1 /* SPDX-License-Identifier: GPL-2.0-or-later */
14 #include "alloc-util.h"
15 #include "device-private.h"
16 #include "device-util.h"
19 #include "format-util.h"
20 #include "netif-naming-scheme.h"
21 #include "netlink-util.h"
22 #include "parse-util.h"
23 #include "path-util.h"
24 #include "process-util.h"
25 #include "rlimit-util.h"
26 #include "signal-util.h"
27 #include "stdio-util.h"
28 #include "string-util.h"
31 #include "udev-builtin.h"
32 #include "udev-event.h"
33 #include "udev-netlink.h"
34 #include "udev-node.h"
35 #include "udev-util.h"
36 #include "udev-watch.h"
37 #include "user-util.h"
39 typedef struct Spawn
{
43 usec_t timeout_warn_usec
;
46 usec_t event_birth_usec
;
56 UdevEvent
*udev_event_new(sd_device
*dev
, usec_t exec_delay_usec
, sd_netlink
*rtnl
, int log_level
) {
61 event
= new(UdevEvent
, 1);
65 *event
= (UdevEvent
) {
66 .dev
= sd_device_ref(dev
),
67 .birth_usec
= now(CLOCK_MONOTONIC
),
68 .exec_delay_usec
= exec_delay_usec
,
69 .rtnl
= sd_netlink_ref(rtnl
),
73 .log_level_was_debug
= log_level
== LOG_DEBUG
,
74 .default_log_level
= log_level
,
80 UdevEvent
*udev_event_free(UdevEvent
*event
) {
84 sd_device_unref(event
->dev
);
85 sd_device_unref(event
->dev_db_clone
);
86 sd_netlink_unref(event
->rtnl
);
87 ordered_hashmap_free_free_key(event
->run_list
);
88 ordered_hashmap_free_free_free(event
->seclabel_list
);
89 free(event
->program_result
);
100 FORMAT_SUBST_KERNEL_NUMBER
,
102 FORMAT_SUBST_DEVPATH
,
112 _FORMAT_SUBST_TYPE_MAX
,
113 _FORMAT_SUBST_TYPE_INVALID
= -EINVAL
,
114 } FormatSubstitutionType
;
116 struct subst_map_entry
{
119 FormatSubstitutionType type
;
122 static const struct subst_map_entry map
[] = {
123 { .name
= "devnode", .fmt
= 'N', .type
= FORMAT_SUBST_DEVNODE
},
124 { .name
= "tempnode", .fmt
= 'N', .type
= FORMAT_SUBST_DEVNODE
}, /* deprecated */
125 { .name
= "attr", .fmt
= 's', .type
= FORMAT_SUBST_ATTR
},
126 { .name
= "sysfs", .fmt
= 's', .type
= FORMAT_SUBST_ATTR
}, /* deprecated */
127 { .name
= "env", .fmt
= 'E', .type
= FORMAT_SUBST_ENV
},
128 { .name
= "kernel", .fmt
= 'k', .type
= FORMAT_SUBST_KERNEL
},
129 { .name
= "number", .fmt
= 'n', .type
= FORMAT_SUBST_KERNEL_NUMBER
},
130 { .name
= "driver", .fmt
= 'd', .type
= FORMAT_SUBST_DRIVER
},
131 { .name
= "devpath", .fmt
= 'p', .type
= FORMAT_SUBST_DEVPATH
},
132 { .name
= "id", .fmt
= 'b', .type
= FORMAT_SUBST_ID
},
133 { .name
= "major", .fmt
= 'M', .type
= FORMAT_SUBST_MAJOR
},
134 { .name
= "minor", .fmt
= 'm', .type
= FORMAT_SUBST_MINOR
},
135 { .name
= "result", .fmt
= 'c', .type
= FORMAT_SUBST_RESULT
},
136 { .name
= "parent", .fmt
= 'P', .type
= FORMAT_SUBST_PARENT
},
137 { .name
= "name", .fmt
= 'D', .type
= FORMAT_SUBST_NAME
},
138 { .name
= "links", .fmt
= 'L', .type
= FORMAT_SUBST_LINKS
},
139 { .name
= "root", .fmt
= 'r', .type
= FORMAT_SUBST_ROOT
},
140 { .name
= "sys", .fmt
= 'S', .type
= FORMAT_SUBST_SYS
},
143 static const char *format_type_to_string(FormatSubstitutionType t
) {
144 for (size_t i
= 0; i
< ELEMENTSOF(map
); i
++)
145 if (map
[i
].type
== t
)
150 static char format_type_to_char(FormatSubstitutionType t
) {
151 for (size_t i
= 0; i
< ELEMENTSOF(map
); i
++)
152 if (map
[i
].type
== t
)
157 static int get_subst_type(const char **str
, bool strict
, FormatSubstitutionType
*ret_type
, char ret_attr
[static UDEV_PATH_SIZE
]) {
158 const char *p
= *str
, *q
= NULL
;
172 for (i
= 0; i
< ELEMENTSOF(map
); i
++)
173 if ((q
= startswith(p
, map
[i
].name
)))
175 } else if (*p
== '%') {
182 for (i
= 0; i
< ELEMENTSOF(map
); i
++)
183 if (*p
== map
[i
].fmt
) {
190 /* When 'strict' flag is set, then '$' and '%' must be escaped. */
191 return strict
? -EINVAL
: 0;
194 const char *start
, *end
;
198 end
= strchr(start
, '}');
203 if (len
== 0 || len
>= UDEV_PATH_SIZE
)
206 strnscpy(ret_attr
, UDEV_PATH_SIZE
, start
, len
);
212 *ret_type
= map
[i
].type
;
216 static int safe_atou_optional_plus(const char *s
, unsigned *ret
) {
223 /* Returns 1 if plus, 0 if no plus, negative on error */
225 p
= endswith(s
, "+");
227 s
= strndupa_safe(s
, p
- s
);
229 r
= safe_atou(s
, ret
);
236 static ssize_t
udev_event_subst_format(
238 FormatSubstitutionType type
,
242 bool *ret_truncated
) {
244 sd_device
*parent
, *dev
= event
->dev
;
245 const char *val
= NULL
;
246 bool truncated
= false;
251 case FORMAT_SUBST_DEVPATH
:
252 r
= sd_device_get_devpath(dev
, &val
);
255 strpcpy_full(&s
, l
, val
, &truncated
);
257 case FORMAT_SUBST_KERNEL
:
258 r
= sd_device_get_sysname(dev
, &val
);
261 strpcpy_full(&s
, l
, val
, &truncated
);
263 case FORMAT_SUBST_KERNEL_NUMBER
:
264 r
= sd_device_get_sysnum(dev
, &val
);
269 strpcpy_full(&s
, l
, val
, &truncated
);
271 case FORMAT_SUBST_ID
:
272 if (!event
->dev_parent
)
274 r
= sd_device_get_sysname(event
->dev_parent
, &val
);
277 strpcpy_full(&s
, l
, val
, &truncated
);
279 case FORMAT_SUBST_DRIVER
:
280 if (!event
->dev_parent
)
282 r
= sd_device_get_driver(event
->dev_parent
, &val
);
287 strpcpy_full(&s
, l
, val
, &truncated
);
289 case FORMAT_SUBST_MAJOR
:
290 case FORMAT_SUBST_MINOR
: {
293 r
= sd_device_get_devnum(dev
, &devnum
);
294 if (r
< 0 && r
!= -ENOENT
)
296 strpcpyf_full(&s
, l
, &truncated
, "%u", r
< 0 ? 0 : type
== FORMAT_SUBST_MAJOR
? major(devnum
) : minor(devnum
));
299 case FORMAT_SUBST_RESULT
: {
300 unsigned index
= 0; /* 0 means whole string */
303 if (!event
->program_result
)
306 if (!isempty(attr
)) {
307 r
= safe_atou_optional_plus(attr
, &index
);
315 strpcpy_full(&s
, l
, event
->program_result
, &truncated
);
317 const char *start
, *p
;
320 p
= skip_leading_chars(event
->program_result
, NULL
);
322 for (i
= 1; i
< index
; i
++) {
323 while (*p
&& !strchr(WHITESPACE
, *p
))
325 p
= skip_leading_chars(p
, NULL
);
330 log_device_debug(dev
, "requested part of result string not found");
335 /* %c{2+} copies the whole string from the second part on */
337 strpcpy_full(&s
, l
, start
, &truncated
);
339 while (*p
&& !strchr(WHITESPACE
, *p
))
341 strnpcpy_full(&s
, l
, start
, p
- start
, &truncated
);
346 case FORMAT_SUBST_ATTR
: {
347 char vbuf
[UDEV_NAME_SIZE
];
354 /* try to read the value specified by "[dmi/id]product_name" */
355 if (udev_resolve_subsys_kernel(attr
, vbuf
, sizeof(vbuf
), true) == 0)
358 /* try to read the attribute the device */
360 (void) device_get_sysattr_value_maybe_from_netlink(dev
, &event
->rtnl
, attr
, &val
);
362 /* try to read the attribute of the parent device, other matches have selected */
363 if (!val
&& event
->dev_parent
&& event
->dev_parent
!= dev
)
364 (void) device_get_sysattr_value_maybe_from_netlink(event
->dev_parent
, &event
->rtnl
, attr
, &val
);
369 /* strip trailing whitespace, and replace unwanted characters */
371 strscpy_full(vbuf
, sizeof(vbuf
), val
, &truncated
);
372 delete_trailing_chars(vbuf
, NULL
);
373 count
= udev_replace_chars(vbuf
, UDEV_ALLOWED_CHARS_INPUT
);
375 log_device_debug(dev
, "%i character(s) replaced", count
);
376 strpcpy_full(&s
, l
, vbuf
, &t
);
377 truncated
= truncated
|| t
;
380 case FORMAT_SUBST_PARENT
:
381 r
= sd_device_get_parent(dev
, &parent
);
386 r
= sd_device_get_devname(parent
, &val
);
391 strpcpy_full(&s
, l
, val
+ STRLEN("/dev/"), &truncated
);
393 case FORMAT_SUBST_DEVNODE
:
394 r
= sd_device_get_devname(dev
, &val
);
399 strpcpy_full(&s
, l
, val
, &truncated
);
401 case FORMAT_SUBST_NAME
:
403 strpcpy_full(&s
, l
, event
->name
, &truncated
);
404 else if (sd_device_get_devname(dev
, &val
) >= 0)
405 strpcpy_full(&s
, l
, val
+ STRLEN("/dev/"), &truncated
);
407 r
= sd_device_get_sysname(dev
, &val
);
410 strpcpy_full(&s
, l
, val
, &truncated
);
413 case FORMAT_SUBST_LINKS
:
414 FOREACH_DEVICE_DEVLINK(dev
, val
) {
416 strpcpy_full(&s
, l
, val
+ STRLEN("/dev/"), &truncated
);
418 strpcpyl_full(&s
, l
, &truncated
, " ", val
+ STRLEN("/dev/"), NULL
);
425 case FORMAT_SUBST_ROOT
:
426 strpcpy_full(&s
, l
, "/dev", &truncated
);
428 case FORMAT_SUBST_SYS
:
429 strpcpy_full(&s
, l
, "/sys", &truncated
);
431 case FORMAT_SUBST_ENV
:
434 r
= sd_device_get_property_value(dev
, attr
, &val
);
439 strpcpy_full(&s
, l
, val
, &truncated
);
442 assert_not_reached();
446 *ret_truncated
= truncated
;
452 *ret_truncated
= truncated
;
458 size_t udev_event_apply_format(
463 bool replace_whitespace
,
464 bool *ret_truncated
) {
466 bool truncated
= false;
467 const char *s
= ASSERT_PTR(src
);
476 FormatSubstitutionType type
;
477 char attr
[UDEV_PATH_SIZE
];
481 r
= get_subst_type(&s
, false, &type
, attr
);
483 log_device_warning_errno(event
->dev
, r
, "Invalid format string, ignoring: %s", src
);
487 /* need space for this char and the terminating NUL */
496 subst_len
= udev_event_subst_format(event
, type
, attr
, dest
, size
, &t
);
498 log_device_warning_errno(event
->dev
, subst_len
,
499 "Failed to substitute variable '$%s' or apply format '%%%c', ignoring: %m",
500 format_type_to_string(type
), format_type_to_char(type
));
504 truncated
= truncated
|| t
;
506 /* FORMAT_SUBST_RESULT handles spaces itself */
507 if (replace_whitespace
&& type
!= FORMAT_SUBST_RESULT
)
508 /* udev_replace_whitespace can replace in-place,
509 * and does nothing if subst_len == 0 */
510 subst_len
= udev_replace_whitespace(dest
, dest
, subst_len
);
519 *ret_truncated
= truncated
;
525 int udev_check_format(const char *value
, size_t *offset
, const char **hint
) {
526 FormatSubstitutionType type
;
527 const char *s
= value
;
528 char attr
[UDEV_PATH_SIZE
];
532 r
= get_subst_type(&s
, true, &type
, attr
);
537 *hint
= "invalid substitution type";
544 if (IN_SET(type
, FORMAT_SUBST_ATTR
, FORMAT_SUBST_ENV
) && isempty(attr
)) {
548 *hint
= "attribute value missing";
552 if (type
== FORMAT_SUBST_RESULT
&& !isempty(attr
)) {
555 r
= safe_atou_optional_plus(attr
, &i
);
560 *hint
= "attribute value not a valid number";
569 static int on_spawn_io(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
570 Spawn
*spawn
= ASSERT_PTR(userdata
);
576 assert(fd
== spawn
->fd_stdout
|| fd
== spawn
->fd_stderr
);
577 assert(!spawn
->result
|| spawn
->result_len
< spawn
->result_size
);
579 if (fd
== spawn
->fd_stdout
&& spawn
->result
) {
580 p
= spawn
->result
+ spawn
->result_len
;
581 size
= spawn
->result_size
- spawn
->result_len
;
587 l
= read(fd
, p
, size
- (p
== buf
));
592 log_device_error_errno(spawn
->device
, errno
,
593 "Failed to read stdout of '%s': %m", spawn
->cmd
);
598 if ((size_t) l
== size
) {
599 log_device_warning(spawn
->device
, "Truncating stdout of '%s' up to %zu byte.",
600 spawn
->cmd
, spawn
->result_size
);
602 spawn
->truncated
= true;
606 if (fd
== spawn
->fd_stdout
&& spawn
->result
)
607 spawn
->result_len
+= l
;
609 /* Log output only if we watch stderr. */
610 if (l
> 0 && spawn
->fd_stderr
>= 0) {
611 _cleanup_strv_free_
char **v
= NULL
;
613 r
= strv_split_newlines_full(&v
, p
, EXTRACT_RETAIN_ESCAPE
);
615 log_device_debug(spawn
->device
,
616 "Failed to split output from '%s'(%s), ignoring: %m",
617 spawn
->cmd
, fd
== spawn
->fd_stdout
? "out" : "err");
620 log_device_debug(spawn
->device
, "'%s'(%s) '%s'", spawn
->cmd
,
621 fd
== spawn
->fd_stdout
? "out" : "err", *q
);
624 if (l
== 0 || spawn
->truncated
)
628 /* Re-enable the event source if we did not encounter EOF */
630 r
= sd_event_source_set_enabled(s
, SD_EVENT_ONESHOT
);
632 log_device_error_errno(spawn
->device
, r
,
633 "Failed to reactivate IO source of '%s'", spawn
->cmd
);
637 static int on_spawn_timeout(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
638 Spawn
*spawn
= ASSERT_PTR(userdata
);
640 DEVICE_TRACE_POINT(spawn_timeout
, spawn
->device
, spawn
->cmd
);
642 kill_and_sigcont(spawn
->pid
, spawn
->timeout_signal
);
644 log_device_error(spawn
->device
, "Spawned process '%s' ["PID_FMT
"] timed out after %s, killing",
645 spawn
->cmd
, spawn
->pid
,
646 FORMAT_TIMESPAN(spawn
->timeout_usec
, USEC_PER_SEC
));
651 static int on_spawn_timeout_warning(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
652 Spawn
*spawn
= ASSERT_PTR(userdata
);
654 log_device_warning(spawn
->device
, "Spawned process '%s' ["PID_FMT
"] is taking longer than %s to complete",
655 spawn
->cmd
, spawn
->pid
,
656 FORMAT_TIMESPAN(spawn
->timeout_warn_usec
, USEC_PER_SEC
));
661 static int on_spawn_sigchld(sd_event_source
*s
, const siginfo_t
*si
, void *userdata
) {
662 Spawn
*spawn
= ASSERT_PTR(userdata
);
665 switch (si
->si_code
) {
667 if (si
->si_status
== 0)
668 log_device_debug(spawn
->device
, "Process '%s' succeeded.", spawn
->cmd
);
670 log_device_full(spawn
->device
, spawn
->accept_failure
? LOG_DEBUG
: LOG_WARNING
,
671 "Process '%s' failed with exit code %i.", spawn
->cmd
, si
->si_status
);
676 log_device_error(spawn
->device
, "Process '%s' terminated by signal %s.", spawn
->cmd
, signal_to_string(si
->si_status
));
679 log_device_error(spawn
->device
, "Process '%s' failed due to unknown reason.", spawn
->cmd
);
682 DEVICE_TRACE_POINT(spawn_exit
, spawn
->device
, spawn
->cmd
);
684 sd_event_exit(sd_event_source_get_event(s
), ret
);
688 static int spawn_wait(Spawn
*spawn
) {
689 _cleanup_(sd_event_unrefp
) sd_event
*e
= NULL
;
690 _cleanup_(sd_event_source_disable_unrefp
) sd_event_source
*sigchld_source
= NULL
;
691 _cleanup_(sd_event_source_disable_unrefp
) sd_event_source
*stdout_source
= NULL
;
692 _cleanup_(sd_event_source_disable_unrefp
) sd_event_source
*stderr_source
= NULL
;
697 r
= sd_event_new(&e
);
699 return log_device_debug_errno(spawn
->device
, r
, "Failed to allocate sd-event object: %m");
701 if (spawn
->timeout_usec
> 0) {
702 usec_t usec
, age_usec
;
704 usec
= now(CLOCK_MONOTONIC
);
705 age_usec
= usec
- spawn
->event_birth_usec
;
706 if (age_usec
< spawn
->timeout_usec
) {
707 if (spawn
->timeout_warn_usec
> 0 &&
708 spawn
->timeout_warn_usec
< spawn
->timeout_usec
&&
709 spawn
->timeout_warn_usec
> age_usec
) {
710 spawn
->timeout_warn_usec
-= age_usec
;
712 r
= sd_event_add_time(e
, NULL
, CLOCK_MONOTONIC
,
713 usec
+ spawn
->timeout_warn_usec
, USEC_PER_SEC
,
714 on_spawn_timeout_warning
, spawn
);
716 return log_device_debug_errno(spawn
->device
, r
, "Failed to create timeout warning event source: %m");
719 spawn
->timeout_usec
-= age_usec
;
721 r
= sd_event_add_time(e
, NULL
, CLOCK_MONOTONIC
,
722 usec
+ spawn
->timeout_usec
, USEC_PER_SEC
, on_spawn_timeout
, spawn
);
724 return log_device_debug_errno(spawn
->device
, r
, "Failed to create timeout event source: %m");
728 if (spawn
->fd_stdout
>= 0) {
729 r
= sd_event_add_io(e
, &stdout_source
, spawn
->fd_stdout
, EPOLLIN
, on_spawn_io
, spawn
);
731 return log_device_debug_errno(spawn
->device
, r
, "Failed to create stdio event source: %m");
732 r
= sd_event_source_set_enabled(stdout_source
, SD_EVENT_ONESHOT
);
734 return log_device_debug_errno(spawn
->device
, r
, "Failed to enable stdio event source: %m");
737 if (spawn
->fd_stderr
>= 0) {
738 r
= sd_event_add_io(e
, &stderr_source
, spawn
->fd_stderr
, EPOLLIN
, on_spawn_io
, spawn
);
740 return log_device_debug_errno(spawn
->device
, r
, "Failed to create stderr event source: %m");
741 r
= sd_event_source_set_enabled(stderr_source
, SD_EVENT_ONESHOT
);
743 return log_device_debug_errno(spawn
->device
, r
, "Failed to enable stderr event source: %m");
746 r
= sd_event_add_child(e
, &sigchld_source
, spawn
->pid
, WEXITED
, on_spawn_sigchld
, spawn
);
748 return log_device_debug_errno(spawn
->device
, r
, "Failed to create sigchild event source: %m");
749 /* SIGCHLD should be processed after IO is complete */
750 r
= sd_event_source_set_priority(sigchld_source
, SD_EVENT_PRIORITY_NORMAL
+ 1);
752 return log_device_debug_errno(spawn
->device
, r
, "Failed to set priority to sigchild event source: %m");
754 return sd_event_loop(e
);
757 int udev_event_spawn(
765 bool *ret_truncated
) {
767 _cleanup_close_pair_
int outpipe
[2] = {-1, -1}, errpipe
[2] = {-1, -1};
768 _cleanup_strv_free_
char **argv
= NULL
;
776 assert(result
|| ressize
== 0);
778 /* pipes from child to parent */
779 if (result
|| log_get_max_level() >= LOG_INFO
)
780 if (pipe2(outpipe
, O_NONBLOCK
|O_CLOEXEC
) != 0)
781 return log_device_error_errno(event
->dev
, errno
,
782 "Failed to create pipe for command '%s': %m", cmd
);
784 if (log_get_max_level() >= LOG_INFO
)
785 if (pipe2(errpipe
, O_NONBLOCK
|O_CLOEXEC
) != 0)
786 return log_device_error_errno(event
->dev
, errno
,
787 "Failed to create pipe for command '%s': %m", cmd
);
789 r
= strv_split_full(&argv
, cmd
, NULL
, EXTRACT_UNQUOTE
| EXTRACT_RELAX
| EXTRACT_RETAIN_ESCAPE
);
791 return log_device_error_errno(event
->dev
, r
, "Failed to split command: %m");
793 if (isempty(argv
[0]))
794 return log_device_error_errno(event
->dev
, SYNTHETIC_ERRNO(EINVAL
),
795 "Invalid command '%s'", cmd
);
797 /* allow programs in /usr/lib/udev/ to be called without the path */
798 if (!path_is_absolute(argv
[0])) {
801 program
= path_join(UDEVLIBEXECDIR
, argv
[0]);
805 free_and_replace(argv
[0], program
);
808 r
= device_get_properties_strv(event
->dev
, &envp
);
810 return log_device_error_errno(event
->dev
, r
, "Failed to get device properties");
812 log_device_debug(event
->dev
, "Starting '%s'", cmd
);
814 r
= safe_fork("(spawn)", FORK_RESET_SIGNALS
|FORK_DEATHSIG
|FORK_LOG
, &pid
);
816 return log_device_error_errno(event
->dev
, r
,
817 "Failed to fork() to execute command '%s': %m", cmd
);
819 if (rearrange_stdio(-1, TAKE_FD(outpipe
[WRITE_END
]), TAKE_FD(errpipe
[WRITE_END
])) < 0)
822 (void) close_all_fds(NULL
, 0);
823 (void) rlimit_nofile_safe();
825 DEVICE_TRACE_POINT(spawn_exec
, event
->dev
, cmd
);
827 execve(argv
[0], argv
, envp
);
831 /* parent closed child's ends of pipes */
832 outpipe
[WRITE_END
] = safe_close(outpipe
[WRITE_END
]);
833 errpipe
[WRITE_END
] = safe_close(errpipe
[WRITE_END
]);
836 .device
= event
->dev
,
839 .accept_failure
= accept_failure
,
840 .timeout_warn_usec
= udev_warn_timeout(timeout_usec
),
841 .timeout_usec
= timeout_usec
,
842 .timeout_signal
= timeout_signal
,
843 .event_birth_usec
= event
->birth_usec
,
844 .fd_stdout
= outpipe
[READ_END
],
845 .fd_stderr
= errpipe
[READ_END
],
847 .result_size
= ressize
,
849 r
= spawn_wait(&spawn
);
851 return log_device_error_errno(event
->dev
, r
,
852 "Failed to wait for spawned command '%s': %m", cmd
);
855 result
[spawn
.result_len
] = '\0';
858 *ret_truncated
= spawn
.truncated
;
860 return r
; /* 0 for success, and positive if the program failed */
863 static int rename_netif(UdevEvent
*event
) {
872 return 0; /* No new name is requested. */
874 dev
= ASSERT_PTR(event
->dev
);
876 /* Read sysname from cloned sd-device object, otherwise use-after-free is triggered, as the
877 * main object will be renamed and dev->sysname will be freed in device_rename(). */
878 r
= sd_device_get_sysname(event
->dev_db_clone
, &oldname
);
880 return log_device_error_errno(dev
, r
, "Failed to get sysname: %m");
882 if (streq(event
->name
, oldname
))
883 return 0; /* The interface name is already requested name. */
885 if (!device_for_action(dev
, SD_DEVICE_ADD
))
886 return 0; /* Rename the interface only when it is added. */
888 r
= sd_device_get_ifindex(dev
, &ifindex
);
890 return 0; /* Device is not a network interface. */
892 return log_device_error_errno(dev
, r
, "Failed to get ifindex: %m");
894 if (naming_scheme_has(NAMING_REPLACE_STRICTLY
) &&
895 !ifname_valid(event
->name
)) {
896 log_device_warning(dev
, "Invalid network interface name, ignoring: %s", event
->name
);
900 r
= rtnl_get_link_info(&event
->rtnl
, ifindex
, NULL
, &flags
, NULL
, NULL
, NULL
);
902 return log_device_warning_errno(dev
, r
, "Failed to get link flags: %m");
904 if (FLAGS_SET(flags
, IFF_UP
)) {
905 log_device_info(dev
, "Network interface '%s' is already up, refusing to rename to '%s'.",
906 oldname
, event
->name
);
910 /* Set ID_RENAMING boolean property here, and drop it in the corresponding move uevent later. */
911 r
= device_add_property(dev
, "ID_RENAMING", "1");
913 return log_device_warning_errno(dev
, r
, "Failed to add 'ID_RENAMING' property: %m");
915 r
= device_rename(dev
, event
->name
);
917 return log_device_warning_errno(dev
, r
, "Failed to update properties with new name '%s': %m", event
->name
);
919 /* Also set ID_RENAMING boolean property to cloned sd_device object and save it to database
920 * before calling rtnl_set_link_name(). Otherwise, clients (e.g., systemd-networkd) may receive
921 * RTM_NEWLINK netlink message before the database is updated. */
922 r
= device_add_property(event
->dev_db_clone
, "ID_RENAMING", "1");
924 return log_device_warning_errno(event
->dev_db_clone
, r
, "Failed to add 'ID_RENAMING' property: %m");
926 r
= device_update_db(event
->dev_db_clone
);
928 return log_device_debug_errno(event
->dev_db_clone
, r
, "Failed to update database under /run/udev/data/: %m");
930 r
= rtnl_set_link_name(&event
->rtnl
, ifindex
, event
->name
);
932 return log_device_error_errno(dev
, r
, "Failed to rename network interface %i from '%s' to '%s': %m",
933 ifindex
, oldname
, event
->name
);
935 log_device_debug(dev
, "Network interface %i is renamed from '%s' to '%s'", ifindex
, oldname
, event
->name
);
940 static int update_devnode(UdevEvent
*event
) {
941 sd_device
*dev
= event
->dev
;
944 r
= sd_device_get_devnum(dev
, NULL
);
948 return log_device_error_errno(dev
, r
, "Failed to get devnum: %m");
950 if (!uid_is_valid(event
->uid
)) {
951 r
= device_get_devnode_uid(dev
, &event
->uid
);
952 if (r
< 0 && r
!= -ENOENT
)
953 return log_device_error_errno(dev
, r
, "Failed to get devnode UID: %m");
956 if (!gid_is_valid(event
->gid
)) {
957 r
= device_get_devnode_gid(dev
, &event
->gid
);
958 if (r
< 0 && r
!= -ENOENT
)
959 return log_device_error_errno(dev
, r
, "Failed to get devnode GID: %m");
962 if (event
->mode
== MODE_INVALID
) {
963 r
= device_get_devnode_mode(dev
, &event
->mode
);
964 if (r
< 0 && r
!= -ENOENT
)
965 return log_device_error_errno(dev
, r
, "Failed to get devnode mode: %m");
968 bool apply_mac
= device_for_action(dev
, SD_DEVICE_ADD
);
970 r
= udev_node_apply_permissions(dev
, apply_mac
, event
->mode
, event
->uid
, event
->gid
, event
->seclabel_list
);
972 return log_device_error_errno(dev
, r
, "Failed to apply devnode permissions: %m");
974 return udev_node_update(dev
, event
->dev_db_clone
);
977 static int event_execute_rules_on_remove(
982 Hashmap
*properties_list
,
985 sd_device
*dev
= event
->dev
;
988 r
= device_read_db_internal(dev
, true);
990 log_device_debug_errno(dev
, r
, "Failed to read database under /run/udev/data/: %m");
992 r
= device_tag_index(dev
, NULL
, false);
994 log_device_debug_errno(dev
, r
, "Failed to remove corresponding tag files under /run/udev/tag/, ignoring: %m");
996 r
= device_delete_db(dev
);
998 log_device_debug_errno(dev
, r
, "Failed to delete database under /run/udev/data/, ignoring: %m");
1000 r
= udev_watch_end(inotify_fd
, dev
);
1002 log_device_warning_errno(dev
, r
, "Failed to remove inotify watch, ignoring: %m");
1004 r
= udev_rules_apply_to_event(rules
, event
, timeout_usec
, timeout_signal
, properties_list
);
1006 if (sd_device_get_devnum(dev
, NULL
) >= 0)
1007 (void) udev_node_remove(dev
);
1012 static int udev_event_on_move(sd_device
*dev
) {
1015 /* Drop previously added property */
1016 r
= device_add_property(dev
, "ID_RENAMING", NULL
);
1018 return log_device_debug_errno(dev
, r
, "Failed to remove 'ID_RENAMING' property: %m");
1023 static int copy_all_tags(sd_device
*d
, sd_device
*s
) {
1032 FOREACH_DEVICE_TAG(s
, tag
) {
1033 r
= device_add_tag(d
, tag
, false);
1041 int udev_event_execute_rules(
1043 int inotify_fd
, /* This may be negative */
1044 usec_t timeout_usec
,
1046 Hashmap
*properties_list
,
1049 sd_device_action_t action
;
1058 r
= sd_device_get_action(dev
, &action
);
1060 return log_device_error_errno(dev
, r
, "Failed to get ACTION: %m");
1062 if (action
== SD_DEVICE_REMOVE
)
1063 return event_execute_rules_on_remove(event
, inotify_fd
, timeout_usec
, timeout_signal
, properties_list
, rules
);
1065 /* Disable watch during event processing. */
1066 r
= udev_watch_end(inotify_fd
, event
->dev
);
1068 log_device_warning_errno(dev
, r
, "Failed to remove inotify watch, ignoring: %m");
1070 r
= device_clone_with_db(dev
, &event
->dev_db_clone
);
1072 return log_device_debug_errno(dev
, r
, "Failed to clone sd_device object: %m");
1074 r
= copy_all_tags(dev
, event
->dev_db_clone
);
1076 log_device_warning_errno(dev
, r
, "Failed to copy all tags from old database entry, ignoring: %m");
1078 if (action
== SD_DEVICE_MOVE
) {
1079 r
= udev_event_on_move(event
->dev
);
1084 DEVICE_TRACE_POINT(rules_start
, dev
);
1086 r
= udev_rules_apply_to_event(rules
, event
, timeout_usec
, timeout_signal
, properties_list
);
1088 return log_device_debug_errno(dev
, r
, "Failed to apply udev rules: %m");
1090 DEVICE_TRACE_POINT(rules_finished
, dev
);
1092 r
= rename_netif(event
);
1096 r
= update_devnode(event
);
1100 /* preserve old, or get new initialization timestamp */
1101 r
= device_ensure_usec_initialized(dev
, event
->dev_db_clone
);
1103 return log_device_debug_errno(dev
, r
, "Failed to set initialization timestamp: %m");
1105 /* (re)write database file */
1106 r
= device_tag_index(dev
, event
->dev_db_clone
, true);
1108 return log_device_debug_errno(dev
, r
, "Failed to update tags under /run/udev/tag/: %m");
1110 r
= device_update_db(dev
);
1112 return log_device_debug_errno(dev
, r
, "Failed to update database under /run/udev/data/: %m");
1114 device_set_is_initialized(dev
);
1119 void udev_event_execute_run(UdevEvent
*event
, usec_t timeout_usec
, int timeout_signal
) {
1120 const char *command
;
1124 ORDERED_HASHMAP_FOREACH_KEY(val
, command
, event
->run_list
) {
1125 UdevBuiltinCommand builtin_cmd
= PTR_TO_UDEV_BUILTIN_CMD(val
);
1127 if (builtin_cmd
!= _UDEV_BUILTIN_INVALID
) {
1128 log_device_debug(event
->dev
, "Running built-in command \"%s\"", command
);
1129 r
= udev_builtin_run(event
->dev
, &event
->rtnl
, builtin_cmd
, command
, false);
1131 log_device_debug_errno(event
->dev
, r
, "Failed to run built-in command \"%s\", ignoring: %m", command
);
1133 if (event
->exec_delay_usec
> 0) {
1134 log_device_debug(event
->dev
, "Delaying execution of \"%s\" for %s.",
1135 command
, FORMAT_TIMESPAN(event
->exec_delay_usec
, USEC_PER_SEC
));
1136 (void) usleep(event
->exec_delay_usec
);
1139 log_device_debug(event
->dev
, "Running command \"%s\"", command
);
1141 r
= udev_event_spawn(event
, timeout_usec
, timeout_signal
, false, command
, NULL
, 0, NULL
);
1143 log_device_warning_errno(event
->dev
, r
, "Failed to execute '%s', ignoring: %m", command
);
1144 else if (r
> 0) /* returned value is positive when program fails */
1145 log_device_debug(event
->dev
, "Command \"%s\" returned %d (error), ignoring.", command
, r
);
1150 void udev_event_process_inotify_watch(UdevEvent
*event
, int inotify_fd
) {
1155 assert(inotify_fd
>= 0);
1157 dev
= ASSERT_PTR(event
->dev
);
1159 if (!event
->inotify_watch
)
1162 if (device_for_action(dev
, SD_DEVICE_REMOVE
))
1165 r
= udev_watch_begin(inotify_fd
, dev
);
1167 log_device_warning_errno(dev
, r
, "Failed to add inotify watch, ignoring: %m");