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 GuestDiskAddressList *list = NULL; 1040 bool has_hwinf; 1041 #ifdef CONFIG_LIBUDEV 1042 struct udev *udev = NULL; 1043 struct udev_device *udevice = NULL; 1044 #endif 1045 1046 pciaddr = g_new0(GuestPCIAddress, 1); 1047 pciaddr->domain = -1; /* -1 means field is invalid */ 1048 pciaddr->bus = -1; 1049 pciaddr->slot = -1; 1050 pciaddr->function = -1; 1051 1052 disk = g_new0(GuestDiskAddress, 1); 1053 disk->pci_controller = pciaddr; 1054 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN; 1055 1056 list = g_new0(GuestDiskAddressList, 1); 1057 list->value = disk; 1058 1059 #ifdef CONFIG_LIBUDEV 1060 udev = udev_new(); 1061 udevice = udev_device_new_from_syspath(udev, syspath); 1062 if (udev == NULL || udevice == NULL) { 1063 g_debug("failed to query udev"); 1064 } else { 1065 const char *devnode, *serial; 1066 devnode = udev_device_get_devnode(udevice); 1067 if (devnode != NULL) { 1068 disk->dev = g_strdup(devnode); 1069 disk->has_dev = true; 1070 } 1071 serial = udev_device_get_property_value(udevice, "ID_SERIAL"); 1072 if (serial != NULL && *serial != 0) { 1073 disk->serial = g_strdup(serial); 1074 disk->has_serial = true; 1075 } 1076 } 1077 1078 udev_unref(udev); 1079 udev_device_unref(udevice); 1080 #endif 1081 1082 if (strstr(syspath, "/devices/pci")) { 1083 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp); 1084 } else if (strstr(syspath, "/virtio")) { 1085 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1086 } else { 1087 g_debug("Unsupported device type for '%s'", syspath); 1088 has_hwinf = false; 1089 } 1090 1091 if (has_hwinf || disk->has_dev || disk->has_serial) { 1092 list->next = fs->disk; 1093 fs->disk = list; 1094 } else { 1095 qapi_free_GuestDiskAddressList(list); 1096 } 1097 } 1098 1099 static void build_guest_fsinfo_for_device(char const *devpath, 1100 GuestFilesystemInfo *fs, 1101 Error **errp); 1102 1103 /* Store a list of slave devices of virtual volume specified by @syspath into 1104 * @fs */ 1105 static void build_guest_fsinfo_for_virtual_device(char const *syspath, 1106 GuestFilesystemInfo *fs, 1107 Error **errp) 1108 { 1109 Error *err = NULL; 1110 DIR *dir; 1111 char *dirpath; 1112 struct dirent *entry; 1113 1114 dirpath = g_strdup_printf("%s/slaves", syspath); 1115 dir = opendir(dirpath); 1116 if (!dir) { 1117 if (errno != ENOENT) { 1118 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath); 1119 } 1120 g_free(dirpath); 1121 return; 1122 } 1123 1124 for (;;) { 1125 errno = 0; 1126 entry = readdir(dir); 1127 if (entry == NULL) { 1128 if (errno) { 1129 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath); 1130 } 1131 break; 1132 } 1133 1134 if (entry->d_type == DT_LNK) { 1135 char *path; 1136 1137 g_debug(" slave device '%s'", entry->d_name); 1138 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name); 1139 build_guest_fsinfo_for_device(path, fs, &err); 1140 g_free(path); 1141 1142 if (err) { 1143 error_propagate(errp, err); 1144 break; 1145 } 1146 } 1147 } 1148 1149 g_free(dirpath); 1150 closedir(dir); 1151 } 1152 1153 /* Dispatch to functions for virtual/real device */ 1154 static void build_guest_fsinfo_for_device(char const *devpath, 1155 GuestFilesystemInfo *fs, 1156 Error **errp) 1157 { 1158 char *syspath = realpath(devpath, NULL); 1159 1160 if (!syspath) { 1161 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1162 return; 1163 } 1164 1165 if (!fs->name) { 1166 fs->name = g_path_get_basename(syspath); 1167 } 1168 1169 g_debug(" parse sysfs path '%s'", syspath); 1170 1171 if (strstr(syspath, "/devices/virtual/block/")) { 1172 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1173 } else { 1174 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1175 } 1176 1177 free(syspath); 1178 } 1179 1180 /* Return a list of the disk device(s)' info which @mount lies on */ 1181 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1182 Error **errp) 1183 { 1184 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1185 struct statvfs buf; 1186 unsigned long used, nonroot_total, fr_size; 1187 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1188 mount->devmajor, mount->devminor); 1189 1190 fs->mountpoint = g_strdup(mount->dirname); 1191 fs->type = g_strdup(mount->devtype); 1192 build_guest_fsinfo_for_device(devpath, fs, errp); 1193 1194 if (statvfs(fs->mountpoint, &buf) == 0) { 1195 fr_size = buf.f_frsize; 1196 used = buf.f_blocks - buf.f_bfree; 1197 nonroot_total = used + buf.f_bavail; 1198 fs->used_bytes = used * fr_size; 1199 fs->total_bytes = nonroot_total * fr_size; 1200 1201 fs->has_total_bytes = true; 1202 fs->has_used_bytes = true; 1203 } 1204 1205 g_free(devpath); 1206 1207 return fs; 1208 } 1209 1210 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1211 { 1212 FsMountList mounts; 1213 struct FsMount *mount; 1214 GuestFilesystemInfoList *new, *ret = NULL; 1215 Error *local_err = NULL; 1216 1217 QTAILQ_INIT(&mounts); 1218 build_fs_mount_list(&mounts, &local_err); 1219 if (local_err) { 1220 error_propagate(errp, local_err); 1221 return NULL; 1222 } 1223 1224 QTAILQ_FOREACH(mount, &mounts, next) { 1225 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1226 1227 new = g_malloc0(sizeof(*ret)); 1228 new->value = build_guest_fsinfo(mount, &local_err); 1229 new->next = ret; 1230 ret = new; 1231 if (local_err) { 1232 error_propagate(errp, local_err); 1233 qapi_free_GuestFilesystemInfoList(ret); 1234 ret = NULL; 1235 break; 1236 } 1237 } 1238 1239 free_fs_mount_list(&mounts); 1240 return ret; 1241 } 1242 1243 1244 typedef enum { 1245 FSFREEZE_HOOK_THAW = 0, 1246 FSFREEZE_HOOK_FREEZE, 1247 } FsfreezeHookArg; 1248 1249 static const char *fsfreeze_hook_arg_string[] = { 1250 "thaw", 1251 "freeze", 1252 }; 1253 1254 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1255 { 1256 int status; 1257 pid_t pid; 1258 const char *hook; 1259 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1260 Error *local_err = NULL; 1261 1262 hook = ga_fsfreeze_hook(ga_state); 1263 if (!hook) { 1264 return; 1265 } 1266 if (access(hook, X_OK) != 0) { 1267 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1268 return; 1269 } 1270 1271 slog("executing fsfreeze hook with arg '%s'", arg_str); 1272 pid = fork(); 1273 if (pid == 0) { 1274 setsid(); 1275 reopen_fd_to_null(0); 1276 reopen_fd_to_null(1); 1277 reopen_fd_to_null(2); 1278 1279 execle(hook, hook, arg_str, NULL, environ); 1280 _exit(EXIT_FAILURE); 1281 } else if (pid < 0) { 1282 error_setg_errno(errp, errno, "failed to create child process"); 1283 return; 1284 } 1285 1286 ga_wait_child(pid, &status, &local_err); 1287 if (local_err) { 1288 error_propagate(errp, local_err); 1289 return; 1290 } 1291 1292 if (!WIFEXITED(status)) { 1293 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1294 return; 1295 } 1296 1297 status = WEXITSTATUS(status); 1298 if (status) { 1299 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1300 return; 1301 } 1302 } 1303 1304 /* 1305 * Return status of freeze/thaw 1306 */ 1307 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1308 { 1309 if (ga_is_frozen(ga_state)) { 1310 return GUEST_FSFREEZE_STATUS_FROZEN; 1311 } 1312 1313 return GUEST_FSFREEZE_STATUS_THAWED; 1314 } 1315 1316 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1317 { 1318 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1319 } 1320 1321 /* 1322 * Walk list of mounted file systems in the guest, and freeze the ones which 1323 * are real local file systems. 1324 */ 1325 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1326 strList *mountpoints, 1327 Error **errp) 1328 { 1329 int ret = 0, i = 0; 1330 strList *list; 1331 FsMountList mounts; 1332 struct FsMount *mount; 1333 Error *local_err = NULL; 1334 int fd; 1335 1336 slog("guest-fsfreeze called"); 1337 1338 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1339 if (local_err) { 1340 error_propagate(errp, local_err); 1341 return -1; 1342 } 1343 1344 QTAILQ_INIT(&mounts); 1345 build_fs_mount_list(&mounts, &local_err); 1346 if (local_err) { 1347 error_propagate(errp, local_err); 1348 return -1; 1349 } 1350 1351 /* cannot risk guest agent blocking itself on a write in this state */ 1352 ga_set_frozen(ga_state); 1353 1354 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1355 /* To issue fsfreeze in the reverse order of mounts, check if the 1356 * mount is listed in the list here */ 1357 if (has_mountpoints) { 1358 for (list = mountpoints; list; list = list->next) { 1359 if (strcmp(list->value, mount->dirname) == 0) { 1360 break; 1361 } 1362 } 1363 if (!list) { 1364 continue; 1365 } 1366 } 1367 1368 fd = qemu_open(mount->dirname, O_RDONLY); 1369 if (fd == -1) { 1370 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1371 goto error; 1372 } 1373 1374 /* we try to cull filesystems we know won't work in advance, but other 1375 * filesystems may not implement fsfreeze for less obvious reasons. 1376 * these will report EOPNOTSUPP. we simply ignore these when tallying 1377 * the number of frozen filesystems. 1378 * if a filesystem is mounted more than once (aka bind mount) a 1379 * consecutive attempt to freeze an already frozen filesystem will 1380 * return EBUSY. 1381 * 1382 * any other error means a failure to freeze a filesystem we 1383 * expect to be freezable, so return an error in those cases 1384 * and return system to thawed state. 1385 */ 1386 ret = ioctl(fd, FIFREEZE); 1387 if (ret == -1) { 1388 if (errno != EOPNOTSUPP && errno != EBUSY) { 1389 error_setg_errno(errp, errno, "failed to freeze %s", 1390 mount->dirname); 1391 close(fd); 1392 goto error; 1393 } 1394 } else { 1395 i++; 1396 } 1397 close(fd); 1398 } 1399 1400 free_fs_mount_list(&mounts); 1401 /* We may not issue any FIFREEZE here. 1402 * Just unset ga_state here and ready for the next call. 1403 */ 1404 if (i == 0) { 1405 ga_unset_frozen(ga_state); 1406 } 1407 return i; 1408 1409 error: 1410 free_fs_mount_list(&mounts); 1411 qmp_guest_fsfreeze_thaw(NULL); 1412 return 0; 1413 } 1414 1415 /* 1416 * Walk list of frozen file systems in the guest, and thaw them. 1417 */ 1418 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1419 { 1420 int ret; 1421 FsMountList mounts; 1422 FsMount *mount; 1423 int fd, i = 0, logged; 1424 Error *local_err = NULL; 1425 1426 QTAILQ_INIT(&mounts); 1427 build_fs_mount_list(&mounts, &local_err); 1428 if (local_err) { 1429 error_propagate(errp, local_err); 1430 return 0; 1431 } 1432 1433 QTAILQ_FOREACH(mount, &mounts, next) { 1434 logged = false; 1435 fd = qemu_open(mount->dirname, O_RDONLY); 1436 if (fd == -1) { 1437 continue; 1438 } 1439 /* we have no way of knowing whether a filesystem was actually unfrozen 1440 * as a result of a successful call to FITHAW, only that if an error 1441 * was returned the filesystem was *not* unfrozen by that particular 1442 * call. 1443 * 1444 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1445 * to unfreeze, continuing issuing FITHAW until an error is returned, 1446 * in which case either the filesystem is in an unfreezable state, or, 1447 * more likely, it was thawed previously (and remains so afterward). 1448 * 1449 * also, since the most recent successful call is the one that did 1450 * the actual unfreeze, we can use this to provide an accurate count 1451 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1452 * may * be useful for determining whether a filesystem was unfrozen 1453 * during the freeze/thaw phase by a process other than qemu-ga. 1454 */ 1455 do { 1456 ret = ioctl(fd, FITHAW); 1457 if (ret == 0 && !logged) { 1458 i++; 1459 logged = true; 1460 } 1461 } while (ret == 0); 1462 close(fd); 1463 } 1464 1465 ga_unset_frozen(ga_state); 1466 free_fs_mount_list(&mounts); 1467 1468 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1469 1470 return i; 1471 } 1472 1473 static void guest_fsfreeze_cleanup(void) 1474 { 1475 Error *err = NULL; 1476 1477 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1478 qmp_guest_fsfreeze_thaw(&err); 1479 if (err) { 1480 slog("failed to clean up frozen filesystems: %s", 1481 error_get_pretty(err)); 1482 error_free(err); 1483 } 1484 } 1485 } 1486 #endif /* CONFIG_FSFREEZE */ 1487 1488 #if defined(CONFIG_FSTRIM) 1489 /* 1490 * Walk list of mounted file systems in the guest, and trim them. 1491 */ 1492 GuestFilesystemTrimResponse * 1493 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1494 { 1495 GuestFilesystemTrimResponse *response; 1496 GuestFilesystemTrimResultList *list; 1497 GuestFilesystemTrimResult *result; 1498 int ret = 0; 1499 FsMountList mounts; 1500 struct FsMount *mount; 1501 int fd; 1502 Error *local_err = NULL; 1503 struct fstrim_range r; 1504 1505 slog("guest-fstrim called"); 1506 1507 QTAILQ_INIT(&mounts); 1508 build_fs_mount_list(&mounts, &local_err); 1509 if (local_err) { 1510 error_propagate(errp, local_err); 1511 return NULL; 1512 } 1513 1514 response = g_malloc0(sizeof(*response)); 1515 1516 QTAILQ_FOREACH(mount, &mounts, next) { 1517 result = g_malloc0(sizeof(*result)); 1518 result->path = g_strdup(mount->dirname); 1519 1520 list = g_malloc0(sizeof(*list)); 1521 list->value = result; 1522 list->next = response->paths; 1523 response->paths = list; 1524 1525 fd = qemu_open(mount->dirname, O_RDONLY); 1526 if (fd == -1) { 1527 result->error = g_strdup_printf("failed to open: %s", 1528 strerror(errno)); 1529 result->has_error = true; 1530 continue; 1531 } 1532 1533 /* We try to cull filesystems we know won't work in advance, but other 1534 * filesystems may not implement fstrim for less obvious reasons. 1535 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1536 * will be reported (e.g. CD-ROMs). 1537 * Any other error means an unexpected error. 1538 */ 1539 r.start = 0; 1540 r.len = -1; 1541 r.minlen = has_minimum ? minimum : 0; 1542 ret = ioctl(fd, FITRIM, &r); 1543 if (ret == -1) { 1544 result->has_error = true; 1545 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1546 result->error = g_strdup("trim not supported"); 1547 } else { 1548 result->error = g_strdup_printf("failed to trim: %s", 1549 strerror(errno)); 1550 } 1551 close(fd); 1552 continue; 1553 } 1554 1555 result->has_minimum = true; 1556 result->minimum = r.minlen; 1557 result->has_trimmed = true; 1558 result->trimmed = r.len; 1559 close(fd); 1560 } 1561 1562 free_fs_mount_list(&mounts); 1563 return response; 1564 } 1565 #endif /* CONFIG_FSTRIM */ 1566 1567 1568 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1569 #define SUSPEND_SUPPORTED 0 1570 #define SUSPEND_NOT_SUPPORTED 1 1571 1572 typedef enum { 1573 SUSPEND_MODE_DISK = 0, 1574 SUSPEND_MODE_RAM = 1, 1575 SUSPEND_MODE_HYBRID = 2, 1576 } SuspendMode; 1577 1578 /* 1579 * Executes a command in a child process using g_spawn_sync, 1580 * returning an int >= 0 representing the exit status of the 1581 * process. 1582 * 1583 * If the program wasn't found in path, returns -1. 1584 * 1585 * If a problem happened when creating the child process, 1586 * returns -1 and errp is set. 1587 */ 1588 static int run_process_child(const char *command[], Error **errp) 1589 { 1590 int exit_status, spawn_flag; 1591 GError *g_err = NULL; 1592 bool success; 1593 1594 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1595 G_SPAWN_STDERR_TO_DEV_NULL; 1596 1597 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1598 NULL, NULL, NULL, NULL, 1599 &exit_status, &g_err); 1600 1601 if (success) { 1602 return WEXITSTATUS(exit_status); 1603 } 1604 1605 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1606 error_setg(errp, "failed to create child process, error '%s'", 1607 g_err->message); 1608 } 1609 1610 g_error_free(g_err); 1611 return -1; 1612 } 1613 1614 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1615 { 1616 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1617 "systemd-hybrid-sleep"}; 1618 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1619 int status; 1620 1621 status = run_process_child(cmd, errp); 1622 1623 /* 1624 * systemctl status uses LSB return codes so we can expect 1625 * status > 0 and be ok. To assert if the guest has support 1626 * for the selected suspend mode, status should be < 4. 4 is 1627 * the code for unknown service status, the return value when 1628 * the service does not exist. A common value is status = 3 1629 * (program is not running). 1630 */ 1631 if (status > 0 && status < 4) { 1632 return true; 1633 } 1634 1635 return false; 1636 } 1637 1638 static void systemd_suspend(SuspendMode mode, Error **errp) 1639 { 1640 Error *local_err = NULL; 1641 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1642 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1643 int status; 1644 1645 status = run_process_child(cmd, &local_err); 1646 1647 if (status == 0) { 1648 return; 1649 } 1650 1651 if ((status == -1) && !local_err) { 1652 error_setg(errp, "the helper program 'systemctl %s' was not found", 1653 systemctl_args[mode]); 1654 return; 1655 } 1656 1657 if (local_err) { 1658 error_propagate(errp, local_err); 1659 } else { 1660 error_setg(errp, "the helper program 'systemctl %s' returned an " 1661 "unexpected exit status code (%d)", 1662 systemctl_args[mode], status); 1663 } 1664 } 1665 1666 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1667 { 1668 Error *local_err = NULL; 1669 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1670 "--suspend-hybrid"}; 1671 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1672 int status; 1673 1674 status = run_process_child(cmd, &local_err); 1675 1676 if (status == SUSPEND_SUPPORTED) { 1677 return true; 1678 } 1679 1680 if ((status == -1) && !local_err) { 1681 return false; 1682 } 1683 1684 if (local_err) { 1685 error_propagate(errp, local_err); 1686 } else { 1687 error_setg(errp, 1688 "the helper program '%s' returned an unexpected exit" 1689 " status code (%d)", "pm-is-supported", status); 1690 } 1691 1692 return false; 1693 } 1694 1695 static void pmutils_suspend(SuspendMode mode, Error **errp) 1696 { 1697 Error *local_err = NULL; 1698 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1699 "pm-suspend-hybrid"}; 1700 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1701 int status; 1702 1703 status = run_process_child(cmd, &local_err); 1704 1705 if (status == 0) { 1706 return; 1707 } 1708 1709 if ((status == -1) && !local_err) { 1710 error_setg(errp, "the helper program '%s' was not found", 1711 pmutils_binaries[mode]); 1712 return; 1713 } 1714 1715 if (local_err) { 1716 error_propagate(errp, local_err); 1717 } else { 1718 error_setg(errp, 1719 "the helper program '%s' returned an unexpected exit" 1720 " status code (%d)", pmutils_binaries[mode], status); 1721 } 1722 } 1723 1724 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 1725 { 1726 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 1727 const char *sysfile_str = sysfile_strs[mode]; 1728 char buf[32]; /* hopefully big enough */ 1729 int fd; 1730 ssize_t ret; 1731 1732 if (!sysfile_str) { 1733 error_setg(errp, "unknown guest suspend mode"); 1734 return false; 1735 } 1736 1737 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 1738 if (fd < 0) { 1739 return false; 1740 } 1741 1742 ret = read(fd, buf, sizeof(buf) - 1); 1743 close(fd); 1744 if (ret <= 0) { 1745 return false; 1746 } 1747 buf[ret] = '\0'; 1748 1749 if (strstr(buf, sysfile_str)) { 1750 return true; 1751 } 1752 return false; 1753 } 1754 1755 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 1756 { 1757 Error *local_err = NULL; 1758 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 1759 const char *sysfile_str = sysfile_strs[mode]; 1760 pid_t pid; 1761 int status; 1762 1763 if (!sysfile_str) { 1764 error_setg(errp, "unknown guest suspend mode"); 1765 return; 1766 } 1767 1768 pid = fork(); 1769 if (!pid) { 1770 /* child */ 1771 int fd; 1772 1773 setsid(); 1774 reopen_fd_to_null(0); 1775 reopen_fd_to_null(1); 1776 reopen_fd_to_null(2); 1777 1778 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 1779 if (fd < 0) { 1780 _exit(EXIT_FAILURE); 1781 } 1782 1783 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 1784 _exit(EXIT_FAILURE); 1785 } 1786 1787 _exit(EXIT_SUCCESS); 1788 } else if (pid < 0) { 1789 error_setg_errno(errp, errno, "failed to create child process"); 1790 return; 1791 } 1792 1793 ga_wait_child(pid, &status, &local_err); 1794 if (local_err) { 1795 error_propagate(errp, local_err); 1796 return; 1797 } 1798 1799 if (WEXITSTATUS(status)) { 1800 error_setg(errp, "child process has failed to suspend"); 1801 } 1802 1803 } 1804 1805 static void guest_suspend(SuspendMode mode, Error **errp) 1806 { 1807 Error *local_err = NULL; 1808 bool mode_supported = false; 1809 1810 if (systemd_supports_mode(mode, &local_err)) { 1811 mode_supported = true; 1812 systemd_suspend(mode, &local_err); 1813 } 1814 1815 if (!local_err) { 1816 return; 1817 } 1818 1819 error_free(local_err); 1820 local_err = NULL; 1821 1822 if (pmutils_supports_mode(mode, &local_err)) { 1823 mode_supported = true; 1824 pmutils_suspend(mode, &local_err); 1825 } 1826 1827 if (!local_err) { 1828 return; 1829 } 1830 1831 error_free(local_err); 1832 local_err = NULL; 1833 1834 if (linux_sys_state_supports_mode(mode, &local_err)) { 1835 mode_supported = true; 1836 linux_sys_state_suspend(mode, &local_err); 1837 } 1838 1839 if (!mode_supported) { 1840 error_free(local_err); 1841 error_setg(errp, 1842 "the requested suspend mode is not supported by the guest"); 1843 } else { 1844 error_propagate(errp, local_err); 1845 } 1846 } 1847 1848 void qmp_guest_suspend_disk(Error **errp) 1849 { 1850 guest_suspend(SUSPEND_MODE_DISK, errp); 1851 } 1852 1853 void qmp_guest_suspend_ram(Error **errp) 1854 { 1855 guest_suspend(SUSPEND_MODE_RAM, errp); 1856 } 1857 1858 void qmp_guest_suspend_hybrid(Error **errp) 1859 { 1860 guest_suspend(SUSPEND_MODE_HYBRID, errp); 1861 } 1862 1863 static GuestNetworkInterfaceList * 1864 guest_find_interface(GuestNetworkInterfaceList *head, 1865 const char *name) 1866 { 1867 for (; head; head = head->next) { 1868 if (strcmp(head->value->name, name) == 0) { 1869 break; 1870 } 1871 } 1872 1873 return head; 1874 } 1875 1876 static int guest_get_network_stats(const char *name, 1877 GuestNetworkInterfaceStat *stats) 1878 { 1879 int name_len; 1880 char const *devinfo = "/proc/net/dev"; 1881 FILE *fp; 1882 char *line = NULL, *colon; 1883 size_t n = 0; 1884 fp = fopen(devinfo, "r"); 1885 if (!fp) { 1886 return -1; 1887 } 1888 name_len = strlen(name); 1889 while (getline(&line, &n, fp) != -1) { 1890 long long dummy; 1891 long long rx_bytes; 1892 long long rx_packets; 1893 long long rx_errs; 1894 long long rx_dropped; 1895 long long tx_bytes; 1896 long long tx_packets; 1897 long long tx_errs; 1898 long long tx_dropped; 1899 char *trim_line; 1900 trim_line = g_strchug(line); 1901 if (trim_line[0] == '\0') { 1902 continue; 1903 } 1904 colon = strchr(trim_line, ':'); 1905 if (!colon) { 1906 continue; 1907 } 1908 if (colon - name_len == trim_line && 1909 strncmp(trim_line, name, name_len) == 0) { 1910 if (sscanf(colon + 1, 1911 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 1912 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 1913 &dummy, &dummy, &dummy, &dummy, 1914 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 1915 &dummy, &dummy, &dummy, &dummy) != 16) { 1916 continue; 1917 } 1918 stats->rx_bytes = rx_bytes; 1919 stats->rx_packets = rx_packets; 1920 stats->rx_errs = rx_errs; 1921 stats->rx_dropped = rx_dropped; 1922 stats->tx_bytes = tx_bytes; 1923 stats->tx_packets = tx_packets; 1924 stats->tx_errs = tx_errs; 1925 stats->tx_dropped = tx_dropped; 1926 fclose(fp); 1927 g_free(line); 1928 return 0; 1929 } 1930 } 1931 fclose(fp); 1932 g_free(line); 1933 g_debug("/proc/net/dev: Interface '%s' not found", name); 1934 return -1; 1935 } 1936 1937 /* 1938 * Build information about guest interfaces 1939 */ 1940 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 1941 { 1942 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 1943 struct ifaddrs *ifap, *ifa; 1944 1945 if (getifaddrs(&ifap) < 0) { 1946 error_setg_errno(errp, errno, "getifaddrs failed"); 1947 goto error; 1948 } 1949 1950 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1951 GuestNetworkInterfaceList *info; 1952 GuestIpAddressList **address_list = NULL, *address_item = NULL; 1953 GuestNetworkInterfaceStat *interface_stat = NULL; 1954 char addr4[INET_ADDRSTRLEN]; 1955 char addr6[INET6_ADDRSTRLEN]; 1956 int sock; 1957 struct ifreq ifr; 1958 unsigned char *mac_addr; 1959 void *p; 1960 1961 g_debug("Processing %s interface", ifa->ifa_name); 1962 1963 info = guest_find_interface(head, ifa->ifa_name); 1964 1965 if (!info) { 1966 info = g_malloc0(sizeof(*info)); 1967 info->value = g_malloc0(sizeof(*info->value)); 1968 info->value->name = g_strdup(ifa->ifa_name); 1969 1970 if (!cur_item) { 1971 head = cur_item = info; 1972 } else { 1973 cur_item->next = info; 1974 cur_item = info; 1975 } 1976 } 1977 1978 if (!info->value->has_hardware_address && 1979 ifa->ifa_flags & SIOCGIFHWADDR) { 1980 /* we haven't obtained HW address yet */ 1981 sock = socket(PF_INET, SOCK_STREAM, 0); 1982 if (sock == -1) { 1983 error_setg_errno(errp, errno, "failed to create socket"); 1984 goto error; 1985 } 1986 1987 memset(&ifr, 0, sizeof(ifr)); 1988 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 1989 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 1990 error_setg_errno(errp, errno, 1991 "failed to get MAC address of %s", 1992 ifa->ifa_name); 1993 close(sock); 1994 goto error; 1995 } 1996 1997 close(sock); 1998 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 1999 2000 info->value->hardware_address = 2001 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2002 (int) mac_addr[0], (int) mac_addr[1], 2003 (int) mac_addr[2], (int) mac_addr[3], 2004 (int) mac_addr[4], (int) mac_addr[5]); 2005 2006 info->value->has_hardware_address = true; 2007 } 2008 2009 if (ifa->ifa_addr && 2010 ifa->ifa_addr->sa_family == AF_INET) { 2011 /* interface with IPv4 address */ 2012 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2013 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2014 error_setg_errno(errp, errno, "inet_ntop failed"); 2015 goto error; 2016 } 2017 2018 address_item = g_malloc0(sizeof(*address_item)); 2019 address_item->value = g_malloc0(sizeof(*address_item->value)); 2020 address_item->value->ip_address = g_strdup(addr4); 2021 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2022 2023 if (ifa->ifa_netmask) { 2024 /* Count the number of set bits in netmask. 2025 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2026 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2027 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 2028 } 2029 } else if (ifa->ifa_addr && 2030 ifa->ifa_addr->sa_family == AF_INET6) { 2031 /* interface with IPv6 address */ 2032 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2033 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2034 error_setg_errno(errp, errno, "inet_ntop failed"); 2035 goto error; 2036 } 2037 2038 address_item = g_malloc0(sizeof(*address_item)); 2039 address_item->value = g_malloc0(sizeof(*address_item->value)); 2040 address_item->value->ip_address = g_strdup(addr6); 2041 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2042 2043 if (ifa->ifa_netmask) { 2044 /* Count the number of set bits in netmask. 2045 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2046 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2047 address_item->value->prefix = 2048 ctpop32(((uint32_t *) p)[0]) + 2049 ctpop32(((uint32_t *) p)[1]) + 2050 ctpop32(((uint32_t *) p)[2]) + 2051 ctpop32(((uint32_t *) p)[3]); 2052 } 2053 } 2054 2055 if (!address_item) { 2056 continue; 2057 } 2058 2059 address_list = &info->value->ip_addresses; 2060 2061 while (*address_list && (*address_list)->next) { 2062 address_list = &(*address_list)->next; 2063 } 2064 2065 if (!*address_list) { 2066 *address_list = address_item; 2067 } else { 2068 (*address_list)->next = address_item; 2069 } 2070 2071 info->value->has_ip_addresses = true; 2072 2073 if (!info->value->has_statistics) { 2074 interface_stat = g_malloc0(sizeof(*interface_stat)); 2075 if (guest_get_network_stats(info->value->name, 2076 interface_stat) == -1) { 2077 info->value->has_statistics = false; 2078 g_free(interface_stat); 2079 } else { 2080 info->value->statistics = interface_stat; 2081 info->value->has_statistics = true; 2082 } 2083 } 2084 } 2085 2086 freeifaddrs(ifap); 2087 return head; 2088 2089 error: 2090 freeifaddrs(ifap); 2091 qapi_free_GuestNetworkInterfaceList(head); 2092 return NULL; 2093 } 2094 2095 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 2096 2097 static long sysconf_exact(int name, const char *name_str, Error **errp) 2098 { 2099 long ret; 2100 2101 errno = 0; 2102 ret = sysconf(name); 2103 if (ret == -1) { 2104 if (errno == 0) { 2105 error_setg(errp, "sysconf(%s): value indefinite", name_str); 2106 } else { 2107 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 2108 } 2109 } 2110 return ret; 2111 } 2112 2113 /* Transfer online/offline status between @vcpu and the guest system. 2114 * 2115 * On input either @errp or *@errp must be NULL. 2116 * 2117 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2118 * - R: vcpu->logical_id 2119 * - W: vcpu->online 2120 * - W: vcpu->can_offline 2121 * 2122 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2123 * - R: vcpu->logical_id 2124 * - R: vcpu->online 2125 * 2126 * Written members remain unmodified on error. 2127 */ 2128 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2129 char *dirpath, Error **errp) 2130 { 2131 int fd; 2132 int res; 2133 int dirfd; 2134 static const char fn[] = "online"; 2135 2136 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2137 if (dirfd == -1) { 2138 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2139 return; 2140 } 2141 2142 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2143 if (fd == -1) { 2144 if (errno != ENOENT) { 2145 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2146 } else if (sys2vcpu) { 2147 vcpu->online = true; 2148 vcpu->can_offline = false; 2149 } else if (!vcpu->online) { 2150 error_setg(errp, "logical processor #%" PRId64 " can't be " 2151 "offlined", vcpu->logical_id); 2152 } /* otherwise pretend successful re-onlining */ 2153 } else { 2154 unsigned char status; 2155 2156 res = pread(fd, &status, 1, 0); 2157 if (res == -1) { 2158 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2159 } else if (res == 0) { 2160 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2161 fn); 2162 } else if (sys2vcpu) { 2163 vcpu->online = (status != '0'); 2164 vcpu->can_offline = true; 2165 } else if (vcpu->online != (status != '0')) { 2166 status = '0' + vcpu->online; 2167 if (pwrite(fd, &status, 1, 0) == -1) { 2168 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2169 fn); 2170 } 2171 } /* otherwise pretend successful re-(on|off)-lining */ 2172 2173 res = close(fd); 2174 g_assert(res == 0); 2175 } 2176 2177 res = close(dirfd); 2178 g_assert(res == 0); 2179 } 2180 2181 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2182 { 2183 int64_t current; 2184 GuestLogicalProcessorList *head, **link; 2185 long sc_max; 2186 Error *local_err = NULL; 2187 2188 current = 0; 2189 head = NULL; 2190 link = &head; 2191 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 2192 2193 while (local_err == NULL && current < sc_max) { 2194 GuestLogicalProcessor *vcpu; 2195 GuestLogicalProcessorList *entry; 2196 int64_t id = current++; 2197 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2198 id); 2199 2200 if (g_file_test(path, G_FILE_TEST_EXISTS)) { 2201 vcpu = g_malloc0(sizeof *vcpu); 2202 vcpu->logical_id = id; 2203 vcpu->has_can_offline = true; /* lolspeak ftw */ 2204 transfer_vcpu(vcpu, true, path, &local_err); 2205 entry = g_malloc0(sizeof *entry); 2206 entry->value = vcpu; 2207 *link = entry; 2208 link = &entry->next; 2209 } 2210 g_free(path); 2211 } 2212 2213 if (local_err == NULL) { 2214 /* there's no guest with zero VCPUs */ 2215 g_assert(head != NULL); 2216 return head; 2217 } 2218 2219 qapi_free_GuestLogicalProcessorList(head); 2220 error_propagate(errp, local_err); 2221 return NULL; 2222 } 2223 2224 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2225 { 2226 int64_t processed; 2227 Error *local_err = NULL; 2228 2229 processed = 0; 2230 while (vcpus != NULL) { 2231 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2232 vcpus->value->logical_id); 2233 2234 transfer_vcpu(vcpus->value, false, path, &local_err); 2235 g_free(path); 2236 if (local_err != NULL) { 2237 break; 2238 } 2239 ++processed; 2240 vcpus = vcpus->next; 2241 } 2242 2243 if (local_err != NULL) { 2244 if (processed == 0) { 2245 error_propagate(errp, local_err); 2246 } else { 2247 error_free(local_err); 2248 } 2249 } 2250 2251 return processed; 2252 } 2253 2254 void qmp_guest_set_user_password(const char *username, 2255 const char *password, 2256 bool crypted, 2257 Error **errp) 2258 { 2259 Error *local_err = NULL; 2260 char *passwd_path = NULL; 2261 pid_t pid; 2262 int status; 2263 int datafd[2] = { -1, -1 }; 2264 char *rawpasswddata = NULL; 2265 size_t rawpasswdlen; 2266 char *chpasswddata = NULL; 2267 size_t chpasswdlen; 2268 2269 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 2270 if (!rawpasswddata) { 2271 return; 2272 } 2273 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 2274 rawpasswddata[rawpasswdlen] = '\0'; 2275 2276 if (strchr(rawpasswddata, '\n')) { 2277 error_setg(errp, "forbidden characters in raw password"); 2278 goto out; 2279 } 2280 2281 if (strchr(username, '\n') || 2282 strchr(username, ':')) { 2283 error_setg(errp, "forbidden characters in username"); 2284 goto out; 2285 } 2286 2287 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 2288 chpasswdlen = strlen(chpasswddata); 2289 2290 passwd_path = g_find_program_in_path("chpasswd"); 2291 2292 if (!passwd_path) { 2293 error_setg(errp, "cannot find 'passwd' program in PATH"); 2294 goto out; 2295 } 2296 2297 if (pipe(datafd) < 0) { 2298 error_setg(errp, "cannot create pipe FDs"); 2299 goto out; 2300 } 2301 2302 pid = fork(); 2303 if (pid == 0) { 2304 close(datafd[1]); 2305 /* child */ 2306 setsid(); 2307 dup2(datafd[0], 0); 2308 reopen_fd_to_null(1); 2309 reopen_fd_to_null(2); 2310 2311 if (crypted) { 2312 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2313 } else { 2314 execle(passwd_path, "chpasswd", NULL, environ); 2315 } 2316 _exit(EXIT_FAILURE); 2317 } else if (pid < 0) { 2318 error_setg_errno(errp, errno, "failed to create child process"); 2319 goto out; 2320 } 2321 close(datafd[0]); 2322 datafd[0] = -1; 2323 2324 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2325 error_setg_errno(errp, errno, "cannot write new account password"); 2326 goto out; 2327 } 2328 close(datafd[1]); 2329 datafd[1] = -1; 2330 2331 ga_wait_child(pid, &status, &local_err); 2332 if (local_err) { 2333 error_propagate(errp, local_err); 2334 goto out; 2335 } 2336 2337 if (!WIFEXITED(status)) { 2338 error_setg(errp, "child process has terminated abnormally"); 2339 goto out; 2340 } 2341 2342 if (WEXITSTATUS(status)) { 2343 error_setg(errp, "child process has failed to set user password"); 2344 goto out; 2345 } 2346 2347 out: 2348 g_free(chpasswddata); 2349 g_free(rawpasswddata); 2350 g_free(passwd_path); 2351 if (datafd[0] != -1) { 2352 close(datafd[0]); 2353 } 2354 if (datafd[1] != -1) { 2355 close(datafd[1]); 2356 } 2357 } 2358 2359 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2360 int size, Error **errp) 2361 { 2362 int fd; 2363 int res; 2364 2365 errno = 0; 2366 fd = openat(dirfd, pathname, O_RDONLY); 2367 if (fd == -1) { 2368 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2369 return; 2370 } 2371 2372 res = pread(fd, buf, size, 0); 2373 if (res == -1) { 2374 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2375 } else if (res == 0) { 2376 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2377 } 2378 close(fd); 2379 } 2380 2381 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2382 const char *buf, int size, Error **errp) 2383 { 2384 int fd; 2385 2386 errno = 0; 2387 fd = openat(dirfd, pathname, O_WRONLY); 2388 if (fd == -1) { 2389 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2390 return; 2391 } 2392 2393 if (pwrite(fd, buf, size, 0) == -1) { 2394 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2395 } 2396 2397 close(fd); 2398 } 2399 2400 /* Transfer online/offline status between @mem_blk and the guest system. 2401 * 2402 * On input either @errp or *@errp must be NULL. 2403 * 2404 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2405 * - R: mem_blk->phys_index 2406 * - W: mem_blk->online 2407 * - W: mem_blk->can_offline 2408 * 2409 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2410 * - R: mem_blk->phys_index 2411 * - R: mem_blk->online 2412 *- R: mem_blk->can_offline 2413 * Written members remain unmodified on error. 2414 */ 2415 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2416 GuestMemoryBlockResponse *result, 2417 Error **errp) 2418 { 2419 char *dirpath; 2420 int dirfd; 2421 char *status; 2422 Error *local_err = NULL; 2423 2424 if (!sys2memblk) { 2425 DIR *dp; 2426 2427 if (!result) { 2428 error_setg(errp, "Internal error, 'result' should not be NULL"); 2429 return; 2430 } 2431 errno = 0; 2432 dp = opendir("/sys/devices/system/memory/"); 2433 /* if there is no 'memory' directory in sysfs, 2434 * we think this VM does not support online/offline memory block, 2435 * any other solution? 2436 */ 2437 if (!dp) { 2438 if (errno == ENOENT) { 2439 result->response = 2440 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2441 } 2442 goto out1; 2443 } 2444 closedir(dp); 2445 } 2446 2447 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2448 mem_blk->phys_index); 2449 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2450 if (dirfd == -1) { 2451 if (sys2memblk) { 2452 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2453 } else { 2454 if (errno == ENOENT) { 2455 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2456 } else { 2457 result->response = 2458 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2459 } 2460 } 2461 g_free(dirpath); 2462 goto out1; 2463 } 2464 g_free(dirpath); 2465 2466 status = g_malloc0(10); 2467 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2468 if (local_err) { 2469 /* treat with sysfs file that not exist in old kernel */ 2470 if (errno == ENOENT) { 2471 error_free(local_err); 2472 if (sys2memblk) { 2473 mem_blk->online = true; 2474 mem_blk->can_offline = false; 2475 } else if (!mem_blk->online) { 2476 result->response = 2477 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2478 } 2479 } else { 2480 if (sys2memblk) { 2481 error_propagate(errp, local_err); 2482 } else { 2483 error_free(local_err); 2484 result->response = 2485 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2486 } 2487 } 2488 goto out2; 2489 } 2490 2491 if (sys2memblk) { 2492 char removable = '0'; 2493 2494 mem_blk->online = (strncmp(status, "online", 6) == 0); 2495 2496 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2497 if (local_err) { 2498 /* if no 'removable' file, it doesn't support offline mem blk */ 2499 if (errno == ENOENT) { 2500 error_free(local_err); 2501 mem_blk->can_offline = false; 2502 } else { 2503 error_propagate(errp, local_err); 2504 } 2505 } else { 2506 mem_blk->can_offline = (removable != '0'); 2507 } 2508 } else { 2509 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2510 const char *new_state = mem_blk->online ? "online" : "offline"; 2511 2512 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2513 &local_err); 2514 if (local_err) { 2515 error_free(local_err); 2516 result->response = 2517 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2518 goto out2; 2519 } 2520 2521 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2522 result->has_error_code = false; 2523 } /* otherwise pretend successful re-(on|off)-lining */ 2524 } 2525 g_free(status); 2526 close(dirfd); 2527 return; 2528 2529 out2: 2530 g_free(status); 2531 close(dirfd); 2532 out1: 2533 if (!sys2memblk) { 2534 result->has_error_code = true; 2535 result->error_code = errno; 2536 } 2537 } 2538 2539 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2540 { 2541 GuestMemoryBlockList *head, **link; 2542 Error *local_err = NULL; 2543 struct dirent *de; 2544 DIR *dp; 2545 2546 head = NULL; 2547 link = &head; 2548 2549 dp = opendir("/sys/devices/system/memory/"); 2550 if (!dp) { 2551 /* it's ok if this happens to be a system that doesn't expose 2552 * memory blocks via sysfs, but otherwise we should report 2553 * an error 2554 */ 2555 if (errno != ENOENT) { 2556 error_setg_errno(errp, errno, "Can't open directory" 2557 "\"/sys/devices/system/memory/\""); 2558 } 2559 return NULL; 2560 } 2561 2562 /* Note: the phys_index of memory block may be discontinuous, 2563 * this is because a memblk is the unit of the Sparse Memory design, which 2564 * allows discontinuous memory ranges (ex. NUMA), so here we should 2565 * traverse the memory block directory. 2566 */ 2567 while ((de = readdir(dp)) != NULL) { 2568 GuestMemoryBlock *mem_blk; 2569 GuestMemoryBlockList *entry; 2570 2571 if ((strncmp(de->d_name, "memory", 6) != 0) || 2572 !(de->d_type & DT_DIR)) { 2573 continue; 2574 } 2575 2576 mem_blk = g_malloc0(sizeof *mem_blk); 2577 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2578 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2579 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2580 transfer_memory_block(mem_blk, true, NULL, &local_err); 2581 if (local_err) { 2582 break; 2583 } 2584 2585 entry = g_malloc0(sizeof *entry); 2586 entry->value = mem_blk; 2587 2588 *link = entry; 2589 link = &entry->next; 2590 } 2591 2592 closedir(dp); 2593 if (local_err == NULL) { 2594 /* there's no guest with zero memory blocks */ 2595 if (head == NULL) { 2596 error_setg(errp, "guest reported zero memory blocks!"); 2597 } 2598 return head; 2599 } 2600 2601 qapi_free_GuestMemoryBlockList(head); 2602 error_propagate(errp, local_err); 2603 return NULL; 2604 } 2605 2606 GuestMemoryBlockResponseList * 2607 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2608 { 2609 GuestMemoryBlockResponseList *head, **link; 2610 Error *local_err = NULL; 2611 2612 head = NULL; 2613 link = &head; 2614 2615 while (mem_blks != NULL) { 2616 GuestMemoryBlockResponse *result; 2617 GuestMemoryBlockResponseList *entry; 2618 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2619 2620 result = g_malloc0(sizeof(*result)); 2621 result->phys_index = current_mem_blk->phys_index; 2622 transfer_memory_block(current_mem_blk, false, result, &local_err); 2623 if (local_err) { /* should never happen */ 2624 goto err; 2625 } 2626 entry = g_malloc0(sizeof *entry); 2627 entry->value = result; 2628 2629 *link = entry; 2630 link = &entry->next; 2631 mem_blks = mem_blks->next; 2632 } 2633 2634 return head; 2635 err: 2636 qapi_free_GuestMemoryBlockResponseList(head); 2637 error_propagate(errp, local_err); 2638 return NULL; 2639 } 2640 2641 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2642 { 2643 Error *local_err = NULL; 2644 char *dirpath; 2645 int dirfd; 2646 char *buf; 2647 GuestMemoryBlockInfo *info; 2648 2649 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2650 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2651 if (dirfd == -1) { 2652 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2653 g_free(dirpath); 2654 return NULL; 2655 } 2656 g_free(dirpath); 2657 2658 buf = g_malloc0(20); 2659 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2660 close(dirfd); 2661 if (local_err) { 2662 g_free(buf); 2663 error_propagate(errp, local_err); 2664 return NULL; 2665 } 2666 2667 info = g_new0(GuestMemoryBlockInfo, 1); 2668 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2669 2670 g_free(buf); 2671 2672 return info; 2673 } 2674 2675 #else /* defined(__linux__) */ 2676 2677 void qmp_guest_suspend_disk(Error **errp) 2678 { 2679 error_setg(errp, QERR_UNSUPPORTED); 2680 } 2681 2682 void qmp_guest_suspend_ram(Error **errp) 2683 { 2684 error_setg(errp, QERR_UNSUPPORTED); 2685 } 2686 2687 void qmp_guest_suspend_hybrid(Error **errp) 2688 { 2689 error_setg(errp, QERR_UNSUPPORTED); 2690 } 2691 2692 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2693 { 2694 error_setg(errp, QERR_UNSUPPORTED); 2695 return NULL; 2696 } 2697 2698 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2699 { 2700 error_setg(errp, QERR_UNSUPPORTED); 2701 return NULL; 2702 } 2703 2704 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2705 { 2706 error_setg(errp, QERR_UNSUPPORTED); 2707 return -1; 2708 } 2709 2710 void qmp_guest_set_user_password(const char *username, 2711 const char *password, 2712 bool crypted, 2713 Error **errp) 2714 { 2715 error_setg(errp, QERR_UNSUPPORTED); 2716 } 2717 2718 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2719 { 2720 error_setg(errp, QERR_UNSUPPORTED); 2721 return NULL; 2722 } 2723 2724 GuestMemoryBlockResponseList * 2725 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2726 { 2727 error_setg(errp, QERR_UNSUPPORTED); 2728 return NULL; 2729 } 2730 2731 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2732 { 2733 error_setg(errp, QERR_UNSUPPORTED); 2734 return NULL; 2735 } 2736 2737 #endif 2738 2739 #if !defined(CONFIG_FSFREEZE) 2740 2741 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 2742 { 2743 error_setg(errp, QERR_UNSUPPORTED); 2744 return NULL; 2745 } 2746 2747 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 2748 { 2749 error_setg(errp, QERR_UNSUPPORTED); 2750 2751 return 0; 2752 } 2753 2754 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 2755 { 2756 error_setg(errp, QERR_UNSUPPORTED); 2757 2758 return 0; 2759 } 2760 2761 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 2762 strList *mountpoints, 2763 Error **errp) 2764 { 2765 error_setg(errp, QERR_UNSUPPORTED); 2766 2767 return 0; 2768 } 2769 2770 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 2771 { 2772 error_setg(errp, QERR_UNSUPPORTED); 2773 2774 return 0; 2775 } 2776 #endif /* CONFIG_FSFREEZE */ 2777 2778 #if !defined(CONFIG_FSTRIM) 2779 GuestFilesystemTrimResponse * 2780 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 2781 { 2782 error_setg(errp, QERR_UNSUPPORTED); 2783 return NULL; 2784 } 2785 #endif 2786 2787 /* add unsupported commands to the blacklist */ 2788 GList *ga_command_blacklist_init(GList *blacklist) 2789 { 2790 #if !defined(__linux__) 2791 { 2792 const char *list[] = { 2793 "guest-suspend-disk", "guest-suspend-ram", 2794 "guest-suspend-hybrid", "guest-network-get-interfaces", 2795 "guest-get-vcpus", "guest-set-vcpus", 2796 "guest-get-memory-blocks", "guest-set-memory-blocks", 2797 "guest-get-memory-block-size", "guest-get-memory-block-info", 2798 NULL}; 2799 char **p = (char **)list; 2800 2801 while (*p) { 2802 blacklist = g_list_append(blacklist, g_strdup(*p++)); 2803 } 2804 } 2805 #endif 2806 2807 #if !defined(CONFIG_FSFREEZE) 2808 { 2809 const char *list[] = { 2810 "guest-get-fsinfo", "guest-fsfreeze-status", 2811 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 2812 "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL}; 2813 char **p = (char **)list; 2814 2815 while (*p) { 2816 blacklist = g_list_append(blacklist, g_strdup(*p++)); 2817 } 2818 } 2819 #endif 2820 2821 #if !defined(CONFIG_FSTRIM) 2822 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 2823 #endif 2824 2825 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 2826 2827 return blacklist; 2828 } 2829 2830 /* register init/cleanup routines for stateful command groups */ 2831 void ga_command_state_init(GAState *s, GACommandState *cs) 2832 { 2833 #if defined(CONFIG_FSFREEZE) 2834 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 2835 #endif 2836 } 2837 2838 #ifdef HAVE_UTMPX 2839 2840 #define QGA_MICRO_SECOND_TO_SECOND 1000000 2841 2842 static double ga_get_login_time(struct utmpx *user_info) 2843 { 2844 double seconds = (double)user_info->ut_tv.tv_sec; 2845 double useconds = (double)user_info->ut_tv.tv_usec; 2846 useconds /= QGA_MICRO_SECOND_TO_SECOND; 2847 return seconds + useconds; 2848 } 2849 2850 GuestUserList *qmp_guest_get_users(Error **errp) 2851 { 2852 GHashTable *cache = NULL; 2853 GuestUserList *head = NULL, *cur_item = NULL; 2854 struct utmpx *user_info = NULL; 2855 gpointer value = NULL; 2856 GuestUser *user = NULL; 2857 GuestUserList *item = NULL; 2858 double login_time = 0; 2859 2860 cache = g_hash_table_new(g_str_hash, g_str_equal); 2861 setutxent(); 2862 2863 for (;;) { 2864 user_info = getutxent(); 2865 if (user_info == NULL) { 2866 break; 2867 } else if (user_info->ut_type != USER_PROCESS) { 2868 continue; 2869 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 2870 value = g_hash_table_lookup(cache, user_info->ut_user); 2871 user = (GuestUser *)value; 2872 login_time = ga_get_login_time(user_info); 2873 /* We're ensuring the earliest login time to be sent */ 2874 if (login_time < user->login_time) { 2875 user->login_time = login_time; 2876 } 2877 continue; 2878 } 2879 2880 item = g_new0(GuestUserList, 1); 2881 item->value = g_new0(GuestUser, 1); 2882 item->value->user = g_strdup(user_info->ut_user); 2883 item->value->login_time = ga_get_login_time(user_info); 2884 2885 g_hash_table_insert(cache, item->value->user, item->value); 2886 2887 if (!cur_item) { 2888 head = cur_item = item; 2889 } else { 2890 cur_item->next = item; 2891 cur_item = item; 2892 } 2893 } 2894 endutxent(); 2895 g_hash_table_destroy(cache); 2896 return head; 2897 } 2898 2899 #else 2900 2901 GuestUserList *qmp_guest_get_users(Error **errp) 2902 { 2903 error_setg(errp, QERR_UNSUPPORTED); 2904 return NULL; 2905 } 2906 2907 #endif 2908 2909 /* Replace escaped special characters with theire real values. The replacement 2910 * is done in place -- returned value is in the original string. 2911 */ 2912 static void ga_osrelease_replace_special(gchar *value) 2913 { 2914 gchar *p, *p2, quote; 2915 2916 /* Trim the string at first space or semicolon if it is not enclosed in 2917 * single or double quotes. */ 2918 if ((value[0] != '"') || (value[0] == '\'')) { 2919 p = strchr(value, ' '); 2920 if (p != NULL) { 2921 *p = 0; 2922 } 2923 p = strchr(value, ';'); 2924 if (p != NULL) { 2925 *p = 0; 2926 } 2927 return; 2928 } 2929 2930 quote = value[0]; 2931 p2 = value; 2932 p = value + 1; 2933 while (*p != 0) { 2934 if (*p == '\\') { 2935 p++; 2936 switch (*p) { 2937 case '$': 2938 case '\'': 2939 case '"': 2940 case '\\': 2941 case '`': 2942 break; 2943 default: 2944 /* Keep literal backslash followed by whatever is there */ 2945 p--; 2946 break; 2947 } 2948 } else if (*p == quote) { 2949 *p2 = 0; 2950 break; 2951 } 2952 *(p2++) = *(p++); 2953 } 2954 } 2955 2956 static GKeyFile *ga_parse_osrelease(const char *fname) 2957 { 2958 gchar *content = NULL; 2959 gchar *content2 = NULL; 2960 GError *err = NULL; 2961 GKeyFile *keys = g_key_file_new(); 2962 const char *group = "[os-release]\n"; 2963 2964 if (!g_file_get_contents(fname, &content, NULL, &err)) { 2965 slog("failed to read '%s', error: %s", fname, err->message); 2966 goto fail; 2967 } 2968 2969 if (!g_utf8_validate(content, -1, NULL)) { 2970 slog("file is not utf-8 encoded: %s", fname); 2971 goto fail; 2972 } 2973 content2 = g_strdup_printf("%s%s", group, content); 2974 2975 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 2976 &err)) { 2977 slog("failed to parse file '%s', error: %s", fname, err->message); 2978 goto fail; 2979 } 2980 2981 g_free(content); 2982 g_free(content2); 2983 return keys; 2984 2985 fail: 2986 g_error_free(err); 2987 g_free(content); 2988 g_free(content2); 2989 g_key_file_free(keys); 2990 return NULL; 2991 } 2992 2993 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 2994 { 2995 GuestOSInfo *info = NULL; 2996 struct utsname kinfo; 2997 GKeyFile *osrelease = NULL; 2998 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 2999 3000 info = g_new0(GuestOSInfo, 1); 3001 3002 if (uname(&kinfo) != 0) { 3003 error_setg_errno(errp, errno, "uname failed"); 3004 } else { 3005 info->has_kernel_version = true; 3006 info->kernel_version = g_strdup(kinfo.version); 3007 info->has_kernel_release = true; 3008 info->kernel_release = g_strdup(kinfo.release); 3009 info->has_machine = true; 3010 info->machine = g_strdup(kinfo.machine); 3011 } 3012 3013 if (qga_os_release != NULL) { 3014 osrelease = ga_parse_osrelease(qga_os_release); 3015 } else { 3016 osrelease = ga_parse_osrelease("/etc/os-release"); 3017 if (osrelease == NULL) { 3018 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3019 } 3020 } 3021 3022 if (osrelease != NULL) { 3023 char *value; 3024 3025 #define GET_FIELD(field, osfield) do { \ 3026 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3027 if (value != NULL) { \ 3028 ga_osrelease_replace_special(value); \ 3029 info->has_ ## field = true; \ 3030 info->field = value; \ 3031 } \ 3032 } while (0) 3033 GET_FIELD(id, "ID"); 3034 GET_FIELD(name, "NAME"); 3035 GET_FIELD(pretty_name, "PRETTY_NAME"); 3036 GET_FIELD(version, "VERSION"); 3037 GET_FIELD(version_id, "VERSION_ID"); 3038 GET_FIELD(variant, "VARIANT"); 3039 GET_FIELD(variant_id, "VARIANT_ID"); 3040 #undef GET_FIELD 3041 3042 g_key_file_free(osrelease); 3043 } 3044 3045 return info; 3046 } 3047 3048 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3049 { 3050 error_setg(errp, QERR_UNSUPPORTED); 3051 3052 return NULL; 3053 } 3054