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 <glib.h> 16 #include <sys/ioctl.h> 17 #include <sys/wait.h> 18 #include <dirent.h> 19 #include "qga/guest-agent-core.h" 20 #include "qga-qmp-commands.h" 21 #include "qapi/qmp/qerror.h" 22 #include "qemu/queue.h" 23 #include "qemu/host-utils.h" 24 #include "qemu/sockets.h" 25 #include "qemu/base64.h" 26 27 #ifndef CONFIG_HAS_ENVIRON 28 #ifdef __APPLE__ 29 #include <crt_externs.h> 30 #define environ (*_NSGetEnviron()) 31 #else 32 extern char **environ; 33 #endif 34 #endif 35 36 #if defined(__linux__) 37 #include <mntent.h> 38 #include <linux/fs.h> 39 #include <ifaddrs.h> 40 #include <arpa/inet.h> 41 #include <sys/socket.h> 42 #include <net/if.h> 43 44 #ifdef FIFREEZE 45 #define CONFIG_FSFREEZE 46 #endif 47 #ifdef FITRIM 48 #define CONFIG_FSTRIM 49 #endif 50 #endif 51 52 static void ga_wait_child(pid_t pid, int *status, Error **errp) 53 { 54 pid_t rpid; 55 56 *status = 0; 57 58 do { 59 rpid = waitpid(pid, status, 0); 60 } while (rpid == -1 && errno == EINTR); 61 62 if (rpid == -1) { 63 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)", 64 pid); 65 return; 66 } 67 68 g_assert(rpid == pid); 69 } 70 71 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp) 72 { 73 const char *shutdown_flag; 74 Error *local_err = NULL; 75 pid_t pid; 76 int status; 77 78 slog("guest-shutdown called, mode: %s", mode); 79 if (!has_mode || strcmp(mode, "powerdown") == 0) { 80 shutdown_flag = "-P"; 81 } else if (strcmp(mode, "halt") == 0) { 82 shutdown_flag = "-H"; 83 } else if (strcmp(mode, "reboot") == 0) { 84 shutdown_flag = "-r"; 85 } else { 86 error_setg(errp, 87 "mode is invalid (valid values are: halt|powerdown|reboot"); 88 return; 89 } 90 91 pid = fork(); 92 if (pid == 0) { 93 /* child, start the shutdown */ 94 setsid(); 95 reopen_fd_to_null(0); 96 reopen_fd_to_null(1); 97 reopen_fd_to_null(2); 98 99 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0", 100 "hypervisor initiated shutdown", (char*)NULL, environ); 101 _exit(EXIT_FAILURE); 102 } else if (pid < 0) { 103 error_setg_errno(errp, errno, "failed to create child process"); 104 return; 105 } 106 107 ga_wait_child(pid, &status, &local_err); 108 if (local_err) { 109 error_propagate(errp, local_err); 110 return; 111 } 112 113 if (!WIFEXITED(status)) { 114 error_setg(errp, "child process has terminated abnormally"); 115 return; 116 } 117 118 if (WEXITSTATUS(status)) { 119 error_setg(errp, "child process has failed to shutdown"); 120 return; 121 } 122 123 /* succeeded */ 124 } 125 126 int64_t qmp_guest_get_time(Error **errp) 127 { 128 int ret; 129 qemu_timeval tq; 130 int64_t time_ns; 131 132 ret = qemu_gettimeofday(&tq); 133 if (ret < 0) { 134 error_setg_errno(errp, errno, "Failed to get time"); 135 return -1; 136 } 137 138 time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000; 139 return time_ns; 140 } 141 142 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp) 143 { 144 int ret; 145 int status; 146 pid_t pid; 147 Error *local_err = NULL; 148 struct timeval tv; 149 150 /* If user has passed a time, validate and set it. */ 151 if (has_time) { 152 GDate date = { 0, }; 153 154 /* year-2038 will overflow in case time_t is 32bit */ 155 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) { 156 error_setg(errp, "Time %" PRId64 " is too large", time_ns); 157 return; 158 } 159 160 tv.tv_sec = time_ns / 1000000000; 161 tv.tv_usec = (time_ns % 1000000000) / 1000; 162 g_date_set_time_t(&date, tv.tv_sec); 163 if (date.year < 1970 || date.year >= 2070) { 164 error_setg_errno(errp, errno, "Invalid time"); 165 return; 166 } 167 168 ret = settimeofday(&tv, NULL); 169 if (ret < 0) { 170 error_setg_errno(errp, errno, "Failed to set time to guest"); 171 return; 172 } 173 } 174 175 /* Now, if user has passed a time to set and the system time is set, we 176 * just need to synchronize the hardware clock. However, if no time was 177 * passed, user is requesting the opposite: set the system time from the 178 * hardware clock (RTC). */ 179 pid = fork(); 180 if (pid == 0) { 181 setsid(); 182 reopen_fd_to_null(0); 183 reopen_fd_to_null(1); 184 reopen_fd_to_null(2); 185 186 /* Use '/sbin/hwclock -w' to set RTC from the system time, 187 * or '/sbin/hwclock -s' to set the system time from RTC. */ 188 execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s", 189 NULL, environ); 190 _exit(EXIT_FAILURE); 191 } else if (pid < 0) { 192 error_setg_errno(errp, errno, "failed to create child process"); 193 return; 194 } 195 196 ga_wait_child(pid, &status, &local_err); 197 if (local_err) { 198 error_propagate(errp, local_err); 199 return; 200 } 201 202 if (!WIFEXITED(status)) { 203 error_setg(errp, "child process has terminated abnormally"); 204 return; 205 } 206 207 if (WEXITSTATUS(status)) { 208 error_setg(errp, "hwclock failed to set hardware clock to system time"); 209 return; 210 } 211 } 212 213 typedef enum { 214 RW_STATE_NEW, 215 RW_STATE_READING, 216 RW_STATE_WRITING, 217 } RwState; 218 219 typedef struct GuestFileHandle { 220 uint64_t id; 221 FILE *fh; 222 RwState state; 223 QTAILQ_ENTRY(GuestFileHandle) next; 224 } GuestFileHandle; 225 226 static struct { 227 QTAILQ_HEAD(, GuestFileHandle) filehandles; 228 } guest_file_state = { 229 .filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles), 230 }; 231 232 static int64_t guest_file_handle_add(FILE *fh, Error **errp) 233 { 234 GuestFileHandle *gfh; 235 int64_t handle; 236 237 handle = ga_get_fd_handle(ga_state, errp); 238 if (handle < 0) { 239 return -1; 240 } 241 242 gfh = g_new0(GuestFileHandle, 1); 243 gfh->id = handle; 244 gfh->fh = fh; 245 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next); 246 247 return handle; 248 } 249 250 static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp) 251 { 252 GuestFileHandle *gfh; 253 254 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next) 255 { 256 if (gfh->id == id) { 257 return gfh; 258 } 259 } 260 261 error_setg(errp, "handle '%" PRId64 "' has not been found", id); 262 return NULL; 263 } 264 265 typedef const char * const ccpc; 266 267 #ifndef O_BINARY 268 #define O_BINARY 0 269 #endif 270 271 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */ 272 static const struct { 273 ccpc *forms; 274 int oflag_base; 275 } guest_file_open_modes[] = { 276 { (ccpc[]){ "r", NULL }, O_RDONLY }, 277 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY }, 278 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC }, 279 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY }, 280 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND }, 281 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY }, 282 { (ccpc[]){ "r+", NULL }, O_RDWR }, 283 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY }, 284 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC }, 285 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY }, 286 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND }, 287 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY } 288 }; 289 290 static int 291 find_open_flag(const char *mode_str, Error **errp) 292 { 293 unsigned mode; 294 295 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) { 296 ccpc *form; 297 298 form = guest_file_open_modes[mode].forms; 299 while (*form != NULL && strcmp(*form, mode_str) != 0) { 300 ++form; 301 } 302 if (*form != NULL) { 303 break; 304 } 305 } 306 307 if (mode == ARRAY_SIZE(guest_file_open_modes)) { 308 error_setg(errp, "invalid file open mode '%s'", mode_str); 309 return -1; 310 } 311 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK; 312 } 313 314 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \ 315 S_IRGRP | S_IWGRP | \ 316 S_IROTH | S_IWOTH) 317 318 static FILE * 319 safe_open_or_create(const char *path, const char *mode, Error **errp) 320 { 321 Error *local_err = NULL; 322 int oflag; 323 324 oflag = find_open_flag(mode, &local_err); 325 if (local_err == NULL) { 326 int fd; 327 328 /* If the caller wants / allows creation of a new file, we implement it 329 * with a two step process: open() + (open() / fchmod()). 330 * 331 * First we insist on creating the file exclusively as a new file. If 332 * that succeeds, we're free to set any file-mode bits on it. (The 333 * motivation is that we want to set those file-mode bits independently 334 * of the current umask.) 335 * 336 * If the exclusive creation fails because the file already exists 337 * (EEXIST is not possible for any other reason), we just attempt to 338 * open the file, but in this case we won't be allowed to change the 339 * file-mode bits on the preexistent file. 340 * 341 * The pathname should never disappear between the two open()s in 342 * practice. If it happens, then someone very likely tried to race us. 343 * In this case just go ahead and report the ENOENT from the second 344 * open() to the caller. 345 * 346 * If the caller wants to open a preexistent file, then the first 347 * open() is decisive and its third argument is ignored, and the second 348 * open() and the fchmod() are never called. 349 */ 350 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0); 351 if (fd == -1 && errno == EEXIST) { 352 oflag &= ~(unsigned)O_CREAT; 353 fd = open(path, oflag); 354 } 355 356 if (fd == -1) { 357 error_setg_errno(&local_err, errno, "failed to open file '%s' " 358 "(mode: '%s')", path, mode); 359 } else { 360 qemu_set_cloexec(fd); 361 362 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) { 363 error_setg_errno(&local_err, errno, "failed to set permission " 364 "0%03o on new file '%s' (mode: '%s')", 365 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode); 366 } else { 367 FILE *f; 368 369 f = fdopen(fd, mode); 370 if (f == NULL) { 371 error_setg_errno(&local_err, errno, "failed to associate " 372 "stdio stream with file descriptor %d, " 373 "file '%s' (mode: '%s')", fd, path, mode); 374 } else { 375 return f; 376 } 377 } 378 379 close(fd); 380 if (oflag & O_CREAT) { 381 unlink(path); 382 } 383 } 384 } 385 386 error_propagate(errp, local_err); 387 return NULL; 388 } 389 390 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, 391 Error **errp) 392 { 393 FILE *fh; 394 Error *local_err = NULL; 395 int64_t handle; 396 397 if (!has_mode) { 398 mode = "r"; 399 } 400 slog("guest-file-open called, filepath: %s, mode: %s", path, mode); 401 fh = safe_open_or_create(path, mode, &local_err); 402 if (local_err != NULL) { 403 error_propagate(errp, local_err); 404 return -1; 405 } 406 407 /* set fd non-blocking to avoid common use cases (like reading from a 408 * named pipe) from hanging the agent 409 */ 410 qemu_set_nonblock(fileno(fh)); 411 412 handle = guest_file_handle_add(fh, errp); 413 if (handle < 0) { 414 fclose(fh); 415 return -1; 416 } 417 418 slog("guest-file-open, handle: %" PRId64, handle); 419 return handle; 420 } 421 422 void qmp_guest_file_close(int64_t handle, Error **errp) 423 { 424 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 425 int ret; 426 427 slog("guest-file-close called, handle: %" PRId64, handle); 428 if (!gfh) { 429 return; 430 } 431 432 ret = fclose(gfh->fh); 433 if (ret == EOF) { 434 error_setg_errno(errp, errno, "failed to close handle"); 435 return; 436 } 437 438 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next); 439 g_free(gfh); 440 } 441 442 struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count, 443 int64_t count, Error **errp) 444 { 445 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 446 GuestFileRead *read_data = NULL; 447 guchar *buf; 448 FILE *fh; 449 size_t read_count; 450 451 if (!gfh) { 452 return NULL; 453 } 454 455 if (!has_count) { 456 count = QGA_READ_COUNT_DEFAULT; 457 } else if (count < 0) { 458 error_setg(errp, "value '%" PRId64 "' is invalid for argument count", 459 count); 460 return NULL; 461 } 462 463 fh = gfh->fh; 464 465 /* explicitly flush when switching from writing to reading */ 466 if (gfh->state == RW_STATE_WRITING) { 467 int ret = fflush(fh); 468 if (ret == EOF) { 469 error_setg_errno(errp, errno, "failed to flush file"); 470 return NULL; 471 } 472 gfh->state = RW_STATE_NEW; 473 } 474 475 buf = g_malloc0(count+1); 476 read_count = fread(buf, 1, count, fh); 477 if (ferror(fh)) { 478 error_setg_errno(errp, errno, "failed to read file"); 479 slog("guest-file-read failed, handle: %" PRId64, handle); 480 } else { 481 buf[read_count] = 0; 482 read_data = g_new0(GuestFileRead, 1); 483 read_data->count = read_count; 484 read_data->eof = feof(fh); 485 if (read_count) { 486 read_data->buf_b64 = g_base64_encode(buf, read_count); 487 } 488 gfh->state = RW_STATE_READING; 489 } 490 g_free(buf); 491 clearerr(fh); 492 493 return read_data; 494 } 495 496 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64, 497 bool has_count, int64_t count, 498 Error **errp) 499 { 500 GuestFileWrite *write_data = NULL; 501 guchar *buf; 502 gsize buf_len; 503 int write_count; 504 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 505 FILE *fh; 506 507 if (!gfh) { 508 return NULL; 509 } 510 511 fh = gfh->fh; 512 513 if (gfh->state == RW_STATE_READING) { 514 int ret = fseek(fh, 0, SEEK_CUR); 515 if (ret == -1) { 516 error_setg_errno(errp, errno, "failed to seek file"); 517 return NULL; 518 } 519 gfh->state = RW_STATE_NEW; 520 } 521 522 buf = qbase64_decode(buf_b64, -1, &buf_len, errp); 523 if (!buf) { 524 return NULL; 525 } 526 527 if (!has_count) { 528 count = buf_len; 529 } else if (count < 0 || count > buf_len) { 530 error_setg(errp, "value '%" PRId64 "' is invalid for argument count", 531 count); 532 g_free(buf); 533 return NULL; 534 } 535 536 write_count = fwrite(buf, 1, count, fh); 537 if (ferror(fh)) { 538 error_setg_errno(errp, errno, "failed to write to file"); 539 slog("guest-file-write failed, handle: %" PRId64, handle); 540 } else { 541 write_data = g_new0(GuestFileWrite, 1); 542 write_data->count = write_count; 543 write_data->eof = feof(fh); 544 gfh->state = RW_STATE_WRITING; 545 } 546 g_free(buf); 547 clearerr(fh); 548 549 return write_data; 550 } 551 552 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset, 553 int64_t whence_code, Error **errp) 554 { 555 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 556 GuestFileSeek *seek_data = NULL; 557 FILE *fh; 558 int ret; 559 int whence; 560 561 if (!gfh) { 562 return NULL; 563 } 564 565 /* We stupidly exposed 'whence':'int' in our qapi */ 566 switch (whence_code) { 567 case QGA_SEEK_SET: 568 whence = SEEK_SET; 569 break; 570 case QGA_SEEK_CUR: 571 whence = SEEK_CUR; 572 break; 573 case QGA_SEEK_END: 574 whence = SEEK_END; 575 break; 576 default: 577 error_setg(errp, "invalid whence code %"PRId64, whence_code); 578 return NULL; 579 } 580 581 fh = gfh->fh; 582 ret = fseek(fh, offset, whence); 583 if (ret == -1) { 584 error_setg_errno(errp, errno, "failed to seek file"); 585 if (errno == ESPIPE) { 586 /* file is non-seekable, stdio shouldn't be buffering anyways */ 587 gfh->state = RW_STATE_NEW; 588 } 589 } else { 590 seek_data = g_new0(GuestFileSeek, 1); 591 seek_data->position = ftell(fh); 592 seek_data->eof = feof(fh); 593 gfh->state = RW_STATE_NEW; 594 } 595 clearerr(fh); 596 597 return seek_data; 598 } 599 600 void qmp_guest_file_flush(int64_t handle, Error **errp) 601 { 602 GuestFileHandle *gfh = guest_file_handle_find(handle, errp); 603 FILE *fh; 604 int ret; 605 606 if (!gfh) { 607 return; 608 } 609 610 fh = gfh->fh; 611 ret = fflush(fh); 612 if (ret == EOF) { 613 error_setg_errno(errp, errno, "failed to flush file"); 614 } else { 615 gfh->state = RW_STATE_NEW; 616 } 617 } 618 619 /* linux-specific implementations. avoid this if at all possible. */ 620 #if defined(__linux__) 621 622 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM) 623 typedef struct FsMount { 624 char *dirname; 625 char *devtype; 626 unsigned int devmajor, devminor; 627 QTAILQ_ENTRY(FsMount) next; 628 } FsMount; 629 630 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList; 631 632 static void free_fs_mount_list(FsMountList *mounts) 633 { 634 FsMount *mount, *temp; 635 636 if (!mounts) { 637 return; 638 } 639 640 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) { 641 QTAILQ_REMOVE(mounts, mount, next); 642 g_free(mount->dirname); 643 g_free(mount->devtype); 644 g_free(mount); 645 } 646 } 647 648 static int dev_major_minor(const char *devpath, 649 unsigned int *devmajor, unsigned int *devminor) 650 { 651 struct stat st; 652 653 *devmajor = 0; 654 *devminor = 0; 655 656 if (stat(devpath, &st) < 0) { 657 slog("failed to stat device file '%s': %s", devpath, strerror(errno)); 658 return -1; 659 } 660 if (S_ISDIR(st.st_mode)) { 661 /* It is bind mount */ 662 return -2; 663 } 664 if (S_ISBLK(st.st_mode)) { 665 *devmajor = major(st.st_rdev); 666 *devminor = minor(st.st_rdev); 667 return 0; 668 } 669 return -1; 670 } 671 672 /* 673 * Walk the mount table and build a list of local file systems 674 */ 675 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp) 676 { 677 struct mntent *ment; 678 FsMount *mount; 679 char const *mtab = "/proc/self/mounts"; 680 FILE *fp; 681 unsigned int devmajor, devminor; 682 683 fp = setmntent(mtab, "r"); 684 if (!fp) { 685 error_setg(errp, "failed to open mtab file: '%s'", mtab); 686 return; 687 } 688 689 while ((ment = getmntent(fp))) { 690 /* 691 * An entry which device name doesn't start with a '/' is 692 * either a dummy file system or a network file system. 693 * Add special handling for smbfs and cifs as is done by 694 * coreutils as well. 695 */ 696 if ((ment->mnt_fsname[0] != '/') || 697 (strcmp(ment->mnt_type, "smbfs") == 0) || 698 (strcmp(ment->mnt_type, "cifs") == 0)) { 699 continue; 700 } 701 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) { 702 /* Skip bind mounts */ 703 continue; 704 } 705 706 mount = g_new0(FsMount, 1); 707 mount->dirname = g_strdup(ment->mnt_dir); 708 mount->devtype = g_strdup(ment->mnt_type); 709 mount->devmajor = devmajor; 710 mount->devminor = devminor; 711 712 QTAILQ_INSERT_TAIL(mounts, mount, next); 713 } 714 715 endmntent(fp); 716 } 717 718 static void decode_mntname(char *name, int len) 719 { 720 int i, j = 0; 721 for (i = 0; i <= len; i++) { 722 if (name[i] != '\\') { 723 name[j++] = name[i]; 724 } else if (name[i + 1] == '\\') { 725 name[j++] = '\\'; 726 i++; 727 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' && 728 name[i + 2] >= '0' && name[i + 2] <= '7' && 729 name[i + 3] >= '0' && name[i + 3] <= '7') { 730 name[j++] = (name[i + 1] - '0') * 64 + 731 (name[i + 2] - '0') * 8 + 732 (name[i + 3] - '0'); 733 i += 3; 734 } else { 735 name[j++] = name[i]; 736 } 737 } 738 } 739 740 static void build_fs_mount_list(FsMountList *mounts, Error **errp) 741 { 742 FsMount *mount; 743 char const *mountinfo = "/proc/self/mountinfo"; 744 FILE *fp; 745 char *line = NULL, *dash; 746 size_t n; 747 char check; 748 unsigned int devmajor, devminor; 749 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e; 750 751 fp = fopen(mountinfo, "r"); 752 if (!fp) { 753 build_fs_mount_list_from_mtab(mounts, errp); 754 return; 755 } 756 757 while (getline(&line, &n, fp) != -1) { 758 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c", 759 &devmajor, &devminor, &dir_s, &dir_e, &check); 760 if (ret < 3) { 761 continue; 762 } 763 dash = strstr(line + dir_e, " - "); 764 if (!dash) { 765 continue; 766 } 767 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c", 768 &type_s, &type_e, &dev_s, &dev_e, &check); 769 if (ret < 1) { 770 continue; 771 } 772 line[dir_e] = 0; 773 dash[type_e] = 0; 774 dash[dev_e] = 0; 775 decode_mntname(line + dir_s, dir_e - dir_s); 776 decode_mntname(dash + dev_s, dev_e - dev_s); 777 if (devmajor == 0) { 778 /* btrfs reports major number = 0 */ 779 if (strcmp("btrfs", dash + type_s) != 0 || 780 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) { 781 continue; 782 } 783 } 784 785 mount = g_new0(FsMount, 1); 786 mount->dirname = g_strdup(line + dir_s); 787 mount->devtype = g_strdup(dash + type_s); 788 mount->devmajor = devmajor; 789 mount->devminor = devminor; 790 791 QTAILQ_INSERT_TAIL(mounts, mount, next); 792 } 793 free(line); 794 795 fclose(fp); 796 } 797 #endif 798 799 #if defined(CONFIG_FSFREEZE) 800 801 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp) 802 { 803 char *path; 804 char *dpath; 805 char *driver = NULL; 806 char buf[PATH_MAX]; 807 ssize_t len; 808 809 path = g_strndup(syspath, pathlen); 810 dpath = g_strdup_printf("%s/driver", path); 811 len = readlink(dpath, buf, sizeof(buf) - 1); 812 if (len != -1) { 813 buf[len] = 0; 814 driver = g_strdup(basename(buf)); 815 } 816 g_free(dpath); 817 g_free(path); 818 return driver; 819 } 820 821 static int compare_uint(const void *_a, const void *_b) 822 { 823 unsigned int a = *(unsigned int *)_a; 824 unsigned int b = *(unsigned int *)_b; 825 826 return a < b ? -1 : a > b ? 1 : 0; 827 } 828 829 /* Walk the specified sysfs and build a sorted list of host or ata numbers */ 830 static int build_hosts(char const *syspath, char const *host, bool ata, 831 unsigned int *hosts, int hosts_max, Error **errp) 832 { 833 char *path; 834 DIR *dir; 835 struct dirent *entry; 836 int i = 0; 837 838 path = g_strndup(syspath, host - syspath); 839 dir = opendir(path); 840 if (!dir) { 841 error_setg_errno(errp, errno, "opendir(\"%s\")", path); 842 g_free(path); 843 return -1; 844 } 845 846 while (i < hosts_max) { 847 entry = readdir(dir); 848 if (!entry) { 849 break; 850 } 851 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) { 852 ++i; 853 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) { 854 ++i; 855 } 856 } 857 858 qsort(hosts, i, sizeof(hosts[0]), compare_uint); 859 860 g_free(path); 861 closedir(dir); 862 return i; 863 } 864 865 /* Store disk device info specified by @sysfs into @fs */ 866 static void build_guest_fsinfo_for_real_device(char const *syspath, 867 GuestFilesystemInfo *fs, 868 Error **errp) 869 { 870 unsigned int pci[4], host, hosts[8], tgt[3]; 871 int i, nhosts = 0, pcilen; 872 GuestDiskAddress *disk; 873 GuestPCIAddress *pciaddr; 874 GuestDiskAddressList *list = NULL; 875 bool has_ata = false, has_host = false, has_tgt = false; 876 char *p, *q, *driver = NULL; 877 878 p = strstr(syspath, "/devices/pci"); 879 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", 880 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { 881 g_debug("only pci device is supported: sysfs path \"%s\"", syspath); 882 return; 883 } 884 885 driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp); 886 if (!driver) { 887 goto cleanup; 888 } 889 890 p = strstr(syspath, "/target"); 891 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u", 892 tgt, tgt + 1, tgt + 2) == 3) { 893 has_tgt = true; 894 } 895 896 p = strstr(syspath, "/ata"); 897 if (p) { 898 q = p + 4; 899 has_ata = true; 900 } else { 901 p = strstr(syspath, "/host"); 902 q = p + 5; 903 } 904 if (p && sscanf(q, "%u", &host) == 1) { 905 has_host = true; 906 nhosts = build_hosts(syspath, p, has_ata, hosts, 907 sizeof(hosts) / sizeof(hosts[0]), errp); 908 if (nhosts < 0) { 909 goto cleanup; 910 } 911 } 912 913 pciaddr = g_malloc0(sizeof(*pciaddr)); 914 pciaddr->domain = pci[0]; 915 pciaddr->bus = pci[1]; 916 pciaddr->slot = pci[2]; 917 pciaddr->function = pci[3]; 918 919 disk = g_malloc0(sizeof(*disk)); 920 disk->pci_controller = pciaddr; 921 922 list = g_malloc0(sizeof(*list)); 923 list->value = disk; 924 925 if (strcmp(driver, "ata_piix") == 0) { 926 /* a host per ide bus, target*:0:<unit>:0 */ 927 if (!has_host || !has_tgt) { 928 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 929 goto cleanup; 930 } 931 for (i = 0; i < nhosts; i++) { 932 if (host == hosts[i]) { 933 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE; 934 disk->bus = i; 935 disk->unit = tgt[1]; 936 break; 937 } 938 } 939 if (i >= nhosts) { 940 g_debug("no host for '%s' (driver '%s')", syspath, driver); 941 goto cleanup; 942 } 943 } else if (strcmp(driver, "sym53c8xx") == 0) { 944 /* scsi(LSI Logic): target*:0:<unit>:0 */ 945 if (!has_tgt) { 946 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 947 goto cleanup; 948 } 949 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 950 disk->unit = tgt[1]; 951 } else if (strcmp(driver, "virtio-pci") == 0) { 952 if (has_tgt) { 953 /* virtio-scsi: target*:0:0:<unit> */ 954 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI; 955 disk->unit = tgt[2]; 956 } else { 957 /* virtio-blk: 1 disk per 1 device */ 958 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO; 959 } 960 } else if (strcmp(driver, "ahci") == 0) { 961 /* ahci: 1 host per 1 unit */ 962 if (!has_host || !has_tgt) { 963 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver); 964 goto cleanup; 965 } 966 for (i = 0; i < nhosts; i++) { 967 if (host == hosts[i]) { 968 disk->unit = i; 969 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA; 970 break; 971 } 972 } 973 if (i >= nhosts) { 974 g_debug("no host for '%s' (driver '%s')", syspath, driver); 975 goto cleanup; 976 } 977 } else { 978 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath); 979 goto cleanup; 980 } 981 982 list->next = fs->disk; 983 fs->disk = list; 984 g_free(driver); 985 return; 986 987 cleanup: 988 if (list) { 989 qapi_free_GuestDiskAddressList(list); 990 } 991 g_free(driver); 992 } 993 994 static void build_guest_fsinfo_for_device(char const *devpath, 995 GuestFilesystemInfo *fs, 996 Error **errp); 997 998 /* Store a list of slave devices of virtual volume specified by @syspath into 999 * @fs */ 1000 static void build_guest_fsinfo_for_virtual_device(char const *syspath, 1001 GuestFilesystemInfo *fs, 1002 Error **errp) 1003 { 1004 DIR *dir; 1005 char *dirpath; 1006 struct dirent *entry; 1007 1008 dirpath = g_strdup_printf("%s/slaves", syspath); 1009 dir = opendir(dirpath); 1010 if (!dir) { 1011 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath); 1012 g_free(dirpath); 1013 return; 1014 } 1015 1016 for (;;) { 1017 errno = 0; 1018 entry = readdir(dir); 1019 if (entry == NULL) { 1020 if (errno) { 1021 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath); 1022 } 1023 break; 1024 } 1025 1026 if (entry->d_type == DT_LNK) { 1027 char *path; 1028 1029 g_debug(" slave device '%s'", entry->d_name); 1030 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name); 1031 build_guest_fsinfo_for_device(path, fs, errp); 1032 g_free(path); 1033 1034 if (*errp) { 1035 break; 1036 } 1037 } 1038 } 1039 1040 g_free(dirpath); 1041 closedir(dir); 1042 } 1043 1044 /* Dispatch to functions for virtual/real device */ 1045 static void build_guest_fsinfo_for_device(char const *devpath, 1046 GuestFilesystemInfo *fs, 1047 Error **errp) 1048 { 1049 char *syspath = realpath(devpath, NULL); 1050 1051 if (!syspath) { 1052 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath); 1053 return; 1054 } 1055 1056 if (!fs->name) { 1057 fs->name = g_strdup(basename(syspath)); 1058 } 1059 1060 g_debug(" parse sysfs path '%s'", syspath); 1061 1062 if (strstr(syspath, "/devices/virtual/block/")) { 1063 build_guest_fsinfo_for_virtual_device(syspath, fs, errp); 1064 } else { 1065 build_guest_fsinfo_for_real_device(syspath, fs, errp); 1066 } 1067 1068 free(syspath); 1069 } 1070 1071 /* Return a list of the disk device(s)' info which @mount lies on */ 1072 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount, 1073 Error **errp) 1074 { 1075 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs)); 1076 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u", 1077 mount->devmajor, mount->devminor); 1078 1079 fs->mountpoint = g_strdup(mount->dirname); 1080 fs->type = g_strdup(mount->devtype); 1081 build_guest_fsinfo_for_device(devpath, fs, errp); 1082 1083 g_free(devpath); 1084 return fs; 1085 } 1086 1087 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 1088 { 1089 FsMountList mounts; 1090 struct FsMount *mount; 1091 GuestFilesystemInfoList *new, *ret = NULL; 1092 Error *local_err = NULL; 1093 1094 QTAILQ_INIT(&mounts); 1095 build_fs_mount_list(&mounts, &local_err); 1096 if (local_err) { 1097 error_propagate(errp, local_err); 1098 return NULL; 1099 } 1100 1101 QTAILQ_FOREACH(mount, &mounts, next) { 1102 g_debug("Building guest fsinfo for '%s'", mount->dirname); 1103 1104 new = g_malloc0(sizeof(*ret)); 1105 new->value = build_guest_fsinfo(mount, &local_err); 1106 new->next = ret; 1107 ret = new; 1108 if (local_err) { 1109 error_propagate(errp, local_err); 1110 qapi_free_GuestFilesystemInfoList(ret); 1111 ret = NULL; 1112 break; 1113 } 1114 } 1115 1116 free_fs_mount_list(&mounts); 1117 return ret; 1118 } 1119 1120 1121 typedef enum { 1122 FSFREEZE_HOOK_THAW = 0, 1123 FSFREEZE_HOOK_FREEZE, 1124 } FsfreezeHookArg; 1125 1126 static const char *fsfreeze_hook_arg_string[] = { 1127 "thaw", 1128 "freeze", 1129 }; 1130 1131 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp) 1132 { 1133 int status; 1134 pid_t pid; 1135 const char *hook; 1136 const char *arg_str = fsfreeze_hook_arg_string[arg]; 1137 Error *local_err = NULL; 1138 1139 hook = ga_fsfreeze_hook(ga_state); 1140 if (!hook) { 1141 return; 1142 } 1143 if (access(hook, X_OK) != 0) { 1144 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook); 1145 return; 1146 } 1147 1148 slog("executing fsfreeze hook with arg '%s'", arg_str); 1149 pid = fork(); 1150 if (pid == 0) { 1151 setsid(); 1152 reopen_fd_to_null(0); 1153 reopen_fd_to_null(1); 1154 reopen_fd_to_null(2); 1155 1156 execle(hook, hook, arg_str, NULL, environ); 1157 _exit(EXIT_FAILURE); 1158 } else if (pid < 0) { 1159 error_setg_errno(errp, errno, "failed to create child process"); 1160 return; 1161 } 1162 1163 ga_wait_child(pid, &status, &local_err); 1164 if (local_err) { 1165 error_propagate(errp, local_err); 1166 return; 1167 } 1168 1169 if (!WIFEXITED(status)) { 1170 error_setg(errp, "fsfreeze hook has terminated abnormally"); 1171 return; 1172 } 1173 1174 status = WEXITSTATUS(status); 1175 if (status) { 1176 error_setg(errp, "fsfreeze hook has failed with status %d", status); 1177 return; 1178 } 1179 } 1180 1181 /* 1182 * Return status of freeze/thaw 1183 */ 1184 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 1185 { 1186 if (ga_is_frozen(ga_state)) { 1187 return GUEST_FSFREEZE_STATUS_FROZEN; 1188 } 1189 1190 return GUEST_FSFREEZE_STATUS_THAWED; 1191 } 1192 1193 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 1194 { 1195 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp); 1196 } 1197 1198 /* 1199 * Walk list of mounted file systems in the guest, and freeze the ones which 1200 * are real local file systems. 1201 */ 1202 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 1203 strList *mountpoints, 1204 Error **errp) 1205 { 1206 int ret = 0, i = 0; 1207 strList *list; 1208 FsMountList mounts; 1209 struct FsMount *mount; 1210 Error *local_err = NULL; 1211 int fd; 1212 1213 slog("guest-fsfreeze called"); 1214 1215 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err); 1216 if (local_err) { 1217 error_propagate(errp, local_err); 1218 return -1; 1219 } 1220 1221 QTAILQ_INIT(&mounts); 1222 build_fs_mount_list(&mounts, &local_err); 1223 if (local_err) { 1224 error_propagate(errp, local_err); 1225 return -1; 1226 } 1227 1228 /* cannot risk guest agent blocking itself on a write in this state */ 1229 ga_set_frozen(ga_state); 1230 1231 QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) { 1232 /* To issue fsfreeze in the reverse order of mounts, check if the 1233 * mount is listed in the list here */ 1234 if (has_mountpoints) { 1235 for (list = mountpoints; list; list = list->next) { 1236 if (strcmp(list->value, mount->dirname) == 0) { 1237 break; 1238 } 1239 } 1240 if (!list) { 1241 continue; 1242 } 1243 } 1244 1245 fd = qemu_open(mount->dirname, O_RDONLY); 1246 if (fd == -1) { 1247 error_setg_errno(errp, errno, "failed to open %s", mount->dirname); 1248 goto error; 1249 } 1250 1251 /* we try to cull filesytems we know won't work in advance, but other 1252 * filesytems may not implement fsfreeze for less obvious reasons. 1253 * these will report EOPNOTSUPP. we simply ignore these when tallying 1254 * the number of frozen filesystems. 1255 * 1256 * any other error means a failure to freeze a filesystem we 1257 * expect to be freezable, so return an error in those cases 1258 * and return system to thawed state. 1259 */ 1260 ret = ioctl(fd, FIFREEZE); 1261 if (ret == -1) { 1262 if (errno != EOPNOTSUPP) { 1263 error_setg_errno(errp, errno, "failed to freeze %s", 1264 mount->dirname); 1265 close(fd); 1266 goto error; 1267 } 1268 } else { 1269 i++; 1270 } 1271 close(fd); 1272 } 1273 1274 free_fs_mount_list(&mounts); 1275 return i; 1276 1277 error: 1278 free_fs_mount_list(&mounts); 1279 qmp_guest_fsfreeze_thaw(NULL); 1280 return 0; 1281 } 1282 1283 /* 1284 * Walk list of frozen file systems in the guest, and thaw them. 1285 */ 1286 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 1287 { 1288 int ret; 1289 FsMountList mounts; 1290 FsMount *mount; 1291 int fd, i = 0, logged; 1292 Error *local_err = NULL; 1293 1294 QTAILQ_INIT(&mounts); 1295 build_fs_mount_list(&mounts, &local_err); 1296 if (local_err) { 1297 error_propagate(errp, local_err); 1298 return 0; 1299 } 1300 1301 QTAILQ_FOREACH(mount, &mounts, next) { 1302 logged = false; 1303 fd = qemu_open(mount->dirname, O_RDONLY); 1304 if (fd == -1) { 1305 continue; 1306 } 1307 /* we have no way of knowing whether a filesystem was actually unfrozen 1308 * as a result of a successful call to FITHAW, only that if an error 1309 * was returned the filesystem was *not* unfrozen by that particular 1310 * call. 1311 * 1312 * since multiple preceding FIFREEZEs require multiple calls to FITHAW 1313 * to unfreeze, continuing issuing FITHAW until an error is returned, 1314 * in which case either the filesystem is in an unfreezable state, or, 1315 * more likely, it was thawed previously (and remains so afterward). 1316 * 1317 * also, since the most recent successful call is the one that did 1318 * the actual unfreeze, we can use this to provide an accurate count 1319 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which 1320 * may * be useful for determining whether a filesystem was unfrozen 1321 * during the freeze/thaw phase by a process other than qemu-ga. 1322 */ 1323 do { 1324 ret = ioctl(fd, FITHAW); 1325 if (ret == 0 && !logged) { 1326 i++; 1327 logged = true; 1328 } 1329 } while (ret == 0); 1330 close(fd); 1331 } 1332 1333 ga_unset_frozen(ga_state); 1334 free_fs_mount_list(&mounts); 1335 1336 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp); 1337 1338 return i; 1339 } 1340 1341 static void guest_fsfreeze_cleanup(void) 1342 { 1343 Error *err = NULL; 1344 1345 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) { 1346 qmp_guest_fsfreeze_thaw(&err); 1347 if (err) { 1348 slog("failed to clean up frozen filesystems: %s", 1349 error_get_pretty(err)); 1350 error_free(err); 1351 } 1352 } 1353 } 1354 #endif /* CONFIG_FSFREEZE */ 1355 1356 #if defined(CONFIG_FSTRIM) 1357 /* 1358 * Walk list of mounted file systems in the guest, and trim them. 1359 */ 1360 GuestFilesystemTrimResponse * 1361 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 1362 { 1363 GuestFilesystemTrimResponse *response; 1364 GuestFilesystemTrimResultList *list; 1365 GuestFilesystemTrimResult *result; 1366 int ret = 0; 1367 FsMountList mounts; 1368 struct FsMount *mount; 1369 int fd; 1370 Error *local_err = NULL; 1371 struct fstrim_range r; 1372 1373 slog("guest-fstrim called"); 1374 1375 QTAILQ_INIT(&mounts); 1376 build_fs_mount_list(&mounts, &local_err); 1377 if (local_err) { 1378 error_propagate(errp, local_err); 1379 return NULL; 1380 } 1381 1382 response = g_malloc0(sizeof(*response)); 1383 1384 QTAILQ_FOREACH(mount, &mounts, next) { 1385 result = g_malloc0(sizeof(*result)); 1386 result->path = g_strdup(mount->dirname); 1387 1388 list = g_malloc0(sizeof(*list)); 1389 list->value = result; 1390 list->next = response->paths; 1391 response->paths = list; 1392 1393 fd = qemu_open(mount->dirname, O_RDONLY); 1394 if (fd == -1) { 1395 result->error = g_strdup_printf("failed to open: %s", 1396 strerror(errno)); 1397 result->has_error = true; 1398 continue; 1399 } 1400 1401 /* We try to cull filesytems we know won't work in advance, but other 1402 * filesytems may not implement fstrim for less obvious reasons. These 1403 * will report EOPNOTSUPP; while in some other cases ENOTTY will be 1404 * reported (e.g. CD-ROMs). 1405 * Any other error means an unexpected error. 1406 */ 1407 r.start = 0; 1408 r.len = -1; 1409 r.minlen = has_minimum ? minimum : 0; 1410 ret = ioctl(fd, FITRIM, &r); 1411 if (ret == -1) { 1412 result->has_error = true; 1413 if (errno == ENOTTY || errno == EOPNOTSUPP) { 1414 result->error = g_strdup("trim not supported"); 1415 } else { 1416 result->error = g_strdup_printf("failed to trim: %s", 1417 strerror(errno)); 1418 } 1419 close(fd); 1420 continue; 1421 } 1422 1423 result->has_minimum = true; 1424 result->minimum = r.minlen; 1425 result->has_trimmed = true; 1426 result->trimmed = r.len; 1427 close(fd); 1428 } 1429 1430 free_fs_mount_list(&mounts); 1431 return response; 1432 } 1433 #endif /* CONFIG_FSTRIM */ 1434 1435 1436 #define LINUX_SYS_STATE_FILE "/sys/power/state" 1437 #define SUSPEND_SUPPORTED 0 1438 #define SUSPEND_NOT_SUPPORTED 1 1439 1440 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg, 1441 const char *sysfile_str, Error **errp) 1442 { 1443 Error *local_err = NULL; 1444 char *pmutils_path; 1445 pid_t pid; 1446 int status; 1447 1448 pmutils_path = g_find_program_in_path(pmutils_bin); 1449 1450 pid = fork(); 1451 if (!pid) { 1452 char buf[32]; /* hopefully big enough */ 1453 ssize_t ret; 1454 int fd; 1455 1456 setsid(); 1457 reopen_fd_to_null(0); 1458 reopen_fd_to_null(1); 1459 reopen_fd_to_null(2); 1460 1461 if (pmutils_path) { 1462 execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ); 1463 } 1464 1465 /* 1466 * If we get here either pm-utils is not installed or execle() has 1467 * failed. Let's try the manual method if the caller wants it. 1468 */ 1469 1470 if (!sysfile_str) { 1471 _exit(SUSPEND_NOT_SUPPORTED); 1472 } 1473 1474 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY); 1475 if (fd < 0) { 1476 _exit(SUSPEND_NOT_SUPPORTED); 1477 } 1478 1479 ret = read(fd, buf, sizeof(buf)-1); 1480 if (ret <= 0) { 1481 _exit(SUSPEND_NOT_SUPPORTED); 1482 } 1483 buf[ret] = '\0'; 1484 1485 if (strstr(buf, sysfile_str)) { 1486 _exit(SUSPEND_SUPPORTED); 1487 } 1488 1489 _exit(SUSPEND_NOT_SUPPORTED); 1490 } else if (pid < 0) { 1491 error_setg_errno(errp, errno, "failed to create child process"); 1492 goto out; 1493 } 1494 1495 ga_wait_child(pid, &status, &local_err); 1496 if (local_err) { 1497 error_propagate(errp, local_err); 1498 goto out; 1499 } 1500 1501 if (!WIFEXITED(status)) { 1502 error_setg(errp, "child process has terminated abnormally"); 1503 goto out; 1504 } 1505 1506 switch (WEXITSTATUS(status)) { 1507 case SUSPEND_SUPPORTED: 1508 goto out; 1509 case SUSPEND_NOT_SUPPORTED: 1510 error_setg(errp, 1511 "the requested suspend mode is not supported by the guest"); 1512 goto out; 1513 default: 1514 error_setg(errp, 1515 "the helper program '%s' returned an unexpected exit status" 1516 " code (%d)", pmutils_path, WEXITSTATUS(status)); 1517 goto out; 1518 } 1519 1520 out: 1521 g_free(pmutils_path); 1522 } 1523 1524 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str, 1525 Error **errp) 1526 { 1527 Error *local_err = NULL; 1528 char *pmutils_path; 1529 pid_t pid; 1530 int status; 1531 1532 pmutils_path = g_find_program_in_path(pmutils_bin); 1533 1534 pid = fork(); 1535 if (pid == 0) { 1536 /* child */ 1537 int fd; 1538 1539 setsid(); 1540 reopen_fd_to_null(0); 1541 reopen_fd_to_null(1); 1542 reopen_fd_to_null(2); 1543 1544 if (pmutils_path) { 1545 execle(pmutils_path, pmutils_bin, NULL, environ); 1546 } 1547 1548 /* 1549 * If we get here either pm-utils is not installed or execle() has 1550 * failed. Let's try the manual method if the caller wants it. 1551 */ 1552 1553 if (!sysfile_str) { 1554 _exit(EXIT_FAILURE); 1555 } 1556 1557 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); 1558 if (fd < 0) { 1559 _exit(EXIT_FAILURE); 1560 } 1561 1562 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { 1563 _exit(EXIT_FAILURE); 1564 } 1565 1566 _exit(EXIT_SUCCESS); 1567 } else if (pid < 0) { 1568 error_setg_errno(errp, errno, "failed to create child process"); 1569 goto out; 1570 } 1571 1572 ga_wait_child(pid, &status, &local_err); 1573 if (local_err) { 1574 error_propagate(errp, local_err); 1575 goto out; 1576 } 1577 1578 if (!WIFEXITED(status)) { 1579 error_setg(errp, "child process has terminated abnormally"); 1580 goto out; 1581 } 1582 1583 if (WEXITSTATUS(status)) { 1584 error_setg(errp, "child process has failed to suspend"); 1585 goto out; 1586 } 1587 1588 out: 1589 g_free(pmutils_path); 1590 } 1591 1592 void qmp_guest_suspend_disk(Error **errp) 1593 { 1594 Error *local_err = NULL; 1595 1596 bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err); 1597 if (local_err) { 1598 error_propagate(errp, local_err); 1599 return; 1600 } 1601 1602 guest_suspend("pm-hibernate", "disk", errp); 1603 } 1604 1605 void qmp_guest_suspend_ram(Error **errp) 1606 { 1607 Error *local_err = NULL; 1608 1609 bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err); 1610 if (local_err) { 1611 error_propagate(errp, local_err); 1612 return; 1613 } 1614 1615 guest_suspend("pm-suspend", "mem", errp); 1616 } 1617 1618 void qmp_guest_suspend_hybrid(Error **errp) 1619 { 1620 Error *local_err = NULL; 1621 1622 bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, 1623 &local_err); 1624 if (local_err) { 1625 error_propagate(errp, local_err); 1626 return; 1627 } 1628 1629 guest_suspend("pm-suspend-hybrid", NULL, errp); 1630 } 1631 1632 static GuestNetworkInterfaceList * 1633 guest_find_interface(GuestNetworkInterfaceList *head, 1634 const char *name) 1635 { 1636 for (; head; head = head->next) { 1637 if (strcmp(head->value->name, name) == 0) { 1638 break; 1639 } 1640 } 1641 1642 return head; 1643 } 1644 1645 /* 1646 * Build information about guest interfaces 1647 */ 1648 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 1649 { 1650 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL; 1651 struct ifaddrs *ifap, *ifa; 1652 1653 if (getifaddrs(&ifap) < 0) { 1654 error_setg_errno(errp, errno, "getifaddrs failed"); 1655 goto error; 1656 } 1657 1658 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1659 GuestNetworkInterfaceList *info; 1660 GuestIpAddressList **address_list = NULL, *address_item = NULL; 1661 char addr4[INET_ADDRSTRLEN]; 1662 char addr6[INET6_ADDRSTRLEN]; 1663 int sock; 1664 struct ifreq ifr; 1665 unsigned char *mac_addr; 1666 void *p; 1667 1668 g_debug("Processing %s interface", ifa->ifa_name); 1669 1670 info = guest_find_interface(head, ifa->ifa_name); 1671 1672 if (!info) { 1673 info = g_malloc0(sizeof(*info)); 1674 info->value = g_malloc0(sizeof(*info->value)); 1675 info->value->name = g_strdup(ifa->ifa_name); 1676 1677 if (!cur_item) { 1678 head = cur_item = info; 1679 } else { 1680 cur_item->next = info; 1681 cur_item = info; 1682 } 1683 } 1684 1685 if (!info->value->has_hardware_address && 1686 ifa->ifa_flags & SIOCGIFHWADDR) { 1687 /* we haven't obtained HW address yet */ 1688 sock = socket(PF_INET, SOCK_STREAM, 0); 1689 if (sock == -1) { 1690 error_setg_errno(errp, errno, "failed to create socket"); 1691 goto error; 1692 } 1693 1694 memset(&ifr, 0, sizeof(ifr)); 1695 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name); 1696 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) { 1697 error_setg_errno(errp, errno, 1698 "failed to get MAC address of %s", 1699 ifa->ifa_name); 1700 close(sock); 1701 goto error; 1702 } 1703 1704 close(sock); 1705 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data; 1706 1707 info->value->hardware_address = 1708 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x", 1709 (int) mac_addr[0], (int) mac_addr[1], 1710 (int) mac_addr[2], (int) mac_addr[3], 1711 (int) mac_addr[4], (int) mac_addr[5]); 1712 1713 info->value->has_hardware_address = true; 1714 } 1715 1716 if (ifa->ifa_addr && 1717 ifa->ifa_addr->sa_family == AF_INET) { 1718 /* interface with IPv4 address */ 1719 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 1720 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) { 1721 error_setg_errno(errp, errno, "inet_ntop failed"); 1722 goto error; 1723 } 1724 1725 address_item = g_malloc0(sizeof(*address_item)); 1726 address_item->value = g_malloc0(sizeof(*address_item->value)); 1727 address_item->value->ip_address = g_strdup(addr4); 1728 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4; 1729 1730 if (ifa->ifa_netmask) { 1731 /* Count the number of set bits in netmask. 1732 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 1733 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr; 1734 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]); 1735 } 1736 } else if (ifa->ifa_addr && 1737 ifa->ifa_addr->sa_family == AF_INET6) { 1738 /* interface with IPv6 address */ 1739 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 1740 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) { 1741 error_setg_errno(errp, errno, "inet_ntop failed"); 1742 goto error; 1743 } 1744 1745 address_item = g_malloc0(sizeof(*address_item)); 1746 address_item->value = g_malloc0(sizeof(*address_item->value)); 1747 address_item->value->ip_address = g_strdup(addr6); 1748 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6; 1749 1750 if (ifa->ifa_netmask) { 1751 /* Count the number of set bits in netmask. 1752 * This is safe as '1' and '0' cannot be shuffled in netmask. */ 1753 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 1754 address_item->value->prefix = 1755 ctpop32(((uint32_t *) p)[0]) + 1756 ctpop32(((uint32_t *) p)[1]) + 1757 ctpop32(((uint32_t *) p)[2]) + 1758 ctpop32(((uint32_t *) p)[3]); 1759 } 1760 } 1761 1762 if (!address_item) { 1763 continue; 1764 } 1765 1766 address_list = &info->value->ip_addresses; 1767 1768 while (*address_list && (*address_list)->next) { 1769 address_list = &(*address_list)->next; 1770 } 1771 1772 if (!*address_list) { 1773 *address_list = address_item; 1774 } else { 1775 (*address_list)->next = address_item; 1776 } 1777 1778 info->value->has_ip_addresses = true; 1779 1780 1781 } 1782 1783 freeifaddrs(ifap); 1784 return head; 1785 1786 error: 1787 freeifaddrs(ifap); 1788 qapi_free_GuestNetworkInterfaceList(head); 1789 return NULL; 1790 } 1791 1792 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp)) 1793 1794 static long sysconf_exact(int name, const char *name_str, Error **errp) 1795 { 1796 long ret; 1797 1798 errno = 0; 1799 ret = sysconf(name); 1800 if (ret == -1) { 1801 if (errno == 0) { 1802 error_setg(errp, "sysconf(%s): value indefinite", name_str); 1803 } else { 1804 error_setg_errno(errp, errno, "sysconf(%s)", name_str); 1805 } 1806 } 1807 return ret; 1808 } 1809 1810 /* Transfer online/offline status between @vcpu and the guest system. 1811 * 1812 * On input either @errp or *@errp must be NULL. 1813 * 1814 * In system-to-@vcpu direction, the following @vcpu fields are accessed: 1815 * - R: vcpu->logical_id 1816 * - W: vcpu->online 1817 * - W: vcpu->can_offline 1818 * 1819 * In @vcpu-to-system direction, the following @vcpu fields are accessed: 1820 * - R: vcpu->logical_id 1821 * - R: vcpu->online 1822 * 1823 * Written members remain unmodified on error. 1824 */ 1825 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu, 1826 Error **errp) 1827 { 1828 char *dirpath; 1829 int dirfd; 1830 1831 dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/", 1832 vcpu->logical_id); 1833 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 1834 if (dirfd == -1) { 1835 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 1836 } else { 1837 static const char fn[] = "online"; 1838 int fd; 1839 int res; 1840 1841 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR); 1842 if (fd == -1) { 1843 if (errno != ENOENT) { 1844 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn); 1845 } else if (sys2vcpu) { 1846 vcpu->online = true; 1847 vcpu->can_offline = false; 1848 } else if (!vcpu->online) { 1849 error_setg(errp, "logical processor #%" PRId64 " can't be " 1850 "offlined", vcpu->logical_id); 1851 } /* otherwise pretend successful re-onlining */ 1852 } else { 1853 unsigned char status; 1854 1855 res = pread(fd, &status, 1, 0); 1856 if (res == -1) { 1857 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn); 1858 } else if (res == 0) { 1859 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath, 1860 fn); 1861 } else if (sys2vcpu) { 1862 vcpu->online = (status != '0'); 1863 vcpu->can_offline = true; 1864 } else if (vcpu->online != (status != '0')) { 1865 status = '0' + vcpu->online; 1866 if (pwrite(fd, &status, 1, 0) == -1) { 1867 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath, 1868 fn); 1869 } 1870 } /* otherwise pretend successful re-(on|off)-lining */ 1871 1872 res = close(fd); 1873 g_assert(res == 0); 1874 } 1875 1876 res = close(dirfd); 1877 g_assert(res == 0); 1878 } 1879 1880 g_free(dirpath); 1881 } 1882 1883 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 1884 { 1885 int64_t current; 1886 GuestLogicalProcessorList *head, **link; 1887 long sc_max; 1888 Error *local_err = NULL; 1889 1890 current = 0; 1891 head = NULL; 1892 link = &head; 1893 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err); 1894 1895 while (local_err == NULL && current < sc_max) { 1896 GuestLogicalProcessor *vcpu; 1897 GuestLogicalProcessorList *entry; 1898 1899 vcpu = g_malloc0(sizeof *vcpu); 1900 vcpu->logical_id = current++; 1901 vcpu->has_can_offline = true; /* lolspeak ftw */ 1902 transfer_vcpu(vcpu, true, &local_err); 1903 1904 entry = g_malloc0(sizeof *entry); 1905 entry->value = vcpu; 1906 1907 *link = entry; 1908 link = &entry->next; 1909 } 1910 1911 if (local_err == NULL) { 1912 /* there's no guest with zero VCPUs */ 1913 g_assert(head != NULL); 1914 return head; 1915 } 1916 1917 qapi_free_GuestLogicalProcessorList(head); 1918 error_propagate(errp, local_err); 1919 return NULL; 1920 } 1921 1922 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 1923 { 1924 int64_t processed; 1925 Error *local_err = NULL; 1926 1927 processed = 0; 1928 while (vcpus != NULL) { 1929 transfer_vcpu(vcpus->value, false, &local_err); 1930 if (local_err != NULL) { 1931 break; 1932 } 1933 ++processed; 1934 vcpus = vcpus->next; 1935 } 1936 1937 if (local_err != NULL) { 1938 if (processed == 0) { 1939 error_propagate(errp, local_err); 1940 } else { 1941 error_free(local_err); 1942 } 1943 } 1944 1945 return processed; 1946 } 1947 1948 void qmp_guest_set_user_password(const char *username, 1949 const char *password, 1950 bool crypted, 1951 Error **errp) 1952 { 1953 Error *local_err = NULL; 1954 char *passwd_path = NULL; 1955 pid_t pid; 1956 int status; 1957 int datafd[2] = { -1, -1 }; 1958 char *rawpasswddata = NULL; 1959 size_t rawpasswdlen; 1960 char *chpasswddata = NULL; 1961 size_t chpasswdlen; 1962 1963 rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp); 1964 if (!rawpasswddata) { 1965 return; 1966 } 1967 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1); 1968 rawpasswddata[rawpasswdlen] = '\0'; 1969 1970 if (strchr(rawpasswddata, '\n')) { 1971 error_setg(errp, "forbidden characters in raw password"); 1972 goto out; 1973 } 1974 1975 if (strchr(username, '\n') || 1976 strchr(username, ':')) { 1977 error_setg(errp, "forbidden characters in username"); 1978 goto out; 1979 } 1980 1981 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata); 1982 chpasswdlen = strlen(chpasswddata); 1983 1984 passwd_path = g_find_program_in_path("chpasswd"); 1985 1986 if (!passwd_path) { 1987 error_setg(errp, "cannot find 'passwd' program in PATH"); 1988 goto out; 1989 } 1990 1991 if (pipe(datafd) < 0) { 1992 error_setg(errp, "cannot create pipe FDs"); 1993 goto out; 1994 } 1995 1996 pid = fork(); 1997 if (pid == 0) { 1998 close(datafd[1]); 1999 /* child */ 2000 setsid(); 2001 dup2(datafd[0], 0); 2002 reopen_fd_to_null(1); 2003 reopen_fd_to_null(2); 2004 2005 if (crypted) { 2006 execle(passwd_path, "chpasswd", "-e", NULL, environ); 2007 } else { 2008 execle(passwd_path, "chpasswd", NULL, environ); 2009 } 2010 _exit(EXIT_FAILURE); 2011 } else if (pid < 0) { 2012 error_setg_errno(errp, errno, "failed to create child process"); 2013 goto out; 2014 } 2015 close(datafd[0]); 2016 datafd[0] = -1; 2017 2018 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) { 2019 error_setg_errno(errp, errno, "cannot write new account password"); 2020 goto out; 2021 } 2022 close(datafd[1]); 2023 datafd[1] = -1; 2024 2025 ga_wait_child(pid, &status, &local_err); 2026 if (local_err) { 2027 error_propagate(errp, local_err); 2028 goto out; 2029 } 2030 2031 if (!WIFEXITED(status)) { 2032 error_setg(errp, "child process has terminated abnormally"); 2033 goto out; 2034 } 2035 2036 if (WEXITSTATUS(status)) { 2037 error_setg(errp, "child process has failed to set user password"); 2038 goto out; 2039 } 2040 2041 out: 2042 g_free(chpasswddata); 2043 g_free(rawpasswddata); 2044 g_free(passwd_path); 2045 if (datafd[0] != -1) { 2046 close(datafd[0]); 2047 } 2048 if (datafd[1] != -1) { 2049 close(datafd[1]); 2050 } 2051 } 2052 2053 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, 2054 int size, Error **errp) 2055 { 2056 int fd; 2057 int res; 2058 2059 errno = 0; 2060 fd = openat(dirfd, pathname, O_RDONLY); 2061 if (fd == -1) { 2062 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2063 return; 2064 } 2065 2066 res = pread(fd, buf, size, 0); 2067 if (res == -1) { 2068 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); 2069 } else if (res == 0) { 2070 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); 2071 } 2072 close(fd); 2073 } 2074 2075 static void ga_write_sysfs_file(int dirfd, const char *pathname, 2076 const char *buf, int size, Error **errp) 2077 { 2078 int fd; 2079 2080 errno = 0; 2081 fd = openat(dirfd, pathname, O_WRONLY); 2082 if (fd == -1) { 2083 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); 2084 return; 2085 } 2086 2087 if (pwrite(fd, buf, size, 0) == -1) { 2088 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); 2089 } 2090 2091 close(fd); 2092 } 2093 2094 /* Transfer online/offline status between @mem_blk and the guest system. 2095 * 2096 * On input either @errp or *@errp must be NULL. 2097 * 2098 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: 2099 * - R: mem_blk->phys_index 2100 * - W: mem_blk->online 2101 * - W: mem_blk->can_offline 2102 * 2103 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: 2104 * - R: mem_blk->phys_index 2105 * - R: mem_blk->online 2106 *- R: mem_blk->can_offline 2107 * Written members remain unmodified on error. 2108 */ 2109 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, 2110 GuestMemoryBlockResponse *result, 2111 Error **errp) 2112 { 2113 char *dirpath; 2114 int dirfd; 2115 char *status; 2116 Error *local_err = NULL; 2117 2118 if (!sys2memblk) { 2119 DIR *dp; 2120 2121 if (!result) { 2122 error_setg(errp, "Internal error, 'result' should not be NULL"); 2123 return; 2124 } 2125 errno = 0; 2126 dp = opendir("/sys/devices/system/memory/"); 2127 /* if there is no 'memory' directory in sysfs, 2128 * we think this VM does not support online/offline memory block, 2129 * any other solution? 2130 */ 2131 if (!dp && errno == ENOENT) { 2132 result->response = 2133 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2134 goto out1; 2135 } 2136 closedir(dp); 2137 } 2138 2139 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", 2140 mem_blk->phys_index); 2141 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2142 if (dirfd == -1) { 2143 if (sys2memblk) { 2144 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2145 } else { 2146 if (errno == ENOENT) { 2147 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; 2148 } else { 2149 result->response = 2150 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2151 } 2152 } 2153 g_free(dirpath); 2154 goto out1; 2155 } 2156 g_free(dirpath); 2157 2158 status = g_malloc0(10); 2159 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); 2160 if (local_err) { 2161 /* treat with sysfs file that not exist in old kernel */ 2162 if (errno == ENOENT) { 2163 error_free(local_err); 2164 if (sys2memblk) { 2165 mem_blk->online = true; 2166 mem_blk->can_offline = false; 2167 } else if (!mem_blk->online) { 2168 result->response = 2169 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; 2170 } 2171 } else { 2172 if (sys2memblk) { 2173 error_propagate(errp, local_err); 2174 } else { 2175 result->response = 2176 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2177 } 2178 } 2179 goto out2; 2180 } 2181 2182 if (sys2memblk) { 2183 char removable = '0'; 2184 2185 mem_blk->online = (strncmp(status, "online", 6) == 0); 2186 2187 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); 2188 if (local_err) { 2189 /* if no 'removable' file, it doesn't support offline mem blk */ 2190 if (errno == ENOENT) { 2191 error_free(local_err); 2192 mem_blk->can_offline = false; 2193 } else { 2194 error_propagate(errp, local_err); 2195 } 2196 } else { 2197 mem_blk->can_offline = (removable != '0'); 2198 } 2199 } else { 2200 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { 2201 char *new_state = mem_blk->online ? g_strdup("online") : 2202 g_strdup("offline"); 2203 2204 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), 2205 &local_err); 2206 g_free(new_state); 2207 if (local_err) { 2208 error_free(local_err); 2209 result->response = 2210 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; 2211 goto out2; 2212 } 2213 2214 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; 2215 result->has_error_code = false; 2216 } /* otherwise pretend successful re-(on|off)-lining */ 2217 } 2218 g_free(status); 2219 close(dirfd); 2220 return; 2221 2222 out2: 2223 g_free(status); 2224 close(dirfd); 2225 out1: 2226 if (!sys2memblk) { 2227 result->has_error_code = true; 2228 result->error_code = errno; 2229 } 2230 } 2231 2232 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2233 { 2234 GuestMemoryBlockList *head, **link; 2235 Error *local_err = NULL; 2236 struct dirent *de; 2237 DIR *dp; 2238 2239 head = NULL; 2240 link = &head; 2241 2242 dp = opendir("/sys/devices/system/memory/"); 2243 if (!dp) { 2244 /* it's ok if this happens to be a system that doesn't expose 2245 * memory blocks via sysfs, but otherwise we should report 2246 * an error 2247 */ 2248 if (errno != ENOENT) { 2249 error_setg_errno(errp, errno, "Can't open directory" 2250 "\"/sys/devices/system/memory/\""); 2251 } 2252 return NULL; 2253 } 2254 2255 /* Note: the phys_index of memory block may be discontinuous, 2256 * this is because a memblk is the unit of the Sparse Memory design, which 2257 * allows discontinuous memory ranges (ex. NUMA), so here we should 2258 * traverse the memory block directory. 2259 */ 2260 while ((de = readdir(dp)) != NULL) { 2261 GuestMemoryBlock *mem_blk; 2262 GuestMemoryBlockList *entry; 2263 2264 if ((strncmp(de->d_name, "memory", 6) != 0) || 2265 !(de->d_type & DT_DIR)) { 2266 continue; 2267 } 2268 2269 mem_blk = g_malloc0(sizeof *mem_blk); 2270 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ 2271 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); 2272 mem_blk->has_can_offline = true; /* lolspeak ftw */ 2273 transfer_memory_block(mem_blk, true, NULL, &local_err); 2274 2275 entry = g_malloc0(sizeof *entry); 2276 entry->value = mem_blk; 2277 2278 *link = entry; 2279 link = &entry->next; 2280 } 2281 2282 closedir(dp); 2283 if (local_err == NULL) { 2284 /* there's no guest with zero memory blocks */ 2285 if (head == NULL) { 2286 error_setg(errp, "guest reported zero memory blocks!"); 2287 } 2288 return head; 2289 } 2290 2291 qapi_free_GuestMemoryBlockList(head); 2292 error_propagate(errp, local_err); 2293 return NULL; 2294 } 2295 2296 GuestMemoryBlockResponseList * 2297 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2298 { 2299 GuestMemoryBlockResponseList *head, **link; 2300 Error *local_err = NULL; 2301 2302 head = NULL; 2303 link = &head; 2304 2305 while (mem_blks != NULL) { 2306 GuestMemoryBlockResponse *result; 2307 GuestMemoryBlockResponseList *entry; 2308 GuestMemoryBlock *current_mem_blk = mem_blks->value; 2309 2310 result = g_malloc0(sizeof(*result)); 2311 result->phys_index = current_mem_blk->phys_index; 2312 transfer_memory_block(current_mem_blk, false, result, &local_err); 2313 if (local_err) { /* should never happen */ 2314 goto err; 2315 } 2316 entry = g_malloc0(sizeof *entry); 2317 entry->value = result; 2318 2319 *link = entry; 2320 link = &entry->next; 2321 mem_blks = mem_blks->next; 2322 } 2323 2324 return head; 2325 err: 2326 qapi_free_GuestMemoryBlockResponseList(head); 2327 error_propagate(errp, local_err); 2328 return NULL; 2329 } 2330 2331 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2332 { 2333 Error *local_err = NULL; 2334 char *dirpath; 2335 int dirfd; 2336 char *buf; 2337 GuestMemoryBlockInfo *info; 2338 2339 dirpath = g_strdup_printf("/sys/devices/system/memory/"); 2340 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); 2341 if (dirfd == -1) { 2342 error_setg_errno(errp, errno, "open(\"%s\")", dirpath); 2343 g_free(dirpath); 2344 return NULL; 2345 } 2346 g_free(dirpath); 2347 2348 buf = g_malloc0(20); 2349 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); 2350 close(dirfd); 2351 if (local_err) { 2352 g_free(buf); 2353 error_propagate(errp, local_err); 2354 return NULL; 2355 } 2356 2357 info = g_new0(GuestMemoryBlockInfo, 1); 2358 info->size = strtol(buf, NULL, 16); /* the unit is bytes */ 2359 2360 g_free(buf); 2361 2362 return info; 2363 } 2364 2365 #else /* defined(__linux__) */ 2366 2367 void qmp_guest_suspend_disk(Error **errp) 2368 { 2369 error_setg(errp, QERR_UNSUPPORTED); 2370 } 2371 2372 void qmp_guest_suspend_ram(Error **errp) 2373 { 2374 error_setg(errp, QERR_UNSUPPORTED); 2375 } 2376 2377 void qmp_guest_suspend_hybrid(Error **errp) 2378 { 2379 error_setg(errp, QERR_UNSUPPORTED); 2380 } 2381 2382 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp) 2383 { 2384 error_setg(errp, QERR_UNSUPPORTED); 2385 return NULL; 2386 } 2387 2388 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp) 2389 { 2390 error_setg(errp, QERR_UNSUPPORTED); 2391 return NULL; 2392 } 2393 2394 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp) 2395 { 2396 error_setg(errp, QERR_UNSUPPORTED); 2397 return -1; 2398 } 2399 2400 void qmp_guest_set_user_password(const char *username, 2401 const char *password, 2402 bool crypted, 2403 Error **errp) 2404 { 2405 error_setg(errp, QERR_UNSUPPORTED); 2406 } 2407 2408 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) 2409 { 2410 error_setg(errp, QERR_UNSUPPORTED); 2411 return NULL; 2412 } 2413 2414 GuestMemoryBlockResponseList * 2415 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) 2416 { 2417 error_setg(errp, QERR_UNSUPPORTED); 2418 return NULL; 2419 } 2420 2421 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) 2422 { 2423 error_setg(errp, QERR_UNSUPPORTED); 2424 return NULL; 2425 } 2426 2427 #endif 2428 2429 #if !defined(CONFIG_FSFREEZE) 2430 2431 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) 2432 { 2433 error_setg(errp, QERR_UNSUPPORTED); 2434 return NULL; 2435 } 2436 2437 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp) 2438 { 2439 error_setg(errp, QERR_UNSUPPORTED); 2440 2441 return 0; 2442 } 2443 2444 int64_t qmp_guest_fsfreeze_freeze(Error **errp) 2445 { 2446 error_setg(errp, QERR_UNSUPPORTED); 2447 2448 return 0; 2449 } 2450 2451 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints, 2452 strList *mountpoints, 2453 Error **errp) 2454 { 2455 error_setg(errp, QERR_UNSUPPORTED); 2456 2457 return 0; 2458 } 2459 2460 int64_t qmp_guest_fsfreeze_thaw(Error **errp) 2461 { 2462 error_setg(errp, QERR_UNSUPPORTED); 2463 2464 return 0; 2465 } 2466 #endif /* CONFIG_FSFREEZE */ 2467 2468 #if !defined(CONFIG_FSTRIM) 2469 GuestFilesystemTrimResponse * 2470 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp) 2471 { 2472 error_setg(errp, QERR_UNSUPPORTED); 2473 return NULL; 2474 } 2475 #endif 2476 2477 /* add unsupported commands to the blacklist */ 2478 GList *ga_command_blacklist_init(GList *blacklist) 2479 { 2480 #if !defined(__linux__) 2481 { 2482 const char *list[] = { 2483 "guest-suspend-disk", "guest-suspend-ram", 2484 "guest-suspend-hybrid", "guest-network-get-interfaces", 2485 "guest-get-vcpus", "guest-set-vcpus", 2486 "guest-get-memory-blocks", "guest-set-memory-blocks", 2487 "guest-get-memory-block-size", NULL}; 2488 char **p = (char **)list; 2489 2490 while (*p) { 2491 blacklist = g_list_append(blacklist, g_strdup(*p++)); 2492 } 2493 } 2494 #endif 2495 2496 #if !defined(CONFIG_FSFREEZE) 2497 { 2498 const char *list[] = { 2499 "guest-get-fsinfo", "guest-fsfreeze-status", 2500 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list", 2501 "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL}; 2502 char **p = (char **)list; 2503 2504 while (*p) { 2505 blacklist = g_list_append(blacklist, g_strdup(*p++)); 2506 } 2507 } 2508 #endif 2509 2510 #if !defined(CONFIG_FSTRIM) 2511 blacklist = g_list_append(blacklist, g_strdup("guest-fstrim")); 2512 #endif 2513 2514 return blacklist; 2515 } 2516 2517 /* register init/cleanup routines for stateful command groups */ 2518 void ga_command_state_init(GAState *s, GACommandState *cs) 2519 { 2520 #if defined(CONFIG_FSFREEZE) 2521 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup); 2522 #endif 2523 } 2524