#include <sys/un.h>
#include <sys/sysinfo.h>
#include <sys/stat.h>
+#include <linux/netlink.h>
#include "list.h"
#include "udev_libc_wrapper.h"
/* global variables*/
static int udevsendsock;
+static int ueventsock;
static pid_t sid;
static int pipefds[2];
char *udev_bin;
#ifdef USE_LOG
-void log_message (int level, const char *format, ...)
+void log_message (int priority, const char *format, ...)
{
- va_list args;
+ va_list args;
+
+ if (priority > udev_log_priority)
+ return;
va_start(args, format);
- vsyslog(level, format, args);
+ vsyslog(priority, format, args);
va_end(args);
}
#endif
-#define msg_dump(msg) \
- dbg("msg_dump: sequence %llu, '%s', '%s', '%s'", \
- msg->seqnum, msg->action, msg->devpath, msg->subsystem);
-
static void msg_dump_queue(void)
{
#ifdef DEBUG
return;
}
+ /* 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)
if (loop_msg->seqnum == msg->seqnum) {
dbg("ignoring duplicate message seq %llu", msg->seqnum);
+ free(msg);
return;
}
}
}
/* forks event and removes event from run queue when finished */
-static void udev_run(struct hotplug_msg *msg)
+static void execute_udev(struct hotplug_msg *msg)
{
char *const argv[] = { "udev", msg->subsystem, NULL };
pid_t pid;
switch (pid) {
case 0:
/* child */
+ if (ueventsock != -1)
+ close(ueventsock);
close(udevsendsock);
logging_close();
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
execve(udev_bin, argv, msg->envp);
- dbg("exec of child failed");
+ err("exec of child failed");
_exit(1);
break;
case -1:
- dbg("fork of child failed");
+ err("fork of child failed");
run_queue_delete(msg);
break;
default:
if (msg->devpath == NULL)
return NULL;
+ /* skip any events with a timeout set */
+ if (msg->timeout)
+ return NULL;
+
list_for_each_entry(loop_msg, &running_list, node) {
if (loop_msg->devpath == NULL)
continue;
if (!msg) {
/* move event to run list */
list_move_tail(&loop_msg->node, &running_list);
- udev_run(loop_msg);
+ execute_udev(loop_msg);
running++;
dbg("moved seq %llu to running list", loop_msg->seqnum);
} else {
}
}
+static struct hotplug_msg *get_msg_from_envbuf(const char *buf, int buf_size)
+{
+ int bufpos;
+ int i;
+ struct hotplug_msg *msg;
+
+ msg = malloc(sizeof(struct hotplug_msg) + buf_size);
+ if (msg == NULL)
+ return NULL;
+ memset(msg, 0x00, sizeof(struct hotplug_msg) + buf_size);
+
+ /* copy environment buffer and reconstruct envp */
+ memcpy(msg->envbuf, buf, buf_size);
+ bufpos = 0;
+ for (i = 0; (bufpos < buf_size) && (i < HOTPLUG_NUM_ENVP-2); i++) {
+ int keylen;
+ char *key;
+
+ 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];
+
+ if (strncmp(key, "DEVPATH=", 8) == 0)
+ msg->devpath = &key[8];
+
+ if (strncmp(key, "SUBSYSTEM=", 10) == 0)
+ msg->subsystem = &key[10];
+
+ if (strncmp(key, "SEQNUM=", 7) == 0)
+ msg->seqnum = strtoull(&key[7], NULL, 10);
+
+ if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
+ msg->physdevpath = &key[12];
+
+ if (strncmp(key, "TIMEOUT=", 8) == 0)
+ msg->timeout = strtoull(&key[8], NULL, 10);
+ }
+ msg->envp[i++] = "UDEVD_EVENT=1";
+ msg->envp[i] = NULL;
+
+ return msg;
+}
+
/* receive the udevsend message and do some sanity checks */
static struct hotplug_msg *get_udevsend_msg(void)
{
static struct udevsend_msg usend_msg;
struct hotplug_msg *msg;
- int bufpos;
- int i;
ssize_t size;
struct msghdr smsg;
struct cmsghdr *cmsg;
cred = (struct ucred *) CMSG_DATA(cmsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- dbg("no sender credentials received, message ignored");
+ info("no sender credentials received, message ignored");
return NULL;
}
if (cred->uid != 0) {
- dbg("sender uid=%i, message ignored", cred->uid);
+ info("sender uid=%i, message ignored", cred->uid);
return NULL;
}
if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
- dbg("message magic '%s' doesn't match, ignore it", usend_msg.magic);
+ info("message magic '%s' doesn't match, ignore it", usend_msg.magic);
return NULL;
}
envbuf_size = size - offsetof(struct udevsend_msg, envbuf);
dbg("envbuf_size=%i", envbuf_size);
- msg = malloc(sizeof(struct hotplug_msg) + envbuf_size);
+ msg = get_msg_from_envbuf(usend_msg.envbuf, envbuf_size);
if (msg == NULL)
return NULL;
- memset(msg, 0x00, sizeof(struct hotplug_msg) + envbuf_size);
+ return msg;
+}
- /* 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;
+/* receive the kernel user event message and do some sanity checks */
+static struct hotplug_msg *get_uevent_msg(void)
+{
+ struct hotplug_msg *msg;
+ int bufpos;
+ ssize_t size;
+ static char buffer[HOTPLUG_BUFFER_SIZE + 512];
+ char *pos;
- 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);
+ size = recv(ueventsock, &buffer, sizeof(buffer), 0);
+ if (size < 0) {
+ if (errno != EINTR)
+ dbg("unable to receive udevsend message");
+ return NULL;
+ }
- /* remember some keys for further processing */
- if (strncmp(key, "ACTION=", 7) == 0)
- msg->action = &key[7];
+ if ((size_t)size > sizeof(buffer)-1)
+ size = sizeof(buffer)-1;
+ buffer[size] = '\0';
+ dbg("uevent_size=%i", size);
- if (strncmp(key, "DEVPATH=", 8) == 0)
- msg->devpath = &key[8];
+ /* 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, "SUBSYSTEM=", 10) == 0)
- msg->subsystem = &key[10];
+ /* validate message */
+ pos = strchr(buffer, '@');
+ if (pos == NULL) {
+ dbg("invalid uevent '%s'", buffer);
+ free(msg);
+ return NULL;
+ }
+ pos[0] = '\0';
- if (strncmp(key, "SEQNUM=", 7) == 0)
- msg->seqnum = strtoull(&key[7], NULL, 10);
+ if (msg->action == NULL) {
+ dbg("no ACTION in payload found, skip event '%s'", buffer);
+ free(msg);
+ return NULL;
+ }
- if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
- msg->physdevpath = &key[12];
+ if (strcmp(msg->action, buffer) != 0) {
+ dbg("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;
}
udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (udevsendsock == -1) {
- dbg("error getting socket, %s", strerror(errno));
+ 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);
if (retval < 0) {
- dbg("bind failed, %s", strerror(errno));
+ err("bind failed, %s", strerror(errno));
close(udevsendsock);
return -1;
}
return 0;
}
+static int init_uevent_socket(void)
+{
+ struct sockaddr_nl snl;
+ int retval;
+
+ memset(&snl, 0x00, sizeof(struct sockaddr_nl));
+ snl.nl_family = AF_NETLINK;
+ snl.nl_pid = getpid();
+ snl.nl_groups = 0xffffffff;
+
+ ueventsock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if (ueventsock == -1) {
+ dbg("error getting socket, %s", strerror(errno));
+ return -1;
+ }
+
+ retval = bind(ueventsock, (struct sockaddr *) &snl,
+ sizeof(struct sockaddr_nl));
+ if (retval < 0) {
+ dbg("bind failed, %s", strerror(errno));
+ close(ueventsock);
+ ueventsock = -1;
+ return -1;
+ }
+
+ return 0;
+}
+
int main(int argc, char *argv[], char *envp[])
{
struct sysinfo info;
struct sigaction act;
fd_set readfds;
const char *udevd_expected_seqnum;
+ int uevent_active = 0;
logging_init("udevd");
+ udev_init_config();
dbg("version %s", UDEV_VERSION);
if (getuid() != 0) {
- dbg("need to be root, exit");
+ err("need to be root, exit");
goto exit;
}
dbg("damonized fork running");
break;
case -1:
- dbg("fork of daemon failed");
+ err("fork of daemon failed");
goto exit;
default:
logging_close();
if (fd > 2)
close(fd);
} else
- dbg("error opening /dev/null %s", strerror(errno));
+ err("error opening /dev/null %s", strerror(errno));
/* setup signal handler pipe */
retval = pipe(pipefds);
if (retval < 0) {
- dbg("error getting pipes: %s", strerror(errno));
+ err("error getting pipes: %s", strerror(errno));
goto exit;
}
retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK);
if (retval < 0) {
- dbg("error fcntl on read pipe: %s", strerror(errno));
+ err("error fcntl on read pipe: %s", strerror(errno));
goto exit;
}
retval = fcntl(pipefds[0], F_SETFD, FD_CLOEXEC);
if (retval < 0)
- dbg("error fcntl on read pipe: %s", strerror(errno));
+ err("error fcntl on read pipe: %s", strerror(errno));
retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
if (retval < 0) {
- dbg("error fcntl on write pipe: %s", strerror(errno));
+ err("error fcntl on write pipe: %s", strerror(errno));
goto exit;
}
retval = fcntl(pipefds[1], F_SETFD, FD_CLOEXEC);
if (retval < 0)
- dbg("error fcntl on write pipe: %s", strerror(errno));
+ err("error fcntl on write pipe: %s", strerror(errno));
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
- act.sa_handler = (void (*) (int))sig_handler;
+ act.sa_handler = (void (*)(int)) sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
+ if (init_uevent_socket() < 0) {
+ dbg("uevent socket not available");
+ }
+
if (init_udevsend_socket() < 0) {
if (errno == EADDRINUSE)
dbg("another udevd running, exit");
/* possible override of udev binary, used for testing */
udev_bin = getenv("UDEV_BIN");
if (udev_bin != NULL)
- dbg("udev binary is set to '%s'", udev_bin);
+ info("udev binary is set to '%s'", udev_bin);
else
udev_bin = UDEV_BIN;
udevd_expected_seqnum = getenv("UDEVD_EXPECTED_SEQNUM");
if (udevd_expected_seqnum != NULL) {
expected_seqnum = strtoull(udevd_expected_seqnum, NULL, 10);
- dbg("initialize expected_seqnum to %llu", expected_seqnum);
+ info("initialize expected_seqnum to %llu", expected_seqnum);
}
/* get current time to provide shorter timeout on startup */
FD_ZERO(&readfds);
FD_SET(udevsendsock, &readfds);
+ if (ueventsock != -1)
+ FD_SET(ueventsock, &readfds);
FD_SET(pipefds[0], &readfds);
maxsockplus = udevsendsock+1;
while (1) {
if (FD_ISSET(udevsendsock, &workreadfds)) {
msg = get_udevsend_msg();
- if (msg)
+ if (msg) {
+ /* discard kernel messages if netlink is active */
+ if (uevent_active && msg->seqnum != 0) {
+ dbg("skip kernel udevsend message, netlink is active");
+ free(msg);
+ continue;
+ }
msg_queue_insert(msg);
+ }
+ }
+
+ if (FD_ISSET(ueventsock, &workreadfds)) {
+ msg = get_uevent_msg();
+ if (msg) {
+ msg_queue_insert(msg);
+ /* disable udevsend with first netlink message */
+ if (!uevent_active) {
+ info("netlink message received, disable kernel udevsend messages");
+ uevent_active = 1;
+ }
+ }
}
if (FD_ISSET(pipefds[0], &workreadfds))
~ianmdlvl / elogind.git / blobdiff