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