2 * Monitor status of frr daemons and restart if necessary.
4 * Copyright (C) 2004 Andrew J. Schorr
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <lib/version.h>
28 #include "memory_vty.h"
40 #define MIN(X,Y) (((X) <= (Y)) ? (X) : (Y))
43 /* Macros to help randomize timers. */
44 #define JITTER(X) ((random() % ((X)+1))-((X)/2))
45 #define FUZZY(X) ((X)+JITTER((X)/20))
47 #define DEFAULT_PERIOD 5
48 #define DEFAULT_TIMEOUT 10
49 #define DEFAULT_RESTART_TIMEOUT 20
50 #define DEFAULT_LOGLEVEL LOG_INFO
51 #define DEFAULT_MIN_RESTART 60
52 #define DEFAULT_MAX_RESTART 600
54 #define PING_TOKEN "PING"
56 /* Needs to be global, referenced somewhere inside libfrr. */
57 struct thread_master
*master
;
58 static char pidfile_default
[256];
60 static bool watch_only
= false;
66 PHASE_ZEBRA_RESTART_PENDING
,
67 PHASE_WAITING_ZEBRA_UP
70 static const char *phase_str
[] = {
73 "Waiting for other daemons to come down",
74 "Zebra restart job running",
75 "Waiting for zebra to come up",
79 #define PHASE_TIMEOUT (3*gs.restart_timeout)
87 struct thread
*t_kill
;
91 static struct global_state
{
92 restart_phase_t phase
;
93 struct thread
*t_phase_hanging
;
98 long min_restart_interval
;
99 long max_restart_interval
;
100 struct daemon
*daemons
;
101 const char *restart_command
;
102 const char *start_command
;
103 const char *stop_command
;
104 struct restart_info restart
;
106 struct daemon
*special
; /* points to zebra when doing phased restart */
109 int numdown
; /* # of daemons that are not UP or UNRESPONSIVE */
112 .vtydir
= frr_vtydir
,
113 .period
= 1000 * DEFAULT_PERIOD
,
114 .timeout
= DEFAULT_TIMEOUT
,
115 .restart_timeout
= DEFAULT_RESTART_TIMEOUT
,
116 .loglevel
= DEFAULT_LOGLEVEL
,
117 .min_restart_interval
= DEFAULT_MIN_RESTART
,
118 .max_restart_interval
= DEFAULT_MAX_RESTART
,
130 (((DMN)->state == DAEMON_UP) || ((DMN)->state == DAEMON_UNRESPONSIVE))
132 static const char *state_str
[] = {
133 "Init", "Down", "Connecting", "Up", "Unresponsive",
138 daemon_state_t state
;
140 struct timeval echo_sent
;
142 struct thread
*t_wakeup
;
143 struct thread
*t_read
;
144 struct thread
*t_write
;
146 struct restart_info restart
;
149 #define OPTION_MINRESTART 2000
150 #define OPTION_MAXRESTART 2001
151 #define OPTION_DRY 2002
153 static const struct option longopts
[] = {
154 {"daemon", no_argument
, NULL
, 'd'},
155 {"statedir", required_argument
, NULL
, 'S'},
156 {"loglevel", required_argument
, NULL
, 'l'},
157 {"interval", required_argument
, NULL
, 'i'},
158 {"timeout", required_argument
, NULL
, 't'},
159 {"restart-timeout", required_argument
, NULL
, 'T'},
160 {"restart", required_argument
, NULL
, 'r'},
161 {"start-command", required_argument
, NULL
, 's'},
162 {"kill-command", required_argument
, NULL
, 'k'},
163 {"dry", no_argument
, NULL
, OPTION_DRY
},
164 {"min-restart-interval", required_argument
, NULL
, OPTION_MINRESTART
},
165 {"max-restart-interval", required_argument
, NULL
, OPTION_MAXRESTART
},
166 {"pid-file", required_argument
, NULL
, 'p'},
167 {"blank-string", required_argument
, NULL
, 'b'},
168 {"help", no_argument
, NULL
, 'h'},
169 {"version", no_argument
, NULL
, 'v'},
172 static int try_connect(struct daemon
*dmn
);
173 static int wakeup_send_echo(struct thread
*t_wakeup
);
174 static void try_restart(struct daemon
*dmn
);
175 static void phase_check(void);
177 static const char *progname
;
178 static void printhelp(FILE *target
)
181 "Usage : %s [OPTION...] <daemon name> ...\n\n\
182 Watchdog program to monitor status of frr daemons and try to restart\n\
183 them if they are down or unresponsive. It determines whether a daemon is\n\
184 up based on whether it can connect to the daemon's vty unix stream socket.\n\
185 It then repeatedly sends echo commands over that socket to determine whether\n\
186 the daemon is responsive. If the daemon crashes, we will receive an EOF\n\
187 on the socket connection and know immediately that the daemon is down.\n\n\
188 The daemons to be monitored should be listed on the command line.\n\n\
189 In order to avoid attempting to restart the daemons in a fast loop,\n\
190 the -m and -M options allow you to control the minimum delay between\n\
191 restart commands. The minimum restart delay is recalculated each time\n\
192 a restart is attempted: if the time since the last restart attempt exceeds\n\
193 twice the -M value, then the restart delay is set to the -m value.\n\
194 Otherwise, the interval is doubled (but capped at the -M value).\n\n",
199 -d, --daemon Run in daemon mode. In this mode, error messages are sent\n\
200 to syslog instead of stdout.\n\
201 -S, --statedir Set the vty socket directory (default is %s)\n\
202 -l, --loglevel Set the logging level (default is %d).\n\
203 The value should range from %d (LOG_EMERG) to %d (LOG_DEBUG),\n\
204 but it can be set higher than %d if extra-verbose debugging\n\
205 messages are desired.\n\
206 --min-restart-interval\n\
207 Set the minimum seconds to wait between invocations of daemon\n\
208 restart commands (default is %d).\n\
209 --max-restart-interval\n\
210 Set the maximum seconds to wait between invocations of daemon\n\
211 restart commands (default is %d).\n\
212 -i, --interval Set the status polling interval in seconds (default is %d)\n\
213 -t, --timeout Set the unresponsiveness timeout in seconds (default is %d)\n\
214 -T, --restart-timeout\n\
215 Set the restart (kill) timeout in seconds (default is %d).\n\
216 If any background jobs are still running after this much\n\
217 time has elapsed, they will be killed.\n\
218 -r, --restart Supply a Bourne shell command to use to restart a single\n\
219 daemon. The command string should include '%%s' where the\n\
220 name of the daemon should be substituted.\n\
221 -s, --start-command\n\
222 Supply a Bourne shell to command to use to start a single\n\
223 daemon. The command string should include '%%s' where the\n\
224 name of the daemon should be substituted.\n\
225 -k, --kill-command\n\
226 Supply a Bourne shell to command to use to stop a single\n\
227 daemon. The command string should include '%%s' where the\n\
228 name of the daemon should be substituted.\n\
229 --dry Do not start or restart anything, just log.\n\
230 -p, --pid-file Set process identifier file name\n\
232 -b, --blank-string\n\
233 When the supplied argument string is found in any of the\n\
234 various shell command arguments (-r, -s, or -k), replace\n\
235 it with a space. This is an ugly hack to circumvent problems\n\
236 passing command-line arguments with embedded spaces.\n\
237 -v, --version Print program version\n\
238 -h, --help Display this help and exit\n",
239 frr_vtydir
, DEFAULT_LOGLEVEL
, LOG_EMERG
, LOG_DEBUG
, LOG_DEBUG
,
240 DEFAULT_MIN_RESTART
, DEFAULT_MAX_RESTART
, DEFAULT_PERIOD
,
241 DEFAULT_TIMEOUT
, DEFAULT_RESTART_TIMEOUT
, pidfile_default
);
244 static pid_t
run_background(char *shell_cmd
)
248 switch (child
= fork()) {
250 zlog_err("fork failed, cannot run command [%s]: %s", shell_cmd
,
251 safe_strerror(errno
));
255 /* Use separate process group so child processes can be killed
257 if (setpgid(0, 0) < 0)
258 zlog_warn("warning: setpgid(0,0) failed: %s",
259 safe_strerror(errno
));
263 char *const argv
[4] = {shell
, dashc
, shell_cmd
, NULL
};
264 execv("/bin/sh", argv
);
265 zlog_err("execv(/bin/sh -c '%s') failed: %s", shell_cmd
,
266 safe_strerror(errno
));
270 /* Parent process: we will reap the child later. */
271 zlog_err("Forked background command [pid %d]: %s", (int)child
,
277 static struct timeval
*time_elapsed(struct timeval
*result
,
278 const struct timeval
*start_time
)
280 gettimeofday(result
, NULL
);
281 result
->tv_sec
-= start_time
->tv_sec
;
282 result
->tv_usec
-= start_time
->tv_usec
;
283 while (result
->tv_usec
< 0) {
284 result
->tv_usec
+= 1000000L;
290 static int restart_kill(struct thread
*t_kill
)
292 struct restart_info
*restart
= THREAD_ARG(t_kill
);
293 struct timeval delay
;
295 time_elapsed(&delay
, &restart
->time
);
297 "Warning: %s %s child process %d still running after "
298 "%ld seconds, sending signal %d",
299 restart
->what
, restart
->name
, (int)restart
->pid
,
300 (long)delay
.tv_sec
, (restart
->kills
? SIGKILL
: SIGTERM
));
301 kill(-restart
->pid
, (restart
->kills
? SIGKILL
: SIGTERM
));
303 restart
->t_kill
= NULL
;
304 thread_add_timer(master
, restart_kill
, restart
, gs
.restart_timeout
,
309 static struct restart_info
*find_child(pid_t child
)
312 for (dmn
= gs
.daemons
; dmn
; dmn
= dmn
->next
) {
313 if (dmn
->restart
.pid
== child
)
314 return &dmn
->restart
;
319 static void sigchild(void)
325 struct restart_info
*restart
;
327 switch (child
= waitpid(-1, &status
, WNOHANG
)) {
329 zlog_err("waitpid failed: %s", safe_strerror(errno
));
332 zlog_warn("SIGCHLD received, but waitpid did not reap a child");
336 if (child
== integrated_write_pid
) {
337 integrated_write_sigchld(status
);
341 if ((restart
= find_child(child
)) != NULL
) {
342 name
= restart
->name
;
343 what
= restart
->what
;
346 thread_cancel(restart
->t_kill
);
347 restart
->t_kill
= NULL
;
348 /* Update restart time to reflect the time the command
350 gettimeofday(&restart
->time
, NULL
);
353 "waitpid returned status for an unknown child process %d",
358 if (WIFSTOPPED(status
))
359 zlog_warn("warning: %s %s process %d is stopped", what
, name
,
361 else if (WIFSIGNALED(status
))
362 zlog_warn("%s %s process %d terminated due to signal %d", what
,
363 name
, (int)child
, WTERMSIG(status
));
364 else if (WIFEXITED(status
)) {
365 if (WEXITSTATUS(status
) != 0)
367 "%s %s process %d exited with non-zero status %d",
368 what
, name
, (int)child
, WEXITSTATUS(status
));
370 zlog_debug("%s %s process %d exited normally", what
,
373 zlog_err("cannot interpret %s %s process %d wait status 0x%x",
374 what
, name
, (int)child
, status
);
378 static int run_job(struct restart_info
*restart
, const char *cmdtype
,
379 const char *command
, int force
, int update_interval
)
381 struct timeval delay
;
383 if (gs
.loglevel
> LOG_DEBUG
+ 1)
384 zlog_debug("attempting to %s %s", cmdtype
, restart
->name
);
387 if (gs
.loglevel
> LOG_DEBUG
+ 1)
389 "cannot %s %s, previous pid %d still running",
390 cmdtype
, restart
->name
, (int)restart
->pid
);
394 /* Note: time_elapsed test must come before the force test, since we
396 to make sure that delay is initialized for use below in updating the
398 if ((time_elapsed(&delay
, &restart
->time
)->tv_sec
< restart
->interval
)
400 if (gs
.loglevel
> LOG_DEBUG
+ 1)
403 "elapsed time %ld < retry interval %ld",
404 cmdtype
, restart
->name
, (long)delay
.tv_sec
,
409 gettimeofday(&restart
->time
, NULL
);
412 char cmd
[strlen(command
) + strlen(restart
->name
) + 1];
413 snprintf(cmd
, sizeof(cmd
), command
, restart
->name
);
414 if ((restart
->pid
= run_background(cmd
)) > 0) {
415 restart
->t_kill
= NULL
;
416 thread_add_timer(master
, restart_kill
, restart
,
417 gs
.restart_timeout
, &restart
->t_kill
);
418 restart
->what
= cmdtype
;
424 /* Calculate the new restart interval. */
425 if (update_interval
) {
426 if (delay
.tv_sec
> 2 * gs
.max_restart_interval
)
427 restart
->interval
= gs
.min_restart_interval
;
428 else if ((restart
->interval
*= 2) > gs
.max_restart_interval
)
429 restart
->interval
= gs
.max_restart_interval
;
430 if (gs
.loglevel
> LOG_DEBUG
+ 1)
431 zlog_debug("restart %s interval is now %ld",
432 restart
->name
, restart
->interval
);
437 #define SET_READ_HANDLER(DMN) \
439 (DMN)->t_read = NULL; \
440 thread_add_read(master, handle_read, (DMN), (DMN)->fd, \
444 #define SET_WAKEUP_DOWN(DMN) \
446 (DMN)->t_wakeup = NULL; \
447 thread_add_timer_msec(master, wakeup_down, (DMN), \
448 FUZZY(gs.period), &(DMN)->t_wakeup); \
451 #define SET_WAKEUP_UNRESPONSIVE(DMN) \
453 (DMN)->t_wakeup = NULL; \
454 thread_add_timer_msec(master, wakeup_unresponsive, (DMN), \
455 FUZZY(gs.period), &(DMN)->t_wakeup); \
458 #define SET_WAKEUP_ECHO(DMN) \
460 (DMN)->t_wakeup = NULL; \
461 thread_add_timer_msec(master, wakeup_send_echo, (DMN), \
462 FUZZY(gs.period), &(DMN)->t_wakeup); \
465 static int wakeup_down(struct thread
*t_wakeup
)
467 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
469 dmn
->t_wakeup
= NULL
;
470 if (try_connect(dmn
) < 0)
471 SET_WAKEUP_DOWN(dmn
);
472 if ((dmn
->connect_tries
> 1) && (dmn
->state
!= DAEMON_UP
))
477 static int wakeup_init(struct thread
*t_wakeup
)
479 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
481 dmn
->t_wakeup
= NULL
;
482 if (try_connect(dmn
) < 0) {
483 SET_WAKEUP_DOWN(dmn
);
484 zlog_err("%s state -> down : initial connection attempt failed",
486 dmn
->state
= DAEMON_DOWN
;
491 static void daemon_down(struct daemon
*dmn
, const char *why
)
493 if (IS_UP(dmn
) || (dmn
->state
== DAEMON_INIT
))
494 zlog_err("%s state -> down : %s", dmn
->name
, why
);
495 else if (gs
.loglevel
> LOG_DEBUG
)
496 zlog_debug("%s still down : %s", dmn
->name
, why
);
499 dmn
->state
= DAEMON_DOWN
;
504 THREAD_OFF(dmn
->t_read
);
505 THREAD_OFF(dmn
->t_write
);
506 THREAD_OFF(dmn
->t_wakeup
);
507 if (try_connect(dmn
) < 0)
508 SET_WAKEUP_DOWN(dmn
);
512 static int handle_read(struct thread
*t_read
)
514 struct daemon
*dmn
= THREAD_ARG(t_read
);
515 static const char resp
[sizeof(PING_TOKEN
) + 4] = PING_TOKEN
"\n";
516 char buf
[sizeof(resp
) + 100];
518 struct timeval delay
;
521 if ((rc
= read(dmn
->fd
, buf
, sizeof(buf
))) < 0) {
524 if (ERRNO_IO_RETRY(errno
)) {
525 /* Pretend it never happened. */
526 SET_READ_HANDLER(dmn
);
529 snprintf(why
, sizeof(why
), "unexpected read error: %s",
530 safe_strerror(errno
));
531 daemon_down(dmn
, why
);
535 daemon_down(dmn
, "read returned EOF");
538 if (!dmn
->echo_sent
.tv_sec
) {
539 char why
[sizeof(buf
) + 100];
540 snprintf(why
, sizeof(why
),
541 "unexpected read returns %d bytes: %.*s", (int)rc
,
543 daemon_down(dmn
, why
);
547 /* We are expecting an echo response: is there any chance that the
548 response would not be returned entirely in the first read? That
549 seems inconceivable... */
550 if ((rc
!= sizeof(resp
)) || memcmp(buf
, resp
, sizeof(resp
))) {
551 char why
[100 + sizeof(buf
)];
552 snprintf(why
, sizeof(why
),
553 "read returned bad echo response of %d bytes "
554 "(expecting %u): %.*s",
555 (int)rc
, (u_int
)sizeof(resp
), (int)rc
, buf
);
556 daemon_down(dmn
, why
);
560 time_elapsed(&delay
, &dmn
->echo_sent
);
561 dmn
->echo_sent
.tv_sec
= 0;
562 if (dmn
->state
== DAEMON_UNRESPONSIVE
) {
563 if (delay
.tv_sec
< gs
.timeout
) {
564 dmn
->state
= DAEMON_UP
;
566 "%s state -> up : echo response received after %ld.%06ld "
568 dmn
->name
, (long)delay
.tv_sec
,
569 (long)delay
.tv_usec
);
572 "%s: slow echo response finally received after %ld.%06ld "
574 dmn
->name
, (long)delay
.tv_sec
,
575 (long)delay
.tv_usec
);
576 } else if (gs
.loglevel
> LOG_DEBUG
+ 1)
577 zlog_debug("%s: echo response received after %ld.%06ld seconds",
578 dmn
->name
, (long)delay
.tv_sec
, (long)delay
.tv_usec
);
580 SET_READ_HANDLER(dmn
);
582 thread_cancel(dmn
->t_wakeup
);
583 SET_WAKEUP_ECHO(dmn
);
589 * Wait till we notice that all daemons are ready before
590 * we send we are ready to systemd
592 static void daemon_send_ready(void)
595 if (!sent
&& gs
.numdown
== 0) {
598 fp
= fopen(DAEMON_VTY_DIR
"/watchfrr.started", "w");
601 "Watchfrr: Notifying Systemd we are up and running");
602 systemd_send_started(master
, 0);
607 static void daemon_up(struct daemon
*dmn
, const char *why
)
609 dmn
->state
= DAEMON_UP
;
611 dmn
->connect_tries
= 0;
612 zlog_notice("%s state -> up : %s", dmn
->name
, why
);
614 SET_WAKEUP_ECHO(dmn
);
618 static int check_connect(struct thread
*t_write
)
620 struct daemon
*dmn
= THREAD_ARG(t_write
);
622 socklen_t reslen
= sizeof(sockerr
);
625 if (getsockopt(dmn
->fd
, SOL_SOCKET
, SO_ERROR
, (char *)&sockerr
, &reslen
)
627 zlog_warn("%s: check_connect: getsockopt failed: %s", dmn
->name
,
628 safe_strerror(errno
));
630 "getsockopt failed checking connection success");
633 if ((reslen
== sizeof(sockerr
)) && sockerr
) {
637 "getsockopt reports that connection attempt failed: %s",
638 safe_strerror(sockerr
));
639 daemon_down(dmn
, why
);
643 daemon_up(dmn
, "delayed connect succeeded");
647 static int wakeup_connect_hanging(struct thread
*t_wakeup
)
649 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
652 dmn
->t_wakeup
= NULL
;
653 snprintf(why
, sizeof(why
),
654 "connection attempt timed out after %ld seconds", gs
.timeout
);
655 daemon_down(dmn
, why
);
659 /* Making connection to protocol daemon. */
660 static int try_connect(struct daemon
*dmn
)
663 struct sockaddr_un addr
;
666 if (gs
.loglevel
> LOG_DEBUG
+ 1)
667 zlog_debug("%s: attempting to connect", dmn
->name
);
668 dmn
->connect_tries
++;
670 memset(&addr
, 0, sizeof(struct sockaddr_un
));
671 addr
.sun_family
= AF_UNIX
;
672 snprintf(addr
.sun_path
, sizeof(addr
.sun_path
), "%s/%s.vty", gs
.vtydir
,
674 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
675 len
= addr
.sun_len
= SUN_LEN(&addr
);
677 len
= sizeof(addr
.sun_family
) + strlen(addr
.sun_path
);
678 #endif /* HAVE_STRUCT_SOCKADDR_UN_SUN_LEN */
680 /* Quick check to see if we might succeed before we go to the trouble
681 of creating a socket. */
682 if (access(addr
.sun_path
, W_OK
) < 0) {
684 zlog_err("%s: access to socket %s denied: %s",
685 dmn
->name
, addr
.sun_path
,
686 safe_strerror(errno
));
690 if ((sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
691 zlog_err("%s(%s): cannot make socket: %s", __func__
,
692 addr
.sun_path
, safe_strerror(errno
));
696 if (set_nonblocking(sock
) < 0 || set_cloexec(sock
) < 0) {
697 zlog_err("%s(%s): set_nonblocking/cloexec(%d) failed", __func__
,
698 addr
.sun_path
, sock
);
703 if (connect(sock
, (struct sockaddr
*)&addr
, len
) < 0) {
704 if ((errno
!= EINPROGRESS
) && (errno
!= EWOULDBLOCK
)) {
705 if (gs
.loglevel
> LOG_DEBUG
)
706 zlog_debug("%s(%s): connect failed: %s",
707 __func__
, addr
.sun_path
,
708 safe_strerror(errno
));
712 if (gs
.loglevel
> LOG_DEBUG
)
713 zlog_debug("%s: connection in progress", dmn
->name
);
714 dmn
->state
= DAEMON_CONNECTING
;
717 thread_add_write(master
, check_connect
, dmn
, dmn
->fd
,
719 dmn
->t_wakeup
= NULL
;
720 thread_add_timer(master
, wakeup_connect_hanging
, dmn
,
721 gs
.timeout
, &dmn
->t_wakeup
);
722 SET_READ_HANDLER(dmn
);
727 SET_READ_HANDLER(dmn
);
728 daemon_up(dmn
, "connect succeeded");
732 static int phase_hanging(struct thread
*t_hanging
)
734 gs
.t_phase_hanging
= NULL
;
735 zlog_err("Phase [%s] hanging for %ld seconds, aborting phased restart",
736 phase_str
[gs
.phase
], PHASE_TIMEOUT
);
737 gs
.phase
= PHASE_NONE
;
741 static void set_phase(restart_phase_t new_phase
)
743 gs
.phase
= new_phase
;
744 if (gs
.t_phase_hanging
)
745 thread_cancel(gs
.t_phase_hanging
);
746 gs
.t_phase_hanging
= NULL
;
747 thread_add_timer(master
, phase_hanging
, NULL
, PHASE_TIMEOUT
,
748 &gs
.t_phase_hanging
);
751 static void phase_check(void)
756 case PHASE_STOPS_PENDING
:
760 "Phased restart: all routing daemon stop jobs have completed.");
761 set_phase(PHASE_WAITING_DOWN
);
764 case PHASE_WAITING_DOWN
:
765 if (gs
.numdown
+ IS_UP(gs
.special
) < gs
.numdaemons
)
767 zlog_info("Phased restart: all routing daemons now down.");
768 run_job(&gs
.special
->restart
, "restart", gs
.restart_command
, 1,
770 set_phase(PHASE_ZEBRA_RESTART_PENDING
);
773 case PHASE_ZEBRA_RESTART_PENDING
:
774 if (gs
.special
->restart
.pid
)
776 zlog_info("Phased restart: %s restart job completed.",
778 set_phase(PHASE_WAITING_ZEBRA_UP
);
781 case PHASE_WAITING_ZEBRA_UP
:
782 if (!IS_UP(gs
.special
))
784 zlog_info("Phased restart: %s is now up.", gs
.special
->name
);
787 for (dmn
= gs
.daemons
; dmn
; dmn
= dmn
->next
) {
788 if (dmn
!= gs
.special
)
789 run_job(&dmn
->restart
, "start",
790 gs
.start_command
, 1, 0);
793 gs
.phase
= PHASE_NONE
;
794 THREAD_OFF(gs
.t_phase_hanging
);
795 zlog_notice("Phased global restart has completed.");
800 static void try_restart(struct daemon
*dmn
)
805 if (dmn
!= gs
.special
) {
806 if ((gs
.special
->state
== DAEMON_UP
)
807 && (gs
.phase
== PHASE_NONE
))
808 run_job(&dmn
->restart
, "restart", gs
.restart_command
, 0,
812 "%s: postponing restart attempt because master %s daemon "
813 "not up [%s], or phased restart in progress",
814 dmn
->name
, gs
.special
->name
,
815 state_str
[gs
.special
->state
]);
819 if ((gs
.phase
!= PHASE_NONE
) || gs
.numpids
) {
820 if (gs
.loglevel
> LOG_DEBUG
+ 1)
822 "postponing phased global restart: restart already in "
823 "progress [%s], or outstanding child processes [%d]",
824 phase_str
[gs
.phase
], gs
.numpids
);
827 /* Is it too soon for a restart? */
829 struct timeval delay
;
830 if (time_elapsed(&delay
, &gs
.special
->restart
.time
)->tv_sec
831 < gs
.special
->restart
.interval
) {
832 if (gs
.loglevel
> LOG_DEBUG
+ 1)
834 "postponing phased global restart: "
835 "elapsed time %ld < retry interval %ld",
837 gs
.special
->restart
.interval
);
841 run_job(&gs
.restart
, "restart", gs
.restart_command
, 0, 1);
844 static int wakeup_unresponsive(struct thread
*t_wakeup
)
846 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
848 dmn
->t_wakeup
= NULL
;
849 if (dmn
->state
!= DAEMON_UNRESPONSIVE
)
851 "%s: no longer unresponsive (now %s), "
852 "wakeup should have been cancelled!",
853 dmn
->name
, state_str
[dmn
->state
]);
855 SET_WAKEUP_UNRESPONSIVE(dmn
);
861 static int wakeup_no_answer(struct thread
*t_wakeup
)
863 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
865 dmn
->t_wakeup
= NULL
;
866 dmn
->state
= DAEMON_UNRESPONSIVE
;
868 "%s state -> unresponsive : no response yet to ping "
869 "sent %ld seconds ago",
870 dmn
->name
, gs
.timeout
);
871 SET_WAKEUP_UNRESPONSIVE(dmn
);
876 static int wakeup_send_echo(struct thread
*t_wakeup
)
878 static const char echocmd
[] = "echo " PING_TOKEN
;
880 struct daemon
*dmn
= THREAD_ARG(t_wakeup
);
882 dmn
->t_wakeup
= NULL
;
883 if (((rc
= write(dmn
->fd
, echocmd
, sizeof(echocmd
))) < 0)
884 || ((size_t)rc
!= sizeof(echocmd
))) {
885 char why
[100 + sizeof(echocmd
)];
886 snprintf(why
, sizeof(why
),
887 "write '%s' returned %d instead of %u", echocmd
,
888 (int)rc
, (u_int
)sizeof(echocmd
));
889 daemon_down(dmn
, why
);
891 gettimeofday(&dmn
->echo_sent
, NULL
);
892 dmn
->t_wakeup
= NULL
;
893 thread_add_timer(master
, wakeup_no_answer
, dmn
, gs
.timeout
,
899 static void sigint(void)
901 zlog_notice("Terminating on signal");
902 systemd_send_stopping();
906 static int valid_command(const char *cmd
)
910 return ((p
= strchr(cmd
, '%')) != NULL
) && (*(p
+ 1) == 's')
911 && !strchr(p
+ 1, '%');
914 /* This is an ugly hack to circumvent problems with passing command-line
915 arguments that contain spaces. The fix is to use a configuration file. */
916 static char *translate_blanks(const char *cmd
, const char *blankstr
)
920 size_t bslen
= strlen(blankstr
);
922 if (!(res
= strdup(cmd
))) {
926 while ((p
= strstr(res
, blankstr
)) != NULL
) {
929 memmove(p
+ 1, p
+ bslen
, strlen(p
+ bslen
) + 1);
934 struct zebra_privs_t watchfrr_privs
= {
936 .vty_group
= VTY_GROUP
,
940 static struct quagga_signal_t watchfrr_signals
[] = {
955 FRR_DAEMON_INFO(watchfrr
, WATCHFRR
,
956 .flags
= FRR_NO_PRIVSEP
| FRR_NO_TCPVTY
| FRR_LIMITED_CLI
957 | FRR_NO_CFG_PID_DRY
| FRR_NO_ZCLIENT
,
959 .printhelp
= printhelp
,
960 .copyright
= "Copyright 2004 Andrew J. Schorr",
962 .signals
= watchfrr_signals
,
963 .n_signals
= array_size(watchfrr_signals
),
965 .privs
= &watchfrr_privs
, )
967 int main(int argc
, char **argv
)
970 const char *pidfile
= pidfile_default
;
971 const char *special
= "zebra";
972 const char *blankstr
= NULL
;
974 snprintf(pidfile_default
, sizeof(pidfile_default
), "%s/watchfrr.pid",
977 frr_preinit(&watchfrr_di
, argc
, argv
);
978 progname
= watchfrr_di
.progname
;
980 frr_opt_add("b:dk:l:i:p:r:S:s:t:T:", longopts
, "");
982 gs
.restart
.name
= "all";
983 while ((opt
= frr_getopt(argc
, argv
, NULL
)) != EOF
) {
994 if (!valid_command(optarg
)) {
996 "Invalid kill command, must contain '%%s': %s\n",
1000 gs
.stop_command
= optarg
;
1004 if ((sscanf(optarg
, "%d%1s", &gs
.loglevel
, garbage
)
1006 || (gs
.loglevel
< LOG_EMERG
)) {
1008 "Invalid loglevel argument: %s\n",
1013 case OPTION_MINRESTART
: {
1015 if ((sscanf(optarg
, "%ld%1s", &gs
.min_restart_interval
,
1018 || (gs
.min_restart_interval
< 0)) {
1020 "Invalid min_restart_interval argument: %s\n",
1025 case OPTION_MAXRESTART
: {
1027 if ((sscanf(optarg
, "%ld%1s", &gs
.max_restart_interval
,
1030 || (gs
.max_restart_interval
< 0)) {
1032 "Invalid max_restart_interval argument: %s\n",
1040 if ((sscanf(optarg
, "%d%1s", &period
, garbage
) != 1)
1041 || (gs
.period
< 1)) {
1043 "Invalid interval argument: %s\n",
1047 gs
.period
= 1000 * period
;
1053 if (!valid_command(optarg
)) {
1055 "Invalid restart command, must contain '%%s': %s\n",
1059 gs
.restart_command
= optarg
;
1062 if (!valid_command(optarg
)) {
1064 "Invalid start command, must contain '%%s': %s\n",
1068 gs
.start_command
= optarg
;
1075 if ((sscanf(optarg
, "%ld%1s", &gs
.timeout
, garbage
)
1077 || (gs
.timeout
< 1)) {
1079 "Invalid timeout argument: %s\n",
1086 if ((sscanf(optarg
, "%ld%1s", &gs
.restart_timeout
,
1089 || (gs
.restart_timeout
< 1)) {
1091 "Invalid restart timeout argument: %s\n",
1097 fputs("Invalid option.\n", stderr
);
1103 && (gs
.start_command
|| gs
.stop_command
|| gs
.restart_command
)) {
1104 fputs("Options -r/-s/-k are not used when --dry is active.\n",
1108 && (!gs
.restart_command
|| !gs
.start_command
|| !gs
.stop_command
)) {
1110 "Options -s (start), -k (kill), and -r (restart) are required.\n");
1115 if (gs
.restart_command
)
1116 gs
.restart_command
=
1117 translate_blanks(gs
.restart_command
, blankstr
);
1118 if (gs
.start_command
)
1120 translate_blanks(gs
.start_command
, blankstr
);
1121 if (gs
.stop_command
)
1123 translate_blanks(gs
.stop_command
, blankstr
);
1126 gs
.restart
.interval
= gs
.min_restart_interval
;
1128 master
= frr_init();
1130 zlog_set_level(ZLOG_DEST_MONITOR
, ZLOG_DISABLED
);
1131 if (watchfrr_di
.daemon_mode
) {
1132 zlog_set_level(ZLOG_DEST_SYSLOG
, MIN(gs
.loglevel
, LOG_DEBUG
));
1133 if (daemon(0, 0) < 0) {
1134 fprintf(stderr
, "Watchfrr daemon failed: %s",
1139 zlog_set_level(ZLOG_DEST_STDOUT
, MIN(gs
.loglevel
, LOG_DEBUG
));
1141 watchfrr_vty_init();
1147 struct daemon
*tail
= NULL
;
1149 for (i
= optind
; i
< argc
; i
++) {
1152 if (!(dmn
= (struct daemon
*)calloc(1, sizeof(*dmn
)))) {
1153 fprintf(stderr
, "calloc(1,%u) failed: %s\n",
1154 (u_int
)sizeof(*dmn
),
1155 safe_strerror(errno
));
1158 dmn
->name
= dmn
->restart
.name
= argv
[i
];
1159 dmn
->state
= DAEMON_INIT
;
1163 dmn
->t_wakeup
= NULL
;
1164 thread_add_timer_msec(master
, wakeup_init
, dmn
,
1165 100 + (random() % 900),
1167 dmn
->restart
.interval
= gs
.min_restart_interval
;
1174 if (!strcmp(dmn
->name
, special
))
1179 fputs("Must specify one or more daemons to monitor.\n", stderr
);
1182 if (!watch_only
&& !gs
.special
) {
1183 fprintf(stderr
, "\"%s\" daemon must be in daemon list\n",
1188 /* Make sure we're not already running. */
1189 pid_output(pidfile
);
1191 /* Announce which daemons are being monitored. */
1196 for (dmn
= gs
.daemons
; dmn
; dmn
= dmn
->next
)
1197 len
+= strlen(dmn
->name
) + 1;
1203 for (dmn
= gs
.daemons
; dmn
; dmn
= dmn
->next
) {
1206 strcpy(p
, dmn
->name
);
1209 zlog_notice("%s %s watching [%s]%s", progname
,
1211 watch_only
? ", monitor mode" : "");
1216 struct thread thread
;
1218 while (thread_fetch(master
, &thread
))
1219 thread_call(&thread
);
1222 systemd_send_stopping();