/*
- * udevd.c - hotplug event serializer
+ * udevd.c - event listener and serializer
*
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
+#include <syslog.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <sys/time.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 "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_version.h"
+#include "udev_rules.h"
#include "udev_utils.h"
#include "udevd.h"
#include "logging.h"
-#ifndef NETLINK_KOBJECT_UEVENT
-#define NETLINK_KOBJECT_UEVENT 15
-#endif
-
/* global variables*/
+struct udev_rules rules;
static int udevd_sock;
static int uevent_netlink_sock;
+static int inotify_fd;
static pid_t sid;
-static int pipefds[2];
+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 init_phase = 1;
static int run_exec_q;
static int stop_exec_q;
+static int event_timeout;
+static int max_childs;
+static int max_childs_running;
+static unsigned long long expected_seqnum;
+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);
-
-static char *udev_bin;
-static unsigned long long expected_seqnum;
-static int event_timeout;
-static int max_childs;
-static int max_childs_running;
-
#ifdef USE_LOG
-void log_message (int priority, const char *format, ...)
+void log_message(int priority, const char *format, ...)
{
va_list args;
if (msg->seqnum == 0) {
dbg("no SEQNUM, move straight to the exec queue");
- list_add(&msg->node, &exec_list);
+ list_add_tail(&msg->node, &exec_list);
run_exec_q = 1;
return;
}
init_phase = 0;
}
- /* 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;
- return;
- }
-
/* sort message by sequence number into list */
list_for_each_entry_reverse(loop_msg, &msg_list, node) {
if (loop_msg->seqnum < msg->seqnum)
}
}
list_add(&msg->node, &loop_msg->node);
- info("seq %llu queued, devpath '%s'", msg->seqnum, msg->devpath);
+ info("seq %llu queued, '%s' '%s'", msg->seqnum, msg->action, msg->devpath);
/* run msg queue manager */
run_msg_q = 1;
return;
}
-/* forks event and removes event from run queue when finished */
-static void udev_event_fork(struct uevent_msg *msg)
+static void asmlinkage udev_event_sig_handler(int signum)
+{
+ if (signum == SIGALRM)
+ exit(1);
+}
+
+static int udev_event_process(struct uevent_msg *msg)
+{
+ struct sigaction act;
+ struct udevice udev;
+ struct name_entry *name_loop;
+ int i;
+ int retval;
+
+ /* 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);
+
+ /* trigger timeout to prevent hanging processes */
+ alarm(UDEV_ALARM_TIMEOUT);
+
+ /* reconstruct env from message */
+ for (i = 0; msg->envp[i]; i++)
+ putenv(msg->envp[i]);
+
+ udev_init_device(&udev, msg->devpath, msg->subsystem, msg->action);
+ retval = udev_process_event(&rules, &udev);
+
+ /* run programs collected by RUN-key*/
+ if (!retval) {
+ 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:")], msg->devpath, msg->action);
+ else
+ run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
+ }
+ }
+
+ udev_cleanup_device(&udev);
+
+ return 0;
+}
+
+/* runs event and removes event from run queue when finished */
+static void udev_event_run(struct uevent_msg *msg)
{
- char *const argv[] = { "udev", msg->subsystem, NULL };
pid_t pid;
struct sysinfo info;
switch (pid) {
case 0:
/* child */
- if (uevent_netlink_sock != -1)
- close(uevent_netlink_sock);
+ 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);
+ udev_event_process(msg);
+ info("seq %llu finished", msg->seqnum);
+
+ logging_close();
+ exit(0);
case -1:
err("fork of child failed");
msg_queue_delete(msg);
default:
/* get SIGCHLD in main loop */
sysinfo(&info);
- info("seq %llu forked, pid %d, %ld seconds old",
- msg->seqnum, pid, info.uptime - msg->queue_time);
+ info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old",
+ msg->seqnum, pid, msg->action, msg->subsystem, info.uptime - msg->queue_time);
msg->pid = pid;
}
}
if (f == -1)
return -1;
- len = read(f, buf, sizeof(buf));
+ len = read(f, buf, sizeof(buf)-1);
close(f);
if (len <= 0)
if (f == -1)
continue;
- len = read(f, line, sizeof(line));
+ len = read(f, line, sizeof(line)-1);
close(f);
if (len <= 0)
if (running_with_devpath(loop_msg, max_childs) == 0) {
/* move event to run list */
list_move_tail(&loop_msg->node, &running_list);
- udev_event_fork(loop_msg);
+ udev_event_run(loop_msg);
running++;
dbg("moved seq %llu to running list", loop_msg->seqnum);
} else
/* limit timeout during initialization phase */
if (init_phase) {
- timeout = UDEVD_INIT_EVENT_TIMEOUT;
- dbg("initialization phase, limit timeout to %i seconds", UDEVD_INIT_EVENT_TIMEOUT);
+ if (timeout > UDEVD_INIT_EVENT_TIMEOUT)
+ timeout = UDEVD_INIT_EVENT_TIMEOUT;
+ dbg("initialization phase, timeout %i seconds", timeout);
}
/* move event with expired timeout to the exec list */
if (msg_age >= timeout) {
msg_move_exec(loop_msg);
goto recheck;
- } else {
+ } else
break;
- }
}
msg_dump_queue();
/* set timeout for remaining queued events */
- if (list_empty(&msg_list) == 0) {
+ if (!list_empty(&msg_list)) {
struct itimerval itv = {{0, 0}, {timeout - msg_age, 0}};
- dbg("next event expires in %li seconds", timeout - msg_age);
+ info("next event expires in %li seconds", timeout - msg_age);
setitimer(ITIMER_REAL, &itv, NULL);
}
}
size = recvmsg(udevd_sock, &smsg, 0);
if (size < 0) {
if (errno != EINTR)
- dbg("unable to receive udevd message");
+ err("unable to receive udevd message");
return NULL;
}
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");
+ err("no sender credentials received, message ignored");
return NULL;
}
if (cred->uid != 0) {
- info("sender uid=%i, message ignored", cred->uid);
+ err("sender uid=%i, message ignored", cred->uid);
return NULL;
}
if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
- info("message magic '%s' doesn't match, ignore it", usend_msg.magic);
+ err("message magic '%s' doesn't match, ignore it", usend_msg.magic);
return NULL;
}
intval = (int *) usend_msg.envbuf;
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_SET_MAX_CHILDS:
intval = (int *) usend_msg.envbuf;
info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval);
max_childs = *intval;
break;
+ case UDEVD_RELOAD_RULES:
+ info("udevd message (RELOAD_RULES) received");
+ reload_config = 1;
+ break;
default:
dbg("unknown message type");
}
size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
if (size < 0) {
if (errno != EINTR)
- dbg("unable to receive udevd message");
+ err("unable to receive udevd message");
return NULL;
}
/* validate message */
pos = strchr(buffer, '@');
if (pos == NULL) {
- dbg("invalid uevent '%s'", buffer);
+ err("invalid uevent '%s'", buffer);
free(msg);
return NULL;
}
pos[0] = '\0';
if (msg->action == NULL) {
- dbg("no ACTION in payload found, skip event '%s'", buffer);
+ info("no ACTION in payload found, skip event '%s'", buffer);
free(msg);
return NULL;
}
if (strcmp(msg->action, buffer) != 0) {
- dbg("ACTION in payload does not match uevent, skip event '%s'", buffer);
+ err("ACTION in payload does not match uevent, skip event '%s'", buffer);
free(msg);
return NULL;
}
static void asmlinkage sig_handler(int signum)
{
- int rc;
-
switch (signum) {
case SIGINT:
case SIGTERM:
- exit(20 + signum);
+ udev_exit = 1;
break;
case SIGALRM:
/* set flag, then write to pipe if needed */
run_msg_q = 1;
- goto do_write;
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)
list_for_each_entry(msg, &running_list, node) {
if (msg->pid == pid) {
sysinfo(&info);
- info("seq %llu exit, %ld seconds old", msg->seqnum, info.uptime - msg->queue_time);
+ if (msg->queue_time)
+ info("seq %llu, pid [%d] exit, %ld seconds old", msg->seqnum, msg->pid, info.uptime - msg->queue_time);
+ else
+ info("seq 0, pid [%d] exit", msg->pid);
msg_queue_delete(msg);
/* we want to run the exec queue manager since there may
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;
- while(1) {
- int rc = read(pipefds[0], &sig, sizeof(sig));
- if (rc < 0)
+ while (1) {
+ pid = waitpid(-1, NULL, WNOHANG);
+ if (pid <= 0)
break;
-
- sig_flag = 0;
+ udev_done(pid);
}
}
static int init_udevd_socket(void)
{
struct sockaddr_un saddr;
- const int buffersize = 1024 * 1024;
+ const int buffersize = 16 * 1024 * 1024;
socklen_t addrlen;
const int feature_on = 1;
int retval;
}
/* set receive buffersize */
- setsockopt(udevd_sock, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize));
+ setsockopt(udevd_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
/* the bind takes care of ensuring only one copy running */
retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
if (retval < 0) {
err("bind failed, %s", strerror(errno));
- close(udevd_sock);
return -1;
}
static int init_uevent_netlink_sock(void)
{
struct sockaddr_nl snl;
- const int buffersize = 1024 * 1024;
+ const int buffersize = 16 * 1024 * 1024;
int retval;
memset(&snl, 0x00, sizeof(struct sockaddr_nl));
uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (uevent_netlink_sock == -1) {
- dbg("error getting socket, %s", strerror(errno));
+ err("error getting socket, %s", strerror(errno));
return -1;
}
/* set receive buffersize */
- setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize));
+ setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
- retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
- sizeof(struct sockaddr_nl));
+ retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
if (retval < 0) {
- dbg("bind failed, %s", strerror(errno));
+ err("bind failed, %s", strerror(errno));
close(uevent_netlink_sock);
uevent_netlink_sock = -1;
return -1;
}
-
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
- int maxsockplus;
int retval;
int fd;
struct sigaction act;
int uevent_netlink_active = 0;
int daemonize = 0;
int i;
+ int rc = 0;
+
+ /* redirect std fd's, if the kernel forks us, we don't have them at all */
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ if (fd != STDIN_FILENO)
+ dup2(fd, STDIN_FILENO);
+ if (fd != STDOUT_FILENO)
+ dup2(fd, STDOUT_FILENO);
+ if (fd != STDERR_FILENO)
+ dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ close(fd);
+ }
logging_init("udevd");
+ if (fd < 0)
+ err("fatal, could not open /dev/null");
+
udev_init_config();
dbg("version %s", UDEV_VERSION);
goto exit;
}
+ /* parse commandline options */
for (i = 1 ; i < argc; i++) {
char *arg = argv[i];
if (strcmp(arg, "--daemon") == 0 || strcmp(arg, "-d") == 0) {
stop_exec_q = 1;
}
}
+
+ /* init sockets to receive events */
+ if (init_udevd_socket() < 0) {
+ if (errno == EADDRINUSE) {
+ dbg("another udevd running, exit");
+ rc = 1;
+ } else {
+ dbg("error initializing udevd socket: %s", strerror(errno));
+ rc = 2;
+ }
+ goto exit;
+ }
+
+ if (init_uevent_netlink_sock() < 0) {
+ err("uevent socket not available");
+ rc = 3;
+ goto exit;
+ }
+
+ /* parse the rules and keep it in memory */
+ udev_rules_init(&rules, 1);
+
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");
+ rc = 4;
goto exit;
default:
- logging_close();
- exit(0);
+ dbg("child [%u] running, parent exits", pid);
+ goto exit;
}
}
- /* become session leader */
- sid = setsid();
- dbg("our session is %d", sid);
+ /* set scheduling priority for the daemon */
+ setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
chdir("/");
- umask(umask(077) | 022);
+ umask(077);
- /*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");
+ 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_SETFL, O_NONBLOCK);
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)
- err("error fcntl on read pipe: %s", strerror(errno));
-
- retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
+ retval = fcntl(signal_pipe[WRITE_END], F_SETFL, O_NONBLOCK);
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)
- err("error fcntl on write pipe: %s", strerror(errno));
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
sigaction(SIGTERM, &act, NULL);
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
+ sigaction(SIGHUP, &act, NULL);
- if (init_uevent_netlink_sock() < 0) {
- dbg("uevent socket not available");
- }
-
- if (init_udevd_socket() < 0) {
- if (errno == EADDRINUSE)
- dbg("another udevd running, exit");
- else
- dbg("error initialising udevd socket: %s", strerror(errno));
-
- goto exit;
- }
-
- /* override of forked 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;
+ /* 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);
/* init of expected_seqnum value */
value = getenv("UDEVD_EXPECTED_SEQNUM");
max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
info("initialize max_childs_running to %u", max_childs_running);
- FD_ZERO(&readfds);
- FD_SET(udevd_sock, &readfds);
- if (uevent_netlink_sock != -1)
- FD_SET(uevent_netlink_sock, &readfds);
- FD_SET(pipefds[0], &readfds);
- maxsockplus = udevd_sock+1;
- while (1) {
+ /* clear environment for forked event processes */
+ clearenv();
+
+ /* export log_priority , as called programs may want to follow that setting */
+ sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
+ putenv(udev_log);
+
+ while (!udev_exit) {
struct 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(UDEV_MAX(uevent_netlink_sock, inotify_fd)+1, &readfds, NULL, NULL, NULL);
+ if (fdcount < 0) {
if (errno != EINTR)
dbg("error in select: %s", strerror(errno));
continue;
}
- if (FD_ISSET(udevd_sock, &workreadfds)) {
+ /* get user socket message */
+ if (FD_ISSET(udevd_sock, &readfds)) {
msg = get_udevd_msg();
if (msg) {
/* discard kernel messages if netlink is active */
if (uevent_netlink_active && msg->type == UDEVD_UEVENT_UDEVSEND && msg->seqnum != 0) {
- dbg("skip uevent_helper message, netlink is active");
+ info("skip uevent_helper message with SEQNUM, netlink is active");
free(msg);
- continue;
- }
- msg_queue_insert(msg);
+ } else
+ msg_queue_insert(msg);
}
}
- if (FD_ISSET(uevent_netlink_sock, &workreadfds)) {
+ /* get kernel 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 signal*/
+ if (reload_config) {
+ reload_config = 0;
+ udev_rules_close(&rules);
+ udev_rules_init(&rules, 1);
+ }
+
+ /* forked child have returned */
if (sigchilds_waiting) {
sigchilds_waiting = 0;
reap_sigchilds();
}
exit:
+ udev_rules_close(&rules);
+
+ 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