1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
|
/*
* Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <poll.h>
#include <sys/epoll.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/signalfd.h>
#include <linux/sockios.h>
#include <sys/sysmacros.h>
#include "udev.h"
struct udev_event *udev_event_new(struct udev_device *dev) {
struct udev *udev = udev_device_get_udev(dev);
struct udev_event *event;
event = new0(struct udev_event, 1);
if (event == NULL)
return NULL;
event->dev = dev;
event->udev = udev;
udev_list_init(udev, &event->run_list, false);
udev_list_init(udev, &event->seclabel_list, false);
event->fd_signal = -1;
event->birth_usec = now(CLOCK_MONOTONIC);
return event;
}
void udev_event_unref(struct udev_event *event) {
if (event == NULL)
return;
udev_list_cleanup(&event->run_list);
udev_list_cleanup(&event->seclabel_list);
free(event->program_result);
free(event->name);
free(event);
}
size_t udev_event_apply_format(struct udev_event *event,
const char *src, char *dest, size_t size,
bool replace_whitespace) {
struct udev_device *dev = event->dev;
enum subst_type {
SUBST_UNKNOWN,
SUBST_DEVNODE,
SUBST_ATTR,
SUBST_ENV,
SUBST_KERNEL,
SUBST_KERNEL_NUMBER,
SUBST_DRIVER,
SUBST_DEVPATH,
SUBST_ID,
SUBST_MAJOR,
SUBST_MINOR,
SUBST_RESULT,
SUBST_PARENT,
SUBST_NAME,
SUBST_LINKS,
SUBST_ROOT,
SUBST_SYS,
};
static const struct subst_map {
const char *name;
const char fmt;
enum subst_type type;
} map[] = {
{ .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
{ .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
{ .name = "attr", .fmt = 's', .type = SUBST_ATTR },
{ .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
{ .name = "env", .fmt = 'E', .type = SUBST_ENV },
{ .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
{ .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
{ .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
{ .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
{ .name = "id", .fmt = 'b', .type = SUBST_ID },
{ .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
{ .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
{ .name = "result", .fmt = 'c', .type = SUBST_RESULT },
{ .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
{ .name = "name", .fmt = 'D', .type = SUBST_NAME },
{ .name = "links", .fmt = 'L', .type = SUBST_LINKS },
{ .name = "root", .fmt = 'r', .type = SUBST_ROOT },
{ .name = "sys", .fmt = 'S', .type = SUBST_SYS },
};
const char *from;
char *s;
size_t l;
from = src;
s = dest;
l = size;
for (;;) {
enum subst_type type = SUBST_UNKNOWN;
char attrbuf[UTIL_PATH_SIZE], sbuf[UTIL_PATH_SIZE];
char *attr = NULL, *_s;
size_t _l;
bool replws = replace_whitespace;
while (from[0] != '\0') {
if (from[0] == '$') {
/* substitute named variable */
unsigned int i;
if (from[1] == '$') {
from++;
goto copy;
}
for (i = 0; i < ELEMENTSOF(map); i++) {
if (startswith(&from[1], map[i].name)) {
type = map[i].type;
from += strlen(map[i].name)+1;
goto subst;
}
}
} else if (from[0] == '%') {
/* substitute format char */
unsigned int i;
if (from[1] == '%') {
from++;
goto copy;
}
for (i = 0; i < ELEMENTSOF(map); i++) {
if (from[1] == map[i].fmt) {
type = map[i].type;
from += 2;
goto subst;
}
}
}
copy:
/* copy char */
if (l == 0)
goto out;
s[0] = from[0];
from++;
s++;
l--;
}
goto out;
subst:
/* extract possible $format{attr} */
if (from[0] == '{') {
unsigned int i;
from++;
for (i = 0; from[i] != '}'; i++) {
if (from[i] == '\0') {
log_error("missing closing brace for format '%s'", src);
goto out;
}
}
if (i >= sizeof(attrbuf))
goto out;
memcpy(attrbuf, from, i);
attrbuf[i] = '\0';
from += i+1;
attr = attrbuf;
} else {
attr = NULL;
}
/* result subst handles space as field separator */
if (type == SUBST_RESULT)
replws = false;
if (replws) {
/* store dest string ptr and remaining len */
_s = s;
_l = l;
/* temporarily use sbuf */
s = sbuf;
l = UTIL_PATH_SIZE;
}
switch (type) {
case SUBST_DEVPATH:
l = strpcpy(&s, l, udev_device_get_devpath(dev));
break;
case SUBST_KERNEL:
l = strpcpy(&s, l, udev_device_get_sysname(dev));
break;
case SUBST_KERNEL_NUMBER:
if (udev_device_get_sysnum(dev) == NULL)
break;
l = strpcpy(&s, l, udev_device_get_sysnum(dev));
break;
case SUBST_ID:
if (event->dev_parent == NULL)
break;
l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
break;
case SUBST_DRIVER: {
const char *driver;
if (event->dev_parent == NULL)
break;
driver = udev_device_get_driver(event->dev_parent);
if (driver == NULL)
break;
l = strpcpy(&s, l, driver);
break;
}
case SUBST_MAJOR: {
char num[UTIL_PATH_SIZE];
sprintf(num, "%u", major(udev_device_get_devnum(dev)));
l = strpcpy(&s, l, num);
break;
}
case SUBST_MINOR: {
char num[UTIL_PATH_SIZE];
sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
l = strpcpy(&s, l, num);
break;
}
case SUBST_RESULT: {
char *rest;
int i;
if (event->program_result == NULL)
break;
/* get part part of the result string */
i = 0;
if (attr != NULL)
i = strtoul(attr, &rest, 10);
if (i > 0) {
char result[UTIL_PATH_SIZE];
char tmp[UTIL_PATH_SIZE];
char *cpos;
strscpy(result, sizeof(result), event->program_result);
cpos = result;
while (--i) {
while (cpos[0] != '\0' && !isspace(cpos[0]))
cpos++;
while (isspace(cpos[0]))
cpos++;
if (cpos[0] == '\0')
break;
}
if (i > 0) {
log_error("requested part of result string not found");
break;
}
strscpy(tmp, sizeof(tmp), cpos);
/* %{2+}c copies the whole string from the second part on */
if (rest[0] != '+') {
cpos = strchr(tmp, ' ');
if (cpos)
cpos[0] = '\0';
}
l = strpcpy(&s, l, tmp);
} else {
l = strpcpy(&s, l, event->program_result);
}
break;
}
case SUBST_ATTR: {
const char *value = NULL;
char vbuf[UTIL_NAME_SIZE];
size_t len;
int count;
if (attr == NULL) {
log_error("missing file parameter for attr");
break;
}
/* try to read the value specified by "[dmi/id]product_name" */
if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
value = vbuf;
/* try to read the attribute the device */
if (value == NULL)
value = udev_device_get_sysattr_value(event->dev, attr);
/* try to read the attribute of the parent device, other matches have selected */
if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
value = udev_device_get_sysattr_value(event->dev_parent, attr);
if (value == NULL)
break;
/* strip trailing whitespace, and replace unwanted characters */
if (value != vbuf)
strscpy(vbuf, sizeof(vbuf), value);
len = strlen(vbuf);
while (len > 0 && isspace(vbuf[--len]))
vbuf[len] = '\0';
count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
if (count > 0)
log_debug("%i character(s) replaced" , count);
l = strpcpy(&s, l, vbuf);
break;
}
case SUBST_PARENT: {
struct udev_device *dev_parent;
const char *devnode;
dev_parent = udev_device_get_parent(event->dev);
if (dev_parent == NULL)
break;
devnode = udev_device_get_devnode(dev_parent);
if (devnode != NULL)
l = strpcpy(&s, l, devnode + strlen("/dev/"));
break;
}
case SUBST_DEVNODE:
if (udev_device_get_devnode(dev) != NULL)
l = strpcpy(&s, l, udev_device_get_devnode(dev));
break;
case SUBST_NAME:
if (event->name != NULL)
l = strpcpy(&s, l, event->name);
else if (udev_device_get_devnode(dev) != NULL)
l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/"));
else
l = strpcpy(&s, l, udev_device_get_sysname(dev));
break;
case SUBST_LINKS: {
struct udev_list_entry *list_entry;
list_entry = udev_device_get_devlinks_list_entry(dev);
if (list_entry == NULL)
break;
l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/"));
udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL);
break;
}
case SUBST_ROOT:
l = strpcpy(&s, l, "/dev");
break;
case SUBST_SYS:
l = strpcpy(&s, l, "/sys");
break;
case SUBST_ENV:
if (attr == NULL) {
break;
} else {
const char *value;
value = udev_device_get_property_value(event->dev, attr);
if (value == NULL)
break;
l = strpcpy(&s, l, value);
break;
}
default:
log_error("unknown substitution type=%i", type);
break;
}
/* replace whitespace in sbuf and copy to dest */
if (replws) {
size_t tmplen = UTIL_PATH_SIZE - l;
/* restore s and l to dest string values */
s = _s;
l = _l;
/* copy ws-replaced value to s */
tmplen = util_replace_whitespace(sbuf, s, MIN(tmplen, l));
l -= tmplen;
s += tmplen;
}
}
out:
s[0] = '\0';
return l;
}
static int spawn_exec(struct udev_event *event,
const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
int fd_stdout, int fd_stderr) {
_cleanup_close_ int fd = -1;
/* discard child output or connect to pipe */
fd = open("/dev/null", O_RDWR);
if (fd >= 0) {
dup2(fd, STDIN_FILENO);
if (fd_stdout < 0)
dup2(fd, STDOUT_FILENO);
if (fd_stderr < 0)
dup2(fd, STDERR_FILENO);
} else
log_error_errno(errno, "open /dev/null failed: %m");
/* connect pipes to std{out,err} */
if (fd_stdout >= 0) {
dup2(fd_stdout, STDOUT_FILENO);
safe_close(fd_stdout);
}
if (fd_stderr >= 0) {
dup2(fd_stderr, STDERR_FILENO);
safe_close(fd_stderr);
}
/* terminate child in case parent goes away */
prctl(PR_SET_PDEATHSIG, SIGTERM);
/* restore original udev sigmask before exec */
if (sigmask)
sigprocmask(SIG_SETMASK, sigmask, NULL);
execve(argv[0], argv, envp);
/* exec failed */
log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
return -errno;
}
static void spawn_read(struct udev_event *event,
usec_t timeout_usec,
const char *cmd,
int fd_stdout, int fd_stderr,
char *result, size_t ressize) {
_cleanup_close_ int fd_ep = -1;
struct epoll_event ep_outpipe = {
.events = EPOLLIN,
.data.ptr = &fd_stdout,
};
struct epoll_event ep_errpipe = {
.events = EPOLLIN,
.data.ptr = &fd_stderr,
};
size_t respos = 0;
int r;
/* read from child if requested */
if (fd_stdout < 0 && fd_stderr < 0)
return;
fd_ep = epoll_create1(EPOLL_CLOEXEC);
if (fd_ep < 0) {
log_error_errno(errno, "error creating epoll fd: %m");
return;
}
if (fd_stdout >= 0) {
r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
if (r < 0) {
log_error_errno(errno, "fail to add stdout fd to epoll: %m");
return;
}
}
if (fd_stderr >= 0) {
r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
if (r < 0) {
log_error_errno(errno, "fail to add stderr fd to epoll: %m");
return;
}
}
/* read child output */
while (fd_stdout >= 0 || fd_stderr >= 0) {
int timeout;
int fdcount;
struct epoll_event ev[4];
int i;
if (timeout_usec > 0) {
usec_t age_usec;
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
if (age_usec >= timeout_usec) {
log_error("timeout '%s'", cmd);
return;
}
timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
} else {
timeout = -1;
}
fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
if (fdcount < 0) {
if (errno == EINTR)
continue;
log_error_errno(errno, "failed to poll: %m");
return;
} else if (fdcount == 0) {
log_error("timeout '%s'", cmd);
return;
}
for (i = 0; i < fdcount; i++) {
int *fd = (int *)ev[i].data.ptr;
if (*fd < 0)
continue;
if (ev[i].events & EPOLLIN) {
ssize_t count;
char buf[4096];
count = read(*fd, buf, sizeof(buf)-1);
if (count <= 0)
continue;
buf[count] = '\0';
/* store stdout result */
if (result != NULL && *fd == fd_stdout) {
if (respos + count < ressize) {
memcpy(&result[respos], buf, count);
respos += count;
} else {
log_error("'%s' ressize %zu too short", cmd, ressize);
}
}
/* log debug output only if we watch stderr */
if (fd_stderr >= 0) {
char *pos;
char *line;
pos = buf;
while ((line = strsep(&pos, "\n"))) {
if (pos != NULL || line[0] != '\0')
log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
}
}
} else if (ev[i].events & EPOLLHUP) {
r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
if (r < 0) {
log_error_errno(errno, "failed to remove fd from epoll: %m");
return;
}
*fd = -1;
}
}
}
/* return the child's stdout string */
if (result != NULL)
result[respos] = '\0';
}
static int spawn_wait(struct udev_event *event,
usec_t timeout_usec,
usec_t timeout_warn_usec,
const char *cmd, pid_t pid) {
struct pollfd pfd[1];
int err = 0;
pfd[0].events = POLLIN;
pfd[0].fd = event->fd_signal;
while (pid > 0) {
int timeout;
int timeout_warn = 0;
int fdcount;
if (timeout_usec > 0) {
usec_t age_usec;
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
if (age_usec >= timeout_usec)
timeout = 1000;
else {
if (timeout_warn_usec > 0)
timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
}
} else {
timeout = -1;
}
fdcount = poll(pfd, 1, timeout_warn);
if (fdcount < 0) {
if (errno == EINTR)
continue;
err = -errno;
log_error_errno(errno, "failed to poll: %m");
goto out;
}
if (fdcount == 0) {
log_warning("slow: '%s' ["PID_FMT"]", cmd, pid);
fdcount = poll(pfd, 1, timeout);
if (fdcount < 0) {
if (errno == EINTR)
continue;
err = -errno;
log_error_errno(errno, "failed to poll: %m");
goto out;
}
if (fdcount == 0) {
log_error("timeout: killing '%s' ["PID_FMT"]", cmd, pid);
kill(pid, SIGKILL);
}
}
if (pfd[0].revents & POLLIN) {
struct signalfd_siginfo fdsi;
int status;
ssize_t size;
size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
if (size != sizeof(struct signalfd_siginfo))
continue;
switch (fdsi.ssi_signo) {
case SIGTERM:
event->sigterm = true;
break;
case SIGCHLD:
if (waitpid(pid, &status, WNOHANG) < 0)
break;
if (WIFEXITED(status)) {
log_debug("'%s' ["PID_FMT"] exit with return code %i", cmd, pid, WEXITSTATUS(status));
if (WEXITSTATUS(status) != 0)
err = -1;
} else if (WIFSIGNALED(status)) {
log_error("'%s' ["PID_FMT"] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
err = -1;
} else if (WIFSTOPPED(status)) {
log_error("'%s' ["PID_FMT"] stopped", cmd, pid);
err = -1;
} else if (WIFCONTINUED(status)) {
log_error("'%s' ["PID_FMT"] continued", cmd, pid);
err = -1;
} else {
log_error("'%s' ["PID_FMT"] exit with status 0x%04x", cmd, pid, status);
err = -1;
}
pid = 0;
break;
}
}
}
out:
return err;
}
int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
int i = 0;
char *pos;
if (strchr(cmd, ' ') == NULL) {
argv[i++] = cmd;
goto out;
}
pos = cmd;
while (pos != NULL && pos[0] != '\0') {
if (pos[0] == '\'') {
/* do not separate quotes */
pos++;
argv[i] = strsep(&pos, "\'");
if (pos != NULL)
while (pos[0] == ' ')
pos++;
} else {
argv[i] = strsep(&pos, " ");
if (pos != NULL)
while (pos[0] == ' ')
pos++;
}
i++;
}
out:
argv[i] = NULL;
if (argc)
*argc = i;
return 0;
}
int udev_event_spawn(struct udev_event *event,
usec_t timeout_usec,
usec_t timeout_warn_usec,
const char *cmd, char **envp, const sigset_t *sigmask,
char *result, size_t ressize) {
int outpipe[2] = {-1, -1};
int errpipe[2] = {-1, -1};
pid_t pid;
char arg[UTIL_PATH_SIZE];
char *argv[128];
char program[UTIL_PATH_SIZE];
int err = 0;
strscpy(arg, sizeof(arg), cmd);
udev_build_argv(event->udev, arg, NULL, argv);
/* pipes from child to parent */
if (result != NULL || log_get_max_level() >= LOG_INFO) {
if (pipe2(outpipe, O_NONBLOCK) != 0) {
err = -errno;
log_error_errno(errno, "pipe failed: %m");
goto out;
}
}
if (log_get_max_level() >= LOG_INFO) {
if (pipe2(errpipe, O_NONBLOCK) != 0) {
err = -errno;
log_error_errno(errno, "pipe failed: %m");
goto out;
}
}
/* allow programs in /usr/lib/udev/ to be called without the path */
if (argv[0][0] != '/') {
strscpyl(program, sizeof(program), UDEV_LIBEXEC_DIR "/", argv[0], NULL);
#ifdef HAVE_SPLIT_USR
if(access(program, X_OK))
strscpyl(program, sizeof(program), "/usr/lib/udev/", argv[0], NULL);
if(access(program, X_OK))
strscpyl(program, sizeof(program), "/lib/udev/", argv[0], NULL);
#endif
argv[0] = program;
}
pid = fork();
switch(pid) {
case 0:
/* child closes parent's ends of pipes */
if (outpipe[READ_END] >= 0) {
close(outpipe[READ_END]);
outpipe[READ_END] = -1;
}
if (errpipe[READ_END] >= 0) {
close(errpipe[READ_END]);
errpipe[READ_END] = -1;
}
log_debug("starting '%s'", cmd);
spawn_exec(event, cmd, argv, envp, sigmask,
outpipe[WRITE_END], errpipe[WRITE_END]);
_exit(2 );
case -1:
log_error_errno(errno, "fork of '%s' failed: %m", cmd);
err = -1;
goto out;
default:
/* parent closed child's ends of pipes */
if (outpipe[WRITE_END] >= 0) {
close(outpipe[WRITE_END]);
outpipe[WRITE_END] = -1;
}
if (errpipe[WRITE_END] >= 0) {
close(errpipe[WRITE_END]);
errpipe[WRITE_END] = -1;
}
spawn_read(event,
timeout_usec,
cmd,
outpipe[READ_END], errpipe[READ_END],
result, ressize);
err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
}
out:
if (outpipe[READ_END] >= 0)
close(outpipe[READ_END]);
if (outpipe[WRITE_END] >= 0)
close(outpipe[WRITE_END]);
if (errpipe[READ_END] >= 0)
close(errpipe[READ_END]);
if (errpipe[WRITE_END] >= 0)
close(errpipe[WRITE_END]);
return err;
}
#ifdef ENABLE_RULE_GENERATOR
/* function to return the count of rules that assign NAME= to a value matching arg#2 , defined in udev-rules.c */
int udev_rules_assigning_name_to(struct udev_rules *rules,const char *match_name);
#endif
static int rename_netif_dev_fromname_toname(struct udev_device *dev,const char *oldname,const char *name) {
int r;
int sk;
struct ifreq ifr;
log_debug("changing net interface name from '%s' to '%s'\n",oldname,name);
sk = socket(PF_INET, SOCK_DGRAM, 0);
if (sk < 0)
return log_error_errno(-errno, "error opening socket: %m");
memzero(&ifr, sizeof(struct ifreq));
strscpy(ifr.ifr_name, IFNAMSIZ, oldname);
strscpy(ifr.ifr_newname, IFNAMSIZ, name);
r = ioctl(sk, SIOCSIFNAME, &ifr);
#ifdef ENABLE_RULE_GENERATOR
int loop;
if (r == 0) {
log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname);
goto out;
}
/* keep trying if the destination interface name already exists */
log_debug("collision on rename of network interface %s to %s , retrying until timeout\n",
ifr.ifr_name, ifr.ifr_newname);
r = -errno;
if (r != -EEXIST)
goto out;
/* wait a maximum of 90 seconds for our target to become available */
loop = 90 * 20;
while (loop--) {
const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
nanosleep(&duration, NULL);
r = ioctl(sk, SIOCSIFNAME, &ifr);
if (r == 0) {
log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname);
break;
}
r = -errno;
if (r != -EEXIST)
break;
}
out:
#endif
if (r < 0)
log_error_errno(-errno, "Error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
else
log_debug("renamed network interface '%s' to '%s'", oldname, name);
close(sk);
return r;
}
static int rename_netif(struct udev_event *event) {
return rename_netif_dev_fromname_toname(event->dev,udev_device_get_sysname(event->dev),event->name);
}
void udev_event_execute_rules(struct udev_event *event,
usec_t timeout_usec, usec_t timeout_warn_usec,
struct udev_list *properties_list,
struct udev_rules *rules,
const sigset_t *sigmask) {
struct udev_device *dev = event->dev;
if (udev_device_get_subsystem(dev) == NULL)
return;
if (streq(udev_device_get_action(dev), "remove")) {
udev_device_read_db(dev);
udev_device_tag_index(dev, NULL, false);
udev_device_delete_db(dev);
if (major(udev_device_get_devnum(dev)) != 0)
udev_watch_end(event->udev, dev);
udev_rules_apply_to_event(rules, event,
timeout_usec, timeout_warn_usec,
properties_list,
sigmask);
if (major(udev_device_get_devnum(dev)) != 0)
udev_node_remove(dev);
} else {
event->dev_db = udev_device_clone_with_db(dev);
if (event->dev_db != NULL) {
/* disable watch during event processing */
if (major(udev_device_get_devnum(dev)) != 0)
udev_watch_end(event->udev, event->dev_db);
}
if (major(udev_device_get_devnum(dev)) == 0 &&
streq(udev_device_get_action(dev), "move"))
udev_device_copy_properties(dev, event->dev_db);
udev_rules_apply_to_event(rules, event,
timeout_usec, timeout_warn_usec,
properties_list,
sigmask);
/* rename a new network interface, if needed */
/* ENABLE_RULE_GENERATOR conditional:
* if this is a net iface, and it is an add event,
* and as long as all of the following are FALSE:
* - no NAME target and the current name is not being used
* - there is a NAME target and it is the same as the current name
* - the rules can successfully be searched for the current name (not really part of the conditional)
* the run the rename.
*
* note - udev_rules_assigning_name_to is run when event->name is NULL to ensure renames happen,
* but also on its own to check if a temp-rename is necessary when event->name exists.
*
* A temp-rename is necessary when:
* - there is no rule renaming the current iface but the current name IS used in some other rule
* - there is a rule renaming the current iface,
* the current name IS used AND the target name != the current name
*/
#ifdef ENABLE_RULE_GENERATOR
int r;
if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
(event->name == NULL && (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0 ||
event->name != NULL && !streq(event->name, udev_device_get_sysname(dev)))) {
char syspath[UTIL_PATH_SIZE];
char *pos;
char *finalifname = event->name;
char newifname[IFNAMSIZ];
/* r is the number of rules that assign a device with NAME= this sysname */
if (r > 0 || (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0) {
/* have a conflict, rename to a temp name */
char *newpos;
int ifidnum;
/* build the temporary iface name */
strscpy(newifname, IFNAMSIZ, udev_device_get_sysname(dev));
newpos=pos=&newifname[strcspn(newifname,"0123456789")];
ifidnum=(int)strtol(pos,&newpos,10);
*pos='\0';
if (newpos > pos && *newpos == '\0') /* append new iface num to name */
/* use udev_device_get_ifindex(dev) as it is unique to every iface */
snprintf(pos,IFNAMSIZ+(newifname-pos), "%d", 128 - udev_device_get_ifindex(dev));
/* note, r > 0, which will skip the post-rename stuff if no rename occurs */
/* if sysname isn't already the tmpname (ie there is no numeric component), do the rename */
if (!streq(newifname,udev_device_get_sysname(dev))) {
r = rename_netif_dev_fromname_toname(dev,udev_device_get_sysname(dev),newifname);
if (r == 0) {
finalifname = newifname;
log_debug("renamed netif to '%s' for collision avoidance\n", newifname);
} else {
log_error("could not rename netif to '%s' for collision avoidance\n",newifname);
}
}
/* rename it now to its final target if its not already there */
if (event->name != NULL && !streq(event->name, newifname)) {
r = rename_netif_dev_fromname_toname(dev,newifname,event->name);
if (r == 0)
finalifname = event->name;
}
} else { /* no need to rename to a tempname first, do a regular direct rename to event->name */
r = 1; /* skip the post-rename stuff if no rename occurs */
if (!streq(event->name, udev_device_get_sysname(dev)))
r = rename_netif(event);
}
if (r == 0) {
log_debug("renamed netif to '%s'\n", finalifname);
r = udev_device_rename(dev, finalifname);
#else
if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
int r;
r = rename_netif(event);
if (r < 0)
log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
udev_device_get_sysname(dev), event->name);
else {
r = udev_device_rename(dev, event->name);
#endif
if (r < 0)
log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
else
log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
}
}
if (major(udev_device_get_devnum(dev)) > 0) {
bool apply;
/* remove/update possible left-over symlinks from old database entry */
if (event->dev_db != NULL)
udev_node_update_old_links(dev, event->dev_db);
if (!event->owner_set)
event->uid = udev_device_get_devnode_uid(dev);
if (!event->group_set)
event->gid = udev_device_get_devnode_gid(dev);
if (!event->mode_set) {
if (udev_device_get_devnode_mode(dev) > 0) {
/* kernel supplied value */
event->mode = udev_device_get_devnode_mode(dev);
} else if (event->gid > 0) {
/* default 0660 if a group is assigned */
event->mode = 0660;
} else {
/* default 0600 */
event->mode = 0600;
}
}
apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
}
/* preserve old, or get new initialization timestamp */
udev_device_ensure_usec_initialized(event->dev, event->dev_db);
/* (re)write database file */
udev_device_tag_index(dev, event->dev_db, true);
udev_device_update_db(dev);
udev_device_set_is_initialized(dev);
event->dev_db = udev_device_unref(event->dev_db);
}
}
void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) {
struct udev_list_entry *list_entry;
udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
const char *cmd = udev_list_entry_get_name(list_entry);
enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
if (builtin_cmd < UDEV_BUILTIN_MAX) {
char command[UTIL_PATH_SIZE];
udev_event_apply_format(event, cmd, command, sizeof(command), false);
udev_builtin_run(event->dev, builtin_cmd, command, false);
} else {
char program[UTIL_PATH_SIZE];
char **envp;
if (event->exec_delay > 0) {
log_debug("delay execution of '%s'", program);
sleep(event->exec_delay);
}
udev_event_apply_format(event, cmd, program, sizeof(program), false);
envp = udev_device_get_properties_envp(event->dev);
udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
}
}
}
|