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
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* The purpose of this file is to store the code that MOST mpm's will need
* this does not mean a function only goes into this file if every MPM needs
* it. It means that if a function is needed by more than one MPM, and
* future maintenance would be served by making the code common, then the
* function belongs here.
*
* This is going in src/main because it is not platform specific, it is
* specific to multi-process servers, but NOT to Unix. Which is why it
* does not belong in src/os/unix
*/
#include "apr.h"
#include "apr_thread_proc.h"
#include "apr_signal.h"
#include "apr_strings.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "apr_getopt.h"
#include "apr_optional.h"
#include "apr_allocator.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "http_main.h"
#include "mpm.h"
#include "mpm_common.h"
#include "ap_mpm.h"
#include "ap_listen.h"
#include "mpm_default.h"
#include "util_mutex.h"
#ifdef AP_MPM_WANT_SET_SCOREBOARD
#include "scoreboard.h"
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if AP_ENABLE_EXCEPTION_HOOK
APR_HOOK_STRUCT(
APR_HOOK_LINK(fatal_exception)
APR_HOOK_LINK(monitor)
APR_HOOK_LINK(drop_privileges)
)
AP_IMPLEMENT_HOOK_RUN_ALL(int, fatal_exception,
(ap_exception_info_t *ei), (ei), OK, DECLINED)
#else
APR_HOOK_STRUCT(
APR_HOOK_LINK(monitor)
APR_HOOK_LINK(drop_privileges)
)
#endif
AP_IMPLEMENT_HOOK_RUN_ALL(int, monitor,
(apr_pool_t *p), (p), OK, DECLINED)
AP_IMPLEMENT_HOOK_RUN_ALL(int, drop_privileges,
(apr_pool_t * pchild, server_rec * s),
(pchild, s), OK, DECLINED)
#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
typedef enum {DO_NOTHING, SEND_SIGTERM, SEND_SIGKILL, GIVEUP} action_t;
typedef struct extra_process_t {
struct extra_process_t *next;
pid_t pid;
} extra_process_t;
static extra_process_t *extras;
void ap_register_extra_mpm_process(pid_t pid)
{
extra_process_t *p = (extra_process_t *)malloc(sizeof(extra_process_t));
p->next = extras;
p->pid = pid;
extras = p;
}
int ap_unregister_extra_mpm_process(pid_t pid)
{
extra_process_t *cur = extras;
extra_process_t *prev = NULL;
while (cur && cur->pid != pid) {
prev = cur;
cur = cur->next;
}
if (cur) {
if (prev) {
prev->next = cur->next;
}
else {
extras = cur->next;
}
free(cur);
return 1; /* found */
}
else {
/* we don't know about any such process */
return 0;
}
}
static int reclaim_one_pid(pid_t pid, action_t action)
{
apr_proc_t proc;
apr_status_t waitret;
apr_exit_why_e why;
int status;
/* Ensure pid sanity. */
if (pid < 1) {
return 1;
}
proc.pid = pid;
waitret = apr_proc_wait(&proc, &status, &why, APR_NOWAIT);
if (waitret != APR_CHILD_NOTDONE) {
#ifdef AP_MPM_WANT_PROCESS_CHILD_STATUS
if (waitret == APR_CHILD_DONE)
ap_process_child_status(&proc, why, status);
#endif
return 1;
}
switch(action) {
case DO_NOTHING:
break;
case SEND_SIGTERM:
/* ok, now it's being annoying */
ap_log_error(APLOG_MARK, APLOG_WARNING,
0, ap_server_conf,
"child process %" APR_PID_T_FMT
" still did not exit, "
"sending a SIGTERM",
pid);
kill(pid, SIGTERM);
break;
case SEND_SIGKILL:
ap_log_error(APLOG_MARK, APLOG_ERR,
0, ap_server_conf,
"child process %" APR_PID_T_FMT
" still did not exit, "
"sending a SIGKILL",
pid);
#ifndef BEOS
kill(pid, SIGKILL);
#else
/* sending a SIGKILL kills the entire team on BeOS, and as
* httpd thread is part of that team it removes any chance
* of ever doing a restart. To counter this I'm changing to
* use a kinder, gentler way of killing a specific thread
* that is just as effective.
*/
kill_thread(pid);
#endif
break;
case GIVEUP:
/* gave it our best shot, but alas... If this really
* is a child we are trying to kill and it really hasn't
* exited, we will likely fail to bind to the port
* after the restart.
*/
ap_log_error(APLOG_MARK, APLOG_ERR,
0, ap_server_conf,
"could not make child process %" APR_PID_T_FMT
" exit, "
"attempting to continue anyway",
pid);
break;
}
return 0;
}
void ap_reclaim_child_processes(int terminate)
{
apr_time_t waittime = 1024 * 16;
int i;
extra_process_t *cur_extra;
int not_dead_yet;
int max_daemons;
apr_time_t starttime = apr_time_now();
/* this table of actions and elapsed times tells what action is taken
* at which elapsed time from starting the reclaim
*/
struct {
action_t action;
apr_time_t action_time;
} action_table[] = {
{DO_NOTHING, 0}, /* dummy entry for iterations where we reap
* children but take no action against
* stragglers
*/
{SEND_SIGTERM, apr_time_from_sec(3)},
{SEND_SIGTERM, apr_time_from_sec(5)},
{SEND_SIGTERM, apr_time_from_sec(7)},
{SEND_SIGKILL, apr_time_from_sec(9)},
{GIVEUP, apr_time_from_sec(10)}
};
int cur_action; /* index of action we decided to take this
* iteration
*/
int next_action = 1; /* index of first real action */
ap_mpm_query(AP_MPMQ_MAX_DAEMON_USED, &max_daemons);
do {
apr_sleep(waittime);
/* don't let waittime get longer than 1 second; otherwise, we don't
* react quickly to the last child exiting, and taking action can
* be delayed
*/
waittime = waittime * 4;
if (waittime > apr_time_from_sec(1)) {
waittime = apr_time_from_sec(1);
}
/* see what action to take, if any */
if (action_table[next_action].action_time <= apr_time_now() - starttime) {
cur_action = next_action;
++next_action;
}
else {
cur_action = 0; /* nothing to do */
}
/* now see who is done */
not_dead_yet = 0;
for (i = 0; i < max_daemons; ++i) {
pid_t pid = MPM_CHILD_PID(i);
if (pid == 0) {
continue; /* not every scoreboard entry is in use */
}
if (reclaim_one_pid(pid, action_table[cur_action].action)) {
MPM_NOTE_CHILD_KILLED(i);
}
else {
++not_dead_yet;
}
}
cur_extra = extras;
while (cur_extra) {
extra_process_t *next = cur_extra->next;
if (reclaim_one_pid(cur_extra->pid, action_table[cur_action].action)) {
AP_DEBUG_ASSERT(1 == ap_unregister_extra_mpm_process(cur_extra->pid));
}
else {
++not_dead_yet;
}
cur_extra = next;
}
#if APR_HAS_OTHER_CHILD
apr_proc_other_child_refresh_all(APR_OC_REASON_RESTART);
#endif
} while (not_dead_yet > 0 &&
action_table[cur_action].action != GIVEUP);
}
void ap_relieve_child_processes(void)
{
int i;
extra_process_t *cur_extra;
int max_daemons;
ap_mpm_query(AP_MPMQ_MAX_DAEMON_USED, &max_daemons);
/* now see who is done */
for (i = 0; i < max_daemons; ++i) {
pid_t pid = MPM_CHILD_PID(i);
if (pid == 0) {
continue; /* not every scoreboard entry is in use */
}
if (reclaim_one_pid(pid, DO_NOTHING)) {
MPM_NOTE_CHILD_KILLED(i);
}
}
cur_extra = extras;
while (cur_extra) {
extra_process_t *next = cur_extra->next;
if (reclaim_one_pid(cur_extra->pid, DO_NOTHING)) {
AP_DEBUG_ASSERT(1 == ap_unregister_extra_mpm_process(cur_extra->pid));
}
cur_extra = next;
}
}
/* Before sending the signal to the pid this function verifies that
* the pid is a member of the current process group; either using
* apr_proc_wait(), where waitpid() guarantees to fail for non-child
* processes; or by using getpgid() directly, if available. */
apr_status_t ap_mpm_safe_kill(pid_t pid, int sig)
{
#ifndef HAVE_GETPGID
apr_proc_t proc;
apr_status_t rv;
apr_exit_why_e why;
int status;
/* Ensure pid sanity */
if (pid < 1) {
return APR_EINVAL;
}
proc.pid = pid;
rv = apr_proc_wait(&proc, &status, &why, APR_NOWAIT);
if (rv == APR_CHILD_DONE) {
#ifdef AP_MPM_WANT_PROCESS_CHILD_STATUS
/* The child already died - log the termination status if
* necessary: */
ap_process_child_status(&proc, why, status);
#endif
return APR_EINVAL;
}
else if (rv != APR_CHILD_NOTDONE) {
/* The child is already dead and reaped, or was a bogus pid -
* log this either way. */
ap_log_error(APLOG_MARK, APLOG_NOTICE, rv, ap_server_conf,
"cannot send signal %d to pid %ld (non-child or "
"already dead)", sig, (long)pid);
return APR_EINVAL;
}
#else
pid_t pg;
/* Ensure pid sanity. */
if (pid < 1) {
return APR_EINVAL;
}
pg = getpgid(pid);
if (pg == -1) {
/* Process already dead... */
return errno;
}
if (pg != getpgrp()) {
ap_log_error(APLOG_MARK, APLOG_ALERT, 0, ap_server_conf,
"refusing to send signal %d to pid %ld outside "
"process group", sig, (long)pid);
return APR_EINVAL;
}
#endif
return kill(pid, sig) ? errno : APR_SUCCESS;
}
#endif /* AP_MPM_WANT_RECLAIM_CHILD_PROCESSES */
#ifdef AP_MPM_WANT_WAIT_OR_TIMEOUT
/* number of calls to wait_or_timeout between writable probes */
#ifndef INTERVAL_OF_WRITABLE_PROBES
#define INTERVAL_OF_WRITABLE_PROBES 10
#endif
static int wait_or_timeout_counter;
void ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode, apr_proc_t *ret,
apr_pool_t *p)
{
apr_status_t rv;
++wait_or_timeout_counter;
if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
wait_or_timeout_counter = 0;
ap_run_monitor(p);
}
rv = apr_proc_wait_all_procs(ret, exitcode, status, APR_NOWAIT, p);
if (APR_STATUS_IS_EINTR(rv)) {
ret->pid = -1;
return;
}
if (APR_STATUS_IS_CHILD_DONE(rv)) {
return;
}
apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
ret->pid = -1;
return;
}
#endif /* AP_MPM_WANT_WAIT_OR_TIMEOUT */
#ifdef AP_MPM_WANT_PROCESS_CHILD_STATUS
int ap_process_child_status(apr_proc_t *pid, apr_exit_why_e why, int status)
{
int signum = status;
const char *sigdesc;
/* Child died... if it died due to a fatal error,
* we should simply bail out. The caller needs to
* check for bad rc from us and exit, running any
* appropriate cleanups.
*
* If the child died due to a resource shortage,
* the parent should limit the rate of forking
*/
if (APR_PROC_CHECK_EXIT(why)) {
if (status == APEXIT_CHILDSICK) {
return status;
}
if (status == APEXIT_CHILDFATAL) {
ap_log_error(APLOG_MARK, APLOG_ALERT,
0, ap_server_conf,
"Child %" APR_PID_T_FMT
" returned a Fatal error... Apache is exiting!",
pid->pid);
return APEXIT_CHILDFATAL;
}
return 0;
}
if (APR_PROC_CHECK_SIGNALED(why)) {
sigdesc = apr_signal_description_get(signum);
switch (signum) {
case SIGTERM:
case SIGHUP:
case AP_SIG_GRACEFUL:
case SIGKILL:
break;
default:
if (APR_PROC_CHECK_CORE_DUMP(why)) {
ap_log_error(APLOG_MARK, APLOG_NOTICE,
0, ap_server_conf,
"child pid %ld exit signal %s (%d), "
"possible coredump in %s",
(long)pid->pid, sigdesc, signum,
ap_coredump_dir);
}
else {
ap_log_error(APLOG_MARK, APLOG_NOTICE,
0, ap_server_conf,
"child pid %ld exit signal %s (%d)",
(long)pid->pid, sigdesc, signum);
}
}
}
return 0;
}
#endif /* AP_MPM_WANT_PROCESS_CHILD_STATUS */
#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
void ap_sock_disable_nagle(apr_socket_t *s)
{
/* The Nagle algorithm says that we should delay sending partial
* packets in hopes of getting more data. We don't want to do
* this; we are not telnet. There are bad interactions between
* persistent connections and Nagle's algorithm that have very severe
* performance penalties. (Failing to disable Nagle is not much of a
* problem with simple HTTP.)
*
* In spite of these problems, failure here is not a shooting offense.
*/
apr_status_t status = apr_socket_opt_set(s, APR_TCP_NODELAY, 1);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, status, ap_server_conf,
"apr_socket_opt_set: (TCP_NODELAY)");
}
}
#endif
#ifdef HAVE_GETPWNAM
AP_DECLARE(uid_t) ap_uname2id(const char *name)
{
struct passwd *ent;
if (name[0] == '#')
return (atoi(&name[1]));
if (!(ent = getpwnam(name))) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s: bad user name %s", ap_server_argv0, name);
exit(1);
}
return (ent->pw_uid);
}
#endif
#ifdef HAVE_GETGRNAM
AP_DECLARE(gid_t) ap_gname2id(const char *name)
{
struct group *ent;
if (name[0] == '#')
return (atoi(&name[1]));
if (!(ent = getgrnam(name))) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s: bad group name %s", ap_server_argv0, name);
exit(1);
}
return (ent->gr_gid);
}
#endif
#ifndef HAVE_INITGROUPS
int initgroups(const char *name, gid_t basegid)
{
#if defined(QNX) || defined(MPE) || defined(BEOS) || defined(_OSD_POSIX) || defined(TPF) || defined(__TANDEM) || defined(OS2) || defined(WIN32) || defined(NETWARE)
/* QNX, MPE and BeOS do not appear to support supplementary groups. */
return 0;
#else /* ndef QNX */
gid_t groups[NGROUPS_MAX];
struct group *g;
int index = 0;
setgrent();
groups[index++] = basegid;
while (index < NGROUPS_MAX && ((g = getgrent()) != NULL)) {
if (g->gr_gid != basegid) {
char **names;
for (names = g->gr_mem; *names != NULL; ++names) {
if (!strcmp(*names, name))
groups[index++] = g->gr_gid;
}
}
}
endgrent();
return setgroups(index, groups);
#endif /* def QNX */
}
#endif /* def NEED_INITGROUPS */
#ifdef AP_MPM_USES_POD
AP_DECLARE(apr_status_t) ap_mpm_pod_open(apr_pool_t *p, ap_pod_t **pod)
{
apr_status_t rv;
*pod = apr_palloc(p, sizeof(**pod));
rv = apr_file_pipe_create_ex(&((*pod)->pod_in), &((*pod)->pod_out),
APR_WRITE_BLOCK, p);
if (rv != APR_SUCCESS) {
return rv;
}
apr_file_pipe_timeout_set((*pod)->pod_in, 0);
(*pod)->p = p;
/* close these before exec. */
apr_file_inherit_unset((*pod)->pod_in);
apr_file_inherit_unset((*pod)->pod_out);
return APR_SUCCESS;
}
AP_DECLARE(apr_status_t) ap_mpm_pod_check(ap_pod_t *pod)
{
char c;
apr_size_t len = 1;
apr_status_t rv;
rv = apr_file_read(pod->pod_in, &c, &len);
if ((rv == APR_SUCCESS) && (len == 1)) {
return APR_SUCCESS;
}
if (rv != APR_SUCCESS) {
return rv;
}
return AP_NORESTART;
}
AP_DECLARE(apr_status_t) ap_mpm_pod_close(ap_pod_t *pod)
{
apr_status_t rv;
rv = apr_file_close(pod->pod_out);
if (rv != APR_SUCCESS) {
return rv;
}
rv = apr_file_close(pod->pod_in);
if (rv != APR_SUCCESS) {
return rv;
}
return APR_SUCCESS;
}
static apr_status_t pod_signal_internal(ap_pod_t *pod)
{
apr_status_t rv;
char char_of_death = '!';
apr_size_t one = 1;
rv = apr_file_write(pod->pod_out, &char_of_death, &one);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"write pipe_of_death");
}
return rv;
}
/* This function connects to the server, then immediately closes the connection.
* This permits the MPM to skip the poll when there is only one listening
* socket, because it provides a alternate way to unblock an accept() when
* the pod is used.
*/
static apr_status_t dummy_connection(ap_pod_t *pod)
{
char *srequest;
apr_status_t rv;
apr_socket_t *sock;
apr_pool_t *p;
apr_size_t len;
ap_listen_rec *lp;
/* create a temporary pool for the socket. pconf stays around too long */
rv = apr_pool_create(&p, pod->p);
if (rv != APR_SUCCESS) {
return rv;
}
/* If possible, find a listener which is configured for
* plain-HTTP, not SSL; using an SSL port would either be
* expensive to do correctly (performing a complete SSL handshake)
* or cause log spam by doing incorrectly (simply sending EOF). */
lp = ap_listeners;
while (lp && lp->protocol && strcasecmp(lp->protocol, "http") != 0) {
lp = lp->next;
}
if (!lp) {
lp = ap_listeners;
}
rv = apr_socket_create(&sock, lp->bind_addr->family, SOCK_STREAM, 0, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"get socket to connect to listener");
apr_pool_destroy(p);
return rv;
}
/* on some platforms (e.g., FreeBSD), the kernel won't accept many
* queued connections before it starts blocking local connects...
* we need to keep from blocking too long and instead return an error,
* because the MPM won't want to hold up a graceful restart for a
* long time
*/
rv = apr_socket_timeout_set(sock, apr_time_from_sec(3));
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"set timeout on socket to connect to listener");
apr_socket_close(sock);
apr_pool_destroy(p);
return rv;
}
rv = apr_socket_connect(sock, lp->bind_addr);
if (rv != APR_SUCCESS) {
int log_level = APLOG_WARNING;
if (APR_STATUS_IS_TIMEUP(rv)) {
/* probably some server processes bailed out already and there
* is nobody around to call accept and clear out the kernel
* connection queue; usually this is not worth logging
*/
log_level = APLOG_DEBUG;
}
ap_log_error(APLOG_MARK, log_level, rv, ap_server_conf,
"connect to listener on %pI", lp->bind_addr);
}
/* Create the request string. We include a User-Agent so that
* adminstrators can track down the cause of the odd-looking
* requests in their logs.
*/
srequest = apr_pstrcat(p, "OPTIONS * HTTP/1.0\r\nUser-Agent: ",
ap_get_server_banner(),
" (internal dummy connection)\r\n\r\n", NULL);
/* Since some operating systems support buffering of data or entire
* requests in the kernel, we send a simple request, to make sure
* the server pops out of a blocking accept().
*/
/* XXX: This is HTTP specific. We should look at the Protocol for each
* listener, and send the correct type of request to trigger any Accept
* Filters.
*/
len = strlen(srequest);
apr_socket_send(sock, srequest, &len);
apr_socket_close(sock);
apr_pool_destroy(p);
return rv;
}
AP_DECLARE(apr_status_t) ap_mpm_pod_signal(ap_pod_t *pod)
{
apr_status_t rv;
rv = pod_signal_internal(pod);
if (rv != APR_SUCCESS) {
return rv;
}
return dummy_connection(pod);
}
void ap_mpm_pod_killpg(ap_pod_t *pod, int num)
{
int i;
apr_status_t rv = APR_SUCCESS;
/* we don't write anything to the pod here... we assume
* that the would-be reader of the pod has another way to
* see that it is time to die once we wake it up
*
* writing lots of things to the pod at once is very
* problematic... we can fill the kernel pipe buffer and
* be blocked until somebody consumes some bytes or
* we hit a timeout... if we hit a timeout we can't just
* keep trying because maybe we'll never successfully
* write again... but then maybe we'll leave would-be
* readers stranded (a number of them could be tied up for
* a while serving time-consuming requests)
*/
for (i = 0; i < num && rv == APR_SUCCESS; i++) {
rv = dummy_connection(pod);
}
}
#endif /* #ifdef AP_MPM_USES_POD */
/* standard mpm configuration handling */
#ifdef AP_MPM_WANT_SET_PIDFILE
const char *ap_pid_fname = NULL;
const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
if (cmd->server->is_virtual) {
return "PidFile directive not allowed in <VirtualHost>";
}
ap_pid_fname = arg;
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_SCOREBOARD
const char * ap_mpm_set_scoreboard(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_scoreboard_fname = arg;
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_LOCKFILE
const char *ap_lock_fname = NULL;
const char *ap_mpm_set_lockfile(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_lock_fname = arg;
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_MAX_REQUESTS
int ap_max_requests_per_child = 0;
const char *ap_mpm_set_max_requests(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_max_requests_per_child = atoi(arg);
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_COREDUMPDIR
char ap_coredump_dir[MAX_STRING_LEN];
int ap_coredumpdir_configured;
const char *ap_mpm_set_coredumpdir(cmd_parms *cmd, void *dummy,
const char *arg)
{
apr_status_t rv;
apr_finfo_t finfo;
const char *fname;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
fname = ap_server_root_relative(cmd->pool, arg);
if (!fname) {
return apr_pstrcat(cmd->pool, "Invalid CoreDumpDirectory path ",
arg, NULL);
}
if ((rv = apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool)) != APR_SUCCESS) {
return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
" does not exist", NULL);
}
if (finfo.filetype != APR_DIR) {
return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
" is not a directory", NULL);
}
apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
ap_coredumpdir_configured = 1;
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_GRACEFUL_SHUTDOWN
int ap_graceful_shutdown_timeout = 0;
const char * ap_mpm_set_graceful_shutdown(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_graceful_shutdown_timeout = atoi(arg);
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
apr_lockmech_e ap_accept_lock_mech = APR_LOCK_DEFAULT;
AP_DECLARE(const char *) ap_mpm_set_accept_lock_mech(cmd_parms *cmd,
void *dummy,
const char *arg)
{
apr_status_t rv;
const char *lockfile;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
rv = ap_parse_mutex(arg, cmd->server->process->pool,
&ap_accept_lock_mech, &lockfile);
if ((rv == APR_ENOTIMPL) || (rv == APR_ENOLOCK)) {
return apr_pstrcat(cmd->pool, "Invalid AcceptMutex argument ", arg,
" (" AP_AVAILABLE_MUTEXES_STRING ")", NULL);
} else if (rv == APR_BADARG) {
return apr_pstrcat(cmd->pool, "Invalid AcceptMutex filepath ",
arg, NULL);
}
/* perchild can't use SysV sems because the permissions on the accept
* mutex can't be set to allow all processes to use the mutex and
* at the same time keep all users from being able to dink with the
* mutex
*/
#if defined(PERCHILD_MPM)
if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
return apr_pstrcat(cmd->pool, "Invalid AcceptMutex argument ", arg,
" (" AP_AVAILABLE_MUTEXES_STRING ")", NULL);
}
#endif
if (lockfile && !ap_lock_fname)
ap_lock_fname = lockfile;
return NULL;
}
#endif
#ifdef AP_MPM_WANT_SIGNAL_SERVER
static const char *dash_k_arg;
static int send_signal(pid_t pid, int sig)
{
if (kill(pid, sig) < 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, errno, NULL,
"sending signal to server");
return 1;
}
return 0;
}
int ap_signal_server(int *exit_status, apr_pool_t *pconf)
{
apr_status_t rv;
pid_t otherpid;
int running = 0;
int have_pid_file = 0;
const char *status;
*exit_status = 0;
rv = ap_read_pid(pconf, ap_pid_fname, &otherpid);
if (rv != APR_SUCCESS) {
if (rv != APR_ENOENT) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, NULL,
"Error retrieving pid file %s", ap_pid_fname);
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"Remove it before continuing if it is corrupted.");
*exit_status = 1;
return 1;
}
status = "httpd (no pid file) not running";
}
else {
have_pid_file = 1;
if (kill(otherpid, 0) == 0) {
running = 1;
status = apr_psprintf(pconf,
"httpd (pid %" APR_PID_T_FMT ") already "
"running", otherpid);
}
else {
status = apr_psprintf(pconf,
"httpd (pid %" APR_PID_T_FMT "?) not running",
otherpid);
}
}
if (!strcmp(dash_k_arg, "start")) {
if (running) {
printf("%s\n", status);
return 1;
}
}
if (!strcmp(dash_k_arg, "stop")) {
if (!running) {
printf("%s\n", status);
}
else {
send_signal(otherpid, SIGTERM);
}
return 1;
}
if (!strcmp(dash_k_arg, "restart")) {
if (!running) {
printf("httpd not running, trying to start\n");
}
else {
*exit_status = send_signal(otherpid, SIGHUP);
return 1;
}
}
if (!strcmp(dash_k_arg, "graceful")) {
if (!running) {
printf("httpd not running, trying to start\n");
}
else {
*exit_status = send_signal(otherpid, AP_SIG_GRACEFUL);
return 1;
}
}
if (!strcmp(dash_k_arg, "graceful-stop")) {
#ifdef AP_MPM_WANT_SET_GRACEFUL_SHUTDOWN
if (!running) {
printf("%s\n", status);
}
else {
*exit_status = send_signal(otherpid, AP_SIG_GRACEFUL_STOP);
}
#else
printf("httpd MPM \"" MPM_NAME "\" does not support graceful-stop\n");
#endif
return 1;
}
return 0;
}
void ap_mpm_rewrite_args(process_rec *process)
{
apr_array_header_t *mpm_new_argv;
apr_status_t rv;
apr_getopt_t *opt;
char optbuf[3];
const char *optarg;
int fixed_args;
mpm_new_argv = apr_array_make(process->pool, process->argc,
sizeof(const char **));
*(const char **)apr_array_push(mpm_new_argv) = process->argv[0];
fixed_args = mpm_new_argv->nelts;
apr_getopt_init(&opt, process->pool, process->argc, process->argv);
opt->errfn = NULL;
optbuf[0] = '-';
/* option char returned by apr_getopt() will be stored in optbuf[1] */
optbuf[2] = '\0';
while ((rv = apr_getopt(opt, "k:" AP_SERVER_BASEARGS,
optbuf + 1, &optarg)) == APR_SUCCESS) {
switch(optbuf[1]) {
case 'k':
if (!dash_k_arg) {
if (!strcmp(optarg, "start") || !strcmp(optarg, "stop") ||
!strcmp(optarg, "restart") || !strcmp(optarg, "graceful") ||
!strcmp(optarg, "graceful-stop")) {
dash_k_arg = optarg;
break;
}
}
default:
*(const char **)apr_array_push(mpm_new_argv) =
apr_pstrdup(process->pool, optbuf);
if (optarg) {
*(const char **)apr_array_push(mpm_new_argv) = optarg;
}
}
}
/* back up to capture the bad argument */
if (rv == APR_BADCH || rv == APR_BADARG) {
opt->ind--;
}
while (opt->ind < opt->argc) {
*(const char **)apr_array_push(mpm_new_argv) =
apr_pstrdup(process->pool, opt->argv[opt->ind++]);
}
process->argc = mpm_new_argv->nelts;
process->argv = (const char * const *)mpm_new_argv->elts;
if (dash_k_arg) {
APR_REGISTER_OPTIONAL_FN(ap_signal_server);
}
}
#endif /* AP_MPM_WANT_SIGNAL_SERVER */
#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE
apr_uint32_t ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED;
const char *ap_mpm_set_max_mem_free(cmd_parms *cmd, void *dummy,
const char *arg)
{
long value;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
value = strtol(arg, NULL, 0);
if (value < 0 || errno == ERANGE)
return apr_pstrcat(cmd->pool, "Invalid MaxMemFree value: ",
arg, NULL);
ap_max_mem_free = (apr_uint32_t)value * 1024;
return NULL;
}
#endif /* AP_MPM_WANT_SET_MAX_MEM_FREE */
#ifdef AP_MPM_WANT_SET_STACKSIZE
apr_size_t ap_thread_stacksize = 0; /* use system default */
const char *ap_mpm_set_thread_stacksize(cmd_parms *cmd, void *dummy,
const char *arg)
{
long value;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
value = strtol(arg, NULL, 0);
if (value < 0 || errno == ERANGE)
return apr_pstrcat(cmd->pool, "Invalid ThreadStackSize value: ",
arg, NULL);
ap_thread_stacksize = (apr_size_t)value;
return NULL;
}
#endif /* AP_MPM_WANT_SET_STACKSIZE */
#ifdef AP_MPM_WANT_FATAL_SIGNAL_HANDLER
static pid_t parent_pid, my_pid;
static apr_pool_t *pconf;
#if AP_ENABLE_EXCEPTION_HOOK
static int exception_hook_enabled;
const char *ap_mpm_set_exception_hook(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
if (cmd->server->is_virtual) {
return "EnableExceptionHook directive not allowed in <VirtualHost>";
}
if (strcasecmp(arg, "on") == 0) {
exception_hook_enabled = 1;
}
else if (strcasecmp(arg, "off") == 0) {
exception_hook_enabled = 0;
}
else {
return "parameter must be 'on' or 'off'";
}
return NULL;
}
static void run_fatal_exception_hook(int sig)
{
ap_exception_info_t ei = {0};
if (exception_hook_enabled &&
geteuid() != 0 &&
my_pid != parent_pid) {
ei.sig = sig;
ei.pid = my_pid;
ap_run_fatal_exception(&ei);
}
}
#endif /* AP_ENABLE_EXCEPTION_HOOK */
/* handle all varieties of core dumping signals */
static void sig_coredump(int sig)
{
apr_filepath_set(ap_coredump_dir, pconf);
apr_signal(sig, SIG_DFL);
#if AP_ENABLE_EXCEPTION_HOOK
run_fatal_exception_hook(sig);
#endif
/* linuxthreads issue calling getpid() here:
* This comparison won't match if the crashing thread is
* some module's thread that runs in the parent process.
* The fallout, which is limited to linuxthreads:
* The special log message won't be written when such a
* thread in the parent causes the parent to crash.
*/
if (getpid() == parent_pid) {
ap_log_error(APLOG_MARK, APLOG_NOTICE,
0, ap_server_conf,
"seg fault or similar nasty error detected "
"in the parent process");
/* XXX we can probably add some rudimentary cleanup code here,
* like getting rid of the pid file. If any additional bad stuff
* happens, we are protected from recursive errors taking down the
* system since this function is no longer the signal handler GLA
*/
}
kill(getpid(), sig);
/* At this point we've got sig blocked, because we're still inside
* the signal handler. When we leave the signal handler it will
* be unblocked, and we'll take the signal... and coredump or whatever
* is appropriate for this particular Unix. In addition the parent
* will see the real signal we received -- whereas if we called
* abort() here, the parent would only see SIGABRT.
*/
}
apr_status_t ap_fatal_signal_child_setup(server_rec *s)
{
my_pid = getpid();
return APR_SUCCESS;
}
apr_status_t ap_fatal_signal_setup(server_rec *s, apr_pool_t *in_pconf)
{
#ifndef NO_USE_SIGACTION
struct sigaction sa;
sigemptyset(&sa.sa_mask);
#if defined(SA_ONESHOT)
sa.sa_flags = SA_ONESHOT;
#elif defined(SA_RESETHAND)
sa.sa_flags = SA_RESETHAND;
#else
sa.sa_flags = 0;
#endif
sa.sa_handler = sig_coredump;
if (sigaction(SIGSEGV, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGSEGV)");
#ifdef SIGBUS
if (sigaction(SIGBUS, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGBUS)");
#endif
#ifdef SIGABORT
if (sigaction(SIGABORT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGABORT)");
#endif
#ifdef SIGABRT
if (sigaction(SIGABRT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGABRT)");
#endif
#ifdef SIGILL
if (sigaction(SIGILL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGILL)");
#endif
#ifdef SIGFPE
if (sigaction(SIGFPE, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, s, "sigaction(SIGFPE)");
#endif
#else /* NO_USE_SIGACTION */
apr_signal(SIGSEGV, sig_coredump);
#ifdef SIGBUS
apr_signal(SIGBUS, sig_coredump);
#endif /* SIGBUS */
#ifdef SIGABORT
apr_signal(SIGABORT, sig_coredump);
#endif /* SIGABORT */
#ifdef SIGABRT
apr_signal(SIGABRT, sig_coredump);
#endif /* SIGABRT */
#ifdef SIGILL
apr_signal(SIGILL, sig_coredump);
#endif /* SIGILL */
#ifdef SIGFPE
apr_signal(SIGFPE, sig_coredump);
#endif /* SIGFPE */
#endif /* NO_USE_SIGACTION */
pconf = in_pconf;
parent_pid = my_pid = getpid();
return APR_SUCCESS;
}
#endif /* AP_MPM_WANT_FATAL_SIGNAL_HANDLER */
#ifndef AP_MPM_HAS_USER_CALLBACKS
AP_DECLARE(void) ap_mpm_register_timed_callback(apr_time_t t,
ap_mpm_callback_fn_t *cbfn,
void *baton)
{
abort();
}
#endif /* AP_MPM_HAS_USER_CALLBACKS */
|