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 "qapi/error.h"
25#include "qemu-common.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/error-report.h"
32#include "qemu/config-file.h"
33#include "qemu/bswap.h"
34#include "qemu/log.h"
35#include "qemu/systemd.h"
36#include "block/snapshot.h"
37#include "qapi/qmp/qstring.h"
38#include "qom/object_interfaces.h"
39#include "io/channel-socket.h"
40#include "crypto/init.h"
41#include "trace/control.h"
42#include "qemu-version.h"
43
44#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
45#define QEMU_NBD_OPT_CACHE 256
46#define QEMU_NBD_OPT_AIO 257
47#define QEMU_NBD_OPT_DISCARD 258
48#define QEMU_NBD_OPT_DETECT_ZEROES 259
49#define QEMU_NBD_OPT_OBJECT 260
50#define QEMU_NBD_OPT_TLSCREDS 261
51#define QEMU_NBD_OPT_IMAGE_OPTS 262
52#define QEMU_NBD_OPT_FORK 263
53
54#define MBR_SIZE 512
55
56static NBDExport *exp;
57static bool newproto;
58static int verbose;
59static char *srcpath;
60static SocketAddress *saddr;
61static int persistent = 0;
62static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
63static int shared = 1;
64static int nb_fds;
65static QIOChannelSocket *server_ioc;
66static int server_watch = -1;
67static QCryptoTLSCreds *tlscreds;
68
69static void usage(const char *name)
70{
71 (printf) (
72"Usage: %s [OPTIONS] FILE\n"
73"QEMU Disk Network Block Device Server\n"
74"\n"
75" -h, --help display this help and exit\n"
76" -V, --version output version information and exit\n"
77"\n"
78"Connection properties:\n"
79" -p, --port=PORT port to listen on (default `%d')\n"
80" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
81" -k, --socket=PATH path to the unix socket\n"
82" (default '"SOCKET_PATH"')\n"
83" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
84" -t, --persistent don't exit on the last connection\n"
85" -v, --verbose display extra debugging information\n"
86" -x, --export-name=NAME expose export by name\n"
87" -D, --description=TEXT with -x, also export a human-readable description\n"
88"\n"
89"Exposing part of the image:\n"
90" -o, --offset=OFFSET offset into the image\n"
91" -P, --partition=NUM only expose partition NUM\n"
92"\n"
93"General purpose options:\n"
94" --object type,id=ID,... define an object such as 'secret' for providing\n"
95" passwords and/or encryption keys\n"
96" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
97" specify tracing options\n"
98" --fork fork off the server process and exit the parent\n"
99" once the server is running\n"
100#ifdef __linux__
101"Kernel NBD client support:\n"
102" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
103" -d, --disconnect disconnect the specified device\n"
104"\n"
105#endif
106"\n"
107"Block device options:\n"
108" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
109" -r, --read-only export read-only\n"
110" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
111" file with backing_file=FILE, redirect the write to\n"
112" the temporary one\n"
113" -l, --load-snapshot=SNAPSHOT_PARAM\n"
114" load an internal snapshot inside FILE and export it\n"
115" as an read-only device, SNAPSHOT_PARAM format is\n"
116" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
117" '[ID_OR_NAME]'\n"
118" -n, --nocache disable host cache\n"
119" --cache=MODE set cache mode (none, writeback, ...)\n"
120" --aio=MODE set AIO mode (native or threads)\n"
121" --discard=MODE set discard mode (ignore, unmap)\n"
122" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
123" --image-opts treat FILE as a full set of image options\n"
124"\n"
125QEMU_HELP_BOTTOM "\n"
126 , name, NBD_DEFAULT_PORT, "DEVICE");
127}
128
129static void version(const char *name)
130{
131 printf(
132"%s " QEMU_VERSION QEMU_PKGVERSION "\n"
133"Written by Anthony Liguori.\n"
134"\n"
135QEMU_COPYRIGHT "\n"
136"This is free software; see the source for copying conditions. There is NO\n"
137"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
138 , name);
139}
140
141struct partition_record
142{
143 uint8_t bootable;
144 uint8_t start_head;
145 uint32_t start_cylinder;
146 uint8_t start_sector;
147 uint8_t system;
148 uint8_t end_head;
149 uint8_t end_cylinder;
150 uint8_t end_sector;
151 uint32_t start_sector_abs;
152 uint32_t nb_sectors_abs;
153};
154
155static void read_partition(uint8_t *p, struct partition_record *r)
156{
157 r->bootable = p[0];
158 r->start_head = p[1];
159 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
160 r->start_sector = p[2] & 0x3f;
161 r->system = p[4];
162 r->end_head = p[5];
163 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
164 r->end_sector = p[6] & 0x3f;
165
166 r->start_sector_abs = ldl_le_p(p + 8);
167 r->nb_sectors_abs = ldl_le_p(p + 12);
168}
169
170static int find_partition(BlockBackend *blk, int partition,
171 off_t *offset, off_t *size)
172{
173 struct partition_record mbr[4];
174 uint8_t data[MBR_SIZE];
175 int i;
176 int ext_partnum = 4;
177 int ret;
178
179 ret = blk_pread(blk, 0, data, sizeof(data));
180 if (ret < 0) {
181 error_report("error while reading: %s", strerror(-ret));
182 exit(EXIT_FAILURE);
183 }
184
185 if (data[510] != 0x55 || data[511] != 0xaa) {
186 return -EINVAL;
187 }
188
189 for (i = 0; i < 4; i++) {
190 read_partition(&data[446 + 16 * i], &mbr[i]);
191
192 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
193 continue;
194 }
195
196 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
197 struct partition_record ext[4];
198 uint8_t data1[MBR_SIZE];
199 int j;
200
201 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
202 data1, sizeof(data1));
203 if (ret < 0) {
204 error_report("error while reading: %s", strerror(-ret));
205 exit(EXIT_FAILURE);
206 }
207
208 for (j = 0; j < 4; j++) {
209 read_partition(&data1[446 + 16 * j], &ext[j]);
210 if (!ext[j].system || !ext[j].nb_sectors_abs) {
211 continue;
212 }
213
214 if ((ext_partnum + j + 1) == partition) {
215 *offset = (uint64_t)ext[j].start_sector_abs << 9;
216 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
217 return 0;
218 }
219 }
220 ext_partnum += 4;
221 } else if ((i + 1) == partition) {
222 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
223 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
224 return 0;
225 }
226 }
227
228 return -ENOENT;
229}
230
231static void termsig_handler(int signum)
232{
233 atomic_cmpxchg(&state, RUNNING, TERMINATE);
234 qemu_notify_event();
235}
236
237
238static void *show_parts(void *arg)
239{
240 char *device = arg;
241 int nbd;
242
243
244
245
246
247
248 nbd = open(device, O_RDWR);
249 if (nbd >= 0) {
250 close(nbd);
251 }
252 return NULL;
253}
254
255static void *nbd_client_thread(void *arg)
256{
257 char *device = arg;
258 NBDExportInfo info = { .request_sizes = false, };
259 QIOChannelSocket *sioc;
260 int fd;
261 int ret;
262 pthread_t show_parts_thread;
263 Error *local_error = NULL;
264
265 sioc = qio_channel_socket_new();
266 if (qio_channel_socket_connect_sync(sioc,
267 saddr,
268 &local_error) < 0) {
269 error_report_err(local_error);
270 goto out;
271 }
272
273 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL,
274 NULL, NULL, NULL, &info, &local_error);
275 if (ret < 0) {
276 if (local_error) {
277 error_report_err(local_error);
278 }
279 goto out_socket;
280 }
281
282 fd = open(device, O_RDWR);
283 if (fd < 0) {
284
285 error_report("Failed to open %s: %m", device);
286 goto out_socket;
287 }
288
289 ret = nbd_init(fd, sioc, &info, &local_error);
290 if (ret < 0) {
291 error_report_err(local_error);
292 goto out_fd;
293 }
294
295
296 pthread_create(&show_parts_thread, NULL, show_parts, device);
297
298 if (verbose) {
299 fprintf(stderr, "NBD device %s is now connected to %s\n",
300 device, srcpath);
301 } else {
302
303 dup2(STDOUT_FILENO, STDERR_FILENO);
304 }
305
306 ret = nbd_client(fd);
307 if (ret) {
308 goto out_fd;
309 }
310 close(fd);
311 object_unref(OBJECT(sioc));
312 kill(getpid(), SIGTERM);
313 return (void *) EXIT_SUCCESS;
314
315out_fd:
316 close(fd);
317out_socket:
318 object_unref(OBJECT(sioc));
319out:
320 kill(getpid(), SIGTERM);
321 return (void *) EXIT_FAILURE;
322}
323
324static int nbd_can_accept(void)
325{
326 return state == RUNNING && nb_fds < shared;
327}
328
329static void nbd_export_closed(NBDExport *exp)
330{
331 assert(state == TERMINATING);
332 state = TERMINATED;
333}
334
335static void nbd_update_server_watch(void);
336
337static 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
347static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
348{
349 QIOChannelSocket *cioc;
350
351 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
352 NULL);
353 if (!cioc) {
354 return TRUE;
355 }
356
357 if (state >= TERMINATE) {
358 object_unref(OBJECT(cioc));
359 return TRUE;
360 }
361
362 nb_fds++;
363 nbd_update_server_watch();
364 nbd_client_new(newproto ? NULL : exp, cioc,
365 tlscreds, NULL, nbd_client_closed);
366 object_unref(OBJECT(cioc));
367
368 return TRUE;
369}
370
371static void nbd_update_server_watch(void)
372{
373 if (nbd_can_accept()) {
374 if (server_watch == -1) {
375 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
376 G_IO_IN,
377 nbd_accept,
378 NULL, NULL);
379 }
380 } else {
381 if (server_watch != -1) {
382 g_source_remove(server_watch);
383 server_watch = -1;
384 }
385 }
386}
387
388
389static SocketAddress *nbd_build_socket_address(const char *sockpath,
390 const char *bindto,
391 const char *port)
392{
393 SocketAddress *saddr;
394
395 saddr = g_new0(SocketAddress, 1);
396 if (sockpath) {
397 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
398 saddr->u.q_unix.path = g_strdup(sockpath);
399 } else {
400 InetSocketAddress *inet;
401 saddr->type = SOCKET_ADDRESS_TYPE_INET;
402 inet = &saddr->u.inet;
403 inet->host = g_strdup(bindto);
404 if (port) {
405 inet->port = g_strdup(port);
406 } else {
407 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
408 }
409 }
410
411 return saddr;
412}
413
414
415static QemuOptsList file_opts = {
416 .name = "file",
417 .implied_opt_name = "file",
418 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
419 .desc = {
420
421 { }
422 },
423};
424
425static QemuOptsList qemu_object_opts = {
426 .name = "object",
427 .implied_opt_name = "qom-type",
428 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
429 .desc = {
430 { }
431 },
432};
433
434
435
436static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
437{
438 Object *obj;
439 QCryptoTLSCreds *creds;
440
441 obj = object_resolve_path_component(
442 object_get_objects_root(), id);
443 if (!obj) {
444 error_setg(errp, "No TLS credentials with id '%s'",
445 id);
446 return NULL;
447 }
448 creds = (QCryptoTLSCreds *)
449 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
450 if (!creds) {
451 error_setg(errp, "Object with id '%s' is not TLS credentials",
452 id);
453 return NULL;
454 }
455
456 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
457 error_setg(errp,
458 "Expecting TLS credentials with a server endpoint");
459 return NULL;
460 }
461 object_ref(obj);
462 return creds;
463}
464
465static void setup_address_and_port(const char **address, const char **port)
466{
467 if (*address == NULL) {
468 *address = "0.0.0.0";
469 }
470
471 if (*port == NULL) {
472 *port = stringify(NBD_DEFAULT_PORT);
473 }
474}
475
476
477
478
479static const char *socket_activation_validate_opts(const char *device,
480 const char *sockpath,
481 const char *address,
482 const char *port)
483{
484 if (device != NULL) {
485 return "NBD device can't be set when using socket activation";
486 }
487
488 if (sockpath != NULL) {
489 return "Unix socket can't be set when using socket activation";
490 }
491
492 if (address != NULL) {
493 return "The interface can't be set when using socket activation";
494 }
495
496 if (port != NULL) {
497 return "TCP port number can't be set when using socket activation";
498 }
499
500 return NULL;
501}
502
503int main(int argc, char **argv)
504{
505 BlockBackend *blk;
506 BlockDriverState *bs;
507 off_t dev_offset = 0;
508 uint16_t nbdflags = 0;
509 bool disconnect = false;
510 const char *bindto = NULL;
511 const char *port = NULL;
512 char *sockpath = NULL;
513 char *device = NULL;
514 off_t fd_size;
515 QemuOpts *sn_opts = NULL;
516 const char *sn_id_or_name = NULL;
517 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
518 struct option lopt[] = {
519 { "help", no_argument, NULL, 'h' },
520 { "version", no_argument, NULL, 'V' },
521 { "bind", required_argument, NULL, 'b' },
522 { "port", required_argument, NULL, 'p' },
523 { "socket", required_argument, NULL, 'k' },
524 { "offset", required_argument, NULL, 'o' },
525 { "read-only", no_argument, NULL, 'r' },
526 { "partition", required_argument, NULL, 'P' },
527 { "connect", required_argument, NULL, 'c' },
528 { "disconnect", no_argument, NULL, 'd' },
529 { "snapshot", no_argument, NULL, 's' },
530 { "load-snapshot", required_argument, NULL, 'l' },
531 { "nocache", no_argument, NULL, 'n' },
532 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
533 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
534 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
535 { "detect-zeroes", required_argument, NULL,
536 QEMU_NBD_OPT_DETECT_ZEROES },
537 { "shared", required_argument, NULL, 'e' },
538 { "format", required_argument, NULL, 'f' },
539 { "persistent", no_argument, NULL, 't' },
540 { "verbose", no_argument, NULL, 'v' },
541 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
542 { "export-name", required_argument, NULL, 'x' },
543 { "description", required_argument, NULL, 'D' },
544 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
545 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
546 { "trace", required_argument, NULL, 'T' },
547 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
548 { NULL, 0, NULL, 0 }
549 };
550 int ch;
551 int opt_ind = 0;
552 char *end;
553 int flags = BDRV_O_RDWR;
554 int partition = -1;
555 int ret = 0;
556 bool seen_cache = false;
557 bool seen_discard = false;
558 bool seen_aio = false;
559 pthread_t client_thread;
560 const char *fmt = NULL;
561 Error *local_err = NULL;
562 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
563 QDict *options = NULL;
564 const char *export_name = NULL;
565 const char *export_description = NULL;
566 const char *tlscredsid = NULL;
567 bool imageOpts = false;
568 bool writethrough = true;
569 char *trace_file = NULL;
570 bool fork_process = false;
571 int old_stderr = -1;
572 unsigned socket_activation;
573
574
575
576
577 struct sigaction sa_sigterm;
578 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
579 sa_sigterm.sa_handler = termsig_handler;
580 sigaction(SIGTERM, &sa_sigterm, NULL);
581
582#ifdef CONFIG_POSIX
583 signal(SIGPIPE, SIG_IGN);
584#endif
585
586 module_call_init(MODULE_INIT_TRACE);
587 qcrypto_init(&error_fatal);
588
589 module_call_init(MODULE_INIT_QOM);
590 qemu_add_opts(&qemu_object_opts);
591 qemu_add_opts(&qemu_trace_opts);
592 qemu_init_exec_dir(argv[0]);
593
594 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
595 switch (ch) {
596 case 's':
597 flags |= BDRV_O_SNAPSHOT;
598 break;
599 case 'n':
600 optarg = (char *) "none";
601
602 case QEMU_NBD_OPT_CACHE:
603 if (seen_cache) {
604 error_report("-n and --cache can only be specified once");
605 exit(EXIT_FAILURE);
606 }
607 seen_cache = true;
608 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
609 error_report("Invalid cache mode `%s'", optarg);
610 exit(EXIT_FAILURE);
611 }
612 break;
613 case QEMU_NBD_OPT_AIO:
614 if (seen_aio) {
615 error_report("--aio can only be specified once");
616 exit(EXIT_FAILURE);
617 }
618 seen_aio = true;
619 if (!strcmp(optarg, "native")) {
620 flags |= BDRV_O_NATIVE_AIO;
621 } else if (!strcmp(optarg, "threads")) {
622
623 } else {
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 dev_offset = strtoll (optarg, &end, 0);
665 if (*end) {
666 error_report("Invalid offset `%s'", optarg);
667 exit(EXIT_FAILURE);
668 }
669 if (dev_offset < 0) {
670 error_report("Offset must be positive `%s'", optarg);
671 exit(EXIT_FAILURE);
672 }
673 break;
674 case 'l':
675 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
676 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
677 optarg, false);
678 if (!sn_opts) {
679 error_report("Failed in parsing snapshot param `%s'",
680 optarg);
681 exit(EXIT_FAILURE);
682 }
683 } else {
684 sn_id_or_name = optarg;
685 }
686
687 case 'r':
688 nbdflags |= NBD_FLAG_READ_ONLY;
689 flags &= ~BDRV_O_RDWR;
690 break;
691 case 'P':
692 partition = strtol(optarg, &end, 0);
693 if (*end) {
694 error_report("Invalid partition `%s'", optarg);
695 exit(EXIT_FAILURE);
696 }
697 if (partition < 1 || partition > 8) {
698 error_report("Invalid partition %d", partition);
699 exit(EXIT_FAILURE);
700 }
701 break;
702 case 'k':
703 sockpath = optarg;
704 if (sockpath[0] != '/') {
705 error_report("socket path must be absolute");
706 exit(EXIT_FAILURE);
707 }
708 break;
709 case 'd':
710 disconnect = true;
711 break;
712 case 'c':
713 device = optarg;
714 break;
715 case 'e':
716 shared = strtol(optarg, &end, 0);
717 if (*end) {
718 error_report("Invalid shared device number '%s'", optarg);
719 exit(EXIT_FAILURE);
720 }
721 if (shared < 1) {
722 error_report("Shared device number must be greater than 0");
723 exit(EXIT_FAILURE);
724 }
725 break;
726 case 'f':
727 fmt = optarg;
728 break;
729 case 't':
730 persistent = 1;
731 break;
732 case 'x':
733 export_name = optarg;
734 break;
735 case 'D':
736 export_description = optarg;
737 break;
738 case 'v':
739 verbose = 1;
740 break;
741 case 'V':
742 version(argv[0]);
743 exit(0);
744 break;
745 case 'h':
746 usage(argv[0]);
747 exit(0);
748 break;
749 case '?':
750 error_report("Try `%s --help' for more information.", argv[0]);
751 exit(EXIT_FAILURE);
752 case QEMU_NBD_OPT_OBJECT: {
753 QemuOpts *opts;
754 opts = qemu_opts_parse_noisily(&qemu_object_opts,
755 optarg, true);
756 if (!opts) {
757 exit(EXIT_FAILURE);
758 }
759 } break;
760 case QEMU_NBD_OPT_TLSCREDS:
761 tlscredsid = optarg;
762 break;
763 case QEMU_NBD_OPT_IMAGE_OPTS:
764 imageOpts = true;
765 break;
766 case 'T':
767 g_free(trace_file);
768 trace_file = trace_opt_parse(optarg);
769 break;
770 case QEMU_NBD_OPT_FORK:
771 fork_process = true;
772 break;
773 }
774 }
775
776 if ((argc - optind) != 1) {
777 error_report("Invalid number of arguments");
778 error_printf("Try `%s --help' for more information.\n", argv[0]);
779 exit(EXIT_FAILURE);
780 }
781
782 if (qemu_opts_foreach(&qemu_object_opts,
783 user_creatable_add_opts_foreach,
784 NULL, NULL)) {
785 exit(EXIT_FAILURE);
786 }
787
788 if (!trace_init_backends()) {
789 exit(1);
790 }
791 trace_init_file(trace_file);
792 qemu_set_log(LOG_TRACE);
793
794 socket_activation = check_socket_activation();
795 if (socket_activation == 0) {
796 setup_address_and_port(&bindto, &port);
797 } else {
798
799 const char *err_msg = socket_activation_validate_opts(device, sockpath,
800 bindto, port);
801 if (err_msg != NULL) {
802 error_report("%s", err_msg);
803 exit(EXIT_FAILURE);
804 }
805
806
807 if (socket_activation > 1) {
808 error_report("qemu-nbd does not support socket activation with %s > 1",
809 "LISTEN_FDS");
810 exit(EXIT_FAILURE);
811 }
812 }
813
814 if (tlscredsid) {
815 if (sockpath) {
816 error_report("TLS is only supported with IPv4/IPv6");
817 exit(EXIT_FAILURE);
818 }
819 if (device) {
820 error_report("TLS is not supported with a host device");
821 exit(EXIT_FAILURE);
822 }
823 if (!export_name) {
824
825
826 export_name = "";
827 }
828 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
829 if (local_err) {
830 error_report("Failed to get TLS creds %s",
831 error_get_pretty(local_err));
832 exit(EXIT_FAILURE);
833 }
834 }
835
836 if (disconnect) {
837 int nbdfd = open(argv[optind], O_RDWR);
838 if (nbdfd < 0) {
839 error_report("Cannot open %s: %s", argv[optind],
840 strerror(errno));
841 exit(EXIT_FAILURE);
842 }
843 nbd_disconnect(nbdfd);
844
845 close(nbdfd);
846
847 printf("%s disconnected\n", argv[optind]);
848
849 return 0;
850 }
851
852 if ((device && !verbose) || fork_process) {
853 int stderr_fd[2];
854 pid_t pid;
855 int ret;
856
857 if (qemu_pipe(stderr_fd) < 0) {
858 error_report("Error setting up communication pipe: %s",
859 strerror(errno));
860 exit(EXIT_FAILURE);
861 }
862
863
864
865
866 pid = fork();
867 if (pid < 0) {
868 error_report("Failed to fork: %s", strerror(errno));
869 exit(EXIT_FAILURE);
870 } else if (pid == 0) {
871 close(stderr_fd[0]);
872 ret = qemu_daemon(1, 0);
873
874
875 old_stderr = dup(STDERR_FILENO);
876 dup2(stderr_fd[1], STDERR_FILENO);
877 if (ret < 0) {
878 error_report("Failed to daemonize: %s", strerror(errno));
879 exit(EXIT_FAILURE);
880 }
881
882
883 close(stderr_fd[1]);
884 } else {
885 bool errors = false;
886 char *buf;
887
888
889
890
891 close(stderr_fd[1]);
892 buf = g_malloc(1024);
893 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
894 errors = true;
895 ret = qemu_write_full(STDERR_FILENO, buf, ret);
896 if (ret < 0) {
897 exit(EXIT_FAILURE);
898 }
899 }
900 if (ret < 0) {
901 error_report("Cannot read from daemon: %s",
902 strerror(errno));
903 exit(EXIT_FAILURE);
904 }
905
906
907
908
909 exit(errors);
910 }
911 }
912
913 if (device != NULL && sockpath == NULL) {
914 sockpath = g_malloc(128);
915 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
916 }
917
918 if (socket_activation == 0) {
919 server_ioc = qio_channel_socket_new();
920 saddr = nbd_build_socket_address(sockpath, bindto, port);
921 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
922 object_unref(OBJECT(server_ioc));
923 error_report_err(local_err);
924 return 1;
925 }
926 } else {
927
928 assert(socket_activation == 1);
929 server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
930 &local_err);
931 if (server_ioc == NULL) {
932 error_report("Failed to use socket activation: %s",
933 error_get_pretty(local_err));
934 exit(EXIT_FAILURE);
935 }
936 }
937
938 if (qemu_init_main_loop(&local_err)) {
939 error_report_err(local_err);
940 exit(EXIT_FAILURE);
941 }
942 bdrv_init();
943 atexit(bdrv_close_all);
944
945 srcpath = argv[optind];
946 if (imageOpts) {
947 QemuOpts *opts;
948 if (fmt) {
949 error_report("--image-opts and -f are mutually exclusive");
950 exit(EXIT_FAILURE);
951 }
952 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
953 if (!opts) {
954 qemu_opts_reset(&file_opts);
955 exit(EXIT_FAILURE);
956 }
957 options = qemu_opts_to_qdict(opts, NULL);
958 qemu_opts_reset(&file_opts);
959 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
960 } else {
961 if (fmt) {
962 options = qdict_new();
963 qdict_put_str(options, "driver", fmt);
964 }
965 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
966 }
967
968 if (!blk) {
969 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
970 argv[optind]);
971 exit(EXIT_FAILURE);
972 }
973 bs = blk_bs(blk);
974
975 blk_set_enable_write_cache(blk, !writethrough);
976
977 if (sn_opts) {
978 ret = bdrv_snapshot_load_tmp(bs,
979 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
980 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
981 &local_err);
982 } else if (sn_id_or_name) {
983 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
984 &local_err);
985 }
986 if (ret < 0) {
987 error_reportf_err(local_err, "Failed to load snapshot: ");
988 exit(EXIT_FAILURE);
989 }
990
991 bs->detect_zeroes = detect_zeroes;
992 fd_size = blk_getlength(blk);
993 if (fd_size < 0) {
994 error_report("Failed to determine the image length: %s",
995 strerror(-fd_size));
996 exit(EXIT_FAILURE);
997 }
998
999 if (dev_offset >= fd_size) {
1000 error_report("Offset (%lld) has to be smaller than the image size "
1001 "(%lld)",
1002 (long long int)dev_offset, (long long int)fd_size);
1003 exit(EXIT_FAILURE);
1004 }
1005 fd_size -= dev_offset;
1006
1007 if (partition != -1) {
1008 ret = find_partition(blk, partition, &dev_offset, &fd_size);
1009 if (ret < 0) {
1010 error_report("Could not find partition %d: %s", partition,
1011 strerror(-ret));
1012 exit(EXIT_FAILURE);
1013 }
1014 }
1015
1016 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1017 writethrough, NULL, &local_err);
1018 if (!exp) {
1019 error_report_err(local_err);
1020 exit(EXIT_FAILURE);
1021 }
1022 if (export_name) {
1023 nbd_export_set_name(exp, export_name);
1024 nbd_export_set_description(exp, export_description);
1025 newproto = true;
1026 } else if (export_description) {
1027 error_report("Export description requires an export name");
1028 exit(EXIT_FAILURE);
1029 }
1030
1031 if (device) {
1032 int ret;
1033
1034 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1035 if (ret != 0) {
1036 error_report("Failed to create client thread: %s", strerror(ret));
1037 exit(EXIT_FAILURE);
1038 }
1039 } else {
1040
1041 memset(&client_thread, 0, sizeof(client_thread));
1042 }
1043
1044 nbd_update_server_watch();
1045
1046
1047
1048 if (chdir("/") < 0) {
1049 error_report("Could not chdir to root directory: %s",
1050 strerror(errno));
1051 exit(EXIT_FAILURE);
1052 }
1053
1054 if (fork_process) {
1055 dup2(old_stderr, STDERR_FILENO);
1056 close(old_stderr);
1057 }
1058
1059 state = RUNNING;
1060 do {
1061 main_loop_wait(false);
1062 if (state == TERMINATE) {
1063 state = TERMINATING;
1064 nbd_export_close(exp);
1065 nbd_export_put(exp);
1066 exp = NULL;
1067 }
1068 } while (state != TERMINATED);
1069
1070 blk_unref(blk);
1071 if (sockpath) {
1072 unlink(sockpath);
1073 }
1074
1075 qemu_opts_del(sn_opts);
1076
1077 if (device) {
1078 void *ret;
1079 pthread_join(client_thread, &ret);
1080 exit(ret != NULL);
1081 } else {
1082 exit(EXIT_SUCCESS);
1083 }
1084}
1085
