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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" |
5cfa2c3d | 23 | #include "io-util.h" |
3ffd4af2 | 24 | #include "socket-util.h" |
7d68eb1b YW |
25 | #include "strxcpyx.h" |
26 | #include "udev-ctrl.h" | |
ef118d00 | 27 | #include "util.h" |
d59f11e1 | 28 | |
540f4669 | 29 | /* wire protocol magic must match */ |
912541b0 | 30 | #define UDEV_CTRL_MAGIC 0xdead1dea |
d59f11e1 KS |
31 | |
32 | enum udev_ctrl_msg_type { | |
912541b0 KS |
33 | UDEV_CTRL_UNKNOWN, |
34 | UDEV_CTRL_SET_LOG_LEVEL, | |
35 | UDEV_CTRL_STOP_EXEC_QUEUE, | |
36 | UDEV_CTRL_START_EXEC_QUEUE, | |
37 | UDEV_CTRL_RELOAD, | |
38 | UDEV_CTRL_SET_ENV, | |
39 | UDEV_CTRL_SET_CHILDREN_MAX, | |
40 | UDEV_CTRL_PING, | |
41 | UDEV_CTRL_EXIT, | |
d59f11e1 KS |
42 | }; |
43 | ||
b692a750 | 44 | struct udev_ctrl_msg_wire { |
912541b0 | 45 | char version[16]; |
14cb109d | 46 | unsigned magic; |
912541b0 KS |
47 | enum udev_ctrl_msg_type type; |
48 | union { | |
49 | int intval; | |
50 | char buf[256]; | |
51 | }; | |
d59f11e1 KS |
52 | }; |
53 | ||
54 | struct udev_ctrl_msg { | |
8f71a0d1 | 55 | unsigned n_ref; |
912541b0 KS |
56 | struct udev_ctrl_connection *conn; |
57 | struct udev_ctrl_msg_wire ctrl_msg_wire; | |
d59f11e1 KS |
58 | }; |
59 | ||
60 | struct udev_ctrl { | |
8f71a0d1 | 61 | unsigned n_ref; |
912541b0 | 62 | int sock; |
6421348d | 63 | union sockaddr_union saddr; |
912541b0 KS |
64 | socklen_t addrlen; |
65 | bool bound; | |
66 | bool cleanup_socket; | |
67 | bool connected; | |
ff2c503d KS |
68 | }; |
69 | ||
70 | struct udev_ctrl_connection { | |
8f71a0d1 | 71 | unsigned n_ref; |
912541b0 KS |
72 | struct udev_ctrl *uctrl; |
73 | int sock; | |
d59f11e1 KS |
74 | }; |
75 | ||
2024ed61 | 76 | struct udev_ctrl *udev_ctrl_new_from_fd(int fd) { |
912541b0 | 77 | struct udev_ctrl *uctrl; |
4bbdff75 | 78 | int r; |
912541b0 | 79 | |
955d98c9 | 80 | uctrl = new0(struct udev_ctrl, 1); |
9315f853 | 81 | if (!uctrl) |
912541b0 | 82 | return NULL; |
8f71a0d1 | 83 | uctrl->n_ref = 1; |
912541b0 KS |
84 | |
85 | if (fd < 0) { | |
86 | uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0); | |
87 | if (uctrl->sock < 0) { | |
572909a3 | 88 | log_error_errno(errno, "Failed to create 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 | */ | |
2ff48e98 | 101 | r = setsockopt_int(uctrl->sock, SOL_SOCKET, SO_PASSCRED, true); |
4bbdff75 | 102 | if (r < 0) |
572909a3 | 103 | log_warning_errno(r, "Failed to set SO_PASSCRED: %m"); |
912541b0 | 104 | |
44ed5214 LP |
105 | uctrl->saddr.un = (struct sockaddr_un) { |
106 | .sun_family = AF_UNIX, | |
107 | .sun_path = "/run/udev/control", | |
108 | }; | |
109 | ||
fc2fffe7 | 110 | uctrl->addrlen = SOCKADDR_UN_LEN(uctrl->saddr.un); |
912541b0 | 111 | return uctrl; |
fc1de713 KS |
112 | } |
113 | ||
2024ed61 YW |
114 | struct udev_ctrl *udev_ctrl_new(void) { |
115 | return udev_ctrl_new_from_fd(-1); | |
d59f11e1 KS |
116 | } |
117 | ||
9ec6e95b | 118 | int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) { |
912541b0 KS |
119 | int err; |
120 | ||
121 | if (!uctrl->bound) { | |
6421348d | 122 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); |
912541b0 | 123 | if (err < 0 && errno == EADDRINUSE) { |
155b6876 | 124 | (void) sockaddr_un_unlink(&uctrl->saddr.un); |
6421348d | 125 | err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen); |
912541b0 KS |
126 | } |
127 | ||
ece174c5 | 128 | if (err < 0) |
572909a3 | 129 | return log_error_errno(errno, "Failed to bind socket: %m"); |
912541b0 KS |
130 | |
131 | err = listen(uctrl->sock, 0); | |
ece174c5 | 132 | if (err < 0) |
572909a3 | 133 | return log_error_errno(errno, "Failed to listen: %m"); |
912541b0 KS |
134 | |
135 | uctrl->bound = true; | |
136 | uctrl->cleanup_socket = true; | |
137 | } | |
138 | return 0; | |
d59f11e1 KS |
139 | } |
140 | ||
8f71a0d1 YW |
141 | static struct udev_ctrl *udev_ctrl_free(struct udev_ctrl *uctrl) { |
142 | assert(uctrl); | |
35927d13 | 143 | |
8f71a0d1 YW |
144 | safe_close(uctrl->sock); |
145 | return mfree(uctrl); | |
d59f11e1 KS |
146 | } |
147 | ||
8f71a0d1 YW |
148 | DEFINE_PRIVATE_TRIVIAL_REF_FUNC(struct udev_ctrl, udev_ctrl); |
149 | DEFINE_TRIVIAL_UNREF_FUNC(struct udev_ctrl, udev_ctrl, udev_ctrl_free); | |
d59f11e1 | 150 | |
9ec6e95b | 151 | int udev_ctrl_cleanup(struct udev_ctrl *uctrl) { |
9315f853 | 152 | if (!uctrl) |
912541b0 KS |
153 | return 0; |
154 | if (uctrl->cleanup_socket) | |
155b6876 | 155 | sockaddr_un_unlink(&uctrl->saddr.un); |
912541b0 | 156 | return 0; |
1f5a5100 KS |
157 | } |
158 | ||
9ec6e95b | 159 | int udev_ctrl_get_fd(struct udev_ctrl *uctrl) { |
9315f853 | 160 | if (!uctrl) |
912541b0 KS |
161 | return -EINVAL; |
162 | return uctrl->sock; | |
d59f11e1 KS |
163 | } |
164 | ||
9ec6e95b | 165 | struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) { |
912541b0 | 166 | struct udev_ctrl_connection *conn; |
39883f62 | 167 | struct ucred ucred = {}; |
eff05270 | 168 | int r; |
912541b0 | 169 | |
eff05270 | 170 | conn = new(struct udev_ctrl_connection, 1); |
9315f853 | 171 | if (!conn) |
912541b0 | 172 | return NULL; |
8f71a0d1 | 173 | conn->n_ref = 1; |
912541b0 KS |
174 | conn->uctrl = uctrl; |
175 | ||
176 | conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK); | |
177 | if (conn->sock < 0) { | |
178 | if (errno != EINTR) | |
572909a3 | 179 | log_error_errno(errno, "Failed to receive ctrl connection: %m"); |
912541b0 KS |
180 | goto err; |
181 | } | |
182 | ||
183 | /* check peer credential of connection */ | |
eff05270 LP |
184 | r = getpeercred(conn->sock, &ucred); |
185 | if (r < 0) { | |
572909a3 | 186 | log_error_errno(r, "Failed to receive credentials of ctrl connection: %m"); |
912541b0 KS |
187 | goto err; |
188 | } | |
189 | if (ucred.uid > 0) { | |
572909a3 | 190 | log_error("Sender uid="UID_FMT", message ignored", ucred.uid); |
912541b0 KS |
191 | goto err; |
192 | } | |
193 | ||
194 | /* enable receiving of the sender credentials in the messages */ | |
2ff48e98 | 195 | r = setsockopt_int(conn->sock, SOL_SOCKET, SO_PASSCRED, true); |
4bbdff75 | 196 | if (r < 0) |
572909a3 | 197 | log_warning_errno(r, "Failed to set SO_PASSCRED: %m"); |
4bbdff75 | 198 | |
912541b0 KS |
199 | udev_ctrl_ref(uctrl); |
200 | return conn; | |
2c64f589 | 201 | err: |
a4209121 | 202 | safe_close(conn->sock); |
6b430fdb | 203 | return mfree(conn); |
ff2c503d KS |
204 | } |
205 | ||
8f71a0d1 YW |
206 | static struct udev_ctrl_connection *udev_ctrl_connection_free(struct udev_ctrl_connection *conn) { |
207 | assert(conn); | |
35927d13 | 208 | |
8f71a0d1 YW |
209 | safe_close(conn->sock); |
210 | udev_ctrl_unref(conn->uctrl); | |
211 | return mfree(conn); | |
ff2c503d KS |
212 | } |
213 | ||
8f71a0d1 YW |
214 | DEFINE_TRIVIAL_REF_UNREF_FUNC(struct udev_ctrl_connection, udev_ctrl_connection, udev_ctrl_connection_free); |
215 | ||
9ec6e95b | 216 | static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) { |
b9da6a09 ZJS |
217 | struct udev_ctrl_msg_wire ctrl_msg_wire = { |
218 | .version = "udev-" STRINGIFY(PROJECT_VERSION), | |
219 | .magic = UDEV_CTRL_MAGIC, | |
220 | .type = type, | |
221 | }; | |
912541b0 | 222 | |
9315f853 | 223 | if (buf) |
d5a89d7d | 224 | strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf); |
912541b0 KS |
225 | else |
226 | ctrl_msg_wire.intval = intval; | |
227 | ||
228 | if (!uctrl->connected) { | |
b9da6a09 ZJS |
229 | if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) |
230 | return -errno; | |
912541b0 KS |
231 | uctrl->connected = true; |
232 | } | |
b9da6a09 ZJS |
233 | if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) |
234 | return -errno; | |
912541b0 KS |
235 | |
236 | /* wait for peer message handling or disconnect */ | |
237 | for (;;) { | |
b9da6a09 ZJS |
238 | struct pollfd pfd = { |
239 | .fd = uctrl->sock, | |
240 | .events = POLLIN, | |
241 | }; | |
912541b0 KS |
242 | int r; |
243 | ||
b9da6a09 | 244 | r = poll(&pfd, 1, timeout * MSEC_PER_SEC); |
49c603bd | 245 | if (r < 0) { |
912541b0 KS |
246 | if (errno == EINTR) |
247 | continue; | |
b9da6a09 | 248 | return -errno; |
912541b0 | 249 | } |
912541b0 | 250 | if (r == 0) |
b9da6a09 ZJS |
251 | return -ETIMEDOUT; |
252 | if (pfd.revents & POLLERR) | |
253 | return -EIO; | |
254 | return 0; | |
912541b0 | 255 | } |
d59f11e1 KS |
256 | } |
257 | ||
9ec6e95b | 258 | int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) { |
912541b0 | 259 | return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout); |
ff2c503d KS |
260 | } |
261 | ||
9ec6e95b | 262 | int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 263 | return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
264 | } |
265 | ||
9ec6e95b | 266 | int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 267 | return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout); |
d59f11e1 KS |
268 | } |
269 | ||
9ec6e95b | 270 | int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 271 | return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout); |
d59f11e1 KS |
272 | } |
273 | ||
9ec6e95b | 274 | int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) { |
912541b0 | 275 | return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout); |
d59f11e1 KS |
276 | } |
277 | ||
9ec6e95b | 278 | int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) { |
912541b0 | 279 | return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout); |
d59f11e1 KS |
280 | } |
281 | ||
9ec6e95b | 282 | int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 283 | return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout); |
d59f11e1 KS |
284 | } |
285 | ||
9ec6e95b | 286 | int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) { |
912541b0 | 287 | return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout); |
bb38678e SJR |
288 | } |
289 | ||
9ec6e95b | 290 | struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) { |
912541b0 KS |
291 | struct udev_ctrl_msg *uctrl_msg; |
292 | ssize_t size; | |
912541b0 KS |
293 | struct cmsghdr *cmsg; |
294 | struct iovec iov; | |
912541b0 | 295 | char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
97fec53e ZJS |
296 | struct msghdr smsg = { |
297 | .msg_iov = &iov, | |
298 | .msg_iovlen = 1, | |
299 | .msg_control = cred_msg, | |
300 | .msg_controllen = sizeof(cred_msg), | |
301 | }; | |
302 | struct ucred *cred; | |
912541b0 | 303 | |
97fec53e | 304 | uctrl_msg = new0(struct udev_ctrl_msg, 1); |
9315f853 | 305 | if (!uctrl_msg) |
912541b0 | 306 | return NULL; |
8f71a0d1 | 307 | uctrl_msg->n_ref = 1; |
912541b0 KS |
308 | uctrl_msg->conn = conn; |
309 | udev_ctrl_connection_ref(conn); | |
310 | ||
311 | /* wait for the incoming message */ | |
f168c273 | 312 | for (;;) { |
912541b0 KS |
313 | struct pollfd pfd[1]; |
314 | int r; | |
315 | ||
316 | pfd[0].fd = conn->sock; | |
317 | pfd[0].events = POLLIN; | |
318 | ||
319 | r = poll(pfd, 1, 10000); | |
49c603bd | 320 | if (r < 0) { |
912541b0 KS |
321 | if (errno == EINTR) |
322 | continue; | |
323 | goto err; | |
324 | } else if (r == 0) { | |
572909a3 | 325 | log_error("Timeout waiting for ctrl message"); |
912541b0 KS |
326 | goto err; |
327 | } else { | |
328 | if (!(pfd[0].revents & POLLIN)) { | |
572909a3 | 329 | log_error("Invalid ctrl connection: %m"); |
912541b0 KS |
330 | goto err; |
331 | } | |
332 | } | |
333 | ||
334 | break; | |
335 | } | |
336 | ||
5cfa2c3d | 337 | iov = IOVEC_MAKE(&uctrl_msg->ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire)); |
97fec53e | 338 | |
a38d9945 | 339 | size = recvmsg(conn->sock, &smsg, 0); |
572909a3 YW |
340 | if (size < 0) { |
341 | log_error_errno(errno, "Failed to receive ctrl message: %m"); | |
912541b0 KS |
342 | goto err; |
343 | } | |
1c8da044 LP |
344 | |
345 | cmsg_close_all(&smsg); | |
346 | ||
912541b0 | 347 | cmsg = CMSG_FIRSTHDR(&smsg); |
912541b0 | 348 | |
9315f853 | 349 | if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) { |
572909a3 | 350 | log_error("No sender credentials received, ignoring message"); |
912541b0 KS |
351 | goto err; |
352 | } | |
353 | ||
93b1da85 KZ |
354 | cred = (struct ucred *) CMSG_DATA(cmsg); |
355 | ||
912541b0 | 356 | if (cred->uid != 0) { |
572909a3 | 357 | log_error("Sender uid="UID_FMT", ignoring message", cred->uid); |
912541b0 KS |
358 | goto err; |
359 | } | |
360 | ||
361 | if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) { | |
572909a3 | 362 | log_error("Message magic 0x%08x doesn't match, ignoring", uctrl_msg->ctrl_msg_wire.magic); |
912541b0 KS |
363 | goto err; |
364 | } | |
365 | ||
912541b0 | 366 | return uctrl_msg; |
d59f11e1 | 367 | err: |
912541b0 KS |
368 | udev_ctrl_msg_unref(uctrl_msg); |
369 | return NULL; | |
d59f11e1 KS |
370 | } |
371 | ||
8f71a0d1 YW |
372 | static struct udev_ctrl_msg *udev_ctrl_msg_free(struct udev_ctrl_msg *ctrl_msg) { |
373 | assert(ctrl_msg); | |
35927d13 | 374 | |
8f71a0d1 YW |
375 | udev_ctrl_connection_unref(ctrl_msg->conn); |
376 | return mfree(ctrl_msg); | |
d59f11e1 KS |
377 | } |
378 | ||
8f71a0d1 YW |
379 | DEFINE_TRIVIAL_UNREF_FUNC(struct udev_ctrl_msg, udev_ctrl_msg, udev_ctrl_msg_free); |
380 | ||
9ec6e95b | 381 | int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
382 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL) |
383 | return ctrl_msg->ctrl_msg_wire.intval; | |
384 | return -1; | |
d59f11e1 KS |
385 | } |
386 | ||
9ec6e95b | 387 | int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
388 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE) |
389 | return 1; | |
390 | return -1; | |
d59f11e1 KS |
391 | } |
392 | ||
9ec6e95b | 393 | int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
394 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE) |
395 | return 1; | |
396 | return -1; | |
d59f11e1 KS |
397 | } |
398 | ||
9ec6e95b | 399 | int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
400 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD) |
401 | return 1; | |
402 | return -1; | |
d59f11e1 KS |
403 | } |
404 | ||
9ec6e95b | 405 | const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
406 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV) |
407 | return ctrl_msg->ctrl_msg_wire.buf; | |
408 | return NULL; | |
d59f11e1 KS |
409 | } |
410 | ||
9ec6e95b | 411 | int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
412 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX) |
413 | return ctrl_msg->ctrl_msg_wire.intval; | |
414 | return -1; | |
d59f11e1 | 415 | } |
bb38678e | 416 | |
9ec6e95b | 417 | int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
418 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING) |
419 | return 1; | |
420 | return -1; | |
ff2c503d KS |
421 | } |
422 | ||
9ec6e95b | 423 | int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) { |
912541b0 KS |
424 | if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT) |
425 | return 1; | |
426 | return -1; | |
bb38678e | 427 | } |