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 "qemu-common.h" 21 #include "sysemu/block-backend.h" 22 #include "block/block_int.h" 23 #include "block/nbd.h" 24 #include "qemu/main-loop.h" 25 #include "qemu/error-report.h" 26 #include "qemu/config-file.h" 27 #include "block/snapshot.h" 28 #include "qapi/util.h" 29 #include "qapi/qmp/qstring.h" 30 #include "qom/object_interfaces.h" 31 #include "io/channel-socket.h" 32 33 #include <getopt.h> 34 #include <libgen.h> 35 #include <pthread.h> 36 37 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 38 #define QEMU_NBD_OPT_CACHE 256 39 #define QEMU_NBD_OPT_AIO 257 40 #define QEMU_NBD_OPT_DISCARD 258 41 #define QEMU_NBD_OPT_DETECT_ZEROES 259 42 #define QEMU_NBD_OPT_OBJECT 260 43 #define QEMU_NBD_OPT_TLSCREDS 261 44 #define QEMU_NBD_OPT_IMAGE_OPTS 262 45 46 static NBDExport *exp; 47 static bool newproto; 48 static int verbose; 49 static char *srcpath; 50 static SocketAddress *saddr; 51 static int persistent = 0; 52 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 53 static int shared = 1; 54 static int nb_fds; 55 static QIOChannelSocket *server_ioc; 56 static int server_watch = -1; 57 static QCryptoTLSCreds *tlscreds; 58 59 static void usage(const char *name) 60 { 61 (printf) ( 62 "Usage: %s [OPTIONS] FILE\n" 63 "QEMU Disk Network Block Device Server\n" 64 "\n" 65 " -h, --help display this help and exit\n" 66 " -V, --version output version information and exit\n" 67 "\n" 68 "Connection properties:\n" 69 " -p, --port=PORT port to listen on (default `%d')\n" 70 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 71 " -k, --socket=PATH path to the unix socket\n" 72 " (default '"SOCKET_PATH"')\n" 73 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 74 " -t, --persistent don't exit on the last connection\n" 75 " -v, --verbose display extra debugging information\n" 76 "\n" 77 "Exposing part of the image:\n" 78 " -o, --offset=OFFSET offset into the image\n" 79 " -P, --partition=NUM only expose partition NUM\n" 80 "\n" 81 "General purpose options:\n" 82 " --object type,id=ID,... define an object such as 'secret' for providing\n" 83 " passwords and/or encryption keys\n" 84 #ifdef __linux__ 85 "Kernel NBD client support:\n" 86 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 87 " -d, --disconnect disconnect the specified device\n" 88 "\n" 89 #endif 90 "\n" 91 "Block device options:\n" 92 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 93 " -r, --read-only export read-only\n" 94 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 95 " file with backing_file=FILE, redirect the write to\n" 96 " the temporary one\n" 97 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 98 " load an internal snapshot inside FILE and export it\n" 99 " as an read-only device, SNAPSHOT_PARAM format is\n" 100 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 101 " '[ID_OR_NAME]'\n" 102 " -n, --nocache disable host cache\n" 103 " --cache=MODE set cache mode (none, writeback, ...)\n" 104 " --aio=MODE set AIO mode (native or threads)\n" 105 " --discard=MODE set discard mode (ignore, unmap)\n" 106 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 107 " --image-opts treat FILE as a full set of image options\n" 108 "\n" 109 "Report bugs to <qemu-devel@nongnu.org>\n" 110 , name, NBD_DEFAULT_PORT, "DEVICE"); 111 } 112 113 static void version(const char *name) 114 { 115 printf( 116 "%s version 0.0.1\n" 117 "Written by Anthony Liguori.\n" 118 "\n" 119 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 120 "This is free software; see the source for copying conditions. There is NO\n" 121 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 122 , name); 123 } 124 125 struct partition_record 126 { 127 uint8_t bootable; 128 uint8_t start_head; 129 uint32_t start_cylinder; 130 uint8_t start_sector; 131 uint8_t system; 132 uint8_t end_head; 133 uint8_t end_cylinder; 134 uint8_t end_sector; 135 uint32_t start_sector_abs; 136 uint32_t nb_sectors_abs; 137 }; 138 139 static void read_partition(uint8_t *p, struct partition_record *r) 140 { 141 r->bootable = p[0]; 142 r->start_head = p[1]; 143 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 144 r->start_sector = p[2] & 0x3f; 145 r->system = p[4]; 146 r->end_head = p[5]; 147 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 148 r->end_sector = p[6] & 0x3f; 149 150 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 151 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 152 } 153 154 static int find_partition(BlockBackend *blk, int partition, 155 off_t *offset, off_t *size) 156 { 157 struct partition_record mbr[4]; 158 uint8_t data[512]; 159 int i; 160 int ext_partnum = 4; 161 int ret; 162 163 if ((ret = blk_read(blk, 0, data, 1)) < 0) { 164 error_report("error while reading: %s", strerror(-ret)); 165 exit(EXIT_FAILURE); 166 } 167 168 if (data[510] != 0x55 || data[511] != 0xaa) { 169 return -EINVAL; 170 } 171 172 for (i = 0; i < 4; i++) { 173 read_partition(&data[446 + 16 * i], &mbr[i]); 174 175 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 176 continue; 177 } 178 179 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 180 struct partition_record ext[4]; 181 uint8_t data1[512]; 182 int j; 183 184 if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 185 error_report("error while reading: %s", strerror(-ret)); 186 exit(EXIT_FAILURE); 187 } 188 189 for (j = 0; j < 4; j++) { 190 read_partition(&data1[446 + 16 * j], &ext[j]); 191 if (!ext[j].system || !ext[j].nb_sectors_abs) { 192 continue; 193 } 194 195 if ((ext_partnum + j + 1) == partition) { 196 *offset = (uint64_t)ext[j].start_sector_abs << 9; 197 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 198 return 0; 199 } 200 } 201 ext_partnum += 4; 202 } else if ((i + 1) == partition) { 203 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 204 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 205 return 0; 206 } 207 } 208 209 return -ENOENT; 210 } 211 212 static void termsig_handler(int signum) 213 { 214 state = TERMINATE; 215 qemu_notify_event(); 216 } 217 218 219 static void *show_parts(void *arg) 220 { 221 char *device = arg; 222 int nbd; 223 224 /* linux just needs an open() to trigger 225 * the partition table update 226 * but remember to load the module with max_part != 0 : 227 * modprobe nbd max_part=63 228 */ 229 nbd = open(device, O_RDWR); 230 if (nbd >= 0) { 231 close(nbd); 232 } 233 return NULL; 234 } 235 236 static void *nbd_client_thread(void *arg) 237 { 238 char *device = arg; 239 off_t size; 240 uint32_t nbdflags; 241 QIOChannelSocket *sioc; 242 int fd; 243 int ret; 244 pthread_t show_parts_thread; 245 Error *local_error = NULL; 246 247 sioc = qio_channel_socket_new(); 248 if (qio_channel_socket_connect_sync(sioc, 249 saddr, 250 &local_error) < 0) { 251 error_report_err(local_error); 252 goto out; 253 } 254 255 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, 256 NULL, NULL, NULL, 257 &size, &local_error); 258 if (ret < 0) { 259 if (local_error) { 260 error_report_err(local_error); 261 } 262 goto out_socket; 263 } 264 265 fd = open(device, O_RDWR); 266 if (fd < 0) { 267 /* Linux-only, we can use %m in printf. */ 268 error_report("Failed to open %s: %m", device); 269 goto out_socket; 270 } 271 272 ret = nbd_init(fd, sioc, nbdflags, size); 273 if (ret < 0) { 274 goto out_fd; 275 } 276 277 /* update partition table */ 278 pthread_create(&show_parts_thread, NULL, show_parts, device); 279 280 if (verbose) { 281 fprintf(stderr, "NBD device %s is now connected to %s\n", 282 device, srcpath); 283 } else { 284 /* Close stderr so that the qemu-nbd process exits. */ 285 dup2(STDOUT_FILENO, STDERR_FILENO); 286 } 287 288 ret = nbd_client(fd); 289 if (ret) { 290 goto out_fd; 291 } 292 close(fd); 293 object_unref(OBJECT(sioc)); 294 kill(getpid(), SIGTERM); 295 return (void *) EXIT_SUCCESS; 296 297 out_fd: 298 close(fd); 299 out_socket: 300 object_unref(OBJECT(sioc)); 301 out: 302 kill(getpid(), SIGTERM); 303 return (void *) EXIT_FAILURE; 304 } 305 306 static int nbd_can_accept(void) 307 { 308 return nb_fds < shared; 309 } 310 311 static void nbd_export_closed(NBDExport *exp) 312 { 313 assert(state == TERMINATING); 314 state = TERMINATED; 315 } 316 317 static void nbd_update_server_watch(void); 318 319 static void nbd_client_closed(NBDClient *client) 320 { 321 nb_fds--; 322 if (nb_fds == 0 && !persistent && state == RUNNING) { 323 state = TERMINATE; 324 } 325 nbd_update_server_watch(); 326 nbd_client_put(client); 327 } 328 329 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 330 { 331 QIOChannelSocket *cioc; 332 333 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 334 NULL); 335 if (!cioc) { 336 return TRUE; 337 } 338 339 if (state >= TERMINATE) { 340 object_unref(OBJECT(cioc)); 341 return TRUE; 342 } 343 344 nb_fds++; 345 nbd_update_server_watch(); 346 nbd_client_new(newproto ? NULL : exp, cioc, 347 tlscreds, NULL, nbd_client_closed); 348 object_unref(OBJECT(cioc)); 349 350 return TRUE; 351 } 352 353 static void nbd_update_server_watch(void) 354 { 355 if (nbd_can_accept()) { 356 if (server_watch == -1) { 357 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 358 G_IO_IN, 359 nbd_accept, 360 NULL, NULL); 361 } 362 } else { 363 if (server_watch != -1) { 364 g_source_remove(server_watch); 365 server_watch = -1; 366 } 367 } 368 } 369 370 371 static SocketAddress *nbd_build_socket_address(const char *sockpath, 372 const char *bindto, 373 const char *port) 374 { 375 SocketAddress *saddr; 376 377 saddr = g_new0(SocketAddress, 1); 378 if (sockpath) { 379 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 380 saddr->u.q_unix = g_new0(UnixSocketAddress, 1); 381 saddr->u.q_unix->path = g_strdup(sockpath); 382 } else { 383 saddr->type = SOCKET_ADDRESS_KIND_INET; 384 saddr->u.inet = g_new0(InetSocketAddress, 1); 385 saddr->u.inet->host = g_strdup(bindto); 386 if (port) { 387 saddr->u.inet->port = g_strdup(port); 388 } else { 389 saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 390 } 391 } 392 393 return saddr; 394 } 395 396 397 static QemuOptsList file_opts = { 398 .name = "file", 399 .implied_opt_name = "file", 400 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 401 .desc = { 402 /* no elements => accept any params */ 403 { /* end of list */ } 404 }, 405 }; 406 407 static QemuOptsList qemu_object_opts = { 408 .name = "object", 409 .implied_opt_name = "qom-type", 410 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 411 .desc = { 412 { } 413 }, 414 }; 415 416 417 418 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 419 { 420 Object *obj; 421 QCryptoTLSCreds *creds; 422 423 obj = object_resolve_path_component( 424 object_get_objects_root(), id); 425 if (!obj) { 426 error_setg(errp, "No TLS credentials with id '%s'", 427 id); 428 return NULL; 429 } 430 creds = (QCryptoTLSCreds *) 431 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 432 if (!creds) { 433 error_setg(errp, "Object with id '%s' is not TLS credentials", 434 id); 435 return NULL; 436 } 437 438 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 439 error_setg(errp, 440 "Expecting TLS credentials with a server endpoint"); 441 return NULL; 442 } 443 object_ref(obj); 444 return creds; 445 } 446 447 448 int main(int argc, char **argv) 449 { 450 BlockBackend *blk; 451 BlockDriverState *bs; 452 off_t dev_offset = 0; 453 uint32_t nbdflags = 0; 454 bool disconnect = false; 455 const char *bindto = "0.0.0.0"; 456 const char *port = NULL; 457 char *sockpath = NULL; 458 char *device = NULL; 459 off_t fd_size; 460 QemuOpts *sn_opts = NULL; 461 const char *sn_id_or_name = NULL; 462 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; 463 struct option lopt[] = { 464 { "help", no_argument, NULL, 'h' }, 465 { "version", no_argument, NULL, 'V' }, 466 { "bind", required_argument, NULL, 'b' }, 467 { "port", required_argument, NULL, 'p' }, 468 { "socket", required_argument, NULL, 'k' }, 469 { "offset", required_argument, NULL, 'o' }, 470 { "read-only", no_argument, NULL, 'r' }, 471 { "partition", required_argument, NULL, 'P' }, 472 { "connect", required_argument, NULL, 'c' }, 473 { "disconnect", no_argument, NULL, 'd' }, 474 { "snapshot", no_argument, NULL, 's' }, 475 { "load-snapshot", required_argument, NULL, 'l' }, 476 { "nocache", no_argument, NULL, 'n' }, 477 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 478 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 479 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 480 { "detect-zeroes", required_argument, NULL, 481 QEMU_NBD_OPT_DETECT_ZEROES }, 482 { "shared", required_argument, NULL, 'e' }, 483 { "format", required_argument, NULL, 'f' }, 484 { "persistent", no_argument, NULL, 't' }, 485 { "verbose", no_argument, NULL, 'v' }, 486 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 487 { "export-name", required_argument, NULL, 'x' }, 488 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 489 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 490 { NULL, 0, NULL, 0 } 491 }; 492 int ch; 493 int opt_ind = 0; 494 char *end; 495 int flags = BDRV_O_RDWR; 496 int partition = -1; 497 int ret = 0; 498 bool seen_cache = false; 499 bool seen_discard = false; 500 bool seen_aio = false; 501 pthread_t client_thread; 502 const char *fmt = NULL; 503 Error *local_err = NULL; 504 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 505 QDict *options = NULL; 506 const char *export_name = NULL; 507 const char *tlscredsid = NULL; 508 bool imageOpts = false; 509 510 /* The client thread uses SIGTERM to interrupt the server. A signal 511 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 512 */ 513 struct sigaction sa_sigterm; 514 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 515 sa_sigterm.sa_handler = termsig_handler; 516 sigaction(SIGTERM, &sa_sigterm, NULL); 517 module_call_init(MODULE_INIT_QOM); 518 qemu_add_opts(&qemu_object_opts); 519 qemu_init_exec_dir(argv[0]); 520 521 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 522 switch (ch) { 523 case 's': 524 flags |= BDRV_O_SNAPSHOT; 525 break; 526 case 'n': 527 optarg = (char *) "none"; 528 /* fallthrough */ 529 case QEMU_NBD_OPT_CACHE: 530 if (seen_cache) { 531 error_report("-n and --cache can only be specified once"); 532 exit(EXIT_FAILURE); 533 } 534 seen_cache = true; 535 if (bdrv_parse_cache_flags(optarg, &flags) == -1) { 536 error_report("Invalid cache mode `%s'", optarg); 537 exit(EXIT_FAILURE); 538 } 539 break; 540 case QEMU_NBD_OPT_AIO: 541 if (seen_aio) { 542 error_report("--aio can only be specified once"); 543 exit(EXIT_FAILURE); 544 } 545 seen_aio = true; 546 if (!strcmp(optarg, "native")) { 547 flags |= BDRV_O_NATIVE_AIO; 548 } else if (!strcmp(optarg, "threads")) { 549 /* this is the default */ 550 } else { 551 error_report("invalid aio mode `%s'", optarg); 552 exit(EXIT_FAILURE); 553 } 554 break; 555 case QEMU_NBD_OPT_DISCARD: 556 if (seen_discard) { 557 error_report("--discard can only be specified once"); 558 exit(EXIT_FAILURE); 559 } 560 seen_discard = true; 561 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 562 error_report("Invalid discard mode `%s'", optarg); 563 exit(EXIT_FAILURE); 564 } 565 break; 566 case QEMU_NBD_OPT_DETECT_ZEROES: 567 detect_zeroes = 568 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 569 optarg, 570 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 571 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 572 &local_err); 573 if (local_err) { 574 error_reportf_err(local_err, 575 "Failed to parse detect_zeroes mode: "); 576 exit(EXIT_FAILURE); 577 } 578 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 579 !(flags & BDRV_O_UNMAP)) { 580 error_report("setting detect-zeroes to unmap is not allowed " 581 "without setting discard operation to unmap"); 582 exit(EXIT_FAILURE); 583 } 584 break; 585 case 'b': 586 bindto = optarg; 587 break; 588 case 'p': 589 port = optarg; 590 break; 591 case 'o': 592 dev_offset = strtoll (optarg, &end, 0); 593 if (*end) { 594 error_report("Invalid offset `%s'", optarg); 595 exit(EXIT_FAILURE); 596 } 597 if (dev_offset < 0) { 598 error_report("Offset must be positive `%s'", optarg); 599 exit(EXIT_FAILURE); 600 } 601 break; 602 case 'l': 603 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 604 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 605 optarg, false); 606 if (!sn_opts) { 607 error_report("Failed in parsing snapshot param `%s'", 608 optarg); 609 exit(EXIT_FAILURE); 610 } 611 } else { 612 sn_id_or_name = optarg; 613 } 614 /* fall through */ 615 case 'r': 616 nbdflags |= NBD_FLAG_READ_ONLY; 617 flags &= ~BDRV_O_RDWR; 618 break; 619 case 'P': 620 partition = strtol(optarg, &end, 0); 621 if (*end) { 622 error_report("Invalid partition `%s'", optarg); 623 exit(EXIT_FAILURE); 624 } 625 if (partition < 1 || partition > 8) { 626 error_report("Invalid partition %d", partition); 627 exit(EXIT_FAILURE); 628 } 629 break; 630 case 'k': 631 sockpath = optarg; 632 if (sockpath[0] != '/') { 633 error_report("socket path must be absolute"); 634 exit(EXIT_FAILURE); 635 } 636 break; 637 case 'd': 638 disconnect = true; 639 break; 640 case 'c': 641 device = optarg; 642 break; 643 case 'e': 644 shared = strtol(optarg, &end, 0); 645 if (*end) { 646 error_report("Invalid shared device number '%s'", optarg); 647 exit(EXIT_FAILURE); 648 } 649 if (shared < 1) { 650 error_report("Shared device number must be greater than 0"); 651 exit(EXIT_FAILURE); 652 } 653 break; 654 case 'f': 655 fmt = optarg; 656 break; 657 case 't': 658 persistent = 1; 659 break; 660 case 'x': 661 export_name = optarg; 662 break; 663 case 'v': 664 verbose = 1; 665 break; 666 case 'V': 667 version(argv[0]); 668 exit(0); 669 break; 670 case 'h': 671 usage(argv[0]); 672 exit(0); 673 break; 674 case '?': 675 error_report("Try `%s --help' for more information.", argv[0]); 676 exit(EXIT_FAILURE); 677 case QEMU_NBD_OPT_OBJECT: { 678 QemuOpts *opts; 679 opts = qemu_opts_parse_noisily(&qemu_object_opts, 680 optarg, true); 681 if (!opts) { 682 exit(EXIT_FAILURE); 683 } 684 } break; 685 case QEMU_NBD_OPT_TLSCREDS: 686 tlscredsid = optarg; 687 break; 688 case QEMU_NBD_OPT_IMAGE_OPTS: 689 imageOpts = true; 690 break; 691 } 692 } 693 694 if ((argc - optind) != 1) { 695 error_report("Invalid number of arguments"); 696 error_printf("Try `%s --help' for more information.\n", argv[0]); 697 exit(EXIT_FAILURE); 698 } 699 700 if (qemu_opts_foreach(&qemu_object_opts, 701 user_creatable_add_opts_foreach, 702 NULL, &local_err)) { 703 error_report_err(local_err); 704 exit(EXIT_FAILURE); 705 } 706 707 if (tlscredsid) { 708 if (sockpath) { 709 error_report("TLS is only supported with IPv4/IPv6"); 710 exit(EXIT_FAILURE); 711 } 712 if (device) { 713 error_report("TLS is not supported with a host device"); 714 exit(EXIT_FAILURE); 715 } 716 if (!export_name) { 717 /* Set the default NBD protocol export name, since 718 * we *must* use new style protocol for TLS */ 719 export_name = ""; 720 } 721 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 722 if (local_err) { 723 error_report("Failed to get TLS creds %s", 724 error_get_pretty(local_err)); 725 exit(EXIT_FAILURE); 726 } 727 } 728 729 if (disconnect) { 730 int nbdfd = open(argv[optind], O_RDWR); 731 if (nbdfd < 0) { 732 error_report("Cannot open %s: %s", argv[optind], 733 strerror(errno)); 734 exit(EXIT_FAILURE); 735 } 736 nbd_disconnect(nbdfd); 737 738 close(nbdfd); 739 740 printf("%s disconnected\n", argv[optind]); 741 742 return 0; 743 } 744 745 if (device && !verbose) { 746 int stderr_fd[2]; 747 pid_t pid; 748 int ret; 749 750 if (qemu_pipe(stderr_fd) < 0) { 751 error_report("Error setting up communication pipe: %s", 752 strerror(errno)); 753 exit(EXIT_FAILURE); 754 } 755 756 /* Now daemonize, but keep a communication channel open to 757 * print errors and exit with the proper status code. 758 */ 759 pid = fork(); 760 if (pid < 0) { 761 error_report("Failed to fork: %s", strerror(errno)); 762 exit(EXIT_FAILURE); 763 } else if (pid == 0) { 764 close(stderr_fd[0]); 765 ret = qemu_daemon(1, 0); 766 767 /* Temporarily redirect stderr to the parent's pipe... */ 768 dup2(stderr_fd[1], STDERR_FILENO); 769 if (ret < 0) { 770 error_report("Failed to daemonize: %s", strerror(errno)); 771 exit(EXIT_FAILURE); 772 } 773 774 /* ... close the descriptor we inherited and go on. */ 775 close(stderr_fd[1]); 776 } else { 777 bool errors = false; 778 char *buf; 779 780 /* In the parent. Print error messages from the child until 781 * it closes the pipe. 782 */ 783 close(stderr_fd[1]); 784 buf = g_malloc(1024); 785 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 786 errors = true; 787 ret = qemu_write_full(STDERR_FILENO, buf, ret); 788 if (ret < 0) { 789 exit(EXIT_FAILURE); 790 } 791 } 792 if (ret < 0) { 793 error_report("Cannot read from daemon: %s", 794 strerror(errno)); 795 exit(EXIT_FAILURE); 796 } 797 798 /* Usually the daemon should not print any message. 799 * Exit with zero status in that case. 800 */ 801 exit(errors); 802 } 803 } 804 805 if (device != NULL && sockpath == NULL) { 806 sockpath = g_malloc(128); 807 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 808 } 809 810 saddr = nbd_build_socket_address(sockpath, bindto, port); 811 812 if (qemu_init_main_loop(&local_err)) { 813 error_report_err(local_err); 814 exit(EXIT_FAILURE); 815 } 816 bdrv_init(); 817 atexit(bdrv_close_all); 818 819 srcpath = argv[optind]; 820 if (imageOpts) { 821 QemuOpts *opts; 822 if (fmt) { 823 error_report("--image-opts and -f are mutually exclusive"); 824 exit(EXIT_FAILURE); 825 } 826 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 827 if (!opts) { 828 qemu_opts_reset(&file_opts); 829 exit(EXIT_FAILURE); 830 } 831 options = qemu_opts_to_qdict(opts, NULL); 832 qemu_opts_reset(&file_opts); 833 blk = blk_new_open("hda", NULL, NULL, options, flags, &local_err); 834 } else { 835 if (fmt) { 836 options = qdict_new(); 837 qdict_put(options, "driver", qstring_from_str(fmt)); 838 } 839 blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err); 840 } 841 842 if (!blk) { 843 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 844 argv[optind]); 845 exit(EXIT_FAILURE); 846 } 847 bs = blk_bs(blk); 848 849 if (sn_opts) { 850 ret = bdrv_snapshot_load_tmp(bs, 851 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 852 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 853 &local_err); 854 } else if (sn_id_or_name) { 855 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 856 &local_err); 857 } 858 if (ret < 0) { 859 error_reportf_err(local_err, "Failed to load snapshot: "); 860 exit(EXIT_FAILURE); 861 } 862 863 bs->detect_zeroes = detect_zeroes; 864 fd_size = blk_getlength(blk); 865 if (fd_size < 0) { 866 error_report("Failed to determine the image length: %s", 867 strerror(-fd_size)); 868 exit(EXIT_FAILURE); 869 } 870 871 if (partition != -1) { 872 ret = find_partition(blk, partition, &dev_offset, &fd_size); 873 if (ret < 0) { 874 error_report("Could not find partition %d: %s", partition, 875 strerror(-ret)); 876 exit(EXIT_FAILURE); 877 } 878 } 879 880 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 881 &local_err); 882 if (!exp) { 883 error_report_err(local_err); 884 exit(EXIT_FAILURE); 885 } 886 if (export_name) { 887 nbd_export_set_name(exp, export_name); 888 newproto = true; 889 } 890 891 server_ioc = qio_channel_socket_new(); 892 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 893 object_unref(OBJECT(server_ioc)); 894 error_report_err(local_err); 895 return 1; 896 } 897 898 if (device) { 899 int ret; 900 901 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 902 if (ret != 0) { 903 error_report("Failed to create client thread: %s", strerror(ret)); 904 exit(EXIT_FAILURE); 905 } 906 } else { 907 /* Shut up GCC warnings. */ 908 memset(&client_thread, 0, sizeof(client_thread)); 909 } 910 911 nbd_update_server_watch(); 912 913 /* now when the initialization is (almost) complete, chdir("/") 914 * to free any busy filesystems */ 915 if (chdir("/") < 0) { 916 error_report("Could not chdir to root directory: %s", 917 strerror(errno)); 918 exit(EXIT_FAILURE); 919 } 920 921 state = RUNNING; 922 do { 923 main_loop_wait(false); 924 if (state == TERMINATE) { 925 state = TERMINATING; 926 nbd_export_close(exp); 927 nbd_export_put(exp); 928 exp = NULL; 929 } 930 } while (state != TERMINATED); 931 932 blk_unref(blk); 933 if (sockpath) { 934 unlink(sockpath); 935 } 936 937 qemu_opts_del(sn_opts); 938 939 if (device) { 940 void *ret; 941 pthread_join(client_thread, &ret); 942 exit(ret != NULL); 943 } else { 944 exit(EXIT_SUCCESS); 945 } 946 } 947