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)
159 if (uctrl->cleanup_socket)
160 unlink(uctrl->saddr.sun_path);
165 int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
172 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
174 struct udev_ctrl_connection *conn;
179 conn = calloc(1, sizeof(struct udev_ctrl_connection));
185 conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK);
186 if (conn->sock < 0) {
188 err(uctrl->udev, "unable to receive ctrl connection: %m\n");
192 /* check peer credential of connection */
193 slen = sizeof(ucred);
194 if (getsockopt(conn->sock, SOL_SOCKET, SO_PEERCRED, &ucred, &slen) < 0) {
195 err(uctrl->udev, "unable to receive credentials of ctrl connection: %m\n");
199 err(uctrl->udev, "sender uid=%i, message ignored\n", ucred.uid);
203 /* enable receiving of the sender credentials in the messages */
204 setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
205 udev_ctrl_ref(uctrl);
214 struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn)
222 struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn)
227 if (conn->refcount > 0)
231 udev_ctrl_unref(conn->uctrl);
236 static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout)
238 struct udev_ctrl_msg_wire ctrl_msg_wire;
241 memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire));
242 strcpy(ctrl_msg_wire.version, "udev-" VERSION);
243 ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
244 ctrl_msg_wire.type = type;
247 util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
249 ctrl_msg_wire.intval = intval;
251 if (!uctrl->connected) {
252 if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) {
256 uctrl->connected = true;
258 if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
263 /* wait for peer message handling or disconnect */
265 struct pollfd pfd[1];
268 pfd[0].fd = uctrl->sock;
269 pfd[0].events = POLLIN;
270 r = poll(pfd, 1, timeout * 1000);
278 if (r > 0 && pfd[0].revents & POLLERR) {
291 int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout)
293 return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
296 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout)
298 return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
301 int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout)
303 return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
306 int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl, int timeout)
308 return ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL, timeout);
311 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout)
313 return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
316 int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout)
318 return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
321 int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout)
323 return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
326 int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout)
328 return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
331 struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
333 struct udev *udev = conn->uctrl->udev;
334 struct udev_ctrl_msg *uctrl_msg;
337 struct cmsghdr *cmsg;
340 char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
342 uctrl_msg = calloc(1, sizeof(struct udev_ctrl_msg));
343 if (uctrl_msg == NULL)
345 uctrl_msg->refcount = 1;
346 uctrl_msg->conn = conn;
347 udev_ctrl_connection_ref(conn);
349 /* wait for the incoming message */
351 struct pollfd pfd[1];
354 pfd[0].fd = conn->sock;
355 pfd[0].events = POLLIN;
357 r = poll(pfd, 1, 10000);
363 err(udev, "timeout waiting for ctrl message\n");
366 if (!(pfd[0].revents & POLLIN)) {
367 err(udev, "ctrl connection error: %m\n");
375 iov.iov_base = &uctrl_msg->ctrl_msg_wire;
376 iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
377 memset(&smsg, 0x00, sizeof(struct msghdr));
380 smsg.msg_control = cred_msg;
381 smsg.msg_controllen = sizeof(cred_msg);
382 size = recvmsg(conn->sock, &smsg, 0);
384 err(udev, "unable to receive ctrl message: %m\n");
387 cmsg = CMSG_FIRSTHDR(&smsg);
388 cred = (struct ucred *) CMSG_DATA(cmsg);
390 if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
391 err(udev, "no sender credentials received, message ignored\n");
395 if (cred->uid != 0) {
396 err(udev, "sender uid=%i, message ignored\n", cred->uid);
400 if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
401 err(udev, "message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic);
405 dbg(udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg_wire.type);
408 udev_ctrl_msg_unref(uctrl_msg);
412 struct udev_ctrl_msg *udev_ctrl_msg_ref(struct udev_ctrl_msg *ctrl_msg)
414 if (ctrl_msg == NULL)
416 ctrl_msg->refcount++;
420 struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg)
422 if (ctrl_msg == NULL)
424 ctrl_msg->refcount--;
425 if (ctrl_msg->refcount > 0)
427 dbg(ctrl_msg->conn->uctrl->udev, "release ctrl_msg %p\n", ctrl_msg);
428 udev_ctrl_connection_unref(ctrl_msg->conn);
433 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg)
435 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
436 return ctrl_msg->ctrl_msg_wire.intval;
440 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
442 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE)
447 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
449 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE)
454 int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg)
456 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD_RULES)
461 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg)
463 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV)
464 return ctrl_msg->ctrl_msg_wire.buf;
468 int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg)
470 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
471 return ctrl_msg->ctrl_msg_wire.intval;
475 int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg)
477 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
482 int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg)
484 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)