR_UNSUPPORTED);
2987 return NULL;
2988 }
2989
2990 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2991 {
2992 error_setg(errp, QERR_UNSUPPORTED);
2993 return NULL;
2994 }
2995
2996 #endif
2997
2998 #if !defined(CONFIG_FSFREEZE)
2999
3000 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
3001 {
3002 error_setg(errp, QERR_UNSUPPORTED);
3003 return NULL;
3004 }
3005
3006 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
3007 {
3008 error_setg(errp, QERR_UNSUPPORTED);
3009
3010 return 0;
3011 }
3012
3013 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
3014 {
3015 error_setg(errp, QERR_UNSUPPORTED);
3016
3017 return 0;
3018 }
3019
3020 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
3021 strList *mountpoints,
3022 Error **errp)
3023 {
3024 error_setg(errp, QERR_UNSUPPORTED);
3025
3026 return 0;
3027 }
3028
3029 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
3030 {
3031 error_setg(errp, QERR_UNSUPPORTED);
3032
3033 return 0;
3034 }
3035
3036 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
3037 {
3038 error_setg(errp, QERR_UNSUPPORTED);
3039 return NULL;
3040 }
3041
3042 #endif /* CONFIG_FSFREEZE */
3043
3044 #if !defined(CONFIG_FSTRIM)
3045 GuestFilesystemTrimResponse *
3046 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
3047 {
3048 error_setg(errp, QERR_UNSUPPORTED);
3049 return NULL;
3050 }
3051 #endif
3052
3053 /* add unsupported commands to the blacklist */
3054 GList *ga_command_blacklist_init(GList *blacklist)
3055 {
3056 #if !defined(__linux__)
3057 {
3058 const char *list[] = {
3059 "guest-suspend-disk", "guest-suspend-ram",
3060 "guest-suspend-hybrid", "guest-network-get-interfaces",
3061 "guest-get-vcpus", "guest-set-vcpus",
3062 "guest-get-memory-blocks", "guest-set-memory-blocks",
3063 "guest-get-memory-block-size", "guest-get-memory-block-info",
3064 NULL};
3065 char **p = (char **)list;
3066
3067 while (*p) {
3068 blacklist = g_list_append(blacklist, g_strdup(*p++));
3069 }
3070 }
3071 #endif
3072
3073 #if !defined(CONFIG_FSFREEZE)
3074 {
3075 const char *list[] = {
3076 "guest-get-fsinfo", "guest-fsfreeze-status",
3077 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
3078 "guest-fsfreeze-thaw", "guest-get-fsinfo",
3079 "guest-get-disks", NULL};
3080 char **p = (char **)list;
3081
3082 while (*p) {
3083 blacklist = g_list_append(blacklist, g_strdup(*p++));
3084 }
3085 }
3086 #endif
3087
3088 #if !defined(CONFIG_FSTRIM)
3089 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim"));
3090 #endif
3091
3092 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices"));
3093
3094 return blacklist;
3095 }
3096
3097 /* register init/cleanup routines for stateful command groups */
3098 void ga_command_state_init(GAState *s, GACommandState *cs)
3099 {
3100 #if defined(CONFIG_FSFREEZE)
3101 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
3102 #endif
3103 }
3104
3105 #ifdef HAVE_UTMPX
3106
3107 #define QGA_MICRO_SECOND_TO_SECOND 1000000
3108
3109 static double ga_get_login_time(struct utmpx *user_info)
3110 {
3111 double seconds = (double)user_info->ut_tv.tv_sec;
3112 double useconds = (double)user_info->ut_tv.tv_usec;
3113 useconds /= QGA_MICRO_SECOND_TO_SECOND;
3114 return seconds + useconds;
3115 }
3116
3117 GuestUserList *qmp_guest_get_users(Error **errp)
3118 {
3119 GHashTable *cache = NULL;
3120 GuestUserList *head = NULL, *cur_item = NULL;
3121 struct utmpx *user_info = NULL;
3122 gpointer value = NULL;
3123 GuestUser *user = NULL;
3124 GuestUserList *item = NULL;
3125 double login_time = 0;
3126
3127 cache = g_hash_table_new(g_str_hash, g_str_equal);
3128 setutxent();
3129
3130 for (;;) {
3131 user_info = getutxent();
3132 if (user_info == NULL) {
3133 break;
3134 } else if (user_info->ut_type != USER_PROCESS) {
3135 continue;
3136 } else if (g_hash_table_contains(cache, user_info->ut_user)) {
3137 value = g_hash_table_lookup(cache, user_info->ut_user);
3138 user = (GuestUser *)value;
3139 login_time = ga_get_login_time(user_info);
3140 /* We're ensuring the earliest login time to be sent */
3141 if (login_time < user->login_time) {
3142 user->login_time = login_time;
3143 }
3144 continue;
3145 }
3146
3147 item = g_new0(GuestUserList, 1);
3148 item->value = g_new0(GuestUser, 1);
3149 item->value->user = g_strdup(user_info->ut_user);
3150 item->value->login_time = ga_get_login_time(user_info);
3151
3152 g_hash_table_insert(cache, item->value->user, item->value);
3153
3154 if (!cur_item) {
3155 head = cur_item = item;
3156 } else {
3157 cur_item->next = item;
3158 cur_item = item;
3159 }
3160 }
3161 endutxent();
3162 g_hash_table_destroy(cache);
3163 return head;
3164 }
3165
3166 #else
3167
3168 GuestUserList *qmp_guest_get_users(Error **errp)
3169 {
3170 error_setg(errp, QERR_UNSUPPORTED);
3171 return NULL;
3172 }
3173
3174 #endif
3175
3176 /* Replace escaped special characters with theire real values. The replacement
3177 * is done in place -- returned value is in the original string.
3178 */
3179 static void ga_osrelease_replace_special(gchar *value)
3180 {
3181 gchar *p, *p2, quote;
3182
3183 /* Trim the string at first space or semicolon if it is not enclosed in
3184 * single or double quotes. */
3185 if ((value[0] != '"') || (value[0] == '\'')) {
3186 p = strchr(value, ' ');
3187 if (p != NULL) {
3188 *p = 0;
3189 }
3190 p = strchr(value, ';');
3191 if (p != NULL) {
3192 *p = 0;
3193 }
3194 return;
3195 }
3196
3197 quote = value[0];
3198 p2 = value;
3199 p = value + 1;
3200 while (*p != 0) {
3201 if (*p == '\\') {
3202 p++;
3203 switch (*p) {
3204 case '$':
3205 case '\'':
3206 case '"':
3207 case '\\':
3208 case '`':
3209 break;
3210 default:
3211 /* Keep literal backslash followed by whatever is there */
3212 p--;
3213 break;
3214 }
3215 } else if (*p == quote) {
3216 *p2 = 0;
3217 break;
3218 }
3219 *(p2++) = *(p++);
3220 }
3221 }
3222
3223 static GKeyFile *ga_parse_osrelease(const char *fname)
3224 {
3225 gchar *content = NULL;
3226 gchar *content2 = NULL;
3227 GError *err = NULL;
3228 GKeyFile *keys = g_key_file_new();
3229 const char *group = "[os-release]\n";
3230
3231 if (!g_file_get_contents(fname, &content, NULL, &err)) {
3232 slog("failed to read '%s', error: %s", fname, err->message);
3233 goto fail;
3234 }
3235
3236 if (!g_utf8_validate(content, -1, NULL)) {
3237 slog("file is not utf-8 encoded: %s", fname);
3238 goto fail;
3239 }
3240 content2 = g_strdup_printf("%s%s", group, content);
3241
3242 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE,
3243 &err)) {
3244 slog("failed to parse file '%s', error: %s", fname, err->message);
3245 goto fail;
3246 }
3247
3248 g_free(content);
3249 g_free(content2);
3250 return keys;
3251
3252 fail:
3253 g_error_free(err);
3254 g_free(content);
3255 g_free(content2);
3256 g_key_file_free(keys);
3257 return NULL;
3258 }
3259
3260 GuestOSInfo *qmp_guest_get_osinfo(Error **errp)
3261 {
3262 GuestOSInfo *info = NULL;
3263 struct utsname kinfo;
3264 GKeyFile *osrelease = NULL;
3265 const char *qga_os_release = g_getenv("QGA_OS_RELEASE");
3266
3267 info = g_new0(GuestOSInfo, 1);
3268
3269 if (uname(&kinfo) != 0) {
3270 error_setg_errno(errp, errno, "uname failed");
3271 } else {
3272 info->has_kernel_version = true;
3273 info->kernel_version = g_strdup(kinfo.version);
3274 info->has_kernel_release = true;
3275 info->kernel_release = g_strdup(kinfo.release);
3276 info->has_machine = true;
3277 info->machine = g_strdup(kinfo.machine);
3278 }
3279
3280 if (qga_os_release != NULL) {
3281 osrelease = ga_parse_osrelease(qga_os_release);
3282 } else {
3283 osrelease = ga_parse_osrelease("/etc/os-release");
3284 if (osrelease == NULL) {
3285 osrelease = ga_parse_osrelease("/usr/lib/os-release");
3286 }
3287 }
3288
3289 if (osrelease != NULL) {
3290 char *value;
3291
3292 #define GET_FIELD(field, osfield) do { \
3293 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \
3294 if (value != NULL) { \
3295 ga_osrelease_replace_special(value); \
3296 info->has_ ## field = true; \
3297 info->field = value; \
3298 } \
3299 } while (0)
3300 GET_FIELD(id, "ID");
3301 GET_FIELD(name, "NAME");
3302 GET_FIELD(pretty_name, "PRETTY_NAME");
3303 GET_FIELD(version, "VERSION");
3304 GET_FIELD(version_id, "VERSION_ID");
3305 GET_FIELD(variant, "VARIANT");
3306 GET_FIELD(variant_id, "VARIANT_ID");
3307 #undef GET_FIELD
3308
3309 g_key_file_free(osrelease);
3310 }
3311
3312 return info;
3313 }
3314
3315 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
3316 {
3317 error_setg(errp, QERR_UNSUPPORTED);
3318
3319 return NULL;
3320 }
AR7 emulation for QEMU