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 #include "crypto/init.h" 35 36 #include <getopt.h> 37 #include <libgen.h> 38 #include <pthread.h> 39 40 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 41 #define QEMU_NBD_OPT_CACHE 256 42 #define QEMU_NBD_OPT_AIO 257 43 #define QEMU_NBD_OPT_DISCARD 258 44 #define QEMU_NBD_OPT_DETECT_ZEROES 259 45 #define QEMU_NBD_OPT_OBJECT 260 46 #define QEMU_NBD_OPT_TLSCREDS 261 47 #define QEMU_NBD_OPT_IMAGE_OPTS 262 48 49 #define MBR_SIZE 512 50 51 static NBDExport *exp; 52 static bool newproto; 53 static int verbose; 54 static char *srcpath; 55 static SocketAddress *saddr; 56 static int persistent = 0; 57 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 58 static int shared = 1; 59 static int nb_fds; 60 static QIOChannelSocket *server_ioc; 61 static int server_watch = -1; 62 static QCryptoTLSCreds *tlscreds; 63 64 static void usage(const char *name) 65 { 66 (printf) ( 67 "Usage: %s [OPTIONS] FILE\n" 68 "QEMU Disk Network Block Device Server\n" 69 "\n" 70 " -h, --help display this help and exit\n" 71 " -V, --version output version information and exit\n" 72 "\n" 73 "Connection properties:\n" 74 " -p, --port=PORT port to listen on (default `%d')\n" 75 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 76 " -k, --socket=PATH path to the unix socket\n" 77 " (default '"SOCKET_PATH"')\n" 78 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 79 " -t, --persistent don't exit on the last connection\n" 80 " -v, --verbose display extra debugging information\n" 81 " -x, --export-name=NAME expose export by name\n" 82 "\n" 83 "Exposing part of the image:\n" 84 " -o, --offset=OFFSET offset into the image\n" 85 " -P, --partition=NUM only expose partition NUM\n" 86 "\n" 87 "General purpose options:\n" 88 " --object type,id=ID,... define an object such as 'secret' for providing\n" 89 " passwords and/or encryption keys\n" 90 #ifdef __linux__ 91 "Kernel NBD client support:\n" 92 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 93 " -d, --disconnect disconnect the specified device\n" 94 "\n" 95 #endif 96 "\n" 97 "Block device options:\n" 98 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 99 " -r, --read-only export read-only\n" 100 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 101 " file with backing_file=FILE, redirect the write to\n" 102 " the temporary one\n" 103 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 104 " load an internal snapshot inside FILE and export it\n" 105 " as an read-only device, SNAPSHOT_PARAM format is\n" 106 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 107 " '[ID_OR_NAME]'\n" 108 " -n, --nocache disable host cache\n" 109 " --cache=MODE set cache mode (none, writeback, ...)\n" 110 " --aio=MODE set AIO mode (native or threads)\n" 111 " --discard=MODE set discard mode (ignore, unmap)\n" 112 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 113 " --image-opts treat FILE as a full set of image options\n" 114 "\n" 115 "Report bugs to <qemu-devel@nongnu.org>\n" 116 , name, NBD_DEFAULT_PORT, "DEVICE"); 117 } 118 119 static void version(const char *name) 120 { 121 printf( 122 "%s version 0.0.1\n" 123 "Written by Anthony Liguori.\n" 124 "\n" 125 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 126 "This is free software; see the source for copying conditions. There is NO\n" 127 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 128 , name); 129 } 130 131 struct partition_record 132 { 133 uint8_t bootable; 134 uint8_t start_head; 135 uint32_t start_cylinder; 136 uint8_t start_sector; 137 uint8_t system; 138 uint8_t end_head; 139 uint8_t end_cylinder; 140 uint8_t end_sector; 141 uint32_t start_sector_abs; 142 uint32_t nb_sectors_abs; 143 }; 144 145 static void read_partition(uint8_t *p, struct partition_record *r) 146 { 147 r->bootable = p[0]; 148 r->start_head = p[1]; 149 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 150 r->start_sector = p[2] & 0x3f; 151 r->system = p[4]; 152 r->end_head = p[5]; 153 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 154 r->end_sector = p[6] & 0x3f; 155 156 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); 157 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); 158 } 159 160 static int find_partition(BlockBackend *blk, int partition, 161 off_t *offset, off_t *size) 162 { 163 struct partition_record mbr[4]; 164 uint8_t data[MBR_SIZE]; 165 int i; 166 int ext_partnum = 4; 167 int ret; 168 169 ret = blk_pread(blk, 0, data, sizeof(data)); 170 if (ret < 0) { 171 error_report("error while reading: %s", strerror(-ret)); 172 exit(EXIT_FAILURE); 173 } 174 175 if (data[510] != 0x55 || data[511] != 0xaa) { 176 return -EINVAL; 177 } 178 179 for (i = 0; i < 4; i++) { 180 read_partition(&data[446 + 16 * i], &mbr[i]); 181 182 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 183 continue; 184 } 185 186 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 187 struct partition_record ext[4]; 188 uint8_t data1[MBR_SIZE]; 189 int j; 190 191 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, 192 data1, sizeof(data1)); 193 if (ret < 0) { 194 error_report("error while reading: %s", strerror(-ret)); 195 exit(EXIT_FAILURE); 196 } 197 198 for (j = 0; j < 4; j++) { 199 read_partition(&data1[446 + 16 * j], &ext[j]); 200 if (!ext[j].system || !ext[j].nb_sectors_abs) { 201 continue; 202 } 203 204 if ((ext_partnum + j + 1) == partition) { 205 *offset = (uint64_t)ext[j].start_sector_abs << 9; 206 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 207 return 0; 208 } 209 } 210 ext_partnum += 4; 211 } else if ((i + 1) == partition) { 212 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 213 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 214 return 0; 215 } 216 } 217 218 return -ENOENT; 219 } 220 221 static void termsig_handler(int signum) 222 { 223 atomic_cmpxchg(&state, RUNNING, TERMINATE); 224 qemu_notify_event(); 225 } 226 227 228 static void *show_parts(void *arg) 229 { 230 char *device = arg; 231 int nbd; 232 233 /* linux just needs an open() to trigger 234 * the partition table update 235 * but remember to load the module with max_part != 0 : 236 * modprobe nbd max_part=63 237 */ 238 nbd = open(device, O_RDWR); 239 if (nbd >= 0) { 240 close(nbd); 241 } 242 return NULL; 243 } 244 245 static void *nbd_client_thread(void *arg) 246 { 247 char *device = arg; 248 off_t size; 249 uint32_t nbdflags; 250 QIOChannelSocket *sioc; 251 int fd; 252 int ret; 253 pthread_t show_parts_thread; 254 Error *local_error = NULL; 255 256 sioc = qio_channel_socket_new(); 257 if (qio_channel_socket_connect_sync(sioc, 258 saddr, 259 &local_error) < 0) { 260 error_report_err(local_error); 261 goto out; 262 } 263 264 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, 265 NULL, NULL, NULL, 266 &size, &local_error); 267 if (ret < 0) { 268 if (local_error) { 269 error_report_err(local_error); 270 } 271 goto out_socket; 272 } 273 274 fd = open(device, O_RDWR); 275 if (fd < 0) { 276 /* Linux-only, we can use %m in printf. */ 277 error_report("Failed to open %s: %m", device); 278 goto out_socket; 279 } 280 281 ret = nbd_init(fd, sioc, nbdflags, size); 282 if (ret < 0) { 283 goto out_fd; 284 } 285 286 /* update partition table */ 287 pthread_create(&show_parts_thread, NULL, show_parts, device); 288 289 if (verbose) { 290 fprintf(stderr, "NBD device %s is now connected to %s\n", 291 device, srcpath); 292 } else { 293 /* Close stderr so that the qemu-nbd process exits. */ 294 dup2(STDOUT_FILENO, STDERR_FILENO); 295 } 296 297 ret = nbd_client(fd); 298 if (ret) { 299 goto out_fd; 300 } 301 close(fd); 302 object_unref(OBJECT(sioc)); 303 kill(getpid(), SIGTERM); 304 return (void *) EXIT_SUCCESS; 305 306 out_fd: 307 close(fd); 308 out_socket: 309 object_unref(OBJECT(sioc)); 310 out: 311 kill(getpid(), SIGTERM); 312 return (void *) EXIT_FAILURE; 313 } 314 315 static int nbd_can_accept(void) 316 { 317 return nb_fds < shared; 318 } 319 320 static void nbd_export_closed(NBDExport *exp) 321 { 322 assert(state == TERMINATING); 323 state = TERMINATED; 324 } 325 326 static void nbd_update_server_watch(void); 327 328 static void nbd_client_closed(NBDClient *client) 329 { 330 nb_fds--; 331 if (nb_fds == 0 && !persistent && state == RUNNING) { 332 state = TERMINATE; 333 } 334 nbd_update_server_watch(); 335 nbd_client_put(client); 336 } 337 338 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 339 { 340 QIOChannelSocket *cioc; 341 342 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 343 NULL); 344 if (!cioc) { 345 return TRUE; 346 } 347 348 if (state >= TERMINATE) { 349 object_unref(OBJECT(cioc)); 350 return TRUE; 351 } 352 353 nb_fds++; 354 nbd_update_server_watch(); 355 nbd_client_new(newproto ? NULL : exp, cioc, 356 tlscreds, NULL, nbd_client_closed); 357 object_unref(OBJECT(cioc)); 358 359 return TRUE; 360 } 361 362 static void nbd_update_server_watch(void) 363 { 364 if (nbd_can_accept()) { 365 if (server_watch == -1) { 366 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 367 G_IO_IN, 368 nbd_accept, 369 NULL, NULL); 370 } 371 } else { 372 if (server_watch != -1) { 373 g_source_remove(server_watch); 374 server_watch = -1; 375 } 376 } 377 } 378 379 380 static SocketAddress *nbd_build_socket_address(const char *sockpath, 381 const char *bindto, 382 const char *port) 383 { 384 SocketAddress *saddr; 385 386 saddr = g_new0(SocketAddress, 1); 387 if (sockpath) { 388 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 389 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); 390 saddr->u.q_unix.data->path = g_strdup(sockpath); 391 } else { 392 InetSocketAddress *inet; 393 saddr->type = SOCKET_ADDRESS_KIND_INET; 394 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); 395 inet->host = g_strdup(bindto); 396 if (port) { 397 inet->port = g_strdup(port); 398 } else { 399 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 400 } 401 } 402 403 return saddr; 404 } 405 406 407 static QemuOptsList file_opts = { 408 .name = "file", 409 .implied_opt_name = "file", 410 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 411 .desc = { 412 /* no elements => accept any params */ 413 { /* end of list */ } 414 }, 415 }; 416 417 static QemuOptsList qemu_object_opts = { 418 .name = "object", 419 .implied_opt_name = "qom-type", 420 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 421 .desc = { 422 { } 423 }, 424 }; 425 426 427 428 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 429 { 430 Object *obj; 431 QCryptoTLSCreds *creds; 432 433 obj = object_resolve_path_component( 434 object_get_objects_root(), id); 435 if (!obj) { 436 error_setg(errp, "No TLS credentials with id '%s'", 437 id); 438 return NULL; 439 } 440 creds = (QCryptoTLSCreds *) 441 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 442 if (!creds) { 443 error_setg(errp, "Object with id '%s' is not TLS credentials", 444 id); 445 return NULL; 446 } 447 448 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 449 error_setg(errp, 450 "Expecting TLS credentials with a server endpoint"); 451 return NULL; 452 } 453 object_ref(obj); 454 return creds; 455 } 456 457 458 int main(int argc, char **argv) 459 { 460 BlockBackend *blk; 461 BlockDriverState *bs; 462 off_t dev_offset = 0; 463 uint32_t nbdflags = 0; 464 bool disconnect = false; 465 const char *bindto = "0.0.0.0"; 466 const char *port = NULL; 467 char *sockpath = NULL; 468 char *device = NULL; 469 off_t fd_size; 470 QemuOpts *sn_opts = NULL; 471 const char *sn_id_or_name = NULL; 472 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; 473 struct option lopt[] = { 474 { "help", no_argument, NULL, 'h' }, 475 { "version", no_argument, NULL, 'V' }, 476 { "bind", required_argument, NULL, 'b' }, 477 { "port", required_argument, NULL, 'p' }, 478 { "socket", required_argument, NULL, 'k' }, 479 { "offset", required_argument, NULL, 'o' }, 480 { "read-only", no_argument, NULL, 'r' }, 481 { "partition", required_argument, NULL, 'P' }, 482 { "connect", required_argument, NULL, 'c' }, 483 { "disconnect", no_argument, NULL, 'd' }, 484 { "snapshot", no_argument, NULL, 's' }, 485 { "load-snapshot", required_argument, NULL, 'l' }, 486 { "nocache", no_argument, NULL, 'n' }, 487 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 488 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 489 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 490 { "detect-zeroes", required_argument, NULL, 491 QEMU_NBD_OPT_DETECT_ZEROES }, 492 { "shared", required_argument, NULL, 'e' }, 493 { "format", required_argument, NULL, 'f' }, 494 { "persistent", no_argument, NULL, 't' }, 495 { "verbose", no_argument, NULL, 'v' }, 496 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 497 { "export-name", required_argument, NULL, 'x' }, 498 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 499 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 500 { NULL, 0, NULL, 0 } 501 }; 502 int ch; 503 int opt_ind = 0; 504 char *end; 505 int flags = BDRV_O_RDWR; 506 int partition = -1; 507 int ret = 0; 508 bool seen_cache = false; 509 bool seen_discard = false; 510 bool seen_aio = false; 511 pthread_t client_thread; 512 const char *fmt = NULL; 513 Error *local_err = NULL; 514 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 515 QDict *options = NULL; 516 const char *export_name = NULL; 517 const char *tlscredsid = NULL; 518 bool imageOpts = false; 519 bool writethrough = true; 520 521 /* The client thread uses SIGTERM to interrupt the server. A signal 522 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 523 */ 524 struct sigaction sa_sigterm; 525 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 526 sa_sigterm.sa_handler = termsig_handler; 527 sigaction(SIGTERM, &sa_sigterm, NULL); 528 529 if (qcrypto_init(&local_err) < 0) { 530 error_reportf_err(local_err, "cannot initialize crypto: "); 531 exit(1); 532 } 533 534 module_call_init(MODULE_INIT_QOM); 535 qemu_add_opts(&qemu_object_opts); 536 qemu_init_exec_dir(argv[0]); 537 538 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 539 switch (ch) { 540 case 's': 541 flags |= BDRV_O_SNAPSHOT; 542 break; 543 case 'n': 544 optarg = (char *) "none"; 545 /* fallthrough */ 546 case QEMU_NBD_OPT_CACHE: 547 if (seen_cache) { 548 error_report("-n and --cache can only be specified once"); 549 exit(EXIT_FAILURE); 550 } 551 seen_cache = true; 552 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { 553 error_report("Invalid cache mode `%s'", optarg); 554 exit(EXIT_FAILURE); 555 } 556 break; 557 case QEMU_NBD_OPT_AIO: 558 if (seen_aio) { 559 error_report("--aio can only be specified once"); 560 exit(EXIT_FAILURE); 561 } 562 seen_aio = true; 563 if (!strcmp(optarg, "native")) { 564 flags |= BDRV_O_NATIVE_AIO; 565 } else if (!strcmp(optarg, "threads")) { 566 /* this is the default */ 567 } else { 568 error_report("invalid aio mode `%s'", optarg); 569 exit(EXIT_FAILURE); 570 } 571 break; 572 case QEMU_NBD_OPT_DISCARD: 573 if (seen_discard) { 574 error_report("--discard can only be specified once"); 575 exit(EXIT_FAILURE); 576 } 577 seen_discard = true; 578 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 579 error_report("Invalid discard mode `%s'", optarg); 580 exit(EXIT_FAILURE); 581 } 582 break; 583 case QEMU_NBD_OPT_DETECT_ZEROES: 584 detect_zeroes = 585 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 586 optarg, 587 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 588 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 589 &local_err); 590 if (local_err) { 591 error_reportf_err(local_err, 592 "Failed to parse detect_zeroes mode: "); 593 exit(EXIT_FAILURE); 594 } 595 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 596 !(flags & BDRV_O_UNMAP)) { 597 error_report("setting detect-zeroes to unmap is not allowed " 598 "without setting discard operation to unmap"); 599 exit(EXIT_FAILURE); 600 } 601 break; 602 case 'b': 603 bindto = optarg; 604 break; 605 case 'p': 606 port = optarg; 607 break; 608 case 'o': 609 dev_offset = strtoll (optarg, &end, 0); 610 if (*end) { 611 error_report("Invalid offset `%s'", optarg); 612 exit(EXIT_FAILURE); 613 } 614 if (dev_offset < 0) { 615 error_report("Offset must be positive `%s'", optarg); 616 exit(EXIT_FAILURE); 617 } 618 break; 619 case 'l': 620 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 621 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 622 optarg, false); 623 if (!sn_opts) { 624 error_report("Failed in parsing snapshot param `%s'", 625 optarg); 626 exit(EXIT_FAILURE); 627 } 628 } else { 629 sn_id_or_name = optarg; 630 } 631 /* fall through */ 632 case 'r': 633 nbdflags |= NBD_FLAG_READ_ONLY; 634 flags &= ~BDRV_O_RDWR; 635 break; 636 case 'P': 637 partition = strtol(optarg, &end, 0); 638 if (*end) { 639 error_report("Invalid partition `%s'", optarg); 640 exit(EXIT_FAILURE); 641 } 642 if (partition < 1 || partition > 8) { 643 error_report("Invalid partition %d", partition); 644 exit(EXIT_FAILURE); 645 } 646 break; 647 case 'k': 648 sockpath = optarg; 649 if (sockpath[0] != '/') { 650 error_report("socket path must be absolute"); 651 exit(EXIT_FAILURE); 652 } 653 break; 654 case 'd': 655 disconnect = true; 656 break; 657 case 'c': 658 device = optarg; 659 break; 660 case 'e': 661 shared = strtol(optarg, &end, 0); 662 if (*end) { 663 error_report("Invalid shared device number '%s'", optarg); 664 exit(EXIT_FAILURE); 665 } 666 if (shared < 1) { 667 error_report("Shared device number must be greater than 0"); 668 exit(EXIT_FAILURE); 669 } 670 break; 671 case 'f': 672 fmt = optarg; 673 break; 674 case 't': 675 persistent = 1; 676 break; 677 case 'x': 678 export_name = optarg; 679 break; 680 case 'v': 681 verbose = 1; 682 break; 683 case 'V': 684 version(argv[0]); 685 exit(0); 686 break; 687 case 'h': 688 usage(argv[0]); 689 exit(0); 690 break; 691 case '?': 692 error_report("Try `%s --help' for more information.", argv[0]); 693 exit(EXIT_FAILURE); 694 case QEMU_NBD_OPT_OBJECT: { 695 QemuOpts *opts; 696 opts = qemu_opts_parse_noisily(&qemu_object_opts, 697 optarg, true); 698 if (!opts) { 699 exit(EXIT_FAILURE); 700 } 701 } break; 702 case QEMU_NBD_OPT_TLSCREDS: 703 tlscredsid = optarg; 704 break; 705 case QEMU_NBD_OPT_IMAGE_OPTS: 706 imageOpts = true; 707 break; 708 } 709 } 710 711 if ((argc - optind) != 1) { 712 error_report("Invalid number of arguments"); 713 error_printf("Try `%s --help' for more information.\n", argv[0]); 714 exit(EXIT_FAILURE); 715 } 716 717 if (qemu_opts_foreach(&qemu_object_opts, 718 user_creatable_add_opts_foreach, 719 NULL, NULL)) { 720 exit(EXIT_FAILURE); 721 } 722 723 if (tlscredsid) { 724 if (sockpath) { 725 error_report("TLS is only supported with IPv4/IPv6"); 726 exit(EXIT_FAILURE); 727 } 728 if (device) { 729 error_report("TLS is not supported with a host device"); 730 exit(EXIT_FAILURE); 731 } 732 if (!export_name) { 733 /* Set the default NBD protocol export name, since 734 * we *must* use new style protocol for TLS */ 735 export_name = ""; 736 } 737 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 738 if (local_err) { 739 error_report("Failed to get TLS creds %s", 740 error_get_pretty(local_err)); 741 exit(EXIT_FAILURE); 742 } 743 } 744 745 if (disconnect) { 746 int nbdfd = open(argv[optind], O_RDWR); 747 if (nbdfd < 0) { 748 error_report("Cannot open %s: %s", argv[optind], 749 strerror(errno)); 750 exit(EXIT_FAILURE); 751 } 752 nbd_disconnect(nbdfd); 753 754 close(nbdfd); 755 756 printf("%s disconnected\n", argv[optind]); 757 758 return 0; 759 } 760 761 if (device && !verbose) { 762 int stderr_fd[2]; 763 pid_t pid; 764 int ret; 765 766 if (qemu_pipe(stderr_fd) < 0) { 767 error_report("Error setting up communication pipe: %s", 768 strerror(errno)); 769 exit(EXIT_FAILURE); 770 } 771 772 /* Now daemonize, but keep a communication channel open to 773 * print errors and exit with the proper status code. 774 */ 775 pid = fork(); 776 if (pid < 0) { 777 error_report("Failed to fork: %s", strerror(errno)); 778 exit(EXIT_FAILURE); 779 } else if (pid == 0) { 780 close(stderr_fd[0]); 781 ret = qemu_daemon(1, 0); 782 783 /* Temporarily redirect stderr to the parent's pipe... */ 784 dup2(stderr_fd[1], STDERR_FILENO); 785 if (ret < 0) { 786 error_report("Failed to daemonize: %s", strerror(errno)); 787 exit(EXIT_FAILURE); 788 } 789 790 /* ... close the descriptor we inherited and go on. */ 791 close(stderr_fd[1]); 792 } else { 793 bool errors = false; 794 char *buf; 795 796 /* In the parent. Print error messages from the child until 797 * it closes the pipe. 798 */ 799 close(stderr_fd[1]); 800 buf = g_malloc(1024); 801 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 802 errors = true; 803 ret = qemu_write_full(STDERR_FILENO, buf, ret); 804 if (ret < 0) { 805 exit(EXIT_FAILURE); 806 } 807 } 808 if (ret < 0) { 809 error_report("Cannot read from daemon: %s", 810 strerror(errno)); 811 exit(EXIT_FAILURE); 812 } 813 814 /* Usually the daemon should not print any message. 815 * Exit with zero status in that case. 816 */ 817 exit(errors); 818 } 819 } 820 821 if (device != NULL && sockpath == NULL) { 822 sockpath = g_malloc(128); 823 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 824 } 825 826 saddr = nbd_build_socket_address(sockpath, bindto, port); 827 828 if (qemu_init_main_loop(&local_err)) { 829 error_report_err(local_err); 830 exit(EXIT_FAILURE); 831 } 832 bdrv_init(); 833 atexit(bdrv_close_all); 834 835 srcpath = argv[optind]; 836 if (imageOpts) { 837 QemuOpts *opts; 838 if (fmt) { 839 error_report("--image-opts and -f are mutually exclusive"); 840 exit(EXIT_FAILURE); 841 } 842 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 843 if (!opts) { 844 qemu_opts_reset(&file_opts); 845 exit(EXIT_FAILURE); 846 } 847 options = qemu_opts_to_qdict(opts, NULL); 848 qemu_opts_reset(&file_opts); 849 blk = blk_new_open(NULL, NULL, options, flags, &local_err); 850 } else { 851 if (fmt) { 852 options = qdict_new(); 853 qdict_put(options, "driver", qstring_from_str(fmt)); 854 } 855 blk = blk_new_open(srcpath, NULL, options, flags, &local_err); 856 } 857 858 if (!blk) { 859 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 860 argv[optind]); 861 exit(EXIT_FAILURE); 862 } 863 bs = blk_bs(blk); 864 865 blk_set_enable_write_cache(blk, !writethrough); 866 867 if (sn_opts) { 868 ret = bdrv_snapshot_load_tmp(bs, 869 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 870 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 871 &local_err); 872 } else if (sn_id_or_name) { 873 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 874 &local_err); 875 } 876 if (ret < 0) { 877 error_reportf_err(local_err, "Failed to load snapshot: "); 878 exit(EXIT_FAILURE); 879 } 880 881 bs->detect_zeroes = detect_zeroes; 882 fd_size = blk_getlength(blk); 883 if (fd_size < 0) { 884 error_report("Failed to determine the image length: %s", 885 strerror(-fd_size)); 886 exit(EXIT_FAILURE); 887 } 888 889 if (partition != -1) { 890 ret = find_partition(blk, partition, &dev_offset, &fd_size); 891 if (ret < 0) { 892 error_report("Could not find partition %d: %s", partition, 893 strerror(-ret)); 894 exit(EXIT_FAILURE); 895 } 896 } 897 898 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 899 &local_err); 900 if (!exp) { 901 error_report_err(local_err); 902 exit(EXIT_FAILURE); 903 } 904 if (export_name) { 905 nbd_export_set_name(exp, export_name); 906 newproto = true; 907 } 908 909 server_ioc = qio_channel_socket_new(); 910 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 911 object_unref(OBJECT(server_ioc)); 912 error_report_err(local_err); 913 return 1; 914 } 915 916 if (device) { 917 int ret; 918 919 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 920 if (ret != 0) { 921 error_report("Failed to create client thread: %s", strerror(ret)); 922 exit(EXIT_FAILURE); 923 } 924 } else { 925 /* Shut up GCC warnings. */ 926 memset(&client_thread, 0, sizeof(client_thread)); 927 } 928 929 nbd_update_server_watch(); 930 931 /* now when the initialization is (almost) complete, chdir("/") 932 * to free any busy filesystems */ 933 if (chdir("/") < 0) { 934 error_report("Could not chdir to root directory: %s", 935 strerror(errno)); 936 exit(EXIT_FAILURE); 937 } 938 939 state = RUNNING; 940 do { 941 main_loop_wait(false); 942 if (state == TERMINATE) { 943 state = TERMINATING; 944 nbd_export_close(exp); 945 nbd_export_put(exp); 946 exp = NULL; 947 } 948 } while (state != TERMINATED); 949 950 blk_unref(blk); 951 if (sockpath) { 952 unlink(sockpath); 953 } 954 955 qemu_opts_del(sn_opts); 956 957 if (device) { 958 void *ret; 959 pthread_join(client_thread, &ret); 960 exit(ret != NULL); 961 } else { 962 exit(EXIT_SUCCESS); 963 } 964 } 965