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