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;