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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"
Markus Armbrusterda34e652016-03-14 09:01:28 +010020#include "qapi/error.h"
Stefan Weil5a61cb62011-09-08 17:55:32 +020021#include "qemu-common.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020022#include "qemu/cutils.h"
Markus Armbruster26f54e92014-10-07 13:59:04 +020023#include "sysemu/block-backend.h"
Peter Lievenb3838a42014-08-13 19:20:18 +020024#include "block/block_int.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010025#include "block/nbd.h"
Alex Bligh6a1751b2013-08-21 16:02:47 +010026#include "qemu/main-loop.h"
Paolo Bonzini537b41f2014-02-17 14:43:51 +010027#include "qemu/error-report.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000028#include "qemu/config-file.h"
Paolo Bonzini58369e22016-03-15 17:22:36 +010029#include "qemu/bswap.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030030#include "qemu/log.h"
Wenchao Xia8c116b02013-12-04 17:10:55 +080031#include "block/snapshot.h"
Peter Lievenb3838a42014-08-13 19:20:18 +020032#include "qapi/util.h"
Markus Armbrusterd49b6832015-03-17 18:29:20 +010033#include "qapi/qmp/qstring.h"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000034#include "qom/object_interfaces.h"
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +000035#include "io/channel-socket.h"
Daniel P. Berrangec2297082016-04-06 12:12:06 +010036#include "crypto/init.h"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030037#include "trace/control.h"
bellard7a5ca862008-05-27 21:13:40 +000038
bellard7a5ca862008-05-27 21:13:40 +000039#include <getopt.h>
Blue Swirl2bff4b62009-12-23 15:34:04 +000040#include <libgen.h>
Paolo Bonzinia517e882011-11-04 15:51:21 +010041#include <pthread.h>
thscd831bd2008-07-03 10:23:51 +000042
Peter Lieven713cc672014-08-13 19:20:19 +020043#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
Daniel P. Berrangefa8b7ce2016-02-17 10:10:21 +000044#define QEMU_NBD_OPT_CACHE 256
45#define QEMU_NBD_OPT_AIO 257
46#define QEMU_NBD_OPT_DISCARD 258
47#define QEMU_NBD_OPT_DETECT_ZEROES 259
48#define QEMU_NBD_OPT_OBJECT 260
49#define QEMU_NBD_OPT_TLSCREDS 261
50#define QEMU_NBD_OPT_IMAGE_OPTS 262
Max Reitzffb31e12016-09-28 22:46:42 +020051#define QEMU_NBD_OPT_FORK 263
bellard7a5ca862008-05-27 21:13:40 +000052
Eric Blakebd31c212016-05-06 10:26:42 -060053#define MBR_SIZE 512
54
Paolo Bonziniaf49bbb2011-09-19 14:03:37 +020055static NBDExport *exp;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +000056static bool newproto;
blueswir1b1d8e522008-10-26 13:43:07 +000057static int verbose;
Paolo Bonzinia517e882011-11-04 15:51:21 +010058static char *srcpath;
Daniel P. Berrange48bec072015-09-16 14:52:23 +010059static SocketAddress *saddr;
Paolo Bonzini7860a382012-09-18 13:31:56 +020060static int persistent = 0;
61static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
Paolo Bonzinia61c6782011-09-12 17:28:11 +020062static int shared = 1;
63static int nb_fds;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +000064static QIOChannelSocket *server_ioc;
65static int server_watch = -1;
Daniel P. Berrange145614a2016-02-10 18:41:13 +000066static QCryptoTLSCreds *tlscreds;
bellard7a5ca862008-05-27 21:13:40 +000067
68static void usage(const char *name)
69{
Paolo Bonzinib033cd82012-07-18 14:50:52 +020070 (printf) (
bellard7a5ca862008-05-27 21:13:40 +000071"Usage: %s [OPTIONS] FILE\n"
72"QEMU Disk Network Block Device Server\n"
73"\n"
Peter Lieven713cc672014-08-13 19:20:19 +020074" -h, --help display this help and exit\n"
75" -V, --version output version information and exit\n"
bellard7a5ca862008-05-27 21:13:40 +000076"\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020077"Connection properties:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020078" -p, --port=PORT port to listen on (default `%d')\n"
79" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
80" -k, --socket=PATH path to the unix socket\n"
81" (default '"SOCKET_PATH"')\n"
82" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
83" -t, --persistent don't exit on the last connection\n"
84" -v, --verbose display extra debugging information\n"
Eric Blake332a2542016-04-05 20:02:08 -060085" -x, --export-name=NAME expose export by name\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020086"\n"
87"Exposing part of the image:\n"
Peter Lieven713cc672014-08-13 19:20:19 +020088" -o, --offset=OFFSET offset into the image\n"
89" -P, --partition=NUM only expose partition NUM\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020090"\n"
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +000091"General purpose options:\n"
92" --object type,id=ID,... define an object such as 'secret' for providing\n"
93" passwords and/or encryption keys\n"
Denis V. Lunev39ca4632016-06-17 17:44:12 +030094" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
95" specify tracing options\n"
Max Reitzffb31e12016-09-28 22:46:42 +020096" --fork fork off the server process and exit the parent\n"
97" once the server is running\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +020098#ifdef __linux__
99"Kernel NBD client support:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200100" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
101" -d, --disconnect disconnect the specified device\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200102"\n"
103#endif
104"\n"
105"Block device options:\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200106" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
107" -r, --read-only export read-only\n"
108" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
109" file with backing_file=FILE, redirect the write to\n"
110" the temporary one\n"
Wenchao Xia8c116b02013-12-04 17:10:55 +0800111" -l, --load-snapshot=SNAPSHOT_PARAM\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200112" load an internal snapshot inside FILE and export it\n"
113" as an read-only device, SNAPSHOT_PARAM format is\n"
114" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
115" '[ID_OR_NAME]'\n"
116" -n, --nocache disable host cache\n"
117" --cache=MODE set cache mode (none, writeback, ...)\n"
Peter Lieven713cc672014-08-13 19:20:19 +0200118" --aio=MODE set AIO mode (native or threads)\n"
Peter Lievenb3838a42014-08-13 19:20:18 +0200119" --discard=MODE set discard mode (ignore, unmap)\n"
Andrey Korolyov6883de62015-07-31 22:12:54 +0300120" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000121" --image-opts treat FILE as a full set of image options\n"
Paolo Bonzinib033cd82012-07-18 14:50:52 +0200122"\n"
123"Report bugs to <qemu-devel@nongnu.org>\n"
Laurent Vivierc2e28722010-09-17 20:37:25 +0200124 , name, NBD_DEFAULT_PORT, "DEVICE");
bellard7a5ca862008-05-27 21:13:40 +0000125}
126
127static void version(const char *name)
128{
129 printf(
ths315bc7a2008-07-18 18:06:23 +0000130"%s version 0.0.1\n"
bellard7a5ca862008-05-27 21:13:40 +0000131"Written by Anthony Liguori.\n"
132"\n"
133"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
134"This is free software; see the source for copying conditions. There is NO\n"
135"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
ths315bc7a2008-07-18 18:06:23 +0000136 , name);
bellard7a5ca862008-05-27 21:13:40 +0000137}
138
139struct partition_record
140{
141 uint8_t bootable;
142 uint8_t start_head;
143 uint32_t start_cylinder;
144 uint8_t start_sector;
145 uint8_t system;
146 uint8_t end_head;
147 uint8_t end_cylinder;
148 uint8_t end_sector;
149 uint32_t start_sector_abs;
150 uint32_t nb_sectors_abs;
151};
152
153static void read_partition(uint8_t *p, struct partition_record *r)
154{
155 r->bootable = p[0];
156 r->start_head = p[1];
157 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
158 r->start_sector = p[2] & 0x3f;
159 r->system = p[4];
160 r->end_head = p[5];
161 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
162 r->end_sector = p[6] & 0x3f;
Max Reitzac973932015-02-25 13:08:23 -0500163
Peter Maydell773dce32016-06-10 16:00:36 +0100164 r->start_sector_abs = ldl_le_p(p + 8);
165 r->nb_sectors_abs = ldl_le_p(p + 12);
bellard7a5ca862008-05-27 21:13:40 +0000166}
167
Max Reitz4c58e802014-11-18 12:21:19 +0100168static int find_partition(BlockBackend *blk, int partition,
bellard7a5ca862008-05-27 21:13:40 +0000169 off_t *offset, off_t *size)
170{
171 struct partition_record mbr[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600172 uint8_t data[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000173 int i;
174 int ext_partnum = 4;
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900175 int ret;
bellard7a5ca862008-05-27 21:13:40 +0000176
Eric Blakebd31c212016-05-06 10:26:42 -0600177 ret = blk_pread(blk, 0, data, sizeof(data));
178 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100179 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100180 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900181 }
bellard7a5ca862008-05-27 21:13:40 +0000182
183 if (data[510] != 0x55 || data[511] != 0xaa) {
Paolo Bonzini185b4332012-03-05 08:56:10 +0100184 return -EINVAL;
bellard7a5ca862008-05-27 21:13:40 +0000185 }
186
187 for (i = 0; i < 4; i++) {
188 read_partition(&data[446 + 16 * i], &mbr[i]);
189
Max Reitz453b07b2015-02-25 13:08:15 -0500190 if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000191 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500192 }
bellard7a5ca862008-05-27 21:13:40 +0000193
194 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
195 struct partition_record ext[4];
Eric Blakebd31c212016-05-06 10:26:42 -0600196 uint8_t data1[MBR_SIZE];
bellard7a5ca862008-05-27 21:13:40 +0000197 int j;
198
Eric Blakebd31c212016-05-06 10:26:42 -0600199 ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
200 data1, sizeof(data1));
201 if (ret < 0) {
Markus Armbrustera4699e52015-12-18 16:35:10 +0100202 error_report("error while reading: %s", strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100203 exit(EXIT_FAILURE);
Ryota Ozakicb7cf0e2010-05-03 06:50:25 +0900204 }
bellard7a5ca862008-05-27 21:13:40 +0000205
206 for (j = 0; j < 4; j++) {
207 read_partition(&data1[446 + 16 * j], &ext[j]);
Max Reitz453b07b2015-02-25 13:08:15 -0500208 if (!ext[j].system || !ext[j].nb_sectors_abs) {
bellard7a5ca862008-05-27 21:13:40 +0000209 continue;
Max Reitz453b07b2015-02-25 13:08:15 -0500210 }
bellard7a5ca862008-05-27 21:13:40 +0000211
212 if ((ext_partnum + j + 1) == partition) {
213 *offset = (uint64_t)ext[j].start_sector_abs << 9;
214 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
215 return 0;
216 }
217 }
218 ext_partnum += 4;
219 } else if ((i + 1) == partition) {
220 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
221 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
222 return 0;
223 }
224 }
225
Paolo Bonzini185b4332012-03-05 08:56:10 +0100226 return -ENOENT;
bellard7a5ca862008-05-27 21:13:40 +0000227}
228
Paolo Bonzinibb345112011-11-04 15:51:19 +0100229static void termsig_handler(int signum)
230{
Pavel Butsykin23994a52016-04-14 13:20:15 +0300231 atomic_cmpxchg(&state, RUNNING, TERMINATE);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200232 qemu_notify_event();
Paolo Bonzinibb345112011-11-04 15:51:19 +0100233}
234
Paolo Bonzini537b41f2014-02-17 14:43:51 +0100235
Paolo Bonzinia517e882011-11-04 15:51:21 +0100236static void *show_parts(void *arg)
thscd831bd2008-07-03 10:23:51 +0000237{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100238 char *device = arg;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100239 int nbd;
thscd831bd2008-07-03 10:23:51 +0000240
Paolo Bonzinia517e882011-11-04 15:51:21 +0100241 /* linux just needs an open() to trigger
242 * the partition table update
243 * but remember to load the module with max_part != 0 :
244 * modprobe nbd max_part=63
245 */
246 nbd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100247 if (nbd >= 0) {
Paolo Bonzinia517e882011-11-04 15:51:21 +0100248 close(nbd);
thscd831bd2008-07-03 10:23:51 +0000249 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100250 return NULL;
251}
252
253static void *nbd_client_thread(void *arg)
254{
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100255 char *device = arg;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100256 off_t size;
Eric Blake7423f412016-07-21 13:34:46 -0600257 uint16_t nbdflags;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000258 QIOChannelSocket *sioc;
259 int fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100260 int ret;
261 pthread_t show_parts_thread;
Max Reitz1ce52842015-01-26 21:02:59 -0500262 Error *local_error = NULL;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100263
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000264 sioc = qio_channel_socket_new();
265 if (qio_channel_socket_connect_sync(sioc,
266 saddr,
267 &local_error) < 0) {
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100268 error_report_err(local_error);
Stefan Hajnoczidc10e8b2012-01-05 13:16:07 +0000269 goto out;
270 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100271
Daniel P. Berrange1c778ef2016-02-10 18:41:04 +0000272 ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, &nbdflags,
Daniel P. Berrangef95910f2016-02-10 18:41:11 +0000273 NULL, NULL, NULL,
Max Reitz3f472652015-02-25 13:08:25 -0500274 &size, &local_error);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100275 if (ret < 0) {
Max Reitz1ce52842015-01-26 21:02:59 -0500276 if (local_error) {
Markus Armbruster78288672015-12-18 16:35:07 +0100277 error_report_err(local_error);
Max Reitz1ce52842015-01-26 21:02:59 -0500278 }
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100279 goto out_socket;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100280 }
281
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100282 fd = open(device, O_RDWR);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100283 if (fd < 0) {
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100284 /* Linux-only, we can use %m in printf. */
Markus Armbrusterb9884682015-12-18 16:35:18 +0100285 error_report("Failed to open %s: %m", device);
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100286 goto out_socket;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100287 }
288
Daniel P. Berrange1c778ef2016-02-10 18:41:04 +0000289 ret = nbd_init(fd, sioc, nbdflags, size);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100290 if (ret < 0) {
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100291 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100292 }
293
294 /* update partition table */
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100295 pthread_create(&show_parts_thread, NULL, show_parts, device);
Paolo Bonzinia517e882011-11-04 15:51:21 +0100296
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100297 if (verbose) {
298 fprintf(stderr, "NBD device %s is now connected to %s\n",
299 device, srcpath);
300 } else {
301 /* Close stderr so that the qemu-nbd process exits. */
302 dup2(STDOUT_FILENO, STDERR_FILENO);
303 }
Paolo Bonzinia517e882011-11-04 15:51:21 +0100304
305 ret = nbd_client(fd);
306 if (ret) {
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100307 goto out_fd;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100308 }
309 close(fd);
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000310 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100311 kill(getpid(), SIGTERM);
312 return (void *) EXIT_SUCCESS;
313
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100314out_fd:
315 close(fd);
316out_socket:
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000317 object_unref(OBJECT(sioc));
Paolo Bonzinia517e882011-11-04 15:51:21 +0100318out:
319 kill(getpid(), SIGTERM);
320 return (void *) EXIT_FAILURE;
thscd831bd2008-07-03 10:23:51 +0000321}
322
Fam Zhenge4afbf42015-05-19 10:50:59 +0000323static int nbd_can_accept(void)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200324{
325 return nb_fds < shared;
326}
327
Paolo Bonzini7860a382012-09-18 13:31:56 +0200328static void nbd_export_closed(NBDExport *exp)
329{
330 assert(state == TERMINATING);
331 state = TERMINATED;
332}
333
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000334static void nbd_update_server_watch(void);
Fam Zhenge4afbf42015-05-19 10:50:59 +0000335
Paolo Bonzini1743b512011-09-19 14:33:23 +0200336static void nbd_client_closed(NBDClient *client)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200337{
Paolo Bonzini1743b512011-09-19 14:33:23 +0200338 nb_fds--;
Paolo Bonzini7860a382012-09-18 13:31:56 +0200339 if (nb_fds == 0 && !persistent && state == RUNNING) {
340 state = TERMINATE;
341 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000342 nbd_update_server_watch();
Paolo Bonzini7860a382012-09-18 13:31:56 +0200343 nbd_client_put(client);
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200344}
345
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000346static gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200347{
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000348 QIOChannelSocket *cioc;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200349
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000350 cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
351 NULL);
352 if (!cioc) {
353 return TRUE;
Paolo Bonzini0c544d72014-03-14 18:10:54 +0100354 }
355
Paolo Bonzini7860a382012-09-18 13:31:56 +0200356 if (state >= TERMINATE) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000357 object_unref(OBJECT(cioc));
358 return TRUE;
Paolo Bonzini7860a382012-09-18 13:31:56 +0200359 }
360
Fam Zhengee7d7aa2016-01-14 16:41:01 +0800361 nb_fds++;
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000362 nbd_update_server_watch();
Daniel P. Berrangef95910f2016-02-10 18:41:11 +0000363 nbd_client_new(newproto ? NULL : exp, cioc,
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000364 tlscreds, NULL, nbd_client_closed);
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000365 object_unref(OBJECT(cioc));
366
367 return TRUE;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200368}
369
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000370static void nbd_update_server_watch(void)
Fam Zhenge4afbf42015-05-19 10:50:59 +0000371{
372 if (nbd_can_accept()) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000373 if (server_watch == -1) {
374 server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
375 G_IO_IN,
376 nbd_accept,
377 NULL, NULL);
378 }
Fam Zhenge4afbf42015-05-19 10:50:59 +0000379 } else {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000380 if (server_watch != -1) {
381 g_source_remove(server_watch);
382 server_watch = -1;
383 }
Fam Zhenge4afbf42015-05-19 10:50:59 +0000384 }
385}
386
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100387
388static SocketAddress *nbd_build_socket_address(const char *sockpath,
389 const char *bindto,
390 const char *port)
391{
392 SocketAddress *saddr;
393
394 saddr = g_new0(SocketAddress, 1);
395 if (sockpath) {
Eric Blake2d32add2015-10-26 16:34:55 -0600396 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
Eric Blake32bafa82016-03-17 16:48:37 -0600397 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
398 saddr->u.q_unix.data->path = g_strdup(sockpath);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100399 } else {
Eric Blake03992932016-03-03 09:16:48 -0700400 InetSocketAddress *inet;
Eric Blake2d32add2015-10-26 16:34:55 -0600401 saddr->type = SOCKET_ADDRESS_KIND_INET;
Eric Blake32bafa82016-03-17 16:48:37 -0600402 inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
Eric Blake03992932016-03-03 09:16:48 -0700403 inet->host = g_strdup(bindto);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100404 if (port) {
Eric Blake03992932016-03-03 09:16:48 -0700405 inet->port = g_strdup(port);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100406 } else {
Eric Blake03992932016-03-03 09:16:48 -0700407 inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100408 }
409 }
410
411 return saddr;
412}
413
414
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000415static QemuOptsList file_opts = {
416 .name = "file",
417 .implied_opt_name = "file",
418 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
419 .desc = {
420 /* no elements => accept any params */
421 { /* end of list */ }
422 },
423};
424
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000425static QemuOptsList qemu_object_opts = {
426 .name = "object",
427 .implied_opt_name = "qom-type",
428 .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
429 .desc = {
430 { }
431 },
432};
433
434
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000435
436static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
437{
438 Object *obj;
439 QCryptoTLSCreds *creds;
440
441 obj = object_resolve_path_component(
442 object_get_objects_root(), id);
443 if (!obj) {
444 error_setg(errp, "No TLS credentials with id '%s'",
445 id);
446 return NULL;
447 }
448 creds = (QCryptoTLSCreds *)
449 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
450 if (!creds) {
451 error_setg(errp, "Object with id '%s' is not TLS credentials",
452 id);
453 return NULL;
454 }
455
456 if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
457 error_setg(errp,
458 "Expecting TLS credentials with a server endpoint");
459 return NULL;
460 }
461 object_ref(obj);
462 return creds;
463}
464
465
bellard7a5ca862008-05-27 21:13:40 +0000466int main(int argc, char **argv)
467{
Markus Armbruster26f54e92014-10-07 13:59:04 +0200468 BlockBackend *blk;
bellard7a5ca862008-05-27 21:13:40 +0000469 BlockDriverState *bs;
470 off_t dev_offset = 0;
Eric Blake7423f412016-07-21 13:34:46 -0600471 uint16_t nbdflags = 0;
thscd831bd2008-07-03 10:23:51 +0000472 bool disconnect = false;
bellard7a5ca862008-05-27 21:13:40 +0000473 const char *bindto = "0.0.0.0";
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100474 const char *port = NULL;
475 char *sockpath = NULL;
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100476 char *device = NULL;
bellard7a5ca862008-05-27 21:13:40 +0000477 off_t fd_size;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800478 QemuOpts *sn_opts = NULL;
479 const char *sn_id_or_name = NULL;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300480 const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:";
bellard7a5ca862008-05-27 21:13:40 +0000481 struct option lopt[] = {
Daniel P. Berrangeaa6e5462016-02-17 10:10:22 +0000482 { "help", no_argument, NULL, 'h' },
483 { "version", no_argument, NULL, 'V' },
484 { "bind", required_argument, NULL, 'b' },
485 { "port", required_argument, NULL, 'p' },
486 { "socket", required_argument, NULL, 'k' },
487 { "offset", required_argument, NULL, 'o' },
488 { "read-only", no_argument, NULL, 'r' },
489 { "partition", required_argument, NULL, 'P' },
490 { "connect", required_argument, NULL, 'c' },
491 { "disconnect", no_argument, NULL, 'd' },
492 { "snapshot", no_argument, NULL, 's' },
493 { "load-snapshot", required_argument, NULL, 'l' },
494 { "nocache", no_argument, NULL, 'n' },
495 { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE },
496 { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO },
497 { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD },
498 { "detect-zeroes", required_argument, NULL,
499 QEMU_NBD_OPT_DETECT_ZEROES },
500 { "shared", required_argument, NULL, 'e' },
501 { "format", required_argument, NULL, 'f' },
502 { "persistent", no_argument, NULL, 't' },
503 { "verbose", no_argument, NULL, 'v' },
504 { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT },
505 { "export-name", required_argument, NULL, 'x' },
506 { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS },
507 { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS },
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300508 { "trace", required_argument, NULL, 'T' },
Max Reitzffb31e12016-09-28 22:46:42 +0200509 { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK },
Blue Swirl660f11b2009-07-31 21:16:51 +0000510 { NULL, 0, NULL, 0 }
bellard7a5ca862008-05-27 21:13:40 +0000511 };
512 int ch;
513 int opt_ind = 0;
bellard7a5ca862008-05-27 21:13:40 +0000514 char *end;
Naphtali Spreif5edb012010-01-17 16:48:13 +0200515 int flags = BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000516 int partition = -1;
Max Reitz4fbec262015-02-05 13:58:19 -0500517 int ret = 0;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200518 bool seen_cache = false;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100519 bool seen_discard = false;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200520 bool seen_aio = false;
Paolo Bonzinia517e882011-11-04 15:51:21 +0100521 pthread_t client_thread;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000522 const char *fmt = NULL;
Max Reitz34b5d2c2013-09-05 14:45:29 +0200523 Error *local_err = NULL;
Peter Lievenb3838a42014-08-13 19:20:18 +0200524 BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
Max Reitz4fbec262015-02-05 13:58:19 -0500525 QDict *options = NULL;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000526 const char *export_name = NULL;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000527 const char *tlscredsid = NULL;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000528 bool imageOpts = false;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100529 bool writethrough = true;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300530 char *trace_file = NULL;
Max Reitzffb31e12016-09-28 22:46:42 +0200531 bool fork_process = false;
532 int old_stderr = -1;
bellard7a5ca862008-05-27 21:13:40 +0000533
Paolo Bonzinia517e882011-11-04 15:51:21 +0100534 /* The client thread uses SIGTERM to interrupt the server. A signal
535 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
536 */
Paolo Bonzinibb345112011-11-04 15:51:19 +0100537 struct sigaction sa_sigterm;
Paolo Bonzinibb345112011-11-04 15:51:19 +0100538 memset(&sa_sigterm, 0, sizeof(sa_sigterm));
539 sa_sigterm.sa_handler = termsig_handler;
540 sigaction(SIGTERM, &sa_sigterm, NULL);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100541
Daniel P. Berrangefe4db842016-10-04 14:35:52 +0100542 module_call_init(MODULE_INIT_TRACE);
Eduardo Habkoste8f2d272016-05-12 11:10:04 -0300543 qcrypto_init(&error_fatal);
Daniel P. Berrangec2297082016-04-06 12:12:06 +0100544
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000545 module_call_init(MODULE_INIT_QOM);
546 qemu_add_opts(&qemu_object_opts);
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300547 qemu_add_opts(&qemu_trace_opts);
Fam Zheng10f5bff2014-02-10 14:48:51 +0800548 qemu_init_exec_dir(argv[0]);
Paolo Bonzinibb345112011-11-04 15:51:19 +0100549
bellard7a5ca862008-05-27 21:13:40 +0000550 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
551 switch (ch) {
552 case 's':
ths2f726482008-07-03 11:47:46 +0000553 flags |= BDRV_O_SNAPSHOT;
554 break;
555 case 'n':
Paolo Bonzini39a52352012-07-18 14:57:15 +0200556 optarg = (char *) "none";
557 /* fallthrough */
558 case QEMU_NBD_OPT_CACHE:
559 if (seen_cache) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100560 error_report("-n and --cache can only be specified once");
561 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200562 }
563 seen_cache = true;
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100564 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100565 error_report("Invalid cache mode `%s'", optarg);
566 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200567 }
bellard7a5ca862008-05-27 21:13:40 +0000568 break;
Paolo Bonzini39a52352012-07-18 14:57:15 +0200569 case QEMU_NBD_OPT_AIO:
570 if (seen_aio) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100571 error_report("--aio can only be specified once");
572 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200573 }
574 seen_aio = true;
575 if (!strcmp(optarg, "native")) {
576 flags |= BDRV_O_NATIVE_AIO;
577 } else if (!strcmp(optarg, "threads")) {
578 /* this is the default */
579 } else {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100580 error_report("invalid aio mode `%s'", optarg);
581 exit(EXIT_FAILURE);
Paolo Bonzini39a52352012-07-18 14:57:15 +0200582 }
583 break;
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100584 case QEMU_NBD_OPT_DISCARD:
585 if (seen_discard) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100586 error_report("--discard can only be specified once");
587 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100588 }
589 seen_discard = true;
590 if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100591 error_report("Invalid discard mode `%s'", optarg);
592 exit(EXIT_FAILURE);
Paolo Bonzinided9d2d2013-02-08 14:06:13 +0100593 }
594 break;
Peter Lievenb3838a42014-08-13 19:20:18 +0200595 case QEMU_NBD_OPT_DETECT_ZEROES:
596 detect_zeroes =
597 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
598 optarg,
Eric Blake7fb1cf12015-11-18 01:52:57 -0700599 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
Peter Lievenb3838a42014-08-13 19:20:18 +0200600 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
601 &local_err);
602 if (local_err) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100603 error_reportf_err(local_err,
604 "Failed to parse detect_zeroes mode: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100605 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200606 }
607 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
608 !(flags & BDRV_O_UNMAP)) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100609 error_report("setting detect-zeroes to unmap is not allowed "
610 "without setting discard operation to unmap");
611 exit(EXIT_FAILURE);
Peter Lievenb3838a42014-08-13 19:20:18 +0200612 }
613 break;
bellard7a5ca862008-05-27 21:13:40 +0000614 case 'b':
615 bindto = optarg;
616 break;
617 case 'p':
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100618 port = optarg;
bellard7a5ca862008-05-27 21:13:40 +0000619 break;
620 case 'o':
621 dev_offset = strtoll (optarg, &end, 0);
622 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100623 error_report("Invalid offset `%s'", optarg);
624 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000625 }
626 if (dev_offset < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100627 error_report("Offset must be positive `%s'", optarg);
628 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000629 }
630 break;
Wenchao Xia8c116b02013-12-04 17:10:55 +0800631 case 'l':
632 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
Markus Armbruster70b94332015-02-13 12:50:26 +0100633 sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
634 optarg, false);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800635 if (!sn_opts) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100636 error_report("Failed in parsing snapshot param `%s'",
637 optarg);
638 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800639 }
640 } else {
641 sn_id_or_name = optarg;
642 }
643 /* fall through */
bellard7a5ca862008-05-27 21:13:40 +0000644 case 'r':
Paolo Bonzinib90fb4b2011-09-08 17:24:54 +0200645 nbdflags |= NBD_FLAG_READ_ONLY;
Naphtali Sprei07108b22010-03-14 15:19:57 +0200646 flags &= ~BDRV_O_RDWR;
bellard7a5ca862008-05-27 21:13:40 +0000647 break;
648 case 'P':
649 partition = strtol(optarg, &end, 0);
Peter Lieven713cc672014-08-13 19:20:19 +0200650 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100651 error_report("Invalid partition `%s'", optarg);
652 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200653 }
654 if (partition < 1 || partition > 8) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100655 error_report("Invalid partition %d", partition);
656 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200657 }
bellard7a5ca862008-05-27 21:13:40 +0000658 break;
thscd831bd2008-07-03 10:23:51 +0000659 case 'k':
Paolo Bonzinib32f6c22011-11-04 15:51:20 +0100660 sockpath = optarg;
Peter Lieven713cc672014-08-13 19:20:19 +0200661 if (sockpath[0] != '/') {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100662 error_report("socket path must be absolute");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100663 exit(EXIT_FAILURE);
Peter Lieven713cc672014-08-13 19:20:19 +0200664 }
thscd831bd2008-07-03 10:23:51 +0000665 break;
666 case 'd':
667 disconnect = true;
668 break;
669 case 'c':
670 device = optarg;
671 break;
ths3b05a8e2008-07-03 12:45:02 +0000672 case 'e':
673 shared = strtol(optarg, &end, 0);
674 if (*end) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100675 error_report("Invalid shared device number '%s'", optarg);
676 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000677 }
678 if (shared < 1) {
Markus Armbruster9af9e0f2015-12-18 16:35:19 +0100679 error_report("Shared device number must be greater than 0");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100680 exit(EXIT_FAILURE);
ths3b05a8e2008-07-03 12:45:02 +0000681 }
682 break;
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000683 case 'f':
684 fmt = optarg;
685 break;
Peter Lieven713cc672014-08-13 19:20:19 +0200686 case 't':
687 persistent = 1;
688 break;
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000689 case 'x':
690 export_name = optarg;
691 break;
bellard7a5ca862008-05-27 21:13:40 +0000692 case 'v':
693 verbose = 1;
694 break;
695 case 'V':
696 version(argv[0]);
697 exit(0);
698 break;
699 case 'h':
700 usage(argv[0]);
701 exit(0);
702 break;
703 case '?':
Markus Armbruster85b01e02015-12-18 16:35:04 +0100704 error_report("Try `%s --help' for more information.", argv[0]);
705 exit(EXIT_FAILURE);
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000706 case QEMU_NBD_OPT_OBJECT: {
707 QemuOpts *opts;
708 opts = qemu_opts_parse_noisily(&qemu_object_opts,
709 optarg, true);
710 if (!opts) {
711 exit(EXIT_FAILURE);
712 }
713 } break;
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000714 case QEMU_NBD_OPT_TLSCREDS:
715 tlscredsid = optarg;
716 break;
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000717 case QEMU_NBD_OPT_IMAGE_OPTS:
718 imageOpts = true;
719 break;
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300720 case 'T':
721 g_free(trace_file);
722 trace_file = trace_opt_parse(optarg);
723 break;
Max Reitzffb31e12016-09-28 22:46:42 +0200724 case QEMU_NBD_OPT_FORK:
725 fork_process = true;
726 break;
bellard7a5ca862008-05-27 21:13:40 +0000727 }
728 }
729
730 if ((argc - optind) != 1) {
Markus Armbruster433672b2015-12-18 16:35:24 +0100731 error_report("Invalid number of arguments");
732 error_printf("Try `%s --help' for more information.\n", argv[0]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100733 exit(EXIT_FAILURE);
bellard7a5ca862008-05-27 21:13:40 +0000734 }
735
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000736 if (qemu_opts_foreach(&qemu_object_opts,
737 user_creatable_add_opts_foreach,
Markus Armbruster51b9b472016-04-27 16:29:09 +0200738 NULL, NULL)) {
Daniel P. Berrange0ab3b332016-02-10 18:41:00 +0000739 exit(EXIT_FAILURE);
740 }
741
Denis V. Lunev39ca4632016-06-17 17:44:12 +0300742 if (!trace_init_backends()) {
743 exit(1);
744 }
745 trace_init_file(trace_file);
746 qemu_set_log(LOG_TRACE);
747
Daniel P. Berrange145614a2016-02-10 18:41:13 +0000748 if (tlscredsid) {
749 if (sockpath) {
750 error_report("TLS is only supported with IPv4/IPv6");
751 exit(EXIT_FAILURE);
752 }
753 if (device) {
754 error_report("TLS is not supported with a host device");
755 exit(EXIT_FAILURE);
756 }
757 if (!export_name) {
758 /* Set the default NBD protocol export name, since
759 * we *must* use new style protocol for TLS */
760 export_name = "";
761 }
762 tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
763 if (local_err) {
764 error_report("Failed to get TLS creds %s",
765 error_get_pretty(local_err));
766 exit(EXIT_FAILURE);
767 }
768 }
769
thscd831bd2008-07-03 10:23:51 +0000770 if (disconnect) {
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000771 int nbdfd = open(argv[optind], O_RDWR);
772 if (nbdfd < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100773 error_report("Cannot open %s: %s", argv[optind],
774 strerror(errno));
775 exit(EXIT_FAILURE);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100776 }
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000777 nbd_disconnect(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000778
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000779 close(nbdfd);
thscd831bd2008-07-03 10:23:51 +0000780
781 printf("%s disconnected\n", argv[optind]);
782
Peter Lieven713cc672014-08-13 19:20:19 +0200783 return 0;
thscd831bd2008-07-03 10:23:51 +0000784 }
785
Max Reitzffb31e12016-09-28 22:46:42 +0200786 if ((device && !verbose) || fork_process) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100787 int stderr_fd[2];
788 pid_t pid;
789 int ret;
790
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100791 if (qemu_pipe(stderr_fd) < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100792 error_report("Error setting up communication pipe: %s",
793 strerror(errno));
794 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100795 }
796
797 /* Now daemonize, but keep a communication channel open to
798 * print errors and exit with the proper status code.
799 */
800 pid = fork();
Max Reitz70d47392015-02-25 13:08:22 -0500801 if (pid < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100802 error_report("Failed to fork: %s", strerror(errno));
803 exit(EXIT_FAILURE);
Max Reitz70d47392015-02-25 13:08:22 -0500804 } else if (pid == 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100805 close(stderr_fd[0]);
Michael Tokarev9faf31b2012-01-16 18:37:44 +0400806 ret = qemu_daemon(1, 0);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100807
808 /* Temporarily redirect stderr to the parent's pipe... */
Max Reitzffb31e12016-09-28 22:46:42 +0200809 old_stderr = dup(STDERR_FILENO);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100810 dup2(stderr_fd[1], STDERR_FILENO);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100811 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100812 error_report("Failed to daemonize: %s", strerror(errno));
813 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100814 }
815
816 /* ... close the descriptor we inherited and go on. */
817 close(stderr_fd[1]);
818 } else {
819 bool errors = false;
820 char *buf;
821
822 /* In the parent. Print error messages from the child until
823 * it closes the pipe.
824 */
825 close(stderr_fd[1]);
826 buf = g_malloc(1024);
827 while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
828 errors = true;
829 ret = qemu_write_full(STDERR_FILENO, buf, ret);
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100830 if (ret < 0) {
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100831 exit(EXIT_FAILURE);
832 }
833 }
Paolo Bonzinifc19f8a2012-03-07 11:05:34 +0100834 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100835 error_report("Cannot read from daemon: %s",
836 strerror(errno));
837 exit(EXIT_FAILURE);
Paolo Bonzinic1f8fdc2011-11-04 15:51:22 +0100838 }
839
840 /* Usually the daemon should not print any message.
841 * Exit with zero status in that case.
842 */
843 exit(errors);
844 }
845 }
846
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100847 if (device != NULL && sockpath == NULL) {
848 sockpath = g_malloc(128);
849 snprintf(sockpath, 128, SOCKET_PATH, basename(device));
thscd831bd2008-07-03 10:23:51 +0000850 }
851
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100852 saddr = nbd_build_socket_address(sockpath, bindto, port);
853
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300854 if (qemu_init_main_loop(&local_err)) {
Markus Armbruster565f65d2015-02-12 13:55:05 +0100855 error_report_err(local_err);
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300856 exit(EXIT_FAILURE);
857 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100858 bdrv_init();
859 atexit(bdrv_close_all);
860
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000861 srcpath = argv[optind];
862 if (imageOpts) {
863 QemuOpts *opts;
864 if (fmt) {
865 error_report("--image-opts and -f are mutually exclusive");
866 exit(EXIT_FAILURE);
867 }
868 opts = qemu_opts_parse_noisily(&file_opts, srcpath, true);
869 if (!opts) {
870 qemu_opts_reset(&file_opts);
871 exit(EXIT_FAILURE);
872 }
873 options = qemu_opts_to_qdict(opts, NULL);
874 qemu_opts_reset(&file_opts);
Max Reitzefaa7c42016-03-16 19:54:38 +0100875 blk = blk_new_open(NULL, NULL, options, flags, &local_err);
Daniel P. Berrange77c9aae2016-02-17 10:10:19 +0000876 } else {
877 if (fmt) {
878 options = qdict_new();
879 qdict_put(options, "driver", qstring_from_str(fmt));
880 }
Max Reitzefaa7c42016-03-16 19:54:38 +0100881 blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
Daniel P. Berrangee6b63672013-03-19 11:20:20 +0000882 }
883
Max Reitz4fbec262015-02-05 13:58:19 -0500884 if (!blk) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100885 error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
886 argv[optind]);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100887 exit(EXIT_FAILURE);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100888 }
Max Reitz4fbec262015-02-05 13:58:19 -0500889 bs = blk_bs(blk);
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100890
Kevin Wolf6effd5b2016-03-14 11:43:28 +0100891 blk_set_enable_write_cache(blk, !writethrough);
892
Wenchao Xia8c116b02013-12-04 17:10:55 +0800893 if (sn_opts) {
894 ret = bdrv_snapshot_load_tmp(bs,
895 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
896 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
897 &local_err);
898 } else if (sn_id_or_name) {
899 ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
900 &local_err);
901 }
902 if (ret < 0) {
Markus Armbrusterc29b77f2015-12-18 16:35:14 +0100903 error_reportf_err(local_err, "Failed to load snapshot: ");
Markus Armbruster85b01e02015-12-18 16:35:04 +0100904 exit(EXIT_FAILURE);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800905 }
906
Peter Lievenb3838a42014-08-13 19:20:18 +0200907 bs->detect_zeroes = detect_zeroes;
Max Reitz4c58e802014-11-18 12:21:19 +0100908 fd_size = blk_getlength(blk);
Max Reitz98f44bb2015-02-25 13:08:21 -0500909 if (fd_size < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100910 error_report("Failed to determine the image length: %s",
911 strerror(-fd_size));
912 exit(EXIT_FAILURE);
Max Reitz98f44bb2015-02-25 13:08:21 -0500913 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100914
Tomáš Golembiovskýe424b652016-10-05 23:40:20 +0200915 if (dev_offset >= fd_size) {
916 error_report("Offset (%lld) has to be smaller than the image size "
917 "(%lld)",
918 (long long int)dev_offset, (long long int)fd_size);
919 exit(EXIT_FAILURE);
920 }
921 fd_size -= dev_offset;
922
Paolo Bonzini185b4332012-03-05 08:56:10 +0100923 if (partition != -1) {
Max Reitz4c58e802014-11-18 12:21:19 +0100924 ret = find_partition(blk, partition, &dev_offset, &fd_size);
Paolo Bonzini185b4332012-03-05 08:56:10 +0100925 if (ret < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100926 error_report("Could not find partition %d: %s", partition,
Markus Armbrustera4699e52015-12-18 16:35:10 +0100927 strerror(-ret));
Markus Armbruster85b01e02015-12-18 16:35:04 +0100928 exit(EXIT_FAILURE);
Paolo Bonzini185b4332012-03-05 08:56:10 +0100929 }
Paolo Bonzini802ddc32011-11-04 15:51:24 +0100930 }
931
Kevin Wolfcd7fca92016-07-06 11:22:39 +0200932 exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
933 writethrough, NULL, &local_err);
Max Reitz98f44bb2015-02-25 13:08:21 -0500934 if (!exp) {
Markus Armbruster4fffeb52015-12-18 16:35:05 +0100935 error_report_err(local_err);
Markus Armbruster85b01e02015-12-18 16:35:04 +0100936 exit(EXIT_FAILURE);
Max Reitz98f44bb2015-02-25 13:08:21 -0500937 }
Daniel P. Berrange3d4b2f92016-02-10 18:41:08 +0000938 if (export_name) {
939 nbd_export_set_name(exp, export_name);
940 newproto = true;
941 }
ths3b05a8e2008-07-03 12:45:02 +0000942
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000943 server_ioc = qio_channel_socket_new();
944 if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
945 object_unref(OBJECT(server_ioc));
Daniel P. Berrange48bec072015-09-16 14:52:23 +0100946 error_report_err(local_err);
bellard7a5ca862008-05-27 21:13:40 +0000947 return 1;
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200948 }
Paolo Bonzinif1ef5552011-11-04 15:51:23 +0100949
950 if (device) {
951 int ret;
952
Paolo Bonzinia6ac2312011-12-06 09:07:00 +0100953 ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +0100954 if (ret != 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100955 error_report("Failed to create client thread: %s", strerror(ret));
956 exit(EXIT_FAILURE);
Paolo Bonzinif1ef5552011-11-04 15:51:23 +0100957 }
958 } else {
959 /* Shut up GCC warnings. */
960 memset(&client_thread, 0, sizeof(client_thread));
961 }
962
Daniel P. Berranged0d6ff52016-02-10 18:41:02 +0000963 nbd_update_server_watch();
bellard7a5ca862008-05-27 21:13:40 +0000964
Michael Tokarev9faf31b2012-01-16 18:37:44 +0400965 /* now when the initialization is (almost) complete, chdir("/")
966 * to free any busy filesystems */
967 if (chdir("/") < 0) {
Markus Armbruster85b01e02015-12-18 16:35:04 +0100968 error_report("Could not chdir to root directory: %s",
969 strerror(errno));
970 exit(EXIT_FAILURE);
Michael Tokarev9faf31b2012-01-16 18:37:44 +0400971 }
972
Max Reitzffb31e12016-09-28 22:46:42 +0200973 if (fork_process) {
974 dup2(old_stderr, STDERR_FILENO);
975 close(old_stderr);
976 }
977
Paolo Bonzini7860a382012-09-18 13:31:56 +0200978 state = RUNNING;
ths3b05a8e2008-07-03 12:45:02 +0000979 do {
Paolo Bonzinia61c6782011-09-12 17:28:11 +0200980 main_loop_wait(false);
Paolo Bonzini7860a382012-09-18 13:31:56 +0200981 if (state == TERMINATE) {
982 state = TERMINATING;
983 nbd_export_close(exp);
984 nbd_export_put(exp);
985 exp = NULL;
986 }
987 } while (state != TERMINATED);
ths3b05a8e2008-07-03 12:45:02 +0000988
Markus Armbruster26f54e92014-10-07 13:59:04 +0200989 blk_unref(blk);
Paolo Bonzinib32f6c22011-11-04 15:51:20 +0100990 if (sockpath) {
991 unlink(sockpath);
992 }
bellard7a5ca862008-05-27 21:13:40 +0000993
Markus Armbrusterfbf28a42014-09-29 16:07:55 +0200994 qemu_opts_del(sn_opts);
Wenchao Xia8c116b02013-12-04 17:10:55 +0800995
Paolo Bonzinia517e882011-11-04 15:51:21 +0100996 if (device) {
997 void *ret;
998 pthread_join(client_thread, &ret);
999 exit(ret != NULL);
1000 } else {
1001 exit(EXIT_SUCCESS);
1002 }
bellard7a5ca862008-05-27 21:13:40 +00001003}