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 "block/snapshot.h" 30 #include "qapi/util.h" 31 #include "qapi/qmp/qstring.h" 32 #include "qom/object_interfaces.h" 33 #include "io/channel-socket.h" 34 35 #include <getopt.h> 36 #include <libgen.h> 37 #include <pthread.h> 38 39 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 40 #define QEMU_NBD_OPT_CACHE 256 41 #define QEMU_NBD_OPT_AIO 257 42 #define QEMU_NBD_OPT_DISCARD 258 43 #define QEMU_NBD_OPT_DETECT_ZEROES 259 44 #define QEMU_NBD_OPT_OBJECT 260 45 #define QEMU_NBD_OPT_TLSCREDS 261 46 #define QEMU_NBD_OPT_IMAGE_OPTS 262 47 48 static NBDExport *exp; 49 static bool newproto; 50 static int verbose; 51 static char *srcpath; 52 static SocketAddress *saddr; 53 static int persistent = 0; 54 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 55 static int shared = 1; 56 static int nb_fds; 57 static QIOChannelSocket *server_ioc; 58 static int server_watch = -1; 59 static QCryptoTLSCreds *tlscreds; 60 61 static void usage(const char *name) 62 { 63 (printf) ( 64 "Usage: %s [OPTIONS] FILE\n" 65 "QEMU Disk Network Block Device Server\n" 66 "\n" 67 " -h, --help display this help and exit\n" 68 " -V, --version output version information and exit\n" 69 "\n" 70 "Connection properties:\n" 71 " -p, --port=PORT port to listen on (default `%d')\n" 72 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 73 " -k, --socket=PATH path to the unix socket\n" 74 " (default '"SOCKET_PATH"')\n" 75 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 76 " -t, --persistent don't exit on the last connection\n" 77 " -v, --verbose display extra debugging information\n" 78 "\n" 79 "Exposing part of the image:\n" 80 " -o, --offset=OFFSET offset into the image\n" 81 " -P, --partition=NUM only expose partition NUM\n" 82 "\n" 83 "General purpose options:\n" 84 " --object type,id=ID,... define an object such as 'secret' for providing\n" 85 " passwords and/or encryption keys\n" 86 #ifdef __linux__ 87 "Kernel NBD client support:\n" 88 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 89 " -d, --disconnect disconnect the specified device\n" 90 "\n" 91 #endif 92 "\n" 93 "Block device options:\n" 94 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 95 " -r, --read-only export read-only\n" 96 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 97 " file with backing_file=FILE, redirect the write to\n" 98 " the temporary one\n" 99 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 100 " load an internal snapshot inside FILE and export it\n" 101 " as an read-only device, SNAPSHOT_PARAM format is\n" 102 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 103 " '[ID_OR_NAME]'\n" 104 " -n, --nocache disable host cache\n" 105 " --cache=MODE set cache mode (none, writeback, ...)\n" 106 " --aio=MODE set AIO mode (native or threads)\n" 107 " --discard=MODE set discard mode (ignore, unmap)\n" 108 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 109 " --image-opts treat FILE as a full set of image options\n" 110 "\n" 111 "Report bugs to <qemu-devel@nongnu.org>\n" 112 , name, NBD_DEFAULT_PORT, "DEVICE"); 113 } 114 115 static void version(const char *name) 116 { 117 printf( 118 "%s version 0.0.1\n" 119 "Written by Anthony Liguori.\n" 120 "\n" 121 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 122 "This is free software; see the source for copying conditions. There is NO\n" 123 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 124 , name); 125 } 126 127 struct partition_record 128 { 129 uint8_t bootable; 130 uint8_t start_head; 131 uint32_t start_cylinder; 132 uint8_t start_sector; 133 uint8_t system; 134 uint8_t end_head; 135 uint8_t end_cylinder; 136 uint8_t end_sector; 137 uint32_t start_sector_abs; 138 uint32_t nb_sectors_abs; 139 }; 140 141 static void read_partition(uint8_t *p, struct partition_record *r) 142 { 143 r->bootable = p[0]; 144 r->start_head = p[1]; 145 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 146 r->start_sector = p[2] & 0x3f; 147 r->system = p[4]; 148 r->end_head = p[5]; 149 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 150 r->end_sector = p[6] & 0x3f; 151 152 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 153 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 154 } 155 156 static int find_partition(BlockBackend *blk, int partition, 157 off_t *offset, off_t *size) 158 { 159 struct partition_record mbr[4]; 160 uint8_t data[512]; 161 int i; 162 int ext_partnum = 4; 163 int ret; 164 165 if ((ret = blk_read(blk, 0, data, 1)) < 0) { 166 error_report("error while reading: %s", strerror(-ret)); 167 exit(EXIT_FAILURE); 168 } 169 170 if (data[510] != 0x55 || data[511] != 0xaa) { 171 return -EINVAL; 172 } 173 174 for (i = 0; i < 4; i++) { 175 read_partition(&data[446 + 16 * i], &mbr[i]); 176 177 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 178 continue; 179 } 180 181 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 182 struct partition_record ext[4]; 183 uint8_t data1[512]; 184 int j; 185 186 if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) { 187 error_report("error while reading: %s", strerror(-ret)); 188 exit(EXIT_FAILURE); 189 } 190 191 for (j = 0; j < 4; j++) { 192 read_partition(&data1[446 + 16 * j], &ext[j]); 193 if (!ext[j].system || !ext[j].nb_sectors_abs) { 194 continue; 195 } 196 197 if ((ext_partnum + j + 1) == partition) { 198 *offset = (uint64_t)ext[j].start_sector_abs << 9; 199 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 200 return 0; 201 } 202 } 203 ext_partnum += 4; 204 } else if ((i + 1) == partition) { 205 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 206 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 207 return 0; 208 } 209 } 210 211 return -ENOENT; 212 } 213 214 static void termsig_handler(int signum) 215 { 216 state = TERMINATE; 217 qemu_notify_event(); 218 } 219 220 221 static void *show_parts(void *arg) 222 { 223 char *device = arg; 224 int nbd; 225 226 /* linux just needs an open() to trigger 227 * the partition table update 228 * but remember to load the module with max_part != 0 : 229 * modprobe nbd max_part=63 230 */ 231 nbd = open(device, O_RDWR); 232 if (nbd >= 0) { 233 close(nbd); 234 } 235 return NULL; 236 } 237 238 static void *nbd_client_thread(void *arg) 239 { 240 char *device = arg; 241 off_t size; 242 uint32_t nbdflags; 243 QIOChannelSocket *sioc; 244 int fd; 245 int ret; 246 pthread_t show_parts_thread; 247 Error *local_error = NULL; 248 249 sioc = qio_channel_socket_new(); 250 if (qio_channel_socket_connect_sync(sioc, 251 saddr, 252 &local_error) < 0) { 253 error_report_err(local_error); 254 goto out; 255 } 256 257 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, 258 NULL, NULL, NULL, 259 &size, &local_error); 260 if (ret < 0) { 261 if (local_error) { 262 error_report_err(local_error); 263 } 264 goto out_socket; 265 } 266 267 fd = open(device, O_RDWR); 268 if (fd < 0) { 269 /* Linux-only, we can use %m in printf. */ 270 error_report("Failed to open %s: %m", device); 271 goto out_socket; 272 } 273 274 ret = nbd_init(fd, sioc, nbdflags, size); 275 if (ret < 0) { 276 goto out_fd; 277 } 278 279 /* update partition table */ 280 pthread_create(&show_parts_thread, NULL, show_parts, device); 281 282 if (verbose) { 283 fprintf(stderr, "NBD device %s is now connected to %s\n", 284 device, srcpath); 285 } else { 286 /* Close stderr so that the qemu-nbd process exits. */ 287 dup2(STDOUT_FILENO, STDERR_FILENO); 288 } 289 290 ret = nbd_client(fd); 291 if (ret) { 292 goto out_fd; 293 } 294 close(fd); 295 object_unref(OBJECT(sioc)); 296 kill(getpid(), SIGTERM); 297 return (void *) EXIT_SUCCESS; 298 299 out_fd: 300 close(fd); 301 out_socket: 302 object_unref(OBJECT(sioc)); 303 out: 304 kill(getpid(), SIGTERM); 305 return (void *) EXIT_FAILURE; 306 } 307 308 static int nbd_can_accept(void) 309 { 310 return nb_fds < shared; 311 } 312 313 static void nbd_export_closed(NBDExport *exp) 314 { 315 assert(state == TERMINATING); 316 state = TERMINATED; 317 } 318 319 static void nbd_update_server_watch(void); 320 321 static void nbd_client_closed(NBDClient *client) 322 { 323 nb_fds--; 324 if (nb_fds == 0 && !persistent && state == RUNNING) { 325 state = TERMINATE; 326 } 327 nbd_update_server_watch(); 328 nbd_client_put(client); 329 } 330 331 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 332 { 333 QIOChannelSocket *cioc; 334 335 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 336 NULL); 337 if (!cioc) { 338 return TRUE; 339 } 340 341 if (state >= TERMINATE) { 342 object_unref(OBJECT(cioc)); 343 return TRUE; 344 } 345 346 nb_fds++; 347 nbd_update_server_watch(); 348 nbd_client_new(newproto ? NULL : exp, cioc, 349 tlscreds, NULL, nbd_client_closed); 350 object_unref(OBJECT(cioc)); 351 352 return TRUE; 353 } 354 355 static void nbd_update_server_watch(void) 356 { 357 if (nbd_can_accept()) { 358 if (server_watch == -1) { 359 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 360 G_IO_IN, 361 nbd_accept, 362 NULL, NULL); 363 } 364 } else { 365 if (server_watch != -1) { 366 g_source_remove(server_watch); 367 server_watch = -1; 368 } 369 } 370 } 371 372 373 static SocketAddress *nbd_build_socket_address(const char *sockpath, 374 const char *bindto, 375 const char *port) 376 { 377 SocketAddress *saddr; 378 379 saddr = g_new0(SocketAddress, 1); 380 if (sockpath) { 381 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 382 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); 383 saddr->u.q_unix.data->path = g_strdup(sockpath); 384 } else { 385 InetSocketAddress *inet; 386 saddr->type = SOCKET_ADDRESS_KIND_INET; 387 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); 388 inet->host = g_strdup(bindto); 389 if (port) { 390 inet->port = g_strdup(port); 391 } else { 392 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 393 } 394 } 395 396 return saddr; 397 } 398 399 400 static QemuOptsList file_opts = { 401 .name = "file", 402 .implied_opt_name = "file", 403 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 404 .desc = { 405 /* no elements => accept any params */ 406 { /* end of list */ } 407 }, 408 }; 409 410 static QemuOptsList qemu_object_opts = { 411 .name = "object", 412 .implied_opt_name = "qom-type", 413 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 414 .desc = { 415 { } 416 }, 417 }; 418 419 420 421 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 422 { 423 Object *obj; 424 QCryptoTLSCreds *creds; 425 426 obj = object_resolve_path_component( 427 object_get_objects_root(), id); 428 if (!obj) { 429 error_setg(errp, "No TLS credentials with id '%s'", 430 id); 431 return NULL; 432 } 433 creds = (QCryptoTLSCreds *) 434 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 435 if (!creds) { 436 error_setg(errp, "Object with id '%s' is not TLS credentials", 437 id); 438 return NULL; 439 } 440 441 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 442 error_setg(errp, 443 "Expecting TLS credentials with a server endpoint"); 444 return NULL; 445 } 446 object_ref(obj); 447 return creds; 448 } 449 450 451 int main(int argc, char **argv) 452 { 453 BlockBackend *blk; 454 BlockDriverState *bs; 455 off_t dev_offset = 0; 456 uint32_t nbdflags = 0; 457 bool disconnect = false; 458 const char *bindto = "0.0.0.0"; 459 const char *port = NULL; 460 char *sockpath = NULL; 461 char *device = NULL; 462 off_t fd_size; 463 QemuOpts *sn_opts = NULL; 464 const char *sn_id_or_name = NULL; 465 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; 466 struct option lopt[] = { 467 { "help", no_argument, NULL, 'h' }, 468 { "version", no_argument, NULL, 'V' }, 469 { "bind", required_argument, NULL, 'b' }, 470 { "port", required_argument, NULL, 'p' }, 471 { "socket", required_argument, NULL, 'k' }, 472 { "offset", required_argument, NULL, 'o' }, 473 { "read-only", no_argument, NULL, 'r' }, 474 { "partition", required_argument, NULL, 'P' }, 475 { "connect", required_argument, NULL, 'c' }, 476 { "disconnect", no_argument, NULL, 'd' }, 477 { "snapshot", no_argument, NULL, 's' }, 478 { "load-snapshot", required_argument, NULL, 'l' }, 479 { "nocache", no_argument, NULL, 'n' }, 480 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 481 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 482 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 483 { "detect-zeroes", required_argument, NULL, 484 QEMU_NBD_OPT_DETECT_ZEROES }, 485 { "shared", required_argument, NULL, 'e' }, 486 { "format", required_argument, NULL, 'f' }, 487 { "persistent", no_argument, NULL, 't' }, 488 { "verbose", no_argument, NULL, 'v' }, 489 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 490 { "export-name", required_argument, NULL, 'x' }, 491 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 492 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 493 { NULL, 0, NULL, 0 } 494 }; 495 int ch; 496 int opt_ind = 0; 497 char *end; 498 int flags = BDRV_O_RDWR; 499 int partition = -1; 500 int ret = 0; 501 bool seen_cache = false; 502 bool seen_discard = false; 503 bool seen_aio = false; 504 pthread_t client_thread; 505 const char *fmt = NULL; 506 Error *local_err = NULL; 507 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 508 QDict *options = NULL; 509 const char *export_name = NULL; 510 const char *tlscredsid = NULL; 511 bool imageOpts = false; 512 bool writethrough = true; 513 514 /* The client thread uses SIGTERM to interrupt the server. A signal 515 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 516 */ 517 struct sigaction sa_sigterm; 518 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 519 sa_sigterm.sa_handler = termsig_handler; 520 sigaction(SIGTERM, &sa_sigterm, NULL); 521 module_call_init(MODULE_INIT_QOM); 522 qemu_add_opts(&qemu_object_opts); 523 qemu_init_exec_dir(argv[0]); 524 525 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 526 switch (ch) { 527 case 's': 528 flags |= BDRV_O_SNAPSHOT; 529 break; 530 case 'n': 531 optarg = (char *) "none"; 532 /* fallthrough */ 533 case QEMU_NBD_OPT_CACHE: 534 if (seen_cache) { 535 error_report("-n and --cache can only be specified once"); 536 exit(EXIT_FAILURE); 537 } 538 seen_cache = true; 539 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { 540 error_report("Invalid cache mode `%s'", optarg); 541 exit(EXIT_FAILURE); 542 } 543 break; 544 case QEMU_NBD_OPT_AIO: 545 if (seen_aio) { 546 error_report("--aio can only be specified once"); 547 exit(EXIT_FAILURE); 548 } 549 seen_aio = true; 550 if (!strcmp(optarg, "native")) { 551 flags |= BDRV_O_NATIVE_AIO; 552 } else if (!strcmp(optarg, "threads")) { 553 /* this is the default */ 554 } else { 555 error_report("invalid aio mode `%s'", optarg); 556 exit(EXIT_FAILURE); 557 } 558 break; 559 case QEMU_NBD_OPT_DISCARD: 560 if (seen_discard) { 561 error_report("--discard can only be specified once"); 562 exit(EXIT_FAILURE); 563 } 564 seen_discard = true; 565 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 566 error_report("Invalid discard mode `%s'", optarg); 567 exit(EXIT_FAILURE); 568 } 569 break; 570 case QEMU_NBD_OPT_DETECT_ZEROES: 571 detect_zeroes = 572 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 573 optarg, 574 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 575 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 576 &local_err); 577 if (local_err) { 578 error_reportf_err(local_err, 579 "Failed to parse detect_zeroes mode: "); 580 exit(EXIT_FAILURE); 581 } 582 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 583 !(flags & BDRV_O_UNMAP)) { 584 error_report("setting detect-zeroes to unmap is not allowed " 585 "without setting discard operation to unmap"); 586 exit(EXIT_FAILURE); 587 } 588 break; 589 case 'b': 590 bindto = optarg; 591 break; 592 case 'p': 593 port = optarg; 594 break; 595 case 'o': 596 dev_offset = strtoll (optarg, &end, 0); 597 if (*end) { 598 error_report("Invalid offset `%s'", optarg); 599 exit(EXIT_FAILURE); 600 } 601 if (dev_offset < 0) { 602 error_report("Offset must be positive `%s'", optarg); 603 exit(EXIT_FAILURE); 604 } 605 break; 606 case 'l': 607 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 608 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 609 optarg, false); 610 if (!sn_opts) { 611 error_report("Failed in parsing snapshot param `%s'", 612 optarg); 613 exit(EXIT_FAILURE); 614 } 615 } else { 616 sn_id_or_name = optarg; 617 } 618 /* fall through */ 619 case 'r': 620 nbdflags |= NBD_FLAG_READ_ONLY; 621 flags &= ~BDRV_O_RDWR; 622 break; 623 case 'P': 624 partition = strtol(optarg, &end, 0); 625 if (*end) { 626 error_report("Invalid partition `%s'", optarg); 627 exit(EXIT_FAILURE); 628 } 629 if (partition < 1 || partition > 8) { 630 error_report("Invalid partition %d", partition); 631 exit(EXIT_FAILURE); 632 } 633 break; 634 case 'k': 635 sockpath = optarg; 636 if (sockpath[0] != '/') { 637 error_report("socket path must be absolute"); 638 exit(EXIT_FAILURE); 639 } 640 break; 641 case 'd': 642 disconnect = true; 643 break; 644 case 'c': 645 device = optarg; 646 break; 647 case 'e': 648 shared = strtol(optarg, &end, 0); 649 if (*end) { 650 error_report("Invalid shared device number '%s'", optarg); 651 exit(EXIT_FAILURE); 652 } 653 if (shared < 1) { 654 error_report("Shared device number must be greater than 0"); 655 exit(EXIT_FAILURE); 656 } 657 break; 658 case 'f': 659 fmt = optarg; 660 break; 661 case 't': 662 persistent = 1; 663 break; 664 case 'x': 665 export_name = optarg; 666 break; 667 case 'v': 668 verbose = 1; 669 break; 670 case 'V': 671 version(argv[0]); 672 exit(0); 673 break; 674 case 'h': 675 usage(argv[0]); 676 exit(0); 677 break; 678 case '?': 679 error_report("Try `%s --help' for more information.", argv[0]); 680 exit(EXIT_FAILURE); 681 case QEMU_NBD_OPT_OBJECT: { 682 QemuOpts *opts; 683 opts = qemu_opts_parse_noisily(&qemu_object_opts, 684 optarg, true); 685 if (!opts) { 686 exit(EXIT_FAILURE); 687 } 688 } break; 689 case QEMU_NBD_OPT_TLSCREDS: 690 tlscredsid = optarg; 691 break; 692 case QEMU_NBD_OPT_IMAGE_OPTS: 693 imageOpts = true; 694 break; 695 } 696 } 697 698 if ((argc - optind) != 1) { 699 error_report("Invalid number of arguments"); 700 error_printf("Try `%s --help' for more information.\n", argv[0]); 701 exit(EXIT_FAILURE); 702 } 703 704 if (qemu_opts_foreach(&qemu_object_opts, 705 user_creatable_add_opts_foreach, 706 NULL, &local_err)) { 707 error_report_err(local_err); 708 exit(EXIT_FAILURE); 709 } 710 711 if (tlscredsid) { 712 if (sockpath) { 713 error_report("TLS is only supported with IPv4/IPv6"); 714 exit(EXIT_FAILURE); 715 } 716 if (device) { 717 error_report("TLS is not supported with a host device"); 718 exit(EXIT_FAILURE); 719 } 720 if (!export_name) { 721 /* Set the default NBD protocol export name, since 722 * we *must* use new style protocol for TLS */ 723 export_name = ""; 724 } 725 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 726 if (local_err) { 727 error_report("Failed to get TLS creds %s", 728 error_get_pretty(local_err)); 729 exit(EXIT_FAILURE); 730 } 731 } 732 733 if (disconnect) { 734 int nbdfd = open(argv[optind], O_RDWR); 735 if (nbdfd < 0) { 736 error_report("Cannot open %s: %s", argv[optind], 737 strerror(errno)); 738 exit(EXIT_FAILURE); 739 } 740 nbd_disconnect(nbdfd); 741 742 close(nbdfd); 743 744 printf("%s disconnected\n", argv[optind]); 745 746 return 0; 747 } 748 749 if (device && !verbose) { 750 int stderr_fd[2]; 751 pid_t pid; 752 int ret; 753 754 if (qemu_pipe(stderr_fd) < 0) { 755 error_report("Error setting up communication pipe: %s", 756 strerror(errno)); 757 exit(EXIT_FAILURE); 758 } 759 760 /* Now daemonize, but keep a communication channel open to 761 * print errors and exit with the proper status code. 762 */ 763 pid = fork(); 764 if (pid < 0) { 765 error_report("Failed to fork: %s", strerror(errno)); 766 exit(EXIT_FAILURE); 767 } else if (pid == 0) { 768 close(stderr_fd[0]); 769 ret = qemu_daemon(1, 0); 770 771 /* Temporarily redirect stderr to the parent's pipe... */ 772 dup2(stderr_fd[1], STDERR_FILENO); 773 if (ret < 0) { 774 error_report("Failed to daemonize: %s", strerror(errno)); 775 exit(EXIT_FAILURE); 776 } 777 778 /* ... close the descriptor we inherited and go on. */ 779 close(stderr_fd[1]); 780 } else { 781 bool errors = false; 782 char *buf; 783 784 /* In the parent. Print error messages from the child until 785 * it closes the pipe. 786 */ 787 close(stderr_fd[1]); 788 buf = g_malloc(1024); 789 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 790 errors = true; 791 ret = qemu_write_full(STDERR_FILENO, buf, ret); 792 if (ret < 0) { 793 exit(EXIT_FAILURE); 794 } 795 } 796 if (ret < 0) { 797 error_report("Cannot read from daemon: %s", 798 strerror(errno)); 799 exit(EXIT_FAILURE); 800 } 801 802 /* Usually the daemon should not print any message. 803 * Exit with zero status in that case. 804 */ 805 exit(errors); 806 } 807 } 808 809 if (device != NULL && sockpath == NULL) { 810 sockpath = g_malloc(128); 811 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 812 } 813 814 saddr = nbd_build_socket_address(sockpath, bindto, port); 815 816 if (qemu_init_main_loop(&local_err)) { 817 error_report_err(local_err); 818 exit(EXIT_FAILURE); 819 } 820 bdrv_init(); 821 atexit(bdrv_close_all); 822 823 srcpath = argv[optind]; 824 if (imageOpts) { 825 QemuOpts *opts; 826 if (fmt) { 827 error_report("--image-opts and -f are mutually exclusive"); 828 exit(EXIT_FAILURE); 829 } 830 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 831 if (!opts) { 832 qemu_opts_reset(&file_opts); 833 exit(EXIT_FAILURE); 834 } 835 options = qemu_opts_to_qdict(opts, NULL); 836 qemu_opts_reset(&file_opts); 837 blk = blk_new_open(NULL, NULL, options, flags, &local_err); 838 } else { 839 if (fmt) { 840 options = qdict_new(); 841 qdict_put(options, "driver", qstring_from_str(fmt)); 842 } 843 blk = blk_new_open(srcpath, NULL, options, flags, &local_err); 844 } 845 846 if (!blk) { 847 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 848 argv[optind]); 849 exit(EXIT_FAILURE); 850 } 851 bs = blk_bs(blk); 852 853 blk_set_enable_write_cache(blk, !writethrough); 854 855 if (sn_opts) { 856 ret = bdrv_snapshot_load_tmp(bs, 857 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 858 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 859 &local_err); 860 } else if (sn_id_or_name) { 861 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 862 &local_err); 863 } 864 if (ret < 0) { 865 error_reportf_err(local_err, "Failed to load snapshot: "); 866 exit(EXIT_FAILURE); 867 } 868 869 bs->detect_zeroes = detect_zeroes; 870 fd_size = blk_getlength(blk); 871 if (fd_size < 0) { 872 error_report("Failed to determine the image length: %s", 873 strerror(-fd_size)); 874 exit(EXIT_FAILURE); 875 } 876 877 if (partition != -1) { 878 ret = find_partition(blk, partition, &dev_offset, &fd_size); 879 if (ret < 0) { 880 error_report("Could not find partition %d: %s", partition, 881 strerror(-ret)); 882 exit(EXIT_FAILURE); 883 } 884 } 885 886 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 887 &local_err); 888 if (!exp) { 889 error_report_err(local_err); 890 exit(EXIT_FAILURE); 891 } 892 if (export_name) { 893 nbd_export_set_name(exp, export_name); 894 newproto = true; 895 } 896 897 server_ioc = qio_channel_socket_new(); 898 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 899 object_unref(OBJECT(server_ioc)); 900 error_report_err(local_err); 901 return 1; 902 } 903 904 if (device) { 905 int ret; 906 907 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 908 if (ret != 0) { 909 error_report("Failed to create client thread: %s", strerror(ret)); 910 exit(EXIT_FAILURE); 911 } 912 } else { 913 /* Shut up GCC warnings. */ 914 memset(&client_thread, 0, sizeof(client_thread)); 915 } 916 917 nbd_update_server_watch(); 918 919 /* now when the initialization is (almost) complete, chdir("/") 920 * to free any busy filesystems */ 921 if (chdir("/") < 0) { 922 error_report("Could not chdir to root directory: %s", 923 strerror(errno)); 924 exit(EXIT_FAILURE); 925 } 926 927 state = RUNNING; 928 do { 929 main_loop_wait(false); 930 if (state == TERMINATE) { 931 state = TERMINATING; 932 nbd_export_close(exp); 933 nbd_export_put(exp); 934 exp = NULL; 935 } 936 } while (state != TERMINATED); 937 938 blk_unref(blk); 939 if (sockpath) { 940 unlink(sockpath); 941 } 942 943 qemu_opts_del(sn_opts); 944 945 if (device) { 946 void *ret; 947 pthread_join(client_thread, &ret); 948 exit(ret != NULL); 949 } else { 950 exit(EXIT_SUCCESS); 951 } 952 } 953