block: User BdrvChild callback for device name
[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 "qapi/error.h"
21 #include "qemu-common.h"
22 #include "qemu/cutils.h"
23 #include "sysemu/block-backend.h"
24 #include "block/block_int.h"
25 #include "block/nbd.h"
26 #include "qemu/main-loop.h"
27 #include "qemu/error-report.h"
28 #include "qemu/config-file.h"
29 #include "block/snapshot.h"
30 #include "qapi/util.h"
31 #include "qapi/qmp/qstring.h"
32 #include "qom/object_interfaces.h"
33 #include "io/channel-socket.h"
34 #include "crypto/init.h"
35
36 #include <getopt.h>
37 #include <libgen.h>
38 #include <pthread.h>
39
40 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
41 #define QEMU_NBD_OPT_CACHE 256
42 #define QEMU_NBD_OPT_AIO 257
43 #define QEMU_NBD_OPT_DISCARD 258
44 #define QEMU_NBD_OPT_DETECT_ZEROES 259
45 #define QEMU_NBD_OPT_OBJECT 260
46 #define QEMU_NBD_OPT_TLSCREDS 261
47 #define QEMU_NBD_OPT_IMAGE_OPTS 262
48
49 #define MBR_SIZE 512
50
51 static NBDExport *exp;
52 static bool newproto;
53 static int verbose;
54 static char *srcpath;
55 static SocketAddress *saddr;
56 static int persistent = 0;
57 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
58 static int shared = 1;
59 static int nb_fds;
60 static QIOChannelSocket *server_ioc;
61 static int server_watch = -1;
62 static QCryptoTLSCreds *tlscreds;
63
64 static void usage(const char *name)
65 {
66 (printf) (
67 "Usage: %s [OPTIONS] FILE\n"
68 "QEMU Disk Network Block Device Server\n"
69 "\n"
70 " -h, --help display this help and exit\n"
71 " -V, --version output version information and exit\n"
72 "\n"
73 "Connection properties:\n"
74 " -p, --port=PORT port to listen on (default `%d')\n"
75 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
76 " -k, --socket=PATH path to the unix socket\n"
77 " (default '"SOCKET_PATH"')\n"
78 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
79 " -t, --persistent don't exit on the last connection\n"
80 " -v, --verbose display extra debugging information\n"
81 " -x, --export-name=NAME expose export by name\n"
82 "\n"
83 "Exposing part of the image:\n"
84 " -o, --offset=OFFSET offset into the image\n"
85 " -P, --partition=NUM only expose partition NUM\n"
86 "\n"
87 "General purpose options:\n"
88 " --object type,id=ID,... define an object such as 'secret' for providing\n"
89 " passwords and/or encryption keys\n"
90 #ifdef __linux__
91 "Kernel NBD client support:\n"
92 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
93 " -d, --disconnect disconnect the specified device\n"
94 "\n"
95 #endif
96 "\n"
97 "Block device options:\n"
98 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
99 " -r, --read-only export read-only\n"
100 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
101 " file with backing_file=FILE, redirect the write to\n"
102 " the temporary one\n"
103 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
104 " load an internal snapshot inside FILE and export it\n"
105 " as an read-only device, SNAPSHOT_PARAM format is\n"
106 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
107 " '[ID_OR_NAME]'\n"
108 " -n, --nocache disable host cache\n"
109 " --cache=MODE set cache mode (none, writeback, ...)\n"
110 " --aio=MODE set AIO mode (native or threads)\n"
111 " --discard=MODE set discard mode (ignore, unmap)\n"
112 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
113 " --image-opts treat FILE as a full set of image options\n"
114 "\n"
115 "Report bugs to <qemu-devel@nongnu.org>\n"
116 , name, NBD_DEFAULT_PORT, "DEVICE");
117 }
118
119 static void version(const char *name)
120 {
121 printf(
122 "%s version 0.0.1\n"
123 "Written by Anthony Liguori.\n"
124 "\n"
125 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
126 "This is free software; see the source for copying conditions. There is NO\n"
127 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
128 , name);
129 }
130
131 struct partition_record
132 {
133 uint8_t bootable;
134 uint8_t start_head;
135 uint32_t start_cylinder;
136 uint8_t start_sector;
137 uint8_t system;
138 uint8_t end_head;
139 uint8_t end_cylinder;
140 uint8_t end_sector;
141 uint32_t start_sector_abs;
142 uint32_t nb_sectors_abs;
143 };
144
145 static void read_partition(uint8_t *p, struct partition_record *r)
146 {
147 r->bootable = p[0];
148 r->start_head = p[1];
149 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
150 r->start_sector = p[2] & 0x3f;
151 r->system = p[4];
152 r->end_head = p[5];
153 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
154 r->end_sector = p[6] & 0x3f;
155
156 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8));
157 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12));
158 }
159
160 static int find_partition(BlockBackend *blk, int partition,
161 off_t *offset, off_t *size)
162 {
163 struct partition_record mbr[4];
164 uint8_t data[MBR_SIZE];
165 int i;
166 int ext_partnum = 4;
167 int ret;
168
169 ret = blk_pread(blk, 0, data, sizeof(data));
170 if (ret < 0) {
171 error_report("error while reading: %s", strerror(-ret));
172 exit(EXIT_FAILURE);
173 }
174
175 if (data[510] != 0x55 || data[511] != 0xaa) {
176 return -EINVAL;
177 }
178
179 for (i = 0; i < 4; i++) {
180 read_partition(&data[446 + 16 * i], &mbr[i]);
181
182 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
183 continue;
184 }
185
186 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
187 struct partition_record ext[4];
188 uint8_t data1[MBR_SIZE];
189 int j;
190
191 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
192 data1, sizeof(data1));
193 if (ret < 0) {
194 error_report("error while reading: %s", strerror(-ret));
195 exit(EXIT_FAILURE);
196 }
197
198 for (j = 0; j < 4; j++) {
199 read_partition(&data1[446 + 16 * j], &ext[j]);
200 if (!ext[j].system || !ext[j].nb_sectors_abs) {
201 continue;
202 }
203
204 if ((ext_partnum + j + 1) == partition) {
205 *offset = (uint64_t)ext[j].start_sector_abs << 9;
206 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
207 return 0;
208 }
209 }
210 ext_partnum += 4;
211 } else if ((i + 1) == partition) {
212 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
213 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
214 return 0;
215 }
216 }
217
218 return -ENOENT;
219 }
220
221 static void termsig_handler(int signum)
222 {
223 atomic_cmpxchg(&state, RUNNING, TERMINATE);
224 qemu_notify_event();
225 }
226
227
228 static void *show_parts(void *arg)
229 {
230 char *device = arg;
231 int nbd;
232
233 /* linux just needs an open() to trigger
234 * the partition table update
235 * but remember to load the module with max_part != 0 :
236 * modprobe nbd max_part=63
237 */
238 nbd = open(device, O_RDWR);
239 if (nbd >= 0) {
240 close(nbd);
241 }
242 return NULL;
243 }
244
245 static void *nbd_client_thread(void *arg)
246 {
247 char *device = arg;
248 off_t size;
249 uint32_t nbdflags;
250 QIOChannelSocket *sioc;
251 int fd;
252 int ret;
253 pthread_t show_parts_thread;
254 Error *local_error = NULL;
255
256 sioc = qio_channel_socket_new();
257 if (qio_channel_socket_connect_sync(sioc,
258 saddr,
259 &local_error) < 0) {
260 error_report_err(local_error);
261 goto out;
262 }
263
264 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags,
265 NULL, NULL, NULL,
266 &size, &local_error);
267 if (ret < 0) {
268 if (local_error) {
269 error_report_err(local_error);
270 }
271 goto out_socket;
272 }
273
274 fd = open(device, O_RDWR);
275 if (fd < 0) {
276 /* Linux-only, we can use %m in printf. */
277 error_report("Failed to open %s: %m", device);
278 goto out_socket;
279 }
280
281 ret = nbd_init(fd, sioc, nbdflags, size);
282 if (ret < 0) {
283 goto out_fd;
284 }
285
286 /* update partition table */
287 pthread_create(&show_parts_thread, NULL, show_parts, device);
288
289 if (verbose) {
290 fprintf(stderr, "NBD device %s is now connected to %s\n",
291 device, srcpath);
292 } else {
293 /* Close stderr so that the qemu-nbd process exits. */
294 dup2(STDOUT_FILENO, STDERR_FILENO);
295 }
296
297 ret = nbd_client(fd);
298 if (ret) {
299 goto out_fd;
300 }
301 close(fd);
302 object_unref(OBJECT(sioc));
303 kill(getpid(), SIGTERM);
304 return (void *) EXIT_SUCCESS;
305
306 out_fd:
307 close(fd);
308 out_socket:
309 object_unref(OBJECT(sioc));
310 out:
311 kill(getpid(), SIGTERM);
312 return (void *) EXIT_FAILURE;
313 }
314
315 static int nbd_can_accept(void)
316 {
317 return nb_fds < shared;
318 }
319
320 static void nbd_export_closed(NBDExport *exp)
321 {
322 assert(state == TERMINATING);
323 state = TERMINATED;
324 }
325
326 static void nbd_update_server_watch(void);
327
328 static void nbd_client_closed(NBDClient *client)
329 {
330 nb_fds--;
331 if (nb_fds == 0 && !persistent && state == RUNNING) {
332 state = TERMINATE;
333 }
334 nbd_update_server_watch();
335 nbd_client_put(client);
336 }
337
338 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
339 {
340 QIOChannelSocket *cioc;
341
342 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
343 NULL);
344 if (!cioc) {
345 return TRUE;
346 }
347
348 if (state >= TERMINATE) {
349 object_unref(OBJECT(cioc));
350 return TRUE;
351 }
352
353 nb_fds++;
354 nbd_update_server_watch();
355 nbd_client_new(newproto ? NULL : exp, cioc,
356 tlscreds, NULL, nbd_client_closed);
357 object_unref(OBJECT(cioc));
358
359 return TRUE;
360 }
361
362 static void nbd_update_server_watch(void)
363 {
364 if (nbd_can_accept()) {
365 if (server_watch == -1) {
366 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
367 G_IO_IN,
368 nbd_accept,
369 NULL, NULL);
370 }
371 } else {
372 if (server_watch != -1) {
373 g_source_remove(server_watch);
374 server_watch = -1;
375 }
376 }
377 }
378
379
380 static 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_KIND_UNIX;
389 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
390 saddr->u.q_unix.data->path = g_strdup(sockpath);
391 } else {
392 InetSocketAddress *inet;
393 saddr->type = SOCKET_ADDRESS_KIND_INET;
394 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
395 inet->host = g_strdup(bindto);
396 if (port) {
397 inet->port = g_strdup(port);
398 } else {
399 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
400 }
401 }
402
403 return saddr;
404 }
405
406
407 static QemuOptsList file_opts = {
408 .name = "file",
409 .implied_opt_name = "file",
410 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
411 .desc = {
412 /* no elements => accept any params */
413 { /* end of list */ }
414 },
415 };
416
417 static QemuOptsList qemu_object_opts = {
418 .name = "object",
419 .implied_opt_name = "qom-type",
420 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
421 .desc = {
422 { }
423 },
424 };
425
426
427
428 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
429 {
430 Object *obj;
431 QCryptoTLSCreds *creds;
432
433 obj = object_resolve_path_component(
434 object_get_objects_root(), id);
435 if (!obj) {
436 error_setg(errp, "No TLS credentials with id '%s'",
437 id);
438 return NULL;
439 }
440 creds = (QCryptoTLSCreds *)
441 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
442 if (!creds) {
443 error_setg(errp, "Object with id '%s' is not TLS credentials",
444 id);
445 return NULL;
446 }
447
448 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
449 error_setg(errp,
450 "Expecting TLS credentials with a server endpoint");
451 return NULL;
452 }
453 object_ref(obj);
454 return creds;
455 }
456
457
458 int main(int argc, char **argv)
459 {
460 BlockBackend *blk;
461 BlockDriverState *bs;
462 off_t dev_offset = 0;
463 uint32_t nbdflags = 0;
464 bool disconnect = false;
465 const char *bindto = "0.0.0.0";
466 const char *port = NULL;
467 char *sockpath = NULL;
468 char *device = NULL;
469 off_t fd_size;
470 QemuOpts *sn_opts = NULL;
471 const char *sn_id_or_name = NULL;
472 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:";
473 struct option lopt[] = {
474 { "help", no_argument, NULL, 'h' },
475 { "version", no_argument, NULL, 'V' },
476 { "bind", required_argument, NULL, 'b' },
477 { "port", required_argument, NULL, 'p' },
478 { "socket", required_argument, NULL, 'k' },
479 { "offset", required_argument, NULL, 'o' },
480 { "read-only", no_argument, NULL, 'r' },
481 { "partition", required_argument, NULL, 'P' },
482 { "connect", required_argument, NULL, 'c' },
483 { "disconnect", no_argument, NULL, 'd' },
484 { "snapshot", no_argument, NULL, 's' },
485 { "load-snapshot", required_argument, NULL, 'l' },
486 { "nocache", no_argument, NULL, 'n' },
487 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
488 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
489 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
490 { "detect-zeroes", required_argument, NULL,
491 QEMU_NBD_OPT_DETECT_ZEROES },
492 { "shared", required_argument, NULL, 'e' },
493 { "format", required_argument, NULL, 'f' },
494 { "persistent", no_argument, NULL, 't' },
495 { "verbose", no_argument, NULL, 'v' },
496 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
497 { "export-name", required_argument, NULL, 'x' },
498 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
499 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
500 { NULL, 0, NULL, 0 }
501 };
502 int ch;
503 int opt_ind = 0;
504 char *end;
505 int flags = BDRV_O_RDWR;
506 int partition = -1;
507 int ret = 0;
508 bool seen_cache = false;
509 bool seen_discard = false;
510 bool seen_aio = false;
511 pthread_t client_thread;
512 const char *fmt = NULL;
513 Error *local_err = NULL;
514 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
515 QDict *options = NULL;
516 const char *export_name = NULL;
517 const char *tlscredsid = NULL;
518 bool imageOpts = false;
519 bool writethrough = true;
520
521 /* The client thread uses SIGTERM to interrupt the server. A signal
522 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
523 */
524 struct sigaction sa_sigterm;
525 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
526 sa_sigterm.sa_handler = termsig_handler;
527 sigaction(SIGTERM, &sa_sigterm, NULL);
528
529 if (qcrypto_init(&local_err) < 0) {
530 error_reportf_err(local_err, "cannot initialize crypto: ");
531 exit(1);
532 }
533
534 module_call_init(MODULE_INIT_QOM);
535 qemu_add_opts(&qemu_object_opts);
536 qemu_init_exec_dir(argv[0]);
537
538 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
539 switch (ch) {
540 case 's':
541 flags |= BDRV_O_SNAPSHOT;
542 break;
543 case 'n':
544 optarg = (char *) "none";
545 /* fallthrough */
546 case QEMU_NBD_OPT_CACHE:
547 if (seen_cache) {
548 error_report("-n and --cache can only be specified once");
549 exit(EXIT_FAILURE);
550 }
551 seen_cache = true;
552 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
553 error_report("Invalid cache mode `%s'", optarg);
554 exit(EXIT_FAILURE);
555 }
556 break;
557 case QEMU_NBD_OPT_AIO:
558 if (seen_aio) {
559 error_report("--aio can only be specified once");
560 exit(EXIT_FAILURE);
561 }
562 seen_aio = true;
563 if (!strcmp(optarg, "native")) {
564 flags |= BDRV_O_NATIVE_AIO;
565 } else if (!strcmp(optarg, "threads")) {
566 /* this is the default */
567 } else {
568 error_report("invalid aio mode `%s'", optarg);
569 exit(EXIT_FAILURE);
570 }
571 break;
572 case QEMU_NBD_OPT_DISCARD:
573 if (seen_discard) {
574 error_report("--discard can only be specified once");
575 exit(EXIT_FAILURE);
576 }
577 seen_discard = true;
578 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
579 error_report("Invalid discard mode `%s'", optarg);
580 exit(EXIT_FAILURE);
581 }
582 break;
583 case QEMU_NBD_OPT_DETECT_ZEROES:
584 detect_zeroes =
585 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
586 optarg,
587 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
588 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
589 &local_err);
590 if (local_err) {
591 error_reportf_err(local_err,
592 "Failed to parse detect_zeroes mode: ");
593 exit(EXIT_FAILURE);
594 }
595 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
596 !(flags & BDRV_O_UNMAP)) {
597 error_report("setting detect-zeroes to unmap is not allowed "
598 "without setting discard operation to unmap");
599 exit(EXIT_FAILURE);
600 }
601 break;
602 case 'b':
603 bindto = optarg;
604 break;
605 case 'p':
606 port = optarg;
607 break;
608 case 'o':
609 dev_offset = strtoll (optarg, &end, 0);
610 if (*end) {
611 error_report("Invalid offset `%s'", optarg);
612 exit(EXIT_FAILURE);
613 }
614 if (dev_offset < 0) {
615 error_report("Offset must be positive `%s'", optarg);
616 exit(EXIT_FAILURE);
617 }
618 break;
619 case 'l':
620 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
621 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
622 optarg, false);
623 if (!sn_opts) {
624 error_report("Failed in parsing snapshot param `%s'",
625 optarg);
626 exit(EXIT_FAILURE);
627 }
628 } else {
629 sn_id_or_name = optarg;
630 }
631 /* fall through */
632 case 'r':
633 nbdflags |= NBD_FLAG_READ_ONLY;
634 flags &= ~BDRV_O_RDWR;
635 break;
636 case 'P':
637 partition = strtol(optarg, &end, 0);
638 if (*end) {
639 error_report("Invalid partition `%s'", optarg);
640 exit(EXIT_FAILURE);
641 }
642 if (partition < 1 || partition > 8) {
643 error_report("Invalid partition %d", partition);
644 exit(EXIT_FAILURE);
645 }
646 break;
647 case 'k':
648 sockpath = optarg;
649 if (sockpath[0] != '/') {
650 error_report("socket path must be absolute");
651 exit(EXIT_FAILURE);
652 }
653 break;
654 case 'd':
655 disconnect = true;
656 break;
657 case 'c':
658 device = optarg;
659 break;
660 case 'e':
661 shared = strtol(optarg, &end, 0);
662 if (*end) {
663 error_report("Invalid shared device number '%s'", optarg);
664 exit(EXIT_FAILURE);
665 }
666 if (shared < 1) {
667 error_report("Shared device number must be greater than 0");
668 exit(EXIT_FAILURE);
669 }
670 break;
671 case 'f':
672 fmt = optarg;
673 break;
674 case 't':
675 persistent = 1;
676 break;
677 case 'x':
678 export_name = optarg;
679 break;
680 case 'v':
681 verbose = 1;
682 break;
683 case 'V':
684 version(argv[0]);
685 exit(0);
686 break;
687 case 'h':
688 usage(argv[0]);
689 exit(0);
690 break;
691 case '?':
692 error_report("Try `%s --help' for more information.", argv[0]);
693 exit(EXIT_FAILURE);
694 case QEMU_NBD_OPT_OBJECT: {
695 QemuOpts *opts;
696 opts = qemu_opts_parse_noisily(&qemu_object_opts,
697 optarg, true);
698 if (!opts) {
699 exit(EXIT_FAILURE);
700 }
701 } break;
702 case QEMU_NBD_OPT_TLSCREDS:
703 tlscredsid = optarg;
704 break;
705 case QEMU_NBD_OPT_IMAGE_OPTS:
706 imageOpts = true;
707 break;
708 }
709 }
710
711 if ((argc - optind) != 1) {
712 error_report("Invalid number of arguments");
713 error_printf("Try `%s --help' for more information.\n", argv[0]);
714 exit(EXIT_FAILURE);
715 }
716
717 if (qemu_opts_foreach(&qemu_object_opts,
718 user_creatable_add_opts_foreach,
719 NULL, NULL)) {
720 exit(EXIT_FAILURE);
721 }
722
723 if (tlscredsid) {
724 if (sockpath) {
725 error_report("TLS is only supported with IPv4/IPv6");
726 exit(EXIT_FAILURE);
727 }
728 if (device) {
729 error_report("TLS is not supported with a host device");
730 exit(EXIT_FAILURE);
731 }
732 if (!export_name) {
733 /* Set the default NBD protocol export name, since
734 * we *must* use new style protocol for TLS */
735 export_name = "";
736 }
737 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
738 if (local_err) {
739 error_report("Failed to get TLS creds %s",
740 error_get_pretty(local_err));
741 exit(EXIT_FAILURE);
742 }
743 }
744
745 if (disconnect) {
746 int nbdfd = open(argv[optind], O_RDWR);
747 if (nbdfd < 0) {
748 error_report("Cannot open %s: %s", argv[optind],
749 strerror(errno));
750 exit(EXIT_FAILURE);
751 }
752 nbd_disconnect(nbdfd);
753
754 close(nbdfd);
755
756 printf("%s disconnected\n", argv[optind]);
757
758 return 0;
759 }
760
761 if (device && !verbose) {
762 int stderr_fd[2];
763 pid_t pid;
764 int ret;
765
766 if (qemu_pipe(stderr_fd) < 0) {
767 error_report("Error setting up communication pipe: %s",
768 strerror(errno));
769 exit(EXIT_FAILURE);
770 }
771
772 /* Now daemonize, but keep a communication channel open to
773 * print errors and exit with the proper status code.
774 */
775 pid = fork();
776 if (pid < 0) {
777 error_report("Failed to fork: %s", strerror(errno));
778 exit(EXIT_FAILURE);
779 } else if (pid == 0) {
780 close(stderr_fd[0]);
781 ret = qemu_daemon(1, 0);
782
783 /* Temporarily redirect stderr to the parent's pipe... */
784 dup2(stderr_fd[1], STDERR_FILENO);
785 if (ret < 0) {
786 error_report("Failed to daemonize: %s", strerror(errno));
787 exit(EXIT_FAILURE);
788 }
789
790 /* ... close the descriptor we inherited and go on. */
791 close(stderr_fd[1]);
792 } else {
793 bool errors = false;
794 char *buf;
795
796 /* In the parent. Print error messages from the child until
797 * it closes the pipe.
798 */
799 close(stderr_fd[1]);
800 buf = g_malloc(1024);
801 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
802 errors = true;
803 ret = qemu_write_full(STDERR_FILENO, buf, ret);
804 if (ret < 0) {
805 exit(EXIT_FAILURE);
806 }
807 }
808 if (ret < 0) {
809 error_report("Cannot read from daemon: %s",
810 strerror(errno));
811 exit(EXIT_FAILURE);
812 }
813
814 /* Usually the daemon should not print any message.
815 * Exit with zero status in that case.
816 */
817 exit(errors);
818 }
819 }
820
821 if (device != NULL && sockpath == NULL) {
822 sockpath = g_malloc(128);
823 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
824 }
825
826 saddr = nbd_build_socket_address(sockpath, bindto, port);
827
828 if (qemu_init_main_loop(&local_err)) {
829 error_report_err(local_err);
830 exit(EXIT_FAILURE);
831 }
832 bdrv_init();
833 atexit(bdrv_close_all);
834
835 srcpath = argv[optind];
836 if (imageOpts) {
837 QemuOpts *opts;
838 if (fmt) {
839 error_report("--image-opts and -f are mutually exclusive");
840 exit(EXIT_FAILURE);
841 }
842 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
843 if (!opts) {
844 qemu_opts_reset(&file_opts);
845 exit(EXIT_FAILURE);
846 }
847 options = qemu_opts_to_qdict(opts, NULL);
848 qemu_opts_reset(&file_opts);
849 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
850 } else {
851 if (fmt) {
852 options = qdict_new();
853 qdict_put(options, "driver", qstring_from_str(fmt));
854 }
855 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
856 }
857
858 if (!blk) {
859 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
860 argv[optind]);
861 exit(EXIT_FAILURE);
862 }
863 bs = blk_bs(blk);
864
865 blk_set_enable_write_cache(blk, !writethrough);
866
867 if (sn_opts) {
868 ret = bdrv_snapshot_load_tmp(bs,
869 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
870 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
871 &local_err);
872 } else if (sn_id_or_name) {
873 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
874 &local_err);
875 }
876 if (ret < 0) {
877 error_reportf_err(local_err, "Failed to load snapshot: ");
878 exit(EXIT_FAILURE);
879 }
880
881 bs->detect_zeroes = detect_zeroes;
882 fd_size = blk_getlength(blk);
883 if (fd_size < 0) {
884 error_report("Failed to determine the image length: %s",
885 strerror(-fd_size));
886 exit(EXIT_FAILURE);
887 }
888
889 if (partition != -1) {
890 ret = find_partition(blk, partition, &dev_offset, &fd_size);
891 if (ret < 0) {
892 error_report("Could not find partition %d: %s", partition,
893 strerror(-ret));
894 exit(EXIT_FAILURE);
895 }
896 }
897
898 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed,
899 &local_err);
900 if (!exp) {
901 error_report_err(local_err);
902 exit(EXIT_FAILURE);
903 }
904 if (export_name) {
905 nbd_export_set_name(exp, export_name);
906 newproto = true;
907 }
908
909 server_ioc = qio_channel_socket_new();
910 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
911 object_unref(OBJECT(server_ioc));
912 error_report_err(local_err);
913 return 1;
914 }
915
916 if (device) {
917 int ret;
918
919 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
920 if (ret != 0) {
921 error_report("Failed to create client thread: %s", strerror(ret));
922 exit(EXIT_FAILURE);
923 }
924 } else {
925 /* Shut up GCC warnings. */
926 memset(&client_thread, 0, sizeof(client_thread));
927 }
928
929 nbd_update_server_watch();
930
931 /* now when the initialization is (almost) complete, chdir("/")
932 * to free any busy filesystems */
933 if (chdir("/") < 0) {
934 error_report("Could not chdir to root directory: %s",
935 strerror(errno));
936 exit(EXIT_FAILURE);
937 }
938
939 state = RUNNING;
940 do {
941 main_loop_wait(false);
942 if (state == TERMINATE) {
943 state = TERMINATING;
944 nbd_export_close(exp);
945 nbd_export_put(exp);
946 exp = NULL;
947 }
948 } while (state != TERMINATED);
949
950 blk_unref(blk);
951 if (sockpath) {
952 unlink(sockpath);
953 }
954
955 qemu_opts_del(sn_opts);
956
957 if (device) {
958 void *ret;
959 pthread_join(client_thread, &ret);
960 exit(ret != NULL);
961 } else {
962 exit(EXIT_SUCCESS);
963 }
964 }