2 * libudev - interface to udev device information
4 * Copyright (C) 2008 Kay Sievers <kay.sievers@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>
24 #include "libudev-private.h"
26 /* wire protocol magic must match */
27 #define UDEV_CTRL_MAGIC 0xdead1dea
29 enum udev_ctrl_msg_type {
31 UDEV_CTRL_SET_LOG_LEVEL,
32 UDEV_CTRL_STOP_EXEC_QUEUE,
33 UDEV_CTRL_START_EXEC_QUEUE,
34 UDEV_CTRL_RELOAD_RULES,
36 UDEV_CTRL_SET_CHILDREN_MAX,
41 struct udev_ctrl_msg_wire {
44 enum udev_ctrl_msg_type type;
51 struct udev_ctrl_msg {
53 struct udev_ctrl_connection *conn;
54 struct udev_ctrl_msg_wire ctrl_msg_wire;
61 struct sockaddr_un saddr;
66 struct udev_ctrl_connection {
68 struct udev_ctrl *uctrl;
72 static struct udev_ctrl *udev_ctrl_new(struct udev *udev)
74 struct udev_ctrl *uctrl;
76 uctrl = calloc(1, sizeof(struct udev_ctrl));
84 struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path)
86 struct udev_ctrl *uctrl;
88 uctrl = udev_ctrl_new(udev);
92 uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET, 0);
93 if (uctrl->sock < 0) {
94 err(udev, "error getting socket: %m\n");
95 udev_ctrl_unref(uctrl);
99 uctrl->saddr.sun_family = AF_LOCAL;
100 strcpy(uctrl->saddr.sun_path, socket_path);
101 uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
102 /* translate leading '@' to abstract namespace */
103 if (uctrl->saddr.sun_path[0] == '@')
104 uctrl->saddr.sun_path[0] = '\0';
108 struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd)
110 struct udev_ctrl *uctrl;
112 uctrl = udev_ctrl_new(udev);
120 int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl)
124 if (uctrl->addrlen > 0) {
125 err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
128 err(uctrl->udev, "bind failed: %m\n");
131 err = listen(uctrl->sock, 0);
134 err(uctrl->udev, "listen failed: %m\n");
141 struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl)
146 struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl)
154 struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl)
159 if (uctrl->refcount > 0)
161 if (uctrl->sock >= 0)
167 int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
174 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
176 struct udev_ctrl_connection *conn;
179 conn = calloc(1, sizeof(struct udev_ctrl_connection));
185 conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC);
186 if (conn->sock < 0) {
191 /* enable receiving of the sender credentials */
192 setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
193 udev_ctrl_ref(uctrl);
197 struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn)
205 struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn)
210 if (conn->refcount > 0)
214 udev_ctrl_unref(conn->uctrl);
219 static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout)
221 struct udev_ctrl_msg_wire ctrl_msg_wire;
224 memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire));
225 strcpy(ctrl_msg_wire.version, "udev-" VERSION);
226 ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
227 ctrl_msg_wire.type = type;
230 util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
232 ctrl_msg_wire.intval = intval;
234 if (!uctrl->connected) {
235 if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) {
239 uctrl->connected = true;
241 if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
246 /* wait for peer message handling or disconnect */
248 struct pollfd pfd[1];
251 pfd[0].fd = uctrl->sock;
252 pfd[0].events = POLLIN;
253 r = poll(pfd, 1, timeout * 1000);
261 if (r > 0 && pfd[0].revents & POLLERR) {
274 int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout)
276 return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
279 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout)
281 return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
284 int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout)
286 return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
289 int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl, int timeout)
291 return ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL, timeout);
294 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout)
296 return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
299 int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout)
301 return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
304 int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout)
306 return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
309 int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout)
311 return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
314 struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
316 struct udev *udev = conn->uctrl->udev;
317 struct udev_ctrl_msg *uctrl_msg;
320 struct cmsghdr *cmsg;
323 char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
325 uctrl_msg = calloc(1, sizeof(struct udev_ctrl_msg));
326 if (uctrl_msg == NULL)
328 uctrl_msg->refcount = 1;
329 uctrl_msg->conn = conn;
330 udev_ctrl_connection_ref(conn);
332 iov.iov_base = &uctrl_msg->ctrl_msg_wire;
333 iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
334 memset(&smsg, 0x00, sizeof(struct msghdr));
337 smsg.msg_control = cred_msg;
338 smsg.msg_controllen = sizeof(cred_msg);
339 size = recvmsg(conn->sock, &smsg, 0);
341 err(udev, "unable to receive user udevd message: %m\n");
344 cmsg = CMSG_FIRSTHDR(&smsg);
345 cred = (struct ucred *) CMSG_DATA(cmsg);
347 if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
348 err(udev, "no sender credentials received, message ignored\n");
352 if (cred->uid != 0) {
353 err(udev, "sender uid=%i, message ignored\n", cred->uid);
357 if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
358 err(udev, "message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic);
362 dbg(udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg_wire.type);
365 udev_ctrl_msg_unref(uctrl_msg);
369 struct udev_ctrl_msg *udev_ctrl_msg_ref(struct udev_ctrl_msg *ctrl_msg)
371 if (ctrl_msg == NULL)
373 ctrl_msg->refcount++;
377 struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg)
379 if (ctrl_msg == NULL)
381 ctrl_msg->refcount--;
382 if (ctrl_msg->refcount > 0)
384 dbg(ctrl_msg->conn->uctrl->udev, "release ctrl_msg %p\n", ctrl_msg);
385 udev_ctrl_connection_unref(ctrl_msg->conn);
390 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg)
392 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
393 return ctrl_msg->ctrl_msg_wire.intval;
397 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
399 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE)
404 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
406 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE)
411 int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg)
413 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD_RULES)
418 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg)
420 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV)
421 return ctrl_msg->ctrl_msg_wire.buf;
425 int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg)
427 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
428 return ctrl_msg->ctrl_msg_wire.intval;
432 int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg)
434 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
439 int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg)
441 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)