nbd: Remove NBDExport.close callback
[qemu.git] / qemu-nbd.c
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
3 *
4 * Network Block Device
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; under version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
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 "block/block_int.h"
29 #include "block/nbd.h"
30 #include "qemu/main-loop.h"
31 #include "qemu/module.h"
32 #include "qemu/option.h"
33 #include "qemu/error-report.h"
34 #include "qemu/config-file.h"
35 #include "qemu/bswap.h"
36 #include "qemu/log.h"
37 #include "qemu/systemd.h"
38 #include "block/snapshot.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qmp/qstring.h"
41 #include "qom/object_interfaces.h"
42 #include "io/channel-socket.h"
43 #include "io/net-listener.h"
44 #include "crypto/init.h"
45 #include "trace/control.h"
46 #include "qemu-version.h"
47
48 #ifdef __linux__
49 #define HAVE_NBD_DEVICE 1
50 #else
51 #define HAVE_NBD_DEVICE 0
52 #endif
53
54 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
55 #define QEMU_NBD_OPT_CACHE 256
56 #define QEMU_NBD_OPT_AIO 257
57 #define QEMU_NBD_OPT_DISCARD 258
58 #define QEMU_NBD_OPT_DETECT_ZEROES 259
59 #define QEMU_NBD_OPT_OBJECT 260
60 #define QEMU_NBD_OPT_TLSCREDS 261
61 #define QEMU_NBD_OPT_IMAGE_OPTS 262
62 #define QEMU_NBD_OPT_FORK 263
63 #define QEMU_NBD_OPT_TLSAUTHZ 264
64 #define QEMU_NBD_OPT_PID_FILE 265
65
66 #define MBR_SIZE 512
67
68 static NBDExport *export;
69 static int verbose;
70 static char *srcpath;
71 static SocketAddress *saddr;
72 static int persistent = 0;
73 static enum { RUNNING, TERMINATE, TERMINATED } state;
74 static int shared = 1;
75 static int nb_fds;
76 static QIONetListener *server;
77 static QCryptoTLSCreds *tlscreds;
78 static const char *tlsauthz;
79
80 static 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 " -B, --bitmap=NAME expose a persistent dirty bitmap\n"
104 "\n"
105 "General purpose options:\n"
106 " -L, --list list exports available from another NBD server\n"
107 " --object type,id=ID,... define an object such as 'secret' for providing\n"
108 " passwords and/or encryption keys\n"
109 " --tls-creds=ID use id of an earlier --object to provide TLS\n"
110 " --tls-authz=ID use id of an earlier --object to provide\n"
111 " authorization\n"
112 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
113 " specify tracing options\n"
114 " --fork fork off the server process and exit the parent\n"
115 " once the server is running\n"
116 " --pid-file=PATH store the server's process ID in the given file\n"
117 #if HAVE_NBD_DEVICE
118 "\n"
119 "Kernel NBD client support:\n"
120 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
121 " -d, --disconnect disconnect the specified device\n"
122 #endif
123 "\n"
124 "Block device options:\n"
125 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
126 " -r, --read-only export read-only\n"
127 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
128 " file with backing_file=FILE, redirect the write to\n"
129 " the temporary one\n"
130 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
131 " load an internal snapshot inside FILE and export it\n"
132 " as an read-only device, SNAPSHOT_PARAM format is\n"
133 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
134 " '[ID_OR_NAME]'\n"
135 " -n, --nocache disable host cache\n"
136 " --cache=MODE set cache mode (none, writeback, ...)\n"
137 " --aio=MODE set AIO mode (native, io_uring or threads)\n"
138 " --discard=MODE set discard mode (ignore, unmap)\n"
139 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
140 " --image-opts treat FILE as a full set of image options\n"
141 "\n"
142 QEMU_HELP_BOTTOM "\n"
143 , name, name, NBD_DEFAULT_PORT, "DEVICE");
144 }
145
146 static void version(const char *name)
147 {
148 printf(
149 "%s " QEMU_FULL_VERSION "\n"
150 "Written by Anthony Liguori.\n"
151 "\n"
152 QEMU_COPYRIGHT "\n"
153 "This is free software; see the source for copying conditions. There is NO\n"
154 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
155 , name);
156 }
157
158 #if HAVE_NBD_DEVICE
159 static void termsig_handler(int signum)
160 {
161 qatomic_cmpxchg(&state, RUNNING, TERMINATE);
162 qemu_notify_event();
163 }
164 #endif /* HAVE_NBD_DEVICE */
165
166 static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
167 const char *hostname)
168 {
169 int ret = EXIT_FAILURE;
170 int rc;
171 Error *err = NULL;
172 QIOChannelSocket *sioc;
173 NBDExportInfo *list;
174 int i, j;
175
176 sioc = qio_channel_socket_new();
177 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
178 error_report_err(err);
179 return EXIT_FAILURE;
180 }
181 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
182 &err);
183 if (rc < 0) {
184 if (err) {
185 error_report_err(err);
186 }
187 goto out;
188 }
189 printf("exports available: %d\n", rc);
190 for (i = 0; i < rc; i++) {
191 printf(" export: '%s'\n", list[i].name);
192 if (list[i].description && *list[i].description) {
193 printf(" description: %s\n", list[i].description);
194 }
195 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
196 static const char *const flag_names[] = {
197 [NBD_FLAG_READ_ONLY_BIT] = "readonly",
198 [NBD_FLAG_SEND_FLUSH_BIT] = "flush",
199 [NBD_FLAG_SEND_FUA_BIT] = "fua",
200 [NBD_FLAG_ROTATIONAL_BIT] = "rotational",
201 [NBD_FLAG_SEND_TRIM_BIT] = "trim",
202 [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes",
203 [NBD_FLAG_SEND_DF_BIT] = "df",
204 [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi",
205 [NBD_FLAG_SEND_RESIZE_BIT] = "resize",
206 [NBD_FLAG_SEND_CACHE_BIT] = "cache",
207 [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero",
208 };
209
210 printf(" size: %" PRIu64 "\n", list[i].size);
211 printf(" flags: 0x%x (", list[i].flags);
212 for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
213 if (flag_names[bit] && (list[i].flags & (1 << bit))) {
214 printf(" %s", flag_names[bit]);
215 }
216 }
217 printf(" )\n");
218 }
219 if (list[i].min_block) {
220 printf(" min block: %u\n", list[i].min_block);
221 printf(" opt block: %u\n", list[i].opt_block);
222 printf(" max block: %u\n", list[i].max_block);
223 }
224 if (list[i].n_contexts) {
225 printf(" available meta contexts: %d\n", list[i].n_contexts);
226 for (j = 0; j < list[i].n_contexts; j++) {
227 printf(" %s\n", list[i].contexts[j]);
228 }
229 }
230 }
231 nbd_free_export_list(list, rc);
232
233 ret = EXIT_SUCCESS;
234 out:
235 object_unref(OBJECT(sioc));
236 return ret;
237 }
238
239
240 #if HAVE_NBD_DEVICE
241 static void *show_parts(void *arg)
242 {
243 char *device = arg;
244 int nbd;
245
246 /* linux just needs an open() to trigger
247 * the partition table update
248 * but remember to load the module with max_part != 0 :
249 * modprobe nbd max_part=63
250 */
251 nbd = open(device, O_RDWR);
252 if (nbd >= 0) {
253 close(nbd);
254 }
255 return NULL;
256 }
257
258 static void *nbd_client_thread(void *arg)
259 {
260 char *device = arg;
261 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
262 QIOChannelSocket *sioc;
263 int fd;
264 int ret;
265 pthread_t show_parts_thread;
266 Error *local_error = NULL;
267
268 sioc = qio_channel_socket_new();
269 if (qio_channel_socket_connect_sync(sioc,
270 saddr,
271 &local_error) < 0) {
272 error_report_err(local_error);
273 goto out;
274 }
275
276 ret = nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
277 NULL, NULL, NULL, &info, &local_error);
278 if (ret < 0) {
279 if (local_error) {
280 error_report_err(local_error);
281 }
282 goto out_socket;
283 }
284
285 fd = open(device, O_RDWR);
286 if (fd < 0) {
287 /* Linux-only, we can use %m in printf. */
288 error_report("Failed to open %s: %m", device);
289 goto out_socket;
290 }
291
292 ret = nbd_init(fd, sioc, &info, &local_error);
293 if (ret < 0) {
294 error_report_err(local_error);
295 goto out_fd;
296 }
297
298 /* update partition table */
299 pthread_create(&show_parts_thread, NULL, show_parts, device);
300
301 if (verbose) {
302 fprintf(stderr, "NBD device %s is now connected to %s\n",
303 device, srcpath);
304 } else {
305 /* Close stderr so that the qemu-nbd process exits. */
306 dup2(STDOUT_FILENO, STDERR_FILENO);
307 }
308
309 ret = nbd_client(fd);
310 if (ret) {
311 goto out_fd;
312 }
313 close(fd);
314 object_unref(OBJECT(sioc));
315 g_free(info.name);
316 kill(getpid(), SIGTERM);
317 return (void *) EXIT_SUCCESS;
318
319 out_fd:
320 close(fd);
321 out_socket:
322 object_unref(OBJECT(sioc));
323 out:
324 g_free(info.name);
325 kill(getpid(), SIGTERM);
326 return (void *) EXIT_FAILURE;
327 }
328 #endif /* HAVE_NBD_DEVICE */
329
330 static int nbd_can_accept(void)
331 {
332 return state == RUNNING && nb_fds < shared;
333 }
334
335 static void nbd_update_server_watch(void);
336
337 static void nbd_client_closed(NBDClient *client, bool negotiated)
338 {
339 nb_fds--;
340 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
341 state = TERMINATE;
342 }
343 nbd_update_server_watch();
344 nbd_client_put(client);
345 }
346
347 static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
348 gpointer opaque)
349 {
350 if (state >= TERMINATE) {
351 return;
352 }
353
354 nb_fds++;
355 nbd_update_server_watch();
356 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
357 }
358
359 static void nbd_update_server_watch(void)
360 {
361 if (nbd_can_accept()) {
362 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
363 } else {
364 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
365 }
366 }
367
368
369 static SocketAddress *nbd_build_socket_address(const char *sockpath,
370 const char *bindto,
371 const char *port)
372 {
373 SocketAddress *saddr;
374
375 saddr = g_new0(SocketAddress, 1);
376 if (sockpath) {
377 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
378 saddr->u.q_unix.path = g_strdup(sockpath);
379 } else {
380 InetSocketAddress *inet;
381 saddr->type = SOCKET_ADDRESS_TYPE_INET;
382 inet = &saddr->u.inet;
383 inet->host = g_strdup(bindto);
384 if (port) {
385 inet->port = g_strdup(port);
386 } else {
387 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
388 }
389 }
390
391 return saddr;
392 }
393
394
395 static QemuOptsList file_opts = {
396 .name = "file",
397 .implied_opt_name = "file",
398 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
399 .desc = {
400 /* no elements => accept any params */
401 { /* end of list */ }
402 },
403 };
404
405 static QemuOptsList qemu_object_opts = {
406 .name = "object",
407 .implied_opt_name = "qom-type",
408 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
409 .desc = {
410 { }
411 },
412 };
413
414 static bool qemu_nbd_object_print_help(const char *type, QemuOpts *opts)
415 {
416 if (user_creatable_print_help(type, opts)) {
417 exit(0);
418 }
419 return true;
420 }
421
422
423 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
424 Error **errp)
425 {
426 Object *obj;
427 QCryptoTLSCreds *creds;
428
429 obj = object_resolve_path_component(
430 object_get_objects_root(), id);
431 if (!obj) {
432 error_setg(errp, "No TLS credentials with id '%s'",
433 id);
434 return NULL;
435 }
436 creds = (QCryptoTLSCreds *)
437 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
438 if (!creds) {
439 error_setg(errp, "Object with id '%s' is not TLS credentials",
440 id);
441 return NULL;
442 }
443
444 if (list) {
445 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
446 error_setg(errp,
447 "Expecting TLS credentials with a client endpoint");
448 return NULL;
449 }
450 } else {
451 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
452 error_setg(errp,
453 "Expecting TLS credentials with a server endpoint");
454 return NULL;
455 }
456 }
457 object_ref(obj);
458 return creds;
459 }
460
461 static void setup_address_and_port(const char **address, const char **port)
462 {
463 if (*address == NULL) {
464 *address = "0.0.0.0";
465 }
466
467 if (*port == NULL) {
468 *port = stringify(NBD_DEFAULT_PORT);
469 }
470 }
471
472 /*
473 * Check socket parameters compatibility when socket activation is used.
474 */
475 static const char *socket_activation_validate_opts(const char *device,
476 const char *sockpath,
477 const char *address,
478 const char *port,
479 bool list)
480 {
481 if (device != NULL) {
482 return "NBD device can't be set when using socket activation";
483 }
484
485 if (sockpath != NULL) {
486 return "Unix socket can't be set when using socket activation";
487 }
488
489 if (address != NULL) {
490 return "The interface can't be set when using socket activation";
491 }
492
493 if (port != NULL) {
494 return "TCP port number can't be set when using socket activation";
495 }
496
497 if (list) {
498 return "List mode is incompatible with socket activation";
499 }
500
501 return NULL;
502 }
503
504 static void qemu_nbd_shutdown(void)
505 {
506 job_cancel_sync_all();
507 bdrv_close_all();
508 }
509
510 int main(int argc, char **argv)
511 {
512 BlockBackend *blk;
513 BlockDriverState *bs;
514 uint64_t dev_offset = 0;
515 bool readonly = false;
516 bool disconnect = false;
517 const char *bindto = NULL;
518 const char *port = NULL;
519 char *sockpath = NULL;
520 char *device = NULL;
521 QemuOpts *sn_opts = NULL;
522 const char *sn_id_or_name = NULL;
523 const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:B:L";
524 struct option lopt[] = {
525 { "help", no_argument, NULL, 'h' },
526 { "version", no_argument, NULL, 'V' },
527 { "bind", required_argument, NULL, 'b' },
528 { "port", required_argument, NULL, 'p' },
529 { "socket", required_argument, NULL, 'k' },
530 { "offset", required_argument, NULL, 'o' },
531 { "read-only", no_argument, NULL, 'r' },
532 { "bitmap", required_argument, NULL, 'B' },
533 { "connect", required_argument, NULL, 'c' },
534 { "disconnect", no_argument, NULL, 'd' },
535 { "list", no_argument, NULL, 'L' },
536 { "snapshot", no_argument, NULL, 's' },
537 { "load-snapshot", required_argument, NULL, 'l' },
538 { "nocache", no_argument, NULL, 'n' },
539 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
540 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
541 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
542 { "detect-zeroes", required_argument, NULL,
543 QEMU_NBD_OPT_DETECT_ZEROES },
544 { "shared", required_argument, NULL, 'e' },
545 { "format", required_argument, NULL, 'f' },
546 { "persistent", no_argument, NULL, 't' },
547 { "verbose", no_argument, NULL, 'v' },
548 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
549 { "export-name", required_argument, NULL, 'x' },
550 { "description", required_argument, NULL, 'D' },
551 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
552 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
553 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
554 { "trace", required_argument, NULL, 'T' },
555 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
556 { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE },
557 { NULL, 0, NULL, 0 }
558 };
559 int ch;
560 int opt_ind = 0;
561 int flags = BDRV_O_RDWR;
562 int ret = 0;
563 bool seen_cache = false;
564 bool seen_discard = false;
565 bool seen_aio = false;
566 pthread_t client_thread;
567 const char *fmt = NULL;
568 Error *local_err = NULL;
569 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
570 QDict *options = NULL;
571 const char *export_name = NULL; /* defaults to "" later for server mode */
572 const char *export_description = NULL;
573 const char *bitmap = NULL;
574 const char *tlscredsid = NULL;
575 bool imageOpts = false;
576 bool writethrough = true;
577 char *trace_file = NULL;
578 bool fork_process = false;
579 bool list = false;
580 int old_stderr = -1;
581 unsigned socket_activation;
582 const char *pid_file_name = NULL;
583
584 #if HAVE_NBD_DEVICE
585 /* The client thread uses SIGTERM to interrupt the server. A signal
586 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
587 */
588 struct sigaction sa_sigterm;
589 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
590 sa_sigterm.sa_handler = termsig_handler;
591 sigaction(SIGTERM, &sa_sigterm, NULL);
592 #endif /* HAVE_NBD_DEVICE */
593
594 #ifdef CONFIG_POSIX
595 signal(SIGPIPE, SIG_IGN);
596 #endif
597
598 socket_init();
599 error_init(argv[0]);
600 module_call_init(MODULE_INIT_TRACE);
601 qcrypto_init(&error_fatal);
602
603 module_call_init(MODULE_INIT_QOM);
604 qemu_add_opts(&qemu_object_opts);
605 qemu_add_opts(&qemu_trace_opts);
606 qemu_init_exec_dir(argv[0]);
607
608 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
609 switch (ch) {
610 case 's':
611 flags |= BDRV_O_SNAPSHOT;
612 break;
613 case 'n':
614 optarg = (char *) "none";
615 /* fallthrough */
616 case QEMU_NBD_OPT_CACHE:
617 if (seen_cache) {
618 error_report("-n and --cache can only be specified once");
619 exit(EXIT_FAILURE);
620 }
621 seen_cache = true;
622 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
623 error_report("Invalid cache mode `%s'", optarg);
624 exit(EXIT_FAILURE);
625 }
626 break;
627 case QEMU_NBD_OPT_AIO:
628 if (seen_aio) {
629 error_report("--aio can only be specified once");
630 exit(EXIT_FAILURE);
631 }
632 seen_aio = true;
633 if (bdrv_parse_aio(optarg, &flags) < 0) {
634 error_report("Invalid aio mode '%s'", optarg);
635 exit(EXIT_FAILURE);
636 }
637 break;
638 case QEMU_NBD_OPT_DISCARD:
639 if (seen_discard) {
640 error_report("--discard can only be specified once");
641 exit(EXIT_FAILURE);
642 }
643 seen_discard = true;
644 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
645 error_report("Invalid discard mode `%s'", optarg);
646 exit(EXIT_FAILURE);
647 }
648 break;
649 case QEMU_NBD_OPT_DETECT_ZEROES:
650 detect_zeroes =
651 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
652 optarg,
653 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
654 &local_err);
655 if (local_err) {
656 error_reportf_err(local_err,
657 "Failed to parse detect_zeroes mode: ");
658 exit(EXIT_FAILURE);
659 }
660 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
661 !(flags & BDRV_O_UNMAP)) {
662 error_report("setting detect-zeroes to unmap is not allowed "
663 "without setting discard operation to unmap");
664 exit(EXIT_FAILURE);
665 }
666 break;
667 case 'b':
668 bindto = optarg;
669 break;
670 case 'p':
671 port = optarg;
672 break;
673 case 'o':
674 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
675 error_report("Invalid offset '%s'", optarg);
676 exit(EXIT_FAILURE);
677 }
678 break;
679 case 'l':
680 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
681 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
682 optarg, false);
683 if (!sn_opts) {
684 error_report("Failed in parsing snapshot param `%s'",
685 optarg);
686 exit(EXIT_FAILURE);
687 }
688 } else {
689 sn_id_or_name = optarg;
690 }
691 /* fall through */
692 case 'r':
693 readonly = true;
694 flags &= ~BDRV_O_RDWR;
695 break;
696 case 'B':
697 bitmap = optarg;
698 break;
699 case 'k':
700 sockpath = optarg;
701 if (sockpath[0] != '/') {
702 error_report("socket path must be absolute");
703 exit(EXIT_FAILURE);
704 }
705 break;
706 case 'd':
707 disconnect = true;
708 break;
709 case 'c':
710 device = optarg;
711 break;
712 case 'e':
713 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
714 shared < 1) {
715 error_report("Invalid shared device number '%s'", optarg);
716 exit(EXIT_FAILURE);
717 }
718 break;
719 case 'f':
720 fmt = optarg;
721 break;
722 case 't':
723 persistent = 1;
724 break;
725 case 'x':
726 export_name = optarg;
727 if (strlen(export_name) > NBD_MAX_STRING_SIZE) {
728 error_report("export name '%s' too long", export_name);
729 exit(EXIT_FAILURE);
730 }
731 break;
732 case 'D':
733 export_description = optarg;
734 if (strlen(export_description) > NBD_MAX_STRING_SIZE) {
735 error_report("export description '%s' too long",
736 export_description);
737 exit(EXIT_FAILURE);
738 }
739 break;
740 case 'v':
741 verbose = 1;
742 break;
743 case 'V':
744 version(argv[0]);
745 exit(0);
746 break;
747 case 'h':
748 usage(argv[0]);
749 exit(0);
750 break;
751 case '?':
752 error_report("Try `%s --help' for more information.", argv[0]);
753 exit(EXIT_FAILURE);
754 case QEMU_NBD_OPT_OBJECT: {
755 QemuOpts *opts;
756 opts = qemu_opts_parse_noisily(&qemu_object_opts,
757 optarg, true);
758 if (!opts) {
759 exit(EXIT_FAILURE);
760 }
761 } break;
762 case QEMU_NBD_OPT_TLSCREDS:
763 tlscredsid = optarg;
764 break;
765 case QEMU_NBD_OPT_IMAGE_OPTS:
766 imageOpts = true;
767 break;
768 case 'T':
769 g_free(trace_file);
770 trace_file = trace_opt_parse(optarg);
771 break;
772 case QEMU_NBD_OPT_TLSAUTHZ:
773 tlsauthz = optarg;
774 break;
775 case QEMU_NBD_OPT_FORK:
776 fork_process = true;
777 break;
778 case 'L':
779 list = true;
780 break;
781 case QEMU_NBD_OPT_PID_FILE:
782 pid_file_name = optarg;
783 break;
784 }
785 }
786
787 if (list) {
788 if (argc != optind) {
789 error_report("List mode is incompatible with a file name");
790 exit(EXIT_FAILURE);
791 }
792 if (export_name || export_description || dev_offset ||
793 device || disconnect || fmt || sn_id_or_name || bitmap ||
794 seen_aio || seen_discard || seen_cache) {
795 error_report("List mode is incompatible with per-device settings");
796 exit(EXIT_FAILURE);
797 }
798 if (fork_process) {
799 error_report("List mode is incompatible with forking");
800 exit(EXIT_FAILURE);
801 }
802 } else if ((argc - optind) != 1) {
803 error_report("Invalid number of arguments");
804 error_printf("Try `%s --help' for more information.\n", argv[0]);
805 exit(EXIT_FAILURE);
806 } else if (!export_name) {
807 export_name = "";
808 }
809
810 qemu_opts_foreach(&qemu_object_opts,
811 user_creatable_add_opts_foreach,
812 qemu_nbd_object_print_help, &error_fatal);
813
814 if (!trace_init_backends()) {
815 exit(1);
816 }
817 trace_init_file(trace_file);
818 qemu_set_log(LOG_TRACE);
819
820 socket_activation = check_socket_activation();
821 if (socket_activation == 0) {
822 setup_address_and_port(&bindto, &port);
823 } else {
824 /* Using socket activation - check user didn't use -p etc. */
825 const char *err_msg = socket_activation_validate_opts(device, sockpath,
826 bindto, port,
827 list);
828 if (err_msg != NULL) {
829 error_report("%s", err_msg);
830 exit(EXIT_FAILURE);
831 }
832
833 /* qemu-nbd can only listen on a single socket. */
834 if (socket_activation > 1) {
835 error_report("qemu-nbd does not support socket activation with %s > 1",
836 "LISTEN_FDS");
837 exit(EXIT_FAILURE);
838 }
839 }
840
841 if (tlscredsid) {
842 if (sockpath) {
843 error_report("TLS is only supported with IPv4/IPv6");
844 exit(EXIT_FAILURE);
845 }
846 if (device) {
847 error_report("TLS is not supported with a host device");
848 exit(EXIT_FAILURE);
849 }
850 if (tlsauthz && list) {
851 error_report("TLS authorization is incompatible with export list");
852 exit(EXIT_FAILURE);
853 }
854 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
855 if (local_err) {
856 error_reportf_err(local_err, "Failed to get TLS creds: ");
857 exit(EXIT_FAILURE);
858 }
859 } else {
860 if (tlsauthz) {
861 error_report("--tls-authz is not permitted without --tls-creds");
862 exit(EXIT_FAILURE);
863 }
864 }
865
866 if (list) {
867 saddr = nbd_build_socket_address(sockpath, bindto, port);
868 return qemu_nbd_client_list(saddr, tlscreds, bindto);
869 }
870
871 #if !HAVE_NBD_DEVICE
872 if (disconnect || device) {
873 error_report("Kernel /dev/nbdN support not available");
874 exit(EXIT_FAILURE);
875 }
876 #else /* HAVE_NBD_DEVICE */
877 if (disconnect) {
878 int nbdfd = open(argv[optind], O_RDWR);
879 if (nbdfd < 0) {
880 error_report("Cannot open %s: %s", argv[optind],
881 strerror(errno));
882 exit(EXIT_FAILURE);
883 }
884 nbd_disconnect(nbdfd);
885
886 close(nbdfd);
887
888 printf("%s disconnected\n", argv[optind]);
889
890 return 0;
891 }
892 #endif
893
894 if ((device && !verbose) || fork_process) {
895 #ifndef WIN32
896 int stderr_fd[2];
897 pid_t pid;
898 int ret;
899
900 if (qemu_pipe(stderr_fd) < 0) {
901 error_report("Error setting up communication pipe: %s",
902 strerror(errno));
903 exit(EXIT_FAILURE);
904 }
905
906 /* Now daemonize, but keep a communication channel open to
907 * print errors and exit with the proper status code.
908 */
909 pid = fork();
910 if (pid < 0) {
911 error_report("Failed to fork: %s", strerror(errno));
912 exit(EXIT_FAILURE);
913 } else if (pid == 0) {
914 close(stderr_fd[0]);
915
916 /* Remember parent's stderr if we will be restoring it. */
917 if (fork_process) {
918 old_stderr = dup(STDERR_FILENO);
919 }
920
921 ret = qemu_daemon(1, 0);
922
923 /* Temporarily redirect stderr to the parent's pipe... */
924 dup2(stderr_fd[1], STDERR_FILENO);
925 if (ret < 0) {
926 error_report("Failed to daemonize: %s", strerror(errno));
927 exit(EXIT_FAILURE);
928 }
929
930 /* ... close the descriptor we inherited and go on. */
931 close(stderr_fd[1]);
932 } else {
933 bool errors = false;
934 char *buf;
935
936 /* In the parent. Print error messages from the child until
937 * it closes the pipe.
938 */
939 close(stderr_fd[1]);
940 buf = g_malloc(1024);
941 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
942 errors = true;
943 ret = qemu_write_full(STDERR_FILENO, buf, ret);
944 if (ret < 0) {
945 exit(EXIT_FAILURE);
946 }
947 }
948 if (ret < 0) {
949 error_report("Cannot read from daemon: %s",
950 strerror(errno));
951 exit(EXIT_FAILURE);
952 }
953
954 /* Usually the daemon should not print any message.
955 * Exit with zero status in that case.
956 */
957 exit(errors);
958 }
959 #else /* WIN32 */
960 error_report("Unable to fork into background on Windows hosts");
961 exit(EXIT_FAILURE);
962 #endif /* WIN32 */
963 }
964
965 if (device != NULL && sockpath == NULL) {
966 sockpath = g_malloc(128);
967 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
968 }
969
970 server = qio_net_listener_new();
971 if (socket_activation == 0) {
972 saddr = nbd_build_socket_address(sockpath, bindto, port);
973 if (qio_net_listener_open_sync(server, saddr, 1, &local_err) < 0) {
974 object_unref(OBJECT(server));
975 error_report_err(local_err);
976 exit(EXIT_FAILURE);
977 }
978 } else {
979 size_t i;
980 /* See comment in check_socket_activation above. */
981 for (i = 0; i < socket_activation; i++) {
982 QIOChannelSocket *sioc;
983 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
984 &local_err);
985 if (sioc == NULL) {
986 object_unref(OBJECT(server));
987 error_reportf_err(local_err,
988 "Failed to use socket activation: ");
989 exit(EXIT_FAILURE);
990 }
991 qio_net_listener_add(server, sioc);
992 object_unref(OBJECT(sioc));
993 }
994 }
995
996 if (qemu_init_main_loop(&local_err)) {
997 error_report_err(local_err);
998 exit(EXIT_FAILURE);
999 }
1000 bdrv_init();
1001 atexit(qemu_nbd_shutdown);
1002
1003 srcpath = argv[optind];
1004 if (imageOpts) {
1005 QemuOpts *opts;
1006 if (fmt) {
1007 error_report("--image-opts and -f are mutually exclusive");
1008 exit(EXIT_FAILURE);
1009 }
1010 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
1011 if (!opts) {
1012 qemu_opts_reset(&file_opts);
1013 exit(EXIT_FAILURE);
1014 }
1015 options = qemu_opts_to_qdict(opts, NULL);
1016 qemu_opts_reset(&file_opts);
1017 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
1018 } else {
1019 if (fmt) {
1020 options = qdict_new();
1021 qdict_put_str(options, "driver", fmt);
1022 }
1023 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
1024 }
1025
1026 if (!blk) {
1027 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1028 argv[optind]);
1029 exit(EXIT_FAILURE);
1030 }
1031 bs = blk_bs(blk);
1032
1033 if (dev_offset) {
1034 QDict *raw_opts = qdict_new();
1035 qdict_put_str(raw_opts, "driver", "raw");
1036 qdict_put_str(raw_opts, "file", bs->node_name);
1037 qdict_put_int(raw_opts, "offset", dev_offset);
1038 bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal);
1039 blk_remove_bs(blk);
1040 blk_insert_bs(blk, bs, &error_fatal);
1041 bdrv_unref(bs);
1042 }
1043
1044 blk_set_enable_write_cache(blk, !writethrough);
1045
1046 if (sn_opts) {
1047 ret = bdrv_snapshot_load_tmp(bs,
1048 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1049 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1050 &local_err);
1051 } else if (sn_id_or_name) {
1052 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1053 &local_err);
1054 }
1055 if (ret < 0) {
1056 error_reportf_err(local_err, "Failed to load snapshot: ");
1057 exit(EXIT_FAILURE);
1058 }
1059
1060 bs->detect_zeroes = detect_zeroes;
1061
1062 export = nbd_export_new(bs, export_name,
1063 export_description, bitmap, readonly, shared > 1,
1064 writethrough, &error_fatal);
1065
1066 if (device) {
1067 #if HAVE_NBD_DEVICE
1068 int ret;
1069
1070 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1071 if (ret != 0) {
1072 error_report("Failed to create client thread: %s", strerror(ret));
1073 exit(EXIT_FAILURE);
1074 }
1075 #endif
1076 } else {
1077 /* Shut up GCC warnings. */
1078 memset(&client_thread, 0, sizeof(client_thread));
1079 }
1080
1081 nbd_update_server_watch();
1082
1083 if (pid_file_name) {
1084 qemu_write_pidfile(pid_file_name, &error_fatal);
1085 }
1086
1087 /* now when the initialization is (almost) complete, chdir("/")
1088 * to free any busy filesystems */
1089 if (chdir("/") < 0) {
1090 error_report("Could not chdir to root directory: %s",
1091 strerror(errno));
1092 exit(EXIT_FAILURE);
1093 }
1094
1095 if (fork_process) {
1096 dup2(old_stderr, STDERR_FILENO);
1097 close(old_stderr);
1098 }
1099
1100 state = RUNNING;
1101 do {
1102 main_loop_wait(false);
1103 if (state == TERMINATE) {
1104 nbd_export_put(export);
1105 nbd_export_close_all();
1106 export = NULL;
1107 state = TERMINATED;
1108 }
1109 } while (state != TERMINATED);
1110
1111 blk_unref(blk);
1112 if (sockpath) {
1113 unlink(sockpath);
1114 }
1115
1116 qemu_opts_del(sn_opts);
1117
1118 if (device) {
1119 void *ret;
1120 pthread_join(client_thread, &ret);
1121 exit(ret != NULL);
1122 } else {
1123 exit(EXIT_SUCCESS);
1124 }
1125 }