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>
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,
33 UDEV_CTRL_RELOAD_RULES,
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 err(udev, "error getting socket: %m\n");
87 udev_ctrl_unref(uctrl);
95 uctrl->saddr.sun_family = AF_LOCAL;
96 util_strscpyl(uctrl->saddr.sun_path, sizeof(uctrl->saddr.sun_path),
97 udev_get_run_path(udev), "/control", NULL);
98 uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
102 struct udev_ctrl *udev_ctrl_new(struct udev *udev)
104 return udev_ctrl_new_from_fd(udev, -1);
107 int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl)
112 err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
113 if (err < 0 && errno == EADDRINUSE) {
114 unlink(uctrl->saddr.sun_path);
115 err = bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
120 err(uctrl->udev, "bind failed: %m\n");
124 err = listen(uctrl->sock, 0);
127 err(uctrl->udev, "listen failed: %m\n");
132 uctrl->cleanup_socket = true;
137 struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl)
142 struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl)
150 struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl)
155 if (uctrl->refcount > 0)
157 if (uctrl->sock >= 0)
163 int udev_ctrl_cleanup(struct udev_ctrl *uctrl)
165 if (uctrl->cleanup_socket)
166 unlink(uctrl->saddr.sun_path);
170 int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
177 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
179 struct udev_ctrl_connection *conn;
184 conn = calloc(1, sizeof(struct udev_ctrl_connection));
190 conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK);
191 if (conn->sock < 0) {
193 err(uctrl->udev, "unable to receive ctrl connection: %m\n");
197 /* check peer credential of connection */
198 slen = sizeof(ucred);
199 if (getsockopt(conn->sock, SOL_SOCKET, SO_PEERCRED, &ucred, &slen) < 0) {
200 err(uctrl->udev, "unable to receive credentials of ctrl connection: %m\n");
204 err(uctrl->udev, "sender uid=%i, message ignored\n", ucred.uid);
208 /* enable receiving of the sender credentials in the messages */
209 setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
210 udev_ctrl_ref(uctrl);
219 struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn)
227 struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn)
232 if (conn->refcount > 0)
236 udev_ctrl_unref(conn->uctrl);
241 static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout)
243 struct udev_ctrl_msg_wire ctrl_msg_wire;
246 memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire));
247 strcpy(ctrl_msg_wire.version, "udev-" VERSION);
248 ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
249 ctrl_msg_wire.type = type;
252 util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
254 ctrl_msg_wire.intval = intval;
256 if (!uctrl->connected) {
257 if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) {
261 uctrl->connected = true;
263 if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
268 /* wait for peer message handling or disconnect */
270 struct pollfd pfd[1];
273 pfd[0].fd = uctrl->sock;
274 pfd[0].events = POLLIN;
275 r = poll(pfd, 1, timeout * 1000);
283 if (r > 0 && pfd[0].revents & POLLERR) {
296 int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout)
298 return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
301 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout)
303 return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
306 int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout)
308 return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
311 int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl, int timeout)
313 return ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL, timeout);
316 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout)
318 return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
321 int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout)
323 return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
326 int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout)
328 return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
331 int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout)
333 return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
336 struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
338 struct udev *udev = conn->uctrl->udev;
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 err(udev, "timeout waiting for ctrl message\n");
371 if (!(pfd[0].revents & POLLIN)) {
372 err(udev, "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 err(udev, "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 err(udev, "no sender credentials received, message ignored\n");
400 if (cred->uid != 0) {
401 err(udev, "sender uid=%i, message ignored\n", cred->uid);
405 if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
406 err(udev, "message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic);
410 dbg(udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg_wire.type);
413 udev_ctrl_msg_unref(uctrl_msg);
417 struct udev_ctrl_msg *udev_ctrl_msg_ref(struct udev_ctrl_msg *ctrl_msg)
419 if (ctrl_msg == NULL)
421 ctrl_msg->refcount++;
425 struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg)
427 if (ctrl_msg == NULL)
429 ctrl_msg->refcount--;
430 if (ctrl_msg->refcount > 0)
432 dbg(ctrl_msg->conn->uctrl->udev, "release ctrl_msg %p\n", ctrl_msg);
433 udev_ctrl_connection_unref(ctrl_msg->conn);
438 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg)
440 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
441 return ctrl_msg->ctrl_msg_wire.intval;
445 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
447 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE)
452 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
454 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE)
459 int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg)
461 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD_RULES)
466 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg)
468 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV)
469 return ctrl_msg->ctrl_msg_wire.buf;
473 int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg)
475 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
476 return ctrl_msg->ctrl_msg_wire.intval;
480 int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg)
482 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
487 int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg)
489 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)