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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 | ||
9ec6e95b | 73 | struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) { |
912541b0 | 74 | struct udev_ctrl *uctrl; |
b97caef5 | 75 | const int on = 1; |
4bbdff75 | 76 | int r; |
912541b0 | 77 | |
955d98c9 | 78 | uctrl = new0(struct udev_ctrl, 1); |
912541b0 KS |
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) { | |
56f64d95 | 87 | log_error_errno(errno, "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 | } | |
4bbdff75 TG |
95 | r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
96 | if (r < 0) | |
56f64d95 | 97 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
912541b0 KS |
98 | |
99 | uctrl->saddr.sun_family = AF_LOCAL; | |
d5a89d7d | 100 | strscpy(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path), "/run/udev/control"); |
912541b0 KS |
101 | uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path); |
102 | return uctrl; | |
fc1de713 KS |
103 | } |
104 | ||
9ec6e95b | 105 | struct udev_ctrl *udev_ctrl_new(struct udev *udev) { |
912541b0 | 106 | return udev_ctrl_new_from_fd(udev, -1); |
d59f11e1 KS |
107 | } |
108 | ||
9ec6e95b | 109 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) { |
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; | |
56f64d95 | 121 | log_error_errno(errno, "bind failed: %m"); |
912541b0 KS |
122 | return err; |
123 | } | |
124 | ||
125 | err = listen(uctrl->sock, 0); | |
126 | if (err < 0) { | |
127 | err = -errno; | |
56f64d95 | 128 | log_error_errno(errno, "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 | ||
9ec6e95b | 138 | struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl) { |
912541b0 | 139 | return uctrl->udev; |
d59f11e1 KS |
140 | } |
141 | ||
9ec6e95b | 142 | static struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl) { |
912541b0 KS |
143 | if (uctrl == NULL) |
144 | return NULL; | |
145 | uctrl->refcount++; | |
146 | return uctrl; | |
d59f11e1 KS |
147 | } |
148 | ||
9ec6e95b | 149 | struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) { |
912541b0 KS |
150 | if (uctrl == NULL) |
151 | return NULL; | |
152 | uctrl->refcount--; | |
153 | if (uctrl->refcount > 0) | |
154 | return uctrl; | |
155 | if (uctrl->sock >= 0) | |
156 | close(uctrl->sock); | |
157 | free(uctrl); | |
158 | return NULL; | |
d59f11e1 KS |
159 | } |
160 | ||
9ec6e95b | 161 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) { |
912541b0 KS |
162 | if (uctrl == NULL) |
163 | return 0; | |
164 | if (uctrl->cleanup_socket) | |
165 | unlink(uctrl->saddr.sun_path); | |
166 | return 0; | |
1f5a5100 KS |
167 | } |
168 | ||
9ec6e95b | 169 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) { |
912541b0 KS |
170 | if (uctrl == NULL) |
171 | return -EINVAL; | |
172 | return uctrl->sock; | |
d59f11e1 KS |
173 | } |
174 | ||
9ec6e95b | 175 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) { |
912541b0 | 176 | struct udev_ctrl_connection *conn; |
39883f62 | 177 | struct ucred ucred = {}; |
912541b0 | 178 | const int on = 1; |
eff05270 | 179 | int r; |
912541b0 | 180 | |
eff05270 | 181 | conn = new(struct udev_ctrl_connection, 1); |
912541b0 KS |
182 | if (conn == NULL) |
183 | return NULL; | |
184 | conn->refcount = 1; | |
185 | conn->uctrl = uctrl; | |
186 | ||
187 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
188 | if (conn->sock < 0) { | |
189 | if (errno != EINTR) | |
56f64d95 | 190 | log_error_errno(errno, "unable to receive ctrl connection: %m"); |
912541b0 KS |
191 | goto err; |
192 | } | |
193 | ||
194 | /* check peer credential of connection */ | |
eff05270 LP |
195 | r = getpeercred(conn->sock, &ucred); |
196 | if (r < 0) { | |
da927ba9 | 197 | log_error_errno(r, "unable to receive credentials of ctrl connection: %m"); |
912541b0 KS |
198 | goto err; |
199 | } | |
200 | if (ucred.uid > 0) { | |
9f6445e3 | 201 | log_error("sender uid=%i, message ignored", ucred.uid); |
912541b0 KS |
202 | goto err; |
203 | } | |
204 | ||
205 | /* enable receiving of the sender credentials in the messages */ | |
4bbdff75 TG |
206 | r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
207 | if (r < 0) | |
56f64d95 | 208 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
4bbdff75 | 209 | |
912541b0 KS |
210 | udev_ctrl_ref(uctrl); |
211 | return conn; | |
2c64f589 | 212 | err: |
912541b0 KS |
213 | if (conn->sock >= 0) |
214 | close(conn->sock); | |
215 | free(conn); | |
216 | return NULL; | |
ff2c503d KS |
217 | } |
218 | ||
9ec6e95b | 219 | struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) { |
912541b0 KS |
220 | if (conn == NULL) |
221 | return NULL; | |
222 | conn->refcount++; | |
223 | return conn; | |
ff2c503d KS |
224 | } |
225 | ||
9ec6e95b | 226 | struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) { |
912541b0 KS |
227 | if (conn == NULL) |
228 | return NULL; | |
229 | conn->refcount--; | |
230 | if (conn->refcount > 0) | |
231 | return conn; | |
232 | if (conn->sock >= 0) | |
233 | close(conn->sock); | |
234 | udev_ctrl_unref(conn->uctrl); | |
235 | free(conn); | |
236 | return NULL; | |
ff2c503d KS |
237 | } |
238 | ||
9ec6e95b | 239 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) { |
912541b0 KS |
240 | struct udev_ctrl_msg_wire ctrl_msg_wire; |
241 | int err = 0; | |
242 | ||
29804cc1 | 243 | memzero(&ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire)); |
912541b0 KS |
244 | strcpy(ctrl_msg_wire.version, "udev-" VERSION); |
245 | ctrl_msg_wire.magic = UDEV_CTRL_MAGIC; | |
246 | ctrl_msg_wire.type = type; | |
247 | ||
248 | if (buf != NULL) | |
d5a89d7d | 249 | strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); |
912541b0 KS |
250 | else |
251 | ctrl_msg_wire.intval = intval; | |
252 | ||
253 | if (!uctrl->connected) { | |
254 | if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) { | |
255 | err = -errno; | |
256 | goto out; | |
257 | } | |
258 | uctrl->connected = true; | |
259 | } | |
260 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) { | |
261 | err = -errno; | |
262 | goto out; | |
263 | } | |
264 | ||
265 | /* wait for peer message handling or disconnect */ | |
266 | for (;;) { | |
267 | struct pollfd pfd[1]; | |
268 | int r; | |
269 | ||
270 | pfd[0].fd = uctrl->sock; | |
271 | pfd[0].events = POLLIN; | |
9ea28c55 | 272 | r = poll(pfd, 1, timeout * MSEC_PER_SEC); |
912541b0 KS |
273 | if (r < 0) { |
274 | if (errno == EINTR) | |
275 | continue; | |
276 | err = -errno; | |
277 | break; | |
278 | } | |
279 | ||
280 | if (r > 0 && pfd[0].revents & POLLERR) { | |
281 | err = -EIO; | |
282 | break; | |
283 | } | |
284 | ||
285 | if (r == 0) | |
286 | err = -ETIMEDOUT; | |
287 | break; | |
288 | } | |
ff2c503d | 289 | out: |
912541b0 | 290 | return err; |
d59f11e1 KS |
291 | } |
292 | ||
9ec6e95b | 293 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) { |
912541b0 | 294 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
295 | } |
296 | ||
9ec6e95b | 297 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 298 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
299 | } |
300 | ||
9ec6e95b | 301 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 302 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
303 | } |
304 | ||
9ec6e95b | 305 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 306 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
307 | } |
308 | ||
9ec6e95b | 309 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) { |
912541b0 | 310 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
311 | } |
312 | ||
9ec6e95b | 313 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) { |
912541b0 | 314 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
315 | } |
316 | ||
9ec6e95b | 317 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 318 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
319 | } |
320 | ||
9ec6e95b | 321 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 322 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
323 | } |
324 | ||
9ec6e95b | 325 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) { |
912541b0 KS |
326 | struct udev_ctrl_msg *uctrl_msg; |
327 | ssize_t size; | |
912541b0 KS |
328 | struct cmsghdr *cmsg; |
329 | struct iovec iov; | |
912541b0 | 330 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
97fec53e ZJS |
331 | struct msghdr smsg = { |
332 | .msg_iov = &iov, | |
333 | .msg_iovlen = 1, | |
334 | .msg_control = cred_msg, | |
335 | .msg_controllen = sizeof(cred_msg), | |
336 | }; | |
337 | struct ucred *cred; | |
912541b0 | 338 | |
97fec53e | 339 | uctrl_msg = new0(struct udev_ctrl_msg, 1); |
912541b0 KS |
340 | if (uctrl_msg == NULL) |
341 | return NULL; | |
342 | uctrl_msg->refcount = 1; | |
343 | uctrl_msg->conn = conn; | |
344 | udev_ctrl_connection_ref(conn); | |
345 | ||
346 | /* wait for the incoming message */ | |
f168c273 | 347 | for (;;) { |
912541b0 KS |
348 | struct pollfd pfd[1]; |
349 | int r; | |
350 | ||
351 | pfd[0].fd = conn->sock; | |
352 | pfd[0].events = POLLIN; | |
353 | ||
354 | r = poll(pfd, 1, 10000); | |
355 | if (r < 0) { | |
356 | if (errno == EINTR) | |
357 | continue; | |
358 | goto err; | |
359 | } else if (r == 0) { | |
9f6445e3 | 360 | log_error("timeout waiting for ctrl message"); |
912541b0 KS |
361 | goto err; |
362 | } else { | |
363 | if (!(pfd[0].revents & POLLIN)) { | |
56f64d95 | 364 | log_error_errno(errno, "ctrl connection error: %m"); |
912541b0 KS |
365 | goto err; |
366 | } | |
367 | } | |
368 | ||
369 | break; | |
370 | } | |
371 | ||
372 | iov.iov_base = &uctrl_msg->ctrl_msg_wire; | |
373 | iov.iov_len = sizeof(struct udev_ctrl_msg_wire); | |
97fec53e | 374 | |
912541b0 KS |
375 | size = recvmsg(conn->sock, &smsg, 0); |
376 | if (size < 0) { | |
56f64d95 | 377 | log_error_errno(errno, "unable to receive ctrl message: %m"); |
912541b0 KS |
378 | goto err; |
379 | } | |
380 | cmsg = CMSG_FIRSTHDR(&smsg); | |
381 | cred = (struct ucred *) CMSG_DATA(cmsg); | |
382 | ||
383 | if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { | |
9f6445e3 | 384 | log_error("no sender credentials received, message ignored"); |
912541b0 KS |
385 | goto err; |
386 | } | |
387 | ||
388 | if (cred->uid != 0) { | |
9f6445e3 | 389 | log_error("sender uid=%i, message ignored", cred->uid); |
912541b0 KS |
390 | goto err; |
391 | } | |
392 | ||
393 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
9f6445e3 | 394 | log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic); |
912541b0 KS |
395 | goto err; |
396 | } | |
397 | ||
912541b0 | 398 | return uctrl_msg; |
d59f11e1 | 399 | err: |
912541b0 KS |
400 | udev_ctrl_msg_unref(uctrl_msg); |
401 | return NULL; | |
d59f11e1 KS |
402 | } |
403 | ||
9ec6e95b | 404 | struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
405 | if (ctrl_msg == NULL) |
406 | return NULL; | |
407 | ctrl_msg->refcount--; | |
408 | if (ctrl_msg->refcount > 0) | |
409 | return ctrl_msg; | |
912541b0 KS |
410 | udev_ctrl_connection_unref(ctrl_msg->conn); |
411 | free(ctrl_msg); | |
412 | return NULL; | |
d59f11e1 KS |
413 | } |
414 | ||
9ec6e95b | 415 | int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
416 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL) |
417 | return ctrl_msg->ctrl_msg_wire.intval; | |
418 | return -1; | |
d59f11e1 KS |
419 | } |
420 | ||
9ec6e95b | 421 | int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
422 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE) |
423 | return 1; | |
424 | return -1; | |
d59f11e1 KS |
425 | } |
426 | ||
9ec6e95b | 427 | int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
428 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE) |
429 | return 1; | |
430 | return -1; | |
d59f11e1 KS |
431 | } |
432 | ||
9ec6e95b | 433 | int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
434 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD) |
435 | return 1; | |
436 | return -1; | |
d59f11e1 KS |
437 | } |
438 | ||
9ec6e95b | 439 | const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
440 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV) |
441 | return ctrl_msg->ctrl_msg_wire.buf; | |
442 | return NULL; | |
d59f11e1 KS |
443 | } |
444 | ||
9ec6e95b | 445 | int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
446 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX) |
447 | return ctrl_msg->ctrl_msg_wire.intval; | |
448 | return -1; | |
d59f11e1 | 449 | } |
bb38678e | 450 | |
9ec6e95b | 451 | int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
452 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING) |
453 | return 1; | |
454 | return -1; | |
ff2c503d KS |
455 | } |
456 | ||
9ec6e95b | 457 | int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
458 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT) |
459 | return 1; | |
460 | return -1; | |
bb38678e | 461 | } |