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Commit | Line | Data |
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d9215cd8 ZJS |
1 | /* SPDX-License-Identifier: LGPL-2.1+ |
2 | * | |
55e9959b | 3 | * libudev - interface to udev device information |
d59f11e1 | 4 | * |
4061ab9f KS |
5 | * This library is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU Lesser General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2.1 of the License, or (at your option) any later version. | |
d59f11e1 KS |
9 | */ |
10 | ||
d59f11e1 | 11 | #include <errno.h> |
cf0fbc49 | 12 | #include <poll.h> |
d59f11e1 | 13 | #include <stddef.h> |
cf0fbc49 | 14 | #include <stdlib.h> |
d59f11e1 | 15 | #include <string.h> |
d59f11e1 KS |
16 | #include <sys/socket.h> |
17 | #include <sys/un.h> | |
cf0fbc49 | 18 | #include <unistd.h> |
d59f11e1 | 19 | |
b5efdb8a | 20 | #include "alloc-util.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
f97b34a6 | 22 | #include "format-util.h" |
3ffd4af2 | 23 | #include "socket-util.h" |
c15d02e5 | 24 | #include "udev.h" |
d59f11e1 | 25 | |
540f4669 | 26 | /* wire protocol magic must match */ |
912541b0 | 27 | #define UDEV_CTRL_MAGIC 0xdead1dea |
d59f11e1 KS |
28 | |
29 | enum udev_ctrl_msg_type { | |
912541b0 KS |
30 | UDEV_CTRL_UNKNOWN, |
31 | UDEV_CTRL_SET_LOG_LEVEL, | |
32 | UDEV_CTRL_STOP_EXEC_QUEUE, | |
33 | UDEV_CTRL_START_EXEC_QUEUE, | |
34 | UDEV_CTRL_RELOAD, | |
35 | UDEV_CTRL_SET_ENV, | |
36 | UDEV_CTRL_SET_CHILDREN_MAX, | |
37 | UDEV_CTRL_PING, | |
38 | UDEV_CTRL_EXIT, | |
d59f11e1 KS |
39 | }; |
40 | ||
b692a750 | 41 | struct udev_ctrl_msg_wire { |
912541b0 KS |
42 | char version[16]; |
43 | unsigned int magic; | |
44 | enum udev_ctrl_msg_type type; | |
45 | union { | |
46 | int intval; | |
47 | char buf[256]; | |
48 | }; | |
d59f11e1 KS |
49 | }; |
50 | ||
51 | struct udev_ctrl_msg { | |
912541b0 KS |
52 | int refcount; |
53 | struct udev_ctrl_connection *conn; | |
54 | struct udev_ctrl_msg_wire ctrl_msg_wire; | |
d59f11e1 KS |
55 | }; |
56 | ||
57 | struct udev_ctrl { | |
912541b0 KS |
58 | int refcount; |
59 | struct udev *udev; | |
60 | int sock; | |
6421348d | 61 | union sockaddr_union saddr; |
912541b0 KS |
62 | socklen_t addrlen; |
63 | bool bound; | |
64 | bool cleanup_socket; | |
65 | bool connected; | |
ff2c503d KS |
66 | }; |
67 | ||
68 | struct udev_ctrl_connection { | |
912541b0 KS |
69 | int refcount; |
70 | struct udev_ctrl *uctrl; | |
71 | int sock; | |
d59f11e1 KS |
72 | }; |
73 | ||
9ec6e95b | 74 | struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) { |
912541b0 | 75 | struct udev_ctrl *uctrl; |
b97caef5 | 76 | const int on = 1; |
4bbdff75 | 77 | int r; |
912541b0 | 78 | |
955d98c9 | 79 | uctrl = new0(struct udev_ctrl, 1); |
912541b0 KS |
80 | if (uctrl == NULL) |
81 | return NULL; | |
82 | uctrl->refcount = 1; | |
83 | uctrl->udev = udev; | |
84 | ||
85 | if (fd < 0) { | |
86 | uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
87 | if (uctrl->sock < 0) { | |
56f64d95 | 88 | log_error_errno(errno, "error getting socket: %m"); |
912541b0 KS |
89 | udev_ctrl_unref(uctrl); |
90 | return NULL; | |
91 | } | |
92 | } else { | |
93 | uctrl->bound = true; | |
94 | uctrl->sock = fd; | |
95 | } | |
25568304 KS |
96 | |
97 | /* | |
98 | * FIXME: remove it as soon as we can depend on this: | |
99 | * http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=90c6bd34f884cd9cee21f1d152baf6c18bcac949 | |
100 | */ | |
4bbdff75 TG |
101 | r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
102 | if (r < 0) | |
56f64d95 | 103 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
912541b0 | 104 | |
6421348d SL |
105 | uctrl->saddr.un.sun_family = AF_LOCAL; |
106 | strscpy(uctrl->saddr.un.sun_path, sizeof(uctrl->saddr.un.sun_path), "/run/udev/control"); | |
fc2fffe7 | 107 | uctrl->addrlen = SOCKADDR_UN_LEN(uctrl->saddr.un); |
912541b0 | 108 | return uctrl; |
fc1de713 KS |
109 | } |
110 | ||
9ec6e95b | 111 | struct udev_ctrl *udev_ctrl_new(struct udev *udev) { |
912541b0 | 112 | return udev_ctrl_new_from_fd(udev, -1); |
d59f11e1 KS |
113 | } |
114 | ||
9ec6e95b | 115 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) { |
912541b0 KS |
116 | int err; |
117 | ||
118 | if (!uctrl->bound) { | |
6421348d | 119 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); |
912541b0 | 120 | if (err < 0 && errno == EADDRINUSE) { |
6421348d SL |
121 | unlink(uctrl->saddr.un.sun_path); |
122 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); | |
912541b0 KS |
123 | } |
124 | ||
ece174c5 | 125 | if (err < 0) |
76ef789d | 126 | return log_error_errno(errno, "bind failed: %m"); |
912541b0 KS |
127 | |
128 | err = listen(uctrl->sock, 0); | |
ece174c5 | 129 | if (err < 0) |
76ef789d | 130 | return log_error_errno(errno, "listen failed: %m"); |
912541b0 KS |
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) { |
35927d13 TG |
143 | if (uctrl) |
144 | uctrl->refcount++; | |
145 | ||
912541b0 | 146 | return uctrl; |
d59f11e1 KS |
147 | } |
148 | ||
9ec6e95b | 149 | struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) { |
35927d13 TG |
150 | if (uctrl && -- uctrl->refcount == 0) { |
151 | if (uctrl->sock >= 0) | |
152 | close(uctrl->sock); | |
153 | free(uctrl); | |
154 | } | |
155 | ||
912541b0 | 156 | return NULL; |
d59f11e1 KS |
157 | } |
158 | ||
9ec6e95b | 159 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) { |
912541b0 KS |
160 | if (uctrl == NULL) |
161 | return 0; | |
162 | if (uctrl->cleanup_socket) | |
6421348d | 163 | unlink(uctrl->saddr.un.sun_path); |
912541b0 | 164 | return 0; |
1f5a5100 KS |
165 | } |
166 | ||
9ec6e95b | 167 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) { |
912541b0 KS |
168 | if (uctrl == NULL) |
169 | return -EINVAL; | |
170 | return uctrl->sock; | |
d59f11e1 KS |
171 | } |
172 | ||
9ec6e95b | 173 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) { |
912541b0 | 174 | struct udev_ctrl_connection *conn; |
39883f62 | 175 | struct ucred ucred = {}; |
912541b0 | 176 | const int on = 1; |
eff05270 | 177 | int r; |
912541b0 | 178 | |
eff05270 | 179 | conn = new(struct udev_ctrl_connection, 1); |
912541b0 KS |
180 | if (conn == NULL) |
181 | return NULL; | |
182 | conn->refcount = 1; | |
183 | conn->uctrl = uctrl; | |
184 | ||
185 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
186 | if (conn->sock < 0) { | |
187 | if (errno != EINTR) | |
56f64d95 | 188 | log_error_errno(errno, "unable to receive ctrl connection: %m"); |
912541b0 KS |
189 | goto err; |
190 | } | |
191 | ||
192 | /* check peer credential of connection */ | |
eff05270 LP |
193 | r = getpeercred(conn->sock, &ucred); |
194 | if (r < 0) { | |
da927ba9 | 195 | log_error_errno(r, "unable to receive credentials of ctrl connection: %m"); |
912541b0 KS |
196 | goto err; |
197 | } | |
198 | if (ucred.uid > 0) { | |
1fa2f38f | 199 | log_error("sender uid="UID_FMT", message ignored", ucred.uid); |
912541b0 KS |
200 | goto err; |
201 | } | |
202 | ||
203 | /* enable receiving of the sender credentials in the messages */ | |
4bbdff75 TG |
204 | r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
205 | if (r < 0) | |
56f64d95 | 206 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
4bbdff75 | 207 | |
912541b0 KS |
208 | udev_ctrl_ref(uctrl); |
209 | return conn; | |
2c64f589 | 210 | err: |
912541b0 KS |
211 | if (conn->sock >= 0) |
212 | close(conn->sock); | |
6b430fdb | 213 | return mfree(conn); |
ff2c503d KS |
214 | } |
215 | ||
9ec6e95b | 216 | struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) { |
912541b0 KS |
217 | if (conn == NULL) |
218 | return NULL; | |
219 | conn->refcount++; | |
220 | return conn; | |
ff2c503d KS |
221 | } |
222 | ||
9ec6e95b | 223 | struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) { |
35927d13 TG |
224 | if (conn && -- conn->refcount == 0) { |
225 | if (conn->sock >= 0) | |
226 | close(conn->sock); | |
227 | ||
228 | udev_ctrl_unref(conn->uctrl); | |
229 | ||
230 | free(conn); | |
231 | } | |
232 | ||
912541b0 | 233 | return NULL; |
ff2c503d KS |
234 | } |
235 | ||
9ec6e95b | 236 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) { |
912541b0 KS |
237 | struct udev_ctrl_msg_wire ctrl_msg_wire; |
238 | int err = 0; | |
239 | ||
29804cc1 | 240 | memzero(&ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire)); |
948aaa7c | 241 | strcpy(ctrl_msg_wire.version, "udev-" PACKAGE_VERSION); |
912541b0 KS |
242 | ctrl_msg_wire.magic = UDEV_CTRL_MAGIC; |
243 | ctrl_msg_wire.type = type; | |
244 | ||
245 | if (buf != NULL) | |
d5a89d7d | 246 | strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); |
912541b0 KS |
247 | else |
248 | ctrl_msg_wire.intval = intval; | |
249 | ||
250 | if (!uctrl->connected) { | |
6421348d | 251 | if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) { |
912541b0 KS |
252 | err = -errno; |
253 | goto out; | |
254 | } | |
255 | uctrl->connected = true; | |
256 | } | |
257 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) { | |
258 | err = -errno; | |
259 | goto out; | |
260 | } | |
261 | ||
262 | /* wait for peer message handling or disconnect */ | |
263 | for (;;) { | |
264 | struct pollfd pfd[1]; | |
265 | int r; | |
266 | ||
267 | pfd[0].fd = uctrl->sock; | |
268 | pfd[0].events = POLLIN; | |
9ea28c55 | 269 | r = poll(pfd, 1, timeout * MSEC_PER_SEC); |
912541b0 KS |
270 | if (r < 0) { |
271 | if (errno == EINTR) | |
272 | continue; | |
273 | err = -errno; | |
274 | break; | |
275 | } | |
276 | ||
277 | if (r > 0 && pfd[0].revents & POLLERR) { | |
278 | err = -EIO; | |
279 | break; | |
280 | } | |
281 | ||
282 | if (r == 0) | |
283 | err = -ETIMEDOUT; | |
284 | break; | |
285 | } | |
ff2c503d | 286 | out: |
912541b0 | 287 | return err; |
d59f11e1 KS |
288 | } |
289 | ||
9ec6e95b | 290 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) { |
912541b0 | 291 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
292 | } |
293 | ||
9ec6e95b | 294 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 295 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
296 | } |
297 | ||
9ec6e95b | 298 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 299 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
300 | } |
301 | ||
9ec6e95b | 302 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 303 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
304 | } |
305 | ||
9ec6e95b | 306 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) { |
912541b0 | 307 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
308 | } |
309 | ||
9ec6e95b | 310 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) { |
912541b0 | 311 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
312 | } |
313 | ||
9ec6e95b | 314 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 315 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
316 | } |
317 | ||
9ec6e95b | 318 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 319 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
320 | } |
321 | ||
9ec6e95b | 322 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) { |
912541b0 KS |
323 | struct udev_ctrl_msg *uctrl_msg; |
324 | ssize_t size; | |
912541b0 KS |
325 | struct cmsghdr *cmsg; |
326 | struct iovec iov; | |
912541b0 | 327 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
97fec53e ZJS |
328 | struct msghdr smsg = { |
329 | .msg_iov = &iov, | |
330 | .msg_iovlen = 1, | |
331 | .msg_control = cred_msg, | |
332 | .msg_controllen = sizeof(cred_msg), | |
333 | }; | |
334 | struct ucred *cred; | |
912541b0 | 335 | |
97fec53e | 336 | uctrl_msg = new0(struct udev_ctrl_msg, 1); |
912541b0 KS |
337 | if (uctrl_msg == NULL) |
338 | return NULL; | |
339 | uctrl_msg->refcount = 1; | |
340 | uctrl_msg->conn = conn; | |
341 | udev_ctrl_connection_ref(conn); | |
342 | ||
343 | /* wait for the incoming message */ | |
f168c273 | 344 | for (;;) { |
912541b0 KS |
345 | struct pollfd pfd[1]; |
346 | int r; | |
347 | ||
348 | pfd[0].fd = conn->sock; | |
349 | pfd[0].events = POLLIN; | |
350 | ||
351 | r = poll(pfd, 1, 10000); | |
352 | if (r < 0) { | |
353 | if (errno == EINTR) | |
354 | continue; | |
355 | goto err; | |
356 | } else if (r == 0) { | |
9f6445e3 | 357 | log_error("timeout waiting for ctrl message"); |
912541b0 KS |
358 | goto err; |
359 | } else { | |
360 | if (!(pfd[0].revents & POLLIN)) { | |
56f64d95 | 361 | log_error_errno(errno, "ctrl connection error: %m"); |
912541b0 KS |
362 | goto err; |
363 | } | |
364 | } | |
365 | ||
366 | break; | |
367 | } | |
368 | ||
369 | iov.iov_base = &uctrl_msg->ctrl_msg_wire; | |
370 | iov.iov_len = sizeof(struct udev_ctrl_msg_wire); | |
97fec53e | 371 | |
a38d9945 | 372 | size = recvmsg(conn->sock, &smsg, 0); |
912541b0 | 373 | if (size < 0) { |
56f64d95 | 374 | log_error_errno(errno, "unable to receive ctrl message: %m"); |
912541b0 KS |
375 | goto err; |
376 | } | |
1c8da044 LP |
377 | |
378 | cmsg_close_all(&smsg); | |
379 | ||
912541b0 | 380 | cmsg = CMSG_FIRSTHDR(&smsg); |
912541b0 KS |
381 | |
382 | if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { | |
9f6445e3 | 383 | log_error("no sender credentials received, message ignored"); |
912541b0 KS |
384 | goto err; |
385 | } | |
386 | ||
93b1da85 KZ |
387 | cred = (struct ucred *) CMSG_DATA(cmsg); |
388 | ||
912541b0 | 389 | if (cred->uid != 0) { |
1fa2f38f | 390 | log_error("sender uid="UID_FMT", message ignored", cred->uid); |
912541b0 KS |
391 | goto err; |
392 | } | |
393 | ||
394 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
9f6445e3 | 395 | log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic); |
912541b0 KS |
396 | goto err; |
397 | } | |
398 | ||
912541b0 | 399 | return uctrl_msg; |
d59f11e1 | 400 | err: |
912541b0 KS |
401 | udev_ctrl_msg_unref(uctrl_msg); |
402 | return NULL; | |
d59f11e1 KS |
403 | } |
404 | ||
9ec6e95b | 405 | struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) { |
35927d13 TG |
406 | if (ctrl_msg && -- ctrl_msg->refcount == 0) { |
407 | udev_ctrl_connection_unref(ctrl_msg->conn); | |
408 | free(ctrl_msg); | |
409 | } | |
410 | ||
912541b0 | 411 | return NULL; |
d59f11e1 KS |
412 | } |
413 | ||
9ec6e95b | 414 | int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
415 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL) |
416 | return ctrl_msg->ctrl_msg_wire.intval; | |
417 | return -1; | |
d59f11e1 KS |
418 | } |
419 | ||
9ec6e95b | 420 | int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
421 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE) |
422 | return 1; | |
423 | return -1; | |
d59f11e1 KS |
424 | } |
425 | ||
9ec6e95b | 426 | int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
427 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE) |
428 | return 1; | |
429 | return -1; | |
d59f11e1 KS |
430 | } |
431 | ||
9ec6e95b | 432 | int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
433 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD) |
434 | return 1; | |
435 | return -1; | |
d59f11e1 KS |
436 | } |
437 | ||
9ec6e95b | 438 | const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
439 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV) |
440 | return ctrl_msg->ctrl_msg_wire.buf; | |
441 | return NULL; | |
d59f11e1 KS |
442 | } |
443 | ||
9ec6e95b | 444 | int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
445 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX) |
446 | return ctrl_msg->ctrl_msg_wire.intval; | |
447 | return -1; | |
d59f11e1 | 448 | } |
bb38678e | 449 | |
9ec6e95b | 450 | int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
451 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING) |
452 | return 1; | |
453 | return -1; | |
ff2c503d KS |
454 | } |
455 | ||
9ec6e95b | 456 | int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
457 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT) |
458 | return 1; | |
459 | return -1; | |
bb38678e | 460 | } |