1 /* 2 * QEMU Guest Agent POSIX-specific command implementations 3 * 4 * Copyright IBM Corp. 2011 5 * 6 * Authors: 7 * Michael Roth <mdroth@linux.vnet.ibm.com> 8 * Michal Privoznik <mprivozn@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 */ 13 14 #include "qemu/osdep.h" 15 #include <sys/ioctl.h> 16 #include <sys/utsname.h> 17 #include <sys/wait.h> 18 #include <dirent.h> 19 #include "qemu-common.h" 20 #include "guest-agent-core.h" 21 #include "qga-qapi-commands.h" 22 #include "qapi/error.h" 23 #include "qapi/qmp/qerror.h" 24 #include "qemu/queue.h" 25 #include "qemu/host-utils.h" 26 #include "qemu/sockets.h" 27 #include "qemu/base64.h" 28 #include "qemu/cutils.h" 29 #include "commands-common.h" 30 31 #ifdef HAVE_UTMPX 32 #include <utmpx.h> 33 #endif 34 35 #ifndef CONFIG_HAS_ENVIRON 36 #ifdef __APPLE__ 37 #include <crt_externs.h> 38 #define environ (*_NSGetEnviron()) 39 #else 40 extern char **environ; 41 #endif 42 #endif 43 44 #if defined(__linux__) 45 #include <mntent.h> 46 #include <linux/fs.h> 47 #include <ifaddrs.h> 48 #include <arpa/inet.h> 49 #include <sys/socket.h> 50 #include <net/if.h> 51 #include <sys/statvfs.h> 52 53 #ifdef CONFIG_LIBUDEV 54 #include <libudev.h> 55 #endif 56 57 #ifdef FIFREEZE 58 #define CONFIG_FSFREEZE 59 #endif 60 #ifdef FITRIM 61 #define CONFIG_FSTRIM 62 #endif 63 #endif 64 65 static void ga_wait_child(pid_t pid, int *status, Error **errp) 66 { 67 pid_t rpid; 68 69 *status = 0; 70 71 do { 72 rpid = waitpid(pid, status, 0); 73 } while (rpid == -1 && errno == EINTR); 74 75 if (rpid == -1) { 76 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)", 77 pid); 78 return; 79 } 80 81 g_assert(rpid == pid); 82 } 83 84 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp) 85 { 86 const char *shutdown_flag; 87 Error *local_err = NULL; 88 pid_t pid; 89 int status; 90 91 slog("guest-shutdown called, mode: %s", mode); 92 if (!has_mode || strcmp(mode, "powerdown") == 0) { 93 shutdown_flag = "-P"; 94 } else if (strcmp(mode, "halt") == 0) { 95 shutdown_flag = "-H"; 96 } else if (strcmp(mode, "reboot") == 0) { 97 shutdown_flag = "-r"; 98 } else { 99 error_setg(errp, 100 "mode is invalid (valid values are: halt|powerdown|reboot"); 101 return; 102 } 103 104 pid = fork(); 105 if (pid == 0) { 106 /* child, start the shutdown */ 107 setsid(); 108 reopen_fd_to_null(0); 109 reopen_fd_to_null(1); 110 reopen_fd_to_null(2); 111 112 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0", 113 "hypervisor initiated shutdown", (char*)NULL, environ); 114 _exit(EXIT_FAILURE); 115 } else if (pid < 0) { 116 error_setg_errno(errp, errno, "failed to create child process"); 117 return; 118 } 119 120 ga_wait_child(pid, &status, &local_err); 121 if (local_err) { 122 error_propagate(errp, local_err); 123 return; 124 } 125 126 if (!WIFEXITED(status)) { 127 error_setg(errp, "child process has terminated abnormally"); 128 return; 129 } 130 131 if (WEXITSTATUS(status)) { 132 error_setg(errp, "child process has failed to shutdown"); 133 return; 134 } 135 136 /* succeeded */ 137 } 138 139 int64_t qmp_guest_get_time(Error **errp) 140 { 141 int ret; 142 qemu_timeval tq; 143 144 ret = qemu_gettimeofday(&tq); 145 if (ret < 0) { 146 error_setg_errno(errp, errno, "Failed to get time"); 147 return -1; 148 } 149 150 return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000; 151 } 152 153 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp) 154 { 155 int ret; 156 int status; 157 pid_t pid; 158 Error *local_err = NULL; 159 struct timeval tv; 160 static const char hwclock_path[] = "/sbin/hwclock"; 161 static int hwclock_available = -1; 162 163 if (hwclock_available < 0) { 164 hwclock_available = (access(hwclock_path, X_OK) == 0); 165 } 166 167 if (!hwclock_available) { 168 error_setg(errp, QERR_UNSUPPORTED); 169 return; 170 } 171 172 /* If user has passed a time, validate and set it. */ 173 if (has_time) { 174 GDate date = { 0, }; 175 176 /* year-2038 will overflow in case time_t is 32bit */ 177 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) { 178 error_setg(errp, "Time %" PRId64 " is too large", time_ns); 179 return; 180 } 181 182 tv.tv_sec = time_ns / 1000000000; 183 tv.tv_usec = (time_ns % 1000000000) / 1000; 184 g_date_set_time_t(&date, tv.tv_sec); 185 if (date.year < 1970 || date.year >= 2070) { 186 error_setg_errno(errp, errno, "Invalid time"); 187 return; 188 } 189 190 ret = settimeofday(&tv, NULL); 191 if (ret < 0) { 192 error_setg_errno(errp, errno, "Failed to set time to guest"); 193 return; 194 } 195 } 196 197 /* Now, if user has passed a time to set and the system time is set, we 198 * just need to synchronize the hardware clock. However, if no time was 199 * passed, user is requesting the opposite: set the system time from the 200 * hardware clock (RTC). */ 201 pid = fork(); 202 if (pid == 0) { 203 setsid(); 204 reopen_fd_to_null(0); 205 reopen_fd_to_null(1); 206 reopen_fd_to_null(2); 207 208 /* Use '/sbin/hwclock -w' to set RTC from the system time, 209 * or '/sbin/hwclock -s' to set the system time from RTC. */ 210 execle(hwclock_path, "hwclock", has_time ? "-w" : "-s", 211 NULL, environ); 212 _exit(EXIT_FAILURE); 213 } else if (pid < 0) { 214 error_setg_errno(errp, errno, "failed to create child process"); 215 return; 216 } 217 218 ga_wait_child(pid, &status, &local_err); 219 if (local_err) { 220 error_propagate(errp, local_err); 221 return; 222 } 223 224 if (!WIFEXITED(status)) { 225 error_setg(errp, "child process has terminated abnormally"); 226 return; 227 } 228 229 if (WEXITSTATUS(status)) { 230 error_setg(errp, "hwclock failed to set hardware clock to system time"); 231 return; 232 } 233 } 234 235 typedef enum { 236 RW_STATE_NEW, 237 RW_STATE_READING, 238 RW_STATE_WRITING, 239 } RwState; 240 241 struct GuestFileHandle { 242 uint64_t id; 243 FILE *fh; 244 RwState state; 245 QTAILQ_ENTRY(GuestFileHandle) next; 246 }; 247 248 static struct { 249 QTAILQ_HEAD(, GuestFileHandle) filehandles; 250 } guest_file_state = { 251 .filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles), 252 }; 253 254 static int64_t guest_file_handle_add(FILE *fh, Error **errp) 255 { 256 GuestFileHandle *gfh; 257 int64_t handle; 258 259 handle = ga_get_fd_handle(ga_state, errp); 260 if (handle < 0) { 261 return -1; 262 } 263 264 gfh = g_new0(GuestFileHandle, 1); 265 gfh->id = handle; 266 gfh->fh = fh; 267 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next); 268 269 return handle; 270 } 271 272 GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp) 273 { 274 GuestFileHandle *gfh; 275 276 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next) 277 { 278 if (gfh->id == id) { 279 return gfh; 280 } 281 } 282 283 error_setg(errp, "handle '%" PRId64 "' has not been found", id); 284 return NULL; 285 } 286 287 typedef const char * const ccpc; 288 289 #ifndef O_BINARY 290 #define O_BINARY 0 291 #endif 292 293 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */ 294 static const struct { 295 ccpc *forms; 296 int oflag_base; 297 } guest_file_open_modes[] = { 298 { (ccpc[]){ "r", NULL }, O_RDONLY }, 299 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY }, 300 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC }, 301 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY }, 302 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND }, 303 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY }, 304 { (ccpc[]){ "r+", NULL }, O_RDWR }, 305 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY }, 306 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC }, 307 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY }, 308 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND }, 309 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY } 310 }; 311 312 static int 313 find_open_flag(const char *mode_str, Error **errp) 314 { 315 unsigned mode; 316 317 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) { 318 ccpc *form; 319 320 form = guest_file_open_modes[mode].forms; 321 while (*form != NULL && strcmp(*form, mode_str) != 0) { 322 ++form; 323 } 324 if (*form != NULL) { 325 break; 326 } 327 } 328 329 if (mode == ARRAY_SIZE(guest_file_open_modes)) { 330 error_setg(errp, "invalid file open mode '%s'", mode_str); 331 return -1; 332 } 333 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK; 334 } 335 336 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \ 337 S_IRGRP | S_IWGRP | \ 338 S_IROTH | S_IWOTH) 339 340 static FILE * 341 safe_open_or_create(const char *path, const char *mode, Error **errp) 342 { 343 Error *local_err = NULL; 344 int oflag; 345 346 oflag = find_open_flag(mode, &local_err); 347 if (local_err == NULL) { 348 int fd; 349 350 /* If the caller wants / allows creation of a new file, we implement it 351 * with a two step process: open() + (open() / fchmod()). 352 * 353 * First we insist on creating the file exclusively as a new file. If 354 * that succeeds, we're free to set any file-mode bits on it. (The 355 * motivation is that we want to set those file-mode bits independently 356 * of the current umask.) 357 * 358 * If the exclusive creation fails because the file already exists 359 * (EEXIST is not possible for any other reason), we just attempt to 360 * open the file, but in this case we won't be allowed to change the 361 * file-mode bits on the preexistent file. 362 * 363 * The pathname should never disappear between the two open()s in 364 * practice. If it happens, then someone very likely tried to race us. 365 * In this case just go ahead and report the ENOENT from the second 366 * open() to the caller. 367 * 368 * If the caller wants to open a preexistent file, then the first 369 * open() is decisive and its third argument is ignored, and the second 370 * open() and the fchmod() are never called. 371 */ 372 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0); 373 if (fd == -1 && errno == EEXIST) { 374 oflag &= ~(unsigned)O_CREAT; 375 fd = open(path, oflag); 376 } 377 378 if (fd == -1) { 379 error_setg_errno(&local_err, errno, "failed to open file '%s' " 380 "(mode: '%s')", path, mode); 381 } else { 382 qemu_set_cloexec(fd); 383 384 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) { 385 error_setg_errno(&local_err, errno, "failed to set permission " 386 "0%03o on new file '%s' (mode: '%s')", 387 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode); 388 } else { 389 FILE *f; 390 391 f = fdopen(fd, mode); 392 if (f == NULL) { 393 error_setg_errno(&local_err, errno, "failed to associate " 394 "stdio stream with file descriptor %d, " 395 "file '%s' (mode: '%s')", fd, path, mode); 396 } else { 397 return f; 398 } 399 } 400 401 close(fd); 402 if (oflag & O_CREAT) { 403 unlink(path); 404 } 405 } 406 } 407 408 error_propagate(errp, local_err); 409 return NULL; 410 } 411 412 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, 413 Error **errp) 414 { 415 FILE *fh; 416 Error *local_err = NULL; 417 int64_t handle; 418 419 if (!has_mode) { 420 mode = "r"; 421 } 422 slog("guest-file-open called, filepath: %s, mode: %s", path, mode); 423 fh = safe_open_or_create(path, mode, &local_err); 424 if (local_err != NULL) { 425 error_propagate(errp, local_err); 426 return -1; 427 } 428 429 /* set fd non-blocking to avoid common use cases (like reading from a 430 * named pipe) from hanging the agent 431 */ 432 qemu_set_nonblock(fileno(fh)); 433 434 handle = guest_file_handle_add(fh, errp); 435 if (handle < 0) { 436 fclose(fh); 437 return -1; 438 } 439 440 slog("guest-file-open, handle: %" PRId64, handle); 441 return handle; 442 } 443 444 void qmp_guest_file_close(int64_t handle, Error **errp) 445 { 446 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 447 int ret; 448 449 slog("guest-file-close called, handle: %" PRId64, handle); 450 if (!gfh) { 451 return; 452 } 453 454 ret = fclose(gfh->fh); 455 if (ret == EOF) { 456 error_setg_errno(errp, errno, "failed to close handle"); 457 return; 458 } 459 460 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next); 461 g_free(gfh); 462 } 463 464 GuestFileRead *guest_file_read_unsafe(GuestFileHandle *gfh, 465 int64_t count, Error **errp) 466 { 467 GuestFileRead *read_data = NULL; 468 guchar *buf; 469 FILE *fh = gfh->fh; 470 size_t read_count; 471 472 /* explicitly flush when switching from writing to reading */ 473 if (gfh->state == RW_STATE_WRITING) { 474 int ret = fflush(fh); 475 if (ret == EOF) { 476 error_setg_errno(errp, errno, "failed to flush file"); 477 return NULL; 478 } 479 gfh->state = RW_STATE_NEW; 480 } 481 482 buf = g_malloc0(count+1); 483 read_count = fread(buf, 1, count, fh); 484 if (ferror(fh)) { 485 error_setg_errno(errp, errno, "failed to read file"); 486 } else { 487 buf[read_count] = 0; 488 read_data = g_new0(GuestFileRead, 1); 489 read_data->count = read_count; 490 read_data->eof = feof(fh); 491 if (read_count) { 492 read_data->buf_b64 = g_base64_encode(buf, read_count); 493 } 494 gfh->state = RW_STATE_READING; 495 } 496 g_free(buf); 497 clearerr(fh); 498 499 return read_data; 500 } 501 502 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64, 503 bool has_count, int64_t count, 504 Error **errp) 505 { 506 GuestFileWrite *write_data = NULL; 507 guchar *buf; 508 gsize buf_len; 509 int write_count; 510 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 511 FILE *fh; 512 513 if (!gfh) { 514 return NULL; 515 } 516 517 fh = gfh->fh; 518 519 if (gfh->state == RW_STATE_READING) { 520 int ret = fseek(fh, 0, SEEK_CUR); 521 if (ret == -1) { 522 error_setg_errno(errp, errno, "failed to seek file"); 523 return NULL; 524 } 525 gfh->state = RW_STATE_NEW; 526 } 527 528 buf = qbase64_decode(buf_b64, -1, &buf_len, errp); 529 if (!buf) { 530 return NULL; 531 } 532 533 if (!has_count) { 534 count = buf_len; 535 } else if (count < 0 || count > buf_len) { 536 error_setg(errp, "value '%" PRId64 "' is invalid for argument count", 537 count); 538 g_free(buf); 539 return NULL; 540 } 541 542 write_count = fwrite(buf, 1, count, fh); 543 if (ferror(fh)) { 544 error_setg_errno(errp, errno, "failed to write to file"); 545 slog("guest-file-write failed, handle: %" PRId64, handle); 546 } else { 547 write_data = g_new0(GuestFileWrite, 1); 548 write_data->count = write_count; 549 write_data->eof = feof(fh); 550 gfh->state = RW_STATE_WRITING; 551 } 552 g_free(buf); 553 clearerr(fh); 554 555 return write_data; 556 } 557 558 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset, 559 GuestFileWhence *whence_code, 560 Error **errp) 561 { 562 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 563 GuestFileSeek *seek_data = NULL; 564 FILE *fh; 565 int ret; 566 int whence; 567 Error *err = NULL; 568 569 if (!gfh) { 570 return NULL; 571 } 572 573 /* We stupidly exposed 'whence':'int' in our qapi */ 574 whence = ga_parse_whence(whence_code, &err); 575 if (err) { 576 error_propagate(errp, err); 577 return NULL; 578 } 579 580 fh = gfh->fh; 581 ret = fseek(fh, offset, whence); 582 if (ret == -1) { 583 error_setg_errno(errp, errno, "failed to seek file"); 584 if (errno == ESPIPE) { 585 /* file is non-seekable, stdio shouldn't be buffering anyways */ 586 gfh->state = RW_STATE_NEW; 587 } 588 } else { 589 seek_data = g_new0(GuestFileSeek, 1); 590 seek_data->position = ftell(fh); 591 seek_data->eof = feof(fh); 592 gfh->state = RW_STATE_NEW; 593 } 594 clearerr(fh); 595 596 return seek_data; 597 } 598 599 void qmp_guest_file_flush(int64_t handle, Error **errp) 600 { 601 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 602 FILE *fh; 603 int ret; 604 605 if (!gfh) { 606 return; 607 } 608 609 fh = gfh->fh; 610 ret = fflush(fh); 611 if (ret == EOF) { 612 error_setg_errno(errp, errno, "failed to flush file"); 613 } else { 614 gfh->state = RW_STATE_NEW; 615 } 616 } 617 618 /* linux-specific implementations. avoid this if at all possible. */ 619 #if defined(__linux__) 620 621 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM) 622 typedef struct FsMount { 623 char *dirname; 624 char *devtype; 625 unsigned int devmajor, devminor; 626 QTAILQ_ENTRY(FsMount) next; 627 } FsMount; 628 629 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList; 630 631 static void free_fs_mount_list(FsMountList *mounts) 632 { 633 FsMount *mount, *temp; 634 635 if (!mounts) { 636 return; 637 } 638 639 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) { 640 QTAILQ_REMOVE(mounts, mount, next); 641 g_free(mount->dirname); 642 g_free(mount->devtype); 643 g_free(mount); 644 } 645 } 646 647 static int dev_major_minor(const char *devpath, 648 unsigned int *devmajor, unsigned int *devminor) 649 { 650 struct stat st; 651 652 *devmajor = 0; 653 *devminor = 0; 654 655 if (stat(devpath, &st) < 0) { 656 slog("failed to stat device file '%s': %s", devpath, strerror(errno)); 657 return -1; 658 } 659 if (S_ISDIR(st.st_mode)) { 660 /* It is bind mount */ 661 return -2; 662 } 663 if (S_ISBLK(st.st_mode)) { 664 *devmajor = major(st.st_rdev); 665 *devminor = minor(st.st_rdev); 666 return 0; 667 } 668 return -1; 669 } 670 671 /* 672 * Walk the mount table and build a list of local file systems 673 */ 674 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp) 675 { 676 struct mntent *ment; 677 FsMount *mount; 678 char const *mtab = "/proc/self/mounts"; 679 FILE *fp; 680 unsigned int devmajor, devminor; 681 682 fp = setmntent(mtab, "r"); 683 if (!fp) { 684 error_setg(errp, "failed to open mtab file: '%s'", mtab); 685 return; 686 } 687 688 while ((ment = getmntent(fp))) { 689 /* 690 * An entry which device name doesn't start with a '/' is 691 * either a dummy file system or a network file system. 692 * Add special handling for smbfs and cifs as is done by 693 * coreutils as well. 694 */ 695 if ((ment->mnt_fsname[0] != '/') || 696 (strcmp(ment->mnt_type, "smbfs") == 0) || 697 (strcmp(ment->mnt_type, "cifs") == 0)) { 698 continue; 699 } 700 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) { 701 /* Skip bind mounts */ 702 continue; 703 } 704 705 mount = g_new0(FsMount, 1); 706 mount->dirname = g_strdup(ment->mnt_dir); 707 mount->devtype = g_strdup(ment->mnt_type); 708 mount->devmajor = devmajor; 709 mount->devminor = devminor; 710 711 QTAILQ_INSERT_TAIL(mounts, mount, next); 712 } 713 714 endmntent(fp); 715 } 716 717 static void decode_mntname(char *name, int len) 718 { 719 int i, j = 0; 720 for (i = 0; i <= len; i++) { 721 if (name[i] != '\\') { 722 name[j++] = name[i]; 723 } else if (name[i + 1] == '\\') { 724 name[j++] = '\\'; 725 i++; 726 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' && 727 name[i + 2] >= '0' && name[i + 2] <= '7' && 728 name[i + 3] >= '0' && name[i + 3] <= '7') { 729 name[j++] = (name[i + 1] - '0') * 64 + 730 (name[i + 2] - '0') * 8 + 731 (name[i + 3] - '0'); 732 i += 3; 733 } else { 734 name[j++] = name[i]; 735 } 736 } 737 } 738 739 static void build_fs_mount_list(FsMountList *mounts, Error **errp) 740 { 741 FsMount *mount; 742 char const *mountinfo = "/proc/self/mountinfo"; 743 FILE *fp; 744 char *line = NULL, *dash; 745 size_t n; 746 char check; 747 unsigned int devmajor, devminor; 748 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e; 749 750 fp = fopen(mountinfo, "r"); 751 if (!fp) { 752 build_fs_mount_list_from_mtab(mounts, errp); 753 return; 754 } 755 756 while (getline(&line, &n, fp) != -1) { 757 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c", 758 &devmajor, &devminor, &dir_s, &dir_e, &check); 759 if (ret < 3) { 760 continue; 761 } 762 dash = strstr(line + dir_e, " - "); 763 if (!dash) { 764 continue; 765 } 766 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c", 767 &type_s, &type_e, &dev_s, &dev_e, &check); 768 if (ret < 1) { 769 continue; 770 } 771 line[dir_e] = 0; 772 dash[type_e] = 0; 773 dash[dev_e] = 0; 774 decode_mntname(line + dir_s, dir_e - dir_s); 775 decode_mntname(dash + dev_s, dev_e - dev_s); 776 if (devmajor == 0) { 777 /* btrfs reports major number = 0 */ 778 if (strcmp("btrfs", dash + type_s) != 0 || 779 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) { 780 continue; 781 } 782 } 783 784 mount = g_new0(FsMount, 1); 785 mount->dirname = g_strdup(line + dir_s); 786 mount->devtype = g_strdup(dash + type_s); 787 mount->devmajor = devmajor; 788 mount->devminor = devminor; 789 790 QTAILQ_INSERT_TAIL(mounts, mount, next); 791 } 792 free(line); 793 794 fclose(fp); 795 } 796 #endif 797 798 #if defined(CONFIG_FSFREEZE) 799 800 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp) 801 { 802 char *path; 803 char *dpath; 804 char *driver = NULL; 805 char buf[PATH_MAX]; 806 ssize_t len; 807 808 path = g_strndup(syspath, pathlen); 809 dpath = g_strdup_printf("%s/driver", path); 810 len = readlink(dpath, buf, sizeof(buf) - 1); 811 if (len != -1) { 812 buf[len] = 0; 813 driver = g_path_get_basename(buf); 814 } 815 g_free(dpath); 816 g_free(path); 817 return driver; 818 } 819 820 static int compare_uint(const void *_a, const void *_b) 821 { 822 unsigned int a = *(unsigned int *)_a; 823 unsigned int b = *(unsigned int *)_b; 824 825 return a < b ? -1 : a > b ? 1 : 0; 826 } 827 828 /* Walk the specified sysfs and build a sorted list of host or ata numbers */ 829 static int build_hosts(char const *syspath, char const *host, bool ata, 830 unsigned int *hosts, int hosts_max, Error **errp) 831 { 832 char *path; 833 DIR *dir; 834 struct dirent *entry; 835 int i = 0; 836 837 path = g_strndup(syspath, host - syspath); 838 dir = opendir(path); 839 if (!dir) { 840 error_setg_errno(errp, errno, "opendir(\"%s\")", path); 841 g_free(path); 842 return -1; 843 } 844 845 while (i < hosts_max) { 846 entry = readdir(dir); 847 if (!entry) { 848 break; 849 } 850 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) { 851 ++i; 852 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) { 853 ++i; 854 } 855 } 856 857 qsort(hosts, i, sizeof(hosts[0]), compare_uint); 858 859 g_free(path); 860 closedir(dir); 861 return i; 862 } 863 864 /* 865 * Store disk device info for devices on the PCI bus. 866 * Returns true if information has been stored, or false for failure. 867 */ 868 static bool build_guest_fsinfo_for_pci_dev(char const *syspath, 869 GuestDiskAddress *disk, 870 Error **errp) 871 { 872 unsigned int pci[4], host, hosts[8], tgt[3]; 873 int i, nhosts = 0, pcilen; 874 GuestPCIAddress *pciaddr = disk->pci_controller; 875 bool has_ata = false, has_host = false, has_tgt = false; 876 char *p, *q, *driver = NULL; 877 bool ret = false; 878 879 p = strstr(syspath, "/devices/pci"); 880 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", 881 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { 882 g_debug("only pci device is supported: sysfs path '%s'", syspath); 883 return false; 884 } 885 886 p += 12 + pcilen; 887 while (true) { 888 driver = get_pci_driver(syspath, p - syspath, errp); 889 if (driver && (g_str_equal(driver, "ata_piix") || 890 g_str_equal(driver, "sym53c8xx") || 891 g_str_equal(driver, "virtio-pci") || 892 g_str_equal(driver, "ahci"))) { 893 break; 894 } 895 896 g_free(driver); 897 if (sscanf(p, "/%x:%x:%x.%x%n", 898 pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) { 899 p += pcilen; 900 continue; 901 } 902 903 g_debug("unsupported driver or sysfs path '%s'", syspath); 904 return false; 905 } 906 907 p = strstr(syspath, "/target"); 908 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u", 909 tgt, tgt + 1, tgt + 2) == 3) { 910 has_tgt = true; 911 } 912 913 p = strstr(syspath, "/ata"); 914 if (p) { 915 q = p + 4; 916 has_ata = true; 917 } else { 918 p = strstr(syspath, "/host"); 919 q = p + 5; 920 } 921 if (p && sscanf(q, "%u", &host) == 1) { 922 has_host = true; 923 nhosts = build_hosts(syspath, p, has_ata, hosts, 924 ARRAY_SIZE(hosts), errp); 925 if (nhosts < 0) { 926 goto cleanup; 927 } 928 } 929 930 pciaddr->domain = pci[0]; 931 pciaddr->bus = pci[1]; 932 pciaddr->slot = pci[2]; 933 pciaddr->function = pci[3]; 934 935 if (strcmp(driver, "ata_piix") == 0) { 936 /* a host per ide bus, target*:0:<unit>:0 */ 937 if (!has_host || !has_tgt) { 938 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 939 goto cleanup; 940 } 941 for (i = 0; i < nhosts; i++) { 942 if (host == hosts[i]) { 943 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE; 944 disk->bus = i; 945 disk->unit = tgt[1]; 946 break; 947 } 948 } 949 if (i >= nhosts) { 950 g_debug("no host for '%s' (driver '%s')", syspath, driver); 951 goto cleanup; 952 } 953 } else if (strcmp(driver, "sym53c8xx") == 0) { 954 /* scsi(LSI Logic): target*:0:<unit>:0 */ 955 if (!has_tgt) { 956 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 957 goto cleanup; 958 } 959 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 960 disk->unit = tgt[1]; 961 } else if (strcmp(driver, "virtio-pci") == 0) { 962 if (has_tgt) { 963 /* virtio-scsi: target*:0:0:<unit> */ 964 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 965 disk->unit = tgt[2]; 966 } else { 967 /* virtio-blk: 1 disk per 1 device */ 968 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO; 969 } 970 } else if (strcmp(driver, "ahci") == 0) { 971 /* ahci: 1 host per 1 unit */ 972 if (!has_host || !has_tgt) { 973 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 974 goto cleanup; 975 } 976 for (i = 0; i < nhosts; i++) { 977 if (host == hosts[i]) { 978 disk->unit = i; 979 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA; 980 break; 981 } 982 } 983 if (i >= nhosts) { 984 g_debug("no host for '%s' (driver '%s')", syspath, driver); 985 goto cleanup; 986 } 987 } else { 988 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath); 989 goto cleanup; 990 } 991 992 ret = true; 993 994 cleanup: 995 g_free(driver); 996 return ret; 997 } 998 999 /* 1000 * Store disk device info for non-PCI virtio devices (for example s390x 1001 * channel I/O devices). Returns true if information has been stored, or 1002 * false for failure. 1003 */ 1004 static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath, 1005 GuestDiskAddress *disk, 1006 Error **errp) 1007 { 1008 unsigned int tgt[3]; 1009 char *p; 1010 1011 if (!strstr(syspath, "/virtio") || !strstr(syspath, "/block")) { 1012 g_debug("Unsupported virtio device '%s'", syspath); 1013 return false; 1014 } 1015 1016 p = strstr(syspath, "/target"); 1017 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u", 1018 &tgt[0], &tgt[1], &tgt[2]) == 3) { 1019 /* virtio-scsi: target*:0:<target>:<unit> */ 1020 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 1021 disk->bus = tgt[0]; 1022 disk->target = tgt[1]; 1023 disk->unit = tgt[2]; 1024 } else { 1025 /* virtio-blk: 1 disk per 1 device */ 1026 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO; 1027 } 1028 1029 return true; 1030 } 1031 1032 /* Store disk device info specified by @sysfs into @fs */ 1033 static void build_guest_fsinfo_for_real_device(char const *syspath, 1034 GuestFilesystemInfo *fs, 1035 Error **errp) 1036 { 1037 GuestDiskAddress *disk; 1038 GuestPCIAddress *pciaddr; 1039 bool has_hwinf; 1040 #ifdef CONFIG_LIBUDEV 1041 struct udev *udev = NULL; 1042 struct udev_device *udevice = NULL; 1043 #endif 1044 1045 pciaddr = g_new0(GuestPCIAddress, 1); 1046 pciaddr->domain = -1; /* -1 means field is invalid */ 1047 pciaddr->bus = -1; 1048 pciaddr->slot = -1; 1049 pciaddr->function = -1; 1050 1051 disk = g_new0(GuestDiskAddress, 1); 1052 disk->pci_controller = pciaddr; 1053 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN; 1054 1055 #ifdef CONFIG_LIBUDEV 1056 udev = udev_new(); 1057 udevice = udev_device_new_from_syspath(udev, syspath); 1058 if (udev == NULL || udevice == NULL) { 1059 g_debug("failed to query udev"); 1060 } else { 1061 const char *devnode, *serial; 1062 devnode = udev_device_get_devnode(udevice); 1063 if (devnode != NULL) { 1064 disk->dev = g_strdup(devnode); 1065 disk->has_dev = true; 1066 } 1067 serial = udev_device_get_property_value(udevice, "ID_SERIAL"); 1068 if (serial != NULL && *serial != 0) { 1069 disk->serial = g_strdup(serial); 1070 disk->has_serial = true; 1071 } 1072 } 1073 1074 udev_unref(udev); 1075 udev_device_unref(udevice); 1076 #endif 1077 1078 if (strstr(syspath, "/devices/pci")) { 1079 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp); 1080 } else if (strstr(syspath, "/virtio")) { 1081 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1082 } else { 1083 g_debug("Unsupported device type for '%s'", syspath); 1084 has_hwinf = false; 1085 } 1086 1087 if (has_hwinf || disk->has_dev || disk->has_serial) { 1088 QAPI_LIST_PREPEND(fs->disk, disk); 1089 } else { 1090 qapi_free_GuestDiskAddress(disk); 1091 } 1092 } 1093 1094 static void build_guest_fsinfo_for_device(char const *devpath, 1095 GuestFilesystemInfo *fs, 1096 Error **errp); 1097 1098 /* Store a list of slave devices of virtual volume specified by @syspath into 1099 * @fs */ 1100 static void build_guest_fsinfo_for_virtual_device(char const *syspath, 1101 GuestFilesystemInfo *fs, 1102 Error **errp) 1103 { 1104 Error *err = NULL; 1105 DIR *dir; 1106 char *dirpath; 1107 struct dirent *entry; 1108 1109 dirpath = g_strdup_printf("%s/slaves", syspath); 1110 dir = opendir(dirpath); 1111 if (!dir) { 1112 if (errno != ENOENT) { 1113 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath); 1114 } 1115 g_free(dirpath); 1116 return; 1117 } 1118 1119 for (;;) { 1120 errno = 0; 1121 entry = readdir(dir); 1122 if (entry == NULL) { 1123 if (errno) { 1124 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath); 1125 } 1126 break; 1127 } 1128 1129 if (entry->d_type == DT_LNK) { 1130 char *path; 1131 1132 g_debug(" slave device '%s'", entry->d_name); 1133 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name); 1134 build_guest_fsinfo_for_device(path, fs, &err); 1135 g_free(path); 1136 1137 if (err) { 1138 error_propagate(errp, err); 1139 break; 1140 } 1141 } 1142 } 1143 1144 g_free(dirpath); 1145 closedir(dir); 1146 } 1147 1148 static bool is_disk_virtual(const char *devpath, Error **errp) 1149 { 1150 g_autofree char *syspath = realpath(devpath, NULL); 1151 1152 if (!syspath) { 1153 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1154 return false; 1155 } 1156 return strstr(syspath, "/devices/virtual/block/") != NULL; 1157 } 1158 1159 /* Dispatch to functions for virtual/real device */ 1160 static void build_guest_fsinfo_for_device(char const *devpath, 1161 GuestFilesystemInfo *fs, 1162 Error **errp) 1163 { 1164 ERRP_GUARD(); 1165 g_autofree char *syspath = NULL; 1166 bool is_virtual = false; 1167 1168 syspath = realpath(devpath, NULL); 1169 if (!syspath) { 1170 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1171 return; 1172 } 1173 1174 if (!fs->name) { 1175 fs->name = g_path_get_basename(syspath); 1176 } 1177 1178 g_debug(" parse sysfs path '%s'", syspath); 1179 is_virtual = is_disk_virtual(syspath, errp); 1180 if (*errp != NULL) { 1181 return; 1182 } 1183 if (is_virtual) { 1184 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1185 } else { 1186 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1187 } 1188 } 1189 1190 #ifdef CONFIG_LIBUDEV 1191 1192 /* 1193 * Wrapper around build_guest_fsinfo_for_device() for getting just 1194 * the disk address. 1195 */ 1196 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp) 1197 { 1198 g_autoptr(GuestFilesystemInfo) fs = NULL; 1199 1200 fs = g_new0(GuestFilesystemInfo, 1); 1201 build_guest_fsinfo_for_device(syspath, fs, errp); 1202 if (fs->disk != NULL) { 1203 return g_steal_pointer(&fs->disk->value); 1204 } 1205 return NULL; 1206 } 1207 1208 static char *get_alias_for_syspath(const char *syspath) 1209 { 1210 struct udev *udev = NULL; 1211 struct udev_device *udevice = NULL; 1212 char *ret = NULL; 1213 1214 udev = udev_new(); 1215 if (udev == NULL) { 1216 g_debug("failed to query udev"); 1217 goto out; 1218 } 1219 udevice = udev_device_new_from_syspath(udev, syspath); 1220 if (udevice == NULL) { 1221 g_debug("failed to query udev for path: %s", syspath); 1222 goto out; 1223 } else { 1224 const char *alias = udev_device_get_property_value( 1225 udevice, "DM_NAME"); 1226 /* 1227 * NULL means there was an error and empty string means there is no 1228 * alias. In case of no alias we return NULL instead of empty string. 1229 */ 1230 if (alias == NULL) { 1231 g_debug("failed to query udev for device alias for: %s", 1232 syspath); 1233 } else if (*alias != 0) { 1234 ret = g_strdup(alias); 1235 } 1236 } 1237 1238 out: 1239 udev_unref(udev); 1240 udev_device_unref(udevice); 1241 return ret; 1242 } 1243 1244 static char *get_device_for_syspath(const char *syspath) 1245 { 1246 struct udev *udev = NULL; 1247 struct udev_device *udevice = NULL; 1248 char *ret = NULL; 1249 1250 udev = udev_new(); 1251 if (udev == NULL) { 1252 g_debug("failed to query udev"); 1253 goto out; 1254 } 1255 udevice = udev_device_new_from_syspath(udev, syspath); 1256 if (udevice == NULL) { 1257 g_debug("failed to query udev for path: %s", syspath); 1258 goto out; 1259 } else { 1260 ret = g_strdup(udev_device_get_devnode(udevice)); 1261 } 1262 1263 out: 1264 udev_unref(udev); 1265 udev_device_unref(udevice); 1266 return ret; 1267 } 1268 1269 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk) 1270 { 1271 g_autofree char *deps_dir = NULL; 1272 const gchar *dep; 1273 GDir *dp_deps = NULL; 1274 1275 /* List dependent disks */ 1276 deps_dir = g_strdup_printf("%s/slaves", disk_dir); 1277 g_debug(" listing entries in: %s", deps_dir); 1278 dp_deps = g_dir_open(deps_dir, 0, NULL); 1279 if (dp_deps == NULL) { 1280 g_debug("failed to list entries in %s", deps_dir); 1281 return; 1282 } 1283 disk->has_dependencies = true; 1284 while ((dep = g_dir_read_name(dp_deps)) != NULL) { 1285 g_autofree char *dep_dir = NULL; 1286 char *dev_name; 1287 1288 /* Add dependent disks */ 1289 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep); 1290 dev_name = get_device_for_syspath(dep_dir); 1291 if (dev_name != NULL) { 1292 g_debug(" adding dependent device: %s", dev_name); 1293 QAPI_LIST_PREPEND(disk->dependencies, dev_name); 1294 } 1295 } 1296 g_dir_close(dp_deps); 1297 } 1298 1299 /* 1300 * Detect partitions subdirectory, name is "<disk_name><number>" or 1301 * "<disk_name>p<number>" 1302 * 1303 * @disk_name -- last component of /sys path (e.g. sda) 1304 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda) 1305 * @disk_dev -- device node of the disk (e.g. /dev/sda) 1306 */ 1307 static GuestDiskInfoList *get_disk_partitions( 1308 GuestDiskInfoList *list, 1309 const char *disk_name, const char *disk_dir, 1310 const char *disk_dev) 1311 { 1312 GuestDiskInfoList *ret = list; 1313 struct dirent *de_disk; 1314 DIR *dp_disk = NULL; 1315 size_t len = strlen(disk_name); 1316 1317 dp_disk = opendir(disk_dir); 1318 while ((de_disk = readdir(dp_disk)) != NULL) { 1319 g_autofree char *partition_dir = NULL; 1320 char *dev_name; 1321 GuestDiskInfo *partition; 1322 1323 if (!(de_disk->d_type & DT_DIR)) { 1324 continue; 1325 } 1326 1327 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 && 1328 ((*(de_disk->d_name + len) == 'p' && 1329 isdigit(*(de_disk->d_name + len + 1))) || 1330 isdigit(*(de_disk->d_name + len))))) { 1331 continue; 1332 } 1333 1334 partition_dir = g_strdup_printf("%s/%s", 1335 disk_dir, de_disk->d_name); 1336 dev_name = get_device_for_syspath(partition_dir); 1337 if (dev_name == NULL) { 1338 g_debug("Failed to get device name for syspath: %s", 1339 disk_dir); 1340 continue; 1341 } 1342 partition = g_new0(GuestDiskInfo, 1); 1343 partition->name = dev_name; 1344 partition->partition = true; 1345 /* Add parent disk as dependent for easier tracking of hierarchy */ 1346 QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev)); 1347 1348 QAPI_LIST_PREPEND(ret, partition); 1349 } 1350 closedir(dp_disk); 1351 1352 return ret; 1353 } 1354 1355 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1356 { 1357 GuestDiskInfoList *ret = NULL; 1358 GuestDiskInfo *disk; 1359 DIR *dp = NULL; 1360 struct dirent *de = NULL; 1361 1362 g_debug("listing /sys/block directory"); 1363 dp = opendir("/sys/block"); 1364 if (dp == NULL) { 1365 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\""); 1366 return NULL; 1367 } 1368 while ((de = readdir(dp)) != NULL) { 1369 g_autofree char *disk_dir = NULL, *line = NULL, 1370 *size_path = NULL; 1371 char *dev_name; 1372 Error *local_err = NULL; 1373 if (de->d_type != DT_LNK) { 1374 g_debug(" skipping entry: %s", de->d_name); 1375 continue; 1376 } 1377 1378 /* Check size and skip zero-sized disks */ 1379 g_debug(" checking disk size"); 1380 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name); 1381 if (!g_file_get_contents(size_path, &line, NULL, NULL)) { 1382 g_debug(" failed to read disk size"); 1383 continue; 1384 } 1385 if (g_strcmp0(line, "0\n") == 0) { 1386 g_debug(" skipping zero-sized disk"); 1387 continue; 1388 } 1389 1390 g_debug(" adding %s", de->d_name); 1391 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name); 1392 dev_name = get_device_for_syspath(disk_dir); 1393 if (dev_name == NULL) { 1394 g_debug("Failed to get device name for syspath: %s", 1395 disk_dir); 1396 continue; 1397 } 1398 disk = g_new0(GuestDiskInfo, 1); 1399 disk->name = dev_name; 1400 disk->partition = false; 1401 disk->alias = get_alias_for_syspath(disk_dir); 1402 disk->has_alias = (disk->alias != NULL); 1403 QAPI_LIST_PREPEND(ret, disk); 1404 1405 /* Get address for non-virtual devices */ 1406 bool is_virtual = is_disk_virtual(disk_dir, &local_err); 1407 if (local_err != NULL) { 1408 g_debug(" failed to check disk path, ignoring error: %s", 1409 error_get_pretty(local_err)); 1410 error_free(local_err); 1411 local_err = NULL; 1412 /* Don't try to get the address */ 1413 is_virtual = true; 1414 } 1415 if (!is_virtual) { 1416 disk->address = get_disk_address(disk_dir, &local_err); 1417 if (local_err != NULL) { 1418 g_debug(" failed to get device info, ignoring error: %s", 1419 error_get_pretty(local_err)); 1420 error_free(local_err); 1421 local_err = NULL; 1422 } else if (disk->address != NULL) { 1423 disk->has_address = true; 1424 } 1425 } 1426 1427 get_disk_deps(disk_dir, disk); 1428 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); 1429 } 1430 1431 closedir(dp); 1432 1433 return ret; 1434 } 1435 1436 #else 1437 1438 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1439 { 1440 error_setg(errp, QERR_UNSUPPORTED); 1441 return NULL; 1442 } 1443 1444 #endif 1445 1446 /* Return a list of the disk device(s)' info which @mount lies on */ 1447 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1448 Error **errp) 1449 { 1450 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1451 struct statvfs buf; 1452 unsigned long used, nonroot_total, fr_size; 1453 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1454 mount->devmajor, mount->devminor); 1455 1456 fs->mountpoint = g_strdup(mount->dirname); 1457 fs->type = g_strdup(mount->devtype); 1458 build_guest_fsinfo_for_device(devpath, fs, errp); 1459 1460 if (statvfs(fs->mountpoint, &buf) == 0) { 1461 fr_size = buf.f_frsize; 1462 used = buf.f_blocks - buf.f_bfree; 1463 nonroot_total = used + buf.f_bavail; 1464 fs->used_bytes = used * fr_size; 1465 fs->total_bytes = nonroot_total * fr_size; 1466 1467 fs->has_total_bytes = true; 1468 fs->has_used_bytes = true; 1469 } 1470 1471 g_free(devpath); 1472 1473 return fs; 1474 } 1475 1476 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1477 { 1478 FsMountList mounts; 1479 struct FsMount *mount; 1480 GuestFilesystemInfoList *ret = NULL; 1481 Error *local_err = NULL; 1482 1483 QTAILQ_INIT(&mounts); 1484 build_fs_mount_list(&mounts, &local_err); 1485 if (local_err) { 1486 error_propagate(errp, local_err); 1487 return NULL; 1488 } 1489 1490 QTAILQ_FOREACH(mount, &mounts, next) { 1491 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1492 1493 QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err)); 1494 if (local_err) { 1495 error_propagate(errp, local_err); 1496 qapi_free_GuestFilesystemInfoList(ret); 1497 ret = NULL; 1498 break; 1499 } 1500 } 1501 1502 free_fs_mount_list(&mounts); 1503 return ret; 1504 } 1505 1506 1507 typedef enum { 1508 FSFREEZE_HOOK_THAW = 0, 1509 FSFREEZE_HOOK_FREEZE, 1510 } FsfreezeHookArg; 1511 1512 static const char *fsfreeze_hook_arg_string[] = { 1513 "thaw", 1514 "freeze", 1515 }; 1516 1517 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1518 { 1519 int status; 1520 pid_t pid; 1521 const char *hook; 1522 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1523 Error *local_err = NULL; 1524 1525 hook = ga_fsfreeze_hook(ga_state); 1526 if (!hook) { 1527 return; 1528 } 1529 if (access(hook, X_OK) != 0) { 1530 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1531 return; 1532 } 1533 1534 slog("executing fsfreeze hook with arg '%s'", arg_str); 1535 pid = fork(); 1536 if (pid == 0) { 1537 setsid(); 1538 reopen_fd_to_null(0); 1539 reopen_fd_to_null(1); 1540 reopen_fd_to_null(2); 1541 1542 execle(hook, hook, arg_str, NULL, environ); 1543 _exit(EXIT_FAILURE); 1544 } else if (pid < 0) { 1545 error_setg_errno(errp, errno, "failed to create child process"); 1546 return; 1547 } 1548 1549 ga_wait_child(pid, &status, &local_err); 1550 if (local_err) { 1551 error_propagate(errp, local_err); 1552 return; 1553 } 1554 1555 if (!WIFEXITED(status)) { 1556 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1557 return; 1558 } 1559 1560 status = WEXITSTATUS(status); 1561 if (status) { 1562 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1563 return; 1564 } 1565 } 1566 1567 /* 1568 * Return status of freeze/thaw 1569 */ 1570 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1571 { 1572 if (ga_is_frozen(ga_state)) { 1573 return GUEST_FSFREEZE_STATUS_FROZEN; 1574 } 1575 1576 return GUEST_FSFREEZE_STATUS_THAWED; 1577 } 1578 1579 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1580 { 1581 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1582 } 1583 1584 /* 1585 * Walk list of mounted file systems in the guest, and freeze the ones which 1586 * are real local file systems. 1587 */ 1588 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1589 strList *mountpoints, 1590 Error **errp) 1591 { 1592 int ret = 0, i = 0; 1593 strList *list; 1594 FsMountList mounts; 1595 struct FsMount *mount; 1596 Error *local_err = NULL; 1597 int fd; 1598 1599 slog("guest-fsfreeze called"); 1600 1601 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1602 if (local_err) { 1603 error_propagate(errp, local_err); 1604 return -1; 1605 } 1606 1607 QTAILQ_INIT(&mounts); 1608 build_fs_mount_list(&mounts, &local_err); 1609 if (local_err) { 1610 error_propagate(errp, local_err); 1611 return -1; 1612 } 1613 1614 /* cannot risk guest agent blocking itself on a write in this state */ 1615 ga_set_frozen(ga_state); 1616 1617 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1618 /* To issue fsfreeze in the reverse order of mounts, check if the 1619 * mount is listed in the list here */ 1620 if (has_mountpoints) { 1621 for (list = mountpoints; list; list = list->next) { 1622 if (strcmp(list->value, mount->dirname) == 0) { 1623 break; 1624 } 1625 } 1626 if (!list) { 1627 continue; 1628 } 1629 } 1630 1631 fd = qemu_open_old(mount->dirname, O_RDONLY); 1632 if (fd == -1) { 1633 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1634 goto error; 1635 } 1636 1637 /* we try to cull filesystems we know won't work in advance, but other 1638 * filesystems may not implement fsfreeze for less obvious reasons. 1639 * these will report EOPNOTSUPP. we simply ignore these when tallying 1640 * the number of frozen filesystems. 1641 * if a filesystem is mounted more than once (aka bind mount) a 1642 * consecutive attempt to freeze an already frozen filesystem will 1643 * return EBUSY. 1644 * 1645 * any other error means a failure to freeze a filesystem we 1646 * expect to be freezable, so return an error in those cases 1647 * and return system to thawed state. 1648 */ 1649 ret = ioctl(fd, FIFREEZE); 1650 if (ret == -1) { 1651 if (errno != EOPNOTSUPP && errno != EBUSY) { 1652 error_setg_errno(errp, errno, "failed to freeze %s", 1653 mount->dirname); 1654 close(fd); 1655 goto error; 1656 } 1657 } else { 1658 i++; 1659 } 1660 close(fd); 1661 } 1662 1663 free_fs_mount_list(&mounts); 1664 /* We may not issue any FIFREEZE here. 1665 * Just unset ga_state here and ready for the next call. 1666 */ 1667 if (i == 0) { 1668 ga_unset_frozen(ga_state); 1669 } 1670 return i; 1671 1672 error: 1673 free_fs_mount_list(&mounts); 1674 qmp_guest_fsfreeze_thaw(NULL); 1675 return 0; 1676 } 1677 1678 /* 1679 * Walk list of frozen file systems in the guest, and thaw them. 1680 */ 1681 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1682 { 1683 int ret; 1684 FsMountList mounts; 1685 FsMount *mount; 1686 int fd, i = 0, logged; 1687 Error *local_err = NULL; 1688 1689 QTAILQ_INIT(&mounts); 1690 build_fs_mount_list(&mounts, &local_err); 1691 if (local_err) { 1692 error_propagate(errp, local_err); 1693 return 0; 1694 } 1695 1696 QTAILQ_FOREACH(mount, &mounts, next) { 1697 logged = false; 1698 fd = qemu_open_old(mount->dirname, O_RDONLY); 1699 if (fd == -1) { 1700 continue; 1701 } 1702 /* we have no way of knowing whether a filesystem was actually unfrozen 1703 * as a result of a successful call to FITHAW, only that if an error 1704 * was returned the filesystem was *not* unfrozen by that particular 1705 * call. 1706 * 1707 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1708 * to unfreeze, continuing issuing FITHAW until an error is returned, 1709 * in which case either the filesystem is in an unfreezable state, or, 1710 * more likely, it was thawed previously (and remains so afterward). 1711 * 1712 * also, since the most recent successful call is the one that did 1713 * the actual unfreeze, we can use this to provide an accurate count 1714 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1715 * may * be useful for determining whether a filesystem was unfrozen 1716 * during the freeze/thaw phase by a process other than qemu-ga. 1717 */ 1718 do { 1719 ret = ioctl(fd, FITHAW); 1720 if (ret == 0 && !logged) { 1721 i++; 1722 logged = true; 1723 } 1724 } while (ret == 0); 1725 close(fd); 1726 } 1727 1728 ga_unset_frozen(ga_state); 1729 free_fs_mount_list(&mounts); 1730 1731 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1732 1733 return i; 1734 } 1735 1736 static void guest_fsfreeze_cleanup(void) 1737 { 1738 Error *err = NULL; 1739 1740 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1741 qmp_guest_fsfreeze_thaw(&err); 1742 if (err) { 1743 slog("failed to clean up frozen filesystems: %s", 1744 error_get_pretty(err)); 1745 error_free(err); 1746 } 1747 } 1748 } 1749 #endif /* CONFIG_FSFREEZE */ 1750 1751 #if defined(CONFIG_FSTRIM) 1752 /* 1753 * Walk list of mounted file systems in the guest, and trim them. 1754 */ 1755 GuestFilesystemTrimResponse * 1756 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1757 { 1758 GuestFilesystemTrimResponse *response; 1759 GuestFilesystemTrimResult *result; 1760 int ret = 0; 1761 FsMountList mounts; 1762 struct FsMount *mount; 1763 int fd; 1764 Error *local_err = NULL; 1765 struct fstrim_range r; 1766 1767 slog("guest-fstrim called"); 1768 1769 QTAILQ_INIT(&mounts); 1770 build_fs_mount_list(&mounts, &local_err); 1771 if (local_err) { 1772 error_propagate(errp, local_err); 1773 return NULL; 1774 } 1775 1776 response = g_malloc0(sizeof(*response)); 1777 1778 QTAILQ_FOREACH(mount, &mounts, next) { 1779 result = g_malloc0(sizeof(*result)); 1780 result->path = g_strdup(mount->dirname); 1781 1782 QAPI_LIST_PREPEND(response->paths, result); 1783 1784 fd = qemu_open_old(mount->dirname, O_RDONLY); 1785 if (fd == -1) { 1786 result->error = g_strdup_printf("failed to open: %s", 1787 strerror(errno)); 1788 result->has_error = true; 1789 continue; 1790 } 1791 1792 /* We try to cull filesystems we know won't work in advance, but other 1793 * filesystems may not implement fstrim for less obvious reasons. 1794 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1795 * will be reported (e.g. CD-ROMs). 1796 * Any other error means an unexpected error. 1797 */ 1798 r.start = 0; 1799 r.len = -1; 1800 r.minlen = has_minimum ? minimum : 0; 1801 ret = ioctl(fd, FITRIM, &r); 1802 if (ret == -1) { 1803 result->has_error = true; 1804 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1805 result->error = g_strdup("trim not supported"); 1806 } else { 1807 result->error = g_strdup_printf("failed to trim: %s", 1808 strerror(errno)); 1809 } 1810 close(fd); 1811 continue; 1812 } 1813 1814 result->has_minimum = true; 1815 result->minimum = r.minlen; 1816 result->has_trimmed = true; 1817 result->trimmed = r.len; 1818 close(fd); 1819 } 1820 1821 free_fs_mount_list(&mounts); 1822 return response; 1823 } 1824 #endif /* CONFIG_FSTRIM */ 1825 1826 1827 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1828 #define SUSPEND_SUPPORTED 0 1829 #define SUSPEND_NOT_SUPPORTED 1 1830 1831 typedef enum { 1832 SUSPEND_MODE_DISK = 0, 1833 SUSPEND_MODE_RAM = 1, 1834 SUSPEND_MODE_HYBRID = 2, 1835 } SuspendMode; 1836 1837 /* 1838 * Executes a command in a child process using g_spawn_sync, 1839 * returning an int >= 0 representing the exit status of the 1840 * process. 1841 * 1842 * If the program wasn't found in path, returns -1. 1843 * 1844 * If a problem happened when creating the child process, 1845 * returns -1 and errp is set. 1846 */ 1847 static int run_process_child(const char *command[], Error **errp) 1848 { 1849 int exit_status, spawn_flag; 1850 GError *g_err = NULL; 1851 bool success; 1852 1853 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1854 G_SPAWN_STDERR_TO_DEV_NULL; 1855 1856 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1857 NULL, NULL, NULL, NULL, 1858 &exit_status, &g_err); 1859 1860 if (success) { 1861 return WEXITSTATUS(exit_status); 1862 } 1863 1864 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1865 error_setg(errp, "failed to create child process, error '%s'", 1866 g_err->message); 1867 } 1868 1869 g_error_free(g_err); 1870 return -1; 1871 } 1872 1873 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1874 { 1875 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1876 "systemd-hybrid-sleep"}; 1877 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1878 int status; 1879 1880 status = run_process_child(cmd, errp); 1881 1882 /* 1883 * systemctl status uses LSB return codes so we can expect 1884 * status > 0 and be ok. To assert if the guest has support 1885 * for the selected suspend mode, status should be < 4. 4 is 1886 * the code for unknown service status, the return value when 1887 * the service does not exist. A common value is status = 3 1888 * (program is not running). 1889 */ 1890 if (status > 0 && status < 4) { 1891 return true; 1892 } 1893 1894 return false; 1895 } 1896 1897 static void systemd_suspend(SuspendMode mode, Error **errp) 1898 { 1899 Error *local_err = NULL; 1900 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1901 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1902 int status; 1903 1904 status = run_process_child(cmd, &local_err); 1905 1906 if (status == 0) { 1907 return; 1908 } 1909 1910 if ((status == -1) && !local_err) { 1911 error_setg(errp, "the helper program 'systemctl %s' was not found", 1912 systemctl_args[mode]); 1913 return; 1914 } 1915 1916 if (local_err) { 1917 error_propagate(errp, local_err); 1918 } else { 1919 error_setg(errp, "the helper program 'systemctl %s' returned an " 1920 "unexpected exit status code (%d)", 1921 systemctl_args[mode], status); 1922 } 1923 } 1924 1925 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1926 { 1927 Error *local_err = NULL; 1928 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1929 "--suspend-hybrid"}; 1930 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1931 int status; 1932 1933 status = run_process_child(cmd, &local_err); 1934 1935 if (status == SUSPEND_SUPPORTED) { 1936 return true; 1937 } 1938 1939 if ((status == -1) && !local_err) { 1940 return false; 1941 } 1942 1943 if (local_err) { 1944 error_propagate(errp, local_err); 1945 } else { 1946 error_setg(errp, 1947 "the helper program '%s' returned an unexpected exit" 1948 " status code (%d)", "pm-is-supported", status); 1949 } 1950 1951 return false; 1952 } 1953 1954 static void pmutils_suspend(SuspendMode mode, Error **errp) 1955 { 1956 Error *local_err = NULL; 1957 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1958 "pm-suspend-hybrid"}; 1959 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1960 int status; 1961 1962 status = run_process_child(cmd, &local_err); 1963 1964 if (status == 0) { 1965 return; 1966 } 1967 1968 if ((status == -1) && !local_err) { 1969 error_setg(errp, "the helper program '%s' was not found", 1970 pmutils_binaries[mode]); 1971 return; 1972 } 1973 1974 if (local_err) { 1975 error_propagate(errp, local_err); 1976 } else { 1977 error_setg(errp, 1978 "the helper program '%s' returned an unexpected exit" 1979 " status code (%d)", pmutils_binaries[mode], status); 1980 } 1981 } 1982 1983 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 1984 { 1985 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 1986 const char *sysfile_str = sysfile_strs[mode]; 1987 char buf[32]; /* hopefully big enough */ 1988 int fd; 1989 ssize_t ret; 1990 1991 if (!sysfile_str) { 1992 error_setg(errp, "unknown guest suspend mode"); 1993 return false; 1994 } 1995 1996 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 1997 if (fd < 0) { 1998 return false; 1999 } 2000 2001 ret = read(fd, buf, sizeof(buf) - 1); 2002 close(fd); 2003 if (ret <= 0) { 2004 return false; 2005 } 2006 buf[ret] = '\0'; 2007 2008 if (strstr(buf, sysfile_str)) { 2009 return true; 2010 } 2011 return false; 2012 } 2013 2014 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 2015 { 2016 Error *local_err = NULL; 2017 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2018 const char *sysfile_str = sysfile_strs[mode]; 2019 pid_t pid; 2020 int status; 2021 2022 if (!sysfile_str) { 2023 error_setg(errp, "unknown guest suspend mode"); 2024 return; 2025 } 2026 2027 pid = fork(); 2028 if (!pid) { 2029 /* child */ 2030 int fd; 2031 2032 setsid(); 2033 reopen_fd_to_null(0); 2034 reopen_fd_to_null(1); 2035 reopen_fd_to_null(2); 2036 2037 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 2038 if (fd < 0) { 2039 _exit(EXIT_FAILURE); 2040 } 2041 2042 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 2043 _exit(EXIT_FAILURE); 2044 } 2045 2046 _exit(EXIT_SUCCESS); 2047 } else if (pid < 0) { 2048 error_setg_errno(errp, errno, "failed to create child process"); 2049 return; 2050 } 2051 2052 ga_wait_child(pid, &status, &local_err); 2053 if (local_err) { 2054 error_propagate(errp, local_err); 2055 return; 2056 } 2057 2058 if (WEXITSTATUS(status)) { 2059 error_setg(errp, "child process has failed to suspend"); 2060 } 2061 2062 } 2063 2064 static void guest_suspend(SuspendMode mode, Error **errp) 2065 { 2066 Error *local_err = NULL; 2067 bool mode_supported = false; 2068 2069 if (systemd_supports_mode(mode, &local_err)) { 2070 mode_supported = true; 2071 systemd_suspend(mode, &local_err); 2072 } 2073 2074 if (!local_err) { 2075 return; 2076 } 2077 2078 error_free(local_err); 2079 local_err = NULL; 2080 2081 if (pmutils_supports_mode(mode, &local_err)) { 2082 mode_supported = true; 2083 pmutils_suspend(mode, &local_err); 2084 } 2085 2086 if (!local_err) { 2087 return; 2088 } 2089 2090 error_free(local_err); 2091 local_err = NULL; 2092 2093 if (linux_sys_state_supports_mode(mode, &local_err)) { 2094 mode_supported = true; 2095 linux_sys_state_suspend(mode, &local_err); 2096 } 2097 2098 if (!mode_supported) { 2099 error_free(local_err); 2100 error_setg(errp, 2101 "the requested suspend mode is not supported by the guest"); 2102 } else { 2103 error_propagate(errp, local_err); 2104 } 2105 } 2106 2107 void qmp_guest_suspend_disk(Error **errp) 2108 { 2109 guest_suspend(SUSPEND_MODE_DISK, errp); 2110 } 2111 2112 void qmp_guest_suspend_ram(Error **errp) 2113 { 2114 guest_suspend(SUSPEND_MODE_RAM, errp); 2115 } 2116 2117 void qmp_guest_suspend_hybrid(Error **errp) 2118 { 2119 guest_suspend(SUSPEND_MODE_HYBRID, errp); 2120 } 2121 2122 static GuestNetworkInterfaceList * 2123 guest_find_interface(GuestNetworkInterfaceList *head, 2124 const char *name) 2125 { 2126 for (; head; head = head->next) { 2127 if (strcmp(head->value->name, name) == 0) { 2128 break; 2129 } 2130 } 2131 2132 return head; 2133 } 2134 2135 static int guest_get_network_stats(const char *name, 2136 GuestNetworkInterfaceStat *stats) 2137 { 2138 int name_len; 2139 char const *devinfo = "/proc/net/dev"; 2140 FILE *fp; 2141 char *line = NULL, *colon; 2142 size_t n = 0; 2143 fp = fopen(devinfo, "r"); 2144 if (!fp) { 2145 return -1; 2146 } 2147 name_len = strlen(name); 2148 while (getline(&line, &n, fp) != -1) { 2149 long long dummy; 2150 long long rx_bytes; 2151 long long rx_packets; 2152 long long rx_errs; 2153 long long rx_dropped; 2154 long long tx_bytes; 2155 long long tx_packets; 2156 long long tx_errs; 2157 long long tx_dropped; 2158 char *trim_line; 2159 trim_line = g_strchug(line); 2160 if (trim_line[0] == '\0') { 2161 continue; 2162 } 2163 colon = strchr(trim_line, ':'); 2164 if (!colon) { 2165 continue; 2166 } 2167 if (colon - name_len == trim_line && 2168 strncmp(trim_line, name, name_len) == 0) { 2169 if (sscanf(colon + 1, 2170 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 2171 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 2172 &dummy, &dummy, &dummy, &dummy, 2173 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 2174 &dummy, &dummy, &dummy, &dummy) != 16) { 2175 continue; 2176 } 2177 stats->rx_bytes = rx_bytes; 2178 stats->rx_packets = rx_packets; 2179 stats->rx_errs = rx_errs; 2180 stats->rx_dropped = rx_dropped; 2181 stats->tx_bytes = tx_bytes; 2182 stats->tx_packets = tx_packets; 2183 stats->tx_errs = tx_errs; 2184 stats->tx_dropped = tx_dropped; 2185 fclose(fp); 2186 g_free(line); 2187 return 0; 2188 } 2189 } 2190 fclose(fp); 2191 g_free(line); 2192 g_debug("/proc/net/dev: Interface '%s' not found", name); 2193 return -1; 2194 } 2195 2196 /* 2197 * Build information about guest interfaces 2198 */ 2199 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2200 { 2201 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 2202 struct ifaddrs *ifap, *ifa; 2203 2204 if (getifaddrs(&ifap) < 0) { 2205 error_setg_errno(errp, errno, "getifaddrs failed"); 2206 goto error; 2207 } 2208 2209 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2210 GuestNetworkInterfaceList *info; 2211 GuestIpAddressList **address_list = NULL, *address_item = NULL; 2212 GuestNetworkInterfaceStat *interface_stat = NULL; 2213 char addr4[INET_ADDRSTRLEN]; 2214 char addr6[INET6_ADDRSTRLEN]; 2215 int sock; 2216 struct ifreq ifr; 2217 unsigned char *mac_addr; 2218 void *p; 2219 2220 g_debug("Processing %s interface", ifa->ifa_name); 2221 2222 info = guest_find_interface(head, ifa->ifa_name); 2223 2224 if (!info) { 2225 info = g_malloc0(sizeof(*info)); 2226 info->value = g_malloc0(sizeof(*info->value)); 2227 info->value->name = g_strdup(ifa->ifa_name); 2228 2229 if (!cur_item) { 2230 head = cur_item = info; 2231 } else { 2232 cur_item->next = info; 2233 cur_item = info; 2234 } 2235 } 2236 2237 if (!info->value->has_hardware_address && 2238 ifa->ifa_flags & SIOCGIFHWADDR) { 2239 /* we haven't obtained HW address yet */ 2240 sock = socket(PF_INET, SOCK_STREAM, 0); 2241 if (sock == -1) { 2242 error_setg_errno(errp, errno, "failed to create socket"); 2243 goto error; 2244 } 2245 2246 memset(&ifr, 0, sizeof(ifr)); 2247 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 2248 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 2249 error_setg_errno(errp, errno, 2250 "failed to get MAC address of %s", 2251 ifa->ifa_name); 2252 close(sock); 2253 goto error; 2254 } 2255 2256 close(sock); 2257 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 2258 2259 info->value->hardware_address = 2260 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2261 (int) mac_addr[0], (int) mac_addr[1], 2262 (int) mac_addr[2], (int) mac_addr[3], 2263 (int) mac_addr[4], (int) mac_addr[5]); 2264 2265 info->value->has_hardware_address = true; 2266 } 2267 2268 if (ifa->ifa_addr && 2269 ifa->ifa_addr->sa_family == AF_INET) { 2270 /* interface with IPv4 address */ 2271 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2272 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2273 error_setg_errno(errp, errno, "inet_ntop failed"); 2274 goto error; 2275 } 2276 2277 address_item = g_malloc0(sizeof(*address_item)); 2278 address_item->value = g_malloc0(sizeof(*address_item->value)); 2279 address_item->value->ip_address = g_strdup(addr4); 2280 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2281 2282 if (ifa->ifa_netmask) { 2283 /* Count the number of set bits in netmask. 2284 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2285 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2286 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 2287 } 2288 } else if (ifa->ifa_addr && 2289 ifa->ifa_addr->sa_family == AF_INET6) { 2290 /* interface with IPv6 address */ 2291 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2292 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2293 error_setg_errno(errp, errno, "inet_ntop failed"); 2294 goto error; 2295 } 2296 2297 address_item = g_malloc0(sizeof(*address_item)); 2298 address_item->value = g_malloc0(sizeof(*address_item->value)); 2299 address_item->value->ip_address = g_strdup(addr6); 2300 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2301 2302 if (ifa->ifa_netmask) { 2303 /* Count the number of set bits in netmask. 2304 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2305 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2306 address_item->value->prefix = 2307 ctpop32(((uint32_t *) p)[0]) + 2308 ctpop32(((uint32_t *) p)[1]) + 2309 ctpop32(((uint32_t *) p)[2]) + 2310 ctpop32(((uint32_t *) p)[3]); 2311 } 2312 } 2313 2314 if (!address_item) { 2315 continue; 2316 } 2317 2318 address_list = &info->value->ip_addresses; 2319 2320 while (*address_list && (*address_list)->next) { 2321 address_list = &(*address_list)->next; 2322 } 2323 2324 if (!*address_list) { 2325 *address_list = address_item; 2326 } else { 2327 (*address_list)->next = address_item; 2328 } 2329 2330 info->value->has_ip_addresses = true; 2331 2332 if (!info->value->has_statistics) { 2333 interface_stat = g_malloc0(sizeof(*interface_stat)); 2334 if (guest_get_network_stats(info->value->name, 2335 interface_stat) == -1) { 2336 info->value->has_statistics = false; 2337 g_free(interface_stat); 2338 } else { 2339 info->value->statistics = interface_stat; 2340 info->value->has_statistics = true; 2341 } 2342 } 2343 } 2344 2345 freeifaddrs(ifap); 2346 return head; 2347 2348 error: 2349 freeifaddrs(ifap); 2350 qapi_free_GuestNetworkInterfaceList(head); 2351 return NULL; 2352 } 2353 2354 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 2355 2356 static long sysconf_exact(int name, const char *name_str, Error **errp) 2357 { 2358 long ret; 2359 2360 errno = 0; 2361 ret = sysconf(name); 2362 if (ret == -1) { 2363 if (errno == 0) { 2364 error_setg(errp, "sysconf(%s): value indefinite", name_str); 2365 } else { 2366 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 2367 } 2368 } 2369 return ret; 2370 } 2371 2372 /* Transfer online/offline status between @vcpu and the guest system. 2373 * 2374 * On input either @errp or *@errp must be NULL. 2375 * 2376 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2377 * - R: vcpu->logical_id 2378 * - W: vcpu->online 2379 * - W: vcpu->can_offline 2380 * 2381 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2382 * - R: vcpu->logical_id 2383 * - R: vcpu->online 2384 * 2385 * Written members remain unmodified on error. 2386 */ 2387 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2388 char *dirpath, Error **errp) 2389 { 2390 int fd; 2391 int res; 2392 int dirfd; 2393 static const char fn[] = "online"; 2394 2395 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2396 if (dirfd == -1) { 2397 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2398 return; 2399 } 2400 2401 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2402 if (fd == -1) { 2403 if (errno != ENOENT) { 2404 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2405 } else if (sys2vcpu) { 2406 vcpu->online = true; 2407 vcpu->can_offline = false; 2408 } else if (!vcpu->online) { 2409 error_setg(errp, "logical processor #%" PRId64 " can't be " 2410 "offlined", vcpu->logical_id); 2411 } /* otherwise pretend successful re-onlining */ 2412 } else { 2413 unsigned char status; 2414 2415 res = pread(fd, &status, 1, 0); 2416 if (res == -1) { 2417 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2418 } else if (res == 0) { 2419 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2420 fn); 2421 } else if (sys2vcpu) { 2422 vcpu->online = (status != '0'); 2423 vcpu->can_offline = true; 2424 } else if (vcpu->online != (status != '0')) { 2425 status = '0' + vcpu->online; 2426 if (pwrite(fd, &status, 1, 0) == -1) { 2427 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2428 fn); 2429 } 2430 } /* otherwise pretend successful re-(on|off)-lining */ 2431 2432 res = close(fd); 2433 g_assert(res == 0); 2434 } 2435 2436 res = close(dirfd); 2437 g_assert(res == 0); 2438 } 2439 2440 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2441 { 2442 int64_t current; 2443 GuestLogicalProcessorList *head, **link; 2444 long sc_max; 2445 Error *local_err = NULL; 2446 2447 current = 0; 2448 head = NULL; 2449 link = &head; 2450 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 2451 2452 while (local_err == NULL && current < sc_max) { 2453 GuestLogicalProcessor *vcpu; 2454 GuestLogicalProcessorList *entry; 2455 int64_t id = current++; 2456 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2457 id); 2458 2459 if (g_file_test(path, G_FILE_TEST_EXISTS)) { 2460 vcpu = g_malloc0(sizeof *vcpu); 2461 vcpu->logical_id = id; 2462 vcpu->has_can_offline = true; /* lolspeak ftw */ 2463 transfer_vcpu(vcpu, true, path, &local_err); 2464 entry = g_malloc0(sizeof *entry); 2465 entry->value = vcpu; 2466 *link = entry; 2467 link = &entry->next; 2468 } 2469 g_free(path); 2470 } 2471 2472 if (local_err == NULL) { 2473 /* there's no guest with zero VCPUs */ 2474 g_assert(head != NULL); 2475 return head; 2476 } 2477 2478 qapi_free_GuestLogicalProcessorList(head); 2479 error_propagate(errp, local_err); 2480 return NULL; 2481 } 2482 2483 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2484 { 2485 int64_t processed; 2486 Error *local_err = NULL; 2487 2488 processed = 0; 2489 while (vcpus != NULL) { 2490 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2491 vcpus->value->logical_id); 2492 2493 transfer_vcpu(vcpus->value, false, path, &local_err); 2494 g_free(path); 2495 if (local_err != NULL) { 2496 break; 2497 } 2498 ++processed; 2499 vcpus = vcpus->next; 2500 } 2501 2502 if (local_err != NULL) { 2503 if (processed == 0) { 2504 error_propagate(errp, local_err); 2505 } else { 2506 error_free(local_err); 2507 } 2508 } 2509 2510 return processed; 2511 } 2512 2513 void qmp_guest_set_user_password(const char *username, 2514 const char *password, 2515 bool crypted, 2516 Error **errp) 2517 { 2518 Error *local_err = NULL; 2519 char *passwd_path = NULL; 2520 pid_t pid; 2521 int status; 2522 int datafd[2] = { -1, -1 }; 2523 char *rawpasswddata = NULL; 2524 size_t rawpasswdlen; 2525 char *chpasswddata = NULL; 2526 size_t chpasswdlen; 2527 2528 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 2529 if (!rawpasswddata) { 2530 return; 2531 } 2532 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 2533 rawpasswddata[rawpasswdlen] = '\0'; 2534 2535 if (strchr(rawpasswddata, '\n')) { 2536 error_setg(errp, "forbidden characters in raw password"); 2537 goto out; 2538 } 2539 2540 if (strchr(username, '\n') || 2541 strchr(username, ':')) { 2542 error_setg(errp, "forbidden characters in username"); 2543 goto out; 2544 } 2545 2546 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 2547 chpasswdlen = strlen(chpasswddata); 2548 2549 passwd_path = g_find_program_in_path("chpasswd"); 2550 2551 if (!passwd_path) { 2552 error_setg(errp, "cannot find 'passwd' program in PATH"); 2553 goto out; 2554 } 2555 2556 if (pipe(datafd) < 0) { 2557 error_setg(errp, "cannot create pipe FDs"); 2558 goto out; 2559 } 2560 2561 pid = fork(); 2562 if (pid == 0) { 2563 close(datafd[1]); 2564 /* child */ 2565 setsid(); 2566 dup2(datafd[0], 0); 2567 reopen_fd_to_null(1); 2568 reopen_fd_to_null(2); 2569 2570 if (crypted) { 2571 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2572 } else { 2573 execle(passwd_path, "chpasswd", NULL, environ); 2574 } 2575 _exit(EXIT_FAILURE); 2576 } else if (pid < 0) { 2577 error_setg_errno(errp, errno, "failed to create child process"); 2578 goto out; 2579 } 2580 close(datafd[0]); 2581 datafd[0] = -1; 2582 2583 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2584 error_setg_errno(errp, errno, "cannot write new account password"); 2585 goto out; 2586 } 2587 close(datafd[1]); 2588 datafd[1] = -1; 2589 2590 ga_wait_child(pid, &status, &local_err); 2591 if (local_err) { 2592 error_propagate(errp, local_err); 2593 goto out; 2594 } 2595 2596 if (!WIFEXITED(status)) { 2597 error_setg(errp, "child process has terminated abnormally"); 2598 goto out; 2599 } 2600 2601 if (WEXITSTATUS(status)) { 2602 error_setg(errp, "child process has failed to set user password"); 2603 goto out; 2604 } 2605 2606 out: 2607 g_free(chpasswddata); 2608 g_free(rawpasswddata); 2609 g_free(passwd_path); 2610 if (datafd[0] != -1) { 2611 close(datafd[0]); 2612 } 2613 if (datafd[1] != -1) { 2614 close(datafd[1]); 2615 } 2616 } 2617 2618 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2619 int size, Error **errp) 2620 { 2621 int fd; 2622 int res; 2623 2624 errno = 0; 2625 fd = openat(dirfd, pathname, O_RDONLY); 2626 if (fd == -1) { 2627 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2628 return; 2629 } 2630 2631 res = pread(fd, buf, size, 0); 2632 if (res == -1) { 2633 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2634 } else if (res == 0) { 2635 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2636 } 2637 close(fd); 2638 } 2639 2640 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2641 const char *buf, int size, Error **errp) 2642 { 2643 int fd; 2644 2645 errno = 0; 2646 fd = openat(dirfd, pathname, O_WRONLY); 2647 if (fd == -1) { 2648 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2649 return; 2650 } 2651 2652 if (pwrite(fd, buf, size, 0) == -1) { 2653 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2654 } 2655 2656 close(fd); 2657 } 2658 2659 /* Transfer online/offline status between @mem_blk and the guest system. 2660 * 2661 * On input either @errp or *@errp must be NULL. 2662 * 2663 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2664 * - R: mem_blk->phys_index 2665 * - W: mem_blk->online 2666 * - W: mem_blk->can_offline 2667 * 2668 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2669 * - R: mem_blk->phys_index 2670 * - R: mem_blk->online 2671 *- R: mem_blk->can_offline 2672 * Written members remain unmodified on error. 2673 */ 2674 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2675 GuestMemoryBlockResponse *result, 2676 Error **errp) 2677 { 2678 char *dirpath; 2679 int dirfd; 2680 char *status; 2681 Error *local_err = NULL; 2682 2683 if (!sys2memblk) { 2684 DIR *dp; 2685 2686 if (!result) { 2687 error_setg(errp, "Internal error, 'result' should not be NULL"); 2688 return; 2689 } 2690 errno = 0; 2691 dp = opendir("/sys/devices/system/memory/"); 2692 /* if there is no 'memory' directory in sysfs, 2693 * we think this VM does not support online/offline memory block, 2694 * any other solution? 2695 */ 2696 if (!dp) { 2697 if (errno == ENOENT) { 2698 result->response = 2699 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2700 } 2701 goto out1; 2702 } 2703 closedir(dp); 2704 } 2705 2706 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2707 mem_blk->phys_index); 2708 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2709 if (dirfd == -1) { 2710 if (sys2memblk) { 2711 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2712 } else { 2713 if (errno == ENOENT) { 2714 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2715 } else { 2716 result->response = 2717 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2718 } 2719 } 2720 g_free(dirpath); 2721 goto out1; 2722 } 2723 g_free(dirpath); 2724 2725 status = g_malloc0(10); 2726 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2727 if (local_err) { 2728 /* treat with sysfs file that not exist in old kernel */ 2729 if (errno == ENOENT) { 2730 error_free(local_err); 2731 if (sys2memblk) { 2732 mem_blk->online = true; 2733 mem_blk->can_offline = false; 2734 } else if (!mem_blk->online) { 2735 result->response = 2736 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2737 } 2738 } else { 2739 if (sys2memblk) { 2740 error_propagate(errp, local_err); 2741 } else { 2742 error_free(local_err); 2743 result->response = 2744 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2745 } 2746 } 2747 goto out2; 2748 } 2749 2750 if (sys2memblk) { 2751 char removable = '0'; 2752 2753 mem_blk->online = (strncmp(status, "online", 6) == 0); 2754 2755 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2756 if (local_err) { 2757 /* if no 'removable' file, it doesn't support offline mem blk */ 2758 if (errno == ENOENT) { 2759 error_free(local_err); 2760 mem_blk->can_offline = false; 2761 } else { 2762 error_propagate(errp, local_err); 2763 } 2764 } else { 2765 mem_blk->can_offline = (removable != '0'); 2766 } 2767 } else { 2768 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2769 const char *new_state = mem_blk->online ? "online" : "offline"; 2770 2771 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2772 &local_err); 2773 if (local_err) { 2774 error_free(local_err); 2775 result->response = 2776 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2777 goto out2; 2778 } 2779 2780 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2781 result->has_error_code = false; 2782 } /* otherwise pretend successful re-(on|off)-lining */ 2783 } 2784 g_free(status); 2785 close(dirfd); 2786 return; 2787 2788 out2: 2789 g_free(status); 2790 close(dirfd); 2791 out1: 2792 if (!sys2memblk) { 2793 result->has_error_code = true; 2794 result->error_code = errno; 2795 } 2796 } 2797 2798 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2799 { 2800 GuestMemoryBlockList *head, **link; 2801 Error *local_err = NULL; 2802 struct dirent *de; 2803 DIR *dp; 2804 2805 head = NULL; 2806 link = &head; 2807 2808 dp = opendir("/sys/devices/system/memory/"); 2809 if (!dp) { 2810 /* it's ok if this happens to be a system that doesn't expose 2811 * memory blocks via sysfs, but otherwise we should report 2812 * an error 2813 */ 2814 if (errno != ENOENT) { 2815 error_setg_errno(errp, errno, "Can't open directory" 2816 "\"/sys/devices/system/memory/\""); 2817 } 2818 return NULL; 2819 } 2820 2821 /* Note: the phys_index of memory block may be discontinuous, 2822 * this is because a memblk is the unit of the Sparse Memory design, which 2823 * allows discontinuous memory ranges (ex. NUMA), so here we should 2824 * traverse the memory block directory. 2825 */ 2826 while ((de = readdir(dp)) != NULL) { 2827 GuestMemoryBlock *mem_blk; 2828 GuestMemoryBlockList *entry; 2829 2830 if ((strncmp(de->d_name, "memory", 6) != 0) || 2831 !(de->d_type & DT_DIR)) { 2832 continue; 2833 } 2834 2835 mem_blk = g_malloc0(sizeof *mem_blk); 2836 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2837 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2838 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2839 transfer_memory_block(mem_blk, true, NULL, &local_err); 2840 if (local_err) { 2841 break; 2842 } 2843 2844 entry = g_malloc0(sizeof *entry); 2845 entry->value = mem_blk; 2846 2847 *link = entry; 2848 link = &entry->next; 2849 } 2850 2851 closedir(dp); 2852 if (local_err == NULL) { 2853 /* there's no guest with zero memory blocks */ 2854 if (head == NULL) { 2855 error_setg(errp, "guest reported zero memory blocks!"); 2856 } 2857 return head; 2858 } 2859 2860 qapi_free_GuestMemoryBlockList(head); 2861 error_propagate(errp, local_err); 2862 return NULL; 2863 } 2864 2865 GuestMemoryBlockResponseList * 2866 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2867 { 2868 GuestMemoryBlockResponseList *head, **link; 2869 Error *local_err = NULL; 2870 2871 head = NULL; 2872 link = &head; 2873 2874 while (mem_blks != NULL) { 2875 GuestMemoryBlockResponse *result; 2876 GuestMemoryBlockResponseList *entry; 2877 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2878 2879 result = g_malloc0(sizeof(*result)); 2880 result->phys_index = current_mem_blk->phys_index; 2881 transfer_memory_block(current_mem_blk, false, result, &local_err); 2882 if (local_err) { /* should never happen */ 2883 goto err; 2884 } 2885 entry = g_malloc0(sizeof *entry); 2886 entry->value = result; 2887 2888 *link = entry; 2889 link = &entry->next; 2890 mem_blks = mem_blks->next; 2891 } 2892 2893 return head; 2894 err: 2895 qapi_free_GuestMemoryBlockResponseList(head); 2896 error_propagate(errp, local_err); 2897 return NULL; 2898 } 2899 2900 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2901 { 2902 Error *local_err = NULL; 2903 char *dirpath; 2904 int dirfd; 2905 char *buf; 2906 GuestMemoryBlockInfo *info; 2907 2908 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2909 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2910 if (dirfd == -1) { 2911 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2912 g_free(dirpath); 2913 return NULL; 2914 } 2915 g_free(dirpath); 2916 2917 buf = g_malloc0(20); 2918 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2919 close(dirfd); 2920 if (local_err) { 2921 g_free(buf); 2922 error_propagate(errp, local_err); 2923 return NULL; 2924 } 2925 2926 info = g_new0(GuestMemoryBlockInfo, 1); 2927 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2928 2929 g_free(buf); 2930 2931 return info; 2932 } 2933 2934 #else /* defined(__linux__) */ 2935 2936 void qmp_guest_suspend_disk(Error **errp) 2937 { 2938 error_setg(errp, QERR_UNSUPPORTED); 2939 } 2940 2941 void qmp_guest_suspend_ram(Error **errp) 2942 { 2943 error_setg(errp, QERR_UNSUPPORTED); 2944 } 2945 2946 void qmp_guest_suspend_hybrid(Error **errp) 2947 { 2948 error_setg(errp, QERR_UNSUPPORTED); 2949 } 2950 2951 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2952 { 2953 error_setg(errp, QERR_UNSUPPORTED); 2954 return NULL; 2955 } 2956 2957 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2958 { 2959 error_setg(errp, QERR_UNSUPPORTED); 2960 return NULL; 2961 } 2962 2963 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2964 { 2965 error_setg(errp, QERR_UNSUPPORTED); 2966 return -1; 2967 } 2968 2969 void qmp_guest_set_user_password(const char *username, 2970 const char *password, 2971 bool crypted, 2972 Error **errp) 2973 { 2974 error_setg(errp, QERR_UNSUPPORTED); 2975 } 2976 2977 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2978 { 2979 error_setg(errp, QERR_UNSUPPORTED); 2980 return NULL; 2981 } 2982 2983 GuestMemoryBlockResponseList * 2984 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2985 { 2986 error_setg(errp, QERR_UNSUPPORTED); 2987 return NULL; 2988 } 2989 2990 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2991 { 2992 error_setg(errp, QERR_UNSUPPORTED); 2993 return NULL; 2994 } 2995 2996 #endif 2997 2998 #if !defined(CONFIG_FSFREEZE) 2999 3000 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 3001 { 3002 error_setg(errp, QERR_UNSUPPORTED); 3003 return NULL; 3004 } 3005 3006 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 3007 { 3008 error_setg(errp, QERR_UNSUPPORTED); 3009 3010 return 0; 3011 } 3012 3013 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 3014 { 3015 error_setg(errp, QERR_UNSUPPORTED); 3016 3017 return 0; 3018 } 3019 3020 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 3021 strList *mountpoints, 3022 Error **errp) 3023 { 3024 error_setg(errp, QERR_UNSUPPORTED); 3025 3026 return 0; 3027 } 3028 3029 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 3030 { 3031 error_setg(errp, QERR_UNSUPPORTED); 3032 3033 return 0; 3034 } 3035 3036 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 3037 { 3038 error_setg(errp, QERR_UNSUPPORTED); 3039 return NULL; 3040 } 3041 3042 #endif /* CONFIG_FSFREEZE */ 3043 3044 #if !defined(CONFIG_FSTRIM) 3045 GuestFilesystemTrimResponse * 3046 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 3047 { 3048 error_setg(errp, QERR_UNSUPPORTED); 3049 return NULL; 3050 } 3051 #endif 3052 3053 /* add unsupported commands to the blacklist */ 3054 GList *ga_command_blacklist_init(GList *blacklist) 3055 { 3056 #if !defined(__linux__) 3057 { 3058 const char *list[] = { 3059 "guest-suspend-disk", "guest-suspend-ram", 3060 "guest-suspend-hybrid", "guest-network-get-interfaces", 3061 "guest-get-vcpus", "guest-set-vcpus", 3062 "guest-get-memory-blocks", "guest-set-memory-blocks", 3063 "guest-get-memory-block-size", "guest-get-memory-block-info", 3064 NULL}; 3065 char **p = (char **)list; 3066 3067 while (*p) { 3068 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3069 } 3070 } 3071 #endif 3072 3073 #if !defined(CONFIG_FSFREEZE) 3074 { 3075 const char *list[] = { 3076 "guest-get-fsinfo", "guest-fsfreeze-status", 3077 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 3078 "guest-fsfreeze-thaw", "guest-get-fsinfo", 3079 "guest-get-disks", NULL}; 3080 char **p = (char **)list; 3081 3082 while (*p) { 3083 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3084 } 3085 } 3086 #endif 3087 3088 #if !defined(CONFIG_FSTRIM) 3089 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 3090 #endif 3091 3092 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 3093 3094 return blacklist; 3095 } 3096 3097 /* register init/cleanup routines for stateful command groups */ 3098 void ga_command_state_init(GAState *s, GACommandState *cs) 3099 { 3100 #if defined(CONFIG_FSFREEZE) 3101 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 3102 #endif 3103 } 3104 3105 #ifdef HAVE_UTMPX 3106 3107 #define QGA_MICRO_SECOND_TO_SECOND 1000000 3108 3109 static double ga_get_login_time(struct utmpx *user_info) 3110 { 3111 double seconds = (double)user_info->ut_tv.tv_sec; 3112 double useconds = (double)user_info->ut_tv.tv_usec; 3113 useconds /= QGA_MICRO_SECOND_TO_SECOND; 3114 return seconds + useconds; 3115 } 3116 3117 GuestUserList *qmp_guest_get_users(Error **errp) 3118 { 3119 GHashTable *cache = NULL; 3120 GuestUserList *head = NULL, *cur_item = NULL; 3121 struct utmpx *user_info = NULL; 3122 gpointer value = NULL; 3123 GuestUser *user = NULL; 3124 GuestUserList *item = NULL; 3125 double login_time = 0; 3126 3127 cache = g_hash_table_new(g_str_hash, g_str_equal); 3128 setutxent(); 3129 3130 for (;;) { 3131 user_info = getutxent(); 3132 if (user_info == NULL) { 3133 break; 3134 } else if (user_info->ut_type != USER_PROCESS) { 3135 continue; 3136 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 3137 value = g_hash_table_lookup(cache, user_info->ut_user); 3138 user = (GuestUser *)value; 3139 login_time = ga_get_login_time(user_info); 3140 /* We're ensuring the earliest login time to be sent */ 3141 if (login_time < user->login_time) { 3142 user->login_time = login_time; 3143 } 3144 continue; 3145 } 3146 3147 item = g_new0(GuestUserList, 1); 3148 item->value = g_new0(GuestUser, 1); 3149 item->value->user = g_strdup(user_info->ut_user); 3150 item->value->login_time = ga_get_login_time(user_info); 3151 3152 g_hash_table_insert(cache, item->value->user, item->value); 3153 3154 if (!cur_item) { 3155 head = cur_item = item; 3156 } else { 3157 cur_item->next = item; 3158 cur_item = item; 3159 } 3160 } 3161 endutxent(); 3162 g_hash_table_destroy(cache); 3163 return head; 3164 } 3165 3166 #else 3167 3168 GuestUserList *qmp_guest_get_users(Error **errp) 3169 { 3170 error_setg(errp, QERR_UNSUPPORTED); 3171 return NULL; 3172 } 3173 3174 #endif 3175 3176 /* Replace escaped special characters with theire real values. The replacement 3177 * is done in place -- returned value is in the original string. 3178 */ 3179 static void ga_osrelease_replace_special(gchar *value) 3180 { 3181 gchar *p, *p2, quote; 3182 3183 /* Trim the string at first space or semicolon if it is not enclosed in 3184 * single or double quotes. */ 3185 if ((value[0] != '"') || (value[0] == '\'')) { 3186 p = strchr(value, ' '); 3187 if (p != NULL) { 3188 *p = 0; 3189 } 3190 p = strchr(value, ';'); 3191 if (p != NULL) { 3192 *p = 0; 3193 } 3194 return; 3195 } 3196 3197 quote = value[0]; 3198 p2 = value; 3199 p = value + 1; 3200 while (*p != 0) { 3201 if (*p == '\\') { 3202 p++; 3203 switch (*p) { 3204 case '$': 3205 case '\'': 3206 case '"': 3207 case '\\': 3208 case '`': 3209 break; 3210 default: 3211 /* Keep literal backslash followed by whatever is there */ 3212 p--; 3213 break; 3214 } 3215 } else if (*p == quote) { 3216 *p2 = 0; 3217 break; 3218 } 3219 *(p2++) = *(p++); 3220 } 3221 } 3222 3223 static GKeyFile *ga_parse_osrelease(const char *fname) 3224 { 3225 gchar *content = NULL; 3226 gchar *content2 = NULL; 3227 GError *err = NULL; 3228 GKeyFile *keys = g_key_file_new(); 3229 const char *group = "[os-release]\n"; 3230 3231 if (!g_file_get_contents(fname, &content, NULL, &err)) { 3232 slog("failed to read '%s', error: %s", fname, err->message); 3233 goto fail; 3234 } 3235 3236 if (!g_utf8_validate(content, -1, NULL)) { 3237 slog("file is not utf-8 encoded: %s", fname); 3238 goto fail; 3239 } 3240 content2 = g_strdup_printf("%s%s", group, content); 3241 3242 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 3243 &err)) { 3244 slog("failed to parse file '%s', error: %s", fname, err->message); 3245 goto fail; 3246 } 3247 3248 g_free(content); 3249 g_free(content2); 3250 return keys; 3251 3252 fail: 3253 g_error_free(err); 3254 g_free(content); 3255 g_free(content2); 3256 g_key_file_free(keys); 3257 return NULL; 3258 } 3259 3260 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 3261 { 3262 GuestOSInfo *info = NULL; 3263 struct utsname kinfo; 3264 GKeyFile *osrelease = NULL; 3265 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 3266 3267 info = g_new0(GuestOSInfo, 1); 3268 3269 if (uname(&kinfo) != 0) { 3270 error_setg_errno(errp, errno, "uname failed"); 3271 } else { 3272 info->has_kernel_version = true; 3273 info->kernel_version = g_strdup(kinfo.version); 3274 info->has_kernel_release = true; 3275 info->kernel_release = g_strdup(kinfo.release); 3276 info->has_machine = true; 3277 info->machine = g_strdup(kinfo.machine); 3278 } 3279 3280 if (qga_os_release != NULL) { 3281 osrelease = ga_parse_osrelease(qga_os_release); 3282 } else { 3283 osrelease = ga_parse_osrelease("/etc/os-release"); 3284 if (osrelease == NULL) { 3285 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3286 } 3287 } 3288 3289 if (osrelease != NULL) { 3290 char *value; 3291 3292 #define GET_FIELD(field, osfield) do { \ 3293 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3294 if (value != NULL) { \ 3295 ga_osrelease_replace_special(value); \ 3296 info->has_ ## field = true; \ 3297 info->field = value; \ 3298 } \ 3299 } while (0) 3300 GET_FIELD(id, "ID"); 3301 GET_FIELD(name, "NAME"); 3302 GET_FIELD(pretty_name, "PRETTY_NAME"); 3303 GET_FIELD(version, "VERSION"); 3304 GET_FIELD(version_id, "VERSION_ID"); 3305 GET_FIELD(variant, "VARIANT"); 3306 GET_FIELD(variant_id, "VARIANT_ID"); 3307 #undef GET_FIELD 3308 3309 g_key_file_free(osrelease); 3310 } 3311 3312 return info; 3313 } 3314 3315 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3316 { 3317 error_setg(errp, QERR_UNSUPPORTED); 3318 3319 return NULL; 3320 } 3321