qga/commands-posix.c

   1 /*
   2  * QEMU Guest Agent POSIX-specific command implementations
   3  *
   4  * Copyright IBM Corp. 2011
   5  *
   6  * Authors:
   7  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
   8  *  Michal Privoznik  <mprivozn@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13
  14 #include <glib.h>
  15 #include <sys/types.h>
  16 #include <sys/ioctl.h>
  17 #include "qga/guest-agent-core.h"
  18 #include "qga-qmp-commands.h"
  19 #include "qerror.h"
  20 #include "qemu-queue.h"
  21 #include "host-utils.h"
  22
  23 #if defined(__linux__)
  24 #include <mntent.h>
  25 #include <linux/fs.h>
  26 #include <ifaddrs.h>
  27 #include <arpa/inet.h>
  28 #include <sys/socket.h>
  29 #include <net/if.h>
  30 #include <sys/wait.h>
  31
  32 #if defined(__linux__) && defined(FIFREEZE)
  33 #define CONFIG_FSFREEZE
  34 #endif
  35 #endif
  36
  37 #if defined(__linux__)
  38 /* TODO: use this in place of all post-fork() fclose(std*) callers */
  39 static void reopen_fd_to_null(int fd)
  40 {
  41     int nullfd;
  42
  43     nullfd = open("/dev/null", O_RDWR);
  44     if (nullfd < 0) {
  45         return;
  46     }
  47
  48     dup2(nullfd, fd);
  49
  50     if (nullfd != fd) {
  51         close(nullfd);
  52     }
  53 }
  54 #endif /* defined(__linux__) */
  55
  56 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
  57 {
  58     int ret;
  59     const char *shutdown_flag;
  60
  61     slog("guest-shutdown called, mode: %s", mode);
  62     if (!has_mode || strcmp(mode, "powerdown") == 0) {
  63         shutdown_flag = "-P";
  64     } else if (strcmp(mode, "halt") == 0) {
  65         shutdown_flag = "-H";
  66     } else if (strcmp(mode, "reboot") == 0) {
  67         shutdown_flag = "-r";
  68     } else {
  69         error_set(err, QERR_INVALID_PARAMETER_VALUE, "mode",
  70                   "halt|powerdown|reboot");
  71         return;
  72     }
  73
  74     ret = fork();
  75     if (ret == 0) {
  76         /* child, start the shutdown */
  77         setsid();
  78         fclose(stdin);
  79         fclose(stdout);
  80         fclose(stderr);
  81
  82         ret = execl("/sbin/shutdown", "shutdown", shutdown_flag, "+0",
  83                     "hypervisor initiated shutdown", (char*)NULL);
  84         if (ret) {
  85             slog("guest-shutdown failed: %s", strerror(errno));
  86         }
  87         exit(!!ret);
  88     } else if (ret < 0) {
  89         error_set(err, QERR_UNDEFINED_ERROR);
  90     }
  91 }
  92
  93 typedef struct GuestFileHandle {
  94     uint64_t id;
  95     FILE *fh;
  96     QTAILQ_ENTRY(GuestFileHandle) next;
  97 } GuestFileHandle;
  98
  99 static struct {
 100     QTAILQ_HEAD(, GuestFileHandle) filehandles;
 101 } guest_file_state;
 102
 103 static void guest_file_handle_add(FILE *fh)
 104 {
 105     GuestFileHandle *gfh;
 106
 107     gfh = g_malloc0(sizeof(GuestFileHandle));
 108     gfh->id = fileno(fh);
 109     gfh->fh = fh;
 110     QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
 111 }
 112
 113 static GuestFileHandle *guest_file_handle_find(int64_t id)
 114 {
 115     GuestFileHandle *gfh;
 116
 117     QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
 118     {
 119         if (gfh->id == id) {
 120             return gfh;
 121         }
 122     }
 123
 124     return NULL;
 125 }
 126
 127 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
 128 {
 129     FILE *fh;
 130     int fd;
 131     int64_t ret = -1;
 132
 133     if (!has_mode) {
 134         mode = "r";
 135     }
 136     slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
 137     fh = fopen(path, mode);
 138     if (!fh) {
 139         error_set(err, QERR_OPEN_FILE_FAILED, path);
 140         return -1;
 141     }
 142
 143     /* set fd non-blocking to avoid common use cases (like reading from a
 144      * named pipe) from hanging the agent
 145      */
 146     fd = fileno(fh);
 147     ret = fcntl(fd, F_GETFL);
 148     ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);
 149     if (ret == -1) {
 150         error_set(err, QERR_QGA_COMMAND_FAILED, "fcntl() failed");
 151         fclose(fh);
 152         return -1;
 153     }
 154
 155     guest_file_handle_add(fh);
 156     slog("guest-file-open, handle: %d", fd);
 157     return fd;
 158 }
 159
 160 void qmp_guest_file_close(int64_t handle, Error **err)
 161 {
 162     GuestFileHandle *gfh = guest_file_handle_find(handle);
 163     int ret;
 164
 165     slog("guest-file-close called, handle: %ld", handle);
 166     if (!gfh) {
 167         error_set(err, QERR_FD_NOT_FOUND, "handle");
 168         return;
 169     }
 170
 171     ret = fclose(gfh->fh);
 172     if (ret == -1) {
 173         error_set(err, QERR_QGA_COMMAND_FAILED, "fclose() failed");
 174         return;
 175     }
 176
 177     QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
 178     g_free(gfh);
 179 }
 180
 181 struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
 182                                           int64_t count, Error **err)
 183 {
 184     GuestFileHandle *gfh = guest_file_handle_find(handle);
 185     GuestFileRead *read_data = NULL;
 186     guchar *buf;
 187     FILE *fh;
 188     size_t read_count;
 189
 190     if (!gfh) {
 191         error_set(err, QERR_FD_NOT_FOUND, "handle");
 192         return NULL;
 193     }
 194
 195     if (!has_count) {
 196         count = QGA_READ_COUNT_DEFAULT;
 197     } else if (count < 0) {
 198         error_set(err, QERR_INVALID_PARAMETER, "count");
 199         return NULL;
 200     }
 201
 202     fh = gfh->fh;
 203     buf = g_malloc0(count+1);
 204     read_count = fread(buf, 1, count, fh);
 205     if (ferror(fh)) {
 206         slog("guest-file-read failed, handle: %ld", handle);
 207         error_set(err, QERR_QGA_COMMAND_FAILED, "fread() failed");
 208     } else {
 209         buf[read_count] = 0;
 210         read_data = g_malloc0(sizeof(GuestFileRead));
 211         read_data->count = read_count;
 212         read_data->eof = feof(fh);
 213         if (read_count) {
 214             read_data->buf_b64 = g_base64_encode(buf, read_count);
 215         }
 216     }
 217     g_free(buf);
 218     clearerr(fh);
 219
 220     return read_data;
 221 }
 222
 223 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
 224                                      bool has_count, int64_t count, Error **err)
 225 {
 226     GuestFileWrite *write_data = NULL;
 227     guchar *buf;
 228     gsize buf_len;
 229     int write_count;
 230     GuestFileHandle *gfh = guest_file_handle_find(handle);
 231     FILE *fh;
 232
 233     if (!gfh) {
 234         error_set(err, QERR_FD_NOT_FOUND, "handle");
 235         return NULL;
 236     }
 237
 238     fh = gfh->fh;
 239     buf = g_base64_decode(buf_b64, &buf_len);
 240
 241     if (!has_count) {
 242         count = buf_len;
 243     } else if (count < 0 || count > buf_len) {
 244         g_free(buf);
 245         error_set(err, QERR_INVALID_PARAMETER, "count");
 246         return NULL;
 247     }
 248
 249     write_count = fwrite(buf, 1, count, fh);
 250     if (ferror(fh)) {
 251         slog("guest-file-write failed, handle: %ld", handle);
 252         error_set(err, QERR_QGA_COMMAND_FAILED, "fwrite() error");
 253     } else {
 254         write_data = g_malloc0(sizeof(GuestFileWrite));
 255         write_data->count = write_count;
 256         write_data->eof = feof(fh);
 257     }
 258     g_free(buf);
 259     clearerr(fh);
 260
 261     return write_data;
 262 }
 263
 264 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
 265                                           int64_t whence, Error **err)
 266 {
 267     GuestFileHandle *gfh = guest_file_handle_find(handle);
 268     GuestFileSeek *seek_data = NULL;
 269     FILE *fh;
 270     int ret;
 271
 272     if (!gfh) {
 273         error_set(err, QERR_FD_NOT_FOUND, "handle");
 274         return NULL;
 275     }
 276
 277     fh = gfh->fh;
 278     ret = fseek(fh, offset, whence);
 279     if (ret == -1) {
 280         error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));
 281     } else {
 282         seek_data = g_malloc0(sizeof(GuestFileRead));
 283         seek_data->position = ftell(fh);
 284         seek_data->eof = feof(fh);
 285     }
 286     clearerr(fh);
 287
 288     return seek_data;
 289 }
 290
 291 void qmp_guest_file_flush(int64_t handle, Error **err)
 292 {
 293     GuestFileHandle *gfh = guest_file_handle_find(handle);
 294     FILE *fh;
 295     int ret;
 296
 297     if (!gfh) {
 298         error_set(err, QERR_FD_NOT_FOUND, "handle");
 299         return;
 300     }
 301
 302     fh = gfh->fh;
 303     ret = fflush(fh);
 304     if (ret == EOF) {
 305         error_set(err, QERR_QGA_COMMAND_FAILED, strerror(errno));
 306     }
 307 }
 308
 309 static void guest_file_init(void)
 310 {
 311     QTAILQ_INIT(&guest_file_state.filehandles);
 312 }
 313
 314 /* linux-specific implementations. avoid this if at all possible. */
 315 #if defined(__linux__)
 316
 317 #if defined(CONFIG_FSFREEZE)
 318
 319 typedef struct GuestFsfreezeMount {
 320     char *dirname;
 321     char *devtype;
 322     QTAILQ_ENTRY(GuestFsfreezeMount) next;
 323 } GuestFsfreezeMount;
 324
 325 typedef QTAILQ_HEAD(, GuestFsfreezeMount) GuestFsfreezeMountList;
 326
 327 static void guest_fsfreeze_free_mount_list(GuestFsfreezeMountList *mounts)
 328 {
 329      GuestFsfreezeMount *mount, *temp;
 330
 331      if (!mounts) {
 332          return;
 333      }
 334
 335      QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
 336          QTAILQ_REMOVE(mounts, mount, next);
 337          g_free(mount->dirname);
 338          g_free(mount->devtype);
 339          g_free(mount);
 340      }
 341 }
 342
 343 /*
 344  * Walk the mount table and build a list of local file systems
 345  */
 346 static int guest_fsfreeze_build_mount_list(GuestFsfreezeMountList *mounts)
 347 {
 348     struct mntent *ment;
 349     GuestFsfreezeMount *mount;
 350     char const *mtab = MOUNTED;
 351     FILE *fp;
 352
 353     fp = setmntent(mtab, "r");
 354     if (!fp) {
 355         g_warning("fsfreeze: unable to read mtab");
 356         return -1;
 357     }
 358
 359     while ((ment = getmntent(fp))) {
 360         /*
 361          * An entry which device name doesn't start with a '/' is
 362          * either a dummy file system or a network file system.
 363          * Add special handling for smbfs and cifs as is done by
 364          * coreutils as well.
 365          */
 366         if ((ment->mnt_fsname[0] != '/') ||
 367             (strcmp(ment->mnt_type, "smbfs") == 0) ||
 368             (strcmp(ment->mnt_type, "cifs") == 0)) {
 369             continue;
 370         }
 371
 372         mount = g_malloc0(sizeof(GuestFsfreezeMount));
 373         mount->dirname = g_strdup(ment->mnt_dir);
 374         mount->devtype = g_strdup(ment->mnt_type);
 375
 376         QTAILQ_INSERT_TAIL(mounts, mount, next);
 377     }
 378
 379     endmntent(fp);
 380
 381     return 0;
 382 }
 383
 384 /*
 385  * Return status of freeze/thaw
 386  */
 387 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
 388 {
 389     if (ga_is_frozen(ga_state)) {
 390         return GUEST_FSFREEZE_STATUS_FROZEN;
 391     }
 392
 393     return GUEST_FSFREEZE_STATUS_THAWED;
 394 }
 395
 396 /*
 397  * Walk list of mounted file systems in the guest, and freeze the ones which
 398  * are real local file systems.
 399  */
 400 int64_t qmp_guest_fsfreeze_freeze(Error **err)
 401 {
 402     int ret = 0, i = 0;
 403     GuestFsfreezeMountList mounts;
 404     struct GuestFsfreezeMount *mount;
 405     int fd;
 406     char err_msg[512];
 407
 408     slog("guest-fsfreeze called");
 409
 410     QTAILQ_INIT(&mounts);
 411     ret = guest_fsfreeze_build_mount_list(&mounts);
 412     if (ret < 0) {
 413         return ret;
 414     }
 415
 416     /* cannot risk guest agent blocking itself on a write in this state */
 417     ga_set_frozen(ga_state);
 418
 419     QTAILQ_FOREACH(mount, &mounts, next) {
 420         fd = qemu_open(mount->dirname, O_RDONLY);
 421         if (fd == -1) {
 422             sprintf(err_msg, "failed to open %s, %s", mount->dirname,
 423                     strerror(errno));
 424             error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
 425             goto error;
 426         }
 427
 428         /* we try to cull filesytems we know won't work in advance, but other
 429          * filesytems may not implement fsfreeze for less obvious reasons.
 430          * these will report EOPNOTSUPP. we simply ignore these when tallying
 431          * the number of frozen filesystems.
 432          *
 433          * any other error means a failure to freeze a filesystem we
 434          * expect to be freezable, so return an error in those cases
 435          * and return system to thawed state.
 436          */
 437         ret = ioctl(fd, FIFREEZE);
 438         if (ret == -1) {
 439             if (errno != EOPNOTSUPP) {
 440                 sprintf(err_msg, "failed to freeze %s, %s",
 441                         mount->dirname, strerror(errno));
 442                 error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
 443                 close(fd);
 444                 goto error;
 445             }
 446         } else {
 447             i++;
 448         }
 449         close(fd);
 450     }
 451
 452     guest_fsfreeze_free_mount_list(&mounts);
 453     return i;
 454
 455 error:
 456     guest_fsfreeze_free_mount_list(&mounts);
 457     qmp_guest_fsfreeze_thaw(NULL);
 458     return 0;
 459 }
 460
 461 /*
 462  * Walk list of frozen file systems in the guest, and thaw them.
 463  */
 464 int64_t qmp_guest_fsfreeze_thaw(Error **err)
 465 {
 466     int ret;
 467     GuestFsfreezeMountList mounts;
 468     GuestFsfreezeMount *mount;
 469     int fd, i = 0, logged;
 470
 471     QTAILQ_INIT(&mounts);
 472     ret = guest_fsfreeze_build_mount_list(&mounts);
 473     if (ret) {
 474         error_set(err, QERR_QGA_COMMAND_FAILED,
 475                   "failed to enumerate filesystems");
 476         return 0;
 477     }
 478
 479     QTAILQ_FOREACH(mount, &mounts, next) {
 480         logged = false;
 481         fd = qemu_open(mount->dirname, O_RDONLY);
 482         if (fd == -1) {
 483             continue;
 484         }
 485         /* we have no way of knowing whether a filesystem was actually unfrozen
 486          * as a result of a successful call to FITHAW, only that if an error
 487          * was returned the filesystem was *not* unfrozen by that particular
 488          * call.
 489          *
 490          * since multiple preceding FIFREEZEs require multiple calls to FITHAW
 491          * to unfreeze, continuing issuing FITHAW until an error is returned,
 492          * in which case either the filesystem is in an unfreezable state, or,
 493          * more likely, it was thawed previously (and remains so afterward).
 494          *
 495          * also, since the most recent successful call is the one that did
 496          * the actual unfreeze, we can use this to provide an accurate count
 497          * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
 498          * may * be useful for determining whether a filesystem was unfrozen
 499          * during the freeze/thaw phase by a process other than qemu-ga.
 500          */
 501         do {
 502             ret = ioctl(fd, FITHAW);
 503             if (ret == 0 && !logged) {
 504                 i++;
 505                 logged = true;
 506             }
 507         } while (ret == 0);
 508         close(fd);
 509     }
 510
 511     ga_unset_frozen(ga_state);
 512     guest_fsfreeze_free_mount_list(&mounts);
 513     return i;
 514 }
 515
 516 static void guest_fsfreeze_cleanup(void)
 517 {
 518     int64_t ret;
 519     Error *err = NULL;
 520
 521     if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
 522         ret = qmp_guest_fsfreeze_thaw(&err);
 523         if (ret < 0 || err) {
 524             slog("failed to clean up frozen filesystems");
 525         }
 526     }
 527 }
 528 #endif /* CONFIG_FSFREEZE */
 529
 530 #define LINUX_SYS_STATE_FILE "/sys/power/state"
 531 #define SUSPEND_SUPPORTED 0
 532 #define SUSPEND_NOT_SUPPORTED 1
 533
 534 /**
 535  * This function forks twice and the information about the mode support
 536  * status is passed to the qemu-ga process via a pipe.
 537  *
 538  * This approach allows us to keep the way we reap terminated children
 539  * in qemu-ga quite simple.
 540  */
 541 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
 542                                const char *sysfile_str, Error **err)
 543 {
 544     pid_t pid;
 545     ssize_t ret;
 546     char *pmutils_path;
 547     int status, pipefds[2];
 548
 549     if (pipe(pipefds) < 0) {
 550         error_set(err, QERR_UNDEFINED_ERROR);
 551         return;
 552     }
 553
 554     pmutils_path = g_find_program_in_path(pmutils_bin);
 555
 556     pid = fork();
 557     if (!pid) {
 558         struct sigaction act;
 559
 560         memset(&act, 0, sizeof(act));
 561         act.sa_handler = SIG_DFL;
 562         sigaction(SIGCHLD, &act, NULL);
 563
 564         setsid();
 565         close(pipefds[0]);
 566         reopen_fd_to_null(0);
 567         reopen_fd_to_null(1);
 568         reopen_fd_to_null(2);
 569
 570         pid = fork();
 571         if (!pid) {
 572             int fd;
 573             char buf[32]; /* hopefully big enough */
 574
 575             if (pmutils_path) {
 576                 execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
 577             }
 578
 579             /*
 580              * If we get here either pm-utils is not installed or execle() has
 581              * failed. Let's try the manual method if the caller wants it.
 582              */
 583
 584             if (!sysfile_str) {
 585                 _exit(SUSPEND_NOT_SUPPORTED);
 586             }
 587
 588             fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
 589             if (fd < 0) {
 590                 _exit(SUSPEND_NOT_SUPPORTED);
 591             }
 592
 593             ret = read(fd, buf, sizeof(buf)-1);
 594             if (ret <= 0) {
 595                 _exit(SUSPEND_NOT_SUPPORTED);
 596             }
 597             buf[ret] = '\0';
 598
 599             if (strstr(buf, sysfile_str)) {
 600                 _exit(SUSPEND_SUPPORTED);
 601             }
 602
 603             _exit(SUSPEND_NOT_SUPPORTED);
 604         }
 605
 606         if (pid > 0) {
 607             wait(&status);
 608         } else {
 609             status = SUSPEND_NOT_SUPPORTED;
 610         }
 611
 612         ret = write(pipefds[1], &status, sizeof(status));
 613         if (ret != sizeof(status)) {
 614             _exit(EXIT_FAILURE);
 615         }
 616
 617         _exit(EXIT_SUCCESS);
 618     }
 619
 620     close(pipefds[1]);
 621     g_free(pmutils_path);
 622
 623     if (pid < 0) {
 624         error_set(err, QERR_UNDEFINED_ERROR);
 625         goto out;
 626     }
 627
 628     ret = read(pipefds[0], &status, sizeof(status));
 629     if (ret == sizeof(status) && WIFEXITED(status) &&
 630         WEXITSTATUS(status) == SUSPEND_SUPPORTED) {
 631             goto out;
 632     }
 633
 634     error_set(err, QERR_UNSUPPORTED);
 635
 636 out:
 637     close(pipefds[0]);
 638 }
 639
 640 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
 641                           Error **err)
 642 {
 643     pid_t pid;
 644     char *pmutils_path;
 645
 646     pmutils_path = g_find_program_in_path(pmutils_bin);
 647
 648     pid = fork();
 649     if (pid == 0) {
 650         /* child */
 651         int fd;
 652
 653         setsid();
 654         reopen_fd_to_null(0);
 655         reopen_fd_to_null(1);
 656         reopen_fd_to_null(2);
 657
 658         if (pmutils_path) {
 659             execle(pmutils_path, pmutils_bin, NULL, environ);
 660         }
 661
 662         /*
 663          * If we get here either pm-utils is not installed or execle() has
 664          * failed. Let's try the manual method if the caller wants it.
 665          */
 666
 667         if (!sysfile_str) {
 668             _exit(EXIT_FAILURE);
 669         }
 670
 671         fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
 672         if (fd < 0) {
 673             _exit(EXIT_FAILURE);
 674         }
 675
 676         if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
 677             _exit(EXIT_FAILURE);
 678         }
 679
 680         _exit(EXIT_SUCCESS);
 681     }
 682
 683     g_free(pmutils_path);
 684
 685     if (pid < 0) {
 686         error_set(err, QERR_UNDEFINED_ERROR);
 687         return;
 688     }
 689 }
 690
 691 void qmp_guest_suspend_disk(Error **err)
 692 {
 693     bios_supports_mode("pm-is-supported", "--hibernate", "disk", err);
 694     if (error_is_set(err)) {
 695         return;
 696     }
 697
 698     guest_suspend("pm-hibernate", "disk", err);
 699 }
 700
 701 void qmp_guest_suspend_ram(Error **err)
 702 {
 703     bios_supports_mode("pm-is-supported", "--suspend", "mem", err);
 704     if (error_is_set(err)) {
 705         return;
 706     }
 707
 708     guest_suspend("pm-suspend", "mem", err);
 709 }
 710
 711 void qmp_guest_suspend_hybrid(Error **err)
 712 {
 713     bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, err);
 714     if (error_is_set(err)) {
 715         return;
 716     }
 717
 718     guest_suspend("pm-suspend-hybrid", NULL, err);
 719 }
 720
 721 static GuestNetworkInterfaceList *
 722 guest_find_interface(GuestNetworkInterfaceList *head,
 723                      const char *name)
 724 {
 725     for (; head; head = head->next) {
 726         if (strcmp(head->value->name, name) == 0) {
 727             break;
 728         }
 729     }
 730
 731     return head;
 732 }
 733
 734 /*
 735  * Build information about guest interfaces
 736  */
 737 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
 738 {
 739     GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
 740     struct ifaddrs *ifap, *ifa;
 741     char err_msg[512];
 742
 743     if (getifaddrs(&ifap) < 0) {
 744         snprintf(err_msg, sizeof(err_msg),
 745                  "getifaddrs failed: %s", strerror(errno));
 746         error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 747         goto error;
 748     }
 749
 750     for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 751         GuestNetworkInterfaceList *info;
 752         GuestIpAddressList **address_list = NULL, *address_item = NULL;
 753         char addr4[INET_ADDRSTRLEN];
 754         char addr6[INET6_ADDRSTRLEN];
 755         int sock;
 756         struct ifreq ifr;
 757         unsigned char *mac_addr;
 758         void *p;
 759
 760         g_debug("Processing %s interface", ifa->ifa_name);
 761
 762         info = guest_find_interface(head, ifa->ifa_name);
 763
 764         if (!info) {
 765             info = g_malloc0(sizeof(*info));
 766             info->value = g_malloc0(sizeof(*info->value));
 767             info->value->name = g_strdup(ifa->ifa_name);
 768
 769             if (!cur_item) {
 770                 head = cur_item = info;
 771             } else {
 772                 cur_item->next = info;
 773                 cur_item = info;
 774             }
 775         }
 776
 777         if (!info->value->has_hardware_address &&
 778             ifa->ifa_flags & SIOCGIFHWADDR) {
 779             /* we haven't obtained HW address yet */
 780             sock = socket(PF_INET, SOCK_STREAM, 0);
 781             if (sock == -1) {
 782                 snprintf(err_msg, sizeof(err_msg),
 783                          "failed to create socket: %s", strerror(errno));
 784                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 785                 goto error;
 786             }
 787
 788             memset(&ifr, 0, sizeof(ifr));
 789             strncpy(ifr.ifr_name,  info->value->name, IF_NAMESIZE);
 790             if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
 791                 snprintf(err_msg, sizeof(err_msg),
 792                          "failed to get MAC address of %s: %s",
 793                          ifa->ifa_name,
 794                          strerror(errno));
 795                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 796                 goto error;
 797             }
 798
 799             mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
 800
 801             if (asprintf(&info->value->hardware_address,
 802                          "%02x:%02x:%02x:%02x:%02x:%02x",
 803                          (int) mac_addr[0], (int) mac_addr[1],
 804                          (int) mac_addr[2], (int) mac_addr[3],
 805                          (int) mac_addr[4], (int) mac_addr[5]) == -1) {
 806                 snprintf(err_msg, sizeof(err_msg),
 807                          "failed to format MAC: %s", strerror(errno));
 808                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 809                 goto error;
 810             }
 811
 812             info->value->has_hardware_address = true;
 813             close(sock);
 814         }
 815
 816         if (ifa->ifa_addr &&
 817             ifa->ifa_addr->sa_family == AF_INET) {
 818             /* interface with IPv4 address */
 819             address_item = g_malloc0(sizeof(*address_item));
 820             address_item->value = g_malloc0(sizeof(*address_item->value));
 821             p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
 822             if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
 823                 snprintf(err_msg, sizeof(err_msg),
 824                          "inet_ntop failed : %s", strerror(errno));
 825                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 826                 goto error;
 827             }
 828
 829             address_item->value->ip_address = g_strdup(addr4);
 830             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
 831
 832             if (ifa->ifa_netmask) {
 833                 /* Count the number of set bits in netmask.
 834                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
 835                 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
 836                 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
 837             }
 838         } else if (ifa->ifa_addr &&
 839                    ifa->ifa_addr->sa_family == AF_INET6) {
 840             /* interface with IPv6 address */
 841             address_item = g_malloc0(sizeof(*address_item));
 842             address_item->value = g_malloc0(sizeof(*address_item->value));
 843             p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
 844             if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
 845                 snprintf(err_msg, sizeof(err_msg),
 846                          "inet_ntop failed : %s", strerror(errno));
 847                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 848                 goto error;
 849             }
 850
 851             address_item->value->ip_address = g_strdup(addr6);
 852             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
 853
 854             if (ifa->ifa_netmask) {
 855                 /* Count the number of set bits in netmask.
 856                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
 857                 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
 858                 address_item->value->prefix =
 859                     ctpop32(((uint32_t *) p)[0]) +
 860                     ctpop32(((uint32_t *) p)[1]) +
 861                     ctpop32(((uint32_t *) p)[2]) +
 862                     ctpop32(((uint32_t *) p)[3]);
 863             }
 864         }
 865
 866         if (!address_item) {
 867             continue;
 868         }
 869
 870         address_list = &info->value->ip_addresses;
 871
 872         while (*address_list && (*address_list)->next) {
 873             address_list = &(*address_list)->next;
 874         }
 875
 876         if (!*address_list) {
 877             *address_list = address_item;
 878         } else {
 879             (*address_list)->next = address_item;
 880         }
 881
 882         info->value->has_ip_addresses = true;
 883
 884
 885     }
 886
 887     freeifaddrs(ifap);
 888     return head;
 889
 890 error:
 891     freeifaddrs(ifap);
 892     qapi_free_GuestNetworkInterfaceList(head);
 893     return NULL;
 894 }
 895
 896 #else /* defined(__linux__) */
 897
 898 void qmp_guest_suspend_disk(Error **err)
 899 {
 900     error_set(err, QERR_UNSUPPORTED);
 901 }
 902
 903 void qmp_guest_suspend_ram(Error **err)
 904 {
 905     error_set(err, QERR_UNSUPPORTED);
 906 }
 907
 908 void qmp_guest_suspend_hybrid(Error **err)
 909 {
 910     error_set(err, QERR_UNSUPPORTED);
 911 }
 912
 913 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
 914 {
 915     error_set(errp, QERR_UNSUPPORTED);
 916     return NULL;
 917 }
 918
 919 #endif
 920
 921 #if !defined(CONFIG_FSFREEZE)
 922
 923 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
 924 {
 925     error_set(err, QERR_UNSUPPORTED);
 926
 927     return 0;
 928 }
 929
 930 int64_t qmp_guest_fsfreeze_freeze(Error **err)
 931 {
 932     error_set(err, QERR_UNSUPPORTED);
 933
 934     return 0;
 935 }
 936
 937 int64_t qmp_guest_fsfreeze_thaw(Error **err)
 938 {
 939     error_set(err, QERR_UNSUPPORTED);
 940
 941     return 0;
 942 }
 943
 944 #endif
 945
 946 /* register init/cleanup routines for stateful command groups */
 947 void ga_command_state_init(GAState *s, GACommandState *cs)
 948 {
 949 #if defined(CONFIG_FSFREEZE)
 950     ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
 951 #endif
 952     ga_command_state_add(cs, guest_file_init, NULL);
 953 }