/*
- * udevd.c - hotplug event serializer
- *
- * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
*
- *
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
+#include <syslog.h>
+#include <time.h>
+#include <getopt.h>
#include <sys/select.h>
#include <sys/wait.h>
-#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
-#include <sys/sysinfo.h>
#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/netlink.h>
-#include "list.h"
-#include "udev_libc_wrapper.h"
#include "udev.h"
-#include "udev_version.h"
-#include "udev_utils.h"
+#include "udev_rules.h"
#include "udevd.h"
-#include "logging.h"
+#include "udev_selinux.h"
+
+static int verbose;
-/* global variables*/
-static int udevsendsock;
+static struct udev_rules rules;
+static int udevd_sock = -1;
+static int uevent_netlink_sock = -1;
+static int inotify_fd = -1;
static pid_t sid;
-static int pipefds[2];
-static long startup_time;
-static unsigned long long expected_seqnum = 0;
+static int signal_pipe[2] = {-1, -1};
static volatile int sigchilds_waiting;
-static volatile int run_msg_q;
-static volatile int sig_flag;
+static volatile int udev_exit;
+static volatile int reload_config;
static int run_exec_q;
+static int stop_exec_q;
+static int max_childs;
+static int max_childs_running;
+static char udev_log[32];
-static LIST_HEAD(msg_list);
static LIST_HEAD(exec_list);
static LIST_HEAD(running_list);
-static void exec_queue_manager(void);
-static void msg_queue_manager(void);
-static void user_sighandler(void);
-static void reap_sigchilds(void);
-char *udev_bin;
#ifdef USE_LOG
-void log_message (int priority, const char *format, ...)
+void log_message(int priority, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
-}
-#endif
-static void msg_dump_queue(void)
-{
-#ifdef DEBUG
- struct hotplug_msg *msg;
+ if (verbose) {
+ va_start(args, format);
+ vprintf(format, args);
+ va_end(args);
+ printf("\n");
+ }
+}
- list_for_each_entry(msg, &msg_list, node)
- dbg("sequence %llu in queue", msg->seqnum);
#endif
-}
-static void run_queue_delete(struct hotplug_msg *msg)
+static void asmlinkage udev_event_sig_handler(int signum)
{
- list_del(&msg->node);
- free(msg);
+ if (signum == SIGALRM)
+ exit(1);
}
-/* orders the message in the queue by sequence number */
-static void msg_queue_insert(struct hotplug_msg *msg)
+static int udev_event_process(struct udevd_uevent_msg *msg)
{
- struct hotplug_msg *loop_msg;
- struct sysinfo info;
+ struct sigaction act;
+ struct udevice *udev;
+ int i;
+ int retval;
- if (msg->seqnum == 0) {
- dbg("no SEQNUM, move straight to the exec queue");
- list_add(&msg->node, &exec_list);
- run_exec_q = 1;
- return;
+ /* set signal handlers */
+ memset(&act, 0x00, sizeof(act));
+ act.sa_handler = (void (*)(int)) udev_event_sig_handler;
+ sigemptyset (&act.sa_mask);
+ act.sa_flags = 0;
+ sigaction(SIGALRM, &act, NULL);
+
+ /* reset to default */
+ act.sa_handler = SIG_DFL;
+ sigaction(SIGINT, &act, NULL);
+ sigaction(SIGTERM, &act, NULL);
+ sigaction(SIGCHLD, &act, NULL);
+ sigaction(SIGHUP, &act, NULL);
+
+ /* trigger timeout to prevent hanging processes */
+ alarm(UDEV_ALARM_TIMEOUT);
+
+ /* reconstruct event environment from message */
+ for (i = 0; msg->envp[i]; i++)
+ putenv(msg->envp[i]);
+
+ udev = udev_device_init();
+ if (udev == NULL)
+ return -1;
+ strlcpy(udev->action, msg->action, sizeof(udev->action));
+ sysfs_device_set_values(udev->dev, msg->devpath, msg->subsystem, msg->driver);
+ udev->devt = msg->devt;
+
+ retval = udev_device_event(&rules, udev);
+
+ /* run programs collected by RUN-key*/
+ if (retval == 0 && !udev->ignore_device && udev_run) {
+ struct name_entry *name_loop;
+
+ dbg("executing run list");
+ list_for_each_entry(name_loop, &udev->run_list, node) {
+ if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
+ pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action);
+ else {
+ char program[PATH_SIZE];
+
+ strlcpy(program, name_loop->name, sizeof(program));
+ udev_rules_apply_format(udev, program, sizeof(program));
+ if (run_program(program, udev->dev->subsystem, NULL, 0, NULL,
+ (udev_log_priority >= LOG_INFO)))
+ retval = -1;
+ }
+ }
}
- /* don't delay messages with timeout set */
- if (msg->timeout) {
- dbg("move seq %llu with timeout %u to exec queue", msg->seqnum, msg->timeout);
- list_add(&msg->node, &exec_list);
- run_exec_q = 1;
+ udev_device_cleanup(udev);
+ return retval;
+}
+
+enum event_state {
+ EVENT_QUEUED,
+ EVENT_FINISHED,
+ EVENT_FAILED,
+};
+
+static void export_event_state(struct udevd_uevent_msg *msg, enum event_state state)
+{
+ char filename[PATH_SIZE];
+ char filename_failed[PATH_SIZE];
+ size_t start, end, i;
+ struct udevd_uevent_msg *loop_msg;
+ int fd;
+
+ /* add location of queue files */
+ strlcpy(filename, udev_root, sizeof(filename));
+ strlcat(filename, "/", sizeof(filename));
+ start = strlcat(filename, EVENT_QUEUE_DIR, sizeof(filename));
+ end = strlcat(filename, msg->devpath, sizeof(filename));
+ if (end > sizeof(filename))
+ end = sizeof(filename);
+
+ /* replace '/' to transform path into a filename */
+ for (i = start+1; i < end; i++)
+ if (filename[i] == '/')
+ filename[i] = PATH_TO_NAME_CHAR;
+
+ /* add location of failed files */
+ strlcpy(filename_failed, udev_root, sizeof(filename_failed));
+ strlcat(filename_failed, "/", sizeof(filename_failed));
+ start = strlcat(filename_failed, EVENT_FAILED_DIR, sizeof(filename_failed));
+ end = strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
+ if (end > sizeof(filename_failed))
+ end = sizeof(filename_failed);
+
+ /* replace '/' to transform path into a filename */
+ for (i = start+1; i < end; i++)
+ if (filename_failed[i] == '/')
+ filename_failed[i] = PATH_TO_NAME_CHAR;
+
+ switch (state) {
+ case EVENT_QUEUED:
+ unlink(filename_failed);
+ delete_path(filename_failed);
+ create_path(filename);
+ fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
+ if (fd > 0)
+ close(fd);
return;
- }
+ case EVENT_FINISHED:
+ case EVENT_FAILED:
+ unlink(filename_failed);
+ delete_path(filename_failed);
+
+ /* don't remove, if events for the same path are still pending */
+ list_for_each_entry(loop_msg, &running_list, node)
+ if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
+ return;
- /* sort message by sequence number into list */
- list_for_each_entry_reverse(loop_msg, &msg_list, node) {
- if (loop_msg->seqnum < msg->seqnum)
- break;
+ list_for_each_entry(loop_msg, &exec_list, node)
+ if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
+ return;
- if (loop_msg->seqnum == msg->seqnum) {
- info("ignoring duplicate message seq %llu", msg->seqnum);
- return;
+ /* move failed events to the failed directory */
+ if (state == EVENT_FAILED) {
+ create_path(filename_failed);
+ rename(filename, filename_failed);
+ } else {
+ unlink(filename);
}
- }
- /* store timestamp of queuing */
- sysinfo(&info);
- msg->queue_time = info.uptime;
+ /* clean up the queue directory */
+ delete_path(filename);
- list_add(&msg->node, &loop_msg->node);
- dbg("queued message seq %llu", msg->seqnum);
+ return;
+ }
+}
- /* run msg queue manager */
- run_msg_q = 1;
+static void msg_queue_delete(struct udevd_uevent_msg *msg)
+{
+ list_del(&msg->node);
- return;
+ /* mark as failed, if add event returns non-zero */
+ if (msg->exitstatus && strcmp(msg->action, "add") == 0)
+ export_event_state(msg, EVENT_FAILED);
+ else
+ export_event_state(msg, EVENT_FINISHED);
+
+ free(msg);
}
-/* forks event and removes event from run queue when finished */
-static void udev_run(struct hotplug_msg *msg)
+static void udev_event_run(struct udevd_uevent_msg *msg)
{
- char *const argv[] = { "udev", msg->subsystem, NULL };
pid_t pid;
+ int retval;
pid = fork();
switch (pid) {
case 0:
/* child */
- close(udevsendsock);
+ close(uevent_netlink_sock);
+ close(udevd_sock);
+ if (inotify_fd >= 0)
+ close(inotify_fd);
+ close(signal_pipe[READ_END]);
+ close(signal_pipe[WRITE_END]);
logging_close();
+ logging_init("udevd-event");
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
- execve(udev_bin, argv, msg->envp);
- err("exec of child failed");
- _exit(1);
- break;
+
+ retval = udev_event_process(msg);
+ info("seq %llu finished", msg->seqnum);
+
+ logging_close();
+ if (retval)
+ exit(1);
+ exit(0);
case -1:
- err("fork of child failed");
- run_queue_delete(msg);
+ err("fork of child failed: %s", strerror(errno));
+ msg_queue_delete(msg);
break;
default:
/* get SIGCHLD in main loop */
- dbg("==> exec seq %llu [%d] working at '%s'", msg->seqnum, pid, msg->devpath);
+ info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old",
+ msg->seqnum, pid, msg->action, msg->subsystem, time(NULL) - msg->queue_time);
msg->pid = pid;
}
}
+static void msg_queue_insert(struct udevd_uevent_msg *msg)
+{
+ char filename[PATH_SIZE];
+ int fd;
+
+ msg->queue_time = time(NULL);
+
+ strlcpy(filename, udev_root, sizeof(filename));
+ strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
+ fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
+ if (fd >= 0) {
+ char str[32];
+ int len;
+
+ len = sprintf(str, "%llu\n", msg->seqnum);
+ write(fd, str, len);
+ close(fd);
+ }
+
+ export_event_state(msg, EVENT_QUEUED);
+
+ /* run all events with a timeout set immediately */
+ if (msg->timeout != 0) {
+ list_add_tail(&msg->node, &running_list);
+ udev_event_run(msg);
+ return;
+ }
+
+ list_add_tail(&msg->node, &exec_list);
+ run_exec_q = 1;
+}
+
+static int mem_size_mb(void)
+{
+ int f;
+ char buf[8192];
+ long int len;
+ const char *pos;
+ long int memsize;
+
+ f = open("/proc/meminfo", O_RDONLY);
+ if (f == -1)
+ return -1;
+
+ len = read(f, buf, sizeof(buf)-1);
+ close(f);
+
+ if (len <= 0)
+ return -1;
+ buf[len] = '\0';
+
+ pos = strstr(buf, "MemTotal: ");
+ if (pos == NULL)
+ return -1;
+
+ if (sscanf(pos, "MemTotal: %ld kB", &memsize) != 1)
+ return -1;
+
+ return memsize / 1024;
+}
+
+static int cpu_count(void)
+{
+ int f;
+ char buf[32768];
+ int len;
+ const char *pos;
+ int count = 0;
+
+ f = open("/proc/stat", O_RDONLY);
+ if (f == -1)
+ return -1;
+
+ len = read(f, buf, sizeof(buf)-1);
+ close(f);
+ if (len <= 0)
+ return -1;
+ buf[len] = '\0';
+
+ pos = strstr(buf, "cpu");
+ if (pos == NULL)
+ return -1;
+
+ while (pos != NULL) {
+ if (strncmp(pos, "cpu", 3) == 0 &&isdigit(pos[3]))
+ count++;
+ pos = strstr(&pos[3], "cpu");
+ }
+
+ if (count == 0)
+ return -1;
+ return count;
+}
+
static int running_processes(void)
{
int f;
- static char buf[4096];
+ char buf[32768];
int len;
int running;
const char *pos;
if (f == -1)
return -1;
- len = read(f, buf, sizeof(buf));
+ len = read(f, buf, sizeof(buf)-1);
close(f);
-
if (len <= 0)
return -1;
- else
- buf[len] = '\0';
+ buf[len] = '\0';
pos = strstr(buf, "procs_running ");
if (pos == NULL)
if (f == -1)
continue;
- len = read(f, line, sizeof(line));
+ len = read(f, line, sizeof(line)-1);
close(f);
if (len <= 0)
}
/* returns still running task for the same device, its parent or its physical device */
-static struct hotplug_msg *running_with_devpath(struct hotplug_msg *msg)
+static int running_with_devpath(struct udevd_uevent_msg *msg, int limit)
{
- struct hotplug_msg *loop_msg;
-
- if (msg->devpath == NULL)
- return NULL;
-
- /* skip any events with a timeout set */
- if (msg->timeout)
- return NULL;
+ struct udevd_uevent_msg *loop_msg;
+ int childs_count = 0;
list_for_each_entry(loop_msg, &running_list, node) {
- if (loop_msg->devpath == NULL)
- continue;
+ if (limit && childs_count++ > limit) {
+ dbg("%llu, maximum number (%i) of child reached", msg->seqnum, childs_count);
+ return 1;
+ }
/* return running parent/child device event */
- if (compare_devpath(loop_msg->devpath, msg->devpath) != 0)
- return loop_msg;
+ if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
+ dbg("%llu, child device event still running %llu (%s)",
+ msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+ return 2;
+ }
/* return running physical device event */
if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
- if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0)
- return loop_msg;
+ if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
+ dbg("%llu, physical device event still running %llu (%s)",
+ msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+ return 3;
+ }
}
- return NULL;
+ return 0;
}
/* exec queue management routine executes the events and serializes events in the same sequence */
-static void exec_queue_manager(void)
+static void msg_queue_manager(void)
{
- struct hotplug_msg *loop_msg;
- struct hotplug_msg *tmp_msg;
- struct hotplug_msg *msg;
+ struct udevd_uevent_msg *loop_msg;
+ struct udevd_uevent_msg *tmp_msg;
int running;
+ if (list_empty(&exec_list))
+ return;
+
running = running_processes();
dbg("%d processes runnning on system", running);
if (running < 0)
- running = THROTTLE_MAX_RUNNING_CHILDS;
+ running = max_childs_running;
list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
/* check running processes in our session and possibly throttle */
- if (running >= THROTTLE_MAX_RUNNING_CHILDS) {
- running = running_processes_in_session(sid, THROTTLE_MAX_RUNNING_CHILDS+10);
- dbg("%d processes running in session", running);
- if (running >= THROTTLE_MAX_RUNNING_CHILDS) {
- dbg("delay seq %llu, cause too many processes already running", loop_msg->seqnum);
+ if (running >= max_childs_running) {
+ running = running_processes_in_session(sid, max_childs_running+10);
+ dbg("at least %d processes running in session", running);
+ if (running >= max_childs_running) {
+ dbg("delay seq %llu, too many processes already running", loop_msg->seqnum);
return;
}
}
- msg = running_with_devpath(loop_msg);
- if (!msg) {
- /* move event to run list */
- list_move_tail(&loop_msg->node, &running_list);
- udev_run(loop_msg);
- running++;
- dbg("moved seq %llu to running list", loop_msg->seqnum);
- } else {
- dbg("delay seq %llu (%s), cause seq %llu (%s) is still running",
- loop_msg->seqnum, loop_msg->devpath, msg->seqnum, msg->devpath);
+ /* don't run two processes for the same devpath and wait for the parent*/
+ if (running_with_devpath(loop_msg, max_childs)) {
+ dbg("delay seq %llu (%s)", loop_msg->seqnum, loop_msg->devpath);
+ continue;
}
+
+ /* move event to run list */
+ list_move_tail(&loop_msg->node, &running_list);
+ udev_event_run(loop_msg);
+ running++;
+ dbg("moved seq %llu to running list", loop_msg->seqnum);
}
}
-static void msg_move_exec(struct hotplug_msg *msg)
+static struct udevd_uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size)
{
- list_move_tail(&msg->node, &exec_list);
- run_exec_q = 1;
- expected_seqnum = msg->seqnum+1;
- dbg("moved seq %llu to exec, next expected is %llu",
- msg->seqnum, expected_seqnum);
-}
+ int bufpos;
+ int i;
+ struct udevd_uevent_msg *msg;
+ char *physdevdriver_key = NULL;
+ int maj = 0;
+ int min = 0;
-/* msg queue management routine handles the timeouts and dispatches the events */
-static void msg_queue_manager(void)
-{
- struct hotplug_msg *loop_msg;
- struct hotplug_msg *tmp_msg;
- struct sysinfo info;
- long msg_age = 0;
- static int timeout = EVENT_INIT_TIMEOUT_SEC;
- static int init = 1;
-
- dbg("msg queue manager, next expected is %llu", expected_seqnum);
-recheck:
- list_for_each_entry_safe(loop_msg, tmp_msg, &msg_list, node) {
- /* move event with expected sequence to the exec list */
- if (loop_msg->seqnum == expected_seqnum) {
- msg_move_exec(loop_msg);
- continue;
- }
+ msg = malloc(sizeof(struct udevd_uevent_msg) + buf_size);
+ if (msg == NULL)
+ return NULL;
+ memset(msg, 0x00, sizeof(struct udevd_uevent_msg) + buf_size);
- /* see if we are in the initialization phase and wait for the very first events */
- if (init && (info.uptime - startup_time >= INIT_TIME_SEC)) {
- init = 0;
- timeout = EVENT_TIMEOUT_SEC;
- dbg("initialization phase passed, set timeout to %i seconds", EVENT_TIMEOUT_SEC);
- }
+ /* copy environment buffer and reconstruct envp */
+ memcpy(msg->envbuf, buf, buf_size);
+ bufpos = 0;
+ for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
+ int keylen;
+ char *key;
- /* move event with expired timeout to the exec list */
- sysinfo(&info);
- msg_age = info.uptime - loop_msg->queue_time;
- dbg("seq %llu is %li seconds old", loop_msg->seqnum, msg_age);
- if (msg_age >= timeout) {
- msg_move_exec(loop_msg);
- goto recheck;
- } else {
- break;
- }
+ key = &msg->envbuf[bufpos];
+ keylen = strlen(key);
+ msg->envp[i] = key;
+ bufpos += keylen + 1;
+ dbg("add '%s' to msg.envp[%i]", msg->envp[i], i);
+
+ /* remember some keys for further processing */
+ if (strncmp(key, "ACTION=", 7) == 0)
+ msg->action = &key[7];
+ else if (strncmp(key, "DEVPATH=", 8) == 0)
+ msg->devpath = &key[8];
+ else if (strncmp(key, "SUBSYSTEM=", 10) == 0)
+ msg->subsystem = &key[10];
+ else if (strncmp(key, "DRIVER=", 7) == 0)
+ msg->driver = &key[7];
+ else if (strncmp(key, "SEQNUM=", 7) == 0)
+ msg->seqnum = strtoull(&key[7], NULL, 10);
+ else if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
+ msg->physdevpath = &key[12];
+ else if (strncmp(key, "PHYSDEVDRIVER=", 14) == 0)
+ physdevdriver_key = key;
+ else if (strncmp(key, "MAJOR=", 6) == 0)
+ maj = strtoull(&key[6], NULL, 10);
+ else if (strncmp(key, "MINOR=", 6) == 0)
+ min = strtoull(&key[6], NULL, 10);
+ else if (strncmp(key, "TIMEOUT=", 8) == 0)
+ msg->timeout = strtoull(&key[8], NULL, 10);
}
+ msg->devt = makedev(maj, min);
+ msg->envp[i++] = "UDEVD_EVENT=1";
- msg_dump_queue();
+ if (msg->driver == NULL && msg->physdevpath == NULL && physdevdriver_key != NULL) {
+ /* for older kernels DRIVER is empty for a bus device, export PHYSDEVDRIVER as DRIVER */
+ msg->envp[i++] = &physdevdriver_key[7];
+ msg->driver = &physdevdriver_key[14];
+ }
- /* set timeout for remaining queued events */
- if (list_empty(&msg_list) == 0) {
- struct itimerval itv = {{0, 0}, {timeout - msg_age, 0}};
- dbg("next event expires in %li seconds", timeout - msg_age);
- setitimer(ITIMER_REAL, &itv, NULL);
+ msg->envp[i] = NULL;
+
+ if (msg->devpath == NULL || msg->action == NULL) {
+ info("DEVPATH or ACTION missing, ignore message");
+ free(msg);
+ return NULL;
}
+ return msg;
}
-/* receive the udevsend message and do some sanity checks */
-static struct hotplug_msg *get_udevsend_msg(void)
+/* receive the udevd message from userspace */
+static void get_ctrl_msg(void)
{
- static struct udevsend_msg usend_msg;
- struct hotplug_msg *msg;
- int bufpos;
- int i;
+ struct udevd_ctrl_msg ctrl_msg;
ssize_t size;
struct msghdr smsg;
struct cmsghdr *cmsg;
struct iovec iov;
struct ucred *cred;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
- int envbuf_size;
+ int *intval;
- memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
- iov.iov_base = &usend_msg;
- iov.iov_len = sizeof(struct udevsend_msg);
+ memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
+ iov.iov_base = &ctrl_msg;
+ iov.iov_len = sizeof(struct udevd_ctrl_msg);
memset(&smsg, 0x00, sizeof(struct msghdr));
smsg.msg_iov = &iov;
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
- size = recvmsg(udevsendsock, &smsg, 0);
+ size = recvmsg(udevd_sock, &smsg, 0);
if (size < 0) {
if (errno != EINTR)
- dbg("unable to receive udevsend message");
- return NULL;
+ err("unable to receive user udevd message: %s", strerror(errno));
+ return;
}
cmsg = CMSG_FIRSTHDR(&smsg);
cred = (struct ucred *) CMSG_DATA(cmsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- info("no sender credentials received, message ignored");
- return NULL;
+ err("no sender credentials received, message ignored");
+ return;
}
if (cred->uid != 0) {
- info("sender uid=%i, message ignored", cred->uid);
- return NULL;
+ err("sender uid=%i, message ignored", cred->uid);
+ return;
}
- if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
- info("message magic '%s' doesn't match, ignore it", usend_msg.magic);
- return NULL;
+ if (strncmp(ctrl_msg.magic, UDEVD_CTRL_MAGIC, sizeof(UDEVD_CTRL_MAGIC)) != 0 ) {
+ err("message magic '%s' doesn't match, ignore it", ctrl_msg.magic);
+ return;
}
- envbuf_size = size - offsetof(struct udevsend_msg, envbuf);
- dbg("envbuf_size=%i", envbuf_size);
- msg = malloc(sizeof(struct hotplug_msg) + envbuf_size);
- if (msg == NULL)
- return NULL;
-
- memset(msg, 0x00, sizeof(struct hotplug_msg) + envbuf_size);
-
- /* copy environment buffer and reconstruct envp */
- memcpy(msg->envbuf, usend_msg.envbuf, envbuf_size);
- bufpos = 0;
- for (i = 0; (bufpos < envbuf_size) && (i < HOTPLUG_NUM_ENVP-2); i++) {
- int keylen;
- char *key;
+ switch (ctrl_msg.type) {
+ case UDEVD_CTRL_STOP_EXEC_QUEUE:
+ info("udevd message (STOP_EXEC_QUEUE) received");
+ stop_exec_q = 1;
+ break;
+ case UDEVD_CTRL_START_EXEC_QUEUE:
+ info("udevd message (START_EXEC_QUEUE) received");
+ stop_exec_q = 0;
+ msg_queue_manager();
+ break;
+ case UDEVD_CTRL_SET_LOG_LEVEL:
+ intval = (int *) ctrl_msg.buf;
+ info("udevd message (SET_LOG_PRIORITY) received, udev_log_priority=%i", *intval);
+ udev_log_priority = *intval;
+ sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
+ putenv(udev_log);
+ break;
+ case UDEVD_CTRL_SET_MAX_CHILDS:
+ intval = (int *) ctrl_msg.buf;
+ info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval);
+ max_childs = *intval;
+ break;
+ case UDEVD_CTRL_SET_MAX_CHILDS_RUNNING:
+ intval = (int *) ctrl_msg.buf;
+ info("udevd message (UDEVD_SET_MAX_CHILDS_RUNNING) received, max_childs=%i", *intval);
+ max_childs_running = *intval;
+ break;
+ case UDEVD_CTRL_RELOAD_RULES:
+ info("udevd message (RELOAD_RULES) received");
+ reload_config = 1;
+ break;
+ default:
+ err("unknown control message type");
+ }
+}
- key = &msg->envbuf[bufpos];
- keylen = strlen(key);
- msg->envp[i] = key;
- bufpos += keylen + 1;
- dbg("add '%s' to msg.envp[%i]", msg->envp[i], i);
+/* receive the kernel user event message and do some sanity checks */
+static struct udevd_uevent_msg *get_netlink_msg(void)
+{
+ struct udevd_uevent_msg *msg;
+ int bufpos;
+ ssize_t size;
+ static char buffer[UEVENT_BUFFER_SIZE+512];
+ char *pos;
- /* remember some keys for further processing */
- if (strncmp(key, "ACTION=", 7) == 0)
- msg->action = &key[7];
+ size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
+ if (size < 0) {
+ if (errno != EINTR)
+ err("unable to receive kernel netlink message: %s", strerror(errno));
+ return NULL;
+ }
- if (strncmp(key, "DEVPATH=", 8) == 0)
- msg->devpath = &key[8];
+ if ((size_t)size > sizeof(buffer)-1)
+ size = sizeof(buffer)-1;
+ buffer[size] = '\0';
+ dbg("uevent_size=%zi", size);
- if (strncmp(key, "SUBSYSTEM=", 10) == 0)
- msg->subsystem = &key[10];
+ /* start of event payload */
+ bufpos = strlen(buffer)+1;
+ msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos);
+ if (msg == NULL)
+ return NULL;
- if (strncmp(key, "SEQNUM=", 7) == 0)
- msg->seqnum = strtoull(&key[7], NULL, 10);
+ /* validate message */
+ pos = strchr(buffer, '@');
+ if (pos == NULL) {
+ err("invalid uevent '%s'", buffer);
+ free(msg);
+ return NULL;
+ }
+ pos[0] = '\0';
- if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
- msg->physdevpath = &key[12];
+ if (msg->action == NULL) {
+ info("no ACTION in payload found, skip event '%s'", buffer);
+ free(msg);
+ return NULL;
+ }
- if (strncmp(key, "TIMEOUT=", 8) == 0)
- msg->timeout = strtoull(&key[8], NULL, 10);
+ if (strcmp(msg->action, buffer) != 0) {
+ err("ACTION in payload does not match uevent, skip event '%s'", buffer);
+ free(msg);
+ return NULL;
}
- msg->envp[i++] = "UDEVD_EVENT=1";
- msg->envp[i] = NULL;
return msg;
}
static void asmlinkage sig_handler(int signum)
{
- int rc;
-
switch (signum) {
case SIGINT:
case SIGTERM:
- exit(20 + signum);
- break;
- case SIGALRM:
- /* set flag, then write to pipe if needed */
- run_msg_q = 1;
- goto do_write;
+ udev_exit = 1;
break;
case SIGCHLD:
/* set flag, then write to pipe if needed */
sigchilds_waiting = 1;
- goto do_write;
+ break;
+ case SIGHUP:
+ reload_config = 1;
break;
}
-do_write:
- /* if pipe is empty, write to pipe to force select to return
- * immediately when it gets called
- */
- if (!sig_flag) {
- rc = write(pipefds[1],&signum,sizeof(signum));
- if (rc >= 0)
- sig_flag = 1;
- }
+ /* write to pipe, which will wakeup select() in our mainloop */
+ write(signal_pipe[WRITE_END], "", 1);
}
-static void udev_done(int pid)
+static void udev_done(int pid, int exitstatus)
{
/* find msg associated with pid and delete it */
- struct hotplug_msg *msg;
+ struct udevd_uevent_msg *msg;
list_for_each_entry(msg, &running_list, node) {
if (msg->pid == pid) {
- dbg("<== exec seq %llu came back", msg->seqnum);
- run_queue_delete(msg);
+ info("seq %llu, pid [%d] exit with %i, %ld seconds old", msg->seqnum, msg->pid,
+ exitstatus, time(NULL) - msg->queue_time);
+ msg->exitstatus = exitstatus;
+ msg_queue_delete(msg);
- /* we want to run the exec queue manager since there may
- * be events waiting with the devpath of the one that
- * just finished
- */
+ /* there may be events waiting with the same devpath */
run_exec_q = 1;
return;
}
static void reap_sigchilds(void)
{
- while(1) {
- int pid = waitpid(-1, NULL, WNOHANG);
- if ((pid == -1) || (pid == 0))
- break;
- udev_done(pid);
- }
-}
-
-/* just read everything from the pipe and clear the flag,
- * the flags was set in the signal handler
- */
-static void user_sighandler(void)
-{
- int sig;
+ pid_t pid;
+ int status;
- while(1) {
- int rc = read(pipefds[0], &sig, sizeof(sig));
- if (rc < 0)
+ while (1) {
+ pid = waitpid(-1, &status, WNOHANG);
+ if (pid <= 0)
break;
-
- sig_flag = 0;
+ if (WIFEXITED(status))
+ status = WEXITSTATUS(status);
+ else if (WIFSIGNALED(status))
+ status = WTERMSIG(status) + 128;
+ else
+ status = 0;
+ udev_done(pid, status);
}
}
-static int init_udevsend_socket(void)
+static int init_udevd_socket(void)
{
struct sockaddr_un saddr;
socklen_t addrlen;
memset(&saddr, 0x00, sizeof(saddr));
saddr.sun_family = AF_LOCAL;
/* use abstract namespace for socket path */
- strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
+ strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
- udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (udevsendsock == -1) {
- err("error getting socket, %s", strerror(errno));
+ udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (udevd_sock == -1) {
+ err("error getting socket: %s", strerror(errno));
return -1;
}
/* the bind takes care of ensuring only one copy running */
- retval = bind(udevsendsock, (struct sockaddr *) &saddr, addrlen);
+ retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
if (retval < 0) {
- err("bind failed, %s", strerror(errno));
- close(udevsendsock);
+ err("bind failed: %s", strerror(errno));
+ close(udevd_sock);
+ udevd_sock = -1;
return -1;
}
/* enable receiving of the sender credentials */
- setsockopt(udevsendsock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
+ setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
return 0;
}
+static int init_uevent_netlink_sock(void)
+{
+ struct sockaddr_nl snl;
+ const int buffersize = 16 * 1024 * 1024;
+ int retval;
+
+ memset(&snl, 0x00, sizeof(struct sockaddr_nl));
+ snl.nl_family = AF_NETLINK;
+ snl.nl_pid = getpid();
+ snl.nl_groups = 1;
+
+ uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if (uevent_netlink_sock == -1) {
+ err("error getting socket: %s", strerror(errno));
+ return -1;
+ }
+
+ /* set receive buffersize */
+ setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
+
+ retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
+ if (retval < 0) {
+ err("bind failed: %s", strerror(errno));
+ close(uevent_netlink_sock);
+ uevent_netlink_sock = -1;
+ return -1;
+ }
+ return 0;
+}
+
+static void export_initial_seqnum(void)
+{
+ char filename[PATH_SIZE];
+ int fd;
+ char seqnum[32];
+ ssize_t len = 0;
+
+ strlcpy(filename, sysfs_path, sizeof(filename));
+ strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
+ fd = open(filename, O_RDONLY);
+ if (fd >= 0) {
+ len = read(fd, seqnum, sizeof(seqnum)-1);
+ close(fd);
+ }
+ if (len <= 0) {
+ strcpy(seqnum, "0\n");
+ len = 3;
+ }
+ strlcpy(filename, udev_root, sizeof(filename));
+ strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
+ create_path(filename);
+ fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
+ if (fd >= 0) {
+ write(fd, seqnum, len);
+ close(fd);
+ }
+}
+
int main(int argc, char *argv[], char *envp[])
{
- struct sysinfo info;
- int maxsockplus;
int retval;
int fd;
struct sigaction act;
fd_set readfds;
- const char *udevd_expected_seqnum;
+ const char *value;
+ int daemonize = 0;
+ int option;
+ static const struct option options[] = {
+ { "daemon", 0, NULL, 'd' },
+ { "verbose", 0, NULL, 'v' },
+ { "help", 0, NULL, 'h' },
+ {}
+ };
+ int rc = 1;
+ int maxfd;
logging_init("udevd");
- udev_init_config();
+ udev_config_init();
+ selinux_init();
dbg("version %s", UDEV_VERSION);
+ /* parse commandline options */
+ while (1) {
+ option = getopt_long(argc, argv, "dtvh", options, NULL);
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 'd':
+ daemonize = 1;
+ break;
+ case 'v':
+ verbose = 1;
+ if (udev_log_priority < LOG_INFO)
+ udev_log_priority = LOG_INFO;
+ break;
+ case 'h':
+ printf("Usage: udevd [--help] [--daemon] [--verbose]\n");
+ goto exit;
+ default:
+ goto exit;
+ }
+ }
+
if (getuid() != 0) {
- err("need to be root, exit");
+ fprintf(stderr, "root privileges required\n");
+ err("root privileges required");
+ goto exit;
+ }
+
+ /* init sockets to receive events */
+ if (init_udevd_socket() < 0) {
+ if (errno == EADDRINUSE) {
+ fprintf(stderr, "another udev daemon already running\n");
+ err("another udev daemon already running");
+ rc = 1;
+ } else {
+ fprintf(stderr, "error initializing udevd socket\n");
+ err("error initializing udevd socket");
+ rc = 2;
+ }
+ goto exit;
+ }
+
+ if (init_uevent_netlink_sock() < 0) {
+ fprintf(stderr, "error initializing netlink socket\n");
+ err("error initializing netlink socket");
+ rc = 3;
goto exit;
}
- /* daemonize on request */
- if (argc == 2 && strcmp(argv[1], "-d") == 0) {
+ /* parse the rules and keep them in memory */
+ sysfs_init();
+ udev_rules_init(&rules, 1);
+
+ export_initial_seqnum();
+
+ if (daemonize) {
pid_t pid;
pid = fork();
switch (pid) {
case 0:
- dbg("damonized fork running");
+ dbg("daemonized fork running");
break;
case -1:
- err("fork of daemon failed");
+ err("fork of daemon failed: %s", strerror(errno));
+ rc = 4;
goto exit;
default:
- logging_close();
- exit(0);
+ dbg("child [%u] running, parent exits", pid);
+ rc = 0;
+ goto exit;
}
}
- /* become session leader */
- sid = setsid();
- dbg("our session is %d", sid);
+ /* redirect std fd's */
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ dup2(fd, STDIN_FILENO);
+ if (!verbose)
+ dup2(fd, STDOUT_FILENO);
+ dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ close(fd);
+ } else
+ err("error opening /dev/null: %s", strerror(errno));
+
+ /* set scheduling priority for the daemon */
+ setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
- /* make sure we don't lock any path */
chdir("/");
- umask(umask(077) | 022);
+ umask(022);
- /*set a reasonable scheduling priority for the daemon */
- setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
+ /* become session leader */
+ sid = setsid();
+ dbg("our session is %d", sid);
- /* Set fds to dev/null */
- fd = open( "/dev/null", O_RDWR );
- if (fd >= 0) {
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- if (fd > 2)
- close(fd);
- } else
- err("error opening /dev/null %s", strerror(errno));
+ /* OOM_DISABLE == -17 */
+ fd = open("/proc/self/oom_adj", O_RDWR);
+ if (fd < 0)
+ err("error disabling OOM: %s", strerror(errno));
+ else {
+ write(fd, "-17", 3);
+ close(fd);
+ }
/* setup signal handler pipe */
- retval = pipe(pipefds);
+ retval = pipe(signal_pipe);
if (retval < 0) {
err("error getting pipes: %s", strerror(errno));
goto exit;
}
- retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK);
+ retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
if (retval < 0) {
err("error fcntl on read pipe: %s", strerror(errno));
goto exit;
}
- retval = fcntl(pipefds[0], F_SETFD, FD_CLOEXEC);
- if (retval < 0)
+ retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
+ if (retval < 0) {
err("error fcntl on read pipe: %s", strerror(errno));
+ goto exit;
+ }
- retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
+ retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
if (retval < 0) {
err("error fcntl on write pipe: %s", strerror(errno));
goto exit;
}
- retval = fcntl(pipefds[1], F_SETFD, FD_CLOEXEC);
- if (retval < 0)
+ retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
+ if (retval < 0) {
err("error fcntl on write pipe: %s", strerror(errno));
+ goto exit;
+ }
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
- sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
-
- if (init_udevsend_socket() < 0) {
- if (errno == EADDRINUSE)
- dbg("another udevd running, exit");
+ sigaction(SIGHUP, &act, NULL);
+
+ /* watch rules directory */
+ inotify_fd = inotify_init();
+ if (inotify_fd >= 0)
+ inotify_add_watch(inotify_fd, udev_rules_filename, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+ else if (errno == ENOSYS)
+ err("the kernel does not support inotify, udevd can't monitor configuration file changes");
+ else
+ err("inotify_init failed: %s", strerror(errno));
+
+ /* maximum limit of forked childs */
+ value = getenv("UDEVD_MAX_CHILDS");
+ if (value)
+ max_childs = strtoul(value, NULL, 10);
+ else {
+ int memsize = mem_size_mb();
+ if (memsize > 0)
+ max_childs = 128 + (memsize / 4);
else
- dbg("error initialising udevsend socket: %s", strerror(errno));
-
- goto exit;
+ max_childs = UDEVD_MAX_CHILDS;
+ }
+ info("initialize max_childs to %u", max_childs);
+
+ /* start to throttle forking if maximum number of _running_ childs is reached */
+ value = getenv("UDEVD_MAX_CHILDS_RUNNING");
+ if (value)
+ max_childs_running = strtoull(value, NULL, 10);
+ else {
+ int cpus = cpu_count();
+ if (cpus > 0)
+ max_childs_running = 8 + (8 * cpus);
+ else
+ max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
}
+ info("initialize max_childs_running to %u", max_childs_running);
- /* possible override of udev binary, used for testing */
- udev_bin = getenv("UDEV_BIN");
- if (udev_bin != NULL)
- info("udev binary is set to '%s'", udev_bin);
- else
- udev_bin = UDEV_BIN;
+ /* clear environment for forked event processes */
+ clearenv();
- /* possible init of expected_seqnum value */
- udevd_expected_seqnum = getenv("UDEVD_EXPECTED_SEQNUM");
- if (udevd_expected_seqnum != NULL) {
- expected_seqnum = strtoull(udevd_expected_seqnum, NULL, 10);
- info("initialize expected_seqnum to %llu", expected_seqnum);
- }
+ /* export log_priority , as called programs may want to follow that setting */
+ sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
+ putenv(udev_log);
- /* get current time to provide shorter timeout on startup */
- sysinfo(&info);
- startup_time = info.uptime;
+ maxfd = udevd_sock;
+ maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
+ maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
+ maxfd = UDEV_MAX(maxfd, inotify_fd);
- FD_ZERO(&readfds);
- FD_SET(udevsendsock, &readfds);
- FD_SET(pipefds[0], &readfds);
- maxsockplus = udevsendsock+1;
- while (1) {
- struct hotplug_msg *msg;
+ while (!udev_exit) {
+ struct udevd_uevent_msg *msg;
+ int fdcount;
- fd_set workreadfds = readfds;
- retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
+ FD_ZERO(&readfds);
+ FD_SET(signal_pipe[READ_END], &readfds);
+ FD_SET(udevd_sock, &readfds);
+ FD_SET(uevent_netlink_sock, &readfds);
+ if (inotify_fd >= 0)
+ FD_SET(inotify_fd, &readfds);
- if (retval < 0) {
+ fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
+ if (fdcount < 0) {
if (errno != EINTR)
- dbg("error in select: %s", strerror(errno));
+ err("error in select: %s", strerror(errno));
continue;
}
- if (FD_ISSET(udevsendsock, &workreadfds)) {
- msg = get_udevsend_msg();
+ /* get control message */
+ if (FD_ISSET(udevd_sock, &readfds))
+ get_ctrl_msg();
+
+ /* get netlink message */
+ if (FD_ISSET(uevent_netlink_sock, &readfds)) {
+ msg = get_netlink_msg();
if (msg)
msg_queue_insert(msg);
}
- if (FD_ISSET(pipefds[0], &workreadfds))
- user_sighandler();
+ /* received a signal, clear our notification pipe */
+ if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
+ char buf[256];
+
+ read(signal_pipe[READ_END], &buf, sizeof(buf));
+ }
+
+ /* rules directory inotify watch */
+ if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
+ int nbytes;
+
+ /* discard all possible events, we can just reload the config */
+ if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes) {
+ char *buf;
+
+ reload_config = 1;
+ buf = malloc(nbytes);
+ if (!buf) {
+ err("error getting buffer for inotify, disable watching");
+ close(inotify_fd);
+ inotify_fd = -1;
+ }
+ read(inotify_fd, buf, nbytes);
+ free(buf);
+ }
+ }
+
+ /* rules changed, set by inotify or a HUP signal */
+ if (reload_config) {
+ reload_config = 0;
+ udev_rules_cleanup(&rules);
+ udev_rules_init(&rules, 1);
+ }
+ /* forked child has returned */
if (sigchilds_waiting) {
sigchilds_waiting = 0;
reap_sigchilds();
}
- if (run_msg_q) {
- run_msg_q = 0;
- msg_queue_manager();
- }
-
if (run_exec_q) {
- /* clean up running_list before calling exec_queue_manager() */
- if (sigchilds_waiting) {
- sigchilds_waiting = 0;
- reap_sigchilds();
- }
-
run_exec_q = 0;
- exec_queue_manager();
+ if (!stop_exec_q)
+ msg_queue_manager();
}
}
+ rc = 0;
exit:
+ udev_rules_cleanup(&rules);
+ sysfs_cleanup();
+
+ if (signal_pipe[READ_END] >= 0)
+ close(signal_pipe[READ_END]);
+ if (signal_pipe[WRITE_END] >= 0)
+ close(signal_pipe[WRITE_END]);
+
+ if (udevd_sock >= 0)
+ close(udevd_sock);
+ if (inotify_fd >= 0)
+ close(inotify_fd);
+ if (uevent_netlink_sock >= 0)
+ close(uevent_netlink_sock);
+
logging_close();
- return 1;
+
+ return rc;
}
~ianmdlvl / elogind.git / blobdiff