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 disk->has_dependencies = true; 1289 while ((dep = g_dir_read_name(dp_deps)) != NULL) { 1290 g_autofree char *dep_dir = NULL; 1291 strList *dep_item = NULL; 1292 char *dev_name; 1293 1294 /* Add dependent disks */ 1295 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep); 1296 dev_name = get_device_for_syspath(dep_dir); 1297 if (dev_name != NULL) { 1298 g_debug(" adding dependent device: %s", dev_name); 1299 dep_item = g_new0(strList, 1); 1300 dep_item->value = dev_name; 1301 dep_item->next = disk->dependencies; 1302 disk->dependencies = dep_item; 1303 } 1304 } 1305 g_dir_close(dp_deps); 1306 } 1307 1308 /* 1309 * Detect partitions subdirectory, name is "<disk_name><number>" or 1310 * "<disk_name>p<number>" 1311 * 1312 * @disk_name -- last component of /sys path (e.g. sda) 1313 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda) 1314 * @disk_dev -- device node of the disk (e.g. /dev/sda) 1315 */ 1316 static GuestDiskInfoList *get_disk_partitions( 1317 GuestDiskInfoList *list, 1318 const char *disk_name, const char *disk_dir, 1319 const char *disk_dev) 1320 { 1321 GuestDiskInfoList *item, *ret = list; 1322 struct dirent *de_disk; 1323 DIR *dp_disk = NULL; 1324 size_t len = strlen(disk_name); 1325 1326 dp_disk = opendir(disk_dir); 1327 while ((de_disk = readdir(dp_disk)) != NULL) { 1328 g_autofree char *partition_dir = NULL; 1329 char *dev_name; 1330 GuestDiskInfo *partition; 1331 1332 if (!(de_disk->d_type & DT_DIR)) { 1333 continue; 1334 } 1335 1336 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 && 1337 ((*(de_disk->d_name + len) == 'p' && 1338 isdigit(*(de_disk->d_name + len + 1))) || 1339 isdigit(*(de_disk->d_name + len))))) { 1340 continue; 1341 } 1342 1343 partition_dir = g_strdup_printf("%s/%s", 1344 disk_dir, de_disk->d_name); 1345 dev_name = get_device_for_syspath(partition_dir); 1346 if (dev_name == NULL) { 1347 g_debug("Failed to get device name for syspath: %s", 1348 disk_dir); 1349 continue; 1350 } 1351 partition = g_new0(GuestDiskInfo, 1); 1352 partition->name = dev_name; 1353 partition->partition = true; 1354 /* Add parent disk as dependent for easier tracking of hierarchy */ 1355 partition->dependencies = g_new0(strList, 1); 1356 partition->dependencies->value = g_strdup(disk_dev); 1357 partition->has_dependencies = true; 1358 1359 item = g_new0(GuestDiskInfoList, 1); 1360 item->value = partition; 1361 item->next = ret; 1362 ret = item; 1363 1364 } 1365 closedir(dp_disk); 1366 1367 return ret; 1368 } 1369 1370 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1371 { 1372 GuestDiskInfoList *item, *ret = NULL; 1373 GuestDiskInfo *disk; 1374 DIR *dp = NULL; 1375 struct dirent *de = NULL; 1376 1377 g_debug("listing /sys/block directory"); 1378 dp = opendir("/sys/block"); 1379 if (dp == NULL) { 1380 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\""); 1381 return NULL; 1382 } 1383 while ((de = readdir(dp)) != NULL) { 1384 g_autofree char *disk_dir = NULL, *line = NULL, 1385 *size_path = NULL; 1386 char *dev_name; 1387 Error *local_err = NULL; 1388 if (de->d_type != DT_LNK) { 1389 g_debug(" skipping entry: %s", de->d_name); 1390 continue; 1391 } 1392 1393 /* Check size and skip zero-sized disks */ 1394 g_debug(" checking disk size"); 1395 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name); 1396 if (!g_file_get_contents(size_path, &line, NULL, NULL)) { 1397 g_debug(" failed to read disk size"); 1398 continue; 1399 } 1400 if (g_strcmp0(line, "0\n") == 0) { 1401 g_debug(" skipping zero-sized disk"); 1402 continue; 1403 } 1404 1405 g_debug(" adding %s", de->d_name); 1406 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name); 1407 dev_name = get_device_for_syspath(disk_dir); 1408 if (dev_name == NULL) { 1409 g_debug("Failed to get device name for syspath: %s", 1410 disk_dir); 1411 continue; 1412 } 1413 disk = g_new0(GuestDiskInfo, 1); 1414 disk->name = dev_name; 1415 disk->partition = false; 1416 disk->alias = get_alias_for_syspath(disk_dir); 1417 disk->has_alias = (disk->alias != NULL); 1418 item = g_new0(GuestDiskInfoList, 1); 1419 item->value = disk; 1420 item->next = ret; 1421 ret = item; 1422 1423 /* Get address for non-virtual devices */ 1424 bool is_virtual = is_disk_virtual(disk_dir, &local_err); 1425 if (local_err != NULL) { 1426 g_debug(" failed to check disk path, ignoring error: %s", 1427 error_get_pretty(local_err)); 1428 error_free(local_err); 1429 local_err = NULL; 1430 /* Don't try to get the address */ 1431 is_virtual = true; 1432 } 1433 if (!is_virtual) { 1434 disk->address = get_disk_address(disk_dir, &local_err); 1435 if (local_err != NULL) { 1436 g_debug(" failed to get device info, ignoring error: %s", 1437 error_get_pretty(local_err)); 1438 error_free(local_err); 1439 local_err = NULL; 1440 } else if (disk->address != NULL) { 1441 disk->has_address = true; 1442 } 1443 } 1444 1445 get_disk_deps(disk_dir, disk); 1446 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); 1447 } 1448 1449 closedir(dp); 1450 1451 return ret; 1452 } 1453 1454 #else 1455 1456 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1457 { 1458 error_setg(errp, QERR_UNSUPPORTED); 1459 return NULL; 1460 } 1461 1462 #endif 1463 1464 /* Return a list of the disk device(s)' info which @mount lies on */ 1465 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1466 Error **errp) 1467 { 1468 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1469 struct statvfs buf; 1470 unsigned long used, nonroot_total, fr_size; 1471 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1472 mount->devmajor, mount->devminor); 1473 1474 fs->mountpoint = g_strdup(mount->dirname); 1475 fs->type = g_strdup(mount->devtype); 1476 build_guest_fsinfo_for_device(devpath, fs, errp); 1477 1478 if (statvfs(fs->mountpoint, &buf) == 0) { 1479 fr_size = buf.f_frsize; 1480 used = buf.f_blocks - buf.f_bfree; 1481 nonroot_total = used + buf.f_bavail; 1482 fs->used_bytes = used * fr_size; 1483 fs->total_bytes = nonroot_total * fr_size; 1484 1485 fs->has_total_bytes = true; 1486 fs->has_used_bytes = true; 1487 } 1488 1489 g_free(devpath); 1490 1491 return fs; 1492 } 1493 1494 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1495 { 1496 FsMountList mounts; 1497 struct FsMount *mount; 1498 GuestFilesystemInfoList *new, *ret = NULL; 1499 Error *local_err = NULL; 1500 1501 QTAILQ_INIT(&mounts); 1502 build_fs_mount_list(&mounts, &local_err); 1503 if (local_err) { 1504 error_propagate(errp, local_err); 1505 return NULL; 1506 } 1507 1508 QTAILQ_FOREACH(mount, &mounts, next) { 1509 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1510 1511 new = g_malloc0(sizeof(*ret)); 1512 new->value = build_guest_fsinfo(mount, &local_err); 1513 new->next = ret; 1514 ret = new; 1515 if (local_err) { 1516 error_propagate(errp, local_err); 1517 qapi_free_GuestFilesystemInfoList(ret); 1518 ret = NULL; 1519 break; 1520 } 1521 } 1522 1523 free_fs_mount_list(&mounts); 1524 return ret; 1525 } 1526 1527 1528 typedef enum { 1529 FSFREEZE_HOOK_THAW = 0, 1530 FSFREEZE_HOOK_FREEZE, 1531 } FsfreezeHookArg; 1532 1533 static const char *fsfreeze_hook_arg_string[] = { 1534 "thaw", 1535 "freeze", 1536 }; 1537 1538 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1539 { 1540 int status; 1541 pid_t pid; 1542 const char *hook; 1543 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1544 Error *local_err = NULL; 1545 1546 hook = ga_fsfreeze_hook(ga_state); 1547 if (!hook) { 1548 return; 1549 } 1550 if (access(hook, X_OK) != 0) { 1551 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1552 return; 1553 } 1554 1555 slog("executing fsfreeze hook with arg '%s'", arg_str); 1556 pid = fork(); 1557 if (pid == 0) { 1558 setsid(); 1559 reopen_fd_to_null(0); 1560 reopen_fd_to_null(1); 1561 reopen_fd_to_null(2); 1562 1563 execle(hook, hook, arg_str, NULL, environ); 1564 _exit(EXIT_FAILURE); 1565 } else if (pid < 0) { 1566 error_setg_errno(errp, errno, "failed to create child process"); 1567 return; 1568 } 1569 1570 ga_wait_child(pid, &status, &local_err); 1571 if (local_err) { 1572 error_propagate(errp, local_err); 1573 return; 1574 } 1575 1576 if (!WIFEXITED(status)) { 1577 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1578 return; 1579 } 1580 1581 status = WEXITSTATUS(status); 1582 if (status) { 1583 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1584 return; 1585 } 1586 } 1587 1588 /* 1589 * Return status of freeze/thaw 1590 */ 1591 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1592 { 1593 if (ga_is_frozen(ga_state)) { 1594 return GUEST_FSFREEZE_STATUS_FROZEN; 1595 } 1596 1597 return GUEST_FSFREEZE_STATUS_THAWED; 1598 } 1599 1600 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1601 { 1602 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1603 } 1604 1605 /* 1606 * Walk list of mounted file systems in the guest, and freeze the ones which 1607 * are real local file systems. 1608 */ 1609 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1610 strList *mountpoints, 1611 Error **errp) 1612 { 1613 int ret = 0, i = 0; 1614 strList *list; 1615 FsMountList mounts; 1616 struct FsMount *mount; 1617 Error *local_err = NULL; 1618 int fd; 1619 1620 slog("guest-fsfreeze called"); 1621 1622 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1623 if (local_err) { 1624 error_propagate(errp, local_err); 1625 return -1; 1626 } 1627 1628 QTAILQ_INIT(&mounts); 1629 build_fs_mount_list(&mounts, &local_err); 1630 if (local_err) { 1631 error_propagate(errp, local_err); 1632 return -1; 1633 } 1634 1635 /* cannot risk guest agent blocking itself on a write in this state */ 1636 ga_set_frozen(ga_state); 1637 1638 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1639 /* To issue fsfreeze in the reverse order of mounts, check if the 1640 * mount is listed in the list here */ 1641 if (has_mountpoints) { 1642 for (list = mountpoints; list; list = list->next) { 1643 if (strcmp(list->value, mount->dirname) == 0) { 1644 break; 1645 } 1646 } 1647 if (!list) { 1648 continue; 1649 } 1650 } 1651 1652 fd = qemu_open_old(mount->dirname, O_RDONLY); 1653 if (fd == -1) { 1654 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1655 goto error; 1656 } 1657 1658 /* we try to cull filesystems we know won't work in advance, but other 1659 * filesystems may not implement fsfreeze for less obvious reasons. 1660 * these will report EOPNOTSUPP. we simply ignore these when tallying 1661 * the number of frozen filesystems. 1662 * if a filesystem is mounted more than once (aka bind mount) a 1663 * consecutive attempt to freeze an already frozen filesystem will 1664 * return EBUSY. 1665 * 1666 * any other error means a failure to freeze a filesystem we 1667 * expect to be freezable, so return an error in those cases 1668 * and return system to thawed state. 1669 */ 1670 ret = ioctl(fd, FIFREEZE); 1671 if (ret == -1) { 1672 if (errno != EOPNOTSUPP && errno != EBUSY) { 1673 error_setg_errno(errp, errno, "failed to freeze %s", 1674 mount->dirname); 1675 close(fd); 1676 goto error; 1677 } 1678 } else { 1679 i++; 1680 } 1681 close(fd); 1682 } 1683 1684 free_fs_mount_list(&mounts); 1685 /* We may not issue any FIFREEZE here. 1686 * Just unset ga_state here and ready for the next call. 1687 */ 1688 if (i == 0) { 1689 ga_unset_frozen(ga_state); 1690 } 1691 return i; 1692 1693 error: 1694 free_fs_mount_list(&mounts); 1695 qmp_guest_fsfreeze_thaw(NULL); 1696 return 0; 1697 } 1698 1699 /* 1700 * Walk list of frozen file systems in the guest, and thaw them. 1701 */ 1702 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1703 { 1704 int ret; 1705 FsMountList mounts; 1706 FsMount *mount; 1707 int fd, i = 0, logged; 1708 Error *local_err = NULL; 1709 1710 QTAILQ_INIT(&mounts); 1711 build_fs_mount_list(&mounts, &local_err); 1712 if (local_err) { 1713 error_propagate(errp, local_err); 1714 return 0; 1715 } 1716 1717 QTAILQ_FOREACH(mount, &mounts, next) { 1718 logged = false; 1719 fd = qemu_open_old(mount->dirname, O_RDONLY); 1720 if (fd == -1) { 1721 continue; 1722 } 1723 /* we have no way of knowing whether a filesystem was actually unfrozen 1724 * as a result of a successful call to FITHAW, only that if an error 1725 * was returned the filesystem was *not* unfrozen by that particular 1726 * call. 1727 * 1728 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1729 * to unfreeze, continuing issuing FITHAW until an error is returned, 1730 * in which case either the filesystem is in an unfreezable state, or, 1731 * more likely, it was thawed previously (and remains so afterward). 1732 * 1733 * also, since the most recent successful call is the one that did 1734 * the actual unfreeze, we can use this to provide an accurate count 1735 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1736 * may * be useful for determining whether a filesystem was unfrozen 1737 * during the freeze/thaw phase by a process other than qemu-ga. 1738 */ 1739 do { 1740 ret = ioctl(fd, FITHAW); 1741 if (ret == 0 && !logged) { 1742 i++; 1743 logged = true; 1744 } 1745 } while (ret == 0); 1746 close(fd); 1747 } 1748 1749 ga_unset_frozen(ga_state); 1750 free_fs_mount_list(&mounts); 1751 1752 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1753 1754 return i; 1755 } 1756 1757 static void guest_fsfreeze_cleanup(void) 1758 { 1759 Error *err = NULL; 1760 1761 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1762 qmp_guest_fsfreeze_thaw(&err); 1763 if (err) { 1764 slog("failed to clean up frozen filesystems: %s", 1765 error_get_pretty(err)); 1766 error_free(err); 1767 } 1768 } 1769 } 1770 #endif /* CONFIG_FSFREEZE */ 1771 1772 #if defined(CONFIG_FSTRIM) 1773 /* 1774 * Walk list of mounted file systems in the guest, and trim them. 1775 */ 1776 GuestFilesystemTrimResponse * 1777 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1778 { 1779 GuestFilesystemTrimResponse *response; 1780 GuestFilesystemTrimResultList *list; 1781 GuestFilesystemTrimResult *result; 1782 int ret = 0; 1783 FsMountList mounts; 1784 struct FsMount *mount; 1785 int fd; 1786 Error *local_err = NULL; 1787 struct fstrim_range r; 1788 1789 slog("guest-fstrim called"); 1790 1791 QTAILQ_INIT(&mounts); 1792 build_fs_mount_list(&mounts, &local_err); 1793 if (local_err) { 1794 error_propagate(errp, local_err); 1795 return NULL; 1796 } 1797 1798 response = g_malloc0(sizeof(*response)); 1799 1800 QTAILQ_FOREACH(mount, &mounts, next) { 1801 result = g_malloc0(sizeof(*result)); 1802 result->path = g_strdup(mount->dirname); 1803 1804 list = g_malloc0(sizeof(*list)); 1805 list->value = result; 1806 list->next = response->paths; 1807 response->paths = list; 1808 1809 fd = qemu_open_old(mount->dirname, O_RDONLY); 1810 if (fd == -1) { 1811 result->error = g_strdup_printf("failed to open: %s", 1812 strerror(errno)); 1813 result->has_error = true; 1814 continue; 1815 } 1816 1817 /* We try to cull filesystems we know won't work in advance, but other 1818 * filesystems may not implement fstrim for less obvious reasons. 1819 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1820 * will be reported (e.g. CD-ROMs). 1821 * Any other error means an unexpected error. 1822 */ 1823 r.start = 0; 1824 r.len = -1; 1825 r.minlen = has_minimum ? minimum : 0; 1826 ret = ioctl(fd, FITRIM, &r); 1827 if (ret == -1) { 1828 result->has_error = true; 1829 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1830 result->error = g_strdup("trim not supported"); 1831 } else { 1832 result->error = g_strdup_printf("failed to trim: %s", 1833 strerror(errno)); 1834 } 1835 close(fd); 1836 continue; 1837 } 1838 1839 result->has_minimum = true; 1840 result->minimum = r.minlen; 1841 result->has_trimmed = true; 1842 result->trimmed = r.len; 1843 close(fd); 1844 } 1845 1846 free_fs_mount_list(&mounts); 1847 return response; 1848 } 1849 #endif /* CONFIG_FSTRIM */ 1850 1851 1852 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1853 #define SUSPEND_SUPPORTED 0 1854 #define SUSPEND_NOT_SUPPORTED 1 1855 1856 typedef enum { 1857 SUSPEND_MODE_DISK = 0, 1858 SUSPEND_MODE_RAM = 1, 1859 SUSPEND_MODE_HYBRID = 2, 1860 } SuspendMode; 1861 1862 /* 1863 * Executes a command in a child process using g_spawn_sync, 1864 * returning an int >= 0 representing the exit status of the 1865 * process. 1866 * 1867 * If the program wasn't found in path, returns -1. 1868 * 1869 * If a problem happened when creating the child process, 1870 * returns -1 and errp is set. 1871 */ 1872 static int run_process_child(const char *command[], Error **errp) 1873 { 1874 int exit_status, spawn_flag; 1875 GError *g_err = NULL; 1876 bool success; 1877 1878 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1879 G_SPAWN_STDERR_TO_DEV_NULL; 1880 1881 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1882 NULL, NULL, NULL, NULL, 1883 &exit_status, &g_err); 1884 1885 if (success) { 1886 return WEXITSTATUS(exit_status); 1887 } 1888 1889 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1890 error_setg(errp, "failed to create child process, error '%s'", 1891 g_err->message); 1892 } 1893 1894 g_error_free(g_err); 1895 return -1; 1896 } 1897 1898 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1899 { 1900 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1901 "systemd-hybrid-sleep"}; 1902 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1903 int status; 1904 1905 status = run_process_child(cmd, errp); 1906 1907 /* 1908 * systemctl status uses LSB return codes so we can expect 1909 * status > 0 and be ok. To assert if the guest has support 1910 * for the selected suspend mode, status should be < 4. 4 is 1911 * the code for unknown service status, the return value when 1912 * the service does not exist. A common value is status = 3 1913 * (program is not running). 1914 */ 1915 if (status > 0 && status < 4) { 1916 return true; 1917 } 1918 1919 return false; 1920 } 1921 1922 static void systemd_suspend(SuspendMode mode, Error **errp) 1923 { 1924 Error *local_err = NULL; 1925 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1926 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1927 int status; 1928 1929 status = run_process_child(cmd, &local_err); 1930 1931 if (status == 0) { 1932 return; 1933 } 1934 1935 if ((status == -1) && !local_err) { 1936 error_setg(errp, "the helper program 'systemctl %s' was not found", 1937 systemctl_args[mode]); 1938 return; 1939 } 1940 1941 if (local_err) { 1942 error_propagate(errp, local_err); 1943 } else { 1944 error_setg(errp, "the helper program 'systemctl %s' returned an " 1945 "unexpected exit status code (%d)", 1946 systemctl_args[mode], status); 1947 } 1948 } 1949 1950 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1951 { 1952 Error *local_err = NULL; 1953 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1954 "--suspend-hybrid"}; 1955 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1956 int status; 1957 1958 status = run_process_child(cmd, &local_err); 1959 1960 if (status == SUSPEND_SUPPORTED) { 1961 return true; 1962 } 1963 1964 if ((status == -1) && !local_err) { 1965 return false; 1966 } 1967 1968 if (local_err) { 1969 error_propagate(errp, local_err); 1970 } else { 1971 error_setg(errp, 1972 "the helper program '%s' returned an unexpected exit" 1973 " status code (%d)", "pm-is-supported", status); 1974 } 1975 1976 return false; 1977 } 1978 1979 static void pmutils_suspend(SuspendMode mode, Error **errp) 1980 { 1981 Error *local_err = NULL; 1982 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1983 "pm-suspend-hybrid"}; 1984 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1985 int status; 1986 1987 status = run_process_child(cmd, &local_err); 1988 1989 if (status == 0) { 1990 return; 1991 } 1992 1993 if ((status == -1) && !local_err) { 1994 error_setg(errp, "the helper program '%s' was not found", 1995 pmutils_binaries[mode]); 1996 return; 1997 } 1998 1999 if (local_err) { 2000 error_propagate(errp, local_err); 2001 } else { 2002 error_setg(errp, 2003 "the helper program '%s' returned an unexpected exit" 2004 " status code (%d)", pmutils_binaries[mode], status); 2005 } 2006 } 2007 2008 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 2009 { 2010 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2011 const char *sysfile_str = sysfile_strs[mode]; 2012 char buf[32]; /* hopefully big enough */ 2013 int fd; 2014 ssize_t ret; 2015 2016 if (!sysfile_str) { 2017 error_setg(errp, "unknown guest suspend mode"); 2018 return false; 2019 } 2020 2021 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 2022 if (fd < 0) { 2023 return false; 2024 } 2025 2026 ret = read(fd, buf, sizeof(buf) - 1); 2027 close(fd); 2028 if (ret <= 0) { 2029 return false; 2030 } 2031 buf[ret] = '\0'; 2032 2033 if (strstr(buf, sysfile_str)) { 2034 return true; 2035 } 2036 return false; 2037 } 2038 2039 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 2040 { 2041 Error *local_err = NULL; 2042 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2043 const char *sysfile_str = sysfile_strs[mode]; 2044 pid_t pid; 2045 int status; 2046 2047 if (!sysfile_str) { 2048 error_setg(errp, "unknown guest suspend mode"); 2049 return; 2050 } 2051 2052 pid = fork(); 2053 if (!pid) { 2054 /* child */ 2055 int fd; 2056 2057 setsid(); 2058 reopen_fd_to_null(0); 2059 reopen_fd_to_null(1); 2060 reopen_fd_to_null(2); 2061 2062 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 2063 if (fd < 0) { 2064 _exit(EXIT_FAILURE); 2065 } 2066 2067 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 2068 _exit(EXIT_FAILURE); 2069 } 2070 2071 _exit(EXIT_SUCCESS); 2072 } else if (pid < 0) { 2073 error_setg_errno(errp, errno, "failed to create child process"); 2074 return; 2075 } 2076 2077 ga_wait_child(pid, &status, &local_err); 2078 if (local_err) { 2079 error_propagate(errp, local_err); 2080 return; 2081 } 2082 2083 if (WEXITSTATUS(status)) { 2084 error_setg(errp, "child process has failed to suspend"); 2085 } 2086 2087 } 2088 2089 static void guest_suspend(SuspendMode mode, Error **errp) 2090 { 2091 Error *local_err = NULL; 2092 bool mode_supported = false; 2093 2094 if (systemd_supports_mode(mode, &local_err)) { 2095 mode_supported = true; 2096 systemd_suspend(mode, &local_err); 2097 } 2098 2099 if (!local_err) { 2100 return; 2101 } 2102 2103 error_free(local_err); 2104 local_err = NULL; 2105 2106 if (pmutils_supports_mode(mode, &local_err)) { 2107 mode_supported = true; 2108 pmutils_suspend(mode, &local_err); 2109 } 2110 2111 if (!local_err) { 2112 return; 2113 } 2114 2115 error_free(local_err); 2116 local_err = NULL; 2117 2118 if (linux_sys_state_supports_mode(mode, &local_err)) { 2119 mode_supported = true; 2120 linux_sys_state_suspend(mode, &local_err); 2121 } 2122 2123 if (!mode_supported) { 2124 error_free(local_err); 2125 error_setg(errp, 2126 "the requested suspend mode is not supported by the guest"); 2127 } else { 2128 error_propagate(errp, local_err); 2129 } 2130 } 2131 2132 void qmp_guest_suspend_disk(Error **errp) 2133 { 2134 guest_suspend(SUSPEND_MODE_DISK, errp); 2135 } 2136 2137 void qmp_guest_suspend_ram(Error **errp) 2138 { 2139 guest_suspend(SUSPEND_MODE_RAM, errp); 2140 } 2141 2142 void qmp_guest_suspend_hybrid(Error **errp) 2143 { 2144 guest_suspend(SUSPEND_MODE_HYBRID, errp); 2145 } 2146 2147 static GuestNetworkInterfaceList * 2148 guest_find_interface(GuestNetworkInterfaceList *head, 2149 const char *name) 2150 { 2151 for (; head; head = head->next) { 2152 if (strcmp(head->value->name, name) == 0) { 2153 break; 2154 } 2155 } 2156 2157 return head; 2158 } 2159 2160 static int guest_get_network_stats(const char *name, 2161 GuestNetworkInterfaceStat *stats) 2162 { 2163 int name_len; 2164 char const *devinfo = "/proc/net/dev"; 2165 FILE *fp; 2166 char *line = NULL, *colon; 2167 size_t n = 0; 2168 fp = fopen(devinfo, "r"); 2169 if (!fp) { 2170 return -1; 2171 } 2172 name_len = strlen(name); 2173 while (getline(&line, &n, fp) != -1) { 2174 long long dummy; 2175 long long rx_bytes; 2176 long long rx_packets; 2177 long long rx_errs; 2178 long long rx_dropped; 2179 long long tx_bytes; 2180 long long tx_packets; 2181 long long tx_errs; 2182 long long tx_dropped; 2183 char *trim_line; 2184 trim_line = g_strchug(line); 2185 if (trim_line[0] == '\0') { 2186 continue; 2187 } 2188 colon = strchr(trim_line, ':'); 2189 if (!colon) { 2190 continue; 2191 } 2192 if (colon - name_len == trim_line && 2193 strncmp(trim_line, name, name_len) == 0) { 2194 if (sscanf(colon + 1, 2195 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 2196 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 2197 &dummy, &dummy, &dummy, &dummy, 2198 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 2199 &dummy, &dummy, &dummy, &dummy) != 16) { 2200 continue; 2201 } 2202 stats->rx_bytes = rx_bytes; 2203 stats->rx_packets = rx_packets; 2204 stats->rx_errs = rx_errs; 2205 stats->rx_dropped = rx_dropped; 2206 stats->tx_bytes = tx_bytes; 2207 stats->tx_packets = tx_packets; 2208 stats->tx_errs = tx_errs; 2209 stats->tx_dropped = tx_dropped; 2210 fclose(fp); 2211 g_free(line); 2212 return 0; 2213 } 2214 } 2215 fclose(fp); 2216 g_free(line); 2217 g_debug("/proc/net/dev: Interface '%s' not found", name); 2218 return -1; 2219 } 2220 2221 /* 2222 * Build information about guest interfaces 2223 */ 2224 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2225 { 2226 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 2227 struct ifaddrs *ifap, *ifa; 2228 2229 if (getifaddrs(&ifap) < 0) { 2230 error_setg_errno(errp, errno, "getifaddrs failed"); 2231 goto error; 2232 } 2233 2234 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2235 GuestNetworkInterfaceList *info; 2236 GuestIpAddressList **address_list = NULL, *address_item = NULL; 2237 GuestNetworkInterfaceStat *interface_stat = NULL; 2238 char addr4[INET_ADDRSTRLEN]; 2239 char addr6[INET6_ADDRSTRLEN]; 2240 int sock; 2241 struct ifreq ifr; 2242 unsigned char *mac_addr; 2243 void *p; 2244 2245 g_debug("Processing %s interface", ifa->ifa_name); 2246 2247 info = guest_find_interface(head, ifa->ifa_name); 2248 2249 if (!info) { 2250 info = g_malloc0(sizeof(*info)); 2251 info->value = g_malloc0(sizeof(*info->value)); 2252 info->value->name = g_strdup(ifa->ifa_name); 2253 2254 if (!cur_item) { 2255 head = cur_item = info; 2256 } else { 2257 cur_item->next = info; 2258 cur_item = info; 2259 } 2260 } 2261 2262 if (!info->value->has_hardware_address && 2263 ifa->ifa_flags & SIOCGIFHWADDR) { 2264 /* we haven't obtained HW address yet */ 2265 sock = socket(PF_INET, SOCK_STREAM, 0); 2266 if (sock == -1) { 2267 error_setg_errno(errp, errno, "failed to create socket"); 2268 goto error; 2269 } 2270 2271 memset(&ifr, 0, sizeof(ifr)); 2272 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 2273 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 2274 error_setg_errno(errp, errno, 2275 "failed to get MAC address of %s", 2276 ifa->ifa_name); 2277 close(sock); 2278 goto error; 2279 } 2280 2281 close(sock); 2282 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 2283 2284 info->value->hardware_address = 2285 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2286 (int) mac_addr[0], (int) mac_addr[1], 2287 (int) mac_addr[2], (int) mac_addr[3], 2288 (int) mac_addr[4], (int) mac_addr[5]); 2289 2290 info->value->has_hardware_address = true; 2291 } 2292 2293 if (ifa->ifa_addr && 2294 ifa->ifa_addr->sa_family == AF_INET) { 2295 /* interface with IPv4 address */ 2296 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2297 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2298 error_setg_errno(errp, errno, "inet_ntop failed"); 2299 goto error; 2300 } 2301 2302 address_item = g_malloc0(sizeof(*address_item)); 2303 address_item->value = g_malloc0(sizeof(*address_item->value)); 2304 address_item->value->ip_address = g_strdup(addr4); 2305 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2306 2307 if (ifa->ifa_netmask) { 2308 /* Count the number of set bits in netmask. 2309 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2310 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2311 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 2312 } 2313 } else if (ifa->ifa_addr && 2314 ifa->ifa_addr->sa_family == AF_INET6) { 2315 /* interface with IPv6 address */ 2316 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2317 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2318 error_setg_errno(errp, errno, "inet_ntop failed"); 2319 goto error; 2320 } 2321 2322 address_item = g_malloc0(sizeof(*address_item)); 2323 address_item->value = g_malloc0(sizeof(*address_item->value)); 2324 address_item->value->ip_address = g_strdup(addr6); 2325 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2326 2327 if (ifa->ifa_netmask) { 2328 /* Count the number of set bits in netmask. 2329 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2330 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2331 address_item->value->prefix = 2332 ctpop32(((uint32_t *) p)[0]) + 2333 ctpop32(((uint32_t *) p)[1]) + 2334 ctpop32(((uint32_t *) p)[2]) + 2335 ctpop32(((uint32_t *) p)[3]); 2336 } 2337 } 2338 2339 if (!address_item) { 2340 continue; 2341 } 2342 2343 address_list = &info->value->ip_addresses; 2344 2345 while (*address_list && (*address_list)->next) { 2346 address_list = &(*address_list)->next; 2347 } 2348 2349 if (!*address_list) { 2350 *address_list = address_item; 2351 } else { 2352 (*address_list)->next = address_item; 2353 } 2354 2355 info->value->has_ip_addresses = true; 2356 2357 if (!info->value->has_statistics) { 2358 interface_stat = g_malloc0(sizeof(*interface_stat)); 2359 if (guest_get_network_stats(info->value->name, 2360 interface_stat) == -1) { 2361 info->value->has_statistics = false; 2362 g_free(interface_stat); 2363 } else { 2364 info->value->statistics = interface_stat; 2365 info->value->has_statistics = true; 2366 } 2367 } 2368 } 2369 2370 freeifaddrs(ifap); 2371 return head; 2372 2373 error: 2374 freeifaddrs(ifap); 2375 qapi_free_GuestNetworkInterfaceList(head); 2376 return NULL; 2377 } 2378 2379 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 2380 2381 static long sysconf_exact(int name, const char *name_str, Error **errp) 2382 { 2383 long ret; 2384 2385 errno = 0; 2386 ret = sysconf(name); 2387 if (ret == -1) { 2388 if (errno == 0) { 2389 error_setg(errp, "sysconf(%s): value indefinite", name_str); 2390 } else { 2391 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 2392 } 2393 } 2394 return ret; 2395 } 2396 2397 /* Transfer online/offline status between @vcpu and the guest system. 2398 * 2399 * On input either @errp or *@errp must be NULL. 2400 * 2401 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2402 * - R: vcpu->logical_id 2403 * - W: vcpu->online 2404 * - W: vcpu->can_offline 2405 * 2406 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2407 * - R: vcpu->logical_id 2408 * - R: vcpu->online 2409 * 2410 * Written members remain unmodified on error. 2411 */ 2412 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2413 char *dirpath, Error **errp) 2414 { 2415 int fd; 2416 int res; 2417 int dirfd; 2418 static const char fn[] = "online"; 2419 2420 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2421 if (dirfd == -1) { 2422 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2423 return; 2424 } 2425 2426 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2427 if (fd == -1) { 2428 if (errno != ENOENT) { 2429 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2430 } else if (sys2vcpu) { 2431 vcpu->online = true; 2432 vcpu->can_offline = false; 2433 } else if (!vcpu->online) { 2434 error_setg(errp, "logical processor #%" PRId64 " can't be " 2435 "offlined", vcpu->logical_id); 2436 } /* otherwise pretend successful re-onlining */ 2437 } else { 2438 unsigned char status; 2439 2440 res = pread(fd, &status, 1, 0); 2441 if (res == -1) { 2442 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2443 } else if (res == 0) { 2444 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2445 fn); 2446 } else if (sys2vcpu) { 2447 vcpu->online = (status != '0'); 2448 vcpu->can_offline = true; 2449 } else if (vcpu->online != (status != '0')) { 2450 status = '0' + vcpu->online; 2451 if (pwrite(fd, &status, 1, 0) == -1) { 2452 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2453 fn); 2454 } 2455 } /* otherwise pretend successful re-(on|off)-lining */ 2456 2457 res = close(fd); 2458 g_assert(res == 0); 2459 } 2460 2461 res = close(dirfd); 2462 g_assert(res == 0); 2463 } 2464 2465 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2466 { 2467 int64_t current; 2468 GuestLogicalProcessorList *head, **link; 2469 long sc_max; 2470 Error *local_err = NULL; 2471 2472 current = 0; 2473 head = NULL; 2474 link = &head; 2475 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 2476 2477 while (local_err == NULL && current < sc_max) { 2478 GuestLogicalProcessor *vcpu; 2479 GuestLogicalProcessorList *entry; 2480 int64_t id = current++; 2481 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2482 id); 2483 2484 if (g_file_test(path, G_FILE_TEST_EXISTS)) { 2485 vcpu = g_malloc0(sizeof *vcpu); 2486 vcpu->logical_id = id; 2487 vcpu->has_can_offline = true; /* lolspeak ftw */ 2488 transfer_vcpu(vcpu, true, path, &local_err); 2489 entry = g_malloc0(sizeof *entry); 2490 entry->value = vcpu; 2491 *link = entry; 2492 link = &entry->next; 2493 } 2494 g_free(path); 2495 } 2496 2497 if (local_err == NULL) { 2498 /* there's no guest with zero VCPUs */ 2499 g_assert(head != NULL); 2500 return head; 2501 } 2502 2503 qapi_free_GuestLogicalProcessorList(head); 2504 error_propagate(errp, local_err); 2505 return NULL; 2506 } 2507 2508 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2509 { 2510 int64_t processed; 2511 Error *local_err = NULL; 2512 2513 processed = 0; 2514 while (vcpus != NULL) { 2515 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2516 vcpus->value->logical_id); 2517 2518 transfer_vcpu(vcpus->value, false, path, &local_err); 2519 g_free(path); 2520 if (local_err != NULL) { 2521 break; 2522 } 2523 ++processed; 2524 vcpus = vcpus->next; 2525 } 2526 2527 if (local_err != NULL) { 2528 if (processed == 0) { 2529 error_propagate(errp, local_err); 2530 } else { 2531 error_free(local_err); 2532 } 2533 } 2534 2535 return processed; 2536 } 2537 2538 void qmp_guest_set_user_password(const char *username, 2539 const char *password, 2540 bool crypted, 2541 Error **errp) 2542 { 2543 Error *local_err = NULL; 2544 char *passwd_path = NULL; 2545 pid_t pid; 2546 int status; 2547 int datafd[2] = { -1, -1 }; 2548 char *rawpasswddata = NULL; 2549 size_t rawpasswdlen; 2550 char *chpasswddata = NULL; 2551 size_t chpasswdlen; 2552 2553 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 2554 if (!rawpasswddata) { 2555 return; 2556 } 2557 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 2558 rawpasswddata[rawpasswdlen] = '\0'; 2559 2560 if (strchr(rawpasswddata, '\n')) { 2561 error_setg(errp, "forbidden characters in raw password"); 2562 goto out; 2563 } 2564 2565 if (strchr(username, '\n') || 2566 strchr(username, ':')) { 2567 error_setg(errp, "forbidden characters in username"); 2568 goto out; 2569 } 2570 2571 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 2572 chpasswdlen = strlen(chpasswddata); 2573 2574 passwd_path = g_find_program_in_path("chpasswd"); 2575 2576 if (!passwd_path) { 2577 error_setg(errp, "cannot find 'passwd' program in PATH"); 2578 goto out; 2579 } 2580 2581 if (pipe(datafd) < 0) { 2582 error_setg(errp, "cannot create pipe FDs"); 2583 goto out; 2584 } 2585 2586 pid = fork(); 2587 if (pid == 0) { 2588 close(datafd[1]); 2589 /* child */ 2590 setsid(); 2591 dup2(datafd[0], 0); 2592 reopen_fd_to_null(1); 2593 reopen_fd_to_null(2); 2594 2595 if (crypted) { 2596 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2597 } else { 2598 execle(passwd_path, "chpasswd", NULL, environ); 2599 } 2600 _exit(EXIT_FAILURE); 2601 } else if (pid < 0) { 2602 error_setg_errno(errp, errno, "failed to create child process"); 2603 goto out; 2604 } 2605 close(datafd[0]); 2606 datafd[0] = -1; 2607 2608 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2609 error_setg_errno(errp, errno, "cannot write new account password"); 2610 goto out; 2611 } 2612 close(datafd[1]); 2613 datafd[1] = -1; 2614 2615 ga_wait_child(pid, &status, &local_err); 2616 if (local_err) { 2617 error_propagate(errp, local_err); 2618 goto out; 2619 } 2620 2621 if (!WIFEXITED(status)) { 2622 error_setg(errp, "child process has terminated abnormally"); 2623 goto out; 2624 } 2625 2626 if (WEXITSTATUS(status)) { 2627 error_setg(errp, "child process has failed to set user password"); 2628 goto out; 2629 } 2630 2631 out: 2632 g_free(chpasswddata); 2633 g_free(rawpasswddata); 2634 g_free(passwd_path); 2635 if (datafd[0] != -1) { 2636 close(datafd[0]); 2637 } 2638 if (datafd[1] != -1) { 2639 close(datafd[1]); 2640 } 2641 } 2642 2643 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2644 int size, Error **errp) 2645 { 2646 int fd; 2647 int res; 2648 2649 errno = 0; 2650 fd = openat(dirfd, pathname, O_RDONLY); 2651 if (fd == -1) { 2652 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2653 return; 2654 } 2655 2656 res = pread(fd, buf, size, 0); 2657 if (res == -1) { 2658 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2659 } else if (res == 0) { 2660 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2661 } 2662 close(fd); 2663 } 2664 2665 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2666 const char *buf, int size, Error **errp) 2667 { 2668 int fd; 2669 2670 errno = 0; 2671 fd = openat(dirfd, pathname, O_WRONLY); 2672 if (fd == -1) { 2673 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2674 return; 2675 } 2676 2677 if (pwrite(fd, buf, size, 0) == -1) { 2678 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2679 } 2680 2681 close(fd); 2682 } 2683 2684 /* Transfer online/offline status between @mem_blk and the guest system. 2685 * 2686 * On input either @errp or *@errp must be NULL. 2687 * 2688 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2689 * - R: mem_blk->phys_index 2690 * - W: mem_blk->online 2691 * - W: mem_blk->can_offline 2692 * 2693 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2694 * - R: mem_blk->phys_index 2695 * - R: mem_blk->online 2696 *- R: mem_blk->can_offline 2697 * Written members remain unmodified on error. 2698 */ 2699 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2700 GuestMemoryBlockResponse *result, 2701 Error **errp) 2702 { 2703 char *dirpath; 2704 int dirfd; 2705 char *status; 2706 Error *local_err = NULL; 2707 2708 if (!sys2memblk) { 2709 DIR *dp; 2710 2711 if (!result) { 2712 error_setg(errp, "Internal error, 'result' should not be NULL"); 2713 return; 2714 } 2715 errno = 0; 2716 dp = opendir("/sys/devices/system/memory/"); 2717 /* if there is no 'memory' directory in sysfs, 2718 * we think this VM does not support online/offline memory block, 2719 * any other solution? 2720 */ 2721 if (!dp) { 2722 if (errno == ENOENT) { 2723 result->response = 2724 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2725 } 2726 goto out1; 2727 } 2728 closedir(dp); 2729 } 2730 2731 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2732 mem_blk->phys_index); 2733 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2734 if (dirfd == -1) { 2735 if (sys2memblk) { 2736 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2737 } else { 2738 if (errno == ENOENT) { 2739 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2740 } else { 2741 result->response = 2742 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2743 } 2744 } 2745 g_free(dirpath); 2746 goto out1; 2747 } 2748 g_free(dirpath); 2749 2750 status = g_malloc0(10); 2751 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2752 if (local_err) { 2753 /* treat with sysfs file that not exist in old kernel */ 2754 if (errno == ENOENT) { 2755 error_free(local_err); 2756 if (sys2memblk) { 2757 mem_blk->online = true; 2758 mem_blk->can_offline = false; 2759 } else if (!mem_blk->online) { 2760 result->response = 2761 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2762 } 2763 } else { 2764 if (sys2memblk) { 2765 error_propagate(errp, local_err); 2766 } else { 2767 error_free(local_err); 2768 result->response = 2769 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2770 } 2771 } 2772 goto out2; 2773 } 2774 2775 if (sys2memblk) { 2776 char removable = '0'; 2777 2778 mem_blk->online = (strncmp(status, "online", 6) == 0); 2779 2780 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2781 if (local_err) { 2782 /* if no 'removable' file, it doesn't support offline mem blk */ 2783 if (errno == ENOENT) { 2784 error_free(local_err); 2785 mem_blk->can_offline = false; 2786 } else { 2787 error_propagate(errp, local_err); 2788 } 2789 } else { 2790 mem_blk->can_offline = (removable != '0'); 2791 } 2792 } else { 2793 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2794 const char *new_state = mem_blk->online ? "online" : "offline"; 2795 2796 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2797 &local_err); 2798 if (local_err) { 2799 error_free(local_err); 2800 result->response = 2801 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2802 goto out2; 2803 } 2804 2805 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2806 result->has_error_code = false; 2807 } /* otherwise pretend successful re-(on|off)-lining */ 2808 } 2809 g_free(status); 2810 close(dirfd); 2811 return; 2812 2813 out2: 2814 g_free(status); 2815 close(dirfd); 2816 out1: 2817 if (!sys2memblk) { 2818 result->has_error_code = true; 2819 result->error_code = errno; 2820 } 2821 } 2822 2823 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2824 { 2825 GuestMemoryBlockList *head, **link; 2826 Error *local_err = NULL; 2827 struct dirent *de; 2828 DIR *dp; 2829 2830 head = NULL; 2831 link = &head; 2832 2833 dp = opendir("/sys/devices/system/memory/"); 2834 if (!dp) { 2835 /* it's ok if this happens to be a system that doesn't expose 2836 * memory blocks via sysfs, but otherwise we should report 2837 * an error 2838 */ 2839 if (errno != ENOENT) { 2840 error_setg_errno(errp, errno, "Can't open directory" 2841 "\"/sys/devices/system/memory/\""); 2842 } 2843 return NULL; 2844 } 2845 2846 /* Note: the phys_index of memory block may be discontinuous, 2847 * this is because a memblk is the unit of the Sparse Memory design, which 2848 * allows discontinuous memory ranges (ex. NUMA), so here we should 2849 * traverse the memory block directory. 2850 */ 2851 while ((de = readdir(dp)) != NULL) { 2852 GuestMemoryBlock *mem_blk; 2853 GuestMemoryBlockList *entry; 2854 2855 if ((strncmp(de->d_name, "memory", 6) != 0) || 2856 !(de->d_type & DT_DIR)) { 2857 continue; 2858 } 2859 2860 mem_blk = g_malloc0(sizeof *mem_blk); 2861 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2862 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2863 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2864 transfer_memory_block(mem_blk, true, NULL, &local_err); 2865 if (local_err) { 2866 break; 2867 } 2868 2869 entry = g_malloc0(sizeof *entry); 2870 entry->value = mem_blk; 2871 2872 *link = entry; 2873 link = &entry->next; 2874 } 2875 2876 closedir(dp); 2877 if (local_err == NULL) { 2878 /* there's no guest with zero memory blocks */ 2879 if (head == NULL) { 2880 error_setg(errp, "guest reported zero memory blocks!"); 2881 } 2882 return head; 2883 } 2884 2885 qapi_free_GuestMemoryBlockList(head); 2886 error_propagate(errp, local_err); 2887 return NULL; 2888 } 2889 2890 GuestMemoryBlockResponseList * 2891 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2892 { 2893 GuestMemoryBlockResponseList *head, **link; 2894 Error *local_err = NULL; 2895 2896 head = NULL; 2897 link = &head; 2898 2899 while (mem_blks != NULL) { 2900 GuestMemoryBlockResponse *result; 2901 GuestMemoryBlockResponseList *entry; 2902 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2903 2904 result = g_malloc0(sizeof(*result)); 2905 result->phys_index = current_mem_blk->phys_index; 2906 transfer_memory_block(current_mem_blk, false, result, &local_err); 2907 if (local_err) { /* should never happen */ 2908 goto err; 2909 } 2910 entry = g_malloc0(sizeof *entry); 2911 entry->value = result; 2912 2913 *link = entry; 2914 link = &entry->next; 2915 mem_blks = mem_blks->next; 2916 } 2917 2918 return head; 2919 err: 2920 qapi_free_GuestMemoryBlockResponseList(head); 2921 error_propagate(errp, local_err); 2922 return NULL; 2923 } 2924 2925 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2926 { 2927 Error *local_err = NULL; 2928 char *dirpath; 2929 int dirfd; 2930 char *buf; 2931 GuestMemoryBlockInfo *info; 2932 2933 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2934 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2935 if (dirfd == -1) { 2936 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2937 g_free(dirpath); 2938 return NULL; 2939 } 2940 g_free(dirpath); 2941 2942 buf = g_malloc0(20); 2943 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2944 close(dirfd); 2945 if (local_err) { 2946 g_free(buf); 2947 error_propagate(errp, local_err); 2948 return NULL; 2949 } 2950 2951 info = g_new0(GuestMemoryBlockInfo, 1); 2952 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2953 2954 g_free(buf); 2955 2956 return info; 2957 } 2958 2959 #else /* defined(__linux__) */ 2960 2961 void qmp_guest_suspend_disk(Error **errp) 2962 { 2963 error_setg(errp, QERR_UNSUPPORTED); 2964 } 2965 2966 void qmp_guest_suspend_ram(Error **errp) 2967 { 2968 error_setg(errp, QERR_UNSUPPORTED); 2969 } 2970 2971 void qmp_guest_suspend_hybrid(Error **errp) 2972 { 2973 error_setg(errp, QERR_UNSUPPORTED); 2974 } 2975 2976 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2977 { 2978 error_setg(errp, QERR_UNSUPPORTED); 2979 return NULL; 2980 } 2981 2982 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2983 { 2984 error_setg(errp, QERR_UNSUPPORTED); 2985 return NULL; 2986 } 2987 2988 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2989 { 2990 error_setg(errp, QERR_UNSUPPORTED); 2991 return -1; 2992 } 2993 2994 void qmp_guest_set_user_password(const char *username, 2995 const char *password, 2996 bool crypted, 2997 Error **errp) 2998 { 2999 error_setg(errp, QERR_UNSUPPORTED); 3000 } 3001 3002 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 3003 { 3004 error_setg(errp, QERR_UNSUPPORTED); 3005 return NULL; 3006 } 3007 3008 GuestMemoryBlockResponseList * 3009 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 3010 { 3011 error_setg(errp, QERR_UNSUPPORTED); 3012 return NULL; 3013 } 3014 3015 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 3016 { 3017 error_setg(errp, QERR_UNSUPPORTED); 3018 return NULL; 3019 } 3020 3021 #endif 3022 3023 #if !defined(CONFIG_FSFREEZE) 3024 3025 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 3026 { 3027 error_setg(errp, QERR_UNSUPPORTED); 3028 return NULL; 3029 } 3030 3031 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 3032 { 3033 error_setg(errp, QERR_UNSUPPORTED); 3034 3035 return 0; 3036 } 3037 3038 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 3039 { 3040 error_setg(errp, QERR_UNSUPPORTED); 3041 3042 return 0; 3043 } 3044 3045 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 3046 strList *mountpoints, 3047 Error **errp) 3048 { 3049 error_setg(errp, QERR_UNSUPPORTED); 3050 3051 return 0; 3052 } 3053 3054 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 3055 { 3056 error_setg(errp, QERR_UNSUPPORTED); 3057 3058 return 0; 3059 } 3060 3061 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 3062 { 3063 error_setg(errp, QERR_UNSUPPORTED); 3064 return NULL; 3065 } 3066 3067 #endif /* CONFIG_FSFREEZE */ 3068 3069 #if !defined(CONFIG_FSTRIM) 3070 GuestFilesystemTrimResponse * 3071 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 3072 { 3073 error_setg(errp, QERR_UNSUPPORTED); 3074 return NULL; 3075 } 3076 #endif 3077 3078 /* add unsupported commands to the blacklist */ 3079 GList *ga_command_blacklist_init(GList *blacklist) 3080 { 3081 #if !defined(__linux__) 3082 { 3083 const char *list[] = { 3084 "guest-suspend-disk", "guest-suspend-ram", 3085 "guest-suspend-hybrid", "guest-network-get-interfaces", 3086 "guest-get-vcpus", "guest-set-vcpus", 3087 "guest-get-memory-blocks", "guest-set-memory-blocks", 3088 "guest-get-memory-block-size", "guest-get-memory-block-info", 3089 NULL}; 3090 char **p = (char **)list; 3091 3092 while (*p) { 3093 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3094 } 3095 } 3096 #endif 3097 3098 #if !defined(CONFIG_FSFREEZE) 3099 { 3100 const char *list[] = { 3101 "guest-get-fsinfo", "guest-fsfreeze-status", 3102 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 3103 "guest-fsfreeze-thaw", "guest-get-fsinfo", 3104 "guest-get-disks", NULL}; 3105 char **p = (char **)list; 3106 3107 while (*p) { 3108 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3109 } 3110 } 3111 #endif 3112 3113 #if !defined(CONFIG_FSTRIM) 3114 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 3115 #endif 3116 3117 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 3118 3119 return blacklist; 3120 } 3121 3122 /* register init/cleanup routines for stateful command groups */ 3123 void ga_command_state_init(GAState *s, GACommandState *cs) 3124 { 3125 #if defined(CONFIG_FSFREEZE) 3126 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 3127 #endif 3128 } 3129 3130 #ifdef HAVE_UTMPX 3131 3132 #define QGA_MICRO_SECOND_TO_SECOND 1000000 3133 3134 static double ga_get_login_time(struct utmpx *user_info) 3135 { 3136 double seconds = (double)user_info->ut_tv.tv_sec; 3137 double useconds = (double)user_info->ut_tv.tv_usec; 3138 useconds /= QGA_MICRO_SECOND_TO_SECOND; 3139 return seconds + useconds; 3140 } 3141 3142 GuestUserList *qmp_guest_get_users(Error **errp) 3143 { 3144 GHashTable *cache = NULL; 3145 GuestUserList *head = NULL, *cur_item = NULL; 3146 struct utmpx *user_info = NULL; 3147 gpointer value = NULL; 3148 GuestUser *user = NULL; 3149 GuestUserList *item = NULL; 3150 double login_time = 0; 3151 3152 cache = g_hash_table_new(g_str_hash, g_str_equal); 3153 setutxent(); 3154 3155 for (;;) { 3156 user_info = getutxent(); 3157 if (user_info == NULL) { 3158 break; 3159 } else if (user_info->ut_type != USER_PROCESS) { 3160 continue; 3161 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 3162 value = g_hash_table_lookup(cache, user_info->ut_user); 3163 user = (GuestUser *)value; 3164 login_time = ga_get_login_time(user_info); 3165 /* We're ensuring the earliest login time to be sent */ 3166 if (login_time < user->login_time) { 3167 user->login_time = login_time; 3168 } 3169 continue; 3170 } 3171 3172 item = g_new0(GuestUserList, 1); 3173 item->value = g_new0(GuestUser, 1); 3174 item->value->user = g_strdup(user_info->ut_user); 3175 item->value->login_time = ga_get_login_time(user_info); 3176 3177 g_hash_table_insert(cache, item->value->user, item->value); 3178 3179 if (!cur_item) { 3180 head = cur_item = item; 3181 } else { 3182 cur_item->next = item; 3183 cur_item = item; 3184 } 3185 } 3186 endutxent(); 3187 g_hash_table_destroy(cache); 3188 return head; 3189 } 3190 3191 #else 3192 3193 GuestUserList *qmp_guest_get_users(Error **errp) 3194 { 3195 error_setg(errp, QERR_UNSUPPORTED); 3196 return NULL; 3197 } 3198 3199 #endif 3200 3201 /* Replace escaped special characters with theire real values. The replacement 3202 * is done in place -- returned value is in the original string. 3203 */ 3204 static void ga_osrelease_replace_special(gchar *value) 3205 { 3206 gchar *p, *p2, quote; 3207 3208 /* Trim the string at first space or semicolon if it is not enclosed in 3209 * single or double quotes. */ 3210 if ((value[0] != '"') || (value[0] == '\'')) { 3211 p = strchr(value, ' '); 3212 if (p != NULL) { 3213 *p = 0; 3214 } 3215 p = strchr(value, ';'); 3216 if (p != NULL) { 3217 *p = 0; 3218 } 3219 return; 3220 } 3221 3222 quote = value[0]; 3223 p2 = value; 3224 p = value + 1; 3225 while (*p != 0) { 3226 if (*p == '\\') { 3227 p++; 3228 switch (*p) { 3229 case '$': 3230 case '\'': 3231 case '"': 3232 case '\\': 3233 case '`': 3234 break; 3235 default: 3236 /* Keep literal backslash followed by whatever is there */ 3237 p--; 3238 break; 3239 } 3240 } else if (*p == quote) { 3241 *p2 = 0; 3242 break; 3243 } 3244 *(p2++) = *(p++); 3245 } 3246 } 3247 3248 static GKeyFile *ga_parse_osrelease(const char *fname) 3249 { 3250 gchar *content = NULL; 3251 gchar *content2 = NULL; 3252 GError *err = NULL; 3253 GKeyFile *keys = g_key_file_new(); 3254 const char *group = "[os-release]\n"; 3255 3256 if (!g_file_get_contents(fname, &content, NULL, &err)) { 3257 slog("failed to read '%s', error: %s", fname, err->message); 3258 goto fail; 3259 } 3260 3261 if (!g_utf8_validate(content, -1, NULL)) { 3262 slog("file is not utf-8 encoded: %s", fname); 3263 goto fail; 3264 } 3265 content2 = g_strdup_printf("%s%s", group, content); 3266 3267 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 3268 &err)) { 3269 slog("failed to parse file '%s', error: %s", fname, err->message); 3270 goto fail; 3271 } 3272 3273 g_free(content); 3274 g_free(content2); 3275 return keys; 3276 3277 fail: 3278 g_error_free(err); 3279 g_free(content); 3280 g_free(content2); 3281 g_key_file_free(keys); 3282 return NULL; 3283 } 3284 3285 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 3286 { 3287 GuestOSInfo *info = NULL; 3288 struct utsname kinfo; 3289 GKeyFile *osrelease = NULL; 3290 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 3291 3292 info = g_new0(GuestOSInfo, 1); 3293 3294 if (uname(&kinfo) != 0) { 3295 error_setg_errno(errp, errno, "uname failed"); 3296 } else { 3297 info->has_kernel_version = true; 3298 info->kernel_version = g_strdup(kinfo.version); 3299 info->has_kernel_release = true; 3300 info->kernel_release = g_strdup(kinfo.release); 3301 info->has_machine = true; 3302 info->machine = g_strdup(kinfo.machine); 3303 } 3304 3305 if (qga_os_release != NULL) { 3306 osrelease = ga_parse_osrelease(qga_os_release); 3307 } else { 3308 osrelease = ga_parse_osrelease("/etc/os-release"); 3309 if (osrelease == NULL) { 3310 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3311 } 3312 } 3313 3314 if (osrelease != NULL) { 3315 char *value; 3316 3317 #define GET_FIELD(field, osfield) do { \ 3318 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3319 if (value != NULL) { \ 3320 ga_osrelease_replace_special(value); \ 3321 info->has_ ## field = true; \ 3322 info->field = value; \ 3323 } \ 3324 } while (0) 3325 GET_FIELD(id, "ID"); 3326 GET_FIELD(name, "NAME"); 3327 GET_FIELD(pretty_name, "PRETTY_NAME"); 3328 GET_FIELD(version, "VERSION"); 3329 GET_FIELD(version_id, "VERSION_ID"); 3330 GET_FIELD(variant, "VARIANT"); 3331 GET_FIELD(variant_id, "VARIANT_ID"); 3332 #undef GET_FIELD 3333 3334 g_key_file_free(osrelease); 3335 } 3336 3337 return info; 3338 } 3339 3340 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3341 { 3342 error_setg(errp, QERR_UNSUPPORTED); 3343 3344 return NULL; 3345 } 3346