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649dbf42 | 1 | // SPDX-License-Identifier: AGPL-3.0-or-later |
4c17b2e3 | 2 | /* |
649dbf42 | 3 | Copyright (C) 2018 - 2021 Proxmox Server Solutions GmbH |
4c17b2e3 DC |
4 | |
5 | Author: Dominik Csapak <d.csapak@proxmox.com> | |
aedf8208 | 6 | Author: Stefan Reiter <s.reiter@proxmox.com> |
4c17b2e3 | 7 | |
aedf8208 | 8 | Description: |
4c17b2e3 | 9 | |
aedf8208 TL |
10 | qmeventd listens on a given socket, and waits for qemu processes to |
11 | connect. After accepting a connection qmeventd waits for shutdown events | |
12 | followed by the closing of the socket. Once that happens `qm cleanup` will | |
13 | be executed with following three arguments: | |
14 | VMID <graceful> <guest> | |
15 | Where `graceful` can be `1` or `0` depending if shutdown event was observed | |
16 | before the socket got closed. The second parameter `guest` is also boolean | |
17 | `1` or `0` depending if the shutdown was requested from the guest OS | |
18 | (i.e., the "inside"). | |
4c17b2e3 DC |
19 | */ |
20 | ||
21 | #ifndef _GNU_SOURCE | |
22 | #define _GNU_SOURCE | |
23 | #endif | |
24 | ||
25 | #include <errno.h> | |
26 | #include <fcntl.h> | |
aedf8208 | 27 | #include <gmodule.h> |
4c17b2e3 DC |
28 | #include <json.h> |
29 | #include <signal.h> | |
30 | #include <stdbool.h> | |
31 | #include <stdio.h> | |
32 | #include <string.h> | |
33 | #include <sys/epoll.h> | |
34 | #include <sys/socket.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/un.h> | |
37 | #include <sys/wait.h> | |
38 | #include <unistd.h> | |
39 | ||
40 | #include "qmeventd.h" | |
41 | ||
42 | static int verbose = 0; | |
43 | static int epoll_fd = 0; | |
44 | static const char *progname; | |
3ff85001 | 45 | GHashTable *vm_clients; // key=vmid (freed on remove), value=*Client (free manually) |
4c500f16 SR |
46 | GSList *forced_cleanups; |
47 | volatile sig_atomic_t alarm_triggered = 0; | |
3ff85001 | 48 | |
4c17b2e3 DC |
49 | /* |
50 | * Helper functions | |
51 | */ | |
52 | ||
53 | static void | |
54 | usage() | |
55 | { | |
56 | fprintf(stderr, "Usage: %s [-f] [-v] PATH\n", progname); | |
57 | fprintf(stderr, " -f run in foreground (default: false)\n"); | |
58 | fprintf(stderr, " -v verbose (default: false)\n"); | |
59 | fprintf(stderr, " PATH use PATH for socket\n"); | |
60 | } | |
61 | ||
62 | static pid_t | |
63 | get_pid_from_fd(int fd) | |
64 | { | |
65 | struct ucred credentials = { .pid = 0, .uid = 0, .gid = 0 }; | |
66 | socklen_t len = sizeof(struct ucred); | |
67 | log_neg(getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &credentials, &len), "getsockopt"); | |
68 | return credentials.pid; | |
69 | } | |
70 | ||
71 | /* | |
72 | * reads the vmid from /proc/<pid>/cmdline | |
73 | * after the '-id' argument | |
74 | */ | |
75 | static unsigned long | |
76 | get_vmid_from_pid(pid_t pid) | |
77 | { | |
78 | char filename[32] = { 0 }; | |
79 | int len = snprintf(filename, sizeof(filename), "/proc/%d/cmdline", pid); | |
80 | if (len < 0) { | |
81 | fprintf(stderr, "error during snprintf for %d: %s\n", pid, | |
82 | strerror(errno)); | |
83 | return 0; | |
84 | } | |
85 | if ((size_t)len >= sizeof(filename)) { | |
86 | fprintf(stderr, "error: pid %d too long\n", pid); | |
87 | return 0; | |
88 | } | |
89 | FILE *fp = fopen(filename, "re"); | |
90 | if (fp == NULL) { | |
91 | fprintf(stderr, "error opening %s: %s\n", filename, strerror(errno)); | |
92 | return 0; | |
93 | } | |
94 | ||
95 | unsigned long vmid = 0; | |
96 | ssize_t rc = 0; | |
97 | char *buf = NULL; | |
98 | size_t buflen = 0; | |
99 | while ((rc = getdelim(&buf, &buflen, '\0', fp)) >= 0) { | |
100 | if (!strcmp(buf, "-id")) { | |
101 | break; | |
102 | } | |
103 | } | |
104 | ||
105 | if (rc < 0) { | |
106 | goto err; | |
107 | } | |
108 | ||
109 | if (getdelim(&buf, &buflen, '\0', fp) >= 0) { | |
110 | if (buf[0] == '-' || buf[0] == '\0') { | |
111 | fprintf(stderr, "invalid vmid %s\n", buf); | |
112 | goto ret; | |
113 | } | |
114 | ||
115 | errno = 0; | |
116 | char *endptr = NULL; | |
117 | vmid = strtoul(buf, &endptr, 10); | |
118 | if (errno != 0) { | |
119 | vmid = 0; | |
120 | goto err; | |
121 | } else if (*endptr != '\0') { | |
122 | fprintf(stderr, "invalid vmid %s\n", buf); | |
123 | vmid = 0; | |
124 | } | |
125 | ||
126 | goto ret; | |
127 | } | |
128 | ||
129 | err: | |
130 | fprintf(stderr, "error parsing vmid for %d: %s\n", pid, strerror(errno)); | |
131 | ||
132 | ret: | |
133 | free(buf); | |
134 | fclose(fp); | |
135 | return vmid; | |
136 | } | |
137 | ||
138 | static bool | |
139 | must_write(int fd, const char *buf, size_t len) | |
140 | { | |
141 | ssize_t wlen; | |
142 | do { | |
143 | wlen = write(fd, buf, len); | |
144 | } while (wlen < 0 && errno == EINTR); | |
145 | ||
146 | return (wlen == (ssize_t)len); | |
147 | } | |
148 | ||
149 | /* | |
150 | * qmp handling functions | |
151 | */ | |
152 | ||
3ff85001 SR |
153 | static void |
154 | send_qmp_cmd(struct Client *client, const char *buf, size_t len) | |
155 | { | |
156 | if (!must_write(client->fd, buf, len - 1)) { | |
157 | fprintf(stderr, "%s: cannot send QMP message\n", client->qemu.vmid); | |
158 | cleanup_client(client); | |
159 | } | |
160 | } | |
161 | ||
4c17b2e3 DC |
162 | void |
163 | handle_qmp_handshake(struct Client *client) | |
164 | { | |
3ff85001 SR |
165 | VERBOSE_PRINT("pid%d: got QMP handshake, assuming QEMU client\n", client->pid); |
166 | ||
167 | // extract vmid from cmdline, now that we know it's a QEMU process | |
168 | unsigned long vmid = get_vmid_from_pid(client->pid); | |
169 | int res = snprintf(client->qemu.vmid, sizeof(client->qemu.vmid), "%lu", vmid); | |
170 | if (vmid == 0 || res < 0 || res >= (int)sizeof(client->qemu.vmid)) { | |
171 | fprintf(stderr, "could not get vmid from pid %d\n", client->pid); | |
4c17b2e3 | 172 | cleanup_client(client); |
3ff85001 SR |
173 | return; |
174 | } | |
175 | ||
176 | VERBOSE_PRINT("pid%d: assigned VMID: %s\n", client->pid, client->qemu.vmid); | |
177 | client->type = CLIENT_QEMU; | |
178 | if(!g_hash_table_insert(vm_clients, strdup(client->qemu.vmid), client)) { | |
179 | // not fatal, just means backup handling won't work | |
180 | fprintf(stderr, "%s: could not insert client into VMID->client table\n", | |
181 | client->qemu.vmid); | |
4c17b2e3 | 182 | } |
3ff85001 SR |
183 | |
184 | static const char qmp_answer[] = "{\"execute\":\"qmp_capabilities\"}\n"; | |
185 | send_qmp_cmd(client, qmp_answer, sizeof(qmp_answer)); | |
4c17b2e3 DC |
186 | } |
187 | ||
188 | void | |
189 | handle_qmp_event(struct Client *client, struct json_object *obj) | |
190 | { | |
191 | struct json_object *event; | |
192 | if (!json_object_object_get_ex(obj, "event", &event)) { | |
193 | return; | |
194 | } | |
a2488e4c | 195 | VERBOSE_PRINT("%s: got QMP event: %s\n", client->qemu.vmid, json_object_get_string(event)); |
3ff85001 SR |
196 | |
197 | if (client->state == STATE_TERMINATING) { | |
198 | // QEMU sometimes sends a second SHUTDOWN after SIGTERM, ignore | |
a2488e4c | 199 | VERBOSE_PRINT("%s: event was after termination, ignoring\n", client->qemu.vmid); |
3ff85001 SR |
200 | return; |
201 | } | |
202 | ||
4c17b2e3 DC |
203 | // event, check if shutdown and get guest parameter |
204 | if (!strcmp(json_object_get_string(event), "SHUTDOWN")) { | |
3ff85001 | 205 | client->qemu.graceful = 1; |
4c17b2e3 DC |
206 | struct json_object *data; |
207 | struct json_object *guest; | |
208 | if (json_object_object_get_ex(obj, "data", &data) && | |
209 | json_object_object_get_ex(data, "guest", &guest)) | |
210 | { | |
3ff85001 | 211 | client->qemu.guest = (unsigned short)json_object_get_boolean(guest); |
4c17b2e3 | 212 | } |
3ff85001 SR |
213 | |
214 | // check if a backup is running and kill QEMU process if not | |
215 | terminate_check(client); | |
216 | } | |
217 | } | |
218 | ||
219 | void | |
220 | terminate_check(struct Client *client) | |
221 | { | |
222 | if (client->state != STATE_IDLE) { | |
223 | // if we're already in a request, queue this one until after | |
224 | VERBOSE_PRINT("%s: terminate_check queued\n", client->qemu.vmid); | |
225 | client->qemu.term_check_queued = true; | |
226 | return; | |
227 | } | |
228 | ||
229 | client->qemu.term_check_queued = false; | |
230 | ||
231 | VERBOSE_PRINT("%s: query-status\n", client->qemu.vmid); | |
232 | client->state = STATE_EXPECT_STATUS_RESP; | |
233 | static const char qmp_req[] = "{\"execute\":\"query-status\"}\n"; | |
234 | send_qmp_cmd(client, qmp_req, sizeof(qmp_req)); | |
235 | } | |
236 | ||
237 | void | |
238 | handle_qmp_return(struct Client *client, struct json_object *data, bool error) | |
239 | { | |
240 | if (error) { | |
241 | const char *msg = "n/a"; | |
242 | struct json_object *desc; | |
243 | if (json_object_object_get_ex(data, "desc", &desc)) { | |
244 | msg = json_object_get_string(desc); | |
245 | } | |
246 | fprintf(stderr, "%s: received error from QMP: %s\n", | |
247 | client->qemu.vmid, msg); | |
248 | client->state = STATE_IDLE; | |
249 | goto out; | |
250 | } | |
251 | ||
252 | struct json_object *status; | |
253 | json_bool has_status = data && | |
254 | json_object_object_get_ex(data, "status", &status); | |
255 | ||
256 | bool active = false; | |
257 | if (has_status) { | |
258 | const char *status_str = json_object_get_string(status); | |
259 | active = status_str && | |
260 | (!strcmp(status_str, "running") || !strcmp(status_str, "paused")); | |
261 | } | |
262 | ||
263 | switch (client->state) { | |
264 | case STATE_EXPECT_STATUS_RESP: | |
265 | client->state = STATE_IDLE; | |
266 | if (active) { | |
267 | VERBOSE_PRINT("%s: got status: VM is active\n", client->qemu.vmid); | |
268 | } else if (!client->qemu.backup) { | |
269 | terminate_client(client); | |
270 | } else { | |
271 | // if we're in a backup, don't do anything, vzdump will notify | |
272 | // us when the backup finishes | |
273 | VERBOSE_PRINT("%s: not active, but running backup - keep alive\n", | |
274 | client->qemu.vmid); | |
275 | } | |
276 | break; | |
277 | ||
278 | // this means we received the empty return from our handshake answer | |
279 | case STATE_HANDSHAKE: | |
280 | client->state = STATE_IDLE; | |
281 | VERBOSE_PRINT("%s: QMP handshake complete\n", client->qemu.vmid); | |
282 | break; | |
283 | ||
284 | case STATE_IDLE: | |
285 | case STATE_TERMINATING: | |
286 | VERBOSE_PRINT("%s: spurious return value received\n", | |
287 | client->qemu.vmid); | |
288 | break; | |
289 | } | |
290 | ||
291 | out: | |
292 | if (client->qemu.term_check_queued) { | |
293 | terminate_check(client); | |
294 | } | |
295 | } | |
296 | ||
297 | /* | |
298 | * VZDump specific client functions | |
299 | */ | |
300 | ||
301 | void | |
302 | handle_vzdump_handshake(struct Client *client, struct json_object *data) | |
303 | { | |
304 | client->state = STATE_IDLE; | |
305 | ||
306 | struct json_object *vmid_obj; | |
307 | json_bool has_vmid = data && json_object_object_get_ex(data, "vmid", &vmid_obj); | |
308 | ||
309 | if (!has_vmid) { | |
42edf948 | 310 | VERBOSE_PRINT("pid%d: invalid vzdump handshake: no vmid\n", client->pid); |
3ff85001 SR |
311 | return; |
312 | } | |
313 | ||
314 | const char *vmid_str = json_object_get_string(vmid_obj); | |
315 | ||
316 | if (!vmid_str) { | |
42edf948 | 317 | VERBOSE_PRINT("pid%d: invalid vzdump handshake: vmid is not a string\n", client->pid); |
3ff85001 SR |
318 | return; |
319 | } | |
320 | ||
321 | int res = snprintf(client->vzdump.vmid, sizeof(client->vzdump.vmid), "%s", vmid_str); | |
322 | if (res < 0 || res >= (int)sizeof(client->vzdump.vmid)) { | |
42edf948 | 323 | VERBOSE_PRINT("pid%d: invalid vzdump handshake: vmid too long or invalid\n", client->pid); |
3ff85001 SR |
324 | return; |
325 | } | |
326 | ||
42edf948 | 327 | struct Client *vmc = (struct Client*) g_hash_table_lookup(vm_clients, client->vzdump.vmid); |
3ff85001 SR |
328 | if (vmc) { |
329 | vmc->qemu.backup = true; | |
330 | ||
331 | // only mark as VZDUMP once we have set everything up, otherwise 'cleanup' | |
332 | // might try to access an invalid value | |
333 | client->type = CLIENT_VZDUMP; | |
42edf948 | 334 | VERBOSE_PRINT("%s: vzdump backup started\n", client->vzdump.vmid); |
3ff85001 | 335 | } else { |
42edf948 | 336 | VERBOSE_PRINT("%s: vzdump requested backup start for unregistered VM\n", client->vzdump.vmid); |
4c17b2e3 DC |
337 | } |
338 | } | |
339 | ||
340 | /* | |
341 | * client management functions | |
342 | */ | |
343 | ||
344 | void | |
345 | add_new_client(int client_fd) | |
346 | { | |
347 | struct Client *client = calloc(sizeof(struct Client), 1); | |
6d4f89b6 TL |
348 | if (client == NULL) { |
349 | fprintf(stderr, "could not add new client - allocation failed!\n"); | |
350 | fflush(stderr); | |
351 | return; | |
352 | } | |
3ff85001 SR |
353 | client->state = STATE_HANDSHAKE; |
354 | client->type = CLIENT_NONE; | |
4c17b2e3 DC |
355 | client->fd = client_fd; |
356 | client->pid = get_pid_from_fd(client_fd); | |
357 | if (client->pid == 0) { | |
358 | fprintf(stderr, "could not get pid from client\n"); | |
359 | goto err; | |
360 | } | |
4c17b2e3 DC |
361 | |
362 | struct epoll_event ev; | |
363 | ev.events = EPOLLIN; | |
364 | ev.data.ptr = client; | |
3ff85001 | 365 | int res = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &ev); |
4c17b2e3 DC |
366 | if (res < 0) { |
367 | perror("epoll_ctl client add"); | |
368 | goto err; | |
369 | } | |
370 | ||
3ff85001 | 371 | VERBOSE_PRINT("added new client, pid: %d\n", client->pid); |
4c17b2e3 DC |
372 | |
373 | return; | |
374 | err: | |
375 | (void)close(client_fd); | |
376 | free(client); | |
377 | } | |
378 | ||
3ff85001 SR |
379 | static void |
380 | cleanup_qemu_client(struct Client *client) | |
4c17b2e3 | 381 | { |
3ff85001 SR |
382 | unsigned short graceful = client->qemu.graceful; |
383 | unsigned short guest = client->qemu.guest; | |
384 | char vmid[sizeof(client->qemu.vmid)]; | |
385 | strncpy(vmid, client->qemu.vmid, sizeof(vmid)); | |
386 | g_hash_table_remove(vm_clients, &vmid); // frees key, ignore errors | |
387 | VERBOSE_PRINT("%s: executing cleanup (graceful: %d, guest: %d)\n", | |
388 | vmid, graceful, guest); | |
4c17b2e3 DC |
389 | |
390 | int pid = fork(); | |
391 | if (pid < 0) { | |
392 | fprintf(stderr, "fork failed: %s\n", strerror(errno)); | |
393 | return; | |
394 | } | |
395 | if (pid == 0) { | |
396 | char *script = "/usr/sbin/qm"; | |
397 | ||
398 | char *args[] = { | |
399 | script, | |
400 | "cleanup", | |
401 | vmid, | |
402 | graceful ? "1" : "0", | |
403 | guest ? "1" : "0", | |
404 | NULL | |
405 | }; | |
406 | ||
407 | execvp(script, args); | |
408 | perror("execvp"); | |
409 | _exit(1); | |
410 | } | |
411 | } | |
412 | ||
3ff85001 SR |
413 | void |
414 | cleanup_client(struct Client *client) | |
415 | { | |
416 | log_neg(epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->fd, NULL), "epoll del"); | |
417 | (void)close(client->fd); | |
418 | ||
419 | struct Client *vmc; | |
420 | switch (client->type) { | |
421 | case CLIENT_QEMU: | |
422 | cleanup_qemu_client(client); | |
423 | break; | |
424 | ||
425 | case CLIENT_VZDUMP: | |
426 | vmc = (struct Client*) g_hash_table_lookup(vm_clients, client->vzdump.vmid); | |
427 | if (vmc) { | |
428 | VERBOSE_PRINT("%s: backup ended\n", client->vzdump.vmid); | |
429 | vmc->qemu.backup = false; | |
430 | terminate_check(vmc); | |
431 | } | |
432 | break; | |
433 | ||
434 | case CLIENT_NONE: | |
435 | // do nothing, only close socket | |
436 | break; | |
437 | } | |
438 | ||
439 | free(client); | |
440 | } | |
441 | ||
442 | void | |
443 | terminate_client(struct Client *client) | |
444 | { | |
42edf948 | 445 | VERBOSE_PRINT("%s: terminating client (pid %d)\n", client->qemu.vmid, client->pid); |
3ff85001 SR |
446 | |
447 | client->state = STATE_TERMINATING; | |
448 | ||
4c500f16 SR |
449 | // open a pidfd before kill for later cleanup |
450 | int pidfd = pidfd_open(client->pid, 0); | |
451 | if (pidfd < 0) { | |
452 | switch (errno) { | |
453 | case ESRCH: | |
454 | // process already dead for some reason, cleanup done | |
455 | VERBOSE_PRINT("%s: failed to open pidfd, process already dead (pid %d)\n", | |
456 | client->qemu.vmid, client->pid); | |
457 | return; | |
458 | ||
459 | // otherwise fall back to just using the PID directly, but don't | |
460 | // print if we only failed because we're running on an older kernel | |
461 | case ENOSYS: | |
462 | break; | |
463 | default: | |
464 | perror("failed to open QEMU pidfd for cleanup"); | |
465 | break; | |
466 | } | |
467 | } | |
468 | ||
3ff85001 SR |
469 | int err = kill(client->pid, SIGTERM); |
470 | log_neg(err, "kill"); | |
4c500f16 SR |
471 | |
472 | struct CleanupData *data_ptr = malloc(sizeof(struct CleanupData)); | |
473 | struct CleanupData data = { | |
474 | .pid = client->pid, | |
475 | .pidfd = pidfd | |
476 | }; | |
477 | *data_ptr = data; | |
478 | forced_cleanups = g_slist_prepend(forced_cleanups, (void *)data_ptr); | |
479 | ||
480 | // resets any other alarms, but will fire eventually and cleanup all | |
481 | alarm(5); | |
3ff85001 SR |
482 | } |
483 | ||
4c17b2e3 DC |
484 | void |
485 | handle_client(struct Client *client) | |
486 | { | |
3ff85001 | 487 | VERBOSE_PRINT("pid%d: entering handle\n", client->pid); |
4c17b2e3 DC |
488 | ssize_t len; |
489 | do { | |
490 | len = read(client->fd, (client->buf+client->buflen), | |
491 | sizeof(client->buf) - client->buflen); | |
492 | } while (len < 0 && errno == EINTR); | |
493 | ||
494 | if (len < 0) { | |
495 | if (!(errno == EAGAIN || errno == EWOULDBLOCK)) { | |
496 | log_neg((int)len, "read"); | |
497 | cleanup_client(client); | |
498 | } | |
499 | return; | |
500 | } else if (len == 0) { | |
3ff85001 | 501 | VERBOSE_PRINT("pid%d: got EOF\n", client->pid); |
4c17b2e3 DC |
502 | cleanup_client(client); |
503 | return; | |
504 | } | |
505 | ||
3ff85001 | 506 | VERBOSE_PRINT("pid%d: read %ld bytes\n", client->pid, len); |
4c17b2e3 DC |
507 | client->buflen += len; |
508 | ||
509 | struct json_tokener *tok = json_tokener_new(); | |
510 | struct json_object *jobj = NULL; | |
511 | enum json_tokener_error jerr = json_tokener_success; | |
512 | while (jerr == json_tokener_success && client->buflen != 0) { | |
513 | jobj = json_tokener_parse_ex(tok, client->buf, (int)client->buflen); | |
514 | jerr = json_tokener_get_error(tok); | |
515 | unsigned int offset = (unsigned int)tok->char_offset; | |
516 | switch (jerr) { | |
517 | case json_tokener_success: | |
518 | // move rest from buffer to front | |
519 | memmove(client->buf, client->buf + offset, client->buflen - offset); | |
520 | client->buflen -= offset; | |
521 | if (json_object_is_type(jobj, json_type_object)) { | |
522 | struct json_object *obj; | |
523 | if (json_object_object_get_ex(jobj, "QMP", &obj)) { | |
524 | handle_qmp_handshake(client); | |
525 | } else if (json_object_object_get_ex(jobj, "event", &obj)) { | |
526 | handle_qmp_event(client, jobj); | |
3ff85001 SR |
527 | } else if (json_object_object_get_ex(jobj, "return", &obj)) { |
528 | handle_qmp_return(client, obj, false); | |
529 | } else if (json_object_object_get_ex(jobj, "error", &obj)) { | |
530 | handle_qmp_return(client, obj, true); | |
531 | } else if (json_object_object_get_ex(jobj, "vzdump", &obj)) { | |
532 | handle_vzdump_handshake(client, obj); | |
4c17b2e3 DC |
533 | } // else ignore message |
534 | } | |
535 | break; | |
536 | case json_tokener_continue: | |
537 | if (client->buflen >= sizeof(client->buf)) { | |
a2488e4c | 538 | VERBOSE_PRINT("pid%d: msg too large, discarding buffer\n", client->pid); |
4c17b2e3 DC |
539 | memset(client->buf, 0, sizeof(client->buf)); |
540 | client->buflen = 0; | |
541 | } // else we have enough space try again after next read | |
542 | break; | |
543 | default: | |
a2488e4c | 544 | VERBOSE_PRINT("pid%d: parse error: %d, discarding buffer\n", client->pid, jerr); |
4c17b2e3 DC |
545 | memset(client->buf, 0, client->buflen); |
546 | client->buflen = 0; | |
547 | break; | |
548 | } | |
549 | json_object_put(jobj); | |
550 | } | |
551 | json_tokener_free(tok); | |
552 | } | |
553 | ||
554 | ||
4c500f16 SR |
555 | /* |
556 | * SIGALRM and cleanup handling | |
557 | * | |
558 | * terminate_client will set an alarm for 5 seconds and add its client's PID to | |
559 | * the forced_cleanups list - when the timer expires, we iterate the list and | |
560 | * attempt to issue SIGKILL to all processes which haven't yet stopped. | |
561 | */ | |
562 | ||
563 | static void | |
564 | alarm_handler(__attribute__((unused)) int signum) | |
565 | { | |
566 | alarm_triggered = 1; | |
567 | } | |
568 | ||
569 | static void | |
570 | sigkill(void *ptr, __attribute__((unused)) void *unused) | |
571 | { | |
572 | struct CleanupData data = *((struct CleanupData *)ptr); | |
573 | int err; | |
574 | ||
575 | if (data.pidfd > 0) { | |
576 | err = pidfd_send_signal(data.pidfd, SIGKILL, NULL, 0); | |
0a279963 | 577 | (void)close(data.pidfd); |
4c500f16 SR |
578 | } else { |
579 | err = kill(data.pid, SIGKILL); | |
580 | } | |
581 | ||
582 | if (err < 0) { | |
583 | if (errno != ESRCH) { | |
584 | fprintf(stderr, "SIGKILL cleanup of pid '%d' failed - %s\n", | |
585 | data.pid, strerror(errno)); | |
586 | } | |
587 | } else { | |
588 | fprintf(stderr, "cleanup failed, terminating pid '%d' with SIGKILL\n", | |
589 | data.pid); | |
590 | } | |
591 | } | |
592 | ||
593 | static void | |
594 | handle_forced_cleanup() | |
595 | { | |
596 | if (alarm_triggered) { | |
0a279963 | 597 | VERBOSE_PRINT("clearing forced cleanup backlog\n"); |
4c500f16 SR |
598 | alarm_triggered = 0; |
599 | g_slist_foreach(forced_cleanups, sigkill, NULL); | |
600 | g_slist_free_full(forced_cleanups, free); | |
601 | forced_cleanups = NULL; | |
602 | } | |
603 | } | |
604 | ||
605 | ||
4c17b2e3 DC |
606 | int |
607 | main(int argc, char *argv[]) | |
608 | { | |
609 | int opt; | |
610 | int daemonize = 1; | |
611 | char *socket_path = NULL; | |
612 | progname = argv[0]; | |
613 | ||
614 | while ((opt = getopt(argc, argv, "hfv")) != -1) { | |
615 | switch (opt) { | |
616 | case 'f': | |
617 | daemonize = 0; | |
618 | break; | |
619 | case 'v': | |
620 | verbose = 1; | |
621 | break; | |
622 | case 'h': | |
623 | usage(); | |
624 | exit(EXIT_SUCCESS); | |
625 | break; | |
626 | default: | |
627 | usage(); | |
628 | exit(EXIT_FAILURE); | |
629 | } | |
630 | } | |
631 | ||
632 | if (optind >= argc) { | |
633 | usage(); | |
634 | exit(EXIT_FAILURE); | |
635 | } | |
636 | ||
637 | signal(SIGCHLD, SIG_IGN); | |
4c500f16 | 638 | signal(SIGALRM, alarm_handler); |
4c17b2e3 DC |
639 | |
640 | socket_path = argv[optind]; | |
641 | ||
642 | int sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
643 | bail_neg(sock, "socket"); | |
644 | ||
645 | struct sockaddr_un addr; | |
646 | memset(&addr, 0, sizeof(addr)); | |
647 | addr.sun_family = AF_UNIX; | |
648 | strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1); | |
649 | ||
650 | unlink(socket_path); | |
651 | bail_neg(bind(sock, (struct sockaddr*)&addr, sizeof(addr)), "bind"); | |
652 | ||
653 | struct epoll_event ev, events[1]; | |
654 | epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
655 | bail_neg(epoll_fd, "epoll_create1"); | |
656 | ||
657 | ev.events = EPOLLIN; | |
658 | ev.data.fd = sock; | |
659 | bail_neg(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev), "epoll_ctl"); | |
660 | ||
661 | bail_neg(listen(sock, 10), "listen"); | |
662 | ||
663 | if (daemonize) { | |
664 | bail_neg(daemon(0, 1), "daemon"); | |
665 | } | |
666 | ||
3ff85001 SR |
667 | vm_clients = g_hash_table_new_full(g_str_hash, g_str_equal, free, NULL); |
668 | ||
4c17b2e3 DC |
669 | int nevents; |
670 | ||
671 | for(;;) { | |
672 | nevents = epoll_wait(epoll_fd, events, 1, -1); | |
673 | if (nevents < 0 && errno == EINTR) { | |
4c500f16 | 674 | handle_forced_cleanup(); |
4c17b2e3 DC |
675 | continue; |
676 | } | |
677 | bail_neg(nevents, "epoll_wait"); | |
678 | ||
679 | for (int n = 0; n < nevents; n++) { | |
680 | if (events[n].data.fd == sock) { | |
681 | ||
42edf948 | 682 | int conn_sock = accept4(sock, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC); |
4c17b2e3 DC |
683 | log_neg(conn_sock, "accept"); |
684 | if (conn_sock > -1) { | |
685 | add_new_client(conn_sock); | |
686 | } | |
687 | } else { | |
688 | handle_client((struct Client *)events[n].data.ptr); | |
689 | } | |
690 | } | |
4c500f16 SR |
691 | |
692 | handle_forced_cleanup(); | |
4c17b2e3 DC |
693 | } |
694 | } |