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 static void disable_logging(void)
 320 {
 321     ga_disable_logging(ga_state);
 322 }
 323
 324 static void enable_logging(void)
 325 {
 326     ga_enable_logging(ga_state);
 327 }
 328
 329 typedef struct GuestFsfreezeMount {
 330     char *dirname;
 331     char *devtype;
 332     QTAILQ_ENTRY(GuestFsfreezeMount) next;
 333 } GuestFsfreezeMount;
 334
 335 typedef QTAILQ_HEAD(, GuestFsfreezeMount) GuestFsfreezeMountList;
 336
 337 struct {
 338     GuestFsfreezeStatus status;
 339 } guest_fsfreeze_state;
 340
 341 static void guest_fsfreeze_free_mount_list(GuestFsfreezeMountList *mounts)
 342 {
 343      GuestFsfreezeMount *mount, *temp;
 344
 345      if (!mounts) {
 346          return;
 347      }
 348
 349      QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
 350          QTAILQ_REMOVE(mounts, mount, next);
 351          g_free(mount->dirname);
 352          g_free(mount->devtype);
 353          g_free(mount);
 354      }
 355 }
 356
 357 /*
 358  * Walk the mount table and build a list of local file systems
 359  */
 360 static int guest_fsfreeze_build_mount_list(GuestFsfreezeMountList *mounts)
 361 {
 362     struct mntent *ment;
 363     GuestFsfreezeMount *mount;
 364     char const *mtab = MOUNTED;
 365     FILE *fp;
 366
 367     fp = setmntent(mtab, "r");
 368     if (!fp) {
 369         g_warning("fsfreeze: unable to read mtab");
 370         return -1;
 371     }
 372
 373     while ((ment = getmntent(fp))) {
 374         /*
 375          * An entry which device name doesn't start with a '/' is
 376          * either a dummy file system or a network file system.
 377          * Add special handling for smbfs and cifs as is done by
 378          * coreutils as well.
 379          */
 380         if ((ment->mnt_fsname[0] != '/') ||
 381             (strcmp(ment->mnt_type, "smbfs") == 0) ||
 382             (strcmp(ment->mnt_type, "cifs") == 0)) {
 383             continue;
 384         }
 385
 386         mount = g_malloc0(sizeof(GuestFsfreezeMount));
 387         mount->dirname = g_strdup(ment->mnt_dir);
 388         mount->devtype = g_strdup(ment->mnt_type);
 389
 390         QTAILQ_INSERT_TAIL(mounts, mount, next);
 391     }
 392
 393     endmntent(fp);
 394
 395     return 0;
 396 }
 397
 398 /*
 399  * Return status of freeze/thaw
 400  */
 401 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
 402 {
 403     return guest_fsfreeze_state.status;
 404 }
 405
 406 /*
 407  * Walk list of mounted file systems in the guest, and freeze the ones which
 408  * are real local file systems.
 409  */
 410 int64_t qmp_guest_fsfreeze_freeze(Error **err)
 411 {
 412     int ret = 0, i = 0;
 413     GuestFsfreezeMountList mounts;
 414     struct GuestFsfreezeMount *mount;
 415     int fd;
 416     char err_msg[512];
 417
 418     slog("guest-fsfreeze called");
 419
 420     QTAILQ_INIT(&mounts);
 421     ret = guest_fsfreeze_build_mount_list(&mounts);
 422     if (ret < 0) {
 423         return ret;
 424     }
 425
 426     /* cannot risk guest agent blocking itself on a write in this state */
 427     disable_logging();
 428
 429     QTAILQ_FOREACH(mount, &mounts, next) {
 430         fd = qemu_open(mount->dirname, O_RDONLY);
 431         if (fd == -1) {
 432             sprintf(err_msg, "failed to open %s, %s", mount->dirname,
 433                     strerror(errno));
 434             error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
 435             goto error;
 436         }
 437
 438         /* we try to cull filesytems we know won't work in advance, but other
 439          * filesytems may not implement fsfreeze for less obvious reasons.
 440          * these will report EOPNOTSUPP. we simply ignore these when tallying
 441          * the number of frozen filesystems.
 442          *
 443          * any other error means a failure to freeze a filesystem we
 444          * expect to be freezable, so return an error in those cases
 445          * and return system to thawed state.
 446          */
 447         ret = ioctl(fd, FIFREEZE);
 448         if (ret == -1) {
 449             if (errno != EOPNOTSUPP) {
 450                 sprintf(err_msg, "failed to freeze %s, %s",
 451                         mount->dirname, strerror(errno));
 452                 error_set(err, QERR_QGA_COMMAND_FAILED, err_msg);
 453                 close(fd);
 454                 goto error;
 455             }
 456         } else {
 457             i++;
 458         }
 459         close(fd);
 460     }
 461
 462     guest_fsfreeze_state.status = GUEST_FSFREEZE_STATUS_FROZEN;
 463     guest_fsfreeze_free_mount_list(&mounts);
 464     return i;
 465
 466 error:
 467     guest_fsfreeze_free_mount_list(&mounts);
 468     qmp_guest_fsfreeze_thaw(NULL);
 469     return 0;
 470 }
 471
 472 /*
 473  * Walk list of frozen file systems in the guest, and thaw them.
 474  */
 475 int64_t qmp_guest_fsfreeze_thaw(Error **err)
 476 {
 477     int ret;
 478     GuestFsfreezeMountList mounts;
 479     GuestFsfreezeMount *mount;
 480     int fd, i = 0, logged;
 481
 482     QTAILQ_INIT(&mounts);
 483     ret = guest_fsfreeze_build_mount_list(&mounts);
 484     if (ret) {
 485         error_set(err, QERR_QGA_COMMAND_FAILED,
 486                   "failed to enumerate filesystems");
 487         return 0;
 488     }
 489
 490     QTAILQ_FOREACH(mount, &mounts, next) {
 491         logged = false;
 492         fd = qemu_open(mount->dirname, O_RDONLY);
 493         if (fd == -1) {
 494             continue;
 495         }
 496         /* we have no way of knowing whether a filesystem was actually unfrozen
 497          * as a result of a successful call to FITHAW, only that if an error
 498          * was returned the filesystem was *not* unfrozen by that particular
 499          * call.
 500          *
 501          * since multiple preceeding FIFREEZEs require multiple calls to FITHAW
 502          * to unfreeze, continuing issuing FITHAW until an error is returned,
 503          * in which case either the filesystem is in an unfreezable state, or,
 504          * more likely, it was thawed previously (and remains so afterward).
 505          *
 506          * also, since the most recent successful call is the one that did
 507          * the actual unfreeze, we can use this to provide an accurate count
 508          * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
 509          * may * be useful for determining whether a filesystem was unfrozen
 510          * during the freeze/thaw phase by a process other than qemu-ga.
 511          */
 512         do {
 513             ret = ioctl(fd, FITHAW);
 514             if (ret == 0 && !logged) {
 515                 i++;
 516                 logged = true;
 517             }
 518         } while (ret == 0);
 519         close(fd);
 520     }
 521
 522     guest_fsfreeze_state.status = GUEST_FSFREEZE_STATUS_THAWED;
 523     enable_logging();
 524     guest_fsfreeze_free_mount_list(&mounts);
 525     return i;
 526 }
 527
 528 static void guest_fsfreeze_init(void)
 529 {
 530     guest_fsfreeze_state.status = GUEST_FSFREEZE_STATUS_THAWED;
 531 }
 532
 533 static void guest_fsfreeze_cleanup(void)
 534 {
 535     int64_t ret;
 536     Error *err = NULL;
 537
 538     if (guest_fsfreeze_state.status == GUEST_FSFREEZE_STATUS_FROZEN) {
 539         ret = qmp_guest_fsfreeze_thaw(&err);
 540         if (ret < 0 || err) {
 541             slog("failed to clean up frozen filesystems");
 542         }
 543     }
 544 }
 545 #endif /* CONFIG_FSFREEZE */
 546
 547 #define LINUX_SYS_STATE_FILE "/sys/power/state"
 548 #define SUSPEND_SUPPORTED 0
 549 #define SUSPEND_NOT_SUPPORTED 1
 550
 551 /**
 552  * This function forks twice and the information about the mode support
 553  * status is passed to the qemu-ga process via a pipe.
 554  *
 555  * This approach allows us to keep the way we reap terminated children
 556  * in qemu-ga quite simple.
 557  */
 558 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
 559                                const char *sysfile_str, Error **err)
 560 {
 561     pid_t pid;
 562     ssize_t ret;
 563     char *pmutils_path;
 564     int status, pipefds[2];
 565
 566     if (pipe(pipefds) < 0) {
 567         error_set(err, QERR_UNDEFINED_ERROR);
 568         return;
 569     }
 570
 571     pmutils_path = g_find_program_in_path(pmutils_bin);
 572
 573     pid = fork();
 574     if (!pid) {
 575         struct sigaction act;
 576
 577         memset(&act, 0, sizeof(act));
 578         act.sa_handler = SIG_DFL;
 579         sigaction(SIGCHLD, &act, NULL);
 580
 581         setsid();
 582         close(pipefds[0]);
 583         reopen_fd_to_null(0);
 584         reopen_fd_to_null(1);
 585         reopen_fd_to_null(2);
 586
 587         pid = fork();
 588         if (!pid) {
 589             int fd;
 590             char buf[32]; /* hopefully big enough */
 591
 592             if (pmutils_path) {
 593                 execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
 594             }
 595
 596             /*
 597              * If we get here either pm-utils is not installed or execle() has
 598              * failed. Let's try the manual method if the caller wants it.
 599              */
 600
 601             if (!sysfile_str) {
 602                 _exit(SUSPEND_NOT_SUPPORTED);
 603             }
 604
 605             fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
 606             if (fd < 0) {
 607                 _exit(SUSPEND_NOT_SUPPORTED);
 608             }
 609
 610             ret = read(fd, buf, sizeof(buf)-1);
 611             if (ret <= 0) {
 612                 _exit(SUSPEND_NOT_SUPPORTED);
 613             }
 614             buf[ret] = '\0';
 615
 616             if (strstr(buf, sysfile_str)) {
 617                 _exit(SUSPEND_SUPPORTED);
 618             }
 619
 620             _exit(SUSPEND_NOT_SUPPORTED);
 621         }
 622
 623         if (pid > 0) {
 624             wait(&status);
 625         } else {
 626             status = SUSPEND_NOT_SUPPORTED;
 627         }
 628
 629         ret = write(pipefds[1], &status, sizeof(status));
 630         if (ret != sizeof(status)) {
 631             _exit(EXIT_FAILURE);
 632         }
 633
 634         _exit(EXIT_SUCCESS);
 635     }
 636
 637     close(pipefds[1]);
 638     g_free(pmutils_path);
 639
 640     if (pid < 0) {
 641         error_set(err, QERR_UNDEFINED_ERROR);
 642         goto out;
 643     }
 644
 645     ret = read(pipefds[0], &status, sizeof(status));
 646     if (ret == sizeof(status) && WIFEXITED(status) &&
 647         WEXITSTATUS(status) == SUSPEND_SUPPORTED) {
 648             goto out;
 649     }
 650
 651     error_set(err, QERR_UNSUPPORTED);
 652
 653 out:
 654     close(pipefds[0]);
 655 }
 656
 657 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
 658                           Error **err)
 659 {
 660     pid_t pid;
 661     char *pmutils_path;
 662
 663     pmutils_path = g_find_program_in_path(pmutils_bin);
 664
 665     pid = fork();
 666     if (pid == 0) {
 667         /* child */
 668         int fd;
 669
 670         setsid();
 671         reopen_fd_to_null(0);
 672         reopen_fd_to_null(1);
 673         reopen_fd_to_null(2);
 674
 675         if (pmutils_path) {
 676             execle(pmutils_path, pmutils_bin, NULL, environ);
 677         }
 678
 679         /*
 680          * If we get here either pm-utils is not installed or execle() has
 681          * failed. Let's try the manual method if the caller wants it.
 682          */
 683
 684         if (!sysfile_str) {
 685             _exit(EXIT_FAILURE);
 686         }
 687
 688         fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
 689         if (fd < 0) {
 690             _exit(EXIT_FAILURE);
 691         }
 692
 693         if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
 694             _exit(EXIT_FAILURE);
 695         }
 696
 697         _exit(EXIT_SUCCESS);
 698     }
 699
 700     g_free(pmutils_path);
 701
 702     if (pid < 0) {
 703         error_set(err, QERR_UNDEFINED_ERROR);
 704         return;
 705     }
 706 }
 707
 708 void qmp_guest_suspend_disk(Error **err)
 709 {
 710     bios_supports_mode("pm-is-supported", "--hibernate", "disk", err);
 711     if (error_is_set(err)) {
 712         return;
 713     }
 714
 715     guest_suspend("pm-hibernate", "disk", err);
 716 }
 717
 718 void qmp_guest_suspend_ram(Error **err)
 719 {
 720     bios_supports_mode("pm-is-supported", "--suspend", "mem", err);
 721     if (error_is_set(err)) {
 722         return;
 723     }
 724
 725     guest_suspend("pm-suspend", "mem", err);
 726 }
 727
 728 void qmp_guest_suspend_hybrid(Error **err)
 729 {
 730     bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, err);
 731     if (error_is_set(err)) {
 732         return;
 733     }
 734
 735     guest_suspend("pm-suspend-hybrid", NULL, err);
 736 }
 737
 738 static GuestNetworkInterfaceList *
 739 guest_find_interface(GuestNetworkInterfaceList *head,
 740                      const char *name)
 741 {
 742     for (; head; head = head->next) {
 743         if (strcmp(head->value->name, name) == 0) {
 744             break;
 745         }
 746     }
 747
 748     return head;
 749 }
 750
 751 /*
 752  * Build information about guest interfaces
 753  */
 754 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
 755 {
 756     GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
 757     struct ifaddrs *ifap, *ifa;
 758     char err_msg[512];
 759
 760     if (getifaddrs(&ifap) < 0) {
 761         snprintf(err_msg, sizeof(err_msg),
 762                  "getifaddrs failed: %s", strerror(errno));
 763         error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 764         goto error;
 765     }
 766
 767     for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 768         GuestNetworkInterfaceList *info;
 769         GuestIpAddressList **address_list = NULL, *address_item = NULL;
 770         char addr4[INET_ADDRSTRLEN];
 771         char addr6[INET6_ADDRSTRLEN];
 772         int sock;
 773         struct ifreq ifr;
 774         unsigned char *mac_addr;
 775         void *p;
 776
 777         g_debug("Processing %s interface", ifa->ifa_name);
 778
 779         info = guest_find_interface(head, ifa->ifa_name);
 780
 781         if (!info) {
 782             info = g_malloc0(sizeof(*info));
 783             info->value = g_malloc0(sizeof(*info->value));
 784             info->value->name = g_strdup(ifa->ifa_name);
 785
 786             if (!cur_item) {
 787                 head = cur_item = info;
 788             } else {
 789                 cur_item->next = info;
 790                 cur_item = info;
 791             }
 792         }
 793
 794         if (!info->value->has_hardware_address &&
 795             ifa->ifa_flags & SIOCGIFHWADDR) {
 796             /* we haven't obtained HW address yet */
 797             sock = socket(PF_INET, SOCK_STREAM, 0);
 798             if (sock == -1) {
 799                 snprintf(err_msg, sizeof(err_msg),
 800                          "failed to create socket: %s", strerror(errno));
 801                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 802                 goto error;
 803             }
 804
 805             memset(&ifr, 0, sizeof(ifr));
 806             strncpy(ifr.ifr_name,  info->value->name, IF_NAMESIZE);
 807             if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
 808                 snprintf(err_msg, sizeof(err_msg),
 809                          "failed to get MAC addres of %s: %s",
 810                          ifa->ifa_name,
 811                          strerror(errno));
 812                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 813                 goto error;
 814             }
 815
 816             mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
 817
 818             if (asprintf(&info->value->hardware_address,
 819                          "%02x:%02x:%02x:%02x:%02x:%02x",
 820                          (int) mac_addr[0], (int) mac_addr[1],
 821                          (int) mac_addr[2], (int) mac_addr[3],
 822                          (int) mac_addr[4], (int) mac_addr[5]) == -1) {
 823                 snprintf(err_msg, sizeof(err_msg),
 824                          "failed to format MAC: %s", strerror(errno));
 825                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 826                 goto error;
 827             }
 828
 829             info->value->has_hardware_address = true;
 830             close(sock);
 831         }
 832
 833         if (ifa->ifa_addr &&
 834             ifa->ifa_addr->sa_family == AF_INET) {
 835             /* interface with IPv4 address */
 836             address_item = g_malloc0(sizeof(*address_item));
 837             address_item->value = g_malloc0(sizeof(*address_item->value));
 838             p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
 839             if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
 840                 snprintf(err_msg, sizeof(err_msg),
 841                          "inet_ntop failed : %s", strerror(errno));
 842                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 843                 goto error;
 844             }
 845
 846             address_item->value->ip_address = g_strdup(addr4);
 847             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
 848
 849             if (ifa->ifa_netmask) {
 850                 /* Count the number of set bits in netmask.
 851                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
 852                 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
 853                 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
 854             }
 855         } else if (ifa->ifa_addr &&
 856                    ifa->ifa_addr->sa_family == AF_INET6) {
 857             /* interface with IPv6 address */
 858             address_item = g_malloc0(sizeof(*address_item));
 859             address_item->value = g_malloc0(sizeof(*address_item->value));
 860             p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
 861             if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
 862                 snprintf(err_msg, sizeof(err_msg),
 863                          "inet_ntop failed : %s", strerror(errno));
 864                 error_set(errp, QERR_QGA_COMMAND_FAILED, err_msg);
 865                 goto error;
 866             }
 867
 868             address_item->value->ip_address = g_strdup(addr6);
 869             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
 870
 871             if (ifa->ifa_netmask) {
 872                 /* Count the number of set bits in netmask.
 873                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
 874                 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
 875                 address_item->value->prefix =
 876                     ctpop32(((uint32_t *) p)[0]) +
 877                     ctpop32(((uint32_t *) p)[1]) +
 878                     ctpop32(((uint32_t *) p)[2]) +
 879                     ctpop32(((uint32_t *) p)[3]);
 880             }
 881         }
 882
 883         if (!address_item) {
 884             continue;
 885         }
 886
 887         address_list = &info->value->ip_addresses;
 888
 889         while (*address_list && (*address_list)->next) {
 890             address_list = &(*address_list)->next;
 891         }
 892
 893         if (!*address_list) {
 894             *address_list = address_item;
 895         } else {
 896             (*address_list)->next = address_item;
 897         }
 898
 899         info->value->has_ip_addresses = true;
 900
 901
 902     }
 903
 904     freeifaddrs(ifap);
 905     return head;
 906
 907 error:
 908     freeifaddrs(ifap);
 909     qapi_free_GuestNetworkInterfaceList(head);
 910     return NULL;
 911 }
 912
 913 #else /* defined(__linux__) */
 914
 915 void qmp_guest_suspend_disk(Error **err)
 916 {
 917     error_set(err, QERR_UNSUPPORTED);
 918 }
 919
 920 void qmp_guest_suspend_ram(Error **err)
 921 {
 922     error_set(err, QERR_UNSUPPORTED);
 923 }
 924
 925 void qmp_guest_suspend_hybrid(Error **err)
 926 {
 927     error_set(err, QERR_UNSUPPORTED);
 928 }
 929
 930 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
 931 {
 932     error_set(errp, QERR_UNSUPPORTED);
 933     return NULL;
 934 }
 935
 936 #endif
 937
 938 #if !defined(CONFIG_FSFREEZE)
 939
 940 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
 941 {
 942     error_set(err, QERR_UNSUPPORTED);
 943
 944     return 0;
 945 }
 946
 947 int64_t qmp_guest_fsfreeze_freeze(Error **err)
 948 {
 949     error_set(err, QERR_UNSUPPORTED);
 950
 951     return 0;
 952 }
 953
 954 int64_t qmp_guest_fsfreeze_thaw(Error **err)
 955 {
 956     error_set(err, QERR_UNSUPPORTED);
 957
 958     return 0;
 959 }
 960
 961 #endif
 962
 963 /* register init/cleanup routines for stateful command groups */
 964 void ga_command_state_init(GAState *s, GACommandState *cs)
 965 {
 966 #if defined(CONFIG_FSFREEZE)
 967     ga_command_state_add(cs, guest_fsfreeze_init, guest_fsfreeze_cleanup);
 968 #endif
 969     ga_command_state_add(cs, guest_file_init, NULL);
 970 }