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
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
|
/*-
* Copyright (c) 2002-2010 M. Warner Losh.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* my_system is a variation on lib/libc/stdlib/system.c:
*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* DEVD control daemon.
*/
// TODO list:
// o devd.conf and devd man pages need a lot of help:
// - devd needs to document the unix domain socket
// - devd.conf needs more details on the supported statements.
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <cctype>
#include <cerrno>
#include <cstdlib>
#include <cstdio>
#include <csignal>
#include <cstring>
#include <cstdarg>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <libutil.h>
#include <paths.h>
#include <poll.h>
#include <regex.h>
#include <syslog.h>
#include <unistd.h>
#include <algorithm>
#include <map>
#include <string>
#include <list>
#include <vector>
#include "devd.h" /* C compatible definitions */
#include "devd.hh" /* C++ class definitions */
#define PIPE "/var/run/devd.pipe"
#define CF "/etc/devd.conf"
#define SYSCTL "hw.bus.devctl_disable"
/*
* Since the client socket is nonblocking, we must increase its send buffer to
* handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive
* buffer, so the client can't increate the buffersize by itself.
*
* For example, when creating a ZFS pool, devd emits one 165 character
* resource.fs.zfs.statechange message for each vdev in the pool. A 64k
* buffer has enough space for almost 400 drives, which would be very large but
* not impossibly large pool. A 128k buffer has enough space for 794 drives,
* which is more than can fit in a rack with modern technology.
*/
#define CLIENT_BUFSIZE 131072
using namespace std;
extern FILE *yyin;
extern int lineno;
static const char notify = '!';
static const char nomatch = '?';
static const char attach = '+';
static const char detach = '-';
static struct pidfh *pfh;
int dflag;
int nflag;
static unsigned total_events = 0;
static volatile sig_atomic_t got_siginfo = 0;
static volatile sig_atomic_t romeo_must_die = 0;
static const char *configfile = CF;
static void devdlog(int priority, const char* message, ...)
__printflike(2, 3);
static void event_loop(void);
static void usage(void);
template <class T> void
delete_and_clear(vector<T *> &v)
{
typename vector<T *>::const_iterator i;
for (i = v.begin(); i != v.end(); ++i)
delete *i;
v.clear();
}
config cfg;
event_proc::event_proc() : _prio(-1)
{
_epsvec.reserve(4);
}
event_proc::~event_proc()
{
delete_and_clear(_epsvec);
}
void
event_proc::add(eps *eps)
{
_epsvec.push_back(eps);
}
bool
event_proc::matches(config &c) const
{
vector<eps *>::const_iterator i;
for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
if (!(*i)->do_match(c))
return (false);
return (true);
}
bool
event_proc::run(config &c) const
{
vector<eps *>::const_iterator i;
for (i = _epsvec.begin(); i != _epsvec.end(); ++i)
if (!(*i)->do_action(c))
return (false);
return (true);
}
action::action(const char *cmd)
: _cmd(cmd)
{
// nothing
}
action::~action()
{
// nothing
}
static int
my_system(const char *command)
{
pid_t pid, savedpid;
int pstat;
struct sigaction ign, intact, quitact;
sigset_t newsigblock, oldsigblock;
if (!command) /* just checking... */
return (1);
/*
* Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
* existing signal dispositions.
*/
ign.sa_handler = SIG_IGN;
::sigemptyset(&ign.sa_mask);
ign.sa_flags = 0;
::sigaction(SIGINT, &ign, &intact);
::sigaction(SIGQUIT, &ign, &quitact);
::sigemptyset(&newsigblock);
::sigaddset(&newsigblock, SIGCHLD);
::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
switch (pid = ::fork()) {
case -1: /* error */
break;
case 0: /* child */
/*
* Restore original signal dispositions and exec the command.
*/
::sigaction(SIGINT, &intact, NULL);
::sigaction(SIGQUIT, &quitact, NULL);
::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
/*
* Close the PID file, and all other open descriptors.
* Inherit std{in,out,err} only.
*/
cfg.close_pidfile();
::closefrom(3);
::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
::_exit(127);
default: /* parent */
savedpid = pid;
do {
pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0);
} while (pid == -1 && errno == EINTR);
break;
}
::sigaction(SIGINT, &intact, NULL);
::sigaction(SIGQUIT, &quitact, NULL);
::sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
return (pid == -1 ? -1 : pstat);
}
bool
action::do_action(config &c)
{
string s = c.expand_string(_cmd.c_str());
devdlog(LOG_INFO, "Executing '%s'\n", s.c_str());
my_system(s.c_str());
return (true);
}
match::match(config &c, const char *var, const char *re) :
_inv(re[0] == '!'),
_var(var),
_re(c.expand_string(_inv ? re + 1 : re, "^", "$"))
{
regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
}
match::~match()
{
regfree(&_regex);
}
bool
match::do_match(config &c)
{
const string &value = c.get_variable(_var);
bool retval;
/*
* This function gets called WAY too often to justify calling syslog()
* each time, even at LOG_DEBUG. Because if syslogd isn't running, it
* can consume excessive amounts of systime inside of connect(). Only
* log when we're in -d mode.
*/
if (dflag) {
devdlog(LOG_DEBUG, "Testing %s=%s against %s, invert=%d\n",
_var.c_str(), value.c_str(), _re.c_str(), _inv);
}
retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
if (_inv == 1)
retval = (retval == 0) ? 1 : 0;
return (retval);
}
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_media.h>
media::media(config &, const char *var, const char *type)
: _var(var), _type(-1)
{
static struct ifmedia_description media_types[] = {
{ IFM_ETHER, "Ethernet" },
{ IFM_TOKEN, "Tokenring" },
{ IFM_FDDI, "FDDI" },
{ IFM_IEEE80211, "802.11" },
{ IFM_ATM, "ATM" },
{ -1, "unknown" },
{ 0, NULL },
};
for (int i = 0; media_types[i].ifmt_string != NULL; ++i)
if (strcasecmp(type, media_types[i].ifmt_string) == 0) {
_type = media_types[i].ifmt_word;
break;
}
}
media::~media()
{
}
bool
media::do_match(config &c)
{
string value;
struct ifmediareq ifmr;
bool retval;
int s;
// Since we can be called from both a device attach/detach
// context where device-name is defined and what we want,
// as well as from a link status context, where subsystem is
// the name of interest, first try device-name and fall back
// to subsystem if none exists.
value = c.get_variable("device-name");
if (value.empty())
value = c.get_variable("subsystem");
devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n",
value.c_str(), _type);
retval = false;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s >= 0) {
memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name));
if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 &&
ifmr.ifm_status & IFM_AVALID) {
devdlog(LOG_DEBUG, "%s has media type 0x%x\n",
value.c_str(), IFM_TYPE(ifmr.ifm_active));
retval = (IFM_TYPE(ifmr.ifm_active) == _type);
} else if (_type == -1) {
devdlog(LOG_DEBUG, "%s has unknown media type\n",
value.c_str());
retval = true;
}
close(s);
}
return (retval);
}
const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
const string var_list::nothing = "";
const string &
var_list::get_variable(const string &var) const
{
map<string, string>::const_iterator i;
i = _vars.find(var);
if (i == _vars.end())
return (var_list::bogus);
return (i->second);
}
bool
var_list::is_set(const string &var) const
{
return (_vars.find(var) != _vars.end());
}
void
var_list::set_variable(const string &var, const string &val)
{
/*
* This function gets called WAY too often to justify calling syslog()
* each time, even at LOG_DEBUG. Because if syslogd isn't running, it
* can consume excessive amounts of systime inside of connect(). Only
* log when we're in -d mode.
*/
if (dflag)
devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str());
_vars[var] = val;
}
void
config::reset(void)
{
_dir_list.clear();
delete_and_clear(_var_list_table);
delete_and_clear(_attach_list);
delete_and_clear(_detach_list);
delete_and_clear(_nomatch_list);
delete_and_clear(_notify_list);
}
void
config::parse_one_file(const char *fn)
{
devdlog(LOG_DEBUG, "Parsing %s\n", fn);
yyin = fopen(fn, "r");
if (yyin == NULL)
err(1, "Cannot open config file %s", fn);
lineno = 1;
if (yyparse() != 0)
errx(1, "Cannot parse %s at line %d", fn, lineno);
fclose(yyin);
}
void
config::parse_files_in_dir(const char *dirname)
{
DIR *dirp;
struct dirent *dp;
char path[PATH_MAX];
devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname);
dirp = opendir(dirname);
if (dirp == NULL)
return;
readdir(dirp); /* Skip . */
readdir(dirp); /* Skip .. */
while ((dp = readdir(dirp)) != NULL) {
if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
snprintf(path, sizeof(path), "%s/%s",
dirname, dp->d_name);
parse_one_file(path);
}
}
closedir(dirp);
}
class epv_greater {
public:
int operator()(event_proc *const&l1, event_proc *const&l2) const
{
return (l1->get_priority() > l2->get_priority());
}
};
void
config::sort_vector(vector<event_proc *> &v)
{
stable_sort(v.begin(), v.end(), epv_greater());
}
void
config::parse(void)
{
vector<string>::const_iterator i;
parse_one_file(configfile);
for (i = _dir_list.begin(); i != _dir_list.end(); ++i)
parse_files_in_dir((*i).c_str());
sort_vector(_attach_list);
sort_vector(_detach_list);
sort_vector(_nomatch_list);
sort_vector(_notify_list);
}
void
config::open_pidfile()
{
pid_t otherpid;
if (_pidfile.empty())
return;
pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid);
if (pfh == NULL) {
if (errno == EEXIST)
errx(1, "devd already running, pid: %d", (int)otherpid);
warn("cannot open pid file");
}
}
void
config::write_pidfile()
{
pidfile_write(pfh);
}
void
config::close_pidfile()
{
pidfile_close(pfh);
}
void
config::remove_pidfile()
{
pidfile_remove(pfh);
}
void
config::add_attach(int prio, event_proc *p)
{
p->set_priority(prio);
_attach_list.push_back(p);
}
void
config::add_detach(int prio, event_proc *p)
{
p->set_priority(prio);
_detach_list.push_back(p);
}
void
config::add_directory(const char *dir)
{
_dir_list.push_back(string(dir));
}
void
config::add_nomatch(int prio, event_proc *p)
{
p->set_priority(prio);
_nomatch_list.push_back(p);
}
void
config::add_notify(int prio, event_proc *p)
{
p->set_priority(prio);
_notify_list.push_back(p);
}
void
config::set_pidfile(const char *fn)
{
_pidfile = fn;
}
void
config::push_var_table()
{
var_list *vl;
vl = new var_list();
_var_list_table.push_back(vl);
devdlog(LOG_DEBUG, "Pushing table\n");
}
void
config::pop_var_table()
{
delete _var_list_table.back();
_var_list_table.pop_back();
devdlog(LOG_DEBUG, "Popping table\n");
}
void
config::set_variable(const char *var, const char *val)
{
_var_list_table.back()->set_variable(var, val);
}
const string &
config::get_variable(const string &var)
{
vector<var_list *>::reverse_iterator i;
for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) {
if ((*i)->is_set(var))
return ((*i)->get_variable(var));
}
return (var_list::nothing);
}
bool
config::is_id_char(char ch) const
{
return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
ch == '-'));
}
void
config::expand_one(const char *&src, string &dst)
{
int count;
string buffer;
src++;
// $$ -> $
if (*src == '$') {
dst += *src++;
return;
}
// $(foo) -> $(foo)
// Not sure if I want to support this or not, so for now we just pass
// it through.
if (*src == '(') {
dst += '$';
count = 1;
/* If the string ends before ) is matched , return. */
while (count > 0 && *src) {
if (*src == ')')
count--;
else if (*src == '(')
count++;
dst += *src++;
}
return;
}
// $[^A-Za-z] -> $\1
if (!isalpha(*src)) {
dst += '$';
dst += *src++;
return;
}
// $var -> replace with value
do {
buffer += *src++;
} while (is_id_char(*src));
dst.append(get_variable(buffer));
}
const string
config::expand_string(const char *src, const char *prepend, const char *append)
{
const char *var_at;
string dst;
/*
* 128 bytes is enough for 2427 of 2438 expansions that happen
* while parsing config files, as tested on 2013-01-30.
*/
dst.reserve(128);
if (prepend != NULL)
dst = prepend;
for (;;) {
var_at = strchr(src, '$');
if (var_at == NULL) {
dst.append(src);
break;
}
dst.append(src, var_at - src);
src = var_at;
expand_one(src, dst);
}
if (append != NULL)
dst.append(append);
return (dst);
}
bool
config::chop_var(char *&buffer, char *&lhs, char *&rhs) const
{
char *walker;
if (*buffer == '\0')
return (false);
walker = lhs = buffer;
while (is_id_char(*walker))
walker++;
if (*walker != '=')
return (false);
walker++; // skip =
if (*walker == '"') {
walker++; // skip "
rhs = walker;
while (*walker && *walker != '"')
walker++;
if (*walker != '"')
return (false);
rhs[-2] = '\0';
*walker++ = '\0';
} else {
rhs = walker;
while (*walker && !isspace(*walker))
walker++;
if (*walker != '\0')
*walker++ = '\0';
rhs[-1] = '\0';
}
while (isspace(*walker))
walker++;
buffer = walker;
return (true);
}
char *
config::set_vars(char *buffer)
{
char *lhs;
char *rhs;
while (1) {
if (!chop_var(buffer, lhs, rhs))
break;
set_variable(lhs, rhs);
}
return (buffer);
}
void
config::find_and_execute(char type)
{
vector<event_proc *> *l;
vector<event_proc *>::const_iterator i;
const char *s;
switch (type) {
default:
return;
case notify:
l = &_notify_list;
s = "notify";
break;
case nomatch:
l = &_nomatch_list;
s = "nomatch";
break;
case attach:
l = &_attach_list;
s = "attach";
break;
case detach:
l = &_detach_list;
s = "detach";
break;
}
devdlog(LOG_DEBUG, "Processing %s event\n", s);
for (i = l->begin(); i != l->end(); ++i) {
if ((*i)->matches(*this)) {
(*i)->run(*this);
break;
}
}
}
static void
process_event(char *buffer)
{
char type;
char *sp;
sp = buffer + 1;
devdlog(LOG_INFO, "Processing event '%s'\n", buffer);
type = *buffer++;
cfg.push_var_table();
// No match doesn't have a device, and the format is a little
// different, so handle it separately.
switch (type) {
case notify:
sp = cfg.set_vars(sp);
break;
case nomatch:
//? at location pnp-info on bus
sp = strchr(sp, ' ');
if (sp == NULL)
return; /* Can't happen? */
*sp++ = '\0';
while (isspace(*sp))
sp++;
if (strncmp(sp, "at ", 3) == 0)
sp += 3;
sp = cfg.set_vars(sp);
while (isspace(*sp))
sp++;
if (strncmp(sp, "on ", 3) == 0)
cfg.set_variable("bus", sp + 3);
break;
case attach: /*FALLTHROUGH*/
case detach:
sp = strchr(sp, ' ');
if (sp == NULL)
return; /* Can't happen? */
*sp++ = '\0';
cfg.set_variable("device-name", buffer);
while (isspace(*sp))
sp++;
if (strncmp(sp, "at ", 3) == 0)
sp += 3;
sp = cfg.set_vars(sp);
while (isspace(*sp))
sp++;
if (strncmp(sp, "on ", 3) == 0)
cfg.set_variable("bus", sp + 3);
break;
}
cfg.find_and_execute(type);
cfg.pop_var_table();
}
int
create_socket(const char *name)
{
int fd, slen;
struct sockaddr_un sun;
if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
err(1, "socket");
bzero(&sun, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, name, sizeof(sun.sun_path));
slen = SUN_LEN(&sun);
unlink(name);
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
err(1, "fcntl");
if (::bind(fd, (struct sockaddr *) & sun, slen) < 0)
err(1, "bind");
listen(fd, 4);
chown(name, 0, 0); /* XXX - root.wheel */
chmod(name, 0666);
return (fd);
}
unsigned int max_clients = 10; /* Default, can be overriden on cmdline. */
unsigned int num_clients;
list<int> clients;
void
notify_clients(const char *data, int len)
{
list<int>::iterator i;
/*
* Deliver the data to all clients. Throw clients overboard at the
* first sign of trouble. This reaps clients who've died or closed
* their sockets, and also clients who are alive but failing to keep up
* (or who are maliciously not reading, to consume buffer space in
* kernel memory or tie up the limited number of available connections).
*/
for (i = clients.begin(); i != clients.end(); ) {
if (write(*i, data, len) != len) {
--num_clients;
close(*i);
i = clients.erase(i);
devdlog(LOG_WARNING, "notify_clients: write() failed; "
"dropping unresponsive client\n");
} else
++i;
}
}
void
check_clients(void)
{
int s;
struct pollfd pfd;
list<int>::iterator i;
/*
* Check all existing clients to see if any of them have disappeared.
* Normally we reap clients when we get an error trying to send them an
* event. This check eliminates the problem of an ever-growing list of
* zombie clients because we're never writing to them on a system
* without frequent device-change activity.
*/
pfd.events = 0;
for (i = clients.begin(); i != clients.end(); ) {
pfd.fd = *i;
s = poll(&pfd, 1, 0);
if ((s < 0 && s != EINTR ) ||
(s > 0 && (pfd.revents & POLLHUP))) {
--num_clients;
close(*i);
i = clients.erase(i);
devdlog(LOG_NOTICE, "check_clients: "
"dropping disconnected client\n");
} else
++i;
}
}
void
new_client(int fd)
{
int s;
int sndbuf_size;
/*
* First go reap any zombie clients, then accept the connection, and
* shut down the read side to stop clients from consuming kernel memory
* by sending large buffers full of data we'll never read.
*/
check_clients();
s = accept(fd, NULL, NULL);
if (s != -1) {
sndbuf_size = CLIENT_BUFSIZE;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &sndbuf_size,
sizeof(sndbuf_size)))
err(1, "setsockopt");
shutdown(s, SHUT_RD);
clients.push_back(s);
++num_clients;
} else
err(1, "accept");
}
static void
event_loop(void)
{
int rv;
int fd;
char buffer[DEVCTL_MAXBUF];
int once = 0;
int server_fd, max_fd;
int accepting;
timeval tv;
fd_set fds;
fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC);
if (fd == -1)
err(1, "Can't open devctl device %s", PATH_DEVCTL);
server_fd = create_socket(PIPE);
accepting = 1;
max_fd = max(fd, server_fd) + 1;
while (!romeo_must_die) {
if (!once && !dflag && !nflag) {
// Check to see if we have any events pending.
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&fds);
FD_SET(fd, &fds);
rv = select(fd + 1, &fds, &fds, &fds, &tv);
// No events -> we've processed all pending events
if (rv == 0) {
devdlog(LOG_DEBUG, "Calling daemon\n");
cfg.remove_pidfile();
cfg.open_pidfile();
daemon(0, 0);
cfg.write_pidfile();
once++;
}
}
/*
* When we've already got the max number of clients, stop
* accepting new connections (don't put server_fd in the set),
* shrink the accept() queue to reject connections quickly, and
* poll the existing clients more often, so that we notice more
* quickly when any of them disappear to free up client slots.
*/
FD_ZERO(&fds);
FD_SET(fd, &fds);
if (num_clients < max_clients) {
if (!accepting) {
listen(server_fd, max_clients);
accepting = 1;
}
FD_SET(server_fd, &fds);
tv.tv_sec = 60;
tv.tv_usec = 0;
} else {
if (accepting) {
listen(server_fd, 0);
accepting = 0;
}
tv.tv_sec = 2;
tv.tv_usec = 0;
}
rv = select(max_fd, &fds, NULL, NULL, &tv);
if (got_siginfo) {
devdlog(LOG_NOTICE, "Events received so far=%u\n",
total_events);
got_siginfo = 0;
}
if (rv == -1) {
if (errno == EINTR)
continue;
err(1, "select");
} else if (rv == 0)
check_clients();
if (FD_ISSET(fd, &fds)) {
rv = read(fd, buffer, sizeof(buffer) - 1);
if (rv > 0) {
total_events++;
if (rv == sizeof(buffer) - 1) {
devdlog(LOG_WARNING, "Warning: "
"available event data exceeded "
"buffer space\n");
}
notify_clients(buffer, rv);
buffer[rv] = '\0';
while (buffer[--rv] == '\n')
buffer[rv] = '\0';
process_event(buffer);
} else if (rv < 0) {
if (errno != EINTR)
break;
} else {
/* EOF */
break;
}
}
if (FD_ISSET(server_fd, &fds))
new_client(server_fd);
}
close(fd);
}
/*
* functions that the parser uses.
*/
void
add_attach(int prio, event_proc *p)
{
cfg.add_attach(prio, p);
}
void
add_detach(int prio, event_proc *p)
{
cfg.add_detach(prio, p);
}
void
add_directory(const char *dir)
{
cfg.add_directory(dir);
free(const_cast<char *>(dir));
}
void
add_nomatch(int prio, event_proc *p)
{
cfg.add_nomatch(prio, p);
}
void
add_notify(int prio, event_proc *p)
{
cfg.add_notify(prio, p);
}
event_proc *
add_to_event_proc(event_proc *ep, eps *eps)
{
if (ep == NULL)
ep = new event_proc();
ep->add(eps);
return (ep);
}
eps *
new_action(const char *cmd)
{
eps *e = new action(cmd);
free(const_cast<char *>(cmd));
return (e);
}
eps *
new_match(const char *var, const char *re)
{
eps *e = new match(cfg, var, re);
free(const_cast<char *>(var));
free(const_cast<char *>(re));
return (e);
}
eps *
new_media(const char *var, const char *re)
{
eps *e = new media(cfg, var, re);
free(const_cast<char *>(var));
free(const_cast<char *>(re));
return (e);
}
void
set_pidfile(const char *name)
{
cfg.set_pidfile(name);
free(const_cast<char *>(name));
}
void
set_variable(const char *var, const char *val)
{
cfg.set_variable(var, val);
free(const_cast<char *>(var));
free(const_cast<char *>(val));
}
static void
gensighand(int)
{
romeo_must_die = 1;
}
/*
* SIGINFO handler. Will print useful statistics to the syslog or stderr
* as appropriate
*/
static void
siginfohand(int)
{
got_siginfo = 1;
}
/*
* Local logging function. Prints to syslog if we're daemonized; stderr
* otherwise.
*/
static void
devdlog(int priority, const char* fmt, ...)
{
va_list argp;
va_start(argp, fmt);
if (dflag)
vfprintf(stderr, fmt, argp);
else
vsyslog(priority, fmt, argp);
va_end(argp);
}
static void
usage()
{
fprintf(stderr, "usage: %s [-dn] [-l connlimit] [-f file]\n",
getprogname());
exit(1);
}
static void
check_devd_enabled()
{
int val = 0;
size_t len;
len = sizeof(val);
if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0)
errx(1, "devctl sysctl missing from kernel!");
if (val) {
warnx("Setting " SYSCTL " to 0");
val = 0;
sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val));
}
}
/*
* main
*/
int
main(int argc, char **argv)
{
int ch;
check_devd_enabled();
while ((ch = getopt(argc, argv, "df:l:n")) != -1) {
switch (ch) {
case 'd':
dflag++;
break;
case 'f':
configfile = optarg;
break;
case 'l':
max_clients = MAX(1, strtoul(optarg, NULL, 0));
break;
case 'n':
nflag++;
break;
default:
usage();
}
}
cfg.parse();
if (!dflag && nflag) {
cfg.open_pidfile();
daemon(0, 0);
cfg.write_pidfile();
}
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, gensighand);
signal(SIGINT, gensighand);
signal(SIGTERM, gensighand);
signal(SIGINFO, siginfohand);
event_loop();
return (0);
}
|