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 static bool is_disk_virtual(const char *devpath, Error **errp) 1154 { 1155 g_autofree char *syspath = realpath(devpath, NULL); 1156 1157 if (!syspath) { 1158 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1159 return false; 1160 } 1161 return strstr(syspath, "/devices/virtual/block/") != NULL; 1162 } 1163 1164 /* Dispatch to functions for virtual/real device */ 1165 static void build_guest_fsinfo_for_device(char const *devpath, 1166 GuestFilesystemInfo *fs, 1167 Error **errp) 1168 { 1169 ERRP_GUARD(); 1170 g_autofree char *syspath = NULL; 1171 bool is_virtual = false; 1172 1173 syspath = realpath(devpath, NULL); 1174 if (!syspath) { 1175 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1176 return; 1177 } 1178 1179 if (!fs->name) { 1180 fs->name = g_path_get_basename(syspath); 1181 } 1182 1183 g_debug(" parse sysfs path '%s'", syspath); 1184 is_virtual = is_disk_virtual(syspath, errp); 1185 if (*errp != NULL) { 1186 return; 1187 } 1188 if (is_virtual) { 1189 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1190 } else { 1191 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1192 } 1193 } 1194 1195 #ifdef CONFIG_LIBUDEV 1196 1197 /* 1198 * Wrapper around build_guest_fsinfo_for_device() for getting just 1199 * the disk address. 1200 */ 1201 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp) 1202 { 1203 g_autoptr(GuestFilesystemInfo) fs = NULL; 1204 1205 fs = g_new0(GuestFilesystemInfo, 1); 1206 build_guest_fsinfo_for_device(syspath, fs, errp); 1207 if (fs->disk != NULL) { 1208 return g_steal_pointer(&fs->disk->value); 1209 } 1210 return NULL; 1211 } 1212 1213 static char *get_alias_for_syspath(const char *syspath) 1214 { 1215 struct udev *udev = NULL; 1216 struct udev_device *udevice = NULL; 1217 char *ret = NULL; 1218 1219 udev = udev_new(); 1220 if (udev == NULL) { 1221 g_debug("failed to query udev"); 1222 goto out; 1223 } 1224 udevice = udev_device_new_from_syspath(udev, syspath); 1225 if (udevice == NULL) { 1226 g_debug("failed to query udev for path: %s", syspath); 1227 goto out; 1228 } else { 1229 const char *alias = udev_device_get_property_value( 1230 udevice, "DM_NAME"); 1231 /* 1232 * NULL means there was an error and empty string means there is no 1233 * alias. In case of no alias we return NULL instead of empty string. 1234 */ 1235 if (alias == NULL) { 1236 g_debug("failed to query udev for device alias for: %s", 1237 syspath); 1238 } else if (*alias != 0) { 1239 ret = g_strdup(alias); 1240 } 1241 } 1242 1243 out: 1244 udev_unref(udev); 1245 udev_device_unref(udevice); 1246 return ret; 1247 } 1248 1249 static char *get_device_for_syspath(const char *syspath) 1250 { 1251 struct udev *udev = NULL; 1252 struct udev_device *udevice = NULL; 1253 char *ret = NULL; 1254 1255 udev = udev_new(); 1256 if (udev == NULL) { 1257 g_debug("failed to query udev"); 1258 goto out; 1259 } 1260 udevice = udev_device_new_from_syspath(udev, syspath); 1261 if (udevice == NULL) { 1262 g_debug("failed to query udev for path: %s", syspath); 1263 goto out; 1264 } else { 1265 ret = g_strdup(udev_device_get_devnode(udevice)); 1266 } 1267 1268 out: 1269 udev_unref(udev); 1270 udev_device_unref(udevice); 1271 return ret; 1272 } 1273 1274 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk) 1275 { 1276 g_autofree char *deps_dir = NULL; 1277 const gchar *dep; 1278 GDir *dp_deps = NULL; 1279 1280 /* List dependent disks */ 1281 deps_dir = g_strdup_printf("%s/slaves", disk_dir); 1282 g_debug(" listing entries in: %s", deps_dir); 1283 dp_deps = g_dir_open(deps_dir, 0, NULL); 1284 if (dp_deps == NULL) { 1285 g_debug("failed to list entries in %s", deps_dir); 1286 return; 1287 } 1288 while ((dep = g_dir_read_name(dp_deps)) != NULL) { 1289 g_autofree char *dep_dir = NULL; 1290 strList *dep_item = NULL; 1291 char *dev_name; 1292 1293 /* Add dependent disks */ 1294 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep); 1295 dev_name = get_device_for_syspath(dep_dir); 1296 if (dev_name != NULL) { 1297 g_debug(" adding dependent device: %s", dev_name); 1298 dep_item = g_new0(strList, 1); 1299 dep_item->value = dev_name; 1300 dep_item->next = disk->dependents; 1301 disk->dependents = dep_item; 1302 } 1303 } 1304 g_dir_close(dp_deps); 1305 } 1306 1307 /* 1308 * Detect partitions subdirectory, name is "<disk_name><number>" or 1309 * "<disk_name>p<number>" 1310 * 1311 * @disk_name -- last component of /sys path (e.g. sda) 1312 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda) 1313 * @disk_dev -- device node of the disk (e.g. /dev/sda) 1314 */ 1315 static GuestDiskInfoList *get_disk_partitions( 1316 GuestDiskInfoList *list, 1317 const char *disk_name, const char *disk_dir, 1318 const char *disk_dev) 1319 { 1320 GuestDiskInfoList *item, *ret = list; 1321 struct dirent *de_disk; 1322 DIR *dp_disk = NULL; 1323 size_t len = strlen(disk_name); 1324 1325 dp_disk = opendir(disk_dir); 1326 while ((de_disk = readdir(dp_disk)) != NULL) { 1327 g_autofree char *partition_dir = NULL; 1328 char *dev_name; 1329 GuestDiskInfo *partition; 1330 1331 if (!(de_disk->d_type & DT_DIR)) { 1332 continue; 1333 } 1334 1335 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 && 1336 ((*(de_disk->d_name + len) == 'p' && 1337 isdigit(*(de_disk->d_name + len + 1))) || 1338 isdigit(*(de_disk->d_name + len))))) { 1339 continue; 1340 } 1341 1342 partition_dir = g_strdup_printf("%s/%s", 1343 disk_dir, de_disk->d_name); 1344 dev_name = get_device_for_syspath(partition_dir); 1345 if (dev_name == NULL) { 1346 g_debug("Failed to get device name for syspath: %s", 1347 disk_dir); 1348 continue; 1349 } 1350 partition = g_new0(GuestDiskInfo, 1); 1351 partition->name = dev_name; 1352 partition->partition = true; 1353 /* Add parent disk as dependent for easier tracking of hierarchy */ 1354 partition->dependents = g_new0(strList, 1); 1355 partition->dependents->value = g_strdup(disk_dev); 1356 1357 item = g_new0(GuestDiskInfoList, 1); 1358 item->value = partition; 1359 item->next = ret; 1360 ret = item; 1361 1362 } 1363 closedir(dp_disk); 1364 1365 return ret; 1366 } 1367 1368 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1369 { 1370 GuestDiskInfoList *item, *ret = NULL; 1371 GuestDiskInfo *disk; 1372 DIR *dp = NULL; 1373 struct dirent *de = NULL; 1374 1375 g_debug("listing /sys/block directory"); 1376 dp = opendir("/sys/block"); 1377 if (dp == NULL) { 1378 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\""); 1379 return NULL; 1380 } 1381 while ((de = readdir(dp)) != NULL) { 1382 g_autofree char *disk_dir = NULL, *line = NULL, 1383 *size_path = NULL; 1384 char *dev_name; 1385 Error *local_err = NULL; 1386 if (de->d_type != DT_LNK) { 1387 g_debug(" skipping entry: %s", de->d_name); 1388 continue; 1389 } 1390 1391 /* Check size and skip zero-sized disks */ 1392 g_debug(" checking disk size"); 1393 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name); 1394 if (!g_file_get_contents(size_path, &line, NULL, NULL)) { 1395 g_debug(" failed to read disk size"); 1396 continue; 1397 } 1398 if (g_strcmp0(line, "0\n") == 0) { 1399 g_debug(" skipping zero-sized disk"); 1400 continue; 1401 } 1402 1403 g_debug(" adding %s", de->d_name); 1404 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name); 1405 dev_name = get_device_for_syspath(disk_dir); 1406 if (dev_name == NULL) { 1407 g_debug("Failed to get device name for syspath: %s", 1408 disk_dir); 1409 continue; 1410 } 1411 disk = g_new0(GuestDiskInfo, 1); 1412 disk->name = dev_name; 1413 disk->partition = false; 1414 disk->alias = get_alias_for_syspath(disk_dir); 1415 disk->has_alias = (disk->alias != NULL); 1416 item = g_new0(GuestDiskInfoList, 1); 1417 item->value = disk; 1418 item->next = ret; 1419 ret = item; 1420 1421 /* Get address for non-virtual devices */ 1422 bool is_virtual = is_disk_virtual(disk_dir, &local_err); 1423 if (local_err != NULL) { 1424 g_debug(" failed to check disk path, ignoring error: %s", 1425 error_get_pretty(local_err)); 1426 error_free(local_err); 1427 local_err = NULL; 1428 /* Don't try to get the address */ 1429 is_virtual = true; 1430 } 1431 if (!is_virtual) { 1432 disk->address = get_disk_address(disk_dir, &local_err); 1433 if (local_err != NULL) { 1434 g_debug(" failed to get device info, ignoring error: %s", 1435 error_get_pretty(local_err)); 1436 error_free(local_err); 1437 local_err = NULL; 1438 } else if (disk->address != NULL) { 1439 disk->has_address = true; 1440 } 1441 } 1442 1443 get_disk_deps(disk_dir, disk); 1444 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); 1445 } 1446 return ret; 1447 } 1448 1449 #else 1450 1451 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1452 { 1453 error_setg(errp, QERR_UNSUPPORTED); 1454 return NULL; 1455 } 1456 1457 #endif 1458 1459 /* Return a list of the disk device(s)' info which @mount lies on */ 1460 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1461 Error **errp) 1462 { 1463 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1464 struct statvfs buf; 1465 unsigned long used, nonroot_total, fr_size; 1466 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1467 mount->devmajor, mount->devminor); 1468 1469 fs->mountpoint = g_strdup(mount->dirname); 1470 fs->type = g_strdup(mount->devtype); 1471 build_guest_fsinfo_for_device(devpath, fs, errp); 1472 1473 if (statvfs(fs->mountpoint, &buf) == 0) { 1474 fr_size = buf.f_frsize; 1475 used = buf.f_blocks - buf.f_bfree; 1476 nonroot_total = used + buf.f_bavail; 1477 fs->used_bytes = used * fr_size; 1478 fs->total_bytes = nonroot_total * fr_size; 1479 1480 fs->has_total_bytes = true; 1481 fs->has_used_bytes = true; 1482 } 1483 1484 g_free(devpath); 1485 1486 return fs; 1487 } 1488 1489 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1490 { 1491 FsMountList mounts; 1492 struct FsMount *mount; 1493 GuestFilesystemInfoList *new, *ret = NULL; 1494 Error *local_err = NULL; 1495 1496 QTAILQ_INIT(&mounts); 1497 build_fs_mount_list(&mounts, &local_err); 1498 if (local_err) { 1499 error_propagate(errp, local_err); 1500 return NULL; 1501 } 1502 1503 QTAILQ_FOREACH(mount, &mounts, next) { 1504 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1505 1506 new = g_malloc0(sizeof(*ret)); 1507 new->value = build_guest_fsinfo(mount, &local_err); 1508 new->next = ret; 1509 ret = new; 1510 if (local_err) { 1511 error_propagate(errp, local_err); 1512 qapi_free_GuestFilesystemInfoList(ret); 1513 ret = NULL; 1514 break; 1515 } 1516 } 1517 1518 free_fs_mount_list(&mounts); 1519 return ret; 1520 } 1521 1522 1523 typedef enum { 1524 FSFREEZE_HOOK_THAW = 0, 1525 FSFREEZE_HOOK_FREEZE, 1526 } FsfreezeHookArg; 1527 1528 static const char *fsfreeze_hook_arg_string[] = { 1529 "thaw", 1530 "freeze", 1531 }; 1532 1533 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1534 { 1535 int status; 1536 pid_t pid; 1537 const char *hook; 1538 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1539 Error *local_err = NULL; 1540 1541 hook = ga_fsfreeze_hook(ga_state); 1542 if (!hook) { 1543 return; 1544 } 1545 if (access(hook, X_OK) != 0) { 1546 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1547 return; 1548 } 1549 1550 slog("executing fsfreeze hook with arg '%s'", arg_str); 1551 pid = fork(); 1552 if (pid == 0) { 1553 setsid(); 1554 reopen_fd_to_null(0); 1555 reopen_fd_to_null(1); 1556 reopen_fd_to_null(2); 1557 1558 execle(hook, hook, arg_str, NULL, environ); 1559 _exit(EXIT_FAILURE); 1560 } else if (pid < 0) { 1561 error_setg_errno(errp, errno, "failed to create child process"); 1562 return; 1563 } 1564 1565 ga_wait_child(pid, &status, &local_err); 1566 if (local_err) { 1567 error_propagate(errp, local_err); 1568 return; 1569 } 1570 1571 if (!WIFEXITED(status)) { 1572 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1573 return; 1574 } 1575 1576 status = WEXITSTATUS(status); 1577 if (status) { 1578 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1579 return; 1580 } 1581 } 1582 1583 /* 1584 * Return status of freeze/thaw 1585 */ 1586 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1587 { 1588 if (ga_is_frozen(ga_state)) { 1589 return GUEST_FSFREEZE_STATUS_FROZEN; 1590 } 1591 1592 return GUEST_FSFREEZE_STATUS_THAWED; 1593 } 1594 1595 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1596 { 1597 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1598 } 1599 1600 /* 1601 * Walk list of mounted file systems in the guest, and freeze the ones which 1602 * are real local file systems. 1603 */ 1604 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1605 strList *mountpoints, 1606 Error **errp) 1607 { 1608 int ret = 0, i = 0; 1609 strList *list; 1610 FsMountList mounts; 1611 struct FsMount *mount; 1612 Error *local_err = NULL; 1613 int fd; 1614 1615 slog("guest-fsfreeze called"); 1616 1617 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1618 if (local_err) { 1619 error_propagate(errp, local_err); 1620 return -1; 1621 } 1622 1623 QTAILQ_INIT(&mounts); 1624 build_fs_mount_list(&mounts, &local_err); 1625 if (local_err) { 1626 error_propagate(errp, local_err); 1627 return -1; 1628 } 1629 1630 /* cannot risk guest agent blocking itself on a write in this state */ 1631 ga_set_frozen(ga_state); 1632 1633 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1634 /* To issue fsfreeze in the reverse order of mounts, check if the 1635 * mount is listed in the list here */ 1636 if (has_mountpoints) { 1637 for (list = mountpoints; list; list = list->next) { 1638 if (strcmp(list->value, mount->dirname) == 0) { 1639 break; 1640 } 1641 } 1642 if (!list) { 1643 continue; 1644 } 1645 } 1646 1647 fd = qemu_open_old(mount->dirname, O_RDONLY); 1648 if (fd == -1) { 1649 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1650 goto error; 1651 } 1652 1653 /* we try to cull filesystems we know won't work in advance, but other 1654 * filesystems may not implement fsfreeze for less obvious reasons. 1655 * these will report EOPNOTSUPP. we simply ignore these when tallying 1656 * the number of frozen filesystems. 1657 * if a filesystem is mounted more than once (aka bind mount) a 1658 * consecutive attempt to freeze an already frozen filesystem will 1659 * return EBUSY. 1660 * 1661 * any other error means a failure to freeze a filesystem we 1662 * expect to be freezable, so return an error in those cases 1663 * and return system to thawed state. 1664 */ 1665 ret = ioctl(fd, FIFREEZE); 1666 if (ret == -1) { 1667 if (errno != EOPNOTSUPP && errno != EBUSY) { 1668 error_setg_errno(errp, errno, "failed to freeze %s", 1669 mount->dirname); 1670 close(fd); 1671 goto error; 1672 } 1673 } else { 1674 i++; 1675 } 1676 close(fd); 1677 } 1678 1679 free_fs_mount_list(&mounts); 1680 /* We may not issue any FIFREEZE here. 1681 * Just unset ga_state here and ready for the next call. 1682 */ 1683 if (i == 0) { 1684 ga_unset_frozen(ga_state); 1685 } 1686 return i; 1687 1688 error: 1689 free_fs_mount_list(&mounts); 1690 qmp_guest_fsfreeze_thaw(NULL); 1691 return 0; 1692 } 1693 1694 /* 1695 * Walk list of frozen file systems in the guest, and thaw them. 1696 */ 1697 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1698 { 1699 int ret; 1700 FsMountList mounts; 1701 FsMount *mount; 1702 int fd, i = 0, logged; 1703 Error *local_err = NULL; 1704 1705 QTAILQ_INIT(&mounts); 1706 build_fs_mount_list(&mounts, &local_err); 1707 if (local_err) { 1708 error_propagate(errp, local_err); 1709 return 0; 1710 } 1711 1712 QTAILQ_FOREACH(mount, &mounts, next) { 1713 logged = false; 1714 fd = qemu_open_old(mount->dirname, O_RDONLY); 1715 if (fd == -1) { 1716 continue; 1717 } 1718 /* we have no way of knowing whether a filesystem was actually unfrozen 1719 * as a result of a successful call to FITHAW, only that if an error 1720 * was returned the filesystem was *not* unfrozen by that particular 1721 * call. 1722 * 1723 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1724 * to unfreeze, continuing issuing FITHAW until an error is returned, 1725 * in which case either the filesystem is in an unfreezable state, or, 1726 * more likely, it was thawed previously (and remains so afterward). 1727 * 1728 * also, since the most recent successful call is the one that did 1729 * the actual unfreeze, we can use this to provide an accurate count 1730 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1731 * may * be useful for determining whether a filesystem was unfrozen 1732 * during the freeze/thaw phase by a process other than qemu-ga. 1733 */ 1734 do { 1735 ret = ioctl(fd, FITHAW); 1736 if (ret == 0 && !logged) { 1737 i++; 1738 logged = true; 1739 } 1740 } while (ret == 0); 1741 close(fd); 1742 } 1743 1744 ga_unset_frozen(ga_state); 1745 free_fs_mount_list(&mounts); 1746 1747 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1748 1749 return i; 1750 } 1751 1752 static void guest_fsfreeze_cleanup(void) 1753 { 1754 Error *err = NULL; 1755 1756 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1757 qmp_guest_fsfreeze_thaw(&err); 1758 if (err) { 1759 slog("failed to clean up frozen filesystems: %s", 1760 error_get_pretty(err)); 1761 error_free(err); 1762 } 1763 } 1764 } 1765 #endif /* CONFIG_FSFREEZE */ 1766 1767 #if defined(CONFIG_FSTRIM) 1768 /* 1769 * Walk list of mounted file systems in the guest, and trim them. 1770 */ 1771 GuestFilesystemTrimResponse * 1772 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1773 { 1774 GuestFilesystemTrimResponse *response; 1775 GuestFilesystemTrimResultList *list; 1776 GuestFilesystemTrimResult *result; 1777 int ret = 0; 1778 FsMountList mounts; 1779 struct FsMount *mount; 1780 int fd; 1781 Error *local_err = NULL; 1782 struct fstrim_range r; 1783 1784 slog("guest-fstrim called"); 1785 1786 QTAILQ_INIT(&mounts); 1787 build_fs_mount_list(&mounts, &local_err); 1788 if (local_err) { 1789 error_propagate(errp, local_err); 1790 return NULL; 1791 } 1792 1793 response = g_malloc0(sizeof(*response)); 1794 1795 QTAILQ_FOREACH(mount, &mounts, next) { 1796 result = g_malloc0(sizeof(*result)); 1797 result->path = g_strdup(mount->dirname); 1798 1799 list = g_malloc0(sizeof(*list)); 1800 list->value = result; 1801 list->next = response->paths; 1802 response->paths = list; 1803 1804 fd = qemu_open_old(mount->dirname, O_RDONLY); 1805 if (fd == -1) { 1806 result->error = g_strdup_printf("failed to open: %s", 1807 strerror(errno)); 1808 result->has_error = true; 1809 continue; 1810 } 1811 1812 /* We try to cull filesystems we know won't work in advance, but other 1813 * filesystems may not implement fstrim for less obvious reasons. 1814 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1815 * will be reported (e.g. CD-ROMs). 1816 * Any other error means an unexpected error. 1817 */ 1818 r.start = 0; 1819 r.len = -1; 1820 r.minlen = has_minimum ? minimum : 0; 1821 ret = ioctl(fd, FITRIM, &r); 1822 if (ret == -1) { 1823 result->has_error = true; 1824 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1825 result->error = g_strdup("trim not supported"); 1826 } else { 1827 result->error = g_strdup_printf("failed to trim: %s", 1828 strerror(errno)); 1829 } 1830 close(fd); 1831 continue; 1832 } 1833 1834 result->has_minimum = true; 1835 result->minimum = r.minlen; 1836 result->has_trimmed = true; 1837 result->trimmed = r.len; 1838 close(fd); 1839 } 1840 1841 free_fs_mount_list(&mounts); 1842 return response; 1843 } 1844 #endif /* CONFIG_FSTRIM */ 1845 1846 1847 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1848 #define SUSPEND_SUPPORTED 0 1849 #define SUSPEND_NOT_SUPPORTED 1 1850 1851 typedef enum { 1852 SUSPEND_MODE_DISK = 0, 1853 SUSPEND_MODE_RAM = 1, 1854 SUSPEND_MODE_HYBRID = 2, 1855 } SuspendMode; 1856 1857 /* 1858 * Executes a command in a child process using g_spawn_sync, 1859 * returning an int >= 0 representing the exit status of the 1860 * process. 1861 * 1862 * If the program wasn't found in path, returns -1. 1863 * 1864 * If a problem happened when creating the child process, 1865 * returns -1 and errp is set. 1866 */ 1867 static int run_process_child(const char *command[], Error **errp) 1868 { 1869 int exit_status, spawn_flag; 1870 GError *g_err = NULL; 1871 bool success; 1872 1873 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1874 G_SPAWN_STDERR_TO_DEV_NULL; 1875 1876 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1877 NULL, NULL, NULL, NULL, 1878 &exit_status, &g_err); 1879 1880 if (success) { 1881 return WEXITSTATUS(exit_status); 1882 } 1883 1884 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1885 error_setg(errp, "failed to create child process, error '%s'", 1886 g_err->message); 1887 } 1888 1889 g_error_free(g_err); 1890 return -1; 1891 } 1892 1893 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1894 { 1895 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1896 "systemd-hybrid-sleep"}; 1897 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1898 int status; 1899 1900 status = run_process_child(cmd, errp); 1901 1902 /* 1903 * systemctl status uses LSB return codes so we can expect 1904 * status > 0 and be ok. To assert if the guest has support 1905 * for the selected suspend mode, status should be < 4. 4 is 1906 * the code for unknown service status, the return value when 1907 * the service does not exist. A common value is status = 3 1908 * (program is not running). 1909 */ 1910 if (status > 0 && status < 4) { 1911 return true; 1912 } 1913 1914 return false; 1915 } 1916 1917 static void systemd_suspend(SuspendMode mode, Error **errp) 1918 { 1919 Error *local_err = NULL; 1920 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1921 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1922 int status; 1923 1924 status = run_process_child(cmd, &local_err); 1925 1926 if (status == 0) { 1927 return; 1928 } 1929 1930 if ((status == -1) && !local_err) { 1931 error_setg(errp, "the helper program 'systemctl %s' was not found", 1932 systemctl_args[mode]); 1933 return; 1934 } 1935 1936 if (local_err) { 1937 error_propagate(errp, local_err); 1938 } else { 1939 error_setg(errp, "the helper program 'systemctl %s' returned an " 1940 "unexpected exit status code (%d)", 1941 systemctl_args[mode], status); 1942 } 1943 } 1944 1945 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1946 { 1947 Error *local_err = NULL; 1948 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1949 "--suspend-hybrid"}; 1950 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1951 int status; 1952 1953 status = run_process_child(cmd, &local_err); 1954 1955 if (status == SUSPEND_SUPPORTED) { 1956 return true; 1957 } 1958 1959 if ((status == -1) && !local_err) { 1960 return false; 1961 } 1962 1963 if (local_err) { 1964 error_propagate(errp, local_err); 1965 } else { 1966 error_setg(errp, 1967 "the helper program '%s' returned an unexpected exit" 1968 " status code (%d)", "pm-is-supported", status); 1969 } 1970 1971 return false; 1972 } 1973 1974 static void pmutils_suspend(SuspendMode mode, Error **errp) 1975 { 1976 Error *local_err = NULL; 1977 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1978 "pm-suspend-hybrid"}; 1979 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1980 int status; 1981 1982 status = run_process_child(cmd, &local_err); 1983 1984 if (status == 0) { 1985 return; 1986 } 1987 1988 if ((status == -1) && !local_err) { 1989 error_setg(errp, "the helper program '%s' was not found", 1990 pmutils_binaries[mode]); 1991 return; 1992 } 1993 1994 if (local_err) { 1995 error_propagate(errp, local_err); 1996 } else { 1997 error_setg(errp, 1998 "the helper program '%s' returned an unexpected exit" 1999 " status code (%d)", pmutils_binaries[mode], status); 2000 } 2001 } 2002 2003 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 2004 { 2005 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2006 const char *sysfile_str = sysfile_strs[mode]; 2007 char buf[32]; /* hopefully big enough */ 2008 int fd; 2009 ssize_t ret; 2010 2011 if (!sysfile_str) { 2012 error_setg(errp, "unknown guest suspend mode"); 2013 return false; 2014 } 2015 2016 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 2017 if (fd < 0) { 2018 return false; 2019 } 2020 2021 ret = read(fd, buf, sizeof(buf) - 1); 2022 close(fd); 2023 if (ret <= 0) { 2024 return false; 2025 } 2026 buf[ret] = '\0'; 2027 2028 if (strstr(buf, sysfile_str)) { 2029 return true; 2030 } 2031 return false; 2032 } 2033 2034 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 2035 { 2036 Error *local_err = NULL; 2037 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2038 const char *sysfile_str = sysfile_strs[mode]; 2039 pid_t pid; 2040 int status; 2041 2042 if (!sysfile_str) { 2043 error_setg(errp, "unknown guest suspend mode"); 2044 return; 2045 } 2046 2047 pid = fork(); 2048 if (!pid) { 2049 /* child */ 2050 int fd; 2051 2052 setsid(); 2053 reopen_fd_to_null(0); 2054 reopen_fd_to_null(1); 2055 reopen_fd_to_null(2); 2056 2057 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 2058 if (fd < 0) { 2059 _exit(EXIT_FAILURE); 2060 } 2061 2062 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 2063 _exit(EXIT_FAILURE); 2064 } 2065 2066 _exit(EXIT_SUCCESS); 2067 } else if (pid < 0) { 2068 error_setg_errno(errp, errno, "failed to create child process"); 2069 return; 2070 } 2071 2072 ga_wait_child(pid, &status, &local_err); 2073 if (local_err) { 2074 error_propagate(errp, local_err); 2075 return; 2076 } 2077 2078 if (WEXITSTATUS(status)) { 2079 error_setg(errp, "child process has failed to suspend"); 2080 } 2081 2082 } 2083 2084 static void guest_suspend(SuspendMode mode, Error **errp) 2085 { 2086 Error *local_err = NULL; 2087 bool mode_supported = false; 2088 2089 if (systemd_supports_mode(mode, &local_err)) { 2090 mode_supported = true; 2091 systemd_suspend(mode, &local_err); 2092 } 2093 2094 if (!local_err) { 2095 return; 2096 } 2097 2098 error_free(local_err); 2099 local_err = NULL; 2100 2101 if (pmutils_supports_mode(mode, &local_err)) { 2102 mode_supported = true; 2103 pmutils_suspend(mode, &local_err); 2104 } 2105 2106 if (!local_err) { 2107 return; 2108 } 2109 2110 error_free(local_err); 2111 local_err = NULL; 2112 2113 if (linux_sys_state_supports_mode(mode, &local_err)) { 2114 mode_supported = true; 2115 linux_sys_state_suspend(mode, &local_err); 2116 } 2117 2118 if (!mode_supported) { 2119 error_free(local_err); 2120 error_setg(errp, 2121 "the requested suspend mode is not supported by the guest"); 2122 } else { 2123 error_propagate(errp, local_err); 2124 } 2125 } 2126 2127 void qmp_guest_suspend_disk(Error **errp) 2128 { 2129 guest_suspend(SUSPEND_MODE_DISK, errp); 2130 } 2131 2132 void qmp_guest_suspend_ram(Error **errp) 2133 { 2134 guest_suspend(SUSPEND_MODE_RAM, errp); 2135 } 2136 2137 void qmp_guest_suspend_hybrid(Error **errp) 2138 { 2139 guest_suspend(SUSPEND_MODE_HYBRID, errp); 2140 } 2141 2142 static GuestNetworkInterfaceList * 2143 guest_find_interface(GuestNetworkInterfaceList *head, 2144 const char *name) 2145 { 2146 for (; head; head = head->next) { 2147 if (strcmp(head->value->name, name) == 0) { 2148 break; 2149 } 2150 } 2151 2152 return head; 2153 } 2154 2155 static int guest_get_network_stats(const char *name, 2156 GuestNetworkInterfaceStat *stats) 2157 { 2158 int name_len; 2159 char const *devinfo = "/proc/net/dev"; 2160 FILE *fp; 2161 char *line = NULL, *colon; 2162 size_t n = 0; 2163 fp = fopen(devinfo, "r"); 2164 if (!fp) { 2165 return -1; 2166 } 2167 name_len = strlen(name); 2168 while (getline(&line, &n, fp) != -1) { 2169 long long dummy; 2170 long long rx_bytes; 2171 long long rx_packets; 2172 long long rx_errs; 2173 long long rx_dropped; 2174 long long tx_bytes; 2175 long long tx_packets; 2176 long long tx_errs; 2177 long long tx_dropped; 2178 char *trim_line; 2179 trim_line = g_strchug(line); 2180 if (trim_line[0] == '\0') { 2181 continue; 2182 } 2183 colon = strchr(trim_line, ':'); 2184 if (!colon) { 2185 continue; 2186 } 2187 if (colon - name_len == trim_line && 2188 strncmp(trim_line, name, name_len) == 0) { 2189 if (sscanf(colon + 1, 2190 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 2191 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 2192 &dummy, &dummy, &dummy, &dummy, 2193 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 2194 &dummy, &dummy, &dummy, &dummy) != 16) { 2195 continue; 2196 } 2197 stats->rx_bytes = rx_bytes; 2198 stats->rx_packets = rx_packets; 2199 stats->rx_errs = rx_errs; 2200 stats->rx_dropped = rx_dropped; 2201 stats->tx_bytes = tx_bytes; 2202 stats->tx_packets = tx_packets; 2203 stats->tx_errs = tx_errs; 2204 stats->tx_dropped = tx_dropped; 2205 fclose(fp); 2206 g_free(line); 2207 return 0; 2208 } 2209 } 2210 fclose(fp); 2211 g_free(line); 2212 g_debug("/proc/net/dev: Interface '%s' not found", name); 2213 return -1; 2214 } 2215 2216 /* 2217 * Build information about guest interfaces 2218 */ 2219 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2220 { 2221 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 2222 struct ifaddrs *ifap, *ifa; 2223 2224 if (getifaddrs(&ifap) < 0) { 2225 error_setg_errno(errp, errno, "getifaddrs failed"); 2226 goto error; 2227 } 2228 2229 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2230 GuestNetworkInterfaceList *info; 2231 GuestIpAddressList **address_list = NULL, *address_item = NULL; 2232 GuestNetworkInterfaceStat *interface_stat = NULL; 2233 char addr4[INET_ADDRSTRLEN]; 2234 char addr6[INET6_ADDRSTRLEN]; 2235 int sock; 2236 struct ifreq ifr; 2237 unsigned char *mac_addr; 2238 void *p; 2239 2240 g_debug("Processing %s interface", ifa->ifa_name); 2241 2242 info = guest_find_interface(head, ifa->ifa_name); 2243 2244 if (!info) { 2245 info = g_malloc0(sizeof(*info)); 2246 info->value = g_malloc0(sizeof(*info->value)); 2247 info->value->name = g_strdup(ifa->ifa_name); 2248 2249 if (!cur_item) { 2250 head = cur_item = info; 2251 } else { 2252 cur_item->next = info; 2253 cur_item = info; 2254 } 2255 } 2256 2257 if (!info->value->has_hardware_address && 2258 ifa->ifa_flags & SIOCGIFHWADDR) { 2259 /* we haven't obtained HW address yet */ 2260 sock = socket(PF_INET, SOCK_STREAM, 0); 2261 if (sock == -1) { 2262 error_setg_errno(errp, errno, "failed to create socket"); 2263 goto error; 2264 } 2265 2266 memset(&ifr, 0, sizeof(ifr)); 2267 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 2268 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 2269 error_setg_errno(errp, errno, 2270 "failed to get MAC address of %s", 2271 ifa->ifa_name); 2272 close(sock); 2273 goto error; 2274 } 2275 2276 close(sock); 2277 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 2278 2279 info->value->hardware_address = 2280 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2281 (int) mac_addr[0], (int) mac_addr[1], 2282 (int) mac_addr[2], (int) mac_addr[3], 2283 (int) mac_addr[4], (int) mac_addr[5]); 2284 2285 info->value->has_hardware_address = true; 2286 } 2287 2288 if (ifa->ifa_addr && 2289 ifa->ifa_addr->sa_family == AF_INET) { 2290 /* interface with IPv4 address */ 2291 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2292 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2293 error_setg_errno(errp, errno, "inet_ntop failed"); 2294 goto error; 2295 } 2296 2297 address_item = g_malloc0(sizeof(*address_item)); 2298 address_item->value = g_malloc0(sizeof(*address_item->value)); 2299 address_item->value->ip_address = g_strdup(addr4); 2300 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2301 2302 if (ifa->ifa_netmask) { 2303 /* Count the number of set bits in netmask. 2304 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2305 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2306 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 2307 } 2308 } else if (ifa->ifa_addr && 2309 ifa->ifa_addr->sa_family == AF_INET6) { 2310 /* interface with IPv6 address */ 2311 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2312 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2313 error_setg_errno(errp, errno, "inet_ntop failed"); 2314 goto error; 2315 } 2316 2317 address_item = g_malloc0(sizeof(*address_item)); 2318 address_item->value = g_malloc0(sizeof(*address_item->value)); 2319 address_item->value->ip_address = g_strdup(addr6); 2320 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2321 2322 if (ifa->ifa_netmask) { 2323 /* Count the number of set bits in netmask. 2324 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2325 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2326 address_item->value->prefix = 2327 ctpop32(((uint32_t *) p)[0]) + 2328 ctpop32(((uint32_t *) p)[1]) + 2329 ctpop32(((uint32_t *) p)[2]) + 2330 ctpop32(((uint32_t *) p)[3]); 2331 } 2332 } 2333 2334 if (!address_item) { 2335 continue; 2336 } 2337 2338 address_list = &info->value->ip_addresses; 2339 2340 while (*address_list && (*address_list)->next) { 2341 address_list = &(*address_list)->next; 2342 } 2343 2344 if (!*address_list) { 2345 *address_list = address_item; 2346 } else { 2347 (*address_list)->next = address_item; 2348 } 2349 2350 info->value->has_ip_addresses = true; 2351 2352 if (!info->value->has_statistics) { 2353 interface_stat = g_malloc0(sizeof(*interface_stat)); 2354 if (guest_get_network_stats(info->value->name, 2355 interface_stat) == -1) { 2356 info->value->has_statistics = false; 2357 g_free(interface_stat); 2358 } else { 2359 info->value->statistics = interface_stat; 2360 info->value->has_statistics = true; 2361 } 2362 } 2363 } 2364 2365 freeifaddrs(ifap); 2366 return head; 2367 2368 error: 2369 freeifaddrs(ifap); 2370 qapi_free_GuestNetworkInterfaceList(head); 2371 return NULL; 2372 } 2373 2374 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 2375 2376 static long sysconf_exact(int name, const char *name_str, Error **errp) 2377 { 2378 long ret; 2379 2380 errno = 0; 2381 ret = sysconf(name); 2382 if (ret == -1) { 2383 if (errno == 0) { 2384 error_setg(errp, "sysconf(%s): value indefinite", name_str); 2385 } else { 2386 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 2387 } 2388 } 2389 return ret; 2390 } 2391 2392 /* Transfer online/offline status between @vcpu and the guest system. 2393 * 2394 * On input either @errp or *@errp must be NULL. 2395 * 2396 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2397 * - R: vcpu->logical_id 2398 * - W: vcpu->online 2399 * - W: vcpu->can_offline 2400 * 2401 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2402 * - R: vcpu->logical_id 2403 * - R: vcpu->online 2404 * 2405 * Written members remain unmodified on error. 2406 */ 2407 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2408 char *dirpath, Error **errp) 2409 { 2410 int fd; 2411 int res; 2412 int dirfd; 2413 static const char fn[] = "online"; 2414 2415 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2416 if (dirfd == -1) { 2417 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2418 return; 2419 } 2420 2421 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2422 if (fd == -1) { 2423 if (errno != ENOENT) { 2424 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2425 } else if (sys2vcpu) { 2426 vcpu->online = true; 2427 vcpu->can_offline = false; 2428 } else if (!vcpu->online) { 2429 error_setg(errp, "logical processor #%" PRId64 " can't be " 2430 "offlined", vcpu->logical_id); 2431 } /* otherwise pretend successful re-onlining */ 2432 } else { 2433 unsigned char status; 2434 2435 res = pread(fd, &status, 1, 0); 2436 if (res == -1) { 2437 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2438 } else if (res == 0) { 2439 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2440 fn); 2441 } else if (sys2vcpu) { 2442 vcpu->online = (status != '0'); 2443 vcpu->can_offline = true; 2444 } else if (vcpu->online != (status != '0')) { 2445 status = '0' + vcpu->online; 2446 if (pwrite(fd, &status, 1, 0) == -1) { 2447 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2448 fn); 2449 } 2450 } /* otherwise pretend successful re-(on|off)-lining */ 2451 2452 res = close(fd); 2453 g_assert(res == 0); 2454 } 2455 2456 res = close(dirfd); 2457 g_assert(res == 0); 2458 } 2459 2460 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2461 { 2462 int64_t current; 2463 GuestLogicalProcessorList *head, **link; 2464 long sc_max; 2465 Error *local_err = NULL; 2466 2467 current = 0; 2468 head = NULL; 2469 link = &head; 2470 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 2471 2472 while (local_err == NULL && current < sc_max) { 2473 GuestLogicalProcessor *vcpu; 2474 GuestLogicalProcessorList *entry; 2475 int64_t id = current++; 2476 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2477 id); 2478 2479 if (g_file_test(path, G_FILE_TEST_EXISTS)) { 2480 vcpu = g_malloc0(sizeof *vcpu); 2481 vcpu->logical_id = id; 2482 vcpu->has_can_offline = true; /* lolspeak ftw */ 2483 transfer_vcpu(vcpu, true, path, &local_err); 2484 entry = g_malloc0(sizeof *entry); 2485 entry->value = vcpu; 2486 *link = entry; 2487 link = &entry->next; 2488 } 2489 g_free(path); 2490 } 2491 2492 if (local_err == NULL) { 2493 /* there's no guest with zero VCPUs */ 2494 g_assert(head != NULL); 2495 return head; 2496 } 2497 2498 qapi_free_GuestLogicalProcessorList(head); 2499 error_propagate(errp, local_err); 2500 return NULL; 2501 } 2502 2503 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2504 { 2505 int64_t processed; 2506 Error *local_err = NULL; 2507 2508 processed = 0; 2509 while (vcpus != NULL) { 2510 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2511 vcpus->value->logical_id); 2512 2513 transfer_vcpu(vcpus->value, false, path, &local_err); 2514 g_free(path); 2515 if (local_err != NULL) { 2516 break; 2517 } 2518 ++processed; 2519 vcpus = vcpus->next; 2520 } 2521 2522 if (local_err != NULL) { 2523 if (processed == 0) { 2524 error_propagate(errp, local_err); 2525 } else { 2526 error_free(local_err); 2527 } 2528 } 2529 2530 return processed; 2531 } 2532 2533 void qmp_guest_set_user_password(const char *username, 2534 const char *password, 2535 bool crypted, 2536 Error **errp) 2537 { 2538 Error *local_err = NULL; 2539 char *passwd_path = NULL; 2540 pid_t pid; 2541 int status; 2542 int datafd[2] = { -1, -1 }; 2543 char *rawpasswddata = NULL; 2544 size_t rawpasswdlen; 2545 char *chpasswddata = NULL; 2546 size_t chpasswdlen; 2547 2548 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 2549 if (!rawpasswddata) { 2550 return; 2551 } 2552 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 2553 rawpasswddata[rawpasswdlen] = '\0'; 2554 2555 if (strchr(rawpasswddata, '\n')) { 2556 error_setg(errp, "forbidden characters in raw password"); 2557 goto out; 2558 } 2559 2560 if (strchr(username, '\n') || 2561 strchr(username, ':')) { 2562 error_setg(errp, "forbidden characters in username"); 2563 goto out; 2564 } 2565 2566 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 2567 chpasswdlen = strlen(chpasswddata); 2568 2569 passwd_path = g_find_program_in_path("chpasswd"); 2570 2571 if (!passwd_path) { 2572 error_setg(errp, "cannot find 'passwd' program in PATH"); 2573 goto out; 2574 } 2575 2576 if (pipe(datafd) < 0) { 2577 error_setg(errp, "cannot create pipe FDs"); 2578 goto out; 2579 } 2580 2581 pid = fork(); 2582 if (pid == 0) { 2583 close(datafd[1]); 2584 /* child */ 2585 setsid(); 2586 dup2(datafd[0], 0); 2587 reopen_fd_to_null(1); 2588 reopen_fd_to_null(2); 2589 2590 if (crypted) { 2591 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2592 } else { 2593 execle(passwd_path, "chpasswd", NULL, environ); 2594 } 2595 _exit(EXIT_FAILURE); 2596 } else if (pid < 0) { 2597 error_setg_errno(errp, errno, "failed to create child process"); 2598 goto out; 2599 } 2600 close(datafd[0]); 2601 datafd[0] = -1; 2602 2603 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2604 error_setg_errno(errp, errno, "cannot write new account password"); 2605 goto out; 2606 } 2607 close(datafd[1]); 2608 datafd[1] = -1; 2609 2610 ga_wait_child(pid, &status, &local_err); 2611 if (local_err) { 2612 error_propagate(errp, local_err); 2613 goto out; 2614 } 2615 2616 if (!WIFEXITED(status)) { 2617 error_setg(errp, "child process has terminated abnormally"); 2618 goto out; 2619 } 2620 2621 if (WEXITSTATUS(status)) { 2622 error_setg(errp, "child process has failed to set user password"); 2623 goto out; 2624 } 2625 2626 out: 2627 g_free(chpasswddata); 2628 g_free(rawpasswddata); 2629 g_free(passwd_path); 2630 if (datafd[0] != -1) { 2631 close(datafd[0]); 2632 } 2633 if (datafd[1] != -1) { 2634 close(datafd[1]); 2635 } 2636 } 2637 2638 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2639 int size, Error **errp) 2640 { 2641 int fd; 2642 int res; 2643 2644 errno = 0; 2645 fd = openat(dirfd, pathname, O_RDONLY); 2646 if (fd == -1) { 2647 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2648 return; 2649 } 2650 2651 res = pread(fd, buf, size, 0); 2652 if (res == -1) { 2653 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2654 } else if (res == 0) { 2655 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2656 } 2657 close(fd); 2658 } 2659 2660 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2661 const char *buf, int size, Error **errp) 2662 { 2663 int fd; 2664 2665 errno = 0; 2666 fd = openat(dirfd, pathname, O_WRONLY); 2667 if (fd == -1) { 2668 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2669 return; 2670 } 2671 2672 if (pwrite(fd, buf, size, 0) == -1) { 2673 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2674 } 2675 2676 close(fd); 2677 } 2678 2679 /* Transfer online/offline status between @mem_blk and the guest system. 2680 * 2681 * On input either @errp or *@errp must be NULL. 2682 * 2683 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2684 * - R: mem_blk->phys_index 2685 * - W: mem_blk->online 2686 * - W: mem_blk->can_offline 2687 * 2688 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2689 * - R: mem_blk->phys_index 2690 * - R: mem_blk->online 2691 *- R: mem_blk->can_offline 2692 * Written members remain unmodified on error. 2693 */ 2694 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2695 GuestMemoryBlockResponse *result, 2696 Error **errp) 2697 { 2698 char *dirpath; 2699 int dirfd; 2700 char *status; 2701 Error *local_err = NULL; 2702 2703 if (!sys2memblk) { 2704 DIR *dp; 2705 2706 if (!result) { 2707 error_setg(errp, "Internal error, 'result' should not be NULL"); 2708 return; 2709 } 2710 errno = 0; 2711 dp = opendir("/sys/devices/system/memory/"); 2712 /* if there is no 'memory' directory in sysfs, 2713 * we think this VM does not support online/offline memory block, 2714 * any other solution? 2715 */ 2716 if (!dp) { 2717 if (errno == ENOENT) { 2718 result->response = 2719 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2720 } 2721 goto out1; 2722 } 2723 closedir(dp); 2724 } 2725 2726 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2727 mem_blk->phys_index); 2728 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2729 if (dirfd == -1) { 2730 if (sys2memblk) { 2731 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2732 } else { 2733 if (errno == ENOENT) { 2734 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2735 } else { 2736 result->response = 2737 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2738 } 2739 } 2740 g_free(dirpath); 2741 goto out1; 2742 } 2743 g_free(dirpath); 2744 2745 status = g_malloc0(10); 2746 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2747 if (local_err) { 2748 /* treat with sysfs file that not exist in old kernel */ 2749 if (errno == ENOENT) { 2750 error_free(local_err); 2751 if (sys2memblk) { 2752 mem_blk->online = true; 2753 mem_blk->can_offline = false; 2754 } else if (!mem_blk->online) { 2755 result->response = 2756 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2757 } 2758 } else { 2759 if (sys2memblk) { 2760 error_propagate(errp, local_err); 2761 } else { 2762 error_free(local_err); 2763 result->response = 2764 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2765 } 2766 } 2767 goto out2; 2768 } 2769 2770 if (sys2memblk) { 2771 char removable = '0'; 2772 2773 mem_blk->online = (strncmp(status, "online", 6) == 0); 2774 2775 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2776 if (local_err) { 2777 /* if no 'removable' file, it doesn't support offline mem blk */ 2778 if (errno == ENOENT) { 2779 error_free(local_err); 2780 mem_blk->can_offline = false; 2781 } else { 2782 error_propagate(errp, local_err); 2783 } 2784 } else { 2785 mem_blk->can_offline = (removable != '0'); 2786 } 2787 } else { 2788 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2789 const char *new_state = mem_blk->online ? "online" : "offline"; 2790 2791 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2792 &local_err); 2793 if (local_err) { 2794 error_free(local_err); 2795 result->response = 2796 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2797 goto out2; 2798 } 2799 2800 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2801 result->has_error_code = false; 2802 } /* otherwise pretend successful re-(on|off)-lining */ 2803 } 2804 g_free(status); 2805 close(dirfd); 2806 return; 2807 2808 out2: 2809 g_free(status); 2810 close(dirfd); 2811 out1: 2812 if (!sys2memblk) { 2813 result->has_error_code = true; 2814 result->error_code = errno; 2815 } 2816 } 2817 2818 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2819 { 2820 GuestMemoryBlockList *head, **link; 2821 Error *local_err = NULL; 2822 struct dirent *de; 2823 DIR *dp; 2824 2825 head = NULL; 2826 link = &head; 2827 2828 dp = opendir("/sys/devices/system/memory/"); 2829 if (!dp) { 2830 /* it's ok if this happens to be a system that doesn't expose 2831 * memory blocks via sysfs, but otherwise we should report 2832 * an error 2833 */ 2834 if (errno != ENOENT) { 2835 error_setg_errno(errp, errno, "Can't open directory" 2836 "\"/sys/devices/system/memory/\""); 2837 } 2838 return NULL; 2839 } 2840 2841 /* Note: the phys_index of memory block may be discontinuous, 2842 * this is because a memblk is the unit of the Sparse Memory design, which 2843 * allows discontinuous memory ranges (ex. NUMA), so here we should 2844 * traverse the memory block directory. 2845 */ 2846 while ((de = readdir(dp)) != NULL) { 2847 GuestMemoryBlock *mem_blk; 2848 GuestMemoryBlockList *entry; 2849 2850 if ((strncmp(de->d_name, "memory", 6) != 0) || 2851 !(de->d_type & DT_DIR)) { 2852 continue; 2853 } 2854 2855 mem_blk = g_malloc0(sizeof *mem_blk); 2856 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2857 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2858 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2859 transfer_memory_block(mem_blk, true, NULL, &local_err); 2860 if (local_err) { 2861 break; 2862 } 2863 2864 entry = g_malloc0(sizeof *entry); 2865 entry->value = mem_blk; 2866 2867 *link = entry; 2868 link = &entry->next; 2869 } 2870 2871 closedir(dp); 2872 if (local_err == NULL) { 2873 /* there's no guest with zero memory blocks */ 2874 if (head == NULL) { 2875 error_setg(errp, "guest reported zero memory blocks!"); 2876 } 2877 return head; 2878 } 2879 2880 qapi_free_GuestMemoryBlockList(head); 2881 error_propagate(errp, local_err); 2882 return NULL; 2883 } 2884 2885 GuestMemoryBlockResponseList * 2886 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2887 { 2888 GuestMemoryBlockResponseList *head, **link; 2889 Error *local_err = NULL; 2890 2891 head = NULL; 2892 link = &head; 2893 2894 while (mem_blks != NULL) { 2895 GuestMemoryBlockResponse *result; 2896 GuestMemoryBlockResponseList *entry; 2897 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2898 2899 result = g_malloc0(sizeof(*result)); 2900 result->phys_index = current_mem_blk->phys_index; 2901 transfer_memory_block(current_mem_blk, false, result, &local_err); 2902 if (local_err) { /* should never happen */ 2903 goto err; 2904 } 2905 entry = g_malloc0(sizeof *entry); 2906 entry->value = result; 2907 2908 *link = entry; 2909 link = &entry->next; 2910 mem_blks = mem_blks->next; 2911 } 2912 2913 return head; 2914 err: 2915 qapi_free_GuestMemoryBlockResponseList(head); 2916 error_propagate(errp, local_err); 2917 return NULL; 2918 } 2919 2920 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2921 { 2922 Error *local_err = NULL; 2923 char *dirpath; 2924 int dirfd; 2925 char *buf; 2926 GuestMemoryBlockInfo *info; 2927 2928 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2929 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2930 if (dirfd == -1) { 2931 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2932 g_free(dirpath); 2933 return NULL; 2934 } 2935 g_free(dirpath); 2936 2937 buf = g_malloc0(20); 2938 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2939 close(dirfd); 2940 if (local_err) { 2941 g_free(buf); 2942 error_propagate(errp, local_err); 2943 return NULL; 2944 } 2945 2946 info = g_new0(GuestMemoryBlockInfo, 1); 2947 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2948 2949 g_free(buf); 2950 2951 return info; 2952 } 2953 2954 #else /* defined(__linux__) */ 2955 2956 void qmp_guest_suspend_disk(Error **errp) 2957 { 2958 error_setg(errp, QERR_UNSUPPORTED); 2959 } 2960 2961 void qmp_guest_suspend_ram(Error **errp) 2962 { 2963 error_setg(errp, QERR_UNSUPPORTED); 2964 } 2965 2966 void qmp_guest_suspend_hybrid(Error **errp) 2967 { 2968 error_setg(errp, QERR_UNSUPPORTED); 2969 } 2970 2971 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2972 { 2973 error_setg(errp, QERR_UNSUPPORTED); 2974 return NULL; 2975 } 2976 2977 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2978 { 2979 error_setg(errp, QERR_UNSUPPORTED); 2980 return NULL; 2981 } 2982 2983 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2984 { 2985 error_setg(errp, QERR_UNSUPPORTED); 2986 return -1; 2987 } 2988 2989 void qmp_guest_set_user_password(const char *username, 2990 const char *password, 2991 bool crypted, 2992 Error **errp) 2993 { 2994 error_setg(errp, QERR_UNSUPPORTED); 2995 } 2996 2997 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2998 { 2999 error_setg(errp, QERR_UNSUPPORTED); 3000 return NULL; 3001 } 3002 3003 GuestMemoryBlockResponseList * 3004 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 3005 { 3006 error_setg(errp, QERR_UNSUPPORTED); 3007 return NULL; 3008 } 3009 3010 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 3011 { 3012 error_setg(errp, QERR_UNSUPPORTED); 3013 return NULL; 3014 } 3015 3016 #endif 3017 3018 #if !defined(CONFIG_FSFREEZE) 3019 3020 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 3021 { 3022 error_setg(errp, QERR_UNSUPPORTED); 3023 return NULL; 3024 } 3025 3026 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 3027 { 3028 error_setg(errp, QERR_UNSUPPORTED); 3029 3030 return 0; 3031 } 3032 3033 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 3034 { 3035 error_setg(errp, QERR_UNSUPPORTED); 3036 3037 return 0; 3038 } 3039 3040 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 3041 strList *mountpoints, 3042 Error **errp) 3043 { 3044 error_setg(errp, QERR_UNSUPPORTED); 3045 3046 return 0; 3047 } 3048 3049 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 3050 { 3051 error_setg(errp, QERR_UNSUPPORTED); 3052 3053 return 0; 3054 } 3055 3056 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 3057 { 3058 error_setg(errp, QERR_UNSUPPORTED); 3059 return NULL; 3060 } 3061 3062 #endif /* CONFIG_FSFREEZE */ 3063 3064 #if !defined(CONFIG_FSTRIM) 3065 GuestFilesystemTrimResponse * 3066 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 3067 { 3068 error_setg(errp, QERR_UNSUPPORTED); 3069 return NULL; 3070 } 3071 #endif 3072 3073 /* add unsupported commands to the blacklist */ 3074 GList *ga_command_blacklist_init(GList *blacklist) 3075 { 3076 #if !defined(__linux__) 3077 { 3078 const char *list[] = { 3079 "guest-suspend-disk", "guest-suspend-ram", 3080 "guest-suspend-hybrid", "guest-network-get-interfaces", 3081 "guest-get-vcpus", "guest-set-vcpus", 3082 "guest-get-memory-blocks", "guest-set-memory-blocks", 3083 "guest-get-memory-block-size", "guest-get-memory-block-info", 3084 NULL}; 3085 char **p = (char **)list; 3086 3087 while (*p) { 3088 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3089 } 3090 } 3091 #endif 3092 3093 #if !defined(CONFIG_FSFREEZE) 3094 { 3095 const char *list[] = { 3096 "guest-get-fsinfo", "guest-fsfreeze-status", 3097 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 3098 "guest-fsfreeze-thaw", "guest-get-fsinfo", 3099 "guest-get-disks", NULL}; 3100 char **p = (char **)list; 3101 3102 while (*p) { 3103 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3104 } 3105 } 3106 #endif 3107 3108 #if !defined(CONFIG_FSTRIM) 3109 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 3110 #endif 3111 3112 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 3113 3114 return blacklist; 3115 } 3116 3117 /* register init/cleanup routines for stateful command groups */ 3118 void ga_command_state_init(GAState *s, GACommandState *cs) 3119 { 3120 #if defined(CONFIG_FSFREEZE) 3121 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 3122 #endif 3123 } 3124 3125 #ifdef HAVE_UTMPX 3126 3127 #define QGA_MICRO_SECOND_TO_SECOND 1000000 3128 3129 static double ga_get_login_time(struct utmpx *user_info) 3130 { 3131 double seconds = (double)user_info->ut_tv.tv_sec; 3132 double useconds = (double)user_info->ut_tv.tv_usec; 3133 useconds /= QGA_MICRO_SECOND_TO_SECOND; 3134 return seconds + useconds; 3135 } 3136 3137 GuestUserList *qmp_guest_get_users(Error **errp) 3138 { 3139 GHashTable *cache = NULL; 3140 GuestUserList *head = NULL, *cur_item = NULL; 3141 struct utmpx *user_info = NULL; 3142 gpointer value = NULL; 3143 GuestUser *user = NULL; 3144 GuestUserList *item = NULL; 3145 double login_time = 0; 3146 3147 cache = g_hash_table_new(g_str_hash, g_str_equal); 3148 setutxent(); 3149 3150 for (;;) { 3151 user_info = getutxent(); 3152 if (user_info == NULL) { 3153 break; 3154 } else if (user_info->ut_type != USER_PROCESS) { 3155 continue; 3156 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 3157 value = g_hash_table_lookup(cache, user_info->ut_user); 3158 user = (GuestUser *)value; 3159 login_time = ga_get_login_time(user_info); 3160 /* We're ensuring the earliest login time to be sent */ 3161 if (login_time < user->login_time) { 3162 user->login_time = login_time; 3163 } 3164 continue; 3165 } 3166 3167 item = g_new0(GuestUserList, 1); 3168 item->value = g_new0(GuestUser, 1); 3169 item->value->user = g_strdup(user_info->ut_user); 3170 item->value->login_time = ga_get_login_time(user_info); 3171 3172 g_hash_table_insert(cache, item->value->user, item->value); 3173 3174 if (!cur_item) { 3175 head = cur_item = item; 3176 } else { 3177 cur_item->next = item; 3178 cur_item = item; 3179 } 3180 } 3181 endutxent(); 3182 g_hash_table_destroy(cache); 3183 return head; 3184 } 3185 3186 #else 3187 3188 GuestUserList *qmp_guest_get_users(Error **errp) 3189 { 3190 error_setg(errp, QERR_UNSUPPORTED); 3191 return NULL; 3192 } 3193 3194 #endif 3195 3196 /* Replace escaped special characters with theire real values. The replacement 3197 * is done in place -- returned value is in the original string. 3198 */ 3199 static void ga_osrelease_replace_special(gchar *value) 3200 { 3201 gchar *p, *p2, quote; 3202 3203 /* Trim the string at first space or semicolon if it is not enclosed in 3204 * single or double quotes. */ 3205 if ((value[0] != '"') || (value[0] == '\'')) { 3206 p = strchr(value, ' '); 3207 if (p != NULL) { 3208 *p = 0; 3209 } 3210 p = strchr(value, ';'); 3211 if (p != NULL) { 3212 *p = 0; 3213 } 3214 return; 3215 } 3216 3217 quote = value[0]; 3218 p2 = value; 3219 p = value + 1; 3220 while (*p != 0) { 3221 if (*p == '\\') { 3222 p++; 3223 switch (*p) { 3224 case '$': 3225 case '\'': 3226 case '"': 3227 case '\\': 3228 case '`': 3229 break; 3230 default: 3231 /* Keep literal backslash followed by whatever is there */ 3232 p--; 3233 break; 3234 } 3235 } else if (*p == quote) { 3236 *p2 = 0; 3237 break; 3238 } 3239 *(p2++) = *(p++); 3240 } 3241 } 3242 3243 static GKeyFile *ga_parse_osrelease(const char *fname) 3244 { 3245 gchar *content = NULL; 3246 gchar *content2 = NULL; 3247 GError *err = NULL; 3248 GKeyFile *keys = g_key_file_new(); 3249 const char *group = "[os-release]\n"; 3250 3251 if (!g_file_get_contents(fname, &content, NULL, &err)) { 3252 slog("failed to read '%s', error: %s", fname, err->message); 3253 goto fail; 3254 } 3255 3256 if (!g_utf8_validate(content, -1, NULL)) { 3257 slog("file is not utf-8 encoded: %s", fname); 3258 goto fail; 3259 } 3260 content2 = g_strdup_printf("%s%s", group, content); 3261 3262 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 3263 &err)) { 3264 slog("failed to parse file '%s', error: %s", fname, err->message); 3265 goto fail; 3266 } 3267 3268 g_free(content); 3269 g_free(content2); 3270 return keys; 3271 3272 fail: 3273 g_error_free(err); 3274 g_free(content); 3275 g_free(content2); 3276 g_key_file_free(keys); 3277 return NULL; 3278 } 3279 3280 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 3281 { 3282 GuestOSInfo *info = NULL; 3283 struct utsname kinfo; 3284 GKeyFile *osrelease = NULL; 3285 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 3286 3287 info = g_new0(GuestOSInfo, 1); 3288 3289 if (uname(&kinfo) != 0) { 3290 error_setg_errno(errp, errno, "uname failed"); 3291 } else { 3292 info->has_kernel_version = true; 3293 info->kernel_version = g_strdup(kinfo.version); 3294 info->has_kernel_release = true; 3295 info->kernel_release = g_strdup(kinfo.release); 3296 info->has_machine = true; 3297 info->machine = g_strdup(kinfo.machine); 3298 } 3299 3300 if (qga_os_release != NULL) { 3301 osrelease = ga_parse_osrelease(qga_os_release); 3302 } else { 3303 osrelease = ga_parse_osrelease("/etc/os-release"); 3304 if (osrelease == NULL) { 3305 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3306 } 3307 } 3308 3309 if (osrelease != NULL) { 3310 char *value; 3311 3312 #define GET_FIELD(field, osfield) do { \ 3313 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3314 if (value != NULL) { \ 3315 ga_osrelease_replace_special(value); \ 3316 info->has_ ## field = true; \ 3317 info->field = value; \ 3318 } \ 3319 } while (0) 3320 GET_FIELD(id, "ID"); 3321 GET_FIELD(name, "NAME"); 3322 GET_FIELD(pretty_name, "PRETTY_NAME"); 3323 GET_FIELD(version, "VERSION"); 3324 GET_FIELD(version_id, "VERSION_ID"); 3325 GET_FIELD(variant, "VARIANT"); 3326 GET_FIELD(variant_id, "VARIANT_ID"); 3327 #undef GET_FIELD 3328 3329 g_key_file_free(osrelease); 3330 } 3331 3332 return info; 3333 } 3334 3335 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3336 { 3337 error_setg(errp, QERR_UNSUPPORTED); 3338 3339 return NULL; 3340 } 3341