1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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 CONFIG_SELINUX
51#include <selinux/selinux.h>
52#endif
53
54#ifdef __linux__
55#define HAVE_NBD_DEVICE 1
56#else
57#define HAVE_NBD_DEVICE 0
58#endif
59
60#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
61#define QEMU_NBD_OPT_CACHE 256
62#define QEMU_NBD_OPT_AIO 257
63#define QEMU_NBD_OPT_DISCARD 258
64#define QEMU_NBD_OPT_DETECT_ZEROES 259
65#define QEMU_NBD_OPT_OBJECT 260
66#define QEMU_NBD_OPT_TLSCREDS 261
67#define QEMU_NBD_OPT_IMAGE_OPTS 262
68#define QEMU_NBD_OPT_FORK 263
69#define QEMU_NBD_OPT_TLSAUTHZ 264
70#define QEMU_NBD_OPT_PID_FILE 265
71#define QEMU_NBD_OPT_SELINUX_LABEL 266
72#define QEMU_NBD_OPT_TLSHOSTNAME 267
73
74#define MBR_SIZE 512
75
76static int verbose;
77static char *srcpath;
78static SocketAddress *saddr;
79static int persistent = 0;
80static enum { RUNNING, TERMINATE, TERMINATED } state;
81static int shared = 1;
82static int nb_fds;
83static QIONetListener *server;
84static QCryptoTLSCreds *tlscreds;
85static const char *tlsauthz;
86
87static void usage(const char *name)
88{
89 (printf) (
90"Usage: %s [OPTIONS] FILE\n"
91" or: %s -L [OPTIONS]\n"
92"QEMU Disk Network Block Device Utility\n"
93"\n"
94" -h, --help display this help and exit\n"
95" -V, --version output version information and exit\n"
96"\n"
97"Connection properties:\n"
98" -p, --port=PORT port to listen on (default `%d')\n"
99" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
100" -k, --socket=PATH path to the unix socket\n"
101" (default '"SOCKET_PATH"')\n"
102" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
103" -t, --persistent don't exit on the last connection\n"
104" -v, --verbose display extra debugging information\n"
105" -x, --export-name=NAME expose export by name (default is empty string)\n"
106" -D, --description=TEXT export a human-readable description\n"
107"\n"
108"Exposing part of the image:\n"
109" -o, --offset=OFFSET offset into the image\n"
110" -A, --allocation-depth expose the allocation depth\n"
111" -B, --bitmap=NAME expose a persistent dirty bitmap\n"
112"\n"
113"General purpose options:\n"
114" -L, --list list exports available from another NBD server\n"
115" --object type,id=ID,... define an object such as 'secret' for providing\n"
116" passwords and/or encryption keys\n"
117" --tls-creds=ID use id of an earlier --object to provide TLS\n"
118" --tls-authz=ID use id of an earlier --object to provide\n"
119" authorization\n"
120" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
121" specify tracing options\n"
122" --fork fork off the server process and exit the parent\n"
123" once the server is running\n"
124" --pid-file=PATH store the server's process ID in the given file\n"
125#ifdef CONFIG_SELINUX
126" --selinux-label=LABEL set SELinux process label on listening socket\n"
127#endif
128#if HAVE_NBD_DEVICE
129"\n"
130"Kernel NBD client support:\n"
131" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
132" -d, --disconnect disconnect the specified device\n"
133#endif
134"\n"
135"Block device options:\n"
136" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
137" -r, --read-only export read-only\n"
138" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
139" file with backing_file=FILE, redirect the write to\n"
140" the temporary one\n"
141" -l, --load-snapshot=SNAPSHOT_PARAM\n"
142" load an internal snapshot inside FILE and export it\n"
143" as an read-only device, SNAPSHOT_PARAM format is\n"
144" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
145" '[ID_OR_NAME]'\n"
146" -n, --nocache disable host cache\n"
147" --cache=MODE set cache mode used to access the disk image, the\n"
148" valid options are: 'none', 'writeback' (default),\n"
149" 'writethrough', 'directsync' and 'unsafe'\n"
150" --aio=MODE set AIO mode (native, io_uring or threads)\n"
151" --discard=MODE set discard mode (ignore, unmap)\n"
152" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
153" --image-opts treat FILE as a full set of image options\n"
154"\n"
155QEMU_HELP_BOTTOM "\n"
156 , name, name, NBD_DEFAULT_PORT, "DEVICE");
157}
158
159static void version(const char *name)
160{
161 printf(
162"%s " QEMU_FULL_VERSION "\n"
163"Written by Anthony Liguori.\n"
164"\n"
165QEMU_COPYRIGHT "\n"
166"This is free software; see the source for copying conditions. There is NO\n"
167"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
168 , name);
169}
170
171#ifdef CONFIG_POSIX
172
173
174
175
176void qemu_system_killed(int signum, pid_t pid)
177{
178 qatomic_cmpxchg(&state, RUNNING, TERMINATE);
179 qemu_notify_event();
180}
181#endif
182
183static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
184 const char *hostname)
185{
186 int ret = EXIT_FAILURE;
187 int rc;
188 Error *err = NULL;
189 QIOChannelSocket *sioc;
190 NBDExportInfo *list;
191 int i, j;
192
193 sioc = qio_channel_socket_new();
194 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
195 error_report_err(err);
196 goto out;
197 }
198 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
199 &err);
200 if (rc < 0) {
201 if (err) {
202 error_report_err(err);
203 }
204 goto out;
205 }
206 printf("exports available: %d\n", rc);
207 for (i = 0; i < rc; i++) {
208 printf(" export: '%s'\n", list[i].name);
209 if (list[i].description && *list[i].description) {
210 printf(" description: %s\n", list[i].description);
211 }
212 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
213 static const char *const flag_names[] = {
214 [NBD_FLAG_READ_ONLY_BIT] = "readonly",
215 [NBD_FLAG_SEND_FLUSH_BIT] = "flush",
216 [NBD_FLAG_SEND_FUA_BIT] = "fua",
217 [NBD_FLAG_ROTATIONAL_BIT] = "rotational",
218 [NBD_FLAG_SEND_TRIM_BIT] = "trim",
219 [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
220 [NBD_FLAG_SEND_DF_BIT] = "df",
221 [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
222 [NBD_FLAG_SEND_RESIZE_BIT] = "resize",
223 [NBD_FLAG_SEND_CACHE_BIT] = "cache",
224 [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero",
225 };
226
227 printf(" size: %" PRIu64 "\n", list[i].size);
228 printf(" flags: 0x%x (", list[i].flags);
229 for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
230 if (flag_names[bit] && (list[i].flags & (1 << bit))) {
231 printf(" %s", flag_names[bit]);
232 }
233 }
234 printf(" )\n");
235 }
236 if (list[i].min_block) {
237 printf(" min block: %u\n", list[i].min_block);
238 printf(" opt block: %u\n", list[i].opt_block);
239 printf(" max block: %u\n", list[i].max_block);
240 }
241 if (list[i].n_contexts) {
242 printf(" available meta contexts: %d\n", list[i].n_contexts);
243 for (j = 0; j < list[i].n_contexts; j++) {
244 printf(" %s\n", list[i].contexts[j]);
245 }
246 }
247 }
248 nbd_free_export_list(list, rc);
249
250 ret = EXIT_SUCCESS;
251 out:
252 object_unref(OBJECT(sioc));
253 return ret;
254}
255
256
257#if HAVE_NBD_DEVICE
258static void *show_parts(void *arg)
259{
260 char *device = arg;
261 int nbd;
262
263
264
265
266
267
268 nbd = open(device, O_RDWR);
269 if (nbd >= 0) {
270 close(nbd);
271 }
272 return NULL;
273}
274
275static void *nbd_client_thread(void *arg)
276{
277 char *device = arg;
278 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
279 QIOChannelSocket *sioc;
280 int fd = -1;
281 int ret = EXIT_FAILURE;
282 pthread_t show_parts_thread;
283 Error *local_error = NULL;
284
285 sioc = qio_channel_socket_new();
286 if (qio_channel_socket_connect_sync(sioc,
287 saddr,
288 &local_error) < 0) {
289 error_report_err(local_error);
290 goto out;
291 }
292
293 if (nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
294 NULL, NULL, NULL, &info, &local_error) < 0) {
295 if (local_error) {
296 error_report_err(local_error);
297 }
298 goto out;
299 }
300
301 fd = open(device, O_RDWR);
302 if (fd < 0) {
303
304 error_report("Failed to open %s: %m", device);
305 goto out;
306 }
307
308 if (nbd_init(fd, sioc, &info, &local_error) < 0) {
309 error_report_err(local_error);
310 goto out;
311 }
312
313
314 pthread_create(&show_parts_thread, NULL, show_parts, device);
315
316 if (verbose) {
317 fprintf(stderr, "NBD device %s is now connected to %s\n",
318 device, srcpath);
319 } else {
320
321 dup2(STDOUT_FILENO, STDERR_FILENO);
322 }
323
324 if (nbd_client(fd) < 0) {
325 goto out;
326 }
327
328 ret = EXIT_SUCCESS;
329
330 out:
331 if (fd >= 0) {
332 close(fd);
333 }
334 object_unref(OBJECT(sioc));
335 g_free(info.name);
336 kill(getpid(), SIGTERM);
337 return (void *) (intptr_t) ret;
338}
339#endif
340
341static int nbd_can_accept(void)
342{
343 return state == RUNNING && (shared == 0 || nb_fds < shared);
344}
345
346static void nbd_update_server_watch(void);
347
348static void nbd_client_closed(NBDClient *client, bool negotiated)
349{
350 nb_fds--;
351 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
352 state = TERMINATE;
353 }
354 nbd_update_server_watch();
355 nbd_client_put(client);
356}
357
358static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
359 gpointer opaque)
360{
361 if (state >= TERMINATE) {
362 return;
363 }
364
365 nb_fds++;
366 nbd_update_server_watch();
367 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
368}
369
370static void nbd_update_server_watch(void)
371{
372 if (nbd_can_accept()) {
373 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
374 } else {
375 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
376 }
377}
378
379
380static SocketAddress *nbd_build_socket_address(const char *sockpath,
381 const char *bindto,
382 const char *port)
383{
384 SocketAddress *saddr;
385
386 saddr = g_new0(SocketAddress, 1);
387 if (sockpath) {
388 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
389 saddr->u.q_unix.path = g_strdup(sockpath);
390 } else {
391 InetSocketAddress *inet;
392 saddr->type = SOCKET_ADDRESS_TYPE_INET;
393 inet = &saddr->u.inet;
394 inet->host = g_strdup(bindto);
395 if (port) {
396 inet->port = g_strdup(port);
397 } else {
398 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
399 }
400 }
401
402 return saddr;
403}
404
405
406static QemuOptsList file_opts = {
407 .name = "file",
408 .implied_opt_name = "file",
409 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
410 .desc = {
411
412 { }
413 },
414};
415
416static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
417 Error **errp)
418{
419 Object *obj;
420 QCryptoTLSCreds *creds;
421
422 obj = object_resolve_path_component(
423 object_get_objects_root(), id);
424 if (!obj) {
425 error_setg(errp, "No TLS credentials with id '%s'",
426 id);
427 return NULL;
428 }
429 creds = (QCryptoTLSCreds *)
430 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
431 if (!creds) {
432 error_setg(errp, "Object with id '%s' is not TLS credentials",
433 id);
434 return NULL;
435 }
436
437 if (!qcrypto_tls_creds_check_endpoint(creds,
438 list
439 ? QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT
440 : QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
441 errp)) {
442 return NULL;
443 }
444 object_ref(obj);
445 return creds;
446}
447
448static void setup_address_and_port(const char **address, const char **port)
449{
450 if (*address == NULL) {
451 *address = "0.0.0.0";
452 }
453
454 if (*port == NULL) {
455 *port = stringify(NBD_DEFAULT_PORT);
456 }
457}
458
459
460
461
462static const char *socket_activation_validate_opts(const char *device,
463 const char *sockpath,
464 const char *address,
465 const char *port,
466 const char *selinux,
467 bool list)
468{
469 if (device != NULL) {
470 return "NBD device can't be set when using socket activation";
471 }
472
473 if (sockpath != NULL) {
474 return "Unix socket can't be set when using socket activation";
475 }
476
477 if (address != NULL) {
478 return "The interface can't be set when using socket activation";
479 }
480
481 if (port != NULL) {
482 return "TCP port number can't be set when using socket activation";
483 }
484
485 if (selinux != NULL) {
486 return "SELinux label can't be set when using socket activation";
487 }
488
489 if (list) {
490 return "List mode is incompatible with socket activation";
491 }
492
493 return NULL;
494}
495
496static void qemu_nbd_shutdown(void)
497{
498 job_cancel_sync_all();
499 blk_exp_close_all();
500 bdrv_close_all();
501}
502
503int main(int argc, char **argv)
504{
505 BlockBackend *blk;
506 BlockDriverState *bs;
507 uint64_t dev_offset = 0;
508 bool readonly = false;
509 bool disconnect = false;
510 const char *bindto = NULL;
511 const char *port = NULL;
512 char *sockpath = NULL;
513 char *device = NULL;
514 QemuOpts *sn_opts = NULL;
515 const char *sn_id_or_name = NULL;
516 const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:AB:L";
517 struct option lopt[] = {
518 { "help", no_argument, NULL, 'h' },
519 { "version", no_argument, NULL, 'V' },
520 { "bind", required_argument, NULL, 'b' },
521 { "port", required_argument, NULL, 'p' },
522 { "socket", required_argument, NULL, 'k' },
523 { "offset", required_argument, NULL, 'o' },
524 { "read-only", no_argument, NULL, 'r' },
525 { "allocation-depth", no_argument, NULL, 'A' },
526 { "bitmap", required_argument, NULL, 'B' },
527 { "connect", required_argument, NULL, 'c' },
528 { "disconnect", no_argument, NULL, 'd' },
529 { "list", no_argument, NULL, 'L' },
530 { "snapshot", no_argument, NULL, 's' },
531 { "load-snapshot", required_argument, NULL, 'l' },
532 { "nocache", no_argument, NULL, 'n' },
533 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
534 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
535 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
536 { "detect-zeroes", required_argument, NULL,
537 QEMU_NBD_OPT_DETECT_ZEROES },
538 { "shared", required_argument, NULL, 'e' },
539 { "format", required_argument, NULL, 'f' },
540 { "persistent", no_argument, NULL, 't' },
541 { "verbose", no_argument, NULL, 'v' },
542 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
543 { "export-name", required_argument, NULL, 'x' },
544 { "description", required_argument, NULL, 'D' },
545 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
546 { "tls-hostname", required_argument, NULL, QEMU_NBD_OPT_TLSHOSTNAME },
547 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
548 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
549 { "trace", required_argument, NULL, 'T' },
550 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
551 { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE },
552 { "selinux-label", required_argument, NULL,
553 QEMU_NBD_OPT_SELINUX_LABEL },
554 { NULL, 0, NULL, 0 }
555 };
556 int ch;
557 int opt_ind = 0;
558 int flags = BDRV_O_RDWR;
559 int ret = 0;
560 bool seen_cache = false;
561 bool seen_discard = false;
562 bool seen_aio = false;
563 pthread_t client_thread;
564 const char *fmt = NULL;
565 Error *local_err = NULL;
566 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
567 QDict *options = NULL;
568 const char *export_name = NULL;
569 const char *export_description = NULL;
570 strList *bitmaps = NULL;
571 bool alloc_depth = false;
572 const char *tlscredsid = NULL;
573 const char *tlshostname = NULL;
574 bool imageOpts = false;
575 bool writethrough = false;
576 bool fork_process = false;
577 bool list = false;
578 int old_stderr = -1;
579 unsigned socket_activation;
580 const char *pid_file_name = NULL;
581 const char *selinux_label = NULL;
582 BlockExportOptions *export_opts;
583
584#ifdef CONFIG_POSIX
585 os_setup_early_signal_handling();
586 os_setup_signal_handling();
587#endif
588
589 socket_init();
590 error_init(argv[0]);
591 module_call_init(MODULE_INIT_TRACE);
592 qcrypto_init(&error_fatal);
593
594 module_call_init(MODULE_INIT_QOM);
595 qemu_add_opts(&qemu_trace_opts);
596 qemu_init_exec_dir(argv[0]);
597
598 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
599 switch (ch) {
600 case 's':
601 flags |= BDRV_O_SNAPSHOT;
602 break;
603 case 'n':
604 optarg = (char *) "none";
605
606 case QEMU_NBD_OPT_CACHE:
607 if (seen_cache) {
608 error_report("-n and --cache can only be specified once");
609 exit(EXIT_FAILURE);
610 }
611 seen_cache = true;
612 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
613 error_report("Invalid cache mode `%s'", optarg);
614 exit(EXIT_FAILURE);
615 }
616 break;
617 case QEMU_NBD_OPT_AIO:
618 if (seen_aio) {
619 error_report("--aio can only be specified once");
620 exit(EXIT_FAILURE);
621 }
622 seen_aio = true;
623 if (bdrv_parse_aio(optarg, &flags) < 0) {
624 error_report("Invalid aio mode '%s'", optarg);
625 exit(EXIT_FAILURE);
626 }
627 break;
628 case QEMU_NBD_OPT_DISCARD:
629 if (seen_discard) {
630 error_report("--discard can only be specified once");
631 exit(EXIT_FAILURE);
632 }
633 seen_discard = true;
634 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
635 error_report("Invalid discard mode `%s'", optarg);
636 exit(EXIT_FAILURE);
637 }
638 break;
639 case QEMU_NBD_OPT_DETECT_ZEROES:
640 detect_zeroes =
641 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
642 optarg,
643 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
644 &local_err);
645 if (local_err) {
646 error_reportf_err(local_err,
647 "Failed to parse detect_zeroes mode: ");
648 exit(EXIT_FAILURE);
649 }
650 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
651 !(flags & BDRV_O_UNMAP)) {
652 error_report("setting detect-zeroes to unmap is not allowed "
653 "without setting discard operation to unmap");
654 exit(EXIT_FAILURE);
655 }
656 break;
657 case 'b':
658 bindto = optarg;
659 break;
660 case 'p':
661 port = optarg;
662 break;
663 case 'o':
664 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
665 error_report("Invalid offset '%s'", optarg);
666 exit(EXIT_FAILURE);
667 }
668 break;
669 case 'l':
670 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
671 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
672 optarg, false);
673 if (!sn_opts) {
674 error_report("Failed in parsing snapshot param `%s'",
675 optarg);
676 exit(EXIT_FAILURE);
677 }
678 } else {
679 sn_id_or_name = optarg;
680 }
681
682 case 'r':
683 readonly = true;
684 flags &= ~BDRV_O_RDWR;
685 break;
686 case 'A':
687 alloc_depth = true;
688 break;
689 case 'B':
690 QAPI_LIST_PREPEND(bitmaps, g_strdup(optarg));
691 break;
692 case 'k':
693 sockpath = optarg;
694 if (sockpath[0] != '/') {
695 error_report("socket path must be absolute");
696 exit(EXIT_FAILURE);
697 }
698 break;
699 case 'd':
700 disconnect = true;
701 break;
702 case 'c':
703 device = optarg;
704 break;
705 case 'e':
706 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
707 shared < 0) {
708 error_report("Invalid shared device number '%s'", optarg);
709 exit(EXIT_FAILURE);
710 }
711 break;
712 case 'f':
713 fmt = optarg;
714 break;
715 case 't':
716 persistent = 1;
717 break;
718 case 'x':
719 export_name = optarg;
720 if (strlen(export_name) > NBD_MAX_STRING_SIZE) {
721 error_report("export name '%s' too long", export_name);
722 exit(EXIT_FAILURE);
723 }
724 break;
725 case 'D':
726 export_description = optarg;
727 if (strlen(export_description) > NBD_MAX_STRING_SIZE) {
728 error_report("export description '%s' too long",
729 export_description);
730 exit(EXIT_FAILURE);
731 }
732 break;
733 case 'v':
734 verbose = 1;
735 break;
736 case 'V':
737 version(argv[0]);
738 exit(0);
739 break;
740 case 'h':
741 usage(argv[0]);
742 exit(0);
743 break;
744 case '?':
745 error_report("Try `%s --help' for more information.", argv[0]);
746 exit(EXIT_FAILURE);
747 case QEMU_NBD_OPT_OBJECT:
748 user_creatable_process_cmdline(optarg);
749 break;
750 case QEMU_NBD_OPT_TLSCREDS:
751 tlscredsid = optarg;
752 break;
753 case QEMU_NBD_OPT_TLSHOSTNAME:
754 tlshostname = optarg;
755 break;
756 case QEMU_NBD_OPT_IMAGE_OPTS:
757 imageOpts = true;
758 break;
759 case 'T':
760 trace_opt_parse(optarg);
761 break;
762 case QEMU_NBD_OPT_TLSAUTHZ:
763 tlsauthz = optarg;
764 break;
765 case QEMU_NBD_OPT_FORK:
766 fork_process = true;
767 break;
768 case 'L':
769 list = true;
770 break;
771 case QEMU_NBD_OPT_PID_FILE:
772 pid_file_name = optarg;
773 break;
774 case QEMU_NBD_OPT_SELINUX_LABEL:
775 selinux_label = optarg;
776 break;
777 }
778 }
779
780 if (list) {
781 if (argc != optind) {
782 error_report("List mode is incompatible with a file name");
783 exit(EXIT_FAILURE);
784 }
785 if (export_name || export_description || dev_offset ||
786 device || disconnect || fmt || sn_id_or_name || bitmaps ||
787 alloc_depth || seen_aio || seen_discard || seen_cache) {
788 error_report("List mode is incompatible with per-device settings");
789 exit(EXIT_FAILURE);
790 }
791 if (fork_process) {
792 error_report("List mode is incompatible with forking");
793 exit(EXIT_FAILURE);
794 }
795 } else if ((argc - optind) != 1) {
796 error_report("Invalid number of arguments");
797 error_printf("Try `%s --help' for more information.\n", argv[0]);
798 exit(EXIT_FAILURE);
799 } else if (!export_name) {
800 export_name = "";
801 }
802
803 if (!trace_init_backends()) {
804 exit(1);
805 }
806 trace_init_file();
807 qemu_set_log(LOG_TRACE);
808
809 socket_activation = check_socket_activation();
810 if (socket_activation == 0) {
811 if (!sockpath) {
812 setup_address_and_port(&bindto, &port);
813 }
814 } else {
815
816 const char *err_msg = socket_activation_validate_opts(device, sockpath,
817 bindto, port,
818 selinux_label,
819 list);
820 if (err_msg != NULL) {
821 error_report("%s", err_msg);
822 exit(EXIT_FAILURE);
823 }
824
825
826 if (socket_activation > 1) {
827 error_report("qemu-nbd does not support socket activation with %s > 1",
828 "LISTEN_FDS");
829 exit(EXIT_FAILURE);
830 }
831 }
832
833 if (tlscredsid) {
834 if (device) {
835 error_report("TLS is not supported with a host device");
836 exit(EXIT_FAILURE);
837 }
838 if (tlsauthz && list) {
839 error_report("TLS authorization is incompatible with export list");
840 exit(EXIT_FAILURE);
841 }
842 if (tlshostname && !list) {
843 error_report("TLS hostname is only supported with export list");
844 exit(EXIT_FAILURE);
845 }
846 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
847 if (local_err) {
848 error_reportf_err(local_err, "Failed to get TLS creds: ");
849 exit(EXIT_FAILURE);
850 }
851 } else {
852 if (tlsauthz) {
853 error_report("--tls-authz is not permitted without --tls-creds");
854 exit(EXIT_FAILURE);
855 }
856 if (tlshostname) {
857 error_report("--tls-hostname is not permitted without --tls-creds");
858 exit(EXIT_FAILURE);
859 }
860 }
861
862 if (selinux_label) {
863#ifdef CONFIG_SELINUX
864 if (sockpath == NULL && device == NULL) {
865 error_report("--selinux-label is not permitted without --socket");
866 exit(EXIT_FAILURE);
867 }
868#else
869 error_report("SELinux support not enabled in this binary");
870 exit(EXIT_FAILURE);
871#endif
872 }
873
874 if (list) {
875 saddr = nbd_build_socket_address(sockpath, bindto, port);
876 return qemu_nbd_client_list(saddr, tlscreds,
877 tlshostname ? tlshostname : bindto);
878 }
879
880#if !HAVE_NBD_DEVICE
881 if (disconnect || device) {
882 error_report("Kernel /dev/nbdN support not available");
883 exit(EXIT_FAILURE);
884 }
885#else
886 if (disconnect) {
887 int nbdfd = open(argv[optind], O_RDWR);
888 if (nbdfd < 0) {
889 error_report("Cannot open %s: %s", argv[optind],
890 strerror(errno));
891 exit(EXIT_FAILURE);
892 }
893 nbd_disconnect(nbdfd);
894
895 close(nbdfd);
896
897 printf("%s disconnected\n", argv[optind]);
898
899 return 0;
900 }
901#endif
902
903 if ((device && !verbose) || fork_process) {
904#ifndef WIN32
905 int stderr_fd[2];
906 pid_t pid;
907 int ret;
908
909 if (qemu_pipe(stderr_fd) < 0) {
910 error_report("Error setting up communication pipe: %s",
911 strerror(errno));
912 exit(EXIT_FAILURE);
913 }
914
915
916
917
918 pid = fork();
919 if (pid < 0) {
920 error_report("Failed to fork: %s", strerror(errno));
921 exit(EXIT_FAILURE);
922 } else if (pid == 0) {
923 close(stderr_fd[0]);
924
925
926 if (fork_process) {
927 old_stderr = dup(STDERR_FILENO);
928 }
929
930 ret = qemu_daemon(1, 0);
931
932
933 dup2(stderr_fd[1], STDERR_FILENO);
934 if (ret < 0) {
935 error_report("Failed to daemonize: %s", strerror(errno));
936 exit(EXIT_FAILURE);
937 }
938
939
940 close(stderr_fd[1]);
941 } else {
942 bool errors = false;
943 char *buf;
944
945
946
947
948 close(stderr_fd[1]);
949 buf = g_malloc(1024);
950 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
951 errors = true;
952 ret = qemu_write_full(STDERR_FILENO, buf, ret);
953 if (ret < 0) {
954 exit(EXIT_FAILURE);
955 }
956 }
957 if (ret < 0) {
958 error_report("Cannot read from daemon: %s",
959 strerror(errno));
960 exit(EXIT_FAILURE);
961 }
962
963
964
965
966 exit(errors);
967 }
968#else
969 error_report("Unable to fork into background on Windows hosts");
970 exit(EXIT_FAILURE);
971#endif
972 }
973
974 if (device != NULL && sockpath == NULL) {
975 sockpath = g_malloc(128);
976 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
977 }
978
979 server = qio_net_listener_new();
980 if (socket_activation == 0) {
981 int backlog;
982
983 if (persistent || shared == 0) {
984 backlog = SOMAXCONN;
985 } else {
986 backlog = MIN(shared, SOMAXCONN);
987 }
988#ifdef CONFIG_SELINUX
989 if (selinux_label && setsockcreatecon_raw(selinux_label) == -1) {
990 error_report("Cannot set SELinux socket create context to %s: %s",
991 selinux_label, strerror(errno));
992 exit(EXIT_FAILURE);
993 }
994#endif
995 saddr = nbd_build_socket_address(sockpath, bindto, port);
996 if (qio_net_listener_open_sync(server, saddr, backlog,
997 &local_err) < 0) {
998 object_unref(OBJECT(server));
999 error_report_err(local_err);
1000 exit(EXIT_FAILURE);
1001 }
1002#ifdef CONFIG_SELINUX
1003 if (selinux_label && setsockcreatecon_raw(NULL) == -1) {
1004 error_report("Cannot clear SELinux socket create context: %s",
1005 strerror(errno));
1006 exit(EXIT_FAILURE);
1007 }
1008#endif
1009 } else {
1010 size_t i;
1011
1012 for (i = 0; i < socket_activation; i++) {
1013 QIOChannelSocket *sioc;
1014 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
1015 &local_err);
1016 if (sioc == NULL) {
1017 object_unref(OBJECT(server));
1018 error_reportf_err(local_err,
1019 "Failed to use socket activation: ");
1020 exit(EXIT_FAILURE);
1021 }
1022 qio_net_listener_add(server, sioc);
1023 object_unref(OBJECT(sioc));
1024 }
1025 }
1026
1027 qemu_init_main_loop(&error_fatal);
1028 bdrv_init();
1029 atexit(qemu_nbd_shutdown);
1030
1031 srcpath = argv[optind];
1032 if (imageOpts) {
1033 QemuOpts *opts;
1034 if (fmt) {
1035 error_report("--image-opts and -f are mutually exclusive");
1036 exit(EXIT_FAILURE);
1037 }
1038 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
1039 if (!opts) {
1040 qemu_opts_reset(&file_opts);
1041 exit(EXIT_FAILURE);
1042 }
1043 options = qemu_opts_to_qdict(opts, NULL);
1044 qemu_opts_reset(&file_opts);
1045 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
1046 } else {
1047 if (fmt) {
1048 options = qdict_new();
1049 qdict_put_str(options, "driver", fmt);
1050 }
1051 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
1052 }
1053
1054 if (!blk) {
1055 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1056 argv[optind]);
1057 exit(EXIT_FAILURE);
1058 }
1059 bs = blk_bs(blk);
1060
1061 if (dev_offset) {
1062 QDict *raw_opts = qdict_new();
1063 qdict_put_str(raw_opts, "driver", "raw");
1064 qdict_put_str(raw_opts, "file", bs->node_name);
1065 qdict_put_int(raw_opts, "offset", dev_offset);
1066 bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal);
1067 blk_remove_bs(blk);
1068 blk_insert_bs(blk, bs, &error_fatal);
1069 bdrv_unref(bs);
1070 }
1071
1072 blk_set_enable_write_cache(blk, !writethrough);
1073
1074 if (sn_opts) {
1075 ret = bdrv_snapshot_load_tmp(bs,
1076 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1077 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1078 &local_err);
1079 } else if (sn_id_or_name) {
1080 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1081 &local_err);
1082 }
1083 if (ret < 0) {
1084 error_reportf_err(local_err, "Failed to load snapshot: ");
1085 exit(EXIT_FAILURE);
1086 }
1087
1088 bs->detect_zeroes = detect_zeroes;
1089
1090 nbd_server_is_qemu_nbd(true);
1091
1092 export_opts = g_new(BlockExportOptions, 1);
1093 *export_opts = (BlockExportOptions) {
1094 .type = BLOCK_EXPORT_TYPE_NBD,
1095 .id = g_strdup("qemu-nbd-export"),
1096 .node_name = g_strdup(bdrv_get_node_name(bs)),
1097 .has_writethrough = true,
1098 .writethrough = writethrough,
1099 .has_writable = true,
1100 .writable = !readonly,
1101 .u.nbd = {
1102 .has_name = true,
1103 .name = g_strdup(export_name),
1104 .has_description = !!export_description,
1105 .description = g_strdup(export_description),
1106 .has_bitmaps = !!bitmaps,
1107 .bitmaps = bitmaps,
1108 .has_allocation_depth = alloc_depth,
1109 .allocation_depth = alloc_depth,
1110 },
1111 };
1112 blk_exp_add(export_opts, &error_fatal);
1113 qapi_free_BlockExportOptions(export_opts);
1114
1115 if (device) {
1116#if HAVE_NBD_DEVICE
1117 int ret;
1118
1119 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1120 if (ret != 0) {
1121 error_report("Failed to create client thread: %s", strerror(ret));
1122 exit(EXIT_FAILURE);
1123 }
1124#endif
1125 } else {
1126
1127 memset(&client_thread, 0, sizeof(client_thread));
1128 }
1129
1130 nbd_update_server_watch();
1131
1132 if (pid_file_name) {
1133 qemu_write_pidfile(pid_file_name, &error_fatal);
1134 }
1135
1136
1137
1138 if (chdir("/") < 0) {
1139 error_report("Could not chdir to root directory: %s",
1140 strerror(errno));
1141 exit(EXIT_FAILURE);
1142 }
1143
1144 if (fork_process) {
1145 dup2(old_stderr, STDERR_FILENO);
1146 close(old_stderr);
1147 }
1148
1149 state = RUNNING;
1150 do {
1151 main_loop_wait(false);
1152 if (state == TERMINATE) {
1153 blk_exp_close_all();
1154 state = TERMINATED;
1155 }
1156 } while (state != TERMINATED);
1157
1158 blk_unref(blk);
1159 if (sockpath) {
1160 unlink(sockpath);
1161 }
1162
1163 qemu_opts_del(sn_opts);
1164
1165 if (device) {
1166 void *ret;
1167 pthread_join(client_thread, &ret);
1168 exit(ret != NULL);
1169 } else {
1170 exit(EXIT_SUCCESS);
1171 }
1172}
1173
