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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 "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#define QEMU_NBD_OPT_FORK 263
52
53#define MBR_SIZE 512
54
55static NBDExport *exp;
56static bool newproto;
57static int verbose;
58static char *srcpath;
59static SocketAddress *saddr;
60static int persistent = 0;
61static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
62static int shared = 1;
63static int nb_fds;
64static QIOChannelSocket *server_ioc;
65static int server_watch = -1;
66static QCryptoTLSCreds *tlscreds;
67
68static void usage(const char *name)
69{
70 (printf) (
71"Usage: %s [OPTIONS] FILE\n"
72"QEMU Disk Network Block Device Server\n"
73"\n"
74" -h, --help display this help and exit\n"
75" -V, --version output version information and exit\n"
76"\n"
77"Connection properties:\n"
78" -p, --port=PORT port to listen on (default `%d')\n"
79" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
80" -k, --socket=PATH path to the unix socket\n"
81" (default '"SOCKET_PATH"')\n"
82" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
83" -t, --persistent don't exit on the last connection\n"
84" -v, --verbose display extra debugging information\n"
85" -x, --export-name=NAME expose export by name\n"
86" -D, --description=TEXT with -x, also export a human-readable description\n"
87"\n"
88"Exposing part of the image:\n"
89" -o, --offset=OFFSET offset into the image\n"
90" -P, --partition=NUM only expose partition NUM\n"
91"\n"
92"General purpose options:\n"
93" --object type,id=ID,... define an object such as 'secret' for providing\n"
94" passwords and/or encryption keys\n"
95" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
96" specify tracing options\n"
97" --fork fork off the server process and exit the parent\n"
98" once the server is running\n"
99#ifdef __linux__
100"Kernel NBD client support:\n"
101" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
102" -d, --disconnect disconnect the specified device\n"
103"\n"
104#endif
105"\n"
106"Block device options:\n"
107" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
108" -r, --read-only export read-only\n"
109" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
110" file with backing_file=FILE, redirect the write to\n"
111" the temporary one\n"
112" -l, --load-snapshot=SNAPSHOT_PARAM\n"
113" load an internal snapshot inside FILE and export it\n"
114" as an read-only device, SNAPSHOT_PARAM format is\n"
115" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
116" '[ID_OR_NAME]'\n"
117" -n, --nocache disable host cache\n"
118" --cache=MODE set cache mode (none, writeback, ...)\n"
119" --aio=MODE set AIO mode (native or threads)\n"
120" --discard=MODE set discard mode (ignore, unmap)\n"
121" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
122" --image-opts treat FILE as a full set of image options\n"
123"\n"
124"Report bugs to <qemu-devel@nongnu.org>\n"
125 , name, NBD_DEFAULT_PORT, "DEVICE");
126}
127
128static void version(const char *name)
129{
130 printf(
131"%s version 0.0.1\n"
132"Written by Anthony Liguori.\n"
133"\n"
134"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
135"This is free software; see the source for copying conditions. There is NO\n"
136"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
137 , name);
138}
139
140struct partition_record
141{
142 uint8_t bootable;
143 uint8_t start_head;
144 uint32_t start_cylinder;
145 uint8_t start_sector;
146 uint8_t system;
147 uint8_t end_head;
148 uint8_t end_cylinder;
149 uint8_t end_sector;
150 uint32_t start_sector_abs;
151 uint32_t nb_sectors_abs;
152};
153
154static void read_partition(uint8_t *p, struct partition_record *r)
155{
156 r->bootable = p[0];
157 r->start_head = p[1];
158 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
159 r->start_sector = p[2] & 0x3f;
160 r->system = p[4];
161 r->end_head = p[5];
162 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
163 r->end_sector = p[6] & 0x3f;
164
165 r->start_sector_abs = ldl_le_p(p + 8);
166 r->nb_sectors_abs = ldl_le_p(p + 12);
167}
168
169static int find_partition(BlockBackend *blk, int partition,
170 off_t *offset, off_t *size)
171{
172 struct partition_record mbr[4];
173 uint8_t data[MBR_SIZE];
174 int i;
175 int ext_partnum = 4;
176 int ret;
177
178 ret = blk_pread(blk, 0, data, sizeof(data));
179 if (ret < 0) {
180 error_report("error while reading: %s", strerror(-ret));
181 exit(EXIT_FAILURE);
182 }
183
184 if (data[510] != 0x55 || data[511] != 0xaa) {
185 return -EINVAL;
186 }
187
188 for (i = 0; i < 4; i++) {
189 read_partition(&data[446 + 16 * i], &mbr[i]);
190
191 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
192 continue;
193 }
194
195 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
196 struct partition_record ext[4];
197 uint8_t data1[MBR_SIZE];
198 int j;
199
200 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
201 data1, sizeof(data1));
202 if (ret < 0) {
203 error_report("error while reading: %s", strerror(-ret));
204 exit(EXIT_FAILURE);
205 }
206
207 for (j = 0; j < 4; j++) {
208 read_partition(&data1[446 + 16 * j], &ext[j]);
209 if (!ext[j].system || !ext[j].nb_sectors_abs) {
210 continue;
211 }
212
213 if ((ext_partnum + j + 1) == partition) {
214 *offset = (uint64_t)ext[j].start_sector_abs << 9;
215 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
216 return 0;
217 }
218 }
219 ext_partnum += 4;
220 } else if ((i + 1) == partition) {
221 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
222 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
223 return 0;
224 }
225 }
226
227 return -ENOENT;
228}
229
230static void termsig_handler(int signum)
231{
232 atomic_cmpxchg(&state, RUNNING, TERMINATE);
233 qemu_notify_event();
234}
235
236
237static void *show_parts(void *arg)
238{
239 char *device = arg;
240 int nbd;
241
242
243
244
245
246
247 nbd = open(device, O_RDWR);
248 if (nbd >= 0) {
249 close(nbd);
250 }
251 return NULL;
252}
253
254static void *nbd_client_thread(void *arg)
255{
256 char *device = arg;
257 off_t size;
258 uint16_t nbdflags;
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, &nbdflags,
274 NULL, NULL, NULL,
275 &size, &local_error);
276 if (ret < 0) {
277 if (local_error) {
278 error_report_err(local_error);
279 }
280 goto out_socket;
281 }
282
283 fd = open(device, O_RDWR);
284 if (fd < 0) {
285
286 error_report("Failed to open %s: %m", device);
287 goto out_socket;
288 }
289
290 ret = nbd_init(fd, sioc, nbdflags, size);
291 if (ret < 0) {
292 goto out_fd;
293 }
294
295
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
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
315out_fd:
316 close(fd);
317out_socket:
318 object_unref(OBJECT(sioc));
319out:
320 kill(getpid(), SIGTERM);
321 return (void *) EXIT_FAILURE;
322}
323
324static int nbd_can_accept(void)
325{
326 return nb_fds < shared;
327}
328
329static void nbd_export_closed(NBDExport *exp)
330{
331 assert(state == TERMINATING);
332 state = TERMINATED;
333}
334
335static void nbd_update_server_watch(void);
336
337static void nbd_client_closed(NBDClient *client)
338{
339 nb_fds--;
340 if (nb_fds == 0 && !persistent && state == RUNNING) {
341 state = TERMINATE;
342 }
343 nbd_update_server_watch();
344 nbd_client_put(client);
345}
346
347static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
348{
349 QIOChannelSocket *cioc;
350
351 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
352 NULL);
353 if (!cioc) {
354 return TRUE;
355 }
356
357 if (state >= TERMINATE) {
358 object_unref(OBJECT(cioc));
359 return TRUE;
360 }
361
362 nb_fds++;
363 nbd_update_server_watch();
364 nbd_client_new(newproto ? NULL : exp, cioc,
365 tlscreds, NULL, nbd_client_closed);
366 object_unref(OBJECT(cioc));
367
368 return TRUE;
369}
370
371static void nbd_update_server_watch(void)
372{
373 if (nbd_can_accept()) {
374 if (server_watch == -1) {
375 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
376 G_IO_IN,
377 nbd_accept,
378 NULL, NULL);
379 }
380 } else {
381 if (server_watch != -1) {
382 g_source_remove(server_watch);
383 server_watch = -1;
384 }
385 }
386}
387
388
389static SocketAddress *nbd_build_socket_address(const char *sockpath,
390 const char *bindto,
391 const char *port)
392{
393 SocketAddress *saddr;
394
395 saddr = g_new0(SocketAddress, 1);
396 if (sockpath) {
397 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
398 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
399 saddr->u.q_unix.data->path = g_strdup(sockpath);
400 } else {
401 InetSocketAddress *inet;
402 saddr->type = SOCKET_ADDRESS_KIND_INET;
403 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
404 inet->host = g_strdup(bindto);
405 if (port) {
406 inet->port = g_strdup(port);
407 } else {
408 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
409 }
410 }
411
412 return saddr;
413}
414
415
416static QemuOptsList file_opts = {
417 .name = "file",
418 .implied_opt_name = "file",
419 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
420 .desc = {
421
422 { }
423 },
424};
425
426static QemuOptsList qemu_object_opts = {
427 .name = "object",
428 .implied_opt_name = "qom-type",
429 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
430 .desc = {
431 { }
432 },
433};
434
435
436
437static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
438{
439 Object *obj;
440 QCryptoTLSCreds *creds;
441
442 obj = object_resolve_path_component(
443 object_get_objects_root(), id);
444 if (!obj) {
445 error_setg(errp, "No TLS credentials with id '%s'",
446 id);
447 return NULL;
448 }
449 creds = (QCryptoTLSCreds *)
450 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
451 if (!creds) {
452 error_setg(errp, "Object with id '%s' is not TLS credentials",
453 id);
454 return NULL;
455 }
456
457 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
458 error_setg(errp,
459 "Expecting TLS credentials with a server endpoint");
460 return NULL;
461 }
462 object_ref(obj);
463 return creds;
464}
465
466
467int main(int argc, char **argv)
468{
469 BlockBackend *blk;
470 BlockDriverState *bs;
471 off_t dev_offset = 0;
472 uint16_t nbdflags = 0;
473 bool disconnect = false;
474 const char *bindto = "0.0.0.0";
475 const char *port = NULL;
476 char *sockpath = NULL;
477 char *device = NULL;
478 off_t fd_size;
479 QemuOpts *sn_opts = NULL;
480 const char *sn_id_or_name = NULL;
481 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
482 struct option lopt[] = {
483 { "help", no_argument, NULL, 'h' },
484 { "version", no_argument, NULL, 'V' },
485 { "bind", required_argument, NULL, 'b' },
486 { "port", required_argument, NULL, 'p' },
487 { "socket", required_argument, NULL, 'k' },
488 { "offset", required_argument, NULL, 'o' },
489 { "read-only", no_argument, NULL, 'r' },
490 { "partition", required_argument, NULL, 'P' },
491 { "connect", required_argument, NULL, 'c' },
492 { "disconnect", no_argument, NULL, 'd' },
493 { "snapshot", no_argument, NULL, 's' },
494 { "load-snapshot", required_argument, NULL, 'l' },
495 { "nocache", no_argument, NULL, 'n' },
496 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
497 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
498 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
499 { "detect-zeroes", required_argument, NULL,
500 QEMU_NBD_OPT_DETECT_ZEROES },
501 { "shared", required_argument, NULL, 'e' },
502 { "format", required_argument, NULL, 'f' },
503 { "persistent", no_argument, NULL, 't' },
504 { "verbose", no_argument, NULL, 'v' },
505 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
506 { "export-name", required_argument, NULL, 'x' },
507 { "description", required_argument, NULL, 'D' },
508 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
509 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
510 { "trace", required_argument, NULL, 'T' },
511 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
512 { NULL, 0, NULL, 0 }
513 };
514 int ch;
515 int opt_ind = 0;
516 char *end;
517 int flags = BDRV_O_RDWR;
518 int partition = -1;
519 int ret = 0;
520 bool seen_cache = false;
521 bool seen_discard = false;
522 bool seen_aio = false;
523 pthread_t client_thread;
524 const char *fmt = NULL;
525 Error *local_err = NULL;
526 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
527 QDict *options = NULL;
528 const char *export_name = NULL;
529 const char *export_description = NULL;
530 const char *tlscredsid = NULL;
531 bool imageOpts = false;
532 bool writethrough = true;
533 char *trace_file = NULL;
534 bool fork_process = false;
535 int old_stderr = -1;
536
537
538
539
540 struct sigaction sa_sigterm;
541 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
542 sa_sigterm.sa_handler = termsig_handler;
543 sigaction(SIGTERM, &sa_sigterm, NULL);
544
545 module_call_init(MODULE_INIT_TRACE);
546 qcrypto_init(&error_fatal);
547
548 module_call_init(MODULE_INIT_QOM);
549 qemu_add_opts(&qemu_object_opts);
550 qemu_add_opts(&qemu_trace_opts);
551 qemu_init_exec_dir(argv[0]);
552
553 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
554 switch (ch) {
555 case 's':
556 flags |= BDRV_O_SNAPSHOT;
557 break;
558 case 'n':
559 optarg = (char *) "none";
560
561 case QEMU_NBD_OPT_CACHE:
562 if (seen_cache) {
563 error_report("-n and --cache can only be specified once");
564 exit(EXIT_FAILURE);
565 }
566 seen_cache = true;
567 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
568 error_report("Invalid cache mode `%s'", optarg);
569 exit(EXIT_FAILURE);
570 }
571 break;
572 case QEMU_NBD_OPT_AIO:
573 if (seen_aio) {
574 error_report("--aio can only be specified once");
575 exit(EXIT_FAILURE);
576 }
577 seen_aio = true;
578 if (!strcmp(optarg, "native")) {
579 flags |= BDRV_O_NATIVE_AIO;
580 } else if (!strcmp(optarg, "threads")) {
581
582 } else {
583 error_report("invalid aio mode `%s'", optarg);
584 exit(EXIT_FAILURE);
585 }
586 break;
587 case QEMU_NBD_OPT_DISCARD:
588 if (seen_discard) {
589 error_report("--discard can only be specified once");
590 exit(EXIT_FAILURE);
591 }
592 seen_discard = true;
593 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
594 error_report("Invalid discard mode `%s'", optarg);
595 exit(EXIT_FAILURE);
596 }
597 break;
598 case QEMU_NBD_OPT_DETECT_ZEROES:
599 detect_zeroes =
600 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
601 optarg,
602 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
603 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
604 &local_err);
605 if (local_err) {
606 error_reportf_err(local_err,
607 "Failed to parse detect_zeroes mode: ");
608 exit(EXIT_FAILURE);
609 }
610 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
611 !(flags & BDRV_O_UNMAP)) {
612 error_report("setting detect-zeroes to unmap is not allowed "
613 "without setting discard operation to unmap");
614 exit(EXIT_FAILURE);
615 }
616 break;
617 case 'b':
618 bindto = optarg;
619 break;
620 case 'p':
621 port = optarg;
622 break;
623 case 'o':
624 dev_offset = strtoll (optarg, &end, 0);
625 if (*end) {
626 error_report("Invalid offset `%s'", optarg);
627 exit(EXIT_FAILURE);
628 }
629 if (dev_offset < 0) {
630 error_report("Offset must be positive `%s'", optarg);
631 exit(EXIT_FAILURE);
632 }
633 break;
634 case 'l':
635 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
636 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
637 optarg, false);
638 if (!sn_opts) {
639 error_report("Failed in parsing snapshot param `%s'",
640 optarg);
641 exit(EXIT_FAILURE);
642 }
643 } else {
644 sn_id_or_name = optarg;
645 }
646
647 case 'r':
648 nbdflags |= NBD_FLAG_READ_ONLY;
649 flags &= ~BDRV_O_RDWR;
650 break;
651 case 'P':
652 partition = strtol(optarg, &end, 0);
653 if (*end) {
654 error_report("Invalid partition `%s'", optarg);
655 exit(EXIT_FAILURE);
656 }
657 if (partition < 1 || partition > 8) {
658 error_report("Invalid partition %d", partition);
659 exit(EXIT_FAILURE);
660 }
661 break;
662 case 'k':
663 sockpath = optarg;
664 if (sockpath[0] != '/') {
665 error_report("socket path must be absolute");
666 exit(EXIT_FAILURE);
667 }
668 break;
669 case 'd':
670 disconnect = true;
671 break;
672 case 'c':
673 device = optarg;
674 break;
675 case 'e':
676 shared = strtol(optarg, &end, 0);
677 if (*end) {
678 error_report("Invalid shared device number '%s'", optarg);
679 exit(EXIT_FAILURE);
680 }
681 if (shared < 1) {
682 error_report("Shared device number must be greater than 0");
683 exit(EXIT_FAILURE);
684 }
685 break;
686 case 'f':
687 fmt = optarg;
688 break;
689 case 't':
690 persistent = 1;
691 break;
692 case 'x':
693 export_name = optarg;
694 break;
695 case 'D':
696 export_description = optarg;
697 break;
698 case 'v':
699 verbose = 1;
700 break;
701 case 'V':
702 version(argv[0]);
703 exit(0);
704 break;
705 case 'h':
706 usage(argv[0]);
707 exit(0);
708 break;
709 case '?':
710 error_report("Try `%s --help' for more information.", argv[0]);
711 exit(EXIT_FAILURE);
712 case QEMU_NBD_OPT_OBJECT: {
713 QemuOpts *opts;
714 opts = qemu_opts_parse_noisily(&qemu_object_opts,
715 optarg, true);
716 if (!opts) {
717 exit(EXIT_FAILURE);
718 }
719 } break;
720 case QEMU_NBD_OPT_TLSCREDS:
721 tlscredsid = optarg;
722 break;
723 case QEMU_NBD_OPT_IMAGE_OPTS:
724 imageOpts = true;
725 break;
726 case 'T':
727 g_free(trace_file);
728 trace_file = trace_opt_parse(optarg);
729 break;
730 case QEMU_NBD_OPT_FORK:
731 fork_process = true;
732 break;
733 }
734 }
735
736 if ((argc - optind) != 1) {
737 error_report("Invalid number of arguments");
738 error_printf("Try `%s --help' for more information.\n", argv[0]);
739 exit(EXIT_FAILURE);
740 }
741
742 if (qemu_opts_foreach(&qemu_object_opts,
743 user_creatable_add_opts_foreach,
744 NULL, NULL)) {
745 exit(EXIT_FAILURE);
746 }
747
748 if (!trace_init_backends()) {
749 exit(1);
750 }
751 trace_init_file(trace_file);
752 qemu_set_log(LOG_TRACE);
753
754 if (tlscredsid) {
755 if (sockpath) {
756 error_report("TLS is only supported with IPv4/IPv6");
757 exit(EXIT_FAILURE);
758 }
759 if (device) {
760 error_report("TLS is not supported with a host device");
761 exit(EXIT_FAILURE);
762 }
763 if (!export_name) {
764
765
766 export_name = "";
767 }
768 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
769 if (local_err) {
770 error_report("Failed to get TLS creds %s",
771 error_get_pretty(local_err));
772 exit(EXIT_FAILURE);
773 }
774 }
775
776 if (disconnect) {
777 int nbdfd = open(argv[optind], O_RDWR);
778 if (nbdfd < 0) {
779 error_report("Cannot open %s: %s", argv[optind],
780 strerror(errno));
781 exit(EXIT_FAILURE);
782 }
783 nbd_disconnect(nbdfd);
784
785 close(nbdfd);
786
787 printf("%s disconnected\n", argv[optind]);
788
789 return 0;
790 }
791
792 if ((device && !verbose) || fork_process) {
793 int stderr_fd[2];
794 pid_t pid;
795 int ret;
796
797 if (qemu_pipe(stderr_fd) < 0) {
798 error_report("Error setting up communication pipe: %s",
799 strerror(errno));
800 exit(EXIT_FAILURE);
801 }
802
803
804
805
806 pid = fork();
807 if (pid < 0) {
808 error_report("Failed to fork: %s", strerror(errno));
809 exit(EXIT_FAILURE);
810 } else if (pid == 0) {
811 close(stderr_fd[0]);
812 ret = qemu_daemon(1, 0);
813
814
815 old_stderr = dup(STDERR_FILENO);
816 dup2(stderr_fd[1], STDERR_FILENO);
817 if (ret < 0) {
818 error_report("Failed to daemonize: %s", strerror(errno));
819 exit(EXIT_FAILURE);
820 }
821
822
823 close(stderr_fd[1]);
824 } else {
825 bool errors = false;
826 char *buf;
827
828
829
830
831 close(stderr_fd[1]);
832 buf = g_malloc(1024);
833 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
834 errors = true;
835 ret = qemu_write_full(STDERR_FILENO, buf, ret);
836 if (ret < 0) {
837 exit(EXIT_FAILURE);
838 }
839 }
840 if (ret < 0) {
841 error_report("Cannot read from daemon: %s",
842 strerror(errno));
843 exit(EXIT_FAILURE);
844 }
845
846
847
848
849 exit(errors);
850 }
851 }
852
853 if (device != NULL && sockpath == NULL) {
854 sockpath = g_malloc(128);
855 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
856 }
857
858 saddr = nbd_build_socket_address(sockpath, bindto, port);
859
860 if (qemu_init_main_loop(&local_err)) {
861 error_report_err(local_err);
862 exit(EXIT_FAILURE);
863 }
864 bdrv_init();
865 atexit(bdrv_close_all);
866
867 srcpath = argv[optind];
868 if (imageOpts) {
869 QemuOpts *opts;
870 if (fmt) {
871 error_report("--image-opts and -f are mutually exclusive");
872 exit(EXIT_FAILURE);
873 }
874 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
875 if (!opts) {
876 qemu_opts_reset(&file_opts);
877 exit(EXIT_FAILURE);
878 }
879 options = qemu_opts_to_qdict(opts, NULL);
880 qemu_opts_reset(&file_opts);
881 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
882 } else {
883 if (fmt) {
884 options = qdict_new();
885 qdict_put(options, "driver", qstring_from_str(fmt));
886 }
887 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
888 }
889
890 if (!blk) {
891 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
892 argv[optind]);
893 exit(EXIT_FAILURE);
894 }
895 bs = blk_bs(blk);
896
897 blk_set_enable_write_cache(blk, !writethrough);
898
899 if (sn_opts) {
900 ret = bdrv_snapshot_load_tmp(bs,
901 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
902 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
903 &local_err);
904 } else if (sn_id_or_name) {
905 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
906 &local_err);
907 }
908 if (ret < 0) {
909 error_reportf_err(local_err, "Failed to load snapshot: ");
910 exit(EXIT_FAILURE);
911 }
912
913 bs->detect_zeroes = detect_zeroes;
914 fd_size = blk_getlength(blk);
915 if (fd_size < 0) {
916 error_report("Failed to determine the image length: %s",
917 strerror(-fd_size));
918 exit(EXIT_FAILURE);
919 }
920
921 if (dev_offset >= fd_size) {
922 error_report("Offset (%lld) has to be smaller than the image size "
923 "(%lld)",
924 (long long int)dev_offset, (long long int)fd_size);
925 exit(EXIT_FAILURE);
926 }
927 fd_size -= dev_offset;
928
929 if (partition != -1) {
930 ret = find_partition(blk, partition, &dev_offset, &fd_size);
931 if (ret < 0) {
932 error_report("Could not find partition %d: %s", partition,
933 strerror(-ret));
934 exit(EXIT_FAILURE);
935 }
936 }
937
938 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
939 writethrough, NULL, &local_err);
940 if (!exp) {
941 error_report_err(local_err);
942 exit(EXIT_FAILURE);
943 }
944 if (export_name) {
945 nbd_export_set_name(exp, export_name);
946 nbd_export_set_description(exp, export_description);
947 newproto = true;
948 } else if (export_description) {
949 error_report("Export description requires an export name");
950 exit(EXIT_FAILURE);
951 }
952
953 server_ioc = qio_channel_socket_new();
954 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
955 object_unref(OBJECT(server_ioc));
956 error_report_err(local_err);
957 return 1;
958 }
959
960 if (device) {
961 int ret;
962
963 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
964 if (ret != 0) {
965 error_report("Failed to create client thread: %s", strerror(ret));
966 exit(EXIT_FAILURE);
967 }
968 } else {
969
970 memset(&client_thread, 0, sizeof(client_thread));
971 }
972
973 nbd_update_server_watch();
974
975
976
977 if (chdir("/") < 0) {
978 error_report("Could not chdir to root directory: %s",
979 strerror(errno));
980 exit(EXIT_FAILURE);
981 }
982
983 if (fork_process) {
984 dup2(old_stderr, STDERR_FILENO);
985 close(old_stderr);
986 }
987
988 state = RUNNING;
989 do {
990 main_loop_wait(false);
991 if (state == TERMINATE) {
992 state = TERMINATING;
993 nbd_export_close(exp);
994 nbd_export_put(exp);
995 exp = NULL;
996 }
997 } while (state != TERMINATED);
998
999 blk_unref(blk);
1000 if (sockpath) {
1001 unlink(sockpath);
1002 }
1003
1004 qemu_opts_del(sn_opts);
1005
1006 if (device) {
1007 void *ret;
1008 pthread_join(client_thread, &ret);
1009 exit(ret != NULL);
1010 } else {
1011 exit(EXIT_SUCCESS);
1012 }
1013}
1014
