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/cutils.h"
26#include "sysemu/block-backend.h"
27#include "block/block_int.h"
28#include "block/nbd.h"
29#include "qemu/main-loop.h"
30#include "qemu/option.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/qdict.h"
38#include "qapi/qmp/qstring.h"
39#include "qom/object_interfaces.h"
40#include "io/channel-socket.h"
41#include "io/net-listener.h"
42#include "crypto/init.h"
43#include "trace/control.h"
44#include "qemu-version.h"
45
46#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
47#define QEMU_NBD_OPT_CACHE 256
48#define QEMU_NBD_OPT_AIO 257
49#define QEMU_NBD_OPT_DISCARD 258
50#define QEMU_NBD_OPT_DETECT_ZEROES 259
51#define QEMU_NBD_OPT_OBJECT 260
52#define QEMU_NBD_OPT_TLSCREDS 261
53#define QEMU_NBD_OPT_IMAGE_OPTS 262
54#define QEMU_NBD_OPT_FORK 263
55
56#define MBR_SIZE 512
57
58static NBDExport *exp;
59static int verbose;
60static char *srcpath;
61static SocketAddress *saddr;
62static int persistent = 0;
63static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
64static int shared = 1;
65static int nb_fds;
66static QIONetListener *server;
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 (default is empty string)\n"
87" -D, --description=TEXT 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" --tls-creds=ID use id of an earlier --object to provide TLS\n"
97" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
98" specify tracing options\n"
99" --fork fork off the server process and exit the parent\n"
100" once the server is running\n"
101#ifdef __linux__
102"Kernel NBD client support:\n"
103" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
104" -d, --disconnect disconnect the specified device\n"
105"\n"
106#endif
107"\n"
108"Block device options:\n"
109" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
110" -r, --read-only export read-only\n"
111" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
112" file with backing_file=FILE, redirect the write to\n"
113" the temporary one\n"
114" -l, --load-snapshot=SNAPSHOT_PARAM\n"
115" load an internal snapshot inside FILE and export it\n"
116" as an read-only device, SNAPSHOT_PARAM format is\n"
117" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
118" '[ID_OR_NAME]'\n"
119" -n, --nocache disable host cache\n"
120" --cache=MODE set cache mode (none, writeback, ...)\n"
121" --aio=MODE set AIO mode (native or threads)\n"
122" --discard=MODE set discard mode (ignore, unmap)\n"
123" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
124" --image-opts treat FILE as a full set of image options\n"
125"\n"
126QEMU_HELP_BOTTOM "\n"
127 , name, NBD_DEFAULT_PORT, "DEVICE");
128}
129
130static void version(const char *name)
131{
132 printf(
133"%s " QEMU_FULL_VERSION "\n"
134"Written by Anthony Liguori.\n"
135"\n"
136QEMU_COPYRIGHT "\n"
137"This is free software; see the source for copying conditions. There is NO\n"
138"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
139 , name);
140}
141
142struct partition_record
143{
144 uint8_t bootable;
145 uint8_t start_head;
146 uint32_t start_cylinder;
147 uint8_t start_sector;
148 uint8_t system;
149 uint8_t end_head;
150 uint8_t end_cylinder;
151 uint8_t end_sector;
152 uint32_t start_sector_abs;
153 uint32_t nb_sectors_abs;
154};
155
156static void read_partition(uint8_t *p, struct partition_record *r)
157{
158 r->bootable = p[0];
159 r->start_head = p[1];
160 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
161 r->start_sector = p[2] & 0x3f;
162 r->system = p[4];
163 r->end_head = p[5];
164 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
165 r->end_sector = p[6] & 0x3f;
166
167 r->start_sector_abs = ldl_le_p(p + 8);
168 r->nb_sectors_abs = ldl_le_p(p + 12);
169}
170
171static int find_partition(BlockBackend *blk, int partition,
172 off_t *offset, off_t *size)
173{
174 struct partition_record mbr[4];
175 uint8_t data[MBR_SIZE];
176 int i;
177 int ext_partnum = 4;
178 int ret;
179
180 ret = blk_pread(blk, 0, data, sizeof(data));
181 if (ret < 0) {
182 error_report("error while reading: %s", strerror(-ret));
183 exit(EXIT_FAILURE);
184 }
185
186 if (data[510] != 0x55 || data[511] != 0xaa) {
187 return -EINVAL;
188 }
189
190 for (i = 0; i < 4; i++) {
191 read_partition(&data[446 + 16 * i], &mbr[i]);
192
193 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
194 continue;
195 }
196
197 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
198 struct partition_record ext[4];
199 uint8_t data1[MBR_SIZE];
200 int j;
201
202 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
203 data1, sizeof(data1));
204 if (ret < 0) {
205 error_report("error while reading: %s", strerror(-ret));
206 exit(EXIT_FAILURE);
207 }
208
209 for (j = 0; j < 4; j++) {
210 read_partition(&data1[446 + 16 * j], &ext[j]);
211 if (!ext[j].system || !ext[j].nb_sectors_abs) {
212 continue;
213 }
214
215 if ((ext_partnum + j + 1) == partition) {
216 *offset = (uint64_t)ext[j].start_sector_abs << 9;
217 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
218 return 0;
219 }
220 }
221 ext_partnum += 4;
222 } else if ((i + 1) == partition) {
223 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
224 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
225 return 0;
226 }
227 }
228
229 return -ENOENT;
230}
231
232static void termsig_handler(int signum)
233{
234 atomic_cmpxchg(&state, RUNNING, TERMINATE);
235 qemu_notify_event();
236}
237
238
239static void *show_parts(void *arg)
240{
241 char *device = arg;
242 int nbd;
243
244
245
246
247
248
249 nbd = open(device, O_RDWR);
250 if (nbd >= 0) {
251 close(nbd);
252 }
253 return NULL;
254}
255
256static void *nbd_client_thread(void *arg)
257{
258 char *device = arg;
259 NBDExportInfo info = { .request_sizes = false, };
260 QIOChannelSocket *sioc;
261 int fd;
262 int ret;
263 pthread_t show_parts_thread;
264 Error *local_error = NULL;
265
266 sioc = qio_channel_socket_new();
267 if (qio_channel_socket_connect_sync(sioc,
268 saddr,
269 &local_error) < 0) {
270 error_report_err(local_error);
271 goto out;
272 }
273
274 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL,
275 NULL, NULL, NULL, &info, &local_error);
276 if (ret < 0) {
277 if (local_error) {
278 error_report_err(local_error);
279 }
280 goto out_socket;
281 }
282
283 fd = open(device, O_RDWR);
284 if (fd < 0) {
285
286 error_report("Failed to open %s: %m", device);
287 goto out_socket;
288 }
289
290 ret = nbd_init(fd, sioc, &info, &local_error);
291 if (ret < 0) {
292 error_report_err(local_error);
293 goto out_fd;
294 }
295
296
297 pthread_create(&show_parts_thread, NULL, show_parts, device);
298
299 if (verbose) {
300 fprintf(stderr, "NBD device %s is now connected to %s\n",
301 device, srcpath);
302 } else {
303
304 dup2(STDOUT_FILENO, STDERR_FILENO);
305 }
306
307 ret = nbd_client(fd);
308 if (ret) {
309 goto out_fd;
310 }
311 close(fd);
312 object_unref(OBJECT(sioc));
313 kill(getpid(), SIGTERM);
314 return (void *) EXIT_SUCCESS;
315
316out_fd:
317 close(fd);
318out_socket:
319 object_unref(OBJECT(sioc));
320out:
321 kill(getpid(), SIGTERM);
322 return (void *) EXIT_FAILURE;
323}
324
325static int nbd_can_accept(void)
326{
327 return state == RUNNING && nb_fds < shared;
328}
329
330static void nbd_export_closed(NBDExport *exp)
331{
332 assert(state == TERMINATING);
333 state = TERMINATED;
334}
335
336static void nbd_update_server_watch(void);
337
338static void nbd_client_closed(NBDClient *client, bool negotiated)
339{
340 nb_fds--;
341 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
342 state = TERMINATE;
343 }
344 nbd_update_server_watch();
345 nbd_client_put(client);
346}
347
348static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
349 gpointer opaque)
350{
351 if (state >= TERMINATE) {
352 return;
353 }
354
355 nb_fds++;
356 nbd_update_server_watch();
357 nbd_client_new(cioc, tlscreds, NULL, nbd_client_closed);
358}
359
360static void nbd_update_server_watch(void)
361{
362 if (nbd_can_accept()) {
363 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
364 } else {
365 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
366 }
367}
368
369
370static SocketAddress *nbd_build_socket_address(const char *sockpath,
371 const char *bindto,
372 const char *port)
373{
374 SocketAddress *saddr;
375
376 saddr = g_new0(SocketAddress, 1);
377 if (sockpath) {
378 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
379 saddr->u.q_unix.path = g_strdup(sockpath);
380 } else {
381 InetSocketAddress *inet;
382 saddr->type = SOCKET_ADDRESS_TYPE_INET;
383 inet = &saddr->u.inet;
384 inet->host = g_strdup(bindto);
385 if (port) {
386 inet->port = g_strdup(port);
387 } else {
388 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
389 }
390 }
391
392 return saddr;
393}
394
395
396static QemuOptsList file_opts = {
397 .name = "file",
398 .implied_opt_name = "file",
399 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
400 .desc = {
401
402 { }
403 },
404};
405
406static QemuOptsList qemu_object_opts = {
407 .name = "object",
408 .implied_opt_name = "qom-type",
409 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
410 .desc = {
411 { }
412 },
413};
414
415
416
417static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
418{
419 Object *obj;
420 QCryptoTLSCreds *creds;
421
422 obj = object_resolve_path_component(
423 object_get_objects_root(), id);
424 if (!obj) {
425 error_setg(errp, "No TLS credentials with id '%s'",
426 id);
427 return NULL;
428 }
429 creds = (QCryptoTLSCreds *)
430 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
431 if (!creds) {
432 error_setg(errp, "Object with id '%s' is not TLS credentials",
433 id);
434 return NULL;
435 }
436
437 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
438 error_setg(errp,
439 "Expecting TLS credentials with a server endpoint");
440 return NULL;
441 }
442 object_ref(obj);
443 return creds;
444}
445
446static void setup_address_and_port(const char **address, const char **port)
447{
448 if (*address == NULL) {
449 *address = "0.0.0.0";
450 }
451
452 if (*port == NULL) {
453 *port = stringify(NBD_DEFAULT_PORT);
454 }
455}
456
457
458
459
460static const char *socket_activation_validate_opts(const char *device,
461 const char *sockpath,
462 const char *address,
463 const char *port)
464{
465 if (device != NULL) {
466 return "NBD device can't be set when using socket activation";
467 }
468
469 if (sockpath != NULL) {
470 return "Unix socket can't be set when using socket activation";
471 }
472
473 if (address != NULL) {
474 return "The interface can't be set when using socket activation";
475 }
476
477 if (port != NULL) {
478 return "TCP port number can't be set when using socket activation";
479 }
480
481 return NULL;
482}
483
484static void qemu_nbd_shutdown(void)
485{
486 job_cancel_sync_all();
487 bdrv_close_all();
488}
489
490int main(int argc, char **argv)
491{
492 BlockBackend *blk;
493 BlockDriverState *bs;
494 off_t dev_offset = 0;
495 uint16_t nbdflags = 0;
496 bool disconnect = false;
497 const char *bindto = NULL;
498 const char *port = NULL;
499 char *sockpath = NULL;
500 char *device = NULL;
501 off_t fd_size;
502 QemuOpts *sn_opts = NULL;
503 const char *sn_id_or_name = NULL;
504 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
505 struct option lopt[] = {
506 { "help", no_argument, NULL, 'h' },
507 { "version", no_argument, NULL, 'V' },
508 { "bind", required_argument, NULL, 'b' },
509 { "port", required_argument, NULL, 'p' },
510 { "socket", required_argument, NULL, 'k' },
511 { "offset", required_argument, NULL, 'o' },
512 { "read-only", no_argument, NULL, 'r' },
513 { "partition", required_argument, NULL, 'P' },
514 { "connect", required_argument, NULL, 'c' },
515 { "disconnect", no_argument, NULL, 'd' },
516 { "snapshot", no_argument, NULL, 's' },
517 { "load-snapshot", required_argument, NULL, 'l' },
518 { "nocache", no_argument, NULL, 'n' },
519 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
520 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
521 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
522 { "detect-zeroes", required_argument, NULL,
523 QEMU_NBD_OPT_DETECT_ZEROES },
524 { "shared", required_argument, NULL, 'e' },
525 { "format", required_argument, NULL, 'f' },
526 { "persistent", no_argument, NULL, 't' },
527 { "verbose", no_argument, NULL, 'v' },
528 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
529 { "export-name", required_argument, NULL, 'x' },
530 { "description", required_argument, NULL, 'D' },
531 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
532 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
533 { "trace", required_argument, NULL, 'T' },
534 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
535 { NULL, 0, NULL, 0 }
536 };
537 int ch;
538 int opt_ind = 0;
539 char *end;
540 int flags = BDRV_O_RDWR;
541 int partition = -1;
542 int ret = 0;
543 bool seen_cache = false;
544 bool seen_discard = false;
545 bool seen_aio = false;
546 pthread_t client_thread;
547 const char *fmt = NULL;
548 Error *local_err = NULL;
549 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
550 QDict *options = NULL;
551 const char *export_name = "";
552 const char *export_description = NULL;
553 const char *tlscredsid = NULL;
554 bool imageOpts = false;
555 bool writethrough = true;
556 char *trace_file = NULL;
557 bool fork_process = false;
558 int old_stderr = -1;
559 unsigned socket_activation;
560
561
562
563
564 struct sigaction sa_sigterm;
565 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
566 sa_sigterm.sa_handler = termsig_handler;
567 sigaction(SIGTERM, &sa_sigterm, NULL);
568
569#ifdef CONFIG_POSIX
570 signal(SIGPIPE, SIG_IGN);
571#endif
572
573 module_call_init(MODULE_INIT_TRACE);
574 qcrypto_init(&error_fatal);
575
576 module_call_init(MODULE_INIT_QOM);
577 qemu_add_opts(&qemu_object_opts);
578 qemu_add_opts(&qemu_trace_opts);
579 qemu_init_exec_dir(argv[0]);
580
581 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
582 switch (ch) {
583 case 's':
584 flags |= BDRV_O_SNAPSHOT;
585 break;
586 case 'n':
587 optarg = (char *) "none";
588
589 case QEMU_NBD_OPT_CACHE:
590 if (seen_cache) {
591 error_report("-n and --cache can only be specified once");
592 exit(EXIT_FAILURE);
593 }
594 seen_cache = true;
595 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
596 error_report("Invalid cache mode `%s'", optarg);
597 exit(EXIT_FAILURE);
598 }
599 break;
600 case QEMU_NBD_OPT_AIO:
601 if (seen_aio) {
602 error_report("--aio can only be specified once");
603 exit(EXIT_FAILURE);
604 }
605 seen_aio = true;
606 if (!strcmp(optarg, "native")) {
607 flags |= BDRV_O_NATIVE_AIO;
608 } else if (!strcmp(optarg, "threads")) {
609
610 } else {
611 error_report("invalid aio mode `%s'", optarg);
612 exit(EXIT_FAILURE);
613 }
614 break;
615 case QEMU_NBD_OPT_DISCARD:
616 if (seen_discard) {
617 error_report("--discard can only be specified once");
618 exit(EXIT_FAILURE);
619 }
620 seen_discard = true;
621 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
622 error_report("Invalid discard mode `%s'", optarg);
623 exit(EXIT_FAILURE);
624 }
625 break;
626 case QEMU_NBD_OPT_DETECT_ZEROES:
627 detect_zeroes =
628 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
629 optarg,
630 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
631 &local_err);
632 if (local_err) {
633 error_reportf_err(local_err,
634 "Failed to parse detect_zeroes mode: ");
635 exit(EXIT_FAILURE);
636 }
637 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
638 !(flags & BDRV_O_UNMAP)) {
639 error_report("setting detect-zeroes to unmap is not allowed "
640 "without setting discard operation to unmap");
641 exit(EXIT_FAILURE);
642 }
643 break;
644 case 'b':
645 bindto = optarg;
646 break;
647 case 'p':
648 port = optarg;
649 break;
650 case 'o':
651 dev_offset = strtoll (optarg, &end, 0);
652 if (*end) {
653 error_report("Invalid offset `%s'", optarg);
654 exit(EXIT_FAILURE);
655 }
656 if (dev_offset < 0) {
657 error_report("Offset must be positive `%s'", optarg);
658 exit(EXIT_FAILURE);
659 }
660 break;
661 case 'l':
662 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
663 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
664 optarg, false);
665 if (!sn_opts) {
666 error_report("Failed in parsing snapshot param `%s'",
667 optarg);
668 exit(EXIT_FAILURE);
669 }
670 } else {
671 sn_id_or_name = optarg;
672 }
673
674 case 'r':
675 nbdflags |= NBD_FLAG_READ_ONLY;
676 flags &= ~BDRV_O_RDWR;
677 break;
678 case 'P':
679 partition = strtol(optarg, &end, 0);
680 if (*end) {
681 error_report("Invalid partition `%s'", optarg);
682 exit(EXIT_FAILURE);
683 }
684 if (partition < 1 || partition > 8) {
685 error_report("Invalid partition %d", partition);
686 exit(EXIT_FAILURE);
687 }
688 break;
689 case 'k':
690 sockpath = optarg;
691 if (sockpath[0] != '/') {
692 error_report("socket path must be absolute");
693 exit(EXIT_FAILURE);
694 }
695 break;
696 case 'd':
697 disconnect = true;
698 break;
699 case 'c':
700 device = optarg;
701 break;
702 case 'e':
703 shared = strtol(optarg, &end, 0);
704 if (*end) {
705 error_report("Invalid shared device number '%s'", optarg);
706 exit(EXIT_FAILURE);
707 }
708 if (shared < 1) {
709 error_report("Shared device number must be greater than 0");
710 exit(EXIT_FAILURE);
711 }
712 break;
713 case 'f':
714 fmt = optarg;
715 break;
716 case 't':
717 persistent = 1;
718 break;
719 case 'x':
720 export_name = optarg;
721 break;
722 case 'D':
723 export_description = optarg;
724 break;
725 case 'v':
726 verbose = 1;
727 break;
728 case 'V':
729 version(argv[0]);
730 exit(0);
731 break;
732 case 'h':
733 usage(argv[0]);
734 exit(0);
735 break;
736 case '?':
737 error_report("Try `%s --help' for more information.", argv[0]);
738 exit(EXIT_FAILURE);
739 case QEMU_NBD_OPT_OBJECT: {
740 QemuOpts *opts;
741 opts = qemu_opts_parse_noisily(&qemu_object_opts,
742 optarg, true);
743 if (!opts) {
744 exit(EXIT_FAILURE);
745 }
746 } break;
747 case QEMU_NBD_OPT_TLSCREDS:
748 tlscredsid = optarg;
749 break;
750 case QEMU_NBD_OPT_IMAGE_OPTS:
751 imageOpts = true;
752 break;
753 case 'T':
754 g_free(trace_file);
755 trace_file = trace_opt_parse(optarg);
756 break;
757 case QEMU_NBD_OPT_FORK:
758 fork_process = true;
759 break;
760 }
761 }
762
763 if ((argc - optind) != 1) {
764 error_report("Invalid number of arguments");
765 error_printf("Try `%s --help' for more information.\n", argv[0]);
766 exit(EXIT_FAILURE);
767 }
768
769 qemu_opts_foreach(&qemu_object_opts,
770 user_creatable_add_opts_foreach,
771 NULL, &error_fatal);
772
773 if (!trace_init_backends()) {
774 exit(1);
775 }
776 trace_init_file(trace_file);
777 qemu_set_log(LOG_TRACE);
778
779 socket_activation = check_socket_activation();
780 if (socket_activation == 0) {
781 setup_address_and_port(&bindto, &port);
782 } else {
783
784 const char *err_msg = socket_activation_validate_opts(device, sockpath,
785 bindto, port);
786 if (err_msg != NULL) {
787 error_report("%s", err_msg);
788 exit(EXIT_FAILURE);
789 }
790
791
792 if (socket_activation > 1) {
793 error_report("qemu-nbd does not support socket activation with %s > 1",
794 "LISTEN_FDS");
795 exit(EXIT_FAILURE);
796 }
797 }
798
799 if (tlscredsid) {
800 if (sockpath) {
801 error_report("TLS is only supported with IPv4/IPv6");
802 exit(EXIT_FAILURE);
803 }
804 if (device) {
805 error_report("TLS is not supported with a host device");
806 exit(EXIT_FAILURE);
807 }
808 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
809 if (local_err) {
810 error_report("Failed to get TLS creds %s",
811 error_get_pretty(local_err));
812 exit(EXIT_FAILURE);
813 }
814 }
815
816 if (disconnect) {
817 int nbdfd = open(argv[optind], O_RDWR);
818 if (nbdfd < 0) {
819 error_report("Cannot open %s: %s", argv[optind],
820 strerror(errno));
821 exit(EXIT_FAILURE);
822 }
823 nbd_disconnect(nbdfd);
824
825 close(nbdfd);
826
827 printf("%s disconnected\n", argv[optind]);
828
829 return 0;
830 }
831
832 if ((device && !verbose) || fork_process) {
833 int stderr_fd[2];
834 pid_t pid;
835 int ret;
836
837 if (qemu_pipe(stderr_fd) < 0) {
838 error_report("Error setting up communication pipe: %s",
839 strerror(errno));
840 exit(EXIT_FAILURE);
841 }
842
843
844
845
846 pid = fork();
847 if (pid < 0) {
848 error_report("Failed to fork: %s", strerror(errno));
849 exit(EXIT_FAILURE);
850 } else if (pid == 0) {
851 close(stderr_fd[0]);
852 ret = qemu_daemon(1, 0);
853
854
855 old_stderr = dup(STDERR_FILENO);
856 dup2(stderr_fd[1], STDERR_FILENO);
857 if (ret < 0) {
858 error_report("Failed to daemonize: %s", strerror(errno));
859 exit(EXIT_FAILURE);
860 }
861
862
863 close(stderr_fd[1]);
864 } else {
865 bool errors = false;
866 char *buf;
867
868
869
870
871 close(stderr_fd[1]);
872 buf = g_malloc(1024);
873 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
874 errors = true;
875 ret = qemu_write_full(STDERR_FILENO, buf, ret);
876 if (ret < 0) {
877 exit(EXIT_FAILURE);
878 }
879 }
880 if (ret < 0) {
881 error_report("Cannot read from daemon: %s",
882 strerror(errno));
883 exit(EXIT_FAILURE);
884 }
885
886
887
888
889 exit(errors);
890 }
891 }
892
893 if (device != NULL && sockpath == NULL) {
894 sockpath = g_malloc(128);
895 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
896 }
897
898 server = qio_net_listener_new();
899 if (socket_activation == 0) {
900 saddr = nbd_build_socket_address(sockpath, bindto, port);
901 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) {
902 object_unref(OBJECT(server));
903 error_report_err(local_err);
904 exit(EXIT_FAILURE);
905 }
906 } else {
907 size_t i;
908
909 for (i = 0; i < socket_activation; i++) {
910 QIOChannelSocket *sioc;
911 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
912 &local_err);
913 if (sioc == NULL) {
914 object_unref(OBJECT(server));
915 error_report("Failed to use socket activation: %s",
916 error_get_pretty(local_err));
917 exit(EXIT_FAILURE);
918 }
919 qio_net_listener_add(server, sioc);
920 object_unref(OBJECT(sioc));
921 }
922 }
923
924 if (qemu_init_main_loop(&local_err)) {
925 error_report_err(local_err);
926 exit(EXIT_FAILURE);
927 }
928 bdrv_init();
929 atexit(qemu_nbd_shutdown);
930
931 srcpath = argv[optind];
932 if (imageOpts) {
933 QemuOpts *opts;
934 if (fmt) {
935 error_report("--image-opts and -f are mutually exclusive");
936 exit(EXIT_FAILURE);
937 }
938 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
939 if (!opts) {
940 qemu_opts_reset(&file_opts);
941 exit(EXIT_FAILURE);
942 }
943 options = qemu_opts_to_qdict(opts, NULL);
944 qemu_opts_reset(&file_opts);
945 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
946 } else {
947 if (fmt) {
948 options = qdict_new();
949 qdict_put_str(options, "driver", fmt);
950 }
951 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
952 }
953
954 if (!blk) {
955 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
956 argv[optind]);
957 exit(EXIT_FAILURE);
958 }
959 bs = blk_bs(blk);
960
961 blk_set_enable_write_cache(blk, !writethrough);
962
963 if (sn_opts) {
964 ret = bdrv_snapshot_load_tmp(bs,
965 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
966 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
967 &local_err);
968 } else if (sn_id_or_name) {
969 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
970 &local_err);
971 }
972 if (ret < 0) {
973 error_reportf_err(local_err, "Failed to load snapshot: ");
974 exit(EXIT_FAILURE);
975 }
976
977 bs->detect_zeroes = detect_zeroes;
978 fd_size = blk_getlength(blk);
979 if (fd_size < 0) {
980 error_report("Failed to determine the image length: %s",
981 strerror(-fd_size));
982 exit(EXIT_FAILURE);
983 }
984
985 if (dev_offset >= fd_size) {
986 error_report("Offset (%lld) has to be smaller than the image size "
987 "(%lld)",
988 (long long int)dev_offset, (long long int)fd_size);
989 exit(EXIT_FAILURE);
990 }
991 fd_size -= dev_offset;
992
993 if (partition != -1) {
994 ret = find_partition(blk, partition, &dev_offset, &fd_size);
995 if (ret < 0) {
996 error_report("Could not find partition %d: %s", partition,
997 strerror(-ret));
998 exit(EXIT_FAILURE);
999 }
1000 }
1001
1002 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1003 writethrough, NULL, &error_fatal);
1004 nbd_export_set_name(exp, export_name);
1005 nbd_export_set_description(exp, export_description);
1006
1007 if (device) {
1008 int ret;
1009
1010 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1011 if (ret != 0) {
1012 error_report("Failed to create client thread: %s", strerror(ret));
1013 exit(EXIT_FAILURE);
1014 }
1015 } else {
1016
1017 memset(&client_thread, 0, sizeof(client_thread));
1018 }
1019
1020 nbd_update_server_watch();
1021
1022
1023
1024 if (chdir("/") < 0) {
1025 error_report("Could not chdir to root directory: %s",
1026 strerror(errno));
1027 exit(EXIT_FAILURE);
1028 }
1029
1030 if (fork_process) {
1031 dup2(old_stderr, STDERR_FILENO);
1032 close(old_stderr);
1033 }
1034
1035 state = RUNNING;
1036 do {
1037 main_loop_wait(false);
1038 if (state == TERMINATE) {
1039 state = TERMINATING;
1040 nbd_export_close(exp);
1041 nbd_export_put(exp);
1042 exp = NULL;
1043 }
1044 } while (state != TERMINATED);
1045
1046 blk_unref(blk);
1047 if (sockpath) {
1048 unlink(sockpath);
1049 }
1050
1051 qemu_opts_del(sn_opts);
1052
1053 if (device) {
1054 void *ret;
1055 pthread_join(client_thread, &ret);
1056 exit(ret != NULL);
1057 } else {
1058 exit(EXIT_SUCCESS);
1059 }
1060}
1061
