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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 "block/snapshot.h" | |
31 | #include "qapi/util.h" | |
32 | #include "qapi/qmp/qstring.h" | |
33 | #include "qom/object_interfaces.h" | |
34 | #include "io/channel-socket.h" | |
35 | #include "crypto/init.h" | |
36 | ||
37 | #include <getopt.h> | |
38 | #include <libgen.h> | |
39 | #include <pthread.h> | |
40 | ||
41 | #define SOCKET_PATH "/var/lock/qemu-nbd-%s" | |
42 | #define QEMU_NBD_OPT_CACHE 256 | |
43 | #define QEMU_NBD_OPT_AIO 257 | |
44 | #define QEMU_NBD_OPT_DISCARD 258 | |
45 | #define QEMU_NBD_OPT_DETECT_ZEROES 259 | |
46 | #define QEMU_NBD_OPT_OBJECT 260 | |
47 | #define QEMU_NBD_OPT_TLSCREDS 261 | |
48 | #define QEMU_NBD_OPT_IMAGE_OPTS 262 | |
49 | ||
50 | #define MBR_SIZE 512 | |
51 | ||
52 | static NBDExport *exp; | |
53 | static bool newproto; | |
54 | static int verbose; | |
55 | static char *srcpath; | |
56 | static SocketAddress *saddr; | |
57 | static int persistent = 0; | |
58 | static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; | |
59 | static int shared = 1; | |
60 | static int nb_fds; | |
61 | static QIOChannelSocket *server_ioc; | |
62 | static int server_watch = -1; | |
63 | static QCryptoTLSCreds *tlscreds; | |
64 | ||
65 | static void usage(const char *name) | |
66 | { | |
67 | (printf) ( | |
68 | "Usage: %s [OPTIONS] FILE\n" | |
69 | "QEMU Disk Network Block Device Server\n" | |
70 | "\n" | |
71 | " -h, --help display this help and exit\n" | |
72 | " -V, --version output version information and exit\n" | |
73 | "\n" | |
74 | "Connection properties:\n" | |
75 | " -p, --port=PORT port to listen on (default `%d')\n" | |
76 | " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" | |
77 | " -k, --socket=PATH path to the unix socket\n" | |
78 | " (default '"SOCKET_PATH"')\n" | |
79 | " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" | |
80 | " -t, --persistent don't exit on the last connection\n" | |
81 | " -v, --verbose display extra debugging information\n" | |
82 | " -x, --export-name=NAME expose export by name\n" | |
83 | "\n" | |
84 | "Exposing part of the image:\n" | |
85 | " -o, --offset=OFFSET offset into the image\n" | |
86 | " -P, --partition=NUM only expose partition NUM\n" | |
87 | "\n" | |
88 | "General purpose options:\n" | |
89 | " --object type,id=ID,... define an object such as 'secret' for providing\n" | |
90 | " passwords and/or encryption keys\n" | |
91 | #ifdef __linux__ | |
92 | "Kernel NBD client support:\n" | |
93 | " -c, --connect=DEV connect FILE to the local NBD device DEV\n" | |
94 | " -d, --disconnect disconnect the specified device\n" | |
95 | "\n" | |
96 | #endif | |
97 | "\n" | |
98 | "Block device options:\n" | |
99 | " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" | |
100 | " -r, --read-only export read-only\n" | |
101 | " -s, --snapshot use FILE as an external snapshot, create a temporary\n" | |
102 | " file with backing_file=FILE, redirect the write to\n" | |
103 | " the temporary one\n" | |
104 | " -l, --load-snapshot=SNAPSHOT_PARAM\n" | |
105 | " load an internal snapshot inside FILE and export it\n" | |
106 | " as an read-only device, SNAPSHOT_PARAM format is\n" | |
107 | " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" | |
108 | " '[ID_OR_NAME]'\n" | |
109 | " -n, --nocache disable host cache\n" | |
110 | " --cache=MODE set cache mode (none, writeback, ...)\n" | |
111 | " --aio=MODE set AIO mode (native or threads)\n" | |
112 | " --discard=MODE set discard mode (ignore, unmap)\n" | |
113 | " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" | |
114 | " --image-opts treat FILE as a full set of image options\n" | |
115 | "\n" | |
116 | "Report bugs to <qemu-devel@nongnu.org>\n" | |
117 | , name, NBD_DEFAULT_PORT, "DEVICE"); | |
118 | } | |
119 | ||
120 | static void version(const char *name) | |
121 | { | |
122 | printf( | |
123 | "%s version 0.0.1\n" | |
124 | "Written by Anthony Liguori.\n" | |
125 | "\n" | |
126 | "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" | |
127 | "This is free software; see the source for copying conditions. There is NO\n" | |
128 | "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" | |
129 | , name); | |
130 | } | |
131 | ||
132 | struct partition_record | |
133 | { | |
134 | uint8_t bootable; | |
135 | uint8_t start_head; | |
136 | uint32_t start_cylinder; | |
137 | uint8_t start_sector; | |
138 | uint8_t system; | |
139 | uint8_t end_head; | |
140 | uint8_t end_cylinder; | |
141 | uint8_t end_sector; | |
142 | uint32_t start_sector_abs; | |
143 | uint32_t nb_sectors_abs; | |
144 | }; | |
145 | ||
146 | static void read_partition(uint8_t *p, struct partition_record *r) | |
147 | { | |
148 | r->bootable = p[0]; | |
149 | r->start_head = p[1]; | |
150 | r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); | |
151 | r->start_sector = p[2] & 0x3f; | |
152 | r->system = p[4]; | |
153 | r->end_head = p[5]; | |
154 | r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); | |
155 | r->end_sector = p[6] & 0x3f; | |
156 | ||
157 | r->start_sector_abs = ldl_le_p(p + 8); | |
158 | r->nb_sectors_abs = ldl_le_p(p + 12); | |
159 | } | |
160 | ||
161 | static int find_partition(BlockBackend *blk, int partition, | |
162 | off_t *offset, off_t *size) | |
163 | { | |
164 | struct partition_record mbr[4]; | |
165 | uint8_t data[MBR_SIZE]; | |
166 | int i; | |
167 | int ext_partnum = 4; | |
168 | int ret; | |
169 | ||
170 | ret = blk_pread(blk, 0, data, sizeof(data)); | |
171 | if (ret < 0) { | |
172 | error_report("error while reading: %s", strerror(-ret)); | |
173 | exit(EXIT_FAILURE); | |
174 | } | |
175 | ||
176 | if (data[510] != 0x55 || data[511] != 0xaa) { | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | for (i = 0; i < 4; i++) { | |
181 | read_partition(&data[446 + 16 * i], &mbr[i]); | |
182 | ||
183 | if (!mbr[i].system || !mbr[i].nb_sectors_abs) { | |
184 | continue; | |
185 | } | |
186 | ||
187 | if (mbr[i].system == 0xF || mbr[i].system == 0x5) { | |
188 | struct partition_record ext[4]; | |
189 | uint8_t data1[MBR_SIZE]; | |
190 | int j; | |
191 | ||
192 | ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, | |
193 | data1, sizeof(data1)); | |
194 | if (ret < 0) { | |
195 | error_report("error while reading: %s", strerror(-ret)); | |
196 | exit(EXIT_FAILURE); | |
197 | } | |
198 | ||
199 | for (j = 0; j < 4; j++) { | |
200 | read_partition(&data1[446 + 16 * j], &ext[j]); | |
201 | if (!ext[j].system || !ext[j].nb_sectors_abs) { | |
202 | continue; | |
203 | } | |
204 | ||
205 | if ((ext_partnum + j + 1) == partition) { | |
206 | *offset = (uint64_t)ext[j].start_sector_abs << 9; | |
207 | *size = (uint64_t)ext[j].nb_sectors_abs << 9; | |
208 | return 0; | |
209 | } | |
210 | } | |
211 | ext_partnum += 4; | |
212 | } else if ((i + 1) == partition) { | |
213 | *offset = (uint64_t)mbr[i].start_sector_abs << 9; | |
214 | *size = (uint64_t)mbr[i].nb_sectors_abs << 9; | |
215 | return 0; | |
216 | } | |
217 | } | |
218 | ||
219 | return -ENOENT; | |
220 | } | |
221 | ||
222 | static void termsig_handler(int signum) | |
223 | { | |
224 | atomic_cmpxchg(&state, RUNNING, TERMINATE); | |
225 | qemu_notify_event(); | |
226 | } | |
227 | ||
228 | ||
229 | static void *show_parts(void *arg) | |
230 | { | |
231 | char *device = arg; | |
232 | int nbd; | |
233 | ||
234 | /* linux just needs an open() to trigger | |
235 | * the partition table update | |
236 | * but remember to load the module with max_part != 0 : | |
237 | * modprobe nbd max_part=63 | |
238 | */ | |
239 | nbd = open(device, O_RDWR); | |
240 | if (nbd >= 0) { | |
241 | close(nbd); | |
242 | } | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | static void *nbd_client_thread(void *arg) | |
247 | { | |
248 | char *device = arg; | |
249 | off_t size; | |
250 | uint32_t nbdflags; | |
251 | QIOChannelSocket *sioc; | |
252 | int fd; | |
253 | int ret; | |
254 | pthread_t show_parts_thread; | |
255 | Error *local_error = NULL; | |
256 | ||
257 | sioc = qio_channel_socket_new(); | |
258 | if (qio_channel_socket_connect_sync(sioc, | |
259 | saddr, | |
260 | &local_error) < 0) { | |
261 | error_report_err(local_error); | |
262 | goto out; | |
263 | } | |
264 | ||
265 | ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags, | |
266 | NULL, NULL, NULL, | |
267 | &size, &local_error); | |
268 | if (ret < 0) { | |
269 | if (local_error) { | |
270 | error_report_err(local_error); | |
271 | } | |
272 | goto out_socket; | |
273 | } | |
274 | ||
275 | fd = open(device, O_RDWR); | |
276 | if (fd < 0) { | |
277 | /* Linux-only, we can use %m in printf. */ | |
278 | error_report("Failed to open %s: %m", device); | |
279 | goto out_socket; | |
280 | } | |
281 | ||
282 | ret = nbd_init(fd, sioc, nbdflags, size); | |
283 | if (ret < 0) { | |
284 | goto out_fd; | |
285 | } | |
286 | ||
287 | /* update partition table */ | |
288 | pthread_create(&show_parts_thread, NULL, show_parts, device); | |
289 | ||
290 | if (verbose) { | |
291 | fprintf(stderr, "NBD device %s is now connected to %s\n", | |
292 | device, srcpath); | |
293 | } else { | |
294 | /* Close stderr so that the qemu-nbd process exits. */ | |
295 | dup2(STDOUT_FILENO, STDERR_FILENO); | |
296 | } | |
297 | ||
298 | ret = nbd_client(fd); | |
299 | if (ret) { | |
300 | goto out_fd; | |
301 | } | |
302 | close(fd); | |
303 | object_unref(OBJECT(sioc)); | |
304 | kill(getpid(), SIGTERM); | |
305 | return (void *) EXIT_SUCCESS; | |
306 | ||
307 | out_fd: | |
308 | close(fd); | |
309 | out_socket: | |
310 | object_unref(OBJECT(sioc)); | |
311 | out: | |
312 | kill(getpid(), SIGTERM); | |
313 | return (void *) EXIT_FAILURE; | |
314 | } | |
315 | ||
316 | static int nbd_can_accept(void) | |
317 | { | |
318 | return nb_fds < shared; | |
319 | } | |
320 | ||
321 | static void nbd_export_closed(NBDExport *exp) | |
322 | { | |
323 | assert(state == TERMINATING); | |
324 | state = TERMINATED; | |
325 | } | |
326 | ||
327 | static void nbd_update_server_watch(void); | |
328 | ||
329 | static void nbd_client_closed(NBDClient *client) | |
330 | { | |
331 | nb_fds--; | |
332 | if (nb_fds == 0 && !persistent && state == RUNNING) { | |
333 | state = TERMINATE; | |
334 | } | |
335 | nbd_update_server_watch(); | |
336 | nbd_client_put(client); | |
337 | } | |
338 | ||
339 | static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque) | |
340 | { | |
341 | QIOChannelSocket *cioc; | |
342 | ||
343 | cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), | |
344 | NULL); | |
345 | if (!cioc) { | |
346 | return TRUE; | |
347 | } | |
348 | ||
349 | if (state >= TERMINATE) { | |
350 | object_unref(OBJECT(cioc)); | |
351 | return TRUE; | |
352 | } | |
353 | ||
354 | nb_fds++; | |
355 | nbd_update_server_watch(); | |
356 | nbd_client_new(newproto ? NULL : exp, cioc, | |
357 | tlscreds, NULL, nbd_client_closed); | |
358 | object_unref(OBJECT(cioc)); | |
359 | ||
360 | return TRUE; | |
361 | } | |
362 | ||
363 | static void nbd_update_server_watch(void) | |
364 | { | |
365 | if (nbd_can_accept()) { | |
366 | if (server_watch == -1) { | |
367 | server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc), | |
368 | G_IO_IN, | |
369 | nbd_accept, | |
370 | NULL, NULL); | |
371 | } | |
372 | } else { | |
373 | if (server_watch != -1) { | |
374 | g_source_remove(server_watch); | |
375 | server_watch = -1; | |
376 | } | |
377 | } | |
378 | } | |
379 | ||
380 | ||
381 | static SocketAddress *nbd_build_socket_address(const char *sockpath, | |
382 | const char *bindto, | |
383 | const char *port) | |
384 | { | |
385 | SocketAddress *saddr; | |
386 | ||
387 | saddr = g_new0(SocketAddress, 1); | |
388 | if (sockpath) { | |
389 | saddr->type = SOCKET_ADDRESS_KIND_UNIX; | |
390 | saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); | |
391 | saddr->u.q_unix.data->path = g_strdup(sockpath); | |
392 | } else { | |
393 | InetSocketAddress *inet; | |
394 | saddr->type = SOCKET_ADDRESS_KIND_INET; | |
395 | inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1); | |
396 | inet->host = g_strdup(bindto); | |
397 | if (port) { | |
398 | inet->port = g_strdup(port); | |
399 | } else { | |
400 | inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); | |
401 | } | |
402 | } | |
403 | ||
404 | return saddr; | |
405 | } | |
406 | ||
407 | ||
408 | static QemuOptsList file_opts = { | |
409 | .name = "file", | |
410 | .implied_opt_name = "file", | |
411 | .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), | |
412 | .desc = { | |
413 | /* no elements => accept any params */ | |
414 | { /* end of list */ } | |
415 | }, | |
416 | }; | |
417 | ||
418 | static QemuOptsList qemu_object_opts = { | |
419 | .name = "object", | |
420 | .implied_opt_name = "qom-type", | |
421 | .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), | |
422 | .desc = { | |
423 | { } | |
424 | }, | |
425 | }; | |
426 | ||
427 | ||
428 | ||
429 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) | |
430 | { | |
431 | Object *obj; | |
432 | QCryptoTLSCreds *creds; | |
433 | ||
434 | obj = object_resolve_path_component( | |
435 | object_get_objects_root(), id); | |
436 | if (!obj) { | |
437 | error_setg(errp, "No TLS credentials with id '%s'", | |
438 | id); | |
439 | return NULL; | |
440 | } | |
441 | creds = (QCryptoTLSCreds *) | |
442 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); | |
443 | if (!creds) { | |
444 | error_setg(errp, "Object with id '%s' is not TLS credentials", | |
445 | id); | |
446 | return NULL; | |
447 | } | |
448 | ||
449 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
450 | error_setg(errp, | |
451 | "Expecting TLS credentials with a server endpoint"); | |
452 | return NULL; | |
453 | } | |
454 | object_ref(obj); | |
455 | return creds; | |
456 | } | |
457 | ||
458 | ||
459 | int main(int argc, char **argv) | |
460 | { | |
461 | BlockBackend *blk; | |
462 | BlockDriverState *bs; | |
463 | off_t dev_offset = 0; | |
464 | uint32_t nbdflags = 0; | |
465 | bool disconnect = false; | |
466 | const char *bindto = "0.0.0.0"; | |
467 | const char *port = NULL; | |
468 | char *sockpath = NULL; | |
469 | char *device = NULL; | |
470 | off_t fd_size; | |
471 | QemuOpts *sn_opts = NULL; | |
472 | const char *sn_id_or_name = NULL; | |
473 | const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; | |
474 | struct option lopt[] = { | |
475 | { "help", no_argument, NULL, 'h' }, | |
476 | { "version", no_argument, NULL, 'V' }, | |
477 | { "bind", required_argument, NULL, 'b' }, | |
478 | { "port", required_argument, NULL, 'p' }, | |
479 | { "socket", required_argument, NULL, 'k' }, | |
480 | { "offset", required_argument, NULL, 'o' }, | |
481 | { "read-only", no_argument, NULL, 'r' }, | |
482 | { "partition", required_argument, NULL, 'P' }, | |
483 | { "connect", required_argument, NULL, 'c' }, | |
484 | { "disconnect", no_argument, NULL, 'd' }, | |
485 | { "snapshot", no_argument, NULL, 's' }, | |
486 | { "load-snapshot", required_argument, NULL, 'l' }, | |
487 | { "nocache", no_argument, NULL, 'n' }, | |
488 | { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, | |
489 | { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, | |
490 | { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, | |
491 | { "detect-zeroes", required_argument, NULL, | |
492 | QEMU_NBD_OPT_DETECT_ZEROES }, | |
493 | { "shared", required_argument, NULL, 'e' }, | |
494 | { "format", required_argument, NULL, 'f' }, | |
495 | { "persistent", no_argument, NULL, 't' }, | |
496 | { "verbose", no_argument, NULL, 'v' }, | |
497 | { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, | |
498 | { "export-name", required_argument, NULL, 'x' }, | |
499 | { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, | |
500 | { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, | |
501 | { NULL, 0, NULL, 0 } | |
502 | }; | |
503 | int ch; | |
504 | int opt_ind = 0; | |
505 | char *end; | |
506 | int flags = BDRV_O_RDWR; | |
507 | int partition = -1; | |
508 | int ret = 0; | |
509 | bool seen_cache = false; | |
510 | bool seen_discard = false; | |
511 | bool seen_aio = false; | |
512 | pthread_t client_thread; | |
513 | const char *fmt = NULL; | |
514 | Error *local_err = NULL; | |
515 | BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; | |
516 | QDict *options = NULL; | |
517 | const char *export_name = NULL; | |
518 | const char *tlscredsid = NULL; | |
519 | bool imageOpts = false; | |
520 | bool writethrough = true; | |
521 | ||
522 | /* The client thread uses SIGTERM to interrupt the server. A signal | |
523 | * handler ensures that "qemu-nbd -v -c" exits with a nice status code. | |
524 | */ | |
525 | struct sigaction sa_sigterm; | |
526 | memset(&sa_sigterm, 0, sizeof(sa_sigterm)); | |
527 | sa_sigterm.sa_handler = termsig_handler; | |
528 | sigaction(SIGTERM, &sa_sigterm, NULL); | |
529 | ||
530 | qcrypto_init(&error_fatal); | |
531 | ||
532 | module_call_init(MODULE_INIT_QOM); | |
533 | qemu_add_opts(&qemu_object_opts); | |
534 | qemu_init_exec_dir(argv[0]); | |
535 | ||
536 | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { | |
537 | switch (ch) { | |
538 | case 's': | |
539 | flags |= BDRV_O_SNAPSHOT; | |
540 | break; | |
541 | case 'n': | |
542 | optarg = (char *) "none"; | |
543 | /* fallthrough */ | |
544 | case QEMU_NBD_OPT_CACHE: | |
545 | if (seen_cache) { | |
546 | error_report("-n and --cache can only be specified once"); | |
547 | exit(EXIT_FAILURE); | |
548 | } | |
549 | seen_cache = true; | |
550 | if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { | |
551 | error_report("Invalid cache mode `%s'", optarg); | |
552 | exit(EXIT_FAILURE); | |
553 | } | |
554 | break; | |
555 | case QEMU_NBD_OPT_AIO: | |
556 | if (seen_aio) { | |
557 | error_report("--aio can only be specified once"); | |
558 | exit(EXIT_FAILURE); | |
559 | } | |
560 | seen_aio = true; | |
561 | if (!strcmp(optarg, "native")) { | |
562 | flags |= BDRV_O_NATIVE_AIO; | |
563 | } else if (!strcmp(optarg, "threads")) { | |
564 | /* this is the default */ | |
565 | } else { | |
566 | error_report("invalid aio mode `%s'", optarg); | |
567 | exit(EXIT_FAILURE); | |
568 | } | |
569 | break; | |
570 | case QEMU_NBD_OPT_DISCARD: | |
571 | if (seen_discard) { | |
572 | error_report("--discard can only be specified once"); | |
573 | exit(EXIT_FAILURE); | |
574 | } | |
575 | seen_discard = true; | |
576 | if (bdrv_parse_discard_flags(optarg, &flags) == -1) { | |
577 | error_report("Invalid discard mode `%s'", optarg); | |
578 | exit(EXIT_FAILURE); | |
579 | } | |
580 | break; | |
581 | case QEMU_NBD_OPT_DETECT_ZEROES: | |
582 | detect_zeroes = | |
583 | qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, | |
584 | optarg, | |
585 | BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, | |
586 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, | |
587 | &local_err); | |
588 | if (local_err) { | |
589 | error_reportf_err(local_err, | |
590 | "Failed to parse detect_zeroes mode: "); | |
591 | exit(EXIT_FAILURE); | |
592 | } | |
593 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && | |
594 | !(flags & BDRV_O_UNMAP)) { | |
595 | error_report("setting detect-zeroes to unmap is not allowed " | |
596 | "without setting discard operation to unmap"); | |
597 | exit(EXIT_FAILURE); | |
598 | } | |
599 | break; | |
600 | case 'b': | |
601 | bindto = optarg; | |
602 | break; | |
603 | case 'p': | |
604 | port = optarg; | |
605 | break; | |
606 | case 'o': | |
607 | dev_offset = strtoll (optarg, &end, 0); | |
608 | if (*end) { | |
609 | error_report("Invalid offset `%s'", optarg); | |
610 | exit(EXIT_FAILURE); | |
611 | } | |
612 | if (dev_offset < 0) { | |
613 | error_report("Offset must be positive `%s'", optarg); | |
614 | exit(EXIT_FAILURE); | |
615 | } | |
616 | break; | |
617 | case 'l': | |
618 | if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { | |
619 | sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, | |
620 | optarg, false); | |
621 | if (!sn_opts) { | |
622 | error_report("Failed in parsing snapshot param `%s'", | |
623 | optarg); | |
624 | exit(EXIT_FAILURE); | |
625 | } | |
626 | } else { | |
627 | sn_id_or_name = optarg; | |
628 | } | |
629 | /* fall through */ | |
630 | case 'r': | |
631 | nbdflags |= NBD_FLAG_READ_ONLY; | |
632 | flags &= ~BDRV_O_RDWR; | |
633 | break; | |
634 | case 'P': | |
635 | partition = strtol(optarg, &end, 0); | |
636 | if (*end) { | |
637 | error_report("Invalid partition `%s'", optarg); | |
638 | exit(EXIT_FAILURE); | |
639 | } | |
640 | if (partition < 1 || partition > 8) { | |
641 | error_report("Invalid partition %d", partition); | |
642 | exit(EXIT_FAILURE); | |
643 | } | |
644 | break; | |
645 | case 'k': | |
646 | sockpath = optarg; | |
647 | if (sockpath[0] != '/') { | |
648 | error_report("socket path must be absolute"); | |
649 | exit(EXIT_FAILURE); | |
650 | } | |
651 | break; | |
652 | case 'd': | |
653 | disconnect = true; | |
654 | break; | |
655 | case 'c': | |
656 | device = optarg; | |
657 | break; | |
658 | case 'e': | |
659 | shared = strtol(optarg, &end, 0); | |
660 | if (*end) { | |
661 | error_report("Invalid shared device number '%s'", optarg); | |
662 | exit(EXIT_FAILURE); | |
663 | } | |
664 | if (shared < 1) { | |
665 | error_report("Shared device number must be greater than 0"); | |
666 | exit(EXIT_FAILURE); | |
667 | } | |
668 | break; | |
669 | case 'f': | |
670 | fmt = optarg; | |
671 | break; | |
672 | case 't': | |
673 | persistent = 1; | |
674 | break; | |
675 | case 'x': | |
676 | export_name = optarg; | |
677 | break; | |
678 | case 'v': | |
679 | verbose = 1; | |
680 | break; | |
681 | case 'V': | |
682 | version(argv[0]); | |
683 | exit(0); | |
684 | break; | |
685 | case 'h': | |
686 | usage(argv[0]); | |
687 | exit(0); | |
688 | break; | |
689 | case '?': | |
690 | error_report("Try `%s --help' for more information.", argv[0]); | |
691 | exit(EXIT_FAILURE); | |
692 | case QEMU_NBD_OPT_OBJECT: { | |
693 | QemuOpts *opts; | |
694 | opts = qemu_opts_parse_noisily(&qemu_object_opts, | |
695 | optarg, true); | |
696 | if (!opts) { | |
697 | exit(EXIT_FAILURE); | |
698 | } | |
699 | } break; | |
700 | case QEMU_NBD_OPT_TLSCREDS: | |
701 | tlscredsid = optarg; | |
702 | break; | |
703 | case QEMU_NBD_OPT_IMAGE_OPTS: | |
704 | imageOpts = true; | |
705 | break; | |
706 | } | |
707 | } | |
708 | ||
709 | if ((argc - optind) != 1) { | |
710 | error_report("Invalid number of arguments"); | |
711 | error_printf("Try `%s --help' for more information.\n", argv[0]); | |
712 | exit(EXIT_FAILURE); | |
713 | } | |
714 | ||
715 | if (qemu_opts_foreach(&qemu_object_opts, | |
716 | user_creatable_add_opts_foreach, | |
717 | NULL, NULL)) { | |
718 | exit(EXIT_FAILURE); | |
719 | } | |
720 | ||
721 | if (tlscredsid) { | |
722 | if (sockpath) { | |
723 | error_report("TLS is only supported with IPv4/IPv6"); | |
724 | exit(EXIT_FAILURE); | |
725 | } | |
726 | if (device) { | |
727 | error_report("TLS is not supported with a host device"); | |
728 | exit(EXIT_FAILURE); | |
729 | } | |
730 | if (!export_name) { | |
731 | /* Set the default NBD protocol export name, since | |
732 | * we *must* use new style protocol for TLS */ | |
733 | export_name = ""; | |
734 | } | |
735 | tlscreds = nbd_get_tls_creds(tlscredsid, &local_err); | |
736 | if (local_err) { | |
737 | error_report("Failed to get TLS creds %s", | |
738 | error_get_pretty(local_err)); | |
739 | exit(EXIT_FAILURE); | |
740 | } | |
741 | } | |
742 | ||
743 | if (disconnect) { | |
744 | int nbdfd = open(argv[optind], O_RDWR); | |
745 | if (nbdfd < 0) { | |
746 | error_report("Cannot open %s: %s", argv[optind], | |
747 | strerror(errno)); | |
748 | exit(EXIT_FAILURE); | |
749 | } | |
750 | nbd_disconnect(nbdfd); | |
751 | ||
752 | close(nbdfd); | |
753 | ||
754 | printf("%s disconnected\n", argv[optind]); | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | if (device && !verbose) { | |
760 | int stderr_fd[2]; | |
761 | pid_t pid; | |
762 | int ret; | |
763 | ||
764 | if (qemu_pipe(stderr_fd) < 0) { | |
765 | error_report("Error setting up communication pipe: %s", | |
766 | strerror(errno)); | |
767 | exit(EXIT_FAILURE); | |
768 | } | |
769 | ||
770 | /* Now daemonize, but keep a communication channel open to | |
771 | * print errors and exit with the proper status code. | |
772 | */ | |
773 | pid = fork(); | |
774 | if (pid < 0) { | |
775 | error_report("Failed to fork: %s", strerror(errno)); | |
776 | exit(EXIT_FAILURE); | |
777 | } else if (pid == 0) { | |
778 | close(stderr_fd[0]); | |
779 | ret = qemu_daemon(1, 0); | |
780 | ||
781 | /* Temporarily redirect stderr to the parent's pipe... */ | |
782 | dup2(stderr_fd[1], STDERR_FILENO); | |
783 | if (ret < 0) { | |
784 | error_report("Failed to daemonize: %s", strerror(errno)); | |
785 | exit(EXIT_FAILURE); | |
786 | } | |
787 | ||
788 | /* ... close the descriptor we inherited and go on. */ | |
789 | close(stderr_fd[1]); | |
790 | } else { | |
791 | bool errors = false; | |
792 | char *buf; | |
793 | ||
794 | /* In the parent. Print error messages from the child until | |
795 | * it closes the pipe. | |
796 | */ | |
797 | close(stderr_fd[1]); | |
798 | buf = g_malloc(1024); | |
799 | while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { | |
800 | errors = true; | |
801 | ret = qemu_write_full(STDERR_FILENO, buf, ret); | |
802 | if (ret < 0) { | |
803 | exit(EXIT_FAILURE); | |
804 | } | |
805 | } | |
806 | if (ret < 0) { | |
807 | error_report("Cannot read from daemon: %s", | |
808 | strerror(errno)); | |
809 | exit(EXIT_FAILURE); | |
810 | } | |
811 | ||
812 | /* Usually the daemon should not print any message. | |
813 | * Exit with zero status in that case. | |
814 | */ | |
815 | exit(errors); | |
816 | } | |
817 | } | |
818 | ||
819 | if (device != NULL && sockpath == NULL) { | |
820 | sockpath = g_malloc(128); | |
821 | snprintf(sockpath, 128, SOCKET_PATH, basename(device)); | |
822 | } | |
823 | ||
824 | saddr = nbd_build_socket_address(sockpath, bindto, port); | |
825 | ||
826 | if (qemu_init_main_loop(&local_err)) { | |
827 | error_report_err(local_err); | |
828 | exit(EXIT_FAILURE); | |
829 | } | |
830 | bdrv_init(); | |
831 | atexit(bdrv_close_all); | |
832 | ||
833 | srcpath = argv[optind]; | |
834 | if (imageOpts) { | |
835 | QemuOpts *opts; | |
836 | if (fmt) { | |
837 | error_report("--image-opts and -f are mutually exclusive"); | |
838 | exit(EXIT_FAILURE); | |
839 | } | |
840 | opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); | |
841 | if (!opts) { | |
842 | qemu_opts_reset(&file_opts); | |
843 | exit(EXIT_FAILURE); | |
844 | } | |
845 | options = qemu_opts_to_qdict(opts, NULL); | |
846 | qemu_opts_reset(&file_opts); | |
847 | blk = blk_new_open(NULL, NULL, options, flags, &local_err); | |
848 | } else { | |
849 | if (fmt) { | |
850 | options = qdict_new(); | |
851 | qdict_put(options, "driver", qstring_from_str(fmt)); | |
852 | } | |
853 | blk = blk_new_open(srcpath, NULL, options, flags, &local_err); | |
854 | } | |
855 | ||
856 | if (!blk) { | |
857 | error_reportf_err(local_err, "Failed to blk_new_open '%s': ", | |
858 | argv[optind]); | |
859 | exit(EXIT_FAILURE); | |
860 | } | |
861 | bs = blk_bs(blk); | |
862 | ||
863 | blk_set_enable_write_cache(blk, !writethrough); | |
864 | ||
865 | if (sn_opts) { | |
866 | ret = bdrv_snapshot_load_tmp(bs, | |
867 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), | |
868 | qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), | |
869 | &local_err); | |
870 | } else if (sn_id_or_name) { | |
871 | ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, | |
872 | &local_err); | |
873 | } | |
874 | if (ret < 0) { | |
875 | error_reportf_err(local_err, "Failed to load snapshot: "); | |
876 | exit(EXIT_FAILURE); | |
877 | } | |
878 | ||
879 | bs->detect_zeroes = detect_zeroes; | |
880 | fd_size = blk_getlength(blk); | |
881 | if (fd_size < 0) { | |
882 | error_report("Failed to determine the image length: %s", | |
883 | strerror(-fd_size)); | |
884 | exit(EXIT_FAILURE); | |
885 | } | |
886 | ||
887 | if (partition != -1) { | |
888 | ret = find_partition(blk, partition, &dev_offset, &fd_size); | |
889 | if (ret < 0) { | |
890 | error_report("Could not find partition %d: %s", partition, | |
891 | strerror(-ret)); | |
892 | exit(EXIT_FAILURE); | |
893 | } | |
894 | } | |
895 | ||
896 | exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, | |
897 | &local_err); | |
898 | if (!exp) { | |
899 | error_report_err(local_err); | |
900 | exit(EXIT_FAILURE); | |
901 | } | |
902 | if (export_name) { | |
903 | nbd_export_set_name(exp, export_name); | |
904 | newproto = true; | |
905 | } | |
906 | ||
907 | server_ioc = qio_channel_socket_new(); | |
908 | if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) { | |
909 | object_unref(OBJECT(server_ioc)); | |
910 | error_report_err(local_err); | |
911 | return 1; | |
912 | } | |
913 | ||
914 | if (device) { | |
915 | int ret; | |
916 | ||
917 | ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); | |
918 | if (ret != 0) { | |
919 | error_report("Failed to create client thread: %s", strerror(ret)); | |
920 | exit(EXIT_FAILURE); | |
921 | } | |
922 | } else { | |
923 | /* Shut up GCC warnings. */ | |
924 | memset(&client_thread, 0, sizeof(client_thread)); | |
925 | } | |
926 | ||
927 | nbd_update_server_watch(); | |
928 | ||
929 | /* now when the initialization is (almost) complete, chdir("/") | |
930 | * to free any busy filesystems */ | |
931 | if (chdir("/") < 0) { | |
932 | error_report("Could not chdir to root directory: %s", | |
933 | strerror(errno)); | |
934 | exit(EXIT_FAILURE); | |
935 | } | |
936 | ||
937 | state = RUNNING; | |
938 | do { | |
939 | main_loop_wait(false); | |
940 | if (state == TERMINATE) { | |
941 | state = TERMINATING; | |
942 | nbd_export_close(exp); | |
943 | nbd_export_put(exp); | |
944 | exp = NULL; | |
945 | } | |
946 | } while (state != TERMINATED); | |
947 | ||
948 | blk_unref(blk); | |
949 | if (sockpath) { | |
950 | unlink(sockpath); | |
951 | } | |
952 | ||
953 | qemu_opts_del(sn_opts); | |
954 | ||
955 | if (device) { | |
956 | void *ret; | |
957 | pthread_join(client_thread, &ret); | |
958 | exit(ret != NULL); | |
959 | } else { | |
960 | exit(EXIT_SUCCESS); | |
961 | } | |
962 | } |