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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
Eric Blake3c1fa352018-12-15 07:53:08 -060046#ifdef __linux__
47#define HAVE_NBD_DEVICE 1
48#else
49#define HAVE_NBD_DEVICE 0
50#endif
51
Peter Lieven713cc672014-08-13 19:20:19 +020052#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
Daniel P. Berrangefa8b7ce2016-02-17 10:10:21 +000053#define QEMU_NBD_OPT_CACHE 256
54#define QEMU_NBD_OPT_AIO 257
55#define QEMU_NBD_OPT_DISCARD 258
56#define QEMU_NBD_OPT_DETECT_ZEROES 259
57#define QEMU_NBD_OPT_OBJECT 260
58#define QEMU_NBD_OPT_TLSCREDS 261
59#define QEMU_NBD_OPT_IMAGE_OPTS 262
Max Reitzffb31e12016-09-28 22:46:42 +020060#define QEMU_NBD_OPT_FORK 263
bellard7a5ca862008-05-27 21:13:40 +000061
Eric Blakebd31c212016-05-06 10:26:42 -060062#define MBR_SIZE 512
63
Paolo Bonziniaf49bbb2011-09-19 14:03:37 +020064static NBDExport *exp;
blueswir1b1d8e522008-10-26 13:43:07 +000065static int verbose;
Paolo Bonzinia517e882011-11-04 15:51:21 +010066static char *srcpath;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +020067static SocketAddress *saddr;
Paolo Bonzini7860a382012-09-18 13:31:56 +020068static int persistent = 0;
69static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
Paolo Bonzinia61c6782011-09-12 17:28:11 +020070static int shared = 1;
71static int nb_fds;
Daniel P. Berrangee4849c12017-12-18 10:16:43 +000072static QIONetListener *server;
Daniel P. Berrange145614a2016-02-10 18:41:13 +000073static QCryptoTLSCreds *tlscreds;
bellard7a5ca862008-05-27 21:13:40 +000074
75static void usage(const char *name)
76{
Paolo Bonzinib033cd82012-07-18 14:50:52 +020077 (printf) (
bellard7a5ca862008-05-27 21:13:40 +000078"Usage: %s [OPTIONS] FILE\n"
79"QEMU Disk Network Block Device Server\n"
80"\n"
Peter Lieven713cc672014-08-13 19:20:19 +020081" -h, --help display this help and exit\n"
82" -V, --version output version information and exit\n"
bellard7a5ca862008-05-27 21:13:40 +000083"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020084"Connection properties:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020085" -p, --port=PORT port to listen on (default `%d')\n"
86" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
87" -k, --socket=PATH path to the unix socket\n"
88" (default '"SOCKET_PATH"')\n"
89" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
90" -t, --persistent don't exit on the last connection\n"
91" -v, --verbose display extra debugging information\n"
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +030092" -x, --export-name=NAME expose export by name (default is empty string)\n"
93" -D, --description=TEXT export a human-readable description\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020094"\n"
95"Exposing part of the image:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020096" -o, --offset=OFFSET offset into the image\n"
97" -P, --partition=NUM only expose partition NUM\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020098"\n"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000099"General purpose options:\n"
100" --object type,id=ID,... define an object such as 'secret' for providing\n"
101" passwords and/or encryption keys\n"
Eric Blakef7812df2018-10-03 13:04:26 -0500102" --tls-creds=ID use id of an earlier --object to provide TLS\n"
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300103" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
104" specify tracing options\n"
Max Reitzffb31e12016-09-28 22:46:42 +0200105" --fork fork off the server process and exit the parent\n"
106" once the server is running\n"
Eric Blake3c1fa352018-12-15 07:53:08 -0600107#if HAVE_NBD_DEVICE
108"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200109"Kernel NBD client support:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200110" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
111" -d, --disconnect disconnect the specified device\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200112#endif
113"\n"
114"Block device options:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200115" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
116" -r, --read-only export read-only\n"
117" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
118" file with backing_file=FILE, redirect the write to\n"
119" the temporary one\n"
Wenchao Xia8c116b02013-12-04 17:10:55 +0800120" -l, --load-snapshot=SNAPSHOT_PARAM\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200121" load an internal snapshot inside FILE and export it\n"
122" as an read-only device, SNAPSHOT_PARAM format is\n"
123" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
124" '[ID_OR_NAME]'\n"
125" -n, --nocache disable host cache\n"
126" --cache=MODE set cache mode (none, writeback, ...)\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200127" --aio=MODE set AIO mode (native or threads)\n"
Peter Lievenb3838a42014-08-13 19:20:18 +0200128" --discard=MODE set discard mode (ignore, unmap)\n"
Andrey Korolyov6883de62015-07-31 22:12:54 +0300129" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000130" --image-opts treat FILE as a full set of image options\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200131"\n"
Eric Blakef5048cb2017-08-03 11:33:53 -0500132QEMU_HELP_BOTTOM "\n"
Laurent Vivierc2e28722010-09-17 20:37:25 +0200133 , name, NBD_DEFAULT_PORT, "DEVICE");
bellard7a5ca862008-05-27 21:13:40 +0000134}
135
136static void version(const char *name)
137{
138 printf(
Thomas Huth7e563bf2018-02-15 12:06:47 +0100139"%s " QEMU_FULL_VERSION "\n"
bellard7a5ca862008-05-27 21:13:40 +0000140"Written by Anthony Liguori.\n"
141"\n"
Eric Blakebe377132017-07-21 08:50:46 -0500142QEMU_COPYRIGHT "\n"
bellard7a5ca862008-05-27 21:13:40 +0000143"This is free software; see the source for copying conditions. There is NO\n"
144"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
ths315bc7a2008-07-18 18:06:23 +0000145 , name);
bellard7a5ca862008-05-27 21:13:40 +0000146}
147
148struct partition_record
149{
150 uint8_t bootable;
151 uint8_t start_head;
152 uint32_t start_cylinder;
153 uint8_t start_sector;
154 uint8_t system;
155 uint8_t end_head;
156 uint8_t end_cylinder;
157 uint8_t end_sector;
158 uint32_t start_sector_abs;
159 uint32_t nb_sectors_abs;
160};
161
162static void read_partition(uint8_t *p, struct partition_record *r)
163{
164 r->bootable = p[0];
165 r->start_head = p[1];
166 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
167 r->start_sector = p[2] & 0x3f;
168 r->system = p[4];
169 r->end_head = p[5];
170 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
171 r->end_sector = p[6] & 0x3f;
Max Reitzac973932015-02-25 13:08:23 -0500172
Peter Maydell773dce32016-06-10 16:00:36 +0100173 r->start_sector_abs = ldl_le_p(p + 8);
174 r->nb_sectors_abs = ldl_le_p(p + 12);
bellard7a5ca862008-05-27 21:13:40 +0000175}
176
Max Reitz4c58e802014-11-18 12:21:19 +0100177static int find_partition(BlockBackend *blk, int partition,
bellard7a5ca862008-05-27 21:13:40 +0000178 off_t *offset, off_t *size)
179{
180 struct partition_record mbr[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600181 uint8_t data[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000182 int i;
183 int ext_partnum = 4;
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900184 int ret;
bellard7a5ca862008-05-27 21:13:40 +0000185
Eric Blakebd31c212016-05-06 10:26:42 -0600186 ret = blk_pread(blk, 0, data, sizeof(data));
187 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100188 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100189 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900190 }
bellard7a5ca862008-05-27 21:13:40 +0000191
192 if (data[510] != 0x55 || data[511] != 0xaa) {
Paolo Bonzini185b4332012-03-05 08:56:10 +0100193 return -EINVAL;
bellard7a5ca862008-05-27 21:13:40 +0000194 }
195
196 for (i = 0; i < 4; i++) {
197 read_partition(&data[446 + 16 * i], &mbr[i]);
198
Max Reitz453b07b2015-02-25 13:08:15 -0500199 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000200 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500201 }
bellard7a5ca862008-05-27 21:13:40 +0000202
203 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
204 struct partition_record ext[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600205 uint8_t data1[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000206 int j;
207
Eric Blakebd31c212016-05-06 10:26:42 -0600208 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
209 data1, sizeof(data1));
210 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100211 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100212 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900213 }
bellard7a5ca862008-05-27 21:13:40 +0000214
215 for (j = 0; j < 4; j++) {
216 read_partition(&data1[446 + 16 * j], &ext[j]);
Max Reitz453b07b2015-02-25 13:08:15 -0500217 if (!ext[j].system || !ext[j].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000218 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500219 }
bellard7a5ca862008-05-27 21:13:40 +0000220
221 if ((ext_partnum + j + 1) == partition) {
222 *offset = (uint64_t)ext[j].start_sector_abs << 9;
223 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
224 return 0;
225 }
226 }
227 ext_partnum += 4;
228 } else if ((i + 1) == partition) {
229 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
230 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
231 return 0;
232 }
233 }
234
Paolo Bonzini185b4332012-03-05 08:56:10 +0100235 return -ENOENT;
bellard7a5ca862008-05-27 21:13:40 +0000236}
237
Paolo Bonzinibb345112011-11-04 15:51:19 +0100238static void termsig_handler(int signum)
239{
Pavel Butsykin23994a52016-04-14 13:20:15 +0300240 atomic_cmpxchg(&state, RUNNING, TERMINATE);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200241 qemu_notify_event();
Paolo Bonzinibb345112011-11-04 15:51:19 +0100242}
243
Paolo Bonzini537b41f2014-02-17 14:43:51 +0100244
Eric Blake3c1fa352018-12-15 07:53:08 -0600245#if HAVE_NBD_DEVICE
Paolo Bonzinia517e882011-11-04 15:51:21 +0100246static void *show_parts(void *arg)
thscd831bd2008-07-03 10:23:51 +0000247{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100248 char *device = arg;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100249 int nbd;
thscd831bd2008-07-03 10:23:51 +0000250
Paolo Bonzinia517e882011-11-04 15:51:21 +0100251 /* linux just needs an open() to trigger
252 * the partition table update
253 * but remember to load the module with max_part != 0 :
254 * modprobe nbd max_part=63
255 */
256 nbd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100257 if (nbd >= 0) {
Paolo Bonzinia517e882011-11-04 15:51:21 +0100258 close(nbd);
thscd831bd2008-07-03 10:23:51 +0000259 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100260 return NULL;
261}
262
263static void *nbd_client_thread(void *arg)
264{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100265 char *device = arg;
Eric Blake081dd1f2017-07-07 15:30:49 -0500266 NBDExportInfo info = { .request_sizes = false, };
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000267 QIOChannelSocket *sioc;
268 int fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100269 int ret;
270 pthread_t show_parts_thread;
Max Reitz1ce52842015-01-26 21:02:59 -0500271 Error *local_error = NULL;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100272
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000273 sioc = qio_channel_socket_new();
274 if (qio_channel_socket_connect_sync(sioc,
275 saddr,
276 &local_error) < 0) {
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100277 error_report_err(local_error);
Stefan Hajnoczidc10e8b2012-01-05 13:16:07 +0000278 goto out;
279 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100280
Eric Blake004a89f2017-07-07 15:30:41 -0500281 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL,
282 NULL, NULL, NULL, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100283 if (ret < 0) {
Max Reitz1ce52842015-01-26 21:02:59 -0500284 if (local_error) {
Markus Armbruster78288672015-12-18 16:35:07 +0100285 error_report_err(local_error);
Max Reitz1ce52842015-01-26 21:02:59 -0500286 }
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100287 goto out_socket;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100288 }
289
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100290 fd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100291 if (fd < 0) {
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100292 /* Linux-only, we can use %m in printf. */
Markus Armbrusterb9884682015-12-18 16:35:18 +0100293 error_report("Failed to open %s: %m", device);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100294 goto out_socket;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100295 }
296
Eric Blake004a89f2017-07-07 15:30:41 -0500297 ret = nbd_init(fd, sioc, &info, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100298 if (ret < 0) {
Vladimir Sementsov-Ogievskiybe41c102017-05-26 14:09:13 +0300299 error_report_err(local_error);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100300 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100301 }
302
303 /* update partition table */
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100304 pthread_create(&show_parts_thread, NULL, show_parts, device);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100305
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100306 if (verbose) {
307 fprintf(stderr, "NBD device %s is now connected to %s\n",
308 device, srcpath);
309 } else {
310 /* Close stderr so that the qemu-nbd process exits. */
311 dup2(STDOUT_FILENO, STDERR_FILENO);
312 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100313
314 ret = nbd_client(fd);
315 if (ret) {
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100316 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100317 }
318 close(fd);
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000319 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100320 kill(getpid(), SIGTERM);
321 return (void *) EXIT_SUCCESS;
322
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100323out_fd:
324 close(fd);
325out_socket:
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000326 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100327out:
328 kill(getpid(), SIGTERM);
329 return (void *) EXIT_FAILURE;
thscd831bd2008-07-03 10:23:51 +0000330}
Eric Blake3c1fa352018-12-15 07:53:08 -0600331#endif /* HAVE_NBD_DEVICE */
thscd831bd2008-07-03 10:23:51 +0000332
Fam Zhenge4afbf42015-05-19 10:50:59 +0000333static int nbd_can_accept(void)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200334{
Eric Blakedf8ad9f2017-05-26 22:04:21 -0500335 return state == RUNNING && nb_fds < shared;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200336}
337
Paolo Bonzini7860a382012-09-18 13:31:56 +0200338static void nbd_export_closed(NBDExport *exp)
339{
340 assert(state == TERMINATING);
341 state = TERMINATED;
342}
343
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000344static void nbd_update_server_watch(void);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000345
Eric Blake0c9390d2017-06-08 17:26:17 -0500346static void nbd_client_closed(NBDClient *client, bool negotiated)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200347{
Paolo Bonzini1743b512011-09-19 14:33:23 +0200348 nb_fds--;
Eric Blake0c9390d2017-06-08 17:26:17 -0500349 if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
Paolo Bonzini7860a382012-09-18 13:31:56 +0200350 state = TERMINATE;
351 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000352 nbd_update_server_watch();
Paolo Bonzini7860a382012-09-18 13:31:56 +0200353 nbd_client_put(client);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200354}
355
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000356static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
357 gpointer opaque)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200358{
Paolo Bonzini7860a382012-09-18 13:31:56 +0200359 if (state >= TERMINATE) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000360 return;
Paolo Bonzini7860a382012-09-18 13:31:56 +0200361 }
362
Fam Zhengee7d7aa2016-01-14 16:41:01 +0800363 nb_fds++;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000364 nbd_update_server_watch();
Vladimir Sementsov-Ogievskiy7f7dfe22018-10-03 20:02:28 +0300365 nbd_client_new(cioc, tlscreds, NULL, nbd_client_closed);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200366}
367
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000368static void nbd_update_server_watch(void)
Fam Zhenge4afbf42015-05-19 10:50:59 +0000369{
370 if (nbd_can_accept()) {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000371 qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000372 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000373 qio_net_listener_set_client_func(server, NULL, NULL, NULL);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000374 }
375}
376
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100377
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200378static SocketAddress *nbd_build_socket_address(const char *sockpath,
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100379 const char *bindto,
380 const char *port)
381{
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200382 SocketAddress *saddr;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100383
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200384 saddr = g_new0(SocketAddress, 1);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100385 if (sockpath) {
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200386 saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
387 saddr->u.q_unix.path = g_strdup(sockpath);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100388 } else {
Eric Blake03992932016-03-03 09:16:48 -0700389 InetSocketAddress *inet;
Markus Armbrusterbd269eb2017-04-26 09:36:41 +0200390 saddr->type = SOCKET_ADDRESS_TYPE_INET;
391 inet = &saddr->u.inet;
Eric Blake03992932016-03-03 09:16:48 -0700392 inet->host = g_strdup(bindto);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100393 if (port) {
Eric Blake03992932016-03-03 09:16:48 -0700394 inet->port = g_strdup(port);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100395 } else {
Eric Blake03992932016-03-03 09:16:48 -0700396 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100397 }
398 }
399
400 return saddr;
401}
402
403
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000404static QemuOptsList file_opts = {
405 .name = "file",
406 .implied_opt_name = "file",
407 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
408 .desc = {
409 /* no elements => accept any params */
410 { /* end of list */ }
411 },
412};
413
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000414static QemuOptsList qemu_object_opts = {
415 .name = "object",
416 .implied_opt_name = "qom-type",
417 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
418 .desc = {
419 { }
420 },
421};
422
423
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000424
425static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
426{
427 Object *obj;
428 QCryptoTLSCreds *creds;
429
430 obj = object_resolve_path_component(
431 object_get_objects_root(), id);
432 if (!obj) {
433 error_setg(errp, "No TLS credentials with id '%s'",
434 id);
435 return NULL;
436 }
437 creds = (QCryptoTLSCreds *)
438 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
439 if (!creds) {
440 error_setg(errp, "Object with id '%s' is not TLS credentials",
441 id);
442 return NULL;
443 }
444
445 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
446 error_setg(errp,
447 "Expecting TLS credentials with a server endpoint");
448 return NULL;
449 }
450 object_ref(obj);
451 return creds;
452}
453
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000454static void setup_address_and_port(const char **address, const char **port)
455{
456 if (*address == NULL) {
457 *address = "0.0.0.0";
458 }
459
460 if (*port == NULL) {
461 *port = stringify(NBD_DEFAULT_PORT);
462 }
463}
464
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000465/*
466 * Check socket parameters compatibility when socket activation is used.
467 */
468static const char *socket_activation_validate_opts(const char *device,
469 const char *sockpath,
470 const char *address,
471 const char *port)
472{
473 if (device != NULL) {
474 return "NBD device can't be set when using socket activation";
475 }
476
477 if (sockpath != NULL) {
478 return "Unix socket can't be set when using socket activation";
479 }
480
481 if (address != NULL) {
482 return "The interface can't be set when using socket activation";
483 }
484
485 if (port != NULL) {
486 return "TCP port number can't be set when using socket activation";
487 }
488
489 return NULL;
490}
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000491
Kevin Wolfb3b52992018-05-16 13:46:37 +0200492static void qemu_nbd_shutdown(void)
493{
494 job_cancel_sync_all();
495 bdrv_close_all();
496}
497
bellard7a5ca862008-05-27 21:13:40 +0000498int main(int argc, char **argv)
499{
Markus Armbruster26f54e92014-10-07 13:59:04 +0200500 BlockBackend *blk;
bellard7a5ca862008-05-27 21:13:40 +0000501 BlockDriverState *bs;
502 off_t dev_offset = 0;
Eric Blake7423f412016-07-21 13:34:46 -0600503 uint16_t nbdflags = 0;
thscd831bd2008-07-03 10:23:51 +0000504 bool disconnect = false;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000505 const char *bindto = NULL;
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100506 const char *port = NULL;
507 char *sockpath = NULL;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100508 char *device = NULL;
bellard7a5ca862008-05-27 21:13:40 +0000509 off_t fd_size;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800510 QemuOpts *sn_opts = NULL;
511 const char *sn_id_or_name = NULL;
Eric Blakeb1a75b32016-10-14 13:33:03 -0500512 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
bellard7a5ca862008-05-27 21:13:40 +0000513 struct option lopt[] = {
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000514 { "help", no_argument, NULL, 'h' },
515 { "version", no_argument, NULL, 'V' },
516 { "bind", required_argument, NULL, 'b' },
517 { "port", required_argument, NULL, 'p' },
518 { "socket", required_argument, NULL, 'k' },
519 { "offset", required_argument, NULL, 'o' },
520 { "read-only", no_argument, NULL, 'r' },
521 { "partition", required_argument, NULL, 'P' },
522 { "connect", required_argument, NULL, 'c' },
523 { "disconnect", no_argument, NULL, 'd' },
524 { "snapshot", no_argument, NULL, 's' },
525 { "load-snapshot", required_argument, NULL, 'l' },
526 { "nocache", no_argument, NULL, 'n' },
527 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
528 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
529 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
530 { "detect-zeroes", required_argument, NULL,
531 QEMU_NBD_OPT_DETECT_ZEROES },
532 { "shared", required_argument, NULL, 'e' },
533 { "format", required_argument, NULL, 'f' },
534 { "persistent", no_argument, NULL, 't' },
535 { "verbose", no_argument, NULL, 'v' },
536 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
537 { "export-name", required_argument, NULL, 'x' },
Eric Blakeb1a75b32016-10-14 13:33:03 -0500538 { "description", required_argument, NULL, 'D' },
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000539 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
540 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300541 { "trace", required_argument, NULL, 'T' },
Max Reitzffb31e12016-09-28 22:46:42 +0200542 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
Blue Swirl660f11b2009-07-31 21:16:51 +0000543 { NULL, 0, NULL, 0 }
bellard7a5ca862008-05-27 21:13:40 +0000544 };
545 int ch;
546 int opt_ind = 0;
bellard7a5ca862008-05-27 21:13:40 +0000547 char *end;
Naphtali Spreif5edb012010-01-17 16:48:13 +0200548 int flags = BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000549 int partition = -1;
Max Reitz4fbec262015-02-05 13:58:19 -0500550 int ret = 0;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200551 bool seen_cache = false;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100552 bool seen_discard = false;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200553 bool seen_aio = false;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100554 pthread_t client_thread;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000555 const char *fmt = NULL;
Max Reitz34b5d2c2013-09-05 14:45:29 +0200556 Error *local_err = NULL;
Peter Lievenb3838a42014-08-13 19:20:18 +0200557 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
Max Reitz4fbec262015-02-05 13:58:19 -0500558 QDict *options = NULL;
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +0300559 const char *export_name = ""; /* Default export name */
Eric Blakeb1a75b32016-10-14 13:33:03 -0500560 const char *export_description = NULL;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000561 const char *tlscredsid = NULL;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000562 bool imageOpts = false;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100563 bool writethrough = true;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300564 char *trace_file = NULL;
Max Reitzffb31e12016-09-28 22:46:42 +0200565 bool fork_process = false;
566 int old_stderr = -1;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000567 unsigned socket_activation;
bellard7a5ca862008-05-27 21:13:40 +0000568
Paolo Bonzinia517e882011-11-04 15:51:21 +0100569 /* The client thread uses SIGTERM to interrupt the server. A signal
570 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
571 */
Paolo Bonzinibb345112011-11-04 15:51:19 +0100572 struct sigaction sa_sigterm;
Paolo Bonzinibb345112011-11-04 15:51:19 +0100573 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
574 sa_sigterm.sa_handler = termsig_handler;
575 sigaction(SIGTERM, &sa_sigterm, NULL);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100576
Max Reitz041e32b2017-06-11 14:37:14 +0200577#ifdef CONFIG_POSIX
578 signal(SIGPIPE, SIG_IGN);
579#endif
580
Daniel P. Berrangefe4db842016-10-04 14:35:52 +0100581 module_call_init(MODULE_INIT_TRACE);
Eric Blake3ba1b7b2018-12-15 07:53:03 -0600582 error_set_progname(argv[0]);
Eduardo Habkoste8f2d272016-05-12 11:10:04 -0300583 qcrypto_init(&error_fatal);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100584
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000585 module_call_init(MODULE_INIT_QOM);
586 qemu_add_opts(&qemu_object_opts);
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300587 qemu_add_opts(&qemu_trace_opts);
Fam Zheng10f5bff2014-02-10 14:48:51 +0800588 qemu_init_exec_dir(argv[0]);
Paolo Bonzinibb345112011-11-04 15:51:19 +0100589
bellard7a5ca862008-05-27 21:13:40 +0000590 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
591 switch (ch) {
592 case 's':
ths2f726482008-07-03 11:47:46 +0000593 flags |= BDRV_O_SNAPSHOT;
594 break;
595 case 'n':
Paolo Bonzini39a52352012-07-18 14:57:15 +0200596 optarg = (char *) "none";
597 /* fallthrough */
598 case QEMU_NBD_OPT_CACHE:
599 if (seen_cache) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100600 error_report("-n and --cache can only be specified once");
601 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200602 }
603 seen_cache = true;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100604 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100605 error_report("Invalid cache mode `%s'", optarg);
606 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200607 }
bellard7a5ca862008-05-27 21:13:40 +0000608 break;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200609 case QEMU_NBD_OPT_AIO:
610 if (seen_aio) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100611 error_report("--aio can only be specified once");
612 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200613 }
614 seen_aio = true;
615 if (!strcmp(optarg, "native")) {
616 flags |= BDRV_O_NATIVE_AIO;
617 } else if (!strcmp(optarg, "threads")) {
618 /* this is the default */
619 } else {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100620 error_report("invalid aio mode `%s'", optarg);
621 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200622 }
623 break;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100624 case QEMU_NBD_OPT_DISCARD:
625 if (seen_discard) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100626 error_report("--discard can only be specified once");
627 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100628 }
629 seen_discard = true;
630 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100631 error_report("Invalid discard mode `%s'", optarg);
632 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100633 }
634 break;
Peter Lievenb3838a42014-08-13 19:20:18 +0200635 case QEMU_NBD_OPT_DETECT_ZEROES:
636 detect_zeroes =
Marc-André Lureauf7abe0e2017-08-24 10:46:10 +0200637 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
Peter Lievenb3838a42014-08-13 19:20:18 +0200638 optarg,
Peter Lievenb3838a42014-08-13 19:20:18 +0200639 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
640 &local_err);
641 if (local_err) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100642 error_reportf_err(local_err,
643 "Failed to parse detect_zeroes mode: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100644 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200645 }
646 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
647 !(flags & BDRV_O_UNMAP)) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100648 error_report("setting detect-zeroes to unmap is not allowed "
649 "without setting discard operation to unmap");
650 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200651 }
652 break;
bellard7a5ca862008-05-27 21:13:40 +0000653 case 'b':
654 bindto = optarg;
655 break;
656 case 'p':
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100657 port = optarg;
bellard7a5ca862008-05-27 21:13:40 +0000658 break;
659 case 'o':
660 dev_offset = strtoll (optarg, &end, 0);
661 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100662 error_report("Invalid offset `%s'", optarg);
663 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000664 }
665 if (dev_offset < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100666 error_report("Offset must be positive `%s'", optarg);
667 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000668 }
669 break;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800670 case 'l':
671 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
Markus Armbruster70b94332015-02-13 12:50:26 +0100672 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
673 optarg, false);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800674 if (!sn_opts) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100675 error_report("Failed in parsing snapshot param `%s'",
676 optarg);
677 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800678 }
679 } else {
680 sn_id_or_name = optarg;
681 }
682 /* fall through */
bellard7a5ca862008-05-27 21:13:40 +0000683 case 'r':
Paolo Bonzinib90fb4b2011-09-08 17:24:54 +0200684 nbdflags |= NBD_FLAG_READ_ONLY;
Naphtali Sprei07108b22010-03-14 15:19:57 +0200685 flags &= ~BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000686 break;
687 case 'P':
688 partition = strtol(optarg, &end, 0);
Peter Lieven713cc672014-08-13 19:20:19 +0200689 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100690 error_report("Invalid partition `%s'", optarg);
691 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200692 }
693 if (partition < 1 || partition > 8) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100694 error_report("Invalid partition %d", partition);
695 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200696 }
bellard7a5ca862008-05-27 21:13:40 +0000697 break;
thscd831bd2008-07-03 10:23:51 +0000698 case 'k':
Paolo Bonzinib32f6c22011-11-04 15:51:20 +0100699 sockpath = optarg;
Peter Lieven713cc672014-08-13 19:20:19 +0200700 if (sockpath[0] != '/') {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100701 error_report("socket path must be absolute");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100702 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200703 }
thscd831bd2008-07-03 10:23:51 +0000704 break;
705 case 'd':
706 disconnect = true;
707 break;
708 case 'c':
709 device = optarg;
710 break;
ths3b05a8e2008-07-03 12:45:02 +0000711 case 'e':
712 shared = strtol(optarg, &end, 0);
713 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100714 error_report("Invalid shared device number '%s'", optarg);
715 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000716 }
717 if (shared < 1) {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100718 error_report("Shared device number must be greater than 0");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100719 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000720 }
721 break;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000722 case 'f':
723 fmt = optarg;
724 break;
Peter Lieven713cc672014-08-13 19:20:19 +0200725 case 't':
726 persistent = 1;
727 break;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000728 case 'x':
729 export_name = optarg;
730 break;
Eric Blakeb1a75b32016-10-14 13:33:03 -0500731 case 'D':
732 export_description = optarg;
733 break;
bellard7a5ca862008-05-27 21:13:40 +0000734 case 'v':
735 verbose = 1;
736 break;
737 case 'V':
738 version(argv[0]);
739 exit(0);
740 break;
741 case 'h':
742 usage(argv[0]);
743 exit(0);
744 break;
745 case '?':
Markus Armbruster85b01e02015-12-18 16:35:04 +0100746 error_report("Try `%s --help' for more information.", argv[0]);
747 exit(EXIT_FAILURE);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000748 case QEMU_NBD_OPT_OBJECT: {
749 QemuOpts *opts;
750 opts = qemu_opts_parse_noisily(&qemu_object_opts,
751 optarg, true);
752 if (!opts) {
753 exit(EXIT_FAILURE);
754 }
755 } break;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000756 case QEMU_NBD_OPT_TLSCREDS:
757 tlscredsid = optarg;
758 break;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000759 case QEMU_NBD_OPT_IMAGE_OPTS:
760 imageOpts = true;
761 break;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300762 case 'T':
763 g_free(trace_file);
764 trace_file = trace_opt_parse(optarg);
765 break;
Max Reitzffb31e12016-09-28 22:46:42 +0200766 case QEMU_NBD_OPT_FORK:
767 fork_process = true;
768 break;
bellard7a5ca862008-05-27 21:13:40 +0000769 }
770 }
771
772 if ((argc - optind) != 1) {
Markus Armbruster433672b2015-12-18 16:35:24 +0100773 error_report("Invalid number of arguments");
774 error_printf("Try `%s --help' for more information.\n", argv[0]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100775 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000776 }
777
Markus Armbruster7e1e0c12018-10-17 10:26:43 +0200778 qemu_opts_foreach(&qemu_object_opts,
779 user_creatable_add_opts_foreach,
780 NULL, &error_fatal);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000781
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300782 if (!trace_init_backends()) {
783 exit(1);
784 }
785 trace_init_file(trace_file);
786 qemu_set_log(LOG_TRACE);
787
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000788 socket_activation = check_socket_activation();
789 if (socket_activation == 0) {
790 setup_address_and_port(&bindto, &port);
791 } else {
792 /* Using socket activation - check user didn't use -p etc. */
793 const char *err_msg = socket_activation_validate_opts(device, sockpath,
794 bindto, port);
795 if (err_msg != NULL) {
796 error_report("%s", err_msg);
797 exit(EXIT_FAILURE);
798 }
Paolo Bonzini53fabd42017-03-16 16:29:45 +0100799
800 /* qemu-nbd can only listen on a single socket. */
801 if (socket_activation > 1) {
802 error_report("qemu-nbd does not support socket activation with %s > 1",
803 "LISTEN_FDS");
804 exit(EXIT_FAILURE);
805 }
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000806 }
807
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000808 if (tlscredsid) {
809 if (sockpath) {
810 error_report("TLS is only supported with IPv4/IPv6");
811 exit(EXIT_FAILURE);
812 }
813 if (device) {
814 error_report("TLS is not supported with a host device");
815 exit(EXIT_FAILURE);
816 }
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000817 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
818 if (local_err) {
819 error_report("Failed to get TLS creds %s",
820 error_get_pretty(local_err));
821 exit(EXIT_FAILURE);
822 }
823 }
824
Eric Blake3c1fa352018-12-15 07:53:08 -0600825#if !HAVE_NBD_DEVICE
826 if (disconnect || device) {
827 error_report("Kernel /dev/nbdN support not available");
828 exit(EXIT_FAILURE);
829 }
830#else /* HAVE_NBD_DEVICE */
thscd831bd2008-07-03 10:23:51 +0000831 if (disconnect) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000832 int nbdfd = open(argv[optind], O_RDWR);
833 if (nbdfd < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100834 error_report("Cannot open %s: %s", argv[optind],
835 strerror(errno));
836 exit(EXIT_FAILURE);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100837 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000838 nbd_disconnect(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000839
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000840 close(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000841
842 printf("%s disconnected\n", argv[optind]);
843
Peter Lieven713cc672014-08-13 19:20:19 +0200844 return 0;
thscd831bd2008-07-03 10:23:51 +0000845 }
Eric Blake3c1fa352018-12-15 07:53:08 -0600846#endif
thscd831bd2008-07-03 10:23:51 +0000847
Max Reitzffb31e12016-09-28 22:46:42 +0200848 if ((device && !verbose) || fork_process) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100849 int stderr_fd[2];
850 pid_t pid;
851 int ret;
852
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100853 if (qemu_pipe(stderr_fd) < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100854 error_report("Error setting up communication pipe: %s",
855 strerror(errno));
856 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100857 }
858
859 /* Now daemonize, but keep a communication channel open to
860 * print errors and exit with the proper status code.
861 */
862 pid = fork();
Max Reitz70d47392015-02-25 13:08:22 -0500863 if (pid < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100864 error_report("Failed to fork: %s", strerror(errno));
865 exit(EXIT_FAILURE);
Max Reitz70d47392015-02-25 13:08:22 -0500866 } else if (pid == 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100867 close(stderr_fd[0]);
Michael Tokarev9faf31b2012-01-16 18:37:44 +0400868 ret = qemu_daemon(1, 0);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100869
870 /* Temporarily redirect stderr to the parent's pipe... */
Max Reitzffb31e12016-09-28 22:46:42 +0200871 old_stderr = dup(STDERR_FILENO);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100872 dup2(stderr_fd[1], STDERR_FILENO);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100873 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100874 error_report("Failed to daemonize: %s", strerror(errno));
875 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100876 }
877
878 /* ... close the descriptor we inherited and go on. */
879 close(stderr_fd[1]);
880 } else {
881 bool errors = false;
882 char *buf;
883
884 /* In the parent. Print error messages from the child until
885 * it closes the pipe.
886 */
887 close(stderr_fd[1]);
888 buf = g_malloc(1024);
889 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
890 errors = true;
891 ret = qemu_write_full(STDERR_FILENO, buf, ret);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100892 if (ret < 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100893 exit(EXIT_FAILURE);
894 }
895 }
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100896 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100897 error_report("Cannot read from daemon: %s",
898 strerror(errno));
899 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100900 }
901
902 /* Usually the daemon should not print any message.
903 * Exit with zero status in that case.
904 */
905 exit(errors);
906 }
907 }
908
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100909 if (device != NULL && sockpath == NULL) {
910 sockpath = g_malloc(128);
911 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
thscd831bd2008-07-03 10:23:51 +0000912 }
913
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000914 server = qio_net_listener_new();
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000915 if (socket_activation == 0) {
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000916 saddr = nbd_build_socket_address(sockpath, bindto, port);
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000917 if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) {
918 object_unref(OBJECT(server));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000919 error_report_err(local_err);
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000920 exit(EXIT_FAILURE);
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000921 }
922 } else {
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000923 size_t i;
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000924 /* See comment in check_socket_activation above. */
Daniel P. Berrangee4849c12017-12-18 10:16:43 +0000925 for (i = 0; i < socket_activation; i++) {
926 QIOChannelSocket *sioc;
927 sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i,
928 &local_err);
929 if (sioc == NULL) {
930 object_unref(OBJECT(server));
931 error_report("Failed to use socket activation: %s",
932 error_get_pretty(local_err));
933 exit(EXIT_FAILURE);
934 }
935 qio_net_listener_add(server, sioc);
936 object_unref(OBJECT(sioc));
Richard W.M. Jonesa721f532017-02-04 10:03:17 +0000937 }
938 }
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100939
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300940 if (qemu_init_main_loop(&local_err)) {
Markus Armbruster565f65d2015-02-12 13:55:05 +0100941 error_report_err(local_err);
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300942 exit(EXIT_FAILURE);
943 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100944 bdrv_init();
Kevin Wolfb3b52992018-05-16 13:46:37 +0200945 atexit(qemu_nbd_shutdown);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100946
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000947 srcpath = argv[optind];
948 if (imageOpts) {
949 QemuOpts *opts;
950 if (fmt) {
951 error_report("--image-opts and -f are mutually exclusive");
952 exit(EXIT_FAILURE);
953 }
954 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
955 if (!opts) {
956 qemu_opts_reset(&file_opts);
957 exit(EXIT_FAILURE);
958 }
959 options = qemu_opts_to_qdict(opts, NULL);
960 qemu_opts_reset(&file_opts);
Max Reitzefaa7c42016-03-16 19:54:38 +0100961 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000962 } else {
963 if (fmt) {
964 options = qdict_new();
Eric Blake46f5ac22017-04-27 16:58:17 -0500965 qdict_put_str(options, "driver", fmt);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000966 }
Max Reitzefaa7c42016-03-16 19:54:38 +0100967 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000968 }
969
Max Reitz4fbec262015-02-05 13:58:19 -0500970 if (!blk) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100971 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
972 argv[optind]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100973 exit(EXIT_FAILURE);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100974 }
Max Reitz4fbec262015-02-05 13:58:19 -0500975 bs = blk_bs(blk);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100976
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100977 blk_set_enable_write_cache(blk, !writethrough);
978
Wenchao Xia8c116b02013-12-04 17:10:55 +0800979 if (sn_opts) {
980 ret = bdrv_snapshot_load_tmp(bs,
981 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
982 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
983 &local_err);
984 } else if (sn_id_or_name) {
985 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
986 &local_err);
987 }
988 if (ret < 0) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100989 error_reportf_err(local_err, "Failed to load snapshot: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100990 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800991 }
992
Peter Lievenb3838a42014-08-13 19:20:18 +0200993 bs->detect_zeroes = detect_zeroes;
Max Reitz4c58e802014-11-18 12:21:19 +0100994 fd_size = blk_getlength(blk);
Max Reitz98f44bb2015-02-25 13:08:21 -0500995 if (fd_size < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100996 error_report("Failed to determine the image length: %s",
997 strerror(-fd_size));
998 exit(EXIT_FAILURE);
Max Reitz98f44bb2015-02-25 13:08:21 -0500999 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001000
Tomáš Golembiovskýe424b652016-10-05 23:40:20 +02001001 if (dev_offset >= fd_size) {
1002 error_report("Offset (%lld) has to be smaller than the image size "
1003 "(%lld)",
1004 (long long int)dev_offset, (long long int)fd_size);
1005 exit(EXIT_FAILURE);
1006 }
1007 fd_size -= dev_offset;
1008
Paolo Bonzini185b4332012-03-05 08:56:10 +01001009 if (partition != -1) {
Max Reitz4c58e802014-11-18 12:21:19 +01001010 ret = find_partition(blk, partition, &dev_offset, &fd_size);
Paolo Bonzini185b4332012-03-05 08:56:10 +01001011 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001012 error_report("Could not find partition %d: %s", partition,
Markus Armbrustera4699e52015-12-18 16:35:10 +01001013 strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +01001014 exit(EXIT_FAILURE);
Paolo Bonzini185b4332012-03-05 08:56:10 +01001015 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +01001016 }
1017
Kevin Wolfcd7fca92016-07-06 11:22:39 +02001018 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
Markus Armbruster50beeb62018-10-17 10:26:26 +02001019 writethrough, NULL, &error_fatal);
Vladimir Sementsov-Ogievskiyf5cd0bb2018-10-03 20:02:27 +03001020 nbd_export_set_name(exp, export_name);
1021 nbd_export_set_description(exp, export_description);
ths3b05a8e2008-07-03 12:45:02 +00001022
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001023 if (device) {
Eric Blake3c1fa352018-12-15 07:53:08 -06001024#if HAVE_NBD_DEVICE
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001025 int ret;
1026
Paolo Bonzinia6ac2312011-12-06 09:07:00 +01001027 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001028 if (ret != 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001029 error_report("Failed to create client thread: %s", strerror(ret));
1030 exit(EXIT_FAILURE);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001031 }
Eric Blake3c1fa352018-12-15 07:53:08 -06001032#endif
Paolo Bonzinif1ef5552011-11-04 15:51:23 +01001033 } else {
1034 /* Shut up GCC warnings. */
1035 memset(&client_thread, 0, sizeof(client_thread));
1036 }
1037
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +00001038 nbd_update_server_watch();
bellard7a5ca862008-05-27 21:13:40 +00001039
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001040 /* now when the initialization is (almost) complete, chdir("/")
1041 * to free any busy filesystems */
1042 if (chdir("/") < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +01001043 error_report("Could not chdir to root directory: %s",
1044 strerror(errno));
1045 exit(EXIT_FAILURE);
Michael Tokarev9faf31b2012-01-16 18:37:44 +04001046 }
1047
Max Reitzffb31e12016-09-28 22:46:42 +02001048 if (fork_process) {
1049 dup2(old_stderr, STDERR_FILENO);
1050 close(old_stderr);
1051 }
1052
Paolo Bonzini7860a382012-09-18 13:31:56 +02001053 state = RUNNING;
ths3b05a8e2008-07-03 12:45:02 +00001054 do {
Paolo Bonzinia61c6782011-09-12 17:28:11 +02001055 main_loop_wait(false);
Paolo Bonzini7860a382012-09-18 13:31:56 +02001056 if (state == TERMINATE) {
1057 state = TERMINATING;
1058 nbd_export_close(exp);
1059 nbd_export_put(exp);
1060 exp = NULL;
1061 }
1062 } while (state != TERMINATED);
ths3b05a8e2008-07-03 12:45:02 +00001063
Markus Armbruster26f54e92014-10-07 13:59:04 +02001064 blk_unref(blk);
Paolo Bonzinib32f6c22011-11-04 15:51:20 +01001065 if (sockpath) {
1066 unlink(sockpath);
1067 }
bellard7a5ca862008-05-27 21:13:40 +00001068
Markus Armbrusterfbf28a42014-09-29 16:07:55 +02001069 qemu_opts_del(sn_opts);
Wenchao Xia8c116b02013-12-04 17:10:55 +08001070
Paolo Bonzinia517e882011-11-04 15:51:21 +01001071 if (device) {
1072 void *ret;
1073 pthread_join(client_thread, &ret);
1074 exit(ret != NULL);
1075 } else {
1076 exit(EXIT_SUCCESS);
1077 }
bellard7a5ca862008-05-27 21:13:40 +00001078}