xref: /openbmc/qemu/qga/commands-posix.c (revision 1da79ecc)
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         /* Add parent disk as dependent for easier tracking of hierarchy */
1380         QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev));
1381 
1382         QAPI_LIST_PREPEND(ret, partition);
1383     }
1384     closedir(dp_disk);
1385 
1386     return ret;
1387 }
1388 
1389 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1390 {
1391     GuestDiskInfoList *ret = NULL;
1392     GuestDiskInfo *disk;
1393     DIR *dp = NULL;
1394     struct dirent *de = NULL;
1395 
1396     g_debug("listing /sys/block directory");
1397     dp = opendir("/sys/block");
1398     if (dp == NULL) {
1399         error_setg_errno(errp, errno, "Can't open directory \"/sys/block\"");
1400         return NULL;
1401     }
1402     while ((de = readdir(dp)) != NULL) {
1403         g_autofree char *disk_dir = NULL, *line = NULL,
1404             *size_path = NULL;
1405         char *dev_name;
1406         Error *local_err = NULL;
1407         if (de->d_type != DT_LNK) {
1408             g_debug("  skipping entry: %s", de->d_name);
1409             continue;
1410         }
1411 
1412         /* Check size and skip zero-sized disks */
1413         g_debug("  checking disk size");
1414         size_path = g_strdup_printf("/sys/block/%s/size", de->d_name);
1415         if (!g_file_get_contents(size_path, &line, NULL, NULL)) {
1416             g_debug("  failed to read disk size");
1417             continue;
1418         }
1419         if (g_strcmp0(line, "0\n") == 0) {
1420             g_debug("  skipping zero-sized disk");
1421             continue;
1422         }
1423 
1424         g_debug("  adding %s", de->d_name);
1425         disk_dir = g_strdup_printf("/sys/block/%s", de->d_name);
1426         dev_name = get_device_for_syspath(disk_dir);
1427         if (dev_name == NULL) {
1428             g_debug("Failed to get device name for syspath: %s",
1429                 disk_dir);
1430             continue;
1431         }
1432         disk = g_new0(GuestDiskInfo, 1);
1433         disk->name = dev_name;
1434         disk->partition = false;
1435         disk->alias = get_alias_for_syspath(disk_dir);
1436         disk->has_alias = (disk->alias != NULL);
1437         QAPI_LIST_PREPEND(ret, disk);
1438 
1439         /* Get address for non-virtual devices */
1440         bool is_virtual = is_disk_virtual(disk_dir, &local_err);
1441         if (local_err != NULL) {
1442             g_debug("  failed to check disk path, ignoring error: %s",
1443                 error_get_pretty(local_err));
1444             error_free(local_err);
1445             local_err = NULL;
1446             /* Don't try to get the address */
1447             is_virtual = true;
1448         }
1449         if (!is_virtual) {
1450             disk->address = get_disk_address(disk_dir, &local_err);
1451             if (local_err != NULL) {
1452                 g_debug("  failed to get device info, ignoring error: %s",
1453                     error_get_pretty(local_err));
1454                 error_free(local_err);
1455                 local_err = NULL;
1456             } else if (disk->address != NULL) {
1457                 disk->has_address = true;
1458             }
1459         }
1460 
1461         get_disk_deps(disk_dir, disk);
1462         ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name);
1463     }
1464 
1465     closedir(dp);
1466 
1467     return ret;
1468 }
1469 
1470 #else
1471 
1472 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
1473 {
1474     error_setg(errp, QERR_UNSUPPORTED);
1475     return NULL;
1476 }
1477 
1478 #endif
1479 
1480 /* Return a list of the disk device(s)' info which @mount lies on */
1481 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
1482                                                Error **errp)
1483 {
1484     GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
1485     struct statvfs buf;
1486     unsigned long used, nonroot_total, fr_size;
1487     char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
1488                                     mount->devmajor, mount->devminor);
1489 
1490     fs->mountpoint = g_strdup(mount->dirname);
1491     fs->type = g_strdup(mount->devtype);
1492     build_guest_fsinfo_for_device(devpath, fs, errp);
1493 
1494     if (statvfs(fs->mountpoint, &buf) == 0) {
1495         fr_size = buf.f_frsize;
1496         used = buf.f_blocks - buf.f_bfree;
1497         nonroot_total = used + buf.f_bavail;
1498         fs->used_bytes = used * fr_size;
1499         fs->total_bytes = nonroot_total * fr_size;
1500 
1501         fs->has_total_bytes = true;
1502         fs->has_used_bytes = true;
1503     }
1504 
1505     g_free(devpath);
1506 
1507     return fs;
1508 }
1509 
1510 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
1511 {
1512     FsMountList mounts;
1513     struct FsMount *mount;
1514     GuestFilesystemInfoList *ret = NULL;
1515     Error *local_err = NULL;
1516 
1517     QTAILQ_INIT(&mounts);
1518     build_fs_mount_list(&mounts, &local_err);
1519     if (local_err) {
1520         error_propagate(errp, local_err);
1521         return NULL;
1522     }
1523 
1524     QTAILQ_FOREACH(mount, &mounts, next) {
1525         g_debug("Building guest fsinfo for '%s'", mount->dirname);
1526 
1527         QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err));
1528         if (local_err) {
1529             error_propagate(errp, local_err);
1530             qapi_free_GuestFilesystemInfoList(ret);
1531             ret = NULL;
1532             break;
1533         }
1534     }
1535 
1536     free_fs_mount_list(&mounts);
1537     return ret;
1538 }
1539 
1540 
1541 typedef enum {
1542     FSFREEZE_HOOK_THAW = 0,
1543     FSFREEZE_HOOK_FREEZE,
1544 } FsfreezeHookArg;
1545 
1546 static const char *fsfreeze_hook_arg_string[] = {
1547     "thaw",
1548     "freeze",
1549 };
1550 
1551 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
1552 {
1553     int status;
1554     pid_t pid;
1555     const char *hook;
1556     const char *arg_str = fsfreeze_hook_arg_string[arg];
1557     Error *local_err = NULL;
1558 
1559     hook = ga_fsfreeze_hook(ga_state);
1560     if (!hook) {
1561         return;
1562     }
1563     if (access(hook, X_OK) != 0) {
1564         error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
1565         return;
1566     }
1567 
1568     slog("executing fsfreeze hook with arg '%s'", arg_str);
1569     pid = fork();
1570     if (pid == 0) {
1571         setsid();
1572         reopen_fd_to_null(0);
1573         reopen_fd_to_null(1);
1574         reopen_fd_to_null(2);
1575 
1576         execle(hook, hook, arg_str, NULL, environ);
1577         _exit(EXIT_FAILURE);
1578     } else if (pid < 0) {
1579         error_setg_errno(errp, errno, "failed to create child process");
1580         return;
1581     }
1582 
1583     ga_wait_child(pid, &status, &local_err);
1584     if (local_err) {
1585         error_propagate(errp, local_err);
1586         return;
1587     }
1588 
1589     if (!WIFEXITED(status)) {
1590         error_setg(errp, "fsfreeze hook has terminated abnormally");
1591         return;
1592     }
1593 
1594     status = WEXITSTATUS(status);
1595     if (status) {
1596         error_setg(errp, "fsfreeze hook has failed with status %d", status);
1597         return;
1598     }
1599 }
1600 
1601 /*
1602  * Return status of freeze/thaw
1603  */
1604 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1605 {
1606     if (ga_is_frozen(ga_state)) {
1607         return GUEST_FSFREEZE_STATUS_FROZEN;
1608     }
1609 
1610     return GUEST_FSFREEZE_STATUS_THAWED;
1611 }
1612 
1613 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1614 {
1615     return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
1616 }
1617 
1618 /*
1619  * Walk list of mounted file systems in the guest, and freeze the ones which
1620  * are real local file systems.
1621  */
1622 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1623                                        strList *mountpoints,
1624                                        Error **errp)
1625 {
1626     int ret = 0, i = 0;
1627     strList *list;
1628     FsMountList mounts;
1629     struct FsMount *mount;
1630     Error *local_err = NULL;
1631     int fd;
1632 
1633     slog("guest-fsfreeze called");
1634 
1635     execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
1636     if (local_err) {
1637         error_propagate(errp, local_err);
1638         return -1;
1639     }
1640 
1641     QTAILQ_INIT(&mounts);
1642     build_fs_mount_list(&mounts, &local_err);
1643     if (local_err) {
1644         error_propagate(errp, local_err);
1645         return -1;
1646     }
1647 
1648     /* cannot risk guest agent blocking itself on a write in this state */
1649     ga_set_frozen(ga_state);
1650 
1651     QTAILQ_FOREACH_REVERSE(mount, &mounts, next) {
1652         /* To issue fsfreeze in the reverse order of mounts, check if the
1653          * mount is listed in the list here */
1654         if (has_mountpoints) {
1655             for (list = mountpoints; list; list = list->next) {
1656                 if (strcmp(list->value, mount->dirname) == 0) {
1657                     break;
1658                 }
1659             }
1660             if (!list) {
1661                 continue;
1662             }
1663         }
1664 
1665         fd = qemu_open_old(mount->dirname, O_RDONLY);
1666         if (fd == -1) {
1667             error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
1668             goto error;
1669         }
1670 
1671         /* we try to cull filesystems we know won't work in advance, but other
1672          * filesystems may not implement fsfreeze for less obvious reasons.
1673          * these will report EOPNOTSUPP. we simply ignore these when tallying
1674          * the number of frozen filesystems.
1675          * if a filesystem is mounted more than once (aka bind mount) a
1676          * consecutive attempt to freeze an already frozen filesystem will
1677          * return EBUSY.
1678          *
1679          * any other error means a failure to freeze a filesystem we
1680          * expect to be freezable, so return an error in those cases
1681          * and return system to thawed state.
1682          */
1683         ret = ioctl(fd, FIFREEZE);
1684         if (ret == -1) {
1685             if (errno != EOPNOTSUPP && errno != EBUSY) {
1686                 error_setg_errno(errp, errno, "failed to freeze %s",
1687                                  mount->dirname);
1688                 close(fd);
1689                 goto error;
1690             }
1691         } else {
1692             i++;
1693         }
1694         close(fd);
1695     }
1696 
1697     free_fs_mount_list(&mounts);
1698     /* We may not issue any FIFREEZE here.
1699      * Just unset ga_state here and ready for the next call.
1700      */
1701     if (i == 0) {
1702         ga_unset_frozen(ga_state);
1703     }
1704     return i;
1705 
1706 error:
1707     free_fs_mount_list(&mounts);
1708     qmp_guest_fsfreeze_thaw(NULL);
1709     return 0;
1710 }
1711 
1712 /*
1713  * Walk list of frozen file systems in the guest, and thaw them.
1714  */
1715 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1716 {
1717     int ret;
1718     FsMountList mounts;
1719     FsMount *mount;
1720     int fd, i = 0, logged;
1721     Error *local_err = NULL;
1722 
1723     QTAILQ_INIT(&mounts);
1724     build_fs_mount_list(&mounts, &local_err);
1725     if (local_err) {
1726         error_propagate(errp, local_err);
1727         return 0;
1728     }
1729 
1730     QTAILQ_FOREACH(mount, &mounts, next) {
1731         logged = false;
1732         fd = qemu_open_old(mount->dirname, O_RDONLY);
1733         if (fd == -1) {
1734             continue;
1735         }
1736         /* we have no way of knowing whether a filesystem was actually unfrozen
1737          * as a result of a successful call to FITHAW, only that if an error
1738          * was returned the filesystem was *not* unfrozen by that particular
1739          * call.
1740          *
1741          * since multiple preceding FIFREEZEs require multiple calls to FITHAW
1742          * to unfreeze, continuing issuing FITHAW until an error is returned,
1743          * in which case either the filesystem is in an unfreezable state, or,
1744          * more likely, it was thawed previously (and remains so afterward).
1745          *
1746          * also, since the most recent successful call is the one that did
1747          * the actual unfreeze, we can use this to provide an accurate count
1748          * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
1749          * may * be useful for determining whether a filesystem was unfrozen
1750          * during the freeze/thaw phase by a process other than qemu-ga.
1751          */
1752         do {
1753             ret = ioctl(fd, FITHAW);
1754             if (ret == 0 && !logged) {
1755                 i++;
1756                 logged = true;
1757             }
1758         } while (ret == 0);
1759         close(fd);
1760     }
1761 
1762     ga_unset_frozen(ga_state);
1763     free_fs_mount_list(&mounts);
1764 
1765     execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
1766 
1767     return i;
1768 }
1769 
1770 static void guest_fsfreeze_cleanup(void)
1771 {
1772     Error *err = NULL;
1773 
1774     if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
1775         qmp_guest_fsfreeze_thaw(&err);
1776         if (err) {
1777             slog("failed to clean up frozen filesystems: %s",
1778                  error_get_pretty(err));
1779             error_free(err);
1780         }
1781     }
1782 }
1783 #endif /* CONFIG_FSFREEZE */
1784 
1785 #if defined(CONFIG_FSTRIM)
1786 /*
1787  * Walk list of mounted file systems in the guest, and trim them.
1788  */
1789 GuestFilesystemTrimResponse *
1790 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1791 {
1792     GuestFilesystemTrimResponse *response;
1793     GuestFilesystemTrimResult *result;
1794     int ret = 0;
1795     FsMountList mounts;
1796     struct FsMount *mount;
1797     int fd;
1798     Error *local_err = NULL;
1799     struct fstrim_range r;
1800 
1801     slog("guest-fstrim called");
1802 
1803     QTAILQ_INIT(&mounts);
1804     build_fs_mount_list(&mounts, &local_err);
1805     if (local_err) {
1806         error_propagate(errp, local_err);
1807         return NULL;
1808     }
1809 
1810     response = g_malloc0(sizeof(*response));
1811 
1812     QTAILQ_FOREACH(mount, &mounts, next) {
1813         result = g_malloc0(sizeof(*result));
1814         result->path = g_strdup(mount->dirname);
1815 
1816         QAPI_LIST_PREPEND(response->paths, result);
1817 
1818         fd = qemu_open_old(mount->dirname, O_RDONLY);
1819         if (fd == -1) {
1820             result->error = g_strdup_printf("failed to open: %s",
1821                                             strerror(errno));
1822             result->has_error = true;
1823             continue;
1824         }
1825 
1826         /* We try to cull filesystems we know won't work in advance, but other
1827          * filesystems may not implement fstrim for less obvious reasons.
1828          * These will report EOPNOTSUPP; while in some other cases ENOTTY
1829          * will be reported (e.g. CD-ROMs).
1830          * Any other error means an unexpected error.
1831          */
1832         r.start = 0;
1833         r.len = -1;
1834         r.minlen = has_minimum ? minimum : 0;
1835         ret = ioctl(fd, FITRIM, &r);
1836         if (ret == -1) {
1837             result->has_error = true;
1838             if (errno == ENOTTY || errno == EOPNOTSUPP) {
1839                 result->error = g_strdup("trim not supported");
1840             } else {
1841                 result->error = g_strdup_printf("failed to trim: %s",
1842                                                 strerror(errno));
1843             }
1844             close(fd);
1845             continue;
1846         }
1847 
1848         result->has_minimum = true;
1849         result->minimum = r.minlen;
1850         result->has_trimmed = true;
1851         result->trimmed = r.len;
1852         close(fd);
1853     }
1854 
1855     free_fs_mount_list(&mounts);
1856     return response;
1857 }
1858 #endif /* CONFIG_FSTRIM */
1859 
1860 
1861 #define LINUX_SYS_STATE_FILE "/sys/power/state"
1862 #define SUSPEND_SUPPORTED 0
1863 #define SUSPEND_NOT_SUPPORTED 1
1864 
1865 typedef enum {
1866     SUSPEND_MODE_DISK = 0,
1867     SUSPEND_MODE_RAM = 1,
1868     SUSPEND_MODE_HYBRID = 2,
1869 } SuspendMode;
1870 
1871 /*
1872  * Executes a command in a child process using g_spawn_sync,
1873  * returning an int >= 0 representing the exit status of the
1874  * process.
1875  *
1876  * If the program wasn't found in path, returns -1.
1877  *
1878  * If a problem happened when creating the child process,
1879  * returns -1 and errp is set.
1880  */
1881 static int run_process_child(const char *command[], Error **errp)
1882 {
1883     int exit_status, spawn_flag;
1884     GError *g_err = NULL;
1885     bool success;
1886 
1887     spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL |
1888                  G_SPAWN_STDERR_TO_DEV_NULL;
1889 
1890     success =  g_spawn_sync(NULL, (char **)command, environ, spawn_flag,
1891                             NULL, NULL, NULL, NULL,
1892                             &exit_status, &g_err);
1893 
1894     if (success) {
1895         return WEXITSTATUS(exit_status);
1896     }
1897 
1898     if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) {
1899         error_setg(errp, "failed to create child process, error '%s'",
1900                    g_err->message);
1901     }
1902 
1903     g_error_free(g_err);
1904     return -1;
1905 }
1906 
1907 static bool systemd_supports_mode(SuspendMode mode, Error **errp)
1908 {
1909     const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend",
1910                                      "systemd-hybrid-sleep"};
1911     const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL};
1912     int status;
1913 
1914     status = run_process_child(cmd, errp);
1915 
1916     /*
1917      * systemctl status uses LSB return codes so we can expect
1918      * status > 0 and be ok. To assert if the guest has support
1919      * for the selected suspend mode, status should be < 4. 4 is
1920      * the code for unknown service status, the return value when
1921      * the service does not exist. A common value is status = 3
1922      * (program is not running).
1923      */
1924     if (status > 0 && status < 4) {
1925         return true;
1926     }
1927 
1928     return false;
1929 }
1930 
1931 static void systemd_suspend(SuspendMode mode, Error **errp)
1932 {
1933     Error *local_err = NULL;
1934     const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"};
1935     const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL};
1936     int status;
1937 
1938     status = run_process_child(cmd, &local_err);
1939 
1940     if (status == 0) {
1941         return;
1942     }
1943 
1944     if ((status == -1) && !local_err) {
1945         error_setg(errp, "the helper program 'systemctl %s' was not found",
1946                    systemctl_args[mode]);
1947         return;
1948     }
1949 
1950     if (local_err) {
1951         error_propagate(errp, local_err);
1952     } else {
1953         error_setg(errp, "the helper program 'systemctl %s' returned an "
1954                    "unexpected exit status code (%d)",
1955                    systemctl_args[mode], status);
1956     }
1957 }
1958 
1959 static bool pmutils_supports_mode(SuspendMode mode, Error **errp)
1960 {
1961     Error *local_err = NULL;
1962     const char *pmutils_args[3] = {"--hibernate", "--suspend",
1963                                    "--suspend-hybrid"};
1964     const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL};
1965     int status;
1966 
1967     status = run_process_child(cmd, &local_err);
1968 
1969     if (status == SUSPEND_SUPPORTED) {
1970         return true;
1971     }
1972 
1973     if ((status == -1) && !local_err) {
1974         return false;
1975     }
1976 
1977     if (local_err) {
1978         error_propagate(errp, local_err);
1979     } else {
1980         error_setg(errp,
1981                    "the helper program '%s' returned an unexpected exit"
1982                    " status code (%d)", "pm-is-supported", status);
1983     }
1984 
1985     return false;
1986 }
1987 
1988 static void pmutils_suspend(SuspendMode mode, Error **errp)
1989 {
1990     Error *local_err = NULL;
1991     const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend",
1992                                        "pm-suspend-hybrid"};
1993     const char *cmd[2] = {pmutils_binaries[mode], NULL};
1994     int status;
1995 
1996     status = run_process_child(cmd, &local_err);
1997 
1998     if (status == 0) {
1999         return;
2000     }
2001 
2002     if ((status == -1) && !local_err) {
2003         error_setg(errp, "the helper program '%s' was not found",
2004                    pmutils_binaries[mode]);
2005         return;
2006     }
2007 
2008     if (local_err) {
2009         error_propagate(errp, local_err);
2010     } else {
2011         error_setg(errp,
2012                    "the helper program '%s' returned an unexpected exit"
2013                    " status code (%d)", pmutils_binaries[mode], status);
2014     }
2015 }
2016 
2017 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp)
2018 {
2019     const char *sysfile_strs[3] = {"disk", "mem", NULL};
2020     const char *sysfile_str = sysfile_strs[mode];
2021     char buf[32]; /* hopefully big enough */
2022     int fd;
2023     ssize_t ret;
2024 
2025     if (!sysfile_str) {
2026         error_setg(errp, "unknown guest suspend mode");
2027         return false;
2028     }
2029 
2030     fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
2031     if (fd < 0) {
2032         return false;
2033     }
2034 
2035     ret = read(fd, buf, sizeof(buf) - 1);
2036     close(fd);
2037     if (ret <= 0) {
2038         return false;
2039     }
2040     buf[ret] = '\0';
2041 
2042     if (strstr(buf, sysfile_str)) {
2043         return true;
2044     }
2045     return false;
2046 }
2047 
2048 static void linux_sys_state_suspend(SuspendMode mode, Error **errp)
2049 {
2050     Error *local_err = NULL;
2051     const char *sysfile_strs[3] = {"disk", "mem", NULL};
2052     const char *sysfile_str = sysfile_strs[mode];
2053     pid_t pid;
2054     int status;
2055 
2056     if (!sysfile_str) {
2057         error_setg(errp, "unknown guest suspend mode");
2058         return;
2059     }
2060 
2061     pid = fork();
2062     if (!pid) {
2063         /* child */
2064         int fd;
2065 
2066         setsid();
2067         reopen_fd_to_null(0);
2068         reopen_fd_to_null(1);
2069         reopen_fd_to_null(2);
2070 
2071         fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
2072         if (fd < 0) {
2073             _exit(EXIT_FAILURE);
2074         }
2075 
2076         if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
2077             _exit(EXIT_FAILURE);
2078         }
2079 
2080         _exit(EXIT_SUCCESS);
2081     } else if (pid < 0) {
2082         error_setg_errno(errp, errno, "failed to create child process");
2083         return;
2084     }
2085 
2086     ga_wait_child(pid, &status, &local_err);
2087     if (local_err) {
2088         error_propagate(errp, local_err);
2089         return;
2090     }
2091 
2092     if (WEXITSTATUS(status)) {
2093         error_setg(errp, "child process has failed to suspend");
2094     }
2095 
2096 }
2097 
2098 static void guest_suspend(SuspendMode mode, Error **errp)
2099 {
2100     Error *local_err = NULL;
2101     bool mode_supported = false;
2102 
2103     if (systemd_supports_mode(mode, &local_err)) {
2104         mode_supported = true;
2105         systemd_suspend(mode, &local_err);
2106     }
2107 
2108     if (!local_err) {
2109         return;
2110     }
2111 
2112     error_free(local_err);
2113     local_err = NULL;
2114 
2115     if (pmutils_supports_mode(mode, &local_err)) {
2116         mode_supported = true;
2117         pmutils_suspend(mode, &local_err);
2118     }
2119 
2120     if (!local_err) {
2121         return;
2122     }
2123 
2124     error_free(local_err);
2125     local_err = NULL;
2126 
2127     if (linux_sys_state_supports_mode(mode, &local_err)) {
2128         mode_supported = true;
2129         linux_sys_state_suspend(mode, &local_err);
2130     }
2131 
2132     if (!mode_supported) {
2133         error_free(local_err);
2134         error_setg(errp,
2135                    "the requested suspend mode is not supported by the guest");
2136     } else {
2137         error_propagate(errp, local_err);
2138     }
2139 }
2140 
2141 void qmp_guest_suspend_disk(Error **errp)
2142 {
2143     guest_suspend(SUSPEND_MODE_DISK, errp);
2144 }
2145 
2146 void qmp_guest_suspend_ram(Error **errp)
2147 {
2148     guest_suspend(SUSPEND_MODE_RAM, errp);
2149 }
2150 
2151 void qmp_guest_suspend_hybrid(Error **errp)
2152 {
2153     guest_suspend(SUSPEND_MODE_HYBRID, errp);
2154 }
2155 
2156 static GuestNetworkInterfaceList *
2157 guest_find_interface(GuestNetworkInterfaceList *head,
2158                      const char *name)
2159 {
2160     for (; head; head = head->next) {
2161         if (strcmp(head->value->name, name) == 0) {
2162             break;
2163         }
2164     }
2165 
2166     return head;
2167 }
2168 
2169 static int guest_get_network_stats(const char *name,
2170                        GuestNetworkInterfaceStat *stats)
2171 {
2172     int name_len;
2173     char const *devinfo = "/proc/net/dev";
2174     FILE *fp;
2175     char *line = NULL, *colon;
2176     size_t n = 0;
2177     fp = fopen(devinfo, "r");
2178     if (!fp) {
2179         return -1;
2180     }
2181     name_len = strlen(name);
2182     while (getline(&line, &n, fp) != -1) {
2183         long long dummy;
2184         long long rx_bytes;
2185         long long rx_packets;
2186         long long rx_errs;
2187         long long rx_dropped;
2188         long long tx_bytes;
2189         long long tx_packets;
2190         long long tx_errs;
2191         long long tx_dropped;
2192         char *trim_line;
2193         trim_line = g_strchug(line);
2194         if (trim_line[0] == '\0') {
2195             continue;
2196         }
2197         colon = strchr(trim_line, ':');
2198         if (!colon) {
2199             continue;
2200         }
2201         if (colon - name_len  == trim_line &&
2202            strncmp(trim_line, name, name_len) == 0) {
2203             if (sscanf(colon + 1,
2204                 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
2205                   &rx_bytes, &rx_packets, &rx_errs, &rx_dropped,
2206                   &dummy, &dummy, &dummy, &dummy,
2207                   &tx_bytes, &tx_packets, &tx_errs, &tx_dropped,
2208                   &dummy, &dummy, &dummy, &dummy) != 16) {
2209                 continue;
2210             }
2211             stats->rx_bytes = rx_bytes;
2212             stats->rx_packets = rx_packets;
2213             stats->rx_errs = rx_errs;
2214             stats->rx_dropped = rx_dropped;
2215             stats->tx_bytes = tx_bytes;
2216             stats->tx_packets = tx_packets;
2217             stats->tx_errs = tx_errs;
2218             stats->tx_dropped = tx_dropped;
2219             fclose(fp);
2220             g_free(line);
2221             return 0;
2222         }
2223     }
2224     fclose(fp);
2225     g_free(line);
2226     g_debug("/proc/net/dev: Interface '%s' not found", name);
2227     return -1;
2228 }
2229 
2230 /*
2231  * Build information about guest interfaces
2232  */
2233 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2234 {
2235     GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
2236     struct ifaddrs *ifap, *ifa;
2237 
2238     if (getifaddrs(&ifap) < 0) {
2239         error_setg_errno(errp, errno, "getifaddrs failed");
2240         goto error;
2241     }
2242 
2243     for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
2244         GuestNetworkInterfaceList *info;
2245         GuestIpAddressList **address_list = NULL, *address_item = NULL;
2246         GuestNetworkInterfaceStat  *interface_stat = NULL;
2247         char addr4[INET_ADDRSTRLEN];
2248         char addr6[INET6_ADDRSTRLEN];
2249         int sock;
2250         struct ifreq ifr;
2251         unsigned char *mac_addr;
2252         void *p;
2253 
2254         g_debug("Processing %s interface", ifa->ifa_name);
2255 
2256         info = guest_find_interface(head, ifa->ifa_name);
2257 
2258         if (!info) {
2259             info = g_malloc0(sizeof(*info));
2260             info->value = g_malloc0(sizeof(*info->value));
2261             info->value->name = g_strdup(ifa->ifa_name);
2262 
2263             if (!cur_item) {
2264                 head = cur_item = info;
2265             } else {
2266                 cur_item->next = info;
2267                 cur_item = info;
2268             }
2269         }
2270 
2271         if (!info->value->has_hardware_address &&
2272             ifa->ifa_flags & SIOCGIFHWADDR) {
2273             /* we haven't obtained HW address yet */
2274             sock = socket(PF_INET, SOCK_STREAM, 0);
2275             if (sock == -1) {
2276                 error_setg_errno(errp, errno, "failed to create socket");
2277                 goto error;
2278             }
2279 
2280             memset(&ifr, 0, sizeof(ifr));
2281             pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
2282             if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
2283                 error_setg_errno(errp, errno,
2284                                  "failed to get MAC address of %s",
2285                                  ifa->ifa_name);
2286                 close(sock);
2287                 goto error;
2288             }
2289 
2290             close(sock);
2291             mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
2292 
2293             info->value->hardware_address =
2294                 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
2295                                 (int) mac_addr[0], (int) mac_addr[1],
2296                                 (int) mac_addr[2], (int) mac_addr[3],
2297                                 (int) mac_addr[4], (int) mac_addr[5]);
2298 
2299             info->value->has_hardware_address = true;
2300         }
2301 
2302         if (ifa->ifa_addr &&
2303             ifa->ifa_addr->sa_family == AF_INET) {
2304             /* interface with IPv4 address */
2305             p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
2306             if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
2307                 error_setg_errno(errp, errno, "inet_ntop failed");
2308                 goto error;
2309             }
2310 
2311             address_item = g_malloc0(sizeof(*address_item));
2312             address_item->value = g_malloc0(sizeof(*address_item->value));
2313             address_item->value->ip_address = g_strdup(addr4);
2314             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
2315 
2316             if (ifa->ifa_netmask) {
2317                 /* Count the number of set bits in netmask.
2318                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
2319                 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
2320                 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
2321             }
2322         } else if (ifa->ifa_addr &&
2323                    ifa->ifa_addr->sa_family == AF_INET6) {
2324             /* interface with IPv6 address */
2325             p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
2326             if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
2327                 error_setg_errno(errp, errno, "inet_ntop failed");
2328                 goto error;
2329             }
2330 
2331             address_item = g_malloc0(sizeof(*address_item));
2332             address_item->value = g_malloc0(sizeof(*address_item->value));
2333             address_item->value->ip_address = g_strdup(addr6);
2334             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
2335 
2336             if (ifa->ifa_netmask) {
2337                 /* Count the number of set bits in netmask.
2338                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
2339                 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
2340                 address_item->value->prefix =
2341                     ctpop32(((uint32_t *) p)[0]) +
2342                     ctpop32(((uint32_t *) p)[1]) +
2343                     ctpop32(((uint32_t *) p)[2]) +
2344                     ctpop32(((uint32_t *) p)[3]);
2345             }
2346         }
2347 
2348         if (!address_item) {
2349             continue;
2350         }
2351 
2352         address_list = &info->value->ip_addresses;
2353 
2354         while (*address_list && (*address_list)->next) {
2355             address_list = &(*address_list)->next;
2356         }
2357 
2358         if (!*address_list) {
2359             *address_list = address_item;
2360         } else {
2361             (*address_list)->next = address_item;
2362         }
2363 
2364         info->value->has_ip_addresses = true;
2365 
2366         if (!info->value->has_statistics) {
2367             interface_stat = g_malloc0(sizeof(*interface_stat));
2368             if (guest_get_network_stats(info->value->name,
2369                 interface_stat) == -1) {
2370                 info->value->has_statistics = false;
2371                 g_free(interface_stat);
2372             } else {
2373                 info->value->statistics = interface_stat;
2374                 info->value->has_statistics = true;
2375             }
2376         }
2377     }
2378 
2379     freeifaddrs(ifap);
2380     return head;
2381 
2382 error:
2383     freeifaddrs(ifap);
2384     qapi_free_GuestNetworkInterfaceList(head);
2385     return NULL;
2386 }
2387 
2388 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
2389 
2390 static long sysconf_exact(int name, const char *name_str, Error **errp)
2391 {
2392     long ret;
2393 
2394     errno = 0;
2395     ret = sysconf(name);
2396     if (ret == -1) {
2397         if (errno == 0) {
2398             error_setg(errp, "sysconf(%s): value indefinite", name_str);
2399         } else {
2400             error_setg_errno(errp, errno, "sysconf(%s)", name_str);
2401         }
2402     }
2403     return ret;
2404 }
2405 
2406 /* Transfer online/offline status between @vcpu and the guest system.
2407  *
2408  * On input either @errp or *@errp must be NULL.
2409  *
2410  * In system-to-@vcpu direction, the following @vcpu fields are accessed:
2411  * - R: vcpu->logical_id
2412  * - W: vcpu->online
2413  * - W: vcpu->can_offline
2414  *
2415  * In @vcpu-to-system direction, the following @vcpu fields are accessed:
2416  * - R: vcpu->logical_id
2417  * - R: vcpu->online
2418  *
2419  * Written members remain unmodified on error.
2420  */
2421 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
2422                           char *dirpath, Error **errp)
2423 {
2424     int fd;
2425     int res;
2426     int dirfd;
2427     static const char fn[] = "online";
2428 
2429     dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2430     if (dirfd == -1) {
2431         error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2432         return;
2433     }
2434 
2435     fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
2436     if (fd == -1) {
2437         if (errno != ENOENT) {
2438             error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
2439         } else if (sys2vcpu) {
2440             vcpu->online = true;
2441             vcpu->can_offline = false;
2442         } else if (!vcpu->online) {
2443             error_setg(errp, "logical processor #%" PRId64 " can't be "
2444                        "offlined", vcpu->logical_id);
2445         } /* otherwise pretend successful re-onlining */
2446     } else {
2447         unsigned char status;
2448 
2449         res = pread(fd, &status, 1, 0);
2450         if (res == -1) {
2451             error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
2452         } else if (res == 0) {
2453             error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
2454                        fn);
2455         } else if (sys2vcpu) {
2456             vcpu->online = (status != '0');
2457             vcpu->can_offline = true;
2458         } else if (vcpu->online != (status != '0')) {
2459             status = '0' + vcpu->online;
2460             if (pwrite(fd, &status, 1, 0) == -1) {
2461                 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
2462                                  fn);
2463             }
2464         } /* otherwise pretend successful re-(on|off)-lining */
2465 
2466         res = close(fd);
2467         g_assert(res == 0);
2468     }
2469 
2470     res = close(dirfd);
2471     g_assert(res == 0);
2472 }
2473 
2474 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2475 {
2476     int64_t current;
2477     GuestLogicalProcessorList *head, **tail;
2478     long sc_max;
2479     Error *local_err = NULL;
2480 
2481     current = 0;
2482     head = NULL;
2483     tail = &head;
2484     sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
2485 
2486     while (local_err == NULL && current < sc_max) {
2487         GuestLogicalProcessor *vcpu;
2488         int64_t id = current++;
2489         char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
2490                                      id);
2491 
2492         if (g_file_test(path, G_FILE_TEST_EXISTS)) {
2493             vcpu = g_malloc0(sizeof *vcpu);
2494             vcpu->logical_id = id;
2495             vcpu->has_can_offline = true; /* lolspeak ftw */
2496             transfer_vcpu(vcpu, true, path, &local_err);
2497             QAPI_LIST_APPEND(tail, vcpu);
2498         }
2499         g_free(path);
2500     }
2501 
2502     if (local_err == NULL) {
2503         /* there's no guest with zero VCPUs */
2504         g_assert(head != NULL);
2505         return head;
2506     }
2507 
2508     qapi_free_GuestLogicalProcessorList(head);
2509     error_propagate(errp, local_err);
2510     return NULL;
2511 }
2512 
2513 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2514 {
2515     int64_t processed;
2516     Error *local_err = NULL;
2517 
2518     processed = 0;
2519     while (vcpus != NULL) {
2520         char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
2521                                      vcpus->value->logical_id);
2522 
2523         transfer_vcpu(vcpus->value, false, path, &local_err);
2524         g_free(path);
2525         if (local_err != NULL) {
2526             break;
2527         }
2528         ++processed;
2529         vcpus = vcpus->next;
2530     }
2531 
2532     if (local_err != NULL) {
2533         if (processed == 0) {
2534             error_propagate(errp, local_err);
2535         } else {
2536             error_free(local_err);
2537         }
2538     }
2539 
2540     return processed;
2541 }
2542 
2543 void qmp_guest_set_user_password(const char *username,
2544                                  const char *password,
2545                                  bool crypted,
2546                                  Error **errp)
2547 {
2548     Error *local_err = NULL;
2549     char *passwd_path = NULL;
2550     pid_t pid;
2551     int status;
2552     int datafd[2] = { -1, -1 };
2553     char *rawpasswddata = NULL;
2554     size_t rawpasswdlen;
2555     char *chpasswddata = NULL;
2556     size_t chpasswdlen;
2557 
2558     rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp);
2559     if (!rawpasswddata) {
2560         return;
2561     }
2562     rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
2563     rawpasswddata[rawpasswdlen] = '\0';
2564 
2565     if (strchr(rawpasswddata, '\n')) {
2566         error_setg(errp, "forbidden characters in raw password");
2567         goto out;
2568     }
2569 
2570     if (strchr(username, '\n') ||
2571         strchr(username, ':')) {
2572         error_setg(errp, "forbidden characters in username");
2573         goto out;
2574     }
2575 
2576     chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
2577     chpasswdlen = strlen(chpasswddata);
2578 
2579     passwd_path = g_find_program_in_path("chpasswd");
2580 
2581     if (!passwd_path) {
2582         error_setg(errp, "cannot find 'passwd' program in PATH");
2583         goto out;
2584     }
2585 
2586     if (pipe(datafd) < 0) {
2587         error_setg(errp, "cannot create pipe FDs");
2588         goto out;
2589     }
2590 
2591     pid = fork();
2592     if (pid == 0) {
2593         close(datafd[1]);
2594         /* child */
2595         setsid();
2596         dup2(datafd[0], 0);
2597         reopen_fd_to_null(1);
2598         reopen_fd_to_null(2);
2599 
2600         if (crypted) {
2601             execle(passwd_path, "chpasswd", "-e", NULL, environ);
2602         } else {
2603             execle(passwd_path, "chpasswd", NULL, environ);
2604         }
2605         _exit(EXIT_FAILURE);
2606     } else if (pid < 0) {
2607         error_setg_errno(errp, errno, "failed to create child process");
2608         goto out;
2609     }
2610     close(datafd[0]);
2611     datafd[0] = -1;
2612 
2613     if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
2614         error_setg_errno(errp, errno, "cannot write new account password");
2615         goto out;
2616     }
2617     close(datafd[1]);
2618     datafd[1] = -1;
2619 
2620     ga_wait_child(pid, &status, &local_err);
2621     if (local_err) {
2622         error_propagate(errp, local_err);
2623         goto out;
2624     }
2625 
2626     if (!WIFEXITED(status)) {
2627         error_setg(errp, "child process has terminated abnormally");
2628         goto out;
2629     }
2630 
2631     if (WEXITSTATUS(status)) {
2632         error_setg(errp, "child process has failed to set user password");
2633         goto out;
2634     }
2635 
2636 out:
2637     g_free(chpasswddata);
2638     g_free(rawpasswddata);
2639     g_free(passwd_path);
2640     if (datafd[0] != -1) {
2641         close(datafd[0]);
2642     }
2643     if (datafd[1] != -1) {
2644         close(datafd[1]);
2645     }
2646 }
2647 
2648 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
2649                                int size, Error **errp)
2650 {
2651     int fd;
2652     int res;
2653 
2654     errno = 0;
2655     fd = openat(dirfd, pathname, O_RDONLY);
2656     if (fd == -1) {
2657         error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2658         return;
2659     }
2660 
2661     res = pread(fd, buf, size, 0);
2662     if (res == -1) {
2663         error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
2664     } else if (res == 0) {
2665         error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
2666     }
2667     close(fd);
2668 }
2669 
2670 static void ga_write_sysfs_file(int dirfd, const char *pathname,
2671                                 const char *buf, int size, Error **errp)
2672 {
2673     int fd;
2674 
2675     errno = 0;
2676     fd = openat(dirfd, pathname, O_WRONLY);
2677     if (fd == -1) {
2678         error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2679         return;
2680     }
2681 
2682     if (pwrite(fd, buf, size, 0) == -1) {
2683         error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
2684     }
2685 
2686     close(fd);
2687 }
2688 
2689 /* Transfer online/offline status between @mem_blk and the guest system.
2690  *
2691  * On input either @errp or *@errp must be NULL.
2692  *
2693  * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
2694  * - R: mem_blk->phys_index
2695  * - W: mem_blk->online
2696  * - W: mem_blk->can_offline
2697  *
2698  * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
2699  * - R: mem_blk->phys_index
2700  * - R: mem_blk->online
2701  *-  R: mem_blk->can_offline
2702  * Written members remain unmodified on error.
2703  */
2704 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
2705                                   GuestMemoryBlockResponse *result,
2706                                   Error **errp)
2707 {
2708     char *dirpath;
2709     int dirfd;
2710     char *status;
2711     Error *local_err = NULL;
2712 
2713     if (!sys2memblk) {
2714         DIR *dp;
2715 
2716         if (!result) {
2717             error_setg(errp, "Internal error, 'result' should not be NULL");
2718             return;
2719         }
2720         errno = 0;
2721         dp = opendir("/sys/devices/system/memory/");
2722          /* if there is no 'memory' directory in sysfs,
2723          * we think this VM does not support online/offline memory block,
2724          * any other solution?
2725          */
2726         if (!dp) {
2727             if (errno == ENOENT) {
2728                 result->response =
2729                     GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2730             }
2731             goto out1;
2732         }
2733         closedir(dp);
2734     }
2735 
2736     dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
2737                               mem_blk->phys_index);
2738     dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2739     if (dirfd == -1) {
2740         if (sys2memblk) {
2741             error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2742         } else {
2743             if (errno == ENOENT) {
2744                 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
2745             } else {
2746                 result->response =
2747                     GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2748             }
2749         }
2750         g_free(dirpath);
2751         goto out1;
2752     }
2753     g_free(dirpath);
2754 
2755     status = g_malloc0(10);
2756     ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
2757     if (local_err) {
2758         /* treat with sysfs file that not exist in old kernel */
2759         if (errno == ENOENT) {
2760             error_free(local_err);
2761             if (sys2memblk) {
2762                 mem_blk->online = true;
2763                 mem_blk->can_offline = false;
2764             } else if (!mem_blk->online) {
2765                 result->response =
2766                     GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2767             }
2768         } else {
2769             if (sys2memblk) {
2770                 error_propagate(errp, local_err);
2771             } else {
2772                 error_free(local_err);
2773                 result->response =
2774                     GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2775             }
2776         }
2777         goto out2;
2778     }
2779 
2780     if (sys2memblk) {
2781         char removable = '0';
2782 
2783         mem_blk->online = (strncmp(status, "online", 6) == 0);
2784 
2785         ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
2786         if (local_err) {
2787             /* if no 'removable' file, it doesn't support offline mem blk */
2788             if (errno == ENOENT) {
2789                 error_free(local_err);
2790                 mem_blk->can_offline = false;
2791             } else {
2792                 error_propagate(errp, local_err);
2793             }
2794         } else {
2795             mem_blk->can_offline = (removable != '0');
2796         }
2797     } else {
2798         if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
2799             const char *new_state = mem_blk->online ? "online" : "offline";
2800 
2801             ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
2802                                 &local_err);
2803             if (local_err) {
2804                 error_free(local_err);
2805                 result->response =
2806                     GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2807                 goto out2;
2808             }
2809 
2810             result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
2811             result->has_error_code = false;
2812         } /* otherwise pretend successful re-(on|off)-lining */
2813     }
2814     g_free(status);
2815     close(dirfd);
2816     return;
2817 
2818 out2:
2819     g_free(status);
2820     close(dirfd);
2821 out1:
2822     if (!sys2memblk) {
2823         result->has_error_code = true;
2824         result->error_code = errno;
2825     }
2826 }
2827 
2828 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2829 {
2830     GuestMemoryBlockList *head, **tail;
2831     Error *local_err = NULL;
2832     struct dirent *de;
2833     DIR *dp;
2834 
2835     head = NULL;
2836     tail = &head;
2837 
2838     dp = opendir("/sys/devices/system/memory/");
2839     if (!dp) {
2840         /* it's ok if this happens to be a system that doesn't expose
2841          * memory blocks via sysfs, but otherwise we should report
2842          * an error
2843          */
2844         if (errno != ENOENT) {
2845             error_setg_errno(errp, errno, "Can't open directory"
2846                              "\"/sys/devices/system/memory/\"");
2847         }
2848         return NULL;
2849     }
2850 
2851     /* Note: the phys_index of memory block may be discontinuous,
2852      * this is because a memblk is the unit of the Sparse Memory design, which
2853      * allows discontinuous memory ranges (ex. NUMA), so here we should
2854      * traverse the memory block directory.
2855      */
2856     while ((de = readdir(dp)) != NULL) {
2857         GuestMemoryBlock *mem_blk;
2858 
2859         if ((strncmp(de->d_name, "memory", 6) != 0) ||
2860             !(de->d_type & DT_DIR)) {
2861             continue;
2862         }
2863 
2864         mem_blk = g_malloc0(sizeof *mem_blk);
2865         /* The d_name is "memoryXXX",  phys_index is block id, same as XXX */
2866         mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
2867         mem_blk->has_can_offline = true; /* lolspeak ftw */
2868         transfer_memory_block(mem_blk, true, NULL, &local_err);
2869         if (local_err) {
2870             break;
2871         }
2872 
2873         QAPI_LIST_APPEND(tail, mem_blk);
2874     }
2875 
2876     closedir(dp);
2877     if (local_err == NULL) {
2878         /* there's no guest with zero memory blocks */
2879         if (head == NULL) {
2880             error_setg(errp, "guest reported zero memory blocks!");
2881         }
2882         return head;
2883     }
2884 
2885     qapi_free_GuestMemoryBlockList(head);
2886     error_propagate(errp, local_err);
2887     return NULL;
2888 }
2889 
2890 GuestMemoryBlockResponseList *
2891 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2892 {
2893     GuestMemoryBlockResponseList *head, **tail;
2894     Error *local_err = NULL;
2895 
2896     head = NULL;
2897     tail = &head;
2898 
2899     while (mem_blks != NULL) {
2900         GuestMemoryBlockResponse *result;
2901         GuestMemoryBlock *current_mem_blk = mem_blks->value;
2902 
2903         result = g_malloc0(sizeof(*result));
2904         result->phys_index = current_mem_blk->phys_index;
2905         transfer_memory_block(current_mem_blk, false, result, &local_err);
2906         if (local_err) { /* should never happen */
2907             goto err;
2908         }
2909 
2910         QAPI_LIST_APPEND(tail, result);
2911         mem_blks = mem_blks->next;
2912     }
2913 
2914     return head;
2915 err:
2916     qapi_free_GuestMemoryBlockResponseList(head);
2917     error_propagate(errp, local_err);
2918     return NULL;
2919 }
2920 
2921 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2922 {
2923     Error *local_err = NULL;
2924     char *dirpath;
2925     int dirfd;
2926     char *buf;
2927     GuestMemoryBlockInfo *info;
2928 
2929     dirpath = g_strdup_printf("/sys/devices/system/memory/");
2930     dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2931     if (dirfd == -1) {
2932         error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2933         g_free(dirpath);
2934         return NULL;
2935     }
2936     g_free(dirpath);
2937 
2938     buf = g_malloc0(20);
2939     ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
2940     close(dirfd);
2941     if (local_err) {
2942         g_free(buf);
2943         error_propagate(errp, local_err);
2944         return NULL;
2945     }
2946 
2947     info = g_new0(GuestMemoryBlockInfo, 1);
2948     info->size = strtol(buf, NULL, 16); /* the unit is bytes */
2949 
2950     g_free(buf);
2951 
2952     return info;
2953 }
2954 
2955 #else /* defined(__linux__) */
2956 
2957 void qmp_guest_suspend_disk(Error **errp)
2958 {
2959     error_setg(errp, QERR_UNSUPPORTED);
2960 }
2961 
2962 void qmp_guest_suspend_ram(Error **errp)
2963 {
2964     error_setg(errp, QERR_UNSUPPORTED);
2965 }
2966 
2967 void qmp_guest_suspend_hybrid(Error **errp)
2968 {
2969     error_setg(errp, QERR_UNSUPPORTED);
2970 }
2971 
2972 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2973 {
2974     error_setg(errp, QERR_UNSUPPORTED);
2975     return NULL;
2976 }
2977 
2978 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2979 {
2980     error_setg(errp, QERR_UNSUPPORTED);
2981     return NULL;
2982 }
2983 
2984 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2985 {
2986     error_setg(errp, QERR_UNSUPPORTED);
2987     return -1;
2988 }
2989 
2990 void qmp_guest_set_user_password(const char *username,
2991                                  const char *password,
2992                                  bool crypted,
2993                                  Error **errp)
2994 {
2995     error_setg(errp, QERR_UNSUPPORTED);
2996 }
2997 
2998 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2999 {
3000     error_setg(errp, QERR_UNSUPPORTED);
3001     return NULL;
3002 }
3003 
3004 GuestMemoryBlockResponseList *
3005 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
3006 {
3007     error_setg(errp, QERR_UNSUPPORTED);
3008     return NULL;
3009 }
3010 
3011 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
3012 {
3013     error_setg(errp, QERR_UNSUPPORTED);
3014     return NULL;
3015 }
3016 
3017 #endif
3018 
3019 #if !defined(CONFIG_FSFREEZE)
3020 
3021 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
3022 {
3023     error_setg(errp, QERR_UNSUPPORTED);
3024     return NULL;
3025 }
3026 
3027 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
3028 {
3029     error_setg(errp, QERR_UNSUPPORTED);
3030 
3031     return 0;
3032 }
3033 
3034 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
3035 {
3036     error_setg(errp, QERR_UNSUPPORTED);
3037 
3038     return 0;
3039 }
3040 
3041 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
3042                                        strList *mountpoints,
3043                                        Error **errp)
3044 {
3045     error_setg(errp, QERR_UNSUPPORTED);
3046 
3047     return 0;
3048 }
3049 
3050 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
3051 {
3052     error_setg(errp, QERR_UNSUPPORTED);
3053 
3054     return 0;
3055 }
3056 
3057 GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
3058 {
3059     error_setg(errp, QERR_UNSUPPORTED);
3060     return NULL;
3061 }
3062 
3063 #endif /* CONFIG_FSFREEZE */
3064 
3065 #if !defined(CONFIG_FSTRIM)
3066 GuestFilesystemTrimResponse *
3067 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
3068 {
3069     error_setg(errp, QERR_UNSUPPORTED);
3070     return NULL;
3071 }
3072 #endif
3073 
3074 /* add unsupported commands to the blacklist */
3075 GList *ga_command_blacklist_init(GList *blacklist)
3076 {
3077 #if !defined(__linux__)
3078     {
3079         const char *list[] = {
3080             "guest-suspend-disk", "guest-suspend-ram",
3081             "guest-suspend-hybrid", "guest-network-get-interfaces",
3082             "guest-get-vcpus", "guest-set-vcpus",
3083             "guest-get-memory-blocks", "guest-set-memory-blocks",
3084             "guest-get-memory-block-size", "guest-get-memory-block-info",
3085             NULL};
3086         char **p = (char **)list;
3087 
3088         while (*p) {
3089             blacklist = g_list_append(blacklist, g_strdup(*p++));
3090         }
3091     }
3092 #endif
3093 
3094 #if !defined(CONFIG_FSFREEZE)
3095     {
3096         const char *list[] = {
3097             "guest-get-fsinfo", "guest-fsfreeze-status",
3098             "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
3099             "guest-fsfreeze-thaw", "guest-get-fsinfo",
3100             "guest-get-disks", NULL};
3101         char **p = (char **)list;
3102 
3103         while (*p) {
3104             blacklist = g_list_append(blacklist, g_strdup(*p++));
3105         }
3106     }
3107 #endif
3108 
3109 #if !defined(CONFIG_FSTRIM)
3110     blacklist = g_list_append(blacklist, g_strdup("guest-fstrim"));
3111 #endif
3112 
3113     blacklist = g_list_append(blacklist, g_strdup("guest-get-devices"));
3114 
3115     return blacklist;
3116 }
3117 
3118 /* register init/cleanup routines for stateful command groups */
3119 void ga_command_state_init(GAState *s, GACommandState *cs)
3120 {
3121 #if defined(CONFIG_FSFREEZE)
3122     ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
3123 #endif
3124 }
3125 
3126 #ifdef HAVE_UTMPX
3127 
3128 #define QGA_MICRO_SECOND_TO_SECOND 1000000
3129 
3130 static double ga_get_login_time(struct utmpx *user_info)
3131 {
3132     double seconds = (double)user_info->ut_tv.tv_sec;
3133     double useconds = (double)user_info->ut_tv.tv_usec;
3134     useconds /= QGA_MICRO_SECOND_TO_SECOND;
3135     return seconds + useconds;
3136 }
3137 
3138 GuestUserList *qmp_guest_get_users(Error **errp)
3139 {
3140     GHashTable *cache = NULL;
3141     GuestUserList *head = NULL, **tail = &head;
3142     struct utmpx *user_info = NULL;
3143     gpointer value = NULL;
3144     GuestUser *user = NULL;
3145     double login_time = 0;
3146 
3147     cache = g_hash_table_new(g_str_hash, g_str_equal);
3148     setutxent();
3149 
3150     for (;;) {
3151         user_info = getutxent();
3152         if (user_info == NULL) {
3153             break;
3154         } else if (user_info->ut_type != USER_PROCESS) {
3155             continue;
3156         } else if (g_hash_table_contains(cache, user_info->ut_user)) {
3157             value = g_hash_table_lookup(cache, user_info->ut_user);
3158             user = (GuestUser *)value;
3159             login_time = ga_get_login_time(user_info);
3160             /* We're ensuring the earliest login time to be sent */
3161             if (login_time < user->login_time) {
3162                 user->login_time = login_time;
3163             }
3164             continue;
3165         }
3166 
3167         user = g_new0(GuestUser, 1);
3168         user->user = g_strdup(user_info->ut_user);
3169         user->login_time = ga_get_login_time(user_info);
3170 
3171         g_hash_table_insert(cache, user->user, user);
3172 
3173         QAPI_LIST_APPEND(tail, user);
3174     }
3175     endutxent();
3176     g_hash_table_destroy(cache);
3177     return head;
3178 }
3179 
3180 #else
3181 
3182 GuestUserList *qmp_guest_get_users(Error **errp)
3183 {
3184     error_setg(errp, QERR_UNSUPPORTED);
3185     return NULL;
3186 }
3187 
3188 #endif
3189 
3190 /* Replace escaped special characters with theire real values. The replacement
3191  * is done in place -- returned value is in the original string.
3192  */
3193 static void ga_osrelease_replace_special(gchar *value)
3194 {
3195     gchar *p, *p2, quote;
3196 
3197     /* Trim the string at first space or semicolon if it is not enclosed in
3198      * single or double quotes. */
3199     if ((value[0] != '"') || (value[0] == '\'')) {
3200         p = strchr(value, ' ');
3201         if (p != NULL) {
3202             *p = 0;
3203         }
3204         p = strchr(value, ';');
3205         if (p != NULL) {
3206             *p = 0;
3207         }
3208         return;
3209     }
3210 
3211     quote = value[0];
3212     p2 = value;
3213     p = value + 1;
3214     while (*p != 0) {
3215         if (*p == '\\') {
3216             p++;
3217             switch (*p) {
3218             case '$':
3219             case '\'':
3220             case '"':
3221             case '\\':
3222             case '`':
3223                 break;
3224             default:
3225                 /* Keep literal backslash followed by whatever is there */
3226                 p--;
3227                 break;
3228             }
3229         } else if (*p == quote) {
3230             *p2 = 0;
3231             break;
3232         }
3233         *(p2++) = *(p++);
3234     }
3235 }
3236 
3237 static GKeyFile *ga_parse_osrelease(const char *fname)
3238 {
3239     gchar *content = NULL;
3240     gchar *content2 = NULL;
3241     GError *err = NULL;
3242     GKeyFile *keys = g_key_file_new();
3243     const char *group = "[os-release]\n";
3244 
3245     if (!g_file_get_contents(fname, &content, NULL, &err)) {
3246         slog("failed to read '%s', error: %s", fname, err->message);
3247         goto fail;
3248     }
3249 
3250     if (!g_utf8_validate(content, -1, NULL)) {
3251         slog("file is not utf-8 encoded: %s", fname);
3252         goto fail;
3253     }
3254     content2 = g_strdup_printf("%s%s", group, content);
3255 
3256     if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE,
3257                                    &err)) {
3258         slog("failed to parse file '%s', error: %s", fname, err->message);
3259         goto fail;
3260     }
3261 
3262     g_free(content);
3263     g_free(content2);
3264     return keys;
3265 
3266 fail:
3267     g_error_free(err);
3268     g_free(content);
3269     g_free(content2);
3270     g_key_file_free(keys);
3271     return NULL;
3272 }
3273 
3274 GuestOSInfo *qmp_guest_get_osinfo(Error **errp)
3275 {
3276     GuestOSInfo *info = NULL;
3277     struct utsname kinfo;
3278     GKeyFile *osrelease = NULL;
3279     const char *qga_os_release = g_getenv("QGA_OS_RELEASE");
3280 
3281     info = g_new0(GuestOSInfo, 1);
3282 
3283     if (uname(&kinfo) != 0) {
3284         error_setg_errno(errp, errno, "uname failed");
3285     } else {
3286         info->has_kernel_version = true;
3287         info->kernel_version = g_strdup(kinfo.version);
3288         info->has_kernel_release = true;
3289         info->kernel_release = g_strdup(kinfo.release);
3290         info->has_machine = true;
3291         info->machine = g_strdup(kinfo.machine);
3292     }
3293 
3294     if (qga_os_release != NULL) {
3295         osrelease = ga_parse_osrelease(qga_os_release);
3296     } else {
3297         osrelease = ga_parse_osrelease("/etc/os-release");
3298         if (osrelease == NULL) {
3299             osrelease = ga_parse_osrelease("/usr/lib/os-release");
3300         }
3301     }
3302 
3303     if (osrelease != NULL) {
3304         char *value;
3305 
3306 #define GET_FIELD(field, osfield) do { \
3307     value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \
3308     if (value != NULL) { \
3309         ga_osrelease_replace_special(value); \
3310         info->has_ ## field = true; \
3311         info->field = value; \
3312     } \
3313 } while (0)
3314         GET_FIELD(id, "ID");
3315         GET_FIELD(name, "NAME");
3316         GET_FIELD(pretty_name, "PRETTY_NAME");
3317         GET_FIELD(version, "VERSION");
3318         GET_FIELD(version_id, "VERSION_ID");
3319         GET_FIELD(variant, "VARIANT");
3320         GET_FIELD(variant_id, "VARIANT_ID");
3321 #undef GET_FIELD
3322 
3323         g_key_file_free(osrelease);
3324     }
3325 
3326     return info;
3327 }
3328 
3329 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
3330 {
3331     error_setg(errp, QERR_UNSUPPORTED);
3332 
3333     return NULL;
3334 }
3335