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 /* 1033 * Store disk device info for CCW devices (s390x channel I/O devices). 1034 * Returns true if information has been stored, or false for failure. 1035 */ 1036 static bool build_guest_fsinfo_for_ccw_dev(char const *syspath, 1037 GuestDiskAddress *disk, 1038 Error **errp) 1039 { 1040 unsigned int cssid, ssid, subchno, devno; 1041 char *p; 1042 1043 p = strstr(syspath, "/devices/css"); 1044 if (!p || sscanf(p + 12, "%*x/%x.%x.%x/%*x.%*x.%x/", 1045 &cssid, &ssid, &subchno, &devno) < 4) { 1046 g_debug("could not parse ccw device sysfs path: %s", syspath); 1047 return false; 1048 } 1049 1050 disk->has_ccw_address = true; 1051 disk->ccw_address = g_new0(GuestCCWAddress, 1); 1052 disk->ccw_address->cssid = cssid; 1053 disk->ccw_address->ssid = ssid; 1054 disk->ccw_address->subchno = subchno; 1055 disk->ccw_address->devno = devno; 1056 1057 if (strstr(p, "/virtio")) { 1058 build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1059 } 1060 1061 return true; 1062 } 1063 1064 /* Store disk device info specified by @sysfs into @fs */ 1065 static void build_guest_fsinfo_for_real_device(char const *syspath, 1066 GuestFilesystemInfo *fs, 1067 Error **errp) 1068 { 1069 GuestDiskAddress *disk; 1070 GuestPCIAddress *pciaddr; 1071 bool has_hwinf; 1072 #ifdef CONFIG_LIBUDEV 1073 struct udev *udev = NULL; 1074 struct udev_device *udevice = NULL; 1075 #endif 1076 1077 pciaddr = g_new0(GuestPCIAddress, 1); 1078 pciaddr->domain = -1; /* -1 means field is invalid */ 1079 pciaddr->bus = -1; 1080 pciaddr->slot = -1; 1081 pciaddr->function = -1; 1082 1083 disk = g_new0(GuestDiskAddress, 1); 1084 disk->pci_controller = pciaddr; 1085 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN; 1086 1087 #ifdef CONFIG_LIBUDEV 1088 udev = udev_new(); 1089 udevice = udev_device_new_from_syspath(udev, syspath); 1090 if (udev == NULL || udevice == NULL) { 1091 g_debug("failed to query udev"); 1092 } else { 1093 const char *devnode, *serial; 1094 devnode = udev_device_get_devnode(udevice); 1095 if (devnode != NULL) { 1096 disk->dev = g_strdup(devnode); 1097 disk->has_dev = true; 1098 } 1099 serial = udev_device_get_property_value(udevice, "ID_SERIAL"); 1100 if (serial != NULL && *serial != 0) { 1101 disk->serial = g_strdup(serial); 1102 disk->has_serial = true; 1103 } 1104 } 1105 1106 udev_unref(udev); 1107 udev_device_unref(udevice); 1108 #endif 1109 1110 if (strstr(syspath, "/devices/pci")) { 1111 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp); 1112 } else if (strstr(syspath, "/devices/css")) { 1113 has_hwinf = build_guest_fsinfo_for_ccw_dev(syspath, disk, errp); 1114 } else if (strstr(syspath, "/virtio")) { 1115 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1116 } else { 1117 g_debug("Unsupported device type for '%s'", syspath); 1118 has_hwinf = false; 1119 } 1120 1121 if (has_hwinf || disk->has_dev || disk->has_serial) { 1122 QAPI_LIST_PREPEND(fs->disk, disk); 1123 } else { 1124 qapi_free_GuestDiskAddress(disk); 1125 } 1126 } 1127 1128 static void build_guest_fsinfo_for_device(char const *devpath, 1129 GuestFilesystemInfo *fs, 1130 Error **errp); 1131 1132 /* Store a list of slave devices of virtual volume specified by @syspath into 1133 * @fs */ 1134 static void build_guest_fsinfo_for_virtual_device(char const *syspath, 1135 GuestFilesystemInfo *fs, 1136 Error **errp) 1137 { 1138 Error *err = NULL; 1139 DIR *dir; 1140 char *dirpath; 1141 struct dirent *entry; 1142 1143 dirpath = g_strdup_printf("%s/slaves", syspath); 1144 dir = opendir(dirpath); 1145 if (!dir) { 1146 if (errno != ENOENT) { 1147 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath); 1148 } 1149 g_free(dirpath); 1150 return; 1151 } 1152 1153 for (;;) { 1154 errno = 0; 1155 entry = readdir(dir); 1156 if (entry == NULL) { 1157 if (errno) { 1158 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath); 1159 } 1160 break; 1161 } 1162 1163 if (entry->d_type == DT_LNK) { 1164 char *path; 1165 1166 g_debug(" slave device '%s'", entry->d_name); 1167 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name); 1168 build_guest_fsinfo_for_device(path, fs, &err); 1169 g_free(path); 1170 1171 if (err) { 1172 error_propagate(errp, err); 1173 break; 1174 } 1175 } 1176 } 1177 1178 g_free(dirpath); 1179 closedir(dir); 1180 } 1181 1182 static bool is_disk_virtual(const char *devpath, Error **errp) 1183 { 1184 g_autofree char *syspath = realpath(devpath, NULL); 1185 1186 if (!syspath) { 1187 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1188 return false; 1189 } 1190 return strstr(syspath, "/devices/virtual/block/") != NULL; 1191 } 1192 1193 /* Dispatch to functions for virtual/real device */ 1194 static void build_guest_fsinfo_for_device(char const *devpath, 1195 GuestFilesystemInfo *fs, 1196 Error **errp) 1197 { 1198 ERRP_GUARD(); 1199 g_autofree char *syspath = NULL; 1200 bool is_virtual = false; 1201 1202 syspath = realpath(devpath, NULL); 1203 if (!syspath) { 1204 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1205 return; 1206 } 1207 1208 if (!fs->name) { 1209 fs->name = g_path_get_basename(syspath); 1210 } 1211 1212 g_debug(" parse sysfs path '%s'", syspath); 1213 is_virtual = is_disk_virtual(syspath, errp); 1214 if (*errp != NULL) { 1215 return; 1216 } 1217 if (is_virtual) { 1218 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1219 } else { 1220 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1221 } 1222 } 1223 1224 #ifdef CONFIG_LIBUDEV 1225 1226 /* 1227 * Wrapper around build_guest_fsinfo_for_device() for getting just 1228 * the disk address. 1229 */ 1230 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp) 1231 { 1232 g_autoptr(GuestFilesystemInfo) fs = NULL; 1233 1234 fs = g_new0(GuestFilesystemInfo, 1); 1235 build_guest_fsinfo_for_device(syspath, fs, errp); 1236 if (fs->disk != NULL) { 1237 return g_steal_pointer(&fs->disk->value); 1238 } 1239 return NULL; 1240 } 1241 1242 static char *get_alias_for_syspath(const char *syspath) 1243 { 1244 struct udev *udev = NULL; 1245 struct udev_device *udevice = NULL; 1246 char *ret = NULL; 1247 1248 udev = udev_new(); 1249 if (udev == NULL) { 1250 g_debug("failed to query udev"); 1251 goto out; 1252 } 1253 udevice = udev_device_new_from_syspath(udev, syspath); 1254 if (udevice == NULL) { 1255 g_debug("failed to query udev for path: %s", syspath); 1256 goto out; 1257 } else { 1258 const char *alias = udev_device_get_property_value( 1259 udevice, "DM_NAME"); 1260 /* 1261 * NULL means there was an error and empty string means there is no 1262 * alias. In case of no alias we return NULL instead of empty string. 1263 */ 1264 if (alias == NULL) { 1265 g_debug("failed to query udev for device alias for: %s", 1266 syspath); 1267 } else if (*alias != 0) { 1268 ret = g_strdup(alias); 1269 } 1270 } 1271 1272 out: 1273 udev_unref(udev); 1274 udev_device_unref(udevice); 1275 return ret; 1276 } 1277 1278 static char *get_device_for_syspath(const char *syspath) 1279 { 1280 struct udev *udev = NULL; 1281 struct udev_device *udevice = NULL; 1282 char *ret = NULL; 1283 1284 udev = udev_new(); 1285 if (udev == NULL) { 1286 g_debug("failed to query udev"); 1287 goto out; 1288 } 1289 udevice = udev_device_new_from_syspath(udev, syspath); 1290 if (udevice == NULL) { 1291 g_debug("failed to query udev for path: %s", syspath); 1292 goto out; 1293 } else { 1294 ret = g_strdup(udev_device_get_devnode(udevice)); 1295 } 1296 1297 out: 1298 udev_unref(udev); 1299 udev_device_unref(udevice); 1300 return ret; 1301 } 1302 1303 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk) 1304 { 1305 g_autofree char *deps_dir = NULL; 1306 const gchar *dep; 1307 GDir *dp_deps = NULL; 1308 1309 /* List dependent disks */ 1310 deps_dir = g_strdup_printf("%s/slaves", disk_dir); 1311 g_debug(" listing entries in: %s", deps_dir); 1312 dp_deps = g_dir_open(deps_dir, 0, NULL); 1313 if (dp_deps == NULL) { 1314 g_debug("failed to list entries in %s", deps_dir); 1315 return; 1316 } 1317 disk->has_dependencies = true; 1318 while ((dep = g_dir_read_name(dp_deps)) != NULL) { 1319 g_autofree char *dep_dir = NULL; 1320 char *dev_name; 1321 1322 /* Add dependent disks */ 1323 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep); 1324 dev_name = get_device_for_syspath(dep_dir); 1325 if (dev_name != NULL) { 1326 g_debug(" adding dependent device: %s", dev_name); 1327 QAPI_LIST_PREPEND(disk->dependencies, dev_name); 1328 } 1329 } 1330 g_dir_close(dp_deps); 1331 } 1332 1333 /* 1334 * Detect partitions subdirectory, name is "<disk_name><number>" or 1335 * "<disk_name>p<number>" 1336 * 1337 * @disk_name -- last component of /sys path (e.g. sda) 1338 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda) 1339 * @disk_dev -- device node of the disk (e.g. /dev/sda) 1340 */ 1341 static GuestDiskInfoList *get_disk_partitions( 1342 GuestDiskInfoList *list, 1343 const char *disk_name, const char *disk_dir, 1344 const char *disk_dev) 1345 { 1346 GuestDiskInfoList *ret = list; 1347 struct dirent *de_disk; 1348 DIR *dp_disk = NULL; 1349 size_t len = strlen(disk_name); 1350 1351 dp_disk = opendir(disk_dir); 1352 while ((de_disk = readdir(dp_disk)) != NULL) { 1353 g_autofree char *partition_dir = NULL; 1354 char *dev_name; 1355 GuestDiskInfo *partition; 1356 1357 if (!(de_disk->d_type & DT_DIR)) { 1358 continue; 1359 } 1360 1361 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 && 1362 ((*(de_disk->d_name + len) == 'p' && 1363 isdigit(*(de_disk->d_name + len + 1))) || 1364 isdigit(*(de_disk->d_name + len))))) { 1365 continue; 1366 } 1367 1368 partition_dir = g_strdup_printf("%s/%s", 1369 disk_dir, de_disk->d_name); 1370 dev_name = get_device_for_syspath(partition_dir); 1371 if (dev_name == NULL) { 1372 g_debug("Failed to get device name for syspath: %s", 1373 disk_dir); 1374 continue; 1375 } 1376 partition = g_new0(GuestDiskInfo, 1); 1377 partition->name = dev_name; 1378 partition->partition = true; 1379 /* Add parent disk as dependent for easier tracking of hierarchy */ 1380 QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev)); 1381 1382 QAPI_LIST_PREPEND(ret, partition); 1383 } 1384 closedir(dp_disk); 1385 1386 return ret; 1387 } 1388 1389 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1390 { 1391 GuestDiskInfoList *ret = NULL; 1392 GuestDiskInfo *disk; 1393 DIR *dp = NULL; 1394 struct dirent *de = NULL; 1395 1396 g_debug("listing /sys/block directory"); 1397 dp = opendir("/sys/block"); 1398 if (dp == NULL) { 1399 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\""); 1400 return NULL; 1401 } 1402 while ((de = readdir(dp)) != NULL) { 1403 g_autofree char *disk_dir = NULL, *line = NULL, 1404 *size_path = NULL; 1405 char *dev_name; 1406 Error *local_err = NULL; 1407 if (de->d_type != DT_LNK) { 1408 g_debug(" skipping entry: %s", de->d_name); 1409 continue; 1410 } 1411 1412 /* Check size and skip zero-sized disks */ 1413 g_debug(" checking disk size"); 1414 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name); 1415 if (!g_file_get_contents(size_path, &line, NULL, NULL)) { 1416 g_debug(" failed to read disk size"); 1417 continue; 1418 } 1419 if (g_strcmp0(line, "0\n") == 0) { 1420 g_debug(" skipping zero-sized disk"); 1421 continue; 1422 } 1423 1424 g_debug(" adding %s", de->d_name); 1425 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name); 1426 dev_name = get_device_for_syspath(disk_dir); 1427 if (dev_name == NULL) { 1428 g_debug("Failed to get device name for syspath: %s", 1429 disk_dir); 1430 continue; 1431 } 1432 disk = g_new0(GuestDiskInfo, 1); 1433 disk->name = dev_name; 1434 disk->partition = false; 1435 disk->alias = get_alias_for_syspath(disk_dir); 1436 disk->has_alias = (disk->alias != NULL); 1437 QAPI_LIST_PREPEND(ret, disk); 1438 1439 /* Get address for non-virtual devices */ 1440 bool is_virtual = is_disk_virtual(disk_dir, &local_err); 1441 if (local_err != NULL) { 1442 g_debug(" failed to check disk path, ignoring error: %s", 1443 error_get_pretty(local_err)); 1444 error_free(local_err); 1445 local_err = NULL; 1446 /* Don't try to get the address */ 1447 is_virtual = true; 1448 } 1449 if (!is_virtual) { 1450 disk->address = get_disk_address(disk_dir, &local_err); 1451 if (local_err != NULL) { 1452 g_debug(" failed to get device info, ignoring error: %s", 1453 error_get_pretty(local_err)); 1454 error_free(local_err); 1455 local_err = NULL; 1456 } else if (disk->address != NULL) { 1457 disk->has_address = true; 1458 } 1459 } 1460 1461 get_disk_deps(disk_dir, disk); 1462 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); 1463 } 1464 1465 closedir(dp); 1466 1467 return ret; 1468 } 1469 1470 #else 1471 1472 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1473 { 1474 error_setg(errp, QERR_UNSUPPORTED); 1475 return NULL; 1476 } 1477 1478 #endif 1479 1480 /* Return a list of the disk device(s)' info which @mount lies on */ 1481 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1482 Error **errp) 1483 { 1484 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1485 struct statvfs buf; 1486 unsigned long used, nonroot_total, fr_size; 1487 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1488 mount->devmajor, mount->devminor); 1489 1490 fs->mountpoint = g_strdup(mount->dirname); 1491 fs->type = g_strdup(mount->devtype); 1492 build_guest_fsinfo_for_device(devpath, fs, errp); 1493 1494 if (statvfs(fs->mountpoint, &buf) == 0) { 1495 fr_size = buf.f_frsize; 1496 used = buf.f_blocks - buf.f_bfree; 1497 nonroot_total = used + buf.f_bavail; 1498 fs->used_bytes = used * fr_size; 1499 fs->total_bytes = nonroot_total * fr_size; 1500 1501 fs->has_total_bytes = true; 1502 fs->has_used_bytes = true; 1503 } 1504 1505 g_free(devpath); 1506 1507 return fs; 1508 } 1509 1510 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1511 { 1512 FsMountList mounts; 1513 struct FsMount *mount; 1514 GuestFilesystemInfoList *ret = NULL; 1515 Error *local_err = NULL; 1516 1517 QTAILQ_INIT(&mounts); 1518 build_fs_mount_list(&mounts, &local_err); 1519 if (local_err) { 1520 error_propagate(errp, local_err); 1521 return NULL; 1522 } 1523 1524 QTAILQ_FOREACH(mount, &mounts, next) { 1525 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1526 1527 QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err)); 1528 if (local_err) { 1529 error_propagate(errp, local_err); 1530 qapi_free_GuestFilesystemInfoList(ret); 1531 ret = NULL; 1532 break; 1533 } 1534 } 1535 1536 free_fs_mount_list(&mounts); 1537 return ret; 1538 } 1539 1540 1541 typedef enum { 1542 FSFREEZE_HOOK_THAW = 0, 1543 FSFREEZE_HOOK_FREEZE, 1544 } FsfreezeHookArg; 1545 1546 static const char *fsfreeze_hook_arg_string[] = { 1547 "thaw", 1548 "freeze", 1549 }; 1550 1551 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1552 { 1553 int status; 1554 pid_t pid; 1555 const char *hook; 1556 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1557 Error *local_err = NULL; 1558 1559 hook = ga_fsfreeze_hook(ga_state); 1560 if (!hook) { 1561 return; 1562 } 1563 if (access(hook, X_OK) != 0) { 1564 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1565 return; 1566 } 1567 1568 slog("executing fsfreeze hook with arg '%s'", arg_str); 1569 pid = fork(); 1570 if (pid == 0) { 1571 setsid(); 1572 reopen_fd_to_null(0); 1573 reopen_fd_to_null(1); 1574 reopen_fd_to_null(2); 1575 1576 execle(hook, hook, arg_str, NULL, environ); 1577 _exit(EXIT_FAILURE); 1578 } else if (pid < 0) { 1579 error_setg_errno(errp, errno, "failed to create child process"); 1580 return; 1581 } 1582 1583 ga_wait_child(pid, &status, &local_err); 1584 if (local_err) { 1585 error_propagate(errp, local_err); 1586 return; 1587 } 1588 1589 if (!WIFEXITED(status)) { 1590 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1591 return; 1592 } 1593 1594 status = WEXITSTATUS(status); 1595 if (status) { 1596 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1597 return; 1598 } 1599 } 1600 1601 /* 1602 * Return status of freeze/thaw 1603 */ 1604 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1605 { 1606 if (ga_is_frozen(ga_state)) { 1607 return GUEST_FSFREEZE_STATUS_FROZEN; 1608 } 1609 1610 return GUEST_FSFREEZE_STATUS_THAWED; 1611 } 1612 1613 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1614 { 1615 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1616 } 1617 1618 /* 1619 * Walk list of mounted file systems in the guest, and freeze the ones which 1620 * are real local file systems. 1621 */ 1622 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1623 strList *mountpoints, 1624 Error **errp) 1625 { 1626 int ret = 0, i = 0; 1627 strList *list; 1628 FsMountList mounts; 1629 struct FsMount *mount; 1630 Error *local_err = NULL; 1631 int fd; 1632 1633 slog("guest-fsfreeze called"); 1634 1635 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1636 if (local_err) { 1637 error_propagate(errp, local_err); 1638 return -1; 1639 } 1640 1641 QTAILQ_INIT(&mounts); 1642 build_fs_mount_list(&mounts, &local_err); 1643 if (local_err) { 1644 error_propagate(errp, local_err); 1645 return -1; 1646 } 1647 1648 /* cannot risk guest agent blocking itself on a write in this state */ 1649 ga_set_frozen(ga_state); 1650 1651 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1652 /* To issue fsfreeze in the reverse order of mounts, check if the 1653 * mount is listed in the list here */ 1654 if (has_mountpoints) { 1655 for (list = mountpoints; list; list = list->next) { 1656 if (strcmp(list->value, mount->dirname) == 0) { 1657 break; 1658 } 1659 } 1660 if (!list) { 1661 continue; 1662 } 1663 } 1664 1665 fd = qemu_open_old(mount->dirname, O_RDONLY); 1666 if (fd == -1) { 1667 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1668 goto error; 1669 } 1670 1671 /* we try to cull filesystems we know won't work in advance, but other 1672 * filesystems may not implement fsfreeze for less obvious reasons. 1673 * these will report EOPNOTSUPP. we simply ignore these when tallying 1674 * the number of frozen filesystems. 1675 * if a filesystem is mounted more than once (aka bind mount) a 1676 * consecutive attempt to freeze an already frozen filesystem will 1677 * return EBUSY. 1678 * 1679 * any other error means a failure to freeze a filesystem we 1680 * expect to be freezable, so return an error in those cases 1681 * and return system to thawed state. 1682 */ 1683 ret = ioctl(fd, FIFREEZE); 1684 if (ret == -1) { 1685 if (errno != EOPNOTSUPP && errno != EBUSY) { 1686 error_setg_errno(errp, errno, "failed to freeze %s", 1687 mount->dirname); 1688 close(fd); 1689 goto error; 1690 } 1691 } else { 1692 i++; 1693 } 1694 close(fd); 1695 } 1696 1697 free_fs_mount_list(&mounts); 1698 /* We may not issue any FIFREEZE here. 1699 * Just unset ga_state here and ready for the next call. 1700 */ 1701 if (i == 0) { 1702 ga_unset_frozen(ga_state); 1703 } 1704 return i; 1705 1706 error: 1707 free_fs_mount_list(&mounts); 1708 qmp_guest_fsfreeze_thaw(NULL); 1709 return 0; 1710 } 1711 1712 /* 1713 * Walk list of frozen file systems in the guest, and thaw them. 1714 */ 1715 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1716 { 1717 int ret; 1718 FsMountList mounts; 1719 FsMount *mount; 1720 int fd, i = 0, logged; 1721 Error *local_err = NULL; 1722 1723 QTAILQ_INIT(&mounts); 1724 build_fs_mount_list(&mounts, &local_err); 1725 if (local_err) { 1726 error_propagate(errp, local_err); 1727 return 0; 1728 } 1729 1730 QTAILQ_FOREACH(mount, &mounts, next) { 1731 logged = false; 1732 fd = qemu_open_old(mount->dirname, O_RDONLY); 1733 if (fd == -1) { 1734 continue; 1735 } 1736 /* we have no way of knowing whether a filesystem was actually unfrozen 1737 * as a result of a successful call to FITHAW, only that if an error 1738 * was returned the filesystem was *not* unfrozen by that particular 1739 * call. 1740 * 1741 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1742 * to unfreeze, continuing issuing FITHAW until an error is returned, 1743 * in which case either the filesystem is in an unfreezable state, or, 1744 * more likely, it was thawed previously (and remains so afterward). 1745 * 1746 * also, since the most recent successful call is the one that did 1747 * the actual unfreeze, we can use this to provide an accurate count 1748 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1749 * may * be useful for determining whether a filesystem was unfrozen 1750 * during the freeze/thaw phase by a process other than qemu-ga. 1751 */ 1752 do { 1753 ret = ioctl(fd, FITHAW); 1754 if (ret == 0 && !logged) { 1755 i++; 1756 logged = true; 1757 } 1758 } while (ret == 0); 1759 close(fd); 1760 } 1761 1762 ga_unset_frozen(ga_state); 1763 free_fs_mount_list(&mounts); 1764 1765 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1766 1767 return i; 1768 } 1769 1770 static void guest_fsfreeze_cleanup(void) 1771 { 1772 Error *err = NULL; 1773 1774 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1775 qmp_guest_fsfreeze_thaw(&err); 1776 if (err) { 1777 slog("failed to clean up frozen filesystems: %s", 1778 error_get_pretty(err)); 1779 error_free(err); 1780 } 1781 } 1782 } 1783 #endif /* CONFIG_FSFREEZE */ 1784 1785 #if defined(CONFIG_FSTRIM) 1786 /* 1787 * Walk list of mounted file systems in the guest, and trim them. 1788 */ 1789 GuestFilesystemTrimResponse * 1790 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1791 { 1792 GuestFilesystemTrimResponse *response; 1793 GuestFilesystemTrimResult *result; 1794 int ret = 0; 1795 FsMountList mounts; 1796 struct FsMount *mount; 1797 int fd; 1798 Error *local_err = NULL; 1799 struct fstrim_range r; 1800 1801 slog("guest-fstrim called"); 1802 1803 QTAILQ_INIT(&mounts); 1804 build_fs_mount_list(&mounts, &local_err); 1805 if (local_err) { 1806 error_propagate(errp, local_err); 1807 return NULL; 1808 } 1809 1810 response = g_malloc0(sizeof(*response)); 1811 1812 QTAILQ_FOREACH(mount, &mounts, next) { 1813 result = g_malloc0(sizeof(*result)); 1814 result->path = g_strdup(mount->dirname); 1815 1816 QAPI_LIST_PREPEND(response->paths, result); 1817 1818 fd = qemu_open_old(mount->dirname, O_RDONLY); 1819 if (fd == -1) { 1820 result->error = g_strdup_printf("failed to open: %s", 1821 strerror(errno)); 1822 result->has_error = true; 1823 continue; 1824 } 1825 1826 /* We try to cull filesystems we know won't work in advance, but other 1827 * filesystems may not implement fstrim for less obvious reasons. 1828 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1829 * will be reported (e.g. CD-ROMs). 1830 * Any other error means an unexpected error. 1831 */ 1832 r.start = 0; 1833 r.len = -1; 1834 r.minlen = has_minimum ? minimum : 0; 1835 ret = ioctl(fd, FITRIM, &r); 1836 if (ret == -1) { 1837 result->has_error = true; 1838 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1839 result->error = g_strdup("trim not supported"); 1840 } else { 1841 result->error = g_strdup_printf("failed to trim: %s", 1842 strerror(errno)); 1843 } 1844 close(fd); 1845 continue; 1846 } 1847 1848 result->has_minimum = true; 1849 result->minimum = r.minlen; 1850 result->has_trimmed = true; 1851 result->trimmed = r.len; 1852 close(fd); 1853 } 1854 1855 free_fs_mount_list(&mounts); 1856 return response; 1857 } 1858 #endif /* CONFIG_FSTRIM */ 1859 1860 1861 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1862 #define SUSPEND_SUPPORTED 0 1863 #define SUSPEND_NOT_SUPPORTED 1 1864 1865 typedef enum { 1866 SUSPEND_MODE_DISK = 0, 1867 SUSPEND_MODE_RAM = 1, 1868 SUSPEND_MODE_HYBRID = 2, 1869 } SuspendMode; 1870 1871 /* 1872 * Executes a command in a child process using g_spawn_sync, 1873 * returning an int >= 0 representing the exit status of the 1874 * process. 1875 * 1876 * If the program wasn't found in path, returns -1. 1877 * 1878 * If a problem happened when creating the child process, 1879 * returns -1 and errp is set. 1880 */ 1881 static int run_process_child(const char *command[], Error **errp) 1882 { 1883 int exit_status, spawn_flag; 1884 GError *g_err = NULL; 1885 bool success; 1886 1887 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1888 G_SPAWN_STDERR_TO_DEV_NULL; 1889 1890 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1891 NULL, NULL, NULL, NULL, 1892 &exit_status, &g_err); 1893 1894 if (success) { 1895 return WEXITSTATUS(exit_status); 1896 } 1897 1898 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1899 error_setg(errp, "failed to create child process, error '%s'", 1900 g_err->message); 1901 } 1902 1903 g_error_free(g_err); 1904 return -1; 1905 } 1906 1907 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1908 { 1909 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1910 "systemd-hybrid-sleep"}; 1911 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1912 int status; 1913 1914 status = run_process_child(cmd, errp); 1915 1916 /* 1917 * systemctl status uses LSB return codes so we can expect 1918 * status > 0 and be ok. To assert if the guest has support 1919 * for the selected suspend mode, status should be < 4. 4 is 1920 * the code for unknown service status, the return value when 1921 * the service does not exist. A common value is status = 3 1922 * (program is not running). 1923 */ 1924 if (status > 0 && status < 4) { 1925 return true; 1926 } 1927 1928 return false; 1929 } 1930 1931 static void systemd_suspend(SuspendMode mode, Error **errp) 1932 { 1933 Error *local_err = NULL; 1934 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1935 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1936 int status; 1937 1938 status = run_process_child(cmd, &local_err); 1939 1940 if (status == 0) { 1941 return; 1942 } 1943 1944 if ((status == -1) && !local_err) { 1945 error_setg(errp, "the helper program 'systemctl %s' was not found", 1946 systemctl_args[mode]); 1947 return; 1948 } 1949 1950 if (local_err) { 1951 error_propagate(errp, local_err); 1952 } else { 1953 error_setg(errp, "the helper program 'systemctl %s' returned an " 1954 "unexpected exit status code (%d)", 1955 systemctl_args[mode], status); 1956 } 1957 } 1958 1959 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1960 { 1961 Error *local_err = NULL; 1962 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1963 "--suspend-hybrid"}; 1964 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1965 int status; 1966 1967 status = run_process_child(cmd, &local_err); 1968 1969 if (status == SUSPEND_SUPPORTED) { 1970 return true; 1971 } 1972 1973 if ((status == -1) && !local_err) { 1974 return false; 1975 } 1976 1977 if (local_err) { 1978 error_propagate(errp, local_err); 1979 } else { 1980 error_setg(errp, 1981 "the helper program '%s' returned an unexpected exit" 1982 " status code (%d)", "pm-is-supported", status); 1983 } 1984 1985 return false; 1986 } 1987 1988 static void pmutils_suspend(SuspendMode mode, Error **errp) 1989 { 1990 Error *local_err = NULL; 1991 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1992 "pm-suspend-hybrid"}; 1993 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1994 int status; 1995 1996 status = run_process_child(cmd, &local_err); 1997 1998 if (status == 0) { 1999 return; 2000 } 2001 2002 if ((status == -1) && !local_err) { 2003 error_setg(errp, "the helper program '%s' was not found", 2004 pmutils_binaries[mode]); 2005 return; 2006 } 2007 2008 if (local_err) { 2009 error_propagate(errp, local_err); 2010 } else { 2011 error_setg(errp, 2012 "the helper program '%s' returned an unexpected exit" 2013 " status code (%d)", pmutils_binaries[mode], status); 2014 } 2015 } 2016 2017 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 2018 { 2019 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2020 const char *sysfile_str = sysfile_strs[mode]; 2021 char buf[32]; /* hopefully big enough */ 2022 int fd; 2023 ssize_t ret; 2024 2025 if (!sysfile_str) { 2026 error_setg(errp, "unknown guest suspend mode"); 2027 return false; 2028 } 2029 2030 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 2031 if (fd < 0) { 2032 return false; 2033 } 2034 2035 ret = read(fd, buf, sizeof(buf) - 1); 2036 close(fd); 2037 if (ret <= 0) { 2038 return false; 2039 } 2040 buf[ret] = '\0'; 2041 2042 if (strstr(buf, sysfile_str)) { 2043 return true; 2044 } 2045 return false; 2046 } 2047 2048 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 2049 { 2050 Error *local_err = NULL; 2051 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2052 const char *sysfile_str = sysfile_strs[mode]; 2053 pid_t pid; 2054 int status; 2055 2056 if (!sysfile_str) { 2057 error_setg(errp, "unknown guest suspend mode"); 2058 return; 2059 } 2060 2061 pid = fork(); 2062 if (!pid) { 2063 /* child */ 2064 int fd; 2065 2066 setsid(); 2067 reopen_fd_to_null(0); 2068 reopen_fd_to_null(1); 2069 reopen_fd_to_null(2); 2070 2071 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 2072 if (fd < 0) { 2073 _exit(EXIT_FAILURE); 2074 } 2075 2076 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 2077 _exit(EXIT_FAILURE); 2078 } 2079 2080 _exit(EXIT_SUCCESS); 2081 } else if (pid < 0) { 2082 error_setg_errno(errp, errno, "failed to create child process"); 2083 return; 2084 } 2085 2086 ga_wait_child(pid, &status, &local_err); 2087 if (local_err) { 2088 error_propagate(errp, local_err); 2089 return; 2090 } 2091 2092 if (WEXITSTATUS(status)) { 2093 error_setg(errp, "child process has failed to suspend"); 2094 } 2095 2096 } 2097 2098 static void guest_suspend(SuspendMode mode, Error **errp) 2099 { 2100 Error *local_err = NULL; 2101 bool mode_supported = false; 2102 2103 if (systemd_supports_mode(mode, &local_err)) { 2104 mode_supported = true; 2105 systemd_suspend(mode, &local_err); 2106 } 2107 2108 if (!local_err) { 2109 return; 2110 } 2111 2112 error_free(local_err); 2113 local_err = NULL; 2114 2115 if (pmutils_supports_mode(mode, &local_err)) { 2116 mode_supported = true; 2117 pmutils_suspend(mode, &local_err); 2118 } 2119 2120 if (!local_err) { 2121 return; 2122 } 2123 2124 error_free(local_err); 2125 local_err = NULL; 2126 2127 if (linux_sys_state_supports_mode(mode, &local_err)) { 2128 mode_supported = true; 2129 linux_sys_state_suspend(mode, &local_err); 2130 } 2131 2132 if (!mode_supported) { 2133 error_free(local_err); 2134 error_setg(errp, 2135 "the requested suspend mode is not supported by the guest"); 2136 } else { 2137 error_propagate(errp, local_err); 2138 } 2139 } 2140 2141 void qmp_guest_suspend_disk(Error **errp) 2142 { 2143 guest_suspend(SUSPEND_MODE_DISK, errp); 2144 } 2145 2146 void qmp_guest_suspend_ram(Error **errp) 2147 { 2148 guest_suspend(SUSPEND_MODE_RAM, errp); 2149 } 2150 2151 void qmp_guest_suspend_hybrid(Error **errp) 2152 { 2153 guest_suspend(SUSPEND_MODE_HYBRID, errp); 2154 } 2155 2156 static GuestNetworkInterface * 2157 guest_find_interface(GuestNetworkInterfaceList *head, 2158 const char *name) 2159 { 2160 for (; head; head = head->next) { 2161 if (strcmp(head->value->name, name) == 0) { 2162 return head->value; 2163 } 2164 } 2165 2166 return NULL; 2167 } 2168 2169 static int guest_get_network_stats(const char *name, 2170 GuestNetworkInterfaceStat *stats) 2171 { 2172 int name_len; 2173 char const *devinfo = "/proc/net/dev"; 2174 FILE *fp; 2175 char *line = NULL, *colon; 2176 size_t n = 0; 2177 fp = fopen(devinfo, "r"); 2178 if (!fp) { 2179 return -1; 2180 } 2181 name_len = strlen(name); 2182 while (getline(&line, &n, fp) != -1) { 2183 long long dummy; 2184 long long rx_bytes; 2185 long long rx_packets; 2186 long long rx_errs; 2187 long long rx_dropped; 2188 long long tx_bytes; 2189 long long tx_packets; 2190 long long tx_errs; 2191 long long tx_dropped; 2192 char *trim_line; 2193 trim_line = g_strchug(line); 2194 if (trim_line[0] == '\0') { 2195 continue; 2196 } 2197 colon = strchr(trim_line, ':'); 2198 if (!colon) { 2199 continue; 2200 } 2201 if (colon - name_len == trim_line && 2202 strncmp(trim_line, name, name_len) == 0) { 2203 if (sscanf(colon + 1, 2204 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 2205 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 2206 &dummy, &dummy, &dummy, &dummy, 2207 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 2208 &dummy, &dummy, &dummy, &dummy) != 16) { 2209 continue; 2210 } 2211 stats->rx_bytes = rx_bytes; 2212 stats->rx_packets = rx_packets; 2213 stats->rx_errs = rx_errs; 2214 stats->rx_dropped = rx_dropped; 2215 stats->tx_bytes = tx_bytes; 2216 stats->tx_packets = tx_packets; 2217 stats->tx_errs = tx_errs; 2218 stats->tx_dropped = tx_dropped; 2219 fclose(fp); 2220 g_free(line); 2221 return 0; 2222 } 2223 } 2224 fclose(fp); 2225 g_free(line); 2226 g_debug("/proc/net/dev: Interface '%s' not found", name); 2227 return -1; 2228 } 2229 2230 /* 2231 * Build information about guest interfaces 2232 */ 2233 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2234 { 2235 GuestNetworkInterfaceList *head = NULL, **tail = &head; 2236 struct ifaddrs *ifap, *ifa; 2237 2238 if (getifaddrs(&ifap) < 0) { 2239 error_setg_errno(errp, errno, "getifaddrs failed"); 2240 goto error; 2241 } 2242 2243 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2244 GuestNetworkInterface *info; 2245 GuestIpAddressList **address_tail; 2246 GuestIpAddress *address_item = NULL; 2247 GuestNetworkInterfaceStat *interface_stat = NULL; 2248 char addr4[INET_ADDRSTRLEN]; 2249 char addr6[INET6_ADDRSTRLEN]; 2250 int sock; 2251 struct ifreq ifr; 2252 unsigned char *mac_addr; 2253 void *p; 2254 2255 g_debug("Processing %s interface", ifa->ifa_name); 2256 2257 info = guest_find_interface(head, ifa->ifa_name); 2258 2259 if (!info) { 2260 info = g_malloc0(sizeof(*info)); 2261 info->name = g_strdup(ifa->ifa_name); 2262 2263 QAPI_LIST_APPEND(tail, info); 2264 } 2265 2266 if (!info->has_hardware_address && ifa->ifa_flags & SIOCGIFHWADDR) { 2267 /* we haven't obtained HW address yet */ 2268 sock = socket(PF_INET, SOCK_STREAM, 0); 2269 if (sock == -1) { 2270 error_setg_errno(errp, errno, "failed to create socket"); 2271 goto error; 2272 } 2273 2274 memset(&ifr, 0, sizeof(ifr)); 2275 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->name); 2276 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 2277 error_setg_errno(errp, errno, 2278 "failed to get MAC address of %s", 2279 ifa->ifa_name); 2280 close(sock); 2281 goto error; 2282 } 2283 2284 close(sock); 2285 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 2286 2287 info->hardware_address = 2288 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2289 (int) mac_addr[0], (int) mac_addr[1], 2290 (int) mac_addr[2], (int) mac_addr[3], 2291 (int) mac_addr[4], (int) mac_addr[5]); 2292 2293 info->has_hardware_address = true; 2294 } 2295 2296 if (ifa->ifa_addr && 2297 ifa->ifa_addr->sa_family == AF_INET) { 2298 /* interface with IPv4 address */ 2299 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2300 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2301 error_setg_errno(errp, errno, "inet_ntop failed"); 2302 goto error; 2303 } 2304 2305 address_item = g_malloc0(sizeof(*address_item)); 2306 address_item->ip_address = g_strdup(addr4); 2307 address_item->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2308 2309 if (ifa->ifa_netmask) { 2310 /* Count the number of set bits in netmask. 2311 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2312 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2313 address_item->prefix = ctpop32(((uint32_t *) p)[0]); 2314 } 2315 } else if (ifa->ifa_addr && 2316 ifa->ifa_addr->sa_family == AF_INET6) { 2317 /* interface with IPv6 address */ 2318 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2319 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2320 error_setg_errno(errp, errno, "inet_ntop failed"); 2321 goto error; 2322 } 2323 2324 address_item = g_malloc0(sizeof(*address_item)); 2325 address_item->ip_address = g_strdup(addr6); 2326 address_item->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2327 2328 if (ifa->ifa_netmask) { 2329 /* Count the number of set bits in netmask. 2330 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2331 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2332 address_item->prefix = 2333 ctpop32(((uint32_t *) p)[0]) + 2334 ctpop32(((uint32_t *) p)[1]) + 2335 ctpop32(((uint32_t *) p)[2]) + 2336 ctpop32(((uint32_t *) p)[3]); 2337 } 2338 } 2339 2340 if (!address_item) { 2341 continue; 2342 } 2343 2344 address_tail = &info->ip_addresses; 2345 while (*address_tail) { 2346 address_tail = &(*address_tail)->next; 2347 } 2348 QAPI_LIST_APPEND(address_tail, address_item); 2349 2350 info->has_ip_addresses = true; 2351 2352 if (!info->has_statistics) { 2353 interface_stat = g_malloc0(sizeof(*interface_stat)); 2354 if (guest_get_network_stats(info->name, interface_stat) == -1) { 2355 info->has_statistics = false; 2356 g_free(interface_stat); 2357 } else { 2358 info->statistics = interface_stat; 2359 info->has_statistics = true; 2360 } 2361 } 2362 } 2363 2364 freeifaddrs(ifap); 2365 return head; 2366 2367 error: 2368 freeifaddrs(ifap); 2369 qapi_free_GuestNetworkInterfaceList(head); 2370 return NULL; 2371 } 2372 2373 /* Transfer online/offline status between @vcpu and the guest system. 2374 * 2375 * On input either @errp or *@errp must be NULL. 2376 * 2377 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2378 * - R: vcpu->logical_id 2379 * - W: vcpu->online 2380 * - W: vcpu->can_offline 2381 * 2382 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2383 * - R: vcpu->logical_id 2384 * - R: vcpu->online 2385 * 2386 * Written members remain unmodified on error. 2387 */ 2388 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2389 char *dirpath, Error **errp) 2390 { 2391 int fd; 2392 int res; 2393 int dirfd; 2394 static const char fn[] = "online"; 2395 2396 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2397 if (dirfd == -1) { 2398 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2399 return; 2400 } 2401 2402 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2403 if (fd == -1) { 2404 if (errno != ENOENT) { 2405 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2406 } else if (sys2vcpu) { 2407 vcpu->online = true; 2408 vcpu->can_offline = false; 2409 } else if (!vcpu->online) { 2410 error_setg(errp, "logical processor #%" PRId64 " can't be " 2411 "offlined", vcpu->logical_id); 2412 } /* otherwise pretend successful re-onlining */ 2413 } else { 2414 unsigned char status; 2415 2416 res = pread(fd, &status, 1, 0); 2417 if (res == -1) { 2418 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2419 } else if (res == 0) { 2420 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2421 fn); 2422 } else if (sys2vcpu) { 2423 vcpu->online = (status != '0'); 2424 vcpu->can_offline = true; 2425 } else if (vcpu->online != (status != '0')) { 2426 status = '0' + vcpu->online; 2427 if (pwrite(fd, &status, 1, 0) == -1) { 2428 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2429 fn); 2430 } 2431 } /* otherwise pretend successful re-(on|off)-lining */ 2432 2433 res = close(fd); 2434 g_assert(res == 0); 2435 } 2436 2437 res = close(dirfd); 2438 g_assert(res == 0); 2439 } 2440 2441 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2442 { 2443 GuestLogicalProcessorList *head, **tail; 2444 const char *cpu_dir = "/sys/devices/system/cpu"; 2445 const gchar *line; 2446 g_autoptr(GDir) cpu_gdir = NULL; 2447 Error *local_err = NULL; 2448 2449 head = NULL; 2450 tail = &head; 2451 cpu_gdir = g_dir_open(cpu_dir, 0, NULL); 2452 2453 if (cpu_gdir == NULL) { 2454 error_setg_errno(errp, errno, "failed to list entries: %s", cpu_dir); 2455 return NULL; 2456 } 2457 2458 while (local_err == NULL && (line = g_dir_read_name(cpu_gdir)) != NULL) { 2459 GuestLogicalProcessor *vcpu; 2460 int64_t id; 2461 if (sscanf(line, "cpu%" PRId64, &id)) { 2462 g_autofree char *path = g_strdup_printf("/sys/devices/system/cpu/" 2463 "cpu%" PRId64 "/", id); 2464 vcpu = g_malloc0(sizeof *vcpu); 2465 vcpu->logical_id = id; 2466 vcpu->has_can_offline = true; /* lolspeak ftw */ 2467 transfer_vcpu(vcpu, true, path, &local_err); 2468 QAPI_LIST_APPEND(tail, vcpu); 2469 } 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, **tail; 2801 Error *local_err = NULL; 2802 struct dirent *de; 2803 DIR *dp; 2804 2805 head = NULL; 2806 tail = &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 2829 if ((strncmp(de->d_name, "memory", 6) != 0) || 2830 !(de->d_type & DT_DIR)) { 2831 continue; 2832 } 2833 2834 mem_blk = g_malloc0(sizeof *mem_blk); 2835 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2836 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2837 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2838 transfer_memory_block(mem_blk, true, NULL, &local_err); 2839 if (local_err) { 2840 break; 2841 } 2842 2843 QAPI_LIST_APPEND(tail, mem_blk); 2844 } 2845 2846 closedir(dp); 2847 if (local_err == NULL) { 2848 /* there's no guest with zero memory blocks */ 2849 if (head == NULL) { 2850 error_setg(errp, "guest reported zero memory blocks!"); 2851 } 2852 return head; 2853 } 2854 2855 qapi_free_GuestMemoryBlockList(head); 2856 error_propagate(errp, local_err); 2857 return NULL; 2858 } 2859 2860 GuestMemoryBlockResponseList * 2861 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2862 { 2863 GuestMemoryBlockResponseList *head, **tail; 2864 Error *local_err = NULL; 2865 2866 head = NULL; 2867 tail = &head; 2868 2869 while (mem_blks != NULL) { 2870 GuestMemoryBlockResponse *result; 2871 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2872 2873 result = g_malloc0(sizeof(*result)); 2874 result->phys_index = current_mem_blk->phys_index; 2875 transfer_memory_block(current_mem_blk, false, result, &local_err); 2876 if (local_err) { /* should never happen */ 2877 goto err; 2878 } 2879 2880 QAPI_LIST_APPEND(tail, result); 2881 mem_blks = mem_blks->next; 2882 } 2883 2884 return head; 2885 err: 2886 qapi_free_GuestMemoryBlockResponseList(head); 2887 error_propagate(errp, local_err); 2888 return NULL; 2889 } 2890 2891 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2892 { 2893 Error *local_err = NULL; 2894 char *dirpath; 2895 int dirfd; 2896 char *buf; 2897 GuestMemoryBlockInfo *info; 2898 2899 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2900 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2901 if (dirfd == -1) { 2902 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2903 g_free(dirpath); 2904 return NULL; 2905 } 2906 g_free(dirpath); 2907 2908 buf = g_malloc0(20); 2909 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2910 close(dirfd); 2911 if (local_err) { 2912 g_free(buf); 2913 error_propagate(errp, local_err); 2914 return NULL; 2915 } 2916 2917 info = g_new0(GuestMemoryBlockInfo, 1); 2918 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2919 2920 g_free(buf); 2921 2922 return info; 2923 } 2924 2925 #else /* defined(__linux__) */ 2926 2927 void qmp_guest_suspend_disk(Error **errp) 2928 { 2929 error_setg(errp, QERR_UNSUPPORTED); 2930 } 2931 2932 void qmp_guest_suspend_ram(Error **errp) 2933 { 2934 error_setg(errp, QERR_UNSUPPORTED); 2935 } 2936 2937 void qmp_guest_suspend_hybrid(Error **errp) 2938 { 2939 error_setg(errp, QERR_UNSUPPORTED); 2940 } 2941 2942 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2943 { 2944 error_setg(errp, QERR_UNSUPPORTED); 2945 return NULL; 2946 } 2947 2948 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2949 { 2950 error_setg(errp, QERR_UNSUPPORTED); 2951 return NULL; 2952 } 2953 2954 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2955 { 2956 error_setg(errp, QERR_UNSUPPORTED); 2957 return -1; 2958 } 2959 2960 void qmp_guest_set_user_password(const char *username, 2961 const char *password, 2962 bool crypted, 2963 Error **errp) 2964 { 2965 error_setg(errp, QERR_UNSUPPORTED); 2966 } 2967 2968 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2969 { 2970 error_setg(errp, QERR_UNSUPPORTED); 2971 return NULL; 2972 } 2973 2974 GuestMemoryBlockResponseList * 2975 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2976 { 2977 error_setg(errp, QERR_UNSUPPORTED); 2978 return NULL; 2979 } 2980 2981 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2982 { 2983 error_setg(errp, QERR_UNSUPPORTED); 2984 return NULL; 2985 } 2986 2987 #endif 2988 2989 #if !defined(CONFIG_FSFREEZE) 2990 2991 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 2992 { 2993 error_setg(errp, QERR_UNSUPPORTED); 2994 return NULL; 2995 } 2996 2997 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 2998 { 2999 error_setg(errp, QERR_UNSUPPORTED); 3000 3001 return 0; 3002 } 3003 3004 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 3005 { 3006 error_setg(errp, QERR_UNSUPPORTED); 3007 3008 return 0; 3009 } 3010 3011 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 3012 strList *mountpoints, 3013 Error **errp) 3014 { 3015 error_setg(errp, QERR_UNSUPPORTED); 3016 3017 return 0; 3018 } 3019 3020 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 3021 { 3022 error_setg(errp, QERR_UNSUPPORTED); 3023 3024 return 0; 3025 } 3026 3027 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 3028 { 3029 error_setg(errp, QERR_UNSUPPORTED); 3030 return NULL; 3031 } 3032 3033 #endif /* CONFIG_FSFREEZE */ 3034 3035 #if !defined(CONFIG_FSTRIM) 3036 GuestFilesystemTrimResponse * 3037 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 3038 { 3039 error_setg(errp, QERR_UNSUPPORTED); 3040 return NULL; 3041 } 3042 #endif 3043 3044 /* add unsupported commands to the blacklist */ 3045 GList *ga_command_blacklist_init(GList *blacklist) 3046 { 3047 #if !defined(__linux__) 3048 { 3049 const char *list[] = { 3050 "guest-suspend-disk", "guest-suspend-ram", 3051 "guest-suspend-hybrid", "guest-network-get-interfaces", 3052 "guest-get-vcpus", "guest-set-vcpus", 3053 "guest-get-memory-blocks", "guest-set-memory-blocks", 3054 "guest-get-memory-block-size", "guest-get-memory-block-info", 3055 NULL}; 3056 char **p = (char **)list; 3057 3058 while (*p) { 3059 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3060 } 3061 } 3062 #endif 3063 3064 #if !defined(CONFIG_FSFREEZE) 3065 { 3066 const char *list[] = { 3067 "guest-get-fsinfo", "guest-fsfreeze-status", 3068 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 3069 "guest-fsfreeze-thaw", "guest-get-fsinfo", 3070 "guest-get-disks", NULL}; 3071 char **p = (char **)list; 3072 3073 while (*p) { 3074 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3075 } 3076 } 3077 #endif 3078 3079 #if !defined(CONFIG_FSTRIM) 3080 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 3081 #endif 3082 3083 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 3084 3085 return blacklist; 3086 } 3087 3088 /* register init/cleanup routines for stateful command groups */ 3089 void ga_command_state_init(GAState *s, GACommandState *cs) 3090 { 3091 #if defined(CONFIG_FSFREEZE) 3092 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 3093 #endif 3094 } 3095 3096 #ifdef HAVE_UTMPX 3097 3098 #define QGA_MICRO_SECOND_TO_SECOND 1000000 3099 3100 static double ga_get_login_time(struct utmpx *user_info) 3101 { 3102 double seconds = (double)user_info->ut_tv.tv_sec; 3103 double useconds = (double)user_info->ut_tv.tv_usec; 3104 useconds /= QGA_MICRO_SECOND_TO_SECOND; 3105 return seconds + useconds; 3106 } 3107 3108 GuestUserList *qmp_guest_get_users(Error **errp) 3109 { 3110 GHashTable *cache = NULL; 3111 GuestUserList *head = NULL, **tail = &head; 3112 struct utmpx *user_info = NULL; 3113 gpointer value = NULL; 3114 GuestUser *user = NULL; 3115 double login_time = 0; 3116 3117 cache = g_hash_table_new(g_str_hash, g_str_equal); 3118 setutxent(); 3119 3120 for (;;) { 3121 user_info = getutxent(); 3122 if (user_info == NULL) { 3123 break; 3124 } else if (user_info->ut_type != USER_PROCESS) { 3125 continue; 3126 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 3127 value = g_hash_table_lookup(cache, user_info->ut_user); 3128 user = (GuestUser *)value; 3129 login_time = ga_get_login_time(user_info); 3130 /* We're ensuring the earliest login time to be sent */ 3131 if (login_time < user->login_time) { 3132 user->login_time = login_time; 3133 } 3134 continue; 3135 } 3136 3137 user = g_new0(GuestUser, 1); 3138 user->user = g_strdup(user_info->ut_user); 3139 user->login_time = ga_get_login_time(user_info); 3140 3141 g_hash_table_insert(cache, user->user, user); 3142 3143 QAPI_LIST_APPEND(tail, user); 3144 } 3145 endutxent(); 3146 g_hash_table_destroy(cache); 3147 return head; 3148 } 3149 3150 #else 3151 3152 GuestUserList *qmp_guest_get_users(Error **errp) 3153 { 3154 error_setg(errp, QERR_UNSUPPORTED); 3155 return NULL; 3156 } 3157 3158 #endif 3159 3160 /* Replace escaped special characters with theire real values. The replacement 3161 * is done in place -- returned value is in the original string. 3162 */ 3163 static void ga_osrelease_replace_special(gchar *value) 3164 { 3165 gchar *p, *p2, quote; 3166 3167 /* Trim the string at first space or semicolon if it is not enclosed in 3168 * single or double quotes. */ 3169 if ((value[0] != '"') || (value[0] == '\'')) { 3170 p = strchr(value, ' '); 3171 if (p != NULL) { 3172 *p = 0; 3173 } 3174 p = strchr(value, ';'); 3175 if (p != NULL) { 3176 *p = 0; 3177 } 3178 return; 3179 } 3180 3181 quote = value[0]; 3182 p2 = value; 3183 p = value + 1; 3184 while (*p != 0) { 3185 if (*p == '\\') { 3186 p++; 3187 switch (*p) { 3188 case '$': 3189 case '\'': 3190 case '"': 3191 case '\\': 3192 case '`': 3193 break; 3194 default: 3195 /* Keep literal backslash followed by whatever is there */ 3196 p--; 3197 break; 3198 } 3199 } else if (*p == quote) { 3200 *p2 = 0; 3201 break; 3202 } 3203 *(p2++) = *(p++); 3204 } 3205 } 3206 3207 static GKeyFile *ga_parse_osrelease(const char *fname) 3208 { 3209 gchar *content = NULL; 3210 gchar *content2 = NULL; 3211 GError *err = NULL; 3212 GKeyFile *keys = g_key_file_new(); 3213 const char *group = "[os-release]\n"; 3214 3215 if (!g_file_get_contents(fname, &content, NULL, &err)) { 3216 slog("failed to read '%s', error: %s", fname, err->message); 3217 goto fail; 3218 } 3219 3220 if (!g_utf8_validate(content, -1, NULL)) { 3221 slog("file is not utf-8 encoded: %s", fname); 3222 goto fail; 3223 } 3224 content2 = g_strdup_printf("%s%s", group, content); 3225 3226 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 3227 &err)) { 3228 slog("failed to parse file '%s', error: %s", fname, err->message); 3229 goto fail; 3230 } 3231 3232 g_free(content); 3233 g_free(content2); 3234 return keys; 3235 3236 fail: 3237 g_error_free(err); 3238 g_free(content); 3239 g_free(content2); 3240 g_key_file_free(keys); 3241 return NULL; 3242 } 3243 3244 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 3245 { 3246 GuestOSInfo *info = NULL; 3247 struct utsname kinfo; 3248 GKeyFile *osrelease = NULL; 3249 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 3250 3251 info = g_new0(GuestOSInfo, 1); 3252 3253 if (uname(&kinfo) != 0) { 3254 error_setg_errno(errp, errno, "uname failed"); 3255 } else { 3256 info->has_kernel_version = true; 3257 info->kernel_version = g_strdup(kinfo.version); 3258 info->has_kernel_release = true; 3259 info->kernel_release = g_strdup(kinfo.release); 3260 info->has_machine = true; 3261 info->machine = g_strdup(kinfo.machine); 3262 } 3263 3264 if (qga_os_release != NULL) { 3265 osrelease = ga_parse_osrelease(qga_os_release); 3266 } else { 3267 osrelease = ga_parse_osrelease("/etc/os-release"); 3268 if (osrelease == NULL) { 3269 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3270 } 3271 } 3272 3273 if (osrelease != NULL) { 3274 char *value; 3275 3276 #define GET_FIELD(field, osfield) do { \ 3277 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3278 if (value != NULL) { \ 3279 ga_osrelease_replace_special(value); \ 3280 info->has_ ## field = true; \ 3281 info->field = value; \ 3282 } \ 3283 } while (0) 3284 GET_FIELD(id, "ID"); 3285 GET_FIELD(name, "NAME"); 3286 GET_FIELD(pretty_name, "PRETTY_NAME"); 3287 GET_FIELD(version, "VERSION"); 3288 GET_FIELD(version_id, "VERSION_ID"); 3289 GET_FIELD(variant, "VARIANT"); 3290 GET_FIELD(variant_id, "VARIANT_ID"); 3291 #undef GET_FIELD 3292 3293 g_key_file_free(osrelease); 3294 } 3295 3296 return info; 3297 } 3298 3299 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3300 { 3301 error_setg(errp, QERR_UNSUPPORTED); 3302 3303 return NULL; 3304 } 3305