ppc: Fix sign extension issue in mtmsr(d) emulation
[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 "qemu/bswap.h"
30 #include "block/snapshot.h"
31 #include "qapi/util.h"
32 #include "qapi/qmp/qstring.h"
33 #include "qom/object_interfaces.h"
34 #include "io/channel-socket.h"
35 #include "crypto/init.h"
36
37 #include <getopt.h>
38 #include <libgen.h>
39 #include <pthread.h>
40
41 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
42 #define QEMU_NBD_OPT_CACHE 256
43 #define QEMU_NBD_OPT_AIO 257
44 #define QEMU_NBD_OPT_DISCARD 258
45 #define QEMU_NBD_OPT_DETECT_ZEROES 259
46 #define QEMU_NBD_OPT_OBJECT 260
47 #define QEMU_NBD_OPT_TLSCREDS 261
48 #define QEMU_NBD_OPT_IMAGE_OPTS 262
49
50 #define MBR_SIZE 512
51
52 static NBDExport *exp;
53 static bool newproto;
54 static int verbose;
55 static char *srcpath;
56 static SocketAddress *saddr;
57 static int persistent = 0;
58 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
59 static int shared = 1;
60 static int nb_fds;
61 static QIOChannelSocket *server_ioc;
62 static int server_watch = -1;
63 static QCryptoTLSCreds *tlscreds;
64
65 static void usage(const char *name)
66 {
67 (printf) (
68 "Usage: %s [OPTIONS] FILE\n"
69 "QEMU Disk Network Block Device Server\n"
70 "\n"
71 " -h, --help display this help and exit\n"
72 " -V, --version output version information and exit\n"
73 "\n"
74 "Connection properties:\n"
75 " -p, --port=PORT port to listen on (default `%d')\n"
76 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
77 " -k, --socket=PATH path to the unix socket\n"
78 " (default '"SOCKET_PATH"')\n"
79 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
80 " -t, --persistent don't exit on the last connection\n"
81 " -v, --verbose display extra debugging information\n"
82 " -x, --export-name=NAME expose export by name\n"
83 "\n"
84 "Exposing part of the image:\n"
85 " -o, --offset=OFFSET offset into the image\n"
86 " -P, --partition=NUM only expose partition NUM\n"
87 "\n"
88 "General purpose options:\n"
89 " --object type,id=ID,... define an object such as 'secret' for providing\n"
90 " passwords and/or encryption keys\n"
91 #ifdef __linux__
92 "Kernel NBD client support:\n"
93 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
94 " -d, --disconnect disconnect the specified device\n"
95 "\n"
96 #endif
97 "\n"
98 "Block device options:\n"
99 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
100 " -r, --read-only export read-only\n"
101 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
102 " file with backing_file=FILE, redirect the write to\n"
103 " the temporary one\n"
104 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
105 " load an internal snapshot inside FILE and export it\n"
106 " as an read-only device, SNAPSHOT_PARAM format is\n"
107 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
108 " '[ID_OR_NAME]'\n"
109 " -n, --nocache disable host cache\n"
110 " --cache=MODE set cache mode (none, writeback, ...)\n"
111 " --aio=MODE set AIO mode (native or threads)\n"
112 " --discard=MODE set discard mode (ignore, unmap)\n"
113 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
114 " --image-opts treat FILE as a full set of image options\n"
115 "\n"
116 "Report bugs to <qemu-devel@nongnu.org>\n"
117 , name, NBD_DEFAULT_PORT, "DEVICE");
118 }
119
120 static void version(const char *name)
121 {
122 printf(
123 "%s version 0.0.1\n"
124 "Written by Anthony Liguori.\n"
125 "\n"
126 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
127 "This is free software; see the source for copying conditions. There is NO\n"
128 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
129 , name);
130 }
131
132 struct partition_record
133 {
134 uint8_t bootable;
135 uint8_t start_head;
136 uint32_t start_cylinder;
137 uint8_t start_sector;
138 uint8_t system;
139 uint8_t end_head;
140 uint8_t end_cylinder;
141 uint8_t end_sector;
142 uint32_t start_sector_abs;
143 uint32_t nb_sectors_abs;
144 };
145
146 static void read_partition(uint8_t *p, struct partition_record *r)
147 {
148 r->bootable = p[0];
149 r->start_head = p[1];
150 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
151 r->start_sector = p[2] & 0x3f;
152 r->system = p[4];
153 r->end_head = p[5];
154 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
155 r->end_sector = p[6] & 0x3f;
156
157 r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8));
158 r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12));
159 }
160
161 static int find_partition(BlockBackend *blk, int partition,
162 off_t *offset, off_t *size)
163 {
164 struct partition_record mbr[4];
165 uint8_t data[MBR_SIZE];
166 int i;
167 int ext_partnum = 4;
168 int ret;
169
170 ret = blk_pread(blk, 0, data, sizeof(data));
171 if (ret < 0) {
172 error_report("error while reading: %s", strerror(-ret));
173 exit(EXIT_FAILURE);
174 }
175
176 if (data[510] != 0x55 || data[511] != 0xaa) {
177 return -EINVAL;
178 }
179
180 for (i = 0; i < 4; i++) {
181 read_partition(&data[446 + 16 * i], &mbr[i]);
182
183 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
184 continue;
185 }
186
187 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
188 struct partition_record ext[4];
189 uint8_t data1[MBR_SIZE];
190 int j;
191
192 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
193 data1, sizeof(data1));
194 if (ret < 0) {
195 error_report("error while reading: %s", strerror(-ret));
196 exit(EXIT_FAILURE);
197 }
198
199 for (j = 0; j < 4; j++) {
200 read_partition(&data1[446 + 16 * j], &ext[j]);
201 if (!ext[j].system || !ext[j].nb_sectors_abs) {
202 continue;
203 }
204
205 if ((ext_partnum + j + 1) == partition) {
206 *offset = (uint64_t)ext[j].start_sector_abs << 9;
207 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
208 return 0;
209 }
210 }
211 ext_partnum += 4;
212 } else if ((i + 1) == partition) {
213 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
214 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
215 return 0;
216 }
217 }
218
219 return -ENOENT;
220 }
221
222 static void termsig_handler(int signum)
223 {
224 atomic_cmpxchg(&state, RUNNING, TERMINATE);
225 qemu_notify_event();
226 }
227
228
229 static void *show_parts(void *arg)
230 {
231 char *device = arg;
232 int nbd;
233
234 /* linux just needs an open() to trigger
235 * the partition table update
236 * but remember to load the module with max_part != 0 :
237 * modprobe nbd max_part=63
238 */
239 nbd = open(device, O_RDWR);
240 if (nbd >= 0) {
241 close(nbd);
242 }
243 return NULL;
244 }
245
246 static void *nbd_client_thread(void *arg)
247 {
248 char *device = arg;
249 off_t size;
250 uint32_t nbdflags;
251 QIOChannelSocket *sioc;
252 int fd;
253 int ret;
254 pthread_t show_parts_thread;
255 Error *local_error = NULL;
256
257 sioc = qio_channel_socket_new();
258 if (qio_channel_socket_connect_sync(sioc,
259 saddr,
260 &local_error) < 0) {
261 error_report_err(local_error);
262 goto out;
263 }
264
265 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags,
266 NULL, NULL, NULL,
267 &size, &local_error);
268 if (ret < 0) {
269 if (local_error) {
270 error_report_err(local_error);
271 }
272 goto out_socket;
273 }
274
275 fd = open(device, O_RDWR);
276 if (fd < 0) {
277 /* Linux-only, we can use %m in printf. */
278 error_report("Failed to open %s: %m", device);
279 goto out_socket;
280 }
281
282 ret = nbd_init(fd, sioc, nbdflags, size);
283 if (ret < 0) {
284 goto out_fd;
285 }
286
287 /* update partition table */
288 pthread_create(&show_parts_thread, NULL, show_parts, device);
289
290 if (verbose) {
291 fprintf(stderr, "NBD device %s is now connected to %s\n",
292 device, srcpath);
293 } else {
294 /* Close stderr so that the qemu-nbd process exits. */
295 dup2(STDOUT_FILENO, STDERR_FILENO);
296 }
297
298 ret = nbd_client(fd);
299 if (ret) {
300 goto out_fd;
301 }
302 close(fd);
303 object_unref(OBJECT(sioc));
304 kill(getpid(), SIGTERM);
305 return (void *) EXIT_SUCCESS;
306
307 out_fd:
308 close(fd);
309 out_socket:
310 object_unref(OBJECT(sioc));
311 out:
312 kill(getpid(), SIGTERM);
313 return (void *) EXIT_FAILURE;
314 }
315
316 static int nbd_can_accept(void)
317 {
318 return nb_fds < shared;
319 }
320
321 static void nbd_export_closed(NBDExport *exp)
322 {
323 assert(state == TERMINATING);
324 state = TERMINATED;
325 }
326
327 static void nbd_update_server_watch(void);
328
329 static void nbd_client_closed(NBDClient *client)
330 {
331 nb_fds--;
332 if (nb_fds == 0 && !persistent && state == RUNNING) {
333 state = TERMINATE;
334 }
335 nbd_update_server_watch();
336 nbd_client_put(client);
337 }
338
339 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
340 {
341 QIOChannelSocket *cioc;
342
343 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
344 NULL);
345 if (!cioc) {
346 return TRUE;
347 }
348
349 if (state >= TERMINATE) {
350 object_unref(OBJECT(cioc));
351 return TRUE;
352 }
353
354 nb_fds++;
355 nbd_update_server_watch();
356 nbd_client_new(newproto ? NULL : exp, cioc,
357 tlscreds, NULL, nbd_client_closed);
358 object_unref(OBJECT(cioc));
359
360 return TRUE;
361 }
362
363 static void nbd_update_server_watch(void)
364 {
365 if (nbd_can_accept()) {
366 if (server_watch == -1) {
367 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
368 G_IO_IN,
369 nbd_accept,
370 NULL, NULL);
371 }
372 } else {
373 if (server_watch != -1) {
374 g_source_remove(server_watch);
375 server_watch = -1;
376 }
377 }
378 }
379
380
381 static SocketAddress *nbd_build_socket_address(const char *sockpath,
382 const char *bindto,
383 const char *port)
384 {
385 SocketAddress *saddr;
386
387 saddr = g_new0(SocketAddress, 1);
388 if (sockpath) {
389 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
390 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
391 saddr->u.q_unix.data->path = g_strdup(sockpath);
392 } else {
393 InetSocketAddress *inet;
394 saddr->type = SOCKET_ADDRESS_KIND_INET;
395 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
396 inet->host = g_strdup(bindto);
397 if (port) {
398 inet->port = g_strdup(port);
399 } else {
400 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
401 }
402 }
403
404 return saddr;
405 }
406
407
408 static QemuOptsList file_opts = {
409 .name = "file",
410 .implied_opt_name = "file",
411 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
412 .desc = {
413 /* no elements => accept any params */
414 { /* end of list */ }
415 },
416 };
417
418 static QemuOptsList qemu_object_opts = {
419 .name = "object",
420 .implied_opt_name = "qom-type",
421 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
422 .desc = {
423 { }
424 },
425 };
426
427
428
429 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
430 {
431 Object *obj;
432 QCryptoTLSCreds *creds;
433
434 obj = object_resolve_path_component(
435 object_get_objects_root(), id);
436 if (!obj) {
437 error_setg(errp, "No TLS credentials with id '%s'",
438 id);
439 return NULL;
440 }
441 creds = (QCryptoTLSCreds *)
442 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
443 if (!creds) {
444 error_setg(errp, "Object with id '%s' is not TLS credentials",
445 id);
446 return NULL;
447 }
448
449 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
450 error_setg(errp,
451 "Expecting TLS credentials with a server endpoint");
452 return NULL;
453 }
454 object_ref(obj);
455 return creds;
456 }
457
458
459 int main(int argc, char **argv)
460 {
461 BlockBackend *blk;
462 BlockDriverState *bs;
463 off_t dev_offset = 0;
464 uint32_t nbdflags = 0;
465 bool disconnect = false;
466 const char *bindto = "0.0.0.0";
467 const char *port = NULL;
468 char *sockpath = NULL;
469 char *device = NULL;
470 off_t fd_size;
471 QemuOpts *sn_opts = NULL;
472 const char *sn_id_or_name = NULL;
473 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:";
474 struct option lopt[] = {
475 { "help", no_argument, NULL, 'h' },
476 { "version", no_argument, NULL, 'V' },
477 { "bind", required_argument, NULL, 'b' },
478 { "port", required_argument, NULL, 'p' },
479 { "socket", required_argument, NULL, 'k' },
480 { "offset", required_argument, NULL, 'o' },
481 { "read-only", no_argument, NULL, 'r' },
482 { "partition", required_argument, NULL, 'P' },
483 { "connect", required_argument, NULL, 'c' },
484 { "disconnect", no_argument, NULL, 'd' },
485 { "snapshot", no_argument, NULL, 's' },
486 { "load-snapshot", required_argument, NULL, 'l' },
487 { "nocache", no_argument, NULL, 'n' },
488 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
489 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
490 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
491 { "detect-zeroes", required_argument, NULL,
492 QEMU_NBD_OPT_DETECT_ZEROES },
493 { "shared", required_argument, NULL, 'e' },
494 { "format", required_argument, NULL, 'f' },
495 { "persistent", no_argument, NULL, 't' },
496 { "verbose", no_argument, NULL, 'v' },
497 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
498 { "export-name", required_argument, NULL, 'x' },
499 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
500 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
501 { NULL, 0, NULL, 0 }
502 };
503 int ch;
504 int opt_ind = 0;
505 char *end;
506 int flags = BDRV_O_RDWR;
507 int partition = -1;
508 int ret = 0;
509 bool seen_cache = false;
510 bool seen_discard = false;
511 bool seen_aio = false;
512 pthread_t client_thread;
513 const char *fmt = NULL;
514 Error *local_err = NULL;
515 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
516 QDict *options = NULL;
517 const char *export_name = NULL;
518 const char *tlscredsid = NULL;
519 bool imageOpts = false;
520 bool writethrough = true;
521
522 /* The client thread uses SIGTERM to interrupt the server. A signal
523 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
524 */
525 struct sigaction sa_sigterm;
526 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
527 sa_sigterm.sa_handler = termsig_handler;
528 sigaction(SIGTERM, &sa_sigterm, NULL);
529
530 qcrypto_init(&error_fatal);
531
532 module_call_init(MODULE_INIT_QOM);
533 qemu_add_opts(&qemu_object_opts);
534 qemu_init_exec_dir(argv[0]);
535
536 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
537 switch (ch) {
538 case 's':
539 flags |= BDRV_O_SNAPSHOT;
540 break;
541 case 'n':
542 optarg = (char *) "none";
543 /* fallthrough */
544 case QEMU_NBD_OPT_CACHE:
545 if (seen_cache) {
546 error_report("-n and --cache can only be specified once");
547 exit(EXIT_FAILURE);
548 }
549 seen_cache = true;
550 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
551 error_report("Invalid cache mode `%s'", optarg);
552 exit(EXIT_FAILURE);
553 }
554 break;
555 case QEMU_NBD_OPT_AIO:
556 if (seen_aio) {
557 error_report("--aio can only be specified once");
558 exit(EXIT_FAILURE);
559 }
560 seen_aio = true;
561 if (!strcmp(optarg, "native")) {
562 flags |= BDRV_O_NATIVE_AIO;
563 } else if (!strcmp(optarg, "threads")) {
564 /* this is the default */
565 } else {
566 error_report("invalid aio mode `%s'", optarg);
567 exit(EXIT_FAILURE);
568 }
569 break;
570 case QEMU_NBD_OPT_DISCARD:
571 if (seen_discard) {
572 error_report("--discard can only be specified once");
573 exit(EXIT_FAILURE);
574 }
575 seen_discard = true;
576 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
577 error_report("Invalid discard mode `%s'", optarg);
578 exit(EXIT_FAILURE);
579 }
580 break;
581 case QEMU_NBD_OPT_DETECT_ZEROES:
582 detect_zeroes =
583 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
584 optarg,
585 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
586 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
587 &local_err);
588 if (local_err) {
589 error_reportf_err(local_err,
590 "Failed to parse detect_zeroes mode: ");
591 exit(EXIT_FAILURE);
592 }
593 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
594 !(flags & BDRV_O_UNMAP)) {
595 error_report("setting detect-zeroes to unmap is not allowed "
596 "without setting discard operation to unmap");
597 exit(EXIT_FAILURE);
598 }
599 break;
600 case 'b':
601 bindto = optarg;
602 break;
603 case 'p':
604 port = optarg;
605 break;
606 case 'o':
607 dev_offset = strtoll (optarg, &end, 0);
608 if (*end) {
609 error_report("Invalid offset `%s'", optarg);
610 exit(EXIT_FAILURE);
611 }
612 if (dev_offset < 0) {
613 error_report("Offset must be positive `%s'", optarg);
614 exit(EXIT_FAILURE);
615 }
616 break;
617 case 'l':
618 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
619 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
620 optarg, false);
621 if (!sn_opts) {
622 error_report("Failed in parsing snapshot param `%s'",
623 optarg);
624 exit(EXIT_FAILURE);
625 }
626 } else {
627 sn_id_or_name = optarg;
628 }
629 /* fall through */
630 case 'r':
631 nbdflags |= NBD_FLAG_READ_ONLY;
632 flags &= ~BDRV_O_RDWR;
633 break;
634 case 'P':
635 partition = strtol(optarg, &end, 0);
636 if (*end) {
637 error_report("Invalid partition `%s'", optarg);
638 exit(EXIT_FAILURE);
639 }
640 if (partition < 1 || partition > 8) {
641 error_report("Invalid partition %d", partition);
642 exit(EXIT_FAILURE);
643 }
644 break;
645 case 'k':
646 sockpath = optarg;
647 if (sockpath[0] != '/') {
648 error_report("socket path must be absolute");
649 exit(EXIT_FAILURE);
650 }
651 break;
652 case 'd':
653 disconnect = true;
654 break;
655 case 'c':
656 device = optarg;
657 break;
658 case 'e':
659 shared = strtol(optarg, &end, 0);
660 if (*end) {
661 error_report("Invalid shared device number '%s'", optarg);
662 exit(EXIT_FAILURE);
663 }
664 if (shared < 1) {
665 error_report("Shared device number must be greater than 0");
666 exit(EXIT_FAILURE);
667 }
668 break;
669 case 'f':
670 fmt = optarg;
671 break;
672 case 't':
673 persistent = 1;
674 break;
675 case 'x':
676 export_name = optarg;
677 break;
678 case 'v':
679 verbose = 1;
680 break;
681 case 'V':
682 version(argv[0]);
683 exit(0);
684 break;
685 case 'h':
686 usage(argv[0]);
687 exit(0);
688 break;
689 case '?':
690 error_report("Try `%s --help' for more information.", argv[0]);
691 exit(EXIT_FAILURE);
692 case QEMU_NBD_OPT_OBJECT: {
693 QemuOpts *opts;
694 opts = qemu_opts_parse_noisily(&qemu_object_opts,
695 optarg, true);
696 if (!opts) {
697 exit(EXIT_FAILURE);
698 }
699 } break;
700 case QEMU_NBD_OPT_TLSCREDS:
701 tlscredsid = optarg;
702 break;
703 case QEMU_NBD_OPT_IMAGE_OPTS:
704 imageOpts = true;
705 break;
706 }
707 }
708
709 if ((argc - optind) != 1) {
710 error_report("Invalid number of arguments");
711 error_printf("Try `%s --help' for more information.\n", argv[0]);
712 exit(EXIT_FAILURE);
713 }
714
715 if (qemu_opts_foreach(&qemu_object_opts,
716 user_creatable_add_opts_foreach,
717 NULL, NULL)) {
718 exit(EXIT_FAILURE);
719 }
720
721 if (tlscredsid) {
722 if (sockpath) {
723 error_report("TLS is only supported with IPv4/IPv6");
724 exit(EXIT_FAILURE);
725 }
726 if (device) {
727 error_report("TLS is not supported with a host device");
728 exit(EXIT_FAILURE);
729 }
730 if (!export_name) {
731 /* Set the default NBD protocol export name, since
732 * we *must* use new style protocol for TLS */
733 export_name = "";
734 }
735 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
736 if (local_err) {
737 error_report("Failed to get TLS creds %s",
738 error_get_pretty(local_err));
739 exit(EXIT_FAILURE);
740 }
741 }
742
743 if (disconnect) {
744 int nbdfd = open(argv[optind], O_RDWR);
745 if (nbdfd < 0) {
746 error_report("Cannot open %s: %s", argv[optind],
747 strerror(errno));
748 exit(EXIT_FAILURE);
749 }
750 nbd_disconnect(nbdfd);
751
752 close(nbdfd);
753
754 printf("%s disconnected\n", argv[optind]);
755
756 return 0;
757 }
758
759 if (device && !verbose) {
760 int stderr_fd[2];
761 pid_t pid;
762 int ret;
763
764 if (qemu_pipe(stderr_fd) < 0) {
765 error_report("Error setting up communication pipe: %s",
766 strerror(errno));
767 exit(EXIT_FAILURE);
768 }
769
770 /* Now daemonize, but keep a communication channel open to
771 * print errors and exit with the proper status code.
772 */
773 pid = fork();
774 if (pid < 0) {
775 error_report("Failed to fork: %s", strerror(errno));
776 exit(EXIT_FAILURE);
777 } else if (pid == 0) {
778 close(stderr_fd[0]);
779 ret = qemu_daemon(1, 0);
780
781 /* Temporarily redirect stderr to the parent's pipe... */
782 dup2(stderr_fd[1], STDERR_FILENO);
783 if (ret < 0) {
784 error_report("Failed to daemonize: %s", strerror(errno));
785 exit(EXIT_FAILURE);
786 }
787
788 /* ... close the descriptor we inherited and go on. */
789 close(stderr_fd[1]);
790 } else {
791 bool errors = false;
792 char *buf;
793
794 /* In the parent. Print error messages from the child until
795 * it closes the pipe.
796 */
797 close(stderr_fd[1]);
798 buf = g_malloc(1024);
799 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
800 errors = true;
801 ret = qemu_write_full(STDERR_FILENO, buf, ret);
802 if (ret < 0) {
803 exit(EXIT_FAILURE);
804 }
805 }
806 if (ret < 0) {
807 error_report("Cannot read from daemon: %s",
808 strerror(errno));
809 exit(EXIT_FAILURE);
810 }
811
812 /* Usually the daemon should not print any message.
813 * Exit with zero status in that case.
814 */
815 exit(errors);
816 }
817 }
818
819 if (device != NULL && sockpath == NULL) {
820 sockpath = g_malloc(128);
821 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
822 }
823
824 saddr = nbd_build_socket_address(sockpath, bindto, port);
825
826 if (qemu_init_main_loop(&local_err)) {
827 error_report_err(local_err);
828 exit(EXIT_FAILURE);
829 }
830 bdrv_init();
831 atexit(bdrv_close_all);
832
833 srcpath = argv[optind];
834 if (imageOpts) {
835 QemuOpts *opts;
836 if (fmt) {
837 error_report("--image-opts and -f are mutually exclusive");
838 exit(EXIT_FAILURE);
839 }
840 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
841 if (!opts) {
842 qemu_opts_reset(&file_opts);
843 exit(EXIT_FAILURE);
844 }
845 options = qemu_opts_to_qdict(opts, NULL);
846 qemu_opts_reset(&file_opts);
847 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
848 } else {
849 if (fmt) {
850 options = qdict_new();
851 qdict_put(options, "driver", qstring_from_str(fmt));
852 }
853 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
854 }
855
856 if (!blk) {
857 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
858 argv[optind]);
859 exit(EXIT_FAILURE);
860 }
861 bs = blk_bs(blk);
862
863 blk_set_enable_write_cache(blk, !writethrough);
864
865 if (sn_opts) {
866 ret = bdrv_snapshot_load_tmp(bs,
867 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
868 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
869 &local_err);
870 } else if (sn_id_or_name) {
871 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
872 &local_err);
873 }
874 if (ret < 0) {
875 error_reportf_err(local_err, "Failed to load snapshot: ");
876 exit(EXIT_FAILURE);
877 }
878
879 bs->detect_zeroes = detect_zeroes;
880 fd_size = blk_getlength(blk);
881 if (fd_size < 0) {
882 error_report("Failed to determine the image length: %s",
883 strerror(-fd_size));
884 exit(EXIT_FAILURE);
885 }
886
887 if (partition != -1) {
888 ret = find_partition(blk, partition, &dev_offset, &fd_size);
889 if (ret < 0) {
890 error_report("Could not find partition %d: %s", partition,
891 strerror(-ret));
892 exit(EXIT_FAILURE);
893 }
894 }
895
896 exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed,
897 &local_err);
898 if (!exp) {
899 error_report_err(local_err);
900 exit(EXIT_FAILURE);
901 }
902 if (export_name) {
903 nbd_export_set_name(exp, export_name);
904 newproto = true;
905 }
906
907 server_ioc = qio_channel_socket_new();
908 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
909 object_unref(OBJECT(server_ioc));
910 error_report_err(local_err);
911 return 1;
912 }
913
914 if (device) {
915 int ret;
916
917 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
918 if (ret != 0) {
919 error_report("Failed to create client thread: %s", strerror(ret));
920 exit(EXIT_FAILURE);
921 }
922 } else {
923 /* Shut up GCC warnings. */
924 memset(&client_thread, 0, sizeof(client_thread));
925 }
926
927 nbd_update_server_watch();
928
929 /* now when the initialization is (almost) complete, chdir("/")
930 * to free any busy filesystems */
931 if (chdir("/") < 0) {
932 error_report("Could not chdir to root directory: %s",
933 strerror(errno));
934 exit(EXIT_FAILURE);
935 }
936
937 state = RUNNING;
938 do {
939 main_loop_wait(false);
940 if (state == TERMINATE) {
941 state = TERMINATING;
942 nbd_export_close(exp);
943 nbd_export_put(exp);
944 exp = NULL;
945 }
946 } while (state != TERMINATED);
947
948 blk_unref(blk);
949 if (sockpath) {
950 unlink(sockpath);
951 }
952
953 qemu_opts_del(sn_opts);
954
955 if (device) {
956 void *ret;
957 pthread_join(client_thread, &ret);
958 exit(ret != NULL);
959 } else {
960 exit(EXIT_SUCCESS);
961 }
962 }