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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 | 12 | #include <errno.h> |
cf0fbc49 | 13 | #include <poll.h> |
d59f11e1 | 14 | #include <stddef.h> |
cf0fbc49 | 15 | #include <stdlib.h> |
d59f11e1 | 16 | #include <string.h> |
d59f11e1 KS |
17 | #include <sys/socket.h> |
18 | #include <sys/un.h> | |
cf0fbc49 | 19 | #include <unistd.h> |
d59f11e1 | 20 | |
b5efdb8a | 21 | #include "alloc-util.h" |
3ffd4af2 | 22 | #include "fd-util.h" |
6482f626 | 23 | #include "formats-util.h" |
3ffd4af2 | 24 | #include "socket-util.h" |
c15d02e5 | 25 | #include "udev.h" |
d59f11e1 | 26 | |
540f4669 | 27 | /* wire protocol magic must match */ |
912541b0 | 28 | #define UDEV_CTRL_MAGIC 0xdead1dea |
d59f11e1 KS |
29 | |
30 | enum udev_ctrl_msg_type { | |
912541b0 KS |
31 | UDEV_CTRL_UNKNOWN, |
32 | UDEV_CTRL_SET_LOG_LEVEL, | |
33 | UDEV_CTRL_STOP_EXEC_QUEUE, | |
34 | UDEV_CTRL_START_EXEC_QUEUE, | |
35 | UDEV_CTRL_RELOAD, | |
36 | UDEV_CTRL_SET_ENV, | |
37 | UDEV_CTRL_SET_CHILDREN_MAX, | |
38 | UDEV_CTRL_PING, | |
39 | UDEV_CTRL_EXIT, | |
d59f11e1 KS |
40 | }; |
41 | ||
b692a750 | 42 | struct udev_ctrl_msg_wire { |
912541b0 KS |
43 | char version[16]; |
44 | unsigned int magic; | |
45 | enum udev_ctrl_msg_type type; | |
46 | union { | |
47 | int intval; | |
48 | char buf[256]; | |
49 | }; | |
d59f11e1 KS |
50 | }; |
51 | ||
52 | struct udev_ctrl_msg { | |
912541b0 KS |
53 | int refcount; |
54 | struct udev_ctrl_connection *conn; | |
55 | struct udev_ctrl_msg_wire ctrl_msg_wire; | |
d59f11e1 KS |
56 | }; |
57 | ||
58 | struct udev_ctrl { | |
912541b0 KS |
59 | int refcount; |
60 | struct udev *udev; | |
61 | int sock; | |
6421348d | 62 | union sockaddr_union saddr; |
912541b0 KS |
63 | socklen_t addrlen; |
64 | bool bound; | |
65 | bool cleanup_socket; | |
66 | bool connected; | |
ff2c503d KS |
67 | }; |
68 | ||
69 | struct udev_ctrl_connection { | |
912541b0 KS |
70 | int refcount; |
71 | struct udev_ctrl *uctrl; | |
72 | int sock; | |
d59f11e1 KS |
73 | }; |
74 | ||
9ec6e95b | 75 | struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) { |
912541b0 | 76 | struct udev_ctrl *uctrl; |
b97caef5 | 77 | const int on = 1; |
4bbdff75 | 78 | int r; |
912541b0 | 79 | |
955d98c9 | 80 | uctrl = new0(struct udev_ctrl, 1); |
912541b0 KS |
81 | if (uctrl == NULL) |
82 | return NULL; | |
83 | uctrl->refcount = 1; | |
84 | uctrl->udev = udev; | |
85 | ||
86 | if (fd < 0) { | |
87 | uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
88 | if (uctrl->sock < 0) { | |
56f64d95 | 89 | log_error_errno(errno, "error getting socket: %m"); |
912541b0 KS |
90 | udev_ctrl_unref(uctrl); |
91 | return NULL; | |
92 | } | |
93 | } else { | |
94 | uctrl->bound = true; | |
95 | uctrl->sock = fd; | |
96 | } | |
25568304 KS |
97 | |
98 | /* | |
99 | * FIXME: remove it as soon as we can depend on this: | |
100 | * http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=90c6bd34f884cd9cee21f1d152baf6c18bcac949 | |
101 | */ | |
4bbdff75 TG |
102 | r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
103 | if (r < 0) | |
56f64d95 | 104 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
912541b0 | 105 | |
6421348d SL |
106 | uctrl->saddr.un.sun_family = AF_LOCAL; |
107 | strscpy(uctrl->saddr.un.sun_path, sizeof(uctrl->saddr.un.sun_path), "/run/udev/control"); | |
fc2fffe7 | 108 | uctrl->addrlen = SOCKADDR_UN_LEN(uctrl->saddr.un); |
912541b0 | 109 | return uctrl; |
fc1de713 KS |
110 | } |
111 | ||
9ec6e95b | 112 | struct udev_ctrl *udev_ctrl_new(struct udev *udev) { |
912541b0 | 113 | return udev_ctrl_new_from_fd(udev, -1); |
d59f11e1 KS |
114 | } |
115 | ||
9ec6e95b | 116 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) { |
912541b0 KS |
117 | int err; |
118 | ||
119 | if (!uctrl->bound) { | |
6421348d | 120 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); |
912541b0 | 121 | if (err < 0 && errno == EADDRINUSE) { |
6421348d SL |
122 | unlink(uctrl->saddr.un.sun_path); |
123 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); | |
912541b0 KS |
124 | } |
125 | ||
ece174c5 | 126 | if (err < 0) |
76ef789d | 127 | return log_error_errno(errno, "bind failed: %m"); |
912541b0 KS |
128 | |
129 | err = listen(uctrl->sock, 0); | |
ece174c5 | 130 | if (err < 0) |
76ef789d | 131 | return log_error_errno(errno, "listen failed: %m"); |
912541b0 KS |
132 | |
133 | uctrl->bound = true; | |
134 | uctrl->cleanup_socket = true; | |
135 | } | |
136 | return 0; | |
d59f11e1 KS |
137 | } |
138 | ||
9ec6e95b | 139 | struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl) { |
912541b0 | 140 | return uctrl->udev; |
d59f11e1 KS |
141 | } |
142 | ||
9ec6e95b | 143 | static struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl) { |
35927d13 TG |
144 | if (uctrl) |
145 | uctrl->refcount++; | |
146 | ||
912541b0 | 147 | return uctrl; |
d59f11e1 KS |
148 | } |
149 | ||
9ec6e95b | 150 | struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) { |
35927d13 TG |
151 | if (uctrl && -- uctrl->refcount == 0) { |
152 | if (uctrl->sock >= 0) | |
153 | close(uctrl->sock); | |
154 | free(uctrl); | |
155 | } | |
156 | ||
912541b0 | 157 | return NULL; |
d59f11e1 KS |
158 | } |
159 | ||
9ec6e95b | 160 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) { |
912541b0 KS |
161 | if (uctrl == NULL) |
162 | return 0; | |
163 | if (uctrl->cleanup_socket) | |
6421348d | 164 | unlink(uctrl->saddr.un.sun_path); |
912541b0 | 165 | return 0; |
1f5a5100 KS |
166 | } |
167 | ||
9ec6e95b | 168 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) { |
912541b0 KS |
169 | if (uctrl == NULL) |
170 | return -EINVAL; | |
171 | return uctrl->sock; | |
d59f11e1 KS |
172 | } |
173 | ||
9ec6e95b | 174 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) { |
912541b0 | 175 | struct udev_ctrl_connection *conn; |
39883f62 | 176 | struct ucred ucred = {}; |
912541b0 | 177 | const int on = 1; |
eff05270 | 178 | int r; |
912541b0 | 179 | |
eff05270 | 180 | conn = new(struct udev_ctrl_connection, 1); |
912541b0 KS |
181 | if (conn == NULL) |
182 | return NULL; | |
183 | conn->refcount = 1; | |
184 | conn->uctrl = uctrl; | |
185 | ||
186 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
187 | if (conn->sock < 0) { | |
188 | if (errno != EINTR) | |
56f64d95 | 189 | log_error_errno(errno, "unable to receive ctrl connection: %m"); |
912541b0 KS |
190 | goto err; |
191 | } | |
192 | ||
193 | /* check peer credential of connection */ | |
eff05270 LP |
194 | r = getpeercred(conn->sock, &ucred); |
195 | if (r < 0) { | |
da927ba9 | 196 | log_error_errno(r, "unable to receive credentials of ctrl connection: %m"); |
912541b0 KS |
197 | goto err; |
198 | } | |
199 | if (ucred.uid > 0) { | |
1fa2f38f | 200 | log_error("sender uid="UID_FMT", message ignored", ucred.uid); |
912541b0 KS |
201 | goto err; |
202 | } | |
203 | ||
204 | /* enable receiving of the sender credentials in the messages */ | |
4bbdff75 TG |
205 | r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); |
206 | if (r < 0) | |
56f64d95 | 207 | log_warning_errno(errno, "could not set SO_PASSCRED: %m"); |
4bbdff75 | 208 | |
912541b0 KS |
209 | udev_ctrl_ref(uctrl); |
210 | return conn; | |
2c64f589 | 211 | err: |
912541b0 KS |
212 | if (conn->sock >= 0) |
213 | close(conn->sock); | |
6b430fdb | 214 | return mfree(conn); |
ff2c503d KS |
215 | } |
216 | ||
9ec6e95b | 217 | struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) { |
912541b0 KS |
218 | if (conn == NULL) |
219 | return NULL; | |
220 | conn->refcount++; | |
221 | return conn; | |
ff2c503d KS |
222 | } |
223 | ||
9ec6e95b | 224 | struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) { |
35927d13 TG |
225 | if (conn && -- conn->refcount == 0) { |
226 | if (conn->sock >= 0) | |
227 | close(conn->sock); | |
228 | ||
229 | udev_ctrl_unref(conn->uctrl); | |
230 | ||
231 | free(conn); | |
232 | } | |
233 | ||
912541b0 | 234 | return NULL; |
ff2c503d KS |
235 | } |
236 | ||
9ec6e95b | 237 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) { |
912541b0 KS |
238 | struct udev_ctrl_msg_wire ctrl_msg_wire; |
239 | int err = 0; | |
240 | ||
29804cc1 | 241 | memzero(&ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire)); |
912541b0 KS |
242 | strcpy(ctrl_msg_wire.version, "udev-" VERSION); |
243 | ctrl_msg_wire.magic = UDEV_CTRL_MAGIC; | |
244 | ctrl_msg_wire.type = type; | |
245 | ||
246 | if (buf != NULL) | |
d5a89d7d | 247 | strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); |
912541b0 KS |
248 | else |
249 | ctrl_msg_wire.intval = intval; | |
250 | ||
251 | if (!uctrl->connected) { | |
6421348d | 252 | if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) { |
912541b0 KS |
253 | err = -errno; |
254 | goto out; | |
255 | } | |
256 | uctrl->connected = true; | |
257 | } | |
258 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) { | |
259 | err = -errno; | |
260 | goto out; | |
261 | } | |
262 | ||
263 | /* wait for peer message handling or disconnect */ | |
264 | for (;;) { | |
265 | struct pollfd pfd[1]; | |
266 | int r; | |
267 | ||
268 | pfd[0].fd = uctrl->sock; | |
269 | pfd[0].events = POLLIN; | |
9ea28c55 | 270 | r = poll(pfd, 1, timeout * MSEC_PER_SEC); |
912541b0 KS |
271 | if (r < 0) { |
272 | if (errno == EINTR) | |
273 | continue; | |
274 | err = -errno; | |
275 | break; | |
276 | } | |
277 | ||
278 | if (r > 0 && pfd[0].revents & POLLERR) { | |
279 | err = -EIO; | |
280 | break; | |
281 | } | |
282 | ||
283 | if (r == 0) | |
284 | err = -ETIMEDOUT; | |
285 | break; | |
286 | } | |
ff2c503d | 287 | out: |
912541b0 | 288 | return err; |
d59f11e1 KS |
289 | } |
290 | ||
9ec6e95b | 291 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) { |
912541b0 | 292 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
293 | } |
294 | ||
9ec6e95b | 295 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 296 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
297 | } |
298 | ||
9ec6e95b | 299 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 300 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
301 | } |
302 | ||
9ec6e95b | 303 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 304 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
305 | } |
306 | ||
9ec6e95b | 307 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) { |
912541b0 | 308 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
309 | } |
310 | ||
9ec6e95b | 311 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) { |
912541b0 | 312 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
313 | } |
314 | ||
9ec6e95b | 315 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 316 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
317 | } |
318 | ||
9ec6e95b | 319 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 320 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
321 | } |
322 | ||
9ec6e95b | 323 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) { |
912541b0 KS |
324 | struct udev_ctrl_msg *uctrl_msg; |
325 | ssize_t size; | |
912541b0 KS |
326 | struct cmsghdr *cmsg; |
327 | struct iovec iov; | |
912541b0 | 328 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
97fec53e ZJS |
329 | struct msghdr smsg = { |
330 | .msg_iov = &iov, | |
331 | .msg_iovlen = 1, | |
332 | .msg_control = cred_msg, | |
333 | .msg_controllen = sizeof(cred_msg), | |
334 | }; | |
335 | struct ucred *cred; | |
912541b0 | 336 | |
97fec53e | 337 | uctrl_msg = new0(struct udev_ctrl_msg, 1); |
912541b0 KS |
338 | if (uctrl_msg == NULL) |
339 | return NULL; | |
340 | uctrl_msg->refcount = 1; | |
341 | uctrl_msg->conn = conn; | |
342 | udev_ctrl_connection_ref(conn); | |
343 | ||
344 | /* wait for the incoming message */ | |
f168c273 | 345 | for (;;) { |
912541b0 KS |
346 | struct pollfd pfd[1]; |
347 | int r; | |
348 | ||
349 | pfd[0].fd = conn->sock; | |
350 | pfd[0].events = POLLIN; | |
351 | ||
352 | r = poll(pfd, 1, 10000); | |
353 | if (r < 0) { | |
354 | if (errno == EINTR) | |
355 | continue; | |
356 | goto err; | |
357 | } else if (r == 0) { | |
9f6445e3 | 358 | log_error("timeout waiting for ctrl message"); |
912541b0 KS |
359 | goto err; |
360 | } else { | |
361 | if (!(pfd[0].revents & POLLIN)) { | |
56f64d95 | 362 | log_error_errno(errno, "ctrl connection error: %m"); |
912541b0 KS |
363 | goto err; |
364 | } | |
365 | } | |
366 | ||
367 | break; | |
368 | } | |
369 | ||
370 | iov.iov_base = &uctrl_msg->ctrl_msg_wire; | |
371 | iov.iov_len = sizeof(struct udev_ctrl_msg_wire); | |
97fec53e | 372 | |
a38d9945 | 373 | size = recvmsg(conn->sock, &smsg, 0); |
912541b0 | 374 | if (size < 0) { |
56f64d95 | 375 | log_error_errno(errno, "unable to receive ctrl message: %m"); |
912541b0 KS |
376 | goto err; |
377 | } | |
1c8da044 LP |
378 | |
379 | cmsg_close_all(&smsg); | |
380 | ||
912541b0 | 381 | cmsg = CMSG_FIRSTHDR(&smsg); |
912541b0 KS |
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 | ||
93b1da85 KZ |
388 | cred = (struct ucred *) CMSG_DATA(cmsg); |
389 | ||
912541b0 | 390 | if (cred->uid != 0) { |
1fa2f38f | 391 | log_error("sender uid="UID_FMT", message ignored", cred->uid); |
912541b0 KS |
392 | goto err; |
393 | } | |
394 | ||
395 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
9f6445e3 | 396 | log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic); |
912541b0 KS |
397 | goto err; |
398 | } | |
399 | ||
912541b0 | 400 | return uctrl_msg; |
d59f11e1 | 401 | err: |
912541b0 KS |
402 | udev_ctrl_msg_unref(uctrl_msg); |
403 | return NULL; | |
d59f11e1 KS |
404 | } |
405 | ||
9ec6e95b | 406 | struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) { |
35927d13 TG |
407 | if (ctrl_msg && -- ctrl_msg->refcount == 0) { |
408 | udev_ctrl_connection_unref(ctrl_msg->conn); | |
409 | free(ctrl_msg); | |
410 | } | |
411 | ||
912541b0 | 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 | } |