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git.proxmox.com Git - pve-ha-manager.git/blob - src/watchdog-mux.c
11 #include <sys/socket.h>
13 #include <sys/epoll.h>
15 #include <sys/signalfd.h>
17 #include <linux/types.h>
18 #include <linux/watchdog.h>
20 #include <systemd/sd-daemon.h>
22 #define MY_SOCK_PATH "/run/watchdog-mux.sock"
23 #define WD_ACTIVE_MARKER "/run/watchdog-mux.active"
25 #define LISTEN_BACKLOG 50
28 #define WATCHDOG_DEV "/dev/watchdog"
31 int watchdog_timeout
= 10;
32 int client_watchdog_timeout
= 60;
33 int update_watchdog
= 1;
41 #define MAX_CLIENTS 100
43 static wd_client_t client_list
[MAX_CLIENTS
];
46 alloc_client(int fd
, time_t time
)
50 for (i
= 0; i
< MAX_CLIENTS
; i
++) {
51 if (client_list
[i
].fd
== 0) {
52 client_list
[i
].fd
= fd
;
53 client_list
[i
].time
= time
;
54 client_list
[i
].magic_close
= 0;
55 return &client_list
[i
];
63 free_client(wd_client_t
*wd_client
)
70 wd_client
->magic_close
= 0;
74 active_client_count(void)
78 for (i
= 0; i
< MAX_CLIENTS
; i
++) {
79 if (client_list
[i
].fd
!= 0 && client_list
[i
].time
!= 0) {
90 if (watchdog_fd
!= -1) {
91 if (write(watchdog_fd
, "V", 1) == -1) {
92 perror("write magic watchdog close");
94 if (close(watchdog_fd
) == -1) {
95 perror("write magic watchdog close");
105 struct sockaddr_un my_addr
, peer_addr
;
106 socklen_t peer_addr_size
;
107 struct epoll_event ev
, events
[MAX_EVENTS
];
108 int socket_count
, listen_sock
, nfds
, epollfd
, sigfd
;
113 if (stat(WD_ACTIVE_MARKER
, &fs
) == 0) {
114 fprintf(stderr
, "watchdog active - unable to restart watchdog-mux\n");
118 if (stat(WATCHDOG_DEV
, &fs
) == -1) {
119 system("modprobe -q softdog soft_noboot=1"); // fixme
122 if ((watchdog_fd
= open(WATCHDOG_DEV
, O_WRONLY
)) == -1) {
123 perror("watchdog open");
127 if (ioctl(watchdog_fd
, WDIOC_SETTIMEOUT
, &watchdog_timeout
) == -1) {
128 perror("watchdog set timeout");
133 /* read and log watchdog identity */
134 struct watchdog_info wdinfo
;
135 if (ioctl(watchdog_fd
, WDIOC_GETSUPPORT
, &wdinfo
) == -1) {
136 perror("read watchdog info");
141 wdinfo
.identity
[sizeof(wdinfo
.identity
) - 1] = 0; // just to be sure
142 fprintf(stderr
, "Watchdog driver '%s', version %x\n",
143 wdinfo
.identity
, wdinfo
.firmware_version
);
145 socket_count
= sd_listen_fds(0);
147 if (socket_count
> 1) {
149 perror("too many file descriptors received.\n");
152 } else if (socket_count
== 1) {
154 listen_sock
= SD_LISTEN_FDS_START
+ 0;
158 unlink(MY_SOCK_PATH
);
160 listen_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0);
161 if (listen_sock
== -1) {
162 perror("socket create");
166 memset(&my_addr
, 0, sizeof(struct sockaddr_un
));
167 my_addr
.sun_family
= AF_UNIX
;
168 strncpy(my_addr
.sun_path
, MY_SOCK_PATH
, sizeof(my_addr
.sun_path
) - 1);
170 if (bind(listen_sock
, (struct sockaddr
*) &my_addr
,
171 sizeof(struct sockaddr_un
)) == -1) {
172 perror("socket bind");
176 if (listen(listen_sock
, LISTEN_BACKLOG
) == -1) {
177 perror("socket listen");
182 epollfd
= epoll_create(10);
184 perror("epoll_create");
189 ev
.data
.ptr
= alloc_client(listen_sock
, 0);
190 if (epoll_ctl(epollfd
, EPOLL_CTL_ADD
, listen_sock
, &ev
) == -1) {
191 perror("epoll_ctl add listen_sock");
197 sigaddset(&mask
, SIGINT
);
198 sigaddset(&mask
, SIGTERM
);
199 sigaddset(&mask
, SIGHUP
);
201 sigprocmask(SIG_BLOCK
, &mask
, NULL
);
203 if ((sigfd
= signalfd(-1, &mask
, SFD_NONBLOCK
)) < 0) {
204 perror("unable to open signalfd");
209 ev
.data
.ptr
= alloc_client(sigfd
, 0);
210 if (epoll_ctl(epollfd
, EPOLL_CTL_ADD
, sigfd
, &ev
) == -1) {
211 perror("epoll_ctl add sigfd");
216 nfds
= epoll_wait(epollfd
, events
, MAX_EVENTS
, 1000);
221 perror("epoll_pwait");
225 if (nfds
== 0) { // timeout
227 // check for timeouts
228 if (update_watchdog
) {
230 time_t ctime
= time(NULL
);
231 for (i
= 0; i
< MAX_CLIENTS
; i
++) {
232 if (client_list
[i
].fd
!= 0 && client_list
[i
].time
!= 0 &&
233 ((ctime
- client_list
[i
].time
) > client_watchdog_timeout
)) {
235 fprintf(stderr
, "client watchdog expired - disable watchdog updates\n");
240 if (update_watchdog
) {
241 if (ioctl(watchdog_fd
, WDIOC_KEEPALIVE
, 0) == -1) {
242 perror("watchdog update failed");
252 for (n
= 0; n
< nfds
; ++n
) {
253 wd_client_t
*wd_client
= events
[n
].data
.ptr
;
254 if (wd_client
->fd
== listen_sock
) {
255 int conn_sock
= accept(listen_sock
, (struct sockaddr
*) &peer_addr
, &peer_addr_size
);
256 if (conn_sock
== -1) {
260 if (fcntl(conn_sock
, F_SETFL
, O_NONBLOCK
) == -1) {
261 perror("setnonblocking");
265 wd_client_t
*new_client
= alloc_client(conn_sock
, time(NULL
));
266 if (new_client
== NULL
) {
267 fprintf(stderr
, "unable to alloc wd_client structure\n");
271 mkdir(WD_ACTIVE_MARKER
, 0600);
274 ev
.data
.ptr
= new_client
;
275 if (epoll_ctl(epollfd
, EPOLL_CTL_ADD
, conn_sock
, &ev
) == -1) {
276 perror("epoll_ctl: add conn_sock");
279 } else if (wd_client
->fd
== sigfd
) {
281 /* signal handling */
284 struct signalfd_siginfo si
;
286 if ((rv
= read(sigfd
, &si
, sizeof(si
))) && rv
>= 0) {
287 if (si
.ssi_signo
== SIGHUP
) {
288 perror("got SIGHUP - ignored");
291 fprintf(stderr
, "got terminate request\n");
297 int cfd
= wd_client
->fd
;
299 ssize_t bytes
= read(cfd
, buf
, sizeof(buf
));
303 } else if (bytes
> 0) {
305 for (i
= 0; i
< bytes
; i
++) {
307 wd_client
->magic_close
= 1;
309 wd_client
->magic_close
= 0;
312 wd_client
->time
= time(NULL
);
314 if (events
[n
].events
& EPOLLHUP
|| events
[n
].events
& EPOLLERR
) {
315 //printf("GOT %016x event\n", events[n].events);
316 if (epoll_ctl(epollfd
, EPOLL_CTL_DEL
, cfd
, NULL
) == -1) {
317 perror("epoll_ctl: del conn_sock");
320 if (close(cfd
) == -1) {
321 perror("close conn_sock");
325 if (!wd_client
->magic_close
) {
326 fprintf(stderr
, "client did not stop watchdog - disable watchdog updates\n");
329 free_client(wd_client
);
332 if (!active_client_count()) {
333 rmdir(WD_ACTIVE_MARKER
);
343 int active_count
= active_client_count();
344 if (active_count
> 0) {
345 fprintf(stderr
, "exit watchdog-mux with active connections\n");
347 fprintf(stderr
, "clean exit\n");
351 unlink(MY_SOCK_PATH
);
355 unlink(MY_SOCK_PATH
);