#include <sys/un.h>
#include <sys/sysinfo.h>
#include <sys/stat.h>
+#include <linux/netlink.h>
#include "list.h"
#include "udev_libc_wrapper.h"
#include "logging.h"
/* global variables*/
-static int udevsendsock;
+static int udevd_sock;
+static int uevent_nl_sock;
static pid_t sid;
static int pipefds[2];
static long startup_time;
-static unsigned long long expected_seqnum = 0;
+static unsigned long long expected_seqnum;
static volatile int sigchilds_waiting;
static volatile int run_msg_q;
static volatile int sig_flag;
static int run_exec_q;
+static int stop_exec_q;
static LIST_HEAD(msg_list);
static LIST_HEAD(exec_list);
static void msg_dump_queue(void)
{
#ifdef DEBUG
- struct hotplug_msg *msg;
+ struct uevent_msg *msg;
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 run_queue_delete(struct uevent_msg *msg)
{
list_del(&msg->node);
free(msg);
}
/* orders the message in the queue by sequence number */
-static void msg_queue_insert(struct hotplug_msg *msg)
+static void msg_queue_insert(struct uevent_msg *msg)
{
- struct hotplug_msg *loop_msg;
+ struct uevent_msg *loop_msg;
struct sysinfo info;
if (msg->seqnum == 0) {
break;
if (loop_msg->seqnum == msg->seqnum) {
- info("ignoring duplicate message seq %llu", 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 uevent_msg *msg)
{
char *const argv[] = { "udev", msg->subsystem, NULL };
pid_t pid;
switch (pid) {
case 0:
/* child */
- close(udevsendsock);
+ if (uevent_nl_sock != -1)
+ close(uevent_nl_sock);
+ close(udevd_sock);
logging_close();
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
}
/* 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 struct uevent_msg *running_with_devpath(struct uevent_msg *msg)
{
- struct hotplug_msg *loop_msg;
+ struct uevent_msg *loop_msg;
if (msg->devpath == NULL)
return NULL;
/* exec queue management routine executes the events and serializes events in the same sequence */
static void exec_queue_manager(void)
{
- struct hotplug_msg *loop_msg;
- struct hotplug_msg *tmp_msg;
- struct hotplug_msg *msg;
+ struct uevent_msg *loop_msg;
+ struct uevent_msg *tmp_msg;
+ struct uevent_msg *msg;
int running;
running = running_processes();
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 void msg_move_exec(struct hotplug_msg *msg)
+static void msg_move_exec(struct uevent_msg *msg)
{
list_move_tail(&msg->node, &exec_list);
run_exec_q = 1;
/* 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 uevent_msg *loop_msg;
+ struct uevent_msg *tmp_msg;
struct sysinfo info;
long msg_age = 0;
static int timeout = EVENT_INIT_TIMEOUT_SEC;
}
}
-/* receive the udevsend message and do some sanity checks */
-static struct hotplug_msg *get_udevsend_msg(void)
+static struct uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size)
{
- static struct udevsend_msg usend_msg;
- struct hotplug_msg *msg;
int bufpos;
int i;
+ struct uevent_msg *msg;
+
+ msg = malloc(sizeof(struct uevent_msg) + buf_size);
+ if (msg == NULL)
+ return NULL;
+ memset(msg, 0x00, sizeof(struct uevent_msg) + buf_size);
+
+ /* 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;
+
+ 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 udevd message from userspace */
+static struct uevent_msg *get_udevd_msg(void)
+{
+ static struct udevd_msg usend_msg;
+ struct uevent_msg *msg;
ssize_t size;
struct msghdr smsg;
struct cmsghdr *cmsg;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
int envbuf_size;
- memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
+ memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
iov.iov_base = &usend_msg;
- iov.iov_len = sizeof(struct udevsend_msg);
+ iov.iov_len = sizeof(struct udevd_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");
+ dbg("unable to receive udevd message");
return NULL;
}
cmsg = CMSG_FIRSTHDR(&smsg);
return NULL;
}
- 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 (usend_msg.type) {
+ case UDEVD_UEVENT:
+ dbg("udevd message (UEVENT) received");
+ envbuf_size = size - offsetof(struct udevd_msg, envbuf);
+ dbg("envbuf_size=%i", envbuf_size);
+ msg = get_msg_from_envbuf(usend_msg.envbuf, envbuf_size);
+ if (msg == NULL)
+ return NULL;
+ return msg;
+ case UDEVD_STOP_EXEC_QUEUE:
+ dbg("udevd message (STOP_EXEC_QUEUE) received");
+ stop_exec_q = 1;
+ break;
+ case UDEVD_START_EXEC_QUEUE:
+ dbg("udevd message (START_EXEC_QUEUE) received");
+ stop_exec_q = 0;
+ exec_queue_manager();
+ break;
+ default:
+ dbg("unknown message type");
+ }
+ return NULL;
+}
- 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 uevent_msg *get_uevent_msg(void)
+{
+ struct 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_nl_sock, &buffer, sizeof(buffer), 0);
+ if (size < 0) {
+ if (errno != EINTR)
+ dbg("unable to receive udevd message");
+ 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=%i", 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) {
+ dbg("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) {
+ dbg("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) {
+ 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;
}
static void udev_done(int pid)
{
/* find msg associated with pid and delete it */
- struct hotplug_msg *msg;
+ struct uevent_msg *msg;
list_for_each_entry(msg, &running_list, node) {
if (msg->pid == pid) {
}
}
-static int init_udevsend_socket(void)
+static int init_udevd_socket(void)
{
struct sockaddr_un saddr;
socklen_t addrlen;
strcpy(&saddr.sun_path[1], UDEVD_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) {
+ 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);
+ close(udevd_sock);
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_nl_sock(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;
+
+ uevent_nl_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if (uevent_nl_sock == -1) {
+ dbg("error getting socket, %s", strerror(errno));
+ return -1;
+ }
+
+ retval = bind(uevent_nl_sock, (struct sockaddr *) &snl,
+ sizeof(struct sockaddr_nl));
+ if (retval < 0) {
+ dbg("bind failed, %s", strerror(errno));
+ close(uevent_nl_sock);
+ uevent_nl_sock = -1;
+ return -1;
+ }
return 0;
}
struct sigaction act;
fd_set readfds;
const char *udevd_expected_seqnum;
+ int uevent_nl_active = 0;
logging_init("udevd");
udev_init_config();
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
- if (init_udevsend_socket() < 0) {
+ if (init_uevent_nl_sock() < 0) {
+ dbg("uevent socket not available");
+ }
+
+ if (init_udevd_socket() < 0) {
if (errno == EADDRINUSE)
dbg("another udevd running, exit");
else
- dbg("error initialising udevsend socket: %s", strerror(errno));
+ dbg("error initialising udevd socket: %s", strerror(errno));
goto exit;
}
startup_time = info.uptime;
FD_ZERO(&readfds);
- FD_SET(udevsendsock, &readfds);
+ FD_SET(udevd_sock, &readfds);
+ if (uevent_nl_sock != -1)
+ FD_SET(uevent_nl_sock, &readfds);
FD_SET(pipefds[0], &readfds);
- maxsockplus = udevsendsock+1;
+ maxsockplus = udevd_sock+1;
while (1) {
- struct hotplug_msg *msg;
+ struct uevent_msg *msg;
fd_set workreadfds = readfds;
retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
continue;
}
- if (FD_ISSET(udevsendsock, &workreadfds)) {
- msg = get_udevsend_msg();
- if (msg)
+ if (FD_ISSET(udevd_sock, &workreadfds)) {
+ msg = get_udevd_msg();
+ if (msg) {
+ /* discard kernel messages if netlink is active */
+ if (uevent_nl_active && msg->seqnum != 0) {
+ dbg("skip uevent_helper message, netlink is active");
+ free(msg);
+ continue;
+ }
+ msg_queue_insert(msg);
+ }
+ }
+
+ if (FD_ISSET(uevent_nl_sock, &workreadfds)) {
+ msg = get_uevent_msg();
+ if (msg) {
msg_queue_insert(msg);
+ /* disable udevsend with first netlink message */
+ if (!uevent_nl_active) {
+ info("uevent_nl message received, disable uevent_helper messages");
+ uevent_nl_active = 1;
+ }
+ }
}
if (FD_ISSET(pipefds[0], &workreadfds))
}
run_exec_q = 0;
- exec_queue_manager();
+ if (!stop_exec_q)
+ exec_queue_manager();
}
}
~ianmdlvl / elogind.git / blobdiff