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,
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 log_error("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 log_error("bind failed: %m\n");
124 err = listen(uctrl->sock, 0);
127 log_error("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)
167 if (uctrl->cleanup_socket)
168 unlink(uctrl->saddr.sun_path);
172 int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
179 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
181 struct udev_ctrl_connection *conn;
186 conn = calloc(1, sizeof(struct udev_ctrl_connection));
192 conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK);
193 if (conn->sock < 0) {
195 log_error("unable to receive ctrl connection: %m\n");
199 /* check peer credential of connection */
200 slen = sizeof(ucred);
201 if (getsockopt(conn->sock, SOL_SOCKET, SO_PEERCRED, &ucred, &slen) < 0) {
202 log_error("unable to receive credentials of ctrl connection: %m\n");
206 log_error("sender uid=%i, message ignored\n", ucred.uid);
210 /* enable receiving of the sender credentials in the messages */
211 setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
212 udev_ctrl_ref(uctrl);
221 struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn)
229 struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn)
234 if (conn->refcount > 0)
238 udev_ctrl_unref(conn->uctrl);
243 static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout)
245 struct udev_ctrl_msg_wire ctrl_msg_wire;
248 memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire));
249 strcpy(ctrl_msg_wire.version, "udev-" VERSION);
250 ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
251 ctrl_msg_wire.type = type;
254 util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
256 ctrl_msg_wire.intval = intval;
258 if (!uctrl->connected) {
259 if (connect(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen) < 0) {
263 uctrl->connected = true;
265 if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
270 /* wait for peer message handling or disconnect */
272 struct pollfd pfd[1];
275 pfd[0].fd = uctrl->sock;
276 pfd[0].events = POLLIN;
277 r = poll(pfd, 1, timeout * 1000);
285 if (r > 0 && pfd[0].revents & POLLERR) {
298 int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout)
300 return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
303 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout)
305 return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
308 int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout)
310 return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
313 int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout)
315 return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout);
318 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout)
320 return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
323 int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout)
325 return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
328 int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout)
330 return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
333 int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout)
335 return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
338 struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
340 struct udev_ctrl_msg *uctrl_msg;
343 struct cmsghdr *cmsg;
346 char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
348 uctrl_msg = calloc(1, sizeof(struct udev_ctrl_msg));
349 if (uctrl_msg == NULL)
351 uctrl_msg->refcount = 1;
352 uctrl_msg->conn = conn;
353 udev_ctrl_connection_ref(conn);
355 /* wait for the incoming message */
357 struct pollfd pfd[1];
360 pfd[0].fd = conn->sock;
361 pfd[0].events = POLLIN;
363 r = poll(pfd, 1, 10000);
369 log_error("timeout waiting for ctrl message\n");
372 if (!(pfd[0].revents & POLLIN)) {
373 log_error("ctrl connection error: %m\n");
381 iov.iov_base = &uctrl_msg->ctrl_msg_wire;
382 iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
383 memset(&smsg, 0x00, sizeof(struct msghdr));
386 smsg.msg_control = cred_msg;
387 smsg.msg_controllen = sizeof(cred_msg);
388 size = recvmsg(conn->sock, &smsg, 0);
390 log_error("unable to receive ctrl message: %m\n");
393 cmsg = CMSG_FIRSTHDR(&smsg);
394 cred = (struct ucred *) CMSG_DATA(cmsg);
396 if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
397 log_error("no sender credentials received, message ignored\n");
401 if (cred->uid != 0) {
402 log_error("sender uid=%i, message ignored\n", cred->uid);
406 if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
407 log_error("message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic);
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 udev_ctrl_connection_unref(ctrl_msg->conn);
437 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg)
439 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
440 return ctrl_msg->ctrl_msg_wire.intval;
444 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
446 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE)
451 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
453 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE)
458 int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg)
460 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD)
465 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg)
467 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV)
468 return ctrl_msg->ctrl_msg_wire.buf;
472 int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg)
474 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
475 return ctrl_msg->ctrl_msg_wire.intval;
479 int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg)
481 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
486 int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg)
488 if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)