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 <getopt.h> 21 #include <libgen.h> 22 #include <pthread.h> 23 24 #include "qapi/error.h" 25 #include "qemu-common.h" 26 #include "qemu/cutils.h" 27 #include "sysemu/block-backend.h" 28 #include "block/block_int.h" 29 #include "block/nbd.h" 30 #include "qemu/main-loop.h" 31 #include "qemu/error-report.h" 32 #include "qemu/config-file.h" 33 #include "qemu/bswap.h" 34 #include "qemu/log.h" 35 #include "qemu/systemd.h" 36 #include "block/snapshot.h" 37 #include "qapi/qmp/qstring.h" 38 #include "qom/object_interfaces.h" 39 #include "io/channel-socket.h" 40 #include "io/net-listener.h" 41 #include "crypto/init.h" 42 #include "trace/control.h" 43 #include "qemu-version.h" 44 45 #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 46 #define QEMU_NBD_OPT_CACHE 256 47 #define QEMU_NBD_OPT_AIO 257 48 #define QEMU_NBD_OPT_DISCARD 258 49 #define QEMU_NBD_OPT_DETECT_ZEROES 259 50 #define QEMU_NBD_OPT_OBJECT 260 51 #define QEMU_NBD_OPT_TLSCREDS 261 52 #define QEMU_NBD_OPT_IMAGE_OPTS 262 53 #define QEMU_NBD_OPT_FORK 263 54 55 #define MBR_SIZE 512 56 57 static NBDExport *exp; 58 static bool newproto; 59 static int verbose; 60 static char *srcpath; 61 static SocketAddress *saddr; 62 static int persistent = 0; 63 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; 64 static int shared = 1; 65 static int nb_fds; 66 static QIONetListener *server; 67 static QCryptoTLSCreds *tlscreds; 68 69 static void usage(const char *name) 70 { 71 (printf) ( 72 "Usage: %s [OPTIONS] FILE\n" 73 "QEMU Disk Network Block Device Server\n" 74 "\n" 75 " -h, --help display this help and exit\n" 76 " -V, --version output version information and exit\n" 77 "\n" 78 "Connection properties:\n" 79 " -p, --port=PORT port to listen on (default `%d')\n" 80 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 81 " -k, --socket=PATH path to the unix socket\n" 82 " (default '"SOCKET_PATH"')\n" 83 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 84 " -t, --persistent don't exit on the last connection\n" 85 " -v, --verbose display extra debugging information\n" 86 " -x, --export-name=NAME expose export by name\n" 87 " -D, --description=TEXT with -x, also export a human-readable description\n" 88 "\n" 89 "Exposing part of the image:\n" 90 " -o, --offset=OFFSET offset into the image\n" 91 " -P, --partition=NUM only expose partition NUM\n" 92 "\n" 93 "General purpose options:\n" 94 " --object type,id=ID,... define an object such as 'secret' for providing\n" 95 " passwords and/or encryption keys\n" 96 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 97 " specify tracing options\n" 98 " --fork fork off the server process and exit the parent\n" 99 " once the server is running\n" 100 #ifdef __linux__ 101 "Kernel NBD client support:\n" 102 " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 103 " -d, --disconnect disconnect the specified device\n" 104 "\n" 105 #endif 106 "\n" 107 "Block device options:\n" 108 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" 109 " -r, --read-only export read-only\n" 110 " -s, --snapshot use FILE as an external snapshot, create a temporary\n" 111 " file with backing_file=FILE, redirect the write to\n" 112 " the temporary one\n" 113 " -l, --load-snapshot=SNAPSHOT_PARAM\n" 114 " load an internal snapshot inside FILE and export it\n" 115 " as an read-only device, SNAPSHOT_PARAM format is\n" 116 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" 117 " '[ID_OR_NAME]'\n" 118 " -n, --nocache disable host cache\n" 119 " --cache=MODE set cache mode (none, writeback, ...)\n" 120 " --aio=MODE set AIO mode (native or threads)\n" 121 " --discard=MODE set discard mode (ignore, unmap)\n" 122 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" 123 " --image-opts treat FILE as a full set of image options\n" 124 "\n" 125 QEMU_HELP_BOTTOM "\n" 126 , name, NBD_DEFAULT_PORT, "DEVICE"); 127 } 128 129 static void version(const char *name) 130 { 131 printf( 132 "%s " QEMU_VERSION QEMU_PKGVERSION "\n" 133 "Written by Anthony Liguori.\n" 134 "\n" 135 QEMU_COPYRIGHT "\n" 136 "This is free software; see the source for copying conditions. There is NO\n" 137 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 138 , name); 139 } 140 141 struct partition_record 142 { 143 uint8_t bootable; 144 uint8_t start_head; 145 uint32_t start_cylinder; 146 uint8_t start_sector; 147 uint8_t system; 148 uint8_t end_head; 149 uint8_t end_cylinder; 150 uint8_t end_sector; 151 uint32_t start_sector_abs; 152 uint32_t nb_sectors_abs; 153 }; 154 155 static void read_partition(uint8_t *p, struct partition_record *r) 156 { 157 r->bootable = p[0]; 158 r->start_head = p[1]; 159 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 160 r->start_sector = p[2] & 0x3f; 161 r->system = p[4]; 162 r->end_head = p[5]; 163 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 164 r->end_sector = p[6] & 0x3f; 165 166 r->start_sector_abs = ldl_le_p(p + 8); 167 r->nb_sectors_abs = ldl_le_p(p + 12); 168 } 169 170 static int find_partition(BlockBackend *blk, int partition, 171 off_t *offset, off_t *size) 172 { 173 struct partition_record mbr[4]; 174 uint8_t data[MBR_SIZE]; 175 int i; 176 int ext_partnum = 4; 177 int ret; 178 179 ret = blk_pread(blk, 0, data, sizeof(data)); 180 if (ret < 0) { 181 error_report("error while reading: %s", strerror(-ret)); 182 exit(EXIT_FAILURE); 183 } 184 185 if (data[510] != 0x55 || data[511] != 0xaa) { 186 return -EINVAL; 187 } 188 189 for (i = 0; i < 4; i++) { 190 read_partition(&data[446 + 16 * i], &mbr[i]); 191 192 if (!mbr[i].system || !mbr[i].nb_sectors_abs) { 193 continue; 194 } 195 196 if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 197 struct partition_record ext[4]; 198 uint8_t data1[MBR_SIZE]; 199 int j; 200 201 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, 202 data1, sizeof(data1)); 203 if (ret < 0) { 204 error_report("error while reading: %s", strerror(-ret)); 205 exit(EXIT_FAILURE); 206 } 207 208 for (j = 0; j < 4; j++) { 209 read_partition(&data1[446 + 16 * j], &ext[j]); 210 if (!ext[j].system || !ext[j].nb_sectors_abs) { 211 continue; 212 } 213 214 if ((ext_partnum + j + 1) == partition) { 215 *offset = (uint64_t)ext[j].start_sector_abs << 9; 216 *size = (uint64_t)ext[j].nb_sectors_abs << 9; 217 return 0; 218 } 219 } 220 ext_partnum += 4; 221 } else if ((i + 1) == partition) { 222 *offset = (uint64_t)mbr[i].start_sector_abs << 9; 223 *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 224 return 0; 225 } 226 } 227 228 return -ENOENT; 229 } 230 231 static void termsig_handler(int signum) 232 { 233 atomic_cmpxchg(&state, RUNNING, TERMINATE); 234 qemu_notify_event(); 235 } 236 237 238 static void *show_parts(void *arg) 239 { 240 char *device = arg; 241 int nbd; 242 243 /* linux just needs an open() to trigger 244 * the partition table update 245 * but remember to load the module with max_part != 0 : 246 * modprobe nbd max_part=63 247 */ 248 nbd = open(device, O_RDWR); 249 if (nbd >= 0) { 250 close(nbd); 251 } 252 return NULL; 253 } 254 255 static void *nbd_client_thread(void *arg) 256 { 257 char *device = arg; 258 NBDExportInfo info = { .request_sizes = false, }; 259 QIOChannelSocket *sioc; 260 int fd; 261 int ret; 262 pthread_t show_parts_thread; 263 Error *local_error = NULL; 264 265 sioc = qio_channel_socket_new(); 266 if (qio_channel_socket_connect_sync(sioc, 267 saddr, 268 &local_error) < 0) { 269 error_report_err(local_error); 270 goto out; 271 } 272 273 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, 274 NULL, NULL, NULL, &info, &local_error); 275 if (ret < 0) { 276 if (local_error) { 277 error_report_err(local_error); 278 } 279 goto out_socket; 280 } 281 282 fd = open(device, O_RDWR); 283 if (fd < 0) { 284 /* Linux-only, we can use %m in printf. */ 285 error_report("Failed to open %s: %m", device); 286 goto out_socket; 287 } 288 289 ret = nbd_init(fd, sioc, &info, &local_error); 290 if (ret < 0) { 291 error_report_err(local_error); 292 goto out_fd; 293 } 294 295 /* update partition table */ 296 pthread_create(&show_parts_thread, NULL, show_parts, device); 297 298 if (verbose) { 299 fprintf(stderr, "NBD device %s is now connected to %s\n", 300 device, srcpath); 301 } else { 302 /* Close stderr so that the qemu-nbd process exits. */ 303 dup2(STDOUT_FILENO, STDERR_FILENO); 304 } 305 306 ret = nbd_client(fd); 307 if (ret) { 308 goto out_fd; 309 } 310 close(fd); 311 object_unref(OBJECT(sioc)); 312 kill(getpid(), SIGTERM); 313 return (void *) EXIT_SUCCESS; 314 315 out_fd: 316 close(fd); 317 out_socket: 318 object_unref(OBJECT(sioc)); 319 out: 320 kill(getpid(), SIGTERM); 321 return (void *) EXIT_FAILURE; 322 } 323 324 static int nbd_can_accept(void) 325 { 326 return state == RUNNING && nb_fds < shared; 327 } 328 329 static void nbd_export_closed(NBDExport *exp) 330 { 331 assert(state == TERMINATING); 332 state = TERMINATED; 333 } 334 335 static void nbd_update_server_watch(void); 336 337 static void nbd_client_closed(NBDClient *client, bool negotiated) 338 { 339 nb_fds--; 340 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) { 341 state = TERMINATE; 342 } 343 nbd_update_server_watch(); 344 nbd_client_put(client); 345 } 346 347 static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc, 348 gpointer opaque) 349 { 350 if (state >= TERMINATE) { 351 return; 352 } 353 354 nb_fds++; 355 nbd_update_server_watch(); 356 nbd_client_new(newproto ? NULL : exp, cioc, 357 tlscreds, NULL, nbd_client_closed); 358 } 359 360 static void nbd_update_server_watch(void) 361 { 362 if (nbd_can_accept()) { 363 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL); 364 } else { 365 qio_net_listener_set_client_func(server, NULL, NULL, NULL); 366 } 367 } 368 369 370 static SocketAddress *nbd_build_socket_address(const char *sockpath, 371 const char *bindto, 372 const char *port) 373 { 374 SocketAddress *saddr; 375 376 saddr = g_new0(SocketAddress, 1); 377 if (sockpath) { 378 saddr->type = SOCKET_ADDRESS_TYPE_UNIX; 379 saddr->u.q_unix.path = g_strdup(sockpath); 380 } else { 381 InetSocketAddress *inet; 382 saddr->type = SOCKET_ADDRESS_TYPE_INET; 383 inet = &saddr->u.inet; 384 inet->host = g_strdup(bindto); 385 if (port) { 386 inet->port = g_strdup(port); 387 } else { 388 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); 389 } 390 } 391 392 return saddr; 393 } 394 395 396 static QemuOptsList file_opts = { 397 .name = "file", 398 .implied_opt_name = "file", 399 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 400 .desc = { 401 /* no elements => accept any params */ 402 { /* end of list */ } 403 }, 404 }; 405 406 static QemuOptsList qemu_object_opts = { 407 .name = "object", 408 .implied_opt_name = "qom-type", 409 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), 410 .desc = { 411 { } 412 }, 413 }; 414 415 416 417 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) 418 { 419 Object *obj; 420 QCryptoTLSCreds *creds; 421 422 obj = object_resolve_path_component( 423 object_get_objects_root(), id); 424 if (!obj) { 425 error_setg(errp, "No TLS credentials with id '%s'", 426 id); 427 return NULL; 428 } 429 creds = (QCryptoTLSCreds *) 430 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); 431 if (!creds) { 432 error_setg(errp, "Object with id '%s' is not TLS credentials", 433 id); 434 return NULL; 435 } 436 437 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 438 error_setg(errp, 439 "Expecting TLS credentials with a server endpoint"); 440 return NULL; 441 } 442 object_ref(obj); 443 return creds; 444 } 445 446 static void setup_address_and_port(const char **address, const char **port) 447 { 448 if (*address == NULL) { 449 *address = "0.0.0.0"; 450 } 451 452 if (*port == NULL) { 453 *port = stringify(NBD_DEFAULT_PORT); 454 } 455 } 456 457 /* 458 * Check socket parameters compatibility when socket activation is used. 459 */ 460 static const char *socket_activation_validate_opts(const char *device, 461 const char *sockpath, 462 const char *address, 463 const char *port) 464 { 465 if (device != NULL) { 466 return "NBD device can't be set when using socket activation"; 467 } 468 469 if (sockpath != NULL) { 470 return "Unix socket can't be set when using socket activation"; 471 } 472 473 if (address != NULL) { 474 return "The interface can't be set when using socket activation"; 475 } 476 477 if (port != NULL) { 478 return "TCP port number can't be set when using socket activation"; 479 } 480 481 return NULL; 482 } 483 484 int main(int argc, char **argv) 485 { 486 BlockBackend *blk; 487 BlockDriverState *bs; 488 off_t dev_offset = 0; 489 uint16_t nbdflags = 0; 490 bool disconnect = false; 491 const char *bindto = NULL; 492 const char *port = NULL; 493 char *sockpath = NULL; 494 char *device = NULL; 495 off_t fd_size; 496 QemuOpts *sn_opts = NULL; 497 const char *sn_id_or_name = NULL; 498 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:"; 499 struct option lopt[] = { 500 { "help", no_argument, NULL, 'h' }, 501 { "version", no_argument, NULL, 'V' }, 502 { "bind", required_argument, NULL, 'b' }, 503 { "port", required_argument, NULL, 'p' }, 504 { "socket", required_argument, NULL, 'k' }, 505 { "offset", required_argument, NULL, 'o' }, 506 { "read-only", no_argument, NULL, 'r' }, 507 { "partition", required_argument, NULL, 'P' }, 508 { "connect", required_argument, NULL, 'c' }, 509 { "disconnect", no_argument, NULL, 'd' }, 510 { "snapshot", no_argument, NULL, 's' }, 511 { "load-snapshot", required_argument, NULL, 'l' }, 512 { "nocache", no_argument, NULL, 'n' }, 513 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, 514 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, 515 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, 516 { "detect-zeroes", required_argument, NULL, 517 QEMU_NBD_OPT_DETECT_ZEROES }, 518 { "shared", required_argument, NULL, 'e' }, 519 { "format", required_argument, NULL, 'f' }, 520 { "persistent", no_argument, NULL, 't' }, 521 { "verbose", no_argument, NULL, 'v' }, 522 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, 523 { "export-name", required_argument, NULL, 'x' }, 524 { "description", required_argument, NULL, 'D' }, 525 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, 526 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, 527 { "trace", required_argument, NULL, 'T' }, 528 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK }, 529 { NULL, 0, NULL, 0 } 530 }; 531 int ch; 532 int opt_ind = 0; 533 char *end; 534 int flags = BDRV_O_RDWR; 535 int partition = -1; 536 int ret = 0; 537 bool seen_cache = false; 538 bool seen_discard = false; 539 bool seen_aio = false; 540 pthread_t client_thread; 541 const char *fmt = NULL; 542 Error *local_err = NULL; 543 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 544 QDict *options = NULL; 545 const char *export_name = NULL; 546 const char *export_description = NULL; 547 const char *tlscredsid = NULL; 548 bool imageOpts = false; 549 bool writethrough = true; 550 char *trace_file = NULL; 551 bool fork_process = false; 552 int old_stderr = -1; 553 unsigned socket_activation; 554 555 /* The client thread uses SIGTERM to interrupt the server. A signal 556 * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 557 */ 558 struct sigaction sa_sigterm; 559 memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 560 sa_sigterm.sa_handler = termsig_handler; 561 sigaction(SIGTERM, &sa_sigterm, NULL); 562 563 #ifdef CONFIG_POSIX 564 signal(SIGPIPE, SIG_IGN); 565 #endif 566 567 module_call_init(MODULE_INIT_TRACE); 568 qcrypto_init(&error_fatal); 569 570 module_call_init(MODULE_INIT_QOM); 571 qemu_add_opts(&qemu_object_opts); 572 qemu_add_opts(&qemu_trace_opts); 573 qemu_init_exec_dir(argv[0]); 574 575 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 576 switch (ch) { 577 case 's': 578 flags |= BDRV_O_SNAPSHOT; 579 break; 580 case 'n': 581 optarg = (char *) "none"; 582 /* fallthrough */ 583 case QEMU_NBD_OPT_CACHE: 584 if (seen_cache) { 585 error_report("-n and --cache can only be specified once"); 586 exit(EXIT_FAILURE); 587 } 588 seen_cache = true; 589 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { 590 error_report("Invalid cache mode `%s'", optarg); 591 exit(EXIT_FAILURE); 592 } 593 break; 594 case QEMU_NBD_OPT_AIO: 595 if (seen_aio) { 596 error_report("--aio can only be specified once"); 597 exit(EXIT_FAILURE); 598 } 599 seen_aio = true; 600 if (!strcmp(optarg, "native")) { 601 flags |= BDRV_O_NATIVE_AIO; 602 } else if (!strcmp(optarg, "threads")) { 603 /* this is the default */ 604 } else { 605 error_report("invalid aio mode `%s'", optarg); 606 exit(EXIT_FAILURE); 607 } 608 break; 609 case QEMU_NBD_OPT_DISCARD: 610 if (seen_discard) { 611 error_report("--discard can only be specified once"); 612 exit(EXIT_FAILURE); 613 } 614 seen_discard = true; 615 if (bdrv_parse_discard_flags(optarg, &flags) == -1) { 616 error_report("Invalid discard mode `%s'", optarg); 617 exit(EXIT_FAILURE); 618 } 619 break; 620 case QEMU_NBD_OPT_DETECT_ZEROES: 621 detect_zeroes = 622 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 623 optarg, 624 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 625 &local_err); 626 if (local_err) { 627 error_reportf_err(local_err, 628 "Failed to parse detect_zeroes mode: "); 629 exit(EXIT_FAILURE); 630 } 631 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 632 !(flags & BDRV_O_UNMAP)) { 633 error_report("setting detect-zeroes to unmap is not allowed " 634 "without setting discard operation to unmap"); 635 exit(EXIT_FAILURE); 636 } 637 break; 638 case 'b': 639 bindto = optarg; 640 break; 641 case 'p': 642 port = optarg; 643 break; 644 case 'o': 645 dev_offset = strtoll (optarg, &end, 0); 646 if (*end) { 647 error_report("Invalid offset `%s'", optarg); 648 exit(EXIT_FAILURE); 649 } 650 if (dev_offset < 0) { 651 error_report("Offset must be positive `%s'", optarg); 652 exit(EXIT_FAILURE); 653 } 654 break; 655 case 'l': 656 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { 657 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, 658 optarg, false); 659 if (!sn_opts) { 660 error_report("Failed in parsing snapshot param `%s'", 661 optarg); 662 exit(EXIT_FAILURE); 663 } 664 } else { 665 sn_id_or_name = optarg; 666 } 667 /* fall through */ 668 case 'r': 669 nbdflags |= NBD_FLAG_READ_ONLY; 670 flags &= ~BDRV_O_RDWR; 671 break; 672 case 'P': 673 partition = strtol(optarg, &end, 0); 674 if (*end) { 675 error_report("Invalid partition `%s'", optarg); 676 exit(EXIT_FAILURE); 677 } 678 if (partition < 1 || partition > 8) { 679 error_report("Invalid partition %d", partition); 680 exit(EXIT_FAILURE); 681 } 682 break; 683 case 'k': 684 sockpath = optarg; 685 if (sockpath[0] != '/') { 686 error_report("socket path must be absolute"); 687 exit(EXIT_FAILURE); 688 } 689 break; 690 case 'd': 691 disconnect = true; 692 break; 693 case 'c': 694 device = optarg; 695 break; 696 case 'e': 697 shared = strtol(optarg, &end, 0); 698 if (*end) { 699 error_report("Invalid shared device number '%s'", optarg); 700 exit(EXIT_FAILURE); 701 } 702 if (shared < 1) { 703 error_report("Shared device number must be greater than 0"); 704 exit(EXIT_FAILURE); 705 } 706 break; 707 case 'f': 708 fmt = optarg; 709 break; 710 case 't': 711 persistent = 1; 712 break; 713 case 'x': 714 export_name = optarg; 715 break; 716 case 'D': 717 export_description = optarg; 718 break; 719 case 'v': 720 verbose = 1; 721 break; 722 case 'V': 723 version(argv[0]); 724 exit(0); 725 break; 726 case 'h': 727 usage(argv[0]); 728 exit(0); 729 break; 730 case '?': 731 error_report("Try `%s --help' for more information.", argv[0]); 732 exit(EXIT_FAILURE); 733 case QEMU_NBD_OPT_OBJECT: { 734 QemuOpts *opts; 735 opts = qemu_opts_parse_noisily(&qemu_object_opts, 736 optarg, true); 737 if (!opts) { 738 exit(EXIT_FAILURE); 739 } 740 } break; 741 case QEMU_NBD_OPT_TLSCREDS: 742 tlscredsid = optarg; 743 break; 744 case QEMU_NBD_OPT_IMAGE_OPTS: 745 imageOpts = true; 746 break; 747 case 'T': 748 g_free(trace_file); 749 trace_file = trace_opt_parse(optarg); 750 break; 751 case QEMU_NBD_OPT_FORK: 752 fork_process = true; 753 break; 754 } 755 } 756 757 if ((argc - optind) != 1) { 758 error_report("Invalid number of arguments"); 759 error_printf("Try `%s --help' for more information.\n", argv[0]); 760 exit(EXIT_FAILURE); 761 } 762 763 if (qemu_opts_foreach(&qemu_object_opts, 764 user_creatable_add_opts_foreach, 765 NULL, NULL)) { 766 exit(EXIT_FAILURE); 767 } 768 769 if (!trace_init_backends()) { 770 exit(1); 771 } 772 trace_init_file(trace_file); 773 qemu_set_log(LOG_TRACE); 774 775 socket_activation = check_socket_activation(); 776 if (socket_activation == 0) { 777 setup_address_and_port(&bindto, &port); 778 } else { 779 /* Using socket activation - check user didn't use -p etc. */ 780 const char *err_msg = socket_activation_validate_opts(device, sockpath, 781 bindto, port); 782 if (err_msg != NULL) { 783 error_report("%s", err_msg); 784 exit(EXIT_FAILURE); 785 } 786 787 /* qemu-nbd can only listen on a single socket. */ 788 if (socket_activation > 1) { 789 error_report("qemu-nbd does not support socket activation with %s > 1", 790 "LISTEN_FDS"); 791 exit(EXIT_FAILURE); 792 } 793 } 794 795 if (tlscredsid) { 796 if (sockpath) { 797 error_report("TLS is only supported with IPv4/IPv6"); 798 exit(EXIT_FAILURE); 799 } 800 if (device) { 801 error_report("TLS is not supported with a host device"); 802 exit(EXIT_FAILURE); 803 } 804 if (!export_name) { 805 /* Set the default NBD protocol export name, since 806 * we *must* use new style protocol for TLS */ 807 export_name = ""; 808 } 809 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); 810 if (local_err) { 811 error_report("Failed to get TLS creds %s", 812 error_get_pretty(local_err)); 813 exit(EXIT_FAILURE); 814 } 815 } 816 817 if (disconnect) { 818 int nbdfd = open(argv[optind], O_RDWR); 819 if (nbdfd < 0) { 820 error_report("Cannot open %s: %s", argv[optind], 821 strerror(errno)); 822 exit(EXIT_FAILURE); 823 } 824 nbd_disconnect(nbdfd); 825 826 close(nbdfd); 827 828 printf("%s disconnected\n", argv[optind]); 829 830 return 0; 831 } 832 833 if ((device && !verbose) || fork_process) { 834 int stderr_fd[2]; 835 pid_t pid; 836 int ret; 837 838 if (qemu_pipe(stderr_fd) < 0) { 839 error_report("Error setting up communication pipe: %s", 840 strerror(errno)); 841 exit(EXIT_FAILURE); 842 } 843 844 /* Now daemonize, but keep a communication channel open to 845 * print errors and exit with the proper status code. 846 */ 847 pid = fork(); 848 if (pid < 0) { 849 error_report("Failed to fork: %s", strerror(errno)); 850 exit(EXIT_FAILURE); 851 } else if (pid == 0) { 852 close(stderr_fd[0]); 853 ret = qemu_daemon(1, 0); 854 855 /* Temporarily redirect stderr to the parent's pipe... */ 856 old_stderr = dup(STDERR_FILENO); 857 dup2(stderr_fd[1], STDERR_FILENO); 858 if (ret < 0) { 859 error_report("Failed to daemonize: %s", strerror(errno)); 860 exit(EXIT_FAILURE); 861 } 862 863 /* ... close the descriptor we inherited and go on. */ 864 close(stderr_fd[1]); 865 } else { 866 bool errors = false; 867 char *buf; 868 869 /* In the parent. Print error messages from the child until 870 * it closes the pipe. 871 */ 872 close(stderr_fd[1]); 873 buf = g_malloc(1024); 874 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 875 errors = true; 876 ret = qemu_write_full(STDERR_FILENO, buf, ret); 877 if (ret < 0) { 878 exit(EXIT_FAILURE); 879 } 880 } 881 if (ret < 0) { 882 error_report("Cannot read from daemon: %s", 883 strerror(errno)); 884 exit(EXIT_FAILURE); 885 } 886 887 /* Usually the daemon should not print any message. 888 * Exit with zero status in that case. 889 */ 890 exit(errors); 891 } 892 } 893 894 if (device != NULL && sockpath == NULL) { 895 sockpath = g_malloc(128); 896 snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 897 } 898 899 server = qio_net_listener_new(); 900 if (socket_activation == 0) { 901 saddr = nbd_build_socket_address(sockpath, bindto, port); 902 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) { 903 object_unref(OBJECT(server)); 904 error_report_err(local_err); 905 exit(EXIT_FAILURE); 906 } 907 } else { 908 size_t i; 909 /* See comment in check_socket_activation above. */ 910 for (i = 0; i < socket_activation; i++) { 911 QIOChannelSocket *sioc; 912 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i, 913 &local_err); 914 if (sioc == NULL) { 915 object_unref(OBJECT(server)); 916 error_report("Failed to use socket activation: %s", 917 error_get_pretty(local_err)); 918 exit(EXIT_FAILURE); 919 } 920 qio_net_listener_add(server, sioc); 921 object_unref(OBJECT(sioc)); 922 } 923 } 924 925 if (qemu_init_main_loop(&local_err)) { 926 error_report_err(local_err); 927 exit(EXIT_FAILURE); 928 } 929 bdrv_init(); 930 atexit(bdrv_close_all); 931 932 srcpath = argv[optind]; 933 if (imageOpts) { 934 QemuOpts *opts; 935 if (fmt) { 936 error_report("--image-opts and -f are mutually exclusive"); 937 exit(EXIT_FAILURE); 938 } 939 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); 940 if (!opts) { 941 qemu_opts_reset(&file_opts); 942 exit(EXIT_FAILURE); 943 } 944 options = qemu_opts_to_qdict(opts, NULL); 945 qemu_opts_reset(&file_opts); 946 blk = blk_new_open(NULL, NULL, options, flags, &local_err); 947 } else { 948 if (fmt) { 949 options = qdict_new(); 950 qdict_put_str(options, "driver", fmt); 951 } 952 blk = blk_new_open(srcpath, NULL, options, flags, &local_err); 953 } 954 955 if (!blk) { 956 error_reportf_err(local_err, "Failed to blk_new_open '%s': ", 957 argv[optind]); 958 exit(EXIT_FAILURE); 959 } 960 bs = blk_bs(blk); 961 962 blk_set_enable_write_cache(blk, !writethrough); 963 964 if (sn_opts) { 965 ret = bdrv_snapshot_load_tmp(bs, 966 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), 967 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), 968 &local_err); 969 } else if (sn_id_or_name) { 970 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, 971 &local_err); 972 } 973 if (ret < 0) { 974 error_reportf_err(local_err, "Failed to load snapshot: "); 975 exit(EXIT_FAILURE); 976 } 977 978 bs->detect_zeroes = detect_zeroes; 979 fd_size = blk_getlength(blk); 980 if (fd_size < 0) { 981 error_report("Failed to determine the image length: %s", 982 strerror(-fd_size)); 983 exit(EXIT_FAILURE); 984 } 985 986 if (dev_offset >= fd_size) { 987 error_report("Offset (%lld) has to be smaller than the image size " 988 "(%lld)", 989 (long long int)dev_offset, (long long int)fd_size); 990 exit(EXIT_FAILURE); 991 } 992 fd_size -= dev_offset; 993 994 if (partition != -1) { 995 ret = find_partition(blk, partition, &dev_offset, &fd_size); 996 if (ret < 0) { 997 error_report("Could not find partition %d: %s", partition, 998 strerror(-ret)); 999 exit(EXIT_FAILURE); 1000 } 1001 } 1002 1003 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed, 1004 writethrough, NULL, &local_err); 1005 if (!exp) { 1006 error_report_err(local_err); 1007 exit(EXIT_FAILURE); 1008 } 1009 if (export_name) { 1010 nbd_export_set_name(exp, export_name); 1011 nbd_export_set_description(exp, export_description); 1012 newproto = true; 1013 } else if (export_description) { 1014 error_report("Export description requires an export name"); 1015 exit(EXIT_FAILURE); 1016 } 1017 1018 if (device) { 1019 int ret; 1020 1021 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 1022 if (ret != 0) { 1023 error_report("Failed to create client thread: %s", strerror(ret)); 1024 exit(EXIT_FAILURE); 1025 } 1026 } else { 1027 /* Shut up GCC warnings. */ 1028 memset(&client_thread, 0, sizeof(client_thread)); 1029 } 1030 1031 nbd_update_server_watch(); 1032 1033 /* now when the initialization is (almost) complete, chdir("/") 1034 * to free any busy filesystems */ 1035 if (chdir("/") < 0) { 1036 error_report("Could not chdir to root directory: %s", 1037 strerror(errno)); 1038 exit(EXIT_FAILURE); 1039 } 1040 1041 if (fork_process) { 1042 dup2(old_stderr, STDERR_FILENO); 1043 close(old_stderr); 1044 } 1045 1046 state = RUNNING; 1047 do { 1048 main_loop_wait(false); 1049 if (state == TERMINATE) { 1050 state = TERMINATING; 1051 nbd_export_close(exp); 1052 nbd_export_put(exp); 1053 exp = NULL; 1054 } 1055 } while (state != TERMINATED); 1056 1057 blk_unref(blk); 1058 if (sockpath) { 1059 unlink(sockpath); 1060 } 1061 1062 qemu_opts_del(sn_opts); 1063 1064 if (device) { 1065 void *ret; 1066 pthread_join(client_thread, &ret); 1067 exit(ret != NULL); 1068 } else { 1069 exit(EXIT_SUCCESS); 1070 } 1071 } 1072