aboutsummaryrefslogtreecommitdiff
path: root/qga/commands-posix.c
blob: dab3bf9c9875629806f930cc46693d3f6a8b19de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
/*
 * QEMU Guest Agent POSIX-specific command implementations
 *
 * Copyright IBM Corp. 2011
 *
 * Authors:
 *  Michael Roth      <mdroth@linux.vnet.ibm.com>
 *  Michal Privoznik  <mprivozn@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include <glib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include "qga/guest-agent-core.h"
#include "qga-qmp-commands.h"
#include "qerror.h"
#include "qemu-queue.h"
#include "host-utils.h"

#ifndef CONFIG_HAS_ENVIRON
extern char **environ;
#endif

#if defined(__linux__)
#include <mntent.h>
#include <linux/fs.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>

#if defined(__linux__) && defined(FIFREEZE)
#define CONFIG_FSFREEZE
#endif
#endif

void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
{
    const char *shutdown_flag;
    pid_t rpid, pid;
    int status;

    slog("guest-shutdown called, mode: %s", mode);
    if (!has_mode || strcmp(mode, "powerdown") == 0) {
        shutdown_flag = "-P";
    } else if (strcmp(mode, "halt") == 0) {
        shutdown_flag = "-H";
    } else if (strcmp(mode, "reboot") == 0) {
        shutdown_flag = "-r";
    } else {
        error_set(err, QERR_INVALID_PARAMETER_VALUE, "mode",
                  "halt|powerdown|reboot");
        return;
    }

    pid = fork();
    if (pid == 0) {
        /* child, start the shutdown */
        setsid();
        reopen_fd_to_null(0);
        reopen_fd_to_null(1);
        reopen_fd_to_null(2);

        execle("/sbin/shutdown", "shutdown", shutdown_flag, "+0",
               "hypervisor initiated shutdown", (char*)NULL, environ);
        _exit(EXIT_FAILURE);
    } else if (pid < 0) {
        goto exit_err;
    }

    do {
        rpid = waitpid(pid, &status, 0);
    } while (rpid == -1 && errno == EINTR);
    if (rpid == pid && WIFEXITED(status) && !WEXITSTATUS(status)) {
        return;
    }

exit_err:
    error_set(err, QERR_UNDEFINED_ERROR);
}

typedef struct GuestFileHandle {
    uint64_t id;
    FILE *fh;
    QTAILQ_ENTRY(GuestFileHandle) next;
} GuestFileHandle;

static struct {
    QTAILQ_HEAD(, GuestFileHandle) filehandles;
} guest_file_state;

static void guest_file_handle_add(FILE *fh)
{
    GuestFileHandle *gfh;

    gfh = g_malloc0(sizeof(GuestFileHandle));
    gfh->id = fileno(fh);
    gfh->fh = fh;
    QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
}

static GuestFileHandle *guest_file_handle_find(int64_t id)
{
    GuestFileHandle *gfh;

    QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
    {
        if (gfh->id == id) {
            return gfh;
        }
    }

    return NULL;
}

int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
{
    FILE *fh;
    int fd;
    int64_t ret = -1;

    if (!has_mode) {
        mode = "r";
    }
    slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
    fh = fopen(path, mode);
    if (!fh) {
        error_set(err, QERR_OPEN_FILE_FAILED, path);
        return -1;
    }

    /* set fd non-blocking to avoid common use cases (like reading from a
     * named pipe) from hanging the agent
     */
    fd = fileno(fh);
    ret = fcntl(fd, F_GETFL);
    ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);
    if (ret == -1) {
        error_set(err, QERR_QGA_COMMAND_FAILED, "fcntl() failed");
        fclose(fh);
        return -1;
    }

    guest_file_handle_add(fh);
    slog("guest-file-open, handle: %d", fd);
    return fd;
}

void qmp_guest_file_close(int64_t handle, Error **err)
{
    GuestFileHandle *gfh = guest_file_handle_find(handle);
    int ret;

    slog("guest-file-close called, handle: %ld", handle);
    if (!gfh) {
        error_set(err, QERR_FD_NOT_FOUND, "handle");
        return;
    }

    ret = fclose(gfh->fh);
    if (ret == -1) {
        error_set(err, QERR_QGA_COMMAND_FAILED, "fclose() failed");
        return;
    }

    QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
    g_free(gfh);
}

struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
                                          int64_t count, Error **err)
{
    GuestFileHandle *gfh = guest_file_handle_find(handle);
    GuestFileRead *read_data = NULL;
    guchar *buf;
    FILE *fh;
    size_t read_count;

    if (!gfh) {
        error_set(err, QERR_FD_NOT_FOUND, "handle");
        return NULL;
    }

    if (!has_count) {
        count = QGA_READ_COUNT_DEFAULT;
    } else if (count < 0) {
        error_set(err, QERR_INVALID_PARAMETER, "count");
        return NULL;
    }

    fh = gfh->fh;
    buf = g_malloc0(count+1);
    read_count = fread(buf, 1, count, fh);
    if (ferror(fh)) {
        slog("guest-file-read failed, handle: %ld", handle);
        error_set(err, QERR_QGA_COMMAND_FAILED, "fread() failed");
    } else {
        buf[read_count] = 0;
        read_data = g_malloc0(sizeof(GuestFileRead));
        read_data->count = read_count;
        read_data->eof = feof(fh);
        if (read_count) {
            read_data->buf_b64 = g_base64_encode(buf, read_count);
        }
    }
    g_free(buf);
    clearerr(fh);

    return read_data;
}

GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
                                     bool has_count, int64_t count, Error **err)
{
    GuestFileWrite *write_data = NULL;
    guchar *buf;
    gsize buf_len;
    int write_count;
    GuestFileHandle *gfh = guest_file_handle_find(handle);
    FILE *fh;

    if (!gfh) {
        error_set(err, QERR_FD_NOT_FOUND, "handle");
        return NULL;
    }

    fh = gfh->fh;
    buf = g_base64_decode(buf_b64, &buf_len);

    if (!has_count) {
        count = buf_len;
    } else if (count < 0 || count > buf_len) {
        g_free(buf);
        error_set(err, QERR_INVALID_PARAMETER, "count");
        return NULL;
    }

    write_count = fwrite(buf, 1, count, fh);
    if (ferror(fh)) {
        slog("guest-file-write failed, handle: %ld", handle);
        error_set(err, QERR_QGA_COMMAND_FAILED, "fwrite() error");
    } else {
        write_data = g_malloc0(sizeof(GuestFileWrite));
        write_data->count = write_count;
        write_data->eof = feof(fh);
    }
    g_free(buf);
    clearerr(fh);

    return write_data;
}

struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
                                          int64_t whence, Error **err)
{
    GuestFileHandle *gfh = guest_file_handle_find(handle);
    GuestFileSeek *seek_data = NULL;
    FILE *fh;
    int ret;

    if (!gfh) {
        error_set(err, QERR_FD_NOT_FOUND, "handle");
        return NULL;
    }

    fh = gfh->fh;
    ret = fseek(fh, offset, whence);
    if (ret == -1) {
        error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));
    } else {
        seek_data = g_malloc0(sizeof(GuestFileRead));
        seek_data->position = ftell(fh);
        seek_data->eof = feof(fh);
    }
    clearerr(fh);

    return seek_data;
}

void qmp_guest_file_flush(int64_t handle, Error **err)
{
    GuestFileHandle *gfh = guest_file_handle_find(handle);
    FILE *fh;
    int ret;

    if (!gfh) {
        error_set(err, QERR_FD_NOT_FOUND, "handle");
        return;
    }

    fh = gfh->fh;
    ret = fflush(fh);
    if (ret == EOF) {
        error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));
    }
}

static void guest_file_init(void)
{
    QTAILQ_INIT(&guest_file_state.filehandles);
}

/* linux-specific implementations. avoid this if at all possible. */
#if defined(__linux__)

#if defined(CONFIG_FSFREEZE)

typedef struct GuestFsfreezeMount {
    char *dirname;
    char *devtype;
    QTAILQ_ENTRY(GuestFsfreezeMount) next;
} GuestFsfreezeMount;

typedef QTAILQ_HEAD(, GuestFsfreezeMount) GuestFsfreezeMountList;

static void guest_fsfreeze_free_mount_list(GuestFsfreezeMountList *mounts)
{
     GuestFsfreezeMount *mount, *temp;

     if (!mounts) {
         return;
     }

     QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
         QTAILQ_REMOVE(mounts, mount, next);
         g_free(mount->dirname);
         g_free(mount->devtype);
         g_free(mount);
     }
}

/*
 * Walk the mount table and build a list of local file systems
 */
static int guest_fsfreeze_build_mount_list(GuestFsfreezeMountList *mounts)
{
    struct mntent *ment;
    GuestFsfreezeMount *mount;
    char const *mtab = MOUNTED;
    FILE *fp;

    fp = setmntent(mtab, "r");
    if (!fp) {
        g_warning("fsfreeze: unable to read mtab");
        return -1;
    }

    while ((ment = getmntent(fp))) {
        /*
         * An entry which device name doesn't start with a '/' is
         * either a dummy file system or a network file system.
         * Add special handling for smbfs and cifs as is done by
         * coreutils as well.
         */
        if ((ment->mnt_fsname[0] != '/') ||
            (strcmp(ment->mnt_type, "smbfs") == 0) ||
            (strcmp(ment->mnt_type, "cifs") == 0)) {
            continue;
        }

        mount = g_malloc0(sizeof(GuestFsfreezeMount));
        mount->dirname = g_strdup(ment->mnt_dir);
        mount->devtype = g_strdup(ment->mnt_type);

        QTAILQ_INSERT_TAIL(mounts, mount, next);
    }

    endmntent(fp);

    return 0;
}

/*
 * Return status of freeze/thaw
 */
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
{
    if (ga_is_frozen(ga_state)) {
        return GUEST_FSFREEZE_STATUS_FROZEN;
    }

    return GUEST_FSFREEZE_STATUS_THAWED;
}

/*
 * Walk list of mounted file systems in the guest, and freeze the ones which
 * are real local file systems.
 */
int64_t qmp_guest_fsfreeze_freeze(Error **err)
{
    int ret = 0, i = 0;
    GuestFsfreezeMountList mounts;
    struct GuestFsfreezeMount *mount;
    int fd;
    char err_msg[512];

    slog("guest-fsfreeze called");

    QTAILQ_INIT(&mounts);
    ret = guest_fsfreeze_build_mount_list(&mounts);
    if (ret < 0) {
        return ret;
    }

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

    QTAILQ_FOREACH(mount, &mounts, next) {
        fd = qemu_open(mount->dirname, O_RDONLY);
        if (fd == -1) {
            sprintf(err_msg, "failed to open %s, %s", mount->dirname,
                    strerror(errno));
            error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
            goto error;
        }

        /* we try to cull filesytems we know won't work in advance, but other
         * filesytems may not implement fsfreeze for less obvious reasons.
         * these will report EOPNOTSUPP. we simply ignore these when tallying
         * the number of frozen filesystems.
         *
         * any other error means a failure to freeze a filesystem we
         * expect to be freezable, so return an error in those cases
         * and return system to thawed state.
         */
        ret = ioctl(fd, FIFREEZE);
        if (ret == -1) {
            if (errno != EOPNOTSUPP) {
                sprintf(err_msg, "failed to freeze %s, %s",
                        mount->dirname, strerror(errno));
                error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
                close(fd);
                goto error;
            }
        } else {
            i++;
        }
        close(fd);
    }

    guest_fsfreeze_free_mount_list(&mounts);
    return i;

error:
    guest_fsfreeze_free_mount_list(&mounts);
    qmp_guest_fsfreeze_thaw(NULL);
    return 0;
}

/*
 * Walk list of frozen file systems in the guest, and thaw them.
 */
int64_t qmp_guest_fsfreeze_thaw(Error **err)
{
    int ret;
    GuestFsfreezeMountList mounts;
    GuestFsfreezeMount *mount;
    int fd, i = 0, logged;

    QTAILQ_INIT(&mounts);
    ret = guest_fsfreeze_build_mount_list(&mounts);
    if (ret) {
        error_set(err, QERR_QGA_COMMAND_FAILED,
                  "failed to enumerate filesystems");
        return 0;
    }

    QTAILQ_FOREACH(mount, &mounts, next) {
        logged = false;
        fd = qemu_open(mount->dirname, O_RDONLY);
        if (fd == -1) {
            continue;
        }
        /* we have no way of knowing whether a filesystem was actually unfrozen
         * as a result of a successful call to FITHAW, only that if an error
         * was returned the filesystem was *not* unfrozen by that particular
         * call.
         *
         * since multiple preceding FIFREEZEs require multiple calls to FITHAW
         * to unfreeze, continuing issuing FITHAW until an error is returned,
         * in which case either the filesystem is in an unfreezable state, or,
         * more likely, it was thawed previously (and remains so afterward).
         *
         * also, since the most recent successful call is the one that did
         * the actual unfreeze, we can use this to provide an accurate count
         * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
         * may * be useful for determining whether a filesystem was unfrozen
         * during the freeze/thaw phase by a process other than qemu-ga.
         */
        do {
            ret = ioctl(fd, FITHAW);
            if (ret == 0 && !logged) {
                i++;
                logged = true;
            }
        } while (ret == 0);
        close(fd);
    }

    ga_unset_frozen(ga_state);
    guest_fsfreeze_free_mount_list(&mounts);
    return i;
}

static void guest_fsfreeze_cleanup(void)
{
    int64_t ret;
    Error *err = NULL;

    if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
        ret = qmp_guest_fsfreeze_thaw(&err);
        if (ret < 0 || err) {
            slog("failed to clean up frozen filesystems");
        }
    }
}
#endif /* CONFIG_FSFREEZE */

#define LINUX_SYS_STATE_FILE "/sys/power/state"
#define SUSPEND_SUPPORTED 0
#define SUSPEND_NOT_SUPPORTED 1

static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
                               const char *sysfile_str, Error **err)
{
    char *pmutils_path;
    pid_t pid, rpid;
    int status;

    pmutils_path = g_find_program_in_path(pmutils_bin);

    pid = fork();
    if (!pid) {
        char buf[32]; /* hopefully big enough */
        ssize_t ret;
        int fd;

        setsid();
        reopen_fd_to_null(0);
        reopen_fd_to_null(1);
        reopen_fd_to_null(2);

        if (pmutils_path) {
            execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
        }

        /*
         * If we get here either pm-utils is not installed or execle() has
         * failed. Let's try the manual method if the caller wants it.
         */

        if (!sysfile_str) {
            _exit(SUSPEND_NOT_SUPPORTED);
        }

        fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
        if (fd < 0) {
            _exit(SUSPEND_NOT_SUPPORTED);
        }

        ret = read(fd, buf, sizeof(buf)-1);
        if (ret <= 0) {
            _exit(SUSPEND_NOT_SUPPORTED);
        }
        buf[ret] = '\0';

        if (strstr(buf, sysfile_str)) {
            _exit(SUSPEND_SUPPORTED);
        }

        _exit(SUSPEND_NOT_SUPPORTED);
    }

    g_free(pmutils_path);

    if (pid < 0) {
        goto undef_err;
    }

    do {
        rpid = waitpid(pid, &status, 0);
    } while (rpid == -1 && errno == EINTR);
    if (rpid == pid && WIFEXITED(status)) {
        switch (WEXITSTATUS(status)) {
        case SUSPEND_SUPPORTED:
            return;
        case SUSPEND_NOT_SUPPORTED:
            error_set(err, QERR_UNSUPPORTED);
            return;
        default:
            goto undef_err;
        }
    }

undef_err:
    error_set(err, QERR_UNDEFINED_ERROR);
}

static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
                          Error **err)
{
    char *pmutils_path;
    pid_t rpid, pid;
    int status;

    pmutils_path = g_find_program_in_path(pmutils_bin);

    pid = fork();
    if (pid == 0) {
        /* child */
        int fd;

        setsid();
        reopen_fd_to_null(0);
        reopen_fd_to_null(1);
        reopen_fd_to_null(2);

        if (pmutils_path) {
            execle(pmutils_path, pmutils_bin, NULL, environ);
        }

        /*
         * If we get here either pm-utils is not installed or execle() has
         * failed. Let's try the manual method if the caller wants it.
         */

        if (!sysfile_str) {
            _exit(EXIT_FAILURE);
        }

        fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
        if (fd < 0) {
            _exit(EXIT_FAILURE);
        }

        if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
            _exit(EXIT_FAILURE);
        }

        _exit(EXIT_SUCCESS);
    }

    g_free(pmutils_path);

    if (pid < 0) {
        goto exit_err;
    }

    do {
        rpid = waitpid(pid, &status, 0);
    } while (rpid == -1 && errno == EINTR);
    if (rpid == pid && WIFEXITED(status) && !WEXITSTATUS(status)) {
        return;
    }

exit_err:
    error_set(err, QERR_UNDEFINED_ERROR);
}

void qmp_guest_suspend_disk(Error **err)
{
    bios_supports_mode("pm-is-supported", "--hibernate", "disk", err);
    if (error_is_set(err)) {
        return;
    }

    guest_suspend("pm-hibernate", "disk", err);
}

void qmp_guest_suspend_ram(Error **err)
{
    bios_supports_mode("pm-is-supported", "--suspend", "mem", err);
    if (error_is_set(err)) {
        return;
    }

    guest_suspend("pm-suspend", "mem", err);
}

void qmp_guest_suspend_hybrid(Error **err)
{
    bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, err);
    if (error_is_set(err)) {
        return;
    }

    guest_suspend("pm-suspend-hybrid", NULL, err);
}

static GuestNetworkInterfaceList *
guest_find_interface(GuestNetworkInterfaceList *head,
                     const char *name)
{
    for (; head; head = head->next) {
        if (strcmp(head->value->name, name) == 0) {
            break;
        }
    }

    return head;
}

/*
 * Build information about guest interfaces
 */
GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
{
    GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
    struct ifaddrs *ifap, *ifa;
    char err_msg[512];

    if (getifaddrs(&ifap) < 0) {
        snprintf(err_msg, sizeof(err_msg),
                 "getifaddrs failed: %s", strerror(errno));
        error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
        goto error;
    }

    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
        GuestNetworkInterfaceList *info;
        GuestIpAddressList **address_list = NULL, *address_item = NULL;
        char addr4[INET_ADDRSTRLEN];
        char addr6[INET6_ADDRSTRLEN];
        int sock;
        struct ifreq ifr;
        unsigned char *mac_addr;
        void *p;

        g_debug("Processing %s interface", ifa->ifa_name);

        info = guest_find_interface(head, ifa->ifa_name);

        if (!info) {
            info = g_malloc0(sizeof(*info));
            info->value = g_malloc0(sizeof(*info->value));
            info->value->name = g_strdup(ifa->ifa_name);

            if (!cur_item) {
                head = cur_item = info;
            } else {
                cur_item->next = info;
                cur_item = info;
            }
        }

        if (!info->value->has_hardware_address &&
            ifa->ifa_flags & SIOCGIFHWADDR) {
            /* we haven't obtained HW address yet */
            sock = socket(PF_INET, SOCK_STREAM, 0);
            if (sock == -1) {
                snprintf(err_msg, sizeof(err_msg),
                         "failed to create socket: %s", strerror(errno));
                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
                goto error;
            }

            memset(&ifr, 0, sizeof(ifr));
            strncpy(ifr.ifr_name,  info->value->name, IF_NAMESIZE);
            if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
                snprintf(err_msg, sizeof(err_msg),
                         "failed to get MAC address of %s: %s",
                         ifa->ifa_name,
                         strerror(errno));
                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
                goto error;
            }

            mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;

            if (asprintf(&info->value->hardware_address,
                         "%02x:%02x:%02x:%02x:%02x:%02x",
                         (int) mac_addr[0], (int) mac_addr[1],
                         (int) mac_addr[2], (int) mac_addr[3],
                         (int) mac_addr[4], (int) mac_addr[5]) == -1) {
                snprintf(err_msg, sizeof(err_msg),
                         "failed to format MAC: %s", strerror(errno));
                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
                goto error;
            }

            info->value->has_hardware_address = true;
            close(sock);
        }

        if (ifa->ifa_addr &&
            ifa->ifa_addr->sa_family == AF_INET) {
            /* interface with IPv4 address */
            address_item = g_malloc0(sizeof(*address_item));
            address_item->value = g_malloc0(sizeof(*address_item->value));
            p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
            if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
                snprintf(err_msg, sizeof(err_msg),
                         "inet_ntop failed : %s", strerror(errno));
                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
                goto error;
            }

            address_item->value->ip_address = g_strdup(addr4);
            address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;

            if (ifa->ifa_netmask) {
                /* Count the number of set bits in netmask.
                 * This is safe as '1' and '0' cannot be shuffled in netmask. */
                p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
                address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
            }
        } else if (ifa->ifa_addr &&
                   ifa->ifa_addr->sa_family == AF_INET6) {
            /* interface with IPv6 address */
            address_item = g_malloc0(sizeof(*address_item));
            address_item->value = g_malloc0(sizeof(*address_item->value));
            p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
            if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
                snprintf(err_msg, sizeof(err_msg),
                         "inet_ntop failed : %s", strerror(errno));
                error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
                goto error;
            }

            address_item->value->ip_address = g_strdup(addr6);
            address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;

            if (ifa->ifa_netmask) {
                /* Count the number of set bits in netmask.
                 * This is safe as '1' and '0' cannot be shuffled in netmask. */
                p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
                address_item->value->prefix =
                    ctpop32(((uint32_t *) p)[0]) +
                    ctpop32(((uint32_t *) p)[1]) +
                    ctpop32(((uint32_t *) p)[2]) +
                    ctpop32(((uint32_t *) p)[3]);
            }
        }

        if (!address_item) {
            continue;
        }

        address_list = &info->value->ip_addresses;

        while (*address_list && (*address_list)->next) {
            address_list = &(*address_list)->next;
        }

        if (!*address_list) {
            *address_list = address_item;
        } else {
            (*address_list)->next = address_item;
        }

        info->value->has_ip_addresses = true;


    }

    freeifaddrs(ifap);
    return head;

error:
    freeifaddrs(ifap);
    qapi_free_GuestNetworkInterfaceList(head);
    return NULL;
}

#else /* defined(__linux__) */

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

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

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

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

#endif

#if !defined(CONFIG_FSFREEZE)

GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
{
    error_set(err, QERR_UNSUPPORTED);

    return 0;
}

int64_t qmp_guest_fsfreeze_freeze(Error **err)
{
    error_set(err, QERR_UNSUPPORTED);

    return 0;
}

int64_t qmp_guest_fsfreeze_thaw(Error **err)
{
    error_set(err, QERR_UNSUPPORTED);

    return 0;
}

#endif

/* register init/cleanup routines for stateful command groups */
void ga_command_state_init(GAState *s, GACommandState *cs)
{
#if defined(CONFIG_FSFREEZE)
    ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
#endif
    ga_command_state_add(cs, guest_file_init, NULL);
}