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Commit | Line | Data |
---|---|---|
d59f11e1 | 1 | /* |
55e9959b | 2 | * libudev - interface to udev device information |
d59f11e1 | 3 | * |
1298001e | 4 | * Copyright (C) 2008 Kay Sievers <kay@vrfy.org> |
d59f11e1 | 5 | * |
4061ab9f KS |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
d59f11e1 KS |
10 | */ |
11 | ||
d59f11e1 KS |
12 | #include <errno.h> |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <stddef.h> | |
16 | #include <string.h> | |
17 | #include <unistd.h> | |
18 | #include <sys/types.h> | |
ff2c503d | 19 | #include <sys/poll.h> |
d59f11e1 KS |
20 | #include <sys/socket.h> |
21 | #include <sys/un.h> | |
22 | ||
c15d02e5 | 23 | #include "udev.h" |
d59f11e1 | 24 | |
540f4669 | 25 | /* wire protocol magic must match */ |
912541b0 | 26 | #define UDEV_CTRL_MAGIC 0xdead1dea |
d59f11e1 KS |
27 | |
28 | enum udev_ctrl_msg_type { | |
912541b0 KS |
29 | UDEV_CTRL_UNKNOWN, |
30 | UDEV_CTRL_SET_LOG_LEVEL, | |
31 | UDEV_CTRL_STOP_EXEC_QUEUE, | |
32 | UDEV_CTRL_START_EXEC_QUEUE, | |
33 | UDEV_CTRL_RELOAD, | |
34 | UDEV_CTRL_SET_ENV, | |
35 | UDEV_CTRL_SET_CHILDREN_MAX, | |
36 | UDEV_CTRL_PING, | |
37 | UDEV_CTRL_EXIT, | |
d59f11e1 KS |
38 | }; |
39 | ||
b692a750 | 40 | struct udev_ctrl_msg_wire { |
912541b0 KS |
41 | char version[16]; |
42 | unsigned int magic; | |
43 | enum udev_ctrl_msg_type type; | |
44 | union { | |
45 | int intval; | |
46 | char buf[256]; | |
47 | }; | |
d59f11e1 KS |
48 | }; |
49 | ||
50 | struct udev_ctrl_msg { | |
912541b0 KS |
51 | int refcount; |
52 | struct udev_ctrl_connection *conn; | |
53 | struct udev_ctrl_msg_wire ctrl_msg_wire; | |
d59f11e1 KS |
54 | }; |
55 | ||
56 | struct udev_ctrl { | |
912541b0 KS |
57 | int refcount; |
58 | struct udev *udev; | |
59 | int sock; | |
60 | struct sockaddr_un saddr; | |
61 | socklen_t addrlen; | |
62 | bool bound; | |
63 | bool cleanup_socket; | |
64 | bool connected; | |
ff2c503d KS |
65 | }; |
66 | ||
67 | struct udev_ctrl_connection { | |
912541b0 KS |
68 | int refcount; |
69 | struct udev_ctrl *uctrl; | |
70 | int sock; | |
d59f11e1 KS |
71 | }; |
72 | ||
5cc4112e | 73 | struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) |
d59f11e1 | 74 | { |
912541b0 | 75 | struct udev_ctrl *uctrl; |
b97caef5 | 76 | const int on = 1; |
912541b0 KS |
77 | |
78 | uctrl = calloc(1, sizeof(struct udev_ctrl)); | |
79 | if (uctrl == NULL) | |
80 | return NULL; | |
81 | uctrl->refcount = 1; | |
82 | uctrl->udev = udev; | |
83 | ||
84 | if (fd < 0) { | |
85 | uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
86 | if (uctrl->sock < 0) { | |
9f6445e3 | 87 | log_error("error getting socket: %m"); |
912541b0 KS |
88 | udev_ctrl_unref(uctrl); |
89 | return NULL; | |
90 | } | |
91 | } else { | |
92 | uctrl->bound = true; | |
93 | uctrl->sock = fd; | |
94 | } | |
b97caef5 | 95 | setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
912541b0 KS |
96 | |
97 | uctrl->saddr.sun_family = AF_LOCAL; | |
d5a89d7d | 98 | strscpy(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path), "/run/udev/control"); |
912541b0 KS |
99 | uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path); |
100 | return uctrl; | |
fc1de713 KS |
101 | } |
102 | ||
5cc4112e | 103 | struct udev_ctrl *udev_ctrl_new(struct udev *udev) |
fc1de713 | 104 | { |
912541b0 | 105 | return udev_ctrl_new_from_fd(udev, -1); |
d59f11e1 KS |
106 | } |
107 | ||
108 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) | |
109 | { | |
912541b0 KS |
110 | int err; |
111 | ||
112 | if (!uctrl->bound) { | |
113 | err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen); | |
114 | if (err < 0 && errno == EADDRINUSE) { | |
115 | unlink(uctrl->saddr.sun_path); | |
116 | err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen); | |
117 | } | |
118 | ||
119 | if (err < 0) { | |
120 | err = -errno; | |
9f6445e3 | 121 | log_error("bind failed: %m"); |
912541b0 KS |
122 | return err; |
123 | } | |
124 | ||
125 | err = listen(uctrl->sock, 0); | |
126 | if (err < 0) { | |
127 | err = -errno; | |
9f6445e3 | 128 | log_error("listen failed: %m"); |
912541b0 KS |
129 | return err; |
130 | } | |
131 | ||
132 | uctrl->bound = true; | |
133 | uctrl->cleanup_socket = true; | |
134 | } | |
135 | return 0; | |
d59f11e1 KS |
136 | } |
137 | ||
138 | struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl) | |
139 | { | |
912541b0 | 140 | return uctrl->udev; |
d59f11e1 KS |
141 | } |
142 | ||
b2661839 | 143 | static struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl) |
d59f11e1 | 144 | { |
912541b0 KS |
145 | if (uctrl == NULL) |
146 | return NULL; | |
147 | uctrl->refcount++; | |
148 | return uctrl; | |
d59f11e1 KS |
149 | } |
150 | ||
ff2c503d | 151 | struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) |
d59f11e1 | 152 | { |
912541b0 KS |
153 | if (uctrl == NULL) |
154 | return NULL; | |
155 | uctrl->refcount--; | |
156 | if (uctrl->refcount > 0) | |
157 | return uctrl; | |
158 | if (uctrl->sock >= 0) | |
159 | close(uctrl->sock); | |
160 | free(uctrl); | |
161 | return NULL; | |
d59f11e1 KS |
162 | } |
163 | ||
1f5a5100 KS |
164 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) |
165 | { | |
912541b0 KS |
166 | if (uctrl == NULL) |
167 | return 0; | |
168 | if (uctrl->cleanup_socket) | |
169 | unlink(uctrl->saddr.sun_path); | |
170 | return 0; | |
1f5a5100 KS |
171 | } |
172 | ||
d59f11e1 KS |
173 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) |
174 | { | |
912541b0 KS |
175 | if (uctrl == NULL) |
176 | return -EINVAL; | |
177 | return uctrl->sock; | |
d59f11e1 KS |
178 | } |
179 | ||
ff2c503d KS |
180 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) |
181 | { | |
912541b0 KS |
182 | struct udev_ctrl_connection *conn; |
183 | struct ucred ucred; | |
912541b0 | 184 | const int on = 1; |
eff05270 | 185 | int r; |
912541b0 | 186 | |
eff05270 | 187 | conn = new(struct udev_ctrl_connection, 1); |
912541b0 KS |
188 | if (conn == NULL) |
189 | return NULL; | |
190 | conn->refcount = 1; | |
191 | conn->uctrl = uctrl; | |
192 | ||
193 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
194 | if (conn->sock < 0) { | |
195 | if (errno != EINTR) | |
9f6445e3 | 196 | log_error("unable to receive ctrl connection: %m"); |
912541b0 KS |
197 | goto err; |
198 | } | |
199 | ||
200 | /* check peer credential of connection */ | |
eff05270 LP |
201 | r = getpeercred(conn->sock, &ucred); |
202 | if (r < 0) { | |
203 | log_error("unable to receive credentials of ctrl connection: %s", strerror(-r)); | |
912541b0 KS |
204 | goto err; |
205 | } | |
206 | if (ucred.uid > 0) { | |
9f6445e3 | 207 | log_error("sender uid=%i, message ignored", ucred.uid); |
912541b0 KS |
208 | goto err; |
209 | } | |
210 | ||
211 | /* enable receiving of the sender credentials in the messages */ | |
212 | setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
213 | udev_ctrl_ref(uctrl); | |
214 | return conn; | |
2c64f589 | 215 | err: |
912541b0 KS |
216 | if (conn->sock >= 0) |
217 | close(conn->sock); | |
218 | free(conn); | |
219 | return NULL; | |
ff2c503d KS |
220 | } |
221 | ||
222 | struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) | |
223 | { | |
912541b0 KS |
224 | if (conn == NULL) |
225 | return NULL; | |
226 | conn->refcount++; | |
227 | return conn; | |
ff2c503d KS |
228 | } |
229 | ||
230 | struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) | |
231 | { | |
912541b0 KS |
232 | if (conn == NULL) |
233 | return NULL; | |
234 | conn->refcount--; | |
235 | if (conn->refcount > 0) | |
236 | return conn; | |
237 | if (conn->sock >= 0) | |
238 | close(conn->sock); | |
239 | udev_ctrl_unref(conn->uctrl); | |
240 | free(conn); | |
241 | return NULL; | |
ff2c503d KS |
242 | } |
243 | ||
244 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) | |
d59f11e1 | 245 | { |
912541b0 KS |
246 | struct udev_ctrl_msg_wire ctrl_msg_wire; |
247 | int err = 0; | |
248 | ||
29804cc1 | 249 | memzero(&ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire)); |
912541b0 KS |
250 | strcpy(ctrl_msg_wire.version, "udev-" VERSION); |
251 | ctrl_msg_wire.magic = UDEV_CTRL_MAGIC; | |
252 | ctrl_msg_wire.type = type; | |
253 | ||
254 | if (buf != NULL) | |
d5a89d7d | 255 | strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); |
912541b0 KS |
256 | else |
257 | ctrl_msg_wire.intval = intval; | |
258 | ||
259 | if (!uctrl->connected) { | |
260 | if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) { | |
261 | err = -errno; | |
262 | goto out; | |
263 | } | |
264 | uctrl->connected = true; | |
265 | } | |
266 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) { | |
267 | err = -errno; | |
268 | goto out; | |
269 | } | |
270 | ||
271 | /* wait for peer message handling or disconnect */ | |
272 | for (;;) { | |
273 | struct pollfd pfd[1]; | |
274 | int r; | |
275 | ||
276 | pfd[0].fd = uctrl->sock; | |
277 | pfd[0].events = POLLIN; | |
278 | r = poll(pfd, 1, timeout * 1000); | |
279 | if (r < 0) { | |
280 | if (errno == EINTR) | |
281 | continue; | |
282 | err = -errno; | |
283 | break; | |
284 | } | |
285 | ||
286 | if (r > 0 && pfd[0].revents & POLLERR) { | |
287 | err = -EIO; | |
288 | break; | |
289 | } | |
290 | ||
291 | if (r == 0) | |
292 | err = -ETIMEDOUT; | |
293 | break; | |
294 | } | |
ff2c503d | 295 | out: |
912541b0 | 296 | return err; |
d59f11e1 KS |
297 | } |
298 | ||
ff2c503d KS |
299 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) |
300 | { | |
912541b0 | 301 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
302 | } |
303 | ||
304 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) | |
d59f11e1 | 305 | { |
912541b0 | 306 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
307 | } |
308 | ||
ff2c503d | 309 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 310 | { |
912541b0 | 311 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
312 | } |
313 | ||
7c85d636 | 314 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 315 | { |
912541b0 | 316 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
317 | } |
318 | ||
ff2c503d | 319 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) |
d59f11e1 | 320 | { |
912541b0 | 321 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
322 | } |
323 | ||
ff2c503d | 324 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) |
d59f11e1 | 325 | { |
912541b0 | 326 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
327 | } |
328 | ||
ff2c503d | 329 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 330 | { |
912541b0 | 331 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
332 | } |
333 | ||
ff2c503d | 334 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) |
bb38678e | 335 | { |
912541b0 | 336 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
337 | } |
338 | ||
ff2c503d | 339 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) |
d59f11e1 | 340 | { |
912541b0 KS |
341 | struct udev_ctrl_msg *uctrl_msg; |
342 | ssize_t size; | |
912541b0 KS |
343 | struct cmsghdr *cmsg; |
344 | struct iovec iov; | |
912541b0 | 345 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
97fec53e ZJS |
346 | struct msghdr smsg = { |
347 | .msg_iov = &iov, | |
348 | .msg_iovlen = 1, | |
349 | .msg_control = cred_msg, | |
350 | .msg_controllen = sizeof(cred_msg), | |
351 | }; | |
352 | struct ucred *cred; | |
912541b0 | 353 | |
97fec53e | 354 | uctrl_msg = new0(struct udev_ctrl_msg, 1); |
912541b0 KS |
355 | if (uctrl_msg == NULL) |
356 | return NULL; | |
357 | uctrl_msg->refcount = 1; | |
358 | uctrl_msg->conn = conn; | |
359 | udev_ctrl_connection_ref(conn); | |
360 | ||
361 | /* wait for the incoming message */ | |
f168c273 | 362 | for (;;) { |
912541b0 KS |
363 | struct pollfd pfd[1]; |
364 | int r; | |
365 | ||
366 | pfd[0].fd = conn->sock; | |
367 | pfd[0].events = POLLIN; | |
368 | ||
369 | r = poll(pfd, 1, 10000); | |
370 | if (r < 0) { | |
371 | if (errno == EINTR) | |
372 | continue; | |
373 | goto err; | |
374 | } else if (r == 0) { | |
9f6445e3 | 375 | log_error("timeout waiting for ctrl message"); |
912541b0 KS |
376 | goto err; |
377 | } else { | |
378 | if (!(pfd[0].revents & POLLIN)) { | |
9f6445e3 | 379 | log_error("ctrl connection error: %m"); |
912541b0 KS |
380 | goto err; |
381 | } | |
382 | } | |
383 | ||
384 | break; | |
385 | } | |
386 | ||
387 | iov.iov_base = &uctrl_msg->ctrl_msg_wire; | |
388 | iov.iov_len = sizeof(struct udev_ctrl_msg_wire); | |
97fec53e | 389 | |
912541b0 KS |
390 | size = recvmsg(conn->sock, &smsg, 0); |
391 | if (size < 0) { | |
9f6445e3 | 392 | log_error("unable to receive ctrl message: %m"); |
912541b0 KS |
393 | goto err; |
394 | } | |
395 | cmsg = CMSG_FIRSTHDR(&smsg); | |
396 | cred = (struct ucred *) CMSG_DATA(cmsg); | |
397 | ||
398 | if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { | |
9f6445e3 | 399 | log_error("no sender credentials received, message ignored"); |
912541b0 KS |
400 | goto err; |
401 | } | |
402 | ||
403 | if (cred->uid != 0) { | |
9f6445e3 | 404 | log_error("sender uid=%i, message ignored", cred->uid); |
912541b0 KS |
405 | goto err; |
406 | } | |
407 | ||
408 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
9f6445e3 | 409 | log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic); |
912541b0 KS |
410 | goto err; |
411 | } | |
412 | ||
912541b0 | 413 | return uctrl_msg; |
d59f11e1 | 414 | err: |
912541b0 KS |
415 | udev_ctrl_msg_unref(uctrl_msg); |
416 | return NULL; | |
d59f11e1 KS |
417 | } |
418 | ||
ff2c503d | 419 | struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 420 | { |
912541b0 KS |
421 | if (ctrl_msg == NULL) |
422 | return NULL; | |
423 | ctrl_msg->refcount--; | |
424 | if (ctrl_msg->refcount > 0) | |
425 | return ctrl_msg; | |
912541b0 KS |
426 | udev_ctrl_connection_unref(ctrl_msg->conn); |
427 | free(ctrl_msg); | |
428 | return NULL; | |
d59f11e1 KS |
429 | } |
430 | ||
431 | int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) | |
432 | { | |
912541b0 KS |
433 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL) |
434 | return ctrl_msg->ctrl_msg_wire.intval; | |
435 | return -1; | |
d59f11e1 KS |
436 | } |
437 | ||
438 | int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) | |
439 | { | |
912541b0 KS |
440 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE) |
441 | return 1; | |
442 | return -1; | |
d59f11e1 KS |
443 | } |
444 | ||
445 | int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) | |
446 | { | |
912541b0 KS |
447 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE) |
448 | return 1; | |
449 | return -1; | |
d59f11e1 KS |
450 | } |
451 | ||
7c85d636 | 452 | int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 453 | { |
912541b0 KS |
454 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD) |
455 | return 1; | |
456 | return -1; | |
d59f11e1 KS |
457 | } |
458 | ||
459 | const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) | |
460 | { | |
912541b0 KS |
461 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV) |
462 | return ctrl_msg->ctrl_msg_wire.buf; | |
463 | return NULL; | |
d59f11e1 KS |
464 | } |
465 | ||
87d55ff6 | 466 | int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 467 | { |
912541b0 KS |
468 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX) |
469 | return ctrl_msg->ctrl_msg_wire.intval; | |
470 | return -1; | |
d59f11e1 | 471 | } |
bb38678e | 472 | |
ff2c503d | 473 | int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) |
bb38678e | 474 | { |
912541b0 KS |
475 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING) |
476 | return 1; | |
477 | return -1; | |
ff2c503d KS |
478 | } |
479 | ||
480 | int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) | |
481 | { | |
912541b0 KS |
482 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT) |
483 | return 1; | |
484 | return -1; | |
bb38678e | 485 | } |