1 /* 2 * QEMU Guest Agent POSIX-specific command implementations 3 * 4 * Copyright IBM Corp. 2011 5 * 6 * Authors: 7 * Michael Roth <mdroth@linux.vnet.ibm.com> 8 * Michal Privoznik <mprivozn@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 */ 13 14 #include "qemu/osdep.h" 15 #include <sys/ioctl.h> 16 #include <sys/utsname.h> 17 #include <sys/wait.h> 18 #include <dirent.h> 19 #include "qemu-common.h" 20 #include "guest-agent-core.h" 21 #include "qga-qapi-commands.h" 22 #include "qapi/error.h" 23 #include "qapi/qmp/qerror.h" 24 #include "qemu/queue.h" 25 #include "qemu/host-utils.h" 26 #include "qemu/sockets.h" 27 #include "qemu/base64.h" 28 #include "qemu/cutils.h" 29 #include "commands-common.h" 30 31 #ifdef HAVE_UTMPX 32 #include <utmpx.h> 33 #endif 34 35 #ifndef CONFIG_HAS_ENVIRON 36 #ifdef __APPLE__ 37 #include <crt_externs.h> 38 #define environ (*_NSGetEnviron()) 39 #else 40 extern char **environ; 41 #endif 42 #endif 43 44 #if defined(__linux__) 45 #include <mntent.h> 46 #include <linux/fs.h> 47 #include <ifaddrs.h> 48 #include <arpa/inet.h> 49 #include <sys/socket.h> 50 #include <net/if.h> 51 #include <sys/statvfs.h> 52 53 #ifdef CONFIG_LIBUDEV 54 #include <libudev.h> 55 #endif 56 57 #ifdef FIFREEZE 58 #define CONFIG_FSFREEZE 59 #endif 60 #ifdef FITRIM 61 #define CONFIG_FSTRIM 62 #endif 63 #endif 64 65 static void ga_wait_child(pid_t pid, int *status, Error **errp) 66 { 67 pid_t rpid; 68 69 *status = 0; 70 71 do { 72 rpid = waitpid(pid, status, 0); 73 } while (rpid == -1 && errno == EINTR); 74 75 if (rpid == -1) { 76 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)", 77 pid); 78 return; 79 } 80 81 g_assert(rpid == pid); 82 } 83 84 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp) 85 { 86 const char *shutdown_flag; 87 Error *local_err = NULL; 88 pid_t pid; 89 int status; 90 91 slog("guest-shutdown called, mode: %s", mode); 92 if (!has_mode || strcmp(mode, "powerdown") == 0) { 93 shutdown_flag = "-P"; 94 } else if (strcmp(mode, "halt") == 0) { 95 shutdown_flag = "-H"; 96 } else if (strcmp(mode, "reboot") == 0) { 97 shutdown_flag = "-r"; 98 } else { 99 error_setg(errp, 100 "mode is invalid (valid values are: halt|powerdown|reboot"); 101 return; 102 } 103 104 pid = fork(); 105 if (pid == 0) { 106 /* child, start the shutdown */ 107 setsid(); 108 reopen_fd_to_null(0); 109 reopen_fd_to_null(1); 110 reopen_fd_to_null(2); 111 112 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0", 113 "hypervisor initiated shutdown", (char*)NULL, environ); 114 _exit(EXIT_FAILURE); 115 } else if (pid < 0) { 116 error_setg_errno(errp, errno, "failed to create child process"); 117 return; 118 } 119 120 ga_wait_child(pid, &status, &local_err); 121 if (local_err) { 122 error_propagate(errp, local_err); 123 return; 124 } 125 126 if (!WIFEXITED(status)) { 127 error_setg(errp, "child process has terminated abnormally"); 128 return; 129 } 130 131 if (WEXITSTATUS(status)) { 132 error_setg(errp, "child process has failed to shutdown"); 133 return; 134 } 135 136 /* succeeded */ 137 } 138 139 int64_t qmp_guest_get_time(Error **errp) 140 { 141 int ret; 142 qemu_timeval tq; 143 144 ret = qemu_gettimeofday(&tq); 145 if (ret < 0) { 146 error_setg_errno(errp, errno, "Failed to get time"); 147 return -1; 148 } 149 150 return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000; 151 } 152 153 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp) 154 { 155 int ret; 156 int status; 157 pid_t pid; 158 Error *local_err = NULL; 159 struct timeval tv; 160 static const char hwclock_path[] = "/sbin/hwclock"; 161 static int hwclock_available = -1; 162 163 if (hwclock_available < 0) { 164 hwclock_available = (access(hwclock_path, X_OK) == 0); 165 } 166 167 if (!hwclock_available) { 168 error_setg(errp, QERR_UNSUPPORTED); 169 return; 170 } 171 172 /* If user has passed a time, validate and set it. */ 173 if (has_time) { 174 GDate date = { 0, }; 175 176 /* year-2038 will overflow in case time_t is 32bit */ 177 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) { 178 error_setg(errp, "Time %" PRId64 " is too large", time_ns); 179 return; 180 } 181 182 tv.tv_sec = time_ns / 1000000000; 183 tv.tv_usec = (time_ns % 1000000000) / 1000; 184 g_date_set_time_t(&date, tv.tv_sec); 185 if (date.year < 1970 || date.year >= 2070) { 186 error_setg_errno(errp, errno, "Invalid time"); 187 return; 188 } 189 190 ret = settimeofday(&tv, NULL); 191 if (ret < 0) { 192 error_setg_errno(errp, errno, "Failed to set time to guest"); 193 return; 194 } 195 } 196 197 /* Now, if user has passed a time to set and the system time is set, we 198 * just need to synchronize the hardware clock. However, if no time was 199 * passed, user is requesting the opposite: set the system time from the 200 * hardware clock (RTC). */ 201 pid = fork(); 202 if (pid == 0) { 203 setsid(); 204 reopen_fd_to_null(0); 205 reopen_fd_to_null(1); 206 reopen_fd_to_null(2); 207 208 /* Use '/sbin/hwclock -w' to set RTC from the system time, 209 * or '/sbin/hwclock -s' to set the system time from RTC. */ 210 execle(hwclock_path, "hwclock", has_time ? "-w" : "-s", 211 NULL, environ); 212 _exit(EXIT_FAILURE); 213 } else if (pid < 0) { 214 error_setg_errno(errp, errno, "failed to create child process"); 215 return; 216 } 217 218 ga_wait_child(pid, &status, &local_err); 219 if (local_err) { 220 error_propagate(errp, local_err); 221 return; 222 } 223 224 if (!WIFEXITED(status)) { 225 error_setg(errp, "child process has terminated abnormally"); 226 return; 227 } 228 229 if (WEXITSTATUS(status)) { 230 error_setg(errp, "hwclock failed to set hardware clock to system time"); 231 return; 232 } 233 } 234 235 typedef enum { 236 RW_STATE_NEW, 237 RW_STATE_READING, 238 RW_STATE_WRITING, 239 } RwState; 240 241 struct GuestFileHandle { 242 uint64_t id; 243 FILE *fh; 244 RwState state; 245 QTAILQ_ENTRY(GuestFileHandle) next; 246 }; 247 248 static struct { 249 QTAILQ_HEAD(, GuestFileHandle) filehandles; 250 } guest_file_state = { 251 .filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles), 252 }; 253 254 static int64_t guest_file_handle_add(FILE *fh, Error **errp) 255 { 256 GuestFileHandle *gfh; 257 int64_t handle; 258 259 handle = ga_get_fd_handle(ga_state, errp); 260 if (handle < 0) { 261 return -1; 262 } 263 264 gfh = g_new0(GuestFileHandle, 1); 265 gfh->id = handle; 266 gfh->fh = fh; 267 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next); 268 269 return handle; 270 } 271 272 GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp) 273 { 274 GuestFileHandle *gfh; 275 276 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next) 277 { 278 if (gfh->id == id) { 279 return gfh; 280 } 281 } 282 283 error_setg(errp, "handle '%" PRId64 "' has not been found", id); 284 return NULL; 285 } 286 287 typedef const char * const ccpc; 288 289 #ifndef O_BINARY 290 #define O_BINARY 0 291 #endif 292 293 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */ 294 static const struct { 295 ccpc *forms; 296 int oflag_base; 297 } guest_file_open_modes[] = { 298 { (ccpc[]){ "r", NULL }, O_RDONLY }, 299 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY }, 300 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC }, 301 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY }, 302 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND }, 303 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY }, 304 { (ccpc[]){ "r+", NULL }, O_RDWR }, 305 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY }, 306 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC }, 307 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY }, 308 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND }, 309 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY } 310 }; 311 312 static int 313 find_open_flag(const char *mode_str, Error **errp) 314 { 315 unsigned mode; 316 317 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) { 318 ccpc *form; 319 320 form = guest_file_open_modes[mode].forms; 321 while (*form != NULL && strcmp(*form, mode_str) != 0) { 322 ++form; 323 } 324 if (*form != NULL) { 325 break; 326 } 327 } 328 329 if (mode == ARRAY_SIZE(guest_file_open_modes)) { 330 error_setg(errp, "invalid file open mode '%s'", mode_str); 331 return -1; 332 } 333 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK; 334 } 335 336 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \ 337 S_IRGRP | S_IWGRP | \ 338 S_IROTH | S_IWOTH) 339 340 static FILE * 341 safe_open_or_create(const char *path, const char *mode, Error **errp) 342 { 343 Error *local_err = NULL; 344 int oflag; 345 346 oflag = find_open_flag(mode, &local_err); 347 if (local_err == NULL) { 348 int fd; 349 350 /* If the caller wants / allows creation of a new file, we implement it 351 * with a two step process: open() + (open() / fchmod()). 352 * 353 * First we insist on creating the file exclusively as a new file. If 354 * that succeeds, we're free to set any file-mode bits on it. (The 355 * motivation is that we want to set those file-mode bits independently 356 * of the current umask.) 357 * 358 * If the exclusive creation fails because the file already exists 359 * (EEXIST is not possible for any other reason), we just attempt to 360 * open the file, but in this case we won't be allowed to change the 361 * file-mode bits on the preexistent file. 362 * 363 * The pathname should never disappear between the two open()s in 364 * practice. If it happens, then someone very likely tried to race us. 365 * In this case just go ahead and report the ENOENT from the second 366 * open() to the caller. 367 * 368 * If the caller wants to open a preexistent file, then the first 369 * open() is decisive and its third argument is ignored, and the second 370 * open() and the fchmod() are never called. 371 */ 372 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0); 373 if (fd == -1 && errno == EEXIST) { 374 oflag &= ~(unsigned)O_CREAT; 375 fd = open(path, oflag); 376 } 377 378 if (fd == -1) { 379 error_setg_errno(&local_err, errno, "failed to open file '%s' " 380 "(mode: '%s')", path, mode); 381 } else { 382 qemu_set_cloexec(fd); 383 384 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) { 385 error_setg_errno(&local_err, errno, "failed to set permission " 386 "0%03o on new file '%s' (mode: '%s')", 387 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode); 388 } else { 389 FILE *f; 390 391 f = fdopen(fd, mode); 392 if (f == NULL) { 393 error_setg_errno(&local_err, errno, "failed to associate " 394 "stdio stream with file descriptor %d, " 395 "file '%s' (mode: '%s')", fd, path, mode); 396 } else { 397 return f; 398 } 399 } 400 401 close(fd); 402 if (oflag & O_CREAT) { 403 unlink(path); 404 } 405 } 406 } 407 408 error_propagate(errp, local_err); 409 return NULL; 410 } 411 412 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, 413 Error **errp) 414 { 415 FILE *fh; 416 Error *local_err = NULL; 417 int64_t handle; 418 419 if (!has_mode) { 420 mode = "r"; 421 } 422 slog("guest-file-open called, filepath: %s, mode: %s", path, mode); 423 fh = safe_open_or_create(path, mode, &local_err); 424 if (local_err != NULL) { 425 error_propagate(errp, local_err); 426 return -1; 427 } 428 429 /* set fd non-blocking to avoid common use cases (like reading from a 430 * named pipe) from hanging the agent 431 */ 432 qemu_set_nonblock(fileno(fh)); 433 434 handle = guest_file_handle_add(fh, errp); 435 if (handle < 0) { 436 fclose(fh); 437 return -1; 438 } 439 440 slog("guest-file-open, handle: %" PRId64, handle); 441 return handle; 442 } 443 444 void qmp_guest_file_close(int64_t handle, Error **errp) 445 { 446 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 447 int ret; 448 449 slog("guest-file-close called, handle: %" PRId64, handle); 450 if (!gfh) { 451 return; 452 } 453 454 ret = fclose(gfh->fh); 455 if (ret == EOF) { 456 error_setg_errno(errp, errno, "failed to close handle"); 457 return; 458 } 459 460 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next); 461 g_free(gfh); 462 } 463 464 GuestFileRead *guest_file_read_unsafe(GuestFileHandle *gfh, 465 int64_t count, Error **errp) 466 { 467 GuestFileRead *read_data = NULL; 468 guchar *buf; 469 FILE *fh = gfh->fh; 470 size_t read_count; 471 472 /* explicitly flush when switching from writing to reading */ 473 if (gfh->state == RW_STATE_WRITING) { 474 int ret = fflush(fh); 475 if (ret == EOF) { 476 error_setg_errno(errp, errno, "failed to flush file"); 477 return NULL; 478 } 479 gfh->state = RW_STATE_NEW; 480 } 481 482 buf = g_malloc0(count+1); 483 read_count = fread(buf, 1, count, fh); 484 if (ferror(fh)) { 485 error_setg_errno(errp, errno, "failed to read file"); 486 } else { 487 buf[read_count] = 0; 488 read_data = g_new0(GuestFileRead, 1); 489 read_data->count = read_count; 490 read_data->eof = feof(fh); 491 if (read_count) { 492 read_data->buf_b64 = g_base64_encode(buf, read_count); 493 } 494 gfh->state = RW_STATE_READING; 495 } 496 g_free(buf); 497 clearerr(fh); 498 499 return read_data; 500 } 501 502 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64, 503 bool has_count, int64_t count, 504 Error **errp) 505 { 506 GuestFileWrite *write_data = NULL; 507 guchar *buf; 508 gsize buf_len; 509 int write_count; 510 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 511 FILE *fh; 512 513 if (!gfh) { 514 return NULL; 515 } 516 517 fh = gfh->fh; 518 519 if (gfh->state == RW_STATE_READING) { 520 int ret = fseek(fh, 0, SEEK_CUR); 521 if (ret == -1) { 522 error_setg_errno(errp, errno, "failed to seek file"); 523 return NULL; 524 } 525 gfh->state = RW_STATE_NEW; 526 } 527 528 buf = qbase64_decode(buf_b64, -1, &buf_len, errp); 529 if (!buf) { 530 return NULL; 531 } 532 533 if (!has_count) { 534 count = buf_len; 535 } else if (count < 0 || count > buf_len) { 536 error_setg(errp, "value '%" PRId64 "' is invalid for argument count", 537 count); 538 g_free(buf); 539 return NULL; 540 } 541 542 write_count = fwrite(buf, 1, count, fh); 543 if (ferror(fh)) { 544 error_setg_errno(errp, errno, "failed to write to file"); 545 slog("guest-file-write failed, handle: %" PRId64, handle); 546 } else { 547 write_data = g_new0(GuestFileWrite, 1); 548 write_data->count = write_count; 549 write_data->eof = feof(fh); 550 gfh->state = RW_STATE_WRITING; 551 } 552 g_free(buf); 553 clearerr(fh); 554 555 return write_data; 556 } 557 558 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset, 559 GuestFileWhence *whence_code, 560 Error **errp) 561 { 562 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 563 GuestFileSeek *seek_data = NULL; 564 FILE *fh; 565 int ret; 566 int whence; 567 Error *err = NULL; 568 569 if (!gfh) { 570 return NULL; 571 } 572 573 /* We stupidly exposed 'whence':'int' in our qapi */ 574 whence = ga_parse_whence(whence_code, &err); 575 if (err) { 576 error_propagate(errp, err); 577 return NULL; 578 } 579 580 fh = gfh->fh; 581 ret = fseek(fh, offset, whence); 582 if (ret == -1) { 583 error_setg_errno(errp, errno, "failed to seek file"); 584 if (errno == ESPIPE) { 585 /* file is non-seekable, stdio shouldn't be buffering anyways */ 586 gfh->state = RW_STATE_NEW; 587 } 588 } else { 589 seek_data = g_new0(GuestFileSeek, 1); 590 seek_data->position = ftell(fh); 591 seek_data->eof = feof(fh); 592 gfh->state = RW_STATE_NEW; 593 } 594 clearerr(fh); 595 596 return seek_data; 597 } 598 599 void qmp_guest_file_flush(int64_t handle, Error **errp) 600 { 601 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 602 FILE *fh; 603 int ret; 604 605 if (!gfh) { 606 return; 607 } 608 609 fh = gfh->fh; 610 ret = fflush(fh); 611 if (ret == EOF) { 612 error_setg_errno(errp, errno, "failed to flush file"); 613 } else { 614 gfh->state = RW_STATE_NEW; 615 } 616 } 617 618 /* linux-specific implementations. avoid this if at all possible. */ 619 #if defined(__linux__) 620 621 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM) 622 typedef struct FsMount { 623 char *dirname; 624 char *devtype; 625 unsigned int devmajor, devminor; 626 QTAILQ_ENTRY(FsMount) next; 627 } FsMount; 628 629 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList; 630 631 static void free_fs_mount_list(FsMountList *mounts) 632 { 633 FsMount *mount, *temp; 634 635 if (!mounts) { 636 return; 637 } 638 639 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) { 640 QTAILQ_REMOVE(mounts, mount, next); 641 g_free(mount->dirname); 642 g_free(mount->devtype); 643 g_free(mount); 644 } 645 } 646 647 static int dev_major_minor(const char *devpath, 648 unsigned int *devmajor, unsigned int *devminor) 649 { 650 struct stat st; 651 652 *devmajor = 0; 653 *devminor = 0; 654 655 if (stat(devpath, &st) < 0) { 656 slog("failed to stat device file '%s': %s", devpath, strerror(errno)); 657 return -1; 658 } 659 if (S_ISDIR(st.st_mode)) { 660 /* It is bind mount */ 661 return -2; 662 } 663 if (S_ISBLK(st.st_mode)) { 664 *devmajor = major(st.st_rdev); 665 *devminor = minor(st.st_rdev); 666 return 0; 667 } 668 return -1; 669 } 670 671 /* 672 * Walk the mount table and build a list of local file systems 673 */ 674 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp) 675 { 676 struct mntent *ment; 677 FsMount *mount; 678 char const *mtab = "/proc/self/mounts"; 679 FILE *fp; 680 unsigned int devmajor, devminor; 681 682 fp = setmntent(mtab, "r"); 683 if (!fp) { 684 error_setg(errp, "failed to open mtab file: '%s'", mtab); 685 return; 686 } 687 688 while ((ment = getmntent(fp))) { 689 /* 690 * An entry which device name doesn't start with a '/' is 691 * either a dummy file system or a network file system. 692 * Add special handling for smbfs and cifs as is done by 693 * coreutils as well. 694 */ 695 if ((ment->mnt_fsname[0] != '/') || 696 (strcmp(ment->mnt_type, "smbfs") == 0) || 697 (strcmp(ment->mnt_type, "cifs") == 0)) { 698 continue; 699 } 700 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) { 701 /* Skip bind mounts */ 702 continue; 703 } 704 705 mount = g_new0(FsMount, 1); 706 mount->dirname = g_strdup(ment->mnt_dir); 707 mount->devtype = g_strdup(ment->mnt_type); 708 mount->devmajor = devmajor; 709 mount->devminor = devminor; 710 711 QTAILQ_INSERT_TAIL(mounts, mount, next); 712 } 713 714 endmntent(fp); 715 } 716 717 static void decode_mntname(char *name, int len) 718 { 719 int i, j = 0; 720 for (i = 0; i <= len; i++) { 721 if (name[i] != '\\') { 722 name[j++] = name[i]; 723 } else if (name[i + 1] == '\\') { 724 name[j++] = '\\'; 725 i++; 726 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' && 727 name[i + 2] >= '0' && name[i + 2] <= '7' && 728 name[i + 3] >= '0' && name[i + 3] <= '7') { 729 name[j++] = (name[i + 1] - '0') * 64 + 730 (name[i + 2] - '0') * 8 + 731 (name[i + 3] - '0'); 732 i += 3; 733 } else { 734 name[j++] = name[i]; 735 } 736 } 737 } 738 739 static void build_fs_mount_list(FsMountList *mounts, Error **errp) 740 { 741 FsMount *mount; 742 char const *mountinfo = "/proc/self/mountinfo"; 743 FILE *fp; 744 char *line = NULL, *dash; 745 size_t n; 746 char check; 747 unsigned int devmajor, devminor; 748 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e; 749 750 fp = fopen(mountinfo, "r"); 751 if (!fp) { 752 build_fs_mount_list_from_mtab(mounts, errp); 753 return; 754 } 755 756 while (getline(&line, &n, fp) != -1) { 757 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c", 758 &devmajor, &devminor, &dir_s, &dir_e, &check); 759 if (ret < 3) { 760 continue; 761 } 762 dash = strstr(line + dir_e, " - "); 763 if (!dash) { 764 continue; 765 } 766 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c", 767 &type_s, &type_e, &dev_s, &dev_e, &check); 768 if (ret < 1) { 769 continue; 770 } 771 line[dir_e] = 0; 772 dash[type_e] = 0; 773 dash[dev_e] = 0; 774 decode_mntname(line + dir_s, dir_e - dir_s); 775 decode_mntname(dash + dev_s, dev_e - dev_s); 776 if (devmajor == 0) { 777 /* btrfs reports major number = 0 */ 778 if (strcmp("btrfs", dash + type_s) != 0 || 779 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) { 780 continue; 781 } 782 } 783 784 mount = g_new0(FsMount, 1); 785 mount->dirname = g_strdup(line + dir_s); 786 mount->devtype = g_strdup(dash + type_s); 787 mount->devmajor = devmajor; 788 mount->devminor = devminor; 789 790 QTAILQ_INSERT_TAIL(mounts, mount, next); 791 } 792 free(line); 793 794 fclose(fp); 795 } 796 #endif 797 798 #if defined(CONFIG_FSFREEZE) 799 800 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp) 801 { 802 char *path; 803 char *dpath; 804 char *driver = NULL; 805 char buf[PATH_MAX]; 806 ssize_t len; 807 808 path = g_strndup(syspath, pathlen); 809 dpath = g_strdup_printf("%s/driver", path); 810 len = readlink(dpath, buf, sizeof(buf) - 1); 811 if (len != -1) { 812 buf[len] = 0; 813 driver = g_path_get_basename(buf); 814 } 815 g_free(dpath); 816 g_free(path); 817 return driver; 818 } 819 820 static int compare_uint(const void *_a, const void *_b) 821 { 822 unsigned int a = *(unsigned int *)_a; 823 unsigned int b = *(unsigned int *)_b; 824 825 return a < b ? -1 : a > b ? 1 : 0; 826 } 827 828 /* Walk the specified sysfs and build a sorted list of host or ata numbers */ 829 static int build_hosts(char const *syspath, char const *host, bool ata, 830 unsigned int *hosts, int hosts_max, Error **errp) 831 { 832 char *path; 833 DIR *dir; 834 struct dirent *entry; 835 int i = 0; 836 837 path = g_strndup(syspath, host - syspath); 838 dir = opendir(path); 839 if (!dir) { 840 error_setg_errno(errp, errno, "opendir(\"%s\")", path); 841 g_free(path); 842 return -1; 843 } 844 845 while (i < hosts_max) { 846 entry = readdir(dir); 847 if (!entry) { 848 break; 849 } 850 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) { 851 ++i; 852 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) { 853 ++i; 854 } 855 } 856 857 qsort(hosts, i, sizeof(hosts[0]), compare_uint); 858 859 g_free(path); 860 closedir(dir); 861 return i; 862 } 863 864 /* 865 * Store disk device info for devices on the PCI bus. 866 * Returns true if information has been stored, or false for failure. 867 */ 868 static bool build_guest_fsinfo_for_pci_dev(char const *syspath, 869 GuestDiskAddress *disk, 870 Error **errp) 871 { 872 unsigned int pci[4], host, hosts[8], tgt[3]; 873 int i, nhosts = 0, pcilen; 874 GuestPCIAddress *pciaddr = disk->pci_controller; 875 bool has_ata = false, has_host = false, has_tgt = false; 876 char *p, *q, *driver = NULL; 877 bool ret = false; 878 879 p = strstr(syspath, "/devices/pci"); 880 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", 881 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { 882 g_debug("only pci device is supported: sysfs path '%s'", syspath); 883 return false; 884 } 885 886 p += 12 + pcilen; 887 while (true) { 888 driver = get_pci_driver(syspath, p - syspath, errp); 889 if (driver && (g_str_equal(driver, "ata_piix") || 890 g_str_equal(driver, "sym53c8xx") || 891 g_str_equal(driver, "virtio-pci") || 892 g_str_equal(driver, "ahci"))) { 893 break; 894 } 895 896 g_free(driver); 897 if (sscanf(p, "/%x:%x:%x.%x%n", 898 pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) { 899 p += pcilen; 900 continue; 901 } 902 903 g_debug("unsupported driver or sysfs path '%s'", syspath); 904 return false; 905 } 906 907 p = strstr(syspath, "/target"); 908 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u", 909 tgt, tgt + 1, tgt + 2) == 3) { 910 has_tgt = true; 911 } 912 913 p = strstr(syspath, "/ata"); 914 if (p) { 915 q = p + 4; 916 has_ata = true; 917 } else { 918 p = strstr(syspath, "/host"); 919 q = p + 5; 920 } 921 if (p && sscanf(q, "%u", &host) == 1) { 922 has_host = true; 923 nhosts = build_hosts(syspath, p, has_ata, hosts, 924 ARRAY_SIZE(hosts), errp); 925 if (nhosts < 0) { 926 goto cleanup; 927 } 928 } 929 930 pciaddr->domain = pci[0]; 931 pciaddr->bus = pci[1]; 932 pciaddr->slot = pci[2]; 933 pciaddr->function = pci[3]; 934 935 if (strcmp(driver, "ata_piix") == 0) { 936 /* a host per ide bus, target*:0:<unit>:0 */ 937 if (!has_host || !has_tgt) { 938 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 939 goto cleanup; 940 } 941 for (i = 0; i < nhosts; i++) { 942 if (host == hosts[i]) { 943 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE; 944 disk->bus = i; 945 disk->unit = tgt[1]; 946 break; 947 } 948 } 949 if (i >= nhosts) { 950 g_debug("no host for '%s' (driver '%s')", syspath, driver); 951 goto cleanup; 952 } 953 } else if (strcmp(driver, "sym53c8xx") == 0) { 954 /* scsi(LSI Logic): target*:0:<unit>:0 */ 955 if (!has_tgt) { 956 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 957 goto cleanup; 958 } 959 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 960 disk->unit = tgt[1]; 961 } else if (strcmp(driver, "virtio-pci") == 0) { 962 if (has_tgt) { 963 /* virtio-scsi: target*:0:0:<unit> */ 964 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 965 disk->unit = tgt[2]; 966 } else { 967 /* virtio-blk: 1 disk per 1 device */ 968 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO; 969 } 970 } else if (strcmp(driver, "ahci") == 0) { 971 /* ahci: 1 host per 1 unit */ 972 if (!has_host || !has_tgt) { 973 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 974 goto cleanup; 975 } 976 for (i = 0; i < nhosts; i++) { 977 if (host == hosts[i]) { 978 disk->unit = i; 979 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA; 980 break; 981 } 982 } 983 if (i >= nhosts) { 984 g_debug("no host for '%s' (driver '%s')", syspath, driver); 985 goto cleanup; 986 } 987 } else { 988 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath); 989 goto cleanup; 990 } 991 992 ret = true; 993 994 cleanup: 995 g_free(driver); 996 return ret; 997 } 998 999 /* 1000 * Store disk device info for non-PCI virtio devices (for example s390x 1001 * channel I/O devices). Returns true if information has been stored, or 1002 * false for failure. 1003 */ 1004 static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath, 1005 GuestDiskAddress *disk, 1006 Error **errp) 1007 { 1008 unsigned int tgt[3]; 1009 char *p; 1010 1011 if (!strstr(syspath, "/virtio") || !strstr(syspath, "/block")) { 1012 g_debug("Unsupported virtio device '%s'", syspath); 1013 return false; 1014 } 1015 1016 p = strstr(syspath, "/target"); 1017 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u", 1018 &tgt[0], &tgt[1], &tgt[2]) == 3) { 1019 /* virtio-scsi: target*:0:<target>:<unit> */ 1020 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 1021 disk->bus = tgt[0]; 1022 disk->target = tgt[1]; 1023 disk->unit = tgt[2]; 1024 } else { 1025 /* virtio-blk: 1 disk per 1 device */ 1026 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO; 1027 } 1028 1029 return true; 1030 } 1031 1032 /* 1033 * Store disk device info for CCW devices (s390x channel I/O devices). 1034 * Returns true if information has been stored, or false for failure. 1035 */ 1036 static bool build_guest_fsinfo_for_ccw_dev(char const *syspath, 1037 GuestDiskAddress *disk, 1038 Error **errp) 1039 { 1040 unsigned int cssid, ssid, subchno, devno; 1041 char *p; 1042 1043 p = strstr(syspath, "/devices/css"); 1044 if (!p || sscanf(p + 12, "%*x/%x.%x.%x/%*x.%*x.%x/", 1045 &cssid, &ssid, &subchno, &devno) < 4) { 1046 g_debug("could not parse ccw device sysfs path: %s", syspath); 1047 return false; 1048 } 1049 1050 disk->has_ccw_address = true; 1051 disk->ccw_address = g_new0(GuestCCWAddress, 1); 1052 disk->ccw_address->cssid = cssid; 1053 disk->ccw_address->ssid = ssid; 1054 disk->ccw_address->subchno = subchno; 1055 disk->ccw_address->devno = devno; 1056 1057 if (strstr(p, "/virtio")) { 1058 build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1059 } 1060 1061 return true; 1062 } 1063 1064 /* Store disk device info specified by @sysfs into @fs */ 1065 static void build_guest_fsinfo_for_real_device(char const *syspath, 1066 GuestFilesystemInfo *fs, 1067 Error **errp) 1068 { 1069 GuestDiskAddress *disk; 1070 GuestPCIAddress *pciaddr; 1071 bool has_hwinf; 1072 #ifdef CONFIG_LIBUDEV 1073 struct udev *udev = NULL; 1074 struct udev_device *udevice = NULL; 1075 #endif 1076 1077 pciaddr = g_new0(GuestPCIAddress, 1); 1078 pciaddr->domain = -1; /* -1 means field is invalid */ 1079 pciaddr->bus = -1; 1080 pciaddr->slot = -1; 1081 pciaddr->function = -1; 1082 1083 disk = g_new0(GuestDiskAddress, 1); 1084 disk->pci_controller = pciaddr; 1085 disk->bus_type = GUEST_DISK_BUS_TYPE_UNKNOWN; 1086 1087 #ifdef CONFIG_LIBUDEV 1088 udev = udev_new(); 1089 udevice = udev_device_new_from_syspath(udev, syspath); 1090 if (udev == NULL || udevice == NULL) { 1091 g_debug("failed to query udev"); 1092 } else { 1093 const char *devnode, *serial; 1094 devnode = udev_device_get_devnode(udevice); 1095 if (devnode != NULL) { 1096 disk->dev = g_strdup(devnode); 1097 disk->has_dev = true; 1098 } 1099 serial = udev_device_get_property_value(udevice, "ID_SERIAL"); 1100 if (serial != NULL && *serial != 0) { 1101 disk->serial = g_strdup(serial); 1102 disk->has_serial = true; 1103 } 1104 } 1105 1106 udev_unref(udev); 1107 udev_device_unref(udevice); 1108 #endif 1109 1110 if (strstr(syspath, "/devices/pci")) { 1111 has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp); 1112 } else if (strstr(syspath, "/devices/css")) { 1113 has_hwinf = build_guest_fsinfo_for_ccw_dev(syspath, disk, errp); 1114 } else if (strstr(syspath, "/virtio")) { 1115 has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp); 1116 } else { 1117 g_debug("Unsupported device type for '%s'", syspath); 1118 has_hwinf = false; 1119 } 1120 1121 if (has_hwinf || disk->has_dev || disk->has_serial) { 1122 QAPI_LIST_PREPEND(fs->disk, disk); 1123 } else { 1124 qapi_free_GuestDiskAddress(disk); 1125 } 1126 } 1127 1128 static void build_guest_fsinfo_for_device(char const *devpath, 1129 GuestFilesystemInfo *fs, 1130 Error **errp); 1131 1132 /* Store a list of slave devices of virtual volume specified by @syspath into 1133 * @fs */ 1134 static void build_guest_fsinfo_for_virtual_device(char const *syspath, 1135 GuestFilesystemInfo *fs, 1136 Error **errp) 1137 { 1138 Error *err = NULL; 1139 DIR *dir; 1140 char *dirpath; 1141 struct dirent *entry; 1142 1143 dirpath = g_strdup_printf("%s/slaves", syspath); 1144 dir = opendir(dirpath); 1145 if (!dir) { 1146 if (errno != ENOENT) { 1147 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath); 1148 } 1149 g_free(dirpath); 1150 return; 1151 } 1152 1153 for (;;) { 1154 errno = 0; 1155 entry = readdir(dir); 1156 if (entry == NULL) { 1157 if (errno) { 1158 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath); 1159 } 1160 break; 1161 } 1162 1163 if (entry->d_type == DT_LNK) { 1164 char *path; 1165 1166 g_debug(" slave device '%s'", entry->d_name); 1167 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name); 1168 build_guest_fsinfo_for_device(path, fs, &err); 1169 g_free(path); 1170 1171 if (err) { 1172 error_propagate(errp, err); 1173 break; 1174 } 1175 } 1176 } 1177 1178 g_free(dirpath); 1179 closedir(dir); 1180 } 1181 1182 static bool is_disk_virtual(const char *devpath, Error **errp) 1183 { 1184 g_autofree char *syspath = realpath(devpath, NULL); 1185 1186 if (!syspath) { 1187 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1188 return false; 1189 } 1190 return strstr(syspath, "/devices/virtual/block/") != NULL; 1191 } 1192 1193 /* Dispatch to functions for virtual/real device */ 1194 static void build_guest_fsinfo_for_device(char const *devpath, 1195 GuestFilesystemInfo *fs, 1196 Error **errp) 1197 { 1198 ERRP_GUARD(); 1199 g_autofree char *syspath = NULL; 1200 bool is_virtual = false; 1201 1202 syspath = realpath(devpath, NULL); 1203 if (!syspath) { 1204 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1205 return; 1206 } 1207 1208 if (!fs->name) { 1209 fs->name = g_path_get_basename(syspath); 1210 } 1211 1212 g_debug(" parse sysfs path '%s'", syspath); 1213 is_virtual = is_disk_virtual(syspath, errp); 1214 if (*errp != NULL) { 1215 return; 1216 } 1217 if (is_virtual) { 1218 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1219 } else { 1220 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1221 } 1222 } 1223 1224 #ifdef CONFIG_LIBUDEV 1225 1226 /* 1227 * Wrapper around build_guest_fsinfo_for_device() for getting just 1228 * the disk address. 1229 */ 1230 static GuestDiskAddress *get_disk_address(const char *syspath, Error **errp) 1231 { 1232 g_autoptr(GuestFilesystemInfo) fs = NULL; 1233 1234 fs = g_new0(GuestFilesystemInfo, 1); 1235 build_guest_fsinfo_for_device(syspath, fs, errp); 1236 if (fs->disk != NULL) { 1237 return g_steal_pointer(&fs->disk->value); 1238 } 1239 return NULL; 1240 } 1241 1242 static char *get_alias_for_syspath(const char *syspath) 1243 { 1244 struct udev *udev = NULL; 1245 struct udev_device *udevice = NULL; 1246 char *ret = NULL; 1247 1248 udev = udev_new(); 1249 if (udev == NULL) { 1250 g_debug("failed to query udev"); 1251 goto out; 1252 } 1253 udevice = udev_device_new_from_syspath(udev, syspath); 1254 if (udevice == NULL) { 1255 g_debug("failed to query udev for path: %s", syspath); 1256 goto out; 1257 } else { 1258 const char *alias = udev_device_get_property_value( 1259 udevice, "DM_NAME"); 1260 /* 1261 * NULL means there was an error and empty string means there is no 1262 * alias. In case of no alias we return NULL instead of empty string. 1263 */ 1264 if (alias == NULL) { 1265 g_debug("failed to query udev for device alias for: %s", 1266 syspath); 1267 } else if (*alias != 0) { 1268 ret = g_strdup(alias); 1269 } 1270 } 1271 1272 out: 1273 udev_unref(udev); 1274 udev_device_unref(udevice); 1275 return ret; 1276 } 1277 1278 static char *get_device_for_syspath(const char *syspath) 1279 { 1280 struct udev *udev = NULL; 1281 struct udev_device *udevice = NULL; 1282 char *ret = NULL; 1283 1284 udev = udev_new(); 1285 if (udev == NULL) { 1286 g_debug("failed to query udev"); 1287 goto out; 1288 } 1289 udevice = udev_device_new_from_syspath(udev, syspath); 1290 if (udevice == NULL) { 1291 g_debug("failed to query udev for path: %s", syspath); 1292 goto out; 1293 } else { 1294 ret = g_strdup(udev_device_get_devnode(udevice)); 1295 } 1296 1297 out: 1298 udev_unref(udev); 1299 udev_device_unref(udevice); 1300 return ret; 1301 } 1302 1303 static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk) 1304 { 1305 g_autofree char *deps_dir = NULL; 1306 const gchar *dep; 1307 GDir *dp_deps = NULL; 1308 1309 /* List dependent disks */ 1310 deps_dir = g_strdup_printf("%s/slaves", disk_dir); 1311 g_debug(" listing entries in: %s", deps_dir); 1312 dp_deps = g_dir_open(deps_dir, 0, NULL); 1313 if (dp_deps == NULL) { 1314 g_debug("failed to list entries in %s", deps_dir); 1315 return; 1316 } 1317 disk->has_dependencies = true; 1318 while ((dep = g_dir_read_name(dp_deps)) != NULL) { 1319 g_autofree char *dep_dir = NULL; 1320 char *dev_name; 1321 1322 /* Add dependent disks */ 1323 dep_dir = g_strdup_printf("%s/%s", deps_dir, dep); 1324 dev_name = get_device_for_syspath(dep_dir); 1325 if (dev_name != NULL) { 1326 g_debug(" adding dependent device: %s", dev_name); 1327 QAPI_LIST_PREPEND(disk->dependencies, dev_name); 1328 } 1329 } 1330 g_dir_close(dp_deps); 1331 } 1332 1333 /* 1334 * Detect partitions subdirectory, name is "<disk_name><number>" or 1335 * "<disk_name>p<number>" 1336 * 1337 * @disk_name -- last component of /sys path (e.g. sda) 1338 * @disk_dir -- sys path of the disk (e.g. /sys/block/sda) 1339 * @disk_dev -- device node of the disk (e.g. /dev/sda) 1340 */ 1341 static GuestDiskInfoList *get_disk_partitions( 1342 GuestDiskInfoList *list, 1343 const char *disk_name, const char *disk_dir, 1344 const char *disk_dev) 1345 { 1346 GuestDiskInfoList *ret = list; 1347 struct dirent *de_disk; 1348 DIR *dp_disk = NULL; 1349 size_t len = strlen(disk_name); 1350 1351 dp_disk = opendir(disk_dir); 1352 while ((de_disk = readdir(dp_disk)) != NULL) { 1353 g_autofree char *partition_dir = NULL; 1354 char *dev_name; 1355 GuestDiskInfo *partition; 1356 1357 if (!(de_disk->d_type & DT_DIR)) { 1358 continue; 1359 } 1360 1361 if (!(strncmp(disk_name, de_disk->d_name, len) == 0 && 1362 ((*(de_disk->d_name + len) == 'p' && 1363 isdigit(*(de_disk->d_name + len + 1))) || 1364 isdigit(*(de_disk->d_name + len))))) { 1365 continue; 1366 } 1367 1368 partition_dir = g_strdup_printf("%s/%s", 1369 disk_dir, de_disk->d_name); 1370 dev_name = get_device_for_syspath(partition_dir); 1371 if (dev_name == NULL) { 1372 g_debug("Failed to get device name for syspath: %s", 1373 disk_dir); 1374 continue; 1375 } 1376 partition = g_new0(GuestDiskInfo, 1); 1377 partition->name = dev_name; 1378 partition->partition = true; 1379 /* Add parent disk as dependent for easier tracking of hierarchy */ 1380 QAPI_LIST_PREPEND(partition->dependencies, g_strdup(disk_dev)); 1381 1382 QAPI_LIST_PREPEND(ret, partition); 1383 } 1384 closedir(dp_disk); 1385 1386 return ret; 1387 } 1388 1389 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1390 { 1391 GuestDiskInfoList *ret = NULL; 1392 GuestDiskInfo *disk; 1393 DIR *dp = NULL; 1394 struct dirent *de = NULL; 1395 1396 g_debug("listing /sys/block directory"); 1397 dp = opendir("/sys/block"); 1398 if (dp == NULL) { 1399 error_setg_errno(errp, errno, "Can't open directory \"/sys/block\""); 1400 return NULL; 1401 } 1402 while ((de = readdir(dp)) != NULL) { 1403 g_autofree char *disk_dir = NULL, *line = NULL, 1404 *size_path = NULL; 1405 char *dev_name; 1406 Error *local_err = NULL; 1407 if (de->d_type != DT_LNK) { 1408 g_debug(" skipping entry: %s", de->d_name); 1409 continue; 1410 } 1411 1412 /* Check size and skip zero-sized disks */ 1413 g_debug(" checking disk size"); 1414 size_path = g_strdup_printf("/sys/block/%s/size", de->d_name); 1415 if (!g_file_get_contents(size_path, &line, NULL, NULL)) { 1416 g_debug(" failed to read disk size"); 1417 continue; 1418 } 1419 if (g_strcmp0(line, "0\n") == 0) { 1420 g_debug(" skipping zero-sized disk"); 1421 continue; 1422 } 1423 1424 g_debug(" adding %s", de->d_name); 1425 disk_dir = g_strdup_printf("/sys/block/%s", de->d_name); 1426 dev_name = get_device_for_syspath(disk_dir); 1427 if (dev_name == NULL) { 1428 g_debug("Failed to get device name for syspath: %s", 1429 disk_dir); 1430 continue; 1431 } 1432 disk = g_new0(GuestDiskInfo, 1); 1433 disk->name = dev_name; 1434 disk->partition = false; 1435 disk->alias = get_alias_for_syspath(disk_dir); 1436 disk->has_alias = (disk->alias != NULL); 1437 QAPI_LIST_PREPEND(ret, disk); 1438 1439 /* Get address for non-virtual devices */ 1440 bool is_virtual = is_disk_virtual(disk_dir, &local_err); 1441 if (local_err != NULL) { 1442 g_debug(" failed to check disk path, ignoring error: %s", 1443 error_get_pretty(local_err)); 1444 error_free(local_err); 1445 local_err = NULL; 1446 /* Don't try to get the address */ 1447 is_virtual = true; 1448 } 1449 if (!is_virtual) { 1450 disk->address = get_disk_address(disk_dir, &local_err); 1451 if (local_err != NULL) { 1452 g_debug(" failed to get device info, ignoring error: %s", 1453 error_get_pretty(local_err)); 1454 error_free(local_err); 1455 local_err = NULL; 1456 } else if (disk->address != NULL) { 1457 disk->has_address = true; 1458 } 1459 } 1460 1461 get_disk_deps(disk_dir, disk); 1462 ret = get_disk_partitions(ret, de->d_name, disk_dir, dev_name); 1463 } 1464 1465 closedir(dp); 1466 1467 return ret; 1468 } 1469 1470 #else 1471 1472 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 1473 { 1474 error_setg(errp, QERR_UNSUPPORTED); 1475 return NULL; 1476 } 1477 1478 #endif 1479 1480 /* Return a list of the disk device(s)' info which @mount lies on */ 1481 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1482 Error **errp) 1483 { 1484 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1485 struct statvfs buf; 1486 unsigned long used, nonroot_total, fr_size; 1487 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1488 mount->devmajor, mount->devminor); 1489 1490 fs->mountpoint = g_strdup(mount->dirname); 1491 fs->type = g_strdup(mount->devtype); 1492 build_guest_fsinfo_for_device(devpath, fs, errp); 1493 1494 if (statvfs(fs->mountpoint, &buf) == 0) { 1495 fr_size = buf.f_frsize; 1496 used = buf.f_blocks - buf.f_bfree; 1497 nonroot_total = used + buf.f_bavail; 1498 fs->used_bytes = used * fr_size; 1499 fs->total_bytes = nonroot_total * fr_size; 1500 1501 fs->has_total_bytes = true; 1502 fs->has_used_bytes = true; 1503 } 1504 1505 g_free(devpath); 1506 1507 return fs; 1508 } 1509 1510 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1511 { 1512 FsMountList mounts; 1513 struct FsMount *mount; 1514 GuestFilesystemInfoList *ret = NULL; 1515 Error *local_err = NULL; 1516 1517 QTAILQ_INIT(&mounts); 1518 build_fs_mount_list(&mounts, &local_err); 1519 if (local_err) { 1520 error_propagate(errp, local_err); 1521 return NULL; 1522 } 1523 1524 QTAILQ_FOREACH(mount, &mounts, next) { 1525 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1526 1527 QAPI_LIST_PREPEND(ret, build_guest_fsinfo(mount, &local_err)); 1528 if (local_err) { 1529 error_propagate(errp, local_err); 1530 qapi_free_GuestFilesystemInfoList(ret); 1531 ret = NULL; 1532 break; 1533 } 1534 } 1535 1536 free_fs_mount_list(&mounts); 1537 return ret; 1538 } 1539 1540 1541 typedef enum { 1542 FSFREEZE_HOOK_THAW = 0, 1543 FSFREEZE_HOOK_FREEZE, 1544 } FsfreezeHookArg; 1545 1546 static const char *fsfreeze_hook_arg_string[] = { 1547 "thaw", 1548 "freeze", 1549 }; 1550 1551 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1552 { 1553 int status; 1554 pid_t pid; 1555 const char *hook; 1556 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1557 Error *local_err = NULL; 1558 1559 hook = ga_fsfreeze_hook(ga_state); 1560 if (!hook) { 1561 return; 1562 } 1563 if (access(hook, X_OK) != 0) { 1564 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1565 return; 1566 } 1567 1568 slog("executing fsfreeze hook with arg '%s'", arg_str); 1569 pid = fork(); 1570 if (pid == 0) { 1571 setsid(); 1572 reopen_fd_to_null(0); 1573 reopen_fd_to_null(1); 1574 reopen_fd_to_null(2); 1575 1576 execle(hook, hook, arg_str, NULL, environ); 1577 _exit(EXIT_FAILURE); 1578 } else if (pid < 0) { 1579 error_setg_errno(errp, errno, "failed to create child process"); 1580 return; 1581 } 1582 1583 ga_wait_child(pid, &status, &local_err); 1584 if (local_err) { 1585 error_propagate(errp, local_err); 1586 return; 1587 } 1588 1589 if (!WIFEXITED(status)) { 1590 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1591 return; 1592 } 1593 1594 status = WEXITSTATUS(status); 1595 if (status) { 1596 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1597 return; 1598 } 1599 } 1600 1601 /* 1602 * Return status of freeze/thaw 1603 */ 1604 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1605 { 1606 if (ga_is_frozen(ga_state)) { 1607 return GUEST_FSFREEZE_STATUS_FROZEN; 1608 } 1609 1610 return GUEST_FSFREEZE_STATUS_THAWED; 1611 } 1612 1613 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1614 { 1615 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1616 } 1617 1618 /* 1619 * Walk list of mounted file systems in the guest, and freeze the ones which 1620 * are real local file systems. 1621 */ 1622 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1623 strList *mountpoints, 1624 Error **errp) 1625 { 1626 int ret = 0, i = 0; 1627 strList *list; 1628 FsMountList mounts; 1629 struct FsMount *mount; 1630 Error *local_err = NULL; 1631 int fd; 1632 1633 slog("guest-fsfreeze called"); 1634 1635 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1636 if (local_err) { 1637 error_propagate(errp, local_err); 1638 return -1; 1639 } 1640 1641 QTAILQ_INIT(&mounts); 1642 build_fs_mount_list(&mounts, &local_err); 1643 if (local_err) { 1644 error_propagate(errp, local_err); 1645 return -1; 1646 } 1647 1648 /* cannot risk guest agent blocking itself on a write in this state */ 1649 ga_set_frozen(ga_state); 1650 1651 QTAILQ_FOREACH_REVERSE(mount, &mounts, next) { 1652 /* To issue fsfreeze in the reverse order of mounts, check if the 1653 * mount is listed in the list here */ 1654 if (has_mountpoints) { 1655 for (list = mountpoints; list; list = list->next) { 1656 if (strcmp(list->value, mount->dirname) == 0) { 1657 break; 1658 } 1659 } 1660 if (!list) { 1661 continue; 1662 } 1663 } 1664 1665 fd = qemu_open_old(mount->dirname, O_RDONLY); 1666 if (fd == -1) { 1667 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1668 goto error; 1669 } 1670 1671 /* we try to cull filesystems we know won't work in advance, but other 1672 * filesystems may not implement fsfreeze for less obvious reasons. 1673 * these will report EOPNOTSUPP. we simply ignore these when tallying 1674 * the number of frozen filesystems. 1675 * if a filesystem is mounted more than once (aka bind mount) a 1676 * consecutive attempt to freeze an already frozen filesystem will 1677 * return EBUSY. 1678 * 1679 * any other error means a failure to freeze a filesystem we 1680 * expect to be freezable, so return an error in those cases 1681 * and return system to thawed state. 1682 */ 1683 ret = ioctl(fd, FIFREEZE); 1684 if (ret == -1) { 1685 if (errno != EOPNOTSUPP && errno != EBUSY) { 1686 error_setg_errno(errp, errno, "failed to freeze %s", 1687 mount->dirname); 1688 close(fd); 1689 goto error; 1690 } 1691 } else { 1692 i++; 1693 } 1694 close(fd); 1695 } 1696 1697 free_fs_mount_list(&mounts); 1698 /* We may not issue any FIFREEZE here. 1699 * Just unset ga_state here and ready for the next call. 1700 */ 1701 if (i == 0) { 1702 ga_unset_frozen(ga_state); 1703 } 1704 return i; 1705 1706 error: 1707 free_fs_mount_list(&mounts); 1708 qmp_guest_fsfreeze_thaw(NULL); 1709 return 0; 1710 } 1711 1712 /* 1713 * Walk list of frozen file systems in the guest, and thaw them. 1714 */ 1715 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1716 { 1717 int ret; 1718 FsMountList mounts; 1719 FsMount *mount; 1720 int fd, i = 0, logged; 1721 Error *local_err = NULL; 1722 1723 QTAILQ_INIT(&mounts); 1724 build_fs_mount_list(&mounts, &local_err); 1725 if (local_err) { 1726 error_propagate(errp, local_err); 1727 return 0; 1728 } 1729 1730 QTAILQ_FOREACH(mount, &mounts, next) { 1731 logged = false; 1732 fd = qemu_open_old(mount->dirname, O_RDONLY); 1733 if (fd == -1) { 1734 continue; 1735 } 1736 /* we have no way of knowing whether a filesystem was actually unfrozen 1737 * as a result of a successful call to FITHAW, only that if an error 1738 * was returned the filesystem was *not* unfrozen by that particular 1739 * call. 1740 * 1741 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1742 * to unfreeze, continuing issuing FITHAW until an error is returned, 1743 * in which case either the filesystem is in an unfreezable state, or, 1744 * more likely, it was thawed previously (and remains so afterward). 1745 * 1746 * also, since the most recent successful call is the one that did 1747 * the actual unfreeze, we can use this to provide an accurate count 1748 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1749 * may * be useful for determining whether a filesystem was unfrozen 1750 * during the freeze/thaw phase by a process other than qemu-ga. 1751 */ 1752 do { 1753 ret = ioctl(fd, FITHAW); 1754 if (ret == 0 && !logged) { 1755 i++; 1756 logged = true; 1757 } 1758 } while (ret == 0); 1759 close(fd); 1760 } 1761 1762 ga_unset_frozen(ga_state); 1763 free_fs_mount_list(&mounts); 1764 1765 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1766 1767 return i; 1768 } 1769 1770 static void guest_fsfreeze_cleanup(void) 1771 { 1772 Error *err = NULL; 1773 1774 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1775 qmp_guest_fsfreeze_thaw(&err); 1776 if (err) { 1777 slog("failed to clean up frozen filesystems: %s", 1778 error_get_pretty(err)); 1779 error_free(err); 1780 } 1781 } 1782 } 1783 #endif /* CONFIG_FSFREEZE */ 1784 1785 #if defined(CONFIG_FSTRIM) 1786 /* 1787 * Walk list of mounted file systems in the guest, and trim them. 1788 */ 1789 GuestFilesystemTrimResponse * 1790 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1791 { 1792 GuestFilesystemTrimResponse *response; 1793 GuestFilesystemTrimResult *result; 1794 int ret = 0; 1795 FsMountList mounts; 1796 struct FsMount *mount; 1797 int fd; 1798 Error *local_err = NULL; 1799 struct fstrim_range r; 1800 1801 slog("guest-fstrim called"); 1802 1803 QTAILQ_INIT(&mounts); 1804 build_fs_mount_list(&mounts, &local_err); 1805 if (local_err) { 1806 error_propagate(errp, local_err); 1807 return NULL; 1808 } 1809 1810 response = g_malloc0(sizeof(*response)); 1811 1812 QTAILQ_FOREACH(mount, &mounts, next) { 1813 result = g_malloc0(sizeof(*result)); 1814 result->path = g_strdup(mount->dirname); 1815 1816 QAPI_LIST_PREPEND(response->paths, result); 1817 1818 fd = qemu_open_old(mount->dirname, O_RDONLY); 1819 if (fd == -1) { 1820 result->error = g_strdup_printf("failed to open: %s", 1821 strerror(errno)); 1822 result->has_error = true; 1823 continue; 1824 } 1825 1826 /* We try to cull filesystems we know won't work in advance, but other 1827 * filesystems may not implement fstrim for less obvious reasons. 1828 * These will report EOPNOTSUPP; while in some other cases ENOTTY 1829 * will be reported (e.g. CD-ROMs). 1830 * Any other error means an unexpected error. 1831 */ 1832 r.start = 0; 1833 r.len = -1; 1834 r.minlen = has_minimum ? minimum : 0; 1835 ret = ioctl(fd, FITRIM, &r); 1836 if (ret == -1) { 1837 result->has_error = true; 1838 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1839 result->error = g_strdup("trim not supported"); 1840 } else { 1841 result->error = g_strdup_printf("failed to trim: %s", 1842 strerror(errno)); 1843 } 1844 close(fd); 1845 continue; 1846 } 1847 1848 result->has_minimum = true; 1849 result->minimum = r.minlen; 1850 result->has_trimmed = true; 1851 result->trimmed = r.len; 1852 close(fd); 1853 } 1854 1855 free_fs_mount_list(&mounts); 1856 return response; 1857 } 1858 #endif /* CONFIG_FSTRIM */ 1859 1860 1861 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1862 #define SUSPEND_SUPPORTED 0 1863 #define SUSPEND_NOT_SUPPORTED 1 1864 1865 typedef enum { 1866 SUSPEND_MODE_DISK = 0, 1867 SUSPEND_MODE_RAM = 1, 1868 SUSPEND_MODE_HYBRID = 2, 1869 } SuspendMode; 1870 1871 /* 1872 * Executes a command in a child process using g_spawn_sync, 1873 * returning an int >= 0 representing the exit status of the 1874 * process. 1875 * 1876 * If the program wasn't found in path, returns -1. 1877 * 1878 * If a problem happened when creating the child process, 1879 * returns -1 and errp is set. 1880 */ 1881 static int run_process_child(const char *command[], Error **errp) 1882 { 1883 int exit_status, spawn_flag; 1884 GError *g_err = NULL; 1885 bool success; 1886 1887 spawn_flag = G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | 1888 G_SPAWN_STDERR_TO_DEV_NULL; 1889 1890 success = g_spawn_sync(NULL, (char **)command, environ, spawn_flag, 1891 NULL, NULL, NULL, NULL, 1892 &exit_status, &g_err); 1893 1894 if (success) { 1895 return WEXITSTATUS(exit_status); 1896 } 1897 1898 if (g_err && (g_err->code != G_SPAWN_ERROR_NOENT)) { 1899 error_setg(errp, "failed to create child process, error '%s'", 1900 g_err->message); 1901 } 1902 1903 g_error_free(g_err); 1904 return -1; 1905 } 1906 1907 static bool systemd_supports_mode(SuspendMode mode, Error **errp) 1908 { 1909 const char *systemctl_args[3] = {"systemd-hibernate", "systemd-suspend", 1910 "systemd-hybrid-sleep"}; 1911 const char *cmd[4] = {"systemctl", "status", systemctl_args[mode], NULL}; 1912 int status; 1913 1914 status = run_process_child(cmd, errp); 1915 1916 /* 1917 * systemctl status uses LSB return codes so we can expect 1918 * status > 0 and be ok. To assert if the guest has support 1919 * for the selected suspend mode, status should be < 4. 4 is 1920 * the code for unknown service status, the return value when 1921 * the service does not exist. A common value is status = 3 1922 * (program is not running). 1923 */ 1924 if (status > 0 && status < 4) { 1925 return true; 1926 } 1927 1928 return false; 1929 } 1930 1931 static void systemd_suspend(SuspendMode mode, Error **errp) 1932 { 1933 Error *local_err = NULL; 1934 const char *systemctl_args[3] = {"hibernate", "suspend", "hybrid-sleep"}; 1935 const char *cmd[3] = {"systemctl", systemctl_args[mode], NULL}; 1936 int status; 1937 1938 status = run_process_child(cmd, &local_err); 1939 1940 if (status == 0) { 1941 return; 1942 } 1943 1944 if ((status == -1) && !local_err) { 1945 error_setg(errp, "the helper program 'systemctl %s' was not found", 1946 systemctl_args[mode]); 1947 return; 1948 } 1949 1950 if (local_err) { 1951 error_propagate(errp, local_err); 1952 } else { 1953 error_setg(errp, "the helper program 'systemctl %s' returned an " 1954 "unexpected exit status code (%d)", 1955 systemctl_args[mode], status); 1956 } 1957 } 1958 1959 static bool pmutils_supports_mode(SuspendMode mode, Error **errp) 1960 { 1961 Error *local_err = NULL; 1962 const char *pmutils_args[3] = {"--hibernate", "--suspend", 1963 "--suspend-hybrid"}; 1964 const char *cmd[3] = {"pm-is-supported", pmutils_args[mode], NULL}; 1965 int status; 1966 1967 status = run_process_child(cmd, &local_err); 1968 1969 if (status == SUSPEND_SUPPORTED) { 1970 return true; 1971 } 1972 1973 if ((status == -1) && !local_err) { 1974 return false; 1975 } 1976 1977 if (local_err) { 1978 error_propagate(errp, local_err); 1979 } else { 1980 error_setg(errp, 1981 "the helper program '%s' returned an unexpected exit" 1982 " status code (%d)", "pm-is-supported", status); 1983 } 1984 1985 return false; 1986 } 1987 1988 static void pmutils_suspend(SuspendMode mode, Error **errp) 1989 { 1990 Error *local_err = NULL; 1991 const char *pmutils_binaries[3] = {"pm-hibernate", "pm-suspend", 1992 "pm-suspend-hybrid"}; 1993 const char *cmd[2] = {pmutils_binaries[mode], NULL}; 1994 int status; 1995 1996 status = run_process_child(cmd, &local_err); 1997 1998 if (status == 0) { 1999 return; 2000 } 2001 2002 if ((status == -1) && !local_err) { 2003 error_setg(errp, "the helper program '%s' was not found", 2004 pmutils_binaries[mode]); 2005 return; 2006 } 2007 2008 if (local_err) { 2009 error_propagate(errp, local_err); 2010 } else { 2011 error_setg(errp, 2012 "the helper program '%s' returned an unexpected exit" 2013 " status code (%d)", pmutils_binaries[mode], status); 2014 } 2015 } 2016 2017 static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) 2018 { 2019 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2020 const char *sysfile_str = sysfile_strs[mode]; 2021 char buf[32]; /* hopefully big enough */ 2022 int fd; 2023 ssize_t ret; 2024 2025 if (!sysfile_str) { 2026 error_setg(errp, "unknown guest suspend mode"); 2027 return false; 2028 } 2029 2030 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 2031 if (fd < 0) { 2032 return false; 2033 } 2034 2035 ret = read(fd, buf, sizeof(buf) - 1); 2036 close(fd); 2037 if (ret <= 0) { 2038 return false; 2039 } 2040 buf[ret] = '\0'; 2041 2042 if (strstr(buf, sysfile_str)) { 2043 return true; 2044 } 2045 return false; 2046 } 2047 2048 static void linux_sys_state_suspend(SuspendMode mode, Error **errp) 2049 { 2050 Error *local_err = NULL; 2051 const char *sysfile_strs[3] = {"disk", "mem", NULL}; 2052 const char *sysfile_str = sysfile_strs[mode]; 2053 pid_t pid; 2054 int status; 2055 2056 if (!sysfile_str) { 2057 error_setg(errp, "unknown guest suspend mode"); 2058 return; 2059 } 2060 2061 pid = fork(); 2062 if (!pid) { 2063 /* child */ 2064 int fd; 2065 2066 setsid(); 2067 reopen_fd_to_null(0); 2068 reopen_fd_to_null(1); 2069 reopen_fd_to_null(2); 2070 2071 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 2072 if (fd < 0) { 2073 _exit(EXIT_FAILURE); 2074 } 2075 2076 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 2077 _exit(EXIT_FAILURE); 2078 } 2079 2080 _exit(EXIT_SUCCESS); 2081 } else if (pid < 0) { 2082 error_setg_errno(errp, errno, "failed to create child process"); 2083 return; 2084 } 2085 2086 ga_wait_child(pid, &status, &local_err); 2087 if (local_err) { 2088 error_propagate(errp, local_err); 2089 return; 2090 } 2091 2092 if (WEXITSTATUS(status)) { 2093 error_setg(errp, "child process has failed to suspend"); 2094 } 2095 2096 } 2097 2098 static void guest_suspend(SuspendMode mode, Error **errp) 2099 { 2100 Error *local_err = NULL; 2101 bool mode_supported = false; 2102 2103 if (systemd_supports_mode(mode, &local_err)) { 2104 mode_supported = true; 2105 systemd_suspend(mode, &local_err); 2106 } 2107 2108 if (!local_err) { 2109 return; 2110 } 2111 2112 error_free(local_err); 2113 local_err = NULL; 2114 2115 if (pmutils_supports_mode(mode, &local_err)) { 2116 mode_supported = true; 2117 pmutils_suspend(mode, &local_err); 2118 } 2119 2120 if (!local_err) { 2121 return; 2122 } 2123 2124 error_free(local_err); 2125 local_err = NULL; 2126 2127 if (linux_sys_state_supports_mode(mode, &local_err)) { 2128 mode_supported = true; 2129 linux_sys_state_suspend(mode, &local_err); 2130 } 2131 2132 if (!mode_supported) { 2133 error_free(local_err); 2134 error_setg(errp, 2135 "the requested suspend mode is not supported by the guest"); 2136 } else { 2137 error_propagate(errp, local_err); 2138 } 2139 } 2140 2141 void qmp_guest_suspend_disk(Error **errp) 2142 { 2143 guest_suspend(SUSPEND_MODE_DISK, errp); 2144 } 2145 2146 void qmp_guest_suspend_ram(Error **errp) 2147 { 2148 guest_suspend(SUSPEND_MODE_RAM, errp); 2149 } 2150 2151 void qmp_guest_suspend_hybrid(Error **errp) 2152 { 2153 guest_suspend(SUSPEND_MODE_HYBRID, errp); 2154 } 2155 2156 static GuestNetworkInterfaceList * 2157 guest_find_interface(GuestNetworkInterfaceList *head, 2158 const char *name) 2159 { 2160 for (; head; head = head->next) { 2161 if (strcmp(head->value->name, name) == 0) { 2162 break; 2163 } 2164 } 2165 2166 return head; 2167 } 2168 2169 static int guest_get_network_stats(const char *name, 2170 GuestNetworkInterfaceStat *stats) 2171 { 2172 int name_len; 2173 char const *devinfo = "/proc/net/dev"; 2174 FILE *fp; 2175 char *line = NULL, *colon; 2176 size_t n = 0; 2177 fp = fopen(devinfo, "r"); 2178 if (!fp) { 2179 return -1; 2180 } 2181 name_len = strlen(name); 2182 while (getline(&line, &n, fp) != -1) { 2183 long long dummy; 2184 long long rx_bytes; 2185 long long rx_packets; 2186 long long rx_errs; 2187 long long rx_dropped; 2188 long long tx_bytes; 2189 long long tx_packets; 2190 long long tx_errs; 2191 long long tx_dropped; 2192 char *trim_line; 2193 trim_line = g_strchug(line); 2194 if (trim_line[0] == '\0') { 2195 continue; 2196 } 2197 colon = strchr(trim_line, ':'); 2198 if (!colon) { 2199 continue; 2200 } 2201 if (colon - name_len == trim_line && 2202 strncmp(trim_line, name, name_len) == 0) { 2203 if (sscanf(colon + 1, 2204 "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld", 2205 &rx_bytes, &rx_packets, &rx_errs, &rx_dropped, 2206 &dummy, &dummy, &dummy, &dummy, 2207 &tx_bytes, &tx_packets, &tx_errs, &tx_dropped, 2208 &dummy, &dummy, &dummy, &dummy) != 16) { 2209 continue; 2210 } 2211 stats->rx_bytes = rx_bytes; 2212 stats->rx_packets = rx_packets; 2213 stats->rx_errs = rx_errs; 2214 stats->rx_dropped = rx_dropped; 2215 stats->tx_bytes = tx_bytes; 2216 stats->tx_packets = tx_packets; 2217 stats->tx_errs = tx_errs; 2218 stats->tx_dropped = tx_dropped; 2219 fclose(fp); 2220 g_free(line); 2221 return 0; 2222 } 2223 } 2224 fclose(fp); 2225 g_free(line); 2226 g_debug("/proc/net/dev: Interface '%s' not found", name); 2227 return -1; 2228 } 2229 2230 /* 2231 * Build information about guest interfaces 2232 */ 2233 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2234 { 2235 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 2236 struct ifaddrs *ifap, *ifa; 2237 2238 if (getifaddrs(&ifap) < 0) { 2239 error_setg_errno(errp, errno, "getifaddrs failed"); 2240 goto error; 2241 } 2242 2243 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2244 GuestNetworkInterfaceList *info; 2245 GuestIpAddressList **address_list = NULL, *address_item = NULL; 2246 GuestNetworkInterfaceStat *interface_stat = NULL; 2247 char addr4[INET_ADDRSTRLEN]; 2248 char addr6[INET6_ADDRSTRLEN]; 2249 int sock; 2250 struct ifreq ifr; 2251 unsigned char *mac_addr; 2252 void *p; 2253 2254 g_debug("Processing %s interface", ifa->ifa_name); 2255 2256 info = guest_find_interface(head, ifa->ifa_name); 2257 2258 if (!info) { 2259 info = g_malloc0(sizeof(*info)); 2260 info->value = g_malloc0(sizeof(*info->value)); 2261 info->value->name = g_strdup(ifa->ifa_name); 2262 2263 if (!cur_item) { 2264 head = cur_item = info; 2265 } else { 2266 cur_item->next = info; 2267 cur_item = info; 2268 } 2269 } 2270 2271 if (!info->value->has_hardware_address && 2272 ifa->ifa_flags & SIOCGIFHWADDR) { 2273 /* we haven't obtained HW address yet */ 2274 sock = socket(PF_INET, SOCK_STREAM, 0); 2275 if (sock == -1) { 2276 error_setg_errno(errp, errno, "failed to create socket"); 2277 goto error; 2278 } 2279 2280 memset(&ifr, 0, sizeof(ifr)); 2281 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 2282 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 2283 error_setg_errno(errp, errno, 2284 "failed to get MAC address of %s", 2285 ifa->ifa_name); 2286 close(sock); 2287 goto error; 2288 } 2289 2290 close(sock); 2291 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 2292 2293 info->value->hardware_address = 2294 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 2295 (int) mac_addr[0], (int) mac_addr[1], 2296 (int) mac_addr[2], (int) mac_addr[3], 2297 (int) mac_addr[4], (int) mac_addr[5]); 2298 2299 info->value->has_hardware_address = true; 2300 } 2301 2302 if (ifa->ifa_addr && 2303 ifa->ifa_addr->sa_family == AF_INET) { 2304 /* interface with IPv4 address */ 2305 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 2306 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 2307 error_setg_errno(errp, errno, "inet_ntop failed"); 2308 goto error; 2309 } 2310 2311 address_item = g_malloc0(sizeof(*address_item)); 2312 address_item->value = g_malloc0(sizeof(*address_item->value)); 2313 address_item->value->ip_address = g_strdup(addr4); 2314 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 2315 2316 if (ifa->ifa_netmask) { 2317 /* Count the number of set bits in netmask. 2318 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2319 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 2320 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 2321 } 2322 } else if (ifa->ifa_addr && 2323 ifa->ifa_addr->sa_family == AF_INET6) { 2324 /* interface with IPv6 address */ 2325 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 2326 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 2327 error_setg_errno(errp, errno, "inet_ntop failed"); 2328 goto error; 2329 } 2330 2331 address_item = g_malloc0(sizeof(*address_item)); 2332 address_item->value = g_malloc0(sizeof(*address_item->value)); 2333 address_item->value->ip_address = g_strdup(addr6); 2334 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 2335 2336 if (ifa->ifa_netmask) { 2337 /* Count the number of set bits in netmask. 2338 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 2339 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 2340 address_item->value->prefix = 2341 ctpop32(((uint32_t *) p)[0]) + 2342 ctpop32(((uint32_t *) p)[1]) + 2343 ctpop32(((uint32_t *) p)[2]) + 2344 ctpop32(((uint32_t *) p)[3]); 2345 } 2346 } 2347 2348 if (!address_item) { 2349 continue; 2350 } 2351 2352 address_list = &info->value->ip_addresses; 2353 2354 while (*address_list && (*address_list)->next) { 2355 address_list = &(*address_list)->next; 2356 } 2357 2358 if (!*address_list) { 2359 *address_list = address_item; 2360 } else { 2361 (*address_list)->next = address_item; 2362 } 2363 2364 info->value->has_ip_addresses = true; 2365 2366 if (!info->value->has_statistics) { 2367 interface_stat = g_malloc0(sizeof(*interface_stat)); 2368 if (guest_get_network_stats(info->value->name, 2369 interface_stat) == -1) { 2370 info->value->has_statistics = false; 2371 g_free(interface_stat); 2372 } else { 2373 info->value->statistics = interface_stat; 2374 info->value->has_statistics = true; 2375 } 2376 } 2377 } 2378 2379 freeifaddrs(ifap); 2380 return head; 2381 2382 error: 2383 freeifaddrs(ifap); 2384 qapi_free_GuestNetworkInterfaceList(head); 2385 return NULL; 2386 } 2387 2388 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 2389 2390 static long sysconf_exact(int name, const char *name_str, Error **errp) 2391 { 2392 long ret; 2393 2394 errno = 0; 2395 ret = sysconf(name); 2396 if (ret == -1) { 2397 if (errno == 0) { 2398 error_setg(errp, "sysconf(%s): value indefinite", name_str); 2399 } else { 2400 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 2401 } 2402 } 2403 return ret; 2404 } 2405 2406 /* Transfer online/offline status between @vcpu and the guest system. 2407 * 2408 * On input either @errp or *@errp must be NULL. 2409 * 2410 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 2411 * - R: vcpu->logical_id 2412 * - W: vcpu->online 2413 * - W: vcpu->can_offline 2414 * 2415 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 2416 * - R: vcpu->logical_id 2417 * - R: vcpu->online 2418 * 2419 * Written members remain unmodified on error. 2420 */ 2421 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 2422 char *dirpath, Error **errp) 2423 { 2424 int fd; 2425 int res; 2426 int dirfd; 2427 static const char fn[] = "online"; 2428 2429 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2430 if (dirfd == -1) { 2431 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2432 return; 2433 } 2434 2435 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 2436 if (fd == -1) { 2437 if (errno != ENOENT) { 2438 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 2439 } else if (sys2vcpu) { 2440 vcpu->online = true; 2441 vcpu->can_offline = false; 2442 } else if (!vcpu->online) { 2443 error_setg(errp, "logical processor #%" PRId64 " can't be " 2444 "offlined", vcpu->logical_id); 2445 } /* otherwise pretend successful re-onlining */ 2446 } else { 2447 unsigned char status; 2448 2449 res = pread(fd, &status, 1, 0); 2450 if (res == -1) { 2451 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 2452 } else if (res == 0) { 2453 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 2454 fn); 2455 } else if (sys2vcpu) { 2456 vcpu->online = (status != '0'); 2457 vcpu->can_offline = true; 2458 } else if (vcpu->online != (status != '0')) { 2459 status = '0' + vcpu->online; 2460 if (pwrite(fd, &status, 1, 0) == -1) { 2461 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 2462 fn); 2463 } 2464 } /* otherwise pretend successful re-(on|off)-lining */ 2465 2466 res = close(fd); 2467 g_assert(res == 0); 2468 } 2469 2470 res = close(dirfd); 2471 g_assert(res == 0); 2472 } 2473 2474 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2475 { 2476 int64_t current; 2477 GuestLogicalProcessorList *head, **link; 2478 long sc_max; 2479 Error *local_err = NULL; 2480 2481 current = 0; 2482 head = NULL; 2483 link = &head; 2484 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 2485 2486 while (local_err == NULL && current < sc_max) { 2487 GuestLogicalProcessor *vcpu; 2488 GuestLogicalProcessorList *entry; 2489 int64_t id = current++; 2490 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2491 id); 2492 2493 if (g_file_test(path, G_FILE_TEST_EXISTS)) { 2494 vcpu = g_malloc0(sizeof *vcpu); 2495 vcpu->logical_id = id; 2496 vcpu->has_can_offline = true; /* lolspeak ftw */ 2497 transfer_vcpu(vcpu, true, path, &local_err); 2498 entry = g_malloc0(sizeof *entry); 2499 entry->value = vcpu; 2500 *link = entry; 2501 link = &entry->next; 2502 } 2503 g_free(path); 2504 } 2505 2506 if (local_err == NULL) { 2507 /* there's no guest with zero VCPUs */ 2508 g_assert(head != NULL); 2509 return head; 2510 } 2511 2512 qapi_free_GuestLogicalProcessorList(head); 2513 error_propagate(errp, local_err); 2514 return NULL; 2515 } 2516 2517 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2518 { 2519 int64_t processed; 2520 Error *local_err = NULL; 2521 2522 processed = 0; 2523 while (vcpus != NULL) { 2524 char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 2525 vcpus->value->logical_id); 2526 2527 transfer_vcpu(vcpus->value, false, path, &local_err); 2528 g_free(path); 2529 if (local_err != NULL) { 2530 break; 2531 } 2532 ++processed; 2533 vcpus = vcpus->next; 2534 } 2535 2536 if (local_err != NULL) { 2537 if (processed == 0) { 2538 error_propagate(errp, local_err); 2539 } else { 2540 error_free(local_err); 2541 } 2542 } 2543 2544 return processed; 2545 } 2546 2547 void qmp_guest_set_user_password(const char *username, 2548 const char *password, 2549 bool crypted, 2550 Error **errp) 2551 { 2552 Error *local_err = NULL; 2553 char *passwd_path = NULL; 2554 pid_t pid; 2555 int status; 2556 int datafd[2] = { -1, -1 }; 2557 char *rawpasswddata = NULL; 2558 size_t rawpasswdlen; 2559 char *chpasswddata = NULL; 2560 size_t chpasswdlen; 2561 2562 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 2563 if (!rawpasswddata) { 2564 return; 2565 } 2566 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 2567 rawpasswddata[rawpasswdlen] = '\0'; 2568 2569 if (strchr(rawpasswddata, '\n')) { 2570 error_setg(errp, "forbidden characters in raw password"); 2571 goto out; 2572 } 2573 2574 if (strchr(username, '\n') || 2575 strchr(username, ':')) { 2576 error_setg(errp, "forbidden characters in username"); 2577 goto out; 2578 } 2579 2580 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 2581 chpasswdlen = strlen(chpasswddata); 2582 2583 passwd_path = g_find_program_in_path("chpasswd"); 2584 2585 if (!passwd_path) { 2586 error_setg(errp, "cannot find 'passwd' program in PATH"); 2587 goto out; 2588 } 2589 2590 if (pipe(datafd) < 0) { 2591 error_setg(errp, "cannot create pipe FDs"); 2592 goto out; 2593 } 2594 2595 pid = fork(); 2596 if (pid == 0) { 2597 close(datafd[1]); 2598 /* child */ 2599 setsid(); 2600 dup2(datafd[0], 0); 2601 reopen_fd_to_null(1); 2602 reopen_fd_to_null(2); 2603 2604 if (crypted) { 2605 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2606 } else { 2607 execle(passwd_path, "chpasswd", NULL, environ); 2608 } 2609 _exit(EXIT_FAILURE); 2610 } else if (pid < 0) { 2611 error_setg_errno(errp, errno, "failed to create child process"); 2612 goto out; 2613 } 2614 close(datafd[0]); 2615 datafd[0] = -1; 2616 2617 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2618 error_setg_errno(errp, errno, "cannot write new account password"); 2619 goto out; 2620 } 2621 close(datafd[1]); 2622 datafd[1] = -1; 2623 2624 ga_wait_child(pid, &status, &local_err); 2625 if (local_err) { 2626 error_propagate(errp, local_err); 2627 goto out; 2628 } 2629 2630 if (!WIFEXITED(status)) { 2631 error_setg(errp, "child process has terminated abnormally"); 2632 goto out; 2633 } 2634 2635 if (WEXITSTATUS(status)) { 2636 error_setg(errp, "child process has failed to set user password"); 2637 goto out; 2638 } 2639 2640 out: 2641 g_free(chpasswddata); 2642 g_free(rawpasswddata); 2643 g_free(passwd_path); 2644 if (datafd[0] != -1) { 2645 close(datafd[0]); 2646 } 2647 if (datafd[1] != -1) { 2648 close(datafd[1]); 2649 } 2650 } 2651 2652 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2653 int size, Error **errp) 2654 { 2655 int fd; 2656 int res; 2657 2658 errno = 0; 2659 fd = openat(dirfd, pathname, O_RDONLY); 2660 if (fd == -1) { 2661 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2662 return; 2663 } 2664 2665 res = pread(fd, buf, size, 0); 2666 if (res == -1) { 2667 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2668 } else if (res == 0) { 2669 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2670 } 2671 close(fd); 2672 } 2673 2674 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2675 const char *buf, int size, Error **errp) 2676 { 2677 int fd; 2678 2679 errno = 0; 2680 fd = openat(dirfd, pathname, O_WRONLY); 2681 if (fd == -1) { 2682 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2683 return; 2684 } 2685 2686 if (pwrite(fd, buf, size, 0) == -1) { 2687 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2688 } 2689 2690 close(fd); 2691 } 2692 2693 /* Transfer online/offline status between @mem_blk and the guest system. 2694 * 2695 * On input either @errp or *@errp must be NULL. 2696 * 2697 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2698 * - R: mem_blk->phys_index 2699 * - W: mem_blk->online 2700 * - W: mem_blk->can_offline 2701 * 2702 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2703 * - R: mem_blk->phys_index 2704 * - R: mem_blk->online 2705 *- R: mem_blk->can_offline 2706 * Written members remain unmodified on error. 2707 */ 2708 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2709 GuestMemoryBlockResponse *result, 2710 Error **errp) 2711 { 2712 char *dirpath; 2713 int dirfd; 2714 char *status; 2715 Error *local_err = NULL; 2716 2717 if (!sys2memblk) { 2718 DIR *dp; 2719 2720 if (!result) { 2721 error_setg(errp, "Internal error, 'result' should not be NULL"); 2722 return; 2723 } 2724 errno = 0; 2725 dp = opendir("/sys/devices/system/memory/"); 2726 /* if there is no 'memory' directory in sysfs, 2727 * we think this VM does not support online/offline memory block, 2728 * any other solution? 2729 */ 2730 if (!dp) { 2731 if (errno == ENOENT) { 2732 result->response = 2733 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2734 } 2735 goto out1; 2736 } 2737 closedir(dp); 2738 } 2739 2740 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2741 mem_blk->phys_index); 2742 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2743 if (dirfd == -1) { 2744 if (sys2memblk) { 2745 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2746 } else { 2747 if (errno == ENOENT) { 2748 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2749 } else { 2750 result->response = 2751 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2752 } 2753 } 2754 g_free(dirpath); 2755 goto out1; 2756 } 2757 g_free(dirpath); 2758 2759 status = g_malloc0(10); 2760 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2761 if (local_err) { 2762 /* treat with sysfs file that not exist in old kernel */ 2763 if (errno == ENOENT) { 2764 error_free(local_err); 2765 if (sys2memblk) { 2766 mem_blk->online = true; 2767 mem_blk->can_offline = false; 2768 } else if (!mem_blk->online) { 2769 result->response = 2770 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2771 } 2772 } else { 2773 if (sys2memblk) { 2774 error_propagate(errp, local_err); 2775 } else { 2776 error_free(local_err); 2777 result->response = 2778 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2779 } 2780 } 2781 goto out2; 2782 } 2783 2784 if (sys2memblk) { 2785 char removable = '0'; 2786 2787 mem_blk->online = (strncmp(status, "online", 6) == 0); 2788 2789 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2790 if (local_err) { 2791 /* if no 'removable' file, it doesn't support offline mem blk */ 2792 if (errno == ENOENT) { 2793 error_free(local_err); 2794 mem_blk->can_offline = false; 2795 } else { 2796 error_propagate(errp, local_err); 2797 } 2798 } else { 2799 mem_blk->can_offline = (removable != '0'); 2800 } 2801 } else { 2802 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2803 const char *new_state = mem_blk->online ? "online" : "offline"; 2804 2805 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2806 &local_err); 2807 if (local_err) { 2808 error_free(local_err); 2809 result->response = 2810 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2811 goto out2; 2812 } 2813 2814 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2815 result->has_error_code = false; 2816 } /* otherwise pretend successful re-(on|off)-lining */ 2817 } 2818 g_free(status); 2819 close(dirfd); 2820 return; 2821 2822 out2: 2823 g_free(status); 2824 close(dirfd); 2825 out1: 2826 if (!sys2memblk) { 2827 result->has_error_code = true; 2828 result->error_code = errno; 2829 } 2830 } 2831 2832 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2833 { 2834 GuestMemoryBlockList *head, **link; 2835 Error *local_err = NULL; 2836 struct dirent *de; 2837 DIR *dp; 2838 2839 head = NULL; 2840 link = &head; 2841 2842 dp = opendir("/sys/devices/system/memory/"); 2843 if (!dp) { 2844 /* it's ok if this happens to be a system that doesn't expose 2845 * memory blocks via sysfs, but otherwise we should report 2846 * an error 2847 */ 2848 if (errno != ENOENT) { 2849 error_setg_errno(errp, errno, "Can't open directory" 2850 "\"/sys/devices/system/memory/\""); 2851 } 2852 return NULL; 2853 } 2854 2855 /* Note: the phys_index of memory block may be discontinuous, 2856 * this is because a memblk is the unit of the Sparse Memory design, which 2857 * allows discontinuous memory ranges (ex. NUMA), so here we should 2858 * traverse the memory block directory. 2859 */ 2860 while ((de = readdir(dp)) != NULL) { 2861 GuestMemoryBlock *mem_blk; 2862 GuestMemoryBlockList *entry; 2863 2864 if ((strncmp(de->d_name, "memory", 6) != 0) || 2865 !(de->d_type & DT_DIR)) { 2866 continue; 2867 } 2868 2869 mem_blk = g_malloc0(sizeof *mem_blk); 2870 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2871 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2872 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2873 transfer_memory_block(mem_blk, true, NULL, &local_err); 2874 if (local_err) { 2875 break; 2876 } 2877 2878 entry = g_malloc0(sizeof *entry); 2879 entry->value = mem_blk; 2880 2881 *link = entry; 2882 link = &entry->next; 2883 } 2884 2885 closedir(dp); 2886 if (local_err == NULL) { 2887 /* there's no guest with zero memory blocks */ 2888 if (head == NULL) { 2889 error_setg(errp, "guest reported zero memory blocks!"); 2890 } 2891 return head; 2892 } 2893 2894 qapi_free_GuestMemoryBlockList(head); 2895 error_propagate(errp, local_err); 2896 return NULL; 2897 } 2898 2899 GuestMemoryBlockResponseList * 2900 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2901 { 2902 GuestMemoryBlockResponseList *head, **link; 2903 Error *local_err = NULL; 2904 2905 head = NULL; 2906 link = &head; 2907 2908 while (mem_blks != NULL) { 2909 GuestMemoryBlockResponse *result; 2910 GuestMemoryBlockResponseList *entry; 2911 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2912 2913 result = g_malloc0(sizeof(*result)); 2914 result->phys_index = current_mem_blk->phys_index; 2915 transfer_memory_block(current_mem_blk, false, result, &local_err); 2916 if (local_err) { /* should never happen */ 2917 goto err; 2918 } 2919 entry = g_malloc0(sizeof *entry); 2920 entry->value = result; 2921 2922 *link = entry; 2923 link = &entry->next; 2924 mem_blks = mem_blks->next; 2925 } 2926 2927 return head; 2928 err: 2929 qapi_free_GuestMemoryBlockResponseList(head); 2930 error_propagate(errp, local_err); 2931 return NULL; 2932 } 2933 2934 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2935 { 2936 Error *local_err = NULL; 2937 char *dirpath; 2938 int dirfd; 2939 char *buf; 2940 GuestMemoryBlockInfo *info; 2941 2942 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2943 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2944 if (dirfd == -1) { 2945 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2946 g_free(dirpath); 2947 return NULL; 2948 } 2949 g_free(dirpath); 2950 2951 buf = g_malloc0(20); 2952 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2953 close(dirfd); 2954 if (local_err) { 2955 g_free(buf); 2956 error_propagate(errp, local_err); 2957 return NULL; 2958 } 2959 2960 info = g_new0(GuestMemoryBlockInfo, 1); 2961 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2962 2963 g_free(buf); 2964 2965 return info; 2966 } 2967 2968 #else /* defined(__linux__) */ 2969 2970 void qmp_guest_suspend_disk(Error **errp) 2971 { 2972 error_setg(errp, QERR_UNSUPPORTED); 2973 } 2974 2975 void qmp_guest_suspend_ram(Error **errp) 2976 { 2977 error_setg(errp, QERR_UNSUPPORTED); 2978 } 2979 2980 void qmp_guest_suspend_hybrid(Error **errp) 2981 { 2982 error_setg(errp, QERR_UNSUPPORTED); 2983 } 2984 2985 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2986 { 2987 error_setg(errp, QERR_UNSUPPORTED); 2988 return NULL; 2989 } 2990 2991 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2992 { 2993 error_setg(errp, QERR_UNSUPPORTED); 2994 return NULL; 2995 } 2996 2997 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2998 { 2999 error_setg(errp, QERR_UNSUPPORTED); 3000 return -1; 3001 } 3002 3003 void qmp_guest_set_user_password(const char *username, 3004 const char *password, 3005 bool crypted, 3006 Error **errp) 3007 { 3008 error_setg(errp, QERR_UNSUPPORTED); 3009 } 3010 3011 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 3012 { 3013 error_setg(errp, QERR_UNSUPPORTED); 3014 return NULL; 3015 } 3016 3017 GuestMemoryBlockResponseList * 3018 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 3019 { 3020 error_setg(errp, QERR_UNSUPPORTED); 3021 return NULL; 3022 } 3023 3024 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 3025 { 3026 error_setg(errp, QERR_UNSUPPORTED); 3027 return NULL; 3028 } 3029 3030 #endif 3031 3032 #if !defined(CONFIG_FSFREEZE) 3033 3034 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 3035 { 3036 error_setg(errp, QERR_UNSUPPORTED); 3037 return NULL; 3038 } 3039 3040 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 3041 { 3042 error_setg(errp, QERR_UNSUPPORTED); 3043 3044 return 0; 3045 } 3046 3047 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 3048 { 3049 error_setg(errp, QERR_UNSUPPORTED); 3050 3051 return 0; 3052 } 3053 3054 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 3055 strList *mountpoints, 3056 Error **errp) 3057 { 3058 error_setg(errp, QERR_UNSUPPORTED); 3059 3060 return 0; 3061 } 3062 3063 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 3064 { 3065 error_setg(errp, QERR_UNSUPPORTED); 3066 3067 return 0; 3068 } 3069 3070 GuestDiskInfoList *qmp_guest_get_disks(Error **errp) 3071 { 3072 error_setg(errp, QERR_UNSUPPORTED); 3073 return NULL; 3074 } 3075 3076 #endif /* CONFIG_FSFREEZE */ 3077 3078 #if !defined(CONFIG_FSTRIM) 3079 GuestFilesystemTrimResponse * 3080 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 3081 { 3082 error_setg(errp, QERR_UNSUPPORTED); 3083 return NULL; 3084 } 3085 #endif 3086 3087 /* add unsupported commands to the blacklist */ 3088 GList *ga_command_blacklist_init(GList *blacklist) 3089 { 3090 #if !defined(__linux__) 3091 { 3092 const char *list[] = { 3093 "guest-suspend-disk", "guest-suspend-ram", 3094 "guest-suspend-hybrid", "guest-network-get-interfaces", 3095 "guest-get-vcpus", "guest-set-vcpus", 3096 "guest-get-memory-blocks", "guest-set-memory-blocks", 3097 "guest-get-memory-block-size", "guest-get-memory-block-info", 3098 NULL}; 3099 char **p = (char **)list; 3100 3101 while (*p) { 3102 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3103 } 3104 } 3105 #endif 3106 3107 #if !defined(CONFIG_FSFREEZE) 3108 { 3109 const char *list[] = { 3110 "guest-get-fsinfo", "guest-fsfreeze-status", 3111 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 3112 "guest-fsfreeze-thaw", "guest-get-fsinfo", 3113 "guest-get-disks", NULL}; 3114 char **p = (char **)list; 3115 3116 while (*p) { 3117 blacklist = g_list_append(blacklist, g_strdup(*p++)); 3118 } 3119 } 3120 #endif 3121 3122 #if !defined(CONFIG_FSTRIM) 3123 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 3124 #endif 3125 3126 blacklist = g_list_append(blacklist, g_strdup("guest-get-devices")); 3127 3128 return blacklist; 3129 } 3130 3131 /* register init/cleanup routines for stateful command groups */ 3132 void ga_command_state_init(GAState *s, GACommandState *cs) 3133 { 3134 #if defined(CONFIG_FSFREEZE) 3135 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 3136 #endif 3137 } 3138 3139 #ifdef HAVE_UTMPX 3140 3141 #define QGA_MICRO_SECOND_TO_SECOND 1000000 3142 3143 static double ga_get_login_time(struct utmpx *user_info) 3144 { 3145 double seconds = (double)user_info->ut_tv.tv_sec; 3146 double useconds = (double)user_info->ut_tv.tv_usec; 3147 useconds /= QGA_MICRO_SECOND_TO_SECOND; 3148 return seconds + useconds; 3149 } 3150 3151 GuestUserList *qmp_guest_get_users(Error **errp) 3152 { 3153 GHashTable *cache = NULL; 3154 GuestUserList *head = NULL, *cur_item = NULL; 3155 struct utmpx *user_info = NULL; 3156 gpointer value = NULL; 3157 GuestUser *user = NULL; 3158 GuestUserList *item = NULL; 3159 double login_time = 0; 3160 3161 cache = g_hash_table_new(g_str_hash, g_str_equal); 3162 setutxent(); 3163 3164 for (;;) { 3165 user_info = getutxent(); 3166 if (user_info == NULL) { 3167 break; 3168 } else if (user_info->ut_type != USER_PROCESS) { 3169 continue; 3170 } else if (g_hash_table_contains(cache, user_info->ut_user)) { 3171 value = g_hash_table_lookup(cache, user_info->ut_user); 3172 user = (GuestUser *)value; 3173 login_time = ga_get_login_time(user_info); 3174 /* We're ensuring the earliest login time to be sent */ 3175 if (login_time < user->login_time) { 3176 user->login_time = login_time; 3177 } 3178 continue; 3179 } 3180 3181 item = g_new0(GuestUserList, 1); 3182 item->value = g_new0(GuestUser, 1); 3183 item->value->user = g_strdup(user_info->ut_user); 3184 item->value->login_time = ga_get_login_time(user_info); 3185 3186 g_hash_table_insert(cache, item->value->user, item->value); 3187 3188 if (!cur_item) { 3189 head = cur_item = item; 3190 } else { 3191 cur_item->next = item; 3192 cur_item = item; 3193 } 3194 } 3195 endutxent(); 3196 g_hash_table_destroy(cache); 3197 return head; 3198 } 3199 3200 #else 3201 3202 GuestUserList *qmp_guest_get_users(Error **errp) 3203 { 3204 error_setg(errp, QERR_UNSUPPORTED); 3205 return NULL; 3206 } 3207 3208 #endif 3209 3210 /* Replace escaped special characters with theire real values. The replacement 3211 * is done in place -- returned value is in the original string. 3212 */ 3213 static void ga_osrelease_replace_special(gchar *value) 3214 { 3215 gchar *p, *p2, quote; 3216 3217 /* Trim the string at first space or semicolon if it is not enclosed in 3218 * single or double quotes. */ 3219 if ((value[0] != '"') || (value[0] == '\'')) { 3220 p = strchr(value, ' '); 3221 if (p != NULL) { 3222 *p = 0; 3223 } 3224 p = strchr(value, ';'); 3225 if (p != NULL) { 3226 *p = 0; 3227 } 3228 return; 3229 } 3230 3231 quote = value[0]; 3232 p2 = value; 3233 p = value + 1; 3234 while (*p != 0) { 3235 if (*p == '\\') { 3236 p++; 3237 switch (*p) { 3238 case '$': 3239 case '\'': 3240 case '"': 3241 case '\\': 3242 case '`': 3243 break; 3244 default: 3245 /* Keep literal backslash followed by whatever is there */ 3246 p--; 3247 break; 3248 } 3249 } else if (*p == quote) { 3250 *p2 = 0; 3251 break; 3252 } 3253 *(p2++) = *(p++); 3254 } 3255 } 3256 3257 static GKeyFile *ga_parse_osrelease(const char *fname) 3258 { 3259 gchar *content = NULL; 3260 gchar *content2 = NULL; 3261 GError *err = NULL; 3262 GKeyFile *keys = g_key_file_new(); 3263 const char *group = "[os-release]\n"; 3264 3265 if (!g_file_get_contents(fname, &content, NULL, &err)) { 3266 slog("failed to read '%s', error: %s", fname, err->message); 3267 goto fail; 3268 } 3269 3270 if (!g_utf8_validate(content, -1, NULL)) { 3271 slog("file is not utf-8 encoded: %s", fname); 3272 goto fail; 3273 } 3274 content2 = g_strdup_printf("%s%s", group, content); 3275 3276 if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE, 3277 &err)) { 3278 slog("failed to parse file '%s', error: %s", fname, err->message); 3279 goto fail; 3280 } 3281 3282 g_free(content); 3283 g_free(content2); 3284 return keys; 3285 3286 fail: 3287 g_error_free(err); 3288 g_free(content); 3289 g_free(content2); 3290 g_key_file_free(keys); 3291 return NULL; 3292 } 3293 3294 GuestOSInfo *qmp_guest_get_osinfo(Error **errp) 3295 { 3296 GuestOSInfo *info = NULL; 3297 struct utsname kinfo; 3298 GKeyFile *osrelease = NULL; 3299 const char *qga_os_release = g_getenv("QGA_OS_RELEASE"); 3300 3301 info = g_new0(GuestOSInfo, 1); 3302 3303 if (uname(&kinfo) != 0) { 3304 error_setg_errno(errp, errno, "uname failed"); 3305 } else { 3306 info->has_kernel_version = true; 3307 info->kernel_version = g_strdup(kinfo.version); 3308 info->has_kernel_release = true; 3309 info->kernel_release = g_strdup(kinfo.release); 3310 info->has_machine = true; 3311 info->machine = g_strdup(kinfo.machine); 3312 } 3313 3314 if (qga_os_release != NULL) { 3315 osrelease = ga_parse_osrelease(qga_os_release); 3316 } else { 3317 osrelease = ga_parse_osrelease("/etc/os-release"); 3318 if (osrelease == NULL) { 3319 osrelease = ga_parse_osrelease("/usr/lib/os-release"); 3320 } 3321 } 3322 3323 if (osrelease != NULL) { 3324 char *value; 3325 3326 #define GET_FIELD(field, osfield) do { \ 3327 value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \ 3328 if (value != NULL) { \ 3329 ga_osrelease_replace_special(value); \ 3330 info->has_ ## field = true; \ 3331 info->field = value; \ 3332 } \ 3333 } while (0) 3334 GET_FIELD(id, "ID"); 3335 GET_FIELD(name, "NAME"); 3336 GET_FIELD(pretty_name, "PRETTY_NAME"); 3337 GET_FIELD(version, "VERSION"); 3338 GET_FIELD(version_id, "VERSION_ID"); 3339 GET_FIELD(variant, "VARIANT"); 3340 GET_FIELD(variant_id, "VARIANT_ID"); 3341 #undef GET_FIELD 3342 3343 g_key_file_free(osrelease); 3344 } 3345 3346 return info; 3347 } 3348 3349 GuestDeviceInfoList *qmp_guest_get_devices(Error **errp) 3350 { 3351 error_setg(errp, QERR_UNSUPPORTED); 3352 3353 return NULL; 3354 } 3355