vhost: use QEMU_ALIGN_DOWN
[qemu/ar7.git] / qemu-nbd.c
blob27164b8205e0fe10136d8f4fa2c3cff72106f9ac
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
4 * Network Block Device
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.
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.
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/>.
19 #include "qemu/osdep.h"
20 #include <getopt.h>
21 #include <libgen.h>
22 #include <pthread.h>
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/util.h"
38 #include "qapi/qmp/qstring.h"
39 #include "qom/object_interfaces.h"
40 #include "io/channel-socket.h"
41 #include "crypto/init.h"
42 #include "trace/control.h"
43 #include "qemu-version.h"
45 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
46 #define QEMU_NBD_OPT_CACHE 256
47 #define QEMU_NBD_OPT_AIO 257
48 #define QEMU_NBD_OPT_DISCARD 258
49 #define QEMU_NBD_OPT_DETECT_ZEROES 259
50 #define QEMU_NBD_OPT_OBJECT 260
51 #define QEMU_NBD_OPT_TLSCREDS 261
52 #define QEMU_NBD_OPT_IMAGE_OPTS 262
53 #define QEMU_NBD_OPT_FORK 263
55 #define MBR_SIZE 512
57 static NBDExport *exp;
58 static bool newproto;
59 static int verbose;
60 static char *srcpath;
61 static SocketAddress *saddr;
62 static int persistent = 0;
63 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
64 static int shared = 1;
65 static int nb_fds;
66 static QIOChannelSocket *server_ioc;
67 static int server_watch = -1;
68 static QCryptoTLSCreds *tlscreds;
70 static void usage(const char *name)
72 (printf) (
73 "Usage: %s [OPTIONS] FILE\n"
74 "QEMU Disk Network Block Device Server\n"
75 "\n"
76 " -h, --help display this help and exit\n"
77 " -V, --version output version information and exit\n"
78 "\n"
79 "Connection properties:\n"
80 " -p, --port=PORT port to listen on (default `%d')\n"
81 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
82 " -k, --socket=PATH path to the unix socket\n"
83 " (default '"SOCKET_PATH"')\n"
84 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
85 " -t, --persistent don't exit on the last connection\n"
86 " -v, --verbose display extra debugging information\n"
87 " -x, --export-name=NAME expose export by name\n"
88 " -D, --description=TEXT with -x, also export a human-readable description\n"
89 "\n"
90 "Exposing part of the image:\n"
91 " -o, --offset=OFFSET offset into the image\n"
92 " -P, --partition=NUM only expose partition NUM\n"
93 "\n"
94 "General purpose options:\n"
95 " --object type,id=ID,... define an object such as 'secret' for providing\n"
96 " passwords and/or encryption keys\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"
126 QEMU_HELP_BOTTOM "\n"
127 , name, NBD_DEFAULT_PORT, "DEVICE");
130 static void version(const char *name)
132 printf(
133 "%s " QEMU_VERSION QEMU_PKGVERSION "\n"
134 "Written by Anthony Liguori.\n"
135 "\n"
136 QEMU_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);
142 struct partition_record
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;
156 static void read_partition(uint8_t *p, struct partition_record *r)
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;
167 r->start_sector_abs = ldl_le_p(p + 8);
168 r->nb_sectors_abs = ldl_le_p(p + 12);
171 static int find_partition(BlockBackend *blk, int partition,
172 off_t *offset, off_t *size)
174 struct partition_record mbr[4];
175 uint8_t data[MBR_SIZE];
176 int i;
177 int ext_partnum = 4;
178 int ret;
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);
186 if (data[510] != 0x55 || data[511] != 0xaa) {
187 return -EINVAL;
190 for (i = 0; i < 4; i++) {
191 read_partition(&data[446 + 16 * i], &mbr[i]);
193 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
194 continue;
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;
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);
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;
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;
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;
229 return -ENOENT;
232 static void termsig_handler(int signum)
234 atomic_cmpxchg(&state, RUNNING, TERMINATE);
235 qemu_notify_event();
239 static void *show_parts(void *arg)
241 char *device = arg;
242 int nbd;
244 /* linux just needs an open() to trigger
245 * the partition table update
246 * but remember to load the module with max_part != 0 :
247 * modprobe nbd max_part=63
249 nbd = open(device, O_RDWR);
250 if (nbd >= 0) {
251 close(nbd);
253 return NULL;
256 static void *nbd_client_thread(void *arg)
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;
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;
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);
280 goto out_socket;
283 fd = open(device, O_RDWR);
284 if (fd < 0) {
285 /* Linux-only, we can use %m in printf. */
286 error_report("Failed to open %s: %m", device);
287 goto out_socket;
290 ret = nbd_init(fd, sioc, &info, &local_error);
291 if (ret < 0) {
292 error_report_err(local_error);
293 goto out_fd;
296 /* update partition table */
297 pthread_create(&show_parts_thread, NULL, show_parts, device);
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);
307 ret = nbd_client(fd);
308 if (ret) {
309 goto out_fd;
311 close(fd);
312 object_unref(OBJECT(sioc));
313 kill(getpid(), SIGTERM);
314 return (void *) EXIT_SUCCESS;
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;
325 static int nbd_can_accept(void)
327 return state == RUNNING && nb_fds < shared;
330 static void nbd_export_closed(NBDExport *exp)
332 assert(state == TERMINATING);
333 state = TERMINATED;
336 static void nbd_update_server_watch(void);
338 static void nbd_client_closed(NBDClient *client, bool negotiated)
340 nb_fds--;
341 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
342 state = TERMINATE;
344 nbd_update_server_watch();
345 nbd_client_put(client);
348 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
350 QIOChannelSocket *cioc;
352 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
353 NULL);
354 if (!cioc) {
355 return TRUE;
358 if (state >= TERMINATE) {
359 object_unref(OBJECT(cioc));
360 return TRUE;
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));
369 return TRUE;
372 static void nbd_update_server_watch(void)
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);
381 } else {
382 if (server_watch != -1) {
383 g_source_remove(server_watch);
384 server_watch = -1;
390 static SocketAddress *nbd_build_socket_address(const char *sockpath,
391 const char *bindto,
392 const char *port)
394 SocketAddress *saddr;
396 saddr = g_new0(SocketAddress, 1);
397 if (sockpath) {
398 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
399 saddr->u.q_unix.path = g_strdup(sockpath);
400 } else {
401 InetSocketAddress *inet;
402 saddr->type = SOCKET_ADDRESS_TYPE_INET;
403 inet = &saddr->u.inet;
404 inet->host = g_strdup(bindto);
405 if (port) {
406 inet->port = g_strdup(port);
407 } else {
408 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
412 return saddr;
416 static QemuOptsList file_opts = {
417 .name = "file",
418 .implied_opt_name = "file",
419 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
420 .desc = {
421 /* no elements => accept any params */
422 { /* end of list */ }
426 static QemuOptsList qemu_object_opts = {
427 .name = "object",
428 .implied_opt_name = "qom-type",
429 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
430 .desc = {
437 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
439 Object *obj;
440 QCryptoTLSCreds *creds;
442 obj = object_resolve_path_component(
443 object_get_objects_root(), id);
444 if (!obj) {
445 error_setg(errp, "No TLS credentials with id '%s'",
446 id);
447 return NULL;
449 creds = (QCryptoTLSCreds *)
450 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
451 if (!creds) {
452 error_setg(errp, "Object with id '%s' is not TLS credentials",
453 id);
454 return NULL;
457 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
458 error_setg(errp,
459 "Expecting TLS credentials with a server endpoint");
460 return NULL;
462 object_ref(obj);
463 return creds;
466 static void setup_address_and_port(const char **address, const char **port)
468 if (*address == NULL) {
469 *address = "0.0.0.0";
472 if (*port == NULL) {
473 *port = stringify(NBD_DEFAULT_PORT);
478 * Check socket parameters compatibility when socket activation is used.
480 static const char *socket_activation_validate_opts(const char *device,
481 const char *sockpath,
482 const char *address,
483 const char *port)
485 if (device != NULL) {
486 return "NBD device can't be set when using socket activation";
489 if (sockpath != NULL) {
490 return "Unix socket can't be set when using socket activation";
493 if (address != NULL) {
494 return "The interface can't be set when using socket activation";
497 if (port != NULL) {
498 return "TCP port number can't be set when using socket activation";
501 return NULL;
504 int main(int argc, char **argv)
506 BlockBackend *blk;
507 BlockDriverState *bs;
508 off_t dev_offset = 0;
509 uint16_t nbdflags = 0;
510 bool disconnect = false;
511 const char *bindto = NULL;
512 const char *port = NULL;
513 char *sockpath = NULL;
514 char *device = NULL;
515 off_t fd_size;
516 QemuOpts *sn_opts = NULL;
517 const char *sn_id_or_name = NULL;
518 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
519 struct option lopt[] = {
520 { "help", no_argument, NULL, 'h' },
521 { "version", no_argument, NULL, 'V' },
522 { "bind", required_argument, NULL, 'b' },
523 { "port", required_argument, NULL, 'p' },
524 { "socket", required_argument, NULL, 'k' },
525 { "offset", required_argument, NULL, 'o' },
526 { "read-only", no_argument, NULL, 'r' },
527 { "partition", required_argument, NULL, 'P' },
528 { "connect", required_argument, NULL, 'c' },
529 { "disconnect", no_argument, NULL, 'd' },
530 { "snapshot", no_argument, NULL, 's' },
531 { "load-snapshot", required_argument, NULL, 'l' },
532 { "nocache", no_argument, NULL, 'n' },
533 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
534 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
535 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
536 { "detect-zeroes", required_argument, NULL,
537 QEMU_NBD_OPT_DETECT_ZEROES },
538 { "shared", required_argument, NULL, 'e' },
539 { "format", required_argument, NULL, 'f' },
540 { "persistent", no_argument, NULL, 't' },
541 { "verbose", no_argument, NULL, 'v' },
542 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
543 { "export-name", required_argument, NULL, 'x' },
544 { "description", required_argument, NULL, 'D' },
545 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
546 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
547 { "trace", required_argument, NULL, 'T' },
548 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
549 { NULL, 0, NULL, 0 }
551 int ch;
552 int opt_ind = 0;
553 char *end;
554 int flags = BDRV_O_RDWR;
555 int partition = -1;
556 int ret = 0;
557 bool seen_cache = false;
558 bool seen_discard = false;
559 bool seen_aio = false;
560 pthread_t client_thread;
561 const char *fmt = NULL;
562 Error *local_err = NULL;
563 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
564 QDict *options = NULL;
565 const char *export_name = NULL;
566 const char *export_description = NULL;
567 const char *tlscredsid = NULL;
568 bool imageOpts = false;
569 bool writethrough = true;
570 char *trace_file = NULL;
571 bool fork_process = false;
572 int old_stderr = -1;
573 unsigned socket_activation;
575 /* The client thread uses SIGTERM to interrupt the server. A signal
576 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
578 struct sigaction sa_sigterm;
579 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
580 sa_sigterm.sa_handler = termsig_handler;
581 sigaction(SIGTERM, &sa_sigterm, NULL);
583 #ifdef CONFIG_POSIX
584 signal(SIGPIPE, SIG_IGN);
585 #endif
587 module_call_init(MODULE_INIT_TRACE);
588 qcrypto_init(&error_fatal);
590 module_call_init(MODULE_INIT_QOM);
591 qemu_add_opts(&qemu_object_opts);
592 qemu_add_opts(&qemu_trace_opts);
593 qemu_init_exec_dir(argv[0]);
595 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
596 switch (ch) {
597 case 's':
598 flags |= BDRV_O_SNAPSHOT;
599 break;
600 case 'n':
601 optarg = (char *) "none";
602 /* fallthrough */
603 case QEMU_NBD_OPT_CACHE:
604 if (seen_cache) {
605 error_report("-n and --cache can only be specified once");
606 exit(EXIT_FAILURE);
608 seen_cache = true;
609 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
610 error_report("Invalid cache mode `%s'", optarg);
611 exit(EXIT_FAILURE);
613 break;
614 case QEMU_NBD_OPT_AIO:
615 if (seen_aio) {
616 error_report("--aio can only be specified once");
617 exit(EXIT_FAILURE);
619 seen_aio = true;
620 if (!strcmp(optarg, "native")) {
621 flags |= BDRV_O_NATIVE_AIO;
622 } else if (!strcmp(optarg, "threads")) {
623 /* this is the default */
624 } else {
625 error_report("invalid aio mode `%s'", optarg);
626 exit(EXIT_FAILURE);
628 break;
629 case QEMU_NBD_OPT_DISCARD:
630 if (seen_discard) {
631 error_report("--discard can only be specified once");
632 exit(EXIT_FAILURE);
634 seen_discard = true;
635 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
636 error_report("Invalid discard mode `%s'", optarg);
637 exit(EXIT_FAILURE);
639 break;
640 case QEMU_NBD_OPT_DETECT_ZEROES:
641 detect_zeroes =
642 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
643 optarg,
644 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
645 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
646 &local_err);
647 if (local_err) {
648 error_reportf_err(local_err,
649 "Failed to parse detect_zeroes mode: ");
650 exit(EXIT_FAILURE);
652 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
653 !(flags & BDRV_O_UNMAP)) {
654 error_report("setting detect-zeroes to unmap is not allowed "
655 "without setting discard operation to unmap");
656 exit(EXIT_FAILURE);
658 break;
659 case 'b':
660 bindto = optarg;
661 break;
662 case 'p':
663 port = optarg;
664 break;
665 case 'o':
666 dev_offset = strtoll (optarg, &end, 0);
667 if (*end) {
668 error_report("Invalid offset `%s'", optarg);
669 exit(EXIT_FAILURE);
671 if (dev_offset < 0) {
672 error_report("Offset must be positive `%s'", optarg);
673 exit(EXIT_FAILURE);
675 break;
676 case 'l':
677 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
678 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
679 optarg, false);
680 if (!sn_opts) {
681 error_report("Failed in parsing snapshot param `%s'",
682 optarg);
683 exit(EXIT_FAILURE);
685 } else {
686 sn_id_or_name = optarg;
688 /* fall through */
689 case 'r':
690 nbdflags |= NBD_FLAG_READ_ONLY;
691 flags &= ~BDRV_O_RDWR;
692 break;
693 case 'P':
694 partition = strtol(optarg, &end, 0);
695 if (*end) {
696 error_report("Invalid partition `%s'", optarg);
697 exit(EXIT_FAILURE);
699 if (partition < 1 || partition > 8) {
700 error_report("Invalid partition %d", partition);
701 exit(EXIT_FAILURE);
703 break;
704 case 'k':
705 sockpath = optarg;
706 if (sockpath[0] != '/') {
707 error_report("socket path must be absolute");
708 exit(EXIT_FAILURE);
710 break;
711 case 'd':
712 disconnect = true;
713 break;
714 case 'c':
715 device = optarg;
716 break;
717 case 'e':
718 shared = strtol(optarg, &end, 0);
719 if (*end) {
720 error_report("Invalid shared device number '%s'", optarg);
721 exit(EXIT_FAILURE);
723 if (shared < 1) {
724 error_report("Shared device number must be greater than 0");
725 exit(EXIT_FAILURE);
727 break;
728 case 'f':
729 fmt = optarg;
730 break;
731 case 't':
732 persistent = 1;
733 break;
734 case 'x':
735 export_name = optarg;
736 break;
737 case 'D':
738 export_description = optarg;
739 break;
740 case 'v':
741 verbose = 1;
742 break;
743 case 'V':
744 version(argv[0]);
745 exit(0);
746 break;
747 case 'h':
748 usage(argv[0]);
749 exit(0);
750 break;
751 case '?':
752 error_report("Try `%s --help' for more information.", argv[0]);
753 exit(EXIT_FAILURE);
754 case QEMU_NBD_OPT_OBJECT: {
755 QemuOpts *opts;
756 opts = qemu_opts_parse_noisily(&qemu_object_opts,
757 optarg, true);
758 if (!opts) {
759 exit(EXIT_FAILURE);
761 } break;
762 case QEMU_NBD_OPT_TLSCREDS:
763 tlscredsid = optarg;
764 break;
765 case QEMU_NBD_OPT_IMAGE_OPTS:
766 imageOpts = true;
767 break;
768 case 'T':
769 g_free(trace_file);
770 trace_file = trace_opt_parse(optarg);
771 break;
772 case QEMU_NBD_OPT_FORK:
773 fork_process = true;
774 break;
778 if ((argc - optind) != 1) {
779 error_report("Invalid number of arguments");
780 error_printf("Try `%s --help' for more information.\n", argv[0]);
781 exit(EXIT_FAILURE);
784 if (qemu_opts_foreach(&qemu_object_opts,
785 user_creatable_add_opts_foreach,
786 NULL, NULL)) {
787 exit(EXIT_FAILURE);
790 if (!trace_init_backends()) {
791 exit(1);
793 trace_init_file(trace_file);
794 qemu_set_log(LOG_TRACE);
796 socket_activation = check_socket_activation();
797 if (socket_activation == 0) {
798 setup_address_and_port(&bindto, &port);
799 } else {
800 /* Using socket activation - check user didn't use -p etc. */
801 const char *err_msg = socket_activation_validate_opts(device, sockpath,
802 bindto, port);
803 if (err_msg != NULL) {
804 error_report("%s", err_msg);
805 exit(EXIT_FAILURE);
808 /* qemu-nbd can only listen on a single socket. */
809 if (socket_activation > 1) {
810 error_report("qemu-nbd does not support socket activation with %s > 1",
811 "LISTEN_FDS");
812 exit(EXIT_FAILURE);
816 if (tlscredsid) {
817 if (sockpath) {
818 error_report("TLS is only supported with IPv4/IPv6");
819 exit(EXIT_FAILURE);
821 if (device) {
822 error_report("TLS is not supported with a host device");
823 exit(EXIT_FAILURE);
825 if (!export_name) {
826 /* Set the default NBD protocol export name, since
827 * we *must* use new style protocol for TLS */
828 export_name = "";
830 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
831 if (local_err) {
832 error_report("Failed to get TLS creds %s",
833 error_get_pretty(local_err));
834 exit(EXIT_FAILURE);
838 if (disconnect) {
839 int nbdfd = open(argv[optind], O_RDWR);
840 if (nbdfd < 0) {
841 error_report("Cannot open %s: %s", argv[optind],
842 strerror(errno));
843 exit(EXIT_FAILURE);
845 nbd_disconnect(nbdfd);
847 close(nbdfd);
849 printf("%s disconnected\n", argv[optind]);
851 return 0;
854 if ((device && !verbose) || fork_process) {
855 int stderr_fd[2];
856 pid_t pid;
857 int ret;
859 if (qemu_pipe(stderr_fd) < 0) {
860 error_report("Error setting up communication pipe: %s",
861 strerror(errno));
862 exit(EXIT_FAILURE);
865 /* Now daemonize, but keep a communication channel open to
866 * print errors and exit with the proper status code.
868 pid = fork();
869 if (pid < 0) {
870 error_report("Failed to fork: %s", strerror(errno));
871 exit(EXIT_FAILURE);
872 } else if (pid == 0) {
873 close(stderr_fd[0]);
874 ret = qemu_daemon(1, 0);
876 /* Temporarily redirect stderr to the parent's pipe... */
877 old_stderr = dup(STDERR_FILENO);
878 dup2(stderr_fd[1], STDERR_FILENO);
879 if (ret < 0) {
880 error_report("Failed to daemonize: %s", strerror(errno));
881 exit(EXIT_FAILURE);
884 /* ... close the descriptor we inherited and go on. */
885 close(stderr_fd[1]);
886 } else {
887 bool errors = false;
888 char *buf;
890 /* In the parent. Print error messages from the child until
891 * it closes the pipe.
893 close(stderr_fd[1]);
894 buf = g_malloc(1024);
895 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
896 errors = true;
897 ret = qemu_write_full(STDERR_FILENO, buf, ret);
898 if (ret < 0) {
899 exit(EXIT_FAILURE);
902 if (ret < 0) {
903 error_report("Cannot read from daemon: %s",
904 strerror(errno));
905 exit(EXIT_FAILURE);
908 /* Usually the daemon should not print any message.
909 * Exit with zero status in that case.
911 exit(errors);
915 if (device != NULL && sockpath == NULL) {
916 sockpath = g_malloc(128);
917 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
920 if (socket_activation == 0) {
921 server_ioc = qio_channel_socket_new();
922 saddr = nbd_build_socket_address(sockpath, bindto, port);
923 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
924 object_unref(OBJECT(server_ioc));
925 error_report_err(local_err);
926 return 1;
928 } else {
929 /* See comment in check_socket_activation above. */
930 assert(socket_activation == 1);
931 server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
932 &local_err);
933 if (server_ioc == NULL) {
934 error_report("Failed to use socket activation: %s",
935 error_get_pretty(local_err));
936 exit(EXIT_FAILURE);
940 if (qemu_init_main_loop(&local_err)) {
941 error_report_err(local_err);
942 exit(EXIT_FAILURE);
944 bdrv_init();
945 atexit(bdrv_close_all);
947 srcpath = argv[optind];
948 if (imageOpts) {
949 QemuOpts *opts;
950 if (fmt) {
951 error_report("--image-opts and -f are mutually exclusive");
952 exit(EXIT_FAILURE);
954 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
955 if (!opts) {
956 qemu_opts_reset(&file_opts);
957 exit(EXIT_FAILURE);
959 options = qemu_opts_to_qdict(opts, NULL);
960 qemu_opts_reset(&file_opts);
961 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
962 } else {
963 if (fmt) {
964 options = qdict_new();
965 qdict_put_str(options, "driver", fmt);
967 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
970 if (!blk) {
971 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
972 argv[optind]);
973 exit(EXIT_FAILURE);
975 bs = blk_bs(blk);
977 blk_set_enable_write_cache(blk, !writethrough);
979 if (sn_opts) {
980 ret = bdrv_snapshot_load_tmp(bs,
981 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
982 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
983 &local_err);
984 } else if (sn_id_or_name) {
985 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
986 &local_err);
988 if (ret < 0) {
989 error_reportf_err(local_err, "Failed to load snapshot: ");
990 exit(EXIT_FAILURE);
993 bs->detect_zeroes = detect_zeroes;
994 fd_size = blk_getlength(blk);
995 if (fd_size < 0) {
996 error_report("Failed to determine the image length: %s",
997 strerror(-fd_size));
998 exit(EXIT_FAILURE);
1001 if (dev_offset >= fd_size) {
1002 error_report("Offset (%lld) has to be smaller than the image size "
1003 "(%lld)",
1004 (long long int)dev_offset, (long long int)fd_size);
1005 exit(EXIT_FAILURE);
1007 fd_size -= dev_offset;
1009 if (partition != -1) {
1010 ret = find_partition(blk, partition, &dev_offset, &fd_size);
1011 if (ret < 0) {
1012 error_report("Could not find partition %d: %s", partition,
1013 strerror(-ret));
1014 exit(EXIT_FAILURE);
1018 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1019 writethrough, NULL, &local_err);
1020 if (!exp) {
1021 error_report_err(local_err);
1022 exit(EXIT_FAILURE);
1024 if (export_name) {
1025 nbd_export_set_name(exp, export_name);
1026 nbd_export_set_description(exp, export_description);
1027 newproto = true;
1028 } else if (export_description) {
1029 error_report("Export description requires an export name");
1030 exit(EXIT_FAILURE);
1033 if (device) {
1034 int ret;
1036 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1037 if (ret != 0) {
1038 error_report("Failed to create client thread: %s", strerror(ret));
1039 exit(EXIT_FAILURE);
1041 } else {
1042 /* Shut up GCC warnings. */
1043 memset(&client_thread, 0, sizeof(client_thread));
1046 nbd_update_server_watch();
1048 /* now when the initialization is (almost) complete, chdir("/")
1049 * to free any busy filesystems */
1050 if (chdir("/") < 0) {
1051 error_report("Could not chdir to root directory: %s",
1052 strerror(errno));
1053 exit(EXIT_FAILURE);
1056 if (fork_process) {
1057 dup2(old_stderr, STDERR_FILENO);
1058 close(old_stderr);
1061 state = RUNNING;
1062 do {
1063 main_loop_wait(false);
1064 if (state == TERMINATE) {
1065 state = TERMINATING;
1066 nbd_export_close(exp);
1067 nbd_export_put(exp);
1068 exp = NULL;
1070 } while (state != TERMINATED);
1072 blk_unref(blk);
1073 if (sockpath) {
1074 unlink(sockpath);
1077 qemu_opts_del(sn_opts);
1079 if (device) {
1080 void *ret;
1081 pthread_join(client_thread, &ret);
1082 exit(ret != NULL);
1083 } else {
1084 exit(EXIT_SUCCESS);