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 usage(const char *name
)
80 "Usage: %s [OPTIONS] FILE\n"
81 "Persistent Reservation helper program for QEMU\n"
83 " -h, --help display this help and exit\n"
84 " -V, --version output version information and exit\n"
86 " -d, --daemon run in the background\n"
87 " -f, --pidfile=PATH PID file when running as a daemon\n"
89 " -k, --socket=PATH path to the unix socket\n"
91 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
92 " specify tracing options\n"
94 " -u, --user=USER user to drop privileges to\n"
95 " -g, --group=GROUP group to drop privileges to\n"
99 , name
, pidfile
, socket_path
);
102 static void version(const char *name
)
105 "%s " QEMU_VERSION QEMU_PKGVERSION
"\n"
106 "Written by Paolo Bonzini.\n"
109 "This is free software; see the source for copying conditions. There is NO\n"
110 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
114 static void write_pidfile(void)
119 pidfd
= qemu_open(pidfile
, O_CREAT
|O_WRONLY
, S_IRUSR
|S_IWUSR
);
121 error_report("Cannot open pid file, %s", strerror(errno
));
125 if (lockf(pidfd
, F_TLOCK
, 0)) {
126 error_report("Cannot lock pid file, %s", strerror(errno
));
129 if (ftruncate(pidfd
, 0)) {
130 error_report("Failed to truncate pid file");
134 snprintf(pidstr
, sizeof(pidstr
), "%d\n", getpid());
135 if (write(pidfd
, pidstr
, strlen(pidstr
)) != strlen(pidstr
)) {
136 error_report("Failed to write pid file");
149 typedef struct PRHelperSGIOData
{
154 int sz
; /* input/output */
158 static int do_sgio_worker(void *opaque
)
160 PRHelperSGIOData
*data
= opaque
;
161 struct sg_io_hdr io_hdr
;
164 SCSISense sense_code
;
166 memset(data
->sense
, 0, PR_HELPER_SENSE_SIZE
);
167 memset(&io_hdr
, 0, sizeof(io_hdr
));
168 io_hdr
.interface_id
= 'S';
169 io_hdr
.cmd_len
= PR_HELPER_CDB_SIZE
;
170 io_hdr
.cmdp
= (uint8_t *)data
->cdb
;
171 io_hdr
.sbp
= data
->sense
;
172 io_hdr
.mx_sb_len
= PR_HELPER_SENSE_SIZE
;
174 io_hdr
.dxfer_direction
= data
->dir
;
175 io_hdr
.dxferp
= (char *)data
->buf
;
176 io_hdr
.dxfer_len
= data
->sz
;
177 ret
= ioctl(data
->fd
, SG_IO
, &io_hdr
);
178 status
= sg_io_sense_from_errno(ret
< 0 ? errno
: 0, &io_hdr
,
180 if (status
== GOOD
) {
181 data
->sz
-= io_hdr
.resid
;
186 if (status
== CHECK_CONDITION
&&
187 !(io_hdr
.driver_status
& SG_ERR_DRIVER_SENSE
)) {
188 scsi_build_sense(data
->sense
, sense_code
);
194 static int do_sgio(int fd
, const uint8_t *cdb
, uint8_t *sense
,
195 uint8_t *buf
, int *sz
, int dir
)
197 ThreadPool
*pool
= aio_get_thread_pool(qemu_get_aio_context());
200 PRHelperSGIOData data
= {
209 r
= thread_pool_submit_co(pool
, do_sgio_worker
, &data
);
214 /* Device mapper interface */
217 #define CONTROL_PATH "/dev/mapper/control"
219 typedef struct DMData
{
224 static int control_fd
;
226 static void *dm_ioctl(int ioc
, struct dm_ioctl
*dm
)
229 memcpy(&d
.dm
, dm
, sizeof(d
.dm
));
230 QEMU_BUILD_BUG_ON(sizeof(d
.data
) < sizeof(struct dm_target_spec
));
232 d
.dm
.version
[0] = DM_VERSION_MAJOR
;
235 d
.dm
.data_size
= 1024;
236 d
.dm
.data_start
= offsetof(DMData
, data
);
237 if (ioctl(control_fd
, ioc
, &d
) < 0) {
240 memcpy(dm
, &d
.dm
, sizeof(d
.dm
));
244 static void *dm_dev_ioctl(int fd
, int ioc
, struct dm_ioctl
*dm
)
255 dm
->dev
= st
.st_rdev
;
256 return dm_ioctl(ioc
, dm
);
259 static void dm_init(void)
261 control_fd
= open(CONTROL_PATH
, O_RDWR
);
262 if (control_fd
< 0) {
263 perror("Cannot open " CONTROL_PATH
);
266 struct dm_ioctl dm
= { 0 };
267 if (!dm_ioctl(DM_VERSION
, &dm
)) {
271 if (dm
.version
[0] != DM_VERSION_MAJOR
) {
272 fprintf(stderr
, "Unsupported device mapper interface");
277 /* Variables required by libmultipath and libmpathpersist. */
278 QEMU_BUILD_BUG_ON(PR_HELPER_DATA_SIZE
> MPATH_MAX_PARAM_LEN
);
279 unsigned mpath_mx_alloc_len
= PR_HELPER_DATA_SIZE
;
282 static void multipath_pr_init(void)
284 static struct udev
*udev
;
287 mpath_lib_init(udev
);
290 static int is_mpath(int fd
)
292 struct dm_ioctl dm
= { .flags
= DM_NOFLUSH_FLAG
};
293 struct dm_target_spec
*tgt
;
295 tgt
= dm_dev_ioctl(fd
, DM_TABLE_STATUS
, &dm
);
297 if (errno
== ENXIO
) {
303 return !strncmp(tgt
->target_type
, "multipath", DM_MAX_TYPE_NAME
);
306 static int mpath_reconstruct_sense(int fd
, int r
, uint8_t *sense
)
309 case MPATH_PR_SUCCESS
:
311 case MPATH_PR_SENSE_NOT_READY
:
312 case MPATH_PR_SENSE_MEDIUM_ERROR
:
313 case MPATH_PR_SENSE_HARDWARE_ERROR
:
314 case MPATH_PR_SENSE_ABORTED_COMMAND
:
316 /* libmpathpersist ate the exact sense. Try to find it by
317 * issuing TEST UNIT READY.
319 uint8_t cdb
[6] = { TEST_UNIT_READY
};
321 return do_sgio(fd
, cdb
, sense
, NULL
, &sz
, SG_DXFER_NONE
);
324 case MPATH_PR_SENSE_UNIT_ATTENTION
:
325 /* Congratulations libmpathpersist, you ruined the Unit Attention...
326 * Return a heavyweight one.
328 scsi_build_sense(sense
, SENSE_CODE(SCSI_BUS_RESET
));
329 return CHECK_CONDITION
;
330 case MPATH_PR_SENSE_INVALID_OP
:
331 /* Only one valid sense. */
332 scsi_build_sense(sense
, SENSE_CODE(INVALID_OPCODE
));
333 return CHECK_CONDITION
;
334 case MPATH_PR_ILLEGAL_REQ
:
336 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
337 return CHECK_CONDITION
;
338 case MPATH_PR_NO_SENSE
:
339 scsi_build_sense(sense
, SENSE_CODE(NO_SENSE
));
340 return CHECK_CONDITION
;
342 case MPATH_PR_RESERV_CONFLICT
:
343 return RESERVATION_CONFLICT
;
347 scsi_build_sense(sense
, SENSE_CODE(LUN_COMM_FAILURE
));
348 return CHECK_CONDITION
;
352 static int multipath_pr_in(int fd
, const uint8_t *cdb
, uint8_t *sense
,
353 uint8_t *data
, int sz
)
355 int rq_servact
= cdb
[1];
356 struct prin_resp resp
;
360 switch (rq_servact
) {
361 case MPATH_PRIN_RKEY_SA
:
362 case MPATH_PRIN_RRES_SA
:
363 case MPATH_PRIN_RCAP_SA
:
365 case MPATH_PRIN_RFSTAT_SA
:
366 /* Nobody implements it anyway, so bail out. */
368 /* Cannot parse any other output. */
369 scsi_build_sense(sense
, SENSE_CODE(INVALID_FIELD
));
370 return CHECK_CONDITION
;
373 r
= mpath_persistent_reserve_in(fd
, rq_servact
, &resp
, noisy
, verbose
);
374 if (r
== MPATH_PR_SUCCESS
) {
375 switch (rq_servact
) {
376 case MPATH_PRIN_RKEY_SA
:
377 case MPATH_PRIN_RRES_SA
: {
378 struct prin_readdescr
*out
= &resp
.prin_descriptor
.prin_readkeys
;
380 written
= MIN(out
->additional_length
+ 8, sz
);
381 stl_be_p(&data
[0], out
->prgeneration
);
382 stl_be_p(&data
[4], out
->additional_length
);
383 memcpy(&data
[8], out
->key_list
, written
- 8);
386 case MPATH_PRIN_RCAP_SA
: {
387 struct prin_capdescr
*out
= &resp
.prin_descriptor
.prin_readcap
;
390 stw_be_p(&data
[0], out
->length
);
391 data
[2] = out
->flags
[0];
392 data
[3] = out
->flags
[1];
393 stw_be_p(&data
[4], out
->pr_type_mask
);
397 scsi_build_sense(sense
, SENSE_CODE(INVALID_OPCODE
));
398 return CHECK_CONDITION
;
400 assert(written
<= sz
);
401 memset(data
+ written
, 0, sz
- written
);
404 return mpath_reconstruct_sense(fd
, r
, sense
);
407 static int multipath_pr_out(int fd
, const uint8_t *cdb
, uint8_t *sense
,
408 const uint8_t *param
, int sz
)
410 int rq_servact
= cdb
[1];
411 int rq_scope
= cdb
[2] >> 4;
412 int rq_type
= cdb
[2] & 0xf;
413 struct prout_param_descriptor paramp
;
414 char transportids
[PR_HELPER_DATA_SIZE
];
417 switch (rq_servact
) {
418 case MPATH_PROUT_REG_SA
:
419 case MPATH_PROUT_RES_SA
:
420 case MPATH_PROUT_REL_SA
:
421 case MPATH_PROUT_CLEAR_SA
:
422 case MPATH_PROUT_PREE_SA
:
423 case MPATH_PROUT_PREE_AB_SA
:
424 case MPATH_PROUT_REG_IGN_SA
:
426 case MPATH_PROUT_REG_MOV_SA
:
427 /* Not supported by struct prout_param_descriptor. */
429 /* Cannot parse any other input. */
430 scsi_build_sense(sense
, SENSE_CODE(INVALID_FIELD
));
431 return CHECK_CONDITION
;
434 /* Convert input data, especially transport IDs, to the structs
435 * used by libmpathpersist (which, of course, will immediately
438 memset(¶mp
, 0, sizeof(paramp
));
439 memcpy(¶mp
.key
, ¶m
[0], 8);
440 memcpy(¶mp
.sa_key
, ¶m
[8], 8);
441 paramp
.sa_flags
= param
[10];
442 if (sz
> PR_OUT_FIXED_PARAM_SIZE
) {
443 size_t transportid_len
;
445 if (sz
< PR_OUT_FIXED_PARAM_SIZE
+ 4) {
446 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM_LEN
));
447 return CHECK_CONDITION
;
449 transportid_len
= ldl_be_p(¶m
[24]) + PR_OUT_FIXED_PARAM_SIZE
+ 4;
450 if (transportid_len
> sz
) {
451 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
452 return CHECK_CONDITION
;
454 for (i
= PR_OUT_FIXED_PARAM_SIZE
+ 4, j
= 0; i
< transportid_len
; ) {
455 struct transportid
*id
= (struct transportid
*) &transportids
[j
];
458 id
->format_code
= param
[i
] & 0xc0;
459 id
->protocol_id
= param
[i
] & 0x0f;
460 switch (param
[i
] & 0xcf) {
463 if (i
+ 24 > transportid_len
) {
466 memcpy(id
->n_port_name
, ¶m
[i
+ 8], 8);
467 j
+= offsetof(struct transportid
, n_port_name
[8]);
472 /* iSCSI transport. */
473 len
= lduw_be_p(¶m
[i
+ 2]);
474 if (len
> 252 || (len
& 3) || i
+ len
+ 4 > transportid_len
) {
475 /* For format code 00, the standard says the maximum is 223
476 * plus the NUL terminator. For format code 01 there is no
477 * maximum length, but libmpathpersist ignores the first
478 * byte of id->iscsi_name so our maximum is 252.
482 if (memchr(¶m
[i
+ 4], 0, len
) == NULL
) {
485 memcpy(id
->iscsi_name
, ¶m
[i
+ 2], len
+ 2);
486 j
+= offsetof(struct transportid
, iscsi_name
[len
+ 2]);
491 if (i
+ 24 > transportid_len
) {
494 memcpy(id
->sas_address
, ¶m
[i
+ 4], 8);
495 j
+= offsetof(struct transportid
, sas_address
[8]);
500 scsi_build_sense(sense
, SENSE_CODE(INVALID_PARAM
));
501 return CHECK_CONDITION
;
504 paramp
.trnptid_list
[paramp
.num_transportid
++] = id
;
508 r
= mpath_persistent_reserve_out(fd
, rq_servact
, rq_scope
, rq_type
,
509 ¶mp
, noisy
, verbose
);
510 return mpath_reconstruct_sense(fd
, r
, sense
);
514 static int do_pr_in(int fd
, const uint8_t *cdb
, uint8_t *sense
,
515 uint8_t *data
, int *resp_sz
)
519 /* multipath_pr_in fills the whole input buffer. */
520 return multipath_pr_in(fd
, cdb
, sense
, data
, *resp_sz
);
524 return do_sgio(fd
, cdb
, sense
, data
, resp_sz
,
528 static int do_pr_out(int fd
, const uint8_t *cdb
, uint8_t *sense
,
529 const uint8_t *param
, int sz
)
534 return multipath_pr_out(fd
, cdb
, sense
, param
, sz
);
539 return do_sgio(fd
, cdb
, sense
, (uint8_t *)param
, &resp_sz
,
545 typedef struct PRHelperClient
{
546 QIOChannelSocket
*ioc
;
549 uint8_t data
[PR_HELPER_DATA_SIZE
];
552 typedef struct PRHelperRequest
{
555 uint8_t cdb
[PR_HELPER_CDB_SIZE
];
558 static int coroutine_fn
prh_read(PRHelperClient
*client
, void *buf
, int sz
,
572 n_read
= qio_channel_readv_full(QIO_CHANNEL(client
->ioc
), &iov
, 1,
575 if (n_read
== QIO_CHANNEL_ERR_BLOCK
) {
576 qio_channel_yield(QIO_CHANNEL(client
->ioc
), G_IO_IN
);
580 ret
= n_read
? n_read
: -1;
584 /* Stash one file descriptor per request. */
586 bool too_many
= false;
587 for (i
= 0; i
< nfds
; i
++) {
588 if (client
->fd
== -1) {
609 if (client
->fd
!= -1) {
616 static int coroutine_fn
prh_read_request(PRHelperClient
*client
,
617 PRHelperRequest
*req
,
618 PRHelperResponse
*resp
, Error
**errp
)
622 if (prh_read(client
, req
->cdb
, sizeof(req
->cdb
), NULL
) < 0) {
626 if (client
->fd
== -1) {
627 error_setg(errp
, "No file descriptor in request.");
631 if (req
->cdb
[0] != PERSISTENT_RESERVE_OUT
&&
632 req
->cdb
[0] != PERSISTENT_RESERVE_IN
) {
633 error_setg(errp
, "Invalid CDB, closing socket.");
637 sz
= scsi_cdb_xfer(req
->cdb
);
638 if (sz
> sizeof(client
->data
)) {
642 if (req
->cdb
[0] == PERSISTENT_RESERVE_OUT
) {
643 if (qio_channel_read_all(QIO_CHANNEL(client
->ioc
),
644 (char *)client
->data
, sz
,
648 if ((fcntl(client
->fd
, F_GETFL
) & O_ACCMODE
) == O_RDONLY
) {
649 scsi_build_sense(resp
->sense
, SENSE_CODE(INVALID_OPCODE
));
651 } else if (sz
< PR_OUT_FIXED_PARAM_SIZE
) {
652 /* Illegal request, Parameter list length error. This isn't fatal;
653 * we have read the data, send an error without closing the socket.
655 scsi_build_sense(resp
->sense
, SENSE_CODE(INVALID_PARAM_LEN
));
659 resp
->result
= CHECK_CONDITION
;
665 req
->fd
= client
->fd
;
676 static int coroutine_fn
prh_write_response(PRHelperClient
*client
,
677 PRHelperRequest
*req
,
678 PRHelperResponse
*resp
, Error
**errp
)
683 if (req
->cdb
[0] == PERSISTENT_RESERVE_IN
&& resp
->result
== GOOD
) {
684 assert(resp
->sz
<= req
->sz
&& resp
->sz
<= sizeof(client
->data
));
686 assert(resp
->sz
== 0);
691 resp
->result
= cpu_to_be32(resp
->result
);
692 resp
->sz
= cpu_to_be32(resp
->sz
);
693 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
694 (char *) resp
, sizeof(*resp
), errp
);
699 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
700 (char *) client
->data
,
702 return r
< 0 ? r
: 0;
705 static void coroutine_fn
prh_co_entry(void *opaque
)
707 PRHelperClient
*client
= opaque
;
708 Error
*local_err
= NULL
;
712 qio_channel_set_blocking(QIO_CHANNEL(client
->ioc
),
714 qio_channel_attach_aio_context(QIO_CHANNEL(client
->ioc
),
715 qemu_get_aio_context());
717 /* A very simple negotiation for future extensibility. No features
718 * are defined so write 0.
720 flags
= cpu_to_be32(0);
721 r
= qio_channel_write_all(QIO_CHANNEL(client
->ioc
),
722 (char *) &flags
, sizeof(flags
), NULL
);
727 r
= qio_channel_read_all(QIO_CHANNEL(client
->ioc
),
728 (char *) &flags
, sizeof(flags
), NULL
);
729 if (be32_to_cpu(flags
) != 0 || r
< 0) {
733 while (atomic_read(&state
) == RUNNING
) {
735 PRHelperResponse resp
;
738 sz
= prh_read_request(client
, &req
, &resp
, &local_err
);
744 num_active_sockets
++;
745 if (req
.cdb
[0] == PERSISTENT_RESERVE_OUT
) {
746 r
= do_pr_out(req
.fd
, req
.cdb
, resp
.sense
,
750 resp
.sz
= sizeof(client
->data
);
751 r
= do_pr_in(req
.fd
, req
.cdb
, resp
.sense
,
752 client
->data
, &resp
.sz
);
753 resp
.sz
= MIN(resp
.sz
, sz
);
755 num_active_sockets
--;
763 if (prh_write_response(client
, &req
, &resp
, &local_err
) < 0) {
770 error_free(local_err
);
772 error_report_err(local_err
);
777 qio_channel_detach_aio_context(QIO_CHANNEL(client
->ioc
));
778 object_unref(OBJECT(client
->ioc
));
782 static gboolean
accept_client(QIOChannel
*ioc
, GIOCondition cond
, gpointer opaque
)
784 QIOChannelSocket
*cioc
;
787 cioc
= qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc
),
793 prh
= g_new(PRHelperClient
, 1);
796 prh
->co
= qemu_coroutine_create(prh_co_entry
, prh
);
797 qemu_coroutine_enter(prh
->co
);
804 * Check socket parameters compatibility when socket activation is used.
806 static const char *socket_activation_validate_opts(void)
808 if (socket_path
!= NULL
) {
809 return "Unix socket can't be set when using socket activation";
815 static void compute_default_paths(void)
818 socket_path
= qemu_get_local_state_pathname("run/qemu-pr-helper.sock");
822 static void termsig_handler(int signum
)
824 atomic_cmpxchg(&state
, RUNNING
, TERMINATE
);
828 static void close_server_socket(void)
832 g_source_remove(server_watch
);
834 object_unref(OBJECT(server_ioc
));
835 num_active_sockets
--;
839 static int drop_privileges(void)
841 /* clear all capabilities */
842 capng_clear(CAPNG_SELECT_BOTH
);
844 if (capng_update(CAPNG_ADD
, CAPNG_EFFECTIVE
| CAPNG_PERMITTED
,
845 CAP_SYS_RAWIO
) < 0) {
850 /* For /dev/mapper/control ioctls */
851 if (capng_update(CAPNG_ADD
, CAPNG_EFFECTIVE
| CAPNG_PERMITTED
,
852 CAP_SYS_ADMIN
) < 0) {
857 /* Change user/group id, retaining the capabilities. Because file descriptors
858 * are passed via SCM_RIGHTS, we don't need supplementary groups (and in
859 * fact the helper can run as "nobody").
861 if (capng_change_id(uid
!= -1 ? uid
: getuid(),
862 gid
!= -1 ? gid
: getgid(),
863 CAPNG_DROP_SUPP_GRP
| CAPNG_CLEAR_BOUNDING
)) {
871 int main(int argc
, char **argv
)
873 const char *sopt
= "hVk:fdT:u:g:vq";
874 struct option lopt
[] = {
875 { "help", no_argument
, NULL
, 'h' },
876 { "version", no_argument
, NULL
, 'V' },
877 { "socket", required_argument
, NULL
, 'k' },
878 { "pidfile", no_argument
, NULL
, 'f' },
879 { "daemon", no_argument
, NULL
, 'd' },
880 { "trace", required_argument
, NULL
, 'T' },
881 { "user", required_argument
, NULL
, 'u' },
882 { "group", required_argument
, NULL
, 'g' },
883 { "verbose", no_argument
, NULL
, 'v' },
884 { "quiet", no_argument
, NULL
, 'q' },
891 Error
*local_err
= NULL
;
892 char *trace_file
= NULL
;
893 bool daemonize
= false;
894 unsigned socket_activation
;
896 struct sigaction sa_sigterm
;
897 memset(&sa_sigterm
, 0, sizeof(sa_sigterm
));
898 sa_sigterm
.sa_handler
= termsig_handler
;
899 sigaction(SIGTERM
, &sa_sigterm
, NULL
);
900 sigaction(SIGINT
, &sa_sigterm
, NULL
);
901 sigaction(SIGHUP
, &sa_sigterm
, NULL
);
903 signal(SIGPIPE
, SIG_IGN
);
905 module_call_init(MODULE_INIT_TRACE
);
906 module_call_init(MODULE_INIT_QOM
);
907 qemu_add_opts(&qemu_trace_opts
);
908 qemu_init_exec_dir(argv
[0]);
910 pidfile
= qemu_get_local_state_pathname("run/qemu-pr-helper.pid");
912 while ((ch
= getopt_long(argc
, argv
, sopt
, lopt
, &opt_ind
)) != -1) {
915 socket_path
= optarg
;
916 if (socket_path
[0] != '/') {
917 error_report("socket path must be absolute");
927 struct passwd
*userinfo
= getpwnam(optarg
);
929 uid
= userinfo
->pw_uid
;
930 } else if (qemu_strtoul(optarg
, NULL
, 10, &res
) == 0 &&
934 error_report("invalid user '%s'", optarg
);
941 struct group
*groupinfo
= getgrnam(optarg
);
943 gid
= groupinfo
->gr_gid
;
944 } else if (qemu_strtoul(optarg
, NULL
, 10, &res
) == 0 &&
948 error_report("invalid group '%s'", optarg
);
956 error_report("-%c not supported by this %s", ch
, argv
[0]);
970 trace_file
= trace_opt_parse(optarg
);
981 error_report("Try `%s --help' for more information.", argv
[0]);
987 noisy
= !quiet
&& (loglevel
>= 3);
988 verbose
= quiet
? 0 : MIN(loglevel
, 3);
990 if (!trace_init_backends()) {
993 trace_init_file(trace_file
);
994 qemu_set_log(LOG_TRACE
);
1001 socket_activation
= check_socket_activation();
1002 if (socket_activation
== 0) {
1003 SocketAddress saddr
;
1004 compute_default_paths();
1005 saddr
= (SocketAddress
){
1006 .type
= SOCKET_ADDRESS_TYPE_UNIX
,
1007 .u
.q_unix
.path
= g_strdup(socket_path
)
1009 server_ioc
= qio_channel_socket_new();
1010 if (qio_channel_socket_listen_sync(server_ioc
, &saddr
, &local_err
) < 0) {
1011 object_unref(OBJECT(server_ioc
));
1012 error_report_err(local_err
);
1015 g_free(saddr
.u
.q_unix
.path
);
1017 /* Using socket activation - check user didn't use -p etc. */
1018 const char *err_msg
= socket_activation_validate_opts();
1019 if (err_msg
!= NULL
) {
1020 error_report("%s", err_msg
);
1024 /* Can only listen on a single socket. */
1025 if (socket_activation
> 1) {
1026 error_report("%s does not support socket activation with LISTEN_FDS > 1",
1030 server_ioc
= qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD
,
1032 if (server_ioc
== NULL
) {
1033 error_report("Failed to use socket activation: %s",
1034 error_get_pretty(local_err
));
1040 if (qemu_init_main_loop(&local_err
)) {
1041 error_report_err(local_err
);
1045 server_watch
= qio_channel_add_watch(QIO_CHANNEL(server_ioc
),
1050 #ifdef CONFIG_LIBCAP
1051 if (drop_privileges() < 0) {
1052 error_report("Failed to drop privileges: %s", strerror(errno
));
1058 if (daemon(0, 0) < 0) {
1059 error_report("Failed to daemonize: %s", strerror(errno
));
1067 main_loop_wait(false);
1068 if (state
== TERMINATE
) {
1069 state
= TERMINATING
;
1070 close_server_socket();
1072 } while (num_active_sockets
> 0);