2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #include <sys/types.h>
29 #include <sys/socket.h>
34 #include "libudev-private.h"
36 #define UDEV_CTRL_MAGIC "udevd-128"
38 enum udev_ctrl_msg_type
{
40 UDEV_CTRL_SET_LOG_LEVEL
,
41 UDEV_CTRL_STOP_EXEC_QUEUE
,
42 UDEV_CTRL_START_EXEC_QUEUE
,
43 UDEV_CTRL_RELOAD_RULES
,
45 UDEV_CTRL_SET_MAX_CHILDS
,
46 UDEV_CTRL_SET_MAX_CHILDS_RUNNING
,
51 enum udev_ctrl_msg_type type
;
58 struct udev_ctrl_msg
{
60 struct udev_ctrl
*uctrl
;
61 struct ctrl_msg ctrl_msg
;
68 struct sockaddr_un saddr
;
72 struct udev_ctrl
*udev_ctrl_new_from_socket(struct udev
*udev
, const char *socket_path
)
74 struct udev_ctrl
*uctrl
;
76 uctrl
= malloc(sizeof(struct udev_ctrl
));
79 memset(uctrl
, 0x00, sizeof(struct udev_ctrl
));
83 uctrl
->sock
= socket(AF_LOCAL
, SOCK_DGRAM
, 0);
84 if (uctrl
->sock
< 0) {
85 err(udev
, "error getting socket: %s\n", strerror(errno
));
86 udev_ctrl_unref(uctrl
);
90 uctrl
->saddr
.sun_family
= AF_LOCAL
;
91 strcpy(uctrl
->saddr
.sun_path
, socket_path
);
92 uctrl
->addrlen
= offsetof(struct sockaddr_un
, sun_path
) + strlen(uctrl
->saddr
.sun_path
);
93 /* translate leading '@' to abstract namespace */
94 if (uctrl
->saddr
.sun_path
[0] == '@')
95 uctrl
->saddr
.sun_path
[0] = '\0';
100 int udev_ctrl_enable_receiving(struct udev_ctrl
*uctrl
)
103 const int feature_on
= 1;
105 err
= bind(uctrl
->sock
, (struct sockaddr
*)&uctrl
->saddr
, uctrl
->addrlen
);
107 err(uctrl
->udev
, "bind failed: %s\n", strerror(errno
));
111 /* enable receiving of the sender credentials */
112 setsockopt(uctrl
->sock
, SOL_SOCKET
, SO_PASSCRED
, &feature_on
, sizeof(feature_on
));
116 struct udev
*udev_ctrl_get_udev(struct udev_ctrl
*uctrl
)
121 struct udev_ctrl
*udev_ctrl_ref(struct udev_ctrl
*uctrl
)
129 void udev_ctrl_unref(struct udev_ctrl
*uctrl
)
134 if (uctrl
->refcount
> 0)
136 if (uctrl
->sock
>= 0)
141 int udev_ctrl_get_fd(struct udev_ctrl
*uctrl
)
148 static int ctrl_send(struct udev_ctrl
*uctrl
, enum udev_ctrl_msg_type type
, int intval
, const char *buf
)
150 struct ctrl_msg ctrl_msg
;
153 memset(&ctrl_msg
, 0x00, sizeof(struct ctrl_msg
));
154 strcpy(ctrl_msg
.magic
, UDEV_CTRL_MAGIC
);
155 ctrl_msg
.type
= type
;
158 strlcpy(ctrl_msg
.buf
, buf
, sizeof(ctrl_msg
.buf
));
160 ctrl_msg
.intval
= intval
;
162 err
= sendto(uctrl
->sock
, &ctrl_msg
, sizeof(ctrl_msg
), 0, (struct sockaddr
*)&uctrl
->saddr
, uctrl
->addrlen
);
164 err(uctrl
->udev
, "error sending message: %s\n", strerror(errno
));
169 int udev_ctrl_send_set_log_level(struct udev_ctrl
*uctrl
, int priority
)
171 ctrl_send(uctrl
, UDEV_CTRL_SET_LOG_LEVEL
, priority
, NULL
);
175 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl
*uctrl
)
177 ctrl_send(uctrl
, UDEV_CTRL_STOP_EXEC_QUEUE
, 0, NULL
);
181 int udev_ctrl_send_start_exec_queue(struct udev_ctrl
*uctrl
)
183 ctrl_send(uctrl
, UDEV_CTRL_START_EXEC_QUEUE
, 0, NULL
);
187 int udev_ctrl_send_reload_rules(struct udev_ctrl
*uctrl
)
189 ctrl_send(uctrl
, UDEV_CTRL_RELOAD_RULES
, 0, NULL
);
193 int udev_ctrl_send_set_env(struct udev_ctrl
*uctrl
, const char *key
)
195 ctrl_send(uctrl
, UDEV_CTRL_SET_ENV
, 0, optarg
);
199 int udev_ctrl_send_set_max_childs(struct udev_ctrl
*uctrl
, int count
)
201 ctrl_send(uctrl
, UDEV_CTRL_SET_MAX_CHILDS
, count
, NULL
);
205 struct udev_ctrl_msg
*udev_ctrl_receive_msg(struct udev_ctrl
*uctrl
)
207 struct udev_ctrl_msg
*uctrl_msg
;
210 struct cmsghdr
*cmsg
;
213 char cred_msg
[CMSG_SPACE(sizeof(struct ucred
))];
215 uctrl_msg
= malloc(sizeof(struct udev_ctrl_msg
));
216 if (uctrl_msg
== NULL
)
218 memset(uctrl_msg
, 0x00, sizeof(struct udev_ctrl_msg
));
219 uctrl_msg
->refcount
= 1;
220 uctrl_msg
->uctrl
= uctrl
;
222 iov
.iov_base
= &uctrl_msg
->ctrl_msg
;
223 iov
.iov_len
= sizeof(struct udev_ctrl_msg
);
225 memset(&smsg
, 0x00, sizeof(struct msghdr
));
228 smsg
.msg_control
= cred_msg
;
229 smsg
.msg_controllen
= sizeof(cred_msg
);
231 size
= recvmsg(uctrl
->sock
, &smsg
, 0);
233 err(uctrl
->udev
, "unable to receive user udevd message: %s\n", strerror(errno
));
236 cmsg
= CMSG_FIRSTHDR(&smsg
);
237 cred
= (struct ucred
*) CMSG_DATA(cmsg
);
239 if (cmsg
== NULL
|| cmsg
->cmsg_type
!= SCM_CREDENTIALS
) {
240 err(uctrl
->udev
, "no sender credentials received, message ignored\n");
244 if (cred
->uid
!= 0) {
245 err(uctrl
->udev
, "sender uid=%i, message ignored\n", cred
->uid
);
249 if (strncmp(uctrl_msg
->ctrl_msg
.magic
, UDEV_CTRL_MAGIC
, sizeof(UDEV_CTRL_MAGIC
)) != 0 ) {
250 err(uctrl
->udev
, "message magic '%s' doesn't match, ignore it\n", uctrl_msg
->ctrl_msg
.magic
);
254 info(uctrl
->udev
, "created ctrl_msg %p (%i)\n", uctrl_msg
, uctrl_msg
->ctrl_msg
.type
);
257 udev_ctrl_msg_unref(uctrl_msg
);
261 struct udev_ctrl_msg
*udev_ctrl_msg_ref(struct udev_ctrl_msg
*ctrl_msg
)
263 if (ctrl_msg
== NULL
)
265 ctrl_msg
->refcount
++;
269 void udev_ctrl_msg_unref(struct udev_ctrl_msg
*ctrl_msg
)
271 if (ctrl_msg
== NULL
)
273 ctrl_msg
->refcount
--;
274 if (ctrl_msg
->refcount
> 0)
276 info(ctrl_msg
->uctrl
->udev
, "release ctrl_msg %p\n", ctrl_msg
);
280 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg
*ctrl_msg
)
282 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_SET_LOG_LEVEL
)
283 return ctrl_msg
->ctrl_msg
.intval
;
287 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg
*ctrl_msg
)
289 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_STOP_EXEC_QUEUE
)
294 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg
*ctrl_msg
)
296 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_START_EXEC_QUEUE
)
301 int udev_ctrl_get_reload_rules(struct udev_ctrl_msg
*ctrl_msg
)
303 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_RELOAD_RULES
)
308 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg
*ctrl_msg
)
310 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_SET_ENV
)
311 return ctrl_msg
->ctrl_msg
.buf
;
315 int udev_ctrl_get_set_max_childs(struct udev_ctrl_msg
*ctrl_msg
)
317 if (ctrl_msg
->ctrl_msg
.type
== UDEV_CTRL_SET_MAX_CHILDS
)
318 return ctrl_msg
->ctrl_msg
.intval
;