1 /* 2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 3 * 4 * Network Block Device 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; under version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "qapi/error.h" 21 #include "qemu-common.h" 22 #include "qemu/cutils.h" 23 #include "sysemu/block-backend.h" 24 #include "block/block_int.h" 25 #include "block/nbd.h" 26 #include "qemu/main-loop.h" 27 #include "qemu/error-report.h" 28 #include "qemu/config-file.h" 29 #include "qemu/bswap.h" 30 #include "block/snapshot.h" 31 #include "qapi/util.h" 32 #include "qapi/qmp/qstring.h" 33 #include "qom/object_interfaces.h" 34 #include "io/channel-socket.h" 35 #include "crypto/init.h" 36 37 #include <getopt.h> 38 #include <libgen.h> 39 #include <pthread.h> 40 41 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 42 #define QEMU_NBD_OPT_CACHE 256 43 #define QEMU_NBD_OPT_AIO 257 44 #define QEMU_NBD_OPT_DISCARD 258 45 #define QEMU_NBD_OPT_DETECT_ZEROES 259 46 #define QEMU_NBD_OPT_OBJECT 260 47 #define QEMU_NBD_OPT_TLSCREDS 261 48 #define QEMU_NBD_OPT_IMAGE_OPTS 262 49 50 #define MBR_SIZE 512 51 52 static NBDExport *exp; 53 static bool newproto; 54 static int verbose; 55 static char *srcpath; 56 static SocketAddress *saddr; 57 static int persistent = 0; 58 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 59 static int shared = 1; 60 static int nb_fds; 61 static QIOChannelSocket *server_ioc; 62 static int server_watch = -1; 63 static QCryptoTLSCreds *tlscreds; 64 65 static void usage(const char *name) 66 { 67 (printf) ( 68 "Usage: %s [OPTIONS] FILE\n" 69 "QEMU Disk Network Block Device Server\n" 70 "\n" 71 " -h, --help display this help and exit\n" 72 " -V, --version output version information and exit\n" 73 "\n" 74 "Connection properties:\n" 75 " -p, --port=PORT port to listen on (default `%d')\n" 76 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 77 " -k, --socket=PATH path to the unix socket\n" 78 " (default '"SOCKET_PATH"')\n" 79 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 80 " -t, --persistent don't exit on the last connection\n" 81 " -v, --verbose display extra debugging information\n" 82 " -x, --export-name=NAME expose export by name\n" 83 "\n" 84 "Exposing part of the image:\n" 85 " -o, --offset=OFFSET offset into the image\n" 86 " -P, --partition=NUM only expose partition NUM\n" 87 "\n" 88 "General purpose options:\n" 89 " --object type,id=ID,... define an object such as 'secret' for providing\n" 90 " passwords and/or encryption keys\n" 91 #ifdef __linux__ 92 "Kernel NBD client support:\n" 93 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 94 " -d, --disconnect disconnect the specified device\n" 95 "\n" 96 #endif 97 "\n" 98 "Block device options:\n" 99 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 100 " -r, --read-only export read-only\n" 101 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 102 " file with backing_file=FILE, redirect the write to\n" 103 " the temporary one\n" 104 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 105 " load an internal snapshot inside FILE and export it\n" 106 " as an read-only device, SNAPSHOT_PARAM format is\n" 107 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 108 " '[ID_OR_NAME]'\n" 109 " -n, --nocache disable host cache\n" 110 " --cache=MODE set cache mode (none, writeback, ...)\n" 111 " --aio=MODE set AIO mode (native or threads)\n" 112 " --discard=MODE set discard mode (ignore, unmap)\n" 113 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 114 " --image-opts treat FILE as a full set of image options\n" 115 "\n" 116 "Report bugs to <qemu-devel@nongnu.org>\n" 117 , name, NBD_DEFAULT_PORT, "DEVICE"); 118 } 119 120 static void version(const char *name) 121 { 122 printf( 123 "%s version 0.0.1\n" 124 "Written by Anthony Liguori.\n" 125 "\n" 126 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 127 "This is free software; see the source for copying conditions. There is NO\n" 128 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 129 , name); 130 } 131 132 struct partition_record 133 { 134 uint8_t bootable; 135 uint8_t start_head; 136 uint32_t start_cylinder; 137 uint8_t start_sector; 138 uint8_t system; 139 uint8_t end_head; 140 uint8_t end_cylinder; 141 uint8_t end_sector; 142 uint32_t start_sector_abs; 143 uint32_t nb_sectors_abs; 144 }; 145 146 static void read_partition(uint8_t *p, struct partition_record *r) 147 { 148 r->bootable = p[0]; 149 r->start_head = p[1]; 150 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 151 r->start_sector = p[2] & 0x3f; 152 r->system = p[4]; 153 r->end_head = p[5]; 154 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 155 r->end_sector = p[6] & 0x3f; 156 157 r->start_sector_abs = ldl_le_p(p + 8); 158 r->nb_sectors_abs = ldl_le_p(p + 12); 159 } 160 161 static int find_partition(BlockBackend *blk, int partition, 162 off_t *offset, off_t *size) 163 { 164 struct partition_record mbr[4]; 165 uint8_t data[MBR_SIZE]; 166 int i; 167 int ext_partnum = 4; 168 int ret; 169 170 ret = blk_pread(blk, 0, data, sizeof(data)); 171 if (ret < 0) { 172 error_report("error while reading: %s", strerror(-ret)); 173 exit(EXIT_FAILURE); 174 } 175 176 if (data[510] != 0x55 || data[511] != 0xaa) { 177 return -EINVAL; 178 } 179 180 for (i = 0; i < 4; i++) { 181 read_partition(&data[446 + 16 * i], &mbr[i]); 182 183 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 184 continue; 185 } 186 187 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 188 struct partition_record ext[4]; 189 uint8_t data1[MBR_SIZE]; 190 int j; 191 192 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, 193 data1, sizeof(data1)); 194 if (ret < 0) { 195 error_report("error while reading: %s", strerror(-ret)); 196 exit(EXIT_FAILURE); 197 } 198 199 for (j = 0; j < 4; j++) { 200 read_partition(&data1[446 + 16 * j], &ext[j]); 201 if (!ext[j].system || !ext[j].nb_sectors_abs) { 202 continue; 203 } 204 205 if ((ext_partnum + j + 1) == partition) { 206 *offset = (uint64_t)ext[j].start_sector_abs << 9; 207 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 208 return 0; 209 } 210 } 211 ext_partnum += 4; 212 } else if ((i + 1) == partition) { 213 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 214 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 215 return 0; 216 } 217 } 218 219 return -ENOENT; 220 } 221 222 static void termsig_handler(int signum) 223 { 224 atomic_cmpxchg(&state, RUNNING, TERMINATE); 225 qemu_notify_event(); 226 } 227 228 229 static void *show_parts(void *arg) 230 { 231 char *device = arg; 232 int nbd; 233 234 /* linux just needs an open() to trigger 235 * the partition table update 236 * but remember to load the module with max_part != 0 : 237 * modprobe nbd max_part=63 238 */ 239 nbd = open(device, O_RDWR); 240 if (nbd >= 0) { 241 close(nbd); 242 } 243 return NULL; 244 } 245 246 static void *nbd_client_thread(void *arg) 247 { 248 char *device = arg; 249 off_t size; 250 uint32_t nbdflags; 251 QIOChannelSocket *sioc; 252 int fd; 253 int ret; 254 pthread_t show_parts_thread; 255 Error *local_error = NULL; 256 257 sioc = qio_channel_socket_new(); 258 if (qio_channel_socket_connect_sync(sioc, 259 saddr, 260 &local_error) < 0) { 261 error_report_err(local_error); 262 goto out; 263 } 264 265 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, 266 NULL, NULL, NULL, 267 &size, &local_error); 268 if (ret < 0) { 269 if (local_error) { 270 error_report_err(local_error); 271 } 272 goto out_socket; 273 } 274 275 fd = open(device, O_RDWR); 276 if (fd < 0) { 277 /* Linux-only, we can use %m in printf. */ 278 error_report("Failed to open %s: %m", device); 279 goto out_socket; 280 } 281 282 ret = nbd_init(fd, sioc, nbdflags, size); 283 if (ret < 0) { 284 goto out_fd; 285 } 286 287 /* update partition table */ 288 pthread_create(&show_parts_thread, NULL, show_parts, device); 289 290 if (verbose) { 291 fprintf(stderr, "NBD device %s is now connected to %s\n", 292 device, srcpath); 293 } else { 294 /* Close stderr so that the qemu-nbd process exits. */ 295 dup2(STDOUT_FILENO, STDERR_FILENO); 296 } 297 298 ret = nbd_client(fd); 299 if (ret) { 300 goto out_fd; 301 } 302 close(fd); 303 object_unref(OBJECT(sioc)); 304 kill(getpid(), SIGTERM); 305 return (void *) EXIT_SUCCESS; 306 307 out_fd: 308 close(fd); 309 out_socket: 310 object_unref(OBJECT(sioc)); 311 out: 312 kill(getpid(), SIGTERM); 313 return (void *) EXIT_FAILURE; 314 } 315 316 static int nbd_can_accept(void) 317 { 318 return nb_fds < shared; 319 } 320 321 static void nbd_export_closed(NBDExport *exp) 322 { 323 assert(state == TERMINATING); 324 state = TERMINATED; 325 } 326 327 static void nbd_update_server_watch(void); 328 329 static void nbd_client_closed(NBDClient *client) 330 { 331 nb_fds--; 332 if (nb_fds == 0 && !persistent && state == RUNNING) { 333 state = TERMINATE; 334 } 335 nbd_update_server_watch(); 336 nbd_client_put(client); 337 } 338 339 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 340 { 341 QIOChannelSocket *cioc; 342 343 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 344 NULL); 345 if (!cioc) { 346 return TRUE; 347 } 348 349 if (state >= TERMINATE) { 350 object_unref(OBJECT(cioc)); 351 return TRUE; 352 } 353 354 nb_fds++; 355 nbd_update_server_watch(); 356 nbd_client_new(newproto ? NULL : exp, cioc, 357 tlscreds, NULL, nbd_client_closed); 358 object_unref(OBJECT(cioc)); 359 360 return TRUE; 361 } 362 363 static void nbd_update_server_watch(void) 364 { 365 if (nbd_can_accept()) { 366 if (server_watch == -1) { 367 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 368 G_IO_IN, 369 nbd_accept, 370 NULL, NULL); 371 } 372 } else { 373 if (server_watch != -1) { 374 g_source_remove(server_watch); 375 server_watch = -1; 376 } 377 } 378 } 379 380 381 static SocketAddress *nbd_build_socket_address(const char *sockpath, 382 const char *bindto, 383 const char *port) 384 { 385 SocketAddress *saddr; 386 387 saddr = g_new0(SocketAddress, 1); 388 if (sockpath) { 389 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 390 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); 391 saddr->u.q_unix.data->path = g_strdup(sockpath); 392 } else { 393 InetSocketAddress *inet; 394 saddr->type = SOCKET_ADDRESS_KIND_INET; 395 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); 396 inet->host = g_strdup(bindto); 397 if (port) { 398 inet->port = g_strdup(port); 399 } else { 400 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 401 } 402 } 403 404 return saddr; 405 } 406 407 408 static QemuOptsList file_opts = { 409 .name = "file", 410 .implied_opt_name = "file", 411 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 412 .desc = { 413 /* no elements => accept any params */ 414 { /* end of list */ } 415 }, 416 }; 417 418 static QemuOptsList qemu_object_opts = { 419 .name = "object", 420 .implied_opt_name = "qom-type", 421 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 422 .desc = { 423 { } 424 }, 425 }; 426 427 428 429 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 430 { 431 Object *obj; 432 QCryptoTLSCreds *creds; 433 434 obj = object_resolve_path_component( 435 object_get_objects_root(), id); 436 if (!obj) { 437 error_setg(errp, "No TLS credentials with id '%s'", 438 id); 439 return NULL; 440 } 441 creds = (QCryptoTLSCreds *) 442 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 443 if (!creds) { 444 error_setg(errp, "Object with id '%s' is not TLS credentials", 445 id); 446 return NULL; 447 } 448 449 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 450 error_setg(errp, 451 "Expecting TLS credentials with a server endpoint"); 452 return NULL; 453 } 454 object_ref(obj); 455 return creds; 456 } 457 458 459 int main(int argc, char **argv) 460 { 461 BlockBackend *blk; 462 BlockDriverState *bs; 463 off_t dev_offset = 0; 464 uint32_t nbdflags = 0; 465 bool disconnect = false; 466 const char *bindto = "0.0.0.0"; 467 const char *port = NULL; 468 char *sockpath = NULL; 469 char *device = NULL; 470 off_t fd_size; 471 QemuOpts *sn_opts = NULL; 472 const char *sn_id_or_name = NULL; 473 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; 474 struct option lopt[] = { 475 { "help", no_argument, NULL, 'h' }, 476 { "version", no_argument, NULL, 'V' }, 477 { "bind", required_argument, NULL, 'b' }, 478 { "port", required_argument, NULL, 'p' }, 479 { "socket", required_argument, NULL, 'k' }, 480 { "offset", required_argument, NULL, 'o' }, 481 { "read-only", no_argument, NULL, 'r' }, 482 { "partition", required_argument, NULL, 'P' }, 483 { "connect", required_argument, NULL, 'c' }, 484 { "disconnect", no_argument, NULL, 'd' }, 485 { "snapshot", no_argument, NULL, 's' }, 486 { "load-snapshot", required_argument, NULL, 'l' }, 487 { "nocache", no_argument, NULL, 'n' }, 488 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 489 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 490 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 491 { "detect-zeroes", required_argument, NULL, 492 QEMU_NBD_OPT_DETECT_ZEROES }, 493 { "shared", required_argument, NULL, 'e' }, 494 { "format", required_argument, NULL, 'f' }, 495 { "persistent", no_argument, NULL, 't' }, 496 { "verbose", no_argument, NULL, 'v' }, 497 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 498 { "export-name", required_argument, NULL, 'x' }, 499 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 500 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 501 { NULL, 0, NULL, 0 } 502 }; 503 int ch; 504 int opt_ind = 0; 505 char *end; 506 int flags = BDRV_O_RDWR; 507 int partition = -1; 508 int ret = 0; 509 bool seen_cache = false; 510 bool seen_discard = false; 511 bool seen_aio = false; 512 pthread_t client_thread; 513 const char *fmt = NULL; 514 Error *local_err = NULL; 515 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 516 QDict *options = NULL; 517 const char *export_name = NULL; 518 const char *tlscredsid = NULL; 519 bool imageOpts = false; 520 bool writethrough = true; 521 522 /* The client thread uses SIGTERM to interrupt the server. A signal 523 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 524 */ 525 struct sigaction sa_sigterm; 526 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 527 sa_sigterm.sa_handler = termsig_handler; 528 sigaction(SIGTERM, &sa_sigterm, NULL); 529 530 qcrypto_init(&error_fatal); 531 532 module_call_init(MODULE_INIT_QOM); 533 qemu_add_opts(&qemu_object_opts); 534 qemu_init_exec_dir(argv[0]); 535 536 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 537 switch (ch) { 538 case 's': 539 flags |= BDRV_O_SNAPSHOT; 540 break; 541 case 'n': 542 optarg = (char *) "none"; 543 /* fallthrough */ 544 case QEMU_NBD_OPT_CACHE: 545 if (seen_cache) { 546 error_report("-n and --cache can only be specified once"); 547 exit(EXIT_FAILURE); 548 } 549 seen_cache = true; 550 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { 551 error_report("Invalid cache mode `%s'", optarg); 552 exit(EXIT_FAILURE); 553 } 554 break; 555 case QEMU_NBD_OPT_AIO: 556 if (seen_aio) { 557 error_report("--aio can only be specified once"); 558 exit(EXIT_FAILURE); 559 } 560 seen_aio = true; 561 if (!strcmp(optarg, "native")) { 562 flags |= BDRV_O_NATIVE_AIO; 563 } else if (!strcmp(optarg, "threads")) { 564 /* this is the default */ 565 } else { 566 error_report("invalid aio mode `%s'", optarg); 567 exit(EXIT_FAILURE); 568 } 569 break; 570 case QEMU_NBD_OPT_DISCARD: 571 if (seen_discard) { 572 error_report("--discard can only be specified once"); 573 exit(EXIT_FAILURE); 574 } 575 seen_discard = true; 576 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 577 error_report("Invalid discard mode `%s'", optarg); 578 exit(EXIT_FAILURE); 579 } 580 break; 581 case QEMU_NBD_OPT_DETECT_ZEROES: 582 detect_zeroes = 583 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 584 optarg, 585 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 586 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 587 &local_err); 588 if (local_err) { 589 error_reportf_err(local_err, 590 "Failed to parse detect_zeroes mode: "); 591 exit(EXIT_FAILURE); 592 } 593 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 594 !(flags & BDRV_O_UNMAP)) { 595 error_report("setting detect-zeroes to unmap is not allowed " 596 "without setting discard operation to unmap"); 597 exit(EXIT_FAILURE); 598 } 599 break; 600 case 'b': 601 bindto = optarg; 602 break; 603 case 'p': 604 port = optarg; 605 break; 606 case 'o': 607 dev_offset = strtoll (optarg, &end, 0); 608 if (*end) { 609 error_report("Invalid offset `%s'", optarg); 610 exit(EXIT_FAILURE); 611 } 612 if (dev_offset < 0) { 613 error_report("Offset must be positive `%s'", optarg); 614 exit(EXIT_FAILURE); 615 } 616 break; 617 case 'l': 618 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 619 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 620 optarg, false); 621 if (!sn_opts) { 622 error_report("Failed in parsing snapshot param `%s'", 623 optarg); 624 exit(EXIT_FAILURE); 625 } 626 } else { 627 sn_id_or_name = optarg; 628 } 629 /* fall through */ 630 case 'r': 631 nbdflags |= NBD_FLAG_READ_ONLY; 632 flags &= ~BDRV_O_RDWR; 633 break; 634 case 'P': 635 partition = strtol(optarg, &end, 0); 636 if (*end) { 637 error_report("Invalid partition `%s'", optarg); 638 exit(EXIT_FAILURE); 639 } 640 if (partition < 1 || partition > 8) { 641 error_report("Invalid partition %d", partition); 642 exit(EXIT_FAILURE); 643 } 644 break; 645 case 'k': 646 sockpath = optarg; 647 if (sockpath[0] != '/') { 648 error_report("socket path must be absolute"); 649 exit(EXIT_FAILURE); 650 } 651 break; 652 case 'd': 653 disconnect = true; 654 break; 655 case 'c': 656 device = optarg; 657 break; 658 case 'e': 659 shared = strtol(optarg, &end, 0); 660 if (*end) { 661 error_report("Invalid shared device number '%s'", optarg); 662 exit(EXIT_FAILURE); 663 } 664 if (shared < 1) { 665 error_report("Shared device number must be greater than 0"); 666 exit(EXIT_FAILURE); 667 } 668 break; 669 case 'f': 670 fmt = optarg; 671 break; 672 case 't': 673 persistent = 1; 674 break; 675 case 'x': 676 export_name = optarg; 677 break; 678 case 'v': 679 verbose = 1; 680 break; 681 case 'V': 682 version(argv[0]); 683 exit(0); 684 break; 685 case 'h': 686 usage(argv[0]); 687 exit(0); 688 break; 689 case '?': 690 error_report("Try `%s --help' for more information.", argv[0]); 691 exit(EXIT_FAILURE); 692 case QEMU_NBD_OPT_OBJECT: { 693 QemuOpts *opts; 694 opts = qemu_opts_parse_noisily(&qemu_object_opts, 695 optarg, true); 696 if (!opts) { 697 exit(EXIT_FAILURE); 698 } 699 } break; 700 case QEMU_NBD_OPT_TLSCREDS: 701 tlscredsid = optarg; 702 break; 703 case QEMU_NBD_OPT_IMAGE_OPTS: 704 imageOpts = true; 705 break; 706 } 707 } 708 709 if ((argc - optind) != 1) { 710 error_report("Invalid number of arguments"); 711 error_printf("Try `%s --help' for more information.\n", argv[0]); 712 exit(EXIT_FAILURE); 713 } 714 715 if (qemu_opts_foreach(&qemu_object_opts, 716 user_creatable_add_opts_foreach, 717 NULL, NULL)) { 718 exit(EXIT_FAILURE); 719 } 720 721 if (tlscredsid) { 722 if (sockpath) { 723 error_report("TLS is only supported with IPv4/IPv6"); 724 exit(EXIT_FAILURE); 725 } 726 if (device) { 727 error_report("TLS is not supported with a host device"); 728 exit(EXIT_FAILURE); 729 } 730 if (!export_name) { 731 /* Set the default NBD protocol export name, since 732 * we *must* use new style protocol for TLS */ 733 export_name = ""; 734 } 735 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 736 if (local_err) { 737 error_report("Failed to get TLS creds %s", 738 error_get_pretty(local_err)); 739 exit(EXIT_FAILURE); 740 } 741 } 742 743 if (disconnect) { 744 int nbdfd = open(argv[optind], O_RDWR); 745 if (nbdfd < 0) { 746 error_report("Cannot open %s: %s", argv[optind], 747 strerror(errno)); 748 exit(EXIT_FAILURE); 749 } 750 nbd_disconnect(nbdfd); 751 752 close(nbdfd); 753 754 printf("%s disconnected\n", argv[optind]); 755 756 return 0; 757 } 758 759 if (device && !verbose) { 760 int stderr_fd[2]; 761 pid_t pid; 762 int ret; 763 764 if (qemu_pipe(stderr_fd) < 0) { 765 error_report("Error setting up communication pipe: %s", 766 strerror(errno)); 767 exit(EXIT_FAILURE); 768 } 769 770 /* Now daemonize, but keep a communication channel open to 771 * print errors and exit with the proper status code. 772 */ 773 pid = fork(); 774 if (pid < 0) { 775 error_report("Failed to fork: %s", strerror(errno)); 776 exit(EXIT_FAILURE); 777 } else if (pid == 0) { 778 close(stderr_fd[0]); 779 ret = qemu_daemon(1, 0); 780 781 /* Temporarily redirect stderr to the parent's pipe... */ 782 dup2(stderr_fd[1], STDERR_FILENO); 783 if (ret < 0) { 784 error_report("Failed to daemonize: %s", strerror(errno)); 785 exit(EXIT_FAILURE); 786 } 787 788 /* ... close the descriptor we inherited and go on. */ 789 close(stderr_fd[1]); 790 } else { 791 bool errors = false; 792 char *buf; 793 794 /* In the parent. Print error messages from the child until 795 * it closes the pipe. 796 */ 797 close(stderr_fd[1]); 798 buf = g_malloc(1024); 799 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 800 errors = true; 801 ret = qemu_write_full(STDERR_FILENO, buf, ret); 802 if (ret < 0) { 803 exit(EXIT_FAILURE); 804 } 805 } 806 if (ret < 0) { 807 error_report("Cannot read from daemon: %s", 808 strerror(errno)); 809 exit(EXIT_FAILURE); 810 } 811 812 /* Usually the daemon should not print any message. 813 * Exit with zero status in that case. 814 */ 815 exit(errors); 816 } 817 } 818 819 if (device != NULL && sockpath == NULL) { 820 sockpath = g_malloc(128); 821 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 822 } 823 824 saddr = nbd_build_socket_address(sockpath, bindto, port); 825 826 if (qemu_init_main_loop(&local_err)) { 827 error_report_err(local_err); 828 exit(EXIT_FAILURE); 829 } 830 bdrv_init(); 831 atexit(bdrv_close_all); 832 833 srcpath = argv[optind]; 834 if (imageOpts) { 835 QemuOpts *opts; 836 if (fmt) { 837 error_report("--image-opts and -f are mutually exclusive"); 838 exit(EXIT_FAILURE); 839 } 840 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 841 if (!opts) { 842 qemu_opts_reset(&file_opts); 843 exit(EXIT_FAILURE); 844 } 845 options = qemu_opts_to_qdict(opts, NULL); 846 qemu_opts_reset(&file_opts); 847 blk = blk_new_open(NULL, NULL, options, flags, &local_err); 848 } else { 849 if (fmt) { 850 options = qdict_new(); 851 qdict_put(options, "driver", qstring_from_str(fmt)); 852 } 853 blk = blk_new_open(srcpath, NULL, options, flags, &local_err); 854 } 855 856 if (!blk) { 857 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 858 argv[optind]); 859 exit(EXIT_FAILURE); 860 } 861 bs = blk_bs(blk); 862 863 blk_set_enable_write_cache(blk, !writethrough); 864 865 if (sn_opts) { 866 ret = bdrv_snapshot_load_tmp(bs, 867 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 868 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 869 &local_err); 870 } else if (sn_id_or_name) { 871 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 872 &local_err); 873 } 874 if (ret < 0) { 875 error_reportf_err(local_err, "Failed to load snapshot: "); 876 exit(EXIT_FAILURE); 877 } 878 879 bs->detect_zeroes = detect_zeroes; 880 fd_size = blk_getlength(blk); 881 if (fd_size < 0) { 882 error_report("Failed to determine the image length: %s", 883 strerror(-fd_size)); 884 exit(EXIT_FAILURE); 885 } 886 887 if (partition != -1) { 888 ret = find_partition(blk, partition, &dev_offset, &fd_size); 889 if (ret < 0) { 890 error_report("Could not find partition %d: %s", partition, 891 strerror(-ret)); 892 exit(EXIT_FAILURE); 893 } 894 } 895 896 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 897 &local_err); 898 if (!exp) { 899 error_report_err(local_err); 900 exit(EXIT_FAILURE); 901 } 902 if (export_name) { 903 nbd_export_set_name(exp, export_name); 904 newproto = true; 905 } 906 907 server_ioc = qio_channel_socket_new(); 908 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 909 object_unref(OBJECT(server_ioc)); 910 error_report_err(local_err); 911 return 1; 912 } 913 914 if (device) { 915 int ret; 916 917 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 918 if (ret != 0) { 919 error_report("Failed to create client thread: %s", strerror(ret)); 920 exit(EXIT_FAILURE); 921 } 922 } else { 923 /* Shut up GCC warnings. */ 924 memset(&client_thread, 0, sizeof(client_thread)); 925 } 926 927 nbd_update_server_watch(); 928 929 /* now when the initialization is (almost) complete, chdir("/") 930 * to free any busy filesystems */ 931 if (chdir("/") < 0) { 932 error_report("Could not chdir to root directory: %s", 933 strerror(errno)); 934 exit(EXIT_FAILURE); 935 } 936 937 state = RUNNING; 938 do { 939 main_loop_wait(false); 940 if (state == TERMINATE) { 941 state = TERMINATING; 942 nbd_export_close(exp); 943 nbd_export_put(exp); 944 exp = NULL; 945 } 946 } while (state != TERMINATED); 947 948 blk_unref(blk); 949 if (sockpath) { 950 unlink(sockpath); 951 } 952 953 qemu_opts_del(sn_opts); 954 955 if (device) { 956 void *ret; 957 pthread_join(client_thread, &ret); 958 exit(ret != NULL); 959 } else { 960 exit(EXIT_SUCCESS); 961 } 962 } 963