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