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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
49static NBDExport *exp;
50static bool newproto;
51static int verbose;
52static char *srcpath;
53static SocketAddress *saddr;
54static int persistent = 0;
55static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
56static int shared = 1;
57static int nb_fds;
58static QIOChannelSocket *server_ioc;
59static int server_watch = -1;
60static QCryptoTLSCreds *tlscreds;
61
62static 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
117static 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
129struct 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
143static 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
158static 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
216static void termsig_handler(int signum)
217{
218 atomic_cmpxchg(&state, RUNNING, TERMINATE);
219 qemu_notify_event();
220}
221
222
223static void *show_parts(void *arg)
224{
225 char *device = arg;
226 int nbd;
227
228
229
230
231
232
233 nbd = open(device, O_RDWR);
234 if (nbd >= 0) {
235 close(nbd);
236 }
237 return NULL;
238}
239
240static 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
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
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
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
301out_fd:
302 close(fd);
303out_socket:
304 object_unref(OBJECT(sioc));
305out:
306 kill(getpid(), SIGTERM);
307 return (void *) EXIT_FAILURE;
308}
309
310static int nbd_can_accept(void)
311{
312 return nb_fds < shared;
313}
314
315static void nbd_export_closed(NBDExport *exp)
316{
317 assert(state == TERMINATING);
318 state = TERMINATED;
319}
320
321static void nbd_update_server_watch(void);
322
323static 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
333static 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
357static 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
375static 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
402static QemuOptsList file_opts = {
403 .name = "file",
404 .implied_opt_name = "file",
405 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
406 .desc = {
407
408 { }
409 },
410};
411
412static 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
423static 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
453int 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
517
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
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
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
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, NULL)) {
715 exit(EXIT_FAILURE);
716 }
717
718 if (tlscredsid) {
719 if (sockpath) {
720 error_report("TLS is only supported with IPv4/IPv6");
721 exit(EXIT_FAILURE);
722 }
723 if (device) {
724 error_report("TLS is not supported with a host device");
725 exit(EXIT_FAILURE);
726 }
727 if (!export_name) {
728
729
730 export_name = "";
731 }
732 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
733 if (local_err) {
734 error_report("Failed to get TLS creds %s",
735 error_get_pretty(local_err));
736 exit(EXIT_FAILURE);
737 }
738 }
739
740 if (disconnect) {
741 int nbdfd = open(argv[optind], O_RDWR);
742 if (nbdfd < 0) {
743 error_report("Cannot open %s: %s", argv[optind],
744 strerror(errno));
745 exit(EXIT_FAILURE);
746 }
747 nbd_disconnect(nbdfd);
748
749 close(nbdfd);
750
751 printf("%s disconnected\n", argv[optind]);
752
753 return 0;
754 }
755
756 if (device && !verbose) {
757 int stderr_fd[2];
758 pid_t pid;
759 int ret;
760
761 if (qemu_pipe(stderr_fd) < 0) {
762 error_report("Error setting up communication pipe: %s",
763 strerror(errno));
764 exit(EXIT_FAILURE);
765 }
766
767
768
769
770 pid = fork();
771 if (pid < 0) {
772 error_report("Failed to fork: %s", strerror(errno));
773 exit(EXIT_FAILURE);
774 } else if (pid == 0) {
775 close(stderr_fd[0]);
776 ret = qemu_daemon(1, 0);
777
778
779 dup2(stderr_fd[1], STDERR_FILENO);
780 if (ret < 0) {
781 error_report("Failed to daemonize: %s", strerror(errno));
782 exit(EXIT_FAILURE);
783 }
784
785
786 close(stderr_fd[1]);
787 } else {
788 bool errors = false;
789 char *buf;
790
791
792
793
794 close(stderr_fd[1]);
795 buf = g_malloc(1024);
796 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
797 errors = true;
798 ret = qemu_write_full(STDERR_FILENO, buf, ret);
799 if (ret < 0) {
800 exit(EXIT_FAILURE);
801 }
802 }
803 if (ret < 0) {
804 error_report("Cannot read from daemon: %s",
805 strerror(errno));
806 exit(EXIT_FAILURE);
807 }
808
809
810
811
812 exit(errors);
813 }
814 }
815
816 if (device != NULL && sockpath == NULL) {
817 sockpath = g_malloc(128);
818 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
819 }
820
821 saddr = nbd_build_socket_address(sockpath, bindto, port);
822
823 if (qemu_init_main_loop(&local_err)) {
824 error_report_err(local_err);
825 exit(EXIT_FAILURE);
826 }
827 bdrv_init();
828 atexit(bdrv_close_all);
829
830 srcpath = argv[optind];
831 if (imageOpts) {
832 QemuOpts *opts;
833 if (fmt) {
834 error_report("--image-opts and -f are mutually exclusive");
835 exit(EXIT_FAILURE);
836 }
837 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
838 if (!opts) {
839 qemu_opts_reset(&file_opts);
840 exit(EXIT_FAILURE);
841 }
842 options = qemu_opts_to_qdict(opts, NULL);
843 qemu_opts_reset(&file_opts);
844 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
845 } else {
846 if (fmt) {
847 options = qdict_new();
848 qdict_put(options, "driver", qstring_from_str(fmt));
849 }
850 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
851 }
852
853 if (!blk) {
854 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
855 argv[optind]);
856 exit(EXIT_FAILURE);
857 }
858 bs = blk_bs(blk);
859
860 blk_set_enable_write_cache(blk, !writethrough);
861
862 if (sn_opts) {
863 ret = bdrv_snapshot_load_tmp(bs,
864 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
865 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
866 &local_err);
867 } else if (sn_id_or_name) {
868 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
869 &local_err);
870 }
871 if (ret < 0) {
872 error_reportf_err(local_err, "Failed to load snapshot: ");
873 exit(EXIT_FAILURE);
874 }
875
876 bs->detect_zeroes = detect_zeroes;
877 fd_size = blk_getlength(blk);
878 if (fd_size < 0) {
879 error_report("Failed to determine the image length: %s",
880 strerror(-fd_size));
881 exit(EXIT_FAILURE);
882 }
883
884 if (partition != -1) {
885 ret = find_partition(blk, partition, &dev_offset, &fd_size);
886 if (ret < 0) {
887 error_report("Could not find partition %d: %s", partition,
888 strerror(-ret));
889 exit(EXIT_FAILURE);
890 }
891 }
892
893 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed,
894 &local_err);
895 if (!exp) {
896 error_report_err(local_err);
897 exit(EXIT_FAILURE);
898 }
899 if (export_name) {
900 nbd_export_set_name(exp, export_name);
901 newproto = true;
902 }
903
904 server_ioc = qio_channel_socket_new();
905 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
906 object_unref(OBJECT(server_ioc));
907 error_report_err(local_err);
908 return 1;
909 }
910
911 if (device) {
912 int ret;
913
914 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
915 if (ret != 0) {
916 error_report("Failed to create client thread: %s", strerror(ret));
917 exit(EXIT_FAILURE);
918 }
919 } else {
920
921 memset(&client_thread, 0, sizeof(client_thread));
922 }
923
924 nbd_update_server_watch();
925
926
927
928 if (chdir("/") < 0) {
929 error_report("Could not chdir to root directory: %s",
930 strerror(errno));
931 exit(EXIT_FAILURE);
932 }
933
934 state = RUNNING;
935 do {
936 main_loop_wait(false);
937 if (state == TERMINATE) {
938 state = TERMINATING;
939 nbd_export_close(exp);
940 nbd_export_put(exp);
941 exp = NULL;
942 }
943 } while (state != TERMINATED);
944
945 blk_unref(blk);
946 if (sockpath) {
947 unlink(sockpath);
948 }
949
950 qemu_opts_del(sn_opts);
951
952 if (device) {
953 void *ret;
954 pthread_join(client_thread, &ret);
955 exit(ret != NULL);
956 } else {
957 exit(EXIT_SUCCESS);
958 }
959}
960
