2 * Privileged helper to handle persistent reservation commands for QEMU
4 * Copyright (C) 2017 Red Hat, Inc. <pbonzini@redhat.com>
6 * Author: Paolo Bonzini <pbonzini@redhat.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; under version 2 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
23 #include <sys/ioctl.h>
24 #include <linux/dm-ioctl.h>
35 #include <mpath_cmd.h>
36 #include <mpath_persist.h>
39 #include "qapi/error.h"
40 #include "qemu-common.h"
41 #include "qemu/cutils.h"
42 #include "qemu/main-loop.h"
43 #include "qemu/error-report.h"
44 #include "qemu/config-file.h"
45 #include "qemu/bswap.h"
47 #include "qemu/systemd.h"
48 #include "qapi/util.h"
49 #include "qapi/qmp/qstring.h"
50 #include "io/channel-socket.h"
51 #include "trace/control.h"
52 #include "qemu-version.h"
54 #include "block/aio.h"
55 #include "block/thread-pool.h"
57 #include "scsi/constants.h"
58 #include "scsi/utils.h"
59 #include "pr-helper.h"
61 #define PR_OUT_FIXED_PARAM_SIZE 24
63 static char *socket_path
;
65 static enum { RUNNING
, TERMINATE
, TERMINATING
} state
;
66 static QIOChannelSocket
*server_ioc
;
67 static int server_watch
;
68 static int num_active_sockets
= 1;
77 static void compute_default_paths(void)
80 socket_path
= qemu_get_local_state_pathname("run/qemu-pr-helper.sock");
84 static void usage(const char *name
)
86 compute_default_paths();
88 "Usage: %s [OPTIONS] FILE\n"
89 "Persistent Reservation helper program for QEMU\n"
91 " -h, --help display this help and exit\n"
92 " -V, --version output version information and exit\n"
94 " -d, --daemon run in the background\n"
95 " -f, --pidfile=PATH PID file when running as a daemon\n"
97 " -k, --socket=PATH path to the unix socket\n"
99 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
100 " specify tracing options\n"
102 " -u, --user=USER user to drop privileges to\n"
103 " -g, --group=GROUP group to drop privileges to\n"
106 QEMU_HELP_BOTTOM
"\n"
107 , name
, pidfile
, socket_path
);
110 static void version(const char *name
)
113 "%s " QEMU_FULL_VERSION
"\n"
114 "Written by Paolo Bonzini.\n"
117 "This is free software; see the source for copying conditions. There is NO\n"
118 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
122 static void write_pidfile(void)
127 pidfd
= qemu_open(pidfile
, O_CREAT
|O_WRONLY
, S_IRUSR
|S_IWUSR
);
129 error_report("Cannot open pid file, %s", strerror(errno
));
133 if (lockf(pidfd
, F_TLOCK
, 0)) {
134 error_report("Cannot lock pid file, %s", strerror(errno
));
137 if (ftruncate(pidfd
, 0)) {
138 error_report("Failed to truncate pid file");
142 snprintf(pidstr
, sizeof(pidstr
), "%d\n", getpid());
143 if (write(pidfd
, pidstr
, strlen(pidstr
)) != strlen(pidstr
)) {
144 error_report("Failed to write pid file");
157 typedef struct PRHelperSGIOData
{
162 int sz
; /* input/output */
166 static int do_sgio_worker(void *opaque
)
168 PRHelperSGIOData
*data
= opaque
;
169 struct sg_io_hdr io_hdr
;
172 SCSISense sense_code
;
174 memset(data
->sense
, 0, PR_HELPER_SENSE_SIZE
);
175 memset(&io_hdr
, 0, sizeof(io_hdr
));
176 io_hdr
.interface_id
= 'S';
177 io_hdr
.cmd_len
= PR_HELPER_CDB_SIZE
;
178 io_hdr
.cmdp
= (uint8_t *)data
->cdb
;
179 io_hdr
.sbp
= data
->sense
;
180 io_hdr
.mx_sb_len
= PR_HELPER_SENSE_SIZE
;
182 io_hdr
.dxfer_direction
= data
->dir
;
183 io_hdr
.dxferp
= (char *)data
->buf
;
184 io_hdr
.dxfer_len
= data
->sz
;
185 ret
= ioctl(data
->fd
, SG_IO
, &io_hdr
);
186 status
= sg_io_sense_from_errno(ret
< 0 ? errno
: 0, &io_hdr
,
188 if (status
== GOOD
) {
189 data
->sz
-= io_hdr
.resid
;
194 if (status
== CHECK_CONDITION
&&
195 !(io_hdr
.driver_status
& SG_ERR_DRIVER_SENSE
)) {
196 scsi_build_sense(data
->sense
, sense_code
);
202 static int do_sgio(int fd
, const uint8_t *cdb
, uint8_t *sense
,
203 uint8_t *buf
, int *sz
, int dir
)
205 ThreadPool
*pool
= aio_get_thread_pool(qemu_get_aio_context());
208 PRHelperSGIOData data
= {
217 r
= thread_pool_submit_co(pool
, do_sgio_worker
, &data
);
222 /* Device mapper interface */
225 #define CONTROL_PATH "/dev/mapper/control"
227 typedef struct DMData
{
232 static int control_fd
;
234 static void *dm_ioctl(int ioc
, struct dm_ioctl
*dm
)
237 memcpy(&d
.dm
, dm
, sizeof(d
.dm
));
238 QEMU_BUILD_BUG_ON(sizeof(d
.data
) < sizeof(struct dm_target_spec
));
240 d
.dm
.version
[0] = DM_VERSION_MAJOR
;
243 d
.dm
.data_size
= 1024;
244 d
.dm
.data_start
= offsetof(DMData
, data
);
245 if (ioctl(control_fd
, ioc
, &d
) < 0) {
248 memcpy(dm
, &d
.dm
, sizeof(d
.dm
));
252 static void *dm_dev_ioctl(int fd
, int ioc
, struct dm_ioctl
*dm
)
263 dm
->dev
= st
.st_rdev
;
264 return dm_ioctl(ioc
, dm
);
267 static void dm_init(void)
269 control_fd
= open(CONTROL_PATH
, O_RDWR
);
270 if (control_fd
< 0) {
271 perror("Cannot open " CONTROL_PATH
);
274 struct dm_ioctl dm
= { 0 };
275 if (!dm_ioctl(DM_VERSION
, &dm
)) {
279 if (dm
.version
[0] != DM_VERSION_MAJOR
) {
280 fprintf(stderr
, "Unsupported device mapper interface");
285 /* Variables required by libmultipath and libmpathpersist. */
286 QEMU_BUILD_BUG_ON(PR_HELPER_DATA_SIZE
> MPATH_MAX_PARAM_LEN
);
287 static struct config
*multipath_conf
;
288 unsigned mpath_mx_alloc_len
= PR_HELPER_DATA_SIZE
;
292 extern struct config
*get_multipath_config(void);
293 struct config
*get_multipath_config(void)
295 return multipath_conf
;
298 extern void put_multipath_config(struct config
*conf
);
299 void put_multipath_config(struct config
*conf
)
303 static void multipath_pr_init(void)
306 multipath_conf
= mpath_lib_init();
309 static int is_mpath(int fd
)
311 struct dm_ioctl dm
= { .flags
= DM_NOFLUSH_FLAG
};
312 struct dm_target_spec
*tgt
;
314 tgt
= dm_dev_ioctl(fd
, DM_TABLE_STATUS
, &dm
);
316 if (errno
== ENXIO
) {
322 return !strncmp(tgt
->target_type
, "multipath", DM_MAX_TYPE_NAME
);
325 static SCSISense
mpath_generic_sense(int r
)
328 case MPATH_PR_SENSE_NOT_READY
:
329 return SENSE_CODE(NOT_READY
);
330 case MPATH_PR_SENSE_MEDIUM_ERROR
:
331 return SENSE_CODE(READ_ERROR
);
332 case MPATH_PR_SENSE_HARDWARE_ERROR
:
333 return SENSE_CODE(TARGET_FAILURE
);
334 case MPATH_PR_SENSE_ABORTED_COMMAND
:
335 return SENSE_CODE(IO_ERROR
);
341 static int mpath_reconstruct_sense(int fd
, int r
, uint8_t *sense
)
344 case MPATH_PR_SUCCESS
:
346 case MPATH_PR_SENSE_NOT_READY
:
347 case MPATH_PR_SENSE_MEDIUM_ERROR
:
348 case MPATH_PR_SENSE_HARDWARE_ERROR
:
349 case MPATH_PR_SENSE_ABORTED_COMMAND
:
351 /* libmpathpersist ate the exact sense. Try to find it by
352 * issuing TEST UNIT READY.
354 uint8_t cdb
[6] = { TEST_UNIT_READY
};
356 int r
= do_sgio(fd
, cdb
, sense
, NULL
, &sz
, SG_DXFER_NONE
);
361 scsi_build_sense(sense
, mpath_generic_sense(r
));
362 return CHECK_CONDITION
;
365 case MPATH_PR_SENSE_UNIT_ATTENTION
:
366 /* Congratulations libmpathpersist, you ruined the Unit Attention...
367 * Return a heavyweight one.
369 scsi_build_sense(sense
, SENSE_CODE(SCSI_BUS_RESET
));
370 return CHECK_CONDITION
;
371 case MPATH_PR_SENSE_INVALID_OP
:
372 /* Only one valid sense. */
373 scsi_build_sense(sense
, SENSE_CODE(INVALID_OPCODE
));
374 return CHECK_CONDITION
;
375 case MPATH_PR_ILLEGAL_REQ
:
377 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
378 return CHECK_CONDITION
;
379 case MPATH_PR_NO_SENSE
:
380 scsi_build_sense(sense
, SENSE_CODE(NO_SENSE
));
381 return CHECK_CONDITION
;
383 case MPATH_PR_RESERV_CONFLICT
:
384 return RESERVATION_CONFLICT
;
388 scsi_build_sense(sense
, SENSE_CODE(LUN_COMM_FAILURE
));
389 return CHECK_CONDITION
;
393 static int multipath_pr_in(int fd
, const uint8_t *cdb
, uint8_t *sense
,
394 uint8_t *data
, int sz
)
396 int rq_servact
= cdb
[1];
397 struct prin_resp resp
;
401 switch (rq_servact
) {
402 case MPATH_PRIN_RKEY_SA
:
403 case MPATH_PRIN_RRES_SA
:
404 case MPATH_PRIN_RCAP_SA
:
406 case MPATH_PRIN_RFSTAT_SA
:
407 /* Nobody implements it anyway, so bail out. */
409 /* Cannot parse any other output. */
410 scsi_build_sense(sense
, SENSE_CODE(INVALID_FIELD
));
411 return CHECK_CONDITION
;
414 r
= mpath_persistent_reserve_in(fd
, rq_servact
, &resp
, noisy
, verbose
);
415 if (r
== MPATH_PR_SUCCESS
) {
416 switch (rq_servact
) {
417 case MPATH_PRIN_RKEY_SA
:
418 case MPATH_PRIN_RRES_SA
: {
419 struct prin_readdescr
*out
= &resp
.prin_descriptor
.prin_readkeys
;
421 written
= MIN(out
->additional_length
+ 8, sz
);
422 stl_be_p(&data
[0], out
->prgeneration
);
423 stl_be_p(&data
[4], out
->additional_length
);
424 memcpy(&data
[8], out
->key_list
, written
- 8);
427 case MPATH_PRIN_RCAP_SA
: {
428 struct prin_capdescr
*out
= &resp
.prin_descriptor
.prin_readcap
;
431 stw_be_p(&data
[0], out
->length
);
432 data
[2] = out
->flags
[0];
433 data
[3] = out
->flags
[1];
434 stw_be_p(&data
[4], out
->pr_type_mask
);
438 scsi_build_sense(sense
, SENSE_CODE(INVALID_OPCODE
));
439 return CHECK_CONDITION
;
441 assert(written
<= sz
);
442 memset(data
+ written
, 0, sz
- written
);
445 return mpath_reconstruct_sense(fd
, r
, sense
);
448 static int multipath_pr_out(int fd
, const uint8_t *cdb
, uint8_t *sense
,
449 const uint8_t *param
, int sz
)
451 int rq_servact
= cdb
[1];
452 int rq_scope
= cdb
[2] >> 4;
453 int rq_type
= cdb
[2] & 0xf;
454 struct prout_param_descriptor paramp
;
455 char transportids
[PR_HELPER_DATA_SIZE
];
458 if (sz
< PR_OUT_FIXED_PARAM_SIZE
) {
459 /* Illegal request, Parameter list length error. This isn't fatal;
460 * we have read the data, send an error without closing the socket.
462 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM_LEN
));
463 return CHECK_CONDITION
;
466 switch (rq_servact
) {
467 case MPATH_PROUT_REG_SA
:
468 case MPATH_PROUT_RES_SA
:
469 case MPATH_PROUT_REL_SA
:
470 case MPATH_PROUT_CLEAR_SA
:
471 case MPATH_PROUT_PREE_SA
:
472 case MPATH_PROUT_PREE_AB_SA
:
473 case MPATH_PROUT_REG_IGN_SA
:
475 case MPATH_PROUT_REG_MOV_SA
:
476 /* Not supported by struct prout_param_descriptor. */
478 /* Cannot parse any other input. */
479 scsi_build_sense(sense
, SENSE_CODE(INVALID_FIELD
));
480 return CHECK_CONDITION
;
483 /* Convert input data, especially transport IDs, to the structs
484 * used by libmpathpersist (which, of course, will immediately
487 memset(¶mp
, 0, sizeof(paramp
));
488 memcpy(¶mp
.key
, ¶m
[0], 8);
489 memcpy(¶mp
.sa_key
, ¶m
[8], 8);
490 paramp
.sa_flags
= param
[20];
491 if (sz
> PR_OUT_FIXED_PARAM_SIZE
) {
492 size_t transportid_len
;
494 if (sz
< PR_OUT_FIXED_PARAM_SIZE
+ 4) {
495 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM_LEN
));
496 return CHECK_CONDITION
;
498 transportid_len
= ldl_be_p(¶m
[24]) + PR_OUT_FIXED_PARAM_SIZE
+ 4;
499 if (transportid_len
> sz
) {
500 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
501 return CHECK_CONDITION
;
503 for (i
= PR_OUT_FIXED_PARAM_SIZE
+ 4, j
= 0; i
< transportid_len
; ) {
504 struct transportid
*id
= (struct transportid
*) &transportids
[j
];
507 id
->format_code
= param
[i
] & 0xc0;
508 id
->protocol_id
= param
[i
] & 0x0f;
509 switch (param
[i
] & 0xcf) {
512 if (i
+ 24 > transportid_len
) {
515 memcpy(id
->n_port_name
, ¶m
[i
+ 8], 8);
516 j
+= offsetof(struct transportid
, n_port_name
[8]);
521 /* iSCSI transport. */
522 len
= lduw_be_p(¶m
[i
+ 2]);
523 if (len
> 252 || (len
& 3) || i
+ len
+ 4 > transportid_len
) {
524 /* For format code 00, the standard says the maximum is 223
525 * plus the NUL terminator. For format code 01 there is no
526 * maximum length, but libmpathpersist ignores the first
527 * byte of id->iscsi_name so our maximum is 252.
531 if (memchr(¶m
[i
+ 4], 0, len
) == NULL
) {
534 memcpy(id
->iscsi_name
, ¶m
[i
+ 2], len
+ 2);
535 j
+= offsetof(struct transportid
, iscsi_name
[len
+ 2]);
540 if (i
+ 24 > transportid_len
) {
543 memcpy(id
->sas_address
, ¶m
[i
+ 4], 8);
544 j
+= offsetof(struct transportid
, sas_address
[8]);
549 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
550 return CHECK_CONDITION
;
553 paramp
.trnptid_list
[paramp
.num_transportid
++] = id
;
557 r
= mpath_persistent_reserve_out(fd
, rq_servact
, rq_scope
, rq_type
,
558 ¶mp
, noisy
, verbose
);
559 return mpath_reconstruct_sense(fd
, r
, sense
);
563 static int do_pr_in(int fd
, const uint8_t *cdb
, uint8_t *sense
,
564 uint8_t *data
, int *resp_sz
)
568 /* multipath_pr_in fills the whole input buffer. */
569 int r
= multipath_pr_in(fd
, cdb
, sense
, data
, *resp_sz
);
577 return do_sgio(fd
, cdb
, sense
, data
, resp_sz
,
581 static int do_pr_out(int fd
, const uint8_t *cdb
, uint8_t *sense
,
582 const uint8_t *param
, int sz
)
586 if ((fcntl(fd
, F_GETFL
) & O_ACCMODE
) == O_RDONLY
) {
587 scsi_build_sense(sense
, SENSE_CODE(INVALID_OPCODE
));
588 return CHECK_CONDITION
;
593 return multipath_pr_out(fd
, cdb
, sense
, param
, sz
);
598 return do_sgio(fd
, cdb
, sense
, (uint8_t *)param
, &resp_sz
,
604 typedef struct PRHelperClient
{
605 QIOChannelSocket
*ioc
;
608 uint8_t data
[PR_HELPER_DATA_SIZE
];
611 typedef struct PRHelperRequest
{
614 uint8_t cdb
[PR_HELPER_CDB_SIZE
];
617 static int coroutine_fn
prh_read(PRHelperClient
*client
, void *buf
, int sz
,
631 n_read
= qio_channel_readv_full(QIO_CHANNEL(client
->ioc
), &iov
, 1,
634 if (n_read
== QIO_CHANNEL_ERR_BLOCK
) {
635 qio_channel_yield(QIO_CHANNEL(client
->ioc
), G_IO_IN
);
639 ret
= n_read
? n_read
: -1;
643 /* Stash one file descriptor per request. */
645 bool too_many
= false;
646 for (i
= 0; i
< nfds
; i
++) {
647 if (client
->fd
== -1) {
668 if (client
->fd
!= -1) {
675 static int coroutine_fn
prh_read_request(PRHelperClient
*client
,
676 PRHelperRequest
*req
,
677 PRHelperResponse
*resp
, Error
**errp
)
681 if (prh_read(client
, req
->cdb
, sizeof(req
->cdb
), NULL
) < 0) {
685 if (client
->fd
== -1) {
686 error_setg(errp
, "No file descriptor in request.");
690 if (req
->cdb
[0] != PERSISTENT_RESERVE_OUT
&&
691 req
->cdb
[0] != PERSISTENT_RESERVE_IN
) {
692 error_setg(errp
, "Invalid CDB, closing socket.");
696 sz
= scsi_cdb_xfer(req
->cdb
);
697 if (sz
> sizeof(client
->data
)) {
701 if (req
->cdb
[0] == PERSISTENT_RESERVE_OUT
) {
702 if (qio_channel_read_all(QIO_CHANNEL(client
->ioc
),
703 (char *)client
->data
, sz
,
709 req
->fd
= client
->fd
;
720 static int coroutine_fn
prh_write_response(PRHelperClient
*client
,
721 PRHelperRequest
*req
,
722 PRHelperResponse
*resp
, Error
**errp
)
727 if (req
->cdb
[0] == PERSISTENT_RESERVE_IN
&& resp
->result
== GOOD
) {
728 assert(resp
->sz
<= req
->sz
&& resp
->sz
<= sizeof(client
->data
));
730 assert(resp
->sz
== 0);
735 resp
->result
= cpu_to_be32(resp
->result
);
736 resp
->sz
= cpu_to_be32(resp
->sz
);
737 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
738 (char *) resp
, sizeof(*resp
), errp
);
743 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
744 (char *) client
->data
,
746 return r
< 0 ? r
: 0;
749 static void coroutine_fn
prh_co_entry(void *opaque
)
751 PRHelperClient
*client
= opaque
;
752 Error
*local_err
= NULL
;
756 qio_channel_set_blocking(QIO_CHANNEL(client
->ioc
),
758 qio_channel_attach_aio_context(QIO_CHANNEL(client
->ioc
),
759 qemu_get_aio_context());
761 /* A very simple negotiation for future extensibility. No features
762 * are defined so write 0.
764 flags
= cpu_to_be32(0);
765 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
766 (char *) &flags
, sizeof(flags
), NULL
);
771 r
= qio_channel_read_all(QIO_CHANNEL(client
->ioc
),
772 (char *) &flags
, sizeof(flags
), NULL
);
773 if (be32_to_cpu(flags
) != 0 || r
< 0) {
777 while (atomic_read(&state
) == RUNNING
) {
779 PRHelperResponse resp
;
782 sz
= prh_read_request(client
, &req
, &resp
, &local_err
);
787 num_active_sockets
++;
788 if (req
.cdb
[0] == PERSISTENT_RESERVE_OUT
) {
789 r
= do_pr_out(req
.fd
, req
.cdb
, resp
.sense
,
793 resp
.sz
= sizeof(client
->data
);
794 r
= do_pr_in(req
.fd
, req
.cdb
, resp
.sense
,
795 client
->data
, &resp
.sz
);
796 resp
.sz
= MIN(resp
.sz
, sz
);
798 num_active_sockets
--;
805 if (prh_write_response(client
, &req
, &resp
, &local_err
) < 0) {
812 error_free(local_err
);
814 error_report_err(local_err
);
819 qio_channel_detach_aio_context(QIO_CHANNEL(client
->ioc
));
820 object_unref(OBJECT(client
->ioc
));
824 static gboolean
accept_client(QIOChannel
*ioc
, GIOCondition cond
, gpointer opaque
)
826 QIOChannelSocket
*cioc
;
829 cioc
= qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc
),
835 prh
= g_new(PRHelperClient
, 1);
838 prh
->co
= qemu_coroutine_create(prh_co_entry
, prh
);
839 qemu_coroutine_enter(prh
->co
);
846 * Check socket parameters compatibility when socket activation is used.
848 static const char *socket_activation_validate_opts(void)
850 if (socket_path
!= NULL
) {
851 return "Unix socket can't be set when using socket activation";
857 static void termsig_handler(int signum
)
859 atomic_cmpxchg(&state
, RUNNING
, TERMINATE
);
863 static void close_server_socket(void)
867 g_source_remove(server_watch
);
869 object_unref(OBJECT(server_ioc
));
870 num_active_sockets
--;
874 static int drop_privileges(void)
876 /* clear all capabilities */
877 capng_clear(CAPNG_SELECT_BOTH
);
879 if (capng_update(CAPNG_ADD
, CAPNG_EFFECTIVE
| CAPNG_PERMITTED
,
880 CAP_SYS_RAWIO
) < 0) {
885 /* For /dev/mapper/control ioctls */
886 if (capng_update(CAPNG_ADD
, CAPNG_EFFECTIVE
| CAPNG_PERMITTED
,
887 CAP_SYS_ADMIN
) < 0) {
892 /* Change user/group id, retaining the capabilities. Because file descriptors
893 * are passed via SCM_RIGHTS, we don't need supplementary groups (and in
894 * fact the helper can run as "nobody").
896 if (capng_change_id(uid
!= -1 ? uid
: getuid(),
897 gid
!= -1 ? gid
: getgid(),
898 CAPNG_DROP_SUPP_GRP
| CAPNG_CLEAR_BOUNDING
)) {
906 int main(int argc
, char **argv
)
908 const char *sopt
= "hVk:f:dT:u:g:vq";
909 struct option lopt
[] = {
910 { "help", no_argument
, NULL
, 'h' },
911 { "version", no_argument
, NULL
, 'V' },
912 { "socket", required_argument
, NULL
, 'k' },
913 { "pidfile", required_argument
, NULL
, 'f' },
914 { "daemon", no_argument
, NULL
, 'd' },
915 { "trace", required_argument
, NULL
, 'T' },
916 { "user", required_argument
, NULL
, 'u' },
917 { "group", required_argument
, NULL
, 'g' },
918 { "verbose", no_argument
, NULL
, 'v' },
919 { "quiet", no_argument
, NULL
, 'q' },
926 Error
*local_err
= NULL
;
927 char *trace_file
= NULL
;
928 bool daemonize
= false;
929 bool pidfile_specified
= false;
930 unsigned socket_activation
;
932 struct sigaction sa_sigterm
;
933 memset(&sa_sigterm
, 0, sizeof(sa_sigterm
));
934 sa_sigterm
.sa_handler
= termsig_handler
;
935 sigaction(SIGTERM
, &sa_sigterm
, NULL
);
936 sigaction(SIGINT
, &sa_sigterm
, NULL
);
937 sigaction(SIGHUP
, &sa_sigterm
, NULL
);
939 signal(SIGPIPE
, SIG_IGN
);
941 module_call_init(MODULE_INIT_TRACE
);
942 module_call_init(MODULE_INIT_QOM
);
943 qemu_add_opts(&qemu_trace_opts
);
944 qemu_init_exec_dir(argv
[0]);
946 pidfile
= qemu_get_local_state_pathname("run/qemu-pr-helper.pid");
948 while ((ch
= getopt_long(argc
, argv
, sopt
, lopt
, &opt_ind
)) != -1) {
951 socket_path
= optarg
;
952 if (socket_path
[0] != '/') {
953 error_report("socket path must be absolute");
959 pidfile
= g_strdup(optarg
);
960 pidfile_specified
= true;
965 struct passwd
*userinfo
= getpwnam(optarg
);
967 uid
= userinfo
->pw_uid
;
968 } else if (qemu_strtoul(optarg
, NULL
, 10, &res
) == 0 &&
972 error_report("invalid user '%s'", optarg
);
979 struct group
*groupinfo
= getgrnam(optarg
);
981 gid
= groupinfo
->gr_gid
;
982 } else if (qemu_strtoul(optarg
, NULL
, 10, &res
) == 0 &&
986 error_report("invalid group '%s'", optarg
);
994 error_report("-%c not supported by this %s", ch
, argv
[0]);
1008 trace_file
= trace_opt_parse(optarg
);
1019 error_report("Try `%s --help' for more information.", argv
[0]);
1025 noisy
= !quiet
&& (loglevel
>= 3);
1026 verbose
= quiet
? 0 : MIN(loglevel
, 3);
1028 if (!trace_init_backends()) {
1031 trace_init_file(trace_file
);
1032 qemu_set_log(LOG_TRACE
);
1036 multipath_pr_init();
1039 socket_activation
= check_socket_activation();
1040 if (socket_activation
== 0) {
1041 SocketAddress saddr
;
1042 compute_default_paths();
1043 saddr
= (SocketAddress
){
1044 .type
= SOCKET_ADDRESS_TYPE_UNIX
,
1045 .u
.q_unix
.path
= g_strdup(socket_path
)
1047 server_ioc
= qio_channel_socket_new();
1048 if (qio_channel_socket_listen_sync(server_ioc
, &saddr
, &local_err
) < 0) {
1049 object_unref(OBJECT(server_ioc
));
1050 error_report_err(local_err
);
1053 g_free(saddr
.u
.q_unix
.path
);
1055 /* Using socket activation - check user didn't use -p etc. */
1056 const char *err_msg
= socket_activation_validate_opts();
1057 if (err_msg
!= NULL
) {
1058 error_report("%s", err_msg
);
1062 /* Can only listen on a single socket. */
1063 if (socket_activation
> 1) {
1064 error_report("%s does not support socket activation with LISTEN_FDS > 1",
1068 server_ioc
= qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD
,
1070 if (server_ioc
== NULL
) {
1071 error_report("Failed to use socket activation: %s",
1072 error_get_pretty(local_err
));
1078 if (qemu_init_main_loop(&local_err
)) {
1079 error_report_err(local_err
);
1083 server_watch
= qio_channel_add_watch(QIO_CHANNEL(server_ioc
),
1089 if (daemon(0, 0) < 0) {
1090 error_report("Failed to daemonize: %s", strerror(errno
));
1095 if (daemonize
|| pidfile_specified
)
1098 #ifdef CONFIG_LIBCAP
1099 if (drop_privileges() < 0) {
1100 error_report("Failed to drop privileges: %s", strerror(errno
));
1107 main_loop_wait(false);
1108 if (state
== TERMINATE
) {
1109 state
= TERMINATING
;
1110 close_server_socket();
1112 } while (num_active_sockets
> 0);