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19#include "qemu/osdep.h"
20#include <getopt.h>
21#include <libgen.h>
22#include <pthread.h>
23
24#include "qemu-common.h"
25#include "qapi/error.h"
26#include "qemu/cutils.h"
27#include "sysemu/block-backend.h"
28#include "sysemu/runstate.h"
29#include "block/block_int.h"
30#include "block/nbd.h"
31#include "qemu/main-loop.h"
32#include "qemu/module.h"
33#include "qemu/option.h"
34#include "qemu/error-report.h"
35#include "qemu/config-file.h"
36#include "qemu/bswap.h"
37#include "qemu/log.h"
38#include "qemu/systemd.h"
39#include "block/snapshot.h"
40#include "qapi/qmp/qdict.h"
41#include "qapi/qmp/qstring.h"
42#include "qom/object_interfaces.h"
43#include "io/channel-socket.h"
44#include "io/net-listener.h"
45#include "crypto/init.h"
46#include "trace/control.h"
47#include "qemu-version.h"
48
49#ifdef __linux__
50#define HAVE_NBD_DEVICE 1
51#else
52#define HAVE_NBD_DEVICE 0
53#endif
54
55#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
56#define QEMU_NBD_OPT_CACHE 256
57#define QEMU_NBD_OPT_AIO 257
58#define QEMU_NBD_OPT_DISCARD 258
59#define QEMU_NBD_OPT_DETECT_ZEROES 259
60#define QEMU_NBD_OPT_OBJECT 260
61#define QEMU_NBD_OPT_TLSCREDS 261
62#define QEMU_NBD_OPT_IMAGE_OPTS 262
63#define QEMU_NBD_OPT_FORK 263
64#define QEMU_NBD_OPT_TLSAUTHZ 264
65#define QEMU_NBD_OPT_PID_FILE 265
66
67#define MBR_SIZE 512
68
69static int verbose;
70static char *srcpath;
71static SocketAddress *saddr;
72static int persistent = 0;
73static enum { RUNNING, TERMINATE, TERMINATED } state;
74static int shared = 1;
75static int nb_fds;
76static QIONetListener *server;
77static QCryptoTLSCreds *tlscreds;
78static const char *tlsauthz;
79
80static void usage(const char *name)
81{
82 (printf) (
83"Usage: %s [OPTIONS] FILE\n"
84" or: %s -L [OPTIONS]\n"
85"QEMU Disk Network Block Device Utility\n"
86"\n"
87" -h, --help display this help and exit\n"
88" -V, --version output version information and exit\n"
89"\n"
90"Connection properties:\n"
91" -p, --port=PORT port to listen on (default `%d')\n"
92" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
93" -k, --socket=PATH path to the unix socket\n"
94" (default '"SOCKET_PATH"')\n"
95" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
96" -t, --persistent don't exit on the last connection\n"
97" -v, --verbose display extra debugging information\n"
98" -x, --export-name=NAME expose export by name (default is empty string)\n"
99" -D, --description=TEXT export a human-readable description\n"
100"\n"
101"Exposing part of the image:\n"
102" -o, --offset=OFFSET offset into the image\n"
103" -A, --allocation-depth expose the allocation depth\n"
104" -B, --bitmap=NAME expose a persistent dirty bitmap\n"
105"\n"
106"General purpose options:\n"
107" -L, --list list exports available from another NBD server\n"
108" --object type,id=ID,... define an object such as 'secret' for providing\n"
109" passwords and/or encryption keys\n"
110" --tls-creds=ID use id of an earlier --object to provide TLS\n"
111" --tls-authz=ID use id of an earlier --object to provide\n"
112" authorization\n"
113" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
114" specify tracing options\n"
115" --fork fork off the server process and exit the parent\n"
116" once the server is running\n"
117" --pid-file=PATH store the server's process ID in the given file\n"
118#if HAVE_NBD_DEVICE
119"\n"
120"Kernel NBD client support:\n"
121" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
122" -d, --disconnect disconnect the specified device\n"
123#endif
124"\n"
125"Block device options:\n"
126" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
127" -r, --read-only export read-only\n"
128" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
129" file with backing_file=FILE, redirect the write to\n"
130" the temporary one\n"
131" -l, --load-snapshot=SNAPSHOT_PARAM\n"
132" load an internal snapshot inside FILE and export it\n"
133" as an read-only device, SNAPSHOT_PARAM format is\n"
134" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
135" '[ID_OR_NAME]'\n"
136" -n, --nocache disable host cache\n"
137" --cache=MODE set cache mode (none, writeback, ...)\n"
138" --aio=MODE set AIO mode (native, io_uring or threads)\n"
139" --discard=MODE set discard mode (ignore, unmap)\n"
140" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
141" --image-opts treat FILE as a full set of image options\n"
142"\n"
143QEMU_HELP_BOTTOM "\n"
144 , name, name, NBD_DEFAULT_PORT, "DEVICE");
145}
146
147static void version(const char *name)
148{
149 printf(
150"%s " QEMU_FULL_VERSION "\n"
151"Written by Anthony Liguori.\n"
152"\n"
153QEMU_COPYRIGHT "\n"
154"This is free software; see the source for copying conditions. There is NO\n"
155"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
156 , name);
157}
158
159#ifdef CONFIG_POSIX
160
161
162
163
164void qemu_system_killed(int signum, pid_t pid)
165{
166 qatomic_cmpxchg(&state, RUNNING, TERMINATE);
167 qemu_notify_event();
168}
169#endif
170
171static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
172 const char *hostname)
173{
174 int ret = EXIT_FAILURE;
175 int rc;
176 Error *err = NULL;
177 QIOChannelSocket *sioc;
178 NBDExportInfo *list;
179 int i, j;
180
181 sioc = qio_channel_socket_new();
182 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
183 error_report_err(err);
184 goto out;
185 }
186 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
187 &err);
188 if (rc < 0) {
189 if (err) {
190 error_report_err(err);
191 }
192 goto out;
193 }
194 printf("exports available: %d\n", rc);
195 for (i = 0; i < rc; i++) {
196 printf(" export: '%s'\n", list[i].name);
197 if (list[i].description && *list[i].description) {
198 printf(" description: %s\n", list[i].description);
199 }
200 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
201 static const char *const flag_names[] = {
202 [NBD_FLAG_READ_ONLY_BIT] = "readonly",
203 [NBD_FLAG_SEND_FLUSH_BIT] = "flush",
204 [NBD_FLAG_SEND_FUA_BIT] = "fua",
205 [NBD_FLAG_ROTATIONAL_BIT] = "rotational",
206 [NBD_FLAG_SEND_TRIM_BIT] = "trim",
207 [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
208 [NBD_FLAG_SEND_DF_BIT] = "df",
209 [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
210 [NBD_FLAG_SEND_RESIZE_BIT] = "resize",
211 [NBD_FLAG_SEND_CACHE_BIT] = "cache",
212 [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero",
213 };
214
215 printf(" size: %" PRIu64 "\n", list[i].size);
216 printf(" flags: 0x%x (", list[i].flags);
217 for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
218 if (flag_names[bit] && (list[i].flags & (1 << bit))) {
219 printf(" %s", flag_names[bit]);
220 }
221 }
222 printf(" )\n");
223 }
224 if (list[i].min_block) {
225 printf(" min block: %u\n", list[i].min_block);
226 printf(" opt block: %u\n", list[i].opt_block);
227 printf(" max block: %u\n", list[i].max_block);
228 }
229 if (list[i].n_contexts) {
230 printf(" available meta contexts: %d\n", list[i].n_contexts);
231 for (j = 0; j < list[i].n_contexts; j++) {
232 printf(" %s\n", list[i].contexts[j]);
233 }
234 }
235 }
236 nbd_free_export_list(list, rc);
237
238 ret = EXIT_SUCCESS;
239 out:
240 object_unref(OBJECT(sioc));
241 return ret;
242}
243
244
245#if HAVE_NBD_DEVICE
246static void *show_parts(void *arg)
247{
248 char *device = arg;
249 int nbd;
250
251
252
253
254
255
256 nbd = open(device, O_RDWR);
257 if (nbd >= 0) {
258 close(nbd);
259 }
260 return NULL;
261}
262
263static void *nbd_client_thread(void *arg)
264{
265 char *device = arg;
266 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
267 QIOChannelSocket *sioc;
268 int fd = -1;
269 int ret = EXIT_FAILURE;
270 pthread_t show_parts_thread;
271 Error *local_error = NULL;
272
273 sioc = qio_channel_socket_new();
274 if (qio_channel_socket_connect_sync(sioc,
275 saddr,
276 &local_error) < 0) {
277 error_report_err(local_error);
278 goto out;
279 }
280
281 if (nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
282 NULL, NULL, NULL, &info, &local_error) < 0) {
283 if (local_error) {
284 error_report_err(local_error);
285 }
286 goto out;
287 }
288
289 fd = open(device, O_RDWR);
290 if (fd < 0) {
291
292 error_report("Failed to open %s: %m", device);
293 goto out;
294 }
295
296 if (nbd_init(fd, sioc, &info, &local_error) < 0) {
297 error_report_err(local_error);
298 goto out;
299 }
300
301
302 pthread_create(&show_parts_thread, NULL, show_parts, device);
303
304 if (verbose) {
305 fprintf(stderr, "NBD device %s is now connected to %s\n",
306 device, srcpath);
307 } else {
308
309 dup2(STDOUT_FILENO, STDERR_FILENO);
310 }
311
312 if (nbd_client(fd) < 0) {
313 goto out;
314 }
315
316 ret = EXIT_SUCCESS;
317
318 out:
319 if (fd >= 0) {
320 close(fd);
321 }
322 object_unref(OBJECT(sioc));
323 g_free(info.name);
324 kill(getpid(), SIGTERM);
325 return (void *) (intptr_t) ret;
326}
327#endif
328
329static int nbd_can_accept(void)
330{
331 return state == RUNNING && (shared == 0 || nb_fds < shared);
332}
333
334static void nbd_update_server_watch(void);
335
336static void nbd_client_closed(NBDClient *client, bool negotiated)
337{
338 nb_fds--;
339 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
340 state = TERMINATE;
341 }
342 nbd_update_server_watch();
343 nbd_client_put(client);
344}
345
346static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
347 gpointer opaque)
348{
349 if (state >= TERMINATE) {
350 return;
351 }
352
353 nb_fds++;
354 nbd_update_server_watch();
355 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
356}
357
358static void nbd_update_server_watch(void)
359{
360 if (nbd_can_accept()) {
361 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
362 } else {
363 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
364 }
365}
366
367
368static SocketAddress *nbd_build_socket_address(const char *sockpath,
369 const char *bindto,
370 const char *port)
371{
372 SocketAddress *saddr;
373
374 saddr = g_new0(SocketAddress, 1);
375 if (sockpath) {
376 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
377 saddr->u.q_unix.path = g_strdup(sockpath);
378 } else {
379 InetSocketAddress *inet;
380 saddr->type = SOCKET_ADDRESS_TYPE_INET;
381 inet = &saddr->u.inet;
382 inet->host = g_strdup(bindto);
383 if (port) {
384 inet->port = g_strdup(port);
385 } else {
386 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
387 }
388 }
389
390 return saddr;
391}
392
393
394static QemuOptsList file_opts = {
395 .name = "file",
396 .implied_opt_name = "file",
397 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
398 .desc = {
399
400 { }
401 },
402};
403
404static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
405 Error **errp)
406{
407 Object *obj;
408 QCryptoTLSCreds *creds;
409
410 obj = object_resolve_path_component(
411 object_get_objects_root(), id);
412 if (!obj) {
413 error_setg(errp, "No TLS credentials with id '%s'",
414 id);
415 return NULL;
416 }
417 creds = (QCryptoTLSCreds *)
418 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
419 if (!creds) {
420 error_setg(errp, "Object with id '%s' is not TLS credentials",
421 id);
422 return NULL;
423 }
424
425 if (list) {
426 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
427 error_setg(errp,
428 "Expecting TLS credentials with a client endpoint");
429 return NULL;
430 }
431 } else {
432 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
433 error_setg(errp,
434 "Expecting TLS credentials with a server endpoint");
435 return NULL;
436 }
437 }
438 object_ref(obj);
439 return creds;
440}
441
442static void setup_address_and_port(const char **address, const char **port)
443{
444 if (*address == NULL) {
445 *address = "0.0.0.0";
446 }
447
448 if (*port == NULL) {
449 *port = stringify(NBD_DEFAULT_PORT);
450 }
451}
452
453
454
455
456static const char *socket_activation_validate_opts(const char *device,
457 const char *sockpath,
458 const char *address,
459 const char *port,
460 bool list)
461{
462 if (device != NULL) {
463 return "NBD device can't be set when using socket activation";
464 }
465
466 if (sockpath != NULL) {
467 return "Unix socket can't be set when using socket activation";
468 }
469
470 if (address != NULL) {
471 return "The interface can't be set when using socket activation";
472 }
473
474 if (port != NULL) {
475 return "TCP port number can't be set when using socket activation";
476 }
477
478 if (list) {
479 return "List mode is incompatible with socket activation";
480 }
481
482 return NULL;
483}
484
485static void qemu_nbd_shutdown(void)
486{
487 job_cancel_sync_all();
488 blk_exp_close_all();
489 bdrv_close_all();
490}
491
492int main(int argc, char **argv)
493{
494 BlockBackend *blk;
495 BlockDriverState *bs;
496 uint64_t dev_offset = 0;
497 bool readonly = false;
498 bool disconnect = false;
499 const char *bindto = NULL;
500 const char *port = NULL;
501 char *sockpath = NULL;
502 char *device = NULL;
503 QemuOpts *sn_opts = NULL;
504 const char *sn_id_or_name = NULL;
505 const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:AB:L";
506 struct option lopt[] = {
507 { "help", no_argument, NULL, 'h' },
508 { "version", no_argument, NULL, 'V' },
509 { "bind", required_argument, NULL, 'b' },
510 { "port", required_argument, NULL, 'p' },
511 { "socket", required_argument, NULL, 'k' },
512 { "offset", required_argument, NULL, 'o' },
513 { "read-only", no_argument, NULL, 'r' },
514 { "allocation-depth", no_argument, NULL, 'A' },
515 { "bitmap", required_argument, NULL, 'B' },
516 { "connect", required_argument, NULL, 'c' },
517 { "disconnect", no_argument, NULL, 'd' },
518 { "list", no_argument, NULL, 'L' },
519 { "snapshot", no_argument, NULL, 's' },
520 { "load-snapshot", required_argument, NULL, 'l' },
521 { "nocache", no_argument, NULL, 'n' },
522 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
523 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
524 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
525 { "detect-zeroes", required_argument, NULL,
526 QEMU_NBD_OPT_DETECT_ZEROES },
527 { "shared", required_argument, NULL, 'e' },
528 { "format", required_argument, NULL, 'f' },
529 { "persistent", no_argument, NULL, 't' },
530 { "verbose", no_argument, NULL, 'v' },
531 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
532 { "export-name", required_argument, NULL, 'x' },
533 { "description", required_argument, NULL, 'D' },
534 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
535 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
536 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
537 { "trace", required_argument, NULL, 'T' },
538 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
539 { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE },
540 { NULL, 0, NULL, 0 }
541 };
542 int ch;
543 int opt_ind = 0;
544 int flags = BDRV_O_RDWR;
545 int ret = 0;
546 bool seen_cache = false;
547 bool seen_discard = false;
548 bool seen_aio = false;
549 pthread_t client_thread;
550 const char *fmt = NULL;
551 Error *local_err = NULL;
552 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
553 QDict *options = NULL;
554 const char *export_name = NULL;
555 const char *export_description = NULL;
556 strList *bitmaps = NULL;
557 bool alloc_depth = false;
558 const char *tlscredsid = NULL;
559 bool imageOpts = false;
560 bool writethrough = true;
561 bool fork_process = false;
562 bool list = false;
563 int old_stderr = -1;
564 unsigned socket_activation;
565 const char *pid_file_name = NULL;
566 BlockExportOptions *export_opts;
567
568#ifdef CONFIG_POSIX
569 os_setup_early_signal_handling();
570 os_setup_signal_handling();
571#endif
572
573 socket_init();
574 error_init(argv[0]);
575 module_call_init(MODULE_INIT_TRACE);
576 qcrypto_init(&error_fatal);
577
578 module_call_init(MODULE_INIT_QOM);
579 qemu_add_opts(&qemu_trace_opts);
580 qemu_init_exec_dir(argv[0]);
581
582 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
583 switch (ch) {
584 case 's':
585 flags |= BDRV_O_SNAPSHOT;
586 break;
587 case 'n':
588 optarg = (char *) "none";
589
590 case QEMU_NBD_OPT_CACHE:
591 if (seen_cache) {
592 error_report("-n and --cache can only be specified once");
593 exit(EXIT_FAILURE);
594 }
595 seen_cache = true;
596 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
597 error_report("Invalid cache mode `%s'", optarg);
598 exit(EXIT_FAILURE);
599 }
600 break;
601 case QEMU_NBD_OPT_AIO:
602 if (seen_aio) {
603 error_report("--aio can only be specified once");
604 exit(EXIT_FAILURE);
605 }
606 seen_aio = true;
607 if (bdrv_parse_aio(optarg, &flags) < 0) {
608 error_report("Invalid aio mode '%s'", optarg);
609 exit(EXIT_FAILURE);
610 }
611 break;
612 case QEMU_NBD_OPT_DISCARD:
613 if (seen_discard) {
614 error_report("--discard can only be specified once");
615 exit(EXIT_FAILURE);
616 }
617 seen_discard = true;
618 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
619 error_report("Invalid discard mode `%s'", optarg);
620 exit(EXIT_FAILURE);
621 }
622 break;
623 case QEMU_NBD_OPT_DETECT_ZEROES:
624 detect_zeroes =
625 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
626 optarg,
627 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
628 &local_err);
629 if (local_err) {
630 error_reportf_err(local_err,
631 "Failed to parse detect_zeroes mode: ");
632 exit(EXIT_FAILURE);
633 }
634 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
635 !(flags & BDRV_O_UNMAP)) {
636 error_report("setting detect-zeroes to unmap is not allowed "
637 "without setting discard operation to unmap");
638 exit(EXIT_FAILURE);
639 }
640 break;
641 case 'b':
642 bindto = optarg;
643 break;
644 case 'p':
645 port = optarg;
646 break;
647 case 'o':
648 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
649 error_report("Invalid offset '%s'", optarg);
650 exit(EXIT_FAILURE);
651 }
652 break;
653 case 'l':
654 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
655 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
656 optarg, false);
657 if (!sn_opts) {
658 error_report("Failed in parsing snapshot param `%s'",
659 optarg);
660 exit(EXIT_FAILURE);
661 }
662 } else {
663 sn_id_or_name = optarg;
664 }
665
666 case 'r':
667 readonly = true;
668 flags &= ~BDRV_O_RDWR;
669 break;
670 case 'A':
671 alloc_depth = true;
672 break;
673 case 'B':
674 QAPI_LIST_PREPEND(bitmaps, g_strdup(optarg));
675 break;
676 case 'k':
677 sockpath = optarg;
678 if (sockpath[0] != '/') {
679 error_report("socket path must be absolute");
680 exit(EXIT_FAILURE);
681 }
682 break;
683 case 'd':
684 disconnect = true;
685 break;
686 case 'c':
687 device = optarg;
688 break;
689 case 'e':
690 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
691 shared < 0) {
692 error_report("Invalid shared device number '%s'", optarg);
693 exit(EXIT_FAILURE);
694 }
695 break;
696 case 'f':
697 fmt = optarg;
698 break;
699 case 't':
700 persistent = 1;
701 break;
702 case 'x':
703 export_name = optarg;
704 if (strlen(export_name) > NBD_MAX_STRING_SIZE) {
705 error_report("export name '%s' too long", export_name);
706 exit(EXIT_FAILURE);
707 }
708 break;
709 case 'D':
710 export_description = optarg;
711 if (strlen(export_description) > NBD_MAX_STRING_SIZE) {
712 error_report("export description '%s' too long",
713 export_description);
714 exit(EXIT_FAILURE);
715 }
716 break;
717 case 'v':
718 verbose = 1;
719 break;
720 case 'V':
721 version(argv[0]);
722 exit(0);
723 break;
724 case 'h':
725 usage(argv[0]);
726 exit(0);
727 break;
728 case '?':
729 error_report("Try `%s --help' for more information.", argv[0]);
730 exit(EXIT_FAILURE);
731 case QEMU_NBD_OPT_OBJECT:
732 user_creatable_process_cmdline(optarg);
733 break;
734 case QEMU_NBD_OPT_TLSCREDS:
735 tlscredsid = optarg;
736 break;
737 case QEMU_NBD_OPT_IMAGE_OPTS:
738 imageOpts = true;
739 break;
740 case 'T':
741 trace_opt_parse(optarg);
742 break;
743 case QEMU_NBD_OPT_TLSAUTHZ:
744 tlsauthz = optarg;
745 break;
746 case QEMU_NBD_OPT_FORK:
747 fork_process = true;
748 break;
749 case 'L':
750 list = true;
751 break;
752 case QEMU_NBD_OPT_PID_FILE:
753 pid_file_name = optarg;
754 break;
755 }
756 }
757
758 if (list) {
759 if (argc != optind) {
760 error_report("List mode is incompatible with a file name");
761 exit(EXIT_FAILURE);
762 }
763 if (export_name || export_description || dev_offset ||
764 device || disconnect || fmt || sn_id_or_name || bitmaps ||
765 alloc_depth || seen_aio || seen_discard || seen_cache) {
766 error_report("List mode is incompatible with per-device settings");
767 exit(EXIT_FAILURE);
768 }
769 if (fork_process) {
770 error_report("List mode is incompatible with forking");
771 exit(EXIT_FAILURE);
772 }
773 } else if ((argc - optind) != 1) {
774 error_report("Invalid number of arguments");
775 error_printf("Try `%s --help' for more information.\n", argv[0]);
776 exit(EXIT_FAILURE);
777 } else if (!export_name) {
778 export_name = "";
779 }
780
781 if (!trace_init_backends()) {
782 exit(1);
783 }
784 trace_init_file();
785 qemu_set_log(LOG_TRACE);
786
787 socket_activation = check_socket_activation();
788 if (socket_activation == 0) {
789 setup_address_and_port(&bindto, &port);
790 } else {
791
792 const char *err_msg = socket_activation_validate_opts(device, sockpath,
793 bindto, port,
794 list);
795 if (err_msg != NULL) {
796 error_report("%s", err_msg);
797 exit(EXIT_FAILURE);
798 }
799
800
801 if (socket_activation > 1) {
802 error_report("qemu-nbd does not support socket activation with %s > 1",
803 "LISTEN_FDS");
804 exit(EXIT_FAILURE);
805 }
806 }
807
808 if (tlscredsid) {
809 if (sockpath) {
810 error_report("TLS is only supported with IPv4/IPv6");
811 exit(EXIT_FAILURE);
812 }
813 if (device) {
814 error_report("TLS is not supported with a host device");
815 exit(EXIT_FAILURE);
816 }
817 if (tlsauthz && list) {
818 error_report("TLS authorization is incompatible with export list");
819 exit(EXIT_FAILURE);
820 }
821 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
822 if (local_err) {
823 error_reportf_err(local_err, "Failed to get TLS creds: ");
824 exit(EXIT_FAILURE);
825 }
826 } else {
827 if (tlsauthz) {
828 error_report("--tls-authz is not permitted without --tls-creds");
829 exit(EXIT_FAILURE);
830 }
831 }
832
833 if (list) {
834 saddr = nbd_build_socket_address(sockpath, bindto, port);
835 return qemu_nbd_client_list(saddr, tlscreds, bindto);
836 }
837
838#if !HAVE_NBD_DEVICE
839 if (disconnect || device) {
840 error_report("Kernel /dev/nbdN support not available");
841 exit(EXIT_FAILURE);
842 }
843#else
844 if (disconnect) {
845 int nbdfd = open(argv[optind], O_RDWR);
846 if (nbdfd < 0) {
847 error_report("Cannot open %s: %s", argv[optind],
848 strerror(errno));
849 exit(EXIT_FAILURE);
850 }
851 nbd_disconnect(nbdfd);
852
853 close(nbdfd);
854
855 printf("%s disconnected\n", argv[optind]);
856
857 return 0;
858 }
859#endif
860
861 if ((device && !verbose) || fork_process) {
862#ifndef WIN32
863 int stderr_fd[2];
864 pid_t pid;
865 int ret;
866
867 if (qemu_pipe(stderr_fd) < 0) {
868 error_report("Error setting up communication pipe: %s",
869 strerror(errno));
870 exit(EXIT_FAILURE);
871 }
872
873
874
875
876 pid = fork();
877 if (pid < 0) {
878 error_report("Failed to fork: %s", strerror(errno));
879 exit(EXIT_FAILURE);
880 } else if (pid == 0) {
881 close(stderr_fd[0]);
882
883
884 if (fork_process) {
885 old_stderr = dup(STDERR_FILENO);
886 }
887
888 ret = qemu_daemon(1, 0);
889
890
891 dup2(stderr_fd[1], STDERR_FILENO);
892 if (ret < 0) {
893 error_report("Failed to daemonize: %s", strerror(errno));
894 exit(EXIT_FAILURE);
895 }
896
897
898 close(stderr_fd[1]);
899 } else {
900 bool errors = false;
901 char *buf;
902
903
904
905
906 close(stderr_fd[1]);
907 buf = g_malloc(1024);
908 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
909 errors = true;
910 ret = qemu_write_full(STDERR_FILENO, buf, ret);
911 if (ret < 0) {
912 exit(EXIT_FAILURE);
913 }
914 }
915 if (ret < 0) {
916 error_report("Cannot read from daemon: %s",
917 strerror(errno));
918 exit(EXIT_FAILURE);
919 }
920
921
922
923
924 exit(errors);
925 }
926#else
927 error_report("Unable to fork into background on Windows hosts");
928 exit(EXIT_FAILURE);
929#endif
930 }
931
932 if (device != NULL && sockpath == NULL) {
933 sockpath = g_malloc(128);
934 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
935 }
936
937 server = qio_net_listener_new();
938 if (socket_activation == 0) {
939 int backlog;
940
941 if (persistent || shared == 0) {
942 backlog = SOMAXCONN;
943 } else {
944 backlog = MIN(shared, SOMAXCONN);
945 }
946 saddr = nbd_build_socket_address(sockpath, bindto, port);
947 if (qio_net_listener_open_sync(server, saddr, backlog,
948 &local_err) < 0) {
949 object_unref(OBJECT(server));
950 error_report_err(local_err);
951 exit(EXIT_FAILURE);
952 }
953 } else {
954 size_t i;
955
956 for (i = 0; i < socket_activation; i++) {
957 QIOChannelSocket *sioc;
958 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
959 &local_err);
960 if (sioc == NULL) {
961 object_unref(OBJECT(server));
962 error_reportf_err(local_err,
963 "Failed to use socket activation: ");
964 exit(EXIT_FAILURE);
965 }
966 qio_net_listener_add(server, sioc);
967 object_unref(OBJECT(sioc));
968 }
969 }
970
971 if (qemu_init_main_loop(&local_err)) {
972 error_report_err(local_err);
973 exit(EXIT_FAILURE);
974 }
975 bdrv_init();
976 atexit(qemu_nbd_shutdown);
977
978 srcpath = argv[optind];
979 if (imageOpts) {
980 QemuOpts *opts;
981 if (fmt) {
982 error_report("--image-opts and -f are mutually exclusive");
983 exit(EXIT_FAILURE);
984 }
985 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
986 if (!opts) {
987 qemu_opts_reset(&file_opts);
988 exit(EXIT_FAILURE);
989 }
990 options = qemu_opts_to_qdict(opts, NULL);
991 qemu_opts_reset(&file_opts);
992 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
993 } else {
994 if (fmt) {
995 options = qdict_new();
996 qdict_put_str(options, "driver", fmt);
997 }
998 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
999 }
1000
1001 if (!blk) {
1002 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1003 argv[optind]);
1004 exit(EXIT_FAILURE);
1005 }
1006 bs = blk_bs(blk);
1007
1008 if (dev_offset) {
1009 QDict *raw_opts = qdict_new();
1010 qdict_put_str(raw_opts, "driver", "raw");
1011 qdict_put_str(raw_opts, "file", bs->node_name);
1012 qdict_put_int(raw_opts, "offset", dev_offset);
1013 bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal);
1014 blk_remove_bs(blk);
1015 blk_insert_bs(blk, bs, &error_fatal);
1016 bdrv_unref(bs);
1017 }
1018
1019 blk_set_enable_write_cache(blk, !writethrough);
1020
1021 if (sn_opts) {
1022 ret = bdrv_snapshot_load_tmp(bs,
1023 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1024 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1025 &local_err);
1026 } else if (sn_id_or_name) {
1027 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1028 &local_err);
1029 }
1030 if (ret < 0) {
1031 error_reportf_err(local_err, "Failed to load snapshot: ");
1032 exit(EXIT_FAILURE);
1033 }
1034
1035 bs->detect_zeroes = detect_zeroes;
1036
1037 nbd_server_is_qemu_nbd(true);
1038
1039 export_opts = g_new(BlockExportOptions, 1);
1040 *export_opts = (BlockExportOptions) {
1041 .type = BLOCK_EXPORT_TYPE_NBD,
1042 .id = g_strdup("qemu-nbd-export"),
1043 .node_name = g_strdup(bdrv_get_node_name(bs)),
1044 .has_writethrough = true,
1045 .writethrough = writethrough,
1046 .has_writable = true,
1047 .writable = !readonly,
1048 .u.nbd = {
1049 .has_name = true,
1050 .name = g_strdup(export_name),
1051 .has_description = !!export_description,
1052 .description = g_strdup(export_description),
1053 .has_bitmaps = !!bitmaps,
1054 .bitmaps = bitmaps,
1055 .has_allocation_depth = alloc_depth,
1056 .allocation_depth = alloc_depth,
1057 },
1058 };
1059 blk_exp_add(export_opts, &error_fatal);
1060 qapi_free_BlockExportOptions(export_opts);
1061
1062 if (device) {
1063#if HAVE_NBD_DEVICE
1064 int ret;
1065
1066 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1067 if (ret != 0) {
1068 error_report("Failed to create client thread: %s", strerror(ret));
1069 exit(EXIT_FAILURE);
1070 }
1071#endif
1072 } else {
1073
1074 memset(&client_thread, 0, sizeof(client_thread));
1075 }
1076
1077 nbd_update_server_watch();
1078
1079 if (pid_file_name) {
1080 qemu_write_pidfile(pid_file_name, &error_fatal);
1081 }
1082
1083
1084
1085 if (chdir("/") < 0) {
1086 error_report("Could not chdir to root directory: %s",
1087 strerror(errno));
1088 exit(EXIT_FAILURE);
1089 }
1090
1091 if (fork_process) {
1092 dup2(old_stderr, STDERR_FILENO);
1093 close(old_stderr);
1094 }
1095
1096 state = RUNNING;
1097 do {
1098 main_loop_wait(false);
1099 if (state == TERMINATE) {
1100 blk_exp_close_all();
1101 state = TERMINATED;
1102 }
1103 } while (state != TERMINATED);
1104
1105 blk_unref(blk);
1106 if (sockpath) {
1107 unlink(sockpath);
1108 }
1109
1110 qemu_opts_del(sn_opts);
1111
1112 if (device) {
1113 void *ret;
1114 pthread_join(client_thread, &ret);
1115 exit(ret != NULL);
1116 } else {
1117 exit(EXIT_SUCCESS);
1118 }
1119}
1120
