2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay@vrfy.org>
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.
18 #include <sys/types.h>
20 #include <sys/socket.h>
25 /* wire protocol magic must match */
26 #define UDEV_CTRL_MAGIC 0xdead1dea
28 enum udev_ctrl_msg_type
{
30 UDEV_CTRL_SET_LOG_LEVEL
,
31 UDEV_CTRL_STOP_EXEC_QUEUE
,
32 UDEV_CTRL_START_EXEC_QUEUE
,
35 UDEV_CTRL_SET_CHILDREN_MAX
,
40 struct udev_ctrl_msg_wire
{
43 enum udev_ctrl_msg_type type
;
50 struct udev_ctrl_msg
{
52 struct udev_ctrl_connection
*conn
;
53 struct udev_ctrl_msg_wire ctrl_msg_wire
;
60 struct sockaddr_un saddr
;
67 struct udev_ctrl_connection
{
69 struct udev_ctrl
*uctrl
;
73 struct udev_ctrl
*udev_ctrl_new_from_fd(struct udev
*udev
, int fd
)
75 struct udev_ctrl
*uctrl
;
77 uctrl
= calloc(1, sizeof(struct udev_ctrl
));
84 uctrl
->sock
= socket(AF_LOCAL
, SOCK_SEQPACKET
|SOCK_NONBLOCK
|SOCK_CLOEXEC
, 0);
85 if (uctrl
->sock
< 0) {
86 log_error("error getting socket: %m\n");
87 udev_ctrl_unref(uctrl
);
95 uctrl
->saddr
.sun_family
= AF_LOCAL
;
96 util_strscpy(uctrl
->saddr
.sun_path
, sizeof(uctrl
->saddr
.sun_path
), "/run/udev/control");
97 uctrl
->addrlen
= offsetof(struct sockaddr_un
, sun_path
) + strlen(uctrl
->saddr
.sun_path
);
101 struct udev_ctrl
*udev_ctrl_new(struct udev
*udev
)
103 return udev_ctrl_new_from_fd(udev
, -1);
106 int udev_ctrl_enable_receiving(struct udev_ctrl
*uctrl
)
111 err
= bind(uctrl
->sock
, (struct sockaddr
*)&uctrl
->saddr
, uctrl
->addrlen
);
112 if (err
< 0 && errno
== EADDRINUSE
) {
113 unlink(uctrl
->saddr
.sun_path
);
114 err
= bind(uctrl
->sock
, (struct sockaddr
*)&uctrl
->saddr
, uctrl
->addrlen
);
119 log_error("bind failed: %m\n");
123 err
= listen(uctrl
->sock
, 0);
126 log_error("listen failed: %m\n");
131 uctrl
->cleanup_socket
= true;
136 struct udev
*udev_ctrl_get_udev(struct udev_ctrl
*uctrl
)
141 struct udev_ctrl
*udev_ctrl_ref(struct udev_ctrl
*uctrl
)
149 struct udev_ctrl
*udev_ctrl_unref(struct udev_ctrl
*uctrl
)
154 if (uctrl
->refcount
> 0)
156 if (uctrl
->sock
>= 0)
162 int udev_ctrl_cleanup(struct udev_ctrl
*uctrl
)
166 if (uctrl
->cleanup_socket
)
167 unlink(uctrl
->saddr
.sun_path
);
171 int udev_ctrl_get_fd(struct udev_ctrl
*uctrl
)
178 struct udev_ctrl_connection
*udev_ctrl_get_connection(struct udev_ctrl
*uctrl
)
180 struct udev_ctrl_connection
*conn
;
185 conn
= calloc(1, sizeof(struct udev_ctrl_connection
));
191 conn
->sock
= accept4(uctrl
->sock
, NULL
, NULL
, SOCK_CLOEXEC
|SOCK_NONBLOCK
);
192 if (conn
->sock
< 0) {
194 log_error("unable to receive ctrl connection: %m\n");
198 /* check peer credential of connection */
199 slen
= sizeof(ucred
);
200 if (getsockopt(conn
->sock
, SOL_SOCKET
, SO_PEERCRED
, &ucred
, &slen
) < 0) {
201 log_error("unable to receive credentials of ctrl connection: %m\n");
205 log_error("sender uid=%i, message ignored\n", ucred
.uid
);
209 /* enable receiving of the sender credentials in the messages */
210 setsockopt(conn
->sock
, SOL_SOCKET
, SO_PASSCRED
, &on
, sizeof(on
));
211 udev_ctrl_ref(uctrl
);
220 struct udev_ctrl_connection
*udev_ctrl_connection_ref(struct udev_ctrl_connection
*conn
)
228 struct udev_ctrl_connection
*udev_ctrl_connection_unref(struct udev_ctrl_connection
*conn
)
233 if (conn
->refcount
> 0)
237 udev_ctrl_unref(conn
->uctrl
);
242 static int ctrl_send(struct udev_ctrl
*uctrl
, enum udev_ctrl_msg_type type
, int intval
, const char *buf
, int timeout
)
244 struct udev_ctrl_msg_wire ctrl_msg_wire
;
247 memset(&ctrl_msg_wire
, 0x00, sizeof(struct udev_ctrl_msg_wire
));
248 strcpy(ctrl_msg_wire
.version
, "udev-" VERSION
);
249 ctrl_msg_wire
.magic
= UDEV_CTRL_MAGIC
;
250 ctrl_msg_wire
.type
= type
;
253 util_strscpy(ctrl_msg_wire
.buf
, sizeof(ctrl_msg_wire
.buf
), buf
);
255 ctrl_msg_wire
.intval
= intval
;
257 if (!uctrl
->connected
) {
258 if (connect(uctrl
->sock
, (struct sockaddr
*)&uctrl
->saddr
, uctrl
->addrlen
) < 0) {
262 uctrl
->connected
= true;
264 if (send(uctrl
->sock
, &ctrl_msg_wire
, sizeof(ctrl_msg_wire
), 0) < 0) {
269 /* wait for peer message handling or disconnect */
271 struct pollfd pfd
[1];
274 pfd
[0].fd
= uctrl
->sock
;
275 pfd
[0].events
= POLLIN
;
276 r
= poll(pfd
, 1, timeout
* 1000);
284 if (r
> 0 && pfd
[0].revents
& POLLERR
) {
297 int udev_ctrl_send_set_log_level(struct udev_ctrl
*uctrl
, int priority
, int timeout
)
299 return ctrl_send(uctrl
, UDEV_CTRL_SET_LOG_LEVEL
, priority
, NULL
, timeout
);
302 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl
*uctrl
, int timeout
)
304 return ctrl_send(uctrl
, UDEV_CTRL_STOP_EXEC_QUEUE
, 0, NULL
, timeout
);
307 int udev_ctrl_send_start_exec_queue(struct udev_ctrl
*uctrl
, int timeout
)
309 return ctrl_send(uctrl
, UDEV_CTRL_START_EXEC_QUEUE
, 0, NULL
, timeout
);
312 int udev_ctrl_send_reload(struct udev_ctrl
*uctrl
, int timeout
)
314 return ctrl_send(uctrl
, UDEV_CTRL_RELOAD
, 0, NULL
, timeout
);
317 int udev_ctrl_send_set_env(struct udev_ctrl
*uctrl
, const char *key
, int timeout
)
319 return ctrl_send(uctrl
, UDEV_CTRL_SET_ENV
, 0, key
, timeout
);
322 int udev_ctrl_send_set_children_max(struct udev_ctrl
*uctrl
, int count
, int timeout
)
324 return ctrl_send(uctrl
, UDEV_CTRL_SET_CHILDREN_MAX
, count
, NULL
, timeout
);
327 int udev_ctrl_send_ping(struct udev_ctrl
*uctrl
, int timeout
)
329 return ctrl_send(uctrl
, UDEV_CTRL_PING
, 0, NULL
, timeout
);
332 int udev_ctrl_send_exit(struct udev_ctrl
*uctrl
, int timeout
)
334 return ctrl_send(uctrl
, UDEV_CTRL_EXIT
, 0, NULL
, timeout
);
337 struct udev_ctrl_msg
*udev_ctrl_receive_msg(struct udev_ctrl_connection
*conn
)
339 struct udev_ctrl_msg
*uctrl_msg
;
342 struct cmsghdr
*cmsg
;
345 char cred_msg
[CMSG_SPACE(sizeof(struct ucred
))];
347 uctrl_msg
= calloc(1, sizeof(struct udev_ctrl_msg
));
348 if (uctrl_msg
== NULL
)
350 uctrl_msg
->refcount
= 1;
351 uctrl_msg
->conn
= conn
;
352 udev_ctrl_connection_ref(conn
);
354 /* wait for the incoming message */
356 struct pollfd pfd
[1];
359 pfd
[0].fd
= conn
->sock
;
360 pfd
[0].events
= POLLIN
;
362 r
= poll(pfd
, 1, 10000);
368 log_error("timeout waiting for ctrl message\n");
371 if (!(pfd
[0].revents
& POLLIN
)) {
372 log_error("ctrl connection error: %m\n");
380 iov
.iov_base
= &uctrl_msg
->ctrl_msg_wire
;
381 iov
.iov_len
= sizeof(struct udev_ctrl_msg_wire
);
382 memset(&smsg
, 0x00, sizeof(struct msghdr
));
385 smsg
.msg_control
= cred_msg
;
386 smsg
.msg_controllen
= sizeof(cred_msg
);
387 size
= recvmsg(conn
->sock
, &smsg
, 0);
389 log_error("unable to receive ctrl message: %m\n");
392 cmsg
= CMSG_FIRSTHDR(&smsg
);
393 cred
= (struct ucred
*) CMSG_DATA(cmsg
);
395 if (cmsg
== NULL
|| cmsg
->cmsg_type
!= SCM_CREDENTIALS
) {
396 log_error("no sender credentials received, message ignored\n");
400 if (cred
->uid
!= 0) {
401 log_error("sender uid=%i, message ignored\n", cred
->uid
);
405 if (uctrl_msg
->ctrl_msg_wire
.magic
!= UDEV_CTRL_MAGIC
) {
406 log_error("message magic 0x%08x doesn't match, ignore it\n", uctrl_msg
->ctrl_msg_wire
.magic
);
412 udev_ctrl_msg_unref(uctrl_msg
);
416 struct udev_ctrl_msg
*udev_ctrl_msg_ref(struct udev_ctrl_msg
*ctrl_msg
)
418 if (ctrl_msg
== NULL
)
420 ctrl_msg
->refcount
++;
424 struct udev_ctrl_msg
*udev_ctrl_msg_unref(struct udev_ctrl_msg
*ctrl_msg
)
426 if (ctrl_msg
== NULL
)
428 ctrl_msg
->refcount
--;
429 if (ctrl_msg
->refcount
> 0)
431 udev_ctrl_connection_unref(ctrl_msg
->conn
);
436 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg
*ctrl_msg
)
438 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_SET_LOG_LEVEL
)
439 return ctrl_msg
->ctrl_msg_wire
.intval
;
443 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg
*ctrl_msg
)
445 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_STOP_EXEC_QUEUE
)
450 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg
*ctrl_msg
)
452 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_START_EXEC_QUEUE
)
457 int udev_ctrl_get_reload(struct udev_ctrl_msg
*ctrl_msg
)
459 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_RELOAD
)
464 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg
*ctrl_msg
)
466 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_SET_ENV
)
467 return ctrl_msg
->ctrl_msg_wire
.buf
;
471 int udev_ctrl_get_set_children_max(struct udev_ctrl_msg
*ctrl_msg
)
473 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_SET_CHILDREN_MAX
)
474 return ctrl_msg
->ctrl_msg_wire
.intval
;
478 int udev_ctrl_get_ping(struct udev_ctrl_msg
*ctrl_msg
)
480 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_PING
)
485 int udev_ctrl_get_exit(struct udev_ctrl_msg
*ctrl_msg
)
487 if (ctrl_msg
->ctrl_msg_wire
.type
== UDEV_CTRL_EXIT
)