scsi-disk: bdrv_attach_dev() for empty CD-ROM
[qemu/kevin.git] / qemu-nbd.c
blob78d05bea2d32b68996ba40f9da6414bd1dbfd598
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 "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"
40 #include <getopt.h>
41 #include <libgen.h>
42 #include <pthread.h>
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
54 #define MBR_SIZE 512
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;
69 static void usage(const char *name)
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");
129 static void version(const char *name)
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);
141 struct partition_record
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;
155 static void read_partition(uint8_t *p, struct partition_record *r)
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;
166 r->start_sector_abs = ldl_le_p(p + 8);
167 r->nb_sectors_abs = ldl_le_p(p + 12);
170 static int find_partition(BlockBackend *blk, int partition,
171 off_t *offset, off_t *size)
173 struct partition_record mbr[4];
174 uint8_t data[MBR_SIZE];
175 int i;
176 int ext_partnum = 4;
177 int ret;
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);
185 if (data[510] != 0x55 || data[511] != 0xaa) {
186 return -EINVAL;
189 for (i = 0; i < 4; i++) {
190 read_partition(&data[446 + 16 * i], &mbr[i]);
192 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
193 continue;
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;
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);
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;
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;
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;
228 return -ENOENT;
231 static void termsig_handler(int signum)
233 atomic_cmpxchg(&state, RUNNING, TERMINATE);
234 qemu_notify_event();
238 static void *show_parts(void *arg)
240 char *device = arg;
241 int nbd;
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
248 nbd = open(device, O_RDWR);
249 if (nbd >= 0) {
250 close(nbd);
252 return NULL;
255 static void *nbd_client_thread(void *arg)
257 char *device = arg;
258 NBDExportInfo info = { .request_sizes = false, };
259 QIOChannelSocket *sioc;
260 int fd;
261 int ret;
262 pthread_t show_parts_thread;
263 Error *local_error = NULL;
265 sioc = qio_channel_socket_new();
266 if (qio_channel_socket_connect_sync(sioc,
267 saddr,
268 &local_error) < 0) {
269 error_report_err(local_error);
270 goto out;
273 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL,
274 NULL, NULL, NULL, &info, &local_error);
275 if (ret < 0) {
276 if (local_error) {
277 error_report_err(local_error);
279 goto out_socket;
282 fd = open(device, O_RDWR);
283 if (fd < 0) {
284 /* Linux-only, we can use %m in printf. */
285 error_report("Failed to open %s: %m", device);
286 goto out_socket;
289 ret = nbd_init(fd, sioc, &info, &local_error);
290 if (ret < 0) {
291 error_report_err(local_error);
292 goto out_fd;
295 /* update partition table */
296 pthread_create(&show_parts_thread, NULL, show_parts, device);
298 if (verbose) {
299 fprintf(stderr, "NBD device %s is now connected to %s\n",
300 device, srcpath);
301 } else {
302 /* Close stderr so that the qemu-nbd process exits. */
303 dup2(STDOUT_FILENO, STDERR_FILENO);
306 ret = nbd_client(fd);
307 if (ret) {
308 goto out_fd;
310 close(fd);
311 object_unref(OBJECT(sioc));
312 kill(getpid(), SIGTERM);
313 return (void *) EXIT_SUCCESS;
315 out_fd:
316 close(fd);
317 out_socket:
318 object_unref(OBJECT(sioc));
319 out:
320 kill(getpid(), SIGTERM);
321 return (void *) EXIT_FAILURE;
324 static int nbd_can_accept(void)
326 return state == RUNNING && nb_fds < shared;
329 static void nbd_export_closed(NBDExport *exp)
331 assert(state == TERMINATING);
332 state = TERMINATED;
335 static void nbd_update_server_watch(void);
337 static void nbd_client_closed(NBDClient *client, bool negotiated)
339 nb_fds--;
340 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
341 state = TERMINATE;
343 nbd_update_server_watch();
344 nbd_client_put(client);
347 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
349 QIOChannelSocket *cioc;
351 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
352 NULL);
353 if (!cioc) {
354 return TRUE;
357 if (state >= TERMINATE) {
358 object_unref(OBJECT(cioc));
359 return TRUE;
362 nb_fds++;
363 nbd_update_server_watch();
364 nbd_client_new(newproto ? NULL : exp, cioc,
365 tlscreds, NULL, nbd_client_closed);
366 object_unref(OBJECT(cioc));
368 return TRUE;
371 static void nbd_update_server_watch(void)
373 if (nbd_can_accept()) {
374 if (server_watch == -1) {
375 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
376 G_IO_IN,
377 nbd_accept,
378 NULL, NULL);
380 } else {
381 if (server_watch != -1) {
382 g_source_remove(server_watch);
383 server_watch = -1;
389 static SocketAddress *nbd_build_socket_address(const char *sockpath,
390 const char *bindto,
391 const char *port)
393 SocketAddress *saddr;
395 saddr = g_new0(SocketAddress, 1);
396 if (sockpath) {
397 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
398 saddr->u.q_unix.path = g_strdup(sockpath);
399 } else {
400 InetSocketAddress *inet;
401 saddr->type = SOCKET_ADDRESS_TYPE_INET;
402 inet = &saddr->u.inet;
403 inet->host = g_strdup(bindto);
404 if (port) {
405 inet->port = g_strdup(port);
406 } else {
407 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
411 return saddr;
415 static QemuOptsList file_opts = {
416 .name = "file",
417 .implied_opt_name = "file",
418 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
419 .desc = {
420 /* no elements => accept any params */
421 { /* end of list */ }
425 static QemuOptsList qemu_object_opts = {
426 .name = "object",
427 .implied_opt_name = "qom-type",
428 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
429 .desc = {
436 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
438 Object *obj;
439 QCryptoTLSCreds *creds;
441 obj = object_resolve_path_component(
442 object_get_objects_root(), id);
443 if (!obj) {
444 error_setg(errp, "No TLS credentials with id '%s'",
445 id);
446 return NULL;
448 creds = (QCryptoTLSCreds *)
449 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
450 if (!creds) {
451 error_setg(errp, "Object with id '%s' is not TLS credentials",
452 id);
453 return NULL;
456 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
457 error_setg(errp,
458 "Expecting TLS credentials with a server endpoint");
459 return NULL;
461 object_ref(obj);
462 return creds;
465 static void setup_address_and_port(const char **address, const char **port)
467 if (*address == NULL) {
468 *address = "0.0.0.0";
471 if (*port == NULL) {
472 *port = stringify(NBD_DEFAULT_PORT);
477 * Check socket parameters compatibility when socket activation is used.
479 static const char *socket_activation_validate_opts(const char *device,
480 const char *sockpath,
481 const char *address,
482 const char *port)
484 if (device != NULL) {
485 return "NBD device can't be set when using socket activation";
488 if (sockpath != NULL) {
489 return "Unix socket can't be set when using socket activation";
492 if (address != NULL) {
493 return "The interface can't be set when using socket activation";
496 if (port != NULL) {
497 return "TCP port number can't be set when using socket activation";
500 return NULL;
503 int main(int argc, char **argv)
505 BlockBackend *blk;
506 BlockDriverState *bs;
507 off_t dev_offset = 0;
508 uint16_t nbdflags = 0;
509 bool disconnect = false;
510 const char *bindto = NULL;
511 const char *port = NULL;
512 char *sockpath = NULL;
513 char *device = NULL;
514 off_t fd_size;
515 QemuOpts *sn_opts = NULL;
516 const char *sn_id_or_name = NULL;
517 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
518 struct option lopt[] = {
519 { "help", no_argument, NULL, 'h' },
520 { "version", no_argument, NULL, 'V' },
521 { "bind", required_argument, NULL, 'b' },
522 { "port", required_argument, NULL, 'p' },
523 { "socket", required_argument, NULL, 'k' },
524 { "offset", required_argument, NULL, 'o' },
525 { "read-only", no_argument, NULL, 'r' },
526 { "partition", required_argument, NULL, 'P' },
527 { "connect", required_argument, NULL, 'c' },
528 { "disconnect", no_argument, NULL, 'd' },
529 { "snapshot", no_argument, NULL, 's' },
530 { "load-snapshot", required_argument, NULL, 'l' },
531 { "nocache", no_argument, NULL, 'n' },
532 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
533 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
534 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
535 { "detect-zeroes", required_argument, NULL,
536 QEMU_NBD_OPT_DETECT_ZEROES },
537 { "shared", required_argument, NULL, 'e' },
538 { "format", required_argument, NULL, 'f' },
539 { "persistent", no_argument, NULL, 't' },
540 { "verbose", no_argument, NULL, 'v' },
541 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
542 { "export-name", required_argument, NULL, 'x' },
543 { "description", required_argument, NULL, 'D' },
544 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
545 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
546 { "trace", required_argument, NULL, 'T' },
547 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
548 { NULL, 0, NULL, 0 }
550 int ch;
551 int opt_ind = 0;
552 char *end;
553 int flags = BDRV_O_RDWR;
554 int partition = -1;
555 int ret = 0;
556 bool seen_cache = false;
557 bool seen_discard = false;
558 bool seen_aio = false;
559 pthread_t client_thread;
560 const char *fmt = NULL;
561 Error *local_err = NULL;
562 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
563 QDict *options = NULL;
564 const char *export_name = NULL;
565 const char *export_description = NULL;
566 const char *tlscredsid = NULL;
567 bool imageOpts = false;
568 bool writethrough = true;
569 char *trace_file = NULL;
570 bool fork_process = false;
571 int old_stderr = -1;
572 unsigned socket_activation;
574 /* The client thread uses SIGTERM to interrupt the server. A signal
575 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
577 struct sigaction sa_sigterm;
578 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
579 sa_sigterm.sa_handler = termsig_handler;
580 sigaction(SIGTERM, &sa_sigterm, NULL);
582 #ifdef CONFIG_POSIX
583 signal(SIGPIPE, SIG_IGN);
584 #endif
586 module_call_init(MODULE_INIT_TRACE);
587 qcrypto_init(&error_fatal);
589 module_call_init(MODULE_INIT_QOM);
590 qemu_add_opts(&qemu_object_opts);
591 qemu_add_opts(&qemu_trace_opts);
592 qemu_init_exec_dir(argv[0]);
594 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
595 switch (ch) {
596 case 's':
597 flags |= BDRV_O_SNAPSHOT;
598 break;
599 case 'n':
600 optarg = (char *) "none";
601 /* fallthrough */
602 case QEMU_NBD_OPT_CACHE:
603 if (seen_cache) {
604 error_report("-n and --cache can only be specified once");
605 exit(EXIT_FAILURE);
607 seen_cache = true;
608 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
609 error_report("Invalid cache mode `%s'", optarg);
610 exit(EXIT_FAILURE);
612 break;
613 case QEMU_NBD_OPT_AIO:
614 if (seen_aio) {
615 error_report("--aio can only be specified once");
616 exit(EXIT_FAILURE);
618 seen_aio = true;
619 if (!strcmp(optarg, "native")) {
620 flags |= BDRV_O_NATIVE_AIO;
621 } else if (!strcmp(optarg, "threads")) {
622 /* this is the default */
623 } else {
624 error_report("invalid aio mode `%s'", optarg);
625 exit(EXIT_FAILURE);
627 break;
628 case QEMU_NBD_OPT_DISCARD:
629 if (seen_discard) {
630 error_report("--discard can only be specified once");
631 exit(EXIT_FAILURE);
633 seen_discard = true;
634 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
635 error_report("Invalid discard mode `%s'", optarg);
636 exit(EXIT_FAILURE);
638 break;
639 case QEMU_NBD_OPT_DETECT_ZEROES:
640 detect_zeroes =
641 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
642 optarg,
643 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
644 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
645 &local_err);
646 if (local_err) {
647 error_reportf_err(local_err,
648 "Failed to parse detect_zeroes mode: ");
649 exit(EXIT_FAILURE);
651 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
652 !(flags & BDRV_O_UNMAP)) {
653 error_report("setting detect-zeroes to unmap is not allowed "
654 "without setting discard operation to unmap");
655 exit(EXIT_FAILURE);
657 break;
658 case 'b':
659 bindto = optarg;
660 break;
661 case 'p':
662 port = optarg;
663 break;
664 case 'o':
665 dev_offset = strtoll (optarg, &end, 0);
666 if (*end) {
667 error_report("Invalid offset `%s'", optarg);
668 exit(EXIT_FAILURE);
670 if (dev_offset < 0) {
671 error_report("Offset must be positive `%s'", optarg);
672 exit(EXIT_FAILURE);
674 break;
675 case 'l':
676 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
677 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
678 optarg, false);
679 if (!sn_opts) {
680 error_report("Failed in parsing snapshot param `%s'",
681 optarg);
682 exit(EXIT_FAILURE);
684 } else {
685 sn_id_or_name = optarg;
687 /* fall through */
688 case 'r':
689 nbdflags |= NBD_FLAG_READ_ONLY;
690 flags &= ~BDRV_O_RDWR;
691 break;
692 case 'P':
693 partition = strtol(optarg, &end, 0);
694 if (*end) {
695 error_report("Invalid partition `%s'", optarg);
696 exit(EXIT_FAILURE);
698 if (partition < 1 || partition > 8) {
699 error_report("Invalid partition %d", partition);
700 exit(EXIT_FAILURE);
702 break;
703 case 'k':
704 sockpath = optarg;
705 if (sockpath[0] != '/') {
706 error_report("socket path must be absolute");
707 exit(EXIT_FAILURE);
709 break;
710 case 'd':
711 disconnect = true;
712 break;
713 case 'c':
714 device = optarg;
715 break;
716 case 'e':
717 shared = strtol(optarg, &end, 0);
718 if (*end) {
719 error_report("Invalid shared device number '%s'", optarg);
720 exit(EXIT_FAILURE);
722 if (shared < 1) {
723 error_report("Shared device number must be greater than 0");
724 exit(EXIT_FAILURE);
726 break;
727 case 'f':
728 fmt = optarg;
729 break;
730 case 't':
731 persistent = 1;
732 break;
733 case 'x':
734 export_name = optarg;
735 break;
736 case 'D':
737 export_description = optarg;
738 break;
739 case 'v':
740 verbose = 1;
741 break;
742 case 'V':
743 version(argv[0]);
744 exit(0);
745 break;
746 case 'h':
747 usage(argv[0]);
748 exit(0);
749 break;
750 case '?':
751 error_report("Try `%s --help' for more information.", argv[0]);
752 exit(EXIT_FAILURE);
753 case QEMU_NBD_OPT_OBJECT: {
754 QemuOpts *opts;
755 opts = qemu_opts_parse_noisily(&qemu_object_opts,
756 optarg, true);
757 if (!opts) {
758 exit(EXIT_FAILURE);
760 } break;
761 case QEMU_NBD_OPT_TLSCREDS:
762 tlscredsid = optarg;
763 break;
764 case QEMU_NBD_OPT_IMAGE_OPTS:
765 imageOpts = true;
766 break;
767 case 'T':
768 g_free(trace_file);
769 trace_file = trace_opt_parse(optarg);
770 break;
771 case QEMU_NBD_OPT_FORK:
772 fork_process = true;
773 break;
777 if ((argc - optind) != 1) {
778 error_report("Invalid number of arguments");
779 error_printf("Try `%s --help' for more information.\n", argv[0]);
780 exit(EXIT_FAILURE);
783 if (qemu_opts_foreach(&qemu_object_opts,
784 user_creatable_add_opts_foreach,
785 NULL, NULL)) {
786 exit(EXIT_FAILURE);
789 if (!trace_init_backends()) {
790 exit(1);
792 trace_init_file(trace_file);
793 qemu_set_log(LOG_TRACE);
795 socket_activation = check_socket_activation();
796 if (socket_activation == 0) {
797 setup_address_and_port(&bindto, &port);
798 } else {
799 /* Using socket activation - check user didn't use -p etc. */
800 const char *err_msg = socket_activation_validate_opts(device, sockpath,
801 bindto, port);
802 if (err_msg != NULL) {
803 error_report("%s", err_msg);
804 exit(EXIT_FAILURE);
807 /* qemu-nbd can only listen on a single socket. */
808 if (socket_activation > 1) {
809 error_report("qemu-nbd does not support socket activation with %s > 1",
810 "LISTEN_FDS");
811 exit(EXIT_FAILURE);
815 if (tlscredsid) {
816 if (sockpath) {
817 error_report("TLS is only supported with IPv4/IPv6");
818 exit(EXIT_FAILURE);
820 if (device) {
821 error_report("TLS is not supported with a host device");
822 exit(EXIT_FAILURE);
824 if (!export_name) {
825 /* Set the default NBD protocol export name, since
826 * we *must* use new style protocol for TLS */
827 export_name = "";
829 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
830 if (local_err) {
831 error_report("Failed to get TLS creds %s",
832 error_get_pretty(local_err));
833 exit(EXIT_FAILURE);
837 if (disconnect) {
838 int nbdfd = open(argv[optind], O_RDWR);
839 if (nbdfd < 0) {
840 error_report("Cannot open %s: %s", argv[optind],
841 strerror(errno));
842 exit(EXIT_FAILURE);
844 nbd_disconnect(nbdfd);
846 close(nbdfd);
848 printf("%s disconnected\n", argv[optind]);
850 return 0;
853 if ((device && !verbose) || fork_process) {
854 int stderr_fd[2];
855 pid_t pid;
856 int ret;
858 if (qemu_pipe(stderr_fd) < 0) {
859 error_report("Error setting up communication pipe: %s",
860 strerror(errno));
861 exit(EXIT_FAILURE);
864 /* Now daemonize, but keep a communication channel open to
865 * print errors and exit with the proper status code.
867 pid = fork();
868 if (pid < 0) {
869 error_report("Failed to fork: %s", strerror(errno));
870 exit(EXIT_FAILURE);
871 } else if (pid == 0) {
872 close(stderr_fd[0]);
873 ret = qemu_daemon(1, 0);
875 /* Temporarily redirect stderr to the parent's pipe... */
876 old_stderr = dup(STDERR_FILENO);
877 dup2(stderr_fd[1], STDERR_FILENO);
878 if (ret < 0) {
879 error_report("Failed to daemonize: %s", strerror(errno));
880 exit(EXIT_FAILURE);
883 /* ... close the descriptor we inherited and go on. */
884 close(stderr_fd[1]);
885 } else {
886 bool errors = false;
887 char *buf;
889 /* In the parent. Print error messages from the child until
890 * it closes the pipe.
892 close(stderr_fd[1]);
893 buf = g_malloc(1024);
894 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
895 errors = true;
896 ret = qemu_write_full(STDERR_FILENO, buf, ret);
897 if (ret < 0) {
898 exit(EXIT_FAILURE);
901 if (ret < 0) {
902 error_report("Cannot read from daemon: %s",
903 strerror(errno));
904 exit(EXIT_FAILURE);
907 /* Usually the daemon should not print any message.
908 * Exit with zero status in that case.
910 exit(errors);
914 if (device != NULL && sockpath == NULL) {
915 sockpath = g_malloc(128);
916 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
919 if (socket_activation == 0) {
920 server_ioc = qio_channel_socket_new();
921 saddr = nbd_build_socket_address(sockpath, bindto, port);
922 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
923 object_unref(OBJECT(server_ioc));
924 error_report_err(local_err);
925 return 1;
927 } else {
928 /* See comment in check_socket_activation above. */
929 assert(socket_activation == 1);
930 server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
931 &local_err);
932 if (server_ioc == NULL) {
933 error_report("Failed to use socket activation: %s",
934 error_get_pretty(local_err));
935 exit(EXIT_FAILURE);
939 if (qemu_init_main_loop(&local_err)) {
940 error_report_err(local_err);
941 exit(EXIT_FAILURE);
943 bdrv_init();
944 atexit(bdrv_close_all);
946 srcpath = argv[optind];
947 if (imageOpts) {
948 QemuOpts *opts;
949 if (fmt) {
950 error_report("--image-opts and -f are mutually exclusive");
951 exit(EXIT_FAILURE);
953 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
954 if (!opts) {
955 qemu_opts_reset(&file_opts);
956 exit(EXIT_FAILURE);
958 options = qemu_opts_to_qdict(opts, NULL);
959 qemu_opts_reset(&file_opts);
960 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
961 } else {
962 if (fmt) {
963 options = qdict_new();
964 qdict_put_str(options, "driver", fmt);
966 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
969 if (!blk) {
970 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
971 argv[optind]);
972 exit(EXIT_FAILURE);
974 bs = blk_bs(blk);
976 blk_set_enable_write_cache(blk, !writethrough);
978 if (sn_opts) {
979 ret = bdrv_snapshot_load_tmp(bs,
980 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
981 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
982 &local_err);
983 } else if (sn_id_or_name) {
984 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
985 &local_err);
987 if (ret < 0) {
988 error_reportf_err(local_err, "Failed to load snapshot: ");
989 exit(EXIT_FAILURE);
992 bs->detect_zeroes = detect_zeroes;
993 fd_size = blk_getlength(blk);
994 if (fd_size < 0) {
995 error_report("Failed to determine the image length: %s",
996 strerror(-fd_size));
997 exit(EXIT_FAILURE);
1000 if (dev_offset >= fd_size) {
1001 error_report("Offset (%lld) has to be smaller than the image size "
1002 "(%lld)",
1003 (long long int)dev_offset, (long long int)fd_size);
1004 exit(EXIT_FAILURE);
1006 fd_size -= dev_offset;
1008 if (partition != -1) {
1009 ret = find_partition(blk, partition, &dev_offset, &fd_size);
1010 if (ret < 0) {
1011 error_report("Could not find partition %d: %s", partition,
1012 strerror(-ret));
1013 exit(EXIT_FAILURE);
1017 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
1018 writethrough, NULL, &local_err);
1019 if (!exp) {
1020 error_report_err(local_err);
1021 exit(EXIT_FAILURE);
1023 if (export_name) {
1024 nbd_export_set_name(exp, export_name);
1025 nbd_export_set_description(exp, export_description);
1026 newproto = true;
1027 } else if (export_description) {
1028 error_report("Export description requires an export name");
1029 exit(EXIT_FAILURE);
1032 if (device) {
1033 int ret;
1035 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
1036 if (ret != 0) {
1037 error_report("Failed to create client thread: %s", strerror(ret));
1038 exit(EXIT_FAILURE);
1040 } else {
1041 /* Shut up GCC warnings. */
1042 memset(&client_thread, 0, sizeof(client_thread));
1045 nbd_update_server_watch();
1047 /* now when the initialization is (almost) complete, chdir("/")
1048 * to free any busy filesystems */
1049 if (chdir("/") < 0) {
1050 error_report("Could not chdir to root directory: %s",
1051 strerror(errno));
1052 exit(EXIT_FAILURE);
1055 if (fork_process) {
1056 dup2(old_stderr, STDERR_FILENO);
1057 close(old_stderr);
1060 state = RUNNING;
1061 do {
1062 main_loop_wait(false);
1063 if (state == TERMINATE) {
1064 state = TERMINATING;
1065 nbd_export_close(exp);
1066 nbd_export_put(exp);
1067 exp = NULL;
1069 } while (state != TERMINATED);
1071 blk_unref(blk);
1072 if (sockpath) {
1073 unlink(sockpath);
1076 qemu_opts_del(sn_opts);
1078 if (device) {
1079 void *ret;
1080 pthread_join(client_thread, &ret);
1081 exit(ret != NULL);
1082 } else {
1083 exit(EXIT_SUCCESS);