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