forked from FRRouting/frr
-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathwatchfrr.c
1340 lines (1204 loc) · 35.5 KB
/
watchfrr.c
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
/*
* Monitor status of frr daemons and restart if necessary.
*
* Copyright (C) 2004 Andrew J. Schorr
*
* 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <thread.h>
#include <log.h>
#include <network.h>
#include <sigevent.h>
#include <lib/version.h>
#include "command.h"
#include "memory_vty.h"
#include "libfrr.h"
#include "lib_errors.h"
#include <getopt.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <memory.h>
#include <systemd.h>
#include "watchfrr.h"
#include "watchfrr_errors.h"
#ifndef MIN
#define MIN(X,Y) (((X) <= (Y)) ? (X) : (Y))
#endif
/* Macros to help randomize timers. */
#define JITTER(X) ((random() % ((X)+1))-((X)/2))
#define FUZZY(X) ((X)+JITTER((X)/20))
#define DEFAULT_PERIOD 5
#define DEFAULT_TIMEOUT 90
#define DEFAULT_RESTART_TIMEOUT 20
#define DEFAULT_LOGLEVEL LOG_INFO
#define DEFAULT_MIN_RESTART 60
#define DEFAULT_MAX_RESTART 600
#define DEFAULT_RESTART_CMD WATCHFRR_SH_PATH " restart %s"
#define DEFAULT_START_CMD WATCHFRR_SH_PATH " start %s"
#define DEFAULT_STOP_CMD WATCHFRR_SH_PATH " stop %s"
#define PING_TOKEN "PING"
DEFINE_MGROUP(WATCHFRR, "watchfrr")
DEFINE_MTYPE_STATIC(WATCHFRR, WATCHFRR_DAEMON, "watchfrr daemon entry")
/* Needs to be global, referenced somewhere inside libfrr. */
struct thread_master *master;
static bool watch_only = false;
typedef enum {
PHASE_NONE = 0,
PHASE_INIT,
PHASE_STOPS_PENDING,
PHASE_WAITING_DOWN,
PHASE_ZEBRA_RESTART_PENDING,
PHASE_WAITING_ZEBRA_UP
} restart_phase_t;
static const char *phase_str[] = {
"Idle",
"Startup",
"Stop jobs running",
"Waiting for other daemons to come down",
"Zebra restart job running",
"Waiting for zebra to come up",
"Start jobs running",
};
#define PHASE_TIMEOUT (3*gs.restart_timeout)
#define STARTUP_TIMEOUT 55 * 1000
struct restart_info {
const char *name;
const char *what;
pid_t pid;
struct timeval time;
long interval;
struct thread *t_kill;
int kills;
};
static struct global_state {
restart_phase_t phase;
struct thread *t_phase_hanging;
struct thread *t_startup_timeout;
const char *vtydir;
long period;
long timeout;
long restart_timeout;
long min_restart_interval;
long max_restart_interval;
struct daemon *daemons;
const char *restart_command;
const char *start_command;
const char *stop_command;
struct restart_info restart;
int loglevel;
struct daemon *special; /* points to zebra when doing phased restart */
int numdaemons;
int numpids;
int numdown; /* # of daemons that are not UP or UNRESPONSIVE */
} gs = {
.phase = PHASE_INIT,
.vtydir = frr_vtydir,
.period = 1000 * DEFAULT_PERIOD,
.timeout = DEFAULT_TIMEOUT,
.restart_timeout = DEFAULT_RESTART_TIMEOUT,
.loglevel = DEFAULT_LOGLEVEL,
.min_restart_interval = DEFAULT_MIN_RESTART,
.max_restart_interval = DEFAULT_MAX_RESTART,
.restart_command = DEFAULT_RESTART_CMD,
.start_command = DEFAULT_START_CMD,
.stop_command = DEFAULT_STOP_CMD,
};
typedef enum {
DAEMON_INIT,
DAEMON_DOWN,
DAEMON_CONNECTING,
DAEMON_UP,
DAEMON_UNRESPONSIVE
} daemon_state_t;
#define IS_UP(DMN) \
(((DMN)->state == DAEMON_UP) || ((DMN)->state == DAEMON_UNRESPONSIVE))
static const char *state_str[] = {
"Init", "Down", "Connecting", "Up", "Unresponsive",
};
struct daemon {
const char *name;
daemon_state_t state;
int fd;
struct timeval echo_sent;
unsigned int connect_tries;
struct thread *t_wakeup;
struct thread *t_read;
struct thread *t_write;
struct daemon *next;
struct restart_info restart;
};
#define OPTION_MINRESTART 2000
#define OPTION_MAXRESTART 2001
#define OPTION_DRY 2002
static const struct option longopts[] = {
{"daemon", no_argument, NULL, 'd'},
{"statedir", required_argument, NULL, 'S'},
{"loglevel", required_argument, NULL, 'l'},
{"interval", required_argument, NULL, 'i'},
{"timeout", required_argument, NULL, 't'},
{"restart-timeout", required_argument, NULL, 'T'},
{"restart", required_argument, NULL, 'r'},
{"start-command", required_argument, NULL, 's'},
{"kill-command", required_argument, NULL, 'k'},
{"dry", no_argument, NULL, OPTION_DRY},
{"min-restart-interval", required_argument, NULL, OPTION_MINRESTART},
{"max-restart-interval", required_argument, NULL, OPTION_MAXRESTART},
{"pid-file", required_argument, NULL, 'p'},
{"blank-string", required_argument, NULL, 'b'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'v'},
{NULL, 0, NULL, 0}};
static int try_connect(struct daemon *dmn);
static int wakeup_send_echo(struct thread *t_wakeup);
static void try_restart(struct daemon *dmn);
static void phase_check(void);
static void restart_done(struct daemon *dmn);
static const char *progname;
static void printhelp(FILE *target)
{
fprintf(target,
"Usage : %s [OPTION...] <daemon name> ...\n\n\
Watchdog program to monitor status of frr daemons and try to restart\n\
them if they are down or unresponsive. It determines whether a daemon is\n\
up based on whether it can connect to the daemon's vty unix stream socket.\n\
It then repeatedly sends echo commands over that socket to determine whether\n\
the daemon is responsive. If the daemon crashes, we will receive an EOF\n\
on the socket connection and know immediately that the daemon is down.\n\n\
The daemons to be monitored should be listed on the command line.\n\n\
In order to avoid attempting to restart the daemons in a fast loop,\n\
the -m and -M options allow you to control the minimum delay between\n\
restart commands. The minimum restart delay is recalculated each time\n\
a restart is attempted: if the time since the last restart attempt exceeds\n\
twice the -M value, then the restart delay is set to the -m value.\n\
Otherwise, the interval is doubled (but capped at the -M value).\n\n",
progname);
fprintf(target,
"Options:\n\
-d, --daemon Run in daemon mode. In this mode, error messages are sent\n\
to syslog instead of stdout.\n\
-S, --statedir Set the vty socket directory (default is %s)\n\
-l, --loglevel Set the logging level (default is %d).\n\
The value should range from %d (LOG_EMERG) to %d (LOG_DEBUG),\n\
but it can be set higher than %d if extra-verbose debugging\n\
messages are desired.\n\
--min-restart-interval\n\
Set the minimum seconds to wait between invocations of daemon\n\
restart commands (default is %d).\n\
--max-restart-interval\n\
Set the maximum seconds to wait between invocations of daemon\n\
restart commands (default is %d).\n\
-i, --interval Set the status polling interval in seconds (default is %d)\n\
-t, --timeout Set the unresponsiveness timeout in seconds (default is %d)\n\
-T, --restart-timeout\n\
Set the restart (kill) timeout in seconds (default is %d).\n\
If any background jobs are still running after this much\n\
time has elapsed, they will be killed.\n\
-r, --restart Supply a Bourne shell command to use to restart a single\n\
daemon. The command string should include '%%s' where the\n\
name of the daemon should be substituted.\n\
(default: '%s')\n\
-s, --start-command\n\
Supply a Bourne shell to command to use to start a single\n\
daemon. The command string should include '%%s' where the\n\
name of the daemon should be substituted.\n\
(default: '%s')\n\
-k, --kill-command\n\
Supply a Bourne shell to command to use to stop a single\n\
daemon. The command string should include '%%s' where the\n\
name of the daemon should be substituted.\n\
(default: '%s')\n\
--dry Do not start or restart anything, just log.\n\
-p, --pid-file Set process identifier file name\n\
(default is %s/watchfrr.pid).\n\
-b, --blank-string\n\
When the supplied argument string is found in any of the\n\
various shell command arguments (-r, -s, or -k), replace\n\
it with a space. This is an ugly hack to circumvent problems\n\
passing command-line arguments with embedded spaces.\n\
-v, --version Print program version\n\
-h, --help Display this help and exit\n",
frr_vtydir, DEFAULT_LOGLEVEL, LOG_EMERG, LOG_DEBUG, LOG_DEBUG,
DEFAULT_MIN_RESTART, DEFAULT_MAX_RESTART, DEFAULT_PERIOD,
DEFAULT_TIMEOUT, DEFAULT_RESTART_TIMEOUT,
DEFAULT_RESTART_CMD, DEFAULT_START_CMD, DEFAULT_STOP_CMD,
frr_vtydir);
}
static pid_t run_background(char *shell_cmd)
{
pid_t child;
switch (child = fork()) {
case -1:
flog_err_sys(EC_LIB_SYSTEM_CALL,
"fork failed, cannot run command [%s]: %s",
shell_cmd, safe_strerror(errno));
return -1;
case 0:
/* Child process. */
/* Use separate process group so child processes can be killed
* easily. */
if (setpgid(0, 0) < 0)
zlog_warn("warning: setpgid(0,0) failed: %s",
safe_strerror(errno));
{
char shell[] = "sh";
char dashc[] = "-c";
char *const argv[4] = {shell, dashc, shell_cmd, NULL};
execv("/bin/sh", argv);
flog_err_sys(EC_LIB_SYSTEM_CALL,
"execv(/bin/sh -c '%s') failed: %s",
shell_cmd, safe_strerror(errno));
_exit(127);
}
default:
/* Parent process: we will reap the child later. */
flog_err_sys(EC_LIB_SYSTEM_CALL,
"Forked background command [pid %d]: %s",
(int)child, shell_cmd);
return child;
}
}
static struct timeval *time_elapsed(struct timeval *result,
const struct timeval *start_time)
{
gettimeofday(result, NULL);
result->tv_sec -= start_time->tv_sec;
result->tv_usec -= start_time->tv_usec;
while (result->tv_usec < 0) {
result->tv_usec += 1000000L;
result->tv_sec--;
}
return result;
}
static int restart_kill(struct thread *t_kill)
{
struct restart_info *restart = THREAD_ARG(t_kill);
struct timeval delay;
time_elapsed(&delay, &restart->time);
zlog_warn(
"Warning: %s %s child process %d still running after "
"%ld seconds, sending signal %d",
restart->what, restart->name, (int)restart->pid,
(long)delay.tv_sec, (restart->kills ? SIGKILL : SIGTERM));
kill(-restart->pid, (restart->kills ? SIGKILL : SIGTERM));
restart->kills++;
restart->t_kill = NULL;
thread_add_timer(master, restart_kill, restart, gs.restart_timeout,
&restart->t_kill);
return 0;
}
static struct restart_info *find_child(pid_t child)
{
struct daemon *dmn;
if (gs.restart.pid == child)
return &gs.restart;
for (dmn = gs.daemons; dmn; dmn = dmn->next) {
if (dmn->restart.pid == child)
return &dmn->restart;
}
return NULL;
}
static void sigchild(void)
{
pid_t child;
int status;
const char *name;
const char *what;
struct restart_info *restart;
struct daemon *dmn;
switch (child = waitpid(-1, &status, WNOHANG)) {
case -1:
flog_err_sys(EC_LIB_SYSTEM_CALL, "waitpid failed: %s",
safe_strerror(errno));
return;
case 0:
zlog_warn("SIGCHLD received, but waitpid did not reap a child");
return;
}
if (child == integrated_write_pid) {
integrated_write_sigchld(status);
return;
}
if ((restart = find_child(child)) != NULL) {
name = restart->name;
what = restart->what;
restart->pid = 0;
gs.numpids--;
thread_cancel(restart->t_kill);
restart->t_kill = NULL;
/* Update restart time to reflect the time the command
* completed. */
gettimeofday(&restart->time, NULL);
} else {
flog_err_sys(
EC_LIB_SYSTEM_CALL,
"waitpid returned status for an unknown child process %d",
(int)child);
name = "(unknown)";
what = "background";
}
if (WIFSTOPPED(status))
zlog_warn("warning: %s %s process %d is stopped", what, name,
(int)child);
else if (WIFSIGNALED(status))
zlog_warn("%s %s process %d terminated due to signal %d", what,
name, (int)child, WTERMSIG(status));
else if (WIFEXITED(status)) {
if (WEXITSTATUS(status) != 0)
zlog_warn(
"%s %s process %d exited with non-zero status %d",
what, name, (int)child, WEXITSTATUS(status));
else {
zlog_debug("%s %s process %d exited normally", what,
name, (int)child);
if (restart && restart != &gs.restart) {
dmn = container_of(restart, struct daemon,
restart);
restart_done(dmn);
} else if (restart)
for (dmn = gs.daemons; dmn; dmn = dmn->next)
restart_done(dmn);
}
} else
flog_err_sys(
EC_LIB_SYSTEM_CALL,
"cannot interpret %s %s process %d wait status 0x%x",
what, name, (int)child, status);
phase_check();
}
static int run_job(struct restart_info *restart, const char *cmdtype,
const char *command, int force, int update_interval)
{
struct timeval delay;
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug("attempting to %s %s", cmdtype, restart->name);
if (restart->pid) {
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug(
"cannot %s %s, previous pid %d still running",
cmdtype, restart->name, (int)restart->pid);
return -1;
}
/* Note: time_elapsed test must come before the force test, since we
need
to make sure that delay is initialized for use below in updating the
restart interval. */
if ((time_elapsed(&delay, &restart->time)->tv_sec < restart->interval)
&& !force) {
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug(
"postponing %s %s: "
"elapsed time %ld < retry interval %ld",
cmdtype, restart->name, (long)delay.tv_sec,
restart->interval);
return -1;
}
gettimeofday(&restart->time, NULL);
restart->kills = 0;
{
char cmd[strlen(command) + strlen(restart->name) + 1];
snprintf(cmd, sizeof(cmd), command, restart->name);
if ((restart->pid = run_background(cmd)) > 0) {
restart->t_kill = NULL;
thread_add_timer(master, restart_kill, restart,
gs.restart_timeout, &restart->t_kill);
restart->what = cmdtype;
gs.numpids++;
} else
restart->pid = 0;
}
/* Calculate the new restart interval. */
if (update_interval) {
if (delay.tv_sec > 2 * gs.max_restart_interval)
restart->interval = gs.min_restart_interval;
else if ((restart->interval *= 2) > gs.max_restart_interval)
restart->interval = gs.max_restart_interval;
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug("restart %s interval is now %ld",
restart->name, restart->interval);
}
return restart->pid;
}
#define SET_READ_HANDLER(DMN) \
do { \
(DMN)->t_read = NULL; \
thread_add_read(master, handle_read, (DMN), (DMN)->fd, \
&(DMN)->t_read); \
} while (0);
#define SET_WAKEUP_DOWN(DMN) \
do { \
(DMN)->t_wakeup = NULL; \
thread_add_timer_msec(master, wakeup_down, (DMN), \
FUZZY(gs.period), &(DMN)->t_wakeup); \
} while (0);
#define SET_WAKEUP_UNRESPONSIVE(DMN) \
do { \
(DMN)->t_wakeup = NULL; \
thread_add_timer_msec(master, wakeup_unresponsive, (DMN), \
FUZZY(gs.period), &(DMN)->t_wakeup); \
} while (0);
#define SET_WAKEUP_ECHO(DMN) \
do { \
(DMN)->t_wakeup = NULL; \
thread_add_timer_msec(master, wakeup_send_echo, (DMN), \
FUZZY(gs.period), &(DMN)->t_wakeup); \
} while (0);
static int wakeup_down(struct thread *t_wakeup)
{
struct daemon *dmn = THREAD_ARG(t_wakeup);
dmn->t_wakeup = NULL;
if (try_connect(dmn) < 0)
SET_WAKEUP_DOWN(dmn);
if ((dmn->connect_tries > 1) && (dmn->state != DAEMON_UP))
try_restart(dmn);
return 0;
}
static int wakeup_init(struct thread *t_wakeup)
{
struct daemon *dmn = THREAD_ARG(t_wakeup);
dmn->t_wakeup = NULL;
if (try_connect(dmn) < 0) {
flog_err(EC_WATCHFRR_CONNECTION,
"%s state -> down : initial connection attempt failed",
dmn->name);
dmn->state = DAEMON_DOWN;
}
phase_check();
return 0;
}
static void restart_done(struct daemon *dmn)
{
if (dmn->state != DAEMON_DOWN) {
zlog_warn("wtf?");
return;
}
if (dmn->t_wakeup)
THREAD_OFF(dmn->t_wakeup);
if (try_connect(dmn) < 0)
SET_WAKEUP_DOWN(dmn);
}
static void daemon_down(struct daemon *dmn, const char *why)
{
if (IS_UP(dmn) || (dmn->state == DAEMON_INIT))
flog_err(EC_WATCHFRR_CONNECTION, "%s state -> down : %s",
dmn->name, why);
else if (gs.loglevel > LOG_DEBUG)
zlog_debug("%s still down : %s", dmn->name, why);
if (IS_UP(dmn))
gs.numdown++;
dmn->state = DAEMON_DOWN;
if (dmn->fd >= 0) {
close(dmn->fd);
dmn->fd = -1;
}
THREAD_OFF(dmn->t_read);
THREAD_OFF(dmn->t_write);
THREAD_OFF(dmn->t_wakeup);
if (try_connect(dmn) < 0)
SET_WAKEUP_DOWN(dmn);
phase_check();
}
static int handle_read(struct thread *t_read)
{
struct daemon *dmn = THREAD_ARG(t_read);
static const char resp[sizeof(PING_TOKEN) + 4] = PING_TOKEN "\n";
char buf[sizeof(resp) + 100];
ssize_t rc;
struct timeval delay;
dmn->t_read = NULL;
if ((rc = read(dmn->fd, buf, sizeof(buf))) < 0) {
char why[100];
if (ERRNO_IO_RETRY(errno)) {
/* Pretend it never happened. */
SET_READ_HANDLER(dmn);
return 0;
}
snprintf(why, sizeof(why), "unexpected read error: %s",
safe_strerror(errno));
daemon_down(dmn, why);
return 0;
}
if (rc == 0) {
daemon_down(dmn, "read returned EOF");
return 0;
}
if (!dmn->echo_sent.tv_sec) {
char why[sizeof(buf) + 100];
snprintf(why, sizeof(why),
"unexpected read returns %d bytes: %.*s", (int)rc,
(int)rc, buf);
daemon_down(dmn, why);
return 0;
}
/* We are expecting an echo response: is there any chance that the
response would not be returned entirely in the first read? That
seems inconceivable... */
if ((rc != sizeof(resp)) || memcmp(buf, resp, sizeof(resp))) {
char why[100 + sizeof(buf)];
snprintf(why, sizeof(why),
"read returned bad echo response of %d bytes "
"(expecting %u): %.*s",
(int)rc, (unsigned int)sizeof(resp), (int)rc, buf);
daemon_down(dmn, why);
return 0;
}
time_elapsed(&delay, &dmn->echo_sent);
dmn->echo_sent.tv_sec = 0;
if (dmn->state == DAEMON_UNRESPONSIVE) {
if (delay.tv_sec < gs.timeout) {
dmn->state = DAEMON_UP;
zlog_warn(
"%s state -> up : echo response received after %ld.%06ld "
"seconds",
dmn->name, (long)delay.tv_sec,
(long)delay.tv_usec);
} else
zlog_warn(
"%s: slow echo response finally received after %ld.%06ld "
"seconds",
dmn->name, (long)delay.tv_sec,
(long)delay.tv_usec);
} else if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug("%s: echo response received after %ld.%06ld seconds",
dmn->name, (long)delay.tv_sec, (long)delay.tv_usec);
SET_READ_HANDLER(dmn);
if (dmn->t_wakeup)
thread_cancel(dmn->t_wakeup);
SET_WAKEUP_ECHO(dmn);
return 0;
}
/*
* Wait till we notice that all daemons are ready before
* we send we are ready to systemd
*/
static void daemon_send_ready(int exitcode)
{
FILE *fp;
static int sent = 0;
char started[1024];
if (sent)
return;
if (exitcode == 0)
zlog_notice("all daemons up, doing startup-complete notify");
else if (gs.numdown < gs.numdaemons)
flog_err(EC_WATCHFRR_CONNECTION,
"startup did not complete within timeout"
" (%d/%d daemons running)",
gs.numdaemons - gs.numdown, gs.numdaemons);
else {
flog_err(EC_WATCHFRR_CONNECTION,
"all configured daemons failed to start"
" -- exiting watchfrr");
exit(exitcode);
}
frr_detach();
snprintf(started, sizeof(started), "%s%s", frr_vtydir,
"watchfrr.started");
fp = fopen(started, "w");
if (fp)
fclose(fp);
#if defined HAVE_SYSTEMD
systemd_send_started(master, 0);
#endif
sent = 1;
}
static void daemon_up(struct daemon *dmn, const char *why)
{
dmn->state = DAEMON_UP;
gs.numdown--;
dmn->connect_tries = 0;
zlog_notice("%s state -> up : %s", dmn->name, why);
if (gs.numdown == 0)
daemon_send_ready(0);
SET_WAKEUP_ECHO(dmn);
phase_check();
}
static int check_connect(struct thread *t_write)
{
struct daemon *dmn = THREAD_ARG(t_write);
int sockerr;
socklen_t reslen = sizeof(sockerr);
dmn->t_write = NULL;
if (getsockopt(dmn->fd, SOL_SOCKET, SO_ERROR, (char *)&sockerr, &reslen)
< 0) {
zlog_warn("%s: check_connect: getsockopt failed: %s", dmn->name,
safe_strerror(errno));
daemon_down(dmn,
"getsockopt failed checking connection success");
return 0;
}
if ((reslen == sizeof(sockerr)) && sockerr) {
char why[100];
snprintf(
why, sizeof(why),
"getsockopt reports that connection attempt failed: %s",
safe_strerror(sockerr));
daemon_down(dmn, why);
return 0;
}
daemon_up(dmn, "delayed connect succeeded");
return 0;
}
static int wakeup_connect_hanging(struct thread *t_wakeup)
{
struct daemon *dmn = THREAD_ARG(t_wakeup);
char why[100];
dmn->t_wakeup = NULL;
snprintf(why, sizeof(why),
"connection attempt timed out after %ld seconds", gs.timeout);
daemon_down(dmn, why);
return 0;
}
/* Making connection to protocol daemon. */
static int try_connect(struct daemon *dmn)
{
int sock;
struct sockaddr_un addr;
socklen_t len;
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug("%s: attempting to connect", dmn->name);
dmn->connect_tries++;
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s.vty", gs.vtydir,
dmn->name);
#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
len = addr.sun_len = SUN_LEN(&addr);
#else
len = sizeof(addr.sun_family) + strlen(addr.sun_path);
#endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */
/* Quick check to see if we might succeed before we go to the trouble
of creating a socket. */
if (access(addr.sun_path, W_OK) < 0) {
if (errno != ENOENT)
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s: access to socket %s denied: %s",
dmn->name, addr.sun_path,
safe_strerror(errno));
return -1;
}
if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
flog_err_sys(EC_LIB_SOCKET, "%s(%s): cannot make socket: %s",
__func__, addr.sun_path, safe_strerror(errno));
return -1;
}
if (set_nonblocking(sock) < 0 || set_cloexec(sock) < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s(%s): set_nonblocking/cloexec(%d) failed",
__func__, addr.sun_path, sock);
close(sock);
return -1;
}
if (connect(sock, (struct sockaddr *)&addr, len) < 0) {
if ((errno != EINPROGRESS) && (errno != EWOULDBLOCK)) {
if (gs.loglevel > LOG_DEBUG)
zlog_debug("%s(%s): connect failed: %s",
__func__, addr.sun_path,
safe_strerror(errno));
close(sock);
return -1;
}
if (gs.loglevel > LOG_DEBUG)
zlog_debug("%s: connection in progress", dmn->name);
dmn->state = DAEMON_CONNECTING;
dmn->fd = sock;
dmn->t_write = NULL;
thread_add_write(master, check_connect, dmn, dmn->fd,
&dmn->t_write);
dmn->t_wakeup = NULL;
thread_add_timer(master, wakeup_connect_hanging, dmn,
gs.timeout, &dmn->t_wakeup);
SET_READ_HANDLER(dmn);
return 0;
}
dmn->fd = sock;
SET_READ_HANDLER(dmn);
daemon_up(dmn, "connect succeeded");
return 1;
}
static int phase_hanging(struct thread *t_hanging)
{
gs.t_phase_hanging = NULL;
flog_err(EC_WATCHFRR_CONNECTION,
"Phase [%s] hanging for %ld seconds, aborting phased restart",
phase_str[gs.phase], PHASE_TIMEOUT);
gs.phase = PHASE_NONE;
return 0;
}
static void set_phase(restart_phase_t new_phase)
{
gs.phase = new_phase;
if (gs.t_phase_hanging)
thread_cancel(gs.t_phase_hanging);
gs.t_phase_hanging = NULL;
thread_add_timer(master, phase_hanging, NULL, PHASE_TIMEOUT,
&gs.t_phase_hanging);
}
static void phase_check(void)
{
struct daemon *dmn;
switch (gs.phase) {
case PHASE_NONE:
break;
case PHASE_INIT:
for (dmn = gs.daemons; dmn; dmn = dmn->next)
if (dmn->state == DAEMON_INIT)
return;
/* startup complete, everything out of INIT */
gs.phase = PHASE_NONE;
for (dmn = gs.daemons; dmn; dmn = dmn->next)
if (dmn->state == DAEMON_DOWN) {
SET_WAKEUP_DOWN(dmn);
try_restart(dmn);
}
break;
case PHASE_STOPS_PENDING:
if (gs.numpids)
break;
zlog_info(
"Phased restart: all routing daemon stop jobs have completed.");
set_phase(PHASE_WAITING_DOWN);
/*FALLTHRU*/
case PHASE_WAITING_DOWN:
if (gs.numdown + IS_UP(gs.special) < gs.numdaemons)
break;
zlog_info("Phased restart: all routing daemons now down.");
run_job(&gs.special->restart, "restart", gs.restart_command, 1,
1);
set_phase(PHASE_ZEBRA_RESTART_PENDING);
/*FALLTHRU*/
case PHASE_ZEBRA_RESTART_PENDING:
if (gs.special->restart.pid)
break;
zlog_info("Phased restart: %s restart job completed.",
gs.special->name);
set_phase(PHASE_WAITING_ZEBRA_UP);
/*FALLTHRU*/
case PHASE_WAITING_ZEBRA_UP:
if (!IS_UP(gs.special))
break;
zlog_info("Phased restart: %s is now up.", gs.special->name);
{
struct daemon *dmn;
for (dmn = gs.daemons; dmn; dmn = dmn->next) {
if (dmn != gs.special)
run_job(&dmn->restart, "start",
gs.start_command, 1, 0);
}
}
gs.phase = PHASE_NONE;
THREAD_OFF(gs.t_phase_hanging);
zlog_notice("Phased global restart has completed.");
break;
}
}
static void try_restart(struct daemon *dmn)
{
if (watch_only)
return;
if (dmn != gs.special) {
if ((gs.special->state == DAEMON_UP)
&& (gs.phase == PHASE_NONE))
run_job(&dmn->restart, "restart", gs.restart_command, 0,
1);
else
zlog_debug(
"%s: postponing restart attempt because master %s daemon "
"not up [%s], or phased restart in progress",
dmn->name, gs.special->name,
state_str[gs.special->state]);
return;
}
if ((gs.phase != PHASE_NONE) || gs.numpids) {
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug(
"postponing phased global restart: restart already in "
"progress [%s], or outstanding child processes [%d]",
phase_str[gs.phase], gs.numpids);
return;
}
/* Is it too soon for a restart? */
{
struct timeval delay;
if (time_elapsed(&delay, &gs.special->restart.time)->tv_sec
< gs.special->restart.interval) {
if (gs.loglevel > LOG_DEBUG + 1)
zlog_debug(
"postponing phased global restart: "
"elapsed time %ld < retry interval %ld",
(long)delay.tv_sec,
gs.special->restart.interval);
return;
}
}
run_job(&gs.restart, "restart", gs.restart_command, 0, 1);
}
static int wakeup_unresponsive(struct thread *t_wakeup)
{
struct daemon *dmn = THREAD_ARG(t_wakeup);
dmn->t_wakeup = NULL;
if (dmn->state != DAEMON_UNRESPONSIVE)
flog_err(EC_WATCHFRR_CONNECTION,
"%s: no longer unresponsive (now %s), "
"wakeup should have been cancelled!",
dmn->name, state_str[dmn->state]);
else {
SET_WAKEUP_UNRESPONSIVE(dmn);
try_restart(dmn);
}
return 0;
}
static int wakeup_no_answer(struct thread *t_wakeup)
{
struct daemon *dmn = THREAD_ARG(t_wakeup);
dmn->t_wakeup = NULL;
dmn->state = DAEMON_UNRESPONSIVE;
flog_err(EC_WATCHFRR_CONNECTION,
"%s state -> unresponsive : no response yet to ping "
"sent %ld seconds ago",
dmn->name, gs.timeout);
SET_WAKEUP_UNRESPONSIVE(dmn);
try_restart(dmn);
return 0;
}
static int wakeup_send_echo(struct thread *t_wakeup)
{
static const char echocmd[] = "echo " PING_TOKEN;
ssize_t rc;
struct daemon *dmn = THREAD_ARG(t_wakeup);
dmn->t_wakeup = NULL;
if (((rc = write(dmn->fd, echocmd, sizeof(echocmd))) < 0)
|| ((size_t)rc != sizeof(echocmd))) {
char why[100 + sizeof(echocmd)];
snprintf(why, sizeof(why),
"write '%s' returned %d instead of %u", echocmd,
(int)rc, (unsigned int)sizeof(echocmd));
daemon_down(dmn, why);
} else {
gettimeofday(&dmn->echo_sent, NULL);
dmn->t_wakeup = NULL;
thread_add_timer(master, wakeup_no_answer, dmn, gs.timeout,
&dmn->t_wakeup);
}
return 0;
}
bool check_all_up(void)
{
struct daemon *dmn;
for (dmn = gs.daemons; dmn; dmn = dmn->next)