ppc/pnv: Add support for POWER8+ LPC Controller
[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 "qemu/log.h"
31 #include "qemu/systemd.h"
32 #include "block/snapshot.h"
33 #include "qapi/util.h"
34 #include "qapi/qmp/qstring.h"
35 #include "qom/object_interfaces.h"
36 #include "io/channel-socket.h"
37 #include "crypto/init.h"
38 #include "trace/control.h"
39
40 #include <getopt.h>
41 #include <libgen.h>
42 #include <pthread.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
56 static NBDExport *exp;
57 static bool newproto;
58 static int verbose;
59 static char *srcpath;
60 static SocketAddress *saddr;
61 static int persistent = 0;
62 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
63 static int shared = 1;
64 static int nb_fds;
65 static QIOChannelSocket *server_ioc;
66 static int server_watch = -1;
67 static QCryptoTLSCreds *tlscreds;
68
69 static 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"
125 "Report bugs to <qemu-devel@nongnu.org>\n"
126 , name, NBD_DEFAULT_PORT, "DEVICE");
127 }
128
129 static void version(const char *name)
130 {
131 printf(
132 "%s version 0.0.1\n"
133 "Written by Anthony Liguori.\n"
134 "\n"
135 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\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
141 struct 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
155 static 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
170 static 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
231 static void termsig_handler(int signum)
232 {
233 atomic_cmpxchg(&state, RUNNING, TERMINATE);
234 qemu_notify_event();
235 }
236
237
238 static void *show_parts(void *arg)
239 {
240 char *device = arg;
241 int nbd;
242
243 /* linux just needs an open() to trigger
244 * the partition table update
245 * but remember to load the module with max_part != 0 :
246 * modprobe nbd max_part=63
247 */
248 nbd = open(device, O_RDWR);
249 if (nbd >= 0) {
250 close(nbd);
251 }
252 return NULL;
253 }
254
255 static void *nbd_client_thread(void *arg)
256 {
257 char *device = arg;
258 off_t size;
259 uint16_t nbdflags;
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, &nbdflags,
275 NULL, NULL, NULL,
276 &size, &local_error);
277 if (ret < 0) {
278 if (local_error) {
279 error_report_err(local_error);
280 }
281 goto out_socket;
282 }
283
284 fd = open(device, O_RDWR);
285 if (fd < 0) {
286 /* Linux-only, we can use %m in printf. */
287 error_report("Failed to open %s: %m", device);
288 goto out_socket;
289 }
290
291 ret = nbd_init(fd, sioc, nbdflags, size);
292 if (ret < 0) {
293 goto out_fd;
294 }
295
296 /* update partition table */
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 /* Close stderr so that the qemu-nbd process exits. */
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
316 out_fd:
317 close(fd);
318 out_socket:
319 object_unref(OBJECT(sioc));
320 out:
321 kill(getpid(), SIGTERM);
322 return (void *) EXIT_FAILURE;
323 }
324
325 static int nbd_can_accept(void)
326 {
327 return nb_fds < shared;
328 }
329
330 static void nbd_export_closed(NBDExport *exp)
331 {
332 assert(state == TERMINATING);
333 state = TERMINATED;
334 }
335
336 static void nbd_update_server_watch(void);
337
338 static void nbd_client_closed(NBDClient *client)
339 {
340 nb_fds--;
341 if (nb_fds == 0 && !persistent && state == RUNNING) {
342 state = TERMINATE;
343 }
344 nbd_update_server_watch();
345 nbd_client_put(client);
346 }
347
348 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
349 {
350 QIOChannelSocket *cioc;
351
352 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
353 NULL);
354 if (!cioc) {
355 return TRUE;
356 }
357
358 if (state >= TERMINATE) {
359 object_unref(OBJECT(cioc));
360 return TRUE;
361 }
362
363 nb_fds++;
364 nbd_update_server_watch();
365 nbd_client_new(newproto ? NULL : exp, cioc,
366 tlscreds, NULL, nbd_client_closed);
367 object_unref(OBJECT(cioc));
368
369 return TRUE;
370 }
371
372 static void nbd_update_server_watch(void)
373 {
374 if (nbd_can_accept()) {
375 if (server_watch == -1) {
376 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
377 G_IO_IN,
378 nbd_accept,
379 NULL, NULL);
380 }
381 } else {
382 if (server_watch != -1) {
383 g_source_remove(server_watch);
384 server_watch = -1;
385 }
386 }
387 }
388
389
390 static SocketAddress *nbd_build_socket_address(const char *sockpath,
391 const char *bindto,
392 const char *port)
393 {
394 SocketAddress *saddr;
395
396 saddr = g_new0(SocketAddress, 1);
397 if (sockpath) {
398 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
399 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
400 saddr->u.q_unix.data->path = g_strdup(sockpath);
401 } else {
402 InetSocketAddress *inet;
403 saddr->type = SOCKET_ADDRESS_KIND_INET;
404 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
405 inet->host = g_strdup(bindto);
406 if (port) {
407 inet->port = g_strdup(port);
408 } else {
409 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
410 }
411 }
412
413 return saddr;
414 }
415
416
417 static QemuOptsList file_opts = {
418 .name = "file",
419 .implied_opt_name = "file",
420 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
421 .desc = {
422 /* no elements => accept any params */
423 { /* end of list */ }
424 },
425 };
426
427 static QemuOptsList qemu_object_opts = {
428 .name = "object",
429 .implied_opt_name = "qom-type",
430 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
431 .desc = {
432 { }
433 },
434 };
435
436
437
438 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
439 {
440 Object *obj;
441 QCryptoTLSCreds *creds;
442
443 obj = object_resolve_path_component(
444 object_get_objects_root(), id);
445 if (!obj) {
446 error_setg(errp, "No TLS credentials with id '%s'",
447 id);
448 return NULL;
449 }
450 creds = (QCryptoTLSCreds *)
451 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
452 if (!creds) {
453 error_setg(errp, "Object with id '%s' is not TLS credentials",
454 id);
455 return NULL;
456 }
457
458 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
459 error_setg(errp,
460 "Expecting TLS credentials with a server endpoint");
461 return NULL;
462 }
463 object_ref(obj);
464 return creds;
465 }
466
467 static void setup_address_and_port(const char **address, const char **port)
468 {
469 if (*address == NULL) {
470 *address = "0.0.0.0";
471 }
472
473 if (*port == NULL) {
474 *port = stringify(NBD_DEFAULT_PORT);
475 }
476 }
477
478 /*
479 * Check socket parameters compatibility when socket activation is used.
480 */
481 static const char *socket_activation_validate_opts(const char *device,
482 const char *sockpath,
483 const char *address,
484 const char *port)
485 {
486 if (device != NULL) {
487 return "NBD device can't be set when using socket activation";
488 }
489
490 if (sockpath != NULL) {
491 return "Unix socket can't be set when using socket activation";
492 }
493
494 if (address != NULL) {
495 return "The interface can't be set when using socket activation";
496 }
497
498 if (port != NULL) {
499 return "TCP port number can't be set when using socket activation";
500 }
501
502 return NULL;
503 }
504
505 int main(int argc, char **argv)
506 {
507 BlockBackend *blk;
508 BlockDriverState *bs;
509 off_t dev_offset = 0;
510 uint16_t nbdflags = 0;
511 bool disconnect = false;
512 const char *bindto = NULL;
513 const char *port = NULL;
514 char *sockpath = NULL;
515 char *device = NULL;
516 off_t fd_size;
517 QemuOpts *sn_opts = NULL;
518 const char *sn_id_or_name = NULL;
519 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
520 struct option lopt[] = {
521 { "help", no_argument, NULL, 'h' },
522 { "version", no_argument, NULL, 'V' },
523 { "bind", required_argument, NULL, 'b' },
524 { "port", required_argument, NULL, 'p' },
525 { "socket", required_argument, NULL, 'k' },
526 { "offset", required_argument, NULL, 'o' },
527 { "read-only", no_argument, NULL, 'r' },
528 { "partition", required_argument, NULL, 'P' },
529 { "connect", required_argument, NULL, 'c' },
530 { "disconnect", no_argument, NULL, 'd' },
531 { "snapshot", no_argument, NULL, 's' },
532 { "load-snapshot", required_argument, NULL, 'l' },
533 { "nocache", no_argument, NULL, 'n' },
534 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
535 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
536 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
537 { "detect-zeroes", required_argument, NULL,
538 QEMU_NBD_OPT_DETECT_ZEROES },
539 { "shared", required_argument, NULL, 'e' },
540 { "format", required_argument, NULL, 'f' },
541 { "persistent", no_argument, NULL, 't' },
542 { "verbose", no_argument, NULL, 'v' },
543 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
544 { "export-name", required_argument, NULL, 'x' },
545 { "description", required_argument, NULL, 'D' },
546 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
547 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
548 { "trace", required_argument, NULL, 'T' },
549 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
550 { NULL, 0, NULL, 0 }
551 };
552 int ch;
553 int opt_ind = 0;
554 char *end;
555 int flags = BDRV_O_RDWR;
556 int partition = -1;
557 int ret = 0;
558 bool seen_cache = false;
559 bool seen_discard = false;
560 bool seen_aio = false;
561 pthread_t client_thread;
562 const char *fmt = NULL;
563 Error *local_err = NULL;
564 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
565 QDict *options = NULL;
566 const char *export_name = NULL;
567 const char *export_description = NULL;
568 const char *tlscredsid = NULL;
569 bool imageOpts = false;
570 bool writethrough = true;
571 char *trace_file = NULL;
572 bool fork_process = false;
573 int old_stderr = -1;
574 unsigned socket_activation;
575
576 /* The client thread uses SIGTERM to interrupt the server. A signal
577 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
578 */
579 struct sigaction sa_sigterm;
580 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
581 sa_sigterm.sa_handler = termsig_handler;
582 sigaction(SIGTERM, &sa_sigterm, NULL);
583
584 module_call_init(MODULE_INIT_TRACE);
585 qcrypto_init(&error_fatal);
586
587 module_call_init(MODULE_INIT_QOM);
588 qemu_add_opts(&qemu_object_opts);
589 qemu_add_opts(&qemu_trace_opts);
590 qemu_init_exec_dir(argv[0]);
591
592 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
593 switch (ch) {
594 case 's':
595 flags |= BDRV_O_SNAPSHOT;
596 break;
597 case 'n':
598 optarg = (char *) "none";
599 /* fallthrough */
600 case QEMU_NBD_OPT_CACHE:
601 if (seen_cache) {
602 error_report("-n and --cache can only be specified once");
603 exit(EXIT_FAILURE);
604 }
605 seen_cache = true;
606 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
607 error_report("Invalid cache mode `%s'", optarg);
608 exit(EXIT_FAILURE);
609 }
610 break;
611 case QEMU_NBD_OPT_AIO:
612 if (seen_aio) {
613 error_report("--aio can only be specified once");
614 exit(EXIT_FAILURE);
615 }
616 seen_aio = true;
617 if (!strcmp(optarg, "native")) {
618 flags |= BDRV_O_NATIVE_AIO;
619 } else if (!strcmp(optarg, "threads")) {
620 /* this is the default */
621 } else {
622 error_report("invalid aio mode `%s'", optarg);
623 exit(EXIT_FAILURE);
624 }
625 break;
626 case QEMU_NBD_OPT_DISCARD:
627 if (seen_discard) {
628 error_report("--discard can only be specified once");
629 exit(EXIT_FAILURE);
630 }
631 seen_discard = true;
632 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
633 error_report("Invalid discard mode `%s'", optarg);
634 exit(EXIT_FAILURE);
635 }
636 break;
637 case QEMU_NBD_OPT_DETECT_ZEROES:
638 detect_zeroes =
639 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
640 optarg,
641 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
642 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
643 &local_err);
644 if (local_err) {
645 error_reportf_err(local_err,
646 "Failed to parse detect_zeroes mode: ");
647 exit(EXIT_FAILURE);
648 }
649 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
650 !(flags & BDRV_O_UNMAP)) {
651 error_report("setting detect-zeroes to unmap is not allowed "
652 "without setting discard operation to unmap");
653 exit(EXIT_FAILURE);
654 }
655 break;
656 case 'b':
657 bindto = optarg;
658 break;
659 case 'p':
660 port = optarg;
661 break;
662 case 'o':
663 dev_offset = strtoll (optarg, &end, 0);
664 if (*end) {
665 error_report("Invalid offset `%s'", optarg);
666 exit(EXIT_FAILURE);
667 }
668 if (dev_offset < 0) {
669 error_report("Offset must be positive `%s'", optarg);
670 exit(EXIT_FAILURE);
671 }
672 break;
673 case 'l':
674 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
675 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
676 optarg, false);
677 if (!sn_opts) {
678 error_report("Failed in parsing snapshot param `%s'",
679 optarg);
680 exit(EXIT_FAILURE);
681 }
682 } else {
683 sn_id_or_name = optarg;
684 }
685 /* fall through */
686 case 'r':
687 nbdflags |= NBD_FLAG_READ_ONLY;
688 flags &= ~BDRV_O_RDWR;
689 break;
690 case 'P':
691 partition = strtol(optarg, &end, 0);
692 if (*end) {
693 error_report("Invalid partition `%s'", optarg);
694 exit(EXIT_FAILURE);
695 }
696 if (partition < 1 || partition > 8) {
697 error_report("Invalid partition %d", partition);
698 exit(EXIT_FAILURE);
699 }
700 break;
701 case 'k':
702 sockpath = optarg;
703 if (sockpath[0] != '/') {
704 error_report("socket path must be absolute");
705 exit(EXIT_FAILURE);
706 }
707 break;
708 case 'd':
709 disconnect = true;
710 break;
711 case 'c':
712 device = optarg;
713 break;
714 case 'e':
715 shared = strtol(optarg, &end, 0);
716 if (*end) {
717 error_report("Invalid shared device number '%s'", optarg);
718 exit(EXIT_FAILURE);
719 }
720 if (shared < 1) {
721 error_report("Shared device number must be greater than 0");
722 exit(EXIT_FAILURE);
723 }
724 break;
725 case 'f':
726 fmt = optarg;
727 break;
728 case 't':
729 persistent = 1;
730 break;
731 case 'x':
732 export_name = optarg;
733 break;
734 case 'D':
735 export_description = optarg;
736 break;
737 case 'v':
738 verbose = 1;
739 break;
740 case 'V':
741 version(argv[0]);
742 exit(0);
743 break;
744 case 'h':
745 usage(argv[0]);
746 exit(0);
747 break;
748 case '?':
749 error_report("Try `%s --help' for more information.", argv[0]);
750 exit(EXIT_FAILURE);
751 case QEMU_NBD_OPT_OBJECT: {
752 QemuOpts *opts;
753 opts = qemu_opts_parse_noisily(&qemu_object_opts,
754 optarg, true);
755 if (!opts) {
756 exit(EXIT_FAILURE);
757 }
758 } break;
759 case QEMU_NBD_OPT_TLSCREDS:
760 tlscredsid = optarg;
761 break;
762 case QEMU_NBD_OPT_IMAGE_OPTS:
763 imageOpts = true;
764 break;
765 case 'T':
766 g_free(trace_file);
767 trace_file = trace_opt_parse(optarg);
768 break;
769 case QEMU_NBD_OPT_FORK:
770 fork_process = true;
771 break;
772 }
773 }
774
775 if ((argc - optind) != 1) {
776 error_report("Invalid number of arguments");
777 error_printf("Try `%s --help' for more information.\n", argv[0]);
778 exit(EXIT_FAILURE);
779 }
780
781 if (qemu_opts_foreach(&qemu_object_opts,
782 user_creatable_add_opts_foreach,
783 NULL, NULL)) {
784 exit(EXIT_FAILURE);
785 }
786
787 if (!trace_init_backends()) {
788 exit(1);
789 }
790 trace_init_file(trace_file);
791 qemu_set_log(LOG_TRACE);
792
793 socket_activation = check_socket_activation();
794 if (socket_activation == 0) {
795 setup_address_and_port(&bindto, &port);
796 } else {
797 /* Using socket activation - check user didn't use -p etc. */
798 const char *err_msg = socket_activation_validate_opts(device, sockpath,
799 bindto, port);
800 if (err_msg != NULL) {
801 error_report("%s", err_msg);
802 exit(EXIT_FAILURE);
803 }
804
805 /* qemu-nbd can only listen on a single socket. */
806 if (socket_activation > 1) {
807 error_report("qemu-nbd does not support socket activation with %s > 1",
808 "LISTEN_FDS");
809 exit(EXIT_FAILURE);
810 }
811 }
812
813 if (tlscredsid) {
814 if (sockpath) {
815 error_report("TLS is only supported with IPv4/IPv6");
816 exit(EXIT_FAILURE);
817 }
818 if (device) {
819 error_report("TLS is not supported with a host device");
820 exit(EXIT_FAILURE);
821 }
822 if (!export_name) {
823 /* Set the default NBD protocol export name, since
824 * we *must* use new style protocol for TLS */
825 export_name = "";
826 }
827 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
828 if (local_err) {
829 error_report("Failed to get TLS creds %s",
830 error_get_pretty(local_err));
831 exit(EXIT_FAILURE);
832 }
833 }
834
835 if (disconnect) {
836 int nbdfd = open(argv[optind], O_RDWR);
837 if (nbdfd < 0) {
838 error_report("Cannot open %s: %s", argv[optind],
839 strerror(errno));
840 exit(EXIT_FAILURE);
841 }
842 nbd_disconnect(nbdfd);
843
844 close(nbdfd);
845
846 printf("%s disconnected\n", argv[optind]);
847
848 return 0;
849 }
850
851 if ((device && !verbose) || fork_process) {
852 int stderr_fd[2];
853 pid_t pid;
854 int ret;
855
856 if (qemu_pipe(stderr_fd) < 0) {
857 error_report("Error setting up communication pipe: %s",
858 strerror(errno));
859 exit(EXIT_FAILURE);
860 }
861
862 /* Now daemonize, but keep a communication channel open to
863 * print errors and exit with the proper status code.
864 */
865 pid = fork();
866 if (pid < 0) {
867 error_report("Failed to fork: %s", strerror(errno));
868 exit(EXIT_FAILURE);
869 } else if (pid == 0) {
870 close(stderr_fd[0]);
871 ret = qemu_daemon(1, 0);
872
873 /* Temporarily redirect stderr to the parent's pipe... */
874 old_stderr = dup(STDERR_FILENO);
875 dup2(stderr_fd[1], STDERR_FILENO);
876 if (ret < 0) {
877 error_report("Failed to daemonize: %s", strerror(errno));
878 exit(EXIT_FAILURE);
879 }
880
881 /* ... close the descriptor we inherited and go on. */
882 close(stderr_fd[1]);
883 } else {
884 bool errors = false;
885 char *buf;
886
887 /* In the parent. Print error messages from the child until
888 * it closes the pipe.
889 */
890 close(stderr_fd[1]);
891 buf = g_malloc(1024);
892 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
893 errors = true;
894 ret = qemu_write_full(STDERR_FILENO, buf, ret);
895 if (ret < 0) {
896 exit(EXIT_FAILURE);
897 }
898 }
899 if (ret < 0) {
900 error_report("Cannot read from daemon: %s",
901 strerror(errno));
902 exit(EXIT_FAILURE);
903 }
904
905 /* Usually the daemon should not print any message.
906 * Exit with zero status in that case.
907 */
908 exit(errors);
909 }
910 }
911
912 if (device != NULL && sockpath == NULL) {
913 sockpath = g_malloc(128);
914 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
915 }
916
917 if (socket_activation == 0) {
918 server_ioc = qio_channel_socket_new();
919 saddr = nbd_build_socket_address(sockpath, bindto, port);
920 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
921 object_unref(OBJECT(server_ioc));
922 error_report_err(local_err);
923 return 1;
924 }
925 } else {
926 /* See comment in check_socket_activation above. */
927 assert(socket_activation == 1);
928 server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
929 &local_err);
930 if (server_ioc == NULL) {
931 error_report("Failed to use socket activation: %s",
932 error_get_pretty(local_err));
933 exit(EXIT_FAILURE);
934 }
935 }
936
937 if (qemu_init_main_loop(&local_err)) {
938 error_report_err(local_err);
939 exit(EXIT_FAILURE);
940 }
941 bdrv_init();
942 atexit(bdrv_close_all);
943
944 srcpath = argv[optind];
945 if (imageOpts) {
946 QemuOpts *opts;
947 if (fmt) {
948 error_report("--image-opts and -f are mutually exclusive");
949 exit(EXIT_FAILURE);
950 }
951 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
952 if (!opts) {
953 qemu_opts_reset(&file_opts);
954 exit(EXIT_FAILURE);
955 }
956 options = qemu_opts_to_qdict(opts, NULL);
957 qemu_opts_reset(&file_opts);
958 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
959 } else {
960 if (fmt) {
961 options = qdict_new();
962 qdict_put(options, "driver", qstring_from_str(fmt));
963 }
964 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
965 }
966
967 if (!blk) {
968 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
969 argv[optind]);
970 exit(EXIT_FAILURE);
971 }
972 bs = blk_bs(blk);
973
974 blk_set_enable_write_cache(blk, !writethrough);
975
976 if (sn_opts) {
977 ret = bdrv_snapshot_load_tmp(bs,
978 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
979 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
980 &local_err);
981 } else if (sn_id_or_name) {
982 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
983 &local_err);
984 }
985 if (ret < 0) {
986 error_reportf_err(local_err, "Failed to load snapshot: ");
987 exit(EXIT_FAILURE);
988 }
989
990 bs->detect_zeroes = detect_zeroes;
991 fd_size = blk_getlength(blk);
992 if (fd_size < 0) {
993 error_report("Failed to determine the image length: %s",
994 strerror(-fd_size));
995 exit(EXIT_FAILURE);
996 }
997
998 if (dev_offset >= fd_size) {
999 error_report("Offset (%lld) has to be smaller than the image size "
1000 "(%lld)",
1001 (long long int)dev_offset, (long long int)fd_size);
1002 exit(EXIT_FAILURE);
1003 }
1004 fd_size -= dev_offset;
1005
1006 if (partition != -1) {
1007 ret = find_partition(blk, partition, &dev_offset, &fd_size);
1008 if (ret < 0) {
1009 error_report("Could not find partition %d: %s", partition,
1010 strerror(-ret));
1011 exit(EXIT_FAILURE);
1012 }
1013 }
1014
1015 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1016 writethrough, NULL, &local_err);
1017 if (!exp) {
1018 error_report_err(local_err);
1019 exit(EXIT_FAILURE);
1020 }
1021 if (export_name) {
1022 nbd_export_set_name(exp, export_name);
1023 nbd_export_set_description(exp, export_description);
1024 newproto = true;
1025 } else if (export_description) {
1026 error_report("Export description requires an export name");
1027 exit(EXIT_FAILURE);
1028 }
1029
1030 if (device) {
1031 int ret;
1032
1033 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1034 if (ret != 0) {
1035 error_report("Failed to create client thread: %s", strerror(ret));
1036 exit(EXIT_FAILURE);
1037 }
1038 } else {
1039 /* Shut up GCC warnings. */
1040 memset(&client_thread, 0, sizeof(client_thread));
1041 }
1042
1043 nbd_update_server_watch();
1044
1045 /* now when the initialization is (almost) complete, chdir("/")
1046 * to free any busy filesystems */
1047 if (chdir("/") < 0) {
1048 error_report("Could not chdir to root directory: %s",
1049 strerror(errno));
1050 exit(EXIT_FAILURE);
1051 }
1052
1053 if (fork_process) {
1054 dup2(old_stderr, STDERR_FILENO);
1055 close(old_stderr);
1056 }
1057
1058 state = RUNNING;
1059 do {
1060 main_loop_wait(false);
1061 if (state == TERMINATE) {
1062 state = TERMINATING;
1063 nbd_export_close(exp);
1064 nbd_export_put(exp);
1065 exp = NULL;
1066 }
1067 } while (state != TERMINATED);
1068
1069 blk_unref(blk);
1070 if (sockpath) {
1071 unlink(sockpath);
1072 }
1073
1074 qemu_opts_del(sn_opts);
1075
1076 if (device) {
1077 void *ret;
1078 pthread_join(client_thread, &ret);
1079 exit(ret != NULL);
1080 } else {
1081 exit(EXIT_SUCCESS);
1082 }
1083 }