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Commit | Line | Data |
---|---|---|
d59f11e1 | 1 | /* |
55e9959b | 2 | * libudev - interface to udev device information |
d59f11e1 | 3 | * |
55e9959b | 4 | * Copyright (C) 2008 Kay Sievers <kay.sievers@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 KS |
75 | struct udev_ctrl *uctrl; |
76 | ||
77 | uctrl = calloc(1, sizeof(struct udev_ctrl)); | |
78 | if (uctrl == NULL) | |
79 | return NULL; | |
80 | uctrl->refcount = 1; | |
81 | uctrl->udev = udev; | |
82 | ||
83 | if (fd < 0) { | |
84 | uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
85 | if (uctrl->sock < 0) { | |
86 | err(udev, "error getting socket: %m\n"); | |
87 | udev_ctrl_unref(uctrl); | |
88 | return NULL; | |
89 | } | |
90 | } else { | |
91 | uctrl->bound = true; | |
92 | uctrl->sock = fd; | |
93 | } | |
94 | ||
95 | uctrl->saddr.sun_family = AF_LOCAL; | |
96 | util_strscpyl(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path), | |
5cc4112e | 97 | udev_get_run_path(udev), "/control", NULL); |
912541b0 KS |
98 | uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path); |
99 | return uctrl; | |
fc1de713 KS |
100 | } |
101 | ||
5cc4112e | 102 | struct udev_ctrl *udev_ctrl_new(struct udev *udev) |
fc1de713 | 103 | { |
912541b0 | 104 | return udev_ctrl_new_from_fd(udev, -1); |
d59f11e1 KS |
105 | } |
106 | ||
107 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) | |
108 | { | |
912541b0 KS |
109 | int err; |
110 | ||
111 | if (!uctrl->bound) { | |
112 | err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen); | |
113 | if (err < 0 && errno == EADDRINUSE) { | |
114 | unlink(uctrl->saddr.sun_path); | |
115 | err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen); | |
116 | } | |
117 | ||
118 | if (err < 0) { | |
119 | err = -errno; | |
120 | err(uctrl->udev, "bind failed: %m\n"); | |
121 | return err; | |
122 | } | |
123 | ||
124 | err = listen(uctrl->sock, 0); | |
125 | if (err < 0) { | |
126 | err = -errno; | |
127 | err(uctrl->udev, "listen failed: %m\n"); | |
128 | return err; | |
129 | } | |
130 | ||
131 | uctrl->bound = true; | |
132 | uctrl->cleanup_socket = true; | |
133 | } | |
134 | return 0; | |
d59f11e1 KS |
135 | } |
136 | ||
137 | struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl) | |
138 | { | |
912541b0 | 139 | return uctrl->udev; |
d59f11e1 KS |
140 | } |
141 | ||
142 | struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl) | |
143 | { | |
912541b0 KS |
144 | if (uctrl == NULL) |
145 | return NULL; | |
146 | uctrl->refcount++; | |
147 | return uctrl; | |
d59f11e1 KS |
148 | } |
149 | ||
ff2c503d | 150 | struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) |
d59f11e1 | 151 | { |
912541b0 KS |
152 | if (uctrl == NULL) |
153 | return NULL; | |
154 | uctrl->refcount--; | |
155 | if (uctrl->refcount > 0) | |
156 | return uctrl; | |
157 | if (uctrl->sock >= 0) | |
158 | close(uctrl->sock); | |
159 | free(uctrl); | |
160 | return NULL; | |
d59f11e1 KS |
161 | } |
162 | ||
1f5a5100 KS |
163 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) |
164 | { | |
912541b0 KS |
165 | if (uctrl == NULL) |
166 | return 0; | |
167 | if (uctrl->cleanup_socket) | |
168 | unlink(uctrl->saddr.sun_path); | |
169 | return 0; | |
1f5a5100 KS |
170 | } |
171 | ||
d59f11e1 KS |
172 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) |
173 | { | |
912541b0 KS |
174 | if (uctrl == NULL) |
175 | return -EINVAL; | |
176 | return uctrl->sock; | |
d59f11e1 KS |
177 | } |
178 | ||
ff2c503d KS |
179 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) |
180 | { | |
912541b0 KS |
181 | struct udev_ctrl_connection *conn; |
182 | struct ucred ucred; | |
183 | socklen_t slen; | |
184 | const int on = 1; | |
185 | ||
186 | conn = calloc(1, sizeof(struct udev_ctrl_connection)); | |
187 | if (conn == NULL) | |
188 | return NULL; | |
189 | conn->refcount = 1; | |
190 | conn->uctrl = uctrl; | |
191 | ||
192 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
193 | if (conn->sock < 0) { | |
194 | if (errno != EINTR) | |
195 | err(uctrl->udev, "unable to receive ctrl connection: %m\n"); | |
196 | goto err; | |
197 | } | |
198 | ||
199 | /* check peer credential of connection */ | |
200 | slen = sizeof(ucred); | |
201 | if (getsockopt(conn->sock, SOL_SOCKET, SO_PEERCRED, &ucred, &slen) < 0) { | |
202 | err(uctrl->udev, "unable to receive credentials of ctrl connection: %m\n"); | |
203 | goto err; | |
204 | } | |
205 | if (ucred.uid > 0) { | |
206 | err(uctrl->udev, "sender uid=%i, message ignored\n", ucred.uid); | |
207 | goto err; | |
208 | } | |
209 | ||
210 | /* enable receiving of the sender credentials in the messages */ | |
211 | setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
212 | udev_ctrl_ref(uctrl); | |
213 | return conn; | |
2c64f589 | 214 | err: |
912541b0 KS |
215 | if (conn->sock >= 0) |
216 | close(conn->sock); | |
217 | free(conn); | |
218 | return NULL; | |
ff2c503d KS |
219 | } |
220 | ||
221 | struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) | |
222 | { | |
912541b0 KS |
223 | if (conn == NULL) |
224 | return NULL; | |
225 | conn->refcount++; | |
226 | return conn; | |
ff2c503d KS |
227 | } |
228 | ||
229 | struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) | |
230 | { | |
912541b0 KS |
231 | if (conn == NULL) |
232 | return NULL; | |
233 | conn->refcount--; | |
234 | if (conn->refcount > 0) | |
235 | return conn; | |
236 | if (conn->sock >= 0) | |
237 | close(conn->sock); | |
238 | udev_ctrl_unref(conn->uctrl); | |
239 | free(conn); | |
240 | return NULL; | |
ff2c503d KS |
241 | } |
242 | ||
243 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) | |
d59f11e1 | 244 | { |
912541b0 KS |
245 | struct udev_ctrl_msg_wire ctrl_msg_wire; |
246 | int err = 0; | |
247 | ||
248 | memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire)); | |
249 | strcpy(ctrl_msg_wire.version, "udev-" VERSION); | |
250 | ctrl_msg_wire.magic = UDEV_CTRL_MAGIC; | |
251 | ctrl_msg_wire.type = type; | |
252 | ||
253 | if (buf != NULL) | |
254 | util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); | |
255 | else | |
256 | ctrl_msg_wire.intval = intval; | |
257 | ||
258 | if (!uctrl->connected) { | |
259 | if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) { | |
260 | err = -errno; | |
261 | goto out; | |
262 | } | |
263 | uctrl->connected = true; | |
264 | } | |
265 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) { | |
266 | err = -errno; | |
267 | goto out; | |
268 | } | |
269 | ||
270 | /* wait for peer message handling or disconnect */ | |
271 | for (;;) { | |
272 | struct pollfd pfd[1]; | |
273 | int r; | |
274 | ||
275 | pfd[0].fd = uctrl->sock; | |
276 | pfd[0].events = POLLIN; | |
277 | r = poll(pfd, 1, timeout * 1000); | |
278 | if (r < 0) { | |
279 | if (errno == EINTR) | |
280 | continue; | |
281 | err = -errno; | |
282 | break; | |
283 | } | |
284 | ||
285 | if (r > 0 && pfd[0].revents & POLLERR) { | |
286 | err = -EIO; | |
287 | break; | |
288 | } | |
289 | ||
290 | if (r == 0) | |
291 | err = -ETIMEDOUT; | |
292 | break; | |
293 | } | |
ff2c503d | 294 | out: |
912541b0 | 295 | return err; |
d59f11e1 KS |
296 | } |
297 | ||
ff2c503d KS |
298 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) |
299 | { | |
912541b0 | 300 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
301 | } |
302 | ||
303 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) | |
d59f11e1 | 304 | { |
912541b0 | 305 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
306 | } |
307 | ||
ff2c503d | 308 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 309 | { |
912541b0 | 310 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
311 | } |
312 | ||
7c85d636 | 313 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 314 | { |
912541b0 | 315 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
316 | } |
317 | ||
ff2c503d | 318 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) |
d59f11e1 | 319 | { |
912541b0 | 320 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
321 | } |
322 | ||
ff2c503d | 323 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) |
d59f11e1 | 324 | { |
912541b0 | 325 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
326 | } |
327 | ||
ff2c503d | 328 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) |
d59f11e1 | 329 | { |
912541b0 | 330 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
331 | } |
332 | ||
ff2c503d | 333 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) |
bb38678e | 334 | { |
912541b0 | 335 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
336 | } |
337 | ||
ff2c503d | 338 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) |
d59f11e1 | 339 | { |
912541b0 KS |
340 | struct udev *udev = conn->uctrl->udev; |
341 | struct udev_ctrl_msg *uctrl_msg; | |
342 | ssize_t size; | |
343 | struct msghdr smsg; | |
344 | struct cmsghdr *cmsg; | |
345 | struct iovec iov; | |
346 | struct ucred *cred; | |
347 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; | |
348 | ||
349 | uctrl_msg = calloc(1, sizeof(struct udev_ctrl_msg)); | |
350 | if (uctrl_msg == NULL) | |
351 | return NULL; | |
352 | uctrl_msg->refcount = 1; | |
353 | uctrl_msg->conn = conn; | |
354 | udev_ctrl_connection_ref(conn); | |
355 | ||
356 | /* wait for the incoming message */ | |
357 | for(;;) { | |
358 | struct pollfd pfd[1]; | |
359 | int r; | |
360 | ||
361 | pfd[0].fd = conn->sock; | |
362 | pfd[0].events = POLLIN; | |
363 | ||
364 | r = poll(pfd, 1, 10000); | |
365 | if (r < 0) { | |
366 | if (errno == EINTR) | |
367 | continue; | |
368 | goto err; | |
369 | } else if (r == 0) { | |
370 | err(udev, "timeout waiting for ctrl message\n"); | |
371 | goto err; | |
372 | } else { | |
373 | if (!(pfd[0].revents & POLLIN)) { | |
374 | err(udev, "ctrl connection error: %m\n"); | |
375 | goto err; | |
376 | } | |
377 | } | |
378 | ||
379 | break; | |
380 | } | |
381 | ||
382 | iov.iov_base = &uctrl_msg->ctrl_msg_wire; | |
383 | iov.iov_len = sizeof(struct udev_ctrl_msg_wire); | |
384 | memset(&smsg, 0x00, sizeof(struct msghdr)); | |
385 | smsg.msg_iov = &iov; | |
386 | smsg.msg_iovlen = 1; | |
387 | smsg.msg_control = cred_msg; | |
388 | smsg.msg_controllen = sizeof(cred_msg); | |
389 | size = recvmsg(conn->sock, &smsg, 0); | |
390 | if (size < 0) { | |
391 | err(udev, "unable to receive ctrl message: %m\n"); | |
392 | goto err; | |
393 | } | |
394 | cmsg = CMSG_FIRSTHDR(&smsg); | |
395 | cred = (struct ucred *) CMSG_DATA(cmsg); | |
396 | ||
397 | if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { | |
398 | err(udev, "no sender credentials received, message ignored\n"); | |
399 | goto err; | |
400 | } | |
401 | ||
402 | if (cred->uid != 0) { | |
403 | err(udev, "sender uid=%i, message ignored\n", cred->uid); | |
404 | goto err; | |
405 | } | |
406 | ||
407 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
408 | err(udev, "message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic); | |
409 | goto err; | |
410 | } | |
411 | ||
412 | dbg(udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg_wire.type); | |
413 | return uctrl_msg; | |
d59f11e1 | 414 | err: |
912541b0 KS |
415 | udev_ctrl_msg_unref(uctrl_msg); |
416 | return NULL; | |
d59f11e1 KS |
417 | } |
418 | ||
419 | struct udev_ctrl_msg *udev_ctrl_msg_ref(struct udev_ctrl_msg *ctrl_msg) | |
420 | { | |
912541b0 KS |
421 | if (ctrl_msg == NULL) |
422 | return NULL; | |
423 | ctrl_msg->refcount++; | |
424 | return ctrl_msg; | |
d59f11e1 KS |
425 | } |
426 | ||
ff2c503d | 427 | struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 428 | { |
912541b0 KS |
429 | if (ctrl_msg == NULL) |
430 | return NULL; | |
431 | ctrl_msg->refcount--; | |
432 | if (ctrl_msg->refcount > 0) | |
433 | return ctrl_msg; | |
434 | dbg(ctrl_msg->conn->uctrl->udev, "release ctrl_msg %p\n", ctrl_msg); | |
435 | udev_ctrl_connection_unref(ctrl_msg->conn); | |
436 | free(ctrl_msg); | |
437 | return NULL; | |
d59f11e1 KS |
438 | } |
439 | ||
440 | int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) | |
441 | { | |
912541b0 KS |
442 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL) |
443 | return ctrl_msg->ctrl_msg_wire.intval; | |
444 | return -1; | |
d59f11e1 KS |
445 | } |
446 | ||
447 | int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) | |
448 | { | |
912541b0 KS |
449 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE) |
450 | return 1; | |
451 | return -1; | |
d59f11e1 KS |
452 | } |
453 | ||
454 | int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) | |
455 | { | |
912541b0 KS |
456 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE) |
457 | return 1; | |
458 | return -1; | |
d59f11e1 KS |
459 | } |
460 | ||
7c85d636 | 461 | int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 462 | { |
912541b0 KS |
463 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD) |
464 | return 1; | |
465 | return -1; | |
d59f11e1 KS |
466 | } |
467 | ||
468 | const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) | |
469 | { | |
912541b0 KS |
470 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV) |
471 | return ctrl_msg->ctrl_msg_wire.buf; | |
472 | return NULL; | |
d59f11e1 KS |
473 | } |
474 | ||
87d55ff6 | 475 | int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) |
d59f11e1 | 476 | { |
912541b0 KS |
477 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX) |
478 | return ctrl_msg->ctrl_msg_wire.intval; | |
479 | return -1; | |
d59f11e1 | 480 | } |
bb38678e | 481 | |
ff2c503d | 482 | int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) |
bb38678e | 483 | { |
912541b0 KS |
484 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING) |
485 | return 1; | |
486 | return -1; | |
ff2c503d KS |
487 | } |
488 | ||
489 | int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) | |
490 | { | |
912541b0 KS |
491 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT) |
492 | return 1; | |
493 | return -1; | |
bb38678e | 494 | } |