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thscd831bd2008-07-03 10:23:51 +00001/*
bellard7a5ca862008-05-27 21:13:40 +00002 * 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
Blue Swirl8167ee82009-07-16 20:47:01 +000016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
bellard7a5ca862008-05-27 21:13:40 +000017 */
18
Peter Maydelld38ea872016-01-29 17:50:05 +000019#include "qemu/osdep.h"
Eric Blakec2a3d7d2017-07-21 08:50:47 -050020#include <getopt.h>
21#include <libgen.h>
22#include <pthread.h>
23
Markus Armbrusterda34e652016-03-14 09:01:28 +010024#include "qapi/error.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020025#include "qemu/cutils.h"
Markus Armbruster26f54e92014-10-07 13:59:04 +020026#include "sysemu/block-backend.h"
Peter Lievenb3838a42014-08-13 19:20:18 +020027#include "block/block_int.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010028#include "block/nbd.h"
Alex Bligh6a1751b2013-08-21 16:02:47 +010029#include "qemu/main-loop.h"
Markus Armbruster922a01a2018-02-01 12:18:46 +010030#include "qemu/option.h"
Paolo Bonzini537b41f2014-02-17 14:43:51 +010031#include "qemu/error-report.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000032#include "qemu/config-file.h"
Paolo Bonzini58369e22016-03-15 17:22:36 +010033#include "qemu/bswap.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030034#include "qemu/log.h"
Paolo Bonzini53fabd42017-03-16 16:29:45 +010035#include "qemu/systemd.h"
Wenchao Xia8c116b02013-12-04 17:10:55 +080036#include "block/snapshot.h"
Markus Armbruster452fcdb2018-02-01 12:18:39 +010037#include "qapi/qmp/qdict.h"
Markus Armbrusterd49b6832015-03-17 18:29:20 +010038#include "qapi/qmp/qstring.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000039#include "qom/object_interfaces.h"
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +000040#include "io/channel-socket.h"
Daniel P. Berrangee4849c12017-12-18 10:16:43 +000041#include "io/net-listener.h"
Daniel P. Berrangec2297082016-04-06 12:12:06 +010042#include "crypto/init.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030043#include "trace/control.h"
Eric Blakebe377132017-07-21 08:50:46 -050044#include "qemu-version.h"
bellard7a5ca862008-05-27 21:13:40 +000045
Peter Lieven713cc672014-08-13 19:20:19 +020046#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
Daniel P. Berrangefa8b7ce2016-02-17 10:10:21 +000047#define QEMU_NBD_OPT_CACHE 256
48#define QEMU_NBD_OPT_AIO 257
49#define QEMU_NBD_OPT_DISCARD 258
50#define QEMU_NBD_OPT_DETECT_ZEROES 259
51#define QEMU_NBD_OPT_OBJECT 260
52#define QEMU_NBD_OPT_TLSCREDS 261
53#define QEMU_NBD_OPT_IMAGE_OPTS 262
Max Reitzffb31e12016-09-28 22:46:42 +020054#define QEMU_NBD_OPT_FORK 263
bellard7a5ca862008-05-27 21:13:40 +000055
Eric Blakebd31c212016-05-06 10:26:42 -060056#define MBR_SIZE 512
57
Paolo Bonziniaf49bbb2011-09-19 14:03:37 +020058static NBDExport *exp;
blueswir1b1d8e522008-10-26 13:43:07 +000059static int verbose;
Paolo Bonzinia517e882011-11-04 15:51:21 +010060static char *srcpath;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +020061static SocketAddress *saddr;
Paolo Bonzini7860a382012-09-18 13:31:56 +020062static int persistent = 0;
63static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
Paolo Bonzinia61c6782011-09-12 17:28:11 +020064static int shared = 1;
65static int nb_fds;
Daniel P. Berrangee4849c12017-12-18 10:16:43 +000066static QIONetListener *server;
Daniel P. Berrange145614a2016-02-10 18:41:13 +000067static QCryptoTLSCreds *tlscreds;
bellard7a5ca862008-05-27 21:13:40 +000068
69static void usage(const char *name)
70{
Paolo Bonzinib033cd82012-07-18 14:50:52 +020071 (printf) (
bellard7a5ca862008-05-27 21:13:40 +000072"Usage: %s [OPTIONS] FILE\n"
73"QEMU Disk Network Block Device Server\n"
74"\n"
Peter Lieven713cc672014-08-13 19:20:19 +020075" -h, --help display this help and exit\n"
76" -V, --version output version information and exit\n"
bellard7a5ca862008-05-27 21:13:40 +000077"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020078"Connection properties:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020079" -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"
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +030086" -x, --export-name=NAME expose export by name (default is empty string)\n"
87" -D, --description=TEXT export a human-readable description\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020088"\n"
89"Exposing part of the image:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020090" -o, --offset=OFFSET offset into the image\n"
91" -P, --partition=NUM only expose partition NUM\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020092"\n"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000093"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"
Eric Blakef7812df2018-10-03 13:04:26 -050096" --tls-creds=ID use id of an earlier --object to provide TLS\n"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030097" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
98" specify tracing options\n"
Max Reitzffb31e12016-09-28 22:46:42 +020099" --fork fork off the server process and exit the parent\n"
100" once the server is running\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200101#ifdef __linux__
102"Kernel NBD client support:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200103" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
104" -d, --disconnect disconnect the specified device\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200105"\n"
106#endif
107"\n"
108"Block device options:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200109" -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"
Wenchao Xia8c116b02013-12-04 17:10:55 +0800114" -l, --load-snapshot=SNAPSHOT_PARAM\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200115" 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"
Peter Lieven713cc672014-08-13 19:20:19 +0200121" --aio=MODE set AIO mode (native or threads)\n"
Peter Lievenb3838a42014-08-13 19:20:18 +0200122" --discard=MODE set discard mode (ignore, unmap)\n"
Andrey Korolyov6883de62015-07-31 22:12:54 +0300123" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000124" --image-opts treat FILE as a full set of image options\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200125"\n"
Eric Blakef5048cb2017-08-03 11:33:53 -0500126QEMU_HELP_BOTTOM "\n"
Laurent Vivierc2e28722010-09-17 20:37:25 +0200127 , name, NBD_DEFAULT_PORT, "DEVICE");
bellard7a5ca862008-05-27 21:13:40 +0000128}
129
130static void version(const char *name)
131{
132 printf(
Thomas Huth7e563bf2018-02-15 12:06:47 +0100133"%s " QEMU_FULL_VERSION "\n"
bellard7a5ca862008-05-27 21:13:40 +0000134"Written by Anthony Liguori.\n"
135"\n"
Eric Blakebe377132017-07-21 08:50:46 -0500136QEMU_COPYRIGHT "\n"
bellard7a5ca862008-05-27 21:13:40 +0000137"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"
ths315bc7a2008-07-18 18:06:23 +0000139 , name);
bellard7a5ca862008-05-27 21:13:40 +0000140}
141
142struct partition_record
143{
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;
154};
155
156static void read_partition(uint8_t *p, struct partition_record *r)
157{
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;
Max Reitzac973932015-02-25 13:08:23 -0500166
Peter Maydell773dce32016-06-10 16:00:36 +0100167 r->start_sector_abs = ldl_le_p(p + 8);
168 r->nb_sectors_abs = ldl_le_p(p + 12);
bellard7a5ca862008-05-27 21:13:40 +0000169}
170
Max Reitz4c58e802014-11-18 12:21:19 +0100171static int find_partition(BlockBackend *blk, int partition,
bellard7a5ca862008-05-27 21:13:40 +0000172 off_t *offset, off_t *size)
173{
174 struct partition_record mbr[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600175 uint8_t data[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000176 int i;
177 int ext_partnum = 4;
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900178 int ret;
bellard7a5ca862008-05-27 21:13:40 +0000179
Eric Blakebd31c212016-05-06 10:26:42 -0600180 ret = blk_pread(blk, 0, data, sizeof(data));
181 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100182 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100183 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900184 }
bellard7a5ca862008-05-27 21:13:40 +0000185
186 if (data[510] != 0x55 || data[511] != 0xaa) {
Paolo Bonzini185b4332012-03-05 08:56:10 +0100187 return -EINVAL;
bellard7a5ca862008-05-27 21:13:40 +0000188 }
189
190 for (i = 0; i < 4; i++) {
191 read_partition(&data[446 + 16 * i], &mbr[i]);
192
Max Reitz453b07b2015-02-25 13:08:15 -0500193 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000194 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500195 }
bellard7a5ca862008-05-27 21:13:40 +0000196
197 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
198 struct partition_record ext[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600199 uint8_t data1[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000200 int j;
201
Eric Blakebd31c212016-05-06 10:26:42 -0600202 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
203 data1, sizeof(data1));
204 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100205 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100206 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900207 }
bellard7a5ca862008-05-27 21:13:40 +0000208
209 for (j = 0; j < 4; j++) {
210 read_partition(&data1[446 + 16 * j], &ext[j]);
Max Reitz453b07b2015-02-25 13:08:15 -0500211 if (!ext[j].system || !ext[j].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000212 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500213 }
bellard7a5ca862008-05-27 21:13:40 +0000214
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;
219 }
220 }
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;
226 }
227 }
228
Paolo Bonzini185b4332012-03-05 08:56:10 +0100229 return -ENOENT;
bellard7a5ca862008-05-27 21:13:40 +0000230}
231
Paolo Bonzinibb345112011-11-04 15:51:19 +0100232static void termsig_handler(int signum)
233{
Pavel Butsykin23994a52016-04-14 13:20:15 +0300234 atomic_cmpxchg(&state, RUNNING, TERMINATE);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200235 qemu_notify_event();
Paolo Bonzinibb345112011-11-04 15:51:19 +0100236}
237
Paolo Bonzini537b41f2014-02-17 14:43:51 +0100238
Paolo Bonzinia517e882011-11-04 15:51:21 +0100239static void *show_parts(void *arg)
thscd831bd2008-07-03 10:23:51 +0000240{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100241 char *device = arg;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100242 int nbd;
thscd831bd2008-07-03 10:23:51 +0000243
Paolo Bonzinia517e882011-11-04 15:51:21 +0100244 /* 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
248 */
249 nbd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100250 if (nbd >= 0) {
Paolo Bonzinia517e882011-11-04 15:51:21 +0100251 close(nbd);
thscd831bd2008-07-03 10:23:51 +0000252 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100253 return NULL;
254}
255
256static void *nbd_client_thread(void *arg)
257{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100258 char *device = arg;
Eric Blake081dd1f2017-07-07 15:30:49 -0500259 NBDExportInfo info = { .request_sizes = false, };
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000260 QIOChannelSocket *sioc;
261 int fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100262 int ret;
263 pthread_t show_parts_thread;
Max Reitz1ce52842015-01-26 21:02:59 -0500264 Error *local_error = NULL;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100265
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000266 sioc = qio_channel_socket_new();
267 if (qio_channel_socket_connect_sync(sioc,
268 saddr,
269 &local_error) < 0) {
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100270 error_report_err(local_error);
Stefan Hajnoczidc10e8b2012-01-05 13:16:07 +0000271 goto out;
272 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100273
Eric Blake004a89f2017-07-07 15:30:41 -0500274 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL,
275 NULL, NULL, NULL, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100276 if (ret < 0) {
Max Reitz1ce52842015-01-26 21:02:59 -0500277 if (local_error) {
Markus Armbruster78288672015-12-18 16:35:07 +0100278 error_report_err(local_error);
Max Reitz1ce52842015-01-26 21:02:59 -0500279 }
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100280 goto out_socket;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100281 }
282
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100283 fd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100284 if (fd < 0) {
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100285 /* Linux-only, we can use %m in printf. */
Markus Armbrusterb9884682015-12-18 16:35:18 +0100286 error_report("Failed to open %s: %m", device);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100287 goto out_socket;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100288 }
289
Eric Blake004a89f2017-07-07 15:30:41 -0500290 ret = nbd_init(fd, sioc, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100291 if (ret < 0) {
Vladimir Sementsov-Ogievskiybe41c102017-05-26 14:09:13 +0300292 error_report_err(local_error);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100293 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100294 }
295
296 /* update partition table */
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100297 pthread_create(&show_parts_thread, NULL, show_parts, device);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100298
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100299 if (verbose) {
300 fprintf(stderr, "NBD device %s is now connected to %s\n",
301 device, srcpath);
302 } else {
303 /* Close stderr so that the qemu-nbd process exits. */
304 dup2(STDOUT_FILENO, STDERR_FILENO);
305 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100306
307 ret = nbd_client(fd);
308 if (ret) {
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100309 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100310 }
311 close(fd);
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000312 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100313 kill(getpid(), SIGTERM);
314 return (void *) EXIT_SUCCESS;
315
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100316out_fd:
317 close(fd);
318out_socket:
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000319 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100320out:
321 kill(getpid(), SIGTERM);
322 return (void *) EXIT_FAILURE;
thscd831bd2008-07-03 10:23:51 +0000323}
324
Fam Zhenge4afbf42015-05-19 10:50:59 +0000325static int nbd_can_accept(void)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200326{
Eric Blakedf8ad9f2017-05-26 22:04:21 -0500327 return state == RUNNING && nb_fds < shared;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200328}
329
Paolo Bonzini7860a382012-09-18 13:31:56 +0200330static void nbd_export_closed(NBDExport *exp)
331{
332 assert(state == TERMINATING);
333 state = TERMINATED;
334}
335
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000336static void nbd_update_server_watch(void);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000337
Eric Blake0c9390d2017-06-08 17:26:17 -0500338static void nbd_client_closed(NBDClient *client, bool negotiated)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200339{
Paolo Bonzini1743b512011-09-19 14:33:23 +0200340 nb_fds--;
Eric Blake0c9390d2017-06-08 17:26:17 -0500341 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
Paolo Bonzini7860a382012-09-18 13:31:56 +0200342 state = TERMINATE;
343 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000344 nbd_update_server_watch();
Paolo Bonzini7860a382012-09-18 13:31:56 +0200345 nbd_client_put(client);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200346}
347
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000348static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
349 gpointer opaque)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200350{
Paolo Bonzini7860a382012-09-18 13:31:56 +0200351 if (state >= TERMINATE) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000352 return;
Paolo Bonzini7860a382012-09-18 13:31:56 +0200353 }
354
Fam Zhengee7d7aa2016-01-14 16:41:01 +0800355 nb_fds++;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000356 nbd_update_server_watch();
Vladimir Sementsov-Ogievskiy7f7dfe22018-10-03 20:02:28 +0300357 nbd_client_new(cioc, tlscreds, NULL, nbd_client_closed);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200358}
359
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000360static void nbd_update_server_watch(void)
Fam Zhenge4afbf42015-05-19 10:50:59 +0000361{
362 if (nbd_can_accept()) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000363 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000364 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000365 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000366 }
367}
368
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100369
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200370static SocketAddress *nbd_build_socket_address(const char *sockpath,
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100371 const char *bindto,
372 const char *port)
373{
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200374 SocketAddress *saddr;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100375
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200376 saddr = g_new0(SocketAddress, 1);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100377 if (sockpath) {
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200378 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
379 saddr->u.q_unix.path = g_strdup(sockpath);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100380 } else {
Eric Blake03992932016-03-03 09:16:48 -0700381 InetSocketAddress *inet;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200382 saddr->type = SOCKET_ADDRESS_TYPE_INET;
383 inet = &saddr->u.inet;
Eric Blake03992932016-03-03 09:16:48 -0700384 inet->host = g_strdup(bindto);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100385 if (port) {
Eric Blake03992932016-03-03 09:16:48 -0700386 inet->port = g_strdup(port);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100387 } else {
Eric Blake03992932016-03-03 09:16:48 -0700388 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100389 }
390 }
391
392 return saddr;
393}
394
395
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000396static QemuOptsList file_opts = {
397 .name = "file",
398 .implied_opt_name = "file",
399 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
400 .desc = {
401 /* no elements => accept any params */
402 { /* end of list */ }
403 },
404};
405
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000406static QemuOptsList qemu_object_opts = {
407 .name = "object",
408 .implied_opt_name = "qom-type",
409 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
410 .desc = {
411 { }
412 },
413};
414
415
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000416
417static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
418{
419 Object *obj;
420 QCryptoTLSCreds *creds;
421
422 obj = object_resolve_path_component(
423 object_get_objects_root(), id);
424 if (!obj) {
425 error_setg(errp, "No TLS credentials with id '%s'",
426 id);
427 return NULL;
428 }
429 creds = (QCryptoTLSCreds *)
430 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
431 if (!creds) {
432 error_setg(errp, "Object with id '%s' is not TLS credentials",
433 id);
434 return NULL;
435 }
436
437 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
438 error_setg(errp,
439 "Expecting TLS credentials with a server endpoint");
440 return NULL;
441 }
442 object_ref(obj);
443 return creds;
444}
445
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000446static void setup_address_and_port(const char **address, const char **port)
447{
448 if (*address == NULL) {
449 *address = "0.0.0.0";
450 }
451
452 if (*port == NULL) {
453 *port = stringify(NBD_DEFAULT_PORT);
454 }
455}
456
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000457/*
458 * Check socket parameters compatibility when socket activation is used.
459 */
460static const char *socket_activation_validate_opts(const char *device,
461 const char *sockpath,
462 const char *address,
463 const char *port)
464{
465 if (device != NULL) {
466 return "NBD device can't be set when using socket activation";
467 }
468
469 if (sockpath != NULL) {
470 return "Unix socket can't be set when using socket activation";
471 }
472
473 if (address != NULL) {
474 return "The interface can't be set when using socket activation";
475 }
476
477 if (port != NULL) {
478 return "TCP port number can't be set when using socket activation";
479 }
480
481 return NULL;
482}
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000483
Kevin Wolfb3b52992018-05-16 13:46:37 +0200484static void qemu_nbd_shutdown(void)
485{
486 job_cancel_sync_all();
487 bdrv_close_all();
488}
489
bellard7a5ca862008-05-27 21:13:40 +0000490int main(int argc, char **argv)
491{
Markus Armbruster26f54e92014-10-07 13:59:04 +0200492 BlockBackend *blk;
bellard7a5ca862008-05-27 21:13:40 +0000493 BlockDriverState *bs;
494 off_t dev_offset = 0;
Eric Blake7423f412016-07-21 13:34:46 -0600495 uint16_t nbdflags = 0;
thscd831bd2008-07-03 10:23:51 +0000496 bool disconnect = false;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000497 const char *bindto = NULL;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100498 const char *port = NULL;
499 char *sockpath = NULL;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100500 char *device = NULL;
bellard7a5ca862008-05-27 21:13:40 +0000501 off_t fd_size;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800502 QemuOpts *sn_opts = NULL;
503 const char *sn_id_or_name = NULL;
Eric Blakeb1a75b32016-10-14 13:33:03 -0500504 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
bellard7a5ca862008-05-27 21:13:40 +0000505 struct option lopt[] = {
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000506 { "help", no_argument, NULL, 'h' },
507 { "version", no_argument, NULL, 'V' },
508 { "bind", required_argument, NULL, 'b' },
509 { "port", required_argument, NULL, 'p' },
510 { "socket", required_argument, NULL, 'k' },
511 { "offset", required_argument, NULL, 'o' },
512 { "read-only", no_argument, NULL, 'r' },
513 { "partition", required_argument, NULL, 'P' },
514 { "connect", required_argument, NULL, 'c' },
515 { "disconnect", no_argument, NULL, 'd' },
516 { "snapshot", no_argument, NULL, 's' },
517 { "load-snapshot", required_argument, NULL, 'l' },
518 { "nocache", no_argument, NULL, 'n' },
519 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
520 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
521 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
522 { "detect-zeroes", required_argument, NULL,
523 QEMU_NBD_OPT_DETECT_ZEROES },
524 { "shared", required_argument, NULL, 'e' },
525 { "format", required_argument, NULL, 'f' },
526 { "persistent", no_argument, NULL, 't' },
527 { "verbose", no_argument, NULL, 'v' },
528 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
529 { "export-name", required_argument, NULL, 'x' },
Eric Blakeb1a75b32016-10-14 13:33:03 -0500530 { "description", required_argument, NULL, 'D' },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000531 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
532 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300533 { "trace", required_argument, NULL, 'T' },
Max Reitzffb31e12016-09-28 22:46:42 +0200534 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
Blue Swirl660f11b2009-07-31 21:16:51 +0000535 { NULL, 0, NULL, 0 }
bellard7a5ca862008-05-27 21:13:40 +0000536 };
537 int ch;
538 int opt_ind = 0;
bellard7a5ca862008-05-27 21:13:40 +0000539 char *end;
Naphtali Spreif5edb012010-01-17 16:48:13 +0200540 int flags = BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000541 int partition = -1;
Max Reitz4fbec262015-02-05 13:58:19 -0500542 int ret = 0;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200543 bool seen_cache = false;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100544 bool seen_discard = false;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200545 bool seen_aio = false;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100546 pthread_t client_thread;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000547 const char *fmt = NULL;
Max Reitz34b5d2c2013-09-05 14:45:29 +0200548 Error *local_err = NULL;
Peter Lievenb3838a42014-08-13 19:20:18 +0200549 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
Max Reitz4fbec262015-02-05 13:58:19 -0500550 QDict *options = NULL;
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +0300551 const char *export_name = ""; /* Default export name */
Eric Blakeb1a75b32016-10-14 13:33:03 -0500552 const char *export_description = NULL;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000553 const char *tlscredsid = NULL;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000554 bool imageOpts = false;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100555 bool writethrough = true;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300556 char *trace_file = NULL;
Max Reitzffb31e12016-09-28 22:46:42 +0200557 bool fork_process = false;
558 int old_stderr = -1;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000559 unsigned socket_activation;
bellard7a5ca862008-05-27 21:13:40 +0000560
Paolo Bonzinia517e882011-11-04 15:51:21 +0100561 /* The client thread uses SIGTERM to interrupt the server. A signal
562 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
563 */
Paolo Bonzinibb345112011-11-04 15:51:19 +0100564 struct sigaction sa_sigterm;
Paolo Bonzinibb345112011-11-04 15:51:19 +0100565 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
566 sa_sigterm.sa_handler = termsig_handler;
567 sigaction(SIGTERM, &sa_sigterm, NULL);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100568
Max Reitz041e32b2017-06-11 14:37:14 +0200569#ifdef CONFIG_POSIX
570 signal(SIGPIPE, SIG_IGN);
571#endif
572
Daniel P. Berrangefe4db842016-10-04 14:35:52 +0100573 module_call_init(MODULE_INIT_TRACE);
Eduardo Habkoste8f2d272016-05-12 11:10:04 -0300574 qcrypto_init(&error_fatal);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100575
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000576 module_call_init(MODULE_INIT_QOM);
577 qemu_add_opts(&qemu_object_opts);
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300578 qemu_add_opts(&qemu_trace_opts);
Fam Zheng10f5bff2014-02-10 14:48:51 +0800579 qemu_init_exec_dir(argv[0]);
Paolo Bonzinibb345112011-11-04 15:51:19 +0100580
bellard7a5ca862008-05-27 21:13:40 +0000581 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
582 switch (ch) {
583 case 's':
ths2f726482008-07-03 11:47:46 +0000584 flags |= BDRV_O_SNAPSHOT;
585 break;
586 case 'n':
Paolo Bonzini39a52352012-07-18 14:57:15 +0200587 optarg = (char *) "none";
588 /* fallthrough */
589 case QEMU_NBD_OPT_CACHE:
590 if (seen_cache) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100591 error_report("-n and --cache can only be specified once");
592 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200593 }
594 seen_cache = true;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100595 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100596 error_report("Invalid cache mode `%s'", optarg);
597 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200598 }
bellard7a5ca862008-05-27 21:13:40 +0000599 break;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200600 case QEMU_NBD_OPT_AIO:
601 if (seen_aio) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100602 error_report("--aio can only be specified once");
603 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200604 }
605 seen_aio = true;
606 if (!strcmp(optarg, "native")) {
607 flags |= BDRV_O_NATIVE_AIO;
608 } else if (!strcmp(optarg, "threads")) {
609 /* this is the default */
610 } else {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100611 error_report("invalid aio mode `%s'", optarg);
612 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200613 }
614 break;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100615 case QEMU_NBD_OPT_DISCARD:
616 if (seen_discard) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100617 error_report("--discard can only be specified once");
618 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100619 }
620 seen_discard = true;
621 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100622 error_report("Invalid discard mode `%s'", optarg);
623 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100624 }
625 break;
Peter Lievenb3838a42014-08-13 19:20:18 +0200626 case QEMU_NBD_OPT_DETECT_ZEROES:
627 detect_zeroes =
Marc-André Lureauf7abe0e2017-08-24 10:46:10 +0200628 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
Peter Lievenb3838a42014-08-13 19:20:18 +0200629 optarg,
Peter Lievenb3838a42014-08-13 19:20:18 +0200630 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
631 &local_err);
632 if (local_err) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100633 error_reportf_err(local_err,
634 "Failed to parse detect_zeroes mode: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100635 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200636 }
637 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
638 !(flags & BDRV_O_UNMAP)) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100639 error_report("setting detect-zeroes to unmap is not allowed "
640 "without setting discard operation to unmap");
641 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200642 }
643 break;
bellard7a5ca862008-05-27 21:13:40 +0000644 case 'b':
645 bindto = optarg;
646 break;
647 case 'p':
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100648 port = optarg;
bellard7a5ca862008-05-27 21:13:40 +0000649 break;
650 case 'o':
651 dev_offset = strtoll (optarg, &end, 0);
652 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100653 error_report("Invalid offset `%s'", optarg);
654 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000655 }
656 if (dev_offset < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100657 error_report("Offset must be positive `%s'", optarg);
658 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000659 }
660 break;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800661 case 'l':
662 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
Markus Armbruster70b94332015-02-13 12:50:26 +0100663 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
664 optarg, false);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800665 if (!sn_opts) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100666 error_report("Failed in parsing snapshot param `%s'",
667 optarg);
668 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800669 }
670 } else {
671 sn_id_or_name = optarg;
672 }
673 /* fall through */
bellard7a5ca862008-05-27 21:13:40 +0000674 case 'r':
Paolo Bonzinib90fb4b2011-09-08 17:24:54 +0200675 nbdflags |= NBD_FLAG_READ_ONLY;
Naphtali Sprei07108b22010-03-14 15:19:57 +0200676 flags &= ~BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000677 break;
678 case 'P':
679 partition = strtol(optarg, &end, 0);
Peter Lieven713cc672014-08-13 19:20:19 +0200680 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100681 error_report("Invalid partition `%s'", optarg);
682 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200683 }
684 if (partition < 1 || partition > 8) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100685 error_report("Invalid partition %d", partition);
686 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200687 }
bellard7a5ca862008-05-27 21:13:40 +0000688 break;
thscd831bd2008-07-03 10:23:51 +0000689 case 'k':
Paolo Bonzinib32f6c22011-11-04 15:51:20 +0100690 sockpath = optarg;
Peter Lieven713cc672014-08-13 19:20:19 +0200691 if (sockpath[0] != '/') {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100692 error_report("socket path must be absolute");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100693 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200694 }
thscd831bd2008-07-03 10:23:51 +0000695 break;
696 case 'd':
697 disconnect = true;
698 break;
699 case 'c':
700 device = optarg;
701 break;
ths3b05a8e2008-07-03 12:45:02 +0000702 case 'e':
703 shared = strtol(optarg, &end, 0);
704 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100705 error_report("Invalid shared device number '%s'", optarg);
706 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000707 }
708 if (shared < 1) {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100709 error_report("Shared device number must be greater than 0");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100710 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000711 }
712 break;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000713 case 'f':
714 fmt = optarg;
715 break;
Peter Lieven713cc672014-08-13 19:20:19 +0200716 case 't':
717 persistent = 1;
718 break;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000719 case 'x':
720 export_name = optarg;
721 break;
Eric Blakeb1a75b32016-10-14 13:33:03 -0500722 case 'D':
723 export_description = optarg;
724 break;
bellard7a5ca862008-05-27 21:13:40 +0000725 case 'v':
726 verbose = 1;
727 break;
728 case 'V':
729 version(argv[0]);
730 exit(0);
731 break;
732 case 'h':
733 usage(argv[0]);
734 exit(0);
735 break;
736 case '?':
Markus Armbruster85b01e02015-12-18 16:35:04 +0100737 error_report("Try `%s --help' for more information.", argv[0]);
738 exit(EXIT_FAILURE);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000739 case QEMU_NBD_OPT_OBJECT: {
740 QemuOpts *opts;
741 opts = qemu_opts_parse_noisily(&qemu_object_opts,
742 optarg, true);
743 if (!opts) {
744 exit(EXIT_FAILURE);
745 }
746 } break;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000747 case QEMU_NBD_OPT_TLSCREDS:
748 tlscredsid = optarg;
749 break;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000750 case QEMU_NBD_OPT_IMAGE_OPTS:
751 imageOpts = true;
752 break;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300753 case 'T':
754 g_free(trace_file);
755 trace_file = trace_opt_parse(optarg);
756 break;
Max Reitzffb31e12016-09-28 22:46:42 +0200757 case QEMU_NBD_OPT_FORK:
758 fork_process = true;
759 break;
bellard7a5ca862008-05-27 21:13:40 +0000760 }
761 }
762
763 if ((argc - optind) != 1) {
Markus Armbruster433672b2015-12-18 16:35:24 +0100764 error_report("Invalid number of arguments");
765 error_printf("Try `%s --help' for more information.\n", argv[0]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100766 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000767 }
768
Markus Armbruster7e1e0c12018-10-17 10:26:43 +0200769 qemu_opts_foreach(&qemu_object_opts,
770 user_creatable_add_opts_foreach,
771 NULL, &error_fatal);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000772
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300773 if (!trace_init_backends()) {
774 exit(1);
775 }
776 trace_init_file(trace_file);
777 qemu_set_log(LOG_TRACE);
778
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000779 socket_activation = check_socket_activation();
780 if (socket_activation == 0) {
781 setup_address_and_port(&bindto, &port);
782 } else {
783 /* Using socket activation - check user didn't use -p etc. */
784 const char *err_msg = socket_activation_validate_opts(device, sockpath,
785 bindto, port);
786 if (err_msg != NULL) {
787 error_report("%s", err_msg);
788 exit(EXIT_FAILURE);
789 }
Paolo Bonzini53fabd42017-03-16 16:29:45 +0100790
791 /* qemu-nbd can only listen on a single socket. */
792 if (socket_activation > 1) {
793 error_report("qemu-nbd does not support socket activation with %s > 1",
794 "LISTEN_FDS");
795 exit(EXIT_FAILURE);
796 }
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000797 }
798
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000799 if (tlscredsid) {
800 if (sockpath) {
801 error_report("TLS is only supported with IPv4/IPv6");
802 exit(EXIT_FAILURE);
803 }
804 if (device) {
805 error_report("TLS is not supported with a host device");
806 exit(EXIT_FAILURE);
807 }
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000808 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
809 if (local_err) {
810 error_report("Failed to get TLS creds %s",
811 error_get_pretty(local_err));
812 exit(EXIT_FAILURE);
813 }
814 }
815
thscd831bd2008-07-03 10:23:51 +0000816 if (disconnect) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000817 int nbdfd = open(argv[optind], O_RDWR);
818 if (nbdfd < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100819 error_report("Cannot open %s: %s", argv[optind],
820 strerror(errno));
821 exit(EXIT_FAILURE);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100822 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000823 nbd_disconnect(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000824
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000825 close(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000826
827 printf("%s disconnected\n", argv[optind]);
828
Peter Lieven713cc672014-08-13 19:20:19 +0200829 return 0;
thscd831bd2008-07-03 10:23:51 +0000830 }
831
Max Reitzffb31e12016-09-28 22:46:42 +0200832 if ((device && !verbose) || fork_process) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100833 int stderr_fd[2];
834 pid_t pid;
835 int ret;
836
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100837 if (qemu_pipe(stderr_fd) < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100838 error_report("Error setting up communication pipe: %s",
839 strerror(errno));
840 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100841 }
842
843 /* Now daemonize, but keep a communication channel open to
844 * print errors and exit with the proper status code.
845 */
846 pid = fork();
Max Reitz70d47392015-02-25 13:08:22 -0500847 if (pid < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100848 error_report("Failed to fork: %s", strerror(errno));
849 exit(EXIT_FAILURE);
Max Reitz70d47392015-02-25 13:08:22 -0500850 } else if (pid == 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100851 close(stderr_fd[0]);
Michael Tokarev9faf31b2012-01-16 18:37:44 +0400852 ret = qemu_daemon(1, 0);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100853
854 /* Temporarily redirect stderr to the parent's pipe... */
Max Reitzffb31e12016-09-28 22:46:42 +0200855 old_stderr = dup(STDERR_FILENO);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100856 dup2(stderr_fd[1], STDERR_FILENO);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100857 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100858 error_report("Failed to daemonize: %s", strerror(errno));
859 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100860 }
861
862 /* ... close the descriptor we inherited and go on. */
863 close(stderr_fd[1]);
864 } else {
865 bool errors = false;
866 char *buf;
867
868 /* In the parent. Print error messages from the child until
869 * it closes the pipe.
870 */
871 close(stderr_fd[1]);
872 buf = g_malloc(1024);
873 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
874 errors = true;
875 ret = qemu_write_full(STDERR_FILENO, buf, ret);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100876 if (ret < 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100877 exit(EXIT_FAILURE);
878 }
879 }
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100880 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100881 error_report("Cannot read from daemon: %s",
882 strerror(errno));
883 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100884 }
885
886 /* Usually the daemon should not print any message.
887 * Exit with zero status in that case.
888 */
889 exit(errors);
890 }
891 }
892
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100893 if (device != NULL && sockpath == NULL) {
894 sockpath = g_malloc(128);
895 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
thscd831bd2008-07-03 10:23:51 +0000896 }
897
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000898 server = qio_net_listener_new();
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000899 if (socket_activation == 0) {
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000900 saddr = nbd_build_socket_address(sockpath, bindto, port);
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000901 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) {
902 object_unref(OBJECT(server));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000903 error_report_err(local_err);
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000904 exit(EXIT_FAILURE);
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000905 }
906 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000907 size_t i;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000908 /* See comment in check_socket_activation above. */
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000909 for (i = 0; i < socket_activation; i++) {
910 QIOChannelSocket *sioc;
911 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
912 &local_err);
913 if (sioc == NULL) {
914 object_unref(OBJECT(server));
915 error_report("Failed to use socket activation: %s",
916 error_get_pretty(local_err));
917 exit(EXIT_FAILURE);
918 }
919 qio_net_listener_add(server, sioc);
920 object_unref(OBJECT(sioc));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000921 }
922 }
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100923
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300924 if (qemu_init_main_loop(&local_err)) {
Markus Armbruster565f65d2015-02-12 13:55:05 +0100925 error_report_err(local_err);
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300926 exit(EXIT_FAILURE);
927 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100928 bdrv_init();
Kevin Wolfb3b52992018-05-16 13:46:37 +0200929 atexit(qemu_nbd_shutdown);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100930
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000931 srcpath = argv[optind];
932 if (imageOpts) {
933 QemuOpts *opts;
934 if (fmt) {
935 error_report("--image-opts and -f are mutually exclusive");
936 exit(EXIT_FAILURE);
937 }
938 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
939 if (!opts) {
940 qemu_opts_reset(&file_opts);
941 exit(EXIT_FAILURE);
942 }
943 options = qemu_opts_to_qdict(opts, NULL);
944 qemu_opts_reset(&file_opts);
Max Reitzefaa7c42016-03-16 19:54:38 +0100945 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000946 } else {
947 if (fmt) {
948 options = qdict_new();
Eric Blake46f5ac22017-04-27 16:58:17 -0500949 qdict_put_str(options, "driver", fmt);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000950 }
Max Reitzefaa7c42016-03-16 19:54:38 +0100951 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000952 }
953
Max Reitz4fbec262015-02-05 13:58:19 -0500954 if (!blk) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100955 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
956 argv[optind]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100957 exit(EXIT_FAILURE);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100958 }
Max Reitz4fbec262015-02-05 13:58:19 -0500959 bs = blk_bs(blk);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100960
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100961 blk_set_enable_write_cache(blk, !writethrough);
962
Wenchao Xia8c116b02013-12-04 17:10:55 +0800963 if (sn_opts) {
964 ret = bdrv_snapshot_load_tmp(bs,
965 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
966 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
967 &local_err);
968 } else if (sn_id_or_name) {
969 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
970 &local_err);
971 }
972 if (ret < 0) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100973 error_reportf_err(local_err, "Failed to load snapshot: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100974 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800975 }
976
Peter Lievenb3838a42014-08-13 19:20:18 +0200977 bs->detect_zeroes = detect_zeroes;
Max Reitz4c58e802014-11-18 12:21:19 +0100978 fd_size = blk_getlength(blk);
Max Reitz98f44bb2015-02-25 13:08:21 -0500979 if (fd_size < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100980 error_report("Failed to determine the image length: %s",
981 strerror(-fd_size));
982 exit(EXIT_FAILURE);
Max Reitz98f44bb2015-02-25 13:08:21 -0500983 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100984
Tomáš Golembiovskýe424b652016-10-05 23:40:20 +0200985 if (dev_offset >= fd_size) {
986 error_report("Offset (%lld) has to be smaller than the image size "
987 "(%lld)",
988 (long long int)dev_offset, (long long int)fd_size);
989 exit(EXIT_FAILURE);
990 }
991 fd_size -= dev_offset;
992
Paolo Bonzini185b4332012-03-05 08:56:10 +0100993 if (partition != -1) {
Max Reitz4c58e802014-11-18 12:21:19 +0100994 ret = find_partition(blk, partition, &dev_offset, &fd_size);
Paolo Bonzini185b4332012-03-05 08:56:10 +0100995 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100996 error_report("Could not find partition %d: %s", partition,
Markus Armbrustera4699e52015-12-18 16:35:10 +0100997 strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100998 exit(EXIT_FAILURE);
Paolo Bonzini185b4332012-03-05 08:56:10 +0100999 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001000 }
1001
Kevin Wolfcd7fca92016-07-06 11:22:39 +02001002 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
Markus Armbruster50beeb62018-10-17 10:26:26 +02001003 writethrough, NULL, &error_fatal);
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +03001004 nbd_export_set_name(exp, export_name);
1005 nbd_export_set_description(exp, export_description);
ths3b05a8e2008-07-03 12:45:02 +00001006
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001007 if (device) {
1008 int ret;
1009
Paolo Bonzinia6ac2312011-12-06 09:07:00 +01001010 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001011 if (ret != 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001012 error_report("Failed to create client thread: %s", strerror(ret));
1013 exit(EXIT_FAILURE);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001014 }
1015 } else {
1016 /* Shut up GCC warnings. */
1017 memset(&client_thread, 0, sizeof(client_thread));
1018 }
1019
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +00001020 nbd_update_server_watch();
bellard7a5ca862008-05-27 21:13:40 +00001021
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001022 /* now when the initialization is (almost) complete, chdir("/")
1023 * to free any busy filesystems */
1024 if (chdir("/") < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001025 error_report("Could not chdir to root directory: %s",
1026 strerror(errno));
1027 exit(EXIT_FAILURE);
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001028 }
1029
Max Reitzffb31e12016-09-28 22:46:42 +02001030 if (fork_process) {
1031 dup2(old_stderr, STDERR_FILENO);
1032 close(old_stderr);
1033 }
1034
Paolo Bonzini7860a382012-09-18 13:31:56 +02001035 state = RUNNING;
ths3b05a8e2008-07-03 12:45:02 +00001036 do {
Paolo Bonzinia61c6782011-09-12 17:28:11 +02001037 main_loop_wait(false);
Paolo Bonzini7860a382012-09-18 13:31:56 +02001038 if (state == TERMINATE) {
1039 state = TERMINATING;
1040 nbd_export_close(exp);
1041 nbd_export_put(exp);
1042 exp = NULL;
1043 }
1044 } while (state != TERMINATED);
ths3b05a8e2008-07-03 12:45:02 +00001045
Markus Armbruster26f54e92014-10-07 13:59:04 +02001046 blk_unref(blk);
Paolo Bonzinib32f6c22011-11-04 15:51:20 +01001047 if (sockpath) {
1048 unlink(sockpath);
1049 }
bellard7a5ca862008-05-27 21:13:40 +00001050
Markus Armbrusterfbf28a42014-09-29 16:07:55 +02001051 qemu_opts_del(sn_opts);
Wenchao Xia8c116b02013-12-04 17:10:55 +08001052
Paolo Bonzinia517e882011-11-04 15:51:21 +01001053 if (device) {
1054 void *ret;
1055 pthread_join(client_thread, &ret);
1056 exit(ret != NULL);
1057 } else {
1058 exit(EXIT_SUCCESS);
1059 }
bellard7a5ca862008-05-27 21:13:40 +00001060}