1 /* 2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 3 * 4 * Network Block Device 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; under version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include "qapi/error.h" 21 #include "qemu-common.h" 22 #include "qemu/cutils.h" 23 #include "sysemu/block-backend.h" 24 #include "block/block_int.h" 25 #include "block/nbd.h" 26 #include "qemu/main-loop.h" 27 #include "qemu/error-report.h" 28 #include "qemu/config-file.h" 29 #include "qemu/bswap.h" 30 #include "qemu/log.h" 31 #include "block/snapshot.h" 32 #include "qapi/util.h" 33 #include "qapi/qmp/qstring.h" 34 #include "qom/object_interfaces.h" 35 #include "io/channel-socket.h" 36 #include "crypto/init.h" 37 #include "trace/control.h" 38 39 #include <getopt.h> 40 #include <libgen.h> 41 #include <pthread.h> 42 43 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 44 #define QEMU_NBD_OPT_CACHE 256 45 #define QEMU_NBD_OPT_AIO 257 46 #define QEMU_NBD_OPT_DISCARD 258 47 #define QEMU_NBD_OPT_DETECT_ZEROES 259 48 #define QEMU_NBD_OPT_OBJECT 260 49 #define QEMU_NBD_OPT_TLSCREDS 261 50 #define QEMU_NBD_OPT_IMAGE_OPTS 262 51 52 #define MBR_SIZE 512 53 54 static NBDExport *exp; 55 static bool newproto; 56 static int verbose; 57 static char *srcpath; 58 static SocketAddress *saddr; 59 static int persistent = 0; 60 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 61 static int shared = 1; 62 static int nb_fds; 63 static QIOChannelSocket *server_ioc; 64 static int server_watch = -1; 65 static QCryptoTLSCreds *tlscreds; 66 67 static void usage(const char *name) 68 { 69 (printf) ( 70 "Usage: %s [OPTIONS] FILE\n" 71 "QEMU Disk Network Block Device Server\n" 72 "\n" 73 " -h, --help display this help and exit\n" 74 " -V, --version output version information and exit\n" 75 "\n" 76 "Connection properties:\n" 77 " -p, --port=PORT port to listen on (default `%d')\n" 78 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 79 " -k, --socket=PATH path to the unix socket\n" 80 " (default '"SOCKET_PATH"')\n" 81 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 82 " -t, --persistent don't exit on the last connection\n" 83 " -v, --verbose display extra debugging information\n" 84 " -x, --export-name=NAME expose export by name\n" 85 "\n" 86 "Exposing part of the image:\n" 87 " -o, --offset=OFFSET offset into the image\n" 88 " -P, --partition=NUM only expose partition NUM\n" 89 "\n" 90 "General purpose options:\n" 91 " --object type,id=ID,... define an object such as 'secret' for providing\n" 92 " passwords and/or encryption keys\n" 93 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 94 " specify tracing options\n" 95 #ifdef __linux__ 96 "Kernel NBD client support:\n" 97 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 98 " -d, --disconnect disconnect the specified device\n" 99 "\n" 100 #endif 101 "\n" 102 "Block device options:\n" 103 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 104 " -r, --read-only export read-only\n" 105 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 106 " file with backing_file=FILE, redirect the write to\n" 107 " the temporary one\n" 108 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 109 " load an internal snapshot inside FILE and export it\n" 110 " as an read-only device, SNAPSHOT_PARAM format is\n" 111 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 112 " '[ID_OR_NAME]'\n" 113 " -n, --nocache disable host cache\n" 114 " --cache=MODE set cache mode (none, writeback, ...)\n" 115 " --aio=MODE set AIO mode (native or threads)\n" 116 " --discard=MODE set discard mode (ignore, unmap)\n" 117 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 118 " --image-opts treat FILE as a full set of image options\n" 119 "\n" 120 "Report bugs to <qemu-devel@nongnu.org>\n" 121 , name, NBD_DEFAULT_PORT, "DEVICE"); 122 } 123 124 static void version(const char *name) 125 { 126 printf( 127 "%s version 0.0.1\n" 128 "Written by Anthony Liguori.\n" 129 "\n" 130 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 131 "This is free software; see the source for copying conditions. There is NO\n" 132 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 133 , name); 134 } 135 136 struct partition_record 137 { 138 uint8_t bootable; 139 uint8_t start_head; 140 uint32_t start_cylinder; 141 uint8_t start_sector; 142 uint8_t system; 143 uint8_t end_head; 144 uint8_t end_cylinder; 145 uint8_t end_sector; 146 uint32_t start_sector_abs; 147 uint32_t nb_sectors_abs; 148 }; 149 150 static void read_partition(uint8_t *p, struct partition_record *r) 151 { 152 r->bootable = p[0]; 153 r->start_head = p[1]; 154 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 155 r->start_sector = p[2] & 0x3f; 156 r->system = p[4]; 157 r->end_head = p[5]; 158 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 159 r->end_sector = p[6] & 0x3f; 160 161 r->start_sector_abs = ldl_le_p(p + 8); 162 r->nb_sectors_abs = ldl_le_p(p + 12); 163 } 164 165 static int find_partition(BlockBackend *blk, int partition, 166 off_t *offset, off_t *size) 167 { 168 struct partition_record mbr[4]; 169 uint8_t data[MBR_SIZE]; 170 int i; 171 int ext_partnum = 4; 172 int ret; 173 174 ret = blk_pread(blk, 0, data, sizeof(data)); 175 if (ret < 0) { 176 error_report("error while reading: %s", strerror(-ret)); 177 exit(EXIT_FAILURE); 178 } 179 180 if (data[510] != 0x55 || data[511] != 0xaa) { 181 return -EINVAL; 182 } 183 184 for (i = 0; i < 4; i++) { 185 read_partition(&data[446 + 16 * i], &mbr[i]); 186 187 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 188 continue; 189 } 190 191 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 192 struct partition_record ext[4]; 193 uint8_t data1[MBR_SIZE]; 194 int j; 195 196 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, 197 data1, sizeof(data1)); 198 if (ret < 0) { 199 error_report("error while reading: %s", strerror(-ret)); 200 exit(EXIT_FAILURE); 201 } 202 203 for (j = 0; j < 4; j++) { 204 read_partition(&data1[446 + 16 * j], &ext[j]); 205 if (!ext[j].system || !ext[j].nb_sectors_abs) { 206 continue; 207 } 208 209 if ((ext_partnum + j + 1) == partition) { 210 *offset = (uint64_t)ext[j].start_sector_abs << 9; 211 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 212 return 0; 213 } 214 } 215 ext_partnum += 4; 216 } else if ((i + 1) == partition) { 217 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 218 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 219 return 0; 220 } 221 } 222 223 return -ENOENT; 224 } 225 226 static void termsig_handler(int signum) 227 { 228 atomic_cmpxchg(&state, RUNNING, TERMINATE); 229 qemu_notify_event(); 230 } 231 232 233 static void *show_parts(void *arg) 234 { 235 char *device = arg; 236 int nbd; 237 238 /* linux just needs an open() to trigger 239 * the partition table update 240 * but remember to load the module with max_part != 0 : 241 * modprobe nbd max_part=63 242 */ 243 nbd = open(device, O_RDWR); 244 if (nbd >= 0) { 245 close(nbd); 246 } 247 return NULL; 248 } 249 250 static void *nbd_client_thread(void *arg) 251 { 252 char *device = arg; 253 off_t size; 254 uint16_t nbdflags; 255 QIOChannelSocket *sioc; 256 int fd; 257 int ret; 258 pthread_t show_parts_thread; 259 Error *local_error = NULL; 260 261 sioc = qio_channel_socket_new(); 262 if (qio_channel_socket_connect_sync(sioc, 263 saddr, 264 &local_error) < 0) { 265 error_report_err(local_error); 266 goto out; 267 } 268 269 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, 270 NULL, NULL, NULL, 271 &size, &local_error); 272 if (ret < 0) { 273 if (local_error) { 274 error_report_err(local_error); 275 } 276 goto out_socket; 277 } 278 279 fd = open(device, O_RDWR); 280 if (fd < 0) { 281 /* Linux-only, we can use %m in printf. */ 282 error_report("Failed to open %s: %m", device); 283 goto out_socket; 284 } 285 286 ret = nbd_init(fd, sioc, nbdflags, size); 287 if (ret < 0) { 288 goto out_fd; 289 } 290 291 /* update partition table */ 292 pthread_create(&show_parts_thread, NULL, show_parts, device); 293 294 if (verbose) { 295 fprintf(stderr, "NBD device %s is now connected to %s\n", 296 device, srcpath); 297 } else { 298 /* Close stderr so that the qemu-nbd process exits. */ 299 dup2(STDOUT_FILENO, STDERR_FILENO); 300 } 301 302 ret = nbd_client(fd); 303 if (ret) { 304 goto out_fd; 305 } 306 close(fd); 307 object_unref(OBJECT(sioc)); 308 kill(getpid(), SIGTERM); 309 return (void *) EXIT_SUCCESS; 310 311 out_fd: 312 close(fd); 313 out_socket: 314 object_unref(OBJECT(sioc)); 315 out: 316 kill(getpid(), SIGTERM); 317 return (void *) EXIT_FAILURE; 318 } 319 320 static int nbd_can_accept(void) 321 { 322 return nb_fds < shared; 323 } 324 325 static void nbd_export_closed(NBDExport *exp) 326 { 327 assert(state == TERMINATING); 328 state = TERMINATED; 329 } 330 331 static void nbd_update_server_watch(void); 332 333 static void nbd_client_closed(NBDClient *client) 334 { 335 nb_fds--; 336 if (nb_fds == 0 && !persistent && state == RUNNING) { 337 state = TERMINATE; 338 } 339 nbd_update_server_watch(); 340 nbd_client_put(client); 341 } 342 343 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) 344 { 345 QIOChannelSocket *cioc; 346 347 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 348 NULL); 349 if (!cioc) { 350 return TRUE; 351 } 352 353 if (state >= TERMINATE) { 354 object_unref(OBJECT(cioc)); 355 return TRUE; 356 } 357 358 nb_fds++; 359 nbd_update_server_watch(); 360 nbd_client_new(newproto ? NULL : exp, cioc, 361 tlscreds, NULL, nbd_client_closed); 362 object_unref(OBJECT(cioc)); 363 364 return TRUE; 365 } 366 367 static void nbd_update_server_watch(void) 368 { 369 if (nbd_can_accept()) { 370 if (server_watch == -1) { 371 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), 372 G_IO_IN, 373 nbd_accept, 374 NULL, NULL); 375 } 376 } else { 377 if (server_watch != -1) { 378 g_source_remove(server_watch); 379 server_watch = -1; 380 } 381 } 382 } 383 384 385 static SocketAddress *nbd_build_socket_address(const char *sockpath, 386 const char *bindto, 387 const char *port) 388 { 389 SocketAddress *saddr; 390 391 saddr = g_new0(SocketAddress, 1); 392 if (sockpath) { 393 saddr->type = SOCKET_ADDRESS_KIND_UNIX; 394 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); 395 saddr->u.q_unix.data->path = g_strdup(sockpath); 396 } else { 397 InetSocketAddress *inet; 398 saddr->type = SOCKET_ADDRESS_KIND_INET; 399 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); 400 inet->host = g_strdup(bindto); 401 if (port) { 402 inet->port = g_strdup(port); 403 } else { 404 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 405 } 406 } 407 408 return saddr; 409 } 410 411 412 static QemuOptsList file_opts = { 413 .name = "file", 414 .implied_opt_name = "file", 415 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 416 .desc = { 417 /* no elements => accept any params */ 418 { /* end of list */ } 419 }, 420 }; 421 422 static QemuOptsList qemu_object_opts = { 423 .name = "object", 424 .implied_opt_name = "qom-type", 425 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 426 .desc = { 427 { } 428 }, 429 }; 430 431 432 433 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 434 { 435 Object *obj; 436 QCryptoTLSCreds *creds; 437 438 obj = object_resolve_path_component( 439 object_get_objects_root(), id); 440 if (!obj) { 441 error_setg(errp, "No TLS credentials with id '%s'", 442 id); 443 return NULL; 444 } 445 creds = (QCryptoTLSCreds *) 446 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 447 if (!creds) { 448 error_setg(errp, "Object with id '%s' is not TLS credentials", 449 id); 450 return NULL; 451 } 452 453 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 454 error_setg(errp, 455 "Expecting TLS credentials with a server endpoint"); 456 return NULL; 457 } 458 object_ref(obj); 459 return creds; 460 } 461 462 463 int main(int argc, char **argv) 464 { 465 BlockBackend *blk; 466 BlockDriverState *bs; 467 off_t dev_offset = 0; 468 uint16_t nbdflags = 0; 469 bool disconnect = false; 470 const char *bindto = "0.0.0.0"; 471 const char *port = NULL; 472 char *sockpath = NULL; 473 char *device = NULL; 474 off_t fd_size; 475 QemuOpts *sn_opts = NULL; 476 const char *sn_id_or_name = NULL; 477 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:"; 478 struct option lopt[] = { 479 { "help", no_argument, NULL, 'h' }, 480 { "version", no_argument, NULL, 'V' }, 481 { "bind", required_argument, NULL, 'b' }, 482 { "port", required_argument, NULL, 'p' }, 483 { "socket", required_argument, NULL, 'k' }, 484 { "offset", required_argument, NULL, 'o' }, 485 { "read-only", no_argument, NULL, 'r' }, 486 { "partition", required_argument, NULL, 'P' }, 487 { "connect", required_argument, NULL, 'c' }, 488 { "disconnect", no_argument, NULL, 'd' }, 489 { "snapshot", no_argument, NULL, 's' }, 490 { "load-snapshot", required_argument, NULL, 'l' }, 491 { "nocache", no_argument, NULL, 'n' }, 492 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 493 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 494 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 495 { "detect-zeroes", required_argument, NULL, 496 QEMU_NBD_OPT_DETECT_ZEROES }, 497 { "shared", required_argument, NULL, 'e' }, 498 { "format", required_argument, NULL, 'f' }, 499 { "persistent", no_argument, NULL, 't' }, 500 { "verbose", no_argument, NULL, 'v' }, 501 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 502 { "export-name", required_argument, NULL, 'x' }, 503 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 504 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 505 { "trace", required_argument, NULL, 'T' }, 506 { NULL, 0, NULL, 0 } 507 }; 508 int ch; 509 int opt_ind = 0; 510 char *end; 511 int flags = BDRV_O_RDWR; 512 int partition = -1; 513 int ret = 0; 514 bool seen_cache = false; 515 bool seen_discard = false; 516 bool seen_aio = false; 517 pthread_t client_thread; 518 const char *fmt = NULL; 519 Error *local_err = NULL; 520 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 521 QDict *options = NULL; 522 const char *export_name = NULL; 523 const char *tlscredsid = NULL; 524 bool imageOpts = false; 525 bool writethrough = true; 526 char *trace_file = NULL; 527 528 /* The client thread uses SIGTERM to interrupt the server. A signal 529 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 530 */ 531 struct sigaction sa_sigterm; 532 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 533 sa_sigterm.sa_handler = termsig_handler; 534 sigaction(SIGTERM, &sa_sigterm, NULL); 535 536 qcrypto_init(&error_fatal); 537 538 module_call_init(MODULE_INIT_QOM); 539 qemu_add_opts(&qemu_object_opts); 540 qemu_add_opts(&qemu_trace_opts); 541 qemu_init_exec_dir(argv[0]); 542 543 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 544 switch (ch) { 545 case 's': 546 flags |= BDRV_O_SNAPSHOT; 547 break; 548 case 'n': 549 optarg = (char *) "none"; 550 /* fallthrough */ 551 case QEMU_NBD_OPT_CACHE: 552 if (seen_cache) { 553 error_report("-n and --cache can only be specified once"); 554 exit(EXIT_FAILURE); 555 } 556 seen_cache = true; 557 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { 558 error_report("Invalid cache mode `%s'", optarg); 559 exit(EXIT_FAILURE); 560 } 561 break; 562 case QEMU_NBD_OPT_AIO: 563 if (seen_aio) { 564 error_report("--aio can only be specified once"); 565 exit(EXIT_FAILURE); 566 } 567 seen_aio = true; 568 if (!strcmp(optarg, "native")) { 569 flags |= BDRV_O_NATIVE_AIO; 570 } else if (!strcmp(optarg, "threads")) { 571 /* this is the default */ 572 } else { 573 error_report("invalid aio mode `%s'", optarg); 574 exit(EXIT_FAILURE); 575 } 576 break; 577 case QEMU_NBD_OPT_DISCARD: 578 if (seen_discard) { 579 error_report("--discard can only be specified once"); 580 exit(EXIT_FAILURE); 581 } 582 seen_discard = true; 583 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 584 error_report("Invalid discard mode `%s'", optarg); 585 exit(EXIT_FAILURE); 586 } 587 break; 588 case QEMU_NBD_OPT_DETECT_ZEROES: 589 detect_zeroes = 590 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 591 optarg, 592 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 593 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 594 &local_err); 595 if (local_err) { 596 error_reportf_err(local_err, 597 "Failed to parse detect_zeroes mode: "); 598 exit(EXIT_FAILURE); 599 } 600 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 601 !(flags & BDRV_O_UNMAP)) { 602 error_report("setting detect-zeroes to unmap is not allowed " 603 "without setting discard operation to unmap"); 604 exit(EXIT_FAILURE); 605 } 606 break; 607 case 'b': 608 bindto = optarg; 609 break; 610 case 'p': 611 port = optarg; 612 break; 613 case 'o': 614 dev_offset = strtoll (optarg, &end, 0); 615 if (*end) { 616 error_report("Invalid offset `%s'", optarg); 617 exit(EXIT_FAILURE); 618 } 619 if (dev_offset < 0) { 620 error_report("Offset must be positive `%s'", optarg); 621 exit(EXIT_FAILURE); 622 } 623 break; 624 case 'l': 625 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 626 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 627 optarg, false); 628 if (!sn_opts) { 629 error_report("Failed in parsing snapshot param `%s'", 630 optarg); 631 exit(EXIT_FAILURE); 632 } 633 } else { 634 sn_id_or_name = optarg; 635 } 636 /* fall through */ 637 case 'r': 638 nbdflags |= NBD_FLAG_READ_ONLY; 639 flags &= ~BDRV_O_RDWR; 640 break; 641 case 'P': 642 partition = strtol(optarg, &end, 0); 643 if (*end) { 644 error_report("Invalid partition `%s'", optarg); 645 exit(EXIT_FAILURE); 646 } 647 if (partition < 1 || partition > 8) { 648 error_report("Invalid partition %d", partition); 649 exit(EXIT_FAILURE); 650 } 651 break; 652 case 'k': 653 sockpath = optarg; 654 if (sockpath[0] != '/') { 655 error_report("socket path must be absolute"); 656 exit(EXIT_FAILURE); 657 } 658 break; 659 case 'd': 660 disconnect = true; 661 break; 662 case 'c': 663 device = optarg; 664 break; 665 case 'e': 666 shared = strtol(optarg, &end, 0); 667 if (*end) { 668 error_report("Invalid shared device number '%s'", optarg); 669 exit(EXIT_FAILURE); 670 } 671 if (shared < 1) { 672 error_report("Shared device number must be greater than 0"); 673 exit(EXIT_FAILURE); 674 } 675 break; 676 case 'f': 677 fmt = optarg; 678 break; 679 case 't': 680 persistent = 1; 681 break; 682 case 'x': 683 export_name = optarg; 684 break; 685 case 'v': 686 verbose = 1; 687 break; 688 case 'V': 689 version(argv[0]); 690 exit(0); 691 break; 692 case 'h': 693 usage(argv[0]); 694 exit(0); 695 break; 696 case '?': 697 error_report("Try `%s --help' for more information.", argv[0]); 698 exit(EXIT_FAILURE); 699 case QEMU_NBD_OPT_OBJECT: { 700 QemuOpts *opts; 701 opts = qemu_opts_parse_noisily(&qemu_object_opts, 702 optarg, true); 703 if (!opts) { 704 exit(EXIT_FAILURE); 705 } 706 } break; 707 case QEMU_NBD_OPT_TLSCREDS: 708 tlscredsid = optarg; 709 break; 710 case QEMU_NBD_OPT_IMAGE_OPTS: 711 imageOpts = true; 712 break; 713 case 'T': 714 g_free(trace_file); 715 trace_file = trace_opt_parse(optarg); 716 break; 717 } 718 } 719 720 if ((argc - optind) != 1) { 721 error_report("Invalid number of arguments"); 722 error_printf("Try `%s --help' for more information.\n", argv[0]); 723 exit(EXIT_FAILURE); 724 } 725 726 if (qemu_opts_foreach(&qemu_object_opts, 727 user_creatable_add_opts_foreach, 728 NULL, NULL)) { 729 exit(EXIT_FAILURE); 730 } 731 732 if (!trace_init_backends()) { 733 exit(1); 734 } 735 trace_init_file(trace_file); 736 qemu_set_log(LOG_TRACE); 737 738 if (tlscredsid) { 739 if (sockpath) { 740 error_report("TLS is only supported with IPv4/IPv6"); 741 exit(EXIT_FAILURE); 742 } 743 if (device) { 744 error_report("TLS is not supported with a host device"); 745 exit(EXIT_FAILURE); 746 } 747 if (!export_name) { 748 /* Set the default NBD protocol export name, since 749 * we *must* use new style protocol for TLS */ 750 export_name = ""; 751 } 752 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 753 if (local_err) { 754 error_report("Failed to get TLS creds %s", 755 error_get_pretty(local_err)); 756 exit(EXIT_FAILURE); 757 } 758 } 759 760 if (disconnect) { 761 int nbdfd = open(argv[optind], O_RDWR); 762 if (nbdfd < 0) { 763 error_report("Cannot open %s: %s", argv[optind], 764 strerror(errno)); 765 exit(EXIT_FAILURE); 766 } 767 nbd_disconnect(nbdfd); 768 769 close(nbdfd); 770 771 printf("%s disconnected\n", argv[optind]); 772 773 return 0; 774 } 775 776 if (device && !verbose) { 777 int stderr_fd[2]; 778 pid_t pid; 779 int ret; 780 781 if (qemu_pipe(stderr_fd) < 0) { 782 error_report("Error setting up communication pipe: %s", 783 strerror(errno)); 784 exit(EXIT_FAILURE); 785 } 786 787 /* Now daemonize, but keep a communication channel open to 788 * print errors and exit with the proper status code. 789 */ 790 pid = fork(); 791 if (pid < 0) { 792 error_report("Failed to fork: %s", strerror(errno)); 793 exit(EXIT_FAILURE); 794 } else if (pid == 0) { 795 close(stderr_fd[0]); 796 ret = qemu_daemon(1, 0); 797 798 /* Temporarily redirect stderr to the parent's pipe... */ 799 dup2(stderr_fd[1], STDERR_FILENO); 800 if (ret < 0) { 801 error_report("Failed to daemonize: %s", strerror(errno)); 802 exit(EXIT_FAILURE); 803 } 804 805 /* ... close the descriptor we inherited and go on. */ 806 close(stderr_fd[1]); 807 } else { 808 bool errors = false; 809 char *buf; 810 811 /* In the parent. Print error messages from the child until 812 * it closes the pipe. 813 */ 814 close(stderr_fd[1]); 815 buf = g_malloc(1024); 816 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 817 errors = true; 818 ret = qemu_write_full(STDERR_FILENO, buf, ret); 819 if (ret < 0) { 820 exit(EXIT_FAILURE); 821 } 822 } 823 if (ret < 0) { 824 error_report("Cannot read from daemon: %s", 825 strerror(errno)); 826 exit(EXIT_FAILURE); 827 } 828 829 /* Usually the daemon should not print any message. 830 * Exit with zero status in that case. 831 */ 832 exit(errors); 833 } 834 } 835 836 if (device != NULL && sockpath == NULL) { 837 sockpath = g_malloc(128); 838 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 839 } 840 841 saddr = nbd_build_socket_address(sockpath, bindto, port); 842 843 if (qemu_init_main_loop(&local_err)) { 844 error_report_err(local_err); 845 exit(EXIT_FAILURE); 846 } 847 bdrv_init(); 848 atexit(bdrv_close_all); 849 850 srcpath = argv[optind]; 851 if (imageOpts) { 852 QemuOpts *opts; 853 if (fmt) { 854 error_report("--image-opts and -f are mutually exclusive"); 855 exit(EXIT_FAILURE); 856 } 857 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 858 if (!opts) { 859 qemu_opts_reset(&file_opts); 860 exit(EXIT_FAILURE); 861 } 862 options = qemu_opts_to_qdict(opts, NULL); 863 qemu_opts_reset(&file_opts); 864 blk = blk_new_open(NULL, NULL, options, flags, &local_err); 865 } else { 866 if (fmt) { 867 options = qdict_new(); 868 qdict_put(options, "driver", qstring_from_str(fmt)); 869 } 870 blk = blk_new_open(srcpath, NULL, options, flags, &local_err); 871 } 872 873 if (!blk) { 874 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 875 argv[optind]); 876 exit(EXIT_FAILURE); 877 } 878 bs = blk_bs(blk); 879 880 blk_set_enable_write_cache(blk, !writethrough); 881 882 if (sn_opts) { 883 ret = bdrv_snapshot_load_tmp(bs, 884 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 885 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 886 &local_err); 887 } else if (sn_id_or_name) { 888 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 889 &local_err); 890 } 891 if (ret < 0) { 892 error_reportf_err(local_err, "Failed to load snapshot: "); 893 exit(EXIT_FAILURE); 894 } 895 896 bs->detect_zeroes = detect_zeroes; 897 fd_size = blk_getlength(blk); 898 if (fd_size < 0) { 899 error_report("Failed to determine the image length: %s", 900 strerror(-fd_size)); 901 exit(EXIT_FAILURE); 902 } 903 904 if (partition != -1) { 905 ret = find_partition(blk, partition, &dev_offset, &fd_size); 906 if (ret < 0) { 907 error_report("Could not find partition %d: %s", partition, 908 strerror(-ret)); 909 exit(EXIT_FAILURE); 910 } 911 } 912 913 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, 914 &local_err); 915 if (!exp) { 916 error_report_err(local_err); 917 exit(EXIT_FAILURE); 918 } 919 if (export_name) { 920 nbd_export_set_name(exp, export_name); 921 newproto = true; 922 } 923 924 server_ioc = qio_channel_socket_new(); 925 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { 926 object_unref(OBJECT(server_ioc)); 927 error_report_err(local_err); 928 return 1; 929 } 930 931 if (device) { 932 int ret; 933 934 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 935 if (ret != 0) { 936 error_report("Failed to create client thread: %s", strerror(ret)); 937 exit(EXIT_FAILURE); 938 } 939 } else { 940 /* Shut up GCC warnings. */ 941 memset(&client_thread, 0, sizeof(client_thread)); 942 } 943 944 nbd_update_server_watch(); 945 946 /* now when the initialization is (almost) complete, chdir("/") 947 * to free any busy filesystems */ 948 if (chdir("/") < 0) { 949 error_report("Could not chdir to root directory: %s", 950 strerror(errno)); 951 exit(EXIT_FAILURE); 952 } 953 954 state = RUNNING; 955 do { 956 main_loop_wait(false); 957 if (state == TERMINATE) { 958 state = TERMINATING; 959 nbd_export_close(exp); 960 nbd_export_put(exp); 961 exp = NULL; 962 } 963 } while (state != TERMINATED); 964 965 blk_unref(blk); 966 if (sockpath) { 967 unlink(sockpath); 968 } 969 970 qemu_opts_del(sn_opts); 971 972 if (device) { 973 void *ret; 974 pthread_join(client_thread, &ret); 975 exit(ret != NULL); 976 } else { 977 exit(EXIT_SUCCESS); 978 } 979 } 980