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Commit | Line | Data |
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da8f8bbc DM |
1 | #include <stdio.h> |
2 | #include <stdlib.h> | |
3 | #include <unistd.h> | |
4 | #include <fcntl.h> | |
5 | #include <string.h> | |
1fe42db7 | 6 | #include <errno.h> |
98099e4f | 7 | #include <time.h> |
da8f8bbc | 8 | #include <sys/ioctl.h> |
7336614a DM |
9 | #include <sys/types.h> |
10 | #include <sys/stat.h> | |
da8f8bbc DM |
11 | #include <sys/socket.h> |
12 | #include <sys/un.h> | |
13 | #include <sys/epoll.h> | |
98099e4f DM |
14 | #include <signal.h> |
15 | #include <sys/signalfd.h> | |
da8f8bbc DM |
16 | |
17 | #include <linux/types.h> | |
18 | #include <linux/watchdog.h> | |
19 | ||
7336614a | 20 | #include <systemd/sd-daemon.h> |
e99d3682 | 21 | |
ba878e35 | 22 | #define MY_SOCK_PATH "/run/watchdog-mux.sock" |
98099e4f DM |
23 | #define WD_ACTIVE_MARKER "/run/watchdog-mux.active" |
24 | ||
da8f8bbc DM |
25 | #define LISTEN_BACKLOG 50 |
26 | #define MAX_EVENTS 10 | |
27 | ||
28 | #define WATCHDOG_DEV "/dev/watchdog" | |
29 | ||
30 | int watchdog_fd = -1; | |
31 | int watchdog_timeout = 20; | |
32 | ||
4915a0e9 DM |
33 | |
34 | typedef struct { | |
35 | int fd; | |
98099e4f | 36 | time_t time; |
4915a0e9 DM |
37 | } wd_client_t; |
38 | ||
39 | #define MAX_CLIENTS 100 | |
40 | ||
41 | static wd_client_t client_list[MAX_CLIENTS]; | |
42 | ||
43 | static wd_client_t * | |
98099e4f | 44 | alloc_client(int fd, time_t time) |
4915a0e9 DM |
45 | { |
46 | int i; | |
47 | ||
48 | for (i = 0; i < MAX_CLIENTS; i++) { | |
49 | if (client_list[i].fd == 0) { | |
4915a0e9 | 50 | client_list[i].fd = fd; |
98099e4f | 51 | client_list[i].time = time; |
4915a0e9 DM |
52 | return &client_list[i]; |
53 | } | |
54 | } | |
55 | ||
56 | return NULL; | |
57 | } | |
58 | ||
59 | static void | |
60 | free_client(wd_client_t *wd_client) | |
61 | { | |
62 | if (!wd_client) | |
63 | return; | |
64 | ||
98099e4f | 65 | wd_client->time = 0; |
4915a0e9 DM |
66 | wd_client->fd = 0; |
67 | } | |
68 | ||
98099e4f DM |
69 | static int |
70 | active_client_count(void) | |
71 | { | |
72 | int i, count = 0; | |
73 | ||
74 | for (i = 0; i < MAX_CLIENTS; i++) { | |
75 | if (client_list[i].fd != 0 && client_list[i].time != 0) { | |
76 | count++; | |
77 | } | |
78 | } | |
79 | ||
80 | return count; | |
81 | } | |
82 | ||
da8f8bbc DM |
83 | static void |
84 | watchdog_close(void) | |
85 | { | |
86 | if (watchdog_fd != -1) { | |
87 | if (write(watchdog_fd, "V", 1) == -1) { | |
88 | perror("write magic watchdog close"); | |
89 | } | |
90 | if (close(watchdog_fd) == -1) { | |
91 | perror("write magic watchdog close"); | |
92 | } | |
93 | } | |
94 | ||
95 | watchdog_fd = -1; | |
96 | } | |
97 | ||
98 | int | |
99 | main(void) | |
100 | { | |
da8f8bbc DM |
101 | struct sockaddr_un my_addr, peer_addr; |
102 | socklen_t peer_addr_size; | |
103 | struct epoll_event ev, events[MAX_EVENTS]; | |
98099e4f | 104 | int socket_count, listen_sock, nfds, epollfd, sigfd; |
da8f8bbc | 105 | |
98099e4f | 106 | |
da8f8bbc | 107 | struct stat fs; |
98099e4f DM |
108 | |
109 | if (stat(WD_ACTIVE_MARKER, &fs) == 0) { | |
110 | fprintf(stderr, "watchdog active - unable to restart watchdog-mux\n"); | |
111 | exit(EXIT_FAILURE); | |
112 | } | |
113 | ||
da8f8bbc DM |
114 | if (stat(WATCHDOG_DEV, &fs) == -1) { |
115 | system("modprobe -q softdog soft_noboot=1"); // fixme | |
116 | } | |
117 | ||
118 | if ((watchdog_fd = open(WATCHDOG_DEV, O_WRONLY)) == -1) { | |
119 | perror("watchdog open"); | |
120 | exit(EXIT_FAILURE); | |
121 | } | |
122 | ||
123 | if (ioctl(watchdog_fd, WDIOC_SETTIMEOUT, &watchdog_timeout) == -1) { | |
124 | perror("watchdog set timeout"); | |
125 | watchdog_close(); | |
126 | exit(EXIT_FAILURE); | |
127 | } | |
128 | ||
129 | /* read and log watchdog identity */ | |
130 | struct watchdog_info wdinfo; | |
131 | if (ioctl(watchdog_fd, WDIOC_GETSUPPORT, &wdinfo) == -1) { | |
132 | perror("read watchdog info"); | |
133 | watchdog_close(); | |
134 | exit(EXIT_FAILURE); | |
135 | } | |
136 | ||
137 | wdinfo.identity[sizeof(wdinfo.identity) - 1] = 0; // just to be sure | |
138 | fprintf(stderr, "Watchdog driver '%s', version %x\n", | |
139 | wdinfo.identity, wdinfo.firmware_version); | |
140 | ||
e99d3682 | 141 | socket_count = sd_listen_fds(0); |
da8f8bbc | 142 | |
e99d3682 | 143 | if (socket_count > 1) { |
da8f8bbc | 144 | |
ba878e35 | 145 | perror("too many file descriptors received.\n"); |
e99d3682 DM |
146 | goto err; |
147 | ||
148 | } else if (socket_count == 1) { | |
da8f8bbc | 149 | |
e99d3682 DM |
150 | listen_sock = SD_LISTEN_FDS_START + 0; |
151 | ||
152 | } else { | |
da8f8bbc | 153 | |
e99d3682 DM |
154 | unlink(MY_SOCK_PATH); |
155 | ||
156 | listen_sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
157 | if (listen_sock == -1) { | |
158 | perror("socket create"); | |
159 | exit(EXIT_FAILURE); | |
160 | } | |
161 | ||
162 | memset(&my_addr, 0, sizeof(struct sockaddr_un)); | |
163 | my_addr.sun_family = AF_UNIX; | |
164 | strncpy(my_addr.sun_path, MY_SOCK_PATH, sizeof(my_addr.sun_path) - 1); | |
165 | ||
166 | if (bind(listen_sock, (struct sockaddr *) &my_addr, | |
167 | sizeof(struct sockaddr_un)) == -1) { | |
168 | perror("socket bind"); | |
169 | exit(EXIT_FAILURE); | |
170 | } | |
da8f8bbc | 171 | |
e99d3682 DM |
172 | if (listen(listen_sock, LISTEN_BACKLOG) == -1) { |
173 | perror("socket listen"); | |
174 | goto err; | |
175 | } | |
da8f8bbc | 176 | } |
e99d3682 | 177 | |
da8f8bbc DM |
178 | epollfd = epoll_create(10); |
179 | if (epollfd == -1) { | |
180 | perror("epoll_create"); | |
181 | goto err; | |
182 | } | |
183 | ||
184 | ev.events = EPOLLIN; | |
98099e4f | 185 | ev.data.ptr = alloc_client(listen_sock, 0); |
da8f8bbc | 186 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, listen_sock, &ev) == -1) { |
98099e4f DM |
187 | perror("epoll_ctl add listen_sock"); |
188 | goto err; | |
189 | } | |
190 | ||
191 | sigset_t mask; | |
192 | sigemptyset(&mask); | |
193 | sigaddset(&mask, SIGINT); | |
194 | sigaddset(&mask, SIGTERM); | |
195 | sigaddset(&mask, SIGHUP); | |
196 | ||
197 | sigprocmask(SIG_BLOCK, &mask, NULL); | |
198 | ||
199 | if ((sigfd = signalfd(-1, &mask, SFD_NONBLOCK)) < 0) { | |
200 | perror("unable to open signalfd"); | |
da8f8bbc DM |
201 | goto err; |
202 | } | |
203 | ||
98099e4f DM |
204 | ev.events = EPOLLIN; |
205 | ev.data.ptr = alloc_client(sigfd, 0); | |
206 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, sigfd, &ev) == -1) { | |
207 | perror("epoll_ctl add sigfd"); | |
208 | goto err; | |
209 | } | |
210 | ||
da8f8bbc | 211 | for (;;) { |
1fe42db7 | 212 | nfds = epoll_wait(epollfd, events, MAX_EVENTS, 1000); |
da8f8bbc | 213 | if (nfds == -1) { |
1fe42db7 DM |
214 | if (errno == EINTR) |
215 | continue; | |
216 | ||
da8f8bbc DM |
217 | perror("epoll_pwait"); |
218 | goto err; | |
219 | } | |
220 | ||
1fe42db7 DM |
221 | if (nfds == 0) { // timeout |
222 | ||
223 | if (ioctl(watchdog_fd, WDIOC_KEEPALIVE, 0) == -1) { | |
224 | perror("watchdog update failed"); | |
225 | } | |
226 | ||
227 | continue; | |
228 | } | |
229 | ||
98099e4f DM |
230 | int terminate = 0; |
231 | ||
da8f8bbc DM |
232 | int n; |
233 | for (n = 0; n < nfds; ++n) { | |
4915a0e9 DM |
234 | wd_client_t *wd_client = events[n].data.ptr; |
235 | if (wd_client->fd == listen_sock) { | |
da8f8bbc DM |
236 | int conn_sock = accept(listen_sock, (struct sockaddr *) &peer_addr, &peer_addr_size); |
237 | if (conn_sock == -1) { | |
238 | perror("accept"); | |
239 | goto err; // fixme | |
240 | } | |
241 | if (fcntl(conn_sock, F_SETFL, O_NONBLOCK) == -1) { | |
242 | perror("setnonblocking"); | |
243 | goto err; // fixme | |
244 | } | |
245 | ||
98099e4f | 246 | wd_client_t *new_client = alloc_client(conn_sock, time(NULL)); |
4915a0e9 DM |
247 | if (new_client == NULL) { |
248 | fprintf(stderr, "unable to alloc wd_client structure\n"); | |
249 | goto err; // fixme; | |
250 | } | |
98099e4f DM |
251 | |
252 | mkdir(WD_ACTIVE_MARKER, 0600); | |
253 | ||
da8f8bbc | 254 | ev.events = EPOLLIN; |
4915a0e9 | 255 | ev.data.ptr = new_client; |
da8f8bbc DM |
256 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, conn_sock, &ev) == -1) { |
257 | perror("epoll_ctl: add conn_sock"); | |
258 | goto err; // fixme | |
259 | } | |
98099e4f DM |
260 | } else if (wd_client->fd == sigfd) { |
261 | ||
262 | /* signal handling */ | |
263 | ||
264 | int rv = 0; | |
265 | struct signalfd_siginfo si; | |
266 | ||
267 | if ((rv = read(sigfd, &si, sizeof(si))) && rv >= 0) { | |
268 | if (si.ssi_signo == SIGHUP) { | |
269 | perror("got SIGHUP - ignored"); | |
270 | } else { | |
271 | terminate = 1; | |
272 | fprintf(stderr, "got terminate request\n"); | |
273 | } | |
274 | } | |
275 | ||
da8f8bbc DM |
276 | } else { |
277 | char buf[4096]; | |
4915a0e9 | 278 | int cfd = wd_client->fd; |
98099e4f | 279 | |
da8f8bbc DM |
280 | ssize_t bytes = read(cfd, buf, sizeof(buf)); |
281 | if (bytes == -1) { | |
282 | perror("read"); | |
283 | goto err; // fixme | |
284 | } else if (bytes > 0) { | |
4915a0e9 | 285 | fprintf(stderr, "GOT %zd bytes\n", bytes); |
da8f8bbc DM |
286 | } else { |
287 | if (events[n].events & EPOLLHUP || events[n].events & EPOLLERR) { | |
288 | printf("GOT %016x event\n", events[n].events); | |
289 | if (epoll_ctl(epollfd, EPOLL_CTL_DEL, cfd, NULL) == -1) { | |
290 | perror("epoll_ctl: del conn_sock"); | |
291 | goto err; // fixme | |
292 | } | |
293 | if (close(cfd) == -1) { | |
294 | perror("close conn_sock"); | |
295 | goto err; // fixme | |
296 | } | |
4915a0e9 DM |
297 | fprintf(stderr, "close client connection\n"); |
298 | free_client(wd_client); | |
98099e4f DM |
299 | |
300 | if (!active_client_count()) { | |
301 | rmdir(WD_ACTIVE_MARKER); | |
302 | } | |
da8f8bbc DM |
303 | } |
304 | } | |
305 | } | |
306 | } | |
98099e4f DM |
307 | if (terminate) |
308 | break; | |
da8f8bbc DM |
309 | } |
310 | ||
98099e4f DM |
311 | int active_count = active_client_count(); |
312 | if (active_count > 0) { | |
313 | fprintf(stderr, "exit watchdog-mux with active connections\n"); | |
314 | } else { | |
315 | fprintf(stderr, "clean exit\n"); | |
316 | watchdog_close(); | |
317 | } | |
318 | ||
da8f8bbc DM |
319 | unlink(MY_SOCK_PATH); |
320 | exit(EXIT_SUCCESS); | |
321 | ||
322 | err: | |
323 | unlink(MY_SOCK_PATH); | |
324 | exit(EXIT_FAILURE); | |
325 | } |