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seccomp: report more useful errors from seccomp
[qemu/kevin.git] / qemu-nbd.c
blob941ba729c2f8c98166bfd238be41e88d96207b79
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 <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 #ifdef __linux__
47 #define HAVE_NBD_DEVICE 1
48 #else
49 #define HAVE_NBD_DEVICE 0
50 #endif
51
52 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
53 #define QEMU_NBD_OPT_CACHE 256
54 #define QEMU_NBD_OPT_AIO 257
55 #define QEMU_NBD_OPT_DISCARD 258
56 #define QEMU_NBD_OPT_DETECT_ZEROES 259
57 #define QEMU_NBD_OPT_OBJECT 260
58 #define QEMU_NBD_OPT_TLSCREDS 261
59 #define QEMU_NBD_OPT_IMAGE_OPTS 262
60 #define QEMU_NBD_OPT_FORK 263
61 #define QEMU_NBD_OPT_TLSAUTHZ 264
62
63 #define MBR_SIZE 512
64
65 static NBDExport *export;
66 static int verbose;
67 static char *srcpath;
68 static SocketAddress *saddr;
69 static int persistent = 0;
70 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
71 static int shared = 1;
72 static int nb_fds;
73 static QIONetListener *server;
74 static QCryptoTLSCreds *tlscreds;
75 static const char *tlsauthz;
76
77 static void usage(const char *name)
78 {
79 (printf) (
80 "Usage: %s [OPTIONS] FILE\n"
81 " or: %s -L [OPTIONS]\n"
82 "QEMU Disk Network Block Device Utility\n"
83 "\n"
84 " -h, --help display this help and exit\n"
85 " -V, --version output version information and exit\n"
86 "\n"
87 "Connection properties:\n"
88 " -p, --port=PORT port to listen on (default `%d')\n"
89 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
90 " -k, --socket=PATH path to the unix socket\n"
91 " (default '"SOCKET_PATH"')\n"
92 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
93 " -t, --persistent don't exit on the last connection\n"
94 " -v, --verbose display extra debugging information\n"
95 " -x, --export-name=NAME expose export by name (default is empty string)\n"
96 " -D, --description=TEXT export a human-readable description\n"
97 "\n"
98 "Exposing part of the image:\n"
99 " -o, --offset=OFFSET offset into the image\n"
100 " -P, --partition=NUM only expose partition NUM\n"
101 " -B, --bitmap=NAME expose a persistent dirty bitmap\n"
102 "\n"
103 "General purpose options:\n"
104 " -L, --list list exports available from another NBD server\n"
105 " --object type,id=ID,... define an object such as 'secret' for providing\n"
106 " passwords and/or encryption keys\n"
107 " --tls-creds=ID use id of an earlier --object to provide TLS\n"
108 " --tls-authz=ID use id of an earlier --object to provide\n"
109 " authorization\n"
110 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
111 " specify tracing options\n"
112 " --fork fork off the server process and exit the parent\n"
113 " once the server is running\n"
114 #if HAVE_NBD_DEVICE
115 "\n"
116 "Kernel NBD client support:\n"
117 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
118 " -d, --disconnect disconnect the specified device\n"
119 #endif
120 "\n"
121 "Block device options:\n"
122 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
123 " -r, --read-only export read-only\n"
124 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
125 " file with backing_file=FILE, redirect the write to\n"
126 " the temporary one\n"
127 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
128 " load an internal snapshot inside FILE and export it\n"
129 " as an read-only device, SNAPSHOT_PARAM format is\n"
130 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
131 " '[ID_OR_NAME]'\n"
132 " -n, --nocache disable host cache\n"
133 " --cache=MODE set cache mode (none, writeback, ...)\n"
134 " --aio=MODE set AIO mode (native or threads)\n"
135 " --discard=MODE set discard mode (ignore, unmap)\n"
136 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
137 " --image-opts treat FILE as a full set of image options\n"
138 "\n"
139 QEMU_HELP_BOTTOM "\n"
140 , name, name, NBD_DEFAULT_PORT, "DEVICE");
141 }
142
143 static void version(const char *name)
144 {
145 printf(
146 "%s " QEMU_FULL_VERSION "\n"
147 "Written by Anthony Liguori.\n"
148 "\n"
149 QEMU_COPYRIGHT "\n"
150 "This is free software; see the source for copying conditions. There is NO\n"
151 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
152 , name);
153 }
154
155 struct partition_record
156 {
157 uint8_t bootable;
158 uint8_t start_head;
159 uint32_t start_cylinder;
160 uint8_t start_sector;
161 uint8_t system;
162 uint8_t end_head;
163 uint8_t end_cylinder;
164 uint8_t end_sector;
165 uint32_t start_sector_abs;
166 uint32_t nb_sectors_abs;
167 };
168
169 static void read_partition(uint8_t *p, struct partition_record *r)
170 {
171 r->bootable = p[0];
172 r->start_head = p[1];
173 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
174 r->start_sector = p[2] & 0x3f;
175 r->system = p[4];
176 r->end_head = p[5];
177 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
178 r->end_sector = p[6] & 0x3f;
179
180 r->start_sector_abs = ldl_le_p(p + 8);
181 r->nb_sectors_abs = ldl_le_p(p + 12);
182 }
183
184 static int find_partition(BlockBackend *blk, int partition,
185 uint64_t *offset, uint64_t *size)
186 {
187 struct partition_record mbr[4];
188 uint8_t data[MBR_SIZE];
189 int i;
190 int ext_partnum = 4;
191 int ret;
192
193 ret = blk_pread(blk, 0, data, sizeof(data));
194 if (ret < 0) {
195 error_report("error while reading: %s", strerror(-ret));
196 exit(EXIT_FAILURE);
197 }
198
199 if (data[510] != 0x55 || data[511] != 0xaa) {
200 return -EINVAL;
201 }
202
203 for (i = 0; i < 4; i++) {
204 read_partition(&data[446 + 16 * i], &mbr[i]);
205
206 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
207 continue;
208 }
209
210 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
211 struct partition_record ext[4];
212 uint8_t data1[MBR_SIZE];
213 int j;
214
215 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
216 data1, sizeof(data1));
217 if (ret < 0) {
218 error_report("error while reading: %s", strerror(-ret));
219 exit(EXIT_FAILURE);
220 }
221
222 for (j = 0; j < 4; j++) {
223 read_partition(&data1[446 + 16 * j], &ext[j]);
224 if (!ext[j].system || !ext[j].nb_sectors_abs) {
225 continue;
226 }
227
228 if ((ext_partnum + j + 1) == partition) {
229 *offset = (uint64_t)ext[j].start_sector_abs << 9;
230 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
231 return 0;
232 }
233 }
234 ext_partnum += 4;
235 } else if ((i + 1) == partition) {
236 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
237 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
238 return 0;
239 }
240 }
241
242 return -ENOENT;
243 }
244
245 static void termsig_handler(int signum)
246 {
247 atomic_cmpxchg(&state, RUNNING, TERMINATE);
248 qemu_notify_event();
249 }
250
251
252 static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
253 const char *hostname)
254 {
255 int ret = EXIT_FAILURE;
256 int rc;
257 Error *err = NULL;
258 QIOChannelSocket *sioc;
259 NBDExportInfo *list;
260 int i, j;
261
262 sioc = qio_channel_socket_new();
263 if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) {
264 error_report_err(err);
265 return EXIT_FAILURE;
266 }
267 rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list,
268 &err);
269 if (rc < 0) {
270 if (err) {
271 error_report_err(err);
272 }
273 goto out;
274 }
275 printf("exports available: %d\n", rc);
276 for (i = 0; i < rc; i++) {
277 printf(" export: '%s'\n", list[i].name);
278 if (list[i].description && *list[i].description) {
279 printf(" description: %s\n", list[i].description);
280 }
281 if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
282 printf(" size: %" PRIu64 "\n", list[i].size);
283 printf(" flags: 0x%x (", list[i].flags);
284 if (list[i].flags & NBD_FLAG_READ_ONLY) {
285 printf(" readonly");
286 }
287 if (list[i].flags & NBD_FLAG_SEND_FLUSH) {
288 printf(" flush");
289 }
290 if (list[i].flags & NBD_FLAG_SEND_FUA) {
291 printf(" fua");
292 }
293 if (list[i].flags & NBD_FLAG_ROTATIONAL) {
294 printf(" rotational");
295 }
296 if (list[i].flags & NBD_FLAG_SEND_TRIM) {
297 printf(" trim");
298 }
299 if (list[i].flags & NBD_FLAG_SEND_WRITE_ZEROES) {
300 printf(" zeroes");
301 }
302 if (list[i].flags & NBD_FLAG_SEND_DF) {
303 printf(" df");
304 }
305 if (list[i].flags & NBD_FLAG_CAN_MULTI_CONN) {
306 printf(" multi");
307 }
308 if (list[i].flags & NBD_FLAG_SEND_RESIZE) {
309 printf(" resize");
310 }
311 if (list[i].flags & NBD_FLAG_SEND_CACHE) {
312 printf(" cache");
313 }
314 printf(" )\n");
315 }
316 if (list[i].min_block) {
317 printf(" min block: %u\n", list[i].min_block);
318 printf(" opt block: %u\n", list[i].opt_block);
319 printf(" max block: %u\n", list[i].max_block);
320 }
321 if (list[i].n_contexts) {
322 printf(" available meta contexts: %d\n", list[i].n_contexts);
323 for (j = 0; j < list[i].n_contexts; j++) {
324 printf(" %s\n", list[i].contexts[j]);
325 }
326 }
327 }
328 nbd_free_export_list(list, rc);
329
330 ret = EXIT_SUCCESS;
331 out:
332 object_unref(OBJECT(sioc));
333 return ret;
334 }
335
336
337 #if HAVE_NBD_DEVICE
338 static void *show_parts(void *arg)
339 {
340 char *device = arg;
341 int nbd;
342
343 /* linux just needs an open() to trigger
344 * the partition table update
345 * but remember to load the module with max_part != 0 :
346 * modprobe nbd max_part=63
347 */
348 nbd = open(device, O_RDWR);
349 if (nbd >= 0) {
350 close(nbd);
351 }
352 return NULL;
353 }
354
355 static void *nbd_client_thread(void *arg)
356 {
357 char *device = arg;
358 NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") };
359 QIOChannelSocket *sioc;
360 int fd;
361 int ret;
362 pthread_t show_parts_thread;
363 Error *local_error = NULL;
364
365 sioc = qio_channel_socket_new();
366 if (qio_channel_socket_connect_sync(sioc,
367 saddr,
368 &local_error) < 0) {
369 error_report_err(local_error);
370 goto out;
371 }
372
373 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc),
374 NULL, NULL, NULL, &info, &local_error);
375 if (ret < 0) {
376 if (local_error) {
377 error_report_err(local_error);
378 }
379 goto out_socket;
380 }
381
382 fd = open(device, O_RDWR);
383 if (fd < 0) {
384 /* Linux-only, we can use %m in printf. */
385 error_report("Failed to open %s: %m", device);
386 goto out_socket;
387 }
388
389 ret = nbd_init(fd, sioc, &info, &local_error);
390 if (ret < 0) {
391 error_report_err(local_error);
392 goto out_fd;
393 }
394
395 /* update partition table */
396 pthread_create(&show_parts_thread, NULL, show_parts, device);
397
398 if (verbose) {
399 fprintf(stderr, "NBD device %s is now connected to %s\n",
400 device, srcpath);
401 } else {
402 /* Close stderr so that the qemu-nbd process exits. */
403 dup2(STDOUT_FILENO, STDERR_FILENO);
404 }
405
406 ret = nbd_client(fd);
407 if (ret) {
408 goto out_fd;
409 }
410 close(fd);
411 object_unref(OBJECT(sioc));
412 g_free(info.name);
413 kill(getpid(), SIGTERM);
414 return (void *) EXIT_SUCCESS;
415
416 out_fd:
417 close(fd);
418 out_socket:
419 object_unref(OBJECT(sioc));
420 out:
421 g_free(info.name);
422 kill(getpid(), SIGTERM);
423 return (void *) EXIT_FAILURE;
424 }
425 #endif /* HAVE_NBD_DEVICE */
426
427 static int nbd_can_accept(void)
428 {
429 return state == RUNNING && nb_fds < shared;
430 }
431
432 static void nbd_export_closed(NBDExport *export)
433 {
434 assert(state == TERMINATING);
435 state = TERMINATED;
436 }
437
438 static void nbd_update_server_watch(void);
439
440 static void nbd_client_closed(NBDClient *client, bool negotiated)
441 {
442 nb_fds--;
443 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
444 state = TERMINATE;
445 }
446 nbd_update_server_watch();
447 nbd_client_put(client);
448 }
449
450 static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
451 gpointer opaque)
452 {
453 if (state >= TERMINATE) {
454 return;
455 }
456
457 nb_fds++;
458 nbd_update_server_watch();
459 nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
460 }
461
462 static void nbd_update_server_watch(void)
463 {
464 if (nbd_can_accept()) {
465 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
466 } else {
467 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
468 }
469 }
470
471
472 static SocketAddress *nbd_build_socket_address(const char *sockpath,
473 const char *bindto,
474 const char *port)
475 {
476 SocketAddress *saddr;
477
478 saddr = g_new0(SocketAddress, 1);
479 if (sockpath) {
480 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
481 saddr->u.q_unix.path = g_strdup(sockpath);
482 } else {
483 InetSocketAddress *inet;
484 saddr->type = SOCKET_ADDRESS_TYPE_INET;
485 inet = &saddr->u.inet;
486 inet->host = g_strdup(bindto);
487 if (port) {
488 inet->port = g_strdup(port);
489 } else {
490 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
491 }
492 }
493
494 return saddr;
495 }
496
497
498 static QemuOptsList file_opts = {
499 .name = "file",
500 .implied_opt_name = "file",
501 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
502 .desc = {
503 /* no elements => accept any params */
504 { /* end of list */ }
505 },
506 };
507
508 static QemuOptsList qemu_object_opts = {
509 .name = "object",
510 .implied_opt_name = "qom-type",
511 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
512 .desc = {
513 { }
514 },
515 };
516
517
518
519 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
520 Error **errp)
521 {
522 Object *obj;
523 QCryptoTLSCreds *creds;
524
525 obj = object_resolve_path_component(
526 object_get_objects_root(), id);
527 if (!obj) {
528 error_setg(errp, "No TLS credentials with id '%s'",
529 id);
530 return NULL;
531 }
532 creds = (QCryptoTLSCreds *)
533 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
534 if (!creds) {
535 error_setg(errp, "Object with id '%s' is not TLS credentials",
536 id);
537 return NULL;
538 }
539
540 if (list) {
541 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
542 error_setg(errp,
543 "Expecting TLS credentials with a client endpoint");
544 return NULL;
545 }
546 } else {
547 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
548 error_setg(errp,
549 "Expecting TLS credentials with a server endpoint");
550 return NULL;
551 }
552 }
553 object_ref(obj);
554 return creds;
555 }
556
557 static void setup_address_and_port(const char **address, const char **port)
558 {
559 if (*address == NULL) {
560 *address = "0.0.0.0";
561 }
562
563 if (*port == NULL) {
564 *port = stringify(NBD_DEFAULT_PORT);
565 }
566 }
567
568 /*
569 * Check socket parameters compatibility when socket activation is used.
570 */
571 static const char *socket_activation_validate_opts(const char *device,
572 const char *sockpath,
573 const char *address,
574 const char *port,
575 bool list)
576 {
577 if (device != NULL) {
578 return "NBD device can't be set when using socket activation";
579 }
580
581 if (sockpath != NULL) {
582 return "Unix socket can't be set when using socket activation";
583 }
584
585 if (address != NULL) {
586 return "The interface can't be set when using socket activation";
587 }
588
589 if (port != NULL) {
590 return "TCP port number can't be set when using socket activation";
591 }
592
593 if (list) {
594 return "List mode is incompatible with socket activation";
595 }
596
597 return NULL;
598 }
599
600 static void qemu_nbd_shutdown(void)
601 {
602 job_cancel_sync_all();
603 bdrv_close_all();
604 }
605
606 int main(int argc, char **argv)
607 {
608 BlockBackend *blk;
609 BlockDriverState *bs;
610 uint64_t dev_offset = 0;
611 uint16_t nbdflags = 0;
612 bool disconnect = false;
613 const char *bindto = NULL;
614 const char *port = NULL;
615 char *sockpath = NULL;
616 char *device = NULL;
617 int64_t fd_size;
618 QemuOpts *sn_opts = NULL;
619 const char *sn_id_or_name = NULL;
620 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L";
621 struct option lopt[] = {
622 { "help", no_argument, NULL, 'h' },
623 { "version", no_argument, NULL, 'V' },
624 { "bind", required_argument, NULL, 'b' },
625 { "port", required_argument, NULL, 'p' },
626 { "socket", required_argument, NULL, 'k' },
627 { "offset", required_argument, NULL, 'o' },
628 { "read-only", no_argument, NULL, 'r' },
629 { "partition", required_argument, NULL, 'P' },
630 { "bitmap", required_argument, NULL, 'B' },
631 { "connect", required_argument, NULL, 'c' },
632 { "disconnect", no_argument, NULL, 'd' },
633 { "list", no_argument, NULL, 'L' },
634 { "snapshot", no_argument, NULL, 's' },
635 { "load-snapshot", required_argument, NULL, 'l' },
636 { "nocache", no_argument, NULL, 'n' },
637 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
638 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
639 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
640 { "detect-zeroes", required_argument, NULL,
641 QEMU_NBD_OPT_DETECT_ZEROES },
642 { "shared", required_argument, NULL, 'e' },
643 { "format", required_argument, NULL, 'f' },
644 { "persistent", no_argument, NULL, 't' },
645 { "verbose", no_argument, NULL, 'v' },
646 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
647 { "export-name", required_argument, NULL, 'x' },
648 { "description", required_argument, NULL, 'D' },
649 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
650 { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ },
651 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
652 { "trace", required_argument, NULL, 'T' },
653 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
654 { NULL, 0, NULL, 0 }
655 };
656 int ch;
657 int opt_ind = 0;
658 int flags = BDRV_O_RDWR;
659 int partition = 0;
660 int ret = 0;
661 bool seen_cache = false;
662 bool seen_discard = false;
663 bool seen_aio = false;
664 pthread_t client_thread;
665 const char *fmt = NULL;
666 Error *local_err = NULL;
667 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
668 QDict *options = NULL;
669 const char *export_name = NULL; /* defaults to "" later for server mode */
670 const char *export_description = NULL;
671 const char *bitmap = NULL;
672 const char *tlscredsid = NULL;
673 bool imageOpts = false;
674 bool writethrough = true;
675 char *trace_file = NULL;
676 bool fork_process = false;
677 bool list = false;
678 int old_stderr = -1;
679 unsigned socket_activation;
680
681 /* The client thread uses SIGTERM to interrupt the server. A signal
682 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
683 */
684 struct sigaction sa_sigterm;
685 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
686 sa_sigterm.sa_handler = termsig_handler;
687 sigaction(SIGTERM, &sa_sigterm, NULL);
688
689 #ifdef CONFIG_POSIX
690 signal(SIGPIPE, SIG_IGN);
691 #endif
692
693 module_call_init(MODULE_INIT_TRACE);
694 error_set_progname(argv[0]);
695 qcrypto_init(&error_fatal);
696
697 module_call_init(MODULE_INIT_QOM);
698 qemu_add_opts(&qemu_object_opts);
699 qemu_add_opts(&qemu_trace_opts);
700 qemu_init_exec_dir(argv[0]);
701
702 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
703 switch (ch) {
704 case 's':
705 flags |= BDRV_O_SNAPSHOT;
706 break;
707 case 'n':
708 optarg = (char *) "none";
709 /* fallthrough */
710 case QEMU_NBD_OPT_CACHE:
711 if (seen_cache) {
712 error_report("-n and --cache can only be specified once");
713 exit(EXIT_FAILURE);
714 }
715 seen_cache = true;
716 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
717 error_report("Invalid cache mode `%s'", optarg);
718 exit(EXIT_FAILURE);
719 }
720 break;
721 case QEMU_NBD_OPT_AIO:
722 if (seen_aio) {
723 error_report("--aio can only be specified once");
724 exit(EXIT_FAILURE);
725 }
726 seen_aio = true;
727 if (!strcmp(optarg, "native")) {
728 flags |= BDRV_O_NATIVE_AIO;
729 } else if (!strcmp(optarg, "threads")) {
730 /* this is the default */
731 } else {
732 error_report("invalid aio mode `%s'", optarg);
733 exit(EXIT_FAILURE);
734 }
735 break;
736 case QEMU_NBD_OPT_DISCARD:
737 if (seen_discard) {
738 error_report("--discard can only be specified once");
739 exit(EXIT_FAILURE);
740 }
741 seen_discard = true;
742 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
743 error_report("Invalid discard mode `%s'", optarg);
744 exit(EXIT_FAILURE);
745 }
746 break;
747 case QEMU_NBD_OPT_DETECT_ZEROES:
748 detect_zeroes =
749 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
750 optarg,
751 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
752 &local_err);
753 if (local_err) {
754 error_reportf_err(local_err,
755 "Failed to parse detect_zeroes mode: ");
756 exit(EXIT_FAILURE);
757 }
758 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
759 !(flags & BDRV_O_UNMAP)) {
760 error_report("setting detect-zeroes to unmap is not allowed "
761 "without setting discard operation to unmap");
762 exit(EXIT_FAILURE);
763 }
764 break;
765 case 'b':
766 bindto = optarg;
767 break;
768 case 'p':
769 port = optarg;
770 break;
771 case 'o':
772 if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
773 error_report("Invalid offset '%s'", optarg);
774 exit(EXIT_FAILURE);
775 }
776 break;
777 case 'l':
778 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
779 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
780 optarg, false);
781 if (!sn_opts) {
782 error_report("Failed in parsing snapshot param `%s'",
783 optarg);
784 exit(EXIT_FAILURE);
785 }
786 } else {
787 sn_id_or_name = optarg;
788 }
789 /* fall through */
790 case 'r':
791 nbdflags |= NBD_FLAG_READ_ONLY;
792 flags &= ~BDRV_O_RDWR;
793 break;
794 case 'P':
795 warn_report("The '-P' option is deprecated; use --image-opts with "
796 "a raw device wrapper for subset exports instead");
797 if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 ||
798 partition < 1 || partition > 8) {
799 error_report("Invalid partition '%s'", optarg);
800 exit(EXIT_FAILURE);
801 }
802 break;
803 case 'B':
804 bitmap = optarg;
805 break;
806 case 'k':
807 sockpath = optarg;
808 if (sockpath[0] != '/') {
809 error_report("socket path must be absolute");
810 exit(EXIT_FAILURE);
811 }
812 break;
813 case 'd':
814 disconnect = true;
815 break;
816 case 'c':
817 device = optarg;
818 break;
819 case 'e':
820 if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
821 shared < 1) {
822 error_report("Invalid shared device number '%s'", optarg);
823 exit(EXIT_FAILURE);
824 }
825 break;
826 case 'f':
827 fmt = optarg;
828 break;
829 case 't':
830 persistent = 1;
831 break;
832 case 'x':
833 export_name = optarg;
834 break;
835 case 'D':
836 export_description = optarg;
837 break;
838 case 'v':
839 verbose = 1;
840 break;
841 case 'V':
842 version(argv[0]);
843 exit(0);
844 break;
845 case 'h':
846 usage(argv[0]);
847 exit(0);
848 break;
849 case '?':
850 error_report("Try `%s --help' for more information.", argv[0]);
851 exit(EXIT_FAILURE);
852 case QEMU_NBD_OPT_OBJECT: {
853 QemuOpts *opts;
854 opts = qemu_opts_parse_noisily(&qemu_object_opts,
855 optarg, true);
856 if (!opts) {
857 exit(EXIT_FAILURE);
858 }
859 } break;
860 case QEMU_NBD_OPT_TLSCREDS:
861 tlscredsid = optarg;
862 break;
863 case QEMU_NBD_OPT_IMAGE_OPTS:
864 imageOpts = true;
865 break;
866 case 'T':
867 g_free(trace_file);
868 trace_file = trace_opt_parse(optarg);
869 break;
870 case QEMU_NBD_OPT_TLSAUTHZ:
871 tlsauthz = optarg;
872 break;
873 case QEMU_NBD_OPT_FORK:
874 fork_process = true;
875 break;
876 case 'L':
877 list = true;
878 break;
879 }
880 }
881
882 if (list) {
883 if (argc != optind) {
884 error_report("List mode is incompatible with a file name");
885 exit(EXIT_FAILURE);
886 }
887 if (export_name || export_description || dev_offset || partition ||
888 device || disconnect || fmt || sn_id_or_name || bitmap ||
889 seen_aio || seen_discard || seen_cache) {
890 error_report("List mode is incompatible with per-device settings");
891 exit(EXIT_FAILURE);
892 }
893 if (fork_process) {
894 error_report("List mode is incompatible with forking");
895 exit(EXIT_FAILURE);
896 }
897 } else if ((argc - optind) != 1) {
898 error_report("Invalid number of arguments");
899 error_printf("Try `%s --help' for more information.\n", argv[0]);
900 exit(EXIT_FAILURE);
901 } else if (!export_name) {
902 export_name = "";
903 }
904
905 qemu_opts_foreach(&qemu_object_opts,
906 user_creatable_add_opts_foreach,
907 NULL, &error_fatal);
908
909 if (!trace_init_backends()) {
910 exit(1);
911 }
912 trace_init_file(trace_file);
913 qemu_set_log(LOG_TRACE);
914
915 socket_activation = check_socket_activation();
916 if (socket_activation == 0) {
917 setup_address_and_port(&bindto, &port);
918 } else {
919 /* Using socket activation - check user didn't use -p etc. */
920 const char *err_msg = socket_activation_validate_opts(device, sockpath,
921 bindto, port,
922 list);
923 if (err_msg != NULL) {
924 error_report("%s", err_msg);
925 exit(EXIT_FAILURE);
926 }
927
928 /* qemu-nbd can only listen on a single socket. */
929 if (socket_activation > 1) {
930 error_report("qemu-nbd does not support socket activation with %s > 1",
931 "LISTEN_FDS");
932 exit(EXIT_FAILURE);
933 }
934 }
935
936 if (tlscredsid) {
937 if (sockpath) {
938 error_report("TLS is only supported with IPv4/IPv6");
939 exit(EXIT_FAILURE);
940 }
941 if (device) {
942 error_report("TLS is not supported with a host device");
943 exit(EXIT_FAILURE);
944 }
945 if (tlsauthz && list) {
946 error_report("TLS authorization is incompatible with export list");
947 exit(EXIT_FAILURE);
948 }
949 tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err);
950 if (local_err) {
951 error_report("Failed to get TLS creds %s",
952 error_get_pretty(local_err));
953 exit(EXIT_FAILURE);
954 }
955 } else {
956 if (tlsauthz) {
957 error_report("--tls-authz is not permitted without --tls-creds");
958 exit(EXIT_FAILURE);
959 }
960 }
961
962 if (list) {
963 saddr = nbd_build_socket_address(sockpath, bindto, port);
964 return qemu_nbd_client_list(saddr, tlscreds, bindto);
965 }
966
967 #if !HAVE_NBD_DEVICE
968 if (disconnect || device) {
969 error_report("Kernel /dev/nbdN support not available");
970 exit(EXIT_FAILURE);
971 }
972 #else /* HAVE_NBD_DEVICE */
973 if (disconnect) {
974 int nbdfd = open(argv[optind], O_RDWR);
975 if (nbdfd < 0) {
976 error_report("Cannot open %s: %s", argv[optind],
977 strerror(errno));
978 exit(EXIT_FAILURE);
979 }
980 nbd_disconnect(nbdfd);
981
982 close(nbdfd);
983
984 printf("%s disconnected\n", argv[optind]);
985
986 return 0;
987 }
988 #endif
989
990 if ((device && !verbose) || fork_process) {
991 int stderr_fd[2];
992 pid_t pid;
993 int ret;
994
995 if (qemu_pipe(stderr_fd) < 0) {
996 error_report("Error setting up communication pipe: %s",
997 strerror(errno));
998 exit(EXIT_FAILURE);
999 }
1000
1001 /* Now daemonize, but keep a communication channel open to
1002 * print errors and exit with the proper status code.
1003 */
1004 pid = fork();
1005 if (pid < 0) {
1006 error_report("Failed to fork: %s", strerror(errno));
1007 exit(EXIT_FAILURE);
1008 } else if (pid == 0) {
1009 close(stderr_fd[0]);
1010 ret = qemu_daemon(1, 0);
1011
1012 /* Temporarily redirect stderr to the parent's pipe... */
1013 old_stderr = dup(STDERR_FILENO);
1014 dup2(stderr_fd[1], STDERR_FILENO);
1015 if (ret < 0) {
1016 error_report("Failed to daemonize: %s", strerror(errno));
1017 exit(EXIT_FAILURE);
1018 }
1019
1020 /* ... close the descriptor we inherited and go on. */
1021 close(stderr_fd[1]);
1022 } else {
1023 bool errors = false;
1024 char *buf;
1025
1026 /* In the parent. Print error messages from the child until
1027 * it closes the pipe.
1028 */
1029 close(stderr_fd[1]);
1030 buf = g_malloc(1024);
1031 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
1032 errors = true;
1033 ret = qemu_write_full(STDERR_FILENO, buf, ret);
1034 if (ret < 0) {
1035 exit(EXIT_FAILURE);
1036 }
1037 }
1038 if (ret < 0) {
1039 error_report("Cannot read from daemon: %s",
1040 strerror(errno));
1041 exit(EXIT_FAILURE);
1042 }
1043
1044 /* Usually the daemon should not print any message.
1045 * Exit with zero status in that case.
1046 */
1047 exit(errors);
1048 }
1049 }
1050
1051 if (device != NULL && sockpath == NULL) {
1052 sockpath = g_malloc(128);
1053 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
1054 }
1055
1056 server = qio_net_listener_new();
1057 if (socket_activation == 0) {
1058 saddr = nbd_build_socket_address(sockpath, bindto, port);
1059 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) {
1060 object_unref(OBJECT(server));
1061 error_report_err(local_err);
1062 exit(EXIT_FAILURE);
1063 }
1064 } else {
1065 size_t i;
1066 /* See comment in check_socket_activation above. */
1067 for (i = 0; i < socket_activation; i++) {
1068 QIOChannelSocket *sioc;
1069 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
1070 &local_err);
1071 if (sioc == NULL) {
1072 object_unref(OBJECT(server));
1073 error_report("Failed to use socket activation: %s",
1074 error_get_pretty(local_err));
1075 exit(EXIT_FAILURE);
1076 }
1077 qio_net_listener_add(server, sioc);
1078 object_unref(OBJECT(sioc));
1079 }
1080 }
1081
1082 if (qemu_init_main_loop(&local_err)) {
1083 error_report_err(local_err);
1084 exit(EXIT_FAILURE);
1085 }
1086 bdrv_init();
1087 atexit(qemu_nbd_shutdown);
1088
1089 srcpath = argv[optind];
1090 if (imageOpts) {
1091 QemuOpts *opts;
1092 if (fmt) {
1093 error_report("--image-opts and -f are mutually exclusive");
1094 exit(EXIT_FAILURE);
1095 }
1096 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
1097 if (!opts) {
1098 qemu_opts_reset(&file_opts);
1099 exit(EXIT_FAILURE);
1100 }
1101 options = qemu_opts_to_qdict(opts, NULL);
1102 qemu_opts_reset(&file_opts);
1103 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
1104 } else {
1105 if (fmt) {
1106 options = qdict_new();
1107 qdict_put_str(options, "driver", fmt);
1108 }
1109 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
1110 }
1111
1112 if (!blk) {
1113 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
1114 argv[optind]);
1115 exit(EXIT_FAILURE);
1116 }
1117 bs = blk_bs(blk);
1118
1119 blk_set_enable_write_cache(blk, !writethrough);
1120
1121 if (sn_opts) {
1122 ret = bdrv_snapshot_load_tmp(bs,
1123 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1124 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1125 &local_err);
1126 } else if (sn_id_or_name) {
1127 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
1128 &local_err);
1129 }
1130 if (ret < 0) {
1131 error_reportf_err(local_err, "Failed to load snapshot: ");
1132 exit(EXIT_FAILURE);
1133 }
1134
1135 bs->detect_zeroes = detect_zeroes;
1136 fd_size = blk_getlength(blk);
1137 if (fd_size < 0) {
1138 error_report("Failed to determine the image length: %s",
1139 strerror(-fd_size));
1140 exit(EXIT_FAILURE);
1141 }
1142
1143 if (dev_offset >= fd_size) {
1144 error_report("Offset (%" PRIu64 ") has to be smaller than the image "
1145 "size (%" PRId64 ")", dev_offset, fd_size);
1146 exit(EXIT_FAILURE);
1147 }
1148 fd_size -= dev_offset;
1149
1150 if (partition) {
1151 uint64_t limit;
1152
1153 if (dev_offset) {
1154 error_report("Cannot request partition and offset together");
1155 exit(EXIT_FAILURE);
1156 }
1157 ret = find_partition(blk, partition, &dev_offset, &limit);
1158 if (ret < 0) {
1159 error_report("Could not find partition %d: %s", partition,
1160 strerror(-ret));
1161 exit(EXIT_FAILURE);
1162 }
1163 /*
1164 * MBR partition limits are (32-bit << 9); this assert lets
1165 * the compiler know that we can't overflow 64 bits.
1166 */
1167 assert(dev_offset + limit >= dev_offset);
1168 if (dev_offset + limit > fd_size) {
1169 error_report("Discovered partition %d at offset %" PRIu64
1170 " size %" PRIu64 ", but size exceeds file length %"
1171 PRId64, partition, dev_offset, limit, fd_size);
1172 exit(EXIT_FAILURE);
1173 }
1174 fd_size = limit;
1175 }
1176
1177 export = nbd_export_new(bs, dev_offset, fd_size, export_name,
1178 export_description, bitmap, nbdflags,
1179 nbd_export_closed, writethrough, NULL,
1180 &error_fatal);
1181
1182 if (device) {
1183 #if HAVE_NBD_DEVICE
1184 int ret;
1185
1186 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1187 if (ret != 0) {
1188 error_report("Failed to create client thread: %s", strerror(ret));
1189 exit(EXIT_FAILURE);
1190 }
1191 #endif
1192 } else {
1193 /* Shut up GCC warnings. */
1194 memset(&client_thread, 0, sizeof(client_thread));
1195 }
1196
1197 nbd_update_server_watch();
1198
1199 /* now when the initialization is (almost) complete, chdir("/")
1200 * to free any busy filesystems */
1201 if (chdir("/") < 0) {
1202 error_report("Could not chdir to root directory: %s",
1203 strerror(errno));
1204 exit(EXIT_FAILURE);
1205 }
1206
1207 if (fork_process) {
1208 dup2(old_stderr, STDERR_FILENO);
1209 close(old_stderr);
1210 }
1211
1212 state = RUNNING;
1213 do {
1214 main_loop_wait(false);
1215 if (state == TERMINATE) {
1216 state = TERMINATING;
1217 nbd_export_close(export);
1218 nbd_export_put(export);
1219 export = NULL;
1220 }
1221 } while (state != TERMINATED);
1222
1223 blk_unref(blk);
1224 if (sockpath) {
1225 unlink(sockpath);
1226 }
1227
1228 qemu_opts_del(sn_opts);
1229
1230 if (device) {
1231 void *ret;
1232 pthread_join(client_thread, &ret);
1233 exit(ret != NULL);
1234 } else {
1235 exit(EXIT_SUCCESS);
1236 }
1237 }
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